/*
* $Id$
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of ser, a free SIP server.
*
* ser is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* For a license to use the ser software under conditions
* other than those described here, or to purchase support for this
* software, please contact iptel.org by e-mail at the following addresses:
* info@iptel.org
*
* ser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* History:
* --------
* 2002-11-29 created by andrei
* 2002-12-11 added tcp_send (andrei)
* 2003-01-20 locking fixes, hashtables (andrei)
* 2003-02-20 s/lock_t/gen_lock_t/ to avoid a conflict on solaris (andrei)
* 2003-02-25 Nagle is disabled if -DDISABLE_NAGLE (andrei)
* 2003-03-29 SO_REUSEADDR before calling bind to allow
* server restart, Nagle set on the (hopefuly)
* correct socket (jiri)
* 2003-03-31 always try to find the corresponding tcp listen socket for
* a temp. socket and store in in *->bind_address: added
* find_tcp_si, modified tcpconn_connect (andrei)
* 2003-04-14 set sockopts to TOS low delay (andrei)
* 2003-06-30 moved tcp new connect checking & handling to
* handle_new_connect (andrei)
* 2003-07-09 tls_close called before closing the tcp connection (andrei)
* 2003-10-24 converted to the new socket_info lists (andrei)
* 2003-10-27 tcp port aliases support added (andrei)
* 2003-11-04 always lock before manipulating refcnt; sendchild
* does not inc refcnt by itself anymore (andrei)
* 2003-11-07 different unix sockets are used for fd passing
* to/from readers/writers (andrei)
* 2003-11-17 handle_new_connect & tcp_connect will close the
* new socket if tcpconn_new return 0 (e.g. out of mem) (andrei)
* 2003-11-28 tcp_blocking_write & tcp_blocking_connect added (andrei)
* 2004-11-08 dropped find_tcp_si and replaced with find_si (andrei)
* 2005-06-07 new tcp optimized code, supports epoll (LT), sigio + real time
* signals, poll & select (andrei)
* 2005-06-26 *bsd kqueue support (andrei)
* 2005-07-04 solaris /dev/poll support (andrei)
* 2005-07-08 tcp_max_connections, tcp_connection_lifetime, don't accept
* more connections if tcp_max_connections is exceeded (andrei)
* 2005-10-21 cleanup all the open connections on exit
* decrement the no. of open connections on timeout too (andrei) * 2006-01-30 queue send_fd request and execute them at the end of the
* poll loop (#ifdef) (andrei)
* process all children requests, before attempting to send
* them new stuff (fixes some deadlocks) (andrei)
* 2006-02-03 timers are run only once per s (andrei)
* tcp children fds can be non-blocking; send fds are queued on
* EAGAIN; lots of bug fixes (andrei)
* 2006-02-06 better tcp_max_connections checks, tcp_connections_no moved to
* shm (andrei)
* 2006-04-12 tcp_send() changed to use struct dest_info (andrei)
* 2006-11-02 switched to atomic ops for refcnt, locking improvements
* (andrei)
* 2006-11-04 switched to raw ticks (to fix conversion errors which could
* result in inf. lifetime) (andrei)
* 2007-07-25 tcpconn_connect can now bind the socket on a specified
* source addr/port (andrei)
* 2007-07-26 tcp_send() and tcpconn_get() can now use a specified source
* addr./port (andrei)
* 2007-08-23 getsockname() for INADDR_ANY(SI_IS_ANY) sockets (andrei)
* 2007-08-27 split init_sock_opt into a lightweight init_sock_opt_accept()
* used when accepting connections and init_sock_opt used for
* connect/ new sockets (andrei)
* 2007-11-22 always add the connection & clear the coresponding flags before
* io_watch_add-ing its fd - it's safer this way (andrei)
* 2007-11-26 improved tcp timers: switched to local_timer (andrei)
* 2007-11-27 added send fd cache and reader fd reuse (andrei)
* 2007-11-28 added support for TCP_DEFER_ACCEPT, KEEPALIVE, KEEPINTVL,
* KEEPCNT, QUICKACK, SYNCNT, LINGER2 (andrei)
* 2007-12-04 support for queueing write requests (andrei)
* 2007-12-12 destroy connection asap on wbuf. timeout (andrei)
* 2007-12-13 changed the refcnt and destroy scheme, now refcnt is 1 if
* linked into the hash tables (was 0) (andrei)
* 2007-12-21 support for pending connects (connections are added to the
* hash immediately and writes on them are buffered) (andrei)
* 2008-02-05 handle POLLRDHUP (if supported), POLLERR and
* POLLHUP (andrei)
* on write error check if there's still data in the socket
* read buffer and process it first (andrei)
* 2009-02-26 direct blacklist support (andrei)
* 2009-03-20 s/wq_timeout/send_timeout ; send_timeout is now in ticks
* (andrei)
* 2009-04-09 tcp ev and tcp stats macros added (andrei)
* 2009-09-15 support for force connection reuse and close after send
* send flags (andrei)
*/
#ifdef USE_TCP
#ifndef SHM_MEM
#error "shared memory support needed (add -DSHM_MEM to Makefile.defs)"
#endif
#define HANDLE_IO_INLINE
#include "io_wait.h" /* include first to make sure the needed features are
turned on (e.g. _GNU_SOURCE for POLLRDHUP) */
#include <sys/time.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
#ifdef HAVE_FILIO_H
#include <sys/filio.h> /* needed on solaris 2.x for FIONREAD */
#elif defined __OS_solaris
#define BSD_COMP /* needed on older solaris for FIONREAD */
#endif /* HAVE_FILIO_H / __OS_solaris */
#include <sys/ioctl.h> /* ioctl() used on write error */
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <sys/uio.h> /* writev*/
#include <netdb.h>
#include <stdlib.h> /*exit() */
#include <unistd.h>
#include <errno.h>
#include <string.h>
#ifdef HAVE_SELECT
#include <sys/select.h>
#endif
#include <sys/poll.h>
#include "ip_addr.h"
#include "pass_fd.h"
#include "tcp_conn.h"
#include "globals.h"
#include "pt.h"
#include "locking.h"
#include "mem/mem.h"
#include "mem/shm_mem.h"
#include "timer.h"
#include "sr_module.h"
#include "tcp_server.h"
#include "tcp_init.h"
#include "tcp_stats.h"
#include "tcp_ev.h"
#include "tsend.h"
#include "timer_ticks.h"
#include "local_timer.h"
#ifdef CORE_TLS
#include "tls/tls_server.h"
#define tls_loaded() 1
#else
#include "tls_hooks_init.h"
#include "tls_hooks.h"
#endif /* CORE_TLS*/
#ifdef USE_DST_BLACKLIST
#include "dst_blacklist.h"
#endif /* USE_DST_BLACKLIST */
#include "tcp_info.h"
#include "tcp_options.h"
#include "ut.h"
#include "cfg/cfg_struct.h"
#define local_malloc pkg_malloc
#define local_free pkg_free
#include <fcntl.h> /* must be included after io_wait.h if SIGIO_RT is used */
#ifdef NO_MSG_DONTWAIT
#ifndef MSG_DONTWAIT
/* should work inside tcp_main */
#define MSG_DONTWAIT 0
#endif
#endif /*NO_MSG_DONTWAIT */
#define TCP_PASS_NEW_CONNECTION_ON_DATA /* don't pass a new connection
immediately to a child, wait for
some data on it first */
#define TCP_LISTEN_BACKLOG 1024
#define SEND_FD_QUEUE /* queue send fd requests on EAGAIN, instead of sending
them immediately */
#define TCP_CHILD_NON_BLOCKING
#ifdef SEND_FD_QUEUE
#ifndef TCP_CHILD_NON_BLOCKING
#define TCP_CHILD_NON_BLOCKING
#endif
#define MAX_SEND_FD_QUEUE_SIZE tcp_main_max_fd_no
#define SEND_FD_QUEUE_SIZE 128 /* initial size */
#define MAX_SEND_FD_RETRIES 96 /* FIXME: not used for now */
#define SEND_FD_QUEUE_TIMEOUT MS_TO_TICKS(2000) /* 2 s */
#endif
/* minimum interval local_timer_run() is allowed to run, in ticks */
#define TCPCONN_TIMEOUT_MIN_RUN 1 /* once per tick */
#define TCPCONN_WAIT_TIMEOUT 1 /* 1 tick */
#ifdef TCP_ASYNC
static unsigned int* tcp_total_wq=0;
#endif
enum fd_types { F_NONE, F_SOCKINFO /* a tcp_listen fd */,
F_TCPCONN, F_TCPCHILD, F_PROC };
#ifdef TCP_FD_CACHE
#define TCP_FD_CACHE_SIZE 8
struct fd_cache_entry{
struct tcp_connection* con;
int id;
int fd;
};
static struct fd_cache_entry fd_cache[TCP_FD_CACHE_SIZE];
#endif /* TCP_FD_CACHE */
static int is_tcp_main=0;
enum poll_types tcp_poll_method=0; /* by default choose the best method */
int tcp_main_max_fd_no=0;
int tcp_max_connections=DEFAULT_TCP_MAX_CONNECTIONS;
static union sockaddr_union tcp_source_ipv4_addr; /* saved bind/srv v4 addr. */
static union sockaddr_union* tcp_source_ipv4=0;
#ifdef USE_IPV6
static union sockaddr_union tcp_source_ipv6_addr; /* saved bind/src v6 addr. */
static union sockaddr_union* tcp_source_ipv6=0;
#endif
static int* tcp_connections_no=0; /* current open connections */
/* connection hash table (after ip&port) , includes also aliases */
struct tcp_conn_alias** tcpconn_aliases_hash=0;
/* connection hash table (after connection id) */
struct tcp_connection** tcpconn_id_hash=0;
gen_lock_t* tcpconn_lock=0;
struct tcp_child* tcp_children;
static int* connection_id=0; /* unique for each connection, used for
quickly finding the corresponding connection
for a reply */
int unix_tcp_sock;
static int tcp_proto_no=-1; /* tcp protocol number as returned by
getprotobyname */
static io_wait_h io_h;
static struct local_timer tcp_main_ltimer;
static ticks_t tcp_main_prev_ticks;
static ticks_t tcpconn_main_timeout(ticks_t , struct timer_ln* , void* );
inline static int _tcpconn_add_alias_unsafe(struct tcp_connection* c, int port,
struct ip_addr* l_ip, int l_port,
int flags);
/* sets source address used when opening new sockets and no source is specified
* (by default the address is choosen by the kernel)
* Should be used only on init.
* returns -1 on error */
int tcp_set_src_addr(struct ip_addr* ip)
{
switch (ip->af){
case AF_INET:
ip_addr2su(&tcp_source_ipv4_addr, ip, 0);
tcp_source_ipv4=&tcp_source_ipv4_addr;
break;
#ifdef USE_IPV6
case AF_INET6:
ip_addr2su(&tcp_source_ipv6_addr, ip, 0);
tcp_source_ipv6=&tcp_source_ipv6_addr;
break;
#endif
default:
return -1;
}
return 0;
}
static inline int init_sock_keepalive(int s)
{
int optval;
#ifdef HAVE_SO_KEEPALIVE
if (cfg_get(tcp, tcp_cfg, keepalive)){
optval=1;
if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &optval,
sizeof(optval))<0){
LOG(L_WARN, "WARNING: init_sock_keepalive: failed to enable"
" SO_KEEPALIVE: %s\n", strerror(errno));
return -1;
}
}
#endif
#ifdef HAVE_TCP_KEEPINTVL
if ((optval=cfg_get(tcp, tcp_cfg, keepintvl))){
if (setsockopt(s, IPPROTO_TCP, TCP_KEEPINTVL, &optval,
sizeof(optval))<0){
LOG(L_WARN, "WARNING: init_sock_keepalive: failed to set"
" keepalive probes interval: %s\n", strerror(errno));
}
}
#endif
#ifdef HAVE_TCP_KEEPIDLE
if ((optval=cfg_get(tcp, tcp_cfg, keepidle))){
if (setsockopt(s, IPPROTO_TCP, TCP_KEEPIDLE, &optval,
sizeof(optval))<0){
LOG(L_WARN, "WARNING: init_sock_keepalive: failed to set"
" keepalive idle interval: %s\n", strerror(errno));
}
}
#endif
#ifdef HAVE_TCP_KEEPCNT
if ((optval=cfg_get(tcp, tcp_cfg, keepcnt))){
if (setsockopt(s, IPPROTO_TCP, TCP_KEEPCNT, &optval,
sizeof(optval))<0){
LOG(L_WARN, "WARNING: init_sock_keepalive: failed to set"
" maximum keepalive count: %s\n", strerror(errno));
}
}
#endif
return 0;
}
/* set all socket/fd options for new sockets (e.g. before connect):
* disable nagle, tos lowdelay, reuseaddr, non-blocking
*
* return -1 on error */
static int init_sock_opt(int s)
{
int flags;
int optval;
#ifdef DISABLE_NAGLE
flags=1;
if ( (tcp_proto_no!=-1) && (setsockopt(s, tcp_proto_no , TCP_NODELAY,
&flags, sizeof(flags))<0) ){
LOG(L_WARN, "WARNING: init_sock_opt: could not disable Nagle: %s\n",
strerror(errno));
}
#endif
/* tos*/
optval = tos;
if (setsockopt(s, IPPROTO_IP, IP_TOS, (void*)&optval,sizeof(optval)) ==-1){
LOG(L_WARN, "WARNING: init_sock_opt: setsockopt tos: %s\n",
strerror(errno));
/* continue since this is not critical */
}
#if !defined(TCP_DONT_REUSEADDR)
optval=1;
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(void*)&optval, sizeof(optval))==-1){
LOG(L_ERR, "ERROR: setsockopt SO_REUSEADDR %s\n",
strerror(errno));
/* continue, not critical */
}
#endif /* !TCP_DONT_REUSEADDR */
#ifdef HAVE_TCP_SYNCNT
if ((optval=cfg_get(tcp, tcp_cfg, syncnt))){
if (setsockopt(s, IPPROTO_TCP, TCP_SYNCNT, &optval,
sizeof(optval))<0){
LOG(L_WARN, "WARNING: init_sock_opt: failed to set"
" maximum SYN retr. count: %s\n", strerror(errno));
}
}
#endif
#ifdef HAVE_TCP_LINGER2
if ((optval=cfg_get(tcp, tcp_cfg, linger2))){
if (setsockopt(s, IPPROTO_TCP, TCP_LINGER2, &optval,
sizeof(optval))<0){
LOG(L_WARN, "WARNING: init_sock_opt: failed to set"
" maximum LINGER2 timeout: %s\n", strerror(errno));
}
}
#endif
#ifdef HAVE_TCP_QUICKACK
if (cfg_get(tcp, tcp_cfg, delayed_ack)){
optval=0; /* reset quick ack => delayed ack */
if (setsockopt(s, IPPROTO_TCP, TCP_QUICKACK, &optval,
sizeof(optval))<0){
LOG(L_WARN, "WARNING: init_sock_opt: failed to reset"
" TCP_QUICKACK: %s\n", strerror(errno));
}
}
#endif /* HAVE_TCP_QUICKACK */
init_sock_keepalive(s);
/* non-blocking */
flags=fcntl(s, F_GETFL);
if (flags==-1){
LOG(L_ERR, "ERROR: init_sock_opt: fnctl failed: (%d) %s\n",
errno, strerror(errno));
goto error;
}
if (fcntl(s, F_SETFL, flags|O_NONBLOCK)==-1){
LOG(L_ERR, "ERROR: init_sock_opt: fcntl: set non-blocking failed:"
" (%d) %s\n", errno, strerror(errno));
goto error;
}
return 0;
error:
return -1;
}
/* set all socket/fd options for "accepted" sockets
* only nonblocking is set since the rest is inherited from the
* "parent" (listening) socket
* Note: setting O_NONBLOCK is required on linux but it's not needed on
* BSD and possibly solaris (where the flag is inherited from the
* parent socket). However since there is no standard document
* requiring a specific behaviour in this case it's safer to always set
* it (at least for now) --andrei
* TODO: check on which OSes O_NONBLOCK is inherited and make this
* function a nop.
*
* return -1 on error */
static int init_sock_opt_accept(int s)
{
int flags;
/* non-blocking */
flags=fcntl(s, F_GETFL);
if (flags==-1){
LOG(L_ERR, "ERROR: init_sock_opt_accept: fnctl failed: (%d) %s\n",
errno, strerror(errno));
goto error;
}
if (fcntl(s, F_SETFL, flags|O_NONBLOCK)==-1){
LOG(L_ERR, "ERROR: init_sock_opt_accept: "
"fcntl: set non-blocking failed: (%d) %s\n",
errno, strerror(errno));
goto error;
}
return 0;
error:
return -1;
}
/* blocking connect on a non-blocking fd; it will timeout after
* tcp_connect_timeout
* if BLOCKING_USE_SELECT and HAVE_SELECT are defined it will internally
* use select() instead of poll (bad if fd > FD_SET_SIZE, poll is preferred)
*/
static int tcp_blocking_connect(int fd, int type,
const struct sockaddr *servaddr,
socklen_t addrlen)
{
int n;
#if defined(HAVE_SELECT) && defined(BLOCKING_USE_SELECT)
fd_set sel_set;
fd_set orig_set;
struct timeval timeout;
#else
struct pollfd pf;
#endif
int elapsed;
int to;
int ticks;
int err;
unsigned int err_len;
int poll_err;
poll_err=0;
to=cfg_get(tcp, tcp_cfg, connect_timeout_s);
ticks=get_ticks();
again:
n=connect(fd, servaddr, addrlen);
if (n==-1){
if (errno==EINTR){
elapsed=(get_ticks()-ticks)*TIMER_TICK;
if (elapsed<to) goto again;
else goto error_timeout;
}
if (errno!=EINPROGRESS && errno!=EALREADY){
goto error_errno;
}
}else goto end;
/* poll/select loop */
#if defined(HAVE_SELECT) && defined(BLOCKING_USE_SELECT)
FD_ZERO(&orig_set);
FD_SET(fd, &orig_set);
#else
pf.fd=fd;
pf.events=POLLOUT;
#endif
while(1){
elapsed=(get_ticks()-ticks)*TIMER_TICK;
if (elapsed>=to)
goto error_timeout;
#if defined(HAVE_SELECT) && defined(BLOCKING_USE_SELECT)
sel_set=orig_set;
timeout.tv_sec=to-elapsed;
timeout.tv_usec=0;
n=select(fd+1, 0, &sel_set, 0, &timeout);
#else
n=poll(&pf, 1, (to-elapsed)*1000);
#endif
if (n<0){
if (errno==EINTR) continue;
LOG(L_ERR, "ERROR: tcp_blocking_connect %s: poll/select failed:"
" (%d) %s\n",
su2a((union sockaddr_union*)servaddr, addrlen),
errno, strerror(errno));
goto error;
}else if (n==0) /* timeout */ continue;
#if defined(HAVE_SELECT) && defined(BLOCKING_USE_SELECT)
if (FD_ISSET(fd, &sel_set))
#else
if (pf.revents&(POLLERR|POLLHUP|POLLNVAL)){
LOG(L_ERR, "ERROR: tcp_blocking_connect %s: poll error: "
"flags %x\n",
su2a((union sockaddr_union*)servaddr, addrlen),
pf.revents);
poll_err=1;
}
#endif
{
err_len=sizeof(err);
getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &err_len);
if ((err==0) && (poll_err==0)) goto end;
if (err!=EINPROGRESS && err!=EALREADY){
LOG(L_ERR, "ERROR: tcp_blocking_connect %s: SO_ERROR (%d) "
"%s\n",
su2a((union sockaddr_union*)servaddr, addrlen),
err, strerror(err));
errno=err;
goto error_errno;
}
}
}
error_errno:
switch(errno){
case ENETUNREACH:
case EHOSTUNREACH:
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT, type,
(union sockaddr_union*)servaddr, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_UNREACHABLE(errno, 0, 0,
(union sockaddr_union*)servaddr, type);
break;
case ETIMEDOUT:
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT, type,
(union sockaddr_union*)servaddr, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_TIMEOUT(errno, 0, 0,
(union sockaddr_union*)servaddr, type);
break;
case ECONNREFUSED:
case ECONNRESET:
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT, type,
(union sockaddr_union*)servaddr, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_RST(errno, 0, 0,
(union sockaddr_union*)servaddr, type);
break;
case EAGAIN: /* not posix, but supported on linux and bsd */
TCP_EV_CONNECT_NO_MORE_PORTS(errno, 0, 0,
(union sockaddr_union*)servaddr, type);
break;
default:
TCP_EV_CONNECT_ERR(errno, 0, 0,
(union sockaddr_union*)servaddr, type);
}
LOG(L_ERR, "ERROR: tcp_blocking_connect %s: (%d) %s\n",
su2a((union sockaddr_union*)servaddr, addrlen),
errno, strerror(errno));
goto error;
error_timeout:
/* timeout */
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT, type,
(union sockaddr_union*)servaddr, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_TIMEOUT(0, 0, 0, (union sockaddr_union*)servaddr, type);
LOG(L_ERR, "ERROR: tcp_blocking_connect %s: timeout %d s elapsed "
"from %d s\n", su2a((union sockaddr_union*)servaddr, addrlen),
elapsed, cfg_get(tcp, tcp_cfg, connect_timeout_s));
error:
TCP_STATS_CONNECT_FAILED();
return -1;
end:
return 0;
}
inline static int _tcpconn_write_nb(int fd, struct tcp_connection* c,
char* buf, int len);
#ifdef TCP_ASYNC
/* unsafe version */
#define _wbufq_empty(con) ((con)->wbuf_q.first==0)
/* unsafe version */
#define _wbufq_non_empty(con) ((con)->wbuf_q.first!=0)
/* unsafe version, call while holding the connection write lock */
inline static int _wbufq_add(struct tcp_connection* c, char* data,
unsigned int size)
{
struct tcp_wbuffer_queue* q;
struct tcp_wbuffer* wb;
unsigned int last_free;
unsigned int wb_size;
unsigned int crt_size;
ticks_t t;
q=&c->wbuf_q;
t=get_ticks_raw();
if (unlikely( ((q->queued+size)>cfg_get(tcp, tcp_cfg, tcpconn_wq_max)) ||
((*tcp_total_wq+size)>cfg_get(tcp, tcp_cfg, tcp_wq_max)) ||
(q->first &&
TICKS_LT(q->wr_timeout, t)) )){
LOG(L_ERR, "ERROR: wbufq_add(%d bytes): write queue full or timeout "
" (%d, total %d, last write %d s ago)\n",
size, q->queued, *tcp_total_wq,
TICKS_TO_S(t-q->wr_timeout-
cfg_get(tcp, tcp_cfg, send_timeout)));
if (q->first && TICKS_LT(q->wr_timeout, t)){
if (unlikely(c->state==S_CONN_CONNECT)){
#ifdef USE_DST_BLACKLIST
if (likely(cfg_get(core, core_cfg, use_dst_blacklist))){
DBG("blacklisting, state=%d\n", c->state);
dst_blacklist_su( BLST_ERR_CONNECT, c->rcv.proto,
&c->rcv.src_su, 0);
}
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_TIMEOUT(0, TCP_LADDR(c), TCP_LPORT(c),
TCP_PSU(c), TCP_PROTO(c));
TCP_STATS_CONNECT_FAILED();
}else{
#ifdef USE_DST_BLACKLIST
if (likely(cfg_get(core, core_cfg, use_dst_blacklist))){
DBG("blacklisting, state=%d\n", c->state);
dst_blacklist_su( BLST_ERR_SEND, c->rcv.proto,
&c->rcv.src_su, 0);
}
#endif /* USE_DST_BLACKLIST */
TCP_EV_SEND_TIMEOUT(0, &c->rcv);
TCP_STATS_SEND_TIMEOUT();
}
}else{
/* if it's not a timeout => queue full */
TCP_EV_SENDQ_FULL(0, &c->rcv);
TCP_STATS_SENDQ_FULL();
}
goto error;
}
if (unlikely(q->last==0)){
wb_size=MAX_unsigned(cfg_get(tcp, tcp_cfg, wq_blk_size), size);
wb=shm_malloc(sizeof(*wb)+wb_size-1);
if (unlikely(wb==0))
goto error;
wb->b_size=wb_size;
wb->next=0;
q->last=wb;
q->first=wb;
q->last_used=0;
q->offset=0;
q->wr_timeout=get_ticks_raw()+
((c->state==S_CONN_CONNECT)?
S_TO_TICKS(cfg_get(tcp, tcp_cfg, connect_timeout_s)):
cfg_get(tcp, tcp_cfg, send_timeout));
}else{
wb=q->last;
}
while(size){
last_free=wb->b_size-q->last_used;
if (last_free==0){
wb_size=MAX_unsigned(cfg_get(tcp, tcp_cfg, wq_blk_size), size);
wb=shm_malloc(sizeof(*wb)+wb_size-1);
if (unlikely(wb==0))
goto error;
wb->b_size=wb_size;
wb->next=0;
q->last->next=wb;
q->last=wb;
q->last_used=0;
last_free=wb->b_size;
}
crt_size=MIN_unsigned(last_free, size);
memcpy(wb->buf+q->last_used, data, crt_size);
q->last_used+=crt_size;
size-=crt_size;
data+=crt_size;
q->queued+=crt_size;
atomic_add_int((int*)tcp_total_wq, crt_size);
}
return 0;
error:
return -1;
}
/* unsafe version, call while holding the connection write lock
* inserts data at the beginning, it ignores the max queue size checks and
* the timeout (use sparingly)
* Note: it should never be called on a write buffer after wbufq_run() */
inline static int _wbufq_insert(struct tcp_connection* c, char* data,
unsigned int size)
{
struct tcp_wbuffer_queue* q;
struct tcp_wbuffer* wb;
q=&c->wbuf_q;
if (likely(q->first==0)) /* if empty, use wbufq_add */
return _wbufq_add(c, data, size);
if (unlikely((*tcp_total_wq+size)>cfg_get(tcp, tcp_cfg, tcp_wq_max))){
LOG(L_ERR, "ERROR: wbufq_insert(%d bytes): write queue full"
" (%d, total %d, last write %d s ago)\n",
size, q->queued, *tcp_total_wq,
TICKS_TO_S(get_ticks_raw()-q->wr_timeout-
cfg_get(tcp, tcp_cfg, send_timeout)));
goto error;
}
if (unlikely(q->offset)){
LOG(L_CRIT, "BUG: wbufq_insert: non-null offset %d (bad call, should"
"never be called after the wbufq_run())\n", q->offset);
goto error;
}
if ((q->first==q->last) && ((q->last->b_size-q->last_used)>=size)){
/* one block with enough space in it for size bytes */
memmove(q->first->buf+size, q->first->buf, size);
memcpy(q->first->buf, data, size);
q->last_used+=size;
}else{
/* create a size bytes block directly */
wb=shm_malloc(sizeof(*wb)+size-1);
if (unlikely(wb==0))
goto error;
wb->b_size=size;
/* insert it */
wb->next=q->first;
q->first=wb;
memcpy(wb->buf, data, size);
}
q->queued+=size;
atomic_add_int((int*)tcp_total_wq, size);
return 0;
error:
return -1;
}
/* unsafe version, call while holding the connection write lock */
inline static void _wbufq_destroy( struct tcp_wbuffer_queue* q)
{
struct tcp_wbuffer* wb;
struct tcp_wbuffer* next_wb;
int unqueued;
unqueued=0;
if (likely(q->first)){
wb=q->first;
do{
next_wb=wb->next;
unqueued+=(wb==q->last)?q->last_used:wb->b_size;
if (wb==q->first)
unqueued-=q->offset;
shm_free(wb);
wb=next_wb;
}while(wb);
}
memset(q, 0, sizeof(*q));
atomic_add_int((int*)tcp_total_wq, -unqueued);
}
/* tries to empty the queue (safe version, c->write_lock must not be hold)
* returns -1 on error, bytes written on success (>=0)
* if the whole queue is emptied => sets *empty*/
inline static int wbufq_run(int fd, struct tcp_connection* c, int* empty)
{
struct tcp_wbuffer_queue* q;
struct tcp_wbuffer* wb;
int n;
int ret;
int block_size;
char* buf;
*empty=0;
ret=0;
lock_get(&c->write_lock);
q=&c->wbuf_q;
while(q->first){
block_size=((q->first==q->last)?q->last_used:q->first->b_size)-
q->offset;
buf=q->first->buf+q->offset;
n=_tcpconn_write_nb(fd, c, buf, block_size);
if (likely(n>0)){
ret+=n;
if (likely(n==block_size)){
wb=q->first;
q->first=q->first->next;
shm_free(wb);
q->offset=0;
q->queued-=block_size;
atomic_add_int((int*)tcp_total_wq, -block_size);
}else{
q->offset+=n;
q->queued-=n;
atomic_add_int((int*)tcp_total_wq, -n);
break;
}
}else{
if (n<0){
/* EINTR is handled inside _tcpconn_write_nb */
if (!(errno==EAGAIN || errno==EWOULDBLOCK)){
if (unlikely(c->state==S_CONN_CONNECT)){
switch(errno){
case ENETUNREACH:
case EHOSTUNREACH: /* not posix for send() */
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT,
c->rcv.proto,
&c->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_UNREACHABLE(errno, TCP_LADDR(c),
TCP_LPORT(c), TCP_PSU(c),
TCP_PROTO(c));
break;
case ECONNREFUSED:
case ECONNRESET:
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT,
c->rcv.proto,
&c->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_RST(0, TCP_LADDR(c),
TCP_LPORT(c), TCP_PSU(c),
TCP_PROTO(c));
break;
default:
TCP_EV_CONNECT_ERR(errno, TCP_LADDR(c),
TCP_LPORT(c), TCP_PSU(c),
TCP_PROTO(c));
}
TCP_STATS_CONNECT_FAILED();
}else{
switch(errno){
case ECONNREFUSED:
case ECONNRESET:
TCP_STATS_CON_RESET();
/* no break */
case ENETUNREACH:
case EHOSTUNREACH: /* not posix for send() */
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_SEND,
c->rcv.proto,
&c->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
break;
}
}
ret=-1;
LOG(L_ERR, "ERROR: wbuf_runq: %s [%d]\n",
strerror(errno), errno);
}
}
break;
}
}
if (likely(q->first==0)){
q->last=0;
q->last_used=0;
q->offset=0;
*empty=1;
}
lock_release(&c->write_lock);
if (likely(ret>0)){
q->wr_timeout=get_ticks_raw()+cfg_get(tcp, tcp_cfg, send_timeout);
if (unlikely(c->state==S_CONN_CONNECT || c->state==S_CONN_ACCEPT)){
TCP_STATS_ESTABLISHED(c->state);
c->state=S_CONN_OK;
}
}
return ret;
}
#endif /* TCP_ASYNC */
#if 0
/* blocking write even on non-blocking sockets
* if TCP_TIMEOUT will return with error */
static int tcp_blocking_write(struct tcp_connection* c, int fd, char* buf,
unsigned int len)
{
int n;
fd_set sel_set;
struct timeval timeout;
int ticks;
int initial_len;
initial_len=len;
again:
n=send(fd, buf, len,
#ifdef HAVE_MSG_NOSIGNAL
MSG_NOSIGNAL
#else
0
#endif
);
if (n<0){
if (errno==EINTR) goto again;
else if (errno!=EAGAIN && errno!=EWOULDBLOCK){
LOG(L_ERR, "tcp_blocking_write: failed to send: (%d) %s\n",
errno, strerror(errno));
TCP_EV_SEND_TIMEOUT(errno, &c->rcv);
TCP_STATS_SEND_TIMEOUT();
goto error;
}
}else if (n<len){
/* partial write */
buf+=n;
len-=n;
}else{
/* success: full write */
goto end;
}
while(1){
FD_ZERO(&sel_set);
FD_SET(fd, &sel_set);
timeout.tv_sec=tcp_send_timeout;
timeout.tv_usec=0;
ticks=get_ticks();
n=select(fd+1, 0, &sel_set, 0, &timeout);
if (n<0){
if (errno==EINTR) continue; /* signal, ignore */
LOG(L_ERR, "ERROR: tcp_blocking_write: select failed: "
" (%d) %s\n", errno, strerror(errno));
goto error;
}else if (n==0){
/* timeout */
if (get_ticks()-ticks>=tcp_send_timeout){
LOG(L_ERR, "ERROR: tcp_blocking_write: send timeout (%d)\n",
tcp_send_timeout);
goto error;
}
continue;
}
if (FD_ISSET(fd, &sel_set)){
/* we can write again */
goto again;
}
}
error:
return -1;
end:
return initial_len;
}
#endif
struct tcp_connection* tcpconn_new(int sock, union sockaddr_union* su,
union sockaddr_union* local_addr,
struct socket_info* ba, int type,
int state)
{
struct tcp_connection *c;
int rd_b_size;
rd_b_size=cfg_get(tcp, tcp_cfg, rd_buf_size);
c=shm_malloc(sizeof(struct tcp_connection) + rd_b_size);
if (c==0){
LOG(L_ERR, "ERROR: tcpconn_new: mem. allocation failure\n");
goto error;
}
memset(c, 0, sizeof(struct tcp_connection)); /* zero init (skip rd buf)*/
c->s=sock;
c->fd=-1; /* not initialized */
if (lock_init(&c->write_lock)==0){
LOG(L_ERR, "ERROR: tcpconn_new: init lock failed\n");
goto error;
}
c->rcv.src_su=*su;
atomic_set(&c->refcnt, 0);
local_timer_init(&c->timer, tcpconn_main_timeout, c, 0);
su2ip_addr(&c->rcv.src_ip, su);
c->rcv.src_port=su_getport(su);
c->rcv.bind_address=ba;
if (likely(local_addr)){
su2ip_addr(&c->rcv.dst_ip, local_addr);
c->rcv.dst_port=su_getport(local_addr);
}else if (ba){
c->rcv.dst_ip=ba->address;
c->rcv.dst_port=ba->port_no;
}
print_ip("tcpconn_new: new tcp connection: ", &c->rcv.src_ip, "\n");
DBG( "tcpconn_new: on port %d, type %d\n", c->rcv.src_port, type);
init_tcp_req(&c->req, (char*)c+sizeof(struct tcp_connection), rd_b_size);
c->id=(*connection_id)++;
c->rcv.proto_reserved1=0; /* this will be filled before receive_message*/
c->rcv.proto_reserved2=0;
c->state=state;
c->extra_data=0;
#ifdef USE_TLS
if (type==PROTO_TLS){
if (tls_tcpconn_init(c, sock)==-1) goto error;
}else
#endif /* USE_TLS*/
{
c->type=PROTO_TCP;
c->rcv.proto=PROTO_TCP;
c->timeout=get_ticks_raw()+cfg_get(tcp, tcp_cfg, con_lifetime);
}
return c;
error:
if (c) shm_free(c);
return 0;
}
/* do the actual connect, set sock. options a.s.o
* returns socket on success, -1 on error
* sets also *res_local_addr, res_si and state (S_CONN_CONNECT for an
* unfinished connect and S_CONN_OK for a finished one)*/
inline static int tcp_do_connect( union sockaddr_union* server,
union sockaddr_union* from,
int type,
union sockaddr_union* res_local_addr,
struct socket_info** res_si,
enum tcp_conn_states *state
)
{
int s;
union sockaddr_union my_name;
socklen_t my_name_len;
struct ip_addr ip;
#ifdef TCP_ASYNC
int n;
#endif /* TCP_ASYNC */
s=socket(AF2PF(server->s.sa_family), SOCK_STREAM, 0);
if (unlikely(s==-1)){
LOG(L_ERR, "ERROR: tcp_do_connect %s: socket: (%d) %s\n",
su2a(server, sizeof(*server)), errno, strerror(errno));
goto error;
}
if (init_sock_opt(s)<0){
LOG(L_ERR, "ERROR: tcp_do_connect %s: init_sock_opt failed\n",
su2a(server, sizeof(*server)));
goto error;
}
if (unlikely(from && bind(s, &from->s, sockaddru_len(*from)) != 0)){
LOG(L_WARN, "WARNING: tcp_do_connect: binding to source address"
" %s failed: %s [%d]\n", su2a(from, sizeof(*from)),
strerror(errno), errno);
}
*state=S_CONN_OK;
#ifdef TCP_ASYNC
if (likely(cfg_get(tcp, tcp_cfg, async))){
again:
n=connect(s, &server->s, sockaddru_len(*server));
if (likely(n==-1)){ /*non-blocking => most probable EINPROGRESS*/
if (likely(errno==EINPROGRESS))
*state=S_CONN_CONNECT;
else if (errno==EINTR) goto again;
else if (errno!=EALREADY){
switch(errno){
case ENETUNREACH:
case EHOSTUNREACH:
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT, type, server,0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_UNREACHABLE(errno, 0, 0, server, type);
break;
case ETIMEDOUT:
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT, type, server,0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_TIMEOUT(errno, 0, 0, server, type);
break;
case ECONNREFUSED:
case ECONNRESET:
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT, type, server,0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_RST(errno, 0, 0, server, type);
break;
case EAGAIN:/* not posix, but supported on linux and bsd */
TCP_EV_CONNECT_NO_MORE_PORTS(errno, 0, 0, server,type);
break;
default:
TCP_EV_CONNECT_ERR(errno, 0, 0, server, type);
}
TCP_STATS_CONNECT_FAILED();
LOG(L_ERR, "ERROR: tcp_do_connect: connect %s: (%d) %s\n",
su2a(server, sizeof(*server)),
errno, strerror(errno));
goto error;
}
}
}else{
#endif /* TCP_ASYNC */
if (tcp_blocking_connect(s, type, &server->s,
sockaddru_len(*server))<0){
LOG(L_ERR, "ERROR: tcp_do_connect: tcp_blocking_connect %s"
" failed\n", su2a(server, sizeof(*server)));
goto error;
}
#ifdef TCP_ASYNC
}
#endif /* TCP_ASYNC */
if (from){
su2ip_addr(&ip, from);
if (!ip_addr_any(&ip))
/* we already know the source ip, skip the sys. call */
goto find_socket;
}
my_name_len=sizeof(my_name);
if (unlikely(getsockname(s, &my_name.s, &my_name_len)!=0)){
LOG(L_ERR, "ERROR: tcp_do_connect: getsockname failed: %s(%d)\n",
strerror(errno), errno);
*res_si=0;
goto error;
}
from=&my_name; /* update from with the real "from" address */
su2ip_addr(&ip, &my_name);
find_socket:
#ifdef USE_TLS
if (unlikely(type==PROTO_TLS))
*res_si=find_si(&ip, 0, PROTO_TLS);
else
#endif
*res_si=find_si(&ip, 0, PROTO_TCP);
if (unlikely(*res_si==0)){
LOG(L_WARN, "WARNING: tcp_do_connect %s: could not find corresponding"
" listening socket for %s, using default...\n",
su2a(server, sizeof(*server)), ip_addr2a(&ip));
if (server->s.sa_family==AF_INET) *res_si=sendipv4_tcp;
#ifdef USE_IPV6
else *res_si=sendipv6_tcp;
#endif
}
*res_local_addr=*from;
return s;
error:
if (s!=-1) close(s);
return -1;
}
struct tcp_connection* tcpconn_connect( union sockaddr_union* server,
union sockaddr_union* from,
int type)
{
int s;
struct socket_info* si;
union sockaddr_union my_name;
struct tcp_connection* con;
enum tcp_conn_states state;
s=-1;
if (*tcp_connections_no >= cfg_get(tcp, tcp_cfg, max_connections)){
LOG(L_ERR, "ERROR: tcpconn_connect: maximum number of connections"
" exceeded (%d/%d)\n",
*tcp_connections_no,
cfg_get(tcp, tcp_cfg, max_connections));
goto error;
}
s=tcp_do_connect(server, from, type, &my_name, &si, &state);
if (s==-1){
LOG(L_ERR, "ERROR: tcp_do_connect %s: failed (%d) %s\n",
su2a(server, sizeof(*server)), errno, strerror(errno));
goto error;
}
con=tcpconn_new(s, server, &my_name, si, type, state);
if (con==0){
LOG(L_ERR, "ERROR: tcp_connect %s: tcpconn_new failed, closing the "
" socket\n", su2a(server, sizeof(*server)));
goto error;
}
return con;
/*FIXME: set sock idx! */
error:
if (s!=-1) close(s); /* close the opened socket */
return 0;
}
#ifdef TCP_CONNECT_WAIT
int tcpconn_finish_connect( struct tcp_connection* c,
union sockaddr_union* from)
{
int s;
int r;
union sockaddr_union local_addr;
struct socket_info* si;
enum tcp_conn_states state;
struct tcp_conn_alias* a;
int new_conn_alias_flags;
s=tcp_do_connect(&c->rcv.src_su, from, c->type, &local_addr, &si, &state);
if (unlikely(s==-1)){
LOG(L_ERR, "ERROR: tcpconn_finish_connect %s: tcp_do_connect for %p"
" failed\n", su2a(&c->rcv.src_su, sizeof(c->rcv.src_su)),
c);
return -1;
}
c->rcv.bind_address=si;
su2ip_addr(&c->rcv.dst_ip, &local_addr);
c->rcv.dst_port=su_getport(&local_addr);
/* update aliases if needed */
if (likely(from==0)){
new_conn_alias_flags=cfg_get(tcp, tcp_cfg, new_conn_alias_flags);
/* add aliases */
TCPCONN_LOCK;
_tcpconn_add_alias_unsafe(c, c->rcv.src_port, &c->rcv.dst_ip, 0,
new_conn_alias_flags);
_tcpconn_add_alias_unsafe(c, c->rcv.src_port, &c->rcv.dst_ip,
c->rcv.dst_port, new_conn_alias_flags);
TCPCONN_UNLOCK;
}else if (su_cmp(from, &local_addr)!=1){
new_conn_alias_flags=cfg_get(tcp, tcp_cfg, new_conn_alias_flags);
TCPCONN_LOCK;
/* remove all the aliases except the first one and re-add them
* (there shouldn't be more then the 3 default aliases at this
* stage) */
for (r=1; r<c->aliases; r++){
a=&c->con_aliases[r];
tcpconn_listrm(tcpconn_aliases_hash[a->hash], a, next, prev);
}
c->aliases=1;
/* add the local_ip:0 and local_ip:local_port aliases */
_tcpconn_add_alias_unsafe(c, c->rcv.src_port, &c->rcv.dst_ip,
0, new_conn_alias_flags);
_tcpconn_add_alias_unsafe(c, c->rcv.src_port, &c->rcv.dst_ip,
c->rcv.dst_port, new_conn_alias_flags);
TCPCONN_UNLOCK;
}
return s;
}
#endif /* TCP_CONNECT_WAIT */
/* adds a tcp connection to the tcpconn hashes
* Note: it's called _only_ from the tcp_main process */
inline static struct tcp_connection* tcpconn_add(struct tcp_connection *c)
{
struct ip_addr zero_ip;
int new_conn_alias_flags;
if (likely(c)){
ip_addr_mk_any(c->rcv.src_ip.af, &zero_ip);
c->id_hash=tcp_id_hash(c->id);
c->aliases=0;
new_conn_alias_flags=cfg_get(tcp, tcp_cfg, new_conn_alias_flags);
TCPCONN_LOCK;
c->flags|=F_CONN_HASHED;
/* add it at the begining of the list*/
tcpconn_listadd(tcpconn_id_hash[c->id_hash], c, id_next, id_prev);
/* set the aliases */
/* first alias is for (peer_ip, peer_port, 0 ,0) -- for finding
* any connection to peer_ip, peer_port
* the second alias is for (peer_ip, peer_port, local_addr, 0) -- for
* finding any conenction to peer_ip, peer_port from local_addr
* the third alias is for (peer_ip, peer_port, local_addr, local_port)
* -- for finding if a fully specified connection exists */
_tcpconn_add_alias_unsafe(c, c->rcv.src_port, &zero_ip, 0,
new_conn_alias_flags);
if (likely(c->rcv.dst_ip.af && ! ip_addr_any(&c->rcv.dst_ip))){
_tcpconn_add_alias_unsafe(c, c->rcv.src_port, &c->rcv.dst_ip, 0,
new_conn_alias_flags);
_tcpconn_add_alias_unsafe(c, c->rcv.src_port, &c->rcv.dst_ip,
c->rcv.dst_port, new_conn_alias_flags);
}
/* ignore add_alias errors, there are some valid cases when one
* of the add_alias would fail (e.g. first add_alias for 2 connections
* with the same destination but different src. ip*/
TCPCONN_UNLOCK;
DBG("tcpconn_add: hashes: %d:%d:%d, %d\n",
c->con_aliases[0].hash,
c->con_aliases[1].hash,
c->con_aliases[2].hash,
c->id_hash);
return c;
}else{
LOG(L_CRIT, "tcpconn_add: BUG: null connection pointer\n");
return 0;
}
}
static inline void _tcpconn_detach(struct tcp_connection *c)
{
int r;
tcpconn_listrm(tcpconn_id_hash[c->id_hash], c, id_next, id_prev);
/* remove all the aliases */
for (r=0; r<c->aliases; r++)
tcpconn_listrm(tcpconn_aliases_hash[c->con_aliases[r].hash],
&c->con_aliases[r], next, prev);
}
static inline void _tcpconn_free(struct tcp_connection* c)
{
#ifdef TCP_ASYNC
if (unlikely(_wbufq_non_empty(c)))
_wbufq_destroy(&c->wbuf_q);
#endif
lock_destroy(&c->write_lock);
#ifdef USE_TLS
if (unlikely(c->type==PROTO_TLS)) tls_tcpconn_clean(c);
#endif
shm_free(c);
}
/* unsafe tcpconn_rm version (nolocks) */
void _tcpconn_rm(struct tcp_connection* c)
{
_tcpconn_detach(c);
_tcpconn_free(c);
}
void tcpconn_rm(struct tcp_connection* c)
{
int r;
TCPCONN_LOCK;
tcpconn_listrm(tcpconn_id_hash[c->id_hash], c, id_next, id_prev);
/* remove all the aliases */
for (r=0; r<c->aliases; r++)
tcpconn_listrm(tcpconn_aliases_hash[c->con_aliases[r].hash],
&c->con_aliases[r], next, prev);
TCPCONN_UNLOCK;
lock_destroy(&c->write_lock);
#ifdef USE_TLS
if ((c->type==PROTO_TLS)&&(c->extra_data)) tls_tcpconn_clean(c);
#endif
shm_free(c);
}
/* finds a connection, if id=0 uses the ip addr, port, local_ip and local port
* (host byte order) and tries to find the connection that matches all of
* them. Wild cards can be used for local_ip and local_port (a 0 filled
* ip address and/or a 0 local port).
* WARNING: unprotected (locks) use tcpconn_get unless you really
* know what you are doing */
struct tcp_connection* _tcpconn_find(int id, struct ip_addr* ip, int port,
struct ip_addr* l_ip, int l_port)
{
struct tcp_connection *c;
struct tcp_conn_alias* a;
unsigned hash;
int is_local_ip_any;
#ifdef EXTRA_DEBUG
DBG("tcpconn_find: %d port %d\n",id, port);
if (ip) print_ip("tcpconn_find: ip ", ip, "\n");
#endif
if (likely(id)){
hash=tcp_id_hash(id);
for (c=tcpconn_id_hash[hash]; c; c=c->id_next){
#ifdef EXTRA_DEBUG
DBG("c=%p, c->id=%d, port=%d\n",c, c->id, c->rcv.src_port);
print_ip("ip=", &c->rcv.src_ip, "\n");
#endif
if ((id==c->id)&&(c->state!=S_CONN_BAD)) return c;
}
}else if (likely(ip)){
hash=tcp_addr_hash(ip, port, l_ip, l_port);
is_local_ip_any=ip_addr_any(l_ip);
for (a=tcpconn_aliases_hash[hash]; a; a=a->next){
#ifdef EXTRA_DEBUG
DBG("a=%p, c=%p, c->id=%d, alias port= %d port=%d\n", a, a->parent,
a->parent->id, a->port, a->parent->rcv.src_port);
print_ip("ip=",&a->parent->rcv.src_ip,"\n");
#endif
if ( (a->parent->state!=S_CONN_BAD) && (port==a->port) &&
((l_port==0) || (l_port==a->parent->rcv.dst_port)) &&
(ip_addr_cmp(ip, &a->parent->rcv.src_ip)) &&
(is_local_ip_any ||
ip_addr_cmp(l_ip, &a->parent->rcv.dst_ip))
)
return a->parent;
}
}
return 0;
}
/* _tcpconn_find with locks and timeout
* local_addr contains the desired local ip:port. If null any local address
* will be used. IN*ADDR_ANY or 0 port are wild cards.
*/
struct tcp_connection* tcpconn_get(int id, struct ip_addr* ip, int port,
union sockaddr_union* local_addr,
ticks_t timeout)
{
struct tcp_connection* c;
struct ip_addr local_ip;
int local_port;
local_port=0;
if (likely(ip)){
if (unlikely(local_addr)){
su2ip_addr(&local_ip, local_addr);
local_port=su_getport(local_addr);
}else{
ip_addr_mk_any(ip->af, &local_ip);
local_port=0;
}
}
TCPCONN_LOCK;
c=_tcpconn_find(id, ip, port, &local_ip, local_port);
if (likely(c)){
atomic_inc(&c->refcnt);
/* update the timeout only if the connection is not handled
* by a tcp reader (the tcp reader process uses c->timeout for
* its own internal timeout and c->timeout will be overwritten
* anyway on return to tcp_main) */
if (likely(c->reader_pid==0))
c->timeout=get_ticks_raw()+timeout;
}
TCPCONN_UNLOCK;
return c;
}
/* add c->dst:port, local_addr as an alias for the "id" connection,
* flags: TCP_ALIAS_FORCE_ADD - add an alias even if a previous one exists
* TCP_ALIAS_REPLACE - if a prev. alias exists, replace it with the
* new one
* returns 0 on success, <0 on failure ( -1 - null c, -2 too many aliases,
* -3 alias already present and pointing to another connection)
* WARNING: must be called with TCPCONN_LOCK held */
inline static int _tcpconn_add_alias_unsafe(struct tcp_connection* c, int port,
struct ip_addr* l_ip, int l_port,
int flags)
{
unsigned hash;
struct tcp_conn_alias* a;
struct tcp_conn_alias* nxt;
struct tcp_connection* p;
int is_local_ip_any;
int i;
int r;
a=0;
is_local_ip_any=ip_addr_any(l_ip);
if (likely(c)){
hash=tcp_addr_hash(&c->rcv.src_ip, port, l_ip, l_port);
/* search the aliases for an already existing one */
for (a=tcpconn_aliases_hash[hash], nxt=0; a; a=nxt){
nxt=a->next;
if ( (a->parent->state!=S_CONN_BAD) && (port==a->port) &&
( (l_port==0) || (l_port==a->parent->rcv.dst_port)) &&
(ip_addr_cmp(&c->rcv.src_ip, &a->parent->rcv.src_ip)) &&
( is_local_ip_any ||
ip_addr_cmp(&a->parent->rcv.dst_ip, l_ip))
){
/* found */
if (unlikely(a->parent!=c)){
if (flags & TCP_ALIAS_FORCE_ADD)
/* still have to walk the whole list to check if
* the alias was not already added */
continue;
else if (flags & TCP_ALIAS_REPLACE){
/* remove the alias =>
* remove the current alias and all the following
* ones from the corresponding connection, shift the
* connection aliases array and re-add the other
* aliases (!= current one) */
p=a->parent;
for (i=0; (i<p->aliases) && (&(p->con_aliases[i])!=a);
i++);
if (unlikely(i==p->aliases)){
LOG(L_CRIT, "BUG: _tcpconn_add_alias_unsafe: "
" alias %p not found in con %p (id %d)\n",
a, p, p->id);
goto error_not_found;
}
for (r=i; r<p->aliases; r++){
tcpconn_listrm(
tcpconn_aliases_hash[p->con_aliases[r].hash],
&p->con_aliases[r], next, prev);
}
if (likely((i+1)<p->aliases)){
memmove(&p->con_aliases[i], &p->con_aliases[i+1],
(p->aliases-i-1)*
sizeof(p->con_aliases[0]));
}
p->aliases--;
/* re-add the remaining aliases */
for (r=i; r<p->aliases; r++){
tcpconn_listadd(
tcpconn_aliases_hash[p->con_aliases[r].hash],
&p->con_aliases[r], next, prev);
}
}else
goto error_sec;
}else goto ok;
}
}
if (unlikely(c->aliases>=TCP_CON_MAX_ALIASES)) goto error_aliases;
c->con_aliases[c->aliases].parent=c;
c->con_aliases[c->aliases].port=port;
c->con_aliases[c->aliases].hash=hash;
tcpconn_listadd(tcpconn_aliases_hash[hash],
&c->con_aliases[c->aliases], next, prev);
c->aliases++;
}else goto error_not_found;
ok:
#ifdef EXTRA_DEBUG
if (a) DBG("_tcpconn_add_alias_unsafe: alias already present\n");
else DBG("_tcpconn_add_alias_unsafe: alias port %d for hash %d, id %d\n",
port, hash, c->id);
#endif
return 0;
error_aliases:
/* too many aliases */
return -2;
error_not_found:
/* null connection */
return -1;
error_sec:
/* alias already present and pointing to a different connection
* (hijack attempt?) */
return -3;
}
/* add port as an alias for the "id" connection,
* returns 0 on success,-1 on failure */
int tcpconn_add_alias(int id, int port, int proto)
{
struct tcp_connection* c;
int ret;
struct ip_addr zero_ip;
int r;
int alias_flags;
/* fix the port */
port=port?port:((proto==PROTO_TLS)?SIPS_PORT:SIP_PORT);
TCPCONN_LOCK;
/* check if alias already exists */
c=_tcpconn_find(id, 0, 0, 0, 0);
if (likely(c)){
ip_addr_mk_any(c->rcv.src_ip.af, &zero_ip);
alias_flags=cfg_get(tcp, tcp_cfg, alias_flags);
/* alias src_ip:port, 0, 0 */
ret=_tcpconn_add_alias_unsafe(c, port, &zero_ip, 0,
alias_flags);
if (ret<0 && ret!=-3) goto error;
/* alias src_ip:port, local_ip, 0 */
ret=_tcpconn_add_alias_unsafe(c, port, &c->rcv.dst_ip, 0,
alias_flags);
if (ret<0 && ret!=-3) goto error;
/* alias src_ip:port, local_ip, local_port */
ret=_tcpconn_add_alias_unsafe(c, port, &c->rcv.dst_ip, c->rcv.dst_port,
alias_flags);
if (unlikely(ret<0)) goto error;
}else goto error_not_found;
TCPCONN_UNLOCK;
return 0;
error_not_found:
TCPCONN_UNLOCK;
LOG(L_ERR, "ERROR: tcpconn_add_alias: no connection found for id %d\n",id);
return -1;
error:
TCPCONN_UNLOCK;
switch(ret){
case -2:
LOG(L_ERR, "ERROR: tcpconn_add_alias: too many aliases (%d)"
" for connection %p (id %d) %s:%d <- %d\n",
c->aliases, c, c->id, ip_addr2a(&c->rcv.src_ip),
c->rcv.src_port, port);
for (r=0; r<c->aliases; r++){
LOG(L_ERR, "ERROR: tcpconn_add_alias: alias %d: for %p (%d)"
" %s:%d <-%d hash %x\n", r, c, c->id,
ip_addr2a(&c->rcv.src_ip), c->rcv.src_port,
c->con_aliases[r].port, c->con_aliases[r].hash);
}
break;
case -3:
LOG(L_ERR, "ERROR: tcpconn_add_alias: possible port"
" hijack attempt\n");
LOG(L_ERR, "ERROR: tcpconn_add_alias: alias for %d port %d already"
" present and points to another connection \n",
c->id, port);
break;
default:
LOG(L_ERR, "ERROR: tcpconn_add_alias: unkown error %d\n", ret);
}
return -1;
}
#ifdef TCP_FD_CACHE
static void tcp_fd_cache_init()
{
int r;
for (r=0; r<TCP_FD_CACHE_SIZE; r++)
fd_cache[r].fd=-1;
}
inline static struct fd_cache_entry* tcp_fd_cache_get(struct tcp_connection *c)
{
int h;
h=c->id%TCP_FD_CACHE_SIZE;
if ((fd_cache[h].fd>0) && (fd_cache[h].id==c->id) && (fd_cache[h].con==c))
return &fd_cache[h];
return 0;
}
inline static void tcp_fd_cache_rm(struct fd_cache_entry* e)
{
e->fd=-1;
}
inline static void tcp_fd_cache_add(struct tcp_connection *c, int fd)
{
int h;
h=c->id%TCP_FD_CACHE_SIZE;
if (likely(fd_cache[h].fd>0))
close(fd_cache[h].fd);
fd_cache[h].fd=fd;
fd_cache[h].id=c->id;
fd_cache[h].con=c;
}
#endif /* TCP_FD_CACHE */
inline static int tcpconn_chld_put(struct tcp_connection* tcpconn);
/* finds a tcpconn & sends on it
* uses the dst members to, proto (TCP|TLS) and id and tries to send
* from the "from" address (if non null and id==0)
* returns: number of bytes written (>=0) on success
* <0 on error */
int tcp_send(struct dest_info* dst, union sockaddr_union* from,
char* buf, unsigned len)
{
struct tcp_connection *c;
struct tcp_connection *tmp;
struct ip_addr ip;
int port;
int fd;
long response[2];
int n;
int do_close_fd;
ticks_t con_lifetime;
#ifdef TCP_ASYNC
int enable_write_watch;
#endif /* TCP_ASYNC */
#ifdef TCP_FD_CACHE
struct fd_cache_entry* fd_cache_e;
int use_fd_cache;
use_fd_cache=cfg_get(tcp, tcp_cfg, fd_cache);
fd_cache_e=0;
#endif /* TCP_FD_CACHE */
do_close_fd=1; /* close the fd on exit */
port=su_getport(&dst->to);
con_lifetime=cfg_get(tcp, tcp_cfg, con_lifetime);
if (likely(port)){
su2ip_addr(&ip, &dst->to);
c=tcpconn_get(dst->id, &ip, port, from, con_lifetime);
}else if (likely(dst->id)){
c=tcpconn_get(dst->id, 0, 0, 0, con_lifetime);
}else{
LOG(L_CRIT, "BUG: tcp_send called with null id & to\n");
return -1;
}
if (likely(dst->id)){
if (unlikely(c==0)) {
if (likely(port)){
/* try again w/o id */
c=tcpconn_get(0, &ip, port, from, con_lifetime);
}else{
LOG(L_ERR, "ERROR: tcp_send: id %d not found, dropping\n",
dst->id);
return -1;
}
}
}
/* no_id: */
if (unlikely((c==0) || tcpconn_close_after_send(c))){
if (unlikely(c)){
/* can't use c if it's marked as close-after-send =>
release it and try opening new one */
tcpconn_chld_put(c); /* release c (dec refcnt & free on 0) */
c=0;
}
/* check if connect() is disabled */
if (unlikely((dst->send_flags & SND_F_FORCE_CON_REUSE) ||
cfg_get(tcp, tcp_cfg, no_connect)))
return -1;
DBG("tcp_send: no open tcp connection found, opening new one\n");
/* create tcp connection */
if (likely(from==0)){
/* check to see if we have to use a specific source addr. */
switch (dst->to.s.sa_family) {
case AF_INET:
from = tcp_source_ipv4;
break;
#ifdef USE_IPV6
case AF_INET6:
from = tcp_source_ipv6;
break;
#endif
default:
/* error, bad af, ignore ... */
break;
}
}
#if defined(TCP_CONNECT_WAIT) && defined(TCP_ASYNC)
if (likely(cfg_get(tcp, tcp_cfg, tcp_connect_wait) &&
cfg_get(tcp, tcp_cfg, async) )){
if (unlikely(*tcp_connections_no >=
cfg_get(tcp, tcp_cfg, max_connections))){
LOG(L_ERR, "ERROR: tcp_send %s: maximum number of"
" connections exceeded (%d/%d)\n",
su2a(&dst->to, sizeof(dst->to)),
*tcp_connections_no,
cfg_get(tcp, tcp_cfg, max_connections));
return -1;
}
c=tcpconn_new(-1, &dst->to, from, 0, dst->proto,
S_CONN_CONNECT);
if (unlikely(c==0)){
LOG(L_ERR, "ERROR: tcp_send %s: could not create new"
" connection\n",
su2a(&dst->to, sizeof(dst->to)));
return -1;
}
c->flags|=F_CONN_PENDING|F_CONN_FD_CLOSED;
tcpconn_set_send_flags(c, dst->send_flags);
atomic_set(&c->refcnt, 2); /* ref from here and from main hash
table */
/* add it to id hash and aliases */
if (unlikely(tcpconn_add(c)==0)){
LOG(L_ERR, "ERROR: tcp_send %s: could not add "
"connection %p\n",
su2a(&dst->to, sizeof(dst->to)),
c);
_tcpconn_free(c);
n=-1;
goto end_no_conn;
}
/* do connect and if src ip or port changed, update the
* aliases */
if (unlikely((fd=tcpconn_finish_connect(c, from))<0)){
/* tcpconn_finish_connect will automatically blacklist
on error => no need to do it here */
LOG(L_ERR, "ERROR: tcp_send %s: tcpconn_finish_connect(%p)"
" failed\n", su2a(&dst->to, sizeof(dst->to)),
c);
goto conn_wait_error;
}
/* ? TODO: it might be faster just to queue the write directly
* and send to main CONN_NEW_PENDING_WRITE */
/* delay sending the fd to main after the send */
/* NOTE: no lock here, because the connection is marked as
* pending and nobody else will try to write on it. However
* this might produce out-of-order writes. If this is not
* desired either lock before the write or use
* _wbufq_insert(...) */
n=_tcpconn_write_nb(fd, c, buf, len);
if (unlikely(n<(int)len)){
if ((n>=0) || errno==EAGAIN || errno==EWOULDBLOCK){
DBG("tcp_send: pending write on new connection %p "
" (%d/%d bytes written)\n", c, n, len);
if (n<0) n=0;
else{
TCP_STATS_ESTABLISHED(S_CONN_CONNECT);
c->state=S_CONN_OK; /* partial write => connect()
ended */
}
/* add to the write queue */
lock_get(&c->write_lock);
if (unlikely(_wbufq_insert(c, buf+n, len-n)<0)){
lock_release(&c->write_lock);
n=-1;
LOG(L_ERR, "ERROR: tcp_send %s: EAGAIN and"
" write queue full or failed for %p\n",
su2a(&dst->to, sizeof(dst->to)),
c);
goto conn_wait_error;
}
lock_release(&c->write_lock);
/* send to tcp_main */
response[0]=(long)c;
response[1]=CONN_NEW_PENDING_WRITE;
if (unlikely(send_fd(unix_tcp_sock, response,
sizeof(response), fd) <= 0)){
LOG(L_ERR, "BUG: tcp_send %s: "
"CONN_NEW_PENDING_WRITE for %p"
" failed:" " %s (%d)\n",
su2a(&dst->to, sizeof(dst->to)),
c, strerror(errno), errno);
goto conn_wait_error;
}
n=len;
goto end;
}
/* if first write failed it's most likely a
connect error */
switch(errno){
case ENETUNREACH:
case EHOSTUNREACH: /* not posix for send() */
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_add( BLST_ERR_CONNECT, dst, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_UNREACHABLE(errno, TCP_LADDR(c),
TCP_LPORT(c), TCP_PSU(c), TCP_PROTO(c));
break;
case ECONNREFUSED:
case ECONNRESET:
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_add( BLST_ERR_CONNECT, dst, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_RST(errno, TCP_LADDR(c),
TCP_LPORT(c), TCP_PSU(c), TCP_PROTO(c));
break;
default:
TCP_EV_CONNECT_ERR(errno, TCP_LADDR(c),
TCP_LPORT(c), TCP_PSU(c), TCP_PROTO(c));
}
/* error: destroy it directly */
TCP_STATS_CONNECT_FAILED();
LOG(L_ERR, "ERROR: tcp_send %s: connect & send "
" for %p failed:" " %s (%d)\n",
su2a(&dst->to, sizeof(dst->to)),
c, strerror(errno), errno);
goto conn_wait_error;
}
LOG(L_INFO, "tcp_send: quick connect for %p\n", c);
TCP_STATS_ESTABLISHED(S_CONN_CONNECT);
if (unlikely(dst->send_flags & SND_F_CON_CLOSE)){
/* if close-after-send requested, don't bother
sending the fd back to tcp_main, try closing it
immediately (no other tcp_send should use it,
because it is marked as close-after-send before
being added to the hash */
goto conn_wait_close;
}
c->state=S_CONN_OK;
/* send to tcp_main */
response[0]=(long)c;
response[1]=CONN_NEW_COMPLETE;
if (unlikely(send_fd(unix_tcp_sock, response,
sizeof(response), fd) <= 0)){
LOG(L_ERR, "BUG: tcp_send %s: CONN_NEW_COMPLETE for %p"
" failed:" " %s (%d)\n",
su2a(&dst->to, sizeof(dst->to)),
c, strerror(errno), errno);
goto conn_wait_error;
}
goto end;
}
#endif /* TCP_CONNECT_WAIT && TCP_ASYNC */
if (unlikely((c=tcpconn_connect(&dst->to, from, dst->proto))==0)){
LOG(L_ERR, "ERROR: tcp_send %s: connect failed\n",
su2a(&dst->to, sizeof(dst->to)));
return -1;
}
tcpconn_set_send_flags(c, dst->send_flags);
if (likely(c->state==S_CONN_OK))
TCP_STATS_ESTABLISHED(S_CONN_CONNECT);
atomic_set(&c->refcnt, 2); /* ref. from here and it will also
be added in the tcp_main hash */
fd=c->s;
c->flags|=F_CONN_FD_CLOSED; /* not yet opened in main */
/* ? TODO: it might be faster just to queue the write and
* send to main a CONN_NEW_PENDING_WRITE */
/* send the new tcpconn to "tcp main" */
response[0]=(long)c;
response[1]=CONN_NEW;
n=send_fd(unix_tcp_sock, response, sizeof(response), c->s);
if (unlikely(n<=0)){
LOG(L_ERR, "BUG: tcp_send %s: failed send_fd: %s (%d)\n",
su2a(&dst->to, sizeof(dst->to)),
strerror(errno), errno);
/* we can safely delete it, it's not referenced by anybody */
_tcpconn_free(c);
n=-1;
goto end_no_conn;
}
goto send_it;
}
/* get_fd: */
#ifdef TCP_ASYNC
/* if data is already queued, we don't need the fd any more */
if (unlikely(cfg_get(tcp, tcp_cfg, async) &&
(_wbufq_non_empty(c)
#ifdef TCP_CONNECT_WAIT
|| (c->flags&F_CONN_PENDING)
#endif /* TCP_CONNECT_WAIT */
) )){
lock_get(&c->write_lock);
if (likely(_wbufq_non_empty(c)
#ifdef TCP_CONNECT_WAIT
|| (c->flags&F_CONN_PENDING)
#endif /* TCP_CONNECT_WAIT */
)){
do_close_fd=0;
if (unlikely(_wbufq_add(c, buf, len)<0)){
lock_release(&c->write_lock);
n=-1;
goto error;
}
n=len;
lock_release(&c->write_lock);
goto release_c;
}
lock_release(&c->write_lock);
}
#endif /* TCP_ASYNC */
/* check if this is not the same reader process holding
* c and if so send directly on c->fd */
if (c->reader_pid==my_pid()){
DBG("tcp_send: send from reader (%d (%d)), reusing fd\n",
my_pid(), process_no);
fd=c->fd;
do_close_fd=0; /* don't close the fd on exit, it's in use */
#ifdef TCP_FD_CACHE
use_fd_cache=0; /* don't cache: problems would arise due to the
close() on cache eviction (if the fd is still
used). If it has to be cached then dup() _must_
be used */
}else if (likely(use_fd_cache &&
((fd_cache_e=tcp_fd_cache_get(c))!=0))){
fd=fd_cache_e->fd;
do_close_fd=0;
DBG("tcp_send: found fd in cache ( %d, %p, %d)\n",
fd, c, fd_cache_e->id);
#endif /* TCP_FD_CACHE */
}else{
DBG("tcp_send: tcp connection found (%p), acquiring fd\n", c);
/* get the fd */
response[0]=(long)c;
response[1]=CONN_GET_FD;
n=send_all(unix_tcp_sock, response, sizeof(response));
if (unlikely(n<=0)){
LOG(L_ERR, "BUG: tcp_send: failed to get fd(write):%s (%d)\n",
strerror(errno), errno);
n=-1;
goto release_c;
}
DBG("tcp_send, c= %p, n=%d\n", c, n);
n=receive_fd(unix_tcp_sock, &tmp, sizeof(tmp), &fd, MSG_WAITALL);
if (unlikely(n<=0)){
LOG(L_ERR, "BUG: tcp_send: failed to get fd(receive_fd):"
" %s (%d)\n", strerror(errno), errno);
n=-1;
do_close_fd=0;
goto release_c;
}
if (unlikely(c!=tmp)){
LOG(L_CRIT, "BUG: tcp_send: get_fd: got different connection:"
" %p (id= %d, refcnt=%d state=%d) != "
" %p (n=%d)\n",
c, c->id, atomic_get(&c->refcnt), c->state,
tmp, n
);
n=-1; /* fail */
goto end;
}
DBG("tcp_send: after receive_fd: c= %p n=%d fd=%d\n",c, n, fd);
}
send_it:
DBG("tcp_send: sending...\n");
lock_get(&c->write_lock);
/* update connection send flags with the current ones */
tcpconn_set_send_flags(c, dst->send_flags);
#ifdef TCP_ASYNC
if (likely(cfg_get(tcp, tcp_cfg, async))){
if (_wbufq_non_empty(c)
#ifdef TCP_CONNECT_WAIT
|| (c->flags&F_CONN_PENDING)
#endif /* TCP_CONNECT_WAIT */
){
if (unlikely(_wbufq_add(c, buf, len)<0)){
lock_release(&c->write_lock);
n=-1;
goto error;
}
lock_release(&c->write_lock);
n=len;
goto end;
}
n=_tcpconn_write_nb(fd, c, buf, len);
}else{
#endif /* TCP_ASYNC */
#ifdef USE_TLS
if (c->type==PROTO_TLS)
n=tls_blocking_write(c, fd, buf, len);
else
#endif
/* n=tcp_blocking_write(c, fd, buf, len); */
n=tsend_stream(fd, buf, len,
TICKS_TO_S(cfg_get(tcp, tcp_cfg, send_timeout)) *
1000);
#ifdef TCP_ASYNC
}
#else /* ! TCP_ASYNC */
lock_release(&c->write_lock);
#endif /* TCP_ASYNC */
DBG("tcp_send: after real write: c= %p n=%d fd=%d\n",c, n, fd);
DBG("tcp_send: buf=\n%.*s\n", (int)len, buf);
if (unlikely(n<(int)len)){
#ifdef TCP_ASYNC
if (cfg_get(tcp, tcp_cfg, async) &&
((n>=0) || errno==EAGAIN || errno==EWOULDBLOCK)){
enable_write_watch=_wbufq_empty(c);
if (n<0) n=0;
else if (unlikely(c->state==S_CONN_CONNECT ||
c->state==S_CONN_ACCEPT)){
TCP_STATS_ESTABLISHED(c->state);
c->state=S_CONN_OK; /* something was written */
}
if (unlikely(_wbufq_add(c, buf+n, len-n)<0)){
lock_release(&c->write_lock);
n=-1;
goto error;
}
lock_release(&c->write_lock);
n=len;
if (likely(enable_write_watch)){
response[0]=(long)c;
response[1]=CONN_QUEUED_WRITE;
if (send_all(unix_tcp_sock, response, sizeof(response)) <= 0){
LOG(L_ERR, "BUG: tcp_send: error return failed "
"(write):%s (%d)\n", strerror(errno), errno);
n=-1;
goto error;
}
}
goto end;
}else{
lock_release(&c->write_lock);
}
#endif /* TCP_ASYNC */
if (unlikely(c->state==S_CONN_CONNECT)){
switch(errno){
case ENETUNREACH:
case EHOSTUNREACH: /* not posix for send() */
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT, c->rcv.proto,
&c->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_UNREACHABLE(errno, TCP_LADDR(c),
TCP_LPORT(c), TCP_PSU(c), TCP_PROTO(c));
break;
case ECONNREFUSED:
case ECONNRESET:
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT, c->rcv.proto,
&c->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_RST(errno, TCP_LADDR(c), TCP_LPORT(c),
TCP_PSU(c), TCP_PROTO(c));
break;
default:
TCP_EV_CONNECT_ERR(errno, TCP_LADDR(c), TCP_LPORT(c),
TCP_PSU(c), TCP_PROTO(c));
}
TCP_STATS_CONNECT_FAILED();
}else{
switch(errno){
case ECONNREFUSED:
case ECONNRESET:
TCP_STATS_CON_RESET();
/* no break */
case ENETUNREACH:
/*case EHOSTUNREACH: -- not posix */
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_SEND, c->rcv.proto,
&c->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
break;
}
}
LOG(L_ERR, "ERROR: tcp_send: failed to send on %p (%s:%d->%s): %s (%d)"
"\n", c, ip_addr2a(&c->rcv.dst_ip), c->rcv.dst_port,
su2a(&c->rcv.src_su, sizeof(c->rcv.src_su)),
strerror(errno), errno);
#ifdef TCP_ASYNC
error:
#endif /* TCP_ASYNC */
/* error on the connection , mark it as bad and set 0 timeout */
c->state=S_CONN_BAD;
c->timeout=get_ticks_raw();
/* tell "main" it should drop this (optional it will t/o anyway?)*/
response[0]=(long)c;
response[1]=CONN_ERROR;
if (send_all(unix_tcp_sock, response, sizeof(response))<=0){
LOG(L_CRIT, "BUG: tcp_send: error return failed (write):%s (%d)\n",
strerror(errno), errno);
tcpconn_chld_put(c); /* deref. it manually */
n=-1;
}
/* CONN_ERROR will auto-dec refcnt => we must not call tcpconn_put
* if it succeeds */
#ifdef TCP_FD_CACHE
if (unlikely(fd_cache_e)){
LOG(L_ERR, "ERROR: tcp_send %s: error on cached fd, removing from"
" the cache (%d, %p, %d)\n",
su2a(&c->rcv.src_su, sizeof(c->rcv.src_su)),
fd, fd_cache_e->con, fd_cache_e->id);
tcp_fd_cache_rm(fd_cache_e);
close(fd);
}else
#endif /* TCP_FD_CACHE */
if (do_close_fd) close(fd);
return n; /* error return, no tcpconn_put */
}
#ifdef TCP_ASYNC
lock_release(&c->write_lock);
#endif /* TCP_ASYNC */
/* in non-async mode here we're either in S_CONN_OK or S_CONN_ACCEPT*/
if (unlikely(c->state==S_CONN_CONNECT || c->state==S_CONN_ACCEPT)){
TCP_STATS_ESTABLISHED(c->state);
c->state=S_CONN_OK;
}
if (unlikely(dst->send_flags & SND_F_CON_CLOSE)){
/* close after write => send EOF request to tcp_main */
c->state=S_CONN_BAD;
c->timeout=get_ticks_raw();
/* tell "main" it should drop this*/
response[0]=(long)c;
response[1]=CONN_EOF;
if (send_all(unix_tcp_sock, response, sizeof(response))<=0){
LOG(L_CRIT, "BUG: tcp_send: error return failed (write):%s (%d)\n",
strerror(errno), errno);
tcpconn_chld_put(c); /* deref. it manually */
n=-1;
}
/* CONN_EOF will auto-dec refcnt => we must not call tcpconn_put
* if it succeeds */
#ifdef TCP_FD_CACHE
if (unlikely(fd_cache_e)){
tcp_fd_cache_rm(fd_cache_e);
fd_cache_e=0;
close(fd);
}else
#endif /* TCP_FD_CACHE */
if (do_close_fd) close(fd);
goto end_no_conn;
}
end:
#ifdef TCP_FD_CACHE
if (unlikely((fd_cache_e==0) && use_fd_cache)){
tcp_fd_cache_add(c, fd);
}else
#endif /* TCP_FD_CACHE */
if (do_close_fd) close(fd);
release_c:
tcpconn_chld_put(c); /* release c (dec refcnt & free on 0) */
end_no_conn:
return n;
#ifdef TCP_CONNECT_WAIT
conn_wait_error:
n=-1;
conn_wait_close:
/* connect or send failed or immediate close-after-send was requested on
* newly created connection which was not yet sent to tcp_main (but was
* already hashed) => don't send to main, unhash and destroy directly
* (if refcnt>2 it will be destroyed when the last sender releases the
* connection (tcpconn_chld_put(c))) or when tcp_main receives a
* CONN_ERROR it*/
c->state=S_CONN_BAD;
/* we are here only if we opened a new fd (and not reused a cached or
a reader one) => if the connect was successful close the fd */
if (fd>=0) close(fd);
TCPCONN_LOCK;
if (c->flags & F_CONN_HASHED){
/* if some other parallel tcp_send did send CONN_ERROR to
* tcp_main, the connection might be already detached */
_tcpconn_detach(c);
c->flags&=~F_CONN_HASHED;
TCPCONN_UNLOCK;
tcpconn_put(c);
}else
TCPCONN_UNLOCK;
/* dec refcnt -> mark it for destruction */
tcpconn_chld_put(c);
return n;
#endif /* TCP_CONNET_WAIT */
}
int tcp_init(struct socket_info* sock_info)
{
union sockaddr_union* addr;
int optval;
#ifdef HAVE_TCP_ACCEPT_FILTER
struct accept_filter_arg afa;
#endif /* HAVE_TCP_ACCEPT_FILTER */
#ifdef DISABLE_NAGLE
int flag;
struct protoent* pe;
if (tcp_proto_no==-1){ /* if not already set */
pe=getprotobyname("tcp");
if (pe==0){
LOG(L_ERR, "ERROR: tcp_init: could not get TCP protocol number\n");
tcp_proto_no=-1;
}else{
tcp_proto_no=pe->p_proto;
}
}
#endif
addr=&sock_info->su;
/* sock_info->proto=PROTO_TCP; */
if (init_su(addr, &sock_info->address, sock_info->port_no)<0){
LOG(L_ERR, "ERROR: tcp_init: could no init sockaddr_union\n");
goto error;
}
DBG("tcp_init: added %s\n", su2a(addr, sizeof(*addr)));
sock_info->socket=socket(AF2PF(addr->s.sa_family), SOCK_STREAM, 0);
if (sock_info->socket==-1){
LOG(L_ERR, "ERROR: tcp_init: socket: %s\n", strerror(errno));
goto error;
}
#ifdef DISABLE_NAGLE
flag=1;
if ( (tcp_proto_no!=-1) &&
(setsockopt(sock_info->socket, tcp_proto_no , TCP_NODELAY,
&flag, sizeof(flag))<0) ){
LOG(L_ERR, "ERROR: tcp_init: could not disable Nagle: %s\n",
strerror(errno));
}
#endif
#if !defined(TCP_DONT_REUSEADDR)
/* Stevens, "Network Programming", Section 7.5, "Generic Socket
* Options": "...server started,..a child continues..on existing
* connection..listening server is restarted...call to bind fails
* ... ALL TCP servers should specify the SO_REUSEADDRE option
* to allow the server to be restarted in this situation
*
* Indeed, without this option, the server can't restart.
* -jiri
*/
optval=1;
if (setsockopt(sock_info->socket, SOL_SOCKET, SO_REUSEADDR,
(void*)&optval, sizeof(optval))==-1) {
LOG(L_ERR, "ERROR: tcp_init: setsockopt %s\n",
strerror(errno));
goto error;
}
#endif
/* tos */
optval = tos;
if (setsockopt(sock_info->socket, IPPROTO_IP, IP_TOS, (void*)&optval,
sizeof(optval)) ==-1){
LOG(L_WARN, "WARNING: tcp_init: setsockopt tos: %s\n", strerror(errno));
/* continue since this is not critical */
}
#ifdef HAVE_TCP_DEFER_ACCEPT
/* linux only */
if ((optval=cfg_get(tcp, tcp_cfg, defer_accept))){
if (setsockopt(sock_info->socket, IPPROTO_TCP, TCP_DEFER_ACCEPT,
(void*)&optval, sizeof(optval)) ==-1){
LOG(L_WARN, "WARNING: tcp_init: setsockopt TCP_DEFER_ACCEPT %s\n",
strerror(errno));
/* continue since this is not critical */
}
}
#endif /* HAVE_TCP_DEFFER_ACCEPT */
#ifdef HAVE_TCP_SYNCNT
if ((optval=cfg_get(tcp, tcp_cfg, syncnt))){
if (setsockopt(sock_info->socket, IPPROTO_TCP, TCP_SYNCNT, &optval,
sizeof(optval))<0){
LOG(L_WARN, "WARNING: tcp_init: failed to set"
" maximum SYN retr. count: %s\n", strerror(errno));
}
}
#endif
#ifdef HAVE_TCP_LINGER2
if ((optval=cfg_get(tcp, tcp_cfg, linger2))){
if (setsockopt(sock_info->socket, IPPROTO_TCP, TCP_LINGER2, &optval,
sizeof(optval))<0){
LOG(L_WARN, "WARNING: tcp_init: failed to set"
" maximum LINGER2 timeout: %s\n", strerror(errno));
}
}
#endif
init_sock_keepalive(sock_info->socket);
if (bind(sock_info->socket, &addr->s, sockaddru_len(*addr))==-1){
LOG(L_ERR, "ERROR: tcp_init: bind(%x, %p, %d) on %s:%d : %s\n",
sock_info->socket, &addr->s,
(unsigned)sockaddru_len(*addr),
sock_info->address_str.s,
sock_info->port_no,
strerror(errno));
goto error;
}
if (listen(sock_info->socket, TCP_LISTEN_BACKLOG)==-1){
LOG(L_ERR, "ERROR: tcp_init: listen(%x, %p, %d) on %s: %s\n",
sock_info->socket, &addr->s,
(unsigned)sockaddru_len(*addr),
sock_info->address_str.s,
strerror(errno));
goto error;
}
#ifdef HAVE_TCP_ACCEPT_FILTER
/* freebsd */
if (cfg_get(tcp, tcp_cfg, defer_accept)){
memset(&afa, 0, sizeof(afa));
strcpy(afa.af_name, "dataready");
if (setsockopt(sock_info->socket, SOL_SOCKET, SO_ACCEPTFILTER,
(void*)&afa, sizeof(afa)) ==-1){
LOG(L_WARN, "WARNING: tcp_init: setsockopt SO_ACCEPTFILTER %s\n",
strerror(errno));
/* continue since this is not critical */
}
}
#endif /* HAVE_TCP_ACCEPT_FILTER */
return 0;
error:
if (sock_info->socket!=-1){
close(sock_info->socket);
sock_info->socket=-1;
}
return -1;
}
/* close tcp_main's fd from a tcpconn
* WARNING: call only in tcp_main context */
inline static void tcpconn_close_main_fd(struct tcp_connection* tcpconn)
{
int fd;
fd=tcpconn->s;
#ifdef USE_TLS
/*FIXME: lock ->writelock ? */
if (tcpconn->type==PROTO_TLS)
tls_close(tcpconn, fd);
#endif
#ifdef TCP_FD_CACHE
if (likely(cfg_get(tcp, tcp_cfg, fd_cache))) shutdown(fd, SHUT_RDWR);
#endif /* TCP_FD_CACHE */
close_again:
if (unlikely(close(fd)<0)){
if (errno==EINTR)
goto close_again;
LOG(L_ERR, "ERROR: tcpconn_put_destroy; close() failed: %s (%d)\n",
strerror(errno), errno);
}
}
/* dec refcnt & frees the connection if refcnt==0
* returns 1 if the connection is freed, 0 otherwise
*
* WARNING: use only from child processes */
inline static int tcpconn_chld_put(struct tcp_connection* tcpconn)
{
if (unlikely(atomic_dec_and_test(&tcpconn->refcnt))){
DBG("tcpconn_chld_put: destroying connection %p (%d, %d) "
"flags %04x\n", tcpconn, tcpconn->id,
tcpconn->s, tcpconn->flags);
/* sanity checks */
membar_read_atomic_op(); /* make sure we see the current flags */
if (unlikely(!(tcpconn->flags & F_CONN_FD_CLOSED) ||
(tcpconn->flags &
(F_CONN_HASHED|F_CONN_MAIN_TIMER|
F_CONN_READ_W|F_CONN_WRITE_W)) )){
LOG(L_CRIT, "BUG: tcpconn_chld_put: %p bad flags = %0x\n",
tcpconn, tcpconn->flags);
abort();
}
_tcpconn_free(tcpconn); /* destroys also the wbuf_q if still present*/
return 1;
}
return 0;
}
/* simple destroy function (the connection should be already removed
* from the hashes and the fds should not be watched anymore for IO)
*/
inline static void tcpconn_destroy(struct tcp_connection* tcpconn)
{
DBG("tcpconn_destroy: destroying connection %p (%d, %d) "
"flags %04x\n", tcpconn, tcpconn->id,
tcpconn->s, tcpconn->flags);
if (unlikely(tcpconn->flags & F_CONN_HASHED)){
LOG(L_CRIT, "BUG: tcpconn_destroy: called with hashed"
" connection (%p)\n", tcpconn);
/* try to continue */
if (likely(tcpconn->flags & F_CONN_MAIN_TIMER))
local_timer_del(&tcp_main_ltimer, &tcpconn->timer);
TCPCONN_LOCK;
_tcpconn_detach(tcpconn);
TCPCONN_UNLOCK;
}
if (likely(!(tcpconn->flags & F_CONN_FD_CLOSED))){
tcpconn_close_main_fd(tcpconn);
(*tcp_connections_no)--;
}
_tcpconn_free(tcpconn); /* destroys also the wbuf_q if still present*/
}
/* tries to destroy the connection: dec. refcnt and if 0 destroys the
* connection, else it will mark it as BAD and close the main fds
*
* returns 1 if the connection was destroyed, 0 otherwise
*
* WARNING: - the connection _has_ to be removed from the hash and timer
* first (use tcpconn_try_unhash() for this )
* - the fd should not be watched anymore (io_watch_del()...)
* - must be called _only_ from the tcp_main process context
* (or else the fd will remain open)
*/
inline static int tcpconn_put_destroy(struct tcp_connection* tcpconn)
{
if (unlikely((tcpconn->flags &
(F_CONN_WRITE_W|F_CONN_HASHED|F_CONN_MAIN_TIMER|F_CONN_READ_W)) )){
/* sanity check */
if (unlikely(tcpconn->flags & F_CONN_HASHED)){
LOG(L_CRIT, "BUG: tcpconn_destroy: called with hashed and/or"
"on timer connection (%p), flags = %0x\n",
tcpconn, tcpconn->flags);
/* try to continue */
if (likely(tcpconn->flags & F_CONN_MAIN_TIMER))
local_timer_del(&tcp_main_ltimer, &tcpconn->timer);
TCPCONN_LOCK;
_tcpconn_detach(tcpconn);
TCPCONN_UNLOCK;
}else{
LOG(L_CRIT, "BUG: tcpconn_put_destroy: %p flags = %0x\n",
tcpconn, tcpconn->flags);
}
}
tcpconn->state=S_CONN_BAD;
/* in case it's still in a reader timer */
tcpconn->timeout=get_ticks_raw();
/* fast close: close fds now */
if (likely(!(tcpconn->flags & F_CONN_FD_CLOSED))){
tcpconn_close_main_fd(tcpconn);
tcpconn->flags|=F_CONN_FD_CLOSED;
(*tcp_connections_no)--;
}
/* all the flags / ops on the tcpconn must be done prior to decrementing
* the refcnt. and at least a membar_write_atomic_op() mem. barrier or
* a mb_atomic_* op must * be used to make sure all the changed flags are
* written into memory prior to the new refcnt value */
if (unlikely(mb_atomic_dec_and_test(&tcpconn->refcnt))){
_tcpconn_free(tcpconn);
return 1;
}
return 0;
}
/* try to remove a connection from the hashes and timer.
* returns 1 if the connection was removed, 0 if not (connection not in
* hash)
*
* WARNING: call it only in the tcp_main process context or else the
* timer removal won't work.
*/
inline static int tcpconn_try_unhash(struct tcp_connection* tcpconn)
{
if (likely(tcpconn->flags & F_CONN_HASHED)){
tcpconn->state=S_CONN_BAD;
if (likely(tcpconn->flags & F_CONN_MAIN_TIMER)){
local_timer_del(&tcp_main_ltimer, &tcpconn->timer);
tcpconn->flags&=~F_CONN_MAIN_TIMER;
}else
/* in case it's still in a reader timer */
tcpconn->timeout=get_ticks_raw();
TCPCONN_LOCK;
if (tcpconn->flags & F_CONN_HASHED){
tcpconn->flags&=~F_CONN_HASHED;
_tcpconn_detach(tcpconn);
TCPCONN_UNLOCK;
}else{
/* tcp_send was faster and did unhash it itself */
TCPCONN_UNLOCK;
return 0;
}
#ifdef TCP_ASYNC
/* empty possible write buffers (optional) */
if (unlikely(_wbufq_non_empty(tcpconn))){
lock_get(&tcpconn->write_lock);
/* check again, while holding the lock */
if (likely(_wbufq_non_empty(tcpconn)))
_wbufq_destroy(&tcpconn->wbuf_q);
lock_release(&tcpconn->write_lock);
}
#endif /* TCP_ASYNC */
return 1;
}
return 0;
}
#ifdef SEND_FD_QUEUE
struct send_fd_info{
struct tcp_connection* tcp_conn;
ticks_t expire;
int unix_sock;
unsigned int retries; /* debugging */
};
struct tcp_send_fd_q{
struct send_fd_info* data; /* buffer */
struct send_fd_info* crt; /* pointer inside the buffer */
struct send_fd_info* end; /* points after the last valid position */
};
static struct tcp_send_fd_q send2child_q;
static int send_fd_queue_init(struct tcp_send_fd_q *q, unsigned int size)
{
q->data=pkg_malloc(size*sizeof(struct send_fd_info));
if (q->data==0){
LOG(L_ERR, "ERROR: send_fd_queue_init: out of memory\n");
return -1;
}
q->crt=&q->data[0];
q->end=&q->data[size];
return 0;
}
static void send_fd_queue_destroy(struct tcp_send_fd_q *q)
{
if (q->data){
pkg_free(q->data);
q->data=0;
q->crt=q->end=0;
}
}
static int init_send_fd_queues()
{
if (send_fd_queue_init(&send2child_q, SEND_FD_QUEUE_SIZE)!=0)
goto error;
return 0;
error:
LOG(L_ERR, "ERROR: init_send_fd_queues: init failed\n");
return -1;
}
static void destroy_send_fd_queues()
{
send_fd_queue_destroy(&send2child_q);
}
inline static int send_fd_queue_add( struct tcp_send_fd_q* q,
int unix_sock,
struct tcp_connection *t)
{
struct send_fd_info* tmp;
unsigned long new_size;
if (q->crt>=q->end){
new_size=q->end-&q->data[0];
if (new_size< MAX_SEND_FD_QUEUE_SIZE/2){
new_size*=2;
}else new_size=MAX_SEND_FD_QUEUE_SIZE;
if (unlikely(q->crt>=&q->data[new_size])){
LOG(L_ERR, "ERROR: send_fd_queue_add: queue full: %ld/%ld\n",
(long)(q->crt-&q->data[0]-1), new_size);
goto error;
}
LOG(L_CRIT, "INFO: send_fd_queue: queue full: %ld, extending to %ld\n",
(long)(q->end-&q->data[0]), new_size);
tmp=pkg_realloc(q->data, new_size*sizeof(struct send_fd_info));
if (unlikely(tmp==0)){
LOG(L_ERR, "ERROR: send_fd_queue_add: out of memory\n");
goto error;
}
q->crt=(q->crt-&q->data[0])+tmp;
q->data=tmp;
q->end=&q->data[new_size];
}
q->crt->tcp_conn=t;
q->crt->unix_sock=unix_sock;
q->crt->expire=get_ticks_raw()+SEND_FD_QUEUE_TIMEOUT;
q->crt->retries=0;
q->crt++;
return 0;
error:
return -1;
}
inline static void send_fd_queue_run(struct tcp_send_fd_q* q)
{
struct send_fd_info* p;
struct send_fd_info* t;
for (p=t=&q->data[0]; p<q->crt; p++){
if (unlikely(send_fd(p->unix_sock, &(p->tcp_conn),
sizeof(struct tcp_connection*), p->tcp_conn->s)<=0)){
if ( ((errno==EAGAIN)||(errno==EWOULDBLOCK)) &&
((s_ticks_t)(p->expire-get_ticks_raw())>0)){
/* leave in queue for a future try */
*t=*p;
t->retries++;
t++;
}else{
LOG(L_ERR, "ERROR: run_send_fd_queue: send_fd failed"
" on socket %d , queue entry %ld, retries %d,"
" connection %p, tcp socket %d, errno=%d (%s) \n",
p->unix_sock, (long)(p-&q->data[0]), p->retries,
p->tcp_conn, p->tcp_conn->s, errno,
strerror(errno));
#ifdef TCP_ASYNC
if (p->tcp_conn->flags & F_CONN_WRITE_W){
io_watch_del(&io_h, p->tcp_conn->s, -1, IO_FD_CLOSING);
p->tcp_conn->flags &=~F_CONN_WRITE_W;
}
#endif
p->tcp_conn->flags &= ~F_CONN_READER;
if (likely(tcpconn_try_unhash(p->tcp_conn)))
tcpconn_put(p->tcp_conn);
tcpconn_put_destroy(p->tcp_conn); /* dec refcnt & destroy */
}
}
}
q->crt=t;
}
#else
#define send_fd_queue_run(q)
#endif
/* non blocking write() on a tcpconnection, unsafe version (should be called
* while holding c->write_lock). The fd should be non-blocking.
* returns number of bytes written on success, -1 on error (and sets errno)
*/
inline static int _tcpconn_write_nb(int fd, struct tcp_connection* c,
char* buf, int len)
{
int n;
again:
#ifdef USE_TLS
if (unlikely(c->type==PROTO_TLS))
/* FIXME: tls_nonblocking_write !! */
n=tls_blocking_write(c, fd, buf, len);
else
#endif /* USE_TLS */
n=send(fd, buf, len,
#ifdef HAVE_MSG_NOSIGNAL
MSG_NOSIGNAL
#else
0
#endif /* HAVE_MSG_NOSIGNAL */
);
if (unlikely(n<0)){
if (errno==EINTR) goto again;
}
return n;
}
/* handles io from a tcp child process
* params: tcp_c - pointer in the tcp_children array, to the entry for
* which an io event was detected
* fd_i - fd index in the fd_array (usefull for optimizing
* io_watch_deletes)
* returns: handle_* return convention: -1 on error, 0 on EAGAIN (no more
* io events queued), >0 on success. success/error refer only to
* the reads from the fd.
*/
inline static int handle_tcp_child(struct tcp_child* tcp_c, int fd_i)
{
struct tcp_connection* tcpconn;
long response[2];
int cmd;
int bytes;
int n;
ticks_t t;
ticks_t crt_timeout;
ticks_t con_lifetime;
if (unlikely(tcp_c->unix_sock<=0)){
/* (we can't have a fd==0, 0 is never closed )*/
LOG(L_CRIT, "BUG: handle_tcp_child: fd %d for %d "
"(pid %d, ser no %d)\n", tcp_c->unix_sock,
(int)(tcp_c-&tcp_children[0]), tcp_c->pid, tcp_c->proc_no);
goto error;
}
/* read until sizeof(response)
* (this is a SOCK_STREAM so read is not atomic) */
bytes=recv_all(tcp_c->unix_sock, response, sizeof(response), MSG_DONTWAIT);
if (unlikely(bytes<(int)sizeof(response))){
if (bytes==0){
/* EOF -> bad, child has died */
DBG("DBG: handle_tcp_child: dead tcp child %d (pid %d, no %d)"
" (shutting down?)\n", (int)(tcp_c-&tcp_children[0]),
tcp_c->pid, tcp_c->proc_no );
/* don't listen on it any more */
io_watch_del(&io_h, tcp_c->unix_sock, fd_i, 0);
goto error; /* eof. so no more io here, it's ok to return error */
}else if (bytes<0){
/* EAGAIN is ok if we try to empty the buffer
* e.g.: SIGIO_RT overflow mode or EPOLL ET */
if ((errno!=EAGAIN) && (errno!=EWOULDBLOCK)){
LOG(L_CRIT, "ERROR: handle_tcp_child: read from tcp child %ld "
" (pid %d, no %d) %s [%d]\n",
(long)(tcp_c-&tcp_children[0]), tcp_c->pid,
tcp_c->proc_no, strerror(errno), errno );
}else{
bytes=0;
}
/* try to ignore ? */
goto end;
}else{
/* should never happen */
LOG(L_CRIT, "BUG: handle_tcp_child: too few bytes received (%d)\n",
bytes );
bytes=0; /* something was read so there is no error; otoh if
receive_fd returned less then requested => the receive
buffer is empty => no more io queued on this fd */
goto end;
}
}
DBG("handle_tcp_child: reader response= %lx, %ld from %d \n",
response[0], response[1], (int)(tcp_c-&tcp_children[0]));
cmd=response[1];
tcpconn=(struct tcp_connection*)response[0];
if (unlikely(tcpconn==0)){
/* should never happen */
LOG(L_CRIT, "BUG: handle_tcp_child: null tcpconn pointer received"
" from tcp child %d (pid %d): %lx, %lx\n",
(int)(tcp_c-&tcp_children[0]), tcp_c->pid,
response[0], response[1]) ;
goto end;
}
switch(cmd){
case CONN_RELEASE:
tcp_c->busy--;
if (unlikely(tcpconn_put(tcpconn))){
tcpconn_destroy(tcpconn);
break;
}
if (unlikely(tcpconn->state==S_CONN_BAD)){
#ifdef TCP_ASYNC
if (unlikely(tcpconn->flags & F_CONN_WRITE_W)){
io_watch_del(&io_h, tcpconn->s, -1, IO_FD_CLOSING);
tcpconn->flags &= ~F_CONN_WRITE_W;
}
#endif /* TCP_ASYNC */
if (tcpconn_try_unhash(tcpconn))
tcpconn_put_destroy(tcpconn);
break;
}
/* update the timeout*/
t=get_ticks_raw();
con_lifetime=cfg_get(tcp, tcp_cfg, con_lifetime);
tcpconn->timeout=t+con_lifetime;
crt_timeout=con_lifetime;
#ifdef TCP_ASYNC
if (unlikely(cfg_get(tcp, tcp_cfg, async) &&
_wbufq_non_empty(tcpconn) )){
if (unlikely(TICKS_GE(t, tcpconn->wbuf_q.wr_timeout))){
DBG("handle_tcp_child: wr. timeout on CONN_RELEASE for %p "
"refcnt= %d\n", tcpconn,
atomic_get(&tcpconn->refcnt));
/* timeout */
if (unlikely(tcpconn->state==S_CONN_CONNECT)){
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su( BLST_ERR_CONNECT,
tcpconn->rcv.proto,
&tcpconn->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_TIMEOUT(0, TCP_LADDR(tcpconn),
TCP_LPORT(tcpconn), TCP_PSU(tcpconn),
TCP_PROTO(tcpconn));
TCP_STATS_CONNECT_FAILED();
}else{
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su( BLST_ERR_SEND,
tcpconn->rcv.proto,
&tcpconn->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_SEND_TIMEOUT(0, &tcpconn->rcv);
TCP_STATS_SEND_TIMEOUT();
}
if (unlikely(tcpconn->flags & F_CONN_WRITE_W)){
io_watch_del(&io_h, tcpconn->s, -1, IO_FD_CLOSING);
tcpconn->flags&=~F_CONN_WRITE_W;
}
if (tcpconn_try_unhash(tcpconn))
tcpconn_put_destroy(tcpconn);
break;
}else{
crt_timeout=MIN_unsigned(con_lifetime,
tcpconn->wbuf_q.wr_timeout-t);
}
}
#endif /* TCP_ASYNC */
/* re-activate the timer */
tcpconn->timer.f=tcpconn_main_timeout;
local_timer_reinit(&tcpconn->timer);
local_timer_add(&tcp_main_ltimer, &tcpconn->timer, crt_timeout, t);
/* must be after the de-ref*/
tcpconn->flags|=(F_CONN_MAIN_TIMER|F_CONN_READ_W|F_CONN_WANTS_RD);
tcpconn->flags&=~(F_CONN_READER|F_CONN_OOB_DATA);
#ifdef TCP_ASYNC
if (unlikely(tcpconn->flags & F_CONN_WRITE_W))
n=io_watch_chg(&io_h, tcpconn->s, POLLIN| POLLOUT, -1);
else
#endif /* TCP_ASYNC */
n=io_watch_add(&io_h, tcpconn->s, POLLIN, F_TCPCONN, tcpconn);
if (unlikely(n<0)){
LOG(L_CRIT, "ERROR: tcp_main: handle_tcp_child: failed to add"
" new socket to the fd list\n");
tcpconn->flags&=~F_CONN_READ_W;
#ifdef TCP_ASYNC
if (unlikely(tcpconn->flags & F_CONN_WRITE_W)){
io_watch_del(&io_h, tcpconn->s, -1, IO_FD_CLOSING);
tcpconn->flags&=~F_CONN_WRITE_W;
}
#endif /* TCP_ASYNC */
if (tcpconn_try_unhash(tcpconn))
tcpconn_put_destroy(tcpconn);
break;
}
DBG("handle_tcp_child: CONN_RELEASE %p refcnt= %d\n",
tcpconn, atomic_get(&tcpconn->refcnt));
break;
case CONN_ERROR:
case CONN_DESTROY:
case CONN_EOF:
/* WARNING: this will auto-dec. refcnt! */
tcp_c->busy--;
/* main doesn't listen on it => we don't have to delete it
if (tcpconn->s!=-1)
io_watch_del(&io_h, tcpconn->s, -1, IO_FD_CLOSING);
*/
#ifdef TCP_ASYNC
if ((tcpconn->flags & F_CONN_WRITE_W) && (tcpconn->s!=-1)){
io_watch_del(&io_h, tcpconn->s, -1, IO_FD_CLOSING);
tcpconn->flags&=~F_CONN_WRITE_W;
}
#endif /* TCP_ASYNC */
if (tcpconn_try_unhash(tcpconn))
tcpconn_put(tcpconn);
tcpconn_put_destroy(tcpconn); /* deref & delete if refcnt==0 */
break;
default:
LOG(L_CRIT, "BUG: handle_tcp_child: unknown cmd %d"
" from tcp reader %d\n",
cmd, (int)(tcp_c-&tcp_children[0]));
}
end:
return bytes;
error:
return -1;
}
/* handles io from a "generic" ser process (get fd or new_fd from a tcp_send)
*
* params: p - pointer in the ser processes array (pt[]), to the entry for
* which an io event was detected
* fd_i - fd index in the fd_array (usefull for optimizing
* io_watch_deletes)
* returns: handle_* return convention:
* -1 on error reading from the fd,
* 0 on EAGAIN or when no more io events are queued
* (receive buffer empty),
* >0 on successfull reads from the fd (the receive buffer might
* be non-empty).
*/
inline static int handle_ser_child(struct process_table* p, int fd_i)
{
struct tcp_connection* tcpconn;
long response[2];
int cmd;
int bytes;
int ret;
int fd;
int flags;
ticks_t t;
ticks_t con_lifetime;
#ifdef TCP_ASYNC
ticks_t nxt_timeout;
#endif /* TCP_ASYNC */
ret=-1;
if (unlikely(p->unix_sock<=0)){
/* (we can't have a fd==0, 0 is never closed )*/
LOG(L_CRIT, "BUG: handle_ser_child: fd %d for %d "
"(pid %d)\n", p->unix_sock, (int)(p-&pt[0]), p->pid);
goto error;
}
/* get all bytes and the fd (if transmitted)
* (this is a SOCK_STREAM so read is not atomic) */
bytes=receive_fd(p->unix_sock, response, sizeof(response), &fd,
MSG_DONTWAIT);
if (unlikely(bytes<(int)sizeof(response))){
/* too few bytes read */
if (bytes==0){
/* EOF -> bad, child has died */
DBG("DBG: handle_ser_child: dead child %d, pid %d"
" (shutting down?)\n", (int)(p-&pt[0]), p->pid);
/* don't listen on it any more */
io_watch_del(&io_h, p->unix_sock, fd_i, 0);
goto error; /* child dead => no further io events from it */
}else if (bytes<0){
/* EAGAIN is ok if we try to empty the buffer
* e.g: SIGIO_RT overflow mode or EPOLL ET */
if ((errno!=EAGAIN) && (errno!=EWOULDBLOCK)){
LOG(L_CRIT, "ERROR: handle_ser_child: read from child %d "
"(pid %d): %s [%d]\n", (int)(p-&pt[0]), p->pid,
strerror(errno), errno);
ret=-1;
}else{
ret=0;
}
/* try to ignore ? */
goto end;
}else{
/* should never happen */
LOG(L_CRIT, "BUG: handle_ser_child: too few bytes received (%d)\n",
bytes );
ret=0; /* something was read so there is no error; otoh if
receive_fd returned less then requested => the receive
buffer is empty => no more io queued on this fd */
goto end;
}
}
ret=1; /* something was received, there might be more queued */
DBG("handle_ser_child: read response= %lx, %ld, fd %d from %d (%d)\n",
response[0], response[1], fd, (int)(p-&pt[0]), p->pid);
cmd=response[1];
tcpconn=(struct tcp_connection*)response[0];
if (unlikely(tcpconn==0)){
LOG(L_CRIT, "BUG: handle_ser_child: null tcpconn pointer received"
" from child %d (pid %d): %lx, %lx\n",
(int)(p-&pt[0]), p->pid, response[0], response[1]) ;
goto end;
}
switch(cmd){
case CONN_ERROR:
LOG(L_ERR, "handle_ser_child: ERROR: received CON_ERROR for %p"
" (id %d), refcnt %d\n",
tcpconn, tcpconn->id, atomic_get(&tcpconn->refcnt));
case CONN_EOF: /* forced EOF after full send, due to send flags */
#ifdef TCP_CONNECT_WAIT
/* if the connection is pending => it might be on the way of
* reaching tcp_main (e.g. CONN_NEW_COMPLETE or
* CONN_NEW_PENDING_WRITE) => it cannot be destroyed here */
if ( !(tcpconn->flags & F_CONN_PENDING) &&
tcpconn_try_unhash(tcpconn) )
tcpconn_put(tcpconn);
#else /* ! TCP_CONNECT_WAIT */
if ( tcpconn_try_unhash(tcpconn) )
tcpconn_put(tcpconn);
#endif /* TCP_CONNECT_WAIT */
if ( ((tcpconn->flags & (F_CONN_WRITE_W|F_CONN_READ_W)) ) &&
(tcpconn->s!=-1)){
io_watch_del(&io_h, tcpconn->s, -1, IO_FD_CLOSING);
tcpconn->flags&=~(F_CONN_WRITE_W|F_CONN_READ_W);
}
tcpconn_put_destroy(tcpconn); /* dec refcnt & destroy on 0 */
break;
case CONN_GET_FD:
/* send the requested FD */
/* WARNING: take care of setting refcnt properly to
* avoid race conditions */
if (unlikely(send_fd(p->unix_sock, &tcpconn, sizeof(tcpconn),
tcpconn->s)<=0)){
LOG(L_ERR, "ERROR: handle_ser_child: send_fd failed\n");
}
break;
case CONN_NEW:
/* update the fd in the requested tcpconn*/
/* WARNING: take care of setting refcnt properly to
* avoid race conditions */
if (unlikely(fd==-1)){
LOG(L_CRIT, "BUG: handle_ser_child: CONN_NEW:"
" no fd received\n");
tcpconn->flags|=F_CONN_FD_CLOSED;
tcpconn_put_destroy(tcpconn);
break;
}
(*tcp_connections_no)++;
tcpconn->s=fd;
/* add tcpconn to the list*/
tcpconn_add(tcpconn);
/* update the timeout*/
t=get_ticks_raw();
con_lifetime=cfg_get(tcp, tcp_cfg, con_lifetime);
tcpconn->timeout=t+con_lifetime;
/* activate the timer (already properly init. in tcpconn_new())
* no need for reinit */
local_timer_add(&tcp_main_ltimer, &tcpconn->timer,
con_lifetime, t);
tcpconn->flags|=(F_CONN_MAIN_TIMER|F_CONN_READ_W|F_CONN_WANTS_RD)
#ifdef TCP_ASYNC
/* not used for now, the connection is sent to tcp_main
* before knowing whether we can write on it or we should
* wait */
| (((int)!(tcpconn->flags & F_CONN_WANTS_WR)-1)&
F_CONN_WRITE_W)
#endif /* TCP_ASYNC */
;
tcpconn->flags&=~F_CONN_FD_CLOSED;
flags=POLLIN
#ifdef TCP_ASYNC
/* not used for now, the connection is sent to tcp_main
* before knowing if we can write on it or we should
* wait */
| (((int)!(tcpconn->flags & F_CONN_WANTS_WR)-1) & POLLOUT)
#endif /* TCP_ASYNC */
;
if (unlikely(
io_watch_add(&io_h, tcpconn->s, flags,
F_TCPCONN, tcpconn)<0)){
LOG(L_CRIT, "ERROR: tcp_main: handle_ser_child: failed to add"
" new socket to the fd list\n");
tcpconn->flags&=~(F_CONN_WRITE_W|F_CONN_READ_W);
tcpconn_try_unhash(tcpconn); /* unhash & dec refcnt */
tcpconn_put_destroy(tcpconn);
}
break;
#ifdef TCP_ASYNC
case CONN_QUEUED_WRITE:
/* received only if the wr. queue is empty and a write finishes
* with EAGAIN (common after connect())
* it should only enable write watching on the fd. The connection
* should be already in the hash. The refcnt is not changed.
*/
if (unlikely((tcpconn->state==S_CONN_BAD) ||
!(tcpconn->flags & F_CONN_HASHED) ))
break;
if (!(tcpconn->flags & F_CONN_WANTS_WR)){
tcpconn->flags|=F_CONN_WANTS_WR;
t=get_ticks_raw();
if (likely((tcpconn->flags & F_CONN_MAIN_TIMER) &&
(TICKS_LT(tcpconn->wbuf_q.wr_timeout, tcpconn->timeout)) &&
TICKS_LT(t, tcpconn->wbuf_q.wr_timeout) )){
/* _wbufq_nonempty() is guaranteed here */
/* update the timer */
local_timer_del(&tcp_main_ltimer, &tcpconn->timer);
local_timer_reinit(&tcpconn->timer);
local_timer_add(&tcp_main_ltimer, &tcpconn->timer,
tcpconn->wbuf_q.wr_timeout-t, t);
DBG("tcp_main: handle_ser_child: CONN_QUEUED_WRITE; %p "
"timeout adjusted to %d s\n", tcpconn,
TICKS_TO_S(tcpconn->wbuf_q.wr_timeout-t));
}
if (!(tcpconn->flags & F_CONN_WRITE_W)){
tcpconn->flags|=F_CONN_WRITE_W;
if (!(tcpconn->flags & F_CONN_READ_W)){
if (unlikely(io_watch_add(&io_h, tcpconn->s, POLLOUT,
F_TCPCONN, tcpconn)<0)){
LOG(L_CRIT, "ERROR: tcp_main: handle_ser_child:"
" failed to enable write watch on"
" socket\n");
if (tcpconn_try_unhash(tcpconn))
tcpconn_put_destroy(tcpconn);
break;
}
}else{
if (unlikely(io_watch_chg(&io_h, tcpconn->s,
POLLIN|POLLOUT, -1)<0)){
LOG(L_CRIT, "ERROR: tcp_main: handle_ser_child:"
" failed to change socket watch events\n");
io_watch_del(&io_h, tcpconn->s, -1, IO_FD_CLOSING);
tcpconn->flags&=~F_CONN_READ_W;
if (tcpconn_try_unhash(tcpconn))
tcpconn_put_destroy(tcpconn);
break;
}
}
}
}else{
LOG(L_WARN, "tcp_main: handler_ser_child: connection %p"
" already watched for write\n", tcpconn);
}
break;
#ifdef TCP_CONNECT_WAIT
case CONN_NEW_COMPLETE:
case CONN_NEW_PENDING_WRITE:
/* received when a pending connect completes in the same
* tcp_send() that initiated it
* the connection is already in the hash with F_CONN_PENDING
* flag (added by tcp_send()) and refcnt at least 1 (for the
* hash)*/
tcpconn->flags&=~(F_CONN_PENDING|F_CONN_FD_CLOSED);
if (unlikely((tcpconn->state==S_CONN_BAD) || (fd==-1))){
if (unlikely(fd==-1))
LOG(L_CRIT, "BUG: handle_ser_child: CONN_NEW_COMPLETE:"
" no fd received\n");
else
LOG(L_WARN, "WARNING: handle_ser_child: CONN_NEW_COMPLETE:"
" received connection with error\n");
tcpconn->flags|=F_CONN_FD_CLOSED;
tcpconn->state=S_CONN_BAD;
tcpconn_try_unhash(tcpconn);
tcpconn_put_destroy(tcpconn);
break;
}
(*tcp_connections_no)++;
tcpconn->s=fd;
/* update the timeout*/
t=get_ticks_raw();
con_lifetime=cfg_get(tcp, tcp_cfg, con_lifetime);
tcpconn->timeout=t+con_lifetime;
nxt_timeout=con_lifetime;
if (unlikely(cmd==CONN_NEW_COMPLETE)){
/* check if needs to be watched for write */
lock_get(&tcpconn->write_lock);
/* if queue non empty watch it for write */
flags=(_wbufq_empty(tcpconn)-1)&POLLOUT;
lock_release(&tcpconn->write_lock);
if (flags){
if (TICKS_LT(tcpconn->wbuf_q.wr_timeout, tcpconn->timeout)
&& TICKS_LT(t, tcpconn->wbuf_q.wr_timeout))
nxt_timeout=tcpconn->wbuf_q.wr_timeout-t;
tcpconn->flags|=F_CONN_WRITE_W|F_CONN_WANTS_WR;
}
/* activate the timer (already properly init. in
tcpconn_new()) no need for reinit */
local_timer_add(&tcp_main_ltimer, &tcpconn->timer, nxt_timeout,
t);
tcpconn->flags|=F_CONN_MAIN_TIMER|F_CONN_READ_W|
F_CONN_WANTS_RD;
}else{
/* CONN_NEW_PENDING_WRITE */
/* no need to check, we have something queued for write */
flags=POLLOUT;
if (TICKS_LT(tcpconn->wbuf_q.wr_timeout, tcpconn->timeout)
&& TICKS_LT(t, tcpconn->wbuf_q.wr_timeout))
nxt_timeout=tcpconn->wbuf_q.wr_timeout-t;
/* activate the timer (already properly init. in
tcpconn_new()) no need for reinit */
local_timer_add(&tcp_main_ltimer, &tcpconn->timer, nxt_timeout,
t);
tcpconn->flags|=F_CONN_MAIN_TIMER|F_CONN_READ_W|
F_CONN_WANTS_RD |
F_CONN_WRITE_W|F_CONN_WANTS_WR;
}
flags|=POLLIN;
if (unlikely(
io_watch_add(&io_h, tcpconn->s, flags,
F_TCPCONN, tcpconn)<0)){
LOG(L_CRIT, "ERROR: tcp_main: handle_ser_child: failed to add"
" new socket to the fd list\n");
tcpconn->flags&=~(F_CONN_WRITE_W|F_CONN_READ_W);
tcpconn_try_unhash(tcpconn); /* unhash & dec refcnt */
tcpconn_put_destroy(tcpconn);
}
break;
#endif /* TCP_CONNECT_WAIT */
#endif /* TCP_ASYNC */
default:
LOG(L_CRIT, "BUG: handle_ser_child: unknown cmd %d\n", cmd);
}
end:
return ret;
error:
return -1;
}
/* sends a tcpconn + fd to a choosen child */
inline static int send2child(struct tcp_connection* tcpconn)
{
int i;
int min_busy;
int idx;
static int crt=0; /* current child */
int last;
min_busy=tcp_children[0].busy;
idx=0;
last=crt+tcp_children_no;
for (; crt<last; crt++){
i=crt%tcp_children_no;
if (!tcp_children[i].busy){
idx=i;
min_busy=0;
break;
}else if (min_busy>tcp_children[i].busy){
min_busy=tcp_children[i].busy;
idx=i;
}
}
crt=idx+1; /* next time we start with crt%tcp_children_no */
tcp_children[idx].busy++;
tcp_children[idx].n_reqs++;
if (unlikely(min_busy)){
DBG("WARNING: send2child: no free tcp receiver, "
" connection passed to the least busy one (%d)\n",
min_busy);
}
DBG("send2child: to tcp child %d %d(%d), %p\n", idx,
tcp_children[idx].proc_no,
tcp_children[idx].pid, tcpconn);
/* first make sure this child doesn't have pending request for
* tcp_main (to avoid a possible deadlock: e.g. child wants to
* send a release command, but the master fills its socket buffer
* with new connection commands => deadlock) */
/* answer tcp_send requests first */
while(handle_ser_child(&pt[tcp_children[idx].proc_no], -1)>0);
/* process tcp readers requests */
while(handle_tcp_child(&tcp_children[idx], -1)>0);
#ifdef SEND_FD_QUEUE
/* if queue full, try to queue the io */
if (unlikely(send_fd(tcp_children[idx].unix_sock, &tcpconn,
sizeof(tcpconn), tcpconn->s)<=0)){
if ((errno==EAGAIN)||(errno==EWOULDBLOCK)){
/* FIXME: remove after debugging */
LOG(L_CRIT, "INFO: tcp child %d, socket %d: queue full,"
" %d requests queued (total handled %d)\n",
idx, tcp_children[idx].unix_sock, min_busy,
tcp_children[idx].n_reqs-1);
if (send_fd_queue_add(&send2child_q, tcp_children[idx].unix_sock,
tcpconn)!=0){
LOG(L_ERR, "ERROR: send2child: queue send op. failed\n");
return -1;
}
}else{
LOG(L_ERR, "ERROR: send2child: send_fd failed\n");
return -1;
}
}
#else
if (unlikely(send_fd(tcp_children[idx].unix_sock, &tcpconn,
sizeof(tcpconn), tcpconn->s)<=0)){
LOG(L_ERR, "ERROR: send2child: send_fd failed\n");
return -1;
}
#endif
return 0;
}
/* handles a new connection, called internally by tcp_main_loop/handle_io.
* params: si - pointer to one of the tcp socket_info structures on which
* an io event was detected (connection attempt)
* returns: handle_* return convention: -1 on error, 0 on EAGAIN (no more
* io events queued), >0 on success. success/error refer only to
* the accept.
*/
static inline int handle_new_connect(struct socket_info* si)
{
union sockaddr_union su;
union sockaddr_union sock_name;
unsigned sock_name_len;
union sockaddr_union* dst_su;
struct tcp_connection* tcpconn;
socklen_t su_len;
int new_sock;
/* got a connection on r */
su_len=sizeof(su);
new_sock=accept(si->socket, &(su.s), &su_len);
if (unlikely(new_sock==-1)){
if ((errno==EAGAIN)||(errno==EWOULDBLOCK))
return 0;
LOG(L_ERR, "WARNING: handle_new_connect: error while accepting"
" connection(%d): %s\n", errno, strerror(errno));
return -1;
}
if (unlikely(*tcp_connections_no>=cfg_get(tcp, tcp_cfg, max_connections))){
LOG(L_ERR, "ERROR: maximum number of connections exceeded: %d/%d\n",
*tcp_connections_no,
cfg_get(tcp, tcp_cfg, max_connections));
close(new_sock);
TCP_STATS_LOCAL_REJECT();
return 1; /* success, because the accept was succesfull */
}
if (unlikely(init_sock_opt_accept(new_sock)<0)){
LOG(L_ERR, "ERROR: handle_new_connect: init_sock_opt failed\n");
close(new_sock);
return 1; /* success, because the accept was succesfull */
}
(*tcp_connections_no)++;
TCP_STATS_ESTABLISHED(S_CONN_ACCEPT);
dst_su=&si->su;
if (unlikely(si->flags & SI_IS_ANY)){
/* INADDR_ANY => get local dst */
sock_name_len=sizeof(sock_name);
if (getsockname(new_sock, &sock_name.s, &sock_name_len)!=0){
LOG(L_ERR, "ERROR: handle_new_connect:"
" getsockname failed: %s(%d)\n",
strerror(errno), errno);
/* go on with the 0.0.0.0 dst from the sock_info */
}else{
dst_su=&sock_name;
}
}
/* add socket to list */
tcpconn=tcpconn_new(new_sock, &su, dst_su, si, si->proto, S_CONN_ACCEPT);
if (likely(tcpconn)){
tcpconn->flags|=F_CONN_PASSIVE;
#ifdef TCP_PASS_NEW_CONNECTION_ON_DATA
atomic_set(&tcpconn->refcnt, 1); /* safe, not yet available to the
outside world */
tcpconn_add(tcpconn);
/* activate the timer */
local_timer_add(&tcp_main_ltimer, &tcpconn->timer,
cfg_get(tcp, tcp_cfg, con_lifetime),
get_ticks_raw());
tcpconn->flags|=(F_CONN_MAIN_TIMER|F_CONN_READ_W|F_CONN_WANTS_RD);
if (unlikely(io_watch_add(&io_h, tcpconn->s, POLLIN,
F_TCPCONN, tcpconn)<0)){
LOG(L_CRIT, "ERROR: tcp_main: handle_new_connect: failed to add"
" new socket to the fd list\n");
tcpconn->flags&=~F_CONN_READ_W;
if (tcpconn_try_unhash(tcpconn))
tcpconn_put_destroy(tcpconn);
}
#else
atomic_set(&tcpconn->refcnt, 2); /* safe, not yet available to the
outside world */
/* prepare it for passing to a child */
tcpconn->flags|=F_CONN_READER;
tcpconn_add(tcpconn);
DBG("handle_new_connect: new connection from %s: %p %d flags: %04x\n",
su2a(&su, sizeof(su)), tcpconn, tcpconn->s, tcpconn->flags);
if(unlikely(send2child(tcpconn)<0)){
LOG(L_ERR,"ERROR: handle_new_connect: no children "
"available\n");
tcpconn->flags&=~F_CONN_READER;
tcpconn_put(tcpconn);
tcpconn_try_unhash(tcpconn);
tcpconn_put_destroy(tcpconn);
}
#endif
}else{ /*tcpconn==0 */
LOG(L_ERR, "ERROR: handle_new_connect: tcpconn_new failed, "
"closing socket\n");
close(new_sock);
(*tcp_connections_no)--;
}
return 1; /* accept() was succesfull */
}
/* handles an io event on one of the watched tcp connections
*
* params: tcpconn - pointer to the tcp_connection for which we have an io ev.
* fd_i - index in the fd_array table (needed for delete)
* returns: handle_* return convention, but on success it always returns 0
* (because it's one-shot, after a succesful execution the fd is
* removed from tcp_main's watch fd list and passed to a child =>
* tcp_main is not interested in further io events that might be
* queued for this fd)
*/
inline static int handle_tcpconn_ev(struct tcp_connection* tcpconn, short ev,
int fd_i)
{
#ifdef TCP_ASYNC
int empty_q;
int bytes;
#endif /* TCP_ASYNC */
/* is refcnt!=0 really necessary?
* No, in fact it's a bug: I can have the following situation: a send only
* tcp connection used by n processes simultaneously => refcnt = n. In
* the same time I can have a read event and this situation is perfectly
* valid. -- andrei
*/
#if 0
if ((tcpconn->refcnt!=0)){
/* FIXME: might be valid for sigio_rt iff fd flags are not cleared
* (there is a short window in which it could generate a sig
* that would be catched by tcp_main) */
LOG(L_CRIT, "BUG: handle_tcpconn_ev: io event on referenced"
" tcpconn (%p), refcnt=%d, fd=%d\n",
tcpconn, tcpconn->refcnt, tcpconn->s);
return -1;
}
#endif
/* pass it to child, so remove it from the io watch list and the local
* timer */
#ifdef TCP_ASYNC
empty_q=0; /* warning fix */
if (unlikely((ev & (POLLOUT|POLLERR|POLLHUP)) &&
(tcpconn->flags & F_CONN_WRITE_W))){
if (unlikely((ev & (POLLERR|POLLHUP)) ||
(wbufq_run(tcpconn->s, tcpconn, &empty_q)<0) ||
(empty_q && tcpconn_close_after_send(tcpconn))
)){
if (unlikely(io_watch_del(&io_h, tcpconn->s, fd_i, 0)<0)){
LOG(L_ERR, "ERROR: handle_tcpconn_ev: io_watch_del(1) failed:"
" for %p, fd %d\n", tcpconn, tcpconn->s);
}
if ((tcpconn->flags & F_CONN_READ_W) && (ev & POLLIN)){
/* connection is watched for read and there is a read event
* (unfortunately if we have POLLIN here we don't know if
* there's really any data in the read buffer or the POLLIN
* was generated by the error or EOF => to avoid loosing
* data it's safer to either directly check the read buffer
* or try a read)*/
/* in most cases the read buffer will be empty, so in general
* is cheaper to check it here and then send the
* conn. to a a child only if needed (another syscall + at
* least 2 * syscalls in the reader + ...) */
if ((ioctl(tcpconn->s, FIONREAD, &bytes)>=0) && (bytes>0)){
tcpconn->flags&=~(F_CONN_WRITE_W|F_CONN_READ_W|
F_CONN_WANTS_RD|F_CONN_WANTS_WR);
tcpconn->flags|=F_CONN_FORCE_EOF|F_CONN_WR_ERROR;
goto send_to_child;
}
/* if bytes==0 or ioctl failed, destroy the connection now */
}
tcpconn->flags&=~(F_CONN_WRITE_W|F_CONN_READ_W|
F_CONN_WANTS_RD|F_CONN_WANTS_WR);
if (unlikely(ev & POLLERR)){
if (unlikely(tcpconn->state==S_CONN_CONNECT)){
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT, tcpconn->rcv.proto,
&tcpconn->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_ERR(0, TCP_LADDR(tcpconn),
TCP_LPORT(tcpconn), TCP_PSU(tcpconn),
TCP_PROTO(tcpconn));
TCP_STATS_CONNECT_FAILED();
}else{
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_SEND, tcpconn->rcv.proto,
&tcpconn->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
TCP_STATS_CON_RESET(); /* FIXME: it could != RST */
}
}
if (unlikely(!tcpconn_try_unhash(tcpconn))){
LOG(L_CRIT, "BUG: tcpconn_ev: unhashed connection %p\n",
tcpconn);
}
tcpconn_put_destroy(tcpconn);
goto error;
}
if (empty_q){
tcpconn->flags&=~F_CONN_WANTS_WR;
if (!(tcpconn->flags & F_CONN_READ_W)){
if (unlikely(io_watch_del(&io_h, tcpconn->s, fd_i, 0)==-1)){
LOG(L_ERR, "ERROR: handle_tcpconn_ev: io_watch_del(2)"
" failed:" " for %p, fd %d\n",
tcpconn, tcpconn->s);
goto error;
}
}else{
if (unlikely(io_watch_chg(&io_h, tcpconn->s,
POLLIN, fd_i)==-1)){
LOG(L_ERR, "ERROR: handle_tcpconn_ev: io_watch_chg(1)"
" failed:" " for %p, fd %d\n",
tcpconn, tcpconn->s);
goto error;
}
}
tcpconn->flags&=~F_CONN_WRITE_W;
}
ev&=~POLLOUT; /* clear POLLOUT */
}
if (likely(ev && (tcpconn->flags & F_CONN_READ_W))){
/* if still some other IO event (POLLIN|POLLHUP|POLLERR) and
* connection is still watched in tcp_main for reads, send it to a
* child and stop watching it for input (but continue watching for
* writes if needed): */
if (unlikely(tcpconn->flags & F_CONN_WRITE_W)){
if (unlikely(io_watch_chg(&io_h, tcpconn->s, POLLOUT, fd_i)==-1)){
LOG(L_ERR, "ERROR: handle_tcpconn_ev: io_watch_chg(2)"
" failed:" " for %p, fd %d\n",
tcpconn, tcpconn->s);
goto error;
}
}else
#else
{
#endif /* TCP_ASYNC */
if (unlikely(io_watch_del(&io_h, tcpconn->s, fd_i, 0)==-1)){
LOG(L_ERR, "ERROR: handle_tcpconn_ev: io_watch_del(3)"
" failed:" " for %p, fd %d\n",
tcpconn, tcpconn->s);
goto error;
}
#ifdef TCP_ASYNC
send_to_child:
#endif
DBG("tcp: DBG: sendig to child, events %x\n", ev);
#ifdef POLLRDHUP
tcpconn->flags|=((int)!(ev & (POLLRDHUP|POLLHUP|POLLERR)) -1) &
F_CONN_EOF_SEEN;
#else /* POLLRDHUP */
tcpconn->flags|=((int)!(ev & (POLLHUP|POLLERR)) -1) & F_CONN_EOF_SEEN;
#endif /* POLLRDHUP */
tcpconn->flags|= ((int)!(ev & POLLPRI) -1) & F_CONN_OOB_DATA;
tcpconn->flags|=F_CONN_READER;
local_timer_del(&tcp_main_ltimer, &tcpconn->timer);
tcpconn->flags&=~(F_CONN_MAIN_TIMER|F_CONN_READ_W|F_CONN_WANTS_RD);
tcpconn_ref(tcpconn); /* refcnt ++ */
if (unlikely(send2child(tcpconn)<0)){
LOG(L_ERR,"ERROR: handle_tcpconn_ev: no children available\n");
tcpconn->flags&=~F_CONN_READER;
#ifdef TCP_ASYNC
if (tcpconn->flags & F_CONN_WRITE_W){
if (unlikely(io_watch_del(&io_h, tcpconn->s, fd_i, 0)<0)){
LOG(L_ERR, "ERROR: handle_tcpconn_ev: io_watch_del(4)"
" failed:" " for %p, fd %d\n",
tcpconn, tcpconn->s);
}
tcpconn->flags&=~F_CONN_WRITE_W;
}
#endif /* TCP_ASYNC */
tcpconn_put(tcpconn);
tcpconn_try_unhash(tcpconn);
tcpconn_put_destroy(tcpconn); /* because of the tcpconn_ref() */
}
}
return 0; /* we are not interested in possibly queued io events,
the fd was either passed to a child, closed, or for writes,
everything possible was already written */
error:
return -1;
}
/* generic handle io routine, it will call the appropiate
* handle_xxx() based on the fd_map type
*
* params: fm - pointer to a fd hash entry
* idx - index in the fd_array (or -1 if not known)
* return: -1 on error
* 0 on EAGAIN or when by some other way it is known that no more
* io events are queued on the fd (the receive buffer is empty).
* Usefull to detect when there are no more io events queued for
* sigio_rt, epoll_et, kqueue.
* >0 on successfull read from the fd (when there might be more io
* queued -- the receive buffer might still be non-empty)
*/
inline static int handle_io(struct fd_map* fm, short ev, int idx)
{
int ret;
/* update the local config */
cfg_update();
switch(fm->type){
case F_SOCKINFO:
ret=handle_new_connect((struct socket_info*)fm->data);
break;
case F_TCPCONN:
ret=handle_tcpconn_ev((struct tcp_connection*)fm->data, ev, idx);
break;
case F_TCPCHILD:
ret=handle_tcp_child((struct tcp_child*)fm->data, idx);
break;
case F_PROC:
ret=handle_ser_child((struct process_table*)fm->data, idx);
break;
case F_NONE:
LOG(L_CRIT, "BUG: handle_io: empty fd map: %p {%d, %d, %p},"
" idx %d\n", fm, fm->fd, fm->type, fm->data, idx);
goto error;
default:
LOG(L_CRIT, "BUG: handle_io: uknown fd type %d\n", fm->type);
goto error;
}
return ret;
error:
return -1;
}
/* timer handler for tcpconnection handled by tcp_main */
static ticks_t tcpconn_main_timeout(ticks_t t, struct timer_ln* tl, void* data)
{
struct tcp_connection *c;
int fd;
int tcp_async;
c=(struct tcp_connection*)data;
/* or (struct tcp...*)(tl-offset(c->timer)) */
#ifdef TCP_ASYNC
DBG( "tcp_main: entering timer for %p (ticks=%d, timeout=%d (%d s), "
"wr_timeout=%d (%d s)), write queue: %d bytes\n",
c, t, c->timeout, TICKS_TO_S(c->timeout-t),
c->wbuf_q.wr_timeout, TICKS_TO_S(c->wbuf_q.wr_timeout-t),
c->wbuf_q.queued);
tcp_async=cfg_get(tcp, tcp_cfg, async);
if (likely(TICKS_LT(t, c->timeout) && ( !tcp_async | _wbufq_empty(c) |
TICKS_LT(t, c->wbuf_q.wr_timeout)) )){
if (unlikely(tcp_async && _wbufq_non_empty(c)))
return (ticks_t)MIN_unsigned(c->timeout-t, c->wbuf_q.wr_timeout-t);
else
return (ticks_t)(c->timeout - t);
}
/* if time out due to write, add it to the blacklist */
if (tcp_async && _wbufq_non_empty(c) && TICKS_GE(t, c->wbuf_q.wr_timeout)){
if (unlikely(c->state==S_CONN_CONNECT)){
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_CONNECT, c->rcv.proto,
&c->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_CONNECT_TIMEOUT(0, TCP_LADDR(c), TCP_LPORT(c), TCP_PSU(c),
TCP_PROTO(c));
TCP_STATS_CONNECT_FAILED();
}else{
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist))
dst_blacklist_su(BLST_ERR_SEND, c->rcv.proto,
&c->rcv.src_su, 0);
#endif /* USE_DST_BLACKLIST */
TCP_EV_SEND_TIMEOUT(0, &c->rcv);
TCP_STATS_SEND_TIMEOUT();
}
}else{
/* idle timeout */
TCP_EV_IDLE_CONN_CLOSED(0, &c->rcv);
TCP_STATS_CON_TIMEOUT();
}
#else /* ! TCP_ASYNC */
if (TICKS_LT(t, c->timeout)){
/* timeout extended, exit */
return (ticks_t)(c->timeout - t);
}
/* idle timeout */
TCP_EV_IDLE_CONN_CLOSED(0, &c->rcv);
TCP_STATS_CON_TIMEOUT();
#endif /* TCP_ASYNC */
DBG("tcp_main: timeout for %p\n", c);
if (likely(c->flags & F_CONN_HASHED)){
c->flags&=~(F_CONN_HASHED|F_CONN_MAIN_TIMER);
c->state=S_CONN_BAD;
TCPCONN_LOCK;
_tcpconn_detach(c);
TCPCONN_UNLOCK;
}else{
c->flags&=~F_CONN_MAIN_TIMER;
LOG(L_CRIT, "BUG: tcp_main: timer: called with unhashed connection %p"
"\n", c);
tcpconn_ref(c); /* ugly hack to try to go on */
}
fd=c->s;
if (likely(fd>0)){
if (likely(c->flags & (F_CONN_READ_W|F_CONN_WRITE_W))){
io_watch_del(&io_h, fd, -1, IO_FD_CLOSING);
c->flags&=~(F_CONN_READ_W|F_CONN_WRITE_W);
}
}
tcpconn_put_destroy(c);
return 0;
}
static inline void tcp_timer_run()
{
ticks_t ticks;
ticks=get_ticks_raw();
if (unlikely((ticks-tcp_main_prev_ticks)<TCPCONN_TIMEOUT_MIN_RUN)) return;
tcp_main_prev_ticks=ticks;
local_timer_run(&tcp_main_ltimer, ticks);
}
/* keep in sync with tcpconn_destroy, the "delete" part should be
* the same except for io_watch_del..
* Note: this function is called only on shutdown by the main ser process via
* cleanup(). However it's also safe to call it from the tcp_main process.
* => with the ser shutdown exception, it cannot execute in parallel
* with tcpconn_add() or tcpconn_destroy()*/
static inline void tcpconn_destroy_all()
{
struct tcp_connection *c, *next;
unsigned h;
int fd;
TCPCONN_LOCK;
for(h=0; h<TCP_ID_HASH_SIZE; h++){
c=tcpconn_id_hash[h];
while(c){
next=c->id_next;
if (is_tcp_main){
/* we cannot close or remove the fd if we are not in the
* tcp main proc.*/
if ((c->flags & F_CONN_MAIN_TIMER)){
local_timer_del(&tcp_main_ltimer, &c->timer);
c->flags&=~F_CONN_MAIN_TIMER;
} /* else still in some reader */
fd=c->s;
if (fd>0 && (c->flags & (F_CONN_READ_W|F_CONN_WRITE_W))){
io_watch_del(&io_h, fd, -1, IO_FD_CLOSING);
c->flags&=~(F_CONN_READ_W|F_CONN_WRITE_W);
}
}else{
fd=-1;
}
#ifdef USE_TLS
if (fd>0 && c->type==PROTO_TLS)
tls_close(c, fd);
#endif
_tcpconn_rm(c);
if (fd>0) {
#ifdef TCP_FD_CACHE
if (likely(cfg_get(tcp, tcp_cfg, fd_cache)))
shutdown(fd, SHUT_RDWR);
#endif /* TCP_FD_CACHE */
close(fd);
}
(*tcp_connections_no)--;
c=next;
}
}
TCPCONN_UNLOCK;
}
/* tcp main loop */
void tcp_main_loop()
{
struct socket_info* si;
int r;
is_tcp_main=1; /* mark this process as tcp main */
tcp_main_max_fd_no=get_max_open_fds();
/* init send fd queues (here because we want mem. alloc only in the tcp
* process */
#ifdef SEND_FD_QUEUE
if (init_send_fd_queues()<0){
LOG(L_CRIT, "ERROR: init_tcp: could not init send fd queues\n");
goto error;
}
#endif
/* init io_wait (here because we want the memory allocated only in
* the tcp_main process) */
if (init_io_wait(&io_h, tcp_main_max_fd_no, tcp_poll_method)<0)
goto error;
/* init: start watching all the fds*/
/* init local timer */
tcp_main_prev_ticks=get_ticks_raw();
if (init_local_timer(&tcp_main_ltimer, get_ticks_raw())!=0){
LOG(L_ERR, "ERROR: init_tcp: failed to init local timer\n");
goto error;
}
#ifdef TCP_FD_CACHE
if (cfg_get(tcp, tcp_cfg, fd_cache)) tcp_fd_cache_init();
#endif /* TCP_FD_CACHE */
/* add all the sockets we listen on for connections */
for (si=tcp_listen; si; si=si->next){
if ((si->proto==PROTO_TCP) &&(si->socket!=-1)){
if (io_watch_add(&io_h, si->socket, POLLIN, F_SOCKINFO, si)<0){
LOG(L_CRIT, "ERROR: tcp_main_loop: init: failed to add "
"listen socket to the fd list\n");
goto error;
}
}else{
LOG(L_CRIT, "BUG: tcp_main_loop: non tcp address in tcp_listen\n");
}
}
#ifdef USE_TLS
if (!tls_disable && tls_loaded()){
for (si=tls_listen; si; si=si->next){
if ((si->proto==PROTO_TLS) && (si->socket!=-1)){
if (io_watch_add(&io_h, si->socket, POLLIN, F_SOCKINFO, si)<0){
LOG(L_CRIT, "ERROR: tcp_main_loop: init: failed to add "
"tls listen socket to the fd list\n");
goto error;
}
}else{
LOG(L_CRIT, "BUG: tcp_main_loop: non tls address"
" in tls_listen\n");
}
}
}
#endif
/* add all the unix sockets used for communcation with other ser processes
* (get fd, new connection a.s.o) */
for (r=1; r<process_no; r++){
if (pt[r].unix_sock>0) /* we can't have 0, we never close it!*/
if (io_watch_add(&io_h, pt[r].unix_sock, POLLIN,F_PROC, &pt[r])<0){
LOG(L_CRIT, "ERROR: tcp_main_loop: init: failed to add "
"process %d unix socket to the fd list\n", r);
goto error;
}
}
/* add all the unix sokets used for communication with the tcp childs */
for (r=0; r<tcp_children_no; r++){
if (tcp_children[r].unix_sock>0)/*we can't have 0, we never close it!*/
if (io_watch_add(&io_h, tcp_children[r].unix_sock, POLLIN,
F_TCPCHILD, &tcp_children[r]) <0){
LOG(L_CRIT, "ERROR: tcp_main_loop: init: failed to add "
"tcp child %d unix socket to the fd list\n", r);
goto error;
}
}
/* initialize the cfg framework */
if (cfg_child_init()) goto error;
/* main loop */
switch(io_h.poll_method){
case POLL_POLL:
while(1){
/* wait and process IO */
io_wait_loop_poll(&io_h, TCP_MAIN_SELECT_TIMEOUT, 0);
send_fd_queue_run(&send2child_q); /* then new io */
/* remove old connections */
tcp_timer_run();
}
break;
#ifdef HAVE_SELECT
case POLL_SELECT:
while(1){
io_wait_loop_select(&io_h, TCP_MAIN_SELECT_TIMEOUT, 0);
send_fd_queue_run(&send2child_q); /* then new io */
tcp_timer_run();
}
break;
#endif
#ifdef HAVE_SIGIO_RT
case POLL_SIGIO_RT:
while(1){
io_wait_loop_sigio_rt(&io_h, TCP_MAIN_SELECT_TIMEOUT);
send_fd_queue_run(&send2child_q); /* then new io */
tcp_timer_run();
}
break;
#endif
#ifdef HAVE_EPOLL
case POLL_EPOLL_LT:
while(1){
io_wait_loop_epoll(&io_h, TCP_MAIN_SELECT_TIMEOUT, 0);
send_fd_queue_run(&send2child_q); /* then new io */
tcp_timer_run();
}
break;
case POLL_EPOLL_ET:
while(1){
io_wait_loop_epoll(&io_h, TCP_MAIN_SELECT_TIMEOUT, 1);
send_fd_queue_run(&send2child_q); /* then new io */
tcp_timer_run();
}
break;
#endif
#ifdef HAVE_KQUEUE
case POLL_KQUEUE:
while(1){
io_wait_loop_kqueue(&io_h, TCP_MAIN_SELECT_TIMEOUT, 0);
send_fd_queue_run(&send2child_q); /* then new io */
tcp_timer_run();
}
break;
#endif
#ifdef HAVE_DEVPOLL
case POLL_DEVPOLL:
while(1){
io_wait_loop_devpoll(&io_h, TCP_MAIN_SELECT_TIMEOUT, 0);
send_fd_queue_run(&send2child_q); /* then new io */
tcp_timer_run();
}
break;
#endif
default:
LOG(L_CRIT, "BUG: tcp_main_loop: no support for poll method "
" %s (%d)\n",
poll_method_name(io_h.poll_method), io_h.poll_method);
goto error;
}
error:
#ifdef SEND_FD_QUEUE
destroy_send_fd_queues();
#endif
destroy_io_wait(&io_h);
LOG(L_CRIT, "ERROR: tcp_main_loop: exiting...");
exit(-1);
}
/* cleanup before exit */
void destroy_tcp()
{
if (tcpconn_id_hash){
if (tcpconn_lock)
TCPCONN_UNLOCK; /* hack: force-unlock the tcp lock in case
some process was terminated while holding
it; this will allow an almost gracious
shutdown */
tcpconn_destroy_all();
shm_free(tcpconn_id_hash);
tcpconn_id_hash=0;
}
DESTROY_TCP_STATS();
if (tcp_connections_no){
shm_free(tcp_connections_no);
tcp_connections_no=0;
}
#ifdef TCP_ASYNC
if (tcp_total_wq){
shm_free(tcp_total_wq);
tcp_total_wq=0;
}
#endif /* TCP_ASYNC */
if (connection_id){
shm_free(connection_id);
connection_id=0;
}
if (tcpconn_aliases_hash){
shm_free(tcpconn_aliases_hash);
tcpconn_aliases_hash=0;
}
if (tcpconn_lock){
lock_destroy(tcpconn_lock);
lock_dealloc((void*)tcpconn_lock);
tcpconn_lock=0;
}
if (tcp_children){
pkg_free(tcp_children);
tcp_children=0;
}
destroy_local_timer(&tcp_main_ltimer);
}
int init_tcp()
{
char* poll_err;
tcp_options_check();
if (tcp_cfg==0){
BUG("tcp_cfg not initialized\n");
goto error;
}
/* init lock */
tcpconn_lock=lock_alloc();
if (tcpconn_lock==0){
LOG(L_CRIT, "ERROR: init_tcp: could not alloc lock\n");
goto error;
}
if (lock_init(tcpconn_lock)==0){
LOG(L_CRIT, "ERROR: init_tcp: could not init lock\n");
lock_dealloc((void*)tcpconn_lock);
tcpconn_lock=0;
goto error;
}
/* init globals */
tcp_connections_no=shm_malloc(sizeof(int));
if (tcp_connections_no==0){
LOG(L_CRIT, "ERROR: init_tcp: could not alloc globals\n");
goto error;
}
*tcp_connections_no=0;
if (INIT_TCP_STATS()!=0) goto error;
connection_id=shm_malloc(sizeof(int));
if (connection_id==0){
LOG(L_CRIT, "ERROR: init_tcp: could not alloc globals\n");
goto error;
}
*connection_id=1;
#ifdef TCP_ASYNC
tcp_total_wq=shm_malloc(sizeof(*tcp_total_wq));
if (tcp_total_wq==0){
LOG(L_CRIT, "ERROR: init_tcp: could not alloc globals\n");
goto error;
}
#endif /* TCP_ASYNC */
/* alloc hashtables*/
tcpconn_aliases_hash=(struct tcp_conn_alias**)
shm_malloc(TCP_ALIAS_HASH_SIZE* sizeof(struct tcp_conn_alias*));
if (tcpconn_aliases_hash==0){
LOG(L_CRIT, "ERROR: init_tcp: could not alloc address hashtable\n");
goto error;
}
tcpconn_id_hash=(struct tcp_connection**)shm_malloc(TCP_ID_HASH_SIZE*
sizeof(struct tcp_connection*));
if (tcpconn_id_hash==0){
LOG(L_CRIT, "ERROR: init_tcp: could not alloc id hashtable\n");
goto error;
}
/* init hashtables*/
memset((void*)tcpconn_aliases_hash, 0,
TCP_ALIAS_HASH_SIZE * sizeof(struct tcp_conn_alias*));
memset((void*)tcpconn_id_hash, 0,
TCP_ID_HASH_SIZE * sizeof(struct tcp_connection*));
/* fix config variables */
poll_err=check_poll_method(tcp_poll_method);
/* set an appropriate poll method */
if (poll_err || (tcp_poll_method==0)){
tcp_poll_method=choose_poll_method();
if (poll_err){
LOG(L_ERR, "ERROR: init_tcp: %s, using %s instead\n",
poll_err, poll_method_name(tcp_poll_method));
}else{
LOG(L_INFO, "init_tcp: using %s as the io watch method"
" (auto detected)\n", poll_method_name(tcp_poll_method));
}
}else{
LOG(L_INFO, "init_tcp: using %s io watch method (config)\n",
poll_method_name(tcp_poll_method));
}
return 0;
error:
/* clean-up */
destroy_tcp();
return -1;
}
#ifdef TCP_CHILD_NON_BLOCKING
/* returns -1 on error */
static int set_non_blocking(int s)
{
int flags;
/* non-blocking */
flags=fcntl(s, F_GETFL);
if (flags==-1){
LOG(L_ERR, "ERROR: set_non_blocking: fnctl failed: (%d) %s\n",
errno, strerror(errno));
goto error;
}
if (fcntl(s, F_SETFL, flags|O_NONBLOCK)==-1){
LOG(L_ERR, "ERROR: set_non_blocking: fcntl: set non-blocking failed:"
" (%d) %s\n", errno, strerror(errno));
goto error;
}
return 0;
error:
return -1;
}
#endif
/* returns -1 on error, 0 on success */
int tcp_fix_child_sockets(int* fd)
{
#ifdef TCP_CHILD_NON_BLOCKING
if ((set_non_blocking(fd[0])<0) ||
(set_non_blocking(fd[1])<0)){
return -1;
}
#endif
return 0;
}
/* starts the tcp processes */
int tcp_init_children()
{
int r;
int reader_fd_1; /* for comm. with the tcp children read */
pid_t pid;
struct socket_info *si;
/* estimate max fd. no:
* 1 tcp send unix socket/all_proc,
* + 1 udp sock/udp proc + 1 tcp_child sock/tcp child*
* + no_listen_tcp */
for(r=0, si=tcp_listen; si; si=si->next, r++);
#ifdef USE_TLS
if (! tls_disable)
for (si=tls_listen; si; si=si->next, r++);
#endif
register_fds(r+tcp_max_connections+get_max_procs()-1 /* tcp main */);
#if 0
tcp_max_fd_no=get_max_procs()*2 +r-1 /* timer */ +3; /* stdin/out/err*/
/* max connections can be temporarily exceeded with estimated_process_count
* - tcp_main (tcpconn_connect called simultaneously in all all the
* processes) */
tcp_max_fd_no+=tcp_max_connections+get_max_procs()-1 /* tcp main */;
#endif
/* alloc the children array */
tcp_children=pkg_malloc(sizeof(struct tcp_child)*tcp_children_no);
if (tcp_children==0){
LOG(L_ERR, "ERROR: tcp_init_children: out of memory\n");
goto error;
}
/* create the tcp sock_info structures */
/* copy the sockets --moved to main_loop*/
/* fork children & create the socket pairs*/
for(r=0; r<tcp_children_no; r++){
child_rank++;
pid=fork_tcp_process(child_rank, "tcp receiver", r, &reader_fd_1);
if (pid<0){
LOG(L_ERR, "ERROR: tcp_main: fork failed: %s\n",
strerror(errno));
goto error;
}else if (pid>0){
/* parent */
}else{
/* child */
bind_address=0; /* force a SEGFAULT if someone uses a non-init.
bind address on tcp */
tcp_receive_loop(reader_fd_1);
}
}
return 0;
error:
return -1;
}
void tcp_get_info(struct tcp_gen_info *ti)
{
ti->tcp_readers=tcp_children_no;
ti->tcp_max_connections=tcp_max_connections;
ti->tcp_connections_no=*tcp_connections_no;
#ifdef TCP_ASYNC
ti->tcp_write_queued=*tcp_total_wq;
#else
ti->tcp_write_queued=0;
#endif /* TCP_ASYNC */
}
#endif