/*
* $Id$
*
* 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
*/
#ifdef USE_TCP
#ifndef SHM_MEM
#error "shared memory support needed (add -DSHM_MEM to Makefile.defs)"
#endif
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include "ip_addr.h"
#include "pass_fd.h"
#include "tcp_conn.h"
#include "globals.h"
#include "pt.h"
#include "mem/mem.h"
#include "mem/shm_mem.h"
#include "timer.h"
#include "tcp_server.h"
#include "tcp_init.h"
#define local_malloc pkg_malloc
#define local_free pkg_free
#define MAX_TCP_CHILDREN 100
struct tcp_child{
pid_t pid;
int unix_sock; /* unix sock fd, copied from pt*/
int busy;
int n_reqs; /* number of requests serviced so far */
};
struct tcp_connection** conn_list=0;
struct tcp_child tcp_children[MAX_TCP_CHILDREN];
static int connection_id=1; /* unique for each connection, used for
quickly finding the corresponding connection
for a reply */
int unix_tcp_sock;
struct tcp_connection* tcpconn_new(int sock, union sockaddr_union* su,
struct socket_info* ba)
{
struct tcp_connection *c;
c=(struct tcp_connection*)shm_malloc(sizeof(struct tcp_connection));
if (c==0){
LOG(L_ERR, "ERROR: tcpconn_add: mem. allocation failure\n");
goto error;
}
c->s=sock;
c->fd=sock;
c->rcv.src_su=*su;
c->refcnt=0;
su2ip_addr(&c->rcv.src_ip, su);
c->rcv.src_port=su_getport(su);
c->rcv.proto=PROTO_TCP;
c->rcv.bind_address=ba;
if (ba){
c->rcv.dst_ip=ba->address;
c->rcv.dst_port=ba->port_no;
}
init_tcp_req(&c->req);
c->timeout=get_ticks()+TCP_CON_TIMEOUT;
c->id=connection_id++;
c->rcv.proto_reserved1=0; /* this will be filled before receive_message*/
c->rcv.proto_reserved2=0;
return c;
error:
return 0;
}
struct tcp_connection* tcpconn_connect(union sockaddr_union* server)
{
int s;
s=socket(AF2PF(server->s.sa_family), SOCK_STREAM, 0);
if (s<0){
LOG(L_ERR, "ERROR: tcpconn_connect: socket: (%d) %s\n",
errno, strerror(errno));
goto error;
}
if (connect(s, &server->s, sockaddru_len(*server))<0){
LOG(L_ERR, "ERROR: tcpconn_connect: connect: (%d) %s\n",
errno, strerror(errno));
goto error;
}
return tcpconn_new(s, server, 0); /*FIXME: set sock idx! */
error:
return 0;
}
struct tcp_connection* tcpconn_add(struct tcp_connection *c)
{
TCPCONN_LOCK;
/* add it at the begining of the list*/
if (c) tcpconn_listadd(*conn_list, c, next, prev);
TCPCONN_UNLOCK;
return c;
}
void tcpconn_rm(struct tcp_connection* c)
{
TCPCONN_LOCK;
tcpconn_listrm(*conn_list, c, next, prev);
TCPCONN_UNLOCK;
shm_free(c);
}
/* finds a connection, if id=0 uses the ip addr & port */
struct tcp_connection* tcpconn_find(int id, struct ip_addr* ip, int port)
{
struct tcp_connection *c;
DBG("tcpconn_find: %d ",id ); print_ip(ip); DBG(" %d\n", ntohs(port));
for (c=*conn_list; c; c=c->next){
DBG("c=%p, c->id=%d, ip=",c, c->id);
print_ip(&c->rcv.src_ip);
DBG(" port=%d\n", ntohs(c->rcv.src_port));
if (id){
if (id==c->id) return c;
}else if (ip && (port==c->rcv.src_port)&&
(ip_addr_cmp(ip, &c->rcv.src_ip)))
return c;
}
return 0;
}
struct tcp_connection* tcpconn_get(int id, struct ip_addr* ip, int port)
{
struct tcp_connection* c;
TCPCONN_LOCK;
c=tcpconn_find(id, ip, port);
if (c) c->refcnt++;
TCPCONN_UNLOCK;
return c;
}
void tcpconn_put(struct tcp_connection* c)
{
c->refcnt--; /* FIXME: atomic_dec */
}
/* finds a tcpconn & sends on it */
int tcp_send(char* buf, unsigned len, union sockaddr_union* to, int id)
{
struct tcp_connection *c;
struct ip_addr ip;
int port;
long response[2];
int n;
port=0;
if (to){
su2ip_addr(&ip, to);
port=su_getport(to);
c=tcpconn_get(id, &ip, port); /* lock ;inc refcnt; unlock */
}else if (id){
c=tcpconn_get(id, 0, 0);
}else{
LOG(L_CRIT, "BUG: tcp_send called with null id & to\n");
return -1;
}
if (id){
if (c==0) {
if (to){
c=tcpconn_get(0, &ip, port); /* try again w/o id */
goto no_id;
}else{
LOG(L_ERR, "ERROR: tcp_send: id %d not found, dropping\n",
id);
return -1;
}
}else goto get_fd;
}
no_id:
if (c==0){
DBG("tcp_send: no open tcp connection found, opening new one\n");
/* create tcp connection */
if ((c=tcpconn_connect(to))==0){
LOG(L_ERR, "ERROR: tcp_send: connect failed\n");
return 0;
}
c->refcnt++;
/* send the new tcpconn to "tcp main" */
response[0]=(long)c;
response[1]=CONN_NEW;
n=write(unix_tcp_sock, response, sizeof(response));
n=send_fd(unix_tcp_sock, &c, sizeof(c), c->s);
goto send_it;
}
get_fd:
DBG("tcp_send: tcp connection found, acquiring fd\n");
/* get the fd */
response[0]=(long)c;
response[1]=CONN_GET_FD;
n=write(unix_tcp_sock, response, sizeof(response));
DBG("tcp_send, c= %p, n=%d\n", c, n);
n=receive_fd(unix_tcp_sock, &c, sizeof(c), &c->fd);
DBG("tcp_send: after receive_fd: c= %p n=%d fd=%d\n",c, n, c->fd);
send_it:
DBG("tcp_send: sending...\n");
n=write(c->fd, buf, len);
DBG("tcp_send: after write: c= %p n=%d fd=%d\n",c, n, c->fd);
close(c->fd);
tcpconn_put(c); /* release c (lock; dec refcnt; unlock) */
return n;
}
/* very ineficient for now, use hashtable some day - FIXME*/
void tcpconn_timeout(fd_set* set)
{
struct tcp_connection *c, *next;
int ticks;;
ticks=get_ticks();
c=*conn_list;
while(c){
next=c->next;
if ((c->refcnt==0) && (ticks>c->timeout)) {
DBG("tcpconn_timeout: timeout for %p (%d > %d)\n",
c, ticks, c->timeout);
if (c->s>0) {
FD_CLR(c->s, set);
close(c->s);
}
tcpconn_rm(c);
}
c=next;
}
}
int tcp_init(struct socket_info* sock_info)
{
union sockaddr_union* addr;
addr=&sock_info->su;
sock_info->proto=PROTO_TCP;
if (init_su(addr, &sock_info->address, htons(sock_info->port_no))<0){
LOG(L_ERR, "ERROR: tcp_init: could no init sockaddr_union\n");
goto error;
}
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;
}
if (bind(sock_info->socket, &addr->s, sockaddru_len(*addr))==-1){
LOG(L_ERR, "ERROR: tcp_init: bind(%x, %p, %d) on %s: %s\n",
sock_info->socket, &addr->s,
sockaddru_len(*addr),
sock_info->address_str.s,
strerror(errno));
goto error;
}
if (listen(sock_info->socket, 10)==-1){
LOG(L_ERR, "ERROR: tcp_init: listen(%x, %p, %d) on %s: %s\n",
sock_info->socket, &addr->s,
sockaddru_len(*addr),
sock_info->address_str.s,
strerror(errno));
goto error;
}
return 0;
error:
if (sock_info->socket!=-1){
close(sock_info->socket);
sock_info->socket=-1;
}
return -1;
}
static int send2child(struct tcp_connection* tcpconn)
{
int i;
int min_busy;
int idx;
min_busy=tcp_children[0].busy;
idx=0;
for (i=0; i<tcp_children_no; i++){
if (!tcp_children[i].busy){
idx=i;
min_busy=0;
break;
return 0;
}else if (min_busy>tcp_children[i].busy){
min_busy=tcp_children[i].busy;
idx=i;
}
}
tcp_children[idx].busy++;
tcp_children[idx].n_reqs++;
tcpconn->refcnt++;
if (min_busy){
LOG(L_WARN, "WARNING: send2child:no free tcp receiver, "
" connection passed to the least busy one (%d)\n",
min_busy);
}
DBG("send2child: to child %d, %ld\n", idx, (long)tcpconn);
send_fd(tcp_children[idx].unix_sock, &tcpconn, sizeof(tcpconn),
tcpconn->s);
return 0; /* just to fix a warning*/
}
void tcp_main_loop()
{
int r;
int n;
fd_set master_set;
fd_set sel_set;
int maxfd;
int new_sock;
union sockaddr_union su;
struct tcp_connection* tcpconn;
long response[2];
int cmd;
int bytes;
socklen_t su_len;
struct timeval timeout;
/*init */
maxfd=0;
FD_ZERO(&master_set);
/* set all the listen addresses */
for (r=0; r<sock_no; r++){
if ((tcp_info[r].proto==PROTO_TCP) &&(tcp_info[r].socket!=-1)){
FD_SET(tcp_info[r].socket, &master_set);
if (tcp_info[r].socket>maxfd) maxfd=tcp_info[r].socket;
}
}
/* set all the unix sockets used for child comm */
for (r=1; r<process_no; r++){
if (pt[r].unix_sock>0){ /* we can't have 0, we never close it!*/
FD_SET(pt[r].unix_sock, &master_set);
if (pt[r].unix_sock>maxfd) maxfd=pt[r].unix_sock;
}
}
/* main loop*/
while(1){
sel_set=master_set;
timeout.tv_sec=TCP_MAIN_SELECT_TIMEOUT;
timeout.tv_usec=0;
n=select(maxfd+1, &sel_set, 0 ,0 , &timeout);
if (n<0){
if (errno==EINTR) continue; /* just a signal */
/* errors */
LOG(L_ERR, "ERROR: tcp_main_loop: select:(%d) %s\n", errno,
strerror(errno));
n=0;
}
for (r=0; r<sock_no && n; r++){
if ((FD_ISSET(tcp_info[r].socket, &sel_set))){
/* got a connection on r */
su_len=sizeof(su);
new_sock=accept(tcp_info[r].socket, &(su.s), &su_len);
n--;
if (new_sock<0){
LOG(L_ERR, "WARNING: tcp_main_loop: error while accepting"
" connection(%d): %s\n", errno, strerror(errno));
continue;
}
/* add socket to list */
tcpconn=tcpconn_new(new_sock, &su, &tcp_info[r]);
if (tcpconn){
tcpconn_add(tcpconn);
DBG("tcp_main_loop: new connection: %p %d\n",
tcpconn, tcpconn->s);
/* pass it to a child */
if(send2child(tcpconn)<0){
LOG(L_ERR,"ERROR: tcp_main_loop: no children "
"available\n");
close(tcpconn->s);
tcpconn_rm(tcpconn);
}
}
}
}
/* check all the read fds (from the tcpconn list) */
for(tcpconn=*conn_list; tcpconn && n; tcpconn=tcpconn->next){
if ((tcpconn->refcnt==0)&&(FD_ISSET(tcpconn->s, &sel_set))){
/* new data available */
n--;
/* pass it to child, so remove it from select list */
DBG("tcp_main_loop: data available on %p %d\n",
tcpconn, tcpconn->s);
FD_CLR(tcpconn->s, &master_set);
if (send2child(tcpconn)<0){
LOG(L_ERR,"ERROR: tcp_main_loop: no children available\n");
close(tcpconn->s);
tcpconn_rm(tcpconn);
}
}
}
/* check unix sockets & listen | destroy connections */
/* start from 1, the "main" process does not transmit anything*/
for (r=1; r<process_no && n; r++){
if ( (pt[r].unix_sock>0) && FD_ISSET(pt[r].unix_sock, &sel_set)){
/* (we can't have a fd==0, 0 i s never closed )*/
n--;
/* errno==EINTR !!! TODO*/
read_again:
bytes=read(pt[r].unix_sock, response, sizeof(response));
if (bytes==0){
/* EOF -> bad, child has died */
LOG(L_CRIT, "BUG: tcp_main_loop: dead child %d\n", r);
/* don't listen on it any more */
FD_CLR(pt[r].unix_sock, &master_set);
/*exit(-1)*/;
}else if (bytes<0){
if (errno==EINTR) goto read_again;
else{
LOG(L_CRIT, "ERROR: tcp_main_loop: read from child: "
" %s\n", strerror(errno));
/* try to continue ? */
}
}
DBG("tcp_main_loop: read response= %lx, %ld from %d (%d)\n",
response[0], response[1], r, pt[r].pid);
cmd=response[1];
switch(cmd){
case CONN_RELEASE:
if (pt[r].idx>=0){
tcp_children[pt[r].idx].busy--;
}else{
LOG(L_CRIT, "BUG: tcp_main_loop: CONN_RELEASE\n");
}
tcpconn=(struct tcp_connection*)response[0];
if (tcpconn){
tcpconn->refcnt--;
DBG("tcp_main_loop: %p refcnt= %d\n",
tcpconn, tcpconn->refcnt);
FD_SET(tcpconn->s, &master_set);
if (maxfd<tcpconn->s) maxfd=tcpconn->s;
/* update the timeout*/
tcpconn->timeout=get_ticks()+TCP_CON_TIMEOUT;
}
break;
case CONN_ERROR:
case CONN_DESTROY:
case CONN_EOF:
if (pt[r].idx>=0){
tcp_children[pt[r].idx].busy--;
}else{
LOG(L_CRIT, "BUG: tcp_main_loop: CONN_RELEASE\n");
}
tcpconn=(struct tcp_connection*)response[0];
if (tcpconn){
tcpconn->refcnt--;
if (tcpconn->refcnt==0){
DBG("tcp_main_loop: destroying connection\n");
close(tcpconn->s);
tcpconn_rm(tcpconn);
}else{
DBG("tcp_main_loop: delaying ...\n");
}
}
break;
case CONN_GET_FD:
/* send the requested FD */
tcpconn=(struct tcp_connection*)response[0];
/* WARNING: take care of setting refcnt properly to
* avoid race condition */
if (tcpconn){
send_fd(pt[r].unix_sock, &tcpconn,
sizeof(tcpconn), tcpconn->s);
}else{
LOG(L_CRIT, "BUG: tcp_main_loop: null pointer\n");
}
break;
case CONN_NEW:
/* update the fd in the requested tcpconn*/
tcpconn=(struct tcp_connection*)response[0];
/* WARNING: take care of setting refcnt properly to
* avoid race condition */
if (tcpconn){
receive_fd(pt[r].unix_sock, &tcpconn,
sizeof(tcpconn), &tcpconn->s);
/* add tcpconn to the list*/
tcpconn_add(tcpconn);
FD_SET(tcpconn->s, &master_set);
if (maxfd<tcpconn->s) maxfd=tcpconn->s;
/* update the timeout*/
tcpconn->timeout=get_ticks()+TCP_CON_TIMEOUT;
}else{
LOG(L_CRIT, "BUG: tcp_main_loop: null pointer\n");
}
break;
default:
LOG(L_CRIT, "BUG: tcp_main_loop: unknown cmd %d\n",
cmd);
}
}
}
/* remove old connections */
tcpconn_timeout(&master_set);
}
}
int init_tcp()
{
/* allocate list head*/
conn_list=shm_malloc(sizeof(struct tcp_connection*));
if (conn_list==0){
LOG(L_CRIT, "ERROR: init_tcp: memory allocation failure\n");
goto error;
}
*conn_list=0;
return 0;
error:
return -1;
}
/* starts the tcp processes */
int tcp_init_children()
{
int r;
int sockfd[2];
pid_t pid;
/* 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++){
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sockfd)<0){
LOG(L_ERR, "ERROR: tcp_main: socketpair failed: %s\n",
strerror(errno));
goto error;
}
process_no++;
pid=fork();
if (pid<0){
LOG(L_ERR, "ERROR: tcp_main: fork failed: %s\n",
strerror(errno));
goto error;
}else if (pid>0){
/* parent */
close(sockfd[1]);
tcp_children[r].pid=pid;
tcp_children[r].busy=0;
tcp_children[r].n_reqs=0;
tcp_children[r].unix_sock=sockfd[0];
pt[process_no].pid=pid;
pt[process_no].unix_sock=sockfd[0];
pt[process_no].idx=r;
strncpy(pt[process_no].desc, "tcp receiver", MAX_PT_DESC);
}else{
/* child */
close(sockfd[0]);
unix_tcp_sock=sockfd[1];
tcp_receive_loop(sockfd[1]);
}
}
return 0;
error:
return -1;
}
#endif