/*
* $Id$
*
*
* 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:
* 2003-08-04 parse_content_type_hdr separates type from subtype inside
* the mime type (bogdan)
* 2003-08-04 CPL subtype added (bogdan)
* 2003-08-05 parse_accept_hdr function added (bogdan)
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include "../mem/mem.h"
#include "../dprint.h"
#include "../str.h"
#include "../ut.h"
#include "parse_content.h"
#define is_mime_char(_c_) \
(isalpha((int)_c_) || (_c_)=='-' || (_c_)=='+')
#define is_char_equal(_c_,_cs_) \
( (isalpha((int)_c_)?(((_c_)|0x20)==(_cs_)):((_c_)==(_cs_)))==1 )
/*
* Node of the type's tree; this tree contains all the known types;
*/
typedef struct type_node_s {
char c; /* char contained by this node */
unsigned char final; /* says what mime type/subtype was detected
* if string ends at this node */
unsigned char nr_sons; /* the number of sub-nodes */
int next; /* the next sibling node */
}type_node_t;
static type_node_t type_tree[] = {
{'t',TYPE_UNKNOWN,1,4},
{'e',TYPE_UNKNOWN,1,-1},
{'x',TYPE_UNKNOWN,1,-1},
{'t',TYPE_TEXT,0,-1},
{'m',TYPE_UNKNOWN,1,11},
{'e',TYPE_UNKNOWN,1,-1},
{'s',TYPE_UNKNOWN,1,-1},
{'s',TYPE_UNKNOWN,1,-1},
{'a',TYPE_UNKNOWN,1,-1},
{'g',TYPE_UNKNOWN,1,-1},
{'e',TYPE_MESSAGE,0,-1},
{'a',TYPE_UNKNOWN,1,-1},
{'p',TYPE_UNKNOWN,1,-1},
{'p',TYPE_UNKNOWN,1,-1},
{'l',TYPE_UNKNOWN,1,-1},
{'i',TYPE_UNKNOWN,1,-1},
{'c',TYPE_UNKNOWN,1,-1},
{'a',TYPE_UNKNOWN,1,-1},
{'t',TYPE_UNKNOWN,1,-1},
{'i',TYPE_UNKNOWN,1,-1},
{'o',TYPE_UNKNOWN,1,-1},
{'n',TYPE_APPLICATION,0,-1}
};
static type_node_t subtype_tree[] = {
{'p',SUBTYPE_UNKNOWN,1,5},
{'l',SUBTYPE_UNKNOWN,1,-1},
{'a',SUBTYPE_UNKNOWN,1,-1},
{'i',SUBTYPE_UNKNOWN,1,-1},
{'n',SUBTYPE_PLAIN,0,-1},
{'c',SUBTYPE_UNKNOWN,1,10},
{'p',SUBTYPE_UNKNOWN,2,-1},
{'i',SUBTYPE_UNKNOWN,1,9},
{'m',SUBTYPE_CPIM,0,-1},
{'l',SUBTYPE_UNKNOWN,1,-1},
{'+',TYPE_UNKNOWN,1,-1},
{'x',TYPE_UNKNOWN,1,-1},
{'m',TYPE_UNKNOWN,1,-1},
{'l',SUBTYPE_CPLXML,0,-1},
{'s',SUBTYPE_UNKNOWN,1,-1},
{'d',SUBTYPE_UNKNOWN,1,-1},
{'p',SUBTYPE_SDP,0,-1},
};
char* parse_content_length( char* buffer, char* end, int* length)
{
int number;
char *p;
int size;
p = buffer;
/* search the begining of the number */
while ( p<end && (*p==' ' || *p=='\t' ||
(*p=='\n' && (*(p+1)==' '||*(p+1)=='\t')) ))
p++;
if (p==end)
goto error;
/* parse the number */
size = 0;
number = 0;
while (p<end && *p>='0' && *p<='9') {
number = number*10 + (*p)-'0';
size ++;
p++;
}
if (p==end || size==0)
goto error;
/* now we should have only spaces at the end */
while ( p<end && (*p==' ' || *p=='\t' ||
(*p=='\n' && (*(p+1)==' '||*(p+1)=='\t')) ))
p++;
if (p==end)
goto error;
/* the header ends proper? */
if ( (*(p++)!='\n') && (*(p-1)!='\r' || *(p++)!='\n' ) )
goto error;
*length = number;
return p;
error:
LOG(L_ERR,"ERROR:parse_content_length: parse error near char [%d][%c]\n",
*p,*p);
return 0;
}
char* decode_mime_type(char *start, char *end, unsigned int *mime_type)
{
int node;
char *mark;
char *p;
p = start;
/* search the begining of the type */
while ( p<end && (*p==' ' || *p=='\t' ||
(*p=='\n' && (*(p+1)==' '||*(p+1)=='\t')) ))
p++;
if (p==end)
goto error;
/* parse the type */
if (*p=='*') {
*mime_type = TYPE_ALL<<16;
p++;
} else {
node = 0;
mark = p;
while (p<end && is_mime_char(*p) ) {
while ( node!=-1 && !is_char_equal(*p,type_tree[node].c) ){
node = type_tree[node].next;
}
if (node!=-1 && type_tree[node].nr_sons)
node++;
p++;
}
if (p==end || mark==p)
goto error;
if (node!=-1)
*mime_type = type_tree[node].final<<16;
else
*mime_type = TYPE_UNKNOWN<<16;
}
/* search the '/' separator */
while ( p<end && (*p==' ' || *p=='\t' ||
(*p=='\n' && (*(p+1)==' '||*(p+1)=='\t')) ))
p++;
if ( p==end || *(p++)!='/')
goto error;
/* search the begining of the sub-type */
while ( p<end && (*p==' ' || *p=='\t' ||
(*p=='\n' && (*(p+1)==' '||*(p+1)=='\t')) ))
p++;
if (p==end)
goto error;
/* parse the sub-type */
if (*p=='*') {
*mime_type |= SUBTYPE_ALL;
p++;
} else {
node = 0;
mark = p;
while (p<end && is_mime_char(*p) ) {
while(node!=-1 && !is_char_equal(*p,subtype_tree[node].c) )
node = subtype_tree[node].next;
if (node!=-1 && subtype_tree[node].nr_sons)
node++;
p++;
}
if (p==mark)
goto error;
if (node!=-1)
*mime_type |= subtype_tree[node].final;
else
*mime_type |= SUBTYPE_UNKNOWN;
}
/* now its possible to have some spaces */
while ( p<end && (*p==' ' || *p=='\t' ||
(*p=='\n' && (*(p+1)==' '||*(p+1)=='\t')) ))
p++;
/* if there are params, ignore them!! -> eat everything to
* the end or to the first ',' */
if ( p<end && *p==';' )
for(p++; p<end && *p!=','; p++);
/* is this the correct end? */
if (p!=end && *p!=',' )
goto error;
/* check the format of the decoded mime */
if ((*mime_type)>>16==TYPE_ALL && ((*mime_type)&0x00ff)!=SUBTYPE_ALL) {
LOG(L_ERR,"ERROR:decode_mine_type: invalid mime format found "
" <*/submime> in [%.*s]!!\n", (int)(end-start),start);
return 0;
}
return p;
error:
LOG(L_ERR,"ERROR:decode_mine_type: parse error near in [%.*s] char"
"[%d][%c] offset=%d\n", (int)(end-start),start,*p,*p,(int)(p-start));
return 0;
}
/* returns: > 0 mime found
* = 0 hdr not found
* =-1 error */
int parse_content_type_hdr( struct sip_msg *msg )
{
char *end;
char *ret;
unsigned int mime;
/* is the header already found? */
if ( msg->content_type==0 ) {
/* if not, found it */
if ( parse_headers(msg,HDR_CONTENTTYPE,0)==-1)
goto error;
if ( msg->content_type==0 ) {
DBG("DEBUG:parse_content_type_hdr: missing Content-Type"
"header\n");
return 0;
}
}
/* maybe the header is already parsed! */
if ( msg->content_type->parsed!=0)
return get_content_type(msg);
/* it seams we have to parse it! :-( */
end = msg->content_type->body.s + msg->content_type->body.len;
ret = decode_mime_type(msg->content_type->body.s, end , &mime);
if (ret==0)
goto error;
if (ret!=end) {
LOG(L_ERR,"ERROR:parse_content_type_hdr: CONTENT_TYPE hdr containes "
"more then one mime type :-(!\n");
goto error;
}
if ((mime&0x00ff)==SUBTYPE_ALL || (mime>>16)==TYPE_ALL) {
LOG(L_ERR,"ERROR:parse_content_type_hdr: invalid mime with wildcard "
"'*' in Content-Type hdr!\n");
goto error;
}
msg->content_type->parsed = (void*)(unsigned long)mime;
return mime;
error:
return -1;
}
/* returns: > 0 ok
* = 0 hdr not found
* = -1 error */
int parse_accept_hdr( struct sip_msg *msg )
{
static unsigned int mimes[MAX_MIMES_NR];
int nr_mimes;
unsigned int mime;
char *end;
char *ret;
/* is the header already found? */
if ( msg->accept==0 ) {
/* if not, found it */
if ( parse_headers(msg,HDR_ACCEPT,0)==-1)
goto error;
if ( msg->accept==0 ) {
DBG("DEBUG:parse_accept_hdr: missing Accept header\n");
return 0;
}
}
/* maybe the header is already parsed! */
if ( msg->accept->parsed!=0)
return 1;
/* it seams we have to parse it! :-( */
ret = msg->accept->body.s;
end = ret + msg->accept->body.len;
nr_mimes = 0;
while (1){
ret = decode_mime_type(ret, end , &mime);
if (ret==0)
goto error;
/* a new mime was found -> put it into array */
if (nr_mimes==MAX_MIMES_NR) {
LOG(L_ERR,"ERROR:parse_accept_hdr: Accept hdr contains more than"
" %d mime type -> buffer ovrflow!!\n",MAX_MIMES_NR);
goto error;
}
mimes[nr_mimes++] = mime;
/* is another mime following? */
if (ret==end )
break;
/* parse the mime separator ',' */
if (*ret!=',' || ret+1==end) {
LOG(L_ERR,"ERROR:parse_accept_hdr: parse error between mimes at "
"char <%x> (offset=%d) in <%.*s>!\n",
*ret, (int)(ret-msg->accept->body.s),
msg->accept->body.len, msg->accept->body.s);
goto error;
}
/* skip the ',' */
ret++;
}
/* copy and link the mime buffer into the message */
msg->accept->parsed = (void*)pkg_malloc((nr_mimes+1)*sizeof(int));
if (msg->accept->parsed==0) {
LOG(L_ERR,"ERROR:parse_accept_hdr: no more pkg memory\n");
goto error;
}
memcpy(msg->accept->parsed,mimes,nr_mimes*sizeof(int));
/* make the buffer null terminated */
((int*)msg->accept->parsed)[nr_mimes] = 0;
return 1;
error:
return -1;
}