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lrkproxy_funcs.c
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/*
* Copyright (C) 2001-2003 FhG Fokus
* Copyright (C) 2014-2015 Sipwise GmbH, http://www.sipwise.com
* Copyright (C) 2020 Mojtaba Esfandiari.S, Nasim-Telecom
*
* This file is part of Kamailio, a free SIP server.
*
* Kamailio 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
*
* Kamailio 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include "lrkproxy_funcs.h"
#include "../../core/dprint.h"
#include "../../core/config.h"
#include "../../core/ut.h"
#include "../../core/forward.h"
#include "../../core/resolve.h"
#include "../../core/globals.h"
#include "../../core/udp_server.h"
#include "../../core/pt.h"
#include "../../core/parser/msg_parser.h"
#include "../../core/trim.h"
#include "../../core/parser/parse_from.h"
#include "../../core/parser/contact/parse_contact.h"
#include "../../core/parser/parse_uri.h"
#include "../../core/parser/parse_content.h"
#include "../../core/parser/parser_f.h"
#include "../../core/parser/sdp/sdp_helpr_funcs.h"
static pv_spec_t *custom_sdp_ip_avp; /*!< AVP for custom_sdp_ip setting */
#define READ(val) \
(*(val + 0) + (*(val + 1) << 8) + (*(val + 2) << 16) + (*(val + 3) << 24))
#define advance(_ptr, _n, _str, _error) \
do { \
if((_ptr) + (_n) > (_str).s + (_str).len) \
goto _error; \
(_ptr) = (_ptr) + (_n); \
} while(0);
#define one_of_16(_x, _t) \
(_x == _t[0] || _x == _t[15] || _x == _t[8] || _x == _t[2] || _x == _t[3] \
|| _x == _t[4] || _x == _t[5] || _x == _t[6] || _x == _t[7] \
|| _x == _t[1] || _x == _t[9] || _x == _t[10] || _x == _t[11] \
|| _x == _t[12] || _x == _t[13] || _x == _t[14])
#define one_of_8(_x, _t) \
(_x == _t[0] || _x == _t[7] || _x == _t[1] || _x == _t[2] || _x == _t[3] \
|| _x == _t[4] || _x == _t[5] || _x == _t[6])
/**
* return:
* -1: error
* 1: text or sdp
* 2: multipart
* 3: trickle ice sdp fragment
*/
int check_content_type(struct sip_msg *msg)
{
static unsigned int appl[16] = {0x6c707061 /*appl*/, 0x6c707041 /*Appl*/,
0x6c705061 /*aPpl*/, 0x6c705041 /*APpl*/, 0x6c507061 /*apPl*/,
0x6c507041 /*ApPl*/, 0x6c505061 /*aPPl*/, 0x6c505041 /*APPl*/,
0x4c707061 /*appL*/, 0x4c707041 /*AppL*/, 0x4c705061 /*aPpL*/,
0x4c705041 /*APpL*/, 0x4c507061 /*apPL*/, 0x4c507041 /*ApPL*/,
0x4c505061 /*aPPL*/, 0x4c505041 /*APPL*/};
static unsigned int icat[16] = {0x74616369 /*icat*/, 0x74616349 /*Icat*/,
0x74614369 /*iCat*/, 0x74614349 /*ICat*/, 0x74416369 /*icAt*/,
0x74416349 /*IcAt*/, 0x74414369 /*iCAt*/, 0x74414349 /*ICAt*/,
0x54616369 /*icaT*/, 0x54616349 /*IcaT*/, 0x54614369 /*iCaT*/,
0x54614349 /*ICaT*/, 0x54416369 /*icAT*/, 0x54416349 /*IcAT*/,
0x54414369 /*iCAT*/, 0x54414349 /*ICAT*/};
static unsigned int ion_[8] = {0x006e6f69 /*ion_*/, 0x006e6f49 /*Ion_*/,
0x006e4f69 /*iOn_*/, 0x006e4f49 /*IOn_*/, 0x004e6f69 /*ioN_*/,
0x004e6f49 /*IoN_*/, 0x004e4f69 /*iON_*/, 0x004e4f49 /*ION_*/};
static unsigned int sdp_[8] = {0x00706473 /*sdp_*/, 0x00706453 /*Sdp_*/,
0x00704473 /*sDp_*/, 0x00704453 /*SDp_*/, 0x00506473 /*sdP_*/,
0x00506453 /*SdP_*/, 0x00504473 /*sDP_*/, 0x00504453 /*SDP_*/};
str str_type;
unsigned int x;
char *p;
if(!msg->content_type) {
LM_WARN("the header Content-TYPE is absent!"
"let's assume the content is text/plain ;-)\n");
return 1;
}
trim_len(str_type.len, str_type.s, msg->content_type->body);
if(str_type.len >= 15 && (*str_type.s == 'm' || *str_type.s == 'M')
&& strncasecmp(str_type.s, "multipart/mixed", 15) == 0) {
return 2;
}
p = str_type.s;
advance(p, 4, str_type, error_1);
x = READ(p - 4);
if(!one_of_16(x, appl))
goto other;
advance(p, 4, str_type, error_1);
x = READ(p - 4);
if(!one_of_16(x, icat))
goto other;
advance(p, 3, str_type, error_1);
x = READ(p - 3) & 0x00ffffff;
if(!one_of_8(x, ion_))
goto other;
/* skip spaces and tabs if any */
while(*p == ' ' || *p == '\t')
advance(p, 1, str_type, error_1);
if(*p != '/') {
LM_ERR("no / found after primary type\n");
goto error;
}
advance(p, 1, str_type, error_1);
while((*p == ' ' || *p == '\t') && p + 1 < str_type.s + str_type.len)
advance(p, 1, str_type, error_1);
advance(p, 3, str_type, error_1);
x = READ(p - 3) & 0x00ffffff;
if(!one_of_8(x, sdp_)) {
if(strncasecmp(p - 3, "trickle-ice-sdpfrag", 19) == 0)
return 3;
goto other;
}
if(*p == ';' || *p == ' ' || *p == '\t' || *p == '\n' || *p == '\r'
|| *p == 0) {
LM_DBG("type <%.*s> found valid\n", (int)(p - str_type.s), str_type.s);
return 1;
} else {
LM_ERR("bad end for type!\n");
return -1;
}
error_1:
LM_ERR("body ended :-(!\n");
error:
return -1;
other:
LM_ERR("invalid type for a message\n");
return -1;
}
/*
* Get message body and check Content-Type header field
*/
int extract_body(struct sip_msg *msg, str *body)
{
char c;
int ret;
str mpdel;
char *rest, *p1, *p2;
struct hdr_field hf;
unsigned int mime;
body->s = get_body(msg);
if(body->s == 0) {
LM_ERR("failed to get the message body\n");
goto error;
}
/*
* Better use the content-len value - no need of any explicit
* parsing as get_body() parsed all headers and Content-Length
* body header is automatically parsed when found.
*/
if(msg->content_length == 0) {
LM_ERR("failed to get the content length in message\n");
goto error;
}
body->len = get_content_length(msg);
if(body->len == 0) {
LM_ERR("message body has length zero\n");
goto error;
}
if(body->len + body->s > msg->buf + msg->len) {
LM_ERR("content-length exceeds packet-length by %d\n",
(int)((body->len + body->s) - (msg->buf + msg->len)));
goto error;
}
/* no need for parse_headers(msg, EOH), get_body will
* parse everything */
/*is the content type correct?*/
if((ret = check_content_type(msg)) == -1) {
LM_ERR("content type mismatching\n");
goto error;
}
if(ret != 2)
goto done;
/* multipart body */
if(get_mixed_part_delimiter(&msg->content_type->body, &mpdel) < 0) {
goto error;
}
p1 = find_sdp_line_delimiter(body->s, body->s + body->len, mpdel);
if(p1 == NULL) {
LM_ERR("empty multipart content\n");
return -1;
}
p2 = p1;
c = 0;
for(;;) {
p1 = p2;
if(p1 == NULL || p1 >= body->s + body->len)
break; /* No parts left */
p2 = find_next_sdp_line_delimiter(
p1, body->s + body->len, mpdel, body->s + body->len);
/* p2 is text limit for application parsing */
rest = eat_line(p1 + mpdel.len + 2, p2 - p1 - mpdel.len - 2);
if(rest > p2) {
LM_ERR("Unparsable <%.*s>\n", (int)(p1 - p1), p1);
return -1;
}
while(rest < p2) {
memset(&hf, 0, sizeof(struct hdr_field));
rest = get_sdp_hdr_field(rest, p2, &hf);
if(hf.type == HDR_EOH_T)
break;
if(hf.type == HDR_ERROR_T)
return -1;
if(hf.type == HDR_CONTENTTYPE_T) {
if(decode_mime_type(hf.body.s, hf.body.s + hf.body.len, &mime)
== NULL)
return -1;
if(((((unsigned int)mime) >> 16) == TYPE_APPLICATION)
&& ((mime & 0x00ff) == SUBTYPE_SDP)) {
c = 1;
}
}
} /* end of while */
if(c == 1) {
if(rest < p2 && *rest == '\r')
rest++;
if(rest < p2 && *rest == '\n')
rest++;
if(rest < p2 && p2[-1] == '\n')
p2--;
if(rest < p2 && p2[-1] == '\r')
p2--;
body->s = rest;
body->len = p2 - rest;
goto done;
}
}
error:
return -1;
done:
/*LM_DBG("DEBUG:extract_body:=|%.*s|\n",body->len,body->s);*/
return ret; /* mirrors return type of check_content_type */
}
/*
* Some helper functions taken verbatim from tm module.
*/
/*
* Extract Call-ID value
* assumes the callid header is already parsed
* (so make sure it is, before calling this function or
* it might fail even if the message _has_ a callid)
*/
int get_callid(struct sip_msg *_m, str *_cid)
{
if((parse_headers(_m, HDR_CALLID_F, 0) == -1)) {
LM_ERR("failed to parse call-id header\n");
return -1;
}
if(_m->callid == NULL) {
LM_ERR("call-id not found\n");
return -1;
}
_cid->s = _m->callid->body.s;
_cid->len = _m->callid->body.len;
trim(_cid);
return 0;
}
/*
* Extract tag from To header field of a response
*/
int get_to_tag(struct sip_msg *_m, str *_tag)
{
if(parse_to_header(_m) < 0) {
LM_ERR("To header field missing\n");
return -1;
}
if(get_to(_m)->tag_value.len) {
_tag->s = get_to(_m)->tag_value.s;
_tag->len = get_to(_m)->tag_value.len;
} else {
_tag->s = NULL; /* fixes gcc 4.0 warnings */
_tag->len = 0;
}
return 0;
}
/*
* Extract tag from From header field of a request
*/
int get_from_tag(struct sip_msg *_m, str *_tag)
{
if(parse_from_header(_m) < 0) {
LM_ERR("failed to parse From header\n");
return -1;
}
if(get_from(_m)->tag_value.len) {
_tag->s = get_from(_m)->tag_value.s;
_tag->len = get_from(_m)->tag_value.len;
} else {
_tag->s = NULL; /* fixes gcc 4.0 warnings */
_tag->len = 0;
}
return 0;
}
/*
* Extract URI from the Contact header field
*/
int get_contact_uri(struct sip_msg *_m, struct sip_uri *uri, contact_t **_c)
{
if((parse_headers(_m, HDR_CONTACT_F, 0) == -1) || !_m->contact)
return -1;
if(!_m->contact->parsed && parse_contact(_m->contact) < 0) {
LM_ERR("failed to parse Contact body\n");
return -1;
}
*_c = ((contact_body_t *)_m->contact->parsed)->contacts;
if(*_c == NULL)
/* no contacts found */
return -1;
if(parse_uri((*_c)->uri.s, (*_c)->uri.len, uri) < 0 || uri->host.len <= 0) {
LM_ERR("failed to parse Contact URI [%.*s]\n", (*_c)->uri.len,
((*_c)->uri.s) ? (*_c)->uri.s : "");
return -1;
}
return 0;
}
/*
* Extract branch from Via header
*/
int get_via_branch(struct sip_msg *msg, int vianum, str *_branch)
{
struct via_body *via;
struct via_param *p;
if(parse_via_header(msg, vianum, &via) < 0)
return -1;
for(p = via->param_lst; p; p = p->next) {
if(p->name.len == strlen("branch")
&& strncasecmp(p->name.s, "branch", strlen("branch")) == 0) {
_branch->s = p->value.s;
_branch->len = p->value.len;
return 0;
}
}
return -1;
}
int get_sdp_ipaddr_media(struct sip_msg *msg, str *ip_addr)
{
sdp_session_cell_t *sdp_session;
sdp_stream_cell_t *sdp_stream;
sdp_info_t *sdp = (sdp_info_t *)msg->body;
if(!sdp) {
LM_INFO("sdp null\n");
return -1;
}
char *s = ip_addr2a(&msg->rcv.src_ip);
LM_INFO("=========>msg->rcv.src_ip:%s\n", s);
// LM_INFO("=========>msg->contact-body:%.*s\n", msg->contact->body.len, msg->contact->body.s);
// LM_INFO("=========>msg->contact-name:%.*s\n", msg->contact->name.len, msg->contact->name.s);
pv_value_t pv_val;
if(custom_sdp_ip_avp) {
if((pv_get_spec_value(msg, custom_sdp_ip_avp, &pv_val) == 0)
&& (pv_val.flags & PV_VAL_STR) && (pv_val.rs.len > 0)) {
ip_addr->s = pv_val.rs.s;
ip_addr->len = pv_val.rs.len;
LM_INFO("=========>custom_sdp_ip_avp:%.*s\n", ip_addr->len,
ip_addr->s);
return 0;
} else
LM_DBG("invalid AVP value, using default user from RURI\n");
}
int sdp_session_num = 0;
sdp_session = get_sdp_session(msg, sdp_session_num);
if(!sdp_session) {
LM_INFO("can not get the sdp session\n");
return 0;
}
if(sdp_session->ip_addr.s && sdp_session->ip_addr.len > 0) {
LM_INFO("sdp_session->ip_addr:%.*s\n", sdp_session->ip_addr.len,
sdp_session->ip_addr.s);
ip_addr->s = sdp_session->ip_addr.s;
ip_addr->len = sdp_session->ip_addr.len;
trim(ip_addr);
} else {
int sdp_stream_num = 0;
sdp_stream = get_sdp_stream(msg, sdp_session_num, sdp_stream_num);
if(!sdp_stream) {
LM_INFO("can not get the sdp stream\n");
return 0;
}
if(sdp_stream->ip_addr.s && sdp_stream->ip_addr.len > 0) {
LM_INFO("sdp_stream->ip_addr:%.*s\n", sdp_stream->ip_addr.len,
sdp_stream->ip_addr.s);
ip_addr->s = sdp_stream->ip_addr.s;
ip_addr->len = sdp_stream->ip_addr.len;
trim(ip_addr);
}
}
return 0;
}
int get_sdp_port_media(struct sip_msg *msg, str *port)
{
// sdp_session_cell_t *sdp_session;
sdp_stream_cell_t *sdp_stream;
int sdp_session_num = 0;
sdp_info_t *sdp = (sdp_info_t *)msg->body;
if(!sdp) {
LM_INFO("sdp null\n");
return -1;
}
// sdp_session = get_sdp_session(msg, sdp_session_num);
// if(!sdp_session) {
// LM_INFO("can not get the sdp session\n");
// return 0;
// } else {
// LM_INFO("NEW_IP_ADDRESS:>%.*s>\n", sdp_session->ip_addr.len, sdp_session->ip_addr.s);
// lrk_sdp_info->ip_addr.s = sdp_session->ip_addr;
int sdp_stream_num = 0;
sdp_stream = get_sdp_stream(msg, sdp_session_num, sdp_stream_num);
if(!sdp_stream) {
LM_INFO("can not get the sdp stream\n");
return -1;
} else {
// LM_INFO ("PORT:<%.*s>\n", sdp_stream->port.len, sdp_stream->port.s);
// str2int(&sdp_stream->port, lrk_sdp_info->port)
port->s = sdp_stream->port.s;
port->len = sdp_stream->port.len;
trim(port);
}
// }
return 0;
}
void init_custom_sdp_ip(pv_spec_t *custom_sdp_ip_avp_p)
{
custom_sdp_ip_avp = custom_sdp_ip_avp_p;
}