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sniff.cpp
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sniff.cpp
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/* Martin Vit [email protected]
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2.
*/
/*
This unit reads and parse packets from network interface or file
and insert them into Call class.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <time.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <net/ethernet.h>
#include <iomanip>
#include "voipmonitor.h"
#ifdef FREEBSD
#include <machine/endian.h>
#else
#include <malloc.h>
#include <endian.h>
#endif
#include <sys/times.h>
#include <sys/param.h>
#include <sys/signal.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <syslog.h>
#include <semaphore.h>
#include <sstream>
#include <pcap.h>
//#include <pcap/sll.h>
#define int_ntoa(x) inet_ntoa(*((struct in_addr *)&x))
//#define HAS_NIDS 1
#ifdef HAS_NIDS
#include <nids.h>
#endif
#include "flags.h"
#include "codecs.h"
#include "calltable.h"
#include "sniff.h"
#include "voipmonitor.h"
#include "filter_mysql.h"
#include "hash.h"
#include "rtp.h"
#include "rtcp.h"
#include "md5.h"
#include "tools.h"
#include "mirrorip.h"
#include "ipaccount.h"
#include "sql_db.h"
#include "rtp.h"
#include "skinny.h"
#include "tcpreassembly.h"
#include "ip_frag.h"
#include "regcache.h"
#include "manager.h"
#include "fraud.h"
#include "send_call_info.h"
extern MirrorIP *mirrorip;
#define MAXLIVEFILTERS 10
using namespace std;
#ifndef MAX
#define MAX(x,y) ((x) > (y) ? (x) : (y))
#endif
#ifndef MIN
#define MIN(x,y) ((x) < (y) ? (x) : (y))
#endif
#ifdef MUTEX_THREAD
queue<pcap_packet*> readpacket_thread_queue;
extern pthread_mutex_t readpacket_thread_queue_lock;
#endif
unsigned int duplicate_counter = 0;
extern struct pcap_stat pcapstat;
int pcapstatresCount = 0;
volatile unsigned int glob_last_packet_time;
Calltable *calltable;
extern volatile int calls_counter;
extern int opt_saveSIP; // save SIP packets to pcap file?
extern int opt_saveRTP; // save RTP packets to pcap file?
extern int opt_saveRTCP; // save RTCP packets to pcap file?
extern int opt_saveRAW;
extern int opt_saveWAV;
extern int opt_saveGRAPH;
extern int opt_packetbuffered; // Make .pcap files writing ‘‘packet-buffered’’
extern int opt_rtcp; // Make .pcap files writing ‘‘packet-buffered’’
extern int verbosity;
extern int verbosityE;
extern int opt_rtp_firstleg;
extern int opt_sip_register;
extern int opt_norecord_header;
extern int opt_enable_http;
extern int opt_enable_webrtc;
extern int opt_enable_ssl;
extern int opt_convert_dlt_sll_to_en10;
extern char *sipportmatrix;
extern char *httpportmatrix;
extern char *webrtcportmatrix;
extern pcap_t *global_pcap_handle;
extern pcap_t *global_pcap_handle_dead_EN10MB;
extern rtp_read_thread *rtp_threads;
extern int opt_norecord_dtmf;
extern int opt_onlyRTPheader;
extern int opt_sipoverlap;
extern int readend;
extern int opt_dup_check;
extern int opt_dup_check_ipheader;
extern char opt_match_header[128];
extern char opt_callidmerge_header[128];
extern char opt_callidmerge_secret[128];
extern int opt_domainport;
extern int opt_mirrorip;
extern int opt_mirrorall;
extern int opt_mirroronly;
extern char opt_scanpcapdir[2048];
extern int opt_ipaccount;
extern int opt_cdrproxy;
extern IPfilter *ipfilter;
extern IPfilter *ipfilter_reload;
extern volatile int ipfilter_reload_do;
extern TELNUMfilter *telnumfilter;
extern TELNUMfilter *telnumfilter_reload;
extern volatile int telnumfilter_reload_do;
extern DOMAINfilter *domainfilter;
extern DOMAINfilter *domainfilter_reload;
extern volatile int domainfilter_reload_do;
extern SIP_HEADERfilter *sipheaderfilter;
extern SIP_HEADERfilter *sipheaderfilter_reload;
extern volatile int sipheaderfilter_reload_do;
extern int rtp_threaded;
extern int opt_rtpsave_threaded;
extern int opt_rtpnosip;
extern char opt_cachedir[1024];
extern int opt_savewav_force;
extern int opt_saveudptl;
extern nat_aliases_t nat_aliases;
extern int opt_enable_preprocess_packet;
extern unsigned int opt_preprocess_packets_qring_length;
extern unsigned int opt_preprocess_packets_qring_usleep;
extern unsigned int opt_process_rtp_packets_qring_length;
extern unsigned int opt_process_rtp_packets_qring_usleep;
extern unsigned int rtp_qring_usleep;
extern int opt_pcapdump;
extern int opt_id_sensor;
extern int opt_destination_number_mode;
extern int opt_update_dstnum_onanswer;
extern MySqlStore *sqlStore;
int global_pcap_dlink;
extern int opt_udpfrag;
extern int global_livesniffer;
extern int opt_pcap_split;
extern int opt_newdir;
extern int opt_callslimit;
extern int opt_skiprtpdata;
extern char opt_silencedmtfseq[16];
extern int opt_skinny;
extern int opt_read_from_file;
extern int opt_saverfc2833;
extern livesnifferfilter_use_siptypes_s livesnifferfilterUseSipTypes;
extern int opt_skipdefault;
extern TcpReassembly *tcpReassemblyHttp;
extern TcpReassembly *tcpReassemblyWebrtc;
extern TcpReassembly *tcpReassemblySsl;
extern char ifname[1024];
extern int opt_sdp_reverse_ipport;
extern int opt_fork;
extern regcache *regfailedcache;
extern ManagerClientThreads ClientThreads;
extern int opt_register_timeout;
extern int opt_nocdr;
extern int opt_enable_fraud;
extern int pcap_drop_flag;
extern int opt_hide_message_content;
extern int opt_remotepartyid;
extern int opt_remotepartypriority;
extern int opt_ppreferredidentity;
extern int opt_passertedidentity;
extern char cloud_host[256];
extern SocketSimpleBufferWrite *sipSendSocket;
extern int opt_sip_send_before_packetbuffer;
extern PreProcessPacket *preProcessPacket;
extern ProcessRtpPacket *processRtpPacket[MAX_PROCESS_RTP_PACKET_THREADS];
extern int opt_enable_process_rtp_packet;
extern CustomHeaders *custom_headers_cdr;
extern CustomHeaders *custom_headers_message;
extern bool _save_sip_history;
extern bool _save_sip_history_request_types[1000];
extern bool _save_sip_history_all_requests;
extern bool _save_sip_history_all_responses;extern int absolute_timeout;
unsigned int glob_ssl_calls = 0;
char * gettag(const void *ptr, unsigned long len, const char *tag, unsigned long *gettaglen, unsigned long *limitLen = NULL,
ParsePacket *parsePacket = NULL);
static void logPacketSipMethodCall(u_int64_t packet_number, int sip_method, int lastSIPresponseNum, pcap_pkthdr *header,
unsigned int saddr, int source, unsigned int daddr, int dest,
Call *call, const char *descr = NULL);
#define logPacketSipMethodCall_enable ((opt_read_from_file && verbosity > 2) || verbosityE > 1 || sverb.sip_packets)
typedef struct pcap_hdr_s {
u_int32_t magic_number; /* magic number */
u_int16_t version_major; /* major version number */
u_int16_t version_minor; /* minor version number */
int32_t thiszone; /* GMT to local correction */
u_int32_t sigfigs; /* accuracy of timestamps */
u_int32_t snaplen; /* max length of captured packets, in octets */
u_int32_t network; /* data link type */
} pcap_hdr_t;
typedef struct pcaprec_hdr_s {
u_int32_t ts_sec; /* timestamp seconds */
u_int32_t ts_usec; /* timestamp microseconds */
u_int32_t incl_len; /* number of octets of packet saved in file */
u_int32_t orig_len; /* actual length of packet */
} pcaprec_hdr_t;
TcpReassemblySip tcpReassemblySip;
ipfrag_data_s ipfrag_data;
u_int64_t counter_calls;
u_int64_t counter_sip_packets[2];
u_int64_t counter_sip_register_packets;
u_int64_t counter_sip_message_packets;
u_int64_t counter_rtp_packets;
u_int64_t counter_all_packets;
u_int64_t process_rtp_counter;
u_int64_t read_rtp_counter;
extern struct queue_state *qs_readpacket_thread_queue;
map<unsigned int, livesnifferfilter_t*> usersniffer;
volatile int usersniffer_sync;
#define ENABLE_CONVERT_DLT_SLL_TO_EN10(dlt) (dlt == DLT_LINUX_SLL && opt_convert_dlt_sll_to_en10 && global_pcap_handle_dead_EN10MB)
#include "sniff_inline.h"
static unsigned long process_packet__last_cleanup = 0;
static unsigned long process_packet__last_filter_reload = 0;
static unsigned long process_packet__last_destroy_calls = 0;
static unsigned long preprocess_packet__last_cleanup = 0;
// return IP from nat_aliases[ip] or 0 if not found
in_addr_t match_nat_aliases(in_addr_t ip) {
nat_aliases_t::iterator iter;
iter = nat_aliases.find(ip);
if(iter == nat_aliases.end()) {
// not found
return 0;
} else {
return iter->second;
}
}
inline void save_packet_sql(Call *call, struct pcap_pkthdr *header, const u_char *packet, unsigned int saddr, int source, unsigned int daddr, int dest, int istcp, char *data, int datalen, int uid, int dlt, int sensor_id) {
//save packet
stringstream query;
// pcap file header
pcap_hdr_t pcaphdr; // 24bytes
pcaphdr.magic_number = 0xa1b2c3d4;
pcaphdr.version_major = 2;
pcaphdr.version_minor = 4;
pcaphdr.thiszone = 0;
pcaphdr.sigfigs = 0;
pcaphdr.snaplen = 3200;
pcaphdr.network = ENABLE_CONVERT_DLT_SLL_TO_EN10(dlt) ? DLT_EN10MB : dlt;
// packet header
pcaprec_hdr_t pcaph;
pcaph.ts_sec = header->ts.tv_sec; /* timestamp seconds */
pcaph.ts_usec = header->ts.tv_usec; /* timestamp microseconds */
pcaph.incl_len = header->caplen; /* number of octets of packet saved in file */
pcaph.orig_len = header->caplen; /* actual length of packet */
// copy data to mpacket buffer
char mpacket[10512];
char *ptr = mpacket;
memcpy(ptr, &pcaphdr, sizeof(pcaphdr)); // pcap header
ptr += sizeof(pcaphdr);
memcpy(ptr, &pcaph, sizeof(pcaph)); // packet header
ptr += sizeof(pcaph);
unsigned int len = MIN(10000, header->caplen);
memcpy(ptr, packet, len);
len += sizeof(pcaph) + sizeof(pcaphdr);
//construct description and call-id
char description[1024] = "";
char callidstr[1024] = "";
if(datalen) {
void *memptr = memmem(data, datalen, "\r\n", 2);
if(memptr) {
memcpy(description, data, (char *)memptr - (char*)data);
description[(char*)memptr - (char*)data] = '\0';
} else {
strcpy(description, "error in description\n");
}
if(!call) {
unsigned long l;
char *s = gettag(data, datalen, "\nCall-ID:", &l);
if(l > 0 && l < 1024) {
memcpy(callidstr, s, MIN(l, 1024));
callidstr[MIN(l, 1023)] = '\0';
}
}
}
// construct query and push it to mysqlquery queue
int id_sensor = sensor_id > 0 ? sensor_id : 0;
query << "INSERT INTO livepacket_" << uid <<
" SET sipcallerip = '" << saddr <<
"', sipcalledip = '" << daddr <<
"', id_sensor = " << id_sensor <<
", sport = " << source <<
", dport = " << dest <<
", istcp = " << istcp <<
", created_at = " << sqlEscapeStringBorder(sqlDateTimeString(header->ts.tv_sec).c_str()) <<
", microseconds = " << header->ts.tv_usec <<
", callid = " << sqlEscapeStringBorder(call ? call->call_id : callidstr) <<
", description = " << sqlEscapeStringBorder(description) <<
", data = ";
if(cloud_host[0]) {
query << "concat('#', from_base64('" << base64_encode((unsigned char*)mpacket, len) << "'), '#')";
} else {
query << "'#" << _sqlEscapeString(mpacket, len, "mysql") << "#'";
}
sqlStore->query_lock(query.str().c_str(), STORE_PROC_ID_SAVE_PACKET_SQL);
return;
}
/*
stores SIP messags to sql.livepacket based on user filters
*/
int get_sip_peername(char *data, int data_len, const char *tag, char *peername, unsigned int peername_len);
inline void save_live_packet(Call *call, struct pcap_pkthdr *header, const u_char *packet, unsigned int saddr, int source, unsigned int daddr, int dest, int istcp, char *data, int datalen, unsigned char sip_type,
int dlt, int sensor_id) {
if(!global_livesniffer) {
return;
}
// check saddr and daddr filters
daddr = htonl(daddr);
saddr = htonl(saddr);
while(__sync_lock_test_and_set(&usersniffer_sync, 1));
map<unsigned int, livesnifferfilter_t*>::iterator usersnifferIT;
char caller[1024] = "", called[1024] = "";
if(call) {
strncpy(caller, call->caller, sizeof(caller));
caller[sizeof(caller) - 1] = 0;
strncpy(called, call->called, sizeof(called));
called[sizeof(called) - 1] = 0;
} else {
bool needcaller = false;
bool needcalled = false;
for(usersnifferIT = usersniffer.begin(); usersnifferIT != usersniffer.end(); usersnifferIT++) {
if(!usersnifferIT->second->state.all_all && !usersnifferIT->second->state.all_num) {
for(int i = 0; i < MAXLIVEFILTERS; i++) {
if(!usersnifferIT->second->state.all_srcnum && usersnifferIT->second->lv_srcnum[i][0]) {
needcaller = true;
}
if(!usersnifferIT->second->state.all_dstnum && usersnifferIT->second->lv_dstnum[i][0]) {
needcalled = true;
}
if(!usersnifferIT->second->state.all_bothnum && usersnifferIT->second->lv_bothnum[i][0]) {
needcaller = true;
needcalled = true;
}
}
}
}
int res;
if(needcaller) {
res = get_sip_peername(data,datalen,"\nFrom:", caller, sizeof(caller));
if(res) {
// try compact header
get_sip_peername(data,datalen,"\nf:", caller, sizeof(caller));
}
}
if(needcalled) {
res = get_sip_peername(data,datalen,"\nTo:", called, sizeof(called));
if(res) {
// try compact header
get_sip_peername(data,datalen,"\nt:", called, sizeof(called));
}
}
}
for(usersnifferIT = usersniffer.begin(); usersnifferIT != usersniffer.end(); usersnifferIT++) {
livesnifferfilter_t *filter = usersnifferIT->second;
bool save = filter->state.all_all;
if(!save) {
bool okAddr = filter->state.all_addr;
if(!okAddr) {
for(int i = 0; i < MAXLIVEFILTERS && !okAddr; i++) {
if((filter->state.all_saddr || (filter->lv_saddr[i] &&
saddr == filter->lv_saddr[i])) &&
(filter->state.all_daddr || (filter->lv_daddr[i] &&
daddr == filter->lv_daddr[i])) &&
(filter->state.all_bothaddr || (filter->lv_bothaddr[i] &&
(saddr == filter->lv_bothaddr[i] ||
daddr == filter->lv_bothaddr[i])))) {
okAddr = true;
}
}
}
bool okNum = filter->state.all_num;
if(!okNum) {
for(int i = 0; i < MAXLIVEFILTERS && !okNum; i++) {
if((filter->state.all_srcnum || (filter->lv_srcnum[i][0] &&
memmem(caller, strlen(caller), filter->lv_srcnum[i], strlen(filter->lv_srcnum[i])))) &&
(filter->state.all_dstnum || (filter->lv_dstnum[i][0] &&
memmem(called, strlen(called), filter->lv_dstnum[i], strlen(filter->lv_dstnum[i])))) &&
(filter->state.all_bothnum || (filter->lv_bothnum[i][0] &&
(memmem(caller, strlen(caller), filter->lv_bothnum[i], strlen(filter->lv_bothnum[i])) ||
memmem(called, strlen(called), filter->lv_bothnum[i], strlen(filter->lv_bothnum[i])))))) {
okNum = true;
}
}
}
bool okSipType = filter->state.all_siptypes;
if(!okSipType) {
for(int i = 0; i < MAXLIVEFILTERS && !okSipType; i++) {
if(filter->lv_siptypes[i] == sip_type) {
okSipType = true;
}
}
}
if(okAddr && okNum && okSipType) {
save = true;
}
}
if(save) {
save_packet_sql(call, header, packet, saddr, source, daddr, dest, istcp, data, datalen, usersnifferIT->first,
dlt, sensor_id);
}
}
__sync_lock_release(&usersniffer_sync);
}
/*
save packet into file
type - 1 is SIP, 2 is RTP, 3 is RTCP
*/
void save_packet(Call *call, struct pcap_pkthdr *header, const u_char *packet,
unsigned int saddr, int source, unsigned int daddr, int dest,
int istcp, iphdr2 *header_ip, char *data, unsigned int datalen, unsigned int dataoffset, int type,
int forceSip, int dlt, int sensor_id) {
bool allocPacket = false;
bool allocHeader = false;
if(ENABLE_CONVERT_DLT_SLL_TO_EN10(dlt)) {
const u_char *packet_orig = packet;
pcap_pkthdr *header_orig = header;
packet = (const u_char*) new FILE_LINE u_char[header_orig->caplen];
memcpy((u_char*)packet, (u_char*)packet_orig, 14);
memset((u_char*)packet, 0, 6);
((ether_header*)packet)->ether_type = ((sll_header*)packet_orig)->sll_protocol;
memcpy((u_char*)packet + 14, (u_char*)packet_orig + 16, header_orig->caplen - 16);
header = new FILE_LINE pcap_pkthdr;
memcpy(header, header_orig, sizeof(pcap_pkthdr));
header->caplen -= 2;
header->len -= 2;
allocPacket = true;
allocHeader = true;
}
unsigned int limitCapLen = 65535;
if(dataoffset > 0 && dataoffset < 100 &&
((call->type == MESSAGE && opt_hide_message_content) ||
(istcp && header->caplen > limitCapLen))) {
unsigned long l;
char *s = gettag(data, datalen, "\nContent-Length:", &l);
if(l && l < datalen) {
long int contentLength = atol(s);
if(contentLength > 0) {
if(istcp &&
header->caplen > limitCapLen &&
(u_char*)header_ip > packet &&
(u_char*)header_ip - packet < 100) {
u_int32_t diffLen = header->caplen - limitCapLen;
header->caplen -= diffLen;
header->len -= diffLen;
header_ip->tot_len = htons(ntohs(header_ip->tot_len) - diffLen);
contentLength -= diffLen;
while(*s == ' ') {
++s;
}
char contLengthStr[10];
sprintf(contLengthStr, "%u", (unsigned int)contentLength);
char *pointToModifyContLength = (char*)packet + dataoffset + (s - data);
strncpy(pointToModifyContLength, contLengthStr, strlen(contLengthStr));
char *pointToEndModifyContLength = pointToModifyContLength + strlen(contLengthStr);
while(*pointToEndModifyContLength != '\r') {
*pointToEndModifyContLength = ' ';
++pointToEndModifyContLength;
}
}
if(call->type == MESSAGE && opt_hide_message_content) {
char *endHeaderSepPos = (char*)memmem(data, datalen, "\r\n\r\n", 4);
if(endHeaderSepPos) {
const u_char *packet_orig = packet;
packet = (const u_char*) new FILE_LINE u_char[header->caplen];
memcpy((u_char*)packet, packet_orig, header->caplen);
u_char *message = (u_char*)packet + dataoffset + (endHeaderSepPos - data) + 4;
memset((u_char*)message, 'x', min(contentLength, (long int)(header->caplen - (message - packet))));
allocPacket = true;
}
}
}
}
}
// check if it should be stored to mysql
if(type == TYPE_SIP and global_livesniffer and (sipportmatrix[source] || sipportmatrix[dest] || forceSip)) {
save_live_packet(call, header, packet, saddr, source, daddr, dest, istcp, data, datalen, call->type,
dlt, sensor_id);
}
if(opt_newdir and opt_pcap_split) {
switch(type) {
case TYPE_SKINNY:
case TYPE_SIP:
if(call->getPcapSip()->isOpen()){
call->set_last_packet_time(header->ts.tv_sec);
if(type == TYPE_SIP) {
call->getPcapSip()->dump(header, packet, dlt, false, (u_char*)data, datalen, saddr, daddr, source, dest, istcp);
} else {
call->getPcapSip()->dump(header, packet, dlt);
}
}
break;
case TYPE_RTP:
case TYPE_RTCP:
if(call->getPcapRtp()->isOpen()){
call->set_last_packet_time(header->ts.tv_sec);
call->getPcapRtp()->dump(header, packet, dlt);
} else {
char pcapFilePath_spool_relative[1024];
snprintf(pcapFilePath_spool_relative , 1023, "%s/%s/%s.pcap", call->dirname().c_str(), opt_newdir ? "RTP" : "", call->get_fbasename_safe());
pcapFilePath_spool_relative[1023] = 0;
char str2[1024];
if(opt_cachedir[0] != '\0') {
snprintf(str2, 1023, "%s/%s", opt_cachedir, pcapFilePath_spool_relative);
} else {
strcpy(str2, pcapFilePath_spool_relative);
}
if(call->getPcapRtp()->open(str2, pcapFilePath_spool_relative, call->useHandle, call->useDlt)) {
if(verbosity > 3) syslog(LOG_NOTICE,"pcap_filename: [%s]\n", str2);
call->set_last_packet_time(header->ts.tv_sec);
call->getPcapRtp()->dump(header, packet, dlt);
}
}
break;
}
} else {
if (call->getPcap()->isOpen()){
call->set_last_packet_time(header->ts.tv_sec);
if(type == TYPE_SIP) {
call->getPcap()->dump(header, packet, dlt, false, (u_char*)data, datalen, saddr, daddr, source, dest, istcp);
} else {
call->getPcap()->dump(header, packet, dlt);
}
}
}
if(allocPacket) {
delete [] packet;
}
if(allocHeader) {
delete header;
}
}
inline void save_sip_packet(Call *call, struct pcap_pkthdr *header, const u_char *packet,
unsigned int saddr, int source, unsigned int daddr, int dest,
int istcp, iphdr2 *header_ip, char *data, unsigned int sipDatalen, unsigned int dataoffset, int type,
unsigned int datalen, unsigned int sipOffset,
int forceSip, int dlt, int sensor_id) {
if(istcp &&
sipDatalen && (sipDatalen < datalen || sipOffset) &&
(unsigned)datalen + sipOffset < header->caplen) {
bpf_u_int32 oldcaplen = header->caplen;
bpf_u_int32 oldlen = header->len;
u_int16_t oldHeaderIpLen = header_ip->tot_len;
unsigned long datalenWithSipOffset = datalen + sipOffset;
unsigned long diffLen = sipOffset + (datalen - sipDatalen);
unsigned long newPacketLen = oldcaplen - diffLen;
header->caplen -= diffLen;
header->len -= diffLen;
header_ip->tot_len = htons(ntohs(header_ip->tot_len) - diffLen);
u_char *newPacket = new FILE_LINE u_char[newPacketLen];
memcpy(newPacket, packet, oldcaplen - datalenWithSipOffset);
memcpy(newPacket + (oldcaplen - datalenWithSipOffset), data, sipDatalen);
iphdr2 *newHeaderIp = header_ip;
if((u_char*)header_ip > packet && (u_char*)header_ip - packet < 100) {
newHeaderIp = (iphdr2*)(newPacket + ((u_char*)header_ip - packet));
}
save_packet(call, header, newPacket, saddr, source, daddr, dest, istcp, newHeaderIp, data, sipDatalen, dataoffset, TYPE_SIP,
forceSip, dlt, sensor_id);
delete [] newPacket;
header->caplen = oldcaplen;
header->len = oldlen;
header_ip->tot_len = oldHeaderIpLen;
} else {
save_packet(call, header, packet, saddr, source, daddr, dest, istcp, header_ip, data, sipDatalen, dataoffset, TYPE_SIP,
forceSip, dlt, sensor_id);
}
}
ParsePacket _parse_packet_global;
ParsePacket *_parse_packet_process_packet;
int check_sip20(char *data, unsigned long len){
if(len < 11) {
return 0;
}
ParsePacket *parsePacket = NULL;
if(_parse_packet_process_packet && _parse_packet_process_packet->getParseData() == data) {
parsePacket = _parse_packet_process_packet;
} else if(_parse_packet_global.getParseData() == data) {
parsePacket = &_parse_packet_global;
}
if(parsePacket) {
return(parsePacket->isSip());
}
int ok;
char a = data[9];
data[9] = '\0';
//List of SIP request methods
//RFC 3261
if(strcasestr(data, "SIP/2.0")) {
ok = 1;
} else if(strcasestr(data, "INVITE")) {
ok = 1;
} else if(strcasestr(data, "ACK")) {
ok = 1;
} else if(strcasestr(data, "BYE")) {
ok = 1;
} else if(strcasestr(data, "CANCEL")) {
ok = 1;
} else if(strcasestr(data, "OPTIONS")) {
ok = 1;
} else if(strcasestr(data, "REGISTER")) {
ok = 1;
//RFC 3262
} else if(strcasestr(data, "PRACK")) {
ok = 1;
} else if(strcasestr(data, "SUBSCRIBE")) {
ok = 1;
} else if(strcasestr(data, "NOTIFY")) {
ok = 1;
} else if(strcasestr(data, "PUBLISH")) {
ok = 1;
} else if(strcasestr(data, "INFO")) {
ok = 1;
} else if(strcasestr(data, "REFER")) {
ok = 1;
} else if(strcasestr(data, "MESSAGE")) {
ok = 1;
} else if(strcasestr(data, "UPDATE")) {
ok = 1;
} else {
ok = 0;
}
data[9] = a;
return ok;
}
/* get SIP tag from memory pointed to *ptr length of len */
char * gettag(const void *ptr, unsigned long len, const char *tag, unsigned long *gettaglen, unsigned long *limitLen,
ParsePacket *parsePacket) {
bool test_pp = false;
const char *rc_pp = NULL;
long l_pp;
char _tag[1024];
if(!parsePacket) {
if(_parse_packet_process_packet && _parse_packet_process_packet->getParseData() == ptr) {
parsePacket = _parse_packet_process_packet;
} else if(_parse_packet_global.getParseData() == ptr) {
parsePacket = &_parse_packet_global;
}
}
if(parsePacket) {
rc_pp = parsePacket->getContentData(tag, &l_pp);
if((!rc_pp || l_pp <= 0) && tag[0] != '\n') {
_tag[0] = '\n';
strcpy(_tag + 1, tag);
rc_pp = parsePacket->getContentData(_tag, &l_pp);
}
if(!test_pp) {
if(rc_pp && l_pp > 0) {
*gettaglen = l_pp;
return((char*)rc_pp);
} else {
*gettaglen = 0;
return(NULL);
}
}
}
unsigned long register r, l, tl;
char *rc = NULL;
char *tmp;
char tmp2;
tmp = (char*)ptr;
bool positionOK = true;
unsigned long _limitLen = 0;
if(len <= 0) {
*gettaglen = 0;
return NULL;
}
// put '\0' at the end of the packet so it can be used with string functions. then restore the character
tmp2 = tmp[len - 1];
tmp[len - 1] = '\0';
tl = strlen(tag);
//r = (unsigned long)memmem(ptr, len, tag, tl); memmem cannot be used because SIP headers are case insensitive
r = (unsigned long)strcasestr(tmp, tag);
if(r == 0){
// tag did not match
l = 0;
} else {
//check if position ok
if(limitLen && *limitLen > 0) {
_limitLen = *limitLen;
} else {
const char *contentLengthString = "Content-Length: ";
char *contentLengthPos = strcasestr(tmp, contentLengthString);
if(contentLengthPos) {
int contentLength = atoi(contentLengthPos + strlen(contentLengthString));
if(contentLength >= 0) {
const char *endHeaderSepString = "\r\n\r\n";
char *endHeaderSepPos = (char*)memmem(tmp, len, endHeaderSepString, strlen(endHeaderSepString));
if(endHeaderSepPos) {
_limitLen = (endHeaderSepPos - tmp) + strlen(endHeaderSepString) + contentLength;
if(limitLen) {
*limitLen = _limitLen;
}
}
}
}
}
if(_limitLen &&
(unsigned long)(_limitLen + tmp) < r) {
positionOK = false;
}
if(positionOK || verbosity > 0) {
//tag matches move r pointer behind the tag name
r += tl;
tmp[len - 1] = tmp2;
l = (unsigned long)memmem((void *)r, len - (r - (unsigned long)ptr), "\r", 1);
if (l > 0){
// remove trailing \r\n and set l to length of the tag
l -= r;
} else {
// trailing \r not found try to find \n
l = (unsigned long)memmem((void *)r, len - (r - (unsigned long)ptr), "\n", 1);
if (l > 0){
// remove trailing \r\n and set l to length of the tag
l -= r;
} else {
// trailing \r not found try to find \n
l = 0;
}
}
} else {
l = 0;
}
}
tmp[len - 1] = tmp2;
// left trim spacees
if(l > 0) {
rc = (char*)r;
if (rc) {
while (((char *)ptr + len) > rc && rc[0] == ' '){
rc++;
l--;
}
}
}
if(!positionOK) {
if(verbosity > 2 && l > 0) {
char tagc[101];
strncpy(tagc, rc, min(l, 100ul));
tagc[min(l, 100ul)] = 0;
syslog(LOG_NOTICE, "bad tag position - tag: %s, content: %s\n", tag, tagc);
}
*gettaglen = 0;
} else {
*gettaglen = l;
}
if(test_pp && rc && l) {
if(_parse_packet_global.getParseData() == ptr) {
//cout << "." << flush;
string content = string(rc_pp, l_pp);
string content2 = string(rc, l);
while(content2.length() && content2[content2.length() - 1] == ' ') {
content2.resize(content2.length() - 1);
}
if(content != content2) {
cout << "GETTAG ERR " << tag << " :: " << content << " // " << string(rc, l) << endl;
//cout << (char*)ptr << endl << endl << endl << endl;
}
} else {
cout << "GETTAG --- " << tag << " :: " << string(rc, l) << endl;
}
}
return rc;
}
int get_sip_peercnam(char *data, int data_len, const char *tag, char *peername, unsigned int peername_len){
unsigned long r, r2, peername_tag_len;
char *peername_tag = gettag(data, data_len, tag, &peername_tag_len);
if(!peername_tag_len) {
goto fail_exit;
}
/* three types of URI
1) "A. G. Bell" <sip:[email protected]> ;tag=a48s
2) Anonymous <sip:[email protected]>;tag=hyh8
3) sip:[email protected];tag=887s
*/
if ((r = (unsigned long)memmem(peername_tag, peername_tag_len, "\"", 1)) == 0){
// try without ""
if ((r = (unsigned long)memmem(peername_tag, peername_tag_len, "<", 1)) == 0){
goto fail_exit;
} else {
// found case 2) Anonymous <sip:[email protected]>;tag=hyh8
r = (unsigned long)peername_tag;
}
} else {
// found case 1) "A. G. Bell" <sip:[email protected]> ;tag=a48s
r += 1;
}
if ((r2 = (unsigned long)memmem(peername_tag, peername_tag_len, "\" <", 3)) == 0){
// try without space ' '
if ((r2 = (unsigned long)memmem(peername_tag, peername_tag_len, "\"<", 2)) == 0){
// try without quotes
if ((r2 = (unsigned long)memmem(peername_tag, peername_tag_len, " <", 2)) == 0){
goto fail_exit;
}
}
}
if (r2 <= r || ((r2 - r) > (unsigned long)peername_len) ){
goto fail_exit;
}
memcpy(peername, (void*)r, MIN(r2 - r, peername_len));
peername[MIN(r2 - r, peername_len - 1)] = '\0';
return 0;
fail_exit:
strcpy(peername, "");
return 1;
}
int get_sip_peername(char *data, int data_len, const char *tag, char *peername, unsigned int peername_len){
unsigned long r, r2, peername_tag_len;
char *peername_tag = gettag(data, data_len, tag, &peername_tag_len);
if(!peername_tag_len) {
goto fail_exit;
}
if ((r = (unsigned long)memmem(peername_tag, peername_tag_len, "sip:", 4)) == 0){
if ((r = (unsigned long)memmem(peername_tag, peername_tag_len, "sips:", 4)) == 0){
goto fail_exit;
} else {
r += 5;
}
} else {
r += 4;
}
if ((r2 = (unsigned long)memmem((char*)r, peername_tag_len, "@", 1)) == 0){
goto fail_exit;
}
if (r2 <= r || ((r2 - r) > (unsigned long)peername_len) ){
goto fail_exit;
}
memcpy(peername, (void*)r, MIN(r2 - r, peername_len));
peername[MIN(r2 - r, peername_len - 1)] = '\0';
return 0;
fail_exit:
strcpy(peername, "");
return 1;
}
int get_sip_domain(char *data, int data_len, const char *tag, char *domain, unsigned int domain_len){
unsigned long r, r2, peername_tag_len;
char *peername_tag = gettag(data, data_len, tag, &peername_tag_len);
char *c;
if(!peername_tag_len) {
goto fail_exit;
}
if ((r = (unsigned long)memmem(peername_tag, peername_tag_len, "sip:", 4)) == 0){
if ((r = (unsigned long)memmem(peername_tag, peername_tag_len, "sips:", 4)) == 0){
goto fail_exit;
} else {
r += 4;
}
} else {
r += 4;
}
if ((r = (unsigned long)memmem((char*)r, peername_tag_len, "@", 1)) == 0){
goto fail_exit;
}
r += 1;
if ((r2 = (unsigned long)memmem(peername_tag, peername_tag_len, ">", 1)) == 0){
if ((r2 = (unsigned long)memmem(peername_tag, peername_tag_len + 1, "\r", 1)) == 0){
goto fail_exit;
}
}
if (r2 <= r || ((r2 - r) > (unsigned long)domain_len) ){
goto fail_exit;
}
memcpy(domain, (void*)r, MIN(r2 - r, domain_len));
domain[MIN(r2 - r, domain_len - 1)] = '\0';
// strip :port
if(!opt_domainport) {
c = strchr(domain, ':');
if(c != NULL)
*c = '\0';
}
// check if there is ; in the string (for example sip:<123@domain;user=phone>
c = strchr(domain, ';');
if(c != NULL)
*c = '\0';
return 0;
fail_exit:
strcpy(domain, "");
return 1;
}
int get_sip_branch(char *data, int data_len, const char *tag, char *branch, unsigned int branch_len){
unsigned long branch_tag_len;
char *branch_tag = gettag(data, data_len, tag, &branch_tag_len);
char *branchBegin = (char*)memmem(branch_tag, branch_tag_len, "branch=", 7);
char *branchEnd;
if(!branchBegin) {
goto fail_exit;
}
branchBegin += 7;
branchEnd = (char*)memmem(branchBegin, branch_tag_len - (branchBegin - branch_tag), ";", 1);
if(!branchEnd) {
branchEnd = branchBegin + branch_tag_len - (branchBegin - branch_tag);
}
if(branchEnd <= branchBegin || ((branchEnd - branchBegin) > branch_len)) {
goto fail_exit;
}
memcpy(branch, branchBegin, MIN(branchEnd - branchBegin, branch_len));
branch[MIN(branchEnd - branchBegin, branch_len - 1)] = '\0';
return 0;
fail_exit:
strcpy(branch, "");
return 1;