static inline void init_synonym_id( struct cell *t )
{
struct sip_msg *p_msg;
int size;
char *c;
unsigned int myrand;
if (!syn_branch) {
p_msg=t->uas.request;
if (p_msg) {
/* char value of a proxied transaction is
calculated out of header-fields forming
transaction key
*/
char_msg_val( p_msg, t->md5 );
} else {
/* char value for a UAC transaction is created
randomly -- UAC is an originating stateful element
which cannot be refreshed, so the value can be
anything
*/
/* HACK : not long enough */
myrand=rand();
c=t->md5;
size=MD5_LEN;
memset(c, '0', size );
int2reverse_hex( &c, &size, myrand );
}
}
}
/* forwards a request to dst
* parameters:
* msg - sip msg
* dst - destination name, if non-null it will be resolved and
* send_info updated with the ip/port. Even if dst is non
* null send_info must contain the protocol and if a non
* default port or non srv. lookup is desired, the port must
* be !=0
* port - used only if dst!=0 (else the port in send_info->to is used)
* send_info - value/result partially filled dest_info structure:
* - send_info->proto and comp are used
* - send_info->to will be filled (dns)
* - send_info->send_flags is filled from the message
* - if the send_socket member is null, a send_socket will be
* chosen automatically
* WARNING: don't forget to zero-fill all the unused members (a non-zero
* random id along with proto==PROTO_TCP can have bad consequences, same for
* a bogus send_socket value)
*/
int forward_request(struct sip_msg* msg, str* dst, unsigned short port,
struct dest_info* send_info)
{
unsigned int len;
char* buf;
char md5[MD5_LEN];
struct socket_info* orig_send_sock; /* initial send_sock */
int ret;
struct ip_addr ip; /* debugging only */
char proto;
#ifdef USE_DNS_FAILOVER
struct socket_info* prev_send_sock;
int err;
struct dns_srv_handle dns_srv_h;
prev_send_sock=0;
err=0;
#endif
buf=0;
orig_send_sock=send_info->send_sock;
proto=send_info->proto;
ret=0;
if(dst){
#ifdef USE_DNS_FAILOVER
if (cfg_get(core, core_cfg, use_dns_failover)){
dns_srv_handle_init(&dns_srv_h);
err=dns_sip_resolve2su(&dns_srv_h, &send_info->to, dst, port,
&proto, dns_flags);
if (err!=0){
LOG(L_ERR, "ERROR: forward_request: resolving \"%.*s\""
" failed: %s [%d]\n", dst->len, ZSW(dst->s),
dns_strerror(err), err);
ret=E_BAD_ADDRESS;
goto error;
}
}else
#endif
if (sip_hostport2su(&send_info->to, dst, port, &proto)<0){
LOG(L_ERR, "ERROR: forward_request: bad host name %.*s,"
" dropping packet\n", dst->len, ZSW(dst->s));
ret=E_BAD_ADDRESS;
goto error;
}
}/* dst */
send_info->send_flags=msg->fwd_send_flags;
/* calculate branch for outbound request; if syn_branch is turned off,
calculate is from transaction key, i.e., as an md5 of From/To/CallID/
CSeq exactly the same way as TM does; good for reboot -- than messages
belonging to transaction lost due to reboot will still be forwarded
with the same branch parameter and will be match-able downstream
if it is turned on, we don't care about reboot; we simply put a simple
value in there; better for performance
*/
if (syn_branch ) {
memcpy(msg->add_to_branch_s, "z9hG4bKcydzigwkX", 16);
msg->add_to_branch_len=16;
} else {
if (!char_msg_val( msg, md5 )) { /* parses transaction key */
LOG(L_ERR, "ERROR: forward_request: char_msg_val failed\n");
ret=E_UNSPEC;
goto error;
}
msg->hash_index=hash( msg->callid->body, get_cseq(msg)->number);
if (!branch_builder( msg->hash_index, 0, md5, 0 /* 0-th branch */,
msg->add_to_branch_s, &msg->add_to_branch_len )) {
LOG(L_ERR, "ERROR: forward_request: branch_builder failed\n");
ret=E_UNSPEC;
goto error;
}
}
/* try to send the message until success or all the ips are exhausted
* (if dns lookup is performed && the dns cache used ) */
#ifdef USE_DNS_FAILOVER
do{
#endif
if (orig_send_sock==0) /* no forced send_sock => find it **/
send_info->send_sock=get_send_socket(msg, &send_info->to, proto);
if (send_info->send_sock==0){
LOG(L_ERR, "forward_req: ERROR: cannot forward to af %d, proto %d "
"no corresponding listening socket\n",
send_info->to.s.sa_family, proto);
ret=ser_error=E_NO_SOCKET;
#ifdef USE_DNS_FAILOVER
/* continue, maybe we find a socket for some other ip */
continue;
#else
goto error;
#endif
}
#ifdef USE_DNS_FAILOVER
if (prev_send_sock!=send_info->send_sock){
/* rebuild the message only if the send_sock changed */
prev_send_sock=send_info->send_sock;
#endif
if (buf) pkg_free(buf);
send_info->proto=proto;
buf = build_req_buf_from_sip_req(msg, &len, send_info, 0);
if (!buf){
LOG(L_ERR, "ERROR: forward_request: building failed\n");
ret=E_OUT_OF_MEM; /* most probable */
goto error;
}
#ifdef USE_DNS_FAILOVER
}
#endif
/* send it! */
DBG("Sending:\n%.*s.\n", (int)len, buf);
DBG("orig. len=%d, new_len=%d, proto=%d\n",
msg->len, len, send_info->proto );
if (run_onsend(msg, send_info, buf, len)==0){
su2ip_addr(&ip, &send_info->to);
LOG(L_INFO, "forward_request: request to %s:%d(%d) dropped"
" (onsend_route)\n", ip_addr2a(&ip),
su_getport(&send_info->to), send_info->proto);
ser_error=E_OK; /* no error */
ret=E_ADM_PROHIBITED;
#ifdef USE_DNS_FAILOVER
continue; /* try another ip */
#else
goto error; /* error ? */
#endif
}
#ifdef USE_DST_BLACKLIST
if (cfg_get(core, core_cfg, use_dst_blacklist)){
if (dst_is_blacklisted(send_info, msg)){
su2ip_addr(&ip, &send_info->to);
LOG(L_DBG, "DEBUG: blacklisted destination:%s:%d (%d)\n",
ip_addr2a(&ip), su_getport(&send_info->to),
send_info->proto);
ret=ser_error=E_SEND;
#ifdef USE_DNS_FAILOVER
continue; /* try another ip */
#else
goto error;
#endif
}
}
#endif
if (msg_send(send_info, buf, len)<0){
ret=ser_error=E_SEND;
#ifdef USE_DST_BLACKLIST
(void)dst_blacklist_add(BLST_ERR_SEND, send_info, msg);
#endif
#ifdef USE_DNS_FAILOVER
continue; /* try another ip */
#else
goto error;
#endif
}else{
ret=ser_error=E_OK;
/* sent requests stats */
STATS_TX_REQUEST( msg->first_line.u.request.method_value );
/* exit succcesfully */
goto end;
}
#ifdef USE_DNS_FAILOVER
}while(dst && cfg_get(core, core_cfg, use_dns_failover) &&
dns_srv_handle_next(&dns_srv_h, err) &&
((err=dns_sip_resolve2su(&dns_srv_h, &send_info->to, dst, port,
&proto, dns_flags))==0));
if ((err!=0) && (err!=-E_DNS_EOR)){
LOG(L_ERR, "ERROR: resolving %.*s host name in uri"
" failed: %s [%d] (dropping packet)\n",
dst->len, ZSW(dst->s),
dns_strerror(err), err);
ret=ser_error=E_BAD_ADDRESS;
goto error;
}
#endif
error:
STATS_TX_DROPS;
end:
#ifdef USE_DNS_FAILOVER
if (dst && cfg_get(core, core_cfg, use_dns_failover)){
dns_srv_handle_put(&dns_srv_h);
}
#endif
if (buf) pkg_free(buf);
/* received_buf & line_buf will be freed in receive_msg by free_lump_list*/
#if defined STATS_REQ_FWD_OK || defined STATS_REQ_FWD_DROP
if(ret==0)
STATS_REQ_FWD_OK();
else
STATS_REQ_FWD_DROP();
#endif /* STATS_REQ_FWD_* */
return ret;
}
static int append_fixed_vars(struct sip_msg *msg, struct hf_wrapper **list)
{
static char tid[MD5_LEN];
str *uri;
struct sip_uri parsed_uri, oparsed_uri;
char *val;
int val_len;
/* source ip */
if (!append_var(EV_SRCIP, ip_addr2a(&msg->rcv.src_ip), 0, list)) {
LOG(L_ERR, "ERROR: append_var SRCIP failed \n");
return 0;
}
/* request URI */
uri=msg->new_uri.s && msg->new_uri.len ?
&msg->new_uri : &msg->first_line.u.request.uri;
if (!append_var(EV_RURI, uri->s, uri->len, list )) {
LOG(L_ERR, "ERROR: append_var URI failed\n");
return 0;
}
/* userpart of request URI */
if (parse_uri(uri->s, uri->len, &parsed_uri)<0) {
LOG(L_WARN, "WARNING: append_var: URI not parsed\n");
} else {
if (!append_var(EV_USER, parsed_uri.user.s,
parsed_uri.user.len, list)) {
LOG(L_ERR, "ERROR: append_var USER failed\n");
goto error;
}
}
/* original URI */
if (!append_var(EV_ORURI, msg->first_line.u.request.uri.s,
msg->first_line.u.request.uri.len, list)) {
LOG(L_ERR, "ERROR: append_var O-URI failed\n");
goto error;
}
/* userpart of request URI */
if (parse_uri(msg->first_line.u.request.uri.s,
msg->first_line.u.request.uri.len,
&oparsed_uri)<0) {
LOG(L_WARN, "WARNING: append_var: orig URI not parsed\n");
} else {
if (!append_var(EV_OUSER, oparsed_uri.user.s,
oparsed_uri.user.len, list)) {
LOG(L_ERR, "ERROR: append_var OUSER failed\n");
goto error;
}
}
/* tid, transaction id == via/branch */
if (!char_msg_val(msg, tid)) {
LOG(L_WARN, "WARNING: no tid can be determined\n");
val=0; val_len=0;
} else {
val=tid;val_len=MD5_LEN;
}
if (!append_var(EV_TID, val,val_len, list)) {
LOG(L_ERR, "ERROR: append_var TID failed\n");
goto error;
}
/* did, dialogue id == To-tag */
if (!(msg->to && get_to(msg) )) {
LOG(L_ERR, "ERROR: append_var: no to-tag\n");
val=0; val_len=0;
} else {
val=get_to(msg)->tag_value.s;
val_len=get_to(msg)->tag_value.len;
}
if (!append_var(EV_DID, val, val_len, list)) {
LOG(L_ERR, "ERROR: append_var DID failed\n");
goto error;
}
return 1;
error:
return 0;
}
struct cell* build_cell( struct sip_msg* p_msg )
{
struct cell* new_cell;
unsigned int i;
unsigned int myrand;
int size;
char *c;
struct ua_client *uac;
/* avoid 'unitialized var use' warning */
myrand=0;
/* allocs a new cell */
new_cell = (struct cell*)shm_malloc( sizeof( struct cell ) );
if ( !new_cell ) {
ser_error=E_OUT_OF_MEM;
return NULL;
}
/* filling with 0 */
memset( new_cell, 0, sizeof( struct cell ) );
/* UAS */
#ifdef EXTRA_DEBUG
new_cell->uas.response.retr_timer.tg=TG_RT;
new_cell->uas.response.fr_timer.tg=TG_FR;
#endif
new_cell->uas.response.fr_timer.payload =
new_cell->uas.response.retr_timer.payload = &(new_cell->uas.response);
new_cell->uas.response.my_T=new_cell;
/* bogdan - debug */
/*fprintf(stderr,"before clone VIA |%.*s|\n",via_len(p_msg->via1),
via_s(p_msg->via1,p_msg));*/
/* enter callback, which may potentially want to parse some stuff,
before the request is shmem-ized
*/
if (p_msg) callback_event(TMCB_REQUEST_IN, new_cell, p_msg,
p_msg->REQ_METHOD );
if (p_msg) {
new_cell->uas.request = sip_msg_cloner(p_msg);
if (!new_cell->uas.request)
goto error;
}
/* new_cell->uas.to_tag = &( get_to(new_cell->uas.request)->tag_value ); */
new_cell->uas.response.my_T = new_cell;
/* UAC */
for(i=0;i<MAX_BRANCHES;i++)
{
uac=&new_cell->uac[i];
uac->request.my_T = new_cell;
uac->request.branch = i;
#ifdef EXTRA_DEBUG
uac->request.fr_timer.tg = TG_FR;
uac->request.retr_timer.tg = TG_RT;
#endif
uac->request.retr_timer.payload =
uac->request.fr_timer.payload = &uac->request;
uac->local_cancel=uac->request;
}
/* global data for transaction */
if (p_msg) {
new_cell->hash_index = p_msg->hash_index;
} else {
/* note: unsatisfactory if
RAND_MAX < TABLE_ENTRIES
*/
myrand = rand();
new_cell->hash_index = myrand % TABLE_ENTRIES ;
}
new_cell->wait_tl.payload = new_cell;
new_cell->dele_tl.payload = new_cell;
new_cell->relaied_reply_branch = -1;
/* new_cell->T_canceled = T_UNDEFINED; */
#ifdef EXTRA_DEBUG
new_cell->wait_tl.tg=TG_WT;
new_cell->dele_tl.tg=TG_DEL;
#endif
if (!syn_branch) {
if (p_msg) {
/* char value of a proxied transaction is
calculated out of header-fileds forming
transaction key
*/
char_msg_val( p_msg, new_cell->md5 );
} else {
/* char value for a UAC transaction is created
randomly -- UAC is an originating stateful element
which cannot be refreshed, so the value can be
anything
*/
/* HACK : not long enough */
c=new_cell->md5;
size=MD5_LEN;
memset(c, '0', size );
int2reverse_hex( &c, &size, myrand );
}
}
init_cell_lock( new_cell );
return new_cell;
error:
shm_free(new_cell);
return NULL;
}
