/* introduce a new uac to transaction; returns its branch id (>=0)
or error (<0); it doesn't send a message yet -- a reply to it
might interfere with the processes of adding multiple branches
*/
static int add_uac( struct cell *t, struct sip_msg *request, str *uri,
str* next_hop, unsigned int bflags, str* path, struct proxy_l *proxy)
{
unsigned short branch;
struct sip_msg_body *body_clone=NO_BODY_CLONE_MARKER;
int do_free_proxy;
int ret;
branch=t->nr_of_outgoings;
if (branch==MAX_BRANCHES) {
LM_ERR("maximum number of branches exceeded\n");
ret=E_CFG;
goto error;
}
/* check existing buffer -- rewriting should never occur */
if (t->uac[branch].request.buffer.s) {
LM_CRIT("buffer rewrite attempt\n");
ret=ser_error=E_BUG;
goto error;
}
/* set proper RURI to request to reflect the branch */
request->new_uri=*uri;
request->parsed_uri_ok=0;
request->dst_uri=*next_hop;
request->path_vec=*path;
request->ruri_bflags=bflags;
if ( pre_print_uac_request( t, branch, request, &body_clone)!= 0 ) {
ret = -1;
goto error01;
}
/* check DNS resolution */
if (proxy){
do_free_proxy = 0;
}else {
proxy=uri2proxy( request->dst_uri.len ?
&request->dst_uri:&request->new_uri,
request->force_send_socket ?
request->force_send_socket->proto : PROTO_NONE );
if (proxy==0) {
ret=E_BAD_ADDRESS;
goto error01;
}
do_free_proxy = 1;
}
msg_callback_process(request, REQ_PRE_FORWARD, (void *)proxy);
if ( !(t->flags&T_NO_DNS_FAILOVER_FLAG) ) {
t->uac[branch].proxy = shm_clone_proxy( proxy , do_free_proxy );
if (t->uac[branch].proxy==NULL) {
ret = E_OUT_OF_MEM;
goto error02;
}
}
/* use the first address */
hostent2su( &t->uac[branch].request.dst.to,
&proxy->host, proxy->addr_idx, proxy->port ? proxy->port:SIP_PORT);
t->uac[branch].request.dst.proto = proxy->proto;
/* do print of the uac request */
if ( update_uac_dst( request, &t->uac[branch] )!=0) {
ret = ser_error;
goto error02;
}
/* things went well, move ahead */
t->uac[branch].uri.s=t->uac[branch].request.buffer.s+
request->first_line.u.request.method.len+1;
t->uac[branch].uri.len=request->new_uri.len;
t->uac[branch].br_flags = request->ruri_bflags;
t->uac[branch].added_rr = count_local_rr( request );
t->nr_of_outgoings++;
/* done! */
ret=branch;
error02:
if(do_free_proxy) {
free_proxy( proxy );
pkg_free( proxy );
}
error01:
post_print_uac_request( request, uri, next_hop, body_clone);
if (ret < 0) {
/* destroy all the bavps added, the path vector and the destination,
* since this branch will never be properly added to
* the UAC list, otherwise we'll have memory leaks - razvanc */
clean_branch(t->uac[branch]);
memset(&t->uac[branch], 0, sizeof(t->uac[branch]));
init_branch(&t->uac[branch], branch, t->wait_tl.set, t);
}
error:
return ret;
}
/*
* Send a request using data from the dialog structure
*/
int t_uac(str* method, str* headers, str* body, dlg_t* dialog,
transaction_cb cb, void* cbp,release_tmcb_param release_func)
{
union sockaddr_union to_su, new_to_su;
struct cell *new_cell;
struct cell *backup_cell;
struct retr_buf *request;
static struct sip_msg *req;
struct usr_avp **backup;
char *buf, *buf1;
int buf_len, buf_len1;
int ret, flags, sflag_bk;
int backup_route_type;
int sip_msg_len;
unsigned int hi;
struct socket_info *new_send_sock;
str h_to, h_from, h_cseq, h_callid;
struct proxy_l *proxy, *new_proxy;
unsigned short dst_changed;
ret=-1;
/*** added by dcm
* - needed by external ua to send a request within a dlg
*/
if(!dialog->hooks.next_hop && w_calculate_hooks(dialog)<0)
goto error3;
if(dialog->obp.s)
dialog->hooks.next_hop = &dialog->obp;
LM_DBG("next_hop=<%.*s>\n",dialog->hooks.next_hop->len,
dialog->hooks.next_hop->s);
/* calculate the socket corresponding to next hop */
proxy = uri2proxy( dialog->hooks.next_hop,
dialog->send_sock ? dialog->send_sock->proto : PROTO_NONE );
if (proxy==0) {
ret=E_BAD_ADDRESS;
goto error3;
}
/* use the first address */
hostent2su( &to_su,
&proxy->host, proxy->addr_idx, proxy->port ? proxy->port:SIP_PORT);
/* check/discover the send socket */
if (dialog->send_sock) {
/* if already set, the protocol of send sock must have the
the same type as the proto required by destination URI */
if (proxy->proto != dialog->send_sock->proto)
dialog->send_sock = NULL;
}
if (dialog->send_sock==NULL) {
/* get the send socket */
dialog->send_sock = get_send_socket( NULL/*msg*/, &to_su, proxy->proto);
if (!dialog->send_sock) {
LM_ERR("no corresponding socket for af %d\n", to_su.s.sa_family);
ser_error = E_NO_SOCKET;
goto error2;
}
}
LM_DBG("sending socket is %.*s \n",
dialog->send_sock->name.len,dialog->send_sock->name.s);
/* ***** Create TRANSACTION and all related ***** */
new_cell = build_cell( NULL/*msg*/, 1/*full UAS clone*/);
if (!new_cell) {
ret=E_OUT_OF_MEM;
LM_ERR("short of cell shmem\n");
goto error2;
}
/* pass the transaction flags from dialog to transaction */
new_cell->flags |= dialog->T_flags;
/* add the callback the transaction for LOCAL_COMPLETED event */
flags = TMCB_LOCAL_COMPLETED;
/* Add also TMCB_LOCAL_RESPONSE_OUT if provisional replies are desired */
if (pass_provisional_replies || pass_provisional(new_cell))
flags |= TMCB_LOCAL_RESPONSE_OUT;
if(cb && insert_tmcb(&(new_cell->tmcb_hl),flags,cb,cbp,release_func)!=1){
ret=E_OUT_OF_MEM;
LM_ERR("short of tmcb shmem\n");
goto error2;
}
if (method->len==INVITE_LEN && memcmp(method->s, INVITE, INVITE_LEN)==0)
new_cell->flags |= T_IS_INVITE_FLAG;
new_cell->flags |= T_IS_LOCAL_FLAG;
request = &new_cell->uac[0].request;
if (dialog->forced_to_su.s.sa_family == AF_UNSPEC)
request->dst.to = to_su;
else
request->dst.to = dialog->forced_to_su;
request->dst.send_sock = dialog->send_sock;
request->dst.proto = dialog->send_sock->proto;
request->dst.proto_reserved1 = 0;
hi=dlg2hash(dialog);
LOCK_HASH(hi);
insert_into_hash_table_unsafe(new_cell, hi);
UNLOCK_HASH(hi);
/* copy AVPs into transaction */
new_cell->user_avps = dialog->avps;
dialog->avps = NULL;
/* ***** Create the message buffer ***** */
buf = build_uac_req(method, headers, body, dialog, 0, new_cell, &buf_len);
if (!buf) {
LM_ERR("failed to build message\n");
ret=E_OUT_OF_MEM;
goto error1;
}
if (local_rlist.a) {
LM_DBG("building sip_msg from buffer\n");
req = buf_to_sip_msg(buf, buf_len, dialog);
if (req==NULL) {
LM_ERR("failed to build sip_msg from buffer\n");
} else {
/* set this transaction as active one */
backup_cell = get_t();
set_t( new_cell );
/* set transaction AVP list */
backup = set_avp_list( &new_cell->user_avps );
/* backup script flags */
sflag_bk = getsflags();
/* disable parallel forking */
set_dset_state( 0 /*disable*/);
/* run the route */
swap_route_type( backup_route_type, LOCAL_ROUTE);
run_top_route( local_rlist.a, req);
set_route_type( backup_route_type );
/* transfer current message context back to t */
new_cell->uac[0].br_flags = getb0flags(req);
/* restore the prevoius active transaction */
set_t( backup_cell );
set_dset_state( 1 /*enable*/);
setsflagsval(sflag_bk);
set_avp_list( backup );
/* check for changes - if none, do not regenerate the buffer */
dst_changed = 1;
if (req->new_uri.s || req->force_send_socket!=dialog->send_sock ||
req->dst_uri.len != dialog->hooks.next_hop->len ||
memcmp(req->dst_uri.s,dialog->hooks.next_hop->s,req->dst_uri.len) ||
(dst_changed=0)==0 || req->add_rm || req->body_lumps){
new_send_sock = NULL;
/* do we also need to change the destination? */
if (dst_changed) {
/* calculate the socket corresponding to next hop */
new_proxy = uri2proxy(
req->dst_uri.s ? &(req->dst_uri) : &req->new_uri,
PROTO_NONE );
if (new_proxy==0)
goto abort_update;
/* use the first address */
hostent2su( &new_to_su,
&new_proxy->host, new_proxy->addr_idx,
new_proxy->port ? new_proxy->port:SIP_PORT);
/* get the send socket */
new_send_sock = get_send_socket( req, &new_to_su,
new_proxy->proto);
if (!new_send_sock) {
free_proxy( new_proxy );
pkg_free( new_proxy );
LM_ERR("no socket found for the new destination\n");
goto abort_update;
}
}
/* if interface change, we need to re-build the via */
if (new_send_sock && new_send_sock != dialog->send_sock) {
LM_DBG("Interface change in local route -> "
"rebuilding via\n");
if (!del_lump(req,req->h_via1->name.s - req->buf,
req->h_via1->len,0)) {
LM_ERR("Failed to remove initial via \n");
goto abort_update;
}
memcpy(req->add_to_branch_s,req->via1->branch->value.s,
req->via1->branch->value.len);
req->add_to_branch_len = req->via1->branch->value.len;
/* update also info about new destination and send sock */
dialog->send_sock = new_send_sock;
free_proxy( proxy );
pkg_free( proxy );
proxy = new_proxy;
request->dst.send_sock = new_send_sock;
request->dst.proto = new_send_sock->proto;
request->dst.proto_reserved1 = 0;
/* build the shm buffer now */
set_init_lump_flags(LUMPFLAG_BRANCH);
buf1 = build_req_buf_from_sip_req(req,
(unsigned int*)&buf_len1,
new_send_sock, new_send_sock->proto,
MSG_TRANS_SHM_FLAG);
reset_init_lump_flags();
del_flaged_lumps( &req->add_rm, LUMPFLAG_BRANCH);
} else {
LM_DBG("Change in local route -> rebuilding buffer\n");
/* build the shm buffer now */
buf1 = build_req_buf_from_sip_req(req,
(unsigned int*)&buf_len1,
dialog->send_sock, dialog->send_sock->proto,
MSG_TRANS_SHM_FLAG|MSG_TRANS_NOVIA_FLAG);
/* now as it used, hide the original VIA header */
del_lump(req,req->h_via1->name.s - req->buf,
req->h_via1->len, 0);
}
if (!buf1) {
LM_ERR("no more shm mem\n");
/* keep original buffer */
goto abort_update;
}
/* update shortcuts */
if(!req->add_rm && !req->new_uri.s) {
/* headers are not affected, simply tranlate */
new_cell->from.s = new_cell->from.s - buf + buf1;
new_cell->to.s = new_cell->to.s - buf + buf1;
new_cell->callid.s = new_cell->callid.s - buf + buf1;
new_cell->cseq_n.s = new_cell->cseq_n.s - buf + buf1;
} else {
/* use heavy artilery :D */
if (extract_ftc_hdrs( buf1, buf_len1, &h_from, &h_to,
&h_cseq, &h_callid)!=0 ) {
LM_ERR("failed to update shortcut pointers\n");
shm_free(buf1);
goto abort_update;
}
new_cell->from = h_from;
new_cell->to = h_to;
new_cell->callid = h_callid;
new_cell->cseq_n = h_cseq;
}
/* here we rely on how build_uac_req()
builds the first line */
new_cell->uac[0].uri.s = buf1 +
req->first_line.u.request.method.len + 1;
new_cell->uac[0].uri.len = GET_RURI(req)->len;
/* update also info about new destination and send sock */
if (new_send_sock)
request->dst.to = new_to_su;
shm_free(buf);
buf = buf1;
buf_len = buf_len1;
/* use new buffer */
} else {
/* no changes over the message, buffer is already generated,
just hide the original VIA for potential further branches */
del_lump(req,req->h_via1->name.s-req->buf,req->h_via1->len,0);
}
abort_update:
/* save the SIP message into transaction */
new_cell->uas.request = sip_msg_cloner( req, &sip_msg_len, 1);
if (new_cell->uas.request==NULL) {
/* reset any T triggering */
new_cell->on_negative = 0;
new_cell->on_reply = 0;
} else {
new_cell->uas.end_request=
((char*)new_cell->uas.request)+sip_msg_len;
}
/* no parallel support in UAC transactions */
new_cell->on_branch = 0;
free_sip_msg(req);
}
}
/* for DNS based failover, copy the DNS proxy into transaction */
if (!disable_dns_failover) {
new_cell->uac[0].proxy = shm_clone_proxy( proxy, 1/*do_free*/);
if (new_cell->uac[0].proxy==NULL)
LM_ERR("failed to store DNS info -> no DNS based failover\n");
}
new_cell->method.s = buf;
new_cell->method.len = method->len;
request->buffer.s = buf;
request->buffer.len = buf_len;
new_cell->nr_of_outgoings++;
if(last_localT) {
*last_localT = new_cell;
REF_UNSAFE(new_cell);
}
if (SEND_BUFFER(request) == -1) {
LM_ERR("attempt to send to '%.*s' failed\n",
dialog->hooks.next_hop->len,
dialog->hooks.next_hop->s);
}
if (method->len==ACK_LEN && memcmp(method->s, ACK, ACK_LEN)==0 ) {
t_release_transaction(new_cell);
} else {
start_retr(request);
}
free_proxy( proxy );
pkg_free( proxy );
return 1;
error1:
LOCK_HASH(hi);
remove_from_hash_table_unsafe(new_cell);
UNLOCK_HASH(hi);
free_cell(new_cell);
error2:
free_proxy( proxy );
pkg_free( proxy );
error3:
return ret;
}
/* introduce a new uac to transaction; returns its branch id (>=0)
or error (<0); it doesn't send a message yet -- a reply to it
might interfere with the processes of adding multiple branches
*/
static int add_uac( struct cell *t, struct sip_msg *request, str *uri,
str* next_hop, str* path, struct proxy_l *proxy)
{
unsigned short branch;
int do_free_proxy;
int ret;
branch=t->nr_of_outgoings;
if (branch==MAX_BRANCHES) {
LM_ERR("maximum number of branches exceeded\n");
ret=E_CFG;
goto error;
}
/* check existing buffer -- rewriting should never occur */
if (t->uac[branch].request.buffer.s) {
LM_CRIT("buffer rewrite attempt\n");
ret=ser_error=E_BUG;
goto error;
}
/* set proper RURI to request to reflect the branch */
request->new_uri=*uri;
request->parsed_uri_ok=0;
request->dst_uri=*next_hop;
request->path_vec=*path;
if ( pre_print_uac_request( t, branch, request)!= 0 ) {
ret = -1;
goto error01;
}
/* check DNS resolution */
if (proxy){
do_free_proxy = 0;
}else {
proxy=uri2proxy( request->dst_uri.len ?
&request->dst_uri:&request->new_uri, PROTO_NONE );
if (proxy==0) {
ret=E_BAD_ADDRESS;
goto error01;
}
do_free_proxy = 1;
}
msg_callback_process(request, REQ_PRE_FORWARD, (void *)proxy);
if ( !(t->flags&T_NO_DNS_FAILOVER_FLAG) ) {
t->uac[branch].proxy = shm_clone_proxy( proxy , do_free_proxy );
if (t->uac[branch].proxy==NULL) {
ret = E_OUT_OF_MEM;
goto error02;
}
}
/* use the first address */
hostent2su( &t->uac[branch].request.dst.to,
&proxy->host, proxy->addr_idx, proxy->port ? proxy->port:SIP_PORT);
t->uac[branch].request.dst.proto = proxy->proto;
if ( update_uac_dst( request, &t->uac[branch] )!=0) {
ret = ser_error;
goto error02;
}
/* things went well, move ahead */
t->uac[branch].uri.s=t->uac[branch].request.buffer.s+
request->first_line.u.request.method.len+1;
t->uac[branch].uri.len=request->new_uri.len;
t->uac[branch].br_flags = getb0flags();
t->uac[branch].added_rr = count_local_rr( request );
t->nr_of_outgoings++;
/* done! */
ret=branch;
error02:
if(do_free_proxy) {
free_proxy( proxy );
pkg_free( proxy );
}
error01:
post_print_uac_request( request, uri, next_hop);
error:
return ret;
}
