/*
* Create Via header
*/
static inline int assemble_via(str* dest, struct cell* t,
struct dest_info* dst, int branch)
{
static char branch_buf[MAX_BRANCH_PARAM_LEN];
char* via;
int len;
unsigned int via_len;
str branch_str;
struct hostport hp;
if (!t_calc_branch(t, branch, branch_buf, &len)) {
LM_ERR("branch calculation failed\n");
return -1;
}
branch_str.s = branch_buf;
branch_str.len = len;
#ifdef XL_DEBUG
printf("!!!proto: %d\n", sock->proto);
#endif
set_hostport(&hp, 0);
via = via_builder(&via_len, NULL, dst, &branch_str, 0, &hp);
if (!via) {
LM_ERR("via building failed\n");
return -2;
}
dest->s = via;
dest->len = via_len;
return 0;
}
char *print_uac_request( struct cell *t, struct sip_msg *i_req,
int branch, str *uri, unsigned int *len, struct socket_info *send_sock,
enum sip_protos proto )
{
char *buf, *shbuf;
shbuf=0;
/* ... we calculate branch ... */
if (!t_calc_branch(t, branch, i_req->add_to_branch_s,
&i_req->add_to_branch_len ))
{
LOG(L_ERR, "ERROR: print_uac_request: branch computation failed\n");
goto error01;
}
/* ... update uri ... */
i_req->new_uri=*uri;
/* run the specific callbacks for this transaction */
run_trans_callbacks( TMCB_REQUEST_FWDED , t, i_req, 0, -i_req->REQ_METHOD);
/* ... and build it now */
buf=build_req_buf_from_sip_req( i_req, len, send_sock, proto );
#ifdef DBG_MSG_QA
if (buf[*len-1]==0) {
LOG(L_ERR, "ERROR: print_uac_request: sanity check failed\n");
abort();
}
#endif
if (!buf) {
LOG(L_ERR, "ERROR: print_uac_request: no pkg_mem\n");
ser_error=E_OUT_OF_MEM;
goto error01;
}
/* clean Via's we created now -- they would accumulate for
other branches and for shmem i_req they would mix up
shmem with pkg_mem
*/
free_via_clen_lump(&i_req->add_rm);
shbuf=(char *)shm_malloc(*len);
if (!shbuf) {
ser_error=E_OUT_OF_MEM;
LOG(L_ERR, "ERROR: print_uac_request: no shmem\n");
goto error02;
}
memcpy( shbuf, buf, *len );
error02:
pkg_free( buf );
error01:
return shbuf;
}
static inline int pre_print_uac_request( struct cell *t, int branch,
struct sip_msg *request, struct sip_msg_body **body_clone)
{
int backup_route_type;
struct usr_avp **backup_list;
char *p;
/* ... we calculate branch ... */
if (!t_calc_branch(t, branch, request->add_to_branch_s,
&request->add_to_branch_len ))
{
LM_ERR("branch computation failed\n");
goto error;
}
/* from now on, flag all new lumps with LUMPFLAG_BRANCH flag in order to
* be able to remove them later --bogdan */
set_init_lump_flags(LUMPFLAG_BRANCH);
/* copy path vector into branch */
if (request->path_vec.len) {
t->uac[branch].path_vec.s =
shm_realloc(t->uac[branch].path_vec.s, request->path_vec.len+1);
if (t->uac[branch].path_vec.s==NULL) {
LM_ERR("shm_realloc failed\n");
goto error;
}
t->uac[branch].path_vec.len = request->path_vec.len;
memcpy( t->uac[branch].path_vec.s, request->path_vec.s,
request->path_vec.len+1);
}
/* do the same for the advertised port & address */
if (request->set_global_address.len) {
t->uac[branch].adv_address.s = shm_realloc(t->uac[branch].adv_address.s,
request->set_global_address.len+1);
if (t->uac[branch].adv_address.s==NULL) {
LM_ERR("shm_realloc failed for storing the advertised address "
"(len=%d)\n",request->set_global_address.len);
goto error;
}
t->uac[branch].adv_address.len = request->set_global_address.len;
memcpy( t->uac[branch].adv_address.s, request->set_global_address.s,
request->set_global_address.len+1);
}
if (request->set_global_port.len) {
t->uac[branch].adv_port.s = shm_realloc(t->uac[branch].adv_port.s,
request->set_global_port.len+1);
if (t->uac[branch].adv_port.s==NULL) {
LM_ERR("shm_realloc failed for storing the advertised port "
"(len=%d)\n",request->set_global_port.len);
goto error;
}
t->uac[branch].adv_port.len = request->set_global_port.len;
memcpy( t->uac[branch].adv_port.s, request->set_global_port.s,
request->set_global_port.len+1);
}
/********** run route & callback ************/
/* run branch route, if any; run it before RURI's DNS lookup
* to allow to be changed --bogdan */
if (t->on_branch) {
/* need to pkg_malloc the dst_uri */
if ( request->dst_uri.s && request->dst_uri.len>0 ) {
if ( (p=pkg_malloc(request->dst_uri.len))==0 ) {
LM_ERR("no more pkg mem\n");
ser_error=E_OUT_OF_MEM;
goto error;
}
memcpy( p, request->dst_uri.s, request->dst_uri.len);
request->dst_uri.s = p;
}
/* need to pkg_malloc the new_uri */
if ( (p=pkg_malloc(request->new_uri.len))==0 ) {
LM_ERR("no more pkg mem\n");
ser_error=E_OUT_OF_MEM;
goto error;
}
memcpy( p, request->new_uri.s, request->new_uri.len);
request->new_uri.s = p;
request->parsed_uri_ok = 0;
/* make a clone of the original body, to restore it later */
if (clone_sip_msg_body( request, NULL, body_clone, 0)!=0) {
LM_ERR("faile to clone the body, branch route changes will be"
" preserved\n");
}
/* make available the avp list from transaction */
backup_list = set_avp_list( &t->user_avps );
/* run branch route */
swap_route_type( backup_route_type, BRANCH_ROUTE);
_tm_branch_index = branch;
if(run_top_route(sroutes->branch[t->on_branch].a,request)&ACT_FL_DROP){
LM_DBG("dropping branch <%.*s>\n", request->new_uri.len,
request->new_uri.s);
_tm_branch_index = 0;
/* restore the route type */
set_route_type( backup_route_type );
/* restore original avp list */
set_avp_list( backup_list );
goto error;
}
_tm_branch_index = 0;
/* restore the route type */
set_route_type( backup_route_type );
/* restore original avp list */
set_avp_list( backup_list );
}
/* run the specific callbacks for this transaction */
run_trans_callbacks( TMCB_REQUEST_FWDED, t, request, 0,
-request->REQ_METHOD);
/* copy dst_uri into branch (after branch route possible updated it) */
if (request->dst_uri.len) {
t->uac[branch].duri.s =
shm_realloc(t->uac[branch].duri.s, request->dst_uri.len);
if (t->uac[branch].duri.s==NULL) {
LM_ERR("shm_realloc failed\n");
goto error;
}
t->uac[branch].duri.len = request->dst_uri.len;
memcpy( t->uac[branch].duri.s,request->dst_uri.s,request->dst_uri.len);
}
return 0;
error:
return -1;
}
/* Build a local request based on a previous request; main
* customers of this function are local ACK and local CANCEL
*/
char *build_local(struct cell *Trans,unsigned int branch,
unsigned int *len, char *method, int method_len, str *to
#ifdef CANCEL_REASON_SUPPORT
, struct cancel_reason* reason
#endif /* CANCEL_REASON_SUPPORT */
)
{
char *cancel_buf, *p, *via;
unsigned int via_len;
struct hdr_field *hdr;
char branch_buf[MAX_BRANCH_PARAM_LEN];
int branch_len;
str branch_str;
str via_id;
struct hostport hp;
#ifdef CANCEL_REASON_SUPPORT
int reason_len, code_len;
struct hdr_field *reas1, *reas_last;
#endif /* CANCEL_REASON_SUPPORT */
/* init */
via_id.s=0;
via_id.len=0;
/* method, separators, version: "CANCEL sip:[email protected] SIP/2.0" */
*len=SIP_VERSION_LEN + method_len + 2 /* spaces */ + CRLF_LEN;
*len+=Trans->uac[branch].uri.len;
/*via*/
if (!t_calc_branch(Trans, branch,
branch_buf, &branch_len ))
goto error;
branch_str.s=branch_buf;
branch_str.len=branch_len;
set_hostport(&hp, (is_local(Trans))?0:(Trans->uas.request));
#ifdef USE_TCP
if (!is_local(Trans) && ((Trans->uas.request->rcv.proto==PROTO_TCP)
#ifdef USE_TLS
|| (Trans->uas.request->rcv.proto==PROTO_TLS)
#endif /* USE_TLS */
)){
if ((via_id.s=id_builder(Trans->uas.request,
(unsigned int*)&via_id.len))==0){
LM_ERR("id builder failed\n");
/* try to continue without id */
}
}
#endif /* USE_TCP */
via=via_builder(&via_len, NULL, &Trans->uac[branch].request.dst,
&branch_str, via_id.s?&via_id:0 , &hp );
/* via_id.s not needed anylonger => free it */
if (via_id.s) {
pkg_free(via_id.s);
via_id.s=0;
via_id.len=0;
}
if (!via) {
LM_ERR("no via header got from builder\n");
goto error;
}
*len+= via_len;
/*headers*/
*len+=Trans->from.len+Trans->callid.len+to->len+
+Trans->cseq_n.len+1+method_len+CRLF_LEN+MAXFWD_HEADER_LEN;
/* copy'n'paste Route headers */
if (!is_local(Trans)) {
for ( hdr=Trans->uas.request->headers ; hdr ; hdr=hdr->next )
if (hdr->type==HDR_ROUTE_T)
*len+=hdr->len;
}
/* User Agent */
if (server_signature) {
*len += user_agent_hdr.len + CRLF_LEN;
}
/* Content Length, EoM */
*len+=CONTENT_LENGTH_LEN+1 + CRLF_LEN;
#ifdef CANCEL_REASON_SUPPORT
reason_len = 0;
reas1 = 0;
reas_last = 0;
/* compute reason size (if no reason or disabled => reason_len == 0)*/
if (reason && reason->cause != CANCEL_REAS_UNKNOWN){
if (likely(reason->cause > 0 &&
cfg_get(tm, tm_cfg, local_cancel_reason))){
/* Reason: SIP;cause=<reason->cause>[;text=<reason->u.text.s>] */
reason_len = REASON_PREFIX_LEN + USHORT2SBUF_MAX_LEN +
(reason->u.text.s?
REASON_TEXT_LEN + 1 + reason->u.text.len + 1 : 0) +
CRLF_LEN;
} else if (likely(reason->cause == CANCEL_REAS_PACKED_HDRS &&
!(Trans->flags & T_NO_E2E_CANCEL_REASON))) {
reason_len = reason->u.packed_hdrs.len;
} else if (reason->cause == CANCEL_REAS_RCVD_CANCEL &&
reason->u.e2e_cancel &&
!(Trans->flags & T_NO_E2E_CANCEL_REASON)) {
/* parse the entire cancel, to get all the Reason headers */
if(parse_headers(reason->u.e2e_cancel, HDR_EOH_F, 0)<0) {
LM_WARN("failed to parse headers\n");
}
for(hdr=get_hdr(reason->u.e2e_cancel, HDR_REASON_T), reas1=hdr;
hdr; hdr=next_sibling_hdr(hdr)) {
/* hdr->len includes CRLF */
reason_len += hdr->len;
reas_last=hdr;
}
} else if (unlikely(reason->cause < CANCEL_REAS_MIN))
LM_BUG("unhandled reason cause %d\n", reason->cause);
}
*len+= reason_len;
#endif /* CANCEL_REASON_SUPPORT */
*len+= CRLF_LEN; /* end of msg. */
cancel_buf=shm_malloc( *len+1 );
if (!cancel_buf) {
LM_ERR("cannot allocate memory\n");
goto error01;
}
p = cancel_buf;
append_str( p, method, method_len );
append_str( p, " ", 1 );
append_str( p, Trans->uac[branch].uri.s, Trans->uac[branch].uri.len);
append_str( p, " " SIP_VERSION CRLF, 1+SIP_VERSION_LEN+CRLF_LEN );
/* insert our via */
append_str(p,via,via_len);
/*other headers*/
append_str( p, Trans->from.s, Trans->from.len );
append_str( p, Trans->callid.s, Trans->callid.len );
append_str( p, to->s, to->len );
append_str( p, Trans->cseq_n.s, Trans->cseq_n.len );
append_str( p, " ", 1 );
append_str( p, method, method_len );
append_str( p, CRLF, CRLF_LEN );
append_str( p, MAXFWD_HEADER, MAXFWD_HEADER_LEN );
if (!is_local(Trans)) {
for ( hdr=Trans->uas.request->headers ; hdr ; hdr=hdr->next )
if(hdr->type==HDR_ROUTE_T) {
append_str(p, hdr->name.s, hdr->len );
}
}
/* User Agent header */
if (server_signature) {
append_str(p, user_agent_hdr.s, user_agent_hdr.len );
append_str(p, CRLF, CRLF_LEN );
}
/* Content Length */
append_str(p, CONTENT_LENGTH "0" CRLF, CONTENT_LENGTH_LEN + 1 + CRLF_LEN);
#ifdef CANCEL_REASON_SUPPORT
/* add reason if needed */
if (reason_len) {
if (likely(reason->cause > 0)) {
append_str(p, REASON_PREFIX, REASON_PREFIX_LEN);
code_len=ushort2sbuf(reason->cause, p,
*len-(int)(p-cancel_buf));
if (unlikely(code_len==0))
LM_BUG("not enough space to write reason code");
p+=code_len;
if (reason->u.text.s){
append_str(p, REASON_TEXT, REASON_TEXT_LEN);
*p='"'; p++;
append_str(p, reason->u.text.s, reason->u.text.len);
*p='"'; p++;
}
append_str(p, CRLF, CRLF_LEN);
} else if (likely(reason->cause == CANCEL_REAS_PACKED_HDRS)) {
append_str(p, reason->u.packed_hdrs.s, reason->u.packed_hdrs.len);
} else if (reason->cause == CANCEL_REAS_RCVD_CANCEL) {
for(hdr=reas1; hdr; hdr=next_sibling_hdr(hdr)) {
/* hdr->len includes CRLF */
append_str(p, hdr->name.s, hdr->len);
if (likely(hdr==reas_last))
break;
}
}
}
#endif /* CANCEL_REASON_SUPPORT */
append_str(p, CRLF, CRLF_LEN); /* msg. end */
*p=0;
pkg_free(via);
return cancel_buf;
error01:
pkg_free(via);
error:
return NULL;
}
/**
* build CANCEL from UAC side
*/
char *build_uac_cancel(str *headers,str *body,struct cell *cancelledT,
unsigned int branch, unsigned int *len, struct dest_info* dst)
{
char *cancel_buf, *p;
char branch_buf[MAX_BRANCH_PARAM_LEN];
str branch_str;
struct hostport hp;
str content_length, via;
LM_DBG("sing FROM=<%.*s>, TO=<%.*s>, CSEQ_N=<%.*s>\n",
cancelledT->from.len, cancelledT->from.s, cancelledT->to.len,
cancelledT->to.s, cancelledT->cseq_n.len, cancelledT->cseq_n.s);
branch_str.s=branch_buf;
if (!t_calc_branch(cancelledT, branch, branch_str.s, &branch_str.len )){
LM_ERR("failed to create branch !\n");
goto error;
}
set_hostport(&hp,0);
if (assemble_via(&via, cancelledT, dst, branch) < 0) {
LM_ERR("Error while assembling Via\n");
return 0;
}
/* method, separators, version */
*len=CANCEL_LEN + 2 /* spaces */ +SIP_VERSION_LEN + CRLF_LEN;
*len+=cancelledT->uac[branch].uri.len;
/*via*/
*len+= via.len;
/*From*/
*len+=cancelledT->from.len;
/*To*/
*len+=cancelledT->to.len;
/*CallId*/
*len+=cancelledT->callid.len;
/*CSeq*/
*len+=cancelledT->cseq_n.len+1+CANCEL_LEN+CRLF_LEN;
/* User Agent */
if (server_signature) {
*len += USER_AGENT_LEN + CRLF_LEN;
}
/* Content Length */
if (print_content_length(&content_length, body) < 0) {
LM_ERR("failed to print content-length\n");
return 0;
}
/* Content-Length */
*len += (body ? (CONTENT_LENGTH_LEN + content_length.len + CRLF_LEN) : 0);
/*Additional headers*/
*len += (headers ? headers->len : 0);
/*EoM*/
*len+= CRLF_LEN;
/* Message body */
*len += (body ? body->len : 0);
cancel_buf=shm_malloc( *len+1 );
if (!cancel_buf)
{
LM_ERR("no more share memory\n");
goto error01;
}
p = cancel_buf;
memapp( p, CANCEL, CANCEL_LEN );
*(p++) = ' ';
memapp( p, cancelledT->uac[branch].uri.s,
cancelledT->uac[branch].uri.len);
memapp( p, " " SIP_VERSION CRLF, 1+SIP_VERSION_LEN+CRLF_LEN );
/* insert our via */
memapp(p,via.s,via.len);
/*other headers*/
memapp( p, cancelledT->from.s, cancelledT->from.len );
memapp( p, cancelledT->callid.s, cancelledT->callid.len );
memapp( p, cancelledT->to.s, cancelledT->to.len );
memapp( p, cancelledT->cseq_n.s, cancelledT->cseq_n.len );
*(p++) = ' ';
memapp( p, CANCEL, CANCEL_LEN );
memapp( p, CRLF, CRLF_LEN );
/* User Agent header */
if (server_signature) {
memapp(p,USER_AGENT CRLF, USER_AGENT_LEN+CRLF_LEN );
}
/* Content Length*/
if (body) {
memapp(p, CONTENT_LENGTH, CONTENT_LENGTH_LEN);
memapp(p, content_length.s, content_length.len);
memapp(p, CRLF, CRLF_LEN);
}
if(headers && headers->len){
memapp(p,headers->s,headers->len);
}
/*EoM*/
memapp(p,CRLF,CRLF_LEN);
if(body && body->len){
memapp(p,body->s,body->len);
}
*p=0;
pkg_free(via.s);
return cancel_buf;
error01:
pkg_free(via.s);
error:
return NULL;
}
/*
* The function creates an ACK to 200 OK. Route set will be created
* and parsed and the dst parameter will contain the destination to which
* the request should be send. The function is used by tm when it
* generates local ACK to 200 OK (on behalf of applications using uac)
*/
char *build_dlg_ack(struct sip_msg* rpl, struct cell *Trans,
unsigned int branch, str *hdrs, str *body,
unsigned int *len, struct dest_info* dst)
{
char *req_buf, *p, *via;
unsigned int via_len;
char branch_buf[MAX_BRANCH_PARAM_LEN];
int branch_len;
str branch_str;
struct hostport hp;
struct rte* list;
str contact, ruri, *cont;
str next_hop;
str body_len;
str _to, *to = &_to;
#ifdef USE_DNS_FAILOVER
struct dns_srv_handle dns_h;
#endif
#ifdef WITH_AS_SUPPORT
/* With AS support, TM allows for external modules to generate building of
* the ACK; in this case, the ACK's retransmission buffer is built once
* and kept in memory (to help when retransmitted 2xx are received and ACK
* must be resent).
* Allocation of the string raw buffer that holds the ACK is piggy-backed
* with allocation of the retransmission buffer (since both have the same
* life-cycle): both the string buffer and retransm. buffer are placed
* into the same allocated chunk of memory (retr. buffer first, string
* buffer follows).In this case, the 'len' param is used as in-out
* parameter: 'in' to give the extra space needed by the retr. buffer,
* 'out' to return the lenght of the allocated string buffer.
*/
unsigned offset = *len;
#endif
if (parse_headers(rpl, HDR_EOH_F, 0) == -1 || !rpl->to) {
LM_ERR("Error while parsing headers.\n");
return 0;
} else {
_to.s = rpl->to->name.s;
_to.len = rpl->to->len;
}
if (get_contact_uri(rpl, &contact) < 0) {
return 0;
}
if (eval_uac_routing(rpl, &Trans->uac[branch].request, &contact,
&list, &ruri, &next_hop) < 0) {
LM_ERR("failed to evaluate routing elements.\n");
return 0;
}
LM_DBG("ACK RURI: `%.*s', NH: `%.*s'.\n", STR_FMT(&ruri),
STR_FMT(&next_hop));
if ((contact.s != ruri.s) || (contact.len != ruri.len)) {
/* contact != ruri means that the next
* hop is a strict router, cont will be non-zero
* and print_routeset will append it at the end
* of the route set
*/
cont = &contact;
} else {
/* Next hop is a loose router, nothing to append */
cont = 0;
}
/* method, separators, version: "ACK sip:[email protected] SIP/2.0" */
*len = SIP_VERSION_LEN + ACK_LEN + 2 /* spaces */ + CRLF_LEN;
*len += ruri.len;
/* dst */
switch(cfg_get(tm, tm_cfg, local_ack_mode)){
case 1:
/* send the local 200 ack to the same dst as the corresp. invite*/
*dst=Trans->uac[branch].request.dst;
break;
case 2:
/* send the local 200 ack to the same dst as the 200 reply source*/
init_dst_from_rcv(dst, &rpl->rcv);
dst->send_flags=rpl->fwd_send_flags;
break;
case 0:
default:
/* rfc conformant behaviour: use the next_hop determined from the
* contact and the route set */
#ifdef USE_DNS_FAILOVER
if (cfg_get(core, core_cfg, use_dns_failover)){
dns_srv_handle_init(&dns_h);
if ((uri2dst(&dns_h , dst, rpl, &next_hop, PROTO_NONE)==0) ||
(dst->send_sock==0)){
dns_srv_handle_put(&dns_h);
LM_ERR("no socket found\n");
goto error;
}
dns_srv_handle_put(&dns_h); /* not needed any more */
}else{
if ((uri2dst(0 , dst, rpl, &next_hop, PROTO_NONE)==0) ||
(dst->send_sock==0)){
LM_ERR("no socket found\n");
goto error;
}
}
#else /* USE_DNS_FAILOVER */
if ( (uri2dst( dst, rpl, &next_hop, PROTO_NONE)==0) ||
(dst->send_sock==0)){
LM_ERR("no socket found\n");
goto error;
}
#endif /* USE_DNS_FAILOVER */
break;
}
/* via */
if (!t_calc_branch(Trans, branch, branch_buf, &branch_len)) goto error;
branch_str.s = branch_buf;
branch_str.len = branch_len;
set_hostport(&hp, 0);
via = via_builder(&via_len, NULL, dst, &branch_str, 0, &hp);
if (!via) {
LM_ERR("No via header got from builder\n");
goto error;
}
*len+= via_len;
/* headers */
*len += Trans->from.len + Trans->callid.len + to->len + Trans->cseq_n.len + 1 + ACK_LEN + CRLF_LEN;
/* copy'n'paste Route headers */
*len += calc_routeset_len(list, cont);
/* User Agent */
if (server_signature) *len += user_agent_hdr.len + CRLF_LEN;
/* extra headers */
if (hdrs)
*len += hdrs->len;
/* body */
if (body) {
body_len.s = int2str(body->len, &body_len.len);
*len += body->len;
} else {
body_len.len = 0;
body_len.s = NULL; /*4gcc*/
*len += 1; /* for the (Cont-Len:) `0' */
}
/* Content Length, EoM */
*len += CONTENT_LENGTH_LEN + body_len.len + CRLF_LEN + CRLF_LEN;
#if WITH_AS_SUPPORT
req_buf = shm_malloc(offset + *len + 1);
req_buf += offset;
#else
req_buf = shm_malloc(*len + 1);
#endif
if (!req_buf) {
LM_ERR("Cannot allocate memory (%u+1)\n", *len);
goto error01;
}
p = req_buf;
append_str( p, ACK, ACK_LEN );
append_str( p, " ", 1 );
append_str(p, ruri.s, ruri.len);
append_str( p, " " SIP_VERSION CRLF, 1 + SIP_VERSION_LEN + CRLF_LEN);
/* insert our via */
append_str(p, via, via_len);
/*other headers*/
append_str(p, Trans->from.s, Trans->from.len);
append_str(p, Trans->callid.s, Trans->callid.len);
append_str(p, to->s, to->len);
append_str(p, Trans->cseq_n.s, Trans->cseq_n.len);
append_str( p, " ", 1 );
append_str( p, ACK, ACK_LEN);
append_str(p, CRLF, CRLF_LEN);
/* Routeset */
p = print_rs(p, list, cont);
/* User Agent header */
if (server_signature) {
append_str(p, user_agent_hdr.s, user_agent_hdr.len);
append_str(p, CRLF, CRLF_LEN);
}
/* extra headers */
if (hdrs)
append_str(p, hdrs->s, hdrs->len);
/* Content Length, EoH, (body) */
if (body) {
append_str(p, CONTENT_LENGTH, CONTENT_LENGTH_LEN);
append_str(p, body_len.s, body_len.len);
append_str(p, /*end crr. header*/CRLF /*EoH*/CRLF, CRLF_LEN +
CRLF_LEN);
append_str(p, body->s, body->len);
} else {
append_str(p, CONTENT_LENGTH "0" CRLF CRLF,
CONTENT_LENGTH_LEN + 1 + CRLF_LEN + CRLF_LEN);
}
/* EoM */
*p = 0;
pkg_free(via);
free_rte_list(list);
return req_buf;
error01:
pkg_free(via);
error:
free_rte_list(list);
return 0;
}
/*
* The function creates an ACK for a local INVITE. If 200 OK, route set
* will be created and parsed
*/
char *build_dlg_ack(struct sip_msg* rpl, struct cell *Trans,
unsigned int branch, str* to, unsigned int *len)
{
char *req_buf, *p, *via;
unsigned int via_len;
char branch_buf[MAX_BRANCH_PARAM_LEN];
int branch_len;
str branch_str;
struct hostport hp;
struct rte* list;
str contact, ruri, *cont;
struct socket_info* send_sock;
str next_hop;
if (rpl->first_line.u.reply.statuscode < 300 ) {
/* build e2e ack for 2xx reply -> we need the route set */
if (get_contact_uri(rpl, &contact) < 0) {
return 0;
}
if (process_routeset(rpl, &contact, &list, &ruri, &next_hop) < 0) {
return 0;
}
if ((contact.s != ruri.s) || (contact.len != ruri.len)) {
/* contact != ruri means that the next
* hop is a strict router, cont will be non-zero
* and print_routeset will append it at the end
* of the route set
*/
cont = &contact;
} else {
/* Next hop is a loose router, nothing to append */
cont = 0;
}
} else {
/* build hop-by-hop ack for negative reply ->
* ruri is the same as in INVITE; no route set */
ruri = Trans->uac[branch].uri;
cont = 0;
list = 0;
}
/* method, separators, version: "ACK sip:[email protected] SIP/2.0" */
*len = SIP_VERSION_LEN + ACK_LEN + 2 /* spaces */ + CRLF_LEN;
*len += ruri.len;
/* use same socket as for INVITE -bogdan */
send_sock = Trans->uac[branch].request.dst.send_sock;
if (!t_calc_branch(Trans, branch, branch_buf, &branch_len)) goto error;
branch_str.s = branch_buf;
branch_str.len = branch_len;
set_hostport(&hp, 0);
/* build via */
via = via_builder(&via_len, send_sock, &branch_str, 0,
send_sock->proto, &hp);
if (!via) {
LM_ERR("no via header got from builder\n");
goto error;
}
*len+= via_len;
/*headers*/
*len += Trans->from.len + Trans->callid.len + to->len +
Trans->cseq_n.len + 1 + ACK_LEN + CRLF_LEN;
/* copy'n'paste Route headers */
*len += calc_routeset_len(list, cont);
/* User Agent */
if (server_signature)
*len += user_agent_header.len + CRLF_LEN;
/* Content Length, EoM */
*len += CONTENT_LENGTH_LEN + 1 + CRLF_LEN + CRLF_LEN;
req_buf = shm_malloc(*len + 1);
if (!req_buf) {
LM_ERR("no more share memory\n");
goto error01;
}
p = req_buf;
append_string( p, ACK " ", ACK_LEN+1 );
append_string(p, ruri.s, ruri.len );
append_string( p, " " SIP_VERSION CRLF, 1 + SIP_VERSION_LEN + CRLF_LEN);
/* insert our via */
append_string(p, via, via_len);
/*other headers*/
append_string(p, Trans->from.s, Trans->from.len);
append_string(p, Trans->callid.s, Trans->callid.len);
append_string(p, to->s, to->len);
append_string(p, Trans->cseq_n.s, Trans->cseq_n.len);
*(p++) = ' ';
append_string(p, ACK CRLF, ACK_LEN+CRLF_LEN);
/* Routeset */
p = print_rs(p, list, cont);
/* User Agent header, Content Length, EoM */
if (server_signature) {
append_string(p, user_agent_header.s, user_agent_header.len);
append_string(p, CRLF CONTENT_LENGTH "0" CRLF CRLF,
CRLF_LEN+CONTENT_LENGTH_LEN + 1 + CRLF_LEN + CRLF_LEN);
} else {
append_string(p, CONTENT_LENGTH "0" CRLF CRLF,
CONTENT_LENGTH_LEN + 1 + CRLF_LEN + CRLF_LEN);
}
*p = 0;
pkg_free(via);
free_rte_list(list);
return req_buf;
error01:
pkg_free(via);
error:
free_rte_list(list);
return 0;
}
/* Build a local request based on a previous request; the only
customers of this function are local ACK and local CANCEL
*/
char *build_local(struct cell *Trans,unsigned int branch,
str *method, str *extra, struct sip_msg* rpl, unsigned int *len)
{
char *cancel_buf, *p, *via;
unsigned int via_len;
struct hdr_field *buf_hdrs;
struct hdr_field *hdr;
struct sip_msg *req;
char branch_buf[MAX_BRANCH_PARAM_LEN];
str branch_str;
struct hostport hp;
str from;
str to;
str cseq_n;
req = Trans->uas.request;
cseq_n = Trans->cseq_n;
buf_hdrs = 0;
if (rpl && rpl!=FAKED_REPLY) {
/* take from and to hdrs from reply */
to.s = rpl->to->name.s;
to.len = rpl->to->len;
from.s = rpl->from->name.s;
from.len = rpl->from->len;
} else {
to = Trans->to;
from = Trans->from;
if (req && req->msg_flags&(FL_USE_UAC_FROM|FL_USE_UAC_TO)) {
if ( extract_ftc_hdrs( Trans->uac[branch].request.buffer.s,
Trans->uac[branch].request.buffer.len,
(req->msg_flags&FL_USE_UAC_FROM)?&from:0 ,
(req->msg_flags&FL_USE_UAC_TO)?&to:0 , 0 )!=0 ) {
LM_ERR("build_local: failed to extract UAC hdrs\n");
goto error;
}
}
}
LM_DBG("using FROM=<%.*s>, TO=<%.*s>, CSEQ_N=<%.*s>\n",
from.len,from.s , to.len,to.s , cseq_n.len,cseq_n.s);
/* method, separators, version */
*len=SIP_VERSION_LEN + method->len + 2 /* spaces */ + CRLF_LEN;
*len+=Trans->uac[branch].uri.len;
/*via*/
branch_str.s=branch_buf;
if (!t_calc_branch(Trans, branch, branch_str.s, &branch_str.len ))
goto error;
set_hostport(&hp, (is_local(Trans))?0:req);
via=via_builder(&via_len, Trans->uac[branch].request.dst.send_sock,
&branch_str, 0, Trans->uac[branch].request.dst.proto, &hp );
if (!via){
LM_ERR("no via header got from builder\n");
goto error;
}
*len+= via_len;
/*headers*/
*len+=from.len+Trans->callid.len+to.len+cseq_n.len+1+method->len+CRLF_LEN;
/* copy'n'paste Route headers that were sent out */
if (!is_local(Trans) &&
( (req && req->route) || /* at least one route was received*/
(Trans->uac[branch].path_vec.len!=0)) ) /* path was forced */
{
buf_hdrs = extract_parsed_hdrs(Trans->uac[branch].request.buffer.s,
Trans->uac[branch].request.buffer.len );
if (buf_hdrs==NULL) {
LM_ERR("failed to reparse the request buffer\n");
goto error01;
}
for ( hdr=buf_hdrs ; hdr ; hdr=hdr->next )
if (hdr->type==HDR_ROUTE_T)
*len+=hdr->len;
}
/* User Agent */
if (server_signature) {
*len += user_agent_header.len + CRLF_LEN;
}
/* Content Length, MaxFwd, EoM */
*len+=LOCAL_MAXFWD_HEADER_LEN + CONTENT_LENGTH_LEN+1 + (extra?extra->len:0)
+ (Trans->extra_hdrs.s?Trans->extra_hdrs.len:0) + CRLF_LEN + CRLF_LEN;
cancel_buf=shm_malloc( *len+1 );
if (!cancel_buf)
{
LM_ERR("no more share memory\n");
goto error02;
}
p = cancel_buf;
append_string( p, method->s, method->len );
*(p++) = ' ';
append_string( p, Trans->uac[branch].uri.s, Trans->uac[branch].uri.len);
append_string( p, " " SIP_VERSION CRLF, 1+SIP_VERSION_LEN+CRLF_LEN );
/* insert our via */
append_string(p,via,via_len);
/*other headers*/
append_string( p, from.s, from.len );
append_string( p, Trans->callid.s, Trans->callid.len );
append_string( p, to.s, to.len );
append_string( p, cseq_n.s, cseq_n.len );
*(p++) = ' ';
append_string( p, method->s, method->len );
append_string( p, CRLF LOCAL_MAXFWD_HEADER,
CRLF_LEN+LOCAL_MAXFWD_HEADER_LEN );
/* add Route hdrs (if any) */
for ( hdr=buf_hdrs ; hdr ; hdr=hdr->next )
if(hdr->type==HDR_ROUTE_T) {
append_string(p, hdr->name.s, hdr->len );
}
if (extra)
append_string(p, extra->s, extra->len );
if (Trans->extra_hdrs.s)
append_string(p, Trans->extra_hdrs.s, Trans->extra_hdrs.len );
/* User Agent header, Content Length, EoM */
if (server_signature) {
append_string(p, user_agent_header.s, user_agent_header.len);
append_string(p, CRLF CONTENT_LENGTH "0" CRLF CRLF ,
CRLF_LEN+CONTENT_LENGTH_LEN+1 + CRLF_LEN + CRLF_LEN);
} else {
append_string(p, CONTENT_LENGTH "0" CRLF CRLF ,
CONTENT_LENGTH_LEN+1 + CRLF_LEN + CRLF_LEN);
}
*p=0;
pkg_free(via);
free_hdr_field_lst(buf_hdrs);
return cancel_buf;
error02:
free_hdr_field_lst(buf_hdrs);
error01:
pkg_free(via);
error:
return NULL;
}
/* atomic "new_tran" construct; it returns:
<0 on error
+1 if a request did not match a transaction
- it that was an ack, the calling function
shall forward statelessly
- otherwise it means, a new transaction was
introduced and the calling function
shall reply/relay/whatever_appropriate
0 on retransmission
*/
int t_newtran( struct sip_msg* p_msg, int full_uas )
{
int lret, my_err;
context_p ctx_backup;
/* is T still up-to-date ? */
LM_DBG("transaction on entrance=%p\n",T);
if ( T && T!=T_UNDEFINED ) {
LM_DBG("transaction already in process %p\n", T );
return E_SCRIPT;
}
T = T_UNDEFINED;
/* first of all, parse everything -- we will store in shared memory
and need to have all headers ready for generating potential replies
later; parsing later on demand is not an option since the request
will be in shmem and applying parse_headers to it would intermix
shmem with pkg_mem
*/
if (parse_headers(p_msg, HDR_EOH_F, 0 )<0) {
LM_ERR("parse_headers failed\n");
return E_BAD_REQ;
}
if ((p_msg->parsed_flag & HDR_EOH_F)!=HDR_EOH_F) {
LM_ERR("EoH not parsed\n");
return E_OUT_OF_MEM;
}
/* t_lookup_requests attempts to find the transaction;
it also calls check_transaction_quadruple -> it is
safe to assume we have from/callid/cseq/to
*/
lret = t_lookup_request( p_msg, 1 /* leave locked if not found */ );
/* on error, pass the error in the stack ... nothing is locked yet
if 0 is returned */
if (lret==0) return E_BAD_TUPEL;
/* transaction found, it's a retransmission */
if (lret>0) {
if (p_msg->REQ_METHOD==METHOD_ACK) {
t_release_transaction(T);
} else {
t_retransmit_reply(T);
}
/* hide the transaction from the upper layer */
t_unref( p_msg );
/* things are done -- return from script */
return 0;
}
/* from now on, be careful -- hash table is locked */
if (lret==-2) { /* was it an e2e ACK ? if so, trigger a callback */
if (e2eack_T->relaied_reply_branch==-2) {
/* if a ACK for a local replied transaction, release the
INVITE transaction and break the script -> simply absorb
the ACK request */
t_release_transaction(e2eack_T);
return 0;
}
LM_DBG("building branch for end2end ACK - flags=%X\n",e2eack_T->flags);
/* to ensure unigueness acros time and space, compute the ACK
* branch in the same maner as for INVITE, but put a t->branch
* value that cannot exist for that INVITE - as it is compute as
* an INVITE, it will not overlapp with other INVITEs or requests.
* But the faked value for t->branch guarantee no overalap with
* corresponding INVITE --bogdan */
if (!t_calc_branch(e2eack_T, e2eack_T->nr_of_outgoings+1,
p_msg->add_to_branch_s, &p_msg->add_to_branch_len )) {
LM_ERR("ACK branch computation failed\n");
}
return 1;
}
/* transaction not found, it's a new request (lret<0, lret!=-2);
establish a new transaction ... */
if (p_msg->REQ_METHOD==METHOD_ACK) /* ... unless it is in ACK */
return 1;
my_err=new_t(p_msg, full_uas);
if (my_err<0) {
LM_ERR("new_t failed\n");
goto new_err;
}
UNLOCK_HASH(p_msg->hash_index);
/* now, when the transaction state exists, check if
there is a meaningful Via and calculate it; better
do it now than later: state is established so that
subsequent retransmissions will be absorbed and will
not possibly block during Via DNS resolution; doing
it later would only burn more CPU as if there is an
error, we cannot relay later whatever comes out of the
the transaction
*/
if (!init_rb( &T->uas.response, p_msg)) {
LM_ERR("unresolvable via1\n");
put_on_wait( T );
t_unref(p_msg);
return E_BAD_VIA;
}
if (auto_100trying && p_msg->REQ_METHOD==METHOD_INVITE) {
ctx_backup = current_processing_ctx;
current_processing_ctx = NULL;
t_reply( T, p_msg , 100 , &relay_reason_100);
current_processing_ctx = ctx_backup;
}
return 1;
new_err:
UNLOCK_HASH(p_msg->hash_index);
return my_err;
}
static inline int pre_print_uac_request( struct cell *t, int branch,
struct sip_msg *request)
{
int backup_route_type;
struct usr_avp **backup_list;
char *p;
/* ... we calculate branch ... */
if (!t_calc_branch(t, branch, request->add_to_branch_s,
&request->add_to_branch_len ))
{
LOG(L_ERR, "ERROR:pre_print_uac_request: branch computation failed\n");
goto error;
}
/* from now on, flag all new lumps with LUMPFLAG_BRANCH flag in order to
* be able to remove them later --bogdan */
set_init_lump_flags(LUMPFLAG_BRANCH);
/********** run route & callback ************/
/* run branch route, if any; run it before RURI's DNS lookup
* to allow to be changed --bogdan */
if (t->on_branch) {
/* need to pkg_malloc the dst_uri */
if ( request->dst_uri.len ) {
if ( (p=pkg_malloc(request->dst_uri.len))==0 ) {
LOG(L_ERR,"ERROR:tm:pre_print_uac_request: no more pkg mem\n");
ser_error=E_OUT_OF_MEM;
goto error;
}
memcpy( p, request->dst_uri.s, request->dst_uri.len);
request->dst_uri.s = p;
}
/* need to pkg_malloc the new_uri */
if ( (p=pkg_malloc(request->new_uri.len))==0 ) {
LOG(L_ERR,"ERROR:tm:pre_print_uac_request: no more pkg mem\n");
ser_error=E_OUT_OF_MEM;
goto error;
}
memcpy( p, request->new_uri.s, request->new_uri.len);
request->new_uri.s = p;
/* make available the avp list from transaction */
backup_list = set_avp_list( &t->user_avps );
/* run branch route */
swap_route_type( backup_route_type, BRANCH_ROUTE);
if (run_actions(branch_rlist[t->on_branch], request)==0 &&
(action_flags&ACT_FL_DROP) ) {
DBG("DEBUG:tm:pre_print_uac_request: dropping branch <%.*s>\n",
request->dst_uri.len, request->dst_uri.s);
goto error;
}
set_route_type( backup_route_type );
/* restore original avp list */
set_avp_list( backup_list );
}
/* run the specific callbacks for this transaction */
run_trans_callbacks( TMCB_REQUEST_FWDED, t, request, 0,
-request->REQ_METHOD);
return 0;
error:
return -1;
}