int create_via(struct sip_msg* msg, char* s1, char* s2)
{
char* via;
unsigned int via_len;
str ip, port;
struct hostport hp;
struct dest_info dst;
ip.s = ip_addr2a(&msg->rcv.src_ip);
ip.len = strlen(ip.s);
port.s = int2str(msg->rcv.src_port, &port.len);
hp.host = &ip;
hp.port = &port;
init_dst_from_rcv(&dst, &msg->rcv);
via = via_builder(&via_len, &dst, 0, 0, &hp);
if (!via) {
ERR("Unable to build Via header field\n");
return -1;
}
if (insert_fake_via(msg, via, via_len) < 0) {
pkg_free(via);
return -1;
}
if (insert_via_lump(msg, via, via_len - CRLF_LEN) < 0) {
pkg_free(via);
return -1;
}
return 1;
}
/*
* 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;
}
static char* xhttp_to_sip(sip_msg_t* msg, int* new_msg_len)
{
unsigned int len, via_len;
char* via, *new_msg, *p;
str ip, port;
struct hostport hp;
struct dest_info dst;
ip.s = ip_addr2a(&msg->rcv.src_ip);
ip.len = strlen(ip.s);
port.s = int2str(msg->rcv.src_port, &port.len);
hp.host = &ip;
hp.port = &port;
init_dst_from_rcv(&dst, &msg->rcv);
via = via_builder(&via_len, &dst, 0, 0, &hp);
if (via == 0)
{
LM_DBG("failed to build via\n");
return 0;
}
len = via_len + msg->len;
p = new_msg = pkg_malloc(len + 1);
if (new_msg == 0)
{
LM_DBG("memory allocation failure (%d bytes)\n", len);
pkg_free(via);
return 0;
}
/* new message:
* <orig first line>
* Via: <faked via>
* <orig http message w/o the first line>
*/
memcpy(p, msg->first_line.u.request.method.s,
msg->first_line.len);
p += msg->first_line.len;
memcpy(p, via, via_len);
p += via_len;
memcpy(p, SIP_MSG_START(msg) + msg->first_line.len,
msg->len - msg->first_line.len);
new_msg[len] = 0;
pkg_free(via);
*new_msg_len = len;
return new_msg;
}
/* 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;
}
/*
* 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;
}
char *build_uac_cancel(str *headers,str *body,struct cell *cancelledT,
unsigned int branch, unsigned int *len)
{
char *cancel_buf, *p, *via;
unsigned int via_len;
char branch_buf[MAX_BRANCH_PARAM_LEN];
str branch_str;
struct hostport hp;
str content_length;
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);
via=via_builder(&via_len, cancelledT->uac[branch].request.dst.send_sock,
&branch_str, 0, cancelledT->uac[branch].request.dst.proto, &hp );
if (!via){
LM_ERR("no via header got from builder\n");
goto error;
}
/* 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;
append_string( p, CANCEL, CANCEL_LEN );
*(p++) = ' ';
append_string( p, cancelledT->uac[branch].uri.s,
cancelledT->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, cancelledT->from.s, cancelledT->from.len );
append_string( p, cancelledT->callid.s, cancelledT->callid.len );
append_string( p, cancelledT->to.s, cancelledT->to.len );
append_string( p, cancelledT->cseq_n.s, cancelledT->cseq_n.len );
*(p++) = ' ';
append_string( p, CANCEL, CANCEL_LEN );
append_string( p, CRLF, CRLF_LEN );
/* User Agent header */
if (server_signature) {
append_string(p,USER_AGENT CRLF, USER_AGENT_LEN+CRLF_LEN );
}
/* Content Length*/
if (body) {
append_string(p, CONTENT_LENGTH, CONTENT_LENGTH_LEN);
append_string(p, content_length.s, content_length.len);
append_string(p, CRLF, CRLF_LEN);
}
if(headers && headers->len){
append_string(p,headers->s,headers->len);
}
/*EoM*/
append_string(p,CRLF,CRLF_LEN);
if(body && body->len){
append_string(p,body->s,body->len);
}
*p=0;
pkg_free(via);
return cancel_buf;
error01:
pkg_free(via);
error:
return NULL;
}
/*
* 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;
}
