/*
* $Id: uac.c,v 1.52 2004/11/09 15:15:12 andrei Exp $
*
* simple UAC for things such as SUBSCRIBE or SMS gateway;
* no authentication and other UAC features -- just send
* a message, retransmit and await a reply; forking is not
* supported during client generation, in all other places
* it is -- adding it should be simple
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of ser, a free SIP server.
*
* ser is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* For a license to use the ser software under conditions
* other than those described here, or to purchase support for this
* software, please contact iptel.org by e-mail at the following addresses:
* info@iptel.org
*
* ser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* History:
* --------
* 2003-01-23 t_uac_dlg now uses get_out_socket (jiri)
* 2003-01-27 fifo:t_uac_dlg completed (jiri)
* 2003-01-29 scratchpad removed (jiri)
* 2003-02-13 t_uac, t _uac_dlg, gethfblock, uri2proxy changed to use
* proto & rb->dst (andrei)
* 2003-02-27 FIFO/UAC now dumps reply -- good for CTD (jiri)
* 2003-02-28 scratchpad compatibility abandoned (jiri)
* 2003-03-01 kr set through a function now (jiri)
* 2003-03-19 replaced all mallocs/frees w/ pkg_malloc/pkg_free (andrei)
* 2003-04-02 port_no_str does not contain a leading ':' anymore (andrei)
* 2003-07-08 appropriate log messages in check_params(...),
* call calculate_hooks if next_hop==NULL in t_uac (dcm)
* 2003-10-24 updated to the new socket_info lists (andrei)
* 2003-12-03 completion filed removed from transaction and uac callbacks
* merged in transaction callbacks as LOCAL_COMPLETED (bogdan)
* 2004-02-11 FIFO/CANCEL + alignments (hash=f(callid,cseq)) (uli+jiri)
* 2004-02-13 t->is_invite, t->local, t->noisy_ctimer replaced (bogdan)
* 2004-08-23 avp support in t_uac (bogdan)
*/
#include <string.h>
#include "../../mem/shm_mem.h"
#include "../../dprint.h"
#include "../../globals.h"
#include "../../md5.h"
#include "../../crc.h"
#include "../../ip_addr.h"
#include "../../socket_info.h"
#include "ut.h"
#include "h_table.h"
#include "t_hooks.h"
#include "t_funcs.h"
#include "t_msgbuilder.h"
#include "callid.h"
#include "uac.h"
#define FROM_TAG_LEN (MD5_LEN + 1 /* - */ + CRC16_LEN) /* length of FROM tags */
static char from_tag[FROM_TAG_LEN + 1];
char* uac_from = "sip:foo@foo.bar"; /* Module parameter */
/*
* Initialize UAC
*/
int uac_init(void)
{
str src[3];
struct socket_info *si;
if (RAND_MAX < TABLE_ENTRIES) {
LOG(L_WARN, "Warning: uac does not spread "
"across the whole hash table\n");
}
/* on tcp/tls bind_address is 0 so try to get the first address we listen
* on no matter the protocol */
si=bind_address?bind_address:get_first_socket();
if (si==0){
LOG(L_CRIT, "BUG: uac_init: null socket list\n");
return -1;
}
/* calculate the initial From tag */
src[0].s = "Long live SER server";
src[0].len = strlen(src[0].s);
src[1].s = si->address_str.s;
src[1].len = strlen(src[1].s);
src[2].s = si->port_no_str.s;
src[2].len = strlen(src[2].s);
MDStringArray(from_tag, src, 3);
from_tag[MD5_LEN] = '-';
return 1;
}
/*
* Generate a From tag
*/
void generate_fromtag(str* tag, str* callid)
{
/* calculate from tag from callid */
crcitt_string_array(&from_tag[MD5_LEN + 1], callid, 1);
tag->s = from_tag;
tag->len = FROM_TAG_LEN;
}
/*
* Check value of parameters
*/
static inline int check_params(str* method, str* to, str* from, dlg_t** dialog)
{
if (!method || !to || !from || !dialog) {
LOG(L_ERR, "check_params(): Invalid parameter value\n");
return -1;
}
if (!method->s || !method->len) {
LOG(L_ERR, "check_params(): Invalid request method\n");
return -2;
}
if (!to->s || !to->len) {
LOG(L_ERR, "check_params(): Invalid To URI\n");
return -4;
}
if (!from->s || !from->len) {
LOG(L_ERR, "check_params(): Invalid From URI\n");
return -5;
}
return 0;
}
static inline unsigned int dlg2hash( dlg_t* dlg )
{
str cseq_nr;
unsigned int hashid;
cseq_nr.s=int2str(dlg->loc_seq.value, &cseq_nr.len);
hashid=hash(dlg->id.call_id, cseq_nr);
DBG("DEBUG: dlg2hash: %d\n", hashid);
return hashid;
}
/*
* 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)
{
struct socket_info* send_sock;
union sockaddr_union to_su;
struct cell *new_cell;
struct retr_buf *request;
char* buf;
int buf_len;
int ret;
unsigned int hi;
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 error2;
DBG("DEBUG:tm:t_uac: next_hop=<%.*s>\n",dialog->hooks.next_hop->len,
dialog->hooks.next_hop->s);
/* it's a new message, so we will take the default socket */
send_sock = uri2sock(0, dialog->hooks.next_hop, &to_su, PROTO_NONE);
if (!send_sock) {
ret=ser_error;
LOG(L_ERR, "t_uac: no socket found\n");
goto error2;
}
new_cell = build_cell(0);
if (!new_cell) {
ret=E_OUT_OF_MEM;
LOG(L_ERR, "t_uac: short of cell shmem\n");
goto error2;
}
/* better reset avp list now - anyhow, it's useless from
* this point (bogdan) */
reset_avps();
/* add the callback the the transaction for LOCAL_COMPLETED event */
if(cb && insert_tmcb(&(new_cell->tmcb_hl),TMCB_LOCAL_COMPLETED,cb,cbp)!=1){
ret=E_OUT_OF_MEM;
LOG(L_ERR, "t_uac: 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;
set_kr(REQ_FWDED);
request = &new_cell->uac[0].request;
request->dst.to = to_su;
request->dst.send_sock = send_sock;
request->dst.proto = 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);
buf = build_uac_req(method, headers, body, dialog, 0, new_cell,
&buf_len, send_sock);
if (!buf) {
LOG(L_ERR, "t_uac: Error while building message\n");
ret=E_OUT_OF_MEM;
goto error1;
}
new_cell->method.s = buf;
new_cell->method.len = method->len;
request->buffer = buf;
request->buffer_len = buf_len;
new_cell->nr_of_outgoings++;
if (SEND_BUFFER(request) == -1) {
LOG(L_ERR, "t_uac: Attempt to send to '%.*s' failed\n",
dialog->hooks.next_hop->len,
dialog->hooks.next_hop->s);
}
start_retr(request);
return 1;
error1:
LOCK_HASH(hi);
remove_from_hash_table_unsafe(new_cell);
UNLOCK_HASH(hi);
free_cell(new_cell);
error2:
return ret;
}
/*
* Send a message within a dialog
*/
int req_within(str* method, str* headers, str* body, dlg_t* dialog, transaction_cb completion_cb, void* cbp)
{
if (!method || !dialog) {
LOG(L_ERR, "req_within: Invalid parameter value\n");
goto err;
}
if (dialog->state != DLG_CONFIRMED) {
LOG(L_ERR, "req_within: Dialog is not confirmed yet\n");
goto err;
}
if ((method->len == 3) && (!memcmp("ACK", method->s, 3))) goto send;
if ((method->len == 6) && (!memcmp("CANCEL", method->s, 6))) goto send;
dialog->loc_seq.value++; /* Increment CSeq */
send:
return t_uac(method, headers, body, dialog, completion_cb, cbp);
err:
if (cbp) shm_free(cbp);
return -1;
}
/*
* Send an initial request that will start a dialog
*/
int req_outside(str* method, str* to, str* from, str* headers, str* body, dlg_t** dialog, transaction_cb cb, void* cbp)
{
str callid, fromtag;
if (check_params(method, to, from, dialog) < 0) goto err;
generate_callid(&callid);
generate_fromtag(&fromtag, &callid);
if (new_dlg_uac(&callid, &fromtag, DEFAULT_CSEQ, from, to, dialog) < 0) {
LOG(L_ERR, "req_outside(): Error while creating new dialog\n");
goto err;
}
return t_uac(method, headers, body, *dialog, cb, cbp);
err:
if (cbp) shm_free(cbp);
return -1;
}
/*
* Send a transactional request, no dialogs involved
*/
int request(str* m, str* ruri, str* to, str* from, str* h, str* b, transaction_cb c, void* cp)
{
str callid, fromtag;
dlg_t* dialog;
int res;
if (check_params(m, to, from, &dialog) < 0) goto err;
generate_callid(&callid);
generate_fromtag(&fromtag, &callid);
if (new_dlg_uac(&callid, &fromtag, DEFAULT_CSEQ, from, to, &dialog) < 0) {
LOG(L_ERR, "request(): Error while creating temporary dialog\n");
goto err;
}
if (ruri) {
dialog->rem_target.s = ruri->s;
dialog->rem_target.len = ruri->len;
dialog->hooks.request_uri = &dialog->rem_target;
}
w_calculate_hooks(dialog);
res = t_uac(m, h, b, dialog, c, cp);
dialog->rem_target.s = 0;
free_dlg(dialog);
return res;
err:
if (cp) shm_free(cp);
return -1;
}
syntax highlighted by Code2HTML, v. 0.9.1