- Local UAC related functions do not register the TMCB_LOCAL_COMPLETED and TMCB_LOCAL...
[sip-router] / modules / tm / uac.c
index 5bc5b47..55f86ad 100644 (file)
@@ -7,7 +7,7 @@
  * supported during client generation, in all other places
  * it is -- adding it should be simple
  *
- * Copyright (C) 2001-2003 Fhg Fokus
+ * Copyright (C) 2001-2003 FhG Fokus
  *
  * This file is part of ser, a free SIP server.
  *
  * 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)
+ *  2005-12-16  t_uac will set the new_cell timers to the default values,
+ *               fixes 0 fr_timer bug (andrei)
+ *  2006-08-11  t_uac uses dns failover until it finds a send socket (andrei)
+ *  2007-03-15  TMCB_ONSEND callbacks support added (andrei)
+ *  2007-03-23  TMCB_LOCAL_REQUEST_IN callbacks support (andrei)
+ *  2007-04-23  per dialog callbacks support (andrei)
+ *  2007-06-01  support for per transaction different retransmissions intervals
+ *              (andrei)
  */
 
-
-#include <stdlib.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <limits.h>
+#include <string.h>
+#include "../../mem/shm_mem.h"
 #include "../../dprint.h"
-#include "../../ut.h"
-#include "../../hash_func.h"
-#include "../../md5utils.h"
-#include "../../mem/mem.h"
-#include "../../fifo_server.h"
-#include "../../error.h"
-#include "../../pt.h"
+#include "../../globals.h"
+#include "../../md5.h"
 #include "../../crc.h"
-#include "t_funcs.h"
-#include "config.h"
-#include "sip_msg.h"
+#include "../../ip_addr.h"
+#include "../../socket_info.h"
+#include "../../compiler_opt.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"
+#include "t_stats.h"
 
-/* Call-ID has the following form: <callid_nr>-<pid>@<ip>
- * callid_nr is initialized as a random number and continually
- * increases; -<pid>@<ip> is kept in callid_suffix
- */
-
-#define CALLID_SUFFIX_LEN (1 /* - */ + 5 /* pid */ \
-       + 42 /* embedded v4inv6 address can be looong '128.' */ \
-       + 2 /* parenthessis [] */ + 1 /* ZT 0 */ \
-       + 16 /* one never knows ;-) */ )
-#define CALLID_NR_LEN 20
-
-/* the character which separates random from constant part */
-#define CID_SEP        '-'
 
-/* length of FROM tags */
-#define FROM_TAG_LEN (MD5_LEN +1 /* - */ + CRC16_LEN)
+#define FROM_TAG_LEN (MD5_LEN + 1 /* - */ + CRC16_LEN) /* length of FROM tags */
 
-static unsigned long callid_nr;
-static char *callid_suffix;
-static int callid_suffix_len;
-static int rand_len;   /* number of chars to display max rand */
-static char callid[CALLID_NR_LEN+CALLID_SUFFIX_LEN];
+static char from_tag[FROM_TAG_LEN + 1];
 
-char *uac_from="\"UAC Account\" <sip:uac@dev.null:9>";
+char* uac_from = "sip:foo@foo.bar"; /* Module parameter */
 
-static char from_tag[ FROM_TAG_LEN+1 ];
+/* Enable/disable passing of provisional replies to FIFO applications */
+int pass_provisional_replies = 0;
 
-
-
-int uac_init() {
-
-       int i; 
-       unsigned long uli;
-       int rand_len_bits;
-       int rand_cnt; /* number of rands() to be long enough */
-       int rand_bits; /* length of rands() in bits */
+/*
+ * Initialize UAC
+ */
+int uac_init(void) 
+{
        str src[3];
+       struct socket_info *si;
 
-       if (RAND_MAX<TABLE_ENTRIES) {
+       if (RAND_MAX < TABLE_ENTRIES) {
                LOG(L_WARN, "Warning: uac does not spread "
-                       "accross the whole hash table\n");
+                   "across the whole hash table\n");
        }
-
-       /* calculate the initial call-id */
-
-       /* how many bits and chars do we need to display the 
-        * whole ULONG number */
-       for (rand_len_bits=0,uli=ULONG_MAX;uli;
-                       uli>>=1, rand_len_bits++ );
-       rand_len=rand_len_bits/4;
-       if (rand_len>CALLID_NR_LEN) {
-               LOG(L_ERR, "ERROR: Too small callid buffer\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;
        }
 
-       /* how long are the rand()s ? */
-       for (rand_bits=0,i=RAND_MAX;i;i>>=1,rand_bits++);
-       /* how many rands() fit in the ULONG ? */
-       rand_cnt=rand_len_bits / rand_bits;
-
-       /* now fill in the callid with as many random
-        * numbers as you can + 1 */
-       callid_nr=rand(); /* this is the + 1 */
-       while(rand_cnt) {
-               rand_cnt--;
-               callid_nr<<=rand_bits;
-               callid_nr|=rand();
-       }
-       callid_suffix=callid+rand_len;
-       DBG("CALLID initialization: %lx (len=%d)\n", 
-                       callid_nr, rand_len );
-       DBG("CALLID0=%0*lx\n", rand_len, callid_nr );
-
-
        /* 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;
+}
 
-       src[0].s="Long live SER server";
-       src[0].len=strlen(src[0].s);
-       src[1].s=sock_info[bind_idx].address_str.s;
-       src[1].len=strlen(src[1].s);
-       src[2].s=sock_info[bind_idx].port_no_str.s;
-       src[2].len=strlen(src[2].s);
-
-       MDStringArray( from_tag, src, 3 );
-       from_tag[MD5_LEN]=CID_SEP;
 
-       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;
 }
 
 
-int uac_child_init( int rank ) 
+/*
+ * Check value of parameters
+ */
+static inline int check_params(uac_req_t *uac_r, str* to, str* from)
 {
-       callid_suffix_len=snprintf(callid_suffix,CALLID_SUFFIX_LEN,
-                       "%c%d@%*s", CID_SEP, my_pid(), 
-                       sock_info[bind_idx].address_str.len,
-                       sock_info[bind_idx].address_str.s );
-       if (callid_suffix_len==-1) {
-               LOG(L_ERR, "ERROR: uac_child_init: 
-                       buffer too small\n");
+       if (!uac_r || !uac_r->method || !to || !from) {
+               LOG(L_ERR, "check_params(): Invalid parameter value\n");
                return -1;
        }
-       DBG("DEBUG: callid_suffix: %s\n", callid_suffix );
-       return 1;
+
+       if (!uac_r->method->s || !uac_r->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;
 }
 
-int t_uac( str *msg_type, str *dst, 
-       str *headers, str *body, str *from, 
-       transaction_cb completion_cb, void *cbp, 
-       dlg_t dlg)
+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;
+}
+
 
-       int r;
+/* WARNING: - dst_cell contains the created cell, but it is un-referenced
+ *            (before using it make sure you REF() it first)
+ *          - if  ACK (method==ACK), a cell will be created but it will not
+ *            be added in the hash table (should be either deleted by the 
+ *            caller) 
+ */
+static inline int t_uac_prepare(uac_req_t *uac_r, 
+               struct retr_buf **dst_req,
+               struct cell **dst_cell)
+{
+       struct dest_info dst;
        struct cell *new_cell;
-       struct proxy_l *proxy;
-       int branch;
-       int ret;
-       unsigned int req_len;
-       char *buf;
-       union sockaddr_union to;
-       struct socket_info* send_sock;
        struct retr_buf *request;
-       str dummy_from;
-       str callid_s;
-       str fromtag;
-
-       /* make -Wall shut up */
-       ret=0;
-
-       proxy=uri2proxy( dst );
-       if (proxy==0) {
-               ser_error=ret=E_BAD_ADDRESS;
-               LOG(L_ERR, "ERROR: t_uac: can't create a dst proxy\n");
-               goto done;
-       }
-       branch=0;
-       /* might go away -- we ignore it in send_pr_buffer anyway */
-       /* T->uac[branch].request.to_len=sizeof(union sockaddr_union); */
-       hostent2su(&to, &proxy->host, proxy->addr_idx, 
-               (proxy->port)?htons(proxy->port):htons(SIP_PORT));
-       send_sock=get_send_socket( &to );
-       if (send_sock==0) {
-               LOG(L_ERR, "ERROR: t_uac: no corresponding listening socket "
-                       "for af %d\n", to.s.sa_family );
-               ret=E_NO_SOCKET;
-               goto error00;
+       char* buf;
+        int buf_len, ret;
+       unsigned int hi;
+       int is_ack;
+       ticks_t lifetime;
+#ifdef USE_DNS_FAILOVER
+       struct dns_srv_handle dns_h;
+#endif
+
+       ret=-1;
+       hi=0; /* make gcc happy */
+       /*if (dst_req) *dst_req = NULL;*/
+       is_ack = (((uac_r->method->len == 3) && (memcmp("ACK", uac_r->method->s, 3)==0)) ? 1 : 0);
+       
+       /*** added by dcm 
+        * - needed by external ua to send a request within a dlg
+        */
+       if (w_calculate_hooks(uac_r->dialog)<0 && !uac_r->dialog->hooks.next_hop)
+               goto error2;
+
+       if (!uac_r->dialog->loc_seq.is_set) {
+               /* this is the first request in the dialog,
+               set cseq to default value now - Miklos */
+               uac_r->dialog->loc_seq.value = DEFAULT_CSEQ;
+               uac_r->dialog->loc_seq.is_set = 1;
        }
 
-       /* update callid */
-       /* generate_callid(); */
-       callid_nr++;
-       r=snprintf(callid, rand_len+1, "%0*lx", rand_len, callid_nr );
-       if (r==-1) {
-               LOG(L_CRIT, "BUG: SORRY, callid calculation failed\n");
-               goto error00;
+       DBG("DEBUG:tm:t_uac: next_hop=<%.*s>\n",uac_r->dialog->hooks.next_hop->len,
+                       uac_r->dialog->hooks.next_hop->s);
+       /* it's a new message, so we will take the default socket */
+#ifdef USE_DNS_FAILOVER
+       if (use_dns_failover){
+               dns_srv_handle_init(&dns_h);
+               if ((uri2dst(&dns_h, &dst, 0, uac_r->dialog->hooks.next_hop, PROTO_NONE)==0)
+                               || (dst.send_sock==0)){
+                       dns_srv_handle_put(&dns_h);
+                       ser_error = E_NO_SOCKET;
+                       ret=ser_error;
+                       LOG(L_ERR, "t_uac: no socket found\n");
+                       goto error2;
+               }
+               dns_srv_handle_put(&dns_h); /* not needed anymore */
+       }else{
+               if ((uri2dst(0, &dst, 0, uac_r->dialog->hooks.next_hop, PROTO_NONE)==0) ||
+                               (dst.send_sock==0)){
+                       ser_error = E_NO_SOCKET;
+                       ret=ser_error;
+                       LOG(L_ERR, "t_uac: no socket found\n");
+                       goto error2;
+               }
+       }
+#else
+       if ((uri2dst(&dst, 0, uac_r->dialog->hooks.next_hop, PROTO_NONE)==0) ||
+                       (dst.send_sock==0)){
+               ser_error = E_NO_SOCKET;
+               ret=ser_error;
+               LOG(L_ERR, "t_uac: no socket found\n");
+               goto error2;
        }
-       /* fix the ZT 0 */
-       callid[rand_len]=CID_SEP;
-       callid_s.s=callid;
-       callid_s.len=rand_len+callid_suffix_len;
-       DBG("DEBUG: NEW CALLID:%*s\n", callid_s.len, callid_s.s );
+#endif
 
-       new_cell = build_cell( NULL ) 
+       new_cell = build_cell(0)
        if (!new_cell) {
                ret=E_OUT_OF_MEM;
-               LOG(L_ERR, "ERROR: t_uac: short of cell shmem\n");
-               goto error00;
+               LOG(L_ERR, "t_uac: short of cell shmem\n");
+               goto error2;
        }
-       new_cell->completion_cb=completion_cb;
-       new_cell->cbp=cbp;
-       /* cbp is installed -- tell error handling bellow not to free it */
-       cbp=0;
-       new_cell->is_invite=msg_type->len==INVITE_LEN 
-               && memcmp(msg_type->s, INVITE, INVITE_LEN)==0;
-       new_cell->local=1;
-       new_cell->kr=REQ_FWDED;
-
-
-       request=&new_cell->uac[branch].request;
-       request->to=to;
-       request->send_sock=send_sock;
-
-       /* need to put in table to calculate label which is needed for printing */
-       LOCK_HASH(new_cell->hash_index);
-       insert_into_hash_table_unsafe(  new_cell );
-       UNLOCK_HASH(new_cell->hash_index);
-
-       if (from) dummy_from=*from; else { dummy_from.s=0; dummy_from.len=0; }
-       /* calculate from tag from callid */
-       crcitt_string_array(&from_tag[MD5_LEN+1], &callid_s, 1 );
-       fromtag.s=from_tag; fromtag.len=FROM_TAG_LEN;
-       buf=build_uac_request(  *msg_type, *dst, 
-                       dummy_from, fromtag,
-                       DEFAULT_CSEQ, callid_s, 
-                       *headers, *body, branch,
-                       new_cell, /* t carries hash_index, label, md5,
-                               uac[].send_sock and other pieces of
-                               information needed to print a message*/
-               &req_len );
+       if (uac_r->method->len==INVITE_LEN && memcmp(uac_r->method->s, INVITE, INVITE_LEN)==0){
+               new_cell->flags |= T_IS_INVITE_FLAG;
+               new_cell->flags|=T_AUTO_INV_100 & (!tm_auto_inv_100 -1);
+               lifetime=tm_max_inv_lifetime;
+       }else
+               lifetime=tm_max_noninv_lifetime;
+       new_cell->flags |= T_IS_LOCAL_FLAG;
+       /* init timers hack, new_cell->fr_timer and new_cell->fr_inv_timer
+        * must be set, or else the fr will happen immediately
+        * we can't call init_new_t() because we don't have a sip msg
+        * => we'll ignore t_set_fr() or avp timer value and will use directly the
+        * module params fr_inv_timer and fr_timer -- andrei */
+       new_cell->fr_timeout=fr_timeout;
+       new_cell->fr_inv_timeout=fr_inv_timeout;
+       new_cell->end_of_life=get_ticks_raw()+lifetime;
+#ifdef TM_DIFF_RT_TIMEOUT
+       /* same as above for retransmission intervals */
+       new_cell->rt_t1_timeout=rt_t1_timeout;
+       new_cell->rt_t2_timeout=rt_t2_timeout;
+#endif
+
+       /* better reset avp list now - anyhow, it's useless from
+        * this point (bogdan) */
+       reset_avps();
+
+       set_kr(REQ_FWDED);
+
+       request = &new_cell->uac[0].request;
+       
+       request->dst = dst;
+
+       if (!is_ack) {
+#ifdef TM_DEL_UNREF
+               INIT_REF(new_cell, 1); /* ref'ed only from the hash */
+#endif
+               hi=dlg2hash(uac_r->dialog);
+               LOCK_HASH(hi);
+               insert_into_hash_table_unsafe(new_cell, hi);
+               UNLOCK_HASH(hi);
+       }
+
+       buf = build_uac_req(uac_r->method, uac_r->headers, uac_r->body, uac_r->dialog, 0, new_cell,
+               &buf_len, &dst);
        if (!buf) {
+               LOG(L_ERR, "t_uac: Error while building message\n");
                ret=E_OUT_OF_MEM;
-               LOG(L_ERR, "ERROR: t_uac: short of req shmem\n");
-               goto error01;
-       }      
-       new_cell->method.s=buf;new_cell->method.len=msg_type->len;
+               goto error1;
+       }
 
+       new_cell->method.s = buf;
+       new_cell->method.len = uac_r->method->len;
 
        request->buffer = buf;
-       request->buffer_len = req_len;
+       request->buffer_len = buf_len;
        new_cell->nr_of_outgoings++;
 
-
-       proxy->tx++;
-       proxy->tx_bytes+=req_len;
-
-       if (SEND_BUFFER( request)==-1) {
-               LOG(L_ERR, "ERROR: t_uac: UAC sending to %.*s failed\n",
-                       dst->len, dst->s );
-               proxy->errors++;
-               proxy->ok=0;
+       /* Register the callbacks after everything is successful and nothing can fail.
+       Otherwise the callback parameter would be freed twise, once from TMCB_DESTROY,
+       and again because of the negative return code. */
+       if(uac_r->cb && insert_tmcb(&(new_cell->tmcb_hl), uac_r->cb_flags, *(uac_r->cb), uac_r->cbp)!=1){
+               ret=E_OUT_OF_MEM; 
+               LOG(L_ERR, "t_uac: short of tmcb shmem\n");
+               goto error1;
        }
-       start_retr( request );
-
-       /* success */
+       if (has_local_reqin_tmcbs())
+                       run_local_reqin_callbacks(new_cell, 0, 0);
+#ifdef DIALOG_CALLBACKS
+       run_trans_dlg_callbacks(uac_r->dialog, new_cell, request);
+#endif /* DIALOG_CALLBACKS */
+       if (dst_req) *dst_req = request;
+       if (dst_cell) *dst_cell = new_cell;
+       else if(is_ack && dst_req==0){
+               free_cell(new_cell);
+       }
+       
        return 1;
 
-error01:
-       LOCK_HASH(new_cell->hash_index);
-       remove_from_hash_table_unsafe( new_cell );
-       UNLOCK_HASH(new_cell->hash_index);
-       free_cell(new_cell);
-error00:
-       free_proxy( proxy );
-       free( proxy );
-done: 
-       /* if we did not install cbp, release it now */
-       if (cbp) shm_free(cbp);
-       return ser_error=ret;
+ error1:
+       if (!is_ack) {
+               LOCK_HASH(hi);
+               remove_from_hash_table_unsafe(new_cell);
+               UNLOCK_HASH(hi);
+#ifdef TM_DEL_UNREF
+               UNREF_FREE(new_cell);
+       }else
+#else
+       }
+#endif
+               free_cell(new_cell);
+error2:
+       return ret;
 }
 
-static void fifo_callback( struct cell *t, struct sip_msg *msg,
-       int code, void *param)
+/*
+ * Prepare a message within a dialog
+ */
+int prepare_req_within(uac_req_t *uac_r,
+               struct retr_buf **dst_req)
 {
+       if (!uac_r || !uac_r->method || !uac_r->dialog) {
+               LOG(L_ERR, "req_within: Invalid parameter value\n");
+               goto err;
+       }
 
-       char *filename;
-       str text;
-
-       DBG("DEBUG: fifo UAC completed with status %d\n", code);
-       if (!t->cbp) {
-               LOG(L_INFO, "INFO: fifo UAC completed with status %d\n", code);
-               return;
+       if (uac_r->dialog->state != DLG_CONFIRMED) {
+               LOG(L_ERR, "req_within: Dialog is not confirmed yet\n");
+               goto err;
        }
 
-       filename=(char *)(t->cbp);
-       get_reply_status(&text,msg,code);
-       if (text.s==0) {
-               LOG(L_ERR, "ERROR: fifo_callback: get_reply_status failed\n");
-               fifo_reply(filename, "500 fifo_callback: get_reply_status failed\n");
-               return;
+       if ((uac_r->method->len == 3) && (!memcmp("ACK", uac_r->method->s, 3))) goto send;
+       if ((uac_r->method->len == 6) && (!memcmp("CANCEL", uac_r->method->s, 6))) goto send;
+       uac_r->dialog->loc_seq.value++; /* Increment CSeq */
+ send:
+       return t_uac_prepare(uac_r, dst_req, 0);
+
+ err:
+       /* if (cbp) shm_free(cbp); */
+       /* !! never free cbp here because if t_uac_prepare fails, cbp is not freed
+        * and thus caller has no chance to discover if it is freed or not !! */
+       return -1;
+}
+
+static inline void send_prepared_request_impl(struct retr_buf *request, int retransmit)
+{
+       if (SEND_BUFFER(request) == -1) {
+               LOG(L_ERR, "t_uac: Attempt to send to precreated request failed\n");
        }
-       fifo_reply(filename, "%.*s", text.len, text.s );
-       pkg_free(text.s);
-       DBG("DEBUG: fifo_callback sucesssfuly completed\n");
-}      
+#ifdef TMCB_ONSEND
+       else if (unlikely(has_tran_tmcbs(request->my_T, TMCB_REQUEST_SENT)))
+               /* we don't know the method here */
+                       run_onsend_callbacks(TMCB_REQUEST_SENT, request, 0, 0,
+                                                                       TMCB_LOCAL_F);
+#endif
+       
+       if (retransmit && (start_retr(request)!=0))
+               LOG(L_CRIT, "BUG: t_uac: failed to start retr. for %p\n", request);
+}
+
+void send_prepared_request(struct retr_buf *request)
+{
+       send_prepared_request_impl(request, 1 /* retransmit */);
+}
 
-/* to be obsoleted in favor of fifo_uac_from */
-int fifo_uac( FILE *stream, char *response_file ) 
+/*
+ * Send a request using data from the dialog structure
+ */
+int t_uac(uac_req_t *uac_r)
 {
-       char method[MAX_METHOD];
-       char header[MAX_HEADER];
-       char body[MAX_BODY];
-       char dst[MAX_DST];
-       str sm, sh, sb, sd;
-       char *shmem_file;
-       int fn_len;
+       struct retr_buf *request;
+       struct cell *cell;
        int ret;
-       int sip_error;
-       char err_buf[MAX_REASON_LEN];
-
-       sm.s=method; sh.s=header; sb.s=body; sd.s=dst;
-       if (!read_line(method, MAX_METHOD, stream,&sm.len)||sm.len==0) {
-               /* line breaking must have failed -- consume the rest
-                  and proceed to a new request
-               */
-               LOG(L_ERR, "ERROR: fifo_uac: method expected\n");
-               fifo_reply(response_file, 
-                       "400 fifo_uac: method expected");
-               return 1;
-       }
-       DBG("DEBUG: fifo_uac: method: %.*s\n", sm.len, method );
-       if (!read_line(dst, MAX_DST, stream, &sd.len)||sd.len==0) {
-               fifo_reply(response_file, 
-                       "400 fifo_uac: destination expected\n");
-               LOG(L_ERR, "ERROR: fifo_uac: destination expected\n");
-               return 1;
-       }
-       DBG("DEBUG: fifo_uac:  dst: %.*s\n", sd.len, dst );
-       /* now read header fields line by line */
-       if (!read_line_set(header, MAX_HEADER, stream, &sh.len)) {
-               fifo_reply(response_file, 
-                       "400 fifo_uac: HFs expected\n");
-               LOG(L_ERR, "ERROR: fifo_uac: header fields expected\n");
-               return 1;
-       }
-       DBG("DEBUG: fifo_uac: header: %.*s\n", sh.len, header );
-       /* and eventually body */
-       if (!read_body(body, MAX_BODY, stream, &sb.len)) {
-               fifo_reply(response_file, 
-                       "400 fifo_uac: body expected\n");
-               LOG(L_ERR, "ERROR: fifo_uac: body expected\n");
-               return 1;
-       }
-       DBG("DEBUG: fifo_uac: body: %.*s\n", sb.len, body );
-       DBG("DEBUG: fifo_uac: EoL -- proceeding to transaction creation\n");
-       /* we got it all, initiate transaction now! */
-       if (response_file) {
-               fn_len=strlen(response_file)+1;
-               shmem_file=shm_malloc(fn_len);
-               if (shmem_file==0) {
-                       LOG(L_ERR, "ERROR: fifo_uac: no shmem\n");
-                       fifo_reply(response_file, 
-                               "500 fifo_uac: no shmem for shmem_file\n");
-                       return 1;
-               }
-               memcpy(shmem_file, response_file, fn_len );
+       int is_ack;
+
+       ret = t_uac_prepare(uac_r, &request, &cell);
+       if (ret < 0) return ret;
+       is_ack = (uac_r->method->len == 3) && (memcmp("ACK", uac_r->method->s, 3)==0) ? 1 : 0;
+       send_prepared_request_impl(request, !is_ack /* retransmit */);
+       if (cell && is_ack)
+               free_cell(cell);
+       return ret;
+}
+
+/*
+ * Send a request using data from the dialog structure
+ * ret_index and ret_label will identify the new cell
+ */
+int t_uac_with_ids(uac_req_t *uac_r,
+       unsigned int *ret_index, unsigned int *ret_label)
+{
+       struct retr_buf *request;
+       struct cell *cell;
+       int ret;
+       int is_ack;
+
+       ret = t_uac_prepare(uac_r, &request, &cell);
+       if (ret < 0) return ret;
+       is_ack = (uac_r->method->len == 3) && (memcmp("ACK", uac_r->method->s, 3)==0) ? 1 : 0;
+       send_prepared_request_impl(request, !is_ack /* retransmit */);
+       if (is_ack) {
+               if (cell) free_cell(cell);
+               if (ret_index && ret_label)
+                       *ret_index = *ret_label = 0;
        } else {
-               shmem_file=0;
-       }
-       ret=t_uac(&sm,&sd,&sh,&sb, 0 /* default from */,
-               fifo_callback,shmem_file,0 /* no dialog */);
-       if (ret>0) {
-               if (err2reason_phrase(ret, &sip_error, err_buf,
-                               sizeof(err_buf), "FIFO/UAC" ) > 0 ) 
-               {
-                       fifo_reply(response_file, "500 FIFO/UAC error: %d\n",
-                               ret );
-               } else {
-                       fifo_reply(response_file, err_buf );
+               if (ret_index && ret_label) {
+                       *ret_index = cell->hash_index;
+                       *ret_label = cell->label;
                }
        }
-       return 1;
+       return ret;
 }
 
-/* syntax:
+/*
+ * Send a message within a dialog
+ */
+int req_within(uac_req_t *uac_r)
+{
+       if (!uac_r || !uac_r->method || !uac_r->dialog) {
+               LOG(L_ERR, "req_within: Invalid parameter value\n");
+               goto err;
+       }
 
-       :t_uac_from:[file] EOL
-       method EOL
-       [from] EOL (if none, server's default from is taken)
-       dst EOL (put in r-uri and To)
-       [CR-LF separated HFs]* EOL
-       EOL
-       [body] EOL
-       EOL
+       if ((uac_r->method->len == 3) && (!memcmp("ACK", uac_r->method->s, 3))) goto send;
+       if ((uac_r->method->len == 6) && (!memcmp("CANCEL", uac_r->method->s, 6))) goto send;
+       uac_r->dialog->loc_seq.value++; /* Increment CSeq */
+ send:
+       return t_uac(uac_r);
+
+ err:
+       /* callback parameter must be freed outside of tm module
+       if (cbp) shm_free(cbp); */
+       return -1;
+}
 
-*/
 
-int fifo_uac_from( FILE *stream, char *response_file ) 
+/*
+ * Send an initial request that will start a dialog
+ * WARNING: writes uac_r->dialog
+ */
+int req_outside(uac_req_t *uac_r, str* to, str* from)
 {
-       char method[MAX_METHOD];
-       char header[MAX_HEADER];
-       char body[MAX_BODY];
-       char dst[MAX_DST];
-       char from[MAX_FROM];
-       str sm, sh, sb, sd, sf;
-       char *shmem_file;
-       int fn_len;
-       int ret;
-       int sip_error;
-       char err_buf[MAX_REASON_LEN];
-       int err_ret;
-
-       sm.s=method; sh.s=header; sb.s=body; sd.s=dst;sf.s=from;
-
-       if (!read_line(method, MAX_METHOD, stream,&sm.len)||sm.len==0) {
-               /* line breaking must have failed -- consume the rest
-                  and proceed to a new request
-               */
-               LOG(L_ERR, "ERROR: fifo_uac: method expected\n");
-               fifo_reply(response_file, 
-                       "400 fifo_uac: method expected");
-               return 1;
-       }
-       DBG("DEBUG: fifo_uac: method: %.*s\n", sm.len, method );
-       if (!read_line(from, MAX_FROM, stream, &sf.len)) {
-               fifo_reply(response_file, 
-                       "400 fifo_uac: from expected\n");
-               LOG(L_ERR, "ERROR: fifo_uac: from expected\n");
-               return 1;
-       }
-       DBG("DEBUG: fifo_uac:  from: %.*s\n", sf.len, from);
-       if (!read_line(dst, MAX_DST, stream, &sd.len)||sd.len==0) {
-               fifo_reply(response_file, 
-                       "400 fifo_uac: destination expected\n");
-               LOG(L_ERR, "ERROR: fifo_uac: destination expected\n");
-               return 1;
-       }
-       DBG("DEBUG: fifo_uac:  dst: %.*s\n", sd.len, dst );
-       /* now read header fields line by line */
-       if (!read_line_set(header, MAX_HEADER, stream, &sh.len)) {
-               fifo_reply(response_file, 
-                       "400 fifo_uac: HFs expected\n");
-               LOG(L_ERR, "ERROR: fifo_uac: header fields expected\n");
-               return 1;
-       }
-       DBG("DEBUG: fifo_uac: header: %.*s\n", sh.len, header );
-       /* and eventually body */
-       if (!read_body(body, MAX_BODY, stream, &sb.len)) {
-               fifo_reply(response_file, 
-                       "400 fifo_uac: body expected\n");
-               LOG(L_ERR, "ERROR: fifo_uac: body expected\n");
-               return 1;
+       str callid, fromtag;
+
+       if (check_params(uac_r, to, from) < 0) goto err;
+       
+       generate_callid(&callid);
+       generate_fromtag(&fromtag, &callid);
+
+       if (new_dlg_uac(&callid, &fromtag, DEFAULT_CSEQ, from, to, &uac_r->dialog) < 0) {
+               LOG(L_ERR, "req_outside(): Error while creating new dialog\n");
+               goto err;
        }
-       DBG("DEBUG: fifo_uac: body: %.*s\n", sb.len, body );
-       DBG("DEBUG: fifo_uac: EoL -- proceeding to transaction creation\n");
-       /* we got it all, initiate transaction now! */
-       if (response_file) {
-               fn_len=strlen(response_file)+1;
-               shmem_file=shm_malloc(fn_len);
-               if (shmem_file==0) {
-                       LOG(L_ERR, "ERROR: fifo_uac: no shmem\n");
-                       fifo_reply(response_file, 
-                               "500 fifo_uac: no memory for shmem_file\n");
-                       return 1;
-               }
-               memcpy(shmem_file, response_file, fn_len );
-       } else {
-               shmem_file=0;
+
+       return t_uac(uac_r);
+
+ err:
+       /* callback parameter must be freed outside of tm module
+       if (cbp) shm_free(cbp); */
+       return -1;
+}
+
+
+/*
+ * Send a transactional request, no dialogs involved
+ * WARNING: writes uac_r->dialog
+ */
+int request(uac_req_t *uac_r, str* ruri, str* to, str* from, str *next_hop)
+{
+       str callid, fromtag;
+       dlg_t* dialog;
+       int res;
+
+       if (check_params(uac_r, to, from) < 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;
        }
-       /* HACK: there is yet a shortcoming -- if t_uac fails, callback
-          will not be triggered and no feedback will be printed
-          to shmem_file
-       */
-       ret=t_uac(&sm,&sd,&sh,&sb, sf.len==0 ? 0 : &sf /* default from */,
-               fifo_callback,shmem_file,0 /* no dialog */);
-       if (ret<=0) {
-               err_ret=err2reason_phrase(ret, &sip_error, err_buf,
-                               sizeof(err_buf), "FIFO/UAC" ) ;
-               if (err_ret > 0 )
-               {
-                       fifo_reply(response_file, "%d %s", sip_error, err_buf );
-               } else {
-                       fifo_reply(response_file, "500 FIFO/UAC error: %d\n",
-                               ret );
-               }
+
+       if (ruri) {
+               dialog->rem_target.s = ruri->s;
+               dialog->rem_target.len = ruri->len;
+               /* hooks will be set from w_calculate_hooks */
        }
-       return 1;
 
+       if (next_hop) dialog->dst_uri = *next_hop;
+       w_calculate_hooks(dialog);
+
+       /* WARNING:
+        * to be clean it should be called 
+        *   set_dlg_target(dialog, ruri, next_hop);
+        * which sets both uris if given [but it duplicates them in shm!]
+        *
+        * but in this case the _ruri parameter in set_dlg_target
+        * must be optional (it is needed now) and following hacks
+        *   dialog->rem_target.s = 0;
+        *   dialog->dst_uri.s = 0;
+        * before freeing dialog here must be removed
+        */
+       uac_r->dialog = dialog;
+       res = t_uac(uac_r);
+       dialog->rem_target.s = 0;
+       dialog->dst_uri.s = 0;
+       free_dlg(dialog);
+       uac_r->dialog = 0;
+       return res;
+
+ err:
+       /* callback parameter must be freed outside of tm module
+       if (cp) shm_free(cp); */
+       return -1;
 }