/*
* $Id: uac_fifo.c,v 1.12 2004/11/09 15:15:12 andrei Exp $
*
* 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:
* --------
* 2003-12-03 : fifo_callback() updated for changes in tm callbacks (bogdan)
* 2004-02-11: fix: TM callback writes to fifo changed to non-blocking (jiri)
*/
#include <string.h>
#include "../../mem/shm_mem.h"
#include "../../mem/mem.h"
#include "../../dprint.h"
#include "../../fifo_server.h"
#include "../../str.h"
#include "../../parser/msg_parser.h"
#include "../../parser/parse_from.h"
#include "../../parser/parse_uri.h"
#include "../../ip_addr.h"
#include "config.h"
#include "ut.h"
#include "uac.h"
#include "dlg.h"
#include "callid.h"
#include "h_table.h"
#include "uac_fifo.h"
/*
* Callback data structure
*/
struct cb_data {
dlg_t* dialog;
char filename[1];
};
struct str_list {
str s;
struct str_list *next;
};
#define skip_hf(_hf) ( \
((_hf)->type == HDR_FROM) || \
((_hf)->type == HDR_TO) || \
((_hf)->type == HDR_CALLID) || \
((_hf)->type == HDR_CSEQ) \
)
/*
* Report an error to syslog and FIFO output file
*/
static inline void fifo_uac_error(char *reply_fifo, int code, char *msg)
{
LOG(L_ERR, "ERROR: fifo_uac_error: %s\n", msg );
fifo_reply(reply_fifo, "%d fifo_uac_error: %s", code, msg);
}
/*
* Get the Request URI from the FIFO stream and parse it
*/
static inline int fifo_get_ruri(FILE* stream, char* response_file, str* ruri, struct sip_uri* puri)
{
static char ruri_buf[MAX_URI_SIZE];
if (!read_line(ruri_buf, MAX_URI_SIZE, stream, &ruri->len) || !ruri->len) {
fifo_uac_error(response_file, 400, "ruri expected");
return -1;
}
if (parse_uri(ruri_buf, ruri->len, puri) < 0 ) {
fifo_uac_error(response_file, 400, "ruri invalid\n");
return -2;
}
ruri->s = ruri_buf;
DBG("DEBUG: fifo_get_ruri: '%.*s'\n", ruri->len, ruri->s);
return 0;
}
/*
* Get and parse next hop URI
*/
static inline int fifo_get_nexthop(FILE* stream, char* response_file, str* nexthop, struct sip_uri* pnexthop)
{
static char nexthop_buf[MAX_URI_SIZE];
if (!read_line(nexthop_buf, MAX_URI_SIZE, stream, &nexthop->len) || !nexthop->len) {
fifo_uac_error(response_file, 400, "next hop address expected\n");
return -1;
}
if (nexthop->len == 1 && nexthop_buf[0] == '.' ) {
DBG("DEBUG: fifo_get_nexthop: next hop empty\n");
nexthop->s = 0;
nexthop->len = 0;
} else if (parse_uri(nexthop_buf, nexthop->len, pnexthop) < 0 ) {
fifo_uac_error(response_file, 400, "next hop uri invalid\n");
return -2;
} else {
nexthop->s = nexthop_buf;
DBG("DEBUG: fifo_get_nexthop: hop: '%.*s'\n", nexthop->len, nexthop->s);
}
return 0;
}
/*
* Get method name from FIFO stream
*/
static inline int fifo_get_method(FILE* stream, char* response_file, str* method)
{
static char method_buf[MAX_METHOD];
if (!read_line(method_buf, MAX_METHOD, stream, &method->len) || !method->len) {
/* line breaking must have failed -- consume the rest
and proceed to a new request
*/
fifo_uac_error(response_file, 400, "method expected");
return -1;
}
method->s = method_buf;
DBG("fifo_get_method: method: '%.*s'\n", method->len, method->s);
return 0;
}
/*
* Get message body from FIFO stream
*/
static inline int fifo_get_body(FILE* stream, char* response_file, str* body)
{
static char body_buf[MAX_BODY];
if (!read_body(body_buf, MAX_BODY, stream, &body->len)) {
fifo_uac_error(response_file, 400, "body expected");
return -1;
}
body->s = body_buf;
DBG("fifo_get_body: body: %.*s\n", body->len, body->s);
return 0;
}
/*
* Get message headers from FIFO stream
*/
static inline int fifo_get_headers(FILE* stream, char* response_file, str* headers)
{
static char headers_buf[MAX_HEADER];
/* now read and parse header fields */
if (!read_line_set(headers_buf, MAX_HEADER, stream, &headers->len) || !headers->len) {
fifo_uac_error(response_file, 400, "HFs expected");
return -1;
}
headers->s = headers_buf;
DBG("fifo_get_headers: headers: %.*s\n", headers->len, headers->s);
return 0;
}
/*
* Create shm_copy of filename
*/
static inline int fifo_cbp(char** shm_file, char* response_file)
{
int fn_len;
if (response_file) {
fn_len = strlen(response_file) + 1;
*shm_file = shm_malloc(fn_len);
if (!*shm_file) {
fifo_uac_error(response_file, 500, "no shmem");
return -1;
}
memcpy(*shm_file, response_file, fn_len);
} else {
*shm_file = 0;
}
return 0;
}
static inline struct str_list *new_str(char *s, int len, struct str_list **last, int *total)
{
struct str_list *new;
new=pkg_malloc(sizeof(struct str_list));
if (!new) {
LOG(L_ERR, "ERROR: new_str: not enough mem\n");
return 0;
}
new->s.s=s;
new->s.len=len;
new->next=0;
(*last)->next=new;
*last=new;
*total+=len;
return new;
}
static char *get_hfblock(str *uri, struct hdr_field *hf, int *l, int proto)
{
struct str_list sl, *last, *new, *i, *foo;
int hf_avail, frag_len, total_len;
char *begin, *needle, *dst, *ret, *d;
str *sock_name, *portname;
union sockaddr_union to_su;
struct socket_info* send_sock;
ret=0; /* pessimist: assume failure */
total_len=0;
last=&sl;
last->next=0;
portname=sock_name=0;
for (; hf; hf=hf->next) {
if (skip_hf(hf)) continue;
begin=needle=hf->name.s;
hf_avail=hf->len;
/* substitution loop */
while(hf_avail) {
d=memchr(needle, SUBST_CHAR, hf_avail);
if (!d || d+1>=needle+hf_avail) { /* nothing to substitute */
new=new_str(begin, hf_avail, &last, &total_len);
if (!new) goto error;
break;
} else {
frag_len=d-begin;
d++; /* d not at the second substitution char */
switch(*d) {
case SUBST_CHAR: /* double SUBST_CHAR: IP */
/* string before substitute */
new=new_str(begin, frag_len, &last, &total_len);
if (!new) goto error;
/* substitute */
if (!sock_name) {
send_sock=uri2sock(0, uri, &to_su, proto );
if (!send_sock) {
LOG(L_ERR, "ERROR: get_hfblock: send_sock failed\n");
goto error;
}
sock_name=&send_sock->address_str;
portname=&send_sock->port_no_str;
}
new=new_str(sock_name->s, sock_name->len,
&last, &total_len );
if (!new) goto error;
/* inefficient - FIXME --andrei*/
new=new_str(":", 1, &last, &total_len);
if (!new) goto error;
new=new_str(portname->s, portname->len,
&last, &total_len );
if (!new) goto error;
/* keep going ... */
begin=needle=d+1;hf_avail-=frag_len+2;
continue;
default:
/* no valid substitution char -- keep going */
hf_avail-=frag_len+1;
needle=d;
}
} /* possible substitute */
} /* substitution loop */
/* proceed to next header */
/* new=new_str(CRLF, CRLF_LEN, &last, &total_len );
if (!new) goto error; */
DBG("DEBUG: get_hfblock: one more hf processed\n");
} /* header loop */
/* construct a single header block now */
ret=pkg_malloc(total_len);
if (!ret) {
LOG(L_ERR, "ERROR: get_hfblock no pkg mem for hf block\n");
goto error;
}
i=sl.next;
dst=ret;
while(i) {
foo=i;
i=i->next;
memcpy(dst, foo->s.s, foo->s.len);
dst+=foo->s.len;
pkg_free(foo);
}
*l=total_len;
return ret;
error:
i=sl.next;
while(i) {
foo=i;
i=i->next;
pkg_free(foo);
}
*l=0;
return 0;
}
/* syntax:
:t_uac:[file] EOL
method EOL
r-uri EOL
dst EOL // ("." if no outbound server used)
// must be used with dialogs/lr
<EOL separated HFs>+ // From and To must be present at least;
// dialog-apps must include tag in From
// (an ephemeral is appended otherwise)
// and supply CSeq/CallId
.[EOL]
[body]
.EOL
there is also the possibility to have server placed its
hostname:portnumber in header fields -- just put double
exclamation mark in any of the optional header fields
(i.e., any but From/To/CallID,CSeq), they will be
substituted hn:pn
Example:
sc fifo t_uac_dlg MESSAGE sip:joe@192.168.2.1 \
. \ # no outbound proxy
'From:sender@iptel.org;tagd=123' \ # no to-tag -> ephemeral
'To:sender@iptel.org' \
'Foo: sip:user@!! ' \ # expansion here
'CSEQ: 11 MESSAGE ' \
. \ # EoH
. # empty body
---
U 192.168.2.16:5060 -> 192.168.2.1:5060
MESSAGE sip:joe@192.168.2.1 SIP/2.0..
Via: SIP/2.0/UDP 192.168.2.16;branch=z9hG4bK760c.922ea6a1.0..
To: sender@iptel.org..
From: sender@iptel.org;tagd=123;tag=5405e669bc2980663aed2624dc31396f-fa77..
CSeq: 11 MESSAGE..
Call-ID: e863bf56-22255@192.168.2.16..
Content-Length: 0..
User-Agent: Sip EXpress router (0.8.11pre4-tcp1-locking (i386/linux))..
Foo: sip:user@192.168.2.16:5060..
..
*/
/*
* Make sure that the FIFO user created the message
* correctly
*/
static inline int fifo_check_msg(struct sip_msg* msg, str* method, char* resp, str* body,
int* fromtag, int *cseq_is, int* cseq, str* callid)
{
struct to_body* parsed_from;
struct cseq_body *parsed_cseq;
int i;
char c;
if (body->len && !msg->content_type) {
fifo_uac_error(resp, 400, "Content-Type missing");
return -1;
}
if (body->len && msg->content_length) {
fifo_uac_error(resp, 400, "Content-Length disallowed");
return -2;
}
if (!msg->to) {
fifo_uac_error(resp, 400, "To missing");
return -3;
}
if (!msg->from) {
fifo_uac_error(resp, 400, "From missing");
return -4;
}
/* we also need to know if there is from-tag and add it otherwise */
if (parse_from_header(msg) < 0) {
fifo_uac_error(resp, 400, "Error in From");
return -5;
}
parsed_from = (struct to_body*)msg->from->parsed;
*fromtag = parsed_from->tag_value.s && parsed_from->tag_value.len;
*cseq = 0;
if (msg->cseq && (parsed_cseq = get_cseq(msg))) {
*cseq_is = 1;
for (i = 0; i < parsed_cseq->number.len; i++) {
c = parsed_cseq->number.s[i];
if (c >= '0' && c <= '9' ) *cseq = (*cseq) * 10 + c - '0';
else {
DBG("found non-numerical in CSeq: <%i>='%c'\n",(unsigned int)c,c);
fifo_uac_error(resp, 400, "non-numerical CSeq");
return -6;
}
}
if (parsed_cseq->method.len != method->len
|| memcmp(parsed_cseq->method.s, method->s, method->len) !=0 ) {
fifo_uac_error(resp, 400, "CSeq method mismatch");
return -7;
}
} else {
*cseq_is = 0;
}
if (msg->callid) {
callid->s = msg->callid->body.s;
callid->len = msg->callid->body.len;
} else {
callid->s = 0;
callid->len = 0;
}
return 0;
}
#define FIFO_ROUTE_PREFIX "Route: "
#define FIFO_ROUTE_SEPARATOR ", "
static inline void print_routes(FILE* out, dlg_t* _d)
{
rr_t* ptr;
ptr = _d->hooks.first_route;
if (ptr) {
fprintf(out, FIFO_ROUTE_PREFIX);
} else {
fprintf(out, ".\n");
return;
}
while(ptr) {
fprintf(out, "%.*s", ptr->len, ptr->nameaddr.name.s);
ptr = ptr->next;
if (ptr) {
fprintf(out, FIFO_ROUTE_SEPARATOR);
}
}
if (_d->hooks.last_route) {
fprintf(out, FIFO_ROUTE_SEPARATOR "<");
fprintf(out, "%.*s", _d->hooks.last_route->len, _d->hooks.last_route->s);
fprintf(out, ">");
}
if (_d->hooks.first_route) {
fprintf(out, CRLF);
}
}
static inline int print_uris(FILE* out, struct sip_msg* reply)
{
dlg_t* dlg;
dlg = (dlg_t*)shm_malloc(sizeof(dlg_t));
if (!dlg) {
LOG(L_ERR, "print_uris(): No memory left\n");
return -1;
}
memset(dlg, 0, sizeof(dlg_t));
if (dlg_response_uac(dlg, reply) < 0) {
LOG(L_ERR, "print_uris(): Error while creating dialog structure\n");
free_dlg(dlg);
return -2;
}
if (dlg->state != DLG_CONFIRMED) {
fprintf(out, ".\n.\n.\n");
free_dlg(dlg);
return 0;
}
if (dlg->hooks.request_uri->s) {
fprintf(out, "%.*s\n", dlg->hooks.request_uri->len, dlg->hooks.request_uri->s);
} else {
fprintf(out, ".\n");
}
if (dlg->hooks.next_hop->s) {
fprintf(out, "%.*s\n", dlg->hooks.next_hop->len, dlg->hooks.next_hop->s);
} else {
fprintf(out, ".\n");
}
print_routes(out, dlg);
free_dlg(dlg);
return 0;
}
static void fifo_callback( struct cell *t, int type, struct tmcb_params *ps )
{
char *filename;
FILE* f;
str text;
DBG("!!!!! ref_counter: %d\n", t->ref_count);
DBG("DEBUG: fifo UAC completed with status %d\n", ps->code);
if (!*ps->param) {
LOG(L_INFO, "INFO: fifo UAC completed with status %d\n", ps->code);
return;
}
filename=(char *)(*ps->param);
if (ps->rpl==FAKED_REPLY) {
get_reply_status( &text, ps->rpl, ps->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");
goto done;
}
fifo_reply(filename, "%.*s\n", text.len, text.s );
pkg_free(text.s);
} else {
text.s = ps->rpl->first_line.u.reply.reason.s;
text.len = ps->rpl->first_line.u.reply.reason.len;
f = open_reply_pipe(filename);
if (!f) return;
fprintf(f, "%d %.*s\n", ps->rpl->first_line.u.reply.statuscode, text.len, text.s);
print_uris(f, ps->rpl);
fprintf(f, "%s\n", ps->rpl->headers->name.s);
fclose(f);
}
DBG("DEBUG: fifo_callback successfully completed\n");
done:
shm_free(filename);
}
int fifo_uac(FILE *stream, char *response_file)
{
str method, ruri, nexthop, headers, body, hfb, callid;
struct sip_uri puri, pnexthop;
struct sip_msg faked_msg;
int ret, sip_error, err_ret;
int fromtag, cseq_is, cseq;
struct cb_data;
char err_buf[MAX_REASON_LEN];
char* shm_file;
dlg_t dlg;
if (fifo_get_method(stream, response_file, &method) < 0) return 1;
if (fifo_get_ruri(stream, response_file, &ruri, &puri) < 0) return 1;
if (fifo_get_nexthop(stream, response_file, &nexthop, &pnexthop) < 0) return 1;
if (fifo_get_headers(stream, response_file, &headers) < 0) return 1;
/* use SIP parser to look at what is in the FIFO request */
memset(&faked_msg, 0, sizeof(struct sip_msg));
faked_msg.len = headers.len;
faked_msg.buf = faked_msg.unparsed = headers.s;
if (parse_headers(&faked_msg, HDR_EOH, 0) == -1 ) {
DBG("DEBUG: fifo_uac: parse_headers failed\n");
fifo_uac_error(response_file, 400, "HFs unparseable");
goto error;
}
DBG("DEBUG: fifo_uac: parse_headers succeeded\n");
if (fifo_get_body(stream, response_file, &body) < 0) goto error;
/* at this moment, we collected all the things we got, let's
* verify user has not forgotten something */
if (fifo_check_msg(&faked_msg, &method, response_file, &body, &fromtag,
&cseq_is, &cseq, &callid) < 0) goto error;
hfb.s = get_hfblock(nexthop.len ? &nexthop : &ruri,
faked_msg.headers, &hfb.len, PROTO_UDP);
if (!hfb.s) {
fifo_uac_error(response_file, 500, "no mem for hf block");
goto error;
}
DBG("DEBUG: fifo_uac: EoL -- proceeding to transaction creation\n");
memset(&dlg, 0, sizeof(dlg_t));
/* Fill in Call-ID, use given Call-ID if
* present and generate it if not present
*/
if (callid.s && callid.len) dlg.id.call_id = callid;
else generate_callid(&dlg.id.call_id);
/* We will not fill in dlg->id.rem_tag because
* if present it will be printed within To HF
*/
/* Generate fromtag if not present */
if (!fromtag) {
generate_fromtag(&dlg.id.loc_tag, &dlg.id.call_id);
}
/* Fill in CSeq */
if (cseq_is) dlg.loc_seq.value = cseq;
else dlg.loc_seq.value = DEFAULT_CSEQ;
dlg.loc_seq.is_set = 1;
dlg.loc_uri = faked_msg.from->body;
dlg.rem_uri = faked_msg.to->body;
dlg.hooks.request_uri = &ruri;
dlg.hooks.next_hop = (nexthop.len ? &nexthop : &ruri);
#ifdef XL_DEBUG
print_dlg(stderr, &dlg);
#endif
/* we got it all, initiate transaction now! */
if (fifo_cbp(&shm_file, response_file) < 0) goto error01;
ret = t_uac(&method, &hfb, &body, &dlg, fifo_callback, shm_file);
if (ret <= 0) {
err_ret = err2reason_phrase(ret, &sip_error, err_buf,
sizeof(err_buf), "FIFO/UAC") ;
if (err_ret > 0 )
{
fifo_uac_error(response_file, sip_error, err_buf);
} else {
fifo_uac_error(response_file, 500, "FIFO/UAC error");
}
}
error01:
pkg_free(hfb.s);
error:
/* free_sip_msg(&faked_msg); */
if (faked_msg.headers) free_hdr_field_lst(faked_msg.headers);
return 1;
}
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