/*
* $Id: uac_unixsock.c,v 1.8 2004/11/09 15:15:12 andrei Exp $
*
* Copyright (C) 2001-2004 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
*/
#include <string.h>
#include "../../mem/mem.h"
#include "../../mem/shm_mem.h"
#include "../../parser/hf.h"
#include "../../dprint.h"
#include "../../parser/parse_uri.h"
#include "../../unixsock_server.h"
#include "../../parser/msg_parser.h"
#include "../../parser/parse_to.h"
#include "../../parser/parse_cseq.h"
#include "../../parser/parse_from.h"
#include "../../ut.h"
#include "uac_unixsock.h"
#include "config.h"
#include "ut.h"
#include "t_hooks.h"
#include "callid.h"
#include "uac.h"
#include "dlg.h"
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) \
)
/*
* Read the method from the request
*/
static int get_method(str* method, str* msg)
{
if (unixsock_read_line(method, msg) != 0) {
unixsock_reply_asciiz("400 Method expected");
unixsock_reply_send();
return -1;
}
DBG("get_method: method: '%.*s'\n", method->len, ZSW(method->s));
return 0;
}
/*
* Read the Request-URI and parse it
*/
static int get_ruri(str* ruri, struct sip_uri* puri, str* msg)
{
if (unixsock_read_line(ruri, msg) != 0) {
unixsock_reply_asciiz("400 Request-URI expected");
unixsock_reply_send();
return -1;
}
if (parse_uri(ruri->s, ruri->len, puri) < 0 ) {
unixsock_reply_asciiz("400 Request-URI is invalid\n");
unixsock_reply_send();
return -1;
}
DBG("get_ruri: '%.*s'\n", ruri->len, ZSW(ruri->s));
return 0;
}
/*
* Read and parse the next hop
*/
static int get_nexthop(str* nexthop, struct sip_uri* pnexthop, str* msg)
{
if (unixsock_read_line(nexthop, msg) != 0) {
unixsock_reply_asciiz("400 Next-hop URI expected\n");
unixsock_reply_send();
return -1;
}
if (nexthop->len == 1 && nexthop->s[0] == '.' ) {
DBG("get_nexthop: next hop empty\n");
nexthop->s = 0;
nexthop->len = 0;
} else if (parse_uri(nexthop->s, nexthop->len, pnexthop) < 0 ) {
unixsock_reply_asciiz("400 Next-hop URI is invalid\n");
unixsock_reply_send();
return -1;
} else {
DBG("get_nexthop: '%.*s'\n", nexthop->len, ZSW(nexthop->s));
}
return 0;
}
/*
* Read header into a static buffer (it is necessary because
* the unixsock_read_lineset performs CRLF recovery and thus
* the result may be longer than the original
*/
static int get_headers(str* headers, str* msg)
{
static char headers_buf[MAX_HEADER];
headers->s = headers_buf;
headers->len = MAX_HEADER;
/* now read and parse header fields */
if (unixsock_read_lineset(headers, msg) < 0) {
unixsock_reply_asciiz("400 Header fields expected\n");
unixsock_reply_send();
return -1;
}
DBG("get_headers: %.*s\n", headers->len, ZSW(headers->s));
return 0;
}
/*
* Read the message body
*/
static int get_body_lines(str* body, str* msg)
{
if (unixsock_read_body(body, msg) < 0) {
unixsock_reply_asciiz("400 Body expected\n");
unixsock_reply_send();
return -1;
}
DBG("get_body_lines: %.*s\n", body->len, ZSW(body->s));
return 0;
}
/*
* Make sure that the FIFO user created the message
* correctly
*/
static int check_msg(struct sip_msg* msg, str* method, 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) {
unixsock_reply_asciiz("400 Content-Type missing");
goto err;
}
if (body->len && msg->content_length) {
unixsock_reply_asciiz("400 Content-Length disallowed");
goto err;
}
if (!msg->to) {
unixsock_reply_asciiz("400 To missing");
goto err;
}
if (!msg->from) {
unixsock_reply_asciiz("400 From missing");
goto err;
}
/* we also need to know if there is from-tag and add it otherwise */
if (parse_from_header(msg) < 0) {
unixsock_reply_asciiz("400 Error in From");
goto err;
}
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("check_msg: Found non-numerical in CSeq: <%i>='%c'\n", (unsigned int)c, c);
unixsock_reply_asciiz("400 Non-numerical CSeq");
goto err;
}
}
if (parsed_cseq->method.len != method->len
|| memcmp(parsed_cseq->method.s, method->s, method->len) !=0 ) {
unixsock_reply_asciiz("400 CSeq method mismatch");
goto err;
}
} 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;
err:
unixsock_reply_send();
return -1;
}
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, "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, *i, *foo;
int p, 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;
p = hf->len;
/* substitution loop */
while(p) {
d = q_memchr(needle, SUBST_CHAR, p);
if (!d || d + 1 >= needle + p) { /* nothing to substitute */
if (!new_str(begin, p, &last, &total_len)) 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 */
if (!new_str(begin, frag_len, &last, &total_len)) 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;
}
if (!new_str(sock_name->s, sock_name->len, &last, &total_len)) goto error;
/* inefficient - FIXME --andrei*/
if (!new_str(":", 1, &last, &total_len)) goto error;
if (!new_str(portname->s, portname->len, &last, &total_len)) goto error;
/* keep going ... */
begin = needle = d + 1;
p -= frag_len + 2;
continue;
default:
/* no valid substitution char -- keep going */
p -= frag_len + 1;
needle = d;
}
} /* possible substitute */
} /* substitution loop */
DBG("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, "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;
}
#define FIFO_ROUTE_PREFIX "Route: "
#define FIFO_ROUTE_SEPARATOR ", "
static void print_routes(dlg_t* _d)
{
rr_t* ptr;
ptr = _d->hooks.first_route;
if (ptr) {
unixsock_reply_asciiz(FIFO_ROUTE_PREFIX);
} else {
unixsock_reply_asciiz(".\n");
return;
}
while(ptr) {
unixsock_reply_printf("%.*s", ptr->len, ptr->nameaddr.name.s);
ptr = ptr->next;
if (ptr) {
unixsock_reply_asciiz(FIFO_ROUTE_SEPARATOR);
}
}
if (_d->hooks.last_route) {
unixsock_reply_asciiz(FIFO_ROUTE_SEPARATOR "<");
unixsock_reply_printf("%.*s", _d->hooks.last_route->len, _d->hooks.last_route->s);
unixsock_reply_asciiz(">");
}
if (_d->hooks.first_route) {
unixsock_reply_asciiz(CRLF);
}
}
static int print_uris(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) {
unixsock_reply_asciiz(".\n.\n.\n");
free_dlg(dlg);
return 0;
}
if (dlg->hooks.request_uri->s) {
unixsock_reply_printf("%.*s\n", dlg->hooks.request_uri->len, dlg->hooks.request_uri->s);
} else {
unixsock_reply_asciiz(".\n");
}
if (dlg->hooks.next_hop->s) {
unixsock_reply_printf("%.*s\n", dlg->hooks.next_hop->len, dlg->hooks.next_hop->s);
} else {
unixsock_reply_asciiz(".\n");
}
print_routes(dlg);
free_dlg(dlg);
return 0;
}
static void callback(struct cell *t, int type, struct tmcb_params *ps)
{
struct sockaddr_un* to;
str text;
if (!*ps->param) {
LOG(L_INFO, "INFO: fifo UAC completed with status %d\n", ps->code);
return;
}
to = (struct sockaddr_un*)(*ps->param);
unixsock_reply_reset();
if (ps->rpl == FAKED_REPLY) {
get_reply_status(&text, ps->rpl, ps->code);
if (text.s == 0) {
LOG(L_ERR, "callback: get_reply_status failed\n");
unixsock_reply_asciiz("500 callback: get_reply_status failed\n");
goto done;
}
unixsock_reply_printf("%.*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;
/* FIXME: check for return values here */
unixsock_reply_printf("%d %.*s\n", ps->rpl->first_line.u.reply.statuscode, text.len, text.s);
print_uris(ps->rpl);
unixsock_reply_printf("%s\n", ps->rpl->headers->name.s);
}
done:
unixsock_reply_sendto(to);
shm_free(to);
*ps->param=0; /* 0 it so the callback won't do anything if called
for a retransmission */
}
/*
* Create shm_copy of filename
*/
static int duplicate_addr(struct sockaddr_un** dest, struct sockaddr_un* addr)
{
if (addr) {
*dest = shm_malloc(sizeof(*addr));
if (!*dest) {
unixsock_reply_asciiz("500 No shared memory");
return -1;
}
memcpy(*dest, addr, sizeof(*addr));
} else {
*dest = 0;
}
return 0;
}
int unixsock_uac(str* msg)
{
str method, ruri, nexthop, headers, body, hfb, callid;
struct sip_uri puri, pnexthop;
struct sip_msg faked_msg;
int ret, sip_error, err_ret, fromtag, cseq_is, cseq;
char err_buf[MAX_REASON_LEN];
struct sockaddr_un* shm_sockaddr;
dlg_t dlg;
if (get_method(&method, msg) < 0) return -1;
if (get_ruri(&ruri, &puri, msg) < 0) return -1;
if (get_nexthop(&nexthop, &pnexthop, msg) < 0) return -1;
if (get_headers(&headers, msg) < 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 ) {
unixsock_reply_asciiz("400 HFs unparsable\n");
unixsock_reply_send();
goto error;
}
if (get_body_lines(&body, msg) < 0) goto error;
/* at this moment, we collected all the things we got, let's
* verify user has not forgotten something */
if (check_msg(&faked_msg, &method, &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) {
unixsock_reply_asciiz("500 No memory for HF block");
unixsock_reply_send();
goto error;
}
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);
/* we got it all, initiate transaction now! */
if (duplicate_addr(&shm_sockaddr, unixsock_sender_addr()) < 0) goto error01;
ret = t_uac(&method, &hfb, &body, &dlg, callback, shm_sockaddr);
if (ret <= 0) {
err_ret = err2reason_phrase(ret, &sip_error, err_buf, sizeof(err_buf), "FIFO/UAC");
if (err_ret > 0) {
unixsock_reply_printf("%d %s", sip_error, err_buf);
} else {
unixsock_reply_asciiz("500 UNIXSOCK/UAC error");
}
unixsock_reply_send();
shm_free(shm_sockaddr);
goto error01;
}
/* Do not free shm_sockaddr here, it will be used
* by the callback
*/
pkg_free(hfb.s);
if (faked_msg.headers) free_hdr_field_lst(faked_msg.headers);
return 0;
error01:
pkg_free(hfb.s);
error:
if (faked_msg.headers) free_hdr_field_lst(faked_msg.headers);
return -1;
}
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