uac_unixsock.c

来自「性能优秀的SIP Proxy」· C语言 代码 · 共 624 行 · 第 1/2 页

/*
 * $Id: uac_unixsock.c,v 1.4 2006/04/05 08:47:38 bogdan_iancu Exp $
 *
 * Copyright (C) 2001-2004 FhG Fokus
 *
 * This file is part of openser, a free SIP server.
 *
 * openser 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
 *
 * openser 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;
};

struct uac_cb_param {
    str from;
    str callid;
    str cseq;
    struct sockaddr_un addr;
};

#define skip_hf(_hf) (               \
    ((_hf)->type == HDR_FROM_T)   || \
    ((_hf)->type == HDR_TO_T)     || \
    ((_hf)->type == HDR_CALLID_T) || \
    ((_hf)->type == HDR_CSEQ_T)      \
)


/*
 * 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;