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/* $Id: functions.h,v 1.6 2006/02/03 18:04:22 bogdan_iancu Exp $
*
* Copyright (C) 2004 Dan Pascu
* Copyright (C) 2003 Porta Software Ltd
*
* 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
*
*/
static void
pingClients(unsigned int ticks, void *param)
{
static char pingbuf[4] = "\0\0\0\0";
static int length = 256;
struct socket_info* sock;
struct hostent* hostent;
union sockaddr_union to;
unsigned int flags;
struct sip_uri uri;
void *buf, *ptr;
str contact;
int needed;
int proto;
buf = pkg_malloc(length);
if (buf == NULL) {
LOG(L_ERR, "error: mediaproxy/pingClients(): out of memory\n");
return;
}
needed = userLocation.get_all_ucontacts(buf, length, FL_NAT);
if (needed > 0) {
// make sure we alloc more than actually we were told is missing
// (some clients may register while we are making these calls)
length = (length + needed) * 2;
ptr = pkg_realloc(buf, length);
if (ptr == NULL) {
LOG(L_ERR, "error: mediaproxy/pingClients(): out of memory\n");
pkg_free(buf);
return;
} else {
buf = ptr;
}
// try again. we may fail again if _many_ clients register in between
needed = userLocation.get_all_ucontacts(buf, length, FL_NAT);
if (needed != 0) {
pkg_free(buf);
return;
}
}
ptr = buf;
while (1) {
memcpy(&(contact.len), ptr, sizeof(contact.len));
if (contact.len == 0)
break;
contact.s = (char*)ptr + sizeof(contact.len);
ptr = contact.s + contact.len;
memcpy( &sock, ptr, sizeof(sock));
ptr += sizeof(sock);
memcpy( &flags, ptr, sizeof(flags));
ptr += sizeof(flags);
if (parse_uri(contact.s, contact.len, &uri) < 0) {
LOG(L_ERR, "error: mediaproxy/pingClients(): can't parse contact uri\n");
continue;
}
if (uri.proto != PROTO_UDP && uri.proto != PROTO_NONE)
continue;
if (uri.port_no == 0)
uri.port_no = SIP_PORT;
proto = uri.proto;
hostent = sip_resolvehost(&uri.host, &uri.port_no, &proto, 0);
if (hostent == NULL){
LOG(L_ERR, "error: mediaproxy/pingClients(): can't resolve host\n");
continue;
}
hostent2su(&to, hostent, 0, uri.port_no);
if (sock==0) {
sock = get_send_socket(0, &to, PROTO_UDP);
if (sock == NULL) {
LOG(L_ERR, "error: mediaproxy/pingClients(): can't get "
"sending socket\n");
continue;
}
}
udp_send(sock, pingbuf, sizeof(pingbuf), &to);
}
pkg_free(buf);
}
// Replace IP:Port in Contact field with the source address of the packet.
// Preserve port for SIP asymmetric clients
static int
FixContact(struct sip_msg* msg, char* str1, char* str2)
{
str beforeHost, after, agent;
contact_t* contact;
struct lump* anchor;
struct sip_uri uri;
char *newip, *buf;
int len, newiplen, offset;
Bool asymmetric;
if (!getContactURI(msg, &uri, &contact))
return -1;
newip = ip_addr2a(&msg->rcv.src_ip);
newiplen = strlen(newip);
/* Don't do anything if the IP's are the same. Return success. */
if (newiplen==uri.host.len && memcmp(uri.host.s, newip, newiplen)==0) {
return 1;
}
if (uri.port.len == 0)
uri.port.s = uri.host.s + uri.host.len;
agent = getUserAgent(msg);
asymmetric = isSIPAsymmetric(agent);
beforeHost.s = contact->uri.s;
beforeHost.len = uri.host.s - contact->uri.s;
if (asymmetric) {
// for asymmetrics we preserve the original port
after.s = uri.port.s;
after.len = contact->uri.s + contact->uri.len - after.s;
} else {
after.s = uri.port.s + uri.port.len;
after.len = contact->uri.s + contact->uri.len - after.s;
}
len = beforeHost.len + newiplen + after.len + 20;
// first try to alloc mem. if we fail we don't want to have the lump
// deleted and not replaced. at least this way we keep the original.
buf = pkg_malloc(len);
if (buf == NULL) {
LOG(L_ERR, "error: fix_contact(): out of memory\n");
return -1;
}
offset = contact->uri.s - msg->buf;
anchor = del_lump(msg, offset, contact->uri.len, HDR_CONTACT_F);
if (!anchor) {
pkg_free(buf);
return -1;
}
if (asymmetric && uri.port.len==0) {
len = sprintf(buf, "%.*s%s%.*s", beforeHost.len, beforeHost.s,
newip, after.len, after.s);
} else if (asymmetric) {
len = sprintf(buf, "%.*s%s:%.*s", beforeHost.len, beforeHost.s,
newip, after.len, after.s);
} else {
len = sprintf(buf, "%.*s%s:%d%.*s", beforeHost.len, beforeHost.s,
newip, msg->rcv.src_port, after.len, after.s);
}
if (insert_new_lump_after(anchor, buf, len, HDR_CONTACT_F) == 0) {
pkg_free(buf);
return -1;
}
contact->uri.s = buf;
contact->uri.len = len;
if (asymmetric) {
LOG(L_INFO, "info: fix_contact(): preserved port for SIP "
"asymmetric client: `%.*s'\n", agent.len, agent.s);
}
return 1;
}
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