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proxy.c
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proxy.c
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/*
* proxy list & assoc. functions
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of opensips, a free SIP server.
*
* opensips 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
*
* opensips 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* History:
* -------
* 2003-02-13 all *proxy functions are now proto aware (andrei)
* 2003-03-19 replaced all mallocs/frees w/ pkg_malloc/pkg_free (andrei)
* 2007-01-25 support for DNS failover added into proxy structure;
* new shm functions for copy/free added (bogdan)
*/
#include "config.h"
#include "globals.h"
#include "proxy.h"
#include "error.h"
#include "dprint.h"
#include "mem/mem.h"
#include "mem/shm_mem.h"
#include <string.h>
#include <stdlib.h>
#include <sys/socket.h>
#ifdef DNS_IP_HACK
#include "ut.h"
#endif
#include "resolve.h"
#include "ip_addr.h"
#include "globals.h"
struct proxy_l* proxies=0;
int disable_dns_failover=0;
int hostent_shm_cpy(struct hostent *dst, struct hostent* src)
{
int i;
char *p;
for( i=0 ; src->h_addr_list[i] ; i++ );
dst->h_addr_list = (char**)shm_malloc
(i * (src->h_length + sizeof(char*)) + sizeof(char*));
if (dst->h_addr_list==NULL)
return -1;
p = ((char*)dst->h_addr_list) + (i+1)*sizeof(char*);
dst->h_addr_list[i] = 0;
for( i-- ; i>=0 ; i-- ) {
dst->h_addr_list[i] = p;
memcpy( dst->h_addr_list[i], src->h_addr_list[i], src->h_length );
p += src->h_length;
}
dst->h_addr = src->h_addr_list[0];
dst->h_addrtype = src->h_addrtype;
dst->h_length = src->h_length;
return 0;
}
void free_shm_hostent(struct hostent *dst)
{
if (dst->h_addr_list)
shm_free(dst->h_addr_list);
}
/* copies a hostent structure*, returns 0 on success, <0 on error*/
int hostent_cpy(struct hostent *dst, struct hostent* src)
{
unsigned int len,len2, i, r;
int ret;
/* start copying the host entry.. */
/* copy h_name */
len=strlen(src->h_name)+1;
dst->h_name=(char*)pkg_malloc(sizeof(char) * len);
if (dst->h_name) strncpy(dst->h_name,src->h_name, len);
else{
ser_error=ret=E_OUT_OF_MEM;
goto error;
}
/* copy h_aliases */
len=0;
if (src->h_aliases)
for (;src->h_aliases[len];len++);
dst->h_aliases=(char**)pkg_malloc(sizeof(char*)*(len+1));
if (dst->h_aliases==0){
ser_error=ret=E_OUT_OF_MEM;
pkg_free(dst->h_name);
goto error;
}
memset((void*)dst->h_aliases, 0, sizeof(char*) * (len+1) );
for (i=0;i<len;i++){
len2=strlen(src->h_aliases[i])+1;
dst->h_aliases[i]=(char*)pkg_malloc(sizeof(char)*len2);
if (dst->h_aliases[i]==0){
ser_error=ret=E_OUT_OF_MEM;
pkg_free(dst->h_name);
for(r=0; r<i; r++) pkg_free(dst->h_aliases[r]);
pkg_free(dst->h_aliases);
goto error;
}
strncpy(dst->h_aliases[i], src->h_aliases[i], len2);
}
/* copy h_addr_list */
len=0;
if (src->h_addr_list)
for (;src->h_addr_list[len];len++);
dst->h_addr_list=(char**)pkg_malloc(sizeof(char*)*(len+1));
if (dst->h_addr_list==0){
ser_error=ret=E_OUT_OF_MEM;
pkg_free(dst->h_name);
for(r=0; dst->h_aliases[r]; r++) pkg_free(dst->h_aliases[r]);
pkg_free(dst->h_aliases);
goto error;
}
memset((void*)dst->h_addr_list, 0, sizeof(char*) * (len+1) );
for (i=0;i<len;i++){
dst->h_addr_list[i]=(char*)pkg_malloc(sizeof(char)*src->h_length);
if (dst->h_addr_list[i]==0){
ser_error=ret=E_OUT_OF_MEM;
pkg_free(dst->h_name);
for(r=0; dst->h_aliases[r]; r++) pkg_free(dst->h_aliases[r]);
pkg_free(dst->h_aliases);
for (r=0; r<i;r++) pkg_free(dst->h_addr_list[r]);
pkg_free(dst->h_addr_list);
goto error;
}
memcpy(dst->h_addr_list[i], src->h_addr_list[i], src->h_length);
}
/* copy h_addr_type & length */
dst->h_addrtype=src->h_addrtype;
dst->h_length=src->h_length;
/*finished hostent copy */
return 0;
error:
LM_CRIT("pkg memory allocation failure\n");
return ret;
}
void free_hostent(struct hostent *dst)
{
int r;
if (dst->h_name) pkg_free(dst->h_name);
if (dst->h_aliases){
for(r=0; dst->h_aliases[r]; r++) {
pkg_free(dst->h_aliases[r]);
}
pkg_free(dst->h_aliases);
}
if (dst->h_addr_list){
for (r=0; dst->h_addr_list[r];r++) {
pkg_free(dst->h_addr_list[r]);
}
pkg_free(dst->h_addr_list);
}
}
/* Creates a proxy structure out of the host, port and proto
* uses also SRV if possible & port==0 (quick hack) */
struct proxy_l* mk_proxy(str* name, unsigned short port, unsigned short proto,
int is_sips)
{
struct proxy_l* p;
struct hostent* he;
p=(struct proxy_l*) pkg_malloc(sizeof(struct proxy_l));
if (p==0){
ser_error=E_OUT_OF_MEM;
LM_CRIT("pkg memory allocation failure\n");
goto error;
}
memset(p,0,sizeof(struct proxy_l));
p->name=*name;
p->port=port;
p->proto=proto;
LM_DBG("doing DNS lookup...\n");
he = sip_resolvehost(name, &(p->port), &p->proto, is_sips,
disable_dns_failover?0:&p->dn );
if (he==0){
ser_error=E_BAD_ADDRESS;
LM_CRIT("could not resolve hostname: \"%.*s\"\n", name->len, name->s);
pkg_free(p);
goto error;
}
if (hostent_cpy(&(p->host), he)!=0){
free_dns_res( p );
pkg_free(p);
goto error;
}
return p;
error:
return 0;
}
/* same as mk_proxy, but in shared memory
* uses also SRV if possible & port==0 (quick hack) */
struct proxy_l* mk_proxy_from_ip(struct ip_addr* ip, unsigned short port,
unsigned short proto)
{
struct proxy_l* p;
p=(struct proxy_l*) pkg_malloc(sizeof(struct proxy_l));
if (p==0){
LM_CRIT("pkg memory allocation failure\n");
goto error;
}
memset(p,0,sizeof(struct proxy_l));
p->port=port;
p->proto=proto;
p->host.h_addrtype=ip->af;
p->host.h_length=ip->len;
p->host.h_addr_list=pkg_malloc(2*sizeof(char*));
if (p->host.h_addr_list==0) goto error;
p->host.h_addr_list[1]=0;
p->host.h_addr_list[0]=pkg_malloc(ip->len+1);
if (p->host.h_addr_list[0]==0){
pkg_free(p->host.h_addr_list);
goto error;
}
memcpy(p->host.h_addr_list[0], ip->u.addr, ip->len);
p->host.h_addr_list[0][ip->len]=0;
return p;
error:
return 0;
}
void free_proxy(struct proxy_l* p)
{
if (p) {
free_hostent(&p->host);
free_dns_res( p );
}
}
void free_shm_proxy(struct proxy_l* p)
{
if (p) {
free_shm_hostent(&p->host);
free_dns_res(p);
}
}
/* same as add_proxy, but it doesn't add the proxy to the list
* uses also SRV if possible & port==0 (quick hack)
works in shared memory */
struct proxy_l* mk_shm_proxy(str* name, unsigned short port, unsigned short proto,
int is_sips)
{
struct proxy_l* p;
struct hostent* he;
p=(struct proxy_l*) shm_malloc(sizeof(struct proxy_l));
if (p==0){
ser_error=E_OUT_OF_MEM;
LM_CRIT("shm memory allocation failure\n");
goto error;
}
memset(p,0,sizeof(struct proxy_l));
p->name=*name;
p->port=port;
p->proto=proto;
LM_DBG("doing DNS lookup...\n");
he = sip_resolvehost(name, &(p->port), &p->proto, is_sips,
disable_dns_failover?0:&p->dn );
if (he==0){
ser_error=E_BAD_ADDRESS;
LM_CRIT("could not resolve hostname: \"%.*s\"\n", name->len, name->s);
shm_free(p);
goto error;
}
if (hostent_shm_cpy(&(p->host), he)!=0){
free_dns_res( p );
shm_free(p);
goto error;
}
return p;
error:
return 0;
}
/* clones a proxy into pkg memory */
struct proxy_l* clone_proxy(struct proxy_l *sp)
{
struct proxy_l *dp;
dp = (struct proxy_l*)pkg_malloc(sizeof(struct proxy_l));
if (dp==NULL) {
LM_ERR("no more pkg memory\n");
return 0;
}
memset( dp , 0 , sizeof(struct proxy_l));
dp->port = sp->port;
dp->proto = sp->proto;
dp->addr_idx = sp->addr_idx;
/* clone the hostent */
if (hostent_cpy( &dp->host, &sp->host)!=0)
goto error0;
/* clone the dns resolver */
if (sp->dn) {
dp->dn = dns_res_copy(sp->dn);
if (dp->dn==NULL)
goto error1;
}
return dp;
error1:
free_hostent(&dp->host);
error0:
pkg_free(dp);
return 0;
}