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/*
* Copyright (C) 2004 Tomasz Kojm <tkojm@clamav.net>
*
* This program 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.
*
* This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
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#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <sys/types.h>
#include "memory.h"
#include "output.h"
#ifndef PACKETSZ
#define PACKETSZ 512
#endif
char *txtquery(const char *domain, unsigned int *ttl)
{
unsigned char answer[PACKETSZ], host[128], *pt, *txt;
int len, exp, cttl, size, txtlen, type;
if(res_init() < 0) {
mprintf("@res_init failed\n");
return NULL;
}
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memset(answer, 0, PACKETSZ);
if((len = res_query(domain, C_IN, T_TXT, answer, PACKETSZ)) < 0) {
mprintf("@Can't query %s\n", domain);
return NULL;
}
pt = answer + sizeof(HEADER);
if((exp = dn_expand(answer, answer + len, pt, host, sizeof(host))) < 0) {
mprintf("@dn_expand failed\n");
return NULL;
}
pt += exp;
GETSHORT(type, pt);
if(type != T_TXT) {
mprintf("@Broken DNS reply.\n");
return NULL;
}
pt += INT16SZ; /* class */
if((exp = dn_expand(answer, answer + len, pt, host, sizeof(host))) < 0) {
mprintf("@second dn_expand failed\n");
return NULL;
}
pt += exp;
GETSHORT(type, pt);
if(type != T_TXT) {
mprintf("@Not a TXT record\n");
return NULL;
}
pt += INT16SZ; /* class */
GETLONG(cttl, pt);
*ttl = cttl;
GETSHORT(size, pt);
txtlen = *pt;
if(txtlen >= size || !txtlen) {
mprintf("@Broken TXT record (txtlen = %d, size = %d)\n", txtlen, size);
return NULL;
}
if(!(txt = mmalloc(txtlen + 1)))
return NULL;
pt++;
strncpy(txt, pt, txtlen);
txt[txtlen] = 0;
return txt;
}
#else
char *txtquery(const char *domain, unsigned int *ttl)
{
return NULL;
}
#endif |