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ngircd-tor
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add reverse lookup check

This commit is contained in:
Florian Westphal 2005-07-24 21:42:00 +00:00
parent 9db49e8f2c
commit 6ecccd2644
1 changed files with 21 additions and 4 deletions
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25
src/ngircd/resolve.c
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@ -14,7 +14,7 @@
#include "portab.h"
static char UNUSED id[] = "$Id: resolve.c,v 1.13 2005/07/07 18:39:08 fw Exp $";
static char UNUSED id[] = "$Id: resolve.c,v 1.14 2005/07/24 21:42:00 fw Exp $";
#include "imp.h"
#include <assert.h>
@ -185,8 +185,10 @@ Do_ResolveAddr( struct sockaddr_in *Addr, int w_fd )
* pipe to parent. */
char hostname[HOST_LEN];
char ipstr[HOST_LEN];
struct hostent *h;
size_t len;
struct in_addr *addr;
#ifdef IDENTAUTH
char *res;
#endif
@ -194,15 +196,30 @@ Do_ResolveAddr( struct sockaddr_in *Addr, int w_fd )
/* Resolve IP address */
Log_Resolver( LOG_DEBUG, "Now resolving %s ...", inet_ntoa( Addr->sin_addr ));
h = gethostbyaddr( (char *)&Addr->sin_addr, sizeof( Addr->sin_addr ), AF_INET );
if( h ) strlcpy( hostname, h->h_name, sizeof( hostname ));
else
{
if (!h) {
#ifdef h_errno
Log_Resolver( LOG_WARNING, "Can't resolve address \"%s\": %s!", inet_ntoa( Addr->sin_addr ), Get_Error( h_errno ));
#else
Log_Resolver( LOG_WARNING, "Can't resolve address \"%s\"!", inet_ntoa( Addr->sin_addr ));
#endif
strlcpy( hostname, inet_ntoa( Addr->sin_addr ), sizeof( hostname ));
} else {
strlcpy( hostname, h->h_name, sizeof( hostname ));
h = gethostbyname( hostname );
if ( h ) {
if (memcmp(h->h_addr, &Addr->sin_addr, sizeof (struct in_addr))) {
addr = (struct in_addr*) h->h_addr;
strlcpy(ipstr, inet_ntoa(*addr), sizeof ipstr);
Log(LOG_WARNING,"Possible forgery: %s resolved to %s (which is at ip %s!)",
inet_ntoa( Addr->sin_addr), hostname, ipstr);
strlcpy( hostname, inet_ntoa( Addr->sin_addr ), sizeof( hostname ));
}
} else {
Log(LOG_WARNING, "Possible forgery: %s resolved to %s (which has no ip address)",
inet_ntoa( Addr->sin_addr ), hostname);
strlcpy( hostname, inet_ntoa( Addr->sin_addr ), sizeof( hostname ));
}
}
Log_Resolver( LOG_DEBUG, "Ok, translated %s to \"%s\".", inet_ntoa( Addr->sin_addr ), hostname );