#include "portab.h"
-static char UNUSED id[] = "$Id: resolve.c,v 1.12 2005/05/28 10:46:50 fw Exp $";
+static char UNUSED id[] = "$Id: resolve.c,v 1.17 2005/07/31 20:13:08 alex Exp $";
#include "imp.h"
#include <assert.h>
#include "exp.h"
#include "resolve.h"
+#include "io.h"
#ifdef IDENTAUTH
-LOCAL void Do_ResolveAddr PARAMS(( struct sockaddr_in *Addr, int Sock, int w_fd ));
+static void Do_ResolveAddr PARAMS(( struct sockaddr_in *Addr, int Sock, int w_fd ));
#else
-LOCAL void Do_ResolveAddr PARAMS(( struct sockaddr_in *Addr, int w_fd ));
+static void Do_ResolveAddr PARAMS(( struct sockaddr_in *Addr, int w_fd ));
#endif
-LOCAL void Do_ResolveName PARAMS(( char *Host, int w_fd ));
+static void Do_ResolveName PARAMS(( char *Host, int w_fd ));
#ifdef h_errno
-LOCAL char *Get_Error PARAMS(( int H_Error ));
+static char *Get_Error PARAMS(( int H_Error ));
#endif
-LOCAL RES_STAT *New_Res_Stat PARAMS(( void ));
+static RES_STAT *New_Res_Stat PARAMS(( void ));
-GLOBAL void
-Resolve_Init( void )
-{
- /* Initialize module */
-
- FD_ZERO( &Resolver_FDs );
-} /* Resolve_Init */
+static void
+cb_resolver(int fd, short unused) {
+ (void) unused; /* shut up compiler warning */
+ Read_Resolver_Result(fd);
+}
#ifdef IDENTAUTH
pid = fork( );
if( pid > 0 )
{
+ close( s->pipe[1] );
/* Main process */
Log( LOG_DEBUG, "Resolver for %s created (PID %d).", inet_ntoa( Addr->sin_addr ), pid );
- FD_SET( s->pipe[0], &Resolver_FDs );
- if( s->pipe[0] > Conn_MaxFD ) Conn_MaxFD = s->pipe[0];
+ if (!io_setnonblock( s->pipe[0] )) {
+ Log( LOG_DEBUG, "Could not set Non-Blocking mode for pipefd %d", s->pipe[0] );
+ goto out;
+ }
+ if (!io_event_create( s->pipe[0], IO_WANTREAD, cb_resolver )) {
+ Log( LOG_DEBUG, "Could not add pipefd %dto event watchlist: %s",
+ s->pipe[0], strerror(errno) );
+ goto out;
+ }
s->pid = pid;
return s;
}
else if( pid == 0 )
{
+ close( s->pipe[0] );
/* Sub process */
Log_Init_Resolver( );
#ifdef IDENTAUTH
Log_Exit_Resolver( );
exit( 0 );
}
- else
- {
- /* Error! */
- free( s );
- Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
- return NULL;
- }
+
+ Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
+
+out: /* Error! */
+ close( s->pipe[0] );
+ free( s );
+return NULL;
} /* Resolve_Addr */
pid = fork( );
if( pid > 0 )
{
+ close( s->pipe[1] );
/* Main process */
Log( LOG_DEBUG, "Resolver for \"%s\" created (PID %d).", Host, pid );
- FD_SET( s->pipe[0], &Resolver_FDs );
- if( s->pipe[0] > Conn_MaxFD ) Conn_MaxFD = s->pipe[0];
+ if (!io_setnonblock( s->pipe[0] )) {
+ Log( LOG_DEBUG, "Could not set Non-Blocking mode for pipefd %d", s->pipe[0] );
+ goto out;
+ }
+ if (!io_event_create( s->pipe[0], IO_WANTREAD, cb_resolver )) {
+ Log( LOG_DEBUG, "Could not add pipefd %dto event watchlist: %s",
+ s->pipe[0], strerror(errno) );
+ goto out;
+ }
s->pid = pid;
return s;
}
else if( pid == 0 )
{
+ close( s->pipe[0] );
/* Sub process */
Log_Init_Resolver( );
Do_ResolveName( Host, s->pipe[1] );
Log_Exit_Resolver( );
exit( 0 );
}
- else
- {
- /* Error! */
- free( s );
- Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
- return NULL;
- }
+
+ Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
+
+out: /* Error! */
+ close( s->pipe[0] );
+ free( s );
+ return NULL;
} /* Resolve_Name */
#ifdef IDENTAUTH
-LOCAL void
+static void
Do_ResolveAddr( struct sockaddr_in *Addr, int Sock, int w_fd )
#else
-LOCAL void
+static void
Do_ResolveAddr( struct sockaddr_in *Addr, int w_fd )
#endif
{
* pipe to parent. */
char hostname[HOST_LEN];
+ char ipstr[HOST_LEN];
struct hostent *h;
size_t len;
+ struct in_addr *addr;
+ char *ntoaptr;
#ifdef IDENTAUTH
char *res;
#endif
/* Resolve IP address */
+#ifdef DEBUG
Log_Resolver( LOG_DEBUG, "Now resolving %s ...", inet_ntoa( Addr->sin_addr ));
+#endif
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);
+ ntoaptr = inet_ntoa( Addr->sin_addr );
+ Log(LOG_WARNING,"Possible forgery: %s resolved to %s (which is at ip %s!)",
+ ntoaptr, hostname, ipstr);
+ strlcpy( hostname, ntoaptr, sizeof hostname);
+ }
+ } else {
+ ntoaptr = inet_ntoa( Addr->sin_addr );
+ Log(LOG_WARNING, "Possible forgery: %s resolved to %s (which has no ip address)",
+ ntoaptr, hostname);
+ strlcpy( hostname, ntoaptr, sizeof hostname);
+ }
}
Log_Resolver( LOG_DEBUG, "Ok, translated %s to \"%s\".", inet_ntoa( Addr->sin_addr ), hostname );
} /* Do_ResolveAddr */
-LOCAL void
+static void
Do_ResolveName( char *Host, int w_fd )
{
/* Resolver sub-process: resolve name and write result into pipe
#ifdef h_errno
-LOCAL char *
+static char *
Get_Error( int H_Error )
{
/* Get error message for H_Error */
#endif
-LOCAL RES_STAT *
+static RES_STAT *
New_Res_Stat( void )
{
RES_STAT *s;
}
s->stage = 0;
- s->bufpos = 0;
+ array_init(&s->buffer);
s->pid = -1;
return s;
projects / ngircd-alex.git / blobdiff