2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2003 by Alexander Barton (alex@barton.de)
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 * Please read the file COPYING, README and AUTHORS for more information.
11 * Asynchronous resolver
17 static char UNUSED id[] = "$Id: resolve.c,v 1.8 2004/03/11 22:16:31 alex Exp $";
25 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <arpa/inet.h>
45 LOCAL VOID Do_ResolveAddr PARAMS(( struct sockaddr_in *Addr, INT Sock, INT w_fd ));
47 LOCAL VOID Do_ResolveAddr PARAMS(( struct sockaddr_in *Addr, INT w_fd ));
50 LOCAL VOID Do_ResolveName PARAMS(( CHAR *Host, INT w_fd ));
53 LOCAL CHAR *Get_Error PARAMS(( INT H_Error ));
60 /* Initialize module */
62 FD_ZERO( &Resolver_FDs );
68 Resolve_Addr( struct sockaddr_in *Addr, int Sock )
71 Resolve_Addr( struct sockaddr_in *Addr )
74 /* Resolve IP (asynchronous!). On errors, e.g. if the child process
75 * can't be forked, this functions returns NULL. */
81 s = (RES_STAT *)malloc( sizeof( RES_STAT ));
84 Log( LOG_EMERG, "Resolver: Can't allocate memory! [Resolve_Addr]" );
88 /* Initialize pipe for result */
89 if( pipe( s->pipe ) != 0 )
92 Log( LOG_ALERT, "Resolver: Can't create output pipe: %s!", strerror( errno ));
101 Log( LOG_DEBUG, "Resolver for %s created (PID %d).", inet_ntoa( Addr->sin_addr ), pid );
102 FD_SET( s->pipe[0], &Resolver_FDs );
103 if( s->pipe[0] > Conn_MaxFD ) Conn_MaxFD = s->pipe[0];
110 Log_Init_Resolver( );
112 Do_ResolveAddr( Addr, Sock, s->pipe[1] );
114 Do_ResolveAddr( Addr, s->pipe[1] );
116 Log_Exit_Resolver( );
123 Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
130 Resolve_Name( CHAR *Host )
132 /* Resolve hostname (asynchronous!). On errors, e.g. if the child
133 * process can't be forked, this functions returns NULL. */
138 /* Allocate memory */
139 s = (RES_STAT *)malloc( sizeof( RES_STAT ));
142 Log( LOG_EMERG, "Resolver: Can't allocate memory! [Resolve_Name]" );
146 /* Initialize the pipe for the result */
147 if( pipe( s->pipe ) != 0 )
150 Log( LOG_ALERT, "Resolver: Can't create output pipe: %s!", strerror( errno ));
154 /* Fork sub-process */
159 Log( LOG_DEBUG, "Resolver for \"%s\" created (PID %d).", Host, pid );
160 FD_SET( s->pipe[0], &Resolver_FDs );
161 if( s->pipe[0] > Conn_MaxFD ) Conn_MaxFD = s->pipe[0];
168 Log_Init_Resolver( );
169 Do_ResolveName( Host, s->pipe[1] );
170 Log_Exit_Resolver( );
177 Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
185 Do_ResolveAddr( struct sockaddr_in *Addr, int Sock, INT w_fd )
188 Do_ResolveAddr( struct sockaddr_in *Addr, INT w_fd )
191 /* Resolver sub-process: resolve IP address and write result into
194 CHAR hostname[HOST_LEN];
200 Log_Resolver( LOG_DEBUG, "Now resolving %s ...", inet_ntoa( Addr->sin_addr ));
202 /* Resolve IP address */
203 h = gethostbyaddr( (CHAR *)&Addr->sin_addr, sizeof( Addr->sin_addr ), AF_INET );
204 if( h ) strlcpy( hostname, h->h_name, sizeof( hostname ));
208 Log_Resolver( LOG_WARNING, "Can't resolve address \"%s\": %s!", inet_ntoa( Addr->sin_addr ), Get_Error( h_errno ));
210 Log_Resolver( LOG_WARNING, "Can't resolve address \"%s\"!", inet_ntoa( Addr->sin_addr ));
212 strlcpy( hostname, inet_ntoa( Addr->sin_addr ), sizeof( hostname ));
216 /* Do "IDENT" (aka "AUTH") lookup and write result to parent */
217 Log_Resolver( LOG_DEBUG, "Doing IDENT lookup on socket %d ...", Sock );
218 res = ident_id( Sock, 10 );
219 Log_Resolver( LOG_DEBUG, "IDENT lookup on socket %d done.", Sock );
222 /* Write result into pipe to parent */
223 if( (size_t)write( w_fd, hostname, strlen( hostname ) + 1 ) != (size_t)( strlen( hostname ) + 1 ))
225 Log_Resolver( LOG_CRIT, "Resolver: Can't write to parent: %s!", strerror( errno ));
230 if( (size_t)write( w_fd, res ? res : "", strlen( res ? res : "" ) + 1 ) != (size_t)( strlen( res ? res : "" ) + 1 ))
232 Log_Resolver( LOG_CRIT, "Resolver: Can't write to parent (IDENT): %s!", strerror( errno ));
240 Log_Resolver( LOG_DEBUG, "Ok, translated %s to \"%s\".", inet_ntoa( Addr->sin_addr ), hostname );
241 } /* Do_ResolveAddr */
245 Do_ResolveName( CHAR *Host, INT w_fd )
247 /* Resolver sub-process: resolve name and write result into pipe
252 struct in_addr *addr;
254 Log_Resolver( LOG_DEBUG, "Now resolving \"%s\" ...", Host );
256 /* Resolve hostname */
257 h = gethostbyname( Host );
260 addr = (struct in_addr *)h->h_addr;
261 strlcpy( ip, inet_ntoa( *addr ), sizeof( ip ));
266 Log_Resolver( LOG_WARNING, "Can't resolve \"%s\": %s!", Host, Get_Error( h_errno ));
268 Log_Resolver( LOG_WARNING, "Can't resolve \"%s\"!", Host );
273 /* Write result into pipe to parent */
274 if( (size_t)write( w_fd, ip, strlen( ip ) + 1 ) != (size_t)( strlen( ip ) + 1 ))
276 Log_Resolver( LOG_CRIT, "Resolver: Can't write to parent: %s!", strerror( errno ));
281 if( ip[0] ) Log_Resolver( LOG_DEBUG, "Ok, translated \"%s\" to %s.", Host, ip );
282 } /* Do_ResolveName */
288 Get_Error( INT H_Error )
290 /* Get error message for H_Error */
295 return "host not found";
297 return "name valid but no IP address defined";
299 return "name server error";
301 return "name server temporary not available";
303 return "unknown error";