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 1.9 2004/05/11 00:01:11 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];
112 Log_Init_Resolver( );
114 Do_ResolveAddr( Addr, Sock, s->pipe[1] );
116 Do_ResolveAddr( Addr, s->pipe[1] );
118 Log_Exit_Resolver( );
125 Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
132 Resolve_Name( CHAR *Host )
134 /* Resolve hostname (asynchronous!). On errors, e.g. if the child
135 * process can't be forked, this functions returns NULL. */
140 /* Allocate memory */
141 s = (RES_STAT *)malloc( sizeof( RES_STAT ));
144 Log( LOG_EMERG, "Resolver: Can't allocate memory! [Resolve_Name]" );
148 /* Initialize the pipe for the result */
149 if( pipe( s->pipe ) != 0 )
152 Log( LOG_ALERT, "Resolver: Can't create output pipe: %s!", strerror( errno ));
156 /* Fork sub-process */
161 Log( LOG_DEBUG, "Resolver for \"%s\" created (PID %d).", Host, pid );
162 FD_SET( s->pipe[0], &Resolver_FDs );
163 if( s->pipe[0] > Conn_MaxFD ) Conn_MaxFD = s->pipe[0];
172 Log_Init_Resolver( );
173 Do_ResolveName( Host, s->pipe[1] );
174 Log_Exit_Resolver( );
181 Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
189 Do_ResolveAddr( struct sockaddr_in *Addr, int Sock, INT w_fd )
192 Do_ResolveAddr( struct sockaddr_in *Addr, INT w_fd )
195 /* Resolver sub-process: resolve IP address and write result into
198 CHAR hostname[HOST_LEN];
205 /* Resolve IP address */
206 Log_Resolver( LOG_DEBUG, "Now resolving %s ...", inet_ntoa( Addr->sin_addr ));
207 h = gethostbyaddr( (CHAR *)&Addr->sin_addr, sizeof( Addr->sin_addr ), AF_INET );
208 if( h ) strlcpy( hostname, h->h_name, sizeof( hostname ));
212 Log_Resolver( LOG_WARNING, "Can't resolve address \"%s\": %s!", inet_ntoa( Addr->sin_addr ), Get_Error( h_errno ));
214 Log_Resolver( LOG_WARNING, "Can't resolve address \"%s\"!", inet_ntoa( Addr->sin_addr ));
216 strlcpy( hostname, inet_ntoa( Addr->sin_addr ), sizeof( hostname ));
218 Log_Resolver( LOG_DEBUG, "Ok, translated %s to \"%s\".", inet_ntoa( Addr->sin_addr ), hostname );
220 /* Write resolver result into pipe to parent */
221 len = strlen( hostname );
222 hostname[len] = '\n'; len++;
223 if( (size_t)write( w_fd, hostname, len ) != (size_t)len )
225 Log_Resolver( LOG_CRIT, "Resolver: Can't write to parent: %s!", strerror( errno ));
231 /* Do "IDENT" (aka "AUTH") lookup and write result to parent */
232 Log_Resolver( LOG_DEBUG, "Doing IDENT lookup on socket %d ...", Sock );
233 res = ident_id( Sock, 10 );
234 Log_Resolver( LOG_DEBUG, "Ok, IDENT lookup on socket %d done: \"%s\"", Sock, res ? res : "" );
236 /* Write IDENT result into pipe to parent */
237 len = strlen( res ? res : "" );
238 if( res != NULL ) res[len] = '\n';
240 if( (size_t)write( w_fd, res ? res : "\n", len ) != (size_t)len )
242 Log_Resolver( LOG_CRIT, "Resolver: Can't write to parent (IDENT): %s!", strerror( errno ));
247 } /* Do_ResolveAddr */
251 Do_ResolveName( CHAR *Host, INT w_fd )
253 /* Resolver sub-process: resolve name and write result into pipe
258 struct in_addr *addr;
261 Log_Resolver( LOG_DEBUG, "Now resolving \"%s\" ...", Host );
263 /* Resolve hostname */
264 h = gethostbyname( Host );
267 addr = (struct in_addr *)h->h_addr;
268 strlcpy( ip, inet_ntoa( *addr ), sizeof( ip ));
273 Log_Resolver( LOG_WARNING, "Can't resolve \"%s\": %s!", Host, Get_Error( h_errno ));
275 Log_Resolver( LOG_WARNING, "Can't resolve \"%s\"!", Host );
279 if( ip[0] ) Log_Resolver( LOG_DEBUG, "Ok, translated \"%s\" to %s.", Host, ip );
281 /* Write result into pipe to parent */
283 ip[len] = '\n'; len++;
284 if( (size_t)write( w_fd, ip, len ) != (size_t)len )
286 Log_Resolver( LOG_CRIT, "Resolver: Can't write to parent: %s!", strerror( errno ));
289 } /* Do_ResolveName */
295 Get_Error( INT H_Error )
297 /* Get error message for H_Error */
302 return "host not found";
304 return "name valid but no IP address defined";
306 return "name server error";
308 return "name server temporary not available";
310 return "unknown error";