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Date:: Sun Jun 9 13:19:08 2002 UTC
Message:: - Bessere Logging, wenn malloc() fehl schlaegt.
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  1 46ec0f24 2002-05-27 alex /*
  2 46ec0f24 2002-05-27 alex  * ngIRCd -- The Next Generation IRC Daemon
  3 46ec0f24 2002-05-27 alex  * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
  4 46ec0f24 2002-05-27 alex  *
  5 46ec0f24 2002-05-27 alex  * Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
  6 46ec0f24 2002-05-27 alex  * der GNU General Public License (GPL), wie von der Free Software Foundation
  7 46ec0f24 2002-05-27 alex  * herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
  8 46ec0f24 2002-05-27 alex  * der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
  9 46ec0f24 2002-05-27 alex  * Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
 10 46ec0f24 2002-05-27 alex  * der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
 11 46ec0f24 2002-05-27 alex  *
 12 63c36773 2002-06-09 alex  * $Id: resolve.c,v 1.3 2002/06/09 13:19:08 alex Exp $
 13 46ec0f24 2002-05-27 alex  *
 14 46ec0f24 2002-05-27 alex  * resolve.c: asyncroner Resolver
 15 46ec0f24 2002-05-27 alex  */
 16 46ec0f24 2002-05-27 alex 
 17 46ec0f24 2002-05-27 alex 
 18 46ec0f24 2002-05-27 alex #include "portab.h"
 19 46ec0f24 2002-05-27 alex 
 20 46ec0f24 2002-05-27 alex #include "imp.h"
 21 46ec0f24 2002-05-27 alex #include <assert.h>
 22 46ec0f24 2002-05-27 alex #include <errno.h>
 23 46ec0f24 2002-05-27 alex #include <stdlib.h>
 24 46ec0f24 2002-05-27 alex #include <string.h>
 25 46ec0f24 2002-05-27 alex #include <unistd.h>
 26 46ec0f24 2002-05-27 alex #include <sys/socket.h>
 27 46ec0f24 2002-05-27 alex #include <netinet/in.h>
 28 46ec0f24 2002-05-27 alex #include <arpa/inet.h>
 29 46ec0f24 2002-05-27 alex #include <netdb.h>
 30 46ec0f24 2002-05-27 alex 
 31 46ec0f24 2002-05-27 alex #include "conn.h"
 32 46ec0f24 2002-05-27 alex #include "defines.h"
 33 46ec0f24 2002-05-27 alex #include "log.h"
 34 46ec0f24 2002-05-27 alex 
 35 46ec0f24 2002-05-27 alex #include "exp.h"
 36 46ec0f24 2002-05-27 alex #include "resolve.h"
 37 46ec0f24 2002-05-27 alex 
 38 46ec0f24 2002-05-27 alex 
 39 46ec0f24 2002-05-27 alex LOCAL VOID Do_ResolveAddr PARAMS(( struct sockaddr_in *Addr, INT w_fd ));
 40 46ec0f24 2002-05-27 alex LOCAL VOID Do_ResolveName PARAMS(( CHAR *Host, INT w_fd ));
 41 46ec0f24 2002-05-27 alex 
 42 46ec0f24 2002-05-27 alex #ifdef h_errno
 43 f7327524 2002-05-30 alex LOCAL CHAR *Get_Error PARAMS(( INT H_Error ));
 44 46ec0f24 2002-05-27 alex #endif
 45 46ec0f24 2002-05-27 alex 
 46 46ec0f24 2002-05-27 alex 
 47 46ec0f24 2002-05-27 alex GLOBAL VOID
 48 46ec0f24 2002-05-27 alex Resolve_Init( VOID )
 49 46ec0f24 2002-05-27 alex {
 50 46ec0f24 2002-05-27 alex 	/* Modul initialisieren */
 51 46ec0f24 2002-05-27 alex 
 52 46ec0f24 2002-05-27 alex 	FD_ZERO( &Resolver_FDs );
 53 46ec0f24 2002-05-27 alex } /* Resolve_Init */
 54 46ec0f24 2002-05-27 alex 
 55 46ec0f24 2002-05-27 alex 
 56 46ec0f24 2002-05-27 alex GLOBAL RES_STAT *
 57 46ec0f24 2002-05-27 alex Resolve_Addr( struct sockaddr_in *Addr )
 58 46ec0f24 2002-05-27 alex {
 59 46ec0f24 2002-05-27 alex 	/* IP (asyncron!) aufloesen. Bei Fehler, z.B. wenn der
 60 46ec0f24 2002-05-27 alex 	 * Child-Prozess nicht erzeugt werden kann, wird NULL geliefert.
 61 46ec0f24 2002-05-27 alex 	 * Der Host kann dann nicht aufgeloest werden. */
 62 46ec0f24 2002-05-27 alex 
 63 46ec0f24 2002-05-27 alex 	RES_STAT *s;
 64 46ec0f24 2002-05-27 alex 	INT pid;
 65 46ec0f24 2002-05-27 alex 
 66 46ec0f24 2002-05-27 alex 	/* Speicher anfordern */
 67 46ec0f24 2002-05-27 alex 	s = malloc( sizeof( RES_STAT ));
 68 46ec0f24 2002-05-27 alex 	if( ! s )
 69 46ec0f24 2002-05-27 alex 	{
 70 63c36773 2002-06-09 alex 		Log( LOG_EMERG, "Resolver: Can't allocate memory! [Resolve_Addr]" );
 71 46ec0f24 2002-05-27 alex 		return NULL;
 72 46ec0f24 2002-05-27 alex 	}
 73 46ec0f24 2002-05-27 alex 
 74 46ec0f24 2002-05-27 alex 	/* Pipe fuer Antwort initialisieren */
 75 46ec0f24 2002-05-27 alex 	if( pipe( s->pipe ) != 0 )
 76 46ec0f24 2002-05-27 alex 	{
 77 46ec0f24 2002-05-27 alex 		free( s );
 78 46ec0f24 2002-05-27 alex 		Log( LOG_ALERT, "Resolver: Can't create output pipe: %s!", strerror( errno ));
 79 46ec0f24 2002-05-27 alex 		return NULL;
 80 46ec0f24 2002-05-27 alex 	}
 81 46ec0f24 2002-05-27 alex 
 82 46ec0f24 2002-05-27 alex 	/* Sub-Prozess erzeugen */
 83 46ec0f24 2002-05-27 alex 	pid = fork( );
 84 46ec0f24 2002-05-27 alex 	if( pid > 0 )
 85 46ec0f24 2002-05-27 alex 	{
 86 46ec0f24 2002-05-27 alex 		/* Haupt-Prozess */
 87 46ec0f24 2002-05-27 alex 		Log( LOG_DEBUG, "Resolver for %s created (PID %d).", inet_ntoa( Addr->sin_addr ), pid );
 88 46ec0f24 2002-05-27 alex 		FD_SET( s->pipe[0], &Resolver_FDs );
 89 46ec0f24 2002-05-27 alex 		if( s->pipe[0] > Conn_MaxFD ) Conn_MaxFD = s->pipe[0];
 90 46ec0f24 2002-05-27 alex 		s->pid = pid;
 91 46ec0f24 2002-05-27 alex 		return s;
 92 46ec0f24 2002-05-27 alex 	}
 93 46ec0f24 2002-05-27 alex 	else if( pid == 0 )
 94 46ec0f24 2002-05-27 alex 	{
 95 46ec0f24 2002-05-27 alex 		/* Sub-Prozess */
 96 46ec0f24 2002-05-27 alex 		Log_Init_Resolver( );
 97 46ec0f24 2002-05-27 alex 		Do_ResolveAddr( Addr, s->pipe[1] );
 98 46ec0f24 2002-05-27 alex 		Log_Exit_Resolver( );
 99 46ec0f24 2002-05-27 alex 		exit( 0 );
100 46ec0f24 2002-05-27 alex 	}
101 46ec0f24 2002-05-27 alex 	else
102 46ec0f24 2002-05-27 alex 	{
103 46ec0f24 2002-05-27 alex 		/* Fehler */
104 46ec0f24 2002-05-27 alex 		free( s );
105 46ec0f24 2002-05-27 alex 		Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
106 46ec0f24 2002-05-27 alex 		return NULL;
107 46ec0f24 2002-05-27 alex 	}
108 46ec0f24 2002-05-27 alex } /* Resolve_Addr */
109 46ec0f24 2002-05-27 alex 
110 46ec0f24 2002-05-27 alex 
111 46ec0f24 2002-05-27 alex GLOBAL RES_STAT *
112 46ec0f24 2002-05-27 alex Resolve_Name( CHAR *Host )
113 46ec0f24 2002-05-27 alex {
114 46ec0f24 2002-05-27 alex 	/* Hostnamen (asyncron!) aufloesen. Bei Fehler, z.B. wenn der
115 46ec0f24 2002-05-27 alex 	 * Child-Prozess nicht erzeugt werden kann, wird NULL geliefert.
116 46ec0f24 2002-05-27 alex 	 * Der Host kann dann nicht aufgeloest werden. */
117 46ec0f24 2002-05-27 alex 
118 46ec0f24 2002-05-27 alex 	RES_STAT *s;
119 46ec0f24 2002-05-27 alex 	INT pid;
120 46ec0f24 2002-05-27 alex 
121 46ec0f24 2002-05-27 alex 	/* Speicher anfordern */
122 46ec0f24 2002-05-27 alex 	s = malloc( sizeof( RES_STAT ));
123 46ec0f24 2002-05-27 alex 	if( ! s )
124 46ec0f24 2002-05-27 alex 	{
125 63c36773 2002-06-09 alex 		Log( LOG_EMERG, "Resolver: Can't allocate memory! [Resolve_Name]" );
126 46ec0f24 2002-05-27 alex 		return NULL;
127 46ec0f24 2002-05-27 alex 	}
128 46ec0f24 2002-05-27 alex 
129 46ec0f24 2002-05-27 alex 	/* Pipe fuer Antwort initialisieren */
130 46ec0f24 2002-05-27 alex 	if( pipe( s->pipe ) != 0 )
131 46ec0f24 2002-05-27 alex 	{
132 46ec0f24 2002-05-27 alex 		free( s );
133 46ec0f24 2002-05-27 alex 		Log( LOG_ALERT, "Resolver: Can't create output pipe: %s!", strerror( errno ));
134 46ec0f24 2002-05-27 alex 		return NULL;
135 46ec0f24 2002-05-27 alex 	}
136 46ec0f24 2002-05-27 alex 
137 46ec0f24 2002-05-27 alex 	/* Sub-Prozess erzeugen */
138 46ec0f24 2002-05-27 alex 	pid = fork( );
139 46ec0f24 2002-05-27 alex 	if( pid > 0 )
140 46ec0f24 2002-05-27 alex 	{
141 46ec0f24 2002-05-27 alex 		/* Haupt-Prozess */
142 46ec0f24 2002-05-27 alex 		Log( LOG_DEBUG, "Resolver for \"%s\" created (PID %d).", Host, pid );
143 46ec0f24 2002-05-27 alex 		FD_SET( s->pipe[0], &Resolver_FDs );
144 46ec0f24 2002-05-27 alex 		if( s->pipe[0] > Conn_MaxFD ) Conn_MaxFD = s->pipe[0];
145 46ec0f24 2002-05-27 alex 		s->pid = pid;
146 46ec0f24 2002-05-27 alex 		return s;
147 46ec0f24 2002-05-27 alex 	}
148 46ec0f24 2002-05-27 alex 	else if( pid == 0 )
149 46ec0f24 2002-05-27 alex 	{
150 46ec0f24 2002-05-27 alex 		/* Sub-Prozess */
151 46ec0f24 2002-05-27 alex 		Log_Init_Resolver( );
152 46ec0f24 2002-05-27 alex 		Do_ResolveName( Host, s->pipe[1] );
153 46ec0f24 2002-05-27 alex 		Log_Exit_Resolver( );
154 46ec0f24 2002-05-27 alex 		exit( 0 );
155 46ec0f24 2002-05-27 alex 	}
156 46ec0f24 2002-05-27 alex 	else
157 46ec0f24 2002-05-27 alex 	{
158 46ec0f24 2002-05-27 alex 		/* Fehler */
159 46ec0f24 2002-05-27 alex 		free( s );
160 46ec0f24 2002-05-27 alex 		Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
161 46ec0f24 2002-05-27 alex 		return NULL;
162 46ec0f24 2002-05-27 alex 	}
163 46ec0f24 2002-05-27 alex } /* Resolve_Name */
164 46ec0f24 2002-05-27 alex 
165 46ec0f24 2002-05-27 alex 
166 46ec0f24 2002-05-27 alex LOCAL VOID
167 46ec0f24 2002-05-27 alex Do_ResolveAddr( struct sockaddr_in *Addr, INT w_fd )
168 46ec0f24 2002-05-27 alex {
169 46ec0f24 2002-05-27 alex 	/* Resolver Sub-Prozess: IP aufloesen und Ergebnis in Pipe schreiben. */
170 46ec0f24 2002-05-27 alex 
171 46ec0f24 2002-05-27 alex 	CHAR hostname[HOST_LEN];
172 46ec0f24 2002-05-27 alex 	struct hostent *h;
173 46ec0f24 2002-05-27 alex 
174 46ec0f24 2002-05-27 alex 	Log_Resolver( LOG_DEBUG, "Now resolving %s ...", inet_ntoa( Addr->sin_addr ));
175 46ec0f24 2002-05-27 alex 
176 46ec0f24 2002-05-27 alex 	/* Namen aufloesen */
177 46ec0f24 2002-05-27 alex 	h = gethostbyaddr( (CHAR *)&Addr->sin_addr, sizeof( Addr->sin_addr ), AF_INET );
178 46ec0f24 2002-05-27 alex 	if( h ) strcpy( hostname, h->h_name );
179 46ec0f24 2002-05-27 alex 	else
180 46ec0f24 2002-05-27 alex 	{
181 46ec0f24 2002-05-27 alex #ifdef h_errno
182 46ec0f24 2002-05-27 alex 		Log_Resolver( LOG_WARNING, "Can't resolve address \"%s\": %s!", inet_ntoa( Addr->sin_addr ), Get_Error( h_errno ));
183 46ec0f24 2002-05-27 alex #else
184 46ec0f24 2002-05-27 alex 		Log_Resolver( LOG_WARNING, "Can't resolve address \"%s\"!", inet_ntoa( Addr->sin_addr ));
185 46ec0f24 2002-05-27 alex #endif	
186 46ec0f24 2002-05-27 alex 		strcpy( hostname, inet_ntoa( Addr->sin_addr ));
187 46ec0f24 2002-05-27 alex 	}
188 46ec0f24 2002-05-27 alex 
189 46ec0f24 2002-05-27 alex 	/* Antwort an Parent schreiben */
190 46ec0f24 2002-05-27 alex 	if( write( w_fd, hostname, strlen( hostname ) + 1 ) != ( strlen( hostname ) + 1 ))
191 46ec0f24 2002-05-27 alex 	{
192 46ec0f24 2002-05-27 alex 		Log_Resolver( LOG_CRIT, "Resolver: Can't write to parent: %s!", strerror( errno ));
193 46ec0f24 2002-05-27 alex 		close( w_fd );
194 46ec0f24 2002-05-27 alex 		return;
195 46ec0f24 2002-05-27 alex 	}
196 46ec0f24 2002-05-27 alex 
197 46ec0f24 2002-05-27 alex 	Log_Resolver( LOG_DEBUG, "Ok, translated %s to \"%s\".", inet_ntoa( Addr->sin_addr ), hostname );
198 46ec0f24 2002-05-27 alex } /* Do_ResolveAddr */
199 46ec0f24 2002-05-27 alex 
200 46ec0f24 2002-05-27 alex 
201 46ec0f24 2002-05-27 alex LOCAL VOID
202 46ec0f24 2002-05-27 alex Do_ResolveName( CHAR *Host, INT w_fd )
203 46ec0f24 2002-05-27 alex {
204 46ec0f24 2002-05-27 alex 	/* Resolver Sub-Prozess: Name aufloesen und Ergebnis in Pipe schreiben. */
205 46ec0f24 2002-05-27 alex 
206 46ec0f24 2002-05-27 alex 	CHAR ip[16];
207 46ec0f24 2002-05-27 alex 	struct hostent *h;
208 46ec0f24 2002-05-27 alex 	struct in_addr *addr;
209 46ec0f24 2002-05-27 alex 
210 46ec0f24 2002-05-27 alex 	Log_Resolver( LOG_DEBUG, "Now resolving \"%s\" ...", Host );
211 46ec0f24 2002-05-27 alex 
212 46ec0f24 2002-05-27 alex 	/* Namen aufloesen */
213 46ec0f24 2002-05-27 alex 	h = gethostbyname( Host );
214 46ec0f24 2002-05-27 alex 	if( h )
215 46ec0f24 2002-05-27 alex 	{
216 46ec0f24 2002-05-27 alex 		addr = (struct in_addr *)h->h_addr;
217 46ec0f24 2002-05-27 alex 		strcpy( ip, inet_ntoa( *addr ));
218 46ec0f24 2002-05-27 alex 	}
219 46ec0f24 2002-05-27 alex 	else
220 46ec0f24 2002-05-27 alex 	{
221 46ec0f24 2002-05-27 alex #ifdef h_errno
222 46ec0f24 2002-05-27 alex 		Log_Resolver( LOG_WARNING, "Can't resolve \"%s\": %s!", Host, Get_Error( h_errno ));
223 46ec0f24 2002-05-27 alex #else
224 46ec0f24 2002-05-27 alex 		Log_Resolver( LOG_WARNING, "Can't resolve \"%s\"!", Host );
225 46ec0f24 2002-05-27 alex #endif
226 46ec0f24 2002-05-27 alex 		strcpy( ip, "" );
227 46ec0f24 2002-05-27 alex 	}
228 46ec0f24 2002-05-27 alex 
229 46ec0f24 2002-05-27 alex 	/* Antwort an Parent schreiben */
230 46ec0f24 2002-05-27 alex 	if( write( w_fd, ip, strlen( ip ) + 1 ) != ( strlen( ip ) + 1 ))
231 46ec0f24 2002-05-27 alex 	{
232 46ec0f24 2002-05-27 alex 		Log_Resolver( LOG_CRIT, "Resolver: Can't write to parent: %s!", strerror( errno ));
233 46ec0f24 2002-05-27 alex 		close( w_fd );
234 46ec0f24 2002-05-27 alex 		return;
235 46ec0f24 2002-05-27 alex 	}
236 46ec0f24 2002-05-27 alex 
237 46ec0f24 2002-05-27 alex 	if( ip[0] ) Log_Resolver( LOG_DEBUG, "Ok, translated \"%s\" to %s.", Host, ip );
238 46ec0f24 2002-05-27 alex } /* Do_ResolveName */
239 46ec0f24 2002-05-27 alex 
240 46ec0f24 2002-05-27 alex 
241 46ec0f24 2002-05-27 alex #ifdef h_errno
242 46ec0f24 2002-05-27 alex 
243 46ec0f24 2002-05-27 alex LOCAL CHAR *
244 46ec0f24 2002-05-27 alex Get_Error( INT H_Error )
245 46ec0f24 2002-05-27 alex {
246 46ec0f24 2002-05-27 alex 	/* Fehlerbeschreibung fuer H_Error liefern */
247 46ec0f24 2002-05-27 alex 
248 46ec0f24 2002-05-27 alex 	switch( H_Error )
249 46ec0f24 2002-05-27 alex 	{
250 46ec0f24 2002-05-27 alex 		case HOST_NOT_FOUND:
251 46ec0f24 2002-05-27 alex 			return "host not found";
252 46ec0f24 2002-05-27 alex 		case NO_DATA:
253 46ec0f24 2002-05-27 alex 			return "name valid but no IP address defined";
254 46ec0f24 2002-05-27 alex 		case NO_RECOVERY:
255 46ec0f24 2002-05-27 alex 			return "name server error";
256 46ec0f24 2002-05-27 alex 		case TRY_AGAIN:
257 46ec0f24 2002-05-27 alex 			return "name server temporary not available";
258 46ec0f24 2002-05-27 alex 		default:
259 46ec0f24 2002-05-27 alex 			return "unknown error";
260 46ec0f24 2002-05-27 alex 	}
261 46ec0f24 2002-05-27 alex } /* Get_Error */
262 46ec0f24 2002-05-27 alex 
263 46ec0f24 2002-05-27 alex #endif
264 46ec0f24 2002-05-27 alex 
265 46ec0f24 2002-05-27 alex 
266 46ec0f24 2002-05-27 alex /* -eof- */