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1 /*
2  * ngIRCd -- The Next Generation IRC Daemon
3  * Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors.
4  *
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.
10  */
11
12 #include "portab.h"
13
14 /**
15  * @file
16  * Configuration management (reading, parsing & validation)
17  */
18
19 #include <assert.h>
20 #include <ctype.h>
21 #include <errno.h>
22 #ifdef PROTOTYPES
23 #       include <stdarg.h>
24 #else
25 #       include <varargs.h>
26 #endif
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <strings.h>
31 #include <unistd.h>
32 #include <pwd.h>
33 #include <grp.h>
34 #include <sys/types.h>
35 #include <unistd.h>
36 #include <dirent.h>
37
38 #include "array.h"
39 #include "ngircd.h"
40 #include "conn.h"
41 #include "channel.h"
42 #include "defines.h"
43 #include "log.h"
44 #include "match.h"
45 #include "tool.h"
46
47 #include "conf.h"
48
49
50 static bool Use_Log = true, Using_MotdFile = true;
51 static CONF_SERVER New_Server;
52 static int New_Server_Idx;
53
54 static char Conf_MotdFile[FNAME_LEN];
55 static char Conf_HelpFile[FNAME_LEN];
56 static char Conf_IncludeDir[FNAME_LEN];
57
58 static void Set_Defaults PARAMS(( bool InitServers ));
59 static bool Read_Config PARAMS(( bool TestOnly, bool IsStarting ));
60 static void Read_Config_File PARAMS(( const char *File, FILE *fd ));
61 static bool Validate_Config PARAMS(( bool TestOnly, bool Rehash ));
62
63 static void Handle_GLOBAL PARAMS((const char *File, int Line,
64                                   char *Var, char *Arg ));
65 static void Handle_LIMITS PARAMS((const char *File, int Line,
66                                   char *Var, char *Arg ));
67 static void Handle_OPTIONS PARAMS((const char *File, int Line,
68                                    char *Var, char *Arg ));
69 static void Handle_OPERATOR PARAMS((const char *File, int Line,
70                                     char *Var, char *Arg ));
71 static void Handle_SERVER PARAMS((const char *File, int Line,
72                                   char *Var, char *Arg ));
73 static void Handle_CHANNEL PARAMS((const char *File, int Line,
74                                    char *Var, char *Arg ));
75
76 static void Config_Error PARAMS((const int Level, const char *Format, ...));
77
78 static void Config_Error_NaN PARAMS((const char *File, const int LINE,
79                                      const char *Value));
80 static void Config_Error_Section PARAMS((const char *File, const int Line,
81                                          const char *Item, const char *Section));
82 static void Config_Error_TooLong PARAMS((const char *File, const int LINE,
83                                          const char *Value));
84
85 static void Init_Server_Struct PARAMS(( CONF_SERVER *Server ));
86
87
88 #ifdef WANT_IPV6
89 #define DEFAULT_LISTEN_ADDRSTR "::,0.0.0.0"
90 #else
91 #define DEFAULT_LISTEN_ADDRSTR "0.0.0.0"
92 #endif
93
94 #ifdef HAVE_LIBSSL
95 #define DEFAULT_CIPHERS         "HIGH:!aNULL:@STRENGTH"
96 #endif
97 #ifdef HAVE_LIBGNUTLS
98 #define DEFAULT_CIPHERS         "SECURE128"
99 #endif
100
101 #ifdef SSL_SUPPORT
102
103 static void Handle_SSL PARAMS((const char *File, int Line, char *Var, char *Ark));
104
105 struct SSLOptions Conf_SSLOptions;
106
107 /**
108  * Initialize SSL configuration.
109  */
110 static void
111 ConfSSL_Init(void)
112 {
113         free(Conf_SSLOptions.KeyFile);
114         Conf_SSLOptions.KeyFile = NULL;
115
116         free(Conf_SSLOptions.CertFile);
117         Conf_SSLOptions.CertFile = NULL;
118
119         free(Conf_SSLOptions.DHFile);
120         Conf_SSLOptions.DHFile = NULL;
121         array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
122
123         array_free(&Conf_SSLOptions.ListenPorts);
124
125         free(Conf_SSLOptions.CipherList);
126         Conf_SSLOptions.CipherList = NULL;
127 }
128
129 /**
130  * Check if the current configuration uses/requires SSL.
131  *
132  * @returns true if SSL is used and should be initialized.
133  */
134 GLOBAL bool
135 Conf_SSLInUse(void)
136 {
137         int i;
138
139         /* SSL listen ports configured? */
140         if (array_bytes(&Conf_SSLOptions.ListenPorts))
141                 return true;
142
143         for (i = 0; i < MAX_SERVERS; i++) {
144                 if (Conf_Server[i].port > 0
145                     && Conf_Server[i].SSLConnect)
146                         return true;
147         }
148         return false;
149 }
150
151 /**
152  * Make sure that a configured file is readable.
153  *
154  * Currently, this function is only used for SSL-related options ...
155  *
156  * @param Var Configuration variable
157  * @param Filename Configured filename
158  */
159 static void
160 CheckFileReadable(const char *Var, const char *Filename)
161 {
162         FILE *fp;
163
164         if (!Filename)
165                 return;
166
167         fp = fopen(Filename, "r");
168         if (fp)
169                 fclose(fp);
170         else
171                 Config_Error(LOG_ERR, "Can't read \"%s\" (\"%s\"): %s",
172                              Filename, Var, strerror(errno));
173 }
174
175 #endif
176
177
178 /**
179  * Duplicate string and warn on errors.
180  *
181  * @returns Pointer to string on success, NULL otherwise.
182  */
183 static char *
184 strdup_warn(const char *str)
185 {
186         char *ptr = strdup(str);
187         if (!ptr)
188                 Config_Error(LOG_ERR,
189                              "Could not allocate memory for string: %s", str);
190         return ptr;
191 }
192
193 /**
194  * Output a comma separated list of ports (integer values).
195  */
196 static void
197 ports_puts(array *a)
198 {
199         size_t len;
200         UINT16 *ports;
201         len = array_length(a, sizeof(UINT16));
202         if (len--) {
203                 ports = (UINT16*) array_start(a);
204                 printf("%u", (unsigned int) *ports);
205                 while (len--) {
206                         ports++;
207                         printf(", %u", (unsigned int) *ports);
208                 }
209         }
210         putc('\n', stdout);
211 }
212
213 /**
214  * Parse a comma separated string into an array of port numbers (integers).
215  */
216 static void
217 ports_parse(array *a, const char *File, int Line, char *Arg)
218 {
219         char *ptr;
220         int port;
221         UINT16 port16;
222
223         array_trunc(a);
224
225         ptr = strtok( Arg, "," );
226         while (ptr) {
227                 ngt_TrimStr(ptr);
228                 port = atoi(ptr);
229                 if (port > 0 && port < 0xFFFF) {
230                         port16 = (UINT16) port;
231                         if (!array_catb(a, (char*)&port16, sizeof port16))
232                                 Config_Error(LOG_ERR, "%s, line %d Could not add port number %ld: %s",
233                                              File, Line, port, strerror(errno));
234                 } else {
235                         Config_Error( LOG_ERR, "%s, line %d (section \"Global\"): Illegal port number %ld!",
236                                      File, Line, port );
237                 }
238
239                 ptr = strtok( NULL, "," );
240         }
241 }
242
243 /**
244  * Initialize configuration module.
245  */
246 GLOBAL void
247 Conf_Init( void )
248 {
249         Read_Config(false, true);
250         Validate_Config(false, false);
251 }
252
253 /**
254  * "Rehash" (reload) server configuration.
255  *
256  * @returns true if configuration has been re-read, false on errors.
257  */
258 GLOBAL bool
259 Conf_Rehash( void )
260 {
261         if (!Read_Config(false, false))
262                 return false;
263         Validate_Config(false, true);
264
265         /* Update CLIENT structure of local server */
266         Client_SetInfo(Client_ThisServer(), Conf_ServerInfo);
267         return true;
268 }
269
270 /**
271  * Output a boolean value as "yes/no" string.
272  */
273 static const char*
274 yesno_to_str(int boolean_value)
275 {
276         if (boolean_value)
277                 return "yes";
278         return "no";
279 }
280
281 /**
282  * Free all IRC operator configuration structures.
283  */
284 static void
285 opers_free(void)
286 {
287         struct Conf_Oper *op;
288         size_t len;
289
290         len = array_length(&Conf_Opers, sizeof(*op));
291         op = array_start(&Conf_Opers);
292         while (len--) {
293                 free(op->mask);
294                 op++;
295         }
296         array_free(&Conf_Opers);
297 }
298
299 /**
300  * Output all IRC operator configuration structures.
301  */
302 static void
303 opers_puts(void)
304 {
305         struct Conf_Oper *op;
306         size_t count, i;
307
308         count = array_length(&Conf_Opers, sizeof(*op));
309         op = array_start(&Conf_Opers);
310         for (i = 0; i < count; i++, op++) {
311                 if (!op->name[0])
312                         continue;
313
314                 puts("[OPERATOR]");
315                 printf("  Name = %s\n", op->name);
316                 printf("  Password = %s\n", op->pwd);
317                 printf("  Mask = %s\n\n", op->mask ? op->mask : "");
318         }
319 }
320
321 /**
322  * Read configuration, validate and output it.
323  *
324  * This function waits for a keypress of the user when stdin/stdout are valid
325  * tty's ("you can read our nice message and we can read in your keypress").
326  *
327  * @return      0 on success, 1 on failure(s); therefore the result code can
328  *              directly be used by exit() when running "ngircd --configtest".
329  */
330 GLOBAL int
331 Conf_Test( void )
332 {
333         struct passwd *pwd;
334         struct group *grp;
335         unsigned int i;
336         bool config_valid;
337         size_t predef_channel_count;
338         struct Conf_Channel *predef_chan;
339
340         Use_Log = false;
341
342         if (!Read_Config(true, true))
343                 return 1;
344
345         config_valid = Validate_Config(true, false);
346
347         /* Valid tty? */
348         if(isatty(fileno(stdin)) && isatty(fileno(stdout))) {
349                 puts("OK, press enter to see a dump of your server configuration ...");
350                 getchar();
351         } else
352                 puts("Ok, dump of your server configuration follows:\n");
353
354         puts("[GLOBAL]");
355         printf("  Name = %s\n", Conf_ServerName);
356         printf("  AdminInfo1 = %s\n", Conf_ServerAdmin1);
357         printf("  AdminInfo2 = %s\n", Conf_ServerAdmin2);
358         printf("  AdminEMail = %s\n", Conf_ServerAdminMail);
359         printf("  HelpFile = %s\n", Conf_HelpFile);
360         printf("  Info = %s\n", Conf_ServerInfo);
361         printf("  Listen = %s\n", Conf_ListenAddress);
362         if (Using_MotdFile) {
363                 printf("  MotdFile = %s\n", Conf_MotdFile);
364                 printf("  MotdPhrase =\n");
365         } else {
366                 printf("  MotdFile = \n");
367                 printf("  MotdPhrase = %s\n", array_bytes(&Conf_Motd)
368                        ? (const char*) array_start(&Conf_Motd) : "");
369         }
370         printf("  Network = %s\n", Conf_Network);
371         if (!Conf_PAM) 
372                 printf("  Password = %s\n", Conf_ServerPwd);
373         printf("  PidFile = %s\n", Conf_PidFile);
374         printf("  Ports = ");
375         ports_puts(&Conf_ListenPorts);
376         grp = getgrgid(Conf_GID);
377         if (grp)
378                 printf("  ServerGID = %s\n", grp->gr_name);
379         else
380                 printf("  ServerGID = %ld\n", (long)Conf_GID);
381         pwd = getpwuid(Conf_UID);
382         if (pwd)
383                 printf("  ServerUID = %s\n", pwd->pw_name);
384         else
385                 printf("  ServerUID = %ld\n", (long)Conf_UID);
386         puts("");
387
388         puts("[LIMITS]");
389         printf("  ConnectRetry = %d\n", Conf_ConnectRetry);
390         printf("  IdleTimeout = %d\n", Conf_IdleTimeout);
391         printf("  MaxConnections = %d\n", Conf_MaxConnections);
392         printf("  MaxConnectionsIP = %d\n", Conf_MaxConnectionsIP);
393         printf("  MaxJoins = %d\n", Conf_MaxJoins > 0 ? Conf_MaxJoins : -1);
394         printf("  MaxNickLength = %u\n", Conf_MaxNickLength - 1);
395         printf("  MaxListSize = %d\n", Conf_MaxListSize);
396         printf("  PingTimeout = %d\n", Conf_PingTimeout);
397         printf("  PongTimeout = %d\n", Conf_PongTimeout);
398         puts("");
399
400         puts("[OPTIONS]");
401         printf("  AllowedChannelTypes = %s\n", Conf_AllowedChannelTypes);
402         printf("  AllowRemoteOper = %s\n", yesno_to_str(Conf_AllowRemoteOper));
403         printf("  ChrootDir = %s\n", Conf_Chroot);
404         printf("  CloakHost = %s\n", Conf_CloakHost);
405         printf("  CloakHostModeX = %s\n", Conf_CloakHostModeX);
406         printf("  CloakHostSalt = %s\n", Conf_CloakHostSalt);
407         printf("  CloakUserToNick = %s\n", yesno_to_str(Conf_CloakUserToNick));
408 #ifdef WANT_IPV6
409         printf("  ConnectIPv4 = %s\n", yesno_to_str(Conf_ConnectIPv6));
410         printf("  ConnectIPv6 = %s\n", yesno_to_str(Conf_ConnectIPv4));
411 #endif
412         printf("  DefaultUserModes = %s\n", Conf_DefaultUserModes);
413         printf("  DNS = %s\n", yesno_to_str(Conf_DNS));
414 #ifdef IDENT
415         printf("  Ident = %s\n", yesno_to_str(Conf_Ident));
416 #endif
417         printf("  IncludeDir = %s\n", Conf_IncludeDir);
418         printf("  MorePrivacy = %s\n", yesno_to_str(Conf_MorePrivacy));
419         printf("  NoticeAuth = %s\n", yesno_to_str(Conf_NoticeAuth));
420         printf("  OperCanUseMode = %s\n", yesno_to_str(Conf_OperCanMode));
421         printf("  OperChanPAutoOp = %s\n", yesno_to_str(Conf_OperChanPAutoOp));
422         printf("  OperServerMode = %s\n", yesno_to_str(Conf_OperServerMode));
423 #ifdef PAM
424         printf("  PAM = %s\n", yesno_to_str(Conf_PAM));
425         printf("  PAMIsOptional = %s\n", yesno_to_str(Conf_PAMIsOptional));
426 #endif
427 #ifndef STRICT_RFC
428         printf("  RequireAuthPing = %s\n", yesno_to_str(Conf_AuthPing));
429 #endif
430         printf("  ScrubCTCP = %s\n", yesno_to_str(Conf_ScrubCTCP));
431 #ifdef SYSLOG
432         printf("  SyslogFacility = %s\n",
433                ngt_SyslogFacilityName(Conf_SyslogFacility));
434 #endif
435         printf("  WebircPassword = %s\n", Conf_WebircPwd);
436         puts("");
437
438 #ifdef SSL_SUPPORT
439         puts("[SSL]");
440         printf("  CertFile = %s\n", Conf_SSLOptions.CertFile
441                                         ? Conf_SSLOptions.CertFile : "");
442         printf("  CipherList = %s\n", Conf_SSLOptions.CipherList ?
443                Conf_SSLOptions.CipherList : DEFAULT_CIPHERS);
444         printf("  DHFile = %s\n", Conf_SSLOptions.DHFile
445                                         ? Conf_SSLOptions.DHFile : "");
446         printf("  KeyFile = %s\n", Conf_SSLOptions.KeyFile
447                                         ? Conf_SSLOptions.KeyFile : "");
448         if (array_bytes(&Conf_SSLOptions.KeyFilePassword))
449                 puts("  KeyFilePassword = <secret>");
450         else
451                 puts("  KeyFilePassword = ");
452         array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
453         printf("  Ports = ");
454         ports_puts(&Conf_SSLOptions.ListenPorts);
455         puts("");
456 #endif
457
458         opers_puts();
459
460         for( i = 0; i < MAX_SERVERS; i++ ) {
461                 if( ! Conf_Server[i].name[0] ) continue;
462
463                 /* Valid "Server" section */
464                 puts( "[SERVER]" );
465                 printf( "  Name = %s\n", Conf_Server[i].name );
466                 printf( "  Host = %s\n", Conf_Server[i].host );
467                 printf( "  Port = %u\n", (unsigned int)Conf_Server[i].port );
468 #ifdef SSL_SUPPORT
469                 printf( "  SSLConnect = %s\n", Conf_Server[i].SSLConnect?"yes":"no");
470 #endif
471                 printf( "  MyPassword = %s\n", Conf_Server[i].pwd_in );
472                 printf( "  PeerPassword = %s\n", Conf_Server[i].pwd_out );
473                 printf( "  ServiceMask = %s\n", Conf_Server[i].svs_mask);
474                 printf( "  Group = %d\n", Conf_Server[i].group );
475                 printf( "  Passive = %s\n\n", Conf_Server[i].flags & CONF_SFLAG_DISABLED ? "yes" : "no");
476         }
477
478         predef_channel_count = array_length(&Conf_Channels, sizeof(*predef_chan));
479         predef_chan = array_start(&Conf_Channels);
480
481         for (i = 0; i < predef_channel_count; i++, predef_chan++) {
482                 if (!predef_chan->name[0])
483                         continue;
484
485                 /* Valid "Channel" section */
486                 puts( "[CHANNEL]" );
487                 printf("  Name = %s\n", predef_chan->name);
488                 printf("  Modes = %s\n", predef_chan->modes);
489                 printf("  Key = %s\n", predef_chan->key);
490                 printf("  MaxUsers = %lu\n", predef_chan->maxusers);
491                 printf("  Topic = %s\n", predef_chan->topic);
492                 printf("  KeyFile = %s\n\n", predef_chan->keyfile);
493         }
494
495         return (config_valid ? 0 : 1);
496 }
497
498 /**
499  * Remove connection information from configured server.
500  *
501  * If the server is set as "once", delete it from our configuration;
502  * otherwise set the time for the next connection attempt.
503  *
504  * Non-server connections will be silently ignored.
505  */
506 GLOBAL void
507 Conf_UnsetServer( CONN_ID Idx )
508 {
509         int i;
510         time_t t;
511
512         /* Check all our configured servers */
513         for( i = 0; i < MAX_SERVERS; i++ ) {
514                 if( Conf_Server[i].conn_id != Idx ) continue;
515
516                 /* Gotcha! Mark server configuration as "unused": */
517                 Conf_Server[i].conn_id = NONE;
518
519                 if( Conf_Server[i].flags & CONF_SFLAG_ONCE ) {
520                         /* Delete configuration here */
521                         Init_Server_Struct( &Conf_Server[i] );
522                 } else {
523                         /* Set time for next connect attempt */
524                         t = time(NULL);
525                         if (Conf_Server[i].lasttry < t - Conf_ConnectRetry) {
526                                 /* The connection has been "long", so we don't
527                                  * require the next attempt to be delayed. */
528                                 Conf_Server[i].lasttry =
529                                         t - Conf_ConnectRetry + RECONNECT_DELAY;
530                         } else {
531                                 /* "Short" connection, enforce "ConnectRetry"
532                                  * but randomize it a little bit: 15 seconds. */
533                                 Conf_Server[i].lasttry =
534 #ifdef HAVE_ARC4RANDOM
535                                         t + (arc4random() % 15);
536 #else
537                                         t + rand() / (RAND_MAX / 15);
538 #endif
539                         }
540                 }
541         }
542 }
543
544 /**
545  * Set connection information for specified configured server.
546  */
547 GLOBAL bool
548 Conf_SetServer( int ConfServer, CONN_ID Idx )
549 {
550         assert( ConfServer > NONE );
551         assert( Idx > NONE );
552
553         if (Conf_Server[ConfServer].conn_id > NONE &&
554             Conf_Server[ConfServer].conn_id != Idx) {
555                 Log(LOG_ERR,
556                     "Connection %d: Server configuration of \"%s\" already in use by connection %d!",
557                     Idx, Conf_Server[ConfServer].name,
558                     Conf_Server[ConfServer].conn_id);
559                 Conn_Close(Idx, NULL, "Server configuration already in use", true);
560                 return false;
561         }
562         Conf_Server[ConfServer].conn_id = Idx;
563         return true;
564 }
565
566 /**
567  * Get index of server in configuration structure.
568  */
569 GLOBAL int
570 Conf_GetServer( CONN_ID Idx )
571 {
572         int i = 0;
573
574         assert( Idx > NONE );
575
576         for( i = 0; i < MAX_SERVERS; i++ ) {
577                 if( Conf_Server[i].conn_id == Idx ) return i;
578         }
579         return NONE;
580 }
581
582 /**
583  * Enable a server by name and adjust its port number.
584  *
585  * @returns     true if a server has been enabled and now has a valid port
586  *              number and host name for outgoing connections.
587  */
588 GLOBAL bool
589 Conf_EnableServer( const char *Name, UINT16 Port )
590 {
591         int i;
592
593         assert( Name != NULL );
594         for( i = 0; i < MAX_SERVERS; i++ ) {
595                 if( strcasecmp( Conf_Server[i].name, Name ) == 0 ) {
596                         /* Gotcha! Set port and enable server: */
597                         Conf_Server[i].port = Port;
598                         Conf_Server[i].flags &= ~CONF_SFLAG_DISABLED;
599                         return (Conf_Server[i].port && Conf_Server[i].host[0]);
600                 }
601         }
602         return false;
603 }
604
605 /**
606  * Enable a server by name.
607  *
608  * The server is only usable as outgoing server, if it has set a valid port
609  * number for outgoing connections!
610  * If not, you have to use Conf_EnableServer() function to make it available.
611  *
612  * @returns     true if a server has been enabled; false otherwise.
613  */
614 GLOBAL bool
615 Conf_EnablePassiveServer(const char *Name)
616 {
617         int i;
618
619         assert( Name != NULL );
620         for (i = 0; i < MAX_SERVERS; i++) {
621                 if ((strcasecmp( Conf_Server[i].name, Name ) == 0)
622                     && (Conf_Server[i].port > 0)) {
623                         /* BINGO! Enable server */
624                         Conf_Server[i].flags &= ~CONF_SFLAG_DISABLED;
625                         return true;
626                 }
627         }
628         return false;
629 }
630
631 /**
632  * Disable a server by name.
633  * An already established connection will be disconnected.
634  *
635  * @returns     true if a server was found and has been disabled.
636  */
637 GLOBAL bool
638 Conf_DisableServer( const char *Name )
639 {
640         int i;
641
642         assert( Name != NULL );
643         for( i = 0; i < MAX_SERVERS; i++ ) {
644                 if( strcasecmp( Conf_Server[i].name, Name ) == 0 ) {
645                         /* Gotcha! Disable and disconnect server: */
646                         Conf_Server[i].flags |= CONF_SFLAG_DISABLED;
647                         if( Conf_Server[i].conn_id > NONE )
648                                 Conn_Close(Conf_Server[i].conn_id, NULL,
649                                            "Server link terminated on operator request",
650                                            true);
651                         return true;
652                 }
653         }
654         return false;
655 }
656
657 /**
658  * Add a new remote server to our configuration.
659  *
660  * @param Name          Name of the new server.
661  * @param Port          Port number to connect to or 0 for incoming connections.
662  * @param Host          Host name to connect to.
663  * @param MyPwd         Password that will be sent to the peer.
664  * @param PeerPwd       Password that must be received from the peer.
665  * @returns             true if the new server has been added; false otherwise.
666  */
667 GLOBAL bool
668 Conf_AddServer(const char *Name, UINT16 Port, const char *Host,
669                const char *MyPwd, const char *PeerPwd)
670 {
671         int i;
672
673         assert( Name != NULL );
674         assert( Host != NULL );
675         assert( MyPwd != NULL );
676         assert( PeerPwd != NULL );
677
678         /* Search unused item in server configuration structure */
679         for( i = 0; i < MAX_SERVERS; i++ ) {
680                 /* Is this item used? */
681                 if( ! Conf_Server[i].name[0] ) break;
682         }
683         if( i >= MAX_SERVERS ) return false;
684
685         Init_Server_Struct( &Conf_Server[i] );
686         strlcpy( Conf_Server[i].name, Name, sizeof( Conf_Server[i].name ));
687         strlcpy( Conf_Server[i].host, Host, sizeof( Conf_Server[i].host ));
688         strlcpy( Conf_Server[i].pwd_out, MyPwd, sizeof( Conf_Server[i].pwd_out ));
689         strlcpy( Conf_Server[i].pwd_in, PeerPwd, sizeof( Conf_Server[i].pwd_in ));
690         Conf_Server[i].port = Port;
691         Conf_Server[i].flags = CONF_SFLAG_ONCE;
692
693         return true;
694 }
695
696 /**
697  * Check if the given nickname is reserved for services on a particular server.
698  *
699  * @param ConfServer The server index to check.
700  * @param Nick The nickname to check.
701  * @returns true if the given nickname belongs to an "IRC service".
702  */
703 GLOBAL bool
704 Conf_NickIsService(int ConfServer, const char *Nick)
705 {
706         assert (ConfServer >= 0);
707         assert (ConfServer < MAX_SERVERS);
708
709         return MatchCaseInsensitiveList(Conf_Server[ConfServer].svs_mask,
710                                         Nick, ",");
711 }
712
713 /**
714  * Check if the given nickname is blocked for "normal client" use.
715  *
716  * @param ConfServer The server index or NONE to check all configured servers.
717  * @param Nick The nickname to check.
718  * @returns true if the given nickname belongs to an "IRC service".
719  */
720 GLOBAL bool
721 Conf_NickIsBlocked(const char *Nick)
722 {
723         int i;
724
725         for(i = 0; i < MAX_SERVERS; i++) {
726                 if (!Conf_Server[i].name[0])
727                         continue;
728                 if (Conf_NickIsService(i, Nick))
729                         return true;
730         }
731         return false;
732 }
733
734 /**
735  * Initialize configuration settings with their default values.
736  */
737 static void
738 Set_Defaults(bool InitServers)
739 {
740         int i;
741         char random[RANDOM_SALT_LEN + 1];
742
743         /* Global */
744         strcpy(Conf_ServerName, "");
745         strcpy(Conf_ServerAdmin1, "");
746         strcpy(Conf_ServerAdmin2, "");
747         strcpy(Conf_ServerAdminMail, "");
748         snprintf(Conf_ServerInfo, sizeof Conf_ServerInfo, "%s %s",
749                  PACKAGE_NAME, PACKAGE_VERSION);
750         strcpy(Conf_Network, "");
751         free(Conf_ListenAddress);
752         Conf_ListenAddress = NULL;
753         array_free(&Conf_ListenPorts);
754         array_free(&Conf_Motd);
755         array_free(&Conf_Helptext);
756         strlcpy(Conf_MotdFile, SYSCONFDIR, sizeof(Conf_MotdFile));
757         strlcat(Conf_MotdFile, MOTD_FILE, sizeof(Conf_MotdFile));
758         strlcpy(Conf_HelpFile, DOCDIR, sizeof(Conf_HelpFile));
759         strlcat(Conf_HelpFile, HELP_FILE, sizeof(Conf_HelpFile));
760         strcpy(Conf_ServerPwd, "");
761         strlcpy(Conf_PidFile, PID_FILE, sizeof(Conf_PidFile));
762         Conf_UID = Conf_GID = 0;
763
764         /* Limits */
765         Conf_ConnectRetry = 60;
766         Conf_IdleTimeout = 0;
767         Conf_MaxConnections = 0;
768         Conf_MaxConnectionsIP = 5;
769         Conf_MaxJoins = 10;
770         Conf_MaxNickLength = CLIENT_NICK_LEN_DEFAULT;
771         Conf_MaxListSize = 100;
772         Conf_PingTimeout = 120;
773         Conf_PongTimeout = 20;
774
775         /* Options */
776         strlcpy(Conf_AllowedChannelTypes, CHANTYPES,
777                 sizeof(Conf_AllowedChannelTypes));
778         Conf_AllowRemoteOper = false;
779 #ifndef STRICT_RFC
780         Conf_AuthPing = false;
781 #endif
782         strlcpy(Conf_Chroot, CHROOT_DIR, sizeof(Conf_Chroot));
783         strcpy(Conf_CloakHost, "");
784         strcpy(Conf_CloakHostModeX, "");
785         strlcpy(Conf_CloakHostSalt, ngt_RandomStr(random, RANDOM_SALT_LEN),
786                 sizeof(Conf_CloakHostSalt));
787         Conf_CloakUserToNick = false;
788         Conf_ConnectIPv4 = true;
789 #ifdef WANT_IPV6
790         Conf_ConnectIPv6 = true;
791 #else
792         Conf_ConnectIPv6 = false;
793 #endif
794         strcpy(Conf_DefaultUserModes, "");
795         Conf_DNS = true;
796 #ifdef IDENTAUTH
797         Conf_Ident = true;
798 #else
799         Conf_Ident = false;
800 #endif
801         strcpy(Conf_IncludeDir, "");
802         Conf_MorePrivacy = false;
803         Conf_NoticeAuth = false;
804         Conf_OperCanMode = false;
805         Conf_OperChanPAutoOp = true;
806         Conf_OperServerMode = false;
807 #ifdef PAM
808         Conf_PAM = true;
809 #else
810         Conf_PAM = false;
811 #endif
812         Conf_PAMIsOptional = false;
813 #ifdef SYSLOG
814         Conf_ScrubCTCP = false;
815 #ifdef LOG_LOCAL5
816         Conf_SyslogFacility = LOG_LOCAL5;
817 #else
818         Conf_SyslogFacility = 0;
819 #endif
820 #endif
821
822         /* Initialize server configuration structures */
823         if (InitServers) {
824                 for (i = 0; i < MAX_SERVERS;
825                      Init_Server_Struct(&Conf_Server[i++]));
826         }
827 }
828
829 /**
830  * Get number of configured listening ports.
831  *
832  * @returns The number of ports (IPv4+IPv6) on which the server should listen.
833  */
834 static bool
835 no_listenports(void)
836 {
837         size_t cnt = array_bytes(&Conf_ListenPorts);
838 #ifdef SSL_SUPPORT
839         cnt += array_bytes(&Conf_SSLOptions.ListenPorts);
840 #endif
841         return cnt == 0;
842 }
843
844 /**
845  * Read contents of a text file into an array.
846  *
847  * This function is used to read the MOTD and help text file, for example.
848  *
849  * @param filename      Name of the file to read.
850  * @return              true, when the file has been read in.
851  */
852 static bool
853 Read_TextFile(const char *Filename, const char *Name, array *Destination)
854 {
855         char line[127];
856         FILE *fp;
857         int line_no = 1;
858
859         if (*Filename == '\0')
860                 return false;
861
862         fp = fopen(Filename, "r");
863         if (!fp) {
864                 Config_Error(LOG_ERR, "Can't read %s file \"%s\": %s",
865                              Name, Filename, strerror(errno));
866                 return false;
867         }
868
869         array_free(Destination);
870         while (fgets(line, (int)sizeof line, fp)) {
871                 ngt_TrimLastChr(line, '\n');
872
873                 /* add text including \0 */
874                 if (!array_catb(Destination, line, strlen(line) + 1)) {
875                         Log(LOG_ERR, "Cannot read/add \"%s\", line %d: %s",
876                             Filename, line_no, strerror(errno));
877                         break;
878                 }
879                 line_no++;
880         }
881         fclose(fp);
882         return true;
883 }
884
885 /**
886  * Read ngIRCd configuration file.
887  *
888  * Please note that this function uses exit(1) on fatal errors and therefore
889  * can result in ngIRCd terminating!
890  *
891  * @param ngircd_starting       Flag indicating if ngIRCd is starting or not.
892  * @returns                     true when the configuration file has been read
893  *                              successfully; false otherwise.
894  */
895 static bool
896 Read_Config(bool TestOnly, bool IsStarting)
897 {
898         const UINT16 defaultport = 6667;
899         char *ptr, file[FNAME_LEN];
900         struct dirent *entry;
901         int i, n;
902         FILE *fd;
903         DIR *dh;
904
905         /* Open configuration file */
906         fd = fopen( NGIRCd_ConfFile, "r" );
907         if( ! fd ) {
908                 /* No configuration file found! */
909                 Config_Error( LOG_ALERT, "Can't read configuration \"%s\": %s",
910                                         NGIRCd_ConfFile, strerror( errno ));
911                 if (!IsStarting)
912                         return false;
913                 Config_Error( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
914                 exit( 1 );
915         }
916
917         opers_free();
918         Set_Defaults(IsStarting);
919
920         if (TestOnly)
921                 Config_Error(LOG_INFO,
922                              "Reading configuration from \"%s\" ...",
923                              NGIRCd_ConfFile );
924
925         /* Clean up server configuration structure: mark all already
926          * configured servers as "once" so that they are deleted
927          * after the next disconnect and delete all unused servers.
928          * And delete all servers which are "duplicates" of servers
929          * that are already marked as "once" (such servers have been
930          * created by the last rehash but are now useless). */
931         for( i = 0; i < MAX_SERVERS; i++ ) {
932                 if( Conf_Server[i].conn_id == NONE ) Init_Server_Struct( &Conf_Server[i] );
933                 else {
934                         /* This structure is in use ... */
935                         if( Conf_Server[i].flags & CONF_SFLAG_ONCE ) {
936                                 /* Check for duplicates */
937                                 for( n = 0; n < MAX_SERVERS; n++ ) {
938                                         if( n == i ) continue;
939
940                                         if( Conf_Server[i].conn_id == Conf_Server[n].conn_id ) {
941                                                 Init_Server_Struct( &Conf_Server[n] );
942 #ifdef DEBUG
943                                                 Log(LOG_DEBUG,"Deleted unused duplicate server %d (kept %d).",
944                                                                                                 n, i );
945 #endif
946                                         }
947                                 }
948                         } else {
949                                 /* Mark server as "once" */
950                                 Conf_Server[i].flags |= CONF_SFLAG_ONCE;
951                                 Log( LOG_DEBUG, "Marked server %d as \"once\"", i );
952                         }
953                 }
954         }
955
956         /* Initialize variables */
957         Init_Server_Struct( &New_Server );
958         New_Server_Idx = NONE;
959 #ifdef SSL_SUPPORT
960         ConfSSL_Init();
961 #endif
962
963         Read_Config_File(NGIRCd_ConfFile, fd);
964         fclose(fd);
965
966         if (Conf_IncludeDir[0]) {
967                 dh = opendir(Conf_IncludeDir);
968                 if (!dh)
969                         Config_Error(LOG_ALERT,
970                                      "Can't open include directory \"%s\": %s",
971                                      Conf_IncludeDir, strerror(errno));
972         } else {
973                 strlcpy(Conf_IncludeDir, SYSCONFDIR, sizeof(Conf_IncludeDir));
974                 strlcat(Conf_IncludeDir, CONFIG_DIR, sizeof(Conf_IncludeDir));
975                 dh = opendir(Conf_IncludeDir);
976         }
977
978         /* Include further configuration files, if IncludeDir is available */
979         if (dh) {
980                 while ((entry = readdir(dh)) != NULL) {
981                         ptr = strrchr(entry->d_name, '.');
982                         if (!ptr || strcasecmp(ptr, ".conf") != 0)
983                                 continue;
984                         snprintf(file, sizeof(file), "%s/%s",
985                                  Conf_IncludeDir, entry->d_name);
986                         if (TestOnly)
987                                 Config_Error(LOG_INFO,
988                                              "Reading configuration from \"%s\" ...",
989                                              file);
990                         fd = fopen(file, "r");
991                         if (fd) {
992                                 Read_Config_File(file, fd);
993                                 fclose(fd);
994                         } else
995                                 Config_Error(LOG_ALERT,
996                                              "Can't read configuration \"%s\": %s",
997                                              file, strerror(errno));
998                 }
999                 closedir(dh);
1000         }
1001
1002         /* Check if there is still a server to add */
1003         if( New_Server.name[0] ) {
1004                 /* Copy data to "real" server structure */
1005                 assert( New_Server_Idx > NONE );
1006                 Conf_Server[New_Server_Idx] = New_Server;
1007         }
1008
1009         /* not a single listening port? Add default. */
1010         if (no_listenports() &&
1011                 !array_copyb(&Conf_ListenPorts, (char*) &defaultport, sizeof defaultport))
1012         {
1013                 Config_Error(LOG_ALERT, "Could not add default listening Port %u: %s",
1014                                         (unsigned int) defaultport, strerror(errno));
1015
1016                 exit(1);
1017         }
1018
1019         if (!Conf_ListenAddress)
1020                 Conf_ListenAddress = strdup_warn(DEFAULT_LISTEN_ADDRSTR);
1021
1022         if (!Conf_ListenAddress) {
1023                 Config_Error(LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME);
1024                 exit(1);
1025         }
1026
1027         /* No MOTD phrase configured? (re)try motd file. */
1028         if (array_bytes(&Conf_Motd) == 0) {
1029                 if (Read_TextFile(Conf_MotdFile, "MOTD", &Conf_Motd))
1030                         Using_MotdFile = true;
1031         }
1032
1033         /* Try to read ngIRCd help text file. */
1034         (void)Read_TextFile(Conf_HelpFile, "help text", &Conf_Helptext);
1035         if (!array_bytes(&Conf_Helptext))
1036                 Config_Error(LOG_WARNING,
1037                     "No help text available, HELP command will be of limited use.");
1038
1039 #ifdef SSL_SUPPORT
1040         /* Make sure that all SSL-related files are readable */
1041         CheckFileReadable("CertFile", Conf_SSLOptions.CertFile);
1042         CheckFileReadable("DHFile", Conf_SSLOptions.DHFile);
1043         CheckFileReadable("KeyFile", Conf_SSLOptions.KeyFile);
1044
1045         /* Set the default ciphers if none were configured */
1046         if (!Conf_SSLOptions.CipherList)
1047                 Conf_SSLOptions.CipherList = strdup_warn(DEFAULT_CIPHERS);
1048 #endif
1049
1050         return true;
1051 }
1052
1053 /**
1054  * Read in and handle a configuration file.
1055  *
1056  * @param File Name of the configuration file.
1057  * @param fd File descriptor already opened for reading.
1058  */
1059 static void
1060 Read_Config_File(const char *File, FILE *fd)
1061 {
1062         char section[LINE_LEN], str[LINE_LEN], *var, *arg, *ptr;
1063         int i, line = 0;
1064         size_t count;
1065
1066         /* Read configuration file */
1067         section[0] = '\0';
1068         while (true) {
1069                 if (!fgets(str, sizeof(str), fd))
1070                         break;
1071                 ngt_TrimStr(str);
1072                 line++;
1073
1074                 /* Skip comments and empty lines */
1075                 if (str[0] == ';' || str[0] == '#' || str[0] == '\0')
1076                         continue;
1077
1078                 if (strlen(str) >= sizeof(str) - 1) {
1079                         Config_Error(LOG_WARNING, "%s, line %d too long!",
1080                                      File, line);
1081                         continue;
1082                 }
1083
1084                 /* Is this the beginning of a new section? */
1085                 if ((str[0] == '[') && (str[strlen(str) - 1] == ']')) {
1086                         strlcpy(section, str, sizeof(section));
1087                         if (strcasecmp(section, "[GLOBAL]") == 0
1088                             || strcasecmp(section, "[LIMITS]") == 0
1089                             || strcasecmp(section, "[OPTIONS]") == 0
1090 #ifdef SSL_SUPPORT
1091                             || strcasecmp(section, "[SSL]") == 0
1092 #endif
1093                             )
1094                                 continue;
1095
1096                         if (strcasecmp(section, "[SERVER]") == 0) {
1097                                 /* Check if there is already a server to add */
1098                                 if (New_Server.name[0]) {
1099                                         /* Copy data to "real" server structure */
1100                                         assert(New_Server_Idx > NONE);
1101                                         Conf_Server[New_Server_Idx] =
1102                                         New_Server;
1103                                 }
1104
1105                                 /* Re-init structure for new server */
1106                                 Init_Server_Struct(&New_Server);
1107
1108                                 /* Search unused item in server configuration structure */
1109                                 for (i = 0; i < MAX_SERVERS; i++) {
1110                                         /* Is this item used? */
1111                                         if (!Conf_Server[i].name[0])
1112                                                 break;
1113                                 }
1114                                 if (i >= MAX_SERVERS) {
1115                                         /* Oops, no free item found! */
1116                                         Config_Error(LOG_ERR,
1117                                                      "Too many servers configured.");
1118                                         New_Server_Idx = NONE;
1119                                 } else
1120                                         New_Server_Idx = i;
1121                                 continue;
1122                         }
1123
1124                         if (strcasecmp(section, "[CHANNEL]") == 0) {
1125                                 count = array_length(&Conf_Channels,
1126                                                      sizeof(struct
1127                                                             Conf_Channel));
1128                                 if (!array_alloc
1129                                     (&Conf_Channels,
1130                                      sizeof(struct Conf_Channel), count)) {
1131                                             Config_Error(LOG_ERR,
1132                                                          "Could not allocate memory for new operator (line %d)",
1133                                                          line);
1134                                     }
1135                                 continue;
1136                         }
1137
1138                         if (strcasecmp(section, "[OPERATOR]") == 0) {
1139                                 count = array_length(&Conf_Opers,
1140                                                      sizeof(struct Conf_Oper));
1141                                 if (!array_alloc(&Conf_Opers,
1142                                                  sizeof(struct Conf_Oper),
1143                                                  count)) {
1144                                         Config_Error(LOG_ERR,
1145                                                      "Could not allocate memory for new channel (line &d)",
1146                                                      line);
1147                                 }
1148                                 continue;
1149                         }
1150
1151                         Config_Error(LOG_ERR,
1152                                      "%s, line %d: Unknown section \"%s\"!",
1153                                      File, line, section);
1154                         section[0] = 0x1;
1155                 }
1156                 if (section[0] == 0x1)
1157                         continue;
1158
1159                 /* Split line into variable name and parameters */
1160                 ptr = strchr(str, '=');
1161                 if (!ptr) {
1162                         Config_Error(LOG_ERR, "%s, line %d: Syntax error!",
1163                                      File, line);
1164                         continue;
1165                 }
1166                 *ptr = '\0';
1167                 var = str;
1168                 ngt_TrimStr(var);
1169                 arg = ptr + 1;
1170                 ngt_TrimStr(arg);
1171
1172                 if (strcasecmp(section, "[GLOBAL]") == 0)
1173                         Handle_GLOBAL(File, line, var, arg);
1174                 else if (strcasecmp(section, "[LIMITS]") == 0)
1175                         Handle_LIMITS(File, line, var, arg);
1176                 else if (strcasecmp(section, "[OPTIONS]") == 0)
1177                         Handle_OPTIONS(File, line, var, arg);
1178 #ifdef SSL_SUPPORT
1179                 else if (strcasecmp(section, "[SSL]") == 0)
1180                         Handle_SSL(File, line, var, arg);
1181 #endif
1182                 else if (strcasecmp(section, "[OPERATOR]") == 0)
1183                         Handle_OPERATOR(File, line, var, arg);
1184                 else if (strcasecmp(section, "[SERVER]") == 0)
1185                         Handle_SERVER(File, line, var, arg);
1186                 else if (strcasecmp(section, "[CHANNEL]") == 0)
1187                         Handle_CHANNEL(File, line, var, arg);
1188                 else
1189                         Config_Error(LOG_ERR,
1190                                      "%s, line %d: Variable \"%s\" outside section!",
1191                                      File, line, var);
1192         }
1193 }
1194
1195 /**
1196  * Check whether a string argument is "true" or "false".
1197  *
1198  * @param Arg   Input string.
1199  * @returns     true if the input string has been parsed as "yes", "true"
1200  *              (case insensitive) or a non-zero integer value.
1201  */
1202 static bool
1203 Check_ArgIsTrue(const char *Arg)
1204 {
1205         if (strcasecmp(Arg, "yes") == 0)
1206                 return true;
1207         if (strcasecmp(Arg, "true") == 0)
1208                 return true;
1209         if (atoi(Arg) != 0)
1210                 return true;
1211
1212         return false;
1213 }
1214
1215 /**
1216  * Handle setting of "MaxNickLength".
1217  *
1218  * @param Line  Line number in configuration file.
1219  * @raram Arg   Input string.
1220  * @returns     New configured maximum nickname length.
1221  */
1222 static unsigned int
1223 Handle_MaxNickLength(const char *File, int Line, const char *Arg)
1224 {
1225         unsigned new;
1226
1227         new = (unsigned) atoi(Arg) + 1;
1228         if (new > CLIENT_NICK_LEN) {
1229                 Config_Error(LOG_WARNING,
1230                              "%s, line %d: Value of \"MaxNickLength\" exceeds %u!",
1231                              File, Line, CLIENT_NICK_LEN - 1);
1232                 return CLIENT_NICK_LEN;
1233         }
1234         if (new < 2) {
1235                 Config_Error(LOG_WARNING,
1236                              "%s, line %d: Value of \"MaxNickLength\" must be at least 1!",
1237                              File, Line);
1238                 return 2;
1239         }
1240         return new;
1241 }
1242
1243 /**
1244  * Output a warning messages if IDENT is configured but not compiled in.
1245  */
1246 static void
1247 WarnIdent(const char UNUSED *File, int UNUSED Line)
1248 {
1249 #ifndef IDENTAUTH
1250         if (Conf_Ident) {
1251                 /* user has enabled ident lookups explicitly, but ... */
1252                 Config_Error(LOG_WARNING,
1253                         "%s: line %d: \"Ident = yes\", but ngircd was built without IDENT support!",
1254                         File, Line);
1255         }
1256 #endif
1257 }
1258
1259 /**
1260  * Output a warning messages if IPv6 is configured but not compiled in.
1261  */
1262 static void
1263 WarnIPv6(const char UNUSED *File, int UNUSED Line)
1264 {
1265 #ifndef WANT_IPV6
1266         if (Conf_ConnectIPv6) {
1267                 /* user has enabled IPv6 explicitly, but ... */
1268                 Config_Error(LOG_WARNING,
1269                         "%s: line %d: \"ConnectIPv6 = yes\", but ngircd was built without IPv6 support!",
1270                         File, Line);
1271         }
1272 #endif
1273 }
1274
1275 /**
1276  * Output a warning messages if PAM is configured but not compiled in.
1277  */
1278 static void
1279 WarnPAM(const char UNUSED *File, int UNUSED Line)
1280 {
1281 #ifndef PAM
1282         if (Conf_PAM) {
1283                 Config_Error(LOG_WARNING,
1284                         "%s: line %d: \"PAM = yes\", but ngircd was built without PAM support!",
1285                         File, Line);
1286         }
1287 #endif
1288 }
1289
1290 /**
1291  * Handle legacy "NoXXX" options in [GLOBAL] section.
1292  *
1293  * TODO: This function and support for "NoXXX" could be removed starting
1294  * with ngIRCd release 19 (one release after marking it "deprecated").
1295  *
1296  * @param Var   Variable name.
1297  * @param Arg   Argument string.
1298  * @returns     true if a NoXXX option has been processed; false otherwise.
1299  */
1300 static bool
1301 CheckLegacyNoOption(const char *Var, const char *Arg)
1302 {
1303         if(strcasecmp(Var, "NoDNS") == 0) {
1304                 Conf_DNS = !Check_ArgIsTrue( Arg );
1305                 return true;
1306         }
1307         if (strcasecmp(Var, "NoIdent") == 0) {
1308                 Conf_Ident = !Check_ArgIsTrue(Arg);
1309                 return true;
1310         }
1311         if(strcasecmp(Var, "NoPAM") == 0) {
1312                 Conf_PAM = !Check_ArgIsTrue(Arg);
1313                 return true;
1314         }
1315         return false;
1316 }
1317
1318 /**
1319  * Handle deprecated legacy options in [GLOBAL] section.
1320  *
1321  * TODO: This function and support for these options in the [Global] section
1322  * could be removed starting with ngIRCd release 19 (one release after
1323  * marking it "deprecated").
1324  *
1325  * @param Var   Variable name.
1326  * @param Arg   Argument string.
1327  * @returns     true if a legacy option has been processed; false otherwise.
1328  */
1329 static const char*
1330 CheckLegacyGlobalOption(const char *File, int Line, char *Var, char *Arg)
1331 {
1332         if (strcasecmp(Var, "AllowRemoteOper") == 0
1333             || strcasecmp(Var, "ChrootDir") == 0
1334             || strcasecmp(Var, "ConnectIPv4") == 0
1335             || strcasecmp(Var, "ConnectIPv6") == 0
1336             || strcasecmp(Var, "OperCanUseMode") == 0
1337             || strcasecmp(Var, "OperChanPAutoOp") == 0
1338             || strcasecmp(Var, "OperServerMode") == 0
1339             || strcasecmp(Var, "PredefChannelsOnly") == 0
1340             || strcasecmp(Var, "SyslogFacility") == 0
1341             || strcasecmp(Var, "WebircPassword") == 0) {
1342                 Handle_OPTIONS(File, Line, Var, Arg);
1343                 return "[Options]";
1344         }
1345         if (strcasecmp(Var, "ConnectRetry") == 0
1346             || strcasecmp(Var, "IdleTimeout") == 0
1347             || strcasecmp(Var, "MaxConnections") == 0
1348             || strcasecmp(Var, "MaxConnectionsIP") == 0
1349             || strcasecmp(Var, "MaxJoins") == 0
1350             || strcasecmp(Var, "MaxNickLength") == 0
1351             || strcasecmp(Var, "PingTimeout") == 0
1352             || strcasecmp(Var, "PongTimeout") == 0) {
1353                 Handle_LIMITS(File, Line, Var, Arg);
1354                 return "[Limits]";
1355         }
1356 #ifdef SSL_SUPPORT
1357         if (strcasecmp(Var, "SSLCertFile") == 0
1358             || strcasecmp(Var, "SSLDHFile") == 0
1359             || strcasecmp(Var, "SSLKeyFile") == 0
1360             || strcasecmp(Var, "SSLKeyFilePassword") == 0
1361             || strcasecmp(Var, "SSLPorts") == 0) {
1362                 Handle_SSL(File, Line, Var + 3, Arg);
1363                 return "[SSL]";
1364         }
1365 #endif
1366
1367         return NULL;
1368 }
1369
1370 /**
1371  * Strip "no" prefix of a string.
1372  *
1373  * TODO: This function and support for "NoXXX" should be removed starting
1374  * with ngIRCd release 19! (One release after marking it "deprecated").
1375  *
1376  * @param str   Pointer to input string starting with "no".
1377  * @returns     New pointer to string without "no" prefix.
1378  */
1379 static const char *
1380 NoNo(const char *str)
1381 {
1382         assert(strncasecmp("no", str, 2) == 0 && str[2]);
1383         return str + 2;
1384 }
1385
1386 /**
1387  * Invert "boolean" string.
1388  *
1389  * TODO: This function and support for "NoXXX" should be removed starting
1390  * with ngIRCd release 19! (One release after marking it "deprecated").
1391  *
1392  * @param arg   "Boolean" input string.
1393  * @returns     Pointer to inverted "boolean string".
1394  */
1395 static const char *
1396 InvertArg(const char *arg)
1397 {
1398         return yesno_to_str(!Check_ArgIsTrue(arg));
1399 }
1400
1401 /**
1402  * Handle variable in [Global] configuration section.
1403  *
1404  * @param Line  Line numer in configuration file.
1405  * @param Var   Variable name.
1406  * @param Arg   Variable argument.
1407  */
1408 static void
1409 Handle_GLOBAL(const char *File, int Line, char *Var, char *Arg )
1410 {
1411         struct passwd *pwd;
1412         struct group *grp;
1413         size_t len;
1414         const char *section;
1415         char *ptr;
1416
1417         assert(File != NULL);
1418         assert(Line > 0);
1419         assert(Var != NULL);
1420         assert(Arg != NULL);
1421
1422         if (strcasecmp(Var, "Name") == 0) {
1423                 len = strlcpy(Conf_ServerName, Arg, sizeof(Conf_ServerName));
1424                 if (len >= sizeof(Conf_ServerName))
1425                         Config_Error_TooLong(File, Line, Var);
1426                 return;
1427         }
1428         if (strcasecmp(Var, "AdminInfo1") == 0) {
1429                 len = strlcpy(Conf_ServerAdmin1, Arg, sizeof(Conf_ServerAdmin1));
1430                 if (len >= sizeof(Conf_ServerAdmin1))
1431                         Config_Error_TooLong(File, Line, Var);
1432                 return;
1433         }
1434         if (strcasecmp(Var, "AdminInfo2") == 0) {
1435                 len = strlcpy(Conf_ServerAdmin2, Arg, sizeof(Conf_ServerAdmin2));
1436                 if (len >= sizeof(Conf_ServerAdmin2))
1437                         Config_Error_TooLong(File, Line, Var);
1438                 return;
1439         }
1440         if (strcasecmp(Var, "AdminEMail") == 0) {
1441                 len = strlcpy(Conf_ServerAdminMail, Arg,
1442                         sizeof(Conf_ServerAdminMail));
1443                 if (len >= sizeof(Conf_ServerAdminMail))
1444                         Config_Error_TooLong(File, Line, Var);
1445                 return;
1446         }
1447         if (strcasecmp(Var, "Info") == 0) {
1448                 len = strlcpy(Conf_ServerInfo, Arg, sizeof(Conf_ServerInfo));
1449                 if (len >= sizeof(Conf_ServerInfo))
1450                         Config_Error_TooLong(File, Line, Var);
1451                 return;
1452         }
1453         if (strcasecmp(Var, "HelpFile") == 0) {
1454                 len = strlcpy(Conf_HelpFile, Arg, sizeof(Conf_HelpFile));
1455                 if (len >= sizeof(Conf_HelpFile))
1456                         Config_Error_TooLong(File, Line, Var);
1457                 return;
1458         }
1459         if (strcasecmp(Var, "Listen") == 0) {
1460                 if (Conf_ListenAddress) {
1461                         Config_Error(LOG_ERR,
1462                                      "Multiple Listen= options, ignoring: %s",
1463                                      Arg);
1464                         return;
1465                 }
1466                 Conf_ListenAddress = strdup_warn(Arg);
1467                 /* If allocation fails, we're in trouble: we cannot ignore the
1468                  * error -- otherwise ngircd would listen on all interfaces. */
1469                 if (!Conf_ListenAddress) {
1470                         Config_Error(LOG_ALERT,
1471                                      "%s exiting due to fatal errors!",
1472                                      PACKAGE_NAME);
1473                         exit(1);
1474                 }
1475                 return;
1476         }
1477         if (strcasecmp(Var, "MotdFile") == 0) {
1478                 len = strlcpy(Conf_MotdFile, Arg, sizeof(Conf_MotdFile));
1479                 if (len >= sizeof(Conf_MotdFile))
1480                         Config_Error_TooLong(File, Line, Var);
1481                 return;
1482         }
1483         if (strcasecmp(Var, "MotdPhrase") == 0) {
1484                 len = strlen(Arg);
1485                 if (len == 0)
1486                         return;
1487                 if (len >= 127) {
1488                         Config_Error_TooLong(File, Line, Var);
1489                         return;
1490                 }
1491                 if (!array_copyb(&Conf_Motd, Arg, len + 1))
1492                         Config_Error(LOG_WARNING,
1493                                      "%s, line %d: Could not append MotdPhrase: %s",
1494                                      File, Line, strerror(errno));
1495                 Using_MotdFile = false;
1496                 return;
1497         }
1498         if (strcasecmp(Var, "Network") == 0) {
1499                 len = strlcpy(Conf_Network, Arg, sizeof(Conf_Network));
1500                 if (len >= sizeof(Conf_Network))
1501                         Config_Error_TooLong(File, Line, Var);
1502                 ptr = strchr(Conf_Network, ' ');
1503                 if (ptr) {
1504                         Config_Error(LOG_WARNING,
1505                                      "%s, line %d: \"Network\" can't contain spaces!",
1506                                      File, Line);
1507                         *ptr = '\0';
1508                 }
1509                 return;
1510         }
1511         if(strcasecmp(Var, "Password") == 0) {
1512                 len = strlcpy(Conf_ServerPwd, Arg, sizeof(Conf_ServerPwd));
1513                 if (len >= sizeof(Conf_ServerPwd))
1514                         Config_Error_TooLong(File, Line, Var);
1515                 return;
1516         }
1517         if (strcasecmp(Var, "PidFile") == 0) {
1518                 len = strlcpy(Conf_PidFile, Arg, sizeof(Conf_PidFile));
1519                 if (len >= sizeof(Conf_PidFile))
1520                         Config_Error_TooLong(File, Line, Var);
1521                 return;
1522         }
1523         if (strcasecmp(Var, "Ports") == 0) {
1524                 ports_parse(&Conf_ListenPorts, File, Line, Arg);
1525                 return;
1526         }
1527         if (strcasecmp(Var, "ServerGID") == 0) {
1528                 grp = getgrnam(Arg);
1529                 if (grp)
1530                         Conf_GID = grp->gr_gid;
1531                 else {
1532                         Conf_GID = (unsigned int)atoi(Arg);
1533                         if (!Conf_GID && strcmp(Arg, "0"))
1534                                 Config_Error(LOG_WARNING,
1535                                              "%s, line %d: Value of \"%s\" is not a valid group name or ID!",
1536                                              File, Line, Var);
1537                 }
1538                 return;
1539         }
1540         if (strcasecmp(Var, "ServerUID") == 0) {
1541                 pwd = getpwnam(Arg);
1542                 if (pwd)
1543                         Conf_UID = pwd->pw_uid;
1544                 else {
1545                         Conf_UID = (unsigned int)atoi(Arg);
1546                         if (!Conf_UID && strcmp(Arg, "0"))
1547                                 Config_Error(LOG_WARNING,
1548                                              "%s, line %d: Value of \"%s\" is not a valid user name or ID!",
1549                                              File, Line, Var);
1550                 }
1551                 return;
1552         }
1553
1554         if (CheckLegacyNoOption(Var, Arg)) {
1555                 /* TODO: This function and support for "NoXXX" could be
1556                  * be removed starting with ngIRCd release 19 (one release
1557                  * after marking it "deprecated"). */
1558                 Config_Error(LOG_WARNING,
1559                              "%s, line %d (section \"Global\"): \"No\"-Prefix is deprecated, use \"%s = %s\" in [Options] section!",
1560                              File, Line, NoNo(Var), InvertArg(Arg));
1561                 if (strcasecmp(Var, "NoIdent") == 0)
1562                         WarnIdent(File, Line);
1563                 else if (strcasecmp(Var, "NoPam") == 0)
1564                         WarnPAM(File, Line);
1565                 return;
1566         }
1567         if ((section = CheckLegacyGlobalOption(File, Line, Var, Arg))) {
1568                 /** TODO: This function and support for these options in the
1569                  * [Global] section could be removed starting with ngIRCd
1570                  * release 19 (one release after marking it "deprecated"). */
1571                 if (strncasecmp(Var, "SSL", 3) == 0) {
1572                         Config_Error(LOG_WARNING,
1573                                      "%s, line %d (section \"Global\"): \"%s\" is deprecated here, move it to %s and rename to \"%s\"!",
1574                                      File, Line, Var, section,
1575                                      Var + 3);
1576                 } else {
1577                         Config_Error(LOG_WARNING,
1578                                      "%s, line %d (section \"Global\"): \"%s\" is deprecated here, move it to %s!",
1579                                      File, Line, Var, section);
1580                 }
1581                 return;
1582         }
1583
1584         Config_Error_Section(File, Line, Var, "Global");
1585 }
1586
1587 /**
1588  * Handle variable in [Limits] configuration section.
1589  *
1590  * @param Line  Line numer in configuration file.
1591  * @param Var   Variable name.
1592  * @param Arg   Variable argument.
1593  */
1594 static void
1595 Handle_LIMITS(const char *File, int Line, char *Var, char *Arg)
1596 {
1597         assert(File != NULL);
1598         assert(Line > 0);
1599         assert(Var != NULL);
1600         assert(Arg != NULL);
1601
1602         if (strcasecmp(Var, "ConnectRetry") == 0) {
1603                 Conf_ConnectRetry = atoi(Arg);
1604                 if (Conf_ConnectRetry < 5) {
1605                         Config_Error(LOG_WARNING,
1606                                      "%s, line %d: Value of \"ConnectRetry\" too low!",
1607                                      File, Line);
1608                         Conf_ConnectRetry = 5;
1609                 }
1610                 return;
1611         }
1612         if (strcasecmp(Var, "IdleTimeout") == 0) {
1613                 Conf_IdleTimeout = atoi(Arg);
1614                 if (!Conf_IdleTimeout && strcmp(Arg, "0"))
1615                         Config_Error_NaN(File, Line, Var);
1616                 return;
1617         }
1618         if (strcasecmp(Var, "MaxConnections") == 0) {
1619                 Conf_MaxConnections = atoi(Arg);
1620                 if (!Conf_MaxConnections && strcmp(Arg, "0"))
1621                         Config_Error_NaN(File, Line, Var);
1622                 return;
1623         }
1624         if (strcasecmp(Var, "MaxConnectionsIP") == 0) {
1625                 Conf_MaxConnectionsIP = atoi(Arg);
1626                 if (!Conf_MaxConnectionsIP && strcmp(Arg, "0"))
1627                         Config_Error_NaN(File, Line, Var);
1628                 return;
1629         }
1630         if (strcasecmp(Var, "MaxJoins") == 0) {
1631                 Conf_MaxJoins = atoi(Arg);
1632                 if (!Conf_MaxJoins && strcmp(Arg, "0"))
1633                         Config_Error_NaN(File, Line, Var);
1634                 return;
1635         }
1636         if (strcasecmp(Var, "MaxNickLength") == 0) {
1637                 Conf_MaxNickLength = Handle_MaxNickLength(File, Line, Arg);
1638                 return;
1639         }
1640         if (strcasecmp(Var, "MaxListSize") == 0) {
1641                 Conf_MaxListSize = atoi(Arg);
1642                 if (!Conf_MaxListSize && strcmp(Arg, "0"))
1643                         Config_Error_NaN(File, Line, Var);
1644                 return;
1645         }
1646         if (strcasecmp(Var, "PingTimeout") == 0) {
1647                 Conf_PingTimeout = atoi(Arg);
1648                 if (Conf_PingTimeout < 5) {
1649                         Config_Error(LOG_WARNING,
1650                                      "%s, line %d: Value of \"PingTimeout\" too low!",
1651                                      File, Line);
1652                         Conf_PingTimeout = 5;
1653                 }
1654                 return;
1655         }
1656         if (strcasecmp(Var, "PongTimeout") == 0) {
1657                 Conf_PongTimeout = atoi(Arg);
1658                 if (Conf_PongTimeout < 5) {
1659                         Config_Error(LOG_WARNING,
1660                                      "%s, line %d: Value of \"PongTimeout\" too low!",
1661                                      File, Line);
1662                         Conf_PongTimeout = 5;
1663                 }
1664                 return;
1665         }
1666
1667         Config_Error_Section(File, Line, Var, "Limits");
1668 }
1669
1670 /**
1671  * Handle variable in [Options] configuration section.
1672  *
1673  * @param Line  Line numer in configuration file.
1674  * @param Var   Variable name.
1675  * @param Arg   Variable argument.
1676  */
1677 static void
1678 Handle_OPTIONS(const char *File, int Line, char *Var, char *Arg)
1679 {
1680         size_t len;
1681         char *p;
1682
1683         assert(File != NULL);
1684         assert(Line > 0);
1685         assert(Var != NULL);
1686         assert(Arg != NULL);
1687
1688         if (strcasecmp(Var, "AllowedChannelTypes") == 0) {
1689                 p = Arg;
1690                 Conf_AllowedChannelTypes[0] = '\0';
1691                 while (*p) {
1692                         if (strchr(Conf_AllowedChannelTypes, *p)) {
1693                                 /* Prefix is already included; ignore it */
1694                                 p++;
1695                                 continue;
1696                         }
1697
1698                         if (strchr(CHANTYPES, *p)) {
1699                                 len = strlen(Conf_AllowedChannelTypes) + 1;
1700                                 assert(len < sizeof(Conf_AllowedChannelTypes));
1701                                 Conf_AllowedChannelTypes[len - 1] = *p;
1702                                 Conf_AllowedChannelTypes[len] = '\0';
1703                         } else {
1704                                 Config_Error(LOG_WARNING,
1705                                              "%s, line %d: Unknown channel prefix \"%c\" in \"AllowedChannelTypes\"!",
1706                                              File, Line, *p);
1707                         }
1708                         p++;
1709                 }
1710                 return;
1711         }
1712         if (strcasecmp(Var, "AllowRemoteOper") == 0) {
1713                 Conf_AllowRemoteOper = Check_ArgIsTrue(Arg);
1714                 return;
1715         }
1716         if (strcasecmp(Var, "ChrootDir") == 0) {
1717                 len = strlcpy(Conf_Chroot, Arg, sizeof(Conf_Chroot));
1718                 if (len >= sizeof(Conf_Chroot))
1719                         Config_Error_TooLong(File, Line, Var);
1720                 return;
1721         }
1722         if (strcasecmp(Var, "CloakHost") == 0) {
1723                 len = strlcpy(Conf_CloakHost, Arg, sizeof(Conf_CloakHost));
1724                 if (len >= sizeof(Conf_CloakHost))
1725                         Config_Error_TooLong(File, Line, Var);
1726                 return;
1727         }
1728         if (strcasecmp(Var, "CloakHostModeX") == 0) {
1729                 len = strlcpy(Conf_CloakHostModeX, Arg, sizeof(Conf_CloakHostModeX));
1730                 if (len >= sizeof(Conf_CloakHostModeX))
1731                         Config_Error_TooLong(File, Line, Var);
1732                 return;
1733         }
1734         if (strcasecmp(Var, "CloakHostSalt") == 0) {
1735                 len = strlcpy(Conf_CloakHostSalt, Arg, sizeof(Conf_CloakHostSalt));
1736                 if (len >= sizeof(Conf_CloakHostSalt))
1737                         Config_Error_TooLong(File, Line, Var);
1738                 return;
1739         }
1740         if (strcasecmp(Var, "CloakUserToNick") == 0) {
1741                 Conf_CloakUserToNick = Check_ArgIsTrue(Arg);
1742                 return;
1743         }
1744         if (strcasecmp(Var, "ConnectIPv6") == 0) {
1745                 Conf_ConnectIPv6 = Check_ArgIsTrue(Arg);
1746                 WarnIPv6(File, Line);
1747                 return;
1748         }
1749         if (strcasecmp(Var, "ConnectIPv4") == 0) {
1750                 Conf_ConnectIPv4 = Check_ArgIsTrue(Arg);
1751                 return;
1752         }
1753         if (strcasecmp(Var, "DefaultUserModes") == 0) {
1754                 p = Arg;
1755                 Conf_DefaultUserModes[0] = '\0';
1756                 while (*p) {
1757                         if (strchr(Conf_DefaultUserModes, *p)) {
1758                                 /* Mode is already included; ignore it */
1759                                 p++;
1760                                 continue;
1761                         }
1762
1763                         if (strchr(USERMODES, *p)) {
1764                                 len = strlen(Conf_DefaultUserModes) + 1;
1765                                 assert(len < sizeof(Conf_DefaultUserModes));
1766                                 Conf_DefaultUserModes[len - 1] = *p;
1767                                 Conf_DefaultUserModes[len] = '\0';
1768                         } else {
1769                                 Config_Error(LOG_WARNING,
1770                                              "%s, line %d: Unknown user mode \"%c\" in \"DefaultUserModes\"!",
1771                                              File, Line, *p);
1772                         }
1773                         p++;
1774                 }
1775                 return;
1776         }
1777         if (strcasecmp(Var, "DNS") == 0) {
1778                 Conf_DNS = Check_ArgIsTrue(Arg);
1779                 return;
1780         }
1781         if (strcasecmp(Var, "Ident") == 0) {
1782                 Conf_Ident = Check_ArgIsTrue(Arg);
1783                 WarnIdent(File, Line);
1784                 return;
1785         }
1786         if (strcasecmp(Var, "IncludeDir") == 0) {
1787                 if (Conf_IncludeDir[0]) {
1788                         Config_Error(LOG_ERR,
1789                                      "%s, line %d: Can't overwrite value of \"IncludeDir\" variable!",
1790                                      File, Line);
1791                         return;
1792                 }
1793                 len = strlcpy(Conf_IncludeDir, Arg, sizeof(Conf_IncludeDir));
1794                 if (len >= sizeof(Conf_IncludeDir))
1795                         Config_Error_TooLong(File, Line, Var);
1796                 return;
1797         }
1798         if (strcasecmp(Var, "MorePrivacy") == 0) {
1799                 Conf_MorePrivacy = Check_ArgIsTrue(Arg);
1800                 return;
1801         }
1802         if (strcasecmp(Var, "NoticeAuth") == 0) {
1803                 Conf_NoticeAuth = Check_ArgIsTrue(Arg);
1804                 return;
1805         }
1806         if (strcasecmp(Var, "OperCanUseMode") == 0) {
1807                 Conf_OperCanMode = Check_ArgIsTrue(Arg);
1808                 return;
1809         }
1810         if (strcasecmp(Var, "OperChanPAutoOp") == 0) {
1811                 Conf_OperChanPAutoOp = Check_ArgIsTrue(Arg);
1812                 return;
1813         }
1814         if (strcasecmp(Var, "OperServerMode") == 0) {
1815                 Conf_OperServerMode = Check_ArgIsTrue(Arg);
1816                 return;
1817         }
1818         if (strcasecmp(Var, "PAM") == 0) {
1819                 Conf_PAM = Check_ArgIsTrue(Arg);
1820                 WarnPAM(File, Line);
1821                 return;
1822         }
1823         if (strcasecmp(Var, "PAMIsOptional") == 0 ) {
1824                 Conf_PAMIsOptional = Check_ArgIsTrue(Arg);
1825                 return;
1826         }
1827         if (strcasecmp(Var, "PredefChannelsOnly") == 0) {
1828                 /*
1829                  * TODO: This section and support for "PredefChannelsOnly"
1830                  * could be removed starting with ngIRCd release 22 (one
1831                  * release after marking it "deprecated") ...
1832                  */
1833                 Config_Error(LOG_WARNING,
1834                              "%s, line %d (section \"Options\"): \"%s\" is deprecated, please use \"AllowedChannelTypes\"!",
1835                              File, Line, Var);
1836                 if (Check_ArgIsTrue(Arg))
1837                         Conf_AllowedChannelTypes[0] = '\0';
1838                 else
1839                         strlcpy(Conf_AllowedChannelTypes, CHANTYPES,
1840                                 sizeof(Conf_AllowedChannelTypes));
1841                 return;
1842         }
1843 #ifndef STRICT_RFC
1844         if (strcasecmp(Var, "RequireAuthPing") == 0) {
1845                 Conf_AuthPing = Check_ArgIsTrue(Arg);
1846                 return;
1847         }
1848 #endif
1849         if (strcasecmp(Var, "ScrubCTCP") == 0) {
1850                 Conf_ScrubCTCP = Check_ArgIsTrue(Arg);
1851                 return;
1852         }
1853 #ifdef SYSLOG
1854         if (strcasecmp(Var, "SyslogFacility") == 0) {
1855                 Conf_SyslogFacility = ngt_SyslogFacilityID(Arg,
1856                                                            Conf_SyslogFacility);
1857                 return;
1858         }
1859 #endif
1860         if (strcasecmp(Var, "WebircPassword") == 0) {
1861                 len = strlcpy(Conf_WebircPwd, Arg, sizeof(Conf_WebircPwd));
1862                 if (len >= sizeof(Conf_WebircPwd))
1863                         Config_Error_TooLong(File, Line, Var);
1864                 return;
1865         }
1866
1867         Config_Error_Section(File, Line, Var, "Options");
1868 }
1869
1870 #ifdef SSL_SUPPORT
1871
1872 /**
1873  * Handle variable in [SSL] configuration section.
1874  *
1875  * @param Line  Line numer in configuration file.
1876  * @param Var   Variable name.
1877  * @param Arg   Variable argument.
1878  */
1879 static void
1880 Handle_SSL(const char *File, int Line, char *Var, char *Arg)
1881 {
1882         assert(File != NULL);
1883         assert(Line > 0);
1884         assert(Var != NULL);
1885         assert(Arg != NULL);
1886
1887         if (strcasecmp(Var, "CertFile") == 0) {
1888                 assert(Conf_SSLOptions.CertFile == NULL);
1889                 Conf_SSLOptions.CertFile = strdup_warn(Arg);
1890                 return;
1891         }
1892         if (strcasecmp(Var, "DHFile") == 0) {
1893                 assert(Conf_SSLOptions.DHFile == NULL);
1894                 Conf_SSLOptions.DHFile = strdup_warn(Arg);
1895                 return;
1896         }
1897         if (strcasecmp(Var, "KeyFile") == 0) {
1898                 assert(Conf_SSLOptions.KeyFile == NULL);
1899                 Conf_SSLOptions.KeyFile = strdup_warn(Arg);
1900                 return;
1901         }
1902         if (strcasecmp(Var, "KeyFilePassword") == 0) {
1903                 assert(array_bytes(&Conf_SSLOptions.KeyFilePassword) == 0);
1904                 if (!array_copys(&Conf_SSLOptions.KeyFilePassword, Arg))
1905                         Config_Error(LOG_ERR,
1906                                      "%s, line %d (section \"SSL\"): Could not copy %s: %s!",
1907                                      File, Line, Var, strerror(errno));
1908                 return;
1909         }
1910         if (strcasecmp(Var, "Ports") == 0) {
1911                 ports_parse(&Conf_SSLOptions.ListenPorts, File, Line, Arg);
1912                 return;
1913         }
1914         if (strcasecmp(Var, "CipherList") == 0) {
1915                 assert(Conf_SSLOptions.CipherList == NULL);
1916                 Conf_SSLOptions.CipherList = strdup_warn(Arg);
1917                 return;
1918         }
1919
1920         Config_Error_Section(File, Line, Var, "SSL");
1921 }
1922
1923 #endif
1924
1925 /**
1926  * Handle variable in [Operator] configuration section.
1927  *
1928  * @param Line  Line numer in configuration file.
1929  * @param Var   Variable name.
1930  * @param Arg   Variable argument.
1931  */
1932 static void
1933 Handle_OPERATOR(const char *File, int Line, char *Var, char *Arg )
1934 {
1935         size_t len;
1936         struct Conf_Oper *op;
1937
1938         assert( File != NULL );
1939         assert( Line > 0 );
1940         assert( Var != NULL );
1941         assert( Arg != NULL );
1942
1943         op = array_get(&Conf_Opers, sizeof(*op),
1944                          array_length(&Conf_Opers, sizeof(*op)) - 1);
1945         if (!op)
1946                 return;
1947
1948         if (strcasecmp(Var, "Name") == 0) {
1949                 /* Name of IRC operator */
1950                 len = strlcpy(op->name, Arg, sizeof(op->name));
1951                 if (len >= sizeof(op->name))
1952                                 Config_Error_TooLong(File, Line, Var);
1953                 return;
1954         }
1955         if (strcasecmp(Var, "Password") == 0) {
1956                 /* Password of IRC operator */
1957                 len = strlcpy(op->pwd, Arg, sizeof(op->pwd));
1958                 if (len >= sizeof(op->pwd))
1959                                 Config_Error_TooLong(File, Line, Var);
1960                 return;
1961         }
1962         if (strcasecmp(Var, "Mask") == 0) {
1963                 if (op->mask)
1964                         return; /* Hostname already configured */
1965                 op->mask = strdup_warn( Arg );
1966                 return;
1967         }
1968
1969         Config_Error_Section(File, Line, Var, "Operator");
1970 }
1971
1972 /**
1973  * Handle variable in [Server] configuration section.
1974  *
1975  * @param Line  Line numer in configuration file.
1976  * @param Var   Variable name.
1977  * @param Arg   Variable argument.
1978  */
1979 static void
1980 Handle_SERVER(const char *File, int Line, char *Var, char *Arg )
1981 {
1982         long port;
1983         size_t len;
1984
1985         assert( File != NULL );
1986         assert( Line > 0 );
1987         assert( Var != NULL );
1988         assert( Arg != NULL );
1989
1990         /* Ignore server block if no space is left in server configuration structure */
1991         if( New_Server_Idx <= NONE ) return;
1992
1993         if( strcasecmp( Var, "Host" ) == 0 ) {
1994                 /* Hostname of the server */
1995                 len = strlcpy( New_Server.host, Arg, sizeof( New_Server.host ));
1996                 if (len >= sizeof( New_Server.host ))
1997                         Config_Error_TooLong(File, Line, Var);
1998                 return;
1999         }
2000         if( strcasecmp( Var, "Name" ) == 0 ) {
2001                 /* Name of the server ("Nick"/"ID") */
2002                 len = strlcpy( New_Server.name, Arg, sizeof( New_Server.name ));
2003                 if (len >= sizeof( New_Server.name ))
2004                         Config_Error_TooLong(File, Line, Var);
2005                 return;
2006         }
2007         if (strcasecmp(Var, "Bind") == 0) {
2008                 if (ng_ipaddr_init(&New_Server.bind_addr, Arg, 0))
2009                         return;
2010
2011                 Config_Error(LOG_ERR, "%s, line %d (section \"Server\"): Can't parse IP address \"%s\"",
2012                              File, Line, Arg);
2013                 return;
2014         }
2015         if( strcasecmp( Var, "MyPassword" ) == 0 ) {
2016                 /* Password of this server which is sent to the peer */
2017                 if (*Arg == ':') {
2018                         Config_Error(LOG_ERR,
2019                                      "%s, line %d (section \"Server\"): MyPassword must not start with ':'!",
2020                                      File, Line);
2021                 }
2022                 len = strlcpy( New_Server.pwd_in, Arg, sizeof( New_Server.pwd_in ));
2023                 if (len >= sizeof( New_Server.pwd_in ))
2024                         Config_Error_TooLong(File, Line, Var);
2025                 return;
2026         }
2027         if( strcasecmp( Var, "PeerPassword" ) == 0 ) {
2028                 /* Passwort of the peer which must be received */
2029                 len = strlcpy( New_Server.pwd_out, Arg, sizeof( New_Server.pwd_out ));
2030                 if (len >= sizeof( New_Server.pwd_out ))
2031                         Config_Error_TooLong(File, Line, Var);
2032                 return;
2033         }
2034         if( strcasecmp( Var, "Port" ) == 0 ) {
2035                 /* Port to which this server should connect */
2036                 port = atol( Arg );
2037                 if (port >= 0 && port < 0xFFFF)
2038                         New_Server.port = (UINT16)port;
2039                 else
2040                         Config_Error(LOG_ERR,
2041                                      "%s, line %d (section \"Server\"): Illegal port number %ld!",
2042                                      File, Line, port );
2043                 return;
2044         }
2045 #ifdef SSL_SUPPORT
2046         if( strcasecmp( Var, "SSLConnect" ) == 0 ) {
2047                 New_Server.SSLConnect = Check_ArgIsTrue(Arg);
2048                 return;
2049         }
2050 #endif
2051         if( strcasecmp( Var, "Group" ) == 0 ) {
2052                 /* Server group */
2053                 New_Server.group = atoi( Arg );
2054                 if (!New_Server.group && strcmp(Arg, "0"))
2055                         Config_Error_NaN(File, Line, Var);
2056                 return;
2057         }
2058         if( strcasecmp( Var, "Passive" ) == 0 ) {
2059                 if (Check_ArgIsTrue(Arg))
2060                         New_Server.flags |= CONF_SFLAG_DISABLED;
2061                 return;
2062         }
2063         if (strcasecmp(Var, "ServiceMask") == 0) {
2064                 len = strlcpy(New_Server.svs_mask, ngt_LowerStr(Arg),
2065                               sizeof(New_Server.svs_mask));
2066                 if (len >= sizeof(New_Server.svs_mask))
2067                         Config_Error_TooLong(File, Line, Var);
2068                 return;
2069         }
2070
2071         Config_Error_Section(File, Line, Var, "Server");
2072 }
2073
2074 /**
2075  * Copy channel name into channel structure.
2076  *
2077  * If the channel name is not valid because of a missing prefix ('#', '&'),
2078  * a default prefix of '#' will be added.
2079  *
2080  * @param new_chan      New already allocated channel structure.
2081  * @param name          Name of the new channel.
2082  * @returns             true on success, false otherwise.
2083  */
2084 static bool
2085 Handle_Channelname(struct Conf_Channel *new_chan, const char *name)
2086 {
2087         size_t size = sizeof(new_chan->name);
2088         char *dest = new_chan->name;
2089
2090         if (!Channel_IsValidName(name)) {
2091                 /*
2092                  * maybe user forgot to add a '#'.
2093                  * This is only here for user convenience.
2094                  */
2095                 *dest = '#';
2096                 --size;
2097                 ++dest;
2098         }
2099         return size > strlcpy(dest, name, size);
2100 }
2101
2102 /**
2103  * Handle variable in [Channel] configuration section.
2104  *
2105  * @param Line  Line numer in configuration file.
2106  * @param Var   Variable name.
2107  * @param Arg   Variable argument.
2108  */
2109 static void
2110 Handle_CHANNEL(const char *File, int Line, char *Var, char *Arg)
2111 {
2112         size_t len;
2113         struct Conf_Channel *chan;
2114
2115         assert( File != NULL );
2116         assert( Line > 0 );
2117         assert( Var != NULL );
2118         assert( Arg != NULL );
2119
2120         chan = array_get(&Conf_Channels, sizeof(*chan),
2121                          array_length(&Conf_Channels, sizeof(*chan)) - 1);
2122         if (!chan)
2123                 return;
2124
2125         if (strcasecmp(Var, "Name") == 0) {
2126                 if (!Handle_Channelname(chan, Arg))
2127                         Config_Error_TooLong(File, Line, Var);
2128                 return;
2129         }
2130         if (strcasecmp(Var, "Modes") == 0) {
2131                 /* Initial modes */
2132                 len = strlcpy(chan->modes, Arg, sizeof(chan->modes));
2133                 if (len >= sizeof(chan->modes))
2134                         Config_Error_TooLong(File, Line, Var);
2135                 return;
2136         }
2137         if( strcasecmp( Var, "Topic" ) == 0 ) {
2138                 /* Initial topic */
2139                 len = strlcpy(chan->topic, Arg, sizeof(chan->topic));
2140                 if (len >= sizeof(chan->topic))
2141                         Config_Error_TooLong(File, Line, Var);
2142                 return;
2143         }
2144         if( strcasecmp( Var, "Key" ) == 0 ) {
2145                 /* Initial Channel Key (mode k) */
2146                 len = strlcpy(chan->key, Arg, sizeof(chan->key));
2147                 if (len >= sizeof(chan->key))
2148                         Config_Error_TooLong(File, Line, Var);
2149                 return;
2150         }
2151         if( strcasecmp( Var, "MaxUsers" ) == 0 ) {
2152                 /* maximum user limit, mode l */
2153                 chan->maxusers = (unsigned long) atol(Arg);
2154                 if (!chan->maxusers && strcmp(Arg, "0"))
2155                         Config_Error_NaN(File, Line, Var);
2156                 return;
2157         }
2158         if (strcasecmp(Var, "KeyFile") == 0) {
2159                 /* channel keys */
2160                 len = strlcpy(chan->keyfile, Arg, sizeof(chan->keyfile));
2161                 if (len >= sizeof(chan->keyfile))
2162                         Config_Error_TooLong(File, Line, Var);
2163                 return;
2164         }
2165
2166         Config_Error_Section(File, Line, Var, "Channel");
2167 }
2168
2169 /**
2170  * Validate server configuration.
2171  *
2172  * Please note that this function uses exit(1) on fatal errors and therefore
2173  * can result in ngIRCd terminating!
2174  *
2175  * @param Configtest    true if the daemon has been called with "--configtest".
2176  * @param Rehash        true if re-reading configuration on runtime.
2177  * @returns             true if configuration is valid.
2178  */
2179 static bool
2180 Validate_Config(bool Configtest, bool Rehash)
2181 {
2182         /* Validate configuration settings. */
2183
2184 #ifdef DEBUG
2185         int i, servers, servers_once;
2186 #endif
2187         bool config_valid = true;
2188         char *ptr;
2189
2190         /* Emit a warning when the config file is not a full path name */
2191         if (NGIRCd_ConfFile[0] && NGIRCd_ConfFile[0] != '/') {
2192                 Config_Error(LOG_WARNING,
2193                         "Not specifying a full path name to \"%s\" can cause problems when rehashing the server!",
2194                         NGIRCd_ConfFile);
2195         }
2196
2197         /* Validate configured server name, see RFC 2812 section 2.3.1 */
2198         ptr = Conf_ServerName;
2199         do {
2200                 if (*ptr >= 'a' && *ptr <= 'z') continue;
2201                 if (*ptr >= 'A' && *ptr <= 'Z') continue;
2202                 if (*ptr >= '0' && *ptr <= '9') continue;
2203                 if (ptr > Conf_ServerName) {
2204                         if (*ptr == '.' || *ptr == '-')
2205                                 continue;
2206                 }
2207                 Conf_ServerName[0] = '\0';
2208                 break;
2209         } while (*(++ptr));
2210
2211         if (!Conf_ServerName[0]) {
2212                 /* No server name configured! */
2213                 config_valid = false;
2214                 Config_Error(LOG_ALERT,
2215                              "No (valid) server name configured in \"%s\" (section 'Global': 'Name')!",
2216                              NGIRCd_ConfFile);
2217                 if (!Configtest && !Rehash) {
2218                         Config_Error(LOG_ALERT,
2219                                      "%s exiting due to fatal errors!",
2220                                      PACKAGE_NAME);
2221                         exit(1);
2222                 }
2223         }
2224
2225         if (Conf_ServerName[0] && !strchr(Conf_ServerName, '.')) {
2226                 /* No dot in server name! */
2227                 config_valid = false;
2228                 Config_Error(LOG_ALERT,
2229                              "Invalid server name configured in \"%s\" (section 'Global': 'Name'): Dot missing!",
2230                              NGIRCd_ConfFile);
2231                 if (!Configtest) {
2232                         Config_Error(LOG_ALERT,
2233                                      "%s exiting due to fatal errors!",
2234                                      PACKAGE_NAME);
2235                         exit(1);
2236                 }
2237         }
2238
2239 #ifdef STRICT_RFC
2240         if (!Conf_ServerAdminMail[0]) {
2241                 /* No administrative contact configured! */
2242                 config_valid = false;
2243                 Config_Error(LOG_ALERT,
2244                              "No administrator email address configured in \"%s\" ('AdminEMail')!",
2245                              NGIRCd_ConfFile);
2246                 if (!Configtest) {
2247                         Config_Error(LOG_ALERT,
2248                                      "%s exiting due to fatal errors!",
2249                                      PACKAGE_NAME);
2250                         exit(1);
2251                 }
2252         }
2253 #endif
2254
2255         if (!Conf_ServerAdmin1[0] && !Conf_ServerAdmin2[0]
2256             && !Conf_ServerAdminMail[0]) {
2257                 /* No administrative information configured! */
2258                 Config_Error(LOG_WARNING,
2259                              "No administrative information configured but required by RFC!");
2260         }
2261
2262 #ifdef PAM
2263         if (Conf_PAM && Conf_ServerPwd[0])
2264                 Config_Error(LOG_ERR,
2265                              "This server uses PAM, \"Password\" in [Global] section will be ignored!");
2266 #endif
2267
2268 #ifdef DEBUG
2269         servers = servers_once = 0;
2270         for (i = 0; i < MAX_SERVERS; i++) {
2271                 if (Conf_Server[i].name[0]) {
2272                         servers++;
2273                         if (Conf_Server[i].flags & CONF_SFLAG_ONCE)
2274                                 servers_once++;
2275                 }
2276         }
2277         Log(LOG_DEBUG,
2278             "Configuration: Operators=%ld, Servers=%d[%d], Channels=%ld",
2279             array_length(&Conf_Opers, sizeof(struct Conf_Oper)),
2280             servers, servers_once,
2281             array_length(&Conf_Channels, sizeof(struct Conf_Channel)));
2282 #endif
2283
2284         return config_valid;
2285 }
2286
2287 /**
2288  * Output "line too long" warning.
2289  *
2290  * @param Line  Line number in configuration file.
2291  * @param Item  Affected variable name.
2292  */
2293 static void
2294 Config_Error_TooLong(const char *File, const int Line, const char *Item)
2295 {
2296         Config_Error(LOG_WARNING, "%s, line %d: Value of \"%s\" too long!",
2297                      File, Line, Item );
2298 }
2299
2300 /**
2301  * Output "unknown variable" warning.
2302  *
2303  * @param Line          Line number in configuration file.
2304  * @param Item          Affected variable name.
2305  * @param Section       Section name.
2306  */
2307 static void
2308 Config_Error_Section(const char *File, const int Line, const char *Item,
2309                      const char *Section)
2310 {
2311         Config_Error(LOG_ERR, "%s, line %d (section \"%s\"): Unknown variable \"%s\"!",
2312                      File, Line, Section, Item);
2313 }
2314
2315 /**
2316  * Output "not a number" warning.
2317  *
2318  * @param Line  Line number in configuration file.
2319  * @param Item  Affected variable name.
2320  */
2321 static void
2322 Config_Error_NaN(const char *File, const int Line, const char *Item )
2323 {
2324         Config_Error(LOG_WARNING, "%s, line %d: Value of \"%s\" is not a number!",
2325                      File, Line, Item );
2326 }
2327
2328 /**
2329  * Output configuration error to console and/or logfile.
2330  *
2331  * On runtime, the normal log functions of the daemon are used. But when
2332  * testing the configuration ("--configtest"), all messages go directly
2333  * to the console.
2334  *
2335  * @param Level         Severity level of the message.
2336  * @param Format        Format string; see printf() function.
2337  */
2338 #ifdef PROTOTYPES
2339 static void Config_Error( const int Level, const char *Format, ... )
2340 #else
2341 static void Config_Error( Level, Format, va_alist )
2342 const int Level;
2343 const char *Format;
2344 va_dcl
2345 #endif
2346 {
2347         char msg[MAX_LOG_MSG_LEN];
2348         va_list ap;
2349
2350         assert( Format != NULL );
2351
2352 #ifdef PROTOTYPES
2353         va_start( ap, Format );
2354 #else
2355         va_start( ap );
2356 #endif
2357         vsnprintf( msg, MAX_LOG_MSG_LEN, Format, ap );
2358         va_end( ap );
2359
2360         if (!Use_Log) {
2361                 if (Level <= LOG_WARNING)
2362                         printf(" - %s\n", msg);
2363                 else
2364                         puts(msg);
2365         } else
2366                 Log(Level, "%s", msg);
2367 }
2368
2369 #ifdef DEBUG
2370
2371 /**
2372  * Dump internal state of the "configuration module".
2373  */
2374 GLOBAL void
2375 Conf_DebugDump(void)
2376 {
2377         int i;
2378
2379         Log(LOG_DEBUG, "Configured servers:");
2380         for (i = 0; i < MAX_SERVERS; i++) {
2381                 if (! Conf_Server[i].name[0])
2382                         continue;
2383                 Log(LOG_DEBUG,
2384                     " - %s: %s:%d, last=%ld, group=%d, flags=%d, conn=%d",
2385                     Conf_Server[i].name, Conf_Server[i].host,
2386                     Conf_Server[i].port, Conf_Server[i].lasttry,
2387                     Conf_Server[i].group, Conf_Server[i].flags,
2388                     Conf_Server[i].conn_id);
2389         }
2390 }
2391
2392 #endif
2393
2394 /**
2395  * Initialize server configuration structure to default values.
2396  *
2397  * @param Server        Pointer to server structure to initialize.
2398  */
2399 static void
2400 Init_Server_Struct( CONF_SERVER *Server )
2401 {
2402         assert( Server != NULL );
2403
2404         memset( Server, 0, sizeof (CONF_SERVER) );
2405
2406         Server->group = NONE;
2407         Server->lasttry = time( NULL ) - Conf_ConnectRetry + STARTUP_DELAY;
2408
2409         if( NGIRCd_Passive ) Server->flags = CONF_SFLAG_DISABLED;
2410
2411         Proc_InitStruct(&Server->res_stat);
2412         Server->conn_id = NONE;
2413         memset(&Server->bind_addr, 0, sizeof(Server->bind_addr));
2414 }
2415
2416 /* -eof- */