src/proto-common.c

   1 /* proto-common.c - common IRC protocol parsing/sending support
   2  * Copyright 2000-2004 srvx Development Team
   3  *
   4  * This file is part of srvx.
   5  *
   6  * srvx is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with srvx; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
  19  */
  20
  21 #include "conf.h"
  22 #include "gline.h"
  23 #include "ioset.h"
  24 #include "log.h"
  25 #include "nickserv.h"
  26 #include "timeq.h"
  27 #ifdef HAVE_SYS_SOCKET_H
  28 #include <sys/socket.h>
  29 #endif
  30 #ifdef HAVE_NETINET_IN_H
  31 #include <netinet/in.h>
  32 #endif
  33 #ifdef HAVE_ARPA_INET_H
  34 #include <arpa/inet.h>
  35 #endif
  36
  37 unsigned int lines_processed;
  38 FILE *replay_file;
  39 struct io_fd *socket_io_fd;
  40 int force_n2k;
  41 const char *hidden_host_suffix;
  42
  43 static char replay_line[MAXLEN+80];
  44 static int ping_freq;
  45 static int ping_timeout;
  46 static int replay_connected;
  47 static unsigned int nicklen = NICKLEN; /* how long do we think servers allow nicks to be? */
  48 static struct userList dead_users;
  49
  50 extern struct cManagerNode cManager;
  51 extern unsigned long burst_length;
  52 extern struct cManagerNode cManager;
  53 extern struct policer_params *oper_policer_params, *luser_policer_params;
  54 extern server_link_func_t *slf_list;
  55 extern unsigned int slf_size, slf_used;
  56 extern new_user_func_t *nuf_list;
  57 extern unsigned int nuf_size, nuf_used;
  58 extern del_user_func_t *duf_list;
  59 extern unsigned int duf_size, duf_used;
  60 extern time_t boot_time;
  61
  62 void received_ping(void);
  63
  64 static int replay_read(void);
  65 static dict_t irc_func_dict;
  66
  67 typedef void (*foreach_chanfunc) (struct chanNode *chan, void *data);
  68 typedef void (*foreach_nonchan) (char *name, void *data);
  69 typedef void (*foreach_userfunc) (struct userNode *user, void *data);
  70 typedef void (*foreach_nonuser) (char *name, void *data);
  71 static void parse_foreach(char *target_list, foreach_chanfunc cf, foreach_nonchan nc, foreach_userfunc uf, foreach_nonuser nu, void *data);
  72
  73 static void
  74 uplink_readable(struct io_fd *fd) {
  75     static char buffer[MAXLEN];
  76     char *eol;
  77     int pos;
  78
  79     pos = ioset_line_read(fd, buffer, sizeof(buffer));
  80     if (pos <= 0) {
  81         close_socket();
  82         return;
  83     }
  84     if ((eol = strpbrk(buffer, "\r\n")))
  85         *eol = 0;
  86     log_replay(MAIN_LOG, false, buffer);
  87     if (cManager.uplink->state != DISCONNECTED)
  88         parse_line(buffer, 0);
  89     lines_processed++;
  90 }
  91
  92 void
  93 socket_destroyed(struct io_fd *fd)
  94 {
  95     if (fd && fd->eof)
  96         log_module(MAIN_LOG, LOG_ERROR, "Connection to server lost.");
  97     socket_io_fd = NULL;
  98     cManager.uplink->state = DISCONNECTED;
  99     if (self->uplink)
 100         DelServer(self->uplink, 0, NULL);
 101 }
 102
 103 void replay_event_loop(void)
 104 {
 105     while (!quit_services) {
 106         if (!replay_connected) {
 107             /* this time fudging is to get some of the logging right */
 108             self->link = self->boot = now;
 109             cManager.uplink->state = AUTHENTICATING;
 110             irc_introduce(cManager.uplink->password);
 111             replay_connected = 1;
 112         } else if (!replay_read()) {
 113             log_module(MAIN_LOG, LOG_ERROR, "Connection to server lost.");
 114             close_socket();
 115         }
 116         timeq_run();
 117     }
 118 }
 119
 120 int
 121 create_socket_client(struct uplinkNode *target)
 122 {
 123     int port = target->port;
 124     const char *addr = target->host;
 125
 126     if (replay_file)
 127         return feof(replay_file) ? 0 : 1;
 128
 129     if (socket_io_fd) {
 130         /* Leave the existing socket open, say we failed. */
 131         log_module(MAIN_LOG, LOG_ERROR, "Refusing to create second connection to %s:%d.", addr, port);
 132         return 0;
 133     }
 134
 135     log_module(MAIN_LOG, LOG_INFO, "Connecting to %s:%i...", addr, port);
 136
 137     socket_io_fd = ioset_connect((struct sockaddr*)cManager.uplink->bind_addr, sizeof(struct sockaddr), addr, port, 1, 0, NULL);
 138     if (!socket_io_fd) {
 139         log_module(MAIN_LOG, LOG_ERROR, "Connection to uplink failed: %s (%d)", strerror(errno), errno);
 140         target->state = DISCONNECTED;
 141         target->tries++;
 142         return 0;
 143     }
 144     socket_io_fd->readable_cb = uplink_readable;
 145     socket_io_fd->destroy_cb = socket_destroyed;
 146     socket_io_fd->line_reads = 1;
 147     socket_io_fd->wants_reads = 1;
 148     log_module(MAIN_LOG, LOG_INFO, "Connection to server established.");
 149     cManager.uplink = target;
 150     target->state = AUTHENTICATING;
 151     target->tries = 0;
 152     return 1;
 153 }
 154
 155 void
 156 replay_read_line(void)
 157 {
 158     struct tm timestamp;
 159     time_t new_time;
 160
 161     if (replay_line[0]) return;
 162   read_line:
 163     if (!fgets(replay_line, sizeof(replay_line), replay_file)) {
 164         if (feof(replay_file)) {
 165             quit_services = 1;
 166             memset(replay_line, 0, sizeof(replay_line));
 167             return;
 168         }
 169     }
 170     if ((replay_line[0] != '[')
 171         || (replay_line[3] != ':')
 172         || (replay_line[6] != ':')
 173         || (replay_line[9] != ' ')
 174         || (replay_line[12] != '/')
 175         || (replay_line[15] != '/')
 176         || (replay_line[20] != ']')
 177         || (replay_line[21] != ' ')) {
 178         log_module(MAIN_LOG, LOG_ERROR, "Unrecognized timestamp in replay file: %s", replay_line);
 179         goto read_line;
 180     }
 181     timestamp.tm_hour = strtoul(replay_line+1, NULL, 10);
 182     timestamp.tm_min = strtoul(replay_line+4, NULL, 10);
 183     timestamp.tm_sec = strtoul(replay_line+7, NULL, 10);
 184     timestamp.tm_mon = strtoul(replay_line+10, NULL, 10) - 1;
 185     timestamp.tm_mday = strtoul(replay_line+13, NULL, 10);
 186     timestamp.tm_year = strtoul(replay_line+16, NULL, 10) - 1900;
 187     timestamp.tm_isdst = 0;
 188     new_time = mktime(&timestamp);
 189     if (new_time == -1) {
 190         log_module(MAIN_LOG, LOG_ERROR, "Unable to parse time struct tm_sec=%d tm_min=%d tm_hour=%d tm_mday=%d tm_mon=%d tm_year=%d", timestamp.tm_sec, timestamp.tm_min, timestamp.tm_hour, timestamp.tm_mday, timestamp.tm_mon, timestamp.tm_year);
 191     } else {
 192         now = new_time;
 193     }
 194
 195     if (strncmp(replay_line+22, "(info) ", 7))
 196         goto read_line;
 197     return;
 198 }
 199
 200 static int
 201 replay_read(void)
 202 {
 203     size_t len;
 204     char read_line[MAXLEN];
 205     while (1) {
 206         replay_read_line();
 207         /* if it's a sent line, break out to handle it */
 208         if (!strncmp(replay_line+29, "   ", 3))
 209             break;
 210         if (!strncmp(replay_line+29, "W: ", 3)) {
 211             log_module(MAIN_LOG, LOG_ERROR, "Expected response from services: %s", replay_line+32);
 212             replay_line[0] = 0;
 213         } else {
 214             return 0;
 215         }
 216     }
 217     log_replay(MAIN_LOG, false, replay_line+32);
 218     safestrncpy(read_line, replay_line+32, sizeof(read_line));
 219     len = strlen(read_line);
 220     if (read_line[len-1] == '\n')
 221         read_line[--len] = 0;
 222     replay_line[0] = 0;
 223     parse_line(read_line, 0);
 224     lines_processed++;
 225     return 1;
 226 }
 227
 228 static void
 229 replay_write(char *text)
 230 {
 231     replay_read_line();
 232     if (strncmp(replay_line+29, "W: ", 3)) {
 233         log_module(MAIN_LOG, LOG_ERROR, "Unexpected output during replay: %s", text);
 234         return;
 235     } else {
 236         if (strcmp(replay_line+32, text)) {
 237             log_module(MAIN_LOG, LOG_ERROR, "Incorrect output during replay:\nReceived: %sExpected: %s", text, replay_line+32);
 238         } else {
 239             log_replay(MAIN_LOG, true, text);
 240         }
 241         replay_line[0] = 0;
 242     }
 243 }
 244
 245 void putsock(const char *text, ...) PRINTF_LIKE(1, 2);
 246
 247 void
 248 putsock(const char *text, ...)
 249 {
 250     va_list arg_list;
 251     char buffer[MAXLEN];
 252     int pos;
 253
 254     if (!cManager.uplink || cManager.uplink->state == DISCONNECTED) return;
 255     buffer[0] = '\0';
 256     va_start(arg_list, text);
 257     pos = vsnprintf(buffer, MAXLEN - 2, text, arg_list);
 258     va_end(arg_list);
 259     if (pos < 0 || pos > (MAXLEN - 2)) pos = MAXLEN - 2;
 260     buffer[pos] = 0;
 261     if (!replay_file) {
 262         log_replay(MAIN_LOG, true, buffer);
 263         buffer[pos++] = '\n';
 264         buffer[pos] = 0;
 265         ioset_write(socket_io_fd, buffer, pos);
 266     } else {
 267         replay_write(buffer);
 268     }
 269 }
 270
 271 void
 272 close_socket(void)
 273 {
 274     if (replay_file) {
 275         replay_connected = 0;
 276         socket_destroyed(socket_io_fd);
 277     } else {
 278         ioset_close(socket_io_fd->fd, 1);
 279     }
 280 }
 281
 282 #define CMD_FUNC(NAME) int NAME(UNUSED_ARG(const char *origin), UNUSED_ARG(unsigned int argc), UNUSED_ARG(char **argv))
 283 typedef CMD_FUNC(cmd_func_t);
 284
 285 static void timed_ping_timeout(void *data);
 286
 287 /* Ping state is kept in the timeq (only one of these two can be in
 288  * the queue at any given time). */
 289 void
 290 timed_send_ping(UNUSED_ARG(void *data))
 291 {
 292     irc_ping(self->name);
 293     timeq_add(now + ping_timeout, timed_ping_timeout, 0);
 294 }
 295
 296 static void
 297 timed_ping_timeout(UNUSED_ARG(void *data))
 298 {
 299     /* Uplink "health" tracking could be accomplished by counting the
 300        number of ping timeouts that happen for each uplink. After the
 301        timeouts per time period exceeds some amount, the uplink could
 302        be marked as unavalable.*/
 303     irc_squit(self, "Ping timeout.", NULL);
 304 }
 305
 306 static CMD_FUNC(cmd_pass)
 307 {
 308     const char *true_pass;
 309
 310     if (argc < 2)
 311         return 0;
 312     true_pass = cManager.uplink->their_password;
 313     if (true_pass && strcmp(true_pass, argv[1])) {
 314         /* It might be good to mark the uplink as unavailable when
 315            this happens, though there should be a way of resetting
 316            the flag. */
 317         irc_squit(self, "Incorrect password received.", NULL);
 318         return 1;
 319     }
 320
 321     cManager.uplink->state = BURSTING;
 322     return 1;
 323 }
 324
 325 static CMD_FUNC(cmd_dummy)
 326 {
 327     /* we don't care about these messages */
 328     return 1;
 329 }
 330
 331 static CMD_FUNC(cmd_error)
 332 {
 333     if (argv[1]) log_module(MAIN_LOG, LOG_ERROR, "Error: %s", argv[1]);
 334     log_module(MAIN_LOG, LOG_ERROR, "Error received from uplink, squitting.");
 335
 336     if (cManager.uplink->state != CONNECTED) {
 337         /* Error messages while connected should be fine. */
 338         cManager.uplink->flags |= UPLINK_UNAVAILABLE;
 339         log_module(MAIN_LOG, LOG_ERROR, "Disabling uplink.");
 340     }
 341
 342     close_socket();
 343     return 1;
 344 }
 345
 346 static CMD_FUNC(cmd_stats)
 347 {
 348     struct userNode *un;
 349
 350     if (argc < 2)
 351         return 0;
 352     if (!(un = GetUserH(origin)))
 353         return 0;
 354     switch (argv[1][0]) {
 355     case 'u': {
 356         unsigned int uptime = now - boot_time;
 357         irc_numeric(un, RPL_STATSUPTIME, ":Server Up %d days %d:%02d:%02d",
 358                     uptime/(24*60*60), (uptime/(60*60))%24, (uptime/60)%60, uptime%60);
 359         irc_numeric(un, RPL_MAXCONNECTIONS, ":Highest connection count: %d (%d clients)",
 360                     self->max_clients+1, self->max_clients);
 361         break;
 362     }
 363     default: /* unrecognized/unhandled stats output */ break;
 364     }
 365     irc_numeric(un, 219, "%s :End of /STATS report", argv[1]);
 366     return 1;
 367 }
 368
 369 static CMD_FUNC(cmd_version)
 370 {
 371     struct userNode *user;
 372     if (!(user = GetUserH(origin))) {
 373         log_module(MAIN_LOG, LOG_ERROR, "Could not find VERSION origin user %s", origin);
 374         return 0;
 375     }
 376     irc_numeric(user, 351, "%s.%s %s :%s", PACKAGE_TARNAME, PACKAGE_VERSION, self->name, CODENAME);
 377     return 1;
 378 }
 379
 380 static CMD_FUNC(cmd_admin)
 381 {
 382     struct userNode *user;
 383     struct string_list *slist;
 384
 385     if (!(user = GetUserH(origin))) {
 386         log_module(MAIN_LOG, LOG_ERROR, "Could not find ADMIN origin user %s", origin);
 387         return 0;
 388     }
 389     if ((slist = conf_get_data("server/admin", RECDB_STRING_LIST)) && slist->used) {
 390         unsigned int i;
 391
 392         irc_numeric(user, 256, ":Administrative info about %s", self->name);
 393         for (i = 0; i < slist->used && i < 3; i++)
 394             irc_numeric(user, 257 + i, ":%s", slist->list[i]);
 395     } else {
 396         irc_numeric(user, 423, ":No administrative info available");
 397     }
 398     return 1;
 399 }
 400
 401 static void
 402 recalc_bursts(struct server *eob_server)
 403 {
 404     unsigned int nn;
 405     eob_server->burst = eob_server->self_burst;
 406     if (eob_server->uplink != self)
 407         eob_server->burst = eob_server->burst || eob_server->uplink->burst;
 408     for (nn=0; nn < eob_server->children.used; nn++)
 409         recalc_bursts(eob_server->children.list[nn]);
 410 }
 411
 412 static struct chanmsg_func {
 413     chanmsg_func_t func;
 414     struct userNode *service;
 415 } chanmsg_funcs[256]; /* indexed by trigger character */
 416
 417 static struct allchanmsg_func {
 418     chanmsg_func_t func;
 419     struct userNode *service;
 420 } allchanmsg_funcs[ALLCHANMSG_FUNCS_MAX];
 421
 422 struct privmsg_desc {
 423     struct userNode *user;
 424     char *text;
 425     unsigned int is_notice : 1;
 426     unsigned int is_qualified : 1;
 427 };
 428
 429 static void
 430 privmsg_chan_helper(struct chanNode *cn, void *data)
 431 {
 432     struct privmsg_desc *pd = data;
 433     struct modeNode *mn;
 434     struct chanmsg_func *cf = &chanmsg_funcs[(unsigned char)pd->text[0]];
 435     int x;
 436
 437     /* Don't complain if it can't find the modeNode because the channel might
 438      * be -n */
 439     if ((mn = GetUserMode(cn, pd->user)))
 440         mn->idle_since = now;
 441
 442     /* Never send a NOTICE to a channel to one of the services */
 443     if (!pd->is_notice && cf->func && GetUserMode(cn, cf->service))
 444         cf->func(pd->user, cn, pd->text+1, cf->service);
 445
 446     /* This catches *all* text sent to the channel that the services server sees */
 447     for (x = 0; x < ALLCHANMSG_FUNCS_MAX; x++) {
 448        cf = (struct chanmsg_func *)&allchanmsg_funcs[x];
 449        if (!cf->func)
 450          break; /* end of list */
 451        else
 452        cf->func(pd->user, cn, pd->text, cf->service);
 453     }
 454 }
 455
 456 static void
 457 privmsg_invalid(char *name, void *data)
 458 {
 459     struct privmsg_desc *pd = data;
 460
 461     if (*name == '$')
 462         return;
 463     irc_numeric(pd->user, ERR_NOSUCHNICK, "%s@%s :No such nick", name, self->name);
 464 }
 465
 466 static void
 467 part_helper(struct chanNode *cn, void *data)
 468 {
 469     DelChannelUser(data, cn, false, 0);
 470 }
 471
 472 void
 473 reg_chanmsg_func(unsigned char prefix, struct userNode *service, chanmsg_func_t handler)
 474 {
 475     if (chanmsg_funcs[prefix].func)
 476         log_module(MAIN_LOG, LOG_WARNING, "Re-registering new chanmsg handler for character `%c'.", prefix);
 477     chanmsg_funcs[prefix].func = handler;
 478     chanmsg_funcs[prefix].service = service;
 479 }
 480
 481 void
 482 reg_allchanmsg_func(struct userNode *service, chanmsg_func_t handler)
 483 {
 484     int x;
 485     for (x = 0; x < ALLCHANMSG_FUNCS_MAX; x++) {
 486        if (allchanmsg_funcs[x].func)
 487          continue;
 488        allchanmsg_funcs[x].func = handler;
 489        allchanmsg_funcs[x].service = service;
 490        break;
 491     }
 492 }
 493
 494 struct userNode *
 495 get_chanmsg_bot(unsigned char prefix)
 496 {
 497     return chanmsg_funcs[prefix].service;
 498 }
 499
 500 static mode_change_func_t *mcf_list;
 501 static unsigned int mcf_size = 0, mcf_used = 0;
 502
 503 void
 504 reg_mode_change_func(mode_change_func_t handler)
 505 {
 506     if (mcf_used == mcf_size) {
 507         if (mcf_size) {
 508             mcf_size <<= 1;
 509             mcf_list = realloc(mcf_list, mcf_size*sizeof(mode_change_func_t));
 510         } else {
 511             mcf_size = 8;
 512             mcf_list = malloc(mcf_size*sizeof(mode_change_func_t));
 513         }
 514     }
 515     mcf_list[mcf_used++] = handler;
 516 }
 517
 518 struct mod_chanmode *
 519 mod_chanmode_alloc(unsigned int argc)
 520 {
 521     struct mod_chanmode *res;
 522     if (argc > 1)
 523         res = calloc(1, sizeof(*res) + (argc-1)*sizeof(res->args[0]));
 524     else
 525         res = calloc(1, sizeof(*res));
 526     if (res) {
 527 #if !defined(NDEBUG)
 528         res->alloc_argc = argc;
 529 #endif
 530         res->argc = argc;
 531     }
 532     return res;
 533 }
 534
 535 struct mod_chanmode *
 536 mod_chanmode_dup(struct mod_chanmode *orig, unsigned int extra)
 537 {
 538     struct mod_chanmode *res;
 539     res = mod_chanmode_alloc(orig->argc + extra);
 540     if (res) {
 541         res->modes_set = orig->modes_set;
 542         res->modes_clear = orig->modes_clear;
 543         res->new_limit = orig->new_limit;
 544         memcpy(res->new_key, orig->new_key, sizeof(res->new_key));
 545         res->argc = orig->argc;
 546         memcpy(res->args, orig->args, orig->argc*sizeof(orig->args[0]));
 547     }
 548     return res;
 549 }
 550
 551 void
 552 mod_chanmode_apply(struct userNode *who, struct chanNode *channel, struct mod_chanmode *change)
 553 {
 554     struct banNode *bn;
 555     unsigned int ii, jj;
 556
 557     assert(change->argc <= change->alloc_argc);
 558     channel->modes = (channel->modes & ~change->modes_clear) | change->modes_set;
 559     if (change->modes_set & MODE_LIMIT)
 560         channel->limit = change->new_limit;
 561     if (change->modes_set & MODE_KEY)
 562         strcpy(channel->key, change->new_key);
 563     for (ii = 0; ii < change->argc; ++ii) {
 564         switch (change->args[ii].mode) {
 565         case MODE_BAN:
 566             /* If any existing ban is a subset of the new ban,
 567              * silently remove it.  The new ban is not allowed
 568              * to be more specific than an existing ban.
 569              */
 570             for (jj=0; jj<channel->banlist.used; ++jj) {
 571                 if (match_ircglobs(change->args[ii].hostmask, channel->banlist.list[jj]->ban)) {
 572                     banList_remove(&channel->banlist, channel->banlist.list[jj]);
 573                     free(channel->banlist.list[jj]);
 574                     jj--;
 575                 }
 576             }
 577             bn = calloc(1, sizeof(*bn));
 578             safestrncpy(bn->ban, change->args[ii].hostmask, sizeof(bn->ban));
 579             if (who)
 580                 safestrncpy(bn->who, who->nick, sizeof(bn->who));
 581             else
 582                 safestrncpy(bn->who, "<unknown>", sizeof(bn->who));
 583             bn->set = now;
 584             banList_append(&channel->banlist, bn);
 585             break;
 586         case MODE_REMOVE|MODE_BAN:
 587             for (jj=0; jj<channel->banlist.used; ++jj) {
 588                 if (strcmp(channel->banlist.list[jj]->ban, change->args[ii].hostmask))
 589                     continue;
 590                 free(channel->banlist.list[jj]);
 591                 banList_remove(&channel->banlist, channel->banlist.list[jj]);
 592                 break;
 593             }
 594             break;
 595         case MODE_CHANOP:
 596         case MODE_HALFOP:
 597         case MODE_VOICE:
 598         case MODE_VOICE|MODE_CHANOP|MODE_HALFOP:
 599         case MODE_REMOVE|MODE_CHANOP:
 600         case MODE_REMOVE|MODE_HALFOP:
 601         case MODE_REMOVE|MODE_VOICE:
 602         case MODE_REMOVE|MODE_VOICE|MODE_CHANOP|MODE_HALFOP:
 603             if (change->args[ii].mode & MODE_REMOVE)
 604                 change->args[ii].member->modes &= ~change->args[ii].mode;
 605             else
 606                 change->args[ii].member->modes |= change->args[ii].mode;
 607             break;
 608         default:
 609             assert(0 && "Invalid mode argument");
 610             continue;
 611         }
 612     }
 613 }
 614
 615 void
 616 mod_chanmode_free(struct mod_chanmode *change)
 617 {
 618     free(change);
 619 }
 620
 621 int
 622 mod_chanmode(struct userNode *who, struct chanNode *channel, char **modes, unsigned int argc, unsigned int flags)
 623 {
 624     struct mod_chanmode *change;
 625     unsigned int ii;
 626
 627     if (!modes || !modes[0])
 628         return 0;
 629     if (!(change = mod_chanmode_parse(channel, modes, argc, flags)))
 630         return 0;
 631     if (flags & MC_ANNOUNCE)
 632         mod_chanmode_announce(who, channel, change);
 633     else
 634         mod_chanmode_apply(who, channel, change);
 635     if (flags & MC_NOTIFY)
 636         for (ii = 0; ii < mcf_used; ++ii)
 637             mcf_list[ii](channel, who, change);
 638     mod_chanmode_free(change);
 639     return 1;
 640 }
 641
 642 int
 643 irc_make_chanmode(struct chanNode *chan, char *out) {
 644     struct mod_chanmode change;
 645     mod_chanmode_init(&change);
 646     change.modes_set = chan->modes;
 647     change.new_limit = chan->limit;
 648     safestrncpy(change.new_key, chan->key, sizeof(change.new_key));
 649     return strlen(mod_chanmode_format(&change, out));
 650 }
 651
 652 char *
 653 generate_hostmask(struct userNode *user, int options)
 654 {
 655     char *nickname, *ident, *hostname;
 656     char *mask;
 657     int len, ii;
 658
 659     /* figure out string parts */
 660     if (options & GENMASK_OMITNICK)
 661         nickname = NULL;
 662     else if (options & GENMASK_USENICK)
 663         nickname = user->nick;
 664     else
 665         nickname = "*";
 666     if (options & GENMASK_STRICT_IDENT)
 667         // sethost - reed/apples
 668         if (IsSetHost(user)) {
 669           ident = alloca(strcspn(user->sethost, "@")+2);
 670           safestrncpy(ident, user->sethost, strcspn(user->sethost, "@")+1);
 671         }
 672         else
 673         ident = user->ident;
 674     else if (options & GENMASK_ANY_IDENT)
 675         ident = "*";
 676     else {
 677         // sethost - reed/apples
 678         if (IsSetHost(user)) {
 679           ident = alloca(strcspn(user->sethost, "@")+3);
 680           ident[0] = '*';
 681           safestrncpy(ident+1, user->sethost, strcspn(user->sethost, "@")+1);
 682         } else {
 683         ident = alloca(strlen(user->ident)+2);
 684         ident[0] = '*';
 685         strcpy(ident+1, user->ident + ((*user->ident == '~')?1:0));
 686     }
 687     }
 688     hostname = user->hostname;
 689     if (IsFakeHost(user) && IsHiddenHost(user) && !(options & GENMASK_NO_HIDING)) {
 690         hostname = user->fakehost;
 691     } else if (IsHiddenHost(user) && user->handle_info && hidden_host_suffix && !(options & GENMASK_NO_HIDING)) {
 692         hostname = alloca(strlen(user->handle_info->handle) + strlen(hidden_host_suffix) + 2);
 693         sprintf(hostname, "%s.%s", user->handle_info->handle, hidden_host_suffix);
 694     } else if (options & GENMASK_STRICT_HOST) {
 695         if (options & GENMASK_BYIP)
 696             hostname = inet_ntoa(user->ip);
 697     } else if ((options & GENMASK_BYIP) || !hostname[strspn(hostname, "0123456789.")]) {
 698         /* Should generate an IP-based hostmask.  By popular acclaim, a /16
 699          * hostmask is used by default. */
 700         unsigned masked_ip, mask, masklen;
 701         masklen = 16;
 702         mask = ~0 << masklen;
 703         masked_ip = ntohl(user->ip.s_addr) & mask;
 704         hostname = alloca(32);
 705         if (options & GENMASK_SRVXMASK) {
 706             sprintf(hostname, "%d.%d.%d.%d/%d", (masked_ip>>24)&0xFF, (masked_ip>>16)&0xFF, (masked_ip>>8)&0xFF, masked_ip&0xFF, masklen);
 707         } else {
 708             int ofs = 0;
 709             for (ii=0; ii<4; ii++) {
 710                 if (masklen) {
 711                     ofs += sprintf(hostname+ofs, "%d.", (masked_ip>>24)&0xFF);
 712                     masklen -= 8;
 713                     masked_ip <<= 8;
 714                 } else {
 715                     ofs += sprintf(hostname+ofs, "*.");
 716                 }
 717             }
 718             /* Truncate the last . */
 719             hostname[ofs-1] = 0;
 720         }
 721     } else {
 722         int cnt;
 723         /* This heuristic could be made smarter.  Is it worth the effort? */
 724         for (ii=cnt=0; hostname[ii]; ii++)
 725             if (hostname[ii] == '.')
 726                 cnt++;
 727         if (cnt == 1) {
 728             /* only a two-level domain name; leave hostname */
 729         } else if (cnt == 2) {
 730             for (ii=0; user->hostname[ii] != '.'; ii++) ;
 731             /* Add 3 to account for the *. and \0. */
 732             hostname = alloca(strlen(user->hostname+ii)+3);
 733             sprintf(hostname, "*.%s", user->hostname+ii+1);
 734         } else {
 735             for (cnt=3, ii--; cnt; ii--)
 736                 if (user->hostname[ii] == '.')
 737                     cnt--;
 738             /* The loop above will overshoot the dot one character;
 739                we skip forward two (the one character and the dot)
 740                when printing, so we only add one for the \0. */
 741             hostname = alloca(strlen(user->hostname+ii)+1);
 742             sprintf(hostname, "*.%s", user->hostname+ii+2);
 743         }
 744     }
 745     // sethost - reed/apples
 746     if (IsSetHost(user))
 747       hostname = strchr(user->sethost, '@') + 1;
 748
 749     /* Emit hostmask */
 750     len = strlen(ident) + strlen(hostname) + 2;
 751     if (nickname) {
 752         len += strlen(nickname) + 1;
 753         mask = malloc(len);
 754         sprintf(mask, "%s!%s@%s", nickname, ident, hostname);
 755     } else {
 756         mask = malloc(len);
 757         sprintf(mask, "%s@%s", ident, hostname);
 758     }
 759     return mask;
 760 }
 761
 762 int
 763 IsChannelName(const char *name) {
 764     unsigned int ii;
 765
 766     if (*name !='#')
 767         return 0;
 768     for (ii=1; name[ii]; ++ii) {
 769         if ((name[ii] > 0) && (name[ii] <= 32))
 770             return 0;
 771         if (name[ii] == ',')
 772             return 0;
 773         if (name[ii] == '\xa0')
 774             return 0;
 775     }
 776     return 1;
 777 }