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
 444         && ((cn->modes & MODE_REGISTERED) || GetUserMode(cn, cf->service)))
 445          cf->func(pd->user, cn, pd->text+1, cf->service);
 446
 447     /* This catches *all* text sent to the channel that the services server sees */
 448     for (x = 0; x < ALLCHANMSG_FUNCS_MAX; x++) {
 449        cf = (struct chanmsg_func *)&allchanmsg_funcs[x];
 450        if (!cf->func)
 451          break; /* end of list */
 452        else
 453          cf->func(pd->user, cn, pd->text, cf->service);
 454     }
 455 }
 456
 457 static void
 458 privmsg_invalid(char *name, void *data)
 459 {
 460     struct privmsg_desc *pd = data;
 461
 462     if (*name == '$')
 463         return;
 464     irc_numeric(pd->user, ERR_NOSUCHNICK, "%s@%s :No such nick", name, self->name);
 465 }
 466
 467 static void
 468 part_helper(struct chanNode *cn, void *data)
 469 {
 470     DelChannelUser(data, cn, false, 0);
 471 }
 472
 473 void
 474 reg_chanmsg_func(unsigned char prefix, struct userNode *service, chanmsg_func_t handler)
 475 {
 476     if (chanmsg_funcs[prefix].func)
 477         log_module(MAIN_LOG, LOG_WARNING, "Re-registering new chanmsg handler for character `%c'.", prefix);
 478     chanmsg_funcs[prefix].func = handler;
 479     chanmsg_funcs[prefix].service = service;
 480 }
 481
 482 void
 483 reg_allchanmsg_func(struct userNode *service, chanmsg_func_t handler)
 484 {
 485     int x;
 486     for (x = 0; x < ALLCHANMSG_FUNCS_MAX; x++) {
 487        if (allchanmsg_funcs[x].func)
 488          continue;
 489        allchanmsg_funcs[x].func = handler;
 490        allchanmsg_funcs[x].service = service;
 491        break;
 492     }
 493 }
 494
 495 struct userNode *
 496 get_chanmsg_bot(unsigned char prefix)
 497 {
 498     return chanmsg_funcs[prefix].service;
 499 }
 500
 501 static mode_change_func_t *mcf_list;
 502 static unsigned int mcf_size = 0, mcf_used = 0;
 503
 504 void
 505 reg_mode_change_func(mode_change_func_t handler)
 506 {
 507     if (mcf_used == mcf_size) {
 508         if (mcf_size) {
 509             mcf_size <<= 1;
 510             mcf_list = realloc(mcf_list, mcf_size*sizeof(mode_change_func_t));
 511         } else {
 512             mcf_size = 8;
 513             mcf_list = malloc(mcf_size*sizeof(mode_change_func_t));
 514         }
 515     }
 516     mcf_list[mcf_used++] = handler;
 517 }
 518
 519 struct mod_chanmode *
 520 mod_chanmode_alloc(unsigned int argc)
 521 {
 522     struct mod_chanmode *res;
 523     if (argc > 1)
 524         res = calloc(1, sizeof(*res) + (argc-1)*sizeof(res->args[0]));
 525     else
 526         res = calloc(1, sizeof(*res));
 527     if (res) {
 528 #if !defined(NDEBUG)
 529         res->alloc_argc = argc;
 530 #endif
 531         res->argc = argc;
 532     }
 533     return res;
 534 }
 535
 536 struct mod_chanmode *
 537 mod_chanmode_dup(struct mod_chanmode *orig, unsigned int extra)
 538 {
 539     struct mod_chanmode *res;
 540     res = mod_chanmode_alloc(orig->argc + extra);
 541     if (res) {
 542         res->modes_set = orig->modes_set;
 543         res->modes_clear = orig->modes_clear;
 544         res->new_limit = orig->new_limit;
 545         memcpy(res->new_key, orig->new_key, sizeof(res->new_key));
 546         res->argc = orig->argc;
 547         memcpy(res->args, orig->args, orig->argc*sizeof(orig->args[0]));
 548     }
 549     return res;
 550 }
 551
 552 void
 553 mod_chanmode_apply(struct userNode *who, struct chanNode *channel, struct mod_chanmode *change)
 554 {
 555     struct banNode *bn;
 556     struct exemptNode *en;
 557     unsigned int ii, jj;
 558
 559     assert(change->argc <= change->alloc_argc);
 560     channel->modes = (channel->modes & ~change->modes_clear) | change->modes_set;
 561     if (change->modes_set & MODE_LIMIT)
 562         channel->limit = change->new_limit;
 563     if (change->modes_set & MODE_KEY)
 564         strcpy(channel->key, change->new_key);
 565     for (ii = 0; ii < change->argc; ++ii) {
 566         switch (change->args[ii].mode) {
 567         case MODE_BAN:
 568             /* If any existing ban is a subset of the new ban,
 569              * silently remove it.  The new ban is not allowed
 570              * to be more specific than an existing ban.
 571              */
 572             for (jj=0; jj<channel->banlist.used; ++jj) {
 573                 bn = channel->banlist.list[jj];
 574                 if (match_ircglobs(change->args[ii].u.hostmask, bn->ban)) {
 575                     banList_remove(&channel->banlist, bn);
 576                     free(bn);
 577                     jj--;
 578                 }
 579             }
 580             bn = calloc(1, sizeof(*bn));
 581             safestrncpy(bn->ban, change->args[ii].u.hostmask, sizeof(bn->ban));
 582             if (who)
 583                 safestrncpy(bn->who, who->nick, sizeof(bn->who));
 584             else
 585                 safestrncpy(bn->who, "<unknown>", sizeof(bn->who));
 586             bn->set = now;
 587             banList_append(&channel->banlist, bn);
 588             break;
 589         case MODE_REMOVE|MODE_BAN:
 590             for (jj=0; jj<channel->banlist.used; ++jj) {
 591                 bn = channel->banlist.list[jj];
 592                 if (strcmp(bn->ban, change->args[ii].u.hostmask))
 593                     continue;
 594                 free(bn);
 595                 banList_remove(&channel->banlist, bn);
 596                 break;
 597             }
 598             break;
 599         case MODE_EXEMPT:
 600             /* If any existing exempt is a subset of the new exempt,
 601              * silently remove it.  The new exempt is not allowed
 602              * to be more specific than an existing exempt.
 603              */
 604             for (jj=0; jj<channel->exemptlist.used; ++jj) {
 605                 if (match_ircglobs(change->args[ii].u.hostmask, channel->exemptlist.list[jj]->exempt)) {
 606                     exemptList_remove(&channel->exemptlist, channel->exemptlist.list[jj]);
 607                     free(channel->exemptlist.list[jj]);
 608                     jj--;
 609                 }
 610             }
 611             en = calloc(1, sizeof(*en));
 612             safestrncpy(en->exempt, change->args[ii].u.hostmask, sizeof(en->exempt));
 613             if (who)
 614                 safestrncpy(en->who, who->nick, sizeof(en->who));
 615             else
 616                 safestrncpy(en->who, "<unknown>", sizeof(en->who));
 617             en->set = now;
 618             exemptList_append(&channel->exemptlist, en);
 619             break;
 620         case MODE_REMOVE|MODE_EXEMPT:
 621             for (jj=0; jj<channel->exemptlist.used; ++jj) {
 622                 if (strcmp(channel->exemptlist.list[jj]->exempt, change->args[ii].u.hostmask))
 623                     continue;
 624                 free(channel->exemptlist.list[jj]);
 625                 exemptList_remove(&channel->exemptlist, channel->exemptlist.list[jj]);
 626                 break;
 627             }
 628             break;
 629         case MODE_CHANOP:
 630         case MODE_HALFOP:
 631         case MODE_VOICE:
 632         case MODE_VOICE|MODE_CHANOP|MODE_HALFOP:
 633         case MODE_REMOVE|MODE_CHANOP:
 634         case MODE_REMOVE|MODE_HALFOP:
 635         case MODE_REMOVE|MODE_VOICE:
 636         case MODE_REMOVE|MODE_VOICE|MODE_CHANOP|MODE_HALFOP:
 637             if (change->args[ii].mode & MODE_REMOVE)
 638                 change->args[ii].u.member->modes &= ~change->args[ii].mode;
 639             else
 640                 change->args[ii].u.member->modes |= change->args[ii].mode;
 641             break;
 642         default:
 643             assert(0 && "Invalid mode argument");
 644             continue;
 645         }
 646     }
 647 }
 648
 649 void
 650 mod_chanmode_free(struct mod_chanmode *change)
 651 {
 652     free(change);
 653 }
 654
 655 int
 656 mod_chanmode(struct userNode *who, struct chanNode *channel, char **modes, unsigned int argc, unsigned int flags)
 657 {
 658     struct mod_chanmode *change;
 659     unsigned int ii;
 660
 661     if (!modes || !modes[0])
 662         return 0;
 663     if (!(change = mod_chanmode_parse(channel, modes, argc, flags)))
 664         return 0;
 665     if (flags & MC_ANNOUNCE)
 666         mod_chanmode_announce(who, channel, change);
 667     else
 668         mod_chanmode_apply(who, channel, change);
 669     if (flags & MC_NOTIFY)
 670         for (ii = 0; ii < mcf_used; ++ii)
 671             mcf_list[ii](channel, who, change);
 672     mod_chanmode_free(change);
 673     return 1;
 674 }
 675
 676 int
 677 irc_make_chanmode(struct chanNode *chan, char *out)
 678 {
 679     struct mod_chanmode change;
 680     mod_chanmode_init(&change);
 681     change.modes_set = chan->modes;
 682     change.new_limit = chan->limit;
 683     safestrncpy(change.new_key, chan->key, sizeof(change.new_key));
 684     return strlen(mod_chanmode_format(&change, out));
 685 }
 686
 687 char *
 688 generate_hostmask(struct userNode *user, int options)
 689 {
 690     char *nickname, *ident, *hostname;
 691     char *mask;
 692     int len, ii;
 693
 694     /* figure out string parts */
 695     if (options & GENMASK_OMITNICK)
 696         nickname = NULL;
 697     else if (options & GENMASK_USENICK)
 698         nickname = user->nick;
 699     else
 700         nickname = "*";
 701     if (options & GENMASK_STRICT_IDENT)
 702         // sethost - reed/apples
 703         if (IsSetHost(user)) {
 704           ident = alloca(strcspn(user->sethost, "@")+2);
 705           safestrncpy(ident, user->sethost, strcspn(user->sethost, "@")+1);
 706         }
 707         else
 708         ident = user->ident;
 709     else if (options & GENMASK_ANY_IDENT)
 710         ident = "*";
 711     else {
 712         // sethost - reed/apples
 713         if (IsSetHost(user)) {
 714           ident = alloca(strcspn(user->sethost, "@")+3);
 715           ident[0] = '*';
 716           safestrncpy(ident+1, user->sethost, strcspn(user->sethost, "@")+1);
 717         } else {
 718         ident = alloca(strlen(user->ident)+2);
 719         ident[0] = '*';
 720         strcpy(ident+1, user->ident + ((*user->ident == '~')?1:0));
 721     }
 722     }
 723     hostname = user->hostname;
 724     if (IsFakeHost(user) && IsHiddenHost(user) && !(options & GENMASK_NO_HIDING)) {
 725         hostname = user->fakehost;
 726     } else if (IsHiddenHost(user) && user->handle_info && hidden_host_suffix && !(options & GENMASK_NO_HIDING)) {
 727         hostname = alloca(strlen(user->handle_info->handle) + strlen(hidden_host_suffix) + 2);
 728         sprintf(hostname, "%s.%s", user->handle_info->handle, hidden_host_suffix);
 729     } else if (options & GENMASK_STRICT_HOST) {
 730         if (options & GENMASK_BYIP)
 731             hostname = inet_ntoa(user->ip);
 732     } else if ((options & GENMASK_BYIP) || !hostname[strspn(hostname, "0123456789.")]) {
 733         /* Should generate an IP-based hostmask.  By popular acclaim, a /16
 734          * hostmask is used by default. */
 735         unsigned masked_ip, mask, masklen;
 736         masklen = 16;
 737         mask = ~0 << masklen;
 738         masked_ip = ntohl(user->ip.s_addr) & mask;
 739         hostname = alloca(32);
 740         if (options & GENMASK_SRVXMASK) {
 741             sprintf(hostname, "%d.%d.%d.%d/%d", (masked_ip>>24)&0xFF, (masked_ip>>16)&0xFF, (masked_ip>>8)&0xFF, masked_ip&0xFF, masklen);
 742         } else {
 743             int ofs = 0;
 744             for (ii=0; ii<4; ii++) {
 745                 if (masklen) {
 746                     ofs += sprintf(hostname+ofs, "%d.", (masked_ip>>24)&0xFF);
 747                     masklen -= 8;
 748                     masked_ip <<= 8;
 749                 } else {
 750                     ofs += sprintf(hostname+ofs, "*.");
 751                 }
 752             }
 753             /* Truncate the last . */
 754             hostname[ofs-1] = 0;
 755         }
 756     } else {
 757         int cnt;
 758         /* This heuristic could be made smarter.  Is it worth the effort? */
 759         for (ii=cnt=0; hostname[ii]; ii++)
 760             if (hostname[ii] == '.')
 761                 cnt++;
 762         if (cnt == 1) {
 763             /* only a two-level domain name; leave hostname */
 764         } else if (cnt == 2) {
 765             for (ii=0; user->hostname[ii] != '.'; ii++) ;
 766             /* Add 3 to account for the *. and \0. */
 767             hostname = alloca(strlen(user->hostname+ii)+3);
 768             sprintf(hostname, "*.%s", user->hostname+ii+1);
 769         } else {
 770             for (cnt=3, ii--; cnt; ii--)
 771                 if (user->hostname[ii] == '.')
 772                     cnt--;
 773             /* The loop above will overshoot the dot one character;
 774                we skip forward two (the one character and the dot)
 775                when printing, so we only add one for the \0. */
 776             hostname = alloca(strlen(user->hostname+ii)+1);
 777             sprintf(hostname, "*.%s", user->hostname+ii+2);
 778         }
 779     }
 780     // sethost - reed/apples
 781     if (IsSetHost(user))
 782       hostname = strchr(user->sethost, '@') + 1;
 783
 784     /* Emit hostmask */
 785     len = strlen(ident) + strlen(hostname) + 2;
 786     if (nickname) {
 787         len += strlen(nickname) + 1;
 788         mask = malloc(len);
 789         sprintf(mask, "%s!%s@%s", nickname, ident, hostname);
 790     } else {
 791         mask = malloc(len);
 792         sprintf(mask, "%s@%s", ident, hostname);
 793     }
 794     return mask;
 795 }
 796
 797 int
 798 IsChannelName(const char *name) {
 799     unsigned int ii;
 800
 801     if (*name !='#')
 802         return 0;
 803     for (ii=1; name[ii]; ++ii) {
 804         if ((name[ii] > 0) && (name[ii] <= 32))
 805             return 0;
 806         if (name[ii] == ',')
 807             return 0;
 808         if (name[ii] == '\xa0')
 809             return 0;
 810     }
 811     return 1;
 812 }