ircd/ircd_features.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/features.c
   3  * Copyright (C) 2000 Kevin L. Mitchell <klmitch@mit.edu>
   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 1, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /** @file
  20  * @brief Implementation of configurable feature support.
  21  * @version $Id: ircd_features.c,v 1.50.2.5 2006/02/16 03:49:54 entrope Exp $
  22  */
  23 #include "config.h"
  24
  25 #include "ircd_features.h"
  26 #include "channel.h"    /* list_set_default */
  27 #include "class.h"
  28 #include "client.h"
  29 #include "hash.h"
  30 #include "ircd.h"
  31 #include "ircd_alloc.h"
  32 #include "ircd_log.h"
  33 #include "ircd_reply.h"
  34 #include "ircd_string.h"
  35 #include "match.h"
  36 #include "motd.h"
  37 #include "msg.h"
  38 #include "numeric.h"
  39 #include "numnicks.h"
  40 #include "random.h"     /* random_seed_set */
  41 #include "s_bsd.h"
  42 #include "s_debug.h"
  43 #include "s_misc.h"
  44 #include "send.h"
  45 #include "struct.h"
  46 #include "sys.h"    /* FALSE bleah */
  47 #include "whowas.h"     /* whowas_realloc */
  48
  49 /* #include <assert.h> -- Now using assert in ircd_log.h */
  50 #include <stdlib.h>
  51 #include <string.h>
  52
  53 struct Client his;
  54
  55 /** List of log output types that can be set */
  56 static struct LogTypes {
  57   char *type; /**< Settable name. */
  58   int (*set)(const char *, const char *); /**< Function to set the value. */
  59   char *(*get)(const char *); /**< Function to get the value. */
  60 } logTypes[] = {
  61   { "FILE", log_set_file, log_get_file },
  62   { "FACILITY", log_set_facility, log_get_facility },
  63   { "SNOMASK", log_set_snomask, log_get_snomask },
  64   { "LEVEL", log_set_level, log_get_level },
  65   { 0, 0, 0 }
  66 };
  67
  68 /** Look up a struct LogType given the type string.
  69  * @param[in] from &Client requesting type, or NULL.
  70  * @param[in] type Name of log type to find.
  71  * @return Pointer to the found LogType, or NULL if none was found.
  72  */
  73 static struct LogTypes *
  74 feature_log_desc(struct Client* from, const char *type)
  75 {
  76   int i;
  77
  78   assert(0 != type);
  79
  80   for (i = 0; logTypes[i].type; i++) /* find appropriate descriptor */
  81     if (!ircd_strcmp(type, logTypes[i].type))
  82       return &logTypes[i];
  83
  84   Debug((DEBUG_ERROR, "Unknown log feature type \"%s\"", type));
  85   if (from) /* send an error; if from is NULL, called from conf parser */
  86     send_reply(from, ERR_BADLOGTYPE, type);
  87   else
  88     log_write(LS_CONFIG, L_ERROR, 0, "Unknown log feature type \"%s\"", type);
  89
  90   return 0; /* not found */
  91 }
  92
  93 /** Set the value of a log output type for a log subsystem.
  94  * @param[in] from &Client trying to set the log type, or NULL.
  95  * @param[in] fields Array of parameters to set.
  96  * @param[in] count Number of parameters in \a fields.
  97  * @return -1 to clear the mark, 0 to leave the mask alone, 1 to set the mask.
  98  */
  99 static int
 100 feature_log_set(struct Client* from, const char* const* fields, int count)
 101 {
 102   struct LogTypes *desc;
 103   char *subsys;
 104
 105   if (count < 2) { /* set default facility */
 106     if (log_set_default(count < 1 ? 0 : fields[0])) {
 107       assert(count >= 1); /* should always accept default */
 108
 109       if (from) /* send an error */
 110         send_reply(from, ERR_BADLOGVALUE, fields[0]);
 111       else
 112         log_write(LS_CONFIG, L_ERROR, 0,
 113                   "Bad value \"%s\" for default facility", fields[0]);
 114     } else
 115       return count < 1 ? -1 : 1; /* tell feature to set or clear mark */
 116   } else if (!(subsys = log_canon(fields[0]))) { /* no such subsystem */
 117     if (from) /* send an error */
 118       send_reply(from, ERR_BADLOGSYS, fields[0]);
 119     else
 120       log_write(LS_CONFIG, L_ERROR, 0,
 121                 "No such logging subsystem \"%s\"", fields[0]);
 122   } else if ((desc = feature_log_desc(from, fields[1]))) { /* set value */
 123     if ((*desc->set)(fields[0], count < 3 ? 0 : fields[2])) {
 124       assert(count >= 3); /* should always accept default */
 125
 126       if (from) /* send an error */
 127         send_reply(from, ERR_BADLOGVALUE, fields[2]);
 128       else
 129         log_write(LS_CONFIG, L_ERROR, 0,
 130                   "Bad value \"%s\" for log type %s (subsystem %s)",
 131                   fields[2], desc->type, subsys);
 132     }
 133   }
 134
 135   return 0;
 136 }
 137
 138 /** Reset a log type for a subsystem to its default value.
 139  * @param[in] from &Client trying to reset the subsystem.
 140  * @param[in] fields Array of parameters to reset.
 141  * @param[in] count Number of fields in \a fields.
 142  * @return -1 to unmark the entry, or zero to leave it alone.
 143  */
 144 static int
 145 feature_log_reset(struct Client* from, const char* const* fields, int count)
 146 {
 147   struct LogTypes *desc;
 148   char *subsys;
 149
 150   assert(0 != from); /* Never called by the .conf parser */
 151
 152   if (count < 1) { /* reset default facility */
 153     log_set_default(0);
 154     return -1; /* unmark this entry */
 155   } else if (count < 2)
 156     need_more_params(from, "RESET");
 157   else if (!(subsys = log_canon(fields[0]))) /* no such subsystem */
 158     send_reply(from, ERR_BADLOGSYS, fields[0]);
 159   else if ((desc = feature_log_desc(from, fields[1]))) /* reset value */
 160     (*desc->set)(fields[0], 0); /* default should always be accepted */
 161
 162   return 0;
 163 }
 164
 165 /** Handle an update to FEAT_HIS_SERVERNAME. */
 166 static void
 167 feature_notify_servername(void)
 168 {
 169   ircd_strncpy(cli_name(&his), feature_str(FEAT_HIS_SERVERNAME), HOSTLEN);
 170 }
 171
 172 /** Handle an update to FEAT_HIS_SERVERINFO. */
 173 static void
 174 feature_notify_serverinfo(void)
 175 {
 176   ircd_strncpy(cli_info(&his), feature_str(FEAT_HIS_SERVERINFO), REALLEN);
 177 }
 178
 179 /** Report the value of a log setting.
 180  * @param[in] from &Client asking for details.
 181  * @param[in] fields Array of parameters to get.
 182  * @param[in] count Number of fields in \a fields.
 183  */
 184 static void
 185 feature_log_get(struct Client* from, const char* const* fields, int count)
 186 {
 187   struct LogTypes *desc;
 188   char *value, *subsys;
 189
 190   assert(0 != from); /* never called by .conf parser */
 191
 192   if (count < 1) /* return default facility */
 193     send_reply(from, SND_EXPLICIT | RPL_FEATURE, ":Log facility: %s",
 194                log_get_default());
 195   else if (count < 2)
 196     need_more_params(from, "GET");
 197   else if (!(subsys = log_canon(fields[0]))) { /* no such subsystem */
 198     send_reply(from, ERR_BADLOGSYS, fields[0]);
 199   } else if ((desc = feature_log_desc(from, fields[1]))) {
 200     if ((value = (*desc->get)(fields[0]))) /* send along value */
 201       send_reply(from, SND_EXPLICIT | RPL_FEATURE,
 202                  ":Log %s for subsystem %s: %s", desc->type, subsys,
 203                  (*desc->get)(subsys));
 204     else
 205       send_reply(from, SND_EXPLICIT | RPL_FEATURE,
 206                  ":No log %s is set for subsystem %s", desc->type, subsys);
 207   }
 208 }
 209
 210 /** Sets a feature to the given value.
 211  * @param[in] from Client trying to set parameters.
 212  * @param[in] fields Array of parameters to set.
 213  * @param[in] count Number of fields in \a count.
 214  * @return <0 to clear the feature mark, 0 to leave it, >0 to set the feature mark.
 215  */
 216 typedef int  (*feat_set_call)(struct Client* from, const char* const* fields, int count);
 217 /** Gets the value of a feature.
 218  * @param[in] from Client trying to get parameters.
 219  * @param[in] fields Array of parameters to set.
 220  * @param[in] count Number of fields in \a count.
 221  */
 222 typedef void (*feat_get_call)(struct Client* from, const char* const* fields, int count);
 223 /** Callback to notify of a feature's change. */
 224 typedef void (*feat_notify_call)(void);
 225 /** Unmarks all sub-feature values prior to reading .conf. */
 226 typedef void (*feat_unmark_call)(void);
 227 /** Resets to defaults all currently unmarked values.
 228  * @param[in] marked Non-zero if the feature is marked.
 229  */
 230 typedef int  (*feat_mark_call)(int marked);
 231 /* Reports features as a /stats f list.
 232  * @param[in] sptr Client asking for feature list.
 233  * @param[in] marked Non-zero if the feature is marked.
 234  */
 235 typedef void (*feat_report_call)(struct Client* sptr, int marked);
 236
 237 #define FEAT_NONE   0x0000      /**< no value */
 238 #define FEAT_INT    0x0001      /**< set if entry contains an integer value */
 239 #define FEAT_BOOL   0x0002      /**< set if entry contains a boolean value */
 240 #define FEAT_STR    0x0003      /**< set if entry contains a string value */
 241 #define FEAT_MASK   0x000f      /**< possible value types */
 242
 243 #define FEAT_MARK   0x0010      /**< set if entry has been changed */
 244 #define FEAT_NULL   0x0020      /**< NULL string is permitted */
 245 #define FEAT_CASE   0x0040      /**< string is case-sensitive */
 246
 247 #define FEAT_OPER   0x0100      /**< set to display only to opers */
 248 #define FEAT_MYOPER 0x0200      /**< set to display only to local opers */
 249 #define FEAT_NODISP 0x0400      /**< feature must never be displayed */
 250
 251 #define FEAT_READ   0x1000      /**< feature is read-only (for now, perhaps?) */
 252
 253 /** Declare a feature with custom behavior. */
 254 #define F_N(type, flags, set, reset, get, notify, unmark, mark, report)       \
 255   { FEAT_ ## type, #type, FEAT_NONE | (flags), 0, 0, 0, 0,                    \
 256     (set), (reset), (get), (notify), (unmark), (mark), (report) }
 257 /** Declare a feature that takes integer values. */
 258 #define F_I(type, flags, v_int, notify)                                       \
 259   { FEAT_ ## type, #type, FEAT_INT | (flags), 0, (v_int), 0, 0,               \
 260     0, 0, 0, (notify), 0, 0, 0 }
 261 /** Declare a feature that takes boolean values. */
 262 #define F_B(type, flags, v_int, notify)                                       \
 263   { FEAT_ ## type, #type, FEAT_BOOL | (flags), 0, (v_int), 0, 0,              \
 264     0, 0, 0, (notify), 0, 0, 0 }
 265 /** Declare a feature that takes string values. */
 266 #define F_S(type, flags, v_str, notify)                                       \
 267   { FEAT_ ## type, #type, FEAT_STR | (flags), 0, 0, 0, (v_str),               \
 268     0, 0, 0, (notify), 0, 0, 0 }
 269
 270 /** Table of feature descriptions. */
 271 static struct FeatureDesc {
 272   enum Feature     feat;    /**< feature identifier */
 273   char*            type;    /**< string describing type */
 274   unsigned int     flags;   /**< flags for feature */
 275   int              v_int;   /**< integer value */
 276   int              def_int; /**< default value */
 277   char*            v_str;   /**< string value */
 278   char*            def_str; /**< default value */
 279   feat_set_call    set;     /**< set feature values */
 280   feat_set_call    reset;   /**< reset feature values to defaults */
 281   feat_get_call    get;     /**< get feature values */
 282   feat_notify_call notify;  /**< notify of value change */
 283   feat_unmark_call unmark;  /**< unmark all feature change values */
 284   feat_mark_call   mark;    /**< reset to defaults all unchanged features */
 285   feat_report_call report;  /**< report feature values */
 286 } features[] = {
 287   /* Misc. features */
 288   F_N(LOG, FEAT_MYOPER, feature_log_set, feature_log_reset, feature_log_get,
 289       0, log_feature_unmark, log_feature_mark, log_feature_report),
 290   F_S(DOMAINNAME, 0, DOMAINNAME, 0),
 291   F_B(RELIABLE_CLOCK, 0, 0, 0),
 292   F_I(BUFFERPOOL, 0, 27000000, 0),
 293   F_B(HAS_FERGUSON_FLUSHER, 0, 0, 0),
 294   F_I(CLIENT_FLOOD, 0, 1024, 0),
 295   F_I(SERVER_PORT, FEAT_OPER, 4400, 0),
 296   F_B(NODEFAULTMOTD, 0, 1, 0),
 297   F_S(MOTD_BANNER, FEAT_NULL, 0, 0),
 298   F_S(PROVIDER, FEAT_NULL, 0, 0),
 299   F_B(KILL_IPMISMATCH, FEAT_OPER, 0, 0),
 300   F_B(IDLE_FROM_MSG, 0, 1, 0),
 301   F_B(HUB, 0, 0, 0),
 302   F_B(WALLOPS_OPER_ONLY, 0, 0, 0),
 303   F_B(NODNS, 0, 0, 0),
 304   F_N(RANDOM_SEED, FEAT_NODISP, random_seed_set, 0, 0, 0, 0, 0, 0),
 305   F_S(DEFAULT_LIST_PARAM, FEAT_NULL, 0, list_set_default),
 306   F_I(NICKNAMEHISTORYLENGTH, 0, 800, whowas_realloc),
 307   F_B(HOST_HIDING, 0, 1, 0),
 308   F_S(HIDDEN_HOST, FEAT_CASE, "users.undernet.org", 0),
 309   F_S(HIDDEN_IP, 0, "127.0.0.1", 0),
 310   F_B(CONNEXIT_NOTICES, 0, 0, 0),
 311   F_B(OPLEVELS, 0, 1, 0),
 312   F_B(ZANNELS, 0, 1, 0),
 313   F_B(LOCAL_CHANNELS, 0, 1, 0),
 314   F_B(TOPIC_BURST, 0, 0, 0),
 315
 316   /* features that probably should not be touched */
 317   F_I(KILLCHASETIMELIMIT, 0, 30, 0),
 318   F_I(MAXCHANNELSPERUSER, 0, 10, 0),
 319   F_I(NICKLEN, 0, 12, 0),
 320   F_I(AVBANLEN, 0, 40, 0),
 321   F_I(MAXBANS, 0, 45, 0),
 322   F_I(MAXSILES, 0, 15, 0),
 323   F_I(HANGONGOODLINK, 0, 300, 0),
 324   F_I(HANGONRETRYDELAY, 0, 10, 0),
 325   F_I(CONNECTTIMEOUT, 0, 90, 0),
 326   F_I(MAXIMUM_LINKS, 0, 1, init_class), /* reinit class 0 as needed */
 327   F_I(PINGFREQUENCY, 0, 120, init_class),
 328   F_I(CONNECTFREQUENCY, 0, 600, init_class),
 329   F_I(DEFAULTMAXSENDQLENGTH, 0, 40000, init_class),
 330   F_I(GLINEMAXUSERCOUNT, 0, 20, 0),
 331   F_I(SOCKSENDBUF, 0, SERVER_TCP_WINDOW, 0),
 332   F_I(SOCKRECVBUF, 0, SERVER_TCP_WINDOW, 0),
 333   F_I(IPCHECK_CLONE_LIMIT, 0, 4, 0),
 334   F_I(IPCHECK_CLONE_PERIOD, 0, 40, 0),
 335   F_I(IPCHECK_CLONE_DELAY, 0, 600, 0),
 336   F_I(CHANNELLEN, 0, 200, 0),
 337
 338   /* Some misc. default paths */
 339   F_S(MPATH, FEAT_CASE | FEAT_MYOPER, "ircd.motd", motd_init),
 340   F_S(RPATH, FEAT_CASE | FEAT_MYOPER, "remote.motd", motd_init),
 341   F_S(PPATH, FEAT_CASE | FEAT_MYOPER | FEAT_READ, "ircd.pid", 0),
 342
 343   /* Networking features */
 344   F_I(TOS_SERVER, 0, 0x08, 0),
 345   F_I(TOS_CLIENT, 0, 0x08, 0),
 346   F_I(POLLS_PER_LOOP, 0, 200, 0),
 347   F_I(IRCD_RES_RETRIES, 0, 2, 0),
 348   F_I(IRCD_RES_TIMEOUT, 0, 4, 0),
 349   F_I(AUTH_TIMEOUT, 0, 9, 0),
 350   F_B(ANNOUNCE_INVITES, 0, 0, 0),
 351
 352   /* features that affect all operators */
 353   F_B(CONFIG_OPERCMDS, 0, 0, 0),
 354
 355   /* HEAD_IN_SAND Features */
 356   F_B(HIS_SNOTICES, 0, 1, 0),
 357   F_B(HIS_SNOTICES_OPER_ONLY, 0, 1, 0),
 358   F_B(HIS_DEBUG_OPER_ONLY, 0, 1, 0),
 359   F_B(HIS_WALLOPS, 0, 1, 0),
 360   F_B(HIS_MAP, 0, 1, 0),
 361   F_B(HIS_LINKS, 0, 1, 0),
 362   F_B(HIS_TRACE, 0, 1, 0),
 363   F_B(HIS_STATS_a, 0, 1, 0),
 364   F_B(HIS_STATS_c, 0, 1, 0),
 365   F_B(HIS_STATS_d, 0, 1, 0),
 366   F_B(HIS_STATS_e, 0, 1, 0),
 367   F_B(HIS_STATS_f, 0, 1, 0),
 368   F_B(HIS_STATS_g, 0, 1, 0),
 369   F_B(HIS_STATS_i, 0, 1, 0),
 370   F_B(HIS_STATS_j, 0, 1, 0),
 371   F_B(HIS_STATS_J, 0, 1, 0),
 372   F_B(HIS_STATS_k, 0, 1, 0),
 373   F_B(HIS_STATS_l, 0, 1, 0),
 374   F_B(HIS_STATS_L, 0, 1, 0),
 375   F_B(HIS_STATS_M, 0, 1, 0),
 376   F_B(HIS_STATS_m, 0, 1, 0),
 377   F_B(HIS_STATS_o, 0, 1, 0),
 378   F_B(HIS_STATS_p, 0, 1, 0),
 379   F_B(HIS_STATS_q, 0, 1, 0),
 380   F_B(HIS_STATS_R, 0, 1, 0),
 381   F_B(HIS_STATS_r, 0, 1, 0),
 382   F_B(HIS_STATS_t, 0, 1, 0),
 383   F_B(HIS_STATS_T, 0, 1, 0),
 384   F_B(HIS_STATS_u, 0, 0, 0),
 385   F_B(HIS_STATS_U, 0, 1, 0),
 386   F_B(HIS_STATS_v, 0, 1, 0),
 387   F_B(HIS_STATS_w, 0, 0, 0),
 388   F_B(HIS_STATS_x, 0, 1, 0),
 389   F_B(HIS_STATS_y, 0, 1, 0),
 390   F_B(HIS_STATS_z, 0, 1, 0),
 391   F_B(HIS_STATS_IAUTH, 0, 1, 0),
 392   F_B(HIS_WHOIS_SERVERNAME, 0, 1, 0),
 393   F_B(HIS_WHOIS_IDLETIME, 0, 1, 0),
 394   F_B(HIS_WHOIS_LOCALCHAN, 0, 1, 0),
 395   F_B(HIS_WHO_SERVERNAME, 0, 1, 0),
 396   F_B(HIS_WHO_HOPCOUNT, 0, 1, 0),
 397   F_B(HIS_MODEWHO, 0, 1, 0),
 398   F_B(HIS_BANWHO, 0, 1, 0),
 399   F_B(HIS_KILLWHO, 0, 1, 0),
 400   F_B(HIS_REWRITE, 0, 1, 0),
 401   F_I(HIS_REMOTE, 0, 1, 0),
 402   F_B(HIS_NETSPLIT, 0, 1, 0),
 403   F_S(HIS_SERVERNAME, 0, "*.undernet.org", feature_notify_servername),
 404   F_S(HIS_SERVERINFO, 0, "The Undernet Underworld", feature_notify_serverinfo),
 405   F_S(HIS_URLSERVERS, 0, "http://www.undernet.org/servers.php", 0),
 406
 407   /* Misc. random stuff */
 408   F_S(NETWORK, 0, "UnderNet", 0),
 409   F_S(URL_CLIENTS, 0, "ftp://ftp.undernet.org/pub/irc/clients", 0),
 410
 411 #undef F_S
 412 #undef F_B
 413 #undef F_I
 414 #undef F_N
 415   { FEAT_LAST_F, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
 416 };
 417
 418 /** Given a feature's identifier, look up the feature descriptor.
 419  * @param[in] from Client looking up feature, or NULL.
 420  * @param[in] feature Feature name to find.
 421  * @return Pointer to a FeatureDesc, or NULL if none was found.
 422  */
 423 static struct FeatureDesc *
 424 feature_desc(struct Client* from, const char *feature)
 425 {
 426   int i;
 427
 428   assert(0 != feature);
 429
 430   for (i = 0; features[i].type; i++) /* find appropriate descriptor */
 431     if (!strcmp(feature, features[i].type))
 432       return &features[i];
 433
 434   Debug((DEBUG_ERROR, "Unknown feature \"%s\"", feature));
 435   if (from) /* report an error */
 436     send_reply(from, ERR_NOFEATURE, feature);
 437   else
 438     log_write(LS_CONFIG, L_ERROR, 0, "Unknown feature \"%s\"", feature);
 439
 440   return 0; /* not found */
 441 }
 442
 443 /** Given a feature vector string, set the value of a feature.
 444  * @param[in] from Client trying to set the feature, or NULL.
 445  * @param[in] fields Parameters to set, starting with feature name.
 446  * @param[in] count Number of fields in \a fields.
 447  * @return Zero (or, theoretically, CPTR_KILLED).
 448  */
 449 int
 450 feature_set(struct Client* from, const char* const* fields, int count)
 451 {
 452   int i, change = 0, tmp;
 453   const char *t_str;
 454   struct FeatureDesc *feat;
 455
 456   if (from && !HasPriv(from, PRIV_SET))
 457     return send_reply(from, ERR_NOPRIVILEGES);
 458
 459   if (count < 1) {
 460     if (from) /* report an error in the number of arguments */
 461       need_more_params(from, "SET");
 462     else
 463       log_write(LS_CONFIG, L_ERROR, 0, "Not enough fields in F line");
 464   } else if ((feat = feature_desc(from, fields[0]))) { /* find feature */
 465     if (from && feat->flags & FEAT_READ)
 466       return send_reply(from, ERR_NOFEATURE, fields[0]);
 467
 468     switch (feat->flags & FEAT_MASK) {
 469     case FEAT_NONE:
 470       if (feat->set && (i = (*feat->set)(from, fields + 1, count - 1))) {
 471         change++; /* feature handler wants a change recorded */
 472
 473         if (i > 0) /* call the set callback and do marking */
 474           feat->flags |= FEAT_MARK;
 475         else /* i < 0 */
 476           feat->flags &= ~FEAT_MARK;
 477         break;
 478       }
 479
 480     case FEAT_INT: /* an integer value */
 481       tmp = feat->v_int; /* detect changes... */
 482
 483       if (count < 2) { /* reset value */
 484         feat->v_int = feat->def_int;
 485         feat->flags &= ~FEAT_MARK;
 486       } else { /* ok, figure out the value and whether to mark it */
 487         feat->v_int = strtoul(fields[1], 0, 0);
 488         if (feat->v_int == feat->def_int)
 489           feat->flags &= ~FEAT_MARK;
 490         else
 491           feat->flags |= FEAT_MARK;
 492       }
 493
 494       if (feat->v_int != tmp) /* check for change */
 495         change++;
 496       break;
 497
 498     case FEAT_BOOL: /* it's a boolean value--true or false */
 499       tmp = feat->v_int; /* detect changes... */
 500
 501       if (count < 2) { /* reset value */
 502         feat->v_int = feat->def_int;
 503         feat->flags &= ~FEAT_MARK;
 504       } else { /* figure out the value and whether to mark it */
 505         if (!ircd_strncmp(fields[1], "TRUE", strlen(fields[1])) ||
 506             !ircd_strncmp(fields[1], "YES", strlen(fields[1])) ||
 507             (strlen(fields[1]) >= 2 &&
 508              !ircd_strncmp(fields[1], "ON", strlen(fields[1]))))
 509           feat->v_int = 1;
 510         else if (!ircd_strncmp(fields[1], "FALSE", strlen(fields[1])) ||
 511                  !ircd_strncmp(fields[1], "NO", strlen(fields[1])) ||
 512                  (strlen(fields[1]) >= 2 &&
 513                   !ircd_strncmp(fields[1], "OFF", strlen(fields[1]))))
 514           feat->v_int = 0;
 515         else if (from) /* report an error... */
 516           return send_reply(from, ERR_BADFEATVALUE, fields[1], feat->type);
 517         else {
 518           log_write(LS_CONFIG, L_ERROR, 0, "Bad value \"%s\" for feature %s",
 519                     fields[1], feat->type);
 520           return 0;
 521         }
 522
 523         if (feat->v_int == feat->def_int) /* figure out whether to mark it */
 524           feat->flags &= ~FEAT_MARK;
 525         else
 526           feat->flags |= FEAT_MARK;
 527       }
 528
 529       if (feat->v_int != tmp) /* check for change */
 530         change++;
 531       break;
 532
 533     case FEAT_STR: /* it's a string value */
 534       if (count < 2)
 535         t_str = feat->def_str; /* changing to default */
 536       else
 537         t_str = *fields[1] ? fields[1] : 0;
 538
 539       if (!t_str && !(feat->flags & FEAT_NULL)) { /* NULL value permitted? */
 540         if (from)
 541           return send_reply(from, ERR_BADFEATVALUE, "NULL", feat->type);
 542         else {
 543           log_write(LS_CONFIG, L_ERROR, 0, "Bad value \"NULL\" for feature %s",
 544                     feat->type);
 545           return 0;
 546         }
 547       }
 548
 549       if (t_str == feat->def_str ||
 550           (t_str && feat->def_str &&
 551            !(feat->flags & FEAT_CASE ? strcmp(t_str, feat->def_str) :
 552              ircd_strcmp(t_str, feat->def_str)))) { /* resetting to default */
 553         if (feat->v_str != feat->def_str) {
 554           change++; /* change from previous value */
 555
 556           if (feat->v_str)
 557             MyFree(feat->v_str); /* free old value */
 558         }
 559
 560         feat->v_str = feat->def_str; /* very special... */
 561
 562         feat->flags &= ~FEAT_MARK;
 563       } else if (!t_str) {
 564         if (feat->v_str) {
 565           change++; /* change from previous value */
 566
 567           if (feat->v_str != feat->def_str)
 568             MyFree(feat->v_str); /* free old value */
 569         }
 570
 571         feat->v_str = 0; /* set it to NULL */
 572
 573         feat->flags |= FEAT_MARK;
 574       } else if (!feat->v_str ||
 575                  (feat->flags & FEAT_CASE ? strcmp(t_str, feat->v_str) :
 576                   ircd_strcmp(t_str, feat->v_str))) { /* new value */
 577         change++; /* change from previous value */
 578
 579         if (feat->v_str && feat->v_str != feat->def_str)
 580           MyFree(feat->v_str); /* free old value */
 581         DupString(feat->v_str, t_str); /* store new value */
 582
 583         feat->flags |= FEAT_MARK;
 584       } else /* they match, but don't match the default */
 585         feat->flags |= FEAT_MARK;
 586       break;
 587     }
 588
 589     if (change && feat->notify) /* call change notify function */
 590       (*feat->notify)();
 591   }
 592
 593   return 0;
 594 }
 595
 596 /** Reset a feature to its default values.
 597  * @param[in] from Client trying to reset the feature, or NULL.
 598  * @param[in] fields Parameters to set, starting with feature name.
 599  * @param[in] count Number of fields in \a fields.
 600  * @return Zero (or, theoretically, CPTR_KILLED).
 601  */
 602 int
 603 feature_reset(struct Client* from, const char* const* fields, int count)
 604 {
 605   int i, change = 0;
 606   struct FeatureDesc *feat;
 607
 608   assert(0 != from);
 609
 610   if (!HasPriv(from, PRIV_SET))
 611     return send_reply(from, ERR_NOPRIVILEGES);
 612
 613   if (count < 1) /* check arguments */
 614     need_more_params(from, "RESET");
 615   else if ((feat = feature_desc(from, fields[0]))) { /* get descriptor */
 616     if (from && feat->flags & FEAT_READ)
 617       return send_reply(from, ERR_NOFEATURE, fields[0]);
 618
 619     switch (feat->flags & FEAT_MASK) {
 620     case FEAT_NONE: /* None... */
 621       if (feat->reset && (i = (*feat->reset)(from, fields + 1, count - 1))) {
 622         change++; /* feature handler wants a change recorded */
 623
 624         if (i > 0) /* call reset callback and parse mark return */
 625           feat->flags |= FEAT_MARK;
 626         else /* i < 0 */
 627           feat->flags &= ~FEAT_MARK;
 628       }
 629       break;
 630
 631     case FEAT_INT:  /* Integer... */
 632     case FEAT_BOOL: /* Boolean... */
 633       if (feat->v_int != feat->def_int)
 634         change++; /* change will be made */
 635
 636       feat->v_int = feat->def_int; /* set the default */
 637       feat->flags &= ~FEAT_MARK; /* unmark it */
 638       break;
 639
 640     case FEAT_STR: /* string! */
 641       if (feat->v_str != feat->def_str) {
 642         change++; /* change has been made */
 643         if (feat->v_str)
 644           MyFree(feat->v_str); /* free old value */
 645       }
 646
 647       feat->v_str = feat->def_str; /* set it to default */
 648       feat->flags &= ~FEAT_MARK; /* unmark it */
 649       break;
 650     }
 651
 652     if (change && feat->notify) /* call change notify function */
 653       (*feat->notify)();
 654   }
 655
 656   return 0;
 657 }
 658
 659 /** Gets the value of a specific feature and reports it to the user.
 660  * @param[in] from Client trying to get the feature.
 661  * @param[in] fields Parameters to set, starting with feature name.
 662  * @param[in] count Number of fields in \a fields.
 663  * @return Zero (or, theoretically, CPTR_KILLED).
 664  */
 665 int
 666 feature_get(struct Client* from, const char* const* fields, int count)
 667 {
 668   struct FeatureDesc *feat;
 669
 670   assert(0 != from);
 671
 672   if (count < 1) /* check parameters */
 673     need_more_params(from, "GET");
 674   else if ((feat = feature_desc(from, fields[0]))) {
 675     if ((feat->flags & FEAT_NODISP) ||
 676         (feat->flags & FEAT_MYOPER && !MyOper(from)) ||
 677         (feat->flags & FEAT_OPER && !IsAnOper(from))) /* check privs */
 678       return send_reply(from, ERR_NOPRIVILEGES);
 679
 680     switch (feat->flags & FEAT_MASK) {
 681     case FEAT_NONE: /* none, call the callback... */
 682       if (feat->get) /* if there's a callback, use it */
 683         (*feat->get)(from, fields + 1, count - 1);
 684       break;
 685
 686     case FEAT_INT: /* integer, report integer value */
 687       send_reply(from, SND_EXPLICIT | RPL_FEATURE,
 688                  ":Integer value of %s: %d", feat->type, feat->v_int);
 689       break;
 690
 691     case FEAT_BOOL: /* boolean, report boolean value */
 692       send_reply(from, SND_EXPLICIT | RPL_FEATURE,
 693                  ":Boolean value of %s: %s", feat->type,
 694                  feat->v_int ? "TRUE" : "FALSE");
 695       break;
 696
 697     case FEAT_STR: /* string, report string value */
 698       if (feat->v_str) /* deal with null case */
 699         send_reply(from, SND_EXPLICIT | RPL_FEATURE,
 700                    ":String value of %s: %s", feat->type, feat->v_str);
 701       else
 702         send_reply(from, SND_EXPLICIT | RPL_FEATURE,
 703                    ":String value for %s not set", feat->type);
 704       break;
 705     }
 706   }
 707
 708   return 0;
 709 }
 710
 711 /** Called before reading the .conf to clear all dirty marks. */
 712 void
 713 feature_unmark(void)
 714 {
 715   int i;
 716
 717   for (i = 0; features[i].type; i++) {
 718     features[i].flags &= ~FEAT_MARK; /* clear the marks... */
 719     if (features[i].unmark) /* call the unmark callback if necessary */
 720       (*features[i].unmark)();
 721   }
 722 }
 723
 724 /** Called after reading the .conf to reset unmodified values to defaults. */
 725 void
 726 feature_mark(void)
 727 {
 728   int i, change;
 729
 730   for (i = 0; features[i].type; i++) {
 731     change = 0;
 732
 733     switch (features[i].flags & FEAT_MASK) {
 734     case FEAT_NONE:
 735       if (features[i].mark &&
 736           (*features[i].mark)(features[i].flags & FEAT_MARK ? 1 : 0))
 737         change++; /* feature handler wants a change recorded */
 738       break;
 739
 740     case FEAT_INT:  /* Integers or Booleans... */
 741     case FEAT_BOOL:
 742       if (!(features[i].flags & FEAT_MARK)) { /* not changed? */
 743         if (features[i].v_int != features[i].def_int)
 744           change++; /* we're making a change */
 745         features[i].v_int = features[i].def_int;
 746       }
 747       break;
 748
 749     case FEAT_STR: /* strings... */
 750       if (!(features[i].flags & FEAT_MARK)) { /* not changed? */
 751         if (features[i].v_str != features[i].def_str) {
 752           change++; /* we're making a change */
 753           if (features[i].v_str)
 754             MyFree(features[i].v_str); /* free old value */
 755         }
 756         features[i].v_str = features[i].def_str;
 757       }
 758       break;
 759     }
 760
 761     if (change && features[i].notify)
 762       (*features[i].notify)(); /* call change notify function */
 763   }
 764 }
 765
 766 /** Initialize the features subsystem. */
 767 void
 768 feature_init(void)
 769 {
 770   int i;
 771
 772   for (i = 0; features[i].type; i++) {
 773     switch (features[i].flags & FEAT_MASK) {
 774     case FEAT_NONE: /* you're on your own */
 775       break;
 776
 777     case FEAT_INT:  /* Integers or Booleans... */
 778     case FEAT_BOOL:
 779       features[i].v_int = features[i].def_int;
 780       break;
 781
 782     case FEAT_STR:  /* Strings */
 783       features[i].v_str = features[i].def_str;
 784       assert(features[i].def_str || (features[i].flags & FEAT_NULL));
 785       break;
 786     }
 787   }
 788
 789   cli_magic(&his) = CLIENT_MAGIC;
 790   cli_status(&his) = STAT_SERVER;
 791   feature_notify_servername();
 792   feature_notify_serverinfo();
 793 }
 794
 795 /** Report all F-lines to a user.
 796  * @param[in] to Client requesting statistics.
 797  * @param[in] sd Stats descriptor for request (ignored).
 798  * @param[in] param Extra parameter from user (ignored).
 799  */
 800 void
 801 feature_report(struct Client* to, const struct StatDesc* sd, char* param)
 802 {
 803   int i;
 804
 805   for (i = 0; features[i].type; i++) {
 806     if ((features[i].flags & FEAT_NODISP) ||
 807         (features[i].flags & FEAT_MYOPER && !MyOper(to)) ||
 808         (features[i].flags & FEAT_OPER && !IsAnOper(to)))
 809       continue; /* skip this one */
 810
 811     switch (features[i].flags & FEAT_MASK) {
 812     case FEAT_NONE:
 813       if (features[i].report) /* let the callback handle this */
 814         (*features[i].report)(to, features[i].flags & FEAT_MARK ? 1 : 0);
 815       break;
 816
 817
 818     case FEAT_INT: /* Report an F-line with integer values */
 819       if (features[i].flags & FEAT_MARK) /* it's been changed */
 820         send_reply(to, SND_EXPLICIT | RPL_STATSFLINE, "F %s %d",
 821                    features[i].type, features[i].v_int);
 822       break;
 823
 824     case FEAT_BOOL: /* Report an F-line with boolean values */
 825       if (features[i].flags & FEAT_MARK) /* it's been changed */
 826         send_reply(to, SND_EXPLICIT | RPL_STATSFLINE, "F %s %s",
 827                    features[i].type, features[i].v_int ? "TRUE" : "FALSE");
 828       break;
 829
 830     case FEAT_STR: /* Report an F-line with string values */
 831       if (features[i].flags & FEAT_MARK) { /* it's been changed */
 832         if (features[i].v_str)
 833           send_reply(to, SND_EXPLICIT | RPL_STATSFLINE, "F %s %s",
 834                      features[i].type, features[i].v_str);
 835         else /* Actually, F:<type> would reset it; you want F:<type>: */
 836           send_reply(to, SND_EXPLICIT | RPL_STATSFLINE, "F %s",
 837                      features[i].type);
 838       }
 839       break;
 840     }
 841   }
 842 }
 843
 844 /** Return a feature's integer value.
 845  * @param[in] feat &Feature identifier.
 846  * @return Integer value of feature.
 847  */
 848 int
 849 feature_int(enum Feature feat)
 850 {
 851   assert(features[feat].feat == feat);
 852   assert((features[feat].flags & FEAT_MASK) == FEAT_INT);
 853
 854   return features[feat].v_int;
 855 }
 856
 857 /** Return a feature's boolean value.
 858  * @param[in] feat &Feature identifier.
 859  * @return Boolean value of feature.
 860  */
 861 int
 862 feature_bool(enum Feature feat)
 863 {
 864   assert(feat <= FEAT_LAST_F);
 865   if (FEAT_LAST_F < feat)
 866     return 0;
 867   assert(features[feat].feat == feat);
 868   assert((features[feat].flags & FEAT_MASK) == FEAT_BOOL);
 869
 870   return features[feat].v_int;
 871 }
 872
 873 /** Return a feature's string value.
 874  * @param[in] feat &Feature identifier.
 875  * @return String value of feature.
 876  */
 877 const char *
 878 feature_str(enum Feature feat)
 879 {
 880   assert(features[feat].feat == feat);
 881   assert((features[feat].flags & FEAT_MASK) == FEAT_STR);
 882
 883   return features[feat].v_str;
 884 }