src/supported.c

   1 /*
   2  *  charybdis: A slightly useful ircd.
   3  *  supported.c: isupport (005) numeric
   4  *
   5  * Copyright (C) 2006 Jilles Tjoelker
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are
   9  * met:
  10  *
  11  * 1.Redistributions of source code must retain the above copyright notice,
  12  *   this list of conditions and the following disclaimer.
  13  * 2.Redistributions in binary form must reproduce the above copyright
  14  *   notice, this list of conditions and the following disclaimer in the
  15  *   documentation and/or other materials provided with the distribution.
  16  * 3.The name of the author may not be used to endorse or promote products
  17  *   derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  23  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  25  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  27  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  28  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  *  $Id: supported.c 3568 2007-09-09 18:59:08Z jilles $
  32  */
  33
  34 /* From the old supported.h which is
  35  *  Copyright (C) 1996-2002 Hybrid Development Team
  36  *  Copyright (C) 2002-2004 ircd-ratbox development team
  37  */
  38 /*
  39  * - from mirc's versions.txt
  40  *
  41  *  mIRC now supports the numeric 005 tokens: CHANTYPES=# and
  42  *  PREFIX=(ohv)@%+ and can handle a dynamic set of channel and
  43  *  nick prefixes.
  44  *
  45  *  mIRC assumes that @ is supported on all networks, any mode
  46  *  left of @ is assumed to have at least equal power to @, and
  47  *  any mode right of @ has less power.
  48  *
  49  *  mIRC has internal support for @%+ modes.
  50  *
  51  *  $nick() can now handle all mode letters listed in PREFIX.
  52  *
  53  *  Also added support for CHANMODES=A,B,C,D token (not currently
  54  *  supported by any servers), which lists all modes supported
  55  *  by a channel, where:
  56  *
  57  *    A = modes that take a parameter, and add or remove nicks
  58  *        or addresses to a list, such as +bIe for the ban,
  59  *        invite, and exception lists.
  60  *
  61  *    B = modes that change channel settings, but which take
  62  *        a parameter when they are set and unset, such as
  63  *        +k key, and -k key.
  64  *
  65  *    C = modes that change channel settings, but which take
  66  *        a parameter only when they are set, such as +l N,
  67  *        and -l.
  68  *
  69  *    D = modes that change channel settings, such as +imnpst
  70  *        and take no parameters.
  71  *
  72  *  All unknown/unlisted modes are treated as type D.
  73  */
  74
  75 #include "stdinc.h"
  76 #include "client.h"
  77 #include "common.h"
  78 #include "numeric.h"
  79 #include "ircd.h"
  80 #include "s_conf.h"
  81 #include "s_user.h"
  82 #include "supported.h"
  83 #include "chmode.h"
  84 #include "send.h"
  85
  86 rb_dlink_list isupportlist;
  87
  88 struct isupportitem
  89 {
  90         const char *name;
  91         const char *(*func)(const void *);
  92         const void *param;
  93         rb_dlink_node node;
  94 };
  95
  96 void
  97 add_isupport(const char *name, const char *(*func)(const void *), const void *param)
  98 {
  99         struct isupportitem *item;
 100
 101         item = rb_malloc(sizeof(struct isupportitem));
 102         item->name = name;
 103         item->func = func;
 104         item->param = param;
 105         rb_dlinkAddTail(item, &item->node, &isupportlist);
 106 }
 107
 108 const void *
 109 change_isupport(const char *name, const char *(*func)(const void *), const void *param)
 110 {
 111         rb_dlink_node *ptr;
 112         struct isupportitem *item;
 113         const void *oldvalue = NULL;
 114
 115         RB_DLINK_FOREACH(ptr, isupportlist.head)
 116         {
 117                 item = ptr->data;
 118
 119                 if (!strcmp(item->name, name))
 120                 {
 121                         oldvalue = item->param;
 122
 123                         // item->name = name;
 124                         item->func = func;
 125                         item->param = param;
 126
 127                         break;
 128                 }
 129         }
 130
 131         return oldvalue;
 132 }
 133
 134 void
 135 delete_isupport(const char *name)
 136 {
 137         rb_dlink_node *ptr, *next_ptr;
 138         struct isupportitem *item;
 139
 140         RB_DLINK_FOREACH_SAFE(ptr, next_ptr, isupportlist.head)
 141         {
 142                 item = ptr->data;
 143
 144                 if (!strcmp(item->name, name))
 145                 {
 146                         rb_dlinkDelete(ptr, &isupportlist);
 147                         rb_free(item);
 148                 }
 149         }
 150 }
 151
 152 /* XXX caching? */
 153 void
 154 show_isupport(struct Client *client_p)
 155 {
 156         rb_dlink_node *ptr;
 157         struct isupportitem *item;
 158         const char *value;
 159         char buf[512];
 160         int extra_space;
 161         unsigned int nchars, nparams;
 162         int l;
 163
 164         extra_space = strlen(client_p->name);
 165         /* UID */
 166         if (!MyClient(client_p) && extra_space < 9)
 167                 extra_space = 9;
 168         /* :<me.name> 005 <nick> <params> :are supported by this server */
 169         /* form_str(RPL_ISUPPORT) is %s :are supported by this server */
 170         extra_space += strlen(me.name) + 1 + strlen(form_str(RPL_ISUPPORT));
 171
 172         nchars = extra_space, nparams = 0, buf[0] = '\0';
 173         RB_DLINK_FOREACH(ptr, isupportlist.head)
 174         {
 175                 item = ptr->data;
 176                 value = (*item->func)(item->param);
 177                 if (value == NULL)
 178                         continue;
 179                 l = strlen(item->name) + (EmptyString(value) ? 0 : 1 + strlen(value));
 180                 if (nchars + l + (nparams > 0) >= sizeof buf || nparams + 1 > 12)
 181                 {
 182                         sendto_one_numeric(client_p, RPL_ISUPPORT, form_str(RPL_ISUPPORT), buf);
 183                         nchars = extra_space, nparams = 0, buf[0] = '\0';
 184                 }
 185                 if (nparams > 0)
 186                         rb_strlcat(buf, " ", sizeof buf), nchars++;
 187                 rb_strlcat(buf, item->name, sizeof buf);
 188                 if (!EmptyString(value))
 189                 {
 190                         rb_strlcat(buf, "=", sizeof buf);
 191                         rb_strlcat(buf, value, sizeof buf);
 192                 }
 193                 nchars += l;
 194                 nparams++;
 195         }
 196         if (nparams > 0)
 197                 sendto_one_numeric(client_p, RPL_ISUPPORT, form_str(RPL_ISUPPORT), buf);
 198 }
 199
 200 const char *
 201 isupport_intptr(const void *ptr)
 202 {
 203         static char buf[15];
 204         rb_snprintf(buf, sizeof buf, "%d", *(const int *)ptr);
 205         return buf;
 206 }
 207
 208 const char *
 209 isupport_boolean(const void *ptr)
 210 {
 211
 212         return *(const int *)ptr ? "" : NULL;
 213 }
 214
 215 const char *
 216 isupport_string(const void *ptr)
 217 {
 218
 219         return (const char *)ptr;
 220 }
 221
 222 const char *
 223 isupport_stringptr(const void *ptr)
 224 {
 225         return *(char * const *)ptr;
 226 }
 227
 228 static const char *
 229 isupport_umode(const void *ptr)
 230 {
 231         const char *str;
 232
 233         str = ptr;
 234         return ConfigFileEntry.oper_only_umodes &
 235                 user_modes[(unsigned char)*str] ? NULL : str;
 236 }
 237
 238 static const char *
 239 isupport_chanmodes(const void *ptr)
 240 {
 241         static char result[80];
 242
 243         rb_snprintf(result, sizeof result, "%s%sbq,k,%slj,%s",
 244                         ConfigChannel.use_except ? "e" : "",
 245                         ConfigChannel.use_invex ? "I" : "",
 246                         ConfigChannel.use_forward ? "f" : "",
 247                         cflagsbuf);
 248         return result;
 249 }
 250
 251 static const char *
 252 isupport_chantypes(const void *ptr)
 253 {
 254         return ConfigChannel.disable_local_channels ? "#" : "&#";
 255 }
 256
 257 static const char *
 258 isupport_chanlimit(const void *ptr)
 259 {
 260         static char result[30];
 261
 262         rb_snprintf(result, sizeof result, "%s:%i",
 263                 ConfigChannel.disable_local_channels ? "#" : "&#", ConfigChannel.max_chans_per_user);
 264         return result;
 265 }
 266
 267 static const char *
 268 isupport_maxlist(const void *ptr)
 269 {
 270         static char result[30];
 271
 272         rb_snprintf(result, sizeof result, "bq%s%s:%i",
 273                         ConfigChannel.use_except ? "e" : "",
 274                         ConfigChannel.use_invex ? "I" : "",
 275                         ConfigChannel.max_bans);
 276         return result;
 277 }
 278
 279 static const char *
 280 isupport_targmax(const void *ptr)
 281 {
 282         static char result[200];
 283
 284         rb_snprintf(result, sizeof result, "NAMES:1,LIST:1,KICK:1,WHOIS:1,PRIVMSG:%d,NOTICE:%d,ACCEPT:,MONITOR:",
 285                         ConfigFileEntry.max_targets,
 286                         ConfigFileEntry.max_targets);
 287         return result;
 288 }
 289
 290 static const char *
 291 isupport_extban(const void *ptr)
 292 {
 293         const char *p;
 294         static char result[200];
 295
 296         p = get_extban_string();
 297         if (EmptyString(p))
 298                 return NULL;
 299         rb_snprintf(result, sizeof result, "$,%s", p);
 300         return result;
 301 }
 302
 303 static const char *
 304 isupport_nicklen(const void *ptr)
 305 {
 306         static char result[200];
 307
 308         rb_snprintf(result, sizeof result, "%u", ConfigFileEntry.nicklen - 1);
 309         return result;
 310 }
 311
 312 void
 313 init_isupport(void)
 314 {
 315         static int maxmodes = MAXMODEPARAMS;
 316         static int channellen = LOC_CHANNELLEN;
 317         static int topiclen = TOPICLEN;
 318         static int maxnicklen = NICKLEN - 1;
 319
 320         add_isupport("CHANTYPES", isupport_chantypes, NULL);
 321         add_isupport("EXCEPTS", isupport_boolean, &ConfigChannel.use_except);
 322         add_isupport("INVEX", isupport_boolean, &ConfigChannel.use_invex);
 323         add_isupport("CHANMODES", isupport_chanmodes, NULL);
 324         add_isupport("CHANLIMIT", isupport_chanlimit, NULL);
 325         add_isupport("PREFIX", isupport_string, "(ov)@+");
 326         add_isupport("MAXLIST", isupport_maxlist, NULL);
 327         add_isupport("MODES", isupport_intptr, &maxmodes);
 328         add_isupport("NETWORK", isupport_stringptr, &ServerInfo.network_name);
 329         add_isupport("KNOCK", isupport_boolean, &ConfigChannel.use_knock);
 330         add_isupport("STATUSMSG", isupport_string, "@+");
 331         add_isupport("CALLERID", isupport_umode, "g");
 332         add_isupport("CASEMAPPING", isupport_string, "rfc1459");
 333         add_isupport("CHARSET", isupport_string, "ascii");
 334         add_isupport("NICKLEN", isupport_nicklen, NULL);
 335         add_isupport("MAXNICKLEN", isupport_intptr, &maxnicklen);
 336         add_isupport("CHANNELLEN", isupport_intptr, &channellen);
 337         add_isupport("TOPICLEN", isupport_intptr, &topiclen);
 338         add_isupport("ETRACE", isupport_string, "");
 339         add_isupport("CPRIVMSG", isupport_string, "");
 340         add_isupport("CNOTICE", isupport_string, "");
 341         add_isupport("DEAF", isupport_umode, "D");
 342         add_isupport("MONITOR", isupport_intptr, &ConfigFileEntry.max_monitor);
 343         add_isupport("FNC", isupport_string, "");
 344         add_isupport("TARGMAX", isupport_targmax, NULL);
 345         add_isupport("EXTBAN", isupport_extban, NULL);
 346         add_isupport("WHOX", isupport_string, "");
 347         add_isupport("CLIENTVER", isupport_string, "3.0");
 348 }