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 /* ELIST=[tokens]:
  75  *
  76  * M = mask search
  77  * N = !mask search
  78  * U = user count search (< >)
  79  * C = creation time search (C> C<)
  80  * T = topic search (T> T<)
  81  */
  82
  83 #include "stdinc.h"
  84 #include "client.h"
  85 #include "common.h"
  86 #include "numeric.h"
  87 #include "ircd.h"
  88 #include "s_conf.h"
  89 #include "supported.h"
  90 #include "chmode.h"
  91
  92 rb_dlink_list isupportlist;
  93
  94 struct isupportitem
  95 {
  96         const char *name;
  97         const char *(*func)(const void *);
  98         const void *param;
  99         rb_dlink_node node;
 100 };
 101
 102 void
 103 add_isupport(const char *name, const char *(*func)(const void *), const void *param)
 104 {
 105         struct isupportitem *item;
 106
 107         item = rb_malloc(sizeof(struct isupportitem));
 108         item->name = name;
 109         item->func = func;
 110         item->param = param;
 111         rb_dlinkAddTail(item, &item->node, &isupportlist);
 112 }
 113
 114 void
 115 delete_isupport(const char *name)
 116 {
 117         rb_dlink_node *ptr, *next_ptr;
 118         struct isupportitem *item;
 119
 120         RB_DLINK_FOREACH_SAFE(ptr, next_ptr, isupportlist.head)
 121         {
 122                 item = ptr->data;
 123
 124                 if (!strcmp(item->name, name))
 125                 {
 126                         rb_dlinkDelete(ptr, &isupportlist);
 127                         rb_free(item);
 128                 }
 129         }
 130 }
 131
 132 /* XXX caching? */
 133 void
 134 show_isupport(struct Client *client_p)
 135 {
 136         rb_dlink_node *ptr;
 137         struct isupportitem *item;
 138         const char *value;
 139         char buf[512];
 140         int extra_space;
 141         unsigned int nchars, nparams;
 142         int l;
 143
 144         extra_space = strlen(client_p->name);
 145         /* UID */
 146         if (!MyClient(client_p) && extra_space < 9)
 147                 extra_space = 9;
 148         /* :<me.name> 005 <nick> <params> :are supported by this server */
 149         /* form_str(RPL_ISUPPORT) is %s :are supported by this server */
 150         extra_space += strlen(me.name) + 1 + strlen(form_str(RPL_ISUPPORT));
 151
 152         nchars = extra_space, nparams = 0, buf[0] = '\0';
 153         RB_DLINK_FOREACH(ptr, isupportlist.head)
 154         {
 155                 item = ptr->data;
 156                 value = (*item->func)(item->param);
 157                 if (value == NULL)
 158                         continue;
 159                 l = strlen(item->name) + (EmptyString(value) ? 0 : 1 + strlen(value));
 160                 if (nchars + l + (nparams > 0) >= sizeof buf || nparams + 1 > 12)
 161                 {
 162                         sendto_one_numeric(client_p, RPL_ISUPPORT, form_str(RPL_ISUPPORT), buf);
 163                         nchars = extra_space, nparams = 0, buf[0] = '\0';
 164                 }
 165                 if (nparams > 0)
 166                         rb_strlcat(buf, " ", sizeof buf), nchars++;
 167                 rb_strlcat(buf, item->name, sizeof buf);
 168                 if (!EmptyString(value))
 169                 {
 170                         rb_strlcat(buf, "=", sizeof buf);
 171                         rb_strlcat(buf, value, sizeof buf);
 172                 }
 173                 nchars += l;
 174                 nparams++;
 175         }
 176         if (nparams > 0)
 177                 sendto_one_numeric(client_p, RPL_ISUPPORT, form_str(RPL_ISUPPORT), buf);
 178 }
 179
 180 const char *
 181 isupport_intptr(const void *ptr)
 182 {
 183         static char buf[15];
 184         rb_snprintf(buf, sizeof buf, "%d", *(const int *)ptr);
 185         return buf;
 186 }
 187
 188 const char *
 189 isupport_boolean(const void *ptr)
 190 {
 191
 192         return *(const int *)ptr ? "" : NULL;
 193 }
 194
 195 const char *
 196 isupport_string(const void *ptr)
 197 {
 198
 199         return (const char *)ptr;
 200 }
 201
 202 const char *
 203 isupport_stringptr(const void *ptr)
 204 {
 205         return *(char * const *)ptr;
 206 }
 207
 208 static const char *
 209 isupport_chanmodes(const void *ptr)
 210 {
 211         static char result[80];
 212
 213         rb_snprintf(result, sizeof result, "%s%sbq,k,%slj,%s",
 214                         ConfigChannel.use_except ? "e" : "",
 215                         ConfigChannel.use_invex ? "I" : "",
 216                         ConfigChannel.use_forward ? "f" : "",
 217                         cflagsbuf);
 218         return result;
 219 }
 220
 221 static const char *
 222 isupport_chanlimit(const void *ptr)
 223 {
 224         static char result[30];
 225
 226         rb_snprintf(result, sizeof result, "&#:%i", ConfigChannel.max_chans_per_user);
 227         return result;
 228 }
 229
 230 static const char *
 231 isupport_maxlist(const void *ptr)
 232 {
 233         static char result[30];
 234
 235         rb_snprintf(result, sizeof result, "bq%s%s:%i",
 236                         ConfigChannel.use_except ? "e" : "",
 237                         ConfigChannel.use_invex ? "I" : "",
 238                         ConfigChannel.max_bans);
 239         return result;
 240 }
 241
 242 static const char *
 243 isupport_targmax(const void *ptr)
 244 {
 245         static char result[200];
 246
 247         rb_snprintf(result, sizeof result, "NAMES:1,LIST:1,KICK:1,WHOIS:1,PRIVMSG:%d,NOTICE:%d,ACCEPT:,MONITOR:",
 248                         ConfigFileEntry.max_targets,
 249                         ConfigFileEntry.max_targets);
 250         return result;
 251 }
 252
 253 static const char *
 254 isupport_extban(const void *ptr)
 255 {
 256         const char *p;
 257         static char result[200];
 258
 259         p = get_extban_string();
 260         if (EmptyString(p))
 261                 return NULL;
 262         rb_snprintf(result, sizeof result, "$,%s", p);
 263         return result;
 264 }
 265
 266 void
 267 init_isupport(void)
 268 {
 269         static int maxmodes = MAXMODEPARAMS;
 270         static int nicklen = NICKLEN-1;
 271         static int channellen = LOC_CHANNELLEN;
 272         static int topiclen = TOPICLEN;
 273
 274         add_isupport("CHANTYPES", isupport_string, "&#");
 275         add_isupport("EXCEPTS", isupport_boolean, &ConfigChannel.use_except);
 276         add_isupport("INVEX", isupport_boolean, &ConfigChannel.use_invex);
 277         add_isupport("CHANMODES", isupport_chanmodes, NULL);
 278         add_isupport("CHANLIMIT", isupport_chanlimit, NULL);
 279         add_isupport("PREFIX", isupport_string, "(ov)@+");
 280         add_isupport("MAXLIST", isupport_maxlist, NULL);
 281         add_isupport("MODES", isupport_intptr, &maxmodes);
 282         add_isupport("NETWORK", isupport_stringptr, &ServerInfo.network_name);
 283         add_isupport("KNOCK", isupport_boolean, &ConfigChannel.use_knock);
 284         add_isupport("STATUSMSG", isupport_string, "@+");
 285         add_isupport("CALLERID", isupport_string, "g");
 286         add_isupport("SAFELIST", isupport_string, "");
 287         add_isupport("ELIST", isupport_string, "U");
 288         add_isupport("CASEMAPPING", isupport_string, "rfc1459");
 289         add_isupport("CHARSET", isupport_string, "ascii");
 290         add_isupport("NICKLEN", isupport_intptr, &nicklen);
 291         add_isupport("CHANNELLEN", isupport_intptr, &channellen);
 292         add_isupport("TOPICLEN", isupport_intptr, &topiclen);
 293         add_isupport("ETRACE", isupport_string, "");
 294         add_isupport("CPRIVMSG", isupport_string, "");
 295         add_isupport("CNOTICE", isupport_string, "");
 296         add_isupport("DEAF", isupport_string, "D");
 297         add_isupport("MONITOR", isupport_intptr, &ConfigFileEntry.max_monitor);
 298         add_isupport("FNC", isupport_string, "");
 299         add_isupport("TARGMAX", isupport_targmax, NULL);
 300         add_isupport("EXTBAN", isupport_extban, NULL);
 301 }