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 155 2006-11-18 15:22:35Z beu $
  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 "tools.h"
  85 #include "client.h"
  86 #include "common.h"
  87 #include "numeric.h"
  88 #include "ircd.h"
  89 #include "s_conf.h"
  90
  91 dlink_list isupportlist;
  92
  93 struct isupportitem
  94 {
  95         const char *name;
  96         const char *(*func)(void *);
  97         void *param;
  98         dlink_node node;
  99 };
 100
 101 void
 102 add_isupport(const char *name, const char *(*func)(void *), void *param)
 103 {
 104         struct isupportitem *item;
 105
 106         item = MyMalloc(sizeof(struct isupportitem));
 107         item->name = name;
 108         item->func = func;
 109         item->param = param;
 110         dlinkAddTail(item, &item->node, &isupportlist);
 111 }
 112
 113 void
 114 delete_isupport(const char *name)
 115 {
 116         dlink_node *ptr, *next_ptr;
 117         struct isupportitem *item;
 118
 119         DLINK_FOREACH_SAFE(ptr, next_ptr, isupportlist.head)
 120         {
 121                 item = ptr->data;
 122
 123                 if (!strcmp(item->name, name))
 124                 {
 125                         dlinkDelete(ptr, &isupportlist);
 126                         MyFree(item);
 127                 }
 128         }
 129 }
 130
 131 /* XXX caching? */
 132 void
 133 show_isupport(struct Client *client_p)
 134 {
 135         dlink_node *ptr;
 136         struct isupportitem *item;
 137         const char *value;
 138         char buf[512];
 139         int extra_space;
 140         int nchars, nparams;
 141         int l;
 142
 143         extra_space = strlen(client_p->name);
 144         /* UID */
 145         if (!MyClient(client_p) && extra_space < 9)
 146                 extra_space = 9;
 147         /* :<me.name> 005 <nick> <params> :are supported by this server */
 148         /* form_str(RPL_ISUPPORT) is %s :are supported by this server */
 149         extra_space += strlen(me.name) + 1 + strlen(form_str(RPL_ISUPPORT));
 150
 151         nchars = extra_space, nparams = 0, buf[0] = '\0';
 152         DLINK_FOREACH(ptr, isupportlist.head)
 153         {
 154                 item = ptr->data;
 155                 value = (*item->func)(item->param);
 156                 if (value == NULL)
 157                         continue;
 158                 l = strlen(item->name) + (EmptyString(value) ? 0 : 1 + strlen(value));
 159                 if (nchars + l + (nparams > 0) >= sizeof buf || nparams + 1 > 12)
 160                 {
 161                         sendto_one_numeric(client_p, RPL_ISUPPORT, form_str(RPL_ISUPPORT), buf);
 162                         nchars = extra_space, nparams = 0, buf[0] = '\0';
 163                 }
 164                 if (nparams > 0)
 165                         strlcat(buf, " ", sizeof buf), nchars++;
 166                 strlcat(buf, item->name, sizeof buf);
 167                 if (!EmptyString(value))
 168                 {
 169                         strlcat(buf, "=", sizeof buf);
 170                         strlcat(buf, value, sizeof buf);
 171                 }
 172                 nchars += l;
 173                 nparams++;
 174         }
 175         if (nparams > 0)
 176                 sendto_one_numeric(client_p, RPL_ISUPPORT, form_str(RPL_ISUPPORT), buf);
 177 }
 178
 179 const char *
 180 isupport_intptr(void *ptr)
 181 {
 182         static char buf[15];
 183
 184         ircsnprintf(buf, sizeof buf, "%d", *(int *)ptr);
 185         return buf;
 186 }
 187
 188 const char *
 189 isupport_boolean(void *ptr)
 190 {
 191
 192         return *(int *)ptr ? "" : NULL;
 193 }
 194
 195 const char *
 196 isupport_string(void *ptr)
 197 {
 198
 199         return (const char *)ptr;
 200 }
 201
 202 const char *
 203 isupport_stringptr(void *ptr)
 204 {
 205
 206         return *(const char **)ptr;
 207 }
 208
 209 const char *
 210 isupport_chanmodes(void *ptr)
 211 {
 212         static char result[80];
 213
 214         ircsnprintf(result, sizeof result, "%s%sbq,k,flLj,imnpstrcgzPQFR",
 215                         ConfigChannel.use_except ? "e" : "",
 216                         ConfigChannel.use_invex ? "I" : "");
 217         return result;
 218 }
 219
 220 const char *
 221 isupport_chanlimit(void *ptr)
 222 {
 223         static char result[30];
 224
 225         ircsnprintf(result, sizeof result, "&#:%i", ConfigChannel.max_chans_per_user);
 226         return result;
 227 }
 228
 229 const char *
 230 isupport_maxlist(void *ptr)
 231 {
 232         static char result[30];
 233
 234         ircsnprintf(result, sizeof result, "bq%s%s:%i",
 235                         ConfigChannel.use_except ? "e" : "",
 236                         ConfigChannel.use_invex ? "I" : "",
 237                         ConfigChannel.max_bans);
 238         return result;
 239 }
 240
 241 const char *
 242 isupport_targmax(void *ptr)
 243 {
 244         static char result[200];
 245
 246         ircsnprintf(result, sizeof result, "NAMES:1,LIST:1,KICK:1,WHOIS:1,PRIVMSG:%d,NOTICE:%d,ACCEPT:,MONITOR:",
 247                         ConfigFileEntry.max_targets,
 248                         ConfigFileEntry.max_targets);
 249         return result;
 250 }
 251
 252 const char *
 253 isupport_extban(void *ptr)
 254 {
 255         const char *p;
 256         static char result[200];
 257
 258         p = get_extban_string();
 259         if (EmptyString(p))
 260                 return NULL;
 261         ircsnprintf(result, sizeof result, "$:%s", p);
 262         return result;
 263 }
 264
 265 void
 266 init_isupport(void)
 267 {
 268         static int maxmodes = MAXMODEPARAMS;
 269         static int nicklen = NICKLEN-1;
 270         static int channellen = LOC_CHANNELLEN;
 271         static int topiclen = TOPICLEN;
 272
 273         add_isupport("CHANTYPES", isupport_string, "&#");
 274         add_isupport("EXCEPTS", isupport_boolean, &ConfigChannel.use_except);
 275         add_isupport("INVEX", isupport_boolean, &ConfigChannel.use_invex);
 276         add_isupport("CHANMODES", isupport_chanmodes, NULL);
 277         add_isupport("CHANLIMIT", isupport_chanlimit, NULL);
 278         add_isupport("PREFIX", isupport_string, "(ov)@+");
 279         add_isupport("MAXLIST", isupport_maxlist, NULL);
 280         add_isupport("MODES", isupport_intptr, &maxmodes);
 281         add_isupport("NETWORK", isupport_stringptr, &ServerInfo.network_name);
 282         add_isupport("KNOCK", isupport_boolean, &ConfigChannel.use_knock);
 283         add_isupport("STATUSMSG", isupport_string, "@+");
 284         add_isupport("CALLERID", isupport_string, "g");
 285         add_isupport("SAFELIST", isupport_string, "");
 286         add_isupport("ELIST", isupport_string, "U");
 287         add_isupport("CASEMAPPING", isupport_string, "rfc1459");
 288         add_isupport("CHARSET", isupport_string, "ascii");
 289         add_isupport("NICKLEN", isupport_intptr, &nicklen);
 290         add_isupport("CHANNELLEN", isupport_intptr, &channellen);
 291         add_isupport("TOPICLEN", isupport_intptr, &topiclen);
 292         add_isupport("ETRACE", isupport_string, "");
 293         add_isupport("CPRIVMSG", isupport_string, "");
 294         add_isupport("CNOTICE", isupport_string, "");
 295         add_isupport("DEAF", isupport_string, "D");
 296         add_isupport("MONITOR", isupport_intptr, &ConfigFileEntry.max_monitor);
 297         add_isupport("FNC", isupport_string, "");
 298         add_isupport("TARGMAX", isupport_targmax, NULL);
 299         add_isupport("EXTBAN", isupport_extban, NULL);
 300 }