ircd/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
  32 /* From the old supported.h which is
  33  *  Copyright (C) 1996-2002 Hybrid Development Team
  34  *  Copyright (C) 2002-2004 ircd-ratbox development team
  35  */
  36 /*
  37  * - from mirc's versions.txt
  38  *
  39  *  mIRC now supports the numeric 005 tokens: CHANTYPES=# and
  40  *  PREFIX=(ohv)@%+ and can handle a dynamic set of channel and
  41  *  nick prefixes.
  42  *
  43  *  mIRC assumes that @ is supported on all networks, any mode
  44  *  left of @ is assumed to have at least equal power to @, and
  45  *  any mode right of @ has less power.
  46  *
  47  *  mIRC has internal support for @%+ modes.
  48  *
  49  *  $nick() can now handle all mode letters listed in PREFIX.
  50  *
  51  *  Also added support for CHANMODES=A,B,C,D token (not currently
  52  *  supported by any servers), which lists all modes supported
  53  *  by a channel, where:
  54  *
  55  *    A = modes that take a parameter, and add or remove nicks
  56  *        or addresses to a list, such as +bIe for the ban,
  57  *        invite, and exception lists.
  58  *
  59  *    B = modes that change channel settings, but which take
  60  *        a parameter when they are set and unset, such as
  61  *        +k key, and -k key.
  62  *
  63  *    C = modes that change channel settings, but which take
  64  *        a parameter only when they are set, such as +l N,
  65  *        and -l.
  66  *
  67  *    D = modes that change channel settings, such as +imnpst
  68  *        and take no parameters.
  69  *
  70  *  All unknown/unlisted modes are treated as type D.
  71  */
  72
  73 #include "stdinc.h"
  74 #include "client.h"
  75 #include "numeric.h"
  76 #include "ircd.h"
  77 #include "s_conf.h"
  78 #include "s_user.h"
  79 #include "supported.h"
  80 #include "chmode.h"
  81 #include "send.h"
  82
  83 rb_dlink_list isupportlist;
  84
  85 struct isupportitem
  86 {
  87         const char *name;
  88         const char *(*func)(const void *);
  89         const void *param;
  90         rb_dlink_node node;
  91 };
  92
  93 void
  94 add_isupport(const char *name, const char *(*func)(const void *), const void *param)
  95 {
  96         struct isupportitem *item;
  97
  98         item = rb_malloc(sizeof(struct isupportitem));
  99         item->name = name;
 100         item->func = func;
 101         item->param = param;
 102         rb_dlinkAddTail(item, &item->node, &isupportlist);
 103 }
 104
 105 const void *
 106 change_isupport(const char *name, const char *(*func)(const void *), const void *param)
 107 {
 108         rb_dlink_node *ptr;
 109         struct isupportitem *item;
 110         const void *oldvalue = NULL;
 111
 112         RB_DLINK_FOREACH(ptr, isupportlist.head)
 113         {
 114                 item = ptr->data;
 115
 116                 if (!strcmp(item->name, name))
 117                 {
 118                         oldvalue = item->param;
 119
 120                         // item->name = name;
 121                         item->func = func;
 122                         item->param = param;
 123
 124                         break;
 125                 }
 126         }
 127
 128         return oldvalue;
 129 }
 130
 131 void
 132 delete_isupport(const char *name)
 133 {
 134         rb_dlink_node *ptr, *next_ptr;
 135         struct isupportitem *item;
 136
 137         RB_DLINK_FOREACH_SAFE(ptr, next_ptr, isupportlist.head)
 138         {
 139                 item = ptr->data;
 140
 141                 if (!strcmp(item->name, name))
 142                 {
 143                         rb_dlinkDelete(ptr, &isupportlist);
 144                         rb_free(item);
 145                 }
 146         }
 147 }
 148
 149 /* XXX caching? */
 150 void
 151 show_isupport(struct Client *client_p)
 152 {
 153         rb_dlink_node *ptr;
 154         struct isupportitem *item;
 155         const char *value;
 156         char buf[512];
 157         int extra_space;
 158         unsigned int nchars, nparams;
 159         int l;
 160
 161         extra_space = strlen(client_p->name);
 162         /* UID */
 163         if (!MyClient(client_p) && extra_space < 9)
 164                 extra_space = 9;
 165         /* :<me.name> 005 <nick> <params> :are supported by this server */
 166         /* form_str(RPL_ISUPPORT) is %s :are supported by this server */
 167         extra_space += strlen(me.name) + 1 + strlen(form_str(RPL_ISUPPORT));
 168
 169         nchars = extra_space, nparams = 0, buf[0] = '\0';
 170         RB_DLINK_FOREACH(ptr, isupportlist.head)
 171         {
 172                 item = ptr->data;
 173                 value = (*item->func)(item->param);
 174                 if (value == NULL)
 175                         continue;
 176                 l = strlen(item->name) + (EmptyString(value) ? 0 : 1 + strlen(value));
 177                 if (nchars + l + (nparams > 0) >= sizeof buf || nparams + 1 > 12)
 178                 {
 179                         sendto_one_numeric(client_p, RPL_ISUPPORT, form_str(RPL_ISUPPORT), buf);
 180                         nchars = extra_space, nparams = 0, buf[0] = '\0';
 181                 }
 182                 if (nparams > 0)
 183                         rb_strlcat(buf, " ", sizeof buf), nchars++;
 184                 rb_strlcat(buf, item->name, sizeof buf);
 185                 if (!EmptyString(value))
 186                 {
 187                         rb_strlcat(buf, "=", sizeof buf);
 188                         rb_strlcat(buf, value, sizeof buf);
 189                 }
 190                 nchars += l;
 191                 nparams++;
 192         }
 193         if (nparams > 0)
 194                 sendto_one_numeric(client_p, RPL_ISUPPORT, form_str(RPL_ISUPPORT), buf);
 195 }
 196
 197 const char *
 198 isupport_intptr(const void *ptr)
 199 {
 200         static char buf[15];
 201         snprintf(buf, sizeof buf, "%d", *(const int *)ptr);
 202         return buf;
 203 }
 204
 205 const char *
 206 isupport_boolean(const void *ptr)
 207 {
 208
 209         return *(const int *)ptr ? "" : NULL;
 210 }
 211
 212 const char *
 213 isupport_string(const void *ptr)
 214 {
 215
 216         return (const char *)ptr;
 217 }
 218
 219 const char *
 220 isupport_stringptr(const void *ptr)
 221 {
 222         return *(char * const *)ptr;
 223 }
 224
 225 static const char *
 226 isupport_umode(const void *ptr)
 227 {
 228         const char *str;
 229
 230         str = ptr;
 231         return ConfigFileEntry.oper_only_umodes &
 232                 user_modes[(unsigned char)*str] ? NULL : str;
 233 }
 234
 235 static const char *
 236 isupport_chanmodes(const void *ptr)
 237 {
 238         static char result[80];
 239
 240         snprintf(result, sizeof result, "%s%sbq,k,%slj,%s",
 241                         ConfigChannel.use_except ? "e" : "",
 242                         ConfigChannel.use_invex ? "I" : "",
 243                         ConfigChannel.use_forward ? "f" : "",
 244                         cflagsbuf);
 245         return result;
 246 }
 247
 248 static const char *
 249 isupport_chantypes(const void *ptr)
 250 {
 251         return ConfigChannel.disable_local_channels ? "#" : "&#";
 252 }
 253
 254 static const char *
 255 isupport_chanlimit(const void *ptr)
 256 {
 257         static char result[30];
 258
 259         snprintf(result, sizeof result, "%s:%i",
 260                 ConfigChannel.disable_local_channels ? "#" : "&#", ConfigChannel.max_chans_per_user);
 261         return result;
 262 }
 263
 264 static const char *
 265 isupport_maxlist(const void *ptr)
 266 {
 267         static char result[30];
 268
 269         snprintf(result, sizeof result, "bq%s%s:%i",
 270                         ConfigChannel.use_except ? "e" : "",
 271                         ConfigChannel.use_invex ? "I" : "",
 272                         ConfigChannel.max_bans);
 273         return result;
 274 }
 275
 276 static const char *
 277 isupport_targmax(const void *ptr)
 278 {
 279         static char result[200];
 280
 281         snprintf(result, sizeof result, "NAMES:1,LIST:1,KICK:1,WHOIS:1,PRIVMSG:%d,NOTICE:%d,ACCEPT:,MONITOR:",
 282                         ConfigFileEntry.max_targets,
 283                         ConfigFileEntry.max_targets);
 284         return result;
 285 }
 286
 287 static const char *
 288 isupport_extban(const void *ptr)
 289 {
 290         const char *p;
 291         static char result[200];
 292
 293         p = get_extban_string();
 294         if (EmptyString(p))
 295                 return NULL;
 296         snprintf(result, sizeof result, "$,%s", p);
 297         return result;
 298 }
 299
 300 static const char *
 301 isupport_nicklen(const void *ptr)
 302 {
 303         static char result[200];
 304
 305         snprintf(result, sizeof result, "%u", ConfigFileEntry.nicklen - 1);
 306         return result;
 307 }
 308
 309 void
 310 init_isupport(void)
 311 {
 312         static int maxmodes = MAXMODEPARAMS;
 313         static int channellen = LOC_CHANNELLEN;
 314         static int topiclen = TOPICLEN;
 315         static int maxnicklen = NICKLEN - 1;
 316
 317         add_isupport("CHANTYPES", isupport_chantypes, NULL);
 318         add_isupport("EXCEPTS", isupport_boolean, &ConfigChannel.use_except);
 319         add_isupport("INVEX", isupport_boolean, &ConfigChannel.use_invex);
 320         add_isupport("CHANMODES", isupport_chanmodes, NULL);
 321         add_isupport("CHANLIMIT", isupport_chanlimit, NULL);
 322         add_isupport("PREFIX", isupport_string, "(ov)@+");
 323         add_isupport("MAXLIST", isupport_maxlist, NULL);
 324         add_isupport("MODES", isupport_intptr, &maxmodes);
 325         add_isupport("NETWORK", isupport_stringptr, &ServerInfo.network_name);
 326         add_isupport("STATUSMSG", isupport_string, "@+");
 327         add_isupport("CALLERID", isupport_umode, "g");
 328         add_isupport("CASEMAPPING", isupport_string, "rfc1459");
 329         add_isupport("NICKLEN", isupport_nicklen, NULL);
 330         add_isupport("MAXNICKLEN", isupport_intptr, &maxnicklen);
 331         add_isupport("CHANNELLEN", isupport_intptr, &channellen);
 332         add_isupport("TOPICLEN", isupport_intptr, &topiclen);
 333         add_isupport("DEAF", isupport_umode, "D");
 334         add_isupport("TARGMAX", isupport_targmax, NULL);
 335         add_isupport("EXTBAN", isupport_extban, NULL);
 336         add_isupport("CLIENTVER", isupport_string, "3.0");
 337 }