ircd/m_sethost.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_sethost.c
   3  * Copyright (C) 1990 Jarkko Oikarinen and
   4  *                    University of Oulu, Computing Center
   5  *
   6  * See file AUTHORS in IRC package for additional names of
   7  * the programmers.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 1, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * $Id: asuka-sethost.patch,v 1.27 2005/02/13 17:28:11 froo Exp $
  24  */
  25
  26 /*
  27  * m_functions execute protocol messages on this server:
  28  *
  29  *    cptr    is always NON-NULL, pointing to a *LOCAL* client
  30  *            structure (with an open socket connected!). This
  31  *            identifies the physical socket where the message
  32  *            originated (or which caused the m_function to be
  33  *            executed--some m_functions may call others...).
  34  *
  35  *    sptr    is the source of the message, defined by the
  36  *            prefix part of the message if present. If not
  37  *            or prefix not found, then sptr==cptr.
  38  *
  39  *            (!IsServer(cptr)) => (cptr == sptr), because
  40  *            prefixes are taken *only* from servers...
  41  *
  42  *            (IsServer(cptr))
  43  *                    (sptr == cptr) => the message didn't
  44  *                    have the prefix.
  45  *
  46  *                    (sptr != cptr && IsServer(sptr) means
  47  *                    the prefix specified servername. (?)
  48  *
  49  *                    (sptr != cptr && !IsServer(sptr) means
  50  *                    that message originated from a remote
  51  *                    user (not local).
  52  *
  53  *            combining
  54  *
  55  *            (!IsServer(sptr)) means that, sptr can safely
  56  *            taken as defining the target structure of the
  57  *            message in this server.
  58  *
  59  *    *Always* true (if 'parse' and others are working correct):
  60  *
  61  *    1)      sptr->from == cptr  (note: cptr->from == cptr)
  62  *
  63  *    2)      MyConnect(sptr) <=> sptr == cptr (e.g. sptr
  64  *            *cannot* be a local connection, unless it's
  65  *            actually cptr!). [MyConnect(x) should probably
  66  *            be defined as (x == x->from) --msa ]
  67  *
  68  *    parc    number of variable parameter strings (if zero,
  69  *            parv is allowed to be NULL)
  70  *
  71  *    parv    a NULL terminated list of parameter pointers,
  72  *
  73  *                    parv[0], sender (prefix string), if not present
  74  *                            this points to an empty string.
  75  *                    parv[1]...parv[parc-1]
  76  *                            pointers to additional parameters
  77  *                    parv[parc] == NULL, *always*
  78  *
  79  *            note:   it is guaranteed that parv[0]..parv[parc-1] are all
  80  *                    non-NULL pointers.
  81  */
  82 #include "config.h"
  83
  84 #include "client.h"
  85 #include "ircd_reply.h"
  86 #include "ircd_string.h"
  87 #include "ircd_snprintf.h"
  88 #include "ircd_features.h"
  89 #include "msgq.h"
  90 #include "numeric.h"
  91 #include "s_conf.h"
  92 #include "s_user.h"
  93 #include "s_debug.h"
  94 #include "send.h"
  95 #include "struct.h"
  96 #include "numnicks.h"
  97
  98 #include "channel.h"
  99 #include "msg.h"
 100
 101 #include <assert.h>
 102 #include <stdlib.h>
 103
 104 /*
 105  * m_sethost - generic message handler
 106  *
 107  * mimic old lain syntax:
 108  *
 109  * (Oper) /SETHOST ident host.cc [quit-message]
 110  * (User) /SETHOST host.cc password
 111  * (Both) /SETHOST undo
 112  *
 113  * check for undo, prepend parv w. <nick> -h or +h
 114  */
 115 int m_sethost(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 116 {
 117   char hostmask[USERLEN + HOSTLEN + 2];
 118   char curhostmask[USERLEN + HOSTLEN + 2];
 119
 120   struct Flags setflags;
 121
 122   /* Back up the flags first */
 123   setflags = cli_flags(sptr);
 124
 125   if (parc < 2)
 126     return need_more_params(sptr, "SETHOST");
 127
 128   if (0 == ircd_strcmp("undo", parv[1])) {
 129     set_hostmask(sptr, NULL, NULL);
 130   } else {
 131     if (parc<3)
 132       return need_more_params(sptr, "SETHOST");
 133     if (IsAnOper(sptr)) {
 134       ircd_snprintf(0, hostmask, USERLEN + HOSTLEN + 2, "%s@%s", parv[1], parv[2]);
 135       if (!is_hostmask(hostmask)) {
 136         send_reply(sptr, ERR_BADHOSTMASK, hostmask);
 137         return 0;
 138       }
 139       if (IsSetHost(sptr) || IsAccount(sptr)) {
 140         ircd_snprintf(0, curhostmask, USERLEN + HOSTLEN + 2, "%s@%s", sptr->cli_user->username, sptr->cli_user->host);
 141         if (0 == strcmp(hostmask, curhostmask)) {
 142           send_reply(sptr, RPL_HOSTHIDDEN, curhostmask);
 143           return 0;
 144         }
 145       }
 146       if (set_hostmask(sptr, hostmask, NULL))
 147         FlagClr(&setflags, FLAG_SETHOST);
 148     } else {
 149       if (!is_hostmask(parv[1])) {
 150         send_reply(sptr, ERR_BADHOSTMASK, parv[1]);
 151         return 0;
 152       }
 153       if (IsSetHost(sptr) || IsAccount(sptr)) {
 154         if (0 == strcmp(parv[1], sptr->cli_user->host)) {
 155           send_reply(sptr, RPL_HOSTHIDDEN, parv[1]);
 156           return 0;
 157         }
 158       }
 159       if (set_hostmask(sptr, parv[1], parv[2]))
 160         FlagClr(&setflags, FLAG_SETHOST);
 161     }
 162   }
 163
 164   send_umode_out(cptr, sptr, &setflags, 0);
 165   return 0;
 166 }
 167
 168
 169 /*
 170  * ms_sethost - sethost server message handler
 171  *
 172  * parv[0] = sender prefix
 173  * parv[1] = target user numeric
 174  * parv[2] = target user's new ident
 175  * parv[3] = target user's new host
 176  */
 177 int ms_sethost(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 178 {
 179   struct Client *target;
 180   char hostmask[USERLEN + HOSTLEN + 2];
 181   struct Membership *chan;
 182   struct Flags setflags;
 183
 184   if (parc < 4)
 185     return need_more_params(sptr, "SETHOST");
 186
 187   if (!IsServer(sptr))
 188     return protocol_violation(cptr, "SETHOST from non-server %s",
 189                               cli_name(sptr));
 190
 191   /* Locate our target user; ignore the message if we can't */
 192   if(!(target = findNUser(parv[1])))
 193     return 0;
 194
 195   /* Fake host assignments must be from services */
 196   if (!find_conf_byhost(cli_confs(sptr), cli_name(sptr), CONF_UWORLD))
 197     return protocol_violation(cptr, "Non-U:lined server %s set fake host on user %s", cli_name(sptr), cli_name(target));
 198
 199   if (!MyConnect(target)) {
 200     sendcmdto_one(sptr, CMD_SETHOST, cli_user(target)->server, "%C %s %s", target,
 201                  parv[2], parv[3]);
 202     return 0;
 203   }
 204
 205   /* Back up the flags first */
 206   setflags = cli_flags(target);
 207   FlagClr(&setflags, FLAG_SETHOST);
 208
 209   if (IsSetHost(target) || IsAccount(target)) {
 210     if ((0 == strcmp(parv[2], target->cli_user->username)) && (0 == strcmp(parv[3], target->cli_user->host)))
 211       return 0;
 212   }
 213
 214   ircd_snprintf(0, hostmask, USERLEN + HOSTLEN + 2, "%s@%s", parv[2], parv[3]);
 215   if (!is_hostmask(hostmask))
 216     return protocol_violation(cptr, "Bad Host mask %s for user %s", hostmask, cli_name(target));
 217
 218   sendcmdto_common_channels_butone(target, CMD_QUIT, target, ":Host change");
 219
 220   /* Assign and propagate the fakehost */
 221   SetSetHost(target);
 222   ircd_strncpy(cli_user(target)->username, parv[2], USERLEN);
 223   ircd_strncpy(cli_user(target)->host, parv[3], HOSTLEN);
 224
 225   send_reply(target, RPL_HOSTHIDDEN, hostmask);
 226
 227   /*
 228    * Go through all channels the client was on, rejoin him
 229    * and set the modes, if any
 230    */
 231   for (chan = cli_user(target)->channel; chan; chan = chan->next_channel) {
 232     if (IsZombie(chan))
 233       continue;
 234     /* If this channel has delayed joins and the user has no modes, just set
 235      * the delayed join flag rather than showing the join, even if the user
 236      * was visible before */
 237     if (!IsChanOp(chan) && !HasVoice(chan)
 238         && (chan->channel->mode.mode & MODE_DELJOINS)) {
 239       SetDelayedJoin(chan);
 240     } else {
 241       sendcmdto_channel_butserv_butone(target, CMD_JOIN, chan->channel, target, 0,
 242         "%H", chan->channel);
 243     }
 244     if (IsChanOp(chan) && HasVoice(chan)) {
 245       sendcmdto_channel_butserv_butone(&his, CMD_MODE, chan->channel, target, 0,
 246         "%H +ov %C %C", chan->channel, target, target);
 247     } else if (IsChanOp(chan) || HasVoice(chan)) {
 248       sendcmdto_channel_butserv_butone(&his, CMD_MODE, chan->channel, target, 0,
 249         "%H +%c %C", chan->channel, IsChanOp(chan) ? 'o' : 'v', target);
 250     }
 251   }
 252
 253   send_umode_out(target, target, &setflags, 0);
 254   return 0;
 255 }