modules/core/m_part.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  m_part.c: Parts a user from a channel.
   4  *
   5  *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
   6  *  Copyright (C) 1996-2002 Hybrid Development Team
   7  *  Copyright (C) 2002-2005 ircd-ratbox development team
   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 2 of the License, or
  12  *  (at your option) 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  22  *  USA
  23  *
  24  *  $Id: m_part.c 98 2005-09-11 03:37:47Z nenolod $
  25  */
  26
  27 #include "stdinc.h"
  28 #include "channel.h"
  29 #include "client.h"
  30 #include "common.h"
  31 #include "hash.h"
  32 #include "match.h"
  33 #include "ircd.h"
  34 #include "numeric.h"
  35 #include "send.h"
  36 #include "s_serv.h"
  37 #include "msg.h"
  38 #include "parse.h"
  39 #include "modules.h"
  40 #include "s_conf.h"
  41 #include "packet.h"
  42 #include "inline/stringops.h"
  43 #include "hook.h"
  44
  45 static int m_part(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  46
  47 struct Message part_msgtab = {
  48         "PART", 0, 0, 0, MFLG_SLOW,
  49         {mg_unreg, {m_part, 2}, {m_part, 2}, mg_ignore, mg_ignore, {m_part, 2}}
  50 };
  51
  52 mapi_clist_av1 part_clist[] = { &part_msgtab, NULL };
  53
  54 DECLARE_MODULE_AV1(part, NULL, NULL, part_clist, NULL, NULL, "$Revision: 98 $");
  55
  56 static void part_one_client(struct Client *client_p,
  57                             struct Client *source_p, char *name,
  58                             const char *reason);
  59 static int can_send_part(struct Client *source_p, struct Channel *chptr, struct membership *msptr);
  60 static int do_message_hook(struct Client *source_p, struct Channel *chptr, const char **reason);
  61
  62
  63 /*
  64 ** m_part
  65 **      parv[1] = channel
  66 **      parv[2] = reason
  67 */
  68 static int
  69 m_part(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  70 {
  71         char *p, *name;
  72         char reason[REASONLEN + 1];
  73         char *s = LOCAL_COPY(parv[1]);
  74
  75         reason[0] = '\0';
  76
  77         if(parc > 2)
  78                 rb_strlcpy(reason, parv[2], sizeof(reason));
  79
  80         name = rb_strtok_r(s, ",", &p);
  81
  82         /* Finish the flood grace period... */
  83         if(MyClient(source_p) && !IsFloodDone(source_p))
  84                 flood_endgrace(source_p);
  85
  86         while(name)
  87         {
  88                 part_one_client(client_p, source_p, name, reason);
  89                 name = rb_strtok_r(NULL, ",", &p);
  90         }
  91         return 0;
  92 }
  93
  94 /*
  95  * part_one_client
  96  *
  97  * inputs       - pointer to server
  98  *              - pointer to source client to remove
  99  *              - char pointer of name of channel to remove from
 100  * output       - none
 101  * side effects - remove ONE client given the channel name
 102  */
 103 static void
 104 part_one_client(struct Client *client_p, struct Client *source_p, char *name, const char *reason)
 105 {
 106         struct Channel *chptr;
 107         struct membership *msptr;
 108
 109         if((chptr = find_channel(name)) == NULL)
 110         {
 111                 sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL, form_str(ERR_NOSUCHCHANNEL), name);
 112                 return;
 113         }
 114
 115         msptr = find_channel_membership(chptr, source_p);
 116         if(msptr == NULL)
 117         {
 118                 sendto_one_numeric(source_p, ERR_NOTONCHANNEL, form_str(ERR_NOTONCHANNEL), name);
 119                 return;
 120         }
 121
 122         if(MyConnect(source_p) && !IsOper(source_p) && !IsExemptSpambot(source_p))
 123                 check_spambot_warning(source_p, NULL);
 124
 125         /*
 126          *  Remove user from the old channel (if any)
 127          *  only allow /part reasons in -m chans
 128          */
 129         if(!EmptyString(reason) &&
 130                 (!MyConnect(source_p) ||
 131                  (can_send_part(source_p, chptr, msptr) && do_message_hook(source_p, chptr, &reason))
 132                 )
 133           )
 134         {
 135
 136                 sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
 137                               ":%s PART %s :%s", use_id(source_p), chptr->chname, reason);
 138                 sendto_channel_local(ALL_MEMBERS, chptr, ":%s!%s@%s PART %s :%s",
 139                                      source_p->name, source_p->username,
 140                                      source_p->host, chptr->chname, reason);
 141         }
 142         else
 143         {
 144                 sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
 145                               ":%s PART %s", use_id(source_p), chptr->chname);
 146                 sendto_channel_local(ALL_MEMBERS, chptr, ":%s!%s@%s PART %s",
 147                                      source_p->name, source_p->username,
 148                                      source_p->host, chptr->chname);
 149         }
 150         remove_user_from_channel(msptr);
 151 }
 152
 153 /*
 154  * can_send_part - whether a part message can be sent.
 155  *
 156  * inputs:
 157  *    - client parting
 158  *    - channel being parted
 159  *    - membership pointer
 160  * outputs:
 161  *    - 1 if message allowed
 162  *    - 0 if message denied
 163  * side effects:
 164  *    - none.
 165  */
 166 static int
 167 can_send_part(struct Client *source_p, struct Channel *chptr, struct membership *msptr)
 168 {
 169         if (!can_send(chptr, source_p, msptr))
 170                 return 0;
 171         /* Allow chanops to bypass anti_spam_exit_message_time for part messages. */
 172         if (is_chanop(msptr))
 173                 return 1;
 174         return (source_p->localClient->firsttime + ConfigFileEntry.anti_spam_exit_message_time) < rb_current_time();
 175 }
 176
 177 /*
 178  * do_message_hook - execute the message hook on a part message reason.
 179  *
 180  * inputs:
 181  *    - client parting
 182  *    - channel being parted
 183  *    - pointer to reason
 184  * outputs:
 185  *    - 1 if message is allowed
 186  *    - 0 if message is denied or message is now empty
 187  * side effects:
 188  *    - reason may be modified.
 189  */
 190 static int
 191 do_message_hook(struct Client *source_p, struct Channel *chptr, const char **reason)
 192 {
 193         hook_data_privmsg_channel hdata;
 194
 195         hdata.msgtype = MESSAGE_TYPE_PART;
 196         hdata.source_p = source_p;
 197         hdata.chptr = chptr;
 198         hdata.text = *reason;
 199         hdata.approved = 0;
 200
 201         call_hook(h_privmsg_channel, &hdata);
 202
 203         /* The reason may have been changed by a hook... */
 204         *reason = hdata.text;
 205
 206         return (hdata.approved == 0 && !EmptyString(*reason));
 207 }