modules/core/m_error.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  m_error.c: Handles error messages from the other end.
   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
  25 #include "stdinc.h"
  26 #include "client.h"
  27 #include "common.h"
  28 #include "ircd.h"
  29 #include "numeric.h"
  30 #include "send.h"
  31 #include "msg.h"
  32 #include "modules.h"
  33 #include "logger.h"
  34 #include "s_conf.h"
  35
  36 static const char error_desc[] =
  37         "Provides the ERROR command for clients and servers";
  38
  39 static void m_error(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  40 static void ms_error(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  41
  42 struct Message error_msgtab = {
  43         "ERROR", 0, 0, 0, 0,
  44         {{m_error, 0}, mg_ignore, mg_ignore, {ms_error, 0}, mg_ignore, mg_ignore}
  45 };
  46
  47 mapi_clist_av1 error_clist[] = {
  48         &error_msgtab, NULL
  49 };
  50
  51 DECLARE_MODULE_AV2(error, NULL, NULL, error_clist, NULL, NULL, NULL, NULL, error_desc);
  52
  53 /* Determine whether an ERROR message is safe to show (no IP address in it) */
  54 static bool
  55 is_safe_error(const char *message)
  56 {
  57         char prefix2[100];
  58         const char *p;
  59
  60         if (!strncmp(message, "Closing Link: 127.0.0.1 (", 25))
  61                 return true;
  62         snprintf(prefix2, sizeof prefix2,
  63                         "Closing Link: 127.0.0.1 %s (", me.name);
  64         if (!strncmp(message, prefix2, strlen(prefix2)))
  65                 return true;
  66         if (!strncmp(message, "Restart by ", 11))
  67                 return true;
  68         if (!strncmp(message, "Terminated by ", 14))
  69                 return true;
  70
  71         if (!strncasecmp(message, "Closing Link", 12))
  72                 return false;
  73         if (strchr(message, '['))
  74                 return false;
  75         p = strchr(message, '.');
  76         if (p != NULL && p[1] != '\0')
  77                 return false;
  78         if (strchr(message, ':'))
  79                 return false;
  80
  81         return true;
  82 }
  83
  84 /*
  85  * Note: At least at protocol level ERROR has only one parameter,
  86  * although this is called internally from other functions
  87  * --msa
  88  *
  89  *      parv[*] = parameters
  90  */
  91 static void
  92 m_error(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  93 {
  94         const char *para;
  95         int hideit = ConfigFileEntry.hide_error_messages;
  96
  97         para = (parc > 1 && *parv[1] != '\0') ? parv[1] : "<>";
  98
  99         if (IsAnyServer(client_p))
 100         {
 101                 ilog(L_SERVER, "Received ERROR message from %s: %s",
 102                      log_client_name(source_p, SHOW_IP), para);
 103         }
 104
 105         if(is_safe_error(para))
 106                 hideit = 0;
 107         if(IsAnyServer(client_p))
 108         {
 109                 if (hideit < 2)
 110                         sendto_realops_snomask(SNO_GENERAL, hideit ? L_ADMIN : (is_remote_connect(client_p) ? L_NETWIDE : L_ALL),
 111                                         "ERROR :from %s -- %s",
 112                                         client_p->name, para);
 113                 if (hideit > 0)
 114                         sendto_realops_snomask(SNO_GENERAL, (hideit == 1 ? L_OPER : L_ALL) | (is_remote_connect(client_p) ? L_NETWIDE : L_ALL),
 115                                         "ERROR :from %s -- <hidden>",
 116                                         client_p->name);
 117         }
 118
 119         exit_client(client_p, source_p, source_p, "ERROR");
 120 }
 121
 122 static void
 123 ms_error(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 124 {
 125         const char *para;
 126         int hideit = ConfigFileEntry.hide_error_messages;
 127
 128         para = (parc > 1 && *parv[1] != '\0') ? parv[1] : "<>";
 129
 130         ilog(L_SERVER, "Received ERROR message from %s: %s",
 131              log_client_name(source_p, SHOW_IP), para);
 132
 133         if(is_safe_error(para))
 134                 hideit = 0;
 135         if(hideit == 2)
 136                 return;
 137
 138         if(client_p == source_p)
 139         {
 140                 sendto_realops_snomask(SNO_GENERAL, hideit ? L_ADMIN : L_ALL, "ERROR :from %s -- %s",
 141                                      client_p->name, para);
 142         }
 143         else
 144         {
 145                 sendto_realops_snomask(SNO_GENERAL, hideit ? L_ADMIN : L_ALL, "ERROR :from %s via %s -- %s",
 146                                      source_p->name, client_p->name, para);
 147         }
 148 }