ircd/packet.c

   1 /*
   2  * IRC - Internet Relay Chat, common/packet.c
   3  * Copyright (C) 1990  Jarkko Oikarinen and
   4  *                     University of Oulu, Computing Center
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 1, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20 /** @file
  21  * @brief Input packet handling functions.
  22  * @version $Id: packet.c,v 1.14 2004/12/11 05:14:04 klmitch Exp $
  23  */
  24 #include "config.h"
  25
  26 #include "packet.h"
  27 #include "client.h"
  28 #include "ircd.h"
  29 #include "ircd_chattr.h"
  30 #include "ircd_log.h"
  31 #include "parse.h"
  32 #include "s_bsd.h"
  33 #include "s_misc.h"
  34 #include "send.h"
  35
  36 /* #include <assert.h> -- Now using assert in ircd_log.h */
  37
  38 /** Add a certain number of bytes to a client's received statistics.
  39  * @param[in,out] cptr Client to update.
  40  * @param[in] length Number of newly received bytes to add.
  41  */
  42 static void update_bytes_received(struct Client* cptr, unsigned int length)
  43 {
  44   cli_receiveB(&me)  += length;     /* Update bytes received */
  45   cli_receiveB(cptr) += length;
  46 }
  47
  48 /** Add one message to a client's received statistics.
  49  * @param[in,out] cptr Client to update.
  50  */
  51 static void update_messages_received(struct Client* cptr)
  52 {
  53   ++(cli_receiveM(&me));
  54   ++(cli_receiveM(cptr));
  55 }
  56
  57 /** Handle received data from a directly connected server.
  58  * @param[in] cptr Peer server that sent us data.
  59  * @param[in] buffer Input buffer.
  60  * @param[in] length Number of bytes in input buffer.
  61  * @return 1 on success or CPTR_KILLED if the client is squit.
  62  */
  63 int server_dopacket(struct Client* cptr, const char* buffer, int length)
  64 {
  65   const char* src;
  66   char*       endp;
  67   char*       client_buffer;
  68
  69   assert(0 != cptr);
  70
  71   update_bytes_received(cptr, length);
  72
  73   client_buffer = cli_buffer(cptr);
  74   endp = client_buffer + cli_count(cptr);
  75   src = buffer;
  76
  77   while (length-- > 0) {
  78     *endp = *src++;
  79     /*
  80      * Yuck.  Stuck.  To make sure we stay backward compatible,
  81      * we must assume that either CR or LF terminates the message
  82      * and not CR-LF.  By allowing CR or LF (alone) into the body
  83      * of messages, backward compatibility is lost and major
  84      * problems will arise. - Avalon
  85      */
  86     if (IsEol(*endp)) {
  87       if (endp == client_buffer)
  88         continue;               /* Skip extra LF/CR's */
  89       *endp = '\0';
  90
  91       update_messages_received(cptr);
  92
  93       if (parse_server(cptr, cli_buffer(cptr), endp) == CPTR_KILLED)
  94         return CPTR_KILLED;
  95       /*
  96        *  Socket is dead so exit
  97        */
  98       if (IsDead(cptr))
  99         return exit_client(cptr, cptr, &me, cli_info(cptr));
 100       endp = client_buffer;
 101     }
 102     else if (endp < client_buffer + BUFSIZE)
 103       ++endp;                   /* There is always room for the null */
 104   }
 105   cli_count(cptr) = endp - cli_buffer(cptr);
 106   return 1;
 107 }
 108
 109 /** Handle received data from a new (unregistered) connection.
 110  * @param[in] cptr Unregistered connection that sent us data.
 111  * @param[in] buffer Input buffer.
 112  * @param[in] length Number of bytes in input buffer.
 113  * @return 1 on success or CPTR_KILLED if the client is squit.
 114  */
 115 int connect_dopacket(struct Client *cptr, const char *buffer, int length)
 116 {
 117   const char* src;
 118   char*       endp;
 119   char*       client_buffer;
 120
 121   assert(0 != cptr);
 122
 123   update_bytes_received(cptr, length);
 124
 125   client_buffer = cli_buffer(cptr);
 126   endp = client_buffer + cli_count(cptr);
 127   src = buffer;
 128
 129   while (length-- > 0)
 130   {
 131     *endp = *src++;
 132     /*
 133      * Yuck.  Stuck.  To make sure we stay backward compatible,
 134      * we must assume that either CR or LF terminates the message
 135      * and not CR-LF.  By allowing CR or LF (alone) into the body
 136      * of messages, backward compatibility is lost and major
 137      * problems will arise. - Avalon
 138      */
 139     if (IsEol(*endp))
 140     {
 141       /* Skip extra LF/CR's */
 142       if (endp == client_buffer)
 143         continue;
 144       *endp = '\0';
 145
 146       update_messages_received(cptr);
 147
 148       if (parse_client(cptr, cli_buffer(cptr), endp) == CPTR_KILLED)
 149         return CPTR_KILLED;
 150       /* Socket is dead so exit */
 151       if (IsDead(cptr))
 152         return exit_client(cptr, cptr, &me, cli_info(cptr));
 153       else if (IsServer(cptr))
 154       {
 155         cli_count(cptr) = 0;
 156         return server_dopacket(cptr, src, length);
 157       }
 158       endp = client_buffer;
 159     }
 160     else if (endp < client_buffer + BUFSIZE)
 161       /* There is always room for the null */
 162       ++endp;
 163   }
 164   cli_count(cptr) = endp - cli_buffer(cptr);
 165   return 1;
 166 }
 167
 168 /** Handle received data from a local client.
 169  * @param[in] cptr Local client that sent us data.
 170  * @param[in] length Total number of bytes in client's input buffer.
 171  * @return 1 on success or CPTR_KILLED if the client is squit.
 172  */
 173 int client_dopacket(struct Client *cptr, unsigned int length)
 174 {
 175   assert(0 != cptr);
 176
 177   update_bytes_received(cptr, length);
 178   update_messages_received(cptr);
 179
 180   if (CPTR_KILLED == parse_client(cptr, cli_buffer(cptr), cli_buffer(cptr) + length))
 181     return CPTR_KILLED;
 182   else if (IsDead(cptr))
 183     return exit_client(cptr, cptr, &me, cli_info(cptr));
 184
 185   return 1;
 186 }
 187
 188