servlink/control.c

   1 /************************************************************************
   2  *   IRC - Internet Relay Chat, servlink/servlink.c
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License as published by
   6  *   the Free Software Foundation; either version 1, or (at your option)
   7  *   any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program; if not, write to the Free Software
  16  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  *
  18  *   $Id: control.c 1285 2006-05-05 15:03:53Z nenolod $
  19  */
  20
  21 #include "setup.h"
  22
  23 #include <sys/types.h>
  24
  25 #include <assert.h>
  26 #include <stdio.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #ifdef HAVE_LIBZ
  30 #include <zlib.h>
  31 #endif
  32
  33 #include "servlink.h"
  34 #include "io.h"
  35 #include "control.h"
  36
  37 static cmd_handler cmd_set_zip_out_level;
  38 static cmd_handler cmd_start_zip_out;
  39 static cmd_handler cmd_start_zip_in;
  40 static cmd_handler cmd_init;
  41
  42 struct command_def command_table[] = {
  43         {CMD_SET_ZIP_OUT_LEVEL, cmd_set_zip_out_level, COMMAND_FLAG_DATA},
  44         {CMD_START_ZIP_OUT, cmd_start_zip_out, 0},
  45         {CMD_START_ZIP_IN, cmd_start_zip_in, 0},
  46         {CMD_INJECT_RECVQ, process_recvq, COMMAND_FLAG_DATA},
  47         {CMD_INJECT_SENDQ, process_sendq, COMMAND_FLAG_DATA},
  48         {CMD_INIT, cmd_init, 0},
  49         {CMD_ZIPSTATS, send_zipstats, 0},
  50         {0, 0, 0}
  51 };
  52
  53 void
  54 cmd_set_zip_out_level(struct ctrl_command *cmd)
  55 {
  56 #ifdef HAVE_LIBZ
  57         out_state.zip_state.level = *cmd->data;
  58         if((out_state.zip_state.level < -1) || (out_state.zip_state.level > 9))
  59                 send_error("invalid compression level %d", out_state.zip_state.level);
  60 #else
  61         send_error("can't set compression level - no libz support!");
  62 #endif
  63 }
  64
  65 void
  66 cmd_start_zip_out(struct ctrl_command *cmd)
  67 {
  68 #ifdef HAVE_LIBZ
  69         int ret;
  70
  71         if(out_state.zip)
  72                 send_error("can't start compression - already started!");
  73
  74         out_state.zip_state.z_stream.total_in = 0;
  75         out_state.zip_state.z_stream.total_out = 0;
  76         out_state.zip_state.z_stream.zalloc = (alloc_func) 0;
  77         out_state.zip_state.z_stream.zfree = (free_func) 0;
  78         out_state.zip_state.z_stream.data_type = Z_ASCII;
  79
  80         if(out_state.zip_state.level <= 0)
  81                 out_state.zip_state.level = Z_DEFAULT_COMPRESSION;
  82
  83         if((ret = deflateInit(&out_state.zip_state.z_stream, out_state.zip_state.level)) != Z_OK)
  84                 send_error("deflateInit failed: %s", zError(ret));
  85
  86         out_state.zip = 1;
  87 #else
  88         send_error("can't start compression - no libz support!");
  89 #endif
  90 }
  91
  92 void
  93 cmd_start_zip_in(struct ctrl_command *cmd)
  94 {
  95 #ifdef HAVE_LIBZ
  96         int ret;
  97
  98         if(in_state.zip)
  99                 send_error("can't start decompression - already started!");
 100
 101         in_state.zip_state.z_stream.total_in = 0;
 102         in_state.zip_state.z_stream.total_out = 0;
 103         in_state.zip_state.z_stream.zalloc = (alloc_func) 0;
 104         in_state.zip_state.z_stream.zfree = (free_func) 0;
 105         in_state.zip_state.z_stream.data_type = Z_ASCII;
 106         if((ret = inflateInit(&in_state.zip_state.z_stream)) != Z_OK)
 107                 send_error("inflateInit failed: %s", zError(ret));
 108         in_state.zip = 1;
 109 #else
 110         send_error("can't start decompression - no libz support!");
 111 #endif
 112 }
 113
 114
 115 void
 116 cmd_init(struct ctrl_command *cmd)
 117 {
 118         if(in_state.active || out_state.active)
 119                 send_error("CMD_INIT sent twice!");
 120
 121         in_state.active = 1;
 122         out_state.active = 1;
 123         CONTROL.read_cb = read_ctrl;
 124         CONTROL.write_cb = NULL;
 125         LOCAL.read_cb = read_data;
 126         LOCAL.write_cb = NULL;
 127         REMOTE.read_cb = read_net;
 128         REMOTE.write_cb = NULL;
 129 }