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
  19 #include "setup.h"
  20
  21 #include <sys/types.h>
  22
  23 #include <assert.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26 #include <string.h>
  27 #ifdef HAVE_LIBZ
  28 #include <zlib.h>
  29 #endif
  30
  31 #include "servlink.h"
  32 #include "io.h"
  33 #include "control.h"
  34
  35 static cmd_handler cmd_set_zip_out_level;
  36 static cmd_handler cmd_start_zip_out;
  37 static cmd_handler cmd_start_zip_in;
  38 static cmd_handler cmd_init;
  39
  40 struct command_def command_table[] = {
  41         {CMD_SET_ZIP_OUT_LEVEL, cmd_set_zip_out_level, COMMAND_FLAG_DATA},
  42         {CMD_START_ZIP_OUT, cmd_start_zip_out, 0},
  43         {CMD_START_ZIP_IN, cmd_start_zip_in, 0},
  44         {CMD_INJECT_RECVQ, process_recvq, COMMAND_FLAG_DATA},
  45         {CMD_INJECT_SENDQ, process_sendq, COMMAND_FLAG_DATA},
  46         {CMD_INIT, cmd_init, 0},
  47         {CMD_ZIPSTATS, send_zipstats, 0},
  48         {0, 0, 0}
  49 };
  50
  51 void
  52 cmd_set_zip_out_level(struct ctrl_command *cmd)
  53 {
  54 #ifdef HAVE_LIBZ
  55         out_state.zip_state.level = *cmd->data;
  56         if((out_state.zip_state.level < -1) || (out_state.zip_state.level > 9))
  57                 send_error("invalid compression level %d", out_state.zip_state.level);
  58 #else
  59         send_error("can't set compression level - no libz support!");
  60 #endif
  61 }
  62
  63 void
  64 cmd_start_zip_out(struct ctrl_command *cmd)
  65 {
  66 #ifdef HAVE_LIBZ
  67         int ret;
  68
  69         if(out_state.zip)
  70                 send_error("can't start compression - already started!");
  71
  72         out_state.zip_state.z_stream.total_in = 0;
  73         out_state.zip_state.z_stream.total_out = 0;
  74         out_state.zip_state.z_stream.zalloc = (alloc_func) 0;
  75         out_state.zip_state.z_stream.zfree = (free_func) 0;
  76         out_state.zip_state.z_stream.data_type = Z_ASCII;
  77
  78         if(out_state.zip_state.level <= 0)
  79                 out_state.zip_state.level = Z_DEFAULT_COMPRESSION;
  80
  81         if((ret = deflateInit(&out_state.zip_state.z_stream, out_state.zip_state.level)) != Z_OK)
  82                 send_error("deflateInit failed: %s", zError(ret));
  83
  84         out_state.zip = 1;
  85 #else
  86         send_error("can't start compression - no libz support!");
  87 #endif
  88 }
  89
  90 void
  91 cmd_start_zip_in(struct ctrl_command *cmd)
  92 {
  93 #ifdef HAVE_LIBZ
  94         int ret;
  95
  96         if(in_state.zip)
  97                 send_error("can't start decompression - already started!");
  98
  99         in_state.zip_state.z_stream.total_in = 0;
 100         in_state.zip_state.z_stream.total_out = 0;
 101         in_state.zip_state.z_stream.zalloc = (alloc_func) 0;
 102         in_state.zip_state.z_stream.zfree = (free_func) 0;
 103         in_state.zip_state.z_stream.data_type = Z_ASCII;
 104         if((ret = inflateInit(&in_state.zip_state.z_stream)) != Z_OK)
 105                 send_error("inflateInit failed: %s", zError(ret));
 106         in_state.zip = 1;
 107 #else
 108         send_error("can't start decompression - no libz support!");
 109 #endif
 110 }
 111
 112
 113 void
 114 cmd_init(struct ctrl_command *cmd)
 115 {
 116         if(in_state.active || out_state.active)
 117                 send_error("CMD_INIT sent twice!");
 118
 119         in_state.active = 1;
 120         out_state.active = 1;
 121         CONTROL.read_cb = read_ctrl;
 122         CONTROL.write_cb = NULL;
 123         LOCAL.read_cb = read_data;
 124         LOCAL.write_cb = NULL;
 125         REMOTE.read_cb = read_net;
 126         REMOTE.write_cb = NULL;
 127 }