mirror of
https://github.com/moparisthebest/hexchat
synced 2024-12-23 16:18:52 -05:00
276 lines
6.7 KiB
C
276 lines
6.7 KiB
C
/* HexChat
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* Copyright (c) 2010-2012 Berke Viktor.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <malloc.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <openssl/sha.h>
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#include <glib.h>
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#ifdef WIN32
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#ifndef snprintf
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#define snprintf _snprintf
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#endif
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#ifndef stat64
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#define stat64 _stat64
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#endif
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#else
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/* for INT_MAX */
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#include <limits.h>
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#define __USE_LARGEFILE64
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#define _LARGEFILE_SOURCE
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#define _LARGEFILE64_SOURCE
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#endif
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#include <sys/stat.h>
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#include "xchat-plugin.h"
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#define BUFSIZE 32768
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#define DEFAULT_LIMIT 256 /* default size is 256 MiB */
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static xchat_plugin *ph; /* plugin handle */
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static const char name[] = "Checksum";
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static const char desc[] = "Calculate checksum for DCC file transfers";
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static const char version[] = "3.1";
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/* Use of OpenSSL SHA256 interface: http://adamlamers.com/?p=5 */
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static void
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sha256_hash_string (unsigned char hash[SHA256_DIGEST_LENGTH], char outputBuffer[65])
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{
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int i;
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for (i = 0; i < SHA256_DIGEST_LENGTH; i++)
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{
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sprintf (outputBuffer + (i * 2), "%02x", hash[i]);
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}
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outputBuffer[64] = 0;
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}
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static void
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sha256 (char *string, char outputBuffer[65])
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{
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int i;
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unsigned char hash[SHA256_DIGEST_LENGTH];
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SHA256_CTX sha256;
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SHA256_Init (&sha256);
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SHA256_Update (&sha256, string, strlen (string));
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SHA256_Final (hash, &sha256);
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for (i = 0; i < SHA256_DIGEST_LENGTH; i++)
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{
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sprintf (outputBuffer + (i * 2), "%02x", hash[i]);
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}
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outputBuffer[64] = 0;
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}
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static int
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sha256_file (char *path, char outputBuffer[65])
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{
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int bytesRead;
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unsigned char *buffer;
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unsigned char hash[SHA256_DIGEST_LENGTH];
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SHA256_CTX sha256;
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FILE *file = fopen (path, "rb");
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if (!file)
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{
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return -534;
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}
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SHA256_Init (&sha256);
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buffer = malloc (BUFSIZE);
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bytesRead = 0;
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if (!buffer)
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{
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return ENOMEM;
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}
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while ((bytesRead = fread (buffer, 1, BUFSIZE, file)))
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{
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SHA256_Update (&sha256, buffer, bytesRead);
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}
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SHA256_Final (hash, &sha256);
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sha256_hash_string (hash, outputBuffer);
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fclose (file);
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free (buffer);
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return 0;
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}
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static void
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set_limit (char* size)
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{
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int buffer = atoi (size);
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if (buffer > 0 && buffer < INT_MAX)
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{
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if (xchat_pluginpref_set_int (ph, "limit", buffer))
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{
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xchat_printf (ph, "File size limit has successfully been set to: %d MiB\n", buffer);
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}
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else
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{
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xchat_printf (ph, "File access error while saving!\n");
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}
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}
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else
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{
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xchat_printf (ph, "Invalid input!\n");
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}
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}
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static int
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get_limit ()
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{
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int size = xchat_pluginpref_get_int (ph, "limit");
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if (size <= -1 || size >= INT_MAX)
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{
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return DEFAULT_LIMIT;
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}
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else
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{
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return size;
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}
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}
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static void
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print_limit ()
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{
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xchat_printf (ph, "File size limit for checksums: %d MiB", get_limit ());
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}
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static int
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dccrecv_cb (char *word[], void *userdata)
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{
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int result;
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struct stat64 buffer; /* buffer for storing file info */
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char sum[65]; /* buffer for checksum */
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result = stat64 (word[2], &buffer);
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if (result == 0) /* stat returns 0 on success */
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{
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if (buffer.st_size <= (unsigned long long) get_limit () * 1048576)
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{
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sha256_file (word[2], sum); /* word[2] is the full filename */
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/* try to print the checksum in the privmsg tab of the sender */
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xchat_set_context (ph, xchat_find_context (ph, NULL, word[3]));
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xchat_printf (ph, "SHA-256 checksum for %s (local): %s\n", word[1], sum);
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}
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else
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{
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xchat_set_context (ph, xchat_find_context (ph, NULL, word[3]));
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xchat_printf (ph, "SHA-256 checksum for %s (local): (size limit reached, no checksum calculated, you can increase it with /CHECKSUM INC)\n", word[1]);
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}
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}
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else
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{
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xchat_printf (ph, "File access error!\n");
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}
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return XCHAT_EAT_NONE;
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}
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static int
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dccoffer_cb (char *word[], void *userdata)
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{
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int result;
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struct stat64 buffer; /* buffer for storing file info */
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char sum[65]; /* buffer for checksum */
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result = stat64 (word[3], &buffer);
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if (result == 0) /* stat returns 0 on success */
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{
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if (buffer.st_size <= (unsigned long long) get_limit () * 1048576)
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{
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sha256_file (word[3], sum); /* word[3] is the full filename */
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xchat_commandf (ph, "quote PRIVMSG %s :SHA-256 checksum for %s (remote): %s", word[2], word[1], sum);
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}
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else
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{
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xchat_set_context (ph, xchat_find_context (ph, NULL, word[3]));
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xchat_printf (ph, "quote PRIVMSG %s :SHA-256 checksum for %s (remote): (size limit reached, no checksum calculated)", word[2], word[1]);
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}
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}
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else
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{
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xchat_printf (ph, "File access error!\n");
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}
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return XCHAT_EAT_NONE;
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}
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static void
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checksum (char *word[], void *userdata)
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{
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if (!g_ascii_strcasecmp ("GET", word[2]))
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{
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print_limit ();
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}
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else if (!g_ascii_strcasecmp ("SET", word[2]))
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{
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set_limit (word[3]);
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}
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else
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{
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xchat_printf (ph, "Usage: /CHECKSUM GET|INC|DEC\n");
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xchat_printf (ph, " GET - print the maximum file size (in MiB) to be hashed\n");
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xchat_printf (ph, " SET <filesize> - set the maximum file size (in MiB) to be hashed\n");
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}
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}
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int
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xchat_plugin_init (xchat_plugin *plugin_handle, char **plugin_name, char **plugin_desc, char **plugin_version, char *arg)
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{
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ph = plugin_handle;
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*plugin_name = name;
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*plugin_desc = desc;
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*plugin_version = version;
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/* this is required for the very first run */
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if (xchat_pluginpref_get_int (ph, "limit") == -1)
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{
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xchat_pluginpref_set_int (ph, "limit", DEFAULT_LIMIT);
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}
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xchat_hook_command (ph, "CHECKSUM", XCHAT_PRI_NORM, checksum, "Usage: /CHECKSUM GET|SET", 0);
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xchat_hook_print (ph, "DCC RECV Complete", XCHAT_PRI_NORM, dccrecv_cb, NULL);
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xchat_hook_print (ph, "DCC Offer", XCHAT_PRI_NORM, dccoffer_cb, NULL);
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xchat_printf (ph, "%s plugin loaded\n", name);
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return 1;
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}
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int
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xchat_plugin_deinit (void)
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{
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xchat_printf (ph, "%s plugin unloaded\n", name);
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return 1;
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}
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