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


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