352 lines
8.8 KiB
C
352 lines
8.8 KiB
C
/* XChat-WDK
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* Copyright (c) 2010-2011 Berke Viktor.
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*
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* Use of OpenSSL SHA256 interface: http://adamlamers.com/?p=5
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <string.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 <sys/stat.h>
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#include <openssl/sha.h>
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#include "xchat-plugin.h"
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#define BUFSIZE 32768
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#define DEFAULT_MAX_HASH_SIZE 268435456 /* default size is 256 MB */
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#define FILE_BUF_SIZE 512
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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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static xchat_plugin *ph; /* plugin handle */
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static int config_fail; /* variable for config availability */
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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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init ()
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{
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/* check whether the config file exists, if it doesn't, try to create it */
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FILE * file_in;
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FILE * file_out;
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char buffer[FILE_BUF_SIZE];
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config_fail = 0;
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snprintf (buffer, sizeof (buffer), "%s/checksum.conf", xchat_get_info (ph, "xchatdirfs"));
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if ((file_in = fopen (buffer, "r")) == NULL)
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{
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if ((file_out = fopen (buffer, "w")) == NULL)
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{
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config_fail = 1;
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} else
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{
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fprintf (file_out, "%llu\n", (unsigned long long) DEFAULT_MAX_HASH_SIZE);
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fclose (file_out);
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}
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} else
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{
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fclose (file_in);
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}
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/* nasty easter egg: if FILE_BUF_SIZE is set to 1024 and you build for x86, you can do fclose ()
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at the end of init (), which is plain wrong as it will only work if fopen () != 0. */
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}
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static unsigned long long
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get_max_hash_size ()
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{
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FILE * file_in;
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char buffer[FILE_BUF_SIZE];
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unsigned long long max_hash_size;
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if (config_fail)
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{
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return (unsigned long long) DEFAULT_MAX_HASH_SIZE;
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} else
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{
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snprintf (buffer, sizeof (buffer), "%s/checksum.conf", xchat_get_info (ph, "xchatdirfs"));
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file_in = fopen (buffer, "r");
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fscanf (file_in, "%llu", &max_hash_size);
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fclose (file_in);
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return max_hash_size;
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}
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}
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static void
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print_size ()
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{
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unsigned long long size;
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char suffix[3];
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size = get_max_hash_size ();
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if (size >= 1073741824)
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{
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size /= 1073741824;
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snprintf (suffix, sizeof (suffix), "GB");
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} else if (size >= 1048576)
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{
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size /= 1048576;
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snprintf (suffix, sizeof (suffix), "MB");
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} else if (size >= 1024)
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{
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size /= 1024;
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snprintf (suffix, sizeof (suffix), "kB");
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} else
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{
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snprintf (suffix, sizeof (suffix), "B");
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}
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xchat_printf (ph, "File size limit for checksums: %llu %s\n", size, suffix);
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}
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static void
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increase_max_hash_size ()
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{
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unsigned long long size;
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FILE * file_out;
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char buffer[FILE_BUF_SIZE];
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if (config_fail)
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{
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xchat_printf (ph, "Config file is unavailable, falling back to the default value\n");
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print_size ();
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} else
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{
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size = get_max_hash_size ();
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if (size <= ULLONG_MAX/2)
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{
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size *= 2;
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}
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snprintf (buffer, sizeof (buffer), "%s/checksum.conf", xchat_get_info (ph, "xchatdirfs"));
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file_out = fopen (buffer, "w");
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fprintf (file_out, "%llu\n", size);
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fclose (file_out);
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print_size ();
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}
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}
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static void
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decrease_max_hash_size ()
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{
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unsigned long long size;
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FILE * file_out;
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char buffer[FILE_BUF_SIZE];
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if (config_fail)
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{
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xchat_printf (ph, "Config file is unavailable, falling back to the default value\n");
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print_size ();
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} else
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{
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size = get_max_hash_size ();
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if (size >= 2)
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{
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size /= 2;
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}
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snprintf (buffer, sizeof (buffer), "%s/checksum.conf", xchat_get_info (ph, "xchatdirfs"));
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file_out = fopen (buffer, "w");
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fprintf (file_out, "%llu\n", size);
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fclose (file_out);
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print_size ();
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}
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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 <= get_max_hash_size ())
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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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} 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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} 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 <= get_max_hash_size ())
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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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} 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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} 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 (!stricmp ("GET", word[2]))
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{
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print_size ();
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} else if (!stricmp ("INC", word[2]))
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{
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increase_max_hash_size ();
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} else if (!stricmp ("DEC", word[2]))
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{
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decrease_max_hash_size ();
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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 to be hashed\n");
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xchat_printf (ph, " INC - double the maximum file size to be hashed\n");
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xchat_printf (ph, " DEC - halve the maximum file size 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 = "Checksum";
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*plugin_desc = "Calculate checksum for DCC file transfers";
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*plugin_version = "2.0";
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init ();
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xchat_hook_command (ph, "CHECKSUM", XCHAT_PRI_NORM, checksum, "Usage: /CHECKSUM GET|INC|DEC", 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_print (ph, "Checksum plugin loaded\n");
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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_print (ph, "Checksum plugin unloaded\n");
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return 1;
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}
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