update.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:51k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * update.c: VLC update checking and downloading
- *****************************************************************************
- * Copyright © 2005-2008 the VideoLAN team
- * $Id: e4e5d0161530771d5a09b3636eb87dab07794a27 $
- *
- * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
- * Rémi Duraffort <ivoire at via.ecp.fr>
- Rafaël Carré <funman@videolanorg>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either release 2 of the License, or
- * (at your option) any later release.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- *****************************************************************************/
- /**
- * file
- * This file contains functions related to VLC update management
- */
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_update.h>
- #ifdef UPDATE_CHECK
- #include <assert.h>
- #include <vlc_pgpkey.h>
- #include <vlc_stream.h>
- #include <vlc_strings.h>
- #include <vlc_charset.h>
- #include <vlc_dialog.h>
- #include <gcrypt.h>
- #include <vlc_gcrypt.h>
- #include "update.h"
- #include "../libvlc.h"
- /*****************************************************************************
- * Misc defines
- *****************************************************************************/
- /*
- * Here is the format of these "status files" :
- * First line is the last version: "X.Y.Ze" where:
- * * X is the major number
- * * Y is the minor number
- * * Z is the revision number
- * * e is an OPTIONAL extra letter
- * * AKA "0.8.6d" or "0.9.0"
- * Second line is an url of the binary for this last version
- * Remaining text is a required description of the update
- */
- #if defined( UNDER_CE )
- # define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status-ce"
- #elif defined( WIN32 )
- # define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status-win-x86"
- #elif defined( __APPLE__ )
- # if defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
- # define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status-mac-ppc"
- # else
- # define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status-mac-x86"
- # endif
- #elif defined( SYS_BEOS )
- # define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status-beos-x86"
- #else
- # define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status"
- #endif
- /*****************************************************************************
- * OpenPGP functions
- *****************************************************************************/
- #define packet_type( c ) ( ( c & 0x3c ) >> 2 ) /* 0x3C = 00111100 */
- #define packet_header_len( c ) ( ( c & 0x03 ) + 1 ) /* number of bytes in a packet header */
- static inline int scalar_number( uint8_t *p, int header_len )
- {
- assert( header_len == 1 || header_len == 2 || header_len == 4 );
- if( header_len == 1 )
- return( p[0] );
- else if( header_len == 2 )
- return( (p[0] << 8) + p[1] );
- else if( header_len == 4 )
- return( (p[0] << 24) + (p[1] << 16) + (p[2] << 8) + p[3] );
- abort(); /* to shut up GCC warning */
- }
- /* number of data bytes in a MPI */
- #define mpi_len( mpi ) ( ( scalar_number( mpi, 2 ) + 7 ) / 8 )
- /*
- * fill a public_key_packet_t structure from public key packet data
- * verify that it is a version 4 public key packet, using DSA
- */
- static int parse_public_key_packet( public_key_packet_t *p_key, uint8_t *p_buf,
- size_t i_packet_len )
- {
- if( i_packet_len > 418 || i_packet_len < 6 )
- return VLC_EGENERIC;
- size_t i_read = 0;
- p_key->version = *p_buf++; i_read++;
- if( p_key->version != 4 )
- return VLC_EGENERIC;
- /* XXX: warn when timestamp is > date ? */
- memcpy( p_key->timestamp, p_buf, 4 ); p_buf += 4; i_read += 4;
- p_key->algo = *p_buf++; i_read++;
- if( p_key->algo != PUBLIC_KEY_ALGO_DSA )
- return VLC_EGENERIC;
- /* read p */
- if( i_read + 2 > i_packet_len )
- return VLC_EGENERIC;
- int i_p_len = mpi_len( p_buf );
- if( i_p_len > 128 || i_read + 2 + i_p_len > i_packet_len )
- return VLC_EGENERIC;
- memcpy( p_key->p, p_buf, 2+i_p_len );
- p_buf += 2+i_p_len; i_read += 2+i_p_len;
- /* read q */
- if( i_read + 2 > i_packet_len )
- return VLC_EGENERIC;
- int i_q_len = mpi_len( p_buf );
- if( i_q_len > 20 || i_read+2+i_q_len > i_packet_len )
- return VLC_EGENERIC;
- memcpy( p_key->q, p_buf, 2+i_q_len );
- p_buf += 2+i_q_len; i_read += 2+i_q_len;
- /* read g */
- if( i_read + 2 > i_packet_len )
- return VLC_EGENERIC;
- int i_g_len = mpi_len( p_buf );
- if( i_g_len > 128 || i_read+2+i_g_len > i_packet_len )
- return VLC_EGENERIC;
- memcpy( p_key->g, p_buf, 2+i_g_len );
- p_buf += 2+i_g_len; i_read += 2+i_g_len;
- /* read y */
- if( i_read + 2 > i_packet_len )
- return VLC_EGENERIC;
- int i_y_len = mpi_len( p_buf );
- if( i_y_len > 128 || i_read+2+i_y_len > i_packet_len )
- return VLC_EGENERIC;
- memcpy( p_key->y, p_buf, 2+i_y_len );
- i_read += 2+i_y_len;
- if( i_read != i_packet_len ) /* some extra data eh ? */
- return VLC_EGENERIC;
- return VLC_SUCCESS;
- }
- static size_t parse_signature_v3_packet( signature_packet_t *p_sig,
- uint8_t *p_buf, size_t i_sig_len )
- {
- size_t i_read = 1; /* we already read the version byte */
- if( i_sig_len < 19 ) /* signature is at least 19 bytes + the 2 MPIs */
- return 0;
- p_sig->specific.v3.hashed_data_len = *p_buf++; i_read++;
- if( p_sig->specific.v3.hashed_data_len != 5 )
- return 0;
- p_sig->type = *p_buf++; i_read++;
- memcpy( p_sig->specific.v3.timestamp, p_buf, 4 );
- p_buf += 4; i_read += 4;
- memcpy( p_sig->issuer_longid, p_buf, 8 );
- p_buf += 8; i_read += 8;
- p_sig->public_key_algo = *p_buf++; i_read++;
- p_sig->digest_algo = *p_buf++; i_read++;
- p_sig->hash_verification[0] = *p_buf++; i_read++;
- p_sig->hash_verification[1] = *p_buf++; i_read++;
- assert( i_read == 19 );
- return i_read;
- }
- /*
- * fill a signature_packet_v4_t from signature packet data
- * verify that it was used with a DSA public key, using SHA-1 digest
- */
- static size_t parse_signature_v4_packet( signature_packet_t *p_sig,
- uint8_t *p_buf, size_t i_sig_len )
- {
- size_t i_read = 1; /* we already read the version byte */
- if( i_sig_len < 10 ) /* signature is at least 10 bytes + the 2 MPIs */
- return 0;
- p_sig->type = *p_buf++; i_read++;
- p_sig->public_key_algo = *p_buf++; i_read++;
- p_sig->digest_algo = *p_buf++; i_read++;
- memcpy( p_sig->specific.v4.hashed_data_len, p_buf, 2 );
- p_buf += 2; i_read += 2;
- size_t i_hashed_data_len =
- scalar_number( p_sig->specific.v4.hashed_data_len, 2 );
- i_read += i_hashed_data_len;
- if( i_read + 4 > i_sig_len )
- return 0;
- p_sig->specific.v4.hashed_data = (uint8_t*) malloc( i_hashed_data_len );
- if( !p_sig->specific.v4.hashed_data )
- return 0;
- memcpy( p_sig->specific.v4.hashed_data, p_buf, i_hashed_data_len );
- p_buf += i_hashed_data_len;
- memcpy( p_sig->specific.v4.unhashed_data_len, p_buf, 2 );
- p_buf += 2; i_read += 2;
- size_t i_unhashed_data_len =
- scalar_number( p_sig->specific.v4.unhashed_data_len, 2 );
- i_read += i_unhashed_data_len;
- if( i_read + 2 > i_sig_len )
- return 0;
- p_sig->specific.v4.unhashed_data = (uint8_t*) malloc( i_unhashed_data_len );
- if( !p_sig->specific.v4.unhashed_data )
- return 0;
- memcpy( p_sig->specific.v4.unhashed_data, p_buf, i_unhashed_data_len );
- p_buf += i_unhashed_data_len;
- memcpy( p_sig->hash_verification, p_buf, 2 );
- p_buf += 2; i_read += 2;
- uint8_t *p, *max_pos;
- p = p_sig->specific.v4.unhashed_data;
- max_pos = p + scalar_number( p_sig->specific.v4.unhashed_data_len, 2 );
- for( ;; )
- {
- if( p > max_pos )
- return 0;
- size_t i_subpacket_len;
- if( *p < 192 )
- {
- if( p + 1 > max_pos )
- return 0;
- i_subpacket_len = *p++;
- }
- else if( *p < 255 )
- {
- if( p + 2 > max_pos )
- return 0;
- i_subpacket_len = (*p++ - 192) << 8;
- i_subpacket_len += *p++ + 192;
- }
- else
- {
- if( p + 4 > max_pos )
- return 0;
- i_subpacket_len = *++p << 24;
- i_subpacket_len += *++p << 16;
- i_subpacket_len += *++p << 8;
- i_subpacket_len += *++p;
- }
- if( *p == ISSUER_SUBPACKET )
- {
- if( p + 9 > max_pos )
- return 0;
- memcpy( &p_sig->issuer_longid, p+1, 8 );
- return i_read;
- }
- p += i_subpacket_len;
- }
- }
- static int parse_signature_packet( signature_packet_t *p_sig,
- uint8_t *p_buf, size_t i_sig_len )
- {
- if( !i_sig_len ) /* 1st sanity check, we need at least the version */
- return VLC_EGENERIC;
- p_sig->version = *p_buf++;
- size_t i_read;
- switch( p_sig->version )
- {
- case 3:
- i_read = parse_signature_v3_packet( p_sig, p_buf, i_sig_len );
- break;
- case 4:
- p_sig->specific.v4.hashed_data = NULL;
- p_sig->specific.v4.unhashed_data = NULL;
- i_read = parse_signature_v4_packet( p_sig, p_buf, i_sig_len );
- break;
- default:
- return VLC_EGENERIC;
- }
- if( i_read == 0 ) /* signature packet parsing has failed */
- goto error;
- if( p_sig->public_key_algo != PUBLIC_KEY_ALGO_DSA )
- goto error;
- if( p_sig->digest_algo != DIGEST_ALGO_SHA1 )
- goto error;
- switch( p_sig->type )
- {
- case BINARY_SIGNATURE:
- case TEXT_SIGNATURE:
- case GENERIC_KEY_SIGNATURE:
- case PERSONA_KEY_SIGNATURE:
- case CASUAL_KEY_SIGNATURE:
- case POSITIVE_KEY_SIGNATURE:
- break;
- default:
- goto error;
- }
- p_buf--; /* rewind to the version byte */
- p_buf += i_read;
- if( i_read + 2 > i_sig_len )
- goto error;
- size_t i_r_len = mpi_len( p_buf ); i_read += 2;
- if( i_read + i_r_len > i_sig_len || i_r_len > 20 )
- goto error;
- memcpy( p_sig->r, p_buf, 2 + i_r_len );
- p_buf += 2 + i_r_len;
- i_read += i_r_len;
- if( i_read + 2 > i_sig_len )
- goto error;
- size_t i_s_len = mpi_len( p_buf ); i_read += 2;
- if( i_read + i_s_len > i_sig_len || i_s_len > 20 )
- goto error;
- memcpy( p_sig->s, p_buf, 2 + i_s_len );
- p_buf += 2 + i_s_len;
- i_read += i_s_len;
- assert( i_read == i_sig_len );
- if( i_read < i_sig_len ) /* some extra data, hm ? */
- goto error;
- return VLC_SUCCESS;
- error:
- if( p_sig->version == 4 )
- {
- free( p_sig->specific.v4.hashed_data );
- free( p_sig->specific.v4.unhashed_data );
- }
- return VLC_EGENERIC;
- }
- /*
- * crc_octets() was lamely copied from rfc 2440
- * Copyright (C) The Internet Society (1998). All Rights Reserved.
- */
- #define CRC24_INIT 0xB704CEL
- #define CRC24_POLY 0x1864CFBL
- static long crc_octets( uint8_t *octets, size_t len )
- {
- long crc = CRC24_INIT;
- int i;
- while (len--)
- {
- crc ^= (*octets++) << 16;
- for (i = 0; i < 8; i++)
- {
- crc <<= 1;
- if (crc & 0x1000000)
- crc ^= CRC24_POLY;
- }
- }
- return crc & 0xFFFFFFL;
- }
- /*
- * Transform an armored document in binary format
- * Used on public keys and signatures
- */
- static int pgp_unarmor( char *p_ibuf, size_t i_ibuf_len,
- uint8_t *p_obuf, size_t i_obuf_len )
- {
- char *p_ipos = p_ibuf;
- uint8_t *p_opos = p_obuf;
- int i_end = 0;
- int i_header_skipped = 0;
- while( !i_end && p_ipos < p_ibuf + i_ibuf_len && *p_ipos != '=' )
- {
- if( *p_ipos == 'r' || *p_ipos == 'n' )
- {
- p_ipos++;
- continue;
- }
- size_t i_line_len = strcspn( p_ipos, "rn" );
- if( i_line_len == 0 )
- continue;
- if( !i_header_skipped )
- {
- if( !strncmp( p_ipos, "-----BEGIN PGP", 14 ) )
- i_header_skipped = 1;
- p_ipos += i_line_len + 1;
- continue;
- }
- if( !strncmp( p_ipos, "Version:", 8 ) )
- {
- p_ipos += i_line_len + 1;
- continue;
- }
- if( p_ipos[i_line_len - 1] == '=' )
- {
- i_end = 1;
- p_ipos[i_line_len - 1] = ' ';
- }
- else
- p_ipos[i_line_len] = ' ';
- p_opos += vlc_b64_decode_binary_to_buffer( p_opos,
- p_obuf - p_opos + i_obuf_len, p_ipos );
- p_ipos += i_line_len + 1;
- }
- /* XXX: the CRC is OPTIONAL, really require it ? */
- if( p_ipos + 5 > p_ibuf + i_ibuf_len || *p_ipos++ != '=' )
- return 0;
- uint8_t p_crc[3];
- if( vlc_b64_decode_binary_to_buffer( p_crc, 3, p_ipos ) != 3 )
- return 0;
- long l_crc = crc_octets( p_obuf, p_opos - p_obuf );
- long l_crc2 = ( 0 << 24 ) + ( p_crc[0] << 16 ) + ( p_crc[1] << 8 ) + p_crc[2];
- return l_crc2 == l_crc ? p_opos - p_obuf : 0;
- }
- /*
- * Download the signature associated to a document or a binary file.
- * We're given the file's url, we just append ".asc" to it and download
- */
- static int download_signature( vlc_object_t *p_this,
- signature_packet_t *p_sig,
- const char *psz_url )
- {
- char *psz_sig = (char*) malloc( strlen( psz_url ) + 4 + 1 ); /* ".asc" +