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/* $NetBSD: parse-rpm.c,v 1.1 2011/01/12 00:26:33 tron Exp $ */
/*-
* Copyright (c) 2001-2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matthias Scheler.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "parse-rpm.h"
#include <sys/types.h>
#include <arpa/inet.h>
#include <inttypes.h>
#include <string.h>
/*
* The following definitions are based on the documentation of the
* RPM format which can be found here:
*
* http://www.rpm.org/max-rpm/s1-rpm-file-format-rpm-file-format.html
*/
/* Lead of an RPM archive. */
typedef struct RPMLead_s {
uint8_t magic[4];
uint8_t major, minor;
int16_t type;
int16_t archnum;
int8_t name[66];
int16_t osnum;
uint16_t signature_type;
int8_t reserved[16];
} RPMLead;
static const uint8_t RPMLeadMagic[] = { 0xed, 0xab, 0xee, 0xdb };
/* Header section of an RPM archive. */
typedef struct RPMHeader_s {
uint8_t magic[3];
uint8_t version;
uint8_t reserved[4];
uint32_t indexSize;
uint32_t dataSize;
} RPMHeader;
static const uint8_t RPMHeaderMagic[] = { 0x8e, 0xad, 0xe8 };
/* Magic bytes for "bzip2" and "gzip" compressed files. */
static const unsigned char BZipMagic[] = { 'B', 'Z', 'h' };
static const unsigned char GZipMagic[] = { 0x1f, 0x8b, 0x08 };
/* Magic bytes for a cpio(1) archive. */
static const unsigned char CPIOMagic[] = {'0','7','0','7','0','1'};
/* Check whether we got an RPM file and find the data section. */
bool
IsRPMFile(int fd)
{
RPMLead rpmLead;
bool padding;
RPMHeader rpmHeader;
/* Check for RPM lead. */
if (read(fd, &rpmLead, sizeof(RPMLead)) != sizeof(RPMLead))
return false;
if (memcmp(rpmLead.magic, RPMLeadMagic, sizeof(RPMLeadMagic)) != 0)
return false;
/* We don't support very old RPMs. */
if (rpmLead.major < 3)
return false;
/*
* The RPM file format has a horrible requirement for extra padding
* depending on what type of signature is used.
*/
padding = htons(rpmLead.signature_type) == 5;
/* Skip over RPM header(s). */
while (read(fd, &rpmHeader, sizeof(RPMHeader)) == sizeof(RPMHeader)) {
uint32_t indexSize, dataSize;
off_t offset;
/* Did we find another header? */
if (memcmp(rpmHeader.magic, RPMHeaderMagic,
sizeof(RPMHeaderMagic)) != 0) {
/* Nope, seek backwards and return. */
return (lseek(fd, -(off_t)sizeof(RPMHeader),
SEEK_CUR) != -1);
}
/* Find out how large the header is ... */
indexSize = htonl(rpmHeader.indexSize);
dataSize = htonl(rpmHeader.dataSize);
/* .. and skip over it. */
offset = indexSize * 4 * sizeof(uint32_t) + dataSize;
if (padding) {
offset = ((offset + 7) / 8) * 8;
padding = false;
}
if (lseek(fd, offset, SEEK_CUR) == -1)
return false;
}
return false;
}
FileHandle *
OpenRPM(int *fd_p)
{
unsigned char buffer[8];
FileHandle *fh;
/*
* Read enough bytes to identify the compression and seek back to
* the beginning of the data section.
*/
if (read(*fd_p, buffer, sizeof(buffer)) != sizeof(buffer) ||
lseek(*fd_p, -(off_t)sizeof(buffer), SEEK_CUR) == -1) {
return NULL;
}
/* Determine the compression method. */
if (memcmp(buffer, CPIOMagic, sizeof(CPIOMagic)) == 0) {
/* uncompressed data */
fh = FileHandlePlain(fd_p);
} else if (memcmp(buffer, BZipMagic, sizeof(BZipMagic)) == 0) {
/* bzip2 archive */
fh = FileHandleBZLib(fd_p);
} else if (memcmp(buffer, GZipMagic, sizeof(GZipMagic)) == 0) {
/* gzip archive */
fh = FileHandleZLib(fd_p);
} else {
/* lzma ... hopefully */
fh = FileHandleLZMA(fd_p);
}
return fh;
}
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