hush/archival/rpm2cpio.c

91 lines
2.3 KiB
C
Raw Normal View History

2001-06-26 01:19:34 +00:00
/* vi: set sw=4 ts=4: */
/*
* Mini rpm2cpio implementation for busybox
*
* Copyright (C) 2001 by Laurence Anderson
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
2001-06-26 01:19:34 +00:00
*/
#include "libbb.h"
2002-09-25 02:47:48 +00:00
#include "unarchive.h"
2001-06-26 01:19:34 +00:00
#define RPM_MAGIC "\355\253\356\333"
#define RPM_HEADER_MAGIC "\216\255\350"
struct rpm_lead {
unsigned char magic[4];
2004-01-30 22:54:20 +00:00
uint8_t major, minor;
uint16_t type;
uint16_t archnum;
2001-06-26 01:19:34 +00:00
char name[66];
2004-01-30 22:54:20 +00:00
uint16_t osnum;
uint16_t signature_type;
2001-06-26 01:19:34 +00:00
char reserved[16];
};
struct rpm_header {
char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */
2004-01-30 22:54:20 +00:00
uint8_t version; /* 1 byte version number */
uint32_t reserved; /* 4 bytes reserved */
uint32_t entries; /* Number of entries in header (4 bytes) */
uint32_t size; /* Size of store (4 bytes) */
2001-06-26 01:19:34 +00:00
};
static void skip_header(int rpm_fd)
2001-06-26 01:19:34 +00:00
{
struct rpm_header header;
xread(rpm_fd, &header, sizeof(struct rpm_header));
2002-09-25 02:47:48 +00:00
if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0) {
bb_error_msg_and_die("invalid RPM header magic"); /* Invalid magic */
2002-09-25 02:47:48 +00:00
}
if (header.version != 1) {
bb_error_msg_and_die("unsupported RPM header version"); /* This program only supports v1 headers */
2002-09-25 02:47:48 +00:00
}
2001-06-26 01:19:34 +00:00
header.entries = ntohl(header.entries);
header.size = ntohl(header.size);
2002-09-25 02:47:48 +00:00
lseek (rpm_fd, 16 * header.entries, SEEK_CUR); /* Seek past index entries */
lseek (rpm_fd, header.size, SEEK_CUR); /* Seek past store */
2001-06-26 01:19:34 +00:00
}
/* No getopt required */
int rpm2cpio_main(int argc, char **argv);
int rpm2cpio_main(int argc, char **argv)
2001-06-26 01:19:34 +00:00
{
struct rpm_lead lead;
2002-09-25 02:47:48 +00:00
int rpm_fd;
unsigned char magic[2];
2001-06-26 01:19:34 +00:00
if (argc == 1) {
rpm_fd = STDIN_FILENO;
2001-06-26 01:19:34 +00:00
} else {
rpm_fd = xopen(argv[1], O_RDONLY);
2002-09-25 02:47:48 +00:00
}
xread(rpm_fd, &lead, sizeof(struct rpm_lead));
2002-09-25 02:47:48 +00:00
if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) {
bb_error_msg_and_die("invalid RPM magic"); /* Just check the magic, the rest is irrelevant */
2001-06-26 01:19:34 +00:00
}
/* Skip the signature header */
2002-09-25 02:47:48 +00:00
skip_header(rpm_fd);
lseek(rpm_fd, (8 - (lseek(rpm_fd, 0, SEEK_CUR) % 8)) % 8, SEEK_CUR);
2002-09-25 02:47:48 +00:00
2001-06-26 01:19:34 +00:00
/* Skip the main header */
2002-09-25 02:47:48 +00:00
skip_header(rpm_fd);
xread(rpm_fd, &magic, 2);
2002-10-18 22:31:02 +00:00
if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
bb_error_msg_and_die("invalid gzip magic");
}
2002-09-25 02:47:48 +00:00
check_header_gzip_or_die(rpm_fd);
if (unpack_gz_stream(rpm_fd, STDOUT_FILENO) < 0) {
bb_error_msg("error inflating");
2002-09-25 02:47:48 +00:00
}
2001-06-26 01:19:34 +00:00
2002-09-25 02:47:48 +00:00
close(rpm_fd);
2001-06-26 01:19:34 +00:00
return 0;
}