mirror of
https://github.com/sheumann/hush.git
synced 2024-12-27 01:32:08 +00:00
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/* 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.
|
|
*/
|
|
#include "busybox.h"
|
|
#include "unarchive.h"
|
|
|
|
#define RPM_MAGIC "\355\253\356\333"
|
|
#define RPM_HEADER_MAGIC "\216\255\350"
|
|
|
|
struct rpm_lead {
|
|
unsigned char magic[4];
|
|
uint8_t major, minor;
|
|
uint16_t type;
|
|
uint16_t archnum;
|
|
char name[66];
|
|
uint16_t osnum;
|
|
uint16_t signature_type;
|
|
char reserved[16];
|
|
};
|
|
|
|
struct rpm_header {
|
|
char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */
|
|
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) */
|
|
};
|
|
|
|
static void skip_header(int rpm_fd)
|
|
{
|
|
struct rpm_header header;
|
|
|
|
xread(rpm_fd, &header, sizeof(struct rpm_header));
|
|
if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0) {
|
|
bb_error_msg_and_die("Invalid RPM header magic"); /* Invalid magic */
|
|
}
|
|
if (header.version != 1) {
|
|
bb_error_msg_and_die("Unsupported RPM header version"); /* This program only supports v1 headers */
|
|
}
|
|
header.entries = ntohl(header.entries);
|
|
header.size = ntohl(header.size);
|
|
lseek (rpm_fd, 16 * header.entries, SEEK_CUR); /* Seek past index entries */
|
|
lseek (rpm_fd, header.size, SEEK_CUR); /* Seek past store */
|
|
}
|
|
|
|
/* No getopt required */
|
|
int rpm2cpio_main(int argc, char **argv)
|
|
{
|
|
struct rpm_lead lead;
|
|
int rpm_fd;
|
|
unsigned char magic[2];
|
|
|
|
if (argc == 1) {
|
|
rpm_fd = STDIN_FILENO;
|
|
} else {
|
|
rpm_fd = xopen(argv[1], O_RDONLY);
|
|
}
|
|
|
|
xread(rpm_fd, &lead, sizeof(struct rpm_lead));
|
|
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 */
|
|
}
|
|
|
|
/* Skip the signature header */
|
|
skip_header(rpm_fd);
|
|
lseek(rpm_fd, (8 - (lseek(rpm_fd, 0, SEEK_CUR) % 8)) % 8, SEEK_CUR);
|
|
|
|
/* Skip the main header */
|
|
skip_header(rpm_fd);
|
|
|
|
xread(rpm_fd, &magic, 2);
|
|
if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
|
|
bb_error_msg_and_die("invalid gzip magic");
|
|
}
|
|
|
|
check_header_gzip(rpm_fd);
|
|
if (inflate_gunzip(rpm_fd, STDOUT_FILENO) < 0) {
|
|
bb_error_msg("error inflating");
|
|
}
|
|
|
|
close(rpm_fd);
|
|
|
|
return 0;
|
|
}
|