LXR busybox/archival/rpm2cpio.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Mini rpm2cpio implementation for busybox
   4 *
   5 * Copyright (C) 2001 by Laurence Anderson
   6 *
   7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   8 */
   9#include "libbb.h"
  10#include "unarchive.h"
  11
  12#define RPM_MAGIC            0xedabeedb
  13#define RPM_MAGIC_STR        "\355\253\356\333"
  14
  15struct rpm_lead {
  16        uint32_t magic;
  17        uint8_t major, minor;
  18        uint16_t type;
  19        uint16_t archnum;
  20        char name[66];
  21        uint16_t osnum;
  22        uint16_t signature_type;
  23        char reserved[16];
  24};
  25
  26#define RPM_HEADER_MAGICnVER 0x8eade801
  27#define RPM_HEADER_MAGIC_STR "\216\255\350"
  28
  29struct rpm_header {
  30        uint32_t magic_and_ver; /* 3 byte magic: 0x8e 0xad 0xe8; 1 byte version */
  31        uint32_t reserved; /* 4 bytes reserved */
  32        uint32_t entries; /* Number of entries in header (4 bytes) */
  33        uint32_t size; /* Size of store (4 bytes) */
  34};
  35
  36enum { rpm_fd = STDIN_FILENO };
  37
  38static unsigned skip_header(void)
  39{
  40        struct rpm_header header;
  41        unsigned len;
  42
  43        xread(rpm_fd, &header, sizeof(header));
  44//      if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
  45//              bb_error_msg_and_die("invalid RPM header magic");
  46//      }
  47//      if (header.version != 1) {
  48//              bb_error_msg_and_die("unsupported RPM header version");
  49//      }
  50        if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
  51                bb_error_msg_and_die("invalid RPM header magic or unsupported version");
  52                // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
  53        }
  54
  55        /* Seek past index entries, and past store */
  56        len = 16 * ntohl(header.entries) + ntohl(header.size);
  57        seek_by_jump(rpm_fd, len);
  58
  59        return sizeof(header) + len;
  60}
  61
  62/* No getopt required */
  63int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  64int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
  65{
  66        struct rpm_lead lead;
  67        unsigned pos;
  68        unsigned char magic[2];
  69        IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
  70
  71        if (argv[1]) {
  72                xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
  73        }
  74        xread(rpm_fd, &lead, sizeof(lead));
  75
  76        /* Just check the magic, the rest is irrelevant */
  77        if (lead.magic != htonl(RPM_MAGIC)) {
  78                bb_error_msg_and_die("invalid RPM magic");
  79        }
  80
  81        /* Skip the signature header, align to 8 bytes */
  82        pos = skip_header();
  83        seek_by_jump(rpm_fd, (8 - pos) & 7);
  84
  85        /* Skip the main header */
  86        skip_header();
  87
  88        xread(rpm_fd, &magic, 2);
  89        unpack = unpack_gz_stream;
  90        if (magic[0] != 0x1f || magic[1] != 0x8b) {
  91                if (!ENABLE_FEATURE_SEAMLESS_BZ2
  92                 || magic[0] != 'B' || magic[1] != 'Z'
  93                ) {
  94                        bb_error_msg_and_die("invalid gzip"
  95                                        IF_FEATURE_SEAMLESS_BZ2("/bzip2")
  96                                        " magic");
  97                }
  98                unpack = unpack_bz2_stream;
  99        }
 100
 101        if (unpack(rpm_fd, STDOUT_FILENO) < 0) {
 102                bb_error_msg_and_die("error unpacking");
 103        }
 104
 105        if (ENABLE_FEATURE_CLEAN_UP) {
 106                close(rpm_fd);
 107        }
 108
 109        return 0;
 110}
 111