| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini rpm2cpio implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2001 by Laurence Anderson
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | */
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| 9 | #include "libbb.h"
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| 10 | #include "archive.h"
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| 11 | #include "rpm.h"
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| 12 |
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| 13 | enum { rpm_fd = STDIN_FILENO };
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| 14 |
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| 15 | static unsigned skip_header(void)
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| 16 | {
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| 17 | struct rpm_header header;
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| 18 | unsigned len;
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| 19 |
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| 20 | xread(rpm_fd, &header, sizeof(header));
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| 21 | // if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
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| 22 | // bb_error_msg_and_die("invalid RPM header magic");
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| 23 | // }
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| 24 | // if (header.version != 1) {
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| 25 | // bb_error_msg_and_die("unsupported RPM header version");
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| 26 | // }
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| 27 | if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
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| 28 | bb_error_msg_and_die("invalid RPM header magic or unsupported version");
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| 29 | // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
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| 30 | }
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| 31 |
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| 32 | /* Seek past index entries, and past store */
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| 33 | len = 16 * ntohl(header.entries) + ntohl(header.size);
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| 34 | seek_by_jump(rpm_fd, len);
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| 35 |
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| 36 | return sizeof(header) + len;
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| 37 | }
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| 38 |
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| 39 | /* No getopt required */
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| 40 | int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 41 | int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
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| 42 | {
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| 43 | struct rpm_lead lead;
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| 44 | unsigned pos;
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| 45 |
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| 46 | if (argv[1]) {
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| 47 | xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
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| 48 | }
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| 49 | xread(rpm_fd, &lead, sizeof(lead));
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| 50 |
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| 51 | /* Just check the magic, the rest is irrelevant */
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| 52 | if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
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| 53 | bb_error_msg_and_die("invalid RPM magic");
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| 54 | }
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| 55 |
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| 56 | /* Skip the signature header, align to 8 bytes */
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| 57 | pos = skip_header();
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| 58 | seek_by_jump(rpm_fd, (-(int)pos) & 7);
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| 59 |
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| 60 | /* Skip the main header */
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| 61 | skip_header();
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| 62 |
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| 63 | #if 0
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| 64 | /* This works, but doesn't report uncompress errors (they happen in child) */
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| 65 | setup_unzip_on_fd(rpm_fd /*fail_if_not_detected: 1*/);
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| 66 | if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
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| 67 | bb_error_msg_and_die("error unpacking");
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| 68 | #else
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| 69 | /* BLOAT */
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| 70 | {
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| 71 | union {
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| 72 | uint8_t b[4];
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| 73 | uint16_t b16[2];
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| 74 | uint32_t b32[1];
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| 75 | } magic;
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| 76 | IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
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| 77 |
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| 78 | xread(rpm_fd, magic.b16, sizeof(magic.b16[0]));
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| 79 | if (magic.b16[0] == GZIP_MAGIC) {
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| 80 | unpack = unpack_gz_stream;
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| 81 | } else
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| 82 | if (ENABLE_FEATURE_SEAMLESS_BZ2
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| 83 | && magic.b16[0] == BZIP2_MAGIC
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| 84 | ) {
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| 85 | unpack = unpack_bz2_stream;
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| 86 | } else
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| 87 | if (ENABLE_FEATURE_SEAMLESS_XZ
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| 88 | && magic.b16[0] == XZ_MAGIC1
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| 89 | ) {
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| 90 | xread(rpm_fd, magic.b32, sizeof(magic.b32[0]));
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| 91 | if (magic.b32[0] != XZ_MAGIC2)
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| 92 | goto no_magic;
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| 93 | /* unpack_xz_stream wants fd at position 6, no need to seek */
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| 94 | //xlseek(rpm_fd, -6, SEEK_CUR);
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| 95 | unpack = unpack_xz_stream;
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| 96 | } else {
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| 97 | no_magic:
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| 98 | bb_error_msg_and_die("no gzip"
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| 99 | IF_FEATURE_SEAMLESS_BZ2("/bzip2")
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| 100 | IF_FEATURE_SEAMLESS_XZ("/xz")
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| 101 | " magic");
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| 102 | }
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| 103 | if (unpack(rpm_fd, STDOUT_FILENO) < 0)
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| 104 | bb_error_msg_and_die("error unpacking");
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| 105 | }
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| 106 | #endif
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| 107 |
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| 108 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 109 | close(rpm_fd);
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| 110 | }
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| 111 |
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| 112 | return 0;
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| 113 | }
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