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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