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 |
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10 | //config:config RPM2CPIO
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11 | //config: bool "rpm2cpio"
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12 | //config: default y
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13 | //config: help
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14 | //config: Converts a RPM file into a CPIO archive.
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15 |
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16 | //applet:IF_RPM2CPIO(APPLET(rpm2cpio, BB_DIR_USR_BIN, BB_SUID_DROP))
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17 | //kbuild:lib-$(CONFIG_RPM2CPIO) += rpm2cpio.o
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18 |
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19 | //usage:#define rpm2cpio_trivial_usage
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20 | //usage: "package.rpm"
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21 | //usage:#define rpm2cpio_full_usage "\n\n"
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22 | //usage: "Output a cpio archive of the rpm file"
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23 |
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24 | #include "libbb.h"
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25 | #include "bb_archive.h"
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26 | #include "rpm.h"
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27 |
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28 | enum { rpm_fd = STDIN_FILENO };
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29 |
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30 | static unsigned skip_header(void)
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31 | {
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32 | struct rpm_header header;
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33 | unsigned len;
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34 |
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35 | xread(rpm_fd, &header, sizeof(header));
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36 | // if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
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37 | // bb_error_msg_and_die("invalid RPM header magic");
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38 | // }
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39 | // if (header.version != 1) {
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40 | // bb_error_msg_and_die("unsupported RPM header version");
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41 | // }
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42 | if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
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43 | bb_error_msg_and_die("invalid RPM header magic or unsupported version");
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44 | // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
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45 | }
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46 |
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47 | /* Seek past index entries, and past store */
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48 | len = 16 * ntohl(header.entries) + ntohl(header.size);
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49 | seek_by_jump(rpm_fd, len);
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50 |
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51 | return sizeof(header) + len;
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52 | }
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53 |
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54 | /* No getopt required */
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55 | int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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56 | int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
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57 | {
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58 | struct rpm_lead lead;
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59 | unsigned pos;
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60 |
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61 | if (argv[1]) {
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62 | xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
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63 | }
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64 | xread(rpm_fd, &lead, sizeof(lead));
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65 |
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66 | /* Just check the magic, the rest is irrelevant */
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67 | if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
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68 | bb_error_msg_and_die("invalid RPM magic");
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69 | }
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70 |
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71 | /* Skip the signature header, align to 8 bytes */
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72 | pos = skip_header();
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73 | seek_by_jump(rpm_fd, (-(int)pos) & 7);
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74 |
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75 | /* Skip the main header */
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76 | skip_header();
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77 |
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78 | //if (SEAMLESS_COMPRESSION)
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79 | // /* We need to know whether child (gzip/bzip/etc) exits abnormally */
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80 | // signal(SIGCHLD, check_errors_in_children);
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81 |
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82 | /* This works, but doesn't report uncompress errors (they happen in child) */
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83 | setup_unzip_on_fd(rpm_fd, /*fail_if_not_compressed:*/ 1);
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84 | if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
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85 | bb_error_msg_and_die("error unpacking");
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86 |
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87 | if (ENABLE_FEATURE_CLEAN_UP) {
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88 | close(rpm_fd);
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89 | }
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90 |
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91 | if (SEAMLESS_COMPRESSION) {
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92 | check_errors_in_children(0);
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93 | return bb_got_signal;
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94 | }
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95 | return EXIT_SUCCESS;
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96 | }
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