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 tarball for details.
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8 | */
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9 | #include "libbb.h"
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10 | #include "unarchive.h"
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11 |
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12 | #define RPM_MAGIC "\355\253\356\333"
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13 | #define RPM_HEADER_MAGIC "\216\255\350"
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14 |
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15 | struct rpm_lead {
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16 | unsigned char magic[4];
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17 | uint8_t major, minor;
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18 | uint16_t type;
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19 | uint16_t archnum;
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20 | char name[66];
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21 | uint16_t osnum;
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22 | uint16_t signature_type;
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23 | char reserved[16];
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24 | };
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25 |
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26 | struct rpm_header {
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27 | char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */
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28 | uint8_t version; /* 1 byte version number */
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29 | uint32_t reserved; /* 4 bytes reserved */
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30 | uint32_t entries; /* Number of entries in header (4 bytes) */
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31 | uint32_t size; /* Size of store (4 bytes) */
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32 | };
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33 |
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34 | static void skip_header(int rpm_fd)
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35 | {
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36 | struct rpm_header header;
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37 |
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38 | xread(rpm_fd, &header, sizeof(struct rpm_header));
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39 | if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0) {
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40 | bb_error_msg_and_die("invalid RPM header magic"); /* Invalid magic */
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41 | }
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42 | if (header.version != 1) {
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43 | bb_error_msg_and_die("unsupported RPM header version"); /* This program only supports v1 headers */
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44 | }
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45 | header.entries = ntohl(header.entries);
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46 | header.size = ntohl(header.size);
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47 | lseek (rpm_fd, 16 * header.entries, SEEK_CUR); /* Seek past index entries */
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48 | lseek (rpm_fd, header.size, SEEK_CUR); /* Seek past store */
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49 | }
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50 |
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51 | /* No getopt required */
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52 | int rpm2cpio_main(int argc, char **argv);
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53 | int rpm2cpio_main(int argc, char **argv)
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54 | {
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55 | struct rpm_lead lead;
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56 | int rpm_fd;
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57 | unsigned char magic[2];
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58 |
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59 | if (argc == 1) {
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60 | rpm_fd = STDIN_FILENO;
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61 | } else {
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62 | rpm_fd = xopen(argv[1], O_RDONLY);
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63 | }
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64 |
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65 | xread(rpm_fd, &lead, sizeof(struct rpm_lead));
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66 | if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) {
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67 | bb_error_msg_and_die("invalid RPM magic"); /* Just check the magic, the rest is irrelevant */
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68 | }
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69 |
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70 | /* Skip the signature header */
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71 | skip_header(rpm_fd);
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72 | lseek(rpm_fd, (8 - (lseek(rpm_fd, 0, SEEK_CUR) % 8)) % 8, SEEK_CUR);
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73 |
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74 | /* Skip the main header */
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75 | skip_header(rpm_fd);
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76 |
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77 | xread(rpm_fd, &magic, 2);
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78 | if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
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79 | bb_error_msg_and_die("invalid gzip magic");
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80 | }
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81 |
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82 | check_header_gzip_or_die(rpm_fd);
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83 | if (unpack_gz_stream(rpm_fd, STDOUT_FILENO) < 0) {
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84 | bb_error_msg("error inflating");
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85 | }
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86 |
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87 | close(rpm_fd);
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88 |
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89 | return 0;
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90 | }
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