| 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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