[821] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * Mini rpm2cpio implementation for busybox
|
---|
| 4 | *
|
---|
| 5 | * Copyright (C) 2001 by Laurence Anderson
|
---|
| 6 | *
|
---|
| 7 | * This program is free software; you can redistribute it and/or modify
|
---|
| 8 | * it under the terms of the GNU General Public License as published by
|
---|
| 9 | * the Free Software Foundation; either version 2 of the License, or
|
---|
| 10 | * (at your option) any later version.
|
---|
| 11 | *
|
---|
| 12 | * This program is distributed in the hope that it will be useful,
|
---|
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
---|
| 15 | * General Public License for more details.
|
---|
| 16 | *
|
---|
| 17 | * You should have received a copy of the GNU General Public License
|
---|
| 18 | * along with this program; if not, write to the Free Software
|
---|
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
---|
| 20 | */
|
---|
| 21 | #include <sys/types.h>
|
---|
| 22 | #include <netinet/in.h> /* For ntohl & htonl function */
|
---|
| 23 | #include <fcntl.h>
|
---|
| 24 | #include <unistd.h>
|
---|
| 25 | #include <string.h>
|
---|
| 26 | #include "busybox.h"
|
---|
| 27 | #include "unarchive.h"
|
---|
| 28 |
|
---|
| 29 | #define RPM_MAGIC "\355\253\356\333"
|
---|
| 30 | #define RPM_HEADER_MAGIC "\216\255\350"
|
---|
| 31 |
|
---|
| 32 | struct rpm_lead {
|
---|
| 33 | unsigned char magic[4];
|
---|
| 34 | uint8_t major, minor;
|
---|
| 35 | uint16_t type;
|
---|
| 36 | uint16_t archnum;
|
---|
| 37 | char name[66];
|
---|
| 38 | uint16_t osnum;
|
---|
| 39 | uint16_t signature_type;
|
---|
| 40 | char reserved[16];
|
---|
| 41 | };
|
---|
| 42 |
|
---|
| 43 | struct rpm_header {
|
---|
| 44 | char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */
|
---|
| 45 | uint8_t version; /* 1 byte version number */
|
---|
| 46 | uint32_t reserved; /* 4 bytes reserved */
|
---|
| 47 | uint32_t entries; /* Number of entries in header (4 bytes) */
|
---|
| 48 | uint32_t size; /* Size of store (4 bytes) */
|
---|
| 49 | };
|
---|
| 50 |
|
---|
| 51 | static void skip_header(int rpm_fd)
|
---|
| 52 | {
|
---|
| 53 | struct rpm_header header;
|
---|
| 54 |
|
---|
| 55 | bb_xread_all(rpm_fd, &header, sizeof(struct rpm_header));
|
---|
| 56 | if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0) {
|
---|
| 57 | bb_error_msg_and_die("Invalid RPM header magic"); /* Invalid magic */
|
---|
| 58 | }
|
---|
| 59 | if (header.version != 1) {
|
---|
| 60 | bb_error_msg_and_die("Unsupported RPM header version"); /* This program only supports v1 headers */
|
---|
| 61 | }
|
---|
| 62 | header.entries = ntohl(header.entries);
|
---|
| 63 | header.size = ntohl(header.size);
|
---|
| 64 | lseek (rpm_fd, 16 * header.entries, SEEK_CUR); /* Seek past index entries */
|
---|
| 65 | lseek (rpm_fd, header.size, SEEK_CUR); /* Seek past store */
|
---|
| 66 | }
|
---|
| 67 |
|
---|
| 68 | /* No getopt required */
|
---|
| 69 | int rpm2cpio_main(int argc, char **argv)
|
---|
| 70 | {
|
---|
| 71 | struct rpm_lead lead;
|
---|
| 72 | int rpm_fd;
|
---|
| 73 | unsigned char magic[2];
|
---|
| 74 |
|
---|
| 75 | if (argc == 1) {
|
---|
| 76 | rpm_fd = STDIN_FILENO;
|
---|
| 77 | } else {
|
---|
| 78 | rpm_fd = bb_xopen(argv[1], O_RDONLY);
|
---|
| 79 | }
|
---|
| 80 |
|
---|
| 81 | bb_xread_all(rpm_fd, &lead, sizeof(struct rpm_lead));
|
---|
| 82 | if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) {
|
---|
| 83 | bb_error_msg_and_die("Invalid RPM magic"); /* Just check the magic, the rest is irrelevant */
|
---|
| 84 | }
|
---|
| 85 |
|
---|
| 86 | /* Skip the signature header */
|
---|
| 87 | skip_header(rpm_fd);
|
---|
| 88 | lseek(rpm_fd, (8 - (lseek(rpm_fd, 0, SEEK_CUR) % 8)) % 8, SEEK_CUR);
|
---|
| 89 |
|
---|
| 90 | /* Skip the main header */
|
---|
| 91 | skip_header(rpm_fd);
|
---|
| 92 |
|
---|
| 93 | bb_xread_all(rpm_fd, &magic, 2);
|
---|
| 94 | if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
|
---|
| 95 | bb_error_msg_and_die("Invalid gzip magic");
|
---|
| 96 | }
|
---|
| 97 |
|
---|
| 98 | check_header_gzip(rpm_fd);
|
---|
| 99 | if (inflate_gunzip(rpm_fd, STDOUT_FILENO) != 0) {
|
---|
| 100 | bb_error_msg("Error inflating");
|
---|
| 101 | }
|
---|
| 102 |
|
---|
| 103 | close(rpm_fd);
|
---|
| 104 |
|
---|
| 105 | return 0;
|
---|
| 106 | }
|
---|