source: MondoRescue/branches/stable/mindi-busybox/archival/rpm2cpio.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 3.0 KB
Line 
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
32struct 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
43struct 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
51static 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 */
69int 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}
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