1 /* vi: set sw=4 ts=4: */
2 /*
3 * Mini rpm2cpio implementation for busybox
4 *
5 * Copyright (C) 2001 by Laurence Anderson
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
9
10 //config:config RPM2CPIO
11 //config: bool "rpm2cpio"
12 //config: default y
13 //config: help
14 //config: Converts a RPM file into a CPIO archive.
15
16 //applet:IF_RPM2CPIO(APPLET(rpm2cpio, BB_DIR_USR_BIN, BB_SUID_DROP))
17 //kbuild:lib-$(CONFIG_RPM2CPIO) += rpm2cpio.o
18
19 //usage:#define rpm2cpio_trivial_usage
20 //usage: "package.rpm"
21 //usage:#define rpm2cpio_full_usage "\n\n"
22 //usage: "Output a cpio archive of the rpm file"
23
24 #include "libbb.h"
25 #include "bb_archive.h"
26 #include "rpm.h"
27
28 enum { rpm_fd = STDIN_FILENO };
29
skip_header(void)30 static unsigned skip_header(void)
31 {
32 struct rpm_header header;
33 unsigned len;
34
35 xread(rpm_fd, &header, sizeof(header));
36 // if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
37 // bb_error_msg_and_die("invalid RPM header magic");
38 // }
39 // if (header.version != 1) {
40 // bb_error_msg_and_die("unsupported RPM header version");
41 // }
42 if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
43 bb_error_msg_and_die("invalid RPM header magic or unsupported version");
44 // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
45 }
46
47 /* Seek past index entries, and past store */
48 len = 16 * ntohl(header.entries) + ntohl(header.size);
49 seek_by_jump(rpm_fd, len);
50
51 return sizeof(header) + len;
52 }
53
54 /* No getopt required */
55 int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
rpm2cpio_main(int argc UNUSED_PARAM,char ** argv)56 int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
57 {
58 struct rpm_lead lead;
59 unsigned pos;
60
61 if (argv[1]) {
62 xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
63 }
64 xread(rpm_fd, &lead, sizeof(lead));
65
66 /* Just check the magic, the rest is irrelevant */
67 if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
68 bb_error_msg_and_die("invalid RPM magic");
69 }
70
71 /* Skip the signature header, align to 8 bytes */
72 pos = skip_header();
73 seek_by_jump(rpm_fd, (-(int)pos) & 7);
74
75 /* Skip the main header */
76 skip_header();
77
78 //if (SEAMLESS_COMPRESSION)
79 // /* We need to know whether child (gzip/bzip/etc) exits abnormally */
80 // signal(SIGCHLD, check_errors_in_children);
81
82 /* This works, but doesn't report uncompress errors (they happen in child) */
83 setup_unzip_on_fd(rpm_fd, /*fail_if_not_compressed:*/ 1);
84 if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
85 bb_error_msg_and_die("error unpacking");
86
87 if (ENABLE_FEATURE_CLEAN_UP) {
88 close(rpm_fd);
89 }
90
91 if (SEAMLESS_COMPRESSION) {
92 check_errors_in_children(0);
93 return bb_got_signal;
94 }
95 return EXIT_SUCCESS;
96 }
97