archival/rpm2cpio.c

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