/* vi: set sw=4 ts=4: */ /* * Mini rpm2cpio implementation for busybox * * Copyright (C) 2001 by Laurence Anderson * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <sys/types.h> #include <netinet/in.h> /* For ntohl & htonl function */ #include <fcntl.h> #include <unistd.h> #include <string.h> #include "busybox.h" #include "unarchive.h" #define RPM_MAGIC "\355\253\356\333" #define RPM_HEADER_MAGIC "\216\255\350" struct rpm_lead { unsigned char magic[4]; uint8_t major, minor; uint16_t type; uint16_t archnum; char name[66]; uint16_t osnum; uint16_t signature_type; char reserved[16]; }; struct rpm_header { char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */ uint8_t version; /* 1 byte version number */ uint32_t reserved; /* 4 bytes reserved */ uint32_t entries; /* Number of entries in header (4 bytes) */ uint32_t size; /* Size of store (4 bytes) */ }; static void skip_header(int rpm_fd) { struct rpm_header header; bb_xread_all(rpm_fd, &header, sizeof(struct rpm_header)); if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0) { bb_error_msg_and_die("Invalid RPM header magic"); /* Invalid magic */ } if (header.version != 1) { bb_error_msg_and_die("Unsupported RPM header version"); /* This program only supports v1 headers */ } header.entries = ntohl(header.entries); header.size = ntohl(header.size); lseek (rpm_fd, 16 * header.entries, SEEK_CUR); /* Seek past index entries */ lseek (rpm_fd, header.size, SEEK_CUR); /* Seek past store */ } /* No getopt required */ extern int rpm2cpio_main(int argc, char **argv) { struct rpm_lead lead; int rpm_fd; unsigned char magic[2]; if (argc == 1) { rpm_fd = STDIN_FILENO; } else { rpm_fd = bb_xopen(argv[1], O_RDONLY); } bb_xread_all(rpm_fd, &lead, sizeof(struct rpm_lead)); if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) { bb_error_msg_and_die("Invalid RPM magic"); /* Just check the magic, the rest is irrelevant */ } /* Skip the signature header */ skip_header(rpm_fd); lseek(rpm_fd, (8 - (lseek(rpm_fd, 0, SEEK_CUR) % 8)) % 8, SEEK_CUR); /* Skip the main header */ skip_header(rpm_fd); bb_xread_all(rpm_fd, &magic, 2); if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) { bb_error_msg_and_die("Invalid gzip magic"); } check_header_gzip(rpm_fd); if (inflate_gunzip(rpm_fd, STDOUT_FILENO) != 0) { bb_error_msg("Error inflating"); } close(rpm_fd); return 0; }