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https://github.com/sheumann/hush.git
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162 lines
4.4 KiB
C
162 lines
4.4 KiB
C
/* vi: set sw=4 ts=4: */
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/* Copyright 2002 Laurence Anderson
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include "unarchive.h"
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typedef struct hardlinks_s {
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char *name;
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int inode;
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struct hardlinks_s *next;
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} hardlinks_t;
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char get_header_cpio(archive_handle_t *archive_handle)
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{
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static hardlinks_t *saved_hardlinks = NULL;
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static unsigned pending_hardlinks = 0;
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static int inode;
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file_header_t *file_header = archive_handle->file_header;
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char cpio_header[110];
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int namesize;
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char dummy[16];
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int major, minor, nlink;
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if (pending_hardlinks) { /* Deal with any pending hardlinks */
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hardlinks_t *tmp, *oldtmp;
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tmp = saved_hardlinks;
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oldtmp = NULL;
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file_header->link_target = file_header->name;
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file_header->size = 0;
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while (tmp) {
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if (tmp->inode != inode) {
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tmp = tmp->next;
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continue;
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}
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file_header->name = tmp->name;
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if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
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archive_handle->action_data(archive_handle);
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archive_handle->action_header(archive_handle->file_header);
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}
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pending_hardlinks--;
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oldtmp = tmp;
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tmp = tmp->next;
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free(oldtmp->name);
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free(oldtmp);
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if (oldtmp == saved_hardlinks)
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saved_hardlinks = tmp;
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}
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file_header->name = file_header->link_target;
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if (pending_hardlinks > 1) {
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bb_error_msg("error resolving hardlink: archive made by GNU cpio 2.0-2.2?");
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}
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/* No more pending hardlinks, read next file entry */
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pending_hardlinks = 0;
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}
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/* There can be padding before archive header */
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data_align(archive_handle, 4);
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if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) {
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return EXIT_FAILURE;
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}
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archive_handle->offset += 110;
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if (strncmp(&cpio_header[0], "07070", 5) != 0
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|| (cpio_header[5] != '1' && cpio_header[5] != '2')
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) {
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bb_error_msg_and_die("unsupported cpio format, use newc or crc");
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}
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{
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unsigned long tmpsize;
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sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
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dummy, &inode, (unsigned int*)&file_header->mode,
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(unsigned int*)&file_header->uid, (unsigned int*)&file_header->gid,
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&nlink, &file_header->mtime, &tmpsize,
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dummy, &major, &minor, &namesize, dummy);
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file_header->size = tmpsize;
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}
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free(file_header->name);
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file_header->name = xzalloc(namesize + 1);
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/* Read in filename */
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xread(archive_handle->src_fd, file_header->name, namesize);
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archive_handle->offset += namesize;
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/* Update offset amount and skip padding before file contents */
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data_align(archive_handle, 4);
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if (strcmp(file_header->name, "TRAILER!!!") == 0) {
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/* Always round up */
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printf("%d blocks\n", (int) (archive_handle->offset % 512 ?
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archive_handle->offset / 512 + 1 :
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archive_handle->offset / 512
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));
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if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
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hardlinks_t *tmp = saved_hardlinks;
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hardlinks_t *oldtmp = NULL;
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while (tmp) {
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bb_error_msg("%s not created: cannot resolve hardlink", tmp->name);
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oldtmp = tmp;
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tmp = tmp->next;
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free(oldtmp->name);
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free(oldtmp);
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}
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saved_hardlinks = NULL;
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pending_hardlinks = 0;
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}
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return EXIT_FAILURE;
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}
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if (S_ISLNK(file_header->mode)) {
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file_header->link_target = xzalloc(file_header->size + 1);
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xread(archive_handle->src_fd, file_header->link_target, file_header->size);
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archive_handle->offset += file_header->size;
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file_header->size = 0; /* Stop possible seeks in future */
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} else {
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file_header->link_target = NULL;
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}
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if (nlink > 1 && !S_ISDIR(file_header->mode)) {
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if (file_header->size == 0) { /* Put file on a linked list for later */
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hardlinks_t *new = xmalloc(sizeof(hardlinks_t));
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new->next = saved_hardlinks;
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new->inode = inode;
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/* name current allocated, freed later */
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new->name = file_header->name;
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file_header->name = NULL;
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saved_hardlinks = new;
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return EXIT_SUCCESS; /* Skip this one */
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}
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/* Found the file with data in */
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pending_hardlinks = nlink;
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}
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file_header->device = makedev(major, minor);
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if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
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archive_handle->action_data(archive_handle);
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archive_handle->action_header(archive_handle->file_header);
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} else {
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data_skip(archive_handle);
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}
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archive_handle->offset += file_header->size;
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free(file_header->link_target);
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return EXIT_SUCCESS;
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}
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