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https://github.com/sheumann/hush.git
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149 lines
4.3 KiB
C
149 lines
4.3 KiB
C
/* 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/sysmacros.h> /* major() and minor() */
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#include "unarchive.h"
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#include "libbb.h"
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typedef struct hardlinks_s {
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file_header_t *entry;
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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 short pending_hardlinks = 0;
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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, inode;
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if (pending_hardlinks) { /* Deal with any pending hardlinks */
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hardlinks_t *tmp;
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hardlinks_t *oldtmp;
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tmp = saved_hardlinks;
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oldtmp = NULL;
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while (tmp) {
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bb_error_msg_and_die("need to fix this\n");
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if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
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file_header = tmp->entry;
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if (oldtmp) {
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oldtmp->next = tmp->next; /* Remove item from linked list */
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} else {
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saved_hardlinks = tmp->next;
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}
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free(tmp);
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continue;
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}
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oldtmp = tmp;
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tmp = tmp->next;
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}
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pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
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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) || ((cpio_header[5] != '1') && (cpio_header[5] != '2'))) {
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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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file_header->name = (char *) xzalloc(namesize + 1);
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archive_xread_all(archive_handle, file_header->name, namesize); /* Read in filename */
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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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printf("%d blocks\n", (int) (archive_handle->offset % 512 ? (archive_handle->offset / 512) + 1 : archive_handle->offset / 512)); /* Always round up */
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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->entry->name);
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oldtmp = tmp;
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tmp = tmp->next;
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free (oldtmp->entry->name);
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free (oldtmp->entry);
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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_name = (char *) xzalloc(file_header->size + 1);
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archive_xread_all(archive_handle, file_header->link_name, 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_name = 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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new->entry = file_header;
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saved_hardlinks = new;
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return(EXIT_SUCCESS); // Skip this one
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} else { /* Found the file with data in */
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hardlinks_t *tmp = saved_hardlinks;
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pending_hardlinks = 1;
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while (tmp) {
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if (tmp->inode == inode) {
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tmp->entry->link_name = bb_xstrdup(file_header->name);
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nlink--;
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}
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tmp = tmp->next;
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}
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if (nlink > 1) {
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bb_error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
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}
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}
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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_name);
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return (EXIT_SUCCESS);
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}
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