* Limitations:
* Doesn't check CRC's
* Only supports new ASCII and CRC formats
- * Doesnt support hard links
*
*/
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#include "unarchive.h"
#include "busybox.h"
+typedef struct hardlinks_s {
+ file_header_t *entry;
+ int inode;
+ struct hardlinks_s *next;
+} hardlinks_t;
+
extern int cpio_main(int argc, char **argv)
{
- FILE *src_stream = stdin;
- char **extract_names = NULL;
- int extract_function = 0;
- int num_of_entries = 0;
- int opt = 0;
- mode_t oldmask = 0;
+ archive_handle_t *archive_handle;
+ int opt;
+
+ /* Initialise */
+ archive_handle = init_handle();
+ archive_handle->src_fd = fileno(stdin);
+ archive_handle->seek = seek_by_char;
+ archive_handle->action_header = header_list;
while ((opt = getopt(argc, argv, "idmuvtF:")) != -1) {
switch (opt) {
- case 'i': // extract
- extract_function |= extract_all_to_fs;
+ case 'i': /* extract */
+ archive_handle->action_data = data_extract_all;
break;
- case 'd': // create directories
- extract_function |= extract_create_dirs;
- oldmask = umask(077); /* Make create_path act like GNU cpio */
+ case 'd': /* create _leading_ directories */
+ archive_handle->flags |= ARCHIVE_CREATE_LEADING_DIRS;
break;
- case 'm': // preserve modification time
- extract_function |= extract_preserve_date;
+ case 'm': /* preserve modification time */
+ archive_handle->flags |= ARCHIVE_PRESERVE_DATE;
break;
- case 'v': // verbosly list files
- extract_function |= extract_verbose_list;
+ case 'v': /* verbosly list files */
+ archive_handle->action_header = header_verbose_list;
break;
- case 'u': // unconditional
- extract_function |= extract_unconditional;
+ case 'u': /* unconditional */
+ archive_handle->flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
break;
- case 't': // list files
- extract_function |= extract_list;
+ case 't': /* list files */
+ archive_handle->action_header = header_list;
break;
case 'F':
- src_stream = xfopen(optarg, "r");
+ archive_handle->src_fd = xopen(optarg, O_RDONLY);
+ archive_handle->seek = seek_by_jump;
break;
default:
show_usage();
}
}
- if (extract_function & extract_all_to_fs && extract_function & extract_list) {
- extract_function ^= extract_all_to_fs; /* If specify t, don't extract*/
+ while (optind < argc) {
+ archive_handle->filter = filter_accept_list;
+ archive_handle->accept = add_to_list(archive_handle->accept, argv[optind]);
+ optind++;
}
- if (extract_function & extract_all_to_fs && extract_function & extract_verbose_list) { /* The meaning of v changes on extract */
- extract_function ^= extract_verbose_list;
- extract_function |= extract_list;
+ while (1) {
+ static hardlinks_t *saved_hardlinks = NULL;
+ static unsigned short pending_hardlinks = 0;
+ file_header_t *file_header = archive_handle->file_header;
+ char cpio_header[110];
+ int namesize;
+ char dummy[16];
+ int major, minor, nlink, inode;
+ char extract_flag;
+
+ if (pending_hardlinks) { /* Deal with any pending hardlinks */
+ hardlinks_t *tmp;
+ hardlinks_t *oldtmp;
+
+ tmp = saved_hardlinks;
+ oldtmp = NULL;
+
+ while (tmp) {
+ error_msg_and_die("need to fix this\n");
+ if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
+ file_header = tmp->entry;
+ if (oldtmp) {
+ oldtmp->next = tmp->next; /* Remove item from linked list */
+ } else {
+ saved_hardlinks = tmp->next;
+ }
+ free(tmp);
+ continue;
+ }
+ oldtmp = tmp;
+ tmp = tmp->next;
+ }
+ pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
+ }
+
+ /* There can be padding before archive header */
+ data_align(archive_handle, 4);
+
+ if (archive_xread_all_eof(archive_handle, cpio_header, 110) == 0) {
+ return(EXIT_FAILURE);
+ }
+ archive_handle->offset += 110;
+
+ if (strncmp(&cpio_header[0], "07070", 5) != 0) {
+ printf("cpio header is %x-%x-%x-%x-%x\n",
+ cpio_header[0],
+ cpio_header[1],
+ cpio_header[2],
+ cpio_header[3],
+ cpio_header[4]);
+ error_msg_and_die("Unsupported cpio format");
+ }
+
+ if ((cpio_header[5] != '1') && (cpio_header[5] != '2')) {
+ error_msg_and_die("Unsupported cpio format, use newc or crc");
+ }
+
+ sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
+ dummy, &inode, (unsigned int*)&file_header->mode,
+ (unsigned int*)&file_header->uid, (unsigned int*)&file_header->gid,
+ &nlink, &file_header->mtime, &file_header->size,
+ dummy, &major, &minor, &namesize, dummy);
+
+ file_header->name = (char *) xmalloc(namesize + 1);
+ archive_xread_all(archive_handle, file_header->name, namesize); /* Read in filename */
+ file_header->name[namesize] = '\0';
+ archive_handle->offset += namesize;
+
+ /* Update offset amount and skip padding before file contents */
+ data_align(archive_handle, 4);
+
+ if (strcmp(file_header->name, "TRAILER!!!") == 0) {
+ printf("%d blocks\n", (int) (archive_handle->offset % 512 ? (archive_handle->offset / 512) + 1 : archive_handle->offset / 512)); /* Always round up */
+ if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
+ hardlinks_t *tmp = saved_hardlinks;
+ hardlinks_t *oldtmp = NULL;
+ while (tmp) {
+ error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
+ oldtmp = tmp;
+ tmp = tmp->next;
+ free (oldtmp->entry->name);
+ free (oldtmp->entry);
+ free (oldtmp);
+ }
+ saved_hardlinks = NULL;
+ pending_hardlinks = 0;
}
+ return(EXIT_FAILURE);
+ }
- extract_names = malloc(4);
- while (optind < argc) {
- num_of_entries++;
- *extract_names = realloc(*extract_names, num_of_entries);
- extract_names[num_of_entries - 1] = xstrdup(argv[optind]);
- optind++;
+ if (S_ISLNK(file_header->mode)) {
+ file_header->link_name = (char *) xmalloc(file_header->size + 1);
+ archive_xread_all(archive_handle, file_header->link_name, file_header->size);
+ file_header->link_name[file_header->size] = '\0';
+ archive_handle->offset += file_header->size;
+ file_header->size = 0; /* Stop possible seeks in future */
+ }
+ if (nlink > 1 && !S_ISDIR(file_header->mode)) {
+ if (file_header->size == 0) { /* Put file on a linked list for later */
+ hardlinks_t *new = xmalloc(sizeof(hardlinks_t));
+ new->next = saved_hardlinks;
+ new->inode = inode;
+ new->entry = file_header;
+ saved_hardlinks = new;
+ continue;
+ } else { /* Found the file with data in */
+ hardlinks_t *tmp = saved_hardlinks;
+ pending_hardlinks = 1;
+ while (tmp) {
+ if (tmp->inode == inode) {
+ tmp->entry->link_name = xstrdup(file_header->name);
+ nlink--;
+ }
+ tmp = tmp->next;
+ }
+ if (nlink > 1) {
+ error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
+ }
+ }
+ }
+ file_header->device = (major << 8) | minor;
+
+ extract_flag = FALSE;
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
+ struct stat statbuf;
+
+ extract_flag = TRUE;
+
+ /* Check if the file already exists */
+ if (lstat (file_header->name, &statbuf) == 0) {
+ if ((archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) || (statbuf.st_mtime < file_header->mtime)) {
+ /* Remove file if flag set or its older than the file to be extracted */
+ if (unlink(file_header->name) == -1) {
+ perror_msg_and_die("Couldnt remove old file");
+ }
+ } else {
+ if (! archive_handle->flags & ARCHIVE_EXTRACT_QUIET) {
+ error_msg("%s not created: newer or same age file exists", file_header->name);
+ }
+ extract_flag = FALSE;
+ }
+ }
+ archive_handle->action_header(file_header);
+ }
+
+ archive_handle->action_header(file_header);
+ if (extract_flag) {
+ archive_handle->action_data(archive_handle);
+ } else {
+ data_skip(archive_handle);
+ }
+ archive_handle->offset += file_header->size;
}
- unarchive(src_stream, &get_header_cpio, extract_function, "./", extract_names);
- if (oldmask) umask(oldmask); /* Restore umask if we changed it */
- return EXIT_SUCCESS;
+ return(EXIT_SUCCESS);
}
projects / oweals / busybox.git / blobdiff