diff options
Diffstat (limited to 'release/src/router/busybox/archival/libunarchive/get_header_cpio.c')
| -rw-r--r-- | release/src/router/busybox/archival/libunarchive/get_header_cpio.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/release/src/router/busybox/archival/libunarchive/get_header_cpio.c b/release/src/router/busybox/archival/libunarchive/get_header_cpio.c new file mode 100644 index 00000000..975e2a4b --- /dev/null +++ b/release/src/router/busybox/archival/libunarchive/get_header_cpio.c @@ -0,0 +1,189 @@ +/* + * 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 Library 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 <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include "unarchive.h" +#include "libbb.h" + +typedef struct hardlinks_s { + file_header_t *entry; + int inode; + struct hardlinks_s *next; +} hardlinks_t; + +extern char get_header_cpio(archive_handle_t *archive_handle) +{ + 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) { + bb_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]); + bb_error_msg_and_die("Unsupported cpio format"); + } + + if ((cpio_header[5] != '1') && (cpio_header[5] != '2')) { + bb_error_msg_and_die("Unsupported cpio format, use newc or crc"); + } + + { + unsigned long tmpsize; + 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, &tmpsize, + dummy, &major, &minor, &namesize, dummy); + file_header->size = tmpsize; + } + + 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) { + bb_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); + } + + 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; + return(EXIT_SUCCESS); // Skip this one + } 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 = bb_xstrdup(file_header->name); + nlink--; + } + tmp = tmp->next; + } + if (nlink > 1) { + bb_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) { + bb_perror_msg_and_die("Couldnt remove old file"); + } + } else { + if (! archive_handle->flags & ARCHIVE_EXTRACT_QUIET) { + bb_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; + return (EXIT_SUCCESS); +} + |