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Diffstat (limited to 'archival/libarchive/get_header_cpio.c')
-rw-r--r--archival/libarchive/get_header_cpio.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/archival/libarchive/get_header_cpio.c b/archival/libarchive/get_header_cpio.c
new file mode 100644
index 0000000..3d99b49
--- /dev/null
+++ b/archival/libarchive/get_header_cpio.c
@@ -0,0 +1,186 @@
+/* vi: set sw=4 ts=4: */
+/* Copyright 2002 Laurence Anderson
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+#include "libbb.h"
+#include "archive.h"
+
+typedef struct hardlinks_t {
+ struct hardlinks_t *next;
+ int inode; /* TODO: must match maj/min too! */
+ int mode ;
+ int mtime; /* These three are useful only in corner case */
+ int uid ; /* of hardlinks with zero size body */
+ int gid ;
+ char name[1];
+} hardlinks_t;
+
+char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
+{
+ file_header_t *file_header = archive_handle->file_header;
+ char cpio_header[110];
+ int namesize;
+ int major, minor, nlink, mode, inode;
+ unsigned size, uid, gid, mtime;
+
+ /* There can be padding before archive header */
+ data_align(archive_handle, 4);
+
+ size = full_read(archive_handle->src_fd, cpio_header, 110);
+ if (size == 0) {
+ goto create_hardlinks;
+ }
+ if (size != 110) {
+ bb_error_msg_and_die("short read");
+ }
+ archive_handle->offset += 110;
+
+ if (strncmp(&cpio_header[0], "07070", 5) != 0
+ || (cpio_header[5] != '1' && cpio_header[5] != '2')
+ ) {
+ bb_error_msg_and_die("unsupported cpio format, use newc or crc");
+ }
+
+ if (sscanf(cpio_header + 6,
+ "%8x" "%8x" "%8x" "%8x"
+ "%8x" "%8x" "%8x" /*maj,min:*/ "%*16c"
+ /*rmaj,rmin:*/"%8x" "%8x" "%8x" /*chksum: "%*8c"*/,
+ &inode, &mode, &uid, &gid,
+ &nlink, &mtime, &size,
+ &major, &minor, &namesize) != 10)
+ bb_error_msg_and_die("damaged cpio file");
+ file_header->mode = mode;
+ file_header->uid = uid;
+ file_header->gid = gid;
+ file_header->mtime = mtime;
+ file_header->size = size;
+
+ namesize &= 0x1fff; /* paranoia: limit names to 8k chars */
+ file_header->name = xzalloc(namesize + 1);
+ /* Read in filename */
+ xread(archive_handle->src_fd, file_header->name, namesize);
+ if (file_header->name[0] == '/') {
+ /* Testcase: echo /etc/hosts | cpio -pvd /tmp
+ * Without this code, it tries to unpack /etc/hosts
+ * into "/etc/hosts", not "etc/hosts".
+ */
+ char *p = file_header->name;
+ do p++; while (*p == '/');
+ overlapping_strcpy(file_header->name, p);
+ }
+ 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) {
+ /* Always round up. ">> 9" divides by 512 */
+ archive_handle->cpio__blocks = (uoff_t)(archive_handle->offset + 511) >> 9;
+ goto create_hardlinks;
+ }
+
+ file_header->link_target = NULL;
+ if (S_ISLNK(file_header->mode)) {
+ file_header->size &= 0x1fff; /* paranoia: limit names to 8k chars */
+ file_header->link_target = xzalloc(file_header->size + 1);
+ xread(archive_handle->src_fd, file_header->link_target, file_header->size);
+ archive_handle->offset += file_header->size;
+ file_header->size = 0; /* Stop possible seeks in future */
+ }
+
+// TODO: data_extract_all can't deal with hardlinks to non-files...
+// when fixed, change S_ISREG to !S_ISDIR here
+
+ if (nlink > 1 && S_ISREG(file_header->mode)) {
+ hardlinks_t *new = xmalloc(sizeof(*new) + namesize);
+ new->inode = inode;
+ new->mode = mode ;
+ new->mtime = mtime;
+ new->uid = uid ;
+ new->gid = gid ;
+ strcpy(new->name, file_header->name);
+ /* Put file on a linked list for later */
+ if (size == 0) {
+ new->next = archive_handle->cpio__hardlinks_to_create;
+ archive_handle->cpio__hardlinks_to_create = new;
+ return EXIT_SUCCESS; /* Skip this one */
+ /* TODO: this breaks cpio -t (it does not show hardlinks) */
+ }
+ new->next = archive_handle->cpio__created_hardlinks;
+ archive_handle->cpio__created_hardlinks = new;
+ }
+ file_header->device = makedev(major, minor);
+
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
+ archive_handle->action_data(archive_handle);
+//TODO: run "echo /etc/hosts | cpio -pv /tmp" twice. On 2nd run:
+//cpio: etc/hosts not created: newer or same age file exists
+//etc/hosts <-- should NOT show it
+//2 blocks <-- should say "0 blocks"
+ archive_handle->action_header(file_header);
+ } else {
+ data_skip(archive_handle);
+ }
+
+ archive_handle->offset += file_header->size;
+
+ free(file_header->link_target);
+ free(file_header->name);
+ file_header->link_target = NULL;
+ file_header->name = NULL;
+
+ return EXIT_SUCCESS;
+
+ create_hardlinks:
+ free(file_header->link_target);
+ free(file_header->name);
+
+ while (archive_handle->cpio__hardlinks_to_create) {
+ hardlinks_t *cur;
+ hardlinks_t *make_me = archive_handle->cpio__hardlinks_to_create;
+
+ archive_handle->cpio__hardlinks_to_create = make_me->next;
+
+ memset(file_header, 0, sizeof(*file_header));
+ file_header->mtime = make_me->mtime;
+ file_header->name = make_me->name;
+ file_header->mode = make_me->mode;
+ file_header->uid = make_me->uid;
+ file_header->gid = make_me->gid;
+ /*file_header->size = 0;*/
+ /*file_header->link_target = NULL;*/
+
+ /* Try to find a file we are hardlinked to */
+ cur = archive_handle->cpio__created_hardlinks;
+ while (cur) {
+ /* TODO: must match maj/min too! */
+ if (cur->inode == make_me->inode) {
+ file_header->link_target = cur->name;
+ /* link_target != NULL, size = 0: "I am a hardlink" */
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
+ archive_handle->action_data(archive_handle);
+ free(make_me);
+ goto next_link;
+ }
+ cur = cur->next;
+ }
+ /* Oops... no file with such inode was created... do it now
+ * (happens when hardlinked files are empty (zero length)) */
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
+ archive_handle->action_data(archive_handle);
+ /* Move to the list of created hardlinked files */
+ make_me->next = archive_handle->cpio__created_hardlinks;
+ archive_handle->cpio__created_hardlinks = make_me;
+ next_link: ;
+ }
+
+ while (archive_handle->cpio__created_hardlinks) {
+ hardlinks_t *p = archive_handle->cpio__created_hardlinks;
+ archive_handle->cpio__created_hardlinks = p->next;
+ free(p);
+ }
+
+ return EXIT_FAILURE; /* "No more files to process" */
+}