From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Sat, 3 Jan 2015 13:58:15 +0100 Subject: patch to Vanilla Tomato 1.28 --- .../archival/libunarchive/get_header_cpio.c | 287 ++++++++++----------- 1 file changed, 140 insertions(+), 147 deletions(-) (limited to 'release/src/router/busybox/archival/libunarchive/get_header_cpio.c') diff --git a/release/src/router/busybox/archival/libunarchive/get_header_cpio.c b/release/src/router/busybox/archival/libunarchive/get_header_cpio.c index 975e2a4b..302f1223 100644 --- a/release/src/router/busybox/archival/libunarchive/get_header_cpio.c +++ b/release/src/router/busybox/archival/libunarchive/get_header_cpio.c @@ -1,189 +1,182 @@ -/* - * 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. +/* vi: set sw=4 ts=4: */ +/* Copyright 2002 Laurence Anderson * - * 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. + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ -#include -#include -#include -#include -#include "unarchive.h" #include "libbb.h" +#include "unarchive.h" -typedef struct hardlinks_s { - file_header_t *entry; - int inode; - struct hardlinks_s *next; +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; -extern char get_header_cpio(archive_handle_t *archive_handle) +char FAST_FUNC 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 */ - } + int major, minor, nlink, mode, inode; + unsigned size, uid, gid, mtime; + +#define hardlinks_to_create (*(hardlinks_t **)(&archive_handle->ah_priv[0])) +#define created_hardlinks (*(hardlinks_t **)(&archive_handle->ah_priv[1])) +#define block_count (archive_handle->ah_priv[2]) +// if (!archive_handle->ah_priv_inited) { +// archive_handle->ah_priv_inited = 1; +// hardlinks_to_create = NULL; +// created_hardlinks = NULL; +// } /* 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); + size = full_read(archive_handle->src_fd, cpio_header, 110); + if (size == 0) { + goto create_hardlinks; } - 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"); + if (size != 110) { + bb_error_msg_and_die("short read"); } + archive_handle->offset += 110; - { - 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; + 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"); } - file_header->name = (char *) xmalloc(namesize + 1); - archive_xread_all(archive_handle, file_header->name, namesize); /* Read in filename */ - file_header->name[namesize] = '\0'; + 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); 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); + /* Always round up. ">> 9" divides by 512 */ + block_count = (void*)(ptrdiff_t) ((archive_handle->offset + 511) >> 9); + goto create_hardlinks; } + file_header->link_target = NULL; 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'; + 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 */ } - 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; - } +// 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 = hardlinks_to_create; + hardlinks_to_create = new; + return EXIT_SUCCESS; /* Skip this one */ + /* TODO: this breaks cpio -t (it does not show hardlinks) */ } - archive_handle->action_header(file_header); + new->next = created_hardlinks; + created_hardlinks = new; } + file_header->device = makedev(major, minor); - archive_handle->action_header(file_header); - if (extract_flag) { + if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { archive_handle->action_data(archive_handle); + archive_handle->action_header(file_header); } else { data_skip(archive_handle); } + archive_handle->offset += file_header->size; - return (EXIT_SUCCESS); -} + 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 (hardlinks_to_create) { + hardlinks_t *cur; + hardlinks_t *make_me = hardlinks_to_create; + + 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 = 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 = created_hardlinks; + created_hardlinks = make_me; + next_link: ; + } + + while (created_hardlinks) { + hardlinks_t *p = created_hardlinks; + created_hardlinks = p->next; + free(p); + } + + return EXIT_FAILURE; /* "No more files to process" */ +} -- cgit v1.2.3-54-g00ecf