diff options
Diffstat (limited to 'src/libs/3rdparty/libarchive/archive_read_disk_entry_from_file.c')
| -rw-r--r-- | src/libs/3rdparty/libarchive/archive_read_disk_entry_from_file.c | 1086 |
1 files changed, 1086 insertions, 0 deletions
diff --git a/src/libs/3rdparty/libarchive/archive_read_disk_entry_from_file.c b/src/libs/3rdparty/libarchive/archive_read_disk_entry_from_file.c new file mode 100644 index 000000000..ab0270bc2 --- /dev/null +++ b/src/libs/3rdparty/libarchive/archive_read_disk_entry_from_file.c @@ -0,0 +1,1086 @@ +/*- + * Copyright (c) 2003-2009 Tim Kientzle + * Copyright (c) 2010-2012 Michihiro NAKAJIMA + * Copyright (c) 2016 Martin Matuska + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "archive_platform.h" +__FBSDID("$FreeBSD"); + +/* This is the tree-walking code for POSIX systems. */ +#if !defined(_WIN32) || defined(__CYGWIN__) + +#ifdef HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif +#ifdef HAVE_SYS_EXTATTR_H +#include <sys/extattr.h> +#endif +#ifdef HAVE_SYS_IOCTL_H +#include <sys/ioctl.h> +#endif +#ifdef HAVE_SYS_PARAM_H +#include <sys/param.h> +#endif +#ifdef HAVE_SYS_STAT_H +#include <sys/stat.h> +#endif +#if defined(HAVE_SYS_XATTR_H) +#include <sys/xattr.h> +#elif defined(HAVE_ATTR_XATTR_H) +#include <attr/xattr.h> +#endif +#ifdef HAVE_SYS_EA_H +#include <sys/ea.h> +#endif +#ifdef HAVE_COPYFILE_H +#include <copyfile.h> +#endif +#ifdef HAVE_ERRNO_H +#include <errno.h> +#endif +#ifdef HAVE_FCNTL_H +#include <fcntl.h> +#endif +#ifdef HAVE_LIMITS_H +#include <limits.h> +#endif +#ifdef HAVE_LINUX_TYPES_H +#include <linux/types.h> +#endif +#ifdef HAVE_LINUX_FIEMAP_H +#include <linux/fiemap.h> +#endif +#ifdef HAVE_LINUX_FS_H +#include <linux/fs.h> +#endif +/* + * Some Linux distributions have both linux/ext2_fs.h and ext2fs/ext2_fs.h. + * As the include guards don't agree, the order of include is important. + */ +#ifdef HAVE_LINUX_EXT2_FS_H +#include <linux/ext2_fs.h> /* for Linux file flags */ +#endif +#if defined(HAVE_EXT2FS_EXT2_FS_H) && !defined(__CYGWIN__) +#include <ext2fs/ext2_fs.h> /* Linux file flags, broken on Cygwin */ +#endif +#ifdef HAVE_PATHS_H +#include <paths.h> +#endif +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif + +#include "archive.h" +#include "archive_entry.h" +#include "archive_private.h" +#include "archive_read_disk_private.h" + +#ifndef O_CLOEXEC +#define O_CLOEXEC 0 +#endif + +static int setup_mac_metadata(struct archive_read_disk *, + struct archive_entry *, int *fd); +#ifdef ARCHIVE_XATTR_FREEBSD +static int setup_xattrs_namespace(struct archive_read_disk *, + struct archive_entry *, int *, int); +#endif +static int setup_xattrs(struct archive_read_disk *, + struct archive_entry *, int *fd); +static int setup_sparse(struct archive_read_disk *, + struct archive_entry *, int *fd); +#if defined(HAVE_LINUX_FIEMAP_H) +static int setup_sparse_fiemap(struct archive_read_disk *, + struct archive_entry *, int *fd); +#endif + +#if !ARCHIVE_ACL_SUPPORT +int +archive_read_disk_entry_setup_acls(struct archive_read_disk *a, + struct archive_entry *entry, int *fd) +{ + (void)a; /* UNUSED */ + (void)entry; /* UNUSED */ + (void)fd; /* UNUSED */ + return (ARCHIVE_OK); +} +#endif + +/* + * Enter working directory and return working pathname of archive_entry. + * If a pointer to an integer is provided and its value is below zero + * open a file descriptor on this pathname. + */ +const char * +archive_read_disk_entry_setup_path(struct archive_read_disk *a, + struct archive_entry *entry, int *fd) +{ + const char *path; + + path = archive_entry_sourcepath(entry); + + if (path == NULL || (a->tree != NULL && + a->tree_enter_working_dir(a->tree) != 0)) + path = archive_entry_pathname(entry); + if (path == NULL) { + archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, + "Couldn't determine path"); + } else if (fd != NULL && *fd < 0 && a->tree != NULL && + (a->follow_symlinks || archive_entry_filetype(entry) != AE_IFLNK)) { + *fd = a->open_on_current_dir(a->tree, path, + O_RDONLY | O_NONBLOCK); + } + return (path); +} + +int +archive_read_disk_entry_from_file(struct archive *_a, + struct archive_entry *entry, + int fd, + const struct stat *st) +{ + struct archive_read_disk *a = (struct archive_read_disk *)_a; + const char *path, *name; + struct stat s; + int initial_fd = fd; + int r, r1; + + archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_ANY, + "archive_read_disk_entry_from_file"); + + archive_clear_error(_a); + path = archive_entry_sourcepath(entry); + if (path == NULL) + path = archive_entry_pathname(entry); + + if (a->tree == NULL) { + if (st == NULL) { +#if HAVE_FSTAT + if (fd >= 0) { + if (fstat(fd, &s) != 0) { + archive_set_error(&a->archive, errno, + "Can't fstat"); + return (ARCHIVE_FAILED); + } + } else +#endif +#if HAVE_LSTAT + if (!a->follow_symlinks) { + if (lstat(path, &s) != 0) { + archive_set_error(&a->archive, errno, + "Can't lstat %s", path); + return (ARCHIVE_FAILED); + } + } else +#endif + if (la_stat(path, &s) != 0) { + archive_set_error(&a->archive, errno, + "Can't stat %s", path); + return (ARCHIVE_FAILED); + } + st = &s; + } + archive_entry_copy_stat(entry, st); + } + + /* Lookup uname/gname */ + name = archive_read_disk_uname(_a, archive_entry_uid(entry)); + if (name != NULL) + archive_entry_copy_uname(entry, name); + name = archive_read_disk_gname(_a, archive_entry_gid(entry)); + if (name != NULL) + archive_entry_copy_gname(entry, name); + +#ifdef HAVE_STRUCT_STAT_ST_FLAGS + /* On FreeBSD, we get flags for free with the stat. */ + /* TODO: Does this belong in copy_stat()? */ + if ((a->flags & ARCHIVE_READDISK_NO_FFLAGS) == 0 && st->st_flags != 0) + archive_entry_set_fflags(entry, st->st_flags, 0); +#endif + +#if (defined(FS_IOC_GETFLAGS) && defined(HAVE_WORKING_FS_IOC_GETFLAGS)) || \ + (defined(EXT2_IOC_GETFLAGS) && defined(HAVE_WORKING_EXT2_IOC_GETFLAGS)) + /* Linux requires an extra ioctl to pull the flags. Although + * this is an extra step, it has a nice side-effect: We get an + * open file descriptor which we can use in the subsequent lookups. */ + if ((a->flags & ARCHIVE_READDISK_NO_FFLAGS) == 0 && + (S_ISREG(st->st_mode) || S_ISDIR(st->st_mode))) { + if (fd < 0) { + if (a->tree != NULL) + fd = a->open_on_current_dir(a->tree, path, + O_RDONLY | O_NONBLOCK | O_CLOEXEC); + else + fd = open(path, O_RDONLY | O_NONBLOCK | + O_CLOEXEC); + __archive_ensure_cloexec_flag(fd); + } + if (fd >= 0) { + int stflags; + r = ioctl(fd, +#if defined(FS_IOC_GETFLAGS) + FS_IOC_GETFLAGS, +#else + EXT2_IOC_GETFLAGS, +#endif + &stflags); + if (r == 0 && stflags != 0) + archive_entry_set_fflags(entry, stflags, 0); + } + } +#endif + +#if defined(HAVE_READLINK) || defined(HAVE_READLINKAT) + if (S_ISLNK(st->st_mode)) { + size_t linkbuffer_len = st->st_size; + char *linkbuffer; + int lnklen; + + linkbuffer = malloc(linkbuffer_len + 1); + if (linkbuffer == NULL) { + archive_set_error(&a->archive, ENOMEM, + "Couldn't read link data"); + return (ARCHIVE_FAILED); + } + if (a->tree != NULL) { +#ifdef HAVE_READLINKAT + lnklen = readlinkat(a->tree_current_dir_fd(a->tree), + path, linkbuffer, linkbuffer_len); +#else + if (a->tree_enter_working_dir(a->tree) != 0) { + archive_set_error(&a->archive, errno, + "Couldn't read link data"); + free(linkbuffer); + return (ARCHIVE_FAILED); + } + lnklen = readlink(path, linkbuffer, linkbuffer_len); +#endif /* HAVE_READLINKAT */ + } else + lnklen = readlink(path, linkbuffer, linkbuffer_len); + if (lnklen < 0) { + archive_set_error(&a->archive, errno, + "Couldn't read link data"); + free(linkbuffer); + return (ARCHIVE_FAILED); + } + linkbuffer[lnklen] = '\0'; + archive_entry_set_symlink(entry, linkbuffer); + free(linkbuffer); + } +#endif /* HAVE_READLINK || HAVE_READLINKAT */ + + r = 0; + if ((a->flags & ARCHIVE_READDISK_NO_ACL) == 0) + r = archive_read_disk_entry_setup_acls(a, entry, &fd); + if ((a->flags & ARCHIVE_READDISK_NO_XATTR) == 0) { + r1 = setup_xattrs(a, entry, &fd); + if (r1 < r) + r = r1; + } + if (a->flags & ARCHIVE_READDISK_MAC_COPYFILE) { + r1 = setup_mac_metadata(a, entry, &fd); + if (r1 < r) + r = r1; + } + if ((a->flags & ARCHIVE_READDISK_NO_SPARSE) == 0) { + r1 = setup_sparse(a, entry, &fd); + if (r1 < r) + r = r1; + } + + /* If we opened the file earlier in this function, close it. */ + if (initial_fd != fd) + close(fd); + return (r); +} + +#if defined(__APPLE__) && defined(HAVE_COPYFILE_H) +/* + * The Mac OS "copyfile()" API copies the extended metadata for a + * file into a separate file in AppleDouble format (see RFC 1740). + * + * Mac OS tar and cpio implementations store this extended + * metadata as a separate entry just before the regular entry + * with a "._" prefix added to the filename. + * + * Note that this is currently done unconditionally; the tar program has + * an option to discard this information before the archive is written. + * + * TODO: If there's a failure, report it and return ARCHIVE_WARN. + */ +static int +setup_mac_metadata(struct archive_read_disk *a, + struct archive_entry *entry, int *fd) +{ + int tempfd = -1; + int copyfile_flags = COPYFILE_NOFOLLOW | COPYFILE_ACL | COPYFILE_XATTR; + struct stat copyfile_stat; + int ret = ARCHIVE_OK; + void *buff = NULL; + int have_attrs; + const char *name, *tempdir; + struct archive_string tempfile; + + (void)fd; /* UNUSED */ + + name = archive_read_disk_entry_setup_path(a, entry, NULL); + if (name == NULL) + return (ARCHIVE_WARN); + + /* Short-circuit if there's nothing to do. */ + have_attrs = copyfile(name, NULL, 0, copyfile_flags | COPYFILE_CHECK); + if (have_attrs == -1) { + archive_set_error(&a->archive, errno, + "Could not check extended attributes"); + return (ARCHIVE_WARN); + } + if (have_attrs == 0) + return (ARCHIVE_OK); + + tempdir = NULL; + if (issetugid() == 0) + tempdir = getenv("TMPDIR"); + if (tempdir == NULL) + tempdir = _PATH_TMP; + archive_string_init(&tempfile); + archive_strcpy(&tempfile, tempdir); + archive_strcat(&tempfile, "tar.md.XXXXXX"); + tempfd = mkstemp(tempfile.s); + if (tempfd < 0) { + archive_set_error(&a->archive, errno, + "Could not open extended attribute file"); + ret = ARCHIVE_WARN; + goto cleanup; + } + __archive_ensure_cloexec_flag(tempfd); + + /* XXX I wish copyfile() could pack directly to a memory + * buffer; that would avoid the temp file here. For that + * matter, it would be nice if fcopyfile() actually worked, + * that would reduce the many open/close races here. */ + if (copyfile(name, tempfile.s, 0, copyfile_flags | COPYFILE_PACK)) { + archive_set_error(&a->archive, errno, + "Could not pack extended attributes"); + ret = ARCHIVE_WARN; + goto cleanup; + } + if (fstat(tempfd, ©file_stat)) { + archive_set_error(&a->archive, errno, + "Could not check size of extended attributes"); + ret = ARCHIVE_WARN; + goto cleanup; + } + buff = malloc(copyfile_stat.st_size); + if (buff == NULL) { + archive_set_error(&a->archive, errno, + "Could not allocate memory for extended attributes"); + ret = ARCHIVE_WARN; + goto cleanup; + } + if (copyfile_stat.st_size != read(tempfd, buff, copyfile_stat.st_size)) { + archive_set_error(&a->archive, errno, + "Could not read extended attributes into memory"); + ret = ARCHIVE_WARN; + goto cleanup; + } + archive_entry_copy_mac_metadata(entry, buff, copyfile_stat.st_size); + +cleanup: + if (tempfd >= 0) { + close(tempfd); + unlink(tempfile.s); + } + archive_string_free(&tempfile); + free(buff); + return (ret); +} + +#else + +/* + * Stub implementation for non-Mac systems. + */ +static int +setup_mac_metadata(struct archive_read_disk *a, + struct archive_entry *entry, int *fd) +{ + (void)a; /* UNUSED */ + (void)entry; /* UNUSED */ + (void)fd; /* UNUSED */ + return (ARCHIVE_OK); +} +#endif + +#if ARCHIVE_XATTR_LINUX || ARCHIVE_XATTR_DARWIN || ARCHIVE_XATTR_AIX + +/* + * Linux, Darwin and AIX extended attribute support. + * + * TODO: By using a stack-allocated buffer for the first + * call to getxattr(), we might be able to avoid the second + * call entirely. We only need the second call if the + * stack-allocated buffer is too small. But a modest buffer + * of 1024 bytes or so will often be big enough. Same applies + * to listxattr(). + */ + + +static int +setup_xattr(struct archive_read_disk *a, + struct archive_entry *entry, const char *name, int fd, const char *accpath) +{ + ssize_t size; + void *value = NULL; + + + if (fd >= 0) { +#if ARCHIVE_XATTR_LINUX + size = fgetxattr(fd, name, NULL, 0); +#elif ARCHIVE_XATTR_DARWIN + size = fgetxattr(fd, name, NULL, 0, 0, 0); +#elif ARCHIVE_XATTR_AIX + size = fgetea(fd, name, NULL, 0); +#endif + } else if (!a->follow_symlinks) { +#if ARCHIVE_XATTR_LINUX + size = lgetxattr(accpath, name, NULL, 0); +#elif ARCHIVE_XATTR_DARWIN + size = getxattr(accpath, name, NULL, 0, 0, XATTR_NOFOLLOW); +#elif ARCHIVE_XATTR_AIX + size = lgetea(accpath, name, NULL, 0); +#endif + } else { +#if ARCHIVE_XATTR_LINUX + size = getxattr(accpath, name, NULL, 0); +#elif ARCHIVE_XATTR_DARWIN + size = getxattr(accpath, name, NULL, 0, 0, 0); +#elif ARCHIVE_XATTR_AIX + size = getea(accpath, name, NULL, 0); +#endif + } + + if (size == -1) { + archive_set_error(&a->archive, errno, + "Couldn't query extended attribute"); + return (ARCHIVE_WARN); + } + + if (size > 0 && (value = malloc(size)) == NULL) { + archive_set_error(&a->archive, errno, "Out of memory"); + return (ARCHIVE_FATAL); + } + + + if (fd >= 0) { +#if ARCHIVE_XATTR_LINUX + size = fgetxattr(fd, name, value, size); +#elif ARCHIVE_XATTR_DARWIN + size = fgetxattr(fd, name, value, size, 0, 0); +#elif ARCHIVE_XATTR_AIX + size = fgetea(fd, name, value, size); +#endif + } else if (!a->follow_symlinks) { +#if ARCHIVE_XATTR_LINUX + size = lgetxattr(accpath, name, value, size); +#elif ARCHIVE_XATTR_DARWIN + size = getxattr(accpath, name, value, size, 0, XATTR_NOFOLLOW); +#elif ARCHIVE_XATTR_AIX + size = lgetea(accpath, name, value, size); +#endif + } else { +#if ARCHIVE_XATTR_LINUX + size = getxattr(accpath, name, value, size); +#elif ARCHIVE_XATTR_DARWIN + size = getxattr(accpath, name, value, size, 0, 0); +#elif ARCHIVE_XATTR_AIX + size = getea(accpath, name, value, size); +#endif + } + + if (size == -1) { + archive_set_error(&a->archive, errno, + "Couldn't read extended attribute"); + return (ARCHIVE_WARN); + } + + archive_entry_xattr_add_entry(entry, name, value, size); + + free(value); + return (ARCHIVE_OK); +} + +static int +setup_xattrs(struct archive_read_disk *a, + struct archive_entry *entry, int *fd) +{ + char *list, *p; + const char *path; + ssize_t list_size; + + path = NULL; + + if (*fd < 0) { + path = archive_read_disk_entry_setup_path(a, entry, fd); + if (path == NULL) + return (ARCHIVE_WARN); + } + + if (*fd >= 0) { +#if ARCHIVE_XATTR_LINUX + list_size = flistxattr(*fd, NULL, 0); +#elif ARCHIVE_XATTR_DARWIN + list_size = flistxattr(*fd, NULL, 0, 0); +#elif ARCHIVE_XATTR_AIX + list_size = flistea(*fd, NULL, 0); +#endif + } else if (!a->follow_symlinks) { +#if ARCHIVE_XATTR_LINUX + list_size = llistxattr(path, NULL, 0); +#elif ARCHIVE_XATTR_DARWIN + list_size = listxattr(path, NULL, 0, XATTR_NOFOLLOW); +#elif ARCHIVE_XATTR_AIX + list_size = llistea(path, NULL, 0); +#endif + } else { +#if ARCHIVE_XATTR_LINUX + list_size = listxattr(path, NULL, 0); +#elif ARCHIVE_XATTR_DARWIN + list_size = listxattr(path, NULL, 0, 0); +#elif ARCHIVE_XATTR_AIX + list_size = listea(path, NULL, 0); +#endif + } + + if (list_size == -1) { + if (errno == ENOTSUP || errno == ENOSYS) + return (ARCHIVE_OK); + archive_set_error(&a->archive, errno, + "Couldn't list extended attributes"); + return (ARCHIVE_WARN); + } + + if (list_size == 0) + return (ARCHIVE_OK); + + if ((list = malloc(list_size)) == NULL) { + archive_set_error(&a->archive, errno, "Out of memory"); + return (ARCHIVE_FATAL); + } + + if (*fd >= 0) { +#if ARCHIVE_XATTR_LINUX + list_size = flistxattr(*fd, list, list_size); +#elif ARCHIVE_XATTR_DARWIN + list_size = flistxattr(*fd, list, list_size, 0); +#elif ARCHIVE_XATTR_AIX + list_size = flistea(*fd, list, list_size); +#endif + } else if (!a->follow_symlinks) { +#if ARCHIVE_XATTR_LINUX + list_size = llistxattr(path, list, list_size); +#elif ARCHIVE_XATTR_DARWIN + list_size = listxattr(path, list, list_size, XATTR_NOFOLLOW); +#elif ARCHIVE_XATTR_AIX + list_size = llistea(path, list, list_size); +#endif + } else { +#if ARCHIVE_XATTR_LINUX + list_size = listxattr(path, list, list_size); +#elif ARCHIVE_XATTR_DARWIN + list_size = listxattr(path, list, list_size, 0); +#elif ARCHIVE_XATTR_AIX + list_size = listea(path, list, list_size); +#endif + } + + if (list_size == -1) { + archive_set_error(&a->archive, errno, + "Couldn't retrieve extended attributes"); + free(list); + return (ARCHIVE_WARN); + } + + for (p = list; (p - list) < list_size; p += strlen(p) + 1) { +#if ARCHIVE_XATTR_LINUX + /* Linux: skip POSIX.1e ACL extended attributes */ + if (strncmp(p, "system.", 7) == 0 && + (strcmp(p + 7, "posix_acl_access") == 0 || + strcmp(p + 7, "posix_acl_default") == 0)) + continue; + if (strncmp(p, "trusted.SGI_", 12) == 0 && + (strcmp(p + 12, "ACL_DEFAULT") == 0 || + strcmp(p + 12, "ACL_FILE") == 0)) + continue; + + /* Linux: xfsroot namespace is obsolete and unsupported */ + if (strncmp(p, "xfsroot.", 8) == 0) + continue; +#endif + setup_xattr(a, entry, p, *fd, path); + } + + free(list); + return (ARCHIVE_OK); +} + +#elif ARCHIVE_XATTR_FREEBSD + +/* + * FreeBSD extattr interface. + */ + +/* TODO: Implement this. Follow the Linux model above, but + * with FreeBSD-specific system calls, of course. Be careful + * to not include the system extattrs that hold ACLs; we handle + * those separately. + */ +static int +setup_xattr(struct archive_read_disk *a, struct archive_entry *entry, + int namespace, const char *name, const char *fullname, int fd, + const char *path); + +static int +setup_xattr(struct archive_read_disk *a, struct archive_entry *entry, + int namespace, const char *name, const char *fullname, int fd, + const char *accpath) +{ + ssize_t size; + void *value = NULL; + + if (fd >= 0) + size = extattr_get_fd(fd, namespace, name, NULL, 0); + else if (!a->follow_symlinks) + size = extattr_get_link(accpath, namespace, name, NULL, 0); + else + size = extattr_get_file(accpath, namespace, name, NULL, 0); + + if (size == -1) { + archive_set_error(&a->archive, errno, + "Couldn't query extended attribute"); + return (ARCHIVE_WARN); + } + + if (size > 0 && (value = malloc(size)) == NULL) { + archive_set_error(&a->archive, errno, "Out of memory"); + return (ARCHIVE_FATAL); + } + + if (fd >= 0) + size = extattr_get_fd(fd, namespace, name, value, size); + else if (!a->follow_symlinks) + size = extattr_get_link(accpath, namespace, name, value, size); + else + size = extattr_get_file(accpath, namespace, name, value, size); + + if (size == -1) { + free(value); + archive_set_error(&a->archive, errno, + "Couldn't read extended attribute"); + return (ARCHIVE_WARN); + } + + archive_entry_xattr_add_entry(entry, fullname, value, size); + + free(value); + return (ARCHIVE_OK); +} + +static int +setup_xattrs_namespace(struct archive_read_disk *a, + struct archive_entry *entry, int *fd, int namespace) +{ + char buff[512]; + char *list, *p; + ssize_t list_size; + const char *path; + + path = NULL; + + if (*fd < 0) { + path = archive_read_disk_entry_setup_path(a, entry, fd); + if (path == NULL) + return (ARCHIVE_WARN); + } + + if (*fd >= 0) + list_size = extattr_list_fd(*fd, namespace, NULL, 0); + else if (!a->follow_symlinks) + list_size = extattr_list_link(path, namespace, NULL, 0); + else + list_size = extattr_list_file(path, namespace, NULL, 0); + + if (list_size == -1 && errno == EOPNOTSUPP) + return (ARCHIVE_OK); + if (list_size == -1 && errno == EPERM) + return (ARCHIVE_OK); + if (list_size == -1) { + archive_set_error(&a->archive, errno, + "Couldn't list extended attributes"); + return (ARCHIVE_WARN); + } + + if (list_size == 0) + return (ARCHIVE_OK); + + if ((list = malloc(list_size)) == NULL) { + archive_set_error(&a->archive, errno, "Out of memory"); + return (ARCHIVE_FATAL); + } + + if (*fd >= 0) + list_size = extattr_list_fd(*fd, namespace, list, list_size); + else if (!a->follow_symlinks) + list_size = extattr_list_link(path, namespace, list, list_size); + else + list_size = extattr_list_file(path, namespace, list, list_size); + + if (list_size == -1) { + archive_set_error(&a->archive, errno, + "Couldn't retrieve extended attributes"); + free(list); + return (ARCHIVE_WARN); + } + + p = list; + while ((p - list) < list_size) { + size_t len = 255 & (int)*p; + char *name; + + if (namespace == EXTATTR_NAMESPACE_SYSTEM) { + if (!strcmp(p + 1, "nfs4.acl") || + !strcmp(p + 1, "posix1e.acl_access") || + !strcmp(p + 1, "posix1e.acl_default")) { + p += 1 + len; + continue; + } + strcpy(buff, "system."); + } else { + strcpy(buff, "user."); + } + name = buff + strlen(buff); + memcpy(name, p + 1, len); + name[len] = '\0'; + setup_xattr(a, entry, namespace, name, buff, *fd, path); + p += 1 + len; + } + + free(list); + return (ARCHIVE_OK); +} + +static int +setup_xattrs(struct archive_read_disk *a, + struct archive_entry *entry, int *fd) +{ + int namespaces[2]; + int i, res; + + namespaces[0] = EXTATTR_NAMESPACE_USER; + namespaces[1] = EXTATTR_NAMESPACE_SYSTEM; + + for (i = 0; i < 2; i++) { + res = setup_xattrs_namespace(a, entry, fd, + namespaces[i]); + switch (res) { + case (ARCHIVE_OK): + case (ARCHIVE_WARN): + break; + default: + return (res); + } + } + + return (ARCHIVE_OK); +} + +#else + +/* + * Generic (stub) extended attribute support. + */ +static int +setup_xattrs(struct archive_read_disk *a, + struct archive_entry *entry, int *fd) +{ + (void)a; /* UNUSED */ + (void)entry; /* UNUSED */ + (void)fd; /* UNUSED */ + return (ARCHIVE_OK); +} + +#endif + +#if defined(HAVE_LINUX_FIEMAP_H) + +/* + * Linux FIEMAP sparse interface. + * + * The FIEMAP ioctl returns an "extent" for each physical allocation + * on disk. We need to process those to generate a more compact list + * of logical file blocks. We also need to be very careful to use + * FIEMAP_FLAG_SYNC here, since there are reports that Linux sometimes + * does not report allocations for newly-written data that hasn't + * been synced to disk. + * + * It's important to return a minimal sparse file list because we want + * to not trigger sparse file extensions if we don't have to, since + * not all readers support them. + */ + +static int +setup_sparse_fiemap(struct archive_read_disk *a, + struct archive_entry *entry, int *fd) +{ + char buff[4096]; + struct fiemap *fm; + struct fiemap_extent *fe; + int64_t size; + int count, do_fiemap, iters; + int exit_sts = ARCHIVE_OK; + const char *path; + + if (archive_entry_filetype(entry) != AE_IFREG + || archive_entry_size(entry) <= 0 + || archive_entry_hardlink(entry) != NULL) + return (ARCHIVE_OK); + + if (*fd < 0) { + path = archive_read_disk_entry_setup_path(a, entry, NULL); + if (path == NULL) + return (ARCHIVE_FAILED); + + if (a->tree != NULL) + *fd = a->open_on_current_dir(a->tree, path, + O_RDONLY | O_NONBLOCK | O_CLOEXEC); + else + *fd = open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC); + if (*fd < 0) { + archive_set_error(&a->archive, errno, + "Can't open `%s'", path); + return (ARCHIVE_FAILED); + } + __archive_ensure_cloexec_flag(*fd); + } + + /* Initialize buffer to avoid the error valgrind complains about. */ + memset(buff, 0, sizeof(buff)); + count = (sizeof(buff) - sizeof(*fm))/sizeof(*fe); + fm = (struct fiemap *)buff; + fm->fm_start = 0; + fm->fm_length = ~0ULL;; + fm->fm_flags = FIEMAP_FLAG_SYNC; + fm->fm_extent_count = count; + do_fiemap = 1; + size = archive_entry_size(entry); + for (iters = 0; ; ++iters) { + int i, r; + + r = ioctl(*fd, FS_IOC_FIEMAP, fm); + if (r < 0) { + /* When something error happens, it is better we + * should return ARCHIVE_OK because an earlier + * version(<2.6.28) cannot perform FS_IOC_FIEMAP. */ + goto exit_setup_sparse_fiemap; + } + if (fm->fm_mapped_extents == 0) { + if (iters == 0) { + /* Fully sparse file; insert a zero-length "data" entry */ + archive_entry_sparse_add_entry(entry, 0, 0); + } + break; + } + fe = fm->fm_extents; + for (i = 0; i < (int)fm->fm_mapped_extents; i++, fe++) { + if (!(fe->fe_flags & FIEMAP_EXTENT_UNWRITTEN)) { + /* The fe_length of the last block does not + * adjust itself to its size files. */ + int64_t length = fe->fe_length; + if (fe->fe_logical + length > (uint64_t)size) + length -= fe->fe_logical + length - size; + if (fe->fe_logical == 0 && length == size) { + /* This is not sparse. */ + do_fiemap = 0; + break; + } + if (length > 0) + archive_entry_sparse_add_entry(entry, + fe->fe_logical, length); + } + if (fe->fe_flags & FIEMAP_EXTENT_LAST) + do_fiemap = 0; + } + if (do_fiemap) { + fe = fm->fm_extents + fm->fm_mapped_extents -1; + fm->fm_start = fe->fe_logical + fe->fe_length; + } else + break; + } +exit_setup_sparse_fiemap: + return (exit_sts); +} + +#if !defined(SEEK_HOLE) || !defined(SEEK_DATA) +static int +setup_sparse(struct archive_read_disk *a, + struct archive_entry *entry, int *fd) +{ + return setup_sparse_fiemap(a, entry, fd); +} +#endif +#endif /* defined(HAVE_LINUX_FIEMAP_H) */ + +#if defined(SEEK_HOLE) && defined(SEEK_DATA) + +/* + * SEEK_HOLE sparse interface (FreeBSD, Linux, Solaris) + */ + +static int +setup_sparse(struct archive_read_disk *a, + struct archive_entry *entry, int *fd) +{ + int64_t size; + off_t initial_off; + off_t off_s, off_e; + int exit_sts = ARCHIVE_OK; + int check_fully_sparse = 0; + const char *path; + + if (archive_entry_filetype(entry) != AE_IFREG + || archive_entry_size(entry) <= 0 + || archive_entry_hardlink(entry) != NULL) + return (ARCHIVE_OK); + + /* Does filesystem support the reporting of hole ? */ + if (*fd < 0) + path = archive_read_disk_entry_setup_path(a, entry, fd); + else + path = NULL; + + if (*fd >= 0) { +#ifdef _PC_MIN_HOLE_SIZE + if (fpathconf(*fd, _PC_MIN_HOLE_SIZE) <= 0) + return (ARCHIVE_OK); +#endif + initial_off = lseek(*fd, 0, SEEK_CUR); + if (initial_off != 0) + lseek(*fd, 0, SEEK_SET); + } else { + if (path == NULL) + return (ARCHIVE_FAILED); +#ifdef _PC_MIN_HOLE_SIZE + if (pathconf(path, _PC_MIN_HOLE_SIZE) <= 0) + return (ARCHIVE_OK); +#endif + *fd = open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC); + if (*fd < 0) { + archive_set_error(&a->archive, errno, + "Can't open `%s'", path); + return (ARCHIVE_FAILED); + } + __archive_ensure_cloexec_flag(*fd); + initial_off = 0; + } + +#ifndef _PC_MIN_HOLE_SIZE + /* Check if the underlying filesystem supports seek hole */ + off_s = lseek(*fd, 0, SEEK_HOLE); + if (off_s < 0) +#if defined(HAVE_LINUX_FIEMAP_H) + return setup_sparse_fiemap(a, entry, fd); +#else + goto exit_setup_sparse; +#endif + else if (off_s > 0) + lseek(*fd, 0, SEEK_SET); +#endif + + off_s = 0; + size = archive_entry_size(entry); + while (off_s < size) { + off_s = lseek(*fd, off_s, SEEK_DATA); + if (off_s == (off_t)-1) { + if (errno == ENXIO) { + /* no more hole */ + if (archive_entry_sparse_count(entry) == 0) { + /* Potentially a fully-sparse file. */ + check_fully_sparse = 1; + } + break; + } + archive_set_error(&a->archive, errno, + "lseek(SEEK_HOLE) failed"); + exit_sts = ARCHIVE_FAILED; + goto exit_setup_sparse; + } + off_e = lseek(*fd, off_s, SEEK_HOLE); + if (off_e == (off_t)-1) { + if (errno == ENXIO) { + off_e = lseek(*fd, 0, SEEK_END); + if (off_e != (off_t)-1) + break;/* no more data */ + } + archive_set_error(&a->archive, errno, + "lseek(SEEK_DATA) failed"); + exit_sts = ARCHIVE_FAILED; + goto exit_setup_sparse; + } + if (off_s == 0 && off_e == size) + break;/* This is not sparse. */ + archive_entry_sparse_add_entry(entry, off_s, + off_e - off_s); + off_s = off_e; + } + + if (check_fully_sparse) { + if (lseek(*fd, 0, SEEK_HOLE) == 0 && + lseek(*fd, 0, SEEK_END) == size) { + /* Fully sparse file; insert a zero-length "data" entry */ + archive_entry_sparse_add_entry(entry, 0, 0); + } + } +exit_setup_sparse: + lseek(*fd, initial_off, SEEK_SET); + return (exit_sts); +} + +#elif !defined(HAVE_LINUX_FIEMAP_H) + +/* + * Generic (stub) sparse support. + */ +static int +setup_sparse(struct archive_read_disk *a, + struct archive_entry *entry, int *fd) +{ + (void)a; /* UNUSED */ + (void)entry; /* UNUSED */ + (void)fd; /* UNUSED */ + return (ARCHIVE_OK); +} + +#endif + +#endif /* !defined(_WIN32) || defined(__CYGWIN__) */ + |