792 lines
16 KiB
C
792 lines
16 KiB
C
/*-
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* Copyright (c) 2007-2014, Juniper Networks, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "stand.h"
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#include <sys/stat.h>
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#include <sys/stdint.h>
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#include <string.h>
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#include <zlib.h>
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#ifdef PKGFS_DEBUG
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#define DBG(x) printf x
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#else
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#define DBG(x)
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#endif
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static int pkg_open(const char *, struct open_file *);
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static int pkg_close(struct open_file *);
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static int pkg_read(struct open_file *, void *, size_t, size_t *);
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static off_t pkg_seek(struct open_file *, off_t, int);
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static int pkg_stat(struct open_file *, struct stat *);
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static int pkg_readdir(struct open_file *, struct dirent *);
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struct fs_ops pkgfs_fsops = {
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"pkg",
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pkg_open,
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pkg_close,
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pkg_read,
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null_write,
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pkg_seek,
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pkg_stat,
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pkg_readdir
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};
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#define PKG_BUFSIZE 512
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#define PKG_MAXCACHESZ 4096
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#define PKG_FILEEXT ".tgz"
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/*
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* Layout of POSIX 'ustar' header.
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*/
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struct ustar_hdr {
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char ut_name[100];
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char ut_mode[8];
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char ut_uid[8];
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char ut_gid[8];
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char ut_size[12];
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char ut_mtime[12];
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char ut_checksum[8];
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char ut_typeflag[1];
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char ut_linkname[100];
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char ut_magic[6]; /* For POSIX: "ustar\0" */
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char ut_version[2]; /* For POSIX: "00" */
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char ut_uname[32];
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char ut_gname[32];
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char ut_rdevmajor[8];
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char ut_rdevminor[8];
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union {
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struct {
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char prefix[155];
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} posix;
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struct {
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char atime[12];
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char ctime[12];
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char offset[12];
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char longnames[4];
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char unused[1];
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struct gnu_sparse {
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char offset[12];
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char numbytes[12];
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} sparse[4];
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char isextended[1];
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char realsize[12];
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} gnu;
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} u;
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u_char __padding[12];
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};
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struct package;
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struct tarfile
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{
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struct package *tf_pkg;
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struct tarfile *tf_next;
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struct ustar_hdr tf_hdr;
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off_t tf_ofs;
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off_t tf_size;
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off_t tf_fp;
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size_t tf_cachesz;
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void *tf_cache;
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};
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struct package
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{
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struct package *pkg_chain;
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int pkg_fd;
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off_t pkg_ofs;
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z_stream pkg_zs;
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struct tarfile *pkg_first;
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struct tarfile *pkg_last;
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u_char pkg_buf[PKG_BUFSIZE];
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};
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static struct package *package = NULL;
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static int new_package(int, struct package **);
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void
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pkgfs_cleanup(void)
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{
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struct package *chain;
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struct tarfile *tf, *tfn;
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while (package != NULL) {
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inflateEnd(&package->pkg_zs);
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close(package->pkg_fd);
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tf = package->pkg_first;
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while (tf != NULL) {
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tfn = tf->tf_next;
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if (tf->tf_cachesz > 0)
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free(tf->tf_cache);
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free(tf);
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tf = tfn;
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}
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chain = package->pkg_chain;
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free(package);
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package = chain;
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}
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}
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int
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pkgfs_init(const char *pkgname, struct fs_ops *proto)
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{
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struct package *pkg;
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int error, fd;
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if (proto != &pkgfs_fsops)
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pkgfs_cleanup();
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exclusive_file_system = proto;
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fd = open(pkgname, O_RDONLY);
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exclusive_file_system = NULL;
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if (fd == -1)
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return (errno);
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error = new_package(fd, &pkg);
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if (error) {
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close(fd);
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return (error);
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}
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if (pkg == NULL)
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return (EDOOFUS);
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pkg->pkg_chain = package;
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package = pkg;
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exclusive_file_system = &pkgfs_fsops;
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return (0);
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}
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static int get_mode(struct tarfile *);
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static int get_zipped(struct package *, void *, size_t);
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static int new_package(int, struct package **);
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static struct tarfile *scan_tarfile(struct package *, struct tarfile *);
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static int
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pkg_open(const char *fn, struct open_file *f)
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{
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struct tarfile *tf;
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if (fn == NULL || f == NULL)
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return (EINVAL);
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if (package == NULL)
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return (ENXIO);
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/*
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* We can only read from a package, so reject request to open
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* for write-only or read-write.
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*/
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if (f->f_flags != F_READ)
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return (EPERM);
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/*
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* Scan the file headers for the named file. We stop scanning
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* at the first filename that has the .pkg extension. This is
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* a package within a package. We assume we have all the files
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* we need up-front and without having to dig within nested
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* packages.
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*
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* Note that we preserve streaming properties as much as possible.
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*/
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while (*fn == '/')
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fn++;
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/*
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* Allow opening of the root directory for use by readdir()
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* to support listing files in the package.
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*/
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if (*fn == '\0') {
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f->f_fsdata = NULL;
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return (0);
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}
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tf = scan_tarfile(package, NULL);
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while (tf != NULL) {
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if (strcmp(fn, tf->tf_hdr.ut_name) == 0) {
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f->f_fsdata = tf;
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tf->tf_fp = 0; /* Reset the file pointer. */
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return (0);
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}
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tf = scan_tarfile(package, tf);
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}
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return (errno);
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}
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static int
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pkg_close(struct open_file *f)
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{
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struct tarfile *tf;
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tf = (struct tarfile *)f->f_fsdata;
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if (tf == NULL)
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return (0);
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/*
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* Free up the cache if we read all of the file.
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*/
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if (tf->tf_fp == tf->tf_size && tf->tf_cachesz > 0) {
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free(tf->tf_cache);
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tf->tf_cachesz = 0;
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}
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return (0);
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}
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static int
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pkg_read(struct open_file *f, void *buf, size_t size, size_t *res)
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{
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struct tarfile *tf;
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char *p;
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off_t fp;
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size_t sz;
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tf = (struct tarfile *)f->f_fsdata;
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if (tf == NULL) {
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if (res != NULL)
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*res = size;
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return (EBADF);
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}
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fp = tf->tf_fp;
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p = buf;
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sz = 0;
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while (size > 0) {
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sz = tf->tf_size - fp;
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if (fp < tf->tf_cachesz && tf->tf_cachesz < tf->tf_size)
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sz = tf->tf_cachesz - fp;
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if (size < sz)
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sz = size;
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if (sz == 0)
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break;
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if (fp < tf->tf_cachesz) {
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/* Satisfy the request from cache. */
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memcpy(p, tf->tf_cache + fp, sz);
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fp += sz;
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p += sz;
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size -= sz;
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continue;
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}
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if (get_zipped(tf->tf_pkg, p, sz) == -1) {
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sz = -1;
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break;
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}
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fp += sz;
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p += sz;
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size -= sz;
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if (tf->tf_cachesz != 0)
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continue;
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tf->tf_cachesz = (sz <= PKG_MAXCACHESZ) ? sz : PKG_MAXCACHESZ;
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tf->tf_cache = malloc(tf->tf_cachesz);
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if (tf->tf_cache != NULL)
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memcpy(tf->tf_cache, buf, tf->tf_cachesz);
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else
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tf->tf_cachesz = 0;
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}
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tf->tf_fp = fp;
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if (res != NULL)
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*res = size;
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return ((sz == -1) ? errno : 0);
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}
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static off_t
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pkg_seek(struct open_file *f, off_t ofs, int whence)
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{
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char buf[512];
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struct tarfile *tf;
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off_t delta;
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size_t sz, res;
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int error;
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tf = (struct tarfile *)f->f_fsdata;
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if (tf == NULL) {
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errno = EBADF;
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return (-1);
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}
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switch (whence) {
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case SEEK_SET:
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delta = ofs - tf->tf_fp;
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break;
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case SEEK_CUR:
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delta = ofs;
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break;
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case SEEK_END:
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delta = tf->tf_size - tf->tf_fp + ofs;
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break;
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default:
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errno = EINVAL;
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return (-1);
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}
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if (delta < 0) {
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DBG(("%s: negative file seek (%jd)\n", __func__,
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(intmax_t)delta));
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errno = ESPIPE;
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return (-1);
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}
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while (delta > 0 && tf->tf_fp < tf->tf_size) {
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sz = (delta > sizeof(buf)) ? sizeof(buf) : delta;
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error = pkg_read(f, buf, sz, &res);
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if (error != 0) {
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errno = error;
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return (-1);
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}
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delta -= sz - res;
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}
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return (tf->tf_fp);
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}
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static int
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pkg_stat(struct open_file *f, struct stat *sb)
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{
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struct tarfile *tf;
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tf = (struct tarfile *)f->f_fsdata;
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if (tf == NULL)
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return (EBADF);
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memset(sb, 0, sizeof(*sb));
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sb->st_mode = get_mode(tf);
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sb->st_size = tf->tf_size;
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sb->st_blocks = (tf->tf_size + 511) / 512;
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return (0);
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}
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static int
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pkg_readdir(struct open_file *f, struct dirent *d)
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{
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struct tarfile *tf;
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tf = (struct tarfile *)f->f_fsdata;
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if (tf != NULL)
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return (EBADF);
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tf = scan_tarfile(package, NULL);
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if (tf == NULL)
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return (ENOENT);
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d->d_fileno = 0;
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d->d_reclen = sizeof(*d);
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d->d_type = DT_REG;
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memcpy(d->d_name, tf->tf_hdr.ut_name, sizeof(d->d_name));
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return (0);
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}
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/*
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* Low-level support functions.
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*/
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static int
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get_byte(struct package *pkg, off_t *op)
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{
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int c;
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if (pkg->pkg_zs.avail_in == 0) {
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c = read(pkg->pkg_fd, pkg->pkg_buf, PKG_BUFSIZE);
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if (c <= 0)
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return (-1);
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pkg->pkg_zs.avail_in = c;
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pkg->pkg_zs.next_in = pkg->pkg_buf;
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}
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c = *pkg->pkg_zs.next_in;
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pkg->pkg_zs.next_in++;
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pkg->pkg_zs.avail_in--;
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(*op)++;
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return (c);
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}
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static int
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get_zipped(struct package *pkg, void *buf, size_t bufsz)
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{
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int c;
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pkg->pkg_zs.next_out = buf;
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pkg->pkg_zs.avail_out = bufsz;
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while (pkg->pkg_zs.avail_out) {
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if (pkg->pkg_zs.avail_in == 0) {
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c = read(pkg->pkg_fd, pkg->pkg_buf, PKG_BUFSIZE);
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if (c <= 0) {
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errno = EIO;
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return (-1);
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}
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pkg->pkg_zs.avail_in = c;
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pkg->pkg_zs.next_in = pkg->pkg_buf;
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}
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c = inflate(&pkg->pkg_zs, Z_SYNC_FLUSH);
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if (c != Z_OK && c != Z_STREAM_END) {
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errno = EIO;
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return (-1);
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}
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}
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pkg->pkg_ofs += bufsz;
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return (0);
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}
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static int
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cache_data(struct tarfile *tf)
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{
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struct package *pkg;
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size_t sz;
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if (tf == NULL) {
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DBG(("%s: no file to cache data for?\n", __func__));
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errno = EINVAL;
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return (-1);
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}
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pkg = tf->tf_pkg;
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if (pkg == NULL) {
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DBG(("%s: no package associated with file?\n", __func__));
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errno = EINVAL;
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return (-1);
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}
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if (tf->tf_ofs != pkg->pkg_ofs) {
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DBG(("%s: caching after partial read of file %s?\n",
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__func__, tf->tf_hdr.ut_name));
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errno = EINVAL;
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return (-1);
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}
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/* We don't cache everything... */
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if (tf->tf_size > PKG_MAXCACHESZ) {
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errno = ENOMEM;
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return (-1);
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}
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/* All files are padded to a multiple of 512 bytes. */
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sz = (tf->tf_size + 0x1ff) & ~0x1ff;
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tf->tf_cache = malloc(sz);
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if (tf->tf_cache == NULL) {
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DBG(("%s: could not allocate %d bytes\n", __func__, (int)sz));
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errno = ENOMEM;
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return (-1);
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}
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tf->tf_cachesz = sz;
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return (get_zipped(pkg, tf->tf_cache, sz));
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}
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/*
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* Note that this implementation does not (and should not!) obey
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* locale settings; you cannot simply substitute strtol here, since
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* it does obey locale.
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*/
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static off_t
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pkg_atol8(const char *p, unsigned char_cnt)
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{
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int64_t l, limit, last_digit_limit;
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int digit, sign, base;
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base = 8;
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limit = INT64_MAX / base;
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last_digit_limit = INT64_MAX % base;
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while (*p == ' ' || *p == '\t')
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p++;
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if (*p == '-') {
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sign = -1;
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p++;
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} else
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sign = 1;
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l = 0;
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digit = *p - '0';
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while (digit >= 0 && digit < base && char_cnt-- > 0) {
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if (l>limit || (l == limit && digit > last_digit_limit)) {
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l = UINT64_MAX; /* Truncate on overflow. */
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break;
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}
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l = (l * base) + digit;
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digit = *++p - '0';
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}
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return (sign < 0) ? -l : l;
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}
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/*
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* Parse a base-256 integer. This is just a straight signed binary
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* value in big-endian order, except that the high-order bit is
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* ignored. Remember that "int64_t" may or may not be exactly 64
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* bits; the implementation here tries to avoid making any assumptions
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* about the actual size of an int64_t. It does assume we're using
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* twos-complement arithmetic, though.
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*/
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static int64_t
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pkg_atol256(const char *_p, unsigned char_cnt)
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{
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int64_t l, upper_limit, lower_limit;
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const unsigned char *p = (const unsigned char *)_p;
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upper_limit = INT64_MAX / 256;
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lower_limit = INT64_MIN / 256;
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/* Pad with 1 or 0 bits, depending on sign. */
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if ((0x40 & *p) == 0x40)
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l = (int64_t)-1;
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else
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l = 0;
|
|
l = (l << 6) | (0x3f & *p++);
|
|
while (--char_cnt > 0) {
|
|
if (l > upper_limit) {
|
|
l = INT64_MAX; /* Truncate on overflow */
|
|
break;
|
|
} else if (l < lower_limit) {
|
|
l = INT64_MIN;
|
|
break;
|
|
}
|
|
l = (l << 8) | (0xff & (int64_t)*p++);
|
|
}
|
|
return (l);
|
|
}
|
|
|
|
static off_t
|
|
pkg_atol(const char *p, unsigned char_cnt)
|
|
{
|
|
/*
|
|
* Technically, GNU pkg considers a field to be in base-256
|
|
* only if the first byte is 0xff or 0x80.
|
|
*/
|
|
if (*p & 0x80)
|
|
return (pkg_atol256(p, char_cnt));
|
|
return (pkg_atol8(p, char_cnt));
|
|
}
|
|
|
|
static int
|
|
get_mode(struct tarfile *tf)
|
|
{
|
|
return (pkg_atol(tf->tf_hdr.ut_mode, sizeof(tf->tf_hdr.ut_mode)));
|
|
}
|
|
|
|
/* GZip flag byte */
|
|
#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
|
|
#define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
|
|
#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
|
|
#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
|
|
#define COMMENT 0x10 /* bit 4 set: file comment present */
|
|
#define RESERVED 0xE0 /* bits 5..7: reserved */
|
|
|
|
static int
|
|
new_package(int fd, struct package **pp)
|
|
{
|
|
struct package *pkg;
|
|
off_t ofs;
|
|
int flags, i, error;
|
|
|
|
pkg = malloc(sizeof(*pkg));
|
|
if (pkg == NULL)
|
|
return (ENOMEM);
|
|
|
|
bzero(pkg, sizeof(*pkg));
|
|
pkg->pkg_fd = fd;
|
|
|
|
/*
|
|
* Parse the header.
|
|
*/
|
|
error = EFTYPE;
|
|
ofs = 0;
|
|
|
|
/* Check megic. */
|
|
if (get_byte(pkg, &ofs) != 0x1f || get_byte(pkg, &ofs) != 0x8b)
|
|
goto fail;
|
|
/* Check method. */
|
|
if (get_byte(pkg, &ofs) != Z_DEFLATED)
|
|
goto fail;
|
|
/* Check flags. */
|
|
flags = get_byte(pkg, &ofs);
|
|
if (flags & RESERVED)
|
|
goto fail;
|
|
|
|
/* Skip time, xflags and OS code. */
|
|
for (i = 0; i < 6; i++) {
|
|
if (get_byte(pkg, &ofs) == -1)
|
|
goto fail;
|
|
}
|
|
|
|
/* Skip extra field. */
|
|
if (flags & EXTRA_FIELD) {
|
|
i = (get_byte(pkg, &ofs) & 0xff) |
|
|
((get_byte(pkg, &ofs) << 8) & 0xff);
|
|
while (i-- > 0) {
|
|
if (get_byte(pkg, &ofs) == -1)
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* Skip original file name. */
|
|
if (flags & ORIG_NAME) {
|
|
do {
|
|
i = get_byte(pkg, &ofs);
|
|
} while (i != 0 && i != -1);
|
|
if (i == -1)
|
|
goto fail;
|
|
}
|
|
|
|
/* Print the comment if it's there. */
|
|
if (flags & COMMENT) {
|
|
while (1) {
|
|
i = get_byte(pkg, &ofs);
|
|
if (i == -1)
|
|
goto fail;
|
|
if (i == 0)
|
|
break;
|
|
putchar(i);
|
|
}
|
|
}
|
|
|
|
/* Skip the CRC. */
|
|
if (flags & HEAD_CRC) {
|
|
if (get_byte(pkg, &ofs) == -1)
|
|
goto fail;
|
|
if (get_byte(pkg, &ofs) == -1)
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* Done parsing the ZIP header. Spkgt the inflation engine.
|
|
*/
|
|
error = inflateInit2(&pkg->pkg_zs, -15);
|
|
if (error != Z_OK)
|
|
goto fail;
|
|
|
|
*pp = pkg;
|
|
return (0);
|
|
|
|
fail:
|
|
free(pkg);
|
|
return (error);
|
|
}
|
|
|
|
static struct tarfile *
|
|
scan_tarfile(struct package *pkg, struct tarfile *last)
|
|
{
|
|
char buf[512];
|
|
struct tarfile *cur;
|
|
off_t ofs;
|
|
size_t sz;
|
|
|
|
cur = (last != NULL) ? last->tf_next : pkg->pkg_first;
|
|
if (cur == NULL) {
|
|
ofs = (last != NULL) ? last->tf_ofs + last->tf_size :
|
|
pkg->pkg_ofs;
|
|
ofs = (ofs + 0x1ff) & ~0x1ff;
|
|
|
|
/* Check if we've reached EOF. */
|
|
if (ofs < pkg->pkg_ofs) {
|
|
errno = ENOSPC;
|
|
return (NULL);
|
|
}
|
|
|
|
if (ofs != pkg->pkg_ofs) {
|
|
if (last != NULL && pkg->pkg_ofs == last->tf_ofs) {
|
|
if (cache_data(last) == -1)
|
|
return (NULL);
|
|
} else {
|
|
sz = ofs - pkg->pkg_ofs;
|
|
while (sz != 0) {
|
|
if (sz > sizeof(buf))
|
|
sz = sizeof(buf);
|
|
if (get_zipped(pkg, buf, sz) == -1)
|
|
return (NULL);
|
|
sz = ofs - pkg->pkg_ofs;
|
|
}
|
|
}
|
|
}
|
|
|
|
cur = malloc(sizeof(*cur));
|
|
if (cur == NULL)
|
|
return (NULL);
|
|
memset(cur, 0, sizeof(*cur));
|
|
cur->tf_pkg = pkg;
|
|
|
|
while (1) {
|
|
if (get_zipped(pkg, &cur->tf_hdr,
|
|
sizeof(cur->tf_hdr)) == -1) {
|
|
free(cur);
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* There are always 2 empty blocks appended to
|
|
* a PKG. It marks the end of the archive.
|
|
*/
|
|
if (strncmp(cur->tf_hdr.ut_magic, "ustar", 5) != 0) {
|
|
free(cur);
|
|
errno = ENOSPC;
|
|
return (NULL);
|
|
}
|
|
|
|
cur->tf_ofs = pkg->pkg_ofs;
|
|
cur->tf_size = pkg_atol(cur->tf_hdr.ut_size,
|
|
sizeof(cur->tf_hdr.ut_size));
|
|
|
|
if (cur->tf_hdr.ut_name[0] != '+')
|
|
break;
|
|
|
|
/*
|
|
* Skip package meta-files.
|
|
*/
|
|
ofs = cur->tf_ofs + cur->tf_size;
|
|
ofs = (ofs + 0x1ff) & ~0x1ff;
|
|
while (pkg->pkg_ofs < ofs) {
|
|
if (get_zipped(pkg, buf, sizeof(buf)) == -1) {
|
|
free(cur);
|
|
return (NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (last != NULL)
|
|
last->tf_next = cur;
|
|
else
|
|
pkg->pkg_first = cur;
|
|
pkg->pkg_last = cur;
|
|
}
|
|
|
|
return (cur);
|
|
}
|