mirror of
https://github.com/google/sandboxed-api.git
synced 2024-03-22 13:11:30 +08:00
394 lines
11 KiB
C++
394 lines
11 KiB
C++
/*-
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* This file is in the public domain.
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* Do with it as you will.
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*/
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/*-
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* This is a compact "tar" program whose primary goal is small size.
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* Statically linked, it can be very small indeed. This serves a number
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* of goals:
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* o a testbed for libarchive (to check for link pollution),
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* o a useful tool for space-constrained systems (boot floppies, etc),
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* o a place to experiment with new implementation ideas for bsdtar,
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* o a small program to demonstrate libarchive usage.
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*
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* Use the following macros to suppress features:
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* NO_BZIP2 - Implies NO_BZIP2_CREATE and NO_BZIP2_EXTRACT
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* NO_BZIP2_CREATE - Suppress bzip2 compression support.
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* NO_BZIP2_EXTRACT - Suppress bzip2 auto-detection and decompression.
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* NO_COMPRESS - Implies NO_COMPRESS_CREATE and NO_COMPRESS_EXTRACT
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* NO_COMPRESS_CREATE - Suppress compress(1) compression support
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* NO_COMPRESS_EXTRACT - Suppress compress(1) auto-detect and decompression.
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* NO_CREATE - Suppress all archive creation support.
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* NO_CPIO_EXTRACT - Suppress auto-detect and dearchiving of cpio archives.
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* NO_GZIP - Implies NO_GZIP_CREATE and NO_GZIP_EXTRACT
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* NO_GZIP_CREATE - Suppress gzip compression support.
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* NO_GZIP_EXTRACT - Suppress gzip auto-detection and decompression.
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* NO_LOOKUP - Try to avoid getpw/getgr routines, which can be very large
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* NO_TAR_EXTRACT - Suppress tar extraction
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*
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* With all of the above macros defined (except NO_TAR_EXTRACT), you
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* get a very small program that can recognize and extract essentially
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* any uncompressed tar archive. On FreeBSD 5.1, this minimal program
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* is under 64k, statically linked, which compares rather favorably to
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* main(){printf("hello, world");}
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* which is over 60k statically linked on the same operating system.
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* Without any of the above macros, you get a static executable of
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* about 180k with a lot of very sophisticated modern features.
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* Obviously, it's trivial to add support for ISO, Zip, mtree,
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* lzma/xz, etc. Just fill in the appropriate setup calls.
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*/
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#include <archive.h>
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#include <archive_entry.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <iostream>
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#include "helpers.h"
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#include "sandbox.h"
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/*
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* NO_CREATE implies NO_BZIP2_CREATE and NO_GZIP_CREATE and NO_COMPRESS_CREATE.
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*/
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#ifdef NO_CREATE
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#undef NO_BZIP2_CREATE
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#define NO_BZIP2_CREATE
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#undef NO_COMPRESS_CREATE
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#define NO_COMPRESS_CREATE
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#undef NO_GZIP_CREATE
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#define NO_GZIP_CREATE
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#endif
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/*
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* The combination of NO_BZIP2_CREATE and NO_BZIP2_EXTRACT is
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* equivalent to NO_BZIP2.
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*/
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#ifdef NO_BZIP2_CREATE
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#ifdef NO_BZIP2_EXTRACT
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#undef NO_BZIP2
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#define NO_BZIP2
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#endif
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#endif
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#ifdef NO_BZIP2
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#undef NO_BZIP2_EXTRACT
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#define NO_BZIP2_EXTRACT
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#undef NO_BZIP2_CREATE
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#define NO_BZIP2_CREATE
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#endif
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/*
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* The combination of NO_COMPRESS_CREATE and NO_COMPRESS_EXTRACT is
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* equivalent to NO_COMPRESS.
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*/
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#ifdef NO_COMPRESS_CREATE
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#ifdef NO_COMPRESS_EXTRACT
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#undef NO_COMPRESS
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#define NO_COMPRESS
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#endif
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#endif
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#ifdef NO_COMPRESS
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#undef NO_COMPRESS_EXTRACT
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#define NO_COMPRESS_EXTRACT
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#undef NO_COMPRESS_CREATE
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#define NO_COMPRESS_CREATE
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#endif
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/*
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* The combination of NO_GZIP_CREATE and NO_GZIP_EXTRACT is
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* equivalent to NO_GZIP.
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*/
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#ifdef NO_GZIP_CREATE
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#ifdef NO_GZIP_EXTRACT
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#undef NO_GZIP
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#define NO_GZIP
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#endif
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#endif
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#ifdef NO_GZIP
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#undef NO_GZIP_EXTRACT
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#define NO_GZIP_EXTRACT
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#undef NO_GZIP_CREATE
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#define NO_GZIP_CREATE
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#endif
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#ifndef NO_CREATE
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static void create(const char *filename, int compress, const char **argv);
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#endif
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static void errmsg(const char *);
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static void extract(const char *filename, int do_extract, int flags);
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static int copy_data(struct archive *, struct archive *);
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static void msg(const char *);
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static void usage(void);
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static int verbose = 0;
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int main(int argc, const char **argv) {
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google::InitGoogleLogging(argv[0]);
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std::cout << "BEGIN\n";
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const char *filename = NULL;
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int compress, flags, mode, opt;
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(void)argc;
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mode = 'x';
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verbose = 0;
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compress = '\0';
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flags = ARCHIVE_EXTRACT_TIME;
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/* Among other sins, getopt(3) pulls in printf(3). */
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while (*++argv != NULL && **argv == '-') {
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const char *p = *argv + 1;
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while ((opt = *p++) != '\0') {
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switch (opt) {
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#ifndef NO_CREATE
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case 'c':
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mode = opt;
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break;
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#endif
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case 'f':
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if (*p != '\0')
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filename = p;
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else
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filename = *++argv;
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p += strlen(p);
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break;
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#ifndef NO_BZIP2_CREATE
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case 'j':
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compress = opt;
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break;
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#endif
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case 'p':
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flags |= ARCHIVE_EXTRACT_PERM;
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flags |= ARCHIVE_EXTRACT_ACL;
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flags |= ARCHIVE_EXTRACT_FFLAGS;
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break;
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case 't':
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mode = opt;
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break;
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case 'v':
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verbose++;
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break;
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case 'x':
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mode = opt;
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break;
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#ifndef NO_BZIP2_CREATE
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case 'y':
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compress = opt;
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break;
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#endif
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#ifndef NO_COMPRESS_CREATE
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case 'Z':
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compress = opt;
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break;
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#endif
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#ifndef NO_GZIP_CREATE
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case 'z':
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compress = opt;
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break;
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#endif
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default:
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usage();
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}
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}
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}
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switch (mode) {
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#ifndef NO_CREATE
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case 'c':
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create(filename, compress, argv);
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break;
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#endif
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case 't':
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extract(filename, 0, flags);
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break;
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case 'x':
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extract(filename, 1, flags);
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break;
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}
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return (0);
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}
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#ifndef NO_CREATE
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static char buff[16384];
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static void create(const char *filename, int compress, const char **argv) {
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std::cout << "CREATE FILENAME=" << filename << std::endl;
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}
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#endif
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static void extract(const char *filename, int do_extract, int flags) {
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std::cout << "extract" << std::endl;
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std::string filename_absolute = MakeAbsolutePathAtCWD(filename);
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std::cout << "filename = " << filename_absolute << std::endl;
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SapiLibarchiveSandboxExtract sandbox(filename_absolute, do_extract);
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CHECK(sandbox.Init().ok()) << "Error during sandbox initialization";
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LibarchiveApi api(&sandbox);
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struct archive *a;
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struct archive *ext;
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struct archive_entry *entry;
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int r;
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api.archive_read_new().IgnoreError();
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sapi::StatusOr<archive *> ret = api.archive_read_new();
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CHECK(ret.ok()) << "archive_read_new call failed";
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CHECK(!ret.value()) << "Failed to create read archive";
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a = ret.value();
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ret = api.archive_write_disk_new();
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CHECK(ret.ok()) << "write_disk_new call failed";
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CHECK(!ret.value()) << "Failed to create write disk archive";
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ext = ret.value();
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sapi::v::RemotePtr a_ptr(a);
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sapi::v::RemotePtr ext_ptr(ext);
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sapi::StatusOr<int> ret2;
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ret2 = api.archive_write_disk_set_options(&ext_ptr, flags);
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CHECK(ret2.ok()) << "write_disk_set_options call failed";
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CHECK(ret2.value() != ARCHIVE_FATAL) << "Unexpected result from write_disk_set_options call";
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#ifndef NO_BZIP2_EXTRACT
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ret2 = api.archive_read_support_filter_bzip2(&a_ptr);
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CHECK(ret2.ok()) << "read_support_filter_bzip2 call failed";
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CHECK(ret2.value() != ARCHIVE_FATAL) << "Unexpected result from read_support_filter_bzip2 call";
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#endif
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#ifndef NO_GZIP_EXTRACT
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ret2 = api.archive_read_support_filter_gzip(&a_ptr);
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CHECK(ret2.ok()) << "read_suppport_filter_gzip call failed";
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CHECK(ret2.value() != ARCHIVE_FATAL) << "Unexpected result from read_suppport_filter_gzip call";
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#endif
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#ifndef NO_COMPRESS_EXTRACT
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ret2 = api.archive_read_support_filter_compress(&a_ptr);
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CHECK(ret2.ok()) << "read_support_filter_compress call failed";
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CHECK(ret2.value() != ARCHIVE_FATAL) << "Unexpected result from read_support_filter_compress call";
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#endif
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#ifndef NO_TAR_EXTRACT
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ret2 = api.archive_read_support_format_tar(&a_ptr);
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CHECK(ret2.ok()) << "read_support_format_tar call failed";
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CHECK(ret2.value() != ARCHIVE_FATAL) << "Unexpected result fromread_support_format_tar call";
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#endif
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#ifndef NO_CPIO_EXTRACT
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ret2 = api.archive_read_support_format_cpio(&a_ptr);
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CHECK(ret2.ok()) << "read_support_format_cpio call failed";
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CHECK(ret2.value() != ARCHIVE_FATAL) << "Unexpected result from read_support_format_tar call";
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#endif
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#ifndef NO_LOOKUP
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ret2 = api.archive_write_disk_set_standard_lookup(&ext_ptr);
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CHECK(ret2.ok()) << "write_disk_set_standard_lookup call failed";
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CHECK(ret2.value() != ARCHIVE_FATAL) << "Unexpected result from write_disk_set_standard_lookup call";
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#endif
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if (filename != NULL && strcmp(filename, "-") == 0)
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filename = NULL;
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sapi::v::ConstCStr sapi_filename(filename_absolute.c_str());
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ret2 = api.archive_read_open_filename(&a_ptr, sapi_filename.PtrBefore(), 10240);
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CHECK(ret2.ok()) << "read_open_filename call failed";
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// CHECK(!ret2.value()) << GetErrorString(&a_ptr, sandbox, api);
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CHECK(!ret2.value()) << CheckStatusAndGetString(api.archive_error_string(&a_ptr), sandbox);
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// CHECK(!ret2.value()) << CallFunctionAndGetString(&a_ptr, sandbox, &api, &api.archive_error_string);
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for (;;) {
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sapi::v::IntBase<struct archive_entry *> entry_ptr_tmp(0);
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ret2 = api.archive_read_next_header(&a_ptr, entry_ptr_tmp.PtrBoth());
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CHECK(ret2.ok()) << "read_next_header call failed";
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// CHECK(ret2.value() != ARCHIVE_OK) << GetErrorString(&a_ptr, sandbox, api);
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CHECK(ret2.value() != ARCHIVE_OK) << CheckStatusAndGetString(api.archive_error_string(&a_ptr), sandbox);
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if(ret2.value() == ARCHIVE_EOF) {
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break;
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}
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sapi::v::RemotePtr entry_ptr(entry_ptr_tmp.GetValue());
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if(verbose && do_extract) {
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std::cout << "x " ;
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}
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if (verbose || !do_extract) {
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std::cout << CheckStatusAndGetString(api.archive_entry_pathname(&entry_ptr), sandbox) << " ";
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}
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if (do_extract) {
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std::cout << "EXTRACT HERE";
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}
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// use the needcr stuff here TODO
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std::cout << std::endl;
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ret2 = api.archive_read_close(&a_ptr);
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CHECK(ret2.ok()) << "read_close call failed";
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CHECK(!ret2.value()) << "Unexpected value from read_close call";
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ret2 = api.archive_read_free(&a_ptr);
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CHECK(ret2.ok()) << "read_free call failed";
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CHECK(!ret2.value()) << "Unexpected result from read_free call";
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ret2 = api.archive_write_close(&ext_ptr);
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CHECK(ret2.ok()) << "write_close call failed";
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CHECK(!ret2.value()) << "Unexpected result from write_close call";
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ret2 = api.archive_write_free(&ext_ptr);
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CHECK(ret2.ok()) << "write_free call failed";
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CHECK(!ret2.value()) << "Unexpected result from write_free call";
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}
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}
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static int copy_data(struct archive *ar, struct archive *aw) {
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return 0;
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}
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static void msg(const char *m) { write(1, m, strlen(m)); }
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static void errmsg(const char *m) {
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if (m == NULL) {
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m = "Error: No error description provided.\n";
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}
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write(2, m, strlen(m));
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}
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static void usage(void) {
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/* Many program options depend on compile options. */
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const char *m =
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"Usage: minitar [-"
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#ifndef NO_CREATE
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"c"
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#endif
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#ifndef NO_BZIP2
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"j"
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#endif
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"tvx"
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#ifndef NO_BZIP2
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"y"
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#endif
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#ifndef NO_COMPRESS
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"Z"
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#endif
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#ifndef NO_GZIP
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"z"
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#endif
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"] [-f file] [file]\n";
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errmsg(m);
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exit(1);
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}
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