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398 lines
10 KiB
C
398 lines
10 KiB
C
/* gpgtar.c - A simple TAR implementation mainly useful for Windows.
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* Copyright (C) 2010 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* GnuPG comes with a shell script gpg-zip which creates archive files
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in the same format as PGP Zip, which is actually a USTAR format.
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That is fine and works nicely on all Unices but for Windows we
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don't have a compatible shell and the supply of tar programs is
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limited. Given that we need just a few tar option and it is an
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open question how many Unix concepts are to be mapped to Windows,
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we might as well write our own little tar customized for use with
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gpg. So here we go. */
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#include <config.h>
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#include <errno.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 <assert.h>
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#include "util.h"
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#include "i18n.h"
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#include "sysutils.h"
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#include "../common/openpgpdefs.h"
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#include "gpgtar.h"
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/* Constants to identify the commands and options. */
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enum cmd_and_opt_values
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{
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aNull = 0,
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aEncrypt = 'e',
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aDecrypt = 'd',
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aSign = 's',
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aList = 't',
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oSymmetric = 'c',
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oRecipient = 'r',
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oUser = 'u',
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oOutput = 'o',
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oQuiet = 'q',
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oVerbose = 'v',
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oFilesFrom = 'T',
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oNoVerbose = 500,
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aSignEncrypt,
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oSkipCrypto,
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oOpenPGP,
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oCMS,
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oSetFilename,
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oNull
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};
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/* The list of commands and options. */
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static ARGPARSE_OPTS opts[] = {
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ARGPARSE_group (300, N_("@Commands:\n ")),
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ARGPARSE_c (aEncrypt, "encrypt", N_("create an archive")),
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ARGPARSE_c (aDecrypt, "decrypt", N_("extract an archive")),
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ARGPARSE_c (aSign, "sign", N_("create a signed archive")),
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ARGPARSE_c (aList, "list-archive", N_("list an archive")),
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ARGPARSE_group (301, N_("@\nOptions:\n ")),
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ARGPARSE_s_n (oSymmetric, "symmetric", N_("use symmetric encryption")),
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ARGPARSE_s_s (oRecipient, "recipient", N_("|USER-ID|encrypt for USER-ID")),
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ARGPARSE_s_s (oUser, "local-user",
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N_("|USER-ID|use USER-ID to sign or decrypt")),
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ARGPARSE_s_s (oOutput, "output", N_("|FILE|write output to FILE")),
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ARGPARSE_s_n (oVerbose, "verbose", N_("verbose")),
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ARGPARSE_s_n (oQuiet, "quiet", N_("be somewhat more quiet")),
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ARGPARSE_s_n (oSkipCrypto, "skip-crypto", N_("skip the crypto processing")),
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ARGPARSE_s_s (oSetFilename, "set-filename", "@"),
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ARGPARSE_s_s (oFilesFrom, "files-from",
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N_("|FILE|get names to create from FILE")),
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ARGPARSE_s_n (oNull, "null", N_("-T reads null-terminated names")),
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ARGPARSE_s_n (oOpenPGP, "openpgp", "@"),
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ARGPARSE_s_n (oCMS, "cms", "@"),
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ARGPARSE_end ()
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};
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static void tar_and_encrypt (char **inpattern);
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static void decrypt_and_untar (const char *fname);
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static void decrypt_and_list (const char *fname);
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/* Print usage information and and provide strings for help. */
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static const char *
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my_strusage( int level )
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{
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const char *p;
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switch (level)
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{
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case 11: p = "gpgtar (GnuPG)";
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break;
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case 13: p = VERSION; break;
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case 17: p = PRINTABLE_OS_NAME; break;
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case 19: p = _("Please report bugs to <@EMAIL@>.\n"); break;
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case 1:
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case 40:
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p = _("Usage: gpgtar [options] [files] [directories] (-h for help)");
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break;
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case 41:
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p = _("Syntax: gpgtar [options] [files] [directories]\n"
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"Encrypt or sign files into an archive\n");
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break;
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default: p = NULL; break;
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}
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return p;
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}
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static void
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set_cmd (enum cmd_and_opt_values *ret_cmd, enum cmd_and_opt_values new_cmd)
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{
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enum cmd_and_opt_values cmd = *ret_cmd;
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if (!cmd || cmd == new_cmd)
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cmd = new_cmd;
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else if (cmd == aSign && new_cmd == aEncrypt)
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cmd = aSignEncrypt;
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else if (cmd == aEncrypt && new_cmd == aSign)
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cmd = aSignEncrypt;
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else
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{
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log_error (_("conflicting commands\n"));
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exit (2);
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}
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*ret_cmd = cmd;
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}
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/* gpgtar main. */
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int
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main (int argc, char **argv)
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{
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ARGPARSE_ARGS pargs;
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const char *fname;
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int no_more_options = 0;
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enum cmd_and_opt_values cmd = 0;
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int skip_crypto = 0;
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const char *files_from = NULL;
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int null_names = 0;
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assert (sizeof (struct ustar_raw_header) == 512);
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gnupg_reopen_std ("gpgtar");
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set_strusage (my_strusage);
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log_set_prefix ("gpgtar", 1);
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/* Make sure that our subsystems are ready. */
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i18n_init();
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init_common_subsystems (&argc, &argv);
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/* Parse the command line. */
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pargs.argc = &argc;
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pargs.argv = &argv;
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pargs.flags = ARGPARSE_FLAG_KEEP;
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while (!no_more_options && optfile_parse (NULL, NULL, NULL, &pargs, opts))
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{
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switch (pargs.r_opt)
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{
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case oOutput: opt.outfile = pargs.r.ret_str; break;
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case oSetFilename: opt.filename = pargs.r.ret_str; break;
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case oQuiet: opt.quiet = 1; break;
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case oVerbose: opt.verbose++; break;
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case oNoVerbose: opt.verbose = 0; break;
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case oFilesFrom: files_from = pargs.r.ret_str; break;
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case oNull: null_names = 1; break;
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case aList:
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case aDecrypt:
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case aEncrypt:
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case aSign:
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set_cmd (&cmd, pargs.r_opt);
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break;
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case oSymmetric:
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set_cmd (&cmd, aEncrypt);
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opt.symmetric = 1;
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break;
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case oSkipCrypto:
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skip_crypto = 1;
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break;
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case oOpenPGP: /* Dummy option for now. */ break;
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case oCMS: /* Dummy option for now. */ break;
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default: pargs.err = 2; break;
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}
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}
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if ((files_from && !null_names) || (!files_from && null_names))
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log_error ("--files-from and --null may only be used in conjunction\n");
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if (files_from && strcmp (files_from, "-"))
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log_error ("--files-from only supports argument \"-\"\n");
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if (log_get_errorcount (0))
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exit (2);
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switch (cmd)
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{
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case aList:
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if (argc > 1)
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usage (1);
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fname = argc ? *argv : NULL;
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if (opt.filename)
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log_info ("note: ignoring option --set-filename\n");
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if (files_from)
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log_info ("note: ignoring option --files-from\n");
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if (skip_crypto)
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gpgtar_list (fname);
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else
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decrypt_and_list (fname);
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break;
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case aEncrypt:
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if ((!argc && !null_names)
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|| (argc && null_names))
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usage (1);
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if (opt.filename)
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log_info ("note: ignoring option --set-filename\n");
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if (skip_crypto)
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gpgtar_create (null_names? NULL :argv);
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else
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tar_and_encrypt (null_names? NULL : argv);
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break;
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case aDecrypt:
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if (argc != 1)
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usage (1);
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if (opt.outfile)
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log_info ("note: ignoring option --output\n");
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if (files_from)
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log_info ("note: ignoring option --files-from\n");
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fname = argc ? *argv : NULL;
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if (skip_crypto)
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gpgtar_extract (fname);
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else
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decrypt_and_untar (fname);
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break;
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default:
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log_error (_("invalid command (there is no implicit command)\n"));
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break;
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}
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return log_get_errorcount (0)? 1:0;
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}
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/* Read the next record from STREAM. RECORD is a buffer provided by
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the caller and must be at leadt of size RECORDSIZE. The function
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return 0 on success and and error code on failure; a diagnostic
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printed as well. Note that there is no need for an EOF indicator
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because a tarball has an explicit EOF record. */
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gpg_error_t
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read_record (estream_t stream, void *record)
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{
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gpg_error_t err;
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size_t nread;
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nread = es_fread (record, 1, RECORDSIZE, stream);
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if (nread != RECORDSIZE)
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{
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err = gpg_error_from_syserror ();
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if (es_ferror (stream))
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log_error ("error reading `%s': %s\n",
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es_fname_get (stream), gpg_strerror (err));
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else
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log_error ("error reading `%s': premature EOF "
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"(size of last record: %zu)\n",
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es_fname_get (stream), nread);
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}
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else
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err = 0;
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return err;
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}
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/* Write the RECORD of size RECORDSIZE to STREAM. FILENAME is the
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name of the file used for diagnostics. */
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gpg_error_t
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write_record (estream_t stream, const void *record)
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{
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gpg_error_t err;
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size_t nwritten;
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nwritten = es_fwrite (record, 1, RECORDSIZE, stream);
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if (nwritten != RECORDSIZE)
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{
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err = gpg_error_from_syserror ();
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log_error ("error writing `%s': %s\n",
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es_fname_get (stream), gpg_strerror (err));
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}
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else
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err = 0;
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return err;
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}
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/* Return true if FP is an unarmored OpenPGP message. Note that this
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fucntion reads a few bytes from FP but pushes them back. */
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#if 0
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static int
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openpgp_message_p (estream_t fp)
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{
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int ctb;
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ctb = es_getc (fp);
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if (ctb != EOF)
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{
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if (es_ungetc (ctb, fp))
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log_fatal ("error ungetting first byte: %s\n",
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gpg_strerror (gpg_error_from_syserror ()));
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if ((ctb & 0x80))
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{
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switch ((ctb & 0x40) ? (ctb & 0x3f) : ((ctb>>2)&0xf))
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{
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case PKT_MARKER:
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case PKT_SYMKEY_ENC:
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case PKT_ONEPASS_SIG:
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case PKT_PUBKEY_ENC:
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case PKT_SIGNATURE:
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case PKT_COMMENT:
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case PKT_OLD_COMMENT:
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case PKT_PLAINTEXT:
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case PKT_COMPRESSED:
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case PKT_ENCRYPTED:
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return 1; /* Yes, this seems to be an OpenPGP message. */
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default:
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break;
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}
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}
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}
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return 0;
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}
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#endif
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static void
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tar_and_encrypt (char **inpattern)
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{
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(void)inpattern;
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log_error ("tar_and_encrypt has not yet been implemented\n");
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}
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static void
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decrypt_and_untar (const char *fname)
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{
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(void)fname;
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log_error ("decrypt_and_untar has not yet been implemented\n");
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}
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static void
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decrypt_and_list (const char *fname)
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{
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(void)fname;
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log_error ("decrypt_and_list has not yet been implemented\n");
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}
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