gpgv.c
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	/* gpgv.c - The GnuPG signature verify utility
	* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005, 2006,
	* 2008, 2009, 2012 Free Software Foundation, Inc.
	*
	* This file is part of GnuPG.
	*
	* GnuPG is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 3 of the License, or
	* (at your option) any later version.
	*
	* GnuPG is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include <config.h>
	#include <errno.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <ctype.h>
	#include <unistd.h>
	#ifdef HAVE_DOSISH_SYSTEM
	#include <fcntl.h> /* for setmode() */
	#endif
	#ifdef HAVE_LIBREADLINE
	#define GNUPG_LIBREADLINE_H_INCLUDED
	#include <readline/readline.h>
	#endif

	#define INCLUDED_BY_MAIN_MODULE 1
	#include "gpg.h"
	#include "util.h"
	#include "packet.h"
	#include "iobuf.h"
	#include "main.h"
	#include "options.h"
	#include "keydb.h"
	#include "trustdb.h"
	#include "filter.h"
	#include "ttyio.h"
	#include "i18n.h"
	#include "sysutils.h"
	#include "status.h"
	#include "call-agent.h"
	#include "../common/init.h"


	enum cmd_and_opt_values {
	aNull = 0,
	oQuiet = 'q',
	oVerbose = 'v',
	oBatch = 500,
	oKeyring,
	oIgnoreTimeConflict,
	oStatusFD,
	oLoggerFD,
	oHomedir,
	aTest
	};


	static ARGPARSE_OPTS opts[] = {
	ARGPARSE_group (300, N_("@\nOptions:\n ")),

	ARGPARSE_s_n (oVerbose, "verbose", N_("verbose")),
	ARGPARSE_s_n (oQuiet, "quiet", N_("be somewhat more quiet")),
	ARGPARSE_s_s (oKeyring, "keyring",
	N_("\|FILE\|take the keys from the keyring FILE")),
	ARGPARSE_s_n (oIgnoreTimeConflict, "ignore-time-conflict",
	N_("make timestamp conflicts only a warning")),
	ARGPARSE_s_i (oStatusFD, "status-fd",
	N_("\|FD\|write status info to this FD")),
	ARGPARSE_s_i (oLoggerFD, "logger-fd", "@"),
	ARGPARSE_s_s (oHomedir, "homedir", "@"),

	ARGPARSE_end ()
	};



	int g10_errors_seen = 0;


	static char *
	make_libversion (const char libname, const char (getfnc)(const char))
	{
	const char *s;
	char *result;

	s = getfnc (NULL);
	result = xmalloc (strlen (libname) + 1 + strlen (s) + 1);
	strcpy (stpcpy (stpcpy (result, libname), " "), s);
	return result;
	}

	static const char *
	my_strusage( int level )
	{
	static char *ver_gcry;
	const char *p;

	switch (level)
	{
	case 11: p = "@GPG@v (GnuPG)";
	break;
	case 13: p = VERSION; break;
	case 17: p = PRINTABLE_OS_NAME; break;
	case 19: p = _("Please report bugs to <@EMAIL@>.\n"); break;

	case 1:
	case 40: p = _("Usage: gpgv [options] [files] (-h for help)");
	break;
	case 41: p = _("Syntax: gpgv [options] [files]\n"
	"Check signatures against known trusted keys\n");
	break;

	case 20:
	if (!ver_gcry)
	ver_gcry = make_libversion ("libgcrypt", gcry_check_version);
	p = ver_gcry;
	break;


	default: p = NULL;
	}
	return p;
	}



	int
	main( int argc, char **argv )
	{
	ARGPARSE_ARGS pargs;
	int rc=0;
	strlist_t sl;
	strlist_t nrings = NULL;
	unsigned configlineno;
	ctrl_t ctrl;

	early_system_init ();
	set_strusage (my_strusage);
	log_set_prefix ("gpgv", 1);

	/* Make sure that our subsystems are ready. */
	i18n_init();
	init_common_subsystems (&argc, &argv);

	if (!gcry_check_version (NEED_LIBGCRYPT_VERSION) )
	{
	log_fatal ( _("%s is too old (need %s, have %s)\n"), "libgcrypt",
	NEED_LIBGCRYPT_VERSION, gcry_check_version (NULL) );
	}
	gcry_control (GCRYCTL_DISABLE_SECMEM, 0);

	gnupg_init_signals (0, NULL);

	opt.command_fd = -1; /* no command fd */
	opt.keyserver_options.options \|= KEYSERVER_AUTO_KEY_RETRIEVE;
	opt.trust_model = TM_ALWAYS;
	opt.batch = 1;

	opt.homedir = default_homedir ();

	tty_no_terminal(1);
	tty_batchmode(1);
	dotlock_disable ();
	gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);

	pargs.argc = &argc;
	pargs.argv = &argv;
	pargs.flags= 1; /* do not remove the args */
	while (optfile_parse( NULL, NULL, &configlineno, &pargs, opts))
	{
	switch (pargs.r_opt)
	{
	case oQuiet: opt.quiet = 1; break;
	case oVerbose:
	opt.verbose++;
	opt.list_sigs=1;
	gcry_control (GCRYCTL_SET_VERBOSITY, (int)opt.verbose);
	break;
	case oKeyring: append_to_strlist( &nrings, pargs.r.ret_str); break;
	case oStatusFD: set_status_fd( pargs.r.ret_int ); break;
	case oLoggerFD:
	log_set_fd (translate_sys2libc_fd_int (pargs.r.ret_int, 1));
	break;
	case oHomedir: opt.homedir = pargs.r.ret_str; break;
	case oIgnoreTimeConflict: opt.ignore_time_conflict = 1; break;
	default : pargs.err = ARGPARSE_PRINT_ERROR; break;
	}
	}

	if (log_get_errorcount (0))
	g10_exit(2);

	if (opt.verbose > 1)
	set_packet_list_mode(1);

	/* Note: We open all keyrings in read-only mode. */
	if (!nrings) /* No keyring given: use default one. */
	keydb_add_resource ("trustedkeys" EXTSEP_S "kbx",
	(KEYDB_RESOURCE_FLAG_READONLY
	\|KEYDB_RESOURCE_FLAG_GPGVDEF));
	for (sl = nrings; sl; sl = sl->next)
	keydb_add_resource (sl->d, KEYDB_RESOURCE_FLAG_READONLY);

	FREE_STRLIST (nrings);

	ctrl = xcalloc (1, sizeof *ctrl);

	if ((rc = verify_signatures (ctrl, argc, argv)))
	log_error("verify signatures failed: %s\n", gpg_strerror (rc) );

	xfree (ctrl);

	/* cleanup */
	g10_exit (0);
	return 8; /NOTREACHED/
	}


	void
	g10_exit( int rc )
	{
	rc = rc? rc : log_get_errorcount(0)? 2 : g10_errors_seen? 1 : 0;
	exit(rc );
	}


	/* Stub:
	* We have to override the trustcheck from pkclist.c becuase
	* this utility assumes that all keys in the keyring are trustworthy
	*/
	int
	check_signatures_trust( PKT_signature *sig )
	{
	(void)sig;
	return 0;
	}

	void
	read_trust_options(byte trust_model, ulong created, ulong *nextcheck,
	byte marginals, byte completes, byte *cert_depth,
	byte *min_cert_level)
	{
	(void)trust_model;
	(void)created;
	(void)nextcheck;
	(void)marginals;
	(void)completes;
	(void)cert_depth;
	(void)min_cert_level;
	}

	/* Stub:
	* We don't have the trustdb , so we have to provide some stub functions
	* instead
	*/

	int
	cache_disabled_value(PKT_public_key *pk)
	{
	(void)pk;
	return 0;
	}

	void
	check_trustdb_stale(void)
	{
	}

	int
	get_validity_info (PKT_public_key pk, PKT_user_id uid)
	{
	(void)pk;
	(void)uid;
	return '?';
	}

	unsigned int
	get_validity (PKT_public_key pk, PKT_user_id uid)
	{
	(void)pk;
	(void)uid;
	return 0;
	}

	const char *
	trust_value_to_string (unsigned int value)
	{
	(void)value;
	return "err";
	}

	const char *
	uid_trust_string_fixed (PKT_public_key key, PKT_user_id uid)
	{
	(void)key;
	(void)uid;
	return "err";
	}

	int
	get_ownertrust_info (PKT_public_key *pk)
	{
	(void)pk;
	return '?';
	}

	unsigned int
	get_ownertrust (PKT_public_key *pk)
	{
	(void)pk;
	return TRUST_UNKNOWN;
	}


	/* Stubs:
	* Because we only work with trusted keys, it does not make sense to
	* get them from a keyserver
	*/

	struct keyserver_spec *
	keyserver_match (struct keyserver_spec *spec)
	{
	(void)spec;
	return NULL;
	}

	int
	keyserver_import_keyid (u32 keyid, void dummy)
	{
	(void)keyid;
	(void)dummy;
	return -1;
	}

	int
	keyserver_import_cert (const char *name)
	{
	(void)name;
	return -1;
	}

	int
	keyserver_import_pka (const char name,unsigned char fpr)
	{
	(void)name;
	(void)fpr;
	return -1;
	}

	int
	keyserver_import_name (const char name,struct keyserver_spec spec)
	{
	(void)name;
	(void)spec;
	return -1;
	}

	int
	keyserver_import_ldap (const char *name)
	{
	(void)name;
	return -1;
	}

	/* Stub:
	* No encryption here but mainproc links to these functions.
	*/
	gpg_error_t
	get_session_key (PKT_pubkey_enc k, DEK dek)
	{
	(void)k;
	(void)dek;
	return GPG_ERR_GENERAL;
	}

	/* Stub: */
	gpg_error_t
	get_override_session_key (DEK dek, const char string)
	{
	(void)dek;
	(void)string;
	return GPG_ERR_GENERAL;
	}

	/* Stub: */
	int
	decrypt_data (ctrl_t ctrl, void procctx, PKT_encrypted ed, DEK *dek)
	{
	(void)ctrl;
	(void)procctx;
	(void)ed;
	(void)dek;
	return GPG_ERR_GENERAL;
	}


	/* Stub:
	* No interactive commands, so we don't need the helptexts
	*/
	void
	display_online_help (const char *keyword)
	{
	(void)keyword;
	}

	/* Stub:
	* We don't use secret keys, but getkey.c links to this
	*/
	int
	check_secret_key (PKT_public_key *pk, int n)
	{
	(void)pk;
	(void)n;
	return GPG_ERR_GENERAL;
	}

	/* Stub:
	* No secret key, so no passphrase needed
	*/
	DEK *
	passphrase_to_dek (u32 *keyid, int pubkey_algo,
	int cipher_algo, STRING2KEY *s2k, int mode,
	const char tmp, int canceled)
	{
	(void)keyid;
	(void)pubkey_algo;
	(void)cipher_algo;
	(void)s2k;
	(void)mode;
	(void)tmp;

	if (canceled)
	*canceled = 0;
	return NULL;
	}

	void
	passphrase_clear_cache (u32 keyid, const char cacheid, int algo)
	{
	(void)keyid;
	(void)cacheid;
	(void)algo;
	}

	struct keyserver_spec *
	parse_preferred_keyserver(PKT_signature *sig)
	{
	(void)sig;
	return NULL;
	}

	struct keyserver_spec *
	parse_keyserver_uri (const char *uri, int require_scheme,
	const char *configname, unsigned int configlineno)
	{
	(void)uri;
	(void)require_scheme;
	(void)configname;
	(void)configlineno;
	return NULL;
	}

	void
	free_keyserver_spec (struct keyserver_spec *keyserver)
	{
	(void)keyserver;
	}

	/* Stubs to avoid linking to photoid.c */
	void
	show_photos (const struct user_attribute attrs, int count, PKT_public_key pk)
	{
	(void)attrs;
	(void)count;
	(void)pk;
	}

	int
	parse_image_header (const struct user_attribute attr, byte type, u32 *len)
	{
	(void)attr;
	(void)type;
	(void)len;
	return 0;
	}

	char *
	image_type_to_string (byte type, int string)
	{
	(void)type;
	(void)string;
	return NULL;
	}

	#ifdef ENABLE_CARD_SUPPORT
	int
	agent_scd_getattr (const char name, struct agent_card_info_s info)
	{
	(void)name;
	(void)info;
	return 0;
	}
	#endif /* ENABLE_CARD_SUPPORT */

	/* We do not do any locking, so use these stubs here */
	void
	dotlock_disable (void)
	{
	}

	dotlock_t
	dotlock_create (const char *file_to_lock, unsigned int flags)
	{
	(void)file_to_lock;
	(void)flags;
	return NULL;
	}

	void
	dotlock_destroy (dotlock_t h)
	{
	(void)h;
	}

	int
	dotlock_take (dotlock_t h, long timeout)
	{
	(void)h;
	(void)timeout;
	return 0;
	}

	int
	dotlock_release (dotlock_t h)
	{
	(void)h;
	return 0;
	}

	void
	dotlock_remove_lockfiles (void)
	{
	}

	gpg_error_t
	agent_probe_secret_key (ctrl_t ctrl, PKT_public_key *pk)
	{
	(void)ctrl;
	(void)pk;
	return gpg_error (GPG_ERR_NO_SECKEY);
	}

	gpg_error_t
	agent_probe_any_secret_key (ctrl_t ctrl, kbnode_t keyblock)
	{
	(void)ctrl;
	(void)keyblock;
	return gpg_error (GPG_ERR_NO_SECKEY);
	}

	gpg_error_t
	agent_get_keyinfo (ctrl_t ctrl, const char hexkeygrip, char *r_serialno)
	{
	(void)ctrl;
	(void)hexkeygrip;
	*r_serialno = NULL;
	return gpg_error (GPG_ERR_NO_SECKEY);
	}

	gpg_error_t
	gpg_dirmngr_get_pka (ctrl_t ctrl, const char *userid,
	unsigned char *r_fpr, size_t r_fprlen,
	char **r_url)
	{
	(void)ctrl;
	(void)userid;
	if (r_fpr)
	*r_fpr = NULL;
	if (r_fprlen)
	*r_fprlen = 0;
	if (r_url)
	*r_url = NULL;
	return gpg_error (GPG_ERR_NOT_FOUND);
	}

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