/*
 * Portions Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * Portions Copyright (C) Network Associates, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE
 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*! \file */

#include <ctype.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>

#include <openssl/opensslv.h>

#include <isc/attributes.h>
#include <isc/buffer.h>
#include <isc/commandline.h>
#include <isc/crypto.h>
#include <isc/lib.h>
#include <isc/log.h>
#include <isc/mem.h>
#include <isc/region.h>
#include <isc/result.h>
#include <isc/string.h>
#include <isc/util.h>

#include <dns/dnssec.h>
#include <dns/fixedname.h>
#include <dns/kasp.h>
#include <dns/keyvalues.h>
#include <dns/lib.h>
#include <dns/name.h>
#include <dns/rdataclass.h>
#include <dns/secalg.h>

#include <dst/dst.h>

#include "dnssectool.h"

/*
 * These are are set here for backwards compatibility.  They are
 * raised to 2048 in FIPS mode.
 */
static int min_rsa = 1024;
static int min_dh = 128;

ISC_NORETURN static void
usage(int ret);

static void
progress(int p);

struct keygen_ctx {
	const char *predecessor;
	const char *policy;
	const char *configfile;
	const char *directory;
	dns_keystore_t *keystore;
	char *algname;
	int size;
	uint16_t tag_min;
	uint16_t tag_max;
	dns_rdataclass_t rdclass;
	int options;
	dns_ttl_t ttl;
	bool wantzsk;
	bool wantksk;
	bool wantrev;
	dst_algorithm_t alg;
	/* timing data */
	int prepub;
	isc_stdtime_t now;
	isc_stdtime_t publish;
	isc_stdtime_t activate;
	isc_stdtime_t inactive;
	isc_stdtime_t revokekey;
	isc_stdtime_t deltime;
	isc_stdtime_t syncadd;
	isc_stdtime_t syncdel;
	bool setpub;
	bool setact;
	bool setinact;
	bool setrev;
	bool setdel;
	bool setsyncadd;
	bool setsyncdel;
	bool unsetpub;
	bool unsetact;
	bool unsetinact;
	bool unsetrev;
	bool unsetdel;
	/* how to generate the key */
	bool setttl;
	bool use_nsec3;
	bool genonly;
	bool showprogress;
	bool quiet;
	/* state */
	time_t lifetime;
	bool ksk;
	bool zsk;
};

typedef struct keygen_ctx keygen_ctx_t;

static void
usage(int ret) {
	fprintf(stderr, "Usage:\n");
	fprintf(stderr, "    %s [options] name\n\n", isc_commandline_progname);
	fprintf(stderr, "Version: %s\n", PACKAGE_VERSION);
	fprintf(stderr, "    name: owner of the key\n");
	fprintf(stderr, "Options:\n");
	fprintf(stderr, "    -K <directory>: write keys into directory\n");
	fprintf(stderr, "    -k <policy>: generate keys for dnssec-policy\n");
	fprintf(stderr, "    -l <file>: configuration file with dnssec-policy "
			"statement\n");
	fprintf(stderr, "    -a <algorithm>:\n");
	if (!isc_crypto_fips_mode()) {
		fprintf(stderr, "        RSASHA1 (deprecated) | NSEC3RSASHA1 "
				"(deprecated) |\n");
	}
	fprintf(stderr, "        RSASHA256 | RSASHA512 |\n");
	fprintf(stderr, "        ECDSAP256SHA256 | ECDSAP384SHA384 |\n");
	fprintf(stderr, "        ED25519 | ED448\n");
	fprintf(stderr, "    -3: use NSEC3-capable algorithm\n");
	fprintf(stderr, "    -b <key size in bits>:\n");
	if (!isc_crypto_fips_mode()) {
		fprintf(stderr, "        RSASHA1 (deprecated) :\t[%d..%d]\n",
			min_rsa, MAX_RSA);
		fprintf(stderr,
			"        NSEC3RSASHA1 (deprecated) :\t[%d..%d]\n",
			min_rsa, MAX_RSA);
	}
	fprintf(stderr, "        RSASHA256:\t[%d..%d]\n", min_rsa, MAX_RSA);
	fprintf(stderr, "        RSASHA512:\t[%d..%d]\n", min_rsa, MAX_RSA);
	fprintf(stderr, "        ECDSAP256SHA256:\tignored\n");
	fprintf(stderr, "        ECDSAP384SHA384:\tignored\n");
	fprintf(stderr, "        ED25519:\tignored\n");
	fprintf(stderr, "        ED448:\tignored\n");
	fprintf(stderr, "        (key size defaults are set according to\n"
			"        algorithm and usage (ZSK or KSK)\n");
	fprintf(stderr, "    -c <class>: (default: IN)\n");
	fprintf(stderr, "    -d <digest bits> (0 => max, default)\n");
	fprintf(stderr, "    -f <keyflag>: ZSK | KSK | REVOKE\n");
	fprintf(stderr, "    -F: FIPS mode\n");
	fprintf(stderr, "    -L <ttl>: default key TTL\n");
	fprintf(stderr, "    -M <min>:<max>: allowed Key ID range\n");
	fprintf(stderr, "    -T <rrtype>: DNSKEY | KEY (default: DNSKEY; "
			"use KEY for SIG(0))\n");
	fprintf(stderr, "    -h: print usage and exit\n");
	fprintf(stderr, "    -m <memory debugging mode>:\n");
	fprintf(stderr, "       usage | trace | record\n");
	fprintf(stderr, "    -v <level>: set verbosity level (0 - 10)\n");
	fprintf(stderr, "    -V: print version information\n");
	fprintf(stderr, "Timing options:\n");
	fprintf(stderr, "    -P date/[+-]offset/none: set key publication date "
			"(default: now)\n");
	fprintf(stderr, "    -P sync date/[+-]offset/none: set CDS and CDNSKEY "
			"publication date\n");
	fprintf(stderr, "    -A date/[+-]offset/none: set key activation date "
			"(default: now)\n");
	fprintf(stderr, "    -R date/[+-]offset/none: set key "
			"revocation date\n");
	fprintf(stderr, "    -I date/[+-]offset/none: set key "
			"inactivation date\n");
	fprintf(stderr, "    -D date/[+-]offset/none: set key deletion date\n");
	fprintf(stderr, "    -D sync date/[+-]offset/none: set CDS and CDNSKEY "
			"deletion date\n");

	fprintf(stderr, "    -G: generate key only; do not set -P or -A\n");
	fprintf(stderr, "    -S <key>: generate a successor to an existing "
			"key\n");
	fprintf(stderr, "    -i <interval>: prepublication interval for "
			"successor key "
			"(default: 30 days)\n");
	fprintf(stderr, "Output:\n");
	fprintf(stderr, "     K<name>+<alg>+<id>.key, "
			"K<name>+<alg>+<id>.private\n");

	exit(ret);
}

static void
progress(int p) {
	char c = '*';

	switch (p) {
	case 0:
		c = '.';
		break;
	case 1:
		c = '+';
		break;
	case 2:
		c = '*';
		break;
	case 3:
		c = ' ';
		break;
	default:
		break;
	}
	(void)putc(c, stderr);
	(void)fflush(stderr);
}

static void
keygen(keygen_ctx_t *ctx, const char *keyname) {
	char filename[255];
	char algstr[DNS_SECALG_FORMATSIZE];
	uint16_t flags = 0;
	bool conflict = false;
	bool show_progress = false;
	isc_buffer_t buf;
	dns_name_t *name;
	dns_fixedname_t fname;
	isc_result_t result;
	dst_key_t *key = NULL;
	dst_key_t *prevkey = NULL;

	dst_algorithm_format(ctx->alg, algstr, sizeof(algstr));

	if (ctx->predecessor == NULL) {
		if (ctx->prepub == -1) {
			ctx->prepub = 0;
		}

		name = dns_fixedname_initname(&fname);
		isc_buffer_constinit(&buf, keyname, strlen(keyname));
		isc_buffer_add(&buf, strlen(keyname));
		result = dns_name_fromtext(name, &buf, dns_rootname, 0);
		if (result != ISC_R_SUCCESS) {
			fatal("invalid key name %s: %s", keyname,
			      isc_result_totext(result));
		}

		if (!dst_algorithm_supported(ctx->alg)) {
			fatal("unsupported algorithm: %s", algstr);
		}

		if (isc_crypto_fips_mode()) {
			/* verify only in FIPS mode */
			switch (ctx->alg) {
			case DST_ALG_RSASHA1:
			case DST_ALG_NSEC3RSASHA1:
				fatal("unsupported algorithm: %s", algstr);
			default:
				break;
			}
		}

		if (ctx->use_nsec3) {
			switch (ctx->alg) {
			case DST_ALG_RSASHA1:
				ctx->alg = DST_ALG_NSEC3RSASHA1;
				break;
			case DST_ALG_NSEC3RSASHA1:
			case DST_ALG_RSASHA256:
			case DST_ALG_RSASHA512:
			case DST_ALG_RSASHA256PRIVATEOID:
			case DST_ALG_RSASHA512PRIVATEOID:
			case DST_ALG_ECDSA256:
			case DST_ALG_ECDSA384:
			case DST_ALG_ED25519:
			case DST_ALG_ED448:
				break;
			default:
				fatal("algorithm %s is incompatible with NSEC3"
				      ", do not use the -3 option",
				      algstr);
			}
		}

		if (ctx->size < 0) {
			switch (ctx->alg) {
			case DST_ALG_RSASHA1:
			case DST_ALG_NSEC3RSASHA1:
				if (isc_crypto_fips_mode()) {
					fatal("key size not specified (-b "
					      "option)");
				}
				FALLTHROUGH;
			case DST_ALG_RSASHA256:
			case DST_ALG_RSASHA512:
			case DST_ALG_RSASHA256PRIVATEOID:
			case DST_ALG_RSASHA512PRIVATEOID:
				ctx->size = 2048;
				if (verbose > 0) {
					fprintf(stderr,
						"key size not "
						"specified; defaulting"
						" to %d\n",
						ctx->size);
				}
				break;
			case DST_ALG_ECDSA256:
			case DST_ALG_ECDSA384:
			case DST_ALG_ED25519:
			case DST_ALG_ED448:
				break;
			default:
				fatal("key size not specified (-b option)");
			}
		}

		if (ctx->prepub > 0) {
			if (ctx->setpub && ctx->setact &&
			    (ctx->activate - ctx->prepub) < ctx->publish)
			{
				fatal("Activation and publication dates "
				      "are closer together than the\n\t"
				      "prepublication interval.");
			}

			if (!ctx->setpub && !ctx->setact) {
				ctx->setpub = ctx->setact = true;
				ctx->publish = ctx->now;
				ctx->activate = ctx->now + ctx->prepub;
			} else if (ctx->setpub && !ctx->setact) {
				ctx->setact = true;
				ctx->activate = ctx->publish + ctx->prepub;
			} else if (ctx->setact && !ctx->setpub) {
				ctx->setpub = true;
				ctx->publish = ctx->activate - ctx->prepub;
			}

			if ((ctx->activate - ctx->prepub) < ctx->now) {
				fatal("Time until activation is shorter "
				      "than the\n\tprepublication interval.");
			}
		}
	} else {
		char keystr[DST_KEY_FORMATSIZE];
		isc_stdtime_t when;
		int major, minor;

		if (ctx->prepub == -1) {
			ctx->prepub = (30 * 86400);
		}

		if (ctx->alg != 0) {
			fatal("-S and -a cannot be used together");
		}
		if (ctx->size >= 0) {
			fatal("-S and -b cannot be used together");
		}
		if (ctx->setpub || ctx->unsetpub) {
			fatal("-S and -P cannot be used together");
		}
		if (ctx->setact || ctx->unsetact) {
			fatal("-S and -A cannot be used together");
		}
		if (ctx->use_nsec3) {
			fatal("-S and -3 cannot be used together");
		}
		if (ctx->genonly) {
			fatal("-S and -G cannot be used together");
		}

		result = dst_key_fromnamedfile(
			ctx->predecessor, ctx->directory,
			DST_TYPE_PUBLIC | DST_TYPE_PRIVATE | DST_TYPE_STATE,
			isc_g_mctx, &prevkey);
		if (result != ISC_R_SUCCESS) {
			fatal("Invalid keyfile %s: %s", ctx->predecessor,
			      isc_result_totext(result));
		}
		if (!dst_key_isprivate(prevkey)) {
			fatal("%s is not a private key", ctx->predecessor);
		}

		name = dst_key_name(prevkey);
		ctx->alg = dst_key_alg(prevkey);
		ctx->size = dst_key_size(prevkey);
		flags = dst_key_flags(prevkey);

		dst_key_format(prevkey, keystr, sizeof(keystr));
		dst_key_getprivateformat(prevkey, &major, &minor);
		if (major != DST_MAJOR_VERSION || minor < DST_MINOR_VERSION) {
			fatal("Key %s has incompatible format version %d.%d\n\t"
			      "It is not possible to generate a successor key.",
			      keystr, major, minor);
		}

		result = dst_key_gettime(prevkey, DST_TIME_ACTIVATE, &when);
		if (result != ISC_R_SUCCESS) {
			fatal("Key %s has no activation date.\n\t"
			      "You must use dnssec-settime -A to set one "
			      "before generating a successor.",
			      keystr);
		}

		result = dst_key_gettime(prevkey, DST_TIME_INACTIVE,
					 &ctx->activate);
		if (result != ISC_R_SUCCESS) {
			fatal("Key %s has no inactivation date.\n\t"
			      "You must use dnssec-settime -I to set one "
			      "before generating a successor.",
			      keystr);
		}

		ctx->publish = ctx->activate - ctx->prepub;
		if (ctx->publish < ctx->now) {
			fatal("Key %s becomes inactive\n\t"
			      "sooner than the prepublication period "
			      "for the new key ends.\n\t"
			      "Either change the inactivation date with "
			      "dnssec-settime -I,\n\t"
			      "or use the -i option to set a shorter "
			      "prepublication interval.",
			      keystr);
		}

		result = dst_key_gettime(prevkey, DST_TIME_DELETE, &when);
		if (result != ISC_R_SUCCESS) {
			fprintf(stderr,
				"%s: WARNING: Key %s has no removal "
				"date;\n\t it will remain in the zone "
				"indefinitely after rollover.\n\t "
				"You can use dnssec-settime -D to "
				"change this.\n",
				isc_commandline_progname, keystr);
		}

		ctx->setpub = ctx->setact = true;
	}

	switch (ctx->alg) {
	case DST_ALG_RSASHA1:
	case DST_ALG_NSEC3RSASHA1:
		dns_secalg_format(ctx->alg, algstr, sizeof(algstr));
		fprintf(stderr,
			"WARNING: DNSKEY algorithm '%s' is deprecated. Please "
			"migrate to another algorithm\n",
			algstr);
		break;
	default:
		break;
	}

	switch (ctx->alg) {
	case DST_ALG_RSASHA1:
	case DST_ALG_NSEC3RSASHA1:
		if (isc_crypto_fips_mode()) {
			fatal("SHA1 based keys not supported in FIPS mode");
		}
		FALLTHROUGH;
	case DST_ALG_RSASHA256:
	case DST_ALG_RSASHA512:
	case DST_ALG_RSASHA256PRIVATEOID:
	case DST_ALG_RSASHA512PRIVATEOID:
		if (ctx->size != 0 &&
		    (ctx->size < min_rsa || ctx->size > MAX_RSA))
		{
			fatal("RSA key size %d out of range", ctx->size);
		}
		break;
	case DST_ALG_ECDSA256:
		ctx->size = 256;
		break;
	case DST_ALG_ECDSA384:
		ctx->size = 384;
		break;
	case DST_ALG_ED25519:
		ctx->size = 256;
		break;
	case DST_ALG_ED448:
		ctx->size = 456;
		break;
	default:
		fatal("not a dnskey algorithm %u\n", ctx->alg);
	}

	if ((ctx->options & DST_TYPE_KEY) == 0) {
		flags |= DNS_KEYOWNER_ZONE; /* DNSKEY: name type ZONE */
	}

	if (ctx->directory == NULL) {
		ctx->directory = ".";
	}

	if ((flags & DNS_KEYOWNER_ZONE) != 0) { /* DNSKEY */
		if (ctx->ksk || ctx->wantksk) {
			flags |= DNS_KEYFLAG_KSK;
		}
		if (ctx->wantrev) {
			flags |= DNS_KEYFLAG_REVOKE;
		}
	}

	switch (ctx->alg) {
	case DST_ALG_RSASHA1:
	case DST_ALG_NSEC3RSASHA1:
	case DST_ALG_RSASHA256:
	case DST_ALG_RSASHA512:
		show_progress = true;
		break;

	case DST_ALG_ECDSA256:
	case DST_ALG_ECDSA384:
	case DST_ALG_ED25519:
	case DST_ALG_ED448:
		show_progress = true;
		break;
	default:
		break;
	}

	isc_buffer_init(&buf, filename, sizeof(filename) - 1);

	do {
		conflict = false;

		if (!ctx->quiet && show_progress) {
			fprintf(stderr, "Generating key pair.");
		}

		if (ctx->keystore != NULL && ctx->policy != NULL) {
			result = dns_keystore_keygen(
				ctx->keystore, name, ctx->policy, ctx->rdclass,
				isc_g_mctx, ctx->alg, ctx->size, flags, &key);
		} else if (!ctx->quiet && show_progress) {
			result = dst_key_generate(name, ctx->alg, ctx->size, 0,
						  flags, DNS_KEYPROTO_DNSSEC,
						  ctx->rdclass, NULL,
						  isc_g_mctx, &key, &progress);
		} else {
			result = dst_key_generate(name, ctx->alg, ctx->size, 0,
						  flags, DNS_KEYPROTO_DNSSEC,
						  ctx->rdclass, NULL,
						  isc_g_mctx, &key, NULL);
		}

		if (!ctx->quiet && show_progress) {
			putc('\n', stderr);
			fflush(stderr);
		}

		if (result != ISC_R_SUCCESS) {
			char namestr[DNS_NAME_FORMATSIZE];
			dns_name_format(name, namestr, sizeof(namestr));
			fatal("failed to generate key %s/%s: %s\n", namestr,
			      algstr, isc_result_totext(result));
		}

		/*
		 * Set key timing metadata.
		 *
		 * Creation date is always set to "now".
		 *
		 * For a new key without an explicit predecessor, publish
		 * and activation dates are set to "now" by default, but
		 * can both be overridden.
		 *
		 * For a successor key, activation is set to match the
		 * predecessor's inactivation date.  Publish is set to 30
		 * days earlier than that (XXX: this should be configurable).
		 * If either of the resulting dates are in the past, that's
		 * an error; the inactivation date of the predecessor key
		 * must be updated before a successor key can be created.
		 */
		dst_key_settime(key, DST_TIME_CREATED, ctx->now);

		if (ctx->genonly && (ctx->setpub || ctx->setact)) {
			fatal("cannot use -G together with -P or -A options");
		}

		if (ctx->setpub) {
			dst_key_settime(key, DST_TIME_PUBLISH, ctx->publish);
		} else if (ctx->setact && !ctx->unsetpub) {
			dst_key_settime(key, DST_TIME_PUBLISH,
					ctx->activate - ctx->prepub);
		} else if (!ctx->genonly && !ctx->unsetpub) {
			dst_key_settime(key, DST_TIME_PUBLISH, ctx->now);
		}

		if (ctx->setact) {
			dst_key_settime(key, DST_TIME_ACTIVATE, ctx->activate);
		} else if (!ctx->genonly && !ctx->unsetact) {
			dst_key_settime(key, DST_TIME_ACTIVATE, ctx->now);
		}

		if (ctx->setrev) {
			if (!ctx->wantksk) {
				fprintf(stderr,
					"%s: warning: Key is not flagged "
					"as a KSK, but -R was used.  Revoking "
					"a ZSK is legal, but undefined.\n",
					isc_commandline_progname);
			}
			dst_key_settime(key, DST_TIME_REVOKE, ctx->revokekey);
		}

		if (ctx->setinact) {
			dst_key_settime(key, DST_TIME_INACTIVE, ctx->inactive);
		}

		if (ctx->setdel) {
			if (ctx->setinact && ctx->deltime < ctx->inactive) {
				fprintf(stderr,
					"%s: warning: Key is scheduled to be "
					"deleted before it is scheduled to be "
					"made inactive.\n",
					isc_commandline_progname);
			}
			dst_key_settime(key, DST_TIME_DELETE, ctx->deltime);
		}

		if (ctx->setsyncadd) {
			dst_key_settime(key, DST_TIME_SYNCPUBLISH,
					ctx->syncadd);
		}

		if (ctx->setsyncdel) {
			dst_key_settime(key, DST_TIME_SYNCDELETE, ctx->syncdel);
		}

		/* Set the default key TTL */
		if (ctx->setttl) {
			dst_key_setttl(key, ctx->ttl);
		}

		/* Set dnssec-policy related metadata */
		if (ctx->policy != NULL) {
			dst_key_setnum(key, DST_NUM_LIFETIME, ctx->lifetime);
			dst_key_setbool(key, DST_BOOL_KSK, ctx->ksk);
			dst_key_setbool(key, DST_BOOL_ZSK, ctx->zsk);
		}

		/*
		 * Do not overwrite an existing key, or create a key
		 * if there is a risk of ID collision due to this key
		 * or another key being revoked.
		 */
		if (key_collision(key, name, ctx->directory, isc_g_mctx,
				  ctx->tag_min, ctx->tag_max, NULL))
		{
			conflict = true;
			if (verbose > 0) {
				isc_buffer_clear(&buf);
				result = dst_key_buildfilename(
					key, 0, ctx->directory, &buf);
				if (result == ISC_R_SUCCESS) {
					fprintf(stderr,
						"%s: %s already exists, or "
						"might collide with another "
						"key upon revokation.  "
						"Generating a new key\n",
						isc_commandline_progname,
						filename);
				}
			}

			dst_key_free(&key);
		}
	} while (conflict);

	if (ctx->predecessor != NULL && prevkey != NULL) {
		dst_key_setnum(prevkey, DST_NUM_SUCCESSOR, dst_key_id(key));
		dst_key_setnum(key, DST_NUM_PREDECESSOR, dst_key_id(prevkey));

		result = dst_key_tofile(prevkey, ctx->options, ctx->directory);
		if (result != ISC_R_SUCCESS) {
			char keystr[DST_KEY_FORMATSIZE];
			dst_key_format(prevkey, keystr, sizeof(keystr));
			fatal("failed to update predecessor %s: %s\n", keystr,
			      isc_result_totext(result));
		}
	}

	result = dst_key_tofile(key, ctx->options, ctx->directory);
	if (result != ISC_R_SUCCESS) {
		char keystr[DST_KEY_FORMATSIZE];
		dst_key_format(key, keystr, sizeof(keystr));
		fatal("failed to write key %s: %s\n", keystr,
		      isc_result_totext(result));
	}

	isc_buffer_clear(&buf);
	result = dst_key_buildfilename(key, 0, NULL, &buf);
	if (result != ISC_R_SUCCESS) {
		fatal("dst_key_buildfilename returned: %s\n",
		      isc_result_totext(result));
	}
	printf("%s\n", filename);

	dst_key_free(&key);
	if (prevkey != NULL) {
		dst_key_free(&prevkey);
	}
}

static void
check_keystore_options(keygen_ctx_t *ctx) {
	ctx->directory = dns_keystore_directory(ctx->keystore, NULL);
	if (ctx->directory != NULL) {
		isc_result_t result = try_dir(ctx->directory);
		if (result != ISC_R_SUCCESS) {
			fatal("cannot open directory %s: %s", ctx->directory,
			      isc_result_totext(result));
		}
	}
}

int
main(int argc, char **argv) {
	char *algname = NULL, *freeit = NULL;
	char *classname = NULL;
	char *endp;
	isc_result_t result;
	isc_textregion_t r;
	unsigned char c;
	int ch;

	keygen_ctx_t ctx = {
		.options = DST_TYPE_PRIVATE | DST_TYPE_PUBLIC,
		.prepub = -1,
		.size = -1,
		.now = isc_stdtime_now(),
	};

	if (argc == 1) {
		usage(EXIT_FAILURE);
	}

	isc_commandline_init(argc, argv);

	isc_commandline_errprint = false;

	/*
	 * Process memory debugging argument first.
	 */
#define CMDLINE_FLAGS                                          \
	"3A:a:b:Cc:D:d:E:Ff:GhI:i:K:k:L:l:M:m:n:P:p:qR:r:S:s:" \
	"T:t:v:V"
	while ((ch = isc_commandline_parse(argc, argv, CMDLINE_FLAGS)) != -1) {
		switch (ch) {
		case 'm':
			if (strcasecmp(isc_commandline_argument, "record") == 0)
			{
				isc_mem_debugon(ISC_MEM_DEBUGRECORD);
			}
			if (strcasecmp(isc_commandline_argument, "trace") == 0)
			{
				isc_mem_debugon(ISC_MEM_DEBUGTRACE);
			}
			if (strcasecmp(isc_commandline_argument, "usage") == 0)
			{
				isc_mem_debugon(ISC_MEM_DEBUGUSAGE);
			}
			break;
		default:
			break;
		}
	}
	isc_commandline_reset = true;

	while ((ch = isc_commandline_parse(argc, argv, CMDLINE_FLAGS)) != -1) {
		switch (ch) {
		case '3':
			ctx.use_nsec3 = true;
			break;
		case 'a':
			algname = isc_commandline_argument;
			break;
		case 'b':
			ctx.size = strtol(isc_commandline_argument, &endp, 10);
			if (*endp != '\0' || ctx.size < 0) {
				fatal("-b requires a non-negative number");
			}
			break;
		case 'C':
			fatal("The -C option has been deprecated.");
			break;
		case 'c':
			classname = isc_commandline_argument;
			break;
		case 'd':
			fatal("The -d option has been deprecated.");
			break;
		case 'E':
			fatal("%s", isc_result_totext(DST_R_NOENGINE));
			break;
		case 'f':
			c = (unsigned char)(isc_commandline_argument[0]);
			if (toupper(c) == 'K') {
				ctx.wantksk = true;
			} else if (toupper(c) == 'Z') {
				ctx.wantzsk = true;
			} else if (toupper(c) == 'R') {
				ctx.wantrev = true;
			} else {
				fatal("unknown flag '%s'",
				      isc_commandline_argument);
			}
			break;
		case 'K':
			ctx.directory = isc_commandline_argument;
			result = try_dir(ctx.directory);
			if (result != ISC_R_SUCCESS) {
				fatal("cannot open directory %s: %s",
				      ctx.directory, isc_result_totext(result));
			}
			break;
		case 'k':
			ctx.policy = isc_commandline_argument;
			break;
		case 'L':
			ctx.ttl = strtottl(isc_commandline_argument);
			ctx.setttl = true;
			break;
		case 'l':
			ctx.configfile = isc_commandline_argument;
			break;
		case 'n':
			fatal("The -n option has been deprecated.");
			break;
		case 'M': {
			unsigned long ul;
			ctx.tag_min = ul = strtoul(isc_commandline_argument,
						   &endp, 10);
			if (*endp != ':' || ul > 0xffff) {
				fatal("-M range invalid");
			}
			ctx.tag_max = ul = strtoul(endp + 1, &endp, 10);
			if (*endp != '\0' || ul > 0xffff ||
			    ctx.tag_max <= ctx.tag_min)
			{
				fatal("-M range invalid");
			}
			break;
		}
		case 'm':
			break;
		case 'p':
			fatal("The -p option has been deprecated.");
			break;
		case 'q':
			ctx.quiet = true;
			break;
		case 'r':
			fatal("The -r option has been deprecated.\n"
			      "System random data is always used.\n");
			break;
		case 's':
			fatal("The -s option has been deprecated.");
			break;
		case 'T':
			if (strcasecmp(isc_commandline_argument, "KEY") == 0) {
				ctx.options |= DST_TYPE_KEY;
			} else if (strcasecmp(isc_commandline_argument,
					      "DNSKEY") == 0)
			{
				/* default behavior */
			} else {
				fatal("unknown type '%s'",
				      isc_commandline_argument);
			}
			break;
		case 't':
			fatal("The -t option has been deprecated.");
			break;
		case 'v':
			endp = NULL;
			verbose = strtol(isc_commandline_argument, &endp, 0);
			if (*endp != '\0') {
				fatal("-v must be followed by a number");
			}
			break;
		case 'G':
			ctx.genonly = true;
			break;
		case 'P':
			/* -Psync ? */
			if (isoptarg("sync", argv, usage)) {
				if (ctx.setsyncadd) {
					fatal("-P sync specified more than "
					      "once");
				}

				ctx.syncadd = strtotime(
					isc_commandline_argument, ctx.now,
					ctx.now, &ctx.setsyncadd);
				break;
			}
			(void)isoptarg("dnskey", argv, usage);
			if (ctx.setpub || ctx.unsetpub) {
				fatal("-P specified more than once");
			}

			ctx.publish = strtotime(isc_commandline_argument,
						ctx.now, ctx.now, &ctx.setpub);
			ctx.unsetpub = !ctx.setpub;
			break;
		case 'A':
			if (ctx.setact || ctx.unsetact) {
				fatal("-A specified more than once");
			}

			ctx.activate = strtotime(isc_commandline_argument,
						 ctx.now, ctx.now, &ctx.setact);
			ctx.unsetact = !ctx.setact;
			break;
		case 'R':
			if (ctx.setrev || ctx.unsetrev) {
				fatal("-R specified more than once");
			}

			ctx.revokekey = strtotime(isc_commandline_argument,
						  ctx.now, ctx.now,
						  &ctx.setrev);
			ctx.unsetrev = !ctx.setrev;
			break;
		case 'I':
			if (ctx.setinact || ctx.unsetinact) {
				fatal("-I specified more than once");
			}

			ctx.inactive = strtotime(isc_commandline_argument,
						 ctx.now, ctx.now,
						 &ctx.setinact);
			ctx.unsetinact = !ctx.setinact;
			break;
		case 'D':
			/* -Dsync ? */
			if (isoptarg("sync", argv, usage)) {
				if (ctx.setsyncdel) {
					fatal("-D sync specified more than "
					      "once");
				}

				ctx.syncdel = strtotime(
					isc_commandline_argument, ctx.now,
					ctx.now, &ctx.setsyncdel);
				break;
			}
			(void)isoptarg("dnskey", argv, usage);
			if (ctx.setdel || ctx.unsetdel) {
				fatal("-D specified more than once");
			}

			ctx.deltime = strtotime(isc_commandline_argument,
						ctx.now, ctx.now, &ctx.setdel);
			ctx.unsetdel = !ctx.setdel;
			break;
		case 'S':
			ctx.predecessor = isc_commandline_argument;
			break;
		case 'i':
			ctx.prepub = strtottl(isc_commandline_argument);
			break;
		case 'F':
			if (isc_crypto_fips_enable() != ISC_R_SUCCESS) {
				fatal("setting FIPS mode failed");
			}
			break;
		case '?':
			if (isc_commandline_option != '?') {
				fprintf(stderr, "%s: invalid argument -%c\n",
					isc_commandline_progname,
					isc_commandline_option);
			}
			/* Does not return. */
			usage(EXIT_FAILURE);

		case 'h':
			/* Does not return. */
			usage(EXIT_SUCCESS);

		case 'V':
			/* Does not return. */
			version(isc_commandline_progname);

		default:
			fprintf(stderr, "%s: unhandled option -%c\n",
				isc_commandline_progname,
				isc_commandline_option);
			exit(EXIT_FAILURE);
		}
	}

	if (!isatty(0)) {
		ctx.quiet = true;
	}

	/*
	 * The DST subsystem will set FIPS mode if requested at build time.
	 * The minimum sizes are both raised to 2048.
	 */
	if (isc_crypto_fips_mode()) {
		min_rsa = min_dh = 2048;
	}

	setup_logging();

	ctx.rdclass = strtoclass(classname);

	if (ctx.configfile == NULL || ctx.configfile[0] == '\0') {
		ctx.configfile = NAMED_CONFFILE;
	}

	if (ctx.predecessor == NULL) {
		if (argc < isc_commandline_index + 1) {
			fatal("the key name was not specified");
		}
		if (argc > isc_commandline_index + 1) {
			fatal("extraneous arguments");
		}
	}

	if (ctx.predecessor == NULL && ctx.policy == NULL) {
		if (algname == NULL) {
			fatal("no algorithm specified");
		}
		r.base = algname;
		r.length = strlen(algname);
		result = dst_algorithm_fromtext(&ctx.alg, &r);
		if (result != ISC_R_SUCCESS) {
			fatal("unknown algorithm %s", algname);
		}
		if (!dst_algorithm_supported(ctx.alg)) {
			fatal("unsupported algorithm: %s", algname);
		}
	}

	if (ctx.policy != NULL) {
		if (ctx.predecessor != NULL) {
			fatal("-k and -S cannot be used together");
		}
		if (ctx.setttl) {
			fatal("-k and -L cannot be used together");
		}
		if (ctx.prepub > 0) {
			fatal("-k and -i cannot be used together");
		}
		if (ctx.size != -1) {
			fatal("-k and -b cannot be used together");
		}
		if (ctx.wantrev) {
			fatal("-k and -fR cannot be used together");
		}
		if ((ctx.options & DST_TYPE_KEY) != 0) {
			fatal("-k and -T KEY cannot be used together");
		}
		if (ctx.use_nsec3) {
			fatal("-k and -3 cannot be used together");
		}

		ctx.options |= DST_TYPE_STATE;

		if (strcmp(ctx.policy, "default") == 0) {
			ctx.use_nsec3 = false;
			ctx.alg = DST_ALG_ECDSA256;
			ctx.size = 0;
			ctx.ttl = 3600;
			ctx.setttl = true;
			ctx.ksk = true;
			ctx.zsk = true;
			ctx.lifetime = 0;
			ctx.tag_min = 0;
			ctx.tag_max = 0xffff;

			keygen(&ctx, argv[isc_commandline_index]);
		} else {
			cfg_obj_t *config = NULL;
			dns_kasp_t *kasp = NULL;

			if (cfg_parse_file(ctx.configfile, &cfg_type_namedconf,
					   0, &config) != ISC_R_SUCCESS)
			{
				fatal("unable to load dnssec-policy '%s' from "
				      "'%s'",
				      ctx.policy, ctx.configfile);
			}

			kasp_from_conf(config, isc_g_mctx, ctx.policy,
				       ctx.directory, &kasp);
			if (kasp == NULL) {
				fatal("failed to load dnssec-policy '%s'",
				      ctx.policy);
			}
			if (ISC_LIST_EMPTY(dns_kasp_keys(kasp))) {
				fatal("dnssec-policy '%s' has no keys "
				      "configured",
				      ctx.policy);
			}

			ctx.ttl = dns_kasp_dnskeyttl(kasp);
			ctx.setttl = true;

			ISC_LIST_FOREACH(dns_kasp_keys(kasp), kaspkey, link) {
				ctx.use_nsec3 = false;
				ctx.alg = dns_kasp_key_algorithm(kaspkey);
				ctx.size = dns_kasp_key_size(kaspkey);
				ctx.ksk = dns_kasp_key_ksk(kaspkey);
				ctx.zsk = dns_kasp_key_zsk(kaspkey);
				ctx.lifetime = dns_kasp_key_lifetime(kaspkey);
				ctx.keystore = dns_kasp_key_keystore(kaspkey);
				if (ctx.keystore != NULL) {
					check_keystore_options(&ctx);
				}
				ctx.tag_min = dns_kasp_key_tagmin(kaspkey);
				ctx.tag_max = dns_kasp_key_tagmax(kaspkey);
				if ((ctx.ksk && !ctx.wantksk && ctx.wantzsk) ||
				    (ctx.zsk && !ctx.wantzsk && ctx.wantksk))
				{
					continue;
				}
				keygen(&ctx, argv[isc_commandline_index]);
			}

			dns_kasp_detach(&kasp);
			cfg_obj_detach(&config);
		}
	} else {
		keygen(&ctx, argv[isc_commandline_index]);
	}

	if (verbose > 10) {
		isc_mem_stats(isc_g_mctx, stdout);
	}

	if (freeit != NULL) {
		free(freeit);
	}

	return 0;
}
