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Rename struct ${app}_config to plain cfg

All the structs are static and we need to reach into them many times.
Having a shorter name is more concise and results in less visual clutter.
It also avoids many overlong lines and we will be able to get rid of some
unfortunate line wrapping down the road.

Discussed with jsing

/* $OpenBSD: gendh.c,v 1.14 2023/03/06 14:32:06 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <openssl/opensslconf.h>

/* Until the key-gen callbacks are modified to use newer prototypes, we allow
 * deprecated functions for openssl-internal code */
#ifdef OPENSSL_NO_DEPRECATED
#undef OPENSSL_NO_DEPRECATED
#endif

#ifndef OPENSSL_NO_DH

#include <sys/types.h>
#include <sys/stat.h>

#include <limits.h>
#include <stdio.h>
#include <string.h>

#include "apps.h"

#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/x509.h>

#define DEFBITS	512

static int dh_cb(int p, int n, BN_GENCB *cb);

static struct {
	int g;
	char *outfile;
} cfg;

static const struct option gendh_options[] = {
	{
		.name = "2",
		.desc = "Generate DH parameters with a generator value of 2 "
		    "(default)",
		.type = OPTION_VALUE,
		.value = 2,
		.opt.value = &cfg.g,
	},
	{
		.name = "5",
		.desc = "Generate DH parameters with a generator value of 5",
		.type = OPTION_VALUE,
		.value = 5,
		.opt.value = &cfg.g,
	},
	{
		.name = "out",
		.argname = "file",
		.desc = "Output file (default stdout)",
		.type = OPTION_ARG,
		.opt.arg = &cfg.outfile,
	},
	{ NULL },
};

static void
gendh_usage(void)
{
	fprintf(stderr,
	    "usage: gendh [-2 | -5] [-out file] [numbits]\n\n");
	options_usage(gendh_options);
}

int
gendh_main(int argc, char **argv)
{
	BN_GENCB *cb = NULL;
	DH *dh = NULL;
	int ret = 1, numbits = DEFBITS;
	BIO *out = NULL;
	char *strbits = NULL;

	if (pledge("stdio cpath wpath rpath", NULL) == -1) {
		perror("pledge");
		exit(1);
	}

	if ((cb = BN_GENCB_new()) == NULL) {
		BIO_printf(bio_err, "Error allocating BN_GENCB object\n");
		goto end;
	}

	BN_GENCB_set(cb, dh_cb, bio_err);

	memset(&cfg, 0, sizeof(cfg));

	cfg.g = 2;

	if (options_parse(argc, argv, gendh_options, &strbits, NULL) != 0) {
		gendh_usage();
		goto end;
	}

	if (strbits != NULL) {
		const char *errstr;
		numbits = strtonum(strbits, 0, INT_MAX, &errstr);
		if (errstr) {
			fprintf(stderr, "Invalid number of bits: %s\n", errstr);
			goto end;
		}
	}

	out = BIO_new(BIO_s_file());
	if (out == NULL) {
		ERR_print_errors(bio_err);
		goto end;
	}
	if (cfg.outfile == NULL) {
		BIO_set_fp(out, stdout, BIO_NOCLOSE);
	} else {
		if (BIO_write_filename(out, cfg.outfile) <= 0) {
			perror(cfg.outfile);
			goto end;
		}
	}

	BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime,"
	    " generator %d\n", numbits, cfg.g);
	BIO_printf(bio_err, "This is going to take a long time\n");

	if (((dh = DH_new()) == NULL) ||
	    !DH_generate_parameters_ex(dh, numbits, cfg.g, cb))
		goto end;

	if (!PEM_write_bio_DHparams(out, dh))
		goto end;
	ret = 0;
 end:
	if (ret != 0)
		ERR_print_errors(bio_err);
	BIO_free_all(out);
	BN_GENCB_free(cb);
	DH_free(dh);

	return (ret);
}

static int
dh_cb(int p, int n, BN_GENCB *cb)
{
	char c = '*';

	if (p == 0)
		c = '.';
	if (p == 1)
		c = '+';
	if (p == 2)
		c = '*';
	if (p == 3)
		c = '\n';
	BIO_write(BN_GENCB_get_arg(cb), &c, 1);
	(void) BIO_flush(BN_GENCB_get_arg(cb));
	return 1;
}
#endif