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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: ciphers.c,v 1.18 2023/03/06 14:32:05 tb Exp $ */
/*
 * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
 *
 * Permission to use, copy, modify, and 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
 */

#include <stdio.h>
#include <stdlib.h>

#include <openssl/err.h>
#include <openssl/ssl.h>

#include "apps.h"
#include "progs.h"

static struct {
	int usage;
	int use_supported;
	int verbose;
	int version;
} cfg;

static const struct option ciphers_options[] = {
	{
		.name = "h",
		.type = OPTION_FLAG,
		.opt.flag = &cfg.usage,
	},
	{
		.name = "?",
		.type = OPTION_FLAG,
		.opt.flag = &cfg.usage,
	},
	{
		.name = "s",
		.desc = "Only list ciphers that are supported by the TLS method",
		.type = OPTION_FLAG,
		.opt.flag = &cfg.use_supported,
	},
	{
		.name = "tls1",
		.desc = "Use TLS protocol version 1",
		.type = OPTION_VALUE,
		.opt.value = &cfg.version,
		.value = TLS1_VERSION,
	},
	{
		.name = "tls1_1",
		.desc = "Use TLS protocol version 1.1",
		.type = OPTION_VALUE,
		.opt.value = &cfg.version,
		.value = TLS1_1_VERSION,
	},
	{
		.name = "tls1_2",
		.desc = "Use TLS protocol version 1.2",
		.type = OPTION_VALUE,
		.opt.value = &cfg.version,
		.value = TLS1_2_VERSION,
	},
	{
		.name = "tls1_3",
		.desc = "Use TLS protocol version 1.3",
		.type = OPTION_VALUE,
		.opt.value = &cfg.version,
		.value = TLS1_3_VERSION,
	},
	{
		.name = "v",
		.desc = "Provide cipher listing",
		.type = OPTION_VALUE,
		.opt.value = &cfg.verbose,
		.value = 1,
	},
	{
		.name = "V",
		.desc = "Provide cipher listing with cipher suite values",
		.type = OPTION_VALUE,
		.opt.value = &cfg.verbose,
		.value = 2,
	},
	{ NULL },
};

static void
ciphers_usage(void)
{
	fprintf(stderr, "usage: ciphers [-hsVv] [-tls1] [-tls1_1] [-tls1_2] "
	    "[-tls1_3] [cipherlist]\n");
	options_usage(ciphers_options);
}

int
ciphers_main(int argc, char **argv)
{
	char *cipherlist = NULL;
	STACK_OF(SSL_CIPHER) *ciphers;
	STACK_OF(SSL_CIPHER) *supported_ciphers = NULL;
	const SSL_CIPHER *cipher;
	SSL_CTX *ssl_ctx = NULL;
	SSL *ssl = NULL;
	uint16_t value;
	int i, rv = 0;
	char *desc;

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

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

	if (options_parse(argc, argv, ciphers_options, &cipherlist,
	    NULL) != 0) {
		ciphers_usage();
		return (1);
	}

	if (cfg.usage) {
		ciphers_usage();
		return (1);
	}

	if ((ssl_ctx = SSL_CTX_new(TLS_method())) == NULL)
		goto err;

	if (cfg.version != 0) {
		if (!SSL_CTX_set_min_proto_version(ssl_ctx,
		    cfg.version))
			goto err;
		if (!SSL_CTX_set_max_proto_version(ssl_ctx,
		    cfg.version))
			goto err;
	}

	if (cipherlist != NULL) {
		if (SSL_CTX_set_cipher_list(ssl_ctx, cipherlist) == 0)
			goto err;
	}

	if ((ssl = SSL_new(ssl_ctx)) == NULL)
		goto err;

	if (cfg.use_supported) {
		if ((supported_ciphers =
		    SSL_get1_supported_ciphers(ssl)) == NULL)
			goto err;
		ciphers = supported_ciphers;
	} else {
		if ((ciphers = SSL_get_ciphers(ssl)) == NULL)
			goto err;
	}

	for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
		cipher = sk_SSL_CIPHER_value(ciphers, i);
		if (cfg.verbose == 0) {
			fprintf(stdout, "%s%s", (i ? ":" : ""),
			    SSL_CIPHER_get_name(cipher));
			continue;
		}
		if (cfg.verbose > 1) {
			value = SSL_CIPHER_get_value(cipher);
			fprintf(stdout, "%-*s0x%02X,0x%02X - ", 10, "",
			    ((value >> 8) & 0xff), (value & 0xff));
		}
		desc = SSL_CIPHER_description(cipher, NULL, 0);
		if (strcmp(desc, "OPENSSL_malloc Error") == 0) {
			fprintf(stderr, "out of memory\n");
			goto err;
		}
		fprintf(stdout, "%s", desc);
		free(desc);
	}
	if (cfg.verbose == 0)
		fprintf(stdout, "\n");

	goto done;

 err:
	ERR_print_errors_fp(stderr);
	rv = 1;

 done:
	sk_SSL_CIPHER_free(supported_ciphers);
	SSL_CTX_free(ssl_ctx);
	SSL_free(ssl);

	return (rv);
}