luksrku/argparse_server.c

/*
 *   This file was AUTO-GENERATED by pypgmopts.
 *
 *   https://github.com/johndoe31415/pypgmopts
 *
 *   Do not edit it by hand, your changes will be overwritten.
 *
 *   Generated at: 2019-10-25 20:39:15
 */

#include <stdint.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <stdarg.h>
#include <string.h>
#include "argparse_server.h"

static enum argparse_server_option_t last_parsed_option;
static char last_error_message[256];
static const char *option_texts[] = {
	[ARG_SERVER_PORT] = "-p / --port",
	[ARG_SERVER_SILENT] = "-s / --silent",
	[ARG_SERVER_VERBOSE] = "-v / --verbose",
	[ARG_SERVER_FILENAME] = "filename",
};

enum argparse_server_option_internal_t {
	ARG_SERVER_PORT_SHORT = 'p',
	ARG_SERVER_SILENT_SHORT = 's',
	ARG_SERVER_VERBOSE_SHORT = 'v',
	ARG_SERVER_PORT_LONG = 1000,
	ARG_SERVER_SILENT_LONG = 1001,
	ARG_SERVER_VERBOSE_LONG = 1002,
	ARG_SERVER_FILENAME_LONG = 1003,
};

static void errmsg_callback(const char *errmsg, ...) {
	va_list ap;
	va_start(ap, errmsg);
	vsnprintf(last_error_message, sizeof(last_error_message), errmsg, ap);
	va_end(ap);
}

static void errmsg_option_callback(enum argparse_server_option_t error_option, const char *errmsg, ...) {
	last_parsed_option = error_option;

	va_list ap;
	va_start(ap, errmsg);
	vsnprintf(last_error_message, sizeof(last_error_message), errmsg, ap);
	va_end(ap);
}

bool argparse_server_parse(int argc, char **argv, argparse_server_callback_t argument_callback, argparse_server_plausibilization_callback_t plausibilization_callback) {
	last_parsed_option = ARGPARSE_SERVER_NO_OPTION;
	const char *short_options = "p:sv";
	struct option long_options[] = {
		{ "port",                             required_argument, 0, ARG_SERVER_PORT_LONG },
		{ "silent",                           no_argument, 0, ARG_SERVER_SILENT_LONG },
		{ "verbose",                          no_argument, 0, ARG_SERVER_VERBOSE_LONG },
		{ "filename",                         required_argument, 0, ARG_SERVER_FILENAME_LONG },
		{ 0 }
	};

	while (true) {
		int optval = getopt_long(argc, argv, short_options, long_options, NULL);
		if (optval == -1) {
			break;
		}
		last_error_message[0] = 0;
		enum argparse_server_option_internal_t arg = (enum argparse_server_option_internal_t)optval;
		switch (arg) {
			case ARG_SERVER_PORT_SHORT:
			case ARG_SERVER_PORT_LONG:
				last_parsed_option = ARG_SERVER_PORT;
				if (!argument_callback(ARG_SERVER_PORT, optarg, errmsg_callback)) {
					return false;
				}
				break;

			case ARG_SERVER_SILENT_SHORT:
			case ARG_SERVER_SILENT_LONG:
				last_parsed_option = ARG_SERVER_SILENT;
				if (!argument_callback(ARG_SERVER_SILENT, optarg, errmsg_callback)) {
					return false;
				}
				break;

			case ARG_SERVER_VERBOSE_SHORT:
			case ARG_SERVER_VERBOSE_LONG:
				last_parsed_option = ARG_SERVER_VERBOSE;
				if (!argument_callback(ARG_SERVER_VERBOSE, optarg, errmsg_callback)) {
					return false;
				}
				break;

			default:
				last_parsed_option = ARGPARSE_SERVER_NO_OPTION;
				errmsg_callback("unrecognized option supplied");
				return false;
		}
	}

	const int positional_argument_cnt = argc - optind;
	last_parsed_option = ARGPARSE_SERVER_POSITIONAL_ARG;
	if (positional_argument_cnt != 1) {
		errmsg_callback("expected exactly 1 positional argument, but %d given.", positional_argument_cnt);
		return false;
	}

	int positional_index = optind;
	last_parsed_option = ARG_SERVER_FILENAME;
	if (!argument_callback(ARG_SERVER_FILENAME, argv[positional_index++], errmsg_callback)) {
		return false;
	}

	if (plausibilization_callback) {
		if (!plausibilization_callback(errmsg_option_callback)) {
			return false;
		}
	}
	return true;
}

void argparse_server_show_syntax(void) {
	fprintf(stderr, "usage: luksrku server [-p port] [-s] [-v] filename\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "Starts a luksrku key server.\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "positional arguments:\n");
	fprintf(stderr, "  filename              Database file to load keys from.\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "optional arguments:\n");
	fprintf(stderr, "  -p port, --port port  Port that is used for both UDP and TCP communication.\n");
	fprintf(stderr, "                        Defaults to 23170.\n");
	fprintf(stderr, "  -s, --silent          Do not answer UDP queries for clients trying to find a\n");
	fprintf(stderr, "                        key server, only serve key database using TCP.\n");
	fprintf(stderr, "  -v, --verbose         Increase verbosity. Can be specified multiple times.\n");
}

void argparse_server_parse_or_quit(int argc, char **argv, argparse_server_callback_t argument_callback, argparse_server_plausibilization_callback_t plausibilization_callback) {
	if (!argparse_server_parse(argc, argv, argument_callback, plausibilization_callback)) {
		if (last_parsed_option > ARGPARSE_SERVER_POSITIONAL_ARG) {
			if (last_error_message[0]) {
				fprintf(stderr, "luksrku server: error parsing argument %s -- %s\n", option_texts[last_parsed_option], last_error_message);
			} else {
				fprintf(stderr, "luksrku server: error parsing argument %s -- no details available\n", option_texts[last_parsed_option]);
			}
		} else if (last_parsed_option == ARGPARSE_SERVER_POSITIONAL_ARG) {
			fprintf(stderr, "luksrku server: error parsing optional arguments -- %s\n", last_error_message);
		}
		argparse_server_show_syntax();
		exit(EXIT_FAILURE);
	}
}

#ifdef __ARGPARSE_MAIN__
/*   gcc -D __ARGPARSE_MAIN__ -O2 -Wall -o argparse argparse_server.c
*/

static const char *option_enum_to_str(enum argparse_server_option_t option) {
	switch (option) {
		case ARG_SERVER_PORT: return "ARG_SERVER_PORT";
		case ARG_SERVER_SILENT: return "ARG_SERVER_SILENT";
		case ARG_SERVER_VERBOSE: return "ARG_SERVER_VERBOSE";
		case ARG_SERVER_FILENAME: return "ARG_SERVER_FILENAME";
	}
	return "UNKNOWN";
}

bool arg_print_callback(enum argparse_server_option_t option, const char *value, argparse_server_errmsg_callback_t errmsg_callback) {
	fprintf(stderr, "%s = \"%s\"\n", option_enum_to_str(option), value);
	return true;
}

int main(int argc, char **argv) {
	argparse_server_parse_or_quit(argc, argv, arg_print_callback, NULL);
	return 0;
}
#endif