/*
 * kmod-insmod - insert modules into linux kernel using libkmod.
 *
 * Copyright (C) 2011  ProFUSION embedded systems
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <errno.h>
#include <string.h>
#include "libkmod.h"


static const char cmdopts_s[] = "psfVh";
static const struct option cmdopts[] = {
	{"version", no_argument, 0, 'V'},
	{"help", no_argument, 0, 'h'},
	{NULL, 0, 0, 0}
};

static void help(const char *progname)
{
	fprintf(stderr,
		"Usage:\n"
		"\t%s [options] filename [args]\n"
		"Options:\n"
		"\t-V, --version     show version\n"
		"\t-h, --help        show this help\n",
		progname);
}

static const char *mod_strerror(int err)
{
	switch (err) {
	case ENOEXEC:
		return "Invalid module format";
	case ENOENT:
		return "Unknown symbol in module";
	case ESRCH:
		return "Module has wrong symbol version";
	case EINVAL:
		return "Invalid parameters";
	default:
		return strerror(err);
	}
}

int main(int argc, char *argv[])
{
	struct kmod_ctx *ctx;
	struct kmod_module *mod;
	const char *filename;
	char *opts = NULL;
	size_t optslen = 0;
	int i, err;
	const char *null_config = NULL;

	for (;;) {
		int c, idx = 0;
		c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
		if (c == -1)
			break;
		switch (c) {
		case 'p':
		case 's':
		case 'f':
			/* ignored, for compatibility only */
			break;
		case 'h':
			help(argv[0]);
			return EXIT_SUCCESS;
		case 'V':
			puts(PACKAGE " version " VERSION);
			return EXIT_SUCCESS;
		case '?':
			return EXIT_FAILURE;
		default:
			fprintf(stderr,
				"Error: unexpected getopt_long() value '%c'.\n",
				c);
			return EXIT_FAILURE;
		}
	}

	if (optind >= argc) {
		fprintf(stderr, "Error: missing filename.\n");
		return EXIT_FAILURE;
	}

	filename = argv[optind];
	if (strcmp(filename, "-") == 0) {
		fputs("Error: this tool does not support loading from stdin!\n",
		      stderr);
		return EXIT_FAILURE;
	}

	for (i = optind + 1; i < argc; i++) {
		size_t len = strlen(argv[i]);
		void *tmp = realloc(opts, optslen + len + 2);
		if (tmp == NULL) {
			fputs("Error: out of memory\n", stderr);
			free(opts);
			return EXIT_FAILURE;
		}
		opts = tmp;
		if (optslen > 0) {
			opts[optslen] = ' ';
			optslen++;
		}
		memcpy(opts + optslen, argv[i], len);
		optslen += len;
		opts[optslen] = '\0';
	}

	ctx = kmod_new(NULL, &null_config);
	if (!ctx) {
		fputs("Error: kmod_new() failed!\n", stderr);
		free(opts);
		return EXIT_FAILURE;
	}

	err = kmod_module_new_from_path(ctx, filename, &mod);
	if (err < 0) {
		fprintf(stderr, "Error: could not load module %s: %s\n",
			filename, strerror(-err));
		goto end;
	}

	err = kmod_module_insert_module(mod, 0, opts);
	if (err < 0) {
		fprintf(stderr, "Error: could not insert module %s: %s\n",
			filename, mod_strerror(-err));
	}
	kmod_module_unref(mod);

end:
	kmod_unref(ctx);
	free(opts);
	return err >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}