/*	$OpenBSD: map_parser.c,v 1.3 2010/04/27 09:49:23 gilles Exp $	*/

/*
 * Copyright (c) 2010 Gilles Chehade <gilles@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 <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/param.h>
#include <sys/socket.h>

#include <ctype.h>
#include <db.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "smtpd.h"

struct map_parser *map_parser_lookup(enum map_kind);

void *map_parse_secret(char *, char *, size_t);
void *map_parse_alias(char *, char *, size_t);
void *map_parse_virtual(char *, char *, size_t);

struct map_parser map_parsers[] = {
	{ K_NONE,	NULL },
	{ K_ALIAS,	map_parse_alias },
	{ K_VIRTUAL,	map_parse_virtual },
	{ K_SECRET,	map_parse_secret }
};

struct map_parser *
map_parser_lookup(enum map_kind kind)
{
	u_int8_t i;

	for (i = 0; i < nitems(map_parsers); ++i)
		if (map_parsers[i].kind == kind)
			break;

	if (i == nitems(map_parsers))
		fatalx("invalid map kind");

	return &map_parsers[i];
}

void *
map_parse_secret(char *key, char *line, size_t len)
{
	struct map_secret *map_secret = NULL;
	char *p;

	/* credentials are stored as user:password */
	if (len < 3)
		return NULL;

	/* too big to fit in a smtp session line */
	if (len >= MAX_LINE_SIZE)
		return NULL;

	p = strchr(line, ':');
	if (p == NULL)
		return NULL;

	if (p == line || p == line + len - 1)
		return NULL;
	*p++ = '\0';

	map_secret = calloc(1, sizeof(struct map_secret));
	if (map_secret == NULL)
		fatalx("calloc");

	if (strlcpy(map_secret->username, line,
		sizeof(map_secret->username)) >=
	    sizeof(map_secret->username))
		goto err;

	if (strlcpy(map_secret->password, p,
		sizeof(map_secret->password)) >=
	    sizeof(map_secret->password))
		goto err;

	return map_secret;

err:
	free(map_secret);
	return NULL;
}

void *
map_parse_alias(char *key, char *line, size_t len)
{
	char	       	*subrcpt;
	char	       	*endp;
	struct map_alias	*map_alias = NULL;
	struct expandnode	 expnode;

	map_alias = calloc(1, sizeof(struct map_alias));
	if (map_alias == NULL)
		fatalx("calloc");

	while ((subrcpt = strsep(&line, ",")) != NULL) {
		/* subrcpt: strip initial whitespace. */
		while (isspace((int)*subrcpt))
			++subrcpt;
		if (*subrcpt == '\0')
			goto error;

		/* subrcpt: strip trailing whitespace. */
		endp = subrcpt + strlen(subrcpt) - 1;
		while (subrcpt < endp && isspace((int)*endp))
			*endp-- = '\0';

		bzero(&expnode, sizeof (struct expandnode));
		if (! alias_parse(&expnode, subrcpt))
			goto error;

		expandtree_increment_node(&map_alias->expandtree, &expnode);
		map_alias->nbnodes++;
	}

	return map_alias;

error:
	/* free elements in map_alias->expandtree */
	expandtree_free_nodes(&map_alias->expandtree);
	free(map_alias);
	return NULL;
}

void *
map_parse_virtual(char *key, char *line, size_t len)
{
	char	       	*subrcpt;
	char	       	*endp;
	struct map_virtual	*map_virtual = NULL;
	struct expandnode	 expnode;

	map_virtual = calloc(1, sizeof(struct map_virtual));
	if (map_virtual == NULL)
		fatalx("calloc");

	/* domain key, discard value */
	if (strchr(key, '@') == NULL)
		return map_virtual;

	while ((subrcpt = strsep(&line, ",")) != NULL) {
		/* subrcpt: strip initial whitespace. */
		while (isspace((int)*subrcpt))
			++subrcpt;
		if (*subrcpt == '\0')
			goto error;

		/* subrcpt: strip trailing whitespace. */
		endp = subrcpt + strlen(subrcpt) - 1;
		while (subrcpt < endp && isspace((int)*endp))
			*endp-- = '\0';

		bzero(&expnode, sizeof (struct expandnode));
		if (! alias_parse(&expnode, subrcpt))
			goto error;

		expandtree_increment_node(&map_virtual->expandtree, &expnode);
		map_virtual->nbnodes++;
	}

	return map_virtual;

error:
	/* free elements in map_virtual->expandtree */
	expandtree_free_nodes(&map_virtual->expandtree);
	free(map_virtual);
	return NULL;
}