GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/npppctl/parser.c Lines: 0 89 0.0 %
Date: 2017-11-13 Branches: 0 80 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: parser.c,v 1.3 2015/01/19 01:48:57 deraadt Exp $	*/
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/* This file is derived from OpenBSD:src/usr.sbin/ikectl/parser.c 1.9 */
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/*
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 * Copyright (c) 2010 Reyk Floeter <reyk@vantronix.net>
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 * Copyright (c) 2004 Esben Norby <norby@openbsd.org>
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 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 */
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "parser.h"
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enum token_type {
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	NOTOKEN,
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	ENDTOKEN,
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	KEYWORD,
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	PPP_ID,
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	ADDRESS,
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	INTERFACE,
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	PROTOCOL,
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	REALM,
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	USERNAME
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};
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struct token {
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	enum token_type		 type;
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	const char		*keyword;
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	int			 value;
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	const struct token	*next;
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};
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static struct parse_result res;
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static const struct token t_main[];
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static const struct token t_session[];
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static const struct token t_clear[];
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static const struct token t_monitor[];
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static const struct token t_filter[];
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static const struct token t_ppp_id[];
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static const struct token t_address[];
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static const struct token t_interface[];
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static const struct token t_protocol[];
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static const struct token t_realm[];
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static const struct token t_username[];
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static const struct token t_main[] = {
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	{ KEYWORD,	"session",	NONE,		t_session },
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	{ KEYWORD,	"clear",	NONE,		t_clear },
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	{ KEYWORD,	"monitor",	NONE,		t_monitor },
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	{ ENDTOKEN,	"",		NONE,		NULL }
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};
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static const struct token t_session[] = {
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	{ KEYWORD,	"brief",	SESSION_BRIEF,	NULL },
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	{ KEYWORD,	"packets",	SESSION_PKTS,	NULL },
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	{ KEYWORD,	"all",		SESSION_ALL,	t_filter },
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	{ ENDTOKEN,	"",		NONE,		NULL }
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};
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static const struct token t_clear[] = {
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	{ KEYWORD,	"all",		CLEAR_SESSION,	NULL },
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	{ KEYWORD,	"ppp-id",	CLEAR_SESSION,	t_ppp_id },
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	{ KEYWORD,	"address",	CLEAR_SESSION,	t_address },
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	{ KEYWORD,	"interface",	CLEAR_SESSION,	t_interface },
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	{ KEYWORD,	"protocol",	CLEAR_SESSION,	t_protocol },
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	{ KEYWORD,	"realm",	CLEAR_SESSION,	t_realm },
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	{ KEYWORD,	"username",	CLEAR_SESSION,	t_username },
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	{ ENDTOKEN,	"",		CLEAR_SESSION,	NULL }
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};
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static const struct token t_monitor[] = {
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	{ KEYWORD,	"all",		MONITOR_SESSION,	NULL },
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	{ KEYWORD,	"ppp-id",	MONITOR_SESSION,	t_ppp_id },
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	{ KEYWORD,	"address",	MONITOR_SESSION,	t_address },
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	{ KEYWORD,	"interface",	MONITOR_SESSION,	t_interface },
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	{ KEYWORD,	"protocol",	MONITOR_SESSION,	t_protocol },
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	{ KEYWORD,	"realm",	MONITOR_SESSION,	t_realm },
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	{ KEYWORD,	"username",	MONITOR_SESSION,	t_username },
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	{ ENDTOKEN,	"",		MONITOR_SESSION,	NULL }
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};
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static const struct token t_filter[] = {
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	{ NOTOKEN,	"",		NONE,		NULL },
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	{ KEYWORD,	"ppp-id",	NONE,		t_ppp_id },
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	{ KEYWORD,	"address",	NONE,		t_address },
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	{ KEYWORD,	"interface",	NONE,		t_interface },
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	{ KEYWORD,	"protocol",	NONE,		t_protocol },
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	{ KEYWORD,	"realm",	NONE,		t_realm },
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	{ KEYWORD,	"username",	NONE,		t_username },
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	{ ENDTOKEN,	"",		NONE,		NULL }
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};
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static const struct token t_ppp_id[] = {
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	{ PPP_ID,	"",		NONE,			t_filter },
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	{ ENDTOKEN,	"",		NONE,			NULL }
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};
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static const struct token t_address[] = {
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	{ ADDRESS,	"",		NONE,			t_filter },
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	{ ENDTOKEN,	"",		NONE,			NULL }
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};
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static const struct token t_interface[] = {
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	{ INTERFACE,	"",		NONE,			t_filter },
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	{ ENDTOKEN,	"",		NONE,			NULL }
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};
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static const struct token t_protocol[] = {
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	{ PROTOCOL,	"",		NONE,			t_filter },
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	{ ENDTOKEN,	"",		NONE,			NULL }
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};
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static const struct token t_realm[] = {
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	{ REALM,	"",		NONE,			t_filter },
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	{ ENDTOKEN,	"",		NONE,			NULL }
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};
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static const struct token t_username[] = {
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	{ USERNAME,	"",		NONE,			t_filter },
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	{ ENDTOKEN,	"",		NONE,			NULL }
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};
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static const struct token	*match_token(char *, const struct token []);
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static void			 show_valid_args(const struct token []);
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struct parse_result *
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parse(int argc, char *argv[])
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{
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	const struct token	*table = t_main;
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	const struct token	*match;
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	bzero(&res, sizeof(res));
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	while (argc >= 0) {
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		if ((match = match_token(argv[0], table)) == NULL) {
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			fprintf(stderr, "valid commands/args:\n");
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			show_valid_args(table);
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			return (NULL);
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		}
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		argc--;
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		argv++;
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		if (match->type == NOTOKEN || match->next == NULL)
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			break;
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		table = match->next;
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	}
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	if (argc > 0) {
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		fprintf(stderr, "superfluous argument: %s\n", argv[0]);
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		return (NULL);
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	}
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	return (&res);
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}
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static const struct token *
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match_token(char *word, const struct token table[])
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{
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	u_int			 i, match = 0;
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	unsigned long int	 ulval;
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	const struct token	*t = NULL;
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	char			*ep;
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	for (i = 0; table[i].type != ENDTOKEN; i++) {
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		switch (table[i].type) {
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		case NOTOKEN:
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			if (word == NULL || strlen(word) == 0) {
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				match++;
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				t = &table[i];
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			}
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			break;
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		case KEYWORD:
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			if (word != NULL && strncmp(word, table[i].keyword,
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			    strlen(word)) == 0) {
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				match++;
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				t = &table[i];
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				if (t->value)
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					res.action = t->value;
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			}
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			break;
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		case PPP_ID:
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			if (word == NULL)
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				break;
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			errno = 0;
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			ulval = strtoul(word, &ep, 10);
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			if (isdigit((unsigned char)*word) && *ep == '\0' &&
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			    !(errno == ERANGE && ulval == ULONG_MAX)) {
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				res.ppp_id = ulval;
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				res.has_ppp_id = 1;
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				match++;
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				t = &table[i];
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			}
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			break;
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		case ADDRESS:
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		    {
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			struct sockaddr_in sin4 = {
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				.sin_family = AF_INET,
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				.sin_len = sizeof(struct sockaddr_in)
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			};
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			struct sockaddr_in6 sin6 = {
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				.sin6_family = AF_INET6,
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				.sin6_len = sizeof(struct sockaddr_in6)
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			};
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			if (word == NULL)
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				break;
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			if (inet_pton(AF_INET, word, &sin4.sin_addr) == 1)
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				memcpy(&res.address, &sin4, sin4.sin_len);
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			else
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			if (inet_pton(AF_INET6, word, &sin6.sin6_addr) == 1)
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				memcpy(&res.address, &sin6, sin6.sin6_len);
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			else
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				break;
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			match++;
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			t = &table[i];
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		    }
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			break;
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		case INTERFACE:
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			if (word == NULL)
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				break;
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			res.interface = word;
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			match++;
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			t = &table[i];
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			break;
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		case PROTOCOL:
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			if (word == NULL)
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				break;
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			if ((res.protocol = parse_protocol(word)) ==
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			    PROTO_UNSPEC)
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				break;
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			match++;
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			t = &table[i];
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			break;
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		case REALM:
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			if (word == NULL)
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				break;
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			res.realm = word;
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			match++;
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			t = &table[i];
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			break;
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		case USERNAME:
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			if (word == NULL)
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				break;
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			res.username = word;
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			match++;
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			t = &table[i];
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			break;
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		case ENDTOKEN:
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			break;
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		}
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	}
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	if (match != 1) {
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		if (word == NULL)
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			fprintf(stderr, "missing argument:\n");
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		else if (match > 1)
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			fprintf(stderr, "ambiguous argument: %s\n", word);
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		else if (match < 1)
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			fprintf(stderr, "unknown argument: %s\n", word);
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		return (NULL);
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	}
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	return (t);
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}
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static void
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show_valid_args(const struct token table[])
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{
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	int	i;
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	for (i = 0; table[i].type != ENDTOKEN; i++) {
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		switch (table[i].type) {
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		case NOTOKEN:
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			fprintf(stderr, "  <cr>\n");
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			break;
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		case KEYWORD:
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			fprintf(stderr, "  %s\n", table[i].keyword);
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			break;
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		case PPP_ID:
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			fprintf(stderr, "  <ppp-id>\n");
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			break;
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		case ADDRESS:
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			fprintf(stderr, "  <address>\n");
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			break;
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		case INTERFACE:
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			fprintf(stderr, "  <interface>\n");
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			break;
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		case PROTOCOL:
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			fprintf(stderr, "  [ pppoe | l2tp | pptp | sstp ]\n");
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			break;
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		case REALM:
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			fprintf(stderr, "  <realm>\n");
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			break;
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		case USERNAME:
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			fprintf(stderr, "  <username>\n");
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			break;
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		case ENDTOKEN:
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			break;
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		}
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	}
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}
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enum protocol
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parse_protocol(const char *str)
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{
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	return
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	    (strcasecmp(str, "PPTP" ) == 0)? PPTP  :
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	    (strcasecmp(str, "L2TP" ) == 0)? L2TP  :
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	    (strcasecmp(str, "PPPoE") == 0)? PPPOE :
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	    (strcasecmp(str, "SSTP" ) == 0)? SSTP  : PROTO_UNSPEC;
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}
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