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/* $OpenBSD: parser.c,v 1.2 2021/07/26 09:26:36 florian Exp $ */
/*
* Copyright (c) 2004 Esben Norby <norby@openbsd.org>
* Copyright (c) 2003, 2004 Henning Brauer <henning@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/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <imsg.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dhcpleased.h"
#include "parser.h"
enum token_type {
NOTOKEN,
ENDTOKEN,
INTERFACENAME,
KEYWORD
};
struct token {
enum token_type type;
const char *keyword;
int value;
const struct token *next;
};
static const struct token t_main[];
static const struct token t_log[];
static const struct token t_show[];
static const struct token t_show_interface[];
static const struct token t_send[];
static const struct token t_send_request[];
static const struct token t_main[] = {
{KEYWORD, "reload", RELOAD, NULL},
{KEYWORD, "show", SHOW, t_show},
{KEYWORD, "log", NONE, t_log},
{KEYWORD, "send", NONE, t_send},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_log[] = {
{KEYWORD, "verbose", LOG_VERBOSE, NULL},
{KEYWORD, "brief", LOG_BRIEF, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_show[] = {
{KEYWORD, "interface", SHOW_INTERFACE, t_show_interface},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_send[] = {
{KEYWORD, "request", SEND_REQUEST, t_send_request},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_send_request[] = {
{INTERFACENAME, "", SEND_REQUEST, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_show_interface[] = {
{NOTOKEN, "", NONE, NULL},
{INTERFACENAME, "", SHOW_INTERFACE, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token *match_token(const char *, const struct token *,
struct parse_result *);
static void show_valid_args(const struct token *);
struct parse_result *
parse(int argc, char *argv[])
{
static struct parse_result res;
const struct token *table = t_main;
const struct token *match;
memset(&res, 0, sizeof(res));
while (argc >= 0) {
if ((match = match_token(argv[0], table, &res)) == NULL) {
fprintf(stderr, "valid commands/args:\n");
show_valid_args(table);
return (NULL);
}
argc--;
argv++;
if (match->type == NOTOKEN || match->next == NULL)
break;
table = match->next;
}
if (argc > 0) {
fprintf(stderr, "superfluous argument: %s\n", argv[0]);
return (NULL);
}
return (&res);
}
static const struct token *
match_token(const char *word, const struct token *table,
struct parse_result *res)
{
u_int i, match;
const struct token *t = NULL;
match = 0;
for (i = 0; table[i].type != ENDTOKEN; i++) {
switch (table[i].type) {
case NOTOKEN:
if (word == NULL || strlen(word) == 0) {
match++;
t = &table[i];
}
break;
case INTERFACENAME:
if (!match && word != NULL && strlen(word) > 0) {
if ((res->if_index = if_nametoindex(word)) == 0)
errx(1, "unknown interface");
match++;
t = &table[i];
if (t->value)
res->action = t->value;
}
break;
case KEYWORD:
if (word != NULL && strncmp(word, table[i].keyword,
strlen(word)) == 0) {
match++;
t = &table[i];
if (t->value)
res->action = t->value;
}
break;
case ENDTOKEN:
break;
}
}
if (match != 1) {
if (word == NULL)
fprintf(stderr, "missing argument:\n");
else if (match > 1)
fprintf(stderr, "ambiguous argument: %s\n", word);
else if (match < 1)
fprintf(stderr, "unknown argument: %s\n", word);
return (NULL);
}
return (t);
}
static void
show_valid_args(const struct token *table)
{
int i;
for (i = 0; table[i].type != ENDTOKEN; i++) {
switch (table[i].type) {
case NOTOKEN:
fprintf(stderr, " <cr>\n");
break;
case INTERFACENAME:
fprintf(stderr, " <interface>\n");
break;
case KEYWORD:
fprintf(stderr, " %s\n", table[i].keyword);
break;
case ENDTOKEN:
break;
}
}
}
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