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/* $OpenBSD: parser.c,v 1.4 2006/12/16 18:50:33 reyk Exp $ */
/*
* Copyright (c) 2006 Pierre-Yves Ritschard <pyr@spootnik.org>
* 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/socket.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <event.h>
#include "hostated.h"
#include "parser.h"
enum token_type {
NOTOKEN,
ENDTOKEN,
HOSTID,
TABLEID,
SERVICEID,
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_service[];
static const struct token t_table[];
static const struct token t_host[];
static const struct token t_service_id[];
static const struct token t_table_id[];
static const struct token t_host_id[];
static const struct token t_main[] = {
{KEYWORD, "show", SHOW_SUM, NULL},
{KEYWORD, "stop", SHUTDOWN, NULL},
{KEYWORD, "service", NULL, t_service},
{KEYWORD, "table", NULL, t_table},
{KEYWORD, "host", NULL, t_host},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_service[] = {
{NOTOKEN, "", NONE, NULL},
{KEYWORD, "disable", SERV_DISABLE, t_service_id},
{KEYWORD, "enable", SERV_ENABLE, t_service_id},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_table[] = {
{NOTOKEN, "", NONE, NULL},
{KEYWORD, "disable", TABLE_DISABLE, t_table_id},
{KEYWORD, "enable", TABLE_ENABLE, t_table_id},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_host[] = {
{NOTOKEN, "", NONE, NULL},
{KEYWORD, "disable", HOST_DISABLE, t_host_id},
{KEYWORD, "enable", HOST_ENABLE, t_host_id},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_service_id[] = {
{SERVICEID, "", NONE, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_table_id[] = {
{TABLEID, "", NONE, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_host_id[] = {
{HOSTID, "", NONE, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static struct parse_result res;
struct parse_result *
parse(int argc, char *argv[])
{
const struct token *table = t_main;
const struct token *match;
bzero(&res, sizeof(res));
while (argc > 0) {
if ((match = match_token(argv[0], table)) == 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);
}
const struct token *
match_token(const char *word, const struct token table[])
{
u_int i, match;
const struct token *t = NULL;
const char *errstr;
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 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 HOSTID:
res.id.id = strtonum(word, 0, UINT_MAX, &errstr);
if (errstr) {
strlcpy(res.id.name, word, sizeof(res.id.name));
res.id.id = EMPTY_ID;
}
t = &table[i];
match++;
break;
case TABLEID:
res.id.id = strtonum(word, 0, UINT_MAX, &errstr);
if (errstr) {
strlcpy(res.id.name, word, sizeof(res.id.name));
res.id.id = EMPTY_ID;
}
t = &table[i];
match++;
break;
case SERVICEID:
res.id.id = strtonum(word, 0, UINT_MAX, &errstr);
if (errstr) {
strlcpy(res.id.name, word, sizeof(res.id.name));
res.id.id = EMPTY_ID;
}
t = &table[i];
match++;
break;
case ENDTOKEN:
break;
}
}
if (match != 1) {
if (match > 1)
fprintf(stderr, "ambiguous argument: %s\n", word);
if (match < 1)
fprintf(stderr, "unknown argument: %s\n", word);
return (NULL);
}
return (t);
}
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 KEYWORD:
fprintf(stderr, " %s\n", table[i].keyword);
break;
case SERVICEID:
fprintf(stderr, " <serviceid>\n");
break;
case TABLEID:
fprintf(stderr, " <tableid>\n");
break;
case HOSTID:
fprintf(stderr, " <hostid>\n");
break;
case ENDTOKEN:
break;
}
}
}
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