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/* $OpenBSD: parser.c,v 1.27 2015/01/22 17:42:09 reyk Exp $ */
/*
* Copyright (c) 2006 Pierre-Yves Ritschard <pyr@openbsd.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 <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "relayd.h"
#include "parser.h"
enum token_type {
NOTOKEN,
ENDTOKEN,
HOSTID,
TABLEID,
RDRID,
KEYWORD,
PATH
};
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_show[];
static const struct token t_rdr[];
static const struct token t_table[];
static const struct token t_host[];
static const struct token t_rdr_id[];
static const struct token t_table_id[];
static const struct token t_host_id[];
static const struct token t_log[];
static const struct token t_load[];
static const struct token t_main[] = {
{KEYWORD, "monitor", MONITOR, NULL},
{KEYWORD, "show", NONE, t_show},
{KEYWORD, "load", LOAD, t_load},
{KEYWORD, "poll", POLL, NULL},
{KEYWORD, "reload", RELOAD, NULL},
{KEYWORD, "stop", SHUTDOWN, NULL},
{KEYWORD, "redirect", NONE, t_rdr},
{KEYWORD, "table", NONE, t_table},
{KEYWORD, "host", NONE, t_host},
{KEYWORD, "log", NONE, t_log},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_show[] = {
{KEYWORD, "summary", SHOW_SUM, NULL},
{KEYWORD, "hosts", SHOW_HOSTS, NULL},
{KEYWORD, "redirects", SHOW_RDRS, NULL},
{KEYWORD, "relays", SHOW_RELAYS, NULL},
{KEYWORD, "routers", SHOW_ROUTERS, NULL},
{KEYWORD, "sessions", SHOW_SESSIONS, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_rdr[] = {
{NOTOKEN, "", NONE, NULL},
{KEYWORD, "disable", RDR_DISABLE, t_rdr_id},
{KEYWORD, "enable", RDR_ENABLE, t_rdr_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_rdr_id[] = {
{RDRID, "", 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 const struct token t_log[] = {
{KEYWORD, "verbose", LOG_VERBOSE, NULL},
{KEYWORD, "brief", LOG_BRIEF, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_load[] = {
{PATH, "", NONE, 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;
bzero(&res, 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;
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:
if (word == NULL)
break;
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:
if (word == NULL)
break;
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 RDRID:
if (word == NULL)
break;
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 PATH:
if (!match && word != NULL && strlen(word) > 0) {
res->path = strdup(word);
match++;
t = &table[i];
}
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 KEYWORD:
fprintf(stderr, " %s\n", table[i].keyword);
break;
case RDRID:
fprintf(stderr, " <redirectid>\n");
break;
case TABLEID:
fprintf(stderr, " <tableid>\n");
break;
case HOSTID:
fprintf(stderr, " <hostid>\n");
break;
case PATH:
fprintf(stderr, " <path>\n");
break;
case ENDTOKEN:
break;
}
}
}
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