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/* $OpenBSD: parser.c,v 1.4 2018/10/15 11:30:01 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 <sys/uio.h>
#include <netinet/in.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <limits.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "iscsid.h"
#include "iscsictl.h"
enum token_type {
NOTOKEN,
ENDTOKEN,
KEYWORD,
ADDRESS,
NAME,
FLAG
};
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_log[];
static const struct token t_discovery[];
static const struct token t_session[];
static const struct token t_vscsi[];
static const struct token t_main[] = {
{KEYWORD, "reload", RELOAD, NULL},
{KEYWORD, "discover", DISCOVERY, t_discovery},
{KEYWORD, "show", SHOW_SUM, t_show},
{KEYWORD, "log", NONE, t_log},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_show[] = {
{NOTOKEN, "", NONE, NULL},
{KEYWORD, "summary", SHOW_SUM, NULL},
{KEYWORD, "session", SHOW_SESS, t_session},
{KEYWORD, "vscsi", NONE, t_vscsi},
{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_discovery[] = {
{ADDRESS, "", NONE, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_session[] = {
{NAME, "", NONE, NULL},
{ENDTOKEN, "", NONE, NULL}
};
static const struct token t_vscsi[] = {
{KEYWORD, "stats", SHOW_VSCSI_STATS, 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;
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 FLAG:
if (word != NULL && strncmp(word, table[i].keyword,
strlen(word)) == 0) {
match++;
t = &table[i];
res.flags |= t->value;
}
break;
case ADDRESS:
if (!parse_addr(word, &res.addr)) {
match++;
t = &table[i];
if (t->value)
res.action = t->value;
}
break;
case NAME:
if (word != NULL && strlen(word) > 0) {
if (strlcpy(res.name, word, sizeof(res.name)) >=
sizeof(res.name))
errx(1, "name too long");
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);
}
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:
case FLAG:
fprintf(stderr, " %s\n", table[i].keyword);
break;
case ADDRESS:
fprintf(stderr, " <address>\n");
break;
case NAME:
fprintf(stderr, " <name>\n");
break;
case ENDTOKEN:
break;
}
}
}
int
parse_addr(const char *word, struct sockaddr_storage *sa)
{
struct addrinfo hints, *addrs;
int rv;
bzero(&hints, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if ((rv = getaddrinfo(word, "iscsi", &hints, &addrs)) == 0) {
bcopy(addrs->ai_addr, sa, addrs->ai_addrlen);
freeaddrinfo(addrs);
return (0);
}
errx(1, "parse_host: %s", gai_strerror(rv));
}
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