379 lines
8.4 KiB
C
379 lines
8.4 KiB
C
/* $OpenBSD: parser.c,v 1.21 2019/05/16 21:07:33 remi Exp $ */
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/*
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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/types.h>
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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 <err.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 "ospfd.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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ADDRESS,
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FLAG,
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PREFIX,
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IFNAME,
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AREA
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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 const struct token t_main[];
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static const struct token t_fib[];
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static const struct token t_show[];
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static const struct token t_show_iface[];
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static const struct token t_show_db[];
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static const struct token t_show_area[];
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static const struct token t_show_nbr[];
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static const struct token t_show_rib[];
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static const struct token t_show_fib[];
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static const struct token t_log[];
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static const struct token t_main[] = {
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{KEYWORD, "reload", RELOAD, NULL},
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{KEYWORD, "fib", FIB, t_fib},
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{KEYWORD, "show", SHOW, t_show},
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{KEYWORD, "log", NONE, t_log},
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{ENDTOKEN, "", NONE, NULL}
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};
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static const struct token t_fib[] = {
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{ KEYWORD, "couple", FIB_COUPLE, NULL},
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{ KEYWORD, "decouple", FIB_DECOUPLE, NULL},
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{ KEYWORD, "reload", FIB_RELOAD, NULL},
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{ ENDTOKEN, "", NONE, NULL}
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};
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static const struct token t_show[] = {
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{NOTOKEN, "", NONE, NULL},
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{KEYWORD, "interfaces", SHOW_IFACE, t_show_iface},
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{KEYWORD, "database", SHOW_DB, t_show_db},
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{KEYWORD, "neighbor", SHOW_NBR, t_show_nbr},
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{KEYWORD, "rib", SHOW_RIB, t_show_rib},
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{KEYWORD, "fib", SHOW_FIB, t_show_fib},
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{KEYWORD, "summary", SHOW_SUM, NULL},
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{ENDTOKEN, "", NONE, NULL}
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};
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static const struct token t_show_iface[] = {
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{NOTOKEN, "", NONE, NULL},
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{KEYWORD, "detail", SHOW_IFACE_DTAIL, NULL},
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{IFNAME, "", SHOW_IFACE_DTAIL, NULL},
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{ENDTOKEN, "", NONE, NULL}
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};
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static const struct token t_show_db[] = {
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{NOTOKEN, "", NONE, NULL},
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{KEYWORD, "area", SHOW_DBBYAREA, t_show_area},
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{KEYWORD, "asbr", SHOW_DBASBR, NULL},
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{KEYWORD, "external", SHOW_DBEXT, NULL},
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{KEYWORD, "network", SHOW_DBNET, NULL},
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{KEYWORD, "router", SHOW_DBRTR, NULL},
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{KEYWORD, "self-originated", SHOW_DBSELF, NULL},
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{KEYWORD, "summary", SHOW_DBSUM, NULL},
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{KEYWORD, "opaque", SHOW_DBOPAQ, NULL},
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{ENDTOKEN, "", NONE, NULL}
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};
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static const struct token t_show_area[] = {
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{AREA, "", NONE, NULL},
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{ENDTOKEN, "", NONE, NULL}
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};
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static const struct token t_show_nbr[] = {
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{NOTOKEN, "", NONE, NULL},
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{KEYWORD, "detail", SHOW_NBR_DTAIL, NULL},
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{ENDTOKEN, "", NONE, NULL}
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};
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static const struct token t_show_rib[] = {
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{NOTOKEN, "", NONE, NULL},
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{KEYWORD, "detail", SHOW_RIB_DTAIL, NULL},
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{ENDTOKEN, "", NONE, NULL}
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};
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static const struct token t_show_fib[] = {
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{NOTOKEN, "", NONE, NULL},
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{KEYWORD, "interface", SHOW_FIB_IFACE, t_show_iface},
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{FLAG, "connected", F_CONNECTED, t_show_fib},
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{FLAG, "static", F_STATIC, t_show_fib},
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{FLAG, "ospf", F_OSPFD_INSERTED, t_show_fib},
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{ADDRESS, "", NONE, NULL},
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{ENDTOKEN, "", NONE, NULL}
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};
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static const struct token t_log[] = {
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{KEYWORD, "verbose", LOG_VERBOSE, NULL},
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{KEYWORD, "brief", LOG_BRIEF, NULL},
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{ENDTOKEN, "", NONE, NULL}
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};
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static const struct token *match_token(const char *, const struct token *,
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struct parse_result *);
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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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static struct parse_result res;
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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, &res)) == 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(const char *word, const struct token *table,
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struct parse_result *res)
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{
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u_int i, match;
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const struct token *t = NULL;
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match = 0;
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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 FLAG:
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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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res->flags |= t->value;
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}
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break;
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case ADDRESS:
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if (parse_addr(word, &res->addr)) {
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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 AREA:
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if (parse_area(word, &res->addr)) {
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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 PREFIX:
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if (parse_prefix(word, &res->addr, &res->prefixlen)) {
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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 IFNAME:
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if (!match && word != NULL && strlen(word) > 0) {
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if (strlcpy(res->ifname, word,
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sizeof(res->ifname)) >=
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sizeof(res->ifname))
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err(1, "interface name too long");
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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 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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case FLAG:
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fprintf(stderr, " %s\n", table[i].keyword);
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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 AREA:
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fprintf(stderr, " <area>\n");
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break;
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case PREFIX:
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fprintf(stderr, " <address>[/<len>]\n");
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break;
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case IFNAME:
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fprintf(stderr, " <interface>\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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int
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parse_addr(const char *word, struct in_addr *addr)
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{
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struct in_addr ina;
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if (word == NULL)
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return (0);
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bzero(addr, sizeof(struct in_addr));
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bzero(&ina, sizeof(ina));
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if (inet_pton(AF_INET, word, &ina)) {
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addr->s_addr = ina.s_addr;
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return (1);
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}
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return (0);
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}
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int
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parse_area(const char *word, struct in_addr *addr)
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{
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struct in_addr ina;
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const char *errstr;
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if (word == NULL)
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return (0);
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bzero(addr, sizeof(struct in_addr));
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bzero(&ina, sizeof(ina));
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if (inet_pton(AF_INET, word, &ina)) {
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addr->s_addr = ina.s_addr;
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return (1);
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}
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ina.s_addr = htonl(strtonum(word, 0, 0xffffffff, &errstr));
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if (errstr == NULL) {
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addr->s_addr = ina.s_addr;
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return (1);
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}
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return (0);
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}
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int
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parse_prefix(const char *word, struct in_addr *addr, u_int8_t *prefixlen)
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{
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struct in_addr ina;
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int bits = 32;
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if (word == NULL)
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return (0);
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bzero(addr, sizeof(struct in_addr));
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bzero(&ina, sizeof(ina));
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if (strrchr(word, '/') != NULL) {
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if ((bits = inet_net_pton(AF_INET, word,
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&ina, sizeof(ina))) == -1)
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return (0);
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addr->s_addr = ina.s_addr & htonl(prefixlen2mask(bits));
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*prefixlen = bits;
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return (1);
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}
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*prefixlen = 32;
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return (parse_addr(word, addr));
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}
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/* XXX local copy from kroute.c, should go to shared file */
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in_addr_t
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prefixlen2mask(u_int8_t prefixlen)
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{
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if (prefixlen == 0)
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return (0);
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return (0xffffffff << (32 - prefixlen));
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}
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