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/* $OpenBSD: parse.y,v 1.25 2005/06/19 16:42:57 henning Exp $ */
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/*
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* Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
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* Copyright (c) 2001 Markus Friedl. All rights reserved.
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* Copyright (c) 2001 Daniel Hartmeier. All rights reserved.
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* Copyright (c) 2001 Theo de Raadt. All rights reserved.
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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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%{
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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 <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include "ntpd.h"
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static struct ntpd_conf *conf;
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static FILE *fin = NULL;
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static int lineno = 1;
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static int errors = 0;
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const char *infile;
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int yyerror(const char *, ...);
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int yyparse(void);
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int kw_cmp(const void *, const void *);
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int lookup(char *);
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int lgetc(FILE *);
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int lungetc(int);
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int findeol(void);
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int yylex(void);
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typedef struct {
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union {
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u_int32_t number;
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char *string;
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struct ntp_addr_wrap *addr;
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} v;
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int lineno;
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} YYSTYPE;
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%}
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%token LISTEN ON
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%token SERVER SERVERS
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%token ERROR
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%token <v.string> STRING
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%type <v.addr> address
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%%
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grammar : /* empty */
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| grammar '\n'
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| grammar conf_main '\n'
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| grammar error '\n' { errors++; }
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;
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conf_main : LISTEN ON address {
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struct listen_addr *la;
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struct ntp_addr *h, *next;
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if ((h = $3->a) == NULL &&
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(host_dns($3->name, &h) == -1 || !h)) {
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yyerror("could not resolve \"%s\"", $3->name);
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free($3->name);
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free($3);
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YYERROR;
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}
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for (; h != NULL; h = next) {
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next = h->next;
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if (h->ss.ss_family == AF_UNSPEC) {
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conf->listen_all = 1;
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free(h);
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continue;
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}
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la = calloc(1, sizeof(struct listen_addr));
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if (la == NULL)
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fatal("listen on calloc");
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la->fd = -1;
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memcpy(&la->sa, &h->ss,
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sizeof(struct sockaddr_storage));
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TAILQ_INSERT_TAIL(&conf->listen_addrs, la,
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entry);
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free(h);
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}
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free($3->name);
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free($3);
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}
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| SERVERS address {
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struct ntp_peer *p;
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struct ntp_addr *h, *next;
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h = $2->a;
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do {
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if (h != NULL) {
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next = h->next;
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if (h->ss.ss_family != AF_INET &&
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h->ss.ss_family != AF_INET6) {
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yyerror("IPv4 or IPv6 address "
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"or hostname expected");
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free(h);
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free($2->name);
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free($2);
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YYERROR;
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}
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h->next = NULL;
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} else
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next = NULL;
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p = new_peer();
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p->addr = h;
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p->addr_head.a = h;
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p->addr_head.pool = 1;
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p->addr_head.name = strdup($2->name);
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if (p->addr_head.name == NULL)
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fatal(NULL);
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if (p->addr != NULL)
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p->state = STATE_DNS_DONE;
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TAILQ_INSERT_TAIL(&conf->ntp_peers, p, entry);
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h = next;
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} while (h != NULL);
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free($2->name);
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free($2);
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}
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| SERVER address {
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struct ntp_peer *p;
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struct ntp_addr *h, *next;
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p = new_peer();
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for (h = $2->a; h != NULL; h = next) {
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next = h->next;
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if (h->ss.ss_family != AF_INET &&
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h->ss.ss_family != AF_INET6) {
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yyerror("IPv4 or IPv6 address "
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"or hostname expected");
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free(h);
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free(p);
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free($2->name);
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free($2);
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YYERROR;
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}
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h->next = p->addr;
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p->addr = h;
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}
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p->addr_head.a = p->addr;
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p->addr_head.pool = 0;
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p->addr_head.name = strdup($2->name);
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if (p->addr_head.name == NULL)
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fatal(NULL);
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if (p->addr != NULL)
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p->state = STATE_DNS_DONE;
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TAILQ_INSERT_TAIL(&conf->ntp_peers, p, entry);
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free($2->name);
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free($2);
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}
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;
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address : STRING {
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if (($$ = calloc(1, sizeof(struct ntp_addr_wrap))) ==
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NULL)
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fatal(NULL);
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if (host($1, &$$->a) == -1) {
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yyerror("could not parse address spec \"%s\"",
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$1);
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free($1);
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free($$);
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YYERROR;
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}
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$$->name = $1;
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}
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;
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%%
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struct keywords {
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const char *k_name;
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int k_val;
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};
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int
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yyerror(const char *fmt, ...)
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{
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va_list ap;
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char *nfmt;
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errors = 1;
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va_start(ap, fmt);
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if (asprintf(&nfmt, "%s:%d: %s", infile, yylval.lineno, fmt) == -1)
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fatalx("yyerror asprintf");
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vlog(LOG_CRIT, nfmt, ap);
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va_end(ap);
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free(nfmt);
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return (0);
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}
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int
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kw_cmp(const void *k, const void *e)
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{
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return (strcmp(k, ((const struct keywords *)e)->k_name));
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}
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int
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lookup(char *s)
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{
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/* this has to be sorted always */
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static const struct keywords keywords[] = {
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{ "listen", LISTEN},
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{ "on", ON},
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{ "server", SERVER},
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{ "servers", SERVERS}
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};
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const struct keywords *p;
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p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
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sizeof(keywords[0]), kw_cmp);
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if (p)
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return (p->k_val);
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else
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return (STRING);
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}
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#define MAXPUSHBACK 128
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char *parsebuf;
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int parseindex;
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char pushback_buffer[MAXPUSHBACK];
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int pushback_index = 0;
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int
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lgetc(FILE *f)
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{
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int c, next;
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if (parsebuf) {
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/* Read character from the parsebuffer instead of input. */
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if (parseindex >= 0) {
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c = parsebuf[parseindex++];
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if (c != '\0')
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return (c);
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parsebuf = NULL;
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} else
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parseindex++;
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}
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if (pushback_index)
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return (pushback_buffer[--pushback_index]);
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while ((c = getc(f)) == '\\') {
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next = getc(f);
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if (next != '\n') {
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if (isspace(next))
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yyerror("whitespace after \\");
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ungetc(next, f);
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break;
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}
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yylval.lineno = lineno;
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lineno++;
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}
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if (c == '\t' || c == ' ') {
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/* Compress blanks to a single space. */
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do {
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c = getc(f);
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} while (c == '\t' || c == ' ');
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ungetc(c, f);
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c = ' ';
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}
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return (c);
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}
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int
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lungetc(int c)
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{
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if (c == EOF)
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return (EOF);
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if (parsebuf) {
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parseindex--;
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if (parseindex >= 0)
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return (c);
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}
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if (pushback_index < MAXPUSHBACK-1)
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return (pushback_buffer[pushback_index++] = c);
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else
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return (EOF);
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}
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int
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findeol(void)
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{
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int c;
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parsebuf = NULL;
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pushback_index = 0;
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/* skip to either EOF or the first real EOL */
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while (1) {
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c = lgetc(fin);
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if (c == '\n') {
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lineno++;
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break;
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}
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if (c == EOF)
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break;
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}
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return (ERROR);
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}
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int
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yylex(void)
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{
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char buf[8096];
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char *p;
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int endc, c;
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int token;
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p = buf;
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while ((c = lgetc(fin)) == ' ')
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; /* nothing */
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yylval.lineno = lineno;
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if (c == '#')
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while ((c = lgetc(fin)) != '\n' && c != EOF)
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; /* nothing */
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switch (c) {
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case '\'':
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case '"':
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endc = c;
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while (1) {
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if ((c = lgetc(fin)) == EOF)
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return (0);
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if (c == endc) {
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*p = '\0';
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break;
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}
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if (c == '\n') {
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lineno++;
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continue;
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}
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if (p + 1 >= buf + sizeof(buf) - 1) {
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yyerror("string too long");
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return (findeol());
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}
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*p++ = (char)c;
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}
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yylval.v.string = strdup(buf);
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if (yylval.v.string == NULL)
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fatal("yylex: strdup");
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return (STRING);
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}
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#define allowed_in_string(x) \
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(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
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x != '{' && x != '}' && x != '<' && x != '>' && \
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x != '!' && x != '=' && x != '/' && x != '#' && \
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x != ','))
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if (isalnum(c) || c == ':' || c == '_' || c == '*') {
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do {
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*p++ = c;
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if ((unsigned)(p-buf) >= sizeof(buf)) {
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yyerror("string too long");
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return (findeol());
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}
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} while ((c = lgetc(fin)) != EOF && (allowed_in_string(c)));
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lungetc(c);
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*p = '\0';
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if ((token = lookup(buf)) == STRING)
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if ((yylval.v.string = strdup(buf)) == NULL)
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fatal("yylex: strdup");
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return (token);
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}
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if (c == '\n') {
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yylval.lineno = lineno;
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lineno++;
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}
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if (c == EOF)
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return (0);
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return (c);
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}
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int
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parse_config(const char *filename, struct ntpd_conf *xconf)
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{
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conf = xconf;
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lineno = 1;
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errors = 0;
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TAILQ_INIT(&conf->listen_addrs);
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TAILQ_INIT(&conf->ntp_peers);
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if ((fin = fopen(filename, "r")) == NULL) {
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log_warn("%s", filename);
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return (-1);
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}
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infile = filename;
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yyparse();
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fclose(fin);
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return (errors ? -1 : 0);
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}
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