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/* $OpenBSD: parse.y,v 1.71 2019/02/13 22:57:08 deraadt 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 <stdlib.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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TAILQ_HEAD(files, file) files = TAILQ_HEAD_INITIALIZER(files);
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static struct file {
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TAILQ_ENTRY(file) entry;
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FILE *stream;
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char *name;
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int lineno;
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int errors;
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} *file, *topfile;
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struct file *pushfile(const char *);
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int popfile(void);
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int yyparse(void);
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int yylex(void);
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int yyerror(const char *, ...)
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__attribute__((__format__ (printf, 1, 2)))
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__attribute__((__nonnull__ (1)));
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int kw_cmp(const void *, const void *);
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int lookup(char *);
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int lgetc(int);
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int lungetc(int);
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int findeol(void);
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struct ntpd_conf *conf;
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struct sockaddr_in query_addr4;
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struct sockaddr_in6 query_addr6;
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struct opts {
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int weight;
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int correction;
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int stratum;
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int rtable;
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char *refstr;
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} opts;
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void opts_default(void);
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typedef struct {
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union {
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int64_t number;
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char *string;
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struct ntp_addr_wrap *addr;
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struct opts opts;
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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 CONSTRAINT CONSTRAINTS FROM QUERY
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%token SERVER SERVERS SENSOR CORRECTION RTABLE REFID STRATUM WEIGHT
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%token ERROR
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%token <v.string> STRING
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%token <v.number> NUMBER
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%type <v.addr> address url
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%type <v.opts> listen_opts listen_opts_l listen_opt
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%type <v.opts> server_opts server_opts_l server_opt
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%type <v.opts> sensor_opts sensor_opts_l sensor_opt
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%type <v.opts> correction
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%type <v.opts> rtable
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%type <v.opts> refid
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%type <v.opts> stratum
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%type <v.opts> weight
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%%
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grammar : /* empty */
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| grammar '\n'
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| grammar main '\n'
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| grammar error '\n' { file->errors++; }
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;
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main : LISTEN ON address listen_opts {
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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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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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la->rtable = $4.rtable;
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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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| QUERY FROM STRING {
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struct sockaddr_in sin4;
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struct sockaddr_in6 sin6;
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memset(&sin4, 0, sizeof(sin4));
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sin4.sin_family = AF_INET;
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sin4.sin_len = sizeof(struct sockaddr_in);
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memset(&sin6, 0, sizeof(sin6));
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sin6.sin6_family = AF_INET6;
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sin6.sin6_len = sizeof(struct sockaddr_in6);
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if (inet_pton(AF_INET, $3, &sin4.sin_addr) == 1)
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memcpy(&query_addr4, &sin4, sin4.sin_len);
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else if (inet_pton(AF_INET6, $3, &sin6.sin6_addr) == 1)
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memcpy(&query_addr6, &sin6, sin6.sin6_len);
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else {
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yyerror("invalid IPv4 or IPv6 address: %s\n",
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$3);
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free($3);
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YYERROR;
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}
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free($3);
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}
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| SERVERS address server_opts {
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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->weight = $3.weight;
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p->query_addr4 = query_addr4;
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p->query_addr6 = query_addr6;
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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 server_opts {
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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->weight = $3.weight;
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p->query_addr4 = query_addr4;
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p->query_addr6 = query_addr6;
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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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| CONSTRAINTS FROM url {
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struct constraint *p;
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struct ntp_addr *h, *next;
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h = $3->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($3->name);
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free($3->path);
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free($3);
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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_constraint();
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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($3->name);
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p->addr_head.path = strdup($3->path);
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if (p->addr_head.name == NULL ||
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p->addr_head.path == 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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constraint_add(p);
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h = next;
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} while (h != NULL);
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free($3->name);
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free($3);
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}
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| CONSTRAINT FROM url {
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struct constraint *p;
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struct ntp_addr *h, *next;
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p = new_constraint();
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for (h = $3->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($3->name);
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free($3->path);
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free($3);
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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($3->name);
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p->addr_head.path = strdup($3->path);
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if (p->addr_head.name == NULL ||
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p->addr_head.path == 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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constraint_add(p);
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free($3->name);
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free($3);
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}
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| SENSOR STRING sensor_opts {
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struct ntp_conf_sensor *s;
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s = new_sensor($2);
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s->weight = $3.weight;
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s->correction = $3.correction;
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s->refstr = $3.refstr;
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s->stratum = $3.stratum;
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free($2);
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TAILQ_INSERT_TAIL(&conf->ntp_conf_sensors, s, entry);
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}
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;
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address : STRING {
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if (($$ = calloc(1, sizeof(struct ntp_addr_wrap))) ==
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NULL)
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fatal(NULL);
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host($1, &$$->a);
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$$->name = $1;
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}
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;
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url : STRING {
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char *hname, *path;
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if (($$ = calloc(1, sizeof(struct ntp_addr_wrap))) ==
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NULL)
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fatal("calloc");
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if (strncmp("https://", $1,
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strlen("https://")) != 0) {
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host($1, &$$->a);
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$$->name = $1;
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} else {
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hname = $1 + strlen("https://");
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path = hname + strcspn(hname, "/\\");
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if (*path != '\0') {
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if (($$->path = strdup(path)) == NULL)
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fatal("strdup");
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*path = '\0';
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}
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host(hname, &$$->a);
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if (($$->name = strdup(hname)) == NULL)
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fatal("strdup");
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}
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if ($$->path == NULL &&
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($$->path = strdup("/")) == NULL)
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fatal("strdup");
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}
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;
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listen_opts : { opts_default(); }
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listen_opts_l
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{ $$ = opts; }
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| { opts_default(); $$ = opts; }
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;
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listen_opts_l : listen_opts_l listen_opt
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| listen_opt
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;
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listen_opt : rtable
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;
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server_opts : { opts_default(); }
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server_opts_l
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{ $$ = opts; }
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| { opts_default(); $$ = opts; }
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;
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server_opts_l : server_opts_l server_opt
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| server_opt
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;
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server_opt : weight
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;
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sensor_opts : { opts_default(); }
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sensor_opts_l
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{ $$ = opts; }
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| { opts_default(); $$ = opts; }
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;
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sensor_opts_l : sensor_opts_l sensor_opt
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| sensor_opt
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;
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sensor_opt : correction
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| refid
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| stratum
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| weight
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;
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correction : CORRECTION NUMBER {
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if ($2 < -127000000 || $2 > 127000000) {
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yyerror("correction must be between "
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"-127000000 and 127000000 microseconds");
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YYERROR;
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}
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opts.correction = $2;
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}
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;
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refid : REFID STRING {
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size_t l = strlen($2);
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if (l < 1 || l > 4) {
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yyerror("refid must be 1 to 4 characters");
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free($2);
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YYERROR;
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}
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opts.refstr = $2;
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}
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;
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stratum : STRATUM NUMBER {
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if ($2 < 1 || $2 > 15) {
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yyerror("stratum must be between "
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"1 and 15");
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YYERROR;
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}
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opts.stratum = $2;
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}
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;
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weight : WEIGHT NUMBER {
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if ($2 < 1 || $2 > 10) {
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yyerror("weight must be between 1 and 10");
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YYERROR;
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}
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opts.weight = $2;
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}
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rtable : RTABLE NUMBER {
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if ($2 < 0 || $2 > RT_TABLEID_MAX) {
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yyerror("rtable must be between 1"
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" and RT_TABLEID_MAX");
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YYERROR;
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}
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opts.rtable = $2;
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}
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;
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%%
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void
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opts_default(void)
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|
{
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|
|
memset(&opts, 0, sizeof opts);
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opts.weight = 1;
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opts.stratum = 1;
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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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|
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int
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|
|
yyerror(const char *fmt, ...)
|
|
|
{
|
|
|
va_list ap;
|
|
|
char *msg;
|
|
|
|
|
|
file->errors++;
|
|
|
va_start(ap, fmt);
|
|
|
if (vasprintf(&msg, fmt, ap) == -1)
|
|
|
fatalx("yyerror vasprintf");
|
|
|
va_end(ap);
|
|
|
log_warnx("%s:%d: %s", file->name, yylval.lineno, msg);
|
|
|
free(msg);
|
|
|
return (0);
|
|
|
}
|
|
|
|
|
|
int
|
|
|
kw_cmp(const void *k, const void *e)
|
|
|
{
|
|
|
return (strcmp(k, ((const struct keywords *)e)->k_name));
|
|
|
}
|
|
|
|
|
|
int
|
|
|
lookup(char *s)
|
|
|
{
|
|
|
/* this has to be sorted always */
|
|
|
static const struct keywords keywords[] = {
|
|
|
{ "constraint", CONSTRAINT},
|
|
|
{ "constraints", CONSTRAINTS},
|
|
|
{ "correction", CORRECTION},
|
|
|
{ "from", FROM},
|
|
|
{ "listen", LISTEN},
|
|
|
{ "on", ON},
|
|
|
{ "query", QUERY},
|
|
|
{ "refid", REFID},
|
|
|
{ "rtable", RTABLE},
|
|
|
{ "sensor", SENSOR},
|
|
|
{ "server", SERVER},
|
|
|
{ "servers", SERVERS},
|
|
|
{ "stratum", STRATUM},
|
|
|
{ "weight", WEIGHT}
|
|
|
};
|
|
|
const struct keywords *p;
|
|
|
|
|
|
p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
|
|
|
sizeof(keywords[0]), kw_cmp);
|
|
|
|
|
|
if (p)
|
|
|
return (p->k_val);
|
|
|
else
|
|
|
return (STRING);
|
|
|
}
|
|
|
|
|
|
#define MAXPUSHBACK 128
|
|
|
|
|
|
u_char *parsebuf;
|
|
|
int parseindex;
|
|
|
u_char pushback_buffer[MAXPUSHBACK];
|
|
|
int pushback_index = 0;
|
|
|
|
|
|
int
|
|
|
lgetc(int quotec)
|
|
|
{
|
|
|
int c, next;
|
|
|
|
|
|
if (parsebuf) {
|
|
|
/* Read character from the parsebuffer instead of input. */
|
|
|
if (parseindex >= 0) {
|
|
|
c = parsebuf[parseindex++];
|
|
|
if (c != '\0')
|
|
|
return (c);
|
|
|
parsebuf = NULL;
|
|
|
} else
|
|
|
parseindex++;
|
|
|
}
|
|
|
|
|
|
if (pushback_index)
|
|
|
return (pushback_buffer[--pushback_index]);
|
|
|
|
|
|
if (quotec) {
|
|
|
if ((c = getc(file->stream)) == EOF) {
|
|
|
yyerror("reached end of file while parsing "
|
|
|
"quoted string");
|
|
|
if (file == topfile || popfile() == EOF)
|
|
|
return (EOF);
|
|
|
return (quotec);
|
|
|
}
|
|
|
return (c);
|
|
|
}
|
|
|
|
|
|
while ((c = getc(file->stream)) == '\\') {
|
|
|
next = getc(file->stream);
|
|
|
if (next != '\n') {
|
|
|
c = next;
|
|
|
break;
|
|
|
}
|
|
|
yylval.lineno = file->lineno;
|
|
|
file->lineno++;
|
|
|
}
|
|
|
|
|
|
while (c == EOF) {
|
|
|
if (file == topfile || popfile() == EOF)
|
|
|
return (EOF);
|
|
|
c = getc(file->stream);
|
|
|
}
|
|
|
return (c);
|
|
|
}
|
|
|
|
|
|
int
|
|
|
lungetc(int c)
|
|
|
{
|
|
|
if (c == EOF)
|
|
|
return (EOF);
|
|
|
if (parsebuf) {
|
|
|
parseindex--;
|
|
|
if (parseindex >= 0)
|
|
|
return (c);
|
|
|
}
|
|
|
if (pushback_index < MAXPUSHBACK-1)
|
|
|
return (pushback_buffer[pushback_index++] = c);
|
|
|
else
|
|
|
return (EOF);
|
|
|
}
|
|
|
|
|
|
int
|
|
|
findeol(void)
|
|
|
{
|
|
|
int c;
|
|
|
|
|
|
parsebuf = NULL;
|
|
|
|
|
|
/* skip to either EOF or the first real EOL */
|
|
|
while (1) {
|
|
|
if (pushback_index)
|
|
|
c = pushback_buffer[--pushback_index];
|
|
|
else
|
|
|
c = lgetc(0);
|
|
|
if (c == '\n') {
|
|
|
file->lineno++;
|
|
|
break;
|
|
|
}
|
|
|
if (c == EOF)
|
|
|
break;
|
|
|
}
|
|
|
return (ERROR);
|
|
|
}
|
|
|
|
|
|
int
|
|
|
yylex(void)
|
|
|
{
|
|
|
u_char buf[8096];
|
|
|
u_char *p;
|
|
|
int quotec, next, c;
|
|
|
int token;
|
|
|
|
|
|
p = buf;
|
|
|
while ((c = lgetc(0)) == ' ' || c == '\t')
|
|
|
; /* nothing */
|
|
|
|
|
|
yylval.lineno = file->lineno;
|
|
|
if (c == '#')
|
|
|
while ((c = lgetc(0)) != '\n' && c != EOF)
|
|
|
; /* nothing */
|
|
|
|
|
|
switch (c) {
|
|
|
case '\'':
|
|
|
case '"':
|
|
|
quotec = c;
|
|
|
while (1) {
|
|
|
if ((c = lgetc(quotec)) == EOF)
|
|
|
return (0);
|
|
|
if (c == '\n') {
|
|
|
file->lineno++;
|
|
|
continue;
|
|
|
} else if (c == '\\') {
|
|
|
if ((next = lgetc(quotec)) == EOF)
|
|
|
return (0);
|
|
|
if (next == quotec || next == ' ' ||
|
|
|
next == '\t')
|
|
|
c = next;
|
|
|
else if (next == '\n') {
|
|
|
file->lineno++;
|
|
|
continue;
|
|
|
} else
|
|
|
lungetc(next);
|
|
|
} else if (c == quotec) {
|
|
|
*p = '\0';
|
|
|
break;
|
|
|
} else if (c == '\0') {
|
|
|
yyerror("syntax error");
|
|
|
return (findeol());
|
|
|
}
|
|
|
if (p + 1 >= buf + sizeof(buf) - 1) {
|
|
|
yyerror("string too long");
|
|
|
return (findeol());
|
|
|
}
|
|
|
*p++ = c;
|
|
|
}
|
|
|
yylval.v.string = strdup(buf);
|
|
|
if (yylval.v.string == NULL)
|
|
|
fatal("yylex: strdup");
|
|
|
return (STRING);
|
|
|
}
|
|
|
|
|
|
#define allowed_to_end_number(x) \
|
|
|
(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
|
|
|
|
|
|
if (c == '-' || isdigit(c)) {
|
|
|
do {
|
|
|
*p++ = c;
|
|
|
if ((size_t)(p-buf) >= sizeof(buf)) {
|
|
|
yyerror("string too long");
|
|
|
return (findeol());
|
|
|
}
|
|
|
} while ((c = lgetc(0)) != EOF && isdigit(c));
|
|
|
lungetc(c);
|
|
|
if (p == buf + 1 && buf[0] == '-')
|
|
|
goto nodigits;
|
|
|
if (c == EOF || allowed_to_end_number(c)) {
|
|
|
const char *errstr = NULL;
|
|
|
|
|
|
*p = '\0';
|
|
|
yylval.v.number = strtonum(buf, LLONG_MIN,
|
|
|
LLONG_MAX, &errstr);
|
|
|
if (errstr) {
|
|
|
yyerror("\"%s\" invalid number: %s",
|
|
|
buf, errstr);
|
|
|
return (findeol());
|
|
|
}
|
|
|
return (NUMBER);
|
|
|
} else {
|
|
|
nodigits:
|
|
|
while (p > buf + 1)
|
|
|
lungetc(*--p);
|
|
|
c = *--p;
|
|
|
if (c == '-')
|
|
|
return (c);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
#define allowed_in_string(x) \
|
|
|
(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
|
|
|
x != '{' && x != '}' && x != '<' && x != '>' && \
|
|
|
x != '!' && x != '=' && x != '/' && x != '#' && \
|
|
|
x != ','))
|
|
|
|
|
|
if (isalnum(c) || c == ':' || c == '_' || c == '*') {
|
|
|
do {
|
|
|
*p++ = c;
|
|
|
if ((size_t)(p-buf) >= sizeof(buf)) {
|
|
|
yyerror("string too long");
|
|
|
return (findeol());
|
|
|
}
|
|
|
} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
|
|
|
lungetc(c);
|
|
|
*p = '\0';
|
|
|
if ((token = lookup(buf)) == STRING)
|
|
|
if ((yylval.v.string = strdup(buf)) == NULL)
|
|
|
fatal("yylex: strdup");
|
|
|
return (token);
|
|
|
}
|
|
|
if (c == '\n') {
|
|
|
yylval.lineno = file->lineno;
|
|
|
file->lineno++;
|
|
|
}
|
|
|
if (c == EOF)
|
|
|
return (0);
|
|
|
return (c);
|
|
|
}
|
|
|
|
|
|
struct file *
|
|
|
pushfile(const char *name)
|
|
|
{
|
|
|
struct file *nfile;
|
|
|
|
|
|
if ((nfile = calloc(1, sizeof(struct file))) == NULL) {
|
|
|
log_warn("%s", __func__);
|
|
|
return (NULL);
|
|
|
}
|
|
|
if ((nfile->name = strdup(name)) == NULL) {
|
|
|
log_warn("%s", __func__);
|
|
|
free(nfile);
|
|
|
return (NULL);
|
|
|
}
|
|
|
if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
|
|
|
log_warn("%s: %s", __func__, nfile->name);
|
|
|
free(nfile->name);
|
|
|
free(nfile);
|
|
|
return (NULL);
|
|
|
}
|
|
|
nfile->lineno = 1;
|
|
|
TAILQ_INSERT_TAIL(&files, nfile, entry);
|
|
|
return (nfile);
|
|
|
}
|
|
|
|
|
|
int
|
|
|
popfile(void)
|
|
|
{
|
|
|
struct file *prev;
|
|
|
|
|
|
if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
|
|
|
prev->errors += file->errors;
|
|
|
|
|
|
TAILQ_REMOVE(&files, file, entry);
|
|
|
fclose(file->stream);
|
|
|
free(file->name);
|
|
|
free(file);
|
|
|
file = prev;
|
|
|
return (file ? 0 : EOF);
|
|
|
}
|
|
|
|
|
|
int
|
|
|
parse_config(const char *filename, struct ntpd_conf *xconf)
|
|
|
{
|
|
|
int errors = 0;
|
|
|
|
|
|
conf = xconf;
|
|
|
TAILQ_INIT(&conf->listen_addrs);
|
|
|
TAILQ_INIT(&conf->ntp_peers);
|
|
|
TAILQ_INIT(&conf->ntp_conf_sensors);
|
|
|
TAILQ_INIT(&conf->constraints);
|
|
|
|
|
|
if ((file = pushfile(filename)) == NULL) {
|
|
|
return (-1);
|
|
|
}
|
|
|
topfile = file;
|
|
|
|
|
|
yyparse();
|
|
|
errors = file->errors;
|
|
|
popfile();
|
|
|
|
|
|
return (errors ? -1 : 0);
|
|
|
}
|