865 lines
17 KiB
Plaintext
865 lines
17 KiB
Plaintext
/* $OpenBSD: parse.y,v 1.8 2023/11/25 12:00:39 florian Exp $ */
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/*
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* Copyright (c) 2018 Florian Obser <florian@openbsd.org>
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* Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
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* Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
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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/queue.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <event.h>
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#include <imsg.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 <unistd.h>
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#include <vis.h>
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#include "log.h"
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#include "dhcpleased.h"
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#include "frontend.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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size_t ungetpos;
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size_t ungetsize;
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u_char *ungetbuf;
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int eof_reached;
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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 *, int);
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int popfile(void);
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int check_file_secrecy(int, const char *);
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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 igetc(void);
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int lgetc(int);
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void lungetc(int);
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int findeol(void);
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TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
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struct sym {
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TAILQ_ENTRY(sym) entry;
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int used;
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int persist;
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char *nam;
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char *val;
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};
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int symset(const char *, const char *, int);
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char *symget(const char *);
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static struct dhcpleased_conf *conf;
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static int errors;
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static struct iface_conf *iface_conf;
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struct iface_conf *conf_get_iface(char *);
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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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} v;
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int lineno;
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} YYSTYPE;
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%}
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%token DHCP_IFACE ERROR SEND VENDOR CLASS ID CLIENT IGNORE DNS ROUTES HOST NAME
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%token NO PREFER IPV6
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%token <v.string> STRING
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%token <v.number> NUMBER
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%type <v.string> string
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%%
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grammar : /* empty */
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| grammar '\n'
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| grammar varset '\n'
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| grammar dhcp_iface '\n'
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| grammar error '\n' { file->errors++; }
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;
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string : string STRING {
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if (asprintf(&$$, "%s %s", $1, $2) == -1) {
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free($1);
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free($2);
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yyerror("string: asprintf");
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YYERROR;
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}
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free($1);
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free($2);
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}
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| STRING
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;
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varset : STRING '=' string {
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char *s = $1;
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if (log_getverbose() == 1)
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printf("%s = \"%s\"\n", $1, $3);
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while (*s++) {
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if (isspace((unsigned char)*s)) {
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yyerror("macro name cannot contain "
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"whitespace");
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free($1);
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free($3);
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YYERROR;
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}
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}
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if (symset($1, $3, 0) == -1)
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fatal("cannot store variable");
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free($1);
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free($3);
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}
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;
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optnl : '\n' optnl /* zero or more newlines */
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| /*empty*/
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;
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nl : '\n' optnl /* one or more newlines */
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;
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dhcp_iface : DHCP_IFACE STRING {
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iface_conf = conf_get_iface($2);
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} '{' iface_block '}' {
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iface_conf = NULL;
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}
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;
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iface_block : optnl ifaceopts_l
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| optnl
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;
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ifaceopts_l : ifaceopts_l ifaceoptsl nl
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| ifaceoptsl optnl
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;
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ifaceoptsl : SEND VENDOR CLASS ID STRING {
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ssize_t len;
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char buf[256];
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if (iface_conf->vc_id != NULL) {
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yyerror("vendor class id already set");
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YYERROR;
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}
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len = strnunvis(buf, $5, sizeof(buf));
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free($5);
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if (len == -1) {
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yyerror("invalid vendor class id");
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YYERROR;
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}
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if ((size_t)len >= sizeof(buf)) {
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yyerror("vendor class id too long");
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YYERROR;
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}
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iface_conf->vc_id_len = 2 + strlen(buf);
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iface_conf->vc_id = malloc(iface_conf->vc_id_len);
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if (iface_conf->vc_id == NULL) {
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yyerror("malloc");
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YYERROR;
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}
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iface_conf->vc_id[0] = DHO_DHCP_CLASS_IDENTIFIER;
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iface_conf->vc_id[1] = iface_conf->vc_id_len - 2;
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memcpy(&iface_conf->vc_id[2], buf,
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iface_conf->vc_id_len - 2);
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}
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| SEND CLIENT ID STRING {
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size_t i;
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ssize_t len;
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int not_hex = 0, val;
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char buf[256], *hex, *p, excess;
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if (iface_conf->c_id != NULL) {
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yyerror("client-id already set");
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YYERROR;
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}
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/* parse as hex string including the type byte */
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if ((hex = strdup($4)) == NULL) {
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free($4);
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yyerror("malloc");
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YYERROR;
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}
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for (i = 0; (p = strsep(&hex, ":")) != NULL && i <
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sizeof(buf); ) {
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if (sscanf(p, "%x%c", &val, &excess) != 1 ||
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val < 0 || val > 0xff) {
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not_hex = 1;
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break;
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}
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buf[i++] = (val & 0xff);
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}
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if (p != NULL && i == sizeof(buf))
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not_hex = 1;
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free(hex);
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if (not_hex) {
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len = strnunvis(buf, $4, sizeof(buf));
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free($4);
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if (len == -1) {
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yyerror("invalid client-id");
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YYERROR;
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}
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if ((size_t)len >= sizeof(buf)) {
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yyerror("client-id too long");
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YYERROR;
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}
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iface_conf->c_id_len = 2 + len;
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iface_conf->c_id = malloc(iface_conf->c_id_len);
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if (iface_conf->c_id == NULL) {
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yyerror("malloc");
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YYERROR;
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}
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memcpy(&iface_conf->c_id[2], buf,
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iface_conf->c_id_len - 2);
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} else {
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free($4);
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iface_conf->c_id_len = 2 + i;
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iface_conf->c_id = malloc(iface_conf->c_id_len);
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if (iface_conf->c_id == NULL) {
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yyerror("malloc");
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YYERROR;
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}
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memcpy(&iface_conf->c_id[2], buf,
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iface_conf->c_id_len - 2);
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}
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iface_conf->c_id[0] = DHO_DHCP_CLIENT_IDENTIFIER;
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iface_conf->c_id[1] = iface_conf->c_id_len - 2;
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}
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| SEND HOST NAME STRING {
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if (iface_conf->h_name != NULL) {
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free($4);
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yyerror("host name already set");
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YYERROR;
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}
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if (strlen($4) > 255) {
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free($4);
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yyerror("host name too long");
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YYERROR;
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}
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iface_conf->h_name = $4;
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}
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| SEND NO HOST NAME {
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if (iface_conf->h_name != NULL) {
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yyerror("host name already set");
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YYERROR;
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}
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if ((iface_conf->h_name = strdup("")) == NULL) {
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yyerror("malloc");
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YYERROR;
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}
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}
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| IGNORE ROUTES {
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iface_conf->ignore |= IGN_ROUTES;
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}
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| IGNORE DNS {
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iface_conf->ignore |= IGN_DNS;
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}
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| IGNORE STRING {
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int res;
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if (iface_conf->ignore_servers_len >= MAX_SERVERS) {
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yyerror("too many servers to ignore");
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free($2);
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YYERROR;
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}
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res = inet_pton(AF_INET, $2,
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&iface_conf->ignore_servers[
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iface_conf->ignore_servers_len++]);
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if (res != 1) {
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yyerror("Invalid server IP %s", $2);
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free($2);
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YYERROR;
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}
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free($2);
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}
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| PREFER IPV6 {
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iface_conf->prefer_ipv6 = 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 *msg;
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file->errors++;
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va_start(ap, fmt);
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if (vasprintf(&msg, fmt, ap) == -1)
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fatalx("yyerror vasprintf");
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va_end(ap);
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logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
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free(msg);
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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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{"class", CLASS},
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{"client", CLIENT},
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{"dns", DNS},
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{"host", HOST},
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{"id", ID},
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{"ignore", IGNORE},
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{"interface", DHCP_IFACE},
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{"ipv6", IPV6},
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{"name", NAME},
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{"no", NO},
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{"prefer", PREFER},
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{"routes", ROUTES},
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{"send", SEND},
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{"vendor", VENDOR},
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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 START_EXPAND 1
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#define DONE_EXPAND 2
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static int expanding;
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int
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igetc(void)
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{
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int c;
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while (1) {
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if (file->ungetpos > 0)
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c = file->ungetbuf[--file->ungetpos];
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else
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c = getc(file->stream);
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if (c == START_EXPAND)
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expanding = 1;
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else if (c == DONE_EXPAND)
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expanding = 0;
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else
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break;
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}
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return (c);
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}
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int
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lgetc(int quotec)
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{
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int c, next;
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if (quotec) {
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if ((c = igetc()) == EOF) {
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yyerror("reached end of file while parsing "
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"quoted string");
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if (file == topfile || popfile() == EOF)
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return (EOF);
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return (quotec);
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}
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return (c);
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}
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while ((c = igetc()) == '\\') {
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next = igetc();
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if (next != '\n') {
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c = next;
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break;
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}
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yylval.lineno = file->lineno;
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file->lineno++;
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}
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if (c == EOF) {
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/*
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* Fake EOL when hit EOF for the first time. This gets line
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* count right if last line in included file is syntactically
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* invalid and has no newline.
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*/
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if (file->eof_reached == 0) {
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file->eof_reached = 1;
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return ('\n');
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}
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while (c == EOF) {
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if (file == topfile || popfile() == EOF)
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return (EOF);
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c = igetc();
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}
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}
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return (c);
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}
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void
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lungetc(int c)
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{
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if (c == EOF)
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return;
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|
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if (file->ungetpos >= file->ungetsize) {
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void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
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if (p == NULL)
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err(1, "lungetc");
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file->ungetbuf = p;
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file->ungetsize *= 2;
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}
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file->ungetbuf[file->ungetpos++] = c;
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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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|
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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(0);
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if (c == '\n') {
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file->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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|
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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, *val;
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int quotec, next, c;
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int token;
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top:
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p = buf;
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while ((c = lgetc(0)) == ' ' || c == '\t')
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; /* nothing */
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yylval.lineno = file->lineno;
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if (c == '#')
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while ((c = lgetc(0)) != '\n' && c != EOF)
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; /* nothing */
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if (c == '$' && !expanding) {
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while (1) {
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if ((c = lgetc(0)) == EOF)
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return (0);
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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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if (isalnum(c) || c == '_') {
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*p++ = c;
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continue;
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}
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*p = '\0';
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lungetc(c);
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break;
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}
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val = symget(buf);
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if (val == NULL) {
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yyerror("macro '%s' not defined", buf);
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return (findeol());
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}
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p = val + strlen(val) - 1;
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lungetc(DONE_EXPAND);
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while (p >= val) {
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lungetc((unsigned char)*p);
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p--;
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}
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lungetc(START_EXPAND);
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goto top;
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}
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|
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switch (c) {
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case '\'':
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case '"':
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quotec = c;
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while (1) {
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if ((c = lgetc(quotec)) == EOF)
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return (0);
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if (c == '\n') {
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file->lineno++;
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continue;
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} else if (c == '\\') {
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if ((next = lgetc(quotec)) == EOF)
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return (0);
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if (next == quotec || next == ' ' ||
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next == '\t')
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c = next;
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else if (next == '\n') {
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file->lineno++;
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continue;
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} else
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lungetc(next);
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} else if (c == quotec) {
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*p = '\0';
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break;
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} else if (c == '\0') {
|
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yyerror("syntax error");
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return (findeol());
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}
|
|
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)
|
|
err(1, "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((unsigned char)*--p);
|
|
c = (unsigned char)*--p;
|
|
if (c == '-')
|
|
return (c);
|
|
}
|
|
}
|
|
|
|
#define allowed_in_string(x) \
|
|
(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
|
|
x != '{' && x != '}' && \
|
|
x != '!' && x != '=' && x != '#' && \
|
|
x != ','))
|
|
|
|
if (isalnum(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)
|
|
err(1, "yylex: strdup");
|
|
return (token);
|
|
}
|
|
if (c == '\n') {
|
|
yylval.lineno = file->lineno;
|
|
file->lineno++;
|
|
}
|
|
if (c == EOF)
|
|
return (0);
|
|
return (c);
|
|
}
|
|
|
|
int
|
|
check_file_secrecy(int fd, const char *fname)
|
|
{
|
|
struct stat st;
|
|
|
|
if (fstat(fd, &st)) {
|
|
log_warn("cannot stat %s", fname);
|
|
return (-1);
|
|
}
|
|
if (st.st_uid != 0 && st.st_uid != getuid()) {
|
|
log_warnx("%s: owner not root or current user", fname);
|
|
return (-1);
|
|
}
|
|
if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
|
|
log_warnx("%s: group writable or world read/writable", fname);
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
struct file *
|
|
pushfile(const char *name, int secret)
|
|
{
|
|
struct file *nfile;
|
|
|
|
if ((nfile = calloc(1, sizeof(struct file))) == NULL) {
|
|
log_warn("calloc");
|
|
return (NULL);
|
|
}
|
|
if ((nfile->name = strdup(name)) == NULL) {
|
|
log_warn("strdup");
|
|
free(nfile);
|
|
return (NULL);
|
|
}
|
|
if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
|
|
free(nfile->name);
|
|
free(nfile);
|
|
return (NULL);
|
|
} else if (secret &&
|
|
check_file_secrecy(fileno(nfile->stream), nfile->name)) {
|
|
fclose(nfile->stream);
|
|
free(nfile->name);
|
|
free(nfile);
|
|
return (NULL);
|
|
}
|
|
nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
|
|
nfile->ungetsize = 16;
|
|
nfile->ungetbuf = malloc(nfile->ungetsize);
|
|
if (nfile->ungetbuf == NULL) {
|
|
log_warn("malloc");
|
|
fclose(nfile->stream);
|
|
free(nfile->name);
|
|
free(nfile);
|
|
return (NULL);
|
|
}
|
|
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->ungetbuf);
|
|
free(file);
|
|
file = prev;
|
|
return (file ? 0 : EOF);
|
|
}
|
|
|
|
struct dhcpleased_conf *
|
|
parse_config(const char *filename)
|
|
{
|
|
extern const char default_conffile[];
|
|
struct sym *sym, *next;
|
|
|
|
conf = config_new_empty();
|
|
|
|
file = pushfile(filename, 0);
|
|
if (file == NULL) {
|
|
/* no default config file is fine */
|
|
if (errno == ENOENT && filename == default_conffile)
|
|
return (conf);
|
|
log_warn("%s", filename);
|
|
free(conf);
|
|
return (NULL);
|
|
}
|
|
topfile = file;
|
|
|
|
yyparse();
|
|
errors = file->errors;
|
|
popfile();
|
|
|
|
/* Free macros and check which have not been used. */
|
|
TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
|
|
if ((log_getverbose() == 2) && !sym->used)
|
|
fprintf(stderr, "warning: macro '%s' not used\n",
|
|
sym->nam);
|
|
if (!sym->persist) {
|
|
free(sym->nam);
|
|
free(sym->val);
|
|
TAILQ_REMOVE(&symhead, sym, entry);
|
|
free(sym);
|
|
}
|
|
}
|
|
|
|
if (errors) {
|
|
config_clear(conf);
|
|
return (NULL);
|
|
}
|
|
|
|
return (conf);
|
|
}
|
|
|
|
int
|
|
symset(const char *nam, const char *val, int persist)
|
|
{
|
|
struct sym *sym;
|
|
|
|
TAILQ_FOREACH(sym, &symhead, entry) {
|
|
if (strcmp(nam, sym->nam) == 0)
|
|
break;
|
|
}
|
|
|
|
if (sym != NULL) {
|
|
if (sym->persist == 1)
|
|
return (0);
|
|
else {
|
|
free(sym->nam);
|
|
free(sym->val);
|
|
TAILQ_REMOVE(&symhead, sym, entry);
|
|
free(sym);
|
|
}
|
|
}
|
|
if ((sym = calloc(1, sizeof(*sym))) == NULL)
|
|
return (-1);
|
|
|
|
sym->nam = strdup(nam);
|
|
if (sym->nam == NULL) {
|
|
free(sym);
|
|
return (-1);
|
|
}
|
|
sym->val = strdup(val);
|
|
if (sym->val == NULL) {
|
|
free(sym->nam);
|
|
free(sym);
|
|
return (-1);
|
|
}
|
|
sym->used = 0;
|
|
sym->persist = persist;
|
|
TAILQ_INSERT_TAIL(&symhead, sym, entry);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
cmdline_symset(char *s)
|
|
{
|
|
char *sym, *val;
|
|
int ret;
|
|
|
|
if ((val = strrchr(s, '=')) == NULL)
|
|
return (-1);
|
|
sym = strndup(s, val - s);
|
|
if (sym == NULL)
|
|
errx(1, "%s: strndup", __func__);
|
|
ret = symset(sym, val + 1, 1);
|
|
free(sym);
|
|
|
|
return (ret);
|
|
}
|
|
|
|
char *
|
|
symget(const char *nam)
|
|
{
|
|
struct sym *sym;
|
|
|
|
TAILQ_FOREACH(sym, &symhead, entry) {
|
|
if (strcmp(nam, sym->nam) == 0) {
|
|
sym->used = 1;
|
|
return (sym->val);
|
|
}
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
struct iface_conf *
|
|
conf_get_iface(char *name)
|
|
{
|
|
struct iface_conf *iface;
|
|
size_t n;
|
|
|
|
SIMPLEQ_FOREACH(iface, &conf->iface_list, entry) {
|
|
if (strcmp(name, iface->name) == 0)
|
|
return (iface);
|
|
}
|
|
|
|
iface = calloc(1, sizeof(*iface));
|
|
if (iface == NULL)
|
|
errx(1, "%s: calloc", __func__);
|
|
n = strlcpy(iface->name, name, sizeof(iface->name));
|
|
if (n >= sizeof(iface->name))
|
|
errx(1, "%s: name too long", __func__);
|
|
|
|
|
|
SIMPLEQ_INSERT_TAIL(&conf->iface_list, iface, entry);
|
|
|
|
return (iface);
|
|
}
|