%{
/*
* configlexer.lex - lexical analyzer for unbound config file
*
* Copyright (c) 2001-2006, NLnet Labs. All rights reserved
*
* See LICENSE for the license.
*
*/
#include <ctype.h>
#include <string.h>
#include <strings.h>
#ifdef HAVE_GLOB_H
# include <glob.h>
#endif
#include "util/config_file.h"
#include "util/configparser.h"
void ub_c_error(const char *message);
#if 0
#define LEXOUT(s) printf s /* used ONLY when debugging */
#else
#define LEXOUT(s)
#endif
/** avoid warning in about fwrite return value */
#define ECHO ub_c_error_msg("syntax error at text: %s", yytext)
/** A parser variable, this is a statement in the config file which is
* of the form variable: value1 value2 ... nargs is the number of values. */
#define YDVAR(nargs, var) \
num_args=(nargs); \
LEXOUT(("v(%s%d) ", yytext, num_args)); \
if(num_args > 0) { BEGIN(val); } \
return (var);
struct inc_state {
char* filename;
int line;
YY_BUFFER_STATE buffer;
struct inc_state* next;
};
static struct inc_state* config_include_stack = NULL;
static int inc_depth = 0;
static int inc_prev = 0;
static int num_args = 0;
void init_cfg_parse(void)
{
config_include_stack = NULL;
inc_depth = 0;
inc_prev = 0;
num_args = 0;
}
static void config_start_include(const char* filename)
{
FILE *input;
struct inc_state* s;
char* nm;
if(inc_depth++ > 100000) {
ub_c_error_msg("too many include files");
return;
}
if(strlen(filename) == 0) {
ub_c_error_msg("empty include file name");
return;
}
s = (struct inc_state*)malloc(sizeof(*s));
if(!s) {
ub_c_error_msg("include %s: malloc failure", filename);
return;
}
if(cfg_parser->chroot && strncmp(filename, cfg_parser->chroot,
strlen(cfg_parser->chroot)) == 0) {
filename += strlen(cfg_parser->chroot);
}
nm = strdup(filename);
if(!nm) {
ub_c_error_msg("include %s: strdup failure", filename);
free(s);
return;
}
input = fopen(filename, "r");
if(!input) {
ub_c_error_msg("cannot open include file '%s': %s",
filename, strerror(errno));
free(s);
free(nm);
return;
}
LEXOUT(("switch_to_include_file(%s)\n", filename));
s->filename = cfg_parser->filename;
s->line = cfg_parser->line;
s->buffer = YY_CURRENT_BUFFER;
s->next = config_include_stack;
config_include_stack = s;
cfg_parser->filename = nm;
cfg_parser->line = 1;
yy_switch_to_buffer(yy_create_buffer(input, YY_BUF_SIZE));
}
static void config_start_include_glob(const char* filename)
{
/* check for wildcards */
#ifdef HAVE_GLOB
glob_t g;
size_t i;
int r, flags;
if(!(!strchr(filename, '*') && !strchr(filename, '?') && !strchr(filename, '[') &&
!strchr(filename, '{') && !strchr(filename, '~'))) {
flags = 0
#ifdef GLOB_ERR
| GLOB_ERR
#endif
#ifdef GLOB_NOSORT
| GLOB_NOSORT
#endif
#ifdef GLOB_BRACE
| GLOB_BRACE
#endif
#ifdef GLOB_TILDE
| GLOB_TILDE
#endif
;
memset(&g, 0, sizeof(g));
r = glob(filename, flags, NULL, &g);
if(r) {
/* some error */
globfree(&g);
if(r == GLOB_NOMATCH)
return; /* no matches for pattern */
config_start_include(filename); /* let original deal with it */
return;
}
/* process files found, if any */
for(i=0; i<(size_t)g.gl_pathc; i++) {
config_start_include(g.gl_pathv[i]);
}
globfree(&g);
return;
}
#endif /* HAVE_GLOB */
config_start_include(filename);
}
static void config_end_include(void)
{
struct inc_state* s = config_include_stack;
--inc_depth;
if(!s) return;
free(cfg_parser->filename);
cfg_parser->filename = s->filename;
cfg_parser->line = s->line;
yy_delete_buffer(YY_CURRENT_BUFFER);
yy_switch_to_buffer(s->buffer);
config_include_stack = s->next;
free(s);
}
#ifndef yy_set_bol /* compat definition, for flex 2.4.6 */
#define yy_set_bol(at_bol) \
{ \
if ( ! yy_current_buffer ) \
yy_current_buffer = yy_create_buffer( yyin, YY_BUF_SIZE ); \
yy_current_buffer->yy_ch_buf[0] = ((at_bol)?'\n':' '); \
}
#endif
%}
%option noinput
%option nounput
%{
#ifndef YY_NO_UNPUT
#define YY_NO_UNPUT 1
#endif
#ifndef YY_NO_INPUT
#define YY_NO_INPUT 1
#endif
%}
SPACE [ \t]
LETTER [a-zA-Z]
UNQUOTEDLETTER [^\'\"\n\r \t\\]|\\.
UNQUOTEDLETTER_NOCOLON [^\:\'\"\n\r \t\\]|\\.
NEWLINE [\r\n]
COMMENT \#
COLON \:
DQANY [^\"\n\r\\]|\\.
SQANY [^\'\n\r\\]|\\.
%x quotedstring singlequotedstr include include_quoted val
%%
<INITIAL,val>{SPACE}* {
LEXOUT(("SP ")); /* ignore */ }
<INITIAL,val>{SPACE}*{COMMENT}.* {
/* note that flex makes the longest match and '.' is any but not nl */
LEXOUT(("comment(%s) ", yytext)); /* ignore */ }
server{COLON} { YDVAR(0, VAR_SERVER) }
num-threads{COLON} { YDVAR(1, VAR_NUM_THREADS) }
verbosity{COLON} { YDVAR(1, VAR_VERBOSITY) }
port{COLON} { YDVAR(1, VAR_PORT) }
outgoing-range{COLON} { YDVAR(1, VAR_OUTGOING_RANGE) }
outgoing-port-permit{COLON} { YDVAR(1, VAR_OUTGOING_PORT_PERMIT) }
outgoing-port-avoid{COLON} { YDVAR(1, VAR_OUTGOING_PORT_AVOID) }
outgoing-num-tcp{COLON} { YDVAR(1, VAR_OUTGOING_NUM_TCP) }
incoming-num-tcp{COLON} { YDVAR(1, VAR_INCOMING_NUM_TCP) }
do-ip4{COLON} { YDVAR(1, VAR_DO_IP4) }
do-ip6{COLON} { YDVAR(1, VAR_DO_IP6) }
do-udp{COLON} { YDVAR(1, VAR_DO_UDP) }
do-tcp{COLON} { YDVAR(1, VAR_DO_TCP) }
tcp-upstream{COLON} { YDVAR(1, VAR_TCP_UPSTREAM) }
ssl-upstream{COLON} { YDVAR(1, VAR_SSL_UPSTREAM) }
ssl-service-key{COLON} { YDVAR(1, VAR_SSL_SERVICE_KEY) }
ssl-service-pem{COLON} { YDVAR(1, VAR_SSL_SERVICE_PEM) }
ssl-port{COLON} { YDVAR(1, VAR_SSL_PORT) }
do-daemonize{COLON} { YDVAR(1, VAR_DO_DAEMONIZE) }
interface{COLON} { YDVAR(1, VAR_INTERFACE) }
ip-address{COLON} { YDVAR(1, VAR_INTERFACE) }
outgoing-interface{COLON} { YDVAR(1, VAR_OUTGOING_INTERFACE) }
interface-automatic{COLON} { YDVAR(1, VAR_INTERFACE_AUTOMATIC) }
so-rcvbuf{COLON} { YDVAR(1, VAR_SO_RCVBUF) }
so-sndbuf{COLON} { YDVAR(1, VAR_SO_SNDBUF) }
so-reuseport{COLON} { YDVAR(1, VAR_SO_REUSEPORT) }
ip-transparent{COLON} { YDVAR(1, VAR_IP_TRANSPARENT) }
chroot{COLON} { YDVAR(1, VAR_CHROOT) }
username{COLON} { YDVAR(1, VAR_USERNAME) }
directory{COLON} { YDVAR(1, VAR_DIRECTORY) }
logfile{COLON} { YDVAR(1, VAR_LOGFILE) }
pidfile{COLON} { YDVAR(1, VAR_PIDFILE) }
root-hints{COLON} { YDVAR(1, VAR_ROOT_HINTS) }
edns-buffer-size{COLON} { YDVAR(1, VAR_EDNS_BUFFER_SIZE) }
msg-buffer-size{COLON} { YDVAR(1, VAR_MSG_BUFFER_SIZE) }
msg-cache-size{COLON} { YDVAR(1, VAR_MSG_CACHE_SIZE) }
msg-cache-slabs{COLON} { YDVAR(1, VAR_MSG_CACHE_SLABS) }
rrset-cache-size{COLON} { YDVAR(1, VAR_RRSET_CACHE_SIZE) }
rrset-cache-slabs{COLON} { YDVAR(1, VAR_RRSET_CACHE_SLABS) }
cache-max-ttl{COLON} { YDVAR(1, VAR_CACHE_MAX_TTL) }
cache-min-ttl{COLON} { YDVAR(1, VAR_CACHE_MIN_TTL) }
infra-host-ttl{COLON} { YDVAR(1, VAR_INFRA_HOST_TTL) }
infra-lame-ttl{COLON} { YDVAR(1, VAR_INFRA_LAME_TTL) }
infra-cache-slabs{COLON} { YDVAR(1, VAR_INFRA_CACHE_SLABS) }
infra-cache-numhosts{COLON} { YDVAR(1, VAR_INFRA_CACHE_NUMHOSTS) }
infra-cache-lame-size{COLON} { YDVAR(1, VAR_INFRA_CACHE_LAME_SIZE) }
infra-cache-min-rtt{COLON} { YDVAR(1, VAR_INFRA_CACHE_MIN_RTT) }
num-queries-per-thread{COLON} { YDVAR(1, VAR_NUM_QUERIES_PER_THREAD) }
jostle-timeout{COLON} { YDVAR(1, VAR_JOSTLE_TIMEOUT) }
delay-close{COLON} { YDVAR(1, VAR_DELAY_CLOSE) }
target-fetch-policy{COLON} { YDVAR(1, VAR_TARGET_FETCH_POLICY) }
harden-short-bufsize{COLON} { YDVAR(1, VAR_HARDEN_SHORT_BUFSIZE) }
harden-large-queries{COLON} { YDVAR(1, VAR_HARDEN_LARGE_QUERIES) }
harden-glue{COLON} { YDVAR(1, VAR_HARDEN_GLUE) }
harden-dnssec-stripped{COLON} { YDVAR(1, VAR_HARDEN_DNSSEC_STRIPPED) }
harden-below-nxdomain{COLON} { YDVAR(1, VAR_HARDEN_BELOW_NXDOMAIN) }
harden-referral-path{COLON} { YDVAR(1, VAR_HARDEN_REFERRAL_PATH) }
harden-algo-downgrade{COLON} { YDVAR(1, VAR_HARDEN_ALGO_DOWNGRADE) }
use-caps-for-id{COLON} { YDVAR(1, VAR_USE_CAPS_FOR_ID) }
unwanted-reply-threshold{COLON} { YDVAR(1, VAR_UNWANTED_REPLY_THRESHOLD) }
private-address{COLON} { YDVAR(1, VAR_PRIVATE_ADDRESS) }
private-domain{COLON} { YDVAR(1, VAR_PRIVATE_DOMAIN) }
prefetch-key{COLON} { YDVAR(1, VAR_PREFETCH_KEY) }
prefetch{COLON} { YDVAR(1, VAR_PREFETCH) }
stub-zone{COLON} { YDVAR(0, VAR_STUB_ZONE) }
name{COLON} { YDVAR(1, VAR_NAME) }
stub-addr{COLON} { YDVAR(1, VAR_STUB_ADDR) }
stub-host{COLON} { YDVAR(1, VAR_STUB_HOST) }
stub-prime{COLON} { YDVAR(1, VAR_STUB_PRIME) }
stub-first{COLON} { YDVAR(1, VAR_STUB_FIRST) }
forward-zone{COLON} { YDVAR(0, VAR_FORWARD_ZONE) }
forward-addr{COLON} { YDVAR(1, VAR_FORWARD_ADDR) }
forward-host{COLON} { YDVAR(1, VAR_FORWARD_HOST) }
forward-first{COLON} { YDVAR(1, VAR_FORWARD_FIRST) }
do-not-query-address{COLON} { YDVAR(1, VAR_DO_NOT_QUERY_ADDRESS) }
do-not-query-localhost{COLON} { YDVAR(1, VAR_DO_NOT_QUERY_LOCALHOST) }
access-control{COLON} { YDVAR(2, VAR_ACCESS_CONTROL) }
hide-identity{COLON} { YDVAR(1, VAR_HIDE_IDENTITY) }
hide-version{COLON} { YDVAR(1, VAR_HIDE_VERSION) }
identity{COLON} { YDVAR(1, VAR_IDENTITY) }
version{COLON} { YDVAR(1, VAR_VERSION) }
module-config{COLON} { YDVAR(1, VAR_MODULE_CONF) }
dlv-anchor{COLON} { YDVAR(1, VAR_DLV_ANCHOR) }
dlv-anchor-file{COLON} { YDVAR(1, VAR_DLV_ANCHOR_FILE) }
trust-anchor-file{COLON} { YDVAR(1, VAR_TRUST_ANCHOR_FILE) }
auto-trust-anchor-file{COLON} { YDVAR(1, VAR_AUTO_TRUST_ANCHOR_FILE) }
trusted-keys-file{COLON} { YDVAR(1, VAR_TRUSTED_KEYS_FILE) }
trust-anchor{COLON} { YDVAR(1, VAR_TRUST_ANCHOR) }
val-override-date{COLON} { YDVAR(1, VAR_VAL_OVERRIDE_DATE) }
val-sig-skew-min{COLON} { YDVAR(1, VAR_VAL_SIG_SKEW_MIN) }
val-sig-skew-max{COLON} { YDVAR(1, VAR_VAL_SIG_SKEW_MAX) }
val-bogus-ttl{COLON} { YDVAR(1, VAR_BOGUS_TTL) }
val-clean-additional{COLON} { YDVAR(1, VAR_VAL_CLEAN_ADDITIONAL) }
val-permissive-mode{COLON} { YDVAR(1, VAR_VAL_PERMISSIVE_MODE) }
ignore-cd-flag{COLON} { YDVAR(1, VAR_IGNORE_CD_FLAG) }
val-log-level{COLON} { YDVAR(1, VAR_VAL_LOG_LEVEL) }
key-cache-size{COLON} { YDVAR(1, VAR_KEY_CACHE_SIZE) }
key-cache-slabs{COLON} { YDVAR(1, VAR_KEY_CACHE_SLABS) }
neg-cache-size{COLON} { YDVAR(1, VAR_NEG_CACHE_SIZE) }
val-nsec3-keysize-iterations{COLON} {
YDVAR(1, VAR_VAL_NSEC3_KEYSIZE_ITERATIONS) }
add-holddown{COLON} { YDVAR(1, VAR_ADD_HOLDDOWN) }
del-holddown{COLON} { YDVAR(1, VAR_DEL_HOLDDOWN) }
keep-missing{COLON} { YDVAR(1, VAR_KEEP_MISSING) }
use-syslog{COLON} { YDVAR(1, VAR_USE_SYSLOG) }
log-time-ascii{COLON} { YDVAR(1, VAR_LOG_TIME_ASCII) }
log-queries{COLON} { YDVAR(1, VAR_LOG_QUERIES) }
local-zone{COLON} { YDVAR(2, VAR_LOCAL_ZONE) }
local-data{COLON} { YDVAR(1, VAR_LOCAL_DATA) }
local-data-ptr{COLON} { YDVAR(1, VAR_LOCAL_DATA_PTR) }
unblock-lan-zones{COLON} { YDVAR(1, VAR_UNBLOCK_LAN_ZONES) }
statistics-interval{COLON} { YDVAR(1, VAR_STATISTICS_INTERVAL) }
statistics-cumulative{COLON} { YDVAR(1, VAR_STATISTICS_CUMULATIVE) }
extended-statistics{COLON} { YDVAR(1, VAR_EXTENDED_STATISTICS) }
remote-control{COLON} { YDVAR(0, VAR_REMOTE_CONTROL) }
control-enable{COLON} { YDVAR(1, VAR_CONTROL_ENABLE) }
control-interface{COLON} { YDVAR(1, VAR_CONTROL_INTERFACE) }
control-port{COLON} { YDVAR(1, VAR_CONTROL_PORT) }
control-use-cert{COLON} { YDVAR(1, VAR_CONTROL_USE_CERT) }
server-key-file{COLON} { YDVAR(1, VAR_SERVER_KEY_FILE) }
server-cert-file{COLON} { YDVAR(1, VAR_SERVER_CERT_FILE) }
control-key-file{COLON} { YDVAR(1, VAR_CONTROL_KEY_FILE) }
control-cert-file{COLON} { YDVAR(1, VAR_CONTROL_CERT_FILE) }
python-script{COLON} { YDVAR(1, VAR_PYTHON_SCRIPT) }
python{COLON} { YDVAR(0, VAR_PYTHON) }
domain-insecure{COLON} { YDVAR(1, VAR_DOMAIN_INSECURE) }
minimal-responses{COLON} { YDVAR(1, VAR_MINIMAL_RESPONSES) }
rrset-roundrobin{COLON} { YDVAR(1, VAR_RRSET_ROUNDROBIN) }
max-udp-size{COLON} { YDVAR(1, VAR_MAX_UDP_SIZE) }
dns64-prefix{COLON} { YDVAR(1, VAR_DNS64_PREFIX) }
dns64-synthall{COLON} { YDVAR(1, VAR_DNS64_SYNTHALL) }
dnstap{COLON} { YDVAR(0, VAR_DNSTAP) }
dnstap-enable{COLON} { YDVAR(1, VAR_DNSTAP_ENABLE) }
dnstap-socket-path{COLON} { YDVAR(1, VAR_DNSTAP_SOCKET_PATH) }
dnstap-send-identity{COLON} { YDVAR(1, VAR_DNSTAP_SEND_IDENTITY) }
dnstap-send-version{COLON} { YDVAR(1, VAR_DNSTAP_SEND_VERSION) }
dnstap-identity{COLON} { YDVAR(1, VAR_DNSTAP_IDENTITY) }
dnstap-version{COLON} { YDVAR(1, VAR_DNSTAP_VERSION) }
dnstap-log-resolver-query-messages{COLON} {
YDVAR(1, VAR_DNSTAP_LOG_RESOLVER_QUERY_MESSAGES) }
dnstap-log-resolver-response-messages{COLON} {
YDVAR(1, VAR_DNSTAP_LOG_RESOLVER_RESPONSE_MESSAGES) }
dnstap-log-client-query-messages{COLON} {
YDVAR(1, VAR_DNSTAP_LOG_CLIENT_QUERY_MESSAGES) }
dnstap-log-client-response-messages{COLON} {
YDVAR(1, VAR_DNSTAP_LOG_CLIENT_RESPONSE_MESSAGES) }
dnstap-log-forwarder-query-messages{COLON} {
YDVAR(1, VAR_DNSTAP_LOG_FORWARDER_QUERY_MESSAGES) }
dnstap-log-forwarder-response-messages{COLON} {
YDVAR(1, VAR_DNSTAP_LOG_FORWARDER_RESPONSE_MESSAGES) }
<INITIAL,val>{NEWLINE} { LEXOUT(("NL\n")); cfg_parser->line++; }
/* Quoted strings. Strip leading and ending quotes */
<val>\" { BEGIN(quotedstring); LEXOUT(("QS ")); }
<quotedstring><<EOF>> {
yyerror("EOF inside quoted string");
if(--num_args == 0) { BEGIN(INITIAL); }
else { BEGIN(val); }
}
<quotedstring>{DQANY}* { LEXOUT(("STR(%s) ", yytext)); yymore(); }
<quotedstring>{NEWLINE} { yyerror("newline inside quoted string, no end \"");
cfg_parser->line++; BEGIN(INITIAL); }
<quotedstring>\" {
LEXOUT(("QE "));
if(--num_args == 0) { BEGIN(INITIAL); }
else { BEGIN(val); }
yytext[yyleng - 1] = '\0';
yylval.str = strdup(yytext);
if(!yylval.str)
yyerror("out of memory");
return STRING_ARG;
}
/* Single Quoted strings. Strip leading and ending quotes */
<val>\' { BEGIN(singlequotedstr); LEXOUT(("SQS ")); }
<singlequotedstr><<EOF>> {
yyerror("EOF inside quoted string");
if(--num_args == 0) { BEGIN(INITIAL); }
else { BEGIN(val); }
}
<singlequotedstr>{SQANY}* { LEXOUT(("STR(%s) ", yytext)); yymore(); }
<singlequotedstr>{NEWLINE} { yyerror("newline inside quoted string, no end '");
cfg_parser->line++; BEGIN(INITIAL); }
<singlequotedstr>\' {
LEXOUT(("SQE "));
if(--num_args == 0) { BEGIN(INITIAL); }
else { BEGIN(val); }
yytext[yyleng - 1] = '\0';
yylval.str = strdup(yytext);
if(!yylval.str)
yyerror("out of memory");
return STRING_ARG;
}
/* include: directive */
<INITIAL,val>include{COLON} {
LEXOUT(("v(%s) ", yytext)); inc_prev = YYSTATE; BEGIN(include); }
<include><<EOF>> {
yyerror("EOF inside include directive");
BEGIN(inc_prev);
}
<include>{SPACE}* { LEXOUT(("ISP ")); /* ignore */ }
<include>{NEWLINE} { LEXOUT(("NL\n")); cfg_parser->line++;}
<include>\" { LEXOUT(("IQS ")); BEGIN(include_quoted); }
<include>{UNQUOTEDLETTER}* {
LEXOUT(("Iunquotedstr(%s) ", yytext));
config_start_include_glob(yytext);
BEGIN(inc_prev);
}
<include_quoted><<EOF>> {
yyerror("EOF inside quoted string");
BEGIN(inc_prev);
}
<include_quoted>{DQANY}* { LEXOUT(("ISTR(%s) ", yytext)); yymore(); }
<include_quoted>{NEWLINE} { yyerror("newline before \" in include name");
cfg_parser->line++; BEGIN(inc_prev); }
<include_quoted>\" {
LEXOUT(("IQE "));
yytext[yyleng - 1] = '\0';
config_start_include_glob(yytext);
BEGIN(inc_prev);
}
<INITIAL,val><<EOF>> {
LEXOUT(("LEXEOF "));
yy_set_bol(1); /* Set beginning of line, so "^" rules match. */
if (!config_include_stack) {
yyterminate();
} else {
fclose(yyin);
config_end_include();
}
}
<val>{UNQUOTEDLETTER}* { LEXOUT(("unquotedstr(%s) ", yytext));
if(--num_args == 0) { BEGIN(INITIAL); }
yylval.str = strdup(yytext); return STRING_ARG; }
{UNQUOTEDLETTER_NOCOLON}* {
ub_c_error_msg("unknown keyword '%s'", yytext);
}
<*>. {
ub_c_error_msg("stray '%s'", yytext);
}
%%
