3 * configlexer.lex - lexical analyzer for unbound config file
5 * Copyright (c) 2001-2006, NLnet Labs. All rights reserved
7 * See LICENSE for the license.
19 #include "util/config_file.h"
20 #include "configparser.h"
21 void ub_c_error(const char *message);
24 #define LEXOUT(s) printf s /* used ONLY when debugging */
29 /** avoid warning in about fwrite return value */
30 #define ECHO ub_c_error_msg("syntax error at text: %s", ub_c_text)
32 /** A parser variable, this is a statement in the config file which is
33 * of the form variable: value1 value2 ... nargs is the number of values. */
34 #define YDVAR(nargs, var) \
36 LEXOUT(("v(%s%d) ", ub_c_text, num_args)); \
37 if(num_args > 0) { BEGIN(val); } \
43 YY_BUFFER_STATE buffer;
44 struct inc_state* next;
46 static struct inc_state* config_include_stack = NULL;
47 static int inc_depth = 0;
48 static int inc_prev = 0;
49 static int num_args = 0;
51 void init_cfg_parse(void)
53 config_include_stack = NULL;
59 static void config_start_include(const char* filename)
64 if(inc_depth++ > 100000) {
65 ub_c_error_msg("too many include files");
68 if(strlen(filename) == 0) {
69 ub_c_error_msg("empty include file name");
72 s = (struct inc_state*)malloc(sizeof(*s));
74 ub_c_error_msg("include %s: malloc failure", filename);
77 if(cfg_parser->chroot && strncmp(filename, cfg_parser->chroot,
78 strlen(cfg_parser->chroot)) == 0) {
79 filename += strlen(cfg_parser->chroot);
81 nm = strdup(filename);
83 ub_c_error_msg("include %s: strdup failure", filename);
87 input = fopen(filename, "r");
89 ub_c_error_msg("cannot open include file '%s': %s",
90 filename, strerror(errno));
95 LEXOUT(("switch_to_include_file(%s)\n", filename));
96 s->filename = cfg_parser->filename;
97 s->line = cfg_parser->line;
98 s->buffer = YY_CURRENT_BUFFER;
99 s->next = config_include_stack;
100 config_include_stack = s;
101 cfg_parser->filename = nm;
102 cfg_parser->line = 1;
103 yy_switch_to_buffer(yy_create_buffer(input, YY_BUF_SIZE));
106 static void config_start_include_glob(const char* filename)
109 /* check for wildcards */
114 if(!(!strchr(filename, '*') && !strchr(filename, '?') && !strchr(filename, '[') &&
115 !strchr(filename, '{') && !strchr(filename, '~'))) {
130 memset(&g, 0, sizeof(g));
131 r = glob(filename, flags, NULL, &g);
135 if(r == GLOB_NOMATCH)
136 return; /* no matches for pattern */
137 config_start_include(filename); /* let original deal with it */
140 /* process files found, if any */
141 for(i=0; i<(size_t)g.gl_pathc; i++) {
142 config_start_include(g.gl_pathv[i]);
147 #endif /* HAVE_GLOB */
149 config_start_include(filename);
152 static void config_end_include(void)
154 struct inc_state* s = config_include_stack;
157 free(cfg_parser->filename);
158 cfg_parser->filename = s->filename;
159 cfg_parser->line = s->line;
160 yy_delete_buffer(YY_CURRENT_BUFFER);
161 yy_switch_to_buffer(s->buffer);
162 config_include_stack = s->next;
166 #ifndef yy_set_bol /* compat definition, for flex 2.4.6 */
167 #define yy_set_bol(at_bol) \
169 if ( ! yy_current_buffer ) \
170 yy_current_buffer = yy_create_buffer( ub_c_in, YY_BUF_SIZE ); \
171 yy_current_buffer->yy_ch_buf[0] = ((at_bol)?'\n':' '); \
180 #define YY_NO_UNPUT 1
183 #define YY_NO_INPUT 1
189 UNQUOTEDLETTER [^\'\"\n\r \t\\]|\\.
190 UNQUOTEDLETTER_NOCOLON [^\:\'\"\n\r \t\\]|\\.
194 DQANY [^\"\n\r\\]|\\.
195 SQANY [^\'\n\r\\]|\\.
197 %x quotedstring singlequotedstr include include_quoted val
200 <INITIAL,val>{SPACE}* {
201 LEXOUT(("SP ")); /* ignore */ }
202 <INITIAL,val>{SPACE}*{COMMENT}.* {
203 /* note that flex makes the longest match and '.' is any but not nl */
204 LEXOUT(("comment(%s) ", ub_c_text)); /* ignore */ }
205 server{COLON} { YDVAR(0, VAR_SERVER) }
206 num-threads{COLON} { YDVAR(1, VAR_NUM_THREADS) }
207 verbosity{COLON} { YDVAR(1, VAR_VERBOSITY) }
208 port{COLON} { YDVAR(1, VAR_PORT) }
209 outgoing-range{COLON} { YDVAR(1, VAR_OUTGOING_RANGE) }
210 outgoing-port-permit{COLON} { YDVAR(1, VAR_OUTGOING_PORT_PERMIT) }
211 outgoing-port-avoid{COLON} { YDVAR(1, VAR_OUTGOING_PORT_AVOID) }
212 outgoing-num-tcp{COLON} { YDVAR(1, VAR_OUTGOING_NUM_TCP) }
213 incoming-num-tcp{COLON} { YDVAR(1, VAR_INCOMING_NUM_TCP) }
214 do-ip4{COLON} { YDVAR(1, VAR_DO_IP4) }
215 do-ip6{COLON} { YDVAR(1, VAR_DO_IP6) }
216 do-udp{COLON} { YDVAR(1, VAR_DO_UDP) }
217 do-tcp{COLON} { YDVAR(1, VAR_DO_TCP) }
218 tcp-upstream{COLON} { YDVAR(1, VAR_TCP_UPSTREAM) }
219 ssl-upstream{COLON} { YDVAR(1, VAR_SSL_UPSTREAM) }
220 ssl-service-key{COLON} { YDVAR(1, VAR_SSL_SERVICE_KEY) }
221 ssl-service-pem{COLON} { YDVAR(1, VAR_SSL_SERVICE_PEM) }
222 ssl-port{COLON} { YDVAR(1, VAR_SSL_PORT) }
223 do-daemonize{COLON} { YDVAR(1, VAR_DO_DAEMONIZE) }
224 interface{COLON} { YDVAR(1, VAR_INTERFACE) }
225 ip-address{COLON} { YDVAR(1, VAR_INTERFACE) }
226 outgoing-interface{COLON} { YDVAR(1, VAR_OUTGOING_INTERFACE) }
227 interface-automatic{COLON} { YDVAR(1, VAR_INTERFACE_AUTOMATIC) }
228 so-rcvbuf{COLON} { YDVAR(1, VAR_SO_RCVBUF) }
229 so-sndbuf{COLON} { YDVAR(1, VAR_SO_SNDBUF) }
230 so-reuseport{COLON} { YDVAR(1, VAR_SO_REUSEPORT) }
231 chroot{COLON} { YDVAR(1, VAR_CHROOT) }
232 username{COLON} { YDVAR(1, VAR_USERNAME) }
233 directory{COLON} { YDVAR(1, VAR_DIRECTORY) }
234 logfile{COLON} { YDVAR(1, VAR_LOGFILE) }
235 pidfile{COLON} { YDVAR(1, VAR_PIDFILE) }
236 root-hints{COLON} { YDVAR(1, VAR_ROOT_HINTS) }
237 edns-buffer-size{COLON} { YDVAR(1, VAR_EDNS_BUFFER_SIZE) }
238 msg-buffer-size{COLON} { YDVAR(1, VAR_MSG_BUFFER_SIZE) }
239 msg-cache-size{COLON} { YDVAR(1, VAR_MSG_CACHE_SIZE) }
240 msg-cache-slabs{COLON} { YDVAR(1, VAR_MSG_CACHE_SLABS) }
241 rrset-cache-size{COLON} { YDVAR(1, VAR_RRSET_CACHE_SIZE) }
242 rrset-cache-slabs{COLON} { YDVAR(1, VAR_RRSET_CACHE_SLABS) }
243 cache-max-ttl{COLON} { YDVAR(1, VAR_CACHE_MAX_TTL) }
244 cache-min-ttl{COLON} { YDVAR(1, VAR_CACHE_MIN_TTL) }
245 infra-host-ttl{COLON} { YDVAR(1, VAR_INFRA_HOST_TTL) }
246 infra-lame-ttl{COLON} { YDVAR(1, VAR_INFRA_LAME_TTL) }
247 infra-cache-slabs{COLON} { YDVAR(1, VAR_INFRA_CACHE_SLABS) }
248 infra-cache-numhosts{COLON} { YDVAR(1, VAR_INFRA_CACHE_NUMHOSTS) }
249 infra-cache-lame-size{COLON} { YDVAR(1, VAR_INFRA_CACHE_LAME_SIZE) }
250 infra-cache-min-rtt{COLON} { YDVAR(1, VAR_INFRA_CACHE_MIN_RTT) }
251 num-queries-per-thread{COLON} { YDVAR(1, VAR_NUM_QUERIES_PER_THREAD) }
252 jostle-timeout{COLON} { YDVAR(1, VAR_JOSTLE_TIMEOUT) }
253 delay-close{COLON} { YDVAR(1, VAR_DELAY_CLOSE) }
254 target-fetch-policy{COLON} { YDVAR(1, VAR_TARGET_FETCH_POLICY) }
255 harden-short-bufsize{COLON} { YDVAR(1, VAR_HARDEN_SHORT_BUFSIZE) }
256 harden-large-queries{COLON} { YDVAR(1, VAR_HARDEN_LARGE_QUERIES) }
257 harden-glue{COLON} { YDVAR(1, VAR_HARDEN_GLUE) }
258 harden-dnssec-stripped{COLON} { YDVAR(1, VAR_HARDEN_DNSSEC_STRIPPED) }
259 harden-below-nxdomain{COLON} { YDVAR(1, VAR_HARDEN_BELOW_NXDOMAIN) }
260 harden-referral-path{COLON} { YDVAR(1, VAR_HARDEN_REFERRAL_PATH) }
261 use-caps-for-id{COLON} { YDVAR(1, VAR_USE_CAPS_FOR_ID) }
262 unwanted-reply-threshold{COLON} { YDVAR(1, VAR_UNWANTED_REPLY_THRESHOLD) }
263 private-address{COLON} { YDVAR(1, VAR_PRIVATE_ADDRESS) }
264 private-domain{COLON} { YDVAR(1, VAR_PRIVATE_DOMAIN) }
265 prefetch-key{COLON} { YDVAR(1, VAR_PREFETCH_KEY) }
266 prefetch{COLON} { YDVAR(1, VAR_PREFETCH) }
267 stub-zone{COLON} { YDVAR(0, VAR_STUB_ZONE) }
268 name{COLON} { YDVAR(1, VAR_NAME) }
269 stub-addr{COLON} { YDVAR(1, VAR_STUB_ADDR) }
270 stub-host{COLON} { YDVAR(1, VAR_STUB_HOST) }
271 stub-prime{COLON} { YDVAR(1, VAR_STUB_PRIME) }
272 stub-first{COLON} { YDVAR(1, VAR_STUB_FIRST) }
273 forward-zone{COLON} { YDVAR(0, VAR_FORWARD_ZONE) }
274 forward-addr{COLON} { YDVAR(1, VAR_FORWARD_ADDR) }
275 forward-host{COLON} { YDVAR(1, VAR_FORWARD_HOST) }
276 forward-first{COLON} { YDVAR(1, VAR_FORWARD_FIRST) }
277 do-not-query-address{COLON} { YDVAR(1, VAR_DO_NOT_QUERY_ADDRESS) }
278 do-not-query-localhost{COLON} { YDVAR(1, VAR_DO_NOT_QUERY_LOCALHOST) }
279 access-control{COLON} { YDVAR(2, VAR_ACCESS_CONTROL) }
280 hide-identity{COLON} { YDVAR(1, VAR_HIDE_IDENTITY) }
281 hide-version{COLON} { YDVAR(1, VAR_HIDE_VERSION) }
282 identity{COLON} { YDVAR(1, VAR_IDENTITY) }
283 version{COLON} { YDVAR(1, VAR_VERSION) }
284 module-config{COLON} { YDVAR(1, VAR_MODULE_CONF) }
285 dlv-anchor{COLON} { YDVAR(1, VAR_DLV_ANCHOR) }
286 dlv-anchor-file{COLON} { YDVAR(1, VAR_DLV_ANCHOR_FILE) }
287 trust-anchor-file{COLON} { YDVAR(1, VAR_TRUST_ANCHOR_FILE) }
288 auto-trust-anchor-file{COLON} { YDVAR(1, VAR_AUTO_TRUST_ANCHOR_FILE) }
289 trusted-keys-file{COLON} { YDVAR(1, VAR_TRUSTED_KEYS_FILE) }
290 trust-anchor{COLON} { YDVAR(1, VAR_TRUST_ANCHOR) }
291 val-override-date{COLON} { YDVAR(1, VAR_VAL_OVERRIDE_DATE) }
292 val-sig-skew-min{COLON} { YDVAR(1, VAR_VAL_SIG_SKEW_MIN) }
293 val-sig-skew-max{COLON} { YDVAR(1, VAR_VAL_SIG_SKEW_MAX) }
294 val-bogus-ttl{COLON} { YDVAR(1, VAR_BOGUS_TTL) }
295 val-clean-additional{COLON} { YDVAR(1, VAR_VAL_CLEAN_ADDITIONAL) }
296 val-permissive-mode{COLON} { YDVAR(1, VAR_VAL_PERMISSIVE_MODE) }
297 ignore-cd-flag{COLON} { YDVAR(1, VAR_IGNORE_CD_FLAG) }
298 val-log-level{COLON} { YDVAR(1, VAR_VAL_LOG_LEVEL) }
299 key-cache-size{COLON} { YDVAR(1, VAR_KEY_CACHE_SIZE) }
300 key-cache-slabs{COLON} { YDVAR(1, VAR_KEY_CACHE_SLABS) }
301 neg-cache-size{COLON} { YDVAR(1, VAR_NEG_CACHE_SIZE) }
302 val-nsec3-keysize-iterations{COLON} {
303 YDVAR(1, VAR_VAL_NSEC3_KEYSIZE_ITERATIONS) }
304 add-holddown{COLON} { YDVAR(1, VAR_ADD_HOLDDOWN) }
305 del-holddown{COLON} { YDVAR(1, VAR_DEL_HOLDDOWN) }
306 keep-missing{COLON} { YDVAR(1, VAR_KEEP_MISSING) }
307 use-syslog{COLON} { YDVAR(1, VAR_USE_SYSLOG) }
308 log-time-ascii{COLON} { YDVAR(1, VAR_LOG_TIME_ASCII) }
309 log-queries{COLON} { YDVAR(1, VAR_LOG_QUERIES) }
310 local-zone{COLON} { YDVAR(2, VAR_LOCAL_ZONE) }
311 local-data{COLON} { YDVAR(1, VAR_LOCAL_DATA) }
312 local-data-ptr{COLON} { YDVAR(1, VAR_LOCAL_DATA_PTR) }
313 unblock-lan-zones{COLON} { YDVAR(1, VAR_UNBLOCK_LAN_ZONES) }
314 statistics-interval{COLON} { YDVAR(1, VAR_STATISTICS_INTERVAL) }
315 statistics-cumulative{COLON} { YDVAR(1, VAR_STATISTICS_CUMULATIVE) }
316 extended-statistics{COLON} { YDVAR(1, VAR_EXTENDED_STATISTICS) }
317 remote-control{COLON} { YDVAR(0, VAR_REMOTE_CONTROL) }
318 control-enable{COLON} { YDVAR(1, VAR_CONTROL_ENABLE) }
319 control-interface{COLON} { YDVAR(1, VAR_CONTROL_INTERFACE) }
320 control-port{COLON} { YDVAR(1, VAR_CONTROL_PORT) }
321 control-use-cert{COLON} { YDVAR(1, VAR_CONTROL_USE_CERT) }
322 server-key-file{COLON} { YDVAR(1, VAR_SERVER_KEY_FILE) }
323 server-cert-file{COLON} { YDVAR(1, VAR_SERVER_CERT_FILE) }
324 control-key-file{COLON} { YDVAR(1, VAR_CONTROL_KEY_FILE) }
325 control-cert-file{COLON} { YDVAR(1, VAR_CONTROL_CERT_FILE) }
326 python-script{COLON} { YDVAR(1, VAR_PYTHON_SCRIPT) }
327 python{COLON} { YDVAR(0, VAR_PYTHON) }
328 domain-insecure{COLON} { YDVAR(1, VAR_DOMAIN_INSECURE) }
329 minimal-responses{COLON} { YDVAR(1, VAR_MINIMAL_RESPONSES) }
330 rrset-roundrobin{COLON} { YDVAR(1, VAR_RRSET_ROUNDROBIN) }
331 max-udp-size{COLON} { YDVAR(1, VAR_MAX_UDP_SIZE) }
332 dns64-prefix{COLON} { YDVAR(1, VAR_DNS64_PREFIX) }
333 dns64-synthall{COLON} { YDVAR(1, VAR_DNS64_SYNTHALL) }
334 dnstap{COLON} { YDVAR(0, VAR_DNSTAP) }
335 dnstap-enable{COLON} { YDVAR(1, VAR_DNSTAP_ENABLE) }
336 dnstap-socket-path{COLON} { YDVAR(1, VAR_DNSTAP_SOCKET_PATH) }
337 dnstap-send-identity{COLON} { YDVAR(1, VAR_DNSTAP_SEND_IDENTITY) }
338 dnstap-send-version{COLON} { YDVAR(1, VAR_DNSTAP_SEND_VERSION) }
339 dnstap-identity{COLON} { YDVAR(1, VAR_DNSTAP_IDENTITY) }
340 dnstap-version{COLON} { YDVAR(1, VAR_DNSTAP_VERSION) }
341 dnstap-log-resolver-query-messages{COLON} {
342 YDVAR(1, VAR_DNSTAP_LOG_RESOLVER_QUERY_MESSAGES) }
343 dnstap-log-resolver-response-messages{COLON} {
344 YDVAR(1, VAR_DNSTAP_LOG_RESOLVER_RESPONSE_MESSAGES) }
345 dnstap-log-client-query-messages{COLON} {
346 YDVAR(1, VAR_DNSTAP_LOG_CLIENT_QUERY_MESSAGES) }
347 dnstap-log-client-response-messages{COLON} {
348 YDVAR(1, VAR_DNSTAP_LOG_CLIENT_RESPONSE_MESSAGES) }
349 dnstap-log-forwarder-query-messages{COLON} {
350 YDVAR(1, VAR_DNSTAP_LOG_FORWARDER_QUERY_MESSAGES) }
351 dnstap-log-forwarder-response-messages{COLON} {
352 YDVAR(1, VAR_DNSTAP_LOG_FORWARDER_RESPONSE_MESSAGES) }
353 <INITIAL,val>{NEWLINE} { LEXOUT(("NL\n")); cfg_parser->line++; }
355 /* Quoted strings. Strip leading and ending quotes */
356 <val>\" { BEGIN(quotedstring); LEXOUT(("QS ")); }
357 <quotedstring><<EOF>> {
358 ub_c_error("EOF inside quoted string");
359 if(--num_args == 0) { BEGIN(INITIAL); }
362 <quotedstring>{DQANY}* { LEXOUT(("STR(%s) ", ub_c_text)); yymore(); }
363 <quotedstring>{NEWLINE} { ub_c_error("newline inside quoted string, no end \"");
364 cfg_parser->line++; BEGIN(INITIAL); }
367 if(--num_args == 0) { BEGIN(INITIAL); }
369 ub_c_text[ub_c_leng - 1] = '\0';
370 ub_c_lval.str = strdup(ub_c_text);
372 ub_c_error("out of memory");
376 /* Single Quoted strings. Strip leading and ending quotes */
377 <val>\' { BEGIN(singlequotedstr); LEXOUT(("SQS ")); }
378 <singlequotedstr><<EOF>> {
379 ub_c_error("EOF inside quoted string");
380 if(--num_args == 0) { BEGIN(INITIAL); }
383 <singlequotedstr>{SQANY}* { LEXOUT(("STR(%s) ", ub_c_text)); yymore(); }
384 <singlequotedstr>{NEWLINE} { ub_c_error("newline inside quoted string, no end '");
385 cfg_parser->line++; BEGIN(INITIAL); }
386 <singlequotedstr>\' {
388 if(--num_args == 0) { BEGIN(INITIAL); }
390 ub_c_text[ub_c_leng - 1] = '\0';
391 ub_c_lval.str = strdup(ub_c_text);
393 ub_c_error("out of memory");
397 /* include: directive */
398 <INITIAL,val>include{COLON} {
399 LEXOUT(("v(%s) ", ub_c_text)); inc_prev = YYSTATE; BEGIN(include); }
401 ub_c_error("EOF inside include directive");
404 <include>{SPACE}* { LEXOUT(("ISP ")); /* ignore */ }
405 <include>{NEWLINE} { LEXOUT(("NL\n")); cfg_parser->line++;}
406 <include>\" { LEXOUT(("IQS ")); BEGIN(include_quoted); }
407 <include>{UNQUOTEDLETTER}* {
408 LEXOUT(("Iunquotedstr(%s) ", ub_c_text));
409 config_start_include_glob(ub_c_text);
412 <include_quoted><<EOF>> {
413 ub_c_error("EOF inside quoted string");
416 <include_quoted>{DQANY}* { LEXOUT(("ISTR(%s) ", ub_c_text)); yymore(); }
417 <include_quoted>{NEWLINE} { ub_c_error("newline before \" in include name");
418 cfg_parser->line++; BEGIN(inc_prev); }
421 ub_c_text[ub_c_leng - 1] = '\0';
422 config_start_include_glob(ub_c_text);
425 <INITIAL,val><<EOF>> {
427 yy_set_bol(1); /* Set beginning of line, so "^" rules match. */
428 if (!config_include_stack) {
432 config_end_include();
436 <val>{UNQUOTEDLETTER}* { LEXOUT(("unquotedstr(%s) ", ub_c_text));
437 if(--num_args == 0) { BEGIN(INITIAL); }
438 ub_c_lval.str = strdup(ub_c_text); return STRING_ARG; }
440 {UNQUOTEDLETTER_NOCOLON}* {
441 ub_c_error_msg("unknown keyword '%s'", ub_c_text);
445 ub_c_error_msg("stray '%s'", ub_c_text);