%{ /* * configlexer.lex - lexical analyzer for unbound config file * * Copyright (c) 2001-2006, NLnet Labs. All rights reserved * * See LICENSE for the license. * */ #include "config.h" #include #include #include #ifdef HAVE_GLOB_H # include #endif #include "util/config_file.h" #include "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", ub_c_text) /** 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) ", ub_c_text, 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)); if(cfg_parser->chroot && strncmp(filename, cfg_parser->chroot, strlen(cfg_parser->chroot)) == 0) { filename += strlen(cfg_parser->chroot); } 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( ub_c_in, 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 %% {SPACE}* { LEXOUT(("SP ")); /* ignore */ } {SPACE}*{COMMENT}.* { /* note that flex makes the longest match and '.' is any but not nl */ LEXOUT(("comment(%s) ", ub_c_text)); /* ignore */ } server{COLON} { YDVAR(0, VAR_SERVER) } qname-minimisation{COLON} { YDVAR(1, VAR_QNAME_MINIMISATION) } 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-max-negative-ttl{COLON} { YDVAR(1, VAR_CACHE_MAX_NEGATIVE_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) } caps-whitelist{COLON} { YDVAR(1, VAR_CAPS_WHITELIST) } 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) } permit-small-holddown{COLON} { YDVAR(1, VAR_PERMIT_SMALL_HOLDDOWN) } 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) } ratelimit{COLON} { YDVAR(1, VAR_RATELIMIT) } ratelimit-slabs{COLON} { YDVAR(1, VAR_RATELIMIT_SLABS) } ratelimit-size{COLON} { YDVAR(1, VAR_RATELIMIT_SIZE) } ratelimit-for-domain{COLON} { YDVAR(2, VAR_RATELIMIT_FOR_DOMAIN) } ratelimit-below-domain{COLON} { YDVAR(2, VAR_RATELIMIT_BELOW_DOMAIN) } ratelimit-factor{COLON} { YDVAR(1, VAR_RATELIMIT_FACTOR) } {NEWLINE} { LEXOUT(("NL\n")); cfg_parser->line++; } /* Quoted strings. Strip leading and ending quotes */ \" { BEGIN(quotedstring); LEXOUT(("QS ")); } <> { ub_c_error("EOF inside quoted string"); if(--num_args == 0) { BEGIN(INITIAL); } else { BEGIN(val); } } {DQANY}* { LEXOUT(("STR(%s) ", ub_c_text)); yymore(); } {NEWLINE} { ub_c_error("newline inside quoted string, no end \""); cfg_parser->line++; BEGIN(INITIAL); } \" { LEXOUT(("QE ")); if(--num_args == 0) { BEGIN(INITIAL); } else { BEGIN(val); } ub_c_text[ub_c_leng - 1] = '\0'; ub_c_lval.str = strdup(ub_c_text); if(!ub_c_lval.str) ub_c_error("out of memory"); return STRING_ARG; } /* Single Quoted strings. Strip leading and ending quotes */ \' { BEGIN(singlequotedstr); LEXOUT(("SQS ")); } <> { ub_c_error("EOF inside quoted string"); if(--num_args == 0) { BEGIN(INITIAL); } else { BEGIN(val); } } {SQANY}* { LEXOUT(("STR(%s) ", ub_c_text)); yymore(); } {NEWLINE} { ub_c_error("newline inside quoted string, no end '"); cfg_parser->line++; BEGIN(INITIAL); } \' { LEXOUT(("SQE ")); if(--num_args == 0) { BEGIN(INITIAL); } else { BEGIN(val); } ub_c_text[ub_c_leng - 1] = '\0'; ub_c_lval.str = strdup(ub_c_text); if(!ub_c_lval.str) ub_c_error("out of memory"); return STRING_ARG; } /* include: directive */ include{COLON} { LEXOUT(("v(%s) ", ub_c_text)); inc_prev = YYSTATE; BEGIN(include); } <> { ub_c_error("EOF inside include directive"); BEGIN(inc_prev); } {SPACE}* { LEXOUT(("ISP ")); /* ignore */ } {NEWLINE} { LEXOUT(("NL\n")); cfg_parser->line++;} \" { LEXOUT(("IQS ")); BEGIN(include_quoted); } {UNQUOTEDLETTER}* { LEXOUT(("Iunquotedstr(%s) ", ub_c_text)); config_start_include_glob(ub_c_text); BEGIN(inc_prev); } <> { ub_c_error("EOF inside quoted string"); BEGIN(inc_prev); } {DQANY}* { LEXOUT(("ISTR(%s) ", ub_c_text)); yymore(); } {NEWLINE} { ub_c_error("newline before \" in include name"); cfg_parser->line++; BEGIN(inc_prev); } \" { LEXOUT(("IQE ")); ub_c_text[ub_c_leng - 1] = '\0'; config_start_include_glob(ub_c_text); BEGIN(inc_prev); } <> { LEXOUT(("LEXEOF ")); yy_set_bol(1); /* Set beginning of line, so "^" rules match. */ if (!config_include_stack) { yyterminate(); } else { fclose(ub_c_in); config_end_include(); } } {UNQUOTEDLETTER}* { LEXOUT(("unquotedstr(%s) ", ub_c_text)); if(--num_args == 0) { BEGIN(INITIAL); } ub_c_lval.str = strdup(ub_c_text); return STRING_ARG; } {UNQUOTEDLETTER_NOCOLON}* { ub_c_error_msg("unknown keyword '%s'", ub_c_text); } <*>. { ub_c_error_msg("stray '%s'", ub_c_text); } %%