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-rw-r--r--bin/dig/dighost.c4604
1 files changed, 4604 insertions, 0 deletions
diff --git a/bin/dig/dighost.c b/bin/dig/dighost.c
new file mode 100644
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--- /dev/null
+++ b/bin/dig/dighost.c
@@ -0,0 +1,4604 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file
+ * \note
+ * Notice to programmers: Do not use this code as an example of how to
+ * use the ISC library to perform DNS lookups. Dig and Host both operate
+ * on the request level, since they allow fine-tuning of output and are
+ * intended as debugging tools. As a result, they perform many of the
+ * functions which could be better handled using the dns_resolver
+ * functions in most applications.
+ */
+
+#include <errno.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifdef HAVE_LOCALE_H
+#include <locale.h>
+#endif /* ifdef HAVE_LOCALE_H */
+
+#ifdef HAVE_LIBIDN2
+#include <idn2.h>
+#endif /* HAVE_LIBIDN2 */
+
+#include <isc/app.h>
+#include <isc/base64.h>
+#include <isc/file.h>
+#include <isc/hex.h>
+#include <isc/lang.h>
+#include <isc/log.h>
+#include <isc/managers.h>
+#include <isc/netaddr.h>
+#include <isc/netdb.h>
+#include <isc/nonce.h>
+#include <isc/parseint.h>
+#include <isc/print.h>
+#include <isc/random.h>
+#include <isc/result.h>
+#include <isc/safe.h>
+#include <isc/serial.h>
+#include <isc/sockaddr.h>
+#include <isc/string.h>
+#include <isc/task.h>
+#include <isc/timer.h>
+#include <isc/types.h>
+#include <isc/util.h>
+
+#include <pk11/site.h>
+
+#include <dns/byaddr.h>
+#include <dns/fixedname.h>
+#include <dns/log.h>
+#include <dns/message.h>
+#include <dns/name.h>
+#include <dns/opcode.h>
+#include <dns/rcode.h>
+#include <dns/rdata.h>
+#include <dns/rdataclass.h>
+#include <dns/rdatalist.h>
+#include <dns/rdataset.h>
+#include <dns/rdatastruct.h>
+#include <dns/rdatatype.h>
+#include <dns/result.h>
+#include <dns/tsig.h>
+
+#include <dst/dst.h>
+#include <dst/result.h>
+
+#include <isccfg/namedconf.h>
+
+#include <irs/resconf.h>
+
+#include <bind9/getaddresses.h>
+
+#include <dig/dig.h>
+
+#if USE_PKCS11
+#include <pk11/result.h>
+#endif /* if USE_PKCS11 */
+
+#if !defined(NS_INADDRSZ)
+#define NS_INADDRSZ 4
+#endif /* if !defined(NS_INADDRSZ) */
+
+#if !defined(NS_IN6ADDRSZ)
+#define NS_IN6ADDRSZ 16
+#endif /* if !defined(NS_IN6ADDRSZ) */
+
+#if HAVE_SETLOCALE
+#define systemlocale(l) (void)setlocale(l, "")
+#define resetlocale(l) (void)setlocale(l, "C")
+#else
+#define systemlocale(l)
+#define resetlocale(l)
+#endif /* HAVE_SETLOCALE */
+
+dig_lookuplist_t lookup_list;
+dig_serverlist_t server_list;
+dig_searchlistlist_t search_list;
+
+bool check_ra = false, have_ipv4 = false, have_ipv6 = false,
+ specified_source = false, free_now = false, cancel_now = false,
+ usesearch = false, showsearch = false, is_dst_up = false,
+ keep_open = false, verbose = false, yaml = false;
+in_port_t port = 53;
+unsigned int timeout = 0;
+unsigned int extrabytes;
+isc_mem_t *mctx = NULL;
+isc_log_t *lctx = NULL;
+isc_nm_t *netmgr = NULL;
+isc_taskmgr_t *taskmgr = NULL;
+isc_task_t *global_task = NULL;
+isc_timermgr_t *timermgr = NULL;
+isc_socketmgr_t *socketmgr = NULL;
+isc_sockaddr_t bind_address;
+isc_sockaddr_t bind_any;
+int sendcount = 0;
+int recvcount = 0;
+int sockcount = 0;
+int ndots = -1;
+int tries = 3;
+int lookup_counter = 0;
+
+static char servercookie[256];
+
+#ifdef HAVE_LIBIDN2
+static void
+idn_locale_to_ace(const char *src, char *dst, size_t dstlen);
+static void
+idn_ace_to_locale(const char *src, char **dst);
+static isc_result_t
+idn_output_filter(isc_buffer_t *buffer, unsigned int used_org);
+#endif /* HAVE_LIBIDN2 */
+
+isc_socket_t *keep = NULL;
+isc_sockaddr_t keepaddr;
+
+/*%
+ * Exit Codes:
+ *
+ *\li 0 Everything went well, including things like NXDOMAIN
+ *\li 1 Usage error
+ *\li 7 Got too many RR's or Names
+ *\li 8 Couldn't open batch file
+ *\li 9 No reply from server
+ *\li 10 Internal error
+ */
+int exitcode = 0;
+int fatalexit = 0;
+char keynametext[MXNAME];
+char keyfile[MXNAME] = "";
+char keysecret[MXNAME] = "";
+unsigned char cookie_secret[33];
+unsigned char cookie[8];
+const dns_name_t *hmacname = NULL;
+unsigned int digestbits = 0;
+isc_buffer_t *namebuf = NULL;
+dns_tsigkey_t *tsigkey = NULL;
+bool validated = true;
+bool debugging = false;
+bool debugtiming = false;
+bool memdebugging = false;
+char *progname = NULL;
+isc_mutex_t lookup_lock;
+dig_lookup_t *current_lookup = NULL;
+
+#define DIG_MAX_ADDRESSES 20
+
+/*%
+ * Apply and clear locks at the event level in global task.
+ * Can I get rid of these using shutdown events? XXX
+ */
+#define LOCK_LOOKUP \
+ { \
+ debug("lock_lookup %s:%d", __FILE__, __LINE__); \
+ check_result(isc_mutex_lock((&lookup_lock)), "isc_mutex_" \
+ "lock"); \
+ debug("success"); \
+ }
+#define UNLOCK_LOOKUP \
+ { \
+ debug("unlock_lookup %s:%d", __FILE__, __LINE__); \
+ check_result(isc_mutex_unlock((&lookup_lock)), "isc_mutex_" \
+ "unlock"); \
+ }
+
+static void
+default_warnerr(const char *format, ...) {
+ va_list args;
+
+ printf(";; ");
+ va_start(args, format);
+ vprintf(format, args);
+ va_end(args);
+ printf("\n");
+}
+
+static void
+default_comments(dig_lookup_t *lookup, const char *format, ...) {
+ va_list args;
+
+ if (lookup->comments) {
+ printf(";; ");
+ va_start(args, format);
+ vprintf(format, args);
+ va_end(args);
+ printf("\n");
+ }
+}
+
+/* dynamic callbacks */
+
+isc_result_t (*dighost_printmessage)(dig_query_t *query,
+ const isc_buffer_t *msgbuf,
+ dns_message_t *msg, bool headers);
+
+void (*dighost_error)(const char *format, ...) = default_warnerr;
+
+void (*dighost_warning)(const char *format, ...) = default_warnerr;
+
+void (*dighost_comments)(dig_lookup_t *lookup, const char *format,
+ ...) = default_comments;
+
+void (*dighost_received)(unsigned int bytes, isc_sockaddr_t *from,
+ dig_query_t *query);
+
+void (*dighost_trying)(char *frm, dig_lookup_t *lookup);
+
+void (*dighost_shutdown)(void);
+
+/* forward declarations */
+
+static void
+cancel_lookup(dig_lookup_t *lookup);
+
+static void
+recv_done(isc_task_t *task, isc_event_t *event);
+
+static void
+send_udp(dig_query_t *query);
+
+static void
+connect_timeout(isc_task_t *task, isc_event_t *event);
+
+static void
+launch_next_query(dig_query_t *query, bool include_question);
+
+static void
+check_next_lookup(dig_lookup_t *lookup);
+
+static bool
+next_origin(dig_lookup_t *oldlookup);
+
+static int
+count_dots(char *string) {
+ char *s;
+ int i = 0;
+
+ s = string;
+ while (*s != '\0') {
+ if (*s == '.') {
+ i++;
+ }
+ s++;
+ }
+ return (i);
+}
+
+static void
+hex_dump(isc_buffer_t *b) {
+ unsigned int len, i;
+ isc_region_t r;
+
+ isc_buffer_usedregion(b, &r);
+
+ printf("%u bytes\n", r.length);
+ for (len = 0; len < r.length; len++) {
+ printf("%02x ", r.base[len]);
+ if (len % 16 == 15) {
+ fputs(" ", stdout);
+ for (i = len - 15; i <= len; i++) {
+ if (r.base[i] >= '!' && r.base[i] <= '}') {
+ putchar(r.base[i]);
+ } else {
+ putchar('.');
+ }
+ }
+ printf("\n");
+ }
+ }
+ if (len % 16 != 0) {
+ for (i = len; (i % 16) != 0; i++) {
+ fputs(" ", stdout);
+ }
+ fputs(" ", stdout);
+ for (i = ((len >> 4) << 4); i < len; i++) {
+ if (r.base[i] >= '!' && r.base[i] <= '}') {
+ putchar(r.base[i]);
+ } else {
+ putchar('.');
+ }
+ }
+ printf("\n");
+ }
+}
+
+/*%
+ * Append 'len' bytes of 'text' at '*p', failing with
+ * ISC_R_NOSPACE if that would advance p past 'end'.
+ */
+static isc_result_t
+append(const char *text, size_t len, char **p, char *end) {
+ if (*p + len > end) {
+ return (ISC_R_NOSPACE);
+ }
+ memmove(*p, text, len);
+ *p += len;
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+reverse_octets(const char *in, char **p, char *end) {
+ const char *dot = strchr(in, '.');
+ size_t len;
+ if (dot != NULL) {
+ isc_result_t result;
+ result = reverse_octets(dot + 1, p, end);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ result = append(".", 1, p, end);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ len = (int)(dot - in);
+ } else {
+ len = (int)strlen(in);
+ }
+ return (append(in, len, p, end));
+}
+
+isc_result_t
+get_reverse(char *reverse, size_t len, char *value, bool strict) {
+ int r;
+ isc_result_t result;
+ isc_netaddr_t addr;
+
+ addr.family = AF_INET6;
+ r = inet_pton(AF_INET6, value, &addr.type.in6);
+ if (r > 0) {
+ /* This is a valid IPv6 address. */
+ dns_fixedname_t fname;
+ dns_name_t *name;
+ unsigned int options = 0;
+
+ name = dns_fixedname_initname(&fname);
+ result = dns_byaddr_createptrname(&addr, options, name);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ dns_name_format(name, reverse, (unsigned int)len);
+ return (ISC_R_SUCCESS);
+ } else {
+ /*
+ * Not a valid IPv6 address. Assume IPv4.
+ * If 'strict' is not set, construct the
+ * in-addr.arpa name by blindly reversing
+ * octets whether or not they look like integers,
+ * so that this can be used for RFC2317 names
+ * and such.
+ */
+ char *p = reverse;
+ char *end = reverse + len;
+ if (strict && inet_pton(AF_INET, value, &addr.type.in) != 1) {
+ return (DNS_R_BADDOTTEDQUAD);
+ }
+ result = reverse_octets(value, &p, end);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ /* Append .in-addr.arpa. and a terminating NUL. */
+ result = append(".in-addr.arpa.", 15, &p, end);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ return (ISC_R_SUCCESS);
+ }
+}
+
+void (*dighost_pre_exit_hook)(void) = NULL;
+
+#if TARGET_OS_IPHONE
+void
+warn(const char *format, ...) {
+ va_list args;
+
+ fflush(stdout);
+ fprintf(stderr, ";; Warning: ");
+ va_start(args, format);
+ vfprintf(stderr, format, args);
+ va_end(args);
+ fprintf(stderr, "\n");
+}
+#else /* if TARGET_OS_IPHONE */
+void
+warn(const char *format, ...) {
+ va_list args;
+
+ fflush(stdout);
+ fprintf(stderr, "%s: ", progname);
+ va_start(args, format);
+ vfprintf(stderr, format, args);
+ va_end(args);
+ fprintf(stderr, "\n");
+}
+#endif /* if TARGET_OS_IPHONE */
+
+void
+digexit(void) {
+ if (exitcode < 10) {
+ exitcode = 10;
+ }
+ if (fatalexit != 0) {
+ exitcode = fatalexit;
+ }
+ if (dighost_pre_exit_hook != NULL) {
+ dighost_pre_exit_hook();
+ }
+ exit(exitcode);
+}
+
+void
+fatal(const char *format, ...) {
+ va_list args;
+
+ fflush(stdout);
+ fprintf(stderr, "%s: ", progname);
+ va_start(args, format);
+ vfprintf(stderr, format, args);
+ va_end(args);
+ fprintf(stderr, "\n");
+ digexit();
+}
+
+void
+debug(const char *format, ...) {
+ va_list args;
+ isc_time_t t;
+
+ if (debugging) {
+ fflush(stdout);
+ if (debugtiming) {
+ TIME_NOW(&t);
+ fprintf(stderr, "%u.%06u: ", isc_time_seconds(&t),
+ isc_time_nanoseconds(&t) / 1000);
+ }
+ va_start(args, format);
+ vfprintf(stderr, format, args);
+ va_end(args);
+ fprintf(stderr, "\n");
+ }
+}
+
+void
+check_result(isc_result_t result, const char *msg) {
+ if (result != ISC_R_SUCCESS) {
+ fatal("%s: %s", msg, isc_result_totext(result));
+ }
+}
+
+/*%
+ * Create a server structure, which is part of the lookup structure.
+ * This is little more than a linked list of servers to query in hopes
+ * of finding the answer the user is looking for
+ */
+dig_server_t *
+make_server(const char *servname, const char *userarg) {
+ dig_server_t *srv;
+
+ REQUIRE(servname != NULL);
+
+ debug("make_server(%s)", servname);
+ srv = isc_mem_allocate(mctx, sizeof(struct dig_server));
+ strlcpy(srv->servername, servname, MXNAME);
+ strlcpy(srv->userarg, userarg, MXNAME);
+ ISC_LINK_INIT(srv, link);
+ return (srv);
+}
+
+/*%
+ * Create a copy of the server list from the resolver configuration structure.
+ * The dest list must have already had ISC_LIST_INIT applied.
+ */
+static void
+get_server_list(irs_resconf_t *resconf) {
+ isc_sockaddrlist_t *servers;
+ isc_sockaddr_t *sa;
+ dig_server_t *newsrv;
+ char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") +
+ sizeof("%4000000000")];
+ debug("get_server_list()");
+ servers = irs_resconf_getnameservers(resconf);
+ for (sa = ISC_LIST_HEAD(*servers); sa != NULL;
+ sa = ISC_LIST_NEXT(sa, link))
+ {
+ int pf = isc_sockaddr_pf(sa);
+ isc_netaddr_t na;
+ isc_result_t result;
+ isc_buffer_t b;
+
+ if (pf == AF_INET && !have_ipv4) {
+ continue;
+ }
+ if (pf == AF_INET6 && !have_ipv6) {
+ continue;
+ }
+
+ isc_buffer_init(&b, tmp, sizeof(tmp));
+ isc_netaddr_fromsockaddr(&na, sa);
+ result = isc_netaddr_totext(&na, &b);
+ if (result != ISC_R_SUCCESS) {
+ continue;
+ }
+ isc_buffer_putuint8(&b, 0);
+ if (pf == AF_INET6 && na.zone != 0) {
+ char buf[sizeof("%4000000000")];
+ snprintf(buf, sizeof(buf), "%%%u", na.zone);
+ strlcat(tmp, buf, sizeof(tmp));
+ }
+ newsrv = make_server(tmp, tmp);
+ ISC_LINK_INIT(newsrv, link);
+ ISC_LIST_APPEND(server_list, newsrv, link);
+ }
+}
+
+void
+flush_server_list(void) {
+ dig_server_t *s, *ps;
+
+ debug("flush_server_list()");
+ s = ISC_LIST_HEAD(server_list);
+ while (s != NULL) {
+ ps = s;
+ s = ISC_LIST_NEXT(s, link);
+ ISC_LIST_DEQUEUE(server_list, ps, link);
+ isc_mem_free(mctx, ps);
+ }
+}
+
+void
+set_nameserver(char *opt) {
+ isc_result_t result;
+ isc_sockaddr_t sockaddrs[DIG_MAX_ADDRESSES];
+ isc_netaddr_t netaddr;
+ int count, i;
+ dig_server_t *srv;
+ char tmp[ISC_NETADDR_FORMATSIZE];
+
+ if (opt == NULL) {
+ return;
+ }
+
+ result = bind9_getaddresses(opt, 0, sockaddrs, DIG_MAX_ADDRESSES,
+ &count);
+ if (result != ISC_R_SUCCESS) {
+ fatal("couldn't get address for '%s': %s", opt,
+ isc_result_totext(result));
+ }
+
+ flush_server_list();
+
+ for (i = 0; i < count; i++) {
+ isc_netaddr_fromsockaddr(&netaddr, &sockaddrs[i]);
+ isc_netaddr_format(&netaddr, tmp, sizeof(tmp));
+ srv = make_server(tmp, opt);
+ if (srv == NULL) {
+ fatal("memory allocation failure");
+ }
+ ISC_LIST_APPEND(server_list, srv, link);
+ }
+}
+
+/*%
+ * Produce a cloned server list. The dest list must have already had
+ * ISC_LIST_INIT applied.
+ */
+void
+clone_server_list(dig_serverlist_t src, dig_serverlist_t *dest) {
+ dig_server_t *srv, *newsrv;
+
+ debug("clone_server_list()");
+ srv = ISC_LIST_HEAD(src);
+ while (srv != NULL) {
+ newsrv = make_server(srv->servername, srv->userarg);
+ ISC_LINK_INIT(newsrv, link);
+ ISC_LIST_ENQUEUE(*dest, newsrv, link);
+ srv = ISC_LIST_NEXT(srv, link);
+ }
+}
+
+/*%
+ * Create an empty lookup structure, which holds all the information needed
+ * to get an answer to a user's question. This structure contains two
+ * linked lists: the server list (servers to query) and the query list
+ * (outstanding queries which have been made to the listed servers).
+ */
+dig_lookup_t *
+make_empty_lookup(void) {
+ dig_lookup_t *looknew;
+
+ debug("make_empty_lookup()");
+
+ INSIST(!free_now);
+
+ looknew = isc_mem_allocate(mctx, sizeof(struct dig_lookup));
+ looknew->pending = true;
+ looknew->textname[0] = 0;
+ looknew->cmdline[0] = 0;
+ looknew->rdtype = dns_rdatatype_a;
+ looknew->qrdtype = dns_rdatatype_a;
+ looknew->rdclass = dns_rdataclass_in;
+ looknew->rdtypeset = false;
+ looknew->rdclassset = false;
+ looknew->sendspace = NULL;
+ looknew->sendmsg = NULL;
+ looknew->name = NULL;
+ looknew->oname = NULL;
+ looknew->xfr_q = NULL;
+ looknew->current_query = NULL;
+ looknew->doing_xfr = false;
+ looknew->ixfr_serial = 0;
+ looknew->trace = false;
+ looknew->trace_root = false;
+ looknew->identify = false;
+ looknew->identify_previous_line = false;
+ looknew->ignore = false;
+ looknew->servfail_stops = true;
+ looknew->besteffort = true;
+ looknew->dnssec = false;
+ looknew->ednsflags = 0;
+ looknew->opcode = dns_opcode_query;
+ looknew->expire = false;
+ looknew->nsid = false;
+ looknew->tcp_keepalive = false;
+ looknew->padding = 0;
+ looknew->header_only = false;
+ looknew->sendcookie = false;
+ looknew->seenbadcookie = false;
+ looknew->badcookie = true;
+ looknew->multiline = false;
+ looknew->nottl = false;
+ looknew->noclass = false;
+ looknew->onesoa = false;
+ looknew->use_usec = false;
+ looknew->nocrypto = false;
+ looknew->ttlunits = false;
+ looknew->expandaaaa = false;
+ looknew->qr = false;
+ looknew->accept_reply_unexpected_src = false;
+#ifdef HAVE_LIBIDN2
+ looknew->idnin = isatty(1) ? (getenv("IDN_DISABLE") == NULL) : false;
+ looknew->idnout = looknew->idnin;
+#else /* ifdef HAVE_LIBIDN2 */
+ looknew->idnin = false;
+ looknew->idnout = false;
+#endif /* HAVE_LIBIDN2 */
+ looknew->udpsize = -1;
+ looknew->edns = -1;
+ looknew->recurse = true;
+ looknew->aaonly = false;
+ looknew->adflag = false;
+ looknew->cdflag = false;
+ looknew->raflag = false;
+ looknew->tcflag = false;
+ looknew->print_unknown_format = false;
+ looknew->zflag = false;
+ looknew->ns_search_only = false;
+ looknew->origin = NULL;
+ looknew->tsigctx = NULL;
+ looknew->querysig = NULL;
+ looknew->retries = tries;
+ looknew->nsfound = 0;
+ looknew->tcp_mode = false;
+ looknew->tcp_mode_set = false;
+ looknew->comments = true;
+ looknew->stats = true;
+ looknew->section_question = true;
+ looknew->section_answer = true;
+ looknew->section_authority = true;
+ looknew->section_additional = true;
+ looknew->new_search = false;
+ looknew->done_as_is = false;
+ looknew->need_search = false;
+ looknew->ecs_addr = NULL;
+ looknew->cookie = NULL;
+ looknew->ednsopts = NULL;
+ looknew->ednsoptscnt = 0;
+ looknew->ednsneg = true;
+ looknew->mapped = true;
+ looknew->dscp = -1;
+ looknew->rrcomments = 0;
+ looknew->eoferr = 0;
+ dns_fixedname_init(&looknew->fdomain);
+ ISC_LINK_INIT(looknew, link);
+ ISC_LIST_INIT(looknew->q);
+ ISC_LIST_INIT(looknew->connecting);
+ ISC_LIST_INIT(looknew->my_server_list);
+ return (looknew);
+}
+
+#define EDNSOPT_OPTIONS 100U
+
+static void
+cloneopts(dig_lookup_t *looknew, dig_lookup_t *lookold) {
+ size_t len = sizeof(looknew->ednsopts[0]) * EDNSOPT_OPTIONS;
+ size_t i;
+ looknew->ednsopts = isc_mem_allocate(mctx, len);
+ for (i = 0; i < EDNSOPT_OPTIONS; i++) {
+ looknew->ednsopts[i].code = 0;
+ looknew->ednsopts[i].length = 0;
+ looknew->ednsopts[i].value = NULL;
+ }
+ looknew->ednsoptscnt = 0;
+ if (lookold == NULL || lookold->ednsopts == NULL) {
+ return;
+ }
+
+ for (i = 0; i < lookold->ednsoptscnt; i++) {
+ len = lookold->ednsopts[i].length;
+ if (len != 0) {
+ INSIST(lookold->ednsopts[i].value != NULL);
+ looknew->ednsopts[i].value = isc_mem_allocate(mctx,
+ len);
+ memmove(looknew->ednsopts[i].value,
+ lookold->ednsopts[i].value, len);
+ }
+ looknew->ednsopts[i].code = lookold->ednsopts[i].code;
+ looknew->ednsopts[i].length = len;
+ }
+ looknew->ednsoptscnt = lookold->ednsoptscnt;
+}
+
+/*%
+ * Clone a lookup, perhaps copying the server list. This does not clone
+ * the query list, since it will be regenerated by the setup_lookup()
+ * function, nor does it queue up the new lookup for processing.
+ * Caution: If you don't clone the servers, you MUST clone the server
+ * list separately from somewhere else, or construct it by hand.
+ */
+dig_lookup_t *
+clone_lookup(dig_lookup_t *lookold, bool servers) {
+ dig_lookup_t *looknew;
+
+ debug("clone_lookup(%p)", lookold);
+
+ INSIST(!free_now);
+
+ looknew = make_empty_lookup();
+ INSIST(looknew != NULL);
+ strlcpy(looknew->textname, lookold->textname, MXNAME);
+ strlcpy(looknew->cmdline, lookold->cmdline, MXNAME);
+ looknew->textname[MXNAME - 1] = 0;
+ looknew->rdtype = lookold->rdtype;
+ looknew->qrdtype = lookold->qrdtype;
+ looknew->rdclass = lookold->rdclass;
+ looknew->rdtypeset = lookold->rdtypeset;
+ looknew->rdclassset = lookold->rdclassset;
+ looknew->doing_xfr = lookold->doing_xfr;
+ looknew->ixfr_serial = lookold->ixfr_serial;
+ looknew->trace = lookold->trace;
+ looknew->trace_root = lookold->trace_root;
+ looknew->identify = lookold->identify;
+ looknew->identify_previous_line = lookold->identify_previous_line;
+ looknew->ignore = lookold->ignore;
+ looknew->servfail_stops = lookold->servfail_stops;
+ looknew->besteffort = lookold->besteffort;
+ looknew->dnssec = lookold->dnssec;
+ looknew->ednsflags = lookold->ednsflags;
+ looknew->opcode = lookold->opcode;
+ looknew->expire = lookold->expire;
+ looknew->nsid = lookold->nsid;
+ looknew->tcp_keepalive = lookold->tcp_keepalive;
+ looknew->header_only = lookold->header_only;
+ looknew->sendcookie = lookold->sendcookie;
+ looknew->seenbadcookie = lookold->seenbadcookie;
+ looknew->badcookie = lookold->badcookie;
+ looknew->cookie = lookold->cookie;
+ if (lookold->ednsopts != NULL) {
+ cloneopts(looknew, lookold);
+ } else {
+ looknew->ednsopts = NULL;
+ looknew->ednsoptscnt = 0;
+ }
+ looknew->ednsneg = lookold->ednsneg;
+ looknew->padding = lookold->padding;
+ looknew->mapped = lookold->mapped;
+ looknew->multiline = lookold->multiline;
+ looknew->nottl = lookold->nottl;
+ looknew->noclass = lookold->noclass;
+ looknew->onesoa = lookold->onesoa;
+ looknew->use_usec = lookold->use_usec;
+ looknew->nocrypto = lookold->nocrypto;
+ looknew->ttlunits = lookold->ttlunits;
+ looknew->expandaaaa = lookold->expandaaaa;
+ looknew->qr = lookold->qr;
+ looknew->accept_reply_unexpected_src =
+ lookold->accept_reply_unexpected_src;
+ looknew->idnin = lookold->idnin;
+ looknew->idnout = lookold->idnout;
+ looknew->udpsize = lookold->udpsize;
+ looknew->edns = lookold->edns;
+ looknew->recurse = lookold->recurse;
+ looknew->aaonly = lookold->aaonly;
+ looknew->adflag = lookold->adflag;
+ looknew->cdflag = lookold->cdflag;
+ looknew->raflag = lookold->raflag;
+ looknew->tcflag = lookold->tcflag;
+ looknew->print_unknown_format = lookold->print_unknown_format;
+ looknew->zflag = lookold->zflag;
+ looknew->ns_search_only = lookold->ns_search_only;
+ looknew->tcp_mode = lookold->tcp_mode;
+ looknew->tcp_mode_set = lookold->tcp_mode_set;
+ looknew->comments = lookold->comments;
+ looknew->stats = lookold->stats;
+ looknew->section_question = lookold->section_question;
+ looknew->section_answer = lookold->section_answer;
+ looknew->section_authority = lookold->section_authority;
+ looknew->section_additional = lookold->section_additional;
+ looknew->origin = lookold->origin;
+ looknew->retries = lookold->retries;
+ looknew->tsigctx = NULL;
+ looknew->need_search = lookold->need_search;
+ looknew->done_as_is = lookold->done_as_is;
+ looknew->dscp = lookold->dscp;
+ looknew->rrcomments = lookold->rrcomments;
+ looknew->eoferr = lookold->eoferr;
+
+ if (lookold->ecs_addr != NULL) {
+ size_t len = sizeof(isc_sockaddr_t);
+ looknew->ecs_addr = isc_mem_allocate(mctx, len);
+ memmove(looknew->ecs_addr, lookold->ecs_addr, len);
+ }
+
+ dns_name_copynf(dns_fixedname_name(&lookold->fdomain),
+ dns_fixedname_name(&looknew->fdomain));
+
+ if (servers) {
+ clone_server_list(lookold->my_server_list,
+ &looknew->my_server_list);
+ }
+ return (looknew);
+}
+
+/*%
+ * Requeue a lookup for further processing, perhaps copying the server
+ * list. The new lookup structure is returned to the caller, and is
+ * queued for processing. If servers are not cloned in the requeue, they
+ * must be added before allowing the current event to complete, since the
+ * completion of the event may result in the next entry on the lookup
+ * queue getting run.
+ */
+dig_lookup_t *
+requeue_lookup(dig_lookup_t *lookold, bool servers) {
+ dig_lookup_t *looknew;
+
+ debug("requeue_lookup(%p)", lookold);
+
+ lookup_counter++;
+ if (lookup_counter > LOOKUP_LIMIT) {
+ fatal("too many lookups");
+ }
+
+ looknew = clone_lookup(lookold, servers);
+ INSIST(looknew != NULL);
+
+ debug("before insertion, init@%p -> %p, new@%p -> %p", lookold,
+ lookold->link.next, looknew, looknew->link.next);
+ ISC_LIST_PREPEND(lookup_list, looknew, link);
+ debug("after insertion, init -> %p, new = %p, new -> %p", lookold,
+ looknew, looknew->link.next);
+ return (looknew);
+}
+
+void
+setup_text_key(void) {
+ isc_result_t result;
+ dns_name_t keyname;
+ isc_buffer_t secretbuf;
+ unsigned int secretsize;
+ unsigned char *secretstore;
+
+ debug("setup_text_key()");
+ isc_buffer_allocate(mctx, &namebuf, MXNAME);
+ dns_name_init(&keyname, NULL);
+ isc_buffer_putstr(namebuf, keynametext);
+ secretsize = (unsigned int)strlen(keysecret) * 3 / 4;
+ secretstore = isc_mem_allocate(mctx, secretsize);
+ isc_buffer_init(&secretbuf, secretstore, secretsize);
+ result = isc_base64_decodestring(keysecret, &secretbuf);
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ secretsize = isc_buffer_usedlength(&secretbuf);
+
+ if (hmacname == NULL) {
+ result = DST_R_UNSUPPORTEDALG;
+ goto failure;
+ }
+
+ result = dns_name_fromtext(&keyname, namebuf, dns_rootname, 0, namebuf);
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ result = dns_tsigkey_create(&keyname, hmacname, secretstore,
+ (int)secretsize, false, NULL, 0, 0, mctx,
+ NULL, &tsigkey);
+failure:
+ if (result != ISC_R_SUCCESS) {
+ printf(";; Couldn't create key %s: %s\n", keynametext,
+ isc_result_totext(result));
+ } else {
+ dst_key_setbits(tsigkey->key, digestbits);
+ }
+
+ isc_mem_free(mctx, secretstore);
+ dns_name_invalidate(&keyname);
+ isc_buffer_free(&namebuf);
+}
+
+static isc_result_t
+parse_uint_helper(uint32_t *uip, const char *value, uint32_t max,
+ const char *desc, int base) {
+ uint32_t n;
+ isc_result_t result = isc_parse_uint32(&n, value, base);
+ if (result == ISC_R_SUCCESS && n > max) {
+ result = ISC_R_RANGE;
+ }
+ if (result != ISC_R_SUCCESS) {
+ printf("invalid %s '%s': %s\n", desc, value,
+ isc_result_totext(result));
+ return (result);
+ }
+ *uip = n;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+parse_uint(uint32_t *uip, const char *value, uint32_t max, const char *desc) {
+ return (parse_uint_helper(uip, value, max, desc, 10));
+}
+
+isc_result_t
+parse_xint(uint32_t *uip, const char *value, uint32_t max, const char *desc) {
+ return (parse_uint_helper(uip, value, max, desc, 0));
+}
+
+static uint32_t
+parse_bits(char *arg, const char *desc, uint32_t max) {
+ isc_result_t result;
+ uint32_t tmp;
+
+ result = parse_uint(&tmp, arg, max, desc);
+ if (result != ISC_R_SUCCESS) {
+ fatal("couldn't parse digest bits");
+ }
+ tmp = (tmp + 7) & ~0x7U;
+ return (tmp);
+}
+
+isc_result_t
+parse_netprefix(isc_sockaddr_t **sap, const char *value) {
+ isc_result_t result = ISC_R_SUCCESS;
+ isc_sockaddr_t *sa = NULL;
+ struct in_addr in4;
+ struct in6_addr in6;
+ uint32_t prefix_length = 0xffffffff;
+ char *slash = NULL;
+ bool parsed = false;
+ bool prefix_parsed = false;
+ char buf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:XXX.XXX.XXX.XXX/128")];
+
+ REQUIRE(sap != NULL && *sap == NULL);
+
+ if (strlcpy(buf, value, sizeof(buf)) >= sizeof(buf)) {
+ fatal("invalid prefix '%s'\n", value);
+ }
+
+ sa = isc_mem_allocate(mctx, sizeof(*sa));
+ memset(sa, 0, sizeof(*sa));
+
+ if (strcmp(buf, "0") == 0) {
+ sa->type.sa.sa_family = AF_UNSPEC;
+ prefix_length = 0;
+ goto done;
+ }
+
+ slash = strchr(buf, '/');
+ if (slash != NULL) {
+ *slash = '\0';
+ result = isc_parse_uint32(&prefix_length, slash + 1, 10);
+ if (result != ISC_R_SUCCESS) {
+ fatal("invalid prefix length in '%s': %s\n", value,
+ isc_result_totext(result));
+ }
+ prefix_parsed = true;
+ }
+
+ if (inet_pton(AF_INET6, buf, &in6) == 1) {
+ parsed = true;
+ isc_sockaddr_fromin6(sa, &in6, 0);
+ if (prefix_length > 128) {
+ prefix_length = 128;
+ }
+ } else if (inet_pton(AF_INET, buf, &in4) == 1) {
+ parsed = true;
+ isc_sockaddr_fromin(sa, &in4, 0);
+ if (prefix_length > 32) {
+ prefix_length = 32;
+ }
+ } else if (prefix_parsed) {
+ int i;
+
+ for (i = 0; i < 3 && strlen(buf) < sizeof(buf) - 2; i++) {
+ strlcat(buf, ".0", sizeof(buf));
+ if (inet_pton(AF_INET, buf, &in4) == 1) {
+ parsed = true;
+ isc_sockaddr_fromin(sa, &in4, 0);
+ break;
+ }
+ }
+
+ if (prefix_length > 32) {
+ prefix_length = 32;
+ }
+ }
+
+ if (!parsed) {
+ fatal("invalid address '%s'", value);
+ }
+
+done:
+ sa->length = prefix_length;
+ *sap = sa;
+
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * Parse HMAC algorithm specification
+ */
+void
+parse_hmac(const char *hmac) {
+ char buf[20];
+ size_t len;
+
+ REQUIRE(hmac != NULL);
+
+ len = strlen(hmac);
+ if (len >= sizeof(buf)) {
+ fatal("unknown key type '%.*s'", (int)len, hmac);
+ }
+ strlcpy(buf, hmac, sizeof(buf));
+
+ digestbits = 0;
+
+ if (strcasecmp(buf, "hmac-md5") == 0) {
+ hmacname = DNS_TSIG_HMACMD5_NAME;
+ } else if (strncasecmp(buf, "hmac-md5-", 9) == 0) {
+ hmacname = DNS_TSIG_HMACMD5_NAME;
+ digestbits = parse_bits(&buf[9], "digest-bits [0..128]", 128);
+ } else if (strcasecmp(buf, "hmac-sha1") == 0) {
+ hmacname = DNS_TSIG_HMACSHA1_NAME;
+ digestbits = 0;
+ } else if (strncasecmp(buf, "hmac-sha1-", 10) == 0) {
+ hmacname = DNS_TSIG_HMACSHA1_NAME;
+ digestbits = parse_bits(&buf[10], "digest-bits [0..160]", 160);
+ } else if (strcasecmp(buf, "hmac-sha224") == 0) {
+ hmacname = DNS_TSIG_HMACSHA224_NAME;
+ } else if (strncasecmp(buf, "hmac-sha224-", 12) == 0) {
+ hmacname = DNS_TSIG_HMACSHA224_NAME;
+ digestbits = parse_bits(&buf[12], "digest-bits [0..224]", 224);
+ } else if (strcasecmp(buf, "hmac-sha256") == 0) {
+ hmacname = DNS_TSIG_HMACSHA256_NAME;
+ } else if (strncasecmp(buf, "hmac-sha256-", 12) == 0) {
+ hmacname = DNS_TSIG_HMACSHA256_NAME;
+ digestbits = parse_bits(&buf[12], "digest-bits [0..256]", 256);
+ } else if (strcasecmp(buf, "hmac-sha384") == 0) {
+ hmacname = DNS_TSIG_HMACSHA384_NAME;
+ } else if (strncasecmp(buf, "hmac-sha384-", 12) == 0) {
+ hmacname = DNS_TSIG_HMACSHA384_NAME;
+ digestbits = parse_bits(&buf[12], "digest-bits [0..384]", 384);
+ } else if (strcasecmp(buf, "hmac-sha512") == 0) {
+ hmacname = DNS_TSIG_HMACSHA512_NAME;
+ } else if (strncasecmp(buf, "hmac-sha512-", 12) == 0) {
+ hmacname = DNS_TSIG_HMACSHA512_NAME;
+ digestbits = parse_bits(&buf[12], "digest-bits [0..512]", 512);
+ } else {
+ fprintf(stderr,
+ ";; Warning, ignoring "
+ "invalid TSIG algorithm %s\n",
+ buf);
+ }
+}
+
+/*
+ * Get a key from a named.conf format keyfile
+ */
+static isc_result_t
+read_confkey(void) {
+ cfg_parser_t *pctx = NULL;
+ cfg_obj_t *file = NULL;
+ const cfg_obj_t *keyobj = NULL;
+ const cfg_obj_t *secretobj = NULL;
+ const cfg_obj_t *algorithmobj = NULL;
+ const char *keyname;
+ const char *secretstr;
+ const char *algorithm;
+ isc_result_t result;
+
+ if (!isc_file_exists(keyfile)) {
+ return (ISC_R_FILENOTFOUND);
+ }
+
+ result = cfg_parser_create(mctx, NULL, &pctx);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ result = cfg_parse_file(pctx, keyfile, &cfg_type_sessionkey, &file);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ result = cfg_map_get(file, "key", &keyobj);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ (void)cfg_map_get(keyobj, "secret", &secretobj);
+ (void)cfg_map_get(keyobj, "algorithm", &algorithmobj);
+ if (secretobj == NULL || algorithmobj == NULL) {
+ fatal("key must have algorithm and secret");
+ }
+
+ keyname = cfg_obj_asstring(cfg_map_getname(keyobj));
+ secretstr = cfg_obj_asstring(secretobj);
+ algorithm = cfg_obj_asstring(algorithmobj);
+
+ strlcpy(keynametext, keyname, sizeof(keynametext));
+ strlcpy(keysecret, secretstr, sizeof(keysecret));
+ parse_hmac(algorithm);
+ setup_text_key();
+
+cleanup:
+ if (pctx != NULL) {
+ if (file != NULL) {
+ cfg_obj_destroy(pctx, &file);
+ }
+ cfg_parser_destroy(&pctx);
+ }
+
+ return (result);
+}
+
+void
+setup_file_key(void) {
+ isc_result_t result;
+ dst_key_t *dstkey = NULL;
+
+ debug("setup_file_key()");
+
+ /* Try reading the key from a K* pair */
+ result = dst_key_fromnamedfile(
+ keyfile, NULL, DST_TYPE_PRIVATE | DST_TYPE_KEY, mctx, &dstkey);
+
+ /* If that didn't work, try reading it as a session.key keyfile */
+ if (result != ISC_R_SUCCESS) {
+ result = read_confkey();
+ if (result == ISC_R_SUCCESS) {
+ return;
+ }
+ }
+
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "Couldn't read key from %s: %s\n", keyfile,
+ isc_result_totext(result));
+ goto failure;
+ }
+
+ switch (dst_key_alg(dstkey)) {
+ case DST_ALG_HMACMD5:
+ hmacname = DNS_TSIG_HMACMD5_NAME;
+ break;
+ case DST_ALG_HMACSHA1:
+ hmacname = DNS_TSIG_HMACSHA1_NAME;
+ break;
+ case DST_ALG_HMACSHA224:
+ hmacname = DNS_TSIG_HMACSHA224_NAME;
+ break;
+ case DST_ALG_HMACSHA256:
+ hmacname = DNS_TSIG_HMACSHA256_NAME;
+ break;
+ case DST_ALG_HMACSHA384:
+ hmacname = DNS_TSIG_HMACSHA384_NAME;
+ break;
+ case DST_ALG_HMACSHA512:
+ hmacname = DNS_TSIG_HMACSHA512_NAME;
+ break;
+ default:
+ printf(";; Couldn't create key %s: bad algorithm\n",
+ keynametext);
+ goto failure;
+ }
+ result = dns_tsigkey_createfromkey(dst_key_name(dstkey), hmacname,
+ dstkey, false, NULL, 0, 0, mctx,
+ NULL, &tsigkey);
+ if (result != ISC_R_SUCCESS) {
+ printf(";; Couldn't create key %s: %s\n", keynametext,
+ isc_result_totext(result));
+ goto failure;
+ }
+failure:
+ if (dstkey != NULL) {
+ dst_key_free(&dstkey);
+ }
+}
+
+static dig_searchlist_t *
+make_searchlist_entry(char *domain) {
+ dig_searchlist_t *search;
+ search = isc_mem_allocate(mctx, sizeof(*search));
+ strlcpy(search->origin, domain, MXNAME);
+ search->origin[MXNAME - 1] = 0;
+ ISC_LINK_INIT(search, link);
+ return (search);
+}
+
+static void
+clear_searchlist(void) {
+ dig_searchlist_t *search;
+ while ((search = ISC_LIST_HEAD(search_list)) != NULL) {
+ ISC_LIST_UNLINK(search_list, search, link);
+ isc_mem_free(mctx, search);
+ }
+}
+
+static void
+create_search_list(irs_resconf_t *resconf) {
+ irs_resconf_searchlist_t *list;
+ irs_resconf_search_t *entry;
+ dig_searchlist_t *search;
+
+ debug("create_search_list()");
+ clear_searchlist();
+
+ list = irs_resconf_getsearchlist(resconf);
+ for (entry = ISC_LIST_HEAD(*list); entry != NULL;
+ entry = ISC_LIST_NEXT(entry, link))
+ {
+ search = make_searchlist_entry(entry->domain);
+ ISC_LIST_APPEND(search_list, search, link);
+ }
+}
+
+/*%
+ * Append 'addr' to the list of servers to be queried. This function is only
+ * called when no server addresses are explicitly specified and either libirs
+ * returns an empty list of servers to use or none of the addresses returned by
+ * libirs are usable due to the specified address family restrictions.
+ */
+static void
+add_fallback_nameserver(const char *addr) {
+ dig_server_t *server = make_server(addr, addr);
+ ISC_LINK_INIT(server, link);
+ ISC_LIST_APPEND(server_list, server, link);
+}
+
+/*%
+ * Setup the system as a whole, reading key information and resolv.conf
+ * settings.
+ */
+void
+setup_system(bool ipv4only, bool ipv6only) {
+ irs_resconf_t *resconf = NULL;
+ isc_result_t result;
+
+ debug("setup_system()");
+
+ if (ipv4only) {
+ if (have_ipv4) {
+ isc_net_disableipv6();
+ have_ipv6 = false;
+ } else {
+ fatal("can't find IPv4 networking");
+ }
+ }
+
+ if (ipv6only) {
+ if (have_ipv6) {
+ isc_net_disableipv4();
+ have_ipv4 = false;
+ } else {
+ fatal("can't find IPv6 networking");
+ }
+ }
+
+ result = irs_resconf_load(mctx, RESOLV_CONF, &resconf);
+ if (result != ISC_R_SUCCESS && result != ISC_R_FILENOTFOUND) {
+ fatal("parse of %s failed", RESOLV_CONF);
+ }
+
+ create_search_list(resconf);
+ if (ndots == -1) {
+ ndots = irs_resconf_getndots(resconf);
+ debug("ndots is %d.", ndots);
+ }
+
+ /* If user doesn't specify server use nameservers from resolv.conf. */
+ if (ISC_LIST_EMPTY(server_list)) {
+ get_server_list(resconf);
+ }
+
+ /* If we don't find a nameserver fall back to localhost */
+ if (ISC_LIST_EMPTY(server_list)) {
+ if (have_ipv6) {
+ add_fallback_nameserver("::1");
+ }
+ if (have_ipv4) {
+ add_fallback_nameserver("127.0.0.1");
+ }
+ }
+
+ irs_resconf_destroy(&resconf);
+
+ if (keyfile[0] != 0) {
+ setup_file_key();
+ } else if (keysecret[0] != 0) {
+ setup_text_key();
+ }
+
+ isc_nonce_buf(cookie_secret, sizeof(cookie_secret));
+}
+
+/*%
+ * Override the search list derived from resolv.conf by 'domain'.
+ */
+void
+set_search_domain(char *domain) {
+ dig_searchlist_t *search;
+
+ clear_searchlist();
+ search = make_searchlist_entry(domain);
+ ISC_LIST_APPEND(search_list, search, link);
+}
+
+/*%
+ * Setup the ISC and DNS libraries for use by the system.
+ */
+void
+setup_libs(void) {
+ isc_result_t result;
+ isc_logconfig_t *logconfig = NULL;
+
+ debug("setup_libs()");
+
+#if USE_PKCS11
+ pk11_result_register();
+#endif /* if USE_PKCS11 */
+ dns_result_register();
+
+ result = isc_net_probeipv4();
+ if (result == ISC_R_SUCCESS) {
+ have_ipv4 = true;
+ }
+
+ result = isc_net_probeipv6();
+ if (result == ISC_R_SUCCESS) {
+ have_ipv6 = true;
+ }
+ if (!have_ipv6 && !have_ipv4) {
+ fatal("can't find either v4 or v6 networking");
+ }
+
+ isc_mem_create(&mctx);
+ isc_mem_setname(mctx, "dig", NULL);
+
+ isc_log_create(mctx, &lctx, &logconfig);
+ isc_log_setcontext(lctx);
+ dns_log_init(lctx);
+ dns_log_setcontext(lctx);
+
+ result = isc_log_usechannel(logconfig, "default_debug", NULL, NULL);
+ check_result(result, "isc_log_usechannel");
+
+ isc_log_setdebuglevel(lctx, 0);
+
+ result = isc_managers_create(mctx, 1, 0, &netmgr, &taskmgr);
+ check_result(result, "isc_managers_create");
+
+ result = isc_task_create(taskmgr, 0, &global_task);
+ check_result(result, "isc_task_create");
+ isc_task_setname(global_task, "dig", NULL);
+
+ result = isc_timermgr_create(mctx, &timermgr);
+ check_result(result, "isc_timermgr_create");
+
+ result = isc_socketmgr_create(mctx, &socketmgr);
+ check_result(result, "isc_socketmgr_create");
+
+ result = dst_lib_init(mctx, NULL);
+ check_result(result, "dst_lib_init");
+ is_dst_up = true;
+
+ isc_mutex_init(&lookup_lock);
+}
+
+typedef struct dig_ednsoptname {
+ uint32_t code;
+ const char *name;
+} dig_ednsoptname_t;
+
+dig_ednsoptname_t optnames[] = {
+ { 1, "LLQ" }, /* draft-sekar-dns-llq */
+ { 3, "NSID" }, /* RFC 5001 */
+ { 5, "DAU" }, /* RFC 6975 */
+ { 6, "DHU" }, /* RFC 6975 */
+ { 7, "N3U" }, /* RFC 6975 */
+ { 8, "ECS" }, /* RFC 7871 */
+ { 9, "EXPIRE" }, /* RFC 7314 */
+ { 10, "COOKIE" }, /* RFC 7873 */
+ { 11, "KEEPALIVE" }, /* RFC 7828 */
+ { 12, "PADDING" }, /* RFC 7830 */
+ { 12, "PAD" }, /* shorthand */
+ { 13, "CHAIN" }, /* RFC 7901 */
+ { 14, "KEY-TAG" }, /* RFC 8145 */
+ { 15, "EDE" }, /* ietf-dnsop-extended-error-16 */
+ { 16, "CLIENT-TAG" }, /* draft-bellis-dnsop-edns-tags */
+ { 17, "SERVER-TAG" }, /* draft-bellis-dnsop-edns-tags */
+ { 26946, "DEVICEID" }, /* Brian Hartvigsen */
+};
+
+#define N_EDNS_OPTNAMES (sizeof(optnames) / sizeof(optnames[0]))
+
+void
+save_opt(dig_lookup_t *lookup, char *code, char *value) {
+ isc_result_t result;
+ uint32_t num = 0;
+ isc_buffer_t b;
+ bool found = false;
+ unsigned int i;
+
+ if (lookup->ednsoptscnt >= EDNSOPT_OPTIONS) {
+ fatal("too many ednsopts");
+ }
+
+ for (i = 0; i < N_EDNS_OPTNAMES; i++) {
+ if (strcasecmp(code, optnames[i].name) == 0) {
+ num = optnames[i].code;
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ result = parse_uint(&num, code, 65535, "ednsopt");
+ if (result != ISC_R_SUCCESS) {
+ fatal("bad edns code point: %s", code);
+ }
+ }
+
+ if (lookup->ednsopts == NULL) {
+ cloneopts(lookup, NULL);
+ }
+
+ if (lookup->ednsopts[lookup->ednsoptscnt].value != NULL) {
+ isc_mem_free(mctx, lookup->ednsopts[lookup->ednsoptscnt].value);
+ }
+
+ lookup->ednsopts[lookup->ednsoptscnt].code = num;
+ lookup->ednsopts[lookup->ednsoptscnt].length = 0;
+ lookup->ednsopts[lookup->ednsoptscnt].value = NULL;
+
+ if (value != NULL) {
+ char *buf;
+ buf = isc_mem_allocate(mctx, strlen(value) / 2 + 1);
+ isc_buffer_init(&b, buf, (unsigned int)strlen(value) / 2 + 1);
+ result = isc_hex_decodestring(value, &b);
+ check_result(result, "isc_hex_decodestring");
+ lookup->ednsopts[lookup->ednsoptscnt].value =
+ isc_buffer_base(&b);
+ lookup->ednsopts[lookup->ednsoptscnt].length =
+ isc_buffer_usedlength(&b);
+ }
+
+ lookup->ednsoptscnt++;
+}
+
+/*%
+ * Add EDNS0 option record to a message. Currently, the only supported
+ * options are UDP buffer size, the DO bit, and EDNS options
+ * (e.g., NSID, COOKIE, client-subnet)
+ */
+static void
+add_opt(dns_message_t *msg, uint16_t udpsize, uint16_t edns, unsigned int flags,
+ dns_ednsopt_t *opts, size_t count) {
+ dns_rdataset_t *rdataset = NULL;
+ isc_result_t result;
+
+ debug("add_opt()");
+ result = dns_message_buildopt(msg, &rdataset, edns, udpsize, flags,
+ opts, count);
+ check_result(result, "dns_message_buildopt");
+ result = dns_message_setopt(msg, rdataset);
+ check_result(result, "dns_message_setopt");
+}
+
+/*%
+ * Add a question section to a message, asking for the specified name,
+ * type, and class.
+ */
+static void
+add_question(dns_message_t *message, dns_name_t *name, dns_rdataclass_t rdclass,
+ dns_rdatatype_t rdtype) {
+ dns_rdataset_t *rdataset;
+ isc_result_t result;
+
+ debug("add_question()");
+ rdataset = NULL;
+ result = dns_message_gettemprdataset(message, &rdataset);
+ check_result(result, "dns_message_gettemprdataset()");
+ dns_rdataset_makequestion(rdataset, rdclass, rdtype);
+ ISC_LIST_APPEND(name->list, rdataset, link);
+}
+
+/*%
+ * Check if we're done with all the queued lookups, which is true iff
+ * all sockets, sends, and recvs are accounted for (counters == 0),
+ * and the lookup list is empty.
+ * If we are done, pass control back out to dighost_shutdown() (which is
+ * part of dig.c, host.c, or nslookup.c) to either shutdown the system as
+ * a whole or reseed the lookup list.
+ */
+static void
+check_if_done(void) {
+ debug("check_if_done()");
+ debug("list %s", ISC_LIST_EMPTY(lookup_list) ? "empty" : "full");
+ if (ISC_LIST_EMPTY(lookup_list) && current_lookup == NULL &&
+ sendcount == 0)
+ {
+ INSIST(sockcount == 0);
+ INSIST(recvcount == 0);
+ debug("shutting down");
+ dighost_shutdown();
+ }
+}
+
+/*%
+ * Clear out a query when we're done with it. WARNING: This routine
+ * WILL invalidate the query pointer.
+ */
+static void
+clear_query(dig_query_t *query) {
+ dig_lookup_t *lookup;
+
+ REQUIRE(query != NULL);
+
+ debug("clear_query(%p)", query);
+
+ if (query->timer != NULL) {
+ isc_timer_destroy(&query->timer);
+ }
+ lookup = query->lookup;
+
+ if (lookup->current_query == query) {
+ lookup->current_query = NULL;
+ }
+
+ if (ISC_LINK_LINKED(query, link)) {
+ query->saved_next = ISC_LIST_NEXT(query, link);
+ ISC_LIST_UNLINK(lookup->q, query, link);
+ }
+ if (ISC_LINK_LINKED(query, clink)) {
+ ISC_LIST_UNLINK(lookup->connecting, query, clink);
+ }
+ INSIST(query->recvspace != NULL);
+
+ if (query->sock != NULL) {
+ isc_socket_detach(&query->sock);
+ sockcount--;
+ debug("sockcount=%d", sockcount);
+ }
+ isc_mem_put(mctx, query->recvspace, COMMSIZE);
+ isc_mem_put(mctx, query->tmpsendspace, COMMSIZE);
+ isc_buffer_invalidate(&query->recvbuf);
+ isc_buffer_invalidate(&query->lengthbuf);
+
+ if (query->waiting_senddone) {
+ debug("waiting senddone, delay freeing query");
+ query->pending_free = true;
+ } else {
+ query->magic = 0;
+ isc_mem_free(mctx, query);
+ }
+}
+
+/*%
+ * Try and clear out a lookup if we're done with it. Return true if
+ * the lookup was successfully cleared. If true is returned, the
+ * lookup pointer has been invalidated.
+ */
+static bool
+try_clear_lookup(dig_lookup_t *lookup) {
+ dig_query_t *q;
+
+ REQUIRE(lookup != NULL);
+
+ debug("try_clear_lookup(%p)", lookup);
+
+ if (ISC_LIST_HEAD(lookup->q) != NULL ||
+ ISC_LIST_HEAD(lookup->connecting) != NULL)
+ {
+ if (debugging) {
+ q = ISC_LIST_HEAD(lookup->q);
+ while (q != NULL) {
+ debug("query to %s still pending", q->servname);
+ q = ISC_LIST_NEXT(q, link);
+ }
+
+ q = ISC_LIST_HEAD(lookup->connecting);
+ while (q != NULL) {
+ debug("query to %s still connecting",
+ q->servname);
+ q = ISC_LIST_NEXT(q, clink);
+ }
+ }
+ return (false);
+ }
+
+ /*
+ * At this point, we know there are no queries on the lookup,
+ * so can make it go away also.
+ */
+ destroy_lookup(lookup);
+ return (true);
+}
+
+void
+destroy_lookup(dig_lookup_t *lookup) {
+ dig_server_t *s;
+ void *ptr;
+
+ debug("destroy");
+ s = ISC_LIST_HEAD(lookup->my_server_list);
+ while (s != NULL) {
+ debug("freeing server %p belonging to %p", s, lookup);
+ ptr = s;
+ s = ISC_LIST_NEXT(s, link);
+ ISC_LIST_DEQUEUE(lookup->my_server_list, (dig_server_t *)ptr,
+ link);
+ isc_mem_free(mctx, ptr);
+ }
+ if (lookup->sendmsg != NULL) {
+ dns_message_detach(&lookup->sendmsg);
+ }
+ if (lookup->querysig != NULL) {
+ debug("freeing buffer %p", lookup->querysig);
+ isc_buffer_free(&lookup->querysig);
+ }
+ if (lookup->sendspace != NULL) {
+ isc_mem_put(mctx, lookup->sendspace, COMMSIZE);
+ }
+
+ if (lookup->tsigctx != NULL) {
+ dst_context_destroy(&lookup->tsigctx);
+ }
+
+ if (lookup->ecs_addr != NULL) {
+ isc_mem_free(mctx, lookup->ecs_addr);
+ }
+
+ if (lookup->ednsopts != NULL) {
+ size_t i;
+ for (i = 0; i < EDNSOPT_OPTIONS; i++) {
+ if (lookup->ednsopts[i].value != NULL) {
+ isc_mem_free(mctx, lookup->ednsopts[i].value);
+ }
+ }
+ isc_mem_free(mctx, lookup->ednsopts);
+ }
+
+ isc_mem_free(mctx, lookup);
+}
+
+/*%
+ * If we can, start the next lookup in the queue running.
+ * This assumes that the lookup on the head of the queue hasn't been
+ * started yet. It also removes the lookup from the head of the queue,
+ * setting the current_lookup pointer pointing to it.
+ */
+void
+start_lookup(void) {
+ debug("start_lookup()");
+ if (cancel_now) {
+ return;
+ }
+
+ /*
+ * If there's a current lookup running, we really shouldn't get
+ * here.
+ */
+ INSIST(current_lookup == NULL);
+
+ current_lookup = ISC_LIST_HEAD(lookup_list);
+ /*
+ * Put the current lookup somewhere so cancel_all can find it
+ */
+ if (current_lookup != NULL) {
+ ISC_LIST_DEQUEUE(lookup_list, current_lookup, link);
+ if (setup_lookup(current_lookup)) {
+ do_lookup(current_lookup);
+ } else if (next_origin(current_lookup)) {
+ check_next_lookup(current_lookup);
+ }
+ } else {
+ check_if_done();
+ }
+}
+
+/*%
+ * If we can, clear the current lookup and start the next one running.
+ * This calls try_clear_lookup, so may invalidate the lookup pointer.
+ */
+static void
+check_next_lookup(dig_lookup_t *lookup) {
+ INSIST(!free_now);
+
+ debug("check_next_lookup(%p)", lookup);
+
+ if (ISC_LIST_HEAD(lookup->q) != NULL) {
+ debug("still have a worker");
+ return;
+ }
+ if (try_clear_lookup(lookup)) {
+ current_lookup = NULL;
+ start_lookup();
+ }
+}
+
+/*%
+ * Create and queue a new lookup as a followup to the current lookup,
+ * based on the supplied message and section. This is used in trace and
+ * name server search modes to start a new lookup using servers from
+ * NS records in a reply. Returns the number of followup lookups made.
+ */
+static int
+followup_lookup(dns_message_t *msg, dig_query_t *query, dns_section_t section) {
+ dig_lookup_t *lookup = NULL;
+ dig_server_t *srv = NULL;
+ dns_rdataset_t *rdataset = NULL;
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ dns_name_t *name = NULL;
+ isc_result_t result;
+ bool success = false;
+ int numLookups = 0;
+ int num;
+ isc_result_t lresult, addresses_result;
+ char bad_namestr[DNS_NAME_FORMATSIZE];
+ dns_name_t *domain;
+ bool horizontal = false, bad = false;
+
+ INSIST(!free_now);
+
+ debug("following up %s", query->lookup->textname);
+
+ addresses_result = ISC_R_SUCCESS;
+ bad_namestr[0] = '\0';
+ for (result = dns_message_firstname(msg, section);
+ result == ISC_R_SUCCESS;
+ result = dns_message_nextname(msg, section))
+ {
+ name = NULL;
+ dns_message_currentname(msg, section, &name);
+
+ if (section == DNS_SECTION_AUTHORITY) {
+ rdataset = NULL;
+ result = dns_message_findtype(name, dns_rdatatype_soa,
+ 0, &rdataset);
+ if (result == ISC_R_SUCCESS) {
+ return (0);
+ }
+ }
+ rdataset = NULL;
+ result = dns_message_findtype(name, dns_rdatatype_ns, 0,
+ &rdataset);
+ if (result != ISC_R_SUCCESS) {
+ continue;
+ }
+
+ debug("found NS set");
+
+ if (query->lookup->trace && !query->lookup->trace_root) {
+ dns_namereln_t namereln;
+ unsigned int nlabels;
+ int order;
+
+ domain = dns_fixedname_name(&query->lookup->fdomain);
+ namereln = dns_name_fullcompare(name, domain, &order,
+ &nlabels);
+ if (namereln == dns_namereln_equal) {
+ if (!horizontal) {
+ dighost_warning("BAD (HORIZONTAL) "
+ "REFERRAL");
+ }
+ horizontal = true;
+ } else if (namereln != dns_namereln_subdomain) {
+ if (!bad) {
+ dighost_warning("BAD REFERRAL");
+ }
+ bad = true;
+ continue;
+ }
+ }
+
+ for (result = dns_rdataset_first(rdataset);
+ result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(rdataset))
+ {
+ char namestr[DNS_NAME_FORMATSIZE];
+ dns_rdata_ns_t ns;
+
+ if (query->lookup->trace_root &&
+ query->lookup->nsfound >= MXSERV)
+ {
+ break;
+ }
+
+ dns_rdataset_current(rdataset, &rdata);
+
+ query->lookup->nsfound++;
+ result = dns_rdata_tostruct(&rdata, &ns, NULL);
+ check_result(result, "dns_rdata_tostruct");
+ dns_name_format(&ns.name, namestr, sizeof(namestr));
+ dns_rdata_freestruct(&ns);
+
+ /* Initialize lookup if we've not yet */
+ debug("found NS %s", namestr);
+ if (!success) {
+ success = true;
+ lookup_counter++;
+ lookup = requeue_lookup(query->lookup, false);
+ cancel_lookup(query->lookup);
+ lookup->doing_xfr = false;
+ if (!lookup->trace_root &&
+ section == DNS_SECTION_ANSWER)
+ {
+ lookup->trace = false;
+ } else {
+ lookup->trace = query->lookup->trace;
+ }
+ lookup->ns_search_only =
+ query->lookup->ns_search_only;
+ lookup->trace_root = false;
+ if (lookup->ns_search_only) {
+ lookup->recurse = false;
+ }
+ domain = dns_fixedname_name(&lookup->fdomain);
+ dns_name_copynf(name, domain);
+ }
+ debug("adding server %s", namestr);
+ num = getaddresses(lookup, namestr, &lresult);
+ if (lresult != ISC_R_SUCCESS) {
+ printf("couldn't get address for '%s': %s\n",
+ namestr, isc_result_totext(lresult));
+ if (addresses_result == ISC_R_SUCCESS) {
+ addresses_result = lresult;
+ strlcpy(bad_namestr, namestr,
+ sizeof(bad_namestr));
+ }
+ }
+ numLookups += num;
+ dns_rdata_reset(&rdata);
+ }
+ }
+ if (numLookups == 0 && addresses_result != ISC_R_SUCCESS) {
+ fatal("couldn't get address for '%s': %s", bad_namestr,
+ isc_result_totext(result));
+ }
+
+ if (lookup == NULL && section == DNS_SECTION_ANSWER &&
+ (query->lookup->trace || query->lookup->ns_search_only))
+ {
+ return (followup_lookup(msg, query, DNS_SECTION_AUTHORITY));
+ }
+
+ /*
+ * Randomize the order the nameserver will be tried.
+ */
+ if (numLookups > 1) {
+ uint32_t i, j;
+ dig_serverlist_t my_server_list;
+ dig_server_t *next;
+
+ ISC_LIST_INIT(my_server_list);
+
+ i = numLookups;
+ for (srv = ISC_LIST_HEAD(lookup->my_server_list); srv != NULL;
+ srv = ISC_LIST_HEAD(lookup->my_server_list))
+ {
+ INSIST(i > 0);
+ j = isc_random_uniform(i);
+ next = ISC_LIST_NEXT(srv, link);
+ while (j-- > 0 && next != NULL) {
+ srv = next;
+ next = ISC_LIST_NEXT(srv, link);
+ }
+ ISC_LIST_DEQUEUE(lookup->my_server_list, srv, link);
+ ISC_LIST_APPEND(my_server_list, srv, link);
+ i--;
+ }
+ ISC_LIST_APPENDLIST(lookup->my_server_list, my_server_list,
+ link);
+ }
+
+ return (numLookups);
+}
+
+/*%
+ * Create and queue a new lookup using the next origin from the search
+ * list, read in setup_system().
+ *
+ * Return true iff there was another searchlist entry.
+ */
+static bool
+next_origin(dig_lookup_t *oldlookup) {
+ dig_lookup_t *newlookup;
+ dig_searchlist_t *search;
+ dns_fixedname_t fixed;
+ dns_name_t *name;
+ isc_result_t result;
+
+ INSIST(!free_now);
+
+ debug("next_origin(%p)", oldlookup);
+ debug("following up %s", oldlookup->textname);
+
+ if (!usesearch) {
+ /*
+ * We're not using a search list, so don't even think
+ * about finding the next entry.
+ */
+ return (false);
+ }
+
+ /*
+ * Check for a absolute name or ndots being met.
+ */
+ name = dns_fixedname_initname(&fixed);
+ result = dns_name_fromstring2(name, oldlookup->textname, NULL, 0, NULL);
+ if (result == ISC_R_SUCCESS &&
+ (dns_name_isabsolute(name) ||
+ (int)dns_name_countlabels(name) > ndots))
+ {
+ return (false);
+ }
+
+ if (oldlookup->origin == NULL && !oldlookup->need_search) {
+ /*
+ * Then we just did rootorg; there's nothing left.
+ */
+ return (false);
+ }
+ if (oldlookup->origin == NULL && oldlookup->need_search) {
+ newlookup = requeue_lookup(oldlookup, true);
+ newlookup->origin = ISC_LIST_HEAD(search_list);
+ newlookup->need_search = false;
+ } else {
+ search = ISC_LIST_NEXT(oldlookup->origin, link);
+ if (search == NULL && oldlookup->done_as_is) {
+ return (false);
+ }
+ newlookup = requeue_lookup(oldlookup, true);
+ newlookup->origin = search;
+ }
+ cancel_lookup(oldlookup);
+ return (true);
+}
+
+/*%
+ * Insert an SOA record into the sendmessage in a lookup. Used for
+ * creating IXFR queries.
+ */
+static void
+insert_soa(dig_lookup_t *lookup) {
+ isc_result_t result;
+ dns_rdata_soa_t soa;
+ dns_rdata_t *rdata = NULL;
+ dns_rdatalist_t *rdatalist = NULL;
+ dns_rdataset_t *rdataset = NULL;
+ dns_name_t *soaname = NULL;
+
+ debug("insert_soa(%p)", lookup);
+ soa.mctx = mctx;
+ soa.serial = lookup->ixfr_serial;
+ soa.refresh = 0;
+ soa.retry = 0;
+ soa.expire = 0;
+ soa.minimum = 0;
+ soa.common.rdclass = lookup->rdclass;
+ soa.common.rdtype = dns_rdatatype_soa;
+
+ dns_name_init(&soa.origin, NULL);
+ dns_name_init(&soa.contact, NULL);
+
+ dns_name_clone(dns_rootname, &soa.origin);
+ dns_name_clone(dns_rootname, &soa.contact);
+
+ isc_buffer_init(&lookup->rdatabuf, lookup->rdatastore,
+ sizeof(lookup->rdatastore));
+
+ result = dns_message_gettemprdata(lookup->sendmsg, &rdata);
+ check_result(result, "dns_message_gettemprdata");
+
+ result = dns_rdata_fromstruct(rdata, lookup->rdclass, dns_rdatatype_soa,
+ &soa, &lookup->rdatabuf);
+ check_result(result, "isc_rdata_fromstruct");
+
+ result = dns_message_gettemprdatalist(lookup->sendmsg, &rdatalist);
+ check_result(result, "dns_message_gettemprdatalist");
+
+ result = dns_message_gettemprdataset(lookup->sendmsg, &rdataset);
+ check_result(result, "dns_message_gettemprdataset");
+
+ dns_rdatalist_init(rdatalist);
+ rdatalist->type = dns_rdatatype_soa;
+ rdatalist->rdclass = lookup->rdclass;
+ ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
+
+ dns_rdatalist_tordataset(rdatalist, rdataset);
+
+ result = dns_message_gettempname(lookup->sendmsg, &soaname);
+ check_result(result, "dns_message_gettempname");
+ dns_name_clone(lookup->name, soaname);
+ ISC_LIST_INIT(soaname->list);
+ ISC_LIST_APPEND(soaname->list, rdataset, link);
+ dns_message_addname(lookup->sendmsg, soaname, DNS_SECTION_AUTHORITY);
+}
+
+static void
+compute_cookie(unsigned char *clientcookie, size_t len) {
+ /* XXXMPA need to fix, should be per server. */
+ INSIST(len >= 8U);
+ memmove(clientcookie, cookie_secret, 8);
+}
+
+/*%
+ * Setup the supplied lookup structure, making it ready to start sending
+ * queries to servers. Create and initialize the message to be sent as
+ * well as the query structures and buffer space for the replies. If the
+ * server list is empty, clone it from the system default list.
+ */
+bool
+setup_lookup(dig_lookup_t *lookup) {
+ isc_result_t result;
+ unsigned int len;
+ dig_server_t *serv;
+ dig_query_t *query;
+ isc_buffer_t b;
+ dns_compress_t cctx;
+ char store[MXNAME];
+ char ecsbuf[20];
+ char cookiebuf[256];
+ char *origin = NULL;
+ char *textname = NULL;
+
+ REQUIRE(lookup != NULL);
+
+#ifdef HAVE_LIBIDN2
+ char idn_origin[MXNAME], idn_textname[MXNAME];
+
+ result = dns_name_settotextfilter(lookup->idnout ? idn_output_filter
+ : NULL);
+ check_result(result, "dns_name_settotextfilter");
+#endif /* HAVE_LIBIDN2 */
+
+ INSIST(!free_now);
+
+ debug("setup_lookup(%p)", lookup);
+
+ dns_message_create(mctx, DNS_MESSAGE_INTENTRENDER, &lookup->sendmsg);
+
+ if (lookup->new_search) {
+ debug("resetting lookup counter.");
+ lookup_counter = 0;
+ }
+
+ if (ISC_LIST_EMPTY(lookup->my_server_list)) {
+ debug("cloning server list");
+ clone_server_list(server_list, &lookup->my_server_list);
+ }
+ result = dns_message_gettempname(lookup->sendmsg, &lookup->name);
+ check_result(result, "dns_message_gettempname");
+
+ isc_buffer_init(&lookup->namebuf, lookup->name_space,
+ sizeof(lookup->name_space));
+ isc_buffer_init(&lookup->onamebuf, lookup->oname_space,
+ sizeof(lookup->oname_space));
+
+ /*
+ * We cannot convert `textname' and `origin' separately.
+ * `textname' doesn't contain TLD, but local mapping needs
+ * TLD.
+ */
+ textname = lookup->textname;
+#ifdef HAVE_LIBIDN2
+ if (lookup->idnin) {
+ idn_locale_to_ace(textname, idn_textname, sizeof(idn_textname));
+ debug("idn_textname: %s", idn_textname);
+ textname = idn_textname;
+ }
+#endif /* HAVE_LIBIDN2 */
+
+ /*
+ * If the name has too many dots, force the origin to be NULL
+ * (which produces an absolute lookup). Otherwise, take the origin
+ * we have if there's one in the struct already. If it's NULL,
+ * take the first entry in the searchlist iff either usesearch
+ * is TRUE or we got a domain line in the resolv.conf file.
+ */
+ if (lookup->new_search) {
+ if ((count_dots(textname) >= ndots) || !usesearch) {
+ lookup->origin = NULL; /* Force abs lookup */
+ lookup->done_as_is = true;
+ lookup->need_search = usesearch;
+ } else if (lookup->origin == NULL && usesearch) {
+ lookup->origin = ISC_LIST_HEAD(search_list);
+ lookup->need_search = false;
+ }
+ }
+
+ if (lookup->origin != NULL) {
+ debug("trying origin %s", lookup->origin->origin);
+ result = dns_message_gettempname(lookup->sendmsg,
+ &lookup->oname);
+ check_result(result, "dns_message_gettempname");
+ /* XXX Helper funct to conv char* to name? */
+ origin = lookup->origin->origin;
+#ifdef HAVE_LIBIDN2
+ if (lookup->idnin) {
+ idn_locale_to_ace(origin, idn_origin,
+ sizeof(idn_origin));
+ debug("trying idn origin %s", idn_origin);
+ origin = idn_origin;
+ }
+#endif /* HAVE_LIBIDN2 */
+ len = (unsigned int)strlen(origin);
+ isc_buffer_init(&b, origin, len);
+ isc_buffer_add(&b, len);
+ result = dns_name_fromtext(lookup->oname, &b, dns_rootname, 0,
+ &lookup->onamebuf);
+ if (result != ISC_R_SUCCESS) {
+ dns_message_puttempname(lookup->sendmsg, &lookup->name);
+ dns_message_puttempname(lookup->sendmsg,
+ &lookup->oname);
+ fatal("'%s' is not in legal name syntax (%s)", origin,
+ isc_result_totext(result));
+ }
+ if (lookup->trace && lookup->trace_root) {
+ dns_name_clone(dns_rootname, lookup->name);
+ } else {
+ dns_fixedname_t fixed;
+ dns_name_t *name;
+
+ name = dns_fixedname_initname(&fixed);
+ len = (unsigned int)strlen(textname);
+ isc_buffer_init(&b, textname, len);
+ isc_buffer_add(&b, len);
+ result = dns_name_fromtext(name, &b, NULL, 0, NULL);
+ if (result == ISC_R_SUCCESS) {
+ if (!dns_name_isabsolute(name)) {
+ result = dns_name_concatenate(
+ name, lookup->oname,
+ lookup->name, &lookup->namebuf);
+ } else {
+ result = dns_name_copy(
+ name, lookup->name,
+ &lookup->namebuf);
+ }
+ }
+ if (result != ISC_R_SUCCESS) {
+ dns_message_puttempname(lookup->sendmsg,
+ &lookup->name);
+ dns_message_puttempname(lookup->sendmsg,
+ &lookup->oname);
+ if (result == DNS_R_NAMETOOLONG) {
+ return (false);
+ }
+ fatal("'%s' is not in legal name syntax (%s)",
+ lookup->textname,
+ isc_result_totext(result));
+ }
+ }
+ dns_message_puttempname(lookup->sendmsg, &lookup->oname);
+ } else {
+ debug("using root origin");
+ if (lookup->trace && lookup->trace_root) {
+ dns_name_clone(dns_rootname, lookup->name);
+ } else {
+ len = (unsigned int)strlen(textname);
+ isc_buffer_init(&b, textname, len);
+ isc_buffer_add(&b, len);
+ result = dns_name_fromtext(lookup->name, &b,
+ dns_rootname, 0,
+ &lookup->namebuf);
+ }
+ if (result != ISC_R_SUCCESS) {
+ dns_message_puttempname(lookup->sendmsg, &lookup->name);
+ warn("'%s' is not a legal name "
+ "(%s)",
+ lookup->textname, isc_result_totext(result));
+#if TARGET_OS_IPHONE
+ check_next_lookup(current_lookup);
+ return (false);
+#else /* if TARGET_OS_IPHONE */
+ digexit();
+#endif /* if TARGET_OS_IPHONE */
+ }
+ }
+ dns_name_format(lookup->name, store, sizeof(store));
+ dighost_trying(store, lookup);
+ INSIST(dns_name_isabsolute(lookup->name));
+
+ lookup->sendmsg->id = (dns_messageid_t)isc_random16();
+ lookup->sendmsg->opcode = lookup->opcode;
+ lookup->msgcounter = 0;
+
+ /*
+ * If this is a trace request, completely disallow recursion after
+ * looking up the root name servers, since it's meaningless for traces.
+ */
+ if ((lookup->trace || lookup->ns_search_only) && !lookup->trace_root) {
+ lookup->recurse = false;
+ }
+
+ if (lookup->recurse && lookup->rdtype != dns_rdatatype_axfr &&
+ lookup->rdtype != dns_rdatatype_ixfr)
+ {
+ debug("recursive query");
+ lookup->sendmsg->flags |= DNS_MESSAGEFLAG_RD;
+ }
+
+ /* XXX aaflag */
+ if (lookup->aaonly) {
+ debug("AA query");
+ lookup->sendmsg->flags |= DNS_MESSAGEFLAG_AA;
+ }
+
+ if (lookup->adflag) {
+ debug("AD query");
+ lookup->sendmsg->flags |= DNS_MESSAGEFLAG_AD;
+ }
+
+ if (lookup->cdflag) {
+ debug("CD query");
+ lookup->sendmsg->flags |= DNS_MESSAGEFLAG_CD;
+ }
+
+ if (lookup->raflag) {
+ debug("RA query");
+ lookup->sendmsg->flags |= DNS_MESSAGEFLAG_RA;
+ }
+
+ if (lookup->tcflag) {
+ debug("TC query");
+ lookup->sendmsg->flags |= DNS_MESSAGEFLAG_TC;
+ }
+
+ if (lookup->zflag) {
+ debug("Z query");
+ lookup->sendmsg->flags |= 0x0040U;
+ }
+
+ dns_message_addname(lookup->sendmsg, lookup->name,
+ DNS_SECTION_QUESTION);
+
+ if (lookup->trace && lookup->trace_root) {
+ lookup->qrdtype = lookup->rdtype;
+ lookup->rdtype = dns_rdatatype_ns;
+ }
+
+ if ((lookup->rdtype == dns_rdatatype_axfr) ||
+ (lookup->rdtype == dns_rdatatype_ixfr))
+ {
+ /*
+ * Force TCP mode if we're doing an axfr.
+ */
+ if (lookup->rdtype == dns_rdatatype_axfr) {
+ lookup->doing_xfr = true;
+ lookup->tcp_mode = true;
+ } else if (lookup->tcp_mode) {
+ lookup->doing_xfr = true;
+ }
+ }
+
+ if (!lookup->header_only) {
+ add_question(lookup->sendmsg, lookup->name, lookup->rdclass,
+ lookup->rdtype);
+ }
+
+ /* add_soa */
+ if (lookup->rdtype == dns_rdatatype_ixfr) {
+ insert_soa(lookup);
+ }
+
+ /* XXX Insist this? */
+ lookup->tsigctx = NULL;
+ lookup->querysig = NULL;
+ if (tsigkey != NULL) {
+ debug("initializing keys");
+ result = dns_message_settsigkey(lookup->sendmsg, tsigkey);
+ check_result(result, "dns_message_settsigkey");
+ }
+
+ lookup->sendspace = isc_mem_get(mctx, COMMSIZE);
+
+ result = dns_compress_init(&cctx, -1, mctx);
+ check_result(result, "dns_compress_init");
+
+ debug("starting to render the message");
+ isc_buffer_init(&lookup->renderbuf, lookup->sendspace, COMMSIZE);
+ result = dns_message_renderbegin(lookup->sendmsg, &cctx,
+ &lookup->renderbuf);
+ check_result(result, "dns_message_renderbegin");
+ if (lookup->udpsize > 0 || lookup->dnssec || lookup->edns > -1 ||
+ lookup->ecs_addr != NULL)
+ {
+#define MAXOPTS (EDNSOPT_OPTIONS + DNS_EDNSOPTIONS)
+ dns_ednsopt_t opts[MAXOPTS];
+ unsigned int flags;
+ unsigned int i = 0;
+
+ /*
+ * There can't be more than MAXOPTS options to send:
+ * a maximum of EDNSOPT_OPTIONS set by +ednsopt
+ * and DNS_EDNSOPTIONS set by other arguments
+ * (+nsid, +cookie, etc).
+ */
+ if (lookup->udpsize < 0) {
+ lookup->udpsize = DEFAULT_EDNS_BUFSIZE;
+ }
+ if (lookup->edns < 0) {
+ lookup->edns = DEFAULT_EDNS_VERSION;
+ }
+
+ if (lookup->nsid) {
+ INSIST(i < MAXOPTS);
+ opts[i].code = DNS_OPT_NSID;
+ opts[i].length = 0;
+ opts[i].value = NULL;
+ i++;
+ }
+
+ if (lookup->ecs_addr != NULL) {
+ uint8_t addr[16];
+ uint16_t family = 0;
+ uint32_t plen;
+ struct sockaddr *sa;
+ struct sockaddr_in *sin;
+ struct sockaddr_in6 *sin6;
+ size_t addrl;
+
+ sa = &lookup->ecs_addr->type.sa;
+ plen = lookup->ecs_addr->length;
+
+ /* Round up prefix len to a multiple of 8 */
+ addrl = (plen + 7) / 8;
+
+ INSIST(i < MAXOPTS);
+ opts[i].code = DNS_OPT_CLIENT_SUBNET;
+ opts[i].length = (uint16_t)addrl + 4;
+ check_result(result, "isc_buffer_allocate");
+
+ /*
+ * XXXMUKS: According to RFC7871, "If there is
+ * no ADDRESS set, i.e., SOURCE PREFIX-LENGTH is
+ * set to 0, then FAMILY SHOULD be set to the
+ * transport over which the query is sent."
+ *
+ * However, at this point we don't know what
+ * transport(s) we'll be using, so we can't
+ * set the value now. For now, we're using
+ * IPv4 as the default the +subnet option
+ * used an IPv4 prefix, or for +subnet=0,
+ * and IPv6 if the +subnet option used an
+ * IPv6 prefix.
+ *
+ * (For future work: preserve the offset into
+ * the buffer where the family field is;
+ * that way we can update it in send_udp()
+ * or send_tcp_connect() once we know
+ * what it outght to be.)
+ */
+ switch (sa->sa_family) {
+ case AF_UNSPEC:
+ INSIST(plen == 0);
+ family = 1;
+ break;
+ case AF_INET:
+ INSIST(plen <= 32);
+ family = 1;
+ sin = (struct sockaddr_in *)sa;
+ memmove(addr, &sin->sin_addr, addrl);
+ break;
+ case AF_INET6:
+ INSIST(plen <= 128);
+ family = 2;
+ sin6 = (struct sockaddr_in6 *)sa;
+ memmove(addr, &sin6->sin6_addr, addrl);
+ break;
+ default:
+ UNREACHABLE();
+ }
+
+ isc_buffer_init(&b, ecsbuf, sizeof(ecsbuf));
+ /* family */
+ isc_buffer_putuint16(&b, family);
+ /* source prefix-length */
+ isc_buffer_putuint8(&b, plen);
+ /* scope prefix-length */
+ isc_buffer_putuint8(&b, 0);
+
+ /* address */
+ if (addrl > 0) {
+ /* Mask off last address byte */
+ if ((plen % 8) != 0) {
+ addr[addrl - 1] &= ~0U
+ << (8 - (plen % 8));
+ }
+ isc_buffer_putmem(&b, addr, (unsigned)addrl);
+ }
+
+ opts[i].value = (uint8_t *)ecsbuf;
+ i++;
+ }
+
+ if (lookup->sendcookie) {
+ INSIST(i < MAXOPTS);
+ opts[i].code = DNS_OPT_COOKIE;
+ if (lookup->cookie != NULL) {
+ isc_buffer_init(&b, cookiebuf,
+ sizeof(cookiebuf));
+ result = isc_hex_decodestring(lookup->cookie,
+ &b);
+ check_result(result, "isc_hex_decodestring");
+ opts[i].value = isc_buffer_base(&b);
+ opts[i].length = isc_buffer_usedlength(&b);
+ } else {
+ compute_cookie(cookie, sizeof(cookie));
+ opts[i].length = 8;
+ opts[i].value = cookie;
+ }
+ i++;
+ }
+
+ if (lookup->expire) {
+ INSIST(i < MAXOPTS);
+ opts[i].code = DNS_OPT_EXPIRE;
+ opts[i].length = 0;
+ opts[i].value = NULL;
+ i++;
+ }
+
+ if (lookup->tcp_keepalive) {
+ INSIST(i < MAXOPTS);
+ opts[i].code = DNS_OPT_TCP_KEEPALIVE;
+ opts[i].length = 0;
+ opts[i].value = NULL;
+ i++;
+ }
+
+ if (lookup->ednsoptscnt != 0) {
+ INSIST(i + lookup->ednsoptscnt <= MAXOPTS);
+ memmove(&opts[i], lookup->ednsopts,
+ sizeof(dns_ednsopt_t) * lookup->ednsoptscnt);
+ i += lookup->ednsoptscnt;
+ }
+
+ if (lookup->padding != 0 && (i >= MAXOPTS)) {
+ debug("turned off padding because of EDNS overflow");
+ lookup->padding = 0;
+ }
+
+ if (lookup->padding != 0) {
+ INSIST(i < MAXOPTS);
+ opts[i].code = DNS_OPT_PAD;
+ opts[i].length = 0;
+ opts[i].value = NULL;
+ i++;
+ dns_message_setpadding(lookup->sendmsg,
+ lookup->padding);
+ }
+
+ flags = lookup->ednsflags;
+ flags &= ~DNS_MESSAGEEXTFLAG_DO;
+ if (lookup->dnssec) {
+ flags |= DNS_MESSAGEEXTFLAG_DO;
+ }
+ add_opt(lookup->sendmsg, lookup->udpsize, lookup->edns, flags,
+ opts, i);
+ }
+
+ result = dns_message_rendersection(lookup->sendmsg,
+ DNS_SECTION_QUESTION, 0);
+ check_result(result, "dns_message_rendersection");
+ result = dns_message_rendersection(lookup->sendmsg,
+ DNS_SECTION_AUTHORITY, 0);
+ check_result(result, "dns_message_rendersection");
+ result = dns_message_renderend(lookup->sendmsg);
+ check_result(result, "dns_message_renderend");
+ debug("done rendering");
+
+ dns_compress_invalidate(&cctx);
+
+ /*
+ * Force TCP mode if the request is larger than 512 bytes.
+ */
+ if (isc_buffer_usedlength(&lookup->renderbuf) > 512) {
+ lookup->tcp_mode = true;
+ }
+
+ lookup->pending = false;
+
+ for (serv = ISC_LIST_HEAD(lookup->my_server_list); serv != NULL;
+ serv = ISC_LIST_NEXT(serv, link))
+ {
+ query = isc_mem_allocate(mctx, sizeof(dig_query_t));
+ debug("create query %p linked to lookup %p", query, lookup);
+ query->lookup = lookup;
+ query->timer = NULL;
+ query->waiting_connect = false;
+ query->waiting_senddone = false;
+ query->pending_free = false;
+ query->recv_made = false;
+ query->first_pass = true;
+ query->first_soa_rcvd = false;
+ query->second_rr_rcvd = false;
+ query->first_repeat_rcvd = false;
+ query->warn_id = true;
+ query->timedout = false;
+ query->first_rr_serial = 0;
+ query->second_rr_serial = 0;
+ query->servname = serv->servername;
+ query->userarg = serv->userarg;
+ query->rr_count = 0;
+ query->msg_count = 0;
+ query->byte_count = 0;
+ query->ixfr_axfr = false;
+ query->sock = NULL;
+ query->recvspace = isc_mem_get(mctx, COMMSIZE);
+ query->tmpsendspace = isc_mem_get(mctx, COMMSIZE);
+ if (query->recvspace == NULL) {
+ fatal("memory allocation failure");
+ }
+
+ isc_buffer_init(&query->recvbuf, query->recvspace, COMMSIZE);
+ isc_buffer_init(&query->lengthbuf, query->lengthspace, 2);
+ isc_buffer_init(&query->tmpsendbuf, query->tmpsendspace,
+ COMMSIZE);
+ query->sendbuf = lookup->renderbuf;
+
+ isc_time_settoepoch(&query->time_sent);
+ isc_time_settoepoch(&query->time_recv);
+
+ ISC_LINK_INIT(query, clink);
+ ISC_LINK_INIT(query, link);
+ query->saved_next = NULL;
+
+ query->magic = DIG_QUERY_MAGIC;
+
+ ISC_LIST_ENQUEUE(lookup->q, query, link);
+ }
+
+ return (true);
+}
+
+/*%
+ * Event handler for send completion. Track send counter, and clear out
+ * the query if the send was canceled.
+ */
+static void
+send_done(isc_task_t *_task, isc_event_t *event) {
+ dig_query_t *query, *next;
+ dig_lookup_t *l;
+
+ REQUIRE(event->ev_type == ISC_SOCKEVENT_SENDDONE);
+
+ UNUSED(_task);
+
+ LOCK_LOOKUP;
+
+ debug("send_done(%p)", event->ev_arg);
+ sendcount--;
+ debug("sendcount=%d", sendcount);
+ INSIST(sendcount >= 0);
+
+ query = event->ev_arg;
+ REQUIRE(DIG_VALID_QUERY(query));
+ query->waiting_senddone = false;
+ l = query->lookup;
+
+ if (l == current_lookup && l->ns_search_only && !l->trace_root &&
+ !l->tcp_mode)
+ {
+ debug("sending next, since searching");
+ next = query->pending_free ? query->saved_next
+ : ISC_LIST_NEXT(query, link);
+ if (next != NULL) {
+ send_udp(next);
+ }
+ }
+
+ isc_event_free(&event);
+
+ if (query->pending_free) {
+ query->magic = 0;
+ isc_mem_free(mctx, query);
+ }
+
+ check_if_done();
+ UNLOCK_LOOKUP;
+}
+
+/*%
+ * Cancel a lookup, sending isc_socket_cancel() requests to all outstanding
+ * IO sockets. The cancel handlers should take care of cleaning up the
+ * query and lookup structures
+ */
+static void
+cancel_lookup(dig_lookup_t *lookup) {
+ dig_query_t *query, *next;
+
+ debug("cancel_lookup(%p)", lookup);
+ query = ISC_LIST_HEAD(lookup->q);
+ while (query != NULL) {
+ REQUIRE(DIG_VALID_QUERY(query));
+ next = ISC_LIST_NEXT(query, link);
+ if (query->sock != NULL) {
+ isc_socket_cancel(query->sock, global_task,
+ ISC_SOCKCANCEL_ALL);
+ check_if_done();
+ } else {
+ clear_query(query);
+ }
+ query = next;
+ }
+ lookup->pending = false;
+ lookup->retries = 0;
+}
+
+static void
+bringup_timer(dig_query_t *query, unsigned int default_timeout) {
+ dig_lookup_t *l;
+ unsigned int local_timeout;
+ isc_result_t result;
+ REQUIRE(DIG_VALID_QUERY(query));
+
+ debug("bringup_timer(%p)", query);
+ /*
+ * If the timer already exists, that means we're calling this
+ * a second time (for a retry). Don't need to recreate it,
+ * just reset it.
+ */
+ l = query->lookup;
+ if (ISC_LINK_LINKED(query, link) && ISC_LIST_NEXT(query, link) != NULL)
+ {
+ local_timeout = SERVER_TIMEOUT;
+ } else {
+ if (timeout == 0) {
+ local_timeout = default_timeout;
+ } else {
+ local_timeout = timeout;
+ }
+ }
+ debug("have local timeout of %d", local_timeout);
+ isc_interval_set(&l->interval, local_timeout, 0);
+ if (query->timer != NULL) {
+ isc_timer_destroy(&query->timer);
+ }
+ result = isc_timer_create(timermgr, isc_timertype_once, NULL,
+ &l->interval, global_task, connect_timeout,
+ query, &query->timer);
+ check_result(result, "isc_timer_create");
+}
+
+static void
+force_timeout(dig_query_t *query) {
+ isc_event_t *event;
+
+ debug("force_timeout(%p)", query);
+ event = isc_event_allocate(mctx, query, ISC_TIMEREVENT_IDLE,
+ connect_timeout, query, sizeof(isc_event_t));
+ isc_task_send(global_task, &event);
+
+ /*
+ * The timer may have expired if, for example, get_address() takes
+ * long time and the timer was running on a different thread.
+ * We need to cancel the possible timeout event not to confuse
+ * ourselves due to the duplicate events.
+ */
+ if (query->timer != NULL) {
+ isc_timer_destroy(&query->timer);
+ }
+}
+
+static void
+connect_done(isc_task_t *task, isc_event_t *event);
+
+/*%
+ * Unlike send_udp, this can't be called multiple times with the same
+ * query. When we retry TCP, we requeue the whole lookup, which should
+ * start anew.
+ */
+static void
+send_tcp_connect(dig_query_t *query) {
+ isc_result_t result;
+ dig_query_t *next;
+ dig_lookup_t *l;
+ REQUIRE(DIG_VALID_QUERY(query));
+
+ debug("send_tcp_connect(%p)", query);
+
+ l = query->lookup;
+ query->waiting_connect = true;
+ query->lookup->current_query = query;
+ result = get_address(query->servname, port, &query->sockaddr);
+ if (result != ISC_R_SUCCESS) {
+ /*
+ * This servname doesn't have an address. Try the next server
+ * by triggering an immediate 'timeout' (we lie, but the effect
+ * is the same).
+ */
+ force_timeout(query);
+ return;
+ }
+
+ if (!l->mapped && isc_sockaddr_pf(&query->sockaddr) == AF_INET6 &&
+ IN6_IS_ADDR_V4MAPPED(&query->sockaddr.type.sin6.sin6_addr))
+ {
+ isc_netaddr_t netaddr;
+ char buf[ISC_NETADDR_FORMATSIZE];
+
+ isc_netaddr_fromsockaddr(&netaddr, &query->sockaddr);
+ isc_netaddr_format(&netaddr, buf, sizeof(buf));
+ dighost_warning("Skipping mapped address '%s'", buf);
+
+ query->waiting_connect = false;
+ if (ISC_LINK_LINKED(query, link)) {
+ next = ISC_LIST_NEXT(query, link);
+ } else {
+ next = NULL;
+ }
+ l = query->lookup;
+ clear_query(query);
+ if (next == NULL) {
+ dighost_warning("No acceptable nameservers");
+ check_next_lookup(l);
+ return;
+ }
+ send_tcp_connect(next);
+ return;
+ }
+
+ INSIST(query->sock == NULL);
+
+ if (keep != NULL && isc_sockaddr_equal(&keepaddr, &query->sockaddr)) {
+ sockcount++;
+ isc_socket_attach(keep, &query->sock);
+ query->waiting_connect = false;
+ launch_next_query(query, true);
+ goto search;
+ }
+
+ result = isc_socket_create(socketmgr, isc_sockaddr_pf(&query->sockaddr),
+ isc_sockettype_tcp, &query->sock);
+ check_result(result, "isc_socket_create");
+ sockcount++;
+ debug("sockcount=%d", sockcount);
+ if (query->lookup->dscp != -1) {
+ isc_socket_dscp(query->sock, query->lookup->dscp);
+ }
+ isc_socket_ipv6only(query->sock, !query->lookup->mapped);
+ if (specified_source) {
+ result = isc_socket_bind(query->sock, &bind_address,
+ ISC_SOCKET_REUSEADDRESS);
+ } else {
+ if ((isc_sockaddr_pf(&query->sockaddr) == AF_INET) && have_ipv4)
+ {
+ isc_sockaddr_any(&bind_any);
+ } else {
+ isc_sockaddr_any6(&bind_any);
+ }
+ result = isc_socket_bind(query->sock, &bind_any, 0);
+ }
+ check_result(result, "isc_socket_bind");
+ bringup_timer(query, TCP_TIMEOUT);
+ result = isc_socket_connect(query->sock, &query->sockaddr, global_task,
+ connect_done, query);
+ check_result(result, "isc_socket_connect");
+search:
+ /*
+ * If we're at the endgame of a nameserver search, we need to
+ * immediately bring up all the queries. Do it here.
+ */
+ if (l->ns_search_only && !l->trace_root) {
+ debug("sending next, since searching");
+ if (ISC_LINK_LINKED(query, link)) {
+ next = ISC_LIST_NEXT(query, link);
+ ISC_LIST_DEQUEUE(l->q, query, link);
+ } else {
+ next = NULL;
+ }
+ ISC_LIST_ENQUEUE(l->connecting, query, clink);
+ if (next != NULL) {
+ send_tcp_connect(next);
+ }
+ }
+}
+
+static void
+print_query_size(dig_query_t *query) {
+ if (!yaml) {
+ printf(";; QUERY SIZE: %u\n\n",
+ isc_buffer_usedlength(&query->lookup->renderbuf));
+ }
+}
+
+/*%
+ * Send a UDP packet to the remote nameserver, possible starting the
+ * recv action as well. Also make sure that the timer is running and
+ * is properly reset.
+ */
+static void
+send_udp(dig_query_t *query) {
+ dig_lookup_t *l = NULL;
+ isc_result_t result;
+ dig_query_t *next;
+ isc_region_t r;
+ isc_socketevent_t *sevent;
+ REQUIRE(DIG_VALID_QUERY(query));
+
+ debug("send_udp(%p)", query);
+
+ l = query->lookup;
+ bringup_timer(query, UDP_TIMEOUT);
+ l->current_query = query;
+ debug("working on lookup %p, query %p", query->lookup, query);
+ if (!query->recv_made) {
+ /* XXX Check the sense of this, need assertion? */
+ query->waiting_connect = false;
+ result = get_address(query->servname, port, &query->sockaddr);
+ if (result != ISC_R_SUCCESS) {
+ /* This servname doesn't have an address. */
+ force_timeout(query);
+ return;
+ }
+
+ if (!l->mapped &&
+ isc_sockaddr_pf(&query->sockaddr) == AF_INET6 &&
+ IN6_IS_ADDR_V4MAPPED(&query->sockaddr.type.sin6.sin6_addr))
+ {
+ isc_netaddr_t netaddr;
+ char buf[ISC_NETADDR_FORMATSIZE];
+
+ isc_netaddr_fromsockaddr(&netaddr, &query->sockaddr);
+ isc_netaddr_format(&netaddr, buf, sizeof(buf));
+ dighost_warning("Skipping mapped address '%s'", buf);
+ next = ISC_LIST_NEXT(query, link);
+ l = query->lookup;
+ clear_query(query);
+ if (next == NULL) {
+ dighost_warning("No acceptable nameservers");
+ check_next_lookup(l);
+ } else {
+ send_udp(next);
+ }
+ return;
+ }
+
+ result = isc_socket_create(socketmgr,
+ isc_sockaddr_pf(&query->sockaddr),
+ isc_sockettype_udp, &query->sock);
+ check_result(result, "isc_socket_create");
+ sockcount++;
+ debug("sockcount=%d", sockcount);
+ if (query->lookup->dscp != -1) {
+ isc_socket_dscp(query->sock, query->lookup->dscp);
+ }
+ isc_socket_ipv6only(query->sock, !query->lookup->mapped);
+ if (specified_source) {
+ result = isc_socket_bind(query->sock, &bind_address,
+ ISC_SOCKET_REUSEADDRESS);
+ } else {
+ isc_sockaddr_anyofpf(&bind_any,
+ isc_sockaddr_pf(&query->sockaddr));
+ result = isc_socket_bind(query->sock, &bind_any, 0);
+ }
+ check_result(result, "isc_socket_bind");
+
+ query->recv_made = true;
+ isc_buffer_availableregion(&query->recvbuf, &r);
+ debug("recving with lookup=%p, query=%p, sock=%p",
+ query->lookup, query, query->sock);
+ result = isc_socket_recv(query->sock, &r, 1, global_task,
+ recv_done, query);
+ check_result(result, "isc_socket_recv");
+ recvcount++;
+ debug("recvcount=%d", recvcount);
+ }
+ isc_buffer_usedregion(&query->sendbuf, &r);
+ debug("sending a request");
+ if (query->lookup->use_usec) {
+ TIME_NOW_HIRES(&query->time_sent);
+ } else {
+ TIME_NOW(&query->time_sent);
+ }
+ INSIST(query->sock != NULL);
+ query->waiting_senddone = true;
+ sevent = isc_socket_socketevent(
+ mctx, query->sock, ISC_SOCKEVENT_SENDDONE, send_done, query);
+ result = isc_socket_sendto2(query->sock, &r, global_task,
+ &query->sockaddr, NULL, sevent,
+ ISC_SOCKFLAG_NORETRY);
+ check_result(result, "isc_socket_sendto2");
+ sendcount++;
+
+ /* XXX qrflag, print_query, etc... */
+ if (!ISC_LIST_EMPTY(query->lookup->q) && query->lookup->qr) {
+ extrabytes = 0;
+ dighost_printmessage(ISC_LIST_HEAD(query->lookup->q),
+ &query->lookup->renderbuf,
+ query->lookup->sendmsg, true);
+ if (query->lookup->stats) {
+ print_query_size(query);
+ }
+ }
+}
+
+/*%
+ * If there are more servers available for querying within 'lookup', initiate a
+ * TCP or UDP query to the next available server and return true; otherwise,
+ * return false.
+ */
+static bool
+try_next_server(dig_lookup_t *lookup) {
+ dig_query_t *current_query, *next_query;
+
+ current_query = lookup->current_query;
+ if (current_query == NULL || !ISC_LINK_LINKED(current_query, link)) {
+ return (false);
+ }
+
+ next_query = ISC_LIST_NEXT(current_query, link);
+ if (next_query == NULL) {
+ return (false);
+ }
+
+ debug("trying next server...");
+
+ if (lookup->tcp_mode) {
+ send_tcp_connect(next_query);
+ } else {
+ send_udp(next_query);
+ }
+
+ return (true);
+}
+
+/*%
+ * IO timeout handler, used for both connect and recv timeouts. If
+ * retries are still allowed, either resend the UDP packet or queue a
+ * new TCP lookup. Otherwise, cancel the lookup.
+ */
+static void
+connect_timeout(isc_task_t *task, isc_event_t *event) {
+ dig_lookup_t *l = NULL;
+ dig_query_t *query = NULL;
+
+ UNUSED(task);
+ REQUIRE(event->ev_type == ISC_TIMEREVENT_IDLE);
+
+ debug("connect_timeout(%p)", event->ev_arg);
+
+ LOCK_LOOKUP;
+ query = event->ev_arg;
+ REQUIRE(DIG_VALID_QUERY(query));
+ l = query->lookup;
+ isc_event_free(&event);
+
+ INSIST(!free_now);
+
+ if (cancel_now) {
+ UNLOCK_LOOKUP;
+ return;
+ }
+
+ if (try_next_server(l)) {
+ if (l->tcp_mode) {
+ if (query->sock != NULL) {
+ isc_socket_cancel(query->sock, NULL,
+ ISC_SOCKCANCEL_ALL);
+ } else {
+ clear_query(query);
+ }
+ }
+ UNLOCK_LOOKUP;
+ return;
+ }
+
+ if (l->tcp_mode && query->sock != NULL) {
+ query->timedout = true;
+ isc_socket_cancel(query->sock, NULL, ISC_SOCKCANCEL_ALL);
+ }
+
+ if (l->retries > 1) {
+ if (!l->tcp_mode) {
+ l->retries--;
+ debug("resending UDP request to first server");
+ send_udp(ISC_LIST_HEAD(l->q));
+ } else {
+ debug("making new TCP request, %d tries left",
+ l->retries);
+ l->retries--;
+ requeue_lookup(l, true);
+ cancel_lookup(l);
+ check_next_lookup(l);
+ }
+ } else {
+ if (l->ns_search_only) {
+ isc_netaddr_t netaddr;
+ char buf[ISC_NETADDR_FORMATSIZE];
+
+ isc_netaddr_fromsockaddr(&netaddr, &query->sockaddr);
+ isc_netaddr_format(&netaddr, buf, sizeof(buf));
+
+ dighost_error("no response from %s\n", buf);
+ } else {
+ fputs(l->cmdline, stdout);
+ dighost_error("connection timed out; "
+ "no servers could be reached\n");
+ }
+ cancel_lookup(l);
+ check_next_lookup(l);
+ if (exitcode < 9) {
+ exitcode = 9;
+ }
+ }
+ UNLOCK_LOOKUP;
+}
+
+/*%
+ * Called when a peer closes a TCP socket prematurely.
+ */
+static void
+requeue_or_update_exitcode(dig_lookup_t *lookup) {
+ if (lookup->eoferr == 0U && lookup->retries > 1) {
+ --lookup->retries;
+ /*
+ * Peer closed the connection prematurely for the first time
+ * for this lookup. Try again, keeping track of this failure.
+ */
+ dig_lookup_t *requeued_lookup = requeue_lookup(lookup, true);
+ requeued_lookup->eoferr++;
+ } else {
+ /*
+ * Peer closed the connection prematurely and it happened
+ * previously for this lookup. Indicate an error.
+ */
+ exitcode = 9;
+ }
+}
+
+/*%
+ * Event handler for the TCP recv which gets the length header of TCP
+ * packets. Start the next recv of length bytes.
+ */
+static void
+tcp_length_done(isc_task_t *task, isc_event_t *event) {
+ isc_socketevent_t *sevent;
+ isc_buffer_t b;
+ isc_region_t r;
+ isc_result_t result;
+ dig_query_t *query = NULL;
+ dig_lookup_t *l;
+ uint16_t length;
+
+ REQUIRE(event->ev_type == ISC_SOCKEVENT_RECVDONE);
+ INSIST(!free_now);
+
+ UNUSED(task);
+
+ debug("tcp_length_done(%p)", event->ev_arg);
+
+ LOCK_LOOKUP;
+ sevent = (isc_socketevent_t *)event;
+ query = event->ev_arg;
+ REQUIRE(DIG_VALID_QUERY(query));
+
+ recvcount--;
+ INSIST(recvcount >= 0);
+
+ if (sevent->result == ISC_R_CANCELED) {
+ isc_event_free(&event);
+ l = query->lookup;
+ clear_query(query);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ }
+ if (sevent->result != ISC_R_SUCCESS) {
+ char sockstr[ISC_SOCKADDR_FORMATSIZE];
+ isc_sockaddr_format(&query->sockaddr, sockstr, sizeof(sockstr));
+ dighost_error("communications error to %s: %s\n", sockstr,
+ isc_result_totext(sevent->result));
+ if (keep != NULL) {
+ isc_socket_detach(&keep);
+ }
+ l = query->lookup;
+ isc_socket_detach(&query->sock);
+ sockcount--;
+ debug("sockcount=%d", sockcount);
+ INSIST(sockcount >= 0);
+ if (sevent->result == ISC_R_EOF) {
+ requeue_or_update_exitcode(l);
+ }
+ isc_event_free(&event);
+ clear_query(query);
+ cancel_lookup(l);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ }
+ isc_buffer_init(&b, sevent->region.base, sevent->n);
+ isc_buffer_add(&b, sevent->n);
+ length = isc_buffer_getuint16(&b);
+
+ if (length == 0) {
+ isc_event_free(&event);
+ launch_next_query(query, false);
+ UNLOCK_LOOKUP;
+ return;
+ }
+
+ /*
+ * Even though the buffer was already init'ed, we need
+ * to redo it now, to force the length we want.
+ */
+ isc_buffer_invalidate(&query->recvbuf);
+ isc_buffer_init(&query->recvbuf, query->recvspace, length);
+ isc_buffer_availableregion(&query->recvbuf, &r);
+ debug("recving with lookup=%p, query=%p", query->lookup, query);
+ result = isc_socket_recv(query->sock, &r, length, task, recv_done,
+ query);
+ check_result(result, "isc_socket_recv");
+ recvcount++;
+ debug("resubmitted recv request with length %d, recvcount=%d", length,
+ recvcount);
+ isc_event_free(&event);
+ UNLOCK_LOOKUP;
+}
+
+/*%
+ * For transfers that involve multiple recvs (XFR's in particular),
+ * launch the next recv.
+ */
+static void
+launch_next_query(dig_query_t *query, bool include_question) {
+ isc_result_t result;
+ dig_lookup_t *l;
+ isc_region_t r;
+ REQUIRE(DIG_VALID_QUERY(query));
+
+ INSIST(!free_now);
+
+ debug("launch_next_query(%p)", query);
+
+ if (!query->lookup->pending) {
+ debug("ignoring launch_next_query because !pending");
+ isc_socket_detach(&query->sock);
+ sockcount--;
+ debug("sockcount=%d", sockcount);
+ INSIST(sockcount >= 0);
+ query->waiting_connect = false;
+ l = query->lookup;
+ clear_query(query);
+ check_next_lookup(l);
+ return;
+ }
+
+ isc_buffer_clear(&query->lengthbuf);
+ isc_buffer_availableregion(&query->lengthbuf, &r);
+ result = isc_socket_recv(query->sock, &r, 0, global_task,
+ tcp_length_done, query);
+ check_result(result, "isc_socket_recv");
+ recvcount++;
+ debug("recvcount=%d", recvcount);
+ if (!query->first_soa_rcvd) {
+ debug("sending a request in launch_next_query");
+ if (query->lookup->use_usec) {
+ TIME_NOW_HIRES(&query->time_sent);
+ } else {
+ TIME_NOW(&query->time_sent);
+ }
+ query->waiting_senddone = true;
+ isc_buffer_clear(&query->tmpsendbuf);
+ isc_buffer_putuint16(&query->tmpsendbuf,
+ isc_buffer_usedlength(&query->sendbuf));
+ if (include_question) {
+ isc_buffer_usedregion(&query->sendbuf, &r);
+ isc_buffer_copyregion(&query->tmpsendbuf, &r);
+ }
+ isc_buffer_usedregion(&query->tmpsendbuf, &r);
+ result = isc_socket_send(query->sock, &r, global_task,
+ send_done, query);
+ check_result(result, "isc_socket_send");
+ sendcount++;
+ debug("sendcount=%d", sendcount);
+
+ /* XXX qrflag, print_query, etc... */
+ if (!ISC_LIST_EMPTY(query->lookup->q) && query->lookup->qr) {
+ extrabytes = 0;
+ dighost_printmessage(ISC_LIST_HEAD(query->lookup->q),
+ &query->lookup->renderbuf,
+ query->lookup->sendmsg, true);
+ if (query->lookup->stats) {
+ print_query_size(query);
+ }
+ }
+ }
+ query->waiting_connect = false;
+#if 0
+ check_next_lookup(query->lookup);
+#endif /* if 0 */
+ return;
+}
+
+/*%
+ * Event handler for TCP connect complete. Make sure the connection was
+ * successful, then pass into launch_next_query to actually send the
+ * question.
+ */
+static void
+connect_done(isc_task_t *task, isc_event_t *event) {
+ char sockstr[ISC_SOCKADDR_FORMATSIZE];
+ isc_socketevent_t *sevent = NULL;
+ dig_query_t *query = NULL, *next;
+ dig_lookup_t *l;
+
+ UNUSED(task);
+
+ REQUIRE(event->ev_type == ISC_SOCKEVENT_CONNECT);
+ INSIST(!free_now);
+
+ debug("connect_done(%p)", event->ev_arg);
+
+ LOCK_LOOKUP;
+ sevent = (isc_socketevent_t *)event;
+ query = sevent->ev_arg;
+ REQUIRE(DIG_VALID_QUERY(query));
+
+ INSIST(query->waiting_connect);
+
+ query->waiting_connect = false;
+
+ if (sevent->result == ISC_R_CANCELED) {
+ debug("in cancel handler");
+ isc_sockaddr_format(&query->sockaddr, sockstr, sizeof(sockstr));
+ if (query->timedout) {
+ dighost_warning("Connection to %s(%s) for %s failed: "
+ "%s.",
+ sockstr, query->servname,
+ query->lookup->textname,
+ isc_result_totext(ISC_R_TIMEDOUT));
+ }
+ isc_socket_detach(&query->sock);
+ INSIST(sockcount > 0);
+ sockcount--;
+ debug("sockcount=%d", sockcount);
+ query->waiting_connect = false;
+ isc_event_free(&event);
+ l = query->lookup;
+ clear_query(query);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ }
+ if (sevent->result != ISC_R_SUCCESS) {
+ debug("unsuccessful connection: %s",
+ isc_result_totext(sevent->result));
+ isc_sockaddr_format(&query->sockaddr, sockstr, sizeof(sockstr));
+ if (sevent->result != ISC_R_CANCELED) {
+ dighost_warning("Connection to %s(%s) for %s failed: "
+ "%s.",
+ sockstr, query->servname,
+ query->lookup->textname,
+ isc_result_totext(sevent->result));
+ }
+ isc_socket_detach(&query->sock);
+ INSIST(sockcount > 0);
+ sockcount--;
+ /* XXX Clean up exitcodes */
+ if (exitcode < 9) {
+ exitcode = 9;
+ }
+ debug("sockcount=%d", sockcount);
+ query->waiting_connect = false;
+ isc_event_free(&event);
+ l = query->lookup;
+ if ((l->current_query != NULL) &&
+ (ISC_LINK_LINKED(l->current_query, link)))
+ {
+ next = ISC_LIST_NEXT(l->current_query, link);
+ } else {
+ next = NULL;
+ }
+ clear_query(query);
+ if (next != NULL) {
+ bringup_timer(next, TCP_TIMEOUT);
+ send_tcp_connect(next);
+ } else {
+ check_next_lookup(l);
+ }
+ UNLOCK_LOOKUP;
+ return;
+ }
+ exitcode = 0;
+ if (keep_open) {
+ if (keep != NULL) {
+ isc_socket_detach(&keep);
+ }
+ isc_socket_attach(query->sock, &keep);
+ keepaddr = query->sockaddr;
+ }
+ launch_next_query(query, true);
+ isc_event_free(&event);
+ UNLOCK_LOOKUP;
+}
+
+/*%
+ * Check if the ongoing XFR needs more data before it's complete, using
+ * the semantics of IXFR and AXFR protocols. Much of the complexity of
+ * this routine comes from determining when an IXFR is complete.
+ * false means more data is on the way, and the recv has been issued.
+ */
+static bool
+check_for_more_data(dig_query_t *query, dns_message_t *msg,
+ isc_socketevent_t *sevent) {
+ dns_rdataset_t *rdataset = NULL;
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ dns_rdata_soa_t soa;
+ uint32_t ixfr_serial = query->lookup->ixfr_serial, serial;
+ isc_result_t result;
+ bool ixfr = query->lookup->rdtype == dns_rdatatype_ixfr;
+ bool axfr = query->lookup->rdtype == dns_rdatatype_axfr;
+
+ if (ixfr) {
+ axfr = query->ixfr_axfr;
+ }
+
+ debug("check_for_more_data(%p)", query);
+
+ /*
+ * By the time we're in this routine, we know we're doing
+ * either an AXFR or IXFR. If there's no second_rr_type,
+ * then we don't yet know which kind of answer we got back
+ * from the server. Here, we're going to walk through the
+ * rr's in the message, acting as necessary whenever we hit
+ * an SOA rr.
+ */
+
+ query->msg_count++;
+ query->byte_count += sevent->n;
+ result = dns_message_firstname(msg, DNS_SECTION_ANSWER);
+ if (result != ISC_R_SUCCESS) {
+ puts("; Transfer failed.");
+ return (true);
+ }
+ do {
+ dns_name_t *name;
+ name = NULL;
+ dns_message_currentname(msg, DNS_SECTION_ANSWER, &name);
+ for (rdataset = ISC_LIST_HEAD(name->list); rdataset != NULL;
+ rdataset = ISC_LIST_NEXT(rdataset, link))
+ {
+ result = dns_rdataset_first(rdataset);
+ if (result != ISC_R_SUCCESS) {
+ continue;
+ }
+ do {
+ query->rr_count++;
+ dns_rdata_reset(&rdata);
+ dns_rdataset_current(rdataset, &rdata);
+ /*
+ * If this is the first rr, make sure
+ * it's an SOA
+ */
+ if ((!query->first_soa_rcvd) &&
+ (rdata.type != dns_rdatatype_soa))
+ {
+ puts("; Transfer failed. "
+ "Didn't start with SOA answer.");
+ return (true);
+ }
+ if ((!query->second_rr_rcvd) &&
+ (rdata.type != dns_rdatatype_soa))
+ {
+ query->second_rr_rcvd = true;
+ query->second_rr_serial = 0;
+ debug("got the second rr as nonsoa");
+ axfr = query->ixfr_axfr = true;
+ goto next_rdata;
+ }
+
+ /*
+ * If the record is anything except an SOA
+ * now, just continue on...
+ */
+ if (rdata.type != dns_rdatatype_soa) {
+ goto next_rdata;
+ }
+
+ /* Now we have an SOA. Work with it. */
+ debug("got an SOA");
+ result = dns_rdata_tostruct(&rdata, &soa, NULL);
+ check_result(result, "dns_rdata_tostruct");
+ serial = soa.serial;
+ dns_rdata_freestruct(&soa);
+ if (!query->first_soa_rcvd) {
+ query->first_soa_rcvd = true;
+ query->first_rr_serial = serial;
+ debug("this is the first serial %u",
+ serial);
+ if (ixfr &&
+ isc_serial_ge(ixfr_serial, serial))
+ {
+ debug("got up to date "
+ "response");
+ goto doexit;
+ }
+ goto next_rdata;
+ }
+ if (axfr) {
+ debug("doing axfr, got second SOA");
+ goto doexit;
+ }
+ if (!query->second_rr_rcvd) {
+ if (query->first_rr_serial == serial) {
+ debug("doing ixfr, got "
+ "empty zone");
+ goto doexit;
+ }
+ debug("this is the second serial %u",
+ serial);
+ query->second_rr_rcvd = true;
+ query->second_rr_serial = serial;
+ goto next_rdata;
+ }
+ /*
+ * If we get to this point, we're doing an
+ * IXFR and have to start really looking
+ * at serial numbers.
+ */
+ if (query->first_rr_serial == serial) {
+ debug("got a match for ixfr");
+ if (!query->first_repeat_rcvd) {
+ query->first_repeat_rcvd = true;
+ goto next_rdata;
+ }
+ debug("done with ixfr");
+ goto doexit;
+ }
+ debug("meaningless soa %u", serial);
+ next_rdata:
+ result = dns_rdataset_next(rdataset);
+ } while (result == ISC_R_SUCCESS);
+ }
+ result = dns_message_nextname(msg, DNS_SECTION_ANSWER);
+ } while (result == ISC_R_SUCCESS);
+ launch_next_query(query, false);
+ return (false);
+doexit:
+ dighost_received(sevent->n, &sevent->address, query);
+ return (true);
+}
+
+static void
+process_cookie(dig_lookup_t *l, dns_message_t *msg, isc_buffer_t *optbuf,
+ size_t optlen) {
+ char bb[256];
+ isc_buffer_t hexbuf;
+ size_t len;
+ const unsigned char *sent;
+ bool copy = true;
+ isc_result_t result;
+
+ if (l->cookie != NULL) {
+ isc_buffer_init(&hexbuf, bb, sizeof(bb));
+ result = isc_hex_decodestring(l->cookie, &hexbuf);
+ check_result(result, "isc_hex_decodestring");
+ sent = isc_buffer_base(&hexbuf);
+ len = isc_buffer_usedlength(&hexbuf);
+ } else {
+ sent = cookie;
+ len = sizeof(cookie);
+ }
+
+ INSIST(msg->cc_ok == 0 && msg->cc_bad == 0);
+ if (len >= 8 && optlen >= 8U) {
+ if (isc_safe_memequal(isc_buffer_current(optbuf), sent, 8)) {
+ msg->cc_ok = 1;
+ } else {
+ dighost_warning("Warning: Client COOKIE mismatch");
+ msg->cc_bad = 1;
+ copy = false;
+ }
+ } else {
+ dighost_warning("Warning: COOKIE bad token (too short)");
+ msg->cc_bad = 1;
+ copy = false;
+ }
+ if (copy) {
+ isc_region_t r;
+
+ r.base = isc_buffer_current(optbuf);
+ r.length = (unsigned int)optlen;
+ isc_buffer_init(&hexbuf, servercookie, sizeof(servercookie));
+ result = isc_hex_totext(&r, 2, "", &hexbuf);
+ check_result(result, "isc_hex_totext");
+ if (isc_buffer_availablelength(&hexbuf) > 0) {
+ isc_buffer_putuint8(&hexbuf, 0);
+ l->cookie = servercookie;
+ }
+ }
+ isc_buffer_forward(optbuf, (unsigned int)optlen);
+}
+
+static void
+process_opt(dig_lookup_t *l, dns_message_t *msg) {
+ dns_rdata_t rdata;
+ isc_result_t result;
+ isc_buffer_t optbuf;
+ uint16_t optcode, optlen;
+ dns_rdataset_t *opt = msg->opt;
+ bool seen_cookie = false;
+
+ result = dns_rdataset_first(opt);
+ if (result == ISC_R_SUCCESS) {
+ dns_rdata_init(&rdata);
+ dns_rdataset_current(opt, &rdata);
+ isc_buffer_init(&optbuf, rdata.data, rdata.length);
+ isc_buffer_add(&optbuf, rdata.length);
+ while (isc_buffer_remaininglength(&optbuf) >= 4) {
+ optcode = isc_buffer_getuint16(&optbuf);
+ optlen = isc_buffer_getuint16(&optbuf);
+ switch (optcode) {
+ case DNS_OPT_COOKIE:
+ /*
+ * Only process the first cookie option.
+ */
+ if (seen_cookie) {
+ isc_buffer_forward(&optbuf, optlen);
+ break;
+ }
+ process_cookie(l, msg, &optbuf, optlen);
+ seen_cookie = true;
+ break;
+ default:
+ isc_buffer_forward(&optbuf, optlen);
+ break;
+ }
+ }
+ }
+}
+
+static int
+ednsvers(dns_rdataset_t *opt) {
+ return ((opt->ttl >> 16) & 0xff);
+}
+
+/*%
+ * Event handler for recv complete. Perform whatever actions are necessary,
+ * based on the specifics of the user's request.
+ */
+static void
+recv_done(isc_task_t *task, isc_event_t *event) {
+ isc_socketevent_t *sevent = NULL;
+ isc_region_t r;
+ dig_query_t *query = NULL;
+ isc_buffer_t b;
+ dns_message_t *msg = NULL;
+ isc_result_t result;
+ dig_lookup_t *n, *l;
+ bool docancel = false;
+ bool match = true;
+ bool done_process_opt = false;
+ unsigned int parseflags;
+ dns_messageid_t id;
+ unsigned int msgflags;
+ int newedns;
+
+ UNUSED(task);
+ INSIST(!free_now);
+
+ debug("recv_done(%p)", event->ev_arg);
+
+ LOCK_LOOKUP;
+ recvcount--;
+ debug("recvcount=%d", recvcount);
+ INSIST(recvcount >= 0);
+
+ query = event->ev_arg;
+ if (query->lookup->use_usec) {
+ TIME_NOW_HIRES(&query->time_recv);
+ } else {
+ TIME_NOW(&query->time_recv);
+ }
+
+ l = query->lookup;
+
+ REQUIRE(event->ev_type == ISC_SOCKEVENT_RECVDONE);
+ sevent = (isc_socketevent_t *)event;
+
+ isc_buffer_init(&b, sevent->region.base, sevent->n);
+ isc_buffer_add(&b, sevent->n);
+
+ if ((l->tcp_mode) && (query->timer != NULL)) {
+ isc_timer_touch(query->timer);
+ }
+ if ((!l->pending && !l->ns_search_only) || cancel_now) {
+ debug("no longer pending. Got %s",
+ isc_result_totext(sevent->result));
+ query->waiting_connect = false;
+
+ isc_event_free(&event);
+ clear_query(query);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ }
+
+ if (sevent->result != ISC_R_SUCCESS) {
+ if (sevent->result == ISC_R_CANCELED) {
+ debug("in recv cancel handler");
+ query->waiting_connect = false;
+ } else {
+ dighost_error("communications error: %s\n",
+ isc_result_totext(sevent->result));
+ if (keep != NULL) {
+ isc_socket_detach(&keep);
+ }
+ isc_socket_detach(&query->sock);
+ sockcount--;
+ debug("sockcount=%d", sockcount);
+ INSIST(sockcount >= 0);
+ }
+ if (sevent->result == ISC_R_EOF) {
+ requeue_or_update_exitcode(l);
+ }
+ isc_event_free(&event);
+ clear_query(query);
+ cancel_lookup(l);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ }
+
+ if (!l->tcp_mode &&
+ !isc_sockaddr_compare(&sevent->address, &query->sockaddr,
+ ISC_SOCKADDR_CMPADDR | ISC_SOCKADDR_CMPPORT |
+ ISC_SOCKADDR_CMPSCOPE |
+ ISC_SOCKADDR_CMPSCOPEZERO))
+ {
+ char buf1[ISC_SOCKADDR_FORMATSIZE];
+ char buf2[ISC_SOCKADDR_FORMATSIZE];
+ isc_sockaddr_t any;
+
+ if (isc_sockaddr_pf(&query->sockaddr) == AF_INET) {
+ isc_sockaddr_any(&any);
+ } else {
+ isc_sockaddr_any6(&any);
+ }
+
+ /*
+ * We don't expect a match when the packet is
+ * sent to 0.0.0.0, :: or to a multicast addresses.
+ * XXXMPA broadcast needs to be handled here as well.
+ */
+ if ((!isc_sockaddr_eqaddr(&query->sockaddr, &any) &&
+ !isc_sockaddr_ismulticast(&query->sockaddr)) ||
+ isc_sockaddr_getport(&query->sockaddr) !=
+ isc_sockaddr_getport(&sevent->address))
+ {
+ isc_sockaddr_format(&sevent->address, buf1,
+ sizeof(buf1));
+ isc_sockaddr_format(&query->sockaddr, buf2,
+ sizeof(buf2));
+ dighost_warning("reply from unexpected source: %s,"
+ " expected %s\n",
+ buf1, buf2);
+ if (!l->accept_reply_unexpected_src) {
+ match = false;
+ }
+ }
+ }
+
+ result = dns_message_peekheader(&b, &id, &msgflags);
+ if (result != ISC_R_SUCCESS || l->sendmsg->id != id) {
+ match = false;
+ if (l->tcp_mode) {
+ bool fail = true;
+ if (result == ISC_R_SUCCESS) {
+ if ((!query->first_soa_rcvd || query->warn_id))
+ {
+ dighost_warning("%s: ID mismatch: "
+ "expected ID %u, got "
+ "%u",
+ query->first_soa_rcvd
+ ? "WARNING"
+ : "ERROR",
+ l->sendmsg->id, id);
+ }
+ if (query->first_soa_rcvd) {
+ fail = false;
+ }
+ query->warn_id = false;
+ } else {
+ dighost_warning("ERROR: short (< header size) "
+ "message");
+ }
+ if (fail) {
+ isc_event_free(&event);
+ clear_query(query);
+ cancel_lookup(l);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ }
+ match = true;
+ } else if (result == ISC_R_SUCCESS) {
+ dighost_warning("Warning: ID mismatch: expected ID %u,"
+ " got %u",
+ l->sendmsg->id, id);
+ } else {
+ dighost_warning("Warning: short (< header size) "
+ "message received");
+ }
+ }
+
+ if (result == ISC_R_SUCCESS && (msgflags & DNS_MESSAGEFLAG_QR) == 0) {
+ dighost_warning("Warning: query response not set");
+ }
+
+ if (!match) {
+ goto udp_mismatch;
+ }
+
+ dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &msg);
+
+ if (tsigkey != NULL) {
+ if (l->querysig == NULL) {
+ debug("getting initial querysig");
+ result = dns_message_getquerytsig(l->sendmsg, mctx,
+ &l->querysig);
+ check_result(result, "dns_message_getquerytsig");
+ }
+ result = dns_message_setquerytsig(msg, l->querysig);
+ check_result(result, "dns_message_setquerytsig");
+ result = dns_message_settsigkey(msg, tsigkey);
+ check_result(result, "dns_message_settsigkey");
+ msg->tsigctx = l->tsigctx;
+ l->tsigctx = NULL;
+ if (l->msgcounter != 0) {
+ msg->tcp_continuation = 1;
+ }
+ l->msgcounter++;
+ }
+
+ debug("before parse starts");
+ parseflags = DNS_MESSAGEPARSE_PRESERVEORDER;
+ if (l->besteffort) {
+ parseflags |= DNS_MESSAGEPARSE_BESTEFFORT;
+ parseflags |= DNS_MESSAGEPARSE_IGNORETRUNCATION;
+ }
+ result = dns_message_parse(msg, &b, parseflags);
+ if (result == DNS_R_RECOVERABLE) {
+ dighost_warning("Warning: Message parser reports malformed "
+ "message packet.");
+ result = ISC_R_SUCCESS;
+ }
+ if (result != ISC_R_SUCCESS) {
+ if (!yaml) {
+ printf(";; Got bad packet: %s\n",
+ isc_result_totext(result));
+ hex_dump(&b);
+ }
+ query->waiting_connect = false;
+ dns_message_detach(&msg);
+ isc_event_free(&event);
+ clear_query(query);
+ cancel_lookup(l);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ }
+ if (msg->opcode != l->opcode) {
+ char expect[20] = { 0 }, got[20] = { 0 };
+
+ isc_buffer_init(&b, &expect, sizeof(expect));
+ result = dns_opcode_totext(l->opcode, &b);
+ check_result(result, "dns_opcode_totext");
+
+ isc_buffer_init(&b, &got, sizeof(got));
+ result = dns_opcode_totext(msg->opcode, &b);
+ check_result(result, "dns_opcode_totext");
+
+ dighost_warning("Warning: Opcode mismatch: expected %s, got %s",
+ expect, got);
+
+ dns_message_detach(&msg);
+ if (l->tcp_mode) {
+ isc_event_free(&event);
+ clear_query(query);
+ cancel_lookup(l);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ } else {
+ goto udp_mismatch;
+ }
+ }
+ if (msg->counts[DNS_SECTION_QUESTION] != 0) {
+ match = true;
+ for (result = dns_message_firstname(msg, DNS_SECTION_QUESTION);
+ result == ISC_R_SUCCESS && match;
+ result = dns_message_nextname(msg, DNS_SECTION_QUESTION))
+ {
+ dns_name_t *name = NULL;
+ dns_rdataset_t *rdataset;
+
+ dns_message_currentname(msg, DNS_SECTION_QUESTION,
+ &name);
+ for (rdataset = ISC_LIST_HEAD(name->list);
+ rdataset != NULL;
+ rdataset = ISC_LIST_NEXT(rdataset, link))
+ {
+ if (l->rdtype != rdataset->type ||
+ l->rdclass != rdataset->rdclass ||
+ !dns_name_equal(l->name, name))
+ {
+ char namestr[DNS_NAME_FORMATSIZE];
+ char typebuf[DNS_RDATATYPE_FORMATSIZE];
+ char classbuf[DNS_RDATACLASS_FORMATSIZE];
+ dns_name_format(name, namestr,
+ sizeof(namestr));
+ dns_rdatatype_format(rdataset->type,
+ typebuf,
+ sizeof(typebuf));
+ dns_rdataclass_format(rdataset->rdclass,
+ classbuf,
+ sizeof(classbuf));
+ dighost_warning(";; Question section "
+ "mismatch: got "
+ "%s/%s/%s",
+ namestr, typebuf,
+ classbuf);
+ match = false;
+ }
+ }
+ }
+ if (!match) {
+ dns_message_detach(&msg);
+ if (l->tcp_mode) {
+ isc_event_free(&event);
+ clear_query(query);
+ cancel_lookup(l);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ } else {
+ goto udp_mismatch;
+ }
+ }
+ }
+ if (msg->rcode == dns_rcode_badvers && msg->opt != NULL &&
+ (newedns = ednsvers(msg->opt)) < l->edns && l->ednsneg)
+ {
+ /*
+ * Add minimum EDNS version required checks here if needed.
+ */
+ dighost_comments(l, "BADVERS, retrying with EDNS version %u.",
+ (unsigned int)newedns);
+ l->edns = newedns;
+ n = requeue_lookup(l, true);
+ if (l->trace && l->trace_root) {
+ n->rdtype = l->qrdtype;
+ }
+ dns_message_detach(&msg);
+ isc_event_free(&event);
+ clear_query(query);
+ cancel_lookup(l);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ }
+ if ((msg->flags & DNS_MESSAGEFLAG_TC) != 0 && !l->ignore &&
+ !l->tcp_mode)
+ {
+ if (l->cookie == NULL && l->sendcookie && msg->opt != NULL) {
+ process_opt(l, msg);
+ }
+ dighost_comments(l, "Truncated, retrying in TCP mode.");
+ n = requeue_lookup(l, true);
+ n->tcp_mode = true;
+ if (l->trace && l->trace_root) {
+ n->rdtype = l->qrdtype;
+ }
+ dns_message_detach(&msg);
+ isc_event_free(&event);
+ clear_query(query);
+ cancel_lookup(l);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ }
+ if (msg->rcode == dns_rcode_badcookie && !l->tcp_mode &&
+ l->sendcookie && l->badcookie)
+ {
+ process_opt(l, msg);
+ if (msg->cc_ok) {
+ dighost_comments(l, "BADCOOKIE, retrying%s.",
+ l->seenbadcookie ? " in TCP mode"
+ : "");
+ n = requeue_lookup(l, true);
+ if (l->seenbadcookie) {
+ n->tcp_mode = true;
+ }
+ n->seenbadcookie = true;
+ if (l->trace && l->trace_root) {
+ n->rdtype = l->qrdtype;
+ }
+ dns_message_detach(&msg);
+ isc_event_free(&event);
+ clear_query(query);
+ cancel_lookup(l);
+ check_next_lookup(l);
+ UNLOCK_LOOKUP;
+ return;
+ }
+ done_process_opt = true;
+ }
+ if ((msg->rcode == dns_rcode_servfail && !l->servfail_stops) ||
+ (check_ra && (msg->flags & DNS_MESSAGEFLAG_RA) == 0 && l->recurse))
+ {
+ dig_query_t *next = ISC_LIST_NEXT(query, link);
+ if (l->current_query == query) {
+ l->current_query = NULL;
+ }
+ if (next != NULL) {
+ debug("sending query %p\n", next);
+ if (l->tcp_mode) {
+ send_tcp_connect(next);
+ } else {
+ send_udp(next);
+ }
+ }
+ /*
+ * If our query is at the head of the list and there
+ * is no next, we're the only one left, so fall
+ * through to print the message.
+ */
+ if ((ISC_LIST_HEAD(l->q) != query) ||
+ (ISC_LIST_NEXT(query, link) != NULL))
+ {
+ dighost_comments(l,
+ "Got %s from %s, trying next "
+ "server",
+ msg->rcode == dns_rcode_servfail
+ ? "SERVFAIL reply"
+ : "recursion not available",
+ query->servname);
+ clear_query(query);
+ check_next_lookup(l);
+ dns_message_detach(&msg);
+ isc_event_free(&event);
+ UNLOCK_LOOKUP;
+ return;
+ }
+ }
+
+ if (tsigkey != NULL) {
+ result = dns_tsig_verify(&b, msg, NULL, NULL);
+ if (result != ISC_R_SUCCESS) {
+ dighost_warning("Couldn't verify signature: %s",
+ isc_result_totext(result));
+ validated = false;
+ }
+ l->tsigctx = msg->tsigctx;
+ msg->tsigctx = NULL;
+ if (l->querysig != NULL) {
+ debug("freeing querysig buffer %p", l->querysig);
+ isc_buffer_free(&l->querysig);
+ }
+ result = dns_message_getquerytsig(msg, mctx, &l->querysig);
+ check_result(result, "dns_message_getquerytsig");
+ }
+
+ extrabytes = isc_buffer_remaininglength(&b);
+
+ debug("after parse");
+ if (l->doing_xfr && l->xfr_q == NULL) {
+ l->xfr_q = query;
+ /*
+ * Once we are in the XFR message, increase
+ * the timeout to much longer, so brief network
+ * outages won't cause the XFR to abort
+ */
+ if (timeout != INT_MAX && query->timer != NULL) {
+ unsigned int local_timeout;
+
+ if (timeout == 0) {
+ if (l->tcp_mode) {
+ local_timeout = TCP_TIMEOUT * 4;
+ } else {
+ local_timeout = UDP_TIMEOUT * 4;
+ }
+ } else {
+ if (timeout < (INT_MAX / 4)) {
+ local_timeout = timeout * 4;
+ } else {
+ local_timeout = INT_MAX;
+ }
+ }
+ debug("have local timeout of %d", local_timeout);
+ isc_interval_set(&l->interval, local_timeout, 0);
+ result = isc_timer_reset(query->timer,
+ isc_timertype_once, NULL,
+ &l->interval, false);
+ check_result(result, "isc_timer_reset");
+ }
+ }
+
+ if (!done_process_opt) {
+ if (l->cookie != NULL) {
+ if (msg->opt == NULL) {
+ dighost_warning("expected opt record in "
+ "response");
+ } else {
+ process_opt(l, msg);
+ }
+ } else if (l->sendcookie && msg->opt != NULL) {
+ process_opt(l, msg);
+ }
+ }
+ if (!l->doing_xfr || l->xfr_q == query) {
+ if (msg->rcode == dns_rcode_nxdomain &&
+ (l->origin != NULL || l->need_search))
+ {
+ if (!next_origin(query->lookup) || showsearch) {
+ dighost_printmessage(query, &b, msg, true);
+ dighost_received(isc_buffer_usedlength(&b),
+ &sevent->address, query);
+ }
+ } else if (!l->trace && !l->ns_search_only) {
+ dighost_printmessage(query, &b, msg, true);
+ } else if (l->trace) {
+ int nl = 0;
+ int count = msg->counts[DNS_SECTION_ANSWER];
+
+ debug("in TRACE code");
+ if (!l->ns_search_only) {
+ dighost_printmessage(query, &b, msg, true);
+ }
+
+ l->rdtype = l->qrdtype;
+ if (l->trace_root || (l->ns_search_only && count > 0)) {
+ if (!l->trace_root) {
+ l->rdtype = dns_rdatatype_soa;
+ }
+ nl = followup_lookup(msg, query,
+ DNS_SECTION_ANSWER);
+ l->trace_root = false;
+ } else if (count == 0) {
+ nl = followup_lookup(msg, query,
+ DNS_SECTION_AUTHORITY);
+ }
+ if (nl == 0) {
+ docancel = true;
+ }
+ } else {
+ debug("in NSSEARCH code");
+
+ if (l->trace_root) {
+ /*
+ * This is the initial NS query.
+ */
+ int nl;
+
+ l->rdtype = dns_rdatatype_soa;
+ nl = followup_lookup(msg, query,
+ DNS_SECTION_ANSWER);
+ if (nl == 0) {
+ docancel = true;
+ }
+ l->trace_root = false;
+ usesearch = false;
+ } else {
+ dighost_printmessage(query, &b, msg, true);
+ }
+ }
+ }
+
+ if (l->pending) {
+ debug("still pending.");
+ }
+ if (l->doing_xfr) {
+ if (query != l->xfr_q) {
+ dns_message_detach(&msg);
+ isc_event_free(&event);
+ query->waiting_connect = false;
+ UNLOCK_LOOKUP;
+ return;
+ }
+ if (!docancel) {
+ docancel = check_for_more_data(query, msg, sevent);
+ }
+ if (docancel) {
+ dns_message_detach(&msg);
+ clear_query(query);
+ cancel_lookup(l);
+ check_next_lookup(l);
+ }
+ } else {
+ if (msg->rcode == dns_rcode_noerror || l->origin == NULL) {
+ dighost_received(isc_buffer_usedlength(&b),
+ &sevent->address, query);
+ }
+
+ if (!query->lookup->ns_search_only) {
+ query->lookup->pending = false;
+ }
+ if (!query->lookup->ns_search_only ||
+ query->lookup->trace_root || docancel)
+ {
+ dns_message_detach(&msg);
+ cancel_lookup(l);
+ }
+ clear_query(query);
+ check_next_lookup(l);
+ }
+ if (msg != NULL) {
+ dns_message_detach(&msg);
+ }
+ isc_event_free(&event);
+ UNLOCK_LOOKUP;
+ return;
+
+udp_mismatch:
+ isc_buffer_invalidate(&query->recvbuf);
+ isc_buffer_init(&query->recvbuf, query->recvspace, COMMSIZE);
+ isc_buffer_availableregion(&query->recvbuf, &r);
+ result = isc_socket_recv(query->sock, &r, 1, global_task, recv_done,
+ query);
+ check_result(result, "isc_socket_recv");
+ recvcount++;
+ isc_event_free(&event);
+ UNLOCK_LOOKUP;
+ return;
+}
+
+/*%
+ * Turn a name into an address, using system-supplied routines. This is
+ * used in looking up server names, etc... and needs to use system-supplied
+ * routines, since they may be using a non-DNS system for these lookups.
+ */
+isc_result_t
+get_address(char *host, in_port_t myport, isc_sockaddr_t *sockaddr) {
+ int count;
+ isc_result_t result;
+ bool is_running;
+
+ is_running = isc_app_isrunning();
+ if (is_running) {
+ isc_app_block();
+ }
+ result = bind9_getaddresses(host, myport, sockaddr, 1, &count);
+ if (is_running) {
+ isc_app_unblock();
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ INSIST(count == 1);
+
+ return (ISC_R_SUCCESS);
+}
+
+int
+getaddresses(dig_lookup_t *lookup, const char *host, isc_result_t *resultp) {
+ isc_result_t result;
+ isc_sockaddr_t sockaddrs[DIG_MAX_ADDRESSES];
+ isc_netaddr_t netaddr;
+ int count, i;
+ dig_server_t *srv;
+ char tmp[ISC_NETADDR_FORMATSIZE];
+
+ result = bind9_getaddresses(host, 0, sockaddrs, DIG_MAX_ADDRESSES,
+ &count);
+ if (resultp != NULL) {
+ *resultp = result;
+ }
+ if (result != ISC_R_SUCCESS) {
+ if (resultp == NULL) {
+ fatal("couldn't get address for '%s': %s", host,
+ isc_result_totext(result));
+ }
+ return (0);
+ }
+
+ for (i = 0; i < count; i++) {
+ isc_netaddr_fromsockaddr(&netaddr, &sockaddrs[i]);
+ isc_netaddr_format(&netaddr, tmp, sizeof(tmp));
+ srv = make_server(tmp, host);
+ ISC_LIST_APPEND(lookup->my_server_list, srv, link);
+ }
+
+ return (count);
+}
+
+/*%
+ * Initiate either a TCP or UDP lookup
+ */
+void
+do_lookup(dig_lookup_t *lookup) {
+ dig_query_t *query;
+
+ REQUIRE(lookup != NULL);
+
+ debug("do_lookup(%p)", lookup);
+ lookup->pending = true;
+ query = ISC_LIST_HEAD(lookup->q);
+ if (query != NULL) {
+ REQUIRE(DIG_VALID_QUERY(query));
+ if (lookup->tcp_mode) {
+ send_tcp_connect(query);
+ } else {
+ send_udp(query);
+ }
+ }
+}
+
+/*%
+ * Start everything in action upon task startup.
+ */
+void
+onrun_callback(isc_task_t *task, isc_event_t *event) {
+ UNUSED(task);
+
+ isc_event_free(&event);
+ LOCK_LOOKUP;
+ start_lookup();
+ UNLOCK_LOOKUP;
+}
+
+/*%
+ * Make everything on the lookup queue go away. Mainly used by the
+ * SIGINT handler.
+ */
+void
+cancel_all(void) {
+ dig_lookup_t *l, *n;
+ dig_query_t *q, *nq;
+
+ debug("cancel_all()");
+
+ LOCK_LOOKUP;
+ if (free_now) {
+ UNLOCK_LOOKUP;
+ return;
+ }
+ cancel_now = true;
+ if (current_lookup != NULL) {
+ for (q = ISC_LIST_HEAD(current_lookup->q); q != NULL; q = nq) {
+ nq = ISC_LIST_NEXT(q, link);
+ debug("canceling pending query %p, belonging to %p", q,
+ current_lookup);
+ if (q->sock != NULL) {
+ isc_socket_cancel(q->sock, NULL,
+ ISC_SOCKCANCEL_ALL);
+ } else {
+ clear_query(q);
+ }
+ }
+ for (q = ISC_LIST_HEAD(current_lookup->connecting); q != NULL;
+ q = nq)
+ {
+ nq = ISC_LIST_NEXT(q, clink);
+ debug("canceling connecting query %p, belonging to %p",
+ q, current_lookup);
+ if (q->sock != NULL) {
+ isc_socket_cancel(q->sock, NULL,
+ ISC_SOCKCANCEL_ALL);
+ } else {
+ clear_query(q);
+ }
+ }
+ }
+ l = ISC_LIST_HEAD(lookup_list);
+ while (l != NULL) {
+ n = ISC_LIST_NEXT(l, link);
+ ISC_LIST_DEQUEUE(lookup_list, l, link);
+ try_clear_lookup(l);
+ l = n;
+ }
+ UNLOCK_LOOKUP;
+}
+
+/*%
+ * Destroy all of the libs we are using, and get everything ready for a
+ * clean shutdown.
+ */
+void
+destroy_libs(void) {
+#ifdef HAVE_LIBIDN2
+ isc_result_t result;
+#endif /* HAVE_LIBIDN2 */
+
+ if (keep != NULL) {
+ isc_socket_detach(&keep);
+ }
+ debug("destroy_libs()");
+ if (global_task != NULL) {
+ debug("freeing task");
+ isc_task_detach(&global_task);
+ }
+
+ if (taskmgr != NULL) {
+ debug("freeing taskmgr");
+ isc_managers_destroy(&netmgr, &taskmgr);
+ }
+ LOCK_LOOKUP;
+ REQUIRE(sockcount == 0);
+ REQUIRE(recvcount == 0);
+ REQUIRE(sendcount == 0);
+
+ INSIST(ISC_LIST_HEAD(lookup_list) == NULL);
+ INSIST(current_lookup == NULL);
+ INSIST(!free_now);
+
+ free_now = true;
+
+ flush_server_list();
+
+ clear_searchlist();
+
+#ifdef HAVE_LIBIDN2
+ result = dns_name_settotextfilter(NULL);
+ check_result(result, "dns_name_settotextfilter");
+#endif /* HAVE_LIBIDN2 */
+
+ if (socketmgr != NULL) {
+ debug("freeing socketmgr");
+ isc_socketmgr_destroy(&socketmgr);
+ }
+ if (timermgr != NULL) {
+ debug("freeing timermgr");
+ isc_timermgr_destroy(&timermgr);
+ }
+ if (tsigkey != NULL) {
+ debug("freeing key %p", tsigkey);
+ dns_tsigkey_detach(&tsigkey);
+ }
+ if (namebuf != NULL) {
+ isc_buffer_free(&namebuf);
+ }
+
+ if (is_dst_up) {
+ debug("destroy DST lib");
+ dst_lib_destroy();
+ is_dst_up = false;
+ }
+
+ UNLOCK_LOOKUP;
+ isc_mutex_destroy(&lookup_lock);
+ debug("Removing log context");
+ isc_log_destroy(&lctx);
+
+ debug("Destroy memory");
+ if (memdebugging != 0) {
+ isc_mem_stats(mctx, stderr);
+ }
+ if (mctx != NULL) {
+ isc_mem_destroy(&mctx);
+ }
+}
+
+#ifdef HAVE_LIBIDN2
+static isc_result_t
+idn_output_filter(isc_buffer_t *buffer, unsigned int used_org) {
+ char src[MXNAME], *dst = NULL;
+ size_t srclen, dstlen;
+ isc_result_t result = ISC_R_SUCCESS;
+
+ /*
+ * Copy name from 'buffer' to 'src' and terminate it with NULL.
+ */
+ srclen = isc_buffer_usedlength(buffer) - used_org;
+ if (srclen >= sizeof(src)) {
+ warn("Input name too long to perform IDN conversion");
+ goto cleanup;
+ }
+ memmove(src, (char *)isc_buffer_base(buffer) + used_org, srclen);
+ src[srclen] = '\0';
+
+ systemlocale(LC_ALL);
+
+ /*
+ * Convert 'src' to the current locale's character encoding.
+ */
+ idn_ace_to_locale(src, &dst);
+
+ resetlocale(LC_ALL);
+
+ /*
+ * Check whether the converted name will fit back into 'buffer'.
+ */
+ dstlen = strlen(dst);
+ if (isc_buffer_length(buffer) < used_org + dstlen) {
+ result = ISC_R_NOSPACE;
+ goto cleanup;
+ }
+
+ /*
+ * Put the converted name back into 'buffer'.
+ */
+ isc_buffer_subtract(buffer, srclen);
+ memmove(isc_buffer_used(buffer), dst, dstlen);
+ isc_buffer_add(buffer, dstlen);
+
+ /*
+ * Clean up.
+ */
+cleanup:
+ if (dst != NULL) {
+ idn2_free(dst);
+ }
+
+ return (result);
+}
+
+/*%
+ * Convert 'src', which is a string using the current locale's character
+ * encoding, into an ACE string suitable for use in the DNS, storing the
+ * conversion result in 'dst', which is 'dstlen' bytes large.
+ *
+ * 'dst' MUST be large enough to hold any valid domain name.
+ */
+static void
+idn_locale_to_ace(const char *src, char *dst, size_t dstlen) {
+ const char *final_src;
+ char *ascii_src;
+ int res;
+
+ systemlocale(LC_ALL);
+
+ /*
+ * We trust libidn2 to return an error if 'src' is too large to be a
+ * valid domain name.
+ */
+ res = idn2_to_ascii_lz(src, &ascii_src, IDN2_NONTRANSITIONAL);
+ if (res == IDN2_DISALLOWED) {
+ res = idn2_to_ascii_lz(src, &ascii_src, IDN2_TRANSITIONAL);
+ }
+ if (res != IDN2_OK) {
+ fatal("'%s' is not a legal IDNA2008 name (%s), use +noidnin",
+ src, idn2_strerror(res));
+ }
+
+ /*
+ * idn2_to_ascii_lz() normalizes all strings to lower case, but we
+ * generally don't want to lowercase all input strings; make sure to
+ * return the original case if the two strings differ only in case.
+ */
+ final_src = (strcasecmp(src, ascii_src) == 0 ? src : ascii_src);
+
+ (void)strlcpy(dst, final_src, dstlen);
+
+ idn2_free(ascii_src);
+
+ resetlocale(LC_ALL);
+}
+
+/*%
+ * Convert 'src', which is an ACE string suitable for use in the DNS, into a
+ * string using the current locale's character encoding, storing the conversion
+ * result in 'dst'.
+ *
+ * The caller MUST subsequently release 'dst' using idn2_free().
+ */
+static void
+idn_ace_to_locale(const char *src, char **dst) {
+ char *local_src, *utf8_src;
+ int res;
+
+ systemlocale(LC_ALL);
+
+ /*
+ * We need to:
+ *
+ * 1) check whether 'src' is a valid IDNA2008 name,
+ * 2) if it is, output it in the current locale's character encoding.
+ *
+ * Unlike idn2_to_ascii_*(), idn2_to_unicode_*() functions are unable
+ * to perform IDNA2008 validity checks. Thus, we need to decode any
+ * Punycode in 'src', check if the resulting name is a valid IDNA2008
+ * name, and only once we ensure it is, output that name in the current
+ * locale's character encoding.
+ *
+ * We could just use idn2_to_unicode_8zlz() + idn2_to_ascii_lz(), but
+ * then we would not be able to universally tell invalid names and
+ * character encoding errors apart (if the current locale uses ASCII
+ * for character encoding, the former function would fail even for a
+ * valid IDNA2008 name, as long as it contained any non-ASCII
+ * character). Thus, we need to take a longer route.
+ *
+ * First, convert 'src' to UTF-8, ignoring the current locale.
+ */
+ res = idn2_to_unicode_8z8z(src, &utf8_src, 0);
+ if (res != IDN2_OK) {
+ fatal("Bad ACE string '%s' (%s), use +noidnout", src,
+ idn2_strerror(res));
+ }
+
+ /*
+ * Then, check whether decoded 'src' is a valid IDNA2008 name
+ * and if disallowed character is found, fallback to IDNA2003.
+ */
+ res = idn2_to_ascii_8z(utf8_src, NULL, IDN2_NONTRANSITIONAL);
+ if (res == IDN2_DISALLOWED) {
+ res = idn2_to_ascii_8z(utf8_src, NULL, IDN2_TRANSITIONAL);
+ }
+ if (res != IDN2_OK) {
+ fatal("'%s' is not a legal IDNA2008 name (%s), use +noidnout",
+ src, idn2_strerror(res));
+ }
+
+ /*
+ * Finally, try converting the decoded 'src' into the current locale's
+ * character encoding.
+ */
+ res = idn2_to_unicode_8zlz(utf8_src, &local_src, 0);
+ if (res != IDN2_OK) {
+ static bool warned = false;
+
+ res = idn2_to_ascii_8z(utf8_src, &local_src, 0);
+ if (res != IDN2_OK) {
+ fatal("Cannot represent '%s' "
+ "in the current locale nor ascii (%s), "
+ "use +noidnout or a different locale",
+ src, idn2_strerror(res));
+ } else if (!warned) {
+ fprintf(stderr,
+ ";; Warning: cannot represent '%s' "
+ "in the current locale",
+ local_src);
+ warned = true;
+ }
+ }
+
+ /*
+ * Free the interim conversion result.
+ */
+ idn2_free(utf8_src);
+
+ *dst = local_src;
+
+ resetlocale(LC_ALL);
+}
+#endif /* HAVE_LIBIDN2 */