diff options
Diffstat (limited to 'bin/dig/nslookup.c')
| -rw-r--r-- | bin/dig/nslookup.c | 977 |
1 files changed, 977 insertions, 0 deletions
diff --git a/bin/dig/nslookup.c b/bin/dig/nslookup.c new file mode 100644 index 0000000..a0f508d --- /dev/null +++ b/bin/dig/nslookup.c @@ -0,0 +1,977 @@ +/* + * 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. + */ + +#include <inttypes.h> +#include <stdbool.h> +#include <stdlib.h> +#include <unistd.h> + +#include <isc/app.h> +#include <isc/attributes.h> +#include <isc/buffer.h> +#include <isc/commandline.h> +#include <isc/event.h> +#include <isc/netaddr.h> +#include <isc/parseint.h> +#include <isc/print.h> +#include <isc/string.h> +#include <isc/task.h> +#include <isc/util.h> + +#include <dns/byaddr.h> +#include <dns/fixedname.h> +#include <dns/message.h> +#include <dns/name.h> +#include <dns/rdata.h> +#include <dns/rdataclass.h> +#include <dns/rdataset.h> +#include <dns/rdatastruct.h> +#include <dns/rdatatype.h> + +#include "dighost.h" +#include "readline.h" + +static bool short_form = true, tcpmode = false, tcpmode_set = false, + identify = false, stats = true, comments = true, + section_question = true, section_answer = true, + section_authority = true, section_additional = true, recurse = true, + aaonly = false, nofail = true, default_lookups = true, + a_noanswer = false; + +static bool interactive; + +static bool in_use = false; +static char defclass[MXRD] = "IN"; +static char deftype[MXRD] = "A"; +static isc_event_t *global_event = NULL; +static int query_error = 1, print_error = 0; + +static char domainopt[DNS_NAME_MAXTEXT]; + +static const char *rcodetext[] = { "NOERROR", "FORMERR", "SERVFAIL", + "NXDOMAIN", "NOTIMP", "REFUSED", + "YXDOMAIN", "YXRRSET", "NXRRSET", + "NOTAUTH", "NOTZONE", "RESERVED11", + "RESERVED12", "RESERVED13", "RESERVED14", + "RESERVED15", "BADVERS" }; + +static const char *rtypetext[] = { + "rtype_0 = ", /* 0 */ + "internet address = ", /* 1 */ + "nameserver = ", /* 2 */ + "md = ", /* 3 */ + "mf = ", /* 4 */ + "canonical name = ", /* 5 */ + "soa = ", /* 6 */ + "mb = ", /* 7 */ + "mg = ", /* 8 */ + "mr = ", /* 9 */ + "rtype_10 = ", /* 10 */ + "protocol = ", /* 11 */ + "name = ", /* 12 */ + "hinfo = ", /* 13 */ + "minfo = ", /* 14 */ + "mail exchanger = ", /* 15 */ + "text = ", /* 16 */ + "rp = ", /* 17 */ + "afsdb = ", /* 18 */ + "x25 address = ", /* 19 */ + "isdn address = ", /* 20 */ + "rt = ", /* 21 */ + "nsap = ", /* 22 */ + "nsap_ptr = ", /* 23 */ + "signature = ", /* 24 */ + "key = ", /* 25 */ + "px = ", /* 26 */ + "gpos = ", /* 27 */ + "has AAAA address ", /* 28 */ + "loc = ", /* 29 */ + "next = ", /* 30 */ + "rtype_31 = ", /* 31 */ + "rtype_32 = ", /* 32 */ + "service = ", /* 33 */ + "rtype_34 = ", /* 34 */ + "naptr = ", /* 35 */ + "kx = ", /* 36 */ + "cert = ", /* 37 */ + "v6 address = ", /* 38 */ + "dname = ", /* 39 */ + "rtype_40 = ", /* 40 */ + "optional = " /* 41 */ +}; + +#define N_KNOWN_RRTYPES (sizeof(rtypetext) / sizeof(rtypetext[0])) + +static void +getinput(isc_task_t *task, isc_event_t *event); + +static char * +rcode_totext(dns_rcode_t rcode) { + static char buf[sizeof("?65535")]; + union { + const char *consttext; + char *deconsttext; + } totext; + + if (rcode >= (sizeof(rcodetext) / sizeof(rcodetext[0]))) { + snprintf(buf, sizeof(buf), "?%u", rcode); + totext.deconsttext = buf; + } else { + totext.consttext = rcodetext[rcode]; + } + return (totext.deconsttext); +} + +static void +query_finished(void) { + isc_event_t *event = global_event; + + debug("dighost_shutdown()"); + + if (!in_use) { + isc_app_shutdown(); + return; + } + + isc_task_send(global_task, &event); +} + +static void +printsoa(dns_rdata_t *rdata) { + dns_rdata_soa_t soa; + isc_result_t result; + char namebuf[DNS_NAME_FORMATSIZE]; + + result = dns_rdata_tostruct(rdata, &soa, NULL); + check_result(result, "dns_rdata_tostruct"); + + dns_name_format(&soa.origin, namebuf, sizeof(namebuf)); + printf("\torigin = %s\n", namebuf); + dns_name_format(&soa.contact, namebuf, sizeof(namebuf)); + printf("\tmail addr = %s\n", namebuf); + printf("\tserial = %u\n", soa.serial); + printf("\trefresh = %u\n", soa.refresh); + printf("\tretry = %u\n", soa.retry); + printf("\texpire = %u\n", soa.expire); + printf("\tminimum = %u\n", soa.minimum); + dns_rdata_freestruct(&soa); +} + +static void +printaddr(dns_rdata_t *rdata) { + isc_result_t result; + char text[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")]; + isc_buffer_t b; + + isc_buffer_init(&b, text, sizeof(text)); + result = dns_rdata_totext(rdata, NULL, &b); + check_result(result, "dns_rdata_totext"); + printf("Address: %.*s\n", (int)isc_buffer_usedlength(&b), + (char *)isc_buffer_base(&b)); +} + +static void +printrdata(dns_rdata_t *rdata) { + isc_result_t result; + isc_buffer_t *b = NULL; + unsigned int size = 1024; + bool done = false; + + if (rdata->type < N_KNOWN_RRTYPES) { + printf("%s", rtypetext[rdata->type]); + } else { + printf("rdata_%d = ", rdata->type); + } + + while (!done) { + isc_buffer_allocate(mctx, &b, size); + result = dns_rdata_totext(rdata, NULL, b); + if (result == ISC_R_SUCCESS) { + printf("%.*s\n", (int)isc_buffer_usedlength(b), + (char *)isc_buffer_base(b)); + done = true; + } else if (result != ISC_R_NOSPACE) { + check_result(result, "dns_rdata_totext"); + } + isc_buffer_free(&b); + size *= 2; + } +} + +static isc_result_t +printsection(dig_query_t *query, dns_message_t *msg, bool headers, + dns_section_t section) { + isc_result_t result, loopresult; + dns_name_t *name; + dns_rdataset_t *rdataset = NULL; + dns_rdata_t rdata = DNS_RDATA_INIT; + char namebuf[DNS_NAME_FORMATSIZE]; + + UNUSED(query); + UNUSED(headers); + + debug("printsection()"); + + result = dns_message_firstname(msg, section); + if (result == ISC_R_NOMORE) { + return (ISC_R_SUCCESS); + } else if (result != ISC_R_SUCCESS) { + return (result); + } + for (;;) { + name = NULL; + dns_message_currentname(msg, section, &name); + for (rdataset = ISC_LIST_HEAD(name->list); rdataset != NULL; + rdataset = ISC_LIST_NEXT(rdataset, link)) + { + loopresult = dns_rdataset_first(rdataset); + while (loopresult == ISC_R_SUCCESS) { + dns_rdataset_current(rdataset, &rdata); + switch (rdata.type) { + case dns_rdatatype_a: + case dns_rdatatype_aaaa: + if (section != DNS_SECTION_ANSWER) { + goto def_short_section; + } + dns_name_format(name, namebuf, + sizeof(namebuf)); + printf("Name:\t%s\n", namebuf); + printaddr(&rdata); + break; + case dns_rdatatype_soa: + dns_name_format(name, namebuf, + sizeof(namebuf)); + printf("%s\n", namebuf); + printsoa(&rdata); + break; + default: + def_short_section: + dns_name_format(name, namebuf, + sizeof(namebuf)); + printf("%s\t", namebuf); + printrdata(&rdata); + break; + } + dns_rdata_reset(&rdata); + loopresult = dns_rdataset_next(rdataset); + } + } + result = dns_message_nextname(msg, section); + if (result == ISC_R_NOMORE) { + break; + } else if (result != ISC_R_SUCCESS) { + return (result); + } + } + return (ISC_R_SUCCESS); +} + +static isc_result_t +detailsection(dig_query_t *query, dns_message_t *msg, bool headers, + dns_section_t section) { + isc_result_t result, loopresult; + dns_name_t *name; + dns_rdataset_t *rdataset = NULL; + dns_rdata_t rdata = DNS_RDATA_INIT; + char namebuf[DNS_NAME_FORMATSIZE]; + + UNUSED(query); + + debug("detailsection()"); + + if (headers) { + switch (section) { + case DNS_SECTION_QUESTION: + puts(" QUESTIONS:"); + break; + case DNS_SECTION_ANSWER: + puts(" ANSWERS:"); + break; + case DNS_SECTION_AUTHORITY: + puts(" AUTHORITY RECORDS:"); + break; + case DNS_SECTION_ADDITIONAL: + puts(" ADDITIONAL RECORDS:"); + break; + } + } + + result = dns_message_firstname(msg, section); + if (result == ISC_R_NOMORE) { + return (ISC_R_SUCCESS); + } else if (result != ISC_R_SUCCESS) { + return (result); + } + for (;;) { + name = NULL; + dns_message_currentname(msg, section, &name); + for (rdataset = ISC_LIST_HEAD(name->list); rdataset != NULL; + rdataset = ISC_LIST_NEXT(rdataset, link)) + { + if (section == DNS_SECTION_QUESTION) { + dns_name_format(name, namebuf, sizeof(namebuf)); + printf("\t%s, ", namebuf); + dns_rdatatype_format(rdataset->type, namebuf, + sizeof(namebuf)); + printf("type = %s, ", namebuf); + dns_rdataclass_format(rdataset->rdclass, + namebuf, sizeof(namebuf)); + printf("class = %s\n", namebuf); + } + loopresult = dns_rdataset_first(rdataset); + while (loopresult == ISC_R_SUCCESS) { + dns_rdataset_current(rdataset, &rdata); + + dns_name_format(name, namebuf, sizeof(namebuf)); + printf(" -> %s\n", namebuf); + + switch (rdata.type) { + case dns_rdatatype_soa: + printsoa(&rdata); + break; + default: + printf("\t"); + printrdata(&rdata); + } + dns_rdata_reset(&rdata); + printf("\tttl = %u\n", rdataset->ttl); + loopresult = dns_rdataset_next(rdataset); + } + } + result = dns_message_nextname(msg, section); + if (result == ISC_R_NOMORE) { + break; + } else if (result != ISC_R_SUCCESS) { + return (result); + } + } + return (ISC_R_SUCCESS); +} + +static void +received(unsigned int bytes, isc_sockaddr_t *from, dig_query_t *query) { + UNUSED(bytes); + UNUSED(from); + UNUSED(query); +} + +static void +trying(char *frm, dig_lookup_t *lookup) { + UNUSED(frm); + UNUSED(lookup); +} + +static void +chase_cnamechain(dns_message_t *msg, dns_name_t *qname) { + isc_result_t result; + dns_rdataset_t *rdataset; + dns_rdata_cname_t cname; + dns_rdata_t rdata = DNS_RDATA_INIT; + unsigned int i = msg->counts[DNS_SECTION_ANSWER]; + + while (i-- > 0) { + rdataset = NULL; + result = dns_message_findname(msg, DNS_SECTION_ANSWER, qname, + dns_rdatatype_cname, 0, NULL, + &rdataset); + if (result != ISC_R_SUCCESS) { + return; + } + result = dns_rdataset_first(rdataset); + check_result(result, "dns_rdataset_first"); + dns_rdata_reset(&rdata); + dns_rdataset_current(rdataset, &rdata); + result = dns_rdata_tostruct(&rdata, &cname, NULL); + check_result(result, "dns_rdata_tostruct"); + dns_name_copy(&cname.cname, qname); + dns_rdata_freestruct(&cname); + } +} + +static isc_result_t +printmessage(dig_query_t *query, const isc_buffer_t *msgbuf, dns_message_t *msg, + bool headers) { + char servtext[ISC_SOCKADDR_FORMATSIZE]; + + UNUSED(msgbuf); + + /* I've we've gotten this far, we've reached a server. */ + query_error = 0; + + debug("printmessage()"); + + if (!default_lookups || query->lookup->rdtype == dns_rdatatype_a) { + isc_sockaddr_format(&query->sockaddr, servtext, + sizeof(servtext)); + printf("Server:\t\t%s\n", query->userarg); + printf("Address:\t%s\n", servtext); + + puts(""); + } + + if (!short_form) { + puts("------------"); + /* detailheader(query, msg);*/ + detailsection(query, msg, true, DNS_SECTION_QUESTION); + detailsection(query, msg, true, DNS_SECTION_ANSWER); + detailsection(query, msg, true, DNS_SECTION_AUTHORITY); + detailsection(query, msg, true, DNS_SECTION_ADDITIONAL); + puts("------------"); + } + + if (msg->rcode != 0) { + char nametext[DNS_NAME_FORMATSIZE]; + dns_name_format(query->lookup->name, nametext, + sizeof(nametext)); + printf("** server can't find %s: %s\n", nametext, + rcode_totext(msg->rcode)); + debug("returning with rcode == 0"); + + /* the lookup failed */ + print_error |= 1; + return (ISC_R_SUCCESS); + } + + if (default_lookups && query->lookup->rdtype == dns_rdatatype_a) { + char namestr[DNS_NAME_FORMATSIZE]; + dig_lookup_t *lookup; + dns_fixedname_t fixed; + dns_name_t *name; + + /* Add AAAA lookup. */ + name = dns_fixedname_initname(&fixed); + dns_name_copy(query->lookup->name, name); + chase_cnamechain(msg, name); + dns_name_format(name, namestr, sizeof(namestr)); + lookup = clone_lookup(query->lookup, false); + if (lookup != NULL) { + strlcpy(lookup->textname, namestr, + sizeof(lookup->textname)); + lookup->rdtype = dns_rdatatype_aaaa; + lookup->rdtypeset = true; + lookup->origin = NULL; + lookup->retries = tries; + ISC_LIST_APPEND(lookup_list, lookup, link); + } + } + + if ((msg->flags & DNS_MESSAGEFLAG_AA) == 0 && + (!default_lookups || query->lookup->rdtype == dns_rdatatype_a)) + { + puts("Non-authoritative answer:"); + } + if (!ISC_LIST_EMPTY(msg->sections[DNS_SECTION_ANSWER])) { + printsection(query, msg, headers, DNS_SECTION_ANSWER); + } else { + if (default_lookups && query->lookup->rdtype == dns_rdatatype_a) + { + a_noanswer = true; + } else if (!default_lookups || + (query->lookup->rdtype == dns_rdatatype_aaaa && + a_noanswer)) + { + printf("*** Can't find %s: No answer\n", + query->lookup->textname); + } + } + + if (((msg->flags & DNS_MESSAGEFLAG_AA) == 0) && + (query->lookup->rdtype != dns_rdatatype_a) && + (query->lookup->rdtype != dns_rdatatype_aaaa)) + { + puts("\nAuthoritative answers can be found from:"); + printsection(query, msg, headers, DNS_SECTION_AUTHORITY); + printsection(query, msg, headers, DNS_SECTION_ADDITIONAL); + } + return (ISC_R_SUCCESS); +} + +static void +show_settings(bool full, bool serv_only) { + dig_server_t *srv; + isc_sockaddr_t sockaddr; + dig_searchlist_t *listent; + isc_result_t result; + + srv = ISC_LIST_HEAD(server_list); + + while (srv != NULL) { + char sockstr[ISC_SOCKADDR_FORMATSIZE]; + + result = get_address(srv->servername, port, &sockaddr); + check_result(result, "get_address"); + + isc_sockaddr_format(&sockaddr, sockstr, sizeof(sockstr)); + printf("Default server: %s\nAddress: %s\n", srv->userarg, + sockstr); + if (!full) { + return; + } + srv = ISC_LIST_NEXT(srv, link); + } + if (serv_only) { + return; + } + printf("\nSet options:\n"); + printf(" %s\t\t\t%s\t\t%s\n", tcpmode ? "vc" : "novc", + short_form ? "nodebug" : "debug", debugging ? "d2" : "nod2"); + printf(" %s\t\t%s\n", usesearch ? "search" : "nosearch", + recurse ? "recurse" : "norecurse"); + printf(" timeout = %u\t\tretry = %d\tport = %u\tndots = %d\n", timeout, + tries, port, ndots); + printf(" querytype = %-8s\tclass = %s\n", deftype, defclass); + printf(" srchlist = "); + for (listent = ISC_LIST_HEAD(search_list); listent != NULL; + listent = ISC_LIST_NEXT(listent, link)) + { + printf("%s", listent->origin); + if (ISC_LIST_NEXT(listent, link) != NULL) { + printf("/"); + } + } + printf("\n"); +} + +static bool +testtype(char *typetext) { + isc_result_t result; + isc_textregion_t tr; + dns_rdatatype_t rdtype; + + tr.base = typetext; + tr.length = strlen(typetext); + result = dns_rdatatype_fromtext(&rdtype, &tr); + if (result == ISC_R_SUCCESS) { + return (true); + } else { + printf("unknown query type: %s\n", typetext); + return (false); + } +} + +static bool +testclass(char *typetext) { + isc_result_t result; + isc_textregion_t tr; + dns_rdataclass_t rdclass; + + tr.base = typetext; + tr.length = strlen(typetext); + result = dns_rdataclass_fromtext(&rdclass, &tr); + if (result == ISC_R_SUCCESS) { + return (true); + } else { + printf("unknown query class: %s\n", typetext); + return (false); + } +} + +static void +set_port(const char *value) { + uint32_t n; + isc_result_t result = parse_uint(&n, value, 65535, "port"); + if (result == ISC_R_SUCCESS) { + port = (uint16_t)n; + port_set = true; + } +} + +static void +set_timeout(const char *value) { + uint32_t n; + isc_result_t result = parse_uint(&n, value, UINT_MAX, "timeout"); + if (result == ISC_R_SUCCESS) { + timeout = n; + } +} + +static void +set_tries(const char *value) { + uint32_t n; + isc_result_t result = parse_uint(&n, value, INT_MAX, "tries"); + if (result == ISC_R_SUCCESS) { + tries = n; + } +} + +static void +set_ndots(const char *value) { + uint32_t n; + isc_result_t result = parse_uint(&n, value, 128, "ndots"); + if (result == ISC_R_SUCCESS) { + ndots = n; + } +} + +static void +version(void) { + fprintf(stderr, "nslookup %s\n", PACKAGE_VERSION); +} + +static void +setoption(char *opt) { + size_t l = strlen(opt); + +#define CHECKOPT(A, N) \ + ((l >= N) && (l < sizeof(A)) && (strncasecmp(opt, A, l) == 0)) + + if (CHECKOPT("all", 3)) { + show_settings(true, false); + } else if (strncasecmp(opt, "class=", 6) == 0) { + if (testclass(&opt[6])) { + strlcpy(defclass, &opt[6], sizeof(defclass)); + } + } else if (strncasecmp(opt, "cl=", 3) == 0) { + if (testclass(&opt[3])) { + strlcpy(defclass, &opt[3], sizeof(defclass)); + } + } else if (strncasecmp(opt, "type=", 5) == 0) { + if (testtype(&opt[5])) { + strlcpy(deftype, &opt[5], sizeof(deftype)); + default_lookups = false; + } + } else if (strncasecmp(opt, "ty=", 3) == 0) { + if (testtype(&opt[3])) { + strlcpy(deftype, &opt[3], sizeof(deftype)); + default_lookups = false; + } + } else if (strncasecmp(opt, "querytype=", 10) == 0) { + if (testtype(&opt[10])) { + strlcpy(deftype, &opt[10], sizeof(deftype)); + default_lookups = false; + } + } else if (strncasecmp(opt, "query=", 6) == 0) { + if (testtype(&opt[6])) { + strlcpy(deftype, &opt[6], sizeof(deftype)); + default_lookups = false; + } + } else if (strncasecmp(opt, "qu=", 3) == 0) { + if (testtype(&opt[3])) { + strlcpy(deftype, &opt[3], sizeof(deftype)); + default_lookups = false; + } + } else if (strncasecmp(opt, "q=", 2) == 0) { + if (testtype(&opt[2])) { + strlcpy(deftype, &opt[2], sizeof(deftype)); + default_lookups = false; + } + } else if (strncasecmp(opt, "domain=", 7) == 0) { + strlcpy(domainopt, &opt[7], sizeof(domainopt)); + set_search_domain(domainopt); + usesearch = true; + } else if (strncasecmp(opt, "do=", 3) == 0) { + strlcpy(domainopt, &opt[3], sizeof(domainopt)); + set_search_domain(domainopt); + usesearch = true; + } else if (strncasecmp(opt, "port=", 5) == 0) { + set_port(&opt[5]); + } else if (strncasecmp(opt, "po=", 3) == 0) { + set_port(&opt[3]); + } else if (strncasecmp(opt, "timeout=", 8) == 0) { + set_timeout(&opt[8]); + } else if (strncasecmp(opt, "t=", 2) == 0) { + set_timeout(&opt[2]); + } else if (CHECKOPT("recurse", 3)) { + recurse = true; + } else if (CHECKOPT("norecurse", 5)) { + recurse = false; + } else if (strncasecmp(opt, "retry=", 6) == 0) { + set_tries(&opt[6]); + } else if (strncasecmp(opt, "ret=", 4) == 0) { + set_tries(&opt[4]); + } else if (CHECKOPT("defname", 3)) { + usesearch = true; + } else if (CHECKOPT("nodefname", 5)) { + usesearch = false; + } else if (CHECKOPT("vc", 2)) { + tcpmode = true; + tcpmode_set = true; + } else if (CHECKOPT("novc", 4)) { + tcpmode = false; + tcpmode_set = true; + } else if (CHECKOPT("debug", 3)) { + short_form = false; + showsearch = true; + } else if (CHECKOPT("nodebug", 5)) { + short_form = true; + showsearch = false; + } else if (CHECKOPT("d2", 2)) { + debugging = true; + } else if (CHECKOPT("nod2", 4)) { + debugging = false; + } else if (CHECKOPT("search", 3)) { + usesearch = true; + } else if (CHECKOPT("nosearch", 5)) { + usesearch = false; + } else if (CHECKOPT("sil", 3)) { + /* deprecation_msg = false; */ + } else if (CHECKOPT("fail", 3)) { + nofail = false; + } else if (CHECKOPT("nofail", 5)) { + nofail = true; + } else if (strncasecmp(opt, "ndots=", 6) == 0) { + set_ndots(&opt[6]); + } else { + printf("*** Invalid option: %s\n", opt); + } +} + +static void +addlookup(char *opt) { + dig_lookup_t *lookup; + isc_result_t result; + isc_textregion_t tr; + dns_rdatatype_t rdtype; + dns_rdataclass_t rdclass; + char store[MXNAME]; + + debug("addlookup()"); + + a_noanswer = false; + + tr.base = deftype; + tr.length = strlen(deftype); + result = dns_rdatatype_fromtext(&rdtype, &tr); + if (result != ISC_R_SUCCESS) { + printf("unknown query type: %s\n", deftype); + rdclass = dns_rdatatype_a; + } + tr.base = defclass; + tr.length = strlen(defclass); + result = dns_rdataclass_fromtext(&rdclass, &tr); + if (result != ISC_R_SUCCESS) { + printf("unknown query class: %s\n", defclass); + rdclass = dns_rdataclass_in; + } + lookup = make_empty_lookup(); + if (get_reverse(store, sizeof(store), opt, true) == ISC_R_SUCCESS) { + strlcpy(lookup->textname, store, sizeof(lookup->textname)); + lookup->rdtype = dns_rdatatype_ptr; + lookup->rdtypeset = true; + } else { + strlcpy(lookup->textname, opt, sizeof(lookup->textname)); + lookup->rdtype = rdtype; + lookup->rdtypeset = true; + } + lookup->rdclass = rdclass; + lookup->rdclassset = true; + lookup->trace = false; + lookup->trace_root = lookup->trace; + lookup->ns_search_only = false; + lookup->identify = identify; + lookup->recurse = recurse; + lookup->aaonly = aaonly; + lookup->retries = tries; + lookup->setqid = false; + lookup->qid = 0; + lookup->comments = comments; + if (lookup->rdtype == dns_rdatatype_any && !tcpmode_set) { + lookup->tcp_mode = true; + } else { + lookup->tcp_mode = tcpmode; + } + lookup->stats = stats; + lookup->section_question = section_question; + lookup->section_answer = section_answer; + lookup->section_authority = section_authority; + lookup->section_additional = section_additional; + lookup->new_search = true; + lookup->besteffort = false; + if (nofail) { + lookup->servfail_stops = false; + } + ISC_LIST_INIT(lookup->q); + ISC_LINK_INIT(lookup, link); + ISC_LIST_APPEND(lookup_list, lookup, link); + lookup->origin = NULL; + ISC_LIST_INIT(lookup->my_server_list); + debug("looking up %s", lookup->textname); +} + +static void +do_next_command(char *input) { + char *ptr, *arg, *last; + + if ((ptr = strtok_r(input, " \t\r\n", &last)) == NULL) { + return; + } + arg = strtok_r(NULL, " \t\r\n", &last); + if ((strcasecmp(ptr, "set") == 0) && (arg != NULL)) { + setoption(arg); + } else if ((strcasecmp(ptr, "server") == 0) || + (strcasecmp(ptr, "lserver") == 0)) + { + isc_app_block(); + set_nameserver(arg); + check_ra = false; + isc_app_unblock(); + show_settings(true, true); + } else if (strcasecmp(ptr, "exit") == 0) { + in_use = false; + } else if (strcasecmp(ptr, "help") == 0 || strcasecmp(ptr, "?") == 0) { + printf("The '%s' command is not yet implemented.\n", ptr); + } else if (strcasecmp(ptr, "finger") == 0 || + strcasecmp(ptr, "root") == 0 || strcasecmp(ptr, "ls") == 0 || + strcasecmp(ptr, "view") == 0) + { + printf("The '%s' command is not implemented.\n", ptr); + } else { + addlookup(ptr); + } +} + +static void +get_next_command(void) { + char cmdlinebuf[COMMSIZE]; + char *cmdline, *ptr = NULL; + + isc_app_block(); + if (interactive) { + cmdline = ptr = readline("> "); + if (ptr != NULL && *ptr != 0) { + add_history(ptr); + } + } else { + cmdline = fgets(cmdlinebuf, COMMSIZE, stdin); + } + isc_app_unblock(); + if (cmdline == NULL) { + in_use = false; + } else { + do_next_command(cmdline); + } + if (ptr != NULL) { + free(ptr); + } +} + +noreturn static void +usage(void); + +static void +usage(void) { + fprintf(stderr, "Usage:\n"); + fprintf(stderr, " nslookup [-opt ...] # interactive mode " + "using default server\n"); + fprintf(stderr, " nslookup [-opt ...] - server # interactive mode " + "using 'server'\n"); + fprintf(stderr, " nslookup [-opt ...] host # just look up " + "'host' using default server\n"); + fprintf(stderr, " nslookup [-opt ...] host server # just look up " + "'host' using 'server'\n"); + exit(1); +} + +static void +parse_args(int argc, char **argv) { + bool have_lookup = false; + + usesearch = true; + for (argc--, argv++; argc > 0 && argv[0] != NULL; argc--, argv++) { + debug("main parsing %s", argv[0]); + if (argv[0][0] == '-') { + if (strncasecmp(argv[0], "-ver", 4) == 0) { + version(); + exit(0); + } else if (argv[0][1] != 0) { + setoption(&argv[0][1]); + } else { + have_lookup = true; + } + } else { + if (!have_lookup) { + have_lookup = true; + in_use = true; + addlookup(argv[0]); + } else { + if (argv[1] != NULL) { + usage(); + } + set_nameserver(argv[0]); + check_ra = false; + } + } + } +} + +static void +getinput(isc_task_t *task, isc_event_t *event) { + UNUSED(task); + if (global_event == NULL) { + global_event = event; + } + while (in_use) { + get_next_command(); + if (ISC_LIST_HEAD(lookup_list) != NULL) { + start_lookup(); + return; + } + } + isc_app_shutdown(); +} + +int +main(int argc, char **argv) { + isc_result_t result; + + interactive = isatty(0); + + ISC_LIST_INIT(lookup_list); + ISC_LIST_INIT(server_list); + ISC_LIST_INIT(search_list); + + check_ra = true; + + /* setup dighost callbacks */ + dighost_printmessage = printmessage; + dighost_received = received; + dighost_trying = trying; + dighost_shutdown = query_finished; + + result = isc_app_start(); + check_result(result, "isc_app_start"); + + setup_libs(); + progname = argv[0]; + + setup_system(false, false); + parse_args(argc, argv); + if (keyfile[0] != 0) { + setup_file_key(); + } else if (keysecret[0] != 0) { + setup_text_key(); + } + if (domainopt[0] != '\0') { + set_search_domain(domainopt); + } + if (in_use) { + result = isc_app_onrun(mctx, global_task, onrun_callback, NULL); + } else { + result = isc_app_onrun(mctx, global_task, getinput, NULL); + } + check_result(result, "isc_app_onrun"); + in_use = !in_use; + + (void)isc_app_run(); + + puts(""); + debug("done, and starting to shut down"); + if (global_event != NULL) { + isc_event_free(&global_event); + } + cancel_all(); + destroy_libs(); + isc_app_finish(); + + return (query_error | print_error); +} |