/* $NetBSD: nslookup.c,v 1.4.4.1 2024/02/29 12:28:12 martin Exp $ */ /* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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); }