Re: [cllfst] code source de nslookup

Name

nslookup — query Internet name servers interactively

Synopsis

nslookup [-option] [name | -] [server]

DESCRIPTION

Nslookup is a program to query Internet domain name servers. Nslookup has two modes: interactive and non-interactive. Interactive mode allows the user to query name servers for information about various hosts and domains or to print a list of hosts in a domain. Non-interactive mode is used to print just the name and requested information for a host or domain.

ARGUMENTS

Interactive mode is entered in the following cases:

when no arguments are given (the default name server will be used)
when the first argument is a hyphen (-) and the second argument is the host name or Internet address of a name server.

Non-interactive mode is used when the name or Internet address of the host to be looked up is given as the first argument. The optional second argument specifies the host name or address of a name server.

Options can also be specified on the command line if they precede the arguments and are prefixed with a hyphen. For example, to change the default query type to host information, and the initial timeout to 10 seconds, type:

nslookup -query=hinfo  -timeout=10

INTERACTIVE COMMANDS

host [server]

Look up information for host using the current default server or using server, if specified. If host is an Internet address and the query type is A or PTR, the name of the host is returned. If host is a name and does not have a trailing period, the search list is used to qualify the name.

To look up a host not in the current domain, append a period to the name.

server domain

lserver domain

Change the default server to domain; lserver uses the initial server to look up information about domain, while server uses the current default server. If an authoritative answer can't be found, the names of servers that might have the answer are returned.

root

not implemented

finger

not implemented

ls

not implemented

view

not implemented

help

not implemented

?

not implemented

exit

Exits the program.

set keyword[=value]

This command is used to change state information that affects the lookups. Valid keywords are:

all

Prints the current values of the frequently used options to set. Information about the current default server and host is also printed.

class=value

Change the query class to one of:

IN: the Internet class
CH: the Chaos class
HS: the Hesiod class
ANY: wildcard

The class specifies the protocol group of the information.

(Default = IN; abbreviation = cl)

[no]debug

Turn on or off the display of the full response packet and any intermediate response packets when searching.

(Default = nodebug; abbreviation = [no]deb)

[no]d2

Turn debugging mode on or off. This displays more about what nslookup is doing.

(Default = nod2)

domain=name

Sets the search list to name.

[no]search

If the lookup request contains at least one period but doesn't end with a trailing period, append the domain names in the domain search list to the request until an answer is received.

(Default = search)

port=value

Change the default TCP/UDP name server port to value.

(Default = 53; abbreviation = po)

querytype=value

type=value

Change the type of the information query.

(Default = A; abbreviations = q, ty)

[no]recurse

Tell the name server to query other servers if it does not have the information.

(Default = recurse; abbreviation = [no]rec)

retry=number

Set the number of retries to number.

timeout=number

Change the initial timeout interval for waiting for a reply to number seconds.

[no]vc

Always use a virtual circuit when sending requests to the server.

(Default = novc)

[no]fail

Try the next nameserver if a nameserver responds with SERVFAIL or a referral (nofail) or terminate query (fail) on such a response.

(Default = nofail)

FILES

/etc/resolv.conf

Author

Andrew Cherenson

/* * Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC") * Copyright (C) 2000-2003 Internet Software Consortium. * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ /* $Id: nslookup.c,v 1.117 2007/06/18 23:47:17 tbox Exp $ */ #include <config.h> #include <stdlib.h> #include <isc/app.h> #include <isc/buffer.h> #include <isc/commandline.h> #include <isc/event.h> #include <isc/parseint.h> #include <isc/string.h> #include <isc/timer.h> #include <isc/util.h> #include <isc/task.h> #include <isc/netaddr.h> #include <dns/message.h> #include <dns/name.h> #include <dns/fixedname.h> #include <dns/rdata.h> #include <dns/rdataclass.h> #include <dns/rdataset.h> #include <dns/rdatastruct.h> #include <dns/rdatatype.h> #include <dns/byaddr.h> #include <dig/dig.h> static isc_boolean_t short_form = ISC_TRUE, tcpmode = ISC_FALSE, identify = ISC_FALSE, stats = ISC_TRUE, comments = ISC_TRUE, section_question = ISC_TRUE, section_answer = ISC_TRUE, section_authority = ISC_TRUE, section_additional = ISC_TRUE, recurse = ISC_TRUE, aaonly = ISC_FALSE, nofail = ISC_TRUE; static isc_boolean_t in_use = ISC_FALSE; static char defclass[MXRD] = "IN"; static char deftype[MXRD] = "A"; static isc_event_t *global_event = NULL; 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 flush_lookup_list(void); static void getinput(isc_task_t *task, isc_event_t *event); void dighost_shutdown(void) { isc_event_t *event = global_event; flush_lookup_list(); 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 printa(dns_rdata_t *rdata) { isc_result_t result; char text[sizeof("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)); } #ifdef DIG_SIGCHASE /* Just for compatibility : not use in host program */ isc_result_t printrdataset(dns_name_t *owner_name, dns_rdataset_t *rdataset, isc_buffer_t *target) { UNUSED(owner_name); UNUSED(rdataset); UNUSED(target); return(ISC_FALSE); } #endif static void printrdata(dns_rdata_t *rdata) { isc_result_t result; isc_buffer_t *b = NULL; unsigned int size = 1024; isc_boolean_t done = ISC_FALSE; if (rdata->type < N_KNOWN_RRTYPES) printf("%s", rtypetext[rdata->type]); else printf("rdata_%d = ", rdata->type); while (!done) { result = isc_buffer_allocate(mctx, &b, size); if (result != ISC_R_SUCCESS) check_result(result, "isc_buffer_allocate"); 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 = ISC_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, isc_boolean_t 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: if (section != DNS_SECTION_ANSWER) goto def_short_section; dns_name_format(name, namebuf, sizeof(namebuf)); printf("Name:\t%s\n", namebuf); printa(&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, isc_boolean_t 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); 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); } void received(int bytes, isc_sockaddr_t *from, dig_query_t *query) { UNUSED(bytes); UNUSED(from); UNUSED(query); } void trying(char *frm, dig_lookup_t *lookup) { UNUSED(frm); UNUSED(lookup); } isc_result_t printmessage(dig_query_t *query, dns_message_t *msg, isc_boolean_t headers) { char servtext[ISC_SOCKADDR_FORMATSIZE]; debug("printmessage()"); 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) { isc_boolean_t headers = ISC_TRUE; puts("------------"); /* detailheader(query, msg);*/ detailsection(query, msg, headers, DNS_SECTION_QUESTION); detailsection(query, msg, headers, DNS_SECTION_ANSWER); detailsection(query, msg, headers, DNS_SECTION_AUTHORITY); detailsection(query, msg, headers, 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", (msg->rcode != dns_rcode_nxdomain) ? nametext : query->lookup->textname, rcodetext[msg->rcode]); debug("returning with rcode == 0"); return (ISC_R_SUCCESS); } if ((msg->flags & DNS_MESSAGEFLAG_AA) == 0) puts("Non-authoritative answer:"); if (!ISC_LIST_EMPTY(msg->sections[DNS_SECTION_ANSWER])) printsection(query, msg, headers, DNS_SECTION_ANSWER); else printf("*** Can't find %s: No answer\n", query->lookup->textname); if (((msg->flags & DNS_MESSAGEFLAG_AA) == 0) && (query->lookup->rdtype != dns_rdatatype_a)) { 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(isc_boolean_t full, isc_boolean_t serv_only) { dig_server_t *srv; isc_sockaddr_t sockaddr; dig_searchlist_t *listent; srv = ISC_LIST_HEAD(server_list); while (srv != NULL) { char sockstr[ISC_SOCKADDR_FORMATSIZE]; get_address(srv->servername, port, &sockaddr); 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 = %d\t\tretry = %d\tport = %d\n", timeout, tries, port); 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 isc_boolean_t 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 (ISC_TRUE); else { printf("unknown query type: %s\n", typetext); return (ISC_FALSE); } } static isc_boolean_t 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 (ISC_TRUE); else { printf("unknown query class: %s\n", typetext); return (ISC_FALSE); } } static void safecpy(char *dest, char *src, int size) { strncpy(dest, src, size); dest[size-1] = 0; } static isc_result_t parse_uint(isc_uint32_t *uip, const char *value, isc_uint32_t max, const char *desc) { isc_uint32_t n; isc_result_t result = isc_parse_uint32(&n, value, 10); 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); } static void set_port(const char *value) { isc_uint32_t n; isc_result_t result = parse_uint(&n, value, 65535, "port"); if (result == ISC_R_SUCCESS) port = (isc_uint16_t) n; } static void set_timeout(const char *value) { isc_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) { isc_uint32_t n; isc_result_t result = parse_uint(&n, value, INT_MAX, "tries"); if (result == ISC_R_SUCCESS) tries = n; } static void setoption(char *opt) { if (strncasecmp(opt, "all", 4) == 0) { show_settings(ISC_TRUE, ISC_FALSE); } else if (strncasecmp(opt, "class=", 6) == 0) { if (testclass(&opt[6])) safecpy(defclass, &opt[6], sizeof(defclass)); } else if (strncasecmp(opt, "cl=", 3) == 0) { if (testclass(&opt[3])) safecpy(defclass, &opt[3], sizeof(defclass)); } else if (strncasecmp(opt, "type=", 5) == 0) { if (testtype(&opt[5])) safecpy(deftype, &opt[5], sizeof(deftype)); } else if (strncasecmp(opt, "ty=", 3) == 0) { if (testtype(&opt[3])) safecpy(deftype, &opt[3], sizeof(deftype)); } else if (strncasecmp(opt, "querytype=", 10) == 0) { if (testtype(&opt[10])) safecpy(deftype, &opt[10], sizeof(deftype)); } else if (strncasecmp(opt, "query=", 6) == 0) { if (testtype(&opt[6])) safecpy(deftype, &opt[6], sizeof(deftype)); } else if (strncasecmp(opt, "qu=", 3) == 0) { if (testtype(&opt[3])) safecpy(deftype, &opt[3], sizeof(deftype)); } else if (strncasecmp(opt, "q=", 2) == 0) { if (testtype(&opt[2])) safecpy(deftype, &opt[2], sizeof(deftype)); } else if (strncasecmp(opt, "domain=", 7) == 0) { safecpy(domainopt, &opt[7], sizeof(domainopt)); set_search_domain(domainopt); usesearch = ISC_TRUE; } else if (strncasecmp(opt, "do=", 3) == 0) { safecpy(domainopt, &opt[3], sizeof(domainopt)); set_search_domain(domainopt); usesearch = ISC_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 (strncasecmp(opt, "rec", 3) == 0) { recurse = ISC_TRUE; } else if (strncasecmp(opt, "norec", 5) == 0) { recurse = ISC_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 (strncasecmp(opt, "def", 3) == 0) { usesearch = ISC_TRUE; } else if (strncasecmp(opt, "nodef", 5) == 0) { usesearch = ISC_FALSE; } else if (strncasecmp(opt, "vc", 3) == 0) { tcpmode = ISC_TRUE; } else if (strncasecmp(opt, "novc", 5) == 0) { tcpmode = ISC_FALSE; } else if (strncasecmp(opt, "deb", 3) == 0) { short_form = ISC_FALSE; showsearch = ISC_TRUE; } else if (strncasecmp(opt, "nodeb", 5) == 0) { short_form = ISC_TRUE; showsearch = ISC_FALSE; } else if (strncasecmp(opt, "d2", 2) == 0) { debugging = ISC_TRUE; } else if (strncasecmp(opt, "nod2", 4) == 0) { debugging = ISC_FALSE; } else if (strncasecmp(opt, "search", 3) == 0) { usesearch = ISC_TRUE; } else if (strncasecmp(opt, "nosearch", 5) == 0) { usesearch = ISC_FALSE; } else if (strncasecmp(opt, "sil", 3) == 0) { /* deprecation_msg = ISC_FALSE; */ } else if (strncasecmp(opt, "fail", 3) == 0) { nofail=ISC_FALSE; } else if (strncasecmp(opt, "nofail", 3) == 0) { nofail=ISC_TRUE; } 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()"); 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, lookup->ip6_int, ISC_TRUE) == ISC_R_SUCCESS) { safecpy(lookup->textname, store, sizeof(lookup->textname)); lookup->rdtype = dns_rdatatype_ptr; lookup->rdtypeset = ISC_TRUE; } else { safecpy(lookup->textname, opt, sizeof(lookup->textname)); lookup->rdtype = rdtype; lookup->rdtypeset = ISC_TRUE; } lookup->rdclass = rdclass; lookup->rdclassset = ISC_TRUE; lookup->trace = ISC_FALSE; lookup->trace_root = lookup->trace; lookup->ns_search_only = ISC_FALSE; lookup->identify = identify; lookup->recurse = recurse; lookup->aaonly = aaonly; lookup->retries = tries; lookup->udpsize = 0; lookup->comments = comments; 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 = ISC_TRUE; if (nofail) lookup->servfail_stops = ISC_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 get_next_command(void) { char *buf; char *ptr, *arg; char *input; fflush(stdout); buf = isc_mem_allocate(mctx, COMMSIZE); if (buf == NULL) fatal("memory allocation failure"); fputs("> ", stderr); fflush(stderr); isc_app_block(); ptr = fgets(buf, COMMSIZE, stdin); isc_app_unblock(); if (ptr == NULL) { in_use = ISC_FALSE; goto cleanup; } input = buf; ptr = next_token(&input, " \t\r\n"); if (ptr == NULL) goto cleanup; arg = next_token(&input, " \t\r\n"); 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 = ISC_FALSE; isc_app_unblock(); show_settings(ISC_TRUE, ISC_TRUE); } else if (strcasecmp(ptr, "exit") == 0) { in_use = ISC_FALSE; goto cleanup; } else if (strcasecmp(ptr, "help") == 0 || strcasecmp(ptr, "?") == 0) { printf("The '%s' command is not yet implemented.\n", ptr); goto cleanup; } 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); goto cleanup; } else addlookup(ptr); cleanup: isc_mem_free(mctx, buf); } static void parse_args(int argc, char **argv) { isc_boolean_t have_lookup = ISC_FALSE; usesearch = ISC_TRUE; for (argc--, argv++; argc > 0; argc--, argv++) { debug("main parsing %s", argv[0]); if (argv[0][0] == '-') { if (argv[0][1] != 0) setoption(&argv[0][1]); else have_lookup = ISC_TRUE; } else { if (!have_lookup) { have_lookup = ISC_TRUE; in_use = ISC_TRUE; addlookup(argv[0]); } else { set_nameserver(argv[0]); check_ra = ISC_FALSE; } } } } static void flush_lookup_list(void) { dig_lookup_t *l, *lp; dig_query_t *q, *qp; dig_server_t *s, *sp; lookup_counter = 0; l = ISC_LIST_HEAD(lookup_list); while (l != NULL) { q = ISC_LIST_HEAD(l->q); while (q != NULL) { if (q->sock != NULL) { isc_socket_cancel(q->sock, NULL, ISC_SOCKCANCEL_ALL); isc_socket_detach(&q->sock); } if (ISC_LINK_LINKED(&q->recvbuf, link)) ISC_LIST_DEQUEUE(q->recvlist, &q->recvbuf, link); if (ISC_LINK_LINKED(&q->lengthbuf, link)) ISC_LIST_DEQUEUE(q->lengthlist, &q->lengthbuf, link); isc_buffer_invalidate(&q->recvbuf); isc_buffer_invalidate(&q->lengthbuf); qp = q; q = ISC_LIST_NEXT(q, link); ISC_LIST_DEQUEUE(l->q, qp, link); isc_mem_free(mctx, qp); } s = ISC_LIST_HEAD(l->my_server_list); while (s != NULL) { sp = s; s = ISC_LIST_NEXT(s, link); ISC_LIST_DEQUEUE(l->my_server_list, sp, link); isc_mem_free(mctx, sp); } if (l->sendmsg != NULL) dns_message_destroy(&l->sendmsg); if (l->timer != NULL) isc_timer_detach(&l->timer); lp = l; l = ISC_LIST_NEXT(l, link); ISC_LIST_DEQUEUE(lookup_list, lp, link); isc_mem_free(mctx, lp); } } 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; ISC_LIST_INIT(lookup_list); ISC_LIST_INIT(server_list); ISC_LIST_INIT(search_list); check_ra = ISC_TRUE; result = isc_app_start(); check_result(result, "isc_app_start"); setup_libs(); progname = argv[0]; parse_args(argc, argv); setup_system(); 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 = ISC_TF(!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 (0); }

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