bin/dig/dig.c

	dig.c revision 25a66b4e41e2b0a2af4840749bac80ae78c678bf
/*
 * Copyright (C) 2000  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM
 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
 * INTERNET SOFTWARE CONSORTIUM 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: dig.c,v 1.128 2000/11/20 13:02:14 marka Exp $ */

#include <config.h>
#include <stdlib.h>
#include <time.h>
#include <ctype.h>

#include <isc/app.h>
#include <isc/netaddr.h>
#include <isc/print.h>
#include <isc/string.h>
#include <isc/util.h>
#include <isc/task.h>

#include <dns/byaddr.h>
#include <dns/fixedname.h>
#include <dns/message.h>
#include <dns/name.h>
#include <dns/rdata.h>
#include <dns/rdataset.h>
#include <dns/rdatatype.h>
#include <dns/rdataclass.h>

#include <dig/dig.h>

extern ISC_LIST(dig_lookup_t) lookup_list;
extern dig_serverlist_t server_list;
extern ISC_LIST(dig_searchlist_t) search_list;

#define ADD_STRING(b, s) {              \
    if (strlen(s) >= isc_buffer_availablelength(b)) \
        return (ISC_R_NOSPACE);         \
    else                        \
        isc_buffer_putstr(b, s);        \
}


extern isc_boolean_t have_ipv6, specified_source,
    usesearch, qr;
extern in_port_t port;
extern unsigned int timeout;
extern isc_mem_t *mctx;
extern dns_messageid_t id;
extern char *rootspace[BUFSIZE];
extern isc_buffer_t rootbuf;
extern int sendcount;
extern int ndots;
extern int tries;
extern int lookup_counter;
extern char fixeddomain[MXNAME];
extern int exitcode;
extern isc_sockaddr_t bind_address;
extern char keynametext[MXNAME];
extern char keyfile[MXNAME];
extern char keysecret[MXNAME];
extern dns_tsigkey_t *key;
extern isc_boolean_t validated;
extern isc_taskmgr_t *taskmgr;
extern isc_task_t *global_task;
extern isc_boolean_t free_now;
dig_lookup_t *default_lookup = NULL;
extern isc_uint32_t rr_limit;

extern isc_boolean_t debugging, memdebugging;
char *batchname = NULL;
FILE *batchfp = NULL;
char *argv0;

isc_boolean_t short_form = ISC_FALSE, printcmd = ISC_TRUE,
    nibble = ISC_FALSE, plusquest = ISC_FALSE, pluscomm = ISC_FALSE;

isc_uint16_t bufsize = 0;
isc_boolean_t forcecomment = ISC_FALSE;

static const char *opcodetext[] = {
    "QUERY",
    "IQUERY",
    "STATUS",
    "RESERVED3",
    "NOTIFY",
    "UPDATE",
    "RESERVED6",
    "RESERVED7",
    "RESERVED8",
    "RESERVED9",
    "RESERVED10",
    "RESERVED11",
    "RESERVED12",
    "RESERVED13",
    "RESERVED14",
    "RESERVED15"
};

static const char *rcodetext[] = {
    "NOERROR",
    "FORMERR",
    "SERVFAIL",
    "NXDOMAIN",
    "NOTIMPL",
    "REFUSED",
    "YXDOMAIN",
    "YXRRSET",
    "NXRRSET",
    "NOTAUTH",
    "NOTZONE",
    "RESERVED11",
    "RESERVED12",
    "RESERVED13",
    "RESERVED14",
    "RESERVED15",
    "BADVERS"
};

extern char *progname;

static void
show_usage(void) {
    fputs(
"Usage:  dig [@global-server] [domain] [q-type] [q-class] {q-opt}\n"
"        {global-d-opt} host [@local-server] {local-d-opt}\n"
"        [ host [@local-server] {local-d-opt} [...]]\n"
"Where:  domain   are in the Domain Name System\n"
"        q-class  is one of (in,hs,ch,...) [default: in]\n"
"        q-type   is one of (a,any,mx,ns,soa,hinfo,axfr,txt,...) [default:a]\n"
"                 (Use ixfr=version for type ixfr)\n"
"        q-opt    is one of:\n"
"                 -x dot-notation     (shortcut for in-addr lookups)\n"
"                 -n                  (nibble form for reverse IPv6 lookups)\n"
"                 -f filename         (batch mode)\n"
"                 -p port             (specify port number)\n"
"                 -t type             (specify query type)\n"
"                 -c class            (specify query class)\n"
"                 -y name:key         (specify named base64 tsig key)\n"
"        d-opt    is of the form +keyword[=value], where keyword is:\n"
"                 +[no]vc             (TCP mode)\n"
"                 +[no]tcp            (TCP mode, alternate syntax)\n"
"                 +time=###           (Set query timeout) [5]\n"
"                 +tries=###          (Set number of UDP attempts) [3]\n"
"                 +domain=###         (Set default domainname)\n"
"                 +bufsize=###        (Set EDNS0 Max UDP packet size)\n"
"                 +[no]search         (Set whether to use searchlist)\n"
"                 +[no]defname        (Set whether to use default domain)\n"
"                 +[no]recursive      (Recursive mode)\n"
"                 +[no]ignore         (Don't revert to TCP for TC responses.)"
"\n"
"                 +[no]fail           (Don't try next server on SERVFAIL)\n"
"                 +[no]besteffort     (Try to parse even illegal messages)\n"
"                 +[no]aaonly         (Set AA flag in query)\n"
"                 +[no]adflag         (Set AD flag in query)\n"
"                 +[no]cdflag         (Set CD flag in query)\n"
"                 +ndots=###          (Set NDOTS value)\n"
"                 +[no]cmd            (Control display of command line)\n"
"                 +[no]comments       (Control display of comment lines)\n"
"                 +[no]question       (Control display of question)\n"
"                 +[no]answer         (Control display of answer)\n"
"                 +[no]authority      (Control display of authority)\n"
"                 +[no]additional     (Control display of additional)\n"
"                 +[no]short          (Disable everything except short\n"
"                                      form of answer)\n"
"                 +[no]all            (Set or clear all display flags)\n"
"                 +qr                 (Print question before sending)\n"
"                 +[no]nssearch       (Search all authorative nameservers)\n"
"                 +[no]identify       (ID responders in short answers)\n"
"                 +[no]trace          (Trace delegation down from root)\n"
"                 +rrlimit=###        (Limit number of rr's in xfr)\n"
"                 +namelimit=###      (Limit number of names in xfr)\n"
"                 +[no]dnssec         (Request DNSSEC records)\n"
"        global d-opts and servers (before host name) affect all queries.\n"
"        local d-opts and servers (after host name) affect only that lookup.\n"
, stderr);
}

/*
 * Callback from dighost.c to print the received message.
 */
void
received(int bytes, int frmsize, char *frm, dig_query_t *query) {
    isc_uint64_t diff;
    isc_time_t now;
    isc_result_t result;
    time_t tnow;

    result = isc_time_now(&now);
    check_result(result, "isc_time_now");

    if (query->lookup->stats) {
        diff = isc_time_microdiff(&now, &query->time_sent);
        printf(";; Query time: %ld msec\n", (long int)diff/1000);
        printf(";; SERVER: %.*s(%s)\n", frmsize, frm,
               query->servname);
        time(&tnow);
        printf(";; WHEN: %s", ctime(&tnow));
        if (query->lookup->doing_xfr) {
            printf(";; XFR size: %d records\n",
                   query->rr_count);
        } else {
            printf(";; MSG SIZE  rcvd: %d\n", bytes);

        }
        if (key != NULL) {
            if (!validated)
                puts(";; WARNING -- Some TSIG could not "
                     "be validated");
        }
        if ((key == NULL) && (keysecret[0] != 0)) {
            puts(";; WARNING -- TSIG key was not used.");
        }
        puts("");
    } else if (query->lookup->identify && !short_form) {
        diff = isc_time_microdiff(&now, &query->time_sent);
        printf(";; Received %u bytes from %.*s(%s) in %d ms\n\n",
               bytes, frmsize, frm, query->servname,
               (int)diff/1000);
    }
}

/*
 * Callback from dighost.c to print that it is trying a server.
 * Not used in dig.
 * XXX print_trying
 */
void
trying(int frmsize, char *frm, dig_lookup_t *lookup) {
    UNUSED(frmsize);
    UNUSED(frm);
    UNUSED(lookup);
}

/*
 * Internal print routine used to print short form replies.
 */
static isc_result_t
say_message(dns_rdata_t *rdata, dig_query_t *query, isc_buffer_t *buf) {
    isc_result_t result;
    isc_uint64_t diff;
    isc_time_t now;
    char store[sizeof("12345678901234567890")];

    if (query->lookup->trace || query->lookup->ns_search_only) {
        result = dns_rdatatype_totext(rdata->type, buf);
        if (result != ISC_R_SUCCESS)
            return (result);
        ADD_STRING(buf, " ");
    }
    result = dns_rdata_totext(rdata, NULL, buf);
    check_result(result, "dns_rdata_totext");
    if (query->lookup->identify) {
        result = isc_time_now(&now);
        if (result != ISC_R_SUCCESS)
            return (result);
        diff = isc_time_microdiff(&now, &query->time_sent);
        ADD_STRING(buf, " from server ");
        ADD_STRING(buf, query->servname);
        snprintf(store, 19, " in %d ms.", (int)diff/1000);
        ADD_STRING(buf, store);
    }
    ADD_STRING(buf, "\n");
    return (ISC_R_SUCCESS);
}

/*
 * short_form message print handler.  Calls above say_message()
 */
static isc_result_t
short_answer(dns_message_t *msg, dns_messagetextflag_t flags,
         isc_buffer_t *buf, dig_query_t *query)
{
    dns_name_t *name;
    dns_rdataset_t *rdataset;
    isc_buffer_t target;
    isc_result_t result, loopresult;
    dns_name_t empty_name;
    char t[4096];
    dns_rdata_t rdata = DNS_RDATA_INIT;

    UNUSED(flags);

    dns_name_init(&empty_name, NULL);
    result = dns_message_firstname(msg, DNS_SECTION_ANSWER);
    if (result == ISC_R_NOMORE)
        return (ISC_R_SUCCESS);
    else if (result != ISC_R_SUCCESS)
        return (result);

    for (;;) {
        name = NULL;
        dns_message_currentname(msg, DNS_SECTION_ANSWER, &name);

        isc_buffer_init(&target, t, sizeof(t));

        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);
                result = say_message(&rdata, query,
                             buf);
                check_result(result, "say_message");
                loopresult = dns_rdataset_next(rdataset);
                dns_rdata_reset(&rdata);
            }
        }
        result = dns_message_nextname(msg, DNS_SECTION_ANSWER);
        if (result == ISC_R_NOMORE)
            break;
        else if (result != ISC_R_SUCCESS)
            return (result);
    }

    return (ISC_R_SUCCESS);
}

/*
 * Callback from dighost.c to print the reply from a server
 */
isc_result_t
printmessage(dig_query_t *query, dns_message_t *msg, isc_boolean_t headers) {
    isc_boolean_t did_flag = ISC_FALSE;
    isc_result_t result;
    dns_messagetextflag_t flags;
    isc_buffer_t *buf = NULL;
    unsigned int len = OUTPUTBUF;

    if (query->lookup->cmdline[0] != 0) {
        fputs(query->lookup->cmdline, stdout);
        query->lookup->cmdline[0]=0;
    }
    debug("printmessage(%s %s %s)", headers ? "headers" : "noheaders",
          query->lookup->comments ? "comments" : "nocomments",
          short_form ? "short_form" : "long_form");

    flags = 0;
    if (!headers) {
        flags |= DNS_MESSAGETEXTFLAG_NOHEADERS;
        flags |= DNS_MESSAGETEXTFLAG_NOCOMMENTS;
    }
    if (!query->lookup->comments)
        flags |= DNS_MESSAGETEXTFLAG_NOCOMMENTS;

    result = ISC_R_SUCCESS;

    result = isc_buffer_allocate(mctx, &buf, len);
    check_result(result, "isc_buffer_allocate");

    if (query->lookup->comments && !short_form) {
        if (query->lookup->cmdline[0] != 0)
            printf("; %s\n", query->lookup->cmdline);
        if (msg == query->lookup->sendmsg)
            printf(";; Sending:\n");
        else
            printf(";; Got answer:\n");

        if (headers) {
            printf(";; ->>HEADER<<- opcode: %s, status: %s, "
                   "id: %u\n",
                   opcodetext[msg->opcode], rcodetext[msg->rcode],
                   msg->id);
            printf(";; flags: ");
            if ((msg->flags & DNS_MESSAGEFLAG_QR) != 0) {
                printf("qr");
                did_flag = ISC_TRUE;
            }
            if ((msg->flags & DNS_MESSAGEFLAG_AA) != 0) {
                printf("%saa", did_flag ? " " : "");
                did_flag = ISC_TRUE; }
            if ((msg->flags & DNS_MESSAGEFLAG_TC) != 0) {
                printf("%stc", did_flag ? " " : "");
                did_flag = ISC_TRUE;
            }
            if ((msg->flags & DNS_MESSAGEFLAG_RD) != 0) {
                printf("%srd", did_flag ? " " : "");
                did_flag = ISC_TRUE;
            }
            if ((msg->flags & DNS_MESSAGEFLAG_RA) != 0) {
                printf("%sra", did_flag ? " " : "");
                did_flag = ISC_TRUE;
            }
            if ((msg->flags & DNS_MESSAGEFLAG_AD) != 0) {
                printf("%sad", did_flag ? " " : "");
                did_flag = ISC_TRUE;
            }
            if ((msg->flags & DNS_MESSAGEFLAG_CD) != 0) {
                printf("%scd", did_flag ? " " : "");
                did_flag = ISC_TRUE;
            }

            printf("; QUERY: %u, ANSWER: %u, "
                   "AUTHORITY: %u, ADDITIONAL: %u\n",
                   msg->counts[DNS_SECTION_QUESTION],
                   msg->counts[DNS_SECTION_ANSWER],
                   msg->counts[DNS_SECTION_AUTHORITY],
                   msg->counts[DNS_SECTION_ADDITIONAL]);

            result = dns_message_pseudosectiontotext(msg,
                         DNS_PSEUDOSECTION_OPT,
                         flags, buf);
            check_result(result,
                     "dns_message_pseudosectiontotext");
        }
    }

    if (query->lookup->section_question && headers) {
        if (!short_form) {
        question_again:
            result = dns_message_sectiontotext(msg,
                               DNS_SECTION_QUESTION,
                               flags, buf);
            if (result == ISC_R_NOSPACE) {
                len += OUTPUTBUF;
                isc_buffer_free(&buf);
                result = isc_buffer_allocate(mctx, &buf, len);
                if (result == ISC_R_SUCCESS)
                    goto question_again;
            }
            check_result(result, "dns_message_sectiontotext");
        }
    }
    if (query->lookup->section_answer) {
        if (!short_form) {
        answer_again:
            result = dns_message_sectiontotext(msg,
                               DNS_SECTION_ANSWER,
                               flags, buf);
            if (result == ISC_R_NOSPACE) {
                len += OUTPUTBUF;
                isc_buffer_free(&buf);
                result = isc_buffer_allocate(mctx, &buf, len);
                if (result == ISC_R_SUCCESS)
                    goto answer_again;
            }
            check_result(result, "dns_message_sectiontotext");
        } else {
            result = short_answer(msg, flags, buf, query);
            check_result(result, "short_answer");
        }
    }
    if (query->lookup->section_authority) {
        if (!short_form) {
        authority_again:
            result = dns_message_sectiontotext(msg,
                               DNS_SECTION_AUTHORITY,
                               flags, buf);
            if (result == ISC_R_NOSPACE) {
                len += OUTPUTBUF;
                isc_buffer_free(&buf);
                result = isc_buffer_allocate(mctx, &buf, len);
                if (result == ISC_R_SUCCESS)
                    goto authority_again;
            }
            check_result(result, "dns_message_sectiontotext");
        }
    }
    if (query->lookup->section_additional) {
        if (!short_form) {
        additional_again:
            result = dns_message_sectiontotext(msg,
                              DNS_SECTION_ADDITIONAL,
                              flags, buf);
            if (result == ISC_R_NOSPACE) {
                len += OUTPUTBUF;
                isc_buffer_free(&buf);
                result = isc_buffer_allocate(mctx, &buf, len);
                if (result == ISC_R_SUCCESS)
                    goto additional_again;
            }
            check_result(result, "dns_message_sectiontotext");
            /*
             * Only print the signature on the first record.
             */
            if (headers) {
                result = dns_message_pseudosectiontotext(
                           msg,
                           DNS_PSEUDOSECTION_TSIG,
                           flags, buf);
                check_result(result,
                      "dns_message_pseudosectiontotext");
                result = dns_message_pseudosectiontotext(
                           msg,
                           DNS_PSEUDOSECTION_SIG0,
                           flags, buf);

                check_result(result,
                       "dns_message_pseudosectiontotext");
            }
        }
    }
    if (headers && query->lookup->comments && !short_form)
        printf("\n");

    printf("%.*s", (int)isc_buffer_usedlength(buf),
           (char *)isc_buffer_base(buf));
    isc_buffer_free(&buf);
    return (result);
}

/*
 * print the greeting message when the program first starts up.
 */
static void
printgreeting(int argc, char **argv, dig_lookup_t *lookup) {
    int i;
    static isc_boolean_t first = ISC_TRUE;
    char append[MXNAME];

    if (printcmd) {
        snprintf(lookup->cmdline, sizeof(lookup->cmdline),
             "%s; <<>> DiG " VERSION " <<>>",
             first?"\n":"");
        i = 1;
        while (i < argc) {
            snprintf(append, sizeof(append), " %s", argv[i++]);
            strncat(lookup->cmdline, append,
                sizeof (lookup->cmdline));
        }
        strncat(lookup->cmdline, "\n", sizeof (lookup->cmdline));
        if (first) {
            snprintf(append, sizeof (append),
                 ";; global options: %s %s\n",
                   short_form ? "short_form" : "",
                   printcmd ? "printcmd" : "");
            first = ISC_FALSE;
            strncat(lookup->cmdline, append,
                sizeof (lookup->cmdline));
        }
    }
}

/*
 * Reorder an argument list so that server names all come at the end.
 * This is a bit of a hack, to allow batch-mode processing to properly
 * handle the server options.
 */
static void
reorder_args(int argc, char *argv[]) {
    int i, j;
    char *ptr;
    int end;

    debug("reorder_args()");
    end = argc - 1;
    while (argv[end][0] == '@') {
        end--;
        if (end == 0)
            return;
    }
    debug("arg[end]=%s", argv[end]);
    for (i = 1; i < end - 1; i++) {
        if (argv[i][0] == '@') {
            debug("arg[%d]=%s", i, argv[i]);
            ptr = argv[i];
            for (j = i + 1; j < end; j++) {
                debug("Moving %s to %d", argv[j], j - 1);
                argv[j - 1] = argv[j];
            }
            debug("moving %s to end, %d", ptr, end - 1);
            argv[end - 1] = ptr;
            end--;
            if (end < 1)
                return;
        }
    }
}

/*
 * We're not using isc_commandline_parse() here since the command line
 * syntax of dig is quite a bit different from that which can be described
 * that routine.
 * XXX doc options
 */

static void
plus_option(char *option, isc_boolean_t is_batchfile,
        dig_lookup_t *lookup)
{
    char option_store[256];
    char *cmd, *value, *ptr;
    isc_boolean_t state = ISC_TRUE;

    strncpy(option_store, option, sizeof(option_store));
    option_store[sizeof(option_store)-1]=0;
    ptr = option_store;
    cmd=next_token(&ptr,"=");
    if (cmd == NULL) {
        printf(";; Invalid option %s\n",option_store);
        return;
    }
    value=ptr;
    if (strncasecmp(cmd,"no",2)==0) {
        cmd += 2;
        state = ISC_FALSE;
    }
    switch (cmd[0]) {
    case 'a':
        switch (cmd[1]) {
        case 'a': /* aaflag */
            lookup->aaonly = state;
            break;
        case 'd':
            switch (cmd[2]) {
            case 'd': /* additional */
                lookup->section_additional = state;
                break;
            case 'f': /* adflag */
                lookup->adflag = state;
                break;
            default:
                goto invalid_option;
            }
            break;
        case 'l': /* all */
            lookup->section_question = state;
            lookup->section_authority = state;
            lookup->section_answer = state;
            lookup->section_additional = state;
            lookup->comments = state;
            break;
        case 'n': /* answer */
            lookup->section_answer = state;
            break;
        case 'u': /* authority */
            lookup->section_authority = state;
            break;
        default:
            goto invalid_option;
        }
        break;
    case 'b':
        switch (cmd[1]) {
        case 'e':/* besteffort */
            lookup->besteffort = state;
            break;
        case 'u':/* bufsize */
            if (value == NULL)
                goto need_value;
            if (!state)
                goto invalid_option;
            lookup->udpsize = atoi(value);
            if (lookup->udpsize <= 0)
                lookup->udpsize = 0;
            if (lookup->udpsize > COMMSIZE)
                lookup->udpsize = COMMSIZE;
            break;
        default:
            goto invalid_option;
        }
        break;
    case 'c':
        switch (cmd[1]) {
        case 'd':/* cdflag */
            lookup->cdflag = state;
            break;
        case 'm': /* cmd */
            printcmd = state;
            break;
        case 'o': /* comments */
            lookup->comments = state;
            if (lookup == default_lookup)
                pluscomm = state;
            break;
        default:
            goto invalid_option;
        }
        break;
    case 'd':
        switch (cmd[1]) {
        case 'e': /* defname */
            lookup->defname = state;
            break;
        case 'n': /* dnssec */
            lookup->dnssec = state;
            break;
        case 'o': /* domain */
            if (value == NULL)
                goto need_value;
            if (!state)
                goto invalid_option;
            strncpy(fixeddomain, value, sizeof(fixeddomain));
            fixeddomain[sizeof(fixeddomain)-1]=0;
            break;
        default:
            goto invalid_option;
        }
        break;
    case 'f': /* fail */
        lookup->servfail_stops = state;
        break;
    case 'i':
        switch (cmd[1]) {
        case 'd': /* identify */
            lookup->identify = state;
            break;
        case 'g': /* ignore */
        default: /* Inherets default for compatibility */
            lookup->ignore = ISC_TRUE;
        }
        break;
    case 'n':
        switch (cmd[1]) {
        case 'd': /* ndots */
            if (value == NULL)
                goto need_value;
            if (!state)
                goto invalid_option;
            ndots = atoi(value);
            if (ndots < 0)
                ndots = 0;
            break;
        case 's': /* nssearch */
            lookup->ns_search_only = state;
            if (state) {
                lookup->trace_root = ISC_TRUE;
                lookup->recurse = ISC_FALSE;
                lookup->identify = ISC_TRUE;
                lookup->stats = ISC_FALSE;
                lookup->comments = ISC_FALSE;
                lookup->section_additional = ISC_FALSE;
                lookup->section_authority = ISC_FALSE;
                lookup->section_question = ISC_FALSE;
                lookup->rdtype = dns_rdatatype_soa;
                short_form = ISC_TRUE;
            }
            break;
        default:
            goto invalid_option;
        }
        break;
    case 'q':
        switch (cmd[1]) {
        case 'r': /* qr */
            qr = state;
            break;
        case 'u': /* question */
            lookup->section_question = state;
            if (lookup == default_lookup)
                plusquest = state;
            break;
        default:
            goto invalid_option;
        }
        break;
    case 'r':
        switch (cmd[1]) {
        case 'e': /* recurse */
            lookup->recurse = state;
            break;
        case 'r': /* rrlimit */
            if (value == NULL)
                goto need_value;
            if (!state)
                goto invalid_option;
            rr_limit = atoi(value);
            break;
        default:
            goto invalid_option;
        }
        break;
    case 's':
        switch (cmd[1]) {
        case 'e': /* search */
            usesearch = state;
            break;
        case 'h': /* short */
            short_form = state;
            if (state) {
                printcmd = ISC_FALSE;
                lookup->section_additional = ISC_FALSE;
                lookup->section_authority = ISC_FALSE;
                lookup->section_question = ISC_FALSE;
                lookup->comments = ISC_FALSE;
                lookup->stats = ISC_FALSE;
            }
            break;
        case 't': /* stats */
            lookup->stats = state;
            break;
        default:
            goto invalid_option;
        }
        break;
    case 't':
        switch (cmd[1]) {
        case 'c': /* tcp */
            if (!is_batchfile)
                lookup->tcp_mode = state;
            break;
        case 'i': /* timeout */
            if (value == NULL)
                goto need_value;
            if (!state)
                goto invalid_option;
            timeout = atoi(value);
            if (timeout <= 0)
                timeout = 1;
            break;
        case 'r':
            switch (cmd[2]) {
            case 'a': /* trace */
                lookup->trace = state;
                lookup->trace_root = state;
                if (state) {
                    lookup->recurse = ISC_FALSE;
                    lookup->identify = ISC_TRUE;
                    lookup->comments = ISC_FALSE;
                    lookup->stats = ISC_FALSE;
                    lookup->section_additional = ISC_FALSE;
                    lookup->section_authority = ISC_TRUE;
                    lookup->section_question = ISC_FALSE;
                }
                break;
            case 'i': /* tries */
                if (value == NULL)
                    goto need_value;
                if (!state)
                    goto invalid_option;
                lookup->retries = atoi(value);
                if (lookup->retries <= 0)
                    lookup->retries = 1;
                break;
            default:
                goto invalid_option;
            }
            break;
        default:
            goto invalid_option;
        }
        break;
    case 'v':
#ifdef DNS_OPT_NEWCODES_LIVE
        switch (cmd[1]) {
        default:
        case 'c': /* vc, and default */
#endif /* DNS_OPT_NEWCODES_LIVE */
            if (!is_batchfile)
                lookup->tcp_mode = state;
            break;
#ifdef DNS_OPT_NEWCODES_LIVE
        case 'i': /* view */
            if (value == NULL)
                goto need_value;
            if (!state)
                goto invalid_option;
            strncpy(lookup->viewname, value, MXNAME);
            break;
        }
        break;
    case 'z': /* zone */
        if (value == NULL)
            goto need_value;
        if (!state)
            goto invalid_option;
        strncpy(lookup->zonename, value, MXNAME);
        break;
#endif /* DNS_OPT_NEWCODES_LIVE */
    default:
    invalid_option:
    need_value:
        fprintf(stderr, "Invalid option: +%s\n",
             option);
        show_usage();
        exit(1);
    }
    return;
}

/*
 * ISC_TRUE returned if value was used
 */
static isc_boolean_t
dash_option(char *option, char *next, dig_lookup_t **lookup,
        isc_boolean_t *open_type_class)
{
    char cmd, *value, *ptr;
    isc_result_t result;
    isc_boolean_t value_from_next;
    isc_textregion_t tr;
    dns_rdatatype_t rdtype;
    dns_rdataclass_t rdclass;
    char textname[MXNAME];

    cmd = option[0];
    if (strlen(option) > 1) {
        value_from_next = ISC_FALSE;
        value = &option[1];
    }
    else {
        value_from_next = ISC_TRUE;
        value = next;
    }
    switch (cmd) {
    case 'd':
        debugging = ISC_TRUE;
        return (ISC_FALSE);
    case 'h':
        show_usage();
        exit(0);
        break;
    case 'm': /* memdebug */
        /* memdebug is handled in preparse_args() */
        return (ISC_FALSE);
    case 'n':
        nibble = ISC_TRUE;
        return (ISC_FALSE);
    }
    if (value == NULL)
        goto invalid_option;
    switch (cmd) {
    case 'b':
        get_address(value, 0, &bind_address);
        specified_source = ISC_TRUE;
        return (value_from_next);
    case 'c':
        *open_type_class = ISC_FALSE;
        tr.base = value;
        tr.length = strlen(value);
        result = dns_rdataclass_fromtext(&rdclass,
                         (isc_textregion_t *)&tr);
        if (result == ISC_R_SUCCESS)
            (*lookup)->rdclass = rdclass;
        else
            fprintf(stderr, ";; Warning, ignoring "
                "invalid class %s\n",
                value);
        return (value_from_next);
    case 'f':
        batchname = value;
        return (value_from_next);
    case 'k':
        strncpy(keyfile, value, sizeof(keyfile));
        keyfile[sizeof(keyfile)-1]=0;
        return (value_from_next);
    case 'p':
        port = atoi(value);
        return (value_from_next);
    case 't':
        *open_type_class = ISC_FALSE;
        if (strncasecmp(value, "ixfr=", 5) == 0) {
            (*lookup)->rdtype = dns_rdatatype_ixfr;
            (*lookup)->ixfr_serial =
                atoi(&value[5]);
            (*lookup)->section_question = plusquest;
            (*lookup)->comments = pluscomm;
            return (value_from_next);
        }
        tr.base = value;
        tr.length = strlen(value);
        result = dns_rdatatype_fromtext(&rdtype,
                        (isc_textregion_t *)&tr);
        if (result == ISC_R_SUCCESS) {
            (*lookup)->rdtype = rdtype;
            if (rdtype == dns_rdatatype_axfr) {
                (*lookup)->section_question = plusquest;
                (*lookup)->comments = pluscomm;
            }
        } else
            fprintf(stderr, ";; Warning, ignoring "
                 "invalid type %s\n",
                 value);
        return (value_from_next);
    case 'y':
        ptr = next_token(&value,":");
        if (ptr == NULL) {
            show_usage();
            exit(1);
        }
        strncpy(keynametext, ptr, sizeof(keynametext));
        keynametext[sizeof(keynametext)-1]=0;
        ptr = next_token(&value, "");
        if (ptr == NULL) {
            show_usage();
            exit(1);
        }
        strncpy(keysecret, ptr, sizeof(keysecret));
        keysecret[sizeof(keysecret)-1]=0;
        return (value_from_next);
    case 'x':
        *lookup = clone_lookup(default_lookup, ISC_TRUE);
        if (get_reverse(textname, value, nibble) == ISC_R_SUCCESS) {
            strncpy((*lookup)->textname, textname,
                sizeof((*lookup)->textname));
            debug("looking up %s", (*lookup)->textname);
            (*lookup)->trace_root = ISC_TF((*lookup)->trace  ||
                            (*lookup)->ns_search_only);
            (*lookup)->nibble = nibble;
            (*lookup)->rdtype = dns_rdatatype_ptr;
            (*lookup)->rdclass = dns_rdataclass_in;
            (*lookup)->new_search = ISC_TRUE;
            ISC_LIST_APPEND(lookup_list, *lookup, link);
        } else {
            fprintf(stderr, "Invalid IP address %s\n", value);
            exit(1);
        }
        return (value_from_next);
    invalid_option:
    default:
        fprintf(stderr, "Invalid option: -%s\n", option);
        show_usage();
        exit(1);
    }
    return (ISC_FALSE);
}

/*
 * Because we may be trying to do memory allocation recording, we're going
 * to need to parse the arguments for the -m *before* we start the main
 * argument parsing routine.
 * I'd prefer not to have to do this, but I am not quite sure how else to
 * fix the problem.  Argument parsing in dig involves memory allocation
 * by its nature, so it can't be done in the main argument parser.
 */
static void
preparse_args(int argc, char **argv) {
    int rc;
    char **rv;

    rc = argc;
    rv = argv;
    for (rc--, rv++; rc > 0; rc--, rv++) {
        if (strcmp(rv[0], "-m") == 0) {
            memdebugging = ISC_TRUE;
            isc_mem_debugging = ISC_MEM_DEBUGTRACE |
                ISC_MEM_DEBUGRECORD;
            return;
        }
    }
}


static void
parse_args(isc_boolean_t is_batchfile, isc_boolean_t config_only,
       int argc, char **argv) {
    isc_result_t result;
    isc_textregion_t tr;
    isc_boolean_t firstarg = ISC_TRUE;
    dig_server_t *srv = NULL;
    dig_lookup_t *lookup = NULL;
    dns_rdatatype_t rdtype;
    dns_rdataclass_t rdclass;
    isc_boolean_t open_type_class = ISC_TRUE;
    char batchline[MXNAME];
    int bargc;
    char *bargv[64];
    int rc;
    char **rv;
#ifndef NOPOSIX
    char *homedir;
    char rcfile[256];
#endif
    char *input;

    /*
     * The semantics for parsing the args is a bit complex; if
     * we don't have a host yet, make the arg apply globally,
     * otherwise make it apply to the latest host.  This is
     * a bit different than the previous versions, but should
     * form a consistent user interface.
     *
     * First, create a "default lookup" which won't actually be used
     * anywhere, except for cloning into new lookups
     */

    debug("parse_args()");
    if (!is_batchfile) {
        debug("making new lookup");
        default_lookup = make_empty_lookup();

#ifndef NOPOSIX
        /*
         * Treat .digrc as a special batchfile
         */
        homedir = getenv("HOME");
        if (homedir != NULL)
            snprintf(rcfile, sizeof(rcfile), "%s/.digrc", homedir);
        else
            strcpy(rcfile, ".digrc");
        batchfp = fopen(rcfile, "r");
        if (batchfp != NULL) {
            while (fgets(batchline, sizeof(batchline),
                     batchfp) != 0) {
                debug("config line %s", batchline);
                bargc = 1;
                input = batchline;
                bargv[bargc] = next_token(&input, " \t\r\n");
                while ((bargv[bargc] != NULL) &&
                       (bargc < 62)) {
                    bargc++;
                    bargv[bargc] = next_token(&input, " \t\r\n");
                }

                bargv[0] = argv[0];
                argv0 = argv[0];

                reorder_args(bargc, (char **)bargv);
                parse_args(ISC_TRUE, ISC_TRUE, bargc,
                       (char **)bargv);
            }
            fclose(batchfp);
        }
#endif
    }

    lookup = default_lookup;

    rc = argc;
    rv = argv;
    for (rc--, rv++; rc > 0; rc--, rv++) {
        debug("main parsing %s", rv[0]);
        if (strncmp(rv[0], "%", 1) == 0)
            break;
        if (strncmp(rv[0], "@", 1) == 0) {
            srv = make_server(&rv[0][1]);
            ISC_LIST_APPEND(lookup->my_server_list,
                    srv, link);
        } else if (rv[0][0] == '+') {
            plus_option(&rv[0][1], is_batchfile,
                    lookup);
        } else if (rv[0][0] == '-') {
            if (rc <= 1) {
                if (dash_option(&rv[0][1], NULL,
                        &lookup, &open_type_class)) {
                    rc--;
                    rv++;
                }
            } else {
                if (dash_option(&rv[0][1], rv[1],
                        &lookup, &open_type_class)) {
                    rc--;
                    rv++;
                }
            }
        } else {
            /*
             * Anything which isn't an option
             */
            if (open_type_class) {
                tr.base = rv[0];
                tr.length = strlen(rv[0]);
                if (strncmp(rv[0], "ixfr=", 5) == 0) {
                    lookup->rdtype = dns_rdatatype_ixfr;
                    lookup->ixfr_serial =
                        atoi(&rv[0][5]);
                    lookup->section_question = plusquest;
                    lookup->comments = pluscomm;
                    continue;
                }
                result = dns_rdatatype_fromtext(&rdtype,
                             (isc_textregion_t *)&tr);
                if ((result == ISC_R_SUCCESS) &&
                    (rdtype != dns_rdatatype_ixfr)) {
                    if (rdtype == dns_rdatatype_axfr) {
                        lookup->section_question =
                            plusquest;
                        lookup->comments = pluscomm;
                    }
                    lookup->rdtype = rdtype;
                    continue;
                }
                result = dns_rdataclass_fromtext(&rdclass,
                             (isc_textregion_t *)&tr);
                if (result == ISC_R_SUCCESS) {
                    lookup->rdclass = rdclass;
                    continue;
                }
            }
            if (!config_only) {
                lookup = clone_lookup(default_lookup,
                              ISC_TRUE);
                if (firstarg) {
                    printgreeting(argc, argv, lookup);
                    firstarg = ISC_FALSE;
                }
                strncpy(lookup->textname, rv[0],
                    sizeof(lookup->textname));
                lookup->textname[sizeof(lookup->textname)-1]=0;
                lookup->trace_root = ISC_TF(lookup->trace  ||
                             lookup->ns_search_only);
                lookup->new_search = ISC_TRUE;
                ISC_LIST_APPEND(lookup_list, lookup, link);
                debug("looking up %s", lookup->textname);
            }
            /* XXX Error message */
        }
    }
    /*
     * If we have a batchfile, seed the lookup list with the
     * first entry, then trust the callback in dighost_shutdown
     * to get the rest
     */
    if ((batchname != NULL) && !(is_batchfile)) {
        if (strcmp(batchname, "-") == 0)
            batchfp = stdin;
        else
            batchfp = fopen(batchname, "r");
        if (batchfp == NULL) {
            perror(batchname);
            if (exitcode < 8)
                exitcode = 8;
            fatal("Couldn't open specified batch file");
        }
        /* XXX Remove code dup from shutdown code */
    next_line:
        if (fgets(batchline, sizeof(batchline), batchfp) != 0) {
            bargc = 1;
            debug("batch line %s", batchline);
            if (batchline[0] == '\r' || batchline[0] == '\n'
                || batchline[0] == '#' || batchline[0] == ';')
                goto next_line;
            input = batchline;
            bargv[bargc] = next_token(&input, " \t\r\n");
            while ((bargv[bargc] != NULL) && (bargc < 14)) {
                bargc++;
                bargv[bargc] = next_token(&input, " \t\r\n");
            }

            bargv[0] = argv[0];
            argv0 = argv[0];

            reorder_args(bargc, (char **)bargv);
            parse_args(ISC_TRUE, ISC_FALSE, bargc, (char **)bargv);
        }
    }
    /*
     * If no lookup specified, search for root
     */
    if ((lookup_list.head == NULL) && !config_only) {
        lookup = clone_lookup(default_lookup, ISC_TRUE);
        lookup->trace_root = ISC_TF(lookup->trace ||
                        lookup->ns_search_only);
        lookup->new_search = ISC_TRUE;
        strcpy(lookup->textname, ".");
        lookup->rdtype = dns_rdatatype_ns;
        printgreeting(argc, argv, lookup);
        ISC_LIST_APPEND(lookup_list, lookup, link);
    }
}

/*
 * Callback from dighost.c to allow program-specific shutdown code.  Here,
 * Here, we're possibly reading from a batch file, then shutting down for
 * real if there's nothing in the batch file to read.
 */
void
dighost_shutdown(void) {
    char batchline[MXNAME];
    int bargc;
    char *bargv[16];
    char *input;


    if (batchname == NULL) {
        isc_app_shutdown();
        return;
    }

    if (feof(batchfp)) {
        batchname = NULL;
        isc_app_shutdown();
        if (batchfp != stdin)
            fclose(batchfp);
        return;
    }

    if (fgets(batchline, sizeof(batchline), batchfp) != 0) {
        debug("batch line %s", batchline);
        bargc = 1;
        input = batchline;
        bargv[bargc] = next_token(&input, " \t\r\n");
        while ((bargv[bargc] != NULL) && (bargc < 14)) {
            bargc++;
            bargv[bargc] = next_token(&input, " \t\r\n");
        }

        bargv[0] = argv0;

        reorder_args(bargc, (char **)bargv);
        parse_args(ISC_TRUE, ISC_FALSE, bargc, (char **)bargv);
        start_lookup();
    } else {
        batchname = NULL;
        if (batchfp != stdin)
            fclose(batchfp);
        isc_app_shutdown();
        return;
    }
}

int
main(int argc, char **argv) {
    isc_result_t result;
    dig_server_t *s, *s2;

    ISC_LIST_INIT(lookup_list);
    ISC_LIST_INIT(server_list);
    ISC_LIST_INIT(search_list);

    debug("main()");
    preparse_args(argc, argv);
    progname = argv[0];
    result = isc_app_start();
    check_result(result, "isc_app_start");
    setup_libs();
    parse_args(ISC_FALSE, ISC_FALSE, argc, argv);
    setup_system();
    result = isc_app_onrun(mctx, global_task, onrun_callback, NULL);
    check_result(result, "isc_app_onrun");
    isc_app_run();
    s = ISC_LIST_HEAD(default_lookup->my_server_list);
    while (s != NULL) {
        debug("freeing server %p belonging to %p",
              s, default_lookup);
        s2 = s;
        s = ISC_LIST_NEXT(s, link);
        ISC_LIST_DEQUEUE(default_lookup->my_server_list,
                 (dig_server_t *)s2, link);
        isc_mem_free(mctx, s2);
    }
    isc_mem_free(mctx, default_lookup);
    if (batchname != NULL) {
        if (batchfp != stdin)
            fclose(batchfp);
        batchname = NULL;
    }
    cancel_all();
    destroy_libs();
    isc_app_finish();
    return (exitcode);
}