bin/dig/dig.c

	dig.c revision 1a69a1a78cfaa86f3b68bbc965232b7876d4da2a
/*
 * 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.
 */

#include <config.h>

#include <stdlib.h>

extern int h_errno;

#include <isc/app.h>
#include <isc/string.h>
#include <isc/util.h>

#include <dns/message.h>
#include <dns/rdata.h>
#include <dns/rdataset.h>
#include <dns/rdatatype.h>

#include <dig/dig.h>

extern ISC_LIST(dig_lookup_t) lookup_list;
extern ISC_LIST(dig_server_t) server_list;

extern isc_boolean_t tcp_mode, have_ipv6, show_details,
    usesearch, trace;
extern in_port_t port;
extern unsigned int timeout;
extern isc_mem_t *mctx;
extern isc_taskmgr_t *taskmgr;
extern isc_task_t *task;
extern isc_timermgr_t *timermgr;
extern isc_socketmgr_t *socketmgr;
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];
#ifdef TWIDDLE
extern isc_boolean_t twiddle;
#endif

isc_boolean_t short_form = ISC_FALSE;


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

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

static void
show_usage() {
    fputs (
"Usage:  dig [@server] [domain] [q-type] [q-class] {q-opt} {d-opt}\n"
"where:  server,\n"
"        domain   are in the Domain Name System\n"
"        q-class  is one of (in,chaos,...) [default: in]\n"
"        q-type   is one of (a,any,mx,ns,soa,hinfo,axfr,txt,...) [default:a]\n"
"        q-opt    is one of:\n"
"                 -x dot-notation     (shortcut for in-addr 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"
"        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"
"                 +[no]search         (Set whether to use searchlist)\n"
"                 +[no]recursive      (Recursive mode)\n"
"                 +[no]details        (Show details of all requests)\n"
#ifdef TWIDDLE
"                 +twiddle            (Intentionally form bad requests)\n"
#endif
"                 +ndots=###          (Set NDOTS value)\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"
"        Additional d-opts subject to removal before release:\n"
"                 +[no]nssearch       (Search all authorative nameservers)\n"
"                 +[no]identify       (ID responders in short answers)\n"
"        Available but not yet completed:\n"
"                 +[no]trace          (Trace delegation down from root)\n"
, stderr);
}

void
check_next_lookup(dig_lookup_t *lookup) {
    dig_lookup_t *next;
    dig_query_t *query;
    isc_boolean_t still_working=ISC_FALSE;

    debug("In check_next_lookup", stderr);
    for (query = ISC_LIST_HEAD(lookup->q);
         query != NULL;
         query = ISC_LIST_NEXT(query, link)) {
        if (query->working) {
            debug("Still have a worker.", stderr);
            still_working=ISC_TRUE;
        }
    }
    if (still_working)
        return;

    next = ISC_LIST_NEXT(lookup, link);
    debug ("Have %d retries left for %s\n",
           lookup->retries, lookup->textname);
    if ((next == NULL)&&((lookup->retries <= 1)
                 ||tcp_mode || !lookup->pending)) {
        debug("Shutting Down.", stderr);
        isc_app_shutdown();
        return;
    }

    if (tcp_mode) {
        setup_lookup(next);
        do_lookup_tcp(next);
    } else {
        if ((lookup->retries > 1) && (lookup->pending)) {
            lookup->retries --;
            send_udp(lookup);
        } else {
            ENSURE (next != NULL);
            setup_lookup(next);
            do_lookup_udp(next);
        }
    }
}

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->comments) {
        diff = isc_time_microdiff(&now, &query->time_sent);
        printf(";; Query time: %ld msec\n", (long int)diff/1000);
        printf(";; Received %u bytes from %.*s\n",
               bytes, frmsize, frm);
        time (&tnow);
        printf(";; When: %s\n", ctime(&tnow));
    } else if (query->lookup->identify && !short_form) {
        diff = isc_time_microdiff(&now, &query->time_sent);
        printf(";; Received %u bytes from %.*s in %d ms\n",
               bytes, frmsize, frm, (int)diff/1000);
    }
}

void
trying(int frmsize, char *frm, dig_lookup_t *lookup) {
    if (lookup->comments && !short_form)
        printf ("; Trying %.*s\n", frmsize, frm);
}


static void
say_message(dns_rdata_t *rdata, dig_query_t *query) {
    isc_buffer_t *b=NULL, *b2=NULL;
    isc_region_t r, r2;
    isc_result_t result;
    isc_uint64_t diff;
    isc_time_t now;

    result = isc_buffer_allocate(mctx, &b, BUFSIZE);
    check_result (result, "isc_buffer_allocate");
    result = dns_rdata_totext(rdata, NULL, b);
    check_result(result, "dns_rdata_totext");
    isc_buffer_usedregion(b, &r);
    if (!query->lookup->trace && !query->lookup->ns_search_only)
        printf ( "%.*s", (int)r.length, (char *)r.base);
    else {
        result = isc_buffer_allocate(mctx, &b2, BUFSIZE);
        check_result (result, "isc_buffer_allocate");
        result = dns_rdatatype_totext(rdata->type, b2);
        check_result(result, "dns_rdatatype_totext");
        isc_buffer_usedregion(b2, &r2);
        printf ( "%.*s %.*s",(int)r2.length, (char *)r2.base,
             (int)r.length, (char *)r.base);
        isc_buffer_free (&b2);
    }
    if (query->lookup->identify) {
        result = isc_time_now(&now);
        check_result (result, "isc_time_now");
        diff = isc_time_microdiff(&now, &query->time_sent);
        printf (" from server %s in %d ms", query->servname,
            (int)diff/1000);
    }
    printf ("\n");
    isc_buffer_free(&b);
}

static isc_result_t
printsection(dns_message_t *msg, dns_section_t sectionid, char *section_name,
         isc_boolean_t headers, dig_query_t *query)
{
    dns_name_t *name, *print_name;
    dns_rdataset_t *rdataset;
    isc_buffer_t target;
    isc_result_t result, loopresult;
    isc_region_t r;
    dns_name_t empty_name;
    char t[4096];
    isc_boolean_t first;
    isc_boolean_t no_rdata;
    dns_rdata_t rdata;

    if (sectionid == DNS_SECTION_QUESTION)
        no_rdata = ISC_TRUE;
    else
        no_rdata = ISC_FALSE;

    if (headers && query->lookup->comments && !short_form)
        printf(";; %s SECTION:\n", section_name);

    dns_name_init(&empty_name, NULL);

    result = dns_message_firstname(msg, sectionid);
    if (result == ISC_R_NOMORE)
        return (ISC_R_SUCCESS);
    else if (result != ISC_R_SUCCESS)
        return (result);

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

        isc_buffer_init(&target, t, sizeof(t));
        first = ISC_TRUE;
        print_name = name;

        for (rdataset = ISC_LIST_HEAD(name->list);
             rdataset != NULL;
             rdataset = ISC_LIST_NEXT(rdataset, link)) {
            if (!short_form) {
                result = dns_rdataset_totext(rdataset,
                                 print_name,
                                 ISC_FALSE,
                                 no_rdata,
                                 &target);
                if (result != ISC_R_SUCCESS)
                    return (result);
#ifdef USEINITALWS
                if (first) {
                    print_name = &empty_name;
                    first = ISC_FALSE;
                }
#endif
            } else {
                loopresult = dns_rdataset_first(rdataset);
                while (loopresult == ISC_R_SUCCESS) {
                    dns_rdataset_current(rdataset, &rdata);
                    say_message(&rdata, query);
                    loopresult = dns_rdataset_next(
                                 rdataset);
                }
            }

        }
        isc_buffer_usedregion(&target, &r);
        if (no_rdata)
            printf(";%.*s", (int)r.length, (char *)r.base);
        else
            printf("%.*s", (int)r.length, (char *)r.base);

        result = dns_message_nextname(msg, sectionid);
        if (result == ISC_R_NOMORE)
            break;
        else if (result != ISC_R_SUCCESS)
            return (result);
    }

    return (ISC_R_SUCCESS);
}

static isc_result_t
printrdata(dns_message_t *msg, dns_rdataset_t *rdataset, dns_name_t *owner,
       char *set_name, isc_boolean_t headers)
{
    isc_buffer_t target;
    isc_result_t result;
    isc_region_t r;
    char t[4096];

    UNUSED(msg);
    if (headers)
        printf(";; %s SECTION:\n", set_name);

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

    result = dns_rdataset_totext(rdataset, owner, ISC_FALSE, ISC_FALSE,
                     &target);
    if (result != ISC_R_SUCCESS)
        return (result);
    isc_buffer_usedregion(&target, &r);
    printf("%.*s", (int)r.length, (char *)r.base);

    return (ISC_R_SUCCESS);
}

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_rdataset_t *opt, *tsig = NULL;
    dns_name_t *tsigname;

    UNUSED (query);

    result = ISC_R_SUCCESS;

    if (headers) {
        if (query->lookup->comments && !short_form) {
            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]);
            }
            opt = dns_message_getopt(msg);
            if (opt != NULL)
                printf(";; EDNS: version: %u, udp=%u\n",
                       (unsigned int)((opt->ttl &
                               0x00ff0000) >> 16),
                       (unsigned int)opt->rdclass);
            tsigname = NULL;
            tsig = dns_message_gettsig(msg, &tsigname);
            if (tsig != NULL)
                printf(";; PSEUDOSECTIONS: TSIG\n");
        }
    }
    if (! ISC_LIST_EMPTY(msg->sections[DNS_SECTION_QUESTION]) &&
        headers && query->lookup->section_question) {
        printf("\n");
        result = printsection(msg, DNS_SECTION_QUESTION, "QUESTION",
                      ISC_TRUE, query);
        if (result != ISC_R_SUCCESS)
            return (result);
    }
    if (! ISC_LIST_EMPTY(msg->sections[DNS_SECTION_ANSWER]) &&
        query->lookup->section_answer ) {
        if (headers && query->lookup->comments && !short_form)
            printf("\n");
        result = printsection(msg, DNS_SECTION_ANSWER, "ANSWER",
                      headers, query);
        if (result != ISC_R_SUCCESS)
            return (result);
    }
    if ((! ISC_LIST_EMPTY(msg->sections[DNS_SECTION_AUTHORITY]) &&
        headers && query->lookup->section_authority) ||
        ( ISC_LIST_EMPTY(msg->sections[DNS_SECTION_ANSWER]) &&
          headers && query->lookup->section_answer &&
          query->lookup->trace )) {
        if (headers && query->lookup->comments && !short_form)
            printf("\n");
        result = printsection(msg, DNS_SECTION_AUTHORITY, "AUTHORITY",
                      ISC_TRUE, query);
        if (result != ISC_R_SUCCESS)
            return (result);
    }
    if (! ISC_LIST_EMPTY(msg->sections[DNS_SECTION_ADDITIONAL]) &&
        headers && query->lookup->section_additional) {
        if (headers && query->lookup->comments && !short_form)
            printf("\n");
        result = printsection(msg, DNS_SECTION_ADDITIONAL,
                      "ADDITIONAL", ISC_TRUE, query);
        if (result != ISC_R_SUCCESS)
            return (result);
    }
    if ((tsig != NULL) && headers && query->lookup->section_additional) {
        if (headers && query->lookup->comments && !short_form)
            printf("\n");
        result = printrdata(msg, tsig, tsigname,
                    "PSEUDOSECTION TSIG", ISC_TRUE);
        if (result != ISC_R_SUCCESS)
            return (result);
    }
    if (headers && query->lookup->comments && !short_form)
        printf("\n");

    return (result);
}

/*
 * 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.  There is a portability issue here.
 */
void
parse_args(isc_boolean_t is_batchfile, int argc, char **argv) {
    isc_boolean_t have_host = ISC_FALSE, identify = ISC_FALSE,
        trace = ISC_FALSE, ns_search_only = ISC_FALSE,
        forcecomment = ISC_FALSE,
        comments = ISC_TRUE, section_question = ISC_TRUE,
        section_answer = ISC_TRUE, section_authority = ISC_TRUE,
        section_additional = ISC_TRUE, recurse = ISC_TRUE;
    dig_server_t *srv = NULL;
    dig_lookup_t *lookup = NULL;
    char *batchname = NULL;
    char batchline[MXNAME];
    FILE *fp = NULL;
    int bargc;
    char *bargv[16];
    int i, n;
    int adrs[4];

    for (argc--, argv++; argc > 0; argc--, argv++) {
        debug ("Main parsing %s", argv[0]);
        if (strncmp(argv[0], "@", 1) == 0) {
            srv=isc_mem_allocate(mctx, sizeof(struct dig_server));
            if (srv == NULL)
                fatal("Memory allocation failure.");
            strncpy(srv->servername, &argv[0][1], MXNAME-1);
            if (is_batchfile && have_host) {
                if (!lookup->use_my_server_list) {
                    ISC_LIST_INIT (lookup->
                               my_server_list);
                    lookup->use_my_server_list =
                        ISC_TRUE;
                }
                ISC_LIST_APPEND(lookup->my_server_list,
                        srv, link);
            } else {
                ISC_LIST_APPEND(server_list, srv, link);
            }
        } else if ((strcmp(argv[0], "+vc") == 0)
               && (!is_batchfile)) {
            tcp_mode = ISC_TRUE;
        } else if ((strcmp(argv[0], "+novc") == 0)
               && (!is_batchfile)) {
            tcp_mode = ISC_FALSE;
        } else if ((strcmp(argv[0], "+tcp") == 0)
               && (!is_batchfile)) {
            tcp_mode = ISC_TRUE;
        } else if ((strcmp(argv[0], "+notcp") == 0)
               && (!is_batchfile)) {
            tcp_mode = ISC_FALSE;
        } else if (strncmp(argv[0], "+domain=", 8) == 0) {
            strncpy (fixeddomain, &argv[0][8], MXNAME);
        } else if (strncmp(argv[0], "+sea", 4) == 0) {
            usesearch = ISC_TRUE;
        } else if (strncmp(argv[0], "+nosea", 6) == 0) {
            usesearch = ISC_FALSE;
        } else if (strncmp(argv[0], "+time=", 6) == 0) {
            timeout = atoi(&argv[0][6]);
            if (timeout <= 0)
                timeout = 1;
        } else if (strncmp(argv[0], "+tries=", 7) == 0) {
            tries = atoi(&argv[0][7]);
            if (tries <= 0)
                tries = 1;
        } else if (strncmp(argv[0], "+ndots=", 7) == 0) {
            ndots = atoi(&argv[0][7]);
            if (timeout <= 0)
                timeout = 1;
        } else if (strncmp(argv[0], "+rec", 4) == 0) {
            recurse = ISC_TRUE;
        } else if (strncmp(argv[0], "+norec", 6) == 0) {
            recurse = ISC_FALSE;
        } else if (strncmp(argv[0], "+ns", 3) == 0) {
            ns_search_only = ISC_TRUE;
            recurse = ISC_FALSE;
            identify = ISC_TRUE;
            short_form = ISC_TRUE;
            identify = ISC_TRUE;
            if (!forcecomment)
                comments = ISC_FALSE;
            section_additional = ISC_FALSE;
            section_authority = ISC_FALSE;
            section_question = ISC_FALSE;
        } else if (strncmp(argv[0], "+nons", 6) == 0) {
            ns_search_only = ISC_FALSE;
        } else if (strncmp(argv[0], "+tr", 3) == 0) {
            trace = ISC_TRUE;
            recurse = ISC_FALSE;
            identify = ISC_TRUE;
            if (!forcecomment)
                comments = ISC_FALSE;
            section_additional = ISC_FALSE;
            section_authority = ISC_FALSE;
            section_question = ISC_FALSE;
            show_details = ISC_TRUE;
        } else if (strncmp(argv[0], "+notr", 6) == 0) {
            trace = ISC_FALSE;
        } else if (strncmp(argv[0], "+det", 4) == 0) {
            show_details = ISC_TRUE;
        } else if (strncmp(argv[0], "+nodet", 6) == 0) {
            show_details = ISC_FALSE;
        } else if (strncmp(argv[0], "+sho", 4) == 0) {
            short_form = ISC_TRUE;
            if (!forcecomment)
                comments = ISC_FALSE;
            section_additional = ISC_FALSE;
            section_authority = ISC_FALSE;
            section_question = ISC_FALSE;
        } else if (strncmp(argv[0], "+nosho", 6) == 0) {
            short_form = ISC_FALSE;
        } else if (strncmp(argv[0], "+id", 3) == 0) {
            identify = ISC_TRUE;
        } else if (strncmp(argv[0], "+noid", 5) == 0) {
            identify = ISC_FALSE;
        } else if (strncmp(argv[0], "+com", 4) == 0) {
            comments = ISC_TRUE;
            forcecomment = ISC_TRUE;
        } else if (strncmp(argv[0], "+nocom", 6) == 0) {
            comments = ISC_FALSE;
            forcecomment = ISC_FALSE;
        } else if (strncmp(argv[0], "+que", 4) == 0) {
            section_question = ISC_TRUE;
        } else if (strncmp(argv[0], "+noque", 6) == 0) {
            section_question = ISC_FALSE;
        } else if (strncmp(argv[0], "+ans", 4) == 0) {
            section_answer = ISC_TRUE;
        } else if (strncmp(argv[0], "+noans", 6) == 0) {
            section_answer = ISC_FALSE;
        } else if (strncmp(argv[0], "+add", 4) == 0) {
            section_additional = ISC_TRUE;
        } else if (strncmp(argv[0], "+noadd", 6) == 0) {
            section_additional = ISC_FALSE;
        } else if (strncmp(argv[0], "+aut", 4) == 0) {
            section_authority = ISC_TRUE;
        } else if (strncmp(argv[0], "+noaut", 6) == 0) {
            section_authority = ISC_FALSE;
        } else if (strncmp(argv[0], "+all", 4) == 0) {
            section_question = ISC_TRUE;
            section_authority = ISC_TRUE;
            section_answer = ISC_TRUE;
            section_additional = ISC_TRUE;
            comments = ISC_TRUE;
        } else if (strncmp(argv[0], "+noall", 6) == 0) {
            section_question = ISC_FALSE;
            section_authority = ISC_FALSE;
            section_answer = ISC_FALSE;
            section_additional = ISC_FALSE;
            comments = ISC_FALSE;

#ifdef TWIDDLE
        } else if (strncmp(argv[0], "+twiddle", 6) == 0) {
            twiddle = ISC_TRUE;
#endif
        } else if (strncmp(argv[0], "-c", 2) == 0) {
            if (have_host) {
                if (argv[0][2]!=0) {
                    strncpy(lookup->rctext, &argv[0][2],
                        MXRD);
                } else {
                    strncpy(lookup->rctext, argv[1],
                        MXRD);
                    argv++;
                    argc--;
                }
            }
        } else if (strncmp(argv[0], "-t", 2) == 0) {
            if (have_host) {
                if (argv[0][2]!=0) {
                    strncpy(lookup->rttext, &argv[0][2],
                        MXRD);
                } else {
                    strncpy(lookup->rttext, argv[1],
                        MXRD);
                    argv++;
                    argc--;
                }
            }
        } else if (strncmp(argv[0], "-f", 2) == 0) {
            if (argv[0][2]!=0) {
                batchname=&argv[0][2];
            } else {
                batchname=argv[1];
                argv++;
                argc--;
            }
        } else if (strncmp(argv[0], "-p", 2) == 0) {
            if (argv[0][2]!=0) {
                port=atoi(&argv[0][2]);
            } else {
                port=atoi(argv[1]);
                argv++;
                argc--;
            }
        } else if (strncmp(argv[0], "-h", 2) == 0) {
            show_usage();
            exit (0);
        } else if (strncmp(argv[0], "-x", 2) == 0) {
            n = sscanf(argv[1], "%d.%d.%d.%d", &adrs[0], &adrs[1],
                    &adrs[2], &adrs[3]);
            if (n == 0)
                show_usage();
            lookup_counter++;
            if (lookup_counter > LOOKUP_LIMIT)
                fatal ("Too many lookups.");
            lookup = isc_mem_allocate(mctx,
                          sizeof(struct dig_lookup));
            if (lookup == NULL)
                fatal("Memory allocation failure.");
            lookup->pending = ISC_FALSE;
            lookup->textname[0]=0;
            for (i = n - 1; i >= 0; i--) {
                snprintf(batchline, MXNAME/8, "%d.",
                      adrs[i]);
                strncat(lookup->textname, batchline, MXNAME);
            }
            strncat(lookup->textname, "in-addr.arpa.", MXNAME);
            debug("Looking up %s", lookup->textname);
            strcpy(lookup->rttext, "ptr");
            strcpy(lookup->rctext, "in");
            lookup->namespace[0]=0;
            lookup->sendspace[0]=0;
            lookup->sendmsg=NULL;
            lookup->name=NULL;
            lookup->oname=NULL;
            lookup->timer = NULL;
            lookup->xfr_q = NULL;
            lookup->origin = NULL;
            lookup->use_my_server_list = ISC_FALSE;
            lookup->trace = (trace || ns_search_only);
            lookup->trace_root = trace;
            lookup->ns_search_only = ns_search_only;
            lookup->doing_xfr = ISC_FALSE;
            lookup->identify = identify;
            lookup->recurse = recurse;
            lookup->retries = tries;
            lookup->nsfound = 0;
            lookup->comments = comments;
            lookup->section_question = section_question;
            lookup->section_answer = section_answer;
            lookup->section_authority = section_authority;
            lookup->section_additional = section_additional;
            ISC_LIST_INIT(lookup->q);
            lookup->origin = NULL;
            ISC_LIST_INIT(lookup->my_server_list);
            ISC_LIST_APPEND(lookup_list, lookup, link);
            have_host = ISC_TRUE;
            argv++;
            argc--;
        } else {
            if (have_host) {
                ENSURE(lookup != NULL);
                   if (istype(argv[0])) {
                    strncpy(lookup->rttext, argv[0], MXRD);
                    continue;
                   } else if (isclass(argv[0])) {
                       strncpy(lookup->rctext, argv[0],
                           MXRD);
                       continue;
                   }
            }
            lookup_counter++;
            if (lookup_counter > LOOKUP_LIMIT)
                fatal ("Too many lookups.");
            lookup = isc_mem_allocate(mctx,
                          sizeof(struct dig_lookup));
            if (lookup == NULL)
                fatal("Memory allocation failure.");
            lookup->pending = ISC_FALSE;
            strncpy(lookup->textname, argv[0], MXNAME-1);
            lookup->rttext[0]=0;
            lookup->rctext[0]=0;
            lookup->namespace[0]=0;
            lookup->sendspace[0]=0;
            lookup->sendmsg=NULL;
            lookup->name=NULL;
            lookup->oname=NULL;
            lookup->timer = NULL;
            lookup->xfr_q = NULL;
            lookup->origin = NULL;
            lookup->use_my_server_list = ISC_FALSE;
            lookup->doing_xfr = ISC_FALSE;
            lookup->trace = (trace || ns_search_only);
            lookup->trace_root = trace;
            lookup->ns_search_only = ns_search_only;
            lookup->identify = identify;
            lookup->recurse = recurse;
            lookup->retries = tries;
            lookup->nsfound = 0;
            lookup->comments = comments;
            lookup->section_question = section_question;
            lookup->section_answer = section_answer;
            lookup->section_authority = section_authority;
            lookup->section_additional = section_additional;
            ISC_LIST_INIT(lookup->q);
            ISC_LIST_APPEND(lookup_list, lookup, link);
            lookup->origin = NULL;
            ISC_LIST_INIT(lookup->my_server_list);
            have_host = ISC_TRUE;
            debug("Looking up %s", lookup->textname);
        }
    }
    if (batchname != NULL) {
        fp = fopen(batchname, "r");
        if (fp == NULL) {
            perror(batchname);
            fatal("Couldn't open specified batch file.");
        }
        while (fgets(batchline, MXNAME, fp) != 0) {
            debug ("Batch line %s", batchline);
            bargc=1;
            bargv[bargc]=strtok(batchline, " \t\r\n");
            while ((bargv[bargc] != NULL) &&
                   (bargc < 14 )) {
                bargc++;
                bargv[bargc]=strtok(NULL, " \t\r\n");
            }
            bargc--;
            bargv[0]="dig";
            reorder_args(bargc+1, (char**)bargv);
            parse_args(ISC_TRUE, bargc+1, (char**)bargv);
        }
    }
    if (lookup_list.head == NULL) {
        lookup_counter++;
        if (lookup_counter > LOOKUP_LIMIT)
            fatal ("Too many lookups.");
        lookup = isc_mem_allocate(mctx, sizeof(struct dig_lookup));
        if (lookup == NULL)
            fatal("Memory allocation failure.");
        lookup->pending = ISC_FALSE;
        lookup->rctext[0]=0;
        lookup->namespace[0]=0;
        lookup->sendspace[0]=0;
        lookup->sendmsg=NULL;
        lookup->name=NULL;
        lookup->oname=NULL;
        lookup->timer = NULL;
        lookup->xfr_q = NULL;
        lookup->origin = NULL;
        lookup->use_my_server_list = ISC_FALSE;
        lookup->doing_xfr = ISC_FALSE;
        lookup->trace = (trace || ns_search_only);
        lookup->trace_root = trace;
        lookup->ns_search_only = ns_search_only;
        lookup->identify = identify;
        lookup->recurse = recurse;
        lookup->retries = tries;
        lookup->nsfound = 0;
        lookup->comments = comments;
        lookup->section_question = section_question;
        lookup->section_answer = section_answer;
        lookup->section_authority = section_authority;
        lookup->section_additional = section_additional;
        ISC_LIST_INIT(lookup->q);
        ISC_LIST_INIT(lookup->my_server_list);
        strcpy(lookup->textname, ".");
        strcpy(lookup->rttext, "NS");
        lookup->rctext[0]=0;
        ISC_LIST_APPEND(lookup_list, lookup, link);
    }
}