bin/dig/dig.c

	dig.c revision df5503799f5d2609cc759a7a1f3274daeb728236
/*
 * 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

extern int h_errno;

#include <isc/types.h>
#include <isc/app.h>
#include <isc/assertions.h>
#include <isc/error.h>
#include <isc/mem.h>
#include <isc/net.h>
#include <isc/netdb.h>
#include <isc/result.h>
#include <isc/sockaddr.h>
#include <isc/socket.h>
#include <isc/task.h>
#include <isc/timer.h>
#include <isc/time.h>
#include <isc/buffer.h>
#include <isc/list.h>
#include <isc/util.h>

#include <dns/types.h>
#include <dns/message.h>
#include <dns/name.h>
#include <dns/fixedname.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdataclass.h>
#include <dns/rdatatype.h>
#include <dns/result.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, recurse, have_ipv6;
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 dns_name_t rootorg;
extern char *rootspace[BUFSIZE];
extern isc_buffer_t rootbuf;
extern int sendcount;

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() {
    fatal("Usage.");
}

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

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

    next = ISC_LIST_NEXT(lookup, link);
    if (next == NULL) {
#ifdef DEBUG
        fputs("Shutting Down.\n",stderr);
#endif
        isc_app_shutdown();
        return;
    }

    setup_lookup(next);
#ifdef NEVER
    if (tcp_mode)
        do_lookup_tcp(next);
    else
#endif
        do_lookup_udp(next);

}

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

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

    if (headers)
        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)) {
            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
        }
        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) {
        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 ) {
        printf("\n");
        result = printsection(msg, DNS_SECTION_QUESTION, "QUESTION",
                      ISC_TRUE);
        if (result != ISC_R_SUCCESS)
            return (result);
    }
    if (! ISC_LIST_EMPTY(msg->sections[DNS_SECTION_ANSWER])) {
        if (headers)
            printf("\n");
        result = printsection(msg, DNS_SECTION_ANSWER, "ANSWER",
                      headers);
        if (result != ISC_R_SUCCESS)
            return (result);
    }
    if (! ISC_LIST_EMPTY(msg->sections[DNS_SECTION_AUTHORITY]) &&
        headers ) {
        printf("\n");
        result = printsection(msg, DNS_SECTION_AUTHORITY, "AUTHORITY",
                      ISC_TRUE);
        if (result != ISC_R_SUCCESS)
            return (result);
    }
    if (! ISC_LIST_EMPTY(msg->sections[DNS_SECTION_ADDITIONAL]) &&
        headers ) {
        printf("\n");
        result = printsection(msg, DNS_SECTION_ADDITIONAL,
                      "ADDITIONAL", ISC_TRUE);
        if (result != ISC_R_SUCCESS)
            return (result);
    }
    if ((tsig != NULL) && headers) {
        printf("\n");
        result = printrdata(msg, tsig, tsigname,
                    "PSEUDOSECTION TSIG", ISC_TRUE);
        if (result != ISC_R_SUCCESS)
            return (result);
    }
    if (headers)
        printf("\n");

    return (result);
}

/*
** 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;
    dig_server_t *srv = NULL;
    dig_lookup_t *lookup = NULL;
    char *batchname = NULL;
    char batchline[MXNAME];
    FILE *fp = NULL;
    int bargc;
    char *bargv[8];
    int i,n;
    int adrs[4];

    for (argc--, argv++; argc > 0; argc--, argv++) {
        if ((strncmp(argv[0],"@",1) == 0)
            && (!is_batchfile)) {
            srv=isc_mem_allocate(mctx, sizeof(struct dig_server));
            if (srv == NULL)
                fatal("Memory allocation failure.");
            strncpy(srv->servername,&argv[0][1],MXNAME-1);
            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 ((strncmp(argv[0],"+time=",6) == 0) ||
               (strncmp(argv[0],"+tim=",5) == 0) ||
               (strncmp(argv[0],"+ti=",4) == 0)) {
            timeout = atoi(&argv[0][6]);
            if (timeout <= 0)
                timeout = 1;
        } else if (strncmp(argv[0],"+rec",6) == 0) {
            recurse = ISC_TRUE;
        } else if (strncmp(argv[0],"+norec",6) == 0) {
            recurse = ISC_FALSE;
        } 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],"-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 = 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);
#ifdef DEBUG
            fprintf(stderr,"Looking up %s\n",lookup->textname);
#endif
            strcpy(lookup->rttext, "ptr");
            strcpy(lookup->rctext, "in");
            lookup->namespace[0]=0;
            lookup->sendspace[0]=0;
            lookup->sendmsg=NULL;
            lookup->name=NULL;
            lookup->timer = NULL;
            lookup->xfr_q = NULL;
            lookup->use_my_server_list = ISC_FALSE;
            lookup->ns_search_only = ISC_FALSE;
            lookup->doing_xfr = ISC_FALSE;
            ISC_LIST_INIT(lookup->q);
            ISC_LIST_APPEND(lookup_list, lookup, link);
            have_host = ISC_TRUE;
            argv++;
            argc--;
        } else {
            if (have_host) {
                ENSURE(lookup != NULL);
                if (isclass(argv[0])) {
                    strncpy(lookup->rctext,argv[0],
                         MXRD);
                    continue;
                } else if (istype(argv[0])) {
                    strncpy(lookup->rttext,argv[0], MXRD);
                    continue;
                }
            }
            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->timer = NULL;
            lookup->xfr_q = NULL;
            lookup->use_my_server_list = ISC_FALSE;
            lookup->doing_xfr = ISC_FALSE;
            lookup->ns_search_only = ISC_FALSE;
            ISC_LIST_INIT(lookup->q);
            ISC_LIST_APPEND(lookup_list, lookup, link);
            have_host = ISC_TRUE;
#ifdef DEBUG
            fprintf(stderr, "Looking up %s\n", lookup->textname);
#endif
        }
    }
    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) {
            bargc=1;
            bargv[bargc]=strtok(batchline, " \t");
            while (bargv[bargc] != NULL) {
                bargc++;
                bargv[bargc]=strtok(NULL, " \t");
            }
            bargc--;
            bargv[0]="dig";
#ifdef DEBUG
            fprintf(stderr,"Parsing %d:%s\n",bargc,bargv[1]);
#endif
            parse_args(ISC_TRUE, bargc, (char**)bargv);
        }
    }
    if (lookup_list.head == NULL) {
        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->timer = NULL;
        lookup->xfr_q = NULL;
        lookup->use_my_server_list = ISC_FALSE;
        lookup->doing_xfr = ISC_FALSE;
        lookup->ns_search_only = ISC_FALSE;
        ISC_LIST_INIT(lookup->q);
        strcpy(lookup->textname,".");
        strcpy(lookup->rttext, "NS");
        lookup->rctext[0]=0;
        ISC_LIST_APPEND(lookup_list, lookup, link);
    }
}