bind/bin/dig/host.c

/*
 * 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 <isc/commandline.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>
#include <dig/printmsg.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_TRUE,
	filter=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"
};

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

	next = ISC_LIST_NEXT (lookup, link);
	if (next == NULL) {
#ifdef DEBUG
		puts ("Shutting Down.");
#endif
		isc_app_shutdown();
		return;
	}
	
	setup_lookup(next);
#ifdef NEVER
	if (tcp_mode)
		do_lookup_tcp(next);
	else
#endif	
		do_lookup_udp(next);

}

static void
show_usage() {
	fatal ("Usage.");
}				

static void
say_message(char *host, char *msg, dns_rdata_t *rdata, isc_buffer_t *target) {
	isc_region_t r;
	isc_result_t result;

	result = dns_rdata_totext( rdata, NULL, target);
	check_result(result, "dns_rdata_totext");
	isc_buffer_used(target, &r);
	printf ( "%s %s %.*s\n", host, msg, (int)r.length,
		 (char *)r.base);
}				
	

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;
	dns_rdata_t rdata;
	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;
	
	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, ISC_BUFFERTYPE_TEXT);
		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);
					if (rdata.type == dns_rdatatype_a) {
						say_message ("Something",
							     "has address",
							     &rdata,
							     &target);
					} else if 
					  (rdata.type == dns_rdatatype_mx) {
						say_message ("Something",
							     "mail server",
							     &rdata,
							     &target);
					} else if 
					  (rdata.type == dns_rdatatype_ns) {
						say_message ("Something",
							     "name server",
							     &rdata,
							     &target);
					}
					loopresult = dns_rdataset_next(
								 rdataset);
				}
			}
		}
		if (!short_form) {
			isc_buffer_used(&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, ISC_BUFFERTYPE_TEXT);

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

	return (ISC_R_SUCCESS);
}

isc_result_t
printmessage(dns_message_t *msg, isc_boolean_t headers) {
	isc_boolean_t did_flag = ISC_FALSE;
	dns_rdataset_t *opt, *tsig;
	dns_name_t *tsigname;
	isc_result_t result;

	result = ISC_R_SUCCESS;

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

	return (result);
}

void
parse_args(isc_boolean_t is_batchfile, int argc, char **argv) {
	isc_boolean_t have_host=ISC_FALSE,
		recursion=ISC_TRUE,
		xfr_mode=ISC_FALSE;
	char hostname[MXNAME];
	char servname[MXNAME];
	char querytype[32]="a";
	dig_server_t *srv;
	dig_lookup_t *lookup;
	int c;

	while ((c = isc_commandline_parse(argc, argv,"lvwrdt:a")) != EOF) {
		switch (c) {
		case 'l':
			tcp_mode = ISC_TRUE;
			xfr_mode = ISC_TRUE;
			filter = ISC_TRUE;
			strcpy (querytype, "axfr");
			break;
		case 'v':
		case 'd':
			short_form = ISC_FALSE;
			break;
		case 'r':
			recursion = ISC_FALSE;
			break;
		case 't':
			strncpy (querytype, isc_commandline_argument, 32);
			break;
		case 'a':
			strcpy (querytype, "any");
			short_form = ISC_FALSE;
			break;
		case 'w':
			/* XXXMWS This should be a system-indep.
			   thing! */
			timeout = 32767;
			break;
		}
	}
	if (isc_commandline_index >= argc) {
		show_usage();
	}
	strncpy (hostname, argv[isc_commandline_index], MXNAME);
	if (argc > isc_commandline_index+1) {
			srv=isc_mem_allocate(mctx, sizeof(struct dig_server));
			if (srv == NULL)
				fatal ("Memory allocation failure.");
			strncpy(srv->servername,
				argv[isc_commandline_index+1],MXNAME-1);
#ifdef DEBUG
			fprintf (stderr, "Server is %s\n",srv->servername);
#endif
			ISC_LIST_APPEND(server_list, srv, link);
	}
	
	lookup = isc_mem_allocate (mctx, 
				   sizeof(struct dig_lookup));
	if (lookup == NULL)	
		fatal ("Memory allocation failure.");
	lookup->pending = ISC_FALSE;
	strncpy (lookup->textname, hostname, MXNAME);
	strncpy (lookup->rttext, querytype, 32);
	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->doing_xfr = ISC_FALSE;
	ISC_LIST_INIT(lookup->q);
	ISC_LIST_APPEND(lookup_list, lookup, link);
	have_host = ISC_TRUE;
}