This commit was generated by cvs2svn to compensate for changes in r11719,
which included commits to RCS files with non-trunk default branches.
This commit is contained in:
Peter Wemm
commit
6bfa3896ed
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=11720
6
usr.bin/dnsquery/Makefile
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6
usr.bin/dnsquery/Makefile
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# $Id$
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PROG= dnsquery
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MAN1= dnsquery.1
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.include <bsd.prog.mk>
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164
usr.bin/dnsquery/dnsquery.1
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164
usr.bin/dnsquery/dnsquery.1
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.TH DNSQUERY 1 "10 March 1990"
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.UC 6
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.SH NAME
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dnsquery \- query domain name servers using resolver
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.SH SYNOPSIS
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.B dnsquery
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[-n
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.I nameserver]
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[-t
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.I type]
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[-c
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.I class]
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[-r
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.I retry]
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[-p
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.I retry period]
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[-d] [-s] [-v] host
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.SH DESCRIPTION
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The
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.IR dnsquery
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program is a general interface to nameservers via
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BIND resolver library calls. The program supports
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queries to the nameserver with an opcode of QUERY.
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This program is intended to be a replacement or
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supplement to programs like nstest, nsquery and
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nslookup. All arguments except for
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.IR host
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and
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.IR ns
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are treated without case-sensitivity.
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.SH OPTIONS
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.TP 1i
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.B \-n
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The nameserver to be used in the query. Nameservers can appear as either
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Internet addresses of the form w.x.y.z or can appear as domain names.
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(default: as specified in /etc/resolv.conf)
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.TP 1i
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.B \-t
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The type of resource record of interest. Types include:
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.RS 1.5i
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.TP 1i
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A
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address
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.PD 0
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.TP 1i
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NS
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nameserver
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.TP 1i
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CNAME
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canonical name
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.TP 1i
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PTR
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domain name pointer
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.TP 1i
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SOA
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start of authority
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.TP 1i
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WKS
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well-known service
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.TP 1i
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HINFO
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host information
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.TP 1i
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MINFO
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mailbox information
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.TP 1i
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MX
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mail exchange
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.TP 1i
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RP
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responsible person
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.TP 1i
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MG
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mail group member
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.TP 1i
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AFSDB
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DCE or AFS server
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.TP 1i
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ANY
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wildcard
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.RE
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.PD
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.IP
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Note that any case may be used. (default: ANY)
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.TP 1i
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.B \-c
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The class of resource records of interest.
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Classes include:
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.RS 2i
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.TP 1i
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IN
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Internet
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.PD 0
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.TP 1i
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HS
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Hesiod
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.TP 1i
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CHAOS
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Chaos
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.TP 1i
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ANY
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wildcard
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.RE
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.PD
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.IP
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Note that any case may be used. (default: IN)
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.TP 1i
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.B \-r
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The number of times to retry if the nameserver is
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not responding. (default: 4)
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.TP 1i
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.B \-p
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Period to wait before timing out. (default: RES_TIMEOUT)
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.IR options
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field. (default: any answer)
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.TP 1i
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.B \-d
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Turn on debugging. This sets the RES_DEBUG bit of the resolver's
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.IR options
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field. (default: no debugging)
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.TP 1i
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.B \-s
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Use a
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.IR stream
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rather than a packet. This uses a TCP stream connection with
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the nameserver rather than a UDP datagram. This sets the
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RES_USEVC bit of the resolver's
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.IR options
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field. (default: UDP)
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.TP 1i
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.B \-v
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Synonym for the 's' flag.
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.TP 1i
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.B host
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The name of the host (or domain) of interest.
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.SH FILES
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/etc/resolv.conf to get the default ns and search lists
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.br
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<arpa/nameser.h> list of usable RR types and classes
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.br
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<resolv.h> list of resolver flags
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.SH "SEE ALSO"
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nslookup(8), nstest(1), nsquery(1),
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named(8), resolver(5)
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.SH DIAGNOSTICS
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If the resolver fails to answer the query and debugging has not been
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turned on,
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.IR dnsquery
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will simply print a message like:
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.TP 1i
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Query failed (rc = 1) : Unknown host
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.LP
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The value of the return code is supplied by h_errno.
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.SH BUGS
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Queries of a class other than IN can have interesting results
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since ordinarily a nameserver only has a list of root nameservers
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for class IN resource records.
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.PP
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Query uses a call to inet_addr() to determine if the argument
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for the '-n' option is a valid Internet address. Unfortunately,
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inet_addr() seems to cause a segmentation fault with some (bad)
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addresses (e.g. 1.2.3.4.5).
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.SH AUTHOR
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Bryan Beecher
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202
usr.bin/dnsquery/dnsquery.c
Normal file
202
usr.bin/dnsquery/dnsquery.c
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@ -0,0 +1,202 @@
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <errno.h>
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#include "../conf/portability.h"
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extern int errno;
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extern int h_errno;
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extern char *h_errlist[];
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main(argc, argv)
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int argc;
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char *argv[];
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{
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char name[MAXDNAME];
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u_char answer[8*1024];
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register int c, i = 0;
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unsigned long ul;
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int nameservers = 0, class, type, len;
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struct in_addr q_nsaddr[MAXNS];
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struct hostent *q_nsname;
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extern int optind, opterr;
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extern char *optarg;
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HEADER *hp;
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int stream = 0, debug = 0;
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/* set defaults */
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len = MAXDNAME;
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gethostname(name, len);
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class = C_IN;
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type = T_ANY;
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/* if no args, exit */
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if (argc == 1) {
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fprintf(stderr, "Usage: %s [-h] host [-n ns] [-t type] [-c class] [-r retry] [-p period] [-s] [-v] [-d] [-a]\n", argv[0]);
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exit(-1);
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}
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/* handle args */
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while ((c = getopt(argc, argv, "c:dh:n:p:r:st:u:v")) != EOF) {
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switch (c) {
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case 'r' : _res.retry = atoi(optarg);
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break;
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case 'p' : _res.retrans = atoi(optarg);
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break;
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case 'h' : strcpy(name, optarg);
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break;
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case 'c' : if (!strcasecmp(optarg, "IN"))
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class = C_IN;
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else if (!strcasecmp(optarg, "HS"))
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class = C_HS;
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else if (!strcasecmp(optarg, "CHAOS"))
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class = C_CHAOS;
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else if (!strcasecmp(optarg, "ANY"))
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class = C_ANY;
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else {
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class = T_ANY;
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fprintf(stderr, "optarg=%s\n", optarg);
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}
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break;
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case 't' : if (!strcasecmp(optarg, "A"))
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type = T_A;
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else if (!strcasecmp(optarg, "NS"))
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type = T_NS;
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else if (!strcasecmp(optarg, "CNAME"))
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type = T_CNAME;
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else if (!strcasecmp(optarg, "SOA"))
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type = T_SOA;
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else if (!strcasecmp(optarg, "WKS"))
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type = T_WKS;
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else if (!strcasecmp(optarg, "PTR"))
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type = T_PTR;
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else if (!strcasecmp(optarg, "HINFO"))
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type = T_HINFO;
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else if (!strcasecmp(optarg, "MINFO"))
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type = T_MINFO;
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else if (!strcasecmp(optarg, "MX"))
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type = T_MX;
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else if (!strcasecmp(optarg, "MG"))
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type = T_MG;
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else if (!strcasecmp(optarg, "RP"))
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type = T_RP;
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else if (!strcasecmp(optarg, "TXT"))
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type = T_TXT;
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else if (!strcasecmp(optarg, "AFSDB"))
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type = T_AFSDB;
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else if (!strcasecmp(optarg, "ANY"))
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type = T_ANY;
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else {
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fprintf(stderr, "Bad type (%s)\n", optarg);
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exit(-1);
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}
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break;
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case 'd' : debug++;
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break;
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case 's' :
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case 'v' : stream++;
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break;
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case 'n' :
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/*
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* If we set some nameservers here without
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* using gethostbyname() first, then they will
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* get overwritten when we do the first query.
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* So, we must init the resolver before any
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* of this.
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*/
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if (!(_res.options & RES_INIT))
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if (res_init() == -1) {
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fprintf(stderr,
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"res_init() failed\n");
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exit(-1);
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}
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if (nameservers >= MAXNS) break;
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(void) inet_aton(optarg,
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&q_nsaddr[nameservers]);
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if (!inet_aton(optarg, &ul)) {
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q_nsname = gethostbyname(optarg);
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if (q_nsname == 0) {
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fprintf(stderr,
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"Bad nameserver (%s)\n",
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optarg);
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exit(-1);
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}
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bcopy((char *) q_nsname->h_addr,
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(char *) &q_nsaddr[nameservers],
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INADDRSZ);
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}
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else
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q_nsaddr[nameservers].s_addr = ul;
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nameservers++;
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break;
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default : fprintf(stderr,
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"\tUsage: %s [-n ns] [-h host] [-t type] [-c class] [-r retry] [-p period] [-s] [-v] [-d] [-a]\n", argv[0]);
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exit(-1);
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}
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}
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if (optind < argc)
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strcpy(name, argv[optind]);
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len = sizeof(answer);
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/*
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* set these here so they aren't set for a possible call to
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* gethostbyname above
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*/
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if (debug)
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_res.options |= RES_DEBUG;
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if (stream)
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_res.options |= RES_USEVC;
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/* if the -n flag was used, add them to the resolver's list */
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if (nameservers != 0) {
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_res.nscount = nameservers;
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for (i = nameservers - 1; i >= 0; i--) {
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_res.nsaddr_list[i].sin_addr.s_addr = q_nsaddr[i].s_addr;
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_res.nsaddr_list[i].sin_family = AF_INET;
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_res.nsaddr_list[i].sin_port = htons(NAMESERVER_PORT);
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}
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}
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/*
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* if the -h arg is fully-qualified, use res_query() since
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* using res_search() will lead to use of res_querydomain()
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* which will strip the trailing dot
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*/
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if (name[strlen(name) - 1] == '.') {
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if (res_query(name, class, type, answer, len) < 0) {
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hp = (HEADER *) answer;
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if ((hp->rcode == 0) && (hp->ancount > 0))
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__p_query(answer);
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else
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fprintf(stderr, "Query failed (h_errno = %d) : %s\n",
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h_errno, h_errlist[h_errno]);
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exit(-1);
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}
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}
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else if (res_search(name, class, type, answer, len) < 0) {
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hp = (HEADER *) answer;
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if ((hp->rcode == 0) && (hp->ancount > 0))
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__p_query(answer);
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else
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fprintf(stderr, "Query failed (h_errno = %d) : %s\n",
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h_errno, h_errlist[h_errno]);
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exit(-1);
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}
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__p_query(answer);
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exit(0);
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}
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