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Commited patch from bug #1182

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Although ssrat@mailbag.com says this is not GNU behaviour, it really *is*
(man nslookup)
This commit is contained in:
Robert Griebl 2002-07-24 00:56:56 +00:00
parent 41369af3f2
commit 31a2e20bd3
1 changed files with 36 additions and 8 deletions
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44
networking/nslookup.c
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@ -5,6 +5,9 @@
* Copyright (C) 1999,2000 by Lineo, inc. and John Beppu
* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
*
* Correct default name server display and explicit name server option
* added by Ben Zeckel <bzeckel@hmc.edu> June 2001
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
@ -38,9 +41,6 @@
/*
| I'm only implementing non-interactive mode;
| I totally forgot nslookup even had an interactive mode.
|
| [ TODO ]
| + find out how to use non-default name servers
*/
/* only works for IPv4 */
@ -138,6 +138,19 @@ static inline void server_print(void)
printf("\n");
}
/* alter the global _res nameserver structure to use
an explicit dns server instead of what is in /etc/resolv.h */
static inline void set_default_dns(char *server)
{
struct in_addr server_in_addr;
if(inet_aton(server,&server_in_addr))
{
_res.nscount = 1;
_res.nsaddr_list[0].sin_addr = server_in_addr;
}
}
/* naive function to check whether char *s is an ip address */
static int is_ip_address(const char *s)
{
@ -156,11 +169,26 @@ int nslookup_main(int argc, char **argv)
{
struct hostent *host;
if (argc < 2 || *argv[1]=='-') {
show_usage();
}
/*
* initialize DNS structure _res used in printing the default
* name server and in the explicit name server option feature.
*/
res_init();
/*
* We allow 1 or 2 arguments.
* The first is the name to be looked up and the second is an
* optional DNS server with which to do the lookup.
* More than 3 arguments is an error to follow the pattern of the
* standard nslookup
*/
if (argc < 2 || *argv[1]=='-' || argc > 3)
show_usage();
else if(argc == 3)
set_default_dns(argv[2]);
server_print();
if (is_ip_address(argv[1])) {
host = gethostbyaddr_wrapper(argv[1]);
@ -171,4 +199,4 @@ int nslookup_main(int argc, char **argv)
return EXIT_SUCCESS;
}
/* $Id: nslookup.c,v 1.28 2002/04/27 04:06:55 andersen Exp $ */
/* $Id: nslookup.c,v 1.29 2002/07/24 00:56:56 sandman Exp $ */