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nslookup: tiny shrink (-5 bytes); add comment about res_init

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inet_common: cosmetics, no code changes
This commit is contained in:
Denis Vlasenko 2008-11-04 21:44:28 +00:00
parent c51457ca5b
commit 391ffa19d1
2 changed files with 9 additions and 11 deletions
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3
libbb/inet_common.c
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@ -63,9 +63,6 @@ int FAST_FUNC INET_resolve(const char *name, struct sockaddr_in *s_in, int hostf
#ifdef DEBUG
res_init();
_res.options |= RES_DEBUG;
#endif
#ifdef DEBUG
bb_error_msg("gethostbyname(%s)", name);
#endif
hp = gethostbyname(name);

17
networking/nslookup.c
View File

@ -15,8 +15,11 @@
#include "libbb.h"
/*
* I'm only implementing non-interactive mode;
* I totally forgot nslookup even had an interactive mode.
* I'm only implementing non-interactive mode;
* I totally forgot nslookup even had an interactive mode.
*
* This applet is the only user of res_init(). Without it,
* you may avoid pulling in _res global from libc.
*/
/* Examples of 'standard' nslookup output
@ -51,7 +54,6 @@ static int print_host(const char *hostname, const char *header)
{
/* We can't use xhost2sockaddr() - we want to get ALL addresses,
* not just one */
struct addrinfo *result = NULL;
int rc;
struct addrinfo hint;
@ -116,7 +118,7 @@ static void server_print(void)
}
/* alter the global _res nameserver structure to use
an explicit dns server instead of what is in /etc/resolv.h */
an explicit dns server instead of what is in /etc/resolv.conf */
static void set_default_dns(char *server)
{
struct in_addr server_in_addr;
@ -135,18 +137,17 @@ int nslookup_main(int argc, char **argv)
* 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)
if (!argv[1] || argv[1][0] == '-' || argc > 3)
bb_show_usage();
/* initialize DNS structure _res used in printing the default
* name server and in the explicit name server option feature. */
res_init();
/* rfc2133 says this enables IPv6 lookups */
/* (but it also says "may be enabled in /etc/resolv.conf|) */
/* (but it also says "may be enabled in /etc/resolv.conf") */
/*_res.options |= RES_USE_INET6;*/
if (argc == 3)
if (argv[2])
set_default_dns(argv[2]);
server_print();