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A patch from Benjamin Zeckel <bzeckel@cisco.com> to allow
nslookup.c to display the correct default nameservers.
This commit is contained in:
Eric Andersen
parent
583e3ca456
commit
dab3d46b9d
@ -31,6 +31,8 @@
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <resolv.h>
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#include <arpa/inet.h>
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#include "busybox.h"
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/*
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@ -39,19 +41,8 @@
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| [ TODO ]
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| + find out how to use non-default name servers
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| + find out how the real nslookup gets the default name server
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*/
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/* I have to see how the real nslookup does this.
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* I could dig through /etc/resolv.conf, but is there a
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* better (programatic) way?
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*/
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static inline void server_print(void)
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{
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printf("Server: %s\n", "default");
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printf("Address: %s\n\n", "default");
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}
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/* only works for IPv4 */
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static int addr_fprint(char *addr)
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{
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@ -68,24 +59,6 @@ static int addr_fprint(char *addr)
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return 0;
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}
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/* changes a c-string matching the perl regex \d+\.\d+\.\d+\.\d+
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* into a u_int32_t
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*/
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static u_int32_t str_to_addr(const char *addr)
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{
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u_int32_t split[4];
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u_int32_t ip;
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sscanf(addr, "%d.%d.%d.%d",
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&split[0], &split[1], &split[2], &split[3]);
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/* assuming sscanf worked */
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ip = (split[0] << 24) |
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(split[1] << 16) | (split[2] << 8) | (split[3]);
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return htonl(ip);
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}
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/* takes the NULL-terminated array h_addr_list, and
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* prints its contents appropriately
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*/
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@ -116,15 +89,6 @@ static int addr_list_fprint(char **h_addr_list)
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return 0;
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}
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/* gethostbyaddr wrapper */
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static struct hostent *gethostbyaddr_wrapper(const char *address)
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{
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struct in_addr addr;
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addr.s_addr = str_to_addr(address);
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return gethostbyaddr((char *) &addr, 4, AF_INET); /* IPv4 only for now */
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}
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/* print the results as nslookup would */
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static struct hostent *hostent_fprint(struct hostent *host)
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{
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@ -137,6 +101,42 @@ static struct hostent *hostent_fprint(struct hostent *host)
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return host;
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}
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/* changes a c-string matching the perl regex \d+\.\d+\.\d+\.\d+
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* into a u_int32_t
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*/
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static u_int32_t str_to_addr(const char *addr)
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{
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u_int32_t split[4];
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u_int32_t ip;
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sscanf(addr, "%d.%d.%d.%d",
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&split[0], &split[1], &split[2], &split[3]);
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/* assuming sscanf worked */
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ip = (split[0] << 24) |
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(split[1] << 16) | (split[2] << 8) | (split[3]);
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return htonl(ip);
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}
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/* gethostbyaddr wrapper */
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static struct hostent *gethostbyaddr_wrapper(const char *address)
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{
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struct in_addr addr;
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addr.s_addr = str_to_addr(address);
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return gethostbyaddr((char *) &addr, 4, AF_INET); /* IPv4 only for now */
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}
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/* lookup the default nameserver and display it */
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static inline void server_print(void)
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{
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struct sockaddr_in def = _res.nsaddr_list[0];
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char *ip = inet_ntoa(def.sin_addr);
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hostent_fprint(gethostbyaddr_wrapper(ip));
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printf("\n");
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}
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/* naive function to check whether char *s is an ip address */
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static int is_ip_address(const char *s)
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@ -160,6 +160,7 @@ int nslookup_main(int argc, char **argv)
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show_usage();
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}
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res_init();
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server_print();
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if (is_ip_address(argv[1])) {
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host = gethostbyaddr_wrapper(argv[1]);
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@ -170,4 +171,4 @@ int nslookup_main(int argc, char **argv)
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return EXIT_SUCCESS;
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}
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/* $Id: nslookup.c,v 1.22 2001/02/20 06:14:08 andersen Exp $ */
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/* $Id: nslookup.c,v 1.23 2001/06/12 22:21:24 andersen Exp $ */
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79
nslookup.c
79
nslookup.c
@ -31,6 +31,8 @@
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <resolv.h>
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#include <arpa/inet.h>
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#include "busybox.h"
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/*
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@ -39,19 +41,8 @@
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|
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| [ TODO ]
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| + find out how to use non-default name servers
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| + find out how the real nslookup gets the default name server
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*/
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/* I have to see how the real nslookup does this.
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* I could dig through /etc/resolv.conf, but is there a
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* better (programatic) way?
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*/
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static inline void server_print(void)
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{
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printf("Server: %s\n", "default");
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printf("Address: %s\n\n", "default");
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}
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/* only works for IPv4 */
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static int addr_fprint(char *addr)
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{
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@ -68,24 +59,6 @@ static int addr_fprint(char *addr)
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return 0;
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}
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/* changes a c-string matching the perl regex \d+\.\d+\.\d+\.\d+
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* into a u_int32_t
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*/
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static u_int32_t str_to_addr(const char *addr)
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{
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u_int32_t split[4];
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u_int32_t ip;
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sscanf(addr, "%d.%d.%d.%d",
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&split[0], &split[1], &split[2], &split[3]);
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/* assuming sscanf worked */
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ip = (split[0] << 24) |
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(split[1] << 16) | (split[2] << 8) | (split[3]);
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return htonl(ip);
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}
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/* takes the NULL-terminated array h_addr_list, and
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* prints its contents appropriately
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*/
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@ -116,15 +89,6 @@ static int addr_list_fprint(char **h_addr_list)
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return 0;
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}
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/* gethostbyaddr wrapper */
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static struct hostent *gethostbyaddr_wrapper(const char *address)
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{
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struct in_addr addr;
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addr.s_addr = str_to_addr(address);
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return gethostbyaddr((char *) &addr, 4, AF_INET); /* IPv4 only for now */
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}
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/* print the results as nslookup would */
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static struct hostent *hostent_fprint(struct hostent *host)
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{
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@ -137,6 +101,42 @@ static struct hostent *hostent_fprint(struct hostent *host)
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return host;
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}
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/* changes a c-string matching the perl regex \d+\.\d+\.\d+\.\d+
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* into a u_int32_t
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*/
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static u_int32_t str_to_addr(const char *addr)
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{
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u_int32_t split[4];
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u_int32_t ip;
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sscanf(addr, "%d.%d.%d.%d",
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&split[0], &split[1], &split[2], &split[3]);
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/* assuming sscanf worked */
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ip = (split[0] << 24) |
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(split[1] << 16) | (split[2] << 8) | (split[3]);
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return htonl(ip);
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}
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/* gethostbyaddr wrapper */
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static struct hostent *gethostbyaddr_wrapper(const char *address)
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{
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struct in_addr addr;
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addr.s_addr = str_to_addr(address);
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return gethostbyaddr((char *) &addr, 4, AF_INET); /* IPv4 only for now */
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}
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/* lookup the default nameserver and display it */
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static inline void server_print(void)
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{
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struct sockaddr_in def = _res.nsaddr_list[0];
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char *ip = inet_ntoa(def.sin_addr);
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hostent_fprint(gethostbyaddr_wrapper(ip));
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printf("\n");
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}
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/* naive function to check whether char *s is an ip address */
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static int is_ip_address(const char *s)
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@ -160,6 +160,7 @@ int nslookup_main(int argc, char **argv)
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show_usage();
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}
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res_init();
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server_print();
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if (is_ip_address(argv[1])) {
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host = gethostbyaddr_wrapper(argv[1]);
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@ -170,4 +171,4 @@ int nslookup_main(int argc, char **argv)
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return EXIT_SUCCESS;
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}
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/* $Id: nslookup.c,v 1.22 2001/02/20 06:14:08 andersen Exp $ */
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/* $Id: nslookup.c,v 1.23 2001/06/12 22:21:24 andersen Exp $ */
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