diff options
Diffstat (limited to 'nslookup.c')
| -rw-r--r-- | nslookup.c | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/nslookup.c b/nslookup.c deleted file mode 100644 index 3e32ca9..0000000 --- a/nslookup.c +++ /dev/null @@ -1,183 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * Mini nslookup implementation for busybox - * - * Copyright (C) 1999,2000,2001 by Lineo, inc. - * Written by John Beppu <beppu@lineo.com> - * - * 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 - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - */ - -#include <ctype.h> -#include <errno.h> -#include <stdio.h> -#include <string.h> -#include <stdlib.h> - -#include <netdb.h> -#include <sys/socket.h> -#include <sys/types.h> -#include <netinet/in.h> -#include <resolv.h> -#include <arpa/inet.h> -#include "busybox.h" - -/* - | 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 */ -static int addr_fprint(char *addr) -{ - u_int8_t split[4]; - u_int32_t ip; - u_int32_t *x = (u_int32_t *) addr; - - ip = ntohl(*x); - split[0] = (ip & 0xff000000) >> 24; - split[1] = (ip & 0x00ff0000) >> 16; - split[2] = (ip & 0x0000ff00) >> 8; - split[3] = (ip & 0x000000ff); - printf("%d.%d.%d.%d", split[0], split[1], split[2], split[3]); - return 0; -} - -/* takes the NULL-terminated array h_addr_list, and - * prints its contents appropriately - */ -static int addr_list_fprint(char **h_addr_list) -{ - int i, j; - char *addr_string = (h_addr_list[1]) - ? "Addresses: " : "Address: "; - - printf("%s ", addr_string); - for (i = 0, j = 0; h_addr_list[i]; i++, j++) { - addr_fprint(h_addr_list[i]); - - /* real nslookup does this */ - if (j == 4) { - if (h_addr_list[i + 1]) { - printf("\n "); - } - j = 0; - } else { - if (h_addr_list[i + 1]) { - printf(", "); - } - } - - } - printf("\n"); - return 0; -} - -/* print the results as nslookup would */ -static struct hostent *hostent_fprint(struct hostent *host) -{ - if (host) { - printf("Name: %s\n", host->h_name); - addr_list_fprint(host->h_addr_list); - } else { - printf("*** Unknown host\n"); - } - return host; -} - -/* changes a c-string matching the perl regex \d+\.\d+\.\d+\.\d+ - * into a u_int32_t - */ -static u_int32_t str_to_addr(const char *addr) -{ - u_int32_t split[4]; - u_int32_t ip; - - sscanf(addr, "%d.%d.%d.%d", - &split[0], &split[1], &split[2], &split[3]); - - /* assuming sscanf worked */ - ip = (split[0] << 24) | - (split[1] << 16) | (split[2] << 8) | (split[3]); - - return htonl(ip); -} - -/* gethostbyaddr wrapper */ -static struct hostent *gethostbyaddr_wrapper(const char *address) -{ - struct in_addr addr; - - addr.s_addr = str_to_addr(address); - return gethostbyaddr((char *) &addr, 4, AF_INET); /* IPv4 only for now */ -} - -#ifdef __UCLIBC__ -#warning FIXME after fixing uClibc to define struct _res -static inline void server_print(void) -{ - printf("Server: %s\n", "default"); - printf("Address: %s\n\n", "default"); -} -#else -/* lookup the default nameserver and display it */ -static inline void server_print(void) -{ - struct sockaddr_in def = _res.nsaddr_list[0]; - char *ip = inet_ntoa(def.sin_addr); - - hostent_fprint(gethostbyaddr_wrapper(ip)); - printf("\n"); -} -#endif - -/* naive function to check whether char *s is an ip address */ -static int is_ip_address(const char *s) -{ - while (*s) { - if ((isdigit(*s)) || (*s == '.')) { - s++; - continue; - } - return 0; - } - return 1; -} - -/* ________________________________________________________________________ */ -int nslookup_main(int argc, char **argv) -{ - struct hostent *host; - - if (argc < 2 || *argv[1]=='-') { - show_usage(); - } - - res_init(); - server_print(); - if (is_ip_address(argv[1])) { - host = gethostbyaddr_wrapper(argv[1]); - } else { - host = xgethostbyname(argv[1]); - } - hostent_fprint(host); - return EXIT_SUCCESS; -} - -/* $Id: nslookup.c,v 1.25 2001/10/01 17:50:25 kraai Exp $ */ |