From 008d0be72b2f160382c6e880765e96b64a050c65 Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Sat, 3 Jan 2015 12:04:58 +0100 Subject: imported original firmware WRT54GL_v4.30.11_11_US --- release/src/router/busybox/nslookup.c | 183 ++++++++++++++++++++++++++++++++++ 1 file changed, 183 insertions(+) create mode 100644 release/src/router/busybox/nslookup.c (limited to 'release/src/router/busybox/nslookup.c') diff --git a/release/src/router/busybox/nslookup.c b/release/src/router/busybox/nslookup.c new file mode 100644 index 00000000..e54d8326 --- /dev/null +++ b/release/src/router/busybox/nslookup.c @@ -0,0 +1,183 @@ +/* vi: set sw=4 ts=4: */ +/* + * Mini nslookup implementation for busybox + * + * Copyright (C) 1999,2000,2001 by Lineo, inc. + * Written by John Beppu + * + * 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 +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#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 = gethostbyname(argv[1]); + } + hostent_fprint(host); + return EXIT_SUCCESS; +} + +/* $Id: nslookup.c,v 1.1.1.4 2003/10/14 08:09:38 sparq Exp $ */ -- cgit v1.2.3-54-g00ecf