diff options
Diffstat (limited to 'networking')
| -rw-r--r-- | networking/nslookup.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/networking/nslookup.c b/networking/nslookup.c new file mode 100644 index 000000000..0a2a57437 --- /dev/null +++ b/networking/nslookup.c @@ -0,0 +1,168 @@ +/* + * Mini nslookup implementation for busybox + * + * + * Copyright (C) 2000 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 "internal.h" +#include <ctype.h> +#include <errno.h> +#include <stdio.h> +#include <string.h> + +#include <netdb.h> +#include <sys/socket.h> +#include <sys/types.h> +#include <netinet/in.h> + + +static const char nslookup_usage[] = +"only implementing non-interactive mode\n" +"I totally forgot nslookup even had an interactive mode\n" +; + + +/* */ +static void +server_fprint(FILE *dst) +{ + fprintf(dst, "Server: %s\n", "something"); + fprintf(dst, "Address: %s\n\n", "something"); +} + +/* only works for IPv4 */ +static int +addr_fprint(char *addr, FILE *dst) +{ + uint8_t split[4]; + uint32_t ip; + uint32_t *x = (uint32_t *) addr; + + ip = ntohl(*x); + split[0] = (ip & 0xff000000) >> 24; + split[1] = (ip & 0x00ff0000) >> 16; + split[2] = (ip & 0x0000ff00) >> 8; + split[3] = (ip & 0x000000ff); + fprintf ( + dst, "%d.%d.%d.%d", + split[0], split[1], split[2], split[3] + ); + return 0; +} + +/* */ +static uint32_t +str_to_addr(const char *addr) +{ + uint32_t split[4]; + uint32_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); +} + +/* */ +static int +addr_list_fprint(char **h_addr_list, FILE *dst) +{ + int i; + char *addr_string = (h_addr_list[1]) + ? "Addresses" + : "Address"; + + fprintf(dst, "%s: ", addr_string); + for (i = 0; h_addr_list[i]; i++) { + addr_fprint(h_addr_list[i], dst); + if (h_addr_list[i+1]) { + fprintf(dst, ", "); + } + } + fprintf(dst,"\n"); + return 0; +} + +/* */ +static struct hostent * +lookup_by_name(const char *hostname) +{ + struct hostent *host; + + host = gethostbyname(hostname); + if (host) { + fprintf(stdout, "Name: %s\n", host->h_name); + addr_list_fprint(host->h_addr_list, stdout); + } else { + herror("crap"); + } + return host; +} + +/* */ +static struct hostent * +lookup_by_addr(const char *addr) +{ + struct hostent *host; + + host = gethostbyaddr(addr, 4, AF_INET); /* IPv4 only for now */ + if (host) { + fprintf(stdout, "Name: %s\n", host->h_name); + addr_list_fprint(host->h_addr_list, stdout); + } else { + herror("crap"); + } + return host; +} + +/* */ +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 in_addr addr; + + server_fprint(stdout); + if (is_ip_address(argv[1])) { + addr.s_addr = str_to_addr(argv[1]); + lookup_by_addr((char *) &addr); + } else { + lookup_by_name(argv[1]); + } + return 0; +} + +/* $Id: nslookup.c,v 1.1 2000/01/29 12:59:01 beppu Exp $ */ |