+++ /dev/null
-// $Id: ifspec.c 965 2004-02-20 16:59:40Z ensc $
-
-// Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
-// based on ifspec.cc by Jacques Gelinas
-//
-// 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, 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.
-
-/*
- Prints the specs of a network device in shell like form
-
- ADDR=
- NETMASK=
- BCAST=
-*/
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-#include <unistd.h>
-#include <sys/socket.h>
-#include <sys/ioctl.h>
-#include <netinet/in.h>
-#include <net/if.h>
-
-static void usage()
-{
- fprintf (stderr,"ifspec version %s\n",VERSION);
- fprintf (stderr
- ,"ifspec network-device [ ipaddr netmask broadcast ]\n"
- "prints device specification in a shell usable way\n");
- exit (-1);
-}
-
-static int ifconfig_ioctl(
- int fd,
- const char *ifname,
- int cmd,
- struct ifreq *ifr)
-{
- strcpy(ifr->ifr_name, ifname);
- return ioctl(fd, cmd,ifr);
-}
-
-static unsigned long ip_cnv (const char *str)
-{
- const char *start_str = str;
- unsigned tb[4];
- int no = 0;
- unsigned long ret;
-
- memset (tb,-1,sizeof(tb));
- while (*str != '\0' && no < 4){
- if (isdigit(*str)){
- int val = atoi(str);
- if (val > 255) break;
- tb[no++] = val;
- while (isdigit(*str)) str++;
- if (*str == '.'){
- str++;
- }else{
- break;
- }
- }else{
- break;
- }
- }
-
- ret = (tb[0] << 24) | (tb[1]<<16) | (tb[2] << 8) | tb[3];
- if (no != 4 || *str != '\0'){
- fprintf (stderr,"Invalid IP number or netmask: %s\n",start_str);
- ret = 0xffffffff;
- }
- return ret;
-}
-
-
-/*
- Fetch the IP number of an interface from the kernel.
- Assume the device is already available in the kernel
- Return -1 if any error.
-*/
-int ifconfig_print (
- const char *ifname,
- const char *addrstr,
- const char *maskstr,
- const char *bcaststr)
-{
- int ret = -1;
- int skfd = socket(AF_INET, SOCK_DGRAM, 0);
- if (skfd != -1){
- struct ifreq ifr;
- struct {
- unsigned long addr;
- unsigned long mask;
- } solved = {0,0};
- if (addrstr != NULL && addrstr[0] != '\0'){
- printf ("ADDR=%s\n",addrstr);
- solved.addr = ip_cnv (addrstr);
- }else if (ifconfig_ioctl(skfd,ifname,SIOCGIFADDR, &ifr) >= 0){
- struct sockaddr_in *sin = (struct sockaddr_in*)&ifr.ifr_addr;
- unsigned long addr = ntohl(sin->sin_addr.s_addr);
- printf ("ADDR=%lu.%lu.%lu.%lu\n"
- ,(addr>>24)&0xff
- ,(addr>>16)&0xff
- ,(addr>>8)&0xff
- ,addr&0xff);
- solved.addr = addr;
- ret = 0;
- }
- else {
- perror("ifspec: ioctl(SIOCGIFADDR)");
- }
-
- if (maskstr != NULL && maskstr[0] != '\0'){
- printf ("NETMASK=%s\n",maskstr);
- solved.mask = ip_cnv (maskstr);
- }else if (ifconfig_ioctl(skfd,ifname,SIOCGIFNETMASK, &ifr) >= 0){
- struct sockaddr_in *sin = (struct sockaddr_in*)&ifr.ifr_addr;
- unsigned long addr = ntohl(sin->sin_addr.s_addr);
- printf ("NETMASK=%lu.%lu.%lu.%lu\n"
- ,(addr>>24)&0xff
- ,(addr>>16)&0xff
- ,(addr>>8)&0xff
- ,addr&0xff);
- solved.mask = addr;
- ret = 0;
- }
- else {
- perror("ifspec: ioctl(SIOCGIFNETMASK)");
- }
-
- if (bcaststr != NULL && bcaststr[0] != '\0'){
- printf ("BCAST=%s\n",bcaststr);
- }else if (ifconfig_ioctl(skfd,ifname,SIOCGIFBRDADDR, &ifr) >= 0){
- struct sockaddr_in *sin = (struct sockaddr_in*)&ifr.ifr_addr;
- unsigned long addr = ntohl(sin->sin_addr.s_addr);
- printf ("BCAST=%lu.%lu.%lu.%lu\n"
- ,(addr>>24)&0xff
- ,(addr>>16)&0xff
- ,(addr>>8)&0xff
- ,addr&0xff);
- ret = 0;
- }else if (solved.addr!=0 && solved.mask!=0) {
- // Can't get it from the kernel, compute it from the IP
- // and the netmask
- unsigned long addr = (solved.addr & solved.mask)
- | ~solved.mask;
- printf ("BCAST=%lu.%lu.%lu.%lu\n"
- ,(addr>>24)&0xff
- ,(addr>>16)&0xff
- ,(addr>>8)&0xff
- ,addr&0xff);
-
- }
- close (skfd);
- }
- return ret;
-}
-
-
-int main (int argc, char *argv[])
-{
- int ret = -1;
- if (argc < 2){
- usage();
- }else{
- const char *addrstr = argc >= 3 ? argv[2] : NULL;
- const char *maskstr = argc >= 4 ? argv[3] : NULL;
- const char *bcaststr = argc >= 5 ? argv[4] : NULL;
- ret = ifconfig_print (argv[1],addrstr,maskstr,bcaststr);
- }
- return ret;
-}
-
-
-
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