NetBSD/usr.sbin/greconfig/greconfig.c

201 lines
5.3 KiB
C

/*
* (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Heiko W.Rupp <hwr@pilhuhn.de>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* greconfig - frontend to set/query tunnel endpoints
*
* $NetBSD: greconfig.c,v 1.4 1999/01/26 21:32:40 hwr Exp $
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/sockio.h>
#include <netdb.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
/* from sys/sockio.h */
#define GRESADDRS _IOW('i', 101, struct ifreq)
#define GRESADDRD _IOW('i', 102, struct ifreq)
#define GREGADDRS _IOWR('i', 103, struct ifreq)
#define GREGADDRD _IOWR('i', 104, struct ifreq)
#define GRESPROTO _IOW('i' , 105, struct ifreq)
#define GREGPROTO _IOWR('i', 106, struct ifreq)
void usage(void);
void name2sa(char *name,struct sockaddr **sa);
char* sa2name(struct sockaddr *sa);
int verbose;
int
main(int argc, char **argv)
{
int i,s,err;
char *dst,*src,*inf;
struct ifreq ifr;
struct sockaddr *sa;
int pflag=0;
u_char proto = 47;
dst=src=inf=NULL;
verbose=0;
while ((i = getopt(argc, argv, "d:i:p:s:v")) != -1)
switch(i) {
case 'd': dst=optarg; break;
case 'i': inf=optarg; break;
case 'p': proto=atoi(optarg); pflag++; break;
case 's': src=optarg; break;
case 'v': verbose++; break;
default: usage(); exit(1);
}
if (inf==NULL) {
usage();
exit(2);
}
if (strncmp("gre",inf,3)!=0) {
usage();
exit(3);
}
if((proto!=47) && (proto!=55)) {
usage();
exit(4);
}
s=socket(PF_INET,SOCK_DGRAM,0);
if(s<0) {
perror("Socket() failed: \n");
exit(5);
}
if (pflag) { /* IPPROTO_GRE is default in kernel */
strncpy(ifr.ifr_name,inf,sizeof(ifr.ifr_name));
ifr.ifr_flags = proto;
if (verbose)
printf("Setting tunnel protocol to proto %d\n",proto);
err=ioctl(s,GRESPROTO,(caddr_t)&ifr);
if(err<0)
perror("GRESPROTO");
}
if (src!=NULL) {
strncpy(ifr.ifr_name,inf,sizeof(ifr.ifr_name));
name2sa(src,&sa);
ifr.ifr_addr=*sa;
if(verbose)
printf("Setting source address ...\n");
err=ioctl(s,GRESADDRS,(caddr_t)&ifr);
if(err<0)
perror("GRESADDRS");
}
if (dst!=NULL) {
strncpy(ifr.ifr_name,inf,sizeof(ifr.ifr_name));
name2sa(dst,&sa);
ifr.ifr_addr=*sa;
if(verbose)
printf("Setting destination address ...\n");
err=ioctl(s,GRESADDRD,(caddr_t)&ifr);
if(err<0)
perror("GRESADDRD");
}
if (src==NULL && dst==NULL && !pflag) {
strncpy(ifr.ifr_name,inf,sizeof(ifr.ifr_name));
err=ioctl(s,GREGADDRS,(caddr_t)&ifr);
if(err<0)
perror("GREGADDRS");
else
printf("%s -> ",sa2name(&ifr.ifr_addr));
strncpy(ifr.ifr_name,inf,sizeof(ifr.ifr_name));
err=ioctl(s,GREGADDRD,(caddr_t)&ifr);
if(err<0)
perror("GREGADDRD");
else
printf("%s, ",sa2name(&ifr.ifr_addr));
err=ioctl(s,GREGPROTO,(caddr_t)&ifr);
if(err<0)
perror("GREGPROTO");
else
printf("running IP-Proto %d\n",ifr.ifr_flags);
}
close(s);
exit(0);
}
void
usage(void)
{
printf("greconfig -i unit [-d dst] [-s src] [-p proto] [-v]\n");
printf("unit is gre<n>, proto either 47 or 55\n");
}
void name2sa(char *name,struct sockaddr **sa)
{
struct hostent *hp;
struct sockaddr_in *si;
struct sockaddr_in s;
hp=gethostbyname(name);
bzero(&s,sizeof(struct sockaddr_in));
s.sin_family=hp->h_addrtype;
if(hp->h_addrtype != AF_INET) {
printf("Only internet addresses allowed, not %s\n",name);
exit(5);
}
bcopy(hp->h_addr,&s.sin_addr,hp->h_length);
si=&s;
*sa=(struct sockaddr *)si;
}
char* sa2name(struct sockaddr *sa)
{
struct sockaddr_in *si;
si=((struct sockaddr_in *)(sa));
return(inet_ntoa(si->sin_addr));
}