NetBSD/usr.sbin/greconfig/greconfig.c

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/*
* (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 1.5 1999/06/28 07:37:13 explorer Exp $
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <err.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 to %s...\n",
sa2name(sa));
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 to %s...\n",
sa2name(sa));
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)
{
fprintf(stderr,
"greconfig -i unit [-d dst] [-s src] [-p proto] [-v]\n");
fprintf(stderr, "unit is gre<n>, proto either 47 or 55\n");
}
void
name2sa(char *name, struct sockaddr **sa)
{
struct hostent *hp;
struct sockaddr_in *si;
static 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)
errx(5, "Only internet addresses allowed, not %s\n", name);
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));
}