4.3BSD/usr/src/etc/ifconfig.c
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint
#ifndef lint
static char sccsid[] = "@(#)ifconfig.c 4.18 (Berkeley) 5/22/86";
#endif not lint
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#define NSIP
#include <netns/ns.h>
#include <netns/ns_if.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <netdb.h>
extern int errno;
struct ifreq ifr;
struct sockaddr_in sin = { AF_INET };
struct sockaddr_in broadaddr;
struct sockaddr_in netmask = { AF_INET };
struct sockaddr_in ipdst = { AF_INET };
char name[30];
int flags;
int metric;
int setaddr;
int setmask;
int setbroadaddr;
int setipdst;
int s;
extern int errno;
int setifflags(), setifaddr(), setifdstaddr(), setifnetmask();
int setifmetric(), setifbroadaddr(), setifipdst();
#define NEXTARG 0xffffff
struct cmd {
char *c_name;
int c_parameter; /* NEXTARG means next argv */
int (*c_func)();
} cmds[] = {
{ "up", IFF_UP, setifflags } ,
{ "down", -IFF_UP, setifflags },
{ "trailers", -IFF_NOTRAILERS,setifflags },
{ "-trailers", IFF_NOTRAILERS, setifflags },
{ "arp", -IFF_NOARP, setifflags },
{ "-arp", IFF_NOARP, setifflags },
{ "debug", IFF_DEBUG, setifflags },
{ "-debug", -IFF_DEBUG, setifflags },
#ifdef notdef
#define EN_SWABIPS 0x1000
{ "swabips", EN_SWABIPS, setifflags },
{ "-swabips", -EN_SWABIPS, setifflags },
#endif
{ "netmask", NEXTARG, setifnetmask },
{ "metric", NEXTARG, setifmetric },
{ "broadcast", NEXTARG, setifbroadaddr },
{ "ipdst", NEXTARG, setifipdst },
{ 0, 0, setifaddr },
{ 0, 0, setifdstaddr },
};
/*
* XNS support liberally adapted from
* code written at the University of Maryland
* principally by James O'Toole and Chris Torek.
*/
int in_status(), in_getaddr();
int xns_status(), xns_getaddr();
/* Known address families */
struct afswtch {
char *af_name;
short af_af;
int (*af_status)();
int (*af_getaddr)();
} afs[] = {
{ "inet", AF_INET, in_status, in_getaddr },
{ "ns", AF_NS, xns_status, xns_getaddr },
{ 0, 0, 0, 0 }
};
struct afswtch *afp; /*the address family being set or asked about*/
main(argc, argv)
int argc;
char *argv[];
{
int af = AF_INET;
if (argc < 2) {
fprintf(stderr, "usage: ifconfig interface\n%s%s%s%s",
"\t[ af [ address [ dest_addr ] ] [ up ] [ down ]",
"[ netmask mask ] ]\n",
"\t[ metric n ]\n",
"\t[ trailers | -trailers ]\n",
"\t[ arp | -arp ]\n");
exit(1);
}
argc--, argv++;
strncpy(name, *argv, sizeof(name));
strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
argc--, argv++;
if (argc > 0) {
struct afswtch *myafp;
for (myafp = afp = afs; myafp->af_name; myafp++)
if (strcmp(myafp->af_name, *argv) == 0) {
afp = myafp; argc--; argv++;
break;
}
af = ifr.ifr_addr.sa_family = afp->af_af;
}
s = socket(af, SOCK_DGRAM, 0);
if (s < 0) {
perror("ifconfig: socket");
exit(1);
}
if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
Perror("ioctl (SIOCGIFFLAGS)");
exit(1);
}
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
flags = ifr.ifr_flags;
if (ioctl(s, SIOCGIFMETRIC, (caddr_t)&ifr) < 0)
perror("ioctl (SIOCGIFMETRIC)");
else
metric = ifr.ifr_metric;
if (argc == 0) {
status();
exit(0);
}
while (argc > 0) {
register struct cmd *p;
for (p = cmds; p->c_name; p++)
if (strcmp(*argv, p->c_name) == 0)
break;
if (p->c_name == 0 && setaddr)
p++; /* got src, do dst */
if (p->c_func) {
if (p->c_parameter == NEXTARG) {
(*p->c_func)(argv[1]);
argc--, argv++;
} else
(*p->c_func)(*argv, p->c_parameter);
}
argc--, argv++;
}
if ((setmask || setaddr) && (af == AF_INET)) {
/*
* If setting the address and not the mask,
* clear any existing mask and the kernel will then
* assign the default. If setting both,
* set the mask first, so the address will be
* interpreted correctly.
*/
ifr.ifr_addr = *(struct sockaddr *)&netmask;
if (ioctl(s, SIOCSIFNETMASK, (caddr_t)&ifr) < 0)
Perror("ioctl (SIOCSIFNETMASK)");
}
if (setipdst && af==AF_NS) {
struct nsip_req rq;
int size = sizeof(rq);
rq.rq_ns = *(struct sockaddr *) &sin;
rq.rq_ip = *(struct sockaddr *) &ipdst;
if (setsockopt(s, 0, SO_NSIP_ROUTE, &rq, size) < 0)
Perror("Encapsulation Routing");
setaddr = 0;
}
if (setaddr) {
ifr.ifr_addr = *(struct sockaddr *) &sin;
if (ioctl(s, SIOCSIFADDR, (caddr_t)&ifr) < 0)
Perror("ioctl (SIOCSIFADDR)");
}
if (setbroadaddr) {
ifr.ifr_addr = *(struct sockaddr *)&broadaddr;
if (ioctl(s, SIOCSIFBRDADDR, (caddr_t)&ifr) < 0)
Perror("ioctl (SIOCSIFBRDADDR)");
}
exit(0);
}
/*ARGSUSED*/
setifaddr(addr, param)
char *addr;
short param;
{
/*
* Delay the ioctl to set the interface addr until flags are all set.
* The address interpretation may depend on the flags,
* and the flags may change when the address is set.
*/
setaddr++;
(*afp->af_getaddr)(addr, &sin);
}
setifnetmask(addr)
char *addr;
{
in_getaddr(addr, &netmask);
setmask++;
}
setifbroadaddr(addr)
char *addr;
{
(*afp->af_getaddr)(addr, &broadaddr);
setbroadaddr++;
}
setifipdst(addr)
char *addr;
{
in_getaddr(addr, &ipdst);
setipdst++;
}
/*ARGSUSED*/
setifdstaddr(addr, param)
char *addr;
int param;
{
(*afp->af_getaddr)(addr, &ifr.ifr_addr);
if (ioctl(s, SIOCSIFDSTADDR, (caddr_t)&ifr) < 0)
Perror("ioctl (SIOCSIFDSTADDR)");
}
setifflags(vname, value)
char *vname;
short value;
{
if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
Perror("ioctl (SIOCGIFFLAGS)");
exit(1);
}
strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
flags = ifr.ifr_flags;
if (value < 0) {
value = -value;
flags &= ~value;
} else
flags |= value;
ifr.ifr_flags = flags;
if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
Perror(vname);
}
setifmetric(val)
char *val;
{
strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
ifr.ifr_metric = atoi(val);
if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
perror("ioctl (set metric)");
}
#define IFFBITS \
"\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS\7RUNNING\10NOARP\
"
/*
* Print the status of the interface. If an address family was
* specified, show it and it only; otherwise, show them all.
*/
status()
{
register struct afswtch *p = afp;
short af = ifr.ifr_addr.sa_family;
printf("%s: ", name);
printb("flags", flags, IFFBITS);
if (metric)
printf(" metric %d", metric);
putchar('\n');
if ((p = afp) != NULL) {
(*p->af_status)(1);
} else for (p = afs; p->af_name; p++) {
ifr.ifr_addr.sa_family = p->af_af;
(*p->af_status)(0);
}
}
in_status(force)
int force;
{
struct sockaddr_in *sin;
char *inet_ntoa();
strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
if (!force)
return;
bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
} else
perror("ioctl (SIOCGIFADDR)");
}
sin = (struct sockaddr_in *)&ifr.ifr_addr;
printf("\tinet %s ", inet_ntoa(sin->sin_addr));
strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
if (ioctl(s, SIOCGIFNETMASK, (caddr_t)&ifr) < 0) {
if (errno != EADDRNOTAVAIL)
perror("ioctl (SIOCGIFNETMASK)");
bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
} else
netmask.sin_addr =
((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
if (flags & IFF_POINTOPOINT) {
if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
if (errno == EADDRNOTAVAIL)
bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
else
perror("ioctl (SIOCGIFDSTADDR)");
}
strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
printf("--> %s ", inet_ntoa(sin->sin_addr));
}
printf("netmask %x ", ntohl(netmask.sin_addr.s_addr));
if (flags & IFF_BROADCAST) {
if (ioctl(s, SIOCGIFBRDADDR, (caddr_t)&ifr) < 0) {
if (errno == EADDRNOTAVAIL)
bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
else
perror("ioctl (SIOCGIFADDR)");
}
strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
sin = (struct sockaddr_in *)&ifr.ifr_addr;
if (sin->sin_addr.s_addr != 0)
printf("broadcast %s", inet_ntoa(sin->sin_addr));
}
putchar('\n');
}
xns_status(force)
int force;
{
struct sockaddr_ns *sns;
close(s);
s = socket(AF_NS, SOCK_DGRAM, 0);
if (s < 0) {
if (errno == EAFNOSUPPORT)
return;
perror("ifconfig: socket");
exit(1);
}
if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
if (!force)
return;
bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
} else
perror("ioctl (SIOCGIFADDR)");
}
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
sns = (struct sockaddr_ns *)&ifr.ifr_addr;
printf("\tns %s ", ns_ntoa(sns->sns_addr));
if (flags & IFF_POINTOPOINT) { /* by W. Nesheim@Cornell */
if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
if (errno == EADDRNOTAVAIL)
bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
else
Perror("ioctl (SIOCGIFDSTADDR)");
}
strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
sns = (struct sockaddr_ns *)&ifr.ifr_dstaddr;
printf("--> %s ", ns_ntoa(sns->sns_addr));
}
putchar('\n');
}
Perror(cmd)
char *cmd;
{
extern int errno;
fprintf(stderr, "ifconfig: ");
switch (errno) {
case ENXIO:
fprintf(stderr, "%s: no such interface\n", cmd);
break;
case EPERM:
fprintf(stderr, "%s: permission denied\n", cmd);
break;
default:
perror(cmd);
}
exit(1);
}
struct in_addr inet_makeaddr();
in_getaddr(s, saddr)
char *s;
struct sockaddr *saddr;
{
register struct sockaddr_in *sin = (struct sockaddr_in *)saddr;
struct hostent *hp;
struct netent *np;
int val;
sin->sin_family = AF_INET;
val = inet_addr(s);
if (val != -1) {
sin->sin_addr.s_addr = val;
return;
}
hp = gethostbyname(s);
if (hp) {
sin->sin_family = hp->h_addrtype;
bcopy(hp->h_addr, (char *)&sin->sin_addr, hp->h_length);
return;
}
np = getnetbyname(s);
if (np) {
sin->sin_family = np->n_addrtype;
sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
return;
}
fprintf(stderr, "%s: bad value\n", s);
exit(1);
}
/*
* Print a value a la the %b format of the kernel's printf
*/
printb(s, v, bits)
char *s;
register char *bits;
register unsigned short v;
{
register int i, any = 0;
register char c;
if (bits && *bits == 8)
printf("%s=%o", s, v);
else
printf("%s=%x", s, v);
bits++;
if (bits) {
putchar('<');
while (i = *bits++) {
if (v & (1 << (i-1))) {
if (any)
putchar(',');
any = 1;
for (; (c = *bits) > 32; bits++)
putchar(c);
} else
for (; *bits > 32; bits++)
;
}
putchar('>');
}
}
xns_getaddr(addr, saddr)
char *addr;
struct sockaddr *saddr;
{
struct sockaddr_ns *sns = (struct sockaddr_ns *)saddr;
struct ns_addr ns_addr();
sns->sns_family = AF_NS;
sns->sns_addr = ns_addr(addr);
}