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freebsd/usr.sbin/gifconfig/gifconfig.c
Jun-ichiro itojun Hagino 5c2fe5afaa sync with more recent KAME tree. handles scoped IPv6 notation.
supports "delete" subcommand.
corrects PR 19663.
2000-07-05 08:42:07 +00:00

892 lines
20 KiB
C

/* $FreeBSD$ */
/* $KAME: gifconfig.c,v 1.12 2000/05/22 05:50:43 itojun Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* 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 University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*/
/*
* gifconfig, derived from ifconfig
*
* @(#) Copyright (c) 1983, 1993\n\
* The Regents of the University of California. All rights reserved.\n
*
* @(#)ifconfig.c 8.2 (Berkeley) 2/16/94
*/
/*
* 951109 - Andrew@pubnix.net - Changed to iterative buffer growing mechanism
* for ifconfig -a so all interfaces are queried.
*
* 960101 - peter@freebsd.org - Blow away the SIOCGIFCONF code and use
* sysctl() to get the structured interface conf
* and parse the messages in there. REALLY UGLY!
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <net/if.h>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include <net/if_var.h>
#endif /* __FreeBSD__ >= 3 */
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/protosw.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>
#include <fcntl.h>
struct ifreq ifr;
struct ifaliasreq addreq;
#ifdef INET6
struct in6_ifreq in6_ifr;
struct in6_aliasreq in6_addreq;
#endif
char name[32];
int flags;
int metric;
int mtu;
int setpsrc = 0;
int newaddr = 0;
int s;
kvm_t *kvmd;
#ifdef INET6
char ntop_buf[INET6_ADDRSTRLEN]; /*inet_ntop()*/
#endif
void setifpsrc __P((char *, int));
void setifpdst __P((char *, int));
void setifflags __P((char *, int));
#ifdef SIOCDIFPHYADDR
void delifaddrs __P((char *, int));
#endif
#define NEXTARG 0xffffff
struct cmd {
char *c_name;
int c_parameter; /* NEXTARG means next argv */
void (*c_func) __P((char *, int));
} cmds[] = {
{ "up", IFF_UP, setifflags } ,
{ "down", -IFF_UP, setifflags },
#ifdef SIOCDIFPHYADDR
{ "delete", 0, delifaddrs },
#endif
{ 0, 0, setifpsrc },
{ 0, 0, setifpdst },
};
/*
* XNS support liberally adapted from code written at the University of
* Maryland principally by James O'Toole and Chris Torek.
*/
int main __P((int, char *[]));
void status __P((void));
void phys_status __P((int));
void in_status __P((int));
#ifdef INET6
void in6_status __P((int));
#endif
void ether_status __P((int));
void Perror __P((char *));
void in_getaddr __P((char *, int));
#ifdef INET6
void in6_getaddr __P((char *, int));
void in6_getprefix __P((char *, int));
#endif
void printb __P((char *, unsigned int, char *));
int prefix __P((void *, int));
char ntop_buf[INET6_ADDRSTRLEN];
/* Known address families */
struct afswtch {
char *af_name;
short af_af;
void (*af_status) __P((int));
void (*af_getaddr) __P((char *, int));
void (*af_getprefix) __P((char *, int));
u_long af_pifaddr;
caddr_t af_addreq;
caddr_t af_req;
} afs[] = {
#define C(x) ((caddr_t) &x)
{ "inet", AF_INET, in_status, in_getaddr, 0,
SIOCSIFPHYADDR, C(addreq), C(ifr) },
#ifdef INET6
{ "inet6", AF_INET6, in6_status, in6_getaddr, in6_getprefix,
SIOCSIFPHYADDR_IN6, C(in6_addreq), C(in6_ifr) },
#endif
{ "ether", AF_INET, ether_status, NULL, NULL }, /* XXX not real!! */
{ 0, 0, 0, 0, 0 }
};
struct afswtch *afp = NULL; /*the address family being set or asked about*/
void rt_xaddrs __P((caddr_t, caddr_t, struct rt_addrinfo *));
int ifconfig __P((int argc, char *argv[], int af, struct afswtch *rafp));
/*
* Expand the compacted form of addresses as returned via the
* configuration read via sysctl().
*/
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
void
rt_xaddrs(cp, cplim, rtinfo)
caddr_t cp, cplim;
struct rt_addrinfo *rtinfo;
{
struct sockaddr *sa;
int i;
memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info));
for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
if ((rtinfo->rti_addrs & (1 << i)) == 0)
continue;
rtinfo->rti_info[i] = sa = (struct sockaddr *)cp;
ADVANCE(cp, sa);
}
}
/*
* Grunge for new-style sysctl() decoding.. :-(
* Apologies to the world for committing gross things like this in 1996..
*/
struct if_msghdr *ifm;
struct ifa_msghdr *ifam;
struct sockaddr_dl *sdl;
struct rt_addrinfo info;
char *buf, *lim, *next;
int
main(argc, argv)
int argc;
char *argv[];
{
int af = AF_INET;
struct afswtch *rafp = NULL;
size_t needed;
int mib[6];
int all;
if (argc < 2) {
fprintf(stderr,
"usage: gifconfig interface [af] [physsrc physdst]\n");
#ifdef SIOCDIFPHYADDR
fprintf(stderr,
" gifconfig interface delete\n");
#endif
fprintf(stderr,
" gifconfig -a\n");
exit(1);
}
argc--, argv++;
strncpy(name, *argv, sizeof(name));
strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
argc--, argv++;
if (argc > 0) {
for (afp = rafp = afs; rafp->af_name; rafp++)
if (strcmp(rafp->af_name, *argv) == 0) {
afp = rafp; argc--; argv++;
break;
}
rafp = afp;
af = ifr.ifr_addr.sa_family = rafp->af_af;
}
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0; /* address family */
mib[4] = NET_RT_IFLIST;
mib[5] = 0;
/* if particular family specified, only ask about it */
if (afp) {
mib[3] = afp->af_af;
}
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
errx(1, "iflist-sysctl-estimate");
if ((buf = malloc(needed)) == NULL)
errx(1, "malloc");
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
errx(1, "actual retrieval of interface table");
lim = buf + needed;
all = 0;
if (strcmp(name, "-a") == 0)
all = 1; /* All interfaces */
else if (strcmp(name, "-au") == 0)
all = 2; /* All IFF_UPinterfaces */
else if (strcmp(name, "-ad") == 0)
all = 3; /* All !IFF_UP interfaces */
for (next = buf; next < lim; next += ifm->ifm_msglen) {
ifm = (struct if_msghdr *)next;
/* XXX: Swallow up leftover NEWADDR messages */
if (ifm->ifm_type == RTM_NEWADDR)
continue;
if (ifm->ifm_type == RTM_IFINFO) {
sdl = (struct sockaddr_dl *)(ifm + 1);
flags = ifm->ifm_flags;
} else {
errx(1, "out of sync parsing NET_RT_IFLIST");
}
switch(all) {
case -1:
case 0:
if (strlen(name) != sdl->sdl_nlen)
continue; /* not same len */
if (strncmp(name, sdl->sdl_data, sdl->sdl_nlen) != 0)
continue; /* not same name */
break;
case 1:
break; /* always do it */
case 2:
if ((flags & IFF_UP) == 0)
continue; /* not up */
break;
case 3:
if (flags & IFF_UP)
continue; /* not down */
break;
}
/*
* Let's just do it for gif only
*/
if (sdl->sdl_type != IFT_GIF) {
if (all != 0)
continue;
fprintf(stderr, "gifconfig: %s is not gif.\n",
ifr.ifr_name);
exit(1);
}
if (all > 0) {
strncpy(name, sdl->sdl_data, sdl->sdl_nlen);
name[sdl->sdl_nlen] = '\0';
}
if ((s = socket(af, SOCK_DGRAM, 0)) < 0) {
perror("gifconfig: socket");
exit(1);
}
ifconfig(argc,argv,af,rafp);
close(s);
if (all == 0) {
all = -1; /* flag it as 'done' */
break;
}
}
free(buf);
if (all == 0)
errx(1, "interface %s does not exist", name);
exit (0);
}
int
ifconfig(argc, argv, af, rafp)
int argc;
char *argv[];
int af;
struct afswtch *rafp;
{
af = 0; /*fool gcc*/
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
#ifdef INET6
strncpy(in6_ifr.ifr_name, name, sizeof in6_ifr.ifr_name);
#endif /* INET6 */
if (ioctl(s, SIOCGIFMETRIC, (caddr_t)&ifr) < 0)
perror("ioctl (SIOCGIFMETRIC)");
else
metric = ifr.ifr_metric;
#if defined(SIOCGIFMTU) && !defined(__OpenBSD__)
if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0)
perror("ioctl (SIOCGIFMTU)");
else
mtu = ifr.ifr_mtu;
#else
mtu = 0;
#endif
if (argc == 0) {
status();
return(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 && setpsrc)
p++; /* got src, do dst */
if (p->c_func) {
if (p->c_parameter == NEXTARG) {
if (argv[1] == NULL)
errx(1, "'%s' requires argument",
p->c_name);
(*p->c_func)(argv[1], 0);
argc--, argv++;
} else
(*p->c_func)(*argv, p->c_parameter);
}
argc--, argv++;
}
if (newaddr) {
strncpy(rafp->af_addreq, name, sizeof ifr.ifr_name);
if (ioctl(s, rafp->af_pifaddr, rafp->af_addreq) < 0)
Perror("ioctl (SIOCSIFPHYADDR)");
}
else if (setpsrc) {
errx(1, "destination is not specified");
}
return(0);
}
#define PSRC 0
#define PDST 1
/*ARGSUSED*/
void
setifpsrc(addr, param)
char *addr;
int param;
{
param = 0; /*fool gcc*/
(*afp->af_getaddr)(addr, PSRC);
setpsrc = 1;
}
/*ARGSUSED*/
void
setifpdst(addr, param)
char *addr;
int param;
{
param = 0; /*fool gcc*/
(*afp->af_getaddr)(addr, PDST);
newaddr = 1;
}
void
setifflags(vname, value)
char *vname;
int 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);
}
#ifdef SIOCDIFPHYADDR
/* ARGSUSED */
void
delifaddrs(vname, param)
char *vname;
int param;
{
param = 0; /* fool gcc */
vname = NULL; /* ditto */
if (ioctl(s, SIOCDIFPHYADDR, (caddr_t)&ifr) < 0)
err(1, "ioctl(SIOCDIFPHYADDR)");
}
#endif
#define IFFBITS \
"\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS\7RUNNING\10NOARP\
\11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LINK0\16LINK1\17LINK2\20MULTICAST"
/*
* Print the status of the interface. If an address family was
* specified, show it and it only; otherwise, show them all.
*/
void
status()
{
struct afswtch *p = NULL;
char *mynext;
struct if_msghdr *myifm;
printf("%s: ", name);
printb("flags", flags, IFFBITS);
if (metric)
printf(" metric %d", metric);
if (mtu)
printf(" mtu %d", mtu);
putchar('\n');
/*
* XXX: Sigh. This is bad, I know. At this point, we may have
* *zero* RTM_NEWADDR's, so we have to "feel the water" before
* incrementing the loop. One day, I might feel inspired enough
* to get the top level loop to pass a count down here so we
* dont have to mess with this. -Peter
*/
myifm = ifm;
while (1) {
mynext = next + ifm->ifm_msglen;
if (mynext >= lim)
break;
myifm = (struct if_msghdr *)mynext;
if (myifm->ifm_type != RTM_NEWADDR)
break;
next = mynext;
ifm = (struct if_msghdr *)next;
ifam = (struct ifa_msghdr *)myifm;
info.rti_addrs = ifam->ifam_addrs;
/* Expand the compacted addresses */
rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam,
&info);
if (afp) {
if (afp->af_af == info.rti_info[RTAX_IFA]->sa_family &&
afp->af_status != ether_status) {
p = afp;
if (p->af_status != ether_status)
(*p->af_status)(1);
}
} else for (p = afs; p->af_name; p++) {
if (p->af_af == info.rti_info[RTAX_IFA]->sa_family &&
p->af_status != ether_status)
(*p->af_status)(0);
}
}
if (afp == NULL || afp->af_status == ether_status)
ether_status(0);
else if (afp && !p) {
warnx("%s has no %s IFA address!", name, afp->af_name);
}
phys_status(0);
}
void
phys_status(force)
int force;
{
char psrcaddr[256];
char pdstaddr[256];
char hostname[NI_MAXHOST];
u_long srccmd, dstcmd;
int flags = NI_NUMERICHOST;
struct ifreq *ifrp;
char *ver = "";
#ifdef INET6
int s6;
#endif
force = 0; /*fool gcc*/
psrcaddr[0] = pdstaddr[0] = '\0';
#ifdef INET6
s6 = socket(AF_INET6, SOCK_DGRAM, 0);
if (s6 < 0) {
ifrp = &ifr;
srccmd = SIOCGIFPSRCADDR;
dstcmd = SIOCGIFPDSTADDR;
} else {
close(s6);
srccmd = SIOCGIFPSRCADDR_IN6;
dstcmd = SIOCGIFPDSTADDR_IN6;
ifrp = (struct ifreq *)&in6_ifr;
}
#else /* INET6 */
ifrp = &ifr;
srccmd = SIOCGIFPSRCADDR;
dstcmd = SIOCGIFPDSTADDR;
#endif /* INET6 */
if (0 <= ioctl(s, srccmd, (caddr_t)ifrp)) {
getnameinfo(&ifrp->ifr_addr, ifrp->ifr_addr.sa_len,
hostname, sizeof(hostname), 0, 0, flags);
#ifdef INET6
if (ifrp->ifr_addr.sa_family == AF_INET6)
ver = "6";
#endif /* INET6 */
sprintf(psrcaddr, "inet%s %s", ver, hostname);
}
if (0 <= ioctl(s, dstcmd, (caddr_t)ifrp)) {
getnameinfo(&ifrp->ifr_addr, ifrp->ifr_addr.sa_len,
hostname, sizeof(hostname), 0, 0, flags);
sprintf(pdstaddr, "%s", hostname);
}
printf("\tphysical address %s --> %s\n", psrcaddr, pdstaddr);
}
void
in_status(force)
int force;
{
struct sockaddr_in *sin, null_sin;
#if 0
char *inet_ntoa();
#endif
memset(&null_sin, 0, sizeof(null_sin));
sin = (struct sockaddr_in *)info.rti_info[RTAX_IFA];
if (!sin || sin->sin_family != AF_INET) {
if (!force)
return;
/* warnx("%s has no AF_INET IFA address!", name); */
sin = &null_sin;
}
printf("\tinet %s ", inet_ntoa(sin->sin_addr));
if (flags & IFF_POINTOPOINT) {
/* note RTAX_BRD overlap with IFF_BROADCAST */
sin = (struct sockaddr_in *)info.rti_info[RTAX_BRD];
if (!sin)
sin = &null_sin;
printf("--> %s ", inet_ntoa(sin->sin_addr));
}
sin = (struct sockaddr_in *)info.rti_info[RTAX_NETMASK];
if (!sin)
sin = &null_sin;
printf("netmask 0x%x ", (u_int32_t)ntohl(sin->sin_addr.s_addr));
if (flags & IFF_BROADCAST) {
/* note RTAX_BRD overlap with IFF_POINTOPOINT */
sin = (struct sockaddr_in *)info.rti_info[RTAX_BRD];
if (sin && sin->sin_addr.s_addr != 0)
printf("broadcast %s", inet_ntoa(sin->sin_addr));
}
putchar('\n');
}
#ifdef INET6
void
in6_status(force)
int force;
{
struct sockaddr_in6 *sin, null_sin;
char hostname[NI_MAXHOST];
int niflags = NI_NUMERICHOST;
memset(&null_sin, 0, sizeof(null_sin));
#ifdef NI_WITHSCOPEID
niflags |= NI_WITHSCOPEID;
#endif
sin = (struct sockaddr_in6 *)info.rti_info[RTAX_IFA];
if (!sin || sin->sin6_family != AF_INET6) {
if (!force)
return;
/* warnx("%s has no AF_INET6 IFA address!", name); */
sin = &null_sin;
}
#ifdef __KAME__
if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr)) {
sin->sin6_scope_id =
ntohs(*(u_int16_t *)&sin->sin6_addr.s6_addr[2]);
sin->sin6_addr.s6_addr[2] = 0;
sin->sin6_addr.s6_addr[3] = 0;
}
#endif
getnameinfo((struct sockaddr *)sin, sin->sin6_len,
hostname, sizeof(hostname), 0, 0, niflags);
printf("\tinet6 %s ", hostname);
if (flags & IFF_POINTOPOINT) {
/* note RTAX_BRD overlap with IFF_BROADCAST */
sin = (struct sockaddr_in6 *)info.rti_info[RTAX_BRD];
/*
* some of ther interfaces do not have valid destination
* address.
*/
if (sin->sin6_family == AF_INET6) {
#ifdef __KAME__
if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr)) {
sin->sin6_scope_id =
ntohs(*(u_int16_t *)&sin->sin6_addr.s6_addr[2]);
sin->sin6_addr.s6_addr[2] = 0;
sin->sin6_addr.s6_addr[3] = 0;
}
#endif
getnameinfo((struct sockaddr *)sin, sin->sin6_len,
hostname, sizeof(hostname), 0, 0, niflags);
printf("--> %s ", hostname);
}
}
sin = (struct sockaddr_in6 *)info.rti_info[RTAX_NETMASK];
if (!sin)
sin = &null_sin;
printf(" prefixlen %d ", prefix(&sin->sin6_addr,
sizeof(struct in6_addr)));
putchar('\n');
}
#endif /*INET6*/
/*ARGSUSED*/
void
ether_status(dummy)
int dummy;
{
char *cp;
int n;
dummy = 0; /*fool gcc*/
cp = (char *)LLADDR(sdl);
if ((n = sdl->sdl_alen) > 0) {
if (sdl->sdl_type == IFT_ETHER)
printf ("\tether ");
else
printf ("\tlladdr ");
while (--n >= 0)
printf("%02x%c",*cp++ & 0xff, n>0? ':' : ' ');
putchar('\n');
}
}
void
Perror(cmd)
char *cmd;
{
switch (errno) {
case ENXIO:
errx(1, "%s: no such interface", cmd);
break;
case EPERM:
errx(1, "%s: permission denied", cmd);
break;
default:
err(1, "%s", cmd);
}
}
#define SIN(x) ((struct sockaddr_in *) &(x))
struct sockaddr_in *sintab[] = {
SIN(addreq.ifra_addr), SIN(addreq.ifra_dstaddr)};
void
in_getaddr(s, which)
char *s;
int which;
{
register struct sockaddr_in *sin = sintab[which];
struct hostent *hp;
struct netent *np;
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
if (inet_aton(s, &sin->sin_addr))
;
else if ((hp = gethostbyname(s)) != NULL)
bcopy(hp->h_addr, (char *)&sin->sin_addr, hp->h_length);
else if ((np = getnetbyname(s)) != NULL)
sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
else
errx(1, "%s: bad value", s);
}
#ifdef INET6
#define SIN6(x) ((struct sockaddr_in6 *) &(x))
struct sockaddr_in6 *sin6tab[] = {
SIN6(in6_addreq.ifra_addr), SIN6(in6_addreq.ifra_dstaddr)};
void
in6_getaddr(s, which)
char *s;
int which;
{
register struct sockaddr_in6 *sin = sin6tab[which];
sin->sin6_len = sizeof(*sin);
sin->sin6_family = AF_INET6;
if (inet_pton(AF_INET6, s, &sin->sin6_addr) != 1)
errx(1, "%s: bad value", s);
}
void
in6_getprefix(plen, which)
char *plen;
int which;
{
register struct sockaddr_in6 *sin = sin6tab[which];
register u_char *cp;
int len = atoi(plen);
if ((len < 0) || (len > 128))
errx(1, "%s: bad value", plen);
sin->sin6_len = sizeof(*sin);
sin->sin6_family = AF_INET6;
if ((len == 0) || (len == 128)) {
memset(&sin->sin6_addr, -1, sizeof(struct in6_addr));
return;
}
for (cp = (u_char *)&sin->sin6_addr; len > 7; len -= 8)
*cp++ = -1;
*cp = (-1) << (8 - len);
}
#endif
/*
* Print a value a la the %b format of the kernel's printf
*/
void
printb(s, v, bits)
char *s;
register unsigned int v;
register char *bits;
{
register int i, any = 0;
register char c;
if (bits && *bits == 8)
printf("%s=%o", s, v & 0xffff);
else
printf("%s=%x", s, v & 0xffff);
bits++;
if (bits) {
putchar('<');
while ((i = *bits++) != 0) {
if ((v & (1 << (i-1))) != 0) {
if (any)
putchar(',');
any = 1;
for (; (c = *bits) > 32; bits++)
putchar(c);
} else
for (; *bits > 32; bits++)
;
}
putchar('>');
}
}
#ifdef INET6
int
prefix(val, size)
void *val;
int size;
{
register u_char *name = (u_char *)val;
register int byte, bit, plen = 0;
for (byte = 0; byte < size; byte++, plen += 8)
if (name[byte] != 0xff)
break;
if (byte == size)
return (plen);
for (bit = 7; bit != 0; bit--, plen++)
if (!(name[byte] & (1 << bit)))
break;
for (; bit != 0; bit--)
if (name[byte] & (1 << bit))
return(0);
byte++;
for (; byte < size; byte++)
if (name[byte])
return(0);
return (plen);
}
#endif /*INET6*/