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freebsd-skq/sbin/route/route.c
brian 016b1a255a Handle snprintf() returning -1. 
MFC after:	2 weeks
2001-08-20 12:56:45 +00:00

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/*
* Copyright (c) 1983, 1989, 1991, 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.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1989, 1991, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)route.c 8.3 (Berkeley) 3/19/94";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netatalk/at.h>
#ifdef NS
#include <netns/ns.h>
#endif
#include <arpa/inet.h>
#include <netdb.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <ifaddrs.h>
struct keytab {
char *kt_cp;
int kt_i;
} keywords[] = {
#include "keywords.h"
{0, 0}
};
struct ortentry route;
union sockunion {
struct sockaddr sa;
struct sockaddr_in sin;
#ifdef INET6
struct sockaddr_in6 sin6;
#endif
struct sockaddr_at sat;
#ifdef NS
struct sockaddr_ns sns;
#endif
struct sockaddr_dl sdl;
struct sockaddr_inarp sinarp;
struct sockaddr_storage ss; /* added to avoid memory overrun */
} so_dst, so_gate, so_mask, so_genmask, so_ifa, so_ifp;
typedef union sockunion *sup;
int pid, rtm_addrs, uid;
int s;
int forcehost, forcenet, doflush, nflag, af, qflag, tflag, keyword();
int iflag, verbose, aflen = sizeof (struct sockaddr_in);
int locking, lockrest, debugonly;
struct rt_metrics rt_metrics;
u_long rtm_inits;
int atalk_aton __P((const char *, struct at_addr *));
char *atalk_ntoa __P((struct at_addr));
const char *routename(), *netname();
void flushroutes(), newroute(), monitor(), sockaddr(), sodump(), bprintf();
void print_getmsg(), print_rtmsg(), pmsg_common(), pmsg_addrs(), mask_addr();
int getaddr(), rtmsg(), x25_makemask();
int prefixlen();
extern char *iso_ntoa();
void usage __P((const char *)) __dead2;
void
usage(cp)
const char *cp;
{
if (cp)
warnx("bad keyword: %s", cp);
(void) fprintf(stderr,
"usage: route [-dnqtv] command [[modifiers] args]\n");
exit(EX_USAGE);
/* NOTREACHED */
}
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
int
main(argc, argv)
int argc;
char **argv;
{
int ch;
if (argc < 2)
usage((char *)NULL);
while ((ch = getopt(argc, argv, "nqdtv")) != -1)
switch(ch) {
case 'n':
nflag = 1;
break;
case 'q':
qflag = 1;
break;
case 'v':
verbose = 1;
break;
case 't':
tflag = 1;
break;
case 'd':
debugonly = 1;
break;
case '?':
default:
usage((char *)NULL);
}
argc -= optind;
argv += optind;
pid = getpid();
uid = getuid();
if (tflag)
s = open(_PATH_DEVNULL, O_WRONLY, 0);
else
s = socket(PF_ROUTE, SOCK_RAW, 0);
if (s < 0)
err(EX_OSERR, "socket");
setuid(uid);
if (*argv)
switch (keyword(*argv)) {
case K_GET:
uid = 0;
/* FALLTHROUGH */
case K_CHANGE:
case K_ADD:
case K_DELETE:
newroute(argc, argv);
/* NOTREACHED */
case K_MONITOR:
monitor();
/* NOTREACHED */
case K_FLUSH:
flushroutes(argc, argv);
exit(0);
/* NOTREACHED */
}
usage(*argv);
/* NOTREACHED */
}
/*
* Purge all entries in the routing tables not
* associated with network interfaces.
*/
void
flushroutes(argc, argv)
int argc;
char *argv[];
{
size_t needed;
int mib[6], rlen, seqno;
char *buf, *next, *lim;
register struct rt_msghdr *rtm;
if (uid) {
errx(EX_NOPERM, "must be root to alter routing table");
}
shutdown(s, 0); /* Don't want to read back our messages */
if (argc > 1) {
argv++;
if (argc == 2 && **argv == '-')
switch (keyword(*argv + 1)) {
case K_INET:
af = AF_INET;
break;
#ifdef INET6
case K_INET6:
af = AF_INET6;
break;
#endif
case K_ATALK:
af = AF_APPLETALK;
break;
#ifdef NS
case K_XNS:
af = AF_NS;
break;
#endif
case K_LINK:
af = AF_LINK;
break;
default:
goto bad;
} else
bad: usage(*argv);
}
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0; /* protocol */
mib[3] = 0; /* wildcard address family */
mib[4] = NET_RT_DUMP;
mib[5] = 0; /* no flags */
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
err(EX_OSERR, "route-sysctl-estimate");
if ((buf = malloc(needed)) == NULL)
errx(EX_OSERR, "malloc failed");
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
err(EX_OSERR, "route-sysctl-get");
lim = buf + needed;
if (verbose)
(void) printf("Examining routing table from sysctl\n");
seqno = 0; /* ??? */
for (next = buf; next < lim; next += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)next;
if (verbose)
print_rtmsg(rtm, rtm->rtm_msglen);
if ((rtm->rtm_flags & RTF_GATEWAY) == 0)
continue;
if (af) {
struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
if (sa->sa_family != af)
continue;
}
if (debugonly)
continue;
rtm->rtm_type = RTM_DELETE;
rtm->rtm_seq = seqno;
rlen = write(s, next, rtm->rtm_msglen);
if (rlen < (int)rtm->rtm_msglen) {
warn("write to routing socket");
(void) printf("got only %d for rlen\n", rlen);
break;
}
seqno++;
if (qflag)
continue;
if (verbose)
print_rtmsg(rtm, rlen);
else {
struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
(void) printf("%-20.20s ", rtm->rtm_flags & RTF_HOST ?
routename(sa) : netname(sa));
sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa);
(void) printf("%-20.20s ", routename(sa));
(void) printf("done\n");
}
}
}
const char *
routename(sa)
struct sockaddr *sa;
{
register char *cp;
static char line[MAXHOSTNAMELEN + 1];
struct hostent *hp;
static char domain[MAXHOSTNAMELEN + 1];
static int first = 1, n;
#ifdef NS
char *ns_print();
#endif
if (first) {
first = 0;
if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
(cp = index(domain, '.'))) {
domain[MAXHOSTNAMELEN] = '\0';
(void) strcpy(domain, cp + 1);
} else
domain[0] = 0;
}
if (sa->sa_len == 0)
strcpy(line, "default");
else switch (sa->sa_family) {
case AF_INET:
{ struct in_addr in;
in = ((struct sockaddr_in *)sa)->sin_addr;
cp = 0;
if (in.s_addr == INADDR_ANY || sa->sa_len < 4)
cp = "default";
if (cp == 0 && !nflag) {
hp = gethostbyaddr((char *)&in, sizeof (struct in_addr),
AF_INET);
if (hp) {
if ((cp = index(hp->h_name, '.')) &&
!strcmp(cp + 1, domain))
*cp = 0;
cp = hp->h_name;
}
}
if (cp) {
strncpy(line, cp, sizeof(line) - 1);
line[sizeof(line) - 1] = '\0';
} else
(void) sprintf(line, "%s", inet_ntoa(in));
break;
}
#ifdef INET6
case AF_INET6:
{
struct sockaddr_in6 sin6; /* use static var for safety */
int niflags = 0;
#ifdef NI_WITHSCOPEID
niflags = NI_WITHSCOPEID;
#endif
memset(&sin6, 0, sizeof(sin6));
memcpy(&sin6, sa, sa->sa_len);
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_family = AF_INET6;
#ifdef __KAME__
if (sa->sa_len == sizeof(struct sockaddr_in6) &&
(IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) &&
sin6.sin6_scope_id == 0) {
sin6.sin6_scope_id =
ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
sin6.sin6_addr.s6_addr[2] = 0;
sin6.sin6_addr.s6_addr[3] = 0;
}
#endif
if (nflag)
niflags |= NI_NUMERICHOST;
if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
line, sizeof(line), NULL, 0, niflags) != 0)
strncpy(line, "invalid", sizeof(line));
return(line);
}
#endif
case AF_APPLETALK:
(void) snprintf(line, sizeof(line), "atalk %s",
atalk_ntoa(((struct sockaddr_at *)sa)->sat_addr));
break;
#ifdef NS
case AF_NS:
return (ns_print((struct sockaddr_ns *)sa));
#endif
case AF_LINK:
return (link_ntoa((struct sockaddr_dl *)sa));
default:
{ u_short *s = (u_short *)sa;
u_short *slim = s + ((sa->sa_len + 1) >> 1);
char *cp = line + sprintf(line, "(%d)", sa->sa_family);
char *cpe = line + sizeof(line);
while (++s < slim && cp < cpe) /* start with sa->sa_data */
if ((n = snprintf(cp, cpe - cp, " %x", *s)) > 0)
cp += n;
break;
}
}
return (line);
}
/*
* Return the name of the network whose address is given.
* The address is assumed to be that of a net or subnet, not a host.
*/
const char *
netname(sa)
struct sockaddr *sa;
{
char *cp = 0;
static char line[MAXHOSTNAMELEN + 1];
struct netent *np = 0;
u_long net, mask;
register u_long i;
int n, subnetshift;
#ifdef NS
char *ns_print();
#endif
switch (sa->sa_family) {
case AF_INET:
{ struct in_addr in;
in = ((struct sockaddr_in *)sa)->sin_addr;
i = in.s_addr = ntohl(in.s_addr);
if (in.s_addr == 0)
cp = "default";
else if (!nflag) {
if (IN_CLASSA(i)) {
mask = IN_CLASSA_NET;
subnetshift = 8;
} else if (IN_CLASSB(i)) {
mask = IN_CLASSB_NET;
subnetshift = 8;
} else {
mask = IN_CLASSC_NET;
subnetshift = 4;
}
/*
* If there are more bits than the standard mask
* would suggest, subnets must be in use.
* Guess at the subnet mask, assuming reasonable
* width subnet fields.
*/
while (in.s_addr &~ mask)
mask = (long)mask >> subnetshift;
net = in.s_addr & mask;
while ((mask & 1) == 0)
mask >>= 1, net >>= 1;
np = getnetbyaddr(net, AF_INET);
if (np)
cp = np->n_name;
}
#define C(x) (unsigned)((x) & 0xff)
if (cp)
strncpy(line, cp, sizeof(line));
else if ((in.s_addr & 0xffffff) == 0)
(void) sprintf(line, "%u", C(in.s_addr >> 24));
else if ((in.s_addr & 0xffff) == 0)
(void) sprintf(line, "%u.%u", C(in.s_addr >> 24),
C(in.s_addr >> 16));
else if ((in.s_addr & 0xff) == 0)
(void) sprintf(line, "%u.%u.%u", C(in.s_addr >> 24),
C(in.s_addr >> 16), C(in.s_addr >> 8));
else
(void) sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
C(in.s_addr >> 16), C(in.s_addr >> 8),
C(in.s_addr));
#undef C
break;
}
#ifdef INET6
case AF_INET6:
{
struct sockaddr_in6 sin6; /* use static var for safety */
int niflags = 0;
#ifdef NI_WITHSCOPEID
niflags = NI_WITHSCOPEID;
#endif
memset(&sin6, 0, sizeof(sin6));
memcpy(&sin6, sa, sa->sa_len);
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_family = AF_INET6;
#ifdef __KAME__
if (sa->sa_len == sizeof(struct sockaddr_in6) &&
(IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) &&
sin6.sin6_scope_id == 0) {
sin6.sin6_scope_id =
ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
sin6.sin6_addr.s6_addr[2] = 0;
sin6.sin6_addr.s6_addr[3] = 0;
}
#endif
if (nflag)
niflags |= NI_NUMERICHOST;
if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
line, sizeof(line), NULL, 0, niflags) != 0)
strncpy(line, "invalid", sizeof(line));
return(line);
}
#endif
case AF_APPLETALK:
(void) snprintf(line, sizeof(line), "atalk %s",
atalk_ntoa(((struct sockaddr_at *)sa)->sat_addr));
break;
#ifdef NS
case AF_NS:
return (ns_print((struct sockaddr_ns *)sa));
break;
#endif
case AF_LINK:
return (link_ntoa((struct sockaddr_dl *)sa));
default:
{ u_short *s = (u_short *)sa->sa_data;
u_short *slim = s + ((sa->sa_len + 1)>>1);
char *cp = line + sprintf(line, "af %d:", sa->sa_family);
char *cpe = line + sizeof(line);
while (s < slim && cp < cpe)
if ((n = snprintf(cp, cpe - cp, " %x", *s++)) > 0)
cp += n;
break;
}
}
return (line);
}
void
set_metric(value, key)
char *value;
int key;
{
int flag = 0;
u_long noval, *valp = &noval;
switch (key) {
#define caseof(x, y, z) case x: valp = &rt_metrics.z; flag = y; break
caseof(K_MTU, RTV_MTU, rmx_mtu);
caseof(K_HOPCOUNT, RTV_HOPCOUNT, rmx_hopcount);
caseof(K_EXPIRE, RTV_EXPIRE, rmx_expire);
caseof(K_RECVPIPE, RTV_RPIPE, rmx_recvpipe);
caseof(K_SENDPIPE, RTV_SPIPE, rmx_sendpipe);
caseof(K_SSTHRESH, RTV_SSTHRESH, rmx_ssthresh);
caseof(K_RTT, RTV_RTT, rmx_rtt);
caseof(K_RTTVAR, RTV_RTTVAR, rmx_rttvar);
}
rtm_inits |= flag;
if (lockrest || locking)
rt_metrics.rmx_locks |= flag;
if (locking)
locking = 0;
*valp = atoi(value);
}
void
newroute(argc, argv)
int argc;
register char **argv;
{
char *cmd, *dest = "", *gateway = "", *err;
int ishost = 0, proxy = 0, ret, attempts, oerrno, flags = RTF_STATIC;
int key;
struct hostent *hp = 0;
if (uid) {
errx(EX_NOPERM, "must be root to alter routing table");
}
cmd = argv[0];
if (*cmd != 'g')
shutdown(s, 0); /* Don't want to read back our messages */
while (--argc > 0) {
if (**(++argv)== '-') {
switch (key = keyword(1 + *argv)) {
case K_LINK:
af = AF_LINK;
aflen = sizeof(struct sockaddr_dl);
break;
case K_INET:
af = AF_INET;
aflen = sizeof(struct sockaddr_in);
break;
#ifdef INET6
case K_INET6:
af = AF_INET6;
aflen = sizeof(struct sockaddr_in6);
break;
#endif
case K_ATALK:
af = AF_APPLETALK;
aflen = sizeof(struct sockaddr_at);
break;
case K_SA:
af = PF_ROUTE;
aflen = sizeof(union sockunion);
break;
#ifdef NS
case K_XNS:
af = AF_NS;
aflen = sizeof(struct sockaddr_ns);
break;
#endif
case K_IFACE:
case K_INTERFACE:
iflag++;
break;
case K_NOSTATIC:
flags &= ~RTF_STATIC;
break;
case K_LLINFO:
flags |= RTF_LLINFO;
break;
case K_LOCK:
locking = 1;
break;
case K_LOCKREST:
lockrest = 1;
break;
case K_HOST:
forcehost++;
break;
case K_REJECT:
flags |= RTF_REJECT;
break;
case K_BLACKHOLE:
flags |= RTF_BLACKHOLE;
break;
case K_PROTO1:
flags |= RTF_PROTO1;
break;
case K_PROTO2:
flags |= RTF_PROTO2;
break;
case K_PROXY:
proxy = 1;
break;
case K_CLONING:
flags |= RTF_CLONING;
break;
case K_XRESOLVE:
flags |= RTF_XRESOLVE;
break;
case K_STATIC:
flags |= RTF_STATIC;
break;
case K_IFA:
if (!--argc)
usage((char *)NULL);
(void) getaddr(RTA_IFA, *++argv, 0);
break;
case K_IFP:
if (!--argc)
usage((char *)NULL);
(void) getaddr(RTA_IFP, *++argv, 0);
break;
case K_GENMASK:
if (!--argc)
usage((char *)NULL);
(void) getaddr(RTA_GENMASK, *++argv, 0);
break;
case K_GATEWAY:
if (!--argc)
usage((char *)NULL);
(void) getaddr(RTA_GATEWAY, *++argv, 0);
break;
case K_DST:
if (!--argc)
usage((char *)NULL);
ishost = getaddr(RTA_DST, *++argv, &hp);
dest = *argv;
break;
case K_NETMASK:
if (!--argc)
usage((char *)NULL);
(void) getaddr(RTA_NETMASK, *++argv, 0);
/* FALLTHROUGH */
case K_NET:
forcenet++;
break;
case K_PREFIXLEN:
if (!--argc)
usage((char *)NULL);
if (prefixlen(*++argv) == -1) {
forcenet = 0;
ishost = 1;
} else {
forcenet = 1;
ishost = 0;
}
break;
case K_MTU:
case K_HOPCOUNT:
case K_EXPIRE:
case K_RECVPIPE:
case K_SENDPIPE:
case K_SSTHRESH:
case K_RTT:
case K_RTTVAR:
if (!--argc)
usage((char *)NULL);
set_metric(*++argv, key);
break;
default:
usage(1+*argv);
}
} else {
if ((rtm_addrs & RTA_DST) == 0) {
dest = *argv;
ishost = getaddr(RTA_DST, *argv, &hp);
} else if ((rtm_addrs & RTA_GATEWAY) == 0) {
gateway = *argv;
(void) getaddr(RTA_GATEWAY, *argv, &hp);
} else {
(void) getaddr(RTA_NETMASK, *argv, 0);
forcenet = 1;
}
}
}
if (forcehost) {
ishost = 1;
#ifdef INET6
if (af == AF_INET6) {
rtm_addrs &= ~RTA_NETMASK;
memset((void *)&so_mask, 0, sizeof(so_mask));
}
#endif
}
if (forcenet)
ishost = 0;
flags |= RTF_UP;
if (ishost)
flags |= RTF_HOST;
if (iflag == 0)
flags |= RTF_GATEWAY;
if (proxy) {
so_dst.sinarp.sin_other = SIN_PROXY;
flags |= RTF_ANNOUNCE;
}
for (attempts = 1; ; attempts++) {
errno = 0;
if ((ret = rtmsg(*cmd, flags)) == 0)
break;
if (errno != ENETUNREACH && errno != ESRCH)
break;
if (af == AF_INET && *gateway && hp && hp->h_addr_list[1]) {
hp->h_addr_list++;
bcopy(hp->h_addr_list[0], &so_gate.sin.sin_addr,
MIN(hp->h_length, sizeof(so_gate.sin.sin_addr)));
} else
break;
}
if (*cmd == 'g')
exit(0);
oerrno = errno;
(void) printf("%s %s %s", cmd, ishost? "host" : "net", dest);
if (*gateway) {
(void) printf(": gateway %s", gateway);
if (attempts > 1 && ret == 0 && af == AF_INET)
(void) printf(" (%s)",
inet_ntoa(((struct sockaddr_in *)&route.rt_gateway)->sin_addr));
}
if (ret == 0) {
(void) printf("\n");
exit(0);
} else {
switch (oerrno) {
case ESRCH:
err = "not in table";
break;
case EBUSY:
err = "entry in use";
break;
case ENOBUFS:
err = "routing table overflow";
break;
case EDQUOT: /* handle recursion avoidance in rt_setgate() */
err = "gateway uses the same route";
break;
default:
err = strerror(oerrno);
break;
}
(void) printf(": %s\n", err);
exit(1);
}
}
void
inet_makenetandmask(net, sin, bits)
u_long net, bits;
register struct sockaddr_in *sin;
{
u_long addr, mask = 0;
register char *cp;
rtm_addrs |= RTA_NETMASK;
if (net == 0)
mask = addr = 0;
else if (net < 128) {
addr = net << IN_CLASSA_NSHIFT;
mask = IN_CLASSA_NET;
} else if (net < 65536) {
addr = net << IN_CLASSB_NSHIFT;
mask = IN_CLASSB_NET;
} else if (net < 16777216L) {
addr = net << IN_CLASSC_NSHIFT;
mask = IN_CLASSC_NET;
} else {
addr = net;
if ((addr & IN_CLASSA_HOST) == 0)
mask = IN_CLASSA_NET;
else if ((addr & IN_CLASSB_HOST) == 0)
mask = IN_CLASSB_NET;
else if ((addr & IN_CLASSC_HOST) == 0)
mask = IN_CLASSC_NET;
else
mask = -1;
}
if (bits)
mask = 0xffffffff << (32 - bits);
sin->sin_addr.s_addr = htonl(addr);
sin = &so_mask.sin;
sin->sin_addr.s_addr = htonl(mask);
sin->sin_len = 0;
sin->sin_family = 0;
cp = (char *)(&sin->sin_addr + 1);
while (*--cp == 0 && cp > (char *)sin)
;
sin->sin_len = 1 + cp - (char *)sin;
}
/*
* Interpret an argument as a network address of some kind,
* returning 1 if a host address, 0 if a network address.
*/
int
getaddr(which, s, hpp)
int which;
char *s;
struct hostent **hpp;
{
register sup su;
struct hostent *hp;
struct netent *np;
u_long val;
char *q;
int afamily; /* local copy of af so we can change it */
if (af == 0) {
af = AF_INET;
aflen = sizeof(struct sockaddr_in);
}
afamily = af;
rtm_addrs |= which;
switch (which) {
case RTA_DST:
su = &so_dst;
break;
case RTA_GATEWAY:
su = &so_gate;
if (iflag) {
struct ifaddrs *ifap, *ifa;
struct sockaddr_dl *sdl = NULL;
if (getifaddrs(&ifap))
err(1, "getifaddrs");
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family != AF_LINK)
continue;
if (strcmp(s, ifa->ifa_name))
continue;
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
}
/* If we found it, then use it */
if (sdl) {
/*
* Copy is safe since we have a
* sockaddr_storage member in sockunion{}.
* Note that we need to copy before calling
* freeifaddrs().
*/
memcpy(&su->sdl, sdl, sdl->sdl_len);
}
freeifaddrs(ifap);
if (sdl)
return(1);
}
break;
case RTA_NETMASK:
su = &so_mask;
break;
case RTA_GENMASK:
su = &so_genmask;
break;
case RTA_IFP:
su = &so_ifp;
afamily = AF_LINK;
break;
case RTA_IFA:
su = &so_ifa;
break;
default:
usage("internal error");
/*NOTREACHED*/
}
su->sa.sa_len = aflen;
su->sa.sa_family = afamily; /* cases that don't want it have left already */
if (strcmp(s, "default") == 0) {
/*
* Default is net 0.0.0.0/0
*/
switch (which) {
case RTA_DST:
forcenet++;
/* bzero(su, sizeof(*su)); *//* for readability */
(void) getaddr(RTA_NETMASK, s, 0);
break;
case RTA_NETMASK:
case RTA_GENMASK:
/* bzero(su, sizeof(*su)); *//* for readability */
}
return (0);
}
switch (afamily) {
#ifdef INET6
case AF_INET6:
{
struct addrinfo hints, *res;
memset(&hints, 0, sizeof(hints));
hints.ai_family = afamily; /*AF_INET6*/
hints.ai_flags = AI_NUMERICHOST;
hints.ai_socktype = SOCK_DGRAM; /*dummy*/
if (getaddrinfo(s, "0", &hints, &res) != 0 ||
res->ai_family != AF_INET6 ||
res->ai_addrlen != sizeof(su->sin6)) {
(void) fprintf(stderr, "%s: bad value\n", s);
exit(1);
}
memcpy(&su->sin6, res->ai_addr, sizeof(su->sin6));
#ifdef __KAME__
if ((IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr) ||
IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr)) &&
su->sin6.sin6_scope_id) {
*(u_int16_t *)&su->sin6.sin6_addr.s6_addr[2] =
htons(su->sin6.sin6_scope_id);
su->sin6.sin6_scope_id = 0;
}
#endif
freeaddrinfo(res);
return (0);
}
#endif /* INET6 */
#ifdef NS
case AF_NS:
if (which == RTA_DST) {
extern short ns_bh[3];
struct sockaddr_ns *sms = &(so_mask.sns);
bzero((char *)sms, sizeof(*sms));
sms->sns_family = 0;
sms->sns_len = 6;
sms->sns_addr.x_net = *(union ns_net *)ns_bh;
rtm_addrs |= RTA_NETMASK;
}
su->sns.sns_addr = ns_addr(s);
return (!ns_nullhost(su->sns.sns_addr));
#endif
case AF_APPLETALK:
if (!atalk_aton(s, &su->sat.sat_addr))
errx(EX_NOHOST, "bad address: %s", s);
rtm_addrs |= RTA_NETMASK;
return(forcehost || su->sat.sat_addr.s_node != 0);
case AF_LINK:
link_addr(s, &su->sdl);
return (1);
case PF_ROUTE:
su->sa.sa_len = sizeof(*su);
sockaddr(s, &su->sa);
return (1);
case AF_INET:
default:
break;
}
if (hpp == NULL)
hpp = &hp;
*hpp = NULL;
q = strchr(s,'/');
if (q && which == RTA_DST) {
*q = '\0';
if ((val = inet_network(s)) != INADDR_NONE) {
inet_makenetandmask(
val, &su->sin, strtoul(q+1, 0, 0));
return (0);
}
*q = '/';
}
if ((which != RTA_DST || forcenet == 0) &&
inet_aton(s, &su->sin.sin_addr)) {
val = su->sin.sin_addr.s_addr;
if (which != RTA_DST ||
inet_lnaof(su->sin.sin_addr) != INADDR_ANY)
return (1);
else {
val = ntohl(val);
goto netdone;
}
}
if (which == RTA_DST && forcehost == 0 &&
((val = inet_network(s)) != INADDR_NONE ||
((np = getnetbyname(s)) != NULL && (val = np->n_net) != 0))) {
netdone:
inet_makenetandmask(val, &su->sin, 0);
return (0);
}
hp = gethostbyname(s);
if (hp) {
*hpp = hp;
su->sin.sin_family = hp->h_addrtype;
bcopy(hp->h_addr, (char *)&su->sin.sin_addr,
MIN(hp->h_length, sizeof(su->sin.sin_addr)));
return (1);
}
errx(EX_NOHOST, "bad address: %s", s);
}
int
prefixlen(s)
char *s;
{
int len = atoi(s), q, r;
int max;
char *p;
rtm_addrs |= RTA_NETMASK;
switch (af) {
#ifdef INET6
case AF_INET6:
max = 128;
p = (char *)&so_mask.sin6.sin6_addr;
break;
#endif
case AF_INET:
max = 32;
p = (char *)&so_mask.sin.sin_addr;
break;
default:
(void) fprintf(stderr, "prefixlen not supported in this af\n");
exit(1);
/*NOTREACHED*/
}
if (len < 0 || max < len) {
(void) fprintf(stderr, "%s: bad value\n", s);
exit(1);
}
q = len >> 3;
r = len & 7;
so_mask.sa.sa_family = af;
so_mask.sa.sa_len = aflen;
memset((void *)p, 0, max / 8);
if (q > 0)
memset((void *)p, 0xff, q);
if (r > 0)
*((u_char *)p + q) = (0xff00 >> r) & 0xff;
if (len == max)
return -1;
else
return len;
}
#ifdef NS
short ns_nullh[] = {0,0,0};
short ns_bh[] = {-1,-1,-1};
char *
ns_print(sns)
struct sockaddr_ns *sns;
{
struct ns_addr work;
union { union ns_net net_e; u_long long_e; } net;
u_short port;
static char mybuf[50+MAXHOSTNAMELEN], cport[10], chost[25];
char *host = "";
register char *p;
register u_char *q;
work = sns->sns_addr;
port = ntohs(work.x_port);
work.x_port = 0;
net.net_e = work.x_net;
if (ns_nullhost(work) && net.long_e == 0) {
if (!port)
return ("*.*");
(void) sprintf(mybuf, "*.%XH", port);
return (mybuf);
}
if (bcmp((char *)ns_bh, (char *)work.x_host.c_host, 6) == 0)
host = "any";
else if (bcmp((char *)ns_nullh, (char *)work.x_host.c_host, 6) == 0)
host = "*";
else {
q = work.x_host.c_host;
(void) sprintf(chost, "%02X%02X%02X%02X%02X%02XH",
q[0], q[1], q[2], q[3], q[4], q[5]);
for (p = chost; *p == '0' && p < chost + 12; p++)
/* void */;
host = p;
}
if (port)
(void) sprintf(cport, ".%XH", htons(port));
else
*cport = 0;
(void) snprintf(mybuf, sizeof(mybuf), "%lxH.%s%s",
(unsigned long)ntohl(net.long_e),
host, cport);
return (mybuf);
}
#endif
void
interfaces()
{
size_t needed;
int mib[6];
char *buf, *lim, *next;
register struct rt_msghdr *rtm;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0; /* protocol */
mib[3] = 0; /* wildcard address family */
mib[4] = NET_RT_IFLIST;
mib[5] = 0; /* no flags */
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
err(EX_OSERR, "route-sysctl-estimate");
if ((buf = malloc(needed)) == NULL)
errx(EX_OSERR, "malloc failed");
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
err(EX_OSERR, "actual retrieval of interface table");
lim = buf + needed;
for (next = buf; next < lim; next += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)next;
print_rtmsg(rtm, rtm->rtm_msglen);
}
}
void
monitor()
{
int n;
char msg[2048];
verbose = 1;
if (debugonly) {
interfaces();
exit(0);
}
for(;;) {
time_t now;
n = read(s, msg, 2048);
now = time(NULL);
(void) printf("\ngot message of size %d on %s", n, ctime(&now));
print_rtmsg((struct rt_msghdr *)msg, n);
}
}
struct {
struct rt_msghdr m_rtm;
char m_space[512];
} m_rtmsg;
int
rtmsg(cmd, flags)
int cmd, flags;
{
static int seq;
int rlen;
register char *cp = m_rtmsg.m_space;
register int l;
#define NEXTADDR(w, u) \
if (rtm_addrs & (w)) {\
l = ROUNDUP(u.sa.sa_len); bcopy((char *)&(u), cp, l); cp += l;\
if (verbose) sodump(&(u),"u");\
}
errno = 0;
bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
if (cmd == 'a')
cmd = RTM_ADD;
else if (cmd == 'c')
cmd = RTM_CHANGE;
else if (cmd == 'g') {
cmd = RTM_GET;
if (so_ifp.sa.sa_family == 0) {
so_ifp.sa.sa_family = AF_LINK;
so_ifp.sa.sa_len = sizeof(struct sockaddr_dl);
rtm_addrs |= RTA_IFP;
}
} else
cmd = RTM_DELETE;
#define rtm m_rtmsg.m_rtm
rtm.rtm_type = cmd;
rtm.rtm_flags = flags;
rtm.rtm_version = RTM_VERSION;
rtm.rtm_seq = ++seq;
rtm.rtm_addrs = rtm_addrs;
rtm.rtm_rmx = rt_metrics;
rtm.rtm_inits = rtm_inits;
if (rtm_addrs & RTA_NETMASK)
mask_addr();
NEXTADDR(RTA_DST, so_dst);
NEXTADDR(RTA_GATEWAY, so_gate);
NEXTADDR(RTA_NETMASK, so_mask);
NEXTADDR(RTA_GENMASK, so_genmask);
NEXTADDR(RTA_IFP, so_ifp);
NEXTADDR(RTA_IFA, so_ifa);
rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
if (verbose)
print_rtmsg(&rtm, l);
if (debugonly)
return (0);
if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
warn("writing to routing socket");
return (-1);
}
if (cmd == RTM_GET) {
do {
l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
} while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
if (l < 0)
warn("read from routing socket");
else
print_getmsg(&rtm, l);
}
#undef rtm
return (0);
}
void
mask_addr()
{
int olen = so_mask.sa.sa_len;
register char *cp1 = olen + (char *)&so_mask, *cp2;
for (so_mask.sa.sa_len = 0; cp1 > (char *)&so_mask; )
if (*--cp1 != 0) {
so_mask.sa.sa_len = 1 + cp1 - (char *)&so_mask;
break;
}
if ((rtm_addrs & RTA_DST) == 0)
return;
switch (so_dst.sa.sa_family) {
#ifdef NS
case AF_NS:
#endif
case AF_INET:
#ifdef INET6
case AF_INET6:
#endif
case AF_APPLETALK:
case 0:
return;
}
cp1 = so_mask.sa.sa_len + 1 + (char *)&so_dst;
cp2 = so_dst.sa.sa_len + 1 + (char *)&so_dst;
while (cp2 > cp1)
*--cp2 = 0;
cp2 = so_mask.sa.sa_len + 1 + (char *)&so_mask;
while (cp1 > so_dst.sa.sa_data)
*--cp1 &= *--cp2;
}
char *msgtypes[] = {
"",
"RTM_ADD: Add Route",
"RTM_DELETE: Delete Route",
"RTM_CHANGE: Change Metrics or flags",
"RTM_GET: Report Metrics",
"RTM_LOSING: Kernel Suspects Partitioning",
"RTM_REDIRECT: Told to use different route",
"RTM_MISS: Lookup failed on this address",
"RTM_LOCK: fix specified metrics",
"RTM_OLDADD: caused by SIOCADDRT",
"RTM_OLDDEL: caused by SIOCDELRT",
"RTM_RESOLVE: Route created by cloning",
"RTM_NEWADDR: address being added to iface",
"RTM_DELADDR: address being removed from iface",
"RTM_IFINFO: iface status change",
"RTM_NEWMADDR: new multicast group membership on iface",
"RTM_DELMADDR: multicast group membership removed from iface",
0,
};
char metricnames[] =
"\011pksent\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire\2hopcount"
"\1mtu";
char routeflags[] =
"\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE\010MASK_PRESENT"
"\011CLONING\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE\016b016"
"\017PROTO2\020PROTO1\021PRCLONING\022WASCLONED\023PROTO3\024CHAINDELETE"
"\025PINNED\026LOCAL\027BROADCAST\030MULTICAST";
char ifnetflags[] =
"\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5PTP\6b6\7RUNNING\010NOARP"
"\011PPROMISC\012ALLMULTI\013OACTIVE\014SIMPLEX\015LINK0\016LINK1"
"\017LINK2\020MULTICAST";
char addrnames[] =
"\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR\010BRD";
void
print_rtmsg(rtm, msglen)
register struct rt_msghdr *rtm;
int msglen;
{
struct if_msghdr *ifm;
struct ifa_msghdr *ifam;
#ifdef RTM_NEWMADDR
struct ifma_msghdr *ifmam;
#endif
if (verbose == 0)
return;
if (rtm->rtm_version != RTM_VERSION) {
(void) printf("routing message version %d not understood\n",
rtm->rtm_version);
return;
}
(void)printf("%s: len %d, ", msgtypes[rtm->rtm_type], rtm->rtm_msglen);
switch (rtm->rtm_type) {
case RTM_IFINFO:
ifm = (struct if_msghdr *)rtm;
(void) printf("if# %d, flags:", ifm->ifm_index);
bprintf(stdout, ifm->ifm_flags, ifnetflags);
pmsg_addrs((char *)(ifm + 1), ifm->ifm_addrs);
break;
case RTM_NEWADDR:
case RTM_DELADDR:
ifam = (struct ifa_msghdr *)rtm;
(void) printf("metric %d, flags:", ifam->ifam_metric);
bprintf(stdout, ifam->ifam_flags, routeflags);
pmsg_addrs((char *)(ifam + 1), ifam->ifam_addrs);
break;
#ifdef RTM_NEWMADDR
case RTM_NEWMADDR:
case RTM_DELMADDR:
ifmam = (struct ifma_msghdr *)rtm;
pmsg_addrs((char *)(ifmam + 1), ifmam->ifmam_addrs);
break;
#endif
default:
(void) printf("pid: %ld, seq %d, errno %d, flags:",
(long)rtm->rtm_pid, rtm->rtm_seq, rtm->rtm_errno);
bprintf(stdout, rtm->rtm_flags, routeflags);
pmsg_common(rtm);
}
}
void
print_getmsg(rtm, msglen)
register struct rt_msghdr *rtm;
int msglen;
{
struct sockaddr *dst = NULL, *gate = NULL, *mask = NULL;
struct sockaddr_dl *ifp = NULL;
register struct sockaddr *sa;
register char *cp;
register int i;
(void) printf(" route to: %s\n", routename(&so_dst));
if (rtm->rtm_version != RTM_VERSION) {
warnx("routing message version %d not understood",
rtm->rtm_version);
return;
}
if (rtm->rtm_msglen > msglen) {
warnx("message length mismatch, in packet %d, returned %d",
rtm->rtm_msglen, msglen);
}
if (rtm->rtm_errno) {
errno = rtm->rtm_errno;
warn("message indicates error %d", errno);
return;
}
cp = ((char *)(rtm + 1));
if (rtm->rtm_addrs)
for (i = 1; i; i <<= 1)
if (i & rtm->rtm_addrs) {
sa = (struct sockaddr *)cp;
switch (i) {
case RTA_DST:
dst = sa;
break;
case RTA_GATEWAY:
gate = sa;
break;
case RTA_NETMASK:
mask = sa;
break;
case RTA_IFP:
if (sa->sa_family == AF_LINK &&
((struct sockaddr_dl *)sa)->sdl_nlen)
ifp = (struct sockaddr_dl *)sa;
break;
}
ADVANCE(cp, sa);
}
if (dst && mask)
mask->sa_family = dst->sa_family; /* XXX */
if (dst)
(void)printf("destination: %s\n", routename(dst));
if (mask) {
int savenflag = nflag;
nflag = 1;
(void)printf(" mask: %s\n", routename(mask));
nflag = savenflag;
}
if (gate && rtm->rtm_flags & RTF_GATEWAY)
(void)printf(" gateway: %s\n", routename(gate));
if (ifp)
(void)printf(" interface: %.*s\n",
ifp->sdl_nlen, ifp->sdl_data);
(void)printf(" flags: ");
bprintf(stdout, rtm->rtm_flags, routeflags);
#define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ')
#define msec(u) (((u) + 500) / 1000) /* usec to msec */
(void) printf("\n%s\n", "\
recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu expire");
printf("%8ld%c ", rtm->rtm_rmx.rmx_recvpipe, lock(RPIPE));
printf("%8ld%c ", rtm->rtm_rmx.rmx_sendpipe, lock(SPIPE));
printf("%8ld%c ", rtm->rtm_rmx.rmx_ssthresh, lock(SSTHRESH));
printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rtt), lock(RTT));
printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rttvar), lock(RTTVAR));
printf("%8ld%c ", rtm->rtm_rmx.rmx_hopcount, lock(HOPCOUNT));
printf("%8ld%c ", rtm->rtm_rmx.rmx_mtu, lock(MTU));
if (rtm->rtm_rmx.rmx_expire)
rtm->rtm_rmx.rmx_expire -= time(0);
printf("%8ld%c\n", rtm->rtm_rmx.rmx_expire, lock(EXPIRE));
#undef lock
#undef msec
#define RTA_IGN (RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_IFP|RTA_IFA|RTA_BRD)
if (verbose)
pmsg_common(rtm);
else if (rtm->rtm_addrs &~ RTA_IGN) {
(void) printf("sockaddrs: ");
bprintf(stdout, rtm->rtm_addrs, addrnames);
putchar('\n');
}
#undef RTA_IGN
}
void
pmsg_common(rtm)
register struct rt_msghdr *rtm;
{
(void) printf("\nlocks: ");
bprintf(stdout, rtm->rtm_rmx.rmx_locks, metricnames);
(void) printf(" inits: ");
bprintf(stdout, rtm->rtm_inits, metricnames);
pmsg_addrs(((char *)(rtm + 1)), rtm->rtm_addrs);
}
void
pmsg_addrs(cp, addrs)
char *cp;
int addrs;
{
register struct sockaddr *sa;
int i;
if (addrs == 0) {
(void) putchar('\n');
return;
}
(void) printf("\nsockaddrs: ");
bprintf(stdout, addrs, addrnames);
(void) putchar('\n');
for (i = 1; i; i <<= 1)
if (i & addrs) {
sa = (struct sockaddr *)cp;
(void) printf(" %s", routename(sa));
ADVANCE(cp, sa);
}
(void) putchar('\n');
(void) fflush(stdout);
}
void
bprintf(fp, b, s)
register FILE *fp;
register int b;
register u_char *s;
{
register int i;
int gotsome = 0;
if (b == 0)
return;
while ((i = *s++) != 0) {
if (b & (1 << (i-1))) {
if (gotsome == 0)
i = '<';
else
i = ',';
(void) putc(i, fp);
gotsome = 1;
for (; (i = *s) > 32; s++)
(void) putc(i, fp);
} else
while (*s > 32)
s++;
}
if (gotsome)
(void) putc('>', fp);
}
int
keyword(cp)
char *cp;
{
register struct keytab *kt = keywords;
while (kt->kt_cp && strcmp(kt->kt_cp, cp))
kt++;
return kt->kt_i;
}
void
sodump(su, which)
register sup su;
char *which;
{
switch (su->sa.sa_family) {
case AF_LINK:
(void) printf("%s: link %s; ",
which, link_ntoa(&su->sdl));
break;
case AF_INET:
(void) printf("%s: inet %s; ",
which, inet_ntoa(su->sin.sin_addr));
break;
case AF_APPLETALK:
(void) printf("%s: atalk %s; ",
which, atalk_ntoa(su->sat.sat_addr));
break;
#ifdef NS
case AF_NS:
(void) printf("%s: xns %s; ",
which, ns_ntoa(su->sns.sns_addr));
break;
#endif
}
(void) fflush(stdout);
}
/* States*/
#define VIRGIN 0
#define GOTONE 1
#define GOTTWO 2
/* Inputs */
#define DIGIT (4*0)
#define END (4*1)
#define DELIM (4*2)
void
sockaddr(addr, sa)
register char *addr;
register struct sockaddr *sa;
{
register char *cp = (char *)sa;
int size = sa->sa_len;
char *cplim = cp + size;
register int byte = 0, state = VIRGIN, new = 0 /* foil gcc */;
bzero(cp, size);
cp++;
do {
if ((*addr >= '0') && (*addr <= '9')) {
new = *addr - '0';
} else if ((*addr >= 'a') && (*addr <= 'f')) {
new = *addr - 'a' + 10;
} else if ((*addr >= 'A') && (*addr <= 'F')) {
new = *addr - 'A' + 10;
} else if (*addr == 0)
state |= END;
else
state |= DELIM;
addr++;
switch (state /* | INPUT */) {
case GOTTWO | DIGIT:
*cp++ = byte; /*FALLTHROUGH*/
case VIRGIN | DIGIT:
state = GOTONE; byte = new; continue;
case GOTONE | DIGIT:
state = GOTTWO; byte = new + (byte << 4); continue;
default: /* | DELIM */
state = VIRGIN; *cp++ = byte; byte = 0; continue;
case GOTONE | END:
case GOTTWO | END:
*cp++ = byte; /* FALLTHROUGH */
case VIRGIN | END:
break;
}
break;
} while (cp < cplim);
sa->sa_len = cp - (char *)sa;
}
int
atalk_aton(const char *text, struct at_addr *addr)
{
u_int net, node;
if (sscanf(text, "%u.%u", &net, &node) != 2
|| net > 0xffff || node > 0xff)
return(0);
addr->s_net = htons(net);
addr->s_node = node;
return(1);
}
char *
atalk_ntoa(struct at_addr at)
{
static char buf[20];
(void) snprintf(buf, sizeof(buf), "%u.%u", ntohs(at.s_net), at.s_node);
return(buf);
}
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