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freebsd-dev/sbin/route/route.c
Qing Li 6e6b3f7cbc This main goals of this project are: 
1. separating L2 tables (ARP, NDP) from the L3 routing tables
2. removing as much locking dependencies among these layers as
   possible to allow for some parallelism in the search operations
3. simplify the logic in the routing code,

The most notable end result is the obsolescent of the route
cloning (RTF_CLONING) concept, which translated into code reduction
in both IPv4 ARP and IPv6 NDP related modules, and size reduction in
struct rtentry{}. The change in design obsoletes the semantics of
RTF_CLONING, RTF_WASCLONE and RTF_LLINFO routing flags. The userland
applications such as "arp" and "ndp" have been modified to reflect
those changes. The output from "netstat -r" shows only the routing
entries.

Quite a few developers have contributed to this project in the
past: Glebius Smirnoff, Luigi Rizzo, Alessandro Cerri, and
Andre Oppermann. And most recently:

- Kip Macy revised the locking code completely, thus completing
  the last piece of the puzzle, Kip has also been conducting
  active functional testing
- Sam Leffler has helped me improving/refactoring the code, and
  provided valuable reviews
- Julian Elischer setup the perforce tree for me and has helped
  me maintaining that branch before the svn conversion
2008-12-15 06:10:57 +00:00

1662 lines
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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.
* 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 8.6 (Berkeley) 4/28/95";
#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>
#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;
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;
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;
uid_t uid;
int atalk_aton(const char *, struct at_addr *);
char *atalk_ntoa(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();
#ifdef INET6
static int inet6_makenetandmask(struct sockaddr_in6 *, char *);
#endif
int getaddr(), rtmsg(), x25_makemask();
int prefixlen();
extern char *iso_ntoa();
void usage(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 */
}
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 = geteuid();
if (tflag)
s = open(_PATH_DEVNULL, O_WRONLY, 0);
else
s = socket(PF_ROUTE, SOCK_RAW, 0);
if (s < 0)
err(EX_OSERR, "socket");
if (*argv)
switch (keyword(*argv)) {
case K_GET:
uid = 0;
/* FALLTHROUGH */
case K_CHANGE:
case K_ADD:
case K_DEL:
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, count = 0;
char *buf, *next, *lim;
struct rt_msghdr *rtm;
if (uid && !debugonly) {
errx(EX_NOPERM, "must be root to alter routing table");
}
shutdown(s, SHUT_RD); /* 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;
case K_LINK:
af = AF_LINK;
break;
default:
goto bad;
} else
bad: usage(*argv);
}
retry:
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) {
if (errno == ENOMEM && count++ < 10) {
warnx("Routing table grew, retrying");
sleep(1);
free(buf);
goto retry;
}
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 < 0 && errno == EPERM)
err(1, "write to routing socket");
if (rlen < (int)rtm->rtm_msglen) {
warn("write to routing socket");
(void) printf("got only %d for rlen\n", rlen);
free(buf);
goto retry;
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 *)(SA_SIZE(sa) + (char *)sa);
(void) printf("%-20.20s ", routename(sa));
(void) printf("done\n");
}
}
}
const char *
routename(sa)
struct sockaddr *sa;
{
char *cp;
static char line[MAXHOSTNAMELEN + 1];
struct hostent *hp;
static char domain[MAXHOSTNAMELEN + 1];
static int first = 1, n;
if (first) {
first = 0;
if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
(cp = strchr(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 = strchr(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;
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;
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;
else
*cp = '\0';
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;
u_long i;
int n, subnetshift;
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;
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;
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;
else
*cp = '\0';
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;
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, SHUT_RD); /* 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;
case K_IFACE:
case K_INTERFACE:
iflag++;
break;
case K_NOSTATIC:
flags &= ~RTF_STATIC;
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_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++;
memmove(&so_gate.sin.sin_addr, hp->h_addr_list[0],
MIN(hp->h_length, sizeof(so_gate.sin.sin_addr)));
} else
break;
}
if (*cmd == 'g')
exit(ret != 0);
if (!qflag) {
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");
} else {
switch (oerrno) {
case ESRCH:
err = "not in table";
break;
case EBUSY:
err = "entry in use";
break;
case ENOBUFS:
err = "not enough memory";
break;
case EADDRINUSE:
/* handle recursion avoidance in rt_setgate() */
err = "gateway uses the same route";
break;
case EEXIST:
err = "route already in table";
break;
default:
err = strerror(oerrno);
break;
}
(void) printf(": %s\n", err);
}
}
exit(ret != 0);
}
void
inet_makenetandmask(net, sin, bits)
u_long net, bits;
struct sockaddr_in *sin;
{
u_long addr, mask = 0;
char *cp;
rtm_addrs |= RTA_NETMASK;
if (net == 0)
mask = addr = 0;
else {
if (net <= 0xff)
addr = net << IN_CLASSA_NSHIFT;
else if (net <= 0xffff)
addr = net << IN_CLASSB_NSHIFT;
else if (net <= 0xffffff)
addr = net << IN_CLASSC_NSHIFT;
else
addr = net;
if (bits != 0)
mask = 0xffffffff << (32 - bits);
else {
if (IN_CLASSA(addr))
mask = IN_CLASSA_NET;
else if (IN_CLASSB(addr))
mask = IN_CLASSB_NET;
else if (IN_CLASSC(addr))
mask = IN_CLASSC_NET;
else if (IN_MULTICAST(addr))
mask = IN_CLASSD_NET;
else
mask = 0xffffffff;
}
}
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;
}
#ifdef INET6
/*
* XXX the function may need more improvement...
*/
static int
inet6_makenetandmask(sin6, plen)
struct sockaddr_in6 *sin6;
char *plen;
{
struct in6_addr in6;
if (!plen) {
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
sin6->sin6_scope_id == 0) {
plen = "0";
} else if ((sin6->sin6_addr.s6_addr[0] & 0xe0) == 0x20) {
/* aggregatable global unicast - RFC2374 */
memset(&in6, 0, sizeof(in6));
if (!memcmp(&sin6->sin6_addr.s6_addr[8],
&in6.s6_addr[8], 8))
plen = "64";
}
}
if (!plen || strcmp(plen, "128") == 0)
return 1;
rtm_addrs |= RTA_NETMASK;
(void)prefixlen(plen);
return 0;
}
#endif
/*
* 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;
{
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++;
#if 0
bzero(su, sizeof(*su)); /* for readability */
#endif
(void) getaddr(RTA_NETMASK, s, 0);
break;
#if 0
case RTA_NETMASK:
case RTA_GENMASK:
bzero(su, sizeof(*su)); /* for readability */
#endif
}
return (0);
}
switch (afamily) {
#ifdef INET6
case AF_INET6:
{
struct addrinfo hints, *res;
int ecode;
q = NULL;
if (which == RTA_DST && (q = strchr(s, '/')) != NULL)
*q = '\0';
memset(&hints, 0, sizeof(hints));
hints.ai_family = afamily; /*AF_INET6*/
hints.ai_socktype = SOCK_DGRAM; /*dummy*/
ecode = getaddrinfo(s, NULL, &hints, &res);
if (ecode != 0 || res->ai_family != AF_INET6 ||
res->ai_addrlen != sizeof(su->sin6)) {
(void) fprintf(stderr, "%s: %s\n", s,
gai_strerror(ecode));
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_MC_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);
if (q != NULL)
*q++ = '/';
if (which == RTA_DST)
return (inet6_makenetandmask(&su->sin6, q));
return (0);
}
#endif /* INET6 */
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 || forcehost ||
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;
memmove((char *)&su->sin.sin_addr, hp->h_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;
}
void
interfaces()
{
size_t needed;
int mib[6];
char *buf, *lim, *next, count = 0;
struct rt_msghdr *rtm;
retry2:
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) {
if (errno == ENOMEM && count++ < 10) {
warnx("Routing table grew, retrying");
sleep(1);
free(buf);
goto retry2;
}
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;
char *cp = m_rtmsg.m_space;
int l;
#define NEXTADDR(w, u) \
if (rtm_addrs & (w)) {\
l = SA_SIZE(&(u.sa)); memmove(cp, &(u), l); cp += l;\
if (verbose) sodump(&(u),#u);\
}
errno = 0;
memset(&m_rtmsg, 0, 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) {
if (errno == EPERM)
err(1, "writing to routing socket");
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;
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) {
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",
"RTM_IFANNOUNCE: interface arrival/departure",
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)
struct rt_msghdr *rtm;
int msglen;
{
struct if_msghdr *ifm;
struct ifa_msghdr *ifam;
#ifdef RTM_NEWMADDR
struct ifma_msghdr *ifmam;
#endif
struct if_announcemsghdr *ifan;
char *state;
if (verbose == 0)
return;
if (rtm->rtm_version != RTM_VERSION) {
(void) printf("routing message version %d not understood\n",
rtm->rtm_version);
return;
}
if (msgtypes[rtm->rtm_type] != NULL)
(void)printf("%s: ", msgtypes[rtm->rtm_type]);
else
(void)printf("#%d: ", rtm->rtm_type);
(void)printf("len %d, ", rtm->rtm_msglen);
switch (rtm->rtm_type) {
case RTM_IFINFO:
ifm = (struct if_msghdr *)rtm;
(void) printf("if# %d, ", ifm->ifm_index);
switch (ifm->ifm_data.ifi_link_state) {
case LINK_STATE_DOWN:
state = "down";
break;
case LINK_STATE_UP:
state = "up";
break;
default:
state = "unknown";
break;
}
(void) printf("link: %s, flags:", state);
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
case RTM_IFANNOUNCE:
ifan = (struct if_announcemsghdr *)rtm;
(void) printf("if# %d, what: ", ifan->ifan_index);
switch (ifan->ifan_what) {
case IFAN_ARRIVAL:
printf("arrival");
break;
case IFAN_DEPARTURE:
printf("departure");
break;
default:
printf("#%d", ifan->ifan_what);
break;
}
printf("\n");
break;
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)
struct rt_msghdr *rtm;
int msglen;
{
struct sockaddr *dst = NULL, *gate = NULL, *mask = NULL;
struct sockaddr_dl *ifp = NULL;
struct sockaddr *sa;
char *cp;
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;
}
cp += SA_SIZE(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)
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;
{
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));
cp += SA_SIZE(sa);
}
(void) putchar('\n');
(void) fflush(stdout);
}
void
bprintf(fp, b, s)
FILE *fp;
int b;
u_char *s;
{
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;
{
struct keytab *kt = keywords;
while (kt->kt_cp && strcmp(kt->kt_cp, cp))
kt++;
return kt->kt_i;
}
void
sodump(su, which)
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;
}
(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)
char *addr;
struct sockaddr *sa;
{
char *cp = (char *)sa;
int size = sa->sa_len;
char *cplim = cp + size;
int byte = 0, state = VIRGIN, new = 0 /* foil gcc */;
memset(cp, 0, 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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