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Clean up warnings.

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fix return/exit codes in some cases.
Add -S which will delete any old entry first.
Add "auto" in proxy case, so it finds the right interface automatically.
This commit is contained in:
Poul-Henning Kamp 1996-02-08 21:05:52 +00:00
parent 7cdd64468f
commit a42a667de1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=13977
2 changed files with 178 additions and 35 deletions
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12
usr.sbin/arp/arp.8
View File

@ -49,6 +49,10 @@
.Op Ar temp
.Op Ar pub
.Nm arp
.Fl S Ar hostname ether_addr
.Op Ar temp
.Op Ar pub
.Nm arp
.Fl f Ar filename
.Sh DESCRIPTION
The
@ -95,6 +99,14 @@ server,
responding to requests for
.Ar hostname
even though the host address is not its own.
In this case the ether_addr can be given as `auto''
in which case the interfaces on this host will be examined,
and if one of them is found to occupy the same subnet, its
ether_addr will be used.
.It Fl S Ar hostname ether_addr
Is just like
.Fl s
except any existing arp entry for this host will be deleted first.
.It Fl f
Causes the file
.Ar filename

201
usr.sbin/arp/arp.c
View File

@ -35,13 +35,14 @@
*/
#ifndef lint
static char copyright[] =
static char const copyright[] =
"@(#) Copyright (c) 1984, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)arp.c 8.2 (Berkeley) 1/2/94";
static char const sccsid[] = "@(#)from: arp.c 8.2 (Berkeley) 1/2/94";
static char const freebsdid[] = "$Id$";
#endif /* not lint */
/*
@ -52,7 +53,9 @@ static char sccsid[] = "@(#)arp.c 8.2 (Berkeley) 1/2/94";
#include <sys/param.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_dl.h>
@ -68,14 +71,30 @@ static char sccsid[] = "@(#)arp.c 8.2 (Berkeley) 1/2/94";
#include <errno.h>
#include <nlist.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <strings.h>
#include <paths.h>
void dump(u_long addr);
int delete(char *host, char *info);
void ether_print(u_char *cp);
void usage(void);
int set(int argc, char **argv);
void get(char *host);
int file(char *name);
void getsocket(void);
int ether_aton(char *a, u_char *n);
int rtmsg(int cmd);
void quit(char *msg);
int get_ether_addr(u_long ipaddr, u_char *hwaddr);
extern int errno;
static int pid;
static int kflag;
static int nflag;
static int s = -1;
int
main(argc, argv)
int argc;
char **argv;
@ -83,7 +102,7 @@ main(argc, argv)
int ch;
pid = getpid();
while ((ch = getopt(argc, argv, "andfs")) != EOF)
while ((ch = getopt(argc, argv, "andfsS")) != EOF)
switch((char)ch) {
case 'a':
dump(0);
@ -96,6 +115,9 @@ main(argc, argv)
case 'n':
nflag = 1;
continue;
case 'S':
delete(argv[2], NULL);
/* FALL THROUGH */
case 's':
if (argc < 4 || argc > 7)
usage();
@ -103,8 +125,7 @@ main(argc, argv)
case 'f' :
if (argc != 3)
usage();
file(argv[2]);
exit(0);
return (file(argv[2]));
case '?':
default:
usage();
@ -118,8 +139,8 @@ main(argc, argv)
/*
* Process a file to set standard arp entries
*/
file(name)
char *name;
int
file(char *name)
{
FILE *fp;
int i, retval;
@ -150,7 +171,9 @@ file(name)
return (retval);
}
getsocket() {
void
getsocket(void)
{
if (s < 0) {
s = socket(PF_ROUTE, SOCK_RAW, 0);
if (s < 0) {
@ -172,9 +195,8 @@ struct {
/*
* Set an individual arp entry
*/
set(argc, argv)
int argc;
char **argv;
int
set(int argc, char **argv)
{
struct hostent *hp;
register struct sockaddr_inarp *sin = &sin_m;
@ -198,9 +220,6 @@ set(argc, argv)
bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
sizeof sin->sin_addr);
}
ea = (u_char *)LLADDR(&sdl_m);
if (ether_aton(eaddr, ea) == 0)
sdl_m.sdl_alen = 6;
doing_proxy = flags = export_only = expire_time = 0;
while (argc-- > 0) {
if (strncmp(argv[0], "temp", 4) == 0) {
@ -217,6 +236,16 @@ set(argc, argv)
}
argv++;
}
ea = (u_char *)LLADDR(&sdl_m);
if (doing_proxy && !strcmp(eaddr, "auto")) {
if (!get_ether_addr(sin->sin_addr.s_addr, ea)) {
return (1);
}
sdl_m.sdl_alen = 6;
} else {
if (ether_aton(eaddr, ea) == 0)
sdl_m.sdl_alen = 6;
}
tryagain:
if (rtmsg(RTM_GET) < 0) {
perror(host);
@ -257,12 +286,11 @@ set(argc, argv)
/*
* Display an individual arp entry
*/
get(host)
char *host;
void
get(char *host)
{
struct hostent *hp;
struct sockaddr_inarp *sin = &sin_m;
u_char *ea;
sin_m = blank_sin;
sin->sin_addr.s_addr = inet_addr(host);
@ -286,16 +314,13 @@ get(host)
/*
* Delete an arp entry
*/
delete(host, info)
char *host;
char *info;
int
delete(char *host, char *info)
{
struct hostent *hp;
register struct sockaddr_inarp *sin = &sin_m;
register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
struct sockaddr_dl *sdl;
u_char *ea;
char *eaddr;
if (info && strncmp(info, "pro", 3) )
export_only = 1;
@ -339,15 +364,18 @@ delete(host, info)
printf("cannot locate %s\n", host);
return (1);
}
if (rtmsg(RTM_DELETE) == 0)
if (rtmsg(RTM_DELETE) == 0) {
printf("%s (%s) deleted\n", host, inet_ntoa(sin->sin_addr));
return (0);
}
return (1);
}
/*
* Dump the entire arp table
*/
dump(addr)
u_long addr;
void
dump(u_long addr)
{
int mib[6];
size_t needed;
@ -413,15 +441,14 @@ u_long addr;
}
}
ether_print(cp)
u_char *cp;
void
ether_print(u_char *cp)
{
printf("%x:%x:%x:%x:%x:%x", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
}
ether_aton(a, n)
char *a;
u_char *n;
int
ether_aton(char *a, u_char *n)
{
int i, o[6];
@ -436,17 +463,20 @@ ether_aton(a, n)
return (0);
}
usage()
void
usage(void)
{
printf("usage: arp hostname\n");
printf(" arp -a [kernel] [kernel_memory]\n");
printf(" arp -d hostname\n");
printf(" arp -s hostname ether_addr [temp] [pub]\n");
printf(" arp -S hostname ether_addr [temp] [pub]\n");
printf(" arp -f filename\n");
exit(1);
}
rtmsg(cmd)
int
rtmsg(int cmd)
{
static int seq;
int rlen;
@ -511,9 +541,110 @@ rtmsg(cmd)
return (0);
}
quit(msg)
char *msg;
void
quit(char *msg)
{
fprintf(stderr, "%s\n", msg);
exit(1);
}
/*
* get_ether_addr - get the hardware address of an interface on the
* the same subnet as ipaddr.
*/
#define MAX_IFS 32
int
get_ether_addr(u_long ipaddr, u_char *hwaddr)
{
struct ifreq *ifr, *ifend, *ifp;
u_long ina, mask;
struct sockaddr_dl *dla;
struct ifreq ifreq;
struct ifconf ifc;
struct ifreq ifs[MAX_IFS];
int s;
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0) {
perror("socket");
exit(1);
}
ifc.ifc_len = sizeof(ifs);
ifc.ifc_req = ifs;
if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
fprintf(stderr, "ioctl(SIOCGIFCONF): \n");
close(s);
return 0;
}
/*
* Scan through looking for an interface with an Internet
* address on the same subnet as `ipaddr'.
*/
ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
for (ifr = ifc.ifc_req; ifr < ifend; ) {
if (ifr->ifr_addr.sa_family == AF_INET) {
ina = ((struct sockaddr_in *)
&ifr->ifr_addr)->sin_addr.s_addr;
strncpy(ifreq.ifr_name, ifr->ifr_name,
sizeof(ifreq.ifr_name));
/*
* Check that the interface is up,
* and not point-to-point or loopback.
*/
if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0)
continue;
if ((ifreq.ifr_flags &
(IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|
IFF_LOOPBACK|IFF_NOARP))
!= (IFF_UP|IFF_BROADCAST))
goto nextif;
/*
* Get its netmask and check that it's on
* the right subnet.
*/
if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
continue;
mask = ((struct sockaddr_in *)
&ifreq.ifr_addr)->sin_addr.s_addr;
if ((ipaddr & mask) != (ina & mask))
goto nextif;
break;
}
nextif:
ifr = (struct ifreq *)
((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
}
if (ifr >= ifend) {
close(s);
return 0;
}
/*
* Now scan through again looking for a link-level address
* for this interface.
*/
ifp = ifr;
for (ifr = ifc.ifc_req; ifr < ifend; ) {
if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
&& ifr->ifr_addr.sa_family == AF_LINK) {
/*
* Found the link-level address - copy it out
*/
dla = (struct sockaddr_dl *) &ifr->ifr_addr;
memcpy(hwaddr, LLADDR(dla), dla->sdl_alen);
close (s);
printf("using interface %s for proxy with address ",
ifp->ifr_name);
ether_print(hwaddr);
printf("\n");
return dla->sdl_alen;
}
ifr = (struct ifreq *)
((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
}
return 0;
}