d0055759dd
Change-Id: I95f0d0c48f998d4d950a0800eedd5fbbf2e50423
478 lines
9.3 KiB
C
478 lines
9.3 KiB
C
/*
|
|
arp.c
|
|
|
|
Created: Jan 2001 by Philip Homburg <philip@f-mnx.phicoh.com>
|
|
|
|
Manipulate ARP table
|
|
*/
|
|
|
|
#define _POSIX_C_SOURCE 2
|
|
#define _NETBSD_SOURCE 1
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include <sys/ioctl.h>
|
|
|
|
#include <net/netlib.h>
|
|
#include <net/gen/ether.h>
|
|
#include <net/gen/if_ether.h>
|
|
#include <net/gen/in.h>
|
|
#include <net/gen/inet.h>
|
|
#include <net/gen/ip_io.h>
|
|
#include <netdb.h>
|
|
#include <net/gen/socket.h>
|
|
|
|
#include <net/gen/arp_io.h>
|
|
|
|
#include <arpa/inet.h>
|
|
|
|
char *progname;
|
|
static int ipfd= -1;
|
|
static int do_setuid= 0;
|
|
|
|
static void do_open(char *devname);
|
|
static void show_one(char *hostname, int do_num);
|
|
static void show_all(int do_num);
|
|
static void print_one(ipaddr_t ipaddr, nwio_arp_t *arpp, int do_num);
|
|
static void delete_all(void);
|
|
static void delete(char *hostname);
|
|
static void do_set(char *hostname, char *ethername, int temp, int pub,
|
|
int optdelete);
|
|
static ipaddr_t nametoipaddr(char *hostname);
|
|
static void fatal(const char *fmt, ...);
|
|
static void usage(void);
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int c;
|
|
char *hostname, *ethername;
|
|
int do_temp, do_pub;
|
|
int a_flag, d_flag, n_flag, s_flag, S_flag;
|
|
char *I_arg;
|
|
|
|
(progname=strrchr(argv[0],'/')) ? progname++ : (progname=argv[0]);
|
|
|
|
a_flag= d_flag= n_flag= s_flag= S_flag= 0;
|
|
I_arg= NULL;
|
|
while(c= getopt(argc, argv, "adnsS?I:"), c != -1)
|
|
{
|
|
switch(c)
|
|
{
|
|
case '?': usage();
|
|
case 'a': a_flag= 1; break;
|
|
case 'd': d_flag= 1; break;
|
|
case 'n': n_flag= 1; break;
|
|
case 's': s_flag= 1; break;
|
|
case 'S': S_flag= 1; break;
|
|
case 'I': I_arg= optarg; break;
|
|
default: fatal("getopt failed: '%c'", c);
|
|
}
|
|
}
|
|
|
|
hostname= NULL; /* lint */
|
|
ethername= NULL; /* lint */
|
|
do_temp= do_pub= 0; /* lint */
|
|
|
|
if (n_flag + d_flag + s_flag + S_flag > 1)
|
|
usage();
|
|
if (s_flag || S_flag)
|
|
{
|
|
if (optind >= argc) usage();
|
|
hostname= argv[optind++];
|
|
|
|
if (optind >= argc) usage();
|
|
ethername= argv[optind++];
|
|
|
|
do_temp= do_pub= 0;
|
|
while (optind < argc)
|
|
{
|
|
if (strcasecmp(argv[optind], "temp") == 0)
|
|
{
|
|
do_temp= 1;
|
|
optind++;
|
|
continue;
|
|
}
|
|
if (strcasecmp(argv[optind], "pub") == 0)
|
|
{
|
|
do_pub= 1;
|
|
optind++;
|
|
continue;
|
|
}
|
|
usage();
|
|
}
|
|
}
|
|
else if (d_flag)
|
|
{
|
|
if (!a_flag)
|
|
{
|
|
if (optind >= argc)
|
|
usage();
|
|
hostname= argv[optind++];
|
|
if (optind != argc)
|
|
usage();
|
|
}
|
|
}
|
|
else if (a_flag)
|
|
{
|
|
if (optind != argc)
|
|
usage();
|
|
do_setuid= 1;
|
|
}
|
|
else
|
|
{
|
|
if (optind >= argc)
|
|
usage();
|
|
hostname= argv[optind++];
|
|
if (optind != argc)
|
|
usage();
|
|
do_setuid= 1;
|
|
}
|
|
|
|
do_open(I_arg);
|
|
if (d_flag)
|
|
{
|
|
if (a_flag)
|
|
delete_all();
|
|
else
|
|
delete(hostname);
|
|
}
|
|
else if (s_flag || S_flag)
|
|
do_set(hostname, ethername, do_temp, do_pub, S_flag);
|
|
else if (a_flag)
|
|
show_all(n_flag);
|
|
else
|
|
show_one(hostname, n_flag);
|
|
exit(0);
|
|
}
|
|
|
|
static void do_open(char *devname)
|
|
{
|
|
size_t l;
|
|
char *check;
|
|
|
|
if (do_setuid && devname)
|
|
{
|
|
/* Only strings that consist of IP_DEVICE optionally
|
|
* followed by a number are allowed.
|
|
*/
|
|
l= strlen(IP_DEVICE);
|
|
if (strncmp(devname, IP_DEVICE, l) != 0)
|
|
do_setuid= 0;
|
|
else if (strlen(devname) == l)
|
|
; /* OK */
|
|
else
|
|
{
|
|
strtoul(devname+l, &check, 10);
|
|
if (check[0] != '\0')
|
|
do_setuid= 0;
|
|
}
|
|
}
|
|
if (!devname)
|
|
devname= IP_DEVICE;
|
|
if (!do_setuid)
|
|
{
|
|
setuid(getuid());
|
|
setgid(getgid());
|
|
}
|
|
ipfd= open(devname, O_RDWR);
|
|
if (ipfd == -1)
|
|
fatal("unable to open '%s': %s", devname, strerror(errno));
|
|
}
|
|
|
|
static void show_one(char *hostname, int do_num)
|
|
{
|
|
int r;
|
|
ipaddr_t ipaddr;
|
|
nwio_arp_t arp;
|
|
|
|
ipaddr= nametoipaddr(hostname);
|
|
|
|
arp.nwa_ipaddr= ipaddr;
|
|
r= ioctl(ipfd, NWIOARPGIP, &arp);
|
|
if (r == -1 && errno == ENOENT)
|
|
{
|
|
print_one(ipaddr, NULL, do_num);
|
|
exit(1);
|
|
}
|
|
if (r == -1)
|
|
fatal("NWIOARPGIP failed: %s", strerror(errno));
|
|
print_one(ipaddr, &arp, do_num);
|
|
}
|
|
|
|
static void show_all(int do_num)
|
|
{
|
|
int ind, max, i, r;
|
|
nwio_arp_t *arptab;
|
|
nwio_arp_t arp;
|
|
|
|
/* First get all entries */
|
|
max= 10;
|
|
ind= 0;
|
|
arptab= malloc(max * sizeof(*arptab));
|
|
if (arptab == NULL)
|
|
{
|
|
fatal("out of memory, can't get %d bytes",
|
|
max*sizeof(*arptab));
|
|
}
|
|
arp.nwa_entno= 0;
|
|
for (;;)
|
|
{
|
|
if (ind == max)
|
|
{
|
|
max *= 2;
|
|
arptab= realloc(arptab, max * sizeof(*arptab));
|
|
if (!arptab)
|
|
{
|
|
fatal("out of memory, can't get %d bytes",
|
|
max*sizeof(*arptab));
|
|
}
|
|
}
|
|
r= ioctl(ipfd, NWIOARPGNEXT, &arp);
|
|
if (r == -1 && errno == ENOENT)
|
|
break;
|
|
if (r == -1)
|
|
fatal("NWIOARPGNEXT failed: %s", strerror(errno));
|
|
arptab[ind]= arp;
|
|
ind++;
|
|
}
|
|
|
|
for (i= 0; i<ind; i++)
|
|
print_one(0, &arptab[i], do_num);
|
|
}
|
|
|
|
static void print_one(ipaddr_t ipaddr, nwio_arp_t *arpp, int do_num)
|
|
{
|
|
u32_t flags;
|
|
struct hostent *he;
|
|
|
|
if (arpp)
|
|
ipaddr= arpp->nwa_ipaddr;
|
|
if (!do_num)
|
|
he= gethostbyaddr((char *)&ipaddr, sizeof(ipaddr), AF_INET);
|
|
else
|
|
he= NULL;
|
|
if (he)
|
|
printf("%s (%s)", he->h_name,
|
|
inet_ntoa(*(struct in_addr *)&ipaddr));
|
|
else
|
|
printf("%s", inet_ntoa(*(struct in_addr *)&ipaddr));
|
|
if (!arpp)
|
|
{
|
|
printf(" -- no entry\n");
|
|
return;
|
|
}
|
|
flags= arpp->nwa_flags;
|
|
if (flags & NWAF_INCOMPLETE)
|
|
printf(" is incomplete");
|
|
else if (flags & NWAF_DEAD)
|
|
printf(" is dead");
|
|
else
|
|
{
|
|
printf(" is at %s", ether_ntoa(&arpp->nwa_ethaddr));
|
|
if (flags & NWAF_PERM)
|
|
printf(" permanent");
|
|
if (flags & NWAF_PUB)
|
|
printf(" published");
|
|
}
|
|
printf("\n");
|
|
}
|
|
|
|
static void delete_all(void)
|
|
{
|
|
int ind, max, i, r;
|
|
nwio_arp_t *arptab;
|
|
nwio_arp_t arp;
|
|
|
|
/* First get all entries */
|
|
max= 10;
|
|
ind= 0;
|
|
arptab= malloc(max * sizeof(*arptab));
|
|
if (arptab == NULL)
|
|
{
|
|
fatal("out of memory, can't get %d bytes",
|
|
max*sizeof(*arptab));
|
|
}
|
|
arp.nwa_entno= 0;
|
|
for (;;)
|
|
{
|
|
if (ind == max)
|
|
{
|
|
max *= 2;
|
|
arptab= realloc(arptab, max * sizeof(*arptab));
|
|
if (arptab == NULL)
|
|
{
|
|
fatal("out of memory, can't get %d bytes",
|
|
max*sizeof(*arptab));
|
|
}
|
|
}
|
|
r= ioctl(ipfd, NWIOARPGNEXT, &arp);
|
|
if (r == -1 && errno == ENOENT)
|
|
break;
|
|
if (r == -1)
|
|
fatal("NWIOARPGNEXT failed: %s", strerror(errno));
|
|
arptab[ind]= arp;
|
|
ind++;
|
|
}
|
|
|
|
for (i= 0; i<ind; i++)
|
|
{
|
|
r= ioctl(ipfd, NWIOARPDIP, &arptab[i]);
|
|
if (r == 0)
|
|
continue;
|
|
if (errno == EINVAL || errno == ENOENT)
|
|
{
|
|
/* Entry is incomplete of entry is already deleted */
|
|
continue;
|
|
}
|
|
fatal("unable to delete host %s: %s",
|
|
inet_ntoa(*(struct in_addr *)&arptab[i].nwa_ipaddr),
|
|
strerror(errno));
|
|
}
|
|
}
|
|
|
|
static void delete(char *hostname)
|
|
{
|
|
int r;
|
|
ipaddr_t ipaddr;
|
|
nwio_arp_t arp;
|
|
|
|
ipaddr= nametoipaddr(hostname);
|
|
arp.nwa_ipaddr= ipaddr;
|
|
r= ioctl(ipfd, NWIOARPDIP, &arp);
|
|
if (r == 0)
|
|
return;
|
|
if (errno == ENOENT)
|
|
{
|
|
print_one(ipaddr, NULL, 0);
|
|
exit(1);
|
|
}
|
|
fatal("unable to delete host %s: %s",
|
|
inet_ntoa(*(struct in_addr *)&ipaddr),
|
|
errno == EINVAL ? "entry is incomplete" : strerror(errno));
|
|
}
|
|
|
|
static void do_set(char *hostname, char *ethername, int temp, int pub,
|
|
int optdelete)
|
|
{
|
|
int r;
|
|
ipaddr_t ipaddr;
|
|
ether_addr_t *eap;
|
|
ether_addr_t ethaddr;
|
|
nwio_arp_t arp;
|
|
nwio_ipconf_t ipconf;
|
|
|
|
ipaddr= nametoipaddr(hostname);
|
|
if (pub && strcasecmp(ethername, "auto") == 0)
|
|
{
|
|
r= ioctl(ipfd, NWIOGIPCONF, &ipconf);
|
|
if (r == -1)
|
|
fatal("NWIOGIPCONF failed: %s", strerror(errno));
|
|
arp.nwa_ipaddr= ipconf.nwic_ipaddr;
|
|
r= ioctl(ipfd, NWIOARPGIP, &arp);
|
|
if (r == -1)
|
|
fatal("NWIOARPGIP failed: %s", strerror(errno));
|
|
ethaddr= arp.nwa_ethaddr;
|
|
}
|
|
else if (eap= ether_aton(ethername), eap != NULL)
|
|
ethaddr= *eap;
|
|
else if (ether_hostton(ethername, ðaddr) != 0)
|
|
{
|
|
fatal("unable to parse ethernet address '%s'",
|
|
ethername);
|
|
}
|
|
|
|
if (optdelete)
|
|
{
|
|
arp.nwa_ipaddr= ipaddr;
|
|
r= ioctl(ipfd, NWIOARPDIP, &arp);
|
|
if (r == -1 && errno != ENOENT)
|
|
{
|
|
fatal("unable to delete entry for host %s: %s",
|
|
inet_ntoa(*(struct in_addr *)&ipaddr),
|
|
errno == EINVAL ? "incomplete entry" :
|
|
strerror(errno));
|
|
}
|
|
}
|
|
|
|
arp.nwa_ipaddr= ipaddr;
|
|
arp.nwa_ethaddr= ethaddr;
|
|
arp.nwa_flags= 0;
|
|
if (pub)
|
|
arp.nwa_flags |= NWAF_PUB;
|
|
if (!temp)
|
|
arp.nwa_flags |= NWAF_PERM;
|
|
r= ioctl(ipfd, NWIOARPSIP, &arp);
|
|
if (r == -1)
|
|
{
|
|
fatal("unable to set arp entry: %s",
|
|
errno == EEXIST ? "entry exists" : strerror(errno));
|
|
}
|
|
}
|
|
|
|
static ipaddr_t nametoipaddr(char *hostname)
|
|
{
|
|
ipaddr_t ipaddr;
|
|
struct hostent *he;
|
|
|
|
if (inet_aton(hostname, (struct in_addr *)&ipaddr) == 0)
|
|
{
|
|
he= gethostbyname(hostname);
|
|
if (!he)
|
|
fatal("unknown hostname '%s'", hostname);
|
|
if (he->h_addrtype != AF_INET ||
|
|
he->h_length != sizeof(ipaddr))
|
|
{
|
|
fatal("strange host '%s': addrtype %d, length %d",
|
|
he->h_addrtype, he->h_length);
|
|
}
|
|
memcpy(&ipaddr, he->h_addr, sizeof(ipaddr));
|
|
}
|
|
return ipaddr;
|
|
}
|
|
|
|
#if 0
|
|
static char *ether_ntoa(struct ether_addr *eap)
|
|
{
|
|
static char buf[]= "xx:xx:xx:xx:xx:xx";
|
|
|
|
sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x",
|
|
eap->ea_addr[0], eap->ea_addr[1],
|
|
eap->ea_addr[2], eap->ea_addr[3],
|
|
eap->ea_addr[4], eap->ea_addr[5]);
|
|
return buf;
|
|
}
|
|
#endif
|
|
|
|
static void fatal(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
fprintf(stderr, "%s: ", progname);
|
|
vfprintf(stderr, fmt, ap);
|
|
fprintf(stderr, "\n");
|
|
va_end(ap);
|
|
|
|
exit(1);
|
|
}
|
|
|
|
static void usage(void)
|
|
{
|
|
fprintf(stderr, "Usage:\tarp [-I ip-dev] [-n] hostname\n"
|
|
"\tarp [-I ip-dev] [-n] -a\n"
|
|
"\tarp [-I ip-dev] -d hostname\n"
|
|
"\tarp [-I ip-dev] -d -a\n"
|
|
"\tarp [-I ip-dev] -s hostname ether-addr [temp] [pub]\n"
|
|
"\tarp [-I ip-dev] -S hostname ether-addr [temp] [pub]\n");
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* $PchId: arp.c,v 1.3 2005/01/31 22:31:45 philip Exp $
|
|
*/
|