-/*
- * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
- * Reserved. This file contains Original Code and/or Modifications of
- * Original Code as defined in and that are subject to the Apple Public
- * Source License Version 1.0 (the 'License'). You may not use this file
- * except in compliance with the License. Please obtain a copy of the
- * License at http://www.apple.com/publicsource and read it before using
- * this file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License."
- *
- * @APPLE_LICENSE_HEADER_END@
- */
/*
* Copyright (c) 1984, 1993
* The Regents of the University of California. All rights reserved.
*/
#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 8.3 (Berkeley) 4/28/95";
+#if 0
+static char const sccsid[] = "@(#)from: arp.c 8.2 (Berkeley) 1/2/94";
+#endif
+static const char rcsid[] =
+ "$FreeBSD: src/usr.sbin/arp/arp.c,v 1.22.2.10 2002/06/18 00:16:59 kbyanc Exp $";
#endif /* not lint */
/*
#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 <sys/time.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
-#include <string.h>
+#include <strings.h>
#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <net/ethernet.h>
+
+void search(u_long addr, void (*action)(struct sockaddr_dl *sdl,
+ struct sockaddr_inarp *sin, struct rt_msghdr *rtm));
+void print_entry(struct sockaddr_dl *sdl,
+ struct sockaddr_inarp *addr, struct rt_msghdr *rtm);
+void nuke_entry(struct sockaddr_dl *sdl,
+ struct sockaddr_inarp *addr, struct rt_msghdr *rtm);
+int delete(char *host, char *info);
+void usage(void);
+int set(int argc, char **argv);
+int get(char *host);
+int file(char *name);
+void getsocket(void);
+int my_ether_aton(char *a, struct ether_addr *n);
+int rtmsg(int cmd);
+int get_ether_addr(u_int32_t ipaddr, struct ether_addr *hwaddr);
+
static int pid;
-static int nflag;
-static int aflag = 0;
+static int nflag; /* no reverse dns lookups */
+static int aflag; /* do it for all entries */
static int s = -1;
-int delete __P((char *, char *));
-void dump __P((u_long));
-int ether_aton __P((char *, u_char *));
-void ether_print __P((u_char *));
-int file __P((char *));
-void get __P((char *));
-void getsocket __P((void));
-int rtmsg __P((int));
-int set __P((int, char **));
-void usage __P((void));
+struct sockaddr_in so_mask;
+struct sockaddr_inarp blank_sin, sin_m;
+struct sockaddr_dl blank_sdl, sdl_m;
+int expire_time, flags, doing_proxy, proxy_only, found_entry;
+struct {
+ struct rt_msghdr m_rtm;
+ char m_space[512];
+} m_rtmsg;
+
+/* which function we're supposed to do */
+#define F_GET 1
+#define F_SET 2
+#define F_FILESET 3
+#define F_REPLACE 4
+#define F_DELETE 5
+
+#define ROUNDUP(a) \
+ ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
+#define SETFUNC(f) { if (func) usage(); func = (f); }
int
-main(argc, argv)
- int argc;
- char **argv;
+main(int argc, char *argv[])
{
- int ch;
+ int ch, func = 0;
+ int rtn = 0;
pid = getpid();
- while ((ch = getopt(argc, argv, "ands")) != EOF)
+ while ((ch = getopt(argc, argv, "andfsS")) != -1)
switch((char)ch) {
case 'a':
aflag = 1;
break;
case 'd':
- if (argc < 3 || argc > 4)
- usage();
- delete(argv[2], argv[3]);
- exit(0);
+ SETFUNC(F_DELETE);
+ break;
case 'n':
nflag = 1;
break;
+ case 'S':
+ SETFUNC(F_REPLACE);
+ break;
case 's':
- if (argc < 4 || argc > 7)
- usage();
- exit(set(argc-2, &argv[2]) ? 1 : 0);
+ SETFUNC(F_SET);
+ break;
+ case 'f' :
+ SETFUNC(F_FILESET);
+ break;
case '?':
default:
usage();
}
- if( aflag ) {
- dump(0);
- exit(0);
- }
- if( nflag && (argc == 3) ) {
- get(argv[2]);
- exit(0);
+ argc -= optind;
+ argv += optind;
+
+ bzero(&so_mask, sizeof(so_mask));
+ so_mask.sin_len = 8;
+ so_mask.sin_addr.s_addr = 0xffffffff;
+ bzero(&blank_sin, sizeof(blank_sin));
+ blank_sin.sin_len = sizeof(blank_sin);
+ blank_sin.sin_family = AF_INET;
+ bzero(&blank_sdl, sizeof(blank_sdl));
+ blank_sdl.sdl_len = sizeof(blank_sdl);
+ blank_sdl.sdl_family = AF_LINK;
+
+ if (!func)
+ func = F_GET;
+ switch (func) {
+ case F_GET:
+ if (aflag) {
+ if (argc != 0)
+ usage();
+ search(0, print_entry);
+ } else {
+ if (argc != 1)
+ usage();
+ get(argv[0]);
+ }
+ break;
+ case F_SET:
+ case F_REPLACE:
+ if (argc < 2 || argc > 6)
+ usage();
+ if (func == F_REPLACE)
+ (void) delete(argv[0], NULL);
+ rtn = set(argc, argv) ? 1 : 0;
+ break;
+ case F_DELETE:
+ if (aflag) {
+ if (argc != 0)
+ usage();
+ search(0, nuke_entry);
+ } else {
+ if (argc < 1 || argc > 2)
+ usage();
+ rtn = delete(argv[0], argv[1]);
+ }
+ break;
+ case F_FILESET:
+ if (argc != 1)
+ usage();
+ rtn = file(argv[0]);
+ break;
}
- if (argc != 2)
- usage();
- get(argv[1]);
- return (0);
+
+ return(rtn);
}
/*
* Process a file to set standard arp entries
*/
int
-file(name)
- char *name;
+file(char *name)
{
FILE *fp;
int i, retval;
char line[100], arg[5][50], *args[5];
- if ((fp = fopen(name, "r")) == NULL) {
- fprintf(stderr, "arp: cannot open %s\n", name);
- exit(1);
- }
+ if ((fp = fopen(name, "r")) == NULL)
+ errx(1, "cannot open %s", name);
args[0] = &arg[0][0];
args[1] = &arg[1][0];
args[2] = &arg[2][0];
args[4] = &arg[4][0];
retval = 0;
while(fgets(line, 100, fp) != NULL) {
- i = sscanf(line, "%s %s %s %s %s", arg[0], arg[1], arg[2],
- arg[3], arg[4]);
+ i = sscanf(line, "%49s %49s %49s %49s %49s", arg[0], arg[1],
+ arg[2], arg[3], arg[4]);
if (i < 2) {
- fprintf(stderr, "arp: bad line: %s\n", line);
+ warnx("bad line: %s", line);
retval = 1;
continue;
}
}
void
-getsocket() {
+getsocket(void)
+{
if (s < 0) {
s = socket(PF_ROUTE, SOCK_RAW, 0);
- if (s < 0) {
- perror("arp: socket");
- exit(1);
- }
+ if (s < 0)
+ err(1, "socket");
}
}
-struct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}};
-struct sockaddr_inarp blank_sin = {sizeof(blank_sin), AF_INET }, sin_m;
-struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m;
-int expire_time, flags, export_only, doing_proxy, found_entry;
-struct {
- struct rt_msghdr m_rtm;
- char m_space[512];
-} m_rtmsg;
-
/*
- * Set an individual arp entry
+ * Set an individual arp entry
*/
int
-set(argc, argv)
- int argc;
- char **argv;
+set(int argc, char **argv)
{
struct hostent *hp;
- register struct sockaddr_inarp *sin = &sin_m;
+ register struct sockaddr_inarp *addr = &sin_m;
register struct sockaddr_dl *sdl;
register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
- u_char *ea;
+ struct ether_addr *ea;
char *host = argv[0], *eaddr = argv[1];
getsocket();
argv += 2;
sdl_m = blank_sdl;
sin_m = blank_sin;
- sin->sin_addr.s_addr = inet_addr(host);
- if (sin->sin_addr.s_addr == -1) {
+ addr->sin_addr.s_addr = inet_addr(host);
+ if (addr->sin_addr.s_addr == INADDR_NONE) {
if (!(hp = gethostbyname(host))) {
- fprintf(stderr, "arp: %s: ", host);
- herror((char *)NULL);
+ warnx("%s: %s", host, hstrerror(h_errno));
return (1);
}
- bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
- sizeof sin->sin_addr);
+ bcopy((char *)hp->h_addr, (char *)&addr->sin_addr,
+ sizeof addr->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;
+ doing_proxy = flags = proxy_only = expire_time = 0;
while (argc-- > 0) {
if (strncmp(argv[0], "temp", 4) == 0) {
- struct timeval time;
- gettimeofday(&time, 0);
- expire_time = time.tv_sec + 20 * 60;
+ struct timeval tv;
+ gettimeofday(&tv, 0);
+ expire_time = tv.tv_sec + 20 * 60;
}
else if (strncmp(argv[0], "pub", 3) == 0) {
flags |= RTF_ANNOUNCE;
- doing_proxy = SIN_PROXY;
+ doing_proxy = 1;
+ if (argc && strncmp(argv[1], "only", 3) == 0) {
+ proxy_only = 1;
+ sin_m.sin_other = SIN_PROXY;
+ argc--; argv++;
+ }
} else if (strncmp(argv[0], "trail", 5) == 0) {
printf("%s: Sending trailers is no longer supported\n",
host);
}
argv++;
}
+ ea = (struct ether_addr *)LLADDR(&sdl_m);
+ if (doing_proxy && !strcmp(eaddr, "auto")) {
+ if (!get_ether_addr(addr->sin_addr.s_addr, ea)) {
+ printf("no interface found for %s\n",
+ inet_ntoa(addr->sin_addr));
+ return (1);
+ }
+ sdl_m.sdl_alen = ETHER_ADDR_LEN;
+ } else {
+ if (my_ether_aton(eaddr, ea) == 0)
+ sdl_m.sdl_alen = ETHER_ADDR_LEN;
+ }
tryagain:
if (rtmsg(RTM_GET) < 0) {
- perror(host);
+ warn("%s", host);
return (1);
}
- sin = (struct sockaddr_inarp *)(rtm + 1);
- sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin);
- if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
+ addr = (struct sockaddr_inarp *)(rtm + 1);
+ sdl = (struct sockaddr_dl *)(ROUNDUP(addr->sin_len) + (char *)addr);
+ if (addr->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
if (sdl->sdl_family == AF_LINK &&
(rtm->rtm_flags & RTF_LLINFO) &&
!(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
- case IFT_ISO88024: case IFT_ISO88025:
+ case IFT_ISO88024: case IFT_ISO88025: case IFT_L2VLAN:
goto overwrite;
}
if (doing_proxy == 0) {
return(1);
}
sin_m.sin_other = SIN_PROXY;
- export_only = 1;
+ proxy_only = 1;
goto tryagain;
}
overwrite:
/*
* Display an individual arp entry
*/
-void
-get(host)
- char *host;
+int
+get(char *host)
{
struct hostent *hp;
- struct sockaddr_inarp *sin = &sin_m;
+ struct sockaddr_inarp *addr = &sin_m;
sin_m = blank_sin;
- sin->sin_addr.s_addr = inet_addr(host);
- if (sin->sin_addr.s_addr == -1) {
- if (!(hp = gethostbyname(host))) {
- fprintf(stderr, "arp: %s: ", host);
- herror((char *)NULL);
- exit(1);
- }
- bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
- sizeof sin->sin_addr);
+ addr->sin_addr.s_addr = inet_addr(host);
+ if (addr->sin_addr.s_addr == INADDR_NONE) {
+ if (!(hp = gethostbyname(host)))
+ errx(1, "%s: %s", host, hstrerror(h_errno));
+ bcopy((char *)hp->h_addr, (char *)&addr->sin_addr,
+ sizeof addr->sin_addr);
}
- dump(sin->sin_addr.s_addr);
+ search(addr->sin_addr.s_addr, print_entry);
if (found_entry == 0) {
printf("%s (%s) -- no entry\n",
- host, inet_ntoa(sin->sin_addr));
- exit(1);
+ host, inet_ntoa(addr->sin_addr));
+ return(1);
}
+ return(0);
}
/*
- * Delete an arp entry
+ * Delete an arp entry
*/
int
-delete(host, info)
- char *host;
- char *info;
+delete(char *host, char *info)
{
struct hostent *hp;
- register struct sockaddr_inarp *sin = &sin_m;
+ register struct sockaddr_inarp *addr = &sin_m;
register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
struct sockaddr_dl *sdl;
- if (info && strncmp(info, "pro", 3) )
- export_only = 1;
getsocket();
sin_m = blank_sin;
- sin->sin_addr.s_addr = inet_addr(host);
- if (sin->sin_addr.s_addr == -1) {
+ if (info) {
+ if (strncmp(info, "pub", 3) == 0)
+ sin_m.sin_other = SIN_PROXY;
+ else
+ usage();
+ }
+ addr->sin_addr.s_addr = inet_addr(host);
+ if (addr->sin_addr.s_addr == INADDR_NONE) {
if (!(hp = gethostbyname(host))) {
- fprintf(stderr, "arp: %s: ", host);
- herror((char *)NULL);
+ warnx("%s: %s", host, hstrerror(h_errno));
return (1);
}
- bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
- sizeof sin->sin_addr);
+ bcopy((char *)hp->h_addr, (char *)&addr->sin_addr,
+ sizeof addr->sin_addr);
}
tryagain:
if (rtmsg(RTM_GET) < 0) {
- perror(host);
+ warn("%s", host);
return (1);
}
- sin = (struct sockaddr_inarp *)(rtm + 1);
- sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin);
- if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
+ addr = (struct sockaddr_inarp *)(rtm + 1);
+ sdl = (struct sockaddr_dl *)(ROUNDUP(addr->sin_len) + (char *)addr);
+ if (addr->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
if (sdl->sdl_family == AF_LINK &&
(rtm->rtm_flags & RTF_LLINFO) &&
!(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
- case IFT_ISO88024: case IFT_ISO88025:
+ case IFT_ISO88024: case IFT_ISO88025: case IFT_L2VLAN:
goto delete;
}
}
printf("cannot locate %s\n", host);
return (1);
}
- if (rtmsg(RTM_DELETE))
- return (1);
- printf("%s (%s) deleted\n", host, inet_ntoa(sin->sin_addr));
- return (0);
+ if (rtmsg(RTM_DELETE) == 0) {
+ printf("%s (%s) deleted\n", host, inet_ntoa(addr->sin_addr));
+ return (0);
+ }
+ return (1);
}
/*
- * Dump the entire arp table
+ * Search the arp table and do some action on matching entries
*/
void
-dump(addr)
- u_long addr;
+search(u_long addr, void (*action)(struct sockaddr_dl *sdl,
+ struct sockaddr_inarp *sin, struct rt_msghdr *rtm))
{
int mib[6];
size_t needed;
- char *host, *lim, *buf, *next;
+ char *lim, *buf, *next;
struct rt_msghdr *rtm;
- struct sockaddr_inarp *sin;
+ struct sockaddr_inarp *sin2;
struct sockaddr_dl *sdl;
- extern int h_errno;
- struct hostent *hp;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[4] = NET_RT_FLAGS;
mib[5] = RTF_LLINFO;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
- err(1, "route-sysctl-estimate");
+ errx(1, "route-sysctl-estimate");
if ((buf = malloc(needed)) == NULL)
- err(1, "malloc");
+ errx(1, "malloc");
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
- err(1, "actual retrieval of routing table");
+ errx(1, "actual retrieval of routing table");
lim = buf + needed;
for (next = buf; next < lim; next += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)next;
- sin = (struct sockaddr_inarp *)(rtm + 1);
- sdl = (struct sockaddr_dl *)(sin + 1);
+ sin2 = (struct sockaddr_inarp *)(rtm + 1);
+ sdl = (struct sockaddr_dl*)((char*)sin2 + ROUNDUP(sin2->sin_len));
if (addr) {
- if (addr != sin->sin_addr.s_addr)
+ if (addr != sin2->sin_addr.s_addr)
continue;
found_entry = 1;
}
- if (nflag == 0)
- hp = gethostbyaddr((caddr_t)&(sin->sin_addr),
- sizeof sin->sin_addr, AF_INET);
- else
- hp = 0;
- if (hp)
- host = hp->h_name;
- else {
- host = "?";
- if (h_errno == TRY_AGAIN)
- nflag = 1;
- }
- printf("%s (%s) at ", host, inet_ntoa(sin->sin_addr));
- if (sdl->sdl_alen)
- ether_print((u_char *)LLADDR(sdl));
- else
- printf("(incomplete)");
- if (rtm->rtm_rmx.rmx_expire == 0)
- printf(" permanent");
- if (sin->sin_other & SIN_PROXY)
- printf(" published (proxy only)");
- if (rtm->rtm_addrs & RTA_NETMASK) {
- sin = (struct sockaddr_inarp *)
- (sdl->sdl_len + (char *)sdl);
- if (sin->sin_addr.s_addr == 0xffffffff)
- printf(" published");
- if (sin->sin_len != 8)
- printf("(wierd)");
- }
- printf("\n");
+ (*action)(sdl, sin2, rtm);
}
+ free(buf);
}
+
+/*
+ * Stolen and adapted from ifconfig
+ */
+static void
+print_lladdr(struct sockaddr_dl *sdl)
+{
+ char *cp;
+ int n;
+
+ cp = (char *)LLADDR(sdl);
+ if ((n = sdl->sdl_alen) > 0) {
+ while (--n >= 0)
+ printf("%x%s",*cp++ & 0xff, n>0? ":" : "");
+ }
+}
+
+
+/*
+ * Display an arp entry
+ */
void
-ether_print(cp)
- u_char *cp;
+print_entry(struct sockaddr_dl *sdl,
+ struct sockaddr_inarp *addr, struct rt_msghdr *rtm)
{
- printf("%x:%x:%x:%x:%x:%x", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
+ const char *host;
+ struct hostent *hp;
+ struct iso88025_sockaddr_dl_data *trld;
+ char ifname[IF_NAMESIZE];
+ int seg;
+
+ if (nflag == 0)
+ hp = gethostbyaddr((caddr_t)&(addr->sin_addr),
+ sizeof addr->sin_addr, AF_INET);
+ else
+ hp = 0;
+ if (hp)
+ host = hp->h_name;
+ else {
+ host = "?";
+ if (h_errno == TRY_AGAIN)
+ nflag = 1;
+ }
+ printf("%s (%s) at ", host, inet_ntoa(addr->sin_addr));
+ if (sdl->sdl_alen) {
+ print_lladdr(sdl);
+ } else
+ printf("(incomplete)");
+ if (if_indextoname(sdl->sdl_index, ifname) != NULL)
+ printf(" on %s", ifname);
+ if (rtm->rtm_rmx.rmx_expire == 0)
+ printf(" permanent");
+ if (addr->sin_other & SIN_PROXY)
+ printf(" published (proxy only)");
+ if (rtm->rtm_addrs & RTA_NETMASK) {
+ addr = (struct sockaddr_inarp *)
+ (ROUNDUP(sdl->sdl_len) + (char *)sdl);
+ if (addr->sin_addr.s_addr == 0xffffffff)
+ printf(" published");
+ if (addr->sin_len != 8)
+ printf("(weird)");
+ }
+ switch(sdl->sdl_type) {
+ case IFT_ETHER:
+ printf(" [ethernet]");
+ break;
+ case IFT_ISO88025:
+#ifndef __APPLE__
+ printf(" [token-ring]");
+ trld = SDL_ISO88025(sdl);
+ if (trld->trld_rcf != 0) {
+ printf(" rt=%x", ntohs(trld->trld_rcf));
+ for (seg = 0;
+ seg < ((TR_RCF_RIFLEN(trld->trld_rcf) - 2 ) / 2);
+ seg++)
+ printf(":%x", ntohs(*(trld->trld_route[seg])));
+ }
+#endif
+ break;
+ case IFT_L2VLAN:
+ printf(" [vlan]");
+ break;
+ case IFT_IEEE1394:
+ printf(" [firewire]");
+ break;
+ default:
+ break;
+ }
+
+ printf("\n");
+
+}
+
+/*
+ * Nuke an arp entry
+ */
+void
+nuke_entry(struct sockaddr_dl *sdl,
+ struct sockaddr_inarp *addr, struct rt_msghdr *rtm )
+{
+ char ip[20];
+
+ snprintf(ip, sizeof(ip), "%s", inet_ntoa(addr->sin_addr));
+ delete(ip, NULL);
}
int
-ether_aton(a, n)
- char *a;
- u_char *n;
+my_ether_aton(char *a, struct ether_addr *n)
{
- int i, o[6];
+ struct ether_addr *ea;
- i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2],
- &o[3], &o[4], &o[5]);
- if (i != 6) {
- fprintf(stderr, "arp: invalid Ethernet address '%s'\n", a);
+ if ((ea = ether_aton(a)) == NULL) {
+ warnx("invalid Ethernet address '%s'", a);
return (1);
}
- for (i=0; i<6; i++)
- n[i] = o[i];
+ *n = *ea;
return (0);
}
void
-usage()
+usage(void)
{
- printf("usage: arp [-n] hostname\n");
- printf(" arp [-n] -a\n");
- printf(" arp -d hostname\n");
- printf(" arp -s hostname ether_addr [temp] [pub]\n");
- printf(" arp -f filename\n");
+ fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
+ "usage: arp [-n] hostname",
+ " arp [-n] -a",
+ " arp -d hostname [pub]",
+ " arp -d -a",
+ " arp -s hostname ether_addr [temp] [pub]",
+ " arp -S hostname ether_addr [temp] [pub]",
+ " arp -f filename");
exit(1);
}
int
-rtmsg(cmd)
- int cmd;
+rtmsg(int cmd)
{
static int seq;
int rlen;
switch (cmd) {
default:
- fprintf(stderr, "arp: internal wrong cmd\n");
- exit(1);
+ errx(1, "internal wrong cmd");
case RTM_ADD:
rtm->rtm_addrs |= RTA_GATEWAY;
rtm->rtm_rmx.rmx_expire = expire_time;
rtm->rtm_flags |= (RTF_HOST | RTF_STATIC);
sin_m.sin_other = 0;
if (doing_proxy) {
- if (export_only)
+ if (proxy_only)
sin_m.sin_other = SIN_PROXY;
else {
rtm->rtm_addrs |= RTA_NETMASK;
}
#define NEXTADDR(w, s) \
if (rtm->rtm_addrs & (w)) { \
- bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}
+ bcopy((char *)&s, cp, sizeof(s)); cp += ROUNDUP(sizeof(s));}
NEXTADDR(RTA_DST, sin_m);
NEXTADDR(RTA_GATEWAY, sdl_m);
rtm->rtm_type = cmd;
if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
if (errno != ESRCH || cmd != RTM_DELETE) {
- perror("writing to routing socket");
+ warn("writing to routing socket");
return (-1);
}
}
l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
} while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid));
if (l < 0)
- (void) fprintf(stderr, "arp: read from routing socket: %s\n",
- strerror(errno));
+ warn("read from routing socket");
return (0);
}
+
+/*
+ * 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_int32_t ipaddr, struct ether_addr *hwaddr)
+{
+ struct ifreq *ifr, *ifend, *ifp;
+ u_int32_t ina, mask;
+ struct sockaddr_dl *dla;
+ struct ifreq ifreq;
+ struct ifconf ifc;
+ struct ifreq ifs[MAX_IFS];
+ int sock;
+
+ sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock < 0)
+ err(1, "socket");
+
+ ifc.ifc_len = sizeof(ifs);
+ ifc.ifc_req = ifs;
+ if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) {
+ warnx("ioctl(SIOCGIFCONF)");
+ close(sock);
+ 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(sock, 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(sock, 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
+ + MAX(ifr->ifr_addr.sa_len, sizeof(ifr->ifr_addr)));
+ }
+
+ if (ifr >= ifend) {
+ close(sock);
+ 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;
+ close (sock);
+ printf("using interface %s for proxy with address ",
+ ifp->ifr_name);
+ print_lladdr(dla);
+ printf("\n");
+ return dla->sdl_alen;
+ }
+ ifr = (struct ifreq *) ((char *)&ifr->ifr_addr
+ + MAX(ifr->ifr_addr.sa_len, sizeof(ifr->ifr_addr)));
+ }
+ return 0;
+}
projects / apple / network_cmds.git / blobdiff