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-rw-r--r--usr.sbin/arp/arp.c868
1 files changed, 0 insertions, 868 deletions
diff --git a/usr.sbin/arp/arp.c b/usr.sbin/arp/arp.c
deleted file mode 100644
index 2ee9d67..0000000
--- a/usr.sbin/arp/arp.c
+++ /dev/null
@@ -1,868 +0,0 @@
-/*
- * Copyright (c) 1984, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Sun Microsystems, Inc.
- *
- * 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.
- */
-
-#if 0
-#ifndef lint
-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 const sccsid[] = "@(#)from: arp.c 8.2 (Berkeley) 1/2/94";
-#endif /* not lint */
-#endif
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-/*
- * arp - display, set, and delete arp table entries
- */
-
-
-#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 <net/if_types.h>
-#include <net/route.h>
-#include <net/iso88025.h>
-
-#include <netinet/in.h>
-#include <netinet/if_ether.h>
-
-#include <arpa/inet.h>
-
-#include <ctype.h>
-#include <err.h>
-#include <errno.h>
-#include <netdb.h>
-#include <nlist.h>
-#include <paths.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <strings.h>
-#include <unistd.h>
-
-typedef void (action_fn)(struct sockaddr_dl *sdl,
- struct sockaddr_inarp *s_in, struct rt_msghdr *rtm);
-
-static int search(u_long addr, action_fn *action);
-static action_fn print_entry;
-static action_fn nuke_entry;
-
-static int delete(char *host, int do_proxy);
-static void usage(void);
-static int set(int argc, char **argv);
-static int get(char *host);
-static int file(char *name);
-static struct rt_msghdr *rtmsg(int cmd,
- struct sockaddr_inarp *dst, struct sockaddr_dl *sdl);
-static int get_ether_addr(in_addr_t ipaddr, struct ether_addr *hwaddr);
-static struct sockaddr_inarp *getaddr(char *host);
-static int valid_type(int type);
-
-static int nflag; /* no reverse dns lookups */
-static char *rifname;
-
-static time_t expire_time;
-static int flags, doing_proxy, proxy_only;
-
-/* 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 SETFUNC(f) { if (func) usage(); func = (f); }
-
-int
-main(int argc, char *argv[])
-{
- int ch, func = 0;
- int rtn = 0;
- int aflag = 0; /* do it for all entries */
-
- while ((ch = getopt(argc, argv, "andfsSi:")) != -1)
- switch(ch) {
- case 'a':
- aflag = 1;
- break;
- case 'd':
- SETFUNC(F_DELETE);
- break;
- case 'n':
- nflag = 1;
- break;
- case 'S':
- SETFUNC(F_REPLACE);
- break;
- case 's':
- SETFUNC(F_SET);
- break;
- case 'f' :
- SETFUNC(F_FILESET);
- break;
- case 'i':
- rifname = optarg;
- break;
- case '?':
- default:
- usage();
- }
- argc -= optind;
- argv += optind;
-
- if (!func)
- func = F_GET;
- if (rifname) {
- if (func != F_GET && !(func == F_DELETE && aflag))
- errx(1, "-i not applicable to this operation");
- if (if_nametoindex(rifname) == 0) {
- if (errno == ENXIO)
- errx(1, "interface %s does not exist", rifname);
- else
- err(1, "if_nametoindex(%s)", rifname);
- }
- }
- switch (func) {
- case F_GET:
- if (aflag) {
- if (argc != 0)
- usage();
- search(0, print_entry);
- } else {
- if (argc != 1)
- usage();
- rtn = get(argv[0]);
- }
- break;
- case F_SET:
- case F_REPLACE:
- if (argc < 2 || argc > 6)
- usage();
- if (func == F_REPLACE)
- (void)delete(argv[0], 0);
- rtn = set(argc, argv) ? 1 : 0;
- break;
- case F_DELETE:
- if (aflag) {
- if (argc != 0)
- usage();
- search(0, nuke_entry);
- } else {
- if (argc == 2 && strncmp(argv[1], "pub", 3) == 0)
- ch = SIN_PROXY;
- else if (argc == 1)
- ch = 0;
- else
- usage();
- rtn = delete(argv[0], ch);
- }
- break;
- case F_FILESET:
- if (argc != 1)
- usage();
- rtn = file(argv[0]);
- break;
- }
-
- return (rtn);
-}
-
-/*
- * Process a file to set standard arp entries
- */
-static int
-file(char *name)
-{
- FILE *fp;
- int i, retval;
- char line[100], arg[5][50], *args[5], *p;
-
- if ((fp = fopen(name, "r")) == NULL)
- err(1, "cannot open %s", name);
- args[0] = &arg[0][0];
- args[1] = &arg[1][0];
- args[2] = &arg[2][0];
- args[3] = &arg[3][0];
- args[4] = &arg[4][0];
- retval = 0;
- while(fgets(line, sizeof(line), fp) != NULL) {
- if ((p = strchr(line, '#')) != NULL)
- *p = '\0';
- for (p = line; isblank(*p); p++);
- if (*p == '\n' || *p == '\0')
- continue;
- i = sscanf(p, "%49s %49s %49s %49s %49s", arg[0], arg[1],
- arg[2], arg[3], arg[4]);
- if (i < 2) {
- warnx("bad line: %s", line);
- retval = 1;
- continue;
- }
- if (set(i, args))
- retval = 1;
- }
- fclose(fp);
- return (retval);
-}
-
-/*
- * Given a hostname, fills up a (static) struct sockaddr_inarp with
- * the address of the host and returns a pointer to the
- * structure.
- */
-static struct sockaddr_inarp *
-getaddr(char *host)
-{
- struct hostent *hp;
- static struct sockaddr_inarp reply;
-
- bzero(&reply, sizeof(reply));
- reply.sin_len = sizeof(reply);
- reply.sin_family = AF_INET;
- reply.sin_addr.s_addr = inet_addr(host);
- if (reply.sin_addr.s_addr == INADDR_NONE) {
- if (!(hp = gethostbyname(host))) {
- warnx("%s: %s", host, hstrerror(h_errno));
- return (NULL);
- }
- bcopy((char *)hp->h_addr, (char *)&reply.sin_addr,
- sizeof reply.sin_addr);
- }
- return (&reply);
-}
-
-/*
- * Returns true if the type is a valid one for ARP.
- */
-static int
-valid_type(int type)
-{
-
- switch (type) {
- case IFT_ETHER:
- case IFT_FDDI:
- case IFT_ISO88023:
- case IFT_ISO88024:
- case IFT_ISO88025:
- case IFT_L2VLAN:
- case IFT_BRIDGE:
- return (1);
- default:
- return (0);
- }
-}
-
-/*
- * Set an individual arp entry
- */
-static int
-set(int argc, char **argv)
-{
- struct sockaddr_inarp *addr;
- struct sockaddr_inarp *dst; /* what are we looking for */
- struct sockaddr_dl *sdl;
- struct rt_msghdr *rtm;
- struct ether_addr *ea;
- char *host = argv[0], *eaddr = argv[1];
- struct sockaddr_dl sdl_m;
-
- argc -= 2;
- argv += 2;
-
- bzero(&sdl_m, sizeof(sdl_m));
- sdl_m.sdl_len = sizeof(sdl_m);
- sdl_m.sdl_family = AF_LINK;
-
- dst = getaddr(host);
- if (dst == NULL)
- return (1);
- doing_proxy = flags = proxy_only = expire_time = 0;
- while (argc-- > 0) {
- if (strncmp(argv[0], "temp", 4) == 0) {
- 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 = 1;
- if (argc && strncmp(argv[1], "only", 3) == 0) {
- proxy_only = 1;
- argc--; argv++;
- }
- } else if (strncmp(argv[0], "blackhole", 9) == 0) {
- if (flags & RTF_REJECT) {
- printf("Choose one of blackhole or reject, not both.\n");
- }
- flags |= RTF_BLACKHOLE;
- } else if (strncmp(argv[0], "reject", 6) == 0) {
- if (flags & RTF_BLACKHOLE) {
- printf("Choose one of blackhole or reject, not both.\n");
- }
- flags |= RTF_REJECT;
- } else if (strncmp(argv[0], "trail", 5) == 0) {
- /* XXX deprecated and undocumented feature */
- 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(dst->sin_addr.s_addr, ea)) {
- printf("no interface found for %s\n",
- inet_ntoa(dst->sin_addr));
- return (1);
- }
- sdl_m.sdl_alen = ETHER_ADDR_LEN;
- } else {
- struct ether_addr *ea1 = ether_aton(eaddr);
-
- if (ea1 == NULL) {
- warnx("invalid Ethernet address '%s'", eaddr);
- return (1);
- } else {
- *ea = *ea1;
- sdl_m.sdl_alen = ETHER_ADDR_LEN;
- }
- }
-
- /*
- * In the case a proxy-arp entry is being added for
- * a remote end point, the RTF_ANNOUNCE flag in the
- * RTM_GET command is an indication to the kernel
- * routing code that the interface associated with
- * the prefix route covering the local end of the
- * PPP link should be returned, on which ARP applies.
- */
- rtm = rtmsg(RTM_GET, dst, &sdl_m);
- if (rtm == NULL) {
- warn("%s", host);
- return (1);
- }
- addr = (struct sockaddr_inarp *)(rtm + 1);
- sdl = (struct sockaddr_dl *)(SA_SIZE(addr) + (char *)addr);
- if (addr->sin_addr.s_addr == dst->sin_addr.s_addr) {
- printf("set: proxy entry exists for non 802 device\n");
- return (1);
- }
-
- if ((sdl->sdl_family != AF_LINK) ||
- (rtm->rtm_flags & RTF_GATEWAY) ||
- !valid_type(sdl->sdl_type)) {
- printf("cannot intuit interface index and type for %s\n", host);
- return (1);
- }
- sdl_m.sdl_type = sdl->sdl_type;
- sdl_m.sdl_index = sdl->sdl_index;
- return (rtmsg(RTM_ADD, dst, &sdl_m) == NULL);
-}
-
-/*
- * Display an individual arp entry
- */
-static int
-get(char *host)
-{
- struct sockaddr_inarp *addr;
-
- addr = getaddr(host);
- if (addr == NULL)
- return (1);
- if (0 == search(addr->sin_addr.s_addr, print_entry)) {
- printf("%s (%s) -- no entry",
- host, inet_ntoa(addr->sin_addr));
- if (rifname)
- printf(" on %s", rifname);
- printf("\n");
- return (1);
- }
- return (0);
-}
-
-/*
- * Delete an arp entry
- */
-static int
-delete(char *host, int do_proxy)
-{
- struct sockaddr_inarp *addr, *dst;
- struct rt_msghdr *rtm;
- struct sockaddr_dl *sdl;
- struct sockaddr_dl sdl_m;
-
- dst = getaddr(host);
- if (dst == NULL)
- return (1);
-
- /*
- * Perform a regular entry delete first.
- */
- flags &= ~RTF_ANNOUNCE;
-
- /*
- * setup the data structure to notify the kernel
- * it is the ARP entry the RTM_GET is interested
- * in
- */
- bzero(&sdl_m, sizeof(sdl_m));
- sdl_m.sdl_len = sizeof(sdl_m);
- sdl_m.sdl_family = AF_LINK;
-
- for (;;) { /* try twice */
- rtm = rtmsg(RTM_GET, dst, &sdl_m);
- if (rtm == NULL) {
- warn("%s", host);
- return (1);
- }
- addr = (struct sockaddr_inarp *)(rtm + 1);
- sdl = (struct sockaddr_dl *)(SA_SIZE(addr) + (char *)addr);
-
- /*
- * With the new L2/L3 restructure, the route
- * returned is a prefix route. The important
- * piece of information from the previous
- * RTM_GET is the interface index. In the
- * case of ECMP, the kernel will traverse
- * the route group for the given entry.
- */
- if (sdl->sdl_family == AF_LINK &&
- !(rtm->rtm_flags & RTF_GATEWAY) &&
- valid_type(sdl->sdl_type) ) {
- addr->sin_addr.s_addr = dst->sin_addr.s_addr;
- break;
- }
-
- /*
- * Regualar entry delete failed, now check if there
- * is a proxy-arp entry to remove.
- */
- if (flags & RTF_ANNOUNCE) {
- fprintf(stderr, "delete: cannot locate %s\n",host);
- return (1);
- }
-
- flags |= RTF_ANNOUNCE;
- }
- rtm->rtm_flags |= RTF_LLDATA;
- if (rtmsg(RTM_DELETE, dst, NULL) != NULL) {
- printf("%s (%s) deleted\n", host, inet_ntoa(addr->sin_addr));
- return (0);
- }
- return (1);
-}
-
-
-/*
- * Search the arp table and do some action on matching entries
- */
-static int
-search(u_long addr, action_fn *action)
-{
- int mib[6];
- size_t needed;
- char *lim, *buf, *next;
- struct rt_msghdr *rtm;
- struct sockaddr_inarp *sin2;
- struct sockaddr_dl *sdl;
- char ifname[IF_NAMESIZE];
- int st, found_entry = 0;
-
- mib[0] = CTL_NET;
- mib[1] = PF_ROUTE;
- mib[2] = 0;
- mib[3] = AF_INET;
- mib[4] = NET_RT_FLAGS;
-#ifdef RTF_LLINFO
- mib[5] = RTF_LLINFO;
-#else
- mib[5] = 0;
-#endif
- if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
- err(1, "route-sysctl-estimate");
- if (needed == 0) /* empty table */
- return 0;
- buf = NULL;
- for (;;) {
- buf = reallocf(buf, needed);
- if (buf == NULL)
- errx(1, "could not reallocate memory");
- st = sysctl(mib, 6, buf, &needed, NULL, 0);
- if (st == 0 || errno != ENOMEM)
- break;
- needed += needed / 8;
- }
- if (st == -1)
- err(1, "actual retrieval of routing table");
- lim = buf + needed;
- for (next = buf; next < lim; next += rtm->rtm_msglen) {
- rtm = (struct rt_msghdr *)next;
- sin2 = (struct sockaddr_inarp *)(rtm + 1);
- sdl = (struct sockaddr_dl *)((char *)sin2 + SA_SIZE(sin2));
- if (rifname && if_indextoname(sdl->sdl_index, ifname) &&
- strcmp(ifname, rifname))
- continue;
- if (addr) {
- if (addr != sin2->sin_addr.s_addr)
- continue;
- found_entry = 1;
- }
- (*action)(sdl, sin2, rtm);
- }
- free(buf);
- return (found_entry);
-}
-
-/*
- * Display an arp entry
- */
-static char lifname[IF_NAMESIZE];
-static int64_t lifindex = -1;
-
-static void
-print_entry(struct sockaddr_dl *sdl,
- struct sockaddr_inarp *addr, struct rt_msghdr *rtm)
-{
- const char *host;
- struct hostent *hp;
- struct iso88025_sockaddr_dl_data *trld;
- 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) {
- if ((sdl->sdl_type == IFT_ETHER ||
- sdl->sdl_type == IFT_L2VLAN ||
- sdl->sdl_type == IFT_BRIDGE) &&
- sdl->sdl_alen == ETHER_ADDR_LEN)
- printf("%s", ether_ntoa((struct ether_addr *)LLADDR(sdl)));
- else {
- int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0;
-
- printf("%s", link_ntoa(sdl) + n);
- }
- } else
- printf("(incomplete)");
- if (sdl->sdl_index != lifindex &&
- if_indextoname(sdl->sdl_index, lifname) != NULL) {
- lifindex = sdl->sdl_index;
- printf(" on %s", lifname);
- } else if (sdl->sdl_index == lifindex)
- printf(" on %s", lifname);
- if (rtm->rtm_rmx.rmx_expire == 0)
- printf(" permanent");
- else {
- static struct timeval tv;
- if (tv.tv_sec == 0)
- gettimeofday(&tv, 0);
- if ((expire_time = rtm->rtm_rmx.rmx_expire - tv.tv_sec) > 0)
- printf(" expires in %d seconds", (int)expire_time);
- else
- printf(" expired");
- }
- if (addr->sin_other & SIN_PROXY)
- printf(" published (proxy only)");
- if (rtm->rtm_flags & RTF_ANNOUNCE)
- printf(" published");
- switch(sdl->sdl_type) {
- case IFT_ETHER:
- printf(" [ethernet]");
- break;
- case IFT_ISO88025:
- 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])));
- }
- break;
- case IFT_FDDI:
- printf(" [fddi]");
- break;
- case IFT_ATM:
- printf(" [atm]");
- break;
- case IFT_L2VLAN:
- printf(" [vlan]");
- break;
- case IFT_IEEE1394:
- printf(" [firewire]");
- break;
- case IFT_BRIDGE:
- printf(" [bridge]");
- break;
- default:
- break;
- }
-
- printf("\n");
-
-}
-
-/*
- * Nuke an arp entry
- */
-static void
-nuke_entry(struct sockaddr_dl *sdl __unused,
- struct sockaddr_inarp *addr, struct rt_msghdr *rtm __unused)
-{
- char ip[20];
-
- snprintf(ip, sizeof(ip), "%s", inet_ntoa(addr->sin_addr));
- (void)delete(ip, 0);
-}
-
-static void
-usage(void)
-{
- fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
- "usage: arp [-n] [-i interface] hostname",
- " arp [-n] [-i interface] -a",
- " arp -d hostname [pub]",
- " arp -d [-i interface] -a",
- " arp -s hostname ether_addr [temp] [reject | blackhole] [pub [only]]",
- " arp -S hostname ether_addr [temp] [reject | blackhole] [pub [only]]",
- " arp -f filename");
- exit(1);
-}
-
-static struct rt_msghdr *
-rtmsg(int cmd, struct sockaddr_inarp *dst, struct sockaddr_dl *sdl)
-{
- static int seq;
- int rlen;
- int l;
- struct sockaddr_in so_mask, *som = &so_mask;
- static int s = -1;
- static pid_t pid;
-
- static struct {
- struct rt_msghdr m_rtm;
- char m_space[512];
- } m_rtmsg;
-
- struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
- char *cp = m_rtmsg.m_space;
-
- if (s < 0) { /* first time: open socket, get pid */
- s = socket(PF_ROUTE, SOCK_RAW, 0);
- if (s < 0)
- err(1, "socket");
- pid = getpid();
- }
- bzero(&so_mask, sizeof(so_mask));
- so_mask.sin_len = 8;
- so_mask.sin_addr.s_addr = 0xffffffff;
-
- errno = 0;
- /*
- * XXX RTM_DELETE relies on a previous RTM_GET to fill the buffer
- * appropriately.
- */
- if (cmd == RTM_DELETE)
- goto doit;
- bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
- rtm->rtm_flags = flags;
- rtm->rtm_version = RTM_VERSION;
-
- switch (cmd) {
- default:
- errx(1, "internal wrong cmd");
- case RTM_ADD:
- rtm->rtm_addrs |= RTA_GATEWAY;
- rtm->rtm_rmx.rmx_expire = expire_time;
- rtm->rtm_inits = RTV_EXPIRE;
- rtm->rtm_flags |= (RTF_HOST | RTF_STATIC | RTF_LLDATA);
- dst->sin_other = 0;
- if (doing_proxy) {
- if (proxy_only)
- dst->sin_other = SIN_PROXY;
- else {
- rtm->rtm_addrs |= RTA_NETMASK;
- rtm->rtm_flags &= ~RTF_HOST;
- }
- }
- /* FALLTHROUGH */
- case RTM_GET:
- rtm->rtm_addrs |= RTA_DST;
- }
-#define NEXTADDR(w, s) \
- do { \
- if ((s) != NULL && rtm->rtm_addrs & (w)) { \
- bcopy((s), cp, sizeof(*(s))); \
- cp += SA_SIZE(s); \
- } \
- } while (0)
-
- NEXTADDR(RTA_DST, dst);
- NEXTADDR(RTA_GATEWAY, sdl);
- NEXTADDR(RTA_NETMASK, som);
-
- rtm->rtm_msglen = cp - (char *)&m_rtmsg;
-doit:
- l = rtm->rtm_msglen;
- rtm->rtm_seq = ++seq;
- rtm->rtm_type = cmd;
- if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
- if (errno != ESRCH || cmd != RTM_DELETE) {
- warn("writing to routing socket");
- return (NULL);
- }
- }
- 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");
- return (rtm);
-}
-
-/*
- * get_ether_addr - get the hardware address of an interface on the
- * the same subnet as ipaddr.
- */
-#define MAX_IFS 32
-
-static int
-get_ether_addr(in_addr_t ipaddr, struct ether_addr *hwaddr)
-{
- struct ifreq *ifr, *ifend, *ifp;
- in_addr_t ina, mask;
- struct sockaddr_dl *dla;
- struct ifreq ifreq;
- struct ifconf ifc;
- struct ifreq ifs[MAX_IFS];
- int sock;
- int retval = 0;
-
- 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)");
- goto done;
- }
-
-#define NEXTIFR(i) \
- ((struct ifreq *)((char *)&(i)->ifr_addr \
- + MAX((i)->ifr_addr.sa_len, sizeof((i)->ifr_addr))) )
-
- /*
- * 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; ifr = NEXTIFR(ifr) ) {
- if (ifr->ifr_addr.sa_family != AF_INET)
- continue;
- strncpy(ifreq.ifr_name, ifr->ifr_name,
- sizeof(ifreq.ifr_name));
- ifreq.ifr_addr = ifr->ifr_addr;
- /*
- * 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))
- continue;
- /*
- * 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;
- ina = ((struct sockaddr_in *)
- &ifr->ifr_addr)->sin_addr.s_addr;
- if ((ipaddr & mask) == (ina & mask))
- break; /* ok, we got it! */
- }
-
- if (ifr >= ifend)
- goto done;
-
- /*
- * Now scan through again looking for a link-level address
- * for this interface.
- */
- ifp = ifr;
- for (ifr = ifc.ifc_req; ifr < ifend; ifr = NEXTIFR(ifr))
- if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0 &&
- ifr->ifr_addr.sa_family == AF_LINK)
- break;
- if (ifr >= ifend)
- goto done;
- /*
- * Found the link-level address - copy it out
- */
- dla = (struct sockaddr_dl *) &ifr->ifr_addr;
- memcpy(hwaddr, LLADDR(dla), dla->sdl_alen);
- printf("using interface %s for proxy with address ",
- ifp->ifr_name);
- printf("%s\n", ether_ntoa(hwaddr));
- retval = dla->sdl_alen;
-done:
- close(sock);
- return (retval);
-}
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