13229Spst/* 23229Spst * Copyright (c) 1984, 1993 33229Spst * The Regents of the University of California. All rights reserved. 43229Spst * Copyright (c) 1994 53229Spst * Geoffrey M. Rehmet, All rights reserved. 63229Spst * 73229Spst * This code is derived from software which forms part of the 4.4-Lite 83229Spst * Berkeley software distribution, which was in derived from software 93229Spst * contributed to Berkeley by Sun Microsystems, Inc. 103229Spst * 113229Spst * Redistribution and use in source and binary forms, with or without 123229Spst * modification, are permitted provided that the following conditions 133229Spst * are met: 143229Spst * 1. Redistributions of source code must retain the above copyright 153229Spst * notice, this list of conditions and the following disclaimer. 163229Spst * 2. Redistributions in binary form must reproduce the above copyright 173229Spst * notice, this list of conditions and the following disclaimer in the 183229Spst * documentation and/or other materials provided with the distribution. 193229Spst * 3. All advertising materials mentioning features or use of this software 203229Spst * must display the following acknowledgement: 213229Spst * This product includes software developed by the University of 223229Spst * California, Berkeley and its contributors. 233229Spst * 4. Neither the name of the University nor the names of its contributors 243229Spst * may be used to endorse or promote products derived from this software 253229Spst * without specific prior written permission. 263229Spst * 273229Spst * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 283229Spst * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 293229Spst * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 303229Spst * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 313229Spst * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 323229Spst * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 333229Spst * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 343229Spst * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 353229Spst * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 363229Spst * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 373229Spst * SUCH DAMAGE. 383229Spst */ 393229Spst 403229Spst/* 413229Spst * from arp.c 8.2 (Berkeley) 1/2/94 423229Spst */ 433229Spst 44110395Scharnier#include <sys/cdefs.h> 45110395Scharnier__FBSDID("$FreeBSD$"); 46110395Scharnier 473229Spst#include <sys/param.h> 483229Spst/* 493229Spst * Verify that we are at least 4.4 BSD 503229Spst */ 513229Spst#if defined(BSD) 523229Spst#if BSD >= 199306 533229Spst 543229Spst#include <sys/socket.h> 556034Sdfr#include <sys/filio.h> 5620287Swollman#include <sys/time.h> 573229Spst 583229Spst#include <net/if.h> 593229Spst#include <net/if_dl.h> 603229Spst#include <net/if_types.h> 613229Spst#include <net/route.h> 623229Spst 633229Spst#include <netinet/in.h> 643229Spst#include <netinet/if_ether.h> 653229Spst 663229Spst#include <arpa/inet.h> 673229Spst 683229Spst#include <errno.h> 693229Spst#include <stdio.h> 70110395Scharnier#include <stdlib.h> 713229Spst#include <string.h> 723229Spst#include <syslog.h> 733229Spst#include <unistd.h> 743229Spst 753229Spst#include "report.h" 763229Spst 773229Spst 78104742Salfredstatic int rtmsg(int); 793229Spst 803229Spststatic int s = -1; /* routing socket */ 813229Spst 823229Spst 833229Spst/* 843229Spst * Open the routing socket 853229Spst */ 863229Spststatic void getsocket () { 873229Spst if (s < 0) { 883229Spst s = socket(PF_ROUTE, SOCK_RAW, 0); 893229Spst if (s < 0) { 903229Spst report(LOG_ERR, "socket %s", strerror(errno)); 913229Spst exit(1); 923229Spst } 936034Sdfr } else { 946034Sdfr /* 956034Sdfr * Drain the socket of any unwanted routing messages. 966034Sdfr */ 976034Sdfr int n; 986034Sdfr char buf[512]; 996034Sdfr 1006034Sdfr ioctl(s, FIONREAD, &n); 1016034Sdfr while (n > 0) { 1026034Sdfr read(s, buf, sizeof buf); 1036034Sdfr ioctl(s, FIONREAD, &n); 1046034Sdfr } 1053229Spst } 1063229Spst} 1073229Spst 1083229Spststatic struct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}}; 109246143Sglebiusstatic struct sockaddr_in blank_sin = {sizeof(blank_sin), AF_INET }, sin_m; 1103229Spststatic struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m; 111246143Sglebiusstatic int expire_time, flags, doing_proxy; 1123229Spststatic struct { 1133229Spst struct rt_msghdr m_rtm; 1143229Spst char m_space[512]; 1153229Spst} m_rtmsg; 1163229Spst 1173229Spst/* 1188870Srgrimes * Set an individual arp entry 1193229Spst */ 1203229Spstint bsd_arp_set(ia, eaddr, len) 1213229Spst struct in_addr *ia; 1223229Spst char *eaddr; 1233229Spst int len; 1243229Spst{ 125246143Sglebius register struct sockaddr_in *sin = &sin_m; 1263229Spst register struct sockaddr_dl *sdl; 1273229Spst register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm); 1283229Spst u_char *ea; 129216226Sglebius struct timespec tp; 1305661Sdfr int op = RTM_ADD; 1313229Spst 1323229Spst getsocket(); 1333229Spst sdl_m = blank_sdl; 1343229Spst sin_m = blank_sin; 1353229Spst sin->sin_addr = *ia; 1363229Spst 1373229Spst ea = (u_char *)LLADDR(&sdl_m); 1383229Spst bcopy(eaddr, ea, len); 1393229Spst sdl_m.sdl_alen = len; 140246143Sglebius doing_proxy = flags = expire_time = 0; 1413229Spst 1423229Spst /* make arp entry temporary */ 143216226Sglebius clock_gettime(CLOCK_MONOTONIC, &tp); 144216226Sglebius expire_time = tp.tv_sec + 20 * 60; 1453229Spst 1463229Spsttryagain: 1473229Spst if (rtmsg(RTM_GET) < 0) { 1483229Spst report(LOG_WARNING, "rtmget: %s", strerror(errno)); 1493229Spst return (1); 1503229Spst } 151246143Sglebius sin = (struct sockaddr_in *)(rtm + 1); 1523229Spst sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin); 1533229Spst if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) { 1543229Spst if (sdl->sdl_family == AF_LINK && 1553229Spst !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) { 1563229Spst case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023: 1573229Spst case IFT_ISO88024: case IFT_ISO88025: 1585661Sdfr op = RTM_CHANGE; 1593229Spst goto overwrite; 1603229Spst } 1613229Spst if (doing_proxy == 0) { 1628870Srgrimes report(LOG_WARNING, "set: can only proxy for %s\n", 1633229Spst inet_ntoa(sin->sin_addr)); 1643229Spst return (1); 1653229Spst } 1663229Spst goto tryagain; 1673229Spst } 1683229Spstoverwrite: 1693229Spst if (sdl->sdl_family != AF_LINK) { 1703229Spst report(LOG_WARNING, 1718870Srgrimes "cannot intuit interface index and type for %s\n", 1723229Spst inet_ntoa(sin->sin_addr)); 1733229Spst return (1); 1743229Spst } 1753229Spst sdl_m.sdl_type = sdl->sdl_type; 1763229Spst sdl_m.sdl_index = sdl->sdl_index; 1775661Sdfr return (rtmsg(op)); 1783229Spst} 1793229Spst 1803229Spst 1813229Spststatic int rtmsg(cmd) 1823229Spst int cmd; 1833229Spst{ 1843229Spst static int seq; 1853229Spst int rlen; 1863229Spst register struct rt_msghdr *rtm = &m_rtmsg.m_rtm; 1873229Spst register char *cp = m_rtmsg.m_space; 1883229Spst register int l; 1893229Spst 1903229Spst errno = 0; 1913229Spst bzero((char *)&m_rtmsg, sizeof(m_rtmsg)); 1923229Spst rtm->rtm_flags = flags; 1933229Spst rtm->rtm_version = RTM_VERSION; 1943229Spst 1953229Spst switch (cmd) { 1963229Spst default: 1973229Spst report(LOG_ERR, "set_arp: internal wrong cmd - exiting"); 1983229Spst exit(1); 1993229Spst case RTM_ADD: 2005661Sdfr case RTM_CHANGE: 2013229Spst rtm->rtm_addrs |= RTA_GATEWAY; 2023229Spst rtm->rtm_rmx.rmx_expire = expire_time; 2033229Spst rtm->rtm_inits = RTV_EXPIRE; 204190601Scognet rtm->rtm_flags |= (RTF_HOST | RTF_STATIC | RTF_LLDATA); 2053229Spst if (doing_proxy) { 206246143Sglebius rtm->rtm_addrs |= RTA_NETMASK; 207246143Sglebius rtm->rtm_flags &= ~RTF_HOST; 2083229Spst } 2093229Spst /* FALLTHROUGH */ 2103229Spst case RTM_GET: 2113229Spst rtm->rtm_addrs |= RTA_DST; 2123229Spst } 2133229Spst#define NEXTADDR(w, s) \ 2143229Spst if (rtm->rtm_addrs & (w)) { \ 2153229Spst bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);} 2163229Spst 2173229Spst NEXTADDR(RTA_DST, sin_m); 2183229Spst NEXTADDR(RTA_GATEWAY, sdl_m); 2193229Spst NEXTADDR(RTA_NETMASK, so_mask); 2203229Spst 2213229Spst rtm->rtm_msglen = cp - (char *)&m_rtmsg; 2223229Spst 2233229Spst l = rtm->rtm_msglen; 2243229Spst rtm->rtm_seq = ++seq; 2253229Spst rtm->rtm_type = cmd; 2263229Spst if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) { 2273229Spst if ((errno != ESRCH) && !(errno == EEXIST && cmd == RTM_ADD)){ 2283229Spst report(LOG_WARNING, "writing to routing socket: %s", 2293229Spst strerror(errno)); 2303229Spst return (-1); 2313229Spst } 2323229Spst } 2333229Spst do { 2343229Spst l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); 2356034Sdfr } while (l > 0 && (rtm->rtm_type != cmd || rtm->rtm_seq != seq || rtm->rtm_pid != getpid())); 2363229Spst if (l < 0) 2373229Spst report(LOG_WARNING, "arp: read from routing socket: %s\n", 2383229Spst strerror(errno)); 2393229Spst return (0); 2403229Spst} 2413229Spst 2423229Spst#endif /* BSD */ 2433229Spst#endif /* BSD >= 199306 */ 244