diff options
Diffstat (limited to 'libexec/bootpd/rtmsg.c')
-rw-r--r-- | libexec/bootpd/rtmsg.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/libexec/bootpd/rtmsg.c b/libexec/bootpd/rtmsg.c new file mode 100644 index 0000000..fb59afe --- /dev/null +++ b/libexec/bootpd/rtmsg.c @@ -0,0 +1,236 @@ +/* + * Copyright (c) 1984, 1993 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1994 + * Geoffrey M. Rehmet, All rights reserved. + * + * This code is derived from software which forms part of the 4.4-Lite + * Berkeley software distribution, which was in 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 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. + */ + +/* + * from arp.c 8.2 (Berkeley) 1/2/94 + * $Id: rtmsg.c,v 1.2 1994/09/10 15:13:28 csgr Exp $ + */ + +#include <sys/param.h> +/* + * Verify that we are at least 4.4 BSD + */ +#if defined(BSD) +#if BSD >= 199306 + +#include <sys/socket.h> + +#include <net/if.h> +#include <net/if_dl.h> +#include <net/if_types.h> +#include <net/route.h> + +#include <netinet/in.h> +#include <netinet/if_ether.h> + +#include <arpa/inet.h> + +#include <errno.h> +#include <stdio.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> + +#include "report.h" + + +static int rtmsg __P((int)); + +static int s = -1; /* routing socket */ + + +/* + * Open the routing socket + */ +static void getsocket () { + if (s < 0) { + s = socket(PF_ROUTE, SOCK_RAW, 0); + if (s < 0) { + report(LOG_ERR, "socket %s", strerror(errno)); + exit(1); + } + } +} + +static struct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}}; +static struct sockaddr_inarp blank_sin = {sizeof(blank_sin), AF_INET }, sin_m; +static struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m; +static int expire_time, flags, export_only, doing_proxy; +static struct { + struct rt_msghdr m_rtm; + char m_space[512]; +} m_rtmsg; + +/* + * Set an individual arp entry + */ +int bsd_arp_set(ia, eaddr, len) + struct in_addr *ia; + char *eaddr; + int len; +{ + register struct sockaddr_inarp *sin = &sin_m; + register struct sockaddr_dl *sdl; + register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm); + u_char *ea; + struct timeval time; + + getsocket(); + sdl_m = blank_sdl; + sin_m = blank_sin; + sin->sin_addr = *ia; + + ea = (u_char *)LLADDR(&sdl_m); + bcopy(eaddr, ea, len); + sdl_m.sdl_alen = len; + doing_proxy = flags = export_only = expire_time = 0; + + /* make arp entry temporary */ + gettimeofday(&time, 0); + expire_time = time.tv_sec + 20 * 60; + +tryagain: + if (rtmsg(RTM_GET) < 0) { + report(LOG_WARNING, "rtmget: %s", strerror(errno)); + 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) { + 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: + goto overwrite; + } + if (doing_proxy == 0) { + report(LOG_WARNING, "set: can only proxy for %s\n", + inet_ntoa(sin->sin_addr)); + return (1); + } + if (sin_m.sin_other & SIN_PROXY) { + report(LOG_WARNING, + "set: proxy entry exists for non 802 device\n"); + return(1); + } + sin_m.sin_other = SIN_PROXY; + export_only = 1; + goto tryagain; + } +overwrite: + if (sdl->sdl_family != AF_LINK) { + report(LOG_WARNING, + "cannot intuit interface index and type for %s\n", + inet_ntoa(sin->sin_addr)); + return (1); + } + sdl_m.sdl_type = sdl->sdl_type; + sdl_m.sdl_index = sdl->sdl_index; + return (rtmsg(RTM_ADD)); +} + + +static int rtmsg(cmd) + int cmd; +{ + static int seq; + int rlen; + register struct rt_msghdr *rtm = &m_rtmsg.m_rtm; + register char *cp = m_rtmsg.m_space; + register int l; + + errno = 0; + bzero((char *)&m_rtmsg, sizeof(m_rtmsg)); + rtm->rtm_flags = flags; + rtm->rtm_version = RTM_VERSION; + + switch (cmd) { + default: + report(LOG_ERR, "set_arp: internal wrong cmd - exiting"); + exit(1); + 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); + sin_m.sin_other = 0; + if (doing_proxy) { + if (export_only) + sin_m.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) \ + if (rtm->rtm_addrs & (w)) { \ + bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);} + + NEXTADDR(RTA_DST, sin_m); + NEXTADDR(RTA_GATEWAY, sdl_m); + NEXTADDR(RTA_NETMASK, so_mask); + + rtm->rtm_msglen = cp - (char *)&m_rtmsg; + + l = rtm->rtm_msglen; + rtm->rtm_seq = ++seq; + rtm->rtm_type = cmd; + if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) { + if ((errno != ESRCH) && !(errno == EEXIST && cmd == RTM_ADD)){ + report(LOG_WARNING, "writing to routing socket: %s", + strerror(errno)); + return (-1); + } + } + do { + l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); + } while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != getpid())); + if (l < 0) + report(LOG_WARNING, "arp: read from routing socket: %s\n", + strerror(errno)); + return (0); +} + +#endif /* BSD */ +#endif /* BSD >= 199306 */ |