578 lines
15 KiB
C
578 lines
15 KiB
C
/*
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* PPP Routing related Module
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1994, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: route.c,v 1.41 1998/01/19 02:59:33 brian Exp $
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*
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <net/if_dl.h>
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#include <errno.h>
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#include <machine/endian.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <unistd.h>
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#include "command.h"
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#include "mbuf.h"
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#include "log.h"
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#include "loadalias.h"
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#include "defs.h"
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#include "vars.h"
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#include "id.h"
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#include "os.h"
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#include "ipcp.h"
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#include "iplist.h"
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#include "route.h"
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static int IfIndex;
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struct rtmsg {
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struct rt_msghdr m_rtm;
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char m_space[64];
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};
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static int seqno;
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void
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OsSetRoute(int cmd,
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struct in_addr dst,
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struct in_addr gateway,
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struct in_addr mask,
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int bang)
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{
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struct rtmsg rtmes;
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int s, nb, wb;
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char *cp;
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const char *cmdstr;
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struct sockaddr_in rtdata;
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if (bang)
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cmdstr = (cmd == RTM_ADD ? "Add!" : "Delete!");
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else
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cmdstr = (cmd == RTM_ADD ? "Add" : "Delete");
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s = ID0socket(PF_ROUTE, SOCK_RAW, 0);
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if (s < 0) {
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LogPrintf(LogERROR, "OsSetRoute: socket(): %s\n", strerror(errno));
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return;
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}
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memset(&rtmes, '\0', sizeof rtmes);
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rtmes.m_rtm.rtm_version = RTM_VERSION;
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rtmes.m_rtm.rtm_type = cmd;
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rtmes.m_rtm.rtm_addrs = RTA_DST;
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rtmes.m_rtm.rtm_seq = ++seqno;
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rtmes.m_rtm.rtm_pid = getpid();
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rtmes.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
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memset(&rtdata, '\0', sizeof rtdata);
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rtdata.sin_len = 16;
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rtdata.sin_family = AF_INET;
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rtdata.sin_port = 0;
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rtdata.sin_addr = dst;
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cp = rtmes.m_space;
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memcpy(cp, &rtdata, 16);
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cp += 16;
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if (cmd == RTM_ADD)
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if (gateway.s_addr == INADDR_ANY) {
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/* Add a route through the interface */
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struct sockaddr_dl dl;
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const char *iname;
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int ilen;
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iname = Index2Nam(IfIndex);
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ilen = strlen(iname);
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dl.sdl_len = sizeof dl - sizeof dl.sdl_data + ilen;
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dl.sdl_family = AF_LINK;
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dl.sdl_index = IfIndex;
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dl.sdl_type = 0;
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dl.sdl_nlen = ilen;
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dl.sdl_alen = 0;
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dl.sdl_slen = 0;
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strncpy(dl.sdl_data, iname, sizeof dl.sdl_data);
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memcpy(cp, &dl, dl.sdl_len);
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cp += dl.sdl_len;
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rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY;
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} else {
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rtdata.sin_addr = gateway;
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memcpy(cp, &rtdata, 16);
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cp += 16;
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rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY;
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}
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if (dst.s_addr == INADDR_ANY)
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mask.s_addr = INADDR_ANY;
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if (cmd == RTM_ADD || dst.s_addr == INADDR_ANY) {
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rtdata.sin_addr = mask;
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memcpy(cp, &rtdata, 16);
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cp += 16;
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rtmes.m_rtm.rtm_addrs |= RTA_NETMASK;
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}
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nb = cp - (char *) &rtmes;
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rtmes.m_rtm.rtm_msglen = nb;
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wb = ID0write(s, &rtmes, nb);
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if (wb < 0) {
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LogPrintf(LogTCPIP, "OsSetRoute failure:\n");
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LogPrintf(LogTCPIP, "OsSetRoute: Cmd = %s\n", cmd);
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LogPrintf(LogTCPIP, "OsSetRoute: Dst = %s\n", inet_ntoa(dst));
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LogPrintf(LogTCPIP, "OsSetRoute: Gateway = %s\n", inet_ntoa(gateway));
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LogPrintf(LogTCPIP, "OsSetRoute: Mask = %s\n", inet_ntoa(mask));
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failed:
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if (cmd == RTM_ADD && (rtmes.m_rtm.rtm_errno == EEXIST ||
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(rtmes.m_rtm.rtm_errno == 0 && errno == EEXIST)))
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if (!bang)
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LogPrintf(LogWARN, "Add route failed: %s already exists\n",
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inet_ntoa(dst));
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else {
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rtmes.m_rtm.rtm_type = cmd = RTM_CHANGE;
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if ((wb = ID0write(s, &rtmes, nb)) < 0)
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goto failed;
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}
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else if (cmd == RTM_DELETE &&
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(rtmes.m_rtm.rtm_errno == ESRCH ||
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(rtmes.m_rtm.rtm_errno == 0 && errno == ESRCH))) {
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if (!bang)
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LogPrintf(LogWARN, "Del route failed: %s: Non-existent\n",
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inet_ntoa(dst));
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} else if (rtmes.m_rtm.rtm_errno == 0)
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LogPrintf(LogWARN, "%s route failed: %s: errno: %s\n", cmdstr,
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inet_ntoa(dst), strerror(errno));
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else
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LogPrintf(LogWARN, "%s route failed: %s: %s\n",
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cmdstr, inet_ntoa(dst), strerror(rtmes.m_rtm.rtm_errno));
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}
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LogPrintf(LogDEBUG, "wrote %d: cmd = %s, dst = %x, gateway = %x\n",
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wb, cmdstr, dst.s_addr, gateway.s_addr);
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close(s);
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}
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static void
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p_sockaddr(struct sockaddr *phost, struct sockaddr *pmask, int width)
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{
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char buf[29];
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struct sockaddr_in *ihost = (struct sockaddr_in *)phost;
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struct sockaddr_in *mask = (struct sockaddr_in *)pmask;
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struct sockaddr_dl *dl = (struct sockaddr_dl *)phost;
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switch (phost->sa_family) {
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case AF_INET:
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if (!phost)
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buf[0] = '\0';
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else if (ihost->sin_addr.s_addr == INADDR_ANY)
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strcpy(buf, "default");
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else if (!mask)
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strcpy(buf, inet_ntoa(ihost->sin_addr));
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else {
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u_int msk = ntohl(mask->sin_addr.s_addr);
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u_int tst;
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int bits;
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int len;
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struct sockaddr_in net;
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for (tst = 1, bits=32; tst; tst <<= 1, bits--)
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if (msk & tst)
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break;
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for (tst <<=1; tst; tst <<= 1)
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if (!(msk & tst))
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break;
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net.sin_addr.s_addr = ihost->sin_addr.s_addr & mask->sin_addr.s_addr;
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strcpy(buf, inet_ntoa(net.sin_addr));
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for (len = strlen(buf); len > 3; buf[len-=2] = '\0')
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if (strcmp(buf+len-2, ".0"))
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break;
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if (tst) /* non-contiguous :-( */
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sprintf(buf+strlen(buf),"&0x%08x", msk);
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else
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sprintf(buf+strlen(buf), "/%d", bits);
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}
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break;
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case AF_LINK:
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if (dl->sdl_nlen)
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snprintf(buf, sizeof buf, "%.*s", dl->sdl_nlen, dl->sdl_data);
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else if (dl->sdl_alen)
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if (dl->sdl_type == IFT_ETHER)
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if (dl->sdl_alen < sizeof buf / 3) {
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int f;
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u_char *MAC;
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MAC = (u_char *)dl->sdl_data + dl->sdl_nlen;
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for (f = 0; f < dl->sdl_alen; f++)
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sprintf(buf+f*3, "%02x:", MAC[f]);
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buf[f*3-1] = '\0';
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} else
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strcpy(buf, "??:??:??:??:??:??");
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else
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sprintf(buf, "<IFT type %d>", dl->sdl_type);
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else if (dl->sdl_slen)
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sprintf(buf, "<slen %d?>", dl->sdl_slen);
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else
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sprintf(buf, "link#%d", dl->sdl_index);
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break;
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default:
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sprintf(buf, "<AF type %d>", phost->sa_family);
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break;
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}
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fprintf(VarTerm, "%-*s ", width-1, buf);
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}
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static struct bits {
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u_long b_mask;
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char b_val;
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} bits[] = {
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{ RTF_UP, 'U' },
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{ RTF_GATEWAY, 'G' },
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{ RTF_HOST, 'H' },
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{ RTF_REJECT, 'R' },
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{ RTF_DYNAMIC, 'D' },
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{ RTF_MODIFIED, 'M' },
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{ RTF_DONE, 'd' },
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{ RTF_CLONING, 'C' },
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{ RTF_XRESOLVE, 'X' },
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{ RTF_LLINFO, 'L' },
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{ RTF_STATIC, 'S' },
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{ RTF_PROTO1, '1' },
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{ RTF_PROTO2, '2' },
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{ RTF_BLACKHOLE, 'B' },
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#ifdef RTF_WASCLONED
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{ RTF_WASCLONED, 'W' },
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#endif
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#ifdef RTF_PRCLONING
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{ RTF_PRCLONING, 'c' },
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#endif
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#ifdef RTF_PROTO3
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{ RTF_PROTO3, '3' },
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#endif
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#ifdef RTF_BROADCAST
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{ RTF_BROADCAST, 'b' },
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#endif
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{ 0, '\0' }
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};
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#ifndef RTF_WASCLONED
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#define RTF_WASCLONED (0)
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#endif
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static void
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p_flags(u_long f, int max)
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{
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if (VarTerm) {
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char name[33], *flags;
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register struct bits *p = bits;
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if (max > sizeof name - 1)
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max = sizeof name - 1;
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for (flags = name; p->b_mask && flags - name < max; p++)
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if (p->b_mask & f)
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*flags++ = p->b_val;
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*flags = '\0';
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fprintf(VarTerm, "%-*.*s", max, max, name);
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}
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}
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const char *
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Index2Nam(int idx)
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{
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static char **ifs;
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static int nifs, debug_done;
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if (!nifs) {
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int mib[6], have, had;
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size_t needed;
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char *buf, *ptr, *end;
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struct sockaddr_dl *dl;
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struct if_msghdr *ifm;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = 0;
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mib[4] = NET_RT_IFLIST;
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mib[5] = 0;
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
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LogPrintf(LogERROR, "Index2Nam: sysctl: estimate: %s\n", strerror(errno));
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return "???";
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}
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if ((buf = malloc(needed)) == NULL)
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return "???";
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if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
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free(buf);
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return "???";
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}
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end = buf + needed;
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have = 0;
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for (ptr = buf; ptr < end; ptr += ifm->ifm_msglen) {
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ifm = (struct if_msghdr *)ptr;
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dl = (struct sockaddr_dl *)(ifm + 1);
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if (ifm->ifm_index > 0) {
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if (ifm->ifm_index > have) {
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had = have;
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have = ifm->ifm_index + 5;
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if (had)
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ifs = (char **)realloc(ifs, sizeof(char *) * have);
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else
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ifs = (char **)malloc(sizeof(char *) * have);
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if (!ifs) {
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LogPrintf(LogDEBUG, "Index2Nam: %s\n", strerror(errno));
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nifs = 0;
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return "???";
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}
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memset(ifs + had, '\0', sizeof(char *) * (have - had));
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}
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if (ifs[ifm->ifm_index-1] == NULL) {
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ifs[ifm->ifm_index-1] = (char *)malloc(dl->sdl_nlen+1);
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memcpy(ifs[ifm->ifm_index-1], dl->sdl_data, dl->sdl_nlen);
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ifs[ifm->ifm_index-1][dl->sdl_nlen] = '\0';
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if (nifs < ifm->ifm_index)
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nifs = ifm->ifm_index;
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}
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} else if (LogIsKept(LogDEBUG))
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LogPrintf(LogDEBUG, "Skipping out-of-range interface %d!\n",
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ifm->ifm_index);
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}
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free(buf);
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}
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if (LogIsKept(LogDEBUG) && !debug_done) {
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int f;
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LogPrintf(LogDEBUG, "Found the following interfaces:\n");
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for (f = 0; f < nifs; f++)
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if (ifs[f] != NULL)
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LogPrintf(LogDEBUG, " Index %d, name \"%s\"\n", f+1, ifs[f]);
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debug_done = 1;
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}
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if (idx < 1 || idx > nifs || ifs[idx-1] == NULL)
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return "???";
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return ifs[idx-1];
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}
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int
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ShowRoute(struct cmdargs const *arg)
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{
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struct rt_msghdr *rtm;
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struct sockaddr *sa_dst, *sa_gw, *sa_mask;
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char *sp, *ep, *cp, *wp;
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size_t needed;
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int mib[6];
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if (!VarTerm)
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return 1;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = 0;
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mib[4] = NET_RT_DUMP;
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mib[5] = 0;
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
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LogPrintf(LogERROR, "ShowRoute: sysctl: estimate: %s\n", strerror(errno));
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return (1);
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}
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if (needed < 0)
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return (1);
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sp = malloc(needed);
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if (sp == NULL)
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return (1);
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if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
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LogPrintf(LogERROR, "ShowRoute: sysctl: getroute: %s\n", strerror(errno));
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free(sp);
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return (1);
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}
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ep = sp + needed;
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fprintf(VarTerm, "%-20s%-20sFlags Netif\n", "Destination", "Gateway");
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for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *) cp;
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wp = (char *)(rtm+1);
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if (rtm->rtm_addrs & RTA_DST) {
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sa_dst = (struct sockaddr *)wp;
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wp += sa_dst->sa_len;
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} else
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sa_dst = NULL;
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if (rtm->rtm_addrs & RTA_GATEWAY) {
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sa_gw = (struct sockaddr *)wp;
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wp += sa_gw->sa_len;
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} else
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sa_gw = NULL;
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if (rtm->rtm_addrs & RTA_NETMASK) {
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sa_mask = (struct sockaddr *)wp;
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wp += sa_mask->sa_len;
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} else
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sa_mask = NULL;
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p_sockaddr(sa_dst, sa_mask, 20);
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p_sockaddr(sa_gw, NULL, 20);
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p_flags(rtm->rtm_flags, 6);
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fprintf(VarTerm, " %s\n", Index2Nam(rtm->rtm_index));
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}
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free(sp);
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return 0;
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}
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/*
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* Delete routes associated with our interface
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*/
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void
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DeleteIfRoutes(int all)
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{
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struct rt_msghdr *rtm;
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struct sockaddr *sa;
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struct in_addr sa_dst, sa_none;
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int pass;
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size_t needed;
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char *sp, *cp, *ep;
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int mib[6];
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LogPrintf(LogDEBUG, "DeleteIfRoutes (%d)\n", IfIndex);
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sa_none.s_addr = INADDR_ANY;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = 0;
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mib[4] = NET_RT_DUMP;
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mib[5] = 0;
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
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LogPrintf(LogERROR, "DeleteIfRoutes: sysctl: estimate: %s\n",
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strerror(errno));
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return;
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}
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if (needed < 0)
|
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return;
|
|
|
|
sp = malloc(needed);
|
|
if (sp == NULL)
|
|
return;
|
|
|
|
if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
|
|
LogPrintf(LogERROR, "DeleteIfRoutes: sysctl: getroute: %s\n",
|
|
strerror(errno));
|
|
free(sp);
|
|
return;
|
|
}
|
|
ep = sp + needed;
|
|
|
|
for (pass = 0; pass < 2; pass++) {
|
|
/*
|
|
* We do 2 passes. The first deletes all cloned routes. The second
|
|
* deletes all non-cloned routes. This is necessary to avoid
|
|
* potential errors from trying to delete route X after route Y where
|
|
* route X was cloned from route Y (which is no longer there).
|
|
*/
|
|
if (RTF_WASCLONED == 0 && pass == 0)
|
|
/* So we can't tell ! */
|
|
continue;
|
|
for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
|
|
rtm = (struct rt_msghdr *) cp;
|
|
sa = (struct sockaddr *) (rtm + 1);
|
|
LogPrintf(LogDEBUG, "DeleteIfRoutes: addrs: %x, Netif: %d (%s),"
|
|
" flags: %x, dst: %s ?\n", rtm->rtm_addrs, rtm->rtm_index,
|
|
Index2Nam(rtm->rtm_index), rtm->rtm_flags,
|
|
inet_ntoa(((struct sockaddr_in *) sa)->sin_addr));
|
|
if (rtm->rtm_addrs & RTA_DST && rtm->rtm_addrs & RTA_GATEWAY &&
|
|
rtm->rtm_index == IfIndex &&
|
|
(all || (rtm->rtm_flags & RTF_GATEWAY))) {
|
|
sa_dst.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
|
|
sa = (struct sockaddr *)((char *)sa + sa->sa_len);
|
|
if (sa->sa_family == AF_INET || sa->sa_family == AF_LINK) {
|
|
if ((pass == 0 && (rtm->rtm_flags & RTF_WASCLONED)) ||
|
|
(pass == 1 && !(rtm->rtm_flags & RTF_WASCLONED))) {
|
|
LogPrintf(LogDEBUG, "DeleteIfRoutes: Remove it (pass %d)\n", pass);
|
|
OsSetRoute(RTM_DELETE, sa_dst, sa_none, sa_none, 0);
|
|
} else
|
|
LogPrintf(LogDEBUG, "DeleteIfRoutes: Skip it (pass %d)\n", pass);
|
|
} else
|
|
LogPrintf(LogDEBUG,
|
|
"DeleteIfRoutes: Can't remove routes of %d family !\n",
|
|
sa->sa_family);
|
|
}
|
|
}
|
|
}
|
|
free(sp);
|
|
}
|
|
|
|
int
|
|
GetIfIndex(char *name)
|
|
{
|
|
int idx;
|
|
const char *got;
|
|
|
|
idx = 1;
|
|
while (strcmp(got = Index2Nam(idx), "???"))
|
|
if (!strcmp(got, name))
|
|
return IfIndex = idx;
|
|
else
|
|
idx++;
|
|
return -1;
|
|
}
|
|
|
|
struct in_addr
|
|
ChooseHisAddr(const struct in_addr gw)
|
|
{
|
|
struct in_addr try;
|
|
int f;
|
|
|
|
for (f = 0; f < DefHisChoice.nItems; f++) {
|
|
try = iplist_next(&DefHisChoice);
|
|
LogPrintf(LogDEBUG, "ChooseHisAddr: Check item %d (%s)\n",
|
|
f, inet_ntoa(try));
|
|
if (OsTrySetIpaddress(gw, try) == 0) {
|
|
LogPrintf(LogIPCP, "ChooseHisAddr: Selected IP address %s\n",
|
|
inet_ntoa(try));
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (f == DefHisChoice.nItems) {
|
|
LogPrintf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n");
|
|
try.s_addr = INADDR_ANY;
|
|
}
|
|
|
|
return try;
|
|
}
|