route.c revision 31354 
1/*
2 *	      PPP Routing related Module
3 *
4 *	    Written by Toshiharu OHNO (tony-o@iij.ad.jp)
5 *
6 *   Copyright (C) 1994, Internet Initiative Japan, Inc. All rights reserverd.
7 *
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by the Internet Initiative Japan, Inc.  The name of the
14 * IIJ may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 *
20 * $Id: route.c,v 1.27 1997/11/22 03:37:44 brian Exp $
21 *
22 */
23
24#include <sys/param.h>
25#include <sys/time.h>
26#include <sys/socket.h>
27#include <net/if_types.h>
28#include <net/route.h>
29#include <net/if.h>
30#include <netinet/in_systm.h>
31#include <netinet/in.h>
32#include <arpa/inet.h>
33#include <net/if_dl.h>
34
35#include <errno.h>
36#include <machine/endian.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <sys/ioctl.h>
41#include <sys/sysctl.h>
42#include <unistd.h>
43
44#include "command.h"
45#include "mbuf.h"
46#include "log.h"
47#include "loadalias.h"
48#include "defs.h"
49#include "vars.h"
50#include "id.h"
51#include "route.h"
52
53static int IfIndex;
54
55struct rtmsg {
56  struct rt_msghdr m_rtm;
57  char m_space[64];
58};
59
60static int seqno;
61
62void
63OsSetRoute(int cmd,
64	   struct in_addr dst,
65	   struct in_addr gateway,
66	   struct in_addr mask)
67{
68  struct rtmsg rtmes;
69  int s, nb, wb;
70  char *cp;
71  const char *cmdstr;
72  u_long *lp;
73  struct sockaddr_in rtdata;
74
75  cmdstr = (cmd == RTM_ADD ? "Add" : "Delete");
76  s = ID0socket(PF_ROUTE, SOCK_RAW, 0);
77  if (s < 0) {
78    LogPrintf(LogERROR, "OsSetRoute: socket(): %s\n", strerror(errno));
79    return;
80  }
81  memset(&rtmes, '\0', sizeof(rtmes));
82  rtmes.m_rtm.rtm_version = RTM_VERSION;
83  rtmes.m_rtm.rtm_type = cmd;
84  rtmes.m_rtm.rtm_addrs = RTA_DST | RTA_NETMASK;
85  rtmes.m_rtm.rtm_seq = ++seqno;
86  rtmes.m_rtm.rtm_pid = getpid();
87  rtmes.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
88
89  memset(&rtdata, '\0', sizeof(rtdata));
90  rtdata.sin_len = 16;
91  rtdata.sin_family = AF_INET;
92  rtdata.sin_port = 0;
93  rtdata.sin_addr = dst;
94
95  cp = rtmes.m_space;
96  memcpy(cp, &rtdata, 16);
97  cp += 16;
98  if (gateway.s_addr) {
99    rtdata.sin_addr = gateway;
100    memcpy(cp, &rtdata, 16);
101    cp += 16;
102    rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY;
103  }
104  if (dst.s_addr == INADDR_ANY)
105    mask.s_addr = INADDR_ANY;
106
107  lp = (u_long *) cp;
108
109  if (mask.s_addr) {
110    *lp++ = 8;
111    cp += sizeof(int);
112    *lp = mask.s_addr;
113  } else
114    *lp = 0;
115  cp += sizeof(u_long);
116
117  nb = cp - (char *) &rtmes;
118  rtmes.m_rtm.rtm_msglen = nb;
119  wb = write(s, &rtmes, nb);
120  if (wb < 0) {
121    LogPrintf(LogTCPIP, "OsSetRoute: Dst = %s\n", inet_ntoa(dst));
122    LogPrintf(LogTCPIP, "OsSetRoute:  Gateway = %s\n", inet_ntoa(gateway));
123    LogPrintf(LogTCPIP, "OsSetRoute:  Mask = %s\n", inet_ntoa(mask));
124    switch (rtmes.m_rtm.rtm_errno) {
125    case EEXIST:
126      LogPrintf(LogTCPIP, "Add route failed: Already exists\n");
127      break;
128    case ESRCH:
129      LogPrintf(LogTCPIP, "Del route failed: Non-existent\n");
130      break;
131    case 0:
132      LogPrintf(LogTCPIP, "%s route failed: %s\n", cmdstr, strerror(errno));
133      break;
134    case ENOBUFS:
135    default:
136      LogPrintf(LogTCPIP, "%s route failed: %s\n",
137		cmdstr, strerror(rtmes.m_rtm.rtm_errno));
138      break;
139    }
140  }
141  LogPrintf(LogDEBUG, "wrote %d: cmd = %s, dst = %x, gateway = %x\n",
142            wb, cmdstr, dst.s_addr, gateway.s_addr);
143  close(s);
144}
145
146static void
147p_sockaddr(struct sockaddr *phost, struct sockaddr *pmask, int width)
148{
149  char buf[29];
150  const char *cp;
151  struct sockaddr_in *ihost = (struct sockaddr_in *)phost;
152  struct sockaddr_in *mask = (struct sockaddr_in *)pmask;
153  struct sockaddr_dl *dl = (struct sockaddr_dl *)phost;
154
155  switch (phost->sa_family) {
156  case AF_INET:
157    if (!phost)
158      cp = "";
159    else if (ihost->sin_addr.s_addr == INADDR_ANY)
160      cp = "default";
161    else if (!mask)
162      cp = inet_ntoa(ihost->sin_addr);
163    else {
164      u_int msk = ntohl(mask->sin_addr.s_addr);
165      u_int tst;
166      int bits;
167      int len;
168      struct sockaddr_in net;
169
170      for (tst = 1, bits=32; tst; tst <<= 1, bits--)
171        if (msk & tst)
172          break;
173
174      for (tst <<=1; tst; tst <<= 1)
175        if (!(msk & tst))
176          break;
177
178      net.sin_addr.s_addr = ihost->sin_addr.s_addr & mask->sin_addr.s_addr;
179      sprintf(buf, "%s", inet_ntoa(net.sin_addr));
180      for (len = strlen(buf); len > 3; buf[len-=2] = '\0')
181        if (strcmp(buf+len-2, ".0"))
182          break;
183
184      if (tst)    /* non-contiguous :-( */
185        sprintf(buf+strlen(buf),"&0x%08x", msk);
186      else
187        sprintf(buf+strlen(buf), "/%d", bits);
188      cp = buf;
189    }
190    break;
191
192  case AF_LINK:
193    if (!dl)
194      cp = "";
195    else if (dl->sdl_nlen == 0 && dl->sdl_alen == 0 && dl->sdl_slen == 0) {
196      sprintf(buf, "link#%d", dl->sdl_index);
197      cp = buf;
198    } else if (dl->sdl_type == IFT_ETHER && dl->sdl_alen &&
199               dl->sdl_alen < sizeof(buf)/3) {
200      int f;
201      u_char *MAC;
202
203      MAC = (u_char *)dl->sdl_data + dl->sdl_nlen;
204      for (f = 0; f < dl->sdl_alen; f++)
205        sprintf(buf+f*3, "%02x:", MAC[f]);
206      buf[f*3-1] = '\0';
207      cp = buf;
208    } else
209      cp = "???";
210    break;
211
212  default:
213    cp = "???";
214    break;
215  }
216
217  fprintf(VarTerm, "%-*s ", width-1, cp);
218}
219
220struct bits {
221  u_long b_mask;
222  char b_val;
223} bits[] = {
224
225  { RTF_UP, 'U' },
226  { RTF_GATEWAY, 'G' },
227  { RTF_HOST, 'H' },
228  { RTF_REJECT, 'R' },
229  { RTF_DYNAMIC, 'D' },
230  { RTF_MODIFIED, 'M' },
231  { RTF_DONE, 'd' },
232  { RTF_CLONING, 'C' },
233  { RTF_XRESOLVE, 'X' },
234  { RTF_LLINFO, 'L' },
235  { RTF_STATIC, 'S' },
236  { RTF_PROTO1, '1' },
237  { RTF_PROTO2, '2' },
238  { RTF_BLACKHOLE, 'B' },
239#ifdef __FreeBSD__
240  { RTF_WASCLONED, 'W' },
241  { RTF_PRCLONING, 'c' },
242  { RTF_PROTO3, '3' },
243  { RTF_BROADCAST, 'b' },
244#endif
245  { 0, '\0' }
246};
247
248static void
249p_flags(u_long f, const char *format)
250{
251  if (VarTerm) {
252    char name[33], *flags;
253    register struct bits *p = bits;
254
255    for (flags = name; p->b_mask; p++)
256      if (p->b_mask & f)
257	*flags++ = p->b_val;
258    *flags = '\0';
259    fprintf(VarTerm, format, name);
260  }
261}
262
263static const char *
264Index2Nam(int idx)
265{
266  static char ifs[50][6];
267  static int nifs, debug_done;
268
269  if (!nifs) {
270    int mib[6], needed, len;
271    char *buf, *ptr, *end;
272    struct sockaddr_dl *dl;
273    struct if_msghdr *ifm;
274
275    mib[0] = CTL_NET;
276    mib[1] = PF_ROUTE;
277    mib[2] = 0;
278    mib[3] = 0;
279    mib[4] = NET_RT_IFLIST;
280    mib[5] = 0;
281
282    if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
283      LogPrintf(LogERROR, "Index2Nam: sysctl: estimate: %s\n", strerror(errno));
284      return "???";
285    }
286    if ((buf = malloc(needed)) == NULL)
287      return "???";
288    if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
289      free(buf);
290      return "???";
291    }
292    end = buf + needed;
293
294    for (ptr = buf; ptr < end; ptr += ifm->ifm_msglen) {
295      ifm = (struct if_msghdr *)ptr;
296      dl = (struct sockaddr_dl *)(ifm + 1);
297      if (ifm->ifm_index > 0 && ifm->ifm_index <= sizeof(ifs)/sizeof(ifs[0])
298          && ifs[ifm->ifm_index-1][0] == '\0') {
299        if ((len = dl->sdl_nlen) > sizeof(ifs[0])-1)
300          len = sizeof(ifs[0])-1;
301        strncpy(ifs[ifm->ifm_index-1], dl->sdl_data, len);
302        ifs[ifm->ifm_index-1][len] = '\0';
303        if (len && nifs < ifm->ifm_index)
304          nifs = ifm->ifm_index;
305      } else if (LogIsKept(LogDEBUG))
306        LogPrintf(LogDEBUG, "Skipping out-of-range interface %d!\n",
307                  ifm->ifm_index);
308    }
309    free(buf);
310  }
311
312  if (LogIsKept(LogDEBUG) && !debug_done) {
313    int f;
314
315    LogPrintf(LogDEBUG, "Found the following interfaces:\n");
316    for (f = 0; f < nifs; f++)
317      if (*ifs[f] != '\0')
318        LogPrintf(LogDEBUG, " Index %d, name \"%s\"\n", f+1, ifs[f]);
319    debug_done = 1;
320  }
321
322  if (idx < 1 || idx > nifs || ifs[idx-1][0] == '\0')
323    return "???";
324
325  return ifs[idx-1];
326}
327
328int
329ShowRoute(struct cmdargs const *arg)
330{
331  struct rt_msghdr *rtm;
332  struct sockaddr *sa_dst, *sa_gw, *sa_mask;
333  char *sp, *ep, *cp, *wp;
334  int needed;
335  int mib[6];
336
337  if (!VarTerm)
338    return 1;
339
340  mib[0] = CTL_NET;
341  mib[1] = PF_ROUTE;
342  mib[2] = 0;
343  mib[3] = 0;
344  mib[4] = NET_RT_DUMP;
345  mib[5] = 0;
346  if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
347    LogPrintf(LogERROR, "ShowRoute: sysctl: estimate: %s\n", strerror(errno));
348    return (1);
349  }
350  if (needed < 0)
351    return (1);
352  sp = malloc(needed);
353  if (sp == NULL)
354    return (1);
355  if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
356    LogPrintf(LogERROR, "ShowRoute: sysctl: getroute: %s\n", strerror(errno));
357    free(sp);
358    return (1);
359  }
360  ep = sp + needed;
361
362  fprintf(VarTerm, "%-20s%-20sFlags  Netif\n", "Destination", "Gateway");
363  for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
364    rtm = (struct rt_msghdr *) cp;
365    wp = (char *)(rtm+1);
366
367    if (rtm->rtm_addrs & RTA_DST) {
368      sa_dst = (struct sockaddr *)wp;
369      wp += sa_dst->sa_len;
370    } else
371      sa_dst = NULL;
372
373    if (rtm->rtm_addrs & RTA_GATEWAY) {
374      sa_gw = (struct sockaddr *)wp;
375      wp += sa_gw->sa_len;
376    } else
377      sa_gw = NULL;
378
379    if (rtm->rtm_addrs & RTA_NETMASK) {
380      sa_mask = (struct sockaddr *)wp;
381      wp += sa_mask->sa_len;
382    } else
383      sa_mask = NULL;
384
385    p_sockaddr(sa_dst, sa_mask, 20);
386    p_sockaddr(sa_gw, NULL, 20);
387
388    p_flags(rtm->rtm_flags, "%-6.6s ");
389    fprintf(VarTerm, "%s\n", Index2Nam(rtm->rtm_index));
390  }
391  free(sp);
392  return 0;
393}
394
395/*
396 *  Delete routes associated with our interface
397 */
398void
399DeleteIfRoutes(int all)
400{
401  struct rt_msghdr *rtm;
402  struct sockaddr *sa;
403  struct in_addr sa_dst, sa_gw, sa_mask;
404  int needed;
405  char *sp, *cp, *ep;
406  u_char *wp;
407  int mib[6];
408
409  LogPrintf(LogDEBUG, "DeleteIfRoutes (%d)\n", IfIndex);
410
411  mib[0] = CTL_NET;
412  mib[1] = PF_ROUTE;
413  mib[2] = 0;
414  mib[3] = 0;
415  mib[4] = NET_RT_DUMP;
416  mib[5] = 0;
417  if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
418    LogPrintf(LogERROR, "DeleteIfRoutes: sysctl: estimate: %s\n",
419	      strerror(errno));
420    return;
421  }
422  if (needed < 0)
423    return;
424
425  sp = malloc(needed);
426  if (sp == NULL)
427    return;
428
429  if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
430    LogPrintf(LogERROR, "DeleteIfRoutes: sysctl: getroute: %s\n",
431	      strerror(errno));
432    free(sp);
433    return;
434  }
435  ep = sp + needed;
436
437  for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
438    rtm = (struct rt_msghdr *) cp;
439    sa = (struct sockaddr *) (rtm + 1);
440    LogPrintf(LogDEBUG, "DeleteIfRoutes: addrs: %x, Netif: %d (%s), flags: %x,"
441	      " dst: %s ?\n", rtm->rtm_addrs, rtm->rtm_index,
442              Index2Nam(rtm->rtm_index), rtm->rtm_flags,
443	      inet_ntoa(((struct sockaddr_in *) sa)->sin_addr));
444    if (rtm->rtm_addrs & RTA_DST && rtm->rtm_addrs & RTA_GATEWAY &&
445	rtm->rtm_index == IfIndex &&
446	(all || (rtm->rtm_flags & RTF_GATEWAY))) {
447      sa_dst.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
448      wp = (u_char *) cp + rtm->rtm_msglen;
449      sa = (struct sockaddr *)((char *)sa + sa->sa_len);
450      if (sa->sa_family == AF_INET) {
451        LogPrintf(LogDEBUG, "DeleteIfRoutes: Remove it\n");
452        sa_gw.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
453        sa = (struct sockaddr *)((char *)sa + sa->sa_len);
454        if (rtm->rtm_addrs & RTA_NETMASK)
455          sa_mask.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
456        else
457          sa_mask.s_addr = 0xffffffff;
458        if (sa_dst.s_addr == INADDR_ANY)
459	  sa_mask.s_addr = INADDR_ANY;
460        LogPrintf(LogDEBUG, "DeleteIfRoutes: Dst: %s\n", inet_ntoa(sa_dst));
461        LogPrintf(LogDEBUG, "DeleteIfRoutes: Gw: %s\n", inet_ntoa(sa_gw));
462        LogPrintf(LogDEBUG, "DeleteIfRoutes: Index: %d\n", rtm->rtm_index);
463        OsSetRoute(RTM_DELETE, sa_dst, sa_gw, sa_mask);
464      } else
465        LogPrintf(LogDEBUG, "DeleteIfRoutes: Can't remove an AF_LINK !\n");
466    }
467  }
468  free(sp);
469}
470
471int
472GetIfIndex(char *name)
473{
474  int idx;
475  const char *got;
476
477  idx = 1;
478  while (strcmp(got = Index2Nam(idx), "???"))
479    if (!strcmp(got, name))
480      return IfIndex = idx;
481    else
482      idx++;
483  return -1;
484}
485