xref: /freebsd/usr.sbin/ppp/iface.c (revision 71fe318b852b8dfb3e799cb12ef184750f7f8eac)
1 /*-
2  * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * $FreeBSD$
27  */
28 
29 #include <sys/param.h>
30 #include <sys/socket.h>
31 #include <netinet/in.h>
32 #include <net/if.h>
33 #include <net/if_dl.h>
34 #ifdef __FreeBSD__
35 #include <net/if_var.h>
36 #endif
37 #include <net/route.h>
38 #include <netinet/in_systm.h>
39 #include <netinet/in_var.h>
40 #include <netinet/ip.h>
41 #ifndef NOINET6
42 #include <netinet6/nd6.h>
43 #endif
44 #include <sys/un.h>
45 
46 #include <errno.h>
47 #include <string.h>
48 #include <stdarg.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <sys/ioctl.h>
52 #include <sys/sysctl.h>
53 #include <termios.h>
54 #include <unistd.h>
55 
56 #include "layer.h"
57 #include "defs.h"
58 #include "command.h"
59 #include "mbuf.h"
60 #include "log.h"
61 #include "id.h"
62 #include "timer.h"
63 #include "fsm.h"
64 #include "iplist.h"
65 #include "lqr.h"
66 #include "hdlc.h"
67 #include "throughput.h"
68 #include "slcompress.h"
69 #include "descriptor.h"
70 #include "ncpaddr.h"
71 #include "ipcp.h"
72 #include "filter.h"
73 #include "lcp.h"
74 #include "ccp.h"
75 #include "link.h"
76 #include "mp.h"
77 #ifndef NORADIUS
78 #include "radius.h"
79 #endif
80 #include "ipv6cp.h"
81 #include "ncp.h"
82 #include "bundle.h"
83 #include "prompt.h"
84 #include "iface.h"
85 
86 
87 struct iface *
88 iface_Create(const char *name)
89 {
90   int mib[6], maxtries, err;
91   size_t needed, namelen;
92   char *buf, *ptr, *end;
93   struct if_msghdr *ifm;
94   struct ifa_msghdr *ifam;
95   struct sockaddr_dl *dl;
96   struct sockaddr *sa[RTAX_MAX];
97   struct iface *iface;
98   struct iface_addr *addr;
99 
100   mib[0] = CTL_NET;
101   mib[1] = PF_ROUTE;
102   mib[2] = 0;
103   mib[3] = 0;
104   mib[4] = NET_RT_IFLIST;
105   mib[5] = 0;
106 
107   maxtries = 20;
108   err = 0;
109   do {
110     if (maxtries-- == 0 || (err && err != ENOMEM)) {
111       fprintf(stderr, "iface_Create: sysctl: %s\n", strerror(err));
112       return NULL;
113     }
114 
115     if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
116       fprintf(stderr, "iface_Create: sysctl: estimate: %s\n",
117                 strerror(errno));
118       return NULL;
119     }
120 
121     if ((buf = (char *)malloc(needed)) == NULL) {
122       fprintf(stderr, "iface_Create: malloc failed: %s\n", strerror(errno));
123       return NULL;
124     }
125 
126     if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
127       err = errno;
128       free(buf);
129       buf = NULL;
130     }
131   } while (buf == NULL);
132 
133   ptr = buf;
134   end = buf + needed;
135   iface = NULL;
136   namelen = strlen(name);
137 
138   while (ptr < end && iface == NULL) {
139     ifm = (struct if_msghdr *)ptr;			/* On if_msghdr */
140     if (ifm->ifm_type != RTM_IFINFO)
141       break;
142     dl = (struct sockaddr_dl *)(ifm + 1);		/* Single _dl at end */
143     if (dl->sdl_nlen == namelen && !strncmp(name, dl->sdl_data, namelen)) {
144       iface = (struct iface *)malloc(sizeof *iface);
145       if (iface == NULL) {
146         fprintf(stderr, "iface_Create: malloc: %s\n", strerror(errno));
147         return NULL;
148       }
149       iface->name = strdup(name);
150       iface->index = ifm->ifm_index;
151       iface->flags = ifm->ifm_flags;
152       iface->mtu = 0;
153       iface->addrs = 0;
154       iface->addr = NULL;
155     }
156     ptr += ifm->ifm_msglen;				/* First ifa_msghdr */
157     for (; ptr < end; ptr += ifam->ifam_msglen) {
158       ifam = (struct ifa_msghdr *)ptr;			/* Next if address */
159 
160       if (ifam->ifam_type != RTM_NEWADDR)		/* finished this if */
161         break;
162 
163       if (iface != NULL && ifam->ifam_addrs & RTA_IFA) {
164         /* Found a configured interface ! */
165         iface_ParseHdr(ifam, sa);
166 
167         if (sa[RTAX_IFA] && (sa[RTAX_IFA]->sa_family == AF_INET
168 #ifndef NOINET6
169                              || sa[RTAX_IFA]->sa_family == AF_INET6
170 #endif
171                              )) {
172           /* Record the address */
173 
174           addr = (struct iface_addr *)
175             realloc(iface->addr, (iface->addrs + 1) * sizeof iface->addr[0]);
176           if (addr == NULL)
177             break;
178           iface->addr = addr;
179 
180           addr += iface->addrs;
181           iface->addrs++;
182 
183           ncprange_setsa(&addr->ifa, sa[RTAX_IFA], sa[RTAX_NETMASK]);
184           if (sa[RTAX_BRD])
185             ncpaddr_setsa(&addr->peer, sa[RTAX_BRD]);
186           else
187             ncpaddr_init(&addr->peer);
188         }
189       }
190     }
191   }
192 
193   free(buf);
194 
195   return iface;
196 }
197 
198 static int
199 iface_addr_Zap(const char *name, struct iface_addr *addr, int s)
200 {
201   struct ifaliasreq ifra;
202 #ifndef NOINET6
203   struct in6_aliasreq ifra6;
204 #endif
205   struct sockaddr_in *me4, *msk4, *peer4;
206   struct sockaddr_storage ssme, sspeer, ssmsk;
207   int res;
208 
209   ncprange_getsa(&addr->ifa, &ssme, &ssmsk);
210   ncpaddr_getsa(&addr->peer, &sspeer);
211   res = 0;
212 
213   switch (ncprange_family(&addr->ifa)) {
214   case AF_INET:
215     memset(&ifra, '\0', sizeof ifra);
216     strncpy(ifra.ifra_name, name, sizeof ifra.ifra_name - 1);
217 
218     me4 = (struct sockaddr_in *)&ifra.ifra_addr;
219     memcpy(me4, &ssme, sizeof *me4);
220 
221     msk4 = (struct sockaddr_in *)&ifra.ifra_mask;
222     memcpy(msk4, &ssmsk, sizeof *msk4);
223 
224     peer4 = (struct sockaddr_in *)&ifra.ifra_broadaddr;
225     if (ncpaddr_family(&addr->peer) == AF_UNSPEC) {
226       peer4->sin_family = AF_INET;
227       peer4->sin_len = sizeof(*peer4);
228       peer4->sin_addr.s_addr = INADDR_NONE;
229     } else
230       memcpy(peer4, &sspeer, sizeof *peer4);
231 
232     res = ID0ioctl(s, SIOCDIFADDR, &ifra);
233     if (log_IsKept(LogDEBUG)) {
234       char buf[100];
235 
236       snprintf(buf, sizeof buf, "%s", ncprange_ntoa(&addr->ifa));
237       log_Printf(LogWARN, "%s: DIFADDR %s -> %s returns %d\n",
238                  ifra.ifra_name, buf, ncpaddr_ntoa(&addr->peer), res);
239     }
240     break;
241 
242 #ifndef NOINET6
243   case AF_INET6:
244     memset(&ifra6, '\0', sizeof ifra6);
245     strncpy(ifra6.ifra_name, name, sizeof ifra6.ifra_name - 1);
246 
247     memcpy(&ifra6.ifra_addr, &ssme, sizeof ifra6.ifra_addr);
248     memcpy(&ifra6.ifra_prefixmask, &ssmsk, sizeof ifra6.ifra_prefixmask);
249     ifra6.ifra_prefixmask.sin6_family = AF_UNSPEC;
250     if (ncpaddr_family(&addr->peer) == AF_UNSPEC)
251       ifra6.ifra_dstaddr.sin6_family = AF_UNSPEC;
252     else
253       memcpy(&ifra6.ifra_dstaddr, &sspeer, sizeof ifra6.ifra_dstaddr);
254     ifra6.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
255     ifra6.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
256 
257     res = ID0ioctl(s, SIOCDIFADDR_IN6, &ifra6);
258     break;
259 #endif
260   }
261 
262   if (res == -1) {
263     char dst[40];
264     const char *end =
265 #ifndef NOINET6
266       ncprange_family(&addr->ifa) == AF_INET6 ? "_IN6" :
267 #endif
268       "";
269 
270     if (ncpaddr_family(&addr->peer) == AF_UNSPEC)
271       log_Printf(LogWARN, "iface rm: ioctl(SIOCDIFADDR%s, %s): %s\n",
272                  end, ncprange_ntoa(&addr->ifa), strerror(errno));
273     else {
274       snprintf(dst, sizeof dst, "%s", ncpaddr_ntoa(&addr->peer));
275       log_Printf(LogWARN, "iface rm: ioctl(SIOCDIFADDR%s, %s -> %s): %s\n",
276                  end, ncprange_ntoa(&addr->ifa), dst, strerror(errno));
277     }
278   }
279 
280   return res != -1;
281 }
282 
283 static int
284 iface_addr_Add(const char *name, struct iface_addr *addr, int s)
285 {
286   struct ifaliasreq ifra;
287 #ifndef NOINET6
288   struct in6_aliasreq ifra6;
289 #endif
290   struct sockaddr_in *me4, *msk4, *peer4;
291   struct sockaddr_storage ssme, sspeer, ssmsk;
292   int res;
293 
294   ncprange_getsa(&addr->ifa, &ssme, &ssmsk);
295   ncpaddr_getsa(&addr->peer, &sspeer);
296   res = 0;
297 
298   switch (ncprange_family(&addr->ifa)) {
299   case AF_INET:
300     memset(&ifra, '\0', sizeof ifra);
301     strncpy(ifra.ifra_name, name, sizeof ifra.ifra_name - 1);
302 
303     me4 = (struct sockaddr_in *)&ifra.ifra_addr;
304     memcpy(me4, &ssme, sizeof *me4);
305 
306     msk4 = (struct sockaddr_in *)&ifra.ifra_mask;
307     memcpy(msk4, &ssmsk, sizeof *msk4);
308 
309     peer4 = (struct sockaddr_in *)&ifra.ifra_broadaddr;
310     if (ncpaddr_family(&addr->peer) == AF_UNSPEC) {
311       peer4->sin_family = AF_INET;
312       peer4->sin_len = sizeof(*peer4);
313       peer4->sin_addr.s_addr = INADDR_NONE;
314     } else
315       memcpy(peer4, &sspeer, sizeof *peer4);
316 
317     res = ID0ioctl(s, SIOCAIFADDR, &ifra);
318     if (log_IsKept(LogDEBUG)) {
319       char buf[100];
320 
321       snprintf(buf, sizeof buf, "%s", ncprange_ntoa(&addr->ifa));
322       log_Printf(LogWARN, "%s: AIFADDR %s -> %s returns %d\n",
323                  ifra.ifra_name, buf, ncpaddr_ntoa(&addr->peer), res);
324     }
325     break;
326 
327 #ifndef NOINET6
328   case AF_INET6:
329     memset(&ifra6, '\0', sizeof ifra6);
330     strncpy(ifra6.ifra_name, name, sizeof ifra6.ifra_name - 1);
331 
332     memcpy(&ifra6.ifra_addr, &ssme, sizeof ifra6.ifra_addr);
333     memcpy(&ifra6.ifra_prefixmask, &ssmsk, sizeof ifra6.ifra_prefixmask);
334     if (ncpaddr_family(&addr->peer) == AF_UNSPEC)
335       ifra6.ifra_dstaddr.sin6_family = AF_UNSPEC;
336     else
337       memcpy(&ifra6.ifra_dstaddr, &sspeer, sizeof ifra6.ifra_dstaddr);
338     ifra6.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
339     ifra6.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
340 
341     res = ID0ioctl(s, SIOCAIFADDR_IN6, &ifra6);
342     break;
343 #endif
344   }
345 
346   if (res == -1) {
347     char dst[40];
348     const char *end =
349 #ifndef NOINET6
350       ncprange_family(&addr->ifa) == AF_INET6 ? "_IN6" :
351 #endif
352       "";
353 
354     if (ncpaddr_family(&addr->peer) == AF_UNSPEC)
355       log_Printf(LogWARN, "iface add: ioctl(SIOCAIFADDR%s, %s): %s\n",
356                  end, ncprange_ntoa(&addr->ifa), strerror(errno));
357     else {
358       snprintf(dst, sizeof dst, "%s", ncpaddr_ntoa(&addr->peer));
359       log_Printf(LogWARN, "iface add: ioctl(SIOCAIFADDR%s, %s -> %s): %s\n",
360                  end, ncprange_ntoa(&addr->ifa), dst, strerror(errno));
361     }
362   }
363 
364   return res != -1;
365 }
366 
367 
368 void
369 iface_Clear(struct iface *iface, struct ncp *ncp, int family, int how)
370 {
371   int addrs, af, inskip, in6skip, n, s4 = -1, s6 = -1, *s;
372 
373   if (iface->addrs) {
374     inskip = in6skip = how == IFACE_CLEAR_ALL ? 0 : 1;
375     addrs = 0;
376 
377     for (n = 0; n < iface->addrs; n++) {
378       af = ncprange_family(&iface->addr[n].ifa);
379       if (family == 0 || family == af) {
380         if (!iface->addr[n].system && (how & IFACE_SYSTEM))
381           continue;
382         switch (af) {
383         case AF_INET:
384           if (inskip) {
385             inskip = 0;
386             continue;
387           }
388           s = &s4;
389           break;
390 
391 #ifndef NOINET6
392         case AF_INET6:
393           if (in6skip) {
394             in6skip = 0;
395             continue;
396           }
397           s = &s6;
398           break;
399 #endif
400         default:
401           continue;
402         }
403 
404         if (*s == -1 && (*s = ID0socket(af, SOCK_DGRAM, 0)) == -1)
405           log_Printf(LogERROR, "iface_Clear: socket(): %s\n", strerror(errno));
406         else if (iface_addr_Zap(iface->name, iface->addr + n, *s)) {
407           ncp_IfaceAddrDeleted(ncp, iface->addr + n);
408           bcopy(iface->addr + n + 1, iface->addr + n,
409                 (iface->addrs - n - 1) * sizeof *iface->addr);
410           iface->addrs--;
411           n--;
412         }
413       }
414     }
415 
416     /* Don't bother realloc()ing - we have little to gain */
417 
418     if (s4)
419       close(s4);
420     if (s6)
421       close(s6);
422   }
423 }
424 
425 int
426 iface_Add(struct iface *iface, struct ncp *ncp, const struct ncprange *ifa,
427           const struct ncpaddr *peer, int how)
428 {
429   int af, n, removed, s, width;
430   struct ncpaddr ncplocal;
431   struct iface_addr *addr, newaddr;
432 
433   af = ncprange_family(ifa);
434   if ((s = ID0socket(af, SOCK_DGRAM, 0)) == -1) {
435     log_Printf(LogERROR, "iface_Add: socket(): %s\n", strerror(errno));
436     return 0;
437   }
438   ncprange_getaddr(ifa, &ncplocal);
439 
440   for (n = 0; n < iface->addrs; n++) {
441     if (ncprange_contains(&iface->addr[n].ifa, &ncplocal) ||
442         ncpaddr_equal(&iface->addr[n].peer, peer)) {
443       /* Replace this sockaddr */
444       if (!(how & IFACE_FORCE_ADD)) {
445         close(s);
446         return 0;	/* errno = EEXIST; */
447       }
448 
449       if (ncprange_equal(&iface->addr[n].ifa, ifa) &&
450           ncpaddr_equal(&iface->addr[n].peer, peer)) {
451         close(s);
452         return 1;	/* Already there */
453       }
454 
455       width =
456 #ifndef NOINET6
457         (af == AF_INET6) ? 128 :
458 #endif
459       32;
460       removed = iface_addr_Zap(iface->name, iface->addr + n, s);
461       if (removed)
462         ncp_IfaceAddrDeleted(ncp, iface->addr + n);
463       ncprange_copy(&iface->addr[n].ifa, ifa);
464       ncpaddr_copy(&iface->addr[n].peer, peer);
465       if (!iface_addr_Add(iface->name, iface->addr + n, s)) {
466         if (removed) {
467           bcopy(iface->addr + n + 1, iface->addr + n,
468                 (iface->addrs - n - 1) * sizeof *iface->addr);
469           iface->addrs--;
470           n--;
471         }
472         close(s);
473         return 0;
474       }
475       close(s);
476       ncp_IfaceAddrAdded(ncp, iface->addr + n);
477       return 1;
478     }
479   }
480 
481   addr = (struct iface_addr *)realloc
482     (iface->addr, (iface->addrs + 1) * sizeof iface->addr[0]);
483   if (addr == NULL) {
484     log_Printf(LogERROR, "iface_inAdd: realloc: %s\n", strerror(errno));
485     close(s);
486     return 0;
487   }
488   iface->addr = addr;
489 
490   ncprange_copy(&newaddr.ifa, ifa);
491   ncpaddr_copy(&newaddr.peer, peer);
492   newaddr.system = !!(how & IFACE_SYSTEM);
493   if (!iface_addr_Add(iface->name, &newaddr, s)) {
494     close(s);
495     return 0;
496   }
497 
498   if (how & IFACE_ADD_FIRST) {
499     /* Stuff it at the start of our list */
500     n = 0;
501     bcopy(iface->addr, iface->addr + 1, iface->addrs * sizeof *iface->addr);
502   } else
503     n = iface->addrs;
504 
505   iface->addrs++;
506   memcpy(iface->addr + n, &newaddr, sizeof(*iface->addr));
507 
508   close(s);
509   ncp_IfaceAddrAdded(ncp, iface->addr + n);
510 
511   return 1;
512 }
513 
514 int
515 iface_Delete(struct iface *iface, struct ncp *ncp, const struct ncpaddr *del)
516 {
517   struct ncpaddr found;
518   int n, res, s;
519 
520   if ((s = ID0socket(ncpaddr_family(del), SOCK_DGRAM, 0)) == -1) {
521     log_Printf(LogERROR, "iface_Delete: socket(): %s\n", strerror(errno));
522     return 0;
523   }
524 
525   for (n = res = 0; n < iface->addrs; n++) {
526     ncprange_getaddr(&iface->addr[n].ifa, &found);
527     if (ncpaddr_equal(&found, del)) {
528       if (iface_addr_Zap(iface->name, iface->addr + n, s)) {
529         ncp_IfaceAddrDeleted(ncp, iface->addr + n);
530         bcopy(iface->addr + n + 1, iface->addr + n,
531               (iface->addrs - n - 1) * sizeof *iface->addr);
532         iface->addrs--;
533         res = 1;
534       }
535       break;
536     }
537   }
538 
539   close(s);
540 
541   return res;
542 }
543 
544 #define IFACE_ADDFLAGS 1
545 #define IFACE_DELFLAGS 2
546 
547 static int
548 iface_ChangeFlags(const char *ifname, int flags, int how)
549 {
550   struct ifreq ifrq;
551   int s, new_flags;
552 
553   s = ID0socket(PF_INET, SOCK_DGRAM, 0);
554   if (s < 0) {
555     log_Printf(LogERROR, "iface_ChangeFlags: socket: %s\n", strerror(errno));
556     return 0;
557   }
558 
559   memset(&ifrq, '\0', sizeof ifrq);
560   strncpy(ifrq.ifr_name, ifname, sizeof ifrq.ifr_name - 1);
561   ifrq.ifr_name[sizeof ifrq.ifr_name - 1] = '\0';
562   if (ID0ioctl(s, SIOCGIFFLAGS, &ifrq) < 0) {
563     log_Printf(LogERROR, "iface_ChangeFlags: ioctl(SIOCGIFFLAGS): %s\n",
564        strerror(errno));
565     close(s);
566     return 0;
567   }
568   new_flags = (ifrq.ifr_flags & 0xffff) | (ifrq.ifr_flagshigh << 16);
569 
570   if (how == IFACE_ADDFLAGS)
571     new_flags |= flags;
572   else
573     new_flags &= ~flags;
574   ifrq.ifr_flags = new_flags & 0xffff;
575   ifrq.ifr_flagshigh = new_flags >> 16;
576 
577   if (ID0ioctl(s, SIOCSIFFLAGS, &ifrq) < 0) {
578     log_Printf(LogERROR, "iface_ChangeFlags: ioctl(SIOCSIFFLAGS): %s\n",
579        strerror(errno));
580     close(s);
581     return 0;
582   }
583   close(s);
584 
585   return 1;	/* Success */
586 }
587 
588 int
589 iface_SetFlags(const char *ifname, int flags)
590 {
591   return iface_ChangeFlags(ifname, flags, IFACE_ADDFLAGS);
592 }
593 
594 int
595 iface_ClearFlags(const char *ifname, int flags)
596 {
597   return iface_ChangeFlags(ifname, flags, IFACE_DELFLAGS);
598 }
599 
600 void
601 iface_Destroy(struct iface *iface)
602 {
603   /*
604    * iface_Clear(iface, IFACE_CLEAR_ALL) must be called manually
605    * if that's what the user wants.  It's better to leave the interface
606    * allocated so that existing connections can continue to work.
607    */
608 
609   if (iface != NULL) {
610     free(iface->name);
611     free(iface->addr);
612     free(iface);
613   }
614 }
615 
616 #define if_entry(x) { IFF_##x, #x }
617 
618 struct {
619   int flag;
620   const char *value;
621 } if_flags[] = {
622   if_entry(UP),
623   if_entry(BROADCAST),
624   if_entry(DEBUG),
625   if_entry(LOOPBACK),
626   if_entry(POINTOPOINT),
627   if_entry(RUNNING),
628   if_entry(NOARP),
629   if_entry(PROMISC),
630   if_entry(ALLMULTI),
631   if_entry(OACTIVE),
632   if_entry(SIMPLEX),
633   if_entry(LINK0),
634   if_entry(LINK1),
635   if_entry(LINK2),
636   if_entry(MULTICAST),
637   { 0, "???" }
638 };
639 
640 int
641 iface_Show(struct cmdargs const *arg)
642 {
643   struct ncpaddr ncpaddr;
644   struct iface *iface = arg->bundle->iface, *current;
645   int f, flags;
646 #ifndef NOINET6
647   int scopeid, width;
648 #endif
649   struct in_addr mask;
650 
651   current = iface_Create(iface->name);
652   flags = iface->flags = current->flags;
653   iface_Destroy(current);
654 
655   prompt_Printf(arg->prompt, "%s (idx %d) <", iface->name, iface->index);
656   for (f = 0; f < sizeof if_flags / sizeof if_flags[0]; f++)
657     if ((if_flags[f].flag & flags)) {
658       prompt_Printf(arg->prompt, "%s%s", flags == iface->flags ? "" : ",",
659                     if_flags[f].value);
660       flags &= ~if_flags[f].flag;
661     }
662 
663 #if 0
664   if (flags)
665     prompt_Printf(arg->prompt, "%s0x%x", flags == iface->flags ? "" : ",",
666                   flags);
667 #endif
668 
669   prompt_Printf(arg->prompt, "> mtu %d has %d address%s:\n", iface->mtu,
670                 iface->addrs, iface->addrs == 1 ? "" : "es");
671 
672   for (f = 0; f < iface->addrs; f++) {
673     ncprange_getaddr(&iface->addr[f].ifa, &ncpaddr);
674     switch (ncprange_family(&iface->addr[f].ifa)) {
675     case AF_INET:
676       prompt_Printf(arg->prompt, "  inet %s --> ", ncpaddr_ntoa(&ncpaddr));
677       if (ncpaddr_family(&iface->addr[f].peer) == AF_UNSPEC)
678         prompt_Printf(arg->prompt, "255.255.255.255");
679       else
680         prompt_Printf(arg->prompt, "%s", ncpaddr_ntoa(&iface->addr[f].peer));
681       ncprange_getip4mask(&iface->addr[f].ifa, &mask);
682       prompt_Printf(arg->prompt, " netmask 0x%08lx", (long)ntohl(mask.s_addr));
683       break;
684 
685 #ifndef NOINET6
686     case AF_INET6:
687       prompt_Printf(arg->prompt, "  inet6 %s", ncpaddr_ntoa(&ncpaddr));
688       if (ncpaddr_family(&iface->addr[f].peer) != AF_UNSPEC)
689         prompt_Printf(arg->prompt, " --> %s",
690                       ncpaddr_ntoa(&iface->addr[f].peer));
691       ncprange_getwidth(&iface->addr[f].ifa, &width);
692       if (ncpaddr_family(&iface->addr[f].peer) == AF_UNSPEC)
693         prompt_Printf(arg->prompt, " prefixlen %d", width);
694       if ((scopeid = ncprange_scopeid(&iface->addr[f].ifa)) != -1)
695         prompt_Printf(arg->prompt, " scopeid 0x%x", (unsigned)scopeid);
696       break;
697 #endif
698     }
699     prompt_Printf(arg->prompt, "\n");
700   }
701 
702   return 0;
703 }
704 
705 void
706 iface_ParseHdr(struct ifa_msghdr *ifam, struct sockaddr *sa[RTAX_MAX])
707 {
708   char *wp;
709   int rtax;
710 
711   wp = (char *)(ifam + 1);
712 
713   for (rtax = 0; rtax < RTAX_MAX; rtax++)
714     if (ifam->ifam_addrs & (1 << rtax)) {
715       sa[rtax] = (struct sockaddr *)wp;
716       wp += ROUNDUP(sa[rtax]->sa_len);
717     } else
718       sa[rtax] = NULL;
719 }
720