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remove debug output on initial interface enumeration
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1 /***
2   This file is part of catta.
3
4   catta is free software; you can redistribute it and/or modify it
5   under the terms of the GNU Lesser General Public License as
6   published by the Free Software Foundation; either version 2.1 of the
7   License, or (at your option) any later version.
8
9   catta is distributed in the hope that it will be useful, but WITHOUT
10   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11   or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
12   Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with catta; if not, write to the Free Software
16   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
17   USA.
18 ***/
19
20 #include "iface.h"
21 #include "iface-windows.h"
22
23 #include <stdlib.h> // wcstombs
24 #include <catta/malloc.h>
25 #include <catta/log.h>
26 #include <iphlpapi.h>
27 #include <assert.h>
28 #include "hashmap.h"
29 #include "util.h"   // catta_format_mac_address
30 #include "fdutil.h" // catta_set_nonblock
31
32
33 typedef enum {
34     INTERFACE_CHANGE_EVENT,
35     ADDRESS_CHANGE_EVENT
36 } ChangeEventType;
37
38 struct ChangeEvent {
39     CATTA_LLIST_FIELDS(ChangeEvent, event);
40     ChangeEventType type;
41     MIB_NOTIFICATION_TYPE notification_type;
42     union {
43         MIB_IPINTERFACE_ROW iface;
44         MIB_UNICASTIPADDRESS_ROW addr;
45     } data;
46 };
47
48
49 // helper: determine the global_scope flag for an address
50 static void set_global_scope_flag(CattaInterfaceAddress *ifaddr, const CattaAddress *addr)
51 {
52     if(addr->proto == CATTA_PROTO_INET6) {
53         const struct in6_addr *ia = (struct in6_addr *)addr->data.ipv6.address;
54         ifaddr->global_scope = !(IN6_IS_ADDR_LINKLOCAL(ia) || IN6_IS_ADDR_MULTICAST(ia));
55     } else {
56         ifaddr->global_scope = 1;
57     }
58 }
59
60 // integrate the information from an IP_ADAPTER_UNICAST_ADDRESS structure for
61 // given CattaHwInterface into the CattaInterfaceMonitor
62 static void ip_adapter_unicast_address(CattaInterfaceMonitor *m,
63                                        CattaHwInterface *hw,
64                                        IP_ADAPTER_UNICAST_ADDRESS *a)
65 {
66     CattaInterface *iface;
67     CattaAddress addr;
68     CattaInterfaceAddress *ifaddr;
69     struct sockaddr *sa = a->Address.lpSockaddr;
70
71     // skip transient addresses; to quote MSDN: "The IP address is a cluster
72     // address and should not be used by most applications."
73     // http://msdn.microsoft.com/en-us/library/windows/desktop/aa366066(v=vs.85).aspx
74     if(a->Flags & IP_ADAPTER_ADDRESS_TRANSIENT)
75         return;
76
77     // fill addr struct for address lookup
78     switch(sa->sa_family) {
79     case AF_INET:
80         memcpy(addr.data.data, &((struct sockaddr_in *)sa)->sin_addr, sizeof(struct in_addr));
81         break;
82     case AF_INET6:
83         memcpy(addr.data.data, &((struct sockaddr_in6 *)sa)->sin6_addr, sizeof(struct in6_addr));
84         break;
85     default:
86         catta_log_debug("unexpected address family on interface %d: %u", hw->index, sa->sa_family);
87         return;
88     }
89     addr.proto = catta_af_to_proto(sa->sa_family);
90
91     // get protocol-specific CattaInterface object
92     if(!(iface = catta_interface_monitor_get_interface(m, hw->index, addr.proto))) {
93         catta_log_error("CattaInterface (index %d, proto %d) not found", hw->index, addr.proto);
94         return;
95     }
96
97     // find or allocate a CattaInterfaceAddress struct for this address
98     if(!(ifaddr = catta_interface_monitor_get_address(m, iface, &addr))) {
99         if(!(ifaddr = catta_interface_address_new(m, iface, &addr, a->OnLinkPrefixLength))) {
100             catta_log_error("out of memory in ip_adapter_unicast_address");
101             return;
102         }
103     }
104
105     set_global_scope_flag(ifaddr, &addr);
106 }
107
108 // integrate the information from an IP_ADAPTER_ADDRESSES structure
109 // as returned by GetAdaptersAddresses into the CattaInterfaceMonitor
110 static void ip_adapter(CattaInterfaceMonitor *m, IP_ADAPTER_ADDRESSES *p)
111 {
112     IP_ADAPTER_UNICAST_ADDRESS *a;
113     CattaIfIndex idx;
114     CattaHwInterface *hw;
115     size_t n;
116
117     // we want an index specific to the hardware interface, but Windows
118     // has one for IPv4 and one for IPv6. it seems like these are always the
119     // same unless one of the protocols is not available. let's have a bunch of
120     // checks...
121     if(!p->IfIndex && !p->Ipv6IfIndex) {
122         return; // no usable protocols
123     } else if(!p->IfIndex) {
124         idx = p->Ipv6IfIndex;   // IPv6 but no IPv4 (huh!)
125     } else if(!p->Ipv6IfIndex) {
126         idx = p->IfIndex;       // IPv4 but no IPv6
127     } else if(p->IfIndex == p->Ipv6IfIndex) {
128         idx = p->IfIndex;       // same index for both protocols
129     } else {
130         // both indexes valid but not equal
131         catta_log_error("unsupported interface: %ls (IfIndex and Ipv6IfIndex differ: %u/%u)",
132             p->FriendlyName, (unsigned int)p->IfIndex, (unsigned int)p->Ipv6IfIndex);
133         return;
134     }
135
136     // find the CattaHwInterface by index or allocate a new one
137     if((hw = catta_interface_monitor_get_hw_interface(m, idx)) == NULL) {
138         if((hw = catta_hw_interface_new(m, idx)) == NULL) {
139             catta_log_error("catta_hw_interface_new failed in ip_adapter_address");
140             return;
141         }
142     }
143
144     // fill the CattaHwInterface struct with data
145     // notice: this code is essentially duplicated in update_hw_interface()
146     hw->flags_ok =
147         (p->OperStatus == IfOperStatusUp) &&
148         !(p->IfType == IF_TYPE_SOFTWARE_LOOPBACK) &&
149         !(p->Flags & IP_ADAPTER_NO_MULTICAST) &&
150         (m->server->config.allow_point_to_point || !(p->IfType == IF_TYPE_PPP));
151             // XXX what about IF_TYPE_TUNNEL?
152
153     n = wcstombs(NULL, p->FriendlyName, 0) + 1;
154     catta_free(hw->name);
155     hw->name = catta_new(char, n);
156     wcstombs(hw->name, p->FriendlyName, n);
157
158     hw->mtu = p->Mtu;
159
160     hw->mac_address_size = p->PhysicalAddressLength;
161     if(hw->mac_address_size > CATTA_MAC_ADDRESS_MAX)
162         hw->mac_address_size = CATTA_MAC_ADDRESS_MAX;
163     memcpy(hw->mac_address, p->PhysicalAddress, hw->mac_address_size);
164
165     // process addresses
166     // XXX remove addresses that are no longer in the list
167     for(a=p->FirstUnicastAddress; a; a=a->Next)
168         ip_adapter_unicast_address(m, hw, a);
169 }
170
171
172 // place the event into the queue to be handled (by the main thread)
173 // and wake the event handler if necessary
174 static void queue_event(CattaInterfaceMonitor *m, ChangeEvent *ev)
175 {
176     char c = 'X';
177
178     if(!ev)
179         return;
180
181     if(!pthread_mutex_lock(&m->osdep.mutex)) {
182         // queue the event
183         CATTA_LLIST_APPEND(ChangeEvent, event, m->osdep.events, ev);
184
185         // wake the handler
186         writepipe(m->osdep.pipefd[1], &c, sizeof(c));
187
188         pthread_mutex_unlock(&m->osdep.mutex);
189     } else {
190         catta_log_debug(__FILE__": queue_event: could not lock mutex");
191         catta_free(ev);
192     }
193 }
194
195 // copy the given data row into an appropriate change event struct
196 static ChangeEvent *new_event(ChangeEventType type, MIB_NOTIFICATION_TYPE ntype, void *row, size_t n)
197 {
198     ChangeEvent *ev;
199
200     if(!row)
201         return NULL;
202
203     if(!(ev = catta_new(ChangeEvent, 1)))
204         return NULL;
205
206     ev->type = type;
207     ev->notification_type = ntype;
208     memcpy(&ev->data, row, n);
209
210     return ev;
211 }
212
213 static void WINAPI icn_callback(void *m, MIB_IPINTERFACE_ROW *row, MIB_NOTIFICATION_TYPE type)
214 {
215     queue_event(m, new_event(INTERFACE_CHANGE_EVENT, type, row, sizeof(*row)));
216 }
217
218 static void WINAPI acn_callback(void *m, MIB_UNICASTIPADDRESS_ROW *row, MIB_NOTIFICATION_TYPE type)
219 {
220     queue_event(m, new_event(ADDRESS_CHANGE_EVENT, type, row, sizeof(*row)));
221 }
222
223 static void update_hw_interface(CattaHwInterface *hw)
224 {
225     MIB_IF_ROW2 row;
226     DWORD r;
227     size_t n;
228     int multicast;  // synthetic flag
229
230     row.InterfaceLuid.Value = 0;
231     row.InterfaceIndex = hw->index;
232     if((r = GetIfEntry2(&row)) != NO_ERROR) {
233         catta_log_error("GetIfEntry2 failed for iface %d (error %u)", hw->index, (unsigned int)r);
234         return;
235     }
236
237     // fill the CattaHwInterface struct with data
238     // notice: this code is essentially duplicated from ip_adapter()
239     // notice: not sure where to find the IP_ADAPTER_NO_MULTICAST flag from an
240     //         MIB_IF_ROW2 struct, so try to deduce it otherwise
241     //         cf. http://msdn.microsoft.com/en-us/windows/desktop/ff568739(v=vs.100).aspx
242     multicast = row.AccessType == NET_IF_ACCESS_BROADCAST ||
243                 row.AccessType == NET_IF_ACCESS_POINT_TO_POINT;
244     hw->flags_ok =
245         (row.OperStatus == IfOperStatusUp) &&
246         !(row.Type == IF_TYPE_SOFTWARE_LOOPBACK) &&
247         multicast &&
248         (hw->monitor->server->config.allow_point_to_point || !(row.Type == IF_TYPE_PPP));
249             // XXX what about IF_TYPE_TUNNEL?
250
251     n = wcstombs(NULL, row.Alias, 0) + 1;
252     catta_free(hw->name);
253     hw->name = catta_new(char, n);
254     wcstombs(hw->name, row.Alias, n);
255
256     hw->mtu = row.Mtu;
257
258     hw->mac_address_size = row.PhysicalAddressLength;
259     if(hw->mac_address_size > CATTA_MAC_ADDRESS_MAX)
260         hw->mac_address_size = CATTA_MAC_ADDRESS_MAX;
261     memcpy(hw->mac_address, row.PhysicalAddress, hw->mac_address_size);
262
263     // XXX debugging, remove
264     {
265         char mac[256];
266         catta_log_debug(" name: %s\n"
267                         " mtu: %d\n"
268                         " mac: %s\n"
269                         " flags_ok: %d\n"
270                         "   type: %u\n"
271                         "   status: %u\n"
272                         "   multicast: %d\n"
273                         "   access type: %d",
274             hw->name,
275             hw->mtu,
276             catta_format_mac_address(mac, sizeof(mac), hw->mac_address, hw->mac_address_size),
277             hw->flags_ok,
278             (unsigned int)row.Type,
279             (unsigned int)row.OperStatus,
280             multicast,
281             (int)row.AccessType);
282     }
283
284     catta_hw_interface_check_relevant(hw);
285     catta_hw_interface_update_rrs(hw, 0);
286 }
287
288 static void handle_iface_event(CattaInterfaceMonitor *m, MIB_IPINTERFACE_ROW *row, MIB_NOTIFICATION_TYPE type)
289 {
290     CattaIfIndex idx = row->InterfaceIndex;
291     CattaProtocol proto = catta_af_to_proto(row->Family);
292     const char *protostr = catta_proto_to_string(proto);
293     CattaInterface *iface;
294     CattaHwInterface *hw;
295
296     // XXX debug, remove
297     {
298         const char *typestr = NULL;
299
300         switch(type) {
301             case MibParameterNotification:  typestr = "ParameterNotification"; break;
302             case MibAddInstance:            typestr = "AddInstance"; break;
303             case MibDeleteInstance:         typestr = "DeleteInstance"; break;
304             default:                        typestr = "Unknown";
305         }
306
307         catta_log_debug("interface %s on iface %d for %s", typestr, idx, protostr);
308     }
309
310     // see if we know this interface
311     iface = catta_interface_monitor_get_interface(m, idx, proto);
312     hw = iface ? iface->hardware : catta_interface_monitor_get_hw_interface(m, idx);
313
314     // print debug messages for some unexpected cases
315     if(type==MibParameterNotification && !iface)
316         catta_log_debug("ParameterNotification received for unknown interface %d (%s)", idx, protostr);
317     if(type==MibDeleteInstance && !iface)
318         catta_log_debug("DeleteInstance received for unknown interface %d (%s)", idx, protostr);
319     if(type==MibAddInstance && iface)
320         catta_log_debug("AddInstance received for existing interface %d (%s)", idx, protostr);
321     if(iface && !hw)
322         catta_log_debug("missing CattaHwInterface for interface %d (%s)", idx, protostr);
323
324     switch(type) {
325     case MibParameterNotification:
326     case MibAddInstance:
327         // create the physical interface if it is missing
328         if(!hw) {
329             if((hw = catta_hw_interface_new(m, idx)) == NULL) {
330                 catta_log_error("catta_hw_interface_new failed in handle_iface_event");
331                 return;
332             }
333         }
334
335         // create the protocol-specific interface if it is missing
336         if(!iface) {
337             if((iface = catta_interface_new(m, hw, proto)) == NULL) {
338                 catta_log_error("catta_interface_new failed in handle_iface_event");
339                 return;
340             }
341         }
342
343         assert(iface != NULL);
344         assert(hw != NULL);
345         assert(iface->hardware == hw);
346
347         update_hw_interface(hw);
348         break;
349     case MibDeleteInstance:
350         if(iface)
351             catta_interface_free(iface, 0);
352
353         // free the hardware interface when there are no more protocol-specific interfaces
354         if(hw && !hw->interfaces)
355             catta_hw_interface_free(hw, 0);
356         break;
357     default:
358         catta_log_debug("unexpected type (%d) of interface change notification received", type);
359     }
360 }
361
362 static void handle_addr_event(CattaInterfaceMonitor *m, MIB_UNICASTIPADDRESS_ROW *row, MIB_NOTIFICATION_TYPE type)
363 {
364     CattaIfIndex idx = row->InterfaceIndex;
365     CattaInterfaceAddress *ifaddr;
366     CattaInterface *iface;
367     CattaAddress addr;
368     const char *protostr;
369
370     // fill addr struct for address lookup
371     switch(row->Address.si_family) {
372     case AF_INET:
373         memcpy(addr.data.data, &row->Address.Ipv4.sin_addr, sizeof(struct in_addr));
374         break;
375     case AF_INET6:
376         memcpy(addr.data.data, &row->Address.Ipv6.sin6_addr, sizeof(struct in6_addr));
377         break;
378     default:
379         catta_log_debug("unexpected address family on interface %d: %u", idx, row->Address.si_family);
380         return;
381     }
382     addr.proto = catta_af_to_proto(row->Address.si_family);
383     protostr = catta_proto_to_string(addr.proto);
384
385     // XXX debug, remove
386     {
387         const char *typestr = NULL;
388         char buf[CATTA_ADDRESS_STR_MAX];
389
390         switch(type) {
391             case MibParameterNotification:  typestr = "ParameterNotification"; break;
392             case MibAddInstance:            typestr = "AddInstance"; break;
393             case MibDeleteInstance:         typestr = "DeleteInstance"; break;
394             default:                        typestr = "Unknown";
395         }
396
397         catta_log_debug("%s for %s address %s on iface %d",
398                         typestr, protostr,
399                         catta_address_snprint(buf, sizeof(buf), &addr),
400                         idx);
401     }
402
403     // see if we know this address/interface
404     iface = catta_interface_monitor_get_interface(m, idx, addr.proto);
405     ifaddr = iface ? catta_interface_monitor_get_address(m, iface, &addr) : NULL;
406
407     // print debug messages for some unexpected cases
408     if(type==MibParameterNotification && !ifaddr)
409         catta_log_debug("ParameterNotification received for unknown address on interface %d (%s)", idx, protostr);
410     if(type==MibDeleteInstance && !ifaddr)
411         catta_log_debug("DeleteInstance received for unknown address on interface %d (%s)", idx, protostr);
412     if(type==MibAddInstance && ifaddr)
413         catta_log_debug("AddInstance received for existing address on interface %d (%s)", idx, protostr);
414     if(ifaddr && !iface)
415         catta_log_debug("missing CattaInterface for address on interface %d (%s)", idx, protostr);
416
417     switch(type) {
418     case MibParameterNotification:
419     case MibAddInstance:
420         // fetch the full event data
421         if(GetUnicastIpAddressEntry(row) != NO_ERROR) {
422             catta_log_error("GetUnicastIpAddressEntry failed in handle_addr_event");
423             return;
424         }
425
426         // skip addresses that are not suitable as source addresses
427         if(row->SkipAsSource)
428             return;
429
430         // create the interface if it is missing
431         if(!iface) {
432             CattaHwInterface *hw;
433
434             if((hw = catta_interface_monitor_get_hw_interface(m, idx)) == NULL) {
435                 catta_log_error("interface %d not found in handle_addr_event", idx);
436                 return;
437             }
438
439             if((iface = catta_interface_new(m, hw, addr.proto)) == NULL) {
440                 catta_log_error("catta_interface_new failed in handle_addr_event");
441                 return;
442             }
443         }
444         assert(iface != NULL);
445
446         // create the interface-associated address if it is missing
447         if(!ifaddr) {
448             unsigned prefixlen = row->OnLinkPrefixLength;
449
450             if((ifaddr = catta_interface_address_new(m, iface, &addr, prefixlen)) == NULL) {
451                 catta_log_error("catta_interface_address_new failed in handle_addr_event");
452                 return;
453             }
454         }
455         assert(ifaddr != NULL);
456
457         set_global_scope_flag(ifaddr, &addr);
458         catta_log_debug("   global_scope: %d", ifaddr->global_scope); // XXX debugging, remove
459         break;
460     case MibDeleteInstance:
461         if(ifaddr)
462             catta_interface_address_free(ifaddr);
463         break;
464     default:
465         catta_log_debug("unexpected type (%d) of address change notification received", type);
466     }
467
468     if(iface) {
469         catta_interface_check_relevant(iface);
470         catta_interface_update_rrs(iface, 0);
471     }
472 }
473
474 static void handle_events(CattaInterfaceMonitor *m)
475 {
476     char buf[16];
477     ChangeEvent *ev;
478
479     if(!pthread_mutex_lock(&m->osdep.mutex)) {
480         // clear the pipe
481         while(readpipe(m->osdep.pipefd[0], buf, sizeof(buf)) == sizeof(buf)) {}
482
483         while((ev = m->osdep.events) != NULL) {
484             CATTA_LLIST_REMOVE(ChangeEvent, event, m->osdep.events, ev);
485
486             // dispatch to the appropriate handler
487             switch(ev->type) {
488             case INTERFACE_CHANGE_EVENT:
489                 handle_iface_event(m, &ev->data.iface, ev->notification_type);
490                 break;
491             case ADDRESS_CHANGE_EVENT:
492                 handle_addr_event(m, &ev->data.addr, ev->notification_type);
493                 break;
494             default:
495                 catta_log_debug("unhandled change event type in handle_events");
496             }
497
498             catta_free(ev);
499         }
500
501         pthread_mutex_unlock(&m->osdep.mutex);
502     }
503 }
504
505 static void pipe_callback(CattaWatch *w, int fd, CattaWatchEvent event, void *m)
506 {
507     // silence "unused parameter" warnings
508     (void)w;
509     (void)fd;
510     (void)event;
511
512     handle_events(m);
513 }
514
515
516 int catta_interface_monitor_init_osdep(CattaInterfaceMonitor *m)
517 {
518     DWORD r;
519
520     pthread_mutex_init(&m->osdep.mutex, NULL);
521
522     CATTA_LLIST_HEAD_INIT(ChangeEvent, m->osdep.events);
523
524     if(pipe(m->osdep.pipefd) < 0) {
525         catta_log_error("pipe() in catta_interface_monitor_init_osdep failed");
526         return -1;
527     }
528     catta_set_nonblock(m->osdep.pipefd[0]);
529     catta_set_nonblock(m->osdep.pipefd[1]);
530
531     m->osdep.icnhandle = NULL;
532     m->osdep.acnhandle = NULL;
533
534     // register handler for change events
535     m->osdep.watch = m->server->poll_api->watch_new(m->server->poll_api,
536                                                     m->osdep.pipefd[0],
537                                                     CATTA_WATCH_IN,
538                                                     pipe_callback,
539                                                     m);
540     if(!m->osdep.watch) {
541         catta_log_error(__FILE__": Failed to create watch.");
542         return -1;
543     }
544
545     // request async notification on interface changes
546     r = NotifyIpInterfaceChange(AF_UNSPEC,
547                                 // icn_callback needs to be WINAPI but
548                                 // MingW up to 3.1.0 erroneously defines
549                                 // PIPINTERFACE_CHANGE_CALLBACK without it
550                                 (PIPINTERFACE_CHANGE_CALLBACK)icn_callback,
551                                 m, FALSE, &m->osdep.icnhandle);
552     if(r != NO_ERROR)
553         catta_log_error("NotifyIpInterfaceChange failed: %u", (unsigned int)r);
554
555     // request async notification on address changes
556     r = NotifyUnicastIpAddressChange(AF_UNSPEC, acn_callback, m, FALSE,
557                                      &m->osdep.acnhandle);
558     if(r != NO_ERROR)
559         catta_log_error("NotifyUnicastIpAddressChange failed: %u", (unsigned int)r);
560
561     return 0;
562 }
563
564 void catta_interface_monitor_free_osdep(CattaInterfaceMonitor *m)
565 {
566     ChangeEvent *ev;
567
568     // unregister callbacks
569     if(m->osdep.icnhandle) CancelMibChangeNotify2(m->osdep.icnhandle);
570     if(m->osdep.acnhandle) CancelMibChangeNotify2(m->osdep.acnhandle);
571
572     // unregister event handler
573     m->server->poll_api->watch_free(m->osdep.watch);
574
575     // close pipe
576     closepipe(m->osdep.pipefd[0]);
577     closepipe(m->osdep.pipefd[1]);
578
579     // make sure no stray events can come in during destruction
580     pthread_mutex_lock(&m->osdep.mutex);
581
582     // free all events that are still in the queue
583     while((ev = m->osdep.events) != NULL) {
584         CATTA_LLIST_REMOVE(ChangeEvent, event, m->osdep.events, ev);
585         catta_free(ev);
586     }
587
588     pthread_mutex_unlock(&m->osdep.mutex);
589     pthread_mutex_destroy(&m->osdep.mutex);
590 }
591
592 void catta_interface_monitor_sync(CattaInterfaceMonitor *m)
593 {
594     IP_ADAPTER_ADDRESSES *buf = NULL;
595     IP_ADAPTER_ADDRESSES *p;
596     ULONG bufsize = 15000;
597     ULONG r;
598
599     // allocate a buffer and call GetAdaptersAddresses
600     // retry with the correct size if the buffer was too small
601     do {
602         catta_free(buf);    // no-op on first iteration
603         if((buf = catta_malloc(bufsize)) == NULL) {
604             catta_log_error("malloc failed in catta_interface_monitor_sync");
605             return;
606         }
607
608         r = GetAdaptersAddresses(AF_UNSPEC, 0, NULL, buf, &bufsize);
609     } while(r == ERROR_BUFFER_OVERFLOW);
610
611     if(r != NO_ERROR) {
612         catta_log_error("GetAdaptersAddresses failed: %u", (unsigned int)r);
613         return;
614     }
615
616     // XXX remove interfaces for adapters that are no longer in the list
617
618     // create 'CattaInterface's for every adapter
619     for(p=buf; p; p=p->Next)
620         ip_adapter(m, p);
621
622     catta_free(buf);
623
624     m->list_complete = 1;
625     catta_interface_monitor_check_relevant(m);
626     catta_interface_monitor_update_rrs(m, 0);
627     catta_log_info("Network interface enumeration completed.");
628 }