1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
|
/* IPV6 base transport support functions
*/
#include <net-snmp/net-snmp-config.h>
#ifdef NETSNMP_ENABLE_IPV6
#include <net-snmp/types.h>
#include <net-snmp/library/snmpIPv6BaseDomain.h>
#include <net-snmp/library/system.h>
#include <stddef.h>
#include <stdio.h>
#include <sys/types.h>
#include <ctype.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#if HAVE_NET_IF_H
#include <net/if.h>
#endif
#if HAVE_DMALLOC_H
#include <dmalloc.h>
#endif
#include <net-snmp/types.h>
#include <net-snmp/library/snmp_debug.h>
#include <net-snmp/library/default_store.h>
#include <net-snmp/library/snmp_logging.h>
#include "inet_ntop.h"
#include "inet_pton.h"
#if defined(WIN32) && !defined(IF_NAMESIZE)
#define IF_NAMESIZE 12
#endif
#if defined(HAVE_WINSOCK_H) && !defined(mingw32)
static const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
#endif
static unsigned
netsnmp_if_nametoindex(const char *ifname)
{
#if defined(WIN32)
return atoi(ifname);
#elif defined(HAVE_IF_NAMETOINDEX)
return if_nametoindex(ifname);
#else
return 0;
#endif
}
static char *
netsnmp_if_indextoname(unsigned ifindex, char *ifname)
{
#if defined(WIN32)
snprintf(ifname, IF_NAMESIZE, "%u", ifindex);
return ifname;
#elif defined(HAVE_IF_NAMETOINDEX)
return if_indextoname(ifindex, ifname);
#else
return NULL;
#endif
}
char *
netsnmp_ipv6_fmtaddr(const char *prefix, netsnmp_transport *t,
void *data, int len)
{
struct sockaddr_in6 *to = NULL;
char addr[INET6_ADDRSTRLEN];
char tmp[INET6_ADDRSTRLEN + 18];
DEBUGMSGTL(("netsnmp_ipv6", "fmtaddr: t = %p, data = %p, len = %d\n", t,
data, len));
if (data != NULL && len == sizeof(struct sockaddr_in6)) {
to = (struct sockaddr_in6 *) data;
} else if (t != NULL && t->data != NULL) {
to = (struct sockaddr_in6 *) t->data;
}
if (to == NULL) {
snprintf(tmp, sizeof(tmp), "%s: unknown", prefix);
} else {
char scope_id[IF_NAMESIZE + 1] = "";
#if defined(HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID)
if (to->sin6_scope_id
&& netsnmp_if_indextoname(to->sin6_scope_id, &scope_id[1])) {
scope_id[0] = '%';
}
#endif
snprintf(tmp, sizeof(tmp), "%s: [%s%s]:%hu", prefix,
inet_ntop(AF_INET6, (void *) &(to->sin6_addr), addr,
INET6_ADDRSTRLEN), scope_id, ntohs(to->sin6_port));
}
tmp[sizeof(tmp)-1] = '\0';
return strdup(tmp);
}
int
netsnmp_sockaddr_in6_2(struct sockaddr_in6 *addr,
const char *inpeername, const char *default_target)
{
char *cp = NULL, *peername = NULL;
char debug_addr[INET6_ADDRSTRLEN];
#if HAVE_GETADDRINFO
struct addrinfo *addrs = NULL;
int err;
#elif HAVE_GETIPNODEBYNAME
struct hostent *hp = NULL;
int err;
#elif HAVE_GETHOSTBYNAME
struct hostent *hp = NULL;
#endif
int portno;
if (addr == NULL) {
return 0;
}
DEBUGMSGTL(("netsnmp_sockaddr_in6",
"addr %p, peername \"%s\", default_target \"%s\"\n",
addr, inpeername ? inpeername : "[NIL]",
default_target ? default_target : "[NIL]"));
memset(addr, 0, sizeof(struct sockaddr_in6));
addr->sin6_family = AF_INET6;
addr->sin6_addr = in6addr_any;
addr->sin6_port = htons((u_short)SNMP_PORT);
{
int port = netsnmp_ds_get_int(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DEFAULT_PORT);
if (port != 0)
addr->sin6_port = htons((u_short)port);
else if (default_target != NULL)
netsnmp_sockaddr_in6_2(addr, default_target, NULL);
}
if (inpeername != NULL) {
/*
* Duplicate the peername because we might want to mank around with
* it.
*/
peername = strdup(inpeername);
if (peername == NULL) {
return 0;
}
for (cp = peername; *cp && isdigit((unsigned char) *cp); cp++);
portno = atoi(peername);
if (!*cp && portno != 0) {
/*
* Okay, it looks like JUST a port number.
*/
DEBUGMSGTL(("netsnmp_sockaddr_in6", "totally numeric: %d\n",
portno));
addr->sin6_port = htons((u_short)portno);
goto resolved;
}
/*
* See if it is an IPv6 address covered with square brackets. Also check
* for an appended :port.
*/
if (*peername == '[') {
cp = strchr(peername, ']');
if (cp != NULL) {
/*
* See if it is an IPv6 link-local address with interface
* name as <zone_id>, like fe80::1234%eth0.
* Please refer to the internet draft, IPv6 Scoped Address Architecture
* http://www.ietf.org/internet-drafts/draft-ietf-ipngwg-scoping-arch-04.txt
*
*/
char *scope_id;
unsigned int if_index = 0;
*cp = '\0';
scope_id = strchr(peername + 1, '%');
if (scope_id != NULL) {
*scope_id = '\0';
if_index = netsnmp_if_nametoindex(scope_id + 1);
}
if (*(cp + 1) == ':') {
portno = atoi(cp+2);
if (portno != 0 &&
inet_pton(AF_INET6, peername + 1,
(void *) &(addr->sin6_addr))) {
DEBUGMSGTL(("netsnmp_sockaddr_in6",
"IPv6 address with port suffix :%d\n",
portno));
if (portno > 0 && portno < 0xffff) {
addr->sin6_port = htons((u_short)portno);
} else {
DEBUGMSGTL(("netsnmp_sockaddr_in6", "invalid port number: %d", portno));
return 0;
}
#if defined(HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID)
addr->sin6_scope_id = if_index;
#endif
goto resolved;
}
} else {
if (inet_pton
(AF_INET6, peername + 1,
(void *) &(addr->sin6_addr))) {
DEBUGMSGTL(("netsnmp_sockaddr_in6",
"IPv6 address with square brackets\n"));
portno = netsnmp_ds_get_int(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DEFAULT_PORT);
if (portno <= 0)
portno = SNMP_PORT;
addr->sin6_port = htons((u_short)portno);
#if defined(HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID)
addr->sin6_scope_id = if_index;
#endif
goto resolved;
}
}
if (scope_id != NULL) {
*scope_id = '%';
}
*cp = ']';
}
}
cp = strrchr(peername, ':');
if (cp != NULL) {
char *scope_id;
unsigned int if_index = 0;
*cp = '\0';
scope_id = strchr(peername + 1, '%');
if (scope_id != NULL) {
*scope_id = '\0';
if_index = netsnmp_if_nametoindex(scope_id + 1);
}
portno = atoi(cp + 1);
if (portno != 0 &&
inet_pton(AF_INET6, peername,
(void *) &(addr->sin6_addr))) {
DEBUGMSGTL(("netsnmp_sockaddr_in6",
"IPv6 address with port suffix :%d\n",
atoi(cp + 1)));
if (portno > 0 && portno < 0xffff) {
addr->sin6_port = htons((u_short)portno);
} else {
DEBUGMSGTL(("netsnmp_sockaddr_in6", "invalid port number: %d", portno));
return 0;
}
#if defined(HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID)
addr->sin6_scope_id = if_index;
#endif
goto resolved;
}
if (scope_id != NULL) {
*scope_id = '%';
}
*cp = ':';
}
/*
* See if it is JUST an IPv6 address.
*/
if (inet_pton(AF_INET6, peername, (void *) &(addr->sin6_addr))) {
DEBUGMSGTL(("netsnmp_sockaddr_in6", "just IPv6 address\n"));
goto resolved;
}
/*
* Well, it must be a hostname then, possibly with an appended :port.
* Sort that out first.
*/
cp = strrchr(peername, ':');
if (cp != NULL) {
*cp = '\0';
portno = atoi(cp + 1);
if (portno != 0) {
DEBUGMSGTL(("netsnmp_sockaddr_in6",
"hostname(?) with port suffix :%d\n",
portno));
if (portno > 0 && portno < 0xffff) {
addr->sin6_port = htons((u_short)portno);
} else {
DEBUGMSGTL(("netsnmp_sockaddr_in6", "invalid port number: %d", portno));
return 0;
}
} else {
/*
* No idea, looks bogus but we might as well pass the full thing to
* the name resolver below.
*/
*cp = ':';
DEBUGMSGTL(("netsnmp_sockaddr_in6",
"hostname(?) with embedded ':'?\n"));
}
/*
* Fall through.
*/
}
if (peername[0] == '\0') {
DEBUGMSGTL(("netsnmp_sockaddr_in6", "empty hostname\n"));
free(peername);
return 0;
}
#if HAVE_GETADDRINFO
{
struct addrinfo hint = { 0 };
hint.ai_flags = 0;
hint.ai_family = PF_INET6;
hint.ai_socktype = SOCK_DGRAM;
hint.ai_protocol = 0;
err = netsnmp_getaddrinfo(peername, NULL, &hint, &addrs);
}
if (err != 0) {
#if HAVE_GAI_STRERROR
snmp_log(LOG_ERR, "getaddrinfo(\"%s\", NULL, ...): %s\n", peername,
gai_strerror(err));
#else
snmp_log(LOG_ERR, "getaddrinfo(\"%s\", NULL, ...): (error %d)\n",
peername, err);
#endif
free(peername);
return 0;
}
if (addrs != NULL) {
DEBUGMSGTL(("netsnmp_sockaddr_in6", "hostname (resolved okay)\n"));
memcpy(&addr->sin6_addr,
&((struct sockaddr_in6 *) addrs->ai_addr)->sin6_addr,
sizeof(struct in6_addr));
freeaddrinfo(addrs);
}
else {
DEBUGMSGTL(("netsnmp_sockaddr_in6", "Failed to resolve IPv6 hostname\n"));
}
#elif HAVE_GETIPNODEBYNAME
hp = getipnodebyname(peername, AF_INET6, 0, &err);
if (hp == NULL) {
DEBUGMSGTL(("netsnmp_sockaddr_in6",
"hostname (couldn't resolve = %d)\n", err));
free(peername);
return 0;
}
DEBUGMSGTL(("netsnmp_sockaddr_in6", "hostname (resolved okay)\n"));
memcpy(&(addr->sin6_addr), hp->h_addr, hp->h_length);
#elif HAVE_GETHOSTBYNAME
hp = netsnmp_gethostbyname(peername);
if (hp == NULL) {
DEBUGMSGTL(("netsnmp_sockaddr_in6",
"hostname (couldn't resolve)\n"));
free(peername);
return 0;
} else {
if (hp->h_addrtype != AF_INET6) {
DEBUGMSGTL(("netsnmp_sockaddr_in6",
"hostname (not AF_INET6!)\n"));
free(peername);
return 0;
} else {
DEBUGMSGTL(("netsnmp_sockaddr_in6",
"hostname (resolved okay)\n"));
memcpy(&(addr->sin6_addr), hp->h_addr, hp->h_length);
}
}
#else /*HAVE_GETHOSTBYNAME */
/*
* There is no name resolving function available.
*/
snmp_log(LOG_ERR,
"no getaddrinfo()/getipnodebyname()/gethostbyname()\n");
free(peername);
return 0;
#endif /*HAVE_GETHOSTBYNAME */
} else {
DEBUGMSGTL(("netsnmp_sockaddr_in6", "NULL peername"));
return 0;
}
resolved:
DEBUGMSGTL(("netsnmp_sockaddr_in6", "return { AF_INET6, [%s]:%hu }\n",
inet_ntop(AF_INET6, &addr->sin6_addr, debug_addr,
sizeof(debug_addr)), ntohs(addr->sin6_port)));
free(peername);
return 1;
}
int
netsnmp_sockaddr_in6(struct sockaddr_in6 *addr,
const char *inpeername, int remote_port)
{
char buf[sizeof(remote_port) * 3 + 2];
sprintf(buf, ":%u", remote_port);
return netsnmp_sockaddr_in6_2(addr, inpeername, remote_port ? buf : NULL);
}
#endif /* NETSNMP_ENABLE_IPV6 */
|
