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1.1 misho 1: /*
2: * Copyright (C) 2004, 2005, 2007-2009 Internet Systems Consortium, Inc. ("ISC")
3: * Copyright (C) 1999-2003 Internet Software Consortium.
4: *
5: * Permission to use, copy, modify, and/or distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10: * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11: * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12: * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13: * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14: * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15: * PERFORMANCE OF THIS SOFTWARE.
16: */
17:
18: /* $Id: interfaceiter.c,v 1.44.120.2 2009/02/16 23:47:15 tbox Exp $ */
19:
20: /*! \file */
21:
22: #include <config.h>
23:
24: #include <sys/types.h>
25: #include <sys/ioctl.h>
26: #ifdef HAVE_SYS_SOCKIO_H
27: #include <sys/sockio.h> /* Required for ifiter_ioctl.c. */
28: #endif
29:
30: #include <stdio.h>
31: #include <stdlib.h>
32: #include <unistd.h>
33: #include <errno.h>
34:
35: #include <isc/interfaceiter.h>
36: #include <isc/log.h>
37: #include <isc/magic.h>
38: #include <isc/mem.h>
39: #include <isc/msgs.h>
40: #include <isc/net.h>
41: #include <isc/print.h>
42: #include <isc/result.h>
43: #include <isc/strerror.h>
44: #include <isc/string.h>
45: #include <isc/types.h>
46: #include <isc/util.h>
47:
48: /* Must follow <isc/net.h>. */
49: #ifdef HAVE_NET_IF6_H
50: #include <net/if6.h>
51: #endif
52: #include <net/if.h>
53:
54: #ifdef HAVE_LINUX_IF_ADDR_H
55: # include <linux/if_addr.h>
56: #endif
57:
58: /* Common utility functions */
59:
60: /*%
61: * Extract the network address part from a "struct sockaddr".
62: * \brief
63: * The address family is given explicitly
64: * instead of using src->sa_family, because the latter does not work
65: * for copying a network mask obtained by SIOCGIFNETMASK (it does
66: * not have a valid address family).
67: */
68:
69: static void
70: get_addr(unsigned int family, isc_netaddr_t *dst, struct sockaddr *src,
71: char *ifname)
72: {
73: struct sockaddr_in6 *sa6;
74:
75: #if !defined(ISC_PLATFORM_HAVEIFNAMETOINDEX) || \
76: !defined(ISC_PLATFORM_HAVESCOPEID)
77: UNUSED(ifname);
78: #endif
79:
80: /* clear any remaining value for safety */
81: memset(dst, 0, sizeof(*dst));
82:
83: dst->family = family;
84: switch (family) {
85: case AF_INET:
86: memcpy(&dst->type.in,
87: &((struct sockaddr_in *)(void *)src)->sin_addr,
88: sizeof(struct in_addr));
89: break;
90: case AF_INET6:
91: sa6 = (struct sockaddr_in6 *)(void *)src;
92: memcpy(&dst->type.in6, &sa6->sin6_addr,
93: sizeof(struct in6_addr));
94: #ifdef ISC_PLATFORM_HAVESCOPEID
95: if (sa6->sin6_scope_id != 0)
96: isc_netaddr_setzone(dst, sa6->sin6_scope_id);
97: else {
98: /*
99: * BSD variants embed scope zone IDs in the 128bit
100: * address as a kernel internal form. Unfortunately,
101: * the embedded IDs are not hidden from applications
102: * when getting access to them by sysctl or ioctl.
103: * We convert the internal format to the pure address
104: * part and the zone ID part.
105: * Since multicast addresses should not appear here
106: * and they cannot be distinguished from netmasks,
107: * we only consider unicast link-local addresses.
108: */
109: if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
110: isc_uint16_t zone16;
111:
112: memcpy(&zone16, &sa6->sin6_addr.s6_addr[2],
113: sizeof(zone16));
114: zone16 = ntohs(zone16);
115: if (zone16 != 0) {
116: /* the zone ID is embedded */
117: isc_netaddr_setzone(dst,
118: (isc_uint32_t)zone16);
119: dst->type.in6.s6_addr[2] = 0;
120: dst->type.in6.s6_addr[3] = 0;
121: #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
122: } else if (ifname != NULL) {
123: unsigned int zone;
124:
125: /*
126: * sin6_scope_id is still not provided,
127: * but the corresponding interface name
128: * is know. Use the interface ID as
129: * the link ID.
130: */
131: zone = if_nametoindex(ifname);
132: if (zone != 0) {
133: isc_netaddr_setzone(dst,
134: (isc_uint32_t)zone);
135: }
136: #endif
137: }
138: }
139: }
140: #endif
141: break;
142: default:
143: INSIST(0);
144: break;
145: }
146: }
147:
148: /*
149: * Include system-dependent code.
150: */
151:
152: #ifdef __linux
153: #define ISC_IF_INET6_SZ \
154: sizeof("00000000000000000000000000000001 01 80 10 80 XXXXXXloXXXXXXXX\n")
155: static isc_result_t linux_if_inet6_next(isc_interfaceiter_t *);
156: static isc_result_t linux_if_inet6_current(isc_interfaceiter_t *);
157: static void linux_if_inet6_first(isc_interfaceiter_t *iter);
158: #endif
159:
160: #if HAVE_GETIFADDRS
161: #include "ifiter_getifaddrs.c"
162: #elif HAVE_IFLIST_SYSCTL
163: #include "ifiter_sysctl.c"
164: #else
165: #include "ifiter_ioctl.c"
166: #endif
167:
168: #ifdef __linux
169: static void
170: linux_if_inet6_first(isc_interfaceiter_t *iter) {
171: if (iter->proc != NULL) {
172: rewind(iter->proc);
173: (void)linux_if_inet6_next(iter);
174: } else
175: iter->valid = ISC_R_NOMORE;
176: }
177:
178: static isc_result_t
179: linux_if_inet6_next(isc_interfaceiter_t *iter) {
180: if (iter->proc != NULL &&
181: fgets(iter->entry, sizeof(iter->entry), iter->proc) != NULL)
182: iter->valid = ISC_R_SUCCESS;
183: else
184: iter->valid = ISC_R_NOMORE;
185: return (iter->valid);
186: }
187:
188: static isc_result_t
189: linux_if_inet6_current(isc_interfaceiter_t *iter) {
190: char address[33];
191: char name[IF_NAMESIZE+1];
192: char strbuf[ISC_STRERRORSIZE];
193: struct in6_addr addr6;
194: unsigned int ifindex;
195: int prefix, scope, flags;
196: struct ifreq ifreq;
197: int res;
198: unsigned int i;
199:
200: if (iter->valid != ISC_R_SUCCESS)
201: return (iter->valid);
202: if (iter->proc == NULL) {
203: isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
204: ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR,
205: "/proc/net/if_inet6:iter->proc == NULL");
206: return (ISC_R_FAILURE);
207: }
208:
209: res = sscanf(iter->entry, "%32[a-f0-9] %x %x %x %x %16s\n",
210: address, &ifindex, &prefix, &scope, &flags, name);
211: if (res != 6) {
212: isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
213: ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR,
214: "/proc/net/if_inet6:sscanf() -> %d (expected 6)",
215: res);
216: return (ISC_R_FAILURE);
217: }
218: if (strlen(address) != 32) {
219: isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
220: ISC_LOGMODULE_INTERFACE, ISC_LOG_ERROR,
221: "/proc/net/if_inet6:strlen(%s) != 32", address);
222: return (ISC_R_FAILURE);
223: }
224: /*
225: ** Ignore DAD addresses --
226: ** we can't bind to them until they are resolved
227: */
228: #ifdef IFA_F_TENTATIVE
229: if (flags & IFA_F_TENTATIVE)
230: return (ISC_R_IGNORE);
231: #endif
232:
233: for (i = 0; i < 16; i++) {
234: unsigned char byte;
235: static const char hex[] = "0123456789abcdef";
236: byte = ((strchr(hex, address[i * 2]) - hex) << 4) |
237: (strchr(hex, address[i * 2 + 1]) - hex);
238: addr6.s6_addr[i] = byte;
239: }
240: iter->current.af = AF_INET6;
241: iter->current.flags = 0;
242: memset(&ifreq, 0, sizeof(ifreq));
243: INSIST(sizeof(ifreq.ifr_name) <= sizeof(iter->current.name));
244: strncpy(ifreq.ifr_name, name, sizeof(ifreq.ifr_name));
245:
246: if (ioctl(iter->socket, SIOCGIFFLAGS, (char *) &ifreq) < 0) {
247: isc__strerror(errno, strbuf, sizeof(strbuf));
248: UNEXPECTED_ERROR(__FILE__, __LINE__,
249: "%s: getting interface flags: %s",
250: ifreq.ifr_name, strbuf);
251: return (ISC_R_IGNORE);
252: }
253:
254: if ((ifreq.ifr_flags & IFF_UP) != 0)
255: iter->current.flags |= INTERFACE_F_UP;
256: #ifdef IFF_POINTOPOINT
257: if ((ifreq.ifr_flags & IFF_POINTOPOINT) != 0)
258: iter->current.flags |= INTERFACE_F_POINTTOPOINT;
259: #endif
260: if ((ifreq.ifr_flags & IFF_LOOPBACK) != 0)
261: iter->current.flags |= INTERFACE_F_LOOPBACK;
262: if ((ifreq.ifr_flags & IFF_BROADCAST) != 0)
263: iter->current.flags |= INTERFACE_F_BROADCAST;
264: #ifdef IFF_MULTICAST
265: if ((ifreq.ifr_flags & IFF_MULTICAST) != 0)
266: iter->current.flags |= INTERFACE_F_MULTICAST;
267: #endif
268:
269: isc_netaddr_fromin6(&iter->current.address, &addr6);
270: iter->current.ifindex = ifindex;
271: if (isc_netaddr_islinklocal(&iter->current.address)) {
272: isc_netaddr_setzone(&iter->current.address,
273: (isc_uint32_t)ifindex);
274: }
275: for (i = 0; i < 16; i++) {
276: if (prefix > 8) {
277: addr6.s6_addr[i] = 0xff;
278: prefix -= 8;
279: } else {
280: addr6.s6_addr[i] = (0xff << (8 - prefix)) & 0xff;
281: prefix = 0;
282: }
283: }
284: isc_netaddr_fromin6(&iter->current.netmask, &addr6);
285: strncpy(iter->current.name, name, sizeof(iter->current.name));
286: return (ISC_R_SUCCESS);
287: }
288: #endif
289:
290: /*
291: * The remaining code is common to the sysctl and ioctl case.
292: */
293:
294: isc_result_t
295: isc_interfaceiter_current(isc_interfaceiter_t *iter,
296: isc_interface_t *ifdata)
297: {
298: REQUIRE(iter->result == ISC_R_SUCCESS);
299: memcpy(ifdata, &iter->current, sizeof(*ifdata));
300: return (ISC_R_SUCCESS);
301: }
302:
303: isc_result_t
304: isc_interfaceiter_first(isc_interfaceiter_t *iter) {
305: isc_result_t result;
306:
307: REQUIRE(VALID_IFITER(iter));
308:
309: internal_first(iter);
310: for (;;) {
311: result = internal_current(iter);
312: if (result != ISC_R_IGNORE)
313: break;
314: result = internal_next(iter);
315: if (result != ISC_R_SUCCESS)
316: break;
317: }
318: iter->result = result;
319: return (result);
320: }
321:
322: isc_result_t
323: isc_interfaceiter_next(isc_interfaceiter_t *iter) {
324: isc_result_t result;
325:
326: REQUIRE(VALID_IFITER(iter));
327: REQUIRE(iter->result == ISC_R_SUCCESS);
328:
329: for (;;) {
330: result = internal_next(iter);
331: if (result != ISC_R_SUCCESS)
332: break;
333: result = internal_current(iter);
334: if (result != ISC_R_IGNORE)
335: break;
336: }
337: iter->result = result;
338: return (result);
339: }
340:
341: void
342: isc_interfaceiter_destroy(isc_interfaceiter_t **iterp)
343: {
344: isc_interfaceiter_t *iter;
345: REQUIRE(iterp != NULL);
346: iter = *iterp;
347: REQUIRE(VALID_IFITER(iter));
348:
349: internal_destroy(iter);
350: if (iter->buf != NULL)
351: isc_mem_put(iter->mctx, iter->buf, iter->bufsize);
352:
353: iter->magic = 0;
354: isc_mem_put(iter->mctx, iter, sizeof(*iter));
355: *iterp = NULL;
356: }