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1.1 misho 1: /*
2: * Copyright (C) 2004, 2005, 2007 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: ifiter_sysctl.c,v 1.25 2007/06/19 23:47:18 tbox Exp $ */
19:
20: /*! \file
21: * \brief
22: * Obtain the list of network interfaces using sysctl.
23: * See TCP/IP Illustrated Volume 2, sections 19.8, 19.14,
24: * and 19.16.
25: */
26:
27: #include <sys/param.h>
28: #include <sys/sysctl.h>
29:
30: #include <net/route.h>
31: #include <net/if_dl.h>
32:
33: /* XXX what about Alpha? */
34: #ifdef sgi
35: #define ROUNDUP(a) ((a) > 0 ? \
36: (1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) : \
37: sizeof(__uint64_t))
38: #else
39: #define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \
40: : sizeof(long))
41: #endif
42:
43: #define IFITER_MAGIC ISC_MAGIC('I', 'F', 'I', 'S')
44: #define VALID_IFITER(t) ISC_MAGIC_VALID(t, IFITER_MAGIC)
45:
46: struct isc_interfaceiter {
47: unsigned int magic; /* Magic number. */
48: isc_mem_t *mctx;
49: void *buf; /* Buffer for sysctl data. */
50: unsigned int bufsize; /* Bytes allocated. */
51: unsigned int bufused; /* Bytes used. */
52: unsigned int pos; /* Current offset in
53: sysctl data. */
54: isc_interface_t current; /* Current interface data. */
55: isc_result_t result; /* Last result code. */
56: };
57:
58: static int mib[6] = {
59: CTL_NET,
60: PF_ROUTE,
61: 0,
62: 0, /* Any address family. */
63: NET_RT_IFLIST,
64: 0 /* Flags. */
65: };
66:
67: isc_result_t
68: isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp) {
69: isc_interfaceiter_t *iter;
70: isc_result_t result;
71: size_t bufsize;
72: size_t bufused;
73: char strbuf[ISC_STRERRORSIZE];
74:
75: REQUIRE(mctx != NULL);
76: REQUIRE(iterp != NULL);
77: REQUIRE(*iterp == NULL);
78:
79: iter = isc_mem_get(mctx, sizeof(*iter));
80: if (iter == NULL)
81: return (ISC_R_NOMEMORY);
82:
83: iter->mctx = mctx;
84: iter->buf = 0;
85:
86: /*
87: * Determine the amount of memory needed.
88: */
89: bufsize = 0;
90: if (sysctl(mib, 6, NULL, &bufsize, NULL, (size_t) 0) < 0) {
91: isc__strerror(errno, strbuf, sizeof(strbuf));
92: UNEXPECTED_ERROR(__FILE__, __LINE__,
93: isc_msgcat_get(isc_msgcat,
94: ISC_MSGSET_IFITERSYSCTL,
95: ISC_MSG_GETIFLISTSIZE,
96: "getting interface "
97: "list size: sysctl: %s"),
98: strbuf);
99: result = ISC_R_UNEXPECTED;
100: goto failure;
101: }
102: iter->bufsize = bufsize;
103:
104: iter->buf = isc_mem_get(iter->mctx, iter->bufsize);
105: if (iter->buf == NULL) {
106: result = ISC_R_NOMEMORY;
107: goto failure;
108: }
109:
110: bufused = bufsize;
111: if (sysctl(mib, 6, iter->buf, &bufused, NULL, (size_t) 0) < 0) {
112: isc__strerror(errno, strbuf, sizeof(strbuf));
113: UNEXPECTED_ERROR(__FILE__, __LINE__,
114: isc_msgcat_get(isc_msgcat,
115: ISC_MSGSET_IFITERSYSCTL,
116: ISC_MSG_GETIFLIST,
117: "getting interface list: "
118: "sysctl: %s"),
119: strbuf);
120: result = ISC_R_UNEXPECTED;
121: goto failure;
122: }
123: iter->bufused = bufused;
124: INSIST(iter->bufused <= iter->bufsize);
125:
126: /*
127: * A newly created iterator has an undefined position
128: * until isc_interfaceiter_first() is called.
129: */
130: iter->pos = (unsigned int) -1;
131: iter->result = ISC_R_FAILURE;
132:
133: iter->magic = IFITER_MAGIC;
134: *iterp = iter;
135: return (ISC_R_SUCCESS);
136:
137: failure:
138: if (iter->buf != NULL)
139: isc_mem_put(mctx, iter->buf, iter->bufsize);
140: isc_mem_put(mctx, iter, sizeof(*iter));
141: return (result);
142: }
143:
144: /*
145: * Get information about the current interface to iter->current.
146: * If successful, return ISC_R_SUCCESS.
147: * If the interface has an unsupported address family,
148: * return ISC_R_IGNORE. In case of other failure,
149: * return ISC_R_UNEXPECTED.
150: */
151:
152: static isc_result_t
153: internal_current(isc_interfaceiter_t *iter) {
154: struct ifa_msghdr *ifam, *ifam_end;
155:
156: REQUIRE(VALID_IFITER(iter));
157: REQUIRE (iter->pos < (unsigned int) iter->bufused);
158:
159: ifam = (struct ifa_msghdr *) ((char *) iter->buf + iter->pos);
160: ifam_end = (struct ifa_msghdr *) ((char *) iter->buf + iter->bufused);
161:
162: if (ifam->ifam_type == RTM_IFINFO) {
163: struct if_msghdr *ifm = (struct if_msghdr *) ifam;
164: struct sockaddr_dl *sdl = (struct sockaddr_dl *) (ifm + 1);
165: unsigned int namelen;
166:
167: memset(&iter->current, 0, sizeof(iter->current));
168:
169: iter->current.ifindex = sdl->sdl_index;
170: namelen = sdl->sdl_nlen;
171: if (namelen > sizeof(iter->current.name) - 1)
172: namelen = sizeof(iter->current.name) - 1;
173:
174: memset(iter->current.name, 0, sizeof(iter->current.name));
175: memcpy(iter->current.name, sdl->sdl_data, namelen);
176:
177: iter->current.flags = 0;
178:
179: if ((ifam->ifam_flags & IFF_UP) != 0)
180: iter->current.flags |= INTERFACE_F_UP;
181:
182: if ((ifam->ifam_flags & IFF_POINTOPOINT) != 0)
183: iter->current.flags |= INTERFACE_F_POINTTOPOINT;
184:
185: if ((ifam->ifam_flags & IFF_LOOPBACK) != 0)
186: iter->current.flags |= INTERFACE_F_LOOPBACK;
187:
188: if ((ifam->ifam_flags & IFF_BROADCAST) != 0)
189: iter->current.flags |= INTERFACE_F_BROADCAST;
190:
191: #ifdef IFF_MULTICAST
192: if ((ifam->ifam_flags & IFF_MULTICAST) != 0)
193: iter->current.flags |= INTERFACE_F_MULTICAST;
194: #endif
195:
196: /*
197: * This is not an interface address.
198: * Force another iteration.
199: */
200: return (ISC_R_IGNORE);
201: } else if (ifam->ifam_type == RTM_NEWADDR) {
202: int i;
203: int family;
204: struct sockaddr *mask_sa = NULL;
205: struct sockaddr *addr_sa = NULL;
206: struct sockaddr *dst_sa = NULL;
207:
208: struct sockaddr *sa = (struct sockaddr *)(ifam + 1);
209: family = sa->sa_family;
210:
211: for (i = 0; i < RTAX_MAX; i++)
212: {
213: if ((ifam->ifam_addrs & (1 << i)) == 0)
214: continue;
215:
216: INSIST(sa < (struct sockaddr *) ifam_end);
217:
218: switch (i) {
219: case RTAX_NETMASK: /* Netmask */
220: mask_sa = sa;
221: break;
222: case RTAX_IFA: /* Interface address */
223: addr_sa = sa;
224: break;
225: case RTAX_BRD: /* Broadcast or destination address */
226: dst_sa = sa;
227: break;
228: }
229: #ifdef ISC_PLATFORM_HAVESALEN
230: sa = (struct sockaddr *)((char*)(sa)
231: + ROUNDUP(sa->sa_len));
232: #else
233: #ifdef sgi
234: /*
235: * Do as the contributed SGI code does.
236: */
237: sa = (struct sockaddr *)((char*)(sa)
238: + ROUNDUP(_FAKE_SA_LEN_DST(sa)));
239: #else
240: /* XXX untested. */
241: sa = (struct sockaddr *)((char*)(sa)
242: + ROUNDUP(sizeof(struct sockaddr)));
243: #endif
244: #endif
245: }
246:
247: if (addr_sa == NULL)
248: return (ISC_R_IGNORE);
249:
250: family = addr_sa->sa_family;
251: if (family != AF_INET && family != AF_INET6)
252: return (ISC_R_IGNORE);
253:
254: iter->current.af = family;
255:
256: get_addr(family, &iter->current.address, addr_sa,
257: iter->current.name);
258:
259: if (mask_sa != NULL)
260: get_addr(family, &iter->current.netmask, mask_sa,
261: iter->current.name);
262:
263: if (dst_sa != NULL &&
264: (iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0)
265: get_addr(family, &iter->current.dstaddress, dst_sa,
266: iter->current.name);
267:
268: if (dst_sa != NULL &&
269: (iter->current.flags & INTERFACE_F_BROADCAST) != 0)
270: get_addr(family, &iter->current.broadcast, dst_sa,
271: iter->current.name);
272:
273: return (ISC_R_SUCCESS);
274: } else {
275: printf(isc_msgcat_get(isc_msgcat, ISC_MSGSET_IFITERSYSCTL,
276: ISC_MSG_UNEXPECTEDTYPE,
277: "warning: unexpected interface list "
278: "message type\n"));
279: return (ISC_R_IGNORE);
280: }
281: }
282:
283: /*
284: * Step the iterator to the next interface. Unlike
285: * isc_interfaceiter_next(), this may leave the iterator
286: * positioned on an interface that will ultimately
287: * be ignored. Return ISC_R_NOMORE if there are no more
288: * interfaces, otherwise ISC_R_SUCCESS.
289: */
290: static isc_result_t
291: internal_next(isc_interfaceiter_t *iter) {
292: struct ifa_msghdr *ifam;
293: REQUIRE (iter->pos < (unsigned int) iter->bufused);
294:
295: ifam = (struct ifa_msghdr *) ((char *) iter->buf + iter->pos);
296:
297: iter->pos += ifam->ifam_msglen;
298:
299: if (iter->pos >= iter->bufused)
300: return (ISC_R_NOMORE);
301:
302: return (ISC_R_SUCCESS);
303: }
304:
305: static void
306: internal_destroy(isc_interfaceiter_t *iter) {
307: UNUSED(iter); /* Unused. */
308: /*
309: * Do nothing.
310: */
311: }
312:
313: static
314: void internal_first(isc_interfaceiter_t *iter) {
315: iter->pos = 0;
316: }