1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright (c) 1999 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <syslog.h>
32 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <sys/sockio.h>
35 #include <arpa/inet.h>
36 #include <net/if.h>
37 #include <unistd.h>
38 #include <netdb.h>
39 #include <nss_dbdefs.h>
40 #include <slp-internal.h>
41 #include <slp_net_utils.h>
42
43 typedef struct slp_ifinfo {
44 struct sockaddr_in addr;
45 struct sockaddr_in netmask;
46 struct sockaddr_in bc_addr;
47 short flags;
48 } slp_ifinfo_t;
49
50 typedef struct slp_handle_ifinfo {
51 slp_ifinfo_t *all_ifs;
52 int numifs;
53 } slp_handle_ifinfo_t;
54
55
56 static SLPError get_all_interfaces(slp_handle_ifinfo_t *info);
57
58 /*
59 * Obtains the broadcast addresses for all local interfaces given in
60 * addrs.
61 *
62 * hp IN / OUT holds cached-per-handle if info
63 * given_ifs IN an array of local interfaces
64 * num_givenifs IN number of addresses in given_ifs
65 * bc_addrs OUT an array of broadcast addresses for local interfaces
66 * num_addrs OUT number of addrs returned in bc_addrs
67 *
68 * Returns SLP_OK if at least one broadcast address was found; if none
69 * were found, returns err != SLP_OK and *bc_addrs = NULL;
70 * Caller must free *bc_addrs when done.
71 */
slp_broadcast_addrs(slp_handle_impl_t * hp,struct in_addr * given_ifs,int num_givenifs,struct sockaddr_in * bc_addrs[],int * num_addrs)72 SLPError slp_broadcast_addrs(slp_handle_impl_t *hp, struct in_addr *given_ifs,
73 int num_givenifs,
74 struct sockaddr_in *bc_addrs[],
75 int *num_addrs) {
76
77 SLPError err;
78 int i, j;
79 slp_ifinfo_t *all_ifs;
80 slp_handle_ifinfo_t *ifinfo;
81 int numifs;
82
83 if (!hp->ifinfo) {
84 if (!(ifinfo = malloc(sizeof (*ifinfo)))) {
85 slp_err(LOG_CRIT, 0, "slp_broadcast_addrs",
86 "out of memory");
87 return (SLP_MEMORY_ALLOC_FAILED);
88 }
89 if ((err = get_all_interfaces(ifinfo)) != SLP_OK) {
90 free(ifinfo);
91 return (err);
92 }
93 hp->ifinfo = ifinfo;
94 }
95 all_ifs = ((slp_handle_ifinfo_t *)hp->ifinfo)->all_ifs;
96 numifs = ((slp_handle_ifinfo_t *)hp->ifinfo)->numifs;
97
98 /* allocate memory for reply */
99 if (!(*bc_addrs = calloc(num_givenifs, sizeof (**bc_addrs)))) {
100 slp_err(LOG_CRIT, 0, "slp_broadcast_addrs", "out of memory");
101 return (SLP_MEMORY_ALLOC_FAILED);
102 }
103
104 /* copy bc addrs for all desired interfaces which are bc-enabled */
105 *num_addrs = 0;
106 for (j = 0; j < num_givenifs; j++) {
107 for (i = 0; i < numifs; i++) {
108
109 if (!(all_ifs[i].flags & IFF_BROADCAST)) {
110 continue;
111 }
112
113 if (memcmp(&(all_ifs[i].addr.sin_addr.s_addr),
114 &(given_ifs[j].s_addr),
115 sizeof (given_ifs[j].s_addr)) == 0 &&
116 all_ifs[i].bc_addr.sin_addr.s_addr != 0) {
117
118 /* got it, so copy it to bc_addrs */
119 (void) memcpy(
120 *bc_addrs + *num_addrs,
121 &(all_ifs[i].bc_addr),
122 sizeof (all_ifs[i].bc_addr));
123 (*num_addrs)++;
124
125 break;
126 }
127 }
128 }
129
130 if (*num_addrs == 0) {
131 /* none found */
132 free (*bc_addrs);
133 bc_addrs = NULL;
134 return (SLP_INTERNAL_SYSTEM_ERROR);
135 }
136 return (SLP_OK);
137 }
138
139 /*
140 * Returns true if addr is on a subnet local to the local host.
141 */
slp_on_subnet(slp_handle_impl_t * hp,struct in_addr addr)142 SLPBoolean slp_on_subnet(slp_handle_impl_t *hp, struct in_addr addr) {
143 int i;
144 struct in_addr netmask, net_addr, masked_addr;
145 slp_ifinfo_t *all_ifs;
146 slp_handle_ifinfo_t *ifinfo;
147 int numifs;
148
149 if (!hp->ifinfo) {
150 if (!(ifinfo = malloc(sizeof (*ifinfo)))) {
151 slp_err(LOG_CRIT, 0, "slp_broadcast_addrs",
152 "out of memory");
153 return (SLP_FALSE);
154 }
155 if (get_all_interfaces(ifinfo) != SLP_OK) {
156 free(ifinfo);
157 return (SLP_FALSE);
158 }
159 hp->ifinfo = ifinfo;
160 }
161 all_ifs = ((slp_handle_ifinfo_t *)hp->ifinfo)->all_ifs;
162 numifs = ((slp_handle_ifinfo_t *)hp->ifinfo)->numifs;
163
164 for (i = 0; i < numifs; i++) {
165 /* get netmask */
166 netmask.s_addr = all_ifs[i].netmask.sin_addr.s_addr;
167 /* get network address */
168 net_addr.s_addr =
169 all_ifs[i].addr.sin_addr.s_addr & netmask.s_addr;
170 /* apply netmask to input addr */
171 masked_addr.s_addr = addr.s_addr & netmask.s_addr;
172
173 if (memcmp(&(masked_addr.s_addr), &(net_addr.s_addr),
174 sizeof (net_addr.s_addr)) == 0) {
175 return (SLP_TRUE);
176 }
177 }
178
179 return (SLP_FALSE);
180 }
181
182 /*
183 * Returns true if any local interface if configured with addr.
184 */
slp_on_localhost(slp_handle_impl_t * hp,struct in_addr addr)185 SLPBoolean slp_on_localhost(slp_handle_impl_t *hp, struct in_addr addr) {
186 int i;
187 slp_ifinfo_t *all_ifs;
188 slp_handle_ifinfo_t *ifinfo;
189 int numifs;
190
191 if (!hp->ifinfo) {
192 if (!(ifinfo = malloc(sizeof (*ifinfo)))) {
193 slp_err(LOG_CRIT, 0, "slp_broadcast_addrs",
194 "out of memory");
195 return (SLP_FALSE);
196 }
197 if (get_all_interfaces(ifinfo) != SLP_OK) {
198 free(ifinfo);
199 return (SLP_FALSE);
200 }
201 hp->ifinfo = ifinfo;
202 }
203 all_ifs = ((slp_handle_ifinfo_t *)hp->ifinfo)->all_ifs;
204 numifs = ((slp_handle_ifinfo_t *)hp->ifinfo)->numifs;
205
206 for (i = 0; i < numifs; i++) {
207 if (memcmp(&(addr.s_addr), &(all_ifs[i].addr.sin_addr.s_addr),
208 sizeof (addr)) == 0) {
209
210 return (SLP_TRUE);
211 }
212 }
213
214 return (SLP_FALSE);
215 }
216
slp_free_ifinfo(void * hi)217 void slp_free_ifinfo(void *hi) {
218 free(((slp_handle_ifinfo_t *)hi)->all_ifs);
219 }
220
221 /*
222 * Populates all_ifs.
223 */
get_all_interfaces(slp_handle_ifinfo_t * info)224 static SLPError get_all_interfaces(slp_handle_ifinfo_t *info) {
225 int i, n, s = 0;
226 int numifs;
227 char *buf = NULL;
228 size_t bufsize;
229 struct ifconf ifc;
230 struct ifreq *ifrp, ifr;
231 slp_ifinfo_t *all_ifs = NULL;
232 SLPError err = SLP_OK;
233
234 /* create a socket with which to get interface info */
235 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
236 goto cleanup;
237 }
238
239 /* how many interfaces are configured? */
240 if (ioctl(s, SIOCGIFNUM, (char *)&numifs) < 0) {
241 goto cleanup;
242 }
243
244 /* allocate memory for ifinfo_t array */
245 if (!(all_ifs = calloc(numifs, sizeof (*all_ifs)))) {
246 slp_err(LOG_CRIT, 0, "get_all_interfaces", "out of memory");
247 err = SLP_MEMORY_ALLOC_FAILED;
248 goto cleanup;
249 }
250
251 /* allocate memory for interface info */
252 bufsize = numifs * sizeof (struct ifreq);
253 if (!(buf = malloc(bufsize))) {
254 slp_err(LOG_CRIT, 0, "get_all_interfaces", "out of memory");
255 err = SLP_MEMORY_ALLOC_FAILED;
256 goto cleanup;
257 }
258
259 /* get if info */
260 ifc.ifc_len = bufsize;
261 ifc.ifc_buf = buf;
262 if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
263 goto cleanup;
264 }
265
266 ifrp = ifc.ifc_req;
267 i = 0;
268 for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifrp++) {
269
270 /* ignore if interface is not up */
271 (void) memset((char *)&ifr, 0, sizeof (ifr));
272 (void) strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof (ifr.ifr_name));
273 if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
274 continue;
275 }
276 if (!(ifr.ifr_flags & IFF_UP)) {
277 continue;
278 }
279
280 all_ifs[i].flags = ifr.ifr_flags;
281
282 /* get the interface's address */
283 if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
284 continue;
285 }
286
287 (void) memcpy(&(all_ifs[i].addr), &ifr.ifr_addr,
288 sizeof (all_ifs[i].addr));
289
290 /* get the interface's broadcast address */
291 if (ioctl(s, SIOCGIFBRDADDR, (caddr_t)&ifr) < 0) {
292 (void) memset(&(all_ifs[i].bc_addr), 0,
293 sizeof (all_ifs[i].bc_addr));
294 } else {
295 (void) memcpy(&(all_ifs[i].bc_addr), &ifr.ifr_addr,
296 sizeof (all_ifs[i].bc_addr));
297 }
298
299 /* get the interface's subnet mask */
300 if (ioctl(s, SIOCGIFNETMASK, (caddr_t)&ifr) < 0) {
301 (void) memset(&(all_ifs[i].netmask), 0,
302 sizeof (all_ifs[i].netmask));
303 } else {
304 (void) memcpy(&(all_ifs[i].netmask), &ifr.ifr_addr,
305 sizeof (all_ifs[i].netmask));
306 }
307
308 i++;
309 }
310
311 /* i contains the number we actually got info on */
312 info->numifs = i;
313 info->all_ifs = all_ifs;
314
315 if (i == 0) {
316 err = SLP_INTERNAL_SYSTEM_ERROR;
317 free(all_ifs);
318 info->all_ifs = NULL;
319 }
320
321 cleanup:
322 if (s) (void) close(s);
323 if (buf) free(buf);
324
325 return (err);
326 }
327
328 /*
329 * Converts a SLPSrvURL to a network address. 'sa' must have been
330 * allocated by the caller.
331 * Assumes that addresses are given as specified in the protocol spec,
332 * i.e. as IP addresses and not host names.
333 */
slp_surl2sin(SLPSrvURL * surl,struct sockaddr_in * sa)334 SLPError slp_surl2sin(SLPSrvURL *surl, struct sockaddr_in *sa) {
335 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
336
337 if (slp_pton(surl->s_pcHost, &(sin->sin_addr)) < 1)
338 return (SLP_PARAMETER_BAD);
339 sin->sin_family = AF_INET;
340 /* port number */
341 sin->sin_port = htons(
342 (surl->s_iPort == 0 ? SLP_PORT : surl->s_iPort));
343
344 return (SLP_OK);
345 }
346
347 /*
348 * A wrapper around gethostbyaddr_r. This checks the useGetXXXbyYYY
349 * property first to determine whether a name service lookup should
350 * be used. If not, it converts the address in 'addr' to a string
351 * and just returns that.
352 *
353 * The core functionality herein will be replaced with getaddrinfo
354 * when it becomes available.
355 */
356
slp_gethostbyaddr(const char * addr,int size)357 char *slp_gethostbyaddr(const char *addr, int size) {
358 char storebuf[SLP_NETDB_BUFSZ], addrbuf[INET6_ADDRSTRLEN], *cname;
359 const char *use_xbyy;
360 struct hostent namestruct[1], *name;
361 int herrno;
362
363 /* default: copy in the IP address */
364 cname = slp_ntop(addrbuf, INET6_ADDRSTRLEN, (const void *) addr);
365 if (cname && !(cname = strdup(cname))) {
366 slp_err(LOG_CRIT, 0, "slp_gethostbyaddr", "out of memory");
367 return (NULL);
368 }
369
370 if ((use_xbyy = SLPGetProperty(SLP_CONFIG_USEGETXXXBYYYY)) != NULL &&
371 strcasecmp(use_xbyy, "false") == 0) {
372 return (cname);
373 }
374
375 while (!(name = gethostbyaddr_r(addr, size,
376 AF_INET,
377 namestruct,
378 storebuf,
379 SLP_NETDB_BUFSZ,
380 &herrno))) {
381 switch (herrno) {
382 case NO_RECOVERY:
383 case NO_DATA:
384 return (cname);
385 case TRY_AGAIN:
386 continue;
387 default:
388 return (cname); /* IP address */
389 }
390 }
391
392 free(cname);
393 if (!(cname = strdup(name->h_name))) {
394 slp_err(LOG_CRIT, 0, "slp_gethostbyaddr", "out of memory");
395 return (NULL);
396 }
397
398 return (cname);
399 }
400
401 /* @@@ currently getting these from libresolv2 -> change? */
402
403 /*
404 * Converts the address pointed to by 'addr' to a string. Currently
405 * just calls inet_ntoa, but is structured to be a wrapper to
406 * inet_ntop. Returns NULL on failure.
407 *
408 * This wrapper allows callers to be protocol agnostic. Right now it
409 * only handles IPv4.
410 */
411 /*ARGSUSED*/
slp_ntop(char * buf,int buflen,const void * addr)412 char *slp_ntop(char *buf, int buflen, const void *addr) {
413 return (inet_ntoa(*(struct in_addr *)addr));
414 }
415
416 /*
417 * convert from presentation format (which usually means ASCII printable)
418 * to network format (which is usually some kind of binary format).
419 * return:
420 * 1 if the address was valid for the specified address family
421 * 0 if the address wasn't valid (`dst' is untouched in this case)
422 * -1 if some other error occurred (`dst' is untouched in this case, too)
423 *
424 * This wrapper allows callers to be protocol agnostic. Right now it
425 * only handles IPv4.
426 */
slp_pton(const char * addrstr,void * addr)427 int slp_pton(const char *addrstr, void *addr) {
428 return (inet_pton(AF_INET, addrstr, addr));
429 }
430