1 /*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Portions Copyright (c) 1996,1998 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and 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
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 /* Imports. */
19
20 #include "port_before.h"
21
22 #include <syslog.h>
23 #include <sys/types.h>
24 #include <sys/param.h>
25 #include <sys/socket.h>
26
27 #include <netinet/in.h>
28 #include <arpa/inet.h>
29 #include <arpa/nameser.h>
30
31 #include <ctype.h>
32 #include <errno.h>
33 #include <fcntl.h>
34 #include <netdb.h>
35 #include <resolv.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <syslog.h>
40
41 #include <irs.h>
42 #include <irp.h>
43 #include <isc/irpmarshall.h>
44 #include <isc/memcluster.h>
45
46 #include "irs_p.h"
47 #include "dns_p.h"
48 #include "irp_p.h"
49
50 #include "port_after.h"
51
52 /* Definitions. */
53
54 #define MAXALIASES 35
55 #define MAXADDRS 35
56 #define Max(a,b) ((a) > (b) ? (a) : (b))
57
58
59 struct pvt {
60 struct irp_p *girpdata;
61 int warned;
62 struct hostent host;
63 };
64
65 /* Forward. */
66
67 static void ho_close(struct irs_ho *this);
68 static struct hostent * ho_byname(struct irs_ho *this, const char *name);
69 static struct hostent * ho_byname2(struct irs_ho *this, const char *name,
70 int af);
71 static struct hostent * ho_byaddr(struct irs_ho *this, const void *addr,
72 int len, int af);
73 static struct hostent * ho_next(struct irs_ho *this);
74 static void ho_rewind(struct irs_ho *this);
75 static void ho_minimize(struct irs_ho *this);
76
77 static void free_host(struct hostent *ho);
78 static struct addrinfo * ho_addrinfo(struct irs_ho *this, const char *name,
79 const struct addrinfo *pai);
80
81 /* Public. */
82
83 /*%
84 * struct irs_ho * irs_irp_ho(struct irs_acc *this)
85 *
86 * Notes:
87 *
88 * Initializes the irp_ho module.
89 *
90 */
91
92 struct irs_ho *
irs_irp_ho(struct irs_acc * this)93 irs_irp_ho(struct irs_acc *this) {
94 struct irs_ho *ho;
95 struct pvt *pvt;
96
97 if (!(ho = memget(sizeof *ho))) {
98 errno = ENOMEM;
99 return (NULL);
100 }
101 memset(ho, 0x0, sizeof *ho);
102
103 if (!(pvt = memget(sizeof *pvt))) {
104 memput(ho, sizeof *ho);
105 errno = ENOMEM;
106 return (NULL);
107 }
108 memset(pvt, 0, sizeof *pvt);
109 pvt->girpdata = this->private;
110
111 ho->private = pvt;
112 ho->close = ho_close;
113 ho->byname = ho_byname;
114 ho->byname2 = ho_byname2;
115 ho->byaddr = ho_byaddr;
116 ho->next = ho_next;
117 ho->rewind = ho_rewind;
118 ho->minimize = ho_minimize;
119 ho->addrinfo = ho_addrinfo;
120
121 return (ho);
122 }
123
124 /* Methods. */
125
126 /*%
127 * Closes down the module.
128 *
129 */
130
131 static void
ho_close(struct irs_ho * this)132 ho_close(struct irs_ho *this) {
133 struct pvt *pvt = (struct pvt *)this->private;
134
135 ho_minimize(this);
136
137 free_host(&pvt->host);
138
139 memput(pvt, sizeof *pvt);
140 memput(this, sizeof *this);
141 }
142
143
144
145 /*
146 * struct hostent * ho_byname(struct irs_ho *this, const char *name)
147 *
148 */
149
150 static struct hostent *
ho_byname(struct irs_ho * this,const char * name)151 ho_byname(struct irs_ho *this, const char *name) {
152 return (ho_byname2(this, name, AF_INET));
153 }
154
155
156
157
158
159 /*
160 * struct hostent * ho_byname2(struct irs_ho *this, const char *name, int af)
161 *
162 */
163
164 static struct hostent *
ho_byname2(struct irs_ho * this,const char * name,int af)165 ho_byname2(struct irs_ho *this, const char *name, int af) {
166 struct pvt *pvt = (struct pvt *)this->private;
167 struct hostent *ho = &pvt->host;
168 char *body = NULL;
169 size_t bodylen;
170 int code;
171 char text[256];
172
173 if (ho->h_name != NULL &&
174 strcmp(name, ho->h_name) == 0 &&
175 af == ho->h_addrtype) {
176 return (ho);
177 }
178
179 if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
180 return (NULL);
181 }
182
183 if (irs_irp_send_command(pvt->girpdata, "gethostbyname2 %s %s",
184 name, ADDR_T_STR(af)) != 0)
185 return (NULL);
186
187 if (irs_irp_get_full_response(pvt->girpdata, &code,
188 text, sizeof text,
189 &body, &bodylen) != 0) {
190 return (NULL);
191 }
192
193 if (code == IRPD_GETHOST_OK) {
194 free_host(ho);
195 if (irp_unmarshall_ho(ho, body) != 0) {
196 ho = NULL;
197 }
198 } else {
199 ho = NULL;
200 }
201
202 if (body != NULL) {
203 memput(body, bodylen);
204 }
205
206 return (ho);
207 }
208
209
210
211 /*
212 * struct hostent * ho_byaddr(struct irs_ho *this, const void *addr,
213 * int len, int af)
214 *
215 */
216
217 static struct hostent *
ho_byaddr(struct irs_ho * this,const void * addr,int len,int af)218 ho_byaddr(struct irs_ho *this, const void *addr, int len, int af) {
219 struct pvt *pvt = (struct pvt *)this->private;
220 struct hostent *ho = &pvt->host;
221 char *body = NULL;
222 size_t bodylen;
223 int code;
224 char **p;
225 char paddr[MAXPADDRSIZE];
226 char text[256];
227
228 if (ho->h_name != NULL &&
229 af == ho->h_addrtype &&
230 len == ho->h_length) {
231 for (p = ho->h_addr_list ; *p != NULL ; p++) {
232 if (memcmp(*p, addr, len) == 0)
233 return (ho);
234 }
235 }
236
237 if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
238 return (NULL);
239 }
240
241 if (inet_ntop(af, addr, paddr, sizeof paddr) == NULL) {
242 return (NULL);
243 }
244
245 if (irs_irp_send_command(pvt->girpdata, "gethostbyaddr %s %s",
246 paddr, ADDR_T_STR(af)) != 0) {
247 return (NULL);
248 }
249
250 if (irs_irp_get_full_response(pvt->girpdata, &code,
251 text, sizeof text,
252 &body, &bodylen) != 0) {
253 return (NULL);
254 }
255
256 if (code == IRPD_GETHOST_OK) {
257 free_host(ho);
258 if (irp_unmarshall_ho(ho, body) != 0) {
259 ho = NULL;
260 }
261 } else {
262 ho = NULL;
263 }
264
265 if (body != NULL) {
266 memput(body, bodylen);
267 }
268
269 return (ho);
270 }
271
272 /*%
273 * The implementation for gethostent(3). The first time it's
274 * called all the data is pulled from the remote(i.e. what
275 * the maximum number of gethostent(3) calls would return)
276 * and that data is cached.
277 *
278 */
279
280 static struct hostent *
ho_next(struct irs_ho * this)281 ho_next(struct irs_ho *this) {
282 struct pvt *pvt = (struct pvt *)this->private;
283 struct hostent *ho = &pvt->host;
284 char *body;
285 size_t bodylen;
286 int code;
287 char text[256];
288
289 if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
290 return (NULL);
291 }
292
293 if (irs_irp_send_command(pvt->girpdata, "gethostent") != 0) {
294 return (NULL);
295 }
296
297 if (irs_irp_get_full_response(pvt->girpdata, &code,
298 text, sizeof text,
299 &body, &bodylen) != 0) {
300 return (NULL);
301 }
302
303 if (code == IRPD_GETHOST_OK) {
304 free_host(ho);
305 if (irp_unmarshall_ho(ho, body) != 0) {
306 ho = NULL;
307 }
308 } else {
309 ho = NULL;
310 }
311
312 if (body != NULL) {
313 memput(body, bodylen);
314 }
315
316 return (ho);
317 }
318
319 /*%
320 * void ho_rewind(struct irs_ho *this)
321 *
322 */
323
324 static void
ho_rewind(struct irs_ho * this)325 ho_rewind(struct irs_ho *this) {
326 struct pvt *pvt = (struct pvt *)this->private;
327 char text[256];
328 int code;
329
330 if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
331 return;
332 }
333
334 if (irs_irp_send_command(pvt->girpdata, "sethostent") != 0) {
335 return;
336 }
337
338 code = irs_irp_read_response(pvt->girpdata, text, sizeof text);
339 if (code != IRPD_GETHOST_SETOK) {
340 if (irp_log_errors) {
341 syslog(LOG_WARNING, "sethostent failed: %s", text);
342 }
343 }
344
345 return;
346 }
347
348 /*%
349 * void ho_minimize(struct irs_ho *this)
350 *
351 */
352
353 static void
ho_minimize(struct irs_ho * this)354 ho_minimize(struct irs_ho *this) {
355 struct pvt *pvt = (struct pvt *)this->private;
356
357 free_host(&pvt->host);
358
359 irs_irp_disconnect(pvt->girpdata);
360 }
361
362 /*%
363 * void free_host(struct hostent *ho)
364 *
365 */
366
367 static void
free_host(struct hostent * ho)368 free_host(struct hostent *ho) {
369 char **p;
370
371 if (ho == NULL) {
372 return;
373 }
374
375 if (ho->h_name != NULL)
376 free(ho->h_name);
377
378 if (ho->h_aliases != NULL) {
379 for (p = ho->h_aliases ; *p != NULL ; p++)
380 free(*p);
381 free(ho->h_aliases);
382 }
383
384 if (ho->h_addr_list != NULL) {
385 for (p = ho->h_addr_list ; *p != NULL ; p++)
386 free(*p);
387 free(ho->h_addr_list);
388 }
389 }
390
391 /* dummy */
392 static struct addrinfo *
ho_addrinfo(struct irs_ho * this,const char * name,const struct addrinfo * pai)393 ho_addrinfo(struct irs_ho *this, const char *name, const struct addrinfo *pai)
394 {
395 UNUSED(this);
396 UNUSED(name);
397 UNUSED(pai);
398 return(NULL);
399 }
400
401 /*! \file */
402