xref: /illumos-gate/usr/src/lib/libresolv2/common/irs/irp_ho.c (revision 458f44a49dc56cd17a39815122214e7a1b4793e3)
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