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 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id: irp_ho.c,v 1.3 2005/04/27 04:56:28 sra Exp $";
20 #endif /* LIBC_SCCS and not lint */
21 
22 /* Imports. */
23 
24 #include "port_before.h"
25 
26 #include <syslog.h>
27 #include <sys/types.h>
28 #include <sys/param.h>
29 #include <sys/socket.h>
30 
31 #include <netinet/in.h>
32 #include <arpa/inet.h>
33 #include <arpa/nameser.h>
34 
35 #include <ctype.h>
36 #include <errno.h>
37 #include <fcntl.h>
38 #include <netdb.h>
39 #include <resolv.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <syslog.h>
44 
45 #include <irs.h>
46 #include <irp.h>
47 #include <isc/irpmarshall.h>
48 #include <isc/memcluster.h>
49 
50 #include "irs_p.h"
51 #include "dns_p.h"
52 #include "irp_p.h"
53 
54 #include "port_after.h"
55 
56 /* Definitions. */
57 
58 #define	MAXALIASES	35
59 #define	MAXADDRS	35
60 #define	Max(a,b)	((a) > (b) ? (a) : (b))
61 
62 
63 struct pvt {
64 	struct irp_p	       *girpdata;
65 	int			warned;
66 	struct hostent		host;
67 };
68 
69 /* Forward. */
70 
71 static void		ho_close(struct irs_ho *this);
72 static struct hostent *	ho_byname(struct irs_ho *this, const char *name);
73 static struct hostent *	ho_byname2(struct irs_ho *this, const char *name,
74 				   int af);
75 static struct hostent *	ho_byaddr(struct irs_ho *this, const void *addr,
76 				  int len, int af);
77 static struct hostent *	ho_next(struct irs_ho *this);
78 static void		ho_rewind(struct irs_ho *this);
79 static void		ho_minimize(struct irs_ho *this);
80 
81 static void		free_host(struct hostent *ho);
82 static struct addrinfo * ho_addrinfo(struct irs_ho *this, const char *name,
83 				     const struct addrinfo *pai);
84 
85 /* Public. */
86 
87 /*%
88  * struct irs_ho * irs_irp_ho(struct irs_acc *this)
89  *
90  * Notes:
91  *
92  *	Initializes the irp_ho module.
93  *
94  */
95 
96 struct irs_ho *
97 irs_irp_ho(struct irs_acc *this) {
98 	struct irs_ho *ho;
99 	struct pvt *pvt;
100 
101 	if (!(ho = memget(sizeof *ho))) {
102 		errno = ENOMEM;
103 		return (NULL);
104 	}
105 	memset(ho, 0x0, sizeof *ho);
106 
107 	if (!(pvt = memget(sizeof *pvt))) {
108 		memput(ho, sizeof *ho);
109 		errno = ENOMEM;
110 		return (NULL);
111 	}
112 	memset(pvt, 0, sizeof *pvt);
113 	pvt->girpdata = this->private;
114 
115 	ho->private = pvt;
116 	ho->close = ho_close;
117 	ho->byname = ho_byname;
118 	ho->byname2 = ho_byname2;
119 	ho->byaddr = ho_byaddr;
120 	ho->next = ho_next;
121 	ho->rewind = ho_rewind;
122 	ho->minimize = ho_minimize;
123 	ho->addrinfo = ho_addrinfo;
124 
125 	return (ho);
126 }
127 
128 /* Methods. */
129 
130 /*%
131  *	Closes down the module.
132  *
133  */
134 
135 static void
136 ho_close(struct irs_ho *this) {
137 	struct pvt *pvt = (struct pvt *)this->private;
138 
139 	ho_minimize(this);
140 
141 	free_host(&pvt->host);
142 
143 	memput(pvt, sizeof *pvt);
144 	memput(this, sizeof *this);
145 }
146 
147 
148 
149 /*
150  * struct hostent * ho_byname(struct irs_ho *this, const char *name)
151  *
152  */
153 
154 static struct hostent *
155 ho_byname(struct irs_ho *this, const char *name) {
156 	return (ho_byname2(this, name, AF_INET));
157 }
158 
159 
160 
161 
162 
163 /*
164  * struct hostent * ho_byname2(struct irs_ho *this, const char *name, int af)
165  *
166  */
167 
168 static struct hostent *
169 ho_byname2(struct irs_ho *this, const char *name, int af) {
170 	struct pvt *pvt = (struct pvt *)this->private;
171 	struct hostent *ho = &pvt->host;
172 	char *body = NULL;
173 	size_t bodylen;
174 	int code;
175 	char text[256];
176 
177 	if (ho->h_name != NULL &&
178 	    strcmp(name, ho->h_name) == 0 &&
179 	    af == ho->h_addrtype) {
180 		return (ho);
181 	}
182 
183 	if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
184 		return (NULL);
185 	}
186 
187 	if (irs_irp_send_command(pvt->girpdata, "gethostbyname2 %s %s",
188 				 name, ADDR_T_STR(af)) != 0)
189 		return (NULL);
190 
191 	if (irs_irp_get_full_response(pvt->girpdata, &code,
192 				      text, sizeof text,
193 				      &body, &bodylen) != 0) {
194 		return (NULL);
195 	}
196 
197 	if (code == IRPD_GETHOST_OK) {
198 		free_host(ho);
199 		if (irp_unmarshall_ho(ho, body) != 0) {
200 			ho = NULL;
201 		}
202 	} else {
203 		ho = NULL;
204 	}
205 
206 	if (body != NULL) {
207 		memput(body, bodylen);
208 	}
209 
210 	return (ho);
211 }
212 
213 
214 
215 /*
216  * struct hostent * ho_byaddr(struct irs_ho *this, const void *addr,
217  *			   int len, int af)
218  *
219  */
220 
221 static struct hostent *
222 ho_byaddr(struct irs_ho *this, const void *addr, int len, int af) {
223 	struct pvt *pvt = (struct pvt *)this->private;
224 	struct hostent *ho = &pvt->host;
225 	char *body = NULL;
226 	size_t bodylen;
227 	int code;
228 	char **p;
229 	char paddr[MAXPADDRSIZE];
230 	char text[256];
231 
232 	if (ho->h_name != NULL &&
233 	    af == ho->h_addrtype &&
234 	    len == ho->h_length) {
235 		for (p = ho->h_addr_list ; *p != NULL ; p++) {
236 			if (memcmp(*p, addr, len) == 0)
237 				return (ho);
238 		}
239 	}
240 
241 	if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
242 		return (NULL);
243 	}
244 
245 	if (inet_ntop(af, addr, paddr, sizeof paddr) == NULL) {
246 		return (NULL);
247 	}
248 
249 	if (irs_irp_send_command(pvt->girpdata, "gethostbyaddr %s %s",
250 				 paddr, ADDR_T_STR(af)) != 0) {
251 		return (NULL);
252 	}
253 
254 	if (irs_irp_get_full_response(pvt->girpdata, &code,
255 				      text, sizeof text,
256 				      &body, &bodylen) != 0) {
257 		return (NULL);
258 	}
259 
260 	if (code == IRPD_GETHOST_OK) {
261 		free_host(ho);
262 		if (irp_unmarshall_ho(ho, body) != 0) {
263 			ho = NULL;
264 		}
265 	} else {
266 		ho = NULL;
267 	}
268 
269 	if (body != NULL) {
270 		memput(body, bodylen);
271 	}
272 
273 	return (ho);
274 }
275 
276 /*%
277  *	The implementation for gethostent(3). The first time it's
278  *	called all the data is pulled from the remote(i.e. what
279  *	the maximum number of gethostent(3) calls would return)
280  *	and that data is cached.
281  *
282  */
283 
284 static struct hostent *
285 ho_next(struct irs_ho *this) {
286 	struct pvt *pvt = (struct pvt *)this->private;
287 	struct hostent *ho = &pvt->host;
288 	char *body;
289 	size_t bodylen;
290 	int code;
291 	char text[256];
292 
293 	if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
294 		return (NULL);
295 	}
296 
297 	if (irs_irp_send_command(pvt->girpdata, "gethostent") != 0) {
298 		return (NULL);
299 	}
300 
301 	if (irs_irp_get_full_response(pvt->girpdata, &code,
302 				      text, sizeof text,
303 				      &body, &bodylen) != 0) {
304 		return (NULL);
305 	}
306 
307 	if (code == IRPD_GETHOST_OK) {
308 		free_host(ho);
309 		if (irp_unmarshall_ho(ho, body) != 0) {
310 			ho = NULL;
311 		}
312 	} else {
313 		ho = NULL;
314 	}
315 
316 	if (body != NULL) {
317 		memput(body, bodylen);
318 	}
319 
320 	return (ho);
321 }
322 
323 /*%
324  * void ho_rewind(struct irs_ho *this)
325  *
326  */
327 
328 static void
329 ho_rewind(struct irs_ho *this) {
330 	struct pvt *pvt = (struct pvt *)this->private;
331 	char text[256];
332 	int code;
333 
334 	if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
335 		return;
336 	}
337 
338 	if (irs_irp_send_command(pvt->girpdata, "sethostent") != 0) {
339 		return;
340 	}
341 
342 	code = irs_irp_read_response(pvt->girpdata, text, sizeof text);
343 	if (code != IRPD_GETHOST_SETOK) {
344 		if (irp_log_errors) {
345 			syslog(LOG_WARNING, "sethostent failed: %s", text);
346 		}
347 	}
348 
349 	return;
350 }
351 
352 /*%
353  * void ho_minimize(struct irs_ho *this)
354  *
355  */
356 
357 static void
358 ho_minimize(struct irs_ho *this) {
359 	struct pvt *pvt = (struct pvt *)this->private;
360 
361 	free_host(&pvt->host);
362 
363 	irs_irp_disconnect(pvt->girpdata);
364 }
365 
366 /*%
367  * void free_host(struct hostent *ho)
368  *
369  */
370 
371 static void
372 free_host(struct hostent *ho) {
373 	char **p;
374 
375 	if (ho == NULL) {
376 		return;
377 	}
378 
379 	if (ho->h_name != NULL)
380 		free(ho->h_name);
381 
382 	if (ho->h_aliases != NULL) {
383 		for (p = ho->h_aliases ; *p != NULL ; p++)
384 			free(*p);
385 		free(ho->h_aliases);
386 	}
387 
388 	if (ho->h_addr_list != NULL) {
389 		for (p = ho->h_addr_list ; *p != NULL ; p++)
390 			free(*p);
391 		free(ho->h_addr_list);
392 	}
393 }
394 
395 /* dummy */
396 static struct addrinfo *
397 ho_addrinfo(struct irs_ho *this, const char *name, const struct addrinfo *pai)
398 {
399 	UNUSED(this);
400 	UNUSED(name);
401 	UNUSED(pai);
402 	return(NULL);
403 }
404 
405 /*! \file */
406