1 /*
2 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6
7 /*
8 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
9 * Copyright (c) 1996-1999 by Internet Software Consortium.
10 *
11 * Permission to use, copy, modify, and distribute this software for any
12 * purpose with or without fee is hereby granted, provided that the above
13 * copyright notice and this permission notice appear in all copies.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
16 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
17 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
18 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
21 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 */
23
24 #if !defined(LINT) && !defined(CODECENTER)
25 static const char rcsid[] = "$Id: gen.c,v 1.7 2005/04/27 04:56:23 sra Exp $";
26 #endif
27
28 /*! \file
29 * \brief
30 * this is the top level dispatcher
31 *
32 * The dispatcher is implemented as an accessor class; it is an
33 * accessor class that calls other accessor classes, as controlled by a
34 * configuration file.
35 *
36 * A big difference between this accessor class and others is that the
37 * map class initializers are NULL, and the map classes are already
38 * filled in with method functions that will do the right thing.
39 */
40
41 /* Imports */
42
43 #include "port_before.h"
44
45 #include <isc/assertions.h>
46 #include <ctype.h>
47 #include <errno.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51
52 #include <sys/types.h>
53 #include <netinet/in.h>
54 #include <arpa/nameser.h>
55 #include <resolv.h>
56
57 #include <isc/memcluster.h>
58 #include <irs.h>
59
60 #include "port_after.h"
61
62 #include "irs_p.h"
63 #include "gen_p.h"
64
65 #ifdef SUNW_HOSTS_FALLBACK
66 extern int __res_no_hosts_fallback(void);
67 #endif /* SUNW_HOSTS_FALLBACK */
68
69 /* Definitions */
70
71 struct nameval {
72 const char * name;
73 int val;
74 };
75
76 static const struct nameval acc_names[irs_nacc+1] = {
77 { "local", irs_lcl },
78 { "dns", irs_dns },
79 { "nis", irs_nis },
80 { "irp", irs_irp },
81 { NULL, irs_nacc }
82 };
83
84 typedef struct irs_acc *(*accinit) __P((const char *options));
85
86 static const accinit accs[irs_nacc+1] = {
87 irs_lcl_acc,
88 irs_dns_acc,
89 #ifdef WANT_IRS_NIS
90 irs_nis_acc,
91 #else
92 NULL,
93 #endif
94 irs_irp_acc,
95 NULL
96 };
97
98 static const struct nameval map_names[irs_nmap+1] = {
99 { "group", irs_gr },
100 { "passwd", irs_pw },
101 { "services", irs_sv },
102 { "protocols", irs_pr },
103 { "hosts", irs_ho },
104 { "networks", irs_nw },
105 { "netgroup", irs_ng },
106 { NULL, irs_nmap }
107 };
108
109 static const struct nameval option_names[] = {
110 { "merge", IRS_MERGE },
111 { "continue", IRS_CONTINUE },
112 { NULL, 0 }
113 };
114
115 /* Forward */
116
117 static void gen_close(struct irs_acc *);
118 static struct __res_state * gen_res_get(struct irs_acc *);
119 static void gen_res_set(struct irs_acc *, struct __res_state *,
120 void (*)(void *));
121 static int find_name(const char *, const struct nameval nv[]);
122 static void init_map_rules(struct gen_p *, const char *conf_file);
123 static struct irs_rule *release_rule(struct irs_rule *);
124 static int add_rule(struct gen_p *,
125 enum irs_map_id, enum irs_acc_id,
126 const char *);
127
128 /* Public */
129
130 struct irs_acc *
irs_gen_acc(const char * options,const char * conf_file)131 irs_gen_acc(const char *options, const char *conf_file) {
132 struct irs_acc *acc;
133 struct gen_p *irs;
134
135 if (!(acc = memget(sizeof *acc))) {
136 errno = ENOMEM;
137 return (NULL);
138 }
139 memset(acc, 0x5e, sizeof *acc);
140 if (!(irs = memget(sizeof *irs))) {
141 errno = ENOMEM;
142 memput(acc, sizeof *acc);
143 return (NULL);
144 }
145 memset(irs, 0x5e, sizeof *irs);
146 irs->options = strdup(options);
147 irs->res = NULL;
148 irs->free_res = NULL;
149 memset(irs->accessors, 0, sizeof irs->accessors);
150 memset(irs->map_rules, 0, sizeof irs->map_rules);
151 init_map_rules(irs, conf_file);
152 acc->private = irs;
153 #ifdef WANT_IRS_GR
154 acc->gr_map = irs_gen_gr;
155 #else
156 acc->gr_map = NULL;
157 #endif
158 #ifdef WANT_IRS_PW
159 acc->pw_map = irs_gen_pw;
160 #else
161 acc->pw_map = NULL;
162 #endif
163 acc->sv_map = irs_gen_sv;
164 acc->pr_map = irs_gen_pr;
165 acc->ho_map = irs_gen_ho;
166 acc->nw_map = irs_gen_nw;
167 acc->ng_map = irs_gen_ng;
168 acc->res_get = gen_res_get;
169 acc->res_set = gen_res_set;
170 acc->close = gen_close;
171 return (acc);
172 }
173
174 /* Methods */
175
176 static struct __res_state *
gen_res_get(struct irs_acc * this)177 gen_res_get(struct irs_acc *this) {
178 struct gen_p *irs = (struct gen_p *)this->private;
179
180 if (irs->res == NULL) {
181 struct __res_state *res;
182 res = (struct __res_state *)malloc(sizeof *res);
183 if (res == NULL)
184 return (NULL);
185 memset(res, 0, sizeof *res);
186 gen_res_set(this, res, free);
187 }
188
189 if (((irs->res->options & RES_INIT) == 0U) && res_ninit(irs->res) < 0)
190 return (NULL);
191
192 return (irs->res);
193 }
194
195 static void
gen_res_set(struct irs_acc * this,struct __res_state * res,void (* free_res)(void *))196 gen_res_set(struct irs_acc *this, struct __res_state *res,
197 void (*free_res)(void *)) {
198 struct gen_p *irs = (struct gen_p *)this->private;
199 #if 0
200 struct irs_rule *rule;
201 struct irs_ho *ho;
202 struct irs_nw *nw;
203 #endif
204
205 if (irs->res && irs->free_res) {
206 res_nclose(irs->res);
207 (*irs->free_res)(irs->res);
208 }
209
210 irs->res = res;
211 irs->free_res = free_res;
212
213 #if 0
214 for (rule = irs->map_rules[irs_ho]; rule; rule = rule->next) {
215 ho = rule->inst->ho;
216
217 (*ho->res_set)(ho, res, NULL);
218 }
219 for (rule = irs->map_rules[irs_nw]; rule; rule = rule->next) {
220 nw = rule->inst->nw;
221
222 (*nw->res_set)(nw, res, NULL);
223 }
224 #endif
225 }
226
227 static void
gen_close(struct irs_acc * this)228 gen_close(struct irs_acc *this) {
229 struct gen_p *irs = (struct gen_p *)this->private;
230 int n;
231
232 /* Search rules. */
233 for (n = 0; n < irs_nmap; n++)
234 while (irs->map_rules[n] != NULL)
235 irs->map_rules[n] = release_rule(irs->map_rules[n]);
236
237 /* Access methods. */
238 for (n = 0; n < irs_nacc; n++) {
239 /* Map objects. */
240 if (irs->accessors[n].gr != NULL)
241 (*irs->accessors[n].gr->close)(irs->accessors[n].gr);
242 if (irs->accessors[n].pw != NULL)
243 (*irs->accessors[n].pw->close)(irs->accessors[n].pw);
244 if (irs->accessors[n].sv != NULL)
245 (*irs->accessors[n].sv->close)(irs->accessors[n].sv);
246 if (irs->accessors[n].pr != NULL)
247 (*irs->accessors[n].pr->close)(irs->accessors[n].pr);
248 if (irs->accessors[n].ho != NULL)
249 (*irs->accessors[n].ho->close)(irs->accessors[n].ho);
250 if (irs->accessors[n].nw != NULL)
251 (*irs->accessors[n].nw->close)(irs->accessors[n].nw);
252 if (irs->accessors[n].ng != NULL)
253 (*irs->accessors[n].ng->close)(irs->accessors[n].ng);
254 /* Enclosing accessor. */
255 if (irs->accessors[n].acc != NULL)
256 (*irs->accessors[n].acc->close)(irs->accessors[n].acc);
257 }
258
259 /* The options string was strdup'd. */
260 free((void*)irs->options);
261
262 if (irs->res && irs->free_res)
263 (*irs->free_res)(irs->res);
264
265 /* The private data container. */
266 memput(irs, sizeof *irs);
267
268 /* The object. */
269 memput(this, sizeof *this);
270 }
271
272 /* Private */
273
274 static int
find_name(const char * name,const struct nameval names[])275 find_name(const char *name, const struct nameval names[]) {
276 int n;
277
278 for (n = 0; names[n].name != NULL; n++)
279 if (strcmp(name, names[n].name) == 0)
280 return (names[n].val);
281 return (-1);
282 }
283
284 static struct irs_rule *
release_rule(struct irs_rule * rule)285 release_rule(struct irs_rule *rule) {
286 struct irs_rule *next = rule->next;
287
288 memput(rule, sizeof *rule);
289 return (next);
290 }
291
292 static int
add_rule(struct gen_p * irs,enum irs_map_id map,enum irs_acc_id acc,const char * options)293 add_rule(struct gen_p *irs,
294 enum irs_map_id map, enum irs_acc_id acc,
295 const char *options)
296 {
297 struct irs_rule **rules, *last, *tmp, *new;
298 struct irs_inst *inst;
299 const char *cp;
300 int n;
301
302 #ifndef WANT_IRS_GR
303 if (map == irs_gr)
304 return (-1);
305 #endif
306 #ifndef WANT_IRS_PW
307 if (map == irs_pw)
308 return (-1);
309 #endif
310 #ifndef WANT_IRS_NIS
311 if (acc == irs_nis)
312 return (-1);
313 #endif
314 new = memget(sizeof *new);
315 if (new == NULL)
316 return (-1);
317 memset(new, 0x5e, sizeof *new);
318 new->next = NULL;
319
320 new->inst = &irs->accessors[acc];
321
322 new->flags = 0;
323 cp = options;
324 while (cp && *cp) {
325 char option[50], *next;
326
327 next = strchr(cp, ',');
328 if (next)
329 n = next++ - cp;
330 else
331 n = strlen(cp);
332 if ((size_t)n > sizeof option - 1)
333 n = sizeof option - 1;
334 strncpy(option, cp, n);
335 option[n] = '\0';
336
337 n = find_name(option, option_names);
338 if (n >= 0)
339 new->flags |= n;
340
341 cp = next;
342 }
343
344 rules = &irs->map_rules[map];
345 for (last = NULL, tmp = *rules;
346 tmp != NULL;
347 last = tmp, tmp = tmp->next)
348 (void)NULL;
349 if (last == NULL)
350 *rules = new;
351 else
352 last->next = new;
353
354 /* Try to instantiate map accessors for this if necessary & approp. */
355 inst = &irs->accessors[acc];
356 if (inst->acc == NULL && accs[acc] != NULL)
357 inst->acc = (*accs[acc])(irs->options);
358 if (inst->acc != NULL) {
359 if (inst->gr == NULL && inst->acc->gr_map != NULL)
360 inst->gr = (*inst->acc->gr_map)(inst->acc);
361 if (inst->pw == NULL && inst->acc->pw_map != NULL)
362 inst->pw = (*inst->acc->pw_map)(inst->acc);
363 if (inst->sv == NULL && inst->acc->sv_map != NULL)
364 inst->sv = (*inst->acc->sv_map)(inst->acc);
365 if (inst->pr == NULL && inst->acc->pr_map != NULL)
366 inst->pr = (*inst->acc->pr_map)(inst->acc);
367 if (inst->ho == NULL && inst->acc->ho_map != NULL)
368 inst->ho = (*inst->acc->ho_map)(inst->acc);
369 if (inst->nw == NULL && inst->acc->nw_map != NULL)
370 inst->nw = (*inst->acc->nw_map)(inst->acc);
371 if (inst->ng == NULL && inst->acc->ng_map != NULL)
372 inst->ng = (*inst->acc->ng_map)(inst->acc);
373 }
374
375 return (0);
376 }
377
378 static void
default_map_rules(struct gen_p * irs)379 default_map_rules(struct gen_p *irs) {
380 /* Install time honoured and proved BSD style rules as default. */
381 add_rule(irs, irs_gr, irs_lcl, "");
382 add_rule(irs, irs_pw, irs_lcl, "");
383 add_rule(irs, irs_sv, irs_lcl, "");
384 add_rule(irs, irs_pr, irs_lcl, "");
385 #ifdef SUNW_HOSTS_FALLBACK
386 if (__res_no_hosts_fallback())
387 add_rule(irs, irs_ho, irs_dns, "");
388 else {
389 add_rule(irs, irs_ho, irs_dns, "continue");
390 add_rule(irs, irs_ho, irs_lcl, "");
391 }
392 #else /* SUNW_HOSTS_FALLBACK */
393 add_rule(irs, irs_ho, irs_dns, "continue");
394 add_rule(irs, irs_ho, irs_lcl, "");
395 #endif /* SUNW_HOSTS_FALLBACK */
396 add_rule(irs, irs_nw, irs_dns, "continue");
397 add_rule(irs, irs_nw, irs_lcl, "");
398 add_rule(irs, irs_ng, irs_lcl, "");
399 }
400
401 static void
init_map_rules(struct gen_p * irs,const char * conf_file)402 init_map_rules(struct gen_p *irs, const char *conf_file) {
403 char line[1024], pattern[40], mapname[20], accname[20], options[100];
404 FILE *conf;
405
406 #ifdef SUNW_HOSTS_FALLBACK
407 if (__res_no_hosts_fallback()) {
408 default_map_rules(irs);
409 return;
410 }
411 #endif /* SUNW_HOSTS_FALLBACK */
412
413 if (conf_file == NULL)
414 conf_file = _PATH_IRS_CONF ;
415
416 /* A conf file of "" means compiled in defaults. Irpd wants this */
417 if (conf_file[0] == '\0' || (conf = fopen(conf_file, "r")) == NULL) {
418 default_map_rules(irs);
419 return;
420 }
421 (void) sprintf(pattern, "%%%lus %%%lus %%%lus\n",
422 (unsigned long)sizeof mapname,
423 (unsigned long)sizeof accname,
424 (unsigned long)sizeof options);
425 while (fgets(line, sizeof line, conf)) {
426 enum irs_map_id map;
427 enum irs_acc_id acc;
428 char *tmp;
429 int n;
430
431 for (tmp = line;
432 isascii((unsigned char)*tmp) &&
433 isspace((unsigned char)*tmp);
434 tmp++)
435 (void)NULL;
436 if (*tmp == '#' || *tmp == '\n' || *tmp == '\0')
437 continue;
438 n = sscanf(tmp, pattern, mapname, accname, options);
439 if (n < 2)
440 continue;
441 if (n < 3)
442 options[0] = '\0';
443
444 n = find_name(mapname, map_names);
445 INSIST(n < irs_nmap);
446 if (n < 0)
447 continue;
448 map = (enum irs_map_id) n;
449
450 n = find_name(accname, acc_names);
451 INSIST(n < irs_nacc);
452 if (n < 0)
453 continue;
454 acc = (enum irs_acc_id) n;
455
456 add_rule(irs, map, acc, options);
457 }
458 fclose(conf);
459 }
460