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