contrib/bind-9.5.2/lib/bind/irs/gen.c

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