contrib/bind-9.2.4rc7/lib/bind/irs/lcl_nw.c

   1 /*
   2  * Copyright (c) 1989, 1993, 1995
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  36  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  37  *
  38  * Permission to use, copy, modify, and distribute this software for any
  39  * purpose with or without fee is hereby granted, provided that the above
  40  * copyright notice and this permission notice appear in all copies.
  41  *
  42  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  43  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  44  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  45  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  46  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  47  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  48  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  49  */
  50
  51 #if defined(LIBC_SCCS) && !defined(lint)
  52 static const char rcsid[] = "$Id: lcl_nw.c,v 1.1.2.2 2004/03/17 00:40:13 marka Exp $";
  53 /* from getgrent.c 8.2 (Berkeley) 3/21/94"; */
  54 /* from BSDI Id: getgrent.c,v 2.8 1996/05/28 18:15:14 bostic Exp $      */
  55 #endif /* LIBC_SCCS and not lint */
  56
  57 /* Imports */
  58
  59 #include "port_before.h"
  60
  61 #include <sys/types.h>
  62 #include <sys/socket.h>
  63
  64 #include <netinet/in.h>
  65 #include <arpa/inet.h>
  66 #include <arpa/nameser.h>
  67
  68 #include <errno.h>
  69 #include <fcntl.h>
  70 #include <resolv.h>
  71 #include <stdio.h>
  72 #include <stdlib.h>
  73 #include <string.h>
  74
  75 #include <irs.h>
  76 #include <isc/memcluster.h>
  77
  78 #include "port_after.h"
  79
  80 #include <isc/misc.h>
  81 #include "irs_p.h"
  82 #include "lcl_p.h"
  83
  84 #define MAXALIASES 35
  85 #define MAXADDRSIZE 4
  86
  87 struct pvt {
  88         FILE *          fp;
  89         char            line[BUFSIZ+1];
  90         struct nwent    net;
  91         char *          aliases[MAXALIASES];
  92         char            addr[MAXADDRSIZE];
  93         struct __res_state *  res;
  94         void            (*free_res)(void *);
  95 };
  96
  97 /* Forward */
  98
  99 static void             nw_close(struct irs_nw *);
 100 static struct nwent *   nw_byname(struct irs_nw *, const char *, int);
 101 static struct nwent *   nw_byaddr(struct irs_nw *, void *, int, int);
 102 static struct nwent *   nw_next(struct irs_nw *);
 103 static void             nw_rewind(struct irs_nw *);
 104 static void             nw_minimize(struct irs_nw *);
 105 static struct __res_state * nw_res_get(struct irs_nw *this);
 106 static void             nw_res_set(struct irs_nw *this,
 107                                    struct __res_state *res,
 108                                    void (*free_res)(void *));
 109
 110 static int              init(struct irs_nw *this);
 111
 112 /* Portability. */
 113
 114 #ifndef SEEK_SET
 115 # define SEEK_SET 0
 116 #endif
 117
 118 /* Public */
 119
 120 struct irs_nw *
 121 irs_lcl_nw(struct irs_acc *this) {
 122         struct irs_nw *nw;
 123         struct pvt *pvt;
 124
 125         UNUSED(this);
 126
 127         if (!(pvt = memget(sizeof *pvt))) {
 128                 errno = ENOMEM;
 129                 return (NULL);
 130         }
 131         memset(pvt, 0, sizeof *pvt);
 132         if (!(nw = memget(sizeof *nw))) {
 133                 memput(pvt, sizeof *pvt);
 134                 errno = ENOMEM;
 135                 return (NULL);
 136         }
 137         memset(nw, 0x5e, sizeof *nw);
 138         nw->private = pvt;
 139         nw->close = nw_close;
 140         nw->byname = nw_byname;
 141         nw->byaddr = nw_byaddr;
 142         nw->next = nw_next;
 143         nw->rewind = nw_rewind;
 144         nw->minimize = nw_minimize;
 145         nw->res_get = nw_res_get;
 146         nw->res_set = nw_res_set;
 147         return (nw);
 148 }
 149
 150 /* Methods */
 151
 152 static void
 153 nw_close(struct irs_nw *this) {
 154         struct pvt *pvt = (struct pvt *)this->private;
 155
 156         nw_minimize(this);
 157         if (pvt->res && pvt->free_res)
 158                 (*pvt->free_res)(pvt->res);
 159         if (pvt->fp)
 160                 (void)fclose(pvt->fp);
 161         memput(pvt, sizeof *pvt);
 162         memput(this, sizeof *this);
 163 }
 164
 165 static struct nwent *
 166 nw_byaddr(struct irs_nw *this, void *net, int length, int type) {
 167         struct nwent *p;
 168
 169         if (init(this) == -1)
 170                 return(NULL);
 171
 172         nw_rewind(this);
 173         while ((p = nw_next(this)) != NULL)
 174                 if (p->n_addrtype == type && p->n_length == length)
 175                         if (bitncmp(p->n_addr, net, length) == 0)
 176                                 break;
 177         return (p);
 178 }
 179
 180 static struct nwent *
 181 nw_byname(struct irs_nw *this, const char *name, int type) {
 182         struct nwent *p;
 183         char **ap;
 184
 185         if (init(this) == -1)
 186                 return(NULL);
 187
 188         nw_rewind(this);
 189         while ((p = nw_next(this)) != NULL) {
 190                 if (ns_samename(p->n_name, name) == 1 &&
 191                     p->n_addrtype == type)
 192                         break;
 193                 for (ap = p->n_aliases; *ap; ap++)
 194                         if ((ns_samename(*ap, name) == 1) &&
 195                             (p->n_addrtype == type))
 196                                 goto found;
 197         }
 198  found:
 199         return (p);
 200 }
 201
 202 static void
 203 nw_rewind(struct irs_nw *this) {
 204         struct pvt *pvt = (struct pvt *)this->private;
 205
 206         if (pvt->fp) {
 207                 if (fseek(pvt->fp, 0L, SEEK_SET) == 0)
 208                         return;
 209                 (void)fclose(pvt->fp);
 210         }
 211         if (!(pvt->fp = fopen(_PATH_NETWORKS, "r")))
 212                 return;
 213         if (fcntl(fileno(pvt->fp), F_SETFD, 1) < 0) {
 214                 (void)fclose(pvt->fp);
 215                 pvt->fp = NULL;
 216         }
 217 }
 218
 219 static struct nwent *
 220 nw_next(struct irs_nw *this) {
 221         struct pvt *pvt = (struct pvt *)this->private;
 222         struct nwent *ret = NULL;
 223         char *p, *cp, **q;
 224         char *bufp, *ndbuf, *dbuf = NULL;
 225         int c, bufsiz, offset = 0;
 226
 227         if (init(this) == -1)
 228                 return(NULL);
 229
 230         if (pvt->fp == NULL)
 231                 nw_rewind(this);
 232         if (pvt->fp == NULL) {
 233                 RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
 234                 return (NULL);
 235         }
 236         bufp = pvt->line;
 237         bufsiz = sizeof(pvt->line);
 238
 239  again:
 240         p = fgets(bufp + offset, bufsiz - offset, pvt->fp);
 241         if (p == NULL)
 242                 goto cleanup;
 243         if (!strchr(p, '\n') && !feof(pvt->fp)) {
 244 #define GROWBUF 1024
 245                 /* allocate space for longer line */
 246                 if (dbuf == NULL) {
 247                         if ((ndbuf = malloc(bufsiz + GROWBUF)) != NULL)
 248                                 strcpy(ndbuf, bufp);
 249                 } else
 250                         ndbuf = realloc(dbuf, bufsiz + GROWBUF);
 251                 if (ndbuf) {
 252                         dbuf = ndbuf;
 253                         bufp = dbuf;
 254                         bufsiz += GROWBUF;
 255                         offset = strlen(dbuf);
 256                 } else {
 257                         /* allocation failed; skip this long line */
 258                         while ((c = getc(pvt->fp)) != EOF)
 259                                 if (c == '\n')
 260                                         break;
 261                         if (c != EOF)
 262                                 ungetc(c, pvt->fp);
 263                 }
 264                 goto again;
 265         }
 266
 267         p -= offset;
 268         offset = 0;
 269
 270         if (*p == '#')
 271                 goto again;
 272
 273         cp = strpbrk(p, "#\n");
 274         if (cp != NULL)
 275                 *cp = '\0';
 276         pvt->net.n_name = p;
 277         cp = strpbrk(p, " \t");
 278         if (cp == NULL)
 279                 goto again;
 280         *cp++ = '\0';
 281         while (*cp == ' ' || *cp == '\t')
 282                 cp++;
 283         p = strpbrk(cp, " \t");
 284         if (p != NULL)
 285                 *p++ = '\0';
 286         pvt->net.n_length = inet_net_pton(AF_INET, cp, pvt->addr,
 287                                           sizeof pvt->addr);
 288         if (pvt->net.n_length < 0)
 289                 goto again;
 290         pvt->net.n_addrtype = AF_INET;
 291         pvt->net.n_addr = pvt->addr;
 292         q = pvt->net.n_aliases = pvt->aliases;
 293         if (p != NULL) {
 294                 cp = p;
 295                 while (cp && *cp) {
 296                         if (*cp == ' ' || *cp == '\t') {
 297                                 cp++;
 298                                 continue;
 299                         }
 300                         if (q < &pvt->aliases[MAXALIASES - 1])
 301                                 *q++ = cp;
 302                         cp = strpbrk(cp, " \t");
 303                         if (cp != NULL)
 304                                 *cp++ = '\0';
 305                 }
 306         }
 307         *q = NULL;
 308         ret = &pvt->net;
 309
 310  cleanup:
 311         if (dbuf)
 312                 free(dbuf);
 313
 314         return (ret);
 315 }
 316
 317 static void
 318 nw_minimize(struct irs_nw *this) {
 319         struct pvt *pvt = (struct pvt *)this->private;
 320
 321         if (pvt->res)
 322                 res_nclose(pvt->res);
 323         if (pvt->fp != NULL) {
 324                 (void)fclose(pvt->fp);
 325                 pvt->fp = NULL;
 326         }
 327 }
 328
 329 static struct __res_state *
 330 nw_res_get(struct irs_nw *this) {
 331         struct pvt *pvt = (struct pvt *)this->private;
 332
 333         if (!pvt->res) {
 334                 struct __res_state *res;
 335                 res = (struct __res_state *)malloc(sizeof *res);
 336                 if (!res) {
 337                         errno = ENOMEM;
 338                         return (NULL);
 339                 }
 340                 memset(res, 0, sizeof *res);
 341                 nw_res_set(this, res, free);
 342         }
 343
 344         return (pvt->res);
 345 }
 346
 347 static void
 348 nw_res_set(struct irs_nw *this, struct __res_state *res,
 349                 void (*free_res)(void *)) {
 350         struct pvt *pvt = (struct pvt *)this->private;
 351
 352         if (pvt->res && pvt->free_res) {
 353                 res_nclose(pvt->res);
 354                 (*pvt->free_res)(pvt->res);
 355         }
 356
 357         pvt->res = res;
 358         pvt->free_res = free_res;
 359 }
 360
 361 static int
 362 init(struct irs_nw *this) {
 363         struct pvt *pvt = (struct pvt *)this->private;
 364
 365         if (!pvt->res && !nw_res_get(this))
 366                 return (-1);
 367         if (((pvt->res->options & RES_INIT) == 0U) &&
 368             res_ninit(pvt->res) == -1)
 369                 return (-1);
 370         return (0);
 371 }