contrib/bind-9.2.4rc7/lib/bind/irs/lcl_pr.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_pr.c,v 1.1.2.1 2004/03/09 09:17:33 marka Exp $";
  53 #endif /* LIBC_SCCS and not lint */
  54
  55 /* extern */
  56
  57 #include "port_before.h"
  58
  59 #include <sys/types.h>
  60 #include <netinet/in.h>
  61 #include <arpa/nameser.h>
  62 #include <resolv.h>
  63
  64 #include <errno.h>
  65 #include <fcntl.h>
  66 #include <string.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69
  70 #include <irs.h>
  71 #include <isc/memcluster.h>
  72
  73 #include "port_after.h"
  74
  75 #include "irs_p.h"
  76 #include "lcl_p.h"
  77
  78 #ifndef _PATH_PROTOCOLS
  79 #define _PATH_PROTOCOLS "/etc/protocols"
  80 #endif
  81 #define MAXALIASES      35
  82
  83 /* Types */
  84
  85 struct pvt {
  86         FILE *          fp;
  87         char            line[BUFSIZ+1];
  88         struct protoent proto;
  89         char *          proto_aliases[MAXALIASES];
  90 };
  91
  92 /* Forward */
  93
  94 static void                     pr_close(struct irs_pr *);
  95 static struct protoent *        pr_next(struct irs_pr *);
  96 static struct protoent *        pr_byname(struct irs_pr *, const char *);
  97 static struct protoent *        pr_bynumber(struct irs_pr *, int);
  98 static void                     pr_rewind(struct irs_pr *);
  99 static void                     pr_minimize(struct irs_pr *);
 100
 101 /* Portability. */
 102
 103 #ifndef SEEK_SET
 104 # define SEEK_SET 0
 105 #endif
 106
 107 /* Public */
 108
 109 struct irs_pr *
 110 irs_lcl_pr(struct irs_acc *this) {
 111         struct irs_pr *pr;
 112         struct pvt *pvt;
 113
 114         if (!(pr = memget(sizeof *pr))) {
 115                 errno = ENOMEM;
 116                 return (NULL);
 117         }
 118         if (!(pvt = memget(sizeof *pvt))) {
 119                 memput(pr, sizeof *this);
 120                 errno = ENOMEM;
 121                 return (NULL);
 122         }
 123         memset(pvt, 0, sizeof *pvt);
 124         pr->private = pvt;
 125         pr->close = pr_close;
 126         pr->byname = pr_byname;
 127         pr->bynumber = pr_bynumber;
 128         pr->next = pr_next;
 129         pr->rewind = pr_rewind;
 130         pr->minimize = pr_minimize;
 131         pr->res_get = NULL;
 132         pr->res_set = NULL;
 133         return (pr);
 134 }
 135
 136 /* Methods */
 137
 138 static void
 139 pr_close(struct irs_pr *this) {
 140         struct pvt *pvt = (struct pvt *)this->private;
 141
 142         if (pvt->fp)
 143                 (void) fclose(pvt->fp);
 144         memput(pvt, sizeof *pvt);
 145         memput(this, sizeof *this);
 146 }
 147
 148 static struct protoent *
 149 pr_byname(struct irs_pr *this, const char *name) {
 150
 151         struct protoent *p;
 152         char **cp;
 153
 154         pr_rewind(this);
 155         while ((p = pr_next(this))) {
 156                 if (!strcmp(p->p_name, name))
 157                         goto found;
 158                 for (cp = p->p_aliases; *cp; cp++)
 159                         if (!strcmp(*cp, name))
 160                                 goto found;
 161         }
 162  found:
 163         return (p);
 164 }
 165
 166 static struct protoent *
 167 pr_bynumber(struct irs_pr *this, int proto) {
 168         struct protoent *p;
 169
 170         pr_rewind(this);
 171         while ((p = pr_next(this)))
 172                 if (p->p_proto == proto)
 173                         break;
 174         return (p);
 175 }
 176
 177 static void
 178 pr_rewind(struct irs_pr *this) {
 179         struct pvt *pvt = (struct pvt *)this->private;
 180
 181         if (pvt->fp) {
 182                 if (fseek(pvt->fp, 0L, SEEK_SET) == 0)
 183                         return;
 184                 (void)fclose(pvt->fp);
 185         }
 186         if (!(pvt->fp = fopen(_PATH_PROTOCOLS, "r" )))
 187                 return;
 188         if (fcntl(fileno(pvt->fp), F_SETFD, 1) < 0) {
 189                 (void)fclose(pvt->fp);
 190                 pvt->fp = NULL;
 191         }
 192 }
 193
 194 static struct protoent *
 195 pr_next(struct irs_pr *this) {
 196         struct pvt *pvt = (struct pvt *)this->private;
 197         char *p, *cp, **q;
 198         char *bufp, *ndbuf, *dbuf = NULL;
 199         int c, bufsiz, offset;
 200
 201         if (!pvt->fp)
 202                 pr_rewind(this);
 203         if (!pvt->fp)
 204                 return (NULL);
 205         bufp = pvt->line;
 206         bufsiz = BUFSIZ;
 207         offset = 0;
 208  again:
 209         if ((p = fgets(bufp + offset, bufsiz - offset, pvt->fp)) == NULL) {
 210                 if (dbuf)
 211                         free(dbuf);
 212                 return (NULL);
 213         }
 214         if (!strchr(p, '\n') && !feof(pvt->fp)) {
 215 #define GROWBUF 1024
 216                 /* allocate space for longer line */
 217                 if (dbuf == NULL) {
 218                         if ((ndbuf = malloc(bufsiz + GROWBUF)) != NULL)
 219                                 strcpy(ndbuf, bufp);
 220                 } else
 221                         ndbuf = realloc(dbuf, bufsiz + GROWBUF);
 222                 if (ndbuf) {
 223                         dbuf = ndbuf;
 224                         bufp = dbuf;
 225                         bufsiz += GROWBUF;
 226                         offset = strlen(dbuf);
 227                 } else {
 228                         /* allocation failed; skip this long line */
 229                         while ((c = getc(pvt->fp)) != EOF)
 230                                 if (c == '\n')
 231                                         break;
 232                         if (c != EOF)
 233                                 ungetc(c, pvt->fp);
 234                 }
 235                 goto again;
 236         }
 237
 238         p -= offset;
 239         offset = 0;
 240
 241         if (*p == '#')
 242                 goto again;
 243         cp = strpbrk(p, "#\n");
 244         if (cp != NULL)
 245                 *cp = '\0';
 246         pvt->proto.p_name = p;
 247         cp = strpbrk(p, " \t");
 248         if (cp == NULL)
 249                 goto again;
 250         *cp++ = '\0';
 251         while (*cp == ' ' || *cp == '\t')
 252                 cp++;
 253         p = strpbrk(cp, " \t");
 254         if (p != NULL)
 255                 *p++ = '\0';
 256         pvt->proto.p_proto = atoi(cp);
 257         q = pvt->proto.p_aliases = pvt->proto_aliases;
 258         if (p != NULL) {
 259                 cp = p;
 260                 while (cp && *cp) {
 261                         if (*cp == ' ' || *cp == '\t') {
 262                                 cp++;
 263                                 continue;
 264                         }
 265                         if (q < &pvt->proto_aliases[MAXALIASES - 1])
 266                                 *q++ = cp;
 267                         cp = strpbrk(cp, " \t");
 268                         if (cp != NULL)
 269                                 *cp++ = '\0';
 270                 }
 271         }
 272         *q = NULL;
 273         return (&pvt->proto);
 274 }
 275
 276 static void
 277 pr_minimize(struct irs_pr *this) {
 278         struct pvt *pvt = (struct pvt *)this->private;
 279
 280         if (pvt->fp != NULL) {
 281                 (void)fclose(pvt->fp);
 282                 pvt->fp = NULL;
 283         }
 284 }