src/kits/network/netresolv/irs/getprotoent_r.c

   1 /*      $NetBSD: getprotoent_r.c,v 1.6 2011/10/15 23:00:02 christos Exp $       */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)getprotoent.c       8.1 (Berkeley) 6/4/93";
  36 #else
  37 __RCSID("$NetBSD: getprotoent_r.c,v 1.6 2011/10/15 23:00:02 christos Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include <netdb.h>
  42 #include <stdio.h>
  43 #include <errno.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46
  47 #include <FindDirectory.h>
  48
  49 #include <libutil.h>
  50 #include "protoent.h"
  51
  52 #ifdef __weak_alias
  53 __weak_alias(endprotoent_r,_endprotoent_r)
  54 __weak_alias(getprotoent_r,_getprotoent_r)
  55 __weak_alias(setprotoent_r,_setprotoent_r)
  56 #endif
  57
  58 void
  59 setprotoent_r(int f, struct protoent_data *pd)
  60 {
  61         if (pd->fp == NULL) {
  62                 char buffer[256];
  63                 find_directory(B_SYSTEM_DATA_DIRECTORY, 0, false, buffer, sizeof(buffer));
  64                 strlcat(buffer, "/network/protocols", sizeof(buffer));
  65
  66                 pd->fp = fopen(buffer, "re");
  67         } else
  68                 rewind(pd->fp);
  69         pd->stayopen |= f;
  70 }
  71
  72 void
  73 endprotoent_r(struct protoent_data *pd)
  74 {
  75         if (pd->fp) {
  76                 (void)fclose(pd->fp);
  77                 pd->fp = NULL;
  78         }
  79         if (pd->aliases) {
  80                 free(pd->aliases);
  81                 pd->aliases = NULL;
  82                 pd->maxaliases = 0;
  83         }
  84         if (pd->line) {
  85                 free(pd->line);
  86                 pd->line = NULL;
  87         }
  88         pd->stayopen = 0;
  89 }
  90
  91 struct protoent *
  92 getprotoent_r(struct protoent *pr, struct protoent_data *pd)
  93 {
  94         char *p, *cp, **q;
  95         size_t i = 0;
  96         int oerrno;
  97
  98         if (pd->fp == NULL)
  99                 setprotoent_r(0, pd);
 100         if (pd->fp == NULL)
 101                 return NULL;
 102
 103         for (;;) {
 104                 if (pd->line)
 105                         free(pd->line);
 106                 pd->line = fparseln(pd->fp, NULL, NULL, NULL,
 107                     FPARSELN_UNESCALL);
 108                 if (pd->line == NULL)
 109                         return NULL;
 110                 pr->p_name = p = pd->line;
 111                 cp = strpbrk(p, " \t");
 112                 if (cp == NULL)
 113                         continue;
 114                 *cp++ = '\0';
 115                 while (*cp == ' ' || *cp == '\t')
 116                         cp++;
 117                 p = strpbrk(cp, " \t");
 118                 if (p != NULL)
 119                         *p++ = '\0';
 120                 pr->p_proto = atoi(cp);
 121                 if (pd->aliases == NULL) {
 122                         pd->maxaliases = 10;
 123                         pd->aliases = malloc(pd->maxaliases * sizeof(char *));
 124                         if (pd->aliases == NULL) {
 125                                 oerrno = errno;
 126                                 endprotoent_r(pd);
 127                                 errno = oerrno;
 128                                 return NULL;
 129                         }
 130                 }
 131                 q = pr->p_aliases = pd->aliases;
 132                 if (p != NULL) {
 133                         cp = p;
 134                         while (cp && *cp) {
 135                                 if (*cp == ' ' || *cp == '\t') {
 136                                         cp++;
 137                                         continue;
 138                                 }
 139                                 if (i == pd->maxaliases - 2) {
 140                                         pd->maxaliases *= 2;
 141                                         q = realloc(q,
 142                                             pd->maxaliases * sizeof(char *));
 143                                         if (q == NULL) {
 144                                                 oerrno = errno;
 145                                                 endprotoent_r(pd);
 146                                                 errno = oerrno;
 147                                                 return NULL;
 148                                         }
 149                                         pr->p_aliases = pd->aliases = q;
 150                                 }
 151                                 q[i++] = cp;
 152
 153                                 cp = strpbrk(cp, " \t");
 154                                 if (cp != NULL)
 155                                         *cp++ = '\0';
 156                         }
 157                 }
 158                 q[i] = NULL;
 159                 return pr;
 160         }
 161 }