inet/getprtent.c

   1 /*
   2  * Copyright (c) 1983, 1993
   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 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)getprotoent.c       8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 #include <sys/types.h>
  39 #include <sys/socket.h>
  40 #include <netdb.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44
  45 #define MAXALIASES      35
  46
  47 static FILE *protof = NULL;
  48 static char line[BUFSIZ+1];
  49 static struct protoent proto;
  50 static char *proto_aliases[MAXALIASES];
  51 int _proto_stayopen;
  52
  53 void
  54 setprotoent(f)
  55         int f;
  56 {
  57         if (protof == NULL)
  58                 protof = fopen(_PATH_PROTOCOLS, "r" );
  59         else
  60                 rewind(protof);
  61         _proto_stayopen |= f;
  62 }
  63
  64 void
  65 endprotoent()
  66 {
  67         if (protof) {
  68                 fclose(protof);
  69                 protof = NULL;
  70         }
  71         _proto_stayopen = 0;
  72 }
  73
  74 struct protoent *
  75 getprotoent()
  76 {
  77         char *p;
  78         register char *cp, **q;
  79
  80         if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
  81                 return (NULL);
  82 again:
  83         if ((p = fgets(line, BUFSIZ, protof)) == NULL)
  84                 return (NULL);
  85         if (*p == '#')
  86                 goto again;
  87         cp = strpbrk(p, "#\n");
  88         if (cp == NULL)
  89                 goto again;
  90         *cp = '\0';
  91         proto.p_name = p;
  92         cp = strpbrk(p, " \t");
  93         if (cp == NULL)
  94                 goto again;
  95         *cp++ = '\0';
  96         while (*cp == ' ' || *cp == '\t')
  97                 cp++;
  98         p = strpbrk(cp, " \t");
  99         if (p != NULL)
 100                 *p++ = '\0';
 101         proto.p_proto = atoi(cp);
 102         q = proto.p_aliases = proto_aliases;
 103         if (p != NULL) {
 104                 cp = p;
 105                 while (cp && *cp) {
 106                         if (*cp == ' ' || *cp == '\t') {
 107                                 cp++;
 108                                 continue;
 109                         }
 110                         if (q < &proto_aliases[MAXALIASES - 1])
 111                                 *q++ = cp;
 112                         cp = strpbrk(cp, " \t");
 113                         if (cp != NULL)
 114                                 *cp++ = '\0';
 115                 }
 116         }
 117         *q = NULL;
 118         return (&proto);
 119 }