inet/getservent.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[] = "@(#)getservent.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 <string.h>
  43 #include <stdlib.h>
  44
  45 #define MAXALIASES      35
  46
  47 static FILE *servf = NULL;
  48 static char line[BUFSIZ+1];
  49 static struct servent serv;
  50 static char *serv_aliases[MAXALIASES];
  51 int _serv_stayopen;
  52
  53 void
  54 setservent(f)
  55         int f;
  56 {
  57         if (servf == NULL)
  58                 servf = fopen(_PATH_SERVICES, "r" );
  59         else
  60                 rewind(servf);
  61         _serv_stayopen |= f;
  62 }
  63
  64 void
  65 endservent()
  66 {
  67         if (servf) {
  68                 fclose(servf);
  69                 servf = NULL;
  70         }
  71         _serv_stayopen = 0;
  72 }
  73
  74 struct servent *
  75 getservent()
  76 {
  77         char *p;
  78         register char *cp, **q;
  79
  80         if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL)
  81                 return (NULL);
  82 again:
  83         if ((p = fgets(line, BUFSIZ, servf)) == 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         serv.s_name = p;
  92         p = strpbrk(p, " \t");
  93         if (p == NULL)
  94                 goto again;
  95         *p++ = '\0';
  96         while (*p == ' ' || *p == '\t')
  97                 p++;
  98         cp = strpbrk(p, ",/");
  99         if (cp == NULL)
 100                 goto again;
 101         *cp++ = '\0';
 102         serv.s_port = htons((u_short)atoi(p));
 103         serv.s_proto = cp;
 104         q = serv.s_aliases = serv_aliases;
 105         cp = strpbrk(cp, " \t");
 106         if (cp != NULL)
 107                 *cp++ = '\0';
 108         while (cp && *cp) {
 109                 if (*cp == ' ' || *cp == '\t') {
 110                         cp++;
 111                         continue;
 112                 }
 113                 if (q < &serv_aliases[MAXALIASES - 1])
 114                         *q++ = cp;
 115                 cp = strpbrk(cp, " \t");
 116                 if (cp != NULL)
 117                         *cp++ = '\0';
 118         }
 119         *q = NULL;
 120         return (&serv);
 121 }