1 /* $OpenBSD: getservbyport.c,v 1.7 2005/08/06 20:30:03 espie Exp $ */ 2 /* 3 * Copyright (c) 1983, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <netdb.h> 32 #include <stdio.h> 33 #include <string.h> 34 35 int 36 getservbyport_r(int port, const char *proto, struct servent *se, 37 struct servent_data *sd) 38 { 39 int error; 40 41 setservent_r(sd->stayopen, sd); 42 while ((error = getservent_r(se, sd)) == 0) { 43 if (se->s_port != port) 44 continue; 45 if (proto == 0 || strcmp(se->s_proto, proto) == 0) 46 break; 47 } 48 if (!sd->stayopen && sd->fp != NULL) { 49 fclose(sd->fp); 50 sd->fp = NULL; 51 } 52 return (error); 53 } 54 55 struct servent * 56 getservbyport(int port, const char *proto) 57 { 58 extern struct servent_data _servent_data; 59 static struct servent serv; 60 61 if (getservbyport_r(port, proto, &serv, &_servent_data) != 0) 62 return (NULL); 63 return (&serv); 64 } 65