1 /* $NetBSD: getservbyport_r.c,v 1.5 2006/07/28 15:14:45 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[] = "@(#)getservbyport.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: getservbyport_r.c,v 1.5 2006/07/28 15:14:45 christos Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <stdio.h> 43 #include <netdb.h> 44 #include <string.h> 45 #include <stdlib.h> 46 #include <db.h> 47 48 #include "servent.h" 49 50 #ifdef __weak_alias 51 __weak_alias(getservbyport_r,_getservbyport_r) 52 #endif 53 54 static struct servent * 55 _servent_getbyport(struct servent_data *sd, struct servent *sp, int port, 56 const char *proto) 57 { 58 if (sd->flags & _SV_DB) { 59 char buf[BUFSIZ]; 60 DBT key, data; 61 DB *db = sd->db; 62 key.data = buf; 63 64 port = htons(port); 65 if (proto == NULL) 66 key.size = snprintf(buf, sizeof(buf), "\377%d", port); 67 else 68 key.size = snprintf(buf, sizeof(buf), "\377%d/%s", port, 69 proto); 70 key.size++; 71 72 if ((*db->get)(db, &key, &data, 0) != 0) 73 return NULL; 74 75 if ((*db->get)(db, &data, &key, 0) != 0) 76 return NULL; 77 78 if (sd->line) 79 free(sd->line); 80 81 sd->line = strdup(key.data); 82 return _servent_parseline(sd, sp); 83 } else { 84 while (_servent_getline(sd) != -1) { 85 if (_servent_parseline(sd, sp) == NULL) 86 continue; 87 if (sp->s_port != port) 88 continue; 89 if (proto == NULL || strcmp(sp->s_proto, proto) == 0) 90 return sp; 91 } 92 return NULL; 93 } 94 } 95 96 struct servent * 97 getservbyport_r(int port, const char *proto, struct servent *sp, 98 struct servent_data *sd) 99 { 100 setservent_r(sd->flags & _SV_STAYOPEN, sd); 101 sp = _servent_getbyport(sd, sp, port, proto); 102 if (!(sd->flags & _SV_STAYOPEN)) 103 _servent_close(sd); 104 return sp; 105 } 106