1 /* $NetBSD: getservbyport_r.c,v 1.7 2010/04/25 00:54:46 joerg 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 1.7 2010/04/25 00:54:46 joerg Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <cdbr.h> 43 #include <netdb.h> 44 #include <string.h> 45 #include <stdlib.h> 46 47 #include "servent.h" 48 49 #ifdef __weak_alias 50 __weak_alias(getservbyport_r,_getservbyport_r) 51 #endif 52 53 static struct servent * 54 _servent_getbyport(struct servent_data *sd, struct servent *sp, int port, 55 const char *proto) 56 { 57 58 if ((sd->flags & (_SV_CDB | _SV_PLAINFILE)) == 0) 59 return NULL; 60 61 if (sd->flags & _SV_CDB) { 62 uint8_t buf[255 + 4]; 63 size_t protolen; 64 const uint8_t *data; 65 const void *data_ptr; 66 size_t datalen; 67 68 port = be16toh(port); 69 70 if (proto != NULL && *proto == '\0') 71 return NULL; 72 if (proto != NULL) 73 protolen = strlen(proto); 74 else 75 protolen = 0; 76 if (port < 0 || port > 65536) 77 return NULL; 78 79 buf[0] = 0; 80 buf[1] = protolen; 81 be16enc(buf + 2, port); 82 memcpy(buf + 4, proto, protolen); 83 84 if (cdbr_find(sd->cdb, buf, 4 + protolen, 85 &data_ptr, &datalen)) 86 return NULL; 87 88 if (datalen < protolen + 4) 89 return NULL; 90 91 data = data_ptr; 92 if (be16dec(data) != port) 93 return NULL; 94 if (protolen) { 95 if (data[2] != protolen) 96 return NULL; 97 if (memcmp(data + 3, proto, protolen + 1)) 98 return NULL; 99 } 100 return _servent_parsedb(sd, sp, data, datalen); 101 } else { 102 while (_servent_getline(sd) != -1) { 103 if (_servent_parseline(sd, sp) == NULL) 104 continue; 105 if (sp->s_port != port) 106 continue; 107 if (proto == NULL || strcmp(sp->s_proto, proto) == 0) 108 return sp; 109 } 110 return NULL; 111 } 112 } 113 114 struct servent * 115 getservbyport_r(int port, const char *proto, struct servent *sp, 116 struct servent_data *sd) 117 { 118 setservent_r(sd->flags & _SV_STAYOPEN, sd); 119 sp = _servent_getbyport(sd, sp, port, proto); 120 if (!(sd->flags & _SV_STAYOPEN)) 121 _servent_close(sd); 122 return sp; 123 } 124