1 /* 2 * Copyright (c) 1999 - 2001 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * 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 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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 #ifdef HAVE_CONFIG_H 35 #include <config.h> 36 RCSID("$Id: getnameinfo.c,v 1.4 2001/07/09 15:14:19 assar Exp $"); 37 #endif 38 39 #include "roken.h" 40 41 static int 42 doit (int af, 43 const void *addr, 44 size_t addrlen, 45 int port, 46 char *host, size_t hostlen, 47 char *serv, size_t servlen, 48 int flags) 49 { 50 if (host != NULL) { 51 if (flags & NI_NUMERICHOST) { 52 if (inet_ntop (af, addr, host, hostlen) == NULL) 53 return EAI_SYSTEM; 54 } else { 55 struct hostent *he = gethostbyaddr (addr, 56 addrlen, 57 af); 58 if (he != NULL) { 59 strlcpy (host, hostent_find_fqdn(he), hostlen); 60 if (flags & NI_NOFQDN) { 61 char *dot = strchr (host, '.'); 62 if (dot != NULL) 63 *dot = '\0'; 64 } 65 } else if (flags & NI_NAMEREQD) { 66 return EAI_NONAME; 67 } else if (inet_ntop (af, addr, host, hostlen) == NULL) 68 return EAI_SYSTEM; 69 } 70 } 71 72 if (serv != NULL) { 73 if (flags & NI_NUMERICSERV) { 74 snprintf (serv, servlen, "%u", ntohs(port)); 75 } else { 76 const char *proto = "tcp"; 77 struct servent *se; 78 79 if (flags & NI_DGRAM) 80 proto = "udp"; 81 82 se = getservbyport (port, proto); 83 if (se == NULL) { 84 snprintf (serv, servlen, "%u", ntohs(port)); 85 } else { 86 strlcpy (serv, se->s_name, servlen); 87 } 88 } 89 } 90 return 0; 91 } 92 93 /* 94 * 95 */ 96 97 int 98 getnameinfo(const struct sockaddr *sa, socklen_t salen, 99 char *host, size_t hostlen, 100 char *serv, size_t servlen, 101 int flags) 102 { 103 switch (sa->sa_family) { 104 #ifdef HAVE_IPV6 105 case AF_INET6 : { 106 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa; 107 108 return doit (AF_INET6, &sin6->sin6_addr, sizeof(sin6->sin6_addr), 109 sin6->sin6_port, 110 host, hostlen, 111 serv, servlen, 112 flags); 113 } 114 #endif 115 case AF_INET : { 116 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa; 117 118 return doit (AF_INET, &sin->sin_addr, sizeof(sin->sin_addr), 119 sin->sin_port, 120 host, hostlen, 121 serv, servlen, 122 flags); 123 } 124 default : 125 return EAI_FAMILY; 126 } 127 } 128