1 /* 2 * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan 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 #include <config.h> 35 36 #include "roken.h" 37 38 static int 39 doit (int af, 40 const void *addr, 41 size_t addrlen, 42 int port, 43 char *host, size_t hostlen, 44 char *serv, size_t servlen, 45 int flags) 46 { 47 if (host != NULL) { 48 if (flags & NI_NUMERICHOST) { 49 if (inet_ntop (af, addr, host, hostlen) == NULL) 50 return EAI_SYSTEM; 51 } else { 52 struct hostent *he = gethostbyaddr (addr, 53 addrlen, 54 af); 55 if (he != NULL) { 56 strlcpy (host, hostent_find_fqdn(he), hostlen); 57 if (flags & NI_NOFQDN) { 58 char *dot = strchr (host, '.'); 59 if (dot != NULL) 60 *dot = '\0'; 61 } 62 } else if (flags & NI_NAMEREQD) { 63 return EAI_NONAME; 64 } else if (inet_ntop (af, addr, host, hostlen) == NULL) 65 return EAI_SYSTEM; 66 } 67 } 68 69 if (serv != NULL) { 70 if (flags & NI_NUMERICSERV) { 71 snprintf (serv, servlen, "%u", ntohs(port)); 72 } else { 73 const char *proto = "tcp"; 74 struct servent *se; 75 76 if (flags & NI_DGRAM) 77 proto = "udp"; 78 79 se = getservbyport (port, proto); 80 if (se == NULL) { 81 snprintf (serv, servlen, "%u", ntohs(port)); 82 } else { 83 strlcpy (serv, se->s_name, servlen); 84 } 85 } 86 } 87 return 0; 88 } 89 90 /* 91 * 92 */ 93 94 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL 95 getnameinfo(const struct sockaddr *sa, socklen_t salen, 96 char *host, size_t hostlen, 97 char *serv, size_t servlen, 98 int flags) 99 { 100 switch (sa->sa_family) { 101 #ifdef HAVE_IPV6 102 case AF_INET6 : { 103 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa; 104 105 return doit (AF_INET6, &sin6->sin6_addr, sizeof(sin6->sin6_addr), 106 sin6->sin6_port, 107 host, hostlen, 108 serv, servlen, 109 flags); 110 } 111 #endif 112 case AF_INET : { 113 const struct sockaddr_in *sin4 = (const struct sockaddr_in *)sa; 114 115 return doit (AF_INET, &sin4->sin_addr, sizeof(sin4->sin_addr), 116 sin4->sin_port, 117 host, hostlen, 118 serv, servlen, 119 flags); 120 } 121 default : 122 return EAI_FAMILY; 123 } 124 } 125