| 1 | /*
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| 2 | * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
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| 3 | * (Royal Institute of Technology, Stockholm, Sweden).
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | *
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | *
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| 17 | * 3. Neither the name of the Institute nor the names of its contributors
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| 18 | * may be used to endorse or promote products derived from this software
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| 19 | * without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 31 | * SUCH DAMAGE.
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| 32 | */
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| 33 |
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| 34 | #include <config.h>
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| 35 |
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| 36 | #include "roken.h"
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| 37 |
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| 38 | static int
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| 39 | doit (int af,
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| 40 | const void *addr,
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| 41 | size_t addrlen,
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| 42 | int port,
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| 43 | char *host, size_t hostlen,
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| 44 | char *serv, size_t servlen,
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| 45 | int flags)
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| 46 | {
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| 47 | if (host != NULL) {
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| 48 | if (flags & NI_NUMERICHOST) {
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| 49 | if (inet_ntop (af, addr, host, hostlen) == NULL)
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| 50 | return EAI_SYSTEM;
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| 51 | } else {
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| 52 | struct hostent *he = gethostbyaddr (addr,
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| 53 | addrlen,
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| 54 | af);
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| 55 | if (he != NULL) {
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| 56 | strlcpy (host, hostent_find_fqdn(he), hostlen);
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| 57 | if (flags & NI_NOFQDN) {
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| 58 | char *dot = strchr (host, '.');
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| 59 | if (dot != NULL)
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| 60 | *dot = '\0';
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| 61 | }
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| 62 | } else if (flags & NI_NAMEREQD) {
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| 63 | return EAI_NONAME;
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| 64 | } else if (inet_ntop (af, addr, host, hostlen) == NULL)
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| 65 | return EAI_SYSTEM;
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| 66 | }
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| 67 | }
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| 68 |
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| 69 | if (serv != NULL) {
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| 70 | if (flags & NI_NUMERICSERV) {
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| 71 | snprintf (serv, servlen, "%u", ntohs(port));
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| 72 | } else {
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| 73 | const char *proto = "tcp";
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| 74 | struct servent *se;
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| 75 |
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| 76 | if (flags & NI_DGRAM)
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| 77 | proto = "udp";
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| 78 |
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| 79 | se = getservbyport (port, proto);
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| 80 | if (se == NULL) {
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| 81 | snprintf (serv, servlen, "%u", ntohs(port));
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| 82 | } else {
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| 83 | strlcpy (serv, se->s_name, servlen);
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| 84 | }
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| 85 | }
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| 86 | }
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| 87 | return 0;
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| 88 | }
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| 89 |
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| 90 | /*
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| 91 | *
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| 92 | */
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| 93 |
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| 94 | ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
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| 95 | getnameinfo(const struct sockaddr *sa, socklen_t salen,
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| 96 | char *host, size_t hostlen,
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| 97 | char *serv, size_t servlen,
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| 98 | int flags)
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| 99 | {
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| 100 | switch (sa->sa_family) {
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| 101 | #ifdef HAVE_IPV6
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| 102 | case AF_INET6 : {
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| 103 | const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
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| 104 |
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| 105 | return doit (AF_INET6, &sin6->sin6_addr, sizeof(sin6->sin6_addr),
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| 106 | sin6->sin6_port,
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| 107 | host, hostlen,
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| 108 | serv, servlen,
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| 109 | flags);
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| 110 | }
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| 111 | #endif
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| 112 | case AF_INET : {
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| 113 | const struct sockaddr_in *sin4 = (const struct sockaddr_in *)sa;
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| 114 |
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| 115 | return doit (AF_INET, &sin4->sin_addr, sizeof(sin4->sin_addr),
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| 116 | sin4->sin_port,
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| 117 | host, hostlen,
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| 118 | serv, servlen,
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| 119 | flags);
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| 120 | }
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| 121 | default :
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| 122 | return EAI_FAMILY;
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| 123 | }
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| 124 | }
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