| 1 | /*
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| 2 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. Neither the name of the project nor the names of its contributors
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| 14 | * may be used to endorse or promote products derived from this software
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| 15 | * without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 27 | * SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | /*
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| 31 | * Issues to be discussed:
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| 32 | * - Thread safe-ness must be checked
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| 33 | * - Return values. There seems to be no standard for return value (RFC2133)
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| 34 | * but INRIA implementation returns EAI_xxx defined for getaddrinfo().
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| 35 | */
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| 36 |
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| 37 | #if 0
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| 38 | #include <sys/types.h>
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| 39 | #include <sys/socket.h>
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| 40 | #include <netinet/in.h>
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| 41 | #include <arpa/inet.h>
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| 42 | #include <arpa/nameser.h>
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| 43 | #include <netdb.h>
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| 44 | #include <resolv.h>
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| 45 | #include <string.h>
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| 46 | #include <stddef.h>
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| 47 |
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| 48 | #include "addrinfo.h"
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| 49 | #endif
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| 50 |
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| 51 | #define SUCCESS 0
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| 52 | #define YES 1
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| 53 | #define NO 0
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| 54 |
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| 55 | static struct gni_afd {
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| 56 | int a_af;
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| 57 | int a_addrlen;
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| 58 | int a_socklen;
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| 59 | int a_off;
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| 60 | } gni_afdl [] = {
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| 61 | #ifdef ENABLE_IPV6
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| 62 | {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
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| 63 | offsetof(struct sockaddr_in6, sin6_addr)},
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| 64 | #endif
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| 65 | {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
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| 66 | offsetof(struct sockaddr_in, sin_addr)},
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| 67 | {0, 0, 0},
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| 68 | };
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| 69 |
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| 70 | struct gni_sockinet {
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| 71 | u_char si_len;
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| 72 | u_char si_family;
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| 73 | u_short si_port;
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| 74 | };
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| 75 |
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| 76 | #define ENI_NOSOCKET 0
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| 77 | #define ENI_NOSERVNAME 1
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| 78 | #define ENI_NOHOSTNAME 2
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| 79 | #define ENI_MEMORY 3
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| 80 | #define ENI_SYSTEM 4
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| 81 | #define ENI_FAMILY 5
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| 82 | #define ENI_SALEN 6
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| 83 |
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| 84 | /* forward declaration to make gcc happy */
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| 85 | int getnameinfo Py_PROTO((const struct sockaddr *, size_t, char *, size_t,
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| 86 | char *, size_t, int));
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| 87 |
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| 88 | int
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| 89 | getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
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| 90 | const struct sockaddr *sa;
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| 91 | size_t salen;
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| 92 | char *host;
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| 93 | size_t hostlen;
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| 94 | char *serv;
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| 95 | size_t servlen;
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| 96 | int flags;
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| 97 | {
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| 98 | struct gni_afd *gni_afd;
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| 99 | struct servent *sp;
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| 100 | struct hostent *hp;
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| 101 | u_short port;
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| 102 | int family, len, i;
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| 103 | char *addr, *p;
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| 104 | u_long v4a;
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| 105 | #ifdef ENABLE_IPV6
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| 106 | u_char pfx;
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| 107 | #endif
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| 108 | int h_error;
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| 109 | char numserv[512];
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| 110 | char numaddr[512];
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| 111 |
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| 112 | if (sa == NULL)
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| 113 | return ENI_NOSOCKET;
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| 114 |
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| 115 | #ifdef HAVE_SOCKADDR_SA_LEN
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| 116 | len = sa->sa_len;
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| 117 | if (len != salen) return ENI_SALEN;
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| 118 | #else
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| 119 | len = salen;
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| 120 | #endif
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| 121 |
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| 122 | family = sa->sa_family;
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| 123 | for (i = 0; gni_afdl[i].a_af; i++)
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| 124 | if (gni_afdl[i].a_af == family) {
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| 125 | gni_afd = &gni_afdl[i];
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| 126 | goto found;
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| 127 | }
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| 128 | return ENI_FAMILY;
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| 129 |
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| 130 | found:
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| 131 | if (len != gni_afd->a_socklen) return ENI_SALEN;
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| 132 |
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| 133 | port = ((struct gni_sockinet *)sa)->si_port; /* network byte order */
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| 134 | addr = (char *)sa + gni_afd->a_off;
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| 135 |
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| 136 | if (serv == NULL || servlen == 0) {
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| 137 | /* what we should do? */
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| 138 | } else if (flags & NI_NUMERICSERV) {
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| 139 | sprintf(numserv, "%d", ntohs(port));
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| 140 | if (strlen(numserv) > servlen)
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| 141 | return ENI_MEMORY;
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| 142 | strcpy(serv, numserv);
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| 143 | } else {
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| 144 | sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp");
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| 145 | if (sp) {
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| 146 | if (strlen(sp->s_name) > servlen)
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| 147 | return ENI_MEMORY;
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| 148 | strcpy(serv, sp->s_name);
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| 149 | } else
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| 150 | return ENI_NOSERVNAME;
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| 151 | }
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| 152 |
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| 153 | switch (sa->sa_family) {
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| 154 | case AF_INET:
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| 155 | v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
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| 156 | if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
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| 157 | flags |= NI_NUMERICHOST;
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| 158 | v4a >>= IN_CLASSA_NSHIFT;
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| 159 | if (v4a == 0 || v4a == IN_LOOPBACKNET)
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| 160 | flags |= NI_NUMERICHOST;
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| 161 | break;
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| 162 | #ifdef ENABLE_IPV6
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| 163 | case AF_INET6:
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| 164 | pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[0];
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| 165 | if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
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| 166 | flags |= NI_NUMERICHOST;
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| 167 | break;
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| 168 | #endif
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| 169 | }
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| 170 | if (host == NULL || hostlen == 0) {
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| 171 | /* what should we do? */
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| 172 | } else if (flags & NI_NUMERICHOST) {
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| 173 | if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))
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| 174 | == NULL)
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| 175 | return ENI_SYSTEM;
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| 176 | if (strlen(numaddr) > hostlen)
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| 177 | return ENI_MEMORY;
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| 178 | strcpy(host, numaddr);
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| 179 | } else {
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| 180 | #ifdef ENABLE_IPV6
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| 181 | hp = getipnodebyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af, &h_error);
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| 182 | #else
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| 183 | hp = gethostbyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af);
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| 184 | h_error = h_errno;
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| 185 | #endif
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| 186 |
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| 187 | if (hp) {
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| 188 | if (flags & NI_NOFQDN) {
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| 189 | p = strchr(hp->h_name, '.');
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| 190 | if (p) *p = '\0';
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| 191 | }
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| 192 | if (strlen(hp->h_name) > hostlen) {
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| 193 | #ifdef ENABLE_IPV6
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| 194 | freehostent(hp);
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| 195 | #endif
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| 196 | return ENI_MEMORY;
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| 197 | }
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| 198 | strcpy(host, hp->h_name);
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| 199 | #ifdef ENABLE_IPV6
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| 200 | freehostent(hp);
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| 201 | #endif
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| 202 | } else {
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| 203 | if (flags & NI_NAMEREQD)
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| 204 | return ENI_NOHOSTNAME;
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| 205 | if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))
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| 206 | == NULL)
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| 207 | return ENI_NOHOSTNAME;
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| 208 | if (strlen(numaddr) > hostlen)
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| 209 | return ENI_MEMORY;
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| 210 | strcpy(host, numaddr);
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| 211 | }
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| 212 | }
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| 213 | return SUCCESS;
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| 214 | }
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