823d2a5d81
draft-ietf-ipngwg-scopedaddr-format-00.txt (will be 01), use "address%interface" notation for extended scoped IPv6 address. NOTE: the change affects link-local addresses only. I hope it to be the final change on it.....
318 lines
8.1 KiB
C
318 lines
8.1 KiB
C
/* $NetBSD: getnameinfo.c,v 1.12 2000/02/17 17:06:17 itojun Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Issues to be discussed:
|
|
* - Thread safe-ness must be checked
|
|
* - Return values. There seems to be no standard for return value (RFC2553)
|
|
* but INRIA implementation returns EAI_xxx defined for getaddrinfo().
|
|
* - RFC2553 says that we should raise error on short buffer. X/Open says
|
|
* we need to truncate the result. We obey RFC2553 (and X/Open should be
|
|
* modified).
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <net/if.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <arpa/nameser.h>
|
|
#include <netdb.h>
|
|
#include <resolv.h>
|
|
#include <string.h>
|
|
#include <stddef.h>
|
|
|
|
#define SUCCESS 0
|
|
#define ANY 0
|
|
#define YES 1
|
|
#define NO 0
|
|
|
|
static struct afd {
|
|
int a_af;
|
|
int a_addrlen;
|
|
int a_socklen;
|
|
int a_off;
|
|
} afdl [] = {
|
|
#ifdef INET6
|
|
{PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
|
|
offsetof(struct sockaddr_in6, sin6_addr)},
|
|
#endif
|
|
{PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
|
|
offsetof(struct sockaddr_in, sin_addr)},
|
|
{0, 0, 0},
|
|
};
|
|
|
|
struct sockinet {
|
|
u_char si_len;
|
|
u_char si_family;
|
|
u_short si_port;
|
|
};
|
|
|
|
#ifdef INET6
|
|
static char *ip6_sa2str __P((struct sockaddr_in6 *, char *, int));
|
|
#endif
|
|
|
|
#define ENI_NOSOCKET 0
|
|
#define ENI_NOSERVNAME 1
|
|
#define ENI_NOHOSTNAME 2
|
|
#define ENI_MEMORY 3
|
|
#define ENI_SYSTEM 4
|
|
#define ENI_FAMILY 5
|
|
#define ENI_SALEN 6
|
|
|
|
int
|
|
getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
|
|
const struct sockaddr *sa;
|
|
size_t salen;
|
|
char *host;
|
|
size_t hostlen;
|
|
char *serv;
|
|
size_t servlen;
|
|
int flags;
|
|
{
|
|
struct afd *afd;
|
|
struct servent *sp;
|
|
struct hostent *hp;
|
|
u_short port;
|
|
int family, i;
|
|
char *addr, *p;
|
|
u_int32_t v4a;
|
|
int h_error;
|
|
char numserv[512];
|
|
char numaddr[512];
|
|
|
|
if (sa == NULL)
|
|
return ENI_NOSOCKET;
|
|
|
|
if (sa->sa_len != salen)
|
|
return ENI_SALEN;
|
|
|
|
family = sa->sa_family;
|
|
for (i = 0; afdl[i].a_af; i++)
|
|
if (afdl[i].a_af == family) {
|
|
afd = &afdl[i];
|
|
goto found;
|
|
}
|
|
return ENI_FAMILY;
|
|
|
|
found:
|
|
if (salen != afd->a_socklen)
|
|
return ENI_SALEN;
|
|
|
|
port = ((struct sockinet *)sa)->si_port; /* network byte order */
|
|
addr = (char *)sa + afd->a_off;
|
|
|
|
if (serv == NULL || servlen == 0) {
|
|
/*
|
|
* do nothing in this case.
|
|
* in case you are wondering if "&&" is more correct than
|
|
* "||" here: RFC2553 says that serv == NULL OR servlen == 0
|
|
* means that the caller does not want the result.
|
|
*/
|
|
} else {
|
|
if (flags & NI_NUMERICSERV)
|
|
sp = NULL;
|
|
else {
|
|
sp = getservbyport(port,
|
|
(flags & NI_DGRAM) ? "udp" : "tcp");
|
|
}
|
|
if (sp) {
|
|
if (strlen(sp->s_name) > servlen)
|
|
return ENI_MEMORY;
|
|
strcpy(serv, sp->s_name);
|
|
} else {
|
|
snprintf(numserv, sizeof(numserv), "%d", ntohs(port));
|
|
if (strlen(numserv) > servlen)
|
|
return ENI_MEMORY;
|
|
strcpy(serv, numserv);
|
|
}
|
|
}
|
|
|
|
switch (sa->sa_family) {
|
|
case AF_INET:
|
|
v4a = (u_int32_t)
|
|
ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr);
|
|
if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
|
|
flags |= NI_NUMERICHOST;
|
|
v4a >>= IN_CLASSA_NSHIFT;
|
|
if (v4a == 0)
|
|
flags |= NI_NUMERICHOST;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
{
|
|
struct sockaddr_in6 *sin6;
|
|
sin6 = (struct sockaddr_in6 *)sa;
|
|
switch (sin6->sin6_addr.s6_addr[0]) {
|
|
case 0x00:
|
|
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
|
|
;
|
|
else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
|
|
;
|
|
else
|
|
flags |= NI_NUMERICHOST;
|
|
break;
|
|
default:
|
|
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
|
|
flags |= NI_NUMERICHOST;
|
|
}
|
|
else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
|
|
flags |= NI_NUMERICHOST;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
}
|
|
if (host == NULL || hostlen == 0) {
|
|
/*
|
|
* do nothing in this case.
|
|
* in case you are wondering if "&&" is more correct than
|
|
* "||" here: RFC2553 says that host == NULL OR hostlen == 0
|
|
* means that the caller does not want the result.
|
|
*/
|
|
} else if (flags & NI_NUMERICHOST) {
|
|
int numaddrlen;
|
|
|
|
/* NUMERICHOST and NAMEREQD conflicts with each other */
|
|
if (flags & NI_NAMEREQD)
|
|
return ENI_NOHOSTNAME;
|
|
if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
|
|
== NULL)
|
|
return ENI_SYSTEM;
|
|
numaddrlen = strlen(numaddr);
|
|
if (numaddrlen + 1 > hostlen) /* don't forget terminator */
|
|
return ENI_MEMORY;
|
|
strcpy(host, numaddr);
|
|
#if defined(INET6) && defined(NI_WITHSCOPEID)
|
|
if (afd->a_af == AF_INET6 &&
|
|
(IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)addr) ||
|
|
IN6_IS_ADDR_MULTICAST((struct in6_addr *)addr)) &&
|
|
((struct sockaddr_in6 *)sa)->sin6_scope_id) {
|
|
#ifndef ALWAYS_WITHSCOPE
|
|
if (flags & NI_WITHSCOPEID)
|
|
#endif /* !ALWAYS_WITHSCOPE */
|
|
{
|
|
char scopebuf[MAXHOSTNAMELEN], *s;
|
|
int scopelen;
|
|
|
|
if ((s = ip6_sa2str((struct sockaddr_in6 *)sa,
|
|
scopebuf, 0)) == NULL)
|
|
/* XXX what should we do? */
|
|
strcpy(scopebuf, "0");
|
|
|
|
scopelen = strlen(scopebuf);
|
|
if (scopelen + 1 + numaddrlen + 1 > hostlen)
|
|
return ENI_MEMORY;
|
|
|
|
#if 0
|
|
/*
|
|
* construct <scopeid><delim><numeric-addr>
|
|
*/
|
|
/*
|
|
* Shift the host string to allocate
|
|
* space for the scope ID part.
|
|
*/
|
|
memmove(host + scopelen + 1, host,
|
|
numaddrlen);
|
|
/* copy the scope ID and the delimiter */
|
|
memcpy(host, scopebuf, scopelen);
|
|
host[scopelen] = SCOPE_DELIMITER;
|
|
host[scopelen + 1 + numaddrlen] = '\0';
|
|
#else
|
|
/*
|
|
* construct <numeric-addr><delim><scopeid>
|
|
*/
|
|
memcpy(host + numaddrlen + 1, scopebuf,
|
|
scopelen);
|
|
host[numaddrlen] = SCOPE_DELIMITER;
|
|
host[numaddrlen + 1 + scopelen] = '\0';
|
|
#endif
|
|
}
|
|
}
|
|
#endif /* INET6 */
|
|
} else {
|
|
hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
|
|
h_error = h_errno;
|
|
|
|
if (hp) {
|
|
if (flags & NI_NOFQDN) {
|
|
p = strchr(hp->h_name, '.');
|
|
if (p) *p = '\0';
|
|
}
|
|
if (strlen(hp->h_name) > hostlen) {
|
|
return ENI_MEMORY;
|
|
}
|
|
strcpy(host, hp->h_name);
|
|
} else {
|
|
if (flags & NI_NAMEREQD)
|
|
return ENI_NOHOSTNAME;
|
|
if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
|
|
== NULL)
|
|
return ENI_NOHOSTNAME;
|
|
if (strlen(numaddr) > hostlen)
|
|
return ENI_MEMORY;
|
|
strcpy(host, numaddr);
|
|
}
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
#ifdef INET6
|
|
/* ARGSUSED */
|
|
static char *
|
|
ip6_sa2str(sa6, buf, flags)
|
|
struct sockaddr_in6 *sa6;
|
|
char *buf;
|
|
int flags;
|
|
{
|
|
unsigned int ifindex = (unsigned int)sa6->sin6_scope_id;
|
|
struct in6_addr *a6 = &sa6->sin6_addr;
|
|
|
|
#ifdef notyet
|
|
if (flags & NI_NUMERICSCOPE) {
|
|
sprintf(buf, "%d", sa6->sin6_scope_id);
|
|
return(buf);
|
|
}
|
|
#endif
|
|
|
|
if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6))
|
|
return(if_indextoname(ifindex, buf));
|
|
|
|
if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
|
|
return(NULL); /* XXX */
|
|
if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
|
|
return(NULL); /* XXX */
|
|
|
|
return(NULL); /* XXX */
|
|
}
|
|
#endif
|