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-rw-r--r--KAME/getnameinfo.c380
1 files changed, 380 insertions, 0 deletions
diff --git a/KAME/getnameinfo.c b/KAME/getnameinfo.c
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+/* $KAME: getnameinfo.c,v 1.72 2005/01/13 04:12:03 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:
+ * - 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). ipngwg rough consensus seems to follow RFC2553. RFC3493 says
+ * nothing about it, but defines a new error code EAI_OVERFLOW which seems
+ * to be intended the code for this case.
+ * - What is "local" in NI_NOFQDN? (see comments in the code)
+ * - NI_NAMEREQD and NI_NUMERICHOST conflict with each other.
+ * - (KAME extension) always attach textual scopeid (fe80::1%lo0), if
+ * sin6_scope_id is filled - standardization status?
+ * - what should we do if we should do getservbyport("sctp")?
+ */
+
+/*
+ * Considerations about thread-safeness
+ * The code in this file is thread-safe, and so the thread-safeness of
+ * getnameinfo() depends on the property of backend functions.
+ * - getservbyport() is not thread safe for most systems we are targeting.
+ * - getipnodebyaddr() is thread safe. However, many resolver libraries
+ * used in the function are not thread safe.
+ * - gethostbyaddr() is usually not thread safe.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifndef HAVE_GETNAMEINFO
+
+#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>
+#include <errno.h>
+
+#include <inttypes.h>
+#include "fetchmail.h"
+#include "getaddrinfo.h"
+
+static const struct afd {
+ int a_af;
+ int a_addrlen;
+ int a_socklen;
+ int a_off;
+ int a_portoff;
+} afdl [] = {
+#ifdef INET6
+ {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
+ offsetof(struct sockaddr_in6, sin6_addr),
+ offsetof(struct sockaddr_in6, sin6_port)},
+#endif
+ {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
+ offsetof(struct sockaddr_in, sin_addr),
+ offsetof(struct sockaddr_in, sin_port)},
+ {0, 0, 0, 0, 0},
+};
+
+#ifdef INET6
+static int ip6_parsenumeric __P((const struct sockaddr *, const char *, char *,
+ size_t, int));
+static int ip6_sa2str __P((const struct sockaddr_in6 *, char *, size_t, int));
+#endif
+
+int
+getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
+ const struct sockaddr *sa;
+#ifdef HAVE_SOCKLEN_T
+ socklen_t salen;
+#else
+ unsigned int salen;
+#endif
+ char *host;
+ size_t hostlen;
+ char *serv;
+ size_t servlen;
+ int flags;
+{
+ const struct afd *afd;
+ struct servent *sp;
+ struct hostent *hp;
+ u_short port;
+ int family, i;
+ const char *addr;
+ u_int32_t v4a;
+ int h_error;
+ char numserv[512];
+ char numaddr[512];
+
+ if (sa == NULL)
+ return EAI_FAIL;
+
+#ifdef HAVE_SA_LEN /*XXX*/
+ if (sa->sa_len != salen)
+ return EAI_FAIL;
+#endif
+
+ family = sa->sa_family;
+ for (i = 0; afdl[i].a_af; i++)
+ if (afdl[i].a_af == family) {
+ afd = &afdl[i];
+ goto found;
+ }
+ return EAI_FAMILY;
+
+ found:
+ if (salen != afd->a_socklen)
+ return EAI_FAIL;
+
+ /* network byte order */
+ memcpy(&port, (const char *)sa + afd->a_portoff, sizeof(port));
+ addr = (const 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: RFC3493 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) + 1 > servlen)
+ return EAI_OVERFLOW;
+ strlcpy(serv, sp->s_name, servlen);
+ } else {
+ snprintf(numserv, sizeof(numserv), "%u", ntohs(port));
+ if (strlen(numserv) + 1 > servlen)
+ return EAI_OVERFLOW;
+ strlcpy(serv, numserv, servlen);
+ }
+ }
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ v4a = (u_int32_t)
+ ntohl(((const 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:
+ {
+ const struct sockaddr_in6 *sin6;
+ sin6 = (const 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: RFC3493 says that host == NULL or hostlen == 0
+ * means that the caller does not want the result.
+ */
+ } else if (flags & NI_NUMERICHOST) {
+ /* NUMERICHOST and NAMEREQD conflicts with each other */
+ if (flags & NI_NAMEREQD)
+ return EAI_NONAME;
+
+ goto numeric;
+ } else {
+#ifdef USE_GETIPNODEBY
+ hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
+#else
+ hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
+#ifdef HAVE_H_ERRNO
+ h_error = h_errno;
+#else
+ h_error = EINVAL;
+#endif
+#endif
+
+ if (hp) {
+#if 0
+ if (flags & NI_NOFQDN) {
+ /*
+ * According to RFC3493 section 6.2, NI_NOFQDN
+ * means "node name portion of the FQDN shall
+ * be returned for local hosts." The following
+ * code tries to implement it by returning the
+ * first label (the part before the first
+ * period) of the FQDN. However, it is not
+ * clear if this always makes sense, since the
+ * given address may be outside of "local
+ * hosts." Due to the unclear description, we
+ * disable the code in this implementation.
+ */
+ char *p;
+ p = strchr(hp->h_name, '.');
+ if (p)
+ *p = '\0';
+ }
+#endif
+ if (strlen(hp->h_name) + 1 > hostlen) {
+#ifdef USE_GETIPNODEBY
+ freehostent(hp);
+#endif
+ return EAI_OVERFLOW;
+ }
+ strlcpy(host, hp->h_name, hostlen);
+#ifdef USE_GETIPNODEBY
+ freehostent(hp);
+#endif
+ } else {
+ if (flags & NI_NAMEREQD)
+ return EAI_NONAME;
+
+ numeric:
+ switch(afd->a_af) {
+#ifdef INET6
+ case AF_INET6:
+ {
+ int error;
+
+ if ((error = ip6_parsenumeric(sa, addr, host,
+ hostlen,
+ flags)) != 0)
+ return(error);
+ break;
+ }
+#endif
+ default:
+ if (inet_ntop(afd->a_af, addr, host,
+ hostlen) == NULL)
+ return EAI_SYSTEM;
+ break;
+ }
+ }
+ }
+ return(0);
+}
+
+#ifdef INET6
+static int
+ip6_parsenumeric(sa, addr, host, hostlen, flags)
+ const struct sockaddr *sa;
+ const char *addr;
+ char *host;
+ size_t hostlen;
+ int flags;
+{
+ int numaddrlen;
+ char numaddr[512];
+
+ if (inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr)) == NULL)
+ return EAI_SYSTEM;
+
+ numaddrlen = strlen(numaddr);
+ if (numaddrlen + 1 > hostlen) /* don't forget terminator */
+ return EAI_OVERFLOW;
+ strlcpy(host, numaddr, hostlen);
+
+ if (((const struct sockaddr_in6 *)sa)->sin6_scope_id) {
+ char zonebuf[MAXHOSTNAMELEN];
+ int zonelen;
+
+ zonelen = ip6_sa2str(
+ (const struct sockaddr_in6 *)(const void *)sa,
+ zonebuf, sizeof(zonebuf), flags);
+ if (zonelen < 0)
+ return EAI_OVERFLOW;
+ if (zonelen + 1 + numaddrlen + 1 > hostlen)
+ return EAI_OVERFLOW;
+
+ /* construct <numeric-addr><delim><zoneid> */
+ memcpy(host + numaddrlen + 1, zonebuf,
+ (size_t)zonelen);
+ host[numaddrlen] = SCOPE_DELIMITER;
+ host[numaddrlen + 1 + zonelen] = '\0';
+ }
+
+ return 0;
+}
+
+/* ARGSUSED */
+static int
+ip6_sa2str(sa6, buf, bufsiz, flags)
+ const struct sockaddr_in6 *sa6;
+ char *buf;
+ size_t bufsiz;
+ int flags;
+{
+ unsigned int ifindex;
+ const struct in6_addr *a6;
+ int n;
+
+ ifindex = (unsigned int)sa6->sin6_scope_id;
+ a6 = &sa6->sin6_addr;
+
+#ifdef NI_NUMERICSCOPE
+ if ((flags & NI_NUMERICSCOPE) != 0) {
+ n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id);
+ if (n < 0 || n >= bufsiz)
+ return -1;
+ else
+ return n;
+ }
+#endif
+
+ /* if_indextoname() does not take buffer size. not a good api... */
+ if ((IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
+ IN6_IS_ADDR_MC_NODELOCAL(a6)) && bufsiz >= IF_NAMESIZE) {
+ char *p = if_indextoname(ifindex, buf);
+ if (p)
+ return (strlen(p));
+ }
+
+ /* last resort */
+ n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id);
+ if (n < 0 || n >= bufsiz)
+ return -1;
+ else
+ return n;
+}
+#endif /* INET6 */
+#endif
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