diff options
Diffstat (limited to 'StdLib/BsdSocketLib/getnameinfo.c')
| -rw-r--r-- | StdLib/BsdSocketLib/getnameinfo.c | 567 |
1 files changed, 567 insertions, 0 deletions
diff --git a/StdLib/BsdSocketLib/getnameinfo.c b/StdLib/BsdSocketLib/getnameinfo.c new file mode 100644 index 000000000..fab3460dc --- /dev/null +++ b/StdLib/BsdSocketLib/getnameinfo.c @@ -0,0 +1,567 @@ +/* $NetBSD: getnameinfo.c,v 1.45 2006/10/15 16:14:46 christos Exp $ */
+/* $KAME: getnameinfo.c,v 1.45 2000/09/25 22:43:56 itojun Exp $ */
+
+/*
+ * Copyright (c) 2000 Ben Harris.
+ * 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
+ * - 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.
+ * - What is "local" in NI_FQDN?
+ * - 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?
+ * XXX breaks backward compat for code that expects no scopeid.
+ * beware on merge.
+ */
+
+#define INET6 1
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: getnameinfo.c,v 1.45 2006/10/15 16:14:46 christos Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+#include "namespace.h"
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+//#include <net/if_ieee1394.h>
+//#include <net/if_types.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+#include <assert.h>
+#include <limits.h>
+#include <netdb.h>
+#include <resolv.h>
+#include <stddef.h>
+#include <string.h>
+
+#include <net/servent.h>
+
+#define CLLADDR(x) ( LLADDR(x) )
+#define endservent_r(svd) endservent()
+#define getservbyport_r(Port,pProto,pSv,pSvd) getservbyport(Port,pProto)
+
+#ifdef __weak_alias
+__weak_alias(getnameinfo,_getnameinfo)
+#endif
+
+static
+int
+hexname(
+ const u_int8_t * cp,
+ size_t len,
+ char * host,
+ socklen_t hostlen
+ );
+
+static const struct afd {
+ int a_af;
+ socklen_t a_addrlen;
+ socklen_t 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, 0},
+};
+
+struct sockinet {
+ u_char si_len;
+ u_char si_family;
+ u_short si_port;
+};
+
+static int getnameinfo_inet __P((const struct sockaddr *, socklen_t, char *,
+ socklen_t, char *, socklen_t, int));
+#ifdef INET6
+static int ip6_parsenumeric __P((const struct sockaddr *, const char *, char *,
+ socklen_t, int));
+static int ip6_sa2str __P((const struct sockaddr_in6 *, char *, size_t,
+ int));
+#endif
+static int getnameinfo_link __P((const struct sockaddr *, socklen_t, char *,
+ socklen_t, char *, socklen_t, int));
+static int hexname __P((const u_int8_t *, size_t, char *, socklen_t));
+
+/*
+ * Top-level getnameinfo() code. Look at the address family, and pick an
+ * appropriate function to call.
+ */
+int
+getnameinfo(
+ const struct sockaddr * sa,
+ socklen_t salen,
+ char * host,
+ socklen_t hostlen,
+ char * serv,
+ socklen_t servlen,
+ int flags
+ )
+{
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ case AF_INET6:
+ return getnameinfo_inet(sa, salen, host, hostlen,
+ serv, servlen, flags);
+ case AF_LINK:
+ return getnameinfo_link(sa, salen, host, hostlen,
+ serv, servlen, flags);
+ default:
+ return EAI_FAMILY;
+ }
+}
+
+
+/*
+ * getnameinfo_inet():
+ * Format an IPv4 or IPv6 sockaddr into a printable string.
+ */
+static
+int
+getnameinfo_inet(
+ const struct sockaddr * sa,
+ socklen_t salen,
+ char * host,
+ socklen_t hostlen,
+ char * serv,
+ socklen_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;
+ char numserv[512];
+ char numaddr[512];
+
+ /* sa is checked below */
+ /* host may be NULL */
+ /* serv may be NULL */
+
+ if (sa == NULL)
+ return EAI_FAIL;
+
+#ifdef BSD4_4
+ 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 */
+ port = ((const struct sockinet *)(const void *)sa)->si_port;
+ addr = (const char *)(const void *)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: rfc2553bis-03 says that serv == NULL OR
+ * servlen == 0 means that the caller does not want the result.
+ */
+ } else {
+ if (flags & NI_NUMERICSERV)
+ sp = NULL;
+ else {
+ struct servent_data svd;
+// struct servent sv;
+
+ (void)memset(&svd, 0, sizeof(svd));
+ sp = getservbyport_r(port,
+ (flags & NI_DGRAM) ? "udp" : "tcp", &sv, &svd);
+ endservent_r(&svd);
+ }
+ if (sp) {
+ if (strlen(sp->s_name) + 1 > servlen)
+ return EAI_MEMORY;
+ strlcpy(serv, sp->s_name, servlen);
+ } else {
+ snprintf(numserv, sizeof(numserv), "%u", ntohs(port));
+ if (strlen(numserv) + 1 > servlen)
+ return EAI_MEMORY;
+ strlcpy(serv, numserv, servlen);
+ }
+ }
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ v4a = (u_int32_t)
+ ntohl(((const struct sockaddr_in *)
+ (const void *)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 *)(const void *)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: rfc2553bis-03 says that host == NULL or
+ * hostlen == 0 means that the caller does not want the result.
+ */
+ } else if (flags & NI_NUMERICHOST) {
+ size_t numaddrlen;
+
+ /* NUMERICHOST and NAMEREQD conflicts with each other */
+ if (flags & NI_NAMEREQD)
+ return EAI_NONAME;
+
+ 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, numaddr, sizeof(numaddr))
+ == NULL)
+ return EAI_SYSTEM;
+ numaddrlen = strlen(numaddr);
+ if (numaddrlen + 1 > hostlen) /* don't forget terminator */
+ return EAI_MEMORY;
+ strlcpy(host, numaddr, hostlen);
+ break;
+ }
+ } else {
+ hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
+
+ if (hp) {
+#if 0
+ /*
+ * commented out, since "for local host" is not
+ * implemented here - see RFC2553 p30
+ */
+ if (flags & NI_NOFQDN) {
+ char *p;
+ p = strchr(hp->h_name, '.');
+ if (p)
+ *p = '\0';
+ }
+#endif
+ if (strlen(hp->h_name) + 1 > hostlen) {
+ return EAI_MEMORY;
+ }
+ strlcpy(host, hp->h_name, hostlen);
+ } else {
+ if (flags & NI_NAMEREQD)
+ return EAI_NONAME;
+ 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(
+ const struct sockaddr *sa,
+ const char *addr,
+ char *host,
+ socklen_t hostlen,
+ int flags
+ )
+{
+ size_t numaddrlen;
+ char numaddr[512];
+
+ _DIAGASSERT(sa != NULL);
+ _DIAGASSERT(addr != NULL);
+ _DIAGASSERT(host != NULL);
+
+ 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 *)(const void *)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 ((size_t) 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(
+ const struct sockaddr_in6 *sa6,
+ char *buf,
+ size_t bufsiz,
+ int flags
+ )
+{
+ unsigned int ifindex;
+ const struct in6_addr *a6;
+ int n;
+
+ _DIAGASSERT(sa6 != NULL);
+ _DIAGASSERT(buf != NULL);
+
+ 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) || ((size_t)n >= bufsiz))
+ return -1;
+ else
+ return n;
+ }
+#endif
+
+#if 0
+ /* if_indextoname() does not take buffer size. not a good api... */
+ if ((IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) &&
+ bufsiz >= IF_NAMESIZE) {
+ char *p = if_indextoname(ifindex, buf);
+ if (p) {
+ return(strlen(p));
+ }
+ }
+#endif // 0
+
+ /* last resort */
+ n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id);
+ if (n < 0 || (size_t) n >= bufsiz)
+ return -1;
+ else
+ return n;
+}
+#endif /* INET6 */
+
+
+/*
+ * getnameinfo_link():
+ * Format a link-layer address into a printable format, paying attention to
+ * the interface type.
+ */
+/* ARGSUSED */
+static
+int
+getnameinfo_link (
+ const struct sockaddr * sa,
+ socklen_t salen,
+ char * host,
+ socklen_t hostlen,
+ char * serv,
+ socklen_t servlen,
+ int flags
+ )
+{
+ const struct sockaddr_dl *sdl =
+ (const struct sockaddr_dl *)(const void *)sa;
+// const struct ieee1394_hwaddr *iha;
+ int n;
+
+ if (serv != NULL && servlen > 0)
+ *serv = '\0';
+
+ if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 && sdl->sdl_slen == 0) {
+ n = snprintf(host, hostlen, "link#%u", sdl->sdl_index);
+ if (n < 0 || (socklen_t) n > hostlen) {
+ *host = '\0';
+ return EAI_MEMORY;
+ }
+ return 0;
+ }
+
+#if 0
+ switch (sdl->sdl_type) {
+#ifdef IFT_ECONET
+ case IFT_ECONET:
+ if (sdl->sdl_alen < 2)
+ return EAI_FAMILY;
+ if (CLLADDR(sdl)[1] == 0)
+ n = snprintf(host, hostlen, "%u", CLLADDR(sdl)[0]);
+ else
+ n = snprintf(host, hostlen, "%u.%u",
+ CLLADDR(sdl)[1], CLLADDR(sdl)[0]);
+ if (n < 0 || (socklen_t) n >= hostlen) {
+ *host = '\0';
+ return EAI_MEMORY;
+ } else
+ return 0;
+#endif
+ case IFT_IEEE1394:
+ if (sdl->sdl_alen < sizeof(iha->iha_uid))
+ return EAI_FAMILY;
+ iha =
+ (const struct ieee1394_hwaddr *)(const void *)CLLADDR(sdl);
+ return hexname(iha->iha_uid, sizeof(iha->iha_uid),
+ host, hostlen);
+ /*
+ * The following have zero-length addresses.
+ * IFT_ATM (net/if_atmsubr.c)
+ * IFT_FAITH (net/if_faith.c)
+ * IFT_GIF (net/if_gif.c)
+ * IFT_LOOP (net/if_loop.c)
+ * IFT_PPP (net/if_ppp.c, net/if_spppsubr.c)
+ * IFT_SLIP (net/if_sl.c, net/if_strip.c)
+ * IFT_STF (net/if_stf.c)
+ * IFT_L2VLAN (net/if_vlan.c)
+ * IFT_PROPVIRTUAL (net/if_bridge.h>
+ */
+ /*
+ * The following use IPv4 addresses as link-layer addresses:
+ * IFT_OTHER (net/if_gre.c)
+ */
+ case IFT_ARCNET: /* default below is believed correct for all these. */
+ case IFT_ETHER:
+ case IFT_FDDI:
+ case IFT_HIPPI:
+ case IFT_ISO88025:
+ default:
+#endif // 0
+ return hexname((const u_int8_t *)CLLADDR(sdl),
+ (size_t)sdl->sdl_alen, host, hostlen);
+// }
+}
+
+static
+int
+hexname(
+ const u_int8_t * cp,
+ size_t len,
+ char * host,
+ socklen_t hostlen
+ )
+{
+ int n;
+ size_t i;
+ char *outp = host;
+
+ *outp = '\0';
+ for (i = 0; i < len; i++) {
+ n = snprintf(outp, hostlen, "%s%02x",
+ i ? ":" : "", cp[i]);
+ if (n < 0 || (socklen_t) n >= hostlen) {
+ *host = '\0';
+ return EAI_MEMORY;
+ }
+ outp += n;
+ hostlen -= n;
+ }
+ return 0;
+}
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