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Diffstat (limited to 'newlib/libc/sys/linux/net/getnameinfo.c')
-rw-r--r--newlib/libc/sys/linux/net/getnameinfo.c372
1 files changed, 372 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/net/getnameinfo.c b/newlib/libc/sys/linux/net/getnameinfo.c
new file mode 100644
index 0000000..e2f9631
--- /dev/null
+++ b/newlib/libc/sys/linux/net/getnameinfo.c
@@ -0,0 +1,372 @@
+/* $KAME: getnameinfo.c,v 1.45 2000/09/25 22:43:56 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
+ * - 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) NI_WITHSCOPEID when called with global address,
+ * and sin6_scope_id filled
+ */
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <machine/endian.h>
+
+#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>
+
+#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 int ip6_parsenumeric(const struct sockaddr *, const char *, char *,
+ size_t, int);
+static int ip6_sa2str(const struct sockaddr_in6 *, char *, size_t, int);
+#endif
+
+/* 2553bis: use EAI_xx for getnameinfo */
+#define ENI_NOSOCKET EAI_FAIL /*XXX*/
+#define ENI_NOSERVNAME EAI_NONAME
+#define ENI_NOHOSTNAME EAI_NONAME
+#define ENI_MEMORY EAI_MEMORY
+#define ENI_SYSTEM EAI_SYSTEM
+#define ENI_FAMILY EAI_FAMILY
+#define ENI_SALEN EAI_FAMILY
+
+int
+getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
+ const struct sockaddr *sa;
+ socklen_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;
+ const char *addr;
+ u_int32_t v4a;
+ int h_error;
+ char numserv[512];
+ char numaddr[512];
+
+ if (sa == NULL)
+ return ENI_NOSOCKET;
+
+ 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;
+
+ /* network byte order */
+ port = ((const struct sockinet *)sa)->si_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: 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) + 1 > servlen)
+ return ENI_MEMORY;
+ strcpy(serv, sp->s_name);
+ } else {
+ snprintf(numserv, sizeof(numserv), "%d", ntohs(port));
+ if (strlen(numserv) + 1 > servlen)
+ return ENI_MEMORY;
+ strcpy(serv, numserv);
+ }
+ }
+
+ 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: 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;
+
+ 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 ENI_SYSTEM;
+ numaddrlen = strlen(numaddr);
+ if (numaddrlen + 1 > hostlen) /* don't forget terminator */
+ return ENI_MEMORY;
+ strcpy(host, numaddr);
+ break;
+ }
+ } else {
+ hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
+
+ 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) {
+ freehostent(hp);
+ return ENI_MEMORY;
+ }
+ strcpy(host, hp->h_name);
+ freehostent(hp);
+ } else {
+ if (flags & NI_NAMEREQD)
+ return ENI_NOHOSTNAME;
+ 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 ENI_SYSTEM;
+ break;
+ }
+ }
+ }
+ return SUCCESS;
+}
+
+#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 ENI_SYSTEM;
+
+ numaddrlen = strlen(numaddr);
+ if (numaddrlen + 1 > hostlen) /* don't forget terminator */
+ return ENI_MEMORY;
+ strcpy(host, numaddr);
+
+#ifdef NI_WITHSCOPEID
+ if (
+#ifdef DONT_OPAQUE_SCOPEID
+ (IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)addr) ||
+ IN6_IS_ADDR_MULTICAST((struct in6_addr *)addr)) &&
+#endif
+ ((const struct sockaddr_in6 *)sa)->sin6_scope_id) {
+#ifndef ALWAYS_WITHSCOPE
+ if (flags & NI_WITHSCOPEID)
+#endif /* !ALWAYS_WITHSCOPE */
+ {
+ char scopebuf[MAXHOSTNAMELEN];
+ int scopelen;
+
+ /* ip6_sa2str never fails */
+ scopelen = ip6_sa2str((const struct sockaddr_in6 *)sa,
+ scopebuf, sizeof(scopebuf),
+ flags);
+ if (scopelen + 1 + numaddrlen + 1 > hostlen)
+ return ENI_MEMORY;
+ /*
+ * construct <numeric-addr><delim><scopeid>
+ */
+ memcpy(host + numaddrlen + 1, scopebuf,
+ scopelen);
+ host[numaddrlen] = SCOPE_DELIMITER;
+ host[numaddrlen + 1 + scopelen] = '\0';
+ }
+ }
+#endif /* NI_WITHSCOPEID */
+
+ 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 = (unsigned int)sa6->sin6_scope_id;
+ const struct in6_addr *a6 = &sa6->sin6_addr;
+
+#ifdef NI_NUMERICSCOPE
+ if (flags & NI_NUMERICSCOPE) {
+ return(snprintf(buf, bufsiz, "%d", sa6->sin6_scope_id));
+ }
+#endif
+
+ /* 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));
+ }
+ }
+
+ /* last resort */
+ return(snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id));
+}
+#endif /* INET6 */