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-rw-r--r--lib/bind/irs/getnameinfo.c334
1 files changed, 334 insertions, 0 deletions
diff --git a/lib/bind/irs/getnameinfo.c b/lib/bind/irs/getnameinfo.c
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+++ b/lib/bind/irs/getnameinfo.c
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+/*
+ * Issues to be discussed:
+ * - Thread safe-ness must be checked
+ */
+
+#if ( defined(__linux__) || defined(__linux) || defined(LINUX) )
+#ifndef IF_NAMESIZE
+# ifdef IFNAMSIZ
+# define IF_NAMESIZE IFNAMSIZ
+# else
+# define IF_NAMESIZE 16
+# endif
+#endif
+#endif
+
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by WIDE Project and
+ * its contributors.
+ * 4. 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.
+ */
+
+#include <port_before.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+#include <arpa/nameser.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+
+#include <netdb.h>
+#include <resolv.h>
+#include <string.h>
+#include <stddef.h>
+
+#include <port_after.h>
+
+/*%
+ * Note that a_off will be dynamically adjusted so that to be consistent
+ * with the definition of sockaddr_in{,6}.
+ * The value presented below is just a guess.
+ */
+static struct afd {
+ int a_af;
+ int a_addrlen;
+ size_t a_socklen;
+ int a_off;
+} afdl [] = {
+ /* first entry is linked last... */
+ {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
+ offsetof(struct sockaddr_in, sin_addr)},
+ {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
+ offsetof(struct sockaddr_in6, sin6_addr)},
+ {0, 0, 0, 0},
+};
+
+struct sockinet {
+#ifdef HAVE_SA_LEN
+ u_char si_len;
+#endif
+ u_char si_family;
+ u_short si_port;
+};
+
+static int ip6_parsenumeric __P((const struct sockaddr *, const char *, char *,
+ size_t, int));
+#ifdef HAVE_SIN6_SCOPE_ID
+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;
+ 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;
+#ifdef HAVE_SA_LEN
+ size_t len;
+#endif
+ int family, i;
+ const char *addr;
+ char *p;
+ char numserv[512];
+ char numaddr[512];
+ const struct sockaddr_in6 *sin6;
+
+ if (sa == NULL)
+ return EAI_FAIL;
+
+#ifdef HAVE_SA_LEN
+ len = sa->sa_len;
+ if (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;
+
+ port = ((const struct sockinet *)sa)->si_port; /*%< network byte order */
+ addr = (const char *)sa + afd->a_off;
+
+ if (serv == NULL || servlen == 0U) {
+ /*
+ * rfc2553bis says that serv == NULL or servlen == 0 means that
+ * the caller does not want the result.
+ */
+ } else if (flags & NI_NUMERICSERV) {
+ sprintf(numserv, "%d", ntohs(port));
+ if (strlen(numserv) > servlen)
+ return EAI_MEMORY;
+ strcpy(serv, numserv);
+ } else {
+ sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp");
+ if (sp) {
+ if (strlen(sp->s_name) + 1 > servlen)
+ return EAI_MEMORY;
+ strcpy(serv, sp->s_name);
+ } else
+ return EAI_NONAME;
+ }
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ if (ntohl(*(const u_int32_t *)addr) >> IN_CLASSA_NSHIFT == 0)
+ flags |= NI_NUMERICHOST;
+ break;
+ case AF_INET6:
+ 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;
+ }
+ if (host == NULL || hostlen == 0U) {
+ /*
+ * rfc2553bis says that host == NULL or hostlen == 0 means that
+ * the caller does not want the result.
+ */
+ } else if (flags & NI_NUMERICHOST) {
+ goto numeric;
+ } else {
+ hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
+
+ if (hp) {
+ if (flags & NI_NOFQDN) {
+ p = strchr(hp->h_name, '.');
+ if (p) *p = '\0';
+ }
+ if (strlen(hp->h_name) + 1 > hostlen)
+ return EAI_MEMORY;
+ strcpy(host, hp->h_name);
+ } else {
+ if (flags & NI_NAMEREQD)
+ return EAI_NONAME;
+ numeric:
+ switch(afd->a_af) {
+ case AF_INET6:
+ {
+ int error;
+
+ if ((error = ip6_parsenumeric(sa, addr, host,
+ hostlen,
+ flags)) != 0)
+ return(error);
+ break;
+ }
+
+ default:
+ if (inet_ntop(afd->a_af, addr, numaddr,
+ sizeof(numaddr)) == NULL)
+ return EAI_NONAME;
+ if (strlen(numaddr) + 1 > hostlen)
+ return EAI_MEMORY;
+ strcpy(host, numaddr);
+ }
+ }
+ }
+ return(0);
+}
+
+static int
+ip6_parsenumeric(const struct sockaddr *sa, const char *addr, char *host,
+ size_t hostlen, int flags)
+{
+ size_t numaddrlen;
+ char numaddr[512];
+
+#ifndef HAVE_SIN6_SCOPE_ID
+ UNUSED(sa);
+ UNUSED(flags);
+#endif
+
+ 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_MEMORY;
+ strcpy(host, numaddr);
+
+#ifdef HAVE_SIN6_SCOPE_ID
+ if (((const struct sockaddr_in6 *)sa)->sin6_scope_id) {
+ char scopebuf[MAXHOSTNAMELEN]; /*%< XXX */
+ 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 EAI_MEMORY;
+
+ /* construct <numeric-addr><delim><scopeid> */
+ memcpy(host + numaddrlen + 1, scopebuf,
+ scopelen);
+ host[numaddrlen] = SCOPE_DELIMITER;
+ host[numaddrlen + 1 + scopelen] = '\0';
+ }
+#endif
+
+ return 0;
+}
+
+#ifdef HAVE_SIN6_SCOPE_ID
+/* ARGSUSED */
+static int
+ip6_sa2str(const struct sockaddr_in6 *sa6, char *buf,
+ size_t bufsiz, int flags)
+{
+#ifdef USE_IFNAMELINKID
+ unsigned int ifindex = (unsigned int)sa6->sin6_scope_id;
+ const struct in6_addr *a6 = &sa6->sin6_addr;
+#endif
+ char tmp[64];
+
+#ifdef NI_NUMERICSCOPE
+ if (flags & NI_NUMERICSCOPE) {
+ sprintf(tmp, "%u", sa6->sin6_scope_id);
+ if (bufsiz != 0U) {
+ strncpy(buf, tmp, bufsiz - 1);
+ buf[bufsiz - 1] = '\0';
+ }
+ return(strlen(tmp));
+ }
+#endif
+
+#ifdef USE_IFNAMELINKID
+ /*
+ * For a link-local address, convert the index to an interface
+ * name, assuming a one-to-one mapping between links and interfaces.
+ * Note, however, that this assumption is stronger than the
+ * specification of the scoped address architecture; the
+ * specficication says that more than one interfaces can belong to
+ * a single link.
+ */
+
+ /* 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
+
+ /* last resort */
+ sprintf(tmp, "%u", sa6->sin6_scope_id);
+ if (bufsiz != 0U) {
+ strncpy(buf, tmp, bufsiz - 1);
+ buf[bufsiz - 1] = '\0';
+ }
+ return(strlen(tmp));
+}
+#endif
+
+/*! \file */
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