1 files changed, 361 insertions, 0 deletions

diff --git a/src/lib/libc/net/getnameinfo.c b/src/lib/libc/net/getnameinfo.c
new file mode 100644
index 0000000000..2311eba7a0
--- /dev/null
+++ b/src/lib/libc/net/getnameinfo.c
@@ -0,0 +1,361 @@
+/*      $OpenBSD: getnameinfo.c,v 1.25 2002/06/27 09:24:28 itojun Exp $ */
+/*      $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) 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.
+ */
+
+#ifndef INET6
+#define INET6
+#endif
+
+#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>
+
+static const 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
+
+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;
+{
+        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;
+
+        if (sa->sa_len != salen)
+                return EAI_FAIL;
+        
+        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 *)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: 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 {
+                        sp = getservbyport(port,
+                            (flags & NI_DGRAM) ? "udp" : "tcp");
+                }
+                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 *)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: rfc2553bis-03 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 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);
+                h_error = h_errno;
+
+                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(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_MEMORY;
+        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_MEMORY;
+                if (zonelen + 1 + numaddrlen + 1 > hostlen)
+                        return EAI_MEMORY;
+
+                /* 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 notdef
+        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)) &&
+            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 */