* ext/socket: split files for each class.

* ext/socket/rubysocket.h: common header.

* ext/socket/basicsocket.c: new file for BasicSocket.

* ext/socket/ipsocket.c: new file for IPSocket.

* ext/socket/tcpsocket.c: new file for TCPSocket.

* ext/socket/tcpserver.c: new file for TCPServer.

* ext/socket/sockssocket.c: new file for SOCKSSocket.

* ext/socket/udpsocket.c: new file for UDPSocket.

* ext/socket/unixsocket.c: new file for UNIXSocket.

* ext/socket/unixserver.c: new file for UNIXServer.

* ext/socket/socket.c: now for Socket.

* ext/socket/raddrinfo.c: new file for AddrInfo and name resolution.

* ext/socket/constants.c: new file for constants.

* ext/socket/init.c: new file for utilities.

* ext/socket/mkconstants.rb: export *_to_int.

* ext/socket/extconf.rb: add new object files.

* ext/socket/depend: add dependencies for new files.

* ext/.document: add new files.



git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@21619 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1572 insertions, 0 deletions

diff --git a/ext/socket/raddrinfo.c b/ext/socket/raddrinfo.c
new file mode 100644
index 000000000..e85109e40
--- /dev/null
+++ b/ext/socket/raddrinfo.c
@@ -0,0 +1,1572 @@
+/************************************************
+
+  ainfo.c -
+
+  created at: Thu Mar 31 12:21:29 JST 1994
+
+  Copyright (C) 1993-2007 Yukihiro Matsumoto
+
+************************************************/
+
+#include "rubysocket.h"
+
+#if defined(INET6) && (defined(LOOKUP_ORDER_HACK_INET) || defined(LOOKUP_ORDER_HACK_INET6))
+#define LOOKUP_ORDERS (sizeof(lookup_order_table) / sizeof(lookup_order_table[0]))
+static const int lookup_order_table[] = {
+#if defined(LOOKUP_ORDER_HACK_INET)
+    PF_INET, PF_INET6, PF_UNSPEC,
+#elif defined(LOOKUP_ORDER_HACK_INET6)
+    PF_INET6, PF_INET, PF_UNSPEC,
+#else
+    /* should not happen */
+#endif
+};
+
+static int
+ruby_getaddrinfo(const char *nodename, const char *servname,
+		 const struct addrinfo *hints, struct addrinfo **res)
+{
+    struct addrinfo tmp_hints;
+    int i, af, error;
+
+    if (hints->ai_family != PF_UNSPEC) {
+	return getaddrinfo(nodename, servname, hints, res);
+    }
+
+    for (i = 0; i < LOOKUP_ORDERS; i++) {
+	af = lookup_order_table[i];
+	MEMCPY(&tmp_hints, hints, struct addrinfo, 1);
+	tmp_hints.ai_family = af;
+	error = getaddrinfo(nodename, servname, &tmp_hints, res);
+	if (error) {
+	    if (tmp_hints.ai_family == PF_UNSPEC) {
+		break;
+	    }
+	}
+	else {
+	    break;
+	}
+    }
+
+    return error;
+}
+#define getaddrinfo(node,serv,hints,res) ruby_getaddrinfo((node),(serv),(hints),(res))
+#endif
+
+#if defined(_AIX)
+static int
+ruby_getaddrinfo__aix(const char *nodename, const char *servname,
+		      struct addrinfo *hints, struct addrinfo **res)
+{
+    int error = getaddrinfo(nodename, servname, hints, res);
+    struct addrinfo *r;
+    if (error)
+	return error;
+    for (r = *res; r != NULL; r = r->ai_next) {
+	if (r->ai_addr->sa_family == 0)
+	    r->ai_addr->sa_family = r->ai_family;
+	if (r->ai_addr->sa_len == 0)
+	    r->ai_addr->sa_len = r->ai_addrlen;
+    }
+    return 0;
+}
+#undef getaddrinfo
+#define getaddrinfo(node,serv,hints,res) ruby_getaddrinfo__aix((node),(serv),(hints),(res))
+static int
+ruby_getnameinfo__aix(const struct sockaddr *sa, size_t salen,
+		      char *host, size_t hostlen,
+		      char *serv, size_t servlen, int flags)
+{
+    struct sockaddr_in6 *sa6;
+    u_int32_t *a6;
+
+    if (sa->sa_family == AF_INET6) {
+	sa6 = (struct sockaddr_in6 *)sa;
+	a6 = sa6->sin6_addr.u6_addr.u6_addr32;
+
+	if (a6[0] == 0 && a6[1] == 0 && a6[2] == 0 && a6[3] == 0) {
+	    strncpy(host, "::", hostlen);
+	    snprintf(serv, servlen, "%d", sa6->sin6_port);
+	    return 0;
+	}
+    }
+    return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
+}
+#undef getnameinfo
+#define getnameinfo(sa, salen, host, hostlen, serv, servlen, flags) \
+            ruby_getnameinfo__aix((sa), (salen), (host), (hostlen), (serv), (servlen), (flags))
+#endif
+
+#ifndef GETADDRINFO_EMU
+struct getaddrinfo_arg
+{
+    const char *node;
+    const char *service;
+    const struct addrinfo *hints;
+    struct addrinfo **res;
+};
+
+static VALUE
+nogvl_getaddrinfo(void *arg)
+{
+    struct getaddrinfo_arg *ptr = arg;
+    return getaddrinfo(ptr->node, ptr->service,
+                       ptr->hints, ptr->res);
+}
+#endif
+
+int
+rb_getaddrinfo(const char *node, const char *service,
+               const struct addrinfo *hints,
+               struct addrinfo **res)
+{
+#ifdef GETADDRINFO_EMU
+    return getaddrinfo(node, service, hints, res);
+#else
+    struct getaddrinfo_arg arg;
+    int ret;
+    arg.node = node;
+    arg.service = service;
+    arg.hints = hints;
+    arg.res = res;
+    ret = BLOCKING_REGION(nogvl_getaddrinfo, &arg);
+    return ret;
+#endif
+}
+
+#ifndef GETADDRINFO_EMU
+struct getnameinfo_arg
+{
+    const struct sockaddr *sa;
+    socklen_t salen;
+    char *host;
+    size_t hostlen;
+    char *serv;
+    size_t servlen;
+    int flags;
+};
+
+static VALUE
+nogvl_getnameinfo(void *arg)
+{
+    struct getnameinfo_arg *ptr = arg;
+    return getnameinfo(ptr->sa, ptr->salen,
+                       ptr->host, ptr->hostlen,
+                       ptr->serv, ptr->servlen,
+                       ptr->flags);
+}
+#endif
+
+int
+rb_getnameinfo(const struct sockaddr *sa, socklen_t salen,
+           char *host, size_t hostlen,
+           char *serv, size_t servlen, int flags)
+{
+#ifdef GETADDRINFO_EMU
+    return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
+#else
+    struct getnameinfo_arg arg;
+    int ret;
+    arg.sa = sa;
+    arg.salen = salen;
+    arg.host = host;
+    arg.hostlen = hostlen;
+    arg.serv = serv;
+    arg.servlen = servlen;
+    arg.flags = flags;
+    ret = BLOCKING_REGION(nogvl_getnameinfo, &arg);
+    return ret;
+#endif
+}
+
+static void
+make_ipaddr0(struct sockaddr *addr, char *buf, size_t len)
+{
+    int error;
+
+    error = rb_getnameinfo(addr, SA_LEN(addr), buf, len, NULL, 0, NI_NUMERICHOST);
+    if (error) {
+        raise_socket_error("getnameinfo", error);
+    }
+}
+
+VALUE
+make_ipaddr(struct sockaddr *addr)
+{
+    char buf[1024];
+
+    make_ipaddr0(addr, buf, sizeof(buf));
+    return rb_str_new2(buf);
+}
+
+static void
+make_inetaddr(long host, char *buf, size_t len)
+{
+    struct sockaddr_in sin;
+
+    MEMZERO(&sin, struct sockaddr_in, 1);
+    sin.sin_family = AF_INET;
+    SET_SIN_LEN(&sin, sizeof(sin));
+    sin.sin_addr.s_addr = host;
+    make_ipaddr0((struct sockaddr*)&sin, buf, len);
+}
+
+static int
+str_isnumber(const char *p)
+{
+    char *ep;
+
+    if (!p || *p == '\0')
+       return 0;
+    ep = NULL;
+    (void)STRTOUL(p, &ep, 10);
+    if (ep && *ep == '\0')
+       return 1;
+    else
+       return 0;
+}
+
+static char*
+host_str(VALUE host, char *hbuf, size_t len, int *flags_ptr)
+{
+    if (NIL_P(host)) {
+        return NULL;
+    }
+    else if (rb_obj_is_kind_of(host, rb_cInteger)) {
+        unsigned long i = NUM2ULONG(host);
+
+        make_inetaddr(htonl(i), hbuf, len);
+        if (flags_ptr) *flags_ptr |= AI_NUMERICHOST;
+        return hbuf;
+    }
+    else {
+        char *name;
+
+        SafeStringValue(host);
+        name = RSTRING_PTR(host);
+        if (!name || *name == 0 || (name[0] == '<' && strcmp(name, "<any>") == 0)) {
+            make_inetaddr(INADDR_ANY, hbuf, len);
+            if (flags_ptr) *flags_ptr |= AI_NUMERICHOST;
+        }
+        else if (name[0] == '<' && strcmp(name, "<broadcast>") == 0) {
+            make_inetaddr(INADDR_BROADCAST, hbuf, len);
+            if (flags_ptr) *flags_ptr |= AI_NUMERICHOST;
+        }
+        else if (strlen(name) >= len) {
+            rb_raise(rb_eArgError, "hostname too long (%"PRIuSIZE")",
+                strlen(name));
+        }
+        else {
+            strcpy(hbuf, name);
+        }
+        return hbuf;
+    }
+}
+
+static char*
+port_str(VALUE port, char *pbuf, size_t len, int *flags_ptr)
+{
+    if (NIL_P(port)) {
+        return 0;
+    }
+    else if (FIXNUM_P(port)) {
+        snprintf(pbuf, len, "%ld", FIX2LONG(port));
+#ifdef AI_NUMERICSERV
+        if (flags_ptr) *flags_ptr |= AI_NUMERICSERV;
+#endif
+        return pbuf;
+    }
+    else {
+        char *serv;
+
+        SafeStringValue(port);
+        serv = RSTRING_PTR(port);
+        if (strlen(serv) >= len) {
+            rb_raise(rb_eArgError, "service name too long (%"PRIuSIZE")",
+                strlen(serv));
+        }
+        strcpy(pbuf, serv);
+        return pbuf;
+    }
+}
+
+struct addrinfo*
+sock_getaddrinfo(VALUE host, VALUE port, struct addrinfo *hints, int socktype_hack)
+{
+    struct addrinfo* res = NULL;
+    char *hostp, *portp;
+    int error;
+    char hbuf[NI_MAXHOST], pbuf[NI_MAXSERV];
+    int additional_flags = 0;
+
+    hostp = host_str(host, hbuf, sizeof(hbuf), &additional_flags);
+    portp = port_str(port, pbuf, sizeof(pbuf), &additional_flags);
+
+    if (socktype_hack && hints->ai_socktype == 0 && str_isnumber(portp)) {
+       hints->ai_socktype = SOCK_DGRAM;
+    }
+    hints->ai_flags |= additional_flags;
+
+    error = rb_getaddrinfo(hostp, portp, hints, &res);
+    if (error) {
+        if (hostp && hostp[strlen(hostp)-1] == '\n') {
+            rb_raise(rb_eSocket, "newline at the end of hostname");
+        }
+        raise_socket_error("getaddrinfo", error);
+    }
+
+#if defined(__APPLE__) && defined(__MACH__)
+    {
+        struct addrinfo *r;
+        r = res;
+        while (r) {
+            if (! r->ai_socktype) r->ai_socktype = hints->ai_socktype;
+            if (! r->ai_protocol) {
+                if (r->ai_socktype == SOCK_DGRAM) {
+                    r->ai_protocol = IPPROTO_UDP;
+                }
+                else if (r->ai_socktype == SOCK_STREAM) {
+                    r->ai_protocol = IPPROTO_TCP;
+                }
+            }
+            r = r->ai_next;
+        }
+    }
+#endif
+    return res;
+}
+
+struct addrinfo*
+sock_addrinfo(VALUE host, VALUE port, int socktype, int flags)
+{
+    struct addrinfo hints;
+
+    MEMZERO(&hints, struct addrinfo, 1);
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = socktype;
+    hints.ai_flags = flags;
+    return sock_getaddrinfo(host, port, &hints, 1);
+}
+
+VALUE
+ipaddr(struct sockaddr *sockaddr, int norevlookup)
+{
+    VALUE family, port, addr1, addr2;
+    VALUE ary;
+    int error;
+    char hbuf[1024], pbuf[1024];
+    ID id;
+
+    id = intern_family(sockaddr->sa_family);
+    if (id) {
+        family = rb_str_dup(rb_id2str(id));
+    }
+    else {
+        sprintf(pbuf, "unknown:%d", sockaddr->sa_family);
+        family = rb_str_new2(pbuf);
+    }
+
+    addr1 = Qnil;
+    if (!norevlookup) {
+        error = rb_getnameinfo(sockaddr, SA_LEN(sockaddr), hbuf, sizeof(hbuf),
+                               NULL, 0, 0);
+        if (! error) {
+            addr1 = rb_str_new2(hbuf);
+        }
+    }
+    error = rb_getnameinfo(sockaddr, SA_LEN(sockaddr), hbuf, sizeof(hbuf),
+                           pbuf, sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV);
+    if (error) {
+        raise_socket_error("getnameinfo", error);
+    }
+    addr2 = rb_str_new2(hbuf);
+    if (addr1 == Qnil) {
+        addr1 = addr2;
+    }
+    port = INT2FIX(atoi(pbuf));
+    ary = rb_ary_new3(4, family, port, addr1, addr2);
+
+    return ary;
+}
+
+#ifdef HAVE_SYS_UN_H
+const char*
+unixpath(struct sockaddr_un *sockaddr, socklen_t len)
+{
+    if (sockaddr->sun_path < (char*)sockaddr + len)
+        return sockaddr->sun_path;
+    else
+        return "";
+}
+
+VALUE
+unixaddr(struct sockaddr_un *sockaddr, socklen_t len)
+{
+    return rb_assoc_new(rb_str_new2("AF_UNIX"),
+                        rb_str_new2(unixpath(sockaddr, len)));
+}
+#endif
+
+struct hostent_arg {
+    VALUE host;
+    struct addrinfo* addr;
+    VALUE (*ipaddr)(struct sockaddr*, size_t);
+};
+
+static VALUE
+make_hostent_internal(struct hostent_arg *arg)
+{
+    VALUE host = arg->host;
+    struct addrinfo* addr = arg->addr;
+    VALUE (*ipaddr)(struct sockaddr*, size_t) = arg->ipaddr;
+
+    struct addrinfo *ai;
+    struct hostent *h;
+    VALUE ary, names;
+    char **pch;
+    const char* hostp;
+    char hbuf[NI_MAXHOST];
+
+    ary = rb_ary_new();
+    if (addr->ai_canonname) {
+        hostp = addr->ai_canonname;
+    }
+    else {
+        hostp = host_str(host, hbuf, sizeof(hbuf), NULL);
+    }
+    rb_ary_push(ary, rb_str_new2(hostp));
+
+    if (addr->ai_canonname && (h = gethostbyname(addr->ai_canonname))) {
+        names = rb_ary_new();
+        if (h->h_aliases != NULL) {
+            for (pch = h->h_aliases; *pch; pch++) {
+                rb_ary_push(names, rb_str_new2(*pch));
+            }
+        }
+    }
+    else {
+        names = rb_ary_new2(0);
+    }
+    rb_ary_push(ary, names);
+    rb_ary_push(ary, INT2NUM(addr->ai_family));
+    for (ai = addr; ai; ai = ai->ai_next) {
+        rb_ary_push(ary, (*ipaddr)(ai->ai_addr, ai->ai_addrlen));
+    }
+
+    return ary;
+}
+
+VALUE
+make_hostent(VALUE host, struct addrinfo *addr, VALUE (*ipaddr)(struct sockaddr *, size_t))
+{
+    struct hostent_arg arg;
+
+    arg.host = host;
+    arg.addr = addr;
+    arg.ipaddr = ipaddr;
+    return rb_ensure(make_hostent_internal, (VALUE)&arg,
+                     RUBY_METHOD_FUNC(freeaddrinfo), (VALUE)addr);
+}
+
+typedef struct {
+    VALUE inspectname;
+    VALUE canonname;
+    int pfamily;
+    int socktype;
+    int protocol;
+    size_t sockaddr_len;
+    struct sockaddr_storage addr;
+} rb_addrinfo_t;
+
+static void
+addrinfo_mark(rb_addrinfo_t *rai)
+{
+    if (rai) {
+        rb_gc_mark(rai->inspectname);
+        rb_gc_mark(rai->canonname);
+    }
+}
+
+static void
+addrinfo_free(rb_addrinfo_t *rai)
+{
+    xfree(rai);
+}
+
+static VALUE
+addrinfo_s_allocate(VALUE klass)
+{
+    return Data_Wrap_Struct(klass, addrinfo_mark, addrinfo_free, 0);
+}
+
+#define IS_ADDRINFO(obj) (RDATA(obj)->dmark == (RUBY_DATA_FUNC)addrinfo_mark)
+static rb_addrinfo_t *
+check_addrinfo(VALUE self)
+{
+    Check_Type(self, RUBY_T_DATA);
+    if (!IS_ADDRINFO(self)) {
+        rb_raise(rb_eTypeError, "wrong argument type %s (expected AddrInfo)",
+                 rb_class2name(CLASS_OF(self)));
+    }
+    return DATA_PTR(self);
+}
+
+static rb_addrinfo_t *
+get_addrinfo(VALUE self)
+{
+    rb_addrinfo_t *rai = check_addrinfo(self);
+
+    if (!rai) {
+        rb_raise(rb_eTypeError, "uninitialized socket address");
+    }
+    return rai;
+}
+
+
+static rb_addrinfo_t *
+alloc_addrinfo()
+{
+    rb_addrinfo_t *rai = ALLOC(rb_addrinfo_t);
+    memset(rai, 0, sizeof(rb_addrinfo_t));
+    rai->inspectname = Qnil;
+    rai->canonname = Qnil;
+    return rai;
+}
+
+static void
+init_addrinfo(rb_addrinfo_t *rai, struct sockaddr *sa, size_t len,
+              int pfamily, int socktype, int protocol,
+              VALUE canonname, VALUE inspectname)
+{
+    if (sizeof(rai->addr) < len)
+        rb_raise(rb_eArgError, "sockaddr string too big");
+    memcpy((void *)&rai->addr, (void *)sa, len);
+    rai->sockaddr_len = len;
+
+    rai->pfamily = pfamily;
+    rai->socktype = socktype;
+    rai->protocol = protocol;
+    rai->canonname = canonname;
+    rai->inspectname = inspectname;
+}
+
+static VALUE
+addrinfo_new(struct sockaddr *addr, socklen_t len,
+             int family, int socktype, int protocol,
+             VALUE canonname, VALUE inspectname)
+{
+    VALUE a;
+    rb_addrinfo_t *rai;
+
+    a = addrinfo_s_allocate(rb_cAddrInfo);
+    DATA_PTR(a) = rai = alloc_addrinfo();
+    init_addrinfo(rai, addr, len, family, socktype, protocol, canonname, inspectname);
+    return a;
+}
+
+static struct addrinfo *
+call_getaddrinfo(VALUE node, VALUE service,
+                 VALUE family, VALUE socktype, VALUE protocol, VALUE flags,
+                 int socktype_hack)
+{
+    struct addrinfo hints, *res;
+
+    MEMZERO(&hints, struct addrinfo, 1);
+    hints.ai_family = NIL_P(family) ? PF_UNSPEC : family_arg(family);
+
+    if (!NIL_P(socktype)) {
+	hints.ai_socktype = socktype_arg(socktype);
+    }
+    if (!NIL_P(protocol)) {
+	hints.ai_protocol = NUM2INT(protocol);
+    }
+    if (!NIL_P(flags)) {
+	hints.ai_flags = NUM2INT(flags);
+    }
+    res = sock_getaddrinfo(node, service, &hints, socktype_hack);
+
+    if (res == NULL)
+	rb_raise(rb_eSocket, "host not found");
+    return res;
+}
+
+static void
+init_addrinfo_getaddrinfo(rb_addrinfo_t *rai, VALUE node, VALUE service,
+                          VALUE family, VALUE socktype, VALUE protocol, VALUE flags,
+                          VALUE inspectname)
+{
+    struct addrinfo *res = call_getaddrinfo(node, service, family, socktype, protocol, flags, 1);
+    VALUE canonname;
+
+    canonname = Qnil;
+    if (res->ai_canonname) {
+        canonname = rb_tainted_str_new_cstr(res->ai_canonname);
+        OBJ_FREEZE(canonname);
+    }
+
+    init_addrinfo(rai, res->ai_addr, res->ai_addrlen,
+                  NUM2INT(family), NUM2INT(socktype), NUM2INT(protocol),
+                  canonname, inspectname);
+
+    freeaddrinfo(res);
+}
+
+static VALUE
+make_inspectname(VALUE node, VALUE service)
+{
+    VALUE inspectname = Qnil;
+    if (TYPE(node) == T_STRING) {
+        inspectname = rb_str_dup(node);
+    }
+    if (TYPE(service) == T_STRING) {
+        if (NIL_P(inspectname))
+            inspectname = rb_sprintf(":%s", StringValueCStr(service));
+        else
+            rb_str_catf(inspectname, ":%s", StringValueCStr(service));
+    }
+    else if (TYPE(service) == T_FIXNUM && FIX2INT(service) != 0)
+    {
+        if (NIL_P(inspectname))
+            inspectname = rb_sprintf(":%d", FIX2INT(service));
+        else
+            rb_str_catf(inspectname, ":%d", FIX2INT(service));
+    }
+    if (!NIL_P(inspectname)) {
+        OBJ_INFECT(inspectname, node);
+        OBJ_INFECT(inspectname, service);
+        OBJ_FREEZE(inspectname);
+    }
+    return inspectname;
+}
+
+static VALUE
+addrinfo_firstonly_new(VALUE node, VALUE service, VALUE family, VALUE socktype, VALUE protocol, VALUE flags)
+{
+    VALUE ret;
+    VALUE canonname;
+    VALUE inspectname;
+
+    struct addrinfo *res = call_getaddrinfo(node, service, family, socktype, protocol, flags, 0);
+
+    inspectname = make_inspectname(node, service);
+
+    canonname = Qnil;
+    if (res->ai_canonname) {
+        canonname = rb_tainted_str_new_cstr(res->ai_canonname);
+        OBJ_FREEZE(canonname);
+    }
+
+    ret = addrinfo_new(res->ai_addr, res->ai_addrlen,
+                       res->ai_family, res->ai_socktype, res->ai_protocol,
+                       canonname, inspectname);
+
+    freeaddrinfo(res);
+    return ret;
+}
+
+static VALUE
+addrinfo_list_new(VALUE node, VALUE service, VALUE family, VALUE socktype, VALUE protocol, VALUE flags)
+{
+    VALUE ret;
+    struct addrinfo *r;
+    VALUE inspectname;
+
+    struct addrinfo *res = call_getaddrinfo(node, service, family, socktype, protocol, flags, 0);
+
+    inspectname = make_inspectname(node, service);
+
+    ret = rb_ary_new();
+    for (r = res; r; r = r->ai_next) {
+        VALUE addr;
+        VALUE canonname = Qnil;
+
+        if (r->ai_canonname) {
+            canonname = rb_tainted_str_new_cstr(r->ai_canonname);
+            OBJ_FREEZE(canonname);
+        }
+
+        addr = addrinfo_new(r->ai_addr, r->ai_addrlen,
+                            r->ai_family, r->ai_socktype, r->ai_protocol,
+                            canonname, inspectname);
+
+        rb_ary_push(ret, addr);
+    }
+
+    freeaddrinfo(res);
+    return ret;
+}
+
+
+#ifdef HAVE_SYS_UN_H
+static void
+init_unix_addrinfo(rb_addrinfo_t *rai, VALUE path)
+{
+    struct sockaddr_un un;
+
+    StringValue(path);
+
+    if (sizeof(un.sun_path) <= RSTRING_LEN(path))
+        rb_raise(rb_eArgError, "too long unix socket path (max: %dbytes)",
+            (int)sizeof(un.sun_path)-1);
+
+    MEMZERO(&un, struct sockaddr_un, 1);
+
+    un.sun_family = AF_UNIX;
+    memcpy((void*)&un.sun_path, RSTRING_PTR(path), RSTRING_LEN(path));
+   
+    init_addrinfo(rai, (struct sockaddr *)&un, sizeof(un), AF_UNIX, SOCK_STREAM, 0, Qnil, Qnil);
+}
+#endif
+
+/*
+ * call-seq:
+ *   AddrInfo.new(sockaddr)                             => addrinfo
+ *   AddrInfo.new(sockaddr, family)                     => addrinfo
+ *   AddrInfo.new(sockaddr, family, socktype)           => addrinfo
+ *   AddrInfo.new(sockaddr, family, socktype, protocol) => addrinfo
+ *
+ * returns a new instance of AddrInfo.
+ * It the instnace contains sockaddr, family, socktype, protocol.
+ * sockaddr means struct sockaddr which can be used for connect(2), etc.
+ * family, socktype and protocol are integers which is used for arguments of socket(2).
+ *
+ * sockaddr is specified as an array or a string.
+ * The array should be compatible to the value of IPSocket#addr or UNIXSocket#addr.
+ * The string should be struct sockaddr as generated by
+ * Socket.sockaddr_in or Socket.unpack_sockaddr_un.
+ *
+ * sockaddr examples:
+ * - ["AF_INET", 46102, "localhost.localdomain", "127.0.0.1"] 
+ * - ["AF_INET6", 42304, "ip6-localhost", "::1"] 
+ * - ["AF_UNIX", "/tmp/sock"] 
+ * - Socket.sockaddr_in("smtp", "2001:DB8::1")
+ * - Socket.sockaddr_in(80, "172.18.22.42")
+ * - Socket.sockaddr_in(80, "www.ruby-lang.org")
+ * - Socket.sockaddr_un("/tmp/sock")
+ *
+ * In an AF_INET/AF_INET6 sockaddr array, the 4th element,
+ * numeric IP address, is used to construct socket address in the AddrInfo instance.
+ * The 3rd element, textual host name, is also recorded but only used for AddrInfo#inspect.
+ *
+ * family is specified as an integer to specify the protocol family such as Socket::PF_INET.
+ * It can be a symbol or a string which is the constant name
+ * with or without PF_ prefix such as :INET, :INET6, :UNIX, "PF_INET", etc.
+ * If ommitted, PF_UNSPEC is assumed.
+ *
+ * socktype is specified as an integer to specify the socket type such as Socket::SOCK_STREAM.
+ * It can be a symbol or a string which is the constant name
+ * with or without SOCK_ prefix such as :STREAM, :DGRAM, :RAW, "SOCK_STREAM", etc.
+ * If ommitted, 0 is assumed.
+ *
+ * protocol is specified as an integer to specify the protocol such as Socket::IPPROTO_TCP.
+ * It must be an integer, unlike family and socktype.
+ * If ommitted, 0 is assumed.
+ * Note that 0 is reasonable value for most protocols, except raw socket.
+ *
+ */
+static VALUE
+addrinfo_initialize(int argc, VALUE *argv, VALUE self)
+{
+    rb_addrinfo_t *rai;
+    VALUE sockaddr_arg, sockaddr_ary, pfamily, socktype, protocol;
+    int i_pfamily, i_socktype, i_protocol;
+    struct sockaddr *sockaddr_ptr;
+    size_t sockaddr_len;
+    VALUE canonname = Qnil, inspectname = Qnil;
+
+    if (check_addrinfo(self))
+        rb_raise(rb_eTypeError, "already initialized socket address");
+    DATA_PTR(self) = rai = alloc_addrinfo();
+
+    rb_scan_args(argc, argv, "13", &sockaddr_arg, &pfamily, &socktype, &protocol);
+
+    i_pfamily = NIL_P(pfamily) ? PF_UNSPEC : family_arg(pfamily);
+    i_socktype = NIL_P(socktype) ? 0 : socktype_arg(socktype);
+    i_protocol = NIL_P(protocol) ? 0 : NUM2INT(protocol);
+
+    sockaddr_ary = rb_check_array_type(sockaddr_arg);
+    if (!NIL_P(sockaddr_ary)) {
+        VALUE afamily = rb_ary_entry(sockaddr_ary, 0);
+        int af;
+        StringValue(afamily);
+        if (family_to_int(RSTRING_PTR(afamily), RSTRING_LEN(afamily), &af) == -1)
+	    rb_raise(rb_eSocket, "unknown address family: %s", StringValueCStr(afamily));
+        switch (af) {
+          case AF_INET: /* ["AF_INET", 46102, "localhost.localdomain", "127.0.0.1"] */
+#ifdef INET6
+          case AF_INET6: /* ["AF_INET6", 42304, "ip6-localhost", "::1"] */
+#endif
+          {
+            VALUE service = rb_ary_entry(sockaddr_ary, 1);
+            VALUE nodename = rb_ary_entry(sockaddr_ary, 2);
+            VALUE numericnode = rb_ary_entry(sockaddr_ary, 3);
+            int flags;
+
+            service = INT2NUM(NUM2INT(service));
+            if (!NIL_P(nodename))
+                StringValue(nodename);
+            StringValue(numericnode);
+            flags = AI_NUMERICHOST;
+#ifdef AI_NUMERICSERV
+            flags |= AI_NUMERICSERV;
+#endif
+
+            init_addrinfo_getaddrinfo(rai, numericnode, service,
+                    INT2NUM(i_pfamily ? i_pfamily : af), INT2NUM(i_socktype), INT2NUM(i_protocol),
+                    INT2NUM(flags),
+                    rb_str_equal(numericnode, nodename) ? Qnil : make_inspectname(nodename, service));
+            break;
+          }
+
+#ifdef HAVE_SYS_UN_H
+          case AF_UNIX: /* ["AF_UNIX", "/tmp/sock"] */
+          {
+            VALUE path = rb_ary_entry(sockaddr_ary, 1);
+            StringValue(path);
+            init_unix_addrinfo(rai, path);
+            break;
+          }
+#endif
+
+          default:
+            rb_raise(rb_eSocket, "unexpected address family");
+        }
+    }
+    else {
+        StringValue(sockaddr_arg);
+        sockaddr_ptr = (struct sockaddr *)RSTRING_PTR(sockaddr_arg);
+        sockaddr_len = RSTRING_LEN(sockaddr_arg);
+        init_addrinfo(rai, sockaddr_ptr, sockaddr_len,
+                      i_pfamily, i_socktype, i_protocol,
+                      canonname, inspectname);
+    }
+
+    return self;
+}
+
+static int
+get_afamily(struct sockaddr *addr, socklen_t len)
+{
+    if ((char*)&addr->sa_family + sizeof(addr->sa_family) - (char*)addr <= len)
+        return addr->sa_family;
+    else
+        return AF_UNSPEC;
+}
+
+static int
+ai_get_afamily(rb_addrinfo_t *rai)
+{
+    return get_afamily((struct sockaddr *)&rai->addr, rai->sockaddr_len);
+}
+
+/*
+ * call-seq:
+ *   addrinfo.inspect => string
+ *
+ * returns a string which shows addrinfo in human-readable form.
+ *
+ *   AddrInfo.tcp("localhost", 80).inspect #=> "#<AddrInfo: 127.0.0.1:80 TCP (localhost:80)>"
+ *   AddrInfo.unix("/tmp/sock").inspect    #=> "#<AddrInfo: /tmp/sock SOCK_STREAM>"
+ *
+ */
+static VALUE
+addrinfo_inspect(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    int internet_p;
+    VALUE ret;
+
+    ret = rb_sprintf("#<%s: ", rb_obj_classname(self));
+
+    if (rai->sockaddr_len == 0) {
+        rb_str_cat2(ret, "empty-sockaddr");
+    }
+    else if (rai->sockaddr_len < ((char*)&rai->addr.ss_family + sizeof(rai->addr.ss_family)) - (char*)&rai->addr)
+        rb_str_cat2(ret, "too-short-sockaddr");
+    else {
+        switch (rai->addr.ss_family) {
+          case AF_INET:
+          {
+            struct sockaddr_in *addr;
+            int port;
+            if (rai->sockaddr_len < sizeof(struct sockaddr_in)) {
+                rb_str_cat2(ret, "too-short-AF_INET-sockaddr");
+            }
+            else {
+                addr = (struct sockaddr_in *)&rai->addr;
+                rb_str_catf(ret, "%d.%d.%d.%d",
+                            ((unsigned char*)&addr->sin_addr)[0],
+                            ((unsigned char*)&addr->sin_addr)[1],
+                            ((unsigned char*)&addr->sin_addr)[2],
+                            ((unsigned char*)&addr->sin_addr)[3]);
+                port = ntohs(addr->sin_port);
+                if (port)
+                    rb_str_catf(ret, ":%d", port);
+                if (sizeof(struct sockaddr_in) < rai->sockaddr_len)
+                    rb_str_catf(ret, "(sockaddr %d bytes too long)", (int)(rai->sockaddr_len - sizeof(struct sockaddr_in)));
+            }
+            break;
+          }
+
+#ifdef INET6
+          case AF_INET6:
+          {
+            struct sockaddr_in6 *addr;
+            char hbuf[1024];
+            int port;
+            int error;
+            if (rai->sockaddr_len < sizeof(struct sockaddr_in6)) {
+                rb_str_cat2(ret, "too-short-AF_INET6-sockaddr");
+            }
+            else {
+                addr = (struct sockaddr_in6 *)&rai->addr;
+                /* use getnameinfo for scope_id.
+                 * RFC 4007: IPv6 Scoped Address Architecture
+                 * draft-ietf-ipv6-scope-api-00.txt: Scoped Address Extensions to the IPv6 Basic Socket API
+                 */
+                error = getnameinfo((struct sockaddr *)&rai->addr, rai->sockaddr_len,
+                                    hbuf, sizeof(hbuf), NULL, 0,
+                                    NI_NUMERICHOST|NI_NUMERICSERV);
+                if (error) {
+                    raise_socket_error("getnameinfo", error);
+                }
+                if (addr->sin6_port == 0) {
+                    rb_str_cat2(ret, hbuf);
+                }
+                else {
+                    port = ntohs(addr->sin6_port);
+                    rb_str_catf(ret, "[%s]:%d", hbuf, port);
+                }
+                if (sizeof(struct sockaddr_in6) < rai->sockaddr_len)
+                    rb_str_catf(ret, "(sockaddr %d bytes too long)", (int)(rai->sockaddr_len - sizeof(struct sockaddr_in6)));
+            }
+            break;
+          }
+#endif
+
+#ifdef HAVE_SYS_UN_H
+          case AF_UNIX:
+          {
+            struct sockaddr_un *addr = (struct sockaddr_un *)&rai->addr;
+            char *p, *s, *t, *e;
+            s = addr->sun_path;
+            e = (char*)addr + rai->sockaddr_len;
+            if (e < s)
+                rb_str_cat2(ret, "too-short-AF_UNIX-sockaddr");
+            else if (s == e)
+                rb_str_cat2(ret, "empty-path-AF_UNIX-sockaddr");
+            else {
+                int printable_only = 1;
+                p = s;
+                while (p < e && *p != '\0') {
+                    printable_only = printable_only && ISPRINT(*p) && !ISSPACE(*p);
+                    p++;
+                }
+                t = p;
+                while (p < e && *p == '\0')
+                    p++;
+                if (printable_only && /* only printable, no space */
+                    t < e && /* NUL terminated */
+                    p == e) { /* no data after NUL */
+		    if (s == t)
+			rb_str_cat2(ret, "empty-path-AF_UNIX-sockaddr");
+		    else if (s[0] == '/') /* absolute path */
+			rb_str_cat2(ret, s);
+		    else
+                        rb_str_catf(ret, "AF_UNIX %s", s);
+                }
+                else {
+                    rb_str_cat2(ret, "AF_UNIX");
+                    e = (char *)addr->sun_path + sizeof(addr->sun_path);
+                    while (s < e && *(e-1) == '\0')
+                        e--;
+                    while (s < e)
+                        rb_str_catf(ret, ":%02x", (unsigned char)*s++);
+                }
+                if (addr->sun_path + sizeof(addr->sun_path) < (char*)&rai->addr + rai->sockaddr_len)
+                    rb_str_catf(ret, "(sockaddr %d bytes too long)",
+                            (int)(rai->sockaddr_len - (addr->sun_path + sizeof(addr->sun_path) - (char*)&rai->addr)));
+            }
+            break;
+          }
+#endif
+
+          default:
+          {
+            ID id = intern_family(rai->addr.ss_family);
+            if (id == 0)
+                rb_str_catf(ret, "unknown address family %d", rai->addr.ss_family);
+            else
+                rb_str_catf(ret, "%s address format unknown", rb_id2name(id));
+            break;
+          }
+        }
+    }
+
+    if (rai->pfamily && ai_get_afamily(rai) != rai->pfamily) {
+        ID id = intern_protocol_family(rai->pfamily);
+        if (id)
+            rb_str_catf(ret, " %s", rb_id2name(id));
+        else
+            rb_str_catf(ret, " PF_\?\?\?(%d)", rai->pfamily);
+    }
+
+    internet_p = rai->pfamily == PF_INET;
+#ifdef INET6
+    internet_p = internet_p || rai->pfamily == PF_INET6;
+#endif
+    if (internet_p && rai->socktype == SOCK_STREAM &&
+        (rai->protocol == 0 || rai->protocol == IPPROTO_TCP)) {
+        rb_str_cat2(ret, " TCP");
+    }
+    else if (internet_p && rai->socktype == SOCK_DGRAM &&
+        (rai->protocol == 0 || rai->protocol == IPPROTO_UDP)) {
+        rb_str_cat2(ret, " UDP");
+    }
+    else {
+        if (rai->socktype) {
+            ID id = intern_socktype(rai->socktype);
+            if (id)
+                rb_str_catf(ret, " %s", rb_id2name(id));
+            else
+                rb_str_catf(ret, " SOCK_\?\?\?(%d)", rai->socktype);
+        }
+
+        if (rai->protocol) {
+            if (internet_p) {
+                ID id = intern_ipproto(rai->protocol);
+                if (id)
+                    rb_str_catf(ret, " %s", rb_id2name(id));
+                else
+                    goto unknown_protocol;
+            }
+            else {
+              unknown_protocol:
+                rb_str_catf(ret, " UNKNOWN_PROTOCOL(%d)", rai->protocol);
+            }
+        }
+    }
+
+    if (!NIL_P(rai->canonname)) {
+        VALUE name = rai->canonname;
+        rb_str_catf(ret, " %s", StringValueCStr(name));
+    }
+
+    if (!NIL_P(rai->inspectname)) {
+        VALUE name = rai->inspectname;
+        rb_str_catf(ret, " (%s)", StringValueCStr(name));
+    }
+
+    rb_str_buf_cat2(ret, ">");
+    return ret;
+}
+
+/*
+ * call-seq:
+ *   addrinfo.afamily => integer
+ *
+ * returns the address family as an integer.
+ *
+ *   AddrInfo.tcp("localhost", 80).afamily == Socket::AF_INET #=> true
+ *
+ */
+static VALUE
+addrinfo_afamily(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    return INT2NUM(ai_get_afamily(rai));
+}
+
+/*
+ * call-seq:
+ *   addrinfo.pfamily => integer
+ *
+ * returns the protocol family as an integer.
+ *
+ *   AddrInfo.tcp("localhost", 80).pfamily == Socket::PF_INET #=> true
+ *
+ */
+static VALUE
+addrinfo_pfamily(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    return INT2NUM(rai->pfamily);
+}
+
+/*
+ * call-seq:
+ *   addrinfo.socktype => integer
+ *
+ * returns the socket type as an integer.
+ *
+ *   AddrInfo.tcp("localhost", 80).socktype == Socket::SOCK_STREAM #=> true
+ *
+ */
+static VALUE
+addrinfo_socktype(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    return INT2NUM(rai->socktype);
+}
+
+/*
+ * call-seq:
+ *   addrinfo.protocol => integer
+ *
+ * returns the socket type as an integer.
+ *
+ *   AddrInfo.tcp("localhost", 80).protocol == Socket::IPPROTO_TCP #=> true
+ *
+ */
+static VALUE
+addrinfo_protocol(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    return INT2NUM(rai->protocol);
+}
+
+/*
+ * call-seq:
+ *   addrinfo.to_sockaddr => string
+ *
+ * returns the socket address as packed struct sockaddr string.
+ *
+ *   AddrInfo.tcp("localhost", 80).to_sockaddr                    
+ *   #=> "\x02\x00\x00P\x7F\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
+ *
+ */
+static VALUE
+addrinfo_to_sockaddr(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    VALUE ret;
+    ret = rb_str_new((char*)&rai->addr, rai->sockaddr_len);
+    OBJ_INFECT(ret, self);
+    return ret;
+}
+
+/*
+ * call-seq:
+ *   addrinfo.canonname => string or nil
+ *
+ * returns the canonical name as an string.
+ *
+ * nil is returned if no canonical name.
+ *
+ * The canonical name is set by AddrInfo.getaddrinfo when AI_CANONNAME is specified.
+ *
+ *   list = AddrInfo.getaddrinfo("www.ruby-lang.org", 80, :INET, :STREAM, nil, Socket::AI_CANONNAME)
+ *   p list[0] #=> #<AddrInfo: 221.186.184.68:80 TCP carbon.ruby-lang.org (www.ruby-lang.org:80)>
+ *   p list[0].canonname #=> "carbon.ruby-lang.org"
+ *
+ */
+static VALUE
+addrinfo_canonname(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    return rai->canonname;
+}
+
+#ifdef AF_INET6
+# define IS_IP_FAMILY(af) ((af) == AF_INET || (af) == AF_INET6)
+#else
+# define IS_IP_FAMILY(af) ((af) == AF_INET)
+#endif
+
+/*
+ * call-seq:
+ *   addrinfo.ip? => true or false
+ *
+ * returns true if addrinfo is internet (IPv4/IPv6) address.
+ * returns false otherwise.
+ *
+ *   AddrInfo.tcp("127.0.0.1", 80).ip? #=> true
+ *   AddrInfo.tcp("::1", 80).ip?       #=> true
+ *   AddrInfo.unix("/tmp/sock").ip?    #=> false
+ *
+ */
+static VALUE
+addrinfo_ip_p(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    int family = ai_get_afamily(rai);
+    return IS_IP_FAMILY(family) ? Qtrue : Qfalse;
+}
+
+/*
+ * call-seq:
+ *   addrinfo.ipv4? => true or false
+ *
+ * returns true if addrinfo is IPv4 address.
+ * returns false otherwise.
+ *
+ *   AddrInfo.tcp("127.0.0.1", 80).ipv4? #=> true
+ *   AddrInfo.tcp("::1", 80).ipv4?       #=> false
+ *   AddrInfo.unix("/tmp/sock").ipv4?    #=> false
+ *
+ */
+static VALUE
+addrinfo_ipv4_p(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    return ai_get_afamily(rai) == AF_INET ? Qtrue : Qfalse;
+}
+
+/*
+ * call-seq:
+ *   addrinfo.ipv6? => true or false
+ *
+ * returns true if addrinfo is IPv6 address.
+ * returns false otherwise.
+ *
+ *   AddrInfo.tcp("127.0.0.1", 80).ipv6? #=> false
+ *   AddrInfo.tcp("::1", 80).ipv6?       #=> true
+ *   AddrInfo.unix("/tmp/sock").ipv6?    #=> false
+ *
+ */
+static VALUE
+addrinfo_ipv6_p(VALUE self)
+{
+#ifdef AF_INET6
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    return ai_get_afamily(rai) == AF_INET6 ? Qtrue : Qfalse;
+#else
+    return Qfalse;
+#endif
+}
+
+/*
+ * call-seq:
+ *   addrinfo.unix? => true or false
+ *
+ * returns true if addrinfo is UNIX address.
+ * returns false otherwise.
+ *
+ *   AddrInfo.tcp("127.0.0.1", 80).unix? #=> false
+ *   AddrInfo.tcp("::1", 80).unix?       #=> false
+ *   AddrInfo.unix("/tmp/sock").unix?    #=> true
+ *
+ */
+static VALUE
+addrinfo_unix_p(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+#ifdef AF_UNIX
+    return ai_get_afamily(rai) == AF_UNIX ? Qtrue : Qfalse;
+#else
+    return Qfalse;
+#endif
+}
+
+/*
+ * call-seq:
+ *   addrinfo.getnameinfo        => [nodename, service]
+ *   addrinfo.getnameinfo(flags) => [nodename, service]
+ *
+ * returns nodename and service as a pair of strings.
+ * This converts struct sockaddr in addrinfo to textual representation.
+ *
+ * flags should be bitwise OR of Socket::NI_??? constants.
+ *
+ *   AddrInfo.tcp("127.0.0.1", 80).getnameinfo #=> ["localhost", "www"]
+ *
+ *   AddrInfo.tcp("127.0.0.1", 80).getnameinfo(Socket::NI_NUMERICSERV)
+ *   #=> ["localhost", "80"]
+ */
+static VALUE
+addrinfo_getnameinfo(int argc, VALUE *argv, VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    VALUE vflags;
+    char hbuf[1024], pbuf[1024];
+    int flags, error;
+
+    rb_scan_args(argc, argv, "01", &vflags);
+
+    flags = NIL_P(vflags) ? 0 : NUM2INT(vflags);
+
+    if (rai->socktype == SOCK_DGRAM)
+        flags |= NI_DGRAM;
+
+    error = getnameinfo((struct sockaddr *)&rai->addr, rai->sockaddr_len,
+                        hbuf, sizeof(hbuf), pbuf, sizeof(pbuf),
+                        flags);
+    if (error) {
+        raise_socket_error("getnameinfo", error);
+    }
+
+    return rb_assoc_new(rb_str_new2(hbuf), rb_str_new2(pbuf));
+}
+
+/*
+ * call-seq:
+ *   addrinfo.ip_unpack => [addr, port]
+ *
+ * Returns the IP address and port number as 2-element array.
+ *
+ *   AddrInfo.tcp("127.0.0.1", 80).ip_unpack    #=> ["127.0.0.1", 80]
+ *   AddrInfo.tcp("::1", 80).ip_unpack          #=> ["::1", 80]
+ */
+static VALUE
+addrinfo_ip_unpack(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    int family = ai_get_afamily(rai);
+    VALUE vflags;
+    VALUE ret, portstr;
+
+    if (!IS_IP_FAMILY(family))
+	rb_raise(rb_eSocket, "need IPv4 or IPv6 address");
+
+    vflags = INT2NUM(NI_NUMERICHOST|NI_NUMERICSERV);
+    ret = addrinfo_getnameinfo(1, &vflags, self);
+    portstr = rb_ary_entry(ret, 1);
+    rb_ary_store(ret, 1, INT2NUM(atoi(StringValueCStr(portstr))));
+    return ret;
+}
+
+#ifdef HAVE_SYS_UN_H
+/*
+ * call-seq:
+ *   addrinfo.unix_path => path
+ *
+ * Returns the socket path as a string.
+ *
+ *   AddrInfo.unix("/tmp/sock").unix_path       #=> "/tmp/sock"
+ */
+static VALUE
+addrinfo_unix_path(VALUE self)
+{
+    rb_addrinfo_t *rai = get_addrinfo(self);
+    int family = ai_get_afamily(rai);
+    struct sockaddr_un *addr;
+    char *s, *e;
+
+    if (family != AF_UNIX)
+	rb_raise(rb_eSocket, "need AF_UNIX address");
+
+    addr = (struct sockaddr_un *)&rai->addr;
+
+    s = addr->sun_path;
+    e = (char*)addr + rai->sockaddr_len;
+    if (e < s)
+        rb_raise(rb_eSocket, "too short AF_UNIX address");
+    if (addr->sun_path + sizeof(addr->sun_path) < e)
+        rb_raise(rb_eSocket, "too long AF_UNIX address");
+    while (s < e && *(e-1) == '\0')
+        e--;
+    return rb_str_new(s, e-s);
+}
+#endif
+
+/*
+ * call-seq:
+ *   AddrInfo.getaddrinfo(nodename, service, family, socktype, protocol, flags) => [addrinfo, ...]
+ *   AddrInfo.getaddrinfo(nodename, service, family, socktype, protocol)        => [addrinfo, ...]
+ *   AddrInfo.getaddrinfo(nodename, service, family, socktype)                  => [addrinfo, ...]
+ *   AddrInfo.getaddrinfo(nodename, service, family)                            => [addrinfo, ...]
+ *   AddrInfo.getaddrinfo(nodename, service)                                    => [addrinfo, ...]
+ *
+ * returns a list of addrinfo objects as an array.
+ *
+ * This method converts nodename (hostname) and service (port) to addrinfo.
+ * Since the conversion is not unique, the result is a list of addrinfo objects.
+ *
+ * nodename or service can be nil if no conversion intended.
+ *
+ * family, socktype and protocol are hint for prefered protocol.
+ * If the result will be used for a socket with SOCK_STREAM, 
+ * SOCK_STREAM should be specified as socktype.
+ * If so, AddrInfo.getaddrinfo returns addrinfo list appropriate for SOCK_STREAM.
+ * If they are omitted or nil is given, the result is not restricted.
+ * 
+ * Similary, PF_INET6 as family restricts for IPv6.
+ *
+ * flags should be bitwise OR of Socket::AI_??? constants.
+ *
+ *   AddrInfo.getaddrinfo("www.kame.net", 80, nil, :STREAM)
+ *   #=> [#<AddrInfo: 203.178.141.194:80 TCP (www.kame.net:80)>,
+ *   #    #<AddrInfo: [2001:200:0:8002:203:47ff:fea5:3085]:80 TCP (www.kame.net:80)>]
+ *
+ */
+static VALUE
+addrinfo_s_getaddrinfo(int argc, VALUE *argv, VALUE self)
+{
+    VALUE node, service, family, socktype, protocol, flags;
+
+    rb_scan_args(argc, argv, "24", &node, &service, &family, &socktype, &protocol, &flags);
+    return addrinfo_list_new(node, service, family, socktype, protocol, flags);
+}
+
+
+/*
+ * call-seq:
+ *   AddrInfo.ip(host) => addrinfo
+ *
+ * returns an addrinfo object for IP address.
+ *
+ *   AddrInfo.ip("localhost") #=> #<AddrInfo: 127.0.0.1 (localhost)>
+ */
+static VALUE
+addrinfo_s_ip(VALUE self, VALUE host)
+{
+    VALUE ret;
+    rb_addrinfo_t *rai;
+    ret = addrinfo_firstonly_new(host, Qnil,
+            INT2NUM(PF_UNSPEC), INT2FIX(0), INT2FIX(0), INT2FIX(0));
+    rai = get_addrinfo(ret);
+    rai->socktype = 0;
+    rai->protocol = 0;
+    return ret;
+}
+
+/*
+ * call-seq:
+ *   AddrInfo.tcp(host, port) => addrinfo
+ *
+ * returns an addrinfo object for TCP address.
+ *
+ *   AddrInfo.tcp("localhost", "smtp") #=> #<AddrInfo: 127.0.0.1:25 TCP (localhost:smtp)>
+ */
+static VALUE
+addrinfo_s_tcp(VALUE self, VALUE host, VALUE port)
+{
+    return addrinfo_firstonly_new(host, port,
+            INT2NUM(PF_UNSPEC), INT2NUM(SOCK_STREAM), INT2NUM(IPPROTO_TCP), INT2FIX(0));
+}
+
+/*
+ * call-seq:
+ *   AddrInfo.udp(host, port) => addrinfo
+ *
+ * returns an addrinfo object for UDP address.
+ *
+ *   AddrInfo.udp("localhost", "daytime") #=> #<AddrInfo: 127.0.0.1:13 UDP (localhost:daytime)>
+ */
+static VALUE
+addrinfo_s_udp(VALUE self, VALUE host, VALUE port)
+{
+    return addrinfo_firstonly_new(host, port,
+            INT2NUM(PF_UNSPEC), INT2NUM(SOCK_DGRAM), INT2NUM(IPPROTO_UDP), INT2FIX(0));
+}
+
+#ifdef HAVE_SYS_UN_H
+
+/*
+ * call-seq:
+ *   AddrInfo.udp(host, port) => addrinfo
+ *
+ * returns an addrinfo object for UNIX socket address.
+ *
+ *   AddrInfo.unix("/tmp/sock") #=> #<AddrInfo: /tmp/sock SOCK_STREAM>
+ */
+static VALUE
+addrinfo_s_unix(VALUE self, VALUE path)
+{
+    VALUE addr;
+    rb_addrinfo_t *rai;
+
+    addr = addrinfo_s_allocate(rb_cAddrInfo);
+    DATA_PTR(addr) = rai = alloc_addrinfo();
+    init_unix_addrinfo(rai, path);
+    OBJ_INFECT(addr, path);
+    return addr;
+}
+
+#endif
+
+VALUE
+sockaddr_string_value(volatile VALUE *v)
+{
+    VALUE val = *v;
+    if (TYPE(val) == RUBY_T_DATA && IS_ADDRINFO(val)) {
+        *v = addrinfo_to_sockaddr(val);
+    }
+    StringValue(*v);
+    return *v;
+}
+
+char *
+sockaddr_string_value_ptr(volatile VALUE *v)
+{
+    sockaddr_string_value(v);
+    return RSTRING_PTR(*v);
+}
+
+VALUE
+fd_socket_addrinfo(int fd, struct sockaddr *addr, socklen_t len)
+{
+    int family;
+    int socktype;
+    int ret;
+    socklen_t optlen = sizeof(socktype);
+
+    /* assumes protocol family and address family are identical */
+    family = get_afamily(addr, len);
+
+    ret = getsockopt(fd, SOL_SOCKET, SO_TYPE, (void*)&socktype, &optlen);
+    if (ret == -1) {
+        rb_sys_fail("getsockopt(SO_TYPE)");
+    }
+
+    return addrinfo_new(addr, len, family, socktype, 0, Qnil, Qnil);
+}
+
+VALUE
+io_socket_addrinfo(VALUE io, struct sockaddr *addr, socklen_t len)
+{
+    rb_io_t *fptr;
+
+    switch (TYPE(io)) {
+      case T_FIXNUM:
+        return fd_socket_addrinfo(FIX2INT(io), addr, len);
+
+      case T_BIGNUM:
+        return fd_socket_addrinfo(NUM2INT(io), addr, len);
+
+      case T_FILE:
+        GetOpenFile(io, fptr);
+        return fd_socket_addrinfo(fptr->fd, addr, len);
+
+      default:
+        rb_raise(rb_eTypeError, "neither IO nor file descriptor");
+    }
+}
+
+/*
+ * AddrInfo class
+ */
+void
+Init_addrinfo(void)
+{
+    rb_cAddrInfo = rb_define_class("AddrInfo", rb_cData);
+    rb_define_alloc_func(rb_cAddrInfo, addrinfo_s_allocate);
+    rb_define_method(rb_cAddrInfo, "initialize", addrinfo_initialize, -1);
+    rb_define_method(rb_cAddrInfo, "inspect", addrinfo_inspect, 0);
+    rb_define_singleton_method(rb_cAddrInfo, "getaddrinfo", addrinfo_s_getaddrinfo, -1);
+    rb_define_singleton_method(rb_cAddrInfo, "ip", addrinfo_s_ip, 1);
+    rb_define_singleton_method(rb_cAddrInfo, "tcp", addrinfo_s_tcp, 2);
+    rb_define_singleton_method(rb_cAddrInfo, "udp", addrinfo_s_udp, 2);
+#ifdef HAVE_SYS_UN_H
+    rb_define_singleton_method(rb_cAddrInfo, "unix", addrinfo_s_unix, 1);
+#endif
+
+    rb_define_method(rb_cAddrInfo, "afamily", addrinfo_afamily, 0);
+    rb_define_method(rb_cAddrInfo, "pfamily", addrinfo_pfamily, 0);
+    rb_define_method(rb_cAddrInfo, "socktype", addrinfo_socktype, 0);
+    rb_define_method(rb_cAddrInfo, "protocol", addrinfo_protocol, 0);
+    rb_define_method(rb_cAddrInfo, "canonname", addrinfo_canonname, 0);
+
+    rb_define_method(rb_cAddrInfo, "ip?", addrinfo_ip_p, 0);
+    rb_define_method(rb_cAddrInfo, "ip_unpack", addrinfo_ip_unpack, 0);
+    rb_define_method(rb_cAddrInfo, "ipv4?", addrinfo_ipv4_p, 0);
+    rb_define_method(rb_cAddrInfo, "ipv6?", addrinfo_ipv6_p, 0);
+    rb_define_method(rb_cAddrInfo, "unix?", addrinfo_unix_p, 0);
+#ifdef HAVE_SYS_UN_H
+    rb_define_method(rb_cAddrInfo, "unix_path", addrinfo_unix_path, 0);
+#endif
+
+    rb_define_method(rb_cAddrInfo, "to_sockaddr", addrinfo_to_sockaddr, 0);
+
+    rb_define_method(rb_cAddrInfo, "getnameinfo", addrinfo_getnameinfo, -1);
+}