Sendmsg/recvmsg

Tanaka_A · January 30, 2009, 9:37am

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e$B$N$O$I$&$G$7$g$&$+!#e(B

sendmsg, recvmsg e$B$Oe(B POSIX e$B$GDj5A$5$l$F$$$^$9!#$=$7$F!“e(BIPv6
e$B$G$Oe(B sendmsg, recvmsg e$B$NJd=u%G!<%?$r;H$&5!G=$,e(B RFC
e$B$GDj5A$5e(B
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e$B$P!“e(BLinux e$B$de(B 4.4BSD e$B$K$b8GM-$N5!G=$,$”$j$^$9!#e(B
(IPv4 e$B$G%Q%1%C%H$,FO$$$?%"%I%l%9$rF@$k$H$+!#e(BLinux e$B$Ne(B ip(7)
e$B$H$+e(B 4.4BSD e$B$Ne(B ip(4) e$B$H$+$K:$C$F$$$^$9!#e(BIP
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e$B$Oe(B Socket.ip_address_list e$B$N$H$-$K=R$Y$^$7$?$,!"e(Bsendmsg,
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% svn diff --diff-cmd diff -x ‘-u -p’
Index: ext/.document

— ext/.document (revision 21891)
+++ ext/.document (working copy)
@@ -20,6 +20,7 @@ socket/udpsocket.c
socket/unixsocket.c
socket/unixserver.c
socket/socket.c
+socket/ancdata.c
socket/constants.c
socket/lib/socket.rb
stringio/stringio.c
Index: ext/socket/rubysocket.h

— ext/socket/rubysocket.h (revision 21891)
+++ ext/socket/rubysocket.h (working copy)
@@ -189,6 +189,7 @@ int socktype_arg(VALUE type);
int level_arg(VALUE level);
int optname_arg(int level, VALUE optname);
int shutdown_how_arg(VALUE how);
+int cmsg_type_arg(int level, VALUE optname);

int rb_getaddrinfo(const char *node, const char *service, const struct
addrinfo *hints, struct addrinfo **res);
int rb_getnameinfo(const struct sockaddr *sa, socklen_t salen, char
*host, size_t hostlen, char *serv, size_t servlen, int flags);
@@ -251,6 +252,7 @@ void Init_udpsocket(void);
void Init_unixsocket(void);
void Init_unixserver(void);
void Init_socket_constants(void);
+void Init_ancdata(void);
void Init_addrinfo(void);
void Init_socket_init(void);

Index: ext/socket/init.c

— ext/socket/init.c (revision 21891)
+++ ext/socket/init.c (working copy)
@@ -519,6 +519,7 @@ Init_socket_init()
Init_udpsocket();
Init_unixsocket();
Init_unixserver();

Init_ancdata();
Init_addrinfo();
Init_socket_constants();
}
Index: ext/socket/constants.c
===================================================================
— ext/socket/constants.c (revision 21891)
+++ ext/socket/constants.c (working copy)
@@ -92,6 +92,25 @@ shutdown_how_arg(VALUE how)
return constant_arg(how, shutdown_how_to_int, “unknown shutdown
argument”);
}

+int
+cmsg_type_arg(int level, VALUE optname)
+{

switch (level) {
```
 case SOL_SOCKET:
```

   return constant_arg(optname, scm_optname_to_int, "unknown UNIX

control message");

```
 case IPPROTO_IP:
```

   return constant_arg(optname, ip_optname_to_int, "unknown IP

control message");

```
 case IPPROTO_IPV6:
```

   return constant_arg(optname, ipv6_optname_to_int, "unknown IPv6

control message");

```
 case IPPROTO_TCP:
```

   return constant_arg(optname, tcp_optname_to_int, "unknown TCP

control message");

```
 case IPPROTO_UDP:
```

   return constant_arg(optname, udp_optname_to_int, "unknown UDP

control message");

```
 default:
```
```
   return NUM2INT(optname);
```
}
+}

static void
sock_define_const(const char *name, int value, VALUE mConst)
{
Index: ext/socket/depend

— ext/socket/depend (revision 21891)
+++ ext/socket/depend (working copy)
@@ -13,6 +13,7 @@ sockssocket.o: sockssocket.c $(SOCK_HEAD
udpsocket.o: udpsocket.c $(SOCK_HEADERS)
unixsocket.o: unixsocket.c $(SOCK_HEADERS)
unixserver.o: unixserver.c $(SOCK_HEADERS)
+ancdata.o: ancdata.c $(SOCK_HEADERS)
raddrinfo.o: raddrinfo.c $(SOCK_HEADERS)

getnameinfo.o: getnameinfo.c $(arch_hdrdir)/ruby/config.h addrinfo.h
sockport.h
Index: ext/socket/mkconstants.rb

— ext/socket/mkconstants.rb (revision 21891)
+++ ext/socket/mkconstants.rb (working copy)
@@ -249,11 +249,19 @@ def_name_to_int(“ipv6_optname_to_int”, /
def_name_to_int(“tcp_optname_to_int”, /\ATCP_/, “TCP_”)
def_name_to_int(“udp_optname_to_int”, /\AUDP_/, “UDP_”)
def_name_to_int(“shutdown_how_to_int”, /\ASHUT_/, “SHUT_”)
+def_name_to_int(“scm_optname_to_int”, /\ASCM_/, “SCM_”)

def_intern(‘intern_family’, /\AAF_/)
def_intern(‘intern_protocol_family’, /\APF_/)
def_intern(‘intern_socktype’, /\ASOCK_/)
def_intern(‘intern_ipproto’, /\AIPPROTO_/)
+def_intern(‘intern_level’, /\A(SOL_SOCKET\z|IPPROTO_)/,
/\A(SOL_|IPPROTO_)/)
+#def_intern(‘intern_so_optname’, /\ASO_/, “SO_”)
+def_intern(‘intern_ip_optname’, /\AIP_/, “IP_”)
+def_intern(‘intern_ipv6_optname’, /\AIPV6_/, “IPV6_”)
+def_intern(‘intern_tcp_optname’, /\ATCP_/, “TCP_”)
+def_intern(‘intern_udp_optname’, /\AUDP_/, “UDP_”)
+def_intern(‘intern_scm_optname’, /\ASCM_/, “SCM_”)

result = ERB.new(<<‘EOS’, nil, ‘%’).result(binding)
/* autogenerated file */
@@ -475,6 +483,35 @@ IP_DROP_MEMBERSHIP
IP_DEFAULT_MULTICAST_TTL
IP_DEFAULT_MULTICAST_LOOP
IP_MAX_MEMBERSHIPS
+IP_ROUTER_ALERT
+IP_PKTINFO
+IP_PKTOPTIONS
+IP_MTU_DISCOVER
+IP_RECVERR
+IP_RECVTOS
+IP_MTU
+IP_FREEBIND
+IP_IPSEC_POLICY
+IP_XFRM_POLICY
+IP_PASSSEC
+IP_PMTUDISC_DONT
+IP_PMTUDISC_WANT
+IP_PMTUDISC_DO
+IP_UNBLOCK_SOURCE
+IP_BLOCK_SOURCE
+IP_ADD_SOURCE_MEMBERSHIP
+IP_DROP_SOURCE_MEMBERSHIP
+IP_MSFILTER
+
+MCAST_JOIN_GROUP
+MCAST_BLOCK_SOURCE
+MCAST_UNBLOCK_SOURCE
+MCAST_LEAVE_GROUP
+MCAST_JOIN_SOURCE_GROUP
+MCAST_LEAVE_SOURCE_GROUP
+MCAST_MSFILTER
+MCAST_EXCLUDE
+MCAST_INCLUDE

SO_DEBUG
SO_REUSEADDR
@@ -610,3 +647,6 @@ INET_ADDRSTRLEN
INET6_ADDRSTRLEN

SOMAXCONN
+
+SCM_RIGHTS
+SCM_CREDENTIALS
Index: ext/socket/extconf.rb

— ext/socket/extconf.rb (revision 21891)
+++ ext/socket/extconf.rb (working copy)
@@ -254,6 +254,7 @@ $objs = [
“udpsocket.#{$OBJEXT}”,
“unixsocket.#{$OBJEXT}”,
“unixserver.#{$OBJEXT}”,

“ancdata.#{$OBJEXT}”,
“raddrinfo.#{$OBJEXT}”
]

Index: ext/socket/ancdata.c

— ext/socket/ancdata.c (revision 0)
+++ ext/socket/ancdata.c (revision 0)
@@ -0,0 +1,1070 @@
+#include “rubysocket.h”
+
+#if defined(HAVE_ST_MSG_CONTROL)
+static VALUE rb_cAncillaryData;
+
+static VALUE
+constant_to_sym(int constant, ID (*intern_const)(int))
+{

ID name = intern_const(constant);
if (name) {
```
   return ID2SYM(name);
```
}
return INT2NUM(constant);
+}

+static VALUE
+cmsg_type_to_sym(int level, int cmsg_type)
+{

switch (level) {
```
 case SOL_SOCKET:
```

   return constant_to_sym(cmsg_type, intern_scm_optname);

```
 case IPPROTO_IP:
```

   return constant_to_sym(cmsg_type, intern_ip_optname);

```
 case IPPROTO_IPV6:
```

   return constant_to_sym(cmsg_type, intern_ipv6_optname);

```
 case IPPROTO_TCP:
```

   return constant_to_sym(cmsg_type, intern_tcp_optname);

```
 case IPPROTO_UDP:
```

   return constant_to_sym(cmsg_type, intern_udp_optname);

```
 default:
```
```
   return INT2NUM(cmsg_type);
```
}
+}

+/*

- call-seq:
- Socket::AncillaryData.new(cmsg_level, cmsg_type, cmsg_data) ->
  ancillarydata
- cmsg_level should be an integer, a string or a symbol.
- - Socket::SOL_SOCKET, “SOL_SOCKET”, “SOCKET”, :SOL_SOCKET and
    :SOCKET
- - Socket::IPPROTO_IP, “IP” and :IP
- - Socket::IPPROTO_IPV6, “IPV6” and :IPV6
- - etc.
- cmsg_type should be an integer, a string or a symbol.
- If a string/symbol is specified, it is interepreted depend on
  cmsg_level.
- - Socket::SCM_RIGHTS, “SCM_RIGHTS”, “RIGHTS”, :SCM_RIGHTS, :RIGHTS
    for SOL_SOCKET
- - Socket::IP_RECVTTL, “RECVTTL” and :RECVTTL for IPPROTO_IP
- - Socket::IPV6_PKTINFO, “PKTINFO” and :PKTINFO for IPPROTO_IPV6
- - etc.
- cmsg_data should be a string.
- p Socket::AncillaryData.new(:IPV6, :PKTINFO, “”)
- #=> #<Socket::AncillaryData: IPV6 PKTINFO “”>
*/
+static VALUE
+ancillary_initialize(VALUE self, VALUE vlevel, VALUE vtype, VALUE data)
+{
int level;
StringValue(data);
level = level_arg(vlevel);
rb_ivar_set(self, rb_intern(“level”), INT2NUM(level));
rb_ivar_set(self, rb_intern(“type”), INT2NUM(cmsg_type_arg(level,
vtype)));
rb_ivar_set(self, rb_intern(“data”), data);
return self;
+}

+static VALUE
+ancdata_new(int level, int type, VALUE data)
+{

NEWOBJ(obj, struct RObject);
OBJSETUP(obj, rb_cAncillaryData, T_OBJECT);
StringValue(data);
ancillary_initialize((VALUE)obj, INT2NUM(level), INT2NUM(type),
data);
return (VALUE)obj;
+}

+static int
+ancillary_level(VALUE self)
+{

VALUE v = rb_attr_get(self, rb_intern(“level”));
return NUM2INT(v);
+}

+/*

- call-seq:
- ancillarydata.level => integer
- returns the cmsg level as an integer.
- p Socket::AncillaryData.new(:IPV6, :PKTINFO, “”).level
- #=> 41
*/
+static VALUE
+ancillary_level_m(VALUE self)
+{
return INT2NUM(ancillary_level(self));
+}

+static int
+ancillary_type(VALUE self)
+{

VALUE v = rb_attr_get(self, rb_intern(“type”));
return NUM2INT(v);
+}

+/*

- call-seq:
- ancillarydata.type => integer
- returns the cmsg type as an integer.
- p Socket::AncillaryData.new(:IPV6, :PKTINFO, “”).type
- #=> 2
*/
+static VALUE
+ancillary_type_m(VALUE self)
+{
return INT2NUM(ancillary_type(self));
+}

+/*

- call-seq:
- ancillarydata.data => string
- returns the cmsg data as a string.
- p Socket::AncillaryData.new(:IPV6, :PKTINFO, “”).data
- #=> “”
*/
+static VALUE
+ancillary_data(VALUE self)
+{
VALUE v = rb_attr_get(self, rb_intern(“data”));
StringValue(v);
return v;
+}

+/*

- call-seq:
- Socket::AncillaryData.int(cmsg_level, cmsg_type, integer) =>
  ancillarydata
- Creates a new Socket::AncillaryData object which contains a int as
  data.
- The size and endian is dependent on the host.
- p Socket::AncillaryData.int(:SOCKET, :RIGHTS, STDERR.fileno)
- #=> #<Socket::AncillaryData: SOCKET RIGHTS 2>
*/
+static VALUE
+ancillary_s_int(VALUE klass, VALUE vlevel, VALUE vtype, VALUE integer)
+{
int level = level_arg(vlevel);
int type = cmsg_type_arg(level, vtype);
int i = NUM2INT(integer);
return ancdata_new(level, type, rb_str_new((char*)&i, sizeof(i)));
+}

+/*

- call-seq:
- ancillarydata.int => integer
- Returns the data in ancillarydata as an int.
- The size and endian is dependent on the host.
- ancdata = Socket::AncillaryData.int(:SOCKET, :RIGHTS,
  STDERR.fileno)
- p ancdata.int => 2
*/
+static VALUE
+ancillary_int(VALUE self)
+{
VALUE data;
int i;
data = ancillary_data(self);
if (RSTRING_LEN(data) != sizeof(int))

   rb_raise(rb_eTypeError, "size differ.  expected as

sizeof(int)=%d but %ld", (int)sizeof(int), (long)RSTRING_LEN(data));

memcpy((char*)&i, RSTRING_PTR(data), sizeof(int));
return INT2NUM(i);
+}

+static VALUE
+ancillary_s_ip_pktinfo(VALUE self, VALUE v_addr, VALUE v_ifindex, VALUE
v_spec_dst)
+{
+#if defined(IPPROTO_IP) && defined(IP_PKTINFO) /* GNU/Linux */

unsigned int ifindex;
struct sockaddr_in sa;
struct in_pktinfo pktinfo;
SockAddrStringValue(v_addr);
ifindex = NUM2UINT(v_ifindex);
SockAddrStringValue(v_spec_dst);
memset(&pktinfo, 0, sizeof(pktinfo));
memset(&sa, 0, sizeof(sa));
if (RSTRING_LEN(v_addr) != sizeof(sa))

   rb_raise(rb_eArgError, "addr size different to AF_INET

sockaddr");

memcpy(&sa, RSTRING_PTR(v_addr), sizeof(sa));
if (sa.sin_family != AF_INET)

   rb_raise(rb_eArgError, "addr is not AF_INET sockaddr");

memcpy(&pktinfo.ipi_addr, &sa.sin_addr, sizeof(pktinfo.ipi_addr));
pktinfo.ipi_ifindex = ifindex;
memset(&sa, 0, sizeof(sa));
if (RSTRING_LEN(v_spec_dst) != sizeof(sa))

   rb_raise(rb_eArgError, "spec_dat size different to AF_INET

sockaddr");

memcpy(&sa, RSTRING_PTR(v_spec_dst), sizeof(sa));
if (sa.sin_family != AF_INET)

   rb_raise(rb_eArgError, "spec_dst is not AF_INET sockaddr");

memcpy(&pktinfo.ipi_spec_dst, &sa.sin_addr,
sizeof(pktinfo.ipi_spec_dst));
return ancdata_new(IPPROTO_IP, IP_PKTINFO, rb_str_new((char
*)&pktinfo, sizeof(pktinfo)));
+#else
rb_notimplement();
+#endif
+}

+static VALUE
+ancillary_ip_pktinfo(VALUE self)
+{
+#if defined(IPPROTO_IP) && defined(IP_PKTINFO) /* GNU/Linux */

int level, type;
VALUE data;
struct in_pktinfo pktinfo;
struct sockaddr_in sa;
VALUE v_spec_dst, v_addr;
level = ancillary_level(self);
type = ancillary_type(self);
data = ancillary_data(self);
if (level != IPPROTO_IP || type != IP_PKTINFO ||

   RSTRING_LEN(data) != sizeof(struct in_pktinfo)) {

   rb_raise(rb_eTypeError, "IP_PKTINFO ancillary data expected");

}
memcpy(&pktinfo, RSTRING_PTR(data), sizeof(struct in_pktinfo));
memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
memcpy(&sa.sin_addr, &pktinfo.ipi_addr, sizeof(sa.sin_addr));
v_addr = addrinfo_new((struct sockaddr *)&sa, sizeof(sa), PF_INET,
0, 0, Qnil, Qnil);
sa.sin_family = AF_INET;
memcpy(&sa.sin_addr, &pktinfo.ipi_spec_dst, sizeof(sa.sin_addr));
v_spec_dst = addrinfo_new((struct sockaddr *)&sa, sizeof(sa),
PF_INET, 0, 0, Qnil, Qnil);
return rb_ary_new3(3, v_addr, UINT2NUM(pktinfo.ipi_ifindex),
v_spec_dst);
+#else
rb_notimplement();
+#endif
+}

+static VALUE
+ancillary_s_ipv6_pktinfo(VALUE self, VALUE v_addr, VALUE v_ifindex)
+{
+#if defined(IPPROTO_IPV6) && defined(IPV6_PKTINFO) /* IPv6 RFC3542 */

unsigned int ifindex;
struct sockaddr_in6 sa;
struct in6_pktinfo pktinfo;
SockAddrStringValue(v_addr);
ifindex = NUM2UINT(v_ifindex);
memset(&pktinfo, 0, sizeof(pktinfo));
memset(&sa, 0, sizeof(sa));
if (RSTRING_LEN(v_addr) != sizeof(sa))

   rb_raise(rb_eArgError, "addr size different to AF_INET6

sockaddr");

memcpy(&sa, RSTRING_PTR(v_addr), sizeof(sa));
if (sa.sin6_family != AF_INET6)

   rb_raise(rb_eArgError, "addr is not AF_INET6 sockaddr");

memcpy(&pktinfo.ipi6_addr, &sa.sin6_addr,
sizeof(pktinfo.ipi6_addr));
pktinfo.ipi6_ifindex = ifindex;
return ancdata_new(IPPROTO_IPV6, IPV6_PKTINFO, rb_str_new((char
*)&pktinfo, sizeof(pktinfo)));
+#else
rb_notimplement();
+#endif
+}

+#if defined(IPPROTO_IPV6) && defined(IPV6_PKTINFO) /* IPv6 RFC3542 */
+static void
+extract_ipv6_pktinfo(VALUE self, struct in6_pktinfo *pktinfo_ptr,
struct sockaddr_in6 *sa_ptr)
+{

int level, type;
VALUE data;
level = ancillary_level(self);
type = ancillary_type(self);
data = ancillary_data(self);
if (level != IPPROTO_IPV6 || type != IPV6_PKTINFO ||

   RSTRING_LEN(data) != sizeof(struct in6_pktinfo)) {

   rb_raise(rb_eTypeError, "IPV6_PKTINFO ancillary data

expected");

}
memcpy(pktinfo_ptr, RSTRING_PTR(data), sizeof(*pktinfo_ptr));
memset(sa_ptr, 0, sizeof(*sa_ptr));
sa_ptr->sin6_family = AF_INET6;
memcpy(&sa_ptr->sin6_addr, &pktinfo_ptr->ipi6_addr,
sizeof(sa_ptr->sin6_addr));
if (IN6_IS_ADDR_LINKLOCAL(&sa_ptr->sin6_addr))

   sa_ptr->sin6_scope_id = pktinfo_ptr->ipi6_ifindex;

+}
+#endif
+
+static VALUE
+ancillary_ipv6_pktinfo(VALUE self)
+{
+#if defined(IPPROTO_IPV6) && defined(IPV6_PKTINFO) /* IPv6 RFC3542 */

struct in6_pktinfo pktinfo;
struct sockaddr_in6 sa;
VALUE v_addr;
extract_ipv6_pktinfo(self, &pktinfo, &sa);
v_addr = addrinfo_new((struct sockaddr *)&sa, sizeof(sa), PF_INET6,
0, 0, Qnil, Qnil);
return rb_ary_new3(2, v_addr, UINT2NUM(pktinfo.ipi6_ifindex));
+#else
rb_notimplement();
+#endif
+}

+static VALUE
+ancillary_ipv6_pktinfo_addr(VALUE self)
+{
+#if defined(IPPROTO_IPV6) && defined(IPV6_PKTINFO) /* IPv6 RFC3542 */

struct in6_pktinfo pktinfo;
struct sockaddr_in6 sa;
extract_ipv6_pktinfo(self, &pktinfo, &sa);
return addrinfo_new((struct sockaddr *)&sa, sizeof(sa), PF_INET6,
0, 0, Qnil, Qnil);
+#else
rb_notimplement();
+#endif
+}

+static VALUE
+ancillary_ipv6_pktinfo_ifindex(VALUE self)
+{
+#if defined(IPPROTO_IPV6) && defined(IPV6_PKTINFO) /* IPv6 RFC3542 */

struct in6_pktinfo pktinfo;
struct sockaddr_in6 sa;
extract_ipv6_pktinfo(self, &pktinfo, &sa);
return UINT2NUM(pktinfo.ipi6_ifindex);
+#else
rb_notimplement();
+#endif
+}

+#if defined(SOL_SOCKET) && defined(SCM_RIGHTS) /* 4.4BSD */
+static int
+anc_inspect_socket_rights(int level, int type, VALUE data, VALUE ret)
+{

if (level == SOL_SOCKET && type == SCM_RIGHTS &&

   0 < RSTRING_LEN(data) && (RSTRING_LEN(data) % sizeof(int) ==

0)) {

```
   long off;
```

   for (off = 0; off < RSTRING_LEN(data); off += sizeof(int)) {

```
       int fd;
```

       memcpy((char*)&fd, RSTRING_PTR(data)+off, sizeof(int));

```
       rb_str_catf(ret, " %d", fd);
```
```
   }
```
```
   return 0;
```
}
else {
```
   return -1;
```
}
+}
+#endif

+#if defined(IPPROTO_IP) && defined(IP_RECVDSTADDR) /* 4.4BSD */
+static int
+anc_inspect_ip_recvdstaddr(int level, int type, VALUE data, VALUE ret)
+{

if (level == IPPROTO_IP && type == IP_RECVDSTADDR &&

   RSTRING_LEN(data) == sizeof(struct in_addr)) {

```
   struct in_addr addr;
```
```
   char addrbuf[INET_ADDRSTRLEN];
```

   memcpy(&addr, RSTRING_PTR(data), sizeof(addr));

   if (inet_ntop(AF_INET, &addr, addrbuf, sizeof(addrbuf)) ==

NULL)

       rb_str_cat2(ret, " invalid-address");

```
   else
```

       rb_str_catf(ret, " %s", addrbuf);

```
   return 0;
```
}
else {
```
   return -1;
```
}
+}
+#endif

+#if defined(IPPROTO_IP) && defined(IP_PKTINFO) /* GNU/Linux */
+static int
+anc_inspect_ip_pktinfo(int level, int type, VALUE data, VALUE ret)
+{

if (level == IPPROTO_IP && type == IP_PKTINFO &&

   RSTRING_LEN(data) == sizeof(struct in_pktinfo)) {

```
   struct in_pktinfo pktinfo;
```

   char buf[INET_ADDRSTRLEN > IFNAMSIZ ? INET_ADDRSTRLEN :

IFNAMSIZ];

   memcpy(&pktinfo, RSTRING_PTR(data), sizeof(pktinfo));

   if (inet_ntop(AF_INET, &pktinfo.ipi_addr, buf, sizeof(buf)) ==

NULL)

       rb_str_cat2(ret, " addr:invalid-address");

```
   else
```

       rb_str_catf(ret, " addr:%s", buf);

   if (if_indextoname(pktinfo.ipi_ifindex, buf) == NULL)

       rb_str_catf(ret, " ifindex:%d", pktinfo.ipi_ifindex);

```
   else
```
```
       rb_str_catf(ret, " %s", buf);
```

   if (inet_ntop(AF_INET, &pktinfo.ipi_spec_dst, buf, sizeof(buf))

== NULL)

       rb_str_cat2(ret, " spec_dst:invalid-address");

```
   else
```

       rb_str_catf(ret, " spec_dst:%s", buf);

```
   return 0;
```
}
else {
```
   return -1;
```
}
+}
+#endif

+#if defined(IPPROTO_IPV6) && defined(IPV6_PKTINFO) /* IPv6 RFC3542 */
+static int
+anc_inspect_ipv6_pktinfo(int level, int type, VALUE data, VALUE ret)
+{

if (level == IPPROTO_IPV6 && type == IPV6_PKTINFO &&

   RSTRING_LEN(data) == sizeof(struct in6_pktinfo)) {

   struct in6_pktinfo *pktinfo = (struct in6_pktinfo

*)RSTRING_PTR(data);

```
   struct in6_addr addr;
```
```
   unsigned int ifindex;
```

   char addrbuf[INET6_ADDRSTRLEN], ifbuf[IFNAMSIZ];

   memcpy(&addr, &pktinfo->ipi6_addr, sizeof(addr));

   memcpy(&ifindex, &pktinfo->ipi6_ifindex, sizeof(ifindex));

   if (inet_ntop(AF_INET6, &addr, addrbuf, sizeof(addrbuf)) ==

NULL)

       rb_str_cat2(ret, " invalid-address");

```
   else
```

       rb_str_catf(ret, " %s", addrbuf);

   if (if_indextoname(ifindex, ifbuf) == NULL)

       rb_str_catf(ret, " ifindex:%d", ifindex);

```
   else
```
```
       rb_str_catf(ret, " %s", ifbuf);
```
```
   return 0;
```
}
else {
```
   return -1;
```
}
+}
+#endif

+/*

- call-seq:
- ancillarydata.inspect => string
- returns a string which shows ancillarydata in human-readable form.
- Socket::AncillaryData.new(:IPV6, :PKTINFO, “”).inspect
- #=> #<Socket::AncillaryData: IPV6 PKTINFO “”>
*/
+static VALUE
+ancillary_inspect(VALUE self)
+{
VALUE ret;
int level, type;
VALUE data;
ID level_id;
VALUE vtype;
level = ancillary_level(self);
type = ancillary_type(self);
data = ancillary_data(self);
ret = rb_sprintf("#<%s: ", rb_obj_classname(self));
level_id = intern_level(level);
if (level_id)

   rb_str_cat2(ret, rb_id2name(level_id));

else

   rb_str_catf(ret, "cmsg_level:%d", level);

vtype = cmsg_type_to_sym(level, type);
if (SYMBOL_P(vtype))

   rb_str_catf(ret, " %s", rb_id2name(SYM2ID(vtype)));

else

   rb_str_catf(ret, " cmsg_type:%d", type);

switch (level) {
+# if defined(SOL_SOCKET)
```
 case SOL_SOCKET:
```
```
   switch (type) {
```

+# if defined(SCM_RIGHTS) /* 4.4BSD */

     case SCM_RIGHTS: if (anc_inspect_socket_rights(level, type,

data, ret) == -1) goto dump; break;
+# endif

```
     default: goto dump;
```
```
   }
```
```
   break;
```

+# endif
+
+# if defined(IPPROTO_IP)

```
 case IPPROTO_IP:
```
```
   switch (type) {
```

+# if defined(IP_RECVDSTADDR) /* 4.4BSD */

     case IP_RECVDSTADDR: if (anc_inspect_ip_recvdstaddr(level,

type, data, ret) == -1) goto dump; break;
+# endif
+# if defined(IP_PKTINFO) /* GNU/Linux */

     case IP_PKTINFO: if (anc_inspect_ip_pktinfo(level, type,

data, ret) == -1) goto dump; break;
+# endif

```
     default: goto dump;
```
```
   }
```
```
   break;
```

+# endif
+
+# if defined(IPPROTO_IPV6)

```
 case IPPROTO_IPV6:
```
```
   switch (type) {
```

+# if defined(IPV6_PKTINFO) /* RFC 3542 */

     case IPV6_PKTINFO: if (anc_inspect_ipv6_pktinfo(level, type,

data, ret) == -1) goto dump; break;
+# endif

```
     default: goto dump;
```
```
   }
```
```
   break;
```

+# endif
+

```
 default:
```
```
 dump:
```
```
   data = rb_str_dump(data);
```

   rb_str_catf(ret, " %s", StringValueCStr(data));

}
rb_str_cat2(ret, “>”);
return ret;
+}

+/*

- call-seq:
- ancillarydata.cmsg_is?(level, type) => true or false
- tests the level and type of ancillarydata.
- ancdata = Socket::AncillaryData.new(:IPV6, :PKTINFO, “”)
- ancdata.cmsg_is?(Socket::IPPROTO_IPV6, Socket::IPV6_PKTINFO) #=>
  true
- ancdata.cmsg_is?(:IPV6, :PKTINFO) #=> true
- ancdata.cmsg_is?(:IP, :PKTINFO) #=> false
- ancdata.cmsg_is?(:SOCKET, :RIGHTS) #=> false
*/
+static VALUE
+ancillary_cmsg_is_p(VALUE self, VALUE vlevel, VALUE vtype)
+{
int level = level_arg(vlevel);
int type = cmsg_type_arg(level, vtype);
if (ancillary_level(self) == level &&
```
   ancillary_type(self) == type)
```
```
   return Qtrue;
```
else
```
   return Qfalse;
```

+}
+
+#endif
+
+#if defined(HAVE_SENDMSG)
+struct sendmsg_args_struct {

int fd;
const struct msghdr *msg;
int flags;
+};

+static VALUE
+nogvl_sendmsg_func(void *ptr)
+{

struct sendmsg_args_struct *args = ptr;
return sendmsg(args->fd, args->msg, args->flags);
+}

+static ssize_t
+rb_sendmsg(int fd, const struct msghdr *msg, int flags)
+{

struct sendmsg_args_struct args;
args.fd = fd;
args.msg = msg;
args.flags = flags;
return rb_thread_blocking_region(nogvl_sendmsg_func, &args,
RUBY_UBF_IO, 0);
+}

+static VALUE
+bsock_sendmsg_internal(int argc, VALUE *argv, VALUE sock, int nonblock)
+{

rb_io_t *fptr;
VALUE data, vflags, dest_sockaddr;
VALUE *controls_ptr;
int controls_num;
struct msghdr mh;
struct iovec iov;
+#if defined(HAVE_ST_MSG_CONTROL)
volatile VALUE controls_str = 0;
+#endif
int flags;
ssize_t ss;
rb_secure(4);
data = vflags = dest_sockaddr = Qnil;
controls_ptr = NULL;
controls_num = 0;
if (argc == 0)

   rb_raise(rb_eArgError, "mesg argument required");

data = argv[0];
if (1 < argc) vflags = argv[1];
if (2 < argc) dest_sockaddr = argv[2];
if (3 < argc) { controls_ptr = &argv[3]; controls_num = argc - 3; }
StringValue(data);
if (controls_num) {
+#if defined(HAVE_ST_MSG_CONTROL)
int i;
int last_pad = 0;
```
   controls_str = rb_str_tmp_new(0);
```

   for (i = 0; i < controls_num; i++) {

```
       VALUE elt = controls_ptr[i], v;
```
```
       VALUE vlevel, vtype;
```
```
       int level, type;
```
```
       VALUE cdata;
```
```
       long oldlen;
```
```
       struct cmsghdr *cmh;
```
```
       size_t cspace;
```

       v = rb_check_convert_type(elt, T_ARRAY, "Array", "to_ary");

```
       if (!NIL_P(v)) {
```
```
           elt = v;
```
```
           if (RARRAY_LEN(elt) != 3)
```

               rb_raise(rb_eArgError, "an element of controls

should be 3-elements array");

           vlevel = rb_ary_entry(elt, 0);

           vtype = rb_ary_entry(elt, 1);

           cdata = rb_ary_entry(elt, 2);

```
       }
```
```
       else {
```

           vlevel = rb_funcall(elt, rb_intern("level"), 0);

           vtype = rb_funcall(elt, rb_intern("type"), 0);

           cdata = rb_funcall(elt, rb_intern("data"), 0);

```
       }
```
```
       level = level_arg(vlevel);
```

       type = cmsg_type_arg(level, vtype);

```
       StringValue(cdata);
```

       oldlen = RSTRING_LEN(controls_str);

       cspace = CMSG_SPACE(RSTRING_LEN(cdata));

       rb_str_resize(controls_str, oldlen + cspace);

       cmh = (struct cmsghdr *)(RSTRING_PTR(controls_str)+oldlen);

```
       memset((char *)cmh, 0, cspace);
```
```
       cmh->cmsg_level = level;
```
```
       cmh->cmsg_type = type;
```

       cmh->cmsg_len = CMSG_LEN(RSTRING_LEN(cdata));

       MEMCPY(CMSG_DATA(cmh), RSTRING_PTR(cdata), char,

RSTRING_LEN(cdata));

```
 last_pad = cspace - cmh->cmsg_len;
```
```
   }
```
if (last_pad) {

 rb_str_set_len(controls_str, RSTRING_LEN(controls_str)-last_pad);

}
+#else
rb_raise(rb_eNotImpError, “control message for sendmsg is
unimplemented”);
+#endif
}
flags = NIL_P(vflags) ? 0 : NUM2INT(vflags);
+#ifdef MSG_DONTWAIT
if (nonblock)
```
   flags |= MSG_DONTWAIT;
```

+#endif
+

if (!NIL_P(dest_sockaddr))
SockAddrStringValue(dest_sockaddr);
GetOpenFile(sock, fptr);
retry:
memset(&mh, 0, sizeof(mh));
if (!NIL_P(dest_sockaddr)) {

   mh.msg_name = RSTRING_PTR(dest_sockaddr);

   mh.msg_namelen = RSTRING_LEN(dest_sockaddr);

}
mh.msg_iovlen = 1;
mh.msg_iov = &iov;
iov.iov_base = RSTRING_PTR(data);
iov.iov_len = RSTRING_LEN(data);
+#if defined(HAVE_ST_MSG_CONTROL)
if (controls_str) {

   mh.msg_control = RSTRING_PTR(controls_str);

   mh.msg_controllen = RSTRING_LEN(controls_str);

}
else {
```
   mh.msg_control = NULL;
```
```
   mh.msg_controllen = 0;
```
}
+#endif
rb_io_check_closed(fptr);
if (nonblock)
```
   rb_io_set_nonblock(fptr);
```
ss = rb_sendmsg(fptr->fd, &mh, flags);
if (!nonblock && rb_io_wait_writable(fptr->fd)) {
```
   rb_io_check_closed(fptr);
```
```
   goto retry;
```
}
if (ss == -1)
rb_sys_fail(“sendmsg(2)”);
return SSIZET2NUM(ss);
+}
+#else
+static VALUE
+bsock_sendmsg_internal(int argc, VALUE *argv, VALUE sock, int nonblock)
+{
rb_notimplement();
+}
+#endif

+/*

- call-seq:
- basicsocket.sendmsg(mesg, flags=0, dest_sockaddr=nil, *controls)
  => sent_len
- sendmsg sends a message using sendmsg(2) system call in blocking
  manner.
- mesg is a string to send.
- flags is bitwise OR of MSG_* constants such as Socket::MSG_OOB.
- dest_sockaddr is a destination socket address for connection-less
  socket.
- It should be a sockaddr such as a result of Socket.sockaddr_in.
- An AddrInfo object can be used too.
- controls is a list of ancillary data.
- The element of controls should be Socket::AncillaryData or
- 3-elements array.
- The 3-element array should contains cmsg_level, cmsg_type and data.
- The return value, sent_len, is an integer which is the number of
  bytes sent.
- sendmsg can be used to implement send_io as follows:
- use Socket::AncillaryData.
- ancdata = Socket::AncillaryData.int(:SOCKET, :RIGHTS, io.fileno)
- sock.sendmsg(“a”, 0, nil, ancdata)
- use 3-element array.
- ancdata = [:SOCKET, :RIGHTS, [io.fileno].pack(“i!”)]
- sock.sendmsg("\0", 0, nil, ancdata)
*/
+static VALUE
+bsock_sendmsg(int argc, VALUE *argv, VALUE sock)
+{
return bsock_sendmsg_internal(argc, argv, sock, 0);
+}

+/*

- call-seq:
- basicsocket.sendmsg_nonblock(mesg, flags=0, dest_sockaddr=nil,
  *controls) => sent_len
- sendmsg_nonblock sends a message using sendmsg(2) system call in
  non-blocking manner.
- It is similar to BasicSocket#sendmsg
- but the non-blocking flag is set before the system call
- and it doesn’t retry the system call.
*/
+static VALUE
+bsock_sendmsg_nonblock(int argc, VALUE *argv, VALUE sock)
+{
return bsock_sendmsg_internal(argc, argv, sock, 1);
+}

+#if defined(HAVE_RECVMSG)
+struct recvmsg_args_struct {

int fd;
struct msghdr *msg;
int flags;
+};

+static VALUE
+nogvl_recvmsg_func(void *ptr)
+{

struct recvmsg_args_struct *args = ptr;
return recvmsg(args->fd, args->msg, args->flags);
+}

+static ssize_t
+rb_recvmsg(int fd, struct msghdr *msg, int flags)
+{

struct recvmsg_args_struct args;
args.fd = fd;
args.msg = msg;
args.flags = flags;
return rb_thread_blocking_region(nogvl_recvmsg_func, &args,
RUBY_UBF_IO, 0);
+}

+static VALUE
+bsock_recvmsg_internal(int argc, VALUE *argv, VALUE sock, int nonblock)
+{

rb_io_t *fptr;
VALUE vmaxdatlen, vmaxctllen, vflags;
int grow_buffer;
size_t maxdatlen, maxctllen;
int flags, orig_flags;
struct msghdr mh;
struct iovec iov;
+#if defined(HAVE_ST_MSG_CONTROL)
struct cmsghdr *cmh;
+#endif
char namebuf[1024];
char datbuf0[4096], *datbuf;
char ctlbuf0[4096], *ctlbuf;
VALUE dat_str = Qnil;
VALUE ctl_str = Qnil;
VALUE ret;
ssize_t ss;
rb_secure(4);
rb_scan_args(argc, argv, “03”, &vmaxdatlen, &vflags, &vmaxctllen);
maxdatlen = NIL_P(vmaxdatlen) ? sizeof(datbuf0) :
NUM2SIZET(vmaxdatlen);
maxctllen = NIL_P(vmaxctllen) ? sizeof(ctlbuf0) :
NUM2SIZET(vmaxctllen);
flags = NIL_P(vflags) ? 0 : NUM2INT(vflags);
+#ifdef MSG_DONTWAIT
if (nonblock)
```
   flags |= MSG_DONTWAIT;
```

+#endif

orig_flags = flags;
grow_buffer = NIL_P(vmaxdatlen) || NIL_P(vmaxctllen);
GetOpenFile(sock, fptr);
if (rb_io_read_pending(fptr)) {

   rb_raise(rb_eIOError, "recvfrom for buffered IO");

}

+#if !defined(HAVE_ST_MSG_CONTROL)

if (grow_buffer) {
int socktype, optlen = sizeof(socktype);

   if (getsockopt(fptr->fd, SOL_SOCKET, SO_TYPE, (void*)&socktype,

&optlen) == -1) {

```
 rb_sys_fail("getsockopt(SO_TYPE)");
```
}
if (socktype == SOCK_STREAM)
```
 grow_buffer = 0;
```
}
+#endif
retry:
if (maxdatlen <= sizeof(datbuf0))
```
   datbuf = datbuf0;
```
else {
```
   if (NIL_P(dat_str))
```

       dat_str = rb_str_tmp_new(maxdatlen);

```
   else
```

       rb_str_resize(dat_str, maxdatlen);

```
   datbuf = RSTRING_PTR(dat_str);
```
}
if (maxctllen <= sizeof(ctlbuf0))
```
   ctlbuf = ctlbuf0;
```
else {
```
   if (NIL_P(ctl_str))
```

       ctl_str = rb_str_tmp_new(maxctllen);

```
   else
```

       rb_str_resize(ctl_str, maxctllen);

```
   ctlbuf = RSTRING_PTR(ctl_str);
```
}
memset(&mh, 0, sizeof(mh));
memset(namebuf, 0, sizeof(namebuf));
mh.msg_name = namebuf;
mh.msg_namelen = sizeof(namebuf);
mh.msg_iov = &iov;
mh.msg_iovlen = 1;
iov.iov_base = datbuf;
iov.iov_len = maxdatlen;

+#if defined(HAVE_ST_MSG_CONTROL)

mh.msg_control = ctlbuf;
mh.msg_controllen = maxctllen;
+#endif
if (grow_buffer)
```
   flags |= MSG_PEEK;
```
rb_io_check_closed(fptr);
if (nonblock)
```
   rb_io_set_nonblock(fptr);
```
ss = rb_recvmsg(fptr->fd, &mh, flags);
if (!nonblock && rb_io_wait_readable(fptr->fd)) {
```
   rb_io_check_closed(fptr);
```
```
   goto retry;
```
}
if (grow_buffer) {
int grown = 0;
+#if defined(HAVE_ST_MSG_CONTROL)

   if (NIL_P(vmaxdatlen) && (mh.msg_flags & MSG_TRUNC)) {

```
 maxdatlen *= 2;
```
```
 grown = 1;
```
}

   if (NIL_P(vmaxctllen) && (mh.msg_flags & MSG_CTRUNC)) {

```
 maxctllen *= 2;
```
```
 grown = 1;
```
}
+#else
if (NIL_P(vmaxdatlen) && ss != -1 && ss == iov.iov_len) {
```
 maxdatlen *= 2;
```
```
 grown = 1;
```
}
+#endif
if (grown) {
```
 goto retry;
```
}
else {
```
       grow_buffer = 0;
```
```
       if (flags != orig_flags) {
```
```
           flags = orig_flags;
```
```
           goto retry;
```
```
       }
```
```
   }
```
}
if (ss == -1)
rb_sys_fail(“recvmsg(2)”);
if (NIL_P(dat_str))

   dat_str = rb_tainted_str_new(datbuf, ss);

else {
```
   rb_str_resize(dat_str, ss);
```
```
   OBJ_TAINT(dat_str);
```

   RBASIC(dat_str)->klass = rb_cString;

}
ret = rb_ary_new3(3, dat_str,

                    io_socket_addrinfo(sock, mh.msg_name,

mh.msg_namelen),
+#if defined(HAVE_ST_MSG_CONTROL)

```
  INT2NUM(mh.msg_flags)
```

+#else

```
  Qnil
```

+#endif

```
  );
```

+#if defined(HAVE_ST_MSG_CONTROL)

if (mh.msg_controllen) {

   for (cmh = CMSG_FIRSTHDR(&mh); cmh != NULL; cmh =

CMSG_NXTHDR(&mh, cmh)) {

```
       VALUE ctl;
```
```
       size_t clen;
```
```
       if (cmh->cmsg_len == 0) {
```

           rb_raise(rb_eIOError, "invalid control message

(cmsg_len == 0)");

```
       }
```

       clen = (char*)cmh + cmh->cmsg_len - (char*)CMSG_DATA(cmh);

       ctl = ancdata_new(cmh->cmsg_level, cmh->cmsg_type,

rb_tainted_str_new((char*)CMSG_DATA(cmh), clen));

```
       rb_ary_push(ret, ctl);
```
```
   }
```
}
+#endif
return ret;
+}
+#else
+static VALUE
+bsock_recvmsg_internal(int argc, VALUE *argv, VALUE sock, int nonblock)
+{
rb_notimplement();
+}
+#endif

+/*

- call-seq:
- basicsocket.recvmsg(maxmesglen=nil, flags=0, maxcontrollen=nil)
  => [mesg, sender_addrinfo, rflags, *controls]
- recvmsg receives a message using recvmsg(2) system call in blocking
  manner.
- maxmesglen is the maximum length of mesg to receive.
- flags is bitwise OR of MSG_* constants such as Socket::MSG_PEEK.
- maxcontrolslen is the maximum length of controls (ancillary data)
  to receive.
- The return value is 4-elements array.
- mesg is a string of the received message.
- sender_addrinfo is a sender socket address for connection-less
  socket.
- It is an AddrInfo object.
- For connection-oriented socket such as TCP, sender_addrinfo is
  platform dependent.
- rflags is a flags on the received message which is bitwise OR of
  MSG_* constants such as Socket::MSG_TRUNC.
- It will be nil if the system uses 4.3BSD style old recvmsg system
  call.
- controls is ancillary data which is an array of
  Socket::AncillaryData objects such as:
- #<Socket::AncillaryData: SOCKET RIGHTS 7>
- maxmesglen and maxcontrolslen can be nil.
- In that case, the buffer will be grown until the message is not
  truncated.
- Internally, MSG_PEEK is used and MSG_TRUNC/MSG_CTRUNC are checked.
- sendmsg can be used to implement recv_io as follows:
- mesg, sender_sockaddr, rflags, *controls = sock.recvmsg
- controls.each {|ancdata|

if ancdata.level == Socket::SOL_SOCKET && ancdata.type ==

Socket::SCM_RIGHTS

- ```
  return IO.new(ancdata.int)
```
- ```
end
```
- }
*/
+static VALUE
+bsock_recvmsg(int argc, VALUE *argv, VALUE sock)
+{
return bsock_recvmsg_internal(argc, argv, sock, 0);
+}

+/*

- call-seq:
- basicsocket.recvmsg_nonblock(maxdatalen=nil, flags=0,
  maxcontrollen=nil) => [data, sender_addrinfo, rflags, *controls]
- recvmsg receives a message using recvmsg(2) system call in
  non-blocking manner.
- It is similar to BasicSocket#recvmsg
- but non-blocking flag is set before the system call
- and it doesn’t retry the system call.
*/
+static VALUE
+bsock_recvmsg_nonblock(int argc, VALUE *argv, VALUE sock)
+{
return bsock_recvmsg_internal(argc, argv, sock, 1);
+}

+void
+Init_ancdata(void)
+{

rb_define_method(rb_cBasicSocket, “sendmsg”, bsock_sendmsg, -1);
rb_define_method(rb_cBasicSocket, “sendmsg_nonblock”,
bsock_sendmsg_nonblock, -1);
rb_define_method(rb_cBasicSocket, “recvmsg”, bsock_recvmsg, -1);
rb_define_method(rb_cBasicSocket, “recvmsg_nonblock”,
bsock_recvmsg_nonblock, -1);

+#if defined(HAVE_ST_MSG_CONTROL)

rb_cAncillaryData = rb_define_class_under(rb_cSocket,
“AncillaryData”, rb_cObject);
rb_define_method(rb_cAncillaryData, “initialize”,
ancillary_initialize, 3);
rb_define_method(rb_cAncillaryData, “inspect”, ancillary_inspect,
0);
rb_define_method(rb_cAncillaryData, “level”, ancillary_level_m, 0);
rb_define_method(rb_cAncillaryData, “type”, ancillary_type_m, 0);
rb_define_method(rb_cAncillaryData, “data”, ancillary_data, 0);
rb_define_method(rb_cAncillaryData, “cmsg_is?”,
ancillary_cmsg_is_p, 2);
rb_define_singleton_method(rb_cAncillaryData, “int”,
ancillary_s_int, 3);
rb_define_method(rb_cAncillaryData, “int”, ancillary_int, 0);
rb_define_singleton_method(rb_cAncillaryData, “ip_pktinfo”,
ancillary_s_ip_pktinfo, 3);
rb_define_method(rb_cAncillaryData, “ip_pktinfo”,
ancillary_ip_pktinfo, 0);
rb_define_singleton_method(rb_cAncillaryData, “ipv6_pktinfo”,
ancillary_s_ipv6_pktinfo, 2);
rb_define_method(rb_cAncillaryData, “ipv6_pktinfo”,
ancillary_ipv6_pktinfo, 0);
rb_define_method(rb_cAncillaryData, “ipv6_pktinfo_addr”,
ancillary_ipv6_pktinfo_addr, 0);
rb_define_method(rb_cAncillaryData, “ipv6_pktinfo_ifindex”,
ancillary_ipv6_pktinfo_ifindex, 0);
+#endif
+}
Index: test/socket/test_unix.rb
===================================================================
— test/socket/test_unix.rb (revision 21891)
+++ test/socket/test_unix.rb (working copy)
@@ -31,6 +31,118 @@ class TestUNIXSocket < Test::Unit::TestC
end
end
def test_fd_passing_n
io_ary = []
return if !defined?(Socket::SCM_RIGHTS)
io_ary.concat IO.pipe
io_ary.concat IO.pipe
io_ary.concat IO.pipe
send_io_ary = []
io_ary.each {|io|
```
 send_io_ary << io
```
```
 UNIXSocket.pair {|s1, s2|
```
```
   begin
```

     ret = s1.sendmsg("\0", 0, nil, [Socket::SOL_SOCKET,

Socket::SCM_RIGHTS,

                                     send_io_ary.map {|io|

io.fileno }.pack(“i!*”)])

```
   rescue NotImplementedError
```
```
     return
```
```
   end
```
```
   assert_equal(1, ret)
```
```
   ret = s2.recvmsg
```
```
   data, srcaddr, flags, *ctls = ret
```
```
   recv_io_ary = []
```
```
   ctls.each {|ctl|
```

     next if ctl.level != Socket::SOL_SOCKET || ctl.type !=

Socket::SCM_RIGHTS

     recv_io_ary.concat ctl.data.unpack("i!*").map {|fd|

IO.new(fd) }

```
   }
```

   assert_equal(send_io_ary.length, recv_io_ary.length)

```
   send_io_ary.length.times {|i|
```

     assert_not_equal(send_io_ary[i].fileno,

recv_io_ary[i].fileno)

     assert(File.identical?(send_io_ary[i], recv_io_ary[i]))

```
   }
```
```
 }
```
}
ensure
io_ary.each {|io| io.close if !io.closed? }
end
def test_sendmsg
return if !defined?(Socket::SCM_RIGHTS)
IO.pipe {|r1, w|
```
 UNIXSocket.pair {|s1, s2|
```
```
   begin
```

     ret = s1.sendmsg("\0", 0, nil, [Socket::SOL_SOCKET,

Socket::SCM_RIGHTS, [r1.fileno].pack(“i!”)])

```
   rescue NotImplementedError
```
```
     return
```
```
   end
```
```
   assert_equal(1, ret)
```
```
   r2 = s2.recv_io
```
```
   begin
```
```
     assert(File.identical?(r1, r2))
```
```
   ensure
```
```
     r2.close
```
```
   end
```
```
 }
```
}
end
def test_sendmsg_ancillarydata
return if !defined?(Socket::SCM_RIGHTS)
return if !defined?(Socket::AncillaryData)
IO.pipe {|r1, w|
```
 UNIXSocket.pair {|s1, s2|
```
```
   begin
```

     ad = Socket::AncillaryData.int(:SOCKET, :RIGHTS, r1.fileno)

     ret = s1.sendmsg("\0", 0, nil, ad)

```
   rescue NotImplementedError
```
```
     return
```
```
   end
```
```
   assert_equal(1, ret)
```
```
   r2 = s2.recv_io
```
```
   begin
```
```
     assert(File.identical?(r1, r2))
```
```
   ensure
```
```
     r2.close
```
```
   end
```
```
 }
```
}
end
def test_recvmsg
return if !defined?(Socket::SCM_RIGHTS)
IO.pipe {|r1, w|
```
 UNIXSocket.pair {|s1, s2|
```
```
   s1.send_io(r1)
```
```
   ret = s2.recvmsg
```
```
   data, srcaddr, flags, *ctls = ret
```
```
   assert_equal("\0", data)
```
if flags == nil
struct msghdr is 4.3BSD style (msg_accrights field).
assert_instance_of(Array, ctls)
assert_equal(0, ctls.length)
else
struct msghdr is POSIX/4.4BSD style (msg_control field).
assert_equal(0, flags & (Socket::MSG_TRUNC|Socket::MSG_CTRUNC))
assert_instance_of(AddrInfo, srcaddr)
assert_instance_of(Array, ctls)
assert_equal(1, ctls.length)
assert_instance_of(Socket::AncillaryData, ctls[0])
assert_equal(Socket::SOL_SOCKET, ctls[0].level)
assert_equal(Socket::SCM_RIGHTS, ctls[0].type)
assert_instance_of(String, ctls[0].data)
fd, rest = ctls[0].data.unpack(“i!a*”)
assert_equal("", rest)
r2 = IO.new(fd)
begin
```
 assert(File.identical?(r1, r2))
```
ensure
```
 r2.close
```
end
end
```
 }
```
}
end
def bound_unix_socket(klass)
tmpfile = Tempfile.new(“testrubysock”)
path = tmpfile.path

Sendmsg/recvmsg

% svn diff --diff-cmd diff -x ‘-u -p’ Index: ext/.document

— ext/.document (revision 21891) +++ ext/.document (working copy) @@ -20,6 +20,7 @@ socket/udpsocket.c socket/unixsocket.c socket/unixserver.c socket/socket.c +socket/ancdata.c socket/constants.c socket/lib/socket.rb stringio/stringio.c Index: ext/socket/rubysocket.h

Index: ext/socket/init.c

static void sock_define_const(const char *name, int value, VALUE mConst) { Index: ext/socket/depend

getnameinfo.o: getnameinfo.c $(arch_hdrdir)/ruby/config.h addrinfo.h sockport.h Index: ext/socket/mkconstants.rb

SOMAXCONN + +SCM_RIGHTS +SCM_CREDENTIALS Index: ext/socket/extconf.rb

Index: ext/socket/ancdata.c

use Socket::AncillaryData.

use 3-element array.

struct msghdr is 4.3BSD style (msg_accrights field).

struct msghdr is POSIX/4.4BSD style (msg_control field).

% svn diff --diff-cmd diff -x ‘-u -p’
Index: ext/.document

— ext/.document (revision 21891)
+++ ext/.document (working copy)
@@ -20,6 +20,7 @@ socket/udpsocket.c
socket/unixsocket.c
socket/unixserver.c
socket/socket.c
+socket/ancdata.c
socket/constants.c
socket/lib/socket.rb
stringio/stringio.c
Index: ext/socket/rubysocket.h

static void
sock_define_const(const char *name, int value, VALUE mConst)
{
Index: ext/socket/depend

getnameinfo.o: getnameinfo.c $(arch_hdrdir)/ruby/config.h addrinfo.h
sockport.h
Index: ext/socket/mkconstants.rb

SOMAXCONN
+
+SCM_RIGHTS
+SCM_CREDENTIALS
Index: ext/socket/extconf.rb