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ruby--ruby/ext/socket/socket.c
Samuel Williams 0e3b0fcdba
Thread scheduler for light weight concurrency.
2020-05-14 22:10:55 +12:00

2061 lines
64 KiB
C
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/************************************************
socket.c -
created at: Thu Mar 31 12:21:29 JST 1994
Copyright (C) 1993-2007 Yukihiro Matsumoto
************************************************/
#include "rubysocket.h"
static VALUE sym_wait_writable;
static VALUE sock_s_unpack_sockaddr_in(VALUE, VALUE);
void
rsock_sys_fail_host_port(const char *mesg, VALUE host, VALUE port)
{
rsock_syserr_fail_host_port(errno, mesg, host, port);
}
void
rsock_syserr_fail_host_port(int err, const char *mesg, VALUE host, VALUE port)
{
VALUE message;
message = rb_sprintf("%s for %+"PRIsVALUE" port % "PRIsVALUE"",
mesg, host, port);
rb_syserr_fail_str(err, message);
}
void
rsock_sys_fail_path(const char *mesg, VALUE path)
{
rsock_syserr_fail_path(errno, mesg, path);
}
void
rsock_syserr_fail_path(int err, const char *mesg, VALUE path)
{
VALUE message;
if (RB_TYPE_P(path, T_STRING)) {
message = rb_sprintf("%s for % "PRIsVALUE"", mesg, path);
rb_syserr_fail_str(err, message);
}
else {
rb_syserr_fail(err, mesg);
}
}
void
rsock_sys_fail_sockaddr(const char *mesg, struct sockaddr *addr, socklen_t len)
{
rsock_syserr_fail_sockaddr(errno, mesg, addr, len);
}
void
rsock_syserr_fail_sockaddr(int err, const char *mesg, struct sockaddr *addr, socklen_t len)
{
VALUE rai;
rai = rsock_addrinfo_new(addr, len, PF_UNSPEC, 0, 0, Qnil, Qnil);
rsock_syserr_fail_raddrinfo(err, mesg, rai);
}
void
rsock_sys_fail_raddrinfo(const char *mesg, VALUE rai)
{
rsock_syserr_fail_raddrinfo(errno, mesg, rai);
}
void
rsock_syserr_fail_raddrinfo(int err, const char *mesg, VALUE rai)
{
VALUE str, message;
str = rsock_addrinfo_inspect_sockaddr(rai);
message = rb_sprintf("%s for %"PRIsVALUE"", mesg, str);
rb_syserr_fail_str(err, message);
}
void
rsock_sys_fail_raddrinfo_or_sockaddr(const char *mesg, VALUE addr, VALUE rai)
{
rsock_syserr_fail_raddrinfo_or_sockaddr(errno, mesg, addr, rai);
}
void
rsock_syserr_fail_raddrinfo_or_sockaddr(int err, const char *mesg, VALUE addr, VALUE rai)
{
if (NIL_P(rai)) {
StringValue(addr);
rsock_syserr_fail_sockaddr(err, mesg,
(struct sockaddr *)RSTRING_PTR(addr),
(socklen_t)RSTRING_LEN(addr)); /* overflow should be checked already */
}
else
rsock_syserr_fail_raddrinfo(err, mesg, rai);
}
static void
setup_domain_and_type(VALUE domain, int *dv, VALUE type, int *tv)
{
*dv = rsock_family_arg(domain);
*tv = rsock_socktype_arg(type);
}
/*
* call-seq:
* Socket.new(domain, socktype [, protocol]) => socket
*
* Creates a new socket object.
*
* _domain_ should be a communications domain such as: :INET, :INET6, :UNIX, etc.
*
* _socktype_ should be a socket type such as: :STREAM, :DGRAM, :RAW, etc.
*
* _protocol_ is optional and should be a protocol defined in the domain.
* If protocol is not given, 0 is used internally.
*
* Socket.new(:INET, :STREAM) # TCP socket
* Socket.new(:INET, :DGRAM) # UDP socket
* Socket.new(:UNIX, :STREAM) # UNIX stream socket
* Socket.new(:UNIX, :DGRAM) # UNIX datagram socket
*/
static VALUE
sock_initialize(int argc, VALUE *argv, VALUE sock)
{
VALUE domain, type, protocol;
int fd;
int d, t;
rb_scan_args(argc, argv, "21", &domain, &type, &protocol);
if (NIL_P(protocol))
protocol = INT2FIX(0);
setup_domain_and_type(domain, &d, type, &t);
fd = rsock_socket(d, t, NUM2INT(protocol));
if (fd < 0) rb_sys_fail("socket(2)");
return rsock_init_sock(sock, fd);
}
#if defined HAVE_SOCKETPAIR
static VALUE
io_call_close(VALUE io)
{
return rb_funcallv(io, rb_intern("close"), 0, 0);
}
static VALUE
io_close(VALUE io)
{
return rb_rescue(io_call_close, io, 0, 0);
}
static VALUE
pair_yield(VALUE pair)
{
return rb_ensure(rb_yield, pair, io_close, rb_ary_entry(pair, 1));
}
#endif
#if defined HAVE_SOCKETPAIR
static int
rsock_socketpair0(int domain, int type, int protocol, int descriptors[2])
{
#ifdef SOCK_CLOEXEC
type |= SOCK_CLOEXEC;
#endif
#ifdef SOCK_NONBLOCK
type |= SOCK_NONBLOCK;
#endif
int result = socketpair(domain, type, protocol, descriptors);
if (result == -1)
return -1;
#ifndef SOCK_CLOEXEC
rb_fd_fix_cloexec(descriptors[0]);
rb_fd_fix_cloexec(descriptors[1]);
#endif
#ifndef SOCK_NONBLOCK
rsock_make_fd_nonblock(descriptors[0]);
rsock_make_fd_nonblock(descriptors[1]);
#endif
return result;
}
static int
rsock_socketpair(int domain, int type, int protocol, int descriptors[2])
{
int result;
result = rsock_socketpair0(domain, type, protocol, descriptors);
if (result < 0 && rb_gc_for_fd(errno)) {
result = rsock_socketpair0(domain, type, protocol, descriptors);
}
return result;
}
/*
* call-seq:
* Socket.pair(domain, type, protocol) => [socket1, socket2]
* Socket.socketpair(domain, type, protocol) => [socket1, socket2]
*
* Creates a pair of sockets connected each other.
*
* _domain_ should be a communications domain such as: :INET, :INET6, :UNIX, etc.
*
* _socktype_ should be a socket type such as: :STREAM, :DGRAM, :RAW, etc.
*
* _protocol_ should be a protocol defined in the domain,
* defaults to 0 for the domain.
*
* s1, s2 = Socket.pair(:UNIX, :STREAM, 0)
* s1.send "a", 0
* s1.send "b", 0
* s1.close
* p s2.recv(10) #=> "ab"
* p s2.recv(10) #=> ""
* p s2.recv(10) #=> ""
*
* s1, s2 = Socket.pair(:UNIX, :DGRAM, 0)
* s1.send "a", 0
* s1.send "b", 0
* p s2.recv(10) #=> "a"
* p s2.recv(10) #=> "b"
*
*/
VALUE
rsock_sock_s_socketpair(int argc, VALUE *argv, VALUE klass)
{
VALUE domain, type, protocol;
int d, t, p, sp[2];
int ret;
VALUE s1, s2, r;
rb_scan_args(argc, argv, "21", &domain, &type, &protocol);
if (NIL_P(protocol))
protocol = INT2FIX(0);
setup_domain_and_type(domain, &d, type, &t);
p = NUM2INT(protocol);
ret = rsock_socketpair(d, t, p, sp);
if (ret < 0) {
rb_sys_fail("socketpair(2)");
}
s1 = rsock_init_sock(rb_obj_alloc(klass), sp[0]);
s2 = rsock_init_sock(rb_obj_alloc(klass), sp[1]);
r = rb_assoc_new(s1, s2);
if (rb_block_given_p()) {
return rb_ensure(pair_yield, r, io_close, s1);
}
return r;
}
#else
#define rsock_sock_s_socketpair rb_f_notimplement
#endif
/*
* call-seq:
* socket.connect(remote_sockaddr) => 0
*
* Requests a connection to be made on the given +remote_sockaddr+. Returns 0 if
* successful, otherwise an exception is raised.
*
* === Parameter
* * +remote_sockaddr+ - the +struct+ sockaddr contained in a string or Addrinfo object
*
* === Example:
* # Pull down Google's web page
* require 'socket'
* include Socket::Constants
* socket = Socket.new( AF_INET, SOCK_STREAM, 0 )
* sockaddr = Socket.pack_sockaddr_in( 80, 'www.google.com' )
* socket.connect( sockaddr )
* socket.write( "GET / HTTP/1.0\r\n\r\n" )
* results = socket.read
*
* === Unix-based Exceptions
* On unix-based systems the following system exceptions may be raised if
* the call to _connect_ fails:
* * Errno::EACCES - search permission is denied for a component of the prefix
* path or write access to the +socket+ is denied
* * Errno::EADDRINUSE - the _sockaddr_ is already in use
* * Errno::EADDRNOTAVAIL - the specified _sockaddr_ is not available from the
* local machine
* * Errno::EAFNOSUPPORT - the specified _sockaddr_ is not a valid address for
* the address family of the specified +socket+
* * Errno::EALREADY - a connection is already in progress for the specified
* socket
* * Errno::EBADF - the +socket+ is not a valid file descriptor
* * Errno::ECONNREFUSED - the target _sockaddr_ was not listening for connections
* refused the connection request
* * Errno::ECONNRESET - the remote host reset the connection request
* * Errno::EFAULT - the _sockaddr_ cannot be accessed
* * Errno::EHOSTUNREACH - the destination host cannot be reached (probably
* because the host is down or a remote router cannot reach it)
* * Errno::EINPROGRESS - the O_NONBLOCK is set for the +socket+ and the
* connection cannot be immediately established; the connection will be
* established asynchronously
* * Errno::EINTR - the attempt to establish the connection was interrupted by
* delivery of a signal that was caught; the connection will be established
* asynchronously
* * Errno::EISCONN - the specified +socket+ is already connected
* * Errno::EINVAL - the address length used for the _sockaddr_ is not a valid
* length for the address family or there is an invalid family in _sockaddr_
* * Errno::ENAMETOOLONG - the pathname resolved had a length which exceeded
* PATH_MAX
* * Errno::ENETDOWN - the local interface used to reach the destination is down
* * Errno::ENETUNREACH - no route to the network is present
* * Errno::ENOBUFS - no buffer space is available
* * Errno::ENOSR - there were insufficient STREAMS resources available to
* complete the operation
* * Errno::ENOTSOCK - the +socket+ argument does not refer to a socket
* * Errno::EOPNOTSUPP - the calling +socket+ is listening and cannot be connected
* * Errno::EPROTOTYPE - the _sockaddr_ has a different type than the socket
* bound to the specified peer address
* * Errno::ETIMEDOUT - the attempt to connect time out before a connection
* was made.
*
* On unix-based systems if the address family of the calling +socket+ is
* AF_UNIX the follow exceptions may be raised if the call to _connect_
* fails:
* * Errno::EIO - an i/o error occurred while reading from or writing to the
* file system
* * Errno::ELOOP - too many symbolic links were encountered in translating
* the pathname in _sockaddr_
* * Errno::ENAMETOOLLONG - a component of a pathname exceeded NAME_MAX
* characters, or an entire pathname exceeded PATH_MAX characters
* * Errno::ENOENT - a component of the pathname does not name an existing file
* or the pathname is an empty string
* * Errno::ENOTDIR - a component of the path prefix of the pathname in _sockaddr_
* is not a directory
*
* === Windows Exceptions
* On Windows systems the following system exceptions may be raised if
* the call to _connect_ fails:
* * Errno::ENETDOWN - the network is down
* * Errno::EADDRINUSE - the socket's local address is already in use
* * Errno::EINTR - the socket was cancelled
* * Errno::EINPROGRESS - a blocking socket is in progress or the service provider
* is still processing a callback function. Or a nonblocking connect call is
* in progress on the +socket+.
* * Errno::EALREADY - see Errno::EINVAL
* * Errno::EADDRNOTAVAIL - the remote address is not a valid address, such as
* ADDR_ANY TODO check ADDRANY TO INADDR_ANY
* * Errno::EAFNOSUPPORT - addresses in the specified family cannot be used with
* with this +socket+
* * Errno::ECONNREFUSED - the target _sockaddr_ was not listening for connections
* refused the connection request
* * Errno::EFAULT - the socket's internal address or address length parameter
* is too small or is not a valid part of the user space address
* * Errno::EINVAL - the +socket+ is a listening socket
* * Errno::EISCONN - the +socket+ is already connected
* * Errno::ENETUNREACH - the network cannot be reached from this host at this time
* * Errno::EHOSTUNREACH - no route to the network is present
* * Errno::ENOBUFS - no buffer space is available
* * Errno::ENOTSOCK - the +socket+ argument does not refer to a socket
* * Errno::ETIMEDOUT - the attempt to connect time out before a connection
* was made.
* * Errno::EWOULDBLOCK - the socket is marked as nonblocking and the
* connection cannot be completed immediately
* * Errno::EACCES - the attempt to connect the datagram socket to the
* broadcast address failed
*
* === See
* * connect manual pages on unix-based systems
* * connect function in Microsoft's Winsock functions reference
*/
static VALUE
sock_connect(VALUE sock, VALUE addr)
{
VALUE rai;
rb_io_t *fptr;
int fd, n;
SockAddrStringValueWithAddrinfo(addr, rai);
addr = rb_str_new4(addr);
GetOpenFile(sock, fptr);
fd = fptr->fd;
n = rsock_connect(fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr), 0);
if (n < 0) {
rsock_sys_fail_raddrinfo_or_sockaddr("connect(2)", addr, rai);
}
return INT2FIX(n);
}
/* :nodoc: */
static VALUE
sock_connect_nonblock(VALUE sock, VALUE addr, VALUE ex)
{
VALUE rai;
rb_io_t *fptr;
int n;
SockAddrStringValueWithAddrinfo(addr, rai);
addr = rb_str_new4(addr);
GetOpenFile(sock, fptr);
rb_io_set_nonblock(fptr);
n = connect(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr));
if (n < 0) {
int e = errno;
if (e == EINPROGRESS) {
if (ex == Qfalse) {
return sym_wait_writable;
}
rb_readwrite_syserr_fail(RB_IO_WAIT_WRITABLE, e, "connect(2) would block");
}
if (e == EISCONN) {
if (ex == Qfalse) {
return INT2FIX(0);
}
}
rsock_syserr_fail_raddrinfo_or_sockaddr(e, "connect(2)", addr, rai);
}
return INT2FIX(n);
}
/*
* call-seq:
* socket.bind(local_sockaddr) => 0
*
* Binds to the given local address.
*
* === Parameter
* * +local_sockaddr+ - the +struct+ sockaddr contained in a string or an Addrinfo object
*
* === Example
* require 'socket'
*
* # use Addrinfo
* socket = Socket.new(:INET, :STREAM, 0)
* socket.bind(Addrinfo.tcp("127.0.0.1", 2222))
* p socket.local_address #=> #<Addrinfo: 127.0.0.1:2222 TCP>
*
* # use struct sockaddr
* include Socket::Constants
* socket = Socket.new( AF_INET, SOCK_STREAM, 0 )
* sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' )
* socket.bind( sockaddr )
*
* === Unix-based Exceptions
* On unix-based based systems the following system exceptions may be raised if
* the call to _bind_ fails:
* * Errno::EACCES - the specified _sockaddr_ is protected and the current
* user does not have permission to bind to it
* * Errno::EADDRINUSE - the specified _sockaddr_ is already in use
* * Errno::EADDRNOTAVAIL - the specified _sockaddr_ is not available from the
* local machine
* * Errno::EAFNOSUPPORT - the specified _sockaddr_ is not a valid address for
* the family of the calling +socket+
* * Errno::EBADF - the _sockaddr_ specified is not a valid file descriptor
* * Errno::EFAULT - the _sockaddr_ argument cannot be accessed
* * Errno::EINVAL - the +socket+ is already bound to an address, and the
* protocol does not support binding to the new _sockaddr_ or the +socket+
* has been shut down.
* * Errno::EINVAL - the address length is not a valid length for the address
* family
* * Errno::ENAMETOOLONG - the pathname resolved had a length which exceeded
* PATH_MAX
* * Errno::ENOBUFS - no buffer space is available
* * Errno::ENOSR - there were insufficient STREAMS resources available to
* complete the operation
* * Errno::ENOTSOCK - the +socket+ does not refer to a socket
* * Errno::EOPNOTSUPP - the socket type of the +socket+ does not support
* binding to an address
*
* On unix-based based systems if the address family of the calling +socket+ is
* Socket::AF_UNIX the follow exceptions may be raised if the call to _bind_
* fails:
* * Errno::EACCES - search permission is denied for a component of the prefix
* path or write access to the +socket+ is denied
* * Errno::EDESTADDRREQ - the _sockaddr_ argument is a null pointer
* * Errno::EISDIR - same as Errno::EDESTADDRREQ
* * Errno::EIO - an i/o error occurred
* * Errno::ELOOP - too many symbolic links were encountered in translating
* the pathname in _sockaddr_
* * Errno::ENAMETOOLLONG - a component of a pathname exceeded NAME_MAX
* characters, or an entire pathname exceeded PATH_MAX characters
* * Errno::ENOENT - a component of the pathname does not name an existing file
* or the pathname is an empty string
* * Errno::ENOTDIR - a component of the path prefix of the pathname in _sockaddr_
* is not a directory
* * Errno::EROFS - the name would reside on a read only filesystem
*
* === Windows Exceptions
* On Windows systems the following system exceptions may be raised if
* the call to _bind_ fails:
* * Errno::ENETDOWN-- the network is down
* * Errno::EACCES - the attempt to connect the datagram socket to the
* broadcast address failed
* * Errno::EADDRINUSE - the socket's local address is already in use
* * Errno::EADDRNOTAVAIL - the specified address is not a valid address for this
* computer
* * Errno::EFAULT - the socket's internal address or address length parameter
* is too small or is not a valid part of the user space addressed
* * Errno::EINVAL - the +socket+ is already bound to an address
* * Errno::ENOBUFS - no buffer space is available
* * Errno::ENOTSOCK - the +socket+ argument does not refer to a socket
*
* === See
* * bind manual pages on unix-based systems
* * bind function in Microsoft's Winsock functions reference
*/
static VALUE
sock_bind(VALUE sock, VALUE addr)
{
VALUE rai;
rb_io_t *fptr;
SockAddrStringValueWithAddrinfo(addr, rai);
GetOpenFile(sock, fptr);
if (bind(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr)) < 0)
rsock_sys_fail_raddrinfo_or_sockaddr("bind(2)", addr, rai);
return INT2FIX(0);
}
/*
* call-seq:
* socket.listen( int ) => 0
*
* Listens for connections, using the specified +int+ as the backlog. A call
* to _listen_ only applies if the +socket+ is of type SOCK_STREAM or
* SOCK_SEQPACKET.
*
* === Parameter
* * +backlog+ - the maximum length of the queue for pending connections.
*
* === Example 1
* require 'socket'
* include Socket::Constants
* socket = Socket.new( AF_INET, SOCK_STREAM, 0 )
* sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' )
* socket.bind( sockaddr )
* socket.listen( 5 )
*
* === Example 2 (listening on an arbitrary port, unix-based systems only):
* require 'socket'
* include Socket::Constants
* socket = Socket.new( AF_INET, SOCK_STREAM, 0 )
* socket.listen( 1 )
*
* === Unix-based Exceptions
* On unix based systems the above will work because a new +sockaddr+ struct
* is created on the address ADDR_ANY, for an arbitrary port number as handed
* off by the kernel. It will not work on Windows, because Windows requires that
* the +socket+ is bound by calling _bind_ before it can _listen_.
*
* If the _backlog_ amount exceeds the implementation-dependent maximum
* queue length, the implementation's maximum queue length will be used.
*
* On unix-based based systems the following system exceptions may be raised if the
* call to _listen_ fails:
* * Errno::EBADF - the _socket_ argument is not a valid file descriptor
* * Errno::EDESTADDRREQ - the _socket_ is not bound to a local address, and
* the protocol does not support listening on an unbound socket
* * Errno::EINVAL - the _socket_ is already connected
* * Errno::ENOTSOCK - the _socket_ argument does not refer to a socket
* * Errno::EOPNOTSUPP - the _socket_ protocol does not support listen
* * Errno::EACCES - the calling process does not have appropriate privileges
* * Errno::EINVAL - the _socket_ has been shut down
* * Errno::ENOBUFS - insufficient resources are available in the system to
* complete the call
*
* === Windows Exceptions
* On Windows systems the following system exceptions may be raised if
* the call to _listen_ fails:
* * Errno::ENETDOWN - the network is down
* * Errno::EADDRINUSE - the socket's local address is already in use. This
* usually occurs during the execution of _bind_ but could be delayed
* if the call to _bind_ was to a partially wildcard address (involving
* ADDR_ANY) and if a specific address needs to be committed at the
* time of the call to _listen_
* * Errno::EINPROGRESS - a Windows Sockets 1.1 call is in progress or the
* service provider is still processing a callback function
* * Errno::EINVAL - the +socket+ has not been bound with a call to _bind_.
* * Errno::EISCONN - the +socket+ is already connected
* * Errno::EMFILE - no more socket descriptors are available
* * Errno::ENOBUFS - no buffer space is available
* * Errno::ENOTSOC - +socket+ is not a socket
* * Errno::EOPNOTSUPP - the referenced +socket+ is not a type that supports
* the _listen_ method
*
* === See
* * listen manual pages on unix-based systems
* * listen function in Microsoft's Winsock functions reference
*/
VALUE
rsock_sock_listen(VALUE sock, VALUE log)
{
rb_io_t *fptr;
int backlog;
backlog = NUM2INT(log);
GetOpenFile(sock, fptr);
if (listen(fptr->fd, backlog) < 0)
rb_sys_fail("listen(2)");
return INT2FIX(0);
}
/*
* call-seq:
* socket.recvfrom(maxlen) => [mesg, sender_addrinfo]
* socket.recvfrom(maxlen, flags) => [mesg, sender_addrinfo]
*
* Receives up to _maxlen_ bytes from +socket+. _flags_ is zero or more
* of the +MSG_+ options. The first element of the results, _mesg_, is the data
* received. The second element, _sender_addrinfo_, contains protocol-specific
* address information of the sender.
*
* === Parameters
* * +maxlen+ - the maximum number of bytes to receive from the socket
* * +flags+ - zero or more of the +MSG_+ options
*
* === Example
* # In one file, start this first
* require 'socket'
* include Socket::Constants
* socket = Socket.new( AF_INET, SOCK_STREAM, 0 )
* sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' )
* socket.bind( sockaddr )
* socket.listen( 5 )
* client, client_addrinfo = socket.accept
* data = client.recvfrom( 20 )[0].chomp
* puts "I only received 20 bytes '#{data}'"
* sleep 1
* socket.close
*
* # In another file, start this second
* require 'socket'
* include Socket::Constants
* socket = Socket.new( AF_INET, SOCK_STREAM, 0 )
* sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' )
* socket.connect( sockaddr )
* socket.puts "Watch this get cut short!"
* socket.close
*
* === Unix-based Exceptions
* On unix-based based systems the following system exceptions may be raised if the
* call to _recvfrom_ fails:
* * Errno::EAGAIN - the +socket+ file descriptor is marked as O_NONBLOCK and no
* data is waiting to be received; or MSG_OOB is set and no out-of-band data
* is available and either the +socket+ file descriptor is marked as
* O_NONBLOCK or the +socket+ does not support blocking to wait for
* out-of-band-data
* * Errno::EWOULDBLOCK - see Errno::EAGAIN
* * Errno::EBADF - the +socket+ is not a valid file descriptor
* * Errno::ECONNRESET - a connection was forcibly closed by a peer
* * Errno::EFAULT - the socket's internal buffer, address or address length
* cannot be accessed or written
* * Errno::EINTR - a signal interrupted _recvfrom_ before any data was available
* * Errno::EINVAL - the MSG_OOB flag is set and no out-of-band data is available
* * Errno::EIO - an i/o error occurred while reading from or writing to the
* filesystem
* * Errno::ENOBUFS - insufficient resources were available in the system to
* perform the operation
* * Errno::ENOMEM - insufficient memory was available to fulfill the request
* * Errno::ENOSR - there were insufficient STREAMS resources available to
* complete the operation
* * Errno::ENOTCONN - a receive is attempted on a connection-mode socket that
* is not connected
* * Errno::ENOTSOCK - the +socket+ does not refer to a socket
* * Errno::EOPNOTSUPP - the specified flags are not supported for this socket type
* * Errno::ETIMEDOUT - the connection timed out during connection establishment
* or due to a transmission timeout on an active connection
*
* === Windows Exceptions
* On Windows systems the following system exceptions may be raised if
* the call to _recvfrom_ fails:
* * Errno::ENETDOWN - the network is down
* * Errno::EFAULT - the internal buffer and from parameters on +socket+ are not
* part of the user address space, or the internal fromlen parameter is
* too small to accommodate the peer address
* * Errno::EINTR - the (blocking) call was cancelled by an internal call to
* the WinSock function WSACancelBlockingCall
* * Errno::EINPROGRESS - a blocking Windows Sockets 1.1 call is in progress or
* the service provider is still processing a callback function
* * Errno::EINVAL - +socket+ has not been bound with a call to _bind_, or an
* unknown flag was specified, or MSG_OOB was specified for a socket with
* SO_OOBINLINE enabled, or (for byte stream-style sockets only) the internal
* len parameter on +socket+ was zero or negative
* * Errno::EISCONN - +socket+ is already connected. The call to _recvfrom_ is
* not permitted with a connected socket on a socket that is connection
* oriented or connectionless.
* * Errno::ENETRESET - the connection has been broken due to the keep-alive
* activity detecting a failure while the operation was in progress.
* * Errno::EOPNOTSUPP - MSG_OOB was specified, but +socket+ is not stream-style
* such as type SOCK_STREAM. OOB data is not supported in the communication
* domain associated with +socket+, or +socket+ is unidirectional and
* supports only send operations
* * Errno::ESHUTDOWN - +socket+ has been shutdown. It is not possible to
* call _recvfrom_ on a socket after _shutdown_ has been invoked.
* * Errno::EWOULDBLOCK - +socket+ is marked as nonblocking and a call to
* _recvfrom_ would block.
* * Errno::EMSGSIZE - the message was too large to fit into the specified buffer
* and was truncated.
* * Errno::ETIMEDOUT - the connection has been dropped, because of a network
* failure or because the system on the other end went down without
* notice
* * Errno::ECONNRESET - the virtual circuit was reset by the remote side
* executing a hard or abortive close. The application should close the
* socket; it is no longer usable. On a UDP-datagram socket this error
* indicates a previous send operation resulted in an ICMP Port Unreachable
* message.
*/
static VALUE
sock_recvfrom(int argc, VALUE *argv, VALUE sock)
{
return rsock_s_recvfrom(sock, argc, argv, RECV_SOCKET);
}
/* :nodoc: */
static VALUE
sock_recvfrom_nonblock(VALUE sock, VALUE len, VALUE flg, VALUE str, VALUE ex)
{
return rsock_s_recvfrom_nonblock(sock, len, flg, str, ex, RECV_SOCKET);
}
/*
* call-seq:
* socket.accept => [client_socket, client_addrinfo]
*
* Accepts a next connection.
* Returns a new Socket object and Addrinfo object.
*
* serv = Socket.new(:INET, :STREAM, 0)
* serv.listen(5)
* c = Socket.new(:INET, :STREAM, 0)
* c.connect(serv.connect_address)
* p serv.accept #=> [#<Socket:fd 6>, #<Addrinfo: 127.0.0.1:48555 TCP>]
*
*/
static VALUE
sock_accept(VALUE sock)
{
rb_io_t *fptr;
VALUE sock2;
union_sockaddr buf;
socklen_t len = (socklen_t)sizeof buf;
GetOpenFile(sock, fptr);
sock2 = rsock_s_accept(rb_cSocket,fptr->fd,&buf.addr,&len);
return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len));
}
/* :nodoc: */
static VALUE
sock_accept_nonblock(VALUE sock, VALUE ex)
{
rb_io_t *fptr;
VALUE sock2;
union_sockaddr buf;
struct sockaddr *addr = &buf.addr;
socklen_t len = (socklen_t)sizeof buf;
GetOpenFile(sock, fptr);
sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len);
if (SYMBOL_P(sock2)) /* :wait_readable */
return sock2;
return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len));
}
/*
* call-seq:
* socket.sysaccept => [client_socket_fd, client_addrinfo]
*
* Accepts an incoming connection returning an array containing the (integer)
* file descriptor for the incoming connection, _client_socket_fd_,
* and an Addrinfo, _client_addrinfo_.
*
* === Example
* # In one script, start this first
* require 'socket'
* include Socket::Constants
* socket = Socket.new( AF_INET, SOCK_STREAM, 0 )
* sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' )
* socket.bind( sockaddr )
* socket.listen( 5 )
* client_fd, client_addrinfo = socket.sysaccept
* client_socket = Socket.for_fd( client_fd )
* puts "The client said, '#{client_socket.readline.chomp}'"
* client_socket.puts "Hello from script one!"
* socket.close
*
* # In another script, start this second
* require 'socket'
* include Socket::Constants
* socket = Socket.new( AF_INET, SOCK_STREAM, 0 )
* sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' )
* socket.connect( sockaddr )
* socket.puts "Hello from script 2."
* puts "The server said, '#{socket.readline.chomp}'"
* socket.close
*
* Refer to Socket#accept for the exceptions that may be thrown if the call
* to _sysaccept_ fails.
*
* === See
* * Socket#accept
*/
static VALUE
sock_sysaccept(VALUE sock)
{
rb_io_t *fptr;
VALUE sock2;
union_sockaddr buf;
socklen_t len = (socklen_t)sizeof buf;
GetOpenFile(sock, fptr);
sock2 = rsock_s_accept(0,fptr->fd,&buf.addr,&len);
return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len));
}
#ifdef HAVE_GETHOSTNAME
/*
* call-seq:
* Socket.gethostname => hostname
*
* Returns the hostname.
*
* p Socket.gethostname #=> "hal"
*
* Note that it is not guaranteed to be able to convert to IP address using gethostbyname, getaddrinfo, etc.
* If you need local IP address, use Socket.ip_address_list.
*/
static VALUE
sock_gethostname(VALUE obj)
{
#if defined(NI_MAXHOST)
# define RUBY_MAX_HOST_NAME_LEN NI_MAXHOST
#elif defined(HOST_NAME_MAX)
# define RUBY_MAX_HOST_NAME_LEN HOST_NAME_MAX
#else
# define RUBY_MAX_HOST_NAME_LEN 1024
#endif
long len = RUBY_MAX_HOST_NAME_LEN;
VALUE name;
name = rb_str_new(0, len);
while (gethostname(RSTRING_PTR(name), len) < 0) {
int e = errno;
switch (e) {
case ENAMETOOLONG:
#ifdef __linux__
case EINVAL:
/* glibc before version 2.1 uses EINVAL instead of ENAMETOOLONG */
#endif
break;
default:
rb_syserr_fail(e, "gethostname(3)");
}
rb_str_modify_expand(name, len);
len += len;
}
rb_str_resize(name, strlen(RSTRING_PTR(name)));
return name;
}
#else
#ifdef HAVE_UNAME
#include <sys/utsname.h>
static VALUE
sock_gethostname(VALUE obj)
{
struct utsname un;
uname(&un);
return rb_str_new2(un.nodename);
}
#else
#define sock_gethostname rb_f_notimplement
#endif
#endif
static VALUE
make_addrinfo(struct rb_addrinfo *res0, int norevlookup)
{
VALUE base, ary;
struct addrinfo *res;
if (res0 == NULL) {
rb_raise(rb_eSocket, "host not found");
}
base = rb_ary_new();
for (res = res0->ai; res; res = res->ai_next) {
ary = rsock_ipaddr(res->ai_addr, res->ai_addrlen, norevlookup);
if (res->ai_canonname) {
RARRAY_ASET(ary, 2, rb_str_new2(res->ai_canonname));
}
rb_ary_push(ary, INT2FIX(res->ai_family));
rb_ary_push(ary, INT2FIX(res->ai_socktype));
rb_ary_push(ary, INT2FIX(res->ai_protocol));
rb_ary_push(base, ary);
}
return base;
}
static VALUE
sock_sockaddr(struct sockaddr *addr, socklen_t len)
{
char *ptr;
switch (addr->sa_family) {
case AF_INET:
ptr = (char*)&((struct sockaddr_in*)addr)->sin_addr.s_addr;
len = (socklen_t)sizeof(((struct sockaddr_in*)addr)->sin_addr.s_addr);
break;
#ifdef AF_INET6
case AF_INET6:
ptr = (char*)&((struct sockaddr_in6*)addr)->sin6_addr.s6_addr;
len = (socklen_t)sizeof(((struct sockaddr_in6*)addr)->sin6_addr.s6_addr);
break;
#endif
default:
rb_raise(rb_eSocket, "unknown socket family:%d", addr->sa_family);
break;
}
return rb_str_new(ptr, len);
}
/*
* call-seq:
* Socket.gethostbyname(hostname) => [official_hostname, alias_hostnames, address_family, *address_list]
*
* Use Addrinfo.getaddrinfo instead.
* This method is deprecated for the following reasons:
*
* - The 3rd element of the result is the address family of the first address.
* The address families of the rest of the addresses are not returned.
* - Uncommon address representation:
* 4/16-bytes binary string to represent IPv4/IPv6 address.
* - gethostbyname() may take a long time and it may block other threads.
* (GVL cannot be released since gethostbyname() is not thread safe.)
* - This method uses gethostbyname() function already removed from POSIX.
*
* This method obtains the host information for _hostname_.
*
* p Socket.gethostbyname("hal") #=> ["localhost", ["hal"], 2, "\x7F\x00\x00\x01"]
*
*/
static VALUE
sock_s_gethostbyname(VALUE obj, VALUE host)
{
struct rb_addrinfo *res =
rsock_addrinfo(host, Qnil, AF_UNSPEC, SOCK_STREAM, AI_CANONNAME);
return rsock_make_hostent(host, res, sock_sockaddr);
}
/*
* call-seq:
* Socket.gethostbyaddr(address_string [, address_family]) => hostent
*
* Use Addrinfo#getnameinfo instead.
* This method is deprecated for the following reasons:
*
* - Uncommon address representation:
* 4/16-bytes binary string to represent IPv4/IPv6 address.
* - gethostbyaddr() may take a long time and it may block other threads.
* (GVL cannot be released since gethostbyname() is not thread safe.)
* - This method uses gethostbyname() function already removed from POSIX.
*
* This method obtains the host information for _address_.
*
* p Socket.gethostbyaddr([221,186,184,68].pack("CCCC"))
* #=> ["carbon.ruby-lang.org", [], 2, "\xDD\xBA\xB8D"]
*
* p Socket.gethostbyaddr([127,0,0,1].pack("CCCC"))
* ["localhost", [], 2, "\x7F\x00\x00\x01"]
* p Socket.gethostbyaddr(([0]*15+[1]).pack("C"*16))
* #=> ["localhost", ["ip6-localhost", "ip6-loopback"], 10,
* "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"]
*
*/
static VALUE
sock_s_gethostbyaddr(int argc, VALUE *argv, VALUE _)
{
VALUE addr, family;
struct hostent *h;
char **pch;
VALUE ary, names;
int t = AF_INET;
rb_scan_args(argc, argv, "11", &addr, &family);
StringValue(addr);
if (!NIL_P(family)) {
t = rsock_family_arg(family);
}
#ifdef AF_INET6
else if (RSTRING_LEN(addr) == 16) {
t = AF_INET6;
}
#endif
h = gethostbyaddr(RSTRING_PTR(addr), RSTRING_SOCKLEN(addr), t);
if (h == NULL) {
#ifdef HAVE_HSTRERROR
extern int h_errno;
rb_raise(rb_eSocket, "%s", (char*)hstrerror(h_errno));
#else
rb_raise(rb_eSocket, "host not found");
#endif
}
ary = rb_ary_new();
rb_ary_push(ary, rb_str_new2(h->h_name));
names = rb_ary_new();
rb_ary_push(ary, names);
if (h->h_aliases != NULL) {
for (pch = h->h_aliases; *pch; pch++) {
rb_ary_push(names, rb_str_new2(*pch));
}
}
rb_ary_push(ary, INT2NUM(h->h_addrtype));
#ifdef h_addr
for (pch = h->h_addr_list; *pch; pch++) {
rb_ary_push(ary, rb_str_new(*pch, h->h_length));
}
#else
rb_ary_push(ary, rb_str_new(h->h_addr, h->h_length));
#endif
return ary;
}
/*
* call-seq:
* Socket.getservbyname(service_name) => port_number
* Socket.getservbyname(service_name, protocol_name) => port_number
*
* Obtains the port number for _service_name_.
*
* If _protocol_name_ is not given, "tcp" is assumed.
*
* Socket.getservbyname("smtp") #=> 25
* Socket.getservbyname("shell") #=> 514
* Socket.getservbyname("syslog", "udp") #=> 514
*/
static VALUE
sock_s_getservbyname(int argc, VALUE *argv, VALUE _)
{
VALUE service, proto;
struct servent *sp;
long port;
const char *servicename, *protoname = "tcp";
rb_scan_args(argc, argv, "11", &service, &proto);
StringValue(service);
if (!NIL_P(proto)) StringValue(proto);
servicename = StringValueCStr(service);
if (!NIL_P(proto)) protoname = StringValueCStr(proto);
sp = getservbyname(servicename, protoname);
if (sp) {
port = ntohs(sp->s_port);
}
else {
char *end;
port = STRTOUL(servicename, &end, 0);
if (*end != '\0') {
rb_raise(rb_eSocket, "no such service %s/%s", servicename, protoname);
}
}
return INT2FIX(port);
}
/*
* call-seq:
* Socket.getservbyport(port [, protocol_name]) => service
*
* Obtains the port number for _port_.
*
* If _protocol_name_ is not given, "tcp" is assumed.
*
* Socket.getservbyport(80) #=> "www"
* Socket.getservbyport(514, "tcp") #=> "shell"
* Socket.getservbyport(514, "udp") #=> "syslog"
*
*/
static VALUE
sock_s_getservbyport(int argc, VALUE *argv, VALUE _)
{
VALUE port, proto;
struct servent *sp;
long portnum;
const char *protoname = "tcp";
rb_scan_args(argc, argv, "11", &port, &proto);
portnum = NUM2LONG(port);
if (portnum != (uint16_t)portnum) {
const char *s = portnum > 0 ? "big" : "small";
rb_raise(rb_eRangeError, "integer %ld too %s to convert into `int16_t'", portnum, s);
}
if (!NIL_P(proto)) protoname = StringValueCStr(proto);
sp = getservbyport((int)htons((uint16_t)portnum), protoname);
if (!sp) {
rb_raise(rb_eSocket, "no such service for port %d/%s", (int)portnum, protoname);
}
return rb_str_new2(sp->s_name);
}
/*
* call-seq:
* Socket.getaddrinfo(nodename, servname[, family[, socktype[, protocol[, flags[, reverse_lookup]]]]]) => array
*
* Obtains address information for _nodename_:_servname_.
*
* Note that Addrinfo.getaddrinfo provides the same functionality in
* an object oriented style.
*
* _family_ should be an address family such as: :INET, :INET6, etc.
*
* _socktype_ should be a socket type such as: :STREAM, :DGRAM, :RAW, etc.
*
* _protocol_ should be a protocol defined in the family,
* and defaults to 0 for the family.
*
* _flags_ should be bitwise OR of Socket::AI_* constants.
*
* Socket.getaddrinfo("www.ruby-lang.org", "http", nil, :STREAM)
* #=> [["AF_INET", 80, "carbon.ruby-lang.org", "221.186.184.68", 2, 1, 6]] # PF_INET/SOCK_STREAM/IPPROTO_TCP
*
* Socket.getaddrinfo("localhost", nil)
* #=> [["AF_INET", 0, "localhost", "127.0.0.1", 2, 1, 6], # PF_INET/SOCK_STREAM/IPPROTO_TCP
* # ["AF_INET", 0, "localhost", "127.0.0.1", 2, 2, 17], # PF_INET/SOCK_DGRAM/IPPROTO_UDP
* # ["AF_INET", 0, "localhost", "127.0.0.1", 2, 3, 0]] # PF_INET/SOCK_RAW/IPPROTO_IP
*
* _reverse_lookup_ directs the form of the third element, and has to
* be one of below. If _reverse_lookup_ is omitted, the default value is +nil+.
*
* +true+, +:hostname+: hostname is obtained from numeric address using reverse lookup, which may take a time.
* +false+, +:numeric+: hostname is same as numeric address.
* +nil+: obey to the current +do_not_reverse_lookup+ flag.
*
* If Addrinfo object is preferred, use Addrinfo.getaddrinfo.
*/
static VALUE
sock_s_getaddrinfo(int argc, VALUE *argv, VALUE _)
{
VALUE host, port, family, socktype, protocol, flags, ret, revlookup;
struct addrinfo hints;
struct rb_addrinfo *res;
int norevlookup;
rb_scan_args(argc, argv, "25", &host, &port, &family, &socktype, &protocol, &flags, &revlookup);
MEMZERO(&hints, struct addrinfo, 1);
hints.ai_family = NIL_P(family) ? PF_UNSPEC : rsock_family_arg(family);
if (!NIL_P(socktype)) {
hints.ai_socktype = rsock_socktype_arg(socktype);
}
if (!NIL_P(protocol)) {
hints.ai_protocol = NUM2INT(protocol);
}
if (!NIL_P(flags)) {
hints.ai_flags = NUM2INT(flags);
}
if (NIL_P(revlookup) || !rsock_revlookup_flag(revlookup, &norevlookup)) {
norevlookup = rsock_do_not_reverse_lookup;
}
res = rsock_getaddrinfo(host, port, &hints, 0);
ret = make_addrinfo(res, norevlookup);
rb_freeaddrinfo(res);
return ret;
}
/*
* call-seq:
* Socket.getnameinfo(sockaddr [, flags]) => [hostname, servicename]
*
* Obtains name information for _sockaddr_.
*
* _sockaddr_ should be one of follows.
* - packed sockaddr string such as Socket.sockaddr_in(80, "127.0.0.1")
* - 3-elements array such as ["AF_INET", 80, "127.0.0.1"]
* - 4-elements array such as ["AF_INET", 80, ignored, "127.0.0.1"]
*
* _flags_ should be bitwise OR of Socket::NI_* constants.
*
* Note:
* The last form is compatible with IPSocket#addr and IPSocket#peeraddr.
*
* Socket.getnameinfo(Socket.sockaddr_in(80, "127.0.0.1")) #=> ["localhost", "www"]
* Socket.getnameinfo(["AF_INET", 80, "127.0.0.1"]) #=> ["localhost", "www"]
* Socket.getnameinfo(["AF_INET", 80, "localhost", "127.0.0.1"]) #=> ["localhost", "www"]
*
* If Addrinfo object is preferred, use Addrinfo#getnameinfo.
*/
static VALUE
sock_s_getnameinfo(int argc, VALUE *argv, VALUE _)
{
VALUE sa, af = Qnil, host = Qnil, port = Qnil, flags, tmp;
char *hptr, *pptr;
char hbuf[1024], pbuf[1024];
int fl;
struct rb_addrinfo *res = NULL;
struct addrinfo hints, *r;
int error, saved_errno;
union_sockaddr ss;
struct sockaddr *sap;
socklen_t salen;
sa = flags = Qnil;
rb_scan_args(argc, argv, "11", &sa, &flags);
fl = 0;
if (!NIL_P(flags)) {
fl = NUM2INT(flags);
}
tmp = rb_check_sockaddr_string_type(sa);
if (!NIL_P(tmp)) {
sa = tmp;
if (sizeof(ss) < (size_t)RSTRING_LEN(sa)) {
rb_raise(rb_eTypeError, "sockaddr length too big");
}
memcpy(&ss, RSTRING_PTR(sa), RSTRING_LEN(sa));
if (!VALIDATE_SOCKLEN(&ss.addr, RSTRING_LEN(sa))) {
rb_raise(rb_eTypeError, "sockaddr size differs - should not happen");
}
sap = &ss.addr;
salen = RSTRING_SOCKLEN(sa);
goto call_nameinfo;
}
tmp = rb_check_array_type(sa);
if (!NIL_P(tmp)) {
sa = tmp;
MEMZERO(&hints, struct addrinfo, 1);
if (RARRAY_LEN(sa) == 3) {
af = RARRAY_AREF(sa, 0);
port = RARRAY_AREF(sa, 1);
host = RARRAY_AREF(sa, 2);
}
else if (RARRAY_LEN(sa) >= 4) {
af = RARRAY_AREF(sa, 0);
port = RARRAY_AREF(sa, 1);
host = RARRAY_AREF(sa, 3);
if (NIL_P(host)) {
host = RARRAY_AREF(sa, 2);
}
else {
/*
* 4th element holds numeric form, don't resolve.
* see rsock_ipaddr().
*/
#ifdef AI_NUMERICHOST /* AIX 4.3.3 doesn't have AI_NUMERICHOST. */
hints.ai_flags |= AI_NUMERICHOST;
#endif
}
}
else {
rb_raise(rb_eArgError, "array size should be 3 or 4, %ld given",
RARRAY_LEN(sa));
}
/* host */
if (NIL_P(host)) {
hptr = NULL;
}
else {
strncpy(hbuf, StringValueCStr(host), sizeof(hbuf));
hbuf[sizeof(hbuf) - 1] = '\0';
hptr = hbuf;
}
/* port */
if (NIL_P(port)) {
strcpy(pbuf, "0");
pptr = NULL;
}
else if (FIXNUM_P(port)) {
snprintf(pbuf, sizeof(pbuf), "%ld", NUM2LONG(port));
pptr = pbuf;
}
else {
strncpy(pbuf, StringValueCStr(port), sizeof(pbuf));
pbuf[sizeof(pbuf) - 1] = '\0';
pptr = pbuf;
}
hints.ai_socktype = (fl & NI_DGRAM) ? SOCK_DGRAM : SOCK_STREAM;
/* af */
hints.ai_family = NIL_P(af) ? PF_UNSPEC : rsock_family_arg(af);
error = rb_getaddrinfo(hptr, pptr, &hints, &res);
if (error) goto error_exit_addr;
sap = res->ai->ai_addr;
salen = res->ai->ai_addrlen;
}
else {
rb_raise(rb_eTypeError, "expecting String or Array");
}
call_nameinfo:
error = rb_getnameinfo(sap, salen, hbuf, sizeof(hbuf),
pbuf, sizeof(pbuf), fl);
if (error) goto error_exit_name;
if (res) {
for (r = res->ai->ai_next; r; r = r->ai_next) {
char hbuf2[1024], pbuf2[1024];
sap = r->ai_addr;
salen = r->ai_addrlen;
error = rb_getnameinfo(sap, salen, hbuf2, sizeof(hbuf2),
pbuf2, sizeof(pbuf2), fl);
if (error) goto error_exit_name;
if (strcmp(hbuf, hbuf2) != 0|| strcmp(pbuf, pbuf2) != 0) {
rb_freeaddrinfo(res);
rb_raise(rb_eSocket, "sockaddr resolved to multiple nodename");
}
}
rb_freeaddrinfo(res);
}
return rb_assoc_new(rb_str_new2(hbuf), rb_str_new2(pbuf));
error_exit_addr:
saved_errno = errno;
if (res) rb_freeaddrinfo(res);
errno = saved_errno;
rsock_raise_socket_error("getaddrinfo", error);
error_exit_name:
saved_errno = errno;
if (res) rb_freeaddrinfo(res);
errno = saved_errno;
rsock_raise_socket_error("getnameinfo", error);
UNREACHABLE_RETURN(Qnil);
}
/*
* call-seq:
* Socket.sockaddr_in(port, host) => sockaddr
* Socket.pack_sockaddr_in(port, host) => sockaddr
*
* Packs _port_ and _host_ as an AF_INET/AF_INET6 sockaddr string.
*
* Socket.sockaddr_in(80, "127.0.0.1")
* #=> "\x02\x00\x00P\x7F\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
*
* Socket.sockaddr_in(80, "::1")
* #=> "\n\x00\x00P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00"
*
*/
static VALUE
sock_s_pack_sockaddr_in(VALUE self, VALUE port, VALUE host)
{
struct rb_addrinfo *res = rsock_addrinfo(host, port, AF_UNSPEC, 0, 0);
VALUE addr = rb_str_new((char*)res->ai->ai_addr, res->ai->ai_addrlen);
rb_freeaddrinfo(res);
return addr;
}
/*
* call-seq:
* Socket.unpack_sockaddr_in(sockaddr) => [port, ip_address]
*
* Unpacks _sockaddr_ into port and ip_address.
*
* _sockaddr_ should be a string or an addrinfo for AF_INET/AF_INET6.
*
* sockaddr = Socket.sockaddr_in(80, "127.0.0.1")
* p sockaddr #=> "\x02\x00\x00P\x7F\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
* p Socket.unpack_sockaddr_in(sockaddr) #=> [80, "127.0.0.1"]
*
*/
static VALUE
sock_s_unpack_sockaddr_in(VALUE self, VALUE addr)
{
struct sockaddr_in * sockaddr;
VALUE host;
sockaddr = (struct sockaddr_in*)SockAddrStringValuePtr(addr);
if (RSTRING_LEN(addr) <
(char*)&((struct sockaddr *)sockaddr)->sa_family +
sizeof(((struct sockaddr *)sockaddr)->sa_family) -
(char*)sockaddr)
rb_raise(rb_eArgError, "too short sockaddr");
if (((struct sockaddr *)sockaddr)->sa_family != AF_INET
#ifdef INET6
&& ((struct sockaddr *)sockaddr)->sa_family != AF_INET6
#endif
) {
#ifdef INET6
rb_raise(rb_eArgError, "not an AF_INET/AF_INET6 sockaddr");
#else
rb_raise(rb_eArgError, "not an AF_INET sockaddr");
#endif
}
host = rsock_make_ipaddr((struct sockaddr*)sockaddr, RSTRING_SOCKLEN(addr));
return rb_assoc_new(INT2NUM(ntohs(sockaddr->sin_port)), host);
}
#ifdef HAVE_SYS_UN_H
/*
* call-seq:
* Socket.sockaddr_un(path) => sockaddr
* Socket.pack_sockaddr_un(path) => sockaddr
*
* Packs _path_ as an AF_UNIX sockaddr string.
*
* Socket.sockaddr_un("/tmp/sock") #=> "\x01\x00/tmp/sock\x00\x00..."
*
*/
static VALUE
sock_s_pack_sockaddr_un(VALUE self, VALUE path)
{
struct sockaddr_un sockaddr;
VALUE addr;
StringValue(path);
INIT_SOCKADDR_UN(&sockaddr, sizeof(struct sockaddr_un));
if (sizeof(sockaddr.sun_path) < (size_t)RSTRING_LEN(path)) {
rb_raise(rb_eArgError, "too long unix socket path (%"PRIuSIZE" bytes given but %"PRIuSIZE" bytes max)",
(size_t)RSTRING_LEN(path), sizeof(sockaddr.sun_path));
}
memcpy(sockaddr.sun_path, RSTRING_PTR(path), RSTRING_LEN(path));
addr = rb_str_new((char*)&sockaddr, rsock_unix_sockaddr_len(path));
return addr;
}
/*
* call-seq:
* Socket.unpack_sockaddr_un(sockaddr) => path
*
* Unpacks _sockaddr_ into path.
*
* _sockaddr_ should be a string or an addrinfo for AF_UNIX.
*
* sockaddr = Socket.sockaddr_un("/tmp/sock")
* p Socket.unpack_sockaddr_un(sockaddr) #=> "/tmp/sock"
*
*/
static VALUE
sock_s_unpack_sockaddr_un(VALUE self, VALUE addr)
{
struct sockaddr_un * sockaddr;
VALUE path;
sockaddr = (struct sockaddr_un*)SockAddrStringValuePtr(addr);
if (RSTRING_LEN(addr) <
(char*)&((struct sockaddr *)sockaddr)->sa_family +
sizeof(((struct sockaddr *)sockaddr)->sa_family) -
(char*)sockaddr)
rb_raise(rb_eArgError, "too short sockaddr");
if (((struct sockaddr *)sockaddr)->sa_family != AF_UNIX) {
rb_raise(rb_eArgError, "not an AF_UNIX sockaddr");
}
if (sizeof(struct sockaddr_un) < (size_t)RSTRING_LEN(addr)) {
rb_raise(rb_eTypeError, "too long sockaddr_un - %ld longer than %d",
RSTRING_LEN(addr), (int)sizeof(struct sockaddr_un));
}
path = rsock_unixpath_str(sockaddr, RSTRING_SOCKLEN(addr));
return path;
}
#endif
#if defined(HAVE_GETIFADDRS) || defined(SIOCGLIFCONF) || defined(SIOCGIFCONF) || defined(_WIN32)
static socklen_t
sockaddr_len(struct sockaddr *addr)
{
if (addr == NULL)
return 0;
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
if (addr->sa_len != 0)
return addr->sa_len;
#endif
switch (addr->sa_family) {
case AF_INET:
return (socklen_t)sizeof(struct sockaddr_in);
#ifdef AF_INET6
case AF_INET6:
return (socklen_t)sizeof(struct sockaddr_in6);
#endif
#ifdef HAVE_SYS_UN_H
case AF_UNIX:
return (socklen_t)sizeof(struct sockaddr_un);
#endif
#ifdef AF_PACKET
case AF_PACKET:
return (socklen_t)(offsetof(struct sockaddr_ll, sll_addr) + ((struct sockaddr_ll *)addr)->sll_halen);
#endif
default:
return (socklen_t)(offsetof(struct sockaddr, sa_family) + sizeof(addr->sa_family));
}
}
socklen_t
rsock_sockaddr_len(struct sockaddr *addr)
{
return sockaddr_len(addr);
}
static VALUE
sockaddr_obj(struct sockaddr *addr, socklen_t len)
{
#if defined(AF_INET6) && defined(__KAME__)
struct sockaddr_in6 addr6;
#endif
if (addr == NULL)
return Qnil;
len = sockaddr_len(addr);
#if defined(__KAME__) && defined(AF_INET6)
if (addr->sa_family == AF_INET6) {
/* KAME uses the 2nd 16bit word of link local IPv6 address as interface index internally */
/* http://orange.kame.net/dev/cvsweb.cgi/kame/IMPLEMENTATION */
/* convert fe80:1::1 to fe80::1%1 */
len = (socklen_t)sizeof(struct sockaddr_in6);
memcpy(&addr6, addr, len);
addr = (struct sockaddr *)&addr6;
if (IN6_IS_ADDR_LINKLOCAL(&addr6.sin6_addr) &&
addr6.sin6_scope_id == 0 &&
(addr6.sin6_addr.s6_addr[2] || addr6.sin6_addr.s6_addr[3])) {
addr6.sin6_scope_id = (addr6.sin6_addr.s6_addr[2] << 8) | addr6.sin6_addr.s6_addr[3];
addr6.sin6_addr.s6_addr[2] = 0;
addr6.sin6_addr.s6_addr[3] = 0;
}
}
#endif
return rsock_addrinfo_new(addr, len, addr->sa_family, 0, 0, Qnil, Qnil);
}
VALUE
rsock_sockaddr_obj(struct sockaddr *addr, socklen_t len)
{
return sockaddr_obj(addr, len);
}
#endif
#if defined(HAVE_GETIFADDRS) || (defined(SIOCGLIFCONF) && defined(SIOCGLIFNUM) && !defined(__hpux)) || defined(SIOCGIFCONF) || defined(_WIN32)
/*
* call-seq:
* Socket.ip_address_list => array
*
* Returns local IP addresses as an array.
*
* The array contains Addrinfo objects.
*
* pp Socket.ip_address_list
* #=> [#<Addrinfo: 127.0.0.1>,
* #<Addrinfo: 192.168.0.128>,
* #<Addrinfo: ::1>,
* ...]
*
*/
static VALUE
socket_s_ip_address_list(VALUE self)
{
#if defined(HAVE_GETIFADDRS)
struct ifaddrs *ifp = NULL;
struct ifaddrs *p;
int ret;
VALUE list;
ret = getifaddrs(&ifp);
if (ret == -1) {
rb_sys_fail("getifaddrs");
}
list = rb_ary_new();
for (p = ifp; p; p = p->ifa_next) {
if (p->ifa_addr != NULL && IS_IP_FAMILY(p->ifa_addr->sa_family)) {
struct sockaddr *addr = p->ifa_addr;
#if defined(AF_INET6) && defined(__sun)
/*
* OpenIndiana SunOS 5.11 getifaddrs() returns IPv6 link local
* address with sin6_scope_id == 0.
* So fill it from the interface name (ifa_name).
*/
struct sockaddr_in6 addr6;
if (addr->sa_family == AF_INET6) {
socklen_t len = (socklen_t)sizeof(struct sockaddr_in6);
memcpy(&addr6, addr, len);
addr = (struct sockaddr *)&addr6;
if (IN6_IS_ADDR_LINKLOCAL(&addr6.sin6_addr) &&
addr6.sin6_scope_id == 0) {
unsigned int ifindex = if_nametoindex(p->ifa_name);
if (ifindex != 0) {
addr6.sin6_scope_id = ifindex;
}
}
}
#endif
rb_ary_push(list, sockaddr_obj(addr, sockaddr_len(addr)));
}
}
freeifaddrs(ifp);
return list;
#elif defined(SIOCGLIFCONF) && defined(SIOCGLIFNUM) && !defined(__hpux)
/* Solaris if_tcp(7P) */
/* HP-UX has SIOCGLIFCONF too. But it uses different struct */
int fd = -1;
int ret;
struct lifnum ln;
struct lifconf lc;
const char *reason = NULL;
int save_errno;
int i;
VALUE list = Qnil;
lc.lifc_buf = NULL;
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd == -1)
rb_sys_fail("socket(2)");
memset(&ln, 0, sizeof(ln));
ln.lifn_family = AF_UNSPEC;
ret = ioctl(fd, SIOCGLIFNUM, &ln);
if (ret == -1) {
reason = "SIOCGLIFNUM";
goto finish;
}
memset(&lc, 0, sizeof(lc));
lc.lifc_family = AF_UNSPEC;
lc.lifc_flags = 0;
lc.lifc_len = sizeof(struct lifreq) * ln.lifn_count;
lc.lifc_req = xmalloc(lc.lifc_len);
ret = ioctl(fd, SIOCGLIFCONF, &lc);
if (ret == -1) {
reason = "SIOCGLIFCONF";
goto finish;
}
list = rb_ary_new();
for (i = 0; i < ln.lifn_count; i++) {
struct lifreq *req = &lc.lifc_req[i];
if (IS_IP_FAMILY(req->lifr_addr.ss_family)) {
if (req->lifr_addr.ss_family == AF_INET6 &&
IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)(&req->lifr_addr))->sin6_addr) &&
((struct sockaddr_in6 *)(&req->lifr_addr))->sin6_scope_id == 0) {
struct lifreq req2;
memcpy(req2.lifr_name, req->lifr_name, LIFNAMSIZ);
ret = ioctl(fd, SIOCGLIFINDEX, &req2);
if (ret == -1) {
reason = "SIOCGLIFINDEX";
goto finish;
}
((struct sockaddr_in6 *)(&req->lifr_addr))->sin6_scope_id = req2.lifr_index;
}
rb_ary_push(list, sockaddr_obj((struct sockaddr *)&req->lifr_addr, req->lifr_addrlen));
}
}
finish:
save_errno = errno;
if (lc.lifc_buf != NULL)
xfree(lc.lifc_req);
if (fd != -1)
close(fd);
errno = save_errno;
if (reason)
rb_syserr_fail(save_errno, reason);
return list;
#elif defined(SIOCGIFCONF)
int fd = -1;
int ret;
#define EXTRA_SPACE ((int)(sizeof(struct ifconf) + sizeof(union_sockaddr)))
char initbuf[4096+EXTRA_SPACE];
char *buf = initbuf;
int bufsize;
struct ifconf conf;
struct ifreq *req;
VALUE list = Qnil;
const char *reason = NULL;
int save_errno;
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd == -1)
rb_sys_fail("socket(2)");
bufsize = sizeof(initbuf);
buf = initbuf;
retry:
conf.ifc_len = bufsize;
conf.ifc_req = (struct ifreq *)buf;
/* fprintf(stderr, "bufsize: %d\n", bufsize); */
ret = ioctl(fd, SIOCGIFCONF, &conf);
if (ret == -1) {
reason = "SIOCGIFCONF";
goto finish;
}
/* fprintf(stderr, "conf.ifc_len: %d\n", conf.ifc_len); */
if (bufsize - EXTRA_SPACE < conf.ifc_len) {
if (bufsize < conf.ifc_len) {
/* NetBSD returns required size for all interfaces. */
bufsize = conf.ifc_len + EXTRA_SPACE;
}
else {
bufsize = bufsize << 1;
}
if (buf == initbuf)
buf = NULL;
buf = xrealloc(buf, bufsize);
goto retry;
}
close(fd);
fd = -1;
list = rb_ary_new();
req = conf.ifc_req;
while ((char*)req < (char*)conf.ifc_req + conf.ifc_len) {
struct sockaddr *addr = &req->ifr_addr;
if (IS_IP_FAMILY(addr->sa_family)) {
rb_ary_push(list, sockaddr_obj(addr, sockaddr_len(addr)));
}
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
# ifndef _SIZEOF_ADDR_IFREQ
# define _SIZEOF_ADDR_IFREQ(r) \
(sizeof(struct ifreq) + \
(sizeof(struct sockaddr) < (r).ifr_addr.sa_len ? \
(r).ifr_addr.sa_len - sizeof(struct sockaddr) : \
0))
# endif
req = (struct ifreq *)((char*)req + _SIZEOF_ADDR_IFREQ(*req));
#else
req = (struct ifreq *)((char*)req + sizeof(struct ifreq));
#endif
}
finish:
save_errno = errno;
if (buf != initbuf)
xfree(buf);
if (fd != -1)
close(fd);
errno = save_errno;
if (reason)
rb_syserr_fail(save_errno, reason);
return list;
#undef EXTRA_SPACE
#elif defined(_WIN32)
typedef struct ip_adapter_unicast_address_st {
unsigned LONG_LONG dummy0;
struct ip_adapter_unicast_address_st *Next;
struct {
struct sockaddr *lpSockaddr;
int iSockaddrLength;
} Address;
int dummy1;
int dummy2;
int dummy3;
long dummy4;
long dummy5;
long dummy6;
} ip_adapter_unicast_address_t;
typedef struct ip_adapter_anycast_address_st {
unsigned LONG_LONG dummy0;
struct ip_adapter_anycast_address_st *Next;
struct {
struct sockaddr *lpSockaddr;
int iSockaddrLength;
} Address;
} ip_adapter_anycast_address_t;
typedef struct ip_adapter_addresses_st {
unsigned LONG_LONG dummy0;
struct ip_adapter_addresses_st *Next;
void *dummy1;
ip_adapter_unicast_address_t *FirstUnicastAddress;
ip_adapter_anycast_address_t *FirstAnycastAddress;
void *dummy2;
void *dummy3;
void *dummy4;
void *dummy5;
void *dummy6;
BYTE dummy7[8];
DWORD dummy8;
DWORD dummy9;
DWORD dummy10;
DWORD IfType;
int OperStatus;
DWORD dummy12;
DWORD dummy13[16];
void *dummy14;
} ip_adapter_addresses_t;
typedef ULONG (WINAPI *GetAdaptersAddresses_t)(ULONG, ULONG, PVOID, ip_adapter_addresses_t *, PULONG);
HMODULE h;
GetAdaptersAddresses_t pGetAdaptersAddresses;
ULONG len;
DWORD ret;
ip_adapter_addresses_t *adapters;
VALUE list;
h = LoadLibrary("iphlpapi.dll");
if (!h)
rb_notimplement();
pGetAdaptersAddresses = (GetAdaptersAddresses_t)GetProcAddress(h, "GetAdaptersAddresses");
if (!pGetAdaptersAddresses) {
FreeLibrary(h);
rb_notimplement();
}
ret = pGetAdaptersAddresses(AF_UNSPEC, 0, NULL, NULL, &len);
if (ret != ERROR_SUCCESS && ret != ERROR_BUFFER_OVERFLOW) {
errno = rb_w32_map_errno(ret);
FreeLibrary(h);
rb_sys_fail("GetAdaptersAddresses");
}
adapters = (ip_adapter_addresses_t *)ALLOCA_N(BYTE, len);
ret = pGetAdaptersAddresses(AF_UNSPEC, 0, NULL, adapters, &len);
if (ret != ERROR_SUCCESS) {
errno = rb_w32_map_errno(ret);
FreeLibrary(h);
rb_sys_fail("GetAdaptersAddresses");
}
list = rb_ary_new();
for (; adapters; adapters = adapters->Next) {
ip_adapter_unicast_address_t *uni;
ip_adapter_anycast_address_t *any;
if (adapters->OperStatus != 1) /* 1 means IfOperStatusUp */
continue;
for (uni = adapters->FirstUnicastAddress; uni; uni = uni->Next) {
#ifndef INET6
if (uni->Address.lpSockaddr->sa_family == AF_INET)
#else
if (IS_IP_FAMILY(uni->Address.lpSockaddr->sa_family))
#endif
rb_ary_push(list, sockaddr_obj(uni->Address.lpSockaddr, uni->Address.iSockaddrLength));
}
for (any = adapters->FirstAnycastAddress; any; any = any->Next) {
#ifndef INET6
if (any->Address.lpSockaddr->sa_family == AF_INET)
#else
if (IS_IP_FAMILY(any->Address.lpSockaddr->sa_family))
#endif
rb_ary_push(list, sockaddr_obj(any->Address.lpSockaddr, any->Address.iSockaddrLength));
}
}
FreeLibrary(h);
return list;
#endif
}
#else
#define socket_s_ip_address_list rb_f_notimplement
#endif
void
Init_socket(void)
{
rsock_init_basicsocket();
/*
* Document-class: Socket < BasicSocket
*
* Class +Socket+ provides access to the underlying operating system
* socket implementations. It can be used to provide more operating system
* specific functionality than the protocol-specific socket classes.
*
* The constants defined under Socket::Constants are also defined under
* Socket. For example, Socket::AF_INET is usable as well as
* Socket::Constants::AF_INET. See Socket::Constants for the list of
* constants.
*
* === What's a socket?
*
* Sockets are endpoints of a bidirectional communication channel.
* Sockets can communicate within a process, between processes on the same
* machine or between different machines. There are many types of socket:
* TCPSocket, UDPSocket or UNIXSocket for example.
*
* Sockets have their own vocabulary:
*
* *domain:*
* The family of protocols:
* * Socket::PF_INET
* * Socket::PF_INET6
* * Socket::PF_UNIX
* * etc.
*
* *type:*
* The type of communications between the two endpoints, typically
* * Socket::SOCK_STREAM
* * Socket::SOCK_DGRAM.
*
* *protocol:*
* Typically _zero_.
* This may be used to identify a variant of a protocol.
*
* *hostname:*
* The identifier of a network interface:
* * a string (hostname, IPv4 or IPv6 address or +broadcast+
* which specifies a broadcast address)
* * a zero-length string which specifies INADDR_ANY
* * an integer (interpreted as binary address in host byte order).
*
* === Quick start
*
* Many of the classes, such as TCPSocket, UDPSocket or UNIXSocket,
* ease the use of sockets comparatively to the equivalent C programming interface.
*
* Let's create an internet socket using the IPv4 protocol in a C-like manner:
*
* require 'socket'
*
* s = Socket.new Socket::AF_INET, Socket::SOCK_STREAM
* s.connect Socket.pack_sockaddr_in(80, 'example.com')
*
* You could also use the TCPSocket class:
*
* s = TCPSocket.new 'example.com', 80
*
* A simple server might look like this:
*
* require 'socket'
*
* server = TCPServer.new 2000 # Server bound to port 2000
*
* loop do
* client = server.accept # Wait for a client to connect
* client.puts "Hello !"
* client.puts "Time is #{Time.now}"
* client.close
* end
*
* A simple client may look like this:
*
* require 'socket'
*
* s = TCPSocket.new 'localhost', 2000
*
* while line = s.gets # Read lines from socket
* puts line # and print them
* end
*
* s.close # close socket when done
*
* === Exception Handling
*
* Ruby's Socket implementation raises exceptions based on the error
* generated by the system dependent implementation. This is why the
* methods are documented in a way that isolate Unix-based system
* exceptions from Windows based exceptions. If more information on a
* particular exception is needed, please refer to the Unix manual pages or
* the Windows WinSock reference.
*
* === Convenience methods
*
* Although the general way to create socket is Socket.new,
* there are several methods of socket creation for most cases.
*
* TCP client socket::
* Socket.tcp, TCPSocket.open
* TCP server socket::
* Socket.tcp_server_loop, TCPServer.open
* UNIX client socket::
* Socket.unix, UNIXSocket.open
* UNIX server socket::
* Socket.unix_server_loop, UNIXServer.open
*
* === Documentation by
*
* * Zach Dennis
* * Sam Roberts
* * <em>Programming Ruby</em> from The Pragmatic Bookshelf.
*
* Much material in this documentation is taken with permission from
* <em>Programming Ruby</em> from The Pragmatic Bookshelf.
*/
rb_cSocket = rb_define_class("Socket", rb_cBasicSocket);
rsock_init_socket_init();
rb_define_method(rb_cSocket, "initialize", sock_initialize, -1);
rb_define_method(rb_cSocket, "connect", sock_connect, 1);
/* for ext/socket/lib/socket.rb use only: */
rb_define_private_method(rb_cSocket,
"__connect_nonblock", sock_connect_nonblock, 2);
rb_define_method(rb_cSocket, "bind", sock_bind, 1);
rb_define_method(rb_cSocket, "listen", rsock_sock_listen, 1);
rb_define_method(rb_cSocket, "accept", sock_accept, 0);
/* for ext/socket/lib/socket.rb use only: */
rb_define_private_method(rb_cSocket,
"__accept_nonblock", sock_accept_nonblock, 1);
rb_define_method(rb_cSocket, "sysaccept", sock_sysaccept, 0);
rb_define_method(rb_cSocket, "recvfrom", sock_recvfrom, -1);
/* for ext/socket/lib/socket.rb use only: */
rb_define_private_method(rb_cSocket,
"__recvfrom_nonblock", sock_recvfrom_nonblock, 4);
rb_define_singleton_method(rb_cSocket, "socketpair", rsock_sock_s_socketpair, -1);
rb_define_singleton_method(rb_cSocket, "pair", rsock_sock_s_socketpair, -1);
rb_define_singleton_method(rb_cSocket, "gethostname", sock_gethostname, 0);
rb_define_singleton_method(rb_cSocket, "gethostbyname", sock_s_gethostbyname, 1);
rb_define_singleton_method(rb_cSocket, "gethostbyaddr", sock_s_gethostbyaddr, -1);
rb_define_singleton_method(rb_cSocket, "getservbyname", sock_s_getservbyname, -1);
rb_define_singleton_method(rb_cSocket, "getservbyport", sock_s_getservbyport, -1);
rb_define_singleton_method(rb_cSocket, "getaddrinfo", sock_s_getaddrinfo, -1);
rb_define_singleton_method(rb_cSocket, "getnameinfo", sock_s_getnameinfo, -1);
rb_define_singleton_method(rb_cSocket, "sockaddr_in", sock_s_pack_sockaddr_in, 2);
rb_define_singleton_method(rb_cSocket, "pack_sockaddr_in", sock_s_pack_sockaddr_in, 2);
rb_define_singleton_method(rb_cSocket, "unpack_sockaddr_in", sock_s_unpack_sockaddr_in, 1);
#ifdef HAVE_SYS_UN_H
rb_define_singleton_method(rb_cSocket, "sockaddr_un", sock_s_pack_sockaddr_un, 1);
rb_define_singleton_method(rb_cSocket, "pack_sockaddr_un", sock_s_pack_sockaddr_un, 1);
rb_define_singleton_method(rb_cSocket, "unpack_sockaddr_un", sock_s_unpack_sockaddr_un, 1);
#endif
rb_define_singleton_method(rb_cSocket, "ip_address_list", socket_s_ip_address_list, 0);
#undef rb_intern
sym_wait_writable = ID2SYM(rb_intern("wait_writable"));
}
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