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#include <node_net.h>
#include <v8.h>
#include <node.h>
#include <node_buffer.h>
#include <node_io_watcher.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <fcntl.h>
#include <arpa/inet.h> /* inet_pton */
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/ioctl.h>
#ifdef __linux__
# include <linux/sockios.h> /* For the SIOCINQ / FIONREAD ioctl */
#endif
/* Non-linux platforms like OS X define this ioctl elsewhere */
#ifndef FIONREAD
#include <sys/filio.h>
#endif
#include <errno.h>
#ifdef __OpenBSD__
#include <sys/uio.h>
#endif
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a)))
namespace node {
using namespace v8;
static Persistent<String> errno_symbol;
static Persistent<String> syscall_symbol;
static Persistent<String> fd_symbol;
static Persistent<String> size_symbol;
static Persistent<String> address_symbol;
static Persistent<String> port_symbol;
static Persistent<String> type_symbol;
static Persistent<String> tcp_symbol;
static Persistent<String> unix_symbol;
static Persistent<FunctionTemplate> recv_msg_template;
#define FD_ARG(a) \
int fd; \
if (!(a)->IsInt32() || (fd = (a)->Int32Value()) < 0) { \
return ThrowException(Exception::TypeError( \
String::New("Bad file descriptor argument"))); \
}
static inline bool SetCloseOnExec(int fd) {
return (fcntl(fd, F_SETFD, FD_CLOEXEC) != -1);
}
static inline bool SetNonBlock(int fd) {
return (fcntl(fd, F_SETFL, O_NONBLOCK) != -1);
}
static inline bool SetSockFlags(int fd) {
int flags = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&flags, sizeof(flags));
return SetNonBlock(fd) && SetCloseOnExec(fd);
}
// Creates nonblocking pipe
static Handle<Value> Pipe(const Arguments& args) {
HandleScope scope;
int fds[2];
if (pipe(fds) < 0) return ThrowException(ErrnoException(errno, "pipe"));
if (!SetSockFlags(fds[0]) || !SetSockFlags(fds[1])) {
int fcntl_errno = errno;
close(fds[0]);
close(fds[1]);
return ThrowException(ErrnoException(fcntl_errno, "fcntl"));
}
Local<Array> a = Array::New(2);
a->Set(Integer::New(0), Integer::New(fds[0]));
a->Set(Integer::New(1), Integer::New(fds[1]));
return scope.Close(a);
}
// Creates nonblocking socket pair
static Handle<Value> SocketPair(const Arguments& args) {
HandleScope scope;
int fds[2];
// XXX support SOCK_DGRAM?
if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) < 0) {
return ThrowException(ErrnoException(errno, "socketpair"));
}
if (!SetSockFlags(fds[0]) || !SetSockFlags(fds[1])) {
int fcntl_errno = errno;
close(fds[0]);
close(fds[1]);
return ThrowException(ErrnoException(fcntl_errno, "fcntl"));
}
Local<Array> a = Array::New(2);
a->Set(Integer::New(0), Integer::New(fds[0]));
a->Set(Integer::New(1), Integer::New(fds[1]));
return scope.Close(a);
}
// Creates a new non-blocking socket fd
// t.socket("TCP");
// t.socket("UNIX");
// t.socket("UDP");
static Handle<Value> Socket(const Arguments& args) {
HandleScope scope;
// default to TCP
int domain = PF_INET;
int type = SOCK_STREAM;
#ifdef SO_REUSEPORT
bool set_reuseport = false;
#endif
if (args[0]->IsString()) {
String::Utf8Value t(args[0]->ToString());
// FIXME optimize this cascade.
if (0 == strcasecmp(*t, "TCP")) {
domain = PF_INET;
type = SOCK_STREAM;
} else if (0 == strcasecmp(*t, "TCP4")) {
domain = PF_INET;
type = SOCK_STREAM;
} else if (0 == strcasecmp(*t, "TCP6")) {
domain = PF_INET6;
type = SOCK_STREAM;
} else if (0 == strcasecmp(*t, "UNIX")) {
domain = PF_UNIX;
type = SOCK_STREAM;
} else if (0 == strcasecmp(*t, "UNIX_DGRAM")) {
domain = PF_UNIX;
type = SOCK_DGRAM;
} else if (0 == strcasecmp(*t, "UDP")) {
domain = PF_INET;
type = SOCK_DGRAM;
#ifdef SO_REUSEPORT
set_reuseport = true;
#endif
} else if (0 == strcasecmp(*t, "UDP4")) {
domain = PF_INET;
type = SOCK_DGRAM;
#ifdef SO_REUSEPORT
set_reuseport = true;
#endif
} else if (0 == strcasecmp(*t, "UDP6")) {
domain = PF_INET6;
type = SOCK_DGRAM;
#ifdef SO_REUSEPORT
set_reuseport = true;
#endif
} else {
return ThrowException(Exception::Error(
String::New("Unknown socket type.")));
}
}
int fd = socket(domain, type, 0);
if (fd < 0) return ThrowException(ErrnoException(errno, "socket"));
if (!SetSockFlags(fd)) {
int fcntl_errno = errno;
close(fd);
return ThrowException(ErrnoException(fcntl_errno, "fcntl"));
}
#ifdef SO_REUSEPORT
// needed for datagrams to be able to have multiple processes listening to
// e.g. broadcasted datagrams.
if (set_reuseport) {
int flags = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (const char *)&flags,
sizeof(flags));
}
#endif
return scope.Close(Integer::New(fd));
}
// NOT AT ALL THREAD SAFE - but that's okay for node.js
// (yes this is all to avoid one small heap alloc)
static struct sockaddr *addr;
static socklen_t addrlen;
static inline Handle<Value> ParseAddressArgs(Handle<Value> first,
Handle<Value> second,
bool is_bind) {
static struct sockaddr_un un;
static struct sockaddr_in in;
static struct sockaddr_in6 in6;
if (first->IsString() && !second->IsString()) {
// UNIX
String::Utf8Value path(first->ToString());
if ((size_t) path.length() >= ARRAY_SIZE(un.sun_path)) {
return Exception::Error(String::New("Socket path too long"));
}
memset(&un, 0, sizeof un);
un.sun_family = AF_UNIX;
memcpy(un.sun_path, *path, path.length());
addr = (struct sockaddr*)&un;
addrlen = sizeof(un) - sizeof(un.sun_path) + path.length() + 1;
} else {
// TCP or UDP
memset(&in, 0, sizeof in);
memset(&in6, 0, sizeof in6);
int port = first->Int32Value();
in.sin_port = in6.sin6_port = htons(port);
in.sin_family = AF_INET;
in6.sin6_family = AF_INET6;
bool is_ipv4 = true;
if (!second->IsString()) {
in.sin_addr.s_addr = htonl(is_bind ? INADDR_ANY : INADDR_LOOPBACK);
in6.sin6_addr = is_bind ? in6addr_any : in6addr_loopback;
} else {
String::Utf8Value ip(second->ToString());
if (inet_pton(AF_INET, *ip, &(in.sin_addr)) <= 0) {
is_ipv4 = false;
if (inet_pton(AF_INET6, *ip, &(in6.sin6_addr)) <= 0) {
return ErrnoException(errno, "inet_pton", "Invalid IP Address");
}
}
}
addr = is_ipv4 ? (struct sockaddr*)&in : (struct sockaddr*)&in6;
addrlen = is_ipv4 ? sizeof in : sizeof in6;
}
return Handle<Value>();
}
// Bind with UNIX
// t.bind(fd, "/tmp/socket")
// Bind with TCP
// t.bind(fd, 80, "192.168.11.2")
// t.bind(fd, 80)
static Handle<Value> Bind(const Arguments& args) {
HandleScope scope;
if (args.Length() < 2) {
return ThrowException(Exception::TypeError(
String::New("Must have at least two args")));
}
FD_ARG(args[0])
Handle<Value> error = ParseAddressArgs(args[1], args[2], true);
if (!error.IsEmpty()) return ThrowException(error);
int flags = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&flags, sizeof(flags));
int r = bind(fd, addr, addrlen);
if (r < 0) {
return ThrowException(ErrnoException(errno, "bind"));
}
return Undefined();
}
static Handle<Value> Close(const Arguments& args) {
HandleScope scope;
FD_ARG(args[0])
if (0 > close(fd)) {
return ThrowException(ErrnoException(errno, "close"));
}
return Undefined();
}
// t.shutdown(fd, "read"); -- SHUT_RD
// t.shutdown(fd, "write"); -- SHUT_WR
// t.shutdown(fd, "readwrite"); -- SHUT_RDWR
// second arg defaults to "write".
static Handle<Value> Shutdown(const Arguments& args) {
HandleScope scope;
FD_ARG(args[0])
int how = SHUT_WR;
if (args[1]->IsString()) {
String::Utf8Value t(args[1]->ToString());
if (0 == strcasecmp(*t, "write")) {
how = SHUT_WR;
} else if (0 == strcasecmp(*t, "read")) {
how = SHUT_RD;
} else if (0 == strcasecmp(*t, "readwrite")) {
how = SHUT_RDWR;
} else {
return ThrowException(Exception::Error(String::New(
"Unknown shutdown method. (Use 'read', 'write', or 'readwrite'.)")));
}
}
if (0 > shutdown(fd, how)) {
return ThrowException(ErrnoException(errno, "shutdown"));
}
return Undefined();
}
// Connect with unix
// t.connect(fd, "/tmp/socket")
//
// Connect with TCP or UDP
// t.connect(fd, 80, "192.168.11.2")
// t.connect(fd, 80, "::1")
// t.connect(fd, 80)
// the third argument defaults to "::1"
static Handle<Value> Connect(const Arguments& args) {
HandleScope scope;
if (args.Length() < 2) {
return ThrowException(Exception::TypeError(
String::New("Must have at least two args")));
}
FD_ARG(args[0])
Handle<Value> error = ParseAddressArgs(args[1], args[2], false);
if (!error.IsEmpty()) return ThrowException(error);
int r = connect(fd, addr, addrlen);
if (r < 0 && errno != EINPROGRESS) {
return ThrowException(ErrnoException(errno, "connect"));
}
return Undefined();
}
#define ADDRESS_TO_JS(info, address_storage) \
do { \
char ip[INET6_ADDRSTRLEN]; \
int port; \
struct sockaddr_in *a4; \
struct sockaddr_in6 *a6; \
struct sockaddr_un *au; \
switch ((address_storage).ss_family) { \
case AF_INET6: \
a6 = (struct sockaddr_in6*)&(address_storage); \
inet_ntop(AF_INET6, &(a6->sin6_addr), ip, INET6_ADDRSTRLEN); \
port = ntohs(a6->sin6_port); \
(info)->Set(address_symbol, String::New(ip)); \
(info)->Set(port_symbol, Integer::New(port)); \
break; \
case AF_INET: \
a4 = (struct sockaddr_in*)&(address_storage); \
inet_ntop(AF_INET, &(a4->sin_addr), ip, INET6_ADDRSTRLEN); \
port = ntohs(a4->sin_port); \
(info)->Set(address_symbol, String::New(ip)); \
(info)->Set(port_symbol, Integer::New(port)); \
break; \
case AF_UNIX: \
au = (struct sockaddr_un*)&(address_storage); \
(info)->Set(address_symbol, String::New(au->sun_path)); \
break; \
default: \
(info)->Set(address_symbol, String::Empty()); \
} \
} while (0)
static Handle<Value> GetSockName(const Arguments& args) {
HandleScope scope;
FD_ARG(args[0])
struct sockaddr_storage address_storage;
socklen_t len = sizeof(struct sockaddr_storage);
int r = getsockname(fd, (struct sockaddr *) &address_storage, &len);
if (r < 0) {
return ThrowException(ErrnoException(errno, "getsockname"));
}
Local<Object> info = Object::New();
ADDRESS_TO_JS(info, address_storage);
return scope.Close(info);
}
static Handle<Value> GetPeerName(const Arguments& args) {
HandleScope scope;
FD_ARG(args[0])
struct sockaddr_storage address_storage;
socklen_t len = sizeof(struct sockaddr_storage);
int r = getpeername(fd, (struct sockaddr *) &address_storage, &len);
if (r < 0) {
return ThrowException(ErrnoException(errno, "getpeername"));
}
Local<Object> info = Object::New();
ADDRESS_TO_JS(info, address_storage);
return scope.Close(info);
}
static Handle<Value> Listen(const Arguments& args) {
HandleScope scope;
FD_ARG(args[0])
int backlog = args[1]->IsInt32() ? args[1]->Int32Value() : 128;
if (0 > listen(fd, backlog)) {
return ThrowException(ErrnoException(errno, "listen"));
}
return Undefined();
}
// var peerInfo = t.accept(server_fd);
//
// peerInfo.fd
// peerInfo.address
// peerInfo.port
//
// Returns a new nonblocking socket fd. If the listen queue is empty the
// function returns null (wait for server_fd to become readable and try
// again)
static Handle<Value> Accept(const Arguments& args) {
HandleScope scope;
FD_ARG(args[0])
struct sockaddr_storage address_storage;
socklen_t len = sizeof(struct sockaddr_storage);
int peer_fd = accept(fd, (struct sockaddr*) &address_storage, &len);
if (peer_fd < 0) {
if (errno == EAGAIN) return scope.Close(Null());
return ThrowException(ErrnoException(errno, "accept"));
}
if (!SetSockFlags(peer_fd)) {
int fcntl_errno = errno;
close(peer_fd);
return ThrowException(ErrnoException(fcntl_errno, "fcntl"));
}
Local<Object> peer_info = Object::New();
peer_info->Set(fd_symbol, Integer::New(peer_fd));
ADDRESS_TO_JS(peer_info, address_storage);
return scope.Close(peer_info);
}
static Handle<Value> SocketError(const Arguments& args) {
HandleScope scope;
FD_ARG(args[0])
int error;
socklen_t len = sizeof(int);
int r = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len);
if (r < 0) {
return ThrowException(ErrnoException(errno, "getsockopt"));
}
return scope.Close(Integer::New(error));
}
// var bytesRead = t.read(fd, buffer, offset, length);
// returns null on EAGAIN or EINTR, raises an exception on all other errors
// returns 0 on EOF.
static Handle<Value> Read(const Arguments& args) {
HandleScope scope;
if (args.Length() < 4) {
return ThrowException(Exception::TypeError(
String::New("Takes 4 parameters")));
}
FD_ARG(args[0])
if (!Buffer::HasInstance(args[1])) {
return ThrowException(Exception::TypeError(
String::New("Second argument should be a buffer")));
}
Local<Object> buffer_obj = args[1]->ToObject();
char *buffer_data = Buffer::Data(buffer_obj);
size_t buffer_length = Buffer::Length(buffer_obj);
size_t off = args[2]->Int32Value();
if (off >= buffer_length) {
return ThrowException(Exception::Error(
String::New("Offset is out of bounds")));
}
size_t len = args[3]->Int32Value();
if (off + len > buffer_length) {
return ThrowException(Exception::Error(
String::New("Length is extends beyond buffer")));
}
ssize_t bytes_read = read(fd, (char*)buffer_data + off, len);
if (bytes_read < 0) {
if (errno == EAGAIN || errno == EINTR) return Null();
return ThrowException(ErrnoException(errno, "read"));
}
return scope.Close(Integer::New(bytes_read));
}
// var info = t.recvfrom(fd, buffer, offset, length, flags);
// info.size // bytes read
// info.port // from port
// info.address // from address
// returns null on EAGAIN or EINTR, raises an exception on all other errors
// returns object otherwise
static Handle<Value> RecvFrom(const Arguments& args) {
HandleScope scope;
if (args.Length() < 5) {
return ThrowException(Exception::TypeError(
String::New("Takes 5 parameters")));
}
FD_ARG(args[0])
if (!Buffer::HasInstance(args[1])) {
return ThrowException(Exception::TypeError(
String::New("Second argument should be a buffer")));
}
Local<Object> buffer_obj = args[1]->ToObject();
char *buffer_data = Buffer::Data(buffer_obj);
size_t buffer_length = Buffer::Length(buffer_obj);
size_t off = args[2]->Int32Value();
if (off >= buffer_length) {
return ThrowException(Exception::Error(
String::New("Offset is out of bounds")));
}
size_t len = args[3]->Int32Value();
if (off + len > buffer_length) {
return ThrowException(Exception::Error(
String::New("Length is extends beyond buffer")));
}
int flags = args[4]->Int32Value();
struct sockaddr_storage address_storage;
socklen_t addrlen = sizeof(struct sockaddr_storage);
ssize_t bytes_read = recvfrom(fd, (char*)buffer_data + off, len, flags,
(struct sockaddr*) &address_storage, &addrlen);
if (bytes_read < 0) {
if (errno == EAGAIN || errno == EINTR) return Null();
return ThrowException(ErrnoException(errno, "read"));
}
Local<Object> info = Object::New();
info->Set(size_symbol, Integer::New(bytes_read));
ADDRESS_TO_JS(info, address_storage);
return scope.Close(info);
}
// bytesRead = t.recvMsg(fd, buffer, offset, length)
// if (recvMsg.fd) {
// receivedFd = recvMsg.fd;
// }
static Handle<Value> RecvMsg(const Arguments& args) {
HandleScope scope;
if (args.Length() < 4) {
return ThrowException(Exception::TypeError(
String::New("Takes 4 parameters")));
}
FD_ARG(args[0])
if (!Buffer::HasInstance(args[1])) {
return ThrowException(Exception::TypeError(
String::New("Second argument should be a buffer")));
}
Local<Object> buffer_obj = args[1]->ToObject();
char *buffer_data = Buffer::Data(buffer_obj);
size_t buffer_length = Buffer::Length(buffer_obj);
size_t off = args[2]->Int32Value();
if (off >= buffer_length) {
return ThrowException(Exception::Error(
String::New("Offset is out of bounds")));
}
size_t len = args[3]->Int32Value();
if (off + len > buffer_length) {
return ThrowException(Exception::Error(
String::New("Length is extends beyond buffer")));
}
struct iovec iov[1];
iov[0].iov_base = (char*)buffer_data + off;
iov[0].iov_len = len;
struct msghdr msg;
msg.msg_flags = 0;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
msg.msg_name = NULL;
msg.msg_namelen = 0;
/* Set up to receive a descriptor even if one isn't in the message */
char cmsg_space[64]; // should be big enough
msg.msg_controllen = 64;
msg.msg_control = (void *) cmsg_space;
ssize_t bytes_read = recvmsg(fd, &msg, 0);
if (bytes_read < 0) {
if (errno == EAGAIN || errno == EINTR) return Null();
return ThrowException(ErrnoException(errno, "recvMsg"));
}
// Why not return a two element array here [bytesRead, fd]? Because
// creating an object for each recvmsg() action is heavy. Instead we just
// assign the recved fd to a globalally accessable variable (recvMsg.fd)
// that the wrapper can pick up. Since we're single threaded, this is not
// a problem - just make sure to copy out that variable before the next
// call to recvmsg().
//
// XXX: Some implementations can send multiple file descriptors in a
// single message. We should be using CMSG_NXTHDR() to walk the
// chain to get at them all. This would require changing the
// API to hand these back up the caller, is a pain.
int received_fd = -1;
for (struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
msg.msg_controllen > 0 && cmsg != NULL;
cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_type == SCM_RIGHTS) {
if (received_fd != -1) {
fprintf(stderr, "ignoring extra FD received: %d\n", received_fd);
}
received_fd = *(int *) CMSG_DATA(cmsg);
} else {
fprintf(stderr, "ignoring non-SCM_RIGHTS ancillary data: %d\n",
cmsg->cmsg_type
);
}
}
recv_msg_template->GetFunction()->Set(
fd_symbol,
(received_fd != -1) ?
Integer::New(received_fd) :
Null()
);
return scope.Close(Integer::New(bytes_read));
}
// var bytesWritten = t.write(fd, buffer, offset, length);
// returns null on EAGAIN or EINTR, raises an exception on all other errors
static Handle<Value> Write(const Arguments& args) {
HandleScope scope;
if (args.Length() < 4) {
return ThrowException(Exception::TypeError(
String::New("Takes 4 parameters")));
}
FD_ARG(args[0])
if (!Buffer::HasInstance(args[1])) {
return ThrowException(Exception::TypeError(
String::New("Second argument should be a buffer")));
}
Local<Object> buffer_obj = args[1]->ToObject();
char *buffer_data = Buffer::Data(buffer_obj);
size_t buffer_length = Buffer::Length(buffer_obj);
size_t off = args[2]->Int32Value();
if (off >= buffer_length) {
return ThrowException(Exception::Error(
String::New("Offset is out of bounds")));
}
size_t len = args[3]->Int32Value();
if (off + len > buffer_length) {
return ThrowException(Exception::Error(
String::New("Length is extends beyond buffer")));
}
ssize_t written = write(fd, buffer_data + off, len);
if (written < 0) {
if (errno == EAGAIN || errno == EINTR) {
return scope.Close(Integer::New(0));
}
return ThrowException(ErrnoException(errno, "write"));
}
return scope.Close(Integer::New(written));
}
// var bytes = sendmsg(fd, buf, off, len, fd, flags);
//
// Write a buffer with optional offset and length to the given file
// descriptor. Note that we refuse to send 0 bytes.
//
// The 'fd' parameter is a numerical file descriptor, or the undefined value
// to send none.
//
// The 'flags' parameter is a number representing a bitmask of MSG_* values.
// This is passed directly to sendmsg().
//
// Returns null on EAGAIN or EINTR, raises an exception on all other errors
static Handle<Value> SendMsg(const Arguments& args) {
HandleScope scope;
struct iovec iov;
if (args.Length() < 2) {
return ThrowException(Exception::TypeError(
String::New("Takes 2 parameters")));
}
// The first argument should be a file descriptor
FD_ARG(args[0])
// Grab the actul data to be written, stuffing it into iov
if (!Buffer::HasInstance(args[1])) {
return ThrowException(Exception::TypeError(
String::New("Expected either a string or a buffer")));
}
Local<Object> buffer_obj = args[1]->ToObject();
char *buffer_data = Buffer::Data(buffer_obj);
size_t buffer_length = Buffer::Length(buffer_obj);
size_t offset = 0;
if (args.Length() >= 3 && !args[2]->IsUndefined()) {
if (!args[2]->IsUint32()) {
return ThrowException(Exception::TypeError(
String::New("Expected unsigned integer for offset")));
}
offset = args[2]->Uint32Value();
if (offset >= buffer_length) {
return ThrowException(Exception::Error(
String::New("Offset into buffer too large")));
}
}
size_t length = buffer_length - offset;
if (args.Length() >= 4 && !args[3]->IsUndefined()) {
if (!args[3]->IsUint32()) {
return ThrowException(Exception::TypeError(
String::New("Expected unsigned integer for length")));
}
length = args[3]->Uint32Value();
if (offset + length > buffer_length) {
return ThrowException(Exception::Error(
String::New("offset + length beyond buffer length")));
}
}
iov.iov_base = buffer_data + offset;
iov.iov_len = length;
int fd_to_send = -1;
if (args.Length() >= 5 && !args[4]->IsUndefined()) {
if (!args[4]->IsUint32()) {
return ThrowException(Exception::TypeError(
String::New("Expected unsigned integer for a file descriptor")));
}
fd_to_send = args[4]->Uint32Value();
}
int flags = 0;
if (args.Length() >= 6 && !args[5]->IsUndefined()) {
if (!args[5]->IsUint32()) {
return ThrowException(Exception::TypeError(
String::New("Expected unsigned integer for a flags argument")));
}
flags = args[5]->Uint32Value();
}
struct msghdr msg;
char scratch[64];
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_flags = 0;
msg.msg_control = NULL;
msg.msg_controllen = 0;
if (fd_to_send >= 0) {
struct cmsghdr *cmsg;
msg.msg_control = (void *) scratch;
msg.msg_controllen = CMSG_LEN(sizeof(fd_to_send));
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = msg.msg_controllen;
*(int*) CMSG_DATA(cmsg) = fd_to_send;
}
ssize_t written = sendmsg(fd, &msg, flags);
if (written < 0) {
if (errno == EAGAIN || errno == EINTR) return Null();
return ThrowException(ErrnoException(errno, "sendmsg"));
}
/* Note that the FD isn't explicitly closed here, this
* happens in the JS */
return scope.Close(Integer::New(written));
}
// var bytes = sendto(fd, buf, off, len, flags, destination port, desitnation address);
//
// Write a buffer with optional offset and length to the given file
// descriptor. Note that we refuse to send 0 bytes.
//
// The 'fd' parameter is a numerical file descriptor, or the undefined value
// to send none.
//
// The 'flags' parameter is a number representing a bitmask of MSG_* values.
// This is passed directly to sendmsg().
//
// The destination port can either be an int port, or a path.
//
// Returns null on EAGAIN or EINTR, raises an exception on all other errors
static Handle<Value> SendTo(const Arguments& args) {
HandleScope scope;
if (args.Length() < 5) {
return ThrowException(Exception::TypeError(
String::New("Takes 5 or 6 parameters")));
}
// The first argument should be a file descriptor
FD_ARG(args[0])
// Grab the actul data to be written
if (!Buffer::HasInstance(args[1])) {
return ThrowException(Exception::TypeError(
String::New("Expected either a string or a buffer")));
}
Local<Object> buffer_obj = args[1]->ToObject();
char *buffer_data = Buffer::Data(buffer_obj);
size_t buffer_length = Buffer::Length(buffer_obj);
size_t offset = 0;
if (args.Length() >= 3 && !args[2]->IsUndefined()) {
if (!args[2]->IsUint32()) {
return ThrowException(Exception::TypeError(
String::New("Expected unsigned integer for offset")));
}
offset = args[2]->Uint32Value();
if (offset >= buffer_length) {
return ThrowException(Exception::Error(
String::New("Offset into buffer too large")));
}
}
size_t length = buffer_length - offset;
if (args.Length() >= 4 && !args[3]->IsUndefined()) {
if (!args[3]->IsUint32()) {
return ThrowException(Exception::TypeError(
String::New("Expected unsigned integer for length")));
}
length = args[3]->Uint32Value();
if (offset + length > buffer_length) {
return ThrowException(Exception::Error(
String::New("offset + length beyond buffer length")));
}
}
int flags = 0;
if (args.Length() >= 5 && !args[4]->IsUndefined()) {
if (!args[4]->IsUint32()) {
return ThrowException(Exception::TypeError(
String::New("Expected unsigned integer for a flags argument")));
}
flags = args[4]->Uint32Value();
}
Handle<Value> error = ParseAddressArgs(args[5], args[6], false);
if (!error.IsEmpty()) return ThrowException(error);
ssize_t written = sendto(fd, buffer_data + offset, length, flags, addr, addrlen);
if (written < 0) {
if (errno == EAGAIN || errno == EINTR) return Null();
return ThrowException(ErrnoException(errno, "sendto"));
}
/* Note that the FD isn't explicitly closed here, this
* happens in the JS */
return scope.Close(Integer::New(written));
}
// Probably only works for Linux TCP sockets?
// Returns the amount of data on the read queue.
static Handle<Value> ToRead(const Arguments& args) {
HandleScope scope;
FD_ARG(args[0])
int value;
int r = ioctl(fd, FIONREAD, &value);
if (r < 0) {
return ThrowException(ErrnoException(errno, "ioctl"));
}
return scope.Close(Integer::New(value));
}