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ruby/ext/socket/init.c

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/************************************************
init.c -
created at: Thu Mar 31 12:21:29 JST 1994
Copyright (C) 1993-2007 Yukihiro Matsumoto
************************************************/
#include "rubysocket.h"
#ifdef _WIN32
VALUE rb_w32_conv_from_wchar(const WCHAR *wstr, rb_encoding *enc);
#endif
VALUE rb_cBasicSocket;
VALUE rb_cIPSocket;
VALUE rb_cTCPSocket;
VALUE rb_cTCPServer;
VALUE rb_cUDPSocket;
#ifdef AF_UNIX
VALUE rb_cUNIXSocket;
VALUE rb_cUNIXServer;
#endif
VALUE rb_cSocket;
VALUE rb_cAddrinfo;
VALUE rb_eSocket;
VALUE rb_eResolution;
#ifdef SOCKS
VALUE rb_cSOCKSSocket;
#endif
int rsock_do_not_reverse_lookup = 1;
static VALUE sym_wait_readable;
static ID id_error_code;
void
rsock_raise_resolution_error(const char *reason, int error)
{
#ifdef EAI_SYSTEM
int e;
if (error == EAI_SYSTEM && (e = errno) != 0)
rb_syserr_fail(e, reason);
#endif
#ifdef _WIN32
rb_encoding *enc = rb_default_internal_encoding();
VALUE msg = rb_sprintf("%s: ", reason);
if (!enc) enc = rb_default_internal_encoding();
rb_str_concat(msg, rb_w32_conv_from_wchar(gai_strerrorW(error), enc));
#else
VALUE msg = rb_sprintf("%s: %s", reason, gai_strerror(error));
#endif
StringValue(msg);
VALUE self = rb_class_new_instance(1, &msg, rb_eResolution);
rb_ivar_set(self, id_error_code, INT2NUM(error));
rb_exc_raise(self);
}
#if defined __APPLE__
# define do_write_retry(code) do {ret = code;} while (ret == -1 && errno == EPROTOTYPE)
#else
# define do_write_retry(code) ret = code
#endif
VALUE
rsock_init_sock(VALUE sock, int fd)
{
rb_io_t *fp;
rb_update_max_fd(fd);
MakeOpenFile(sock, fp);
fp->fd = fd;
fp->mode = FMODE_READWRITE|FMODE_DUPLEX;
rb_io_ascii8bit_binmode(sock);
if (rsock_do_not_reverse_lookup) {
fp->mode |= FMODE_NOREVLOOKUP;
}
rb_io_synchronized(fp);
return sock;
}
VALUE
rsock_sendto_blocking(void *data)
{
struct rsock_send_arg *arg = data;
VALUE mesg = arg->mesg;
ssize_t ret;
do_write_retry(sendto(arg->fd, RSTRING_PTR(mesg), RSTRING_LEN(mesg),
arg->flags, arg->to, arg->tolen));
return (VALUE)ret;
}
VALUE
rsock_send_blocking(void *data)
{
struct rsock_send_arg *arg = data;
VALUE mesg = arg->mesg;
ssize_t ret;
do_write_retry(send(arg->fd, RSTRING_PTR(mesg), RSTRING_LEN(mesg),
arg->flags));
return (VALUE)ret;
}
struct recvfrom_arg {
int fd, flags;
VALUE str;
size_t length;
socklen_t alen;
union_sockaddr buf;
};
static VALUE
recvfrom_blocking(void *data)
{
struct recvfrom_arg *arg = data;
socklen_t len0 = arg->alen;
ssize_t ret;
ret = recvfrom(arg->fd, RSTRING_PTR(arg->str), arg->length,
arg->flags, &arg->buf.addr, &arg->alen);
if (ret != -1 && len0 < arg->alen)
arg->alen = len0;
return (VALUE)ret;
}
static VALUE
rsock_strbuf(VALUE str, long buflen)
{
long len;
if (NIL_P(str)) return rb_str_new(0, buflen);
StringValue(str);
len = RSTRING_LEN(str);
if (len >= buflen) {
rb_str_modify(str);
} else {
rb_str_modify_expand(str, buflen - len);
}
return str;
}
static VALUE
recvfrom_locktmp(VALUE v)
{
struct recvfrom_arg *arg = (struct recvfrom_arg *)v;
return rb_thread_io_blocking_region(recvfrom_blocking, arg, arg->fd);
}
int
rsock_is_dgram(rb_io_t *fptr)
{
int socktype;
socklen_t optlen = (socklen_t)sizeof(socktype);
int ret = getsockopt(fptr->fd, SOL_SOCKET, SO_TYPE, (void*)&socktype, &optlen);
if (ret == -1) {
rb_sys_fail("getsockopt(SO_TYPE)");
}
return socktype == SOCK_DGRAM;
}
VALUE
rsock_s_recvfrom(VALUE socket, int argc, VALUE *argv, enum sock_recv_type from)
{
rb_io_t *fptr;
VALUE str;
struct recvfrom_arg arg;
VALUE len, flg;
long buflen;
long slen;
rb_scan_args(argc, argv, "12", &len, &flg, &str);
if (flg == Qnil)
arg.flags = 0;
else
arg.flags = NUM2INT(flg);
buflen = NUM2INT(len);
str = rsock_strbuf(str, buflen);
RB_IO_POINTER(socket, fptr);
if (rb_io_read_pending(fptr)) {
rb_raise(rb_eIOError, "recv for buffered IO");
}
arg.fd = fptr->fd;
arg.alen = (socklen_t)sizeof(arg.buf);
arg.str = str;
arg.length = buflen;
while (true) {
rb_io_check_closed(fptr);
#ifdef RSOCK_WAIT_BEFORE_BLOCKING
rb_io_wait(fptr->self, RB_INT2NUM(RUBY_IO_READABLE), Qnil);
#endif
slen = (long)rb_str_locktmp_ensure(str, recvfrom_locktmp, (VALUE)&arg);
if (slen == 0 && !rsock_is_dgram(fptr)) {
return Qnil;
}
if (slen >= 0) break;
if (!rb_io_maybe_wait_readable(errno, socket, RUBY_IO_TIMEOUT_DEFAULT))
rb_sys_fail("recvfrom(2)");
}
/* Resize the string to the amount of data received */
rb_str_set_len(str, slen);
switch (from) {
case RECV_RECV:
return str;
case RECV_IP:
#if 0
if (arg.alen != sizeof(struct sockaddr_in)) {
rb_raise(rb_eTypeError, "sockaddr size differs - should not happen");
}
#endif
if (arg.alen && arg.alen != sizeof(arg.buf)) /* OSX doesn't return a from result for connection-oriented sockets */
return rb_assoc_new(str, rsock_ipaddr(&arg.buf.addr, arg.alen, fptr->mode & FMODE_NOREVLOOKUP));
else
return rb_assoc_new(str, Qnil);
#ifdef HAVE_TYPE_STRUCT_SOCKADDR_UN
case RECV_UNIX:
return rb_assoc_new(str, rsock_unixaddr(&arg.buf.un, arg.alen));
#endif
case RECV_SOCKET:
return rb_assoc_new(str, rsock_io_socket_addrinfo(socket, &arg.buf.addr, arg.alen));
default:
rb_bug("rsock_s_recvfrom called with bad value");
}
}
VALUE
rsock_s_recvfrom_nonblock(VALUE sock, VALUE len, VALUE flg, VALUE str,
VALUE ex, enum sock_recv_type from)
{
rb_io_t *fptr;
union_sockaddr buf;
socklen_t alen = (socklen_t)sizeof buf;
long buflen;
long slen;
int fd, flags;
VALUE addr = Qnil;
socklen_t len0;
flags = NUM2INT(flg);
buflen = NUM2INT(len);
str = rsock_strbuf(str, buflen);
#ifdef MSG_DONTWAIT
/* MSG_DONTWAIT avoids the race condition between fcntl and recvfrom.
It is not portable, though. */
flags |= MSG_DONTWAIT;
#endif
GetOpenFile(sock, fptr);
if (rb_io_read_pending(fptr)) {
rb_raise(rb_eIOError, "recvfrom for buffered IO");
}
fd = fptr->fd;
rb_io_check_closed(fptr);
if (!MSG_DONTWAIT_RELIABLE)
rb_io_set_nonblock(fptr);
len0 = alen;
slen = recvfrom(fd, RSTRING_PTR(str), buflen, flags, &buf.addr, &alen);
if (slen != -1 && len0 < alen)
alen = len0;
if (slen == 0 && !rsock_is_dgram(fptr)) {
return Qnil;
}
if (slen < 0) {
int e = errno;
switch (e) {
case EAGAIN:
#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
case EWOULDBLOCK:
#endif
if (ex == Qfalse)
return sym_wait_readable;
rb_readwrite_syserr_fail(RB_IO_WAIT_READABLE, e, "recvfrom(2) would block");
}
rb_syserr_fail(e, "recvfrom(2)");
}
if (slen != RSTRING_LEN(str)) {
rb_str_set_len(str, slen);
}
switch (from) {
case RECV_RECV:
return str;
case RECV_IP:
if (alen && alen != sizeof(buf)) /* connection-oriented socket may not return a from result */
addr = rsock_ipaddr(&buf.addr, alen, fptr->mode & FMODE_NOREVLOOKUP);
break;
case RECV_SOCKET:
addr = rsock_io_socket_addrinfo(sock, &buf.addr, alen);
break;
default:
rb_bug("rsock_s_recvfrom_nonblock called with bad value");
}
return rb_assoc_new(str, addr);
}
#if MSG_DONTWAIT_RELIABLE
static VALUE sym_wait_writable;
/* copied from io.c :< */
static long
read_buffered_data(char *ptr, long len, rb_io_t *fptr)
{
int n = fptr->rbuf.len;
if (n <= 0) return 0;
if (n > len) n = (int)len;
MEMMOVE(ptr, fptr->rbuf.ptr+fptr->rbuf.off, char, n);
fptr->rbuf.off += n;
fptr->rbuf.len -= n;
return n;
}
/* :nodoc: */
VALUE
rsock_read_nonblock(VALUE sock, VALUE length, VALUE buf, VALUE ex)
{
rb_io_t *fptr;
long n;
long len = NUM2LONG(length);
VALUE str = rsock_strbuf(buf, len);
char *ptr;
GetOpenFile(sock, fptr);
if (len == 0) {
rb_str_set_len(str, 0);
return str;
}
ptr = RSTRING_PTR(str);
n = read_buffered_data(ptr, len, fptr);
if (n <= 0) {
n = (long)recv(fptr->fd, ptr, len, MSG_DONTWAIT);
if (n < 0) {
int e = errno;
if ((e == EWOULDBLOCK || e == EAGAIN)) {
if (ex == Qfalse) return sym_wait_readable;
rb_readwrite_syserr_fail(RB_IO_WAIT_READABLE,
e, "read would block");
}
rb_syserr_fail_path(e, fptr->pathv);
}
}
if (n != RSTRING_LEN(str)) {
rb_str_modify(str);
rb_str_set_len(str, n);
}
if (n == 0) {
if (ex == Qfalse) return Qnil;
rb_eof_error();
}
return str;
}
/* :nodoc: */
VALUE
rsock_write_nonblock(VALUE sock, VALUE str, VALUE ex)
{
rb_io_t *fptr;
long n;
if (!RB_TYPE_P(str, T_STRING))
str = rb_obj_as_string(str);
sock = rb_io_get_write_io(sock);
GetOpenFile(sock, fptr);
rb_io_check_writable(fptr);
/*
* As with IO#write_nonblock, we may block if somebody is relying on
* buffered I/O; but nobody actually hits this because pipes and sockets
* are not userspace-buffered in Ruby by default.
*/
if (fptr->wbuf.len > 0) {
rb_io_flush(sock);
}
#ifdef __APPLE__
again:
#endif
n = (long)send(fptr->fd, RSTRING_PTR(str), RSTRING_LEN(str), MSG_DONTWAIT);
if (n < 0) {
int e = errno;
#ifdef __APPLE__
if (e == EPROTOTYPE) {
goto again;
}
#endif
if (e == EWOULDBLOCK || e == EAGAIN) {
if (ex == Qfalse) return sym_wait_writable;
rb_readwrite_syserr_fail(RB_IO_WAIT_WRITABLE, e,
"write would block");
}
rb_syserr_fail_path(e, fptr->pathv);
}
return LONG2FIX(n);
}
#endif /* MSG_DONTWAIT_RELIABLE */
static int
rsock_socket0(int domain, int type, int proto)
{
#ifdef SOCK_CLOEXEC
type |= SOCK_CLOEXEC;
#endif
#ifdef SOCK_NONBLOCK
type |= SOCK_NONBLOCK;
#endif
int result = socket(domain, type, proto);
if (result == -1)
return -1;
rb_fd_fix_cloexec(result);
#ifndef SOCK_NONBLOCK
rsock_make_fd_nonblock(result);
#endif
return result;
}
int
rsock_socket(int domain, int type, int proto)
{
int fd;
fd = rsock_socket0(domain, type, proto);
if (fd < 0) {
if (rb_gc_for_fd(errno)) {
fd = rsock_socket0(domain, type, proto);
}
}
if (0 <= fd)
rb_update_max_fd(fd);
return fd;
}
/* emulate blocking connect behavior on EINTR or non-blocking socket */
static int
wait_connectable(int fd, struct timeval *timeout)
{
int sockerr, revents;
socklen_t sockerrlen;
sockerrlen = (socklen_t)sizeof(sockerr);
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (void *)&sockerr, &sockerrlen) < 0)
return -1;
/* necessary for non-blocking sockets (at least ECONNREFUSED) */
switch (sockerr) {
case 0:
break;
#ifdef EALREADY
case EALREADY:
#endif
#ifdef EISCONN
case EISCONN:
#endif
#ifdef ECONNREFUSED
case ECONNREFUSED:
#endif
#ifdef EHOSTUNREACH
case EHOSTUNREACH:
#endif
errno = sockerr;
return -1;
}
/*
* Stevens book says, successful finish turn on RB_WAITFD_OUT and
* failure finish turn on both RB_WAITFD_IN and RB_WAITFD_OUT.
* So it's enough to wait only RB_WAITFD_OUT and check the pending error
* by getsockopt().
*
* Note: rb_wait_for_single_fd already retries on EINTR/ERESTART
*/
revents = rb_wait_for_single_fd(fd, RB_WAITFD_IN|RB_WAITFD_OUT, timeout);
if (revents < 0)
return -1;
sockerrlen = (socklen_t)sizeof(sockerr);
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (void *)&sockerr, &sockerrlen) < 0)
return -1;
switch (sockerr) {
case 0:
/*
* be defensive in case some platforms set SO_ERROR on the original,
* interrupted connect()
*/
/* when the connection timed out, no errno is set and revents is 0. */
if (timeout && revents == 0) {
errno = ETIMEDOUT;
return -1;
}
case EINTR:
#ifdef ERESTART
case ERESTART:
#endif
case EAGAIN:
#ifdef EINPROGRESS
case EINPROGRESS:
#endif
#ifdef EALREADY
case EALREADY:
#endif
#ifdef EISCONN
case EISCONN:
#endif
return 0; /* success */
default:
/* likely (but not limited to): ECONNREFUSED, ETIMEDOUT, EHOSTUNREACH */
errno = sockerr;
return -1;
}
return 0;
}
struct connect_arg {
int fd;
socklen_t len;
const struct sockaddr *sockaddr;
};
static VALUE
connect_blocking(void *data)
{
struct connect_arg *arg = data;
return (VALUE)connect(arg->fd, arg->sockaddr, arg->len);
}
#if defined(SOCKS) && !defined(SOCKS5)
static VALUE
socks_connect_blocking(void *data)
{
struct connect_arg *arg = data;
return (VALUE)Rconnect(arg->fd, arg->sockaddr, arg->len);
}
#endif
int
rsock_connect(int fd, const struct sockaddr *sockaddr, int len, int socks, struct timeval *timeout)
{
int status;
rb_blocking_function_t *func = connect_blocking;
struct connect_arg arg;
arg.fd = fd;
arg.sockaddr = sockaddr;
arg.len = len;
#if defined(SOCKS) && !defined(SOCKS5)
if (socks) func = socks_connect_blocking;
#endif
status = (int)BLOCKING_REGION_FD(func, &arg);
if (status < 0) {
switch (errno) {
case EINTR:
#ifdef ERESTART
case ERESTART:
#endif
case EAGAIN:
#ifdef EINPROGRESS
case EINPROGRESS:
#endif
return wait_connectable(fd, timeout);
}
}
return status;
}
void
rsock_make_fd_nonblock(int fd)
{
#ifdef _WIN32
return;
#endif
int flags;
#ifdef F_GETFL
flags = fcntl(fd, F_GETFL);
if (flags == -1) {
rb_sys_fail("fnctl(2)");
}
#else
flags = 0;
#endif
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) == -1) {
rb_sys_fail("fnctl(2)");
}
}
static int
cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len)
{
socklen_t len0 = 0;
if (address_len) len0 = *address_len;
#ifdef HAVE_ACCEPT4
int flags = SOCK_CLOEXEC;
#ifdef SOCK_NONBLOCK
flags |= SOCK_NONBLOCK;
#endif
int result = accept4(socket, address, address_len, flags);
if (result == -1) return -1;
#ifndef SOCK_NONBLOCK
rsock_make_fd_nonblock(result);
#endif
#else
int result = accept(socket, address, address_len);
if (result == -1) return -1;
rb_maygvl_fd_fix_cloexec(result);
rsock_make_fd_nonblock(result);
#endif
if (address_len && len0 < *address_len) *address_len = len0;
return result;
}
VALUE
rsock_s_accept_nonblock(VALUE klass, VALUE ex, rb_io_t *fptr,
struct sockaddr *sockaddr, socklen_t *len)
{
int fd2;
rb_io_set_nonblock(fptr);
fd2 = cloexec_accept(fptr->fd, (struct sockaddr*)sockaddr, len);
if (fd2 < 0) {
int e = errno;
switch (e) {
case EAGAIN:
#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
case EWOULDBLOCK:
#endif
case ECONNABORTED:
#if defined EPROTO
case EPROTO:
#endif
if (ex == Qfalse)
return sym_wait_readable;
rb_readwrite_syserr_fail(RB_IO_WAIT_READABLE, e, "accept(2) would block");
}
rb_syserr_fail(e, "accept(2)");
}
rb_update_max_fd(fd2);
return rsock_init_sock(rb_obj_alloc(klass), fd2);
}
struct accept_arg {
int fd;
struct sockaddr *sockaddr;
socklen_t *len;
};
static VALUE
accept_blocking(void *data)
{
struct accept_arg *arg = data;
return (VALUE)cloexec_accept(arg->fd, arg->sockaddr, arg->len);
}
VALUE
rsock_s_accept(VALUE klass, VALUE io, struct sockaddr *sockaddr, socklen_t *len)
{
rb_io_t *fptr = NULL;
RB_IO_POINTER(io, fptr);
struct accept_arg accept_arg = {
.fd = fptr->fd,
.sockaddr = sockaddr,
.len = len
};
int retry = 0, peer;
retry:
#ifdef RSOCK_WAIT_BEFORE_BLOCKING
rb_io_wait(fptr->self, RB_INT2NUM(RUBY_IO_READABLE), Qnil);
#endif
peer = (int)BLOCKING_REGION_FD(accept_blocking, &accept_arg);
if (peer < 0) {
int error = errno;
switch (error) {
case EMFILE:
case ENFILE:
case ENOMEM:
if (retry) break;
rb_gc();
retry = 1;
goto retry;
default:
if (!rb_io_maybe_wait_readable(error, io, RUBY_IO_TIMEOUT_DEFAULT)) break;
retry = 0;
goto retry;
}
rb_syserr_fail(error, "accept(2)");
}
rb_update_max_fd(peer);
if (!klass) return INT2NUM(peer);
return rsock_init_sock(rb_obj_alloc(klass), peer);
}
int
rsock_getfamily(rb_io_t *fptr)
{
union_sockaddr ss;
socklen_t sslen = (socklen_t)sizeof(ss);
int cached = fptr->mode & FMODE_SOCK;
if (cached) {
switch (cached) {
#ifdef AF_UNIX
case FMODE_UNIX: return AF_UNIX;
#endif
case FMODE_INET: return AF_INET;
case FMODE_INET6: return AF_INET6;
}
}
ss.addr.sa_family = AF_UNSPEC;
if (getsockname(fptr->fd, &ss.addr, &sslen) < 0)
return AF_UNSPEC;
switch (ss.addr.sa_family) {
#ifdef AF_UNIX
case AF_UNIX: fptr->mode |= FMODE_UNIX; break;
#endif
case AF_INET: fptr->mode |= FMODE_INET; break;
case AF_INET6: fptr->mode |= FMODE_INET6; break;
}
return ss.addr.sa_family;
}
static VALUE
sock_resolv_error_code(VALUE self)
{
return rb_attr_get(self, id_error_code);
}
void
rsock_init_socket_init(void)
{
/*
* SocketError is the error class for socket.
*/
rb_eSocket = rb_define_class("SocketError", rb_eStandardError);
rb_eResolution = rb_define_class_under(rb_cSocket, "ResolutionError", rb_eSocket);
rb_define_method(rb_eResolution, "error_code", sock_resolv_error_code, 0);
rsock_init_ipsocket();
rsock_init_tcpsocket();
rsock_init_tcpserver();
rsock_init_sockssocket();
rsock_init_udpsocket();
rsock_init_unixsocket();
rsock_init_unixserver();
rsock_init_sockopt();
rsock_init_ancdata();
rsock_init_addrinfo();
rsock_init_sockifaddr();
rsock_init_socket_constants();
id_error_code = rb_intern_const("error_code");
#undef rb_intern
sym_wait_readable = ID2SYM(rb_intern("wait_readable"));
#if MSG_DONTWAIT_RELIABLE
sym_wait_writable = ID2SYM(rb_intern("wait_writable"));
#endif
}
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