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udp.c
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udp.c
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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "uv.h"
#include "internal.h"
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#if defined(__MVS__)
#include <xti.h>
#endif
#include <sys/un.h>
#if defined(IPV6_JOIN_GROUP) && !defined(IPV6_ADD_MEMBERSHIP)
# define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
#endif
#if defined(IPV6_LEAVE_GROUP) && !defined(IPV6_DROP_MEMBERSHIP)
# define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
#endif
static void uv__udp_run_completed(uv_udp_t* handle);
static void uv__udp_io(uv_loop_t* loop, uv__io_t* w, unsigned int revents);
static void uv__udp_recvmsg(uv_udp_t* handle);
static void uv__udp_sendmsg(uv_udp_t* handle);
static int uv__udp_maybe_deferred_bind(uv_udp_t* handle,
int domain,
unsigned int flags);
void uv__udp_close(uv_udp_t* handle) {
uv__io_close(handle->loop, &handle->io_watcher);
uv__handle_stop(handle);
if (handle->io_watcher.fd != -1) {
uv__close(handle->io_watcher.fd);
handle->io_watcher.fd = -1;
}
}
void uv__udp_finish_close(uv_udp_t* handle) {
uv_udp_send_t* req;
struct uv__queue* q;
assert(!uv__io_active(&handle->io_watcher, POLLIN | POLLOUT));
assert(handle->io_watcher.fd == -1);
while (!uv__queue_empty(&handle->write_queue)) {
q = uv__queue_head(&handle->write_queue);
uv__queue_remove(q);
req = uv__queue_data(q, uv_udp_send_t, queue);
req->status = UV_ECANCELED;
uv__queue_insert_tail(&handle->write_completed_queue, &req->queue);
}
uv__udp_run_completed(handle);
assert(handle->send_queue_size == 0);
assert(handle->send_queue_count == 0);
/* Now tear down the handle. */
handle->recv_cb = NULL;
handle->alloc_cb = NULL;
/* but _do not_ touch close_cb */
}
static void uv__udp_run_completed(uv_udp_t* handle) {
uv_udp_send_t* req;
struct uv__queue* q;
assert(!(handle->flags & UV_HANDLE_UDP_PROCESSING));
handle->flags |= UV_HANDLE_UDP_PROCESSING;
while (!uv__queue_empty(&handle->write_completed_queue)) {
q = uv__queue_head(&handle->write_completed_queue);
uv__queue_remove(q);
req = uv__queue_data(q, uv_udp_send_t, queue);
uv__req_unregister(handle->loop, req);
handle->send_queue_size -= uv__count_bufs(req->bufs, req->nbufs);
handle->send_queue_count--;
if (req->bufs != req->bufsml)
uv__free(req->bufs);
req->bufs = NULL;
if (req->send_cb == NULL)
continue;
/* req->status >= 0 == bytes written
* req->status < 0 == errno
*/
if (req->status >= 0)
req->send_cb(req, 0);
else
req->send_cb(req, req->status);
}
if (uv__queue_empty(&handle->write_queue)) {
/* Pending queue and completion queue empty, stop watcher. */
uv__io_stop(handle->loop, &handle->io_watcher, POLLOUT);
if (!uv__io_active(&handle->io_watcher, POLLIN))
uv__handle_stop(handle);
}
handle->flags &= ~UV_HANDLE_UDP_PROCESSING;
}
static void uv__udp_io(uv_loop_t* loop, uv__io_t* w, unsigned int revents) {
uv_udp_t* handle;
handle = container_of(w, uv_udp_t, io_watcher);
assert(handle->type == UV_UDP);
if (revents & POLLIN)
uv__udp_recvmsg(handle);
if (revents & POLLOUT) {
uv__udp_sendmsg(handle);
uv__udp_run_completed(handle);
}
}
static int uv__udp_recvmmsg(uv_udp_t* handle, uv_buf_t* buf) {
#if defined(__linux__) || defined(__FreeBSD__)
struct sockaddr_in6 peers[20];
struct iovec iov[ARRAY_SIZE(peers)];
struct mmsghdr msgs[ARRAY_SIZE(peers)];
ssize_t nread;
uv_buf_t chunk_buf;
size_t chunks;
int flags;
size_t k;
/* prepare structures for recvmmsg */
chunks = buf->len / UV__UDP_DGRAM_MAXSIZE;
if (chunks > ARRAY_SIZE(iov))
chunks = ARRAY_SIZE(iov);
for (k = 0; k < chunks; ++k) {
iov[k].iov_base = buf->base + k * UV__UDP_DGRAM_MAXSIZE;
iov[k].iov_len = UV__UDP_DGRAM_MAXSIZE;
memset(&msgs[k].msg_hdr, 0, sizeof(msgs[k].msg_hdr));
msgs[k].msg_hdr.msg_iov = iov + k;
msgs[k].msg_hdr.msg_iovlen = 1;
msgs[k].msg_hdr.msg_name = peers + k;
msgs[k].msg_hdr.msg_namelen = sizeof(peers[0]);
msgs[k].msg_hdr.msg_control = NULL;
msgs[k].msg_hdr.msg_controllen = 0;
msgs[k].msg_hdr.msg_flags = 0;
}
do
nread = recvmmsg(handle->io_watcher.fd, msgs, chunks, 0, NULL);
while (nread == -1 && errno == EINTR);
if (nread < 1) {
if (nread == 0 || errno == EAGAIN || errno == EWOULDBLOCK)
handle->recv_cb(handle, 0, buf, NULL, 0);
else
handle->recv_cb(handle, UV__ERR(errno), buf, NULL, 0);
} else {
/* pass each chunk to the application */
for (k = 0; k < (size_t) nread && handle->recv_cb != NULL; k++) {
flags = UV_UDP_MMSG_CHUNK;
if (msgs[k].msg_hdr.msg_flags & MSG_TRUNC)
flags |= UV_UDP_PARTIAL;
chunk_buf = uv_buf_init(iov[k].iov_base, iov[k].iov_len);
handle->recv_cb(handle,
msgs[k].msg_len,
&chunk_buf,
msgs[k].msg_hdr.msg_name,
flags);
}
/* one last callback so the original buffer is freed */
if (handle->recv_cb != NULL)
handle->recv_cb(handle, 0, buf, NULL, UV_UDP_MMSG_FREE);
}
return nread;
#else /* __linux__ || ____FreeBSD__ */
return UV_ENOSYS;
#endif /* __linux__ || ____FreeBSD__ */
}
static void uv__udp_recvmsg(uv_udp_t* handle) {
struct sockaddr_storage peer;
struct msghdr h;
ssize_t nread;
uv_buf_t buf;
int flags;
int count;
assert(handle->recv_cb != NULL);
assert(handle->alloc_cb != NULL);
/* Prevent loop starvation when the data comes in as fast as (or faster than)
* we can read it. XXX Need to rearm fd if we switch to edge-triggered I/O.
*/
count = 32;
do {
buf = uv_buf_init(NULL, 0);
handle->alloc_cb((uv_handle_t*) handle, UV__UDP_DGRAM_MAXSIZE, &buf);
if (buf.base == NULL || buf.len == 0) {
handle->recv_cb(handle, UV_ENOBUFS, &buf, NULL, 0);
return;
}
assert(buf.base != NULL);
if (uv_udp_using_recvmmsg(handle)) {
nread = uv__udp_recvmmsg(handle, &buf);
if (nread > 0)
count -= nread;
continue;
}
memset(&h, 0, sizeof(h));
memset(&peer, 0, sizeof(peer));
h.msg_name = &peer;
h.msg_namelen = sizeof(peer);
h.msg_iov = (void*) &buf;
h.msg_iovlen = 1;
do {
nread = recvmsg(handle->io_watcher.fd, &h, 0);
}
while (nread == -1 && errno == EINTR);
if (nread == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK)
handle->recv_cb(handle, 0, &buf, NULL, 0);
else
handle->recv_cb(handle, UV__ERR(errno), &buf, NULL, 0);
}
else {
flags = 0;
if (h.msg_flags & MSG_TRUNC)
flags |= UV_UDP_PARTIAL;
handle->recv_cb(handle, nread, &buf, (const struct sockaddr*) &peer, flags);
}
count--;
}
/* recv_cb callback may decide to pause or close the handle */
while (nread != -1
&& count > 0
&& handle->io_watcher.fd != -1
&& handle->recv_cb != NULL);
}
static void uv__udp_sendmsg(uv_udp_t* handle) {
#if defined(__linux__) || defined(__FreeBSD__)
uv_udp_send_t* req;
struct mmsghdr h[20];
struct mmsghdr* p;
struct uv__queue* q;
ssize_t npkts;
size_t pkts;
size_t i;
if (uv__queue_empty(&handle->write_queue))
return;
write_queue_drain:
for (pkts = 0, q = uv__queue_head(&handle->write_queue);
pkts < ARRAY_SIZE(h) && q != &handle->write_queue;
++pkts, q = uv__queue_head(q)) {
assert(q != NULL);
req = uv__queue_data(q, uv_udp_send_t, queue);
assert(req != NULL);
p = &h[pkts];
memset(p, 0, sizeof(*p));
if (req->addr.ss_family == AF_UNSPEC) {
p->msg_hdr.msg_name = NULL;
p->msg_hdr.msg_namelen = 0;
} else {
p->msg_hdr.msg_name = &req->addr;
if (req->addr.ss_family == AF_INET6)
p->msg_hdr.msg_namelen = sizeof(struct sockaddr_in6);
else if (req->addr.ss_family == AF_INET)
p->msg_hdr.msg_namelen = sizeof(struct sockaddr_in);
else if (req->addr.ss_family == AF_UNIX)
p->msg_hdr.msg_namelen = sizeof(struct sockaddr_un);
else {
assert(0 && "unsupported address family");
abort();
}
}
h[pkts].msg_hdr.msg_iov = (struct iovec*) req->bufs;
h[pkts].msg_hdr.msg_iovlen = req->nbufs;
}
do
npkts = sendmmsg(handle->io_watcher.fd, h, pkts, 0);
while (npkts == -1 && errno == EINTR);
if (npkts < 1) {
if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ENOBUFS)
return;
for (i = 0, q = uv__queue_head(&handle->write_queue);
i < pkts && q != &handle->write_queue;
++i, q = uv__queue_head(&handle->write_queue)) {
assert(q != NULL);
req = uv__queue_data(q, uv_udp_send_t, queue);
assert(req != NULL);
req->status = UV__ERR(errno);
uv__queue_remove(&req->queue);
uv__queue_insert_tail(&handle->write_completed_queue, &req->queue);
}
uv__io_feed(handle->loop, &handle->io_watcher);
return;
}
/* Safety: npkts known to be >0 below. Hence cast from ssize_t
* to size_t safe.
*/
for (i = 0, q = uv__queue_head(&handle->write_queue);
i < (size_t)npkts && q != &handle->write_queue;
++i, q = uv__queue_head(&handle->write_queue)) {
assert(q != NULL);
req = uv__queue_data(q, uv_udp_send_t, queue);
assert(req != NULL);
req->status = req->bufs[0].len;
/* Sending a datagram is an atomic operation: either all data
* is written or nothing is (and EMSGSIZE is raised). That is
* why we don't handle partial writes. Just pop the request
* off the write queue and onto the completed queue, done.
*/
uv__queue_remove(&req->queue);
uv__queue_insert_tail(&handle->write_completed_queue, &req->queue);
}
/* couldn't batch everything, continue sending (jump to avoid stack growth) */
if (!uv__queue_empty(&handle->write_queue))
goto write_queue_drain;
uv__io_feed(handle->loop, &handle->io_watcher);
#else /* __linux__ || ____FreeBSD__ */
uv_udp_send_t* req;
struct msghdr h;
struct uv__queue* q;
ssize_t size;
while (!uv__queue_empty(&handle->write_queue)) {
q = uv__queue_head(&handle->write_queue);
assert(q != NULL);
req = uv__queue_data(q, uv_udp_send_t, queue);
assert(req != NULL);
memset(&h, 0, sizeof h);
if (req->addr.ss_family == AF_UNSPEC) {
h.msg_name = NULL;
h.msg_namelen = 0;
} else {
h.msg_name = &req->addr;
if (req->addr.ss_family == AF_INET6)
h.msg_namelen = sizeof(struct sockaddr_in6);
else if (req->addr.ss_family == AF_INET)
h.msg_namelen = sizeof(struct sockaddr_in);
else if (req->addr.ss_family == AF_UNIX)
h.msg_namelen = sizeof(struct sockaddr_un);
else {
assert(0 && "unsupported address family");
abort();
}
}
h.msg_iov = (struct iovec*) req->bufs;
h.msg_iovlen = req->nbufs;
do {
size = sendmsg(handle->io_watcher.fd, &h, 0);
} while (size == -1 && errno == EINTR);
if (size == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ENOBUFS)
break;
}
req->status = (size == -1 ? UV__ERR(errno) : size);
/* Sending a datagram is an atomic operation: either all data
* is written or nothing is (and EMSGSIZE is raised). That is
* why we don't handle partial writes. Just pop the request
* off the write queue and onto the completed queue, done.
*/
uv__queue_remove(&req->queue);
uv__queue_insert_tail(&handle->write_completed_queue, &req->queue);
uv__io_feed(handle->loop, &handle->io_watcher);
}
#endif /* __linux__ || ____FreeBSD__ */
}
/* On the BSDs, SO_REUSEPORT implies SO_REUSEADDR but with some additional
* refinements for programs that use multicast.
*
* Linux as of 3.9 has a SO_REUSEPORT socket option but with semantics that
* are different from the BSDs: it _shares_ the port rather than steal it
* from the current listener. While useful, it's not something we can emulate
* on other platforms so we don't enable it.
*
* zOS does not support getsockname with SO_REUSEPORT option when using
* AF_UNIX.
*/
static int uv__set_reuse(int fd) {
int yes;
yes = 1;
#if defined(SO_REUSEPORT) && defined(__MVS__)
struct sockaddr_in sockfd;
unsigned int sockfd_len = sizeof(sockfd);
if (getsockname(fd, (struct sockaddr*) &sockfd, &sockfd_len) == -1)
return UV__ERR(errno);
if (sockfd.sin_family == AF_UNIX) {
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)))
return UV__ERR(errno);
} else {
if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes)))
return UV__ERR(errno);
}
#elif defined(SO_REUSEPORT) && !defined(__linux__) && !defined(__GNU__) && \
!defined(__sun__)
if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes)))
return UV__ERR(errno);
#else
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)))
return UV__ERR(errno);
#endif
return 0;
}
/*
* The Linux kernel suppresses some ICMP error messages by default for UDP
* sockets. Setting IP_RECVERR/IPV6_RECVERR on the socket enables full ICMP
* error reporting, hopefully resulting in faster failover to working name
* servers.
*/
static int uv__set_recverr(int fd, sa_family_t ss_family) {
#if defined(__linux__)
int yes;
yes = 1;
if (ss_family == AF_INET) {
if (setsockopt(fd, IPPROTO_IP, IP_RECVERR, &yes, sizeof(yes)))
return UV__ERR(errno);
} else if (ss_family == AF_INET6) {
if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVERR, &yes, sizeof(yes)))
return UV__ERR(errno);
}
#endif
return 0;
}
int uv__udp_bind(uv_udp_t* handle,
const struct sockaddr* addr,
unsigned int addrlen,
unsigned int flags) {
int err;
int yes;
int fd;
/* Check for bad flags. */
if (flags & ~(UV_UDP_IPV6ONLY | UV_UDP_REUSEADDR | UV_UDP_LINUX_RECVERR))
return UV_EINVAL;
/* Cannot set IPv6-only mode on non-IPv6 socket. */
if ((flags & UV_UDP_IPV6ONLY) && addr->sa_family != AF_INET6)
return UV_EINVAL;
fd = handle->io_watcher.fd;
if (fd == -1) {
err = uv__socket(addr->sa_family, SOCK_DGRAM, 0);
if (err < 0)
return err;
fd = err;
handle->io_watcher.fd = fd;
}
if (flags & UV_UDP_LINUX_RECVERR) {
err = uv__set_recverr(fd, addr->sa_family);
if (err)
return err;
}
if (flags & UV_UDP_REUSEADDR) {
err = uv__set_reuse(fd);
if (err)
return err;
}
if (flags & UV_UDP_IPV6ONLY) {
#ifdef IPV6_V6ONLY
yes = 1;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof yes) == -1) {
err = UV__ERR(errno);
return err;
}
#else
err = UV_ENOTSUP;
return err;
#endif
}
if (bind(fd, addr, addrlen)) {
err = UV__ERR(errno);
if (errno == EAFNOSUPPORT)
/* OSX, other BSDs and SunoS fail with EAFNOSUPPORT when binding a
* socket created with AF_INET to an AF_INET6 address or vice versa. */
err = UV_EINVAL;
return err;
}
if (addr->sa_family == AF_INET6)
handle->flags |= UV_HANDLE_IPV6;
handle->flags |= UV_HANDLE_BOUND;
return 0;
}
static int uv__udp_maybe_deferred_bind(uv_udp_t* handle,
int domain,
unsigned int flags) {
union uv__sockaddr taddr;
socklen_t addrlen;
if (handle->io_watcher.fd != -1)
return 0;
switch (domain) {
case AF_INET:
{
struct sockaddr_in* addr = &taddr.in;
memset(addr, 0, sizeof *addr);
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = INADDR_ANY;
addrlen = sizeof *addr;
break;
}
case AF_INET6:
{
struct sockaddr_in6* addr = &taddr.in6;
memset(addr, 0, sizeof *addr);
addr->sin6_family = AF_INET6;
addr->sin6_addr = in6addr_any;
addrlen = sizeof *addr;
break;
}
default:
assert(0 && "unsupported address family");
abort();
}
return uv__udp_bind(handle, &taddr.addr, addrlen, flags);
}
int uv__udp_connect(uv_udp_t* handle,
const struct sockaddr* addr,
unsigned int addrlen) {
int err;
err = uv__udp_maybe_deferred_bind(handle, addr->sa_family, 0);
if (err)
return err;
do {
errno = 0;
err = connect(handle->io_watcher.fd, addr, addrlen);
} while (err == -1 && errno == EINTR);
if (err)
return UV__ERR(errno);
handle->flags |= UV_HANDLE_UDP_CONNECTED;
return 0;
}
/* From https://pubs.opengroup.org/onlinepubs/9699919799/functions/connect.html
* Any of uv supported UNIXs kernel should be standardized, but the kernel
* implementation logic not same, let's use pseudocode to explain the udp
* disconnect behaviors:
*
* Predefined stubs for pseudocode:
* 1. sodisconnect: The function to perform the real udp disconnect
* 2. pru_connect: The function to perform the real udp connect
* 3. so: The kernel object match with socket fd
* 4. addr: The sockaddr parameter from user space
*
* BSDs:
* if(sodisconnect(so) == 0) { // udp disconnect succeed
* if (addr->sa_len != so->addr->sa_len) return EINVAL;
* if (addr->sa_family != so->addr->sa_family) return EAFNOSUPPORT;
* pru_connect(so);
* }
* else return EISCONN;
*
* z/OS (same with Windows):
* if(addr->sa_len < so->addr->sa_len) return EINVAL;
* if (addr->sa_family == AF_UNSPEC) sodisconnect(so);
*
* AIX:
* if(addr->sa_len != sizeof(struct sockaddr)) return EINVAL; // ignore ip proto version
* if (addr->sa_family == AF_UNSPEC) sodisconnect(so);
*
* Linux,Others:
* if(addr->sa_len < sizeof(struct sockaddr)) return EINVAL;
* if (addr->sa_family == AF_UNSPEC) sodisconnect(so);
*/
int uv__udp_disconnect(uv_udp_t* handle) {
int r;
#if defined(__MVS__)
struct sockaddr_storage addr;
#else
struct sockaddr addr;
#endif
memset(&addr, 0, sizeof(addr));
#if defined(__MVS__)
addr.ss_family = AF_UNSPEC;
#else
addr.sa_family = AF_UNSPEC;
#endif
do {
errno = 0;
#ifdef __PASE__
/* On IBMi a connectionless transport socket can be disconnected by
* either setting the addr parameter to NULL or setting the
* addr_length parameter to zero, and issuing another connect().
* https://www.ibm.com/docs/en/i/7.4?topic=ssw_ibm_i_74/apis/connec.htm
*/
r = connect(handle->io_watcher.fd, (struct sockaddr*) NULL, 0);
#else
r = connect(handle->io_watcher.fd, (struct sockaddr*) &addr, sizeof(addr));
#endif
} while (r == -1 && errno == EINTR);
if (r == -1) {
#if defined(BSD) /* The macro BSD is from sys/param.h */
if (errno != EAFNOSUPPORT && errno != EINVAL)
return UV__ERR(errno);
#else
return UV__ERR(errno);
#endif
}
handle->flags &= ~UV_HANDLE_UDP_CONNECTED;
return 0;
}
int uv__udp_send(uv_udp_send_t* req,
uv_udp_t* handle,
const uv_buf_t bufs[],
unsigned int nbufs,
const struct sockaddr* addr,
unsigned int addrlen,
uv_udp_send_cb send_cb) {
int err;
int empty_queue;
assert(nbufs > 0);
if (addr) {
err = uv__udp_maybe_deferred_bind(handle, addr->sa_family, 0);
if (err)
return err;
}
/* It's legal for send_queue_count > 0 even when the write_queue is empty;
* it means there are error-state requests in the write_completed_queue that
* will touch up send_queue_size/count later.
*/
empty_queue = (handle->send_queue_count == 0);
uv__req_init(handle->loop, req, UV_UDP_SEND);
assert(addrlen <= sizeof(req->addr));
if (addr == NULL)
req->addr.ss_family = AF_UNSPEC;
else
memcpy(&req->addr, addr, addrlen);
req->send_cb = send_cb;
req->handle = handle;
req->nbufs = nbufs;
req->bufs = req->bufsml;
if (nbufs > ARRAY_SIZE(req->bufsml))
req->bufs = uv__malloc(nbufs * sizeof(bufs[0]));
if (req->bufs == NULL) {
uv__req_unregister(handle->loop, req);
return UV_ENOMEM;
}
memcpy(req->bufs, bufs, nbufs * sizeof(bufs[0]));
handle->send_queue_size += uv__count_bufs(req->bufs, req->nbufs);
handle->send_queue_count++;
uv__queue_insert_tail(&handle->write_queue, &req->queue);
uv__handle_start(handle);
if (empty_queue && !(handle->flags & UV_HANDLE_UDP_PROCESSING)) {
uv__udp_sendmsg(handle);
/* `uv__udp_sendmsg` may not be able to do non-blocking write straight
* away. In such cases the `io_watcher` has to be queued for asynchronous
* write.
*/
if (!uv__queue_empty(&handle->write_queue))
uv__io_start(handle->loop, &handle->io_watcher, POLLOUT);
} else {
uv__io_start(handle->loop, &handle->io_watcher, POLLOUT);
}
return 0;
}
int uv__udp_try_send(uv_udp_t* handle,
const uv_buf_t bufs[],
unsigned int nbufs,
const struct sockaddr* addr,
unsigned int addrlen) {
int err;
struct msghdr h;
ssize_t size;
assert(nbufs > 0);
/* already sending a message */
if (handle->send_queue_count != 0)
return UV_EAGAIN;
if (addr) {
err = uv__udp_maybe_deferred_bind(handle, addr->sa_family, 0);
if (err)
return err;
} else {
assert(handle->flags & UV_HANDLE_UDP_CONNECTED);
}
memset(&h, 0, sizeof h);
h.msg_name = (struct sockaddr*) addr;
h.msg_namelen = addrlen;
h.msg_iov = (struct iovec*) bufs;
h.msg_iovlen = nbufs;
do {
size = sendmsg(handle->io_watcher.fd, &h, 0);
} while (size == -1 && errno == EINTR);
if (size == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ENOBUFS)
return UV_EAGAIN;
else
return UV__ERR(errno);
}
return size;
}
static int uv__udp_set_membership4(uv_udp_t* handle,
const struct sockaddr_in* multicast_addr,
const char* interface_addr,
uv_membership membership) {
struct ip_mreq mreq;
int optname;
int err;
memset(&mreq, 0, sizeof mreq);
if (interface_addr) {
err = uv_inet_pton(AF_INET, interface_addr, &mreq.imr_interface.s_addr);
if (err)
return err;
} else {
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
}
mreq.imr_multiaddr.s_addr = multicast_addr->sin_addr.s_addr;
switch (membership) {
case UV_JOIN_GROUP:
optname = IP_ADD_MEMBERSHIP;
break;
case UV_LEAVE_GROUP:
optname = IP_DROP_MEMBERSHIP;
break;
default:
return UV_EINVAL;
}
if (setsockopt(handle->io_watcher.fd,
IPPROTO_IP,
optname,
&mreq,
sizeof(mreq))) {
#if defined(__MVS__)
if (errno == ENXIO)
return UV_ENODEV;
#endif
return UV__ERR(errno);
}
return 0;
}
static int uv__udp_set_membership6(uv_udp_t* handle,
const struct sockaddr_in6* multicast_addr,
const char* interface_addr,
uv_membership membership) {
int optname;
struct ipv6_mreq mreq;
struct sockaddr_in6 addr6;
memset(&mreq, 0, sizeof mreq);
if (interface_addr) {
if (uv_ip6_addr(interface_addr, 0, &addr6))
return UV_EINVAL;
mreq.ipv6mr_interface = addr6.sin6_scope_id;
} else {
mreq.ipv6mr_interface = 0;
}
mreq.ipv6mr_multiaddr = multicast_addr->sin6_addr;
switch (membership) {
case UV_JOIN_GROUP:
optname = IPV6_ADD_MEMBERSHIP;
break;
case UV_LEAVE_GROUP:
optname = IPV6_DROP_MEMBERSHIP;
break;
default:
return UV_EINVAL;
}
if (setsockopt(handle->io_watcher.fd,
IPPROTO_IPV6,
optname,
&mreq,
sizeof(mreq))) {
#if defined(__MVS__)
if (errno == ENXIO)
return UV_ENODEV;
#endif
return UV__ERR(errno);
}
return 0;
}
#if !defined(__OpenBSD__) && \
!defined(__NetBSD__) && \
!defined(__ANDROID__) && \
!defined(__DragonFly__) && \
!defined(__QNX__) && \
!defined(__GNU__)
static int uv__udp_set_source_membership4(uv_udp_t* handle,
const struct sockaddr_in* multicast_addr,
const char* interface_addr,
const struct sockaddr_in* source_addr,
uv_membership membership) {
struct ip_mreq_source mreq;
int optname;
int err;
err = uv__udp_maybe_deferred_bind(handle, AF_INET, UV_UDP_REUSEADDR);
if (err)
return err;
memset(&mreq, 0, sizeof(mreq));
if (interface_addr != NULL) {
err = uv_inet_pton(AF_INET, interface_addr, &mreq.imr_interface.s_addr);
if (err)
return err;
} else {
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
}
mreq.imr_multiaddr.s_addr = multicast_addr->sin_addr.s_addr;
mreq.imr_sourceaddr.s_addr = source_addr->sin_addr.s_addr;
if (membership == UV_JOIN_GROUP)
optname = IP_ADD_SOURCE_MEMBERSHIP;
else if (membership == UV_LEAVE_GROUP)
optname = IP_DROP_SOURCE_MEMBERSHIP;
else
return UV_EINVAL;
if (setsockopt(handle->io_watcher.fd,
IPPROTO_IP,
optname,
&mreq,
sizeof(mreq))) {
return UV__ERR(errno);
}
return 0;
}
static int uv__udp_set_source_membership6(uv_udp_t* handle,
const struct sockaddr_in6* multicast_addr,
const char* interface_addr,
const struct sockaddr_in6* source_addr,
uv_membership membership) {
struct group_source_req mreq;
struct sockaddr_in6 addr6;
int optname;
int err;
err = uv__udp_maybe_deferred_bind(handle, AF_INET6, UV_UDP_REUSEADDR);
if (err)
return err;
memset(&mreq, 0, sizeof(mreq));
if (interface_addr != NULL) {
err = uv_ip6_addr(interface_addr, 0, &addr6);
if (err)
return err;
mreq.gsr_interface = addr6.sin6_scope_id;
} else {
mreq.gsr_interface = 0;
}
STATIC_ASSERT(sizeof(mreq.gsr_group) >= sizeof(*multicast_addr));
STATIC_ASSERT(sizeof(mreq.gsr_source) >= sizeof(*source_addr));
memcpy(&mreq.gsr_group, multicast_addr, sizeof(*multicast_addr));
memcpy(&mreq.gsr_source, source_addr, sizeof(*source_addr));
if (membership == UV_JOIN_GROUP)
optname = MCAST_JOIN_SOURCE_GROUP;
else if (membership == UV_LEAVE_GROUP)
optname = MCAST_LEAVE_SOURCE_GROUP;
else
return UV_EINVAL;
if (setsockopt(handle->io_watcher.fd,
IPPROTO_IPV6,
optname,
&mreq,
sizeof(mreq))) {
return UV__ERR(errno);
}
return 0;
}
#endif
int uv__udp_init_ex(uv_loop_t* loop,
uv_udp_t* handle,
unsigned flags,
int domain) {
int fd;
fd = -1;
if (domain != AF_UNSPEC) {
fd = uv__socket(domain, SOCK_DGRAM, 0);
if (fd < 0)