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05ef2980ee
libuv/src/unix/udp.c
Michael Dawson 05ef2980ee aix: fix setsockopt for multicast options 
On AIX the length of socket options
for multicast and ttl options is not always sizeof(char).

AIX has the same issue as solaris which was fixed under
PR-URL: https://github.com/libuv/libuv/pull/243

This PR extends the fix to cover AIX as well.

PR-URL: https://github.com/libuv/libuv/pull/345
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
2015-05-07 20:14:20 +02:00

834 lines
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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(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;
QUEUE* q;
assert(!uv__io_active(&handle->io_watcher, UV__POLLIN | UV__POLLOUT));
assert(handle->io_watcher.fd == -1);
while (!QUEUE_EMPTY(&handle->write_queue)) {
q = QUEUE_HEAD(&handle->write_queue);
QUEUE_REMOVE(q);
req = QUEUE_DATA(q, uv_udp_send_t, queue);
req->status = -ECANCELED;
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;
QUEUE* q;
while (!QUEUE_EMPTY(&handle->write_completed_queue)) {
q = QUEUE_HEAD(&handle->write_completed_queue);
QUEUE_REMOVE(q);
req = 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)
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 (QUEUE_EMPTY(&handle->write_queue)) {
/* Pending queue and completion queue empty, stop watcher. */
uv__io_stop(handle->loop, &handle->io_watcher, UV__POLLOUT);
if (!uv__io_active(&handle->io_watcher, UV__POLLIN))
uv__handle_stop(handle);
}
}
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 & UV__POLLIN)
uv__udp_recvmsg(handle);
if (revents & UV__POLLOUT) {
uv__udp_sendmsg(handle);
uv__udp_run_completed(handle);
}
}
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;
memset(&h, 0, sizeof(h));
h.msg_name = &peer;
do {
handle->alloc_cb((uv_handle_t*) handle, 64 * 1024, &buf);
if (buf.len == 0) {
handle->recv_cb(handle, UV_ENOBUFS, &buf, NULL, 0);
return;
}
assert(buf.base != NULL);
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, -errno, &buf, NULL, 0);
}
else {
const struct sockaddr *addr;
if (h.msg_namelen == 0)
addr = NULL;
else
addr = (const struct sockaddr*) &peer;
flags = 0;
if (h.msg_flags & MSG_TRUNC)
flags |= UV_UDP_PARTIAL;
handle->recv_cb(handle, nread, &buf, addr, flags);
}
}
/* 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) {
uv_udp_send_t* req;
QUEUE* q;
struct msghdr h;
ssize_t size;
while (!QUEUE_EMPTY(&handle->write_queue)) {
q = QUEUE_HEAD(&handle->write_queue);
assert(q != NULL);
req = QUEUE_DATA(q, uv_udp_send_t, queue);
assert(req != NULL);
memset(&h, 0, sizeof h);
h.msg_name = &req->addr;
h.msg_namelen = (req->addr.ss_family == AF_INET6 ?
sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in));
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 && (errno == EAGAIN || errno == EWOULDBLOCK))
break;
req->status = (size == -1 ? -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.
*/
QUEUE_REMOVE(&req->queue);
QUEUE_INSERT_TAIL(&handle->write_completed_queue, &req->queue);
uv__io_feed(handle->loop, &handle->io_watcher);
}
}
/* 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.
*/
static int uv__set_reuse(int fd) {
int yes;
#if defined(SO_REUSEPORT) && !defined(__linux__)
yes = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes)))
return -errno;
#else
yes = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)))
return -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))
return -EINVAL;
/* Cannot set IPv6-only mode on non-IPv6 socket. */
if ((flags & UV_UDP_IPV6ONLY) && addr->sa_family != AF_INET6)
return -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_REUSEADDR) {
err = uv__set_reuse(fd);
if (err)
goto out;
}
if (flags & UV_UDP_IPV6ONLY) {
#ifdef IPV6_V6ONLY
yes = 1;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof yes) == -1) {
err = -errno;
goto out;
}
#else
err = -ENOTSUP;
goto out;
#endif
}
if (bind(fd, addr, addrlen)) {
err = -errno;
goto out;
}
if (addr->sa_family == AF_INET6)
handle->flags |= UV_HANDLE_IPV6;
return 0;
out:
uv__close(handle->io_watcher.fd);
handle->io_watcher.fd = -1;
return err;
}
static int uv__udp_maybe_deferred_bind(uv_udp_t* handle,
int domain,
unsigned int flags) {
unsigned char taddr[sizeof(struct sockaddr_in6)];
socklen_t addrlen;
if (handle->io_watcher.fd != -1)
return 0;
switch (domain) {
case AF_INET:
{
struct sockaddr_in* addr = (void*)&taddr;
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 = (void*)&taddr;
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, (const struct sockaddr*) &taddr, addrlen, flags);
}
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);
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));
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 = malloc(nbufs * sizeof(bufs[0]));
if (req->bufs == NULL)
return -ENOMEM;
memcpy(req->bufs, bufs, nbufs * sizeof(bufs[0]));
handle->send_queue_size += uv__count_bufs(req->bufs, req->nbufs);
handle->send_queue_count++;
QUEUE_INSERT_TAIL(&handle->write_queue, &req->queue);
uv__handle_start(handle);
if (empty_queue)
uv__udp_sendmsg(handle);
else
uv__io_start(handle->loop, &handle->io_watcher, UV__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 -EAGAIN;
err = uv__udp_maybe_deferred_bind(handle, addr->sa_family, 0);
if (err)
return err;
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)
return -EAGAIN;
else
return -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 -EINVAL;
}
if (setsockopt(handle->io_watcher.fd,
IPPROTO_IP,
optname,
&mreq,
sizeof(mreq))) {
return -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 -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 -EINVAL;
}
if (setsockopt(handle->io_watcher.fd,
IPPROTO_IPV6,
optname,
&mreq,
sizeof(mreq))) {
return -errno;
}
return 0;
}
int uv_udp_init(uv_loop_t* loop, uv_udp_t* handle) {
uv__handle_init(loop, (uv_handle_t*)handle, UV_UDP);
handle->alloc_cb = NULL;
handle->recv_cb = NULL;
handle->send_queue_size = 0;
handle->send_queue_count = 0;
uv__io_init(&handle->io_watcher, uv__udp_io, -1);
QUEUE_INIT(&handle->write_queue);
QUEUE_INIT(&handle->write_completed_queue);
return 0;
}
int uv_udp_open(uv_udp_t* handle, uv_os_sock_t sock) {
int err;
/* Check for already active socket. */
if (handle->io_watcher.fd != -1)
return -EALREADY; /* FIXME(bnoordhuis) Should be -EBUSY. */
err = uv__nonblock(sock, 1);
if (err)
return err;
err = uv__set_reuse(sock);
if (err)
return err;
handle->io_watcher.fd = sock;
return 0;
}
int uv_udp_set_membership(uv_udp_t* handle,
const char* multicast_addr,
const char* interface_addr,
uv_membership membership) {
int err;
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
if (uv_ip4_addr(multicast_addr, 0, &addr4) == 0) {
err = uv__udp_maybe_deferred_bind(handle, AF_INET, UV_UDP_REUSEADDR);
if (err)
return err;
return uv__udp_set_membership4(handle, &addr4, interface_addr, membership);
} else if (uv_ip6_addr(multicast_addr, 0, &addr6) == 0) {
err = uv__udp_maybe_deferred_bind(handle, AF_INET6, UV_UDP_REUSEADDR);
if (err)
return err;
return uv__udp_set_membership6(handle, &addr6, interface_addr, membership);
} else {
return -EINVAL;
}
}
static int uv__setsockopt(uv_udp_t* handle,
int option4,
int option6,
const void* val,
size_t size) {
int r;
if (handle->flags & UV_HANDLE_IPV6)
r = setsockopt(handle->io_watcher.fd,
IPPROTO_IPV6,
option6,
val,
size);
else
r = setsockopt(handle->io_watcher.fd,
IPPROTO_IP,
option4,
val,
size);
if (r)
return -errno;
return 0;
}
static int uv__setsockopt_maybe_char(uv_udp_t* handle,
int option4,
int option6,
int val) {
#if defined(__sun) || defined(_AIX)
char arg = val;
#else
int arg = val;
#endif
if (val < 0 || val > 255)
return -EINVAL;
return uv__setsockopt(handle, option4, option6, &arg, sizeof(arg));
}
int uv_udp_set_broadcast(uv_udp_t* handle, int on) {
if (setsockopt(handle->io_watcher.fd,
SOL_SOCKET,
SO_BROADCAST,
&on,
sizeof(on))) {
return -errno;
}
return 0;
}
int uv_udp_set_ttl(uv_udp_t* handle, int ttl) {
if (ttl < 1 || ttl > 255)
return -EINVAL;
/*
* On Solaris and derivatives such as SmartOS, the length of socket options
* is sizeof(int) for IP_TTL and IPV6_UNICAST_HOPS,
* so hardcode the size of these options on this platform,
* and use the general uv__setsockopt_maybe_char call on other platforms.
*/
#if defined(__sun) || defined(_AIX)
return uv__setsockopt(handle,
IP_TTL,
IPV6_UNICAST_HOPS,
&ttl,
sizeof(ttl));
#endif /* defined(__sun) || defined(_AIX) */
return uv__setsockopt_maybe_char(handle,
IP_TTL,
IPV6_UNICAST_HOPS,
ttl);
}
int uv_udp_set_multicast_ttl(uv_udp_t* handle, int ttl) {
/*
* On Solaris and derivatives such as SmartOS, the length of socket options
* is sizeof(int) for IPV6_MULTICAST_HOPS and sizeof(char) for
* IP_MULTICAST_TTL, so hardcode the size of the option in the IPv6 case,
* and use the general uv__setsockopt_maybe_char call otherwise.
*/
#if defined(__sun) || defined(_AIX)
if (handle->flags & UV_HANDLE_IPV6)
return uv__setsockopt(handle,
IP_MULTICAST_TTL,
IPV6_MULTICAST_HOPS,
&ttl,
sizeof(ttl));
#endif /* defined(__sun) || defined(_AIX) */
return uv__setsockopt_maybe_char(handle,
IP_MULTICAST_TTL,
IPV6_MULTICAST_HOPS,
ttl);
}
int uv_udp_set_multicast_loop(uv_udp_t* handle, int on) {
/*
* On Solaris and derivatives such as SmartOS, the length of socket options
* is sizeof(int) for IPV6_MULTICAST_LOOP and sizeof(char) for
* IP_MULTICAST_LOOP, so hardcode the size of the option in the IPv6 case,
* and use the general uv__setsockopt_maybe_char call otherwise.
*/
#if defined(__sun) || defined(_AIX)
if (handle->flags & UV_HANDLE_IPV6)
return uv__setsockopt(handle,
IP_MULTICAST_LOOP,
IPV6_MULTICAST_LOOP,
&on,
sizeof(on));
#endif /* defined(__sun) || defined(_AIX) */
return uv__setsockopt_maybe_char(handle,
IP_MULTICAST_LOOP,
IPV6_MULTICAST_LOOP,
on);
}
int uv_udp_set_multicast_interface(uv_udp_t* handle, const char* interface_addr) {
struct sockaddr_storage addr_st;
struct sockaddr_in* addr4;
struct sockaddr_in6* addr6;
addr4 = (struct sockaddr_in*) &addr_st;
addr6 = (struct sockaddr_in6*) &addr_st;
if (!interface_addr) {
memset(&addr_st, 0, sizeof addr_st);
if (handle->flags & UV_HANDLE_IPV6) {
addr_st.ss_family = AF_INET6;
addr6->sin6_scope_id = 0;
} else {
addr_st.ss_family = AF_INET;
addr4->sin_addr.s_addr = htonl(INADDR_ANY);
}
} else if (uv_ip4_addr(interface_addr, 0, addr4) == 0) {
/* nothing, address was parsed */
} else if (uv_ip6_addr(interface_addr, 0, addr6) == 0) {
/* nothing, address was parsed */
} else {
return -EINVAL;
}
if (addr_st.ss_family == AF_INET) {
if (setsockopt(handle->io_watcher.fd,
IPPROTO_IP,
IP_MULTICAST_IF,
(void*) &addr4->sin_addr,
sizeof(addr4->sin_addr)) == -1) {
return -errno;
}
} else if (addr_st.ss_family == AF_INET6) {
if (setsockopt(handle->io_watcher.fd,
IPPROTO_IPV6,
IPV6_MULTICAST_IF,
&addr6->sin6_scope_id,
sizeof(addr6->sin6_scope_id)) == -1) {
return -errno;
}
} else {
assert(0 && "unexpected address family");
abort();
}
return 0;
}
int uv_udp_getsockname(const uv_udp_t* handle,
struct sockaddr* name,
int* namelen) {
socklen_t socklen;
if (handle->io_watcher.fd == -1)
return -EINVAL; /* FIXME(bnoordhuis) -EBADF */
/* sizeof(socklen_t) != sizeof(int) on some systems. */
socklen = (socklen_t) *namelen;
if (getsockname(handle->io_watcher.fd, name, &socklen))
return -errno;
*namelen = (int) socklen;
return 0;
}
int uv__udp_recv_start(uv_udp_t* handle,
uv_alloc_cb alloc_cb,
uv_udp_recv_cb recv_cb) {
int err;
if (alloc_cb == NULL || recv_cb == NULL)
return -EINVAL;
if (uv__io_active(&handle->io_watcher, UV__POLLIN))
return -EALREADY; /* FIXME(bnoordhuis) Should be -EBUSY. */
err = uv__udp_maybe_deferred_bind(handle, AF_INET, 0);
if (err)
return err;
handle->alloc_cb = alloc_cb;
handle->recv_cb = recv_cb;
uv__io_start(handle->loop, &handle->io_watcher, UV__POLLIN);
uv__handle_start(handle);
return 0;
}
int uv__udp_recv_stop(uv_udp_t* handle) {
uv__io_stop(handle->loop, &handle->io_watcher, UV__POLLIN);
if (!uv__io_active(&handle->io_watcher, UV__POLLOUT))
uv__handle_stop(handle);
handle->alloc_cb = NULL;
handle->recv_cb = NULL;
return 0;
}
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