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/* Copyright (c) 2008,2009 Ryan Dahl
*
* evcom_queue comes from ngx_queue.h
* Copyright (C) 2002-2009 Igor Sysoev
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h> /* memset */
#include <signal.h>
#include <netinet/tcp.h> /* TCP_NODELAY */
#include <sys/types.h>
#include <sys/socket.h> /* shutdown */
#include <sys/un.h>
#include <netinet/in.h> /* sockaddr_in, sockaddr_in6 */
#include <ev.h>
#include <evcom.h>
#if EV_MULTIPLICITY
# define D_LOOP_(d) (d)->loop,
# define D_LOOP_SET(d, _loop) do { (d)->loop = (_loop); } while (0)
#else
# define D_LOOP_(d)
# define D_LOOP_SET(d, _loop)
#endif // EV_MULTIPLICITY
/* SEND STATES */
static int stream_send__wait_for_connection (evcom_stream*);
static int stream_send__data (evcom_stream*);
static int stream_send__drain (evcom_stream*);
static int stream_send__wait_for_eof (evcom_stream*);
static int stream_send__wait_for_buf (evcom_stream*);
static int stream_send__shutdown (evcom_stream*);
#if EVCOM_HAVE_GNUTLS
static int stream_send__gnutls_bye (evcom_stream*);
#endif
static int stream_send__close_one (evcom_stream*);
static int stream_send__close (evcom_stream*);
/* RECV STATES */
static int stream_recv__data (evcom_stream*);
static int stream_recv__wait_for_resume (evcom_stream*);
static int stream_recv__wait_for_close (evcom_stream*);
static int stream_recv__close_one (evcom_stream*);
static int stream_recv__close (evcom_stream*);
/* COMMON STATES */
#if EVCOM_HAVE_GNUTLS
static int stream__handshake (evcom_stream*);
#endif
static int stream__close_both (evcom_stream*);
#undef TRUE
#define TRUE 1
#undef FALSE
#define FALSE 0
#undef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define OKAY 0
#define AGAIN 1
#define ATTACHED(s) ((s)->flags & EVCOM_ATTACHED)
#define LISTENING(s) ((s)->flags & EVCOM_LISTENING)
#define CONNECTED(s) ((s)->flags & EVCOM_CONNECTED)
#define SECURE(s) ((s)->flags & EVCOM_SECURE)
#define DUPLEX(s) ((s)->flags & EVCOM_DUPLEX)
#define GOT_CLOSE(s) ((s)->flags & EVCOM_GOT_CLOSE)
#define PAUSED(s) ((s)->flags & EVCOM_PAUSED)
#define READABLE(s) ((s)->flags & EVCOM_READABLE)
#define WRITABLE(s) ((s)->flags & EVCOM_WRITABLE)
static int too_many_connections = 0;
EV_INLINE int
set_nonblock (int fd)
{
int flags = fcntl(fd, F_GETFL, 0);
if (flags == -1) return -1;
int r = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
if (r == -1) return -1;
return 0;
}
evcom_buf *
evcom_buf_new2 (size_t len)
{
void *data = malloc(sizeof(evcom_buf) + len);
if (!data) return NULL;
evcom_buf *buf = data;
buf->len = len;
buf->release = (void (*)(evcom_buf*))free;
buf->base = data + sizeof(evcom_buf);
return buf;
}
evcom_buf *
evcom_buf_new (const char *base, size_t len)
{
evcom_buf* buf = evcom_buf_new2(len);
if (!buf) return NULL;
memcpy(buf->base, base, len);
return buf;
}
void evcom_ignore_sigpipe (void)
{
struct sigaction sa;
bzero(&sa, sizeof(sa));
sa.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &sa, NULL);
}
static int
close_asap (evcom_descriptor *d)
{
if (d->fd < 0) return OKAY;
int r = close(d->fd);
if (r < 0) {
if (errno == EINTR) {
d->action = close_asap;
return AGAIN;
} else {
d->errorno = errno;
}
}
d->action = NULL;
d->fd = -1;
return OKAY;
}
#define release_write_buffer(writer) \
do { \
while (!evcom_queue_empty(&(writer)->out)) { \
evcom_queue *q = evcom_queue_last(&(writer)->out); \
evcom_buf *buf = evcom_queue_data(q, evcom_buf, queue); \
evcom_queue_remove(q); \
if (buf->release) buf->release(buf); \
} \
} while (0)
static int
close_writer_asap (evcom_writer *writer)
{
release_write_buffer(writer);
ev_feed_event(D_LOOP_(writer) &writer->write_watcher, EV_WRITE);
return close_asap((evcom_descriptor*)writer);
}
static inline void
evcom_perror (const char *msg, int errorno)
{
fprintf(stderr, "(evcom) %s %s\n", msg, strerror(errorno));
}
static int
stream_send__wait_for_buf (evcom_stream *stream)
{
if (evcom_queue_empty(&stream->out)) {
if (GOT_CLOSE(stream)) {
stream->send_action = stream_send__drain;
return OKAY;
}
ev_io_stop(D_LOOP_(stream) &stream->write_watcher);
return AGAIN;
}
stream->send_action = stream_send__data;
return OKAY;
}
static inline void
stream__set_recv_closed (evcom_stream *stream)
{
stream->flags &= ~EVCOM_READABLE;
stream->recvfd = -1;
stream->recv_action = NULL;
ev_io_stop(D_LOOP_(stream) &stream->read_watcher);
}
static inline void
stream__set_send_closed (evcom_stream *stream)
{
release_write_buffer(stream);
stream->flags &= ~EVCOM_WRITABLE;
stream->sendfd = -1;
stream->send_action = NULL;
ev_io_stop(D_LOOP_(stream) &stream->write_watcher);
}
static int
stream_send__close_one (evcom_stream *stream)
{
assert(stream->sendfd >= 0);
close(stream->sendfd);
/* TODO recover from EINTR */
stream__set_send_closed(stream);
if (DUPLEX(stream) || stream->recv_action == stream_recv__wait_for_close) {
stream__set_recv_closed(stream);
}
return OKAY;
}
static int
stream__close_both (evcom_stream *stream)
{
assert(stream->sendfd != stream->recvfd);
assert(stream->sendfd >= 0);
assert(stream->recvfd >= 0);
close(stream->recvfd);
close(stream->sendfd);
/* TODO recover from EINTR */
stream__set_send_closed(stream);
stream__set_recv_closed(stream);
return OKAY;
}
static int
stream_send__close (evcom_stream *stream)
{
if (DUPLEX(stream) || stream->recvfd < 0) {
stream->send_action = stream_send__close_one;
} else {
stream->send_action = stream__close_both;
}
return OKAY;
}
static int
stream_recv__close_one (evcom_stream *stream)
{
assert(stream->recvfd >= 0);
close(stream->recvfd);
/* TODO recover from EINTR */
stream__set_recv_closed(stream);
if (DUPLEX(stream)) {
stream__set_send_closed(stream);
}
return OKAY;
}
static int
stream_recv__close (evcom_stream *stream)
{
if (DUPLEX(stream) || stream->sendfd < 0) {
stream->recv_action = stream_recv__close_one;
} else {
stream->recv_action = stream__close_both;
}
return OKAY;
}
static int
stream_send__drain (evcom_stream *stream)
{
if (!GOT_CLOSE(stream)) {
stream->send_action = stream_send__wait_for_buf;
return OKAY;
}
#if EVCOM_HAVE_GNUTLS
if (SECURE(stream)) {
stream->send_action = stream_send__gnutls_bye;
return OKAY;
}
#endif
if (DUPLEX(stream)) {
stream->send_action = stream_send__shutdown;
return OKAY;
}
stream->send_action = stream_send__close_one;
return OKAY;
}
static int
stream_send__wait_for_eof (evcom_stream *stream)
{
if (READABLE(stream)) {
ev_io_stop(D_LOOP_(stream) &stream->write_watcher);
assert(stream->send_action == stream_send__wait_for_eof);
return AGAIN;
}
stream->send_action = stream_send__close_one;
return OKAY;
}
static inline ssize_t
nosigpipe_send (int fd, const void *buf, size_t len)
{
int flags = 0;
#ifdef MSG_NOSIGNAL
flags |= MSG_NOSIGNAL;
#endif
#ifdef MSG_DONTWAIT
flags |= MSG_DONTWAIT;
#endif
return send(fd, buf, len, flags);
}
static inline ssize_t
nosigpipe_stream_send (evcom_stream *stream, const void *buf, size_t len)
{
return write(stream->sendfd, buf, len);
}
#if EVCOM_HAVE_GNUTLS
static ssize_t
nosigpipe_push (gnutls_transport_ptr_t data, const void *buf, size_t len)
{
evcom_stream *stream = (evcom_stream*)data;
assert(SECURE(stream));
return nosigpipe_stream_send(stream, buf, len);
}
static ssize_t
pull (gnutls_transport_ptr_t data, void* buf, size_t len)
{
evcom_stream *stream = (evcom_stream*)data;
assert(SECURE(stream));
return read(stream->recvfd, buf, len);
}
static int
stream__handshake (evcom_stream *stream)
{
assert(SECURE(stream));
int r = gnutls_handshake(stream->session);
if (gnutls_error_is_fatal(r)) {
stream->gnutls_errorno = r;
stream->send_action = stream_send__close;
stream->recv_action = stream_recv__close;
return OKAY;
}
ev_timer_again(D_LOOP_(stream) &stream->timeout_watcher);
if (r == GNUTLS_E_INTERRUPTED || r == GNUTLS_E_AGAIN) {
if (0 == gnutls_record_get_direction((stream)->session)) {
ev_io_start(D_LOOP_(stream) &(stream)->read_watcher);
ev_io_stop(D_LOOP_(stream) &(stream)->write_watcher);
} else {
ev_io_stop(D_LOOP_(stream) &(stream)->read_watcher);
ev_io_start(D_LOOP_(stream) &(stream)->write_watcher);
}
assert(stream->recv_action == stream__handshake);
assert(stream->send_action == stream__handshake);
return AGAIN;
}
assert(!CONNECTED(stream));
stream->flags |= EVCOM_CONNECTED;
if (stream->on_connect) stream->on_connect(stream);
/* evcom_stream_force_close might have been called. */
if (stream->recvfd >= 0 && stream->sendfd >= 0) {
ev_io_start(D_LOOP_(stream) &stream->read_watcher);
ev_io_start(D_LOOP_(stream) &stream->write_watcher);
stream->send_action = stream_send__data;
stream->recv_action = stream_recv__data;
}
return OKAY;
}
static int
stream_send__gnutls_bye (evcom_stream *stream)
{
assert(SECURE(stream));
int r = gnutls_bye(stream->session, GNUTLS_SHUT_WR);
if (r == GNUTLS_E_INTERRUPTED || r == GNUTLS_E_AGAIN) {
assert(1 == gnutls_record_get_direction((stream)->session));
assert(stream->send_action == stream_send__gnutls_bye);
return AGAIN;
}
if (gnutls_error_is_fatal(r)) {
stream->gnutls_errorno = r;
stream->send_action = stream_send__close;
return OKAY;
}
stream->flags &= ~EVCOM_WRITABLE;
stream->send_action = stream_send__wait_for_eof;
return OKAY;
}
void
evcom_stream_set_secure_session (evcom_stream *stream, gnutls_session_t session)
{
stream->session = session;
stream->flags |= EVCOM_SECURE;
}
#endif /* HAVE GNUTLS */
static int
stream_recv__wait_for_close (evcom_stream *stream)
{
assert(!READABLE(stream));
if (!WRITABLE(stream)) {
stream->recv_action = stream_recv__close;
return OKAY;
}
ev_io_stop(D_LOOP_(stream) &stream->read_watcher);
return AGAIN;
}
static int
stream_recv__wait_for_resume (evcom_stream *stream)
{
stream->flags |= EVCOM_PAUSED;
ev_io_stop(D_LOOP_(stream) &stream->read_watcher);
assert(stream->recv_action == stream_recv__wait_for_resume);
return AGAIN;
}
static int
stream_recv__data (evcom_stream *stream)
{
char buf[EVCOM_CHUNKSIZE];
size_t buf_size = EVCOM_CHUNKSIZE;
ssize_t recved;
while (READABLE(stream)) {
assert(CONNECTED(stream));
if (PAUSED(stream)) {
stream->recv_action = stream_recv__wait_for_resume;
return OKAY;
}
#if EVCOM_HAVE_GNUTLS
if (SECURE(stream)) {
recved = gnutls_record_recv(stream->session, buf, buf_size);
if (gnutls_error_is_fatal(recved)) {
stream->gnutls_errorno = recved;
stream->recv_action = stream_recv__close;
return OKAY;
}
if (recved == GNUTLS_E_INTERRUPTED || recved == GNUTLS_E_AGAIN) {
if (1 == gnutls_record_get_direction((stream)->session)) {
fprintf(stderr, "(evcom) gnutls recv: unexpected switch direction!\n");
ev_io_stop(D_LOOP_(stream) &(stream)->read_watcher);
ev_io_start(D_LOOP_(stream) &(stream)->write_watcher);
}
return AGAIN;
}
/* A server may also receive GNUTLS_E_REHANDSHAKE when a client has
* initiated a andshake. In that case the server can only initiate a
* handshake or terminate the connection. */
if (recved == GNUTLS_E_REHANDSHAKE) {
assert(WRITABLE(stream));
stream->recv_action = stream__handshake;
stream->send_action = stream__handshake;
return OKAY;
}
} else
#endif /* EVCOM_HAVE_GNUTLS */
{
recved = read(stream->recvfd, buf, buf_size);
}
if (recved < 0) {
if (errno == EAGAIN || errno == EINTR) {
assert(stream->recv_action == stream_recv__data);
return AGAIN;
}
if (errno != ECONNRESET) {
evcom_perror("recv()", stream->errorno);
}
stream->errorno = errno;
stream->recv_action = stream_recv__close;
return OKAY;
}
ev_timer_again(D_LOOP_(stream) &stream->timeout_watcher);
assert(recved >= 0);
if (recved == 0) {
stream->flags &= ~EVCOM_READABLE;
ev_io_stop(D_LOOP_(stream) &stream->read_watcher);
stream->recv_action = stream_recv__wait_for_close;
}
/* NOTE: EOF is signaled with recved == 0 on callback */
if (stream->on_read) stream->on_read(stream, buf, recved);
if (recved == 0) {
return OKAY;
}
}
return AGAIN;
}
static int
stream_send__data (evcom_stream *stream)
{
ssize_t sent;
while (!evcom_queue_empty(&stream->out)) {
assert(WRITABLE(stream));
evcom_queue *q = evcom_queue_last(&stream->out);
evcom_buf *buf = evcom_queue_data(q, evcom_buf, queue);
#if EVCOM_HAVE_GNUTLS
if (SECURE(stream)) {
sent = gnutls_record_send(stream->session,
buf->base + buf->written,
buf->len - buf->written);
if (sent == GNUTLS_E_INTERRUPTED || sent == GNUTLS_E_AGAIN) {
if (0 == gnutls_record_get_direction((stream)->session)) {
fprintf(stderr, "(evcom) gnutls send: unexpected switch direction!\n");
ev_io_start(D_LOOP_(stream) &(stream)->read_watcher);
ev_io_stop(D_LOOP_(stream) &(stream)->write_watcher);
}
return AGAIN;
}
if (gnutls_error_is_fatal(sent)) {
stream->gnutls_errorno = sent;
stream->send_action = stream_send__close;
return OKAY;
}
} else
#endif // EVCOM_HAVE_GNUTLS
{
/* TODO use writev() here? */
sent = nosigpipe_stream_send(stream,
buf->base + buf->written,
buf->len - buf->written);
}
if (sent <= 0) {
if (errno == EAGAIN || errno == EINTR) {
assert(stream->send_action == stream_send__data);
return AGAIN;
}
stream->errorno = errno;
evcom_perror("send()", errno);
stream->send_action = stream_send__close;
return OKAY;
}
ev_timer_again(D_LOOP_(stream) &stream->timeout_watcher);
assert(sent >= 0);
buf->written += sent;
if (buf->written == buf->len) {
evcom_queue_remove(q);
if (buf->release) buf->release(buf);
}
}
assert(evcom_queue_empty(&stream->out));
stream->send_action = stream_send__drain;
return OKAY;
}
static int
stream_send__shutdown (evcom_stream *stream)
{
int r = shutdown(stream->sendfd, SHUT_WR);
if (r < 0) {
switch (errno) {
case EINTR:
assert(stream->send_action == stream_send__shutdown);
return OKAY;
case ENOTCONN:
break;
default:
stream->errorno = errno;
evcom_perror("shutdown()", errno);
break;
}
stream->send_action = stream_send__close;
return OKAY;
}
stream->flags &= ~EVCOM_WRITABLE;
stream->send_action = stream_send__wait_for_eof;
return OKAY;
}
static int
stream__connection_established (evcom_stream *stream)
{
assert(!CONNECTED(stream));
#if EVCOM_HAVE_GNUTLS
if (SECURE(stream)) {
stream->send_action = stream__handshake;
stream->recv_action = stream__handshake;
} else
#endif
{
stream->flags |= EVCOM_CONNECTED;
if (stream->on_connect) stream->on_connect(stream);
stream->send_action = stream_send__data;
stream->recv_action = stream_recv__data;
}
ev_io_start(D_LOOP_(stream) &stream->write_watcher);
ev_io_start(D_LOOP_(stream) &stream->read_watcher);
return OKAY;
}
static int
stream_send__wait_for_connection (evcom_stream *stream)
{
assert(DUPLEX(stream));
int connect_error;
socklen_t len = sizeof(int);
int r = getsockopt(stream->sendfd, SOL_SOCKET, SO_ERROR, &connect_error, &len);
if (r < 0) {
stream->errorno = r;
stream->send_action = stream_send__close;
return OKAY;
}
if (connect_error == 0) {
stream->send_action = stream__connection_established;
return OKAY;
} else if (connect_error == EINPROGRESS || connect_error == EINTR) {
assert(stream->send_action == stream_send__wait_for_connection);
return AGAIN;
}
stream->errorno = connect_error;
stream->send_action = stream_send__close;
return OKAY;
}
void
evcom_stream_assign_fds (evcom_stream *stream, int recvfd, int sendfd)
{
assert(recvfd >= 0);
assert(sendfd >= 0);
if (recvfd == sendfd) stream->flags |= EVCOM_DUPLEX;
if (set_nonblock(recvfd) != 0) {
evcom_perror("set_nonblock(recvfd)", errno);
}
if (set_nonblock(sendfd) != 0) {
evcom_perror("set_nonblock(sendfd)", errno);
}
#ifdef SO_NOSIGPIPE
if (DUPLEX(stream)) {
int flags = 1;
int r = setsockopt(sendfd, SOL_SOCKET, SO_NOSIGPIPE, &flags, sizeof(flags));
if (r < 0) {
evcom_perror("setsockopt(SO_NOSIGPIPE)", errno);
}
}
#endif
ev_io_set(&stream->read_watcher, recvfd, EV_READ);
ev_io_set(&stream->write_watcher, sendfd, EV_WRITE);
stream->recvfd = recvfd;
stream->sendfd = sendfd;
stream->send_action = stream__connection_established;
stream->recv_action = stream__connection_established;
stream->flags |= EVCOM_READABLE;
stream->flags |= EVCOM_WRITABLE;
#if EVCOM_HAVE_GNUTLS
if (SECURE(stream)) {
gnutls_transport_set_lowat(stream->session, 0);
gnutls_transport_set_push_function(stream->session, nosigpipe_push);
gnutls_transport_set_pull_function(stream->session, pull);
gnutls_transport_set_ptr2(stream->session, stream, stream);
}
#endif
}
/* Retruns evcom_stream if a connection could be accepted.
* The returned stream is not yet attached to the event loop.
* Otherwise NULL
*/
static evcom_stream*
accept_connection (evcom_server *server)
{
struct sockaddr address; /* connector's address information */
socklen_t addr_len = sizeof(address);
int fd = accept(server->fd, &address, &addr_len);
if (fd < 0) {
switch (errno) {
case EMFILE:
case ENFILE:
too_many_connections = 1;
server->flags |= EVCOM_TOO_MANY_CONN;
evcom_server_detach(server);
return NULL;
case EINTR:
case EAGAIN:
return NULL;
default:
evcom_perror("accept()", errno);
return NULL;
}
assert(0 && "no reach");
}
evcom_stream *stream = NULL;
if (server->on_connection) {
stream = server->on_connection(server, &address);
}
if (stream == NULL) {
close(fd);
return NULL;
}
if (set_nonblock(fd) != 0) {
evcom_perror("set_nonblock()", errno);
return NULL;
}
stream->server = server;
evcom_stream_assign_fds(stream, fd, fd);
return stream;
}
/* Internal callback
* Called by server->watcher.
*/
static int
accept_connections (evcom_descriptor *d)
{
evcom_server *server = (evcom_server *)d;
assert(LISTENING(server));
/* accept as many connections as possible */
evcom_stream *stream;
while (server->fd >= 0 && (stream = accept_connection(server))) {
evcom_stream_attach(D_LOOP_(server) stream);
}
return AGAIN;
}
static inline socklen_t
address_length (struct sockaddr *address)
{
struct sockaddr_un* unix_address = (struct sockaddr_un*)address;
switch (address->sa_family) {
case AF_INET:
return sizeof(struct sockaddr_in);
case AF_INET6:
return sizeof(struct sockaddr_in6);
case AF_UNIX:
return strlen(unix_address->sun_path) + sizeof(unix_address->sun_family);
default:
assert(0 && "Unsupported socket family");
}
return 0;
}
int
evcom_server_listen (evcom_server *server, struct sockaddr *address, int backlog)
{
assert(!LISTENING(server));
int fd = socket(address->sa_family, SOCK_STREAM, 0);
if (fd < 0) {
server->errorno = errno;
evcom_perror("socket()", errno);
return -1;
}
server->fd = fd;
ev_io_set(&server->watcher, server->fd, EV_READ);
if (set_nonblock(fd) != 0) {
server->errorno = errno;
evcom_perror("set_nonblock()", errno);
close(fd);
return -1;
}
int flags = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&flags, sizeof(flags));
setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&flags, sizeof(flags));
/* XXX: Sending single byte chunks in a response body? Perhaps there is a
* need to enable the Nagel algorithm dynamically. For now disabling.
*/
//setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (void *)&flags, sizeof(flags));
if (bind(fd, address, address_length(address)) < 0) {
server->errorno = errno;
evcom_perror("bind()", errno);
close(fd);
return -1;
}
if (listen(fd, backlog) < 0) {
server->errorno = errno;
evcom_perror("listen()", errno);
close(fd);
return -1;
}
server->flags |= EVCOM_LISTENING;
server->action = accept_connections;
return 0;
}
/**
* Stops the server. Will not accept new connections. Does not drop
* existing connections.
*/
void
evcom_server_close (evcom_server *server)
{
ev_io_start(D_LOOP_(server) &server->watcher);
ev_feed_event(D_LOOP_(server) &server->watcher, EV_READ);
close_asap((evcom_descriptor*)server);
}
void
evcom_server_attach (EV_P_ evcom_server *server)
{
ev_io_start (EV_A_ &server->watcher);
D_LOOP_SET(server, EV_A);
server->flags |= EVCOM_ATTACHED;
}
void
evcom_server_detach (evcom_server *server)
{
ev_io_stop (D_LOOP_(server) &server->watcher);
D_LOOP_SET(server, NULL);
server->flags &= ~EVCOM_ATTACHED;
}
static void
io_event(EV_P_ ev_io *watcher, int revents)
{
evcom_descriptor *d = watcher->data;
#if EV_MULTIPLICITY
assert(d->loop == loop);
#endif
int r = OKAY;
if (revents & EV_ERROR) {
d->errorno = 1;
r = close_asap(d);
}
while (r == OKAY && d->action && d->fd >= 0) {
r = d->action(d);
}
if (d->fd < 0) {
assert(d->action == NULL);
ev_clear_pending(EV_A_ watcher);
ev_io_stop(EV_A_ watcher);
if (d->on_close) d->on_close(d);
}
}
static void
evcom_descriptor_init (evcom_descriptor *d)
{
d->fd = -1;
D_LOOP_SET(d, NULL);
d->flags = 0;
d->errorno = 0;
d->action = NULL;
}
void
evcom_server_init (evcom_server *server)
{
evcom_descriptor_init((evcom_descriptor*)server);
ev_init (&server->watcher, io_event);
server->watcher.data = server;
server->on_connection = NULL;
}
/* Internal callback. called by stream->timeout_watcher */
static void
on_timeout (EV_P_ ev_timer *watcher, int revents)
{
evcom_stream *stream = watcher->data;
#if EV_MULTIPLICITY
assert(stream->loop == loop);
#endif
assert(revents == EV_TIMEOUT);
assert(watcher == &stream->timeout_watcher);
if (PAUSED(stream)) {
ev_timer_again(D_LOOP_(stream) &stream->timeout_watcher);
return;
}
if (stream->on_timeout) stream->on_timeout(stream);
evcom_stream_force_close(stream);
if (stream->on_close) stream->on_close(stream);
}
static void
stream_event (EV_P_ ev_io *w, int revents)
{
evcom_stream *stream = w->data;
if (revents & EV_READ) {
while (stream->recv_action) {
int r = stream->recv_action(stream);
if (r == AGAIN) break;
}
}
if (revents & EV_WRITE) {
while (stream->send_action) {
int r = stream->send_action(stream);
if (r == AGAIN) break;
}
}
if (stream->send_action == NULL) {
ev_io_stop(EV_A_ &stream->write_watcher);
}
if (stream->recv_action == NULL) {
ev_io_stop(EV_A_ &stream->read_watcher);
}
if (stream->sendfd < 0 && stream->recvfd < 0) {
ev_timer_stop(EV_A_ &stream->timeout_watcher);
if (stream->server && (stream->server->flags & EVCOM_TOO_MANY_CONN)) {
#if EV_MULTIPLICITY
struct ev_loop *loop = stream->server->loop;
#endif
stream->server->flags &= ~EVCOM_TOO_MANY_CONN;
evcom_server_attach(EV_A_ stream->server);
}
too_many_connections = 0;
if (stream->on_close) stream->on_close(stream);
}
}
/**
* If using SSL do consider setting
* gnutls_db_set_retrieve_function (stream->session, _);
* gnutls_db_set_remove_function (stream->session, _);
* gnutls_db_set_store_function (stream->session, _);
* gnutls_db_set_ptr (stream->session, _);
*/
void
evcom_stream_init (evcom_stream *stream)
{
stream->flags = 0;
stream->errorno = 0;
stream->recvfd = -1;
stream->sendfd = -1;
// reader things
ev_init(&stream->read_watcher, stream_event);
stream->read_watcher.data = stream;
stream->recv_action = NULL;
// writer things
ev_init(&stream->write_watcher, stream_event);
stream->write_watcher.data = stream;
evcom_queue_init(&stream->out);
stream->send_action = NULL;
// stream things
stream->server = NULL;
#if EVCOM_HAVE_GNUTLS
stream->gnutls_errorno = 0;
stream->session = NULL;
#endif
ev_timer_init(&stream->timeout_watcher, on_timeout, 0., 60.);
stream->timeout_watcher.data = stream;
stream->on_connect = NULL;
stream->on_timeout = NULL;
stream->on_read = NULL;
stream->on_close = NULL;
}
void
evcom_stream_close (evcom_stream *stream)
{
stream->flags |= EVCOM_GOT_CLOSE;
if (ATTACHED(stream)) {
// start the watchers if attached.
evcom_stream_attach(D_LOOP_(stream) stream);
}
}
void evcom_stream_force_close (evcom_stream *stream)
{
if (stream->recvfd >= 0) {
close(stream->recvfd);
/* XXX What to do on EINTR? */
stream__set_recv_closed(stream);
}
if (!DUPLEX(stream) && stream->sendfd >= 0) {
close(stream->sendfd);
}
stream__set_send_closed(stream);
evcom_stream_detach(stream);
}
void
evcom_stream_write (evcom_stream *stream, const char *str, size_t len)
{
if (!WRITABLE(stream) || GOT_CLOSE(stream)) {
assert(0 && "Do not write to a closed stream");
return;
}
ssize_t sent = 0;
if ( stream->send_action == stream_send__wait_for_buf
&& evcom_queue_empty(&stream->out)
)
{
assert(CONNECTED(stream));
#if EVCOM_HAVE_GNUTLS
if (SECURE(stream)) {
sent = gnutls_record_send(stream->session, str, len);
if (gnutls_error_is_fatal(sent)) {
stream->gnutls_errorno = sent;
goto close;
}
} else
#endif // EVCOM_HAVE_GNUTLS
{
/* TODO use writev() here? */
sent = nosigpipe_stream_send(stream, str, len);
}
if (sent < 0) {
switch (errno) {
case EINTR:
case EAGAIN:
sent = 0;
break;
default:
stream->errorno = errno;
evcom_perror("send()", stream->errorno);
goto close;
}
}
} /* TODO else { memcpy to last buffer on head } */
assert(sent >= 0);
if ((size_t)sent == len) return; /* sent the whole buffer */
len -= sent;
str += sent;
evcom_buf *b = evcom_buf_new(str, len);
evcom_queue_insert_head(&stream->out, &b->queue);
b->written = 0;
assert(stream->sendfd >= 0);
if (ATTACHED(stream)) {
ev_io_start(D_LOOP_(stream) &stream->write_watcher);
}
return;
close:
stream->send_action = stream_send__close;
stream->recv_action = stream_recv__close;
if (ATTACHED(stream)) {
ev_io_start(D_LOOP_(stream) &stream->write_watcher);
}
}
void
evcom_stream_reset_timeout (evcom_stream *stream, float timeout)
{
stream->timeout_watcher.repeat = timeout;
if (ATTACHED(stream)) {
ev_timer_again(D_LOOP_(stream) &stream->timeout_watcher);
}
}
void
evcom_stream_attach (EV_P_ evcom_stream *stream)
{
D_LOOP_SET(stream, EV_A);
stream->flags |= EVCOM_ATTACHED;
ev_timer_again(EV_A_ &stream->timeout_watcher);
if (READABLE(stream)) {
ev_io_start(EV_A_ &stream->read_watcher);
}
if (WRITABLE(stream)) {
ev_io_start(EV_A_ &stream->write_watcher);
}
}
void
evcom_stream_detach (evcom_stream *stream)
{
ev_io_stop(D_LOOP_(stream) &stream->write_watcher);
ev_io_stop(D_LOOP_(stream) &stream->read_watcher);
ev_timer_stop(D_LOOP_(stream) &stream->timeout_watcher);
D_LOOP_SET(stream, NULL);
stream->flags &= ~EVCOM_ATTACHED;
}
void
evcom_stream_read_pause (evcom_stream *stream)
{
stream->flags |= EVCOM_PAUSED;
ev_timer_stop(D_LOOP_(stream) &stream->timeout_watcher);
if (stream->recv_action == stream_recv__data) {
ev_io_stop(D_LOOP_(stream) &stream->read_watcher);
stream->recv_action = stream_recv__wait_for_resume;
}
}
void
evcom_stream_read_resume (evcom_stream *stream)
{
stream->flags &= ~EVCOM_PAUSED;
ev_timer_again(D_LOOP_(stream) &stream->timeout_watcher);
if (stream->recv_action == stream_recv__wait_for_resume) {
stream->recv_action = stream_recv__data;
}
if (ATTACHED(stream)) {
ev_timer_again(D_LOOP_(stream) &stream->timeout_watcher);
if (READABLE(stream)) ev_io_start(D_LOOP_(stream) &stream->read_watcher);
}
}
int
evcom_stream_connect (evcom_stream *stream, struct sockaddr *address)
{
int fd = socket(address->sa_family, SOCK_STREAM, 0);
if (fd < 0) {
evcom_perror("socket()", errno);
return -1;
}
int r = set_nonblock(fd);
if (r < 0) {
stream->errorno = errno;
evcom_perror("set_nonblock()", errno);
close(fd);
return -1;
}
r = connect(fd, address, address_length(address));
if (r < 0 && errno != EINPROGRESS) {
stream->errorno = errno;
evcom_perror("connect", errno);
close(fd);
return -1;
}
evcom_stream_assign_fds(stream, fd, fd);
stream->send_action = stream_send__wait_for_connection;
stream->recv_action = NULL;
return 0;
}
int evcom_stream_pair (evcom_stream *a, evcom_stream *b)
{
int sv[2];
int old_errno;
int r = socketpair(PF_LOCAL, SOCK_STREAM, 0, sv);
if (r < 0) return -1;
r = set_nonblock(sv[0]);
if (r < 0) goto set_nonblock_error;
r = set_nonblock(sv[1]);
if (r < 0) goto set_nonblock_error;
evcom_stream_assign_fds(a, sv[0], sv[0]);
evcom_stream_assign_fds(b, sv[1], sv[1]);
return 0;
set_nonblock_error:
old_errno = errno;
evcom_perror("set_nonblock()", errno);
close(sv[0]);
close(sv[1]);
errno = old_errno;
return -1;
}
enum evcom_stream_state
evcom_stream_state (evcom_stream *stream)
{
if (stream->recvfd < 0 && stream->sendfd && stream->flags == 0) {
return EVCOM_INITIALIZED;
}
if (stream->recvfd < 0 && stream->sendfd < 0) return EVCOM_CLOSED;
if (!CONNECTED(stream)) return EVCOM_CONNECTING;
if (GOT_CLOSE(stream)) {
if (READABLE(stream)) {
return EVCOM_CONNECTED_RO;
} else {
return EVCOM_CLOSING;
}
}
if (READABLE(stream) && WRITABLE(stream)) return EVCOM_CONNECTED_RW;
if (WRITABLE(stream)) return EVCOM_CONNECTED_WO;
if (READABLE(stream)) return EVCOM_CONNECTED_RO;
return EVCOM_CLOSING;
}
static int
reader_recv (evcom_descriptor *d)
{
evcom_reader* reader = (evcom_reader*) d;
char buf[EVCOM_CHUNKSIZE];
size_t buf_size = EVCOM_CHUNKSIZE;
ssize_t recved;
while (reader->fd >= 0) {
recved = read(reader->fd, buf, buf_size);
if (recved < 0) {
if (errno == EAGAIN || errno == EINTR) return AGAIN;
reader->errorno = errno;
evcom_perror("read()", reader->errorno);
return close_asap(d);
}
/* NOTE: EOF is signaled with recved == 0 on callback */
if (reader->on_read) reader->on_read(reader, buf, recved);
if (recved == 0) return close_asap(d);
}
return AGAIN;
}
void
evcom_reader_init (evcom_reader *reader)
{
evcom_descriptor_init((evcom_descriptor*)reader);
reader->on_close = NULL;
reader->on_read = NULL;
ev_init(&reader->read_watcher, io_event);
reader->read_watcher.data = reader;
}
void
evcom_reader_set (evcom_reader *reader, int fd)
{
assert(fd >= 0);
reader->fd = fd;
ev_io_set(&reader->read_watcher, fd, EV_READ);
reader->action = reader_recv;
}
void
evcom_reader_attach (EV_P_ evcom_reader *reader)
{
ev_io_start(EV_A_ &reader->read_watcher);
D_LOOP_SET(reader, EV_A);
}
void
evcom_reader_detach (evcom_reader *reader)
{
ev_io_stop(D_LOOP_(reader) &reader->read_watcher);
D_LOOP_SET(reader, NULL);
}
void
evcom_reader_close (evcom_reader *reader)
{
ev_io_start(D_LOOP_(reader) &reader->read_watcher);
ev_feed_event(D_LOOP_(reader) &reader->read_watcher, EV_READ);
close_asap((evcom_descriptor*)reader);
}
static int
writer_send (evcom_descriptor *d)
{
evcom_writer* writer = (evcom_writer*) d;
assert(writer->fd >= 0);
while (!evcom_queue_empty(&writer->out)) {
evcom_queue *q = evcom_queue_last(&writer->out);
evcom_buf *buf = evcom_queue_data(q, evcom_buf, queue);
ssize_t sent = write(writer->fd, buf->base + buf->written,
buf->len - buf->written);
if (sent < 0) {
switch (errno) {
case ECONNRESET:
case EPIPE:
return close_writer_asap(writer);
case EINTR:
case EAGAIN:
sent = 0;
return AGAIN;
default:
writer->errorno = errno;
evcom_perror("send()", writer->errorno);
return close_writer_asap(writer);
}
}
assert(sent >= 0);
buf->written += sent;
if (buf->written == buf->len) {
evcom_queue_remove(q);
if (buf->release) buf->release(buf);
}
}
if (GOT_CLOSE(writer)) {
assert(evcom_queue_empty(&writer->out));
return close_writer_asap(writer);
} else {
ev_io_stop(D_LOOP_(writer) &writer->write_watcher);
return AGAIN;
}
}
void
evcom_writer_init (evcom_writer* writer)
{
evcom_descriptor_init((evcom_descriptor*)writer);
writer->on_close = NULL;
ev_init(&writer->write_watcher, io_event);
writer->write_watcher.data = writer;
evcom_queue_init(&writer->out);
}
void
evcom_writer_set (evcom_writer* writer, int fd)
{
assert(fd >= 0);
writer->fd = fd;
ev_io_set(&writer->write_watcher, fd, EV_WRITE);
writer->action = writer_send;
}
void
evcom_writer_attach (EV_P_ evcom_writer* writer)
{
if (!evcom_queue_empty(&writer->out)) {
ev_io_start (EV_A_ &writer->write_watcher);
}
D_LOOP_SET(writer, EV_A);
}
void
evcom_writer_detach (evcom_writer* writer)
{
ev_io_stop(D_LOOP_(writer) &writer->write_watcher);
D_LOOP_SET(writer, NULL);
}
void
evcom_writer_write (evcom_writer* writer, const char* buf, size_t len)
{
assert(writer->fd >= 0);
ssize_t sent = 0;
if (evcom_queue_empty(&writer->out)) {
sent = write(writer->fd, buf, len);
if (sent < 0) {
switch (errno) {
case ECONNRESET:
case EPIPE:
goto close;
case EINTR:
case EAGAIN:
sent = 0;
break;
default:
writer->errorno = errno;
evcom_perror("send()", writer->errorno);
goto close;
}
}
} /* TODO else { memcpy to last buffer on head } */
assert(sent >= 0);
if ((size_t)sent == len) return; /* sent the whole buffer */
len -= sent;
buf += sent;
evcom_buf *b = evcom_buf_new(buf, len);
evcom_queue_insert_head(&writer->out, &b->queue);
b->written = 0;
assert(writer->fd >= 0);
ev_io_start(D_LOOP_(writer) &writer->write_watcher);
return;
close:
close_writer_asap(writer);
}
void
evcom_writer_close (evcom_writer* writer)
{
writer->flags |= EVCOM_GOT_CLOSE;
if (evcom_queue_empty(&writer->out)) close_writer_asap(writer);
}