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rdkafka_transport.c
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rdkafka_transport.c
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/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 2015-2022, Magnus Edenhill
* 2023, Confluent Inc.
* All rights reserved.
*
* 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 THE COPYRIGHT HOLDERS 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 THE COPYRIGHT OWNER 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.
*/
#ifdef _WIN32
#pragma comment(lib, "ws2_32.lib")
#endif
#define __need_IOV_MAX
#define _DARWIN_C_SOURCE /* MSG_DONTWAIT */
#include "rdkafka_int.h"
#include "rdaddr.h"
#include "rdkafka_transport.h"
#include "rdkafka_transport_int.h"
#include "rdkafka_broker.h"
#include "rdkafka_interceptor.h"
#include <errno.h>
/* AIX doesn't have MSG_DONTWAIT */
#ifndef MSG_DONTWAIT
#define MSG_DONTWAIT MSG_NONBLOCK
#endif
#if WITH_SSL
#include "rdkafka_ssl.h"
#endif
/**< Current thread's rd_kafka_transport_t instance.
* This pointer is set up when calling any OpenSSL APIs that might
* trigger SSL callbacks, and is used to retrieve the SSL object's
* corresponding rd_kafka_transport_t instance.
* There is an set/get_ex_data() API in OpenSSL, but it requires storing
* a unique index somewhere, which we can't do without having a singleton
* object, so instead we cut out the middle man and store the
* rd_kafka_transport_t pointer directly in the thread-local memory. */
RD_TLS rd_kafka_transport_t *rd_kafka_curr_transport;
static int rd_kafka_transport_poll(rd_kafka_transport_t *rktrans, int tmout);
/**
* Low-level socket close
*/
static void rd_kafka_transport_close0(rd_kafka_t *rk, rd_socket_t s) {
if (rk->rk_conf.closesocket_cb)
rk->rk_conf.closesocket_cb((int)s, rk->rk_conf.opaque);
else
rd_socket_close(s);
}
/**
* Close and destroy a transport handle
*/
void rd_kafka_transport_close(rd_kafka_transport_t *rktrans) {
#if WITH_SSL
rd_kafka_curr_transport = rktrans;
if (rktrans->rktrans_ssl)
rd_kafka_transport_ssl_close(rktrans);
#endif
rd_kafka_sasl_close(rktrans);
if (rktrans->rktrans_recv_buf)
rd_kafka_buf_destroy(rktrans->rktrans_recv_buf);
#ifdef _WIN32
WSACloseEvent(rktrans->rktrans_wsaevent);
#endif
if (rktrans->rktrans_s != -1)
rd_kafka_transport_close0(rktrans->rktrans_rkb->rkb_rk,
rktrans->rktrans_s);
rd_free(rktrans);
}
/**
* @brief shutdown(2) a transport's underlying socket.
*
* This will prohibit further sends and receives.
* rd_kafka_transport_close() must still be called to close the socket.
*/
void rd_kafka_transport_shutdown(rd_kafka_transport_t *rktrans) {
shutdown(rktrans->rktrans_s,
#ifdef _WIN32
SD_BOTH
#else
SHUT_RDWR
#endif
);
}
#ifndef _WIN32
/**
* @brief sendmsg() abstraction, converting a list of segments to iovecs.
* @remark should only be called if the number of segments is > 1.
*/
static ssize_t rd_kafka_transport_socket_sendmsg(rd_kafka_transport_t *rktrans,
rd_slice_t *slice,
char *errstr,
size_t errstr_size) {
struct iovec iov[IOV_MAX];
struct msghdr msg = {.msg_iov = iov};
size_t iovlen;
ssize_t r;
size_t r2;
rd_slice_get_iov(slice, msg.msg_iov, &iovlen, IOV_MAX,
/* FIXME: Measure the effects of this */
rktrans->rktrans_sndbuf_size);
msg.msg_iovlen = (int)iovlen;
#ifdef __sun
/* See recvmsg() comment. Setting it here to be safe. */
rd_socket_errno = EAGAIN;
#endif
r = sendmsg(rktrans->rktrans_s, &msg,
MSG_DONTWAIT
#ifdef MSG_NOSIGNAL
| MSG_NOSIGNAL
#endif
);
if (r == -1) {
if (rd_socket_errno == EAGAIN)
return 0;
rd_snprintf(errstr, errstr_size, "%s", rd_strerror(errno));
return -1;
}
/* Update buffer read position */
r2 = rd_slice_read(slice, NULL, (size_t)r);
rd_assert((size_t)r == r2 &&
*"BUG: wrote more bytes than available in slice");
return r;
}
#endif
/**
* @brief Plain send() abstraction
*/
static ssize_t rd_kafka_transport_socket_send0(rd_kafka_transport_t *rktrans,
rd_slice_t *slice,
char *errstr,
size_t errstr_size) {
ssize_t sum = 0;
const void *p;
size_t rlen;
while ((rlen = rd_slice_peeker(slice, &p))) {
ssize_t r;
size_t r2;
r = send(rktrans->rktrans_s, p,
#ifdef _WIN32
(int)rlen, (int)0
#else
rlen, 0
#endif
);
#ifdef _WIN32
if (unlikely(r == RD_SOCKET_ERROR)) {
if (sum > 0 || rd_socket_errno == WSAEWOULDBLOCK) {
rktrans->rktrans_blocked = rd_true;
return sum;
} else {
rd_snprintf(
errstr, errstr_size, "%s",
rd_socket_strerror(rd_socket_errno));
return -1;
}
}
rktrans->rktrans_blocked = rd_false;
#else
if (unlikely(r <= 0)) {
if (r == 0 || rd_socket_errno == EAGAIN)
return 0;
rd_snprintf(errstr, errstr_size, "%s",
rd_socket_strerror(rd_socket_errno));
return -1;
}
#endif
/* Update buffer read position */
r2 = rd_slice_read(slice, NULL, (size_t)r);
rd_assert((size_t)r == r2 &&
*"BUG: wrote more bytes than available in slice");
sum += r;
/* FIXME: remove this and try again immediately and let
* the next write() call fail instead? */
if ((size_t)r < rlen)
break;
}
return sum;
}
static ssize_t rd_kafka_transport_socket_send(rd_kafka_transport_t *rktrans,
rd_slice_t *slice,
char *errstr,
size_t errstr_size) {
#ifndef _WIN32
/* FIXME: Use sendmsg() with iovecs if there's more than one segment
* remaining, otherwise (or if platform does not have sendmsg)
* use plain send(). */
return rd_kafka_transport_socket_sendmsg(rktrans, slice, errstr,
errstr_size);
#endif
return rd_kafka_transport_socket_send0(rktrans, slice, errstr,
errstr_size);
}
#ifndef _WIN32
/**
* @brief recvmsg() abstraction, converting a list of segments to iovecs.
* @remark should only be called if the number of segments is > 1.
*/
static ssize_t rd_kafka_transport_socket_recvmsg(rd_kafka_transport_t *rktrans,
rd_buf_t *rbuf,
char *errstr,
size_t errstr_size) {
ssize_t r;
struct iovec iov[IOV_MAX];
struct msghdr msg = {.msg_iov = iov};
size_t iovlen;
rd_buf_get_write_iov(rbuf, msg.msg_iov, &iovlen, IOV_MAX,
/* FIXME: Measure the effects of this */
rktrans->rktrans_rcvbuf_size);
msg.msg_iovlen = (int)iovlen;
#ifdef __sun
/* SunOS doesn't seem to set errno when recvmsg() fails
* due to no data and MSG_DONTWAIT is set. */
rd_socket_errno = EAGAIN;
#endif
r = recvmsg(rktrans->rktrans_s, &msg, MSG_DONTWAIT);
if (unlikely(r <= 0)) {
if (r == -1 && rd_socket_errno == EAGAIN)
return 0;
else if (r == 0 || (r == -1 && rd_socket_errno == ECONNRESET)) {
/* Receive 0 after POLLIN event means
* connection closed. */
rd_snprintf(errstr, errstr_size, "Disconnected");
return -1;
} else if (r == -1) {
rd_snprintf(errstr, errstr_size, "%s",
rd_strerror(errno));
return -1;
}
}
/* Update buffer write position */
rd_buf_write(rbuf, NULL, (size_t)r);
return r;
}
#endif
/**
* @brief Plain recv()
*/
static ssize_t rd_kafka_transport_socket_recv0(rd_kafka_transport_t *rktrans,
rd_buf_t *rbuf,
char *errstr,
size_t errstr_size) {
ssize_t sum = 0;
void *p;
size_t len;
while ((len = rd_buf_get_writable(rbuf, &p))) {
ssize_t r;
r = recv(rktrans->rktrans_s, p,
#ifdef _WIN32
(int)
#endif
len,
0);
if (unlikely(r == RD_SOCKET_ERROR)) {
if (rd_socket_errno == EAGAIN
#ifdef _WIN32
|| rd_socket_errno == WSAEWOULDBLOCK
#endif
)
return sum;
else {
rd_snprintf(
errstr, errstr_size, "%s",
rd_socket_strerror(rd_socket_errno));
return -1;
}
} else if (unlikely(r == 0)) {
/* Receive 0 after POLLIN event means
* connection closed. */
rd_snprintf(errstr, errstr_size, "Disconnected");
return -1;
}
/* Update buffer write position */
rd_buf_write(rbuf, NULL, (size_t)r);
sum += r;
/* FIXME: remove this and try again immediately and let
* the next recv() call fail instead? */
if ((size_t)r < len)
break;
}
return sum;
}
static ssize_t rd_kafka_transport_socket_recv(rd_kafka_transport_t *rktrans,
rd_buf_t *buf,
char *errstr,
size_t errstr_size) {
#ifndef _WIN32
return rd_kafka_transport_socket_recvmsg(rktrans, buf, errstr,
errstr_size);
#endif
return rd_kafka_transport_socket_recv0(rktrans, buf, errstr,
errstr_size);
}
/**
* CONNECT state is failed (errstr!=NULL) or done (TCP is up, SSL is working..).
* From this state we either hand control back to the broker code,
* or if authentication is configured we ente the AUTH state.
*/
void rd_kafka_transport_connect_done(rd_kafka_transport_t *rktrans,
char *errstr) {
rd_kafka_broker_t *rkb = rktrans->rktrans_rkb;
rd_kafka_curr_transport = rktrans;
rd_kafka_broker_connect_done(rkb, errstr);
}
ssize_t rd_kafka_transport_send(rd_kafka_transport_t *rktrans,
rd_slice_t *slice,
char *errstr,
size_t errstr_size) {
ssize_t r;
#if WITH_SSL
if (rktrans->rktrans_ssl) {
rd_kafka_curr_transport = rktrans;
r = rd_kafka_transport_ssl_send(rktrans, slice, errstr,
errstr_size);
} else
#endif
r = rd_kafka_transport_socket_send(rktrans, slice, errstr,
errstr_size);
return r;
}
ssize_t rd_kafka_transport_recv(rd_kafka_transport_t *rktrans,
rd_buf_t *rbuf,
char *errstr,
size_t errstr_size) {
ssize_t r;
#if WITH_SSL
if (rktrans->rktrans_ssl) {
rd_kafka_curr_transport = rktrans;
r = rd_kafka_transport_ssl_recv(rktrans, rbuf, errstr,
errstr_size);
} else
#endif
r = rd_kafka_transport_socket_recv(rktrans, rbuf, errstr,
errstr_size);
return r;
}
/**
* @brief Notify transport layer of full request sent.
*/
void rd_kafka_transport_request_sent(rd_kafka_broker_t *rkb,
rd_kafka_buf_t *rkbuf) {
rd_kafka_transport_t *rktrans = rkb->rkb_transport;
/* Call on_request_sent interceptors */
rd_kafka_interceptors_on_request_sent(
rkb->rkb_rk, (int)rktrans->rktrans_s, rkb->rkb_name,
rkb->rkb_nodeid, rkbuf->rkbuf_reqhdr.ApiKey,
rkbuf->rkbuf_reqhdr.ApiVersion, rkbuf->rkbuf_corrid,
rd_slice_size(&rkbuf->rkbuf_reader));
}
/**
* Length framed receive handling.
* Currently only supports a the following framing:
* [int32_t:big_endian_length_of_payload][payload]
*
* To be used on POLLIN event, will return:
* -1: on fatal error (errstr will be updated, *rkbufp remains unset)
* 0: still waiting for data (*rkbufp remains unset)
* 1: data complete, (buffer returned in *rkbufp)
*/
int rd_kafka_transport_framed_recv(rd_kafka_transport_t *rktrans,
rd_kafka_buf_t **rkbufp,
char *errstr,
size_t errstr_size) {
rd_kafka_buf_t *rkbuf = rktrans->rktrans_recv_buf;
ssize_t r;
const int log_decode_errors = LOG_ERR;
/* States:
* !rktrans_recv_buf: initial state; set up buf to receive header.
* rkbuf_totlen == 0: awaiting header
* rkbuf_totlen > 0: awaiting payload
*/
if (!rkbuf) {
rkbuf = rd_kafka_buf_new(1, 4 /*length field's length*/);
/* Set up buffer reader for the length field */
rd_buf_write_ensure(&rkbuf->rkbuf_buf, 4, 4);
rktrans->rktrans_recv_buf = rkbuf;
}
r = rd_kafka_transport_recv(rktrans, &rkbuf->rkbuf_buf, errstr,
errstr_size);
if (r == 0)
return 0;
else if (r == -1)
return -1;
if (rkbuf->rkbuf_totlen == 0) {
/* Frame length not known yet. */
int32_t frame_len;
if (rd_buf_write_pos(&rkbuf->rkbuf_buf) < sizeof(frame_len)) {
/* Wait for entire frame header. */
return 0;
}
/* Initialize reader */
rd_slice_init(&rkbuf->rkbuf_reader, &rkbuf->rkbuf_buf, 0, 4);
/* Reader header: payload length */
rd_kafka_buf_read_i32(rkbuf, &frame_len);
if (frame_len < 0 ||
frame_len > rktrans->rktrans_rkb->rkb_rk->rk_conf
.recv_max_msg_size) {
rd_snprintf(errstr, errstr_size,
"Invalid frame size %" PRId32, frame_len);
return -1;
}
rkbuf->rkbuf_totlen = 4 + frame_len;
if (frame_len == 0) {
/* Payload is empty, we're done. */
rktrans->rktrans_recv_buf = NULL;
*rkbufp = rkbuf;
return 1;
}
/* Allocate memory to hold entire frame payload in contigious
* memory. */
rd_buf_write_ensure_contig(&rkbuf->rkbuf_buf, frame_len);
/* Try reading directly, there is probably more data available*/
return rd_kafka_transport_framed_recv(rktrans, rkbufp, errstr,
errstr_size);
}
if (rd_buf_write_pos(&rkbuf->rkbuf_buf) == rkbuf->rkbuf_totlen) {
/* Payload is complete. */
rktrans->rktrans_recv_buf = NULL;
*rkbufp = rkbuf;
return 1;
}
/* Wait for more data */
return 0;
err_parse:
rd_snprintf(errstr, errstr_size, "Frame header parsing failed: %s",
rd_kafka_err2str(rkbuf->rkbuf_err));
return -1;
}
/**
* @brief Final socket setup after a connection has been established
*/
void rd_kafka_transport_post_connect_setup(rd_kafka_transport_t *rktrans) {
rd_kafka_broker_t *rkb = rktrans->rktrans_rkb;
unsigned int slen;
/* Set socket send & receive buffer sizes if configuerd */
if (rkb->rkb_rk->rk_conf.socket_sndbuf_size != 0) {
if (setsockopt(
rktrans->rktrans_s, SOL_SOCKET, SO_SNDBUF,
(void *)&rkb->rkb_rk->rk_conf.socket_sndbuf_size,
sizeof(rkb->rkb_rk->rk_conf.socket_sndbuf_size)) ==
RD_SOCKET_ERROR)
rd_rkb_log(rkb, LOG_WARNING, "SNDBUF",
"Failed to set socket send "
"buffer size to %i: %s",
rkb->rkb_rk->rk_conf.socket_sndbuf_size,
rd_socket_strerror(rd_socket_errno));
}
if (rkb->rkb_rk->rk_conf.socket_rcvbuf_size != 0) {
if (setsockopt(
rktrans->rktrans_s, SOL_SOCKET, SO_RCVBUF,
(void *)&rkb->rkb_rk->rk_conf.socket_rcvbuf_size,
sizeof(rkb->rkb_rk->rk_conf.socket_rcvbuf_size)) ==
RD_SOCKET_ERROR)
rd_rkb_log(rkb, LOG_WARNING, "RCVBUF",
"Failed to set socket receive "
"buffer size to %i: %s",
rkb->rkb_rk->rk_conf.socket_rcvbuf_size,
rd_socket_strerror(rd_socket_errno));
}
/* Get send and receive buffer sizes to allow limiting
* the total number of bytes passed with iovecs to sendmsg()
* and recvmsg(). */
slen = sizeof(rktrans->rktrans_rcvbuf_size);
if (getsockopt(rktrans->rktrans_s, SOL_SOCKET, SO_RCVBUF,
(void *)&rktrans->rktrans_rcvbuf_size,
&slen) == RD_SOCKET_ERROR) {
rd_rkb_log(rkb, LOG_WARNING, "RCVBUF",
"Failed to get socket receive "
"buffer size: %s: assuming 1MB",
rd_socket_strerror(rd_socket_errno));
rktrans->rktrans_rcvbuf_size = 1024 * 1024;
} else if (rktrans->rktrans_rcvbuf_size < 1024 * 64)
rktrans->rktrans_rcvbuf_size =
1024 * 64; /* Use at least 64KB */
slen = sizeof(rktrans->rktrans_sndbuf_size);
if (getsockopt(rktrans->rktrans_s, SOL_SOCKET, SO_SNDBUF,
(void *)&rktrans->rktrans_sndbuf_size,
&slen) == RD_SOCKET_ERROR) {
rd_rkb_log(rkb, LOG_WARNING, "RCVBUF",
"Failed to get socket send "
"buffer size: %s: assuming 1MB",
rd_socket_strerror(rd_socket_errno));
rktrans->rktrans_sndbuf_size = 1024 * 1024;
} else if (rktrans->rktrans_sndbuf_size < 1024 * 64)
rktrans->rktrans_sndbuf_size =
1024 * 64; /* Use at least 64KB */
#ifdef TCP_NODELAY
if (rkb->rkb_rk->rk_conf.socket_nagle_disable) {
int one = 1;
if (setsockopt(rktrans->rktrans_s, IPPROTO_TCP, TCP_NODELAY,
(void *)&one, sizeof(one)) == RD_SOCKET_ERROR)
rd_rkb_log(rkb, LOG_WARNING, "NAGLE",
"Failed to disable Nagle (TCP_NODELAY) "
"on socket: %s",
rd_socket_strerror(rd_socket_errno));
}
#endif
}
/**
* TCP connection established.
* Set up socket options, SSL, etc.
*
* Locality: broker thread
*/
static void rd_kafka_transport_connected(rd_kafka_transport_t *rktrans) {
rd_kafka_broker_t *rkb = rktrans->rktrans_rkb;
rd_rkb_dbg(
rkb, BROKER, "CONNECT", "Connected to %s",
rd_sockaddr2str(rkb->rkb_addr_last,
RD_SOCKADDR2STR_F_PORT | RD_SOCKADDR2STR_F_FAMILY));
rd_kafka_transport_post_connect_setup(rktrans);
#if WITH_SSL
if (rkb->rkb_proto == RD_KAFKA_PROTO_SSL ||
rkb->rkb_proto == RD_KAFKA_PROTO_SASL_SSL) {
char errstr[512];
rd_kafka_broker_lock(rkb);
rd_kafka_broker_set_state(rkb,
RD_KAFKA_BROKER_STATE_SSL_HANDSHAKE);
rd_kafka_broker_unlock(rkb);
/* Set up SSL connection.
* This is also an asynchronous operation so dont
* propagate to broker_connect_done() just yet. */
if (rd_kafka_transport_ssl_connect(rkb, rktrans, errstr,
sizeof(errstr)) == -1) {
rd_kafka_transport_connect_done(rktrans, errstr);
return;
}
return;
}
#endif
/* Propagate connect success */
rd_kafka_transport_connect_done(rktrans, NULL);
}
/**
* @brief the kernel SO_ERROR in \p errp for the given transport.
* @returns 0 if getsockopt() was succesful (and \p and errp can be trusted),
* else -1 in which case \p errp 's value is undefined.
*/
static int rd_kafka_transport_get_socket_error(rd_kafka_transport_t *rktrans,
int *errp) {
socklen_t intlen = sizeof(*errp);
if (getsockopt(rktrans->rktrans_s, SOL_SOCKET, SO_ERROR, (void *)errp,
&intlen) == -1) {
rd_rkb_dbg(rktrans->rktrans_rkb, BROKER, "SO_ERROR",
"Failed to get socket error: %s",
rd_socket_strerror(rd_socket_errno));
return -1;
}
return 0;
}
/**
* IO event handler.
*
* @param socket_errstr Is an optional (else NULL) error string from the
* socket layer.
*
* Locality: broker thread
*/
static void rd_kafka_transport_io_event(rd_kafka_transport_t *rktrans,
int events,
const char *socket_errstr) {
char errstr[512];
int r;
rd_kafka_broker_t *rkb = rktrans->rktrans_rkb;
switch (rkb->rkb_state) {
case RD_KAFKA_BROKER_STATE_CONNECT:
/* Asynchronous connect finished, read status. */
if (!(events & (POLLOUT | POLLERR | POLLHUP)))
return;
if (socket_errstr)
rd_kafka_broker_fail(
rkb, LOG_ERR, RD_KAFKA_RESP_ERR__TRANSPORT,
"Connect to %s failed: %s",
rd_sockaddr2str(rkb->rkb_addr_last,
RD_SOCKADDR2STR_F_PORT |
RD_SOCKADDR2STR_F_FAMILY),
socket_errstr);
else if (rd_kafka_transport_get_socket_error(rktrans, &r) ==
-1) {
rd_kafka_broker_fail(
rkb, LOG_ERR, RD_KAFKA_RESP_ERR__TRANSPORT,
"Connect to %s failed: "
"unable to get status from "
"socket %d: %s",
rd_sockaddr2str(rkb->rkb_addr_last,
RD_SOCKADDR2STR_F_PORT |
RD_SOCKADDR2STR_F_FAMILY),
rktrans->rktrans_s, rd_strerror(rd_socket_errno));
} else if (r != 0) {
/* Connect failed */
rd_snprintf(
errstr, sizeof(errstr), "Connect to %s failed: %s",
rd_sockaddr2str(rkb->rkb_addr_last,
RD_SOCKADDR2STR_F_PORT |
RD_SOCKADDR2STR_F_FAMILY),
rd_strerror(r));
rd_kafka_transport_connect_done(rktrans, errstr);
} else {
/* Connect succeeded */
rd_kafka_transport_connected(rktrans);
}
break;
case RD_KAFKA_BROKER_STATE_SSL_HANDSHAKE:
#if WITH_SSL
rd_assert(rktrans->rktrans_ssl);
/* Currently setting up SSL connection:
* perform handshake. */
r = rd_kafka_transport_ssl_handshake(rktrans);
if (r == 0 /* handshake still in progress */ &&
(events & POLLHUP)) {
rd_kafka_broker_conn_closed(
rkb, RD_KAFKA_RESP_ERR__TRANSPORT, "Disconnected");
return;
}
#else
RD_NOTREACHED();
#endif
break;
case RD_KAFKA_BROKER_STATE_AUTH_LEGACY:
/* SASL authentication.
* Prior to broker version v1.0.0 this is performed
* directly on the socket without Kafka framing. */
if (rd_kafka_sasl_io_event(rktrans, events, errstr,
sizeof(errstr)) == -1) {
rd_kafka_broker_fail(
rkb, LOG_ERR, RD_KAFKA_RESP_ERR__AUTHENTICATION,
"SASL authentication failure: %s", errstr);
return;
}
if (events & POLLHUP) {
rd_kafka_broker_fail(rkb, LOG_ERR,
RD_KAFKA_RESP_ERR__AUTHENTICATION,
"Disconnected");
return;
}
break;
case RD_KAFKA_BROKER_STATE_APIVERSION_QUERY:
case RD_KAFKA_BROKER_STATE_AUTH_HANDSHAKE:
case RD_KAFKA_BROKER_STATE_AUTH_REQ:
case RD_KAFKA_BROKER_STATE_UP:
case RD_KAFKA_BROKER_STATE_UPDATE:
if (events & POLLIN) {
while (rkb->rkb_state >= RD_KAFKA_BROKER_STATE_UP &&
rd_kafka_recv(rkb) > 0)
;
/* If connection went down: bail out early */
if (rkb->rkb_state == RD_KAFKA_BROKER_STATE_DOWN)
return;
}
if (events & POLLHUP) {
rd_kafka_broker_conn_closed(
rkb, RD_KAFKA_RESP_ERR__TRANSPORT, "Disconnected");
return;
}
if (events & POLLOUT) {
while (rd_kafka_send(rkb) > 0)
;
}
break;
case RD_KAFKA_BROKER_STATE_INIT:
case RD_KAFKA_BROKER_STATE_DOWN:
case RD_KAFKA_BROKER_STATE_TRY_CONNECT:
case RD_KAFKA_BROKER_STATE_REAUTH:
rd_kafka_assert(rkb->rkb_rk, !*"bad state");
}
}
#ifdef _WIN32
/**
* @brief Convert WSA FD_.. events to POLL.. events.
*/
static RD_INLINE int rd_kafka_transport_wsa2events(long wevents) {
int events = 0;
if (unlikely(wevents == 0))
return 0;
if (wevents & FD_READ)
events |= POLLIN;
if (wevents & (FD_WRITE | FD_CONNECT))
events |= POLLOUT;
if (wevents & FD_CLOSE)
events |= POLLHUP;
rd_dassert(events != 0);
return events;
}
/**
* @brief Convert POLL.. events to WSA FD_.. events.
*/
static RD_INLINE int rd_kafka_transport_events2wsa(int events,
rd_bool_t is_connecting) {
long wevents = FD_CLOSE;
if (unlikely(is_connecting))
return wevents | FD_CONNECT;
if (events & POLLIN)
wevents |= FD_READ;
if (events & POLLOUT)
wevents |= FD_WRITE;
return wevents;
}
/**
* @returns the WinSocket events (as POLL.. events) for the broker socket.
*/
static int rd_kafka_transport_get_wsa_events(rd_kafka_transport_t *rktrans) {
const int try_bits[4 * 2] = {FD_READ_BIT, POLLIN, FD_WRITE_BIT,
POLLOUT, FD_CONNECT_BIT, POLLOUT,
FD_CLOSE_BIT, POLLHUP};
int r, i;
WSANETWORKEVENTS netevents;
int events = 0;
const char *socket_errstr = NULL;
rd_kafka_broker_t *rkb = rktrans->rktrans_rkb;
/* Get Socket event */
r = WSAEnumNetworkEvents(rktrans->rktrans_s, rktrans->rktrans_wsaevent,
&netevents);
if (unlikely(r == SOCKET_ERROR)) {
rd_rkb_log(rkb, LOG_ERR, "WSAWAIT",
"WSAEnumNetworkEvents() failed: %s",
rd_socket_strerror(rd_socket_errno));
socket_errstr = rd_socket_strerror(rd_socket_errno);
return POLLHUP | POLLERR;
}
/* Get fired events and errors for each event type */
for (i = 0; i < RD_ARRAYSIZE(try_bits); i += 2) {
const int bit = try_bits[i];
const int event = try_bits[i + 1];
if (!(netevents.lNetworkEvents & (1 << bit)))
continue;
if (unlikely(netevents.iErrorCode[bit])) {
socket_errstr =
rd_socket_strerror(netevents.iErrorCode[bit]);
events |= POLLHUP;
} else {
events |= event;
if (bit == FD_WRITE_BIT) {
/* Writing no longer blocked */
rktrans->rktrans_blocked = rd_false;
}
}
}
return events;
}
/**
* @brief Win32: Poll transport and \p rkq cond events.
*
* @returns the transport socket POLL.. event bits.
*/
static int rd_kafka_transport_io_serve_win32(rd_kafka_transport_t *rktrans,
rd_kafka_q_t *rkq,
int timeout_ms) {
const DWORD wsaevent_cnt = 3;
WSAEVENT wsaevents[3] = {
rkq->rkq_cond.mEvents[0], /* rkq: cnd_signal */
rkq->rkq_cond.mEvents[1], /* rkq: cnd_broadcast */
rktrans->rktrans_wsaevent, /* socket */
};
DWORD r;
int events = 0;
rd_kafka_broker_t *rkb = rktrans->rktrans_rkb;
rd_bool_t set_pollout = rd_false;
rd_bool_t cnd_is_waiting = rd_false;
/* WSA only sets FD_WRITE (e.g., POLLOUT) when the socket was
* previously blocked, unlike BSD sockets that set POLLOUT as long as
* the socket isn't blocked. So we need to imitate the BSD behaviour
* here and cut the timeout short if a write is wanted and the socket
* is not currently blocked. */
if (rktrans->rktrans_rkb->rkb_state != RD_KAFKA_BROKER_STATE_CONNECT &&
!rktrans->rktrans_blocked &&
(rktrans->rktrans_pfd[0].events & POLLOUT)) {
timeout_ms = 0;
set_pollout = rd_true;
} else {
/* Check if the queue already has ops enqueued in which case we
* cut the timeout short. Else add this thread as waiting on the
* queue's condvar so that cnd_signal() (et.al.) will perform
* SetEvent() and thus wake up this thread in case a new op is
* added to the queue. */
mtx_lock(&rkq->rkq_lock);
if (rkq->rkq_qlen > 0) {
timeout_ms = 0;
} else {
cnd_is_waiting = rd_true;
cnd_wait_enter(&rkq->rkq_cond);
}
mtx_unlock(&rkq->rkq_lock);
}
/* Wait for IO and queue events */
r = WSAWaitForMultipleEvents(wsaevent_cnt, wsaevents, FALSE, timeout_ms,
FALSE);
if (cnd_is_waiting) {
mtx_lock(&rkq->rkq_lock);
cnd_wait_exit(&rkq->rkq_cond);
mtx_unlock(&rkq->rkq_lock);
}
if (unlikely(r == WSA_WAIT_FAILED)) {
rd_rkb_log(rkb, LOG_CRIT, "WSAWAIT",
"WSAWaitForMultipleEvents failed: %s",
rd_socket_strerror(rd_socket_errno));
return POLLERR;
} else if (r != WSA_WAIT_TIMEOUT) {
r -= WSA_WAIT_EVENT_0;
/* Reset the cond events if any of them were triggered */
if (r < 2) {
ResetEvent(rkq->rkq_cond.mEvents[0]);
ResetEvent(rkq->rkq_cond.mEvents[1]);
}
/* Get the socket events. */
events = rd_kafka_transport_get_wsa_events(rktrans);
}
/* As explained above we need to set the POLLOUT flag
* in case it is wanted but not triggered by Winsocket so that
* io_event() knows it can attempt to send more data. */
if (likely(set_pollout && !(events & (POLLHUP | POLLERR | POLLOUT))))
events |= POLLOUT;
return events;
}
#endif
/**
* @brief Poll and serve IOs
*
* @returns 0 if \p rkq may need additional blocking/timeout polling, else 1.
*
* @locality broker thread
*/