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viosocket.c
1301 lines (1077 loc) · 33.9 KB
/
viosocket.c
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/*
Copyright (c) 2001, 2012, Oracle and/or its affiliates
Copyright (c) 2012, Monty Program Ab
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; version 2 of
the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1335 USA */
/*
Note that we can't have assertion on file descriptors; The reason for
this is that during mysql shutdown, another thread can close a file
we are working on. In this case we should just return read errors from
the file descriptior.
*/
#include "vio_priv.h"
#ifdef _WIN32
#include <winsock2.h>
#include <MSWSock.h>
#include <mstcpip.h>
#pragma comment(lib, "ws2_32.lib")
#endif
#ifdef FIONREAD_IN_SYS_FILIO
# include <sys/filio.h>
#endif
/* Network io wait callbacks for threadpool */
static void (*before_io_wait)(void)= 0;
static void (*after_io_wait)(void)= 0;
/* Wait callback macros (both performance schema and threadpool */
#define START_SOCKET_WAIT(locker, state_ptr, sock, which, timeout) \
do \
{ \
MYSQL_START_SOCKET_WAIT(locker, state_ptr, sock, \
which, 0); \
if (timeout && before_io_wait) \
before_io_wait(); \
} while(0)
#define END_SOCKET_WAIT(locker,timeout) \
do \
{ \
MYSQL_END_SOCKET_WAIT(locker, 0); \
if (timeout && after_io_wait) \
after_io_wait(); \
} while(0)
void vio_set_wait_callback(void (*before_wait)(void),
void (*after_wait)(void))
{
before_io_wait= before_wait;
after_io_wait= after_wait;
}
int vio_errno(Vio *vio __attribute__((unused)))
{
/* These transport types are not Winsock based. */
#ifdef _WIN32
if (vio->type == VIO_TYPE_NAMEDPIPE)
return GetLastError();
#endif
/* Mapped to WSAGetLastError() on Win32. */
return socket_errno;
}
static int vio_set_linger(my_socket s, unsigned short timeout_sec)
{
struct linger s_linger;
int ret;
s_linger.l_onoff = 1;
s_linger.l_linger = timeout_sec;
ret = setsockopt(s, SOL_SOCKET, SO_LINGER, (const char *)&s_linger, (int)sizeof(s_linger));
return ret;
}
/**
Attempt to wait for an I/O event on a socket.
@param vio VIO object representing a connected socket.
@param event The type of I/O event (read or write) to wait for.
@return Return value is -1 on failure, 0 on success.
*/
int vio_socket_io_wait(Vio *vio, enum enum_vio_io_event event)
{
int timeout, ret;
DBUG_ASSERT(event == VIO_IO_EVENT_READ || event == VIO_IO_EVENT_WRITE);
/* Choose an appropriate timeout. */
if (event == VIO_IO_EVENT_READ)
timeout= vio->read_timeout;
else
timeout= vio->write_timeout;
/* Wait for input data to become available. */
switch (vio_io_wait(vio, event, timeout))
{
case -1:
/* Upon failure, vio_read/write() shall return -1. */
ret= -1;
break;
case 0:
/* The wait timed out. */
ret= -1;
vio_set_linger(vio->mysql_socket.fd, 0);
break;
default:
/* A positive value indicates an I/O event. */
ret= 0;
break;
}
return ret;
}
/*
Define a stub MSG_DONTWAIT if unavailable. In this case, fcntl
(or a equivalent) is used to enable non-blocking operations.
The flag must be supported in both send and recv operations.
*/
#if defined(__linux__)
#define VIO_USE_DONTWAIT 1
#define VIO_DONTWAIT MSG_DONTWAIT
#else
#define VIO_DONTWAIT 0
#endif
#ifndef SOCKET_EAGAIN
#define SOCKET_EAGAIN SOCKET_EWOULDBLOCK
#endif
/*
returns number of bytes read or -1 in case of an error
*/
size_t vio_read(Vio *vio, uchar *buf, size_t size)
{
ssize_t ret;
int flags= 0;
DBUG_ENTER("vio_read");
DBUG_PRINT("enter", ("sd: %d buf: %p size: %zu",
(int)mysql_socket_getfd(vio->mysql_socket), buf,
size));
/* Ensure nobody uses vio_read_buff and vio_read simultaneously. */
DBUG_ASSERT(vio->read_end == vio->read_pos);
/* If timeout is enabled, do not block if data is unavailable. */
if (vio->read_timeout >= 0)
flags= VIO_DONTWAIT;
while ((ret= mysql_socket_recv(vio->mysql_socket, (SOCKBUF_T *)buf, size,
flags)) == -1)
{
int error= socket_errno;
/* The operation would block? */
if (error != SOCKET_EAGAIN && error != SOCKET_EWOULDBLOCK)
break;
/* Wait for input data to become available. */
if ((ret= vio_socket_io_wait(vio, VIO_IO_EVENT_READ)))
break;
}
#ifndef DBUG_OFF
if (ret == -1)
{
DBUG_PRINT("vio_error", ("Got error %d during read", errno));
}
#ifndef DEBUG_DATA_PACKETS
else
{
DBUG_DUMP("read_data", buf, ret);
}
#endif /* DEBUG_DATA_PACKETS */
#endif /* DBUG_OFF */
DBUG_PRINT("exit", ("%d", (int) ret));
DBUG_RETURN(ret);
}
/*
Buffered read: if average read size is small it may
reduce number of syscalls.
*/
size_t vio_read_buff(Vio *vio, uchar* buf, size_t size)
{
size_t rc;
#define VIO_UNBUFFERED_READ_MIN_SIZE 2048
DBUG_ENTER("vio_read_buff");
DBUG_PRINT("enter", ("sd: %d buf: %p size:%zu",
(int)mysql_socket_getfd(vio->mysql_socket),
buf, size));
if (vio->read_pos < vio->read_end)
{
rc= MY_MIN((size_t) (vio->read_end - vio->read_pos), size);
memcpy(buf, vio->read_pos, rc);
vio->read_pos+= rc;
/*
Do not try to read from the socket now even if rc < size:
vio_read can return -1 due to an error or non-blocking mode, and
the safest way to handle it is to move to a separate branch.
*/
}
else if (size < VIO_UNBUFFERED_READ_MIN_SIZE)
{
rc= vio_read(vio, (uchar*) vio->read_buffer, VIO_READ_BUFFER_SIZE);
if (rc != 0 && rc != (size_t) -1)
{
if (rc > size)
{
vio->read_pos= vio->read_buffer + size;
vio->read_end= vio->read_buffer + rc;
rc= size;
}
memcpy(buf, vio->read_buffer, rc);
}
}
else
rc= vio_read(vio, buf, size);
DBUG_RETURN(rc);
#undef VIO_UNBUFFERED_READ_MIN_SIZE
}
my_bool vio_buff_has_data(Vio *vio)
{
return (vio->read_pos != vio->read_end);
}
size_t vio_write(Vio *vio, const uchar* buf, size_t size)
{
ssize_t ret;
int flags= 0;
DBUG_ENTER("vio_write");
DBUG_PRINT("enter", ("sd: %d buf: %p size: %zu",
(int)mysql_socket_getfd(vio->mysql_socket), buf,
size));
/* If timeout is enabled, do not block. */
if (vio->write_timeout >= 0)
flags= VIO_DONTWAIT;
while ((ret= mysql_socket_send(vio->mysql_socket, (SOCKBUF_T *)buf, size,
flags)) == -1)
{
int error= socket_errno;
/* The operation would block? */
if (error != SOCKET_EAGAIN && error != SOCKET_EWOULDBLOCK)
break;
/* Wait for the output buffer to become writable.*/
if ((ret= vio_socket_io_wait(vio, VIO_IO_EVENT_WRITE)))
break;
}
#ifndef DBUG_OFF
if (ret == -1)
{
DBUG_PRINT("vio_error", ("Got error on write: %d",socket_errno));
}
#endif /* DBUG_OFF */
DBUG_PRINT("exit", ("%d", (int) ret));
DBUG_RETURN(ret);
}
int vio_socket_shutdown(Vio *vio, int how)
{
int ret= shutdown(mysql_socket_getfd(vio->mysql_socket), how);
#ifdef _WIN32
/* Cancel possible IO in progress (shutdown does not do that on Windows). */
(void) CancelIoEx((HANDLE)mysql_socket_getfd(vio->mysql_socket), NULL);
#endif
return ret;
}
int vio_blocking(Vio *vio, my_bool set_blocking_mode, my_bool *old_mode)
{
int r= 0;
#if defined(_WIN32) || !defined(NO_FCNTL_NONBLOCK)
my_socket sd= mysql_socket_getfd(vio->mysql_socket);
#endif
DBUG_ENTER("vio_blocking");
*old_mode= MY_TEST(!(vio->fcntl_mode & O_NONBLOCK));
DBUG_PRINT("enter", ("set_blocking_mode: %d old_mode: %d",
(int) set_blocking_mode, (int) *old_mode));
#if !defined(_WIN32)
#if !defined(NO_FCNTL_NONBLOCK)
if (sd >= 0)
{
int old_fcntl= vio->fcntl_mode;
if (set_blocking_mode)
vio->fcntl_mode &= ~O_NONBLOCK; /* clear bit */
else
vio->fcntl_mode |= O_NONBLOCK; /* set bit */
if (old_fcntl != vio->fcntl_mode)
{
r= fcntl(sd, F_SETFL, vio->fcntl_mode);
if (r == -1)
{
DBUG_PRINT("info", ("fcntl failed, errno %d", errno));
vio->fcntl_mode= old_fcntl;
}
}
}
#else
r= set_blocking_mode ? 0 : 1;
#endif /* !defined(NO_FCNTL_NONBLOCK) */
#else /* !defined(_WIN32) */
if (vio->type != VIO_TYPE_NAMEDPIPE)
{
ulong arg;
int old_fcntl=vio->fcntl_mode;
if (set_blocking_mode)
{
arg = 0;
vio->fcntl_mode &= ~O_NONBLOCK; /* clear bit */
}
else
{
arg = 1;
vio->fcntl_mode |= O_NONBLOCK; /* set bit */
}
if (old_fcntl != vio->fcntl_mode)
r = ioctlsocket(sd,FIONBIO,(void*) &arg);
}
else
r= MY_TEST(!(vio->fcntl_mode & O_NONBLOCK)) != set_blocking_mode;
#endif /* !defined(_WIN32) */
DBUG_PRINT("exit", ("%d", r));
DBUG_RETURN(r);
}
/*
Check if vio is blocking
@retval 0 is not blocking
@retval 1 is blocking
*/
my_bool
vio_is_blocking(Vio * vio)
{
my_bool r;
DBUG_ENTER("vio_is_blocking");
r = !(vio->fcntl_mode & O_NONBLOCK);
DBUG_PRINT("exit", ("%d", (int) r));
DBUG_RETURN(r);
}
int vio_socket_timeout(Vio *vio,
uint which __attribute__((unused)),
my_bool old_mode __attribute__((unused)))
{
int ret= 0;
DBUG_ENTER("vio_socket_timeout");
/*
The MSG_DONTWAIT trick is not used with SSL sockets as the send and
receive I/O operations are wrapped through SSL-specific functions
(SSL_read and SSL_write) which are not equivalent to the standard
recv(2) and send(2) used in vio_read() and vio_write(). Hence, the
socket blocking mode is changed and vio_io_wait() is used to wait
for I/O or timeout.
*/
#ifdef VIO_USE_DONTWAIT
if (vio->type == VIO_TYPE_SSL)
#endif
{
/* Deduce what should be the new blocking mode of the socket. */
my_bool new_mode= vio->write_timeout < 0 && vio->read_timeout < 0;
my_bool not_used;
/* If necessary, update the blocking mode. */
if (new_mode != old_mode)
ret= vio_blocking(vio, new_mode, ¬_used);
}
DBUG_RETURN(ret);
}
/* Set TCP_NODELAY (disable Nagle's algorithm */
int vio_nodelay(Vio *vio, my_bool on)
{
int r;
int no_delay= MY_TEST(on);
DBUG_ENTER("vio_nodelay");
if (vio->type == VIO_TYPE_NAMEDPIPE || vio->type == VIO_TYPE_SOCKET)
{
DBUG_RETURN(0);
}
r = mysql_socket_setsockopt(vio->mysql_socket, IPPROTO_TCP, TCP_NODELAY,
IF_WIN((const char*), (void*)) &no_delay,
sizeof(no_delay));
if (r)
{
DBUG_PRINT("warning",
("Couldn't set socket option for fast send, error %d",
socket_errno));
r = -1;
}
DBUG_PRINT("exit", ("%d", r));
DBUG_RETURN(r);
}
int vio_fastsend(Vio * vio)
{
int r=0;
DBUG_ENTER("vio_fastsend");
if (vio->type == VIO_TYPE_NAMEDPIPE)
{
DBUG_RETURN(0);
}
#if defined(IPTOS_THROUGHPUT)
{
int tos = IPTOS_THROUGHPUT;
r= mysql_socket_setsockopt(vio->mysql_socket, IPPROTO_IP, IP_TOS,
(void *)&tos, sizeof(tos));
}
#endif /* IPTOS_THROUGHPUT */
if (!r)
r = vio_nodelay(vio, TRUE);
if (r)
{
DBUG_PRINT("warning",
("Couldn't set socket option for fast send, error %d",
socket_errno));
r= -1;
}
DBUG_PRINT("exit", ("%d", r));
DBUG_RETURN(r);
}
int vio_keepalive(Vio* vio, my_bool set_keep_alive)
{
int r=0;
uint opt = 0;
DBUG_ENTER("vio_keepalive");
DBUG_PRINT("enter", ("sd: %d set_keep_alive: %d",
(int)mysql_socket_getfd(vio->mysql_socket),
(int)set_keep_alive));
if (vio->type != VIO_TYPE_NAMEDPIPE)
{
if (set_keep_alive)
opt = 1;
r = mysql_socket_setsockopt(vio->mysql_socket, SOL_SOCKET, SO_KEEPALIVE,
(char *)&opt, sizeof(opt));
}
DBUG_RETURN(r);
}
/*
Set socket options for keepalive e.g., TCP_KEEPCNT, TCP_KEEPIDLE/TCP_KEEPALIVE, TCP_KEEPINTVL
*/
int vio_set_keepalive_options(Vio* vio, const struct vio_keepalive_opts *opts)
{
#if defined _WIN32
struct tcp_keepalive s;
DWORD nbytes;
if (vio->type == VIO_TYPE_NAMEDPIPE)
return 0;
if (!opts->idle && !opts->interval)
return 0;
s.onoff= 1;
s.keepalivetime= opts->idle? opts->idle * 1000 : 7200;
s.keepaliveinterval= opts->interval?opts->interval * 1000 : 1;
return WSAIoctl(vio->mysql_socket.fd, SIO_KEEPALIVE_VALS, (LPVOID) &s, sizeof(s),
NULL, 0, &nbytes, NULL, NULL);
#elif defined (TCP_KEEPIDLE) || defined (TCP_KEEPALIVE)
int ret= 0;
if (opts->idle)
{
#ifdef TCP_KEEPIDLE // Linux only
ret= mysql_socket_setsockopt(vio->mysql_socket, IPPROTO_TCP, TCP_KEEPIDLE, (char *)&opts->idle, sizeof(opts->idle));
#elif defined (TCP_KEEPALIVE)
ret= mysql_socket_setsockopt(vio->mysql_socket, IPPROTO_TCP, TCP_KEEPALIVE, (char *)&opts->idle, sizeof(opts->idle));
#endif
if(ret)
return ret;
}
#ifdef TCP_KEEPCNT // Linux only
if(opts->probes)
{
ret= mysql_socket_setsockopt(vio->mysql_socket, IPPROTO_TCP, TCP_KEEPCNT, (char *)&opts->probes, sizeof(opts->probes));
if(ret)
return ret;
}
#endif
#ifdef TCP_KEEPINTVL // Linux only
if(opts->interval)
{
ret= mysql_socket_setsockopt(vio->mysql_socket, IPPROTO_TCP, TCP_KEEPINTVL, (char *)&opts->interval, sizeof(opts->interval));
}
#endif
return ret;
#else /*TCP_KEEPIDLE || TCP_KEEPALIVE */
return -1;
#endif
}
/**
Indicate whether a I/O operation must be retried later.
@param vio A VIO object
@return Whether a I/O operation should be deferred.
@retval TRUE Temporary failure, retry operation.
@retval FALSE Indeterminate failure.
*/
my_bool
vio_should_retry(Vio *vio)
{
DBUG_ENTER("vio_should_retry");
DBUG_PRINT("info", ("vio_errno: %d", vio_errno(vio)));
DBUG_RETURN(vio_errno(vio) == SOCKET_EINTR);
}
/**
Indicate whether a I/O operation timed out.
@param vio A VIO object
@return Whether a I/O operation timed out.
@retval TRUE Operation timed out.
@retval FALSE Not a timeout failure.
*/
my_bool
vio_was_timeout(Vio *vio)
{
return (vio_errno(vio) == SOCKET_ETIMEDOUT);
}
int vio_close(Vio *vio)
{
int r=0;
DBUG_ENTER("vio_close");
DBUG_PRINT("enter", ("sd: %d", (int)mysql_socket_getfd(vio->mysql_socket)));
if (vio->type != VIO_CLOSED)
{
DBUG_ASSERT(vio->type == VIO_TYPE_TCPIP ||
vio->type == VIO_TYPE_SOCKET ||
vio->type == VIO_TYPE_SSL);
DBUG_ASSERT(mysql_socket_getfd(vio->mysql_socket) >= 0);
if (mysql_socket_close(vio->mysql_socket))
r= -1;
}
if (r)
{
DBUG_PRINT("vio_error", ("close() failed, error: %d",socket_errno));
/* FIXME: error handling (not critical for MySQL) */
}
vio->type= VIO_CLOSED;
vio->mysql_socket= MYSQL_INVALID_SOCKET;
DBUG_RETURN(r);
}
const char *vio_description(Vio * vio)
{
return vio->desc;
}
enum enum_vio_type vio_type(Vio* vio)
{
return vio->type;
}
static const LEX_CSTRING vio_type_names[] =
{
{ STRING_WITH_LEN("") }, // internal threads
{ STRING_WITH_LEN("TCP/IP") },
{ STRING_WITH_LEN("Socket") },
{ STRING_WITH_LEN("Named Pipe") },
{ STRING_WITH_LEN("SSL/TLS") },
{ STRING_WITH_LEN("Shared Memory") }
};
const char *vio_type_name(enum enum_vio_type vio_type, size_t *len)
{
int index= vio_type >= FIRST_VIO_TYPE && vio_type <= LAST_VIO_TYPE
? vio_type : 0;
*len= vio_type_names[index].length;
return vio_type_names[index].str;
}
my_socket vio_fd(Vio* vio)
{
return mysql_socket_getfd(vio->mysql_socket);
}
/**
Convert a sock-address (AF_INET or AF_INET6) into the "normalized" form,
which is the IPv4 form for IPv4-mapped or IPv4-compatible IPv6 addresses.
@note Background: when IPv4 and IPv6 are used simultaneously, IPv4
addresses may be written in a form of IPv4-mapped or IPv4-compatible IPv6
addresses. That means, one address (a.b.c.d) can be written in three forms:
- IPv4: a.b.c.d;
- IPv4-compatible IPv6: ::a.b.c.d;
- IPv4-mapped IPv4: ::ffff:a.b.c.d;
Having three forms of one address makes it a little difficult to compare
addresses with each other (the IPv4-compatible IPv6-address of foo.bar
will be different from the IPv4-mapped IPv6-address of foo.bar).
@note This function can be made public when it's needed.
@param src [in] source IP address (AF_INET or AF_INET6).
@param src_length [in] length of the src.
@param dst [out] a buffer to store normalized IP address
(sockaddr_storage).
@param dst_length [out] optional - actual length of the normalized IP address.
*/
void vio_get_normalized_ip(const struct sockaddr *src, size_t src_length,
struct sockaddr *dst)
{
switch (src->sa_family) {
case AF_INET:
memcpy(dst, src, src_length);
break;
#ifdef HAVE_IPV6
case AF_INET6:
{
const struct sockaddr_in6 *src_addr6= (const struct sockaddr_in6 *) src;
const struct in6_addr *src_ip6= &(src_addr6->sin6_addr);
const uint32 *src_ip6_int32= (uint32 *) src_ip6->s6_addr;
if (IN6_IS_ADDR_V4MAPPED(src_ip6) || IN6_IS_ADDR_V4COMPAT(src_ip6))
{
struct sockaddr_in *dst_ip4= (struct sockaddr_in *) dst;
/*
This is an IPv4-mapped or IPv4-compatible IPv6 address. It should
be converted to the IPv4 form.
*/
memset(dst_ip4, 0, sizeof (struct sockaddr_in));
dst_ip4->sin_family= AF_INET;
dst_ip4->sin_port= src_addr6->sin6_port;
/*
In an IPv4 mapped or compatible address, the last 32 bits represent
the IPv4 address. The byte orders for IPv6 and IPv4 addresses are
the same, so a simple copy is possible.
*/
dst_ip4->sin_addr.s_addr= src_ip6_int32[3];
}
else
{
/* This is a "native" IPv6 address. */
memcpy(dst, src, src_length);
}
break;
}
#endif /* HAVE_IPV6 */
}
}
/**
Return the normalized IP address string for a sock-address.
The idea is to return an IPv4-address for an IPv4-mapped and
IPv4-compatible IPv6 address.
The function writes the normalized IP address to the given buffer.
The buffer should have enough space, otherwise error flag is returned.
The system constant INET6_ADDRSTRLEN can be used to reserve buffers of
the right size.
@param addr [in] sockaddr object (AF_INET or AF_INET6).
@param addr_length [in] length of the addr.
@param ip_string [out] buffer to write normalized IP address.
@param ip_string_size [in] size of the ip_string.
@return Error status.
@retval TRUE in case of error (the ip_string buffer is not enough).
@retval FALSE on success.
*/
my_bool vio_get_normalized_ip_string(const struct sockaddr *addr, size_t addr_length,
char *ip_string,
size_t ip_string_size)
{
struct sockaddr_storage norm_addr_storage;
struct sockaddr *norm_addr= (struct sockaddr *) &norm_addr_storage;
int err_code;
vio_get_normalized_ip(addr, addr_length, norm_addr);
err_code= vio_getnameinfo(norm_addr, ip_string, ip_string_size, NULL, 0,
NI_NUMERICHOST);
if (!err_code)
return FALSE;
DBUG_PRINT("error", ("getnameinfo() failed with %d (%s).",
(int) err_code,
(const char *) gai_strerror(err_code)));
return TRUE;
}
/**
Return IP address and port of a VIO client socket.
The function returns an IPv4 address if IPv6 support is disabled.
The function returns an IPv4 address if the client socket is associated
with an IPv4-compatible or IPv4-mapped IPv6 address. Otherwise, the native
IPv6 address is returned.
*/
my_bool vio_peer_addr(Vio *vio, char *ip_buffer, uint16 *port,
size_t ip_buffer_size)
{
DBUG_ENTER("vio_peer_addr");
DBUG_PRINT("enter", ("Client socked fd: %d",
(int)mysql_socket_getfd(vio->mysql_socket)));
if (vio->localhost)
{
/*
Initialize vio->remote and vio->addLen. Set vio->remote to IPv4 loopback
address.
*/
struct in_addr *ip4= &((struct sockaddr_in *) &(vio->remote))->sin_addr;
vio->remote.ss_family= AF_INET;
ip4->s_addr= htonl(INADDR_LOOPBACK);
/* Initialize ip_buffer and port. */
strmov(ip_buffer, "127.0.0.1");
*port= 0;
}
else
{
int err_code;
char port_buffer[NI_MAXSERV];
struct sockaddr_storage addr_storage;
struct sockaddr *addr= (struct sockaddr *) &addr_storage;
size_socket addr_length= sizeof (addr_storage);
/* Get sockaddr by socked fd. */
err_code= mysql_socket_getpeername(vio->mysql_socket, addr, &addr_length);
if (err_code)
{
DBUG_PRINT("exit", ("getpeername() gave error: %d", socket_errno));
DBUG_RETURN(TRUE);
}
/* Normalize IP address. */
vio_get_normalized_ip(addr, addr_length,
(struct sockaddr *) &vio->remote);
/* Get IP address & port number. */
err_code= vio_getnameinfo((struct sockaddr *) &vio->remote,
ip_buffer, ip_buffer_size,
port_buffer, NI_MAXSERV,
NI_NUMERICHOST | NI_NUMERICSERV);
if (err_code)
{
DBUG_PRINT("exit", ("getnameinfo() gave error: %s",
gai_strerror(err_code)));
DBUG_RETURN(TRUE);
}
*port= (uint16) strtol(port_buffer, NULL, 10);
}
DBUG_PRINT("exit", ("Client IP address: %s; port: %d",
(const char *) ip_buffer,
(int) *port));
DBUG_RETURN(FALSE);
}
/**
Retrieve the amount of data that can be read from a socket.
@param vio A VIO object.
@param bytes[out] The amount of bytes available.
@retval FALSE Success.
@retval TRUE Failure.
*/
// WL#4896: Not covered
static my_bool socket_peek_read(Vio *vio, uint *bytes)
{
my_socket sd= mysql_socket_getfd(vio->mysql_socket);
#if defined(_WIN32)
u_long len;
if (ioctlsocket(sd, FIONREAD, &len))
return TRUE;
*bytes= len;
return FALSE;
#elif defined(FIONREAD_IN_SYS_IOCTL) || defined(FIONREAD_IN_SYS_FILIO)
int len;
if (ioctl(sd, FIONREAD, &len) < 0)
return TRUE;
*bytes= len;
return FALSE;
#else
char buf[1024];
ssize_t res= recv(sd, &buf, sizeof(buf), MSG_PEEK);
if (res < 0)
return TRUE;
*bytes= res;
return FALSE;
#endif /*_WIN32*/
}
#ifndef _WIN32
/**
Set of event flags grouped by operations.
*/
/*
Linux specific flag used to detect connection shutdown. The flag is
also used for half-closed notification, which here is interpreted as
if there is data available to be read from the socket.
*/
#ifndef POLLRDHUP
#define POLLRDHUP 0
#endif
/* Data may be read. */
#define MY_POLL_SET_IN (POLLIN | POLLPRI)
/* Data may be written. */
#define MY_POLL_SET_OUT (POLLOUT)
/* An error or hangup. */
#define MY_POLL_SET_ERR (POLLERR | POLLHUP | POLLNVAL)
#endif /* _WIN32 */
/**
Wait for an I/O event on a VIO socket.
@param vio VIO object representing a connected socket.
@param event The type of I/O event to wait for.
@param timeout Interval (in milliseconds) to wait for an I/O event.
A negative timeout value means an infinite timeout.
@remark socket_errno is set to SOCKET_ETIMEDOUT on timeout.
@return A three-state value which indicates the operation status.
@retval -1 Failure, socket_errno indicates the error.
@retval 0 The wait has timed out.
@retval 1 The requested I/O event has occurred.
*/
#ifndef _WIN32
int vio_io_wait(Vio *vio, enum enum_vio_io_event event, int timeout)
{
int ret;
short revents __attribute__((unused)) = 0;
struct pollfd pfd;
my_socket sd= mysql_socket_getfd(vio->mysql_socket);
MYSQL_SOCKET_WAIT_VARIABLES(locker, state) /* no ';' */
DBUG_ENTER("vio_io_wait");
DBUG_PRINT("enter", ("timeout: %d", timeout));
memset(&pfd, 0, sizeof(pfd));
pfd.fd= sd;
/*
Set the poll bitmask describing the type of events.
The error flags are only valid in the revents bitmask.
*/
switch (event)
{
case VIO_IO_EVENT_READ:
pfd.events= MY_POLL_SET_IN;
revents= MY_POLL_SET_IN | MY_POLL_SET_ERR | POLLRDHUP;
break;
case VIO_IO_EVENT_WRITE:
case VIO_IO_EVENT_CONNECT:
pfd.events= MY_POLL_SET_OUT;
revents= MY_POLL_SET_OUT | MY_POLL_SET_ERR;
break;
}
START_SOCKET_WAIT(locker, &state, vio->mysql_socket, PSI_SOCKET_SELECT, timeout);
/*
Wait for the I/O event and return early in case of
error or timeout.
*/
switch ((ret= poll(&pfd, 1, timeout)))
{
case -1:
DBUG_PRINT("error", ("poll returned -1"));
/* On error, -1 is returned. */
break;
case 0:
/*
Set errno to indicate a timeout error.
(This is not compiled in on WIN32.)
*/
DBUG_PRINT("info", ("poll timeout"));
errno= SOCKET_ETIMEDOUT;
break;
default:
/* Ensure that the requested I/O event has completed. */
DBUG_ASSERT(pfd.revents & revents);
break;
}
END_SOCKET_WAIT(locker, timeout);
DBUG_RETURN(ret);
}
#else
int vio_io_wait(Vio *vio, enum enum_vio_io_event event, int timeout)
{
int ret;
struct timeval tm;
my_socket fd= mysql_socket_getfd(vio->mysql_socket);
fd_set readfds, writefds, exceptfds;
MYSQL_SOCKET_WAIT_VARIABLES(locker, state) /* no ';' */
DBUG_ENTER("vio_io_wait");
/* Convert the timeout, in milliseconds, to seconds and microseconds. */
if (timeout >= 0)
{
tm.tv_sec= timeout / 1000;
tm.tv_usec= (timeout % 1000) * 1000;
}
FD_ZERO(&readfds);
FD_ZERO(&writefds);
FD_ZERO(&exceptfds);
/* Always receive notification of exceptions. */
FD_SET(fd, &exceptfds);
switch (event)
{
case VIO_IO_EVENT_READ:
/* Readiness for reading. */