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c3cb8df8a03705477dd8f31d20a7db161fe4951c
MaxScale/server/modules/protocol/plainclient.c
Markus Makela c3cb8df8a0 Renamed mongo protocol to plain protocol.
2015-03-31 15:13:10 +03:00

715 lines
20 KiB
C
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/*
* This file is distributed as part of the MariaDB Corporation MaxScale. It 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.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright MariaDB Corporation Ab 2013-2015
*/
/**
* @file mongo_client.c
*
* Revision History
* Date Who Description
*
*/
#include <skygw_utils.h>
#include <log_manager.h>
#include <gw.h>
#include <modinfo.h>
#include <sys/stat.h>
#include <modutil.h>
#include <plainprotocol.h>
MODULE_INFO info = {
MODULE_API_PROTOCOL,
MODULE_GA,
GWPROTOCOL_VERSION,
"The plain client protocol"
};
/** Defined in log_manager.cc */
extern int lm_enabled_logfiles_bitmask;
extern size_t log_ses_count[];
extern __thread log_info_t tls_log_info;
static char *version_str = "V1.0.0";
static int plain_accept(DCB *listener);
static int plain_listen(DCB *listener, char *config_bind);
static int plain_read(DCB* dcb);
static int plain_write_ready(DCB *dcb);
static int plain_write(DCB *dcb, GWBUF *queue);
static int plain_client_error(DCB *dcb);
static int plain_client_close(DCB *dcb);
static int plain_client_hangup_event(DCB *dcb);
/*
* The "module object" for the mysqld client protocol module.
*/
static GWPROTOCOL MyObject = {
plain_read, /* Read - EPOLLIN handler */
plain_write, /* Write - data from gateway */
plain_write_ready, /* WriteReady - EPOLLOUT handler */
plain_client_error, /* Error - EPOLLERR handler */
plain_client_hangup_event, /* HangUp - EPOLLHUP handler */
plain_accept, /* Accept */
NULL, /* Connect */
plain_client_close, /* Close */
plain_listen, /* Listen */
NULL, /* Authentication */
NULL /* Session */
};
/**
* Implementation of the mandatory version entry point
*
* @return version string of the module
*/
char *
version()
{
return version_str;
}
/**
* The module initialisation routine, called when the module
* is first loaded.
*/
void
ModuleInit()
{
}
/**
* The module entry point routine. It is this routine that
* must populate the structure that is referred to as the
* "module object", this is a structure with the set of
* external entry points for this module.
*
* @return The module object
*/
GWPROTOCOL *
GetModuleObject()
{
return &MyObject;
}
/**
* Write function for client DCB: writes data from MaxScale to Client
*
* @param dcb The DCB of the client
* @param queue Queue of buffers to write
*/
int
plain_write(DCB *dcb, GWBUF *queue)
{
return dcb_write(dcb, queue);
}
/**
* Client read event triggered by EPOLLIN
*
* @param dcb Descriptor control block
* @return 0 if succeed, 1 otherwise
*/
int plain_read(
DCB* dcb)
{
SESSION *session = NULL;
ROUTER_OBJECT *router = NULL;
ROUTER *router_instance = NULL;
void *rsession = NULL;
PlainProtocol *protocol = NULL;
GWBUF *read_buffer = NULL;
int rc = 0;
int nbytes_read = 0;
uint8_t cap = 0;
bool stmt_input = false; /*< router input type */
CHK_DCB(dcb);
protocol = DCB_PROTOCOL(dcb, PlainProtocol);
CHK_PROTOCOL(protocol);
rc = dcb_read(dcb, &read_buffer);
if (rc < 0)
{
dcb_close(dcb);
}
nbytes_read = gwbuf_length(read_buffer);
if (nbytes_read == 0)
{
goto return_rc;
}
if(dcb->session == NULL)
{
dcb->session = session_alloc(dcb->service,dcb);
}
rc = SESSION_ROUTE_QUERY(dcb->session, read_buffer);
return_rc:
return rc;
}
///////////////////////////////////////////////
// client write event to Client triggered by EPOLLOUT
//////////////////////////////////////////////
/**
* @node Client's fd became writable, and EPOLLOUT event
* arrived. As a consequence, client input buffer (writeq) is flushed.
*
* Parameters:
* @param dcb - in, use
* client dcb
*
* @return constantly 1
*
*
* @details (write detailed description here)
*
*/
int plain_write_ready(DCB *dcb)
{
PlainProtocol *protocol = NULL;
CHK_DCB(dcb);
ss_dassert(dcb->state != DCB_STATE_DISCONNECTED);
if (dcb == NULL) {
goto return_1;
}
if (dcb->state == DCB_STATE_DISCONNECTED) {
goto return_1;
}
if (dcb->protocol == NULL) {
goto return_1;
}
protocol = (PlainProtocol *)dcb->protocol;
dcb_drain_writeq(dcb);
goto return_1;
return_1:
return 1;
}
/**
* set listener for mysql protocol, retur 1 on success and 0 in failure
*/
int plain_listen(
DCB *listen_dcb,
char *config_bind)
{
int l_so;
int syseno = 0;
struct sockaddr_in serv_addr;
struct sockaddr_un local_addr;
struct sockaddr *current_addr;
int one = 1;
int rc;
if (strchr(config_bind, '/')) {
char *tmp = strrchr(config_bind, ':');
if (tmp)
*tmp = '\0';
// UNIX socket create
if ((l_so = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
fprintf(stderr,
"\n* Error: can't create UNIX socket due "
"error %i, %s.\n\n\t",
errno,
strerror(errno));
return 0;
}
memset(&local_addr, 0, sizeof(local_addr));
local_addr.sun_family = AF_UNIX;
strncpy(local_addr.sun_path, config_bind, sizeof(local_addr.sun_path) - 1);
current_addr = (struct sockaddr *) &local_addr;
} else {
/* MaxScale, as default, will bind on port 4406 */
if (!parse_bindconfig(config_bind, 4406, &serv_addr)) {
fprintf(stderr, "Error in parse_bindconfig for [%s]\n", config_bind);
return 0;
}
// TCP socket create
if ((l_so = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
fprintf(stderr,
"\n* Error: can't create socket due "
"error %i, %s.\n\n\t",
errno,
strerror(errno));
return 0;
}
current_addr = (struct sockaddr *) &serv_addr;
}
listen_dcb->fd = -1;
// socket options
if((syseno = setsockopt(l_so, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one))) != 0){
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,"Error: Failed to set socket options. Error %d: %s",errno,strerror(errno))));
}
// set NONBLOCKING mode
setnonblocking(l_so);
/* get the right socket family for bind */
switch (current_addr->sa_family) {
case AF_UNIX:
rc = unlink(config_bind);
if ( (rc == -1) && (errno!=ENOENT) ) {
fprintf(stderr, "Error unlink Unix Socket %s\n", config_bind);
}
if (bind(l_so, (struct sockaddr *) &local_addr, sizeof(local_addr)) < 0) {
fprintf(stderr,
"\n* Bind failed due error %i, %s.\n",
errno,
strerror(errno));
fprintf(stderr, "* Can't bind to %s\n\n", config_bind);
close(l_so);
return 0;
}
/* set permission for all users */
if (chmod(config_bind, 0777) < 0) {
fprintf(stderr,
"\n* chmod failed for %s due error %i, %s.\n\n",
config_bind,
errno,
strerror(errno));
}
break;
case AF_INET:
if (bind(l_so, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
fprintf(stderr,
"\n* Bind failed due error %i, %s.\n",
errno,
strerror(errno));
fprintf(stderr, "* Can't bind to %s\n\n", config_bind);
close(l_so);
return 0;
}
break;
default:
fprintf(stderr, "* Socket Family %i not supported\n", current_addr->sa_family);
close(l_so);
return 0;
}
rc = listen(l_so, 10 * SOMAXCONN);
if (rc == 0) {
LOGIF(LM, (skygw_log_write_flush(LOGFILE_MESSAGE,"Listening MySQL connections at %s", config_bind)));
} else {
int eno = errno;
errno = 0;
fprintf(stderr,
"\n* Failed to start listening MySQL due error %d, %s\n\n",
eno,
strerror(eno));
close(l_so);
return 0;
}
// assign l_so to dcb
listen_dcb->fd = l_so;
// add listening socket to poll structure
if (poll_add_dcb(listen_dcb) == -1) {
fprintf(stderr,
"\n* Failed to start polling the socket due error "
"%i, %s.\n\n",
errno,
strerror(errno));
return 0;
}
#if defined(FAKE_CODE)
conn_open[l_so] = true;
#endif /* FAKE_CODE */
listen_dcb->func.accept = plain_accept;
return 1;
}
/**
* @node (write brief function description here)
*
* Parameters:
* @param listener - <usage>
* <description>
*
* @return 0 in success, 1 in failure
*
*
* @details (write detailed description here)
*
*/
int plain_accept(DCB *listener)
{
int rc = 0;
DCB *client_dcb;
PlainProtocol *protocol;
int c_sock;
struct sockaddr client_conn;
socklen_t client_len = sizeof(struct sockaddr_storage);
int sendbuf = GW_BACKEND_SO_SNDBUF;
socklen_t optlen = sizeof(sendbuf);
int eno = 0;
int syseno = 0;
int i = 0;
CHK_DCB(listener);
while (1) {
retry_accept:
// new connection from client
c_sock = accept(listener->fd,
(struct sockaddr *) &client_conn,
&client_len);
eno = errno;
errno = 0;
if (c_sock == -1) {
if (eno == EAGAIN || eno == EWOULDBLOCK)
{
/**
* We have processed all incoming connections.
*/
rc = 1;
goto return_rc;
}
else if (eno == ENFILE || eno == EMFILE)
{
struct timespec ts1;
ts1.tv_sec = 0;
/**
* Exceeded system's (ENFILE) or processes
* (EMFILE) max. number of files limit.
*/
LOGIF(LD, (skygw_log_write(
LOGFILE_DEBUG,
"%lu [plain_accept] Error %d, %s. ",
pthread_self(),
eno,
strerror(eno))));
if (i == 0)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error %d, %s. "
"Failed to accept new client "
"connection.",
eno,
strerror(eno))));
}
i++;
ts1.tv_nsec = 100*i*i*1000000;
nanosleep(&ts1, NULL);
if (i<10) {
goto retry_accept;
}
rc = 1;
goto return_rc;
}
else
{
/**
* Other error.
*/
LOGIF(LD, (skygw_log_write(
LOGFILE_DEBUG,
"%lu [plain_accept] Error %d, %s.",
pthread_self(),
eno,
strerror(eno))));
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Failed to accept new client "
"connection due to %d, %s.",
eno,
strerror(eno))));
rc = 1;
goto return_rc;
} /* if (eno == ..) */
} /* if (c_sock == -1) */
/* reset counter */
i = 0;
listener->stats.n_accepts++;
#if defined(SS_DEBUG)
LOGIF(LD, (skygw_log_write_flush(
LOGFILE_DEBUG,
"%lu [plain_accept] Accepted fd %d.",
pthread_self(),
c_sock)));
#endif /* SS_DEBUG */
/* set nonblocking */
sendbuf = GW_CLIENT_SO_SNDBUF;
if((syseno = setsockopt(c_sock, SOL_SOCKET, SO_SNDBUF, &sendbuf, optlen)) != 0){
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,"Error: Failed to set socket options. Error %d: %s",errno,strerror(errno))));
}
sendbuf = GW_CLIENT_SO_RCVBUF;
if((syseno = setsockopt(c_sock, SOL_SOCKET, SO_RCVBUF, &sendbuf, optlen)) != 0){
LOGIF(LE, (skygw_log_write_flush(LOGFILE_ERROR,"Error: Failed to set socket options. Error %d: %s",errno,strerror(errno))));
}
setnonblocking(c_sock);
client_dcb = dcb_alloc(DCB_ROLE_REQUEST_HANDLER);
if (client_dcb == NULL) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Failed to create "
"DCB object for client connection.")));
close(c_sock);
rc = 1;
goto return_rc;
}
client_dcb->service = listener->session->service;
client_dcb->fd = c_sock;
// get client address
if ( client_conn.sa_family == AF_UNIX)
{
// client address
client_dcb->remote = strdup("localhost_from_socket");
// set localhost IP for user authentication
(client_dcb->ipv4).sin_addr.s_addr = 0x0100007F;
}
else
{
/* client IPv4 in raw data*/
memcpy(&client_dcb->ipv4,
(struct sockaddr_in *)&client_conn,
sizeof(struct sockaddr_in));
/* client IPv4 in string representation */
client_dcb->remote = (char *)calloc(INET_ADDRSTRLEN+1, sizeof(char));
if (client_dcb->remote != NULL)
{
inet_ntop(AF_INET,
&(client_dcb->ipv4).sin_addr,
client_dcb->remote,
INET_ADDRSTRLEN);
}
}
protocol = mysql_protocol_init(client_dcb, c_sock);
ss_dassert(protocol != NULL);
if (protocol == NULL) {
/** delete client_dcb */
dcb_close(client_dcb);
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [plain_accept] Failed to create "
"protocol object for client connection.",
pthread_self())));
rc = 1;
goto return_rc;
}
client_dcb->protocol = protocol;
// assign function poiters to "func" field
memcpy(&client_dcb->func, &MyObject, sizeof(GWPROTOCOL));
/**
* Set new descriptor to event set. At the same time,
* change state to DCB_STATE_POLLING so that
* thread which wakes up sees correct state.
*/
if (poll_add_dcb(client_dcb) == -1)
{
/* Send a custom error as MySQL command reply */
/** close client_dcb */
dcb_close(client_dcb);
/** Previous state is recovered in poll_add_dcb. */
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [plain_accept] Failed to add dcb %p for "
"fd %d to epoll set.",
pthread_self(),
client_dcb,
client_dcb->fd)));
rc = 1;
goto return_rc;
}
else
{
LOGIF(LD, (skygw_log_write(
LOGFILE_DEBUG,
"%lu [plain_accept] Added dcb %p for fd "
"%d to epoll set.",
pthread_self(),
client_dcb,
client_dcb->fd)));
}
} /**< while 1 */
#if defined(SS_DEBUG)
if (rc == 0) {
CHK_DCB(client_dcb);
CHK_PROTOCOL(((PlainProtocol *)client_dcb->protocol));
}
#endif
return_rc:
return rc;
}
static int plain_client_error(
DCB* dcb)
{
SESSION* session;
CHK_DCB(dcb);
session = dcb->session;
LOGIF(LD, (skygw_log_write(
LOGFILE_DEBUG,
"%lu [plain_client_error] Error event handling for DCB %p "
"in state %s, session %p.",
pthread_self(),
dcb,
STRDCBSTATE(dcb->state),
(session != NULL ? session : NULL))));
if (session != NULL && session->state == SESSION_STATE_STOPPING)
{
goto retblock;
}
dcb_close(dcb);
retblock:
return 1;
}
static int
plain_client_close(DCB *dcb)
{
SESSION* session;
ROUTER_OBJECT* router;
void* router_instance;
#if defined(SS_DEBUG)
PlainProtocol* protocol = (PlainProtocol *)dcb->protocol;
if (dcb->state == DCB_STATE_POLLING ||
dcb->state == DCB_STATE_NOPOLLING ||
dcb->state == DCB_STATE_ZOMBIE)
{
if (!DCB_IS_CLONE(dcb)) CHK_PROTOCOL(protocol);
}
#endif
LOGIF(LD, (skygw_log_write(LOGFILE_DEBUG,
"%lu [plain_client_close]",
pthread_self())));
mysql_protocol_done(dcb);
session = dcb->session;
/**
* session may be NULL if session_alloc failed.
* In that case, router session wasn't created.
*/
if (session != NULL)
{
CHK_SESSION(session);
spinlock_acquire(&session->ses_lock);
if (session->state != SESSION_STATE_STOPPING)
{
session->state = SESSION_STATE_STOPPING;
}
router_instance = session->service->router_instance;
router = session->service->router;
/**
* If router session is being created concurrently router
* session might be NULL and it shouldn't be closed.
*/
if (session->router_session != NULL)
{
spinlock_release(&session->ses_lock);
/** Close router session and all its connections */
router->closeSession(router_instance, session->router_session);
}
else
{
spinlock_release(&session->ses_lock);
}
}
return 1;
}
/**
* Handle a hangup event on the client side descriptor.
*
* We simply close the DCB, this will propogate the closure to any
* backend descriptors and perform the session cleanup.
*
* @param dcb The DCB of the connection
*/
static int
plain_client_hangup_event(DCB *dcb)
{
SESSION* session;
CHK_DCB(dcb);
session = dcb->session;
if (session != NULL && session->state == SESSION_STATE_ROUTER_READY)
{
CHK_SESSION(session);
}
if (session != NULL && session->state == SESSION_STATE_STOPPING)
{
goto retblock;
}
dcb_close(dcb);
retblock:
return 1;
}
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