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Addition of the service, server, serv_protocol and session structure needed to tie the elements together.

Browse Source 
Improvements to the protocol module support

Documentation improvements

Addition of make install target
This commit is contained in:
Mark Riddoch
2013-06-18 16:59:01 +02:00
parent 4d5215e267
commit ec688e6222
26 changed files with 1255 additions and 93 deletions
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139
modules/protocol/telnetd.c
View File

@ -18,9 +18,26 @@
#include <stdio.h>
#include <dcb.h>
#include <buffer.h>
#include <service.h>
#include <session.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
/**
* @file telnetd - telnet daemon protocol module
* @file telnetd.c - telnet daemon protocol module
*
* The telnetd protocol module is intended as a mechanism to allow connections
* into the gateway for the purpsoe of accessing debugging information within
* the gateway rather than a protocol to be used to send queries to backend
* databases.
*
* In the first instance it is intended to allow a debug connection to access
* internal data structures, however it may also be used to manage the
* configuration of the gateway.
*
* @verbatim
* Revision History
@ -39,6 +56,7 @@ static int telnetd_error(DCB *dcb, int event);
static int telnetd_hangup(DCB *dcb, int event);
static int telnetd_accept(DCB *dcb, int event);
static int telnetd_close(DCB *dcb, int event);
static int telnetd_listen(DCB *dcb, int event);
/**
* The "module object" for the telnetd protocol module.
@ -51,7 +69,8 @@ static GWPROTOCOL MyObject = {
telnetd_hangup, /**< HangUp - EPOLLHUP handler */
telnetd_accept, /**< Accept */
NULL, /**< Connect */
telnetd_close /**< Close */
telnetd_close, /**< Close */
telnetd_listen /**< Create a listener */
};
/**
@ -72,7 +91,7 @@ version()
void
ModuleInit()
{
fprintf(stderr, "Initialise Telnetd Protcol module.\n");
fprintf(stderr, "Initialise Telnetd Protocol module.\n");
}
/**
@ -99,6 +118,19 @@ GetModuleObject()
static int
telnetd_read_event(DCB* dcb, int epfd)
{
int n;
GWBUF *head = NULL;
SESSION *session = dcb->session;
ROUTER_OBJECT *router = session->service->router;
ROUTER *router_instanc = session->service->router_instance;
void *rsession = session->router_session;
if ((n = dcb_read(dcb, &head)) != -1)
{
router->routeQuery(router_instance, rsession, head);
}
return n;
}
/**
@ -111,6 +143,7 @@ telnetd_read_event(DCB* dcb, int epfd)
static int
telnetd_write_event(DCB *dcb, int epfd)
{
int dcb_drain_writeq(dcb);
}
/**
@ -125,13 +158,14 @@ telnetd_write_event(DCB *dcb, int epfd)
static int
telnetd_write(DCB *dcb, GWBUF *queue)
{
return dcb_write(dcb, queue);
}
/**
* Handler for the EPOLLERR event.
*
* @param dcb The descriptor control block
* @param epfd The epoll descriptor
* @param event The epoll descriptor
*/
static int
telnetd_error(DCB *dcb, int event)
@ -142,7 +176,7 @@ telnetd_error(DCB *dcb, int event)
* Handler for the EPOLLHUP event.
*
* @param dcb The descriptor control block
* @param epfd The epoll descriptor
* @param event The epoll descriptor
*/
static int
telnetd_hangup(DCB *dcb, int event)
@ -154,11 +188,45 @@ telnetd_hangup(DCB *dcb, int event)
* socket for the protocol.
*
* @param dcb The descriptor control block
* @param epfd The epoll descriptor
* @param event The epoll descriptor
*/
static int
telnetd_accept(DCB *dcb, int event)
{
int n_connect = 0;
while (1)
{
int so;
struct sockaddr_in addr;
socklen_t addrlen;
DCB *client;
struct epoll_event ee;
if ((so = accept(dcb->fd, (struct sockaddr *)&addr, &addrlen)) == -1)
return n_connect;
else
{
atomic_add(&dcb->stats.n_accepts, 1);
client = alloc_dcb();
client->fd = so;
memcpy(&client->func, MyObject, sizeof(GWPROTOCOL));
client->session = session_alloc(listener->service, client);
ee.events = EPOLLIN | EPOLLOUT | EPOLLET;
ee.data.ptr = client;
client->state = DCB_STATE_IDLE;
if (epoll_ctl(efd, EPOLL_CTL_ADD, c_sock, &ee) == -1)
{
return n_connect;
}
n_connect++;
dcb_printf(client, "Gateway> ");
}
}
return n_connect;
}
/**
@ -166,7 +234,7 @@ telnetd_accept(DCB *dcb, int event)
* explicitly close a connection.
*
* @param dcb The descriptor control block
* @param epfd The epoll descriptor
* @param event The epoll descriptor
*/
static int
@ -174,4 +242,61 @@ telnetd_close(DCB *dcb, int event)
{
}
/**
* Telnet daemon listener entry point
*
* @param efd epoll File descriptor
* @param config Configuration (ip:port)
*/
static int
telnetd_listen(int efd, char *config)
{
DCB *listener;
struct sockaddr_in addr;
char *port;
struct epoll_event ev;
int one;
if ((listener = dcb_alloc()) == NULL)
{
return 0;
}
memcpy(&listener->func, MyObject, sizeof(GWPROTOCOL));
port = strrchr(config, ':');
if (port)
port++;
else
port = "4442";
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = htons(port);
if ((listener->fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
return 0;
}
// socket options
setsockopt(listener->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
// set NONBLOCKING mode
setnonblocking(listener->fd);
bind address and port
if (bind(listener->fd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
{
return 0;
}
listener->state = DCB_STATE_LISTENING;
listen(listener->fd, SOMAXCONN);
ev.events = EPOLLIN;
ev.data.ptr = listener;
if (epoll_ctl(epfd, EPOLL_CTL_ADD, l_so, &ev) == -1)
{
return 0;
}
return 1;
}