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#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <errno.h>
#include <assert.h>
#include <sys/epoll.h>
#include "dmm_pub_api.h"
#include <pthread.h>
#include <fcntl.h>
#define MAX_EVENTS 512
int gepfd;
int fstack_listen_fd, kernel_listen_fd, i, kernel_accept_fd, fstack_accept_fd,
readlen;
char buffer[1024] = { 0 };
char fstack_html[] =
"HTTP/1.1 200 OK\r\n"
"Server: F-Stack\r\n"
"Date: Sat, 25 Feb 2017 09:26:33 GMT\r\n"
"Content-Type: text/html\r\n"
"Content-Length: 439\r\n"
"Last-Modified: Tue, 21 Feb 2017 09:44:03 GMT\r\n"
"Connection: keep-alive\r\n"
"Accept-Ranges: bytes\r\n"
"\r\n"
"<!DOCTYPE html>\r\n"
"<html>\r\n"
"<head>\r\n"
"<title>Welcome to F-Stack!</title>\r\n"
"<style>\r\n"
" body { \r\n"
" width: 35em;\r\n"
" margin: 0 auto; \r\n"
" font-family: Tahoma, Verdana, Arial, sans-serif;\r\n"
" }\r\n"
"</style>\r\n"
"</head>\r\n"
"<body>\r\n"
"<h1>Welcome to F-Stack!</h1>\r\n"
"\r\n"
"<p>For online documentation and support please refer to\r\n"
"<a href=\"http://F-Stack.org/\">F-Stack.org</a>.<br/>\r\n"
"\r\n"
"<p><em>Thank you for using F-Stack.</em></p>\r\n" "</body>\r\n" "</html>";
char kernel_html[] =
"HTTP/1.1 200 OK\r\n"
"Server: Kernel-Stack\r\n"
"Date: Sat, 25 Feb 2017 09:26:33 GMT\r\n"
"Content-Type: text/html\r\n"
"Content-Length: 439\r\n"
"Last-Modified: Tue, 21 Feb 2017 09:44:03 GMT\r\n"
"Connection: keep-alive\r\n"
"Accept-Ranges: bytes\r\n"
"\r\n"
"<!DOCTYPE html>\r\n"
"<html>\r\n"
"<head>\r\n"
"<title>You are using Kernel stack!</title>\r\n"
"<style>\r\n"
" body { \r\n"
" width: 35em;\r\n"
" margin: 0 auto; \r\n"
" font-family: Tahoma, Verdana, Arial, sans-serif;\r\n"
" }\r\n"
"</style>\r\n"
"</head>\r\n"
"<body>\r\n"
"<h1>You are using Kernel stack!</h1>\r\n"
"\r\n"
"<p>For online documentation and support please refer to\r\n"
"<a href=\"https://www.kernel.org/doc//\">kernel.org</a>.<br/>\r\n"
"\r\n"
"<p><em>Thank you for using kernel.</em></p>\r\n" "</body>\r\n" "</html>";
struct epoll_event ev;
struct epoll_event events[MAX_EVENTS];
static struct sockaddr_in g_k_ser;
static struct sockaddr_in g_f_ser;
static void
setArgsDefault ()
{
memset (&g_k_ser, 0, sizeof (g_k_ser));
g_k_ser.sin_family = AF_INET;
g_k_ser.sin_addr.s_addr = inet_addr ("127.0.0.1");
g_k_ser.sin_port = htons (80);
bzero (&(g_k_ser.sin_zero), 8);
memset (&g_f_ser, 0, sizeof (g_f_ser));
g_f_ser.sin_family = AF_INET;
g_f_ser.sin_addr.s_addr = inet_addr ("0.0.0.0");
g_f_ser.sin_port = htons (80);
bzero (&(g_f_ser.sin_zero), 8);
}
static int
process_arg (int argc, char *argv[])
{
int opt = 0;
const char *optstring = "f:k:";
if (argc < 2)
{
printf
("Param info :-f fstack server address; -k kernel server address; \n");
return 0;
}
while ((opt = getopt (argc, argv, optstring)) != -1)
{
switch (opt)
{
case 'f':
g_f_ser.sin_addr.s_addr = inet_addr (optarg);
break;
case 'k':
g_k_ser.sin_addr.s_addr = inet_addr (optarg);
break;
}
}
return 1;
}
void
clear_fd (int clearFd)
{
epoll_ctl (gepfd, EPOLL_CTL_DEL, clearFd, NULL);
close (clearFd);
if (clearFd == kernel_accept_fd)
{
kernel_accept_fd = 0;
}
else if (clearFd == fstack_accept_fd)
{
fstack_accept_fd = 0;
}
printf ("%d fd has been deleted from the epoll list\n\n\n", clearFd);
}
int
loop (void *arg)
{
/* Wait for events to happen */
(void) nstack_epoll_prewait ();
int nevents = epoll_wait (gepfd, events, MAX_EVENTS, 0);
for (i = 0; i < nevents; ++i)
{
/* Handle new connect */
if ((events[i].data.fd == fstack_listen_fd)
|| (events[i].data.fd == kernel_listen_fd))
{
while (1)
{
int acceptFd = accept (events[i].data.fd, NULL, NULL);
if (acceptFd < 0)
{
break;
}
if (events[i].data.fd == kernel_listen_fd)
{
kernel_accept_fd = acceptFd;
printf ("kernel listen fd = %d accept fd = %d\n",
kernel_listen_fd, kernel_accept_fd);
}
else
{
fstack_accept_fd = acceptFd;
printf ("f-stack listen fd = %d accept fd = %d\n",
kernel_listen_fd, fstack_accept_fd);
}
ev.data.fd = acceptFd;
ev.events = EPOLLIN;
/* Add to event list */
if (epoll_ctl (gepfd, EPOLL_CTL_ADD, acceptFd, &ev) != 0)
{
printf ("epoll_ctl failed:%d, %s\n", errno,
strerror (errno));
break;
}
}
}
else
{
if (events[i].events & EPOLLERR)
{
/* Simply close socket */
clear_fd (events[i].data.fd);
}
else if (events[i].events & EPOLLIN)
{
readlen = recv (events[i].data.fd, buffer, sizeof (buffer), 0);
printf ("read event on fd = %d readlen %d\n", events[i].data.fd,
readlen);
if (readlen > 0)
{
printf ("received below buffer from client\n %s\n", buffer);
if (events[i].data.fd == kernel_accept_fd)
{
if (strlen (kernel_html) !=
send (events[i].data.fd, kernel_html,
strlen (kernel_html), 0))
{
printf ("kernel send failed\n");
}
printf ("kernel send fd = %d\n", events[i].data.fd);
}
else
{
if (sizeof (fstack_html) !=
send (events[i].data.fd, fstack_html,
sizeof (fstack_html), 0))
{
printf ("fstack send failed\n");
}
printf ("fstack send fd = %d\n", events[i].data.fd);
}
}
else
{
clear_fd (events[i].data.fd);
}
}
else
{
printf ("unknown event: %8.8X\n", events[i].events);
}
}
}
}
void
main (int argc, char *argv[])
{
int on = 1, ret = 0;
setArgsDefault ();
ret = process_arg (argc, argv);
if (ret != 1)
{
printf ("The param error\n");
return;
}
// Creating socket file descriptor
if ((kernel_listen_fd = socket (AF_INET, SOCK_STREAM, 0)) == 0)
{
printf ("kernel socket failed\n");
exit (EXIT_FAILURE);
}
printf ("kernel socket success\n");
ioctl (kernel_listen_fd, FIONBIO, &on);
// Forcefully attaching socket to the port 8080
if (bind (kernel_listen_fd, (struct sockaddr *) &g_k_ser,
sizeof (g_k_ser)) < 0)
{
printf ("kernel bind failed\n");
exit (EXIT_FAILURE);
}
printf ("kernel bind success\n");
if (listen (kernel_listen_fd, 3) < 0)
{
printf ("kernel listen failed \n");
exit (EXIT_FAILURE);
}
printf ("kernel listen success \n");
assert ((gepfd = epoll_create (100)) > 0);
ev.data.fd = kernel_listen_fd;
ev.events = EPOLLIN;
epoll_ctl (gepfd, EPOLL_CTL_ADD, kernel_listen_fd, &ev);
/* fstack */
fstack_listen_fd = socket (AF_INET, SOCK_STREAM, 0);
printf ("sockfd:%d\n", fstack_listen_fd);
if (fstack_listen_fd < 0)
{
printf ("socket failed\n");
exit (1);
}
ioctl (fstack_listen_fd, FIONBIO, &on);
ret =
bind (fstack_listen_fd, (struct sockaddr *) &g_f_ser, sizeof (g_f_ser));
if (ret < 0)
{
printf ("bind failed\n");
exit (1);
}
ret = listen (fstack_listen_fd, MAX_EVENTS);
if (ret < 0)
{
printf ("listen failed\n");
exit (1);
}
ev.data.fd = fstack_listen_fd;
ev.events = EPOLLIN;
epoll_ctl (gepfd, EPOLL_CTL_ADD, fstack_listen_fd, &ev);
nstack_run ((void *) loop);
return;
}
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