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wip put poll version inside luke version

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This commit is contained in:
hugogogo
2022-07-20 17:11:24 +02:00
parent fecf5411bc
commit 708da8bb61
6 changed files with 523 additions and 334 deletions
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12
README.md
View File

@@ -81,12 +81,15 @@
```
functions action in this scenario :
______
sd = SOCKET() : create a listening socket descriptor
__________
SETSOCKOPT(sd) : allow socket descriptor to be reuseable
_____
IOCTL(sd) : set listening socket and all incoming socket to be non-blocking
_____
FCNTL(sd) : set listening socket and all incoming socket to be non-blocking
____
BIND(port) : associate listening socket to a port
______
@@ -138,6 +141,7 @@ compare architectures :
. | . loop through fds[] | . loop i++ < max_fd
. | . . | . .
. | . . POLLIN && lstn_sd ? | . . FD_ISSET(i) & lstn_fd ?
. | . . loop | . . loop
. ______ | . . . ______ | . . . ______
. ACCEPT() | . . . new_sd = ACCEPT() | . . . new_sd = ACCEPT()
. | . . . | . . .
@@ -145,7 +149,8 @@ compare architectures :
. | . . | . . .
. | . . | . . . max_sd = new_sd
. | . . | . .
. | . . POLLIN ? | . . FD_ISSET ?
. | . . or POLLIN ? | . . or FD_ISSET ?
. | . . loop | . . loop
. ____ | . . . ____ | . . . ____
. RECV() | . . . RECV() | . . . RECV()
. ____ | . . . ____ | . . . ____
@@ -156,5 +161,10 @@ compare architectures :
. CLOSE(fds[]) | . CLOSE(fds[]) | . CLOSE(fds[])
first, create the socket, add some options, bind it, and listen to it.
then, do a loop starting with POLL or SELECT
if it's incomming connexions, accept and add them all to the list
if it's accepted connexions, read their datas and write new datas
```

251
srcs/Webserv.cpp
View File

@@ -3,30 +3,41 @@
Webserv::Webserv()
{
int on = 1;
std::cout << "Server init\n";
// _socket_fd = ::socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0);
_socket_fd = ::socket(AF_INET, SOCK_STREAM, 0);
//_socket_fd = ::socket(AF_INET, SOCK_STREAM, 0);
_socket_fd = ::socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0);
if (_socket_fd == -1)
{
::perror("err socket(): ");
::perror("err socket()");
throw std::runtime_error("Socket init");
}
// allow socket descriptor to be reuseable
if (setsockopt(_socket_fd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0)
{
::perror("setsockopt() failed");
throw std::runtime_error("Socket init");
}
}
/* Webserv::Webserv(Webserv const &src)
{
} */
//Webserv::Webserv(Webserv const &src)
//{
//
//}
Webserv::~Webserv()
{
std::cout << "Server destroyed\n";
}
/* Webserv & Webserv::operator=(Webserv const &rhs)
{
} */
//Webserv & Webserv::operator=(Webserv const &rhs)
//{
//
//}
///////////////
@@ -34,13 +45,10 @@ Webserv::~Webserv()
void Webserv::bind(in_port_t port)
{
// cast invalid ? how to ?
// const struct sockaddr* cast_test = static_cast<const struct sockaddr*>(addr);
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = ::htons(port);
addr.sin_addr.s_addr = ::htonl(INADDR_ANY); // htonl useless with 0 value (INADDR_ANY)
addr.sin_addr.s_addr = ::htonl(INADDR_ANY);
if (::bind(_socket_fd, (const sockaddr*)&addr, sizeof addr) == -1)
{
@@ -61,9 +69,214 @@ void Webserv::listen(unsigned int max_connections)
#define BUFSIZE 8192
#define MSG_TEST "Le Webserv / 20 =D\n"
#define MSG_BOUNCE "bounced properly ;)\n" // placeholder
#define TRUE 1
#define FALSE 0
void Webserv::start()
{
int len, rc;
int listen_sd = -1, new_sd = -1;
int end_server = FALSE, compress_array = FALSE;
int close_conn;
char buffer[80];
// struct sockaddr_in addr;
struct pollfd fds[200];
int nfds = 1, current_size = 0, i, j;
memset(fds, 0 , sizeof(fds));
fds[0].fd = listen_sd;
fds[0].events = POLLIN;
std::cout << "Server started\n";
while (end_server == FALSE)
{
// ***********************************************************
// * Call poll() *
// ***********************************************************
poll(fds, nfds, -1);
// ***********************************************************
// * One or more descriptors are readable. Need to *
// * determine which ones they are. *
// ***********************************************************
current_size = nfds;
for (i = 0; i < current_size; i++)
{
// *********************************************************
// * Loop through to find the descriptors that returned *
// * POLLIN and determine whether it's the listening *
// * or the active connection. *
// *********************************************************
if(fds[i].revents == 0)
continue;
// *********************************************************
// * If revents is not POLLIN, it's an unexpected result, *
// * log and end the server. *
// *********************************************************
if(fds[i].revents != POLLIN)
{
printf(" Error! revents = %d\n", fds[i].revents);
end_server = TRUE;
break;
}
if (fds[i].fd == listen_sd)
{
// *******************************************************
// * Listening descriptor is readable. *
// *******************************************************
printf(" Listening socket is readable\n");
// *******************************************************
// * Accept all incoming connections that are *
// * queued up on the listening socket before we *
// * loop back and call poll again. *
// *******************************************************
do
{
// *****************************************************
// * Accept each incoming connection. If *
// * accept fails with EWOULDBLOCK, then we *
// * have accepted all of them. Any other *
// * failure on accept will cause us to end the *
// * server. *
// *****************************************************
new_sd = accept(listen_sd, NULL, NULL);
if (new_sd < 0)
{
if (errno != EWOULDBLOCK)
{
perror(" accept() failed");
end_server = TRUE;
}
break;
}
// *****************************************************
// * Add the new incoming connection to the *
// * pollfd structure *
// *****************************************************
printf(" New incoming connection - %d\n", new_sd);
fds[nfds].fd = new_sd;
fds[nfds].events = POLLIN;
nfds++;
// *****************************************************
// * Loop back up and accept another incoming *
// * connection *
// *****************************************************
} while (new_sd != -1);
}
// *********************************************************
// * This is not the listening socket, therefore an *
// * existing connection must be readable *
// *********************************************************
else
{
printf(" Descriptor %d is readable\n", fds[i].fd);
close_conn = FALSE;
// *******************************************************
// * Receive all incoming data on this socket *
// * before we loop back and call poll again. *
// *******************************************************
do
{
// *****************************************************
// * Receive data on this connection until the *
// * recv fails with EWOULDBLOCK. If any other *
// * failure occurs, we will close the *
// * connection. *
// *****************************************************
rc = recv(fds[i].fd, buffer, sizeof(buffer), 0);
if (rc < 0)
{
if (errno != EWOULDBLOCK)
{
perror(" recv() failed");
close_conn = TRUE;
}
break;
}
// *****************************************************
// * Check to see if the connection has been *
// * closed by the client *
// *****************************************************
if (rc == 0)
{
printf(" Connection closed\n");
close_conn = TRUE;
break;
}
// *****************************************************
// * Data was received *
// *****************************************************
len = rc;
printf(" %d bytes received\n", len);
// *****************************************************
// * Echo the data back to the client *
// *****************************************************
rc = send(fds[i].fd, buffer, len, 0);
if (rc < 0)
{
perror(" send() failed");
close_conn = TRUE;
break;
}
} while(TRUE);
// *******************************************************
// * If the close_conn flag was turned on, we need *
// * to clean up this active connection. This *
// * clean up process includes removing the *
// * descriptor. *
// *******************************************************
if (close_conn)
{
close(fds[i].fd);
fds[i].fd = -1;
compress_array = TRUE;
}
} // End of existing connection is readable
} // End of loop through pollable descriptors
// ***********************************************************
// * If the compress_array flag was turned on, we need *
// * to squeeze together the array and decrement the number *
// * of file descriptors. We do not need to move back the *
// * events and revents fields because the events will always*
// * be POLLIN in this case, and revents is output. *
// ***********************************************************
if (compress_array)
{
compress_array = FALSE;
for (i = 0; i < nfds; i++)
{
if (fds[i].fd == -1)
{
for(j = i; j < nfds; j++)
{
fds[j].fd = fds[j+1].fd;
}
i--;
nfds--;
}
}
}
}
/*
struct sockaddr_in addr;
socklen_t addr_len;
int accepted_fd;
@@ -71,9 +284,6 @@ void Webserv::start()
char buf[BUFSIZE]; // WIP buffer. need to try with std::vector or std::string.
int ret;
std::cout << "Server started\n";
while (1)
{
std::cout << "----------\n";
std::cout << "accept()\n";
addr_len = sizeof addr;
@@ -102,10 +312,6 @@ void Webserv::start()
::close(accepted_fd);
continue;
}
/*
if (ret == BUFSIZE)
// send error like "request too long" to client
*/
buf[ret] = '\0';
std::cout << "send()\n";
@@ -115,5 +321,6 @@ void Webserv::start()
::perror("err send(): ");
::close(accepted_fd);
*/
}
}

15
srcs/Webserv.hpp
View File

@@ -4,8 +4,6 @@
# include <string>
# include <map>
# include <cerrno> // errno
# include <cstdio> // perror
# include <exception>
# include <stdexcept>
# include <unistd.h> // close
@@ -19,6 +17,19 @@
# include <poll.h> // poll
# include <fcntl.h> // fcntl
# include <unistd.h> // close
# include <stdlib.h> // exit
# include <iostream> // cout, cin
# include <cerrno> // errno
# include <cstdio> // perror
# include <string.h> // memset
# include <sys/socket.h> // socket, accept, listen, send, recv, bind, connect, setsockopt, getsockname
# include <netinet/in.h> // sockaddr_in
# include <arpa/inet.h> // inet_ntoa, inet_addr, htonl, htons, ntohl, ntohs
# include <poll.h> // poll
# include <fcntl.h> // fcntl
# include <sys/ioctl.h> // ioctl
class Webserv
{
public:

44
srcs/main.cpp
View File

@@ -12,7 +12,7 @@ int main(void)
// https://security.stackexchange.com/questions/169213/how-to-chose-a-port-to-run-an-application-on-localhost
serv.bind(4040);
serv.listen(512); // 512 max connections arbitrary
serv.listen(20);
serv.start();
}
catch (std::exception& e)
@@ -22,45 +22,3 @@ int main(void)
return (0);
}
/*
______
listen_fd = SOCKET() : create a listening socket
__________
SETSOCKOPT() : Allow socket descriptor to be reuseable
_____
IOCTL() : set listen_fd and all incoming socket to be non-blocking
____
BIND(port) : associate listen_fd to a port
______
LISTEN(nb_queue) : queue the incoming connections to listen_fd, up to a chosen number
fds[1] = listen_fd
loop
. ____
. POLL(fds[]) :
.
. loop through fds[]
. .
. . POLLIN && listen_fd ? : readable socket and this is the listening one
. . . ______
. . . new_fd = ACCEPT() : extract first connection request in queue of listen_fd
. . . and creates a new socket that is connected
. . .
. . . fds[] += new_fd
. .
. . POLLIN ? : readable socket and this is an active one
. . . ____
. . . RECV() : read data in socket created by accept()
. . . ____
. . . SEND() : write data in socket created by accept()
loop through fds[] :
. _____
. CLOSE(fds[])
*/

15
srcs/main_select.cpp
View File

@@ -1,4 +1,6 @@
// https://www.ibm.com/docs/en/i/7.2?topic=designs-example-nonblocking-io-select
# include <unistd.h> // close
# include <string.h>
# include <stdio.h>
@@ -16,7 +18,8 @@
int main ()
{
int i, len, rc, on = 1;
int i, len, rc;
int on = 1;
int listen_sd, max_sd, new_sd;
int desc_ready, end_server = FALSE;
int close_conn;
@@ -30,6 +33,7 @@ int main ()
/* connections on */
/*************************************************************/
listen_sd = socket(AF_INET6, SOCK_STREAM, 0);
// listen_sd = socket(AF_INET6, SOCK_STREAM | SOCK_NONBLOCK, 0);
if (listen_sd < 0)
{
perror("socket() failed");
@@ -39,8 +43,7 @@ int main ()
/*************************************************************/
/* Allow socket descriptor to be reuseable */
/*************************************************************/
rc = setsockopt(listen_sd, SOL_SOCKET, SO_REUSEADDR,
(char *)&on, sizeof(on));
rc = setsockopt(listen_sd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on));
if (rc < 0)
{
perror("setsockopt() failed");
@@ -116,7 +119,7 @@ int main ()
/**********************************************************/
/* Call select() and wait 3 minutes for it to complete. */
/**********************************************************/
printf("Waiting on select()...\n");
printf("\nWaiting on select()...\n");
rc = select(max_sd + 1, &working_set, NULL, NULL, &timeout);
/**********************************************************/
@@ -163,7 +166,7 @@ int main ()
/****************************************************/
if (i == listen_sd)
{
printf(" Listening socket is readable\n");
printf("\n Listening socket is readable\n");
/*************************************************/
/* Accept all incoming connections that are */
/* queued up on the listening socket before we */
@@ -211,7 +214,7 @@ int main ()
/****************************************************/
else
{
printf(" Descriptor %d is readable\n", i);
printf("\n Descriptor %d is readable\n", i);
close_conn = FALSE;
/*************************************************/
/* Receive all incoming data on this socket */

BIN
webserv
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