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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <ostp/net/auth.h>
#include <ostp/net/stpsession.h>
#include <arpa/inet.h>
#include <ostp/server.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#define MAX_BACKLOG 4
#define LISTEN_PORT 5352
static int
handle_client(struct sockaddr_in *caddr, struct ostp_client *c, struct ostp_listener *lp)
{
struct session_request srq;
ssize_t nread;
/* Try to read in the session request */
if ((nread = read(c->sockfd, &srq, sizeof(srq))) < 0) {
printf("Read failure...\n");
listener_close(lp, c);
return -1;
}
if (nread == 0) {
printf("Connection closed by peer\n");
listener_close(lp, c);
return -1;
}
/* Is this even a session request? */
if (nread != sizeof(srq)) {
printf("Rejecting data - not a session request...\n");
listener_close(lp, c);
return -1;
}
/* Handle the session request */
if (handle_srq(c, lp, &srq) < 0) {
listener_close(lp, c);
return -1;
}
return 0;
}
/*
* Put a listener in a known state during
* initialization.
*/
void
listener_init(struct ostp_listener *lp)
{
lp->port = LISTEN_PORT;
lp->on_recv = NULL;
}
int
listener_bind(struct ostp_listener *lp)
{
struct ostp_session *session;
struct sockaddr_in saddr;
int error;
lp->serv_sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (lp->serv_sockfd < 0) {
perror("Failed to create socket\n");
return -1;
}
saddr.sin_family = AF_INET;
saddr.sin_addr.s_addr = INADDR_ANY;
saddr.sin_port = htons(LISTEN_PORT);
error = bind(lp->serv_sockfd, (struct sockaddr *)&saddr, sizeof(saddr));
if (error < 0) {
perror("Failed to bind socket\n");
close(lp->serv_sockfd);
return error;
}
if ((error = listen(lp->serv_sockfd, MAX_BACKLOG)) < 0) {
perror("Failed to listen");
return error;
}
return 0;
}
int
listener_poll(struct ostp_listener *lp)
{
struct sockaddr_in caddr;
struct ostp_client *c;
socklen_t caddr_len;
pthread_t client_td;
int client_sock, error = 0;
char *ip;
memset(lp->clients, -1, sizeof(lp->clients));
lp->clients[0].sockfd = lp->serv_sockfd;
while (1) {
FD_ZERO(&lp->client_fds);
for (int i = 0; i < MAX_CLIENTS; ++i) {
if (lp->clients[i].sockfd >= 0)
FD_SET(lp->clients[i].sockfd, &lp->client_fds);
}
if (select(1024, &lp->client_fds, NULL, NULL, NULL) < 0) {
perror("select");
continue;
}
/* Check if the servers socket has new connections */
if (FD_ISSET(lp->serv_sockfd, &lp->client_fds)) {
caddr_len = sizeof(caddr);
client_sock = accept(lp->serv_sockfd, (struct sockaddr *)&caddr,
&caddr_len);
if (client_sock < 0) {
perror("accept");
continue;
}
for (int i = 0; i < MAX_CLIENTS; ++i) {
c = &lp->clients[i];
if (lp->client_count >= MAX_CLIENTS) {
printf("New connection rejected, max clients reached\n");
continue;
}
if (c->sockfd < 0) {
c->sockfd = client_sock;
ip = inet_ntoa(caddr.sin_addr);
printf("Incoming connection from %s\n", ip);
++lp->client_count;
handle_client(&caddr, c, lp);
break;
}
}
}
}
close(client_sock);
close(lp->serv_sockfd);
}
void
listener_cleanup(struct ostp_listener *lp)
{
struct ostp_client *c;
for (int i = 0; i < MAX_CLIENTS; ++i) {
c = &lp->clients[i];
listener_close(lp, c);
}
close(lp->serv_sockfd);
}
void
listener_close(struct ostp_listener *lp, struct ostp_client *c)
{
close(c->sockfd);
c->sockfd = -1;
memset(&c->session, 0, sizeof(c->session));
--lp->client_count;
}
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