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/*
qotdserver
Copyright (C) 2019 Richard Knight
This program 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, either version 3 of the License, or
(at your option) any later version.
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, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <pthread.h>
#include <signal.h>
#include <errno.h>
#include "qotdserver.h"
#include "logger.h"
const char *port = "17";
struct workerArgs
{
int socket;
};
void *accept_clients(void *args);
void *service_single_client(void *args);
int serve()
{
pthread_t server_thread;
sigset_t new;
sigemptyset (&new);
sigaddset(&new, SIGPIPE);
if (pthread_sigmask(SIG_BLOCK, &new, NULL) != 0)
{
write_log("Unable to mask SIGPIPE");
raise(SIGTERM);
}
if (pthread_create(&server_thread, NULL, accept_clients, NULL) < 0)
{
write_log("Could not create server thread");
raise(SIGTERM);
}
pthread_join(server_thread, NULL);
pthread_exit(NULL);
}
void *accept_clients(void *args)
{
int serverSocket;
int clientSocket;
pthread_t worker_thread;
struct addrinfo hints, *res, *p;
struct sockaddr_storage *clientAddr;
socklen_t sinSize = sizeof(struct sockaddr_storage);
struct workerArgs *wa;
int yes = 1;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
if (getaddrinfo(NULL, port, &hints, &res) != 0)
{
write_log("getaddrinfo() failed");
pthread_exit(NULL);
}
for(p = res;p != NULL; p = p->ai_next)
{
if ((serverSocket = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1)
{
write_log("Could not open socket");
continue;
}
if (setsockopt(serverSocket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1)
{
write_log("Socket setsockopt() failed");
close(serverSocket);
continue;
}
if (bind(serverSocket, p->ai_addr, p->ai_addrlen) == -1)
{
write_log("Socket bind() failed");
close(serverSocket);
continue;
}
if (listen(serverSocket, 5) == -1)
{
write_log("Socket listen() failed");
close(serverSocket);
continue;
}
break;
}
freeaddrinfo(res);
if (p == NULL)
{
write_log("Could not find a socket to bind to");
pthread_exit(NULL);
}
/* Loop and wait for connections */
while (1)
{
clientAddr = malloc(sinSize);
if ((clientSocket = accept(serverSocket, (struct sockaddr *) clientAddr, &sinSize)) == -1)
{
free(clientAddr);
write_log("Could not accept() connection");
continue;
}
wa = malloc(sizeof(struct workerArgs));
wa->socket = clientSocket;
if (pthread_create(&worker_thread, NULL, service_single_client, wa) != 0)
{
write_log("Could not create a worker thread");
free(clientAddr);
free(wa);
close(clientSocket);
close(serverSocket);
pthread_exit(NULL);
}
}
pthread_exit(NULL);
}
void *service_single_client(void *args) {
struct workerArgs *wa;
int socket, nbytes;
wa = (struct workerArgs*) args;
socket = wa->socket;
pthread_detach(pthread_self());
// log connection
struct sockaddr_in addr;
socklen_t addr_size = sizeof(struct sockaddr_in);
int res = getpeername(socket, (struct sockaddr *)&addr, &addr_size);
char log_string[20 + INET_ADDRSTRLEN] = "Connection from ";
strcat(log_string, inet_ntoa(addr.sin_addr));
// send
char *tosend = get_quote(&config);
nbytes = send(socket, tosend, strlen(tosend), 0);
close(socket);
free(wa);
// write log
write_log(log_string);
pthread_exit(NULL);
}
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