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/* The server recieves connections and passes files to the clients
*/
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <signal.h>
#include <errno.h>
#include <sys/select.h>
#include <string.h>
#include <sds/sds.h>
#include <util.h>
#include <server-connection.h>
#include <server-cli.h>
int createCommunicationSocket(const char* ip, const char* port) {
int fd_socket = socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0);
herr(fd_socket, "socket");
int aton_status = 0;
struct sockaddr_in sa_socket = {
.sin_family = AF_INET,
.sin_port = atop(port),
.sin_addr = aton(ip, &aton_status),
};
herr(aton_status, "inet_aton");
// Reuse address when in TIME_WAIT state, after listening socket was closed
// https://stackoverflow.com/a/10651048/12036073
// https://superuser.com/questions/173535/what-are-close-wait-and-time-wait-states#comment951880_173543
int true = 1;
herr(setsockopt(fd_socket, SOL_SOCKET, SO_REUSEADDR, &true, sizeof(int)), "setsockopt");
herr(bind(fd_socket, (struct sockaddr*)&sa_socket, sizeof(struct sockaddr_in)), "bind");
herr(listen(fd_socket, 50), "listen");
return fd_socket;
}
void freeVhosts(sds **vhosts, int vhostsc) {
for (int i = 0; i < vhostsc; i++) {
sdsfreesplitres(vhosts[i], 3);
}
free(vhosts);
}
int acceptConnections = 1;
void handler_refuseConnections(int signum) {
acceptConnections = 0;
}
int main(int argc, char* argv[]) {
/*
* Get server parameters
*/
sds host = sdsnew("127.0.0.1");
sds port = sdsnew("8080");
int argvOffset = 1;
if (charCount(argv[1], ',') == 1) {
argvOffset++;
char* sep = strchr(argv[1], ',');
sdsfree(host);
host = sdsnewlen(argv[1], sep - argv[1]);
sdsfree(port);
port = sdsnew(sep + 1);
}
/*
* Get hosts
*/
int vhostsc = argc - argvOffset;
sds **vhosts = malloc(vhostsc * sizeof(sds*));
for (int i = 0, temp = 0; i < vhostsc; i++) {
vhosts[i] = sdssplitlen(argv[i+argvOffset], strlen(argv[i+argvOffset]), ",", 1, &temp);
}
/*
* Create socket for accepting connections
*/
int fd_socket = createCommunicationSocket(host, port);
printf("Listening on %s:%s\n", host, port);
/*
* Server command-line interface
*/
int pid_cli = fork();
if (pid_cli == 0) {
close(fd_socket);
handleCLI(vhosts, vhostsc);
freeVhosts(vhosts, vhostsc);
//while(wait(NULL) > 0);
return 0;
}
/*
* Define variables
*/
// Client address
struct sockaddr_in sa_client = {
.sin_family = AF_INET,
.sin_port = 0,
.sin_addr.s_addr = 0,
};
socklen_t sa_client_size = sizeof(struct sockaddr_in);
int fd_client;
int count = 0;
int pselectStat = 0;
/*
* Handle connection requests
*/
// Data for pselect
fd_set rfds;
struct timespec tv = {
/* How long should we block (wait) for fd_socket to have a request */
.tv_sec = 0,
.tv_nsec = 100000,
};
// Stop accepting connections on SIGTERM
signal(SIGTERM, handler_refuseConnections);
while (acceptConnections) {
/*
* Check if fd_socket has something we can read
*/
FD_ZERO(&rfds);
FD_SET(fd_socket, &rfds);
herrc(pselect(fd_socket + 1, &rfds, NULL, NULL, &tv, NULL), "pselect");
if (!FD_ISSET(fd_socket, &rfds)) continue;
/*
* Accept the connection
*/
fd_client = accept(fd_socket, (struct sockaddr*)&sa_client, &sa_client_size);
if (acceptConnections) herrc(fd_client, "accept");
if (fd_client < 0) continue;
char* strAddr = inet_ntoa(sa_client.sin_addr);
count++;
/*
* Logic when connected with client
*/
int fp = fork();
if (fp == 0) {
close(fd_socket);
on_connection(strAddr, fd_client, vhosts, argc - 1);
close(fd_client);
freeVhosts(vhosts, vhostsc);
return 0;
}
close(fd_client);
}
while(wait(NULL) > 0);
freeVhosts(vhosts, vhostsc);
close(fd_socket);
}
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