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/* The server recieves connections and passes files to the clients
*/
#include <server-connection.h>
#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>
#define MAX_LEN_COMMAND 16
#define COMMAND_FORMAT ": %16s"
void freeVhosts(sds **vhosts, int argc) {
for (int i = 1; i < argc; i++) {
sdsfreesplitres(vhosts[i-1], 3);
}
free(vhosts);
}
int streq(const char* first, const char* second) {
return strcmp(first, second) == 0;
}
int acceptConnections = 1;
void handler_refuseConnections(int signum) {
acceptConnections = 0;
}
int main(int argc, char* argv[]) {
/*
* Get hosts
*/
sds **vhosts = malloc((argc - 1) * sizeof(sds*));
for (int i = 1, temp = 0; i < argc; i++) {
vhosts[i-1] = sdssplitlen(argv[i], strlen(argv[i]), ",", 1, &temp);
}
/*
* Create socket for accepting connections
*/
int fd_socket;
herr(fd_socket = socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0), "socket");
struct sockaddr_in sa_socket = {
.sin_family = AF_INET,
.sin_port = inet_atop("8080"),
};
herr(inet_aton("127.0.0.1", &sa_socket.sin_addr.s_addr), "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");
printf("Listening on %s:%s\n", "127.0.0.1", "8080");
/*
* Accept connection on the socket
*/
int pid_connections = fork();
if (pid_connections == 0) {
// 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);
// Data for pselect
fd_set rfds;
struct timespec tv = {
.tv_sec = 0,
.tv_nsec = 100000,
};
int fd_client;
int count = 0;
int pselectStat = 0;
// Effecitvely stops the cycle 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;
/* If so, accept the connection and pass execution to the "main" logic */
fd_client = accept(fd_socket, (struct sockaddr*)&sa_client, &sa_client_size);
herrc(fd_client, "accept");
if (fd_client < 0) continue;
char* strAddr = inet_ntoa(sa_client.sin_addr);
count++;
int fp = fork();
if (fp == 0) {
close(fd_socket);
on_connection(strAddr, fd_client, vhosts, argc - 1);
close(fd_client);
freeVhosts(vhosts, argc);
return 0;
}
close(fd_client);
}
while(wait(NULL) > 0);
freeVhosts(vhosts, argc);
close(fd_socket);
return 0;
}
/*
* Server command-line interface
*/
close(fd_socket);
// Get a line
char line[256];
fgets(line, 256, stdin);
// Get command name and it's arguments
// Currently no command takes arguments
char name[MAX_LEN_COMMAND+1];
int argsAssigned = sscanf(line, COMMAND_FORMAT, name);
while (name[0] != 'q' && name[0] != 'e' && !streq(name, "quit") && !streq(name, "exit")) {
if (argsAssigned < 1) {
printf("Bad command syntax!\n");
}
else if (streq(name, "vhosts")) {
for (int i = 1; i < argc; i++) {
printf("Name: \"%s\" Root dir: \"%s\" Error file: \"%s\"\n",
vhosts[i-1][vh_user],
vhosts[i-1][vh_path],
vhosts[i-1][vh_error]);
}
}
else if (streq(name, "help")) {
printf("help\tPrints this message\nvhosts\tPrints all registered virtual hosts\n");
}
else {
printf("Unknown command %s!\n", name);
}
// Get line and divided it into command name and arguments
fgets(line, 256, stdin);
argsAssigned = sscanf(line, COMMAND_FORMAT, name);
}
/*
* Upon termination
*/
printf("Exiting...\n");
kill(pid_connections, SIGTERM);
while(wait(NULL) > 0);
freeVhosts(vhosts, argc);
}
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