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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 <string.h>
#include <sds/sds.h>
#include <util.h>
#define username 0
#define path_root 1
#define path_error 2
sds constructFilePath(const sds root, const char* file) {
sds path = sdsdup(root);
if (root[sdslen(root)-1] != '/' && file[0] != '/')
path = sdscat(path, "/");
path = sdscat(path, file);
if (file[strlen(file)-1] == '/')
path = sdscat(path, "index.md");
return path;
}
void on_connection(const char* client, const int fd_client, sds **vhosts, const int vhostsc) {
printf("[%s@%d] Connected successfully!\n", client, fd_client);
/* Get address request */
char address[256];
read(fd_client, address, 256);
printf("[%s@%d] Requested %s\n", client, fd_client, address);
/* Does vhosts contain an address with the username? */
int usernameLen = strchr(address, '@') - address;
const sds *vhost = NULL;
for (int i = 0; i < vhostsc; i++) {
if (strncmp(vhosts[i][username], address, usernameLen) == 0) {
vhost = *vhosts + i;
break;
}
}
if (vhost == NULL) {
fprintf(stderr, "[%s@%d] Unknown username in address %s\n", client, fd_client, address);
return;
}
/* Try to open the requested file or the error file */
sds filePath = constructFilePath(vhost[path_root], address + usernameLen + 1);
int fd = open(filePath, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "[%s@%d] Error opening %s\n", client, fd_client, filePath);
sdsfree(filePath);
filePath = constructFilePath(vhost[path_root], vhost[path_error]);
fd = open(filePath, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "[%s@%d] Error opening %s\n", client, fd_client, filePath);
sdsfree(filePath);
return;
}
}
/* Send the file to the client */
printf("[%s@%d] Serving %s\n", client, fd_client, filePath);
sdsfree(filePath);
char buff[256];
memset(buff, 0, sizeof(buff));
while (read(fd, buff, 256)) {
write(fd_client, buff, strlen(buff));
memset(buff, 0, sizeof(buff));
}
/* Finalize */
close(fd);
printf("[%s@%d] Served!\n", client, fd_client);
}
void freeVhosts(sds **vhosts, int argc) {
for (int i = 1; i < argc; i++) {
sdsfreesplitres(vhosts[i-1], 3);
}
free(vhosts);
}
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, 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");
/*
* Accept connection on the socket
*/
struct sockaddr_in sa_client;
socklen_t sa_client_size = sizeof(struct sockaddr_in);
int fd_client;
int count = 0;
while (count < 5) {
herr(fd_client = accept(fd_socket, (struct sockaddr*)&sa_client, &sa_client_size), "accept");
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);
}
close(fd_socket);
printf("Exiting");
while(wait(NULL) > 0);
freeVhosts(vhosts, argc);
}
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