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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 <util.h>
struct se_vhost {
char *username;
char *path_root;
char *path_error;
};
char* constructFilePath(const char* root, const char* file) {
if (root == NULL || file == NULL) return NULL;
int rootLen = strlen(root), fileLen = strlen(file);
int rootEndOnSlash = root[rootLen - 1] == '/' || file[0] == '/';
int fileEndOnSlash = file[fileLen - 1] == '/';
int pathLen = rootLen + !rootEndOnSlash + fileLen + (fileEndOnSlash * 8) + 1;
char* path = malloc(pathLen * sizeof(char));
memset(path, 0, pathLen);
strncpy(path, root, rootLen);
if (!rootEndOnSlash) strcat(path, "/");
strcat(path, file);
if (fileEndOnSlash) strcat(path, "index.md");
return path;
}
void on_connection(const int fd_client, const struct se_vhost *vhosts, const int vhostsc) {
printf("[%d] Connected successfully!\n", fd_client);
char address[256];
read(fd_client, address, 256);
printf("[%d] Requested %s\n", fd_client, address);
int usernameLen = strchr(address, '@') - address;
const struct se_vhost *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, "[%d] Unknown username in address %s\n", fd_client, address);
return;
}
char* filePath = constructFilePath(vhost->path_root, address + usernameLen + 1);
int fd = open(filePath, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "[%d] Error opening %s\n", fd_client, filePath);
free(filePath);
filePath = constructFilePath(vhost->path_root, vhost->path_error);
fd = open(filePath, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "[%d] Error opening %s\n", fd_client, filePath);
free(filePath);
return;
}
}
printf("[%d] Serving %s\n", fd_client, filePath);
free(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));
}
close(fd);
printf("[%d] Served!\n", fd_client);
}
int main(int argc, char* argv[]) {
/*
* 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 se_vhost vhosts[1] = {
{
.username = "hello",
.path_root = ".",
.path_error = NULL,
} };
struct sockaddr_in sa_client;
socklen_t sa_client_size = sizeof(struct sockaddr_in);
int fd_client;
int count = 0;
while (count < 2) {
herr(fd_client = accept(fd_socket, (struct sockaddr*)&sa_client, &sa_client_size), "accept");
count++;
int fp = fork();
if (fp == 0) {
close(fd_socket);
on_connection(fd_client, vhosts, 1);
close(fd_client);
return 0;
}
close(fd_client);
}
close(fd_socket);
printf("Exiting");
while(wait(NULL) > 0);
}
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