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| #include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#define PORT 8000
#define BUFFER_SIZE 1024
typedef struct {
char *content;
int size;
} FileWithSize;
bool ends_with(char *text, char *suffix) {
int text_length = strlen(text);
int suffix_length = strlen(suffix);
return text_length >= suffix_length && \
strncmp(text+text_length-suffix_length, suffix, suffix_length) == 0;
}
FileWithSize *read_file(char *filename) {
if (!ends_with(filename, ".html") && !ends_with(filename, ".png") && !ends_with(filename, ".css") && !ends_with(filename, ".js")) return NULL;
char real_path[BUFFER_SIZE];
snprintf(real_path, sizeof(real_path), "public/%s", filename);
FILE *fd = fopen(real_path, "r");
if (!fd) return NULL;
fseek(fd, 0, SEEK_END);
long filesize = ftell(fd);
fseek(fd, 0, SEEK_SET);
char *content = malloc(filesize + 1);
if (!content) return NULL;
fread(content, 1, filesize, fd);
content[filesize] = '\0';
fclose(fd);
FileWithSize *file = malloc(sizeof(FileWithSize));
file->content = content;
file->size = filesize;
return file;
}
void build_response(int socket_id, int status_code, char* status_description, FileWithSize *file) {
char *response_body_fmt =
"HTTP/1.1 %u %s\r\n"
"Server: mystiz-web/1.0.0\r\n"
"Content-Type: text/html\r\n"
"Connection: %s\r\n"
"Content-Length: %u\r\n"
"\r\n";
char response_body[BUFFER_SIZE];
sprintf(response_body,
response_body_fmt,
status_code,
status_description,
status_code == 200 ? "keep-alive" : "close",
file->size);
write(socket_id, response_body, strlen(response_body));
write(socket_id, file->content, file->size);
free(file->content);
free(file);
return;
}
void handle_client(int socket_id) {
char buffer[BUFFER_SIZE];
char requested_filename[BUFFER_SIZE];
while (1) {
memset(buffer, 0, sizeof(buffer));
memset(requested_filename, 0, sizeof(requested_filename));
if (read(socket_id, buffer, BUFFER_SIZE) == 0) return;
if (sscanf(buffer, "GET /%s", requested_filename) != 1)
return build_response(socket_id, 500, "Internal Server Error", read_file("500.html"));
FileWithSize *file = read_file(requested_filename);
if (!file)
return build_response(socket_id, 404, "Not Found", read_file("404.html"));
build_response(socket_id, 200, "OK", file);
}
}
int main() {
setvbuf(stdin, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
struct sockaddr_in server_address;
struct sockaddr_in client_address;
int socket_id = socket(AF_INET, SOCK_STREAM, 0);
server_address.sin_family = AF_INET;
server_address.sin_addr.s_addr = htonl(INADDR_ANY);
server_address.sin_port = htons(PORT);
if (bind(socket_id, (struct sockaddr*)&server_address, sizeof(server_address)) == -1) exit(1);
if (listen(socket_id, 5) < 0) exit(1);
while (1) {
int client_address_len;
int new_socket_id = accept(socket_id, (struct sockaddr *)&client_address, (socklen_t*)&client_address_len);
if (new_socket_id < 0) exit(1);
int pid = fork();
if (pid == 0) {
handle_client(new_socket_id);
close(new_socket_id);
}
}
}
|
