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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include "log.h"
#include "server.h"
#define BUF_CAP 65536
#define COMMON_CAP 1024
#define REQ_PATH_CAP 512
#define PORT "8079"
#define MIN(a,b) (((a)<(b))?(a):(b))
#define _SEND_BUF_ADD(str) do { \
size_t n = MIN(strlen(str), BUF_CAP - (size_t)send_buf_sz); \
memcpy(&send_buf[send_buf_sz], str, n); \
send_buf_sz += n; \
} while(0)
#define _SEND_BUF_ADD_LINE(str) do { \
_SEND_BUF_ADD(str); \
_SEND_BUF_ADD("\r\n"); \
} while(0)
#define SEND_BUF_ADD(str) do { \
size_t n = MIN(strlen(str), BUF_CAP - (size_t)*send_buf_sz); \
memcpy(&send_buf[*send_buf_sz], str, strlen(str)); \
*send_buf_sz += n; \
} while(0)
#define SEND_BUF_ADD_LINE(str) do { \
SEND_BUF_ADD(str); \
SEND_BUF_ADD("\r\n"); \
} while(0)
#define SEND_BUF_ADD_LINE_LONG(lon) do { \
char str[COMMON_CAP]; \
snprintf(str, COMMON_CAP, "%ld", lon); \
SEND_BUF_ADD_LINE(str); \
} while(0)
#ifdef USE_LIBMAGIC
#include <magic.h>
static int get_content_type(char *file_path, char *content_type)
{
int ret = 1;
magic_t magic;
if((magic = magic_open(MAGIC_MIME)) == NULL) {
err("magic_open: %s", magic_error(magic));
return ret;
}
if(magic_load(magic, NULL) != 0) {
err("magic_load: %s", magic_error(magic));
goto close;
}
const char *mime = magic_file(magic, file_path);
if(mime == NULL) {
err("magic_file: %s", magic_error(magic));
goto close;
}
if(strlen(mime) >= COMMON_CAP) {
err("get_content_type: mime info too long");
goto close;
}
memcpy(content_type, mime, strlen(mime));
ret = 0;
close:
magic_close(magic);
return ret;
}
#else
static int get_content_type(char *file_path, char *content_type)
{
(void)file_path;
(void)content_type;
return 0;
}
#endif
static int try_file(char *req_path, FILE **fp, char *content_type)
{
// req_path error check 0
if(strlen(req_path) > REQ_PATH_CAP) {
err("try_file: requested path longer than %d characters", REQ_PATH_CAP);
return 1;
}
// req_path error check 1
for(size_t i = 1; i < strlen(req_path); i++) {
if(req_path[i-1] == '.' && req_path[i] == '.') {
err("try_file: the requested path %s includes ..", req_path);
return 1;
}
}
char file_path[COMMON_CAP];
snprintf(file_path, COMMON_CAP, "%s%s", FILES,
(strlen(req_path) == 1) ? "/index.html" : req_path);
*fp = fopen(file_path, "r");
if(!(*fp)) {
err("fopen: file %s: %s", file_path, strerror(errno));
return 1;
}
info("fopen: file %s was opened", file_path);
if(get_content_type(file_path, content_type) != 0) {
err("get_content_type: failed");
fclose(*fp);
return 1;
}
return 0;
}
static int on_get(char *send_buf, ssize_t *send_buf_sz, char *req_path)
{
int ret = 1;
char content_type[COMMON_CAP] = {0};
FILE *fp;
if(try_file(req_path, &fp, content_type) != 0) {
if(errno == 2) { // 2 is 'No such file or directory'
SEND_BUF_ADD_LINE("404");
if(try_file("/404.html", &fp, content_type) != 0) return ret;
} else {
SEND_BUF_ADD_LINE("500");
if(try_file("/500.html", &fp, content_type) != 0) return ret;
}
} else {
SEND_BUF_ADD_LINE("200");
}
SEND_BUF_ADD_LINE("Server: potato");
SEND_BUF_ADD("Content-Type: ");
SEND_BUF_ADD_LINE(content_type);
if(fseek(fp, 0, SEEK_END) != 0) {
err("fseek: %s", strerror(errno));
goto close;
}
size_t file_sz = ftell(fp);
if(file_sz == 0) {
err("ftell: %s", strerror(errno));
goto close;
}
rewind(fp);
SEND_BUF_ADD("Content-Lenght: ");
SEND_BUF_ADD_LINE_LONG(file_sz);
SEND_BUF_ADD("\r\n");
fread(&send_buf[*send_buf_sz], sizeof(char), file_sz, fp);
*send_buf_sz += file_sz;
ret = 0;
close:
fclose(fp);
return ret;
}
static int handle_connection(sock_t *conn)
{
char recv_buf[BUF_CAP] = {0};
ssize_t recv_buf_len = server_recv(conn, recv_buf, BUF_CAP);
if(recv_buf_len == 0) {
return 0;
} else if(recv_buf_len < 0) {
err("server_recv: %s", strerror(errno));
return 1;
}
/* HANDLE REQUEST */
char send_buf[BUF_CAP];
ssize_t send_buf_sz = 0;
_SEND_BUF_ADD("HTTP/1.1 ");
char recv_buf_cpy[BUF_CAP];
memcpy(recv_buf_cpy, recv_buf, recv_buf_len);
char *req_method = strtok(recv_buf_cpy, " ");
if(strcmp(req_method, "GET") == 0) {
if(on_get(send_buf, &send_buf_sz, strtok(NULL, " "))) {
err("on_get: failed");
return 1;
}
} else {
err("request method %s has not been implemented", req_method);
return 1;
}
ssize_t sent_sz = server_send(conn, send_buf, send_buf_sz);
if(sent_sz < 0) {
err("server_send: %s", strerror(errno));
return 1;
} else if(sent_sz != send_buf_sz) {
err("server_send: sent %ld out of %ld bytes", sent_sz, send_buf_sz);
}
return 0;
}
int main(void)
{
signal(SIGCHLD, SIG_IGN); // now i dont have to wait()
sock_t *sock = server_sock_create();
if(server_start(PORT, sock) != 0) {
err("server_init: failed");
return 1;
}
for(int i = 0; ; i++) {
sock_t *conn = server_sock_create();
if(server_accept(sock, conn) != 0) {
err("server_accept: failed");
}
info("server: got connection with %s", server_connection_ip(conn));
pid_t p = fork();
if(p == 0) {
server_sock_close(sock);
if(handle_connection(conn) != 0) {
err("handle_connection: failed");
} else {
info("server: got disconnected with %s", server_connection_ip(conn));
}
server_sock_close(conn);
return 0;
} else if (p < 0){
err("fork: %s", strerror(errno));
return 1;
}
server_sock_close(conn);
}
server_sock_close(sock);
return 0;
}
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