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#include <asm-generic/socket.h>
#include <errno.h>
#include <netdb.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sendfile.h>
#include <unistd.h>
typedef enum { GET = 0, POST = 1, UNKNOWN = -1 } HTTP_METHODS;
int shsd_sendfile(int in_fd, FILE *ou_fd)
{
struct stat s;
int stat_result = fstat(fileno(ou_fd), &s);
if (stat_result != 0) {
perror("fstat");
return -1;
}
sendfile(in_fd, fileno(ou_fd), NULL, s.st_size);
return 0;
}
HTTP_METHODS get_require_method(char *method)
{
HTTP_METHODS m;
if (strcmp(method, "GET") == 0) {
return m = GET;
}
if (strcmp(method, "POST") == 0) {
return m = POST;
}
else {
return m = UNKNOWN;
}
}
int check_file_stat(const char *path, int fd)
{
struct stat st;
if (stat(path, &st) == -1 && S_ISDIR(st.st_mode)) {
return -1;
}
return 0;
}
int handle_client(int client_fd, char *buf)
{
char method[16], path[256];
if (sscanf(buf, "%15s %255s", method, path) < 2) {
close(client_fd);
return -1;
}
if (strcmp(path, "/") == 0) {
strcpy(path, "/index.html");
}
char local_path[1024];
snprintf(local_path, sizeof(local_path), "./www%s", path);
FILE *fp = fopen(local_path, "r");
if (!fp) {
perror("fopen");
fp = fopen("./www/404.html", "r");
shsd_sendfile(client_fd, fp);
return -1;
}
shsd_sendfile(client_fd, fp);
return 0;
}
int main(int argc, char **argv)
{
struct addrinfo hints, *res, *servinfo;
struct sockaddr_storage their_addr;
socklen_t addr_size;
int sockfd, new_fd;
int yes = 1;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET; // use IPv4 or IPv6, whichever
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE; // fill in my IP for me
getaddrinfo(NULL, argv[1], &hints, &res);
sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) ==
-1) {
perror("setsockopt");
exit(1);
}
if (bind(sockfd, res->ai_addr, res->ai_addrlen) == -1) {
perror("bind");
close(sockfd);
exit(1);
}
if (listen(sockfd, 10) == -1) {
perror("listen");
close(sockfd);
exit(1);
}
addr_size = sizeof(their_addr);
char buf[1024];
memset(buf, 0, 1024);
int recv_result;
while (1) {
new_fd = accept(sockfd, (struct sockaddr *)&their_addr,
&addr_size);
recv_result = recv(new_fd, (void *)buf, 1024, 0);
if (recv_result == -1) {
perror("recv");
return -1;
}
for (int i = 0; i < sizeof(buf); i++) {
printf("%c", buf[i]);
}
if (strncmp(buf, "GET", 3) == 0) {
char *http_status = "HTTP/1.1 200 OK\r\n";
char *http_content_type = "text/html\r\n\r\n";
printf("Received GET request.\n");
send(new_fd, http_status, strlen(http_status), 0);
send(new_fd, http_content_type,
strlen(http_content_type), 0);
handle_client(new_fd, buf);
}
memset(buf, 0, 1024);
close(new_fd);
}
close(sockfd);
close(new_fd);
return 0;
}
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