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| #define _GNU_SOURCE
#include <string.h>
#include <strings.h>
#include <sys/socket.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <sys/sendfile.h>
#define PORT 8080
void parse_method(const char *req, char *method) {
sscanf(req, "%7s", method);
}
void parse_path(const char *req, char *path) {
sscanf(req, "%*s %255s", path);
}
int get_content_length(const char *req) {
const char *p = strcasestr(req, "Content-Length:");
if (!p) return 0;
p += strlen("Content-Length:");
while (*p == ' ') p++;
return atoi(p);
}
int main() {
int s = socket(AF_INET, SOCK_STREAM, 0);
int opt = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
struct sockaddr_in addr = {0};
addr.sin_family = AF_INET;
addr.sin_port = htons(PORT);
addr.sin_addr.s_addr = INADDR_ANY;
bind(s, (struct sockaddr*)&addr, sizeof(addr));
listen(s, SOMAXCONN);
printf("Server running on http://0.0.0.0:%d\n", PORT);
while (1) {
int client = accept(s, NULL, NULL);
char buffer[4096] = {0};
int received = recv(client, buffer, sizeof(buffer), 0);
if (received <= 0) {
close(client);
continue;
}
char method[8] = {0};
char path[256] = {0};
parse_method(buffer, method);
parse_path(buffer, path);
printf("Method: %s, Path: %s\n", method, path);
if (strcmp(method, "GET") == 0 && strcmp(path, "/") == 0) {
int fd = open("index.html", O_RDONLY);
if (fd < 0) {
const char *err = "HTTP/1.1 404 Not Found\r\n"
"Content-Type: text/plain\r\n"
"Content-Length: 13\r\n\r\n"
"404 Not Found";
write(client, err, strlen(err));
close(client);
continue;
}
struct stat st;
fstat(fd, &st);
char header[256];
int len = snprintf(header, sizeof(header),
"HTTP/1.1 200 OK\r\n"
"Content-Type: text/html\r\n"
"Content-Length: %zu\r\n\r\n",
st.st_size
);
write(client, header, len);
off_t offset = 0;
sendfile(client, fd, &offset, st.st_size);
close(fd);
close(client);
continue;
}
if (strcmp(method, "POST") == 0 && strcmp(path, "/submit") == 0) {
int content_length = get_content_length(buffer);
char *body = strstr(buffer, "\r\n\r\n");
if (body) body += 4;
printf("POST body: %.*s\n", content_length, body);
char json[256];
snprintf(json, sizeof(json),
"{\"status\":\"ok\",\"received\":\"%.*s\"}",
content_length, body
);
char header[256];
int len = snprintf(header, sizeof(header),
"HTTP/1.1 200 OK\r\n"
"Content-Type: application/json\r\n"
"Content-Length: %zu\r\n\r\n",
strlen(json)
);
write(client, header, len);
write(client, json, strlen(json));
close(client);
continue;
}
const char *err = "HTTP/1.1 404 Not Found\r\n"
"Content-Type: text/plain\r\n"
"Content-Length: 13\r\n\r\n"
"404 Not Found";
write(client, err, strlen(err));
close(client);
}
close(s);
return 0;
}
|
