112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
#define _GNU_SOURCE
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#include <arpa/inet.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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static void die(const char *msg) {
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perror(msg);
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exit(1);
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}
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static void setup_stdio(void) {
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setvbuf(stdout, NULL, _IONBF, 0);
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setvbuf(stderr, NULL, _IONBF, 0);
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}
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__attribute__((used))
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void win(void) {
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system("/bin/sh");
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}
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__attribute__((noinline))
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void vuln(void) {
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char buf[128];
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puts("Enter your signal log entry: ");
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read(STDIN_FILENO, buf, 0x200);
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}
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__attribute__((noinline))
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void handle_client(int fd) {
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FILE *f = fdopen(fd, "r+");
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if (!f) die("fdopen");
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dup2(fd, 0); dup2(fd, 1); dup2(fd, 2);
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setup_stdio();
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puts("=== Lighthouse Control Panel ===");
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puts("1) Record signal log");
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puts("2) Disconnect");
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printf("> ");
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char choice[8];
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if (!fgets(choice, sizeof choice, f)) return;
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switch (choice[0]) {
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case '1':
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vuln();
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puts("Log entry recorded. Over and out.");
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return;
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case '2':
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puts("Disconnecting. Fair winds.");
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return;
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default:
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puts("Unknown command. Disconnecting.");
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break;
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}
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}
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static void reap(int sig) {
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(void)sig;
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while (waitpid(-1, NULL, WNOHANG) > 0) {}
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}
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int main(int argc, char **argv) {
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(void)argc; (void)argv;
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setup_stdio();
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signal(SIGCHLD, reap);
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int port = 9001;
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const char *env_port = getenv("PORT");
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if (env_port) port = atoi(env_port);
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int s = socket(AF_INET, SOCK_STREAM, 0);
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if (s < 0) die("socket");
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int one = 1;
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setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
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struct sockaddr_in addr = {0};
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = htonl(INADDR_ANY);
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addr.sin_port = htons((uint16_t)port);
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if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) die("bind");
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if (listen(s, 16) < 0) die("listen");
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printf("[*] Lighthouse beacon active on port %d\n", port);
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for (;;) {
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struct sockaddr_in cli; socklen_t cl = sizeof cli;
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int c = accept(s, (struct sockaddr *)&cli, &cl);
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if (c < 0) {
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if (errno == EINTR) continue;
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die("accept");
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}
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pid_t pid = fork();
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if (pid < 0) die("fork");
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if (pid == 0) {
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// Child
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close(s);
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handle_client(c);
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close(c);
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_exit(0);
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}
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close(c);
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}
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}
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