/*
 * svc_telnet.c
 * Telnet honeypot handler — login prompt + user/pass capture + tarpit.
 */
#include "sdkconfig.h"

#ifdef CONFIG_MODULE_HONEYPOT

#include "svc_common.h"

void handle_telnet_client(int client_fd, const char *client_ip,
                          uint16_t client_port, hp_svc_desc_t *svc)
{
    char banner[128];
    hp_config_get_banner("telnet", banner, sizeof(banner));
    send(client_fd, banner, strlen(banner), 0);

    svc->connections++;
    event_send("SVC_CONNECT", "LOW", "00:00:00:00:00:00",
        client_ip, client_port, 23, "service=telnet", NULL);

    /* Read username */
    char user[64] = {0};
    int n = recv(client_fd, user, sizeof(user) - 1, 0);
    if (n > 0) {
        user[n] = '\0';
        while (n > 0 && (user[n-1] == '\r' || user[n-1] == '\n'))
            user[--n] = '\0';
    }

    /* Send password prompt */
    const char *pass_prompt = "Password: ";
    send(client_fd, pass_prompt, strlen(pass_prompt), 0);

    char pass[64] = {0};
    n = recv(client_fd, pass, sizeof(pass) - 1, 0);
    if (n > 0) {
        pass[n] = '\0';
        while (n > 0 && (pass[n-1] == '\r' || pass[n-1] == '\n'))
            pass[--n] = '\0';
    }

    if (user[0] || pass[0]) {
        svc->auth_attempts++;
        char detail[192];
        snprintf(detail, sizeof(detail),
            "service=telnet user='%.32s' pass='%.32s'", user, pass);
        event_send("SVC_AUTH_ATTEMPT", "HIGH", "00:00:00:00:00:00",
            client_ip, client_port, 23, detail, NULL);
    }

    const char *fail = "\r\nLogin incorrect\r\n";
    send(client_fd, fail, strlen(fail), 0);

    int tarpit = hp_config_get_threshold("tarpit_ms");
    if (tarpit > 0)
        vTaskDelay(pdMS_TO_TICKS(tarpit));
}

#endif