esp-protocols/components/mdns/tests/test_afl_fuzz_host/test.c

/*
 * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>

#include "esp32_mock.h"
#include "mdns.h"
#include "mdns_private.h"

//
// Global stuctures containing packet payload, search
mdns_rx_packet_t g_packet;
struct pbuf mypbuf;
mdns_search_once_t *search = NULL;

//
// Dependency injected test functions
void mdns_test_execute_action(void *action);
mdns_srv_item_t *mdns_test_mdns_get_service_item(const char *service, const char *proto);
mdns_search_once_t *mdns_test_search_init(const char *name, const char *service, const char *proto, uint16_t type, uint32_t timeout, uint8_t max_results);
esp_err_t mdns_test_send_search_action(mdns_action_type_t type, mdns_search_once_t *search);
void mdns_test_search_free(mdns_search_once_t *search);
void mdns_test_init_di(void);
extern mdns_server_t *_mdns_server;

//
// mdns function wrappers for mdns setup in test mode
static int mdns_test_hostname_set(const char *mdns_hostname)
{
    for (int i = 0; i < MDNS_MAX_INTERFACES; i++) {
        _mdns_server->interfaces[i].pcbs[MDNS_IP_PROTOCOL_V4].state = PCB_RUNNING;    // mark the PCB running to exercise mdns in fully operational mode
        _mdns_server->interfaces[i].pcbs[MDNS_IP_PROTOCOL_V6].state = PCB_RUNNING;
    }
    int ret = mdns_hostname_set(mdns_hostname);
    mdns_action_t *a = NULL;
    GetLastItem(&a);
    mdns_test_execute_action(a);
    return ret;
}

static int mdns_test_add_delegated_host(const char *mdns_hostname)
{
    mdns_ip_addr_t addr = { .addr = { .u_addr = ESP_IPADDR_TYPE_V4 } };
    addr.addr.u_addr.ip4.addr = 0x11111111;
    int ret = mdns_delegate_hostname_add(mdns_hostname, &addr);
    mdns_action_t *a = NULL;
    GetLastItem(&a);
    mdns_test_execute_action(a);
    return ret;
}


static int mdns_test_service_instance_name_set(const char *service, const char *proto, const char *instance)
{
    int ret = mdns_service_instance_name_set(service, proto, instance);
    mdns_action_t *a = NULL;
    GetLastItem(&a);
    mdns_test_execute_action(a);
    return ret;
}

static int mdns_test_service_txt_set(const char *service, const char *proto,  uint8_t num_items, mdns_txt_item_t txt[])
{
    int ret = mdns_service_txt_set(service, proto, txt, num_items);
    mdns_action_t *a = NULL;
    GetLastItem(&a);
    mdns_test_execute_action(a);
    return ret;
}

static int mdns_test_sub_service_add(const char *sub_name, const char *service_name, const char *proto, uint32_t port)
{
    if (mdns_service_add(NULL, service_name, proto, port, NULL, 0)) {
        // This is expected failure as the service thread is not running
    }
    mdns_action_t *a = NULL;
    GetLastItem(&a);
    mdns_test_execute_action(a);

    if (mdns_test_mdns_get_service_item(service_name, proto) == NULL) {
        return ESP_FAIL;
    }
    int ret = mdns_service_subtype_add_for_host(NULL, service_name, proto, NULL, sub_name);
    a = NULL;
    GetLastItem(&a);
    mdns_test_execute_action(a);
    return ret;
}

static int mdns_test_service_add(const char *service_name, const char *proto, uint32_t port)
{
    if (mdns_service_add(NULL, service_name, proto, port, NULL, 0)) {
        // This is expected failure as the service thread is not running
    }
    mdns_action_t *a = NULL;
    GetLastItem(&a);
    mdns_test_execute_action(a);

    if (mdns_test_mdns_get_service_item(service_name, proto) == NULL) {
        return ESP_FAIL;
    }
    return ESP_OK;
}

static mdns_result_t *mdns_test_query(const char *name, const char *service, const char *proto, uint16_t type)
{
    search = mdns_test_search_init(name, service, proto, type, 3000, 20);
    if (!search) {
        abort();
    }

    if (mdns_test_send_search_action(ACTION_SEARCH_ADD, search)) {
        mdns_test_search_free(search);
        abort();
    }

    mdns_action_t *a = NULL;
    GetLastItem(&a);
    mdns_test_execute_action(a);
    return NULL;
}

static void mdns_test_query_free(void)
{
    mdns_test_search_free(search);
}

//
// function "under test" where afl-mangled packets passed
//
void mdns_parse_packet(mdns_rx_packet_t *packet);

//
// Test starts here
//
int main(int argc, char **argv)
{
    int i;
    const char *mdns_hostname = "minifritz";
    const char *mdns_instance = "Hristo's Time Capsule";
    mdns_txt_item_t arduTxtData[4] = {
        {"board", "esp32"},
        {"tcp_check", "no"},
        {"ssh_upload", "no"},
        {"auth_upload", "no"}
    };

    const uint8_t mac[6] = {0xDE, 0xAD, 0xBE, 0xEF, 0x00, 0x32};

    uint8_t buf[1460];
    char winstance[21 + strlen(mdns_hostname)];

    sprintf(winstance, "%s [%02x:%02x:%02x:%02x:%02x:%02x]", mdns_hostname, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);

    // Init depencency injected methods
    mdns_test_init_di();

    if (mdns_init()) {
        abort();
    }

    if (mdns_test_hostname_set(mdns_hostname)) {
        abort();
    }

    if (mdns_test_add_delegated_host(mdns_hostname) || mdns_test_add_delegated_host("megafritz")) {
        abort();
    }

#ifndef MDNS_NO_SERVICES

    if (mdns_test_sub_service_add("_server", "_fritz", "_tcp", 22)) {
        abort();
    }

    if (mdns_test_service_add("_telnet", "_tcp", 22)) {
        abort();
    }

    if (mdns_test_service_add("_workstation", "_tcp", 9)) {
        abort();
    }
    if (mdns_test_service_instance_name_set("_workstation", "_tcp", winstance)) {
        abort();
    }

    if (mdns_test_service_add("_arduino", "_tcp", 3232)) {
        abort();
    }

    if (mdns_test_service_txt_set("_arduino", "_tcp", 4, arduTxtData)) {
        abort();
    }

    if (mdns_test_service_add("_http", "_tcp", 80)) {
        abort();
    }

    if (mdns_test_service_instance_name_set("_http", "_tcp", "ESP WebServer")) {
        abort();
    }

    if (
        mdns_test_service_add("_afpovertcp", "_tcp", 548)
        || mdns_test_service_add("_rfb", "_tcp", 885)
        || mdns_test_service_add("_smb", "_tcp", 885)
        || mdns_test_service_add("_adisk", "_tcp", 885)
        || mdns_test_service_add("_airport", "_tcp", 885)
        || mdns_test_service_add("_printer", "_tcp", 885)
        || mdns_test_service_add("_airplay", "_tcp", 885)
        || mdns_test_service_add("_raop", "_tcp", 885)
        || mdns_test_service_add("_uscan", "_tcp", 885)
        || mdns_test_service_add("_uscans", "_tcp", 885)
        || mdns_test_service_add("_ippusb", "_tcp", 885)
        || mdns_test_service_add("_scanner", "_tcp", 885)
        || mdns_test_service_add("_ipp", "_tcp", 885)
        || mdns_test_service_add("_ipps", "_tcp", 885)
        || mdns_test_service_add("_pdl-datastream", "_tcp", 885)
        || mdns_test_service_add("_ptp", "_tcp", 885)
        || mdns_test_service_add("_sleep-proxy", "_udp", 885)) {
        abort();
    }
#endif
    mdns_result_t *results = NULL;
    FILE *file;
    size_t nread;

#ifdef INSTR_IS_OFF
    size_t len = 1460;
    memset(buf, 0, 1460);

    if (argc != 2) {
        printf("Non-instrumentation mode: please supply a file name created by AFL to reproduce crash\n");
        return 1;
    } else {
        //
        // Note: parameter1 is a file (mangled packet) which caused the crash
        file = fopen(argv[1], "r");
        assert(file >= 0);
        len = fread(buf, 1, 1460, file);
        fclose(file);
    }

    for (i = 0; i < 1; i++) {
#else
    while (__AFL_LOOP(1000)) {
        memset(buf, 0, 1460);
        size_t len = read(0, buf, 1460);
#endif
        mypbuf.payload = malloc(len);
        memcpy(mypbuf.payload, buf, len);
        mypbuf.len = len;
        g_packet.pb = &mypbuf;
        mdns_test_query("minifritz", "_fritz", "_tcp", MDNS_TYPE_ANY);
        mdns_test_query(NULL, "_fritz", "_tcp", MDNS_TYPE_PTR);
        mdns_test_query(NULL, "_afpovertcp", "_tcp", MDNS_TYPE_PTR);
        mdns_parse_packet(&g_packet);
        free(mypbuf.payload);
    }
#ifndef MDNS_NO_SERVICES
    mdns_service_remove_all();
    mdns_action_t *a = NULL;
    GetLastItem(&a);
    mdns_test_execute_action(a);
#endif
    ForceTaskDelete();
    mdns_free();
    return 0;
}