unit-test-server.c
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/*
* Copyright © Stéphane Raimbault <stephane.raimbault@gmail.com>
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <errno.h>
#include <modbus.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
// clang-format off
#ifdef _WIN32
# include <winsock2.h>
#else
# include <sys/socket.h>
#endif
/* For MinGW */
#ifndef MSG_NOSIGNAL
# define MSG_NOSIGNAL 0
#endif
// clang-format on
#include "unit-test.h"
enum {
TCP,
TCP_PI,
RTU
};
int main(int argc, char *argv[])
{
int s = -1;
modbus_t *ctx;
modbus_mapping_t *mb_mapping;
int rc;
int i;
int use_backend;
uint8_t *query;
int header_length;
char *ip_or_device;
if (argc > 1) {
if (strcmp(argv[1], "tcp") == 0) {
use_backend = TCP;
} else if (strcmp(argv[1], "tcppi") == 0) {
use_backend = TCP_PI;
} else if (strcmp(argv[1], "rtu") == 0) {
use_backend = RTU;
} else {
printf("Modbus server for unit testing.\n");
printf("Usage:\n %s [tcp|tcppi|rtu] [<ip or device>]\n", argv[0]);
printf("Eg. tcp 127.0.0.1 or rtu /dev/ttyUSB0\n\n");
return -1;
}
} else {
/* By default */
use_backend = TCP;
}
if (argc > 2) {
ip_or_device = argv[2];
} else {
switch (use_backend) {
case TCP:
ip_or_device = "127.0.0.1";
break;
case TCP_PI:
ip_or_device = "::1";
break;
case RTU:
ip_or_device = "/dev/ttyUSB0";
break;
default:
break;
}
}
if (use_backend == TCP) {
ctx = modbus_new_tcp(ip_or_device, 1502);
query = malloc(MODBUS_TCP_MAX_ADU_LENGTH);
} else if (use_backend == TCP_PI) {
ctx = modbus_new_tcp_pi(ip_or_device, "1502");
query = malloc(MODBUS_TCP_MAX_ADU_LENGTH);
} else {
ctx = modbus_new_rtu(ip_or_device, 115200, 'N', 8, 1);
modbus_set_slave(ctx, SERVER_ID);
query = malloc(MODBUS_RTU_MAX_ADU_LENGTH);
}
header_length = modbus_get_header_length(ctx);
modbus_set_debug(ctx, TRUE);
mb_mapping = modbus_mapping_new_start_address(UT_BITS_ADDRESS,
UT_BITS_NB,
UT_INPUT_BITS_ADDRESS,
UT_INPUT_BITS_NB,
UT_REGISTERS_ADDRESS,
UT_REGISTERS_NB_MAX,
UT_INPUT_REGISTERS_ADDRESS,
UT_INPUT_REGISTERS_NB);
if (mb_mapping == NULL) {
fprintf(stderr, "Failed to allocate the mapping: %s\n", modbus_strerror(errno));
modbus_free(ctx);
return -1;
}
/* Examples from PI_MODBUS_300.pdf.
Only the read-only input values are assigned. */
/* Initialize input values that's can be only done server side. */
modbus_set_bits_from_bytes(
mb_mapping->tab_input_bits, 0, UT_INPUT_BITS_NB, UT_INPUT_BITS_TAB);
/* Initialize values of INPUT REGISTERS */
for (i = 0; i < UT_INPUT_REGISTERS_NB; i++) {
mb_mapping->tab_input_registers[i] = UT_INPUT_REGISTERS_TAB[i];
}
if (use_backend == TCP) {
s = modbus_tcp_listen(ctx, 1);
modbus_tcp_accept(ctx, &s);
} else if (use_backend == TCP_PI) {
s = modbus_tcp_pi_listen(ctx, 1);
modbus_tcp_pi_accept(ctx, &s);
} else {
rc = modbus_connect(ctx);
if (rc == -1) {
fprintf(stderr, "Unable to connect %s\n", modbus_strerror(errno));
modbus_free(ctx);
return -1;
}
}
for (;;) {
do {
rc = modbus_receive(ctx, query);
/* Filtered queries return 0 */
} while (rc == 0);
/* The connection is not closed on errors which require on reply such as
bad CRC in RTU. */
if (rc == -1 && errno != EMBBADCRC) {
/* Quit */
break;
}
/* Special server behavior to test client */
if (query[header_length] == 0x03) {
/* Read holding registers */
if (MODBUS_GET_INT16_FROM_INT8(query, header_length + 3) ==
UT_REGISTERS_NB_SPECIAL) {
printf("Set an incorrect number of values\n");
MODBUS_SET_INT16_TO_INT8(
query, header_length + 3, UT_REGISTERS_NB_SPECIAL - 1);
} else if (MODBUS_GET_INT16_FROM_INT8(query, header_length + 1) ==
UT_REGISTERS_ADDRESS_SPECIAL) {
printf("Reply to this special register address by an exception\n");
modbus_reply_exception(ctx, query, MODBUS_EXCEPTION_SLAVE_OR_SERVER_BUSY);
continue;
} else if (MODBUS_GET_INT16_FROM_INT8(query, header_length + 1) ==
UT_REGISTERS_ADDRESS_INVALID_TID_OR_SLAVE) {
const int RAW_REQ_LENGTH = 5;
uint8_t raw_req[] = {(use_backend == RTU) ? INVALID_SERVER_ID : 0xFF,
0x03,
0x02,
0x00,
0x00};
printf("Reply with an invalid TID or slave\n");
modbus_send_raw_request(ctx, raw_req, RAW_REQ_LENGTH * sizeof(uint8_t));
continue;
} else if (MODBUS_GET_INT16_FROM_INT8(query, header_length + 1) ==
UT_REGISTERS_ADDRESS_SLEEP_500_MS) {
printf("Sleep 0.5 s before replying\n");
usleep(500000);
} else if (MODBUS_GET_INT16_FROM_INT8(query, header_length + 1) ==
UT_REGISTERS_ADDRESS_BYTE_SLEEP_5_MS) {
/* Test low level only available in TCP mode */
/* Catch the reply and send reply byte a byte */
uint8_t req[] = "\x00\x1C\x00\x00\x00\x05\xFF\x03\x02\x00\x00";
int req_length = 11;
int w_s = modbus_get_socket(ctx);
if (w_s == -1) {
fprintf(stderr, "Unable to get a valid socket in special test\n");
continue;
}
/* Copy TID */
req[1] = query[1];
for (i = 0; i < req_length; i++) {
printf("(%.2X)", req[i]);
usleep(5000);
rc = send(w_s, (const char *) (req + i), 1, MSG_NOSIGNAL);
if (rc == -1) {
break;
}
}
continue;
}
}
rc = modbus_reply(ctx, query, rc, mb_mapping);
if (rc == -1) {
break;
}
}
printf("Quit the loop: %s\n", modbus_strerror(errno));
if (use_backend == TCP) {
if (s != -1) {
close(s);
}
}
modbus_mapping_free(mb_mapping);
free(query);
/* For RTU */
modbus_close(ctx);
modbus_free(ctx);
return 0;
}