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/*
* Copyright 2014-present Facebook. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <sched.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include "modbus.h"
#include "rackmond.h"
void usage() {
fprintf(stderr,
"modbuscmd [-v] [-t <timeout in ms>] [-x <expected response length>] modbus_command\n"
"\tmodbus command should be specified in hex\n"
"\teg:\ta40300000008\n"
"\tif an expected response length is provided, modbuscmd will stop receving and check crc immediately "
"after receiving that many bytes\n");
exit(1);
}
int main(int argc, char **argv) {
int error = 0;
char *modbus_cmd = NULL;
size_t cmd_len = 0;
int expected = 0;
uint32_t timeout = 0;
verbose = 0;
rackmond_command *cmd = NULL;
char *response = NULL;
int clisock;
uint16_t response_len_actual;
struct sockaddr_un rackmond_addr;
int opt;
while((opt = getopt(argc, argv, "w:x:t:g:v")) != -1) {
switch (opt) {
case 'x':
expected = atoi(optarg);
break;
case 't':
timeout = atol(optarg);
break;
case 'v':
verbose = 1;
break;
default:
usage();
break;
}
}
if(optind < argc) {
modbus_cmd = argv[optind];
}
if(modbus_cmd == NULL) {
usage();
}
//convert hex to bytes
cmd_len = strlen(modbus_cmd);
if(cmd_len < 4) {
fprintf(stderr, "Modbus command too short!\n");
exit(1);
}
decode_hex_in_place(modbus_cmd, &cmd_len);
cmd = malloc(sizeof(rackmond_command) + cmd_len);
cmd->type = COMMAND_TYPE_RAW_MODBUS;
cmd->raw_modbus.length = cmd_len;
cmd->raw_modbus.custom_timeout = timeout;
memcpy(cmd->raw_modbus.data, modbus_cmd, cmd_len);
cmd->raw_modbus.expected_response_length = expected;
response = malloc(expected ? expected : 1024);
uint16_t wire_cmd_len = sizeof(rackmond_command) + cmd_len;
clisock = socket(AF_UNIX, SOCK_STREAM, 0);
CHECKP(socket, clisock);
rackmond_addr.sun_family = AF_UNIX;
strcpy(rackmond_addr.sun_path, "/var/run/rackmond.sock");
int addr_len = strlen(rackmond_addr.sun_path) + sizeof(rackmond_addr.sun_family);
CHECKP(connect, connect(clisock, (struct sockaddr*) &rackmond_addr, addr_len));
CHECKP(send, send(clisock, &wire_cmd_len, sizeof(wire_cmd_len), 0));
CHECKP(send, send(clisock, cmd, wire_cmd_len, 0));
CHECKP(recv, recv(clisock, &response_len_actual, sizeof(response_len_actual), 0));
if(response_len_actual == 0) {
uint16_t errcode = 0;
CHECKP(recv, recv(clisock, &errcode, sizeof(errcode), 0));
fprintf(stderr, "modbus error: %d (%s)\n", errcode, modbus_strerror(errcode));
error = 1;
goto cleanup;
}
CHECKP(recv, recv(clisock, response, response_len_actual, 0));
if(error == 0) {
printf("Response: ");
print_hex(stdout, response, response_len_actual);
printf("\n");
}
cleanup:
free(cmd);
free(response);
if(error != 0) {
if(errno != 0) {
fprintf(stderr, "errno err: %s\n", strerror(errno));
}
error = 1;
}
return error;
}
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