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info.cpp
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info.cpp
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/*
* Copyright (c) 2022 by Thomas A. Early N7TAE
*
* 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 <ctype.h>
#include <iostream>
#include <iomanip>
#include <cstring>
#include <cstdint>
#include <poll.h>
#include "ip.h"
#include "udpsocket.h"
#include "callsign.h"
static void Dump(const char *title, const void *pointer, int length)
{
const unsigned char *data = (const unsigned char *)pointer;
std::cout << title << std::endl;
unsigned int offset = 0U;
while (length > 0) {
unsigned int bytes = (length > 16) ? 16U : length;
for (unsigned i = 0U; i < bytes; i++) {
if (i)
std::cout << " ";
std::cout << std::hex << std::setw(2) << std::right << std::setfill('0') << int(data[offset + i]) << std::dec;
}
for (unsigned int i = bytes; i < 16U; i++)
std::cout << " ";
std::cout << " *";
for (unsigned i = 0U; i < bytes; i++) {
unsigned char c = data[offset + i];
if (::isprint(c))
std::cout << c;
else
std::cout << '.';
}
std::cout << '*' << std::endl;
offset += 16U;
if (length >= 16)
length -= 16;
else
length = 0;
}
}
struct SHost
{
SHost(std::string u, std::string ip4, std::string ip6, std::string p) : url(u), ip4addr(ip4), ip6addr(ip6), port(std::stoul(p)) {}
std::string url, ip4addr, ip6addr;
uint16_t port;
};
int main(int argc, char *argv[])
{
if (argc < 3 || argc > 4)
{
std::cout << "usage: " << argv[0] << "IpAddress port <module>" << std::endl;
return EXIT_FAILURE;
}
unsigned port = std::stoul(argv[2]);
if (1024 > port || port > 49000)
{
std::cerr << "port value " << port << " is out of range" << std::endl;
return EXIT_FAILURE;
}
CIp bindaddr, toaddr(argv[1], AF_UNSPEC, SOCK_DGRAM, port);
bindaddr.Initialize(toaddr.GetFamily(), port, "any");
if (! bindaddr.IsSet() || ! toaddr.IsSet())
{
std::cerr << "Trouble with setting the binding addresses" << bindaddr << " and " << toaddr << std::endl;
std::cerr << "Family is " << toaddr.GetFamily() << std::endl;
return EXIT_FAILURE;
}
char mod;
if (3 == argc)
{
mod = ' ';
}
else
{
mod = argv[3][0];
if ('a'<=mod && mod<='z')
mod = mod - 'a' + 'A';
if ('A'>mod || mod>'Z')
{
std::cerr << "The optional module must be a letter and not '" << mod << "'" << std::endl;
return EXIT_FAILURE;
}
}
CUdpSocket usock;
if (! usock.Open(bindaddr))
return EXIT_FAILURE;
struct pollfd pfd;
pfd.fd = usock.GetSocket();
pfd.events = POLLIN;
pfd.revents = 0;
uint8_t buf[UDP_BUFFER_LENMAX];
memcpy(buf, "INFO", 4);
buf[4] = mod;
usock.Send(buf, 5, toaddr);
auto rv = poll(&pfd, 1, 5000);
if (rv < 0)
{
perror("poll");
return EXIT_FAILURE;
}
if (rv == 0)
{
std::cerr << "No response from " << toaddr << std::endl;
return EXIT_FAILURE;
}
CIp fromaddr;
auto n = usock.ReceiveFrom(buf, fromaddr);
if (n < 0)
{
perror("recvfrom");
return EXIT_FAILURE;
}
if (n == 0)
{
std::cerr << "Received zero bytes from " << fromaddr << std::endl;
return EXIT_FAILURE;
}
usock.Close();
if (memcmp(buf, "INFO", 4))
{
Dump("Unknown packet received:", buf, n);
return EXIT_SUCCESS;
}
if (' ' == mod)
{
std::cout << "Received from " << fromaddr << " for reflector:" << std::endl;
if (11 == n)
{
unsigned count = buf[4] * 0x100u + buf[5];
std::cout << count << " client" << ((1==count) ? "" : "s") << std::endl;
std::time_t t = 0;
for (unsigned i=6; i<11; i++)
t = t * 0x100u + buf[i];
std::cout << "Global last-heard time: ";
if (t)
{
char s[100];
if (std::strftime(s, sizeof(s), "%F %T local time", std::localtime(&t)))
std::cout << s << std::endl;
else
std::cout << "Unknow time: " << int64_t(t) << std::endl;
}
else
std::cout << "nothing heard" << std::endl;
}
else
{
Dump("Unexpected response:", buf, n);
return EXIT_FAILURE;
}
}
else
{
std::cout << "Received from " << fromaddr << " for module " << mod << ":" << std::endl;
if (5 == n && 0==memcmp(buf, "INFO?", 5))
{
std::cout << "Module is not configured." << std::endl;
return EXIT_SUCCESS;
}
else if (18 == n)
{
unsigned count = buf[4] * 0x100u + buf[5];
std::cout << count << " client" << ((1==count) ? "" : "s") << std::endl;
std::cout << "This module is " << (bool(buf[6]) ? "" : "not ") << "encrypted" << std::endl;
std::time_t t = 0;
for (unsigned i=13; i<18; i++)
t = t * 0x100u + buf[i];
std::cout << "Last-heard: ";
if (t)
{
CCallsign cs(buf+7);
std::cout << cs << " at ";
char s[100];
if (std::strftime(s, sizeof(s), "%F %T local time", std::localtime(&t)))
std::cout << s << std::endl;
else
std::cout << "Unknown time: " << int64_t(t) << std::endl;
}
else
std::cout << "nothing heard" << std::endl;
}
else
{
Dump("Unexpected response:", buf, n);
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}