Habitat-lora-gateway/network.c

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <stdio.h>   	// Standard input/output definitions
#include <string.h>  	// String function definitions
#include <unistd.h>  	// UNIX standard function definitions
#include <fcntl.h>   	// File control definitions
#include <errno.h>   	// Error number definitions
#include <termios.h> 	// POSIX terminal control definitions
#include <stdint.h>
#include <stdlib.h>
#include <dirent.h>
#include <math.h>
#include <pthread.h>
#include <ifaddrs.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "network.h"
#include "global.h"

int HaveAnIPAddress(void)
{
    struct ifaddrs *ifap, *ifa;
    struct sockaddr_in *sa;
    char *addr;
	int FoundAddress;

	FoundAddress = 0;
	
    if (getifaddrs(&ifap) == 0)
	{
		// Success
		for (ifa = ifap; ifa; ifa = ifa->ifa_next)
		{
			if (ifa->ifa_addr != NULL)
			{
				// Family is known (which it isn't for a VPN)
				if (ifa->ifa_addr->sa_family==AF_INET)
				{
					sa = (struct sockaddr_in *) ifa->ifa_addr;
					addr = inet_ntoa(sa->sin_addr);
					if (strcmp(addr, "127.0.0.1") != 0)
					{
						FoundAddress = 1;
					}
				}
			}
        }
    }

    freeifaddrs(ifap);
	
	return FoundAddress;
}

int CanSeeTheInternet(void)
{
	struct addrinfo hints, *res, *p;
	int status, sockfd, FoundInternet;
	
	memset(&hints, 0, sizeof hints);
	hints.ai_family = AF_UNSPEC; // AF_INET or AF_INET6 to force version
	hints.ai_socktype = SOCK_STREAM;

	if ((status = getaddrinfo("google.com", "80", &hints, &res)) != 0)
	{
		return 0;
	}

	sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);

	FoundInternet = 1;
	if(connect(sockfd, res->ai_addr, res->ai_addrlen) == -1)
	{
		FoundInternet = 0;
	}

	close(sockfd);

	freeaddrinfo(res); // free the linked list

	return FoundInternet;
}

void *NetworkLoop(void *some_void_ptr)
{
    while (1)
    {
		digitalWrite(Config.NetworkLED, 0);
		digitalWrite(Config.InternetLED, 0);
		if (HaveAnIPAddress())
		{
			digitalWrite(Config.NetworkLED, 1);
//			LogMessage("On network :-)\n");
			
			if (CanSeeTheInternet())
			{
				digitalWrite(Config.InternetLED, 1);
//				LogMessage("On the internet :-)\n");
			}
			else
			{
//				LogMessage("Not on internet :-(\n");
			}
		}
		else
		{
//			LogMessage("No network :-(\n");
		}
		
		sleep(5);
	}
}