inital commit

build.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+gcc main.c -lasound -o devicewatchdog

main.c

@@ -0,0 +1,128 @@
+#include <stdio.h>
+#include <alsa/asoundlib.h>
+#include <alsa/control.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <ifaddrs.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define REBOOT_FILE "/var/cache/wdreboot"
+
+void free_str_array(char** array)
+{
+	for(size_t i = 0; array[i]; ++i)
+		free(array[i]);
+
+	free(array);
+}
+
+char** get_alsa_card_names(void)
+{
+	size_t array_len = 4;
+	char **array = (char**)malloc(array_len*sizeof(*array));
+
+	int card = -1;
+	size_t index = 0;
+	while(true)
+	{
+		int ret = snd_card_next(&card);
+		if(ret < 0 || card < 0)
+			break;
+
+		if(index >= array_len-1)
+		{
+			array_len = array_len*2;
+			array = realloc(array, array_len*sizeof(*array));
+		}
+
+		char *name = NULL;
+		ret = snd_card_get_name(card, &name);
+		if(ret < 0 || !name)
+			break;
+
+		array[index] = name;
+		++index;
+	}
+
+	array[index] = NULL;
+
+	return array;
+}
+
+bool reboot_file_exists(void)
+{
+	struct stat buf;
+	int ret = stat(REBOOT_FILE, &buf);
+	return ret == 0;
+}
+
+void reboot_system(bool dry_run)
+{
+	if(reboot_file_exists())
+	{
+		puts("Not rebooting as a reboot was executed before");
+		return;
+	}
+
+	int fd = open(REBOOT_FILE, O_WRONLY | O_CREAT);
+	close(fd);
+
+	if(!dry_run)
+			system("systemctl reboot");
+}
+
+
+int main(int argc, char** argv)
+{
+	bool dry_run = false;
+	if(argc > 1)
+	{
+		dry_run = true;
+		puts("dry run only");
+	}
+
+	char** card_array = get_alsa_card_names();
+	bool found_cfx = false;
+	for(size_t i = 0; card_array[i]; ++i)
+	{
+		printf("Card %zu: %s\n", i, card_array[i]);
+	}
+	free_str_array(card_array);
+
+	struct ifaddrs* ifap_list;
+	int ret = getifaddrs(&ifap_list);
+	if(ret < 0)
+	{
+		fprintf(stderr, "Unable to read network interfaces: %s", strerror(errno));
+		return 0;
+	}
+
+	size_t ifcount = 0;
+	for(struct ifaddrs* ifap = ifap_list; ifap; ifap = ifap->ifa_next)
+	{
+		printf("If: %s\n", ifap->ifa_name);
+		++ifcount;
+	}
+	printf("If count: %zu\n", ifcount);
+	freeifaddrs(ifap_list);
+
+	if(!found_cfx)
+	{
+		puts("Executeing shutdown because crateive xifi soundcard was not found");
+		reboot_system(dry_run);
+	}
+	else if(ifcount < 6)
+	{
+		puts("Executeing shutdown because not all network interfaces are avialable");
+		reboot_system(dry_run);
+	}
+	else
+	{
+		puts("System is all good");
+		remove(REBOOT_FILE);
+	}
+
+	return 0;
+}