net autodetect

src/main.c

@@ -19,7 +19,6 @@
 
 static constexpr uint8_t  lcd_contrast        = 250;
 static constexpr uint16_t refresh_interval_ms = 1000;
-static constexpr char     netif[]             = "enp10s0";
 static constexpr char     cpu_pcidev[]        = "/sys/bus/pci/devices/0000:00:18.3";
 static constexpr char     gpu_pcidev[]        = "/sys/class/drm/renderD128/device";
 
@@ -52,7 +51,7 @@ static void *sensors_thread(void *arg) {
 	/* set up paths for the sensors */
 	strcpy(sensors->home.mountpoint, "/home/drath");
 	strcpy(sensors->gry.mountpoint, "/var/mnt/gry");
-	strcpy(sensors->net.device, netif);
+	// strcpy(sensors->net.device, netif);
 	cpu_detect(&sensors->cpu, cpu_pcidev);
 	gpu_detect(&sensors->gpu, gpu_pcidev);
 	sys_detect(&sensors->sys, "nct6775.656");

src/sys.c

@@ -2,6 +2,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/statvfs.h>
+#include <ifaddrs.h>
+#include <arpa/inet.h>
+#include <net/if.h>
 #include <time.h>
 
 #include "log.h"
@@ -91,7 +94,28 @@ void sys_get_network(struct network_t *network) {
 }
 
 void sys_netdev_detect(struct network_t *network) {
-	applog(LOG_INF, "Opening netdev %s", network->device);
+	struct ifaddrs *ifaddr;
+	getifaddrs(&ifaddr);
+	char addr[INET_ADDRSTRLEN];
+	for (const struct ifaddrs *ifa = ifaddr; ifa != nullptr; ifa = ifa->ifa_next) {
+		// ugliest fucking if
+		if (!ifa->ifa_addr ||
+			ifa->ifa_addr->sa_family != AF_INET ||
+			!(ifa->ifa_flags & IFF_UP) ||
+			!(ifa->ifa_flags & IFF_RUNNING) ||
+			ifa->ifa_flags & IFF_LOOPBACK)
+			continue;
+		
+		const struct sockaddr_in *sin = (struct sockaddr_in *)ifa->ifa_addr;
+		inet_ntop(AF_INET, &sin->sin_addr, addr, sizeof(addr));
+		if (strncmp("10.0.1.", addr, 7) == 0) {
+			strcpy(network->device, ifa->ifa_name);
+			break;
+		}
+	}
+	freeifaddrs(ifaddr);
+
+	applog(LOG_INF, "Detected %s with addr %s", network->device, addr);
 	static char path[128];
 	snprintf(path, sizeof(path), "/sys/class/net/%s/statistics/", network->device);
 	open_sensor(&network->f_rx, path, "rx_bytes", nullptr, 1, SENSOR_U64);