1 files changed, 36 insertions, 0 deletions
diff --git a/src/common/impl/netif_gnu.c b/src/common/impl/netif_gnu.c
new file mode 100644
index 0000000..d2feed5
--- /dev/null
+++ b/src/common/impl/netif_gnu.c
@@ -0,0 +1,36 @@
+#include "common/netif.h"
+#include "common/io.h"
+
+#include <net/if.h>
+#include <stdio.h>
+
+#define FF_STR_INDIR(x) #x
+#define FF_STR(x) FF_STR_INDIR(x)
+
+bool ffNetifGetDefaultRouteImplV4(FFNetifDefaultRouteResult* result) {
+    FILE* FF_AUTO_CLOSE_FILE netRoute = fopen("/proc/route", "r");
+
+    if (!netRoute) {
+        return false;
+    }
+
+    // skip first line
+    FF_UNUSED(fscanf(netRoute, "%*[^\n]\n"));
+    unsigned long long destination; //, gateway, flags, refCount, use, metric, mask, mtu, ...
+    while (fscanf(netRoute, "%" FF_STR(IF_NAMESIZE) "s%llx%*[^\n]", result->ifName, &destination) == 2) {
+        if (destination != 0) {
+            continue;
+        }
+        result->ifIndex = if_nametoindex(result->ifName);
+        // TODO: Get the preferred source address
+        return true;
+    }
+    result->ifName[0] = '\0';
+    return false;
+}
+
+bool ffNetifGetDefaultRouteImplV6(FFNetifDefaultRouteResult* result) {
+    // TODO: AF_INET6
+    FF_UNUSED(result);
+    return false;
+}