LocalIP: cache default route value

src/common/netif/netif.c

@@ -0,0 +1,35 @@
+#include "netif.h"
+
+#ifndef _WIN32
+#include <net/if.h>
+
+bool ffNetifGetDefaultRouteImpl(char iface[IF_NAMESIZE + 1]);
+
+const char* ffNetifGetDefaultRoute()
+{
+    static char iface[IF_NAMESIZE + 1];
+
+    if (*(uint16_t*) iface == 0)
+    {
+        if (!ffNetifGetDefaultRouteImpl(iface))
+            iface[1] = 1;
+    }
+
+    return iface;
+}
+#else
+bool ffNetifGetDefaultRouteImpl(uint32_t* ifIndex);
+
+uint32_t ffNetifGetDefaultRoute()
+{
+    static uint32_t ifIndex = (uint32_t) -1;
+
+    if (ifIndex == (uint32_t) -1)
+    {
+        if (!ffNetifGetDefaultRouteImpl(&ifIndex))
+            ifIndex = (uint32_t) -2;
+    }
+
+    return ifIndex;
+}
+#endif

src/common/netif/netif.h

@@ -3,7 +3,7 @@
 #include "fastfetch.h"
 
 #ifndef _WIN32
-bool ffNetifGetDefaultRoute(FFstrbuf* iface);
+const char* ffNetifGetDefaultRoute();
 #else
-bool ffNetifGetDefaultRoute(uint32_t* ifIndex);
+uint32_t ffNetifGetDefaultRoute();
 #endif

src/common/netif/netif_bsd.c

@@ -2,6 +2,7 @@
 
 #include "common/io/io.h"
 
+#include <net/if.h>
 #include <net/if_dl.h>
 #include <net/route.h>
 #include <netinet/in.h>
@@ -38,9 +39,7 @@ get_rt_address(struct rt_msghdr *rtm, int desired)
     return NULL;
 }
 
-
-
-bool ffNetifGetDefaultRoute(FFstrbuf* iface)
+bool ffNetifGetDefaultRouteImpl(char iface[IF_NAMESIZE + 1])
 {
     //https://github.com/hashPirate/copenheimer-masscan-fork/blob/36f1ed9f7b751a7dccd5ed27874e2e703db7d481/src/rawsock-getif.c#L104
 
@@ -86,7 +85,9 @@ bool ffNetifGetDefaultRoute(FFstrbuf* iface)
             struct sockaddr_dl* sdl = (struct sockaddr_dl *)get_rt_address(&rtmsg.hdr, RTA_IFP);
             if (sdl)
             {
-                ffStrbufSetNS(iface, sdl->sdl_nlen, sdl->sdl_data);
+                assert(sdl->sdl_nlen <= IF_NAMESIZE);
+                memcpy(iface, sdl->sdl_data, sdl->sdl_nlen);
+                iface[sdl->sdl_nlen] = '\0';
                 return true;
             }
             return false;

src/common/netif/netif_linux.c

@@ -1,9 +1,13 @@
 #include "netif.h"
 #include "common/io/io.h"
 
+#include <net/if.h>
 #include <stdio.h>
 
-bool ffNetifGetDefaultRoute(FFstrbuf* iface)
+#define FF_STR_INDIR(x) #x
+#define FF_STR(x) FF_STR_INDIR(x)
+
+bool ffNetifGetDefaultRouteImpl(char iface[IF_NAMESIZE + 1])
 {
     FILE* FF_AUTO_CLOSE_FILE netRoute = fopen("/proc/net/route", "r");
     if (!netRoute) return false;
@@ -14,11 +18,9 @@ bool ffNetifGetDefaultRoute(FFstrbuf* iface)
     funlockfile(netRoute);
     unsigned long long destination; //, gateway, flags, refCount, use, metric, mask, mtu,
 
-    char buf[16 /*IF_NAMESIZE*/ + 1];
-    while (fscanf(netRoute, "%16s%llx%*[^\n]", buf, &destination) == 2)
+    while (fscanf(netRoute, "%" FF_STR(IF_NAMESIZE) "s%llx%*[^\n]", iface, &destination) == 2)
     {
         if (destination != 0) continue;
-        ffStrbufSetS(iface, buf);
         return true;
     }
     return false;

src/common/netif/netif_windows.c

@@ -3,7 +3,7 @@
 
 #include <iphlpapi.h>
 
-bool ffNetifGetDefaultRoute(uint32_t* ifIndex)
+bool ffNetifGetDefaultRouteImpl(uint32_t* ifIndex)
 {
     ULONG size = 0;
     if (GetIpForwardTable(NULL, &size, TRUE) != ERROR_INSUFFICIENT_BUFFER)