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Linux: simplify ffNetifGetDefaultRouteImpl #1336

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Linux: simplify ffNetifGetDefaultRouteImpl #1336

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9 changes: 5 additions & 4 deletions src/common/netif/netif_linux.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6,18 +6,19 @@

#define FF_STR_INDIR(x) #x
#define FF_STR(x) FF_STR_INDIR(x)
// /proc/net/route has a fixed 128 chars line size, +1 for the NUL
#define NET_ROUTE_LINE_SIZE 129

bool ffNetifGetDefaultRouteImpl(char iface[IF_NAMESIZE + 1], uint32_t* ifIndex)
{
FILE* FF_AUTO_CLOSE_FILE netRoute = fopen("/proc/net/route", "r");
if (!netRoute) return false;

// skip first line
flockfile(netRoute);
while (getc_unlocked(netRoute) != '\n');
funlockfile(netRoute);
unsigned long long destination; //, gateway, flags, refCount, use, metric, mask, mtu,
char skippedLine[NET_ROUTE_LINE_SIZE];
if (!fgets(skippedLine, NET_ROUTE_LINE_SIZE, netRoute)) return false;

unsigned long long destination; //, gateway, flags, refCount, use, metric, mask, mtu,
while (fscanf(netRoute, "%" FF_STR(IF_NAMESIZE) "s%llx%*[^\n]", iface, &destination) == 2)
{
if (destination != 0) continue;
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