Unless `file` is wrapped with buffered reader, `fmt.Fscanf` will read
just one byte and terminate with `EOF`.
Signed-off-by: Michal Minar <miminar@redhat.com>
Read `/proc/sys/net/ipv4/ip_local_port_range` kernel parameter to obtain
ephemeral port range that now sets the boundaries of port allocator
which finds free host ports for those exported by containers.
Signed-off-by: Michal Minar <miminar@redhat.com>
Fixed the following errors:
1. Request(0) causes a dead loop when the map is full and map.last == BEGIN.
2. When map.last is the only available port (or ip), Request(0) returns ErrAllPortsAllocated (or ErrNoAvailableIPs). Exception is when map.last == BEGIN.
Signed-off-by: shuai-z <zs.broccoli@gmail.com>
If we first request port 49153 (BeginPortRange) explicitly, and later some time request the next free port (of same ip/proto) by calling RequestPort() with port number 0, we will again get 49153 returned, even if it's currently in use. Because findPort() blindly retured BeginPortRange the first run, without checking if it has already been taken.
Signed-off-by: shuai-z <zs.broccoli@gmail.com>
