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author | Mikio Hara <mikioh.mikioh@gmail.com> | 2016-12-15 06:19:49 +0900 |
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committer | Brad Fitzpatrick <bradfitz@golang.org> | 2017-07-06 14:02:46 +0000 |
commit | bb3be403e79731b208c41bd170a6a87642d988da (patch) | |
tree | 0d815e7b3c71b3ea578df96a1d84a2ddeb8ebfb2 /src/net/lookup.go | |
parent | a5179bd0a56d8fae91e860f585cef143ce5ec89b (diff) | |
download | go-bb3be403e79731b208c41bd170a6a87642d988da.tar.gz go-bb3be403e79731b208c41bd170a6a87642d988da.zip |
net: clarify the length limit for service name
Change-Id: If5495f66d175bdacebd599abf1e064d2343669c2
Reviewed-on: https://go-review.googlesource.com/34430
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Diffstat (limited to 'src/net/lookup.go')
-rw-r--r-- | src/net/lookup.go | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/net/lookup.go b/src/net/lookup.go index c05731ffb3..c9f327050a 100644 --- a/src/net/lookup.go +++ b/src/net/lookup.go @@ -28,6 +28,9 @@ var protocols = map[string]int{ // services contains minimal mappings between services names and port // numbers for platforms that don't have a complete list of port numbers // (some Solaris distros, nacl, etc). +// +// See https://www.iana.org/assignments/service-names-port-numbers +// // On Unix, this map is augmented by readServices via goLookupPort. var services = map[string]map[string]int{ "udp": { @@ -63,7 +66,12 @@ func lookupProtocolMap(name string) (int, error) { return proto, nil } -const maxServiceLength = len("mobility-header") + 10 // with room to grow +// maxPortBufSize is the longest reasonable name of a service +// (non-numeric port). +// Currently the longest known IANA-unregistered name is +// "mobility-header", so we use that length, plus some slop in case +// something longer is added in the future. +const maxPortBufSize = len("mobility-header") + 10 func lookupPortMap(network, service string) (port int, error error) { switch network { @@ -74,7 +82,7 @@ func lookupPortMap(network, service string) (port int, error error) { } if m, ok := services[network]; ok { - var lowerService [maxServiceLength]byte + var lowerService [maxPortBufSize]byte n := copy(lowerService[:], service) lowerASCIIBytes(lowerService[:n]) if port, ok := m[string(lowerService[:n])]; ok && n == len(service) { |