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Request a small MSS in web connection explicitly

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Sometimes equipment will not handle some header data, such as 802.1q tag.  Other times,
there's a jumbo NIC talking to a BMC that is not jumbo.

Workaround such situations by setting the MSS to 1456 explicitly, which fits in MTU 1500 plus
4 bytes for dot1q tag, if some intermediat device fails to handle that.

Change-Id: I7db1c8feac1c094871723026771792432a3daaf4
This commit is contained in:
Jarrod Johnson 2017-08-01 15:04:17 -04:00
parent 2d517cf113
commit 19ae81f1dc
1 changed files with 7 additions and 1 deletions
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8
pyghmi/util/webclient.py
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@ -81,7 +81,13 @@ class SecureHTTPConnection(httplib.HTTPConnection, object):
self.stdheaders[key] = value
def connect(self):
plainsock = socket.create_connection((self.host, self.port), 60)
addrinfo = socket.getaddrinfo(self.host, self.port)[0]
# workaround problems of too large mtu, moderately frequent occurance
# in this space
plainsock = socket.socket(addrinfo[0])
plainsock.settimeout(60)
plainsock.setsockopt(socket.IPPROTO_TCP, socket.TCP_MAXSEG, 1456)
plainsock.connect(addrinfo[4])
self.sock = ssl.wrap_socket(plainsock, cert_reqs=self.cert_reqs)
# txtcert = self.sock.getpeercert() # currently not possible
bincert = self.sock.getpeercert(binary_form=True)