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Subject: Re: [libssh2] Blocking read returns PACKET_EAGAIN if not enough data is available?

Re: [libssh2] Blocking read returns PACKET_EAGAIN if not enough data is available?

From: Eberhard Mattes <em-libssh2_at_online.ms>
Date: Tue, 08 May 2007 14:27:20 +0200

Setting

   blocksize = 5;

in libssh2_packet_read() is not correct if multiple calls of
libssh2_packet_read() are required to read a complete unencrypted packet.

Suppose a packet of length 22 arrives in two parts of 20 and 2 bytes,
respectively. (Ie, the first recv() call will return 20, the second one will
return 2.) The first call to libssh2_packet_read() will consume the first 20
bytes, the next call to libssh2_packet_read() will return PACKET_EAGAIN as it
receives 2 instead of 5 bytes, and all further calls will return PACKET_EAGAIN
(or block) as they will receive no data at all.

Eberhard

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Received on 2007-05-08

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