Oh, I see, the key is not a string, it contains binary data and (usually) starts with a zero byte :-).
On Wednesday 9. February 2022, 11:30:15 (+01:00), Jente Hidskes wrote: > Hi Ján, > > Thanks for your reply! I quickly tested with libssh2_session_startup > but it makes no difference unfortunately. It's good to know what I > need is possible with libssh2, though! > > I did find that if I retrieve the length of the key, I get 279 (and > the key type is PLAIN). Yet printing it still returns the empty > string. > To show what I mean, here's the output of my code: > > $ ./sftp 10.241.167.53 22 user pass > Fingerprint: 28 75 36 2E B2 8B E8 8D 87 63 28 9F 42 0E D1 6F 2D 8B 38 EE > Host key: "" > Host key type: 1 > Host key length: 279 > all done > > I uploaded my example code here[1], in case it helps. I am using libssh2 > 1.10.0. > > Thanks, > > Jente > > [1] https://gist.github.com/Hjdskes/898cd7389b447f75c9ca0798097ac436 > > Jente Hidskes > > Engineer > > Nordic Payment Networks > > +46728558908 > > Klarna Bank AB (publ) > > Sveavägen 46, 111 34 Stockholm > > Tel: +46 8 120 120 00 > > Reg no: 556737-0431 > > klarna.com > > > > > On Wed, Feb 9, 2022 at 11:12 AM Ján Osuský <jan.osu...@iblsoft.com> wrote: > > > > Hi Jente, > > > > we use libssh2 for a client implementation too and we use both the > > fingerprint (with libssh2_hostkey_hash) and the host key itself. > > > > Function "libssh2_session_hostkey" returns pointer to the key as expected, > > and also sets the key length and type. > > > > In our code (that is not new anymore) we still use libssh2_session_startup > > instead of libssh2_session_handshake but I don't think that should be a > > problem. > > > > > > Best regards, > > > > > > JanO > > > > > > > > On Wednesday 9. February 2022, 10:17:05 (+01:00), Jente Hidskes via > > libssh2-devel wrote: > > > > > Hey folks, > > > > > > I am working on a small SFTP client using libssh2. I would like for > > > this client to persist the host key of the server it is connecting to, > > > but I seem to be unable to get a hold of it. > > > > > > After initialising libssh2 and calling libssh2_session_handshake, I am > > > able to print the host key fingerprint through libssh2_hostkey_hash as > > > in the example programs. I assumed I would be able to print the actual > > > host key rather than the fingerprint with libssh2_session_hostkey, but > > > that returns an empty string. > > > > > > I suspect that libssh2_session_hostkey only returns the local host key > > > when operating as a server (given this[1] source code comment), but > > > the docs[2] are unclear about this: they just state "get the remote > > > key" and "returns a pointer to the current host key". > > > > > > Am I doing something wrong, or is it indeed impossible right now to > > > print the host key when operating as a client? > > > > > > Kind regards, > > > > > > Jente > > > > > > [1] > > > https://github.com/libssh2/libssh2/blob/2a2aaed3b6c3c1dc25e35e11afcfb23f88a18510/src/libssh2_priv.h#L628 > > > [2] https://www.libssh2.org/libssh2_session_hostkey.html > > > -- Ján Osuský (jan.osu...@iblsoft.com) IBL Software Engineering, http://www.iblsoft.com/ Galvaniho 17/C, 82104 Bratislava, Slovakia Phone: +421-2-32662111, Fax: +421-2-32662110 -- libssh2-devel mailing list libssh2-devel@lists.haxx.se https://lists.haxx.se/listinfo/libssh2-devel
