Hello all, I've just started working with libssh2 and I've run into a problem that I've seen some other folks describe, but to which I haven't yet seen a good solution. If someone can shed some light on this I would appreciate it.
If I connect to a remote host with libssh2, the call to libssh2_session_startup returns successfully (return code == 0). However, inspecting the internal data structures at this point shows: session->err_msg = "Unable to exchange encryption keys" session->err_code = -37, After this point, the hostkey returned by libssh2_session_hostkey() is empty (not NULL, but the empty string). The relevant internal fields look like this: session->server_hostkey = "" session->server_hostkey_len = 277 session->server_hostkey_md5 = "\274\233\026\"\362\f\220E\237\002p\267\262\360\253\a" session->server_hostkey_sha1 = "\346\024\"5\202\350\020\210Q\252\262\240\340b\363\344\303\373\231l" As far as the server was concerned, everything worked fine. The debug output from sshd looks like this: Connection from 127.0.0.1 port 34505 debug1: Client protocol version 2.0; client software version libssh2_1.2.7-20100617 debug1: no match: libssh2_1.2.7-20100617 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.3 debug1: permanently_set_uid: 74/74 debug1: list_hostkey_types: ssh-rsa,ssh-dss debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: client->server aes128-ctr hmac-sha1 none debug1: kex: server->client aes128-ctr hmac-sha1 none debug1: expecting SSH2_MSG_KEXDH_INIT debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: KEX done If I try the same connection with either vanilla OpenSSH or with Paramiko, it works just fine. I'm using yesterday's snapshot (20100617). I encountered the same problem with 1.2.4. You can see the actual code here (which started life as examples/direct_tcpip.c from libssh2): http://gist.github.com/443651 Thanks for your help, -- Lars _______________________________________________ libssh2-devel http://cool.haxx.se/cgi-bin/mailman/listinfo/libssh2-devel
