Re: [libvirt] Some questions about virConnectAuthCallbackPtr

On Sat, Oct 13, 2012 at 05:47:24PM +0100, Richard W.M. Jones wrote: > BTW I cannot get the libssh2 backend in libvirt to work. For > every host it says: > > libvirt_auth.c: authentication required for libvirt URI 'qemu+libssh2://localhost/system' > libvirt_auth.c: credential 'echoprompt' > Accept SSH host key with hash '<correct host key>' for host 'localhost:22' (y/n)?: y > libguestfs: error: could not connect to libvirt (code 85, domain 50): SSH transport error: SSH host key for 'localhost' (<correct host key>) was not accepted > > No idea what I'm doing wrong. Nothing in the logs on the server > indicate that anything is wrong on the remote side. Peter, This is because of a bug in the libvirt code: if (!askKey.result || STRCASENEQ(askKey.result, "y")) { virReportError(VIR_ERR_SSH, _("SSH host key for '%s' (%s) was not accepted"), sess->hostname, keyhash); VIR_FREE(keyhash); VIR_FREE(askKey.result); return -1; } The problem with this code is that it ignores the resultlen field. If the caller passes result[] = { 'y' } (no trailing \0), resultlen = 1, (which IMHO is a correct use of the API as described by the documentation), then STRCASENEQ above will not match the string. You need to use something like: askKey.resultlen >= 1 && askKey.result[0] == 'y' or else some sort of memcmp function.