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ssh: log the libssh2 error message when ssh session startup fails

When a ssh session startup fails, it is useful to know why it has
failed. This commit changes the message from:
   "Failure establishing ssh session"
to something like this, for example:
   "Failure establishing ssh session: -5, Unable to exchange encryption keys"

Closes #3481
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JDepooter authored and bagder committed Jan 17, 2019
1 parent 7c16871 commit b095a1ca63ab4962e7256616ff02607c5a77e089
Showing with 4 additions and 1 deletion.
  1. +4 −1 lib/ssh.c
@@ -667,7 +667,10 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
if(rc) {
failf(data, "Failure establishing ssh session");
char *err_msg = NULL;
(void)libssh2_session_last_error(sshc->ssh_session, &err_msg, NULL, 0);
failf(data, "Failure establishing ssh session: %d, %s", rc, err_msg);

state(conn, SSH_SESSION_FREE);
sshc->actualcode = CURLE_FAILED_INIT;

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