char *host_key_alias; /* hostname alias for .ssh/known_hosts */
char *proxy_command; /* Proxy command for connecting the host. */
char *user; /* User to log in as. */
+ int implicit; /* Login user was not specified.
+ Server may choose based on authctxt. */
int escape_char; /* Escape character; -2 = none */
char *system_hostfile;/* Path for /etc/ssh/ssh_known_hosts. */