GT4

• GridFtp server program would better be runned in root account, otherwise it is easy get host-based auth. problem (like user account doesn't match /host/bleu)

• To use the C api of gridftp, we have to install the GT4 from source tree; the binary package will not include the requried module to support globus_makefile_header, to generate the necessary header files for the gridfty by
  globus_makefile_header -favor==gcc32dbg globus_ftp_client

• you can tell which default CA you are using by running grid-default-ca you can tell which CA in the cert by running grid-cert-info, which will give the DN, and by the DN you can file the CA name (digest) then cp it to the directory which is default to be /ect/grid-security/certificates. if you don't have priviledge to write, to specify a different location where the grid security configuration files were installed, set the X509_CERT_DIR set the GRID_SECURITY_DIR environment variables.