vsftpd_1.2.1_twoprocess.c_vsf_two_process_start

source

twoprocess.c

line

61 - 92

概要

vsf_two_process_start(struct vsf_session* p_sess)

処理の流れ

• /* Create the comms channel between privileged parent and no-priv child */

    64   priv_sock_init(p_sess);
    65   vsf_sysutil_install_async_sighandler(kVSFSysUtilSigCHLD, handle_sigchld);
    66   {
    67     int newpid = vsf_sysutil_fork();
    68     if (newpid != 0)
    69     {
    70       /* Parent - go into pre-login parent process mode */
    71       while (1)
    72       {
    73         process_login_req(p_sess);
    74       }
    75     }
    76   }

• /* Child process - time to lose as much privilege as possible and do the login processing

    80   if (tunable_local_enable && tunable_userlist_enable)
    81   {
    82     int retval = str_fileread(&p_sess->userlist_str, tunable_userlist_file,
    83                               VSFTP_CONF_FILE_MAX);
    84     if (vsf_sysutil_retval_is_error(retval))
    85     {
    86       die2("cannot open user list file:", tunable_userlist_file);
    87     }
    88   }

    89   drop_all_privs();

• コネクション初期化

    90   init_connection(p_sess);

function

    61 vsf_two_process_start(struct vsf_session* p_sess)
    62 {
    63   /* Create the comms channel between privileged parent and no-priv child */
    64   priv_sock_init(p_sess);
    65   vsf_sysutil_install_async_sighandler(kVSFSysUtilSigCHLD, handle_sigchld);
    66   {
    67     int newpid = vsf_sysutil_fork();
    68     if (newpid != 0)
    69     {
    70       /* Parent - go into pre-login parent process mode */
    71       while (1)
    72       {
    73         process_login_req(p_sess);
    74       }
    75     }
    76   }
    77   /* Child process - time to lose as much privilege as possible and do the
    78    * login processing
    79    */
    80   if (tunable_local_enable && tunable_userlist_enable)
    81   {
    82     int retval = str_fileread(&p_sess->userlist_str, tunable_userlist_file,
    83                               VSFTP_CONF_FILE_MAX);
    84     if (vsf_sysutil_retval_is_error(retval))
    85     {
    86       die2("cannot open user list file:", tunable_userlist_file);
    87     }
    88   }
    89   drop_all_privs();
    90   init_connection(p_sess);
    91   /* NOTREACHED */
    92 }