I think that the stream that it writes to is platform specific.
The default implementation for ui_write_string is in ui_openssl.c:
static int write_string(UI *ui, UI_STRING *uis)
{
switch (UI_get_string_type(uis))
{
case UIT_ERROR:
case UIT_INFO:
fputs(UI_get0_output_string(uis), tty_out);
fflush(tty_out);
break;
default:
break;
}
return 1;
}
This writes to "tty_out". This is set in open_console, also in ui_openssl.c:
#if defined(OPENSSL_SYS_MACINTOSH_CLASSIC) ||
defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE) ||
defined(OPENSSL_SYS_BEOS)
tty_in=stdin;
tty_out=stderr;
#else
# ifdef OPENSSL_SYS_MSDOS
# define DEV_TTY "con"
# else
# define DEV_TTY "/dev/tty"
# endif
if ((tty_in=fopen(DEV_TTY,"r")) == NULL)
tty_in=stdin;
if ((tty_out=fopen(DEV_TTY,"w")) == NULL)
tty_out=stderr;
So depending on your platform it will be one of stderr, con or /dev/tty.
Since you said you've attempted to redirect the output for stdout and
stderr already, I'm guessing that for you it is writing direct to /dev/tty.
Hope that helps.
Matt
On 26/01/12 22:29, Robert O'Hearne wrote:
I am using a Java program to call a Perl script which calls curl to upload a file to a
FTPS server. The FTPS server has a certificate which requires a pass phrase. My Java
program reads from standard error looking for the "Enter PEM pass phrase:"
prompt so I can then write the pass phrase to stdin.
The problem is the "Enter PEM pass phrase:" prompt is not present in standard error or
standard out. For example: from the Linux (Red Hat Enterprise 5.1) bash shell prompt, I call curl
and redirect standard error and standard output to files. The "Enter PEM pass phrase:"
prompt still appears at the console, and is not present in either of the redirect files.
I am trying to understand how OpenSSL writes this prompt, especially to what stream
it writes it. I believe curl is calling SSL_CTX_use_certificate_chain_file which
issues the prompt, but I am not certain about that. I do see the prompt in pem_lib.c
method PEM_def_callback. The prompt is written in ui_lib.c method UI_process, in the
call ui->meth->ui_write_string. At this point I don't understand what happens.
I am not a C programmer.
My ultimate problem is how to capture the "Enter PEM pass phrase:" prompt from a Java
program as described above. But my question for this list is, please explain how the "Enter
PEM pass phrase:" prompt is written, including where is the code which actually writes.
Thanks
Robert O'Hearne
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OpenSSL Project http://www.openssl.org
User Support Mailing List openssl-users@openssl.org
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______________________________________________________________________
OpenSSL Project http://www.openssl.org
User Support Mailing List openssl-users@openssl.org
Automated List Manager majord...@openssl.org
