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/* assuan-logging.c - Default logging function.
* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
*
* This file is part of Assuan.
*
* Assuan is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Assuan is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#ifdef HAVE_W32_SYSTEM
#include <windows.h>
#endif /*HAVE_W32_SYSTEM*/
#include <errno.h>
#include <ctype.h>
#include "assuan-defs.h"
static char prefix_buffer[80];
static FILE *_assuan_log;
static int full_logging;
void
_assuan_set_default_log_stream (FILE *fp)
{
if (!_assuan_log)
{
_assuan_log = fp;
full_logging = !!getenv ("ASSUAN_FULL_LOGGING");
}
}
void
assuan_set_assuan_log_stream (FILE *fp)
{
_assuan_log = fp;
}
/* Set the per context log stream. Also enable the default log stream
if it has not been set. */
void
assuan_set_log_stream (assuan_context_t ctx, FILE *fp)
{
if (ctx)
{
if (ctx->log_fp)
fflush (ctx->log_fp);
ctx->log_fp = fp;
_assuan_set_default_log_stream (fp);
}
}
FILE *
assuan_get_assuan_log_stream (void)
{
return _assuan_log ? _assuan_log : stderr;
}
/* Set the prefix to be used for logging to TEXT or
resets it to the default if TEXT is NULL. */
void
assuan_set_assuan_log_prefix (const char *text)
{
if (text)
{
strncpy (prefix_buffer, text, sizeof (prefix_buffer)-1);
prefix_buffer[sizeof (prefix_buffer)-1] = 0;
}
else
*prefix_buffer = 0;
}
const char *
assuan_get_assuan_log_prefix (void)
{
return prefix_buffer;
}
void
_assuan_log_printf (const char *format, ...)
{
va_list arg_ptr;
FILE *fp;
const char *prf;
int save_errno = errno;
fp = assuan_get_assuan_log_stream ();
prf = assuan_get_assuan_log_prefix ();
if (*prf)
fprintf (fp, "%s[%u]: ", prf, (unsigned int)getpid ());
va_start (arg_ptr, format);
vfprintf (fp, format, arg_ptr );
va_end (arg_ptr);
errno = save_errno;
}
/* Dump a possibly binary string (used for debugging). Distinguish
ascii text from binary and print it accordingly. This function
takes FILE pointer arg becuase logging may be enabled on a per
context basis. */
void
_assuan_log_print_buffer (FILE *fp, const void *buffer, size_t length)
{
const unsigned char *s;
int n;
for (n=length,s=buffer; n; n--, s++)
if ((!isascii (*s) || iscntrl (*s) || !isprint (*s)) && !(*s >= 0x80))
break;
s = buffer;
if (!n && *s != '[')
fwrite (buffer, length, 1, fp);
else
{
#ifdef HAVE_FLOCKFILE
flockfile (fp);
#endif
putc_unlocked ('[', fp);
if ( length > 16 && !full_logging)
{
for (n=0; n < 12; n++, s++)
fprintf (fp, " %02x", *s);
fprintf (fp, " ...(%d bytes skipped)", (int)length - 12);
}
else
{
for (n=0; n < length; n++, s++)
fprintf (fp, " %02x", *s);
}
putc_unlocked (' ', fp);
putc_unlocked (']', fp);
#ifdef HAVE_FUNLOCKFILE
funlockfile (fp);
#endif
}
}
/* Log a user supplied string. Escapes non-printable before
printing. */
void
_assuan_log_sanitized_string (const char *string)
{
const unsigned char *s = (const unsigned char *) string;
FILE *fp = assuan_get_assuan_log_stream ();
if (! *s)
return;
#ifdef HAVE_FLOCKFILE
flockfile (fp);
#endif
for (; *s; s++)
{
int c = 0;
switch (*s)
{
case '\r':
c = 'r';
break;
case '\n':
c = 'n';
break;
case '\f':
c = 'f';
break;
case '\v':
c = 'v';
break;
case '\b':
c = 'b';
break;
default:
if ((isascii (*s) && isprint (*s)) || (*s >= 0x80))
putc_unlocked (*s, fp);
else
{
putc_unlocked ('\\', fp);
fprintf (fp, "x%02x", *s);
}
}
if (c)
{
putc_unlocked ('\\', fp);
putc_unlocked (c, fp);
}
}
#ifdef HAVE_FUNLOCKFILE
funlockfile (fp);
#endif
}
#ifdef HAVE_W32_SYSTEM
const char *
_assuan_w32_strerror (int ec)
{
static char strerr[256];
if (ec == -1)
ec = (int)GetLastError ();
FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM, NULL, ec,
MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
strerr, sizeof (strerr)-1, NULL);
return strerr;
}
#endif /*HAVE_W32_SYSTEM*/
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