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author | Gergely Nagy <algernon@balabit.hu> | 2012-08-10 14:07:29 +0200 |
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committer | Gergely Nagy <algernon@balabit.hu> | 2012-08-10 16:53:06 +0200 |
commit | 8af1d67bd3e8a1766cb9984b3771162cc4c19669 (patch) | |
tree | d77ebb9f38a81c98a40bf41cbdc2548f987fd645 /lib/umberlog_preload.c | |
parent | 7d21f9316f32168acefcfe40b5b4b91c8378369c (diff) | |
download | libumberlog-8af1d67bd3e8a1766cb9984b3771162cc4c19669.tar.gz libumberlog-8af1d67bd3e8a1766cb9984b3771162cc4c19669.tar.xz libumberlog-8af1d67bd3e8a1766cb9984b3771162cc4c19669.zip |
Split the library into a linkable and an LD_PRELOAD-able part
In order to satisfy the desire of using libumberlog, specifically
ul_format(), without having to worry about syslog() & friends being
overridden, split the library into two parts:
A linkable library, which provides the new API, but does not override
the legacy syslog() functions; and a new, LD_PRELOAD-able part, which
does override the old ones.
Signed-off-by: Gergely Nagy <algernon@balabit.hu>
Diffstat (limited to 'lib/umberlog_preload.c')
-rw-r--r-- | lib/umberlog_preload.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/lib/umberlog_preload.c b/lib/umberlog_preload.c new file mode 100644 index 0000000..eb5a8d7 --- /dev/null +++ b/lib/umberlog_preload.c @@ -0,0 +1,64 @@ +/* umberlog_preload.c -- CEE-enhanced syslog API, LD_PRELOAD version + * + * Copyright (c) 2012 BalaBit IT Security Ltd. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY BALABIT AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL BALABIT OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#define _GNU_SOURCE 1 + +#define __UL_PRELOAD__ 1 + +#include "umberlog.c" + +#if HAVE___SYSLOG_CHK +void +__syslog_chk (int __pri, int __flag, __const char *__fmt, ...) +{ + va_list ap; + + va_start (ap, __fmt); + ul_legacy_vsyslog (__pri, __fmt, ap); + va_end (ap); +} + +void +__vsyslog_chk (int __pri, int __flag, __const char *__fmt, va_list ap) +{ + ul_legacy_vsyslog (__pri, __fmt, ap); +} +#endif + +void openlog (const char *ident, int option, int facility) + __attribute__((alias ("ul_openlog"))); + +void closelog (void) + __attribute__((alias ("ul_closelog"))); + +#undef syslog +void syslog (int priority, const char *msg_format, ...) + __attribute__((alias ("ul_legacy_syslog"))); + +#undef vsyslog +void vsyslog (int priority, const char *msg_format, va_list ap) + __attribute__((alias ("ul_legacy_vsyslog"))); |