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/*
* Copyright (c) 2011 Paul Tagliamonte <paultag@debian.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#define _GNU_SOURCE 1
/* On glibc systems, this is needed for RTLD_NEXT to be defined.
* This breaks in Cygwin. Not that that really matters in this small case. */
#undef _LARGEFILE64_SOURCE
#undef _FILE_OFFSET_BITS
#undef _TIME_BITS
#include <dlfcn.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <execinfo.h>
static int (*orig_open)(const char *, int, ...);
static int (*orig_open64)(const char *, int, ...);
static int (*orig_mkdir)(const char *, mode_t);
static int (*orig_creat)(const char *, mode_t);
static int (*orig_creat64)(const char *, mode_t);
static FILE * (*orig_fopen)(const char *, const char *);
static FILE * (*orig_fopen64)(const char *, const char *);
static FILE * (*orig_freopen)(const char *, const char *, FILE *);
static FILE * (*orig_freopen64)(const char *, const char *, FILE *);
static void tmperamental_init ( void ) __attribute__((constructor));
#define iflive(x, ...) if (orig_ ## x )
static void tmperamental_init ( void ) {
orig_open = dlsym(RTLD_NEXT, "open");
orig_open64 = dlsym(RTLD_NEXT, "open64");
orig_mkdir = dlsym(RTLD_NEXT, "mkdir");
orig_creat = dlsym(RTLD_NEXT, "creat");
orig_creat64 = dlsym(RTLD_NEXT, "creat64");
orig_fopen = dlsym(RTLD_NEXT, "fopen");
orig_fopen64 = dlsym(RTLD_NEXT, "fopen64");
orig_freopen = dlsym(RTLD_NEXT, "freopen");
orig_freopen64 = dlsym(RTLD_NEXT, "freopen64");
}
#define fixup(x) if (!orig_ ## x) orig_ ## x = dlsym(RTLD_NEXT, #x)
#define SIZE (100)
#define FIRST_FRAME (1)
void enforcer ( const char * pathname ) {
if ( strncmp("/tmp/", pathname, 5) == 0 ) {
int nframes;
void *buffer[SIZE];
fprintf(stderr, "tmperamental: caught a write to /tmp.\n");
nframes = backtrace(buffer, SIZE);
if(nframes > FIRST_FRAME)
backtrace_symbols_fd(buffer+FIRST_FRAME, nframes+FIRST_FRAME, 2);
abort();
}
}
#define mode_t_or_int typeof(+(mode_t)0)
int open ( const char * pathname, int flags, ... ) {
enforcer(pathname);
va_list v;
va_start(v, flags);
fixup(open);
if ( flags & O_CREAT ) {
mode_t mode = va_arg(v, mode_t_or_int);
va_end(v);
return orig_open(pathname, flags, mode);
} else {
va_end(v);
return orig_open(pathname, flags);
}
}
int open64 ( const char * pathname, int flags, ... ) {
enforcer(pathname);
va_list v;
va_start(v, flags);
fixup(open64);
if ( flags & O_CREAT ) {
mode_t mode = va_arg(v, mode_t_or_int);
va_end(v);
return orig_open64(pathname, flags, mode);
} else {
va_end(v);
return orig_open64(pathname, flags);
}
}
int mkdir ( const char *pathname, mode_t mode ) {
enforcer( pathname );
fixup(mkdir);
return orig_mkdir(pathname, mode);
}
int creat ( const char *pathname, mode_t mode ) {
enforcer( pathname );
fixup(creat);
return orig_creat(pathname, mode);
}
int creat64 ( const char *pathname, mode_t mode ) {
enforcer( pathname );
fixup(creat64);
return orig_creat64(pathname, mode);
}
FILE * fopen ( const char * path, const char *mode ) {
enforcer(path);
fixup(fopen);
return orig_fopen( path, mode );
}
FILE * fopen64 ( const char * path, const char *mode ) {
enforcer(path);
fixup(fopen64);
return orig_fopen64( path, mode );
}
FILE * freopen ( const char *path, const char *mode, FILE * stream ) {
enforcer(path);
fixup(freopen);
return orig_freopen(path, mode, stream);
}
FILE * freopen64 ( const char *path, const char *mode, FILE * stream ) {
enforcer(path);
fixup(freopen64);
return orig_freopen64(path, mode, stream);
}
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