Hi
there was a mail a while back on this list about using the LD_PRELOAD
feature on Solaris in order to override the location of nsswitch.conf for
smbd so only it would use winbindd. I did some digging and came up with the
code at the bottom of this mail ( I've overridden every file open call I
could find, but I think it's only the _open() call which is actually
necessary ). Initial testing seems to show it working ok - may be of use to
some people.
tim.
ps I'm not a C coder so this may not be the best in the world - if anyone
can do it better then please fix and post to the list.
/*
* Intercept open() call so that rather than using /etc/nsswitch.conf,
* a different file can be used. Build as follows:
* cc -o nsswitch_interposer.so -G -Jpic nsswitch_interposer.c
* setenv LD_PRELOAD $cwd/nsswitch_interposer.so
* run smbd
*
* Remove the printf statements in each function when using in earnest -
they are just there for debugging.
*/
#include <stdio.h>
#include <strings.h>
#include <dlfcn.h>
FILE* fopen(const char *fpath, const char *mode ){
static FILE * (*func)(const char*, const char *);
if(!func)
func = ( FILE * (*)(const char*, const char *))dlsym(RTLD_NEXT,
"fopen");
if(strcmp(fpath,"/etc/nsswitch.conf")==0)
fpath = "/etc/nsswitch_samba.conf";
printf(" calling fopen(%s, %s)\n", fpath, mode);
return(func(fpath, mode));
}
FILE* fopen64(const char *fpath, const char *mode ){
static FILE * (*func)(const char*, const char *);
if(!func)
func = ( FILE * (*)(const char*, const char *))dlsym(RTLD_NEXT,
"fopen64");
if(strcmp(fpath,"/etc/nsswitch.conf")==0)
fpath = "/etc/nsswitch_samba.conf";
printf(" calling fopen64(%s, %s)\n", fpath, mode);
return(func(fpath, mode));
}
int open(const char *path, int oflag ){
static int (*func)(const char*, int);
if(!func)
func = ( int (*)(const char*, int))dlsym(RTLD_NEXT, "open");
if(strcmp(path,"/etc/nsswitch.conf")==0)
path = "/etc/nsswitch_samba.conf";
printf(" calling open(%s, %d)\n", path, oflag);
return(func(path, oflag));
}
int _open(const char *path, int oflag ){
static int (*func)(const char*, int);
if(!func)
func = ( int (*)(const char*, int))dlsym(RTLD_NEXT, "_open");
if(strcmp(path,"/etc/nsswitch.conf")==0)
path = "/etc/nsswitch_samba.conf";
printf(" calling _open(%s, %d)\n", path, oflag);
return(func(path, oflag));
}
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