My initla posting was :
>It seems to me that there is some bug in Digital Unix 3.2c when using some
>system calls.
>
>I'm currently using WU FTPD and I was surprised not to see some messages in the
>daemon.log file.
>
>In fact all the messages are in it just before the following sequence :
>
> if (anonymous || guest) {
> /* We MUST do a chdir() after the chroot. Otherwise the old current
> * directory will be accessible as "." outside the new root! */
> if (anonymous) {
>/* the following line is added by me */
> syslog(LOG_INFO,"PW->PW_DIR %s", pw->pw_dir);
> if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
> reply(550, "Can't set guest privileges.");
> goto bad;
> }
>/* the following two lines are added by me */
> reply(220, "after chroot and chdir.");
> syslog(LOG_INFO,"AFTER CHDIR ANONYMOUS %d GUEST %d", anonymous, guest);
>
>
>So what happens ?
>
>The first syslog works correctly and the PW->PW_DIR message is sent in the
>daemon.log file. But, if the "after chroot and chdir." is correctly sent to the
>user, the "AFTER CHDIR ANONYMOUS" is absolutely not sent to the daemon.log file.
>
>When the chdir,chroot is not executed, for an identified user, there is
>absolutely no problem.
>
>So for me the syslog doesn't work any more after the chroot,chdir.
>
>Bug (or feature) ?
Some of you answered that it was a feature because all the syslog related system
calls send message to /dev/log and after the chroot the /dev/log file is no more
there.
The standard Digital ftpd does log the commands after the chroot and Benoit
Maillard (maillard_at_fgt.dec.com) told me that it was because they don't use
the standard system calls.
While looking at the distribution files, I've found a syslog.c file in support
directory and I've modified the Makefile.osf in support/makefiles to include
it in the library.
There were 2 compilation errors on this file, in fact one warning and one error.
The warning is on
if ((p = malloc(strlen(ident) + 1)) == NULL)
and to suppress it, modify in
if ((p = (char *)malloc(strlen(ident) + 1)) == NULL)
The error was on the redefinition of openlog (or closelog). It comes from the
fact that these calls are redefined in <syslog.h>
extern int openlog __((const char *, int, int));
extern int syslog __((int, const char *, ...));
extern void closelog __((void));
extern int setlogmask __((int));
So I've copied /usr/include/syslog.h in the support directory and I've modified
it in suppressing these lines. Then I've modified syslog.c in replacing
#include <syslog.h> by #include "syslog.h"
So now all is working fine and even for anonymous users the commands are logged
correctly as for real users in the daemon.log file.
Daniel
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Received on Thu Jan 18 1996 - 10:20:57 NZDT