Bugtraq mailing list archives
Re: chroot'ed environment?
From: don () paranoia com (don () paranoia com)
Date: Thu, 20 Apr 1995 03:32:16 -0500 (CDT)
Excerpted from 'man 3 openlog' on an AIX 3.2.5 system, but it should be in any BSD4.3 system: #include <syslog.h> int openlog (ID, LogOption, Facility) char *ID; int LogOption, Facility; ... LogOption Specifies a bit field that indicates logging options. The values of LogOption are: ... LOG_NDELAY Opens the connection to the syslogd command immediate- ly, instead of when the first message is logged. This option is useful for programs that need to manage the order in which file descriptors are allocated. ... So if you call openlog(argv[0],LOG_NDELAY,LOG_DAEMON); the LOG_NDELAY will open /dev/log *now* (presumably before you chroot()). And as we all know, open file descriptors are not affected by a chroot().... Valdis Kletnieks Computer Systems Engineer Virginia Tech
Come to think of it, 'sfingerd' (ftp://hplyot.obspm.fr/net/sfingerd*.tar.gz) uses this technique, and has been running here at paranoia.com for a while now, I believe. Works quite well. Michael E. Glasgow -- don () paranoia com http://www.paranoia.com
Current thread:
- chroot'ed environment? Marc Samama (Apr 18)
- <Possible follow-ups>
- Re: chroot'ed environment? smb () research att com (Apr 19)
- Re: chroot'ed environment? der Mouse (Apr 19)
- Re: chroot'ed environment? Valdis.Kletnieks () vt edu (Apr 20)
- Re: chroot'ed environment? oea!owner-bugtraq () oea xs4all nl (Apr 19)
- Re: chroot'ed environment? don () paranoia com (Apr 20)