Are there any OpenBSD Kernel/Architecture Books?
What resources would be a good primer on the OpenBSD kernel and general architecture and give me a good understanding of the internals? FreeBSD has this: https://docs-legacy.freebsd.org/doc/13.0-RELEASE/usr/local/share/doc/freebsd/en_US.ISO8859-1/books/arch-handbook/book.html I understand that in OpenBSD there is the mantra that source code is documentation. But as a beginner I'm afraid that I do need something explicit that would allow me read the source code in an effective manner.
Re: Recover partition table/FFS2 after overwrite?
On Thu, Sep 09, 2021 at 12:07:04PM +0200, Jan Stary wrote: > On Sep 08 16:31:36, thomaswindi...@thomaswindisch.net wrote: > > I mangaged to restore my drive using > > > > #fdisk -iy > > #disklabel -R > > #fsck > > > > Thanks Geoff and David. > > > > After reinstalling OpenBSD everything seems so be running fine. > > If you reinstalled anyway, why did you bother restoring? > I copied what I needed from /var and /usr to /home and only kept /home on the new install (by not setting a mount point for /home and latter adding it manually). > > Almost. > > > > When I now run grep I get this: > > > > $ grep > > warning: libc.so.96.0: minor version >= 1 expected, using it anyway > > ld.so: grep: can't load library 'libz.so.6.0' > > Killed > > > > I was previously running -current and I reinstalled -release 6.9. > > It seems that grep is a remnant of the old install? How come? > > > > On Wed, Sep 08, 2021 at 10:15:30PM -, Stuart Henderson wrote: > On 2021-09-08, Thomas Windisch wrote: > > I mangaged to restore my drive using > > > > #fdisk -iy > > #disklabel -R > > #fsck > > > > Thanks Geoff and David. > > > > After reinstalling OpenBSD everything seems so be running fine. > > Almost. > > > > When I now run grep I get this: > > > > $ grep > > warning: libc.so.96.0: minor version >= 1 expected, using it anyway > > ld.so: grep: can't load library 'libz.so.6.0' > > Killed > > > > I was previously running -current and I reinstalled -release 6.9. > > It seems that grep is a remnant of the old install? How come? > > If you "downgrade" you will need to clean up newer libraries, > things from packages, sometimes perl modules, etc. It is for this reason > that this is really not a supported thing to do. I did not downgrade via the "Upgrade" option but via the "Install" option. The installer running newfs should cleared all data in /usr, /var, and /, right? After rebooting I now cannot boot. The error I now get is: Abort trap > > -- > Please keep replies on the mailing list. > I guess I'll just backup /home to another drive and do clean reinstall.
Re: Recover partition table/FFS2 after overwrite?
I mangaged to restore my drive using #fdisk -iy #disklabel -R #fsck Thanks Geoff and David. After reinstalling OpenBSD everything seems so be running fine. Almost. When I now run grep I get this: $ grep warning: libc.so.96.0: minor version >= 1 expected, using it anyway ld.so: grep: can't load library 'libz.so.6.0' Killed I was previously running -current and I reinstalled -release 6.9. It seems that grep is a remnant of the old install? How come?
Recover partition table/FFS2 after overwrite?
I think I just overwrote my file system by using sd1 instead of sd2: # pv install69.img > /dev/rsd1c sd1 is softraid crypto device that holds the system partitions and data: $ df -h Filesystem SizeUsed Avail Capacity Mounted on /dev/sd1a 1.9G143M1.7G 8%/ /dev/sd1f 843G734G 66.2G92%/home /dev/sd1b 9.7G 14.5M9.2G 0%/tmp /dev/sd1e 48.4G 40.8G5.2G89%/usr /dev/sd1d 19.4G 16.9G1.5G92%/var # disklabel sd1 # /dev/rsd1c: type: SCSI disk: SCSI disk label: SR CRYPTO duid: a1f07cee2aba3a55 flags: bytes/sector: 512 sectors/track: 63 tracks/cylinder: 255 sectors/cylinder: 16065 cylinders: 121600 total sectors: 1953518528 boundstart: 64 boundend: 1953504000 drivedata: 0 16 partitions: #size offset fstype [fsize bsize cpg] a: 4208960 64 4.2BSD 2048 16384 12960 # / b: 20980896 4209024 4.2BSD 2048 16384 12960 # /tmp c: 19535185280 unused d: 41945696 25189920 4.2BSD 2048 16384 12960 # /var e:104872320 67135616 4.2BSD 2048 16384 12960 # /usr f: 1781496064172007936 4.2BSD 8192 65536 52270 # /home The system is currently up and running. I'm not sure what has been overwritten. Possibly only sd1a /? Is it possible to recover from this without loosing access to the data in /home, /var, /usr?
Re: blacklistd analogue
On Wed, Mar 24, 2021 at 08:33:35PM +0200, jeanpierre wrote: > Does there exist an OpenBSD analogue for FreeBSD's blacklistd daemon? > > For the sake of completeness: blacklistd is a daemon that, using pf > anchors, blocks connections from abusive hosts to parctiular services > (e.g. sshd) until they start behaving themselves again. > > I find it very useful for timming down log files. > > Regards, > Jean-Pierre > I believe that you would be able to achieve that with pf: https://www.openbsd.org/faq/pf/filter.html#stateopts
