Hello!
Hello,
TLDR: I can setup static IP or use dhcpcd to get address, but not
dhclient.
Let me elaborate. I run 12-CURRENT on my laptop and use CBSD as jail
manager (I don't think it matters).
What version of CURRENT are you using?
# dhclient eth0
chroot
exiting.
This is what I found with truss: https://gist.github.com/anonymous/
36a4e2bf1760198971934ff609a7d0de#file-gistfile1-txt-L227-L228. Selected
lines are what I think is the problem. Offending line in the code is
probably https://svnweb.freebsd.org/base/head/sbin/dhclient/
dhclient.c?revision=317915&view=markup#l507. With that asumption, Oleg,
Is there any chance you don’t have /var/empty in your jail?
sudo jail -c name=alcatraz persist vnet vnet.interface=epair0b
(in the jail) dhclient epair0b
…
fsync(0x9) = 0 (0x0)
close(8) = 0 (0x0)
socket(PF_ROUTE,SOCK_RAW,0) = 8 (0x8)
shutdown(8,SHUT_WR) = 0 (0x0)
cap_rights_limit(8,{ CAP_READ,CAP_EVENT }) = 0 (0x0)
chroot("/var/empty") = 0 (0x0)
chdir("/") = 0 (0x0)
setgroups(0x1,0x800e2c1e4) = 0 (0x0)
…
I also see the DCHP request packets on the other end of the epair
interface.
Regards,
Kristof
What is your FreeBSD version? This problem reproduced on FreeBSD 12 only.
/var/empty is exist and trivial test:
#include <stdio.h>
#include <stdlib.h>
int main()
{
printf("%d\n",chroot("/var/empty");
}
works successfully.
I think I found something, but I do not understand why this is only
observed in jail and with commit change this.
The problem about which the Goran wrote can be fixed with:
# diff -ruN dhclient.c-orig dhclient.c
--- dhclient.c-orig 2017-10-10 23:51:52.451361000 +0000
+++ dhclient.c 2017-10-10 23:54:55.803404000 +0000
@@ -479,6 +479,7 @@
fork_privchld(pipe_fd[0], pipe_fd[1]);
+ pidfile_close(pidfile);
close(ifi->ufdesc);
ifi->ufdesc = -1;
close(ifi->wfdesc);
From pidfile(3) man page:
The pidfile_close() function closes a pidfile. It should be used after
daemon fork()s to start a child process.
chroot(2) in dhclient return NOPERM (via global errno). it seems to be
related to open descriptor outside the chroot.
I'm not sure if this fd leak (due to pidfile_remove at the end of
dhclient), nevertheless closing pid fd in my jail/FreeBSD12 before chroot
solve dhclient issue.