Hi Gabor, Thanks for your help, testing with echo "test" is working fine (check bellow), but with usertty, I still have the same problem. Furthermore, I tried strace and saw the following: *[pid 2177] rt_sigaction(SIGALRM, {sa_handler=0x7fa889b23e10, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fa889541840}, NULL, 8) = 0[pid 2177] write(2</dev/pts/1<char 136:1>>, "[2020-10-28T17:15:36.178232] Posting message to user terminal; user='thanos', line='/dev/ttyS0'\n", 96) = 96[pid 2177] openat(AT_FDCWD, "/dev/ttyS0", O_WRONLY|O_NOCTTY|O_APPEND|O_NONBLOCK) = -1 EACCES (Permission denied)* Do you know why? I am launching syslog-ng as root. (full strace in attachment) Regards, Alex *thanos@debian10st:~$ echo test > /dev/ttyS0testroot@debian10st:/home/thanos# who am ithanos pts/1 2020-10-26 20:21 (10.0.2.2)root@debian10st:/home/thanos# echo "test1" > /dev/pts/1test1root@debian10st:/home/thanos#thanos@debian10st:~$ who am ithanos pts/0 2020-10-26 20:21 (10.0.2.2)thanos@debian10st:~$ echo "test0" > /dev/pts/0test0thanos@debian10st:~$root@debian10st:/home/thanos# who am ithanos pts/2 2020-10-26 20:26 (10.0.2.2)root@debian10st:/home/thanos# echo "test2" > /dev/pts/2test2* On Wed, Oct 28, 2020 at 3:33 PM Gabor Nagy (gnagy) < Gabor.Nagy@oneidentity.com> wrote:
Thanks for the info!
It looks good, messages should be seen on ssh and on serial console too. Can you try out if you can write in the /dev/ttyS0 file (and/or the ssh login console, in your example /dev/pts/1) with a simple "echo test" command and see if it appears on the console, please? ------------------------------ *From:* syslog-ng <syslog-ng-bounces@lists.balabit.hu> on behalf of Alexandre Santos <alexandre.rosas.santos@gmail.com> *Sent:* Tuesday, October 27, 2020 10:20 *To:* Syslog-ng users' and developers' mailing list < syslog-ng@lists.balabit.hu> *Subject:* Re: [syslog-ng] Using usertty
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Hi Gabor,
I am running a Debian buster in a VBox guest.
Can you check which terminals are the user 'thanos' logged in?
*root@debian10st:/home/thanos# w thanos 09:15:47 up 22:00, 4 users, load average: 0.00, 0.02, 0.00 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT thanos ttyS0 - Mon20 8:27 0.05s 0.04s -bash thanos pts/0 10.0.2.2 Mon20 12:54m 0.03s 0.03s -bash thanos pts/1 10.0.2.2 Mon20 12:50m 0.12s 0.18s sshd: thanos [priv] thanos pts/2 10.0.2.2 Mon20 1.00s 0.04s 0.20s sshd: thanos [priv]*
Here are the serial configurations:
*root@debian10st:/home/thanos# stty -F /dev/ttyS0 -a speed 9600 baud; rows 24; columns 80; line = 0; intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = <undef>; discard = <undef>; min = 1; time = 0; -parenb -parodd -cmspar cs8 hupcl -cstopb cread clocal -crtscts -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl ixon ixoff -iuclc -ixany -imaxbel iutf8 opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig -icanon -iexten -echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke -flusho -extproc root@debian10st:/home/thanos# stty -F /dev/pts/0 -a speed 38400 baud; rows 50; columns 184; line = 0; intr = ^C; quit = ^\; erase = ^H; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = <undef>; discard = <undef>; min = 1; time = 0; -parenb -parodd -cmspar cs8 -hupcl -cstopb cread -clocal -crtscts -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl ixon -ixoff -iuclc ixany -imaxbel iutf8 opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig -icanon iexten -echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke -flusho -extproc *
*root@debian10st:/home/thanos# stty -F /dev/pts/1 -a speed 38400 baud; rows 50; columns 184; line = 0; intr = ^C; quit = ^\; erase = ^H; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; discard = ^O; min = 1; time = 0; -parenb -parodd -cmspar cs8 -hupcl -cstopb cread -clocal -crtscts -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff -iuclc ixany -imaxbel iutf8 opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke -flusho -extproc *
*root@debian10st:/home/thanos# stty -F /dev/pts/2 -a speed 38400 baud; rows 50; columns 184; line = 0; intr = ^C; quit = ^\; erase = ^H; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; discard = ^O; min = 1; time = 0; -parenb -parodd -cmspar cs8 -hupcl -cstopb cread -clocal -crtscts -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff -iuclc ixany -imaxbel iutf8 opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke -flusho -extproc *
Thanks, Alex
On Mon, Oct 26, 2020 at 10:59 AM Gabor Nagy (gnagy) < Gabor.Nagy@oneidentity.com> wrote:
Hi Alex!
I've checked your attachments and I see that the messages are sent to pseudo-terminals and the serial port too: [2020-10-23T16:40:20.647481] Posting message to user terminal; user='thanos', line='/dev/ttyS0' [2020-10-23T16:40:20.647518] Posting message to user terminal; user='thanos', line='/dev/pts/0' [2020-10-23T16:40:20.647530] Posting message to user terminal; user='thanos', line='/dev/pts/1' [2020-10-23T16:40:20.647541] Posting message to user terminal; user='thanos', line='/dev/pts/2'
Can you check which terminals are the user 'thanos' logged in? E.g. use the following command on the command line: $w thanos
If you don't see a tty with ssh login, that can explain it.
About the serial port, maybe it's misconfigured. Syslog-ng uses simple open/write calls on the device files , e.g. /dev/ttyS0. Can you try out if you can write in the /dev/ttyS0 file with a simple "echo test" command, please? Can you tell us a bit more about your host and how did you set up the serial port?
Regards, Gabor ------------------------------ *From:* syslog-ng <syslog-ng-bounces@lists.balabit.hu> on behalf of Alexandre Santos <alexandre.rosas.santos@gmail.com> *Sent:* Friday, October 23, 2020 17:46 *To:* Syslog-ng users' and developers' mailing list < syslog-ng@lists.balabit.hu> *Subject:* [syslog-ng] Using usertty
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Hi, I am trying to use usertty(*) to send log all messages with severity equal or higher than critical to every user logged.
But I am not getting any messages in serial port or ssh.
I am sending the configurations and the debug log in attachment.
Can you help me to understand what is happening?
Thanks in advance, Alex
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