[Bug 1358748] Re: socat fdout option will not open output file descriptor
Hello Greg, absolutely great, you are right: the -u invalidated the fdout option, even though log output said it was opened. My fault, I apologize for the time you spent. Thanks a lot for your help! All the best Hendrik -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to socat in Ubuntu. https://bugs.launchpad.net/bugs/1358748 Title: socat fdout option will not open output file descriptor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/socat/+bug/1358748/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1358748] [NEW] socat fdout option will not open output file descriptor
Public bug reported:
The options "fdin=x,fdout=y" are used to create file descriptors in order to
have scripts that are executed via EXEC communicate with the socket.
After heaps of debugging, I noticed that the output file descriptor is never
actually opened by socat (although it says otherwise).
Please see the output of socat and the corresponding script, which executes
"filan" to display currently open FDs.
You can see that FD3 is open and input is processed. However, when
writing to FD4, the error message "Bad file descriptor" appears (not
shown in log). FD4 is clearly never opened (what would have been
expected behaviour)
# socat -d -d -u TCP4-LISTEN:80,reuseaddr,fork,su=nobody
EXEC:./script.sh,fdout=4,fdin=3 | tee connlog.log
2014/08/19 15:26:15 socat[26813] N listening on AF=2 0.0.0.0:80
2014/08/19 15:26:19 socat[26813] N accepting connection from AF=2 1.2.3.4:49874
on AF=2 4.5.6.7:80
2014/08/19 15:26:19 socat[26813] N forked off child process 26815
2014/08/19 15:26:19 socat[26813] N listening on AF=2 0.0.0.0:80
2014/08/19 15:26:19 socat[26815] N forking off child, using socket for writing
2014/08/19 15:26:19 socat[26815] N forked off child process 26816
2014/08/19 15:26:19 socat[26815] N forked off child process 26816
2014/08/19 15:26:19 socat[26815] N starting data transfer loop with FDs [4,4]
and [3,3]
2014/08/19 15:26:19 socat[26816] N execvp'ing "./script.sh"
[SCRIPT] Received http request.
FD type device inode modelinks uid gid rdevsize
blksize blocks atime mtime
ctime cloexec flags sigown sigio
0: chrdev0,125 020620 1 0 5 136,2 0
10240 Tue Aug 19 15:26:08 2014Tue Aug 19 15:26:16 2014
Thu Jul 17 21:36:34 20140 x008002 0 0
(no STREAMS modules)/dev/pts/2 IFLAGS=0500 OFLAGS=0005
CFLAGS=00bf LFLAGS=8a3b cc[0]=^C cc[1]=^\ cc[2]=x7F cc[3]=^U cc[4]=^D
cc[5]=^@ cc[6]=^A cc[7]=^@ cc[8]=^Q cc[9]=^S cc[10]=^Z cc[11]=^@ cc[12]=^R
cc[13]=^O cc[14]=^W cc[15]=^V cc[16]=^@ cc[17]=^@ cc[18]=^@ cc[19]=^@ cc[20]=^@
cc[21]=^@ cc[22]=^@ cc[23]=^@ cc[24]=^@ cc[25]=^@ cc[26]=^@ cc[27]=^@ cc[28]=^@
cc[29]=^@ cc[30]=^@ cc[31]=^@poll: OUT,
1: pipe 0,8 17895603010600 1 0 0 0,0
0 40960 Tue Aug 19 15:26:19 2014Tue Aug 19 15:26:19
2014Tue Aug 19 15:26:19 20140 x01 0 0
(no STREAMS modules)poll: OUT,
2: chrdev0,125 020620 1 0 5 136,2 0
10240 Tue Aug 19 15:26:08 2014Tue Aug 19 15:26:16 2014
Thu Jul 17 21:36:34 20140 x008002 0 0
(no STREAMS modules)/dev/pts/2 IFLAGS=0500 OFLAGS=0005
CFLAGS=00bf LFLAGS=8a3b cc[0]=^C cc[1]=^\ cc[2]=x7F cc[3]=^U cc[4]=^D
cc[5]=^@ cc[6]=^A cc[7]=^@ cc[8]=^Q cc[9]=^S cc[10]=^Z cc[11]=^@ cc[12]=^R
cc[13]=^O cc[14]=^W cc[15]=^V cc[16]=^@ cc[17]=^@ cc[18]=^@ cc[19]=^@ cc[20]=^@
cc[21]=^@ cc[22]=^@ cc[23]=^@ cc[24]=^@ cc[25]=^@ cc[26]=^@ cc[27]=^@ cc[28]=^@
cc[29]=^@ cc[30]=^@ cc[31]=^@poll: OUT,
3: socket0,7 178918570140777 1 65534 65534 0,0
0 40960 Thu Jan 1 01:00:00 1970Thu Jan 1 01:00:00
1970Thu Jan 1 01:00:00 19700 x02 0 0
(no STREAMS modules)DEBUG=0 REUSEADDR=0 TYPE=1 ERROR=0 DONTROUTE=0
BROADCAST=0 SNDBUF=212992 RCVBUF=212992 KEEPALIVE=0 OOBINLINE=0
NO_CHECK=0 PRIORITY=0 LINGER={0,0} BSDCOMPAT=0 REUSEPORT=0
PASSCRED=0 PEERCRED={26815,65534} RCVLOWAT=1 SNDLOWAT=1
RCVTIMEO={0,0} SNDTIMEO={0,0} BINDTODEVICE={0,0}
ATTACH_FILTER={0,0} AF=1 "" <-> AF=1 "" poll:
IN,OUT,; FIONREAD=353; recvmsg=1,
releases
# lsb_release -rd
Description:Ubuntu 14.04 LTS
Release:14.04
# apt-cache policy socat
socat:
Installed: 1.7.2.3-1
Candidate: 1.7.2.3-1
3) and 4) -> see above.
Thanks a lot for processing this bug.
** Affects: socat (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1358748
Title:
socat fdout option will not open output file descriptor
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