sudo ./main command throwing error

[Nitish Saboo]

Hi ,

I am using cgo in this project where I need the following given .so files.

After building the go code, I get the binary 'main'.

ubuntu@hexint09-ingest-0693b91d:/opt/tap-parsing/bin$ ls -lrt

total 17000
-rwxr-xr-x 1 parsing parsing 17405424 Jun 24 11:14 main

'./main' works fine whereas 'sudo ./main' throws the following error:

ubuntu@hexint09-ingest-0693b91d:/opt/tap-parsing/bin$ sudo ./main
./main: error while loading shared libraries: libsyslog-ng-3.6.so.0: cannot open shared object file: No such file or directory

Following is the LD_LIBRARY_PATH set to:

--------------------------------------------------------------

ubuntu@hexint09-ingest-0693b91d:/opt/tap-parsing/bin$ echo $LD_LIBRARY_PATH
 /opt/tap-parsing/dep/syslog/syslog-ng-3.6.2/install/lib/syslog-ng:/opt/tap-parsing/dep/syslog/syslog-ng-3.6.2/install/lib

ubuntu@hexint09-ingest-0693b91d:/opt/tap-parsing/bin$ cd /opt/tap-parsing/dep/syslog/syslog-ng-3.6.2/install/lib/

ubuntu@hexint09-ingest-0693b91d:/opt/tap-parsing/dep/syslog/syslog-ng-3.6.2/install/lib$ ls -lrt
total 2544
-rwxr-xr-x 1 parsing parsing 861259 Jun 24 11:14 libsyslog-ng.so
-rwxr-xr-x 1 parsing parsing   1405 Jun 24 11:14 libsyslog-ng.la
-rwxr-xr-x 1 parsing parsing 861259 Jun 24 11:14 libsyslog-ng-3.6.so.0.0.0
-rwxr-xr-x 1 parsing parsing 861259 Jun 24 11:14 libsyslog-ng-3.6.so.0
drwxr-xr-x 2 parsing parsing   4096 Jun 24 11:25 pkgconfig
drwxr-xr-x 3 parsing parsing   4096 Jun 24 11:25 syslog-ng

Parsing user details:

=================

ubuntu@hexint09-ingest-0693b91d:~$ cat /etc/passwd | grep parsing
parsing:x:1004:1006::/home/parsing:

ubuntu@hexint09-ingest-0693b91d:~$ cat /etc/group | grep parsing
parsing:x:1006:

makefile:

=======

.PHONY: all clean

all: main

main:./lib/syslog-node.so main.go ./lib/syslog-node1.h

go build -v -x main.go

./lib/syslog-node.so: ./lib/syslog-node.c ./lib/syslog-node1.h

gcc -L/usr/local/lib -lsyslog-ng -o ./lib/syslog-node.so -L/usr/local/lib/syslog-ng -ldbparser -c `pkg-config --libs --cflags glib-2.0` -I/usr/local/include/syslog-ng/ -I./lib/syslog-ng-3.6.2/ -I/usr/local/include/eventlog/ ./lib/syslog-node.c

clean:

rm main

rm ./lib/syslog-node.so

I understand I am missing a very small point here but couldn't just figure it out.

Can someone please guide me here ?

Thanks,

Ntiish

[Marcin Romaszewicz]

sudo does not preserve environment variables for security reasons, run:

sudo echo $LD_LIBRARY_PATH

You'll likely see that it's empty, unless you have a global system one set.

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[Michael Stiller]

Hi,

i think sudo kills the LD_LIBRARY_PATH variable.

But this is configurable, try something like:

Defaults env_keep += “LD_LIBRARY_PATH"

in /etc/sudoers and / or consult the sudo man page.

Best regards,

Michael

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[Michael Anderson]

You could try:

sudo -E bash -c 'echo $LD_LIBRARY_PATH'

The -E is --preserve-env

On 6/24/19 12:32 PM, Marcin Romaszewicz wrote:

sudo echo $LD_LIBRARY_PATH

[Nitish Saboo]

HI Michael,

Looks like it is still not preserving the env variable:

nsaboo@ubuntu:~/Documents/goworkspace/src/poc$ export LD_LIBRARY_PATH=/usr/local/lib/syslog-ng
nsaboo@ubuntu:~/Documents/goworkspace/src/poc$ sudo -E bash -c 'echo $LD_LIBRARY_PATH'

nsaboo@ubuntu:~/Documents/goworkspace/src/poc$ echo $LD_LIBRARY_PATH
/usr/local/lib/syslog-ng
nsaboo@ubuntu:~/Documents/goworkspace/src/poc$ 

Thanks,

Nitish

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[Kurtis Rader]

That means your "sudo" configuration doesn't allow the use of the `-E` flag; at least in that specific use case. Alternatively, your system doesn't preserve the value of `LD_LIBRARY_PATH` when the shell is invoked via `sudo -E` because the shell's startup scripts clobber that var.

I hope you recognize this isn't a Go issue. You'll need to figure out how to configure "sudo" on your system to meet your requirements and/or modify the bash startup scripts for the root account not overwrite the value of `LD_LIBRARY_PATH`.

On Mon, Jun 24, 2019 at 11:06 PM Nitish Saboo <nitish....@gmail.com> wrote:

Looks like it is still not preserving the env variable:

nsaboo@ubuntu:~/Documents/goworkspace/src/poc$ export LD_LIBRARY_PATH=/usr/local/lib/syslog-ng
nsaboo@ubuntu:~/Documents/goworkspace/src/poc$ sudo -E bash -c 'echo $LD_LIBRARY_PATH'

nsaboo@ubuntu:~/Documents/goworkspace/src/poc$ echo $LD_LIBRARY_PATH
/usr/local/lib/syslog-ng
nsaboo@ubuntu:~/Documents/goworkspace/src/poc$ 

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