Exec configure command in my C program?

[ackema]

Beside using http api, how could a C program running in vyos exec config command, such as:

set interfaces ethernet eth0 address dhcp

get interfaces ethernet eth0 address

Thanks.

[Viacheslav]

For op-mode you can use op mode wrapper “/opt/vyatta/bin/vyatta-op-cmd-wrapper show version”

[ackema]

Thanks!

/opt/vyatta/bin/vyatta-op-cmd-wrapper show interfaces
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface        IP Address                        S/L  Description
---------        ----------                        ---  -----------
eth0             192.168.21.171/24                 u/u  
eth1             192.168.48.31/24                  u/u  
lo               127.0.0.1/8                       u/u  
                 ::1/128

Do we have something like /opt/vyatta/bin/vyatta-config-cmd-wrapper ?
I want to set/get configure in my C program.

[Viacheslav]

Not sure if it will work in C
But you should use “source”

source /opt/vyatta/etc/functions/script-template

configure
set protocols bgp system-as 65536
set protocols bgp neighbor 192.168.122.1 remote-as 65002
commit
exit

I’m not C guy
but something like this

#include <stdlib.h>

int main() {
    system("source /opt/vyatta/etc/functions/script-template");
    system("configure");
    system("set protocols bgp system-as 65536");
    system("set protocols bgp neighbor 192.168.122.1 remote-as 65002");
    system("commit");
    system("exit");

    return 0;
}

Another example:

cfg="/opt/vyatta/sbin/vyatta-cfg-cmd-wrapper"

$cfg begin
$cfg set interfaces ethernet eth1 description TEST
$cfg commit
$cfg save
$cfg end

I.e. C

#include <stdlib.h>

int main() {
    system("/opt/vyatta/sbin/vyatta-cfg-cmd-wrapper begin");
    system("/opt/vyatta/sbin/vyatta-cfg-cmd-wrapper set interfaces ethernet eth1 description TEST");
    system("/opt/vyatta/sbin/vyatta-cfg-cmd-wrapper commit");
    system("/opt/vyatta/sbin/vyatta-cfg-cmd-wrapper end");

    return 0;
}

[Netboy3]

That’s not going to work. Each time you call system() it forks a child process that executes a POSIX shell (/bin/sh) with the -c string parameter that you specify. This means that every such call starts a new shell process. Your call to source, for example, is useless as once that system() call is returning, all your environment set by the template is gone.

[ackema]

Thanks, guys, and it works:

#include <stdlib.h>

int main() {
    system("/opt/vyatta/sbin/vyatta-cfg-cmd-wrapper begin;/opt/vyatta/sbin/vyatta-cfg-cmd-wrapper set interfaces ethernet eth1 description TEST;/opt/vyatta/sbin/vyatta-cfg-cmd-wrapper commit;/opt/vyatta/sbin/vyatta-cfg-cmd-wrapper end;");
    return 0;
}