[Solved] Sip over Openvpn on 3g and wifi - maemo.org

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rajil.s	2010-07-15 , 18:21
Posts: 306 \| Thanked: 106 times \| Joined on Feb 2010	#1

Hi,

I have finally a working sip over openvpn today and wanted to post about it for everybodys benefit. I have tested this both on 3g (using three UK) and wifi. Here are the following files needed. All these files go in /etc/openvpn.

First the client config

Code:

#cat  openvpn_client.conf
client
script-security 2
up /etc/openvpn/nokia.up
down /etc/openvpn/nokia.down
ipchange /etc/openvpn/add_default_route.sh
dev tun
proto udp
remote xx.dyndns.org 1194
resolv-retry infinite
nobind
persist-key
persist-tun
ca ca.crt
cert client.crt
key client.key
comp-lzo
verb 3

nokia.up script

Code:

 
# cat nokia.up 
#!/bin/bash

case $script_type in

up)
    for optionname in ${!foreign_option_*} ; do
        option="${!optionname}"
        echo $option
        part1=$(echo "$option" | cut -d " " -f 1)
        if [ "$part1" == "dhcp-option" ] ; then
            part2=$(echo "$option" | cut -d " " -f 2)
            part3=$(echo "$option" | cut -d " " -f 3)
            if [ "$part2" == "DNS" ] ; then
                IF_DNS_NAMESERVERS="$IF_DNS_NAMESERVERS $part3"
            fi
            if [ "$part2" == "DOMAIN" ] ; then
                IF_DNS_SEARCH="$part3"
            fi
        fi
    done
    R=""
    if [ "$IF_DNS_SEARCH" ] ; then
        R="${R}search $IF_DNS_SEARCH\n"
    fi
    for NS in $IF_DNS_NAMESERVERS ; do
        R="${R}nameserver $NS\n"
    done
    if [ ! -f /etc/resolv.conf.prevpn ] ; then
        mv /etc/resolv.conf /etc/resolv.conf.prevpn
    fi
    echo -e "$R" > /etc/resolv.conf
    ;;

down)
    if [ -f /etc/resolv.conf.prevpn ] ; then
        mv /etc/resolv.conf.prevpn /etc/resolv.conf
    fi
    ;;

esac


source /etc/osso-af-init/af-defines.sh

for acct in `mc-tool list | grep sofiasip/sip`; do 
        mc-tool update $acct string:local-ip-address=$4

done

nokia.down script

Code:

#cat nokia.down

#!/bin/bash

case $script_type in

up)
    for optionname in ${!foreign_option_*} ; do
        option="${!optionname}"
        echo $option
        part1=$(echo "$option" | cut -d " " -f 1)
        if [ "$part1" == "dhcp-option" ] ; then
            part2=$(echo "$option" | cut -d " " -f 2)
            part3=$(echo "$option" | cut -d " " -f 3)
            if [ "$part2" == "DNS" ] ; then
                IF_DNS_NAMESERVERS="$IF_DNS_NAMESERVERS $part3"
            fi
            if [ "$part2" == "DOMAIN" ] ; then
                IF_DNS_SEARCH="$part3"
            fi
        fi
    done
    R=""
    if [ "$IF_DNS_SEARCH" ] ; then
        R="${R}search $IF_DNS_SEARCH\n"
    fi
    for NS in $IF_DNS_NAMESERVERS ; do
        R="${R}nameserver $NS\n"
    done
    if [ ! -f /etc/resolv.conf.prevpn ] ; then
        mv /etc/resolv.conf /etc/resolv.conf.prevpn
    fi
    echo -e "$R" > /etc/resolv.conf
    ;;

down)
    if [ -f /etc/resolv.conf.prevpn ] ; then
        mv /etc/resolv.conf.prevpn /etc/resolv.conf
    fi
    ;;

esac


source /etc/osso-af-init/af-defines.sh

for acct in `mc-tool list | grep sofiasip/sip`; do
        mc-tool update $acct clear:local-ip-address
done

andf finally default route script

Code:

#cat add_default_route.sh

#!/bin/sh

#if gprs0 up and no flagged default route ; then create one
#use with ipchange /etc/openvpn/add_default_route.sh in openvpn conf
#after setting script-security 2
gprsroute=`route | grep gprs` ; defroute=`route | grep default | grep G` ; if [ -n "$gprsroute" -a -z "$defroute" ]; then nexthop=`ifconfig gprs0 | grep "inet addr" | cut -d : -f 3 | cut -d " " -f 1` ; route add -host $nexthop dev gprs0 ; route add default gw $nexthop ; fi

Also wanted to add that this method works well if the sip provider is hosted outside the network. However in my case i have an asterisk server running inside my local network at 172.16.1.10. Thus i have to change my sip uri to reflect the internal asterisk server to 50@172.16.1.10 whereas normally i would simply use 50@xx.dyndns.org. This is a big pain because i have to keep switching between the two accounts depending on whether i am usng vpn or not. If somebody has any workaround please let me know.

Ok. The above issue is sorted. I use a Linksys WRT54GL router running dd-wrt. I had to simply add an extra arguement to dnsmasq as

Code:

address=/xx.dyndns.org/172.16.1.10

__________________
------------------------------------------------------------------
Voice choppy on sip calls
Please vote for bug number 10388

Last edited by rajil.s; 2010-07-16 at 22:23. Reason: Fixed dnsmasq in the router

Quote & Reply |

The Following 5 Users Say Thank You to rajil.s For This Useful Post:
9000, hellhammer, phedders, rustler, tele

9000	2010-07-16 , 04:03
Posts: 1,425 \| Thanked: 983 times \| Joined on May 2010 @ Hong Kong	#2

I don't use it atm but I'll bookmark it for future use. Thank you very much for your sharing.

Quote & Reply |

hellhammer	2010-07-16 , 04:35
Posts: 22 \| Thanked: 17 times \| Joined on Jan 2010 @ IDN	#3

thank you very much good sir.

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mrwhy	2011-01-07 , 18:08
Posts: 1 \| Thanked: 0 times \| Joined on Jan 2011	#4

Hi Rajil.S

I´m trying your way, but something won´t work.

I think i don´t need the way with default route.

The problem is in executing the scripts.

OpenVPN throws an error :

script failed: could not execute external program

in my openvpn config i have also set the script-security to 2 and the rights on the scripts are 755 but i don´t work.

Do you have an idea?

Thanks very much
Greetz

Mr.

Quote & Reply |

rajil.s	2011-01-07 , 19:11
Posts: 306 \| Thanked: 106 times \| Joined on Feb 2010	#5

do you have mc-tool installed?

__________________
------------------------------------------------------------------
Voice choppy on sip calls
Please vote for bug number 10388

Quote & Reply |

praveenchand	2011-01-07 , 22:06
Posts: 440 \| Thanked: 203 times \| Joined on May 2010	#6

rajil, i want to setup sip over openvpn, please let me know step by step procedure. I have dyndns account, have installed mc-tools, but dnt know how to configure that, please explain. thanks.

Quote & Reply |

worldclass85	2011-04-08 , 15:50
Posts: 3 \| Thanked: 0 times \| Joined on Mar 2011	#7

Hi rajil,

I know this is a dead thread. but any chance you could show the server config file for openvpn? That's were most of the action seems to be taking place. I have windows running openvpn server. I hope it is something that windows can handle without iptables.

I know you used the dev tun and I'd like to know if you think bridging (dev tap) works as well.

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