SEMS v. 1.7.0 IPV4/IPV6 networking problem?

[pebastega]

Hi Everyone,
I'm using SEMS (v. 1.7.0) with Kamailio proxy to make a ipv4/ipv6 interworking:

Sip Client <-------> Proxy <--- IPV4 ---> Sems <--- IPV6 ---> MyVoipGw

and I have any problems with sems ipv6 configuration.

I configured two sems ntw interfaces IPV4/IPV6:

ifexternal
sip_ip_ifexternal=192.168.110.79
sip_port_ifexternal=5082
media_ip_ifexternal=192.168.110.79
rtp_low_port_ifexternal=10000
rtp_high_port_ifexternal=60000

ifexternalipv6
sip_ip_ifexternalipv6=2002:c0a8:6e4f:5::1
sip_port_ifexternalipv6=5092
media_ip_ifexternalipv6=2002:c0a8:6e4f:5::1
rtp_low_port_ifexternalipv6=70000
rtp_high_port_ifexternalipv6=80000

when sems startup I see in the logs:

INFO: Signaling interfaces:
INFO: (0) name='ifinternal';LocalIP='127.0.0.1';LocalPort='5080';PublicIP='';TCP=2000/3600000
INFO: (1) name='ifexternal';LocalIP='192.168.110.79';LocalPort='5082';PublicIP='';TCP=2000/3600000
INFO: (2) name='ifexternalipv6';LocalIP='[2002:c0a8:6e4f:5::1]';LocalPort='5092';PublicIP='';TCP=2000/3600000
INFO: Signaling address map:
INFO: 127.0.0.1 -> ifinternal
INFO: 192.168.110.79 -> ifexternal
INFO: [2002:c0a8:6e4f:5::1] -> ifexternalipv6
INFO: Media interfaces:
INFO: (0) name='ifexternal';LocalIP='192.168.110.79';Ports=[10000;60000];PublicIP=''
INFO: (1) name='ifexternalipv6';LocalIP='2002:c0a8:6e4f:5::1';Ports=[70000;80000];PublicIP=''

but when sems receives a request to forward via next_hop=2002:C0A8:6E4F:5:A00:27FF:FE25:A4B9 (IPV6 ADDRESS MYVOIPGW) I have an error in trace:

ERROR: Could not find a local interface for resolved local IP (local_tag='3AF5A893-595D004B000F0808-4AAFF480';local_ip='2002:c0a8:6e4f:5::1')
WARNING: Error while computing outbound interface: default interface will be used instead.
DEBUG: setting outbound interface to 0

and sems crash with:

ERROR: sendto(12;]:5060): Address family not supported by protocol
ERROR: Error from transport layer
Segmentation fault

From code I see in "getOutboundIf" method of "AmBasicSipDialog" class that retrieve the interface to use to send sip packets from "next_hop" host but the method do not find interface because the search ipv6 address without "[" "]".

From code I see:

if(!next_hop.empty() &&
    !parse_next_hop(stl2cstr(next_hop),ip_list) && -------------> parse_next_hop method return next_hop host without "[" "]"
  !ip_list.empty()) {
      dest_ip = c2stlstr(ip_list.front().host);
}
if(get_local_addr_for_dest(dest_ip,local_ip) < 0){ -----------> "get_local_addr_for_dest" method use "dest_ip" to get "local_ip" for correct ip family (IPV6) and return it without "[" "]"
    ERROR("No local address for dest '%s' (local_tag='%s')",dest_ip.c_str(),local_tag.c_str());
  goto error;
}

if_it = AmConfig::LocalSIPIP2If.find(local_ip); -------------> local_ip not found in LocalSIPIP2If because in this list ipv6 address is in [] form.
if(if_it == AmConfig::LocalSIPIP2If.end()){
    ERROR("Could not find a local interface for resolved local IP (local_tag='%s';local_ip='%s')",
    local_tag.c_str(), local_ip.c_str());
  goto error;
}

I modified the code to add [] to local_ip and the interfaces found.

My questions are:
is it a bug or is my wrong configuration?
Can You help me?

thank's in advance!

[juha-h]

pebastega writes:

``` I modified the code to add [] to local_ip and the interfaces found. My questions are: **is it a bug or is my wrong configuration? Can You help me?**

I don't have any experience with ipv6 in sems, since I frontend sems with sip proxy that handles ipv6. If you suspect it is a bug in sems, please submit a pull request to fix it. Make sure that it does not change anything when ipv4 addresses are used.

…

-- Juha