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Re: [Openvpn-devel] [PATCH] Exec scripts at sigusr1 and established tunnel
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From: James Y. <ji...@yo...> - 2002-12-19 14:59:48
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Hi Richard,
The failover idea is interesting. I have a couple comments on the patch:
* How is --peerinit different from --ipchange?
* Shouldn't
if ( !(signal_received == SIGUSR1 && !options->sigusr1_script ) )
...
be
if (signal_received == SIGUSR1 && options->sigusr1_script)
...
?
James
Richard Mueller <mu...@te...> said:
> Hello openvpn-developers,
>
> I needed two more places in openvpn where to exec some scripts
> because I wanted to build a "fail-over" solution between two
> tuns.
>
>
> 1.) Situation:
> +---------+ tun0 (ISP0) +---------+
> | BOX 1 +----------------------+ BOX 2 |
> | | | |
> | +----------------------+ |
> +---------+ tun1 (ISP1) +---------+
>
> tun0 is prefered but if tun0 fails tun1 should do
> the job.
>
> Linux advanced routing has a usable solution for this:
> Two routing tables with one prefered.
>
> Because of this I needed to add/delete routes at this points:
>
> - After the first "answer" from the peer (add route for tun?)
> - At a SIGUSR1 == "peer dead" (del route for tun?)
>
>
> 2.) I used following configs:
>
> [BOX1: tun0]
>
> # interface configuration
> dev tun0
>
> # Peer connect configuartion
> remote 172.16.90.4
> # float
>
> persist-tun
> persist-key
> ping 7
> ping-restart 21
>
> # 10.255.253.8 is our local VPN endpoint
> # 10.255.253.9 is our remote VPN endpoint
> ifconfig 10.255.254.122 10.255.254.121
>
> # TSL-Client
> tls-client
> ca /etc/openvpn/certs/ca.crt
> cert /etc/openvpn/certs/box1.crt
> key /etc/openvpn/certs/box1.key
> tls-verify "/usr/local/sbin/verify-cn box2"
>
> # Routen setzen
> peerinit /etc/openvpn/scripts/tun0.up
> sigusr1 /etc/openvpn/scripts/tun0.down
>
> lport 5006
> rport 5007
>
> comp-lzo
> #daemon
>
> reneg-sec 600
>
> verb 5
>
> [BOX1: tun1]
>
> # interface configuration
> dev tun1
>
> # Peer connect configuartion
> remote 172.16.90.4
> # float
>
> persist-tun
> persist-key
> ping 7
> ping-restart 21
>
> # 10.255.253.8 is our local VPN endpoint
> # 10.255.253.9 is our remote VPN endpoint
> ifconfig 10.255.253.122 10.255.253.121
>
> # TSL-Client
> tls-client
> ca /etc/openvpn/certs/ca.crt
> cert /etc/openvpn/certs/box1.crt
> key /etc/openvpn/certs/box1.key
> tls-verify "/usr/local/sbin/verify-cn box2"
>
> # Routen setzen
> peerinit /etc/openvpn/scripts/tun1.up
> sigusr1 /etc/openvpn/scripts/tun1.down
>
> lport 5506
> rport 5507
>
> comp-lzo
> #daemon
>
> reneg-sec 600
>
> verb 5
>
> [BOX2: tun0]
>
> # interface configuration
> dev tun0
>
> # Peer connect configuartion
> remote 172.16.90.1
> # float
>
> persist-tun
> persist-key
> ping 7
> ping-restart 21
>
> ifconfig 10.255.254.121 10.255.254.122
>
> # TSL-Client
> tls-client
> ca /etc/openvpn/certs/ca.crt
> cert /etc/openvpn/certs/box2.crt
> key /etc/openvpn/certs/box2.key
> tls-verify "/usr/local/sbin/verify-cn box1"
>
> # Routen setzen
> peerinit /etc/openvpn/scripts/tun0.up
> sigusr1 /etc/openvpn/scripts/tun0.down
>
> lport 5007
> rport 5006
>
> comp-lzo
> #daemon
>
> reneg-sec 600
>
> verb 5
>
> [BOX1: tun1]
>
> # interface configuration
> dev tun1
>
> # Peer connect configuartion
> remote 172.16.90.1
> # float
>
> persist-tun
> persist-key
> ping 7
> ping-restart 21
>
> ifconfig 10.255.253.121 10.255.253.122
>
> # TSL-Client
> tls-client
> ca /etc/openvpn/certs/ca.crt
> cert /etc/openvpn/certs/box2.crt
> key /etc/openvpn/certs/box2.key
> tls-verify "/usr/local/sbin/verify-cn box1"
>
> peerinit /etc/openvpn/scripts/tun1.up
> sigusr1 /etc/openvpn/scripts/tun1.down
>
> lport 5507
> rport 5506
>
> comp-lzo
> #daemon
>
> reneg-sec 600
>
> verb 5
>
> 4.) Here is the patch:
>
> [PATCH START]
> diff -u openvpn-1.3.2/openvpn.c openvpn-1.3.2-droute/openvpn.c
> --- openvpn-1.3.2/openvpn.c Mon Oct 21 03:46:52 2002
> +++ openvpn-1.3.2-droute/openvpn.c Wed Dec 18 19:18:12 2002
> @@ -341,7 +341,7 @@
> options->local_port, options->remote_port,
> options->bind_local, options->remote_float,
> options->inetd,
> - udp_socket_addr, options->ipchange,
> + udp_socket_addr, options->ipchange,
options->peerinit_script,
> options->resolve_retry_seconds);
>
> #ifdef USE_CRYPTO
> @@ -1406,6 +1406,15 @@
> run_script (options->down_script, tuntap_actual, MAX_RW_SIZE_TUN
(&frame),
> max_rw_size_udp, options->ifconfig_local,
options->ifconfig_remote);
> }
> + /*
> + * Execute sigusr1 script
> + */
> + if ( !(signal_received == SIGUSR1 && !options->sigusr1_script ) )
> + {
> + msg (M_INFO, "Executing sigusr1 script %s",options->sigusr1_script);
> + system_check (options->sigusr1_script, "sigusr1 command failed", false);
> + }
> +
> done:
> /* pop our garbage collection level */
> gc_free_level (gc_level);
> diff -u openvpn-1.3.2/options.c openvpn-1.3.2-droute/options.c
> --- openvpn-1.3.2/options.c Sat Oct 19 23:26:11 2002
> +++ openvpn-1.3.2-droute/options.c Wed Dec 18 18:52:24 2002
> @@ -316,6 +316,9 @@
> SHOW_STR (writepid);
> SHOW_STR (up_script);
> SHOW_STR (down_script);
> + SHOW_STR (peerinit_script);
> + SHOW_STR (sigusr1_script);
> + SHOW_STR (down_script);
> SHOW_BOOL (daemon);
> SHOW_BOOL (inetd);
> SHOW_INT (nice);
> @@ -726,6 +729,16 @@
> {
> ++i;
> options->down_script = p2;
> + }
> + else if (streq(p1, "peerinit") && p2)
> + {
> + ++i;
> + options->peerinit_script = p2;
> + }
> + else if (streq(p1, "sigusr1") && p2)
> + {
> + ++i;
> + options->sigusr1_script = p2;
> }
> else if (streq (p1, "daemon"))
> {
> diff -u openvpn-1.3.2/options.h openvpn-1.3.2-droute/options.h
> --- openvpn-1.3.2/options.h Sat Oct 19 22:25:46 2002
> +++ openvpn-1.3.2-droute/options.h Wed Dec 18 18:25:46 2002
> @@ -87,6 +87,8 @@
> const char *writepid;
> const char *up_script;
> const char *down_script;
> + const char *peerinit_script;
> + const char *sigusr1_script;
> bool daemon;
> bool inetd;
> int nice;
> diff -u openvpn-1.3.2/socket.c openvpn-1.3.2-droute/socket.c
> --- openvpn-1.3.2/socket.c Sat Oct 19 23:23:19 2002
> +++ openvpn-1.3.2-droute/socket.c Wed Dec 18 18:56:18 2002
> @@ -105,6 +105,7 @@
> bool inetd,
> struct udp_socket_addr *usa,
> const char *ipchange_command,
> + const char *peerinit_command,
> int resolve_retry_seconds)
> {
> CLEAR (*sock);
> @@ -112,6 +113,7 @@
> sock->remote_float = remote_float;
> sock->addr = usa;
> sock->ipchange_command = ipchange_command;
> + sock->peerinit_command = peerinit_command;
>
> /* were we started by inetd or xinetd? */
> if (inetd)
> @@ -190,6 +192,22 @@
> sock->set_outgoing_initial = true;
> mutex_unlock (L_SOCK);
> msg (M_INFO, "Peer Connection Initiated with %s", print_sockaddr
(&usa->actual));
> +
> + if (sock->peerinit_command)
> + {
> + char command[256];
> + struct buffer out;
> +
> + msg (M_INFO, "Executing peerinit_script
%s",sock->peerinit_command);
> +
> + buf_set_write (&out, command, sizeof (command));
> + buf_printf (&out, "%s %s",
> + sock->peerinit_command,
> + print_sockaddr_ex (&usa->actual, true, " "));
> + msg (D_TLS_DEBUG, "executing ip-change command: %s", command);
> + system_check (command, "peerinit command failed", false);
> + }
> +
> if (sock->ipchange_command)
> {
> char command[256];
> diff -u openvpn-1.3.2/socket.h openvpn-1.3.2-droute/socket.h
> --- openvpn-1.3.2/socket.h Sat Oct 19 23:26:10 2002
> +++ openvpn-1.3.2-droute/socket.h Wed Dec 18 18:49:01 2002
> @@ -42,6 +42,7 @@
> bool remote_float;
> struct udp_socket_addr *addr;
> const char *ipchange_command;
> + const char *peerinit_command;
> int sd; /* file descriptor for socket */
> };
>
> @@ -56,6 +57,7 @@
> bool inetd,
> struct udp_socket_addr *addr,
> const char *ipchange_command,
> + const char *peerinit_command,
> int resolve_retry_seconds);
>
> void
> [PATCH START]
>
> 5.) If it is interesting for you, James, you are free to clean the
> code and fix the documentation and merge it in your branch.
> Just write a Creditline in the changelog. ;-)
>
> 6.) Feel free to ask, if you have some questions.
>
> bye
> richard
>
> --
> Richard Mueller mailto:mu...@te... Fon: +49 9171 896287
> Teamix GmbH http://www.teamix.de Fax: +49 9171 896286
>
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