Am 03.07.16 um 01:34 schrieb Selva Nair: > - When the number of retries per remote exceeds a limit > (hard coded to 5), double the restart pause interval > for each additional retry per remote. > - Trigger a SIGHUP to reset the retry count when the pause > interval exceeds 1024 times the base value of restart pause. > (removed in v2 of the patch) > > The base value of restart pause is set using --connect-retry > (5 seconds by default). > > v2 changes (based on suggestions from Arne Schwabe <a...@rfc2549.org>) > > - Do not throw SIGHUP. > - Add an optional argument to "--connect-retry n [m]" where 'm' > specifies the max value of restart pause interval (default > 300 sec). > E.g., "--connect-retry 5 1800" will cause the restart pause to > scale up starting at 5 until it exceeds 1800 seconds at which > point it gets capped at 1800. > - If n == m no slow down will occur. > - While at it, fix typos and clarify the description of connect-retry-max > in the man page and Changes.rst > > Signed-off-by: Selva Nair <selva.n...@gmail.com> > --- > Changes.rst | 8 ++++++-- > doc/openvpn.8 | 19 ++++++++++++------- > src/openvpn/init.c | 8 ++++++++ > src/openvpn/options.c | 13 ++++++++++--- > src/openvpn/options.h | 1 + > 5 files changed, 37 insertions(+), 12 deletions(-) > > diff --git a/Changes.rst b/Changes.rst > index d12cdad..59722e2 100644 > --- a/Changes.rst > +++ b/Changes.rst > @@ -75,8 +75,8 @@ User-visible Changes > In --static mode connect-timeout specifies the timeout for TCP and > proxy connection establishment > > -- connect-retry now specifies the maximum number of unsucessfully > - trying all remote/connection entries before exiting. > +- connect-retry-max now specifies the maximum number of unsuccessful > + attempts of each remote/connection entry before exiting. > > - sndbuf and recvbuf default now to OS default instead of 64k > > @@ -120,6 +120,10 @@ User-visible Changes > - --http-proxy-retry and --sock-proxy-retry have been removed. Proxy > connections > will now behave like regular connection entries and generate a USR1 on > failure. > > +- --connect-retry gets a optional third argument that specifies the maximum > + time in seconds to wait between reconnection attempts when an exponential > + backoff is triggered due to repeated retries. Default = 300 seconds. > + > Maintainer-visible changes > -------------------------- > - OpenVPN no longer supports building with crypto support, but without TLS > diff --git a/doc/openvpn.8 b/doc/openvpn.8 > index 64cc934..3ca6f50 100644 > --- a/doc/openvpn.8 > +++ b/doc/openvpn.8 > @@ -462,22 +462,27 @@ application-level UDP protocols, or tunneling protocols > which don't > possess a built-in reliability layer. > .\"********************************************************* > .TP > -.B \-\-connect\-retry n > +.B \-\-connect\-retry n [max] > Wait > .B n > -seconds between connection attempts (default=5). > +seconds between connection attempts (default=5). Repeated reconnection > +attempts are slowed down after 5 retries per remote by doubling the wait > +time after each unsuccessful attempt. The optional argument > +.B max > +specifies the maximum value of wait time in seconds at which it gets > +capped (default=300). > .\"********************************************************* > .TP > .B \-\-connect\-retry\-max n > .B n > -specifies the number of times all > +specifies the number of times each > .B \-\-remote > -respectively > +or > .B <connection> > -statements are tried. Specifiying > +entry is tried. Specifying > .B n > -as one would try each entry exactly once. A sucessful connection > -resets the counter. (default=umlimited). > +as one would try each entry exactly once. A successful connection > +resets the counter. (default=unlimited). > .\"********************************************************* > .TP > .B \-\-show\-proxy\-settings > diff --git a/src/openvpn/init.c b/src/openvpn/init.c > index 498d36f..247a526 100644 > --- a/src/openvpn/init.c > +++ b/src/openvpn/init.c > @@ -1955,6 +1955,7 @@ static void > socket_restart_pause (struct context *c) > { > int sec = 2; > + int backoff = 0; > > switch (c->options.ce.proto) > { > @@ -1977,6 +1978,13 @@ socket_restart_pause (struct context *c) > sec = 10; > #endif > > + /* Slow down reconnection after 5 retries per remote */ > + backoff = (c->options.unsuccessful_attempts / > c->options.connection_list->len) - 4; > + if (backoff > 0 && sec < 1<<16) > + sec = max_int (sec, 1) << min_int (backoff, 15); > + if (sec > c->options.ce.connect_retry_seconds_max) > + sec = c->options.ce.connect_retry_seconds_max; > + > if (c->persist.restart_sleep_seconds > 0 && > c->persist.restart_sleep_seconds > sec) > sec = c->persist.restart_sleep_seconds; > else if (c->persist.restart_sleep_seconds == -1) > I think this also needs an excempt for TCP_SERVER case. I think moving the TCP_SERVER if below the exponential logic will work. Otherwise connecting just 10 times is an effect dos for a tcp server.
Arne