Implement `keepalive' site option, to try to keep link always up.

[secnet.git] / site.c

diff --git a/site.c b/site.c
index 9ba1a2857051787978c5dec0b1692974dcf4f136..db78d5f4ed27001d300951fa77784597096169ba 100644 (file)
--- a/site.c
+++ b/site.c
@@ -296,6 +296,7 @@ struct site {
 /* configuration information */
     string_t localname;
     string_t remotename;
+    bool_t keepalive;
     bool_t local_mobile, peer_mobile; /* Mobile client support */
     int32_t transport_peers_max;
     string_t tunname; /* localname<->remotename by default, used in logs */
@@ -1164,16 +1165,18 @@ static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
 }
 
 static void dump_packet(struct site *st, struct buffer_if *buf,
-                       const struct comm_addr *addr, bool_t incoming)
+                       const struct comm_addr *addr, bool_t incoming,
+                       bool_t ok)
 {
     uint32_t dest=get_uint32(buf->start);
     uint32_t source=get_uint32(buf->start+4);
     uint32_t msgtype=get_uint32(buf->start+8);
 
     if (st->log_events & LOG_DUMP)
-       slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:",
+       slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x: %s%s",
               st->tunname,incoming?"incoming":"outgoing",
-              dest,source,msgtype);
+              dest,source,msgtype,comm_addr_to_string(addr),
+              ok?"":" - fail");
 }
 
 static uint32_t site_status(void *st)
@@ -1427,6 +1430,9 @@ static void enter_state_run(struct site *st)
     memset(st->dhsecret,0,st->dh->len);
     memset(st->sharedsecret,0,st->sharedsecretlen);
     set_link_quality(st);
+
+    if (st->keepalive && !current_valid(st))
+       initiate_key_setup(st, "keepalive", 0);
 }
 
 static bool_t ensure_resolving(struct site *st)
@@ -1600,8 +1606,8 @@ static void generate_send_prod(struct site *st,
     slog(st,LOG_SETUP_INIT,"prodding peer for key exchange");
     st->allow_send_prod=0;
     generate_prod(st,&st->scratch);
-    dump_packet(st,&st->scratch,source,False);
-    source->comm->sendmsg(source->comm->st, &st->scratch, source);
+    bool_t ok = source->comm->sendmsg(source->comm->st, &st->scratch, source);
+    dump_packet(st,&st->scratch,source,False,ok);
 }
 
 static inline void site_settimeout(uint64_t timeout, int *timeout_io)
@@ -1734,7 +1740,7 @@ static bool_t site_incoming(void *sst, struct buffer_if *buf,
        if (!named_for_us(st,buf,msgtype,&named_msg))
            return False;
        /* It's a MSG1 addressed to us. Decide what to do about it. */
-       dump_packet(st,buf,source,True);
+       dump_packet(st,buf,source,True,True);
        if (st->state==SITE_RUN || st->state==SITE_RESOLVE ||
            st->state==SITE_WAIT) {
            /* We should definitely process it */
@@ -1784,7 +1790,7 @@ static bool_t site_incoming(void *sst, struct buffer_if *buf,
     if (msgtype==LABEL_PROD) {
        if (!named_for_us(st,buf,msgtype,&named_msg))
            return False;
-       dump_packet(st,buf,source,True);
+       dump_packet(st,buf,source,True,True);
        if (st->state!=SITE_RUN) {
            slog(st,LOG_DROP,"ignoring PROD when not in state RUN");
        } else if (current_valid(st)) {
@@ -1797,7 +1803,7 @@ static bool_t site_incoming(void *sst, struct buffer_if *buf,
     }
     if (dest==st->index) {
        /* Explicitly addressed to us */
-       if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True);
+       if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True,True);
        switch (msgtype) {
        case LABEL_NAK:
            /* If the source is our current peer then initiate a key setup,
@@ -1965,6 +1971,8 @@ static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context,
     st->localname=dict_read_string(dict, "local-name", True, "site", loc);
     st->remotename=dict_read_string(dict, "name", True, "site", loc);
 
+    st->keepalive=dict_read_bool(dict,"keepalive",False,"site",loc,False);
+
     st->peer_mobile=dict_read_bool(dict,"mobile",False,"site",loc,False);
     st->local_mobile=
        dict_read_bool(dict,"local-mobile",False,"site",loc,False);
@@ -2347,10 +2355,10 @@ void transport_xmit(struct site *st, transport_peers *peers,
     int nfailed=0;
     for (slot=0; slot<peers->npeers; slot++) {
        transport_peer *peer=&peers->peers[slot];
-       if (candebug)
-           dump_packet(st, buf, &peer->addr, False);
        bool_t ok =
            peer->addr.comm->sendmsg(peer->addr.comm->st, buf, &peer->addr);
+       if (candebug)
+           dump_packet(st, buf, &peer->addr, False, ok);
        if (!ok) {
            failed |= 1U << slot;
            nfailed++;
@@ -2372,12 +2380,14 @@ void transport_xmit(struct site *st, transport_peers *peers,
            transport_peers__copy_by_mask(peers->peers,&wslot,~failed,peers);
            assert(wslot+nfailed == peers->npeers);
            COPY_ARRAY(peers->peers+wslot, failedpeers, nfailed);
+           transport_peers_debug(st,peers,"mobile failure reorder",0,0,0);
        }
     } else {
        if (failed && peers->npeers > 1) {
            int wslot=0;
            transport_peers__copy_by_mask(peers->peers,&wslot,~failed,peers);
            peers->npeers=wslot;
+           transport_peers_debug(st,peers,"non-mobile failure cleanup",0,0,0);
        }
     }
 }