// safe wrapper around ->send
pipe_t pipe_send(pipe_t pipe, lob_t packet, link_t link)
{
if(!pipe || !packet) return NULL;
if(!pipe->send || pipe->down)
{
LOG("dropping packet to down pipe %s: %s",pipe->id, lob_json(packet));
lob_free(packet);
return pipe;
}
pipe->send(pipe, packet, link);
return pipe;
}
// encrypt and send this one packet on this pipe
link_t link_direct(link_t link, lob_t inner, pipe_t pipe)
{
if(!link || !inner) return LOG("bad args");
if(!pipe && (!link->pipes || !(pipe = link->pipes->pipe))) return LOG("no network");
// add an outgoing cid if none set
if(!lob_get_int(inner,"c")) lob_set_uint(inner,"c",e3x_exchange_cid(link->x, NULL));
pipe->send(pipe, e3x_exchange_send(link->x, inner), link);
return link;
}
// process an incoming handshake
link_t link_handshake(link_t link, lob_t inner, lob_t outer, pipe_t pipe)
{
link_t ready;
uint32_t out;
if(!link || !inner || !outer) return LOG("bad args");
if(!link->key && link_key(link->mesh,inner) != link) return LOG("invalid/mismatch handshake key");
out = exchange3_out(link->x,0);
ready = link_ready(link);
// if bad at, always send current handshake
if(exchange3_in(link->x, lob_get_int(inner,"at")) < out)
{
LOG("old/bad at: %s (%d,%d,%d)",lob_json(inner),lob_get_int(inner,"at"),exchange3_in(link->x,0),exchange3_out(link->x,0));
if(pipe) pipe->send(pipe,exchange3_handshake(link->x),link);
return NULL;
}
// trust/add this pipe
if(pipe) link_pipe(link,pipe);
// try to sync ephemeral key
if(!exchange3_sync(link->x,outer)) return LOG("sync failed");
// we may need to re-sync
if(out != exchange3_out(link->x,0)) link_sync(link);
// notify of ready state change
if(!ready && link_ready(link))
{
LOG("link ready");
mesh_link(link->mesh, link);
}
return link;
}