Skip to content

intra/tcp.go: don't create TCP endpoint before Dial() returns #149

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
ignoramous merged 2 commits into from
Aug 17, 2025
Merged

intra/tcp.go: don't create TCP endpoint before Dial() returns #149

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
fa57a93
intra/tcp.go: don't create TCP endpoint before Dial() returns
Lanius-collaris Apr 29, 2025
8b5e5e6
Update intra/tcp.go
Lanius-collaris May 13, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
25 changes: 16 additions & 9 deletions intra/tcp.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -186,17 +186,18 @@ func (h *tcpHandler) Proxy(gconn *netstack.GTCPConn, src, target netip.AddrPort)
return deny
}

// handshake; since we assume a duplex-stream from here on
if open, err = gconn.Establish(); !open {
log.E("tcp: %s connect err %v; %s => %s for %s", cid, err, src, target, uid)
clos(gconn)
h.queueSummary(smm.done(err))
return deny // == !open
}

if isAnyBasePid(pids) { // see udp.go:Connect
if h.dnsOverride(gconn, target, uid) {
if target.IsValid() && h.resolver.IsDnsAddr(target) {
// SocketSummary not sent; x.DNSSummary supercedes it
if _, err := gconn.Establish(); err != nil {
clos(gconn)
h.queueSummary(smm.done(err))
return deny // == !open
}
// conn closed by the resolver
core.Gx(h.proto+".dns", func() {
h.resolver.Serve(h.proto, gconn, uid)
})
return allow
} // else not a dns request
} // if ipn.Exit then let it connect as-is (aka exit)
Expand Down Expand Up @@ -270,6 +271,12 @@ func (h *tcpHandler) handle(px ipn.Proxy, src net.Conn, boundSrc, target netip.A
return err
}

gconn := src.(*netstack.GTCPConn)
if _, err := gconn.Establish(); err != nil {
clos(pc)
return err
}

core.Go("tcp.forward."+smm.ID, func() {
h.forward(src, rwext{dst, tcptimeout}, smm) // src always *gonet.TCPConn
})
Expand Down
Loading