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Commita272b09

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chore: refactor TestServer_X11 to use inproc networking
1 parent319c17d commita272b09

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3 files changed

+63
-28
lines changed

3 files changed

+63
-28
lines changed

‎agent/agentssh/agentssh.go

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -117,6 +117,10 @@ type Config struct {
117117
// Note that this is different from the devcontainers feature, which uses
118118
// subagents.
119119
ExperimentalContainersbool
120+
// X11Net allows overriding the networking implementation used for X11
121+
// forwarding listeners. When nil, a default implementation backed by the
122+
// standard library networking package is used.
123+
X11NetX11Network
120124
}
121125

122126
typeServerstruct {
@@ -196,6 +200,12 @@ func NewServer(ctx context.Context, logger slog.Logger, prometheusRegistry *prom
196200
displayOffset:*config.X11DisplayOffset,
197201
sessions:make(map[*x11Session]struct{}),
198202
connections:make(map[net.Conn]struct{}),
203+
network:func()X11Network {
204+
ifconfig.X11Net!=nil {
205+
returnconfig.X11Net
206+
}
207+
returnosNet{}
208+
}(),
199209
},
200210
}
201211

‎agent/agentssh/x11.go

Lines changed: 34 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -37,12 +37,30 @@ const (
3737
X11MaxPort=X11StartPort+X11MaxDisplays
3838
)
3939

40+
// X11Network abstracts the creation of network listeners for X11 forwarding.
41+
// It is intended mainly for testing; production code uses the default
42+
// implementation backed by the operating system networking stack.
43+
typeX11Networkinterface {
44+
Listen(network,addressstring) (net.Listener,error)
45+
}
46+
47+
// osNet is the default X11Network implementation that uses the standard
48+
// library network stack.
49+
typeosNetstruct{}
50+
51+
func (osNet)Listen(network,addressstring) (net.Listener,error) {
52+
returnnet.Listen(network,address)
53+
}
54+
4055
typex11Forwarderstruct {
4156
logger slog.Logger
4257
x11HandlerErrors*prometheus.CounterVec
4358
fs afero.Fs
4459
displayOffsetint
4560

61+
// network creates X11 listener sockets. Defaults to osNet{}.
62+
networkX11Network
63+
4664
mu sync.Mutex
4765
sessionsmap[*x11Session]struct{}
4866
connectionsmap[net.Conn]struct{}
@@ -147,26 +165,27 @@ func (x *x11Forwarder) listenForConnections(
147165
x.closeAndRemoveSession(session)
148166
}
149167

150-
tcpConn,ok:=conn.(*net.TCPConn)
151-
if!ok {
152-
x.logger.Warn(ctx,fmt.Sprintf("failed to cast connection to TCPConn. got: %T",conn))
153-
_=conn.Close()
154-
continue
168+
varoriginAddrstring
169+
varoriginPortuint32
170+
171+
iftcpConn,ok:=conn.(*net.TCPConn);ok {
172+
iftcpAddr,ok:=tcpConn.LocalAddr().(*net.TCPAddr);ok {
173+
originAddr=tcpAddr.IP.String()
174+
// #nosec G115 - Safe conversion as TCP port numbers are within uint32 range (0-65535)
175+
originPort=uint32(tcpAddr.Port)
176+
}
155177
}
156-
tcpAddr,ok:=tcpConn.LocalAddr().(*net.TCPAddr)
157-
if!ok {
158-
x.logger.Warn(ctx,fmt.Sprintf("failed to cast local address to TCPAddr. got: %T",tcpConn.LocalAddr()))
159-
_=conn.Close()
160-
continue
178+
// Fallback values for in-memory or non-TCP connections.
179+
iforiginAddr=="" {
180+
originAddr="127.0.0.1"
161181
}
162182

163183
channel,reqs,err:=serverConn.OpenChannel("x11",gossh.Marshal(struct {
164184
OriginatorAddressstring
165185
OriginatorPortuint32
166186
}{
167-
OriginatorAddress:tcpAddr.IP.String(),
168-
// #nosec G115 - Safe conversion as TCP port numbers are within uint32 range (0-65535)
169-
OriginatorPort:uint32(tcpAddr.Port),
187+
OriginatorAddress:originAddr,
188+
OriginatorPort:originPort,
170189
}))
171190
iferr!=nil {
172191
x.logger.Warn(ctx,"failed to open X11 channel",slog.Error(err))
@@ -283,13 +302,13 @@ func (x *x11Forwarder) evictLeastRecentlyUsedSession() {
283302
// createX11Listener creates a listener for X11 forwarding, it will use
284303
// the next available port starting from X11StartPort and displayOffset.
285304
func (x*x11Forwarder)createX11Listener(ctx context.Context) (ln net.Listener,displayint,errerror) {
286-
varlc net.ListenConfig
287305
// Look for an open port to listen on.
288306
forport:=X11StartPort+x.displayOffset;port<=X11MaxPort;port++ {
289307
ifctx.Err()!=nil {
290308
returnnil,-1,ctx.Err()
291309
}
292-
ln,err=lc.Listen(ctx,"tcp",fmt.Sprintf("localhost:%d",port))
310+
311+
ln,err=x.network.Listen("tcp",fmt.Sprintf("localhost:%d",port))
293312
iferr==nil {
294313
display=port-X11StartPort
295314
returnln,display,nil

‎agent/agentssh/x11_test.go

Lines changed: 19 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,6 @@ package agentssh_test
33
import (
44
"bufio"
55
"bytes"
6-
"context"
76
"encoding/hex"
87
"fmt"
98
"net"
@@ -32,10 +31,19 @@ func TestServer_X11(t *testing.T) {
3231
t.Skip("X11 forwarding is only supported on Linux")
3332
}
3433

35-
ctx:=context.Background()
34+
ctx:=testutil.Context(t,testutil.WaitShort)
3635
logger:=testutil.Logger(t)
3736
fs:=afero.NewMemMapFs()
38-
s,err:=agentssh.NewServer(ctx,logger,prometheus.NewRegistry(),fs,agentexec.DefaultExecer,&agentssh.Config{})
37+
38+
// Use in-process networking for X11 forwarding.
39+
inproc:=testutil.NewInProcNet()
40+
41+
// Create server config with custom X11 listener.
42+
cfg:=&agentssh.Config{
43+
X11Net:inproc,
44+
}
45+
46+
s,err:=agentssh.NewServer(ctx,logger,prometheus.NewRegistry(),fs,agentexec.DefaultExecer,cfg)
3947
require.NoError(t,err)
4048
defers.Close()
4149
err=s.UpdateHostSigner(42)
@@ -93,17 +101,15 @@ func TestServer_X11(t *testing.T) {
93101

94102
x11Chans:=c.HandleChannelOpen("x11")
95103
payload:="hello world"
96-
require.Eventually(t,func()bool {
97-
conn,err:=net.Dial("tcp",fmt.Sprintf("localhost:%d",agentssh.X11StartPort+displayNumber))
98-
iferr==nil {
99-
_,err=conn.Write([]byte(payload))
100-
assert.NoError(t,err)
101-
_=conn.Close()
102-
}
103-
returnerr==nil
104-
},testutil.WaitShort,testutil.IntervalFast)
104+
gofunc() {
105+
conn,err:=inproc.Dial(ctx,testutil.NewAddr("tcp",fmt.Sprintf("localhost:%d",agentssh.X11StartPort+displayNumber)))
106+
assert.NoError(t,err)
107+
_,err=conn.Write([]byte(payload))
108+
assert.NoError(t,err)
109+
_=conn.Close()
110+
}()
105111

106-
x11:=<-x11Chans
112+
x11:=testutil.RequireReceive(ctx,t,x11Chans)
107113
ch,reqs,err:=x11.Accept()
108114
require.NoError(t,err)
109115
gogossh.DiscardRequests(reqs)

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