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client_test.go
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client_test.go
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package sshx
import (
"context"
"fmt"
"net"
"testing"
"time"
gssh "github.com/gliderlabs/ssh"
"gotest.tools/v3/assert"
"gotest.tools/v3/assert/cmp"
)
func Test_NewClient(t *testing.T) {
t.Run("run with invalid config", func(t *testing.T) {
_, err := NewClient(new(ClientConfig))
assert.ErrorContains(t, err, "invalid ssh config")
})
t.Run("run with no bridge", func(t *testing.T) {
t.Run("ok", func(t *testing.T) {
runTestingSSHServer(t, func(client *Client) {
assert.Check(t, client.Client != nil)
assert.Check(t, cmp.Nil(client.bridge))
assert.Check(t, len(client.addr) != 0)
session, err := client.NewSession()
assert.NilError(t, err)
assert.NilError(t, session.Run("foo"))
assert.Check(t, client.Close())
}, gssh.Handler(func(session gssh.Session) {
assert.Equal(t, "foo", session.RawCommand())
}))
})
t.Run("ssh server gone", func(t *testing.T) {
t.Run("dial", func(t *testing.T) {
sshListener, err := net.Listen("tcp", "")
assert.NilError(t, err)
assert.NilError(t, sshListener.Close())
client, err := NewClient(newTestingClientConfig(t, sshListener.Addr().String(), "anon"))
assert.Check(t, cmp.ErrorContains(err, "unable to dial"))
assert.Check(t, cmp.Nil(client))
})
t.Run("read / write stuck", func(t *testing.T) {
sshListener, listenerErr := net.Listen("tcp", "")
assert.NilError(t, listenerErr)
ctx, cancel := context.WithCancel(context.Background())
go func() {
conn, err := sshListener.Accept()
assert.NilError(t, err)
// block handshake by not answering anything
<-ctx.Done()
assert.Check(t, conn.Close())
}()
cfg := newTestingClientConfig(t, sshListener.Addr().String(), "anon")
cfg.SSHClientConfig.Timeout = time.Millisecond * 100
client, err := NewClient(cfg)
assert.Check(t, cmp.Nil(client))
assert.Check(t, cmp.ErrorContains(err, "unable to create client conn"))
cancel()
assert.Check(t, cmp.Nil(sshListener.Close()))
})
})
})
t.Run("run with bridges", func(t *testing.T) {
t.Run("ok", func(t *testing.T) {
var commands []string
ssh1Listener, listenerErr := net.Listen("tcp", "")
assert.NilError(t, listenerErr)
ssh2Listener, listenerErr := net.Listen("tcp", "")
assert.NilError(t, listenerErr)
ssh3Listener, listenerErr := net.Listen("tcp", "")
assert.NilError(t, listenerErr)
stopSSH1, ssh1Exited := newTestingSSHServer(t, ssh1Listener,
gssh.LocalPortForwardingCallback(func(ctx gssh.Context, host string, port uint32) bool {
hostAddr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("[%s]:%d", host, port))
assert.Check(t, err)
return ssh2Listener.Addr().String() == hostAddr.String()
}),
)
stopSSH2, ssh2Exited := newTestingSSHServer(t, ssh2Listener,
gssh.LocalPortForwardingCallback(func(ctx gssh.Context, host string, port uint32) bool {
hostAddr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("[%s]:%d", host, port))
assert.Check(t, err)
return ssh3Listener.Addr().String() == hostAddr.String()
}),
)
stopSSH3, ssh3Exited := newTestingSSHServer(t, ssh3Listener,
gssh.Handler(func(session gssh.Session) {
commands = append(commands, session.RawCommand())
}),
)
cfg := newTestingClientConfig(t, ssh3Listener.Addr().String(), "ssh3")
cfg.Bridge = newTestingClientConfig(t, ssh2Listener.Addr().String(), "ssh2")
cfg.Bridge.Bridge = newTestingClientConfig(t, ssh1Listener.Addr().String(), "ssh1")
client, err := NewClient(cfg)
assert.NilError(t, err)
session, err := client.NewSession()
assert.NilError(t, err)
assert.NilError(t, session.Run("foo"))
assert.DeepEqual(t, []string{"foo"}, commands)
assert.NilError(t, client.Close())
stopSSH3()
assert.NilError(t, <-ssh3Exited)
stopSSH2()
assert.NilError(t, <-ssh2Exited)
stopSSH1()
assert.NilError(t, <-ssh1Exited)
})
t.Run("ko", func(t *testing.T) {
t.Run("unable to create bridge", func(t *testing.T) {
ssh1Listener, listenerErr := net.Listen("tcp", "")
assert.NilError(t, listenerErr)
ssh2Listener, listenerErr := net.Listen("tcp", "")
assert.NilError(t, listenerErr)
ctx, cancel := context.WithCancel(context.Background())
go func() {
conn, err := ssh1Listener.Accept()
assert.NilError(t, err)
// block handshake by not answering anything
<-ctx.Done()
assert.Check(t, conn.Close())
}()
cfg := newTestingClientConfig(t, ssh2Listener.Addr().String(), "ssh2")
cfg.Bridge = newTestingClientConfig(t, ssh1Listener.Addr().String(), "ssh1")
cfg.Bridge.SSHClientConfig.Timeout = time.Millisecond * 100
client, err := NewClient(cfg)
assert.Check(t, cmp.Nil(client))
assert.Check(t, cmp.ErrorContains(err, "unable to create bridge"))
cancel()
assert.NilError(t, ssh2Listener.Close())
assert.NilError(t, ssh1Listener.Close())
})
t.Run("unable to create conn through bridge", func(t *testing.T) {
ssh1Listener, err := net.Listen("tcp", "")
assert.NilError(t, err)
ssh2Listener, err := net.Listen("tcp", "")
assert.NilError(t, err)
assert.Check(t, ssh2Listener.Close())
stopSSH1, ssh1Exited := newTestingSSHServer(t, ssh1Listener,
gssh.LocalPortForwardingCallback(func(gssh.Context, string, uint32) bool { return true }),
)
cfg := newTestingClientConfig(t, ssh2Listener.Addr().String(), "ssh2")
cfg.Bridge = newTestingClientConfig(t, ssh1Listener.Addr().String(), "ssh1")
client, err := NewClient(cfg)
assert.Check(t, cmp.Nil(client))
assert.Assert(t, cmp.ErrorContains(err, "unable to dial"))
assert.Check(t, cmp.Contains(err.Error(), "through bridge"))
stopSSH1()
assert.Check(t, <-ssh1Exited)
})
t.Run("unable to create conn through bridge", func(t *testing.T) {
ssh1Listener, listenerErr := net.Listen("tcp", "")
assert.NilError(t, listenerErr)
ssh2Listener, listenerErr := net.Listen("tcp", "")
assert.NilError(t, listenerErr)
stopSSH1, ssh1Exited := newTestingSSHServer(t, ssh1Listener,
gssh.LocalPortForwardingCallback(func(gssh.Context, string, uint32) bool { return true }),
)
ctx, cancel := context.WithCancel(context.Background())
go func() {
conn, err := ssh2Listener.Accept()
assert.NilError(t, err)
// block handshake by not answering anything
<-ctx.Done()
assert.Check(t, conn.Close())
}()
cfg := newTestingClientConfig(t, ssh2Listener.Addr().String(), "ssh2")
cfg.SSHClientConfig.Timeout = time.Millisecond * 100
cfg.Bridge = newTestingClientConfig(t, ssh1Listener.Addr().String(), "ssh1")
client, err := NewClient(cfg)
assert.Check(t, cmp.Nil(client))
assert.Assert(t, cmp.ErrorContains(err, "unable to create client"))
assert.Check(t, cmp.Contains(err.Error(), "through bridge"))
cancel()
stopSSH1()
assert.NilError(t, <-ssh1Exited)
assert.NilError(t, ssh2Listener.Close())
})
})
})
}
func Test_Client_Close(t *testing.T) {
t.Run("no bridge", func(t *testing.T) {
t.Run("ok", func(t *testing.T) {
runTestingSSHServer(t, func(client *Client) {
assert.NilError(t, client.Close())
})
})
t.Run("ko", func(t *testing.T) {
runTestingSSHServer(t, func(client *Client) {
assert.Check(t, client.Close())
assert.ErrorContains(t, client.Close(), "unable to close")
})
})
})
t.Run("with bridges", func(t *testing.T) {
t.Run("ok", func(t *testing.T) {
ssh1Listener, err := net.Listen("tcp", "")
assert.NilError(t, err)
ssh2Listener, err := net.Listen("tcp", "")
assert.NilError(t, err)
stopSSH1, ssh1Exited := newTestingSSHServer(t, ssh1Listener,
gssh.LocalPortForwardingCallback(func(gssh.Context, string, uint32) bool { return true }),
)
stopSSH2, ssh2Exited := newTestingSSHServer(t, ssh2Listener)
cfg := newTestingClientConfig(t, ssh2Listener.Addr().String(), "ssh2")
cfg.Bridge = newTestingClientConfig(t, ssh1Listener.Addr().String(), "ssh1")
client, err := NewClient(cfg)
assert.NilError(t, err)
assert.Check(t, client.Close())
stopSSH2()
assert.Check(t, <-ssh2Exited)
stopSSH1()
assert.Check(t, <-ssh1Exited)
})
t.Run("ko", func(t *testing.T) {
ssh1Listener, err := net.Listen("tcp", "")
assert.NilError(t, err)
ssh2Listener, err := net.Listen("tcp", "")
assert.NilError(t, err)
stopSSH1, ssh1Exited := newTestingSSHServer(t, ssh1Listener,
gssh.LocalPortForwardingCallback(func(gssh.Context, string, uint32) bool { return true }),
)
stopSSH2, ssh2Exited := newTestingSSHServer(t, ssh2Listener)
cfg := newTestingClientConfig(t, ssh2Listener.Addr().String(), "ssh2")
cfg.Bridge = newTestingClientConfig(t, ssh1Listener.Addr().String(), "ssh1")
client, err := NewClient(cfg)
assert.NilError(t, err)
assert.Check(t, client.Close())
assert.Check(t, cmp.ErrorContains(client.Close(), "use of closed network connection"))
stopSSH2()
assert.Check(t, <-ssh2Exited)
stopSSH1()
assert.Check(t, <-ssh1Exited)
})
})
}