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derp/derphttp: use SOCKS/etc proxies for derphttp dials

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Updates #227

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2020-05-12 14:00:54 -07:00 committed by Brad Fitzpatrick
parent 3663797815
commit e42ec4efba
2 changed files with 17 additions and 4 deletions
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19
derp/derphttp/derphttp_client.go
View File

@ -24,6 +24,7 @@ import (
"sync" "sync"
"time" "time"
"golang.org/x/net/proxy"
"tailscale.com/derp" "tailscale.com/derp"
"tailscale.com/net/dnscache" "tailscale.com/net/dnscache"
"tailscale.com/net/tlsdial" "tailscale.com/net/tlsdial"
@ -76,6 +77,11 @@ func NewClient(privateKey key.Private, serverURL string, logf logger.Logf) (*Cli
return c, nil return c, nil
} }
type dialer interface {
Dial(network, address string) (net.Conn, error)
DialContext(ctx context.Context, network, address string) (net.Conn, error)
}
// Connect connects or reconnects to the server, unless already connected. // Connect connects or reconnects to the server, unless already connected.
// It returns nil if there was already a good connection, or if one was made. // It returns nil if there was already a good connection, or if one was made.
func (c *Client) Connect(ctx context.Context) error { func (c *Client) Connect(ctx context.Context) error {
@ -143,14 +149,21 @@ func (c *Client) connect(ctx context.Context, caller string) (client *derp.Clien
host := c.url.Hostname() host := c.url.Hostname()
hostOrIP := host hostOrIP := host
var d net.Dialer var d dialer = new(net.Dialer)
var usingProxy bool
if cd, ok := proxy.FromEnvironmentUsing(d).(dialer); ok {
usingProxy = d != cd
d = cd
}
if c.DNSCache != nil { if c.DNSCache != nil {
ip, err := c.DNSCache.LookupIP(ctx, host) ip, err := c.DNSCache.LookupIP(ctx, host)
if err != nil { if err == nil {
hostOrIP = ip.String()
}
if err != nil && !usingProxy {
return nil, err return nil, err
} }
hostOrIP = ip.String()
} }
tcpConn, err = d.DialContext(ctx, "tcp", net.JoinHostPort(hostOrIP, urlPort(c.url))) tcpConn, err = d.DialContext(ctx, "tcp", net.JoinHostPort(hostOrIP, urlPort(c.url)))

2
go.mod
View File

@ -23,7 +23,7 @@ require (
github.com/toqueteos/webbrowser v1.2.0 github.com/toqueteos/webbrowser v1.2.0
go4.org/mem v0.0.0-20200411205429-f77f31c81751 go4.org/mem v0.0.0-20200411205429-f77f31c81751
golang.org/x/crypto v0.0.0-20200317142112-1b76d66859c6 golang.org/x/crypto v0.0.0-20200317142112-1b76d66859c6
golang.org/x/net v0.0.0-20200301022130-244492dfa37a // indirect golang.org/x/net v0.0.0-20200301022130-244492dfa37a
golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
golang.org/x/sys v0.0.0-20200501052902-10377860bb8e golang.org/x/sys v0.0.0-20200501052902-10377860bb8e