patch: rewrite bpf spec before loading to avoid bpf map lookup during runtime

[jschwinger233]

Previously we call bpf_map_lookup constantly to fetch tproxy_pid and tproxy_port, which can be done in a more efficient way by rewriting bpf spec. This PR improves this part without any functional change.

[jschwinger233]

Tested locally, CI should be green too.

[jschwinger233]

go test ./... broke but I don't think I'm the culprit.

dae $ go test -timeout 30s ./...
# github.com/daeuniverse/dae/component/outbound [github.com/daeuniverse/dae/component/outbound.test]
component/outbound/dialer_group_test.go:41:3: multiple-value dialer.NewDirectDialer(option, true) (value of type (netproxy.Dialer, *dialer.Property)) in single-value context
component/outbound/dialer_group_test.go:42:3: multiple-value dialer.NewDirectDialer(option, false) (value of type (netproxy.Dialer, *dialer.Property)) in single-value context
component/outbound/dialer_group_test.go:48:5: not enough arguments in call to NewDialerGroup
        have (*dialer.GlobalOption, string, []*dialer.Dialer, DialerSelectionPolicy, func(alive bool, networkType *dialer.NetworkType, isInit bool))
        want (*dialer.GlobalOption, string, []*dialer.Dialer, []*dialer.Annotation, DialerSelectionPolicy, func(alive bool, networkType *dialer.NetworkType, isInit bool))
component/outbound/dialer_group_test.go:81:3: multiple-value dialer.NewDirectDialer(option, false) (value of type (netproxy.Dialer, *dialer.Property)) in single-value context
component/outbound/dialer_group_test.go:82:3: multiple-value dialer.NewDirectDialer(option, false) (value of type (netproxy.Dialer, *dialer.Property)) in single-value context
component/outbound/dialer_group_test.go:83:3: multiple-value dialer.NewDirectDialer(option, false) (value of type (netproxy.Dialer, *dialer.Property)) in single-value context
component/outbound/dialer_group_test.go:84:3: multiple-value dialer.NewDirectDialer(option, false) (value of type (netproxy.Dialer, *dialer.Property)) in single-value context
component/outbound/dialer_group_test.go:85:3: multiple-value dialer.NewDirectDialer(option, false) (value of type (netproxy.Dialer, *dialer.Property)) in single-value context
component/outbound/dialer_group_test.go:86:3: multiple-value dialer.NewDirectDialer(option, false) (value of type (netproxy.Dialer, *dialer.Property)) in single-value context
component/outbound/dialer_group_test.go:87:3: multiple-value dialer.NewDirectDialer(option, false) (value of type (netproxy.Dialer, *dialer.Property)) in single-value context
component/outbound/dialer_group_test.go:87:3: too many errors
?       github.com/daeuniverse/dae      [no test files]
?       github.com/daeuniverse/dae/cmd  [no test files]
?       github.com/daeuniverse/dae/cmd/internal [no test files]
?       github.com/daeuniverse/dae/common       [no test files]
?       github.com/daeuniverse/dae/common/assets        [no test files]
?       github.com/daeuniverse/dae/common/consts        [no test files]
?       github.com/daeuniverse/dae/common/json  [no test files]
?       github.com/daeuniverse/dae/common/subscription  [no test files]
?       github.com/daeuniverse/dae/component/dns        [no test files]
?       github.com/daeuniverse/dae/component/outbound/dialer    [no test files]
?       github.com/daeuniverse/dae/component/outbound/dialer/http       [no test files]
?       github.com/daeuniverse/dae/component/outbound/dialer/juicity    [no test files]
?       github.com/daeuniverse/dae/component/outbound/dialer/shadowsocks        [no test files]
?       github.com/daeuniverse/dae/component/outbound/dialer/shadowsocksr       [no test files]
--- FAIL: TestBitList6 (0.00s)
    bitlist_test.go:29: failed to tighten 6
--- FAIL: TestBitList19 (0.00s)
    bitlist_test.go:63: failed to tighten 17
FAIL
FAIL    github.com/daeuniverse/dae/common/bitlist       0.002s
?       github.com/daeuniverse/dae/component/outbound/dialer/trojan     [no test files]
?       github.com/daeuniverse/dae/component/outbound/dialer/tuic       [no test files]
?       github.com/daeuniverse/dae/component/outbound/dialer/v2ray      [no test files]
?       github.com/daeuniverse/dae/component/outbound/transport/simpleobfs      [no test files]
?       github.com/daeuniverse/dae/component/outbound/transport/tls     [no test files]
?       github.com/daeuniverse/dae/component/outbound/transport/ws      [no test files]
?       github.com/daeuniverse/dae/component/routing    [no test files]
ok      github.com/daeuniverse/dae/common/netutils      0.033s
FAIL    github.com/daeuniverse/dae/component/outbound [build failed]
?       github.com/daeuniverse/dae/pkg/anybuffer        [no test files]
?       github.com/daeuniverse/dae/pkg/ebpf_internal    [no test files]
?       github.com/daeuniverse/dae/pkg/ebpf_internal/internal/unix      [no test files]
?       github.com/daeuniverse/dae/pkg/geodata  [no test files]
?       github.com/daeuniverse/dae/pkg/geodata/protoext [no test files]
?       github.com/daeuniverse/dae/pkg/logger   [no test files]
--- FAIL: TestSocks5 (5.00s)
    socks_test.go:53: context deadline exceeded
FAIL
FAIL    github.com/daeuniverse/dae/component/outbound/dialer/socks      5.008s
ok      github.com/daeuniverse/dae/component/routing/domain_matcher     4.269s
ok      github.com/daeuniverse/dae/component/sniffing   0.003s
ok      github.com/daeuniverse/dae/component/sniffing/internal/quicutils        0.002s
--- FAIL: TestMarshal (0.00s)
    marshal_test.go:23: permissions 0664 for '/home/gray/src/github.com/daeuniverse/dae/example.dae' are too open; requires the file is NOT writable by the same group and NOT accessible by others; suggest 0640 or
0600
FAIL
FAIL    github.com/daeuniverse/dae/config       0.003s
--- FAIL: TestPacketSniffer_Mismatched (0.00s)
    packet_sniffer_pool_test.go:56: unexpected found i.ytimg.com
FAIL
FAIL    github.com/daeuniverse/dae/control      0.005s
ok      github.com/daeuniverse/dae/pkg/config_parser    0.004s
ok      github.com/daeuniverse/dae/pkg/trie     0.002s
FAIL

Breakage can also be seen on main.

[mzz2017]

I'm in Shenzhen these days. I'll take a review on weekends as long as I'm free. Thank you!

[piyoki]

Link to #375

[jschwinger233]

@mzz2017 这个 PR 比较简单, 也不涉及功能性修改, 应该比较好 review :pitiful:

[mzz2017]

I'll take a look right now.

[mzz2017]

LGTM.

[mzz2017]

Will this approach occupy registers for a long time? According to my previous experience, using map will reduce register usage.