{"id":208018,"date":"2025-07-08T08:10:00","date_gmt":"2025-07-08T00:10:00","guid":{"rendered":"https:\/\/server.hk\/cnblog\/208018\/"},"modified":"2025-07-08T08:10:00","modified_gmt":"2025-07-08T00:10:00","slug":"go-%e7%ae%80%e5%8d%95%e7%9a%84%e5%b7%a5%e4%bd%9c%e6%b1%a0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208018\/","title":{"rendered":"go – \u7b80\u5355\u7684\u5de5\u4f5c\u6c60"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> go – \u7b80\u5355\u7684\u5de5\u4f5c\u6c60<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-27 22:21:20<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u6253\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\u300ago – \u7b80\u5355\u7684\u5de5\u4f5c\u6c60\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\u5427\uff01\u6587\u4e2d\u5185\u5bb9\u5305\u542b<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9…\u5e0c\u671b\u4f60\u80fd\u5728\u9605\u8bfb\u672c\u6587\u540e\uff0c\u80fd\u771f\u771f\u5b9e\u5b9e\u5b66\u5230\u77e5\u8bc6\u6216\u8005\u5e2e\u4f60\u89e3\u51b3\u5fc3\u4e2d\u7684\u7591\u60d1\uff0c\u4e5f\u6b22\u8fce\u5927\u4f6c\u6216\u8005\u65b0\u4eba\u670b\u53cb\u4eec\u591a\u7559\u8a00\u8bc4\u8bba\uff0c\u591a\u7ed9\u5efa\u8bae\uff01\u8c22\u8c22\uff01<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u4f5c\u4e3a go \u548c\u4e00\u822c\u7f16\u7a0b\u7684\u521d\u5b66\u8005\uff0c\u6211\u4e00\u76f4\u5728\u4f7f\u7528 gopacket \u5e93\u7f16\u5199 go \u4e2d\u7684\u7aef\u53e3\u626b\u63cf\u5668\uff0c\u5e76\u4e14\u5927\u90e8\u5206\u4ee3\u7801\u5df2\u5b8c\u6210\uff0c\u4f46\u6211\u9047\u5230\u4e86\u751f\u6210\u592a\u591a goroutine \u5e76\u83b7\u53d6\u7684\u95ee\u9898’read ip4 0.0.0.0: i\/o timeout’ \u6211\u5df2\u7ecf\u505a\u4e86\u4e00\u4e9b\u7814\u7a76\uff0c\u4f3c\u4e4e\u6211\u9700\u8981\u5b9e\u73b0\u4e00\u4e2a\u5de5\u4f5c\u6c60\u6211\u4e00\u76f4\u5728\u5c1d\u8bd5\u5b9e\u73b0\u8fd9\u4e2a\u793a\u4f8b ‘https:\/\/gobyexample.com\/worker-pools’\u56e0\u4e3a\u6211\u4ecd\u5728\u5b66\u4e60 goroutine \u548c\u901a\u9053\uff0c\u6240\u4ee5\u6211\u5df2\u7ecf\u7814\u7a76\u4e86\u51e0\u5929\u4e86\uff0c\u4f3c\u4e4e\u65e0\u6cd5\u5f04\u6e05\u695a\u5982\u4f55\u5728\u6211\u7684\u7a0b\u5e8f\u4e2d\u6b63\u786e\u5b9e\u73b0\u4e0a\u8ff0\u793a\u4f8b\uff0c\u4f60\u4eec\u80fd\u7ed9\u6211\u4e00\u4e9b\u6307\u793a\u5417\uff1f\u6216\u8005\u6700\u597d\u662f\u4e00\u4e2a\u4ee3\u7801\u4fee\u590d\u793a\u4f8b.<\/p>\n

package main\n\nimport (\n    \"fmt\"\n    \"log\"\n    \"net\"\n    \"time\"\n\n    \"github.com\/google\/gopacket\"\n    \"github.com\/google\/gopacket\/layers\"\n)\n\n\/\/ Get preferred outbound ip and port of this machine\nfunc GetOutboundIPPort() (net.IP, int) {\n    conn, err := net.Dial(\"udp\", \"1.1.1.1:80\")\n    if err != nil {\n        log.Fatal(err)\n    }\n    defer conn.Close()\n\n    localAddr := conn.LocalAddr().(*net.UDPAddr)\n    return localAddr.IP, localAddr.Port\n}\n\nfunc ipv4_gen(out chan net.IP) {\n    ip, ipnet, err := net.ParseCIDR(\"192.168.0.0\/24\")\n    if err != nil {\n        log.Fatal(err)\n    }\n    for ip := ip.Mask(ipnet.Mask); ipnet.Contains(ip); inc(ip) {\n        time.Sleep(300 * time.Millisecond)\n        dstaddrs, err := net.LookupIP(ip.String())\n        if err != nil {\n            log.Fatal(err)\n        }\n        dstip := dstaddrs[0].To4()\n        out <- dstip\n    }\n    close(out)\n}\n\nfunc inc(ip net.IP) {\n    for j := len(ip) - 1; j >= 0; j-- {\n        ip[j]++\n        if ip[j] > 0 {\n            break\n        }\n    }\n}\n\nfunc port_scanner(dstip net.IP) {\n    dstport := layers.TCPPort(80)\n\n    srcip, port := GetOutboundIPPort()\n    srcport := layers.TCPPort(port)\n\n    ip := &layers.IPv4{\n        SrcIP:    srcip,\n        DstIP:    dstip,\n        Protocol: layers.IPProtocolTCP,\n    }\n    tcp := &layers.TCP{\n        SrcPort: srcport,\n        DstPort: dstport,\n        Seq:     1105024978,\n        SYN:     true,\n        Window:  14600,\n    }\n    tcp.SetNetworkLayerForChecksum(ip)\n    buf := gopacket.NewSerializeBuffer()\n    opts := gopacket.SerializeOptions{\n        ComputeChecksums: true,\n        FixLengths:       true,\n    }\n    if err := gopacket.SerializeLayers(buf, opts, tcp); err != nil {\n        log.Fatal(err)\n    }\n\n    conn, err := net.ListenPacket(\"ip4:tcp\", \"0.0.0.0\")\n    if err != nil {\n        log.Fatal(err)\n    }\n    defer conn.Close()\n    if _, err := conn.WriteTo(buf.Bytes(), &net.IPAddr{IP: dstip}); err != nil {\n        log.Fatal(err)\n    }\n\n    \/\/ Set deadline so we don't wait forever.\n    if err := conn.SetDeadline(time.Now().Add(10 * time.Second)); err != nil {\n        log.Fatal(err)\n    }\n\n    for {\n        b := make([]byte, 4096)\n        n, addr, err := conn.ReadFrom(b)\n        if err != nil {\n            log.Println(\"error reading packet: \", err)\n            return\n        } else if addr.String() == dstip.String() {\n            \/\/ Decode a packet\n            packet := gopacket.NewPacket(b[:n], layers.LayerTypeTCP, gopacket.Default)\n            \/\/ Get the TCP layer from this packet\n            if tcpLayer := packet.Layer(layers.LayerTypeTCP); tcpLayer != nil {\n                tcp, _ := tcpLayer.(*layers.TCP)\n\n                if tcp.DstPort == srcport {\n                    if tcp.SYN && tcp.ACK {\n                        fmt.Printf(\"Discovered open port %d\/tcp on %s\\n\", dstport, dstip)\n                    }\n                    return\n                }\n            }\n        }\n    }\n}\n\nfunc worker(id int, ips <-chan net.IP) {\n    for ip := range ips {\n        go port_scanner(ip)\n    }\n}\n\nfunc main() {\n    ips := make(chan net.IP)\n    go ipv4_gen(ips)\n\n    for w := 1; w <= 10; w++ {\n        go worker(w, ips)\n    }\n}<\/pre>\n
 <\/p>\n
\u6b63\u786e\u7b54\u6848<\/h2>\n
 <\/p>\n
\u60a8\u6b63\u5728\u4e3a\u5de5\u4f5c\u4eba\u5458\u5185\u90e8\u7684\u6bcf\u9879\u5de5\u4f5c\u542f\u52a8\u4e00\u4e2a\u65b0\u7684 goroutine\uff0c\u56e0\u6b64\u5b83\u8fbe\u4e0d\u5230\u5176\u76ee\u7684\u3002
 \u60a8\u9700\u8981\u8fd0\u884c\u5de5\u4f5c\uff0c\u800c\u4e0d\u662f\u5728\u5de5\u4f5c\u7ebf\u7a0b\u4e2d\u542f\u52a8 goroutine\u3002<\/p>\n
\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300ago – \u7b80\u5355\u7684\u5de5\u4f5c\u6c60\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591aGolang\u77e5\u8bc6\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-208018","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208018","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=208018"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208018\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208018"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}