使用指定的以太网IP地址进行HTTP请求。

huangapple
go评论136阅读模式
英文:

make http request with a specified ethernet ip

问题

我在我的机器上有几个公共IP地址。我想指定使用哪一个IP地址进行请求。

我可以使用curl命令来实现：

  1. curl --interface 111.222.333.444 https://www.iplocation.net/find-ip-address | grep "Your IP address"

其中111.222.333.444是我用于向互联网发出请求的本地IP地址之一。

如何在golang中实现相同的功能？

#这个方法...

  1. package main
  3. import (
  4.     "bytes"
  5.     "fmt"
  6.     "github.com/PuerkitoBio/goquery"
  7.     "io/ioutil"
  8.     "net"
  9.     "net/http"
  10.     "os"
  11.     "time"
  12. )
  14. func main() {
  15.     var localAddr = "111.222.333.444"
  16.     localAddress, _ := net.ResolveTCPAddr("tcp", localAddr)
  18.     // 创建一个类似http.DefaultTransport的传输对象，但指定了localAddr
  19.     transport := &http.Transport{
  20.         Proxy: http.ProxyFromEnvironment,
  21.         Dial: (&net.Dialer{
  22.             Timeout:   30 * time.Second,
  23.             KeepAlive: 30 * time.Second,
  24.             LocalAddr: localAddress,
  25.         }).Dial,
  26.         TLSHandshakeTimeout: 10 * time.Second,
  27.     }
  29.     client := &http.Client{
  30.         Transport: transport,
  31.     }
  33.     response, err := client.Get("https://www.whatismyip.com/")
  35.     if err != nil {
  36.         fmt.Printf("%s", err)
  37.         os.Exit(1)
  38.     } else {
  39.         defer response.Body.Close()
  40.         contents, err := ioutil.ReadAll(response.Body)
  41.         if err != nil {
  42.             fmt.Printf("%s", err)
  43.             os.Exit(1)
  44.         }
  45.         var contentsStr = string(contents)
  46.         fmt.Printf("%s\n", contentsStr)
  47.         var doc = DocByHtmlString(contentsStr)
  49.         doc.Find("div").Each(func(i int, s *goquery.Selection) {
  50.             attr, exists := s.Attr("class")
  51.             if exists {
  52.                 if attr == "ip" {
  53.                     fmt.Println(s.Text())
  54.                     fmt.Println("expected ip is " + localAddr)
  55.                 }
  56.             }
  57.         })
  58.     }
  59. }
  61. func DocByHtmlString(html string) *goquery.Document {
  62.     doc, err := goquery.NewDocumentFromReader(bytes.NewBufferString(html))
  63.     if err != nil {
  64.         panic(err)
  65.     }
  66.     return doc
  67. }

...总是给我返回以下结果：

  1. Your IP Address Is: 555.666.777.888 // 我机器上的主IP地址
  2. expected ip is 111.222.333.444

#另一种方法

  1. package main
  3. import (
  4.     "fmt"
  5.     "io/ioutil"
  6.     "log"
  7.     "net"
  8. )
  10. func main() {
  11.     ief, err := net.InterfaceByName("eth0")
  12.     if err != nil {
  13.         log.Fatal(err)
  14.     }
  15.     addrs, err := ief.Addrs()
  16.     if err != nil {
  17.         log.Fatal(err)
  18.     }
  19.     tcpAddr := &net.TCPAddr{
  20.         IP: addrs[3].(*net.IPNet).IP,
  21.         // Port: 8080,
  22.     }
  23.     d := net.Dialer{LocalAddr: tcpAddr}
  24.     conn, err2 := d.Dial("tcp", "www.whatismyip.com:80")
  25.     if err2 != nil {
  26.         log.Fatal(err2)
  27.     }
  28.     fmt.Println(`conn.LocalAddr()`)
  29.     fmt.Println(conn.LocalAddr())
  30.     fmt.Println(`conn.RemoteAddr()`)
  31.     fmt.Println(conn.RemoteAddr())
  32.     defer conn.Close()
  33.     bytesResult, err3 := ioutil.ReadAll(conn)
  34.     if err3 != nil {
  35.         log.Fatal(err3)
  36.     }
  37.     fmt.Println(`string(bytesResult)`)
  38.     fmt.Println(string(bytesResult))
  39. }

输出结果为：

  1. conn.LocalAddr()
  2. 111.222.333.213:37036 
  3. conn.RemoteAddr()
  4. 141.101.120.15:80
  5.                      // 15秒的暂停
  6. string(bytesResult)
  7.                      // 空字符串

#ifconfig

Ubuntu 14.04.3 LTS (GNU/Linux 3.13.0-63-generic x86_64)

  1. $ ifconfig
  2. eth0      Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  3.           inet addr:111.222.333.208  Bcast:111.222.333.255  Mask:255.255.255.0
  4.           inet6 addr: de90::216:3cff:fe56:698c/64 Scope:Link
  5.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  6.           RX packets:942000 errors:0 dropped:0 overruns:0 frame:0
  7.           TX packets:336708 errors:0 dropped:0 overruns:0 carrier:0
  8.           collisions:0 txqueuelen:1000 
  9.           RX bytes:133860794 (133.8 MB)  TX bytes:84577381 (84.5 MB)
  11. eth0:0    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  12.           inet addr:111.222.333.209  Bcast:111.222.333.255  Mask:255.255.255.0
  13.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  15. eth0:1    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  16.           inet addr:111.222.333.212  Bcast:111.222.333.255  Mask:255.255.255.0
  17.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  19. eth0:2    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  20.           inet addr:111.222.333.213  Bcast:111.222.333.255  Mask:255.255.255.0
  21.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  23. eth0:3    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  24.           inet addr:111.222.333.216  Bcast:111.222.333.255  Mask:255.255.255.0
  25.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  27. eth0:4    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  28.           inet addr:111.222.333.217  Bcast:111.222.333.255  Mask:255.255.255.0
  29.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  31. eth0:5    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  32.           inet addr:111.222.333.220  Bcast:111.222.333.255  Mask:255.255.255.0
  33.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  35. eth0:6    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  36.           inet addr:111.222.333.221  Bcast:111.222.333.255  Mask:255.255.255.0
  37.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  39. eth0:7    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  40.           inet addr:111.222.333.224  Bcast:111.222.333.255  Mask:255.255.255.0
  41.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  43. eth0:8    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  44.           inet addr:111.222.333.225  Bcast:111.222.333.255  Mask:255.255.255.0
  46. lo        Link encap:Local Loopback  
  47.           inet addr:127.0.0.1  Mask:255.0.0.0
  48.           inet6 addr: ::1/128 Scope:Host
  49.           UP LOOPBACK RUNNING  MTU:65536  Metric:1
  50.           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  51.           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  52.           collisions:0 txqueuelen:0 
  53.           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
英文:

I have several public ip addresses on my machine. I want to specify which one to use for a request.

I can do it using curl:

  1. curl --interface 111.222.333.444 https://www.iplocation.net/find-ip-address | grep "Your IP address"

where 111.222.333.444 is one of my local ip addresses which I am using to make requests to the internet.

How to do the same using golang?

#This method...

  1. package main
  3. import (
  4. 	"bytes"
  5. 	"fmt"
  6. 	"github.com/PuerkitoBio/goquery"
  7. 	"io/ioutil"
  8. 	"net"
  9. 	"net/http"
  10. 	"os"
  11. 	"time"
  12. )
  14. func main() {
  15. 	var localAddr = "111.222.333.444"
  16. 	localAddress, _ := net.ResolveTCPAddr("tcp", localAddr)
  18. 	// Create a transport like http.DefaultTransport, but with a specified localAddr
  19. 	transport := &http.Transport{
  20. 		Proxy: http.ProxyFromEnvironment,
  21. 		Dial: (&net.Dialer{
  22. 			Timeout:   30 * time.Second,
  23. 			KeepAlive: 30 * time.Second,
  24. 			LocalAddr: localAddress,
  25. 		}).Dial,
  26. 		TLSHandshakeTimeout: 10 * time.Second,
  27. 	}
  29. 	client := &http.Client{
  30. 		Transport: transport,
  31. 	}
  33. 	response, err := client.Get("https://www.whatismyip.com/")
  35. 	if err != nil {
  36. 		fmt.Printf("%s", err)
  37. 		os.Exit(1)
  38. 	} else {
  39. 		defer response.Body.Close()
  40. 		contents, err := ioutil.ReadAll(response.Body)
  41. 		if err != nil {
  42. 			fmt.Printf("%s", err)
  43. 			os.Exit(1)
  44. 		}
  45. 		var contentsStr = string(contents)
  46. 		fmt.Printf("%s\n", contentsStr)
  47. 		var doc = DocByHtmlString(contentsStr)
  49. 		doc.Find("div").Each(func(i int, s *goquery.Selection) {
  50. 			attr, exists := s.Attr("class")
  51. 			if exists {
  52. 				if attr == "ip" {
  53. 					fmt.Println(s.Text())
  54. 					fmt.Println("expected ip is " + localAddr)
  55. 				}
  56. 			}
  57. 		})
  58. 	}
  59. }
  61. func DocByHtmlString(html string) *goquery.Document {
  62. 	doc, err := goquery.NewDocumentFromReader(bytes.NewBufferString(html))
  63. 	if err != nil {
  64. 		panic(err)
  65. 	}
  66. 	return doc
  67. }

... gives me always the following result:

  1. Your IP Address Is: 555.666.777.888 // main IP address on my machine
  2. expected ip is 111.222.333.444

#Another method

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"io/ioutil"
  6. 	"log"
  7. 	"net"
  8. )
  10. func main() {
  11. 	ief, err := net.InterfaceByName("eth0")
  12. 	if err != nil {
  13. 		log.Fatal(err)
  14. 	}
  15. 	addrs, err := ief.Addrs()
  16. 	if err != nil {
  17. 		log.Fatal(err)
  18. 	}
  19. 	tcpAddr := &net.TCPAddr{
  20. 		IP: addrs[3].(*net.IPNet).IP,
  21. 		// Port: 8080,
  22. 	}
  23. 	d := net.Dialer{LocalAddr: tcpAddr}
  24. 	conn, err2 := d.Dial("tcp", "www.whatismyip.com:80")
  25. 	if err2 != nil {
  26. 		log.Fatal(err2)
  27. 	}
  28. 	fmt.Println(`conn.LocalAddr()`)
  29. 	fmt.Println(conn.LocalAddr())
  30. 	fmt.Println(`conn.RemoteAddr()`)
  31. 	fmt.Println(conn.RemoteAddr())
  32. 	defer conn.Close()
  33. 	bytesResult, err3 := ioutil.ReadAll(conn)
  34. 	if err3 != nil {
  35. 		log.Fatal(err3)
  36. 	}
  37. 	fmt.Println(`string(bytesResult)`)
  38. 	fmt.Println(string(bytesResult))
  39. }

gives output

  1. conn.LocalAddr()
  2. 111.222.333.213:37036 
  3. conn.RemoteAddr()
  4. 141.101.120.15:80
  5.                      // 15 seconds pause
  6. string(bytesResult)
  7.                      // empty string

#ifcongif

Ubuntu 14.04.3 LTS (GNU/Linux 3.13.0-63-generic x86_64)

  1. $ ifconfig
  2. eth0      Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  3.           inet addr:111.222.333.208  Bcast:111.222.333.255  Mask:255.255.255.0
  4.           inet6 addr: de90::216:3cff:fe56:698c/64 Scope:Link
  5.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  6.           RX packets:942000 errors:0 dropped:0 overruns:0 frame:0
  7.           TX packets:336708 errors:0 dropped:0 overruns:0 carrier:0
  8.           collisions:0 txqueuelen:1000 
  9.           RX bytes:133860794 (133.8 MB)  TX bytes:84577381 (84.5 MB)
  11. eth0:0    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  12.           inet addr:111.222.333.209  Bcast:111.222.333.255  Mask:255.255.255.0
  13.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  15. eth0:1    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  16.           inet addr:111.222.333.212  Bcast:111.222.333.255  Mask:255.255.255.0
  17.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  19. eth0:2    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  20.           inet addr:111.222.333.213  Bcast:111.222.333.255  Mask:255.255.255.0
  21.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  23. eth0:3    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  24.           inet addr:111.222.333.216  Bcast:111.222.333.255  Mask:255.255.255.0
  25.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  27. eth0:4    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  28.           inet addr:111.222.333.217  Bcast:111.222.333.255  Mask:255.255.255.0
  29.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  31. eth0:5    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  32.           inet addr:111.222.333.220  Bcast:111.222.333.255  Mask:255.255.255.0
  33.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  35. eth0:6    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  36.           inet addr:111.222.333.221  Bcast:111.222.333.255  Mask:255.255.255.0
  37.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  39. eth0:7    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  40.           inet addr:111.222.333.224  Bcast:111.222.333.255  Mask:255.255.255.0
  41.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  43. eth0:8    Link encap:Ethernet  HWaddr 00:18:3c:96:69:8c  
  44.           inet addr:111.222.333.225  Bcast:111.222.333.255  Mask:255.255.255.0
  45.           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  47. lo        Link encap:Local Loopback  
  48.           inet addr:127.0.0.1  Mask:255.0.0.0
  49.           inet6 addr: ::1/128 Scope:Host
  50.           UP LOOPBACK RUNNING  MTU:65536  Metric:1
  51.           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  52.           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  53.           collisions:0 txqueuelen:0 
  54.           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

答案1

得分: 3

谢谢 @JimB。工作解决方案：

  1. package main
  3. import (
  4. 	"bytes"
  5. 	"fmt"
  6. 	"github.com/PuerkitoBio/goquery"
  7. 	"io/ioutil"
  8. 	"log"
  9. 	"net"
  10. 	"net/http"
  11. 	"os"
  12. 	"time"
  13. )
  15. func main() {
  16. 	ief, err := net.InterfaceByName("eth0")
  17. 	if err != nil {
  18. 		log.Fatal(err)
  19. 	}
  20. 	addrs, err := ief.Addrs()
  21. 	if err != nil {
  22. 		log.Fatal(err)
  23. 	}
  24. 	tcpAddr := &net.TCPAddr{
  25. 		IP: addrs[3].(*net.IPNet).IP, // 选择第3个IP地址
  26. 	}
  27. 	d := net.Dialer{LocalAddr: tcpAddr}
  28. 	conn, err2 := d.Dial("tcp", "www.whatismyip.com:80")
  29. 	if err2 != nil {
  30. 		log.Fatal(err2)
  31. 	}
  32. 	fmt.Println(`conn.LocalAddr()`)
  33. 	fmt.Println(conn.LocalAddr())
  34. 	fmt.Println(`conn.RemoteAddr()`)
  35. 	fmt.Println(conn.RemoteAddr())
  36. 	defer conn.Close()
  38. 	transport := &http.Transport{
  39. 		Proxy:               http.ProxyFromEnvironment,
  40. 		Dial:                (&net.Dialer{LocalAddr: tcpAddr}).Dial,
  41. 		TLSHandshakeTimeout: 10 * time.Second,
  42. 	}
  44. 	client := &http.Client{
  45. 		Transport: transport,
  46. 	}
  48. 	response, err := client.Get("https://www.whatismyip.com/")
  50. 	if err != nil {
  51. 		fmt.Printf("%s", err)
  52. 		os.Exit(1)
  53. 	} else {
  54. 		defer response.Body.Close()
  55. 		contents, err := ioutil.ReadAll(response.Body)
  56. 		if err != nil {
  57. 			fmt.Printf("%s", err)
  58. 			os.Exit(1)
  59. 		}
  60. 		var contentsStr = string(contents)
  61. 		fmt.Printf("%s\n", contentsStr)
  62. 		var doc = DocByHtmlString(contentsStr)
  64. 		doc.Find("div").Each(func(i int, s *goquery.Selection) {
  65. 			attr, exists := s.Attr("class")
  66. 			if exists {
  67. 				if attr == "ip" {
  68. 					fmt.Println(s.Text())
  69. 				}
  70. 			}
  71. 		})
  72. 	}
  73. }
  75. func DocByHtmlString(html string) *goquery.Document {
  76. 	doc, err := goquery.NewDocumentFromReader(bytes.NewBufferString(html))
  77. 	if err != nil {
  78. 		panic(err)
  79. 	}
  80. 	return doc
  81. }

最后打印出Your IP Address Is: 111.222.333.213，与预期一致。

英文:

Thank you @JimB. Working solution:

  1. package main
  2. import (
  3. "bytes"
  4. "fmt"
  5. "github.com/PuerkitoBio/goquery"
  6. "io/ioutil"
  7. "log"
  8. "net"
  9. "net/http"
  10. "os"
  11. "time"
  12. )
  13. func main() {
  14. ief, err := net.InterfaceByName("eth0")
  15. if err != nil {
  16. log.Fatal(err)
  17. }
  18. addrs, err := ief.Addrs()
  19. if err != nil {
  20. log.Fatal(err)
  21. }
  22. tcpAddr := &net.TCPAddr{
  23. IP: addrs[3].(*net.IPNet).IP, // Choosing ip address number 3
  24. }
  25. d := net.Dialer{LocalAddr: tcpAddr}
  26. conn, err2 := d.Dial("tcp", "www.whatismyip.com:80")
  27. if err2 != nil {
  28. log.Fatal(err2)
  29. }
  30. fmt.Println(`conn.LocalAddr()`)
  31. fmt.Println(conn.LocalAddr())
  32. fmt.Println(`conn.RemoteAddr()`)
  33. fmt.Println(conn.RemoteAddr())
  34. defer conn.Close()
  35. transport := &http.Transport{
  36. Proxy:               http.ProxyFromEnvironment,
  37. Dial:                (&net.Dialer{LocalAddr: tcpAddr}).Dial,
  38. TLSHandshakeTimeout: 10 * time.Second,
  39. }
  40. client := &http.Client{
  41. Transport: transport,
  42. }
  43. response, err := client.Get("https://www.whatismyip.com/")
  44. if err != nil {
  45. fmt.Printf("%s", err)
  46. os.Exit(1)
  47. } else {
  48. defer response.Body.Close()
  49. contents, err := ioutil.ReadAll(response.Body)
  50. if err != nil {
  51. fmt.Printf("%s", err)
  52. os.Exit(1)
  53. }
  54. var contentsStr = string(contents)
  55. fmt.Printf("%s\n", contentsStr)
  56. var doc = DocByHtmlString(contentsStr)
  57. doc.Find("div").Each(func(i int, s *goquery.Selection) {
  58. attr, exists := s.Attr("class")
  59. if exists {
  60. if attr == "ip" {
  61. fmt.Println(s.Text())
  62. }
  63. }
  64. })
  65. }
  66. }
  67. func DocByHtmlString(html string) *goquery.Document {
  68. doc, err := goquery.NewDocumentFromReader(bytes.NewBufferString(html))
  69. if err != nil {
  70. panic(err)
  71. }
  72. return doc
  73. }

Prints in the end Your IP Address Is: 111.222.333.213 as expected.

huangapple
  • 本文由 发表于 2015年9月11日 16:04:21
  • 转载请务必保留本文链接：https://go.coder-hub.com/32518539.html
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