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iamanoob
Asked: 2020-08-13 06:28:52 +0800 CST

通过特定网络接口发送请求

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我有两个网络接口wlan0和usb0一个运行 Ubuntu 的 RaspberryPi。它们都连接到互联网。

我正在编写一个 python 脚本来在wlan0. 当一个请求被发送到我的 pi 时，我将发送另一个请求到usb0，响应数据将被发送回原始请求的来源。

图片

当我尝试通过 发送测试请求时wlan0，它确实按预期工作。但是当我尝试usb0改用时，它不起作用

ifconfig输出：

eth0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether dc:a6:32:46:16:87  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 120  bytes 9012 (9.0 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 120  bytes 9012 (9.0 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.42.208  netmask 255.255.255.0  broadcast 192.168.42.255
        inet6 fe80::54e4:31ff:fe59:90d9  prefixlen 64  scopeid 0x20<link>
        ether 56:e4:31:59:90:d9  txqueuelen 1000  (Ethernet)
        RX packets 8  bytes 1428 (1.4 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 12  bytes 2008 (2.0 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.195  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::dea6:32ff:fe46:1688  prefixlen 64  scopeid 0x20<link>
        inet6 2402:800:6116:a8ae:dea6:32ff:fe46:1688  prefixlen 64  scopeid 0x0<global>
        ether dc:a6:32:46:16:88  txqueuelen 1000  (Ethernet)
        RX packets 464  bytes 57446 (57.4 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 394  bytes 65085 (65.0 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

路由表：

default via 192.168.1.1 dev wlan0
default via 192.168.1.1 dev wlan0 proto dhcp src 192.168.1.195 metric 600
192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.195
192.168.1.1 dev wlan0 proto dhcp scope link src 192.168.1.195 metric 600
192.168.42.0/24 dev usb0 proto kernel scope link src 192.168.42.208
broadcast 127.0.0.0 dev lo table local proto kernel scope link src 127.0.0.1
local 127.0.0.0/8 dev lo table local proto kernel scope host src 127.0.0.1
local 127.0.0.1 dev lo table local proto kernel scope host src 127.0.0.1
broadcast 127.255.255.255 dev lo table local proto kernel scope link src 127.0.0.1
broadcast 192.168.1.0 dev wlan0 table local proto kernel scope link src 192.168.1.195
local 192.168.1.195 dev wlan0 table local proto kernel scope host src 192.168.1.195
broadcast 192.168.1.255 dev wlan0 table local proto kernel scope link src 192.168.1.195
broadcast 192.168.42.0 dev usb0 table local proto kernel scope link src 192.168.42.208
local 192.168.42.208 dev usb0 table local proto kernel scope host src 192.168.42.208
broadcast 192.168.42.255 dev usb0 table local proto kernel scope link src 192.168.42.208
::1 dev lo proto kernel metric 256 pref medium
2402:800:6116:a8ae::/64 dev wlan0 proto ra metric 600 expires 86355sec pref medium
fe80::/64 dev wlan0 proto kernel metric 256 pref medium
fe80::/64 dev usb0 proto kernel metric 256 pref medium
default via fe80::1 dev wlan0 proto ra metric 600 expires 1755sec pref low
local ::1 dev lo table local proto kernel metric 0 pref medium
local 2402:800:6116:a8ae:dea6:32ff:fe46:1688 dev wlan0 table local proto kernel metric 0 pref medium
local fe80::54e4:31ff:fe59:90d9 dev usb0 table local proto kernel metric 0 pref medium
local fe80::dea6:32ff:fe46:1688 dev wlan0 table local proto kernel metric 0 pref medium
ff00::/8 dev wlan0 table local metric 256 pref medium
ff00::/8 dev usb0 table local metric 256 pref medium

对不起，如果我问的是一个愚蠢的问题，我对这个网络东西完全是个菜鸟......

network-interface

1 个回答

  1. Best Answer

    所以不知何故我想通了。您需要运行 curlroot或向二进制文件添加CAP_NET_RAW功能/usr/bin/curl才能使其工作。

    就我而言，我只需要以 root 权限运行我的 python 脚本，它现在就可以工作了。

    更多细节可以在https://linux.die.net/man/7/capabilities找到

    • 0

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