当设备无v6地址时连接绕过路由的双栈域名，会因为无法回落至ipv4而导致无法打开

Loukky commented 2 years ago

描述问题

如何复现

1 连接一个无ipv6地址的WiFi或者关闭数据流量的ipv6 2 在路由配置里面仅设置绕过 geoip:cn 而geosite:cn关掉 3 在设置-路由设置启用ipv6路由 4 打开一个国内的双栈域名，如：www.gov.cn 观察日志，回发现sagernet会尝试通过ipv6去连接，但由于设备没有ipv6 地址，而又不会回落至ipv4 连接，导致连接失败

调试信息

关于 -> 导出调试信息

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--------- beginning of main
I/v2ray-core: app/dispatcher: taking detour [dns-out] for [udp:172.19.0.2:53]
I/v2ray-core: proxy/dns: handling DNS traffic to tcp:dns.google
D/v2ray-core: app/dns: domain www.gov.cn will use DNS in order: [DOH//https://dns.google/dns-query]
I/v2ray-core: app/dispatcher: taking detour [dns-out] for [udp:172.19.0.2:53]
I/v2ray-core: proxy/dns: handling DNS traffic to tcp:dns.google
D/v2ray-core: app/dns: domain www.gov.cn will use DNS in order: [DOH//https://dns.google/dns-query]
D/v2ray-core: app/dns: DOH//https://dns.google/dns-query got answer: www.gov.cn -> TypeAAAA [2409:8c04:1007:a002::1:2d 2409:8c02:24c:70::ed 2409:8c20:5021:102::8000:21b 2409:8c04:1007:a002::1:14 2409:8c28:34b0:a::21e 2409:8c04:1007:a002::1:9]
D/v2ray-core: app/dns: DOH//https://dns.google/dns-query got answer: www.gov.cn -> TypeA [120.226.43.16 120.226.43.19 120.226.43.22 120.226.43.7 120.226.43.14 120.226.43.17 120.226.43.20 120.226.43.12 120.226.43.15 120.226.43.18 120.226.43.21]
D/v2ray-core: app/dispatcher: dispatch conn to tcp:[2409:8c04:1007:a002::1:2d]:80
I/v2ray-core: app/dispatcher: taking detour [bypass] for [tcp:[2409:8c04:1007:a002::1:2d]:80]
I/v2ray-core: proxy/freedom: opening connection to tcp:[2409:8c04:1007:a002::1:2d]:80
I/v2ray-core: transport/internet/tcp: dialing TCP to tcp:[2409:8c04:1007:a002::1:2d]:80
I/v2ray-core: transport/internet/tcp: dialing TCP to tcp:[2409:8c04:1007:a002::1:2d]:80
I/v2ray-core: transport/internet/tcp: dialing TCP to tcp:[2409:8c04:1007:a002::1:2d]:80
I/v2ray-core: transport/internet/tcp: dialing TCP to tcp:[2409:8c04:1007:a002::1:2d]:80
I/v2ray-core: transport/internet/tcp: dialing TCP to tcp:[2409:8c04:1007:a002::1:2d]:80
I/v2ray-core: app/proxyman/outbound: failed to process outbound traffic > proxy/freedom: failed to open connection to tcp:[2409:8c04:1007:a002::1:2d]:80 > common/retry: [network is unreachable] > common/retry: all retry attempts failed

预期行为

希望可以在ipv6 连接失败以后尝试通过ipv4 连接

屏幕截图

无

设备信息

内核版本: [4.19.157]
设备型号: [ k40s]
操作系统: [MIUI13 EU, Android12]

附加上下文

无

enfein commented 2 years ago

这个不能算 bug。大多数情况下用户知道代理服务器是否支持 IPv6，如果不支持把 IPv6 关掉就可以了。

txtyb commented 2 years ago