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#!/bin/bash
set -euo pipefail

if ! command -v jq >/dev/null; then
echo "Error: 'jq' is not installed. You can install it with 'brew install jq' on macOS."
exit 1
fi

if ! command -v aliyun >/dev/null; then
echo "Error: 'aliyun' CLI is not installed. See https://github.com/aliyun/aliyun-cli for installation instructions."
exit 1
fi

# https://api.aliyun.com/document/Alidns/2015-01-09/AddDomainRecord

DOMAIN_NAME="note-of-me.top"
RR=$(scutil --get LocalHostName) # Use LocalHostName as prefix
RECORD_TYPE="AAAA"

IPV6_ADDR=$(ifconfig "$(route -n get -inet6 default | awk '/interface:/ {print $2}')" |
awk '/inet6/ && !/fe80/ {print $2}' |
grep -vE 'temporary|dynamic' |
head -n1)

if [ -z "$IPV6_ADDR" ]; then
echo "[$(date '+%F %T')] No IPv6 address available"
exit 1
fi

RECORD_INFO=$(aliyun alidns DescribeSubDomainRecords \
  --SubDomain "$RR.$DOMAIN_NAME" \
  --Type "$RECORD_TYPE")

RECORD_ID=$(echo "$RECORD_INFO" | jq -r '.DomainRecords.Record[0].RecordId // empty')
RECORD_IP=$(echo "$RECORD_INFO" | jq -r '.DomainRecords.Record[0].Value // empty')

echo "[$(date '+%F %T')] Current DNS: $RECORD_IP"

if [ -n "$RECORD_ID" ]; then
if [ "$RECORD_IP" = "$IPV6_ADDR" ]; then
echo "[$(date '+%F %T')] IPv6 ($IPV6_ADDR) no changed"
    exit 0
  fi
  echo "[$(date '+%F %T')] Updating $RR.$DOMAIN_NAME: $RECORD_IP => $IPV6_ADDR"
  aliyun alidns UpdateDomainRecord \
    --RecordId "$RECORD_ID" \
 --RR "$RR" \
    --Type "$RECORD_TYPE" \
 --Value "$IPV6_ADDR" >/dev/null
else
  echo "[$(date '+%F %T')] Creating $RR.$DOMAIN_NAME => $IPV6_ADDR"
  aliyun alidns AddDomainRecord \
    --DomainName "$DOMAIN_NAME" \
 --RR "$RR" \
    --Type "$RECORD_TYPE" \
 --Value "$IPV6_ADDR" >/dev/null
fi

# Requires: aliyun CLI 已配置好账号
# 修改以下参数
$DomainName = "note-of-me.top"
$RR = $env:COMPUTERNAME  # 或 [System.Net.Dns]::GetHostName()
$RecordType = "AAAA"

# 获取 IPv6 地址
function Get-PreferredIPv6Address {
    # 获取所有候选 IPv6 地址
    $candidates = Get-NetIPAddress -AddressFamily IPv6 |
        Where-Object {
            $_.AddressState -eq "Preferred" -and
            $_.IPAddress -notmatch "^fe80" -and
            ([System.Net.IPAddress]::Parse($_.IPAddress).GetAddressBytes()[0] -band 0b11100000) -eq 0b00100000
        }

    # 优先选择 DHCP 分配的地址
    $target = $candidates |
        Where-Object { $_.PrefixOrigin -eq "Dhcp" -and $_.SuffixOrigin -eq "Dhcp" } |
        Select-Object -First 1

    if (-not $target) {
        # 其次选择 RouterAdvertisement 分配但不是随机后缀的地址
        $target = $candidates |
            Where-Object { $_.PrefixOrigin -eq "RouterAdvertisement" -and $_.SuffixOrigin -ne "Random" } |
            Select-Object -First 1
    }

    if (-not $target) {
        Write-Host "[$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss')] ❌ 未找到合适的 IPv6 地址"
        return $null
    }

    Write-Host "[$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss')] ✅ 使用 IPv6 地址: $($target.IPAddress)"
    return $target.IPAddress
}


# 获取当前记录
$ipv6Addr = Get-PreferredIPv6Address

$recordInfoRaw = & aliyun alidns DescribeSubDomainRecords `
    --SubDomain "$RR.$DomainName" `
    --Type "$RecordType"

if (-not $recordInfoRaw) {
    Write-Host "[$(Get-Date -f 'yyyy-MM-dd HH:mm:ss')] Failed to get record info"
    exit 1
}

$recordInfo = $recordInfoRaw | ConvertFrom-Json
$record = $recordInfo.DomainRecords.Record | Select-Object -First 1
$recordId = $record.RecordId
$currentIP = $record.Value

Write-Host "[$(Get-Date -f 'yyyy-MM-dd HH:mm:ss')] Current DNS: $currentIP"

if ($recordId) {
    if ($currentIP -eq $ipv6Addr) {
        Write-Host "[$(Get-Date -f 'yyyy-MM-dd HH:mm:ss')] IPv6 ($ipv6Addr) no changed"
        exit 0
    }

    Write-Host "[$(Get-Date -f 'yyyy-MM-dd HH:mm:ss')] Updating $RR.$DomainName\: $currentIP => $ipv6Addr"

    & aliyun alidns UpdateDomainRecord `
        --RecordId $recordId `
        --RR $RR `
        --Type $RecordType `
        --Value $ipv6Addr | Out-Null
} else {
    Write-Host "[$(Get-Date -f 'yyyy-MM-dd HH:mm:ss')] Creating $RR.$DomainName => $ipv6Addr"

    & aliyun alidns AddDomainRecord `
        --DomainName $DomainName `
        --RR $RR `
        --Type $RecordType `
        --Value $ipv6Addr | Out-Null
}

PS > iperf3 -c 192.168.1.2
Connecting to host 192.168.1.2, port 5201
[  5] local 192.168.1.1 port 55591 connected to 192.168.1.2 port 5201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.01   sec   117 MBytes   976 Mbits/sec
[  5]   1.01-2.01   sec   113 MBytes   944 Mbits/sec
[  5]   2.01-3.01   sec   113 MBytes   945 Mbits/sec
[  5]   3.01-4.01   sec   112 MBytes   940 Mbits/sec
[  5]   4.01-5.01   sec   113 MBytes   949 Mbits/sec
[  5]   5.01-6.01   sec   113 MBytes   946 Mbits/sec
[  5]   6.01-7.01   sec   112 MBytes   948 Mbits/sec
[  5]   7.01-8.01   sec   113 MBytes   950 Mbits/sec
[  5]   8.01-9.01   sec   113 MBytes   944 Mbits/sec
[  5]   9.01-10.01  sec   113 MBytes   944 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.01  sec  1.11 GBytes   949 Mbits/sec                  sender
[  5]   0.00-10.03  sec  1.10 GBytes   945 Mbits/sec                  receiver

iperf Done.

反向测试如下：

PS > iperf3 -c 192.168.1.2 -R
Connecting to host 192.168.1.2, port 5201
Reverse mode, remote host 192.168.1.2 is sending
[ 5] local 192.168.1.1 port 57949 connected to 192.168.1.2 port 5201
[ ID] Interval Transfer Bitrate
[ 5] 0.00-1.00 sec 113 MBytes 943 Mbits/sec
[ 5] 1.00-2.00 sec 113 MBytes 945 Mbits/sec
[ 5] 2.00-3.00 sec 113 MBytes 947 Mbits/sec
[ 5] 3.00-4.00 sec 112 MBytes 943 Mbits/sec
[ 5] 4.00-5.00 sec 113 MBytes 948 Mbits/sec
[ 5] 5.00-6.00 sec 113 MBytes 948 Mbits/sec
[ 5] 6.00-7.00 sec 113 MBytes 948 Mbits/sec
[ 5] 7.00-8.01 sec 113 MBytes 948 Mbits/sec
[ 5] 8.01-9.01 sec 113 MBytes 948 Mbits/sec
[ 5] 9.01-10.01 sec 102 MBytes 851 Mbits/sec

---

[ ID] Interval Transfer Bitrate
[ 5] 0.00-10.01 sec 1.09 GBytes 937 Mbits/sec sender
[ 5] 0.00-10.01 sec 1.09 GBytes 937 Mbits/sec receiver

iperf Done.