Resolv
Resolv类
Parent:Object
Resolv是用Ruby编写的线程感知型DNS解析器库。Resolv可以同时处理多个DNS请求，而不会阻塞整个Ruby解释器。
另请参见resolv-replace.rb，以便用Resolv替换libc解析器。
Resolv可以直接使用DNS模块查找各种DNS资源。
例子：
p Resolv.getaddress "www.ruby-lang.org"
p Resolv.getname "210.251.121.214"
Resolv::DNS.open do |dns|
ress = dns.getresources "www.ruby-lang.org", Resolv::DNS::Resource::IN::A
p ress.map(&:address)
ress = dns.getresources "ruby-lang.org", Resolv::DNS::Resource::IN::MX
p ress.map { |r| [r.exchange.to_s, r.preference] }
end
错误
- NIS不受支持。
- /etc/nsswitch.conf不受支持。
常量
AddressRegex
请使用Regexp来匹配IP地址。
DefaultResolver
用于Resolv类方法的默认解析器。
公共类方法
each_address(name, &block) Show source
遍历所有IP地址的名称。
# File lib/resolv.rb, line 57
def self.each_address(name, &block)
DefaultResolver.each_address(name, &block)
end
each_name(address, &proc) Show source
遍历所有主机名的地址。
# File lib/resolv.rb, line 78
def self.each_name(address, &proc)
DefaultResolver.each_name(address, &proc)
end
getaddress(name) Show source
查找名称的第一个IP地址。
# File lib/resolv.rb, line 43
def self.getaddress(name)
DefaultResolver.getaddress(name)
end
getaddresses(name) Show source
查找所有IP地址的名称。
# File lib/resolv.rb, line 50
def self.getaddresses(name)
DefaultResolver.getaddresses(name)
end
getname(address) Show source
查找地址的主机名。
# File lib/resolv.rb, line 64
def self.getname(address)
DefaultResolver.getname(address)
end
getnames(address) Show source
查找所有地址的主机名。
# File lib/resolv.rb, line 71
def self.getnames(address)
DefaultResolver.getnames(address)
end
new(resolvers=Hosts.new, DNS.new) Show source
使用解析器创建新的Resolv。
# File lib/resolv.rb, line 85
def initialize(resolvers=[Hosts.new, DNS.new])
@resolvers = resolvers
end
公共实例方法
each_address(name) { |name| ... } Show source
遍历所有IP地址的名称。
# File lib/resolv.rb, line 109
def each_address(name)
if AddressRegex =~ name
yield name
return
end
yielded = false
@resolvers.each {|r|
r.each_address(name) {|address|
yield address.to_s
yielded = true
}
return if yielded
}
end
each_name(address) { |name| ... } Show source
遍历所有主机名的地址。
# File lib/resolv.rb, line 144
def each_name(address)
yielded = false
@resolvers.each {|r|
r.each_name(address) {|name|
yield name.to_s
yielded = true
}
return if yielded
}
end
getaddress(name) Show source
查找名称的第一个IP地址。
# File lib/resolv.rb, line 92
def getaddress(name)
each_address(name) {|address| return address}
raise ResolvError.new("no address for #{name}")
end
getaddresses(name) Show source
查找所有IP地址的名称。
# File lib/resolv.rb, line 100
def getaddresses(name)
ret = []
each_address(name) {|address| ret << address}
return ret
end
getname(address) Show source
查找地址的主机名。
# File lib/resolv.rb, line 127
def getname(address)
each_name(address) {|name| return name}
raise ResolvError.new("no name for #{address}")
end
getnames(address) Show source
查找所有地址的主机名。
# File lib/resolv.rb, line 135
def getnames(address)
ret = []
each_name(address) {|name| ret << name}
return ret
end
