DNS域名系统
DNS是一个分布式的数据库，主要用于吧主机名转换为IP地址。
例1，获取域名的IP
复制代码 代码示例:
#!/usr/bin/
python
import sys, socket
# 获取域名的IP地址
result = socket.getaddrinfo(sys.argv[1], None)
print result[0][4]
result = socket.getaddrinfo(sys.argv[1], None)
counter = 0
for item in result:
print '%-2d:%s' % (counter, item[4])
counter += 1
import sys, socket# 获取域名的IP地址result = socket.getaddrinfo(sys.argv[1], None)print result[0][4]result = socket.getaddrinfo(sys.argv[1], None)counter = 0for item in result: print '%-2d:%s' % (counter, item[4]) counter += 1
例2，根据IP获取域名
复制代码 代码示例:
#!/usr/bin/python
import sys, socket
try:
# 根据IP地址得到域名地址
result = socket.gethostbyaddr(sys.argv[1])
print 'Primary
hostname:'
print ' ' + result[0]
# Display the list of available addres
sed that is also returned
print 'nAddress:'
for item in result[2]:
print ' ' + item
except socket.herror, e:
print "Couldn't look up name:", e
import sys, sockettry: # 根据IP地址得到域名地址 result = socket.gethostbyaddr(sys.argv[1]) print 'Primary hostname:' print ' ' + result[0] # Display the list of available addressed that is also returned print 'nAddress:' for item in result[2]: print ' ' + itemexcept socket.herror, e: print "Couldn't look up name:", e
例3，获取网络环境信息（www.jb200.com）。
复制代码 代码示例:
#!/usr/bin/python
import sys, socket
def getipaddrs(hostname):
result = socket.getaddrinfo(hostname, None, 0, socket.SOCK_STREAM)
return [x[4][0] for x in result]
# 获取主机名称
hostname = socket.gethostname()
print 'Host name:', hostname
print 'Fully-qualified name:', socket.getfqdn(hostname)
try:
# 打印IP地址
print 'IP addressed:', ', '.join(getipaddrs(hostname))
except socket.gaierror, e:
print 'Could not get IP addressed:', e
