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CHAPTER 4 SOCKET NAMES AND DNS
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own devising. If, in other words, you have been in the business of interpreting addresses yourself in any form, you probably imagine that the transition to IPv6 will make you write even more complicated code than you already have. Fear not: my actual recommendation is that you get out of address interpretation or scanning altogether, and the next section will show you how!
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To make your code simple, powerful, and immune from the complexities of the transition from IPv4 to IPv6, you should turn your attention to one of the most powerful tools in the Python socket user's arsenal: getaddrinfo(). The getaddrinfo() function sits in the socket module along with most other operations that involve addresses (rather than being a socket method). Unless you are doing something specialized, it is probably the only routine that you will ever need to transform the hostnames and port numbers that your users specify into addresses that can be used by socket methods! Its approach is simple: rather than making you attack the addressing problem piecemeal, which is necessary when using the older routines in the socket module, it lets you specify everything you know about the connection that you need to make in a single call. In response, it returns all of the coordinates we discussed earlier that are necessary for you to create and connect a socket to the named destination. Its basic use is very simple and goes like this: >>> from pprint import pprint >>> infolist = socket.getaddrinfo('gatech.edu', 'www') >>> pprint(infolist) [(2, 1, 6, '', ('130.207.244.244', 80)), (2, 2, 17, '', ('130.207.244.244', 80))] >>> ftpca = infolist[0] >>> ftpca[0:3] (2, 1, 6) >>> s = socket.socket(*ftpca[0:3]) >>> ftpca[4] ('130.207.244.244', 80) >>> s.connect(ftpca[4]) The variable that I have so obscurely named ftpca here is an acronym for the order of the variables that are returned: family, type, protocol, canonical name, and address, which contain everything you need to make a connection. Here, we have asked about the possible methods for connecting to the HTTP port of the host gatech.edu, and have been told that there are two ways to do it: by creating a SOCK_STREAM socket (socket type 1) that uses IPPROTO_TCP (protocol number 6) or else by using a SOCK_DGRAM (socket type 2) socket with IPPROTO_UDP (which is the protocol represented by the integer17). And, yes, the foregoing answer is indicative of the fact that HTTP officially supports both TCP and UDP, at least according to the official organization that doles out port numbers (and that gave HTTP one of each). Usually when calling getaddrinfo(), you will specify which kind of socket you want rather than leaving the answer up to chance! If you use getaddrinfo() in your code, then unlike the listings in 2 and 3 which used real symbols like AF_INET just to make it clearer how the low-level socket mechanisms were working your production Python code might not even have to reference any symbols at all from the socket module except for those that explain to getaddrinfo() which kind of address you want. Instead, you will use the first three items in the getaddrinfo() return value as the arguments to the socket() constructor, and then use the fifth item as the address to any of the calls listed in the first section of this chapter. As you can see from the foregoing code snippet, getaddrinfo() generally allows not only the hostname but also the port name to be a symbol rather than an integer eliminating the need of older
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CHAPTER 4 SOCKET NAMES AND DNS
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Python code to make extra calls if the user might want to provide a symbolic port number like www or smtp instead of 80 or 25.
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