Download IPv6 network programming by Jun-ichiro itojun Hagino PDF

By Jun-ichiro itojun Hagino

ISBN-10: 1281039497

ISBN-13: 9781281039491

ISBN-10: 1417552735

ISBN-13: 9781417552733

This ebook comprises every little thing you must make your software software aid IPv6. IPv6 socket APIs (RFC2553) are absolutely defined with real-world examples. It covers defense, an exceptional obstacle nowadays. To safe the net infrastructure, each developer has to take a safety stance - to audit each line of code, to exploit right API and write right and safe code up to attainable. to accomplish this aim, the examples provided during this booklet are carried out with a safety stance. additionally, the booklet leads you to write down safe courses. for example, the booklet recommends opposed to using many of the IPv6 typical APIs - regrettably, there are a few IPv6 APIs which are inherently insecure, so the e-book attempts to prevent (and discourage) using such APIs. one other key factor is portability. The examples within the ebook might be appropriate to any of UNIX dependent working structures, MacOS X, and home windows XP.

* Covers the recent protocol simply followed by means of the department of security for destiny systems
* bargains with safety issues, together with junk mail and e mail, via featuring the easiest programming criteria
* absolutely describes IPv6 socket APIs (RFC2553) utilizing real-world examples
* allows portability to UNIX-based working structures, MacOS X, and home windows XP

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Open the AF_INET socket only. You will serve IPv4 clients only; IPv6 clients will get rejected. How IPv4 Traffic Gets Routed to Sockets On some of the existing operating systems, when the AF_INET6 and AF_INET listening sockets are present, IPv4 traffic gets routed to the AF_INET6 socket (using an IPv4 mapped address), not the AF_INET socket. As a result, the AF_INET socket would get no traffic. On such systems, it is critical to apply necessary access controls against an IPv4 mapped address on an AF_INET6 socket.

2 tries to connect to all addresses resolved, and uses the first one that accepts the connection. 2 shows the IPv4 dependencies. We need to get rid of these dependencies by using getaddrinfo(3), as presented in the previous section. 3. Notice that the code to handle port name/number is simplified, because getaddrinfo(3) will handle both string and numeric cases for you. Also, the socket(2)–connect(2) loop is greatly simplified, because it is now data-driven (instead of based on hardcoded logic).

Traditionally, IPv4-only programs used struct in_addr to hold IPv4 addresses. However, since the structure does not contain an identification of address family, the data is not self-contained. /* * this example is IPv4-only, and we cannot identify address family * from the data itself. foo() cannot distinguish the address * family of the given address. * inet_addr(3) is not recommended due to the lack of failure handling. = 1) { fprintf(stderr, “could not translate address\n”); exit(1); } foo(&in); Novice programmers even mistakenly use int or u_int32_t to hold IPv4 addresses.

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IPv6 network programming by Jun-ichiro itojun Hagino

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