Read e-book online IPv6 network programming PDF

By Jun-ichiro itojun Hagino

ISBN-10: 1281039497

ISBN-13: 9781281039491

ISBN-10: 1417552735

ISBN-13: 9781417552733

This booklet comprises every thing you must make your program application help IPv6. IPv6 socket APIs (RFC2553) are totally defined with real-world examples. It covers safeguard, a very good predicament nowadays. To safe the web 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 objective, the examples awarded 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 a few of the IPv6 normal APIs - regrettably, there are a few IPv6 APIs which are inherently insecure, so the booklet attempts to prevent (and discourage) using such APIs. one other key factor is portability. The examples within the ebook will be acceptable to any of UNIX dependent working platforms, MacOS X, and home windows XP.

* Covers the recent protocol simply followed by way of the dep. of security for destiny systems
* offers with protection issues, together with junk mail and e-mail, by means of providing the simplest programming criteria
* absolutely describes IPv6 socket APIs (RFC2553) utilizing real-world examples
* makes it possible for portability to UNIX-based working platforms, MacOS X, and home windows XP

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Extra info for IPv6 network programming

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This way your application will be vulnerable to various attacks. ■ Open the AF_INET6 socket only, and reject any traffic from an IPv4 mapped address. By doing so, you will serve IPv6 clients only; IPv4 clients will get rejected. ■ 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.

We always have to specify sockaddr_in6 to identify an IPv6 peer. 2 Translating Text Representation into sockaddrs To get sockaddrs from a given string host name (either FQDN or numeric), we have been using gethostbyname(3), inet_aton(3), and inet_pton(3). We also used getservbyname(3) and strtoul(3)1 to grab a port number. /* * NOTE: in FQDN case, foo() gets the first address on the DNS database. = 1) { fprintf(stderr, “%s: invalid hostname\n”); exit(1); /*NOTREACHED*/ } 1. Note: atoi(3) is not robust enough against errors; therefore, the use of atoi(3) is discouraged in this book.

3 Issues with an IPv4 Mapped Address Dut to several reasons, there are numerous portability and security issues in an IPv6 API. Some of them are due to the lack of standards; some of them are purely deployment issues. This section tries to summarize the most important security issue you will encounter: an IPv4 mapped address. Note that if you follow the guidelines presented in the previous sections, you will be able to avoid most of the problems. u (sockaddr_in). Due to the way the current standard documents are written, this behavior is a source of major security concerns.

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IPv6 network programming by Jun-ichiro itojun Hagino


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