IPv6 Network Programming by Jun-ichiro itojun Hagino

By Jun-ichiro itojun Hagino

This booklet includes every little thing you want to make your software application aid IPv6. IPv6 socket APIs (RFC2553) are totally defined with real-world examples. It covers safety, an excellent predicament nowadays. To safe the net infrastructure, each developer has to take a safety stance - to audit each line of code, to take advantage of right API and write right and safe code up to attainable. to accomplish this aim, the examples provided during this e-book are applied with a safety stance. additionally, the ebook leads you to put in writing 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 publication attempts to prevent (and discourage) using such APIs. one other key factor is portability. The examples within the e-book might be acceptable to any of UNIX dependent working structures, MacOS X, and home windows XP. * Covers the recent protocol simply followed by way of the dep. of safety for destiny structures * bargains with protection matters, together with unsolicited mail and e mail, by means of proposing the simplest programming criteria * absolutely describes IPv6 socket APIs (RFC2553) utilizing real-world examples * allows portability to UNIX-based working platforms, MacOS X, and home windows XP

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3 series changes internal struct definition to hold sockaddr_storage, instead of struct in_addr. The structures are part of the Apache module API, so third-party Apache modules touched these structures. Therefore, the IPv6 patch for Apache makes it incompatible (in source-code level, not just binary level) with third-party modules. nl/. 1. The sample program supports IPv4 only. The program takes two arguments, host and port, and connects to the specified port on the specified host and grabs traffic from the peer.

Void foo(s, buf, siz) int s; char *buf; size_t siz; { struct sockaddr_storage ss; socklen_t sslen; sslen = sizeof(ss); recvfrom(s, buf, siz, (struct sockaddr *)&ss, &sslen); } There is another important reason for using sockaddr. Due to the scoped IPv6 addresses, the IPv6 address (128 bits) does not uniquely identify the peer. 1, from node B, we can see two nodes with fe80::1: one on Ethernet segment 1, another on Ethernet segment 2. To communicate with node A or node C, node B has to disambiguate between them with a link-local address—specifying a 128bit address is not enough—you need to specify the scope identification (in link-local case, specifying the outgoing interface is enough).

4 25 APIs We Should No Longer Use Now, we have decided to use sockaddr as our address representation. Therefore, we should not use any of the APIs that take struct in_addr or struct in6_addr, such as the following: inet_addr, inet_aton, inet_lnaof, inet_makeaddr, inet_netof, inet_network, inet_ntoa, inet_ntop, inet_pton, gethostbyname, gethostbyname2, gethostbyaddr, getservbyname, getservbyport We should never pass around struct in_addr (address) or u_int16_t/in_port_t (port number) alone. Data structures should be self-descriptive; otherwise, the caller would have trouble identifying if the address is for IPv4 or IPv6.

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