By Jun-ichiro itojun Hagino
This ebook comprises every little thing you must make your software software aid IPv6. IPv6 socket APIs (RFC2553) are totally defined with real-world examples. It covers safety, a superb trouble 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 ebook leads you to put in writing safe courses. for example, the publication recommends opposed to using a few of the IPv6 normal APIs - regrettably, there are a few IPv6 APIs which are inherently insecure, so the ebook attempts to prevent (and discourage) using such APIs. one other key factor is portability. The examples within the publication might be appropriate to any of UNIX established working structures, MacOS X, and home windows XP. * Covers the hot protocol simply followed via the dep. of safeguard for destiny platforms * offers with protection matters, together with junk mail and electronic mail, by means of offering the easiest programming criteria * absolutely describes IPv6 socket APIs (RFC2553) utilizing real-world examples * enables portability to UNIX-based working structures, MacOS X, and home windows XP
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Conf. conf ... conf ... 2 84 756 ?? 01 /usr/sbin/inetd -l % sudo kill -HUP 260 ... * LISTEN Note: The chargen service could be abused by malicious parties to chew up the bandwidth of your Internet connectivity. Therefore, care must be taken when your test target machine is connected to the Internet (such as filtering connection to chargen port from outside at the router). One of the defects in the previous sample program was that the program does not try to connect to all available destination addresses when the specified host name resolves to multiple IP addresses.
The strtoul(3) portion is very hard to get right. Moreover, gethostbyname(3) is not thread safe. And finally, this example does not support IPv6 at all; the code only supports IPv4. So, we switch to the getaddrinfo(3) function. getaddrinfo(3) will translate FQDN and numeric representation of host name and will also deal with port name/number. getaddrinfo(3) also fills in arguments to be passed to socket(2) and bind(2) calls and makes our program more data-driven (rather than hardcoded logic). Of course, getaddrinfo(3) deals with IPv6 addresses.
Client by gethostby* (IPv4 only) * by Jun-ichiro itojun Hagino. in public domain. c: Updated program to connect to all the addresses returned by DNS address resolution, instead of the first one returned. /* * client by gethostby*, multiple address support (IPv4 only) * by Jun-ichiro itojun Hagino. in public domain. c: Make the program address-family independent. /* * client by getaddrinfo (multi-protocol support) * by Jun-ichiro itojun Hagino. in public domain. c: TCP server invoked from inetd(8).
IPv6 Network Programming by Jun-ichiro itojun Hagino