.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.29) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" .Vb 1 \& The Validator Shim Library .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The validator shim library (\fIlibval_shim.so\fR) is a shared library designed to be dynamically loaded using the '\s-1LD_PRELOAD\s0' mechanism (\fI\fIld.so\fI\|(8)\fR) supported on linux and various other unix-like platforms. The shim library implements wrappers for a number of \s-1DNS\s0 related functions and in turn calls equivalent DNSSEC-aware validating functions from \fI\fIlibval\fI\|(3)\fR, mapping the results to return codes recognized by the original functions. In this way a wide variety of applications can be made \s-1DNSSEC\s0 aware without code changes and recompilation. .PP The method of mapping return codes assumes that any 'untrusted' or failure result from the \fI\fIlibval\fI\|(3)\fR function is reflected as a failure to the original calling function. .SS "\fIUsage:\fP" .IX Subsection "Usage:" To load the library set \s-1LD_PRELOAD\s0 variable within the environment of the the target application prior to execution: .SS "\fIValidation Policy:\fP" .IX Subsection "Validation Policy:" The validator shim library will create a policy context and cache it for all subsequent \fI\fIlibval\fI\|(3)\fR calls. A \fI\s-1NULL\s0\fR policy label will be passed to create the context. The policy is chosen according to rules defined for \fI\fIlibval\fI\|(3)\fR. .PP See \fI\fIdnsval.conf\fI\|(1)\fR for information on policy labels and definition. .SS "\fILogging:\fP" .IX Subsection "Logging:" Logging for the \fI\fIlibval\fI\|(3)\fR functions may be enabled in the shim library by setting an environment variable. .PP See \fI\fIdt\-validate\fI\|(1)\fR for specifics. .SH "NOTES" .IX Header "NOTES" .SS "setuid/setgid programs" .IX Subsection "setuid/setgid programs" setuid and setgid root programs (e.g., \fI\fIping\fI\|(8)\fR) do not honor the \&\s-1LD_PRELOAD\s0 setting. These application may still use the \s-1LD_PRELOAD\s0 mechanism when run directly from a root shell. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2004\-2013 \s-1SPARTA,\s0 Inc. All rights reserved. See the \s-1COPYING\s0 file included with the dnssec-tools package for details. .SH "AUTHORS" .IX Header "AUTHORS" G. S. Marzot .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fI\fIlibsres\fI\|(3)\fR, \fI\fIlibval\fI\|(3)\fR, \fI\fIdnsval.conf\fI\|(1)\fR, \fI\fIgethostbyname\fI\|(3)\fR .PP \&\fI\fIgethostbyaddr\fI\|(3)\fR, \fI\fIgetnameinfo\fI\|(3)\fR, \fI\fIgetaddrinfo\fI\|(3)\fR, \fI\fIres_query\fI\|(3)\fR