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.\" ========================================================================
.\"
.IX Title "val_getaddrinfo 3"
.TH val_getaddrinfo 3 "2015-04-27" "perl v5.18.4" "Programmer's Manual"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
val_getaddrinfo() \- get DNSSEC\-validated network
address and service translation
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  #include <validator/validator.h>
\&
\&  int val_getaddrinfo(const struct val_context *ctx,
\&                      const char *nodename,
\&                      const char *servname,
\&                      const struct addrinfo *hints,
\&                      struct addrinfo **res,
\&                      val_status_t * val_status);
\&
\&  int val_getnameinfo(val_context_t * ctx,
\&                      const struct sockaddr *sa,
\&                      socklen_t salen,
\&                      char *host,
\&                      size_t hostlen,
\&                      char *serv,
\&                      size_t servlen,
\&                      int flags,
\&                      val_status_t * val_status);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fI\fIval_getaddrinfo()\fI\fR and \fIval_getnameinfo\fR perform \s-1DNSSEC\s0 validation of \s-1DNS\s0
queries.  They are intended to be DNSSEC-aware replacements for
\&\fI\fIgetaddrinfo\fI\|(3)\fR and \fI\fIgetnameinfo\fI\|(3)\fR.
.PP
\&\fI\fIval_getaddrinfo()\fI\fR  returns a network address value of type \fIstruct
addrinfo\fR in the \fIres\fR parameter.  \fIval_getnameinfo\fR is used to convert a
\&\fIsockaddr\fR structure to a pair of host name and service strings.
.PP
\&\fIval_status\fR gives the combined validation status value for all
answers returned by the each of the functions.  \fI\fIval_istrusted()\fI\fR and
\&\fI\fIval_isvalidated()\fI\fR can be used to determine the trustworthiness of data and
\&\fI\fIp_val_status()\fI\fR can be used to display the status value to the user in \s-1ASCII\s0
format (See \fI\fIlibval\fI\|(3)\fR more for information).
.PP
The \fIctx\fR parameter specifies the validation context, which can be set to \s-1NULL\s0
for default values (see \fI\fIlibval\fI\|(3)\fR and \fIdnsval.conf\fR for more details on validation
contexts and validation policy).
.PP
The \fInodename\fR, \fIservname\fR, and \fIhints\fR parameters have similar
syntax and semantics as the corresponding parameters for the original
\&\fI\fIgetaddrinfo()\fI\fR function.  The \fIres\fR parameter is similar to the
\&\fIres\fR parameter for \fI\fIgetaddrinfo()\fI\fR.  Please see the manual
page for \fI\fIgetaddrinfo\fI\|(3)\fR for more details about these parameters.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The \fI\fIval_getaddrinfo()\fI\fR function returns 0 on success and a non-zero error
code on failure.  \fI*res\fR will point to a dynamically allocated linked list
of \fIaddrinfo\fR structures on success and will be \s-1NULL\s0 if no answer was
available.
.PP
The \fIval_status\fR parameter gives an indication for trustworthiness of data. If
\&\fI*res\fR is \s-1NULL,\s0 this value gives an indication of whether the non-existence of
data can be trusted or not.
.SH "EXAMPLE"
.IX Header "EXAMPLE"
.Vb 3
\& #include <stdio.h>
\& #include <stdlib.h>
\& #include <validator.h>
\&
\& int main(int argc, char *argv[])
\& {
\&          struct addrinfo *ainfo = NULL;
\&          int retval;
\&
\&          if (argc < 2) {
\&                  printf("Usage: %s <hostname>\en", argv[0]);
\&                  exit(1);
\&          }
\&
\&          retval = val_getaddrinfo(NULL, argv[1], NULL, NULL, &ainfo);
\&
\&          if ((retval == 0) && (ainfo != NULL)) {
\&
\&                  printf("Validation Status = %d [%s]\en",
\&                         ainfo\->ai_val_status,
\&                         p_val_status(ainfo\->ai_val_status));
\&
\&                  val_freeaddrinfo(ainfo);
\&          }
\&
\&          return 0;
\& }
.Ve
.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"
Abhijit Hayatnagarkar, Michael Baer
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fI\fIgetaddrinfo\fI\|(3)\fR
.PP
\&\fI\fIval_gethostbyname\fI\|(3)\fR, \fI\fIval_res_query\fI\|(3)\fR
.PP
\&\fI\fIlibval\fI\|(3)\fR
.PP
http://www.dnssec\-tools.org