val_getaddrinfo(3)

1val_getaddrinfo(3)            Programmer's Manual           val_getaddrinfo(3)
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NAME

6       val_getaddrinfo() - get DNSSEC-validated network address and service
7       translation
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SYNOPSIS

10         #include <validator.h>
11
12         int val_getaddrinfo(const struct val_context *ctx,
13                             const char *nodename,
14                             const char *servname,
15                             const struct addrinfo *hints,
16                             struct addrinfo **res,
17                             val_status_t * val_status);
18
19         int val_getnameinfo(val_context_t * ctx,
20                             const struct sockaddr *sa,
21                             socklen_t salen,
22                             char *host,
23                             size_t hostlen,
24                             char *serv,
25                             size_t servlen,
26                             int flags,
27                             val_status_t * val_status);
28

DESCRIPTION

30       val_getaddrinfo() and val_getnameinfo perform DNSSEC validation of DNS
31       queries.  They are intended to be DNSSEC-aware replacements for getad‐
32       drinfo(3) and getnameinfo(3).
33
34       val_getaddrinfo()  returns a network address value of type struct
35       addrinfo in the res parameter.  val_getnameinfo is used to convert a
36       sockaddr structure to a pair of host name and service strings.
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38       val_status gives the combined validation status value for all answers
39       returned by the each of the functions.  val_istrusted() and val_isvali‐
40       dated() can be used to determine the trustworthiness of data and
41       p_val_status() can be used to display the status value to the user in
42       ASCII format (See libval(3) more for information).
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44       The ctx parameter specifies the validation context, which can be set to
45       NULL for default values (see libval(3) and dnsval.conf for more details
46       on validation contexts and validation policy).
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48       The nodename, servname, and hints parameters have similar syntax and
49       semantics as the corresponding parameters for the original getad‐
50       drinfo() function.  The res parameter is similar to the res parameter
51       for getaddrinfo().  Please see the manual page for getaddrinfo(3) for
52       more details about these parameters.
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RETURN VALUES

55       The val_getaddrinfo() function returns 0 on success and a non-zero
56       error code on failure.  *res will point to a dynamically allocated
57       linked list of addrinfo structures on success and will be NULL if no
58       answer was available.
59
60       The val_status parameter gives an indication for trustworthiness of
61       data. If *res is NULL, this value gives an indication of whether the
62       non-existence of data can be trusted or not.
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EXAMPLE

65        #include <stdio.h>
66        #include <stdlib.h>
67        #include <validator.h>
68
69        int main(int argc, char *argv[])
70        {
71                 struct addrinfo *ainfo = NULL;
72                 int retval;
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74                 if (argc < 2) {
75                         printf("Usage: %s <hostname>\n", argv[0]);
76                         exit(1);
77                 }
78
79                 retval = val_getaddrinfo(NULL, argv[1], NULL, NULL, &ainfo);
80
81                 if ((retval == 0) && (ainfo != NULL)) {
82
83                         printf("Validation Status = %d [%s]\n",
84                                ainfo->ai_val_status,
85                                p_val_status(ainfo->ai_val_status));
86
87                         freeaddrinfo(ainfo);
88                 }
89
90                 return 0;
91        }
92

COPYRIGHT

94       Copyright 2004-2011 SPARTA, Inc.  All rights reserved.  See the COPYING
95       file included with the DNSSEC-Tools package for details.
96

AUTHORS

98       Abhijit Hayatnagarkar, Michael Baer
99