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(getnameinfo_verified): handle the case of forward but no backward DNS

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information, and also describe the desired behaviour.  from Love
<lha@stacken.kth.se>


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@11395 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Assar Westerlund
2002-09-05 01:36:27 +00:00
parent 231892e586
commit f1feda412e
1 changed files with 12 additions and 3 deletions
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15
lib/roken/getnameinfo_verified.c
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@@ -1,5 +1,5 @@
/* /*
* Copyright (c) 1999 - 2001 Kungliga Tekniska H<>gskolan * Copyright (c) 1999 - 2002 Kungliga Tekniska H<>gskolan
* (Royal Institute of Technology, Stockholm, Sweden). * (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved. * All rights reserved.
* *
@@ -38,6 +38,14 @@ RCSID("$Id$");
#include "roken.h" #include "roken.h"
/*
* Try to obtain a verified name for the address in `sa, salen' (much
* similar to getnameinfo).
* Verified in this context means that forwards and backwards lookups
* in DNS are consistent. If that fails, return an error if the
* NI_NAMEREQD flag is set or return the numeric address as a string.
*/
int int
getnameinfo_verified(const struct sockaddr *sa, socklen_t salen, getnameinfo_verified(const struct sockaddr *sa, socklen_t salen,
char *host, size_t hostlen, char *host, size_t hostlen,
@@ -60,13 +68,13 @@ getnameinfo_verified(const struct sockaddr *sa, socklen_t salen,
ret = getnameinfo (sa, salen, host, hostlen, serv, servlen, ret = getnameinfo (sa, salen, host, hostlen, serv, servlen,
flags | NI_NUMERICSERV); flags | NI_NUMERICSERV);
if (ret) if (ret)
return ret; goto fail;
memset (&hints, 0, sizeof(hints)); memset (&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_STREAM; hints.ai_socktype = SOCK_STREAM;
ret = getaddrinfo (host, serv, &hints, &ai); ret = getaddrinfo (host, serv, &hints, &ai);
if (ret) if (ret)
return ret; goto fail;
for (a = ai; a != NULL; a = a->ai_next) { for (a = ai; a != NULL; a = a->ai_next) {
if (a->ai_addrlen == salen if (a->ai_addrlen == salen
&& memcmp (a->ai_addr, sa, salen) == 0) { && memcmp (a->ai_addr, sa, salen) == 0) {
@@ -75,6 +83,7 @@ getnameinfo_verified(const struct sockaddr *sa, socklen_t salen,
} }
} }
freeaddrinfo (ai); freeaddrinfo (ai);
fail:
if (flags & NI_NAMEREQD) if (flags & NI_NAMEREQD)
return EAI_NONAME; return EAI_NONAME;
ret = getnameinfo (sa, salen, host, hostlen, serv, servlen, ret = getnameinfo (sa, salen, host, hostlen, serv, servlen,