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Support PKA and SRV DNS lookups under w32

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This commit is contained in:
Werner Koch 2009-12-07 17:11:59 +00:00
parent 198fa522d1
commit 0e7d62771d
8 changed files with 362 additions and 188 deletions
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73
common/pka.c
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@ -1,5 +1,5 @@
/* pka.c - DNS Public Key Association RR access
* Copyright (C) 2005 Free Software Foundation, Inc.
* Copyright (C) 2005, 2009 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
@ -33,6 +33,12 @@
#include <resolv.h>
#endif
#endif /* USE_DNS_PKA */
#ifdef USE_ADNS
# include <adns.h>
# ifndef HAVE_ADNS_FREE
# define adns_free free
# endif
#endif
#include "util.h"
#include "pka.h"
@ -106,6 +112,67 @@ parse_txt_record (char *buffer, unsigned char *fpr)
char *
get_pka_info (const char *address, unsigned char *fpr)
{
#ifdef USE_ADNS
int rc;
adns_state state;
const char *domain;
char *name;
adns_answer *answer = NULL;
char *buffer = NULL;
domain = strrchr (address, '@');
if (!domain || domain == address || !domain[1])
return NULL; /* Invalid mail address given. */
name = xtrymalloc (strlen (address) + 5 + 1);
if (!name)
return NULL;
memcpy (name, address, domain - address);
strcpy (stpcpy (name + (domain-address), "._pka."), domain+1);
rc = adns_init (&state, adns_if_noerrprint, NULL);
if (rc)
{
log_error ("error initializing adns: %s\n", strerror (errno));
xfree (name);
return NULL;
}
rc = adns_synchronous (state, name, adns_r_txt, adns_qf_quoteok_query,
&answer);
xfree (name);
if (rc)
{
log_error ("DNS query failed: %s\n", strerror (errno));
adns_finish (state);
return NULL;
}
if (answer->status != adns_s_ok
|| answer->type != adns_r_txt || !answer->nrrs)
{
/* log_error ("DNS query returned an error: %s (%s)\n", */
/* adns_strerror (answer->status), */
/* adns_errabbrev (answer->status)); */
adns_free (answer);
adns_finish (state);
return NULL;
}
/* We use a PKA records iff there is exactly one record. */
if (answer->nrrs == 1 && answer->rrs.manyistr[0]->i != -1)
{
buffer = xtrystrdup (answer->rrs.manyistr[0]->str);
if (parse_txt_record (buffer, fpr))
{
xfree (buffer);
buffer = NULL; /* Not a valid gpg trustdns RR. */
}
}
adns_free (answer);
adns_finish (state);
return buffer;
#else /*!USE_ADNS*/
unsigned char answer[PACKETSZ];
int anslen;
int qdcount, ancount, nscount, arcount;
@ -197,7 +264,9 @@ get_pka_info (const char *address, unsigned char *fpr)
}
return NULL;
#endif /*!USE_ADNS*/
}
#else /* !USE_DNS_PKA */
/* Dummy version of the function if we can't use the resolver
@ -247,6 +316,6 @@ main(int argc,char *argv[])
/*
Local Variables:
compile-command: "cc -DUSE_DNS_PKA -DTEST -I.. -I../include -Wall -g -o pka pka.c -lresolv libutil.a"
compile-command: "cc -DUSE_DNS_PKA -DTEST -I.. -I../include -Wall -g -o pka pka.c -lresolv ../tools/no-libgcrypt.o ../jnlib/libjnlib.a"
End:
*/