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dns_name_totext() now allows names with 0 labels, which format as "@"

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This commit is contained in:
David Lawrence 2000-07-31 23:09:49 +00:00
parent 9658892dbc
commit 051d1879fe
2 changed files with 48 additions and 17 deletions
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14
lib/dns/include/dns/name.h
View file

@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: name.h,v 1.76 2000/07/27 09:48:04 tale Exp $ */
/* $Id: name.h,v 1.77 2000/07/31 23:09:47 tale Exp $ */
#ifndef DNS_NAME_H
#define DNS_NAME_H 1
@ -873,8 +873,14 @@ dns_name_totext(dns_name_t *name, isc_boolean_t omit_final_dot,
/*
* Convert 'name' into text format, storing the result in 'target'.
*
* If 'omit_final_dot' is true, then the final '.' in absolute
* names other than the root name will be omitted.
* Notes:
* If 'omit_final_dot' is true, then the final '.' in absolute
* names other than the root name will be omitted.
*
* If dns_name_countlabels == 0, the name will be "@", representing the
* current origin as described by RFC 1035.
*
* The name is not NUL terminated.
*
* Requires:
*
@ -882,8 +888,6 @@ dns_name_totext(dns_name_t *name, isc_boolean_t omit_final_dot,
*
* 'target' is a valid buffer.
*
* dns_name_countlabels(name) > 0
*
* if dns_name_isabsolute == FALSE, then omit_final_dot == FALSE
*
* Ensures:

51
lib/dns/name.c
View file

@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: name.c,v 1.98 2000/07/27 09:46:16 tale Exp $ */
/* $Id: name.c,v 1.99 2000/07/31 23:09:49 tale Exp $ */
#include <config.h>
@ -1707,7 +1707,6 @@ dns_name_totext(dns_name_t *name, isc_boolean_t omit_final_dot,
* wire format.
*/
REQUIRE(VALID_NAME(name));
REQUIRE(name->labels > 0);
ndata = name->ndata;
nlen = name->length;
@ -1717,18 +1716,47 @@ dns_name_totext(dns_name_t *name, isc_boolean_t omit_final_dot,
trem = tlen;
/* Special handling for root label. */
if (nlen == 1 && labels == 1 && *ndata == 0) {
saw_root = ISC_TRUE;
labels = 0;
nlen = 0;
if (labels == 0 && nlen == 0) {
/*
* Special handling for an empty name.
*/
if (trem == 0)
return (ISC_R_NOSPACE);
/*
* The names of these booleans are misleading in this case.
* This empty name is not necessarily from the root node of
* the DNS root zone, nor is a final dot going to be included.
* They need to be set this way, though, to keep the "@"
* from being trounced.
*/
saw_root = ISC_TRUE;
omit_final_dot = ISC_FALSE;
*tdata++ = '@';
trem--;
/*
* Skip the while() loop.
*/
nlen = 0;
} else if (nlen == 1 && labels == 1 && *ndata == '\0') {
/*
* Special handling for the root label.
*/
if (trem == 0)
return (ISC_R_NOSPACE);
saw_root = ISC_TRUE;
omit_final_dot = ISC_FALSE;
*tdata++ = '.';
trem--;
omit_final_dot = ISC_FALSE;
/*
* Skip the while() loop.
*/
nlen = 0;
}
while (labels > 0 && nlen > 0 && trem > 0) {
labels--;
count = *ndata++;
@ -1825,7 +1853,7 @@ dns_name_totext(dns_name_t *name, isc_boolean_t omit_final_dot,
} else {
FATAL_ERROR(__FILE__, __LINE__,
"Unexpected label type %02x", count);
/* Does not return. */
/* NOTREACHED */
}
/*
@ -1842,7 +1870,7 @@ dns_name_totext(dns_name_t *name, isc_boolean_t omit_final_dot,
if (nlen != 0 && trem == 0)
return (ISC_R_NOSPACE);
INSIST(nlen == 0);
if (!saw_root || omit_final_dot)
trem++;
@ -3103,4 +3131,3 @@ dns_name_format(dns_name_t *name, char *cp, unsigned int size) {
} else
snprintf(cp, size, "<unknown>");
}