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Add dns_rdata_totext() and dns_rdata_fromtext() to fromwire

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Add dns_rdata_totext() and dns_rdata_fromtext() to fromwire for
valid inputs to ensure that what we accept in dns_rdata_fromwire()
can be written out and read back in.
This commit is contained in:
Mark Andrews 2019-02-27 10:21:33 +11:00
parent 961d256d73
commit 36f30f5731
1 changed files with 55 additions and 0 deletions
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55
lib/dns/tests/rdata_test.c
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@ -232,6 +232,12 @@ check_text_ok_single(const text_ok_t *text_ok, dns_rdataclass_t rdclass,
isc_buffer_init(&target, buf_totext, sizeof(buf_totext)); isc_buffer_init(&target, buf_totext, sizeof(buf_totext));
result = dns_rdata_totext(&rdata, NULL, &target); result = dns_rdata_totext(&rdata, NULL, &target);
assert_int_equal(result, ISC_R_SUCCESS); assert_int_equal(result, ISC_R_SUCCESS);
/*
* Ensure buf_totext is properly NUL terminated as dns_rdata_totext()
* may attempt different output formats writing into the apparently
* unused part of the buffer.
*/
isc_buffer_putuint8(&target, 0);
assert_string_equal(buf_totext, text_ok->text_out); assert_string_equal(buf_totext, text_ok->text_out);
/* /*
@ -250,6 +256,49 @@ check_text_ok_single(const text_ok_t *text_ok, dns_rdataclass_t rdclass,
check_struct_conversions(&rdata, structsize); check_struct_conversions(&rdata, structsize);
} }
/*
* Test whether converting rdata to text form and then parsing the result of
* that conversion again results in the same uncompressed wire form. This
* checks whether totext_*() output is parsable by fromtext_*() for given RR
* class and type.
*
* This function is called for every input RDATA which is successfully parsed
* by check_wire_ok_single() and whose type is not a meta-type.
*/
static void
check_text_conversions(dns_rdata_t *rdata) {
char buf_totext[1024] = { 0 };
unsigned char buf_fromtext[1024];
isc_result_t result;
isc_buffer_t target;
dns_rdata_t rdata2 = DNS_RDATA_INIT;
/*
* Convert uncompressed wire form RDATA into text form. This
* conversion must succeed since input RDATA was successfully
* parsed by check_wire_ok_single().
*/
isc_buffer_init(&target, buf_totext, sizeof(buf_totext));
result = dns_rdata_totext(rdata, NULL, &target);
assert_int_equal(result, ISC_R_SUCCESS);
/*
* Ensure buf_totext is properly NUL terminated as dns_rdata_totext()
* may attempt different output formats writing into the apparently
* unused part of the buffer.
*/
isc_buffer_putuint8(&target, 0);
/*
* Try parsing text form RDATA output by dns_rdata_totext() again.
*/
result = dns_test_rdatafromstring(&rdata2, rdata->rdclass, rdata->type,
buf_fromtext, sizeof(buf_fromtext),
buf_totext, false);
assert_int_equal(result, ISC_R_SUCCESS);
assert_int_equal(rdata2.length, rdata->length);
assert_memory_equal(buf_fromtext, rdata->data, rdata->length);
}
/* /*
* Test whether supplied wire form RDATA is properly handled as being either * Test whether supplied wire form RDATA is properly handled as being either
* valid or invalid for an RR of given rdclass and type. * valid or invalid for an RR of given rdclass and type.
@ -278,9 +327,15 @@ check_wire_ok_single(const wire_ok_t *wire_ok, dns_rdataclass_t rdclass,
/* /*
* If data was parsed correctly, perform two-way conversion checks * If data was parsed correctly, perform two-way conversion checks
* between uncompressed wire form and type-specific struct. * between uncompressed wire form and type-specific struct.
*
* If the RR type is not a meta-type, additionally perform two-way
* conversion checks between uncompressed wire form and text form.
*/ */
if (result == ISC_R_SUCCESS) { if (result == ISC_R_SUCCESS) {
check_struct_conversions(&rdata, structsize); check_struct_conversions(&rdata, structsize);
if (!dns_rdatatype_ismeta(rdata.type)) {
check_text_conversions(&rdata);
}
} }
} }