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Vadim Yanitskiy gerrit-no-reply at lists.osmocom.orgVadim Yanitskiy has uploaded this change for review. ( https://gerrit.osmocom.org/14184
Change subject: gsm0408/gsm0408_test.c: introduce BCD number encoding / decoding test
......................................................................
gsm0408/gsm0408_test.c: introduce BCD number encoding / decoding test
So far, both gsm48_encode_bcd_number() and gsm48_decode_bcd_number2()
were uncovered by unit tests. Let's fill this gap by testing the
following scenarios:
- encoding / decoding of a regular 6-digit MSISDN;
- encoding / decoding of a long 15-digit MSISDN;
- encoding / decoding of a MSISDN to a buffer:
- with exactly matching size,
- with lower size (truncation);
- decoding LV buffer with incorrect length.
As it turns out, gsm48_decode_bcd_number2() does not properly
handle encoded LV if the output buffer size is equal to the
original MSISDN length + 1 (\0-terminator): one digit is lost.
For example, decoding of 15-digit long MSISDN to a buffer of size
16 (15 digits + 1 for \0) would give us only 14 digits. This is
reflected in the unit test output:
Decoding HEX (buffer limit=16) '0821436587092143f5'...
Expected: (rc=0) '123456789012345'
Actual: (rc=0) '12345678901234'
Moreover, if the output buffer is shorter than decoded number,
gsm48_decode_bcd_number2() silently truncates it and returns 0,
while its description states, that the rc should reflect this.
To be fixed in the follow-up patches.
Change-Id: I4b2c330cf8ffe4427c0bee7d5f3b74be56ecd85d
Related: OS#4025
---
M tests/gsm0408/gsm0408_test.c
M tests/gsm0408/gsm0408_test.ok
2 files changed, 179 insertions(+), 0 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/84/14184/1
diff --git a/tests/gsm0408/gsm0408_test.c b/tests/gsm0408/gsm0408_test.c
index 2d60b84..169010e 100644
--- a/tests/gsm0408/gsm0408_test.c
+++ b/tests/gsm0408/gsm0408_test.c
@@ -610,6 +610,150 @@
printf("\n");
}
+static const struct bcd_number_test {
+ /* Human-readable test name */
+ const char *test_name;
+
+ /* To be encoded number in ASCII */
+ const char *enc_ascii;
+ /* Expected encoding result in HEX */
+ const char *enc_hex;
+ /* Expected return code */
+ int enc_rc;
+
+ /* To be decoded buffer in HEX */
+ const char *dec_hex;
+ /* Expected decoding result in ASCII */
+ const char *dec_ascii;
+ /* Expected return code */
+ int dec_rc;
+
+ /* Encoding buffer limit (0 means unlimited) */
+ size_t enc_buf_lim;
+ /* Decoding buffer limit (0 means unlimited) */
+ size_t dec_buf_lim;
+} bcd_number_test_set[] = {
+ {
+ .test_name = "regular 6-digit MSISDN",
+
+ /* Encoding test */
+ .enc_ascii = "123456",
+ .enc_hex = "03214365",
+ .enc_rc = 4,
+
+ /* Decoding test */
+ .dec_hex = "03214365",
+ .dec_ascii = "123456",
+ },
+ {
+ .test_name = "long 15-digit (maximum) MSISDN",
+
+ /* Encoding test */
+ .enc_ascii = "123456789012345",
+ .enc_hex = "0821436587092143f5",
+ .enc_rc = 9,
+
+ /* Decoding test */
+ .dec_hex = "0821436587092143f5",
+ .dec_ascii = "123456789012345",
+ },
+ {
+ .test_name = "long 15-digit (maximum) MSISDN, limited buffer",
+
+ /* Encoding test */
+ .enc_ascii = "123456789012345",
+ .enc_hex = "0821436587092143f5",
+ .enc_rc = 9,
+
+ /* Decoding test */
+ .dec_hex = "0821436587092143f5",
+ .dec_ascii = "123456789012345",
+
+ /* Buffer length limitations */
+ .dec_buf_lim = 15 + 1,
+ .enc_buf_lim = 9,
+ },
+ {
+ .test_name = "to be truncated 20-digit MSISDN",
+
+ /* Encoding test (not enough room in buffer) */
+ .enc_ascii = "12345678901234567890",
+ .enc_hex = "", /* nothing */
+ .enc_rc = -EIO,
+
+ /* Decoding test (one 5 digits do not fit) */
+ .dec_hex = "0a21436587092143658709",
+ .dec_ascii = "123456789012345",
+ .dec_rc = 0,
+
+ /* Buffer length limitations */
+ .dec_buf_lim = 15 + 1, /* 5 digits less */
+ .enc_buf_lim = 9,
+ },
+ {
+ .test_name = "LV incorrect length",
+ .dec_hex = "05214365", /* should be 0x03 */
+ .dec_ascii = "(none)",
+ .dec_rc = -EIO,
+ },
+};
+
+static void test_bcd_number_encode_decode()
+{
+ const struct bcd_number_test *test;
+ uint8_t buf_enc[0xff] = { 0 };
+ char buf_dec[0xff] = { 0 };
+ size_t buf_len, i;
+ int rc;
+
+ printf("BSD number encoding / decoding test\n");
+
+ for (i = 0; i < ARRAY_SIZE(bcd_number_test_set); i++) {
+ test = &bcd_number_test_set[i];
+ printf("- Running test: %s\n", test->test_name);
+
+ if (test->enc_ascii) {
+ if (test->enc_buf_lim)
+ buf_len = test->enc_buf_lim;
+ else
+ buf_len = sizeof(buf_enc);
+
+ printf(" - Encoding ASCII (buffer limit=%zu) '%s'...\n",
+ test->enc_buf_lim, test->enc_ascii);
+
+ rc = gsm48_encode_bcd_number(buf_enc, buf_len,
+ 0, test->enc_ascii);
+ printf(" - Expected: (rc=%d) '%s'\n",
+ test->enc_rc, test->enc_hex);
+ printf(" - Actual: (rc=%d) '%s'\n",
+ rc, osmo_hexdump_nospc(buf_enc, rc >= 0 ? rc : 0));
+ }
+
+ if (test->dec_hex) {
+ /* Parse a HEX string */
+ rc = osmo_hexparse(test->dec_hex, buf_enc, sizeof(buf_enc));
+ OSMO_ASSERT(rc >= 0);
+
+ if (test->dec_buf_lim)
+ buf_len = test->dec_buf_lim;
+ else
+ buf_len = sizeof(buf_dec);
+
+ printf(" - Decoding HEX (buffer limit=%zu) '%s'...\n",
+ test->dec_buf_lim, test->dec_hex);
+
+ rc = gsm48_decode_bcd_number2(buf_dec, buf_len,
+ buf_enc, rc, 0);
+ printf(" - Expected: (rc=%d) '%s'\n",
+ test->dec_rc, test->dec_ascii);
+ printf(" - Actual: (rc=%d) '%s'\n",
+ rc, rc == 0 ? buf_dec : "(none)");
+ }
+ }
+
+ printf("\n");
+}
+
struct {
int range;
int arfcns_num;
@@ -949,6 +1093,7 @@
test_mid_from_imsi();
test_mid_encode_decode();
test_mid_decode_zero_length();
+ test_bcd_number_encode_decode();
test_ra_cap();
test_lai_encode_decode();
diff --git a/tests/gsm0408/gsm0408_test.ok b/tests/gsm0408/gsm0408_test.ok
index 0bd101d..2875a7e 100644
--- a/tests/gsm0408/gsm0408_test.ok
+++ b/tests/gsm0408/gsm0408_test.ok
@@ -139,6 +139,40 @@
rc=1
returned empty string
+BSD number encoding / decoding test
+- Running test: regular 6-digit MSISDN
+ - Encoding ASCII (buffer limit=0) '123456'...
+ - Expected: (rc=4) '03214365'
+ - Actual: (rc=4) '03214365'
+ - Decoding HEX (buffer limit=0) '03214365'...
+ - Expected: (rc=0) '123456'
+ - Actual: (rc=0) '123456'
+- Running test: long 15-digit (maximum) MSISDN
+ - Encoding ASCII (buffer limit=0) '123456789012345'...
+ - Expected: (rc=9) '0821436587092143f5'
+ - Actual: (rc=9) '0821436587092143f5'
+ - Decoding HEX (buffer limit=0) '0821436587092143f5'...
+ - Expected: (rc=0) '123456789012345'
+ - Actual: (rc=0) '123456789012345'
+- Running test: long 15-digit (maximum) MSISDN, limited buffer
+ - Encoding ASCII (buffer limit=9) '123456789012345'...
+ - Expected: (rc=9) '0821436587092143f5'
+ - Actual: (rc=9) '0821436587092143f5'
+ - Decoding HEX (buffer limit=16) '0821436587092143f5'...
+ - Expected: (rc=0) '123456789012345'
+ - Actual: (rc=0) '12345678901234'
+- Running test: to be truncated 20-digit MSISDN
+ - Encoding ASCII (buffer limit=9) '12345678901234567890'...
+ - Expected: (rc=-5) ''
+ - Actual: (rc=-5) ''
+ - Decoding HEX (buffer limit=16) '0a21436587092143658709'...
+ - Expected: (rc=0) '123456789012345'
+ - Actual: (rc=0) '12345678901234'
+- Running test: LV incorrect length
+ - Decoding HEX (buffer limit=0) '05214365'...
+ - Expected: (rc=-5) '(none)'
+ - Actual: (rc=-5) '(none)'
+
Constructed RA:
077-121-666-5
MCC+MNC in BCD: 70 17 21
--
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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I4b2c330cf8ffe4427c0bee7d5f3b74be56ecd85d
Gerrit-Change-Number: 14184
Gerrit-PatchSet: 1
Gerrit-Owner: Vadim Yanitskiy <axilirator at gmail.com>
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