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Jacob Erlbeck jerlbeck at sysmocom.deThe legacy 7bit conversion functions (those without the '_n_' in the
name) gave wrong return values on 64 bit platforms due to unproper
signed/unsigned conversions and the usage of SIZE_MAX.
This patch fixes this by using a smaller max size (see
GSM_7BIT_LEGACY_MAX_BUFFER_SIZE, currently set to 64k) for the legacy
wrappers and by using unsigned int for max_septets.
In addition, there are tests now that check the return values of
legacy encoding and decoding.
Sponsored-by: On-Waves ehf
---
include/osmocom/gsm/gsm_utils.h | 3 +++
src/gsm/gsm_utils.c | 17 +++++++++++------
tests/sms/sms_test.c | 22 ++++++++++++++++++++++
tests/sms/sms_test.ok | 8 ++++++++
4 files changed, 44 insertions(+), 6 deletions(-)
diff --git a/include/osmocom/gsm/gsm_utils.h b/include/osmocom/gsm/gsm_utils.h
index f412e3e..02bfe4c 100644
--- a/include/osmocom/gsm/gsm_utils.h
+++ b/include/osmocom/gsm/gsm_utils.h
@@ -195,6 +195,9 @@ enum gsm_chan_t {
};
/* Deprectated functions */
+/* Limit encoding and decoding to use no more than this amount of buffer bytes */
+#define GSM_7BIT_LEGACY_MAX_BUFFER_SIZE 0x10000
+
int gsm_7bit_decode(char *decoded, const uint8_t *user_data, uint8_t length) OSMO_DEPRECATED("Use gsm_7bit_decode_n() instead");
int gsm_7bit_decode_ussd(char *decoded, const uint8_t *user_data, uint8_t length) OSMO_DEPRECATED("Use gsm_7bit_decode_n_ussd() instead");
int gsm_7bit_encode(uint8_t *result, const char *data) OSMO_DEPRECATED("Use gsm_7bit_encode_n() instead");
diff --git a/src/gsm/gsm_utils.c b/src/gsm/gsm_utils.c
index 5241c91..198ec69 100644
--- a/src/gsm/gsm_utils.c
+++ b/src/gsm/gsm_utils.c
@@ -273,7 +273,7 @@ int gsm_7bit_encode_n(uint8_t *result, size_t n, const char *data, int *octets)
{
int y = 0;
int o;
- int max_septets = n * 8 / 7;
+ size_t max_septets = n * 8 / 7;
/* prepare for the worst case, every character expanding to two bytes */
uint8_t *rdata = calloc(strlen(data) * 2, sizeof(uint8_t));
@@ -683,7 +683,8 @@ uint32_t gprs_tmsi2tlli(uint32_t p_tmsi, enum gprs_tlli_type type)
int gsm_7bit_decode(char *text, const uint8_t *user_data, uint8_t septet_l)
{
- gsm_7bit_decode_n(text, SIZE_MAX, user_data, septet_l);
+ gsm_7bit_decode_n(text, GSM_7BIT_LEGACY_MAX_BUFFER_SIZE,
+ user_data, septet_l);
/* Mimic the original behaviour. */
return septet_l;
@@ -691,21 +692,25 @@ int gsm_7bit_decode(char *text, const uint8_t *user_data, uint8_t septet_l)
int gsm_7bit_decode_ussd(char *text, const uint8_t *user_data, uint8_t length)
{
- return gsm_7bit_decode_n_ussd(text, SIZE_MAX, user_data, length);
+ return gsm_7bit_decode_n_ussd(text, GSM_7BIT_LEGACY_MAX_BUFFER_SIZE,
+ user_data, length);
}
int gsm_7bit_encode(uint8_t *result, const char *data)
{
int out;
- return gsm_7bit_encode_n(result, SIZE_MAX, data, &out);
+ return gsm_7bit_encode_n(result, GSM_7BIT_LEGACY_MAX_BUFFER_SIZE,
+ data, &out);
}
int gsm_7bit_encode_ussd(uint8_t *result, const char *data, int *octets)
{
- return gsm_7bit_encode_n_ussd(result, SIZE_MAX, data, octets);
+ return gsm_7bit_encode_n_ussd(result, GSM_7BIT_LEGACY_MAX_BUFFER_SIZE,
+ data, octets);
}
int gsm_7bit_encode_oct(uint8_t *result, const char *data, int *octets)
{
- return gsm_7bit_encode_n(result, SIZE_MAX, data, octets);
+ return gsm_7bit_encode_n(result, GSM_7BIT_LEGACY_MAX_BUFFER_SIZE,
+ data, octets);
}
diff --git a/tests/sms/sms_test.c b/tests/sms/sms_test.c
index 2c9d8d8..755b321 100644
--- a/tests/sms/sms_test.c
+++ b/tests/sms/sms_test.c
@@ -280,6 +280,17 @@ int main(int argc, char** argv)
/* test 7-bit encoding */
for (i = 0; i < ARRAY_SIZE(test_encode); ++i) {
+ /* Test legacy function (return value only) */
+ septet_length = gsm_7bit_encode(coded,
+ (const char *) test_encode[i].input);
+ printf("Legacy encode case %d: "
+ "septet length %d (expected %d)\n"
+ , i
+ , septet_length, test_encode[i].expected_septet_length
+ );
+ OSMO_ASSERT (septet_length == test_encode[i].expected_septet_length);
+
+ /* Test new function */
memset(coded, 0x42, sizeof(coded));
septet_length = gsm_7bit_encode_n(coded, sizeof(coded),
(const char *) test_encode[i].input,
@@ -296,6 +307,7 @@ int main(int argc, char** argv)
OSMO_ASSERT (octets_written == test_encode[i].expected_octet_length);
OSMO_ASSERT (octets_written == computed_octet_length);
OSMO_ASSERT (memcmp(coded, test_encode[i].expected, octets_written) == 0);
+ OSMO_ASSERT (septet_length == test_encode[i].expected_septet_length);
/* check buffer limiting */
memset(coded, 0xaa, sizeof(coded));
@@ -357,6 +369,16 @@ int main(int argc, char** argv)
/* test 7-bit decoding */
for (i = 0; i < ARRAY_SIZE(test_decode); ++i) {
+ /* Test legacy function (return value only) */
+ if (!test_decode[i].ud_hdr_ind) {
+ nchars = gsm_7bit_decode(result, test_decode[i].input,
+ test_decode[i].expected_septet_length);
+ printf("Legacy decode case %d: "
+ "return value %d (expected %d)\n",
+ i, nchars, test_decode[i].expected_septet_length);
+ }
+
+ /* Test new function */
memset(result, 0x42, sizeof(result));
nchars = gsm_7bit_decode_n_hdr(result, sizeof(result), test_decode[i].input,
test_decode[i].expected_septet_length, test_decode[i].ud_hdr_ind);
diff --git a/tests/sms/sms_test.ok b/tests/sms/sms_test.ok
index a71567d..fa536ea 100644
--- a/tests/sms/sms_test.ok
+++ b/tests/sms/sms_test.ok
@@ -1,11 +1,19 @@
SMS testing
+Legacy encode case 0: septet length 9 (expected 9)
Encode case 0: Octet length 8 (expected 8, computed 8), septet length 9 (expected 9)
+Legacy encode case 1: septet length 41 (expected 41)
Encode case 1: Octet length 36 (expected 36, computed 36), septet length 41 (expected 41)
+Legacy encode case 2: septet length 39 (expected 39)
Encode case 2: Octet length 35 (expected 35, computed 35), septet length 39 (expected 39)
+Legacy encode case 3: septet length 40 (expected 40)
Encode case 3: Octet length 35 (expected 35, computed 35), septet length 40 (expected 40)
+Legacy decode case 0: return value 9 (expected 9)
Decode case 0: return value 9 (expected 9)
+Legacy decode case 1: return value 41 (expected 41)
Decode case 1: return value 40 (expected 40)
+Legacy decode case 2: return value 39 (expected 39)
Decode case 2: return value 31 (expected 31)
+Legacy decode case 3: return value 40 (expected 40)
Decode case 3: return value 32 (expected 32)
Decode case 4: return value 153 (expected 153)
Decode case 5: return value 40 (expected 40)
--
1.7.9.5