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- /* sendme_cell.c -- generated by Trunnel v1.5.3.
- * https://gitweb.torproject.org/trunnel.git
- * You probably shouldn't edit this file.
- */
- #include <stdlib.h>
- #include "trunnel-impl.h"
- #include "sendme_cell.h"
- #define TRUNNEL_SET_ERROR_CODE(obj) \
- do { \
- (obj)->trunnel_error_code_ = 1; \
- } while (0)
- #if defined(__COVERITY__) || defined(__clang_analyzer__)
- /* If we're running a static analysis tool, we don't want it to complain
- * that some of our remaining-bytes checks are dead-code. */
- int sendmecell_deadcode_dummy__ = 0;
- #define OR_DEADCODE_DUMMY || sendmecell_deadcode_dummy__
- #else
- #define OR_DEADCODE_DUMMY
- #endif
- #define CHECK_REMAINING(nbytes, label) \
- do { \
- if (remaining < (nbytes) OR_DEADCODE_DUMMY) { \
- goto label; \
- } \
- } while (0)
- sendme_cell_t *
- sendme_cell_new(void)
- {
- sendme_cell_t *val = trunnel_calloc(1, sizeof(sendme_cell_t));
- if (NULL == val)
- return NULL;
- return val;
- }
- /** Release all storage held inside 'obj', but do not free 'obj'.
- */
- static void
- sendme_cell_clear(sendme_cell_t *obj)
- {
- (void) obj;
- }
- void
- sendme_cell_free(sendme_cell_t *obj)
- {
- if (obj == NULL)
- return;
- sendme_cell_clear(obj);
- trunnel_memwipe(obj, sizeof(sendme_cell_t));
- trunnel_free_(obj);
- }
- uint8_t
- sendme_cell_get_version(const sendme_cell_t *inp)
- {
- return inp->version;
- }
- int
- sendme_cell_set_version(sendme_cell_t *inp, uint8_t val)
- {
- if (! ((val == 0 || val == 1))) {
- TRUNNEL_SET_ERROR_CODE(inp);
- return -1;
- }
- inp->version = val;
- return 0;
- }
- uint16_t
- sendme_cell_get_data_len(const sendme_cell_t *inp)
- {
- return inp->data_len;
- }
- int
- sendme_cell_set_data_len(sendme_cell_t *inp, uint16_t val)
- {
- inp->data_len = val;
- return 0;
- }
- size_t
- sendme_cell_getlen_data_v1_digest(const sendme_cell_t *inp)
- {
- (void)inp; return TRUNNEL_SENDME_V1_DIGEST_LEN;
- }
- uint8_t
- sendme_cell_get_data_v1_digest(sendme_cell_t *inp, size_t idx)
- {
- trunnel_assert(idx < TRUNNEL_SENDME_V1_DIGEST_LEN);
- return inp->data_v1_digest[idx];
- }
- uint8_t
- sendme_cell_getconst_data_v1_digest(const sendme_cell_t *inp, size_t idx)
- {
- return sendme_cell_get_data_v1_digest((sendme_cell_t*)inp, idx);
- }
- int
- sendme_cell_set_data_v1_digest(sendme_cell_t *inp, size_t idx, uint8_t elt)
- {
- trunnel_assert(idx < TRUNNEL_SENDME_V1_DIGEST_LEN);
- inp->data_v1_digest[idx] = elt;
- return 0;
- }
- uint8_t *
- sendme_cell_getarray_data_v1_digest(sendme_cell_t *inp)
- {
- return inp->data_v1_digest;
- }
- const uint8_t *
- sendme_cell_getconstarray_data_v1_digest(const sendme_cell_t *inp)
- {
- return (const uint8_t *)sendme_cell_getarray_data_v1_digest((sendme_cell_t*)inp);
- }
- const char *
- sendme_cell_check(const sendme_cell_t *obj)
- {
- if (obj == NULL)
- return "Object was NULL";
- if (obj->trunnel_error_code_)
- return "A set function failed on this object";
- if (! (obj->version == 0 || obj->version == 1))
- return "Integer out of bounds";
- switch (obj->version) {
- case 0:
- break;
- case 1:
- break;
- default:
- return "Bad tag for union";
- break;
- }
- return NULL;
- }
- ssize_t
- sendme_cell_encoded_len(const sendme_cell_t *obj)
- {
- ssize_t result = 0;
- if (NULL != sendme_cell_check(obj))
- return -1;
- /* Length of u8 version IN [0, 1] */
- result += 1;
- /* Length of u16 data_len */
- result += 2;
- switch (obj->version) {
- case 0:
- break;
- case 1:
- /* Length of u8 data_v1_digest[TRUNNEL_SENDME_V1_DIGEST_LEN] */
- result += TRUNNEL_SENDME_V1_DIGEST_LEN;
- break;
- default:
- trunnel_assert(0);
- break;
- }
- return result;
- }
- int
- sendme_cell_clear_errors(sendme_cell_t *obj)
- {
- int r = obj->trunnel_error_code_;
- obj->trunnel_error_code_ = 0;
- return r;
- }
- ssize_t
- sendme_cell_encode(uint8_t *output, const size_t avail, const sendme_cell_t *obj)
- {
- ssize_t result = 0;
- size_t written = 0;
- uint8_t *ptr = output;
- const char *msg;
- #ifdef TRUNNEL_CHECK_ENCODED_LEN
- const ssize_t encoded_len = sendme_cell_encoded_len(obj);
- #endif
- uint8_t *backptr_data_len = NULL;
- if (NULL != (msg = sendme_cell_check(obj)))
- goto check_failed;
- #ifdef TRUNNEL_CHECK_ENCODED_LEN
- trunnel_assert(encoded_len >= 0);
- #endif
- /* Encode u8 version IN [0, 1] */
- trunnel_assert(written <= avail);
- if (avail - written < 1)
- goto truncated;
- trunnel_set_uint8(ptr, (obj->version));
- written += 1; ptr += 1;
- /* Encode u16 data_len */
- backptr_data_len = ptr;
- trunnel_assert(written <= avail);
- if (avail - written < 2)
- goto truncated;
- trunnel_set_uint16(ptr, trunnel_htons(obj->data_len));
- written += 2; ptr += 2;
- {
- size_t written_before_union = written;
- /* Encode union data[version] */
- trunnel_assert(written <= avail);
- switch (obj->version) {
- case 0:
- break;
- case 1:
- /* Encode u8 data_v1_digest[TRUNNEL_SENDME_V1_DIGEST_LEN] */
- trunnel_assert(written <= avail);
- if (avail - written < TRUNNEL_SENDME_V1_DIGEST_LEN)
- goto truncated;
- memcpy(ptr, obj->data_v1_digest, TRUNNEL_SENDME_V1_DIGEST_LEN);
- written += TRUNNEL_SENDME_V1_DIGEST_LEN; ptr += TRUNNEL_SENDME_V1_DIGEST_LEN;
- break;
- default:
- trunnel_assert(0);
- break;
- }
- /* Write the length field back to data_len */
- trunnel_assert(written >= written_before_union);
- #if UINT16_MAX < SIZE_MAX
- if (written - written_before_union > UINT16_MAX)
- goto check_failed;
- #endif
- trunnel_set_uint16(backptr_data_len, trunnel_htons(written - written_before_union));
- }
- trunnel_assert(ptr == output + written);
- #ifdef TRUNNEL_CHECK_ENCODED_LEN
- {
- trunnel_assert(encoded_len >= 0);
- trunnel_assert((size_t)encoded_len == written);
- }
- #endif
- return written;
- truncated:
- result = -2;
- goto fail;
- check_failed:
- (void)msg;
- result = -1;
- goto fail;
- fail:
- trunnel_assert(result < 0);
- return result;
- }
- /** As sendme_cell_parse(), but do not allocate the output object.
- */
- static ssize_t
- sendme_cell_parse_into(sendme_cell_t *obj, const uint8_t *input, const size_t len_in)
- {
- const uint8_t *ptr = input;
- size_t remaining = len_in;
- ssize_t result = 0;
- (void)result;
- /* Parse u8 version IN [0, 1] */
- CHECK_REMAINING(1, truncated);
- obj->version = (trunnel_get_uint8(ptr));
- remaining -= 1; ptr += 1;
- if (! (obj->version == 0 || obj->version == 1))
- goto fail;
- /* Parse u16 data_len */
- CHECK_REMAINING(2, truncated);
- obj->data_len = trunnel_ntohs(trunnel_get_uint16(ptr));
- remaining -= 2; ptr += 2;
- {
- size_t remaining_after;
- CHECK_REMAINING(obj->data_len, truncated);
- remaining_after = remaining - obj->data_len;
- remaining = obj->data_len;
- /* Parse union data[version] */
- switch (obj->version) {
- case 0:
- /* Skip to end of union */
- ptr += remaining; remaining = 0;
- break;
- case 1:
- /* Parse u8 data_v1_digest[TRUNNEL_SENDME_V1_DIGEST_LEN] */
- CHECK_REMAINING(TRUNNEL_SENDME_V1_DIGEST_LEN, fail);
- memcpy(obj->data_v1_digest, ptr, TRUNNEL_SENDME_V1_DIGEST_LEN);
- remaining -= TRUNNEL_SENDME_V1_DIGEST_LEN; ptr += TRUNNEL_SENDME_V1_DIGEST_LEN;
- break;
- default:
- goto fail;
- break;
- }
- if (remaining != 0)
- goto fail;
- remaining = remaining_after;
- }
- trunnel_assert(ptr + remaining == input + len_in);
- return len_in - remaining;
- truncated:
- return -2;
- fail:
- result = -1;
- return result;
- }
- ssize_t
- sendme_cell_parse(sendme_cell_t **output, const uint8_t *input, const size_t len_in)
- {
- ssize_t result;
- *output = sendme_cell_new();
- if (NULL == *output)
- return -1;
- result = sendme_cell_parse_into(*output, input, len_in);
- if (result < 0) {
- sendme_cell_free(*output);
- *output = NULL;
- }
- return result;
- }
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