diff options
Diffstat (limited to 'src/trunnel/hs/cell_establish_intro.c')
| -rw-r--r-- | src/trunnel/hs/cell_establish_intro.c | 735 |
1 files changed, 735 insertions, 0 deletions
diff --git a/src/trunnel/hs/cell_establish_intro.c b/src/trunnel/hs/cell_establish_intro.c new file mode 100644 index 0000000000..ae3b7b1bc8 --- /dev/null +++ b/src/trunnel/hs/cell_establish_intro.c @@ -0,0 +1,735 @@ +/* cell_establish_intro.c -- generated by Trunnel v1.5.2. + * https://gitweb.torproject.org/trunnel.git + * You probably shouldn't edit this file. + */ +#include <stdlib.h> +#include "trunnel-impl.h" + +#include "cell_establish_intro.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 cellestablishintro_deadcode_dummy__ = 0; +#define OR_DEADCODE_DUMMY || cellestablishintro_deadcode_dummy__ +#else +#define OR_DEADCODE_DUMMY +#endif + +#define CHECK_REMAINING(nbytes, label) \ + do { \ + if (remaining < (nbytes) OR_DEADCODE_DUMMY) { \ + goto label; \ + } \ + } while (0) + +typedef struct trn_cell_extension_st trn_cell_extension_t; +trn_cell_extension_t *trn_cell_extension_new(void); +void trn_cell_extension_free(trn_cell_extension_t *victim); +ssize_t trn_cell_extension_parse(trn_cell_extension_t **output, const uint8_t *input, const size_t len_in); +ssize_t trn_cell_extension_encoded_len(const trn_cell_extension_t *obj); +ssize_t trn_cell_extension_encode(uint8_t *output, size_t avail, const trn_cell_extension_t *input); +const char *trn_cell_extension_check(const trn_cell_extension_t *obj); +int trn_cell_extension_clear_errors(trn_cell_extension_t *obj); +trn_cell_establish_intro_t * +trn_cell_establish_intro_new(void) +{ + trn_cell_establish_intro_t *val = trunnel_calloc(1, sizeof(trn_cell_establish_intro_t)); + if (NULL == val) + return NULL; + return val; +} + +/** Release all storage held inside 'obj', but do not free 'obj'. + */ +static void +trn_cell_establish_intro_clear(trn_cell_establish_intro_t *obj) +{ + (void) obj; + TRUNNEL_DYNARRAY_WIPE(&obj->auth_key); + TRUNNEL_DYNARRAY_CLEAR(&obj->auth_key); + trn_cell_extension_free(obj->extensions); + obj->extensions = NULL; + TRUNNEL_DYNARRAY_WIPE(&obj->sig); + TRUNNEL_DYNARRAY_CLEAR(&obj->sig); +} + +void +trn_cell_establish_intro_free(trn_cell_establish_intro_t *obj) +{ + if (obj == NULL) + return; + trn_cell_establish_intro_clear(obj); + trunnel_memwipe(obj, sizeof(trn_cell_establish_intro_t)); + trunnel_free_(obj); +} + +const uint8_t * +trn_cell_establish_intro_get_start_cell(const trn_cell_establish_intro_t *inp) +{ + return inp->start_cell; +} +uint8_t +trn_cell_establish_intro_get_auth_key_type(const trn_cell_establish_intro_t *inp) +{ + return inp->auth_key_type; +} +int +trn_cell_establish_intro_set_auth_key_type(trn_cell_establish_intro_t *inp, uint8_t val) +{ + if (! ((val == 0 || val == 1 || val == 2))) { + TRUNNEL_SET_ERROR_CODE(inp); + return -1; + } + inp->auth_key_type = val; + return 0; +} +uint16_t +trn_cell_establish_intro_get_auth_key_len(const trn_cell_establish_intro_t *inp) +{ + return inp->auth_key_len; +} +int +trn_cell_establish_intro_set_auth_key_len(trn_cell_establish_intro_t *inp, uint16_t val) +{ + inp->auth_key_len = val; + return 0; +} +size_t +trn_cell_establish_intro_getlen_auth_key(const trn_cell_establish_intro_t *inp) +{ + return TRUNNEL_DYNARRAY_LEN(&inp->auth_key); +} + +uint8_t +trn_cell_establish_intro_get_auth_key(trn_cell_establish_intro_t *inp, size_t idx) +{ + return TRUNNEL_DYNARRAY_GET(&inp->auth_key, idx); +} + +uint8_t +trn_cell_establish_intro_getconst_auth_key(const trn_cell_establish_intro_t *inp, size_t idx) +{ + return trn_cell_establish_intro_get_auth_key((trn_cell_establish_intro_t*)inp, idx); +} +int +trn_cell_establish_intro_set_auth_key(trn_cell_establish_intro_t *inp, size_t idx, uint8_t elt) +{ + TRUNNEL_DYNARRAY_SET(&inp->auth_key, idx, elt); + return 0; +} +int +trn_cell_establish_intro_add_auth_key(trn_cell_establish_intro_t *inp, uint8_t elt) +{ +#if SIZE_MAX >= UINT16_MAX + if (inp->auth_key.n_ == UINT16_MAX) + goto trunnel_alloc_failed; +#endif + TRUNNEL_DYNARRAY_ADD(uint8_t, &inp->auth_key, elt, {}); + return 0; + trunnel_alloc_failed: + TRUNNEL_SET_ERROR_CODE(inp); + return -1; +} + +uint8_t * +trn_cell_establish_intro_getarray_auth_key(trn_cell_establish_intro_t *inp) +{ + return inp->auth_key.elts_; +} +const uint8_t * +trn_cell_establish_intro_getconstarray_auth_key(const trn_cell_establish_intro_t *inp) +{ + return (const uint8_t *)trn_cell_establish_intro_getarray_auth_key((trn_cell_establish_intro_t*)inp); +} +int +trn_cell_establish_intro_setlen_auth_key(trn_cell_establish_intro_t *inp, size_t newlen) +{ + uint8_t *newptr; +#if UINT16_MAX < SIZE_MAX + if (newlen > UINT16_MAX) + goto trunnel_alloc_failed; +#endif + newptr = trunnel_dynarray_setlen(&inp->auth_key.allocated_, + &inp->auth_key.n_, inp->auth_key.elts_, newlen, + sizeof(inp->auth_key.elts_[0]), (trunnel_free_fn_t) NULL, + &inp->trunnel_error_code_); + if (newlen != 0 && newptr == NULL) + goto trunnel_alloc_failed; + inp->auth_key.elts_ = newptr; + return 0; + trunnel_alloc_failed: + TRUNNEL_SET_ERROR_CODE(inp); + return -1; +} +struct trn_cell_extension_st * +trn_cell_establish_intro_get_extensions(trn_cell_establish_intro_t *inp) +{ + return inp->extensions; +} +const struct trn_cell_extension_st * +trn_cell_establish_intro_getconst_extensions(const trn_cell_establish_intro_t *inp) +{ + return trn_cell_establish_intro_get_extensions((trn_cell_establish_intro_t*) inp); +} +int +trn_cell_establish_intro_set_extensions(trn_cell_establish_intro_t *inp, struct trn_cell_extension_st *val) +{ + if (inp->extensions && inp->extensions != val) + trn_cell_extension_free(inp->extensions); + return trn_cell_establish_intro_set0_extensions(inp, val); +} +int +trn_cell_establish_intro_set0_extensions(trn_cell_establish_intro_t *inp, struct trn_cell_extension_st *val) +{ + inp->extensions = val; + return 0; +} +const uint8_t * +trn_cell_establish_intro_get_end_mac_fields(const trn_cell_establish_intro_t *inp) +{ + return inp->end_mac_fields; +} +size_t +trn_cell_establish_intro_getlen_handshake_mac(const trn_cell_establish_intro_t *inp) +{ + (void)inp; return TRUNNEL_SHA3_256_LEN; +} + +uint8_t +trn_cell_establish_intro_get_handshake_mac(trn_cell_establish_intro_t *inp, size_t idx) +{ + trunnel_assert(idx < TRUNNEL_SHA3_256_LEN); + return inp->handshake_mac[idx]; +} + +uint8_t +trn_cell_establish_intro_getconst_handshake_mac(const trn_cell_establish_intro_t *inp, size_t idx) +{ + return trn_cell_establish_intro_get_handshake_mac((trn_cell_establish_intro_t*)inp, idx); +} +int +trn_cell_establish_intro_set_handshake_mac(trn_cell_establish_intro_t *inp, size_t idx, uint8_t elt) +{ + trunnel_assert(idx < TRUNNEL_SHA3_256_LEN); + inp->handshake_mac[idx] = elt; + return 0; +} + +uint8_t * +trn_cell_establish_intro_getarray_handshake_mac(trn_cell_establish_intro_t *inp) +{ + return inp->handshake_mac; +} +const uint8_t * +trn_cell_establish_intro_getconstarray_handshake_mac(const trn_cell_establish_intro_t *inp) +{ + return (const uint8_t *)trn_cell_establish_intro_getarray_handshake_mac((trn_cell_establish_intro_t*)inp); +} +const uint8_t * +trn_cell_establish_intro_get_end_sig_fields(const trn_cell_establish_intro_t *inp) +{ + return inp->end_sig_fields; +} +uint16_t +trn_cell_establish_intro_get_sig_len(const trn_cell_establish_intro_t *inp) +{ + return inp->sig_len; +} +int +trn_cell_establish_intro_set_sig_len(trn_cell_establish_intro_t *inp, uint16_t val) +{ + inp->sig_len = val; + return 0; +} +size_t +trn_cell_establish_intro_getlen_sig(const trn_cell_establish_intro_t *inp) +{ + return TRUNNEL_DYNARRAY_LEN(&inp->sig); +} + +uint8_t +trn_cell_establish_intro_get_sig(trn_cell_establish_intro_t *inp, size_t idx) +{ + return TRUNNEL_DYNARRAY_GET(&inp->sig, idx); +} + +uint8_t +trn_cell_establish_intro_getconst_sig(const trn_cell_establish_intro_t *inp, size_t idx) +{ + return trn_cell_establish_intro_get_sig((trn_cell_establish_intro_t*)inp, idx); +} +int +trn_cell_establish_intro_set_sig(trn_cell_establish_intro_t *inp, size_t idx, uint8_t elt) +{ + TRUNNEL_DYNARRAY_SET(&inp->sig, idx, elt); + return 0; +} +int +trn_cell_establish_intro_add_sig(trn_cell_establish_intro_t *inp, uint8_t elt) +{ +#if SIZE_MAX >= UINT16_MAX + if (inp->sig.n_ == UINT16_MAX) + goto trunnel_alloc_failed; +#endif + TRUNNEL_DYNARRAY_ADD(uint8_t, &inp->sig, elt, {}); + return 0; + trunnel_alloc_failed: + TRUNNEL_SET_ERROR_CODE(inp); + return -1; +} + +uint8_t * +trn_cell_establish_intro_getarray_sig(trn_cell_establish_intro_t *inp) +{ + return inp->sig.elts_; +} +const uint8_t * +trn_cell_establish_intro_getconstarray_sig(const trn_cell_establish_intro_t *inp) +{ + return (const uint8_t *)trn_cell_establish_intro_getarray_sig((trn_cell_establish_intro_t*)inp); +} +int +trn_cell_establish_intro_setlen_sig(trn_cell_establish_intro_t *inp, size_t newlen) +{ + uint8_t *newptr; +#if UINT16_MAX < SIZE_MAX + if (newlen > UINT16_MAX) + goto trunnel_alloc_failed; +#endif + newptr = trunnel_dynarray_setlen(&inp->sig.allocated_, + &inp->sig.n_, inp->sig.elts_, newlen, + sizeof(inp->sig.elts_[0]), (trunnel_free_fn_t) NULL, + &inp->trunnel_error_code_); + if (newlen != 0 && newptr == NULL) + goto trunnel_alloc_failed; + inp->sig.elts_ = newptr; + return 0; + trunnel_alloc_failed: + TRUNNEL_SET_ERROR_CODE(inp); + return -1; +} +const char * +trn_cell_establish_intro_check(const trn_cell_establish_intro_t *obj) +{ + if (obj == NULL) + return "Object was NULL"; + if (obj->trunnel_error_code_) + return "A set function failed on this object"; + if (! (obj->auth_key_type == 0 || obj->auth_key_type == 1 || obj->auth_key_type == 2)) + return "Integer out of bounds"; + if (TRUNNEL_DYNARRAY_LEN(&obj->auth_key) != obj->auth_key_len) + return "Length mismatch for auth_key"; + { + const char *msg; + if (NULL != (msg = trn_cell_extension_check(obj->extensions))) + return msg; + } + if (TRUNNEL_DYNARRAY_LEN(&obj->sig) != obj->sig_len) + return "Length mismatch for sig"; + return NULL; +} + +ssize_t +trn_cell_establish_intro_encoded_len(const trn_cell_establish_intro_t *obj) +{ + ssize_t result = 0; + + if (NULL != trn_cell_establish_intro_check(obj)) + return -1; + + + /* Length of u8 auth_key_type IN [0, 1, 2] */ + result += 1; + + /* Length of u16 auth_key_len */ + result += 2; + + /* Length of u8 auth_key[auth_key_len] */ + result += TRUNNEL_DYNARRAY_LEN(&obj->auth_key); + + /* Length of struct trn_cell_extension extensions */ + result += trn_cell_extension_encoded_len(obj->extensions); + + /* Length of u8 handshake_mac[TRUNNEL_SHA3_256_LEN] */ + result += TRUNNEL_SHA3_256_LEN; + + /* Length of u16 sig_len */ + result += 2; + + /* Length of u8 sig[sig_len] */ + result += TRUNNEL_DYNARRAY_LEN(&obj->sig); + return result; +} +int +trn_cell_establish_intro_clear_errors(trn_cell_establish_intro_t *obj) +{ + int r = obj->trunnel_error_code_; + obj->trunnel_error_code_ = 0; + return r; +} +ssize_t +trn_cell_establish_intro_encode(uint8_t *output, const size_t avail, const trn_cell_establish_intro_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 = trn_cell_establish_intro_encoded_len(obj); +#endif + + if (NULL != (msg = trn_cell_establish_intro_check(obj))) + goto check_failed; + +#ifdef TRUNNEL_CHECK_ENCODED_LEN + trunnel_assert(encoded_len >= 0); +#endif + + /* Encode u8 auth_key_type IN [0, 1, 2] */ + trunnel_assert(written <= avail); + if (avail - written < 1) + goto truncated; + trunnel_set_uint8(ptr, (obj->auth_key_type)); + written += 1; ptr += 1; + + /* Encode u16 auth_key_len */ + trunnel_assert(written <= avail); + if (avail - written < 2) + goto truncated; + trunnel_set_uint16(ptr, trunnel_htons(obj->auth_key_len)); + written += 2; ptr += 2; + + /* Encode u8 auth_key[auth_key_len] */ + { + size_t elt_len = TRUNNEL_DYNARRAY_LEN(&obj->auth_key); + trunnel_assert(obj->auth_key_len == elt_len); + trunnel_assert(written <= avail); + if (avail - written < elt_len) + goto truncated; + if (elt_len) + memcpy(ptr, obj->auth_key.elts_, elt_len); + written += elt_len; ptr += elt_len; + } + + /* Encode struct trn_cell_extension extensions */ + trunnel_assert(written <= avail); + result = trn_cell_extension_encode(ptr, avail - written, obj->extensions); + if (result < 0) + goto fail; /* XXXXXXX !*/ + written += result; ptr += result; + + /* Encode u8 handshake_mac[TRUNNEL_SHA3_256_LEN] */ + trunnel_assert(written <= avail); + if (avail - written < TRUNNEL_SHA3_256_LEN) + goto truncated; + memcpy(ptr, obj->handshake_mac, TRUNNEL_SHA3_256_LEN); + written += TRUNNEL_SHA3_256_LEN; ptr += TRUNNEL_SHA3_256_LEN; + + /* Encode u16 sig_len */ + trunnel_assert(written <= avail); + if (avail - written < 2) + goto truncated; + trunnel_set_uint16(ptr, trunnel_htons(obj->sig_len)); + written += 2; ptr += 2; + + /* Encode u8 sig[sig_len] */ + { + size_t elt_len = TRUNNEL_DYNARRAY_LEN(&obj->sig); + trunnel_assert(obj->sig_len == elt_len); + trunnel_assert(written <= avail); + if (avail - written < elt_len) + goto truncated; + if (elt_len) + memcpy(ptr, obj->sig.elts_, elt_len); + written += elt_len; ptr += elt_len; + } + + + 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 trn_cell_establish_intro_parse(), but do not allocate the + * output object. + */ +static ssize_t +trn_cell_establish_intro_parse_into(trn_cell_establish_intro_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; + obj->start_cell = ptr; + + /* Parse u8 auth_key_type IN [0, 1, 2] */ + CHECK_REMAINING(1, truncated); + obj->auth_key_type = (trunnel_get_uint8(ptr)); + remaining -= 1; ptr += 1; + if (! (obj->auth_key_type == 0 || obj->auth_key_type == 1 || obj->auth_key_type == 2)) + goto fail; + + /* Parse u16 auth_key_len */ + CHECK_REMAINING(2, truncated); + obj->auth_key_len = trunnel_ntohs(trunnel_get_uint16(ptr)); + remaining -= 2; ptr += 2; + + /* Parse u8 auth_key[auth_key_len] */ + CHECK_REMAINING(obj->auth_key_len, truncated); + TRUNNEL_DYNARRAY_EXPAND(uint8_t, &obj->auth_key, obj->auth_key_len, {}); + obj->auth_key.n_ = obj->auth_key_len; + if (obj->auth_key_len) + memcpy(obj->auth_key.elts_, ptr, obj->auth_key_len); + ptr += obj->auth_key_len; remaining -= obj->auth_key_len; + + /* Parse struct trn_cell_extension extensions */ + result = trn_cell_extension_parse(&obj->extensions, ptr, remaining); + if (result < 0) + goto relay_fail; + trunnel_assert((size_t)result <= remaining); + remaining -= result; ptr += result; + obj->end_mac_fields = ptr; + + /* Parse u8 handshake_mac[TRUNNEL_SHA3_256_LEN] */ + CHECK_REMAINING(TRUNNEL_SHA3_256_LEN, truncated); + memcpy(obj->handshake_mac, ptr, TRUNNEL_SHA3_256_LEN); + remaining -= TRUNNEL_SHA3_256_LEN; ptr += TRUNNEL_SHA3_256_LEN; + obj->end_sig_fields = ptr; + + /* Parse u16 sig_len */ + CHECK_REMAINING(2, truncated); + obj->sig_len = trunnel_ntohs(trunnel_get_uint16(ptr)); + remaining -= 2; ptr += 2; + + /* Parse u8 sig[sig_len] */ + CHECK_REMAINING(obj->sig_len, truncated); + TRUNNEL_DYNARRAY_EXPAND(uint8_t, &obj->sig, obj->sig_len, {}); + obj->sig.n_ = obj->sig_len; + if (obj->sig_len) + memcpy(obj->sig.elts_, ptr, obj->sig_len); + ptr += obj->sig_len; remaining -= obj->sig_len; + trunnel_assert(ptr + remaining == input + len_in); + return len_in - remaining; + + truncated: + return -2; + relay_fail: + trunnel_assert(result < 0); + return result; + trunnel_alloc_failed: + return -1; + fail: + result = -1; + return result; +} + +ssize_t +trn_cell_establish_intro_parse(trn_cell_establish_intro_t **output, const uint8_t *input, const size_t len_in) +{ + ssize_t result; + *output = trn_cell_establish_intro_new(); + if (NULL == *output) + return -1; + result = trn_cell_establish_intro_parse_into(*output, input, len_in); + if (result < 0) { + trn_cell_establish_intro_free(*output); + *output = NULL; + } + return result; +} +trn_cell_intro_established_t * +trn_cell_intro_established_new(void) +{ + trn_cell_intro_established_t *val = trunnel_calloc(1, sizeof(trn_cell_intro_established_t)); + if (NULL == val) + return NULL; + return val; +} + +/** Release all storage held inside 'obj', but do not free 'obj'. + */ +static void +trn_cell_intro_established_clear(trn_cell_intro_established_t *obj) +{ + (void) obj; + trn_cell_extension_free(obj->extensions); + obj->extensions = NULL; +} + +void +trn_cell_intro_established_free(trn_cell_intro_established_t *obj) +{ + if (obj == NULL) + return; + trn_cell_intro_established_clear(obj); + trunnel_memwipe(obj, sizeof(trn_cell_intro_established_t)); + trunnel_free_(obj); +} + +struct trn_cell_extension_st * +trn_cell_intro_established_get_extensions(trn_cell_intro_established_t *inp) +{ + return inp->extensions; +} +const struct trn_cell_extension_st * +trn_cell_intro_established_getconst_extensions(const trn_cell_intro_established_t *inp) +{ + return trn_cell_intro_established_get_extensions((trn_cell_intro_established_t*) inp); +} +int +trn_cell_intro_established_set_extensions(trn_cell_intro_established_t *inp, struct trn_cell_extension_st *val) +{ + if (inp->extensions && inp->extensions != val) + trn_cell_extension_free(inp->extensions); + return trn_cell_intro_established_set0_extensions(inp, val); +} +int +trn_cell_intro_established_set0_extensions(trn_cell_intro_established_t *inp, struct trn_cell_extension_st *val) +{ + inp->extensions = val; + return 0; +} +const char * +trn_cell_intro_established_check(const trn_cell_intro_established_t *obj) +{ + if (obj == NULL) + return "Object was NULL"; + if (obj->trunnel_error_code_) + return "A set function failed on this object"; + { + const char *msg; + if (NULL != (msg = trn_cell_extension_check(obj->extensions))) + return msg; + } + return NULL; +} + +ssize_t +trn_cell_intro_established_encoded_len(const trn_cell_intro_established_t *obj) +{ + ssize_t result = 0; + + if (NULL != trn_cell_intro_established_check(obj)) + return -1; + + + /* Length of struct trn_cell_extension extensions */ + result += trn_cell_extension_encoded_len(obj->extensions); + return result; +} +int +trn_cell_intro_established_clear_errors(trn_cell_intro_established_t *obj) +{ + int r = obj->trunnel_error_code_; + obj->trunnel_error_code_ = 0; + return r; +} +ssize_t +trn_cell_intro_established_encode(uint8_t *output, const size_t avail, const trn_cell_intro_established_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 = trn_cell_intro_established_encoded_len(obj); +#endif + + if (NULL != (msg = trn_cell_intro_established_check(obj))) + goto check_failed; + +#ifdef TRUNNEL_CHECK_ENCODED_LEN + trunnel_assert(encoded_len >= 0); +#endif + + /* Encode struct trn_cell_extension extensions */ + trunnel_assert(written <= avail); + result = trn_cell_extension_encode(ptr, avail - written, obj->extensions); + if (result < 0) + goto fail; /* XXXXXXX !*/ + written += result; ptr += result; + + + 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; + + check_failed: + (void)msg; + result = -1; + goto fail; + fail: + trunnel_assert(result < 0); + return result; +} + +/** As trn_cell_intro_established_parse(), but do not allocate the + * output object. + */ +static ssize_t +trn_cell_intro_established_parse_into(trn_cell_intro_established_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 struct trn_cell_extension extensions */ + result = trn_cell_extension_parse(&obj->extensions, ptr, remaining); + if (result < 0) + goto relay_fail; + trunnel_assert((size_t)result <= remaining); + remaining -= result; ptr += result; + trunnel_assert(ptr + remaining == input + len_in); + return len_in - remaining; + + relay_fail: + trunnel_assert(result < 0); + return result; +} + +ssize_t +trn_cell_intro_established_parse(trn_cell_intro_established_t **output, const uint8_t *input, const size_t len_in) +{ + ssize_t result; + *output = trn_cell_intro_established_new(); + if (NULL == *output) + return -1; + result = trn_cell_intro_established_parse_into(*output, input, len_in); + if (result < 0) { + trn_cell_intro_established_free(*output); + *output = NULL; + } + return result; +} |