tor

channelpadding_negotiation.c (7295B)

---

/* channelpadding_negotiation.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 "channelpadding_negotiation.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 channelpaddingnegotiation_deadcode_dummy__ = 0;
#define OR_DEADCODE_DUMMY || channelpaddingnegotiation_deadcode_dummy__
#else
#define OR_DEADCODE_DUMMY
#endif

#define CHECK_REMAINING(nbytes, label)                           \
 do {                                                           \
   if (remaining < (nbytes) OR_DEADCODE_DUMMY) {                \
     goto label;                                                \
   }                                                            \
 } while (0)

channelpadding_negotiate_t *
channelpadding_negotiate_new(void)
{
 channelpadding_negotiate_t *val = trunnel_calloc(1, sizeof(channelpadding_negotiate_t));
 if (NULL == val)
   return NULL;
 val->command = CHANNELPADDING_COMMAND_START;
 return val;
}

/** Release all storage held inside 'obj', but do not free 'obj'.
*/
static void
channelpadding_negotiate_clear(channelpadding_negotiate_t *obj)
{
 (void) obj;
}

void
channelpadding_negotiate_free(channelpadding_negotiate_t *obj)
{
 if (obj == NULL)
   return;
 channelpadding_negotiate_clear(obj);
 trunnel_memwipe(obj, sizeof(channelpadding_negotiate_t));
 trunnel_free_(obj);
}

uint8_t
channelpadding_negotiate_get_version(const channelpadding_negotiate_t *inp)
{
 return inp->version;
}
int
channelpadding_negotiate_set_version(channelpadding_negotiate_t *inp, uint8_t val)
{
 if (! ((val == 0))) {
    TRUNNEL_SET_ERROR_CODE(inp);
    return -1;
 }
 inp->version = val;
 return 0;
}
uint8_t
channelpadding_negotiate_get_command(const channelpadding_negotiate_t *inp)
{
 return inp->command;
}
int
channelpadding_negotiate_set_command(channelpadding_negotiate_t *inp, uint8_t val)
{
 if (! ((val == CHANNELPADDING_COMMAND_START || val == CHANNELPADDING_COMMAND_STOP))) {
    TRUNNEL_SET_ERROR_CODE(inp);
    return -1;
 }
 inp->command = val;
 return 0;
}
uint16_t
channelpadding_negotiate_get_ito_low_ms(const channelpadding_negotiate_t *inp)
{
 return inp->ito_low_ms;
}
int
channelpadding_negotiate_set_ito_low_ms(channelpadding_negotiate_t *inp, uint16_t val)
{
 inp->ito_low_ms = val;
 return 0;
}
uint16_t
channelpadding_negotiate_get_ito_high_ms(const channelpadding_negotiate_t *inp)
{
 return inp->ito_high_ms;
}
int
channelpadding_negotiate_set_ito_high_ms(channelpadding_negotiate_t *inp, uint16_t val)
{
 inp->ito_high_ms = val;
 return 0;
}
const char *
channelpadding_negotiate_check(const channelpadding_negotiate_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))
   return "Integer out of bounds";
 if (! (obj->command == CHANNELPADDING_COMMAND_START || obj->command == CHANNELPADDING_COMMAND_STOP))
   return "Integer out of bounds";
 return NULL;
}

ssize_t
channelpadding_negotiate_encoded_len(const channelpadding_negotiate_t *obj)
{
 ssize_t result = 0;

 if (NULL != channelpadding_negotiate_check(obj))
    return -1;


 /* Length of u8 version IN [0] */
 result += 1;

 /* Length of u8 command IN [CHANNELPADDING_COMMAND_START, CHANNELPADDING_COMMAND_STOP] */
 result += 1;

 /* Length of u16 ito_low_ms */
 result += 2;

 /* Length of u16 ito_high_ms */
 result += 2;
 return result;
}
int
channelpadding_negotiate_clear_errors(channelpadding_negotiate_t *obj)
{
 int r = obj->trunnel_error_code_;
 obj->trunnel_error_code_ = 0;
 return r;
}
ssize_t
channelpadding_negotiate_encode(uint8_t *output, const size_t avail, const channelpadding_negotiate_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 = channelpadding_negotiate_encoded_len(obj);
#endif

 if (NULL != (msg = channelpadding_negotiate_check(obj)))
   goto check_failed;

#ifdef TRUNNEL_CHECK_ENCODED_LEN
 trunnel_assert(encoded_len >= 0);
#endif

 /* Encode u8 version IN [0] */
 trunnel_assert(written <= avail);
 if (avail - written < 1)
   goto truncated;
 trunnel_set_uint8(ptr, (obj->version));
 written += 1; ptr += 1;

 /* Encode u8 command IN [CHANNELPADDING_COMMAND_START, CHANNELPADDING_COMMAND_STOP] */
 trunnel_assert(written <= avail);
 if (avail - written < 1)
   goto truncated;
 trunnel_set_uint8(ptr, (obj->command));
 written += 1; ptr += 1;

 /* Encode u16 ito_low_ms */
 trunnel_assert(written <= avail);
 if (avail - written < 2)
   goto truncated;
 trunnel_set_uint16(ptr, trunnel_htons(obj->ito_low_ms));
 written += 2; ptr += 2;

 /* Encode u16 ito_high_ms */
 trunnel_assert(written <= avail);
 if (avail - written < 2)
   goto truncated;
 trunnel_set_uint16(ptr, trunnel_htons(obj->ito_high_ms));
 written += 2; ptr += 2;


 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 channelpadding_negotiate_parse(), but do not allocate the
* output object.
*/
static ssize_t
channelpadding_negotiate_parse_into(channelpadding_negotiate_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] */
 CHECK_REMAINING(1, truncated);
 obj->version = (trunnel_get_uint8(ptr));
 remaining -= 1; ptr += 1;
 if (! (obj->version == 0))
   goto fail;

 /* Parse u8 command IN [CHANNELPADDING_COMMAND_START, CHANNELPADDING_COMMAND_STOP] */
 CHECK_REMAINING(1, truncated);
 obj->command = (trunnel_get_uint8(ptr));
 remaining -= 1; ptr += 1;
 if (! (obj->command == CHANNELPADDING_COMMAND_START || obj->command == CHANNELPADDING_COMMAND_STOP))
   goto fail;

 /* Parse u16 ito_low_ms */
 CHECK_REMAINING(2, truncated);
 obj->ito_low_ms = trunnel_ntohs(trunnel_get_uint16(ptr));
 remaining -= 2; ptr += 2;

 /* Parse u16 ito_high_ms */
 CHECK_REMAINING(2, truncated);
 obj->ito_high_ms = trunnel_ntohs(trunnel_get_uint16(ptr));
 remaining -= 2; ptr += 2;
 trunnel_assert(ptr + remaining == input + len_in);
 return len_in - remaining;

truncated:
 return -2;
fail:
 result = -1;
 return result;
}

ssize_t
channelpadding_negotiate_parse(channelpadding_negotiate_t **output, const uint8_t *input, const size_t len_in)
{
 ssize_t result;
 *output = channelpadding_negotiate_new();
 if (NULL == *output)
   return -1;
 result = channelpadding_negotiate_parse_into(*output, input, len_in);
 if (result < 0) {
   channelpadding_negotiate_free(*output);
   *output = NULL;
 }
 return result;
}