trunnel: Add prop224 RENDEZVOUS1 cell definition

Signed-off-by: David Goulet <dgoulet@torproject.org>

4 files changed, 430 insertions, 0 deletions

diff --git a/src/trunnel/hs/cell_rendezvous.c b/src/trunnel/hs/cell_rendezvous.c
new file mode 100644
index 0000000000..e961cd09d4
--- /dev/null
+++ b/src/trunnel/hs/cell_rendezvous.c
@@ -0,0 +1,292 @@
+/* cell_rendezvous.c -- generated by Trunnel v1.5.1.
+ * https://gitweb.torproject.org/trunnel.git
+ * You probably shouldn't edit this file.
+ */
+#include <stdlib.h>
+#include "trunnel-impl.h"
+
+#include "cell_rendezvous.h"
+
+#define TRUNNEL_SET_ERROR_CODE(obj) \
+  do {                              \
+    (obj)->trunnel_error_code_ = 1; \
+  } while (0)
+
+#if defined(__COVERITY__) || defined(__clang_analyzer__)
+/* If we're runnning a static analysis tool, we don't want it to complain
+ * that some of our remaining-bytes checks are dead-code. */
+int cellrendezvous_deadcode_dummy__ = 0;
+#define OR_DEADCODE_DUMMY || cellrendezvous_deadcode_dummy__
+#else
+#define OR_DEADCODE_DUMMY
+#endif
+
+#define CHECK_REMAINING(nbytes, label)                           \
+  do {                                                           \
+    if (remaining < (nbytes) OR_DEADCODE_DUMMY) {                \
+      goto label;                                                \
+    }                                                            \
+  } while (0)
+
+trn_cell_rendezvous1_t *
+trn_cell_rendezvous1_new(void)
+{
+  trn_cell_rendezvous1_t *val = trunnel_calloc(1, sizeof(trn_cell_rendezvous1_t));
+  if (NULL == val)
+    return NULL;
+  return val;
+}
+
+/** Release all storage held inside 'obj', but do not free 'obj'.
+ */
+static void
+trn_cell_rendezvous1_clear(trn_cell_rendezvous1_t *obj)
+{
+  (void) obj;
+  TRUNNEL_DYNARRAY_WIPE(&obj->handshake_info);
+  TRUNNEL_DYNARRAY_CLEAR(&obj->handshake_info);
+}
+
+void
+trn_cell_rendezvous1_free(trn_cell_rendezvous1_t *obj)
+{
+  if (obj == NULL)
+    return;
+  trn_cell_rendezvous1_clear(obj);
+  trunnel_memwipe(obj, sizeof(trn_cell_rendezvous1_t));
+  trunnel_free_(obj);
+}
+
+size_t
+trn_cell_rendezvous1_getlen_rendezvous_cookie(const trn_cell_rendezvous1_t *inp)
+{
+  (void)inp;  return TRUNNEL_REND_COOKIE_LEN;
+}
+
+uint8_t
+trn_cell_rendezvous1_get_rendezvous_cookie(trn_cell_rendezvous1_t *inp, size_t idx)
+{
+  trunnel_assert(idx < TRUNNEL_REND_COOKIE_LEN);
+  return inp->rendezvous_cookie[idx];
+}
+
+uint8_t
+trn_cell_rendezvous1_getconst_rendezvous_cookie(const trn_cell_rendezvous1_t *inp, size_t idx)
+{
+  return trn_cell_rendezvous1_get_rendezvous_cookie((trn_cell_rendezvous1_t*)inp, idx);
+}
+int
+trn_cell_rendezvous1_set_rendezvous_cookie(trn_cell_rendezvous1_t *inp, size_t idx, uint8_t elt)
+{
+  trunnel_assert(idx < TRUNNEL_REND_COOKIE_LEN);
+  inp->rendezvous_cookie[idx] = elt;
+  return 0;
+}
+
+uint8_t *
+trn_cell_rendezvous1_getarray_rendezvous_cookie(trn_cell_rendezvous1_t *inp)
+{
+  return inp->rendezvous_cookie;
+}
+const uint8_t  *
+trn_cell_rendezvous1_getconstarray_rendezvous_cookie(const trn_cell_rendezvous1_t *inp)
+{
+  return (const uint8_t  *)trn_cell_rendezvous1_getarray_rendezvous_cookie((trn_cell_rendezvous1_t*)inp);
+}
+size_t
+trn_cell_rendezvous1_getlen_handshake_info(const trn_cell_rendezvous1_t *inp)
+{
+  return TRUNNEL_DYNARRAY_LEN(&inp->handshake_info);
+}
+
+uint8_t
+trn_cell_rendezvous1_get_handshake_info(trn_cell_rendezvous1_t *inp, size_t idx)
+{
+  return TRUNNEL_DYNARRAY_GET(&inp->handshake_info, idx);
+}
+
+uint8_t
+trn_cell_rendezvous1_getconst_handshake_info(const trn_cell_rendezvous1_t *inp, size_t idx)
+{
+  return trn_cell_rendezvous1_get_handshake_info((trn_cell_rendezvous1_t*)inp, idx);
+}
+int
+trn_cell_rendezvous1_set_handshake_info(trn_cell_rendezvous1_t *inp, size_t idx, uint8_t elt)
+{
+  TRUNNEL_DYNARRAY_SET(&inp->handshake_info, idx, elt);
+  return 0;
+}
+int
+trn_cell_rendezvous1_add_handshake_info(trn_cell_rendezvous1_t *inp, uint8_t elt)
+{
+  TRUNNEL_DYNARRAY_ADD(uint8_t, &inp->handshake_info, elt, {});
+  return 0;
+ trunnel_alloc_failed:
+  TRUNNEL_SET_ERROR_CODE(inp);
+  return -1;
+}
+
+uint8_t *
+trn_cell_rendezvous1_getarray_handshake_info(trn_cell_rendezvous1_t *inp)
+{
+  return inp->handshake_info.elts_;
+}
+const uint8_t  *
+trn_cell_rendezvous1_getconstarray_handshake_info(const trn_cell_rendezvous1_t *inp)
+{
+  return (const uint8_t  *)trn_cell_rendezvous1_getarray_handshake_info((trn_cell_rendezvous1_t*)inp);
+}
+int
+trn_cell_rendezvous1_setlen_handshake_info(trn_cell_rendezvous1_t *inp, size_t newlen)
+{
+  uint8_t *newptr;
+  newptr = trunnel_dynarray_setlen(&inp->handshake_info.allocated_,
+                 &inp->handshake_info.n_, inp->handshake_info.elts_, newlen,
+                 sizeof(inp->handshake_info.elts_[0]), (trunnel_free_fn_t) NULL,
+                 &inp->trunnel_error_code_);
+  if (newlen != 0 && newptr == NULL)
+    goto trunnel_alloc_failed;
+  inp->handshake_info.elts_ = newptr;
+  return 0;
+ trunnel_alloc_failed:
+  TRUNNEL_SET_ERROR_CODE(inp);
+  return -1;
+}
+const char *
+trn_cell_rendezvous1_check(const trn_cell_rendezvous1_t *obj)
+{
+  if (obj == NULL)
+    return "Object was NULL";
+  if (obj->trunnel_error_code_)
+    return "A set function failed on this object";
+  return NULL;
+}
+
+ssize_t
+trn_cell_rendezvous1_encoded_len(const trn_cell_rendezvous1_t *obj)
+{
+  ssize_t result = 0;
+
+  if (NULL != trn_cell_rendezvous1_check(obj))
+     return -1;
+
+
+  /* Length of u8 rendezvous_cookie[TRUNNEL_REND_COOKIE_LEN] */
+  result += TRUNNEL_REND_COOKIE_LEN;
+
+  /* Length of u8 handshake_info[] */
+  result += TRUNNEL_DYNARRAY_LEN(&obj->handshake_info);
+  return result;
+}
+int
+trn_cell_rendezvous1_clear_errors(trn_cell_rendezvous1_t *obj)
+{
+  int r = obj->trunnel_error_code_;
+  obj->trunnel_error_code_ = 0;
+  return r;
+}
+ssize_t
+trn_cell_rendezvous1_encode(uint8_t *output, const size_t avail, const trn_cell_rendezvous1_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_rendezvous1_encoded_len(obj);
+#endif
+
+  if (NULL != (msg = trn_cell_rendezvous1_check(obj)))
+    goto check_failed;
+
+#ifdef TRUNNEL_CHECK_ENCODED_LEN
+  trunnel_assert(encoded_len >= 0);
+#endif
+
+  /* Encode u8 rendezvous_cookie[TRUNNEL_REND_COOKIE_LEN] */
+  trunnel_assert(written <= avail);
+  if (avail - written < TRUNNEL_REND_COOKIE_LEN)
+    goto truncated;
+  memcpy(ptr, obj->rendezvous_cookie, TRUNNEL_REND_COOKIE_LEN);
+  written += TRUNNEL_REND_COOKIE_LEN; ptr += TRUNNEL_REND_COOKIE_LEN;
+
+  /* Encode u8 handshake_info[] */
+  {
+    size_t elt_len = TRUNNEL_DYNARRAY_LEN(&obj->handshake_info);
+    trunnel_assert(written <= avail);
+    if (avail - written < elt_len)
+      goto truncated;
+    if (elt_len)
+      memcpy(ptr, obj->handshake_info.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_rendezvous1_parse(), but do not allocate the output
+ * object.
+ */
+static ssize_t
+trn_cell_rendezvous1_parse_into(trn_cell_rendezvous1_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 rendezvous_cookie[TRUNNEL_REND_COOKIE_LEN] */
+  CHECK_REMAINING(TRUNNEL_REND_COOKIE_LEN, truncated);
+  memcpy(obj->rendezvous_cookie, ptr, TRUNNEL_REND_COOKIE_LEN);
+  remaining -= TRUNNEL_REND_COOKIE_LEN; ptr += TRUNNEL_REND_COOKIE_LEN;
+
+  /* Parse u8 handshake_info[] */
+  TRUNNEL_DYNARRAY_EXPAND(uint8_t, &obj->handshake_info, remaining, {});
+  obj->handshake_info.n_ = remaining;
+  if (remaining)
+    memcpy(obj->handshake_info.elts_, ptr, remaining);
+  ptr += remaining; remaining -= remaining;
+  trunnel_assert(ptr + remaining == input + len_in);
+  return len_in - remaining;
+
+ truncated:
+  return -2;
+ trunnel_alloc_failed:
+  return -1;
+}
+
+ssize_t
+trn_cell_rendezvous1_parse(trn_cell_rendezvous1_t **output, const uint8_t *input, const size_t len_in)
+{
+  ssize_t result;
+  *output = trn_cell_rendezvous1_new();
+  if (NULL == *output)
+    return -1;
+  result = trn_cell_rendezvous1_parse_into(*output, input, len_in);
+  if (result < 0) {
+    trn_cell_rendezvous1_free(*output);
+    *output = NULL;
+  }
+  return result;
+}
diff --git a/src/trunnel/hs/cell_rendezvous.h b/src/trunnel/hs/cell_rendezvous.h
new file mode 100644
index 0000000000..2387d77f4f
--- /dev/null
+++ b/src/trunnel/hs/cell_rendezvous.h
@@ -0,0 +1,118 @@
+/* cell_rendezvous.h -- generated by by Trunnel v1.5.1.
+ * https://gitweb.torproject.org/trunnel.git
+ * You probably shouldn't edit this file.
+ */
+#ifndef TRUNNEL_CELL_RENDEZVOUS_H
+#define TRUNNEL_CELL_RENDEZVOUS_H
+
+#include <stdint.h>
+#include "trunnel.h"
+
+#define TRUNNEL_REND_COOKIE_LEN 20
+#if !defined(TRUNNEL_OPAQUE) && !defined(TRUNNEL_OPAQUE_TRN_CELL_RENDEZVOUS1)
+struct trn_cell_rendezvous1_st {
+  uint8_t rendezvous_cookie[TRUNNEL_REND_COOKIE_LEN];
+  TRUNNEL_DYNARRAY_HEAD(, uint8_t) handshake_info;
+  uint8_t trunnel_error_code_;
+};
+#endif
+typedef struct trn_cell_rendezvous1_st trn_cell_rendezvous1_t;
+/** Return a newly allocated trn_cell_rendezvous1 with all elements
+ * set to zero.
+ */
+trn_cell_rendezvous1_t *trn_cell_rendezvous1_new(void);
+/** Release all storage held by the trn_cell_rendezvous1 in 'victim'.
+ * (Do nothing if 'victim' is NULL.)
+ */
+void trn_cell_rendezvous1_free(trn_cell_rendezvous1_t *victim);
+/** Try to parse a trn_cell_rendezvous1 from the buffer in 'input',
+ * using up to 'len_in' bytes from the input buffer. On success,
+ * return the number of bytes consumed and set *output to the newly
+ * allocated trn_cell_rendezvous1_t. On failure, return -2 if the
+ * input appears truncated, and -1 if the input is otherwise invalid.
+ */
+ssize_t trn_cell_rendezvous1_parse(trn_cell_rendezvous1_t **output, const uint8_t *input, const size_t len_in);
+/** Return the number of bytes we expect to need to encode the
+ * trn_cell_rendezvous1 in 'obj'. On failure, return a negative value.
+ * Note that this value may be an overestimate, and can even be an
+ * underestimate for certain unencodeable objects.
+ */
+ssize_t trn_cell_rendezvous1_encoded_len(const trn_cell_rendezvous1_t *obj);
+/** Try to encode the trn_cell_rendezvous1 from 'input' into the
+ * buffer at 'output', using up to 'avail' bytes of the output buffer.
+ * On success, return the number of bytes used. On failure, return -2
+ * if the buffer was not long enough, and -1 if the input was invalid.
+ */
+ssize_t trn_cell_rendezvous1_encode(uint8_t *output, size_t avail, const trn_cell_rendezvous1_t *input);
+/** Check whether the internal state of the trn_cell_rendezvous1 in
+ * 'obj' is consistent. Return NULL if it is, and a short message if
+ * it is not.
+ */
+const char *trn_cell_rendezvous1_check(const trn_cell_rendezvous1_t *obj);
+/** Clear any errors that were set on the object 'obj' by its setter
+ * functions. Return true iff errors were cleared.
+ */
+int trn_cell_rendezvous1_clear_errors(trn_cell_rendezvous1_t *obj);
+/** Return the (constant) length of the array holding the
+ * rendezvous_cookie field of the trn_cell_rendezvous1_t in 'inp'.
+ */
+size_t trn_cell_rendezvous1_getlen_rendezvous_cookie(const trn_cell_rendezvous1_t *inp);
+/** Return the element at position 'idx' of the fixed array field
+ * rendezvous_cookie of the trn_cell_rendezvous1_t in 'inp'.
+ */
+uint8_t trn_cell_rendezvous1_get_rendezvous_cookie(trn_cell_rendezvous1_t *inp, size_t idx);
+/** As trn_cell_rendezvous1_get_rendezvous_cookie, but take and return
+ * a const pointer
+ */
+uint8_t trn_cell_rendezvous1_getconst_rendezvous_cookie(const trn_cell_rendezvous1_t *inp, size_t idx);
+/** Change the element at position 'idx' of the fixed array field
+ * rendezvous_cookie of the trn_cell_rendezvous1_t in 'inp', so that
+ * it will hold the value 'elt'.
+ */
+int trn_cell_rendezvous1_set_rendezvous_cookie(trn_cell_rendezvous1_t *inp, size_t idx, uint8_t elt);
+/** Return a pointer to the TRUNNEL_REND_COOKIE_LEN-element array
+ * field rendezvous_cookie of 'inp'.
+ */
+uint8_t * trn_cell_rendezvous1_getarray_rendezvous_cookie(trn_cell_rendezvous1_t *inp);
+/** As trn_cell_rendezvous1_get_rendezvous_cookie, but take and return
+ * a const pointer
+ */
+const uint8_t  * trn_cell_rendezvous1_getconstarray_rendezvous_cookie(const trn_cell_rendezvous1_t *inp);
+/** Return the length of the dynamic array holding the handshake_info
+ * field of the trn_cell_rendezvous1_t in 'inp'.
+ */
+size_t trn_cell_rendezvous1_getlen_handshake_info(const trn_cell_rendezvous1_t *inp);
+/** Return the element at position 'idx' of the dynamic array field
+ * handshake_info of the trn_cell_rendezvous1_t in 'inp'.
+ */
+uint8_t trn_cell_rendezvous1_get_handshake_info(trn_cell_rendezvous1_t *inp, size_t idx);
+/** As trn_cell_rendezvous1_get_handshake_info, but take and return a
+ * const pointer
+ */
+uint8_t trn_cell_rendezvous1_getconst_handshake_info(const trn_cell_rendezvous1_t *inp, size_t idx);
+/** Change the element at position 'idx' of the dynamic array field
+ * handshake_info of the trn_cell_rendezvous1_t in 'inp', so that it
+ * will hold the value 'elt'.
+ */
+int trn_cell_rendezvous1_set_handshake_info(trn_cell_rendezvous1_t *inp, size_t idx, uint8_t elt);
+/** Append a new element 'elt' to the dynamic array field
+ * handshake_info of the trn_cell_rendezvous1_t in 'inp'.
+ */
+int trn_cell_rendezvous1_add_handshake_info(trn_cell_rendezvous1_t *inp, uint8_t elt);
+/** Return a pointer to the variable-length array field handshake_info
+ * of 'inp'.
+ */
+uint8_t * trn_cell_rendezvous1_getarray_handshake_info(trn_cell_rendezvous1_t *inp);
+/** As trn_cell_rendezvous1_get_handshake_info, but take and return a
+ * const pointer
+ */
+const uint8_t  * trn_cell_rendezvous1_getconstarray_handshake_info(const trn_cell_rendezvous1_t *inp);
+/** Change the length of the variable-length array field
+ * handshake_info of 'inp' to 'newlen'.Fill extra elements with 0.
+ * Return 0 on success; return -1 and set the error code on 'inp' on
+ * failure.
+ */
+int trn_cell_rendezvous1_setlen_handshake_info(trn_cell_rendezvous1_t *inp, size_t newlen);
+
+
+#endif
diff --git a/src/trunnel/hs/cell_rendezvous.trunnel b/src/trunnel/hs/cell_rendezvous.trunnel
new file mode 100644
index 0000000000..27f1728b4a
--- /dev/null
+++ b/src/trunnel/hs/cell_rendezvous.trunnel
@@ -0,0 +1,18 @@
+/*
+ * This contains the definition of the RENDEZVOUS1 cell for onion service
+ * version 3 and onward. The following format is specified in proposal 224
+ * section 4.2.
+ */
+
+/* Rendezvous cookie length. */
+const TRUNNEL_REND_COOKIE_LEN = 20;
+
+/* RENDEZVOUS1 payload. See details in section 4.2. */
+struct trn_cell_rendezvous1 {
+  /* The RENDEZVOUS_COOKIE field. */
+  u8 rendezvous_cookie[TRUNNEL_REND_COOKIE_LEN];
+  
+  /* The HANDSHAKE_INFO field which has a variable length depending on the
+   * handshake type used. */
+  u8 handshake_info[];
+};
diff --git a/src/trunnel/include.am b/src/trunnel/include.am
index de6cf4781f..ca79ff3a39 100644
--- a/src/trunnel/include.am
+++ b/src/trunnel/include.am
@@ -22,6 +22,7 @@ TRUNNELSOURCES = \
 	src/trunnel/hs/cell_common.c            \
 	src/trunnel/hs/cell_establish_intro.c	\
 	src/trunnel/hs/cell_introduce1.c \
+	src/trunnel/hs/cell_rendezvous.c \
 	src/trunnel/channelpadding_negotiation.c
 
 TRUNNELHEADERS = \
@@ -34,6 +35,7 @@ TRUNNELHEADERS = \
 	src/trunnel/hs/cell_common.h            \
 	src/trunnel/hs/cell_establish_intro.h	\
 	src/trunnel/hs/cell_introduce1.h \
+	src/trunnel/hs/cell_rendezvous.h \
 	src/trunnel/channelpadding_negotiation.h
 
 src_trunnel_libor_trunnel_a_SOURCES = $(TRUNNELSOURCES)