/src/curl_fuzzer/openssl_contract_shim.cc

Source
/*
 * Copyright (C) Max Dymond, <cmeister2@gmail.com>, et al.
 *
 * SPDX-License-Identifier: curl
 */

#include <openssl/ssl.h>

#include <array>
#include <atomic>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <mutex>
#include <type_traits>

namespace {

// SSL_get_error classifies a preceding I/O result for one SSL object. Keep
// pending results keyed by that object so interleaved connections cannot
// replace one another's classification state.
struct PendingIoCall {
  const SSL *ssl = nullptr;
  const char *api = nullptr;
  long long result = 0;
};

struct FatalConnection {
  const SSL *ssl = nullptr;
  const char *io_api = nullptr;
  long long io_result = 0;
  int ssl_error = SSL_ERROR_NONE;
};

// Fixed tables keep allocation-failure fuzzing from disabling or perturbing
// the monitor.
constexpr std::size_t kMaximumTrackedConnections = 256;
std::array<PendingIoCall, kMaximumTrackedConnections> pending_io_calls{};
std::mutex pending_io_calls_mutex;
std::atomic<std::size_t> pending_io_call_count{0};

constexpr std::size_t kMaximumFatalConnections = kMaximumTrackedConnections;
std::array<FatalConnection, kMaximumFatalConnections> fatal_connections{};
std::mutex fatal_connections_mutex;
std::atomic<std::size_t> fatal_connection_count{0};

// Static libssl contains calls to public SSL APIs. --wrap redirects those
// calls too, so calls made while a real OpenSSL function is running bypass the
// monitor and cannot replace the application call being classified.
thread_local unsigned real_call_depth = 0;

class RealCallScope {
public:
  RealCallScope() { ++real_call_depth; }
  ~RealCallScope() { --real_call_depth; }

  RealCallScope(const RealCallScope &) = delete;
  RealCallScope &operator=(const RealCallScope &) = delete;
};

bool IsRealCallActive() { return real_call_depth != 0; }

const char *ErrorName(int ssl_error) {
  switch (ssl_error) {
  case SSL_ERROR_SSL:
    return "SSL_ERROR_SSL";
  case SSL_ERROR_SYSCALL:
    return "SSL_ERROR_SYSCALL";
  default:
    return "unknown fatal error";
  }
}

[[noreturn]] void AbortContractViolation(const char *attempted_api,
                                         const FatalConnection &fatal) {
  std::fprintf(stderr,
               "OpenSSL contract assertion failed: %s called on SSL %p "
               "after %s returned %lld and SSL_get_error classified it as "
               "%s; no further I/O or SSL_shutdown is allowed\n",
               attempted_api, static_cast<const void *>(fatal.ssl),
               fatal.io_api, fatal.io_result, ErrorName(fatal.ssl_error));
  std::fflush(stderr);
  std::abort();
}

[[noreturn]] void AbortPendingOverflow(const PendingIoCall &call) {
  std::fprintf(stderr,
               "OpenSSL contract assertion failed: cannot track SSL %p "
               "after %s returned %lld; pending-I/O table is full\n",
               static_cast<const void *>(call.ssl), call.api, call.result);
  std::fflush(stderr);
  std::abort();
}

[[noreturn]] void AbortFatalOverflow(const PendingIoCall &call, int ssl_error) {
  std::fprintf(stderr,
               "OpenSSL contract assertion failed: cannot track SSL %p "
               "after %s returned %lld and SSL_get_error classified it as "
               "%s; fatal-connection table is full\n",
               static_cast<const void *>(call.ssl), call.api, call.result,
               ErrorName(ssl_error));
  std::fflush(stderr);
  std::abort();
}

PendingIoCall *FindPendingIoCall(const SSL *ssl) {
  for (PendingIoCall &call : pending_io_calls) {
    if (call.ssl == ssl) {
      return &call;
    }
  }
  return nullptr;
}

FatalConnection *FindFatalConnection(const SSL *ssl) {
  for (FatalConnection &fatal : fatal_connections) {
    if (fatal.ssl == ssl) {
      return &fatal;
    }
  }
  return nullptr;
}

void CheckUsable(const SSL *ssl, const char *attempted_api) {
  if (ssl == nullptr ||
      fatal_connection_count.load(std::memory_order_acquire) == 0) {
    return;
  }

  FatalConnection fatal;
  {
    std::lock_guard<std::mutex> lock(fatal_connections_mutex);
    const FatalConnection *tracked = FindFatalConnection(ssl);
    if (tracked != nullptr) {
      fatal = *tracked;
    }
  }
  if (fatal.ssl != nullptr) {
    AbortContractViolation(attempted_api, fatal);
  }
}

void ForgetPendingIoCall(const SSL *ssl) {
  if (ssl == nullptr ||
      pending_io_call_count.load(std::memory_order_acquire) == 0) {
    return;
  }

  std::lock_guard<std::mutex> lock(pending_io_calls_mutex);
  PendingIoCall *call = FindPendingIoCall(ssl);
  if (call != nullptr) {
    *call = PendingIoCall{};
    pending_io_call_count.fetch_sub(1, std::memory_order_release);
  }
}

void RecordIoResult(const SSL *ssl, const char *api, long long result,
                    bool zero_is_non_error = false) {
  if (ssl == nullptr) {
    return;
  }
  if (result > 0 || (zero_is_non_error && result == 0)) {
    ForgetPendingIoCall(ssl);
    return;
  }

  PendingIoCall recorded;
  recorded.ssl = ssl;
  recorded.api = api;
  recorded.result = result;
  bool table_full = false;
  bool added = false;
  {
    std::lock_guard<std::mutex> lock(pending_io_calls_mutex);
    PendingIoCall *call = FindPendingIoCall(ssl);
    if (call == nullptr) {
      for (PendingIoCall &entry : pending_io_calls) {
        if (entry.ssl == nullptr) {
          call = &entry;
          added = true;
          break;
        }
      }
    }
    if (call != nullptr) {
      *call = recorded;
      if (added) {
        pending_io_call_count.fetch_add(1, std::memory_order_release);
      }
    } else {
      table_full = true;
    }
  }
  if (table_full) {
    AbortPendingOverflow(recorded);
  }
}

void RecordSslError(const SSL *ssl, int io_result, int ssl_error) {
  if (ssl == nullptr ||
      pending_io_call_count.load(std::memory_order_acquire) == 0) {
    return;
  }

  PendingIoCall classified_call;
  {
    std::lock_guard<std::mutex> lock(pending_io_calls_mutex);
    PendingIoCall *pending = FindPendingIoCall(ssl);
    if (pending == nullptr || pending->result != io_result) {
      return;
    }
    classified_call = *pending;
    *pending = PendingIoCall{};
    pending_io_call_count.fetch_sub(1, std::memory_order_release);
  }
  if (ssl_error != SSL_ERROR_SSL && ssl_error != SSL_ERROR_SYSCALL) {
    return;
  }

  bool table_full = false;
  bool added = false;
  {
    std::lock_guard<std::mutex> lock(fatal_connections_mutex);
    FatalConnection *fatal = FindFatalConnection(ssl);
    if (fatal == nullptr) {
      for (FatalConnection &entry : fatal_connections) {
        if (entry.ssl == nullptr) {
          fatal = &entry;
          added = true;
          break;
        }
      }
    }
    if (fatal != nullptr) {
      fatal->ssl = ssl;
      fatal->io_api = classified_call.api;
      fatal->io_result = classified_call.result;
      fatal->ssl_error = ssl_error;
      if (added) {
        fatal_connection_count.fetch_add(1, std::memory_order_release);
      }
    } else {
      table_full = true;
    }
  }
  if (table_full) {
    AbortFatalOverflow(classified_call, ssl_error);
  }
}

void ForgetConnection(const SSL *ssl) {
  ForgetPendingIoCall(ssl);
  if (ssl == nullptr ||
      fatal_connection_count.load(std::memory_order_acquire) == 0) {
    return;
  }

  std::lock_guard<std::mutex> lock(fatal_connections_mutex);
  FatalConnection *fatal = FindFatalConnection(ssl);
  if (fatal != nullptr) {
    *fatal = FatalConnection{};
    fatal_connection_count.fetch_sub(1, std::memory_order_release);
  }
}

} // namespace

// GNU ld and lld provide each __real_* symbol when the final link uses the
// matching --wrap option. decltype ties these declarations to the installed
// OpenSSL headers and makes signature drift a compile-time failure.
extern "C" decltype(SSL_new) __real_SSL_new;
extern "C" decltype(SSL_free) __real_SSL_free;
extern "C" decltype(SSL_clear) __real_SSL_clear;
extern "C" decltype(SSL_get_error) __real_SSL_get_error;
extern "C" decltype(SSL_accept) __real_SSL_accept;
extern "C" decltype(SSL_connect) __real_SSL_connect;
extern "C" decltype(SSL_do_handshake) __real_SSL_do_handshake;
extern "C" decltype(SSL_read) __real_SSL_read;
extern "C" decltype(SSL_read_ex) __real_SSL_read_ex;
extern "C" decltype(SSL_read_early_data) __real_SSL_read_early_data;
extern "C" decltype(SSL_peek) __real_SSL_peek;
extern "C" decltype(SSL_peek_ex) __real_SSL_peek_ex;
extern "C" decltype(SSL_sendfile) __real_SSL_sendfile;
extern "C" decltype(SSL_write) __real_SSL_write;
extern "C" decltype(SSL_write_ex) __real_SSL_write_ex;
extern "C" decltype(SSL_write_ex2) __real_SSL_write_ex2;
extern "C" decltype(SSL_write_early_data) __real_SSL_write_early_data;
extern "C" decltype(SSL_shutdown) __real_SSL_shutdown;
extern "C" decltype(SSL_shutdown_ex) __real_SSL_shutdown_ex;

extern "C" SSL *__wrap_SSL_new(SSL_CTX *ctx) {
  if (IsRealCallActive()) {
    return __real_SSL_new(ctx);
  }
  SSL *ssl;
  {
    RealCallScope real_call;
    ssl = __real_SSL_new(ctx);
  }
  // OpenSSL's allocator may reuse a recently freed address.
  ForgetConnection(ssl);
  return ssl;
}
static_assert(std::is_same<decltype(SSL_new), decltype(__wrap_SSL_new)>::value,
              "SSL_new signature changed");

extern "C" void __wrap_SSL_free(SSL *ssl) {
  if (IsRealCallActive()) {
    __real_SSL_free(ssl);
    return;
  }
  ForgetConnection(ssl);
  RealCallScope real_call;
  __real_SSL_free(ssl);
}
static_assert(
    std::is_same<decltype(SSL_free), decltype(__wrap_SSL_free)>::value,
    "SSL_free signature changed");

extern "C" int __wrap_SSL_clear(SSL *ssl) {
  if (IsRealCallActive()) {
    return __real_SSL_clear(ssl);
  }
  int result;
  {
    RealCallScope real_call;
    result = __real_SSL_clear(ssl);
  }
  if (result == 1) {
    // A successful clear starts a new connection on the same SSL object.
    ForgetConnection(ssl);
  }
  return result;
}
static_assert(
    std::is_same<decltype(SSL_clear), decltype(__wrap_SSL_clear)>::value,
    "SSL_clear signature changed");

extern "C" int __wrap_SSL_get_error(const SSL *ssl, int io_result) {
  if (IsRealCallActive()) {
    return __real_SSL_get_error(ssl, io_result);
  }
  int ssl_error;
  {
    RealCallScope real_call;
    ssl_error = __real_SSL_get_error(ssl, io_result);
  }
  RecordSslError(ssl, io_result, ssl_error);
  return ssl_error;
}
static_assert(std::is_same<decltype(SSL_get_error),
                           decltype(__wrap_SSL_get_error)>::value,
              "SSL_get_error signature changed");

#define DEFINE_IO_WRAPPER_WITH_POLICY(name, parameters, arguments,             \
                                      zero_is_non_error)                       \
  extern "C" auto __wrap_##name parameters                                     \
      ->decltype(__real_##name arguments) {                                    \
    if (IsRealCallActive()) {                                                  \
      return __real_##name arguments;                                          \
    }                                                                          \
    CheckUsable(ssl, #name);                                                   \
    decltype(__real_##name arguments) result;                                  \
    {                                                                          \
      RealCallScope real_call;                                                 \
      result = __real_##name arguments;                                        \
    }                                                                          \
    RecordIoResult(ssl, #name, static_cast<long long>(result),                 \
                   zero_is_non_error);                                         \
    return result;                                                             \
  }                                                                            \
  static_assert(std::is_same<decltype(name), decltype(__wrap_##name)>::value,  \
                #name " signature changed");

#define DEFINE_IO_WRAPPER(name, parameters, arguments)                         \
  DEFINE_IO_WRAPPER_WITH_POLICY(name, parameters, arguments, false)

#define DEFINE_ZERO_NONERROR_WRAPPER(name, parameters, arguments)              \
  DEFINE_IO_WRAPPER_WITH_POLICY(name, parameters, arguments, true)

DEFINE_IO_WRAPPER(SSL_accept, (SSL * ssl), (ssl))
DEFINE_IO_WRAPPER(SSL_connect, (SSL * ssl), (ssl))
DEFINE_IO_WRAPPER(SSL_do_handshake, (SSL * ssl), (ssl))
DEFINE_IO_WRAPPER(SSL_read, (SSL * ssl, void *buffer, int length),
                  (ssl, buffer, length))
DEFINE_IO_WRAPPER(SSL_read_ex,
                  (SSL * ssl, void *buffer, size_t length, size_t *readbytes),
                  (ssl, buffer, length, readbytes))
DEFINE_IO_WRAPPER(SSL_read_early_data,
                  (SSL * ssl, void *buffer, size_t length, size_t *readbytes),
                  (ssl, buffer, length, readbytes))
DEFINE_IO_WRAPPER(SSL_peek, (SSL * ssl, void *buffer, int length),
                  (ssl, buffer, length))
DEFINE_IO_WRAPPER(SSL_peek_ex,
                  (SSL * ssl, void *buffer, size_t length, size_t *readbytes),
                  (ssl, buffer, length, readbytes))
DEFINE_ZERO_NONERROR_WRAPPER(SSL_sendfile,
                             (SSL * ssl, int fd, off_t offset, size_t size,
                              int flags),
                             (ssl, fd, offset, size, flags))
DEFINE_IO_WRAPPER(SSL_write, (SSL * ssl, const void *buffer, int length),
                  (ssl, buffer, length))
DEFINE_IO_WRAPPER(SSL_write_ex,
                  (SSL * ssl, const void *buffer, size_t length,
                   size_t *written),
                  (ssl, buffer, length, written))
DEFINE_IO_WRAPPER(SSL_write_ex2,
                  (SSL * ssl, const void *buffer, size_t length, uint64_t flags,
                   size_t *written),
                  (ssl, buffer, length, flags, written))
DEFINE_IO_WRAPPER(SSL_write_early_data,
                  (SSL * ssl, const void *buffer, size_t length,
                   size_t *written),
                  (ssl, buffer, length, written))
DEFINE_ZERO_NONERROR_WRAPPER(SSL_shutdown, (SSL * ssl), (ssl))
DEFINE_ZERO_NONERROR_WRAPPER(SSL_shutdown_ex,
                             (SSL * ssl, uint64_t flags,
                              const SSL_SHUTDOWN_EX_ARGS *args,
                              size_t args_length),
                             (ssl, flags, args, args_length))

#undef DEFINE_ZERO_NONERROR_WRAPPER
#undef DEFINE_IO_WRAPPER
#undef DEFINE_IO_WRAPPER_WITH_POLICY

Coverage Report

Created: 2026-10-15 06:18

Line	Count	Source
1		/*
2		* Copyright (C) Max Dymond, <cmeister2@gmail.com>, et al.
3		*
4		* SPDX-License-Identifier: curl
5		*/
6
7		#include <openssl/ssl.h>
8
9		#include <array>
10		#include <atomic>
11		#include <cstddef>
12		#include <cstdio>
13		#include <cstdlib>
14		#include <mutex>
15		#include <type_traits>
16
17		namespace {
18
19		// SSL_get_error classifies a preceding I/O result for one SSL object. Keep
20		// pending results keyed by that object so interleaved connections cannot
21		// replace one another's classification state.
22		struct PendingIoCall {
23		const SSL *ssl = nullptr;
24		const char *api = nullptr;
25		long long result = 0;
26		};
27
28		struct FatalConnection {
29		const SSL *ssl = nullptr;
30		const char *io_api = nullptr;
31		long long io_result = 0;
32		int ssl_error = SSL_ERROR_NONE;
33		};
34
35		// Fixed tables keep allocation-failure fuzzing from disabling or perturbing
36		// the monitor.
37		constexpr std::size_t kMaximumTrackedConnections = 256;
38		std::array<PendingIoCall, kMaximumTrackedConnections> pending_io_calls{};
39		std::mutex pending_io_calls_mutex;
40		std::atomic<std::size_t> pending_io_call_count{0};
41
42		constexpr std::size_t kMaximumFatalConnections = kMaximumTrackedConnections;
43		std::array<FatalConnection, kMaximumFatalConnections> fatal_connections{};
44		std::mutex fatal_connections_mutex;
45		std::atomic<std::size_t> fatal_connection_count{0};
46
47		// Static libssl contains calls to public SSL APIs. --wrap redirects those
48		// calls too, so calls made while a real OpenSSL function is running bypass the
49		// monitor and cannot replace the application call being classified.
50		thread_local unsigned real_call_depth = 0;
51
52		class RealCallScope {
53		public:
54	0	RealCallScope() { ++real_call_depth; }
55	0	~RealCallScope() { --real_call_depth; }
56
57		RealCallScope(const RealCallScope &) = delete;
58		RealCallScope &operator=(const RealCallScope &) = delete;
59		};
60
61	0	bool IsRealCallActive() { return real_call_depth != 0; }
62
63	0	const char *ErrorName(int ssl_error) {
64	0	switch (ssl_error) {
65	0	case SSL_ERROR_SSL:
66	0	return "SSL_ERROR_SSL";
67	0	case SSL_ERROR_SYSCALL:
68	0	return "SSL_ERROR_SYSCALL";
69	0	default:
70	0	return "unknown fatal error";
71	0	}
72	0	}
73
74		[[noreturn]] void AbortContractViolation(const char *attempted_api,
75	0	const FatalConnection &fatal) {
76	0	std::fprintf(stderr,
77	0	"OpenSSL contract assertion failed: %s called on SSL %p "
78	0	"after %s returned %lld and SSL_get_error classified it as "
79	0	"%s; no further I/O or SSL_shutdown is allowed\n",
80	0	attempted_api, static_cast<const void *>(fatal.ssl),
81	0	fatal.io_api, fatal.io_result, ErrorName(fatal.ssl_error));
82	0	std::fflush(stderr);
83	0	std::abort();
84	0	}
85
86	0	[[noreturn]] void AbortPendingOverflow(const PendingIoCall &call) {
87	0	std::fprintf(stderr,
88	0	"OpenSSL contract assertion failed: cannot track SSL %p "
89	0	"after %s returned %lld; pending-I/O table is full\n",
90	0	static_cast<const void *>(call.ssl), call.api, call.result);
91	0	std::fflush(stderr);
92	0	std::abort();
93	0	}
94
95	0	[[noreturn]] void AbortFatalOverflow(const PendingIoCall &call, int ssl_error) {
96	0	std::fprintf(stderr,
97	0	"OpenSSL contract assertion failed: cannot track SSL %p "
98	0	"after %s returned %lld and SSL_get_error classified it as "
99	0	"%s; fatal-connection table is full\n",
100	0	static_cast<const void *>(call.ssl), call.api, call.result,
101	0	ErrorName(ssl_error));
102	0	std::fflush(stderr);
103	0	std::abort();
104	0	}
105
106	0	PendingIoCall FindPendingIoCall(const SSL ssl) {
107	0	for (PendingIoCall &call : pending_io_calls) {
108	0	if (call.ssl == ssl) {
109	0	return &call;
110	0	}
111	0	}
112	0	return nullptr;
113	0	}
114
115	0	FatalConnection FindFatalConnection(const SSL ssl) {
116	0	for (FatalConnection &fatal : fatal_connections) {
117	0	if (fatal.ssl == ssl) {
118	0	return &fatal;
119	0	}
120	0	}
121	0	return nullptr;
122	0	}
123
124	0	void CheckUsable(const SSL ssl, const char attempted_api) {
125	0	if (ssl == nullptr \|\|
126	0	fatal_connection_count.load(std::memory_order_acquire) == 0) {
127	0	return;
128	0	}
129
130	0	FatalConnection fatal;
131	0	{
132	0	std::lock_guard<std::mutex> lock(fatal_connections_mutex);
133	0	const FatalConnection *tracked = FindFatalConnection(ssl);
134	0	if (tracked != nullptr) {
135	0	fatal = *tracked;
136	0	}
137	0	}
138	0	if (fatal.ssl != nullptr) {
139	0	AbortContractViolation(attempted_api, fatal);
140	0	}
141	0	}
142
143	0	void ForgetPendingIoCall(const SSL *ssl) {
144	0	if (ssl == nullptr \|\|
145	0	pending_io_call_count.load(std::memory_order_acquire) == 0) {
146	0	return;
147	0	}
148
149	0	std::lock_guard<std::mutex> lock(pending_io_calls_mutex);
150	0	PendingIoCall *call = FindPendingIoCall(ssl);
151	0	if (call != nullptr) {
152	0	*call = PendingIoCall{};
153	0	pending_io_call_count.fetch_sub(1, std::memory_order_release);
154	0	}
155	0	}
156
157		void RecordIoResult(const SSL ssl, const char api, long long result,
158	0	bool zero_is_non_error = false) {
159	0	if (ssl == nullptr) {
160	0	return;
161	0	}
162	0	if (result > 0 \|\| (zero_is_non_error && result == 0)) {
163	0	ForgetPendingIoCall(ssl);
164	0	return;
165	0	}
166
167	0	PendingIoCall recorded;
168	0	recorded.ssl = ssl;
169	0	recorded.api = api;
170	0	recorded.result = result;
171	0	bool table_full = false;
172	0	bool added = false;
173	0	{
174	0	std::lock_guard<std::mutex> lock(pending_io_calls_mutex);
175	0	PendingIoCall *call = FindPendingIoCall(ssl);
176	0	if (call == nullptr) {
177	0	for (PendingIoCall &entry : pending_io_calls) {
178	0	if (entry.ssl == nullptr) {
179	0	call = &entry;
180	0	added = true;
181	0	break;
182	0	}
183	0	}
184	0	}
185	0	if (call != nullptr) {
186	0	*call = recorded;
187	0	if (added) {
188	0	pending_io_call_count.fetch_add(1, std::memory_order_release);
189	0	}
190	0	} else {
191	0	table_full = true;
192	0	}
193	0	}
194	0	if (table_full) {
195	0	AbortPendingOverflow(recorded);
196	0	}
197	0	}
198
199	0	void RecordSslError(const SSL *ssl, int io_result, int ssl_error) {
200	0	if (ssl == nullptr \|\|
201	0	pending_io_call_count.load(std::memory_order_acquire) == 0) {
202	0	return;
203	0	}
204
205	0	PendingIoCall classified_call;
206	0	{
207	0	std::lock_guard<std::mutex> lock(pending_io_calls_mutex);
208	0	PendingIoCall *pending = FindPendingIoCall(ssl);
209	0	if (pending == nullptr \|\| pending->result != io_result) {
210	0	return;
211	0	}
212	0	classified_call = *pending;
213	0	*pending = PendingIoCall{};
214	0	pending_io_call_count.fetch_sub(1, std::memory_order_release);
215	0	}
216	0	if (ssl_error != SSL_ERROR_SSL && ssl_error != SSL_ERROR_SYSCALL) {
217	0	return;
218	0	}
219
220	0	bool table_full = false;
221	0	bool added = false;
222	0	{
223	0	std::lock_guard<std::mutex> lock(fatal_connections_mutex);
224	0	FatalConnection *fatal = FindFatalConnection(ssl);
225	0	if (fatal == nullptr) {
226	0	for (FatalConnection &entry : fatal_connections) {
227	0	if (entry.ssl == nullptr) {
228	0	fatal = &entry;
229	0	added = true;
230	0	break;
231	0	}
232	0	}
233	0	}
234	0	if (fatal != nullptr) {
235	0	fatal->ssl = ssl;
236	0	fatal->io_api = classified_call.api;
237	0	fatal->io_result = classified_call.result;
238	0	fatal->ssl_error = ssl_error;
239	0	if (added) {
240	0	fatal_connection_count.fetch_add(1, std::memory_order_release);
241	0	}
242	0	} else {
243	0	table_full = true;
244	0	}
245	0	}
246	0	if (table_full) {
247	0	AbortFatalOverflow(classified_call, ssl_error);
248	0	}
249	0	}
250
251	0	void ForgetConnection(const SSL *ssl) {
252	0	ForgetPendingIoCall(ssl);
253	0	if (ssl == nullptr \|\|
254	0	fatal_connection_count.load(std::memory_order_acquire) == 0) {
255	0	return;
256	0	}
257
258	0	std::lock_guard<std::mutex> lock(fatal_connections_mutex);
259	0	FatalConnection *fatal = FindFatalConnection(ssl);
260	0	if (fatal != nullptr) {
261	0	*fatal = FatalConnection{};
262	0	fatal_connection_count.fetch_sub(1, std::memory_order_release);
263	0	}
264	0	}
265
266		} // namespace
267
268		// GNU ld and lld provide each __real_* symbol when the final link uses the
269		// matching --wrap option. decltype ties these declarations to the installed
270		// OpenSSL headers and makes signature drift a compile-time failure.
271		extern "C" decltype(SSL_new) __real_SSL_new;
272		extern "C" decltype(SSL_free) __real_SSL_free;
273		extern "C" decltype(SSL_clear) __real_SSL_clear;
274		extern "C" decltype(SSL_get_error) __real_SSL_get_error;
275		extern "C" decltype(SSL_accept) __real_SSL_accept;
276		extern "C" decltype(SSL_connect) __real_SSL_connect;
277		extern "C" decltype(SSL_do_handshake) __real_SSL_do_handshake;
278		extern "C" decltype(SSL_read) __real_SSL_read;
279		extern "C" decltype(SSL_read_ex) __real_SSL_read_ex;
280		extern "C" decltype(SSL_read_early_data) __real_SSL_read_early_data;
281		extern "C" decltype(SSL_peek) __real_SSL_peek;
282		extern "C" decltype(SSL_peek_ex) __real_SSL_peek_ex;
283		extern "C" decltype(SSL_sendfile) __real_SSL_sendfile;
284		extern "C" decltype(SSL_write) __real_SSL_write;
285		extern "C" decltype(SSL_write_ex) __real_SSL_write_ex;
286		extern "C" decltype(SSL_write_ex2) __real_SSL_write_ex2;
287		extern "C" decltype(SSL_write_early_data) __real_SSL_write_early_data;
288		extern "C" decltype(SSL_shutdown) __real_SSL_shutdown;
289		extern "C" decltype(SSL_shutdown_ex) __real_SSL_shutdown_ex;
290
291	0	extern "C" SSL __wrap_SSL_new(SSL_CTX ctx) {
292	0	if (IsRealCallActive()) {
293	0	return __real_SSL_new(ctx);
294	0	}
295	0	SSL *ssl;
296	0	{
297	0	RealCallScope real_call;
298	0	ssl = __real_SSL_new(ctx);
299	0	}
300		// OpenSSL's allocator may reuse a recently freed address.
301	0	ForgetConnection(ssl);
302	0	return ssl;
303	0	}
304		static_assert(std::is_same<decltype(SSL_new), decltype(__wrap_SSL_new)>::value,
305		"SSL_new signature changed");
306
307	0	extern "C" void __wrap_SSL_free(SSL *ssl) {
308	0	if (IsRealCallActive()) {
309	0	__real_SSL_free(ssl);
310	0	return;
311	0	}
312	0	ForgetConnection(ssl);
313	0	RealCallScope real_call;
314	0	__real_SSL_free(ssl);
315	0	}
316		static_assert(
317		std::is_same<decltype(SSL_free), decltype(__wrap_SSL_free)>::value,
318		"SSL_free signature changed");
319
320	0	extern "C" int __wrap_SSL_clear(SSL *ssl) {
321	0	if (IsRealCallActive()) {
322	0	return __real_SSL_clear(ssl);
323	0	}
324	0	int result;
325	0	{
326	0	RealCallScope real_call;
327	0	result = __real_SSL_clear(ssl);
328	0	}
329	0	if (result == 1) {
330		// A successful clear starts a new connection on the same SSL object.
331	0	ForgetConnection(ssl);
332	0	}
333	0	return result;
334	0	}
335		static_assert(
336		std::is_same<decltype(SSL_clear), decltype(__wrap_SSL_clear)>::value,
337		"SSL_clear signature changed");
338
339	0	extern "C" int __wrap_SSL_get_error(const SSL *ssl, int io_result) {
340	0	if (IsRealCallActive()) {
341	0	return __real_SSL_get_error(ssl, io_result);
342	0	}
343	0	int ssl_error;
344	0	{
345	0	RealCallScope real_call;
346	0	ssl_error = __real_SSL_get_error(ssl, io_result);
347	0	}
348	0	RecordSslError(ssl, io_result, ssl_error);
349	0	return ssl_error;
350	0	}
351		static_assert(std::is_same<decltype(SSL_get_error),
352		decltype(__wrap_SSL_get_error)>::value,
353		"SSL_get_error signature changed");
354
355		#define DEFINE_IO_WRAPPER_WITH_POLICY(name, parameters, arguments, \
356		zero_is_non_error) \
357		extern "C" auto __wrap_##name parameters \
358	0	->decltype(__real_##name arguments) { \
359	0	if (IsRealCallActive()) { \
360	0	return __real_##name arguments; \
361	0	} \
362	0	CheckUsable(ssl, #name); \
363	0	decltype(__real_##name arguments) result; \
364	0	{ \
365	0	RealCallScope real_call; \
366	0	result = __real_##name arguments; \
367	0	} \
368	0	RecordIoResult(ssl, #name, static_cast<long long>(result), \
369	0	zero_is_non_error); \
370	0	return result; \
371	0	} \ Unexecuted instantiation: __wrap_SSL_accept Unexecuted instantiation: __wrap_SSL_connect Unexecuted instantiation: __wrap_SSL_do_handshake Unexecuted instantiation: __wrap_SSL_read Unexecuted instantiation: __wrap_SSL_read_ex Unexecuted instantiation: __wrap_SSL_read_early_data Unexecuted instantiation: __wrap_SSL_peek Unexecuted instantiation: __wrap_SSL_peek_ex Unexecuted instantiation: __wrap_SSL_sendfile Unexecuted instantiation: __wrap_SSL_write Unexecuted instantiation: __wrap_SSL_write_ex Unexecuted instantiation: __wrap_SSL_write_ex2 Unexecuted instantiation: __wrap_SSL_write_early_data Unexecuted instantiation: __wrap_SSL_shutdown Unexecuted instantiation: __wrap_SSL_shutdown_ex
372		static_assert(std::is_same<decltype(name), decltype(__wrap_##name)>::value, \
373		#name " signature changed");
374
375		#define DEFINE_IO_WRAPPER(name, parameters, arguments) \
376		DEFINE_IO_WRAPPER_WITH_POLICY(name, parameters, arguments, false)
377
378		#define DEFINE_ZERO_NONERROR_WRAPPER(name, parameters, arguments) \
379		DEFINE_IO_WRAPPER_WITH_POLICY(name, parameters, arguments, true)
380
381		DEFINE_IO_WRAPPER(SSL_accept, (SSL * ssl), (ssl))
382		DEFINE_IO_WRAPPER(SSL_connect, (SSL * ssl), (ssl))
383		DEFINE_IO_WRAPPER(SSL_do_handshake, (SSL * ssl), (ssl))
384		DEFINE_IO_WRAPPER(SSL_read, (SSL * ssl, void *buffer, int length),
385		(ssl, buffer, length))
386		DEFINE_IO_WRAPPER(SSL_read_ex,
387		(SSL * ssl, void buffer, size_t length, size_t readbytes),
388		(ssl, buffer, length, readbytes))
389		DEFINE_IO_WRAPPER(SSL_read_early_data,
390		(SSL * ssl, void buffer, size_t length, size_t readbytes),
391		(ssl, buffer, length, readbytes))
392		DEFINE_IO_WRAPPER(SSL_peek, (SSL * ssl, void *buffer, int length),
393		(ssl, buffer, length))
394		DEFINE_IO_WRAPPER(SSL_peek_ex,
395		(SSL * ssl, void buffer, size_t length, size_t readbytes),
396		(ssl, buffer, length, readbytes))
397		DEFINE_ZERO_NONERROR_WRAPPER(SSL_sendfile,
398		(SSL * ssl, int fd, off_t offset, size_t size,
399		int flags),
400		(ssl, fd, offset, size, flags))
401		DEFINE_IO_WRAPPER(SSL_write, (SSL * ssl, const void *buffer, int length),
402		(ssl, buffer, length))
403		DEFINE_IO_WRAPPER(SSL_write_ex,
404		(SSL * ssl, const void *buffer, size_t length,
405		size_t *written),
406		(ssl, buffer, length, written))
407		DEFINE_IO_WRAPPER(SSL_write_ex2,
408		(SSL * ssl, const void *buffer, size_t length, uint64_t flags,
409		size_t *written),
410		(ssl, buffer, length, flags, written))
411		DEFINE_IO_WRAPPER(SSL_write_early_data,
412		(SSL * ssl, const void *buffer, size_t length,
413		size_t *written),
414		(ssl, buffer, length, written))
415		DEFINE_ZERO_NONERROR_WRAPPER(SSL_shutdown, (SSL * ssl), (ssl))
416		DEFINE_ZERO_NONERROR_WRAPPER(SSL_shutdown_ex,
417		(SSL * ssl, uint64_t flags,
418		const SSL_SHUTDOWN_EX_ARGS *args,
419		size_t args_length),
420		(ssl, flags, args, args_length))
421
422		#undef DEFINE_ZERO_NONERROR_WRAPPER
423		#undef DEFINE_IO_WRAPPER
424		#undef DEFINE_IO_WRAPPER_WITH_POLICY