File nghttp2-CVE-2023-44487.patch of Package nghttp2.33194
Index: nghttp2-1.40.0/CMakeLists.txt
===================================================================
--- nghttp2-1.40.0.orig/CMakeLists.txt
+++ nghttp2-1.40.0/CMakeLists.txt
@@ -264,6 +264,7 @@ check_include_file("netinet/in.h" HAVE
check_include_file("pwd.h" HAVE_PWD_H)
check_include_file("sys/socket.h" HAVE_SYS_SOCKET_H)
check_include_file("sys/time.h" HAVE_SYS_TIME_H)
+check_include_file("sysinfoapi.h" HAVE_SYSINFOAPI_H)
check_include_file("syslog.h" HAVE_SYSLOG_H)
check_include_file("time.h" HAVE_TIME_H)
check_include_file("unistd.h" HAVE_UNISTD_H)
@@ -304,8 +305,11 @@ check_type_size("time_t" SIZEOF_TIME_T)
include(CheckFunctionExists)
check_function_exists(_Exit HAVE__EXIT)
check_function_exists(accept4 HAVE_ACCEPT4)
+check_function_exists(clock_gettime HAVE_CLOCK_GETTIME)
check_function_exists(mkostemp HAVE_MKOSTEMP)
+check_symbol_exists(GetTickCount64 sysinfoapi.h HAVE_GETTICKCOUNT64)
+
include(CheckSymbolExists)
# XXX does this correctly detect initgroups (un)availability on cygwin?
check_symbol_exists(initgroups grp.h HAVE_DECL_INITGROUPS)
Index: nghttp2-1.40.0/cmakeconfig.h.in
===================================================================
--- nghttp2-1.40.0.orig/cmakeconfig.h.in
+++ nghttp2-1.40.0/cmakeconfig.h.in
@@ -34,9 +34,15 @@
/* Define to 1 if you have the `accept4` function. */
#cmakedefine HAVE_ACCEPT4 1
+/* Define to 1 if you have the `clock_gettime` function. */
+#cmakedefine HAVE_CLOCK_GETTIME 1
+
/* Define to 1 if you have the `mkostemp` function. */
#cmakedefine HAVE_MKOSTEMP 1
+/* Define to 1 if you have the `GetTickCount64` function. */
+#cmakedefine HAVE_GETTICKCOUNT64 1
+
/* Define to 1 if you have the `initgroups` function. */
#cmakedefine01 HAVE_DECL_INITGROUPS
@@ -73,6 +79,9 @@
/* Define to 1 if you have the <sys/time.h> header file. */
#cmakedefine HAVE_SYS_TIME_H 1
+/* Define to 1 if you have the <sysinfoapi.h> header file. */
+#cmakedefine HAVE_SYSINFOAPI_H 1
+
/* Define to 1 if you have the <syslog.h> header file. */
#cmakedefine HAVE_SYSLOG_H 1
Index: nghttp2-1.40.0/configure.ac
===================================================================
--- nghttp2-1.40.0.orig/configure.ac
+++ nghttp2-1.40.0/configure.ac
@@ -607,6 +607,7 @@ AC_CHECK_HEADERS([ \
string.h \
sys/socket.h \
sys/time.h \
+ sysinfoapi.h \
syslog.h \
time.h \
unistd.h \
@@ -681,6 +682,7 @@ AC_FUNC_STRNLEN
AC_CHECK_FUNCS([ \
_Exit \
accept4 \
+ clock_gettime \
dup2 \
getcwd \
getpwnam \
@@ -706,6 +708,25 @@ AC_CHECK_FUNCS([ \
AC_CHECK_FUNC([timerfd_create],
[have_timerfd_create=yes], [have_timerfd_create=no])
+AC_MSG_CHECKING([checking for GetTickCount64])
+AC_LINK_IFELSE([AC_LANG_PROGRAM(
+[[
+#include <sysinfoapi.h>
+]],
+[[
+GetTickCount64();
+]])],
+[have_gettickcount64=yes],
+[have_gettickcount64=no])
+
+if test "x${have_gettickcount64}" = "xyes"; then
+ AC_MSG_RESULT([yes])
+ AC_DEFINE([HAVE_GETTICKCOUNT64], [1],
+ [Define to 1 if you have `GetTickCount64` function.])
+else
+ AC_MSG_RESULT([no])
+fi
+
# For cygwin: we can link initgroups, so AC_CHECK_FUNCS succeeds, but
# cygwin disables initgroups due to feature test macro magic with our
# configuration. FreeBSD declares initgroups() in unistd.h.
Index: nghttp2-1.40.0/doc/Makefile.am
===================================================================
--- nghttp2-1.40.0.orig/doc/Makefile.am
+++ nghttp2-1.40.0/doc/Makefile.am
@@ -70,6 +70,7 @@ APIDOCS= \
nghttp2_option_set_user_recv_extension_type.rst \
nghttp2_option_set_max_outbound_ack.rst \
nghttp2_option_set_max_settings.rst \
+ nghttp2_option_set_stream_reset_rate_limit.rst \
nghttp2_pack_settings_payload.rst \
nghttp2_priority_spec_check_default.rst \
nghttp2_priority_spec_default_init.rst \
Index: nghttp2-1.40.0/lib/CMakeLists.txt
===================================================================
--- nghttp2-1.40.0.orig/lib/CMakeLists.txt
+++ nghttp2-1.40.0/lib/CMakeLists.txt
@@ -23,6 +23,8 @@ set(NGHTTP2_SOURCES
nghttp2_mem.c
nghttp2_http.c
nghttp2_rcbuf.c
+ nghttp2_ratelim.c
+ nghttp2_time.c
nghttp2_debug.c
)
Index: nghttp2-1.40.0/lib/Makefile.am
===================================================================
--- nghttp2-1.40.0.orig/lib/Makefile.am
+++ nghttp2-1.40.0/lib/Makefile.am
@@ -49,6 +49,8 @@ OBJECTS = nghttp2_pq.c nghttp2_map.c ngh
nghttp2_mem.c \
nghttp2_http.c \
nghttp2_rcbuf.c \
+ nghttp2_ratelim.c \
+ nghttp2_time.c \
nghttp2_debug.c
HFILES = nghttp2_pq.h nghttp2_int.h nghttp2_map.h nghttp2_queue.h \
@@ -65,6 +67,8 @@ HFILES = nghttp2_pq.h nghttp2_int.h nght
nghttp2_mem.h \
nghttp2_http.h \
nghttp2_rcbuf.h \
+ nghttp2_ratelim.h \
+ nghttp2_time.h \
nghttp2_debug.h
libnghttp2_la_SOURCES = $(HFILES) $(OBJECTS)
Index: nghttp2-1.40.0/lib/includes/nghttp2/nghttp2.h
===================================================================
--- nghttp2-1.40.0.orig/lib/includes/nghttp2/nghttp2.h
+++ nghttp2-1.40.0/lib/includes/nghttp2/nghttp2.h
@@ -2763,6 +2763,23 @@ nghttp2_session_client_new2(nghttp2_sess
/**
* @function
*
+ * This function sets the rate limit for the incoming stream reset
+ * (RST_STREAM frame). It is server use only. It is a token-bucket
+ * based rate limiter. |burst| specifies the number of tokens that is
+ * initially available. The maximum number of tokens is capped to
+ * this value. |rate| specifies the number of tokens that are
+ * regenerated per second. An incoming RST_STREAM consumes one token.
+ * If there is no token available, GOAWAY is sent to tear down the
+ * connection. |burst| and |rate| default to 1000 and 33
+ * respectively.
+ */
+NGHTTP2_EXTERN void
+nghttp2_option_set_stream_reset_rate_limit(nghttp2_option *option,
+ uint64_t burst, uint64_t rate);
+
+/**
+ * @function
+ *
* Like `nghttp2_session_server_new()`, but with additional options
* specified in the |option|.
*
Index: nghttp2-1.40.0/lib/nghttp2_option.c
===================================================================
--- nghttp2-1.40.0.orig/lib/nghttp2_option.c
+++ nghttp2-1.40.0/lib/nghttp2_option.c
@@ -126,3 +126,10 @@ void nghttp2_option_set_max_settings(ngh
option->opt_set_mask |= NGHTTP2_OPT_MAX_SETTINGS;
option->max_settings = val;
}
+
+void nghttp2_option_set_stream_reset_rate_limit(nghttp2_option *option,
+ uint64_t burst, uint64_t rate) {
+ option->opt_set_mask |= NGHTTP2_OPT_STREAM_RESET_RATE_LIMIT;
+ option->stream_reset_burst = burst;
+ option->stream_reset_rate = rate;
+}
Index: nghttp2-1.40.0/lib/nghttp2_option.h
===================================================================
--- nghttp2-1.40.0.orig/lib/nghttp2_option.h
+++ nghttp2-1.40.0/lib/nghttp2_option.h
@@ -68,6 +68,7 @@ typedef enum {
NGHTTP2_OPT_NO_CLOSED_STREAMS = 1 << 10,
NGHTTP2_OPT_MAX_OUTBOUND_ACK = 1 << 11,
NGHTTP2_OPT_MAX_SETTINGS = 1 << 12,
+ NGHTTP2_OPT_STREAM_RESET_RATE_LIMIT = 1 << 15,
} nghttp2_option_flag;
/**
@@ -75,6 +76,11 @@ typedef enum {
*/
struct nghttp2_option {
/**
+ * NGHTTP2_OPT_STREAM_RESET_RATE_LIMIT
+ */
+ uint64_t stream_reset_burst;
+ uint64_t stream_reset_rate;
+ /**
* NGHTTP2_OPT_MAX_SEND_HEADER_BLOCK_LENGTH
*/
size_t max_send_header_block_length;
Index: nghttp2-1.40.0/lib/nghttp2_ratelim.c
===================================================================
--- /dev/null
+++ nghttp2-1.40.0/lib/nghttp2_ratelim.c
@@ -0,0 +1,75 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2023 nghttp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "nghttp2_ratelim.h"
+#include "nghttp2_helper.h"
+
+void nghttp2_ratelim_init(nghttp2_ratelim *rl, uint64_t burst, uint64_t rate) {
+ rl->val = rl->burst = burst;
+ rl->rate = rate;
+ rl->tstamp = 0;
+}
+
+void nghttp2_ratelim_update(nghttp2_ratelim *rl, uint64_t tstamp) {
+ uint64_t d, gain;
+
+ if (tstamp == rl->tstamp) {
+ return;
+ }
+
+ if (tstamp > rl->tstamp) {
+ d = tstamp - rl->tstamp;
+ } else {
+ d = 1;
+ }
+
+ rl->tstamp = tstamp;
+
+ if (UINT64_MAX / d < rl->rate) {
+ rl->val = rl->burst;
+
+ return;
+ }
+
+ gain = rl->rate * d;
+
+ if (UINT64_MAX - gain < rl->val) {
+ rl->val = rl->burst;
+
+ return;
+ }
+
+ rl->val += gain;
+ rl->val = nghttp2_min(rl->val, rl->burst);
+}
+
+int nghttp2_ratelim_drain(nghttp2_ratelim *rl, uint64_t n) {
+ if (rl->val < n) {
+ return -1;
+ }
+
+ rl->val -= n;
+
+ return 0;
+}
Index: nghttp2-1.40.0/lib/nghttp2_ratelim.h
===================================================================
--- /dev/null
+++ nghttp2-1.40.0/lib/nghttp2_ratelim.h
@@ -0,0 +1,57 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2023 nghttp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef NGHTTP2_RATELIM_H
+#define NGHTTP2_RATELIM_H
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <nghttp2/nghttp2.h>
+
+typedef struct nghttp2_ratelim {
+ /* burst is the maximum value of val. */
+ uint64_t burst;
+ /* rate is the amount of value that is regenerated per 1 tstamp. */
+ uint64_t rate;
+ /* val is the amount of value available to drain. */
+ uint64_t val;
+ /* tstamp is the last timestamp in second resolution that is known
+ to this object. */
+ uint64_t tstamp;
+} nghttp2_ratelim;
+
+/* nghttp2_ratelim_init initializes |rl| with the given parameters. */
+void nghttp2_ratelim_init(nghttp2_ratelim *rl, uint64_t burst, uint64_t rate);
+
+/* nghttp2_ratelim_update updates rl->val with the current |tstamp|
+ given in second resolution. */
+void nghttp2_ratelim_update(nghttp2_ratelim *rl, uint64_t tstamp);
+
+/* nghttp2_ratelim_drain drains |n| from rl->val. It returns 0 if it
+ succeeds, or -1. */
+int nghttp2_ratelim_drain(nghttp2_ratelim *rl, uint64_t n);
+
+#endif /* NGHTTP2_RATELIM_H */
Index: nghttp2-1.40.0/lib/nghttp2_session.c
===================================================================
--- nghttp2-1.40.0.orig/lib/nghttp2_session.c
+++ nghttp2-1.40.0/lib/nghttp2_session.c
@@ -36,6 +36,7 @@
#include "nghttp2_option.h"
#include "nghttp2_http.h"
#include "nghttp2_pq.h"
+#include "nghttp2_time.h"
#include "nghttp2_debug.h"
/*
@@ -443,6 +444,10 @@ static int session_new(nghttp2_session *
NGHTTP2_DEFAULT_MAX_CONCURRENT_STREAMS;
(*session_ptr)->pending_enable_push = 1;
+ nghttp2_ratelim_init(&(*session_ptr)->stream_reset_ratelim,
+ NGHTTP2_DEFAULT_STREAM_RESET_BURST,
+ NGHTTP2_DEFAULT_STREAM_RESET_RATE);
+
if (server) {
(*session_ptr)->server = 1;
}
@@ -527,6 +532,12 @@ static int session_new(nghttp2_session *
option->max_settings) {
(*session_ptr)->max_settings = option->max_settings;
}
+
+ if (option->opt_set_mask & NGHTTP2_OPT_STREAM_RESET_RATE_LIMIT) {
+ nghttp2_ratelim_init(&(*session_ptr)->stream_reset_ratelim,
+ option->stream_reset_burst,
+ option->stream_reset_rate);
+ }
}
rv = nghttp2_hd_deflate_init2(&(*session_ptr)->hd_deflater,
@@ -4149,6 +4160,23 @@ static int session_process_priority_fram
return nghttp2_session_on_priority_received(session, frame);
}
+static int session_update_stream_reset_ratelim(nghttp2_session *session) {
+ if (!session->server || (session->goaway_flags & NGHTTP2_GOAWAY_SUBMITTED)) {
+ return 0;
+ }
+
+ nghttp2_ratelim_update(&session->stream_reset_ratelim,
+ nghttp2_time_now_sec());
+
+ if (nghttp2_ratelim_drain(&session->stream_reset_ratelim, 1) == 0) {
+ return 0;
+ }
+
+ return nghttp2_session_add_goaway(session, session->last_recv_stream_id,
+ NGHTTP2_INTERNAL_ERROR, NULL, 0,
+ NGHTTP2_GOAWAY_AUX_NONE);
+}
+
int nghttp2_session_on_rst_stream_received(nghttp2_session *session,
nghttp2_frame *frame) {
int rv;
@@ -4178,7 +4206,8 @@ int nghttp2_session_on_rst_stream_receiv
if (nghttp2_is_fatal(rv)) {
return rv;
}
- return 0;
+
+ return session_update_stream_reset_ratelim(session);
}
static int session_process_rst_stream_frame(nghttp2_session *session) {
@@ -7002,6 +7031,9 @@ int nghttp2_session_add_window_update(ng
nghttp2_mem_free(mem, item);
return rv;
}
+
+ session->goaway_flags |= NGHTTP2_GOAWAY_SUBMITTED;
+
return 0;
}
Index: nghttp2-1.40.0/lib/nghttp2_session.h
===================================================================
--- nghttp2-1.40.0.orig/lib/nghttp2_session.h
+++ nghttp2-1.40.0/lib/nghttp2_session.h
@@ -39,6 +39,7 @@
#include "nghttp2_buf.h"
#include "nghttp2_callbacks.h"
#include "nghttp2_mem.h"
+#include "nghttp2_ratelim.h"
/* The global variable for tests where we want to disable strict
preface handling. */
@@ -102,6 +103,10 @@ typedef struct {
/* The default value of maximum number of concurrent streams. */
#define NGHTTP2_DEFAULT_MAX_CONCURRENT_STREAMS 0xffffffffu
+/* The default values for stream reset rate limiter. */
+#define NGHTTP2_DEFAULT_STREAM_RESET_BURST 1000
+#define NGHTTP2_DEFAULT_STREAM_RESET_RATE 33
+
/* Internal state when receiving incoming frame */
typedef enum {
/* Receiving frame header */
@@ -176,7 +181,9 @@ typedef enum {
/* Flag means GOAWAY was sent */
NGHTTP2_GOAWAY_SENT = 0x4,
/* Flag means GOAWAY was received */
- NGHTTP2_GOAWAY_RECV = 0x8
+ NGHTTP2_GOAWAY_RECV = 0x8,
+ /* Flag means GOAWAY has been submitted at least once */
+ NGHTTP2_GOAWAY_SUBMITTED = 0x10
} nghttp2_goaway_flag;
/* nghttp2_inflight_settings stores the SETTINGS entries which local
@@ -227,6 +234,9 @@ struct nghttp2_session {
/* Queue of In-flight SETTINGS values. SETTINGS bearing ACK is not
considered as in-flight. */
nghttp2_inflight_settings *inflight_settings_head;
+ /* Stream reset rate limiter. If receiving excessive amount of
+ stream resets, GOAWAY will be sent. */
+ nghttp2_ratelim stream_reset_ratelim;
/* The number of outgoing streams. This will be capped by
remote_settings.max_concurrent_streams. */
size_t num_outgoing_streams;
Index: nghttp2-1.40.0/lib/nghttp2_time.c
===================================================================
--- /dev/null
+++ nghttp2-1.40.0/lib/nghttp2_time.c
@@ -0,0 +1,62 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2023 nghttp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "nghttp2_time.h"
+
+#ifdef HAVE_TIME_H
+# include <time.h>
+#endif /* HAVE_TIME_H */
+
+#ifdef HAVE_SYSINFOAPI_H
+# include <sysinfoapi.h>
+#endif /* HAVE_SYSINFOAPI_H */
+
+#ifndef HAVE_GETTICKCOUNT64
+static uint64_t time_now_sec(void) {
+ time_t t = time(NULL);
+
+ if (t == -1) {
+ return 0;
+ }
+
+ return (uint64_t)t;
+}
+#endif /* HAVE_GETTICKCOUNT64 */
+
+#ifdef HAVE_CLOCK_GETTIME
+uint64_t nghttp2_time_now_sec(void) {
+ struct timespec tp;
+ int rv = clock_gettime(CLOCK_MONOTONIC, &tp);
+
+ if (rv == -1) {
+ return time_now_sec();
+ }
+
+ return (uint64_t)tp.tv_sec;
+}
+#elif defined(HAVE_GETTICKCOUNT64)
+uint64_t nghttp2_time_now_sec(void) { return GetTickCount64() / 1000; }
+#else /* !HAVE_CLOCK_GETTIME && !HAVE_GETTICKCOUNT64 */
+uint64_t nghttp2_time_now_sec(void) { return time_now_sec(); }
+#endif /* !HAVE_CLOCK_GETTIME && !HAVE_GETTICKCOUNT64 */
Index: nghttp2-1.40.0/lib/nghttp2_time.h
===================================================================
--- /dev/null
+++ nghttp2-1.40.0/lib/nghttp2_time.h
@@ -0,0 +1,38 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2023 nghttp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef NGHTTP2_TIME_H
+#define NGHTTP2_TIME_H
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <nghttp2/nghttp2.h>
+
+/* nghttp2_time_now_sec returns seconds from implementation-specific
+ timepoint. If it is unable to get seconds, it returns 0. */
+uint64_t nghttp2_time_now_sec(void);
+
+#endif /* NGHTTP2_TIME_H */
