From ef4ff4252ac9c04f8c028f5518fa7088dc3b4f98 Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Mon, 28 Mar 2016 18:59:09 +0100
Subject: [PATCH 1/2] connection_basic: avoid gratuitous exception
The remote endpoint is usually invalid, so use a version of the
call that returns an error code instead.
---
src/p2p/connection_basic.cpp | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/p2p/connection_basic.cpp b/src/p2p/connection_basic.cpp
index c0b73bc3e..df702134e 100644
--- a/src/p2p/connection_basic.cpp
+++ b/src/p2p/connection_basic.cpp
@@ -161,7 +161,7 @@ connection_basic::connection_basic(boost::asio::io_service& io_service, std::ato
mI->m_peer_number = sock_number.fetch_add(1); // use, and increase the generated number
string remote_addr_str = "?";
- try { remote_addr_str = socket_.remote_endpoint().address().to_string(); } catch(...){} ;
+ try { boost::system::error_code e; remote_addr_str = socket_.remote_endpoint(e).address().to_string(); } catch(...){} ;
_note("Spawned connection p2p#"<<mI->m_peer_number<<" to " << remote_addr_str << " currently we have sockets count:" << m_ref_sock_count);
//boost::filesystem::create_directories("log/dr-monero/net/");
@@ -170,7 +170,7 @@ connection_basic::connection_basic(boost::asio::io_service& io_service, std::ato
connection_basic::~connection_basic() {
string remote_addr_str = "?";
m_ref_sock_count--;
- try { remote_addr_str = socket_.remote_endpoint().address().to_string(); } catch(...){} ;
+ try { boost::system::error_code e; remote_addr_str = socket_.remote_endpoint(e).address().to_string(); } catch(...){} ;
_note("Destructing connection p2p#"<<mI->m_peer_number << " to " << remote_addr_str);
}
From e409e59d29cd8f8480947d80582ac8e93b495e22 Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Mon, 28 Mar 2016 19:00:18 +0100
Subject: [PATCH 2/2] Print stack trace on exceptions
if libunwind is found.
Useful for debugging logs.
---
CMakeLists.txt | 18 ++++++
src/common/CMakeLists.txt | 7 ++-
src/common/stack_trace.cpp | 120 +++++++++++++++++++++++++++++++++++++
src/common/stack_trace.h | 43 +++++++++++++
src/daemon/main.cpp | 2 +
5 files changed, 188 insertions(+), 2 deletions(-)
create mode 100644 src/common/stack_trace.cpp
create mode 100644 src/common/stack_trace.h
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9674404bb..09ca449d5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -243,6 +243,14 @@ endif()
add_definitions("-DBLOCKCHAIN_DB=${BLOCKCHAIN_DB}")
+find_package(Libunwind)
+if(LIBUNWIND_FOUND)
+ message(STATUS "Using libunwind to provide stack traces")
+ add_definitions("-DHAVE_LIBUNWIND")
+else()
+ message(STATUS "Stack traces disabled")
+endif()
+
if (UNIX AND NOT APPLE)
# Note that at the time of this writing the -Wstrict-prototypes flag added below will make this fail
set(THREADS_PREFER_PTHREAD_FLAG ON)
@@ -274,6 +282,10 @@ if (BERKELEY_DB)
include_directories(${BDB_INCLUDE})
endif()
+# Final setup for libunwind
+include_directories(${LIBUNWIND_INCLUDE})
+link_directories(${LIBUNWIND_LIBRARY_DIRS})
+
if(MSVC)
add_definitions("/bigobj /MP /W3 /GS- /D_CRT_SECURE_NO_WARNINGS /wd4996 /wd4345 /D_WIN32_WINNT=0x0600 /DWIN32_LEAN_AND_MEAN /DGTEST_HAS_TR1_TUPLE=0 /FIinline_c.h /D__SSE4_1__")
# set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /Dinline=__inline")
@@ -394,6 +406,7 @@ else()
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${RELEASE_FLAGS}")
if(STATIC AND NOT APPLE AND NOT FREEBSD AND NOT OPENBSD)
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static-libgcc -static-libstdc++")
+ set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--wrap=__cxa_throw")
endif()
endif()
@@ -431,6 +444,11 @@ elseif(NOT MSVC)
set(EXTRA_LIBRARIES ${RT})
endif()
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+ find_library(DL dl)
+ set(EXTRA_LIBRARIES ${DL})
+endif()
+
include(version.cmake)
add_subdirectory(contrib)
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 2289704e5..9afbe4b82 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -31,7 +31,8 @@ set(common_sources
command_line.cpp
dns_utils.cpp
util.cpp
- i18n.cpp)
+ i18n.cpp
+ stack_trace.cpp)
set(common_headers)
@@ -48,7 +49,8 @@ set(common_private_headers
unordered_containers_boost_serialization.h
util.h
varint.h
- i18n.h)
+ i18n.h
+ stack_trace.h)
bitmonero_private_headers(common
${common_private_headers})
@@ -60,6 +62,7 @@ target_link_libraries(common
LINK_PRIVATE
crypto
${UNBOUND_LIBRARY}
+ ${LIBUNWIND_LIBRARIES}
${Boost_DATE_TIME_LIBRARY}
${Boost_FILESYSTEM_LIBRARY}
${Boost_SYSTEM_LIBRARY}
diff --git a/src/common/stack_trace.cpp b/src/common/stack_trace.cpp
new file mode 100644
index 000000000..1a65ca656
--- /dev/null
+++ b/src/common/stack_trace.cpp
@@ -0,0 +1,120 @@
+// Copyright (c) 2016, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+// conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+// of conditions and the following disclaimer in the documentation and/or other
+// materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+// used to endorse or promote products derived from this software without specific
+// prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "common/stack_trace.h"
+#include "misc_log_ex.h"
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+#include <cxxabi.h>
+#include <dlfcn.h>
+
+// from http://stackoverflow.com/questions/11665829/how-can-i-print-stack-trace-for-caught-exceptions-in-c-code-injection-in-c
+#ifdef STATICLIB
+#define CXA_THROW __wrap___cxa_throw
+extern "C" void __real___cxa_throw(void *ex, void *info, void (*dest)(void*));
+#else
+#define CXA_THROW __cxa_throw
+#endif
+
+extern "C" void CXA_THROW(void *ex, void *info, void (*dest)(void*))
+{
+
+ int status;
+ char *dsym = abi::__cxa_demangle(((const std::type_info*)info)->name(), NULL, NULL, &status);
+ tools::log_stack_trace((std::string("Exception: ")+((!status && dsym) ? dsym : (const char*)info)).c_str());
+ free(dsym);
+
+#ifdef STATICLIB
+ __real___cxa_throw(ex, info, dest);
+#else
+ static void (*const rethrow)(void*, void*, void(*)(void*)) __attribute__((noreturn)) = (void(*)(void*, void*, void(*)(void*)))dlsym(RTLD_NEXT, "__cxa_throw");
+ rethrow(ex, info, dest);
+#endif
+}
+
+namespace
+{
+ std::string stack_trace_log;
+}
+
+namespace tools
+{
+
+void set_stack_trace_log(const std::string &log)
+{
+ stack_trace_log = log;
+}
+
+void log_stack_trace(const char *msg)
+{
+#ifdef HAVE_LIBUNWIND
+ unw_context_t ctx;
+ unw_cursor_t cur;
+ unw_word_t ip, off;
+ unsigned level;
+ char sym[512], *dsym;
+ int status;
+ const char *log = stack_trace_log.empty() ? NULL : stack_trace_log.c_str();
+
+ if (msg)
+ LOG_PRINT2(log, msg, LOG_LEVEL_0);
+ LOG_PRINT2(log, "Unwinded call stack:", LOG_LEVEL_0);
+ if (unw_getcontext(&ctx) < 0) {
+ LOG_PRINT2(log, "Failed to create unwind context", LOG_LEVEL_0);
+ return;
+ }
+ if (unw_init_local(&cur, &ctx) < 0) {
+ LOG_PRINT2(log, "Failed to find the first unwind frame", LOG_LEVEL_0);
+ return;
+ }
+ for (level = 1; level < 999; ++level) { // 999 for safety
+ int ret = unw_step(&cur);
+ if (ret < 0) {
+ LOG_PRINT2(log, "Failed to find the next frame", LOG_LEVEL_0);
+ return;
+ }
+ if (ret == 0)
+ break;
+ if (unw_get_reg(&cur, UNW_REG_IP, &ip) < 0) {
+ LOG_PRINT2(log, " " << std::setw(4) << level, LOG_LEVEL_0);
+ continue;
+ }
+ if (unw_get_proc_name(&cur, sym, sizeof(sym), &off) < 0) {
+ LOG_PRINT2(log, " " << std::setw(4) << level << std::setbase(16) << std::setw(20) << "0x" << ip, LOG_LEVEL_0);
+ continue;
+ }
+ dsym = abi::__cxa_demangle(sym, NULL, NULL, &status);
+ LOG_PRINT2(log, " " << std::setw(4) << level << std::setbase(16) << std::setw(20) << "0x" << ip << " " << (!status && dsym ? dsym : sym) << " + " << "0x" << off, LOG_LEVEL_0);
+ free(dsym);
+ }
+#else
+#warning libunwind disabled, no stack traces
+#endif
+}
+
+} // namespace tools
diff --git a/src/common/stack_trace.h b/src/common/stack_trace.h
new file mode 100644
index 000000000..25eec9fb3
--- /dev/null
+++ b/src/common/stack_trace.h
@@ -0,0 +1,43 @@
+// Copyright (c) 2016, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+// conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+// of conditions and the following disclaimer in the documentation and/or other
+// materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+// used to endorse or promote products derived from this software without specific
+// prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef MONERO_EXCEPTION_H
+#define MONERO_EXCEPTION_H
+
+#include <stdexcept>
+#include <string>
+
+namespace tools
+{
+
+void set_stack_trace_log(const std::string &log);
+void log_stack_trace(const char *msg);
+
+} // namespace tools
+
+#endif
diff --git a/src/daemon/main.cpp b/src/daemon/main.cpp
index 0717fd89b..8684b5d09 100644
--- a/src/daemon/main.cpp
+++ b/src/daemon/main.cpp
@@ -31,6 +31,7 @@
#include "common/command_line.h"
#include "common/scoped_message_writer.h"
#include "common/util.h"
+#include "common/stack_trace.h"
#include "cryptonote_core/cryptonote_core.h"
#include "cryptonote_core/miner.h"
#include "daemon/command_server.h"
@@ -258,6 +259,7 @@ int main(int argc, char const * argv[])
, log_file_path.filename().string().c_str()
, log_file_path.parent_path().string().c_str()
);
+ tools::set_stack_trace_log(log_file_path.filename().string());
}
_note_c("dbg/main", "Moving from main() into the daemonize now.");