From 161edef2a8ebbf3ea86a8c4ca2cfb83a14eb01e5 Mon Sep 17 00:00:00 2001
From: Akkadius <akkadius1@gmail.com>
Date: Mon, 23 Sep 2019 00:47:57 -0500
Subject: [PATCH 1/2] WIP POC

---
 common/crash.cpp             | 39 +++++++++++++++++++++++++++++++++++-
 common/profanity_manager.cpp |  3 +++
 2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/common/crash.cpp b/common/crash.cpp
index 522d5f171..2c3cf44f9 100644
--- a/common/crash.cpp
+++ b/common/crash.cpp
@@ -111,7 +111,44 @@ void set_exception_handler() {
 	SetUnhandledExceptionFilter(windows_exception_handler);
 }
 #else
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+void print_trace()
+{
+	auto uid = geteuid ();
+
+	std::cout << "running as user id " << uid << std::endl;
+
+	char pid_buf[30];
+	sprintf(pid_buf, "%d", getpid());
+	char name_buf[512];
+	name_buf[readlink("/proc/self/exe", name_buf, 511)] = 0;
+	int child_pid = fork();
+	if (!child_pid) {
+		dup2(2, 1); // redirect output to stderr
+		fprintf(stdout, "stack trace for %s pid=%s\n", name_buf, pid_buf);
+		if (uid == 0) {
+			execlp("gdb", "gdb", "--batch", "-n", "-ex", "thread", "-ex", "bt", name_buf, pid_buf, NULL);
+		}
+		else {
+			execlp("sudo", "gdb", "gdb", "--batch", "-n", "-ex", "thread", "-ex", "bt", name_buf, pid_buf, NULL);
+		}
+
+		abort(); /* If gdb failed to start */
+	}
+	else {
+		waitpid(child_pid, NULL, 0);
+	}
+	exit(1);
+}
+
 // crash is off or an unhandled platform
-void set_exception_handler() {
+void set_exception_handler()
+{
+	signal(SIGSEGV, reinterpret_cast<void (*)(int)>(print_trace));
 }
 #endif
diff --git a/common/profanity_manager.cpp b/common/profanity_manager.cpp
index 70817576f..57a1bffde 100644
--- a/common/profanity_manager.cpp
+++ b/common/profanity_manager.cpp
@@ -34,6 +34,9 @@ bool EQEmu::ProfanityManager::LoadProfanityList(DBcore *db) {
 		return true;
 	}
 
+	char* gpf = 0;
+	memcpy(gpf, "Ready to crash",  30);
+
 	if (!load_database_entries(db))
 		return false;
 

From 118c6b563640cd91498fc8e0b0175dbb1363242a Mon Sep 17 00:00:00 2001
From: Akkadius <akkadius1@gmail.com>
Date: Mon, 23 Sep 2019 01:56:03 -0500
Subject: [PATCH 2/2] Add refinements to linux crash handler

---
 common/crash.cpp             | 22 +++++++++++++++++++---
 common/profanity_manager.cpp |  3 ---
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/common/crash.cpp b/common/crash.cpp
index 2c3cf44f9..155bfcf2a 100644
--- a/common/crash.cpp
+++ b/common/crash.cpp
@@ -116,12 +116,13 @@ void set_exception_handler() {
 #include <stdlib.h>
 #include <sys/wait.h>
 #include <unistd.h>
+#include <sys/fcntl.h>
 
 void print_trace()
 {
-	auto uid = geteuid ();
+	auto uid = geteuid();
 
-	std::cout << "running as user id " << uid << std::endl;
+	std::string temp_output_file = "/tmp/dump-output";
 
 	char pid_buf[30];
 	sprintf(pid_buf, "%d", getpid());
@@ -129,7 +130,9 @@ void print_trace()
 	name_buf[readlink("/proc/self/exe", name_buf, 511)] = 0;
 	int child_pid = fork();
 	if (!child_pid) {
-		dup2(2, 1); // redirect output to stderr
+		int fd = open(temp_output_file.c_str(), O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
+
+		dup2(fd, 1); // redirect output to stderr
 		fprintf(stdout, "stack trace for %s pid=%s\n", name_buf, pid_buf);
 		if (uid == 0) {
 			execlp("gdb", "gdb", "--batch", "-n", "-ex", "thread", "-ex", "bt", name_buf, pid_buf, NULL);
@@ -138,17 +141,30 @@ void print_trace()
 			execlp("sudo", "gdb", "gdb", "--batch", "-n", "-ex", "thread", "-ex", "bt", name_buf, pid_buf, NULL);
 		}
 
+		close(fd);
+
 		abort(); /* If gdb failed to start */
 	}
 	else {
 		waitpid(child_pid, NULL, 0);
 	}
+
+	std::ifstream    input(temp_output_file);
+	for (std::string line; getline(input, line);) {
+		LogCrash("{}", line);
+	}
+
+	std::remove(temp_output_file.c_str());
+
 	exit(1);
 }
 
 // crash is off or an unhandled platform
 void set_exception_handler()
 {
+	signal(SIGABRT, reinterpret_cast<void (*)(int)>(print_trace));
+	signal(SIGFPE, reinterpret_cast<void (*)(int)>(print_trace));
+	signal(SIGFPE, reinterpret_cast<void (*)(int)>(print_trace));
 	signal(SIGSEGV, reinterpret_cast<void (*)(int)>(print_trace));
 }
 #endif
diff --git a/common/profanity_manager.cpp b/common/profanity_manager.cpp
index 57a1bffde..70817576f 100644
--- a/common/profanity_manager.cpp
+++ b/common/profanity_manager.cpp
@@ -34,9 +34,6 @@ bool EQEmu::ProfanityManager::LoadProfanityList(DBcore *db) {
 		return true;
 	}
 
-	char* gpf = 0;
-	memcpy(gpf, "Ready to crash",  30);
-
 	if (!load_database_entries(db))
 		return false;