Added detached thread handling code

Make it easier to create a detached thread, it's always the same and
error-checking is quite repetitive.

Makefile

@@ -11,7 +11,7 @@ PYPGMOPTS := ../Python/pypgmopts/pypgmopts
 
 LDFLAGS := `pkg-config --libs openssl`
 
-OBJS := luksrku.o editor.o util.o log.o keydb.o file_encryption.o uuid.o argparse_edit.o pgmopts.o openssl.o server.o argparse_server.o
+OBJS := luksrku.o editor.o util.o log.o keydb.o file_encryption.o uuid.o argparse_edit.o pgmopts.o openssl.o server.o argparse_server.o thread.o
 
 parsers:
 	$(PYPGMOPTS) -n edit parsers/parser_edit.py

server.c

@@ -43,6 +43,7 @@
 #include "luks.h"
 #include "pgmopts.h"
 #include "uuid.h"
+#include "thread.h"
 
 static int create_tcp_server_socket(int port) {
 	int s;
@@ -376,7 +377,7 @@ static int psk_server_callback(SSL *ssl, const unsigned char *identity, size_t i
 	return 1;
 }
 
-static void *client_handler_thread(void *vctx) {
+static void client_handler_thread(void *vctx) {
 	struct client_ctx_t *client = (struct client_ctx_t*)vctx;
 
 	SSL *ssl = SSL_new(client->gctx->ctx);
@@ -410,8 +411,6 @@ static void *client_handler_thread(void *vctx) {
 	SSL_free(ssl);
 	shutdown(client->fd, SHUT_RDWR);
 	close(client->fd);
-	free(client);
-	return NULL;
 }
 
 bool keyserver_start(const struct pgmopts_server_t *opts) {
@@ -455,41 +454,17 @@ bool keyserver_start(const struct pgmopts_server_t *opts) {
 		}
 
 		/* Client has connected, fire up client thread. */
-		struct client_ctx_t *client_ctx = calloc(1, sizeof(struct client_ctx_t));
-		if (!client_ctx) {
-			log_libc(LLVL_FATAL, "Unable to malloc(3) client ctx");
-			close(tcp_sock);
-			free_generic_tls_context(&gctx);
-			return false;
-		}
-		client_ctx->gctx = &gctx;
-		client_ctx->keydb = keydb;
-		client_ctx->fd = client;
-
-		pthread_t thread;
-		pthread_attr_t attrs;
-		if (pthread_attr_init(&attrs)) {
+		struct client_ctx_t client_ctx = {
+			.gctx = &gctx,
+			.keydb = keydb,
+			.fd = client,
+		};
+		if (!pthread_create_detached_thread(client_handler_thread, &client_ctx, sizeof(client_ctx))) {
 			log_libc(LLVL_FATAL, "Unable to pthread_attr_init(3)");
 			close(tcp_sock);
 			free_generic_tls_context(&gctx);
 			return false;
 		}
-		if (pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED)) {
-			log_libc(LLVL_FATAL, "Unable to pthread_attr_setdetachstate(3)");
-			close(tcp_sock);
-			free_generic_tls_context(&gctx);
-			return false;
-		}
-		if (pthread_create(&thread, &attrs, client_handler_thread, client_ctx)) {
-			log_libc(LLVL_FATAL, "Unable to pthread_create(3) a client thread");
-			close(tcp_sock);
-			free_generic_tls_context(&gctx);
-			return false;
-
-		}
-
-
-
 	}
 
 	free_generic_tls_context(&gctx);

thread.c

@@ -0,0 +1,75 @@
+/*
+	luksrku - Tool to remotely unlock LUKS disks using TLS.
+	Copyright (C) 2016-2016 Johannes Bauer
+
+	This file is part of luksrku.
+
+	luksrku is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; this program is ONLY licensed under
+	version 3 of the License, later versions are explicitly excluded.
+
+	luksrku is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with luksrku; if not, write to the Free Software
+	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+	Johannes Bauer <JohannesBauer@gmx.de>
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <pthread.h>
+
+#include "thread.h"
+#include "log.h"
+
+struct pthread_trampoline_data_t {
+	void (*thread_function)(void *ctx);
+	uint8_t ctx[];
+};
+
+static void* pthread_trampoline(void *vctx) {
+	struct pthread_trampoline_data_t *tdata = (struct pthread_trampoline_data_t*)vctx;
+	tdata->thread_function(tdata->ctx);
+	free(tdata);
+	return NULL;
+}
+
+bool pthread_create_detached_thread(void (*thread_function)(void *ctx), const void *ctx, unsigned int ctx_length) {
+	struct pthread_trampoline_data_t *tdata = calloc(1, sizeof(struct pthread_trampoline_data_t) + ctx_length);
+	if (!tdata) {
+		log_libc(LLVL_FATAL, "Failed to allocate trampoline data using calloc(3)");
+		return false;
+	}
+	tdata->thread_function = thread_function;
+	memcpy(tdata->ctx, ctx, ctx_length);
+
+	pthread_attr_t attrs;
+	if (pthread_attr_init(&attrs)) {
+		log_libc(LLVL_FATAL, "Unable to pthread_attr_init(3)");
+		free(tdata);
+		return false;
+	}
+
+	if (pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED)) {
+		log_libc(LLVL_FATAL, "Unable to pthread_attr_setdetachstate(3)");
+		free(tdata);
+		return false;
+	}
+
+	pthread_t thread;
+	if (pthread_create(&thread, &attrs, pthread_trampoline, tdata)) {
+		log_libc(LLVL_FATAL, "Unable to pthread_create(3) a client thread");
+		free(tdata);
+		return false;
+	}
+	return true;
+}

thread.h

@@ -0,0 +1,33 @@
+/*
+	luksrku - Tool to remotely unlock LUKS disks using TLS.
+	Copyright (C) 2016-2016 Johannes Bauer
+
+	This file is part of luksrku.
+
+	luksrku is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; this program is ONLY licensed under
+	version 3 of the License, later versions are explicitly excluded.
+
+	luksrku is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with luksrku; if not, write to the Free Software
+	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+	Johannes Bauer <JohannesBauer@gmx.de>
+*/
+
+#ifndef __THREAD_H__
+#define __THREAD_H__
+
+#include <stdbool.h>
+
+/*************** AUTO GENERATED SECTION FOLLOWS ***************/
+bool pthread_create_detached_thread(void (*thread_function)(void *ctx), const void *ctx, unsigned int ctx_length);
+/***************  AUTO GENERATED SECTION ENDS   ***************/
+
+#endif