[BUILD] rewrite CMake build system to track changes of source files

This change restructures the source code directories, separates shared
form non-shared application code and adds CMake dependencies. These
dependencies allow the tracking of changes and trigger a rebuild of
those build targets where changed files are involved.

WARNING: Note that the support of the DNBD3_SERVER_AFL build option is
not supported yet. Thus, the option should be never turned on.

2 files changed, 98 insertions, 0 deletions

diff --git a/inc/dnbd3/config/client.h b/inc/dnbd3/config/client.h
new file mode 100644
index 0000000..f35f673
--- /dev/null
+++ b/inc/dnbd3/config/client.h
@@ -0,0 +1,36 @@
+#ifndef _CLIENTCONFIG_H_
+#define _CLIENTCONFIG_H_
+
+// Which is the minimum protocol version the client expects from the server
+#define MIN_SUPPORTED_SERVER 2
+
+// in seconds if not stated otherwise (MS = milliseconds)
+#define SOCKET_TIMEOUT_CLIENT_DATA 2
+#define SOCKET_TIMEOUT_CLIENT_DISCOVERY 1
+
+#define RTT_THRESHOLD_FACTOR(us) (((us) * 2) / 3) // 2/3 = current to best must be 33% worse
+#define RTT_ABSOLUTE_THRESHOLD (80000) // Or 80ms worse
+#define RTT_UNREACHABLE 0x7FFFFFFul // Use this value for timeout/unreachable as RTT. Don't set too high or you might get overflows. 0x7FFFFFF = 134 seconds
+// This must be a power of two:
+#define RTT_BLOCK_SIZE 4096
+
+#define STARTUP_MODE_DURATION 30
+// Interval of several repeating tasks (in seconds)
+#define TIMER_INTERVAL_PROBE_STARTUP 4
+#define TIMER_INTERVAL_PROBE_NORMAL 22
+#define TIMER_INTERVAL_PROBE_PANIC 2
+#define TIMER_INTERVAL_KEEPALIVE_PACKET 6
+
+// Expect a keepalive response every X seconds
+#define SOCKET_KEEPALIVE_TIMEOUT 8
+
+// Number of unsuccessful alt_server probes before read errors are reported to the block layer
+// (ALL servers will be probed this many times)
+// Set to 0 to disable
+#define PROBE_COUNT_TIMEOUT 0
+
+// ++ Kernel module ++
+#define DEFAULT_READ_AHEAD_KB 512
+#define NUMBER_DEVICES 8
+
+#endif
diff --git a/inc/dnbd3/config/server.h b/inc/dnbd3/config/server.h
new file mode 100644
index 0000000..b6eee2c
--- /dev/null
+++ b/inc/dnbd3/config/server.h
@@ -0,0 +1,62 @@
+#ifndef _SERVERCONFIG_H_
+#define _SERVERCONFIG_H_
+
+#include <dnbd3/config.h>
+
+// +++++ Performance/memory related
+#define SERVER_MAX_CLIENTS 4000
+#define SERVER_MAX_IMAGES  5000
+#define SERVER_MAX_ALTS    50
+// +++++ Uplink handling (proxy mode)
+#define SERVER_GLOBAL_DUP_TIME 6 // How many seconds to wait before changing global fail counter again
+#define SERVER_BAD_UPLINK_MIN 10 // Thresold for fails at which we start ignoring the server occasionally
+#define SERVER_BAD_UPLINK_MAX 20 // Hard block server if it failed this many times
+#define SERVER_BAD_UPLINK_LOCAL_BLOCK 10 // If a server didn't supply the requested image this many times, block it for some time
+#define SERVER_BAD_UPLINK_IGNORE 180 // How many seconds is a server ignored
+#define UPLINK_MAX_QUEUE  500 // Maximum number of queued requests per uplink
+#define UPLINK_MAX_CLIENTS_PER_REQUEST 32 // Maximum number of clients that can attach to one uplink request
+#define SERVER_UPLINK_QUEUELEN_THRES  900 // Threshold where we start dropping incoming clients
+#define SERVER_MAX_PENDING_ALT_CHECKS 500 // Length of queue for pending alt checks requested by uplinks
+
+// Wait a maximum of 5 minutes before saving cache map (if data was received at all)
+#define CACHE_MAP_MAX_SAVE_DELAY 300
+// If more than 500MB have been received from uplink without saving cache map, do so
+#define CACHE_MAP_MAX_UNSAVED_BYTES ((uint64_t)500 * 1000 * 1000)
+
+// Time in ms to wait for a read/write call to complete on an uplink connection
+#define SOCKET_TIMEOUT_UPLINK 5000
+// Same for client connections. Be a bit more liberal here
+#define SOCKET_TIMEOUT_CLIENT 15000
+// When waiting for the next request header from client, allow the timeout from above
+// to expire this many times. This allows for greater idle times without also increasing
+// the timeout for cases where we wait for additional data or are actively sending a reply
+#define SOCKET_TIMEOUT_CLIENT_RETRIES 3
+
+#define SERVER_UPLINK_KEEPALIVE_INTERVAL 10 // (Seconds) Send keep-alive if nothing else is happening on the uplink
+#define SERVER_UPLINK_IDLE_TIMEOUT 1800 // (Seconds) Timeout after which we tear down an uplink connection if no blocks needed to be fetched
+
+// +++++ Other magic constants
+#define SERVER_RTT_PROBES 5 // How many probes to average over
+#define SERVER_RTT_INTERVAL_INIT 5 // Initial interval between probes
+#define SERVER_RTT_INTERVAL_MAX 45 // Maximum interval between probes
+#define SERVER_RTT_MAX_UNREACH 10 // If no server was reachable this many times, stop RTT measurements for a while
+#define SERVER_RTT_INTERVAL_FAILED 180 // Interval to use if no uplink server is reachable for above many times
+
+#define SERVER_REMOTE_IMAGE_CHECK_CACHETIME 120 // 2 minutes
+
+// Which is the minimum protocol version the server expects from the client
+#define MIN_SUPPORTED_CLIENT 2
+// Same for when we're a proxy talking to another server
+#define MIN_SUPPORTED_SERVER 2
+
+// Length of comment fields (for alt server etc.)
+#define COMMENT_LENGTH 120
+
+#define RTT_THRESHOLD_FACTOR(us) (((us) * 2) / 3) // 2/3 = current to best must be 33% worse
+#define RTT_UNREACHABLE 0x7FFFFFFu // Use this value for timeout/unreachable as RTT. Don't set too high or you might get overflows. 0x7FFFFFF = 134 seconds
+
+// How many seconds have to pass after the last client disconnected until the imagefd is closed
+#define UNUSED_FD_TIMEOUT 3600
+
+#endif
+