LM: new module

src/detection/lm/lm_linux.c

@@ -0,0 +1,23 @@
+#include "lm.h"
+#include "common/properties.h"
+
+#define FF_SYSTEMD_SESSIONS_PATH "/var/run/systemd/sessions/"
+
+const char* ffDetectLM(FFLMResult* result)
+{
+    const char* sessionId = getenv("XDG_SESSION_ID");
+    if (!sessionId) return "$XDG_SESSION_ID is not set";
+
+    char path[64] = FF_SYSTEMD_SESSIONS_PATH;
+    strncpy(path + strlen(FF_SYSTEMD_SESSIONS_PATH), sessionId, sizeof(path) - strlen(FF_SYSTEMD_SESSIONS_PATH) - 1);
+
+    // The file reads `This is private data. Do not parse`.
+    // What does it mean? But let's ignore it for now.
+    if (!ffParsePropFileValues(path, 2, (FFpropquery[]) {
+        {"SERVICE=", &result->service},
+        {"TYPE=", &result->type},
+    }))
+        return "Failed to parse /run/systemd/sessions/$XDG_SESSION_ID";
+
+    return NULL;
+}