module-tunnel: automatically find the PulseAudio server

Make the PulseAudio tunnel behave the same way as a client
when it comes to figuring out how to connect to the current
PulseAudio daemon. This can be useful if you start a second
PulseAudio instance for e.g. network access.

src/pulsecore/auth-cookie.c

@@ -77,6 +77,39 @@ pa_auth_cookie* pa_auth_cookie_get(pa_core *core, const char *cn, bool create, s
     return c;
 }
 
+pa_auth_cookie *pa_auth_cookie_create(pa_core *core, const void *data, size_t size) {
+    pa_auth_cookie *c;
+    char *t;
+
+    pa_assert(core);
+    pa_assert(data);
+    pa_assert(size > 0);
+
+    t = pa_xstrdup("auth-cookie");
+
+    if ((c = pa_shared_get(core, t))) {
+
+        pa_xfree(t);
+
+        if (c->size != size)
+            return NULL;
+
+        return pa_auth_cookie_ref(c);
+    }
+
+    c = pa_xmalloc(PA_ALIGN(sizeof(pa_auth_cookie)) + size);
+    PA_REFCNT_INIT(c);
+    c->core = core;
+    c->name = t;
+    c->size = size;
+
+    pa_assert_se(pa_shared_set(core, t, c) >= 0);
+
+    memcpy((uint8_t *) c + PA_ALIGN(sizeof(pa_auth_cookie)), data, size);
+
+    return c;
+}
+
 pa_auth_cookie* pa_auth_cookie_ref(pa_auth_cookie *c) {
     pa_assert(c);
     pa_assert(PA_REFCNT_VALUE(c) >= 1);

src/pulsecore/auth-cookie.h

@@ -27,6 +27,7 @@
 typedef struct pa_auth_cookie pa_auth_cookie;
 
 pa_auth_cookie* pa_auth_cookie_get(pa_core *c, const char *cn, bool create, size_t size);
+pa_auth_cookie* pa_auth_cookie_create(pa_core *c, const void *data, size_t size);
 pa_auth_cookie* pa_auth_cookie_ref(pa_auth_cookie *c);
 void pa_auth_cookie_unref(pa_auth_cookie *c);