1 files changed, 78 insertions, 0 deletions
diff --git a/src/pulsecore/native-common.c b/src/pulsecore/native-common.c
new file mode 100644
index 0000000..282a4ed
--- /dev/null
+++ b/src/pulsecore/native-common.c
@@ -0,0 +1,78 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2016 Ahmed S. Darwish <darwish.07@gmail.com>
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+
+  PulseAudio 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <pulsecore/core-util.h>
+#include <pulsecore/creds.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/pdispatch.h>
+#include <pulsecore/pstream.h>
+#include <pulsecore/tagstruct.h>
+
+#include "native-common.h"
+
+/*
+ * Command handlers shared between client and server
+ */
+
+/* Check pa_pstream_register_memfd_mempool() for further details */
+int pa_common_command_register_memfd_shmid(pa_pstream *p, pa_pdispatch *pd, uint32_t version,
+                                           uint32_t command, pa_tagstruct *t) {
+#if defined(HAVE_CREDS) && defined(HAVE_MEMFD)
+    pa_cmsg_ancil_data *ancil = NULL;
+    unsigned shm_id;
+    int ret = -1;
+
+    pa_assert(pd);
+    pa_assert(command == PA_COMMAND_REGISTER_MEMFD_SHMID);
+    pa_assert(t);
+
+    ancil = pa_pdispatch_take_ancil_data(pd);
+    if (!ancil)
+        goto finish;
+
+    /* Upon fd leaks and reaching our open fd limit, recvmsg(2)
+     * just strips all passed fds from the ancillary data */
+    if (ancil->nfd == 0) {
+        pa_log("Expected 1 memfd fd to be received over pipe; got 0");
+        pa_log("Did we reach our open file descriptors limit?");
+        goto finish;
+    }
+
+    if (ancil->nfd != 1 || ancil->fds[0] == -1)
+        goto finish;
+
+    if (version < 31 || pa_tagstruct_getu32(t, &shm_id) < 0 || !pa_tagstruct_eof(t))
+        goto finish;
+
+    pa_pstream_attach_memfd_shmid(p, shm_id, ancil->fds[0]);
+
+    ret = 0;
+finish:
+    if (ancil)
+        pa_cmsg_ancil_data_close_fds(ancil);
+
+    return ret;
+#else
+    return -1;
+#endif
+}