1 files changed, 32 insertions, 0 deletions
diff --git a/unix/peerinfo.c b/unix/peerinfo.c
new file mode 100644
index 00000000..11f03291
--- /dev/null
+++ b/unix/peerinfo.c
@@ -0,0 +1,32 @@
+/*
+ * Unix: wrapper for getsockopt(SO_PEERCRED), conditionalised on
+ * appropriate autoconfery.
+ */
+
+#if HAVE_CMAKE_H
+#include "cmake.h"
+#endif
+
+#if HAVE_SO_PEERCRED
+#define _GNU_SOURCE
+#include <features.h>
+#endif
+
+#include <sys/socket.h>
+
+#include "putty.h"
+
+bool so_peercred(int fd, int *pid, int *uid, int *gid)
+{
+#if HAVE_SO_PEERCRED
+    struct ucred cr;
+    socklen_t crlen = sizeof(cr);
+    if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &crlen) == 0) {
+        *pid = cr.pid;
+        *uid = cr.uid;
+        *gid = cr.gid;
+        return true;
+    }
+#endif
+    return false;
+}