1 files changed, 100 insertions, 0 deletions
diff --git a/src/daemon/privsep_io.c b/src/daemon/privsep_io.c
new file mode 100644
index 0000000..9d0923a
--- /dev/null
+++ b/src/daemon/privsep_io.c
@@ -0,0 +1,100 @@
+/* -*- mode: c; c-file-style: "openbsd" -*- */
+
+#include "lldpd.h"
+
+#include <sys/param.h>
+#include <sys/uio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/* Stolen from sbin/pflogd/privsep.c from OpenBSD */
+/*
+ * Copyright (c) 2003 Can Erkin Acar
+ * Copyright (c) 2003 Anil Madhavapeddy <anil@recoil.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* Read all data or return 1 for error.  */
+int
+may_read(enum priv_context ctx, void *buf, size_t n)
+{
+	char *s = buf;
+	ssize_t res, pos = 0;
+
+	while (n > pos) {
+		res = read(priv_fd(ctx), s + pos, n - pos);
+		switch (res) {
+		case -1:
+			if (errno == EINTR || errno == EAGAIN) continue;
+			return 1;
+		case 0:
+			return 1;
+		default:
+			pos += res;
+		}
+	}
+	return (0);
+}
+
+/* Read data with the assertion that it all must come through, or
+ * else abort the process.  Based on atomicio() from openssh. */
+void
+must_read(enum priv_context ctx, void *buf, size_t n)
+{
+	char *s = buf;
+	ssize_t res, pos = 0;
+
+	while (n > pos) {
+		res = read(priv_fd(ctx), s + pos, n - pos);
+		switch (res) {
+		case -1:
+			if (errno == EINTR || errno == EAGAIN) continue;
+			_exit(0);
+		case 0:
+			_exit(0);
+		default:
+			pos += res;
+		}
+	}
+}
+
+/* Write data with the assertion that it all has to be written, or
+ * else abort the process.  Based on atomicio() from openssh. */
+void
+must_write(enum priv_context ctx, const void *buf, size_t n)
+{
+	const char *s = buf;
+	ssize_t res, pos = 0;
+
+	while (n > pos) {
+		res = write(priv_fd(ctx), s + pos, n - pos);
+		switch (res) {
+		case -1:
+			if (errno == EINTR || errno == EAGAIN) continue;
+			_exit(0);
+		case 0:
+			_exit(0);
+		default:
+			pos += res;
+		}
+	}
+}