1 files changed, 86 insertions, 2 deletions

diff --git a/usr/src/cmd/cmd-inet/lib/ipmgmtd/ipmgmt_util.c b/usr/src/cmd/cmd-inet/lib/ipmgmtd/ipmgmt_util.c
index 8ef9a09e3d..704dab2d36 100644
--- a/usr/src/cmd/cmd-inet/lib/ipmgmtd/ipmgmt_util.c
+++ b/usr/src/cmd/cmd-inet/lib/ipmgmtd/ipmgmt_util.c
@@ -20,8 +20,7 @@
  */
 
 /*
- * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  */
 
 /*
@@ -33,8 +32,12 @@
 #include <stdio.h>
 #include <syslog.h>
 #include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
 #include "ipmgmt_impl.h"
 
+#define	IPMGMT_BUFSIZ	1024
+
 void
 ipmgmt_log(int pri, const char *fmt, ...)
 {
@@ -44,3 +47,84 @@ ipmgmt_log(int pri, const char *fmt, ...)
 	vsyslog(pri, fmt, alist);
 	va_end(alist);
 }
+
+/*
+ * Copy a source file to a new destination. The source file will be
+ * removed if rdonly is false (i.e., used when the source file resides
+ * on a read-only file system).
+ *
+ * Returns 0 on success and errno on failure.
+ */
+int
+ipmgmt_cpfile(const char *src, const char *dst, boolean_t rdonly)
+{
+	struct stat statbuf;
+	FILE *sfp, *dfp;
+	char buf[IPMGMT_BUFSIZ];
+	size_t bytes;
+	int err = 0;
+
+	/*
+	 * Attempt to open the destination file first since we
+	 * want to optimize for the case where it is read-only
+	 * and will return EROFS.
+	 */
+	if ((dfp = fopen(dst, "w+")) == NULL)
+		return (errno);
+
+	/*
+	 * Require that the source file exists.
+	 */
+	if (stat(src, &statbuf) != 0) {
+		err = errno;
+		(void) fclose(dfp);
+		return (err);
+	}
+	if ((sfp = fopen(src, "r")) == NULL) {
+		err = errno;
+		(void) fclose(dfp);
+		return (err);
+	}
+
+	/*
+	 * Copy the file.
+	 */
+	while (((bytes = fread(buf, 1, sizeof (buf), sfp)) != 0) &&
+	    (errno == 0)) {
+		(void) fwrite(buf, bytes, 1, dfp);
+		if (errno != 0)
+			break;
+	}
+	if (errno != 0)
+		err = errno;
+
+	(void) fclose(sfp);
+	(void) fclose(dfp);
+
+	/*
+	 * If any error occurred, then remove the destination file.
+	 */
+	if (err != 0) {
+		(void) unlink(dst);
+		return (err);
+	}
+
+	/*
+	 * Make sure the file attributes are correct.
+	 */
+	if (chmod(dst, IPADM_FILE_MODE) != 0 ||
+	    chown(dst, UID_NETADM, GID_NETADM) != 0) {
+		err = errno;
+		(void) unlink(dst);
+		return (err);
+	}
+
+	/*
+	 * If the source file does not reside on a read-only file system
+	 * then remove it.
+	 */
+	if (!rdonly)
+		(void) unlink(src);
+
+	return (0);
+}