fish: '-i' option automatically handles whole-disk encryption.

[libguestfs.git] / fish / keys.c

diff --git a/fish/keys.c b/fish/keys.c
new file mode 100644 (file)
index 0000000..deb627f
--- /dev/null
+++ b/fish/keys.c
@@ -0,0 +1,91 @@
+/* libguestfs - guestfish and guestmount shared option parsing
+ * Copyright (C) 2010 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <termios.h>
+
+#include "guestfs.h"
+
+#include "options.h"
+
+/* Read a passphrase ('Key') from /dev/tty with echo off.
+ * The caller (cmds.c) will call free on the string afterwards.
+ * Based on the code in cryptsetup file lib/utils.c.
+ */
+char *
+read_key (const char *param)
+{
+  FILE *infp, *outfp;
+  struct termios orig, temp;
+  char *ret = NULL;
+
+  /* Read and write to /dev/tty if available. */
+  if (keys_from_stdin ||
+      (infp = outfp = fopen ("/dev/tty", "w+")) == NULL) {
+    infp = stdin;
+    outfp = stdout;
+  }
+
+  /* Print the prompt and set no echo. */
+  int tty = isatty (fileno (infp));
+  int tcset = 0;
+  if (tty) {
+    fprintf (outfp, _("Enter key or passphrase (\"%s\"): "), param);
+
+    if (!echo_keys) {
+      if (tcgetattr (fileno (infp), &orig) == -1) {
+        perror ("tcgetattr");
+        goto error;
+      }
+      memcpy (&temp, &orig, sizeof temp);
+      temp.c_lflag &= ~ECHO;
+
+      tcsetattr (fileno (infp), TCSAFLUSH, &temp);
+      tcset = 1;
+    }
+  }
+
+  size_t n = 0;
+  ssize_t len;
+  len = getline (&ret, &n, infp);
+  if (len == -1) {
+    perror ("getline");
+    ret = NULL;
+    goto error;
+  }
+
+  /* Remove the terminating \n if there is one. */
+  if (len > 0 && ret[len-1] == '\n')
+    ret[len-1] = '\0';
+
+ error:
+  /* Restore echo, close file descriptor. */
+  if (tty && tcset) {
+    printf ("\n");
+    tcsetattr (fileno (infp), TCSAFLUSH, &orig);
+  }
+
+  if (infp != stdin)
+    fclose (infp); /* outfp == infp, so this is closed also */
+
+  return ret;
+}