generator: Add 'Key' parameter type.

[libguestfs.git] / fish / fish.c

diff --git a/fish/fish.c b/fish/fish.c
index 4276ae1..68f26ed 100644 (file)
--- a/fish/fish.c
+++ b/fish/fish.c
@@ -29,6 +29,7 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <locale.h>
+#include <termios.h>
 
 #ifdef HAVE_LIBREADLINE
 #include <readline/readline.h>
@@ -80,6 +81,7 @@ int remote_control_listen = 0;
 int remote_control = 0;
 int exit_on_error = 1;
 int command_num = 0;
+int keys_from_stdin = 0;
 
 static void __attribute__((noreturn))
 usage (int status)
@@ -110,6 +112,7 @@ usage (int status)
              "  -D|--no-dest-paths   Don't tab-complete paths from guest fs\n"
              "  -f|--file file       Read commands from file\n"
              "  -i|--inspector       Run virt-inspector to get disk mountpoints\n"
+             "  --keys-from-stdin    Read passphrases from stdin\n"
              "  --listen             Listen for remote commands\n"
              "  -m|--mount dev[:mnt] Mount dev on mnt (if omitted, /)\n"
              "  -n|--no-sync         Don't autosync\n"
@@ -149,6 +152,7 @@ main (int argc, char *argv[])
     { "file", 1, 0, 'f' },
     { "help", 0, 0, HELP_OPTION },
     { "inspector", 0, 0, 'i' },
+    { "keys-from-stdin", 0, 0, 0 },
     { "listen", 0, 0, 0 },
     { "mount", 1, 0, 'm' },
     { "new", 1, 0, 'N' },
@@ -239,6 +243,8 @@ main (int argc, char *argv[])
         }
       } else if (STREQ (long_options[option_index].name, "selinux")) {
         guestfs_set_selinux (g, 1);
+      } else if (STREQ (long_options[option_index].name, "keys-from-stdin")) {
+        keys_from_stdin = 1;
       } else {
         fprintf (stderr, _("%s: unknown long option: %s (%d)\n"),
                  program_name, long_options[option_index].name, option_index);
@@ -1710,6 +1716,67 @@ file_out (const char *arg)
   return ret;
 }
 
+/* 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 (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;
+}
+
 static void
 print_shell_quote (FILE *stream, const char *str)
 {