Add support for resetting the terminal modes on stderr to something sensible

[u/mdw/putty] / unix / uxcons.c

diff --git a/unix/uxcons.c b/unix/uxcons.c
index d4848a6..16e69fb 100644 (file)
--- a/unix/uxcons.c
+++ b/unix/uxcons.c
@@ -18,6 +18,31 @@ int console_batch_mode = FALSE;
 
 static void *console_logctx = NULL;
 
+static struct termios orig_termios_stderr;
+static int stderr_is_a_tty;
+
+void stderr_tty_init()
+{
+    /* Ensure that if stderr is a tty, we can get it back to a sane state. */
+    if ((flags & FLAG_STDERR_TTY) && isatty(STDERR_FILENO)) {
+       stderr_is_a_tty = TRUE;
+       tcgetattr(STDERR_FILENO, &orig_termios_stderr);
+    }
+}
+
+void premsg(struct termios *cf)
+{
+    if (stderr_is_a_tty) {
+       tcgetattr(STDERR_FILENO, cf);
+       tcsetattr(STDERR_FILENO, TCSADRAIN, &orig_termios_stderr);
+    }
+}
+void postmsg(struct termios *cf)
+{
+    if (stderr_is_a_tty)
+       tcsetattr(STDERR_FILENO, TCSADRAIN, cf);
+}
+
 /*
  * Clean up and exit.
  */
@@ -101,6 +126,7 @@ int verify_ssh_host_key(void *frontend, char *host, int port, char *keytype,
     static const char abandoned[] = "Connection abandoned.\n";
 
     char line[32];
+    struct termios cf;
 
     /*
      * Verify the key.
@@ -110,6 +136,7 @@ int verify_ssh_host_key(void *frontend, char *host, int port, char *keytype,
     if (ret == 0)                     /* success - key matched OK */
        return 1;
 
+    premsg(&cf);
     if (ret == 2) {                   /* key was different */
        if (console_batch_mode) {
            fprintf(stderr, wrongmsg_batch, keytype, fingerprint);
@@ -141,9 +168,11 @@ int verify_ssh_host_key(void *frontend, char *host, int port, char *keytype,
     if (line[0] != '\0' && line[0] != '\r' && line[0] != '\n') {
        if (line[0] == 'y' || line[0] == 'Y')
            store_host_key(host, port, keytype, keystr);
+       postmsg(&cf);
         return 1;
     } else {
        fprintf(stderr, abandoned);
+       postmsg(&cf);
         return 0;
     }
 }
@@ -166,7 +195,9 @@ int askalg(void *frontend, const char *algtype, const char *algname,
     static const char abandoned[] = "Connection abandoned.\n";
 
     char line[32];
+    struct termios cf;
 
+    premsg(&cf);
     if (console_batch_mode) {
        fprintf(stderr, msg_batch, algtype, algname);
        return 0;
@@ -187,9 +218,11 @@ int askalg(void *frontend, const char *algtype, const char *algname,
     }
 
     if (line[0] == 'y' || line[0] == 'Y') {
+       postmsg(&cf);
        return 1;
     } else {
        fprintf(stderr, abandoned);
+       postmsg(&cf);
        return 0;
     }
 }
@@ -215,7 +248,9 @@ int askappend(void *frontend, Filename filename,
        "Logging will not be enabled.\n";
 
     char line[32];
+    struct termios cf;
 
+    premsg(&cf);
     if (console_batch_mode) {
        fprintf(stderr, msgtemplate_batch, FILENAME_MAX, filename.path);
        fflush(stderr);
@@ -235,6 +270,7 @@ int askappend(void *frontend, Filename filename,
        tcsetattr(0, TCSANOW, &oldmode);
     }
 
+    postmsg(&cf);
     if (line[0] == 'y' || line[0] == 'Y')
        return 2;
     else if (line[0] == 'n' || line[0] == 'N')
@@ -266,7 +302,10 @@ void old_keyfile_warning(void)
        "Once the key is loaded into PuTTYgen, you can perform\n"
        "this conversion simply by saving it again.\n";
 
+    struct termios cf;
+    premsg(&cf);
     fputs(message, stderr);
+    postmsg(&cf);
 }
 
 void console_provide_logctx(void *logctx)
@@ -276,8 +315,11 @@ void console_provide_logctx(void *logctx)
 
 void logevent(void *frontend, const char *string)
 {
+    struct termios cf;
+    premsg(&cf);
     if (console_logctx)
        log_eventlog(console_logctx, string);
+    postmsg(&cf);
 }
 
 static void console_data_untrusted(const char *data, int len)