From 5102d7411f0115f35558c2d836e26303eb2d205b Mon Sep 17 00:00:00 2001
From: Abhiram V <abhi.raa.man.v@gmail.com>
Date: Mon, 21 Nov 2022 22:00:27 +0530
Subject: [PATCH] wpa_passphrase: Disable terminal echo when reading from stdin

Disable terminal echo using tcgetattr() and tcsetattr() when reading a
passphrase from stdin.

Signed-off-by: Abhiram V <abhi.raa.man.v@gmail.com>
---
 wpa_supplicant/wpa_passphrase.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/wpa_supplicant/wpa_passphrase.c b/wpa_supplicant/wpa_passphrase.c
index d9c07e673..cfab4f1b5 100644
--- a/wpa_supplicant/wpa_passphrase.c
+++ b/wpa_supplicant/wpa_passphrase.c
@@ -7,6 +7,7 @@
  */
 
 #include "includes.h"
+#include <termios.h>
 
 #include "common.h"
 #include "crypto/sha1.h"
@@ -14,6 +15,7 @@
 
 int main(int argc, char *argv[])
 {
+	struct termios term;
 	unsigned char psk[32];
 	int i;
 	char *ssid, *passphrase, buf[64], *pos;
@@ -31,11 +33,28 @@ int main(int argc, char *argv[])
 	if (argc > 2) {
 		passphrase = argv[2];
 	} else {
+		bool ctrl_echo;
+
 		fprintf(stderr, "# reading passphrase from stdin\n");
+		if (tcgetattr(STDIN_FILENO, &term) < 0) {
+			perror("tcgetattr");
+			return 1;
+		}
+		ctrl_echo = term.c_lflag & ECHO;
+		term.c_lflag &= ~ECHO;
+		if (ctrl_echo && tcsetattr(STDIN_FILENO, TCSANOW, &term) < 0) {
+			perror("tcsetattr:error disabling echo");
+			return 1;
+		}
 		if (fgets(buf, sizeof(buf), stdin) == NULL) {
 			fprintf(stderr, "Failed to read passphrase\n");
 			return 1;
 		}
+		term.c_lflag |= ECHO;
+		if (ctrl_echo && tcsetattr(STDIN_FILENO, TCSANOW, &term) < 0) {
+			perror("tcsetattr:error enabling echo");
+			return 1;
+		}
 		buf[sizeof(buf) - 1] = '\0';
 		pos = buf;
 		while (*pos != '\0') {