Add batch mode to mosquitto_passwd.

ChangeLog.txt

@@ -33,6 +33,8 @@ Broker:
   v3.1.1 client connects with a zero length client id.
 - Anonymous clients are no longer accidently disconnected from the broker
   after a SIGHUP.
+- mosquitto_passwd now supports -b (batch mode) to allow the password to be
+  provided at the command line.
 
 Clients:
 - Both clients can now load default configuration options from a file.

man/mosquitto_passwd.1.xml

@@ -24,6 +24,13 @@
 			<arg choice='plain'><replaceable>passwordfile</replaceable></arg>
 			<arg choice='plain'><replaceable>username</replaceable></arg>
 		</cmdsynopsis>
+		<cmdsynopsis>
+			<command>mosquitto_passwd</command>
+			<arg choice='plain'><option>-b</option></arg>
+			<arg choice='plain'><replaceable>passwordfile</replaceable></arg>
+			<arg choice='plain'><replaceable>username</replaceable></arg>
+			<arg choice='plain'><replaceable>password</replaceable></arg>
+		</cmdsynopsis>
 		<cmdsynopsis>
 			<command>mosquitto_passwd</command>
 			<arg choice='plain'><option>-U</option></arg>
@@ -43,6 +50,16 @@
 	<refsect1>
 		<title>Options</title>
 		<variablelist>
+			<varlistentry>
+				<term><option>-b</option></term>
+				<listitem>
+					<para>Run in batch mode. This allows the password to be
+						provided at the command line which can be convenient
+						but should be used with care because the password will
+						be visible on the command line and in command
+						history.</para>
+				</listitem>
+			</varlistentry>
 			<varlistentry>
 				<term><option>-c</option></term>
 				<listitem>
@@ -82,6 +99,12 @@
 					<para>The username to add/update/delete.</para>
 				</listitem>
 			</varlistentry>
+			<varlistentry>
+				<term><option>password</option></term>
+				<listitem>
+					<para>The password to use when in batch mode.</para>
+				</listitem>
+			</varlistentry>
 		</variablelist>
 	</refsect1>
 

src/mosquitto_passwd.c

@@ -73,7 +73,9 @@ void print_usage(void)
 {
 	printf("mosquitto_passwd is a tool for managing password files for mosquitto.\n\n");
 	printf("Usage: mosquitto_passwd [-c | -D] passwordfile username\n");
+	printf("       mosquitto_passwd -b passwordfile username password\n");
 	printf("       mosquitto_passwd -U passwordfile\n");
+	printf(" -b : run in batch mode to allow passing passwords on the command line.\n");
 	printf(" -c : create a new password file. This will overwrite existing files.\n");
 	printf(" -D : delete the username rather than adding/updating its password.\n");
 	printf(" -U : update a plain text password file to use hashed passwords.\n");
@@ -346,6 +348,8 @@ int main(int argc, char *argv[])
 {
 	char *password_file = NULL;
 	char *username = NULL;
+	char *password_cmd = NULL;
+	bool batch_mode = false;
 	bool create_new = false;
 	bool delete_user = false;
 	FILE *fptr, *ftmp;
@@ -359,11 +363,23 @@ int main(int argc, char *argv[])
 
 	OpenSSL_add_all_digests();
 
-	if(argc == 4){
+	if(argc == 5){
+		if(!strcmp(argv[1], "-b")){
+			batch_mode = true;
+		}else{
+			fprintf(stderr, "Error: Unknown option '%s'\n", argv[1]);
+		}
+		password_file = argv[2];
+		username = argv[3];
+		password_cmd = argv[4];
+	}else if(argc == 4){
 		if(!strcmp(argv[1], "-c")){
 			create_new = true;
 		}else if(!strcmp(argv[1], "-D")){
 			delete_user = true;
+		}else{
+			fprintf(stderr, "Error: Unknown option '%s'\n", argv[1]);
+			return 1;
 		}
 		password_file = argv[2];
 		username = argv[3];
@@ -419,16 +435,21 @@ int main(int argc, char *argv[])
 		}else if(do_update_file){
 			rc = update_file(fptr, ftmp);
 		}else{
-			rc = get_password(password, 1024);
-			if(rc){
-				fclose(fptr);
-				fclose(ftmp);
-				unlink(backup_file);
-				free(backup_file);
-				return rc;
+			if(batch_mode){
+				/* Update password for individual user */
+				rc = update_pwuser(fptr, ftmp, username, password_cmd);
+			}else{
+				rc = get_password(password, 1024);
+				if(rc){
+					fclose(fptr);
+					fclose(ftmp);
+					unlink(backup_file);
+					free(backup_file);
+					return rc;
+				}
+				/* Update password for individual user */
+				rc = update_pwuser(fptr, ftmp, username, password);
 			}
-			/* Update password for individual user */
-			rc = update_pwuser(fptr, ftmp, username, password);
 		}
 		if(rc){
 			fclose(fptr);