Exit with appropriate return code if password is not provided, fixes #87

- Remove "ginstall" as "install" replacement on macOS
- Remove "-D" flag from "install" parameters

.travis.yml

@@ -1,20 +0,0 @@
-language: c
-sudo: false
-dist: trusty
-cache:
-  ccache: true
-compiler:
-- gcc
-- clang
-env:
-  global:
-  - EXTRAFLAGS='-v'
-  - PREFIX="${HOME}"
-install:
-- 'true'
-script:
-- make
-- ./mcrcon -h
-- ./mcrcon -v
-- make install
-- make uninstall

CHANGELOG.md

@@ -1,5 +1,17 @@
 #### Version history:
 
+###### 0.7.3
+ - Add support to Valve style rcon authentication
+ 
+###### 0.7.2
+ - Quit gracefully when Ctrl-D or Ctrl+C is pressed
+ - Remove "exit" and "quit" as quitting commands
+    * these are actual rcon commands on some servers
+ - Suppress compiler warning (strncpy)
+ - fix erroneous string length in packet building function
+ - Fix typo in ANSI escape sequence for LCYAN
+ - Make stdout and stderr unbuffered
+
 ###### 0.7.1
  - Deprecate `-i` flag for invoking terminal mode
  - Add workaround to prevent server-side bug.

INSTALL.md

@@ -1,11 +1,11 @@
 Building and installing
-------------------------
+-----------------------
 
 Only dependency is C library and POSIX getopt support. 
 
 Compiling with GCC or CLANG:
 
-    cc -std=gnu99 -Wpedantic -Wall -Wextra -Os -s -o mcrcon mcrcon.c
+    cc -std=gnu99 -Wpedantic -Wall -Wextra -O2 -o mcrcon mcrcon.c
     
 Note: on Windows remember to link with winsock by adding `-lws2_32` to your compiler command line.
 

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2012-2020, Tiiffi <tiiffi at gmail>
+Copyright (c) 2012-2021, Tiiffi <tiiffi at gmail>
 
 This software is provided 'as-is', without any express or implied
 warranty. In no event will the authors be held liable for any damages
@@ -18,4 +18,3 @@ freely, subject to the following restrictions:
 
   3. This notice may not be removed or altered from any source
   distribution.
-  

Makefile

@@ -4,7 +4,7 @@
 #   make
 #
 # Windows cross compile:
-#   i686-w64-mingw32-gcc -std=gnu99 -Wall -Wextra -Wpedantic -Os -s -o mcrcon.exe mcrcon.c -lws2_32
+#   x86_64-w64-mingw32-gcc -std=gnu99 -Wall -Wextra -Wpedantic -O2 -fstack-protector-all -o mcrcon.exe mcrcon.c -lws2_32
 
 EXENAME = mcrcon
 PREFIX ?= /usr/local
@@ -14,8 +14,8 @@ LINKER =
 RM = rm -v -f
 
 CC = gcc
-CFLAGS = -std=gnu99 -Wall -Wextra -Wpedantic -Os -s
+CFLAGS = -std=gnu99 -Wall -Wextra -Wpedantic -O2
-EXTRAFLAGS ?= -fstack-protector-strong
+EXTRAFLAGS ?= -fstack-protector-all
 
 ifeq ($(OS), Windows_NT)
 	LINKER = -lws2_32
@@ -23,11 +23,6 @@ ifeq ($(OS), Windows_NT)
 	RM = cmd /C del /F
 endif
 
-ifeq ($(shell uname), Darwin)
-	INSTALL = ginstall
-	CFLAGS = -std=gnu99 -Wall -Wextra -Wpedantic -Os
-endif
-
 .PHONY: all
 all: $(EXENAME)
 
@@ -37,8 +32,8 @@ $(EXENAME): mcrcon.c
 ifneq ($(OS), Windows_NT)
 .PHONY: install
 install:
-	$(INSTALL) -vD $(EXENAME) $(DESTDIR)$(PREFIX)/bin/$(EXENAME)
+	$(INSTALL) -v $(EXENAME) $(DESTDIR)$(PREFIX)/bin/$(EXENAME)
-	$(INSTALL) -vD -m 0644 mcrcon.1 $(DESTDIR)$(PREFIX)/share/man/man1/mcrcon.1
+	$(INSTALL) -v -m 0644 mcrcon.1 $(DESTDIR)$(PREFIX)/share/man/man1/mcrcon.1
 	@echo "\nmcrcon installed. Run 'make uninstall' if you want to uninstall.\n"
 
 .PHONY: uninstall

README.md

@@ -6,24 +6,30 @@ mcrcon is console based Minecraft [rcon](https://developer.valvesoftware.com/wik
 
 ### Installing:
 
-##### via packet manager:
+##### via package manager:
-See https://pkgs.org/download/mcrcon for available packages in various Linux distros (note that available packages might be outdated).
+See https://pkgs.org/download/mcrcon and https://repology.org/project/mcrcon/packages for available packages in various Linux distros (note that some packages might be outdated).
 
-- Gentoo Linux: https://packages.gentoo.org/packages/games-util/mcrcon
+- Fedora: https://packages.fedoraproject.org/pkgs/mcrcon/mcrcon/
-- Arch Linux: https://aur.archlinux.org/packages/mcrcon/
+- Gentoo: https://packages.gentoo.org/packages/games-util/mcrcon
+- Arch: https://aur.archlinux.org/packages/mcrcon/
+- NixOS: https://search.nixos.org/packages?show=mcrcon
+- Snapcraft: https://snapcraft.io/mcrcon-nsg
+- Scoop: https://scoop.sh/#/apps?q=mcrcon
 
 ##### building from sources:
 ```sh
 git clone https://github.com/Tiiffi/mcrcon.git
 cd mcrcon
 make
+
+# install is optional
 sudo make install
 ```
 Check [INSTALL.md](INSTALL.md) for more details.
 
-Precompiled binaries (if provided)*: https://github.com/Tiiffi/mcrcon/releases/latest
+Precompiled binaries*: https://github.com/Tiiffi/mcrcon/releases/latest
 
-<sub>*At the moment binaries are provided for Linux and Windows.</sub>
+<sub>*Binaries are provided for Linux and Windows.</sub>
 
 ---
 
@@ -76,8 +82,7 @@ rcon.password=your_rcon_pasword
 ##### Contact:
 
 * WWW:            https://github.com/Tiiffi/mcrcon/
-* MAIL:           tiiffi at gmail
+* MAIL:           tiiffi+mcrcon at gmail
-* IRC:            tiiffi @ quakenet
 * BUG REPORTS:    https://github.com/Tiiffi/mcrcon/issues/
 
 ---
@@ -87,6 +92,3 @@ rcon.password=your_rcon_pasword
 This project is licensed under the zlib License - see the [LICENSE](LICENSE) file for details.
 
 ---
-
-<sub>Master:</sub> ![Master build](https://api.travis-ci.org/Tiiffi/mcrcon.svg?branch=master)
-<sub>Develop:</sub> ![Develop build](https://api.travis-ci.org/Tiiffi/mcrcon.svg?branch=develop)

mcrcon.1

@@ -1,7 +1,7 @@
 .\" Process this file with
 .\" groff -man -Tascii mcrcon.1
 .\"
-.TH MCRCON 1 "January 2020" "Version 0.7.1"
+.TH MCRCON 1 "November 2024" "Version 0.7.3"
 .SH NAME 
 mcrcon \- send rcon commands to a Minecraft server
 .SH SYNOPSIS

mcrcon.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012-2020, Tiiffi <tiiffi at gmail>
+ * Copyright (c) 2012-2021, Tiiffi <tiiffi at gmail>
  *
  * This software is provided 'as-is', without any express or implied
  * warranty. In no event will the authors be held liable for any damages
@@ -24,8 +24,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
-#include <stdbool.h>
 #include <string.h>
+#include <strings.h>
 #include <signal.h>
 #include <errno.h>
 #include <unistd.h>
@@ -47,7 +47,7 @@
     #include <netdb.h>
 #endif
 
-#define VERSION "0.7.1"
+#define VERSION "0.7.3"
 #define IN_NAME "mcrcon"
 #define VER_STR IN_NAME" "VERSION" (built: "__DATE__" "__TIME__")"
 
@@ -123,8 +123,11 @@ void exit_proc(void)
 }
 
 // Check windows & linux behaviour !!!
-void sighandler(/*int sig*/)
+void sighandler(int sig)
 {
+	if (sig == SIGINT)
+		putchar('\n');
+
 	global_connection_alive = 0;
 	#ifndef _WIN32
 	    exit(EXIT_SUCCESS);
@@ -167,6 +170,10 @@ int main(int argc, char *argv[])
 	if (!port) port = "25575";
 	if (!host) host = "localhost";
 
+	// disable output buffering (https://github.com/Tiiffi/mcrcon/pull/39)
+	setvbuf(stdout, NULL, _IONBF, 0);
+	setvbuf(stderr, NULL, _IONBF, 0);
+
 	if(argc < 1 && pass == NULL) usage();
 
 	// default getopt error handler enabled
@@ -202,7 +209,7 @@ int main(int argc, char *argv[])
 
 	if (pass == NULL) {
 		puts("You must give password (-p password).\nTry 'mcrcon -h' or 'man mcrcon' for help.");
-		return 0;
+		exit(EXIT_FAILURE);
 	}
 
 	if(optind == argc && terminal_mode == 0)
@@ -238,10 +245,7 @@ int main(int argc, char *argv[])
 		exit_code = EXIT_FAILURE;
 	}
 
-	net_close(global_rsock);
+	exit(exit_code);
-	global_rsock = -1;
-
-	return exit_code;
 }
 
 void usage(void)
@@ -429,6 +433,7 @@ rc_packet *net_recv_packet(int sd)
 		return NULL;
 	}
 
+	// NOTE(Tiiffi): This should fail if size is out of spec!
 	if (psize < 10 || psize > DATA_BUFFSIZE) {
 		fprintf(stderr, "Warning: invalid packet size (%d). Must over 10 and less than %d.\n", psize, DATA_BUFFSIZE);
 
@@ -484,7 +489,7 @@ void print_color(int color)
 		"\033[0;1;30m", /* 08 DGREY     0x38 */
 		"\033[0;1;34m", /* 09 LBLUE     0x39 */
 		"\033[0;1;32m", /* 10 LGREEN    0x61 */
-		"\033[0:1;36m", /* 11 LCYAN     0x62 */
+		"\033[0;1;36m", /* 11 LCYAN     0x62 */
 		"\033[0;1;31m", /* 12 LRED      0x63 */
 		"\033[0;1;35m", /* 13 LPURPLE   0x64 */
 		"\033[0;1;33m", /* 14 YELLOW    0x65 */
@@ -564,16 +569,16 @@ rc_packet *packet_build(int id, int cmd, char *s1)
 	static rc_packet packet = {0, 0, 0, { 0x00 }};
 
 	// size + id + cmd + s1 + s2 NULL terminator
-	int s1_len = strlen(s1);
+	int len = strlen(s1);
-	if (s1_len > DATA_BUFFSIZE) {
+	if (len >= DATA_BUFFSIZE) {
-		fprintf(stderr, "Warning: Command string too long (%d). Maximum allowed: %d.\n", s1_len, DATA_BUFFSIZE);
+		fprintf(stderr, "Warning: Command string too long (%d). Maximum allowed: %d.\n", len, DATA_BUFFSIZE - 1);
 		return NULL;
 	}
 
-	packet.size = sizeof(int) * 2 + s1_len + 2;
+	packet.size = sizeof(int) * 2 + len + 2;
 	packet.id = id;
 	packet.cmd = cmd;
-	strncpy(packet.data, s1, DATA_BUFFSIZE);
+	strncpy(packet.data, s1, DATA_BUFFSIZE - 1);
 
 	return &packet;
 }
@@ -590,10 +595,18 @@ int rcon_auth(int sock, char *passwd)
 	if (!ret)
 		return 0; // send failed
 
+receive:
 	packet = net_recv_packet(sock);
 	if (packet == NULL)
 		return 0;
 
+	/* Valve rcon sends empty "RCON_RESPONSEVALUE" packet before real auth response
+	 * so we have to check packet type and try again if necessary.
+	 */
+	if (packet->cmd != RCON_AUTH_RESPONSE) {
+		goto receive;
+	}
+
 	// return 1 if authentication OK
 	return packet->id == -1 ? 0 : 1;
 }
@@ -650,19 +663,18 @@ int run_terminal_mode(int sock)
 	int ret = 0;
 	char command[DATA_BUFFSIZE] = {0x00};
 
-	puts("Logged in. Type 'quit' or 'exit' to quit.");
+	puts("Logged in.\nType 'Q' or press Ctrl-D / Ctrl-C to disconnect.");
 
 	while (global_connection_alive) {
 		putchar('>');
+
 		int len = get_line(command, DATA_BUFFSIZE);
-
+		if (len < 1) continue; 
-		if ((strcasecmp(command, "exit") && strcasecmp(command, "quit")) == 0)
+	
+		if (strcasecmp(command, "Q") == 0)
 			break;
 
-		if(command[0] == 'Q' && command[1] == 0)
+		if (len > 0 && global_connection_alive)
-			break;
-
-		if(len > 0 && global_connection_alive)
 			ret += rcon_command(sock, command);
 
 		/* Special case for "stop" command to prevent server-side bug.
@@ -676,7 +688,7 @@ int run_terminal_mode(int sock)
 			break;
 		}
 
-		command[0] = len = 0;
+		//command[0] = len = 0;
 	}
 
 	return ret;
@@ -686,11 +698,14 @@ int run_terminal_mode(int sock)
 int get_line(char *buffer, int bsize)
 {
 	char *ret = fgets(buffer, bsize, stdin);
-	if (ret == NULL)
+	if (ret == NULL) {
-		exit(EXIT_FAILURE);
+		if (ferror(stdin)) {
-
+			fprintf(stderr, "Error %d: %s\n", errno, strerror(errno));
-	if (buffer[0] == 0)
+			exit(EXIT_FAILURE);
-		global_connection_alive = 0;
+		}
+		putchar('\n');
+		exit(EXIT_SUCCESS);
+	}
 
 	// remove unwanted characters from the buffer
 	buffer[strcspn(buffer, "\r\n")] = '\0';