reapplied maxims patches

src/common.c

@@ -111,3 +111,20 @@ read_password(char *buf, size_t len)
 	strncpy(buf, pwd, len);
 	buf[len-1] = '\0';
 }
+
+int
+check_topdomain(char *str)
+{
+       int i;
+
+       if(str[0] == '.') /* special case */
+               return 1;
+
+       for( i = 0; i < strlen(str); i++) {
+               if( isalpha(str[i]) || isdigit(str[i]) || str[i] == '-' || str[i] == '.' )
+                       continue;
+               else 
+		       return 1;
+       }
+       return 0;
+}

src/common.h

@@ -54,4 +54,6 @@ void do_detach();
 
 void read_password(char*, size_t);
 
+int check_topdomain(char *);
+
 #endif

src/iodine.c

@@ -690,8 +690,13 @@ main(int argc, char **argv)
 
 	set_nameserver(nameserv_addr);
 
-	if (strlen(topdomain) > 128 || topdomain[0] == '.') {
+	if(strlen(topdomain) <= 128) {
-		warnx("Use a topdomain max 128 chars long. Do not start it with a dot.\n");
+		if(check_topdomain(topdomain)) {
+			warnx("Topdomain contains invalid characters.\n");
+			usage();
+		}
+	} else {
+		warnx("Use a topdomain max 128 chars long.\n");
 		usage();
 	}
 

src/iodined.c

@@ -490,10 +490,6 @@ main(int argc, char **argv)
 			break;
 		case 'p':
 			port = atoi(optarg);
-			if (port) {
-				printf("ALERT! Other dns servers expect you to run on port 53.\n");
-				printf("You must manually forward port 53 to port %d for things to work.\n", port);
-			}
 			break;
 		case 'P':
 			strncpy(password, optarg, sizeof(password));
@@ -520,8 +516,13 @@ main(int argc, char **argv)
 		usage();
 
 	topdomain = strdup(argv[1]);
-	if (strlen(topdomain) > 128 || topdomain[0] == '.') {
+	if(strlen(topdomain) <= 128) {
-		warnx("Use a topdomain max 128 chars long. Do not start it with a dot.\n");
+		if(check_topdomain(topdomain)) {
+			warnx("Topdomain contains invalid characters.\n");
+			usage();
+		}
+	} else {
+		warnx("Use a topdomain max 128 chars long.\n");
 		usage();
 	}
 
@@ -532,10 +533,20 @@ main(int argc, char **argv)
 		}
 	}
 
-	if (mtu == 0) {
+	if (mtu <= 0) {
 		warnx("Bad MTU given.\n");
 		usage();
 	}
+	
+	if(port < 1 || port > 65535) {
+		warnx("Bad port number given.\n");
+		usage();
+	}
+	
+	if (port != 53) {
+		printf("ALERT! Other dns servers expect you to run on port 53.\n");
+		printf("You must manually forward port 53 to port %d for things to work.\n", port);
+	}
 
 	if (listen_ip == INADDR_NONE) {
 		warnx("Bad IP address to listen on.\n");