srogue: add and use more md_* portable functions.

Privileges and memory usage checks are now more portable.

srogue/daemon.c

@@ -173,5 +173,5 @@ do_fuses()
 activity()
 {
 	msg("Daemons = %d : Memory Items = %d : Memory Used = %d",
-	    demoncnt,total,sbrk(0));
+	    demoncnt,total,md_memused());
 }

srogue/list.c

@@ -102,7 +102,7 @@ int size;
 	register char *space = ALLOC(size);
 
 	if (space == NULL) {
-		sprintf(prbuf,"Rogue ran out of memory (%d).",sbrk(0));
+		sprintf(prbuf,"Rogue ran out of memory (%d).", md_memused());
 		fatal(prbuf);
 	}
 	total++;

srogue/main.c

@@ -29,8 +29,6 @@
 #endif
 
 #ifdef BSD
-#define srand48(seed)	srandom(seed)
-#define lrand48()	random()
 #include <sys/time.h>
 #endif
 
@@ -57,13 +55,8 @@ char **envp;
 	if (homedir == NULL)
         	homedir = "";
 
-	playuid = getuid();
+	playuid = md_getuid();
-
+	playgid = md_getgid();
-	if (setuid(playuid) < 0) {
-		printf("Cannot change to effective uid: %d\n", playuid);
-		exit(1);
-	}
-	playgid = getgid();
 
 	/* check for print-score option */
 #ifdef SCOREFILE
@@ -121,6 +114,9 @@ char **envp;
 	}
 #endif
 
+	if (!use_savedir)
+		md_droppriv();
+
 	/* get home and options from environment */
 
 	if ((env = getenv("HOME")) != NULL)
@@ -177,7 +173,7 @@ char **envp;
 
 	fflush(stdout);
 	seed = dnum;
-	srand48(seed);			/* init rnd number gen */
+	srandom(seed);			/* init rnd number gen */
 
 	md_onsignal_exit();		/* just in case */
 
@@ -358,7 +354,7 @@ int range;
 	if (range == 0)
 		wh = 0;
 	else {
-		wh = lrand48() % range;
+		wh = random() % range;
 		wh &= 0x7FFFFFFF;
 	}
 	return wh;

srogue/mdport.c

@@ -413,6 +413,16 @@ md_getuid(void)
 #endif
 }
 
+gid_t
+md_getgid(void)
+{
+#ifdef HAVE_GETGID
+    return( getgid() );
+#else
+    return(42);
+#endif
+}
+
 pid_t
 md_getpid(void)
 {
@@ -1509,3 +1519,51 @@ md_stop_checkout_timer(void)
 
 #endif
 
+long
+md_memused(void)
+{
+#ifdef _WIN32
+    MEMORYSTATUS stat;
+
+    GlobalMemoryStatus(&stat);
+
+    return((long)stat.dwTotalPageFile);
+#else
+    return( (long)sbrk(0) );
+#endif
+}
+
+void
+md_droppriv(void)
+{
+#if defined(HAVE_GETUID)
+	uid_t realuid = getuid();
+
+#if defined(HAVE_SETRESUID)
+    if (setresuid(-1, realuid, realuid) != 0) {
+#elif defined (HAVE_SETREUID) 
+    if (setreuid(realuid, realuid) != 0) {
+#elif defined (HAVE_SETUID)
+    if (setuid(realuid) != 0) {
+#else
+    if (0) {
+#endif
+	printf("Cannot change to effective uid: %d\n", realuid);
+	exit(1);
+    }
+#endif
+}
+
+extern uid_t playuid;
+extern gid_t playgid;
+
+void
+md_resetpriv(void)
+{
+#if defined (HAVE_SETUID)
+	setuid(playuid);
+#endif
+#if defined (HAVE_SETGID)
+	setgid(playgid);
+#endif
+}

srogue/rogue.h

@@ -43,6 +43,7 @@ int	md_erasechar(void);
 char	*md_gethomedir(void);
 char	*md_getusername(void);
 uid_t	md_getuid(void);
+gid_t	md_getgid(void);
 char	*md_getpass(char *prompt);
 pid_t	md_getpid(void);
 char	*md_getrealname(uid_t uid);
@@ -67,6 +68,9 @@ void md_onsignal_autosave(void);
 void md_onsignal_exit(void);
 void md_onsignal_default(void);
 int md_issymlink(char *sp);
+long md_memused(void);
+void md_droppriv(void);
+void md_resetpriv(void);
 char *xcrypt(const char *key, const char *setting);
 
 #define reg     register        /* register abbr.       */

srogue/save.c

@@ -26,10 +26,6 @@
 #include "rogue.h"
 #include "rogue.ext"
 
-#ifdef BSD
-#define srand48(seed)	srandom(seed)
-#endif
-
 EXTCHAR version[];
 EXTCHAR *ctime();
 
@@ -144,8 +140,7 @@ dosave()
 	ignore();
 	if (!use_savedir)
 	{
-		setuid(playuid);
+		md_resetpriv();
-		setgid(playgid);
 	}
 	umask(022);
 
@@ -302,8 +297,7 @@ char *file, **envp;
 				/* set id to unlink file */
 				if(pid == 0)
 				{
-					setuid(playuid);
+					md_resetpriv();
-					setgid(playgid);
 					unlink(file);
 					exit(0);
 				}
@@ -350,6 +344,6 @@ char *file, **envp;
 	strcpy(file_name, file);
 	setup();
 	restscr(cw);
-	srand48(getpid());
+	srandom(getpid());
 	playit();
 }