bb_getpwuid, bb_getgrgid: change order of arguments to more intuitive one;

comment thoroughly when they die and when they dont.

coreutils/id.c

@@ -20,13 +20,13 @@
 #define JUST_USER         4
 #define JUST_GROUP        8
 #if ENABLE_SELINUX
-#define JUST_CONTEXT    16
+#define JUST_CONTEXT     16
 #endif
 
-static short printf_full(unsigned int id, const char *arg, const char prefix)
+static int printf_full(unsigned int id, const char *arg, const char prefix)
 {
 	const char *fmt = "%cid=%u";
-	short status = EXIT_FAILURE;
+	int status = EXIT_FAILURE;
 
 	if (arg) {
 		fmt = "%cid=%u(%s)";
@@ -71,8 +71,8 @@ int id_main(int argc, char **argv)
 	if (flags & (JUST_GROUP | JUST_USER USE_SELINUX(| JUST_CONTEXT))) {
 		/* JUST_GROUP and JUST_USER are mutually exclusive */
 		if (flags & NAME_NOT_NUMBER) {
-			/* bb_getpwuid and bb_getgrgid exit on failure so puts cannot segfault */
+			/* bb_getXXXid(-1) exit on failure, puts cannot segfault */
-			puts((flags & JUST_USER) ? bb_getpwuid(NULL, uid, -1 ) : bb_getgrgid(NULL, gid, -1 ));
+			puts((flags & JUST_USER) ? bb_getpwuid(NULL, -1, uid) : bb_getgrgid(NULL, -1, gid));
 		} else {
 			if (flags & JUST_USER) {
 				printf("%u\n", uid);
@@ -100,11 +100,10 @@ int id_main(int argc, char **argv)
 	}
 
 	/* Print full info like GNU id */
-	/* bb_getpwuid doesn't exit on failure here */
+	/* bb_getpwuid(0) doesn't exit on failure (returns NULL) */
-	status = printf_full(uid, bb_getpwuid(NULL, uid, 0), 'u');
+	status = printf_full(uid, bb_getpwuid(NULL, 0, uid), 'u');
 	putchar(' ');
-	/* bb_getgrgid doesn't exit on failure here */
+	status |= printf_full(gid, bb_getgrgid(NULL, 0, gid), 'g');
-	status |= printf_full(gid, bb_getgrgid(NULL, gid, 0), 'g');
 
 #if ENABLE_SELINUX
 	if (is_selinux_enabled()) {

coreutils/whoami.c

@@ -19,7 +19,8 @@ int whoami_main(int argc, char **argv)
 	if (argc > 1)
 		bb_show_usage();
 
-	puts(bb_getpwuid(NULL, geteuid(), -1));
+	/* Will complain and die if username not found */
+	puts(bb_getpwuid(NULL, -1, geteuid()));
 
 	return fflush(stdout);
 }

include/libbb.h

@@ -481,10 +481,14 @@ struct bb_uidgid_t {
 int get_uidgid(struct bb_uidgid_t*, const char*, int numeric_ok);
 /* chown-like handling of "user[:[group]" */
 void parse_chown_usergroup_or_die(struct bb_uidgid_t *u, char *user_group);
-/* what is this? */
+/* bb_getpwuid, bb_getgrgid:
-/*extern char *bb_getug(char *buffer, char *idname, long id, int bufsize, char prefix);*/
+bb_getXXXid(buf, bufsz, id) - copy user/group name or id
-char *bb_getpwuid(char *name, long uid, int bufsize);
+                as a string to buf, return user/group name or NULL
-char *bb_getgrgid(char *group, long gid, int bufsize);
+bb_getXXXid(NULL, 0, id) - return user/group name or NULL
+bb_getXXXid(NULL, -1, id) - return user/group name or exit
+*/
+char *bb_getpwuid(char *name, int bufsize, long uid);
+char *bb_getgrgid(char *group, int bufsize, long gid);
 /* versions which cache results (useful for ps, ls etc) */
 const char* get_cached_username(uid_t uid);
 const char* get_cached_groupname(gid_t gid);
@@ -596,6 +600,7 @@ extern const char *opt_complementary;
 extern const char *applet_long_options;
 #endif
 extern uint32_t option_mask32;
+/* TODO: don't pass argc, determine it by looking at argv */
 extern uint32_t getopt32(int argc, char **argv, const char *applet_opts, ...);
 
 

libbb/bb_pwd.c

@@ -11,22 +11,20 @@
 
 #define assert(x) ((void)0)
 
-/*
- * if bufsize is > 0 char *buffer cannot be set to NULL.
- *                   If idname is not NULL it is written on the static
- *                   allocated buffer (and a pointer to it is returned).
- *                   if idname is NULL, id as string is written to the static
- *                   allocated buffer and NULL is returned.
- * if bufsize is = 0 char *buffer can be set to NULL.
- *                   If idname exists a pointer to it is returned,
- *                   else NULL is returned.
- * if bufsize is < 0 char *buffer can be set to NULL.
- *                   If idname exists a pointer to it is returned,
- *                   else an error message is printed and the program exits.
- */
-
 /* internal function for bb_getpwuid and bb_getgrgid */
-static char* bb_getug(char *buffer, char *idname, long id, int bufsize, char prefix)
+/* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
+ * flexible:
+ *
+ * bufsize > 0:      If idname is not NULL it is copied to buffer,
+ *                   and buffer is returned. Else id as string is written
+ *                   to buffer, and NULL is returned.
+ *
+ * bufsize == 0:     idname is returned.
+ *
+ * bufsize < 0:      If idname is not NULL it is returned.
+ *                   Else an error message is printed and the program exits.
+ */
+static char* bb_getug(char *buffer, int bufsize, char *idname, long id, char prefix)
 {
 	if (bufsize > 0) {
 		assert(buffer != NULL);
@@ -40,31 +38,29 @@ static char* bb_getug(char *buffer, char *idname, long id, int bufsize, char pre
 	return idname;
 }
 
-/* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
+/* bb_getpwuid, bb_getgrgid:
- * flexible :
+ * bb_getXXXid(buf, bufsz, id) - copy user/group name or id
- *
+ *               as a string to buf, return user/group name or NULL
- * if bufsize is > 0 char *group cannot be set to NULL.
+ * bb_getXXXid(NULL, 0, id) - return user/group name or NULL
- *                   On success groupname is written on static allocated buffer
+ * bb_getXXXid(NULL, -1, id) - return user/group name or exit
- *                   group (and a pointer to it is returned).
- *                   On failure gid as string is written to static allocated
- *                   buffer group and NULL is returned.
- * if bufsize is = 0 char *group can be set to NULL.
- *                   On success groupname is returned.
- *                   On failure NULL is returned.
- * if bufsize is < 0 char *group can be set to NULL.
- *                   On success groupname is returned.
- *                   On failure an error message is printed and
- *                   the program exits.
  */
+/* gets a username given a uid */
+char* bb_getpwuid(char *name, int bufsize, long uid)
+{
+	struct passwd *myuser = getpwuid(uid);
 
+	return bb_getug(name, bufsize,
+			(myuser ? myuser->pw_name : (char*)myuser),
+			uid, 'u');
+}
 /* gets a groupname given a gid */
-char* bb_getgrgid(char *group, long gid, int bufsize)
+char* bb_getgrgid(char *group, int bufsize, long gid)
 {
 	struct group *mygroup = getgrgid(gid);
 
-	return bb_getug(group,
+	return bb_getug(group, bufsize,
-			mygroup ? mygroup->gr_name : (char *)mygroup,
+			(mygroup ? mygroup->gr_name : (char*)mygroup),
-			gid, bufsize, 'g');
+			gid, 'g');
 }
 
 /* returns a gid given a group name */
@@ -91,32 +87,6 @@ long xuname2uid(const char *name)
 	return myuser->pw_uid;
 }
 
-/* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
- * flexible :
- *
- * if bufsize is > 0 char *name cannot be set to NULL.
- *                   On success username is written on the static allocated
- *                   buffer name (and a pointer to it is returned).
- *                   On failure uid as string is written to the static
- *                   allocated buffer name and NULL is returned.
- * if bufsize is = 0 char *name can be set to NULL.
- *                   On success username is returned.
- *                   On failure NULL is returned.
- * if bufsize is < 0 char *name can be set to NULL
- *                   On success username is returned.
- *                   On failure an error message is printed and
- *                   the program exits.
- */
-
-/* gets a username given a uid */
-char* bb_getpwuid(char *name, long uid, int bufsize)
-{
-	struct passwd *myuser = getpwuid(uid);
-
-	return bb_getug(name, myuser ? myuser->pw_name : (char *)myuser,
-				uid, bufsize, 'u');
-}
-
 unsigned long get_ug_id(const char *s,
 		long (*xname2id)(const char *))
 {

libbb/procps.c

@@ -52,7 +52,7 @@ static int get_cached(cache_t *cp, unsigned id)
 }
 #endif
 
-typedef char* ug_func(char *name, long uid, int bufsize);
+typedef char* ug_func(char *name, int bufsize, long uid);
 static char* get_cached(cache_t *cp, unsigned id, ug_func* fp)
 {
 	int i;
@@ -62,7 +62,8 @@ static char* get_cached(cache_t *cp, unsigned id, ug_func* fp)
 	i = cp->size++;
 	cp->cache = xrealloc(cp->cache, cp->size * sizeof(*cp->cache));
 	cp->cache[i].id = id;
-	fp(cp->cache[i].name, id, sizeof(cp->cache[i].name));
+	/* Never fails. Generates numeric string if name isn't found */
+	fp(cp->cache[i].name, sizeof(cp->cache[i].name), id);
 	return cp->cache[i].name;
 }
 const char* get_cached_username(uid_t uid)

loginutils/passwd.c

@@ -51,13 +51,13 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
 		goto err_ret;
 	}
 
-	/*memset(salt, 0, sizeof(salt)); - why?*/
 	crypt_make_salt(salt, 1, 0); /* des */
 	if (algo) { /* MD5 */
 		strcpy(salt, "$1$");
 		crypt_make_salt(salt + 3, 4, 0);
 	}
-	ret = xstrdup(pw_encrypt(newp, salt)); /* returns ptr to static */
+	/* pw_encrypt returns ptr to static */
+	ret = xstrdup(pw_encrypt(newp, salt));
 	/* whee, success! */
 
  err_ret:
@@ -80,7 +80,7 @@ int passwd_main(int argc, char **argv)
 		OPT_delete = 0x8, /* -d - delete password */
 		OPT_lud = 0xe,
 		STATE_ALGO_md5 = 0x10,
-		/*STATE_ALGO_des = 0x20, not needed yet */
+		//STATE_ALGO_des = 0x20, not needed yet
 	};
 	unsigned opt;
 	int rc;
@@ -104,7 +104,7 @@ int passwd_main(int argc, char **argv)
 	logmode = LOGMODE_BOTH;
 	openlog(applet_name, LOG_NOWAIT, LOG_AUTH);
 	opt = getopt32(argc, argv, "a:lud", &opt_a);
-	argc -= optind;
+	//argc -= optind;
 	argv += optind;
 
 	if (strcasecmp(opt_a, "des") != 0) /* -a */
@@ -112,11 +112,13 @@ int passwd_main(int argc, char **argv)
 	//else
 	//	opt |= STATE_ALGO_des;
 	myuid = getuid();
-	if ((opt & OPT_lud) && (!argc || myuid))
+	/* -l, -u, -d require root priv and username argument */
+	if ((opt & OPT_lud) && (myuid || !argv[0]))
 		bb_show_usage();
 
-	myname = xstrdup(bb_getpwuid(NULL, myuid, -1));
+	/* Will complain and die if username not found */
-	name = argc ? argv[0] : myname;
+	myname = xstrdup(bb_getpwuid(NULL, -1, myuid));
+	name = argv[0] ? argv[0] : myname;
 
 	pw = getpwnam(name);
 	if (!pw) bb_error_msg_and_die("unknown user %s", name);
@@ -158,9 +160,12 @@ int passwd_main(int argc, char **argv)
 		newp = xasprintf("!%s", pw->pw_passwd);
 	} else if (opt & OPT_unlock) {
 		if (c) goto skip; /* not '!' */
+		/* pw->pw_passwd pints to static storage,
+		 * strdup'ing to avoid nasty surprizes */
 		newp = xstrdup(&pw->pw_passwd[1]);
 	} else if (opt & OPT_delete) {
-		newp = xstrdup("");
+		//newp = xstrdup("");
+		newp = (char*)"";
 	}
 
 	rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
@@ -177,8 +182,8 @@ int passwd_main(int argc, char **argv)
 				filename);
 	bb_info_msg("Password for %s changed by %s", name, myname);
 
-	if (ENABLE_FEATURE_CLEAN_UP) free(newp);
+	//if (ENABLE_FEATURE_CLEAN_UP) free(newp);
-skip:
+ skip:
 	if (!newp) {
 		bb_error_msg_and_die("password for %s is already %slocked",
 			name, (opt & OPT_unlock) ? "un" : "");

sysklogd/logger.c

@@ -89,7 +89,7 @@ int logger_main(int argc, char **argv)
 	char name[80];
 
 	/* Fill out the name string early (may be overwritten later) */
-	bb_getpwuid(name, geteuid(), sizeof(name));
+	bb_getpwuid(name, sizeof(name), geteuid());
 	str_t = name;
 
 	/* Parse any options */