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-rw-r--r--toys/lsb/umount.c87
1 files changed, 28 insertions, 59 deletions
diff --git a/toys/lsb/umount.c b/toys/lsb/umount.c
index 002ffd68..c7998e41 100644
--- a/toys/lsb/umount.c
+++ b/toys/lsb/umount.c
@@ -37,53 +37,44 @@ GLOBALS(
char *types;
)
-// todo
+// todo (done?)
// borrow df code to identify filesystem?
// umount -a from fstab
// umount when getpid() not 0, according to fstab
// lookup mount: losetup -d, bind, file, block
+// loopback delete
+// fstab -o user
// TODO
-// loopback delete
-// fstab -o user
+// swapon, swapoff
-// Realloc *old with oldstring,newstring
-
-void comma_collate(char **old, char *new)
-{
- char *temp, *atold = *old;
-
- // Only add a comma if old string didn't end with one
- if (atold && *atold) {
- char *comma = ",";
-
- if (atold[strlen(atold)-1] == ',') comma = "";
- temp = xmprintf("%s%s%s", atold, comma, new);
- } else temp = xstrdup(new);
- free (atold);
- *old = temp;
-}
-
-// iterate through strings in a comma separated list.
-// returns start of next entry or NULL if none
-// sets *len to length of entry (not including comma)
-// advances *list to start of next entry
-char *comma_iterate(char **list, int *len)
+static void do_umount(char *dir, char *dev, int flags)
{
- char *start = *list, *end;
+ // is it ok for this user to umount this mount?
+ if (CFG_TOYBOX_SUID && getuid()) {
+ struct mtab_list *mt = dlist_terminate(xgetmountlist("/etc/fstab"));
+ int len, user = 0;
+
+ while (mt) {
+ struct mtab_list *mtemp = mt;
+ char *s;
+
+ if (!strcmp(mt->dir, dir)) while ((s = comma_iterate(&mt->opts, &len))) {
+ if (len == 4 && strncmp(s, "user", 4)) user = 1;
+ else if (len == 6 && strncmp(s, "nouser", 6)) user = 0;
+ }
- if (!*list) return 0;
+ mt = mt->next;
+ free(mtemp);
+ }
- if (!(end = strchr(*list, ','))) {
- *len = strlen(*list);
- *list = 0;
- } else *list += (*len = end-start)+1;
+ if (!user) {
+ error_msg("not root");
- return start;
-}
+ return;
+ }
+ }
-static void do_umount(char *dir, char *dev, int flags)
-{
if (!umount2(dir, flags)) {
if (toys.optflags & FLAG_v) xprintf("%s unmounted\n", dir);
@@ -136,30 +127,8 @@ void umount_main(void)
struct arg_list *tal;
for (tal = TT.t; tal; tal = tal->next) comma_collate(&typestr, tal->arg);
- for (ml = mlrev; ml; ml = ml->prev) {
- if (typestr) {
- char *type, *types = typestr;
- int len, skip = strncmp(types, "no", 2);
-
- for (;;) {
- if (!(type = comma_iterate(&types, &len))) break;
- if (!skip) {
- // If one -t starts with "no", the rest must too
- if (strncmp(type, "no", 2)) error_exit("bad -t");
- if (!strncmp(type+2, ml->type, len-2)) {
- skip = 1;
- break;
- }
- } else if (!strncmp(type, ml->type, len) && !ml->type[len]) {
- skip = 0;
- break;
- }
- }
- if (skip) continue;
- }
-
- do_umount(ml->dir, ml->device, flags);
- }
+ for (ml = mlrev; ml; ml = ml->prev)
+ if (mountlist_istype(ml, typestr)) do_umount(ml->dir, ml->device, flags);
if (CFG_TOYBOX_FREE) {
free(typestr);
llist_traverse(mlsave, free);