diff options
| author | Doug Freed <dwfreed@mtu.edu> | 2016-12-19 00:43:27 +0000 |
|---|---|---|
| committer | William Hubbs <w.d.hubbs@gmail.com> | 2016-12-19 18:24:31 -0600 |
| commit | 45aa36cc623eeeb15fb6827b57e0c07a37cdef41 (patch) | |
| tree | 6e50402f98f973673143df0933aae6aff9bf85e8 /src/librc | |
| parent | d3f833179b39368442221c448f90b87f76d28ee8 (diff) | |
librc: detect loops in stacked runlevels and abort
This fixes #109.
X-Gentoo-Bug: 558700
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=558700
Diffstat (limited to 'src/librc')
| -rw-r--r-- | src/librc/librc.c | 35 |
1 files changed, 29 insertions, 6 deletions
diff --git a/src/librc/librc.c b/src/librc/librc.c index fdde3d5a..3d3277db 100644 --- a/src/librc/librc.c +++ b/src/librc/librc.c @@ -367,11 +367,12 @@ rc_parse_service_state(RC_SERVICE state) * specified runlevel in dependency order, including the * specified runlevel. */ static void -get_runlevel_chain(const char *runlevel, RC_STRINGLIST *level_list) +get_runlevel_chain(const char *runlevel, RC_STRINGLIST *level_list, RC_STRINGLIST *ancestor_list) { char path[PATH_MAX]; RC_STRINGLIST *dirs; - RC_STRING *d, *dn; + RC_STRING *d, *parent; + const char *nextlevel; /* * If we haven't been passed a runlevel or a level list, or @@ -395,8 +396,27 @@ get_runlevel_chain(const char *runlevel, RC_STRINGLIST *level_list) */ snprintf(path, sizeof(path), "%s/%s", RC_RUNLEVELDIR, runlevel); dirs = ls_dir(path, LS_DIR); - TAILQ_FOREACH_SAFE(d, dirs, entries, dn) - get_runlevel_chain(d->value, level_list); + TAILQ_FOREACH(d, dirs, entries) { + nextlevel = d->value; + + /* Check for loop */ + if (rc_stringlist_find(ancestor_list, nextlevel)) { + fprintf(stderr, "Loop detected in stacked runlevels attempting to enter runlevel %s!\n", + nextlevel); + fprintf(stderr, "Ancestors:\n"); + TAILQ_FOREACH(parent, ancestor_list, entries) + fprintf(stderr, "\t%s\n", parent->value); + exit(1); + } + + /* Add new ancestor */ + rc_stringlist_add(ancestor_list, nextlevel); + + get_runlevel_chain(nextlevel, level_list, ancestor_list); + + rc_stringlist_delete(ancestor_list, nextlevel); + } + rc_stringlist_free(dirs); } bool @@ -500,9 +520,12 @@ librc_hidden_def(rc_runlevel_unstack) RC_STRINGLIST * rc_runlevel_stacks(const char *runlevel) { - RC_STRINGLIST *stack; + RC_STRINGLIST *stack, *ancestor_list; stack = rc_stringlist_new(); - get_runlevel_chain(runlevel, stack); + ancestor_list = rc_stringlist_new(); + rc_stringlist_add(ancestor_list, runlevel); + get_runlevel_chain(runlevel, stack, ancestor_list); + rc_stringlist_free(ancestor_list); return stack; } librc_hidden_def(rc_runlevel_stacks) |