fuse: fill frame->root->groups with aux gids of the process

Pick the groups in /proc/<pid>/status from the line starting
with "Groups: " by parsing the list of integers which follow

Signed-off-by: Anand Avati <avati@gluster.com>

BUG: 2815 (Server-enforced ACLs)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2815

1 files changed, 53 insertions, 0 deletions

diff --git a/xlators/mount/fuse/src/fuse-helpers.c b/xlators/mount/fuse/src/fuse-helpers.c
index cd35d719214..d0dad29a409 100644
--- a/xlators/mount/fuse/src/fuse-helpers.c
+++ b/xlators/mount/fuse/src/fuse-helpers.c
@@ -134,6 +134,57 @@ get_fuse_state (xlator_t *this, fuse_in_header_t *finh)
 }
 
 
+void
+frame_fill_groups (call_frame_t *frame)
+{
+        char         filename[128];
+        char         line[128];
+        char        *ptr = NULL;
+        int          ret = 0;
+        FILE        *fp = NULL;
+        int          idx = 0;
+        long int     id = 0;
+        char        *saveptr = NULL;
+        char        *endptr = NULL;
+
+        ret = snprintf (filename, 128, "/proc/%d/status", frame->root->pid);
+        if (ret == 128)
+                goto out;
+
+        fp = fopen (filename, "r");
+        if (!fp)
+                goto out;
+
+        while ((ptr = fgets (line, 128, fp))) {
+                if (strncmp (ptr, "Groups:", 7) != 0)
+                        continue;
+
+                ptr = line + 8;
+
+                for (ptr = strtok_r (ptr, " \t\r\n", &saveptr);
+                     ptr;
+                     ptr = strtok_r (NULL, " \t\r\n", &saveptr)) {
+                        errno = 0;
+                        id = strtol (ptr, &endptr, 0);
+                        if (errno == ERANGE)
+                                break;
+                        if (!endptr || *endptr)
+                                break;
+                        frame->root->groups[idx++] = id;
+                        if (idx == GF_REQUEST_MAXGROUPS)
+                                break;
+                }
+
+                frame->root->ngrps = idx;
+                break;
+        }
+out:
+        if (fp)
+                fclose (fp);
+        return;
+}
+
+
 call_frame_t *
 get_call_frame_for_req (fuse_state_t *state)
 {
@@ -160,6 +211,8 @@ get_call_frame_for_req (fuse_state_t *state)
                 frame->root->unique   = finh->unique;
         }
 
+        frame_fill_groups (frame);
+
         if (priv && priv->client_pid_set)
                 frame->root->pid = priv->client_pid;