+ * Get effective group ID from group name.
+ * Input arguments:
+ * pl :program list struct with group name
+ * gid :group id to fallback in case egid cannot be determined.
+ * Returns:
+ * egid effective group id if successfull,
+ * -1 if group is not defined/not found.
+ * -2 for any buffer allocation error.
+ */
+static int getegr_id(program_list_t *pl, int gid) /* {{{ */
+{
+ if (pl->group == NULL) {
+ return -1;
+ }
+ if (strcmp(pl->group, "") == 0) {
+ return gid;
+ }
+ struct group *gr_ptr = NULL;
+ struct group gr;
+
+ long int grbuf_size = sysconf(_SC_GETGR_R_SIZE_MAX);
+ if (grbuf_size <= 0)
+ grbuf_size = sysconf(_SC_PAGESIZE);
+ if (grbuf_size <= 0)
+ grbuf_size = 4096;
+
+ char *temp = NULL;
+ char *grbuf = NULL;
+
+ do {
+ temp = realloc(grbuf, grbuf_size);
+ if (temp == NULL) {
+ ERROR("exec plugin: getegr_id for %s: realloc buffer[%ld] failed ",
+ pl->group, grbuf_size);
+ sfree(grbuf);
+ return -2;
+ }
+ grbuf = temp;
+ if (getgrnam_r(pl->group, &gr, grbuf, grbuf_size, &gr_ptr) == 0) {
+ sfree(grbuf);
+ if (gr_ptr == NULL) {
+ ERROR("exec plugin: No such group: `%s'", pl->group);
+ return -1;
+ }
+ return gr.gr_gid;
+ } else if (errno == ERANGE) {
+ grbuf_size += grbuf_size; // increment buffer size and try again
+ } else {
+ ERROR("exec plugin: getegr_id failed %s", STRERRNO);
+ sfree(grbuf);
+ return -2;
+ }
+ } while (grbuf_size <= MAX_GRBUF_SIZE);
+ ERROR("exec plugin: getegr_id Max grbuf size reached for %s", pl->group);
+ sfree(grbuf);
+ return -2;
+}
+
+/*