Bigger patch for (partial) tinylogin integration
- Made a new dir loginutils
- Moved all applets from pwd_grp to loginutils
- Added new applets su.c login.c to loginutils
- Made a new dir libpwdgrp
- Moved everything from pwd_grp/libpwd_grp there
- Added shadow.c to libpwdgrp
- Removed dir pwd_grp
- Added usage strings for login and su to usage.h
- Changed main Makefile to reflect the dir rearrangements
[Parts of this patch may overlap with my other two patches]
diff --git a/libpwdgrp/initgroups.c b/libpwdgrp/initgroups.c
new file mode 100644
index 0000000..9b5dcbc
--- /dev/null
+++ b/libpwdgrp/initgroups.c
@@ -0,0 +1,115 @@
+/*
+ * initgroups.c - This file is part of the libc-8086/grp package for ELKS,
+ * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include "busybox.h"
+
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include "grp.h"
+
+/*
+ * Define GR_SCALE_DYNAMIC if you want grp to dynamically scale its read buffer
+ * so that lines of any length can be used. On very very small systems,
+ * you may want to leave this undefined becasue it will make the grp functions
+ * somewhat larger (because of the inclusion of malloc and the code necessary).
+ * On larger systems, you will want to define this, because grp will _not_
+ * deal with long lines gracefully (they will be skipped).
+ */
+#undef GR_SCALE_DYNAMIC
+
+#ifndef GR_SCALE_DYNAMIC
+/*
+ * If scaling is not dynamic, the buffers will be statically allocated, and
+ * maximums must be chosen. GR_MAX_LINE_LEN is the maximum number of
+ * characters per line in the group file. GR_MAX_MEMBERS is the maximum
+ * number of members of any given group.
+ */
+#define GR_MAX_LINE_LEN 128
+/* GR_MAX_MEMBERS = (GR_MAX_LINE_LEN-(24+3+6))/9 */
+#define GR_MAX_MEMBERS 11
+
+#endif /* !GR_SCALE_DYNAMIC */
+
+
+/*
+ * Define GR_DYNAMIC_GROUP_LIST to make initgroups() dynamically allocate
+ * space for it's GID array before calling setgroups(). This is probably
+ * unnecessary scalage, so it's undefined by default.
+ */
+#undef GR_DYNAMIC_GROUP_LIST
+
+#ifndef GR_DYNAMIC_GROUP_LIST
+/*
+ * GR_MAX_GROUPS is the size of the static array initgroups() uses for
+ * its static GID array if GR_DYNAMIC_GROUP_LIST isn't defined.
+ */
+#define GR_MAX_GROUPS 64
+
+#endif /* !GR_DYNAMIC_GROUP_LIST */
+
+int initgroups(__const char *user, gid_t gid)
+{
+ register struct group *group;
+
+#ifndef GR_DYNAMIC_GROUP_LIST
+ gid_t group_list[GR_MAX_GROUPS];
+#else
+ gid_t *group_list = NULL;
+#endif
+ register char **tmp_mem;
+ int num_groups;
+ int grp_fd;
+
+
+ if ((grp_fd = open("/etc/group", O_RDONLY)) < 0)
+ return -1;
+
+ num_groups = 0;
+#ifdef GR_DYNAMIC_GROUP_LIST
+ group_list = (gid_t *) realloc(group_list, 1);
+#endif
+ group_list[num_groups] = gid;
+#ifndef GR_DYNAMIC_GROUP_LIST
+ while (num_groups < GR_MAX_GROUPS &&
+ (group = __getgrent(grp_fd)) != NULL)
+#else
+ while ((group = __getgrent(grp_fd)) != NULL)
+#endif
+ {
+ if (group->gr_gid != gid);
+ {
+ tmp_mem = group->gr_mem;
+ while (*tmp_mem != NULL) {
+ if (!strcmp(*tmp_mem, user)) {
+ num_groups++;
+#ifdef GR_DYNAMIC_GROUP_LIST
+ group_list = (gid_t *) realloc(group_list, num_groups *
+ sizeof(gid_t *));
+#endif
+ group_list[num_groups] = group->gr_gid;
+ }
+ tmp_mem++;
+ }
+ }
+ }
+ close(grp_fd);
+ return setgroups(num_groups, group_list);
+}