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]

1 files changed, 183 insertions, 0 deletions

diff --git a/loginutils/deluser.c b/loginutils/deluser.c
new file mode 100644
index 000000000..481a716e7
--- /dev/null
+++ b/loginutils/deluser.c
@@ -0,0 +1,183 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * deluser (remove lusers from the system ;) for TinyLogin
+ *
+ * Copyright (C) 1999 by Lineo, inc. and John Beppu
+ * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "busybox.h"
+
+#define PASSWD_FILE     "/etc/passwd"
+#define GROUP_FILE      "/etc/group"
+#define SHADOW_FILE             "/etc/shadow"
+#define GSHADOW_FILE    "/etc/gshadow"
+
+
+/* where to start and stop deletion */
+typedef struct {
+        size_t start;
+        size_t stop;
+} Bounds;
+
+/* An interesting side-effect of boundary()'s
+ * implementation is that the first user (typically root)
+ * cannot be removed.  Let's call it a feature. */
+static inline Bounds boundary(const char *buffer, const char *login)
+{
+        char needle[256];
+        char *start;
+        char *stop;
+        Bounds b;
+
+        snprintf(needle, 256, "\n%s:", login);
+        needle[255] = 0;
+        start = strstr(buffer, needle);
+        if (!start) {
+                b.start = 0;
+                b.stop = 0;
+                return b;
+        }
+        start++;
+
+        stop = index(start, '\n');      /* index is a BSD-ism */
+        b.start = start - buffer;
+        b.stop = stop - buffer;
+        return b;
+}
+
+/* grep -v ^login (except it only deletes the first match) */
+/* ...in fact, I think I'm going to simplify this later */
+static int del_line_matching(const char *login, const char *filename)
+{
+        char *buffer;
+        FILE *passwd;
+        size_t len;
+        Bounds b;
+        struct stat statbuf;
+
+        /* load into buffer */
+        passwd = fopen(filename, "r");
+        if (!passwd) {
+                return 1;
+        }
+        stat(filename, &statbuf);
+        len = statbuf.st_size;
+        buffer = (char *) malloc(len * sizeof(char));
+
+        if (!buffer) {
+                fclose(passwd);
+                return 1;
+        }
+        fread(buffer, len, sizeof(char), passwd);
+
+        fclose(passwd);
+
+        /* find the user to remove */
+        b = boundary(buffer, login);
+        if (b.stop == 0) {
+                free(buffer);
+                return 1;
+        }
+
+        /* write the file w/o the user */
+        passwd = fopen(filename, "w");
+        if (!passwd) {
+                return 1;
+        }
+        fwrite(buffer, (b.start - 1), sizeof(char), passwd);
+        fwrite(&buffer[b.stop], (len - b.stop), sizeof(char), passwd);
+
+        fclose(passwd);
+
+        return 0;
+}
+
+/* ________________________________________________________________________ */
+int delgroup_main(int argc, char **argv)
+{
+        /* int successful; */
+        int failure;
+
+        if (argc != 2) {
+                show_usage();
+        } else {
+
+                failure = del_line_matching(argv[1], GROUP_FILE);
+#ifdef CONFIG_FEATURE_SHADOWPASSWDS
+                if (access(GSHADOW_FILE, W_OK) == 0) {
+                        /* EDR the |= works if the error is not 0, so he had it wrong */
+                        failure |= del_line_matching(argv[1], GSHADOW_FILE);
+                }
+#endif                                                  /* CONFIG_FEATURE_SHADOWPASSWDS */
+                /* if (!successful) { */
+                if (failure) {
+                        error_msg_and_die("%s: Group could not be removed\n", argv[1]);
+                }
+
+        }
+        return (EXIT_SUCCESS);
+}
+
+/* ________________________________________________________________________ */
+int deluser_main(int argc, char **argv)
+{
+        /* int successful; */
+        int failure;
+
+        if (argc != 2) {
+                show_usage();
+        } else {
+
+                failure = del_line_matching(argv[1], PASSWD_FILE);
+                /* if (!successful) { */
+                if (failure) {
+                        error_msg_and_die("%s: User could not be removed from %s\n",
+                                                          argv[1], PASSWD_FILE);
+                }
+#ifdef CONFIG_FEATURE_SHADOWPASSWDS
+                failure = del_line_matching(argv[1], SHADOW_FILE);
+                /* if (!successful) { */
+                if (failure) {
+                        error_msg_and_die("%s: User could not be removed from %s\n",
+                                                          argv[1], SHADOW_FILE);
+                }
+                failure = del_line_matching(argv[1], GSHADOW_FILE);
+                /* if (!successful) { */
+                if (failure) {
+                        error_msg_and_die("%s: User could not be removed from %s\n",
+                                                          argv[1], GSHADOW_FILE);
+                }
+#endif                                                  /* CONFIG_FEATURE_SHADOWPASSWDS */
+                failure = del_line_matching(argv[1], GROUP_FILE);
+                /* if (!successful) { */
+                if (failure) {
+                        error_msg_and_die("%s: User could not be removed from %s\n",
+                                                          argv[1], GROUP_FILE);
+                }
+
+        }
+        return (EXIT_SUCCESS);
+}
+
+/* $Id: deluser.c,v 1.1 2002/06/04 20:45:05 sandman Exp $ */