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authorEric Andersen2003-07-14 20:20:45 +0000
committerEric Andersen2003-07-14 20:20:45 +0000
commit74f270a3177a43b29d98b6c5b6a2c5338be8b98f (patch)
treef07a9933508907612bc6d4af818447ff099a7c63 /loginutils/delline.c
parente5642119ee566520a098027746808dd6b9226d99 (diff)
downloadbusybox-74f270a3177a43b29d98b6c5b6a2c5338be8b98f.zip
busybox-74f270a3177a43b29d98b6c5b6a2c5338be8b98f.tar.gz
decouple delgroup and deluser
Diffstat (limited to 'loginutils/delline.c')
-rw-r--r--loginutils/delline.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/loginutils/delline.c b/loginutils/delline.c
new file mode 100644
index 0000000..ed29ca0
--- /dev/null
+++ b/loginutils/delline.c
@@ -0,0 +1,113 @@
+/* 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"
+
+
+
+/* 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;
+}
+
+
+/* $Id: delline.c,v 1.1 2003/07/14 20:20:45 andersen Exp $ */