mirror of
https://github.com/sheumann/hush.git
synced 2024-10-30 11:29:19 +00:00
114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
/* 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 */
|
|
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 1.2 2003/07/14 21:50:51 andersen Exp $ */
|