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114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* deluser (remove lusers from the system ;) for TinyLogin
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*
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* Copyright (C) 1999 by Lineo, inc. and John Beppu
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* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "busybox.h"
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/* where to start and stop deletion */
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typedef struct {
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size_t start;
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size_t stop;
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} Bounds;
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/* An interesting side-effect of boundary()'s
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* implementation is that the first user (typically root)
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* cannot be removed. Let's call it a feature. */
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static inline Bounds boundary(const char *buffer, const char *login)
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{
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char needle[256];
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char *start;
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char *stop;
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Bounds b;
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snprintf(needle, 256, "\n%s:", login);
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needle[255] = 0;
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start = strstr(buffer, needle);
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if (!start) {
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b.start = 0;
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b.stop = 0;
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return b;
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}
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start++;
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stop = index(start, '\n'); /* index is a BSD-ism */
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b.start = start - buffer;
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b.stop = stop - buffer;
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return b;
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}
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/* grep -v ^login (except it only deletes the first match) */
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/* ...in fact, I think I'm going to simplify this later */
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int del_line_matching(const char *login, const char *filename)
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{
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char *buffer;
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FILE *passwd;
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size_t len;
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Bounds b;
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struct stat statbuf;
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/* load into buffer */
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passwd = fopen(filename, "r");
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if (!passwd) {
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return 1;
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}
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stat(filename, &statbuf);
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len = statbuf.st_size;
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buffer = (char *) malloc(len * sizeof(char));
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if (!buffer) {
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fclose(passwd);
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return 1;
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}
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fread(buffer, len, sizeof(char), passwd);
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fclose(passwd);
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/* find the user to remove */
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b = boundary(buffer, login);
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if (b.stop == 0) {
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free(buffer);
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return 1;
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}
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/* write the file w/o the user */
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passwd = fopen(filename, "w");
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if (!passwd) {
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return 1;
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}
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fwrite(buffer, (b.start - 1), sizeof(char), passwd);
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fwrite(&buffer[b.stop], (len - b.stop), sizeof(char), passwd);
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fclose(passwd);
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return 0;
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}
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/* $Id: delline.c,v 1.2 2003/07/14 21:50:51 andersen Exp $ */
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