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Diffstat (limited to 'deluser.c')
| -rw-r--r-- | deluser.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/deluser.c b/deluser.c new file mode 100644 index 0000000..bb6e109 --- /dev/null +++ b/deluser.c @@ -0,0 +1,175 @@ +/* vi: set sw=4 ts=4: */ +/* + * deluser (remove lusers from the system ;) for TinyLogin + * + * + * Copyright (C) 1999 by Lineo, inc. + * Written by John Beppu <beppu@lineo.com> + * + * 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" + +/* 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 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(char *login, 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 TLG_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 /* TLG_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 TLG_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); + } +#endif /* TLG_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 2001/08/21 16:18:59 andersen Exp $ */ |