| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * deluser (remove lusers from the system ;) for TinyLogin
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| 4 | *
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| 5 | * Copyright (C) 1999 by Lineo, inc. and John Beppu
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| 6 | * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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| 7 | * Unified with delgroup by Tito Ragusa <farmatito@tiscali.it>
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| 8 | *
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| 9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 10 | *
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| 11 | */
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| 12 |
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| 13 | #include <sys/stat.h>
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| 14 | #include <unistd.h>
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| 15 | #include <stdio.h>
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| 16 | #include <stdlib.h>
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| 17 | #include <string.h>
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| 18 | #include "busybox.h"
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| 19 |
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| 20 | /* where to start and stop deletion */
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| 21 | typedef struct {
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| 22 | size_t start;
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| 23 | size_t stop;
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| 24 | } Bounds;
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| 25 |
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| 26 | /* An interesting side-effect of boundary()'s
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| 27 | * implementation is that the first user (typically root)
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| 28 | * cannot be removed. Let's call it a feature. */
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| 29 | static inline Bounds boundary(const char *buffer, const char *login)
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| 30 | {
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| 31 | char needle[256];
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| 32 | char *start;
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| 33 | char *stop;
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| 34 | Bounds b;
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| 35 |
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| 36 | snprintf(needle, 256, "\n%s:", login);
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| 37 | needle[255] = 0;
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| 38 | start = strstr(buffer, needle);
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| 39 | if (!start) {
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| 40 | b.start = 0;
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| 41 | b.stop = 0;
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| 42 | return b;
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| 43 | }
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| 44 | start++;
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| 45 |
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| 46 | stop = strchr(start, '\n');
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| 47 | b.start = start - buffer;
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| 48 | b.stop = stop - buffer;
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| 49 | return b;
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| 50 | }
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| 51 |
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| 52 | /* grep -v ^login (except it only deletes the first match) */
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| 53 | /* ...in fact, I think I'm going to simplify this later */
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| 54 | static void del_line_matching(const char *login, const char *filename)
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| 55 | {
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| 56 | char *buffer;
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| 57 | FILE *passwd;
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| 58 | Bounds b;
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| 59 | struct stat statbuf;
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| 60 |
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| 61 |
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| 62 | if ((passwd = bb_wfopen(filename, "r"))) {
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| 63 | xstat(filename, &statbuf);
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| 64 | buffer = (char *) xmalloc(statbuf.st_size * sizeof(char));
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| 65 | fread(buffer, statbuf.st_size, sizeof(char), passwd);
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| 66 | fclose(passwd);
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| 67 | /* find the user to remove */
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| 68 | b = boundary(buffer, login);
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| 69 | if (b.stop != 0) {
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| 70 | /* write the file w/o the user */
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| 71 | if ((passwd = bb_wfopen(filename, "w"))) {
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| 72 | fwrite(buffer, (b.start - 1), sizeof(char), passwd);
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| 73 | fwrite(&buffer[b.stop], (statbuf.st_size - b.stop), sizeof(char), passwd);
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| 74 | fclose(passwd);
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| 75 | }
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| 76 | } else {
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| 77 | bb_error_msg("Can't find '%s' in '%s'", login, filename);
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| 78 | }
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| 79 | free(buffer);
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| 80 | }
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| 81 | }
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| 82 |
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| 83 | int deluser_main(int argc, char **argv)
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| 84 | {
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| 85 | if (argc != 2) {
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| 86 | bb_show_usage();
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| 87 | } else {
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| 88 | if (ENABLE_DELUSER && bb_applet_name[3] == 'u') {
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| 89 | del_line_matching(argv[1], bb_path_passwd_file);
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| 90 | if (ENABLE_FEATURE_SHADOWPASSWDS)
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| 91 | del_line_matching(argv[1], bb_path_shadow_file);
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| 92 | }
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| 93 | del_line_matching(argv[1], bb_path_group_file);
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| 94 | if (ENABLE_FEATURE_SHADOWPASSWDS)
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| 95 | del_line_matching(argv[1], bb_path_gshadow_file);
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| 96 | }
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| 97 | return (EXIT_SUCCESS);
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| 98 | }
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| 99 |
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| 100 | /* $Id: deluser.c,v 1.4 2003/07/14 20:20:45 andersen Exp $ */
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