1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993 The Regents of the University of California.
5 * Copyright (c) 2013 Mariusz Zaborski <[email protected]>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 static const char copyright[] =
35 "@(#) Copyright (c) 1983, 1993\n\
36 The Regents of the University of California. All rights reserved.\n";
37 #endif /* not lint */
38
39 #ifndef lint
40 #if 0
41 static char sccsid[] = "@(#)rwho.c 8.1 (Berkeley) 6/6/93";
42 #endif
43 #endif /* not lint */
44
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
47
48 #include <sys/capsicum.h>
49 #include <sys/param.h>
50 #include <sys/file.h>
51
52 #include <protocols/rwhod.h>
53
54 #include <capsicum_helpers.h>
55 #include <dirent.h>
56 #include <err.h>
57 #include <errno.h>
58 #include <langinfo.h>
59 #include <locale.h>
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <string.h>
63 #include <time.h>
64 #include <timeconv.h>
65 #include <unistd.h>
66
67 #define NUSERS 1000
68 #define WHDRSIZE (ssize_t)(sizeof(wd) - sizeof(wd.wd_we))
69 /*
70 * this macro should be shared with ruptime.
71 */
72 #define down(w,now) ((now) - (w)->wd_recvtime > 11 * 60)
73
74 static DIR *dirp;
75 static struct whod wd;
76 static int nusers;
77 static struct myutmp {
78 char myhost[sizeof(wd.wd_hostname)];
79 int myidle;
80 struct outmp myutmp;
81 } myutmp[NUSERS];
82
83 static time_t now;
84 static int aflg;
85
86 static void usage(void);
87 static int utmpcmp(const void *, const void *);
88
89 int
main(int argc,char * argv[])90 main(int argc, char *argv[])
91 {
92 int ch;
93 struct dirent *dp;
94 int width;
95 ssize_t cc;
96 struct whod *w;
97 struct whoent *we;
98 struct myutmp *mp;
99 cap_rights_t rights;
100 int f, n, i;
101 int d_first;
102 int dfd;
103 time_t ct;
104
105 w = &wd;
106 (void) setlocale(LC_TIME, "");
107 d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
108
109 while ((ch = getopt(argc, argv, "a")) != -1) {
110 switch ((char)ch) {
111 case 'a':
112 aflg = 1;
113 break;
114 case '?':
115 default:
116 usage();
117 }
118 }
119 argc -= optind;
120 argv += optind;
121
122 if (argc != 0)
123 usage();
124
125 if (chdir(_PATH_RWHODIR) < 0)
126 err(1, "chdir(%s)", _PATH_RWHODIR);
127 if ((dirp = opendir(".")) == NULL)
128 err(1, "opendir(%s)", _PATH_RWHODIR);
129 dfd = dirfd(dirp);
130 mp = myutmp;
131 cap_rights_init(&rights, CAP_READ, CAP_LOOKUP);
132 if (cap_rights_limit(dfd, &rights) < 0 && errno != ENOSYS)
133 err(1, "cap_rights_limit failed: %s", _PATH_RWHODIR);
134 /*
135 * Cache files required for time(3) and localtime(3) before entering
136 * capability mode.
137 */
138 (void) time(&ct);
139 (void) localtime(&ct);
140 if (caph_enter() < 0)
141 err(1, "cap_enter");
142 (void) time(&now);
143 cap_rights_init(&rights, CAP_READ);
144 while ((dp = readdir(dirp)) != NULL) {
145 if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5) != 0)
146 continue;
147 f = openat(dfd, dp->d_name, O_RDONLY);
148 if (f < 0)
149 continue;
150 if (cap_rights_limit(f, &rights) < 0 && errno != ENOSYS)
151 err(1, "cap_rights_limit failed: %s", dp->d_name);
152 cc = read(f, (char *)&wd, sizeof(struct whod));
153 if (cc < WHDRSIZE) {
154 (void) close(f);
155 continue;
156 }
157 if (down(w, now) != 0) {
158 (void) close(f);
159 continue;
160 }
161 cc -= WHDRSIZE;
162 we = w->wd_we;
163 for (n = cc / sizeof(struct whoent); n > 0; n--) {
164 if (aflg == 0 && we->we_idle >= 60 * 60) {
165 we++;
166 continue;
167 }
168 if (nusers >= NUSERS)
169 errx(1, "too many users");
170 mp->myutmp = we->we_utmp;
171 mp->myidle = we->we_idle;
172 (void) strcpy(mp->myhost, w->wd_hostname);
173 nusers++;
174 we++;
175 mp++;
176 }
177 (void) close(f);
178 }
179 qsort((char *)myutmp, nusers, sizeof(struct myutmp), utmpcmp);
180 mp = myutmp;
181 width = 0;
182 for (i = 0; i < nusers; i++) {
183 /* append one for the blank and use 8 for the out_line */
184 int j;
185
186 j = strlen(mp->myhost) + 1 + sizeof(mp->myutmp.out_line);
187 if (j > width)
188 width = j;
189 mp++;
190 }
191 mp = myutmp;
192 for (i = 0; i < nusers; i++) {
193 char buf[BUFSIZ], cbuf[80];
194 time_t t;
195
196 t = _int_to_time(mp->myutmp.out_time);
197 strftime(cbuf, sizeof(cbuf), d_first ? "%e %b %R" : "%b %e %R",
198 localtime(&t));
199 (void) sprintf(buf, "%s:%-.*s", mp->myhost,
200 (int)sizeof(mp->myutmp.out_line), mp->myutmp.out_line);
201 printf("%-*.*s %-*s %s",
202 (int)sizeof(mp->myutmp.out_name),
203 (int)sizeof(mp->myutmp.out_name),
204 mp->myutmp.out_name, width, buf, cbuf);
205 mp->myidle /= 60;
206 if (mp->myidle != 0) {
207 if (aflg != 0) {
208 if (mp->myidle >= 100 * 60)
209 mp->myidle = 100 * 60 - 1;
210 if (mp->myidle >= 60)
211 printf(" %2d", mp->myidle / 60);
212 else
213 printf(" ");
214 } else {
215 printf(" ");
216 }
217 printf(":%02d", mp->myidle % 60);
218 }
219 printf("\n");
220 mp++;
221 }
222 exit(0);
223 }
224
225
226 static void
usage(void)227 usage(void)
228 {
229
230 fprintf(stderr, "usage: rwho [-a]\n");
231 exit(1);
232 }
233
234 #define MYUTMP(a) ((const struct myutmp *)(a))
235
236 static int
utmpcmp(const void * u1,const void * u2)237 utmpcmp(const void *u1, const void *u2)
238 {
239 int rc;
240
241 rc = strncmp(MYUTMP(u1)->myutmp.out_name, MYUTMP(u2)->myutmp.out_name,
242 sizeof(MYUTMP(u2)->myutmp.out_name));
243 if (rc != 0)
244 return (rc);
245 rc = strcmp(MYUTMP(u1)->myhost, MYUTMP(u2)->myhost);
246 if (rc != 0)
247 return (rc);
248 return (strncmp(MYUTMP(u1)->myutmp.out_line,
249 MYUTMP(u2)->myutmp.out_line, sizeof(MYUTMP(u2)->myutmp.out_line)));
250 }
251