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 <oshogbo@FreeBSD.org> 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 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 (caph_rights_limit(dfd, &rights) < 0) 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 (caph_rights_limit(f, &rights) < 0) 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 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 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