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 <dirent.h> 55 #include <err.h> 56 #include <errno.h> 57 #include <langinfo.h> 58 #include <locale.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <time.h> 63 #include <timeconv.h> 64 #include <unistd.h> 65 66 #define NUSERS 1000 67 #define WHDRSIZE (ssize_t)(sizeof(wd) - sizeof(wd.wd_we)) 68 /* 69 * this macro should be shared with ruptime. 70 */ 71 #define down(w,now) ((now) - (w)->wd_recvtime > 11 * 60) 72 73 static DIR *dirp; 74 static struct whod wd; 75 static int nusers; 76 static struct myutmp { 77 char myhost[sizeof(wd.wd_hostname)]; 78 int myidle; 79 struct outmp myutmp; 80 } myutmp[NUSERS]; 81 82 static time_t now; 83 static int aflg; 84 85 static void usage(void); 86 static int utmpcmp(const void *, const void *); 87 88 int 89 main(int argc, char *argv[]) 90 { 91 int ch; 92 struct dirent *dp; 93 int width; 94 ssize_t cc; 95 struct whod *w; 96 struct whoent *we; 97 struct myutmp *mp; 98 cap_rights_t rights; 99 int f, n, i; 100 int d_first; 101 int dfd; 102 time_t ct; 103 104 w = &wd; 105 (void) setlocale(LC_TIME, ""); 106 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 107 108 while ((ch = getopt(argc, argv, "a")) != -1) { 109 switch ((char)ch) { 110 case 'a': 111 aflg = 1; 112 break; 113 case '?': 114 default: 115 usage(); 116 } 117 } 118 argc -= optind; 119 argv += optind; 120 121 if (argc != 0) 122 usage(); 123 124 if (chdir(_PATH_RWHODIR) < 0) 125 err(1, "chdir(%s)", _PATH_RWHODIR); 126 if ((dirp = opendir(".")) == NULL) 127 err(1, "opendir(%s)", _PATH_RWHODIR); 128 dfd = dirfd(dirp); 129 mp = myutmp; 130 cap_rights_init(&rights, CAP_READ, CAP_LOOKUP); 131 if (cap_rights_limit(dfd, &rights) < 0 && errno != ENOSYS) 132 err(1, "cap_rights_limit failed: %s", _PATH_RWHODIR); 133 /* 134 * Cache files required for time(3) and localtime(3) before entering 135 * capability mode. 136 */ 137 (void) time(&ct); 138 (void) localtime(&ct); 139 if (cap_enter() < 0 && errno != ENOSYS) 140 err(1, "cap_enter"); 141 (void) time(&now); 142 cap_rights_init(&rights, CAP_READ); 143 while ((dp = readdir(dirp)) != NULL) { 144 if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5) != 0) 145 continue; 146 f = openat(dfd, dp->d_name, O_RDONLY); 147 if (f < 0) 148 continue; 149 if (cap_rights_limit(f, &rights) < 0 && errno != ENOSYS) 150 err(1, "cap_rights_limit failed: %s", dp->d_name); 151 cc = read(f, (char *)&wd, sizeof(struct whod)); 152 if (cc < WHDRSIZE) { 153 (void) close(f); 154 continue; 155 } 156 if (down(w, now) != 0) { 157 (void) close(f); 158 continue; 159 } 160 cc -= WHDRSIZE; 161 we = w->wd_we; 162 for (n = cc / sizeof(struct whoent); n > 0; n--) { 163 if (aflg == 0 && we->we_idle >= 60 * 60) { 164 we++; 165 continue; 166 } 167 if (nusers >= NUSERS) 168 errx(1, "too many users"); 169 mp->myutmp = we->we_utmp; 170 mp->myidle = we->we_idle; 171 (void) strcpy(mp->myhost, w->wd_hostname); 172 nusers++; 173 we++; 174 mp++; 175 } 176 (void) close(f); 177 } 178 qsort((char *)myutmp, nusers, sizeof(struct myutmp), utmpcmp); 179 mp = myutmp; 180 width = 0; 181 for (i = 0; i < nusers; i++) { 182 /* append one for the blank and use 8 for the out_line */ 183 int j; 184 185 j = strlen(mp->myhost) + 1 + sizeof(mp->myutmp.out_line); 186 if (j > width) 187 width = j; 188 mp++; 189 } 190 mp = myutmp; 191 for (i = 0; i < nusers; i++) { 192 char buf[BUFSIZ], cbuf[80]; 193 time_t t; 194 195 t = _int_to_time(mp->myutmp.out_time); 196 strftime(cbuf, sizeof(cbuf), d_first ? "%e %b %R" : "%b %e %R", 197 localtime(&t)); 198 (void) sprintf(buf, "%s:%-.*s", mp->myhost, 199 (int)sizeof(mp->myutmp.out_line), mp->myutmp.out_line); 200 printf("%-*.*s %-*s %s", 201 (int)sizeof(mp->myutmp.out_name), 202 (int)sizeof(mp->myutmp.out_name), 203 mp->myutmp.out_name, width, buf, cbuf); 204 mp->myidle /= 60; 205 if (mp->myidle != 0) { 206 if (aflg != 0) { 207 if (mp->myidle >= 100 * 60) 208 mp->myidle = 100 * 60 - 1; 209 if (mp->myidle >= 60) 210 printf(" %2d", mp->myidle / 60); 211 else 212 printf(" "); 213 } else { 214 printf(" "); 215 } 216 printf(":%02d", mp->myidle % 60); 217 } 218 printf("\n"); 219 mp++; 220 } 221 exit(0); 222 } 223 224 225 static void 226 usage(void) 227 { 228 229 fprintf(stderr, "usage: rwho [-a]\n"); 230 exit(1); 231 } 232 233 #define MYUTMP(a) ((const struct myutmp *)(a)) 234 235 static int 236 utmpcmp(const void *u1, const void *u2) 237 { 238 int rc; 239 240 rc = strncmp(MYUTMP(u1)->myutmp.out_name, MYUTMP(u2)->myutmp.out_name, 241 sizeof(MYUTMP(u2)->myutmp.out_name)); 242 if (rc != 0) 243 return (rc); 244 rc = strcmp(MYUTMP(u1)->myhost, MYUTMP(u2)->myhost); 245 if (rc != 0) 246 return (rc); 247 return (strncmp(MYUTMP(u1)->myutmp.out_line, 248 MYUTMP(u2)->myutmp.out_line, sizeof(MYUTMP(u2)->myutmp.out_line))); 249 } 250