| 1 | /*- |
| 2 | * Copyright (c) 2002 Tim J. Robbins. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 24 | * SUCH DAMAGE. |
| 25 | * |
| 26 | * $FreeBSD: src/usr.bin/who/who.c,v 1.9.2.4 2002/12/21 00:44:58 tjr Exp $ |
| 27 | * $DragonFly: src/usr.bin/who/who.c,v 1.7 2008/06/05 18:06:33 swildner Exp $ |
| 28 | */ |
| 29 | |
| 30 | #include <sys/types.h> |
| 31 | #include <sys/ioctl.h> |
| 32 | #include <sys/stat.h> |
| 33 | #include <sys/sysctl.h> |
| 34 | |
| 35 | #include <err.h> |
| 36 | #include <errno.h> |
| 37 | #include <langinfo.h> |
| 38 | #include <limits.h> |
| 39 | #include <locale.h> |
| 40 | #include <paths.h> |
| 41 | #include <pwd.h> |
| 42 | #include <stdio.h> |
| 43 | #include <stdlib.h> |
| 44 | #include <string.h> |
| 45 | #include <time.h> |
| 46 | #include <unistd.h> |
| 47 | #include <utmp.h> |
| 48 | |
| 49 | static void print_boottime(void); |
| 50 | static void heading(void); |
| 51 | static void process_utmp(FILE *); |
| 52 | static void quick(FILE *); |
| 53 | static void row(struct utmp *); |
| 54 | static int ttywidth(void); |
| 55 | static void usage(void); |
| 56 | static void whoami(FILE *); |
| 57 | |
| 58 | static int bflag; /* Show date and time of last reboot */ |
| 59 | static int Hflag; /* Write column headings */ |
| 60 | static int mflag; /* Show info about current terminal */ |
| 61 | static int qflag; /* "Quick" mode */ |
| 62 | static int sflag; /* Show name, line, time */ |
| 63 | static int Tflag; /* Show terminal state */ |
| 64 | static int uflag; /* Show idle time */ |
| 65 | |
| 66 | int |
| 67 | main(int argc, char **argv) |
| 68 | { |
| 69 | int ch; |
| 70 | const char *file; |
| 71 | FILE *fp; |
| 72 | |
| 73 | setlocale(LC_TIME, ""); |
| 74 | |
| 75 | while ((ch = getopt(argc, argv, "HTbmqsu")) != -1) { |
| 76 | switch (ch) { |
| 77 | case 'H': /* Write column headings */ |
| 78 | Hflag = 1; |
| 79 | break; |
| 80 | case 'T': /* Show terminal state */ |
| 81 | Tflag = 1; |
| 82 | break; |
| 83 | case 'b': /* Show time and date since last boot */ |
| 84 | bflag = 1; |
| 85 | break; |
| 86 | case 'm': /* Show info about current terminal */ |
| 87 | mflag = 1; |
| 88 | break; |
| 89 | case 'q': /* "Quick" mode */ |
| 90 | qflag = 1; |
| 91 | break; |
| 92 | case 's': /* Show name, line, time */ |
| 93 | sflag = 1; |
| 94 | break; |
| 95 | case 'u': /* Show idle time */ |
| 96 | uflag = 1; |
| 97 | break; |
| 98 | default: |
| 99 | usage(); |
| 100 | /*NOTREACHED*/ |
| 101 | } |
| 102 | } |
| 103 | argc -= optind; |
| 104 | argv += optind; |
| 105 | |
| 106 | if (argc >= 2 && strcmp(argv[0], "am") == 0 && |
| 107 | strcasecmp(argv[1], "i") == 0) { |
| 108 | /* "who am i" or "who am I", equivalent to -m */ |
| 109 | mflag = 1; |
| 110 | argc -= 2; |
| 111 | argv += 2; |
| 112 | } |
| 113 | if (argc > 1) |
| 114 | usage(); |
| 115 | |
| 116 | if (*argv != NULL) |
| 117 | file = *argv; |
| 118 | else |
| 119 | file = _PATH_UTMP; |
| 120 | if ((fp = fopen(file, "r")) == NULL) |
| 121 | err(1, "%s", file); |
| 122 | |
| 123 | if (qflag) |
| 124 | quick(fp); |
| 125 | else { |
| 126 | if (sflag) |
| 127 | Tflag = uflag = 0; |
| 128 | if (bflag) |
| 129 | print_boottime(); |
| 130 | if (Hflag) |
| 131 | heading(); |
| 132 | if (mflag) |
| 133 | whoami(fp); |
| 134 | else |
| 135 | process_utmp(fp); |
| 136 | } |
| 137 | |
| 138 | fclose(fp); |
| 139 | |
| 140 | exit(0); |
| 141 | } |
| 142 | |
| 143 | static void |
| 144 | usage(void) |
| 145 | { |
| 146 | fprintf(stderr, "usage: who [-bHmqsTu] [am I] [file]\n"); |
| 147 | exit(1); |
| 148 | } |
| 149 | |
| 150 | static void |
| 151 | print_boottime(void) |
| 152 | { |
| 153 | struct timeval boottime; |
| 154 | size_t size; |
| 155 | |
| 156 | size = sizeof(boottime); |
| 157 | if (sysctlbyname("kern.boottime", &boottime, &size, NULL, 0) != -1 && |
| 158 | boottime.tv_sec != 0) { |
| 159 | printf("%s", ctime(&boottime.tv_sec)); |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | static void |
| 164 | heading(void) |
| 165 | { |
| 166 | printf("%-*s ", UT_NAMESIZE, "NAME"); |
| 167 | if (Tflag) |
| 168 | printf("S "); |
| 169 | printf("%-*s ", UT_LINESIZE, "LINE"); |
| 170 | printf("%-*s ", 12, "TIME"); |
| 171 | if (uflag) |
| 172 | printf("IDLE "); |
| 173 | printf("%-*s", UT_HOSTSIZE, "FROM"); |
| 174 | putchar('\n'); |
| 175 | } |
| 176 | |
| 177 | static void |
| 178 | row(struct utmp *ut) |
| 179 | { |
| 180 | char buf[80], tty[sizeof(_PATH_DEV) + UT_LINESIZE]; |
| 181 | struct stat sb; |
| 182 | time_t idle = 0; |
| 183 | static int d_first = -1; |
| 184 | struct tm *tm; |
| 185 | char state = '?'; |
| 186 | |
| 187 | if (d_first < 0) |
| 188 | d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); |
| 189 | |
| 190 | if (Tflag || uflag) { |
| 191 | snprintf(tty, sizeof(tty), "%s%.*s", _PATH_DEV, |
| 192 | UT_LINESIZE, ut->ut_line); |
| 193 | if (stat(tty, &sb) == 0) { |
| 194 | state = sb.st_mode & (S_IWOTH|S_IWGRP) ? |
| 195 | '+' : '-'; |
| 196 | idle = time(NULL) - sb.st_mtime; |
| 197 | } else { |
| 198 | err(1, "Cannot open %s", tty); |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | printf("%-*.*s ", UT_NAMESIZE, UT_NAMESIZE, ut->ut_name); |
| 203 | if (Tflag) |
| 204 | printf("%c ", state); |
| 205 | printf("%-*.*s ", UT_LINESIZE, UT_LINESIZE, ut->ut_line); |
| 206 | tm = localtime(&ut->ut_time); |
| 207 | strftime(buf, sizeof(buf), d_first ? "%e %b %R" : "%b %e %R", tm); |
| 208 | printf("%-*s ", 12, buf); |
| 209 | if (uflag) { |
| 210 | if (idle < 60) |
| 211 | printf(" . "); |
| 212 | else if (idle < 24 * 60 * 60) |
| 213 | printf("%02d:%02d ", (int)(idle / 60 / 60), |
| 214 | (int)(idle / 60 % 60)); |
| 215 | else |
| 216 | printf(" old "); |
| 217 | } |
| 218 | if (*ut->ut_host != '\0') |
| 219 | printf("(%.*s)", UT_HOSTSIZE, ut->ut_host); |
| 220 | putchar('\n'); |
| 221 | } |
| 222 | |
| 223 | static void |
| 224 | process_utmp(FILE *fp) |
| 225 | { |
| 226 | struct utmp ut; |
| 227 | |
| 228 | while (fread(&ut, sizeof(ut), 1, fp) == 1) |
| 229 | if (*ut.ut_name != '\0') |
| 230 | row(&ut); |
| 231 | } |
| 232 | |
| 233 | static void |
| 234 | quick(FILE *fp) |
| 235 | { |
| 236 | struct utmp ut; |
| 237 | int col, ncols, num; |
| 238 | |
| 239 | ncols = ttywidth(); |
| 240 | col = num = 0; |
| 241 | while (fread(&ut, sizeof(ut), 1, fp) == 1) { |
| 242 | if (*ut.ut_name == '\0') |
| 243 | continue; |
| 244 | printf("%-*.*s", UT_NAMESIZE, UT_NAMESIZE, ut.ut_name); |
| 245 | if (++col < ncols / (UT_NAMESIZE + 1)) |
| 246 | putchar(' '); |
| 247 | else { |
| 248 | col = 0; |
| 249 | putchar('\n'); |
| 250 | } |
| 251 | num++; |
| 252 | } |
| 253 | if (col != 0) |
| 254 | putchar('\n'); |
| 255 | |
| 256 | printf("# users = %d\n", num); |
| 257 | } |
| 258 | |
| 259 | static void |
| 260 | whoami(FILE *fp) |
| 261 | { |
| 262 | struct utmp ut; |
| 263 | struct passwd *pwd; |
| 264 | const char *name, *p, *tty; |
| 265 | |
| 266 | if ((tty = ttyname(STDIN_FILENO)) == NULL) |
| 267 | tty = "tty??"; |
| 268 | else if ((p = strrchr(tty, '/')) != NULL) |
| 269 | tty = p + 1; |
| 270 | |
| 271 | /* Search utmp for our tty, dump first matching record. */ |
| 272 | while (fread(&ut, sizeof(ut), 1, fp) == 1) |
| 273 | if (*ut.ut_name != '\0' && strncmp(ut.ut_line, tty, |
| 274 | UT_LINESIZE) == 0) { |
| 275 | row(&ut); |
| 276 | return; |
| 277 | } |
| 278 | |
| 279 | /* Not found; fill the utmp structure with the information we have. */ |
| 280 | memset(&ut, 0, sizeof(ut)); |
| 281 | if ((pwd = getpwuid(getuid())) != NULL) |
| 282 | name = pwd->pw_name; |
| 283 | else |
| 284 | name = "?"; |
| 285 | strncpy(ut.ut_name, name, UT_NAMESIZE); |
| 286 | strncpy(ut.ut_line, tty, UT_LINESIZE); |
| 287 | time(&ut.ut_time); |
| 288 | row(&ut); |
| 289 | } |
| 290 | |
| 291 | static int |
| 292 | ttywidth(void) |
| 293 | { |
| 294 | struct winsize ws; |
| 295 | long width; |
| 296 | char *cols, *ep; |
| 297 | |
| 298 | if ((cols = getenv("COLUMNS")) != NULL && *cols != '\0') { |
| 299 | errno = 0; |
| 300 | width = strtol(cols, &ep, 10); |
| 301 | if (errno || width <= 0 || width > INT_MAX || ep == cols || |
| 302 | *ep != '\0') |
| 303 | warnx("invalid COLUMNS environment variable ignored"); |
| 304 | else |
| 305 | return (width); |
| 306 | } |
| 307 | if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) |
| 308 | return (ws.ws_col); |
| 309 | |
| 310 | return (80); |
| 311 | } |