Annotation of src/usr.bin/who/who.c, Revision 1.28
1.28 ! deraadt 1: /* $OpenBSD: who.c,v 1.27 2015/10/21 16:06:57 millert Exp $ */
1.1 deraadt 2: /* $NetBSD: who.c,v 1.4 1994/12/07 04:28:49 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1989, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Michael Fischbein.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.15 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #include <sys/types.h>
37: #include <sys/stat.h>
1.9 millert 38: #include <paths.h>
1.1 deraadt 39: #include <pwd.h>
40: #include <utmp.h>
41: #include <stdio.h>
42: #include <string.h>
43: #include <stdlib.h>
44: #include <unistd.h>
45: #include <time.h>
46: #include <err.h>
1.5 flipk 47: #include <locale.h>
48:
1.12 millert 49: void output(struct utmp *);
50: void output_labels(void);
51: void who_am_i(FILE *);
52: void usage(void);
53: FILE *file(char *);
1.1 deraadt 54:
55: int only_current_term; /* show info about the current terminal only */
56: int show_term; /* show term state */
57: int show_idle; /* show idle time */
1.5 flipk 58: int show_labels; /* show column labels */
1.6 denny 59: int show_quick; /* quick, names only */
1.1 deraadt 60:
1.10 deraadt 61: #define NAME_WIDTH 8
1.19 otto 62: #define HOST_WIDTH 45
63:
64: int hostwidth = HOST_WIDTH;
1.21 semarie 65: char *mytty;
1.10 deraadt 66:
1.1 deraadt 67: int
1.16 deraadt 68: main(int argc, char *argv[])
1.1 deraadt 69: {
70: struct utmp usr;
1.5 flipk 71: FILE *ufp;
1.21 semarie 72: char *t;
1.1 deraadt 73: int c;
74:
1.5 flipk 75: setlocale(LC_ALL, "");
76:
1.28 ! deraadt 77: if (pledge("stdio unveil rpath getpw", NULL) == -1)
1.23 deraadt 78: err(1, "pledge");
1.21 semarie 79:
1.27 millert 80: if ((mytty = ttyname(0))) {
1.25 deraadt 81: /* strip any directory component */
82: if ((t = strrchr(mytty, '/')))
83: mytty = t + 1;
84: }
1.21 semarie 85:
1.5 flipk 86: only_current_term = show_term = show_idle = show_labels = 0;
1.6 denny 87: show_quick = 0;
88: while ((c = getopt(argc, argv, "HmqTu")) != -1) {
1.1 deraadt 89: switch (c) {
1.6 denny 90: case 'H':
91: show_labels = 1;
92: break;
1.1 deraadt 93: case 'm':
94: only_current_term = 1;
95: break;
1.6 denny 96: case 'q':
97: show_quick = 1;
98: break;
1.1 deraadt 99: case 'T':
100: show_term = 1;
101: break;
102: case 'u':
103: show_idle = 1;
104: break;
105: default:
106: usage();
107: /* NOTREACHED */
108: }
109: }
110: argc -= optind;
111: argv += optind;
112:
1.6 denny 113: if (show_quick) {
114: only_current_term = show_term = show_idle = show_labels = 0;
115: }
1.19 otto 116:
117: if (show_term)
118: hostwidth -= 2;
119: if (show_idle)
120: hostwidth -= 6;
1.6 denny 121:
1.5 flipk 122: if (show_labels)
123: output_labels();
124:
1.28 ! deraadt 125: if (unveil(_PATH_UTMP, "r") == -1)
! 126: err(1, "unveil");
1.1 deraadt 127: switch (argc) {
128: case 0: /* who */
1.28 ! deraadt 129: if (pledge("stdio rpath getpw", NULL) == -1)
! 130: err(1, "pledge");
1.1 deraadt 131: ufp = file(_PATH_UTMP);
132:
133: if (only_current_term) {
134: who_am_i(ufp);
1.6 denny 135: } else if (show_quick) {
136: int count = 0;
137:
138: while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) {
139: if (*usr.ut_name && *usr.ut_line) {
1.10 deraadt 140: (void)printf("%-*.*s ", NAME_WIDTH,
1.6 denny 141: UT_NAMESIZE, usr.ut_name);
142: if ((++count % 8) == 0)
143: (void) printf("\n");
144: }
145: }
146: if (count % 8)
147: (void) printf("\n");
148: (void) printf ("# users=%d\n", count);
1.1 deraadt 149: } else {
150: /* only entries with both name and line fields */
151: while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
152: if (*usr.ut_name && *usr.ut_line)
153: output(&usr);
154: }
155: break;
156: case 1: /* who utmp_file */
1.28 ! deraadt 157: if (unveil(*argv, "r") == -1)
! 158: err(1, "unveil");
! 159: if (pledge("stdio rpath getpw", NULL) == -1)
! 160: err(1, "pledge");
1.1 deraadt 161: ufp = file(*argv);
162:
163: if (only_current_term) {
164: who_am_i(ufp);
1.6 denny 165: } else if (show_quick) {
166: int count = 0;
167:
168: while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) {
169: if (*usr.ut_name && *usr.ut_line) {
1.10 deraadt 170: (void)printf("%-*.*s ", NAME_WIDTH,
1.6 denny 171: UT_NAMESIZE, usr.ut_name);
172: if ((++count % 8) == 0)
173: (void) printf("\n");
174: }
175: }
176: if (count % 8)
177: (void) printf("\n");
178: (void) printf ("# users=%d\n", count);
1.1 deraadt 179: } else {
180: /* all entries */
181: while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
182: output(&usr);
183: }
184: break;
185: case 2: /* who am i */
1.28 ! deraadt 186: if (pledge("stdio rpath getpw", NULL) == -1)
! 187: err(1, "pledge");
1.1 deraadt 188: ufp = file(_PATH_UTMP);
189: who_am_i(ufp);
190: break;
191: default:
192: usage();
193: /* NOTREACHED */
194: }
195: exit(0);
196: }
197:
198: void
1.16 deraadt 199: who_am_i(FILE *ufp)
1.1 deraadt 200: {
201: struct utmp usr;
202: struct passwd *pw;
203:
204: /* search through the utmp and find an entry for this tty */
1.21 semarie 205: if (mytty) {
1.1 deraadt 206: while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
1.21 semarie 207: if (*usr.ut_name && !strcmp(usr.ut_line, mytty)) {
1.1 deraadt 208: output(&usr);
209: return;
210: }
211: /* well, at least we know what the tty is */
1.21 semarie 212: (void)strncpy(usr.ut_line, mytty, UT_LINESIZE);
1.1 deraadt 213: } else
1.13 deraadt 214: (void)strncpy(usr.ut_line, "tty??", UT_LINESIZE);
1.1 deraadt 215:
216: pw = getpwuid(getuid());
217: (void)strncpy(usr.ut_name, pw ? pw->pw_name : "?", UT_NAMESIZE);
218: (void)time(&usr.ut_time);
219: *usr.ut_host = '\0';
220: output(&usr);
221: }
222:
223: void
1.16 deraadt 224: output(struct utmp *up)
1.1 deraadt 225: {
226: struct stat sb;
1.9 millert 227: char line[sizeof(_PATH_DEV) + sizeof (up->ut_line)];
1.5 flipk 228: char state = '?';
1.1 deraadt 229: static time_t now = 0;
1.5 flipk 230: time_t idle = 0;
1.1 deraadt 231:
232: if (show_term || show_idle) {
233: if (now == 0)
234: time(&now);
235:
1.14 deraadt 236: memset(line, 0, sizeof line);
237: strlcpy(line, _PATH_DEV, sizeof line);
238: strlcat(line, up->ut_line, sizeof line);
1.1 deraadt 239:
240: if (stat(line, &sb) == 0) {
241: state = (sb.st_mode & 020) ? '+' : '-';
242: idle = now - sb.st_atime;
243: } else {
244: state = '?';
245: idle = 0;
246: }
247:
248: }
249:
1.10 deraadt 250: (void)printf("%-*.*s ", NAME_WIDTH, UT_NAMESIZE, up->ut_name);
1.1 deraadt 251:
252: if (show_term) {
253: (void)printf("%c ", state);
254: }
255:
256: (void)printf("%-*.*s ", UT_LINESIZE, UT_LINESIZE, up->ut_line);
257: (void)printf("%.12s ", ctime(&up->ut_time) + 4);
258:
259: if (show_idle) {
260: if (idle < 60)
261: (void)printf(" . ");
262: else if (idle < (24 * 60 * 60))
263: (void)printf("%02d:%02d ",
1.20 guenther 264: ((int)idle / (60 * 60)),
265: ((int)idle % (60 * 60)) / 60);
1.1 deraadt 266: else
267: (void)printf(" old ");
268: }
269:
270: if (*up->ut_host)
1.19 otto 271: printf(" (%.*s)", hostwidth, up->ut_host);
1.1 deraadt 272: (void)putchar('\n');
273: }
274:
1.5 flipk 275: void
1.16 deraadt 276: output_labels(void)
1.5 flipk 277: {
1.10 deraadt 278: (void)printf("%-*.*s ", NAME_WIDTH, UT_NAMESIZE, "USER");
1.5 flipk 279:
280: if (show_term)
281: (void)printf("S ");
282:
283: (void)printf("%-*.*s ", UT_LINESIZE, UT_LINESIZE, "LINE");
284: (void)printf("WHEN ");
285:
286: if (show_idle)
287: (void)printf("IDLE ");
288:
1.19 otto 289: (void)printf(" %.*s", hostwidth, "FROM");
1.5 flipk 290:
291: (void)putchar('\n');
292: }
293:
1.1 deraadt 294: FILE *
1.16 deraadt 295: file(char *name)
1.1 deraadt 296: {
297: FILE *ufp;
298:
299: if (!(ufp = fopen(name, "r"))) {
300: err(1, "%s", name);
301: /* NOTREACHED */
1.21 semarie 302: }
303: if (show_term || show_idle) {
1.24 deraadt 304: if (pledge("stdio rpath getpw", NULL) == -1)
1.23 deraadt 305: err(1, "pledge");
1.21 semarie 306: } else {
1.23 deraadt 307: if (pledge("stdio getpw", NULL) == -1)
308: err(1, "pledge");
1.1 deraadt 309: }
310: return(ufp);
311: }
312:
313: void
1.16 deraadt 314: usage(void)
1.1 deraadt 315: {
1.17 jmc 316: (void)fprintf(stderr, "usage: who [-HmqTu] [file]\n who am i\n");
1.1 deraadt 317: exit(1);
318: }
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