Annotation of src/usr.bin/w/w.c, Revision 1.67
1.67 ! deraadt 1: /* $OpenBSD: w.c,v 1.66 2019/06/28 13:35:05 deraadt Exp $ */
1.4 deraadt 2:
1.1 deraadt 3: /*-
4: * Copyright (c) 1980, 1991, 1993, 1994
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
1.39 millert 15: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
32: /*
33: * w - print system status (who and what)
34: *
35: * This program is similar to the systat command on Tenex/Tops 10/20
36: *
37: */
38: #include <sys/time.h>
39: #include <sys/stat.h>
40: #include <sys/sysctl.h>
1.57 deraadt 41: #include <sys/signal.h>
1.1 deraadt 42: #include <sys/proc.h>
43: #include <sys/ioctl.h>
44: #include <sys/socket.h>
45: #include <sys/tty.h>
46:
47: #include <netinet/in.h>
48: #include <arpa/inet.h>
49:
50: #include <ctype.h>
51: #include <err.h>
52: #include <errno.h>
53: #include <fcntl.h>
54: #include <kvm.h>
55: #include <netdb.h>
56: #include <nlist.h>
57: #include <paths.h>
58: #include <stdio.h>
59: #include <stdlib.h>
60: #include <string.h>
61: #include <unistd.h>
1.5 deraadt 62: #include <limits.h>
1.1 deraadt 63: #include <utmp.h>
64: #include <vis.h>
65:
66: #include "extern.h"
67:
68: struct utmp utmp;
69: struct winsize ws;
70: kvm_t *kd;
71: time_t now; /* the current time of day */
72: int ttywidth; /* width of tty */
73: int argwidth; /* width of tty */
74: int header = 1; /* true if -h flag: don't print heading */
1.6 deraadt 75: int nflag = 1; /* true if -n flag: don't convert addrs */
1.49 jasper 76: int sortidle; /* sort by idle time */
1.1 deraadt 77: char *sel_user; /* login of particular user selected */
1.57 deraadt 78: char domain[HOST_NAME_MAX+1];
1.1 deraadt 79:
1.32 deraadt 80: #define NAME_WIDTH 8
81: #define HOST_WIDTH 16
82:
1.1 deraadt 83: /*
84: * One of these per active utmp entry.
85: */
86: struct entry {
87: struct entry *next;
88: struct utmp utmp;
1.41 millert 89: dev_t tdev; /* dev_t of terminal */
90: time_t idle; /* idle time of terminal in seconds */
1.48 guenther 91: struct kinfo_proc *kp; /* `most interesting' proc */
1.1 deraadt 92: } *ep, *ehead = NULL, **nextp = &ehead;
93:
1.62 schwarze 94: static void fmt_putc(int, int *);
95: static void fmt_puts(const char *, int *);
1.48 guenther 96: static void pr_args(struct kinfo_proc *);
1.35 millert 97: static void pr_header(time_t *, int);
1.1 deraadt 98: static struct stat
1.35 millert 99: *ttystat(char *);
100: static void usage(int);
1.1 deraadt 101:
102: int
1.38 deraadt 103: main(int argc, char *argv[])
1.1 deraadt 104: {
105: extern char *__progname;
1.48 guenther 106: struct kinfo_proc *kp;
1.1 deraadt 107: struct hostent *hp;
108: struct stat *stp;
109: FILE *ut;
1.27 deraadt 110: struct in_addr addr;
1.1 deraadt 111: int ch, i, nentries, nusers, wcmd;
112: char *memf, *nlistf, *p, *x;
1.57 deraadt 113: char buf[HOST_NAME_MAX+1], errbuf[_POSIX2_LINE_MAX];
1.60 deraadt 114:
1.1 deraadt 115: /* Are we w(1) or uptime(1)? */
116: p = __progname;
117: if (*p == '-')
118: p++;
1.19 mickey 119: if (p[0] == 'w' && p[1] == '\0') {
120: wcmd = 1;
121: p = "hiflM:N:asuw";
122: } else if (!strcmp(p, "uptime")) {
1.1 deraadt 123: wcmd = 0;
1.45 jaredy 124: p = "";
1.19 mickey 125: } else
1.20 kstailey 126: errx(1,
127: "this program should be invoked only as \"w\" or \"uptime\"");
1.1 deraadt 128:
129: memf = nlistf = NULL;
1.12 millert 130: while ((ch = getopt(argc, argv, p)) != -1)
1.1 deraadt 131: switch (ch) {
132: case 'h':
133: header = 0;
134: break;
135: case 'i':
136: sortidle = 1;
137: break;
138: case 'M':
139: header = 0;
140: memf = optarg;
141: break;
142: case 'N':
143: nlistf = optarg;
144: break;
1.6 deraadt 145: case 'a':
146: nflag = 0;
1.1 deraadt 147: break;
148: case 'f': case 'l': case 's': case 'u': case 'w':
149: warnx("[-flsuw] no longer supported");
150: /* FALLTHROUGH */
151: case '?':
152: default:
153: usage(wcmd);
154: }
155: argc -= optind;
156: argv += optind;
1.61 deraadt 157:
158: if (nflag == 0) {
159: if (pledge("stdio tty rpath dns ps vminfo", NULL) == -1)
160: err(1, "pledge");
161: } else {
162: if (pledge("stdio tty rpath ps vminfo", NULL) == -1)
163: err(1, "pledge");
164: }
1.1 deraadt 165:
1.37 angelos 166: if (nlistf == NULL && memf == NULL) {
1.38 deraadt 167: if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES,
168: errbuf)) == NULL)
1.37 angelos 169: errx(1, "%s", errbuf);
170: } else {
171: if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
172: errx(1, "%s", errbuf);
1.11 tholo 173: }
1.1 deraadt 174:
175: (void)time(&now);
176: if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
177: err(1, "%s", _PATH_UTMP);
178:
179: if (*argv)
180: sel_user = *argv;
181:
182: for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
183: if (utmp.ut_name[0] == '\0')
184: continue;
185: ++nusers;
186: if (wcmd == 0 || (sel_user &&
187: strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
188: continue;
1.33 smart 189: if ((ep = calloc(1, sizeof(*ep))) == NULL)
1.1 deraadt 190: err(1, NULL);
191: *nextp = ep;
192: nextp = &(ep->next);
1.33 smart 193: memcpy(&(ep->utmp), &utmp, sizeof(utmp));
1.1 deraadt 194: if (!(stp = ttystat(ep->utmp.ut_line)))
195: continue;
196: ep->tdev = stp->st_rdev;
1.50 kettenis 197:
1.1 deraadt 198: /*
199: * If this is the console device, attempt to ascertain
200: * the true console device dev_t.
201: */
202: if (ep->tdev == 0) {
203: int mib[2];
204: size_t size;
205:
1.50 kettenis 206: mib[0] = CTL_KERN;
207: mib[1] = KERN_CONSDEV;
1.1 deraadt 208: size = sizeof(dev_t);
209: (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
210: }
1.50 kettenis 211:
1.1 deraadt 212: if ((ep->idle = now - stp->st_atime) < 0)
213: ep->idle = 0;
214: }
215: (void)fclose(ut);
216:
217: if (header || wcmd == 0) {
218: pr_header(&now, nusers);
219: if (wcmd == 0)
220: exit (0);
221: }
222:
1.30 deraadt 223: #define HEADER "USER TTY FROM LOGIN@ IDLE WHAT"
1.33 smart 224: #define WUSED (sizeof(HEADER) - sizeof("WHAT"))
1.64 jasper 225: if (header)
226: (void)puts(HEADER);
1.1 deraadt 227:
1.48 guenther 228: kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries);
1.41 millert 229: if (kp == NULL)
1.2 deraadt 230: errx(1, "%s", kvm_geterr(kd));
1.59 deraadt 231:
232: if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
233: ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
234: ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
235: ttywidth = 79;
236: else
237: ttywidth = ws.ws_col - 1;
238: argwidth = ttywidth - WUSED;
239: if (argwidth < 4)
240: argwidth = 8;
241:
1.1 deraadt 242: for (i = 0; i < nentries; i++, kp++) {
1.55 guenther 243: if (kp->p_psflags & (PS_EMBRYO | PS_ZOMBIE))
1.1 deraadt 244: continue;
245: for (ep = ehead; ep != NULL; ep = ep->next) {
1.7 downsj 246: /* ftp is a special case. */
247: if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) {
1.26 millert 248: char pidstr[UT_LINESIZE-2];
249: pid_t fp;
250:
251: (void)strncpy(pidstr, &ep->utmp.ut_line[3],
252: sizeof(pidstr) - 1);
253: pidstr[sizeof(pidstr) - 1] = '\0';
254: fp = (pid_t)strtol(pidstr, NULL, 10);
1.41 millert 255: if (kp->p_pid == fp) {
1.7 downsj 256: ep->kp = kp;
257: break;
258: }
1.41 millert 259: } else if (ep->tdev == kp->p_tdev &&
260: kp->p__pgid == kp->p_tpgid) {
1.1 deraadt 261: /*
262: * Proc is in foreground of this terminal
263: */
1.41 millert 264: if (proc_compare(ep->kp, kp))
1.1 deraadt 265: ep->kp = kp;
266: break;
267: }
268: }
269: }
270: /* sort by idle time */
271: if (sortidle && ehead != NULL) {
272: struct entry *from = ehead, *save;
1.44 deraadt 273:
1.1 deraadt 274: ehead = NULL;
275: while (from != NULL) {
276: for (nextp = &ehead;
277: (*nextp) && from->idle >= (*nextp)->idle;
278: nextp = &(*nextp)->next)
279: continue;
280: save = from;
281: from = from->next;
282: save->next = *nextp;
283: *nextp = save;
284: }
285: }
1.44 deraadt 286:
1.34 deraadt 287: if (!nflag) {
1.66 deraadt 288: if (gethostname(domain, sizeof(domain)) == -1 ||
1.1 deraadt 289: (p = strchr(domain, '.')) == 0)
290: domain[0] = '\0';
291: else {
292: domain[sizeof(domain) - 1] = '\0';
293: memmove(domain, p, strlen(p) + 1);
294: }
1.34 deraadt 295: }
1.1 deraadt 296:
297: for (ep = ehead; ep != NULL; ep = ep->next) {
298: p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
1.16 millert 299: for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++)
300: if (p[i] == ':') {
301: x = &p[i];
302: *x++ = '\0';
303: break;
304: }
1.27 deraadt 305: if (!nflag && inet_aton(p, &addr) &&
306: (hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) {
1.1 deraadt 307: if (domain[0] != '\0') {
308: p = hp->h_name;
309: p += strlen(hp->h_name);
310: p -= strlen(domain);
1.31 deraadt 311: if (p > hp->h_name &&
312: strcasecmp(p, domain) == 0)
1.1 deraadt 313: *p = '\0';
314: }
315: p = hp->h_name;
316: }
317: if (x) {
318: (void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
1.34 deraadt 319: (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x);
1.1 deraadt 320: p = buf;
321: }
1.22 deraadt 322: (void)printf("%-*.*s %-2.2s %-*.*s ",
1.32 deraadt 323: NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name,
1.1 deraadt 324: strncmp(ep->utmp.ut_line, "tty", 3) ?
325: ep->utmp.ut_line : ep->utmp.ut_line + 3,
1.32 deraadt 326: HOST_WIDTH, HOST_WIDTH, *p ? p : "-");
1.1 deraadt 327: pr_attime(&ep->utmp.ut_time, &now);
328: pr_idle(ep->idle);
329: pr_args(ep->kp);
330: printf("\n");
331: }
332: exit(0);
333: }
1.62 schwarze 334:
335: static void
336: fmt_putc(int c, int *leftp)
337: {
338:
339: if (*leftp == 0)
340: return;
341: if (*leftp != -1)
342: *leftp -= 1;
343: putchar(c);
344: }
345:
346: static void
347: fmt_puts(const char *s, int *leftp)
348: {
349: static char *v = NULL;
350: static size_t maxlen = 0;
351: size_t len;
352:
353: if (*leftp == 0)
354: return;
355: len = strlen(s) * 4 + 1;
356: if (len > maxlen) {
357: free(v);
358: maxlen = 0;
359: if (len < getpagesize())
360: len = getpagesize();
361: v = malloc(len);
362: if (v == NULL)
363: return;
364: maxlen = len;
365: }
366: strvis(v, s, VIS_TAB | VIS_NL | VIS_CSTYLE);
367: if (*leftp != -1) {
368: len = strlen(v);
369: if (len > *leftp) {
370: v[*leftp] = '\0';
371: *leftp = 0;
372: } else
373: *leftp -= len;
374: }
375: printf("%s", v);
376: }
377:
1.1 deraadt 378:
379: static void
1.48 guenther 380: pr_args(struct kinfo_proc *kp)
1.1 deraadt 381: {
1.7 downsj 382: char **argv, *str;
1.1 deraadt 383: int left;
384:
1.23 millert 385: if (kp == NULL)
1.63 jca 386: goto nothing; /* no matching process found */
1.1 deraadt 387: left = argwidth;
1.48 guenther 388: argv = kvm_getargv(kd, kp, argwidth+60); /* +60 for ftpd snip */
1.23 millert 389: if (argv == NULL)
1.1 deraadt 390: goto nothing;
1.7 downsj 391:
1.23 millert 392: if (*argv == NULL || **argv == '\0') {
393: /* Process has zeroed argv[0], display executable name. */
394: fmt_putc('(', &left);
1.41 millert 395: fmt_puts(kp->p_comm, &left);
1.23 millert 396: fmt_putc(')', &left);
397: }
1.1 deraadt 398: while (*argv) {
1.46 millert 399: /*
400: * ftp argv[0] is in the following format:
401: * ftpd: HOSTNAME: [USER/PASS: ]CMD args (ftpd)
402: */
1.7 downsj 403: if (strncmp(*argv, "ftpd:", 5) == 0) {
1.46 millert 404: if ((str = strchr(*argv + 5, ':')) != NULL)
405: str = strchr(str + 1, ':');
406: if (str != NULL) {
1.54 deraadt 407: if ((str[0] == ':') &&
408: isspace((unsigned char)str[1]))
1.7 downsj 409: str += 2;
410: fmt_puts(str, &left);
411: } else
412: fmt_puts(*argv, &left);
413: } else
414: fmt_puts(*argv, &left);
1.1 deraadt 415: argv++;
416: fmt_putc(' ', &left);
417: }
418: return;
419: nothing:
420: putchar('-');
421: }
422:
423: static void
1.38 deraadt 424: pr_header(time_t *nowp, int nusers)
1.1 deraadt 425: {
426: double avenrun[3];
1.65 cheloha 427: struct timespec boottime;
1.1 deraadt 428: time_t uptime;
429: int days, hrs, i, mins;
430: char buf[256];
431:
432: /*
433: * Print time of day.
434: */
1.40 millert 435: (void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp));
1.33 smart 436: buf[sizeof(buf) - 1] = '\0';
1.1 deraadt 437: (void)printf("%s ", buf);
438:
439: /*
440: * Print how long system has been up.
441: */
1.65 cheloha 442: if (clock_gettime(CLOCK_BOOTTIME, &boottime) != -1) {
443: uptime = boottime.tv_sec;
1.19 mickey 444: if (uptime > 59) {
1.17 deraadt 445: uptime += 30;
446: days = uptime / SECSPERDAY;
447: uptime %= SECSPERDAY;
448: hrs = uptime / SECSPERHOUR;
449: uptime %= SECSPERHOUR;
1.58 millert 450: mins = uptime / 60;
1.17 deraadt 451: (void)printf(" up");
452: if (days > 0)
453: (void)printf(" %d day%s,", days,
454: days > 1 ? "s" : "");
455: if (hrs > 0 && mins > 0)
456: (void)printf(" %2d:%02d,", hrs, mins);
457: else {
458: if (hrs > 0)
459: (void)printf(" %d hr%s,",
460: hrs, hrs > 1 ? "s" : "");
461: if (mins > 0 || (days == 0 && hrs == 0))
462: (void)printf(" %d min%s,",
463: mins, mins != 1 ? "s" : "");
464: }
465: } else
1.52 guenther 466: printf(" %d secs,", (int)uptime);
1.1 deraadt 467: }
468:
469: /* Print number of users logged in to system */
470: (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");
471:
472: /*
473: * Print 1, 5, and 15 minute load averages.
474: */
475: if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
476: (void)printf(", no load average information available\n");
477: else {
478: (void)printf(", load averages:");
479: for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
480: if (i > 0)
481: (void)printf(",");
482: (void)printf(" %.2f", avenrun[i]);
483: }
484: (void)printf("\n");
485: }
486: }
487:
488: static struct stat *
1.38 deraadt 489: ttystat(char *line)
1.1 deraadt 490: {
491: static struct stat sb;
1.26 millert 492: char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE];
1.1 deraadt 493:
1.26 millert 494: /* Note, line may not be NUL-terminated */
1.33 smart 495: (void)strlcpy(ttybuf, _PATH_DEV, sizeof(ttybuf));
496: (void)strncat(ttybuf, line, sizeof(ttybuf) - 1 - strlen(ttybuf));
1.1 deraadt 497: if (stat(ttybuf, &sb))
498: return (NULL);
499: return (&sb);
500: }
501:
502: static void
1.38 deraadt 503: usage(int wcmd)
1.1 deraadt 504: {
505: if (wcmd)
506: (void)fprintf(stderr,
1.42 jmc 507: "usage: w [-ahi] [-M core] [-N system] [user]\n");
1.1 deraadt 508: else
1.33 smart 509: (void)fprintf(stderr,
1.45 jaredy 510: "usage: uptime\n");
1.1 deraadt 511: exit (1);
512: }
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