Annotation of src/usr.bin/w/w.c, Revision 1.31
1.31 ! deraadt 1: /* $OpenBSD: w.c,v 1.30 2000/07/07 21:09:02 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.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
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: #ifndef lint
37: static char copyright[] =
38: "@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
39: The Regents of the University of California. All rights reserved.\n";
40: #endif /* not lint */
41:
42: #ifndef lint
1.23 millert 43: #if 0
1.1 deraadt 44: static char sccsid[] = "@(#)w.c 8.4 (Berkeley) 4/16/94";
1.23 millert 45: #else
1.31 ! deraadt 46: static char *rcsid = "$OpenBSD: w.c,v 1.30 2000/07/07 21:09:02 deraadt Exp $";
1.23 millert 47: #endif
1.1 deraadt 48: #endif /* not lint */
49:
50: /*
51: * w - print system status (who and what)
52: *
53: * This program is similar to the systat command on Tenex/Tops 10/20
54: *
55: */
56: #include <sys/param.h>
57: #include <sys/time.h>
58: #include <sys/stat.h>
59: #include <sys/sysctl.h>
60: #include <sys/proc.h>
61: #include <sys/user.h>
62: #include <sys/ioctl.h>
63: #include <sys/socket.h>
64: #include <sys/tty.h>
65:
66: #include <machine/cpu.h>
67: #include <netinet/in.h>
68: #include <arpa/inet.h>
69:
70: #include <ctype.h>
71: #include <err.h>
72: #include <errno.h>
73: #include <fcntl.h>
74: #include <kvm.h>
75: #include <netdb.h>
76: #include <nlist.h>
77: #include <paths.h>
78: #include <stdio.h>
79: #include <stdlib.h>
80: #include <string.h>
81: #include <tzfile.h>
82: #include <unistd.h>
1.5 deraadt 83: #include <limits.h>
1.1 deraadt 84: #include <utmp.h>
85: #include <vis.h>
86:
87: #include "extern.h"
88:
89: struct timeval boottime;
90: struct utmp utmp;
91: struct winsize ws;
92: kvm_t *kd;
93: time_t now; /* the current time of day */
94: time_t uptime; /* time of last reboot & elapsed time since */
95: int ttywidth; /* width of tty */
96: int argwidth; /* width of tty */
97: int header = 1; /* true if -h flag: don't print heading */
1.6 deraadt 98: int nflag = 1; /* true if -n flag: don't convert addrs */
1.1 deraadt 99: int sortidle; /* sort bu idle time */
100: char *sel_user; /* login of particular user selected */
101: char domain[MAXHOSTNAMELEN];
102:
103: /*
104: * One of these per active utmp entry.
105: */
106: struct entry {
107: struct entry *next;
108: struct utmp utmp;
109: dev_t tdev; /* dev_t of terminal */
110: time_t idle; /* idle time of terminal in seconds */
111: struct kinfo_proc *kp; /* `most interesting' proc */
112: } *ep, *ehead = NULL, **nextp = &ehead;
113:
114: static void pr_args __P((struct kinfo_proc *));
115: static void pr_header __P((time_t *, int));
116: static struct stat
117: *ttystat __P((char *));
118: static void usage __P((int));
119:
120: int
121: main(argc, argv)
122: int argc;
123: char **argv;
124: {
125: extern char *__progname;
126: struct kinfo_proc *kp;
127: struct hostent *hp;
128: struct stat *stp;
129: FILE *ut;
1.27 deraadt 130: struct in_addr addr;
1.1 deraadt 131: int ch, i, nentries, nusers, wcmd;
132: char *memf, *nlistf, *p, *x;
1.5 deraadt 133: char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
1.1 deraadt 134:
135: /* Are we w(1) or uptime(1)? */
136: p = __progname;
137: if (*p == '-')
138: p++;
1.19 mickey 139: if (p[0] == 'w' && p[1] == '\0') {
140: wcmd = 1;
141: p = "hiflM:N:asuw";
142: } else if (!strcmp(p, "uptime")) {
1.1 deraadt 143: wcmd = 0;
1.28 millert 144: p = "M:N:";
1.19 mickey 145: } else
1.20 kstailey 146: errx(1,
147: "this program should be invoked only as \"w\" or \"uptime\"");
1.1 deraadt 148:
149: memf = nlistf = NULL;
1.12 millert 150: while ((ch = getopt(argc, argv, p)) != -1)
1.1 deraadt 151: switch (ch) {
152: case 'h':
153: header = 0;
154: break;
155: case 'i':
156: sortidle = 1;
157: break;
158: case 'M':
159: header = 0;
160: memf = optarg;
161: break;
162: case 'N':
163: nlistf = optarg;
164: break;
1.6 deraadt 165: case 'a':
166: nflag = 0;
1.1 deraadt 167: break;
168: case 'f': case 'l': case 's': case 'u': case 'w':
169: warnx("[-flsuw] no longer supported");
170: /* FALLTHROUGH */
171: case '?':
172: default:
173: usage(wcmd);
174: }
175: argc -= optind;
176: argv += optind;
177:
1.3 deraadt 178: /*
179: * Discard setgid privileges if not the running kernel so that bad
180: * guys can't print interesting stuff from kernel memory.
181: */
1.11 tholo 182: if (nlistf != NULL || memf != NULL) {
183: setegid(getgid());
1.3 deraadt 184: setgid(getgid());
1.11 tholo 185: }
1.3 deraadt 186:
1.1 deraadt 187: if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
188: errx(1, "%s", errbuf);
1.25 deraadt 189:
190: setegid(getgid());
191: setgid(getgid());
1.1 deraadt 192:
193: (void)time(&now);
194: if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
195: err(1, "%s", _PATH_UTMP);
196:
197: if (*argv)
198: sel_user = *argv;
199:
200: for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
201: if (utmp.ut_name[0] == '\0')
202: continue;
203: ++nusers;
204: if (wcmd == 0 || (sel_user &&
205: strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
206: continue;
207: if ((ep = calloc(1, sizeof(struct entry))) == NULL)
208: err(1, NULL);
209: *nextp = ep;
210: nextp = &(ep->next);
1.26 millert 211: memcpy(&(ep->utmp), &utmp, sizeof(struct utmp));
1.1 deraadt 212: if (!(stp = ttystat(ep->utmp.ut_line)))
213: continue;
214: ep->tdev = stp->st_rdev;
215: #ifdef CPU_CONSDEV
216: /*
217: * If this is the console device, attempt to ascertain
218: * the true console device dev_t.
219: */
220: if (ep->tdev == 0) {
221: int mib[2];
222: size_t size;
223:
224: mib[0] = CTL_MACHDEP;
225: mib[1] = CPU_CONSDEV;
226: size = sizeof(dev_t);
227: (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
228: }
229: #endif
230: if ((ep->idle = now - stp->st_atime) < 0)
231: ep->idle = 0;
232: }
233: (void)fclose(ut);
234:
235: if (header || wcmd == 0) {
236: pr_header(&now, nusers);
237: if (wcmd == 0)
238: exit (0);
239: }
240:
1.30 deraadt 241: #define HEADER "USER TTY FROM LOGIN@ IDLE WHAT"
242: #define WUSED (sizeof (HEADER) - sizeof ("WHAT"))
243: (void)puts(HEADER);
1.1 deraadt 244:
245: if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
1.2 deraadt 246: errx(1, "%s", kvm_geterr(kd));
1.1 deraadt 247: for (i = 0; i < nentries; i++, kp++) {
248: struct proc *p = &kp->kp_proc;
249: struct eproc *e;
250:
251: if (p->p_stat == SIDL || p->p_stat == SZOMB)
252: continue;
253: e = &kp->kp_eproc;
254: for (ep = ehead; ep != NULL; ep = ep->next) {
1.7 downsj 255: /* ftp is a special case. */
256: if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) {
1.26 millert 257: char pidstr[UT_LINESIZE-2];
258: pid_t fp;
259:
260: (void)strncpy(pidstr, &ep->utmp.ut_line[3],
261: sizeof(pidstr) - 1);
262: pidstr[sizeof(pidstr) - 1] = '\0';
263: fp = (pid_t)strtol(pidstr, NULL, 10);
1.7 downsj 264: if (p->p_pid == fp) {
265: ep->kp = kp;
266: break;
267: }
268: } else if (ep->tdev == e->e_tdev
269: && e->e_pgid == e->e_tpgid) {
1.1 deraadt 270: /*
271: * Proc is in foreground of this terminal
272: */
273: if (proc_compare(&ep->kp->kp_proc, p))
274: ep->kp = kp;
275: break;
276: }
277: }
278: }
279: if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
280: ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
281: ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
282: ttywidth = 79;
283: else
284: ttywidth = ws.ws_col - 1;
285: argwidth = ttywidth - WUSED;
286: if (argwidth < 4)
287: argwidth = 8;
288: /* sort by idle time */
289: if (sortidle && ehead != NULL) {
290: struct entry *from = ehead, *save;
291:
292: ehead = NULL;
293: while (from != NULL) {
294: for (nextp = &ehead;
295: (*nextp) && from->idle >= (*nextp)->idle;
296: nextp = &(*nextp)->next)
297: continue;
298: save = from;
299: from = from->next;
300: save->next = *nextp;
301: *nextp = save;
302: }
303: }
304:
305: if (!nflag)
306: if (gethostname(domain, sizeof(domain) - 1) < 0 ||
307: (p = strchr(domain, '.')) == 0)
308: domain[0] = '\0';
309: else {
310: domain[sizeof(domain) - 1] = '\0';
311: memmove(domain, p, strlen(p) + 1);
312: }
313:
314: for (ep = ehead; ep != NULL; ep = ep->next) {
315: p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
1.16 millert 316: for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++)
317: if (p[i] == ':') {
318: x = &p[i];
319: *x++ = '\0';
320: break;
321: }
1.27 deraadt 322: if (!nflag && inet_aton(p, &addr) &&
323: (hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) {
1.1 deraadt 324: if (domain[0] != '\0') {
325: p = hp->h_name;
326: p += strlen(hp->h_name);
327: p -= strlen(domain);
1.31 ! deraadt 328: if (p > hp->h_name &&
! 329: strcasecmp(p, domain) == 0)
1.1 deraadt 330: *p = '\0';
331: }
332: p = hp->h_name;
333: }
334: if (x) {
335: (void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
336: ep->utmp.ut_host + UT_HOSTSIZE - x, x);
337: p = buf;
338: }
1.22 deraadt 339: (void)printf("%-*.*s %-2.2s %-*.*s ",
1.1 deraadt 340: UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
341: strncmp(ep->utmp.ut_line, "tty", 3) ?
342: ep->utmp.ut_line : ep->utmp.ut_line + 3,
343: UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
344: pr_attime(&ep->utmp.ut_time, &now);
345: pr_idle(ep->idle);
346: pr_args(ep->kp);
347: printf("\n");
348: }
349: exit(0);
350: }
351:
352: static void
353: pr_args(kp)
354: struct kinfo_proc *kp;
355: {
1.7 downsj 356: char **argv, *str;
1.1 deraadt 357: int left;
358:
1.23 millert 359: if (kp == NULL)
1.1 deraadt 360: goto nothing;
361: left = argwidth;
1.26 millert 362: argv = kvm_getargv(kd, kp, argwidth+60); /* +60 for ftpd snip */
1.23 millert 363: if (argv == NULL)
1.1 deraadt 364: goto nothing;
1.7 downsj 365:
1.23 millert 366: if (*argv == NULL || **argv == '\0') {
367: /* Process has zeroed argv[0], display executable name. */
368: fmt_putc('(', &left);
369: fmt_puts(kp->kp_proc.p_comm, &left);
370: fmt_putc(')', &left);
371: }
1.1 deraadt 372: while (*argv) {
1.7 downsj 373: /* ftp is a special case... */
374: if (strncmp(*argv, "ftpd:", 5) == 0) {
375: str = strrchr(*argv, ':');
376: if (str != (char *)NULL) {
1.8 downsj 377: if ((str[0] == ':') && isspace(str[1]))
1.7 downsj 378: str += 2;
379: fmt_puts(str, &left);
380: } else
381: fmt_puts(*argv, &left);
382: } else
383: fmt_puts(*argv, &left);
1.1 deraadt 384: argv++;
385: fmt_putc(' ', &left);
386: }
387: return;
388: nothing:
389: putchar('-');
390: }
391:
392: static void
393: pr_header(nowp, nusers)
394: time_t *nowp;
395: int nusers;
396: {
397: double avenrun[3];
398: time_t uptime;
399: int days, hrs, i, mins;
400: int mib[2];
401: size_t size;
402: char buf[256];
403:
404: /*
405: * Print time of day.
406: *
407: * SCCS forces the string manipulation below, as it replaces
408: * %, M, and % in a character string with the file name.
409: */
1.14 deraadt 410: (void)strftime(buf, sizeof(buf) - 1,
1.1 deraadt 411: __CONCAT("%l:%","M%p"), localtime(nowp));
1.14 deraadt 412: buf[sizeof buf -1] = '\0';
1.1 deraadt 413: (void)printf("%s ", buf);
414:
415: /*
416: * Print how long system has been up.
417: * (Found by looking getting "boottime" from the kernel)
418: */
419: mib[0] = CTL_KERN;
420: mib[1] = KERN_BOOTTIME;
421: size = sizeof(boottime);
1.17 deraadt 422: if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1) {
1.1 deraadt 423: uptime = now - boottime.tv_sec;
1.19 mickey 424: if (uptime > 59) {
1.17 deraadt 425: uptime += 30;
426: days = uptime / SECSPERDAY;
427: uptime %= SECSPERDAY;
428: hrs = uptime / SECSPERHOUR;
429: uptime %= SECSPERHOUR;
430: mins = uptime / SECSPERMIN;
431: (void)printf(" up");
432: if (days > 0)
433: (void)printf(" %d day%s,", days,
434: days > 1 ? "s" : "");
435: if (hrs > 0 && mins > 0)
436: (void)printf(" %2d:%02d,", hrs, mins);
437: else {
438: if (hrs > 0)
439: (void)printf(" %d hr%s,",
440: hrs, hrs > 1 ? "s" : "");
441: if (mins > 0 || (days == 0 && hrs == 0))
442: (void)printf(" %d min%s,",
443: mins, mins != 1 ? "s" : "");
444: }
445: } else
1.18 deraadt 446: printf(" %d secs,", uptime);
1.1 deraadt 447: }
448:
449: /* Print number of users logged in to system */
450: (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");
451:
452: /*
453: * Print 1, 5, and 15 minute load averages.
454: */
455: if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
456: (void)printf(", no load average information available\n");
457: else {
458: (void)printf(", load averages:");
459: for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
460: if (i > 0)
461: (void)printf(",");
462: (void)printf(" %.2f", avenrun[i]);
463: }
464: (void)printf("\n");
465: }
466: }
467:
468: static struct stat *
469: ttystat(line)
470: char *line;
471: {
472: static struct stat sb;
1.26 millert 473: char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE];
1.1 deraadt 474:
1.26 millert 475: /* Note, line may not be NUL-terminated */
476: (void)strcpy(ttybuf, _PATH_DEV);
477: (void)strncpy(ttybuf + sizeof(_PATH_DEV) - 1, line, UT_LINESIZE);
478: ttybuf[sizeof(ttybuf) - 1] = '\0';
1.1 deraadt 479: if (stat(ttybuf, &sb))
480: return (NULL);
481: return (&sb);
482: }
483:
484: static void
485: usage(wcmd)
486: int wcmd;
487: {
488: if (wcmd)
489: (void)fprintf(stderr,
1.13 angelos 490: "usage: w: [-hia] [-M core] [-N system] [user]\n");
1.1 deraadt 491: else
1.24 deraadt 492: (void)fprintf(stderr, "usage: uptime\n");
1.1 deraadt 493: exit (1);
494: }
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