freebsd-dev/usr.bin/w/w.c
Peter Wemm 6ff4ec180d Use the same technique as ps(1) to avoid the need for setgid. (ie: use
/dev/null as the default kernel and /dev/mem filenames, but still allow
the usual overrides)
1999-11-17 15:28:45 +00:00

520 lines
13 KiB
C

/*-
* Copyright (c) 1980, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)w.c 8.4 (Berkeley) 4/16/94";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
/*
* w - print system status (who and what)
*
* This program is similar to the systat command on Tenex/Tops 10/20
*
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/tty.h>
#include <machine/cpu.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <netdb.h>
#include <nlist.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utmp.h>
#include <vis.h>
#include <locale.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include "extern.h"
struct timeval boottime;
struct utmp utmp;
struct winsize ws;
kvm_t *kd;
time_t now; /* the current time of day */
time_t uptime; /* time of last reboot & elapsed time since */
int ttywidth; /* width of tty */
int argwidth; /* width of tty */
int header = 1; /* true if -h flag: don't print heading */
int nflag; /* true if -n flag: don't convert addrs */
int dflag; /* true if -d flag: output debug info */
int sortidle; /* sort by idle time */
char **sel_users; /* login array of particular users selected */
char domain[MAXHOSTNAMELEN];
/*
* One of these per active utmp entry.
*/
struct entry {
struct entry *next;
struct utmp utmp;
dev_t tdev; /* dev_t of terminal */
time_t idle; /* idle time of terminal in seconds */
struct kinfo_proc *kp; /* `most interesting' proc */
char *args; /* arg list of interesting process */
struct kinfo_proc *dkp; /* debug option proc list */
} *ep, *ehead = NULL, **nextp = &ehead;
#define debugproc(p) *((struct kinfo_proc **)&(p)->kp_eproc.e_spare[0])
static void pr_header __P((time_t *, int));
static struct stat *ttystat __P((char *, int));
static void usage __P((int));
static int this_is_uptime __P((const char *s));
char *fmt_argv __P((char **, char *, int)); /* ../../bin/ps/fmt.c */
int
main(argc, argv)
int argc;
char **argv;
{
struct kinfo_proc *kp;
struct kinfo_proc *dkp;
struct hostent *hp;
struct stat *stp;
FILE *ut;
u_long l;
int ch, i, nentries, nusers, wcmd, longidle, dropgid;
char *memf, *nlistf, *p, *x;
char buf[MAXHOSTNAMELEN], errbuf[256];
(void)setlocale(LC_ALL, "");
/* Are we w(1) or uptime(1)? */
if (this_is_uptime(argv[0]) == 0) {
wcmd = 0;
p = "";
} else {
wcmd = 1;
p = "dhiflM:N:nsuw";
}
dropgid = 0;
memf = nlistf = _PATH_DEVNULL;
while ((ch = getopt(argc, argv, p)) != -1)
switch (ch) {
case 'd':
dflag = 1;
break;
case 'h':
header = 0;
break;
case 'i':
sortidle = 1;
break;
case 'M':
header = 0;
memf = optarg;
dropgid = 1;
break;
case 'N':
nlistf = optarg;
dropgid = 1;
break;
case 'n':
nflag = 1;
break;
case 'f': case 'l': case 's': case 'u': case 'w':
warnx("[-flsuw] no longer supported");
/* FALLTHROUGH */
case '?':
default:
usage(wcmd);
}
argc -= optind;
argv += optind;
if (!(_res.options & RES_INIT))
res_init();
_res.retrans = 2; /* resolver timeout to 2 seconds per try */
_res.retry = 1; /* only try once.. */
/*
* Discard setgid privileges if not the running kernel so that bad
* guys can't print interesting stuff from kernel memory.
*/
if (dropgid)
setgid(getgid());
if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
errx(1, "%s", errbuf);
(void)time(&now);
if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
err(1, "%s", _PATH_UTMP);
if (*argv)
sel_users = argv;
for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
if (utmp.ut_name[0] == '\0')
continue;
if (!(stp = ttystat(utmp.ut_line, UT_LINESIZE)))
continue; /* corrupted record */
++nusers;
if (wcmd == 0)
continue;
if (sel_users) {
int usermatch;
char **user;
usermatch = 0;
for (user = sel_users; !usermatch && *user; user++)
if (!strncmp(utmp.ut_name, *user, UT_NAMESIZE))
usermatch = 1;
if (!usermatch)
continue;
}
if ((ep = calloc(1, sizeof(struct entry))) == NULL)
errx(1, "calloc");
*nextp = ep;
nextp = &ep->next;
memmove(&ep->utmp, &utmp, sizeof(struct utmp));
ep->tdev = stp->st_rdev;
#ifdef CPU_CONSDEV
/*
* If this is the console device, attempt to ascertain
* the true console device dev_t.
*/
if (ep->tdev == 0) {
int mib[2];
size_t size;
mib[0] = CTL_MACHDEP;
mib[1] = CPU_CONSDEV;
size = sizeof(dev_t);
(void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
}
#endif
if ((ep->idle = now - stp->st_atime) < 0)
ep->idle = 0;
}
(void)fclose(ut);
if (header || wcmd == 0) {
pr_header(&now, nusers);
if (wcmd == 0)
exit(0);
#define HEADER_USER "USER"
#define HEADER_TTY "TTY"
#define HEADER_FROM "FROM"
#define HEADER_LOGIN_IDLE "LOGIN@ IDLE "
#define HEADER_WHAT "WHAT\n"
#define WUSED (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
sizeof(HEADER_LOGIN_IDLE) + 3) /* header width incl. spaces */
(void)printf("%-*.*s %-*.*s %-*.*s %s",
UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM,
HEADER_LOGIN_IDLE HEADER_WHAT);
}
if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
err(1, "%s", kvm_geterr(kd));
for (i = 0; i < nentries; i++, kp++) {
struct proc *pr = &kp->kp_proc;
struct eproc *e;
if (pr->p_stat == SIDL || pr->p_stat == SZOMB)
continue;
e = &kp->kp_eproc;
for (ep = ehead; ep != NULL; ep = ep->next) {
if (ep->tdev == e->e_tdev) {
/*
* proc is associated with this terminal
*/
if (ep->kp == NULL && e->e_pgid == e->e_tpgid) {
/*
* Proc is 'most interesting'
*/
if (proc_compare(&ep->kp->kp_proc, pr))
ep->kp = kp;
}
/*
* Proc debug option info; add to debug
* list using kinfo_proc kp_eproc.e_spare
* as next pointer; ptr to ptr avoids the
* ptr = long assumption.
*/
dkp = ep->dkp;
ep->dkp = kp;
debugproc(kp) = dkp;
}
}
}
if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
ttywidth = 79;
else
ttywidth = ws.ws_col - 1;
argwidth = ttywidth - WUSED;
if (argwidth < 4)
argwidth = 8;
for (ep = ehead; ep != NULL; ep = ep->next) {
if (ep->kp == NULL) {
ep->args = "-";
continue;
}
ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
ep->kp->kp_proc.p_comm, MAXCOMLEN);
if (ep->args == NULL)
err(1, NULL);
}
/* sort by idle time */
if (sortidle && ehead != NULL) {
struct entry *from, *save;
from = ehead;
ehead = NULL;
while (from != NULL) {
for (nextp = &ehead;
(*nextp) && from->idle >= (*nextp)->idle;
nextp = &(*nextp)->next)
continue;
save = from;
from = from->next;
save->next = *nextp;
*nextp = save;
}
}
if (!nflag) {
if (gethostname(domain, sizeof(domain) - 1) < 0 ||
(p = strchr(domain, '.')) == NULL)
domain[0] = '\0';
else {
domain[sizeof(domain) - 1] = '\0';
memmove(domain, p, strlen(p) + 1);
}
}
for (ep = ehead; ep != NULL; ep = ep->next) {
char host_buf[UT_HOSTSIZE + 1];
host_buf[UT_HOSTSIZE] = '\0';
strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
p = *host_buf ? host_buf : "-";
if ((x = strchr(p, ':')) != NULL)
*x++ = '\0';
if (!nflag && isdigit(*p) && (l = inet_addr(p)) != -1 &&
(hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
if (domain[0] != '\0') {
p = hp->h_name;
p += strlen(hp->h_name);
p -= strlen(domain);
if (p > hp->h_name && strcmp(p, domain) == 0)
*p = '\0';
}
p = hp->h_name;
}
if (nflag && *p && strcmp(p, "-") &&
inet_addr(p) == INADDR_NONE) {
hp = gethostbyname(p);
if (hp != NULL) {
struct in_addr in;
memmove(&in, hp->h_addr, sizeof(in));
p = inet_ntoa(in);
}
}
if (x) {
(void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
p = buf;
}
if (dflag) {
for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
char *ptr;
ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
dkp->kp_proc.p_comm, MAXCOMLEN);
if (ptr == NULL)
ptr = "-";
(void)printf("\t\t%-9d %s\n",
dkp->kp_proc.p_pid, ptr);
}
}
(void)printf("%-*.*s %-*.*s %-*.*s ",
UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
UT_LINESIZE, UT_LINESIZE,
strncmp(ep->utmp.ut_line, "tty", 3) &&
strncmp(ep->utmp.ut_line, "cua", 3) ?
ep->utmp.ut_line : ep->utmp.ut_line + 3,
UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
pr_attime(&ep->utmp.ut_time, &now);
longidle = pr_idle(ep->idle);
(void)printf("%.*s\n", argwidth - longidle, ep->args);
}
exit(0);
}
static void
pr_header(nowp, nusers)
time_t *nowp;
int nusers;
{
double avenrun[3];
time_t uptime;
int days, hrs, i, mins, secs;
int mib[2];
size_t size;
char buf[256];
/*
* Print time of day.
*/
(void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp));
buf[sizeof(buf) - 1] = '\0';
(void)printf("%s ", buf);
/*
* Print how long system has been up.
* (Found by looking getting "boottime" from the kernel)
*/
mib[0] = CTL_KERN;
mib[1] = KERN_BOOTTIME;
size = sizeof(boottime);
if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
boottime.tv_sec != 0) {
uptime = now - boottime.tv_sec;
uptime += 30;
days = uptime / 86400;
uptime %= 86400;
hrs = uptime / 3600;
uptime %= 3600;
mins = uptime / 60;
secs = uptime % 60;
(void)printf(" up");
if (days > 0)
(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
if (hrs > 0 && mins > 0)
(void)printf(" %2d:%02d,", hrs, mins);
else if (hrs > 0)
(void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
else if (mins > 0)
(void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
else
(void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
}
/* Print number of users logged in to system */
(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
/*
* Print 1, 5, and 15 minute load averages.
*/
if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
(void)printf(", no load average information available\n");
else {
(void)printf(", load averages:");
for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++)
(void)printf("%s %.2f", i > 0 ? "," : "", avenrun[i]);
(void)printf("\n");
}
}
static struct stat *
ttystat(line, sz)
char *line;
int sz;
{
static struct stat sb;
char ttybuf[MAXPATHLEN];
(void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
if (stat(ttybuf, &sb)) {
warn("%s", ttybuf);
return (NULL);
}
return (&sb);
}
static void
usage(wcmd)
int wcmd;
{
if (wcmd)
(void)fprintf(stderr,
"usage: w [-dhin] [-M core] [-N system] [user ...]\n");
else
(void)fprintf(stderr, "usage: uptime\n");
exit(1);
}
static int
this_is_uptime(s)
const char *s;
{
const char *u;
if ((u = strrchr(s, '/')) != NULL)
++u;
else
u = s;
if (strcmp(u, "uptime") == 0)
return (0);
return (-1);
}