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freebsd-skq/usr.bin/w/w.c
ume 4c1d60a66b When -n is specified, don't make bogus DNS queries. Instead, 
when -n is specified more than once, hostnames stored in utmp
are attempted to resolve to display them as network addresses.

PR:		212272
2016-09-02 18:28:14 +00:00

560 lines
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/*-
* 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.
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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
#ifndef lint
static const char sccsid[] = "@(#)w.c 8.4 (Berkeley) 4/16/94";
#endif
/*
* 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/sbuf.h>
#include <sys/socket.h>
#include <sys/tty.h>
#include <sys/types.h>
#include <machine/cpu.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <langinfo.h>
#include <libgen.h>
#include <libutil.h>
#include <limits.h>
#include <locale.h>
#include <netdb.h>
#include <nlist.h>
#include <paths.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <timeconv.h>
#include <unistd.h>
#include <utmpx.h>
#include <vis.h>
#include <libxo/xo.h>
#include "extern.h"
static struct utmpx *utmp;
static struct winsize ws;
static kvm_t *kd;
static time_t now; /* the current time of day */
static int ttywidth; /* width of tty */
static int argwidth; /* width of tty */
static int header = 1; /* true if -h flag: don't print heading */
static int nflag; /* true if -n flag: don't convert addrs */
static int dflag; /* true if -d flag: output debug info */
static int sortidle; /* sort by idle time */
int use_ampm; /* use AM/PM time */
static int use_comma; /* use comma as floats separator */
static char **sel_users; /* login array of particular users selected */
/*
* One of these per active utmp entry.
*/
static struct entry {
struct entry *next;
struct utmpx 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)->ki_udata)
#define W_DISPUSERSIZE 10
#define W_DISPLINESIZE 8
#define W_DISPHOSTSIZE 40
static void pr_header(time_t *, int);
static struct stat *ttystat(char *);
static void usage(int);
char *fmt_argv(char **, char *, char *, size_t); /* ../../bin/ps/fmt.c */
int
main(int argc, char *argv[])
{
struct kinfo_proc *kp;
struct kinfo_proc *dkp;
struct stat *stp;
time_t touched;
int ch, i, nentries, nusers, wcmd, longidle, longattime;
const char *memf, *nlistf, *p, *save_p;
char *x_suffix;
char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
char fn[MAXHOSTNAMELEN];
char *dot;
(void)setlocale(LC_ALL, "");
use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
use_comma = (*nl_langinfo(RADIXCHAR) != ',');
argc = xo_parse_args(argc, argv);
if (argc < 0)
exit(1);
/* Are we w(1) or uptime(1)? */
if (strcmp(basename(argv[0]), "uptime") == 0) {
wcmd = 0;
p = "";
} else {
wcmd = 1;
p = "dhiflM:N:nsuw";
}
memf = _PATH_DEVNULL;
nlistf = NULL;
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;
break;
case 'N':
nlistf = optarg;
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.. */
if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
errx(1, "%s", errbuf);
(void)time(&now);
if (*argv)
sel_users = argv;
setutxent();
for (nusers = 0; (utmp = getutxent()) != NULL;) {
if (utmp->ut_type != USER_PROCESS)
continue;
if (!(stp = ttystat(utmp->ut_line)))
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 (!strcmp(utmp->ut_user, *user))
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 *utmp);
ep->tdev = stp->st_rdev;
/*
* If this is the console device, attempt to ascertain
* the true console device dev_t.
*/
if (ep->tdev == 0) {
size_t size;
size = sizeof(dev_t);
(void)sysctlbyname("machdep.consdev", &ep->tdev, &size, NULL, 0);
}
touched = stp->st_atime;
if (touched < ep->utmp.ut_tv.tv_sec) {
/* tty untouched since before login */
touched = ep->utmp.ut_tv.tv_sec;
}
if ((ep->idle = now - touched) < 0)
ep->idle = 0;
}
endutxent();
xo_open_container("uptime-information");
if (header || wcmd == 0) {
pr_header(&now, nusers);
if (wcmd == 0) {
xo_close_container("uptime-information");
xo_finish();
(void)kvm_close(kd);
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 (W_DISPUSERSIZE + W_DISPLINESIZE + W_DISPHOSTSIZE + \
sizeof(HEADER_LOGIN_IDLE) + 3) /* header width incl. spaces */
xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%s}",
W_DISPUSERSIZE, W_DISPUSERSIZE, HEADER_USER,
W_DISPLINESIZE, W_DISPLINESIZE, HEADER_TTY,
W_DISPHOSTSIZE, W_DISPHOSTSIZE, 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++) {
if (kp->ki_stat == SIDL || kp->ki_stat == SZOMB ||
kp->ki_tdev == NODEV)
continue;
for (ep = ehead; ep != NULL; ep = ep->next) {
if (ep->tdev == kp->ki_tdev) {
/*
* proc is associated with this terminal
*/
if (ep->kp == NULL && kp->ki_pgid == kp->ki_tpgid) {
/*
* Proc is 'most interesting'
*/
if (proc_compare(ep->kp, kp))
ep->kp = kp;
}
/*
* Proc debug option info; add to debug
* list using kinfo_proc ki_spare[0]
* 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 = strdup("-");
continue;
}
ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
ep->kp->ki_comm, NULL, 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;
}
}
xo_open_container("user-table");
xo_open_list("user-entry");
for (ep = ehead; ep != NULL; ep = ep->next) {
struct addrinfo hints, *res;
struct sockaddr_storage ss;
struct sockaddr *sa = (struct sockaddr *)&ss;
struct sockaddr_in *lsin = (struct sockaddr_in *)&ss;
struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)&ss;
time_t t;
int isaddr;
xo_open_instance("user-entry");
save_p = p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
if ((x_suffix = strrchr(p, ':')) != NULL) {
if ((dot = strchr(x_suffix, '.')) != NULL &&
strchr(dot+1, '.') == NULL)
*x_suffix++ = '\0';
else
x_suffix = NULL;
}
isaddr = 0;
memset(&ss, '\0', sizeof(ss));
if (inet_pton(AF_INET6, p, &lsin6->sin6_addr) == 1) {
lsin6->sin6_len = sizeof(*lsin6);
lsin6->sin6_family = AF_INET6;
isaddr = 1;
} else if (inet_pton(AF_INET, p, &lsin->sin_addr) == 1) {
lsin->sin_len = sizeof(*lsin);
lsin->sin_family = AF_INET;
isaddr = 1;
}
if (nflag == 0) {
/* Attempt to change an IP address into a name */
if (isaddr && realhostname_sa(fn, sizeof(fn), sa,
sa->sa_len) == HOSTNAME_FOUND)
p = fn;
} else if (!isaddr && nflag > 1) {
/*
* If a host has only one A/AAAA RR, change a
* name into an IP address
*/
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if (getaddrinfo(p, NULL, &hints, &res) == 0) {
if (res->ai_next == NULL &&
getnameinfo(res->ai_addr, res->ai_addrlen,
fn, sizeof(fn), NULL, 0,
NI_NUMERICHOST) == 0)
p = fn;
freeaddrinfo(res);
}
}
if (x_suffix) {
(void)snprintf(buf, sizeof(buf), "%s:%s", p, x_suffix);
p = buf;
}
if (dflag) {
xo_open_container("process-table");
xo_open_list("process-entry");
for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
const char *ptr;
ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
dkp->ki_comm, NULL, MAXCOMLEN);
if (ptr == NULL)
ptr = "-";
xo_open_instance("process-entry");
xo_emit("\t\t{:process-id/%-9d/%d} {:command/%s}\n",
dkp->ki_pid, ptr);
xo_close_instance("process-entry");
}
xo_close_list("process-entry");
xo_close_container("process-table");
}
xo_emit("{:user/%-*.*s/%@**@s} {:tty/%-*.*s/%@**@s} ",
W_DISPUSERSIZE, W_DISPUSERSIZE, ep->utmp.ut_user,
W_DISPLINESIZE, W_DISPLINESIZE,
*ep->utmp.ut_line ?
(strncmp(ep->utmp.ut_line, "tty", 3) &&
strncmp(ep->utmp.ut_line, "cua", 3) ?
ep->utmp.ut_line : ep->utmp.ut_line + 3) : "-");
if (save_p && save_p != p)
xo_attr("address", "%s", save_p);
xo_emit("{:from/%-*.*s/%@**@s} ",
W_DISPHOSTSIZE, W_DISPHOSTSIZE, *p ? p : "-");
t = ep->utmp.ut_tv.tv_sec;
longattime = pr_attime(&t, &now);
longidle = pr_idle(ep->idle);
xo_emit("{:command/%.*s/%@*@s}\n",
argwidth - longidle - longattime,
ep->args);
xo_close_instance("user-entry");
}
xo_close_list("user-entry");
xo_close_container("user-table");
xo_close_container("uptime-information");
xo_finish();
(void)kvm_close(kd);
exit(0);
}
static void
pr_header(time_t *nowp, int nusers)
{
double avenrun[3];
time_t uptime;
struct timespec tp;
int days, hrs, i, mins, secs;
char buf[256];
struct sbuf *upbuf;
upbuf = sbuf_new_auto();
/*
* Print time of day.
*/
if (strftime(buf, sizeof(buf),
use_ampm ? "%l:%M%p" : "%k:%M", localtime(nowp)) != 0)
xo_emit("{:time-of-day/%s} ", buf);
/*
* Print how long system has been up.
*/
if (clock_gettime(CLOCK_UPTIME, &tp) != -1) {
uptime = tp.tv_sec;
if (uptime > 60)
uptime += 30;
days = uptime / 86400;
uptime %= 86400;
hrs = uptime / 3600;
uptime %= 3600;
mins = uptime / 60;
secs = uptime % 60;
xo_emit(" up");
xo_emit("{e:uptime/%lu}", (unsigned long) tp.tv_sec);
xo_emit("{e:days/%d}{e:hours/%d}{e:minutes/%d}{e:seconds/%d}", days, hrs, mins, secs);
if (days > 0)
sbuf_printf(upbuf, " %d day%s,",
days, days > 1 ? "s" : "");
if (hrs > 0 && mins > 0)
sbuf_printf(upbuf, " %2d:%02d,", hrs, mins);
else if (hrs > 0)
sbuf_printf(upbuf, " %d hr%s,",
hrs, hrs > 1 ? "s" : "");
else if (mins > 0)
sbuf_printf(upbuf, " %d min%s,",
mins, mins > 1 ? "s" : "");
else
sbuf_printf(upbuf, " %d sec%s,",
secs, secs > 1 ? "s" : "");
if (sbuf_finish(upbuf) != 0)
xo_err(1, "Could not generate output");
xo_emit("{:uptime-human/%s}", sbuf_data(upbuf));
sbuf_delete(upbuf);
}
/* Print number of users logged in to system */
xo_emit(" {:users/%d} {N:user%s}", nusers, nusers == 1 ? "" : "s");
/*
* Print 1, 5, and 15 minute load averages.
*/
if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
xo_emit(", no load average information available\n");
else {
static const char *format[] = {
" {:load-average-1/%.2f}",
" {:load-average-5/%.2f}",
" {:load-average-15/%.2f}",
};
xo_emit(", load averages:");
for (i = 0; i < (int)(sizeof(avenrun) / sizeof(avenrun[0])); i++) {
if (use_comma && i > 0)
xo_emit(",");
xo_emit(format[i], avenrun[i]);
}
xo_emit("\n");
}
}
static struct stat *
ttystat(char *line)
{
static struct stat sb;
char ttybuf[MAXPATHLEN];
(void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line);
if (stat(ttybuf, &sb) == 0 && S_ISCHR(sb.st_mode)) {
return (&sb);
} else
return (NULL);
}
static void
usage(int wcmd)
{
if (wcmd)
xo_error("usage: w [-dhin] [-M core] [-N system] [user ...]\n");
else
xo_error("usage: uptime\n");
xo_finish();
exit(1);
}
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