/* $Header: /src/pub/tcsh/tc.who.c,v 3.32 2000/11/12 02:18:07 christos Exp $ */
/*
* tc.who.c: Watch logins and logouts...
*/
/*-
* Copyright (c) 1980, 1991 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.
*/
#include "sh.h"
RCSID("$Id: tc.who.c,v 3.32 2000/11/12 02:18:07 christos Exp $")
#include "tc.h"
#ifndef HAVENOUTMP
/*
* kfk 26 Jan 1984 - for login watch functions.
*/
#include <ctype.h>
#ifdef HAVEUTMPX
# include <utmpx.h>
/* I just redefine a few words here. Changing every occurrence below
* seems like too much of work. All UTMP functions have equivalent
* UTMPX counterparts, so they can be added all here when needed.
* Kimmo Suominen, Oct 14 1991
*/
# ifndef _PATH_UTMP
# if defined(__UTMPX_FILE) && !defined(UTMPX_FILE)
# define _PATH_UTMP __UTMPX_FILE
# else
# define _PATH_UTMP UTMPX_FILE
# endif /* __UTMPX_FILE && !UTMPX_FILE */
# endif /* _PATH_UTMP */
# define utmp utmpx
# ifdef __MVS__
# define ut_time ut_tv.tv_sec
# define ut_name ut_user
# else
# define ut_time ut_xtime
# endif /* __MVS__ */
#else /* !HAVEUTMPX */
# ifndef WINNT_NATIVE
# include <utmp.h>
# endif /* WINNT_NATIVE */
#endif /* HAVEUTMPX */
#ifndef BROKEN_CC
# define UTNAMLEN sizeof(((struct utmp *) 0)->ut_name)
# define UTLINLEN sizeof(((struct utmp *) 0)->ut_line)
# ifdef UTHOST
# ifdef _SEQUENT_
# define UTHOSTLEN 100
# else
# define UTHOSTLEN sizeof(((struct utmp *) 0)->ut_host)
# endif
# endif /* UTHOST */
#else
/* give poor cc a little help if it needs it */
struct utmp __ut;
# define UTNAMLEN sizeof(__ut.ut_name)
# define UTLINLEN sizeof(__ut.ut_line)
# ifdef UTHOST
# ifdef _SEQUENT_
# define UTHOSTLEN 100
# else
# define UTHOSTLEN sizeof(__ut.ut_host)
# endif
# endif /* UTHOST */
#endif /* BROKEN_CC */
#ifndef _PATH_UTMP
# ifdef UTMP_FILE
# define _PATH_UTMP UTMP_FILE
# else
# define _PATH_UTMP "/etc/utmp"
# endif /* UTMP_FILE */
#endif /* _PATH_UTMP */
struct who {
struct who *who_next;
struct who *who_prev;
char who_name[UTNAMLEN + 1];
char who_new[UTNAMLEN + 1];
char who_tty[UTLINLEN + 1];
#ifdef UTHOST
char who_host[UTHOSTLEN + 1];
#endif /* UTHOST */
time_t who_time;
int who_status;
};
static struct who whohead, whotail;
static time_t watch_period = 0;
static time_t stlast = 0;
#ifdef WHODEBUG
static void debugwholist __P((struct who *, struct who *));
#endif
static void print_who __P((struct who *));
#define ONLINE 01
#define OFFLINE 02
#define CHANGED 04
#define STMASK 07
#define ANNOUNCE 010
/*
* Karl Kleinpaste, 26 Jan 1984.
* Initialize the dummy tty list for login watch.
* This dummy list eliminates boundary conditions
* when doing pointer-chase searches.
*/
void
initwatch()
{
whohead.who_next = &whotail;
whotail.who_prev = &whohead;
stlast = 1;
#ifdef WHODEBUG
debugwholist(NULL, NULL);
#endif /* WHODEBUG */
}
void
resetwatch()
{
watch_period = 0;
stlast = 0;
}
/*
* Karl Kleinpaste, 26 Jan 1984.
* Watch /etc/utmp for login/logout changes.
*/
void
watch_login(force)
int force;
{
int utmpfd, comp = -1, alldone;
int firsttime = stlast == 1;
#ifdef BSDSIGS
sigmask_t omask;
#endif /* BSDSIGS */
struct utmp utmp;
struct who *wp, *wpnew;
struct varent *v;
Char **vp = NULL;
time_t t, interval = MAILINTVL;
struct stat sta;
#if defined(UTHOST) && defined(_SEQUENT_)
char *host, *ut_find_host();
#endif
#ifdef WINNT_NATIVE
static int ncbs_posted = 0;
USE(utmp);
USE(utmpfd);
USE(sta);
USE(wpnew);
#endif /* WINNT_NATIVE */
/* stop SIGINT, lest our login list get trashed. */
#ifdef BSDSIGS
omask = sigblock(sigmask(SIGINT));
#else
(void) sighold(SIGINT);
#endif
v = adrof(STRwatch);
if (v == NULL && !force) {
#ifdef BSDSIGS
(void) sigsetmask(omask);
#else
(void) sigrelse(SIGINT);
#endif
return; /* no names to watch */
}
if (!force) {
trim(vp = v->vec);
if (blklen(vp) % 2) /* odd # args: 1st == # minutes. */
interval = (number(*vp)) ? (getn(*vp++) * 60) : MAILINTVL;
}
else
interval = 0;
(void) time(&t);
#ifdef WINNT_NATIVE
/*
* Since NCB_ASTATs take time, start em async at least 90 secs
* before we are due -amol 6/5/97
*/
if (!ncbs_posted) {
unsigned long tdiff = t - watch_period;
if (!watch_period || ((tdiff > 0) && (tdiff > (interval - 90)))) {
start_ncbs(vp);
ncbs_posted = 1;
}
}
#endif /* WINNT_NATIVE */
if (t - watch_period < interval) {
#ifdef BSDSIGS
(void) sigsetmask(omask);
#else
(void) sigrelse(SIGINT);
#endif
return; /* not long enough yet... */
}
watch_period = t;
#ifdef WINNT_NATIVE
ncbs_posted = 0;
#else /* !WINNT_NATIVE */
/*
* From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
* Don't open utmp all the time, stat it first...
*/
if (stat(_PATH_UTMP, &sta)) {
if (!force)
xprintf(CGETS(26, 1,
"cannot stat %s. Please \"unset watch\".\n"),
_PATH_UTMP);
# ifdef BSDSIGS
(void) sigsetmask(omask);
# else
(void) sigrelse(SIGINT);
# endif
return;
}
if (stlast == sta.st_mtime) {
# ifdef BSDSIGS
(void) sigsetmask(omask);
# else
(void) sigrelse(SIGINT);
# endif
return;
}
stlast = sta.st_mtime;
if ((utmpfd = open(_PATH_UTMP, O_RDONLY)) < 0) {
if (!force)
xprintf(CGETS(26, 2,
"%s cannot be opened. Please \"unset watch\".\n"),
_PATH_UTMP);
# ifdef BSDSIGS
(void) sigsetmask(omask);
# else
(void) sigrelse(SIGINT);
# endif
return;
}
/*
* xterm clears the entire utmp entry - mark everyone on the status list
* OFFLINE or we won't notice X "logouts"
*/
for (wp = whohead.who_next; wp->who_next != NULL; wp = wp->who_next) {
wp->who_status = OFFLINE;
wp->who_time = 0;
}
/*
* Read in the utmp file, sort the entries, and update existing entries or
* add new entries to the status list.
*/
while (read(utmpfd, (char *) &utmp, sizeof utmp) == sizeof utmp) {
# ifdef DEAD_PROCESS
# ifndef IRIS4D
if (utmp.ut_type != USER_PROCESS)
continue;
# else
/* Why is that? Cause the utmp file is always corrupted??? */
if (utmp.ut_type != USER_PROCESS && utmp.ut_type != DEAD_PROCESS)
continue;
# endif /* IRIS4D */
# endif /* DEAD_PROCESS */
if (utmp.ut_name[0] == '\0' && utmp.ut_line[0] == '\0')
continue; /* completely void entry */
# ifdef DEAD_PROCESS
if (utmp.ut_type == DEAD_PROCESS && utmp.ut_line[0] == '\0')
continue;
# endif /* DEAD_PROCESS */
wp = whohead.who_next;
while (wp->who_next && (comp = strncmp(wp->who_tty, utmp.ut_line, UTLINLEN)) < 0)
wp = wp->who_next;/* find that tty! */
if (wp->who_next && comp == 0) { /* found the tty... */
# ifdef DEAD_PROCESS
if (utmp.ut_type == DEAD_PROCESS) {
wp->who_time = utmp.ut_time;
wp->who_status = OFFLINE;
}
else
# endif /* DEAD_PROCESS */
if (utmp.ut_name[0] == '\0') {
wp->who_time = utmp.ut_time;
wp->who_status = OFFLINE;
}
else if (strncmp(utmp.ut_name, wp->who_name, UTNAMLEN) == 0) {
/* someone is logged in */
wp->who_time = utmp.ut_time;
wp->who_status = 0; /* same guy */
}
else {
(void) strncpy(wp->who_new, utmp.ut_name, UTNAMLEN);
# ifdef UTHOST
# ifdef _SEQUENT_
host = ut_find_host(wp->who_tty);
if (host)
(void) strncpy(wp->who_host, host, UTHOSTLEN);
else
wp->who_host[0] = 0;
# else
(void) strncpy(wp->who_host, utmp.ut_host, UTHOSTLEN);
# endif
# endif /* UTHOST */
wp->who_time = utmp.ut_time;
if (wp->who_name[0] == '\0')
wp->who_status = ONLINE;
else
wp->who_status = CHANGED;
}
}
else { /* new tty in utmp */
wpnew = (struct who *) xcalloc(1, sizeof *wpnew);
(void) strncpy(wpnew->who_tty, utmp.ut_line, UTLINLEN);
# ifdef UTHOST
# ifdef _SEQUENT_
host = ut_find_host(wpnew->who_tty);
if (host)
(void) strncpy(wpnew->who_host, host, UTHOSTLEN);
else
wpnew->who_host[0] = 0;
# else
(void) strncpy(wpnew->who_host, utmp.ut_host, UTHOSTLEN);
# endif
# endif /* UTHOST */
wpnew->who_time = utmp.ut_time;
# ifdef DEAD_PROCESS
if (utmp.ut_type == DEAD_PROCESS)
wpnew->who_status = OFFLINE;
else
# endif /* DEAD_PROCESS */
if (utmp.ut_name[0] == '\0')
wpnew->who_status = OFFLINE;
else {
(void) strncpy(wpnew->who_new, utmp.ut_name, UTNAMLEN);
wpnew->who_status = ONLINE;
}
# ifdef WHODEBUG
debugwholist(wpnew, wp);
# endif /* WHODEBUG */
wpnew->who_next = wp; /* link in a new 'who' */
wpnew->who_prev = wp->who_prev;
wpnew->who_prev->who_next = wpnew;
wp->who_prev = wpnew; /* linked in now */
}
}
(void) close(utmpfd);
# if defined(UTHOST) && defined(_SEQUENT_)
endutent();
# endif
#endif /* !WINNT_NATIVE */
if (force || vp == NULL)
return;
/*
* The state of all logins is now known, so we can search the user's list
* of watchables to print the interesting ones.
*/
for (alldone = 0; !alldone && *vp != NULL && **vp != '\0' &&
*(vp + 1) != NULL && **(vp + 1) != '\0';
vp += 2) { /* args used in pairs... */
if (eq(*vp, STRany) && eq(*(vp + 1), STRany))
alldone = 1;
for (wp = whohead.who_next; wp->who_next != NULL; wp = wp->who_next) {
if (wp->who_status & ANNOUNCE ||
(!eq(STRany, vp[0]) &&
!Gmatch(str2short(wp->who_name), vp[0]) &&
!Gmatch(str2short(wp->who_new), vp[0])) ||
(!Gmatch(str2short(wp->who_tty), vp[1]) &&
!eq(STRany, vp[1])))
continue; /* entry doesn't qualify */
/* already printed or not right one to print */
if (wp->who_time == 0)/* utmp entry was cleared */
wp->who_time = watch_period;
if ((wp->who_status & OFFLINE) &&
(wp->who_name[0] != '\0')) {
if (!firsttime)
print_who(wp);
wp->who_name[0] = '\0';
wp->who_status |= ANNOUNCE;
continue;
}
if (wp->who_status & ONLINE) {
if (!firsttime)
print_who(wp);
(void) strcpy(wp->who_name, wp->who_new);
wp->who_status |= ANNOUNCE;
continue;
}
if (wp->who_status & CHANGED) {
if (!firsttime)
print_who(wp);
(void) strcpy(wp->who_name, wp->who_new);
wp->who_status |= ANNOUNCE;
continue;
}
}
}
#ifdef BSDSIGS
(void) sigsetmask(omask);
#else
(void) sigrelse(SIGINT);
#endif
}
#ifdef WHODEBUG
static void
debugwholist(new, wp)
register struct who *new, *wp;
{
register struct who *a;
a = whohead.who_next;
while (a->who_next != NULL) {
xprintf("%s/%s -> ", a->who_name, a->who_tty);
a = a->who_next;
}
xprintf("TAIL\n");
if (a != &whotail) {
xprintf(CGETS(26, 3, "BUG! last element is not whotail!\n"));
abort();
}
a = whotail.who_prev;
xprintf(CGETS(26, 4, "backward: "));
while (a->who_prev != NULL) {
xprintf("%s/%s -> ", a->who_name, a->who_tty);
a = a->who_prev;
}
xprintf("HEAD\n");
if (a != &whohead) {
xprintf(CGETS(26, 5, "BUG! first element is not whohead!\n"));
abort();
}
if (new)
xprintf(CGETS(26, 6, "new: %s/%s\n"), new->who_name, new->who_tty);
if (wp)
xprintf("wp: %s/%s\n", wp->who_name, wp->who_tty);
}
#endif /* WHODEBUG */
static void
print_who(wp)
struct who *wp;
{
#ifdef UTHOST
Char *cp = str2short(CGETS(26, 7, "%n has %a %l from %m."));
#else
Char *cp = str2short(CGETS(26, 8, "%n has %a %l."));
#endif /* UTHOST */
struct varent *vp = adrof(STRwho);
Char buf[BUFSIZE];
if (vp && vp->vec[0])
cp = vp->vec[0];
tprintf(FMT_WHO, buf, cp, BUFSIZE, NULL, wp->who_time, (ptr_t) wp);
for (cp = buf; *cp;)
xputchar(*cp++);
xputchar('\n');
} /* end print_who */
const char *
who_info(ptr, c, wbuf, wbufsiz)
ptr_t ptr;
int c;
char *wbuf;
size_t wbufsiz;
{
struct who *wp = (struct who *) ptr;
#ifdef UTHOST
char *wb = wbuf;
int flg;
char *pb;
#endif /* UTHOST */
switch (c) {
case 'n': /* user name */
switch (wp->who_status & STMASK) {
case ONLINE:
case CHANGED:
return wp->who_new;
case OFFLINE:
return wp->who_name;
default:
break;
}
break;
case 'a':
switch (wp->who_status & STMASK) {
case ONLINE:
return CGETS(26, 9, "logged on");
case OFFLINE:
return CGETS(26, 10, "logged off");
case CHANGED:
xsnprintf(wbuf, wbufsiz, CGETS(26, 11, "replaced %s on"),
wp->who_name);
return wbuf;
default:
break;
}
break;
#ifdef UTHOST
case 'm':
if (wp->who_host[0] == '\0')
return CGETS(26, 12, "local");
else {
/* the ':' stuff is for <host>:<display>.<screen> */
for (pb = wp->who_host, flg = Isdigit(*pb) ? '\0' : '.';
*pb != '\0' &&
(*pb != flg || ((pb = strchr(pb, ':')) != 0));
pb++) {
if (*pb == ':')
flg = '\0';
*wb++ = Isupper(*pb) ? Tolower(*pb) : *pb;
}
*wb = '\0';
return wbuf;
}
case 'M':
if (wp->who_host[0] == '\0')
return CGETS(26, 12, "local");
else {
for (pb = wp->who_host; *pb != '\0'; pb++)
*wb++ = Isupper(*pb) ? Tolower(*pb) : *pb;
*wb = '\0';
return wbuf;
}
#endif /* UTHOST */
case 'l':
return wp->who_tty;
default:
wbuf[0] = '%';
wbuf[1] = (char) c;
wbuf[2] = '\0';
return wbuf;
}
return NULL;
}
void
/*ARGSUSED*/
dolog(v, c)
Char **v;
struct command *c;
{
struct who *wp;
struct varent *vp;
USE(v);
USE(c);
vp = adrof(STRwatch); /* lint insists vp isn't used unless we */
if (vp == NULL) /* unless we assign it outside the if */
stderror(ERR_NOWATCH);
resetwatch();
wp = whohead.who_next;
while (wp->who_next != NULL) {
wp->who_name[0] = '\0';
wp = wp->who_next;
}
}
# ifdef UTHOST
size_t
utmphostsize()
{
return UTHOSTLEN;
}
char *
utmphost()
{
char *tty = short2str(varval(STRtty));
struct who *wp;
char *host = NULL;
watch_login(1);
for (wp = whohead.who_next; wp->who_next != NULL; wp = wp->who_next) {
if (strcmp(tty, wp->who_tty) == 0)
host = wp->who_host;
wp->who_name[0] = '\0';
}
resetwatch();
return host;
}
# endif /* UTHOST */
#ifdef WINNT_NATIVE
void add_to_who_list(name, mach_nm)
char *name;
char *mach_nm;
{
struct who *wp, *wpnew;
int comp = -1;
wp = whohead.who_next;
while (wp->who_next && (comp = strncmp(wp->who_tty,mach_nm,UTLINLEN)) < 0)
wp = wp->who_next;/* find that tty! */
if (wp->who_next && comp == 0) { /* found the tty... */
if (*name == '\0') {
wp->who_time = 0;
wp->who_status = OFFLINE;
}
else if (strncmp(name, wp->who_name, UTNAMLEN) == 0) {
/* someone is logged in */
wp->who_time = 0;
wp->who_status = 0; /* same guy */
}
else {
(void) strncpy(wp->who_new, name, UTNAMLEN);
wp->who_time = 0;
if (wp->who_name[0] == '\0')
wp->who_status = ONLINE;
else
wp->who_status = CHANGED;
}
}
else {
wpnew = (struct who *) xcalloc(1, sizeof *wpnew);
(void) strncpy(wpnew->who_tty, mach_nm, UTLINLEN);
wpnew->who_time = 0;
if (*name == '\0')
wpnew->who_status = OFFLINE;
else {
(void) strncpy(wpnew->who_new, name, UTNAMLEN);
wpnew->who_status = ONLINE;
}
#ifdef WHODEBUG
debugwholist(wpnew, wp);
#endif /* WHODEBUG */
wpnew->who_next = wp; /* link in a new 'who' */
wpnew->who_prev = wp->who_prev;
wpnew->who_prev->who_next = wpnew;
wp->who_prev = wpnew; /* linked in now */
}
}
#endif /* WINNT_NATIVE */
#endif /* HAVENOUTMP */
