704 lines
18 KiB
C
704 lines
18 KiB
C
/* $Header: /p/tcsh/cvsroot/tcsh/tc.who.c,v 3.51 2006/03/03 22:08:45 amold Exp $ */
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/*
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* tc.who.c: Watch logins and logouts...
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*/
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/*-
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* Copyright (c) 1980, 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "sh.h"
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RCSID("$tcsh: tc.who.c,v 3.51 2006/03/03 22:08:45 amold Exp $")
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#include "tc.h"
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#ifndef HAVENOUTMP
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/*
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* kfk 26 Jan 1984 - for login watch functions.
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*/
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#include <ctype.h>
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#ifdef HAVE_UTMPX_H
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# include <utmpx.h>
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/* I just redefine a few words here. Changing every occurrence below
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* seems like too much of work. All UTMP functions have equivalent
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* UTMPX counterparts, so they can be added all here when needed.
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* Kimmo Suominen, Oct 14 1991
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*/
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# if defined(__UTMPX_FILE) && !defined(UTMPX_FILE)
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# define TCSH_PATH_UTMP __UTMPX_FILE
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# elif defined(_PATH_UTMPX)
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# define TCSH_PATH_UTMP _PATH_UTMPX
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# elif defined(UTMPX_FILE)
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# define TCSH_PATH_UTMP UTMPX_FILE
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# endif /* __UTMPX_FILE && !UTMPX_FILE */
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# ifdef TCSH_PATH_UTMP
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# define utmp utmpx
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# if defined(HAVE_STRUCT_UTMP_UT_TV)
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# define ut_time ut_tv.tv_sec
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# elif defined(HAVE_STRUCT_UTMP_UT_XTIME)
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# define ut_time ut_xtime
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# endif
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# ifdef HAVE_STRUCT_UTMP_UT_USER
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# define ut_name ut_user
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# endif
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# ifdef HAVE_GETUTENT
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# define getutent getutxent
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# define setutent setutxent
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# define endutent endutxent
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# endif /* HAVE_GETUTENT */
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# else
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# ifdef HAVE_UTMP_H
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# include <utmp.h>
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# endif /* WINNT_NATIVE */
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# endif /* TCSH_PATH_UTMP */
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#else /* !HAVE_UTMPX_H */
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# ifdef HAVE_UTMP_H
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# include <utmp.h>
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# endif /* WINNT_NATIVE */
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#endif /* HAVE_UTMPX_H */
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#ifndef BROKEN_CC
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# define UTNAMLEN sizeof(((struct utmp *) 0)->ut_name)
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# define UTLINLEN sizeof(((struct utmp *) 0)->ut_line)
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# ifdef HAVE_STRUCT_UTMP_UT_HOST
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# ifdef _SEQUENT_
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# define UTHOSTLEN 100
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# else
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# define UTHOSTLEN sizeof(((struct utmp *) 0)->ut_host)
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# endif
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# endif /* HAVE_STRUCT_UTMP_UT_HOST */
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#else
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/* give poor cc a little help if it needs it */
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struct utmp __ut;
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# define UTNAMLEN sizeof(__ut.ut_name)
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# define UTLINLEN sizeof(__ut.ut_line)
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# ifdef HAVE_STRUCT_UTMP_UT_HOST
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# ifdef _SEQUENT_
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# define UTHOSTLEN 100
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# else
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# define UTHOSTLEN sizeof(__ut.ut_host)
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# endif
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# endif /* HAVE_STRUCT_UTMP_UT_HOST */
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#endif /* BROKEN_CC */
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#ifndef TCSH_PATH_UTMP
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# ifdef UTMP_FILE
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# define TCSH_PATH_UTMP UTMP_FILE
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# elif defined(_PATH_UTMP)
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# define TCSH_PATH_UTMP _PATH_UTMP
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# else
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# define TCSH_PATH_UTMP "/etc/utmp"
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# endif /* UTMP_FILE */
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#endif /* TCSH_PATH_UTMP */
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struct who {
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struct who *who_next;
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struct who *who_prev;
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char who_name[UTNAMLEN + 1];
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char who_new[UTNAMLEN + 1];
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char who_tty[UTLINLEN + 1];
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#ifdef HAVE_STRUCT_UTMP_UT_HOST
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char who_host[UTHOSTLEN + 1];
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#endif /* HAVE_STRUCT_UTMP_UT_HOST */
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time_t who_time;
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int who_status;
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};
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static struct who whohead, whotail;
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static time_t watch_period = 0;
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static time_t stlast = 0;
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#ifdef WHODEBUG
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static void debugwholist (struct who *, struct who *);
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#endif
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static void print_who (struct who *);
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#define ONLINE 01
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#define OFFLINE 02
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#define CHANGED 04
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#define STMASK 07
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#define ANNOUNCE 010
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#define CLEARED 020
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/*
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* Karl Kleinpaste, 26 Jan 1984.
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* Initialize the dummy tty list for login watch.
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* This dummy list eliminates boundary conditions
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* when doing pointer-chase searches.
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*/
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void
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initwatch(void)
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{
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whohead.who_next = &whotail;
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whotail.who_prev = &whohead;
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stlast = 1;
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#ifdef WHODEBUG
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debugwholist(NULL, NULL);
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#endif /* WHODEBUG */
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}
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void
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resetwatch(void)
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{
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watch_period = 0;
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stlast = 0;
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}
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/*
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* Karl Kleinpaste, 26 Jan 1984.
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* Watch /etc/utmp for login/logout changes.
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*/
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void
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watch_login(int force)
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{
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int comp = -1, alldone;
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int firsttime = stlast == 1;
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#ifdef HAVE_GETUTENT
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struct utmp *uptr;
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#else
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int utmpfd;
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#endif
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struct utmp utmp;
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struct who *wp, *wpnew;
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struct varent *v;
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Char **vp = NULL;
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time_t t, interval = MAILINTVL;
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struct stat sta;
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#if defined(HAVE_STRUCT_UTMP_UT_HOST) && defined(_SEQUENT_)
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char *host, *ut_find_host();
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#endif
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#ifdef WINNT_NATIVE
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static int ncbs_posted = 0;
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USE(utmp);
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USE(utmpfd);
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USE(sta);
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USE(wpnew);
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#endif /* WINNT_NATIVE */
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/* stop SIGINT, lest our login list get trashed. */
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pintr_disabled++;
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cleanup_push(&pintr_disabled, disabled_cleanup);
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v = adrof(STRwatch);
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if ((v == NULL || v->vec == NULL) && !force) {
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cleanup_until(&pintr_disabled);
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return; /* no names to watch */
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}
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if (!force) {
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trim(vp = v->vec);
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if (blklen(vp) % 2) /* odd # args: 1st == # minutes. */
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interval = (number(*vp)) ? (getn(*vp++) * 60) : MAILINTVL;
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}
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else
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interval = 0;
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(void) time(&t);
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#ifdef WINNT_NATIVE
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/*
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* Since NCB_ASTATs take time, start em async at least 90 secs
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* before we are due -amol 6/5/97
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*/
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if (!ncbs_posted) {
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time_t tdiff = t - watch_period;
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if (!watch_period || ((tdiff > 0) && (tdiff > (interval - 90)))) {
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start_ncbs(vp);
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ncbs_posted = 1;
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}
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}
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#endif /* WINNT_NATIVE */
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if (t - watch_period < interval) {
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cleanup_until(&pintr_disabled);
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return; /* not long enough yet... */
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}
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watch_period = t;
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#ifdef WINNT_NATIVE
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ncbs_posted = 0;
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#else /* !WINNT_NATIVE */
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/*
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* From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
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* Don't open utmp all the time, stat it first...
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*/
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if (stat(TCSH_PATH_UTMP, &sta)) {
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if (!force)
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xprintf(CGETS(26, 1,
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"cannot stat %s. Please \"unset watch\".\n"),
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TCSH_PATH_UTMP);
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cleanup_until(&pintr_disabled);
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return;
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}
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if (stlast == sta.st_mtime) {
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cleanup_until(&pintr_disabled);
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return;
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}
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stlast = sta.st_mtime;
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#ifdef HAVE_GETUTENT
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setutent();
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#else
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if ((utmpfd = xopen(TCSH_PATH_UTMP, O_RDONLY|O_LARGEFILE)) < 0) {
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if (!force)
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xprintf(CGETS(26, 2,
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"%s cannot be opened. Please \"unset watch\".\n"),
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TCSH_PATH_UTMP);
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cleanup_until(&pintr_disabled);
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return;
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}
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cleanup_push(&utmpfd, open_cleanup);
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#endif
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/*
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* xterm clears the entire utmp entry - mark everyone on the status list
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* OFFLINE or we won't notice X "logouts"
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*/
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for (wp = whohead.who_next; wp->who_next != NULL; wp = wp->who_next)
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wp->who_status = OFFLINE | CLEARED;
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/*
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* Read in the utmp file, sort the entries, and update existing entries or
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* add new entries to the status list.
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*/
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#ifdef HAVE_GETUTENT
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while ((uptr = getutent()) != NULL) {
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memcpy(&utmp, uptr, sizeof (utmp));
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#else
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while (xread(utmpfd, &utmp, sizeof utmp) == sizeof utmp) {
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#endif
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# ifdef DEAD_PROCESS
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# ifndef IRIS4D
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if (utmp.ut_type != USER_PROCESS)
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continue;
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# else
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/* Why is that? Cause the utmp file is always corrupted??? */
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if (utmp.ut_type != USER_PROCESS && utmp.ut_type != DEAD_PROCESS)
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continue;
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# endif /* IRIS4D */
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# endif /* DEAD_PROCESS */
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if (utmp.ut_name[0] == '\0' && utmp.ut_line[0] == '\0')
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continue; /* completely void entry */
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# ifdef DEAD_PROCESS
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if (utmp.ut_type == DEAD_PROCESS && utmp.ut_line[0] == '\0')
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continue;
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# endif /* DEAD_PROCESS */
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wp = whohead.who_next;
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while (wp->who_next && (comp = strncmp(wp->who_tty, utmp.ut_line, UTLINLEN)) < 0)
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wp = wp->who_next;/* find that tty! */
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if (wp->who_next && comp == 0) { /* found the tty... */
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if (utmp.ut_time < wp->who_time)
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continue;
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# ifdef DEAD_PROCESS
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if (utmp.ut_type == DEAD_PROCESS) {
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wp->who_time = utmp.ut_time;
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wp->who_status = OFFLINE;
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}
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else
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# endif /* DEAD_PROCESS */
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if (utmp.ut_name[0] == '\0') {
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wp->who_time = utmp.ut_time;
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wp->who_status = OFFLINE;
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}
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else if (strncmp(utmp.ut_name, wp->who_name, UTNAMLEN) == 0) {
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/* someone is logged in */
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wp->who_time = utmp.ut_time;
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wp->who_status = ONLINE | ANNOUNCE; /* same guy */
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}
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else {
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(void) strncpy(wp->who_new, utmp.ut_name, UTNAMLEN);
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# ifdef HAVE_STRUCT_UTMP_UT_HOST
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# ifdef _SEQUENT_
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host = ut_find_host(wp->who_tty);
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if (host)
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(void) strncpy(wp->who_host, host, UTHOSTLEN);
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else
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wp->who_host[0] = 0;
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# else
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(void) strncpy(wp->who_host, utmp.ut_host, UTHOSTLEN);
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# endif
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# endif /* HAVE_STRUCT_UTMP_UT_HOST */
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wp->who_time = utmp.ut_time;
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if (wp->who_name[0] == '\0')
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wp->who_status = ONLINE;
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else
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wp->who_status = CHANGED;
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}
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}
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else { /* new tty in utmp */
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wpnew = xcalloc(1, sizeof *wpnew);
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(void) strncpy(wpnew->who_tty, utmp.ut_line, UTLINLEN);
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# ifdef HAVE_STRUCT_UTMP_UT_HOST
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# ifdef _SEQUENT_
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host = ut_find_host(wpnew->who_tty);
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if (host)
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(void) strncpy(wpnew->who_host, host, UTHOSTLEN);
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else
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wpnew->who_host[0] = 0;
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# else
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(void) strncpy(wpnew->who_host, utmp.ut_host, UTHOSTLEN);
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# endif
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# endif /* HAVE_STRUCT_UTMP_UT_HOST */
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wpnew->who_time = utmp.ut_time;
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# ifdef DEAD_PROCESS
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if (utmp.ut_type == DEAD_PROCESS)
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wpnew->who_status = OFFLINE;
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else
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# endif /* DEAD_PROCESS */
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if (utmp.ut_name[0] == '\0')
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wpnew->who_status = OFFLINE;
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else {
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(void) strncpy(wpnew->who_new, utmp.ut_name, UTNAMLEN);
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wpnew->who_status = ONLINE;
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}
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# ifdef WHODEBUG
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debugwholist(wpnew, wp);
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# endif /* WHODEBUG */
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wpnew->who_next = wp; /* link in a new 'who' */
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wpnew->who_prev = wp->who_prev;
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wpnew->who_prev->who_next = wpnew;
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wp->who_prev = wpnew; /* linked in now */
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}
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}
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#ifdef HAVE_GETUTENT
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endutent();
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#else
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cleanup_until(&utmpfd);
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#endif
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# if defined(HAVE_STRUCT_UTMP_UT_HOST) && defined(_SEQUENT_)
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endutent();
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# endif
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#endif /* !WINNT_NATIVE */
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if (force || vp == NULL) {
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cleanup_until(&pintr_disabled);
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return;
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}
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/*
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* The state of all logins is now known, so we can search the user's list
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* of watchables to print the interesting ones.
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*/
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for (alldone = 0; !alldone && *vp != NULL && **vp != '\0' &&
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*(vp + 1) != NULL && **(vp + 1) != '\0';
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vp += 2) { /* args used in pairs... */
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if (eq(*vp, STRany) && eq(*(vp + 1), STRany))
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alldone = 1;
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for (wp = whohead.who_next; wp->who_next != NULL; wp = wp->who_next) {
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if (wp->who_status & ANNOUNCE ||
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(!eq(STRany, vp[0]) &&
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!Gmatch(str2short(wp->who_name), vp[0]) &&
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!Gmatch(str2short(wp->who_new), vp[0])) ||
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(!Gmatch(str2short(wp->who_tty), vp[1]) &&
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!eq(STRany, vp[1])))
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continue; /* entry doesn't qualify */
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/* already printed or not right one to print */
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if (wp->who_status & CLEARED) {/* utmp entry was cleared */
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wp->who_time = watch_period;
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wp->who_status &= ~CLEARED;
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}
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if ((wp->who_status & OFFLINE) &&
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(wp->who_name[0] != '\0')) {
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if (!firsttime)
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print_who(wp);
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wp->who_name[0] = '\0';
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wp->who_status |= ANNOUNCE;
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continue;
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}
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if (wp->who_status & ONLINE) {
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if (!firsttime)
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print_who(wp);
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(void) strcpy(wp->who_name, wp->who_new);
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wp->who_status |= ANNOUNCE;
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continue;
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}
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if (wp->who_status & CHANGED) {
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if (!firsttime)
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print_who(wp);
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(void) strcpy(wp->who_name, wp->who_new);
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wp->who_status |= ANNOUNCE;
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continue;
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}
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}
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}
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cleanup_until(&pintr_disabled);
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}
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#ifdef WHODEBUG
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static void
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debugwholist(struct who *new, struct who *wp)
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{
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struct who *a;
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a = whohead.who_next;
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while (a->who_next != NULL) {
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xprintf("%s/%s -> ", a->who_name, a->who_tty);
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a = a->who_next;
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}
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xprintf("TAIL\n");
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if (a != &whotail) {
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xprintf(CGETS(26, 3, "BUG! last element is not whotail!\n"));
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abort();
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}
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a = whotail.who_prev;
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xprintf(CGETS(26, 4, "backward: "));
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while (a->who_prev != NULL) {
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xprintf("%s/%s -> ", a->who_name, a->who_tty);
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a = a->who_prev;
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}
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xprintf("HEAD\n");
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if (a != &whohead) {
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xprintf(CGETS(26, 5, "BUG! first element is not whohead!\n"));
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abort();
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}
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if (new)
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xprintf(CGETS(26, 6, "new: %s/%s\n"), new->who_name, new->who_tty);
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if (wp)
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xprintf("wp: %s/%s\n", wp->who_name, wp->who_tty);
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}
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#endif /* WHODEBUG */
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static void
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print_who(struct who *wp)
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{
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#ifdef HAVE_STRUCT_UTMP_UT_HOST
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Char *cp = str2short(CGETS(26, 7, "%n has %a %l from %m."));
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#else
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Char *cp = str2short(CGETS(26, 8, "%n has %a %l."));
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#endif /* HAVE_STRUCT_UTMP_UT_HOST */
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struct varent *vp = adrof(STRwho);
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Char *str;
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if (vp && vp->vec && vp->vec[0])
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cp = vp->vec[0];
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str = tprintf(FMT_WHO, cp, NULL, wp->who_time, wp);
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cleanup_push(str, xfree);
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for (cp = str; *cp;)
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xputwchar(*cp++);
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cleanup_until(str);
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xputchar('\n');
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} /* end print_who */
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char *
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who_info(ptr_t ptr, int c)
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{
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struct who *wp = ptr;
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char *wbuf;
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#ifdef HAVE_STRUCT_UTMP_UT_HOST
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char *wb;
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int flg;
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char *pb;
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#endif /* HAVE_STRUCT_UTMP_UT_HOST */
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switch (c) {
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case 'n': /* user name */
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switch (wp->who_status & STMASK) {
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case ONLINE:
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case CHANGED:
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return strsave(wp->who_new);
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case OFFLINE:
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return strsave(wp->who_name);
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default:
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break;
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}
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break;
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case 'a':
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switch (wp->who_status & STMASK) {
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case ONLINE:
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return strsave(CGETS(26, 9, "logged on"));
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case OFFLINE:
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return strsave(CGETS(26, 10, "logged off"));
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case CHANGED:
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return xasprintf(CGETS(26, 11, "replaced %s on"), wp->who_name);
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default:
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break;
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}
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break;
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#ifdef HAVE_STRUCT_UTMP_UT_HOST
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case 'm':
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if (wp->who_host[0] == '\0')
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return strsave(CGETS(26, 12, "local"));
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else {
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pb = wp->who_host;
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wbuf = xmalloc(strlen(pb) + 1);
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wb = wbuf;
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/* the ':' stuff is for <host>:<display>.<screen> */
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for (flg = isdigit((unsigned char)*pb) ? '\0' : '.';
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*pb != '\0' && (*pb != flg || ((pb = strchr(pb, ':')) != 0));
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pb++) {
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if (*pb == ':')
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flg = '\0';
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*wb++ = isupper((unsigned char)*pb) ?
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tolower((unsigned char)*pb) : *pb;
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}
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*wb = '\0';
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return wbuf;
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}
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case 'M':
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if (wp->who_host[0] == '\0')
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return strsave(CGETS(26, 12, "local"));
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else {
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pb = wp->who_host;
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wbuf = xmalloc(strlen(pb) + 1);
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wb = wbuf;
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for (; *pb != '\0'; pb++)
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*wb++ = isupper((unsigned char)*pb) ?
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tolower((unsigned char)*pb) : *pb;
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*wb = '\0';
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return wbuf;
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}
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#endif /* HAVE_STRUCT_UTMP_UT_HOST */
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case 'l':
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return strsave(wp->who_tty);
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default:
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wbuf = xmalloc(3);
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wbuf[0] = '%';
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wbuf[1] = (char) c;
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wbuf[2] = '\0';
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return wbuf;
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}
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return NULL;
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}
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void
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/*ARGSUSED*/
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dolog(Char **v, struct command *c)
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{
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struct who *wp;
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struct varent *vp;
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USE(v);
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USE(c);
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vp = adrof(STRwatch); /* lint insists vp isn't used unless we */
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if (vp == NULL) /* unless we assign it outside the if */
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stderror(ERR_NOWATCH);
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resetwatch();
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wp = whohead.who_next;
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while (wp->who_next != NULL) {
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wp->who_name[0] = '\0';
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wp = wp->who_next;
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}
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}
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# ifdef HAVE_STRUCT_UTMP_UT_HOST
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size_t
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utmphostsize(void)
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{
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return UTHOSTLEN;
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}
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char *
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utmphost(void)
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{
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char *tty = short2str(varval(STRtty));
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struct who *wp;
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char *host = NULL;
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watch_login(1);
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for (wp = whohead.who_next; wp->who_next != NULL; wp = wp->who_next) {
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if (strcmp(tty, wp->who_tty) == 0)
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host = wp->who_host;
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wp->who_name[0] = '\0';
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}
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resetwatch();
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return host;
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}
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# endif /* HAVE_STRUCT_UTMP_UT_HOST */
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#ifdef WINNT_NATIVE
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void add_to_who_list(name, mach_nm)
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char *name;
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char *mach_nm;
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{
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|
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struct who *wp, *wpnew;
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int comp = -1;
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wp = whohead.who_next;
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while (wp->who_next && (comp = strncmp(wp->who_tty,mach_nm,UTLINLEN)) < 0)
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wp = wp->who_next;/* find that tty! */
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if (wp->who_next && comp == 0) { /* found the tty... */
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if (*name == '\0') {
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wp->who_time = 0;
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wp->who_status = OFFLINE;
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}
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else if (strncmp(name, wp->who_name, UTNAMLEN) == 0) {
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/* someone is logged in */
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wp->who_time = 0;
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wp->who_status = 0; /* same guy */
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}
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else {
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(void) strncpy(wp->who_new, name, UTNAMLEN);
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wp->who_time = 0;
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if (wp->who_name[0] == '\0')
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wp->who_status = ONLINE;
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else
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wp->who_status = CHANGED;
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}
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}
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else {
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wpnew = xcalloc(1, sizeof *wpnew);
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(void) strncpy(wpnew->who_tty, mach_nm, UTLINLEN);
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wpnew->who_time = 0;
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if (*name == '\0')
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wpnew->who_status = OFFLINE;
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else {
|
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(void) strncpy(wpnew->who_new, name, UTNAMLEN);
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wpnew->who_status = ONLINE;
|
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}
|
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#ifdef WHODEBUG
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debugwholist(wpnew, wp);
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#endif /* WHODEBUG */
|
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wpnew->who_next = wp; /* link in a new 'who' */
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wpnew->who_prev = wp->who_prev;
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wpnew->who_prev->who_next = wpnew;
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wp->who_prev = wpnew; /* linked in now */
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}
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}
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#endif /* WINNT_NATIVE */
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#endif /* HAVENOUTMP */
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