425 lines
9.2 KiB
C
425 lines
9.2 KiB
C
/* This file is part of the Project Athena Zephyr Notification System.
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* It contains code for the "zleave" command.
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*
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* Created by: David Jedlinsky
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*
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* $Id$
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*
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* Copyright (c) 1987,1988 by the Massachusetts Institute of Technology.
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* For copying and distribution information, see the file
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* "mit-copyright.h".
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*/
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#include <sysdep.h>
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#include <zephyr/mit-copyright.h>
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#include <zephyr/zephyr.h>
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#ifndef lint
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static const char rcsid_zlocate_c[] = "$Id$";
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#endif /* lint */
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/*
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* Copyright (c) 1980 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 are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of California at Berkeley. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific written prior permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1980 Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#define MESSAGE_CLASS "MESSAGE"
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#define INSTANCE "LEAVE"
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/*
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* zleave [[+]hhmm [ -m "Reminder Message" ]]
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* or
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* zleave can[cel]
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*
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* Reminds you when you have to leave.
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* Leave prompts for input and goes away if you hit return.
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* Messages are sent through Zephyr. Subscriptions are handled automagically.
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* It nags you like a mother hen.
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*/
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char origlogin[20];
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char tempfile[40];
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char *whenleave;
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char *reminder_message = NULL;
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char buff[100];
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int use_zephyr=1, oldpid;
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void usage(void);
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void doalarm(long);
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void bother(long, char *);
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void delay(long);
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int gethm(char *, int *, int*);
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int
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main(int argc,
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char **argv)
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{
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time_t now;
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long when, diff;
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int hours, minutes;
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char *cp;
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FILE *fp;
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struct tm *nv;
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int port, c;
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ZSubscription_t sub;
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if (ZInitialize() != ZERR_NONE) {
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fprintf(stderr,"No Zephyr! Will write directly to terminal.\n");
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use_zephyr = 0;
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}
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(void) sprintf(tempfile, "/tmp/zleave.%d", (int) getuid());
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if (use_zephyr) {
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if ((port = ZGetWGPort()) == -1) {
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fprintf(stderr,
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"Can't find WindowGram subscription port.\n");
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fprintf(stderr,"Will write directly to terminal.\n");
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use_zephyr = 0;
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} else {
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sub.zsub_class = MESSAGE_CLASS;
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sub.zsub_classinst = INSTANCE;
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sub.zsub_recipient = ZGetSender();
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if (ZSubscribeToSansDefaults(&sub,1,(u_short)port)
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!= ZERR_NONE) {
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fprintf(stderr,
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"Subscription error! Writing to your terminal...\n");
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use_zephyr = 0;
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}
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}
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}
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if (!use_zephyr) {
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if ((cp = getlogin()) == NULL) {
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fputs("leave: You are not logged in.\n", stderr);
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exit(1);
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}
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(void) strcpy(origlogin, cp);
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}
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c = 1;
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while ((c<argc) && (! reminder_message))
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if (!strcmp(argv[c++],"-m")) {
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if (argv[c])
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reminder_message = argv[c];
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else
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usage();
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}
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if (!reminder_message)
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reminder_message = "";
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if (argc < 2) {
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printf("When do you have to leave? ");
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(void) fflush(stdout);
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buff[read(0, buff, sizeof buff)] = 0;
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cp = buff;
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} else
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cp = argv[1];
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if (*cp == '\n')
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exit(0);
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if (*cp == '+') {
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cp++;
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if (!gethm(cp, &hours, &minutes))
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usage();
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if (minutes < 0 || minutes > 59)
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usage();
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diff = 60*hours+minutes;
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doalarm(diff);
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exit(0);
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}
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if (!strcmp(cp, "cancel") || !strcmp(cp, "can")) {
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if (!(fp = fopen(tempfile,"r"))) {
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printf("No zleave is currently running.\n");
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exit(0);
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}
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if (fscanf(fp, "%d", &oldpid) != 1) {
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printf("The zleave pid file is corrupted.\n");
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(void) fclose(fp);
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exit(0);
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}
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(void) fclose(fp);
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if (kill(oldpid,9))
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printf("No zleave is currently running.\n");
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(void) unlink(tempfile);
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exit(0);
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}
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if (!gethm(cp, &hours, &minutes))
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usage();
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if (hours > 12)
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hours -= 12;
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if (hours == 12)
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hours = 0;
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if (hours < 0 || hours > 12 || minutes < 0 || minutes > 59)
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usage();
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(void) time(&now);
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nv = localtime(&now);
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when = 60*hours+minutes;
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if (nv->tm_hour > 12)
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nv->tm_hour -= 12; /* do am/pm bit */
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now = 60 * nv->tm_hour + nv->tm_min;
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diff = when - now;
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while (diff < 0)
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diff += 12*60;
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if (diff > 11*60) {
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fprintf(stderr, "That time has already passed!\n");
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exit(1);
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}
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doalarm(diff);
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exit(0);
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}
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void
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usage(void)
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{
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fprintf(stderr, "usage: zleave [[+]hhmm [-m \"Reminder Message\"]]\n\
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\tor: zleave can[cel]\n");
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exit(1);
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}
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int
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gethm(char *cp,
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int *hp,
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int *mp)
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{
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char c;
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int tod;
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tod = 0;
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while ((c = *cp++) != '\0') {
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if (!isdigit(c))
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return(0);
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tod = tod * 10 + (c - '0');
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}
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*hp = tod / 100;
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*mp = tod % 100;
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return(1);
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}
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void
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doalarm(long nmins)
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{
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time_t daytime;
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char *msg1, *msg2, *msg3, *msg4;
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register int i;
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long slp1, slp2, slp3, slp4;
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long seconds, gseconds;
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FILE *fp;
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#ifdef _POSIX_VERSION
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struct sigaction sa;
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#endif
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seconds = 60 * nmins;
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if (seconds <= 0)
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seconds = 1;
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gseconds = seconds;
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msg1 = "You have to leave in 5 minutes";
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if (seconds <= 60*5) {
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slp1 = 0;
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} else {
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slp1 = seconds - 60*5;
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seconds = 60*5;
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}
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msg2 = "Just one more minute!";
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if (seconds <= 60) {
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slp2 = 0;
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} else {
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slp2 = seconds - 60;
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seconds = 60;
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}
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msg3 = "Time to leave!";
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slp3 = seconds;
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msg4 = "You're going to be late!";
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slp4 = 60L;
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(void) time(&daytime);
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daytime += gseconds;
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whenleave = ctime(&daytime);
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fp = fopen(tempfile,"r");
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if (fp) {
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if (fscanf(fp, "%d", &oldpid) == 1)
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if (!kill(oldpid,9))
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printf("Old zleave process killed.\n");
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(void) fclose(fp);
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}
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printf("Alarm set for %s", whenleave);
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/* Subscribe to MESSAGE.LEAVE here */
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switch(fork()) {
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case -1:
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perror("fork");
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exit(-1);
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break;
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case 0:
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break;
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default:
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exit(0);
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break;
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}
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if (!(fp = fopen(tempfile, "w")))
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fprintf(stderr, "Cannot open pid file.\n");
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else {
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fprintf(fp, "%d\n", getpid());
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if (fclose(fp) == EOF)
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(void) perror("fclose on pid file");
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}
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#ifdef _POSIX_VERSION
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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sa.sa_handler = SIG_IGN;
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sigaction(SIGINT, &sa, (struct sigaction *)0);
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sigaction(SIGQUIT, &sa, (struct sigaction *)0);
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sigaction(SIGTERM, &sa, (struct sigaction *)0);
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sigaction(SIGTTOU, &sa, (struct sigaction *)0);
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#else
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(void) signal(SIGINT, SIG_IGN);
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(void) signal(SIGQUIT, SIG_IGN);
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(void) signal(SIGTERM, SIG_IGN);
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(void) signal(SIGTTOU, SIG_IGN);
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#endif
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if (slp1)
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bother(slp1, msg1);
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if (slp2)
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bother(slp2, msg2);
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bother(slp3, msg3);
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for (i = 0; i < 10; i++)
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bother(slp4, msg4);
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bother(0L, "That was the last time I'll tell you. Bye.");
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(void) unlink(tempfile);
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exit(0);
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}
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void
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bother(long slp,
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char *msg)
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{
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ZNotice_t notice;
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ZNotice_t retnotice;
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int retval;
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char *real_message;
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delay(slp);
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if (use_zephyr) {
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real_message = (char *) malloc(strlen(msg) +
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strlen(reminder_message) + 3);
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if (real_message == NULL) {
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fprintf (stderr, "zleave: out of memory\n");
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exit (1);
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}
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sprintf(real_message,"%c%s\n%s",'\0',msg,reminder_message);
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(void) memset((char *)¬ice, 0, sizeof(notice));
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notice.z_kind = ACKED;
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notice.z_port = 0;
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notice.z_charset = ZCHARSET_UNKNOWN;
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notice.z_class = MESSAGE_CLASS;
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notice.z_class_inst = INSTANCE;
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notice.z_recipient = ZGetSender();
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notice.z_opcode = "";
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notice.z_sender = (char *) 0;
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notice.z_default_format = "\n$2";
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notice.z_message = real_message;
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/* +3: initial null, newline, final null */
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notice.z_message_len = strlen(msg)+strlen(reminder_message)+3;
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if (ZSendNotice(¬ice, ZAUTH) != ZERR_NONE) {
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printf("\7\7\7%s\n%s", msg, reminder_message);
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use_zephyr = 0;
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} else
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if ((retval = ZIfNotice(&retnotice, (struct sockaddr_in *) 0,
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ZCompareUIDPred,
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(char *)¬ice.z_uid)) != ZERR_NONE) {
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fprintf(stderr,
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"zleave: %s while waiting for acknowledgement\n",
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error_message(retval));
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use_zephyr = 0;
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} else
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if (retnotice.z_kind == SERVNAK) {
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fprintf(stderr,
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"zleave: authorization failure while sending\n");
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use_zephyr = 0;
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} else
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if (retnotice.z_kind != SERVACK || !retnotice.z_message_len) {
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fprintf(stderr, "zleave: Detected server failure while receiving acknowledgement\n");
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use_zephyr = 0;
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} else
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if (strcmp(retnotice.z_message, ZSRVACK_SENT)) {
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/* it wasn't sent */
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exit(0);
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}
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if (!use_zephyr)
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exit(1);
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ZFreeNotice(&retnotice);
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free(real_message);
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} else
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#ifdef __STDC__
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printf("\a\a\a%s\n%s", msg, reminder_message);
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#else
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printf("\7\7\7%s\n%s", msg, reminder_message);
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#endif
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}
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/*
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* delay is like sleep but does it in 100 sec pieces and
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* knows what zero means.
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*/
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void
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delay(long secs)
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{
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long n;
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register char *l;
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while (secs > 0) {
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n = 100;
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if (secs < n)
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n = secs;
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secs -= n;
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if (n > 0)
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sleep((unsigned) n);
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if (!use_zephyr) {
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l = getlogin();
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if (l == NULL)
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exit(0);
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if (strcmp(origlogin, l) != 0)
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exit(0);
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}
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}
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}
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#ifndef HAVE_GETLOGIN
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char *getlogin() {
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#include <utmp.h>
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static struct utmp ubuf;
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int ufd;
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ufd = open("/etc/utmp",0);
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seek(ufd, ttyn(0)*sizeof(ubuf), 0);
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read(ufd, &ubuf, sizeof(ubuf));
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ubuf.ut_name[sizeof(ubuf.ut_name)] = 0;
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return(&ubuf.ut_name);
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}
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#endif
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