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/* This file is part of the Project Athena Zephyr Notification System.
* It is one of the source files comprising zwgc, the Zephyr WindowGram
* client.
*
* Created by: Marc Horowitz <marc@athena.mit.edu>
*
* $Id$
*
* Copyright (c) 1989 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include <sysdep.h>
#if (!defined(lint) && !defined(SABER))
static const char rcsid_zephyr_c[] = "$Id$";
#endif
#include <zephyr/mit-copyright.h>
/****************************************************************************/
/* */
/* Module containing code dealing with zephyr: */
/* */
/****************************************************************************/
#include <zephyr/zephyr.h>
#include <sys/socket.h>
#include "new_string.h"
#include "zephyr.h"
#include "error.h"
#include "mux.h"
#include "subscriptions.h"
#include "variables.h"
#include "pointer.h"
#include "main.h"
#ifndef X_DISPLAY_MISSING
#include "X_driver.h"
#endif
#ifdef CMU_ZWGCPLUS
#include "plus.h"
#endif
#ifdef DEBUG
extern int zwgc_debug;
#endif /* DEBUG */
static int zephyr_inited = 0;
static unsigned short zephyr_port = 0;
/*
* Internal Routine:
*
* string get_zwgc_port_number_filename()
* Effects: Returns the filename that the zwgc port # is/should be
* stored in, based on the user's uid & the environment
* variable WGFILE. The returned string points into a
* static buffer that may change on further calls to this
* routine or getenv. The returned string should not be
* modified in any way.
*/
static string
get_zwgc_port_number_filename(void)
{
static char buffer[40];
char *temp;
temp = getenv("WGFILE");
if (temp)
return(temp);
else {
sprintf(buffer, "/tmp/wg.%d", getuid());
return(buffer);
}
}
/*
* Write out the port number to the wg file.
*/
void
write_wgfile(void)
{
char *name = get_zwgc_port_number_filename();
FILE *port_file;
port_file = fopen(name, "w");
if (port_file) {
fprintf(port_file, "%d\n", zephyr_port);
fclose(port_file);
} else {
fprintf(stderr, "zwgc: error while opening %s for writing: ", name);
perror("");
}
}
/*
*
*/
struct notice_handler_ptr {
void (*notice_handler)(ZNotice_t *);
};
static void
handle_zephyr_input(struct notice_handler_ptr *nhp)
{
ZNotice_t *notice;
struct sockaddr_in from;
int complete_packets_ready;
for (;;) {
errno = 0;
if ( (complete_packets_ready=ZPending()) < 0 )
FATAL_TRAP( errno, "while calling ZPending()" );
if (complete_packets_ready==0)
return;
notice = malloc(sizeof(ZNotice_t));
TRAP( ZReceiveNotice(notice, &from), "while getting zephyr notice" );
if (!error_code) {
notice->z_auth = ZCheckAuthentication(notice, &from);
nhp->notice_handler(notice);
}
#ifdef CMU_ZWGCPLUS
if (get_list_refcount(notice) <= 0) {
/* no windows created */
if (!get_notice_fake(notice))
list_del_notice(notice);
}
#endif
}
}
/*
*
*/
void zephyr_init(void (*notice_handler)(ZNotice_t *))
{
struct notice_handler_ptr *nhp;
char *temp;
char *exposure;
char *tty = NULL;
FILE *port_file;
/*
* Initialize zephyr. If error, print error message & exit.
*/
nhp = malloc(sizeof(struct notice_handler_ptr));
if (!nhp) {
fprintf(stderr, "Out of memory setting up zephyr notice handler.\n");
exit(3);
}
FATAL_TRAP( ZInitialize(), "while initializing Zephyr" );
FATAL_TRAP( ZOpenPort(&zephyr_port), "while opening Zephyr port" );
/*
* Save away our port number in a special place so that zctl and
* other clients can send us control messages: <<<>>>
*/
temp = get_zwgc_port_number_filename();
port_file = fopen(temp, "r");
if (port_file) {
fprintf(stderr, "zwgc: windowgram file already exists. If you are\n");
fprintf(stderr, "zwgc: not already running zwgc, delete %s\n", temp);
fprintf(stderr, "zwgc: and try again.\n");
exit(1);
}
write_wgfile();
/* Set hostname and tty for locations. If we support X, use the
* display string for the default tty name. */
if (location_override)
tty = location_override;
#ifndef X_DISPLAY_MISSING
else if (x_dpy)
tty = DisplayString(x_dpy);
#endif
error_code = ZInitLocationInfo(NULL, tty);
TRAP( error_code, "while initializing location information" );
/*
* Retrieve the user's desired exposure level (from the zephyr variable
* "exposure"), convert it to the proper internal form then
* set the user's location using it. If the exposure level is
* not one of the allowed ones, print an error and treat it as
* EXPOSE_NONE.
*/
temp = ZGetVariable("exposure");
if (temp) {
if (!(exposure = ZParseExposureLevel(temp))) {
ERROR2("invalid exposure level %s, using exposure level none instead.\n", temp);
exposure = EXPOSE_NONE;
}
} else
exposure = EXPOSE_OPSTAFF;
error_code = ZSetLocation(exposure); /* <<<>>> */
if (error_code != ZERR_LOGINFAIL)
TRAP( error_code, "while setting location" );
/*
* If the exposure level isn't EXPOSE_NONE, turn on recieving notices.
* (this involves reading in the subscription file, etc.)
*/
if (string_Neq(exposure, EXPOSE_NONE))
zwgc_startup();
/*
* Set $realm to our realm and $user to our zephyr username:
*/
var_set_variable("realm", (char *)ZGetRealm()); /* XXX should propagate the
* const */
var_set_variable("user", ZGetSender());
/*
* <<<>>>
*/
nhp->notice_handler = notice_handler;
mux_add_input_source(ZGetFD(), (void (*)(void *))handle_zephyr_input, nhp);
zephyr_inited = 1;
return;
}
/*
*
*/
void finalize_zephyr(void) /* <<<>>> */
{
string temp;
if (zephyr_inited) {
/*
* Remove the file containing our port # since it is no longer needed:
*/
errno = 0;
temp = get_zwgc_port_number_filename();
unlink(temp);
if (errno) {
fprintf(stderr, "zwgc: error while trying to delete %s: ", temp);
perror("");
}
/*
* Cancel our subscriptions, unset our location, and close our zephyr
* connection:
*/
#ifdef DEBUG
if (zwgc_debug) {
TRAP( ZUnsetLocation(), "while unsetting location" );
TRAP( ZCancelSubscriptions(0), "while canceling subscriptions" );
} else {
#endif /* DEBUG */
(void) ZUnsetLocation();
(void) ZCancelSubscriptions(0);
#ifdef DEBUG
}
#endif /* DEBUG */
ZClosePort();
}
return;
}
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