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/* This file is part of the Project Athena Zephyr Notification System.
* It contains functions for the Client Manager subsystem of the Zephyr server.
*
* Created by: John T. Kohl
*
* $Source$
* $Author$
*
* Copyright (c) 1987,1988 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include <zephyr/mit-copyright.h>
#ifndef lint
#ifndef SABER
static char rcsid_client_c[] = "$Header$";
#endif SABER
#endif lint
/*
* External functions:
*
* Code_t client_register(notice, who, client, server, wantdefaults)
* ZNotice_t *notice;
* struct sockaddr_in *who;
* ZClient_t **client; (RETURN)
* ZServerDesc_t *server;
* int wantdefaults;
*
* Code_t client_deregister(client, host, flush)
* ZClient_t *client;
* ZHostList_t *host;
* int flush;
*
* ZClient_t *client_which_client(who, notice)
* struct sockaddr_in *who;
* ZNotice_t *notice;
*
* void client_dump_clients(fp, clist)
* FILE *fp;
* ZClientList_t *clist;
*/
#include "zserver.h"
#include <sys/socket.h>
static void clt_free();
/*
* register a client: allocate space, find or insert the address in the
* server's list of hosts, initialize and insert the client into
* the host's list of clients.
*
* This routine assumes that the client has not been registered yet.
* The caller should check by calling client_which_client
*/
Code_t
client_register(notice, who, client, server, wantdefaults)
ZNotice_t *notice;
struct sockaddr_in *who;
register ZClient_t **client; /* RETURN */
ZServerDesc_t *server;
int wantdefaults;
{
register ZHostList_t *hlp = server->zs_hosts;
register ZHostList_t *hlp2;
register ZClientList_t *clist;
int omask;
/* chain the client's host onto this server's host list */
if (!hlp) { /* bad host list */
syslog(LOG_ERR, "cl_register: bad server host list");
abort();
}
if (!(hlp2 = hostm_find_host(&who->sin_addr))) {
/* not here */
return(ZSRV_HNOTFOUND);
}
/* hlp2 is now pointing to the client's host's address struct */
if (!hlp2->zh_clients) {
return(EINVAL);
}
/* allocate a client struct */
if (!(*client = (ZClient_t *) xmalloc(sizeof(ZClient_t))))
return(ENOMEM);
if (!(clist = (ZClientList_t *) xmalloc(sizeof(ZClientList_t)))) {
xfree(*client);
return(ENOMEM);
}
clist->q_forw = clist->q_back = clist;
clist->zclt_client = *client;
/* initialize the struct */
bzero((caddr_t) &(*client)->zct_sin, sizeof(struct sockaddr_in));
(*client)->zct_sin.sin_addr.s_addr = who->sin_addr.s_addr;
(*client)->zct_sin.sin_port = notice->z_port;
(*client)->zct_sin.sin_family = AF_INET;
(*client)->zct_subs = NULLZST;
(*client)->zct_subs = NULLZST;
(*client)->zct_principal = strsave(notice->z_sender);
/* chain him in to the clients list in the host list*/
omask = sigblock(sigmask(SIGFPE)); /* don't let db dumps start */
xinsque(clist, hlp2->zh_clients);
(void) sigsetmask(omask);
if (!server->zs_dumping && wantdefaults)
/* add default subscriptions only if this is not
resulting from a brain dump, AND this request
wants defaults */
return(subscr_def_subs(*client));
else
return(ZERR_NONE);
}
/*
* Deregister the client, freeing resources.
* Remove any packets in the nack queue, release subscriptions, release
* locations, and dequeue him from the host.
*/
void
client_deregister(client, host, flush)
ZClient_t *client;
ZHostList_t *host;
int flush;
{
ZClientList_t *clients;
int omask = sigblock(sigmask(SIGFPE)); /* don't let db dumps start */
/* release any not-acked packets in the rexmit queue */
nack_release(client);
/* release subscriptions */
(void) subscr_cancel_client(client);
if (flush)
/* release locations if this is a punted client */
(void) uloc_flush_client(&client->zct_sin);
/* unthread and release this client */
if (host->zh_clients)
for (clients = host->zh_clients->q_forw;
clients != host->zh_clients;
clients = clients->q_forw)
if (clients->zclt_client == client) {
xremque(clients);
clt_free(client);
xfree(clients);
(void) sigsetmask(omask);
return;
}
syslog(LOG_CRIT, "clt_dereg: clt not in host list");
abort();
/*NOTREACHED*/
}
/*
* find the client which sent the notice
*/
ZClient_t *
client_which_client(who, notice)
struct sockaddr_in *who;
ZNotice_t *notice;
{
register ZHostList_t *hlt;
register ZClientList_t *clients;
if (!(hlt = hostm_find_host(&who->sin_addr))) {
zdbug((LOG_DEBUG,"cl_wh_clt: host not found"));
return(NULLZCNT);
}
if (!hlt->zh_clients) {
zdbug((LOG_DEBUG,"cl_wh_clt: no clients"));
return(NULLZCNT);
}
for (clients = hlt->zh_clients->q_forw;
clients != hlt->zh_clients;
clients = clients->q_forw)
if (clients->zclt_client->zct_sin.sin_port == notice->z_port) {
return(clients->zclt_client);
}
zdbug((LOG_DEBUG, "cl_wh_clt: no port"));
return(NULLZCNT);
}
/*
* Free storage in use by client
*/
static void
clt_free(client)
ZClient_t *client;
{
xfree(client->zct_principal);
xfree(client);
}
/*
* dump info about clients in this clist onto the fp.
* assumed to be called with SIGFPE blocked
* (true if called from signal handler)
*/
void
client_dump_clients(fp, clist)
FILE *fp;
ZClientList_t *clist;
{
register ZClientList_t *ptr;
for (ptr = clist->q_forw; ptr != clist; ptr = ptr->q_forw) {
(void) fprintf(fp, "\t%d (%s):\n",
ntohs(ptr->zclt_client->zct_sin.sin_port),
ptr->zclt_client->zct_principal);
subscr_dump_subs(fp, ptr->zclt_client->zct_subs);
}
return;
}
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