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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
*
* $Id$
*
* Copyright (c) 1987,1988,1991 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include <zephyr/mit-copyright.h>
#include "zserver.h"
#include <sys/socket.h>
#if !defined (lint) && !defined (SABER)
static const char rcsid_client_c[] =
"$Id$";
#endif
/*
* External functions:
*
* Code_t client_register(notice, who, client, server, wantdefaults)
* ZNotice_t *notice;
* struct sockaddr_in *who;
* Client **client; (RETURN)
* Server *server;
* int wantdefaults;
*
* Code_t client_deregister(client, host, flush)
* Client *client;
* Host *host;
* int flush;
*
* Client *client_find(who, unsigned int port)
* struct in_addr *host;
* unsigned int port;
*
* void client_dump_clients(fp, clist)
* FILE *fp;
* Client *clist;
*/
/*
* 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_find.
*/
#define HASHSIZE 1024
static Client *client_bucket[HASHSIZE];
#define INET_HASH(host, port) ((htonl((host)->s_addr) + \
htons((unsigned short) (port))) % HASHSIZE)
Code_t
client_register(ZNotice_t *notice,
struct in_addr *host,
Client **client_p,
int wantdefaults)
{
Client *client;
/* chain the client's host onto this server's host list */
zdbug((LOG_DEBUG, "client_register: adding %s at %s/%d",
notice->z_sender, inet_ntoa(*host), ntohs(notice->z_port)));
if (!notice->z_port)
return ZSRV_BADSUBPORT;
*client_p = client = client_find(host, notice->z_port);
if (!client) {
*client_p = client = (Client *) malloc(sizeof(Client));
if (!client)
return ENOMEM;
memset(&client->addr, 0, sizeof(struct sockaddr_in));
#ifdef HAVE_KRB5
client->session_keyblock = NULL;
#else
#ifdef HAVE_KRB4
memset(&client->session_key, 0, sizeof(client->session_key));
#endif
#endif
client->last_send = 0;
client->last_ack = NOW;
client->addr.sin_family = AF_INET;
client->addr.sin_addr.s_addr = host->s_addr;
client->addr.sin_port = notice->z_port;
client->subs = NULL;
client->realm = NULL;
client->principal = make_string(notice->z_sender, 0);
Client_insert(&client_bucket[INET_HASH(&client->addr.sin_addr,
notice->z_port)], client);
}
/* Add default subscriptions only if this is not resulting from a brain
* dump, AND this request wants defaults. */
if (!bdumping && wantdefaults)
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 *client,
int flush)
{
Client_delete(client);
nack_release(client);
subscr_cancel_client(client);
free_string(client->principal);
#ifdef HAVE_KRB5
if (client->session_keyblock)
krb5_free_keyblock(Z_krb5_ctx, client->session_keyblock);
#endif
if (flush)
uloc_flush_client(&client->addr);
free(client);
}
void
client_flush_host(struct in_addr *host)
{
int i;
Client *client, *next;
for (i = 0; i < HASHSIZE; i++) {
for (client = client_bucket[i]; client; client = next) {
next = client->next;
if (client->addr.sin_addr.s_addr == host->s_addr)
client_deregister(client, 1);
}
}
uloc_hflush(host);
}
/* Unlike client_flush_host, this flushes only subs, not locations */
void
client_flush_princ(char *target)
{
int i;
Client *client, *next;
String *principal = make_string(target, 0);
for (i = 0; i < HASHSIZE; i++) {
for (client = client_bucket[i]; client; client = next) {
next = client->next;
if (client->principal == principal)
client_deregister(client, 0);
}
}
free_string(principal);
}
Code_t
client_send_clients(void)
{
int i;
Client *client;
Code_t retval;
for (i = 0; i < HASHSIZE; i++) {
/* Allow packets to be processed between rows of the hash table. */
if (packets_waiting()) {
bdumping = 0;
bdump_concurrent = 1;
handle_packet();
bdump_concurrent = 0;
bdumping = 1;
}
for (client = client_bucket[i]; client; client = client->next) {
if (client->subs) {
retval = subscr_send_subs(client);
if (retval != ZERR_NONE)
return retval;
}
}
}
return ZERR_NONE;
}
/*
* 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(FILE *fp)
{
Client *client;
int i;
for (i = 0; i < HASHSIZE; i++) {
for (client = client_bucket[i]; client; client = client->next) {
fprintf(fp, "%s/%d (%s):\n", inet_ntoa(client->addr.sin_addr),
ntohs(client->addr.sin_port), client->principal->string);
subscr_dump_subs(fp, client->subs);
}
}
}
/*
* find a client by host and port
*/
Client *
client_find(struct in_addr *host,
unsigned int port)
{
Client *client;
long hashval;
hashval = INET_HASH(host, port);
for (client = client_bucket[hashval]; client; client = client->next) {
if (client->addr.sin_addr.s_addr == host->s_addr
&& client->addr.sin_port == port)
return client;
}
return NULL;
}
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