1 /* This file is part of the Project Athena Zephyr Notification System.
2 * It contains functions for the Client Manager subsystem of the Zephyr server.
4 * Created by: John T. Kohl
8 * Copyright (c) 1987,1988,1991 by the Massachusetts Institute of Technology.
9 * For copying and distribution information, see the file
13 #include <zephyr/mit-copyright.h>
15 #include <sys/socket.h>
17 #if !defined (lint) && !defined (SABER)
18 static const char rcsid_client_c[] =
25 * Code_t client_register(notice, who, client, server, wantdefaults)
27 * struct sockaddr_in *who;
28 * Client **client; (RETURN)
32 * Code_t client_deregister(client, host, flush)
37 * Client *client_find(who, unsigned int port)
38 * struct in_addr *host;
41 * void client_dump_clients(fp, clist)
47 * a client: allocate space, find or insert the address in the
48 * server's list of hosts, initialize and insert the client into
49 * the host's list of clients.
51 * This routine assumes that the client has not been registered yet.
52 * The caller should check by calling client_find.
56 static Client *client_bucket[HASHSIZE];
58 #define INET_HASH(host, port) ((htonl((host)->s_addr) + \
59 htons((unsigned short) (port))) % HASHSIZE)
62 client_register(ZNotice_t *notice,
70 /* chain the client's host onto this server's host list */
73 zdbug((LOG_DEBUG, "client_register: adding %s at %s/%d",
74 notice->z_sender, inet_ntoa(*host), ntohs(notice->z_port)));
78 return ZSRV_BADSUBPORT;
80 *client_p = client = client_find(host, notice->z_port);
82 *client_p = client = (Client *) malloc(sizeof(Client));
85 memset(&client->addr, 0, sizeof(struct sockaddr_in));
87 client->session_keyblock = NULL;
90 memset(&client->session_key, 0, sizeof(client->session_key));
93 client->last_send = 0;
94 client->last_ack = NOW;
95 client->addr.sin_family = AF_INET;
96 client->addr.sin_addr.s_addr = host->s_addr;
97 client->addr.sin_port = notice->z_port;
100 client->principal = make_string(notice->z_sender, 0);
101 LIST_INSERT(&client_bucket[INET_HASH(&client->addr.sin_addr,
102 notice->z_port)], client);
105 /* Add default subscriptions only if this is not resulting from a brain
106 * dump, AND this request wants defaults. */
107 if (!bdumping && wantdefaults)
108 return subscr_def_subs(client);
114 * Deregister the client, freeing resources.
115 * Remove any packets in the nack queue, release subscriptions, release
116 * locations, and dequeue him from the host.
120 client_deregister(Client *client,
124 nack_release(client);
125 subscr_cancel_client(client);
126 free_string(client->principal);
128 if (client->session_keyblock)
129 krb5_free_keyblock(Z_krb5_ctx, client->session_keyblock);
132 uloc_flush_client(&client->addr);
137 client_flush_host(struct in_addr *host)
140 Client *client, *next;
142 for (i = 0; i < HASHSIZE; i++) {
143 for (client = client_bucket[i]; client; client = next) {
145 if (client->addr.sin_addr.s_addr == host->s_addr)
146 client_deregister(client, 1);
153 client_send_clients(void)
159 for (i = 0; i < HASHSIZE; i++) {
160 /* Allow packets to be processed between rows of the hash table. */
161 if (packets_waiting()) {
163 bdump_concurrent = 1;
165 bdump_concurrent = 0;
168 for (client = client_bucket[i]; client; client = client->next) {
170 retval = subscr_send_subs(client);
171 if (retval != ZERR_NONE)
180 * dump info about clients in this clist onto the fp.
181 * assumed to be called with SIGFPE blocked
182 * (true if called from signal handler)
186 client_dump_clients(FILE *fp)
191 for (i = 0; i < HASHSIZE; i++) {
192 for (client = client_bucket[i]; client; client = client->next) {
193 fprintf(fp, "%s/%d (%s):\n", inet_ntoa(client->addr.sin_addr),
194 ntohs(client->addr.sin_port), client->principal->string);
195 subscr_dump_subs(fp, client->subs);
201 * find a client by host and port
205 client_find(struct in_addr *host,
211 hashval = INET_HASH(host, port);
212 for (client = client_bucket[hashval]; client; client = client->next) {
213 if (client->addr.sin_addr.s_addr == host->s_addr
214 && client->addr.sin_port == port)