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(notice, host, client_p, wantdefaults)
71 /* chain the client's host onto this server's host list */
74 zdbug((LOG_DEBUG, "client_register: adding %s at %s/%d",
75 notice->z_sender, inet_ntoa(*host), ntohs(notice->z_port)));
79 return ZSRV_BADSUBPORT;
81 *client_p = client = client_find(host, notice->z_port);
83 *client_p = client = (Client *) malloc(sizeof(Client));
86 memset(&client->addr, 0, sizeof(struct sockaddr_in));
88 memset(&client->session_key, 0, sizeof(client->session_key));
90 client->last_send = 0;
91 client->last_ack = NOW;
92 client->addr.sin_family = AF_INET;
93 client->addr.sin_addr.s_addr = host->s_addr;
94 client->addr.sin_port = notice->z_port;
97 client->principal = make_string(notice->z_sender, 0);
98 LIST_INSERT(&client_bucket[INET_HASH(&client->addr.sin_addr,
99 notice->z_port)], client);
102 /* Add default subscriptions only if this is not resulting from a brain
103 * dump, AND this request wants defaults. */
104 if (!bdumping && wantdefaults)
105 return subscr_def_subs(client);
111 * Deregister the client, freeing resources.
112 * Remove any packets in the nack queue, release subscriptions, release
113 * locations, and dequeue him from the host.
117 client_deregister(client, flush)
122 nack_release(client);
123 subscr_cancel_client(client);
124 free_string(client->principal);
126 uloc_flush_client(&client->addr);
131 client_flush_host(host)
132 struct in_addr *host;
135 Client *client, *next;
137 for (i = 0; i < HASHSIZE; i++) {
138 for (client = client_bucket[i]; client; client = next) {
140 if (client->addr.sin_addr.s_addr == host->s_addr)
141 client_deregister(client, 1);
148 client_send_clients()
154 for (i = 0; i < HASHSIZE; i++) {
155 /* Allow packets to be processed between rows of the hash table. */
156 if (packets_waiting()) {
158 bdump_concurrent = 1;
160 bdump_concurrent = 0;
163 for (client = client_bucket[i]; client; client = client->next) {
165 retval = subscr_send_subs(client);
166 if (retval != ZERR_NONE)
175 * dump info about clients in this clist onto the fp.
176 * assumed to be called with SIGFPE blocked
177 * (true if called from signal handler)
181 client_dump_clients(fp)
187 for (i = 0; i < HASHSIZE; i++) {
188 for (client = client_bucket[i]; client; client = client->next) {
189 fprintf(fp, "%s/%d (%s):\n", inet_ntoa(client->addr.sin_addr),
190 ntohs(client->addr.sin_port), client->principal->string);
191 subscr_dump_subs(fp, client->subs);
197 * find a client by host and port
201 client_find(host, port)
202 struct in_addr *host;
208 hashval = INET_HASH(host, port);
209 for (client = client_bucket[hashval]; client; client = client->next) {
210 if (client->addr.sin_addr.s_addr == host->s_addr
211 && client->addr.sin_port == port)