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+/*
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+ * Copyright (c) 1983, 1993
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+ * The Regents of the University of California. All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ * 4. Neither the name of the University nor the names of its contributors
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+ * may be used to endorse or promote products derived from this software
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+ * without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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+ * SUCH DAMAGE.
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+ *
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+ * @(#)talkd.h 8.1 (Berkeley) 6/2/93
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+ */
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+
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+#ifndef _PROTOCOLS_TALKD_H
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+#define _PROTOCOLS_TALKD_H 1
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+
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+/*
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+ * This describes the protocol used by the talk server and clients.
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+ *
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+ * The talk server acts a repository of invitations, responding to
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+ * requests by clients wishing to rendezvous for the purpose of
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+ * holding a conversation. In normal operation, a client, the caller,
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+ * initiates a rendezvous by sending a CTL_MSG to the server of
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+ * type LOOK_UP. This causes the server to search its invitation
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+ * tables to check if an invitation currently exists for the caller
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+ * (to speak to the callee specified in the message). If the lookup
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+ * fails, the caller then sends an ANNOUNCE message causing the server
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+ * to broadcast an announcement on the callee's login ports requesting
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+ * contact. When the callee responds, the local server uses the
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+ * recorded invitation to respond with the appropriate rendezvous
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+ * address and the caller and callee client programs establish a
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+ * stream connection through which the conversation takes place.
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+ */
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+
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+#include <sys/types.h>
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+#include <sys/socket.h>
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+
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+/*
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+ * Client->server request message format.
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+ */
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+typedef struct {
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+ u_char vers; /* protocol version */
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+ u_char type; /* request type, see below */
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+ u_char answer; /* not used */
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+ u_char pad;
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+ u_int32_t id_num; /* message id */
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+ struct osockaddr addr; /* old (4.3) style */
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+ struct osockaddr ctl_addr; /* old (4.3) style */
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+ int32_t pid; /* caller's process id */
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+#define NAME_SIZE 12
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+ char l_name[NAME_SIZE];/* caller's name */
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+ char r_name[NAME_SIZE];/* callee's name */
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+#define TTY_SIZE 16
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+ char r_tty[TTY_SIZE];/* callee's tty name */
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+} CTL_MSG;
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+
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+/*
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+ * Server->client response message format.
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+ */
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+typedef struct {
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+ u_char vers; /* protocol version */
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+ u_char type; /* type of request message, see below */
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+ u_char answer; /* response to request message, see below */
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+ u_char pad;
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+ u_int32_t id_num; /* message id */
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+ struct osockaddr addr; /* address for establishing conversation */
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+} CTL_RESPONSE;
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+
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+#define TALK_VERSION 1 /* protocol version */
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+
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+/* message type values */
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+#define LEAVE_INVITE 0 /* leave invitation with server */
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+#define LOOK_UP 1 /* check for invitation by callee */
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+#define DELETE 2 /* delete invitation by caller */
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+#define ANNOUNCE 3 /* announce invitation by caller */
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+
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+/* answer values */
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+#define SUCCESS 0 /* operation completed properly */
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+#define NOT_HERE 1 /* callee not logged in */
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+#define FAILED 2 /* operation failed for unexplained reason */
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+#define MACHINE_UNKNOWN 3 /* caller's machine name unknown */
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+#define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */
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+#define UNKNOWN_REQUEST 5 /* request has invalid type value */
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+#define BADVERSION 6 /* request has invalid protocol version */
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+#define BADADDR 7 /* request has invalid addr value */
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+#define BADCTLADDR 8 /* request has invalid ctl_addr value */
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+
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+/*
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+ * Operational parameters.
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+ */
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+#define MAX_LIFE 60 /* max time daemon saves invitations */
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+/* RING_WAIT should be 10's of seconds less than MAX_LIFE */
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+#define RING_WAIT 30 /* time to wait before resending invitation */
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+
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+#endif /* protocols/talkd.h */
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