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1.1 root 1: /*
2: * Copyright (c) 1983 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: */
6:
7: #ifndef lint
8: static char sccsid[] = "@(#)invite.c 5.2 (Berkeley) 3/13/86";
9: #endif not lint
10:
11: #include "talk_ctl.h"
12: #include <sys/time.h>
13: #include <signal.h>
14: #include <setjmp.h>
15:
16: /*
17: * There wasn't an invitation waiting, so send a request containing
18: * our sockt address to the remote talk daemon so it can invite
19: * him
20: */
21:
22: /*
23: * The msg.id's for the invitations
24: * on the local and remote machines.
25: * These are used to delete the
26: * invitations.
27: */
28: int local_id, remote_id;
29: void re_invite();
30: jmp_buf invitebuf;
31:
32: invite_remote()
33: {
34: int nfd, read_mask, template, new_sockt;
35: struct itimerval itimer;
36: CTL_RESPONSE response;
37:
38: itimer.it_value.tv_sec = RING_WAIT;
39: itimer.it_value.tv_usec = 0;
40: itimer.it_interval = itimer.it_value;
41: if (listen(sockt, 5) != 0)
42: p_error("Error on attempt to listen for caller");
43: msg.addr = *(struct sockaddr *)&my_addr;
44: msg.addr.sa_family = htons(msg.addr.sa_family);
45: msg.id_num = htonl(-1); /* an impossible id_num */
46: invitation_waiting = 1;
47: announce_invite();
48: /*
49: * Shut off the automatic messages for a while,
50: * so we can use the interupt timer to resend the invitation
51: */
52: end_msgs();
53: setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
54: message("Waiting for your party to respond");
55: signal(SIGALRM, re_invite);
56: (void) setjmp(invitebuf);
57: while ((new_sockt = accept(sockt, 0, 0)) < 0) {
58: if (errno == EINTR)
59: continue;
60: p_error("Unable to connect with your party");
61: }
62: close(sockt);
63: sockt = new_sockt;
64:
65: /*
66: * Have the daemons delete the invitations now that we
67: * have connected.
68: */
69: current_state = "Waiting for your party to respond";
70: start_msgs();
71:
72: msg.id_num = htonl(local_id);
73: ctl_transact(my_machine_addr, msg, DELETE, &response);
74: msg.id_num = htonl(remote_id);
75: ctl_transact(his_machine_addr, msg, DELETE, &response);
76: invitation_waiting = 0;
77: }
78:
79: /*
80: * Routine called on interupt to re-invite the callee
81: */
82: void
83: re_invite()
84: {
85:
86: message("Ringing your party again");
87: current_line++;
88: /* force a re-announce */
89: msg.id_num = htonl(remote_id + 1);
90: announce_invite();
91: longjmp(invitebuf, 1);
92: }
93:
94: static char *answers[] = {
95: "Your party is not logged on", /* NOT_HERE */
96: "Target machine does not recognize us", /* MACHINE_UNKNOWN */
97: "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */
98: "Target machine is too confused to talk to us", /* FAILED */
99: "Your party is refusing messages", /* PERMISSION_REFUSED */
100: "Target machine indicates protocol mismatch", /* BADVERSION */
101: "Target machine indicates protocol botch (addr)",/* BADADDR */
102: "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */
103: };
104: #define NANSWERS (sizeof (answers) / sizeof (answers[0]))
105:
106: /*
107: * Transmit the invitation and process the response
108: */
109: announce_invite()
110: {
111: CTL_RESPONSE response;
112:
113: current_state = "Trying to connect to your party's talk daemon";
114: ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
115: remote_id = response.id_num;
116: if (response.answer != SUCCESS) {
117: if (response.answer < NANSWERS)
118: message(answers[response.answer]);
119: quit();
120: }
121: /* leave the actual invitation on my talk daemon */
122: ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
123: local_id = response.id_num;
124: }
125:
126: /*
127: * Tell the daemon to remove your invitation
128: */
129: send_delete()
130: {
131:
132: msg.type = DELETE;
133: /*
134: * This is just a extra clean up, so just send it
135: * and don't wait for an answer
136: */
137: msg.id_num = htonl(remote_id);
138: daemon_addr.sin_addr = his_machine_addr;
139: if (sendto(ctl_sockt, &msg, sizeof (msg), 0, &daemon_addr,
140: sizeof (daemon_addr)) != sizeof(msg))
141: perror("send_delete (remote)");
142: msg.id_num = htonl(local_id);
143: daemon_addr.sin_addr = my_machine_addr;
144: if (sendto(ctl_sockt, &msg, sizeof (msg), 0, &daemon_addr,
145: sizeof (daemon_addr)) != sizeof (msg))
146: perror("send_delete (local)");
147: }
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