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d0aeaf5a DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
f9ac90b4 KB |
3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that this notice is preserved and that due credit is given | |
7 | * to the University of California at Berkeley. The name of the University | |
8 | * may not be used to endorse or promote products derived from this | |
9 | * software without specific prior written permission. This software | |
10 | * is provided ``as is'' without express or implied warranty. | |
d0aeaf5a DF |
11 | */ |
12 | ||
963ce42e | 13 | #ifndef lint |
f9ac90b4 KB |
14 | static char sccsid[] = "@(#)invite.c 5.4 (Berkeley) %G%"; |
15 | #endif /* not lint */ | |
ec7915a9 MK |
16 | |
17 | #include "talk_ctl.h" | |
18 | #include <sys/time.h> | |
19 | #include <signal.h> | |
20 | #include <setjmp.h> | |
963ce42e MK |
21 | |
22 | /* | |
23 | * There wasn't an invitation waiting, so send a request containing | |
24 | * our sockt address to the remote talk daemon so it can invite | |
25 | * him | |
26 | */ | |
27 | ||
28 | /* | |
29 | * The msg.id's for the invitations | |
30 | * on the local and remote machines. | |
31 | * These are used to delete the | |
32 | * invitations. | |
33 | */ | |
34 | int local_id, remote_id; | |
35 | void re_invite(); | |
36 | jmp_buf invitebuf; | |
ec7915a9 MK |
37 | |
38 | invite_remote() | |
39 | { | |
963ce42e MK |
40 | int nfd, read_mask, template, new_sockt; |
41 | struct itimerval itimer; | |
42 | CTL_RESPONSE response; | |
43 | ||
44 | itimer.it_value.tv_sec = RING_WAIT; | |
45 | itimer.it_value.tv_usec = 0; | |
46 | itimer.it_interval = itimer.it_value; | |
47 | if (listen(sockt, 5) != 0) | |
48 | p_error("Error on attempt to listen for caller"); | |
4fa2ac2d KM |
49 | msg.addr = *(struct sockaddr *)&my_addr; |
50 | msg.addr.sa_family = htons(msg.addr.sa_family); | |
51 | msg.id_num = htonl(-1); /* an impossible id_num */ | |
963ce42e MK |
52 | invitation_waiting = 1; |
53 | announce_invite(); | |
ec7915a9 | 54 | /* |
963ce42e | 55 | * Shut off the automatic messages for a while, |
ec7915a9 MK |
56 | * so we can use the interupt timer to resend the invitation |
57 | */ | |
963ce42e MK |
58 | end_msgs(); |
59 | setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); | |
60 | message("Waiting for your party to respond"); | |
61 | signal(SIGALRM, re_invite); | |
62 | (void) setjmp(invitebuf); | |
63 | while ((new_sockt = accept(sockt, 0, 0)) < 0) { | |
64 | if (errno == EINTR) | |
65 | continue; | |
66 | p_error("Unable to connect with your party"); | |
ec7915a9 | 67 | } |
963ce42e MK |
68 | close(sockt); |
69 | sockt = new_sockt; | |
ec7915a9 | 70 | |
963ce42e MK |
71 | /* |
72 | * Have the daemons delete the invitations now that we | |
73 | * have connected. | |
ec7915a9 | 74 | */ |
963ce42e MK |
75 | current_state = "Waiting for your party to respond"; |
76 | start_msgs(); | |
77 | ||
4fa2ac2d | 78 | msg.id_num = htonl(local_id); |
963ce42e | 79 | ctl_transact(my_machine_addr, msg, DELETE, &response); |
4fa2ac2d | 80 | msg.id_num = htonl(remote_id); |
963ce42e MK |
81 | ctl_transact(his_machine_addr, msg, DELETE, &response); |
82 | invitation_waiting = 0; | |
ec7915a9 MK |
83 | } |
84 | ||
963ce42e MK |
85 | /* |
86 | * Routine called on interupt to re-invite the callee | |
87 | */ | |
88 | void | |
89 | re_invite() | |
ec7915a9 | 90 | { |
963ce42e MK |
91 | |
92 | message("Ringing your party again"); | |
93 | current_line++; | |
ec7915a9 | 94 | /* force a re-announce */ |
4fa2ac2d | 95 | msg.id_num = htonl(remote_id + 1); |
963ce42e MK |
96 | announce_invite(); |
97 | longjmp(invitebuf, 1); | |
ec7915a9 MK |
98 | } |
99 | ||
4fa2ac2d | 100 | static char *answers[] = { |
665b6bbc | 101 | "answer #0", /* SUCCESS */ |
4fa2ac2d | 102 | "Your party is not logged on", /* NOT_HERE */ |
4fa2ac2d | 103 | "Target machine is too confused to talk to us", /* FAILED */ |
665b6bbc | 104 | "Target machine does not recognize us", /* MACHINE_UNKNOWN */ |
4fa2ac2d | 105 | "Your party is refusing messages", /* PERMISSION_REFUSED */ |
665b6bbc | 106 | "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ |
4fa2ac2d KM |
107 | "Target machine indicates protocol mismatch", /* BADVERSION */ |
108 | "Target machine indicates protocol botch (addr)",/* BADADDR */ | |
109 | "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ | |
110 | }; | |
111 | #define NANSWERS (sizeof (answers) / sizeof (answers[0])) | |
112 | ||
963ce42e MK |
113 | /* |
114 | * Transmit the invitation and process the response | |
115 | */ | |
ec7915a9 MK |
116 | announce_invite() |
117 | { | |
963ce42e MK |
118 | CTL_RESPONSE response; |
119 | ||
120 | current_state = "Trying to connect to your party's talk daemon"; | |
121 | ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); | |
122 | remote_id = response.id_num; | |
123 | if (response.answer != SUCCESS) { | |
4fa2ac2d KM |
124 | if (response.answer < NANSWERS) |
125 | message(answers[response.answer]); | |
963ce42e | 126 | quit(); |
ec7915a9 | 127 | } |
ec7915a9 | 128 | /* leave the actual invitation on my talk daemon */ |
963ce42e MK |
129 | ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); |
130 | local_id = response.id_num; | |
ec7915a9 | 131 | } |
4fa2ac2d | 132 | |
963ce42e MK |
133 | /* |
134 | * Tell the daemon to remove your invitation | |
135 | */ | |
ec7915a9 MK |
136 | send_delete() |
137 | { | |
963ce42e MK |
138 | |
139 | msg.type = DELETE; | |
140 | /* | |
141 | * This is just a extra clean up, so just send it | |
142 | * and don't wait for an answer | |
143 | */ | |
4fa2ac2d | 144 | msg.id_num = htonl(remote_id); |
963ce42e | 145 | daemon_addr.sin_addr = his_machine_addr; |
4fa2ac2d KM |
146 | if (sendto(ctl_sockt, &msg, sizeof (msg), 0, &daemon_addr, |
147 | sizeof (daemon_addr)) != sizeof(msg)) | |
148 | perror("send_delete (remote)"); | |
149 | msg.id_num = htonl(local_id); | |
963ce42e | 150 | daemon_addr.sin_addr = my_machine_addr; |
4fa2ac2d KM |
151 | if (sendto(ctl_sockt, &msg, sizeof (msg), 0, &daemon_addr, |
152 | sizeof (daemon_addr)) != sizeof (msg)) | |
153 | perror("send_delete (local)"); | |
ec7915a9 | 154 | } |