1 /*- 2 * Copyright (c) 1983, 1985 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)invite.c 5.1 (Berkeley) 6/6/85"; 10 #endif not lint 11 12 #include "talk_ctl.h" 13 #include <sys/time.h> 14 #include <signal.h> 15 #include <setjmp.h> 16 17 /* 18 * There wasn't an invitation waiting, so send a request containing 19 * our sockt address to the remote talk daemon so it can invite 20 * him 21 */ 22 23 /* 24 * The msg.id's for the invitations 25 * on the local and remote machines. 26 * These are used to delete the 27 * invitations. 28 */ 29 int local_id, remote_id; 30 void re_invite(); 31 jmp_buf invitebuf; 32 33 invite_remote() 34 { 35 int nfd, read_mask, template, new_sockt; 36 struct itimerval itimer; 37 CTL_RESPONSE response; 38 39 itimer.it_value.tv_sec = RING_WAIT; 40 itimer.it_value.tv_usec = 0; 41 itimer.it_interval = itimer.it_value; 42 if (listen(sockt, 5) != 0) 43 p_error("Error on attempt to listen for caller"); 44 msg.addr = my_addr; 45 msg.id_num = -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 = local_id; 73 ctl_transact(my_machine_addr, msg, DELETE, &response); 74 msg.id_num = 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 = remote_id + 1; 90 announce_invite(); 91 longjmp(invitebuf, 1); 92 } 93 94 /* 95 * Transmit the invitation and process the response 96 */ 97 announce_invite() 98 { 99 CTL_RESPONSE response; 100 101 current_state = "Trying to connect to your party's talk daemon"; 102 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 103 remote_id = response.id_num; 104 if (response.answer != SUCCESS) { 105 switch (response.answer) { 106 107 case NOT_HERE : 108 message("Your party is not logged on"); 109 break; 110 111 case MACHINE_UNKNOWN : 112 message("Target machine does not recognize us"); 113 break; 114 115 case UNKNOWN_REQUEST : 116 message("Target machine can not handle remote talk"); 117 break; 118 119 case FAILED : 120 message("Target machine is too confused to talk to us"); 121 break; 122 123 case PERMISSION_DENIED : 124 message("Your party is refusing messages"); 125 break; 126 } 127 quit(); 128 } 129 /* leave the actual invitation on my talk daemon */ 130 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 131 local_id = response.id_num; 132 } 133 134 /* 135 * Tell the daemon to remove your invitation 136 */ 137 send_delete() 138 { 139 140 msg.type = DELETE; 141 /* 142 * This is just a extra clean up, so just send it 143 * and don't wait for an answer 144 */ 145 msg.id_num = remote_id; 146 daemon_addr.sin_addr = his_machine_addr; 147 if (sendto(ctl_sockt, &msg, sizeof(CTL_MSG), 0, 148 (struct sockaddr *)&daemon_addr, 149 sizeof(daemon_addr)) != sizeof(CTL_MSG)) 150 perror("send_delete remote"); 151 msg.id_num = local_id; 152 daemon_addr.sin_addr = my_machine_addr; 153 if (sendto(ctl_sockt, &msg, sizeof(CTL_MSG), 0, 154 (struct sockaddr *)&daemon_addr, 155 sizeof(daemon_addr)) != sizeof(CTL_MSG)) 156 perror("send_delete local"); 157 } 158