1 /* 2 * Copyright (c) 1983 Regents of the University of California. 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. 11 */ 12 13 #ifndef lint 14 static char sccsid[] = "@(#)invite.c 5.4 (Berkeley) 05/20/88"; 15 #endif /* not lint */ 16 17 #include "talk_ctl.h" 18 #include <sys/time.h> 19 #include <signal.h> 20 #include <setjmp.h> 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; 37 38 invite_remote() 39 { 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"); 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 */ 52 invitation_waiting = 1; 53 announce_invite(); 54 /* 55 * Shut off the automatic messages for a while, 56 * so we can use the interupt timer to resend the invitation 57 */ 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"); 67 } 68 close(sockt); 69 sockt = new_sockt; 70 71 /* 72 * Have the daemons delete the invitations now that we 73 * have connected. 74 */ 75 current_state = "Waiting for your party to respond"; 76 start_msgs(); 77 78 msg.id_num = htonl(local_id); 79 ctl_transact(my_machine_addr, msg, DELETE, &response); 80 msg.id_num = htonl(remote_id); 81 ctl_transact(his_machine_addr, msg, DELETE, &response); 82 invitation_waiting = 0; 83 } 84 85 /* 86 * Routine called on interupt to re-invite the callee 87 */ 88 void 89 re_invite() 90 { 91 92 message("Ringing your party again"); 93 current_line++; 94 /* force a re-announce */ 95 msg.id_num = htonl(remote_id + 1); 96 announce_invite(); 97 longjmp(invitebuf, 1); 98 } 99 100 static char *answers[] = { 101 "answer #0", /* SUCCESS */ 102 "Your party is not logged on", /* NOT_HERE */ 103 "Target machine is too confused to talk to us", /* FAILED */ 104 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 105 "Your party is refusing messages", /* PERMISSION_REFUSED */ 106 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 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])) 112 113 /* 114 * Transmit the invitation and process the response 115 */ 116 announce_invite() 117 { 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) { 124 if (response.answer < NANSWERS) 125 message(answers[response.answer]); 126 quit(); 127 } 128 /* leave the actual invitation on my talk daemon */ 129 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 130 local_id = response.id_num; 131 } 132 133 /* 134 * Tell the daemon to remove your invitation 135 */ 136 send_delete() 137 { 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 */ 144 msg.id_num = htonl(remote_id); 145 daemon_addr.sin_addr = his_machine_addr; 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); 150 daemon_addr.sin_addr = my_machine_addr; 151 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, &daemon_addr, 152 sizeof (daemon_addr)) != sizeof (msg)) 153 perror("send_delete (local)"); 154 } 155