1 /* 2 * Copyright (c) 1983, 1993 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 8.1 (Berkeley) 06/06/93"; 10 #endif /* not lint */ 11 12 #include <sys/types.h> 13 #include <sys/socket.h> 14 #include <sys/time.h> 15 #include <signal.h> 16 #include <netinet/in.h> 17 #include <protocols/talkd.h> 18 #include <errno.h> 19 #include <setjmp.h> 20 #include "talk_ctl.h" 21 #include "talk.h" 22 23 /* 24 * There wasn't an invitation waiting, so send a request containing 25 * our sockt address to the remote talk daemon so it can invite 26 * him 27 */ 28 29 /* 30 * The msg.id's for the invitations 31 * on the local and remote machines. 32 * These are used to delete the 33 * invitations. 34 */ 35 int local_id, remote_id; 36 void re_invite(); 37 jmp_buf invitebuf; 38 39 invite_remote() 40 { 41 int nfd, read_mask, template, new_sockt; 42 struct itimerval itimer; 43 CTL_RESPONSE response; 44 45 itimer.it_value.tv_sec = RING_WAIT; 46 itimer.it_value.tv_usec = 0; 47 itimer.it_interval = itimer.it_value; 48 if (listen(sockt, 5) != 0) 49 p_error("Error on attempt to listen for caller"); 50 #ifdef MSG_EOR 51 /* copy new style sockaddr to old, swap family (short in old) */ 52 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 53 msg.addr.sa_family = htons(my_addr.sin_family); 54 #else 55 msg.addr = *(struct sockaddr *)&my_addr; 56 #endif 57 msg.id_num = htonl(-1); /* an impossible id_num */ 58 invitation_waiting = 1; 59 announce_invite(); 60 /* 61 * Shut off the automatic messages for a while, 62 * so we can use the interupt timer to resend the invitation 63 */ 64 end_msgs(); 65 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 66 message("Waiting for your party to respond"); 67 signal(SIGALRM, re_invite); 68 (void) setjmp(invitebuf); 69 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 70 if (errno == EINTR) 71 continue; 72 p_error("Unable to connect with your party"); 73 } 74 close(sockt); 75 sockt = new_sockt; 76 77 /* 78 * Have the daemons delete the invitations now that we 79 * have connected. 80 */ 81 current_state = "Waiting for your party to respond"; 82 start_msgs(); 83 84 msg.id_num = htonl(local_id); 85 ctl_transact(my_machine_addr, msg, DELETE, &response); 86 msg.id_num = htonl(remote_id); 87 ctl_transact(his_machine_addr, msg, DELETE, &response); 88 invitation_waiting = 0; 89 } 90 91 /* 92 * Routine called on interupt to re-invite the callee 93 */ 94 void 95 re_invite() 96 { 97 98 message("Ringing your party again"); 99 current_line++; 100 /* force a re-announce */ 101 msg.id_num = htonl(remote_id + 1); 102 announce_invite(); 103 longjmp(invitebuf, 1); 104 } 105 106 static char *answers[] = { 107 "answer #0", /* SUCCESS */ 108 "Your party is not logged on", /* NOT_HERE */ 109 "Target machine is too confused to talk to us", /* FAILED */ 110 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 111 "Your party is refusing messages", /* PERMISSION_REFUSED */ 112 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 113 "Target machine indicates protocol mismatch", /* BADVERSION */ 114 "Target machine indicates protocol botch (addr)",/* BADADDR */ 115 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 116 }; 117 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 118 119 /* 120 * Transmit the invitation and process the response 121 */ 122 announce_invite() 123 { 124 CTL_RESPONSE response; 125 126 current_state = "Trying to connect to your party's talk daemon"; 127 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 128 remote_id = response.id_num; 129 if (response.answer != SUCCESS) { 130 if (response.answer < NANSWERS) 131 message(answers[response.answer]); 132 quit(); 133 } 134 /* leave the actual invitation on my talk daemon */ 135 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 136 local_id = response.id_num; 137 } 138 139 /* 140 * Tell the daemon to remove your invitation 141 */ 142 send_delete() 143 { 144 145 msg.type = DELETE; 146 /* 147 * This is just a extra clean up, so just send it 148 * and don't wait for an answer 149 */ 150 msg.id_num = htonl(remote_id); 151 daemon_addr.sin_addr = his_machine_addr; 152 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 153 (struct sockaddr *)&daemon_addr, 154 sizeof (daemon_addr)) != sizeof(msg)) 155 perror("send_delete (remote)"); 156 msg.id_num = htonl(local_id); 157 daemon_addr.sin_addr = my_machine_addr; 158 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 159 (struct sockaddr *)&daemon_addr, 160 sizeof (daemon_addr)) != sizeof (msg)) 161 perror("send_delete (local)"); 162 } 163