Annotation of src/usr.bin/talk/invite.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: invite.c,v 1.3 1994/12/09 02:14:18 jtc Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1983, 1993
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. All advertising materials mentioning features or use of this software
! 16: * must display the following acknowledgement:
! 17: * This product includes software developed by the University of
! 18: * California, Berkeley and its contributors.
! 19: * 4. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: */
! 35:
! 36: #ifndef lint
! 37: #if 0
! 38: static char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93";
! 39: #endif
! 40: static char rcsid[] = "$NetBSD: invite.c,v 1.3 1994/12/09 02:14:18 jtc Exp $";
! 41: #endif /* not lint */
! 42:
! 43: #include <sys/types.h>
! 44: #include <sys/socket.h>
! 45: #include <sys/time.h>
! 46: #include <signal.h>
! 47: #include <netinet/in.h>
! 48: #include <protocols/talkd.h>
! 49: #include <errno.h>
! 50: #include <setjmp.h>
! 51: #include "talk_ctl.h"
! 52: #include "talk.h"
! 53:
! 54: /*
! 55: * There wasn't an invitation waiting, so send a request containing
! 56: * our sockt address to the remote talk daemon so it can invite
! 57: * him
! 58: */
! 59:
! 60: /*
! 61: * The msg.id's for the invitations
! 62: * on the local and remote machines.
! 63: * These are used to delete the
! 64: * invitations.
! 65: */
! 66: int local_id, remote_id;
! 67: void re_invite();
! 68: jmp_buf invitebuf;
! 69:
! 70: invite_remote()
! 71: {
! 72: int nfd, read_mask, template, new_sockt;
! 73: struct itimerval itimer;
! 74: CTL_RESPONSE response;
! 75:
! 76: itimer.it_value.tv_sec = RING_WAIT;
! 77: itimer.it_value.tv_usec = 0;
! 78: itimer.it_interval = itimer.it_value;
! 79: if (listen(sockt, 5) != 0)
! 80: p_error("Error on attempt to listen for caller");
! 81: #ifdef MSG_EOR
! 82: /* copy new style sockaddr to old, swap family (short in old) */
! 83: msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/
! 84: msg.addr.sa_family = htons(my_addr.sin_family);
! 85: #else
! 86: msg.addr = *(struct sockaddr *)&my_addr;
! 87: #endif
! 88: msg.id_num = htonl(-1); /* an impossible id_num */
! 89: invitation_waiting = 1;
! 90: announce_invite();
! 91: /*
! 92: * Shut off the automatic messages for a while,
! 93: * so we can use the interupt timer to resend the invitation
! 94: */
! 95: end_msgs();
! 96: setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
! 97: message("Waiting for your party to respond");
! 98: signal(SIGALRM, re_invite);
! 99: (void) setjmp(invitebuf);
! 100: while ((new_sockt = accept(sockt, 0, 0)) < 0) {
! 101: if (errno == EINTR)
! 102: continue;
! 103: p_error("Unable to connect with your party");
! 104: }
! 105: close(sockt);
! 106: sockt = new_sockt;
! 107:
! 108: /*
! 109: * Have the daemons delete the invitations now that we
! 110: * have connected.
! 111: */
! 112: current_state = "Waiting for your party to respond";
! 113: start_msgs();
! 114:
! 115: msg.id_num = htonl(local_id);
! 116: ctl_transact(my_machine_addr, msg, DELETE, &response);
! 117: msg.id_num = htonl(remote_id);
! 118: ctl_transact(his_machine_addr, msg, DELETE, &response);
! 119: invitation_waiting = 0;
! 120: }
! 121:
! 122: /*
! 123: * Routine called on interupt to re-invite the callee
! 124: */
! 125: void
! 126: re_invite()
! 127: {
! 128:
! 129: message("Ringing your party again");
! 130: current_line++;
! 131: /* force a re-announce */
! 132: msg.id_num = htonl(remote_id + 1);
! 133: announce_invite();
! 134: longjmp(invitebuf, 1);
! 135: }
! 136:
! 137: static char *answers[] = {
! 138: "answer #0", /* SUCCESS */
! 139: "Your party is not logged on", /* NOT_HERE */
! 140: "Target machine is too confused to talk to us", /* FAILED */
! 141: "Target machine does not recognize us", /* MACHINE_UNKNOWN */
! 142: "Your party is refusing messages", /* PERMISSION_REFUSED */
! 143: "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */
! 144: "Target machine indicates protocol mismatch", /* BADVERSION */
! 145: "Target machine indicates protocol botch (addr)",/* BADADDR */
! 146: "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */
! 147: };
! 148: #define NANSWERS (sizeof (answers) / sizeof (answers[0]))
! 149:
! 150: /*
! 151: * Transmit the invitation and process the response
! 152: */
! 153: announce_invite()
! 154: {
! 155: CTL_RESPONSE response;
! 156:
! 157: current_state = "Trying to connect to your party's talk daemon";
! 158: ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
! 159: remote_id = response.id_num;
! 160: if (response.answer != SUCCESS) {
! 161: if (response.answer < NANSWERS)
! 162: message(answers[response.answer]);
! 163: quit();
! 164: }
! 165: /* leave the actual invitation on my talk daemon */
! 166: ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
! 167: local_id = response.id_num;
! 168: }
! 169:
! 170: /*
! 171: * Tell the daemon to remove your invitation
! 172: */
! 173: send_delete()
! 174: {
! 175:
! 176: msg.type = DELETE;
! 177: /*
! 178: * This is just a extra clean up, so just send it
! 179: * and don't wait for an answer
! 180: */
! 181: msg.id_num = htonl(remote_id);
! 182: daemon_addr.sin_addr = his_machine_addr;
! 183: if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
! 184: (struct sockaddr *)&daemon_addr,
! 185: sizeof (daemon_addr)) != sizeof(msg))
! 186: perror("send_delete (remote)");
! 187: msg.id_num = htonl(local_id);
! 188: daemon_addr.sin_addr = my_machine_addr;
! 189: if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
! 190: (struct sockaddr *)&daemon_addr,
! 191: sizeof (daemon_addr)) != sizeof (msg))
! 192: perror("send_delete (local)");
! 193: }
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