Annotation of src/usr.bin/talk/look_up.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: look_up.c,v 1.3 1994/12/09 02:14:21 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[] = "@(#)look_up.c 8.1 (Berkeley) 6/6/93";
! 39: #endif
! 40: static char rcsid[] = "$NetBSD: look_up.c,v 1.3 1994/12/09 02:14:21 jtc Exp $";
! 41: #endif /* not lint */
! 42:
! 43: #include <sys/types.h>
! 44: #include <sys/socket.h>
! 45: #include <netinet/in.h>
! 46: #include <protocols/talkd.h>
! 47: #include <errno.h>
! 48: #include "talk_ctl.h"
! 49: #include "talk.h"
! 50:
! 51: /*
! 52: * See if the local daemon has an invitation for us.
! 53: */
! 54: check_local()
! 55: {
! 56: CTL_RESPONSE response;
! 57: register CTL_RESPONSE *rp = &response;
! 58:
! 59: /* the rest of msg was set up in get_names */
! 60: #ifdef MSG_EOR
! 61: /* copy new style sockaddr to old, swap family (short in old) */
! 62: msg.ctl_addr = *(struct osockaddr *)&ctl_addr;
! 63: msg.ctl_addr.sa_family = htons(ctl_addr.sin_family);
! 64: #else
! 65: msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
! 66: #endif
! 67: /* must be initiating a talk */
! 68: if (!look_for_invite(rp))
! 69: return (0);
! 70: /*
! 71: * There was an invitation waiting for us,
! 72: * so connect with the other (hopefully waiting) party
! 73: */
! 74: current_state = "Waiting to connect with caller";
! 75: do {
! 76: if (rp->addr.sa_family != AF_INET)
! 77: p_error("Response uses invalid network address");
! 78: errno = 0;
! 79: if (connect(sockt,
! 80: (struct sockaddr *)&rp->addr, sizeof (rp->addr)) != -1)
! 81: return (1);
! 82: } while (errno == EINTR);
! 83: if (errno == ECONNREFUSED) {
! 84: /*
! 85: * The caller gave up, but his invitation somehow
! 86: * was not cleared. Clear it and initiate an
! 87: * invitation. (We know there are no newer invitations,
! 88: * the talkd works LIFO.)
! 89: */
! 90: ctl_transact(his_machine_addr, msg, DELETE, rp);
! 91: close(sockt);
! 92: open_sockt();
! 93: return (0);
! 94: }
! 95: p_error("Unable to connect with initiator");
! 96: /*NOTREACHED*/
! 97: }
! 98:
! 99: /*
! 100: * Look for an invitation on 'machine'
! 101: */
! 102: look_for_invite(rp)
! 103: CTL_RESPONSE *rp;
! 104: {
! 105: struct in_addr machine_addr;
! 106:
! 107: current_state = "Checking for invitation on caller's machine";
! 108: ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
! 109: /* the switch is for later options, such as multiple invitations */
! 110: switch (rp->answer) {
! 111:
! 112: case SUCCESS:
! 113: msg.id_num = htonl(rp->id_num);
! 114: return (1);
! 115:
! 116: default:
! 117: /* there wasn't an invitation waiting for us */
! 118: return (0);
! 119: }
! 120: }
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