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Annotation of 43BSD/ucb/talk/invite.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)invite.c   5.2 (Berkeley) 3/13/86";
        !             9: #endif not lint
        !            10: 
        !            11: #include "talk_ctl.h"
        !            12: #include <sys/time.h>
        !            13: #include <signal.h>
        !            14: #include <setjmp.h>
        !            15: 
        !            16: /*
        !            17:  * There wasn't an invitation waiting, so send a request containing
        !            18:  * our sockt address to the remote talk daemon so it can invite
        !            19:  * him 
        !            20:  */
        !            21: 
        !            22: /*
        !            23:  * The msg.id's for the invitations
        !            24:  * on the local and remote machines.
        !            25:  * These are used to delete the 
        !            26:  * invitations.
        !            27:  */
        !            28: int    local_id, remote_id;
        !            29: void   re_invite();
        !            30: jmp_buf invitebuf;
        !            31: 
        !            32: invite_remote()
        !            33: {
        !            34:        int nfd, read_mask, template, new_sockt;
        !            35:        struct itimerval itimer;
        !            36:        CTL_RESPONSE response;
        !            37: 
        !            38:        itimer.it_value.tv_sec = RING_WAIT;
        !            39:        itimer.it_value.tv_usec = 0;
        !            40:        itimer.it_interval = itimer.it_value;
        !            41:        if (listen(sockt, 5) != 0)
        !            42:                p_error("Error on attempt to listen for caller");
        !            43:        msg.addr = *(struct sockaddr *)&my_addr;
        !            44:        msg.addr.sa_family = htons(msg.addr.sa_family);
        !            45:        msg.id_num = htonl(-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 = htonl(local_id);
        !            73:        ctl_transact(my_machine_addr, msg, DELETE, &response);
        !            74:        msg.id_num = htonl(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 = htonl(remote_id + 1);
        !            90:        announce_invite();
        !            91:        longjmp(invitebuf, 1);
        !            92: }
        !            93: 
        !            94: static char *answers[] = {
        !            95:        "Your party is not logged on",                  /* NOT_HERE */
        !            96:        "Target machine does not recognize us",         /* MACHINE_UNKNOWN */
        !            97:        "Target machine can not handle remote talk",    /* UNKNOWN_REQUEST */
        !            98:        "Target machine is too confused to talk to us", /* FAILED */
        !            99:        "Your party is refusing messages",              /* PERMISSION_REFUSED */
        !           100:        "Target machine indicates protocol mismatch",   /* BADVERSION */
        !           101:        "Target machine indicates protocol botch (addr)",/* BADADDR */
        !           102:        "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */
        !           103: };
        !           104: #define        NANSWERS        (sizeof (answers) / sizeof (answers[0]))
        !           105: 
        !           106: /*
        !           107:  * Transmit the invitation and process the response
        !           108:  */
        !           109: announce_invite()
        !           110: {
        !           111:        CTL_RESPONSE response;
        !           112: 
        !           113:        current_state = "Trying to connect to your party's talk daemon";
        !           114:        ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
        !           115:        remote_id = response.id_num;
        !           116:        if (response.answer != SUCCESS) {
        !           117:                if (response.answer < NANSWERS)
        !           118:                        message(answers[response.answer]);
        !           119:                quit();
        !           120:        }
        !           121:        /* leave the actual invitation on my talk daemon */
        !           122:        ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
        !           123:        local_id = response.id_num;
        !           124: }
        !           125: 
        !           126: /*
        !           127:  * Tell the daemon to remove your invitation
        !           128:  */
        !           129: send_delete()
        !           130: {
        !           131: 
        !           132:        msg.type = DELETE;
        !           133:        /*
        !           134:         * This is just a extra clean up, so just send it
        !           135:         * and don't wait for an answer
        !           136:         */
        !           137:        msg.id_num = htonl(remote_id);
        !           138:        daemon_addr.sin_addr = his_machine_addr;
        !           139:        if (sendto(ctl_sockt, &msg, sizeof (msg), 0, &daemon_addr,
        !           140:            sizeof (daemon_addr)) != sizeof(msg))
        !           141:                perror("send_delete (remote)");
        !           142:        msg.id_num = htonl(local_id);
        !           143:        daemon_addr.sin_addr = my_machine_addr;
        !           144:        if (sendto(ctl_sockt, &msg, sizeof (msg), 0, &daemon_addr,
        !           145:            sizeof (daemon_addr)) != sizeof (msg))
        !           146:                perror("send_delete (local)");
        !           147: }

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