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Annotation of 43BSDReno/usr.bin/talk/invite.c, revision 1.1

1.1     ! root        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: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)invite.c   5.7 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #include "talk_ctl.h"
        !            25: #include <sys/time.h>
        !            26: #include <signal.h>
        !            27: #include <setjmp.h>
        !            28: 
        !            29: /*
        !            30:  * There wasn't an invitation waiting, so send a request containing
        !            31:  * our sockt address to the remote talk daemon so it can invite
        !            32:  * him 
        !            33:  */
        !            34: 
        !            35: /*
        !            36:  * The msg.id's for the invitations
        !            37:  * on the local and remote machines.
        !            38:  * These are used to delete the 
        !            39:  * invitations.
        !            40:  */
        !            41: int    local_id, remote_id;
        !            42: void   re_invite();
        !            43: jmp_buf invitebuf;
        !            44: 
        !            45: invite_remote()
        !            46: {
        !            47:        int nfd, read_mask, template, new_sockt;
        !            48:        struct itimerval itimer;
        !            49:        CTL_RESPONSE response;
        !            50: 
        !            51:        itimer.it_value.tv_sec = RING_WAIT;
        !            52:        itimer.it_value.tv_usec = 0;
        !            53:        itimer.it_interval = itimer.it_value;
        !            54:        if (listen(sockt, 5) != 0)
        !            55:                p_error("Error on attempt to listen for caller");
        !            56: #ifdef MSG_EOR
        !            57:        /* copy new style sockaddr to old, swap family (short in old) */
        !            58:        msg.addr = *(struct osockaddr *)&my_addr;  /* XXX new to old  style*/
        !            59:        msg.addr.sa_family = htons(my_addr.sin_family);
        !            60: #else
        !            61:        msg.addr = *(struct sockaddr *)&my_addr;
        !            62: #endif
        !            63:        msg.id_num = htonl(-1);         /* an impossible id_num */
        !            64:        invitation_waiting = 1;
        !            65:        announce_invite();
        !            66:        /*
        !            67:         * Shut off the automatic messages for a while,
        !            68:         * so we can use the interupt timer to resend the invitation
        !            69:         */
        !            70:        end_msgs();
        !            71:        setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
        !            72:        message("Waiting for your party to respond");
        !            73:        signal(SIGALRM, re_invite);
        !            74:        (void) setjmp(invitebuf);
        !            75:        while ((new_sockt = accept(sockt, 0, 0)) < 0) {
        !            76:                if (errno == EINTR)
        !            77:                        continue;
        !            78:                p_error("Unable to connect with your party");
        !            79:        }
        !            80:        close(sockt);
        !            81:        sockt = new_sockt;
        !            82: 
        !            83:        /*
        !            84:         * Have the daemons delete the invitations now that we
        !            85:         * have connected.
        !            86:         */
        !            87:        current_state = "Waiting for your party to respond";
        !            88:        start_msgs();
        !            89: 
        !            90:        msg.id_num = htonl(local_id);
        !            91:        ctl_transact(my_machine_addr, msg, DELETE, &response);
        !            92:        msg.id_num = htonl(remote_id);
        !            93:        ctl_transact(his_machine_addr, msg, DELETE, &response);
        !            94:        invitation_waiting = 0;
        !            95: }
        !            96: 
        !            97: /*
        !            98:  * Routine called on interupt to re-invite the callee
        !            99:  */
        !           100: void
        !           101: re_invite()
        !           102: {
        !           103: 
        !           104:        message("Ringing your party again");
        !           105:        current_line++;
        !           106:        /* force a re-announce */
        !           107:        msg.id_num = htonl(remote_id + 1);
        !           108:        announce_invite();
        !           109:        longjmp(invitebuf, 1);
        !           110: }
        !           111: 
        !           112: static char *answers[] = {
        !           113:        "answer #0",                                    /* SUCCESS */
        !           114:        "Your party is not logged on",                  /* NOT_HERE */
        !           115:        "Target machine is too confused to talk to us", /* FAILED */
        !           116:        "Target machine does not recognize us",         /* MACHINE_UNKNOWN */
        !           117:        "Your party is refusing messages",              /* PERMISSION_REFUSED */
        !           118:        "Target machine can not handle remote talk",    /* UNKNOWN_REQUEST */
        !           119:        "Target machine indicates protocol mismatch",   /* BADVERSION */
        !           120:        "Target machine indicates protocol botch (addr)",/* BADADDR */
        !           121:        "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */
        !           122: };
        !           123: #define        NANSWERS        (sizeof (answers) / sizeof (answers[0]))
        !           124: 
        !           125: /*
        !           126:  * Transmit the invitation and process the response
        !           127:  */
        !           128: announce_invite()
        !           129: {
        !           130:        CTL_RESPONSE response;
        !           131: 
        !           132:        current_state = "Trying to connect to your party's talk daemon";
        !           133:        ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
        !           134:        remote_id = response.id_num;
        !           135:        if (response.answer != SUCCESS) {
        !           136:                if (response.answer < NANSWERS)
        !           137:                        message(answers[response.answer]);
        !           138:                quit();
        !           139:        }
        !           140:        /* leave the actual invitation on my talk daemon */
        !           141:        ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
        !           142:        local_id = response.id_num;
        !           143: }
        !           144: 
        !           145: /*
        !           146:  * Tell the daemon to remove your invitation
        !           147:  */
        !           148: send_delete()
        !           149: {
        !           150: 
        !           151:        msg.type = DELETE;
        !           152:        /*
        !           153:         * This is just a extra clean up, so just send it
        !           154:         * and don't wait for an answer
        !           155:         */
        !           156:        msg.id_num = htonl(remote_id);
        !           157:        daemon_addr.sin_addr = his_machine_addr;
        !           158:        if (sendto(ctl_sockt, &msg, sizeof (msg), 0, &daemon_addr,
        !           159:            sizeof (daemon_addr)) != sizeof(msg))
        !           160:                perror("send_delete (remote)");
        !           161:        msg.id_num = htonl(local_id);
        !           162:        daemon_addr.sin_addr = my_machine_addr;
        !           163:        if (sendto(ctl_sockt, &msg, sizeof (msg), 0, &daemon_addr,
        !           164:            sizeof (daemon_addr)) != sizeof (msg))
        !           165:                perror("send_delete (local)");
        !           166: }

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