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Annotation of 43BSDReno/old/talk/talkd/process.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[] = "@(#)process.c  5.2 (Berkeley) 6/8/85";
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12:  * process.c handles the requests, which can be of three types:
        !            13:  *     ANNOUNCE - announce to a user that a talk is wanted
        !            14:  *     LEAVE_INVITE - insert the request into the table
        !            15:  *     LOOK_UP - look up to see if a request is waiting in
        !            16:  *               in the table for the local user
        !            17:  *     DELETE - delete invitation
        !            18:  */
        !            19: #include "ctl.h"
        !            20: #include <sys/stat.h>
        !            21: #include <stdio.h>
        !            22: 
        !            23: char *strcpy();
        !            24: CTL_MSG *find_request();
        !            25: CTL_MSG *find_match();
        !            26: 
        !            27: process_request(request, response)
        !            28:        CTL_MSG *request;
        !            29:        CTL_RESPONSE *response;
        !            30: {
        !            31:        CTL_MSG *ptr;
        !            32: 
        !            33:        response->type = request->type;
        !            34:        response->id_num = 0;
        !            35: 
        !            36:        switch (request->type) {
        !            37: 
        !            38:        case ANNOUNCE :
        !            39:                do_announce(request, response);
        !            40:                break;
        !            41: 
        !            42:        case LEAVE_INVITE :
        !            43:                ptr = find_request(request);
        !            44:                if (ptr != (CTL_MSG *) 0) {
        !            45:                        response->id_num = ptr->id_num;
        !            46:                        response->answer = SUCCESS;
        !            47:                } else
        !            48:                        insert_table(request, response);
        !            49:                break;
        !            50: 
        !            51:        case LOOK_UP :
        !            52:                ptr = find_match(request);
        !            53:                if (ptr != (CTL_MSG *) 0) {
        !            54:                        response->id_num = ptr->id_num;
        !            55:                        response->addr = ptr->addr;
        !            56:                        response->answer = SUCCESS;
        !            57:                } else
        !            58:                        response->answer = NOT_HERE;
        !            59:                break;
        !            60: 
        !            61:        case DELETE :
        !            62:                response->answer = delete_invite(request->id_num);
        !            63:                break;
        !            64: 
        !            65:        default :
        !            66:                response->answer = UNKNOWN_REQUEST;
        !            67:                break;
        !            68:        }
        !            69: }
        !            70: 
        !            71: struct hostent *gethostbyaddr();
        !            72: 
        !            73: do_announce(request, response)
        !            74:        CTL_MSG *request;
        !            75:        CTL_RESPONSE *response;
        !            76: {
        !            77:        struct hostent *hp;
        !            78:        CTL_MSG *ptr;
        !            79:        int result;
        !            80: 
        !            81:        /* see if the user is logged */
        !            82:        result = find_user(request->r_name, request->r_tty);
        !            83:        if (result != SUCCESS) {
        !            84:                response->answer = result;
        !            85:                return;
        !            86:        }
        !            87:        hp = gethostbyaddr(&request->ctl_addr.sin_addr,
        !            88:                sizeof(struct in_addr), AF_INET);
        !            89:        if (hp == (struct hostent *)0) {
        !            90:                response->answer = MACHINE_UNKNOWN;
        !            91:                return;
        !            92:        }
        !            93:        ptr = find_request(request);
        !            94:        if (ptr == (CTL_MSG *) 0) {
        !            95:                insert_table(request,response);
        !            96:                response->answer = announce(request, hp->h_name);
        !            97:                return;
        !            98:        }
        !            99:        if (request->id_num > ptr->id_num) {
        !           100:                /*
        !           101:                 * this is an explicit re-announce, so update the id_num
        !           102:                 * field to avoid duplicates and re-announce the talk 
        !           103:                 */
        !           104:                ptr->id_num = response->id_num = new_id();
        !           105:                response->answer = announce(request, hp->h_name);
        !           106:                return;
        !           107:        }
        !           108:        /* a duplicated request, so ignore it */
        !           109:        response->id_num = ptr->id_num;
        !           110:        response->answer = SUCCESS;
        !           111: }
        !           112: 
        !           113: #include <utmp.h>
        !           114: 
        !           115: /*
        !           116:  * Search utmp for the local user
        !           117:  */
        !           118: find_user(name, tty)
        !           119:        char *name;
        !           120:        char *tty;
        !           121: {
        !           122:        struct utmp ubuf;
        !           123:        int status;
        !           124:        FILE *fd;
        !           125:        struct stat statb;
        !           126:        char ftty[20];
        !           127: 
        !           128:        if ((fd = fopen("/etc/utmp", "r")) == NULL) {
        !           129:                perror("Can't open /etc/utmp");
        !           130:                return (FAILED);
        !           131:        }
        !           132: #define SCMPN(a, b)    strncmp(a, b, sizeof (a))
        !           133:        status = NOT_HERE;
        !           134:        (void) strcpy(ftty, "/dev/");
        !           135:        while (fread((char *) &ubuf, sizeof ubuf, 1, fd) == 1)
        !           136:                if (SCMPN(ubuf.ut_name, name) == 0) {
        !           137:                        if (*tty == '\0') {
        !           138:                                status = PERMISSION_DENIED;
        !           139:                                /* no particular tty was requested */
        !           140:                                (void) strcpy(ftty+5, ubuf.ut_line);
        !           141:                                if (stat(ftty,&statb) == 0) {
        !           142:                                        if (!(statb.st_mode & 020))
        !           143:                                                continue;
        !           144:                                        (void) strcpy(tty, ubuf.ut_line);
        !           145:                                        status = SUCCESS;
        !           146:                                        break;
        !           147:                                }
        !           148:                        }
        !           149:                        if (strcmp(ubuf.ut_line, tty) == 0) {
        !           150:                                status = SUCCESS;
        !           151:                                break;
        !           152:                        }
        !           153:                }
        !           154:        fclose(fd);
        !           155:        return (status);
        !           156: }

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