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Annotation of 43BSDTahoe/etc/talkd/process.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 the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)process.c  5.6 (Berkeley) 6/18/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: /*
        !            23:  * process.c handles the requests, which can be of three types:
        !            24:  *     ANNOUNCE - announce to a user that a talk is wanted
        !            25:  *     LEAVE_INVITE - insert the request into the table
        !            26:  *     LOOK_UP - look up to see if a request is waiting in
        !            27:  *               in the table for the local user
        !            28:  *     DELETE - delete invitation
        !            29:  */
        !            30: #include <sys/types.h>
        !            31: #include <sys/stat.h>
        !            32: #include <stdio.h>
        !            33: #include <syslog.h>
        !            34: #include <netdb.h>
        !            35: #include <netinet/in.h>
        !            36: 
        !            37: #include <protocols/talkd.h>
        !            38: 
        !            39: char   *strcpy();
        !            40: CTL_MSG *find_request();
        !            41: CTL_MSG *find_match();
        !            42: 
        !            43: process_request(mp, rp)
        !            44:        register CTL_MSG *mp;
        !            45:        register CTL_RESPONSE *rp;
        !            46: {
        !            47:        register CTL_MSG *ptr;
        !            48:        extern int debug;
        !            49: 
        !            50:        rp->vers = TALK_VERSION;
        !            51:        rp->type = mp->type;
        !            52:        rp->id_num = htonl(0);
        !            53:        if (mp->vers != TALK_VERSION) {
        !            54:                syslog(LOG_WARNING, "Bad protocol version %d", mp->vers);
        !            55:                rp->answer = BADVERSION;
        !            56:                return;
        !            57:        }
        !            58:        mp->id_num = ntohl(mp->id_num);
        !            59:        mp->addr.sa_family = ntohs(mp->addr.sa_family);
        !            60:        if (mp->addr.sa_family != AF_INET) {
        !            61:                syslog(LOG_WARNING, "Bad address, family %d",
        !            62:                    mp->addr.sa_family);
        !            63:                rp->answer = BADADDR;
        !            64:                return;
        !            65:        }
        !            66:        mp->ctl_addr.sa_family = ntohs(mp->ctl_addr.sa_family);
        !            67:        if (mp->ctl_addr.sa_family != AF_INET) {
        !            68:                syslog(LOG_WARNING, "Bad control address, family %d",
        !            69:                    mp->ctl_addr.sa_family);
        !            70:                rp->answer = BADCTLADDR;
        !            71:                return;
        !            72:        }
        !            73:        mp->pid = ntohl(mp->pid);
        !            74:        if (debug)
        !            75:                print_request("process_request", mp);
        !            76:        switch (mp->type) {
        !            77: 
        !            78:        case ANNOUNCE:
        !            79:                do_announce(mp, rp);
        !            80:                break;
        !            81: 
        !            82:        case LEAVE_INVITE:
        !            83:                ptr = find_request(mp);
        !            84:                if (ptr != (CTL_MSG *)0) {
        !            85:                        rp->id_num = htonl(ptr->id_num);
        !            86:                        rp->answer = SUCCESS;
        !            87:                } else
        !            88:                        insert_table(mp, rp);
        !            89:                break;
        !            90: 
        !            91:        case LOOK_UP:
        !            92:                ptr = find_match(mp);
        !            93:                if (ptr != (CTL_MSG *)0) {
        !            94:                        rp->id_num = htonl(ptr->id_num);
        !            95:                        rp->addr = ptr->addr;
        !            96:                        rp->addr.sa_family = htons(ptr->addr.sa_family);
        !            97:                        rp->answer = SUCCESS;
        !            98:                } else
        !            99:                        rp->answer = NOT_HERE;
        !           100:                break;
        !           101: 
        !           102:        case DELETE:
        !           103:                rp->answer = delete_invite(mp->id_num);
        !           104:                break;
        !           105: 
        !           106:        default:
        !           107:                rp->answer = UNKNOWN_REQUEST;
        !           108:                break;
        !           109:        }
        !           110:        if (debug)
        !           111:                print_response("process_request", rp);
        !           112: }
        !           113: 
        !           114: do_announce(mp, rp)
        !           115:        register CTL_MSG *mp;
        !           116:        CTL_RESPONSE *rp;
        !           117: {
        !           118:        struct hostent *hp;
        !           119:        CTL_MSG *ptr;
        !           120:        int result;
        !           121: 
        !           122:        /* see if the user is logged */
        !           123:        result = find_user(mp->r_name, mp->r_tty);
        !           124:        if (result != SUCCESS) {
        !           125:                rp->answer = result;
        !           126:                return;
        !           127:        }
        !           128: #define        satosin(sa)     ((struct sockaddr_in *)(sa))
        !           129:        hp = gethostbyaddr(&satosin(&mp->ctl_addr)->sin_addr,
        !           130:                sizeof (struct in_addr), AF_INET);
        !           131:        if (hp == (struct hostent *)0) {
        !           132:                rp->answer = MACHINE_UNKNOWN;
        !           133:                return;
        !           134:        }
        !           135:        ptr = find_request(mp);
        !           136:        if (ptr == (CTL_MSG *) 0) {
        !           137:                insert_table(mp, rp);
        !           138:                rp->answer = announce(mp, hp->h_name);
        !           139:                return;
        !           140:        }
        !           141:        if (mp->id_num > ptr->id_num) {
        !           142:                /*
        !           143:                 * This is an explicit re-announce, so update the id_num
        !           144:                 * field to avoid duplicates and re-announce the talk.
        !           145:                 */
        !           146:                ptr->id_num = new_id();
        !           147:                rp->id_num = htonl(ptr->id_num);
        !           148:                rp->answer = announce(mp, hp->h_name);
        !           149:        } else {
        !           150:                /* a duplicated request, so ignore it */
        !           151:                rp->id_num = htonl(ptr->id_num);
        !           152:                rp->answer = SUCCESS;
        !           153:        }
        !           154: }
        !           155: 
        !           156: #include <utmp.h>
        !           157: 
        !           158: /*
        !           159:  * Search utmp for the local user
        !           160:  */
        !           161: find_user(name, tty)
        !           162:        char *name, *tty;
        !           163: {
        !           164:        struct utmp ubuf;
        !           165:        int status;
        !           166:        FILE *fd;
        !           167:        struct stat statb;
        !           168:        char ftty[20];
        !           169: 
        !           170:        if ((fd = fopen("/etc/utmp", "r")) == NULL) {
        !           171:                perror("Can't open /etc/utmp");
        !           172:                return (FAILED);
        !           173:        }
        !           174: #define SCMPN(a, b)    strncmp(a, b, sizeof (a))
        !           175:        status = NOT_HERE;
        !           176:        (void) strcpy(ftty, "/dev/");
        !           177:        while (fread((char *) &ubuf, sizeof ubuf, 1, fd) == 1)
        !           178:                if (SCMPN(ubuf.ut_name, name) == 0) {
        !           179:                        if (*tty == '\0') {
        !           180:                                status = PERMISSION_DENIED;
        !           181:                                /* no particular tty was requested */
        !           182:                                (void) strcpy(ftty+5, ubuf.ut_line);
        !           183:                                if (stat(ftty,&statb) == 0) {
        !           184:                                        if (!(statb.st_mode & 020))
        !           185:                                                continue;
        !           186:                                        (void) strcpy(tty, ubuf.ut_line);
        !           187:                                        status = SUCCESS;
        !           188:                                        break;
        !           189:                                }
        !           190:                        }
        !           191:                        if (strcmp(ubuf.ut_line, tty) == 0) {
        !           192:                                status = SUCCESS;
        !           193:                                break;
        !           194:                        }
        !           195:                }
        !           196:        fclose(fd);
        !           197:        return (status);
        !           198: }

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