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Annotation of 43BSDReno/usr.bin/tn3270/sys_curses/system.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 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[] = "@(#)system.c   4.3 (Berkeley) 9/2/89";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include <sys/types.h>
        !            23: 
        !            24: #if     defined(pyr)
        !            25: #define fd_set fdset_t
        !            26: #endif  /* defined(pyr) */
        !            27: 
        !            28: /*
        !            29:  * Wouldn't it be nice if these REALLY were in <sys/inode.h>?  Or,
        !            30:  * equivalently, if <sys/inode.h> REALLY existed?
        !            31:  */
        !            32: #define        IREAD   00400
        !            33: #define        IWRITE  00200
        !            34: 
        !            35: #include <sys/file.h>
        !            36: #include <sys/time.h>
        !            37: #include <sys/socket.h>
        !            38: #include <netinet/in.h>
        !            39: #include <sys/wait.h>
        !            40: 
        !            41: #include <errno.h>
        !            42: extern int errno;
        !            43: 
        !            44: #include <netdb.h>
        !            45: #include <signal.h>
        !            46: #include <stdio.h>
        !            47: #include <pwd.h>
        !            48: 
        !            49: #include "../general/general.h"
        !            50: #include "../ctlr/api.h"
        !            51: #include "../api/api_exch.h"
        !            52: 
        !            53: #include "../general/globals.h"
        !            54: 
        !            55: #ifndef        FD_SETSIZE
        !            56: /*
        !            57:  * The following is defined just in case someone should want to run
        !            58:  * this telnet on a 4.2 system.
        !            59:  *
        !            60:  */
        !            61: 
        !            62: #define        FD_SET(n, p)    ((p)->fds_bits[0] |= (1<<(n)))
        !            63: #define        FD_CLR(n, p)    ((p)->fds_bits[0] &= ~(1<<(n)))
        !            64: #define        FD_ISSET(n, p)  ((p)->fds_bits[0] & (1<<(n)))
        !            65: #define FD_ZERO(p)     ((p)->fds_bits[0] = 0)
        !            66: 
        !            67: #endif
        !            68: 
        !            69: static int shell_pid = 0;
        !            70: static char key[50];                   /* Actual key */
        !            71: static char *keyname;                  /* Name of file with key in it */
        !            72: 
        !            73: static char *ourENVlist[200];          /* Lots of room */
        !            74: 
        !            75: static int
        !            76:     sock = -1,                         /* Connected socket */
        !            77:     serversock;                                /* Server (listening) socket */
        !            78: 
        !            79: static enum { DEAD, UNCONNECTED, CONNECTED } state;
        !            80: 
        !            81: static long
        !            82:     storage_location;          /* Address we have */
        !            83: static short
        !            84:     storage_length = 0;                /* Length we have */
        !            85: static int
        !            86:     storage_must_send = 0,     /* Storage belongs on other side of wire */
        !            87:     storage_accessed = 0;      /* The storage is accessed (so leave alone)! */
        !            88: 
        !            89: static long storage[1000];
        !            90: 
        !            91: static union REGS inputRegs;
        !            92: static struct SREGS inputSregs;
        !            93: 
        !            94: extern int apitrace;
        !            95: 
        !            96: static void
        !            97: kill_connection()
        !            98: {
        !            99:     state = UNCONNECTED;
        !           100:     if (sock != -1) {
        !           101:        (void) close(sock);
        !           102:        sock = -1;
        !           103:     }
        !           104: }
        !           105: 
        !           106: 
        !           107: static int
        !           108: nextstore()
        !           109: {
        !           110:     struct storage_descriptor sd;
        !           111: 
        !           112:     if (api_exch_intype(EXCH_TYPE_STORE_DESC, sizeof sd, (char *)&sd) == -1) {
        !           113:        storage_length = 0;
        !           114:        return -1;
        !           115:     }
        !           116:     storage_length = sd.length;
        !           117:     storage_location = sd.location;
        !           118:     if (storage_length > sizeof storage) {
        !           119:        fprintf(stderr, "API client tried to send too much storage (%d).\n",
        !           120:                storage_length);
        !           121:        storage_length = 0;
        !           122:        return -1;
        !           123:     }
        !           124:     if (api_exch_intype(EXCH_TYPE_BYTES, storage_length, (char *)storage)
        !           125:                                                        == -1) {
        !           126:        storage_length = 0;
        !           127:        return -1;
        !           128:     }
        !           129:     return 0;
        !           130: }
        !           131: 
        !           132: 
        !           133: static int
        !           134: doreject(message)
        !           135: char   *message;
        !           136: {
        !           137:     struct storage_descriptor sd;
        !           138:     int length = strlen(message);
        !           139: 
        !           140:     if (api_exch_outcommand(EXCH_CMD_REJECTED) == -1) {
        !           141:        return -1;
        !           142:     }
        !           143:     sd.length = length;
        !           144:     if (api_exch_outtype(EXCH_TYPE_STORE_DESC, sizeof sd, (char *)&sd) == -1) {
        !           145:        return -1;
        !           146:     }
        !           147:     if (api_exch_outtype(EXCH_TYPE_BYTES, length, message) == -1) {
        !           148:        return -1;
        !           149:     }
        !           150:     return 0;
        !           151: }
        !           152: 
        !           153: 
        !           154: /*
        !           155:  * doassociate()
        !           156:  *
        !           157:  * Negotiate with the other side and try to do something.
        !           158:  *
        !           159:  * Returns:
        !           160:  *
        !           161:  *     -1:     Error in processing
        !           162:  *      0:     Invalid password entered
        !           163:  *      1:     Association OK
        !           164:  */
        !           165: 
        !           166: static int
        !           167: doassociate()
        !           168: {
        !           169:     struct passwd *pwent;
        !           170:     char
        !           171:        promptbuf[100],
        !           172:        buffer[200];
        !           173:     struct storage_descriptor sd;
        !           174:     extern char *crypt();
        !           175: 
        !           176:     if (api_exch_intype(EXCH_TYPE_STORE_DESC, sizeof sd, (char *)&sd) == -1) {
        !           177:        return -1;
        !           178:     }
        !           179:     sd.length = sd.length;
        !           180:     if (sd.length > sizeof buffer) {
        !           181:        doreject("(internal error) Authentication key too long");
        !           182:        return -1;
        !           183:     }
        !           184:     if (api_exch_intype(EXCH_TYPE_BYTES, sd.length, buffer) == -1) {
        !           185:        return -1;
        !           186:     }
        !           187:     buffer[sd.length] = 0;
        !           188: 
        !           189:     if (strcmp(buffer, key) != 0) {
        !           190: #if    (!defined(sun)) || defined(BSD) && (BSD >= 43)
        !           191:        extern uid_t geteuid();
        !           192: #endif /* (!defined(sun)) || defined(BSD) && (BSD >= 43) */
        !           193: 
        !           194:        if ((pwent = getpwuid((int)geteuid())) == 0) {
        !           195:            return -1;
        !           196:        }
        !           197:        sprintf(promptbuf, "Enter password for user %s:", pwent->pw_name);
        !           198:        if (api_exch_outcommand(EXCH_CMD_SEND_AUTH) == -1) {
        !           199:            return -1;
        !           200:        }
        !           201:        sd.length = strlen(promptbuf);
        !           202:        if (api_exch_outtype(EXCH_TYPE_STORE_DESC, sizeof sd, (char *)&sd)
        !           203:                                                                        == -1) {
        !           204:            return -1;
        !           205:        }
        !           206:        if (api_exch_outtype(EXCH_TYPE_BYTES, strlen(promptbuf), promptbuf)
        !           207:                                                                        == -1) {
        !           208:            return -1;
        !           209:        }
        !           210:        sd.length = strlen(pwent->pw_name);
        !           211:        if (api_exch_outtype(EXCH_TYPE_STORE_DESC, sizeof sd, (char *)&sd)
        !           212:                                                                        == -1) {
        !           213:            return -1;
        !           214:        }
        !           215:        if (api_exch_outtype(EXCH_TYPE_BYTES,
        !           216:                            strlen(pwent->pw_name), pwent->pw_name) == -1) {
        !           217:            return -1;
        !           218:        }
        !           219:        if (api_exch_incommand(EXCH_CMD_AUTH) == -1) {
        !           220:            return -1;
        !           221:        }
        !           222:        if (api_exch_intype(EXCH_TYPE_STORE_DESC, sizeof sd, (char *)&sd)
        !           223:                                                                        == -1) {
        !           224:            return -1;
        !           225:        }
        !           226:        sd.length = sd.length;
        !           227:        if (sd.length > sizeof buffer) {
        !           228:            doreject("Password entered was too long");
        !           229:            return -1;
        !           230:        }
        !           231:        if (api_exch_intype(EXCH_TYPE_BYTES, sd.length, buffer) == -1) {
        !           232:            return -1;
        !           233:        }
        !           234:        buffer[sd.length] = 0;
        !           235: 
        !           236:        /* Is this the correct password? */
        !           237:        if (strlen(pwent->pw_name)) {
        !           238:            char *ptr;
        !           239:            int i;
        !           240: 
        !           241:            ptr = pwent->pw_name;
        !           242:            i = 0;
        !           243:            while (i < sd.length) {
        !           244:                buffer[i++] ^= *ptr++;
        !           245:                if (*ptr == 0) {
        !           246:                    ptr = pwent->pw_name;
        !           247:                }
        !           248:            }
        !           249:        }
        !           250:        if (strcmp(crypt(buffer, pwent->pw_passwd), pwent->pw_passwd) != 0) {
        !           251:            doreject("Invalid password");
        !           252:            sleep(10);          /* Don't let us do too many of these */
        !           253:            return 0;
        !           254:        }
        !           255:     }
        !           256:     if (api_exch_outcommand(EXCH_CMD_ASSOCIATED) == -1) {
        !           257:        return -1;
        !           258:     } else {
        !           259:        return 1;
        !           260:     }
        !           261: }
        !           262: 
        !           263: 
        !           264: void
        !           265: freestorage()
        !           266: {
        !           267:     struct storage_descriptor sd;
        !           268: 
        !           269:     if (storage_accessed) {
        !           270:        fprintf(stderr, "Internal error - attempt to free accessed storage.\n");
        !           271:        fprintf(stderr, "(Encountered in file %s at line %d.)\n",
        !           272:                        __FILE__, __LINE__);
        !           273:        quit();
        !           274:     }
        !           275:     if (storage_must_send == 0) {
        !           276:        return;
        !           277:     }
        !           278:     storage_must_send = 0;
        !           279:     if (api_exch_outcommand(EXCH_CMD_HEREIS) == -1) {
        !           280:        kill_connection();
        !           281:        return;
        !           282:     }
        !           283:     sd.length = storage_length;
        !           284:     sd.location = storage_location;
        !           285:     if (api_exch_outtype(EXCH_TYPE_STORE_DESC, sizeof sd, (char *)&sd) == -1) {
        !           286:        kill_connection();
        !           287:        return;
        !           288:     }
        !           289:     if (api_exch_outtype(EXCH_TYPE_BYTES, storage_length, (char *)storage)
        !           290:                                                            == -1) {
        !           291:        kill_connection();
        !           292:        return;
        !           293:     }
        !           294: }
        !           295: 
        !           296: 
        !           297: static int
        !           298: getstorage(address, length, copyin)
        !           299: long
        !           300:     address;
        !           301: int
        !           302:     length,
        !           303:     copyin;
        !           304: {
        !           305:     struct storage_descriptor sd;
        !           306: 
        !           307:     freestorage();
        !           308:     if (storage_accessed) {
        !           309:        fprintf(stderr,
        !           310:                "Internal error - attempt to get while storage accessed.\n");
        !           311:        fprintf(stderr, "(Encountered in file %s at line %d.)\n",
        !           312:                        __FILE__, __LINE__);
        !           313:        quit();
        !           314:     }
        !           315:     storage_must_send = 0;
        !           316:     if (api_exch_outcommand(EXCH_CMD_GIMME) == -1) {
        !           317:        kill_connection();
        !           318:        return -1;
        !           319:     }
        !           320:     storage_location = address;
        !           321:     storage_length = length;
        !           322:     if (copyin) {
        !           323:        sd.location = (long)storage_location;
        !           324:        sd.length = storage_length;
        !           325:        if (api_exch_outtype(EXCH_TYPE_STORE_DESC,
        !           326:                                        sizeof sd, (char *)&sd) == -1) {
        !           327:            kill_connection();
        !           328:            return -1;
        !           329:        }
        !           330:        if (api_exch_incommand(EXCH_CMD_HEREIS) == -1) {
        !           331:            fprintf(stderr, "Bad data from other side.\n");
        !           332:            fprintf(stderr, "(Encountered at %s, %d.)\n", __FILE__, __LINE__);
        !           333:            return -1;
        !           334:        }
        !           335:        if (nextstore() == -1) {
        !           336:            kill_connection();
        !           337:            return -1;
        !           338:        }
        !           339:     }
        !           340:     return 0;
        !           341: }
        !           342: 
        !           343: /*ARGSUSED*/
        !           344: void
        !           345: movetous(local, es, di, length)
        !           346: char
        !           347:     *local;
        !           348: unsigned int
        !           349:     es,
        !           350:     di;
        !           351: int
        !           352:     length;
        !           353: {
        !           354:     long where = SEG_OFF_BACK(es, di);
        !           355: 
        !           356:     if (length > sizeof storage) {
        !           357:        fprintf(stderr, "Internal API error - movetous() length too long.\n");
        !           358:        fprintf(stderr, "(detected in file %s, line %d)\n", __FILE__, __LINE__);
        !           359:        quit();
        !           360:     } else if (length == 0) {
        !           361:        return;
        !           362:     }
        !           363:     getstorage(where, length, 1);
        !           364:     memcpy(local, (char *)(storage+((where-storage_location))), length);
        !           365:     if (apitrace) {
        !           366:        Dump('(', local, length);
        !           367:     }
        !           368: }
        !           369: 
        !           370: /*ARGSUSED*/
        !           371: void
        !           372: movetothem(es, di, local, length)
        !           373: unsigned int
        !           374:     es,
        !           375:     di;
        !           376: char
        !           377:     *local;
        !           378: int
        !           379:     length;
        !           380: {
        !           381:     long where = SEG_OFF_BACK(es, di);
        !           382: 
        !           383:     if (length > sizeof storage) {
        !           384:        fprintf(stderr, "Internal API error - movetothem() length too long.\n");
        !           385:        fprintf(stderr, "(detected in file %s, line %d)\n", __FILE__, __LINE__);
        !           386:        quit();
        !           387:     } else if (length == 0) {
        !           388:        return;
        !           389:     }
        !           390:     freestorage();
        !           391:     memcpy((char *)storage, local, length);
        !           392:     if (apitrace) {
        !           393:        Dump(')', local, length);
        !           394:     }
        !           395:     storage_length = length;
        !           396:     storage_location = where;
        !           397:     storage_must_send = 1;
        !           398: }
        !           399: 
        !           400: 
        !           401: char *
        !           402: access_api(location, length, copyin)
        !           403: char *
        !           404:     location;
        !           405: int
        !           406:     length,
        !           407:     copyin;                    /* Do we need to copy in initially? */
        !           408: {
        !           409:     if (storage_accessed) {
        !           410:        fprintf(stderr, "Internal error - storage accessed twice\n");
        !           411:        fprintf(stderr, "(Encountered in file %s, line %d.)\n",
        !           412:                                __FILE__, __LINE__);
        !           413:        quit();
        !           414:     } else if (length != 0) {
        !           415:        freestorage();
        !           416:        getstorage((long)location, length, copyin);
        !           417:        storage_accessed = 1;
        !           418:     }
        !           419:     return (char *) storage;
        !           420: }
        !           421: 
        !           422: /*ARGSUSED*/
        !           423: void
        !           424: unaccess_api(location, local, length, copyout)
        !           425: char   *location;
        !           426: char   *local;
        !           427: int    length;
        !           428: int    copyout;
        !           429: {
        !           430:     if (storage_accessed == 0) {
        !           431:        fprintf(stderr, "Internal error - unnecessary unaccess_api call.\n");
        !           432:        fprintf(stderr, "(Encountered in file %s, line %d.)\n",
        !           433:                        __FILE__, __LINE__);
        !           434:        quit();
        !           435:     }
        !           436:     storage_accessed = 0;
        !           437:     storage_must_send = copyout;       /* if needs to go back */
        !           438: }
        !           439: 
        !           440: /*
        !           441:  * Accept a connection from an API client, aborting if the child dies.
        !           442:  */
        !           443: 
        !           444: static int
        !           445: doconnect()
        !           446: {
        !           447:     fd_set fdset;
        !           448:     int i;
        !           449: 
        !           450:     sock = -1;
        !           451:     FD_ZERO(&fdset);
        !           452:     while (shell_active && (sock == -1)) {
        !           453:        FD_SET(serversock, &fdset);
        !           454:        if ((i = select(serversock+1, &fdset,
        !           455:                    (fd_set *)0, (fd_set *)0, (struct timeval *)0)) < 0) {
        !           456:            if (errno = EINTR) {
        !           457:                continue;
        !           458:            } else {
        !           459:                perror("in select waiting for API connection");
        !           460:                return -1;
        !           461:            }
        !           462:        } else {
        !           463:            i = accept(serversock, (struct sockaddr *)0, (int *)0);
        !           464:            if (i == -1) {
        !           465:                perror("accepting API connection");
        !           466:                return -1;
        !           467:            }
        !           468:            sock = i;
        !           469:        }
        !           470:     }
        !           471:     /* If the process has already exited, we may need to close */
        !           472:     if ((shell_active == 0) && (sock != -1)) {
        !           473:        extern void setcommandmode();
        !           474: 
        !           475:        (void) close(sock);
        !           476:        sock = -1;
        !           477:        setcommandmode();       /* In case child_died sneaked in */
        !           478:     }
        !           479:     return 0;
        !           480: }
        !           481: 
        !           482: /*
        !           483:  * shell_continue() actually runs the command, and looks for API
        !           484:  * requests coming back in.
        !           485:  *
        !           486:  * We are called from the main loop in telnet.c.
        !           487:  */
        !           488: 
        !           489: int
        !           490: shell_continue()
        !           491: {
        !           492:     int i;
        !           493: 
        !           494:     switch (state) {
        !           495:     case DEAD:
        !           496:        pause();                        /* Nothing to do */
        !           497:        break;
        !           498:     case UNCONNECTED:
        !           499:        if (doconnect() == -1) {
        !           500:            kill_connection();
        !           501:            return -1;
        !           502:        }
        !           503:        /* At this point, it is possible that we've gone away */
        !           504:        if (shell_active == 0) {
        !           505:            kill_connection();
        !           506:            return -1;
        !           507:        }
        !           508:        if (api_exch_init(sock, "server") == -1) {
        !           509:            return -1;
        !           510:        }
        !           511:        while (state == UNCONNECTED) {
        !           512:            if (api_exch_incommand(EXCH_CMD_ASSOCIATE) == -1) {
        !           513:                kill_connection();
        !           514:                return -1;
        !           515:            } else {
        !           516:                switch (doassociate()) {
        !           517:                case -1:
        !           518:                    kill_connection();
        !           519:                    return -1;
        !           520:                case 0:
        !           521:                    break;
        !           522:                case 1:
        !           523:                    state = CONNECTED;
        !           524:                }
        !           525:            }
        !           526:        }
        !           527:        break;
        !           528:     case CONNECTED:
        !           529:        switch (i = api_exch_nextcommand()) {
        !           530:        case EXCH_CMD_REQUEST:
        !           531:            if (api_exch_intype(EXCH_TYPE_REGS, sizeof inputRegs,
        !           532:                                    (char *)&inputRegs) == -1) {
        !           533:                kill_connection();
        !           534:            } else if (api_exch_intype(EXCH_TYPE_SREGS, sizeof inputSregs,
        !           535:                                    (char *)&inputSregs) == -1) {
        !           536:                kill_connection();
        !           537:            } else if (nextstore() == -1) {
        !           538:                kill_connection();
        !           539:            } else {
        !           540:                handle_api(&inputRegs, &inputSregs);
        !           541:                freestorage();                  /* Send any storage back */
        !           542:                if (api_exch_outcommand(EXCH_CMD_REPLY) == -1) {
        !           543:                    kill_connection();
        !           544:                } else if (api_exch_outtype(EXCH_TYPE_REGS, sizeof inputRegs,
        !           545:                                    (char *)&inputRegs) == -1) {
        !           546:                    kill_connection();
        !           547:                } else if (api_exch_outtype(EXCH_TYPE_SREGS, sizeof inputSregs,
        !           548:                                    (char *)&inputSregs) == -1) {
        !           549:                    kill_connection();
        !           550:                }
        !           551:                /* Done, and it all worked! */
        !           552:            }
        !           553:            break;
        !           554:        case EXCH_CMD_DISASSOCIATE:
        !           555:            kill_connection();
        !           556:            break;
        !           557:        default:
        !           558:            if (i != -1) {
        !           559:                fprintf(stderr,
        !           560:                        "Looking for a REQUEST or DISASSOCIATE command\n");
        !           561:                fprintf(stderr, "\treceived 0x%02x.\n", i);
        !           562:            }
        !           563:            kill_connection();
        !           564:            break;
        !           565:        }
        !           566:     }
        !           567:     return shell_active;
        !           568: }
        !           569: 
        !           570: 
        !           571: static int
        !           572: child_died()
        !           573: {
        !           574:     union wait status;
        !           575:     register int pid;
        !           576: 
        !           577:     while ((pid = wait3(&status, WNOHANG, (struct rusage *)0)) > 0) {
        !           578:        if (pid == shell_pid) {
        !           579:            char inputbuffer[100];
        !           580:            extern void setconnmode();
        !           581:            extern void ConnectScreen();
        !           582: 
        !           583:            shell_active = 0;
        !           584:            if (sock != -1) {
        !           585:                (void) close(sock);
        !           586:                sock = -1;
        !           587:            }
        !           588:            printf("[Hit return to continue]");
        !           589:            fflush(stdout);
        !           590:            (void) gets(inputbuffer);
        !           591:            setconnmode();
        !           592:            ConnectScreen();    /* Turn screen on (if need be) */
        !           593:            (void) close(serversock);
        !           594:            (void) unlink(keyname);
        !           595:        }
        !           596:     }
        !           597:     signal(SIGCHLD, child_died);
        !           598: }
        !           599: 
        !           600: 
        !           601: /*
        !           602:  * Called from telnet.c to fork a lower command.com.  We
        !           603:  * use the spint... routines so that we can pick up
        !           604:  * interrupts generated by application programs.
        !           605:  */
        !           606: 
        !           607: 
        !           608: int
        !           609: shell(argc,argv)
        !           610: int    argc;
        !           611: char   *argv[];
        !           612: {
        !           613:     int length;
        !           614:     struct sockaddr_in server;
        !           615:     char sockNAME[100];
        !           616:     static char **whereAPI = 0;
        !           617:     int fd;
        !           618:     struct timeval tv;
        !           619:     long ikey;
        !           620:     extern long random();
        !           621:     extern char *mktemp();
        !           622:     extern char *strcpy();
        !           623: 
        !           624:     /* First, create verification file. */
        !           625:     do {
        !           626:        keyname = mktemp("/tmp/apiXXXXXX");
        !           627:        fd = open(keyname, O_RDWR|O_CREAT|O_EXCL, IREAD|IWRITE);
        !           628:     } while ((fd == -1) && (errno == EEXIST));
        !           629: 
        !           630:     if (fd == -1) {
        !           631:        perror("open");
        !           632:        return 0;
        !           633:     }
        !           634: 
        !           635:     /* Now, get seed for random */
        !           636: 
        !           637:     if (gettimeofday(&tv, (struct timezone *)0) == -1) {
        !           638:        perror("gettimeofday");
        !           639:        return 0;
        !           640:     }
        !           641:     srandom(tv.tv_usec);               /* seed random number generator */
        !           642:     do {
        !           643:        ikey = random();
        !           644:     } while (ikey == 0);
        !           645:     sprintf(key, "%lu\n", (unsigned long) ikey);
        !           646:     if (write(fd, key, strlen(key)) != strlen(key)) {
        !           647:        perror("write");
        !           648:        return 0;
        !           649:     }
        !           650:     key[strlen(key)-1] = 0;            /* Get rid of newline */
        !           651: 
        !           652:     if (close(fd) == -1) {
        !           653:        perror("close");
        !           654:        return 0;
        !           655:     }
        !           656: 
        !           657:     /* Next, create the socket which will be connected to */
        !           658:     serversock = socket(AF_INET, SOCK_STREAM, 0);
        !           659:     if (serversock < 0) {
        !           660:        perror("opening API socket");
        !           661:        return 0;
        !           662:     }
        !           663:     server.sin_family = AF_INET;
        !           664:     server.sin_addr.s_addr = INADDR_ANY;
        !           665:     server.sin_port = 0;
        !           666:     if (bind(serversock, (struct sockaddr *)&server, sizeof server) < 0) {
        !           667:        perror("binding API socket");
        !           668:        return 0;
        !           669:     }
        !           670:     length = sizeof server;
        !           671:     if (getsockname(serversock, (struct sockaddr *)&server, &length) < 0) {
        !           672:        perror("getting API socket name");
        !           673:        (void) close(serversock);
        !           674:     }
        !           675:     listen(serversock, 1);
        !           676:     /* Get name to advertise in address list */
        !           677:     strcpy(sockNAME, "API3270=");
        !           678:     gethostname(sockNAME+strlen(sockNAME), sizeof sockNAME-strlen(sockNAME));
        !           679:     if (strlen(sockNAME) > (sizeof sockNAME-(10+strlen(keyname)))) {
        !           680:        fprintf(stderr, "Local hostname too large; using 'localhost'.\n");
        !           681:        strcpy(sockNAME, "localhost");
        !           682:     }
        !           683:     sprintf(sockNAME+strlen(sockNAME), ":%u", ntohs(server.sin_port));
        !           684:     sprintf(sockNAME+strlen(sockNAME), ":%s", keyname);
        !           685: 
        !           686:     if (whereAPI == 0) {
        !           687:        char **ptr, **nextenv;
        !           688:        extern char **environ;
        !           689: 
        !           690:        ptr = environ;
        !           691:        nextenv = ourENVlist;
        !           692:        while (*ptr) {
        !           693:            if (nextenv >= &ourENVlist[highestof(ourENVlist)-1]) {
        !           694:                fprintf(stderr, "Too many environmental variables\n");
        !           695:                break;
        !           696:            }
        !           697:            *nextenv++ = *ptr++;
        !           698:        }
        !           699:        whereAPI = nextenv++;
        !           700:        *nextenv++ = 0;
        !           701:        environ = ourENVlist;           /* New environment */
        !           702:     }
        !           703:     *whereAPI = sockNAME;
        !           704: 
        !           705:     child_died();                      /* Start up signal handler */
        !           706:     shell_active = 1;                  /* We are running down below */
        !           707:     if (shell_pid = vfork()) {
        !           708:        if (shell_pid == -1) {
        !           709:            perror("vfork");
        !           710:            (void) close(serversock);
        !           711:        } else {
        !           712:            state = UNCONNECTED;
        !           713:        }
        !           714:     } else {                           /* New process */
        !           715:        register int i;
        !           716: 
        !           717:        for (i = 3; i < 30; i++) {
        !           718:            (void) close(i);
        !           719:        }
        !           720:        if (argc == 1) {                /* Just get a shell */
        !           721:            char *cmdname;
        !           722:            extern char *getenv();
        !           723: 
        !           724:            cmdname = getenv("SHELL");
        !           725:            execlp(cmdname, cmdname, 0);
        !           726:            perror("Exec'ing new shell...\n");
        !           727:            exit(1);
        !           728:        } else {
        !           729:            execvp(argv[1], &argv[1]);
        !           730:            perror("Exec'ing command.\n");
        !           731:            exit(1);
        !           732:        }
        !           733:        /*NOTREACHED*/
        !           734:     }
        !           735:     return shell_active;               /* Go back to main loop */
        !           736: }

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