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Annotation of 43BSDTahoe/usr.lib/sendmail/src/envelope.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Eric P. Allman
        !             3:  * Copyright (c) 1988 Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Redistribution and use in source and binary forms are permitted
        !             7:  * provided that the above copyright notice and this paragraph are
        !             8:  * duplicated in all such forms and that any documentation,
        !             9:  * advertising materials, and other materials related to such
        !            10:  * distribution and use acknowledge that the software was developed
        !            11:  * by the University of California, Berkeley.  The name of the
        !            12:  * University may not be used to endorse or promote products derived
        !            13:  * from this software without specific prior written permission.
        !            14:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            15:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            16:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17:  */
        !            18: 
        !            19: #ifndef lint
        !            20: static char sccsid[] = "@(#)envelope.c 5.15 (Berkeley) 6/30/88";
        !            21: #endif /* not lint */
        !            22: 
        !            23: #include <pwd.h>
        !            24: #include <sys/time.h>
        !            25: #include "sendmail.h"
        !            26: #include <sys/stat.h>
        !            27: 
        !            28: /*
        !            29: **  NEWENVELOPE -- allocate a new envelope
        !            30: **
        !            31: **     Supports inheritance.
        !            32: **
        !            33: **     Parameters:
        !            34: **             e -- the new envelope to fill in.
        !            35: **
        !            36: **     Returns:
        !            37: **             e.
        !            38: **
        !            39: **     Side Effects:
        !            40: **             none.
        !            41: */
        !            42: 
        !            43: ENVELOPE *
        !            44: newenvelope(e)
        !            45:        register ENVELOPE *e;
        !            46: {
        !            47:        register ENVELOPE *parent;
        !            48:        extern putheader(), putbody();
        !            49:        extern ENVELOPE BlankEnvelope;
        !            50: 
        !            51:        parent = CurEnv;
        !            52:        if (e == CurEnv)
        !            53:                parent = e->e_parent;
        !            54:        clearenvelope(e, TRUE);
        !            55:        if (e == CurEnv)
        !            56:                bcopy((char *) &NullAddress, (char *) &e->e_from, sizeof e->e_from);
        !            57:        else
        !            58:                bcopy((char *) &CurEnv->e_from, (char *) &e->e_from, sizeof e->e_from);
        !            59:        e->e_parent = parent;
        !            60:        e->e_ctime = curtime();
        !            61:        e->e_msgpriority = parent->e_msgsize;
        !            62:        e->e_puthdr = putheader;
        !            63:        e->e_putbody = putbody;
        !            64:        if (CurEnv->e_xfp != NULL)
        !            65:                (void) fflush(CurEnv->e_xfp);
        !            66: 
        !            67:        return (e);
        !            68: }
        !            69: /*
        !            70: **  DROPENVELOPE -- deallocate an envelope.
        !            71: **
        !            72: **     Parameters:
        !            73: **             e -- the envelope to deallocate.
        !            74: **
        !            75: **     Returns:
        !            76: **             none.
        !            77: **
        !            78: **     Side Effects:
        !            79: **             housekeeping necessary to dispose of an envelope.
        !            80: **             Unlocks this queue file.
        !            81: */
        !            82: 
        !            83: dropenvelope(e)
        !            84:        register ENVELOPE *e;
        !            85: {
        !            86:        bool queueit = FALSE;
        !            87:        register ADDRESS *q;
        !            88: 
        !            89: #ifdef DEBUG
        !            90:        if (tTd(50, 1))
        !            91:        {
        !            92:                printf("dropenvelope %x id=", e);
        !            93:                xputs(e->e_id);
        !            94:                printf(" flags=%o\n", e->e_flags);
        !            95:        }
        !            96: #endif DEBUG
        !            97: #ifdef LOG
        !            98:        if (LogLevel > 10)
        !            99:                syslog(LOG_DEBUG, "dropenvelope, id=%s, flags=%o, pid=%d",
        !           100:                                  e->e_id == NULL ? "(none)" : e->e_id,
        !           101:                                  e->e_flags, getpid());
        !           102: #endif LOG
        !           103: 
        !           104:        /* we must have an id to remove disk files */
        !           105:        if (e->e_id == NULL)
        !           106:                return;
        !           107: 
        !           108:        /*
        !           109:        **  Extract state information from dregs of send list.
        !           110:        */
        !           111: 
        !           112:        for (q = e->e_sendqueue; q != NULL; q = q->q_next)
        !           113:        {
        !           114:                if (bitset(QQUEUEUP, q->q_flags))
        !           115:                        queueit = TRUE;
        !           116:        }
        !           117: 
        !           118:        /*
        !           119:        **  Send back return receipts as requested.
        !           120:        */
        !           121: 
        !           122:        if (e->e_receiptto != NULL && bitset(EF_SENDRECEIPT, e->e_flags))
        !           123:        {
        !           124:                auto ADDRESS *rlist = NULL;
        !           125: 
        !           126:                sendtolist(CurEnv->e_receiptto, (ADDRESS *) NULL, &rlist);
        !           127:                (void) returntosender("Return receipt", rlist, FALSE);
        !           128:        }
        !           129: 
        !           130:        /*
        !           131:        **  Arrange to send error messages if there are fatal errors.
        !           132:        */
        !           133: 
        !           134:        if (bitset(EF_FATALERRS|EF_TIMEOUT, e->e_flags) && ErrorMode != EM_QUIET)
        !           135:                savemail(e);
        !           136: 
        !           137:        /*
        !           138:        **  Instantiate or deinstantiate the queue.
        !           139:        */
        !           140: 
        !           141:        if ((!queueit && !bitset(EF_KEEPQUEUE, e->e_flags)) ||
        !           142:            bitset(EF_CLRQUEUE, e->e_flags))
        !           143:        {
        !           144:                if (e->e_df != NULL)
        !           145:                        xunlink(e->e_df);
        !           146:                xunlink(queuename(e, 'q'));
        !           147:        }
        !           148:        else if (queueit || !bitset(EF_INQUEUE, e->e_flags))
        !           149:        {
        !           150: #ifdef QUEUE
        !           151:                queueup(e, FALSE, FALSE);
        !           152: #else QUEUE
        !           153:                syserr("dropenvelope: queueup");
        !           154: #endif QUEUE
        !           155:        }
        !           156: 
        !           157:        /* now unlock the job */
        !           158:        closexscript(e);
        !           159:        unlockqueue(e);
        !           160: 
        !           161:        /* make sure that this envelope is marked unused */
        !           162:        e->e_id = e->e_df = NULL;
        !           163:        if (e->e_dfp != NULL)
        !           164:                (void) fclose(e->e_dfp);
        !           165:        e->e_dfp = NULL;
        !           166: }
        !           167: /*
        !           168: **  CLEARENVELOPE -- clear an envelope without unlocking
        !           169: **
        !           170: **     This is normally used by a child process to get a clean
        !           171: **     envelope without disturbing the parent.
        !           172: **
        !           173: **     Parameters:
        !           174: **             e -- the envelope to clear.
        !           175: **             fullclear - if set, the current envelope is total
        !           176: **                     garbage and should be ignored; otherwise,
        !           177: **                     release any resources it may indicate.
        !           178: **
        !           179: **     Returns:
        !           180: **             none.
        !           181: **
        !           182: **     Side Effects:
        !           183: **             Closes files associated with the envelope.
        !           184: **             Marks the envelope as unallocated.
        !           185: */
        !           186: 
        !           187: clearenvelope(e, fullclear)
        !           188:        register ENVELOPE *e;
        !           189:        bool fullclear;
        !           190: {
        !           191:        register HDR *bh;
        !           192:        register HDR **nhp;
        !           193:        extern ENVELOPE BlankEnvelope;
        !           194: 
        !           195:        if (!fullclear)
        !           196:        {
        !           197:                /* clear out any file information */
        !           198:                if (e->e_xfp != NULL)
        !           199:                        (void) fclose(e->e_xfp);
        !           200:                if (e->e_dfp != NULL)
        !           201:                        (void) fclose(e->e_dfp);
        !           202:        }
        !           203: 
        !           204:        /* now clear out the data */
        !           205:        STRUCTCOPY(BlankEnvelope, *e);
        !           206:        bh = BlankEnvelope.e_header;
        !           207:        nhp = &e->e_header;
        !           208:        while (bh != NULL)
        !           209:        {
        !           210:                *nhp = (HDR *) xalloc(sizeof *bh);
        !           211:                bcopy((char *) bh, (char *) *nhp, sizeof *bh);
        !           212:                bh = bh->h_link;
        !           213:                nhp = &(*nhp)->h_link;
        !           214:        }
        !           215: }
        !           216: /*
        !           217: **  INITSYS -- initialize instantiation of system
        !           218: **
        !           219: **     In Daemon mode, this is done in the child.
        !           220: **
        !           221: **     Parameters:
        !           222: **             none.
        !           223: **
        !           224: **     Returns:
        !           225: **             none.
        !           226: **
        !           227: **     Side Effects:
        !           228: **             Initializes the system macros, some global variables,
        !           229: **             etc.  In particular, the current time in various
        !           230: **             forms is set.
        !           231: */
        !           232: 
        !           233: initsys()
        !           234: {
        !           235:        static char cbuf[5];                    /* holds hop count */
        !           236:        static char pbuf[10];                   /* holds pid */
        !           237: #ifdef TTYNAME
        !           238:        static char ybuf[10];                   /* holds tty id */
        !           239:        register char *p;
        !           240: #endif TTYNAME
        !           241:        extern char *ttyname();
        !           242:        extern char *macvalue();
        !           243:        extern char Version[];
        !           244: 
        !           245:        /*
        !           246:        **  Give this envelope a reality.
        !           247:        **      I.e., an id, a transcript, and a creation time.
        !           248:        */
        !           249: 
        !           250:        openxscript(CurEnv);
        !           251:        CurEnv->e_ctime = curtime();
        !           252: 
        !           253:        /*
        !           254:        **  Set OutChannel to something useful if stdout isn't it.
        !           255:        **      This arranges that any extra stuff the mailer produces
        !           256:        **      gets sent back to the user on error (because it is
        !           257:        **      tucked away in the transcript).
        !           258:        */
        !           259: 
        !           260:        if (OpMode == MD_DAEMON && QueueRun)
        !           261:                OutChannel = CurEnv->e_xfp;
        !           262: 
        !           263:        /*
        !           264:        **  Set up some basic system macros.
        !           265:        */
        !           266: 
        !           267:        /* process id */
        !           268:        (void) sprintf(pbuf, "%d", getpid());
        !           269:        define('p', pbuf, CurEnv);
        !           270: 
        !           271:        /* hop count */
        !           272:        (void) sprintf(cbuf, "%d", CurEnv->e_hopcount);
        !           273:        define('c', cbuf, CurEnv);
        !           274: 
        !           275:        /* time as integer, unix time, arpa time */
        !           276:        settime();
        !           277: 
        !           278: #ifdef TTYNAME
        !           279:        /* tty name */
        !           280:        if (macvalue('y', CurEnv) == NULL)
        !           281:        {
        !           282:                p = ttyname(2);
        !           283:                if (p != NULL)
        !           284:                {
        !           285:                        if (rindex(p, '/') != NULL)
        !           286:                                p = rindex(p, '/') + 1;
        !           287:                        (void) strcpy(ybuf, p);
        !           288:                        define('y', ybuf, CurEnv);
        !           289:                }
        !           290:        }
        !           291: #endif TTYNAME
        !           292: }
        !           293: /*
        !           294: **  SETTIME -- set the current time.
        !           295: **
        !           296: **     Parameters:
        !           297: **             none.
        !           298: **
        !           299: **     Returns:
        !           300: **             none.
        !           301: **
        !           302: **     Side Effects:
        !           303: **             Sets the various time macros -- $a, $b, $d, $t.
        !           304: */
        !           305: 
        !           306: settime()
        !           307: {
        !           308:        register char *p;
        !           309:        auto time_t now;
        !           310:        static char tbuf[20];                   /* holds "current" time */
        !           311:        static char dbuf[30];                   /* holds ctime(tbuf) */
        !           312:        register struct tm *tm;
        !           313:        extern char *arpadate();
        !           314:        extern struct tm *gmtime();
        !           315:        extern char *macvalue();
        !           316: 
        !           317:        now = curtime();
        !           318:        tm = gmtime(&now);
        !           319:        (void) sprintf(tbuf, "%02d%02d%02d%02d%02d", tm->tm_year, tm->tm_mon+1,
        !           320:                        tm->tm_mday, tm->tm_hour, tm->tm_min);
        !           321:        define('t', tbuf, CurEnv);
        !           322:        (void) strcpy(dbuf, ctime(&now));
        !           323:        *index(dbuf, '\n') = '\0';
        !           324:        if (macvalue('d', CurEnv) == NULL)
        !           325:                define('d', dbuf, CurEnv);
        !           326:        p = newstr(arpadate(dbuf));
        !           327:        if (macvalue('a', CurEnv) == NULL)
        !           328:                define('a', p, CurEnv);
        !           329:        define('b', p, CurEnv);
        !           330: }
        !           331: /*
        !           332: **  OPENXSCRIPT -- Open transcript file
        !           333: **
        !           334: **     Creates a transcript file for possible eventual mailing or
        !           335: **     sending back.
        !           336: **
        !           337: **     Parameters:
        !           338: **             e -- the envelope to create the transcript in/for.
        !           339: **
        !           340: **     Returns:
        !           341: **             none
        !           342: **
        !           343: **     Side Effects:
        !           344: **             Creates the transcript file.
        !           345: */
        !           346: 
        !           347: openxscript(e)
        !           348:        register ENVELOPE *e;
        !           349: {
        !           350:        register char *p;
        !           351: 
        !           352: # ifdef LOG
        !           353:        if (LogLevel > 19)
        !           354:                syslog(LOG_DEBUG, "%s: openx%s", e->e_id, e->e_xfp == NULL ? "" : " (no)");
        !           355: # endif LOG
        !           356:        if (e->e_xfp != NULL)
        !           357:                return;
        !           358:        p = queuename(e, 'x');
        !           359:        e->e_xfp = fopen(p, "w");
        !           360:        if (e->e_xfp == NULL)
        !           361:                syserr("Can't create %s", p);
        !           362:        else
        !           363:                (void) chmod(p, 0644);
        !           364: }
        !           365: /*
        !           366: **  CLOSEXSCRIPT -- close the transcript file.
        !           367: **
        !           368: **     Parameters:
        !           369: **             e -- the envelope containing the transcript to close.
        !           370: **
        !           371: **     Returns:
        !           372: **             none.
        !           373: **
        !           374: **     Side Effects:
        !           375: **             none.
        !           376: */
        !           377: 
        !           378: closexscript(e)
        !           379:        register ENVELOPE *e;
        !           380: {
        !           381:        if (e->e_xfp == NULL)
        !           382:                return;
        !           383:        (void) fclose(e->e_xfp);
        !           384:        e->e_xfp = NULL;
        !           385: }
        !           386: /*
        !           387: **  SETSENDER -- set the person who this message is from
        !           388: **
        !           389: **     Under certain circumstances allow the user to say who
        !           390: **     s/he is (using -f or -r).  These are:
        !           391: **     1.  The user's uid is zero (root).
        !           392: **     2.  The user's login name is in an approved list (typically
        !           393: **         from a network server).
        !           394: **     3.  The address the user is trying to claim has a
        !           395: **         "!" character in it (since #2 doesn't do it for
        !           396: **         us if we are dialing out for UUCP).
        !           397: **     A better check to replace #3 would be if the
        !           398: **     effective uid is "UUCP" -- this would require me
        !           399: **     to rewrite getpwent to "grab" uucp as it went by,
        !           400: **     make getname more nasty, do another passwd file
        !           401: **     scan, or compile the UID of "UUCP" into the code,
        !           402: **     all of which are reprehensible.
        !           403: **
        !           404: **     Assuming all of these fail, we figure out something
        !           405: **     ourselves.
        !           406: **
        !           407: **     Parameters:
        !           408: **             from -- the person we would like to believe this message
        !           409: **                     is from, as specified on the command line.
        !           410: **
        !           411: **     Returns:
        !           412: **             none.
        !           413: **
        !           414: **     Side Effects:
        !           415: **             sets sendmail's notion of who the from person is.
        !           416: */
        !           417: 
        !           418: setsender(from)
        !           419:        char *from;
        !           420: {
        !           421:        register char **pvp;
        !           422:        char *realname = NULL;
        !           423:        register struct passwd *pw;
        !           424:        char buf[MAXNAME];
        !           425:        char pvpbuf[PSBUFSIZE];
        !           426:        extern struct passwd *getpwnam();
        !           427:        extern char *macvalue();
        !           428:        extern char **prescan();
        !           429:        extern bool safefile();
        !           430:        extern char *FullName;
        !           431: 
        !           432: # ifdef DEBUG
        !           433:        if (tTd(45, 1))
        !           434:                printf("setsender(%s)\n", from == NULL ? "" : from);
        !           435: # endif DEBUG
        !           436: 
        !           437:        /*
        !           438:        **  Figure out the real user executing us.
        !           439:        **      Username can return errno != 0 on non-errors.
        !           440:        */
        !           441: 
        !           442:        if (QueueRun || OpMode == MD_SMTP || OpMode == MD_ARPAFTP)
        !           443:                realname = from;
        !           444:        if (realname == NULL || realname[0] == '\0')
        !           445:        {
        !           446:                extern char *username();
        !           447: 
        !           448:                realname = username();
        !           449:        }
        !           450: 
        !           451:        /*
        !           452:        **  Determine if this real person is allowed to alias themselves.
        !           453:        */
        !           454: 
        !           455:        if (from != NULL)
        !           456:        {
        !           457:                extern bool trusteduser();
        !           458: 
        !           459:                if (!trusteduser(realname) &&
        !           460: # ifdef DEBUG
        !           461:                    (!tTd(1, 9) || getuid() != geteuid()) &&
        !           462: # endif DEBUG
        !           463:                    index(from, '!') == NULL && getuid() != 0)
        !           464:                {
        !           465:                        /* network sends -r regardless (why why why?) */
        !           466:                        /* syserr("%s, you cannot use the -f flag", realname); */
        !           467:                        from = NULL;
        !           468:                }
        !           469:        }
        !           470: 
        !           471:        SuprErrs = TRUE;
        !           472:        if (from == NULL || parseaddr(from, &CurEnv->e_from, 1, '\0') == NULL)
        !           473:        {
        !           474:                /* log garbage addresses for traceback */
        !           475:                if (from != NULL)
        !           476:                {
        !           477: # ifdef LOG
        !           478:                        if (LogLevel >= 1)
        !           479:                                syslog(LOG_ERR, "Unparseable user %s wants to be %s",
        !           480:                                                realname, from);
        !           481: # endif LOG
        !           482:                }
        !           483:                from = newstr(realname);
        !           484:                if (parseaddr(from, &CurEnv->e_from, 1, '\0') == NULL &&
        !           485:                    parseaddr("postmaster", &CurEnv->e_from, 1, '\0') == NULL)
        !           486:                {
        !           487:                        syserr("setsender: can't even parse postmaster!");
        !           488:                }
        !           489:        }
        !           490:        else
        !           491:                FromFlag = TRUE;
        !           492:        CurEnv->e_from.q_flags |= QDONTSEND;
        !           493:        loweraddr(&CurEnv->e_from);
        !           494:        SuprErrs = FALSE;
        !           495: 
        !           496:        if (CurEnv->e_from.q_mailer == LocalMailer &&
        !           497:            (pw = getpwnam(CurEnv->e_from.q_user)) != NULL)
        !           498:        {
        !           499:                /*
        !           500:                **  Process passwd file entry.
        !           501:                */
        !           502: 
        !           503: 
        !           504:                /* extract home directory */
        !           505:                CurEnv->e_from.q_home = newstr(pw->pw_dir);
        !           506:                define('z', CurEnv->e_from.q_home, CurEnv);
        !           507: 
        !           508:                /* extract user and group id */
        !           509:                CurEnv->e_from.q_uid = pw->pw_uid;
        !           510:                CurEnv->e_from.q_gid = pw->pw_gid;
        !           511: 
        !           512:                /* if the user has given fullname already, don't redefine */
        !           513:                if (FullName == NULL)
        !           514:                        FullName = macvalue('x', CurEnv);
        !           515:                if (FullName != NULL && FullName[0] == '\0')
        !           516:                        FullName = NULL;
        !           517: 
        !           518:                /* extract full name from passwd file */
        !           519:                if (FullName == NULL && pw->pw_gecos != NULL &&
        !           520:                    strcmp(pw->pw_name, CurEnv->e_from.q_user) == 0)
        !           521:                {
        !           522:                        buildfname(pw->pw_gecos, CurEnv->e_from.q_user, buf);
        !           523:                        if (buf[0] != '\0')
        !           524:                                FullName = newstr(buf);
        !           525:                }
        !           526:                if (FullName != NULL)
        !           527:                        define('x', FullName, CurEnv);
        !           528:        }
        !           529:        else
        !           530:        {
        !           531:                if (CurEnv->e_from.q_home == NULL)
        !           532:                        CurEnv->e_from.q_home = getenv("HOME");
        !           533:                CurEnv->e_from.q_uid = getuid();
        !           534:                CurEnv->e_from.q_gid = getgid();
        !           535:        }
        !           536: 
        !           537:        if (CurEnv->e_from.q_uid != 0)
        !           538:        {
        !           539:                DefUid = CurEnv->e_from.q_uid;
        !           540:                DefGid = CurEnv->e_from.q_gid;
        !           541:        }
        !           542: 
        !           543:        /*
        !           544:        **  Rewrite the from person to dispose of possible implicit
        !           545:        **      links in the net.
        !           546:        */
        !           547: 
        !           548:        pvp = prescan(from, '\0', pvpbuf);
        !           549:        if (pvp == NULL)
        !           550:        {
        !           551:                syserr("cannot prescan from (%s)", from);
        !           552:                finis();
        !           553:        }
        !           554:        rewrite(pvp, 3);
        !           555:        rewrite(pvp, 1);
        !           556:        rewrite(pvp, 4);
        !           557:        cataddr(pvp, buf, sizeof buf);
        !           558:        define('f', newstr(buf), CurEnv);
        !           559: 
        !           560:        /* save the domain spec if this mailer wants it */
        !           561:        if (CurEnv->e_from.q_mailer != NULL &&
        !           562:            bitnset(M_CANONICAL, CurEnv->e_from.q_mailer->m_flags))
        !           563:        {
        !           564:                extern char **copyplist();
        !           565: 
        !           566:                while (*pvp != NULL && strcmp(*pvp, "@") != 0)
        !           567:                        pvp++;
        !           568:                if (*pvp != NULL)
        !           569:                        CurEnv->e_fromdomain = copyplist(pvp, TRUE);
        !           570:        }
        !           571: }
        !           572: /*
        !           573: **  TRUSTEDUSER -- tell us if this user is to be trusted.
        !           574: **
        !           575: **     Parameters:
        !           576: **             user -- the user to be checked.
        !           577: **
        !           578: **     Returns:
        !           579: **             TRUE if the user is in an approved list.
        !           580: **             FALSE otherwise.
        !           581: **
        !           582: **     Side Effects:
        !           583: **             none.
        !           584: */
        !           585: 
        !           586: bool
        !           587: trusteduser(user)
        !           588:        char *user;
        !           589: {
        !           590:        register char **ulist;
        !           591:        extern char *TrustedUsers[];
        !           592: 
        !           593:        for (ulist = TrustedUsers; *ulist != NULL; ulist++)
        !           594:                if (strcmp(*ulist, user) == 0)
        !           595:                        return (TRUE);
        !           596:        return (FALSE);
        !           597: }

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