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Annotation of 43BSDTahoe/usr.lib/sendmail/src/recipient.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[] = "@(#)recipient.c        5.12 (Berkeley) 6/30/88";
        !            21: #endif /* not lint */
        !            22: 
        !            23: # include <pwd.h>
        !            24: # include "sendmail.h"
        !            25: # include <sys/stat.h>
        !            26: 
        !            27: /*
        !            28: **  SENDTOLIST -- Designate a send list.
        !            29: **
        !            30: **     The parameter is a comma-separated list of people to send to.
        !            31: **     This routine arranges to send to all of them.
        !            32: **
        !            33: **     Parameters:
        !            34: **             list -- the send list.
        !            35: **             ctladdr -- the address template for the person to
        !            36: **                     send to -- effective uid/gid are important.
        !            37: **                     This is typically the alias that caused this
        !            38: **                     expansion.
        !            39: **             sendq -- a pointer to the head of a queue to put
        !            40: **                     these people into.
        !            41: **
        !            42: **     Returns:
        !            43: **             none
        !            44: **
        !            45: **     Side Effects:
        !            46: **             none.
        !            47: */
        !            48: 
        !            49: # define MAXRCRSN      10
        !            50: 
        !            51: sendtolist(list, ctladdr, sendq)
        !            52:        char *list;
        !            53:        ADDRESS *ctladdr;
        !            54:        ADDRESS **sendq;
        !            55: {
        !            56:        register char *p;
        !            57:        register ADDRESS *al;   /* list of addresses to send to */
        !            58:        bool firstone;          /* set on first address sent */
        !            59:        bool selfref;           /* set if this list includes ctladdr */
        !            60:        char delimiter;         /* the address delimiter */
        !            61: 
        !            62: # ifdef DEBUG
        !            63:        if (tTd(25, 1))
        !            64:        {
        !            65:                printf("sendto: %s\n   ctladdr=", list);
        !            66:                printaddr(ctladdr, FALSE);
        !            67:        }
        !            68: # endif DEBUG
        !            69: 
        !            70:        /* heuristic to determine old versus new style addresses */
        !            71:        if (ctladdr == NULL &&
        !            72:            (index(list, ',') != NULL || index(list, ';') != NULL ||
        !            73:             index(list, '<') != NULL || index(list, '(') != NULL))
        !            74:                CurEnv->e_flags &= ~EF_OLDSTYLE;
        !            75:        delimiter = ' ';
        !            76:        if (!bitset(EF_OLDSTYLE, CurEnv->e_flags) || ctladdr != NULL)
        !            77:                delimiter = ',';
        !            78: 
        !            79:        firstone = TRUE;
        !            80:        selfref = FALSE;
        !            81:        al = NULL;
        !            82: 
        !            83:        for (p = list; *p != '\0'; )
        !            84:        {
        !            85:                register ADDRESS *a;
        !            86:                extern char *DelimChar;         /* defined in prescan */
        !            87: 
        !            88:                /* parse the address */
        !            89:                while (isspace(*p) || *p == ',')
        !            90:                        p++;
        !            91:                a = parseaddr(p, (ADDRESS *) NULL, 1, delimiter);
        !            92:                p = DelimChar;
        !            93:                if (a == NULL)
        !            94:                        continue;
        !            95:                a->q_next = al;
        !            96:                a->q_alias = ctladdr;
        !            97: 
        !            98:                /* see if this should be marked as a primary address */
        !            99:                if (ctladdr == NULL ||
        !           100:                    (firstone && *p == '\0' && bitset(QPRIMARY, ctladdr->q_flags)))
        !           101:                        a->q_flags |= QPRIMARY;
        !           102: 
        !           103:                /* put on send queue or suppress self-reference */
        !           104:                if (ctladdr != NULL && sameaddr(ctladdr, a))
        !           105:                        selfref = TRUE;
        !           106:                else
        !           107:                        al = a;
        !           108:                firstone = FALSE;
        !           109:        }
        !           110: 
        !           111:        /* if this alias doesn't include itself, delete ctladdr */
        !           112:        if (!selfref && ctladdr != NULL)
        !           113:                ctladdr->q_flags |= QDONTSEND;
        !           114: 
        !           115:        /* arrange to send to everyone on the local send list */
        !           116:        while (al != NULL)
        !           117:        {
        !           118:                register ADDRESS *a = al;
        !           119:                extern ADDRESS *recipient();
        !           120: 
        !           121:                al = a->q_next;
        !           122:                a = recipient(a, sendq);
        !           123: 
        !           124:                /* arrange to inherit full name */
        !           125:                if (a->q_fullname == NULL && ctladdr != NULL)
        !           126:                        a->q_fullname = ctladdr->q_fullname;
        !           127:        }
        !           128: 
        !           129:        CurEnv->e_to = NULL;
        !           130: }
        !           131: /*
        !           132: **  RECIPIENT -- Designate a message recipient
        !           133: **
        !           134: **     Saves the named person for future mailing.
        !           135: **
        !           136: **     Parameters:
        !           137: **             a -- the (preparsed) address header for the recipient.
        !           138: **             sendq -- a pointer to the head of a queue to put the
        !           139: **                     recipient in.  Duplicate supression is done
        !           140: **                     in this queue.
        !           141: **
        !           142: **     Returns:
        !           143: **             The actual address in the queue.  This will be "a" if
        !           144: **             the address is not a duplicate, else the original address.
        !           145: **
        !           146: **     Side Effects:
        !           147: **             none.
        !           148: */
        !           149: 
        !           150: ADDRESS *
        !           151: recipient(a, sendq)
        !           152:        register ADDRESS *a;
        !           153:        register ADDRESS **sendq;
        !           154: {
        !           155:        register ADDRESS *q;
        !           156:        ADDRESS **pq;
        !           157:        register struct mailer *m;
        !           158:        register char *p;
        !           159:        bool quoted = FALSE;            /* set if the addr has a quote bit */
        !           160:        char buf[MAXNAME];              /* unquoted image of the user name */
        !           161:        extern ADDRESS *getctladdr();
        !           162:        extern bool safefile();
        !           163: 
        !           164:        CurEnv->e_to = a->q_paddr;
        !           165:        m = a->q_mailer;
        !           166:        errno = 0;
        !           167: # ifdef DEBUG
        !           168:        if (tTd(26, 1))
        !           169:        {
        !           170:                printf("\nrecipient: ");
        !           171:                printaddr(a, FALSE);
        !           172:        }
        !           173: # endif DEBUG
        !           174: 
        !           175:        /* break aliasing loops */
        !           176:        if (AliasLevel > MAXRCRSN)
        !           177:        {
        !           178:                usrerr("aliasing/forwarding loop broken");
        !           179:                return (a);
        !           180:        }
        !           181: 
        !           182:        /*
        !           183:        **  Finish setting up address structure.
        !           184:        */
        !           185: 
        !           186:        /* set the queue timeout */
        !           187:        a->q_timeout = TimeOut;
        !           188: 
        !           189:        /* map user & host to lower case if requested on non-aliases */
        !           190:        if (a->q_alias == NULL)
        !           191:                loweraddr(a);
        !           192: 
        !           193:        /* get unquoted user for file, program or user.name check */
        !           194:        (void) strcpy(buf, a->q_user);
        !           195:        for (p = buf; *p != '\0' && !quoted; p++)
        !           196:        {
        !           197:                if (!isascii(*p) && (*p & 0377) != (SpaceSub & 0377))
        !           198:                        quoted = TRUE;
        !           199:        }
        !           200:        stripquotes(buf, TRUE);
        !           201: 
        !           202:        /* do sickly crude mapping for program mailing, etc. */
        !           203:        if (m == LocalMailer && buf[0] == '|')
        !           204:        {
        !           205:                a->q_mailer = m = ProgMailer;
        !           206:                a->q_user++;
        !           207:                if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail)
        !           208:                {
        !           209:                        a->q_flags |= QDONTSEND|QBADADDR;
        !           210:                        usrerr("Cannot mail directly to programs");
        !           211:                }
        !           212:        }
        !           213: 
        !           214:        /*
        !           215:        **  Look up this person in the recipient list.
        !           216:        **      If they are there already, return, otherwise continue.
        !           217:        **      If the list is empty, just add it.  Notice the cute
        !           218:        **      hack to make from addresses suppress things correctly:
        !           219:        **      the QDONTSEND bit will be set in the send list.
        !           220:        **      [Please note: the emphasis is on "hack."]
        !           221:        */
        !           222: 
        !           223:        for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next)
        !           224:        {
        !           225:                if (!ForceMail && sameaddr(q, a))
        !           226:                {
        !           227: # ifdef DEBUG
        !           228:                        if (tTd(26, 1))
        !           229:                        {
        !           230:                                printf("%s in sendq: ", a->q_paddr);
        !           231:                                printaddr(q, FALSE);
        !           232:                        }
        !           233: # endif DEBUG
        !           234:                        if (!bitset(QDONTSEND, a->q_flags))
        !           235:                                message(Arpa_Info, "duplicate suppressed");
        !           236:                        if (!bitset(QPRIMARY, q->q_flags))
        !           237:                                q->q_flags |= a->q_flags;
        !           238:                        return (q);
        !           239:                }
        !           240:        }
        !           241: 
        !           242:        /* add address on list */
        !           243:        *pq = a;
        !           244:        a->q_next = NULL;
        !           245:        CurEnv->e_nrcpts++;
        !           246: 
        !           247:        /*
        !           248:        **  Alias the name and handle :include: specs.
        !           249:        */
        !           250: 
        !           251:        if (m == LocalMailer && !bitset(QDONTSEND, a->q_flags))
        !           252:        {
        !           253:                if (strncmp(a->q_user, ":include:", 9) == 0)
        !           254:                {
        !           255:                        a->q_flags |= QDONTSEND;
        !           256:                        if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail)
        !           257:                        {
        !           258:                                a->q_flags |= QBADADDR;
        !           259:                                usrerr("Cannot mail directly to :include:s");
        !           260:                        }
        !           261:                        else
        !           262:                        {
        !           263:                                message(Arpa_Info, "including file %s", &a->q_user[9]);
        !           264:                                include(&a->q_user[9], " sending", a, sendq);
        !           265:                        }
        !           266:                }
        !           267:                else
        !           268:                        alias(a, sendq);
        !           269:        }
        !           270: 
        !           271:        /*
        !           272:        **  If the user is local and still being sent, verify that
        !           273:        **  the address is good.  If it is, try to forward.
        !           274:        **  If the address is already good, we have a forwarding
        !           275:        **  loop.  This can be broken by just sending directly to
        !           276:        **  the user (which is probably correct anyway).
        !           277:        */
        !           278: 
        !           279:        if (!bitset(QDONTSEND, a->q_flags) && m == LocalMailer)
        !           280:        {
        !           281:                struct stat stb;
        !           282:                extern bool writable();
        !           283: 
        !           284:                /* see if this is to a file */
        !           285:                if (buf[0] == '/')
        !           286:                {
        !           287:                        p = rindex(buf, '/');
        !           288:                        /* check if writable or creatable */
        !           289:                        if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail)
        !           290:                        {
        !           291:                                a->q_flags |= QDONTSEND|QBADADDR;
        !           292:                                usrerr("Cannot mail directly to files");
        !           293:                        }
        !           294:                        else if ((stat(buf, &stb) >= 0) ? (!writable(&stb)) :
        !           295:                            (*p = '\0', !safefile(buf, getruid(), S_IWRITE|S_IEXEC)))
        !           296:                        {
        !           297:                                a->q_flags |= QBADADDR;
        !           298:                                giveresponse(EX_CANTCREAT, m, CurEnv);
        !           299:                        }
        !           300:                }
        !           301:                else
        !           302:                {
        !           303:                        register struct passwd *pw;
        !           304:                        extern struct passwd *finduser();
        !           305: 
        !           306:                        /* warning -- finduser may trash buf */
        !           307:                        pw = finduser(buf);
        !           308:                        if (pw == NULL)
        !           309:                        {
        !           310:                                a->q_flags |= QBADADDR;
        !           311:                                giveresponse(EX_NOUSER, m, CurEnv);
        !           312:                        }
        !           313:                        else
        !           314:                        {
        !           315:                                char nbuf[MAXNAME];
        !           316: 
        !           317:                                if (strcmp(a->q_user, pw->pw_name) != 0)
        !           318:                                {
        !           319:                                        a->q_user = newstr(pw->pw_name);
        !           320:                                        (void) strcpy(buf, pw->pw_name);
        !           321:                                }
        !           322:                                a->q_home = newstr(pw->pw_dir);
        !           323:                                a->q_uid = pw->pw_uid;
        !           324:                                a->q_gid = pw->pw_gid;
        !           325:                                a->q_flags |= QGOODUID;
        !           326:                                buildfname(pw->pw_gecos, pw->pw_name, nbuf);
        !           327:                                if (nbuf[0] != '\0')
        !           328:                                        a->q_fullname = newstr(nbuf);
        !           329:                                if (!quoted)
        !           330:                                        forward(a, sendq);
        !           331:                        }
        !           332:                }
        !           333:        }
        !           334:        return (a);
        !           335: }
        !           336: /*
        !           337: **  FINDUSER -- find the password entry for a user.
        !           338: **
        !           339: **     This looks a lot like getpwnam, except that it may want to
        !           340: **     do some fancier pattern matching in /etc/passwd.
        !           341: **
        !           342: **     This routine contains most of the time of many sendmail runs.
        !           343: **     It deserves to be optimized.
        !           344: **
        !           345: **     Parameters:
        !           346: **             name -- the name to match against.
        !           347: **
        !           348: **     Returns:
        !           349: **             A pointer to a pw struct.
        !           350: **             NULL if name is unknown or ambiguous.
        !           351: **
        !           352: **     Side Effects:
        !           353: **             may modify name.
        !           354: */
        !           355: 
        !           356: struct passwd *
        !           357: finduser(name)
        !           358:        char *name;
        !           359: {
        !           360:        register struct passwd *pw;
        !           361:        register char *p;
        !           362:        extern struct passwd *getpwent();
        !           363:        extern struct passwd *getpwnam();
        !           364: 
        !           365:        /* map upper => lower case */
        !           366:        for (p = name; *p != '\0'; p++)
        !           367:        {
        !           368:                if (isascii(*p) && isupper(*p))
        !           369:                        *p = tolower(*p);
        !           370:        }
        !           371: 
        !           372:        /* look up this login name using fast path */
        !           373:        if ((pw = getpwnam(name)) != NULL)
        !           374:                return (pw);
        !           375: 
        !           376:        /* search for a matching full name instead */
        !           377:        for (p = name; *p != '\0'; p++)
        !           378:        {
        !           379:                if (*p == (SpaceSub & 0177) || *p == '_')
        !           380:                        *p = ' ';
        !           381:        }
        !           382:        (void) setpwent();
        !           383:        while ((pw = getpwent()) != NULL)
        !           384:        {
        !           385:                char buf[MAXNAME];
        !           386: 
        !           387:                buildfname(pw->pw_gecos, pw->pw_name, buf);
        !           388:                if (index(buf, ' ') != NULL && !strcasecmp(buf, name))
        !           389:                {
        !           390:                        message(Arpa_Info, "sending to login name %s", pw->pw_name);
        !           391:                        return (pw);
        !           392:                }
        !           393:        }
        !           394:        return (NULL);
        !           395: }
        !           396: /*
        !           397: **  WRITABLE -- predicate returning if the file is writable.
        !           398: **
        !           399: **     This routine must duplicate the algorithm in sys/fio.c.
        !           400: **     Unfortunately, we cannot use the access call since we
        !           401: **     won't necessarily be the real uid when we try to
        !           402: **     actually open the file.
        !           403: **
        !           404: **     Notice that ANY file with ANY execute bit is automatically
        !           405: **     not writable.  This is also enforced by mailfile.
        !           406: **
        !           407: **     Parameters:
        !           408: **             s -- pointer to a stat struct for the file.
        !           409: **
        !           410: **     Returns:
        !           411: **             TRUE -- if we will be able to write this file.
        !           412: **             FALSE -- if we cannot write this file.
        !           413: **
        !           414: **     Side Effects:
        !           415: **             none.
        !           416: */
        !           417: 
        !           418: bool
        !           419: writable(s)
        !           420:        register struct stat *s;
        !           421: {
        !           422:        int euid, egid;
        !           423:        int bits;
        !           424: 
        !           425:        if (bitset(0111, s->st_mode))
        !           426:                return (FALSE);
        !           427:        euid = getruid();
        !           428:        egid = getrgid();
        !           429:        if (geteuid() == 0)
        !           430:        {
        !           431:                if (bitset(S_ISUID, s->st_mode))
        !           432:                        euid = s->st_uid;
        !           433:                if (bitset(S_ISGID, s->st_mode))
        !           434:                        egid = s->st_gid;
        !           435:        }
        !           436: 
        !           437:        if (euid == 0)
        !           438:                return (TRUE);
        !           439:        bits = S_IWRITE;
        !           440:        if (euid != s->st_uid)
        !           441:        {
        !           442:                bits >>= 3;
        !           443:                if (egid != s->st_gid)
        !           444:                        bits >>= 3;
        !           445:        }
        !           446:        return ((s->st_mode & bits) != 0);
        !           447: }
        !           448: /*
        !           449: **  INCLUDE -- handle :include: specification.
        !           450: **
        !           451: **     Parameters:
        !           452: **             fname -- filename to include.
        !           453: **             msg -- message to print in verbose mode.
        !           454: **             ctladdr -- address template to use to fill in these
        !           455: **                     addresses -- effective user/group id are
        !           456: **                     the important things.
        !           457: **             sendq -- a pointer to the head of the send queue
        !           458: **                     to put these addresses in.
        !           459: **
        !           460: **     Returns:
        !           461: **             none.
        !           462: **
        !           463: **     Side Effects:
        !           464: **             reads the :include: file and sends to everyone
        !           465: **             listed in that file.
        !           466: */
        !           467: 
        !           468: include(fname, msg, ctladdr, sendq)
        !           469:        char *fname;
        !           470:        char *msg;
        !           471:        ADDRESS *ctladdr;
        !           472:        ADDRESS **sendq;
        !           473: {
        !           474:        char buf[MAXLINE];
        !           475:        register FILE *fp;
        !           476:        char *oldto = CurEnv->e_to;
        !           477:        char *oldfilename = FileName;
        !           478:        int oldlinenumber = LineNumber;
        !           479: 
        !           480:        fp = fopen(fname, "r");
        !           481:        if (fp == NULL)
        !           482:        {
        !           483:                usrerr("Cannot open %s", fname);
        !           484:                return;
        !           485:        }
        !           486:        if (getctladdr(ctladdr) == NULL)
        !           487:        {
        !           488:                struct stat st;
        !           489: 
        !           490:                if (fstat(fileno(fp), &st) < 0)
        !           491:                        syserr("Cannot fstat %s!", fname);
        !           492:                ctladdr->q_uid = st.st_uid;
        !           493:                ctladdr->q_gid = st.st_gid;
        !           494:                ctladdr->q_flags |= QGOODUID;
        !           495:        }
        !           496: 
        !           497:        /* read the file -- each line is a comma-separated list. */
        !           498:        FileName = fname;
        !           499:        LineNumber = 0;
        !           500:        while (fgets(buf, sizeof buf, fp) != NULL)
        !           501:        {
        !           502:                register char *p = index(buf, '\n');
        !           503: 
        !           504:                if (p != NULL)
        !           505:                        *p = '\0';
        !           506:                if (buf[0] == '\0')
        !           507:                        continue;
        !           508:                CurEnv->e_to = oldto;
        !           509:                message(Arpa_Info, "%s to %s", msg, buf);
        !           510:                AliasLevel++;
        !           511:                sendtolist(buf, ctladdr, sendq);
        !           512:                AliasLevel--;
        !           513:        }
        !           514: 
        !           515:        (void) fclose(fp);
        !           516:        FileName = oldfilename;
        !           517:        LineNumber = oldlinenumber;
        !           518: }
        !           519: /*
        !           520: **  SENDTOARGV -- send to an argument vector.
        !           521: **
        !           522: **     Parameters:
        !           523: **             argv -- argument vector to send to.
        !           524: **
        !           525: **     Returns:
        !           526: **             none.
        !           527: **
        !           528: **     Side Effects:
        !           529: **             puts all addresses on the argument vector onto the
        !           530: **                     send queue.
        !           531: */
        !           532: 
        !           533: sendtoargv(argv)
        !           534:        register char **argv;
        !           535: {
        !           536:        register char *p;
        !           537: 
        !           538:        while ((p = *argv++) != NULL)
        !           539:        {
        !           540:                if (argv[0] != NULL && argv[1] != NULL && !strcasecmp(argv[0], "at"))
        !           541:                {
        !           542:                        char nbuf[MAXNAME];
        !           543: 
        !           544:                        if (strlen(p) + strlen(argv[1]) + 2 > sizeof nbuf)
        !           545:                                usrerr("address overflow");
        !           546:                        else
        !           547:                        {
        !           548:                                (void) strcpy(nbuf, p);
        !           549:                                (void) strcat(nbuf, "@");
        !           550:                                (void) strcat(nbuf, argv[1]);
        !           551:                                p = newstr(nbuf);
        !           552:                                argv += 2;
        !           553:                        }
        !           554:                }
        !           555:                sendtolist(p, (ADDRESS *) NULL, &CurEnv->e_sendqueue);
        !           556:        }
        !           557: }
        !           558: /*
        !           559: **  GETCTLADDR -- get controlling address from an address header.
        !           560: **
        !           561: **     If none, get one corresponding to the effective userid.
        !           562: **
        !           563: **     Parameters:
        !           564: **             a -- the address to find the controller of.
        !           565: **
        !           566: **     Returns:
        !           567: **             the controlling address.
        !           568: **
        !           569: **     Side Effects:
        !           570: **             none.
        !           571: */
        !           572: 
        !           573: ADDRESS *
        !           574: getctladdr(a)
        !           575:        register ADDRESS *a;
        !           576: {
        !           577:        while (a != NULL && !bitset(QGOODUID, a->q_flags))
        !           578:                a = a->q_alias;
        !           579:        return (a);
        !           580: }

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