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Annotation of 43BSDTahoe/new/news/src/recnews.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * recnews [to newsgroup] [from user] [approved by]
        !             3:  *
        !             4:  * Process a news article which has been mailed to some group like msgs.
        !             5:  * Such articles are in normal mail format and have never seen the insides
        !             6:  * of netnews.  If the "to newsgroup" is included, the article is posted
        !             7:  * to this newsgroup instead of trying to intuit it from the headers.
        !             8:  * If the "from user" is included, the return address is forged to look
        !             9:  * like that user instead of what getuid or a from line says.
        !            10:  *
        !            11:  * It is recommended that you always include the to newsgroup, since the
        !            12:  * intuition code is flakey and out of date.  The from user is probably
        !            13:  * appropriate for arpanet mailing lists being funnelled at ucbvax but
        !            14:  * not otherwise.  Sample lines in /usr/lib/aliases (if you run delivermail):
        !            15:  *     worldnews: "|/usr/lib/news/recnews net.general"
        !            16:  *             Allows you to mail to worldnews rather than using inews.
        !            17:  *             Intended for humans to mail to.
        !            18:  *     post-unix-wizards: "|/usr/lib/news/recnews fa.unix-wizards unix-wizards"
        !            19:  *             Causes mail to post-unix-wizards to be fed into fa.unix-wizards
        !            20:  *             and the return address forged as unix-wizards on the local
        !            21:  *             machine.  post-unix-wizards (on the local machine) should
        !            22:  *             be part of the master mailing list somewhere (on a different
        !            23:  *             machine.)
        !            24:  *     in-gamemasters: "|/usr/lib/news/recnews mail.gamemasters '' news"
        !            25:  *
        !            26:  * Recnews is primarily useful in remote places on the usenet which collect
        !            27:  * mail from mailing lists and funnel them into the network.  It is also
        !            28:  * useful if you like to send mail to some user instead of invoking
        !            29:  * inews -t .. -n .. when you want to submit an article.  (Many mailers give
        !            30:  * you nice facilities like editing the message.)  It is not, however,
        !            31:  * essential to use recnews to be able to join usenet.
        !            32:  *
        !            33:  * WARNING: recnews disables the "recording" check - it has to because
        !            34:  * by the time inews is run, it's in the background and too late to
        !            35:  * ask permission.  If you depend heavily on recordings you probably
        !            36:  * should not allow recnews (and thus the mail interface) to be used.
        !            37:  *
        !            38:  * 1) We leave the from line alone.  Just escape the double quotes, but let the
        !            39:  *    mailer do the rest.
        !            40:  * 2) We give precedence to "From:" over "From " or ">From " in determining
        !            41:  *    who the article is really from.
        !            42:  *    Modifications by rad@tek
        !            43:  *
        !            44:  * [email protected]: add third argument to cause inews to be invoked with -a,
        !            45:  *              for use with local groups for mailing lists with 2.11.
        !            46:  */
        !            47: 
        !            48: #ifdef SCCSID
        !            49: static char    *SccsId = "@(#)recnews.c        2.14    10/15/87";
        !            50: #endif /* SCCSID */
        !            51: 
        !            52: #include "params.h"
        !            53: 
        !            54: /*
        !            55:  * Note: we assume there are 2 kinds of hosts using recnews:
        !            56:  * Those that have delivermail (and hence this program will never
        !            57:  * have to deal with more than one message at a time) and those on the arpanet
        !            58:  * that do not (and hence all messages end with a sentinel).  It is
        !            59:  * supposed that regular v7 type systems without delivermail or some
        !            60:  * other automatic forwarding device will just use rnews.  We do
        !            61:  * not attempt to tell where a message ends on all systems due to the
        !            62:  * different conventions in effect.  (This COULD be fixed, I suppose.)
        !            63:  */
        !            64: 
        !            65: /*
        !            66:  * Kinds of lines in a message.
        !            67:  */
        !            68: #define FROM   001             /* From line */
        !            69: #define SUBJ   002             /* Subject */
        !            70: #define TO     003             /* To (newgroup based on this) */
        !            71: #define BLANK  004             /* blank line */
        !            72: #define EOM    005             /* End of message (4 ctrl A's) */
        !            73: #define HEADER 006             /* any unrecognized header */
        !            74: #define TEXT   007             /* anything unrecognized */
        !            75: #define INCLUSIVE 010          /* newsgroup is already in header */
        !            76: 
        !            77: /*
        !            78:  * Possible states program can be in.
        !            79:  */
        !            80: #define SKIPPING       0100    /* In header of message */
        !            81: #define READING                0200    /* In body of message */
        !            82: 
        !            83: #define BFSZ 250
        !            84: 
        !            85: #define EOT    '\004'
        !            86: 
        !            87: char   from[BFSZ];             /* mailing address for replies */
        !            88: char   sender[BFSZ];           /* mailing address of author, if different */
        !            89: char   to[BFSZ];               /* Destination of mail (msgs, etc) */
        !            90: char   subject[BFSZ];          /* subject of message */
        !            91: char   newsgroup[BFSZ];        /* newsgroups of message */
        !            92: char   approved[BFSZ];         /* Approved: */
        !            93: int    fromset;                /* from passed on command line */
        !            94: char   cmdbuf[BFSZ];           /* command to popen */
        !            95: 
        !            96: extern char    *strcat(), *strcpy(), *index();
        !            97: extern FILE    *popen();
        !            98: char   *any();
        !            99: 
        !           100: main(argc, argv)
        !           101: int argc;
        !           102: char **argv;
        !           103: {
        !           104:        char buf[BFSZ], inews[BFSZ];
        !           105:        register char *p, *q;
        !           106:        register FILE *pipe = NULL;
        !           107:        register int state;
        !           108: 
        !           109:        /* build inews command */
        !           110: #ifdef LOGDIR
        !           111:        sprintf(inews, "%s/%s/%s", logdir(HOME), LIBDIR, "inews");
        !           112: #else
        !           113:        sprintf(inews, "%s/%s", LIBDIR, "inews");
        !           114: #endif
        !           115: 
        !           116:        if (argc > 1)
        !           117:                strcpy(to, argv[1]);
        !           118:        if (argc > 2)
        !           119:                strcpy(from, argv[2]);
        !           120:        if (argc > 3 && *argv[3]) {
        !           121:                sprintf(approved,"-a %s", argv[3]);
        !           122:        }
        !           123: 
        !           124:        /*
        !           125:         * Flag that we know who message is from to avoid trying to 
        !           126:         * decipher the From line.
        !           127:         */
        !           128:        if (argc > 2 && (argv[2][0] != '\0'))
        !           129:                fromset++;
        !           130: 
        !           131: #ifdef debug
        !           132:        printf("argv[0] is <%s>, argv[1] is <%s>, argv[2] is <%s>\n",
        !           133:                argv[0], argv[1], argv[2]);
        !           134: #endif
        !           135:        state = SKIPPING;
        !           136:        while (fgets(buf, BFSZ, stdin) != NULL) {
        !           137:                if (state == READING) {
        !           138:                        fputs(buf,pipe);
        !           139:                        continue;
        !           140:                }
        !           141:                switch (type(buf)) {
        !           142: 
        !           143:                case FROM:
        !           144:                        frombreak(buf, from);
        !           145:                        break;
        !           146: 
        !           147:                case SUBJ:
        !           148:                        p = any(buf, " \t");
        !           149:                        if (p == NULL)
        !           150:                                p = buf + 8;
        !           151:                        q = subject;
        !           152:                        while (*++p) {
        !           153:                                if (*p == '"')
        !           154:                                        *q++ = '\\';
        !           155:                                *q++ = *p;
        !           156:                        }
        !           157:                        q[-1] = '\0';
        !           158:                        break;
        !           159: 
        !           160:                case TO:
        !           161:                        if (to[0])
        !           162:                                break;          /* already have one */
        !           163:                        p = any(buf, " \t");
        !           164:                        if (p == NULL)
        !           165:                                p = buf + 3;
        !           166:                        q = to;
        !           167:                        while (*++p) {
        !           168:                                if (*p == '"')
        !           169:                                        *q++ = '\\';
        !           170:                                *q++ = *p;
        !           171:                        }
        !           172:                        q[-1] = '\0';
        !           173:                        break;
        !           174: 
        !           175:                case INCLUSIVE:
        !           176:                        sprintf(cmdbuf,"exec %s -p", inews);
        !           177:                        pipe = popen(cmdbuf,"w");
        !           178:                        if (pipe == NULL){
        !           179:                                perror("recnews: open failed");
        !           180:                                exit(1);
        !           181:                        }
        !           182:                        state = READING;
        !           183:                        fputs(buf,pipe);
        !           184:                        break;
        !           185:                        
        !           186:                /*
        !           187:                 * Kludge to compensate for messages without real headers
        !           188:                 */
        !           189:                case HEADER:
        !           190:                        break;
        !           191: 
        !           192:                case BLANK:
        !           193:                        state = READING;
        !           194:                        strcpy(newsgroup, to);
        !           195:                        sprintf(cmdbuf,
        !           196:                                "exec %s -t \"%s\" -n \"%s\" -f \"%s\" %s",
        !           197:                                inews, *subject ? subject : "(none)",
        !           198:                                newsgroup, from, *approved ? approved : 0);
        !           199: #ifdef debug
        !           200:                        pipe = stdout;
        !           201:                        printf("BLANK: %s\n", cmdbuf);
        !           202: #else
        !           203:                        pipe = popen(cmdbuf, "w");
        !           204:                        if (pipe == NULL) {
        !           205:                                perror("recnews: popen failed");
        !           206:                                exit(1);
        !           207:                        }
        !           208: #endif
        !           209:                        if (sender[0]) {
        !           210:                                fputs(sender, pipe);
        !           211:                                putc('\n', pipe);
        !           212:                        }
        !           213:                        break;
        !           214: 
        !           215:                case TEXT:
        !           216:                        strcpy(newsgroup, to);
        !           217:                        state = READING;
        !           218:                        if (subject[0] == 0) {
        !           219:                                strcpy(subject, buf);
        !           220:                                if (subject[strlen(subject)-1] == '\n')
        !           221:                                        subject[strlen(subject)-1] = '\0';
        !           222:                        }
        !           223:                        sprintf(cmdbuf,
        !           224:                                "exec \"%s\" -t \"%s\" -n \"%s\" -f \"%s\" %s",
        !           225:                                inews, subject, newsgroup, from,
        !           226:                                *approved ? approved : 0);
        !           227: #ifdef debug
        !           228:                        pipe = stdout;
        !           229:                        printf("TEXT: %s\n", cmdbuf);
        !           230: #else
        !           231:                        pipe = popen(cmdbuf, "w");
        !           232:                        if (pipe == NULL) {
        !           233:                                perror("pipe failed");
        !           234:                                exit(1);
        !           235:                        }
        !           236: #endif
        !           237:                        if (sender[0]){
        !           238:                                fputs(sender, pipe);
        !           239:                                putc('\n',pipe);
        !           240:                        }
        !           241:                        break;
        !           242:                }
        !           243:        }
        !           244:        exit(0);
        !           245: }
        !           246: 
        !           247: type(p)
        !           248: register char *p;
        !           249: {
        !           250:        char *firstbl;
        !           251:        static char lasthdr = 1;                /* prev line was a header */
        !           252: 
        !           253:        if ((*p == ' ' || *p == '\t') && lasthdr)
        !           254:                return HEADER;          /* continuation line */
        !           255:        firstbl = any(p, " \t");
        !           256:        while (*p == ' ' || *p == '?' || *p == '\t')
        !           257:                ++p;
        !           258: 
        !           259:        if (*p == '\n' || *p == 0)
        !           260:                return BLANK;
        !           261:        if (STRNCMP(p, ">From", 5) == 0 || STRNCMP(p, "From", 4) == 0)
        !           262:                return FROM;
        !           263:        if (STRNCMP(p, "Subj", 4)==0 || STRNCMP(p, "Re:", 3)==0 ||
        !           264:                STRNCMP(p, "re:", 3)==0)
        !           265:                return SUBJ;
        !           266:        if (STRNCMP(p, "To", 2)==0)
        !           267:                return TO;
        !           268:        if (STRNCMP(p, "\1\1\1\1", 4)==0)
        !           269:                return EOM;
        !           270:        if (firstbl && firstbl[-1] == ':' && isalpha(*p))
        !           271:                return HEADER;
        !           272:        lasthdr = 0;
        !           273:        return TEXT;
        !           274: }
        !           275: 
        !           276: /*
        !           277:  * Figure out who a message is from.
        !           278:  */
        !           279: frombreak(buf, fbuf)
        !           280: register char *buf, *fbuf;
        !           281: {
        !           282:        register char *p, *q;
        !           283:        if (fbuf[0] && fromset) {       /* we already know who it's from */
        !           284:                if (sender[0] == 0 || buf[4] == ':') {
        !           285: #ifdef debug
        !           286:                        printf("sender set to: %s", buf);
        !           287: #endif
        !           288:                        strcpy(sender, buf);
        !           289:                }
        !           290:                return;
        !           291:        }
        !           292:        /*
        !           293:         * Leave fancy Froms alone - this parsing is done by mail
        !           294:         * Just quote the double quotes to prevent interpetation 
        !           295:         * by the shell.
        !           296:         * rad@tek
        !           297:         */
        !           298:        p = any(buf, " \t");
        !           299:        if (p==NULL)
        !           300:                p = buf + 4;
        !           301:        q = fbuf;
        !           302:        while (*++p) {
        !           303:                if (*p == '"')
        !           304:                        *q++ = '\\';
        !           305:                *q++ = *p;
        !           306:        }
        !           307:        q[-1] = '\0';
        !           308:        if ((p=index(fbuf,'\n')) != NULL)
        !           309:                *p = '\0';
        !           310:        if (buf[4] == ':')
        !           311:                fromset++;
        !           312: }
        !           313: 
        !           314: /*
        !           315:  * Return the ptr in sp at which a character in sq appears;
        !           316:  * NULL if not found
        !           317:  *
        !           318:  */
        !           319: char *
        !           320: any(sp, sq)
        !           321: char *sp, *sq;
        !           322: {
        !           323:        register c1, c2;
        !           324:        register char *q;
        !           325: 
        !           326:        while (c1 = *sp++) {
        !           327:                q = sq;
        !           328:                while (c2 = *q++)
        !           329:                        if (c1 == c2)
        !           330:                                return(--sp);
        !           331:        }
        !           332:        return(NULL);
        !           333: }

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