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Annotation of researchv10no/cmd/netnews/src/recnews.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * recnews [to newsgroup] [from user]
        !             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        !            12:  * intution code is flakey and out of date.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:  *
        !            25:  * Recnews is primarily useful in remote places on the usenet which collect
        !            26:  * mail from mailing lists and funnel them into the network.  It is also
        !            27:  * useful if you like to send mail to some user instead of invoking
        !            28:  * inews -t .. -n .. when you want to submit an article.  (Many mailers give
        !            29:  * you nice facilities like editing the message.)  It is not, however,
        !            30:  * essential to use recnews to be able to join usenet.
        !            31:  *
        !            32:  * WARNING: recnews disables the "recording" check - it has to because
        !            33:  * by the time inews is run, it's in the background and too late to
        !            34:  * ask permission.  If you depend heavily on recordings you probably
        !            35:  * should now allow recnews (and thus the mail interface) to be used.
        !            36:  */
        !            37: 
        !            38: static char *SccsId = "@(#)recnews.c   2.4     3/3/83";
        !            39: 
        !            40: #include "defs.h"
        !            41: 
        !            42: #include <stdio.h>
        !            43: #include <ctype.h>
        !            44: 
        !            45: /*
        !            46:  * Note: we assume there are 2 kinds of hosts using recnews:
        !            47:  * Those that have delivermail (and hence this program will never
        !            48:  * have to deal with more than one message at a time) and those on the arpanet
        !            49:  * that do not (and hence all messages end with a sentenel).  It is
        !            50:  * supposed that regular v7 type systems without delivermail or some
        !            51:  * other automatic forwarding device will just use rnews.  We do
        !            52:  * not attempt to tell where a message ends on all systems due to the
        !            53:  * different conventions in effect.  (This COULD be fixed, I suppose.)
        !            54:  */
        !            55: 
        !            56: /*
        !            57:  * Kinds of lines in a message.
        !            58:  */
        !            59: #define FROM   001             /* From line */
        !            60: #define SUBJ   002             /* Subject */
        !            61: #define TO     003             /* To (newgroup based on this) */
        !            62: #define BLANK  004             /* blank line */
        !            63: #define EOM    005             /* End of message (4 ctrl A's) */
        !            64: #define HEADER 006             /* any unrecognized header */
        !            65: #define TEXT   007             /* anything unrecognized */
        !            66: 
        !            67: /*
        !            68:  * Possible states program can be in.
        !            69:  */
        !            70: #define SKIPPING       0100    /* In header of message */
        !            71: #define READING                0200    /* In body of message */
        !            72: 
        !            73: #define BFSZ 250
        !            74: 
        !            75: #define EOT    '\004'
        !            76: 
        !            77: char   from[BFSZ];             /* mailing address for replies */
        !            78: char   sender[BFSZ];           /* mailing address of author, if different */
        !            79: char   to[BFSZ];               /* Destination of mail (msgs, etc) */
        !            80: char   subject[BFSZ];          /* subject of message */
        !            81: char   newsgroup[BFSZ];        /* newsgroups of message */
        !            82: char   cmdbuf[BFSZ];           /* command to popen */
        !            83: 
        !            84: extern char    *strcat(), *strcpy();
        !            85: extern FILE    *popen();
        !            86: char   *any();
        !            87: 
        !            88: main(argc, argv)
        !            89: int argc;
        !            90: char **argv;
        !            91: {
        !            92:        char buf[BFSZ];
        !            93:        register char *p;
        !            94:        register FILE *pipe;
        !            95:        register int state, pathcnt;
        !            96:        int t;
        !            97: 
        !            98:        if (argc > 1)
        !            99:                strcpy(to, argv[1]);
        !           100:        if (argc > 2)
        !           101:                strcpy(from, argv[2]);
        !           102: #ifdef debug
        !           103:        printf("argv[0] is <%s>, argv[1] is <%s>, argv[2] is <%s>\n",
        !           104:                argv[0], argv[1], argv[2]);
        !           105: #endif
        !           106:        state = SKIPPING;
        !           107:        while (fgets(buf, BFSZ, stdin) != NULL) {
        !           108:                t = type(buf) | state;
        !           109: #ifdef debug
        !           110:                printf("%o\t%s", t, buf);
        !           111: #endif
        !           112:                switch (t) {
        !           113: 
        !           114:                case FROM | SKIPPING:
        !           115:                        frombreak(buf, from);
        !           116:                        break;
        !           117: 
        !           118:                case FROM | READING:
        !           119:                        fputs(buf, pipe);
        !           120:                        break;
        !           121: 
        !           122:                case SUBJ | SKIPPING:
        !           123:                        p = any(buf, " \t");
        !           124:                        if (p == NULL)
        !           125:                                p = buf+8;
        !           126:                        strcpy(subject, p+1);
        !           127:                        subject[strlen(subject)-1] = 0; /* trim trailing \n */
        !           128:                        break;
        !           129: 
        !           130:                case SUBJ | READING:
        !           131:                        fputs(buf, pipe);
        !           132:                        break;
        !           133: 
        !           134:                case TO | SKIPPING:
        !           135:                        if (to[0])
        !           136:                                break;          /* already have one */
        !           137:                        p = any(buf, " \t");
        !           138:                        if (p == NULL)
        !           139:                                p = buf;
        !           140:                        strcpy(to, p+1);        /* strip leading blank */
        !           141:                        to[strlen(to)-1] = 0;   /* strip trailing \n */
        !           142:                        break;
        !           143:                        
        !           144:                case TO | READING:
        !           145:                        fputs(buf, pipe);
        !           146:                        break;
        !           147: 
        !           148:                /*
        !           149:                 * Kludge to compensate for messages without real headers
        !           150:                 */
        !           151:                case HEADER | SKIPPING:
        !           152:                        break;
        !           153: 
        !           154:                case HEADER | READING:
        !           155:                        fputs(buf, pipe);
        !           156:                        break;
        !           157: 
        !           158:                case BLANK | SKIPPING:
        !           159:                        state = READING;
        !           160:                        findgroup(to, newsgroup);
        !           161:                        sprintf(cmdbuf, "%s -D -t \"%s\" -n %s -f %s", INEWS, subject, newsgroup, from);
        !           162: #ifdef debug
        !           163:                        pipe = stdout;
        !           164:                        printf("BLANK: %s\n", cmdbuf);
        !           165: #else
        !           166:                        pipe = popen(cmdbuf, "w");
        !           167:                        if (pipe == NULL) {
        !           168:                                perror("recnews: popen failed");
        !           169:                                exit(1);
        !           170:                        }
        !           171: #endif
        !           172:                        if (sender[0])
        !           173:                                fputs(sender, pipe);
        !           174:                        break;
        !           175: 
        !           176:                case BLANK | READING:
        !           177:                        fputs(buf, pipe);
        !           178:                        break;
        !           179: 
        !           180:                case TEXT | SKIPPING:
        !           181:                        findgroup(to, newsgroup);
        !           182:                        state = READING;
        !           183:                        if (subject[0] == 0) {
        !           184:                                strcpy(subject, buf);
        !           185:                                if (subject[strlen(subject)-1] == '\n')
        !           186:                                        subject[strlen(subject)-1] = '\0';
        !           187:                        }
        !           188:                        sprintf(cmdbuf, "%s -D -t \"%s\" -n %s -f %s", INEWS, subject, newsgroup, from);
        !           189: #ifdef debug
        !           190:                        pipe = stdout;
        !           191:                        printf("TEXT: %s\n", cmdbuf);
        !           192: #else
        !           193:                        pipe = popen(cmdbuf, "w");
        !           194:                        if (pipe == NULL) {
        !           195:                                fprintf(stderr, "pipe failed\n");
        !           196:                                exit(1);
        !           197:                        }
        !           198: #endif
        !           199:                        if (sender[0])
        !           200:                                fputs(sender, pipe);
        !           201:                        break;
        !           202: 
        !           203:                case TEXT | READING:
        !           204:                        fputs(buf, pipe);
        !           205:                        break;
        !           206:                }
        !           207:        }
        !           208:        exit(0);
        !           209: }
        !           210: 
        !           211: #define itsa(kind) {lastcomma=thiscomma; lasthdr=(kind!=TEXT); return kind;}
        !           212: type(p)
        !           213: register char *p;
        !           214: {
        !           215:        char *firstbl;
        !           216:        static char lasthdr=0;          /* prev line was a header */
        !           217:        static char lastcomma=0;        /* prev line ended in a comma */
        !           218:        int thiscomma;
        !           219: 
        !           220:        thiscomma = (p[strlen(p)-2] == ',');
        !           221:        if (*p == ' ' && lasthdr && lastcomma)
        !           222:                itsa(HEADER);           /* continuation line */
        !           223:        firstbl = any(p, " \t");
        !           224:        while (*p == ' ' || *p == '?' || *p == '\t')
        !           225:                ++p;
        !           226: 
        !           227:        if (*p == '\n' || *p == 0)
        !           228:                itsa(BLANK);
        !           229:        if (strncmp(p, ">From", 5) == 0 ||
        !           230:            strncmp(p, "From", 4) == 0)
        !           231:                itsa (FROM);
        !           232:        if (strncmp(p, "Subj", 4)==0 ||
        !           233:            strncmp(p, "Re:", 3)==0 ||
        !           234:            strncmp(p, "re:", 3)==0)
        !           235:                itsa (SUBJ);
        !           236:        if (strncmp(p, "To", 2)==0)
        !           237:                itsa(TO);
        !           238:        if (strncmp(p, "\1\1\1\1", 4)==0)
        !           239:                itsa(EOM);
        !           240:        if (firstbl && firstbl[-1] == ':' && isalpha(*p))
        !           241:                itsa(HEADER);
        !           242:        itsa(TEXT);
        !           243: }
        !           244: 
        !           245: /*
        !           246:  * Figure out who a message is from.
        !           247:  */
        !           248: frombreak(buf, fbuf)
        !           249: register char *buf, *fbuf;
        !           250: {
        !           251:        register char *p;
        !           252:        char wordfrom[BFSZ], uname[BFSZ], at[BFSZ], site[BFSZ];
        !           253: 
        !           254:        if (fbuf[0]) {  /* we already know who it's from */
        !           255:                if (sender[0] == 0) {
        !           256: #ifdef debug
        !           257:                        printf("sender set to: %s", buf);
        !           258: #endif
        !           259:                        strcpy(sender, buf);
        !           260:                }
        !           261:                return;
        !           262:        }
        !           263:        /* break the line into tokens. */
        !           264:        sscanf(buf, "%s %s %s %s", wordfrom, uname, at, site);
        !           265:        if (isat(at))
        !           266:                /*
        !           267:                 * Some arpanet mail comes from "joe at mit-dms"
        !           268:                 * instead of "joe@mit-dms", so handle it here.
        !           269:                 */
        !           270:                sprintf(fbuf, "%s@%s", uname, site);
        !           271:        else
        !           272:                strcpy(fbuf, uname);
        !           273: }
        !           274: 
        !           275: isat(str)
        !           276: char *str;
        !           277: {
        !           278:        if (strcmp(str, "@")==0) return TRUE;
        !           279:        if (strcmp(str, "at")==0) return TRUE;
        !           280:        if (strcmp(str, "AT")==0) return TRUE;
        !           281:        return FALSE;
        !           282: }
        !           283: 
        !           284: findgroup(to, group)
        !           285: char *to;
        !           286: char *group;
        !           287: {
        !           288: #ifdef debug
        !           289:        printf("findgroup(%s)\n", to);
        !           290: #endif
        !           291: #ifdef fussy
        !           292:        /*
        !           293:         * Default unknown "to" fields to "general".  This gives you
        !           294:         * tight control over which newsgroups exist.
        !           295:         */
        !           296:        if (strcmp(to, "msgs")==0)
        !           297:                strcpy(group, "msgs");
        !           298:        else if (strcmp(to, "allmsgs")==0)
        !           299:                strcpy(group, "NET.allmsgs");
        !           300:        else if (strcmp(to, "csmsgs")==0)
        !           301:                strcpy(group, "NET.csmsgs");
        !           302:        else
        !           303:                strcpy(group, "general");
        !           304: #else
        !           305:        /*
        !           306:         * Allow any newsgroup.  This way you don't have to recompile
        !           307:         * recnews everytime you add a newsgroup.
        !           308:         */
        !           309:        strcpy(group, to);
        !           310: #endif
        !           311: }
        !           312: 
        !           313: /*
        !           314:  * Return the ptr in sp at which a character in sq appears;
        !           315:  * NULL if not found
        !           316:  *
        !           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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