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Annotation of 43BSD/contrib/nntp/server/access.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char    *sccsid = "@(#)access.c 1.4     (Berkeley) 3/12/86";
        !             3: #endif
        !             4: 
        !             5: #include "common.h"
        !             6: #include <sys/socket.h>
        !             7: #include <netinet/in.h>
        !             8: #include <arpa/inet.h>
        !             9: #include <netdb.h>
        !            10: 
        !            11: /*
        !            12:  * host_access -- determine if the client has permission to
        !            13:  *     read, transfer, and/or post news.  read->transfer.
        !            14:  *
        !            15:  *     Parameters:     "read" is a pointer to storage for
        !            16:  *                     an integer, which we set to 1 if the
        !            17:  *                     client can read news, 0 otherwise.
        !            18:  *
        !            19:  *                     "post" is a pointer to storage for
        !            20:  *                     an integer,which we set to 1 if the
        !            21:  *                     client can post news, 0 otherwise.
        !            22:  *
        !            23:  *     Returns:        Nothing.
        !            24:  *
        !            25:  *     Side effects:   None.
        !            26:  */
        !            27: 
        !            28: #ifdef LOG
        !            29: char   hostname[256];
        !            30: #endif
        !            31: 
        !            32: host_access(canread, canpost, canxfer)
        !            33: int    *canread, *canpost, *canxfer;
        !            34: {
        !            35:        char            hostornet[MAX_STRLEN];
        !            36:        char            readperm[MAX_STRLEN], postperm[MAX_STRLEN];
        !            37:        char            host_name[MAX_STRLEN], net_name[MAX_STRLEN];
        !            38:        char            line[MAX_STRLEN];
        !            39:        char            *cp;
        !            40:        int             ncanread, ncanpost, ncanxfer;
        !            41:        int             netmatch;
        !            42:        int             count, sockt, length;
        !            43:        unsigned long   net_addr;
        !            44:        struct netent   *np;
        !            45:        struct sockaddr_in sin;
        !            46:        struct hostent  *hp;
        !            47:        FILE            *acs_fp;
        !            48: 
        !            49:        *canread = *canpost = *canxfer = 0;
        !            50: 
        !            51:        sockt = fileno(stdin);
        !            52:        length = sizeof (struct sockaddr_in);
        !            53: #ifdef DEBUG
        !            54:        *canread = *canpost = *canxfer = 1;
        !            55:        return;
        !            56: #endif
        !            57: 
        !            58:        if (getpeername(sockt, (struct sockaddr *) &sin, &length) < 0) {
        !            59:                if (isatty(sockt)) {
        !            60: #ifdef LOG
        !            61:                        (void) strcpy(hostname, "stdin");
        !            62: #endif
        !            63:                        *canread = 1;
        !            64:                } else {
        !            65:                        syslog(LOG_ERR, "host_access: getpeername: %m");
        !            66: #ifdef LOG
        !            67:                        (void) strcpy(hostname, "unknown");
        !            68: #endif
        !            69:                }
        !            70:                return;
        !            71:        }
        !            72: 
        !            73:        /*
        !            74:         * At this point, sin.sin_addr.s_addr is the address of
        !            75:         * the host in network order.
        !            76:         */
        !            77: 
        !            78:        net_addr = inet_netof(sin.sin_addr);    /* net_addr in host order */
        !            79: 
        !            80:        np = getnetbyaddr(net_addr, AF_INET);
        !            81:        if (np != NULL)
        !            82:                (void) strcpy(net_name, np->n_name);
        !            83:        else
        !            84:                (void) strcpy(net_name,inet_ntoa(*(struct in_addr *)&net_addr));
        !            85: 
        !            86:        hp = gethostbyaddr((char *) &sin.sin_addr.s_addr, sizeof(long),
        !            87:                AF_INET);
        !            88:        if (hp != NULL)
        !            89:                (void) strcpy(host_name, hp->h_name);
        !            90:        else
        !            91:                (void) strcpy(host_name, inet_ntoa(sin.sin_addr));
        !            92: 
        !            93: #ifdef LOG
        !            94:        syslog(LOG_INFO, "%s connect\n", host_name);
        !            95:        (void) strcpy(hostname, host_name);
        !            96: #endif
        !            97: 
        !            98:        /*
        !            99:         * So, now we have host_name and net_name.
        !           100:         * Our strategy at this point is:
        !           101:         *
        !           102:         * for each line, get the first word
        !           103:         *
        !           104:         *      If it matches "host_name", we have a direct
        !           105:         *              match; parse and return.
        !           106:         *
        !           107:         *      If it matches "net_name", we have a net match;
        !           108:         *              parse and set flags.
        !           109:         *
        !           110:         *      If it matches the literal "default", note we have
        !           111:         *              a net match; parse.
        !           112:         */
        !           113: 
        !           114:        acs_fp = fopen(ACCESS_FILE, "r");
        !           115:        if (acs_fp == NULL)
        !           116:                return;
        !           117: 
        !           118:        while (fgets(line, sizeof(line), acs_fp) != NULL) {
        !           119:                if ((cp = index(line, '\n')) != NULL)
        !           120:                        *cp = '\0';
        !           121:                if ((cp = index(line, '#')) != NULL)
        !           122:                        *cp = '\0';
        !           123:                if (*line == '\0')
        !           124:                        continue;
        !           125: 
        !           126:                count = sscanf(line, "%s %s %s", hostornet, readperm, postperm);
        !           127: 
        !           128:                if (count < 3)
        !           129:                        continue;
        !           130: 
        !           131:                if (strcmp(hostornet, host_name) == 0) {
        !           132:                        *canread = (readperm[0] == 'r' || readperm[0] == 'R');
        !           133:                        *canxfer = (*canread || readperm[0] == 'X'
        !           134:                                             || readperm[0] == 'x');
        !           135:                        *canpost = (postperm[0] == 'p' || postperm[0] == 'P');
        !           136:                        (void) fclose(acs_fp);
        !           137:                        return;
        !           138:                }
        !           139: 
        !           140:                if (strcmp(hostornet, net_name) == 0 ||
        !           141:                    strcmp(hostornet, "default") == 0) {
        !           142:                        netmatch = 1;
        !           143:                        ncanread = (readperm[0] == 'r' || readperm[0] == 'R');
        !           144:                        ncanxfer = (ncanread || readperm[0] == 'X'
        !           145:                                             || readperm[0] == 'x');
        !           146:                        ncanpost = (postperm[0] == 'p' || postperm[0] == 'P');
        !           147:                }
        !           148:        }
        !           149: 
        !           150:        (void) fclose(acs_fp);
        !           151: 
        !           152:        if (netmatch) {
        !           153:                *canread = ncanread;
        !           154:                *canpost = ncanpost;
        !           155:                *canxfer = ncanxfer;
        !           156:        }
        !           157: }

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