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Annotation of coherent/d/bin/chk_srlno.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * chk_srlno.c
        !             3:  *
        !             4:  * serial number checker for BBS version of login
        !             5:  *
        !             6:  * perform 2 checks:
        !             7:  *   use algorithm to verify validity
        !             8:  *   make sure password is NOT in exclusion list
        !             9:  *
        !            10:  * "exclusion list" is a file (EXCL_FILE below) within with each
        !            11:  *   line begins with a serial number, followed by an optional comment
        !            12:  *   Any serial number appearing in the file is to be considered invalid.
        !            13:  *
        !            14:  * return 1 if serial number is valid, 0 if not
        !            15:  */
        !            16: 
        !            17: #include <stdio.h>
        !            18: #include <string.h>
        !            19: #include "unumber.h"
        !            20: 
        !            21: #define SRLNUM_LEN     9
        !            22: #define LBUF_LEN       20
        !            23: #define EXCL_FILE      "/etc/noaccess"
        !            24: 
        !            25: int chk_srlno(s)
        !            26: char *s;
        !            27: {
        !            28:        int c, susp, suspen;
        !            29:        int ret;
        !            30:        char lbuf[LBUF_LEN];
        !            31:        FILE *fp;
        !            32: 
        !            33:        ret = (strlen(s) == SRLNUM_LEN);
        !            34:        if (ret)
        !            35:                ret = (sscanf(s, "%1d%3d%5d", &c, &susp, &suspen) == 3);
        !            36:        if (ret)
        !            37:                ret = (c >= 1 && c <= VERSIONS);
        !            38:        if (ret) {
        !            39:                c--;
        !            40:                ret = (((suspen ^ magic3[c]) % magic2[c])
        !            41:                        == (susp ^ magic1[c]));
        !            42:        }
        !            43:        if (ret) {
        !            44:                if (fp = fopen(EXCL_FILE, "r")) {
        !            45:                        while (fgets(lbuf, LBUF_LEN, fp)) {
        !            46:                                if (strncmp(lbuf, s, SRLNUM_LEN) == 0) {
        !            47:                                        ret = 0;
        !            48:                                        break;
        !            49:                                }
        !            50:                        }
        !            51:                        fclose(fp);
        !            52:                }
        !            53:        }
        !            54:        return ret;
        !            55: }

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