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/*
 * chk_srlno.c
 *
 * serial number checker for BBS version of login
 *
 * perform 2 checks:
 *   use algorithm to verify validity
 *   make sure password is NOT in exclusion list
 *
 * "exclusion list" is a file (EXCL_FILE below) within with each
 *   line begins with a serial number, followed by an optional comment
 *   Any serial number appearing in the file is to be considered invalid.
 *
 * return 1 if serial number is valid, 0 if not
 */

#include <stdio.h>
#include <string.h>
#include "unumber.h"

#define SRLNUM_LEN	9
#define LBUF_LEN	20
#define EXCL_FILE	"/etc/noaccess"

int chk_srlno(s)
char *s;
{
	int c, susp, suspen;
	int ret;
	char lbuf[LBUF_LEN];
	FILE *fp;

	ret = (strlen(s) == SRLNUM_LEN);
	if (ret)
		ret = (sscanf(s, "%1d%3d%5d", &c, &susp, &suspen) == 3);
	if (ret)
		ret = (c >= 1 && c <= VERSIONS);
	if (ret) {
		c--;
		ret = (((suspen ^ magic3[c]) % magic2[c])
			== (susp ^ magic1[c]));
	}
	if (ret) {
		if (fp = fopen(EXCL_FILE, "r")) {
			while (fgets(lbuf, LBUF_LEN, fp)) {
				if (strncmp(lbuf, s, SRLNUM_LEN) == 0) {
					ret = 0;
					break;
				}
			}
			fclose(fp);
		}
	}
	return ret;
}

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