Problem - Kevin Tafuro

if (!(f = fopen(filename, "r"))) return 0;
if (!(buf = (char *)malloc(256))) {
fclose(f);
return 0;
}
while (fgets(buf + len, bufsz - len, f) != 0) {
len += strlen(buf + len);
if (buf[len - 1] != '\n') {
if (!(buf = (char *)realloc((tmp = buf), bufsz += 256))) {
fprintf(stderr, "%s line %d: out of memory\n", filename, ++lineno);
free(tmp);
fclose(f);
free_rules( );
return 0;
}
continue;
}
buf[--len] = 0;
lineno++;
for (tmp = buf; *tmp && isspace(*tmp); tmp++) len--;
while (len && isspace(tmp[len - 1])) len--;
tmp[len] = 0;
len = 0;
if (!tmp[0] || tmp[0] = = '#' || tmp[0] = = ';') continue;
memset(&rule, 0, sizeof(rule));
if (strncasecmp(tmp, "allow:", 6) && strncasecmp(tmp, "deny:", 5)) {
fprintf(stderr, "%s line %d: parse error; continuing anyway.\n",
filename, lineno);
continue;
}
if (!strncasecmp(tmp, "deny:", 5)) {
rule.action = SPC_HOST_DENY;
tmp += 5;
} else {
rule.action = SPC_HOST_ALLOW;
tmp += 6;
}
while (*tmp && isspace(*tmp)) tmp++;
if (!*tmp) {
fprintf(stderr, "%s line %d: parse error; continuing anyway.\n",
filename, lineno);
continue;
}
for (p = tmp; *p; tmp = p) {
while (*p && !isspace(*p)) p++;
if (*p) *p++ = 0;
if ((slash = strchr(tmp, '/')) != 0) {
*slash++ = 0;
rule.name = 0;
rule.addr = parse_addr(tmp);
rule.mask = make_mask(atoi(slash));
384 | Chapter 8: Authentication and Key Exchange
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