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#include "alloc.h"
#include "stralloc.h"
#include "open.h"
#include "cdbread.h"
#include "byte.h"
#include "fmt.h"
#include "getln.h"
#include "ip.h"
#include "str.h"
#include "ip_bit.h"
#include "rules.h"
stralloc rules_name = {0};
stralloc ipstring = {0};
static struct cdb c;
static int dorule(void (*callback)(char *,unsigned int)) {
char *data;
unsigned int datalen;
switch (cdb_find(&c,rules_name.s,rules_name.len)) {
case -1: return -1;
case 0: return 0;
}
datalen = cdb_datalen(&c);
data = alloc(datalen);
if (!data) return -1;
if (cdb_read(&c,data,datalen,cdb_datapos(&c)) == -1) {
alloc_free(data);
return -1;
}
callback(data, datalen);
alloc_free(data);
return 1;
}
static int doit(void (*callback)(char *,unsigned int),char *ip,char *host,char *info) {
int p;
int r;
int ipv6 = str_len(ip) - byte_chr(ip,str_len(ip),':');
if (info) { /* 1. info@ip */
if (!stralloc_copys(&rules_name,info)) return -1;
if (!stralloc_cats(&rules_name,"@")) return -1;
if (ipv6) {
if (!ip6_fmt_str(&ipstring,ip))
if (!stralloc_catb(&rules_name,ipstring.s,ipstring.len)) return -1;
}
else
if (!stralloc_cats(&rules_name,ip)) return -1;
r = dorule(callback);
if (r) return r;
if (host) { /* 2. info@=host */
if (!stralloc_copys(&rules_name,info)) return -1;
if (!stralloc_cats(&rules_name,"@=")) return -1;
if (!stralloc_cats(&rules_name,host)) return -1;
r = dorule(callback);
if (r) return r;
}
}
if (ipv6) { /* 3. IPv6/IPv4 */
if (!ip6_fmt_str(&ipstring,ip)) {
if (!stralloc_copyb(&rules_name,ipstring.s,ipstring.len)) return -1;
r = dorule(callback);
if (r) return r;
}
} else {
if (!stralloc_copys(&rules_name,ip)) return -1;
r = dorule(callback);
if (r) return r;
}
if (host) { /* 4. =host */
if (!stralloc_copys(&rules_name,"=")) return -1;
if (!stralloc_cats(&rules_name,host)) return -1;
r = dorule(callback);
if (r) return r;
}
if (!ipv6) { /* 5. IPv4 class-based */
if (!stralloc_copys(&rules_name,ip)) return -1;
while (rules_name.len > 0) {
if (ip[rules_name.len - 1] == '.') {
r = dorule(callback);
if (r) return r;
}
--rules_name.len;
}
}
if (ipv6) { /* 6. IPv6/IPv4 CIDR */
if (!ip6_bitstring(&ipstring,ip,128)) {
for (p = 129; p > 1; p--) {
if (!stralloc_copys(&rules_name,"^")) return -1;
if (!stralloc_catb(&rules_name,ipstring.s,p)) return -1;
r = dorule(callback);
if (r) return r;
}
}
} else {
if (!ip4_bitstring(&ipstring,ip,32)) {
for (p = 33; p > 1; p--) {
if (!stralloc_copys(&rules_name,"_")) return -1;
if (!stralloc_catb(&rules_name,ipstring.s,p)) return -1;
r = dorule(callback);
if (r) return r;
}
}
}
if (host) { /* 7. =host. */
while (*host) {
if (*host == '.') {
if (!stralloc_copys(&rules_name,"=")) return -1;
if (!stralloc_cats(&rules_name,host)) return -1;
r = dorule(callback);
if (r) return r;
}
++host;
}
if (!stralloc_copys(&rules_name,"=")) return -1; /* 8. = rule */
r = dorule(callback);
if (r) return r;
}
rules_name.len = 0;
return dorule(callback);
}
int rules(void (*callback)(char *,unsigned int),int fd,char *ip,char *host,char *info) {
int r;
cdb_init(&c,fd);
r = doit(callback,ip,host,info);
cdb_free(&c);
return r;
}
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