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nfqws: fakeknown, udplen desync modes

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bol-van
2022-04-12 15:52:06 +03:00
parent 9919f3bc14
commit ffda684a43
15 changed files with 87 additions and 23 deletions
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20
nfq/darkmagic.c
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@@ -298,10 +298,12 @@ bool prepare_udp_segment4(
const struct sockaddr_in *src, const struct sockaddr_in *dst,
uint8_t ttl,
uint8_t fooling,
uint16_t padlen,
const void *data, uint16_t len,
uint8_t *buf, size_t *buflen)
{
uint16_t ip_payload_len = sizeof(struct udphdr) + len;
uint16_t datalen = len + padlen;
uint16_t ip_payload_len = sizeof(struct udphdr) + datalen;
uint16_t pktlen = sizeof(struct ip) + ip_payload_len;
if (pktlen>*buflen) return false;
@@ -309,10 +311,12 @@ bool prepare_udp_segment4(
struct udphdr *udp = (struct udphdr*)(ip+1);
uint8_t *payload = (uint8_t*)(udp+1);
fill_iphdr(ip, &src->sin_addr, &dst->sin_addr, pktlen, IPPROTO_UDP, ttl);
fill_udphdr(udp, src->sin_port, dst->sin_port, len);
fill_udphdr(udp, src->sin_port, dst->sin_port, datalen);
memcpy(payload,data,len);
memset(payload+len,0,padlen);
udp4_fix_checksum(udp,ip_payload_len,&ip->ip_src,&ip->ip_dst);
if (fooling & FOOL_BADSUM) udp->uh_sum^=htons(0xBEAF);
@@ -323,10 +327,12 @@ bool prepare_udp_segment6(
const struct sockaddr_in6 *src, const struct sockaddr_in6 *dst,
uint8_t ttl,
uint8_t fooling,
uint16_t padlen,
const void *data, uint16_t len,
uint8_t *buf, size_t *buflen)
{
uint16_t transport_payload_len = sizeof(struct udphdr) + len;
uint16_t datalen = len + padlen;
uint16_t transport_payload_len = sizeof(struct udphdr) + datalen;
uint16_t ip_payload_len = transport_payload_len +
8*!!((fooling & (FOOL_HOPBYHOP|FOOL_HOPBYHOP2))==FOOL_HOPBYHOP) +
16*!!(fooling & FOOL_HOPBYHOP2) +
@@ -384,9 +390,10 @@ bool prepare_udp_segment6(
uint8_t *payload = (uint8_t*)(udp+1);
fill_ip6hdr(ip6, &src->sin6_addr, &dst->sin6_addr, ip_payload_len, proto, ttl);
fill_udphdr(udp, src->sin6_port, dst->sin6_port, len);
fill_udphdr(udp, src->sin6_port, dst->sin6_port, datalen);
memcpy(payload,data,len);
memset(payload+len,0,padlen);
udp6_fix_checksum(udp,transport_payload_len,&ip6->ip6_src,&ip6->ip6_dst);
if (fooling & FOOL_BADSUM) udp->uh_sum^=htons(0xBEAF);
@@ -397,13 +404,14 @@ bool prepare_udp_segment(
const struct sockaddr *src, const struct sockaddr *dst,
uint8_t ttl,
uint8_t fooling,
uint16_t padlen,
const void *data, uint16_t len,
uint8_t *buf, size_t *buflen)
{
return (src->sa_family==AF_INET && dst->sa_family==AF_INET) ?
prepare_udp_segment4((struct sockaddr_in *)src,(struct sockaddr_in *)dst,ttl,fooling,data,len,buf,buflen) :
prepare_udp_segment4((struct sockaddr_in *)src,(struct sockaddr_in *)dst,ttl,fooling,padlen,data,len,buf,buflen) :
(src->sa_family==AF_INET6 && dst->sa_family==AF_INET6) ?
prepare_udp_segment6((struct sockaddr_in6 *)src,(struct sockaddr_in6 *)dst,ttl,fooling,data,len,buf,buflen) :
prepare_udp_segment6((struct sockaddr_in6 *)src,(struct sockaddr_in6 *)dst,ttl,fooling,padlen,data,len,buf,buflen) :
false;
}