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zapret/nfq/darkmagic.c
bol-van 2aaa2f7cf3 Truncated history
2024-10-28 09:32:24 +03:00

1880 lines
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C
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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/param.h>
#include <errno.h>
#include <fcntl.h>
#ifndef IP_NODEFRAG
// for very old toolchains
#define IP_NODEFRAG 22
#endif
#include "darkmagic.h"
#include "helpers.h"
#include "params.h"
#include "nfqws.h"
#ifdef __CYGWIN__
#include <wlanapi.h>
#include <netlistmgr.h>
#endif
uint32_t net32_add(uint32_t netorder_value, uint32_t cpuorder_increment)
{
return htonl(ntohl(netorder_value)+cpuorder_increment);
}
uint32_t net16_add(uint16_t netorder_value, uint16_t cpuorder_increment)
{
return htons(ntohs(netorder_value)+cpuorder_increment);
}
uint8_t *tcp_find_option(struct tcphdr *tcp, uint8_t kind)
{
uint8_t *t = (uint8_t*)(tcp+1);
uint8_t *end = (uint8_t*)tcp + (tcp->th_off<<2);
while(t<end)
{
switch(*t)
{
case 0: // end
return NULL;
case 1: // noop
t++;
break;
default: // kind,len,data
if ((t+1)>=end || t[1]<2 || (t+t[1])>end)
return NULL;
if (*t==kind)
return t;
t+=t[1];
break;
}
}
return NULL;
}
uint32_t *tcp_find_timestamps(struct tcphdr *tcp)
{
uint8_t *t = tcp_find_option(tcp,8);
return (t && t[1]==10) ? (uint32_t*)(t+2) : NULL;
}
uint8_t tcp_find_scale_factor(const struct tcphdr *tcp)
{
uint8_t *scale = tcp_find_option((struct tcphdr*)tcp,3); // tcp option 3 - scale factor
if (scale && scale[1]==3) return scale[2];
return SCALE_NONE;
}
bool tcp_has_fastopen(const struct tcphdr *tcp)
{
uint8_t *opt;
// new style RFC7413
opt = tcp_find_option((struct tcphdr*)tcp, 34);
if (opt) return true;
// old style RFC6994
opt = tcp_find_option((struct tcphdr*)tcp, 254);
return opt && opt[1]>=4 && opt[2]==0xF9 && opt[3]==0x89;
}
// n prefix (nsport, nwsize) means network byte order
static void fill_tcphdr(
struct tcphdr *tcp, uint32_t fooling, uint8_t tcp_flags,
uint32_t nseq, uint32_t nack_seq,
uint16_t nsport, uint16_t ndport,
uint16_t nwsize, uint8_t scale_factor,
uint32_t *timestamps,
uint32_t badseq_increment,
uint32_t badseq_ack_increment,
uint16_t data_len)
{
char *tcpopt = (char*)(tcp+1);
uint8_t t=0;
memset(tcp,0,sizeof(*tcp));
tcp->th_sport = nsport;
tcp->th_dport = ndport;
if (fooling & FOOL_BADSEQ)
{
tcp->th_seq = net32_add(nseq,badseq_increment);
tcp->th_ack = net32_add(nack_seq,badseq_ack_increment);
}
else
{
tcp->th_seq = nseq;
tcp->th_ack = nack_seq;
}
tcp->th_off = 5;
if ((fooling & FOOL_DATANOACK) && !(tcp_flags & (TH_SYN|TH_RST)) && data_len)
tcp_flags &= ~TH_ACK;
*((uint8_t*)tcp+13)= tcp_flags;
tcp->th_win = nwsize;
if (fooling & FOOL_MD5SIG)
{
tcpopt[0] = 19; // kind
tcpopt[1] = 18; // len
*(uint32_t*)(tcpopt+2)=random();
*(uint32_t*)(tcpopt+6)=random();
*(uint32_t*)(tcpopt+10)=random();
*(uint32_t*)(tcpopt+14)=random();
t=18;
}
if (timestamps || (fooling & FOOL_TS))
{
tcpopt[t] = 8; // kind
tcpopt[t+1] = 10; // len
// forge only TSecr if orig timestamp is present
*(uint32_t*)(tcpopt+t+2) = timestamps ? timestamps[0] : -1;
*(uint32_t*)(tcpopt+t+6) = (timestamps && !(fooling & FOOL_TS)) ? timestamps[1] : -1;
t+=10;
}
if (scale_factor!=SCALE_NONE)
{
tcpopt[t++]=3;
tcpopt[t++]=3;
tcpopt[t++]=scale_factor;
}
while (t&3) tcpopt[t++]=1; // noop
tcp->th_off += t>>2;
tcp->th_sum = 0;
}
static uint16_t tcpopt_len(uint32_t fooling, const uint32_t *timestamps, uint8_t scale_factor)
{
uint16_t t=0;
if (fooling & FOOL_MD5SIG) t=18;
if ((fooling & FOOL_TS) || timestamps) t+=10;
if (scale_factor!=SCALE_NONE) t+=3;
return (t+3)&~3;
}
// n prefix (nsport, nwsize) means network byte order
static void fill_udphdr(struct udphdr *udp, uint16_t nsport, uint16_t ndport, uint16_t len_payload)
{
udp->uh_sport = nsport;
udp->uh_dport = ndport;
udp->uh_ulen = htons(len_payload+sizeof(struct udphdr));
udp->uh_sum = 0;
}
static void fill_iphdr(struct ip *ip, const struct in_addr *src, const struct in_addr *dst, uint16_t pktlen, uint8_t proto, uint8_t ttl, uint8_t tos)
{
ip->ip_tos = tos;
ip->ip_sum = 0;
ip->ip_off = 0;
ip->ip_v = 4;
ip->ip_hl = 5;
ip->ip_len = htons(pktlen);
ip->ip_id = 0;
ip->ip_ttl = ttl;
ip->ip_p = proto;
ip->ip_src = *src;
ip->ip_dst = *dst;
}
static void fill_ip6hdr(struct ip6_hdr *ip6, const struct in6_addr *src, const struct in6_addr *dst, uint16_t payloadlen, uint8_t proto, uint8_t ttl, uint32_t flow_label)
{
ip6->ip6_ctlun.ip6_un1.ip6_un1_flow = htonl(ntohl(flow_label) & 0x0FFFFFFF | 0x60000000);
ip6->ip6_ctlun.ip6_un1.ip6_un1_plen = htons(payloadlen);
ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt = proto;
ip6->ip6_ctlun.ip6_un1.ip6_un1_hlim = ttl;
ip6->ip6_src = *src;
ip6->ip6_dst = *dst;
}
bool prepare_tcp_segment4(
const struct sockaddr_in *src, const struct sockaddr_in *dst,
uint8_t tcp_flags,
uint32_t nseq, uint32_t nack_seq,
uint16_t nwsize,
uint8_t scale_factor,
uint32_t *timestamps,
uint8_t ttl,
uint8_t tos,
uint32_t fooling,
uint32_t badseq_increment,
uint32_t badseq_ack_increment,
const void *data, uint16_t len,
uint8_t *buf, size_t *buflen)
{
uint16_t tcpoptlen = tcpopt_len(fooling,timestamps,scale_factor);
uint16_t ip_payload_len = sizeof(struct tcphdr) + tcpoptlen + len;
uint16_t pktlen = sizeof(struct ip) + ip_payload_len;
if (pktlen>*buflen) return false;
struct ip *ip = (struct ip*)buf;
struct tcphdr *tcp = (struct tcphdr*)(ip+1);
uint8_t *payload = (uint8_t*)(tcp+1)+tcpoptlen;
fill_iphdr(ip, &src->sin_addr, &dst->sin_addr, pktlen, IPPROTO_TCP, ttl, tos);
fill_tcphdr(tcp,fooling,tcp_flags,nseq,nack_seq,src->sin_port,dst->sin_port,nwsize,scale_factor,timestamps,badseq_increment,badseq_ack_increment,len);
memcpy(payload,data,len);
tcp4_fix_checksum(tcp,ip_payload_len,&ip->ip_src,&ip->ip_dst);
if (fooling & FOOL_BADSUM) tcp->th_sum^=htons(0xBEAF);
*buflen = pktlen;
return true;
}
bool prepare_tcp_segment6(
const struct sockaddr_in6 *src, const struct sockaddr_in6 *dst,
uint8_t tcp_flags,
uint32_t nseq, uint32_t nack_seq,
uint16_t nwsize,
uint8_t scale_factor,
uint32_t *timestamps,
uint8_t ttl,
uint32_t flow_label,
uint32_t fooling,
uint32_t badseq_increment,
uint32_t badseq_ack_increment,
const void *data, uint16_t len,
uint8_t *buf, size_t *buflen)
{
uint16_t tcpoptlen = tcpopt_len(fooling,timestamps,scale_factor);
uint16_t transport_payload_len = sizeof(struct tcphdr) + tcpoptlen + len;
uint16_t ip_payload_len = transport_payload_len +
8*!!((fooling & (FOOL_HOPBYHOP|FOOL_HOPBYHOP2))==FOOL_HOPBYHOP) +
16*!!(fooling & FOOL_HOPBYHOP2) +
8*!!(fooling & FOOL_DESTOPT) +
8*!!(fooling & FOOL_IPFRAG1);
uint16_t pktlen = sizeof(struct ip6_hdr) + ip_payload_len;
if (pktlen>*buflen) return false;
struct ip6_hdr *ip6 = (struct ip6_hdr*)buf;
struct tcphdr *tcp = (struct tcphdr*)(ip6+1);
uint8_t proto = IPPROTO_TCP, *nexttype = NULL;
if (fooling & (FOOL_HOPBYHOP|FOOL_HOPBYHOP2))
{
struct ip6_hbh *hbh = (struct ip6_hbh*)tcp;
tcp = (struct tcphdr*)((uint8_t*)tcp+8);
memset(hbh,0,8);
// extra HOPBYHOP header. standard violation
if (fooling & FOOL_HOPBYHOP2)
{
hbh = (struct ip6_hbh*)tcp;
tcp = (struct tcphdr*)((uint8_t*)tcp+8);
memset(hbh,0,8);
}
hbh->ip6h_nxt = IPPROTO_TCP;
nexttype = &hbh->ip6h_nxt;
proto = IPPROTO_HOPOPTS;
}
if (fooling & FOOL_DESTOPT)
{
struct ip6_dest *dest = (struct ip6_dest*)tcp;
tcp = (struct tcphdr*)((uint8_t*)tcp+8);
memset(dest,0,8);
dest->ip6d_nxt = IPPROTO_TCP;
if (nexttype)
*nexttype = IPPROTO_DSTOPTS;
else
proto = IPPROTO_DSTOPTS;
nexttype = &dest->ip6d_nxt;
}
if (fooling & FOOL_IPFRAG1)
{
struct ip6_frag *frag = (struct ip6_frag*)tcp;
tcp = (struct tcphdr*)((uint8_t*)tcp+sizeof(struct ip6_frag));
frag->ip6f_nxt = IPPROTO_TCP;
frag->ip6f_ident = htonl(1+random()%0xFFFFFFFF);
frag->ip6f_reserved = 0;
frag->ip6f_offlg = 0;
if (nexttype)
*nexttype = IPPROTO_FRAGMENT;
else
proto = IPPROTO_FRAGMENT;
}
uint8_t *payload = (uint8_t*)(tcp+1)+tcpoptlen;
fill_ip6hdr(ip6, &src->sin6_addr, &dst->sin6_addr, ip_payload_len, proto, ttl, flow_label);
fill_tcphdr(tcp,fooling,tcp_flags,nseq,nack_seq,src->sin6_port,dst->sin6_port,nwsize,scale_factor,timestamps,badseq_increment,badseq_ack_increment,len);
memcpy(payload,data,len);
tcp6_fix_checksum(tcp,transport_payload_len,&ip6->ip6_src,&ip6->ip6_dst);
if (fooling & FOOL_BADSUM) tcp->th_sum^=htons(0xBEAF);
*buflen = pktlen;
return true;
}
bool prepare_tcp_segment(
const struct sockaddr *src, const struct sockaddr *dst,
uint8_t tcp_flags,
uint32_t nseq, uint32_t nack_seq,
uint16_t nwsize,
uint8_t scale_factor,
uint32_t *timestamps,
uint8_t ttl,
uint8_t tos, uint32_t flow_label,
uint32_t fooling,
uint32_t badseq_increment,
uint32_t badseq_ack_increment,
const void *data, uint16_t len,
uint8_t *buf, size_t *buflen)
{
return (src->sa_family==AF_INET && dst->sa_family==AF_INET) ?
prepare_tcp_segment4((struct sockaddr_in *)src,(struct sockaddr_in *)dst,tcp_flags,nseq,nack_seq,nwsize,scale_factor,timestamps,ttl,tos,fooling,badseq_increment,badseq_ack_increment,data,len,buf,buflen) :
(src->sa_family==AF_INET6 && dst->sa_family==AF_INET6) ?
prepare_tcp_segment6((struct sockaddr_in6 *)src,(struct sockaddr_in6 *)dst,tcp_flags,nseq,nack_seq,nwsize,scale_factor,timestamps,ttl,flow_label,fooling,badseq_increment,badseq_ack_increment,data,len,buf,buflen) :
false;
}
// padlen<0 means payload shrinking
bool prepare_udp_segment4(
const struct sockaddr_in *src, const struct sockaddr_in *dst,
uint8_t ttl,
uint8_t tos,
uint32_t fooling,
const uint8_t *padding, size_t padding_size,
int padlen,
const void *data, uint16_t len,
uint8_t *buf, size_t *buflen)
{
if ((len+padlen)<=0) padlen=-(int)len+1; // do not allow payload to be less that 1 byte
if ((len+padlen)>0xFFFF) padlen=0xFFFF-len; // do not allow payload size to exceed u16 range
if (padlen<0)
{
len+=padlen;
padlen=0;
}
uint16_t datalen = (uint16_t)(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;
struct ip *ip = (struct ip*)buf;
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, tos);
fill_udphdr(udp, src->sin_port, dst->sin_port, datalen);
memcpy(payload,data,len);
if (padding)
fill_pattern(payload+len,padlen,padding,padding_size);
else
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);
*buflen = pktlen;
return true;
}
bool prepare_udp_segment6(
const struct sockaddr_in6 *src, const struct sockaddr_in6 *dst,
uint8_t ttl,
uint32_t flow_label,
uint32_t fooling,
const uint8_t *padding, size_t padding_size,
int padlen,
const void *data, uint16_t len,
uint8_t *buf, size_t *buflen)
{
if ((len+padlen)<=0) padlen=-(int)len+1; // do not allow payload to be less that 1 byte
if ((len+padlen)>0xFFFF) padlen=0xFFFF-len; // do not allow payload size to exceed u16 range
if (padlen<0)
{
len+=padlen;
padlen=0;
}
uint16_t datalen = (uint16_t)(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) +
8*!!(fooling & FOOL_DESTOPT) +
8*!!(fooling & FOOL_IPFRAG1);
uint16_t pktlen = sizeof(struct ip6_hdr) + ip_payload_len;
if (pktlen>*buflen) return false;
struct ip6_hdr *ip6 = (struct ip6_hdr*)buf;
struct udphdr *udp = (struct udphdr*)(ip6+1);
uint8_t proto = IPPROTO_UDP, *nexttype = NULL;
if (fooling & (FOOL_HOPBYHOP|FOOL_HOPBYHOP2))
{
struct ip6_hbh *hbh = (struct ip6_hbh*)udp;
udp = (struct udphdr*)((uint8_t*)udp+8);
memset(hbh,0,8);
// extra HOPBYHOP header. standard violation
if (fooling & FOOL_HOPBYHOP2)
{
hbh = (struct ip6_hbh*)udp;
udp = (struct udphdr*)((uint8_t*)udp+8);
memset(hbh,0,8);
}
hbh->ip6h_nxt = IPPROTO_UDP;
nexttype = &hbh->ip6h_nxt;
proto = IPPROTO_HOPOPTS;
}
if (fooling & FOOL_DESTOPT)
{
struct ip6_dest *dest = (struct ip6_dest*)udp;
udp = (struct udphdr*)((uint8_t*)udp+8);
memset(dest,0,8);
dest->ip6d_nxt = IPPROTO_UDP;
if (nexttype)
*nexttype = IPPROTO_DSTOPTS;
else
proto = IPPROTO_DSTOPTS;
nexttype = &dest->ip6d_nxt;
}
if (fooling & FOOL_IPFRAG1)
{
struct ip6_frag *frag = (struct ip6_frag*)udp;
udp = (struct udphdr*)((uint8_t*)udp+sizeof(struct ip6_frag));
frag->ip6f_nxt = IPPROTO_UDP;
frag->ip6f_ident = htonl(1+random()%0xFFFFFFFF);
frag->ip6f_reserved = 0;
frag->ip6f_offlg = 0;
if (nexttype)
*nexttype = IPPROTO_FRAGMENT;
else
proto = IPPROTO_FRAGMENT;
}
uint8_t *payload = (uint8_t*)(udp+1);
fill_ip6hdr(ip6, &src->sin6_addr, &dst->sin6_addr, ip_payload_len, proto, ttl, flow_label);
fill_udphdr(udp, src->sin6_port, dst->sin6_port, datalen);
memcpy(payload,data,len);
if (padding)
fill_pattern(payload+len,padlen,padding,padding_size);
else
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);
*buflen = pktlen;
return true;
}
bool prepare_udp_segment(
const struct sockaddr *src, const struct sockaddr *dst,
uint8_t ttl,
uint8_t tos, uint32_t flow_label,
uint32_t fooling,
const uint8_t *padding, size_t padding_size,
int 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,tos,fooling,padding,padding_size,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,flow_label,fooling,padding,padding_size,padlen,data,len,buf,buflen) :
false;
}
bool ip6_insert_simple_hdr(uint8_t type, uint8_t *data_pkt, size_t len_pkt, uint8_t *buf, size_t *buflen)
{
if ((len_pkt+8)<=*buflen && len_pkt>=sizeof(struct ip6_hdr))
{
struct ip6_hdr *ip6 = (struct ip6_hdr *)buf;
struct ip6_ext *hdr = (struct ip6_ext*)(ip6+1);
*ip6 = *(struct ip6_hdr*)data_pkt;
memset(hdr,0,8);
memcpy((uint8_t*)hdr+8, data_pkt+sizeof(struct ip6_hdr), len_pkt-sizeof(struct ip6_hdr));
hdr->ip6e_nxt = ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt;
ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt = type;
ip6->ip6_ctlun.ip6_un1.ip6_un1_plen = net16_add(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen, 8);
*buflen = len_pkt + 8;
return true;
}
return false;
}
// split ipv4 packet into 2 fragments at data payload position frag_pos
bool ip_frag4(
const uint8_t *pkt, size_t pkt_size,
size_t frag_pos, uint32_t ident,
uint8_t *pkt1, size_t *pkt1_size,
uint8_t *pkt2, size_t *pkt2_size)
{
uint16_t hdrlen, payload_len;
// frag_pos must be 8-byte aligned
if (frag_pos & 7 || pkt_size < sizeof(struct ip)) return false;
payload_len = htons(((struct ip *)pkt)->ip_len);
hdrlen = ((struct ip *)pkt)->ip_hl<<2;
if (payload_len>pkt_size || hdrlen>pkt_size || hdrlen>payload_len) return false;
payload_len -= hdrlen;
if (frag_pos>=payload_len || *pkt1_size<(hdrlen+frag_pos) || *pkt2_size<(hdrlen+payload_len-frag_pos)) return false;
memcpy(pkt1, pkt, hdrlen+frag_pos);
((struct ip*)pkt1)->ip_off = htons(IP_MF);
((struct ip*)pkt1)->ip_len = htons(hdrlen+frag_pos);
if (ident!=(uint32_t)-1) ((struct ip*)pkt1)->ip_id = (uint16_t)ident;
*pkt1_size=hdrlen+frag_pos;
ip4_fix_checksum((struct ip *)pkt1);
memcpy(pkt2, pkt, hdrlen);
memcpy(pkt2+hdrlen, pkt+hdrlen+frag_pos, payload_len-frag_pos);
((struct ip*)pkt2)->ip_off = htons((uint16_t)frag_pos>>3 & IP_OFFMASK);
((struct ip*)pkt2)->ip_len = htons(hdrlen+payload_len-frag_pos);
if (ident!=(uint32_t)-1) ((struct ip*)pkt2)->ip_id = (uint16_t)ident;
*pkt2_size=hdrlen+payload_len-frag_pos;
ip4_fix_checksum((struct ip *)pkt2);
return true;
}
bool ip_frag6(
const uint8_t *pkt, size_t pkt_size,
size_t frag_pos, uint32_t ident,
uint8_t *pkt1, size_t *pkt1_size,
uint8_t *pkt2, size_t *pkt2_size)
{
size_t payload_len, unfragmentable;
uint8_t *last_header_type;
uint8_t proto;
struct ip6_frag *frag;
const uint8_t *payload;
if (frag_pos & 7 || pkt_size < sizeof(struct ip6_hdr)) return false;
payload_len = sizeof(struct ip6_hdr) + htons(((struct ip6_hdr*)pkt)->ip6_ctlun.ip6_un1.ip6_un1_plen);
if (pkt_size < payload_len) return false;
payload = pkt;
proto_skip_ipv6((uint8_t**)&payload, &payload_len, &proto, &last_header_type);
unfragmentable = payload - pkt;
//printf("pkt_size=%zu FRAG_POS=%zu payload_len=%zu unfragmentable=%zu dh=%zu\n",pkt_size,frag_pos,payload_len,unfragmentable,last_header_type - pkt);
if (frag_pos>=payload_len ||
*pkt1_size<(unfragmentable + sizeof(struct ip6_frag) + frag_pos) ||
*pkt2_size<(unfragmentable + sizeof(struct ip6_frag) + payload_len - frag_pos))
{
return false;
}
memcpy(pkt1, pkt, unfragmentable);
((struct ip6_hdr*)pkt1)->ip6_ctlun.ip6_un1.ip6_un1_plen = htons(unfragmentable - sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + frag_pos);
pkt1[last_header_type - pkt] = IPPROTO_FRAGMENT;
frag = (struct ip6_frag*)(pkt1 + unfragmentable);
frag->ip6f_nxt = proto;
frag->ip6f_reserved = 0;
frag->ip6f_offlg = IP6F_MORE_FRAG;
frag->ip6f_ident = ident;
memcpy(frag+1, pkt + unfragmentable, frag_pos);
*pkt1_size = unfragmentable + sizeof(struct ip6_frag) + frag_pos;
memcpy(pkt2, pkt, sizeof(struct ip6_hdr));
((struct ip6_hdr*)pkt2)->ip6_ctlun.ip6_un1.ip6_un1_plen = htons(unfragmentable - sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + payload_len - frag_pos);
pkt2[last_header_type - pkt] = IPPROTO_FRAGMENT;
frag = (struct ip6_frag*)(pkt2 + unfragmentable);
frag->ip6f_nxt = proto;
frag->ip6f_reserved = 0;
frag->ip6f_offlg = htons(frag_pos);
frag->ip6f_ident = ident;
memcpy(frag+1, pkt + unfragmentable + frag_pos, payload_len - frag_pos);
*pkt2_size = unfragmentable + sizeof(struct ip6_frag) + payload_len - frag_pos;
return true;
}
bool ip_frag(
const uint8_t *pkt, size_t pkt_size,
size_t frag_pos, uint32_t ident,
uint8_t *pkt1, size_t *pkt1_size,
uint8_t *pkt2, size_t *pkt2_size)
{
if (proto_check_ipv4(pkt,pkt_size))
return ip_frag4(pkt,pkt_size,frag_pos,ident,pkt1,pkt1_size,pkt2,pkt2_size);
else if (proto_check_ipv6(pkt,pkt_size))
return ip_frag6(pkt,pkt_size,frag_pos,ident,pkt1,pkt1_size,pkt2,pkt2_size);
else
return false;
}
void rewrite_ttl(struct ip *ip, struct ip6_hdr *ip6, uint8_t ttl)
{
if (ip) ip->ip_ttl = ttl;
if (ip6) ip6->ip6_ctlun.ip6_un1.ip6_un1_hlim = ttl;
}
void extract_ports(const struct tcphdr *tcphdr, const struct udphdr *udphdr, uint8_t *proto, uint16_t *sport, uint16_t *dport)
{
if (sport) *sport = htons(tcphdr ? tcphdr->th_sport : udphdr ? udphdr->uh_sport : 0);
if (dport) *dport = htons(tcphdr ? tcphdr->th_dport : udphdr ? udphdr->uh_dport : 0);
if (proto) *proto = tcphdr ? IPPROTO_TCP : udphdr ? IPPROTO_UDP : -1;
}
void extract_endpoints(const struct ip *ip,const struct ip6_hdr *ip6hdr,const struct tcphdr *tcphdr,const struct udphdr *udphdr, struct sockaddr_storage *src, struct sockaddr_storage *dst)
{
if (ip)
{
struct sockaddr_in *si;
if (dst)
{
si = (struct sockaddr_in*)dst;
si->sin_family = AF_INET;
si->sin_port = tcphdr ? tcphdr->th_dport : udphdr ? udphdr->uh_dport : 0;
si->sin_addr = ip->ip_dst;
}
if (src)
{
si = (struct sockaddr_in*)src;
si->sin_family = AF_INET;
si->sin_port = tcphdr ? tcphdr->th_sport : udphdr ? udphdr->uh_sport : 0;
si->sin_addr = ip->ip_src;
}
}
else if (ip6hdr)
{
struct sockaddr_in6 *si;
if (dst)
{
si = (struct sockaddr_in6*)dst;
si->sin6_family = AF_INET6;
si->sin6_port = tcphdr ? tcphdr->th_dport : udphdr ? udphdr->uh_dport : 0;
si->sin6_addr = ip6hdr->ip6_dst;
si->sin6_flowinfo = 0;
si->sin6_scope_id = 0;
}
if (src)
{
si = (struct sockaddr_in6*)src;
si->sin6_family = AF_INET6;
si->sin6_port = tcphdr ? tcphdr->th_sport : udphdr ? udphdr->uh_sport : 0;
si->sin6_addr = ip6hdr->ip6_src;
si->sin6_flowinfo = 0;
si->sin6_scope_id = 0;
}
}
}
const char *proto_name(uint8_t proto)
{
switch(proto)
{
case IPPROTO_TCP:
return "tcp";
case IPPROTO_UDP:
return "udp";
case IPPROTO_ICMP:
return "icmp";
case IPPROTO_ICMPV6:
return "icmp6";
case IPPROTO_IGMP:
return "igmp";
case IPPROTO_ESP:
return "esp";
case IPPROTO_AH:
return "ah";
case IPPROTO_IPV6:
return "6in4";
case IPPROTO_IPIP:
return "4in4";
#ifdef IPPROTO_GRE
case IPPROTO_GRE:
return "gre";
#endif
#ifdef IPPROTO_SCTP
case IPPROTO_SCTP:
return "sctp";
#endif
default:
return NULL;
}
}
static void str_proto_name(char *s, size_t s_len, uint8_t proto)
{
const char *name = proto_name(proto);
if (name)
snprintf(s,s_len,"%s",name);
else
snprintf(s,s_len,"%u",proto);
}
uint16_t family_from_proto(uint8_t l3proto)
{
switch(l3proto)
{
case IPPROTO_IP: return AF_INET;
case IPPROTO_IPV6: return AF_INET6;
default: return -1;
}
}
static void str_srcdst_ip(char *s, size_t s_len, const void *saddr,const void *daddr)
{
char s_ip[16],d_ip[16];
*s_ip=*d_ip=0;
inet_ntop(AF_INET, saddr, s_ip, sizeof(s_ip));
inet_ntop(AF_INET, daddr, d_ip, sizeof(d_ip));
snprintf(s,s_len,"%s => %s",s_ip,d_ip);
}
void str_ip(char *s, size_t s_len, const struct ip *ip)
{
char ss[35],s_proto[16];
str_srcdst_ip(ss,sizeof(ss),&ip->ip_src,&ip->ip_dst);
str_proto_name(s_proto,sizeof(s_proto),ip->ip_p);
snprintf(s,s_len,"%s proto=%s ttl=%u",ss,s_proto,ip->ip_ttl);
}
void print_ip(const struct ip *ip)
{
char s[66];
str_ip(s,sizeof(s),ip);
printf("%s",s);
}
void str_srcdst_ip6(char *s, size_t s_len, const void *saddr,const void *daddr)
{
char s_ip[40],d_ip[40];
*s_ip=*d_ip=0;
inet_ntop(AF_INET6, saddr, s_ip, sizeof(s_ip));
inet_ntop(AF_INET6, daddr, d_ip, sizeof(d_ip));
snprintf(s,s_len,"%s => %s",s_ip,d_ip);
}
void str_ip6hdr(char *s, size_t s_len, const struct ip6_hdr *ip6hdr, uint8_t proto)
{
char ss[83],s_proto[16];
str_srcdst_ip6(ss,sizeof(ss),&ip6hdr->ip6_src,&ip6hdr->ip6_dst);
str_proto_name(s_proto,sizeof(s_proto),proto);
snprintf(s,s_len,"%s proto=%s ttl=%u",ss,s_proto,ip6hdr->ip6_hlim);
}
void print_ip6hdr(const struct ip6_hdr *ip6hdr, uint8_t proto)
{
char s[128];
str_ip6hdr(s,sizeof(s),ip6hdr,proto);
printf("%s",s);
}
void str_tcphdr(char *s, size_t s_len, const struct tcphdr *tcphdr)
{
char flags[7],*f=flags;
if (tcphdr->th_flags & TH_SYN) *f++='S';
if (tcphdr->th_flags & TH_ACK) *f++='A';
if (tcphdr->th_flags & TH_RST) *f++='R';
if (tcphdr->th_flags & TH_FIN) *f++='F';
if (tcphdr->th_flags & TH_PUSH) *f++='P';
if (tcphdr->th_flags & TH_URG) *f++='U';
*f=0;
snprintf(s,s_len,"sport=%u dport=%u flags=%s seq=%u ack_seq=%u",htons(tcphdr->th_sport),htons(tcphdr->th_dport),flags,htonl(tcphdr->th_seq),htonl(tcphdr->th_ack));
}
void print_tcphdr(const struct tcphdr *tcphdr)
{
char s[80];
str_tcphdr(s,sizeof(s),tcphdr);
printf("%s",s);
}
void str_udphdr(char *s, size_t s_len, const struct udphdr *udphdr)
{
snprintf(s,s_len,"sport=%u dport=%u",htons(udphdr->uh_sport),htons(udphdr->uh_dport));
}
void print_udphdr(const struct udphdr *udphdr)
{
char s[30];
str_udphdr(s,sizeof(s),udphdr);
printf("%s",s);
}
bool proto_check_ipv4(const uint8_t *data, size_t len)
{
return len >= 20 && (data[0] & 0xF0) == 0x40 &&
len >= ((data[0] & 0x0F) << 2);
}
// move to transport protocol
void proto_skip_ipv4(uint8_t **data, size_t *len)
{
size_t l;
l = (**data & 0x0F) << 2;
*data += l;
*len -= l;
}
bool proto_check_tcp(const uint8_t *data, size_t len)
{
return len >= 20 && len >= ((data[12] & 0xF0) >> 2);
}
void proto_skip_tcp(uint8_t **data, size_t *len)
{
size_t l;
l = ((*data)[12] & 0xF0) >> 2;
*data += l;
*len -= l;
}
bool proto_check_udp(const uint8_t *data, size_t len)
{
return len >= 8 && len>=(data[4]<<8 | data[5]);
}
void proto_skip_udp(uint8_t **data, size_t *len)
{
*data += 8;
*len -= 8;
}
bool proto_check_ipv6(const uint8_t *data, size_t len)
{
return len >= 40 && (data[0] & 0xF0) == 0x60 &&
(len - 40) >= htons(*(uint16_t*)(data + 4)); // payload length
}
// move to transport protocol
// proto_type = 0 => error
void proto_skip_ipv6(uint8_t **data, size_t *len, uint8_t *proto_type, uint8_t **last_header_type)
{
size_t hdrlen;
uint8_t HeaderType;
if (proto_type) *proto_type = 0; // put error in advance
HeaderType = (*data)[6]; // NextHeader field
if (last_header_type) *last_header_type = (*data)+6;
*data += 40; *len -= 40; // skip ipv6 base header
while (*len > 0) // need at least one byte for NextHeader field
{
switch (HeaderType)
{
case 0: // Hop-by-Hop Options
case 43: // routing
case 51: // authentication
case 60: // Destination Options
case 135: // mobility
case 139: // Host Identity Protocol Version v2
case 140: // Shim6
if (*len < 2) return; // error
hdrlen = 8 + ((*data)[1] << 3);
break;
case 44: // fragment. length fixed to 8, hdrlen field defined as reserved
hdrlen = 8;
break;
case 59: // no next header
return; // error
default:
// we found some meaningful payload. it can be tcp, udp, icmp or some another exotic shit
if (proto_type) *proto_type = HeaderType;
return;
}
if (*len < hdrlen) return; // error
HeaderType = **data;
if (last_header_type) *last_header_type = *data;
// advance to the next header location
*len -= hdrlen;
*data += hdrlen;
}
// we have garbage
}
void proto_dissect_l3l4(
uint8_t *data, size_t len,
struct ip **ip, struct ip6_hdr **ip6,
uint8_t *proto,
struct tcphdr **tcp,
struct udphdr **udp,
size_t *transport_len,
uint8_t **data_payload, size_t *len_payload)
{
*ip = NULL;
*ip6 = NULL;
*proto = 0;
*tcp = NULL;
*transport_len = 0;
*udp = NULL;
*data_payload = NULL;
*len_payload = 0;
if (proto_check_ipv4(data, len))
{
*ip = (struct ip *) data;
*proto = (*ip)->ip_p;
proto_skip_ipv4(&data, &len);
}
else if (proto_check_ipv6(data, len))
{
*ip6 = (struct ip6_hdr *) data;
proto_skip_ipv6(&data, &len, proto, NULL);
}
else
{
return;
}
if (*proto==IPPROTO_TCP && proto_check_tcp(data, len))
{
*tcp = (struct tcphdr *) data;
*transport_len = len;
proto_skip_tcp(&data, &len);
*data_payload = data;
*len_payload = len;
}
else if (*proto==IPPROTO_UDP && proto_check_udp(data, len))
{
*udp = (struct udphdr *) data;
*transport_len = len;
proto_skip_udp(&data, &len);
*data_payload = data;
*len_payload = len;
}
}
bool tcp_synack_segment(const struct tcphdr *tcphdr)
{
/* check for set bits in TCP hdr */
return ((tcphdr->th_flags & (TH_URG|TH_ACK|TH_PUSH|TH_RST|TH_SYN|TH_FIN)) == (TH_ACK|TH_SYN));
}
bool tcp_syn_segment(const struct tcphdr *tcphdr)
{
/* check for set bits in TCP hdr */
return ((tcphdr->th_flags & (TH_URG|TH_ACK|TH_PUSH|TH_RST|TH_SYN|TH_FIN)) == TH_SYN);
}
bool tcp_ack_segment(const struct tcphdr *tcphdr)
{
/* check for set bits in TCP hdr */
return ((tcphdr->th_flags & (TH_URG|TH_ACK|TH_PUSH|TH_RST|TH_SYN|TH_FIN)) == TH_ACK);
}
void tcp_rewrite_wscale(struct tcphdr *tcp, uint8_t scale_factor)
{
uint8_t *scale,scale_factor_old;
if (scale_factor!=SCALE_NONE)
{
scale = tcp_find_option(tcp,3); // tcp option 3 - scale factor
if (scale && scale[1]==3) // length should be 3
{
scale_factor_old=scale[2];
// do not allow increasing scale factor
if (scale_factor>=scale_factor_old)
DLOG("Scale factor %u unchanged\n", scale_factor_old);
else
{
scale[2]=scale_factor;
DLOG("Scale factor change %u => %u\n", scale_factor_old, scale_factor);
}
}
}
}
// scale_factor=SCALE_NONE - do not change
void tcp_rewrite_winsize(struct tcphdr *tcp, uint16_t winsize, uint8_t scale_factor)
{
uint16_t winsize_old;
winsize_old = htons(tcp->th_win); // << scale_factor;
tcp->th_win = htons(winsize);
DLOG("Window size change %u => %u\n", winsize_old, winsize);
tcp_rewrite_wscale(tcp, scale_factor);
}
#ifdef __CYGWIN__
static HANDLE w_filter = NULL;
static OVERLAPPED ovl = { .hEvent = NULL };
static const struct str_list_head *wlan_filter_ssid = NULL, *nlm_filter_net = NULL;
static DWORD logical_net_filter_tick=0;
uint32_t w_win32_error=0;
INetworkListManager* pNetworkListManager=NULL;
static void guid2str(const GUID *guid, char *str)
{
snprintf(str,37, "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X", guid->Data1, guid->Data2, guid->Data3, guid->Data4[0], guid->Data4[1], guid->Data4[2], guid->Data4[3], guid->Data4[4], guid->Data4[5], guid->Data4[6], guid->Data4[7]);
}
static bool str2guid(const char* str, GUID *guid)
{
unsigned int u[11],k;
if (36 != strlen(str) || 11 != sscanf(str, "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X", u+0, u+1, u+2, u+3, u+4, u+5, u+6, u+7, u+8, u+9, u+10))
return false;
guid->Data1 = u[0];
if ((u[1] & 0xFFFF0000) || (u[2] & 0xFFFF0000)) return false;
guid->Data2 = (USHORT)u[1];
guid->Data3 = (USHORT)u[2];
for (k = 0; k < 8; k++)
{
if (u[k+3] & 0xFFFFFF00) return false;
guid->Data4[k] = (UCHAR)u[k+3];
}
return true;
}
static const char *sNetworkCards="SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkCards";
// get adapter name from guid string
static bool AdapterID2Name(const GUID *guid,char *name,DWORD name_len)
{
char sguid[39],sidx[32],val[256];
HKEY hkNetworkCards,hkCard;
DWORD dwIndex,dwLen;
bool bRet = false;
WCHAR namew[128];
DWORD namew_len;
if (name_len<2) return false;
if ((w_win32_error = RegOpenKeyExA(HKEY_LOCAL_MACHINE,sNetworkCards,0,KEY_ENUMERATE_SUB_KEYS,&hkNetworkCards)) == ERROR_SUCCESS)
{
guid2str(guid, sguid+1);
sguid[0]='{';
sguid[37]='}';
sguid[38]='\0';
for (dwIndex=0;;dwIndex++)
{
dwLen=sizeof(sidx)-1;
w_win32_error = RegEnumKeyExA(hkNetworkCards,dwIndex,sidx,&dwLen,NULL,NULL,NULL,NULL);
if (w_win32_error == ERROR_SUCCESS)
{
sidx[dwLen]='\0';
if ((w_win32_error = RegOpenKeyExA(hkNetworkCards,sidx,0,KEY_QUERY_VALUE,&hkCard)) == ERROR_SUCCESS)
{
dwLen=sizeof(val)-1;
if ((w_win32_error = RegQueryValueExA(hkCard,"ServiceName",NULL,NULL,val,&dwLen)) == ERROR_SUCCESS)
{
val[dwLen]='\0';
if (!strcmp(val,sguid))
{
namew_len = sizeof(namew)-sizeof(WCHAR);
if ((w_win32_error = RegQueryValueExW(hkCard,L"Description",NULL,NULL,(LPBYTE)namew,&namew_len)) == ERROR_SUCCESS)
{
namew[namew_len/sizeof(WCHAR)]=L'\0';
if (WideCharToMultiByte(CP_UTF8, 0, namew, -1, name, name_len, NULL, NULL))
bRet = true;
}
}
}
RegCloseKey(hkCard);
}
if (bRet) break;
}
else
break;
}
RegCloseKey(hkNetworkCards);
}
return bRet;
}
bool win_dark_init(const struct str_list_head *ssid_filter, const struct str_list_head *nlm_filter)
{
win_dark_deinit();
if (LIST_EMPTY(ssid_filter)) ssid_filter=NULL;
if (LIST_EMPTY(nlm_filter)) nlm_filter=NULL;
if (nlm_filter)
{
if (SUCCEEDED(w_win32_error = CoInitialize(NULL)))
{
if (FAILED(w_win32_error = CoCreateInstance(&CLSID_NetworkListManager, NULL, CLSCTX_ALL, &IID_INetworkListManager, (LPVOID*)&pNetworkListManager)))
{
CoUninitialize();
return false;
}
}
else
return false;
}
nlm_filter_net = nlm_filter;
wlan_filter_ssid = ssid_filter;
return true;
}
bool win_dark_deinit(void)
{
if (pNetworkListManager)
{
pNetworkListManager->lpVtbl->Release(pNetworkListManager);
pNetworkListManager = NULL;
}
if (nlm_filter_net) CoUninitialize();
wlan_filter_ssid = nlm_filter_net = NULL;
}
bool nlm_list(bool bAll)
{
bool bRet = true;
if (SUCCEEDED(w_win32_error = CoInitialize(NULL)))
{
INetworkListManager* pNetworkListManager;
if (SUCCEEDED(w_win32_error = CoCreateInstance(&CLSID_NetworkListManager, NULL, CLSCTX_ALL, &IID_INetworkListManager, (LPVOID*)&pNetworkListManager)))
{
IEnumNetworks* pEnumNetworks;
if (SUCCEEDED(w_win32_error = pNetworkListManager->lpVtbl->GetNetworks(pNetworkListManager, NLM_ENUM_NETWORK_ALL, &pEnumNetworks)))
{
INetwork *pNet;
INetworkConnection *pConn;
IEnumNetworkConnections *pEnumConnections;
VARIANT_BOOL bIsConnected, bIsConnectedInet;
NLM_NETWORK_CATEGORY category;
GUID idNet, idAdapter;
BSTR bstrName;
char Name[128],Name2[128];
int connected;
for (connected = 1; connected >= !bAll; connected--)
{
for (;;)
{
if (FAILED(w_win32_error = pEnumNetworks->lpVtbl->Next(pEnumNetworks, 1, &pNet, NULL)))
{
bRet = false;
break;
}
if (w_win32_error != S_OK) break;
if (SUCCEEDED(w_win32_error = pNet->lpVtbl->get_IsConnected(pNet, &bIsConnected)) &&
SUCCEEDED(w_win32_error = pNet->lpVtbl->get_IsConnectedToInternet(pNet, &bIsConnectedInet)) &&
SUCCEEDED(w_win32_error = pNet->lpVtbl->GetNetworkId(pNet, &idNet)) &&
SUCCEEDED(w_win32_error = pNet->lpVtbl->GetCategory(pNet, &category)) &&
SUCCEEDED(w_win32_error = pNet->lpVtbl->GetName(pNet, &bstrName)))
{
if (!!bIsConnected == connected)
{
if (WideCharToMultiByte(CP_UTF8, 0, bstrName, -1, Name, sizeof(Name), NULL, NULL))
{
printf("Name : %s", Name);
if (bIsConnected) printf(" (connected)");
if (bIsConnectedInet) printf(" (inet)");
printf(" (%s)\n",
category==NLM_NETWORK_CATEGORY_PUBLIC ? "public" :
category==NLM_NETWORK_CATEGORY_PRIVATE ? "private" :
category==NLM_NETWORK_CATEGORY_DOMAIN_AUTHENTICATED ? "domain" :
"unknown");
guid2str(&idNet, Name);
printf("NetID : %s\n", Name);
if (connected && SUCCEEDED(w_win32_error = pNet->lpVtbl->GetNetworkConnections(pNet, &pEnumConnections)))
{
while ((w_win32_error = pEnumConnections->lpVtbl->Next(pEnumConnections, 1, &pConn, NULL))==S_OK)
{
if (SUCCEEDED(w_win32_error = pConn->lpVtbl->GetAdapterId(pConn,&idAdapter)))
{
guid2str(&idAdapter, Name);
if (AdapterID2Name(&idAdapter,Name2,sizeof(Name2)))
printf("Adapter : %s (%s)\n", Name2, Name);
else
printf("Adapter : %s\n", Name);
}
pConn->lpVtbl->Release(pConn);
}
pEnumConnections->lpVtbl->Release(pEnumConnections);
}
printf("\n");
}
else
{
w_win32_error = HRESULT_FROM_WIN32(GetLastError());
bRet = false;
}
}
SysFreeString(bstrName);
}
else
bRet = false;
pNet->lpVtbl->Release(pNet);
if (!bRet) break;
}
if (!bRet) break;
pEnumNetworks->lpVtbl->Reset(pEnumNetworks);
}
pEnumNetworks->lpVtbl->Release(pEnumNetworks);
}
else
bRet = false;
pNetworkListManager->lpVtbl->Release(pNetworkListManager);
}
else
bRet = false;
}
else
bRet = false;
CoUninitialize();
return bRet;
}
static bool nlm_filter_match(const struct str_list_head *nlm_list)
{
// no filter given. always matches.
if (!nlm_list || LIST_EMPTY(nlm_list))
{
w_win32_error = 0;
return true;
}
bool bRet = true, bMatch = false;
IEnumNetworks* pEnum;
if (SUCCEEDED(w_win32_error = pNetworkListManager->lpVtbl->GetNetworks(pNetworkListManager, NLM_ENUM_NETWORK_CONNECTED, &pEnum)))
{
INetwork* pNet;
GUID idNet,g;
BSTR bstrName;
char Name[128];
struct str_list *nlm;
for (;;)
{
if (FAILED(w_win32_error = pEnum->lpVtbl->Next(pEnum, 1, &pNet, NULL)))
{
bRet = false;
break;
}
if (w_win32_error != S_OK) break;
if (SUCCEEDED(w_win32_error = pNet->lpVtbl->GetNetworkId(pNet, &idNet)) &&
SUCCEEDED(w_win32_error = pNet->lpVtbl->GetName(pNet, &bstrName)))
{
if (WideCharToMultiByte(CP_UTF8, 0, bstrName, -1, Name, sizeof(Name), NULL, NULL))
{
LIST_FOREACH(nlm, nlm_list, next)
{
bMatch = !strcmp(Name,nlm->str) || str2guid(nlm->str,&g) && !memcmp(&idNet,&g,sizeof(GUID));
if (bMatch) break;
}
}
else
{
w_win32_error = HRESULT_FROM_WIN32(GetLastError());
bRet = false;
}
SysFreeString(bstrName);
}
else
bRet = false;
pNet->lpVtbl->Release(pNet);
if (!bRet || bMatch) break;
}
pEnum->lpVtbl->Release(pEnum);
}
else
bRet = false;
return bRet && bMatch;
}
static bool wlan_filter_match(const struct str_list_head *ssid_list)
{
DWORD dwCurVersion;
HANDLE hClient = NULL;
PWLAN_INTERFACE_INFO_LIST pIfList = NULL;
PWLAN_INTERFACE_INFO pIfInfo;
PWLAN_CONNECTION_ATTRIBUTES pConnectInfo;
DWORD connectInfoSize, k;
bool bRes;
struct str_list *ssid;
size_t len;
// no filter given. always matches.
if (!ssid_list || LIST_EMPTY(ssid_list))
{
w_win32_error = 0;
return true;
}
w_win32_error = WlanOpenHandle(2, NULL, &dwCurVersion, &hClient);
if (w_win32_error != ERROR_SUCCESS) goto fail;
w_win32_error = WlanEnumInterfaces(hClient, NULL, &pIfList);
if (w_win32_error != ERROR_SUCCESS) goto fail;
for (k = 0; k < pIfList->dwNumberOfItems; k++)
{
pIfInfo = pIfList->InterfaceInfo + k;
if (pIfInfo->isState == wlan_interface_state_connected)
{
w_win32_error = WlanQueryInterface(hClient,
&pIfInfo->InterfaceGuid,
wlan_intf_opcode_current_connection,
NULL,
&connectInfoSize,
(PVOID *)&pConnectInfo,
NULL);
if (w_win32_error != ERROR_SUCCESS) goto fail;
// printf("%s\n", pConnectInfo->wlanAssociationAttributes.dot11Ssid.ucSSID);
LIST_FOREACH(ssid, ssid_list, next)
{
len = strlen(ssid->str);
if (len==pConnectInfo->wlanAssociationAttributes.dot11Ssid.uSSIDLength && !memcmp(ssid->str,pConnectInfo->wlanAssociationAttributes.dot11Ssid.ucSSID,len))
{
WlanFreeMemory(pConnectInfo);
goto found;
}
}
WlanFreeMemory(pConnectInfo);
}
}
w_win32_error = 0;
fail:
bRes = false;
ex:
if (pIfList) WlanFreeMemory(pIfList);
if (hClient) WlanCloseHandle(hClient, 0);
return bRes;
found:
w_win32_error = 0;
bRes = true;
goto ex;
}
bool logical_net_filter_match(void)
{
return wlan_filter_match(wlan_filter_ssid) && nlm_filter_match(nlm_filter_net);
}
static bool logical_net_filter_match_rate_limited(void)
{
DWORD dwTick = GetTickCount() / 1000;
if (logical_net_filter_tick == dwTick) return true;
logical_net_filter_tick = dwTick;
return logical_net_filter_match();
}
static HANDLE windivert_init_filter(const char *filter, UINT64 flags)
{
LPSTR errormessage = NULL;
HANDLE h, hMutex;
const char *mutex_name = "Global\\winws_windivert_mutex";
// windivert driver start in windivert.dll has race conditions
hMutex = CreateMutexA(NULL,TRUE,mutex_name);
if (hMutex && GetLastError()==ERROR_ALREADY_EXISTS)
WaitForSingleObject(hMutex,INFINITE);
h = WinDivertOpen(filter, WINDIVERT_LAYER_NETWORK, 0, flags);
w_win32_error = GetLastError();
if (hMutex)
{
ReleaseMutex(hMutex);
CloseHandle(hMutex);
SetLastError(w_win32_error);
}
if (h != INVALID_HANDLE_VALUE) return h;
FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, w_win32_error, MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT), (LPSTR)&errormessage, 0, NULL);
DLOG_ERR("windivert: error opening filter: %s", errormessage);
LocalFree(errormessage);
if (w_win32_error == ERROR_INVALID_IMAGE_HASH)
DLOG_ERR("windivert: try to disable secure boot and install OS patches\n");
return NULL;
}
void rawsend_cleanup(void)
{
if (w_filter)
{
CancelIoEx(w_filter,&ovl);
WinDivertClose(w_filter);
w_filter=NULL;
}
if (ovl.hEvent)
{
CloseHandle(ovl.hEvent);
ovl.hEvent=NULL;
}
}
bool windivert_init(const char *filter)
{
rawsend_cleanup();
w_filter = windivert_init_filter(filter, 0);
if (w_filter)
{
ovl.hEvent = CreateEventW(NULL,FALSE,FALSE,NULL);
if (!ovl.hEvent)
{
w_win32_error = GetLastError();
rawsend_cleanup();
return false;
}
return true;
}
return false;
}
static bool windivert_recv_filter(HANDLE hFilter, uint8_t *packet, size_t *len, WINDIVERT_ADDRESS *wa)
{
UINT recv_len;
DWORD err;
DWORD rd;
char c;
if (bQuit)
{
errno=EINTR;
return false;
}
if (!logical_net_filter_match_rate_limited())
{
errno=ENODEV;
return false;
}
usleep(0);
if (WinDivertRecvEx(hFilter, packet, *len, &recv_len, 0, wa, NULL, &ovl))
{
*len = recv_len;
return true;
}
for(;;)
{
w_win32_error = GetLastError();
switch(w_win32_error)
{
case ERROR_IO_PENDING:
// make signals working
while (WaitForSingleObject(ovl.hEvent,50)==WAIT_TIMEOUT)
{
if (bQuit)
{
errno=EINTR;
return false;
}
if (!logical_net_filter_match_rate_limited())
{
errno=ENODEV;
return false;
}
usleep(0);
}
if (!GetOverlappedResult(hFilter,&ovl,&rd,TRUE))
continue;
*len = rd;
return true;
case ERROR_INSUFFICIENT_BUFFER:
errno = ENOBUFS;
break;
case ERROR_NO_DATA:
errno = ESHUTDOWN;
break;
default:
errno = EIO;
}
break;
}
return false;
}
bool windivert_recv(uint8_t *packet, size_t *len, WINDIVERT_ADDRESS *wa)
{
return windivert_recv_filter(w_filter,packet,len,wa);
}
static bool windivert_send_filter(HANDLE hFilter, const uint8_t *packet, size_t len, const WINDIVERT_ADDRESS *wa)
{
bool b = WinDivertSend(hFilter,packet,(UINT)len,NULL,wa);
w_win32_error = GetLastError();
return b;
}
bool windivert_send(const uint8_t *packet, size_t len, const WINDIVERT_ADDRESS *wa)
{
return windivert_send_filter(w_filter,packet,len,wa);
}
bool rawsend(const struct sockaddr* dst,uint32_t fwmark,const char *ifout,const void *data,size_t len)
{
WINDIVERT_ADDRESS wa;
memset(&wa,0,sizeof(wa));
// pseudo interface id IfIdx.SubIfIdx
if (sscanf(ifout,"%u.%u",&wa.Network.IfIdx,&wa.Network.SubIfIdx)!=2)
{
errno = EINVAL;
return false;
}
wa.Outbound=1;
wa.IPChecksum=1;
wa.TCPChecksum=1;
wa.UDPChecksum=1;
wa.IPv6 = (dst->sa_family==AF_INET6);
return windivert_send(data,len,&wa);
}
#else // *nix
static int rawsend_sock4=-1, rawsend_sock6=-1;
static bool b_bind_fix4=false, b_bind_fix6=false;
static void rawsend_clean_sock(int *sock)
{
if (sock && *sock!=-1)
{
close(*sock);
*sock=-1;
}
}
void rawsend_cleanup(void)
{
rawsend_clean_sock(&rawsend_sock4);
rawsend_clean_sock(&rawsend_sock6);
}
static int *rawsend_family_sock(sa_family_t family)
{
switch(family)
{
case AF_INET: return &rawsend_sock4;
case AF_INET6: return &rawsend_sock6;
default: return NULL;
}
}
#ifdef BSD
int socket_divert(sa_family_t family)
{
int fd;
#ifdef __FreeBSD__
// freebsd14+ way
// don't want to use ifdefs with os version to make binaries compatible with all versions
fd = socket(PF_DIVERT, SOCK_RAW, 0);
if (fd==-1 && (errno==EPROTONOSUPPORT || errno==EAFNOSUPPORT || errno==EPFNOSUPPORT))
#endif
// freebsd13- or openbsd way
fd = socket(family, SOCK_RAW, IPPROTO_DIVERT);
return fd;
}
static int rawsend_socket_divert(sa_family_t family)
{
// HACK HACK HACK HACK HACK HACK HACK HACK
// FreeBSD doesnt allow IP_HDRINCL for IPV6
// OpenBSD doesnt allow rawsending tcp frames
// we either have to go to the link layer (its hard, possible problems arise, compat testing, ...) or use some HACKING
// from my point of view disabling direct ability to send ip frames is not security. its SHIT
int fd = socket_divert(family);
if (fd!=-1 && !set_socket_buffers(fd,4096,RAW_SNDBUF))
{
close(fd);
return -1;
}
return fd;
}
static int rawsend_sendto_divert(sa_family_t family, int sock, const void *buf, size_t len)
{
struct sockaddr_storage sa;
socklen_t slen;
#ifdef __FreeBSD__
// since FreeBSD 14 it requires hardcoded ipv4 values, although can also send ipv6 frames
family = AF_INET;
slen = sizeof(struct sockaddr_in);
#else
// OpenBSD requires correct family and size
switch(family)
{
case AF_INET:
slen = sizeof(struct sockaddr_in);
break;
case AF_INET6:
slen = sizeof(struct sockaddr_in6);
break;
default:
return -1;
}
#endif
memset(&sa,0,slen);
sa.ss_family = family;
return sendto(sock, buf, len, 0, (struct sockaddr*)&sa, slen);
}
#endif
static int rawsend_socket_raw(int domain, int proto)
{
int fd = socket(domain, SOCK_RAW, proto);
if (fd!=-1)
{
#ifdef __linux__
int s=RAW_SNDBUF/2;
int r=2048;
#else
int s=RAW_SNDBUF;
int r=4096;
#endif
if (!set_socket_buffers(fd,r,s))
{
close(fd);
return -1;
}
}
return fd;
}
static bool set_socket_fwmark(int sock, uint32_t fwmark)
{
#ifdef BSD
#ifdef SO_USER_COOKIE
if (setsockopt(sock, SOL_SOCKET, SO_USER_COOKIE, &fwmark, sizeof(fwmark)) == -1)
{
DLOG_PERROR("rawsend: setsockopt(SO_USER_COOKIE)");
return false;
}
#endif
#elif defined(__linux__)
if (setsockopt(sock, SOL_SOCKET, SO_MARK, &fwmark, sizeof(fwmark)) == -1)
{
DLOG_PERROR("rawsend: setsockopt(SO_MARK)");
return false;
}
#endif
return true;
}
static int rawsend_socket(sa_family_t family)
{
int *sock = rawsend_family_sock(family);
if (!sock) return -1;
if (*sock==-1)
{
int yes=1,pri=6;
//printf("rawsend_socket: family %d",family);
#ifdef __FreeBSD__
// IPPROTO_RAW with ipv6 in FreeBSD always returns EACCES on sendto.
// must use IPPROTO_TCP for ipv6. IPPROTO_RAW works for ipv4
// divert sockets are always v4 but accept both v4 and v6
*sock = rawsend_socket_divert(AF_INET);
#elif defined(__OpenBSD__) || defined (__APPLE__)
// OpenBSD does not allow sending TCP frames through raw sockets
// I dont know about macos. They have dropped ipfw in recent versions and their PF does not support divert-packet
*sock = rawsend_socket_divert(family);
#else
*sock = rawsend_socket_raw(family, IPPROTO_RAW);
#endif
if (*sock==-1)
{
DLOG_PERROR("rawsend: socket()");
return -1;
}
#ifdef __linux__
if (setsockopt(*sock, SOL_SOCKET, SO_PRIORITY, &pri, sizeof(pri)) == -1)
{
DLOG_PERROR("rawsend: setsockopt(SO_PRIORITY)");
goto exiterr;
}
if (family==AF_INET && setsockopt(*sock, IPPROTO_IP, IP_NODEFRAG, &yes, sizeof(yes)) == -1)
{
DLOG_PERROR("rawsend: setsockopt(IP_NODEFRAG)");
goto exiterr;
}
if (family==AF_INET && setsockopt(*sock, IPPROTO_IP, IP_FREEBIND, &yes, sizeof(yes)) == -1)
{
DLOG_PERROR("rawsend: setsockopt(IP_FREEBIND)");
goto exiterr;
}
if (family==AF_INET6 && setsockopt(*sock, SOL_IPV6, IPV6_FREEBIND, &yes, sizeof(yes)) == -1)
{
//DLOG_PERROR("rawsend: setsockopt(IPV6_FREEBIND)");
// dont error because it's supported only from kernel 4.15
}
#endif
}
return *sock;
exiterr:
rawsend_clean_sock(sock);
return -1;
}
bool rawsend_preinit(bool bind_fix4, bool bind_fix6)
{
b_bind_fix4 = bind_fix4;
b_bind_fix6 = bind_fix6;
// allow ipv6 disabled systems
return rawsend_socket(AF_INET)!=-1 && (rawsend_socket(AF_INET6)!=-1 || errno==EAFNOSUPPORT);
}
bool rawsend(const struct sockaddr* dst,uint32_t fwmark,const char *ifout,const void *data,size_t len)
{
ssize_t bytes;
int sock=rawsend_socket(dst->sa_family);
if (sock==-1) return false;
if (!set_socket_fwmark(sock,fwmark)) return false;
int salen = dst->sa_family == AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
struct sockaddr_storage dst2;
memcpy(&dst2,dst,salen);
if (dst->sa_family==AF_INET6)
((struct sockaddr_in6 *)&dst2)->sin6_port = 0; // or will be EINVAL in linux
#if defined(BSD)
bytes = rawsend_sendto_divert(dst->sa_family,sock,data,len);
if (bytes==-1)
{
DLOG_PERROR("rawsend: sendto_divert");
return false;
}
return true;
#else
#ifdef __linux__
struct sockaddr_storage sa_src;
switch(dst->sa_family)
{
case AF_INET:
if (!b_bind_fix4) goto nofix;
extract_endpoints(data,NULL,NULL,NULL, &sa_src, NULL);
break;
case AF_INET6:
if (!b_bind_fix6) goto nofix;
extract_endpoints(NULL,data,NULL,NULL, &sa_src, NULL);
break;
default:
return false; // should not happen
}
//printf("family %u dev %s bind : ", dst->sa_family, ifout); print_sockaddr((struct sockaddr *)&sa_src); printf("\n");
if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifout, ifout ? strlen(ifout)+1 : 0) == -1)
{
DLOG_PERROR("rawsend: setsockopt(SO_BINDTODEVICE)");
return false;
}
if (bind(sock, (const struct sockaddr*)&sa_src, dst->sa_family==AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6)))
{
DLOG_PERROR("rawsend: bind (ignoring)");
// do not fail. this can happen regardless of IP_FREEBIND
// rebind to any address
memset(&sa_src,0,sizeof(sa_src));
sa_src.ss_family = dst->sa_family;
if (bind(sock, (const struct sockaddr*)&sa_src, dst->sa_family==AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6)))
{
DLOG_PERROR("rawsend: bind to any");
return false;
}
}
nofix:
#endif
// normal raw socket sendto
bytes = sendto(sock, data, len, 0, (struct sockaddr*)&dst2, salen);
if (bytes==-1)
{
DLOG_PERROR("rawsend: sendto");
return false;
}
return true;
#endif
}
#endif // not CYGWIN
bool rawsend_rp(const struct rawpacket *rp)
{
return rawsend((struct sockaddr*)&rp->dst,rp->fwmark,rp->ifout,rp->packet,rp->len);
}
bool rawsend_queue(struct rawpacket_tailhead *q)
{
struct rawpacket *rp;
bool b;
for (b=true; (rp=rawpacket_dequeue(q)) ; rawpacket_free(rp))
b &= rawsend_rp(rp);
return b;
}
// return guessed fake ttl value. 0 means unsuccessfull, should not perform autottl fooling
// ttl = TTL of incoming packet
uint8_t autottl_guess(uint8_t ttl, const autottl *attl)
{
uint8_t orig, path, fake;
// 18.65.168.125 ( cloudfront ) 255
// 157.254.246.178 128
// 1.1.1.1 64
// guess original ttl. consider path lengths less than 32 hops
if (ttl>223)
orig=255;
else if (ttl<128 && ttl>96)
orig=128;
else if (ttl<64 && ttl>32)
orig=64;
else
return 0;
path = orig - ttl;
fake = path > attl->delta ? path - attl->delta : attl->min;
if (fake<attl->min) fake=attl->min;
else if (fake>attl->max) fake=attl->max;
if (fake>=path) return 0;
return fake;
}
void do_nat(bool bOutbound, struct ip *ip, struct ip6_hdr *ip6, struct tcphdr *tcphdr, struct udphdr *udphdr, const struct sockaddr_in *target4, const struct sockaddr_in6 *target6)
{
uint16_t nport;
if (ip && target4)
{
nport = target4->sin_port;
if (bOutbound)
ip->ip_dst = target4->sin_addr;
else
ip->ip_src = target4->sin_addr;
ip4_fix_checksum(ip);
}
else if (ip6 && target6)
{
nport = target6->sin6_port;
if (bOutbound)
ip6->ip6_dst = target6->sin6_addr;
else
ip6->ip6_src = target6->sin6_addr;
}
else
return;
if (nport)
{
if (tcphdr)
{
if (bOutbound)
tcphdr->th_dport = nport;
else
tcphdr->th_sport = nport;
}
if (udphdr)
{
if (bOutbound)
udphdr->uh_dport = nport;
else
udphdr->uh_sport = nport;
}
}
}
void verdict_tcp_csum_fix(uint8_t verdict, struct tcphdr *tcphdr, size_t transport_len, struct ip *ip, struct ip6_hdr *ip6hdr)
{
if (!(verdict & VERDICT_NOCSUM))
{
// always fix csum for windivert. original can be partial or bad
#ifndef __CYGWIN__
#ifdef __FreeBSD__
// FreeBSD tend to pass ipv6 frames with wrong checksum
if ((verdict & VERDICT_MASK)==VERDICT_MODIFY || ip6hdr)
#else
// if original packet was tampered earlier it needs checksum fixed
if ((verdict & VERDICT_MASK)==VERDICT_MODIFY)
#endif
#endif
tcp_fix_checksum(tcphdr,transport_len,ip,ip6hdr);
}
}
void verdict_udp_csum_fix(uint8_t verdict, struct udphdr *udphdr, size_t transport_len, struct ip *ip, struct ip6_hdr *ip6hdr)
{
if (!(verdict & VERDICT_NOCSUM))
{
// always fix csum for windivert. original can be partial or bad
#ifndef __CYGWIN__
#ifdef __FreeBSD__
// FreeBSD tend to pass ipv6 frames with wrong checksum
if ((verdict & VERDICT_MASK)==VERDICT_MODIFY || ip6hdr)
#else
// if original packet was tampered earlier it needs checksum fixed
if ((verdict & VERDICT_MASK)==VERDICT_MODIFY)
#endif
#endif
udp_fix_checksum(udphdr,transport_len,ip,ip6hdr);
}
}
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