history purge

nfq/darkmagic.h

@@ -0,0 +1,76 @@
+#pragma once
+
+#include "checksum.h"
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <netinet/ip.h>
+#include <netinet/ip6.h>
+#include <netinet/tcp.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+// returns netorder value
+uint32_t net32_add(uint32_t netorder_value, uint32_t cpuorder_increment);
+
+#define TCP_FOOL_NONE	0
+#define TCP_FOOL_MD5SIG	1
+#define TCP_FOOL_BADSUM	2
+#define TCP_FOOL_TS	4
+#define TCP_FOOL_BADSEQ	8
+
+// seq and wsize have network byte order
+bool prepare_tcp_segment4(
+	const struct sockaddr_in *src, const struct sockaddr_in *dst,
+	uint8_t tcp_flags,
+	uint32_t seq, uint32_t ack_seq,
+	uint16_t wsize,
+	uint32_t *timestamps,
+	uint8_t ttl,
+	uint8_t fooling,
+	const void *data, uint16_t len,
+	uint8_t *buf, size_t *buflen);
+bool prepare_tcp_segment6(
+	const struct sockaddr_in6 *src, const struct sockaddr_in6 *dst,
+	uint8_t tcp_flags,
+	uint32_t seq, uint32_t ack_seq,
+	uint16_t wsize,
+	uint32_t *timestamps,
+	uint8_t ttl,
+	uint8_t fooling,
+	const void *data, uint16_t len,
+	uint8_t *buf, size_t *buflen);
+bool prepare_tcp_segment(
+	const struct sockaddr *src, const struct sockaddr *dst,
+	uint8_t tcp_flags,
+	uint32_t seq, uint32_t ack_seq,
+	uint16_t wsize,
+	uint32_t *timestamps,
+	uint8_t ttl,
+	uint8_t fooling,
+	const void *data, uint16_t len,
+	uint8_t *buf, size_t *buflen);
+
+void extract_endpoints(const struct ip *ip,const struct ip6_hdr *ip6hdr,const struct tcphdr *tcphdr, struct sockaddr_storage *src, struct sockaddr_storage *dst);
+uint8_t *tcp_find_option(struct tcphdr *tcp, uint8_t kind);
+uint32_t *tcp_find_timestamps(struct tcphdr *tcp);
+
+// auto creates internal socket and uses it for subsequent calls
+bool rawsend(const struct sockaddr* dst,uint32_t fwmark,const void *data,size_t len);
+// should pre-do it if dropping privileges. otherwise its not necessary
+bool rawsend_preinit(uint32_t fwmark);
+// cleans up socket autocreated by rawsend
+void rawsend_cleanup();
+
+void print_ip(const struct ip *ip);
+void print_ip6hdr(const struct ip6_hdr *ip6hdr, uint8_t proto);
+void print_tcphdr(const struct tcphdr *tcphdr);
+
+
+bool proto_check_ipv4(uint8_t *data, size_t len);
+void proto_skip_ipv4(uint8_t **data, size_t *len);
+bool proto_check_tcp(uint8_t *data, size_t len);
+void proto_skip_tcp(uint8_t **data, size_t *len);
+bool proto_check_ipv6(uint8_t *data, size_t len);
+void proto_skip_ipv6(uint8_t **data, size_t *len, uint8_t *proto_type);
+bool tcp_synack_segment(const struct tcphdr *tcphdr);