0.2.3rc2 version

This option is similar to fake-from-hex, but generates number of
packets with random payload.

README.md

@@ -64,6 +64,13 @@ Usage: goodbyedpi.exe [OPTION...]
  --reverse-frag           fragment (split) the packets just as --native-frag, but send them in the
                           reversed order. Works with the websites which could not handle segmented
                           HTTPS TLS ClientHello (because they receive the TCP flow "combined").
+ --fake-from-hex <value>  Load fake packets for Fake Request Mode from HEX values (like 1234abcDEF).
+                          This option can be supplied multiple times, in this case each fake packet
+                          would be sent on every request in the command line argument order.
+ --fake-gen <value>       Generate random-filled fake packets for Fake Request Mode, value of them
+                          (up to 30).
+ --fake-resend <value>    Send each fake packet value number of times.
+                          Default: 1 (send each packet once).
  --max-payload [value]    packets with TCP payload data more than [value] won't be processed.
                           Use this option to reduce CPU usage by skipping huge amount of data
                           (like file transfers) in already established sessions.

src/fakepackets.c

@@ -1,5 +1,7 @@
 #include <stdio.h>
+#define _CRT_RAND_S
 #include <stdlib.h>
+#include <stdbool.h>
 #include <ctype.h>
 #include <unistd.h>
 #include <in6addr.h>
@@ -7,6 +9,15 @@
 #include "windivert.h"
 #include "goodbyedpi.h"
 
+struct fake_t {
+    const unsigned char* data;
+    size_t size;
+};
+
+static struct fake_t *fakes[30] = {0};
+int fakes_count = 0;
+int fakes_resend = 1;
+
 static const unsigned char fake_http_request[] = "GET / HTTP/1.1\r\nHost: www.w3.org\r\n"
                                                  "User-Agent: curl/7.65.3\r\nAccept: */*\r\n"
                                                  "Accept-Encoding: deflate, gzip, br\r\n\r\n";
@@ -54,7 +65,8 @@ static int send_fake_data(const HANDLE w_filter,
                           const BOOL is_https,
                           const BYTE set_ttl,
                           const BYTE set_checksum,
-                          const BYTE set_seq
+                          const BYTE set_seq,
+                          const struct fake_t *fake_data
                          ) {
     char packet_fake[MAX_PACKET_SIZE];
     WINDIVERT_ADDRESS addr_new;
@@ -66,6 +78,10 @@ static int send_fake_data(const HANDLE w_filter,
     PWINDIVERT_TCPHDR ppTcpHdr;
     unsigned const char *fake_request_data = is_https ? fake_https_request : fake_http_request;
     UINT fake_request_size = is_https ? sizeof(fake_https_request) : sizeof(fake_http_request) - 1;
+    if (fake_data) {
+        fake_request_data = fake_data->data;
+        fake_request_size = fake_data->size;
+    }
 
     memcpy(&addr_new, addr, sizeof(WINDIVERT_ADDRESS));
     memcpy(packet_fake, pkt, packetLen);
@@ -148,22 +164,26 @@ static int send_fake_request(const HANDLE w_filter,
                                   const BOOL is_https,
                                   const BYTE set_ttl,
                                   const BYTE set_checksum,
-                                  const BYTE set_seq
+                                  const BYTE set_seq,
+                                  const struct fake_t *fake_data
                                  ) {
     if (set_ttl) {
         send_fake_data(w_filter, addr, pkt, packetLen,
                           is_ipv6, is_https,
-                          set_ttl, FALSE, FALSE);
+                          set_ttl, FALSE, FALSE,
+                          fake_data);
     }
     if (set_checksum) {
         send_fake_data(w_filter, addr, pkt, packetLen,
                           is_ipv6, is_https,
-                          FALSE, set_checksum, FALSE);
+                          FALSE, set_checksum, FALSE,
+                          fake_data);
     }
     if (set_seq) {
         send_fake_data(w_filter, addr, pkt, packetLen,
                           is_ipv6, is_https,
-                          FALSE, FALSE, set_seq);
+                          FALSE, FALSE, set_seq,
+                          fake_data);
     }
     return 0;
 }
@@ -177,9 +197,18 @@ int send_fake_http_request(const HANDLE w_filter,
                                   const BYTE set_checksum,
                                   const BYTE set_seq
                                  ) {
-    return send_fake_request(w_filter, addr, pkt, packetLen,
+    int ret = 0;
-                          is_ipv6, FALSE,
+    for (int i=0; i<fakes_count || i == 0; i++) {
-                          set_ttl, set_checksum, set_seq);
+        for (int j=0; j<fakes_resend; j++)
+            if (send_fake_request(w_filter, addr, pkt, packetLen,
+                            is_ipv6, FALSE,
+                            set_ttl, set_checksum, set_seq,
+                            fakes[i]))
+            {
+                ret++;
+            }
+    }
+    return ret;
 }
 
 int send_fake_https_request(const HANDLE w_filter,
@@ -191,7 +220,94 @@ int send_fake_https_request(const HANDLE w_filter,
                                    const BYTE set_checksum,
                                    const BYTE set_seq
                                  ) {
-    return send_fake_request(w_filter, addr, pkt, packetLen,
+    int ret = 0;
+    for (int i=0; i<fakes_count || i == 0; i++) {
+        for (int j=0; j<fakes_resend; j++)
+            if (send_fake_request(w_filter, addr, pkt, packetLen,
                           is_ipv6, TRUE,
-                          set_ttl, set_checksum, set_seq);
+                          set_ttl, set_checksum, set_seq,
+                          fakes[i]))
+            {
+                ret++;
+            }
+    }
+    return ret;
+}
+
+static int fake_add(const unsigned char *data, size_t size) {
+    struct fake_t *fake = malloc(sizeof(struct fake_t));
+    fake->size = size;
+    fake->data = data;
+
+    for (size_t k = 0; k <= sizeof(fakes) / sizeof(*fakes); k++) {
+        if (!fakes[k]) {
+            fakes[k] = fake;
+            fakes_count++;
+            return 0;
+        }
+    }
+    return 3;
+}
+
+int fake_load_from_hex(const char *data) {
+    size_t len = strlen(data);
+    if (len < 2 || len % 2 || len > 1420)
+        return 1;
+
+    unsigned char *finaldata = calloc((len + 2) / 2, 1);
+
+    for (size_t i = 0; i<len - 1; i+=2) {
+        char num1 = data[i];
+        char num2 = data[i+1];
+        debug("Current num1: %X, num2: %X\n", num1, num2);
+        unsigned char finalchar = 0;
+        char curchar = num1;
+
+        for (int j=0; j<=1; j++) {
+            if (curchar >= '0' && curchar <= '9')
+                curchar -= '0';
+            else if (curchar >= 'a' && curchar <= 'f')
+                curchar -= 'a' - 0xA;
+            else if (curchar >= 'A' && curchar <= 'F')
+                curchar -= 'A' - 0xA;
+            else
+                return 2; // incorrect character, not a hex data
+
+            if (!j) {
+                num1 = curchar;
+                curchar = num2;
+                continue;
+            }
+            num2 = curchar;
+        }
+        debug("Processed num1: %X, num2: %X\n", num1, num2);
+        finalchar = (num1 << 4) | num2;
+        debug("Final char: %X\n", finalchar);
+        finaldata[i/2] = finalchar;
+    }
+
+    return fake_add(finaldata, len / 2);
+}
+
+int fake_load_random(unsigned int count, unsigned int maxsize) {
+    if (count < 1 || count > sizeof(fakes) / sizeof(*fakes))
+        return 1;
+
+    unsigned int random = 0;
+
+    for (unsigned int i=0; i<count; i++) {
+        unsigned int len = 0;
+        if (rand_s(&len))
+            return 1;
+        len = 8 + (len % maxsize);
+
+        unsigned char *data = calloc(len, 1);
+        for (unsigned int j=0; j<len; j++) {
+            rand_s(&random);
+            data[j] = random % 0xFF;
+        }
+        if (fake_add(data, len))
+            return 2;
+    }
+    return 0;
 }

src/fakepackets.h

@@ -1,3 +1,5 @@
+extern int fakes_count;
+extern int fakes_resend;
 int send_fake_http_request(const HANDLE w_filter,
                                   const PWINDIVERT_ADDRESS addr,
                                   const char *pkt,

src/goodbyedpi.c

@@ -24,7 +24,7 @@
 // My mingw installation does not load inet_pton definition for some reason
 WINSOCK_API_LINKAGE INT WSAAPI inet_pton(INT Family, LPCSTR pStringBuf, PVOID pAddr);
 
-#define GOODBYEDPI_VERSION "v0.2.3"
+#define GOODBYEDPI_VERSION "v0.2.3rc2"
 
 #define die() do { sleep(20); exit(EXIT_FAILURE); } while (0)
 
@@ -188,6 +188,9 @@ static struct option long_options[] = {
     {"native-frag", no_argument,       0,  '*' },
     {"reverse-frag",no_argument,       0,  '(' },
     {"max-payload", optional_argument, 0,  '|' },
+    {"fake-from-hex", required_argument, 0,  'u' },
+    {"fake-gen",    required_argument, 0,  'j' },
+    {"fake-resend", required_argument, 0,  't' },
     {"debug-exit",  optional_argument, 0,  'x' },
     {0,             0,                 0,   0  }
 };
@@ -940,6 +943,25 @@ int main(int argc, char *argv[]) {
                 else
                     max_payload_size = 1200;
                 break;
+            case 'u': // --fake-from-hex
+                if (fake_load_from_hex(optarg)) {
+                    printf("WARNING: bad fake HEX value %s\n", optarg);
+                }
+                break;
+            case 'j': // --fake-gen
+                if (fake_load_random(atoub(optarg, "Fake generator parameter error!"))) {
+                    puts("WARNING: fake generator has failed!");
+                }
+                break;
+            case 't': // --fake-resend
+                fakes_resend = atoub(optarg, "Fake resend parameter error!");
+                if (fakes_resend == 1)
+                    puts("WARNING: fake-resend is 1, no resending is in place!");
+                else if (!fakes_resend)
+                    puts("WARNING: fake-resend is 0, fake packet mode is disabled!");
+                else if (fakes_resend > 100)
+                    puts("WARNING: fake-resend value is a little too high, don't you think?");
+                break;
             case 'x': // --debug-exit
                 debug_exit = true;
                 break;
@@ -988,6 +1010,13 @@ int main(int argc, char *argv[]) {
                 " --reverse-frag           fragment (split) the packets just as --native-frag, but send them in the\n"
                 "                          reversed order. Works with the websites which could not handle segmented\n"
                 "                          HTTPS TLS ClientHello (because they receive the TCP flow \"combined\").\n"
+                " --fake-from-hex <value>  Load fake packets for Fake Request Mode from HEX values (like 1234abcDEF).\n"
+                "                          This option can be supplied multiple times, in this case each fake packet\n"
+                "                          would be sent on every request in the command line argument order.\n"
+                " --fake-gen <value>       Generate random-filled fake packets for Fake Request Mode, value of them\n"
+                "                          (up to 30).\n"
+                " --fake-resend <value>    Send each fake packet value number of times.\n"
+                "                          Default: 1 (send each packet once).\n"
                 " --max-payload [value]    packets with TCP payload data more than [value] won't be processed.\n"
                 "                          Use this option to reduce CPU usage by skipping huge amount of data\n"
                 "                          (like file transfers) in already established sessions.\n"
@@ -1047,7 +1076,9 @@ int main(int argc, char *argv[]) {
            "Fake requests, TTL: %s (fixed: %hu, auto: %hu-%hu-%hu, min distance: %hu)\n"  /* 17 */
            "Fake requests, wrong checksum: %d\n"    /* 18 */
            "Fake requests, wrong SEQ/ACK: %d\n"     /* 19 */
-           "Max payload size: %hu\n",               /* 20 */
+           "Fake requests, custom payloads: %d\n"   /* 20 */
+           "Fake requests, resend: %d\n"            /* 21 */
+           "Max payload size: %hu\n",               /* 22 */
            do_passivedpi, do_block_quic,                          /* 1 */
            (do_fragment_http ? http_fragment_size : 0),           /* 2 */
            (do_fragment_http_persistent ? http_fragment_size : 0),/* 3 */
@@ -1069,7 +1100,9 @@ int main(int argc, char *argv[]) {
                do_auto_ttl ? auto_ttl_max : 0, ttl_min_nhops,
            do_wrong_chksum, /* 18 */
            do_wrong_seq,    /* 19 */
-           max_payload_size /* 20 */
+           fakes_count,     /* 20 */
+           fakes_resend,    /* 21 */
+           max_payload_size /* 22 */
           );
 
     if (do_fragment_http && http_fragment_size > 2 && !do_native_frag) {