alienrobotarmy / ctunnel Goto Github PK

For example, if I use /25 cidr, i got 255.255.255.129 instead if 128. Because compute is done on 255 power instead of 256, evident after you have the nose on it :)

net.c
pow = 256 * pow (instead of 255)
msk = 256 - ... (instead of 255)

With the new version you cannot build becouse are not allowed to see inside internals structures in openssl >= 1.1.0, you can see: openssl/openssl#962

On crypto.c in function *openssl_crypto_init

#if OPENSSL_VERSION_NUMBER < 0x10100000L
    crypto_ctx *ctx = calloc(1, sizeof (crypto_ctx));
#else
    crypto_ctx *ctx = EVP_CIPHER_CTX_new();
#endif

Or with a patch diff

diff --git a/src/crypto.c b/src/crypto.c
index 951787a..1e2a20c 100644
--- a/src/crypto.c
+++ b/src/crypto.c
@@ -16,25 +16,26 @@
 #include <errno.h>
 #include <openssl/opensslv.h>
 
+
 #include "ctunnel.h"
 
 #ifdef HAVE_OPENSSL
 
-
-crypto_ctx *openssl_crypto_init(struct options opt, int dir)
-{
-    //HMAC_CTX *hm_ctx= HMAC_CTX_new();
-    //crypto_ctx *ctx = calloc(1, sizeof(crypto_ctx));
-    crypto_ctx *ctx =  EVP_CIPHER_CTX_new();
+crypto_ctx *openssl_crypto_init(struct options opt, int dir) {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+    crypto_ctx *ctx = calloc(1, sizeof (crypto_ctx));
+#else
+    crypto_ctx *ctx = EVP_CIPHER_CTX_new();
+#endif
 
     if (opt.proxy == 0) {
 
-    /* STREAM CIPHERS ONLY */
-    EVP_CIPHER_CTX_init(ctx);
-    EVP_CipherInit_ex(ctx, opt.key.cipher, NULL,
-                       opt.key.key, opt.key.iv, dir);
-    /* Encrypt final for UDP? */
-    EVP_CIPHER_CTX_set_padding(ctx, 1);
+        /* STREAM CIPHERS ONLY */
+        EVP_CIPHER_CTX_init(ctx);
+        EVP_CipherInit_ex(ctx, opt.key.cipher, NULL,
+                opt.key.key, opt.key.iv, dir);
+        /* Encrypt final for UDP? */
+        EVP_CIPHER_CTX_set_padding(ctx, 1);
     }
 
     return ctx;
@@ -52,7 +53,11 @@ void openssl_crypto_reset(crypto_ctx *ctx, struct options opt, int dir)
 void openssl_crypto_deinit(crypto_ctx *ctx)
 {
     EVP_CIPHER_CTX_cleanup(ctx);
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+    free(ctx);
+#else
     EVP_CIPHER_CTX_free(ctx);
+#endif
 }
 struct Packet openssl_do_encrypt(crypto_ctx *ctx, unsigned char *intext,
                                 int size)
@@ -140,4 +145,4 @@ struct Packet gcrypt_do_decrypt(crypto_ctx ctx, unsigned char *intext,
 
     return crypto;
 }
-#endif
+#endif 
\ No newline at end of file

Hey, what is Linux and this MAKE stuff?

Why can't i just run setup.exe and make it work?

Does this ctunnel actually do anything for Windows?

:)

example1:
./ctunnel -V -c -n -C rc4
ctunnel 0.7 Copyright (C) 2008-2014 Jess Mahan
Enter Key [16 Characters]: 1234567891234567
Enter IV [16 Characters]: 1234567891234567
[ctunnel] ctunnel 0.7 starting
[ctunnel] TCP [OpenSSL] VPN using rc4
Segmentation fault

example2:
./ctunnel -V -f 127.0.0.1:8889 -c -t 2 -n -C plain
ctunnel 0.7 Copyright (C) 2008-2014 Jess Mahan
[ctunnel] ctunnel 0.7 starting
Segmentation fault (core dumped)

example3:
./ctunnel -V -l 127.0.0.1:8889 -c -t 2 -n -C rc4
ctunnel 0.7 Copyright (C) 2008-2014 Jess Mahan
[ctunnel] ctunnel 0.7 starting
[ctunnel] TCP [OpenSSL] VPN using rc4
Segmentation fault (core dumped)

coredump.tar.gz

1. the version info is not updated ,still 0.7
2. client option always crash with " -C plain" option

./ctunnel -V -f 127.0.0.1:8889 -c -t 2 -n -C plain bad
./ctunnel -V -f 127.0.0.1:8889 -c -t 2 -n -C cr4 good

4. sometimes client is not conected with server , crashed (not sure)

5. -c option with -l (not -f) crashed

"ctuunel also is a plain tunnel" But I dont find the option to disable the cryptographic.

I want to use the ctuunel VPN fuction to forward my encryption content and dont want it to be encrypted twice.

Do you have any idea ? Thanks.

Hello sir
I'm trying to use ctunnel but its not working for me can you kindly help me

Server
ctunnel -H 127.0.0.1 -s -l 2222 -f 2221 -C aes-256-cfb
ctunnel 0.7 Copyright (C) 2008-2014 Jess Mahan
Must specify hostname:port

ctunnel -l localhost:22:aes-128-cfb -f 10.0.0.1:22:rc4 -s
ctunnel 0.7 Copyright (C) 2008-2014 Jess Mahan
Enter Key [16 Characters]:

cannot run it.Please help

Is ctunnel compatible with IPv6?
Trying to proxy with ctunnel to an IPv6 host, but ctunnel is not binding to IPv6, instead it is listening on 255.255.255.255.
What is the syntax to use IPv6?
[IPv6-ip]:port

Hi
I was trying to use VPN mode in the manner of multiple clients connect to one server. They all get connected. I can ping the server from all the clients but the server cannot ping all clients. In detail, the server can only ping one server a time and that server is dynamically changed. For example, for a few seconds, client A is accessible from server, after that it changes to Client B and etc ..
What is the problem? How it can be fixed?
Thanks

/usr/bin/ld: log.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: multiple definition of threads'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: first defined here /usr/bin/ld: log.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: multiple definition of mutex'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: first defined here
/usr/bin/ld: net.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: multiple definition of do_encrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: first defined here /usr/bin/ld: net.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: multiple definition of do_decrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: first defined here
/usr/bin/ld: net.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: multiple definition of crypto_init'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: first defined here /usr/bin/ld: net.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: multiple definition of crypto_deinit'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: first defined here
/usr/bin/ld: net.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: multiple definition of crypto_reset'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: first defined here /usr/bin/ld: net.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: multiple definition of clients'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: first defined here
/usr/bin/ld: net.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: multiple definition of hosts'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: first defined here /usr/bin/ld: net.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: multiple definition of threads'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: first defined here
/usr/bin/ld: net.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: multiple definition of mutex'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: first defined here /usr/bin/ld: opt.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: multiple definition of crypto_reset'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: first defined here
/usr/bin/ld: opt.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: multiple definition of crypto_deinit'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: first defined here /usr/bin/ld: opt.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: multiple definition of crypto_init'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: first defined here
/usr/bin/ld: opt.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: multiple definition of do_decrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: first defined here /usr/bin/ld: opt.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: multiple definition of do_encrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: first defined here
/usr/bin/ld: opt.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: multiple definition of clients'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: first defined here /usr/bin/ld: opt.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: multiple definition of hosts'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: first defined here
/usr/bin/ld: opt.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: multiple definition of threads'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: first defined here /usr/bin/ld: opt.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: multiple definition of mutex'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: first defined here
/usr/bin/ld: stats.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: multiple definition of crypto_reset'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: first defined here /usr/bin/ld: stats.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: multiple definition of crypto_deinit'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: first defined here
/usr/bin/ld: stats.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: multiple definition of crypto_init'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: first defined here /usr/bin/ld: stats.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: multiple definition of do_decrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: first defined here
/usr/bin/ld: stats.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: multiple definition of do_encrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: first defined here /usr/bin/ld: stats.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: multiple definition of clients'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: first defined here
/usr/bin/ld: stats.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: multiple definition of hosts'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: first defined here /usr/bin/ld: stats.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: multiple definition of threads'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: first defined here
/usr/bin/ld: stats.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: multiple definition of mutex'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: first defined here /usr/bin/ld: tun.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: multiple definition of hosts'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: first defined here
/usr/bin/ld: tun.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: multiple definition of crypto_reset'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: first defined here /usr/bin/ld: tun.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: multiple definition of crypto_deinit'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: first defined here
/usr/bin/ld: tun.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: multiple definition of crypto_init'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: first defined here /usr/bin/ld: tun.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: multiple definition of do_decrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: first defined here
/usr/bin/ld: tun.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: multiple definition of do_encrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: first defined here /usr/bin/ld: tun.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: multiple definition of clients'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: first defined here
/usr/bin/ld: tun.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: multiple definition of threads'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: first defined here /usr/bin/ld: tun.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: multiple definition of mutex'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: first defined here
/usr/bin/ld: tunnel_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: multiple definition of threads'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: first defined here /usr/bin/ld: tunnel_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: multiple definition of mutex'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: first defined here
/usr/bin/ld: tunnel_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: multiple definition of crypto_reset'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: first defined here /usr/bin/ld: tunnel_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: multiple definition of crypto_deinit'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: first defined here
/usr/bin/ld: tunnel_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: multiple definition of crypto_init'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: first defined here /usr/bin/ld: tunnel_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: multiple definition of do_decrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: first defined here
/usr/bin/ld: tunnel_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: multiple definition of do_encrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: first defined here /usr/bin/ld: tunnel_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: multiple definition of clients'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: first defined here
/usr/bin/ld: tunnel_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: multiple definition of hosts'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: first defined here /usr/bin/ld: tunnel_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: multiple definition of do_encrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: first defined here
/usr/bin/ld: tunnel_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: multiple definition of do_decrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: first defined here /usr/bin/ld: tunnel_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: multiple definition of crypto_init'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: first defined here
/usr/bin/ld: tunnel_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: multiple definition of crypto_deinit'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: first defined here /usr/bin/ld: tunnel_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: multiple definition of mutex'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: first defined here
/usr/bin/ld: tunnel_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: multiple definition of threads'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: first defined here /usr/bin/ld: tunnel_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: multiple definition of crypto_reset'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: first defined here
/usr/bin/ld: tunnel_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: multiple definition of clients'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: first defined here /usr/bin/ld: tunnel_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: multiple definition of hosts'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: first defined here
/usr/bin/ld: vpn_handshake.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: multiple definition of crypto_init'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: first defined here /usr/bin/ld: vpn_handshake.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: multiple definition of crypto_deinit'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: first defined here
/usr/bin/ld: vpn_handshake.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: multiple definition of do_decrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: first defined here /usr/bin/ld: vpn_handshake.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: multiple definition of do_encrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: first defined here
/usr/bin/ld: vpn_handshake.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: multiple definition of hosts'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: first defined here /usr/bin/ld: vpn_handshake.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: multiple definition of clients'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: first defined here
/usr/bin/ld: vpn_handshake.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: multiple definition of crypto_reset'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: first defined here /usr/bin/ld: vpn_handshake.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: multiple definition of threads'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: first defined here
/usr/bin/ld: vpn_handshake.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: multiple definition of mutex'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: first defined here /usr/bin/ld: vpn_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: multiple definition of mutex'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: first defined here
/usr/bin/ld: vpn_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: multiple definition of threads'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: first defined here /usr/bin/ld: vpn_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: multiple definition of crypto_init'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: first defined here
/usr/bin/ld: vpn_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: multiple definition of crypto_deinit'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: first defined here /usr/bin/ld: vpn_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: multiple definition of hosts'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: first defined here
/usr/bin/ld: vpn_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: multiple definition of clients'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: first defined here /usr/bin/ld: vpn_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: multiple definition of crypto_reset'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: first defined here
/usr/bin/ld: vpn_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: multiple definition of do_decrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: first defined here /usr/bin/ld: vpn_loop.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: multiple definition of do_encrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: first defined here
/usr/bin/ld: vpn_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: multiple definition of hosts'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:229: first defined here /usr/bin/ld: vpn_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: multiple definition of do_encrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:233: first defined here
/usr/bin/ld: vpn_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: multiple definition of do_decrypt'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:234: first defined here /usr/bin/ld: vpn_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: multiple definition of crypto_init'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:235: first defined here
/usr/bin/ld: vpn_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: multiple definition of crypto_deinit'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:236: first defined here /usr/bin/ld: vpn_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: multiple definition of crypto_reset'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:237: first defined here
/usr/bin/ld: vpn_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: multiple definition of mutex'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:207: first defined here /usr/bin/ld: vpn_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: multiple definition of threads'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:214: first defined here
/usr/bin/ld: vpn_thread.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: multiple definition of `clients'; comp.o:/home/Reel/Downloads/tunnel/ctunnel/src/../include/ctunnel.h:230: first defined here
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:31: ctunnel] Error 1
make[1]: Leaving directory '/home/Reel/Downloads/tunnel/ctunnel/src'
make: *** [Makefile:3: all] Error 2

Is there an option to use ctunnel not only for encrypting the tunnel, but also to do authentication with the established tunnel?

So is it possible to use a generated pair of keys to encrypt the tunnel and only allow clients to connect which use the matching key from the server. This would be very useful for tunneled applications which do not have an own authentication option.

This would look like this:

Client ------> Server
TUN1 ------> TUN1
Key1 ------> Key1

so only a client which uses the Key1 to establish a connection is allowed to connect to the server.

Setting arrays like "threads" to static might get the code to compile on Ubuntu but these arrays aren't supposed to be static they should be shared between files eg. "threads" should be shared between tunnel_loop.c and tunnel_thread.c.

As stated in Homebrew/homebrew-core#22563, the website hosting a release for this is reporting 404 errors, and attempting to connect to www.nardcore.org (which is the only other mirror I see) is taking forever to load. Any chance that either site could be fixed?

Hello, I have 2 networks I want to connect together:
server A - public ip A, private ip 11.0.0.1, other servers with ips 11.0.0.2, ...
server B - public ip B, private ip 12.0.0.1, other servers with ips 12.0.0.2, ...

I started ctunnel like this:
server A: ctunnel -V -t 8 -i 1.0.0 -n -s -l 0.0.0.0:5001 -C aes-128-cfb -r 11.0.0.0/25
server B: ctunnel -V -t 8 -i 1.0.0 -n -c -f ip_A:5001 -C aes-128-cfb -r 12.0.0.0/25

I can ping 12.0.0.1 from A and 11.0.0.1 from B with no issue, however I can't figure why pinging other servers does not work.
from A: ping 12.0.0.2 returns Destination Host Prohibited
from B: ping 11.0.0.1 returns the same

Do you have any idea ? Is it something related to iptables, where I should do something, but really don't know what :)
I looked at the example, but couldn't understand what it was for.

By the way, great work :)

I've compiled the latest master branch, and I've tried specifying -z on both ends (client and server), only client, only server, and the connection just seems to reset.

Without -z I can make ctunnel work properly.

make -C src/
make[1]: Entering directory `/root/ctunnel-master/src'

                      ctunnel build using OPENSSL

gcc -g -Wall -Wextra -Wcast-align -Wshadow -Wstrict-prototypes -O2 -DHAVE_OPENSSL -I../include -I./include -DHAVE_TUNTAP -c -o ctunnel.o ctunnel.c
gcc -g -Wall -Wextra -Wcast-align -Wshadow -Wstrict-prototypes -O2 -DHAVE_OPENSSL -I../include -I./include -DHAVE_TUNTAP -c -o net.o net.c
gcc -g -Wall -Wextra -Wcast-align -Wshadow -Wstrict-prototypes -O2 -DHAVE_OPENSSL -I../include -I./include -DHAVE_TUNTAP -o ctunnel cidr.o comp.o crypto.o ctunnel.o exec.o jtok.o keyfile.o log.o net.o opt.o stats.o tun.o tunnel_loop.o tunnel_thread.o vpn_handshake.o vpn_loop.o vpn_thread.o -lz -lpthread -lutil -lc -lcrypto
ctunnel.o: In function main': /root/ctunnel-master/src/ctunnel.c:31: multiple definition of main'
cidr.o:/root/ctunnel-master/src/cidr.c:75: first defined here
net.o: In function in_subnet': /root/ctunnel-master/src/net.c:24: multiple definition of in_subnet'
cidr.o:/root/ctunnel-master/src/cidr.c:24: first defined here
net.o: In function cidr_to_mask': /root/ctunnel-master/src/net.c:40: multiple definition of cidr_to_mask'
cidr.o:/root/ctunnel-master/src/cidr.c:40: first defined here
collect2: ld returned 1 exit status
make[1]: *** [ctunnel] Error 1
make[1]: Leaving directory `/root/ctunnel-master/src'
make: *** [all] Error 2

But seems version 0.7 is fine

I just want to use a config file to use multi port forward in one process, not launch more..
Thank you.