dhavalkapil/icmptunnel

Transparently tunnel your IP traffic through ICMP echo and reply packets.

icmptunnel's Issues

compile error on termux (rooted)

https://pastebin.com/pB4anMSG

Tag a release?

Hello, I am currently maintaining the git build of this package on the AUR: https://aur.archlinux.org/packages/icmptunnel-git/ but would like to package a "stable" release. Even if this is a pre-1.0 release, could you please tag a version?

feature to add client for linphone

hello..
i have client is linphone mobile.
so can u help me to develop for linphone client where to implement it in code?

please

Thanks
Dipen

Segmentation fault

After compiling and executing

# ./icmptunnel

I am getting segmentation fault. Tested this on both debian 8 and ubuntu 14.04 and both give same error.

removed

removed

Can't connect server ip

[DEBUG] Allocating tunnel
[DEBUG] Allocatating tunnel2[DEBUG] Created tunnel tun0
[DEBUG] Starting tunnel - Dest: ..., Server: 0
[DEBUG] Opening ICMP socket
SIOCDELRT: No such process
SIOCADDRT: Network is unreachable
SIOCADDRT: Network is unreachable
[DEBUG] Error in running script

cant bind tun0 address to create a socks proxy

It runs correctly on both ends, but when I try to ssh -D 4444 [email protected] nothing happens:

on server I run sudo ./icmptunnel -s 10.0.1.1, on client sudo ./icmptunnel -c serverip and I have:

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.0.0.0        0.0.0.0         255.255.255.0   U     600    0        0 wlp2s0
serverip    10.0.0.1        255.255.255.255 UGH   0      0        0 wlp2s0
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0

and

$ ip a show tun0
13: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1472 qdisc fq_codel state UNKNOWN group default qlen 500
    link/none 
    inet 10.0.1.2/24 scope global tun0
       valid_lft forever preferred_lft forever
    inet6 fe80::9971:42bb:d660:fd84/64 scope link flags 800 
       valid_lft forever preferred_lft forever

what am I doing wrong here?

note: strangely enought if I try: sudo ssh -D 4444 root@serverip I get prompted for password when I set on server to never ask for that...

# cat /etc/ssh/sshd_config|grep Password
PermitEmptyPasswords no
PasswordAuthentication no

This is another issue but can also be related, sometimes when I press ctrl+c I get this on server side
[DEBUG] Read ICMP packet with src: 10.0.0.29, dest: 10.0.0.12, payload_size: 24, payload: x��� or [DEBUG] Read ICMP packet with src: 10.0.0.29, dest: 10.0.0.12, payload_size: 24, payload: '��D�#�@xxxxxxxxxxxxxxxx�� pls give me some hint, thanks!

authentication

there should be some means of encrypted (one-time) authentication (per ip) so not everyone can use the icmp proxy server.

work On centos 7

Hi dear friend This git clone work on centos 7????

Security issues and smal improvements

• Why not use calloc instead of malloc+setmem to set zeros ?
• I saw many strcpy functions without check the input, why not use strncpy ?

Good job, anyway!

Payload size is small.

[DEBUG] Reading from tunnel
[DEBUG] Sending ICMP packet with payload_size: 60, payload: E
[DEBUG] Data needs to be readed from tun device
[DEBUG] Preparing ICMP packet to be sent
[DEBUG] Destination address: 192.168.56.105
[DEBUG] Reading from tunnel
[DEBUG] Sending ICMP packet with payload_size: 60, payload: E
[DEBUG] Data needs to be readed from tun device
[DEBUG] Preparing ICMP packet to be sent
[DEBUG] Destination address: 192.168.56.105
[DEBUG] Reading from tunnel
[DEBUG] Sending ICMP packet with payload_size: 60, payload: E

As you can see payload_size is very small and hence viewing any page is almost impossible , any workaround this problem?

error while running tunnel on client

[DEBUG] Allocating tunnel
Error returned by ioctl(): Unknown error -1
Error in tun_alloc()
: Device or resource busy

I receive this error while i try to run icmp tunnel on client, i followed all the istructions of the demo

Sending a Ping, crashes the server

ping u.u.u.u crashes the server. Here is a log of the server

[DEBUG] Read ICMP packet with src: x.x.x.x , dest: u.u.u.u, payload_size: 56, payload: �TGV
[DEBUG] Writing to tunnel
Unable to write to tunnel
: Invalid argument

i got error

on the Client

[DEBUG] Allocating tunnel
[DEBUG] Allocatating tunnel2[DEBUG] Created tunnel tun0
[DEBUG] Starting tunnel - Dest: xx.xx.xx.xx, Server: 0
[DEBUG] Opening ICMP socket
SIOCDELRT: No such process
client.sh: 11: client.sh: Syntax error: newline unexpected
[DEBUG] Error in running script
[DEBUG] Data needs to be readed from tun device
[DEBUG] Preparing ICMP packet to be sent
[DEBUG] Destination address: xx.xx.xx.xx
[DEBUG] Reading from tunnel
[DEBUG] Sending ICMP packet with payload_size: 48, payload: `
[DEBUG] Data needs to be readed from tun device
[DEBUG] Preparing ICMP packet to be sent
[DEBUG] Destination address: xx.xx.xx.xx
[DEBUG] Reading from tunnel
[DEBUG] Sending ICMP packet with payload_size: 48, payload: `
[DEBUG] Data needs to be readed from tun device
[DEBUG] Preparing ICMP packet to be sent
[DEBUG] Destination address: xx.xx.xx.xx
[DEBUG] Reading from tunnel
[DEBUG] Sending ICMP packet with payload_size: 48, payload: `

Client dont have internet

on Client i dont have internet , also i ping 4.2.2.4 or 8.8.8.8 but failed .

Completion of error handling

Would you like to add more error handling for return values from functions like "malloc"?

Encrypt traffic?

Should data be encrypted in transit? A simple shared-secret between client and server may suffice. In this way any PCAP solution won't see the raw data and may not detect the tunnel.

Make Problem

Hello,
I installed icmptunnel on ubuntu 14.04 and when wrote make I getting this error,

gcc -c -o icmptunnel.o icmptunnel.c -I. -O3 -Wall
make: gcc: Command not found
make: *** [icmptunnel.o] Error 127

Can you help me with this problem? Sorry if the problem is so basic. I'm new guy

Unable to write to tunnel

So , I was playing around this tool but I could not get it started on a vps because program exited saying
Unable to write to tunnel : Invalid argument. Here's a screenshot to illustrate the issue

I used Arch Linux here but I had same issue with debian 8

does it support icmpv6

does it support icmpv6

Compile Error on OS X Capitain

This is the error I get when I try to compile icmptunnel on OS X Capitain.

icmptunnel git:(master) make
gcc -c -o icmptunnel.o icmptunnel.c -I.
gcc -c -o icmp.o icmp.c -I.
icmp.c:22:29: warning: declaration of 'struct iphdr' will not be visible outside of this function [-Wvisibility]
void prepare_headers(struct iphdr *ip, struct icmphdr *icmp);
                            ^
icmp.c:22:47: warning: declaration of 'struct icmphdr' will not be visible outside of this function [-Wvisibility]
void prepare_headers(struct iphdr *ip, struct icmphdr *icmp);
                                              ^
icmp.c:100:3: warning: implicit declaration of function 'inet_pton' is invalid in C99 [-Wimplicit-function-declaration]
  inet_pton(AF_INET, packet_details->src_addr, &src_addr);
  ^
icmp.c:103:17: error: invalid application of 'sizeof' to an incomplete type 'struct iphdr'
  packet_size = sizeof(struct iphdr) + sizeof(struct icmphdr) + packet_details->payload_size;
                ^     ~~~~~~~~~~~~~~
icmp.c:91:10: note: forward declaration of 'struct iphdr'
  struct iphdr *ip;
         ^
icmp.c:103:40: error: invalid application of 'sizeof' to an incomplete type 'struct icmphdr'
  packet_size = sizeof(struct iphdr) + sizeof(struct icmphdr) + packet_details->payload_size;
                                       ^     ~~~~~~~~~~~~~~~~
icmp.c:92:10: note: forward declaration of 'struct icmphdr'
  struct icmphdr *icmp;
         ^
icmp.c:114:38: error: invalid application of 'sizeof' to an incomplete type 'struct iphdr'
  icmp = (struct icmphdr *)(packet + sizeof(struct iphdr));
                                     ^     ~~~~~~~~~~~~~~
icmp.c:91:10: note: forward declaration of 'struct iphdr'
  struct iphdr *ip;
         ^
icmp.c:115:36: error: invalid application of 'sizeof' to an incomplete type 'struct iphdr'
  icmp_payload = (char *)(packet + sizeof(struct iphdr) + sizeof(struct icmphdr));
                                   ^     ~~~~~~~~~~~~~~
icmp.c:91:10: note: forward declaration of 'struct iphdr'
  struct iphdr *ip;
         ^
icmp.c:115:59: error: invalid application of 'sizeof' to an incomplete type 'struct icmphdr'
  icmp_payload = (char *)(packet + sizeof(struct iphdr) + sizeof(struct icmphdr));
                                                          ^     ~~~~~~~~~~~~~~~~
icmp.c:92:10: note: forward declaration of 'struct icmphdr'
  struct icmphdr *icmp;
         ^
icmp.c:117:19: warning: incompatible pointer types passing 'struct iphdr *' to parameter of type 'struct iphdr *' [-Wincompatible-pointer-types]
  prepare_headers(ip, icmp);
                  ^~
icmp.c:22:36: note: passing argument to parameter 'ip' here
void prepare_headers(struct iphdr *ip, struct icmphdr *icmp);
                                   ^
icmp.c:117:23: warning: incompatible pointer types passing 'struct icmphdr *' to parameter of type 'struct icmphdr *' [-Wincompatible-pointer-types]
  prepare_headers(ip, icmp);
                      ^~~~
icmp.c:22:56: note: passing argument to parameter 'icmp' here
void prepare_headers(struct iphdr *ip, struct icmphdr *icmp);
                                                       ^
icmp.c:119:5: error: incomplete definition of type 'struct iphdr'
  ip->tot_len = htons(packet_size);
  ~~^
icmp.c:91:10: note: forward declaration of 'struct iphdr'
  struct iphdr *ip;
         ^
icmp.c:120:5: error: incomplete definition of type 'struct iphdr'
  ip->saddr = src_addr.s_addr;
  ~~^
icmp.c:91:10: note: forward declaration of 'struct iphdr'
  struct iphdr *ip;
         ^
icmp.c:121:5: error: incomplete definition of type 'struct iphdr'
  ip->daddr = dest_addr.s_addr;
  ~~^
icmp.c:91:10: note: forward declaration of 'struct iphdr'
  struct iphdr *ip;
         ^
icmp.c:125:7: error: incomplete definition of type 'struct icmphdr'
  icmp->type = packet_details->type;
  ~~~~^
icmp.c:92:10: note: forward declaration of 'struct icmphdr'
  struct icmphdr *icmp;
         ^
icmp.c:126:7: error: incomplete definition of type 'struct icmphdr'
  icmp->checksum = 0;
  ~~~~^
icmp.c:92:10: note: forward declaration of 'struct icmphdr'
  struct icmphdr *icmp;
         ^
icmp.c:127:7: error: incomplete definition of type 'struct icmphdr'
  icmp->checksum = in_cksum((unsigned short *)icmp, sizeof(struct icmphdr) + packet_details->payload_size);
  ~~~~^
icmp.c:92:10: note: forward declaration of 'struct icmphdr'
  struct icmphdr *icmp;
         ^
icmp.c:127:53: error: invalid application of 'sizeof' to an incomplete type 'struct icmphdr'
  icmp->checksum = in_cksum((unsigned short *)icmp, sizeof(struct icmphdr) + packet_details->payload_size);
                                                    ^     ~~~~~~~~~~~~~~~~
icmp.c:92:10: note: forward declaration of 'struct icmphdr'
  struct icmphdr *icmp;
         ^
icmp.c:162:83: warning: passing 'int *' to parameter of type 'socklen_t *' (aka 'unsigned int *') converts between pointers to integer types with different sign [-Wpointer-sign]
  packet_size = recvfrom(sock_fd, packet, MTU, 0, (struct sockaddr *)&(src_addr), &src_addr_size);
                                                                                  ^~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/include/sys/socket.h:592:25: note: passing argument to parameter here
                socklen_t * __restrict) __DARWIN_ALIAS_C(recvfrom);
                                      ^
icmp.c:165:38: error: invalid application of 'sizeof' to an incomplete type 'struct iphdr'
  icmp = (struct icmphdr *)(packet + sizeof(struct iphdr));
                                     ^     ~~~~~~~~~~~~~~
icmp.c:147:10: note: forward declaration of 'struct iphdr'
  struct iphdr *ip;
         ^
icmp.c:166:36: error: invalid application of 'sizeof' to an incomplete type 'struct iphdr'
  icmp_payload = (char *)(packet + sizeof(struct iphdr) + sizeof(struct icmphdr));
                                   ^     ~~~~~~~~~~~~~~
icmp.c:147:10: note: forward declaration of 'struct iphdr'
  struct iphdr *ip;
         ^
icmp.c:166:59: error: invalid application of 'sizeof' to an incomplete type 'struct icmphdr'
  icmp_payload = (char *)(packet + sizeof(struct iphdr) + sizeof(struct icmphdr));
                                                          ^     ~~~~~~~~~~~~~~~~
icmp.c:148:10: note: forward declaration of 'struct icmphdr'
  struct icmphdr *icmp;
         ^
icmp.c:169:3: warning: implicit declaration of function 'inet_ntop' is invalid in C99 [-Wimplicit-function-declaration]
  inet_ntop(AF_INET, &(ip->saddr), packet_details->src_addr, INET_ADDRSTRLEN);
  ^
icmp.c:169:26: error: incomplete definition of type 'struct iphdr'
  inet_ntop(AF_INET, &(ip->saddr), packet_details->src_addr, INET_ADDRSTRLEN);
                       ~~^
icmp.c:147:10: note: forward declaration of 'struct iphdr'
  struct iphdr *ip;
         ^
icmp.c:170:26: error: incomplete definition of type 'struct iphdr'
  inet_ntop(AF_INET, &(ip->daddr), packet_details->dest_addr, INET_ADDRSTRLEN);
                       ~~^
icmp.c:147:10: note: forward declaration of 'struct iphdr'
  struct iphdr *ip;
         ^
icmp.c:171:30: error: incomplete definition of type 'struct icmphdr'
  packet_details->type = icmp->type;
                         ~~~~^
icmp.c:148:10: note: forward declaration of 'struct icmphdr'
  struct icmphdr *icmp;
         ^
icmp.c:172:48: error: invalid application of 'sizeof' to an incomplete type 'struct iphdr'
  packet_details->payload_size = packet_size - sizeof(struct iphdr) - sizeof(struct icmphdr);
                                               ^     ~~~~~~~~~~~~~~
icmp.c:147:10: note: forward declaration of 'struct iphdr'
  struct iphdr *ip;
         ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
7 warnings and 20 errors generated.
make: *** [icmp.o] Error 1

Traffic IP

Ignore simple ping

If a machine ping me during the program is launched, icmptunnel crashed with this error:

root@debian:~/icmptunnel# ./icmptunnel -s 10.0.1.1
[DEBUG] Allocatating tunnel
[DEBUG] Allocatating tunnel2[DEBUG] Created tunnel tun0
[DEBUG] Starting tunnel - Dest: 10.0.1.1, Server: 1
[DEBUG] Opening ICMP socket
[DEBUG] Binding ICMP socket
0+1 records in
0+1 records out
2 bytes (2 B) copied, 9.6663e-05 s, 20.7 kB/s
0+1 records in
0+1 records out
2 bytes (2 B) copied, 7.4032e-05 s, 27.0 kB/s
[DEBUG] Script ran successfully
[DEBUG] Received ICMP packet
[DEBUG] Read ICMP packet with src: 194.90.37.75, dest: 94.23.11.59, payload_size: 129, payload: E
[DEBUG] Writing to tunnel
[DEBUG] Src address being copied: 194.90.37.75
[DEBUG] Received ICMP packet
[DEBUG] Read ICMP packet with src: 188.235.15.178, dest: 94.23.11.59, payload_size: 129, payload: Ep
[DEBUG] Writing to tunnel
[DEBUG] Src address being copied: 188.235.15.178
[DEBUG] Received ICMP packet
[DEBUG] Read ICMP packet with src: 92.222.185.1, dest: 94.23.11.59, payload_size: 4, payload: ^�
;
[DEBUG] Writing to tunnel
Unable to write to tunnel
: Invalid argument

compiling on Cygwin

Hi, Could this compile on Cygwin?

deleted

deleted

[Question] Is the usecase of this software different from `sshuttle` ?

@DhavalKapil

Demo

Just wanted to let you know that I've built a 5-container demo of your tool. It includes an instance of Wireshark (with a web interface) and a PDF showing how to set up and use the demo. The code is at:

https://github.com/packetgeek/icmptunnel-docker-demo

Go ahead and close (or delete) this issue. Just wanted to let y'all know about it.