IPv6 socket server in C under linux, C#, java

 

chat-ipv6

is same as a forking ipv6 server, but using clone(2) for posix threads instead of fork (copying entire process image).

currently only availible for linux / unix and gcc

build project

client6.s and server6_clone.s can be compiled and linked with GNU make utility by using existing Makefile.

change directory to source and Makefile containing directory server6-clone.

• cd server6-clone/

Now clean project to delete outdated binary executables or objects.

• make clean

  rm -f client6 client6.o server6_clone server6_clone.o
  

build client6

• make client6

  ggcc "-Wimplicit-function-declaration" -o client6.o -c  client6.c

  client6.c: In function ‘ping’:
  client6.c:42:27: warning: embedded ‘\0’ in format [-Wformat-contains-nul]
  42 |     sprintf(inbuf, "%s\r\n\0", msg); 
     |                           ^~
  client6.c:49:16: warning: function returns address of local variable [-Wreturn-local-addr]
  49 |         return &outbuf[0];
     |                ^~~~~~~~~~
  client6.c: In function ‘main’:
  client6.c:92:17: warning: implicit declaration of function ‘close’; did you mean ‘pclose’? [-Wimplicit-function-declaration]
  92 |                 close(sd);
     |                 ^~~~~
     |                 pclose
  gcc "-Wimplicit-function-declaration" -o client6 client6.o

build server6

• make server6_clone
  
  

  gcc  "-Wimplicit-function-declaration" -o server6.o -c server6.c
  gcc "-Wimplicit-function-declaration" -o server6 server6.o
  

start server at a custom tcpv6 port

• ./server6 "2600:1f18:7a3f:a700::6291" 7777
  

  ./server6 program started...
  server trys listening on address 2600:1f18:7a3f:a700::6291 port: 7777
  ./server6: cannot clone(2), trying to fork(2)./server6: offset: 1024,   pagesze_offet: 4095,    pa_offset: 0,
  sockets:        s_sd=3, c_sd=4
  ./server6: cannot clone(2), trying to fork(2)./server6: client request handled after sending/receiving 136 bytes total.
  ./server6       closed client socket descriptor 4 now, exiting in 1 secondchild pid: 231095child pid 231095 exited, status=0, done=1
  ^C
  zen@virginia:~/prog/chat-ipv6/c-server6$ sudo ./server6 "2600:1f18:7a3f:a700::6291" 7777
  ./server6 program started...
  server trys listening on address 2600:1f18:7a3f:a700::6291 port: 7777
  ./server6:      offset: 1024,   pagesze_offet: 4095,    pa_offset: 0,
  sockets:        s_sd=3, c_sd=4
  ./server6:      client request handled after sending/receiving 136 bytes total.
  child pid: 231102 child pid 231102 exited, status=0, done=1
  ./server6:      offset: 1024,   pagesze_offet: 4095,    pa_offset: 0,
  sockets:        s_sd=3, c_sd=5
  ./server6:      client request handled after sending/receiving 135 bytes total.
  child pid: 231107 child pid 231107 exited, status=0, done=1

java ipv4/ipv6 EchoServer & EchoClient

compile java sources with any javac compiler

Windows

• winmake

  winmake.bat
  > echo "building now EchoServer classes..."
  "building now EchoServer classes..."
  > javac EchoServer.java
  > echo "building now EchoClient class."
  "building now EchoClient class."
  > javac EchoClient.java
  > dir *.class
  Directory of C:\Users\heinr\source\chat-ipv6\java-server6
  10/12/2024  03:40             3.188 EchoClient.class
  10/12/2024  03:40             5.368 EchoServer.class
             2 File(s)          8.556 bytes

Linux

• make all

  zen@virginia:~/prog/chat-ipv6/java-server6$ make all
  rm -f *.class
  javac EchoServer.java
  javac EchoClient.java
  zen@virginia:~/prog/chat-ipv6/java-server6$ ls -al *.class
  -rw-r--r-- 1 zen mailers 3188 Dec 10 03:44 EchoClient.class
  -rw-r--r-- 1 zen mailers 5368 Dec 10 03:44 EchoServer.class
  zen@virginia:~/prog/chat-ipv6/java-server6$

starting java socket server with no args for both ipv4/6

• java EchoServer "172.31.20.156" "2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5" 7777

zen@paris:~/prog/chat-ipv6/java-server6$ java EchoServer "172.31.20.156" "2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5" 7777
server address set to 172.31.20.156
server address6 set to 2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5
Simple TCP Echo Server started ...
Simple TCP Echo Server started ...
EchoServer is listening on address 2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5 port 7777.
EchoServer is listening on address 172.31.20.156 port 7777.
Accepted connection to 2600:1f18:7a3f:a700:0:0:0:6291 (2600:1f18:7a3f:a700:0:0:0:6291) on port 58318.
Receiving from socket:
Finished, now sending back to socket:
2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5 =>      2600:1f18:7a3f:a700:0:0:0:6291   uname -a : Linux ip-172-31-57-91 6.8.0-1019-aws #21-Ubuntu SMP Wed Nov  6 21:21:49 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
client socket close()
Accepted connection to ec2-100-26-162-115.compute-1.amazonaws.com (100.26.162.115) on port 48304.
Receiving from socket:
Finished, now sending back to socket:
172.31.20.156  =>      ec2-100-26-162-115.compute-1.amazonaws.com/100.26.162.115       uname -a : Linux ip-172-31-57-91 6.8.0-1019-aws #21-Ubuntu SMP Wed Nov  6 21:21:49 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
client socket close()

starting java echo client

• java EchoClient "2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5" 7777 "uname -a : uname -a "

zen@virginia:~/prog/chat-ipv6/java-server6$ java EchoClient "2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5"  7777 "uname -a : `uname -a` "
Receiving:
2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5 =>      2600:1f18:7a3f:a700:0:0:0:6291   uname -a : Linux ip-172-31-57-91 6.8.0-1019-aws #21-Ubuntu SMP Wed Nov  6 21:21:49 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
finished
zen@virginia:~/prog/chat-ipv6/java-server6$ java EchoClient "13.38.136.165"  7777 "uname -a : `uname -a` "
Receiving:
172.31.20.156  =>      ec2-100-26-162-115.compute-1.amazonaws.com/100.26.162.115       uname -a : Linux ip-172-31-57-91 6.8.0-1019-aws #21-Ubuntu SMP Wed Nov  6 21:21:49 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
finished
^C