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Re: [lwip-users] Help with basic application
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From: |
Noam weissman |
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Subject: |
Re: [lwip-users] Help with basic application |
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Date: |
Wed, 25 Jun 2014 16:19:29 +0300 |
Hi,
You should take an example and first run something that works.
First of all you must check your lwipopts.h file. This is per project.
Check if #define TCP_LISTEN_BACKLOG is set to 1 or not
Check if #define NO_SYS is set to 1 or not
Check if #define MEM_SIZE ???
Check UDP settings:
/* ---------- UDP options ---------- */
#define LWIP_UDP 1
#define UDP_TTL 255
Check if CHECKSUM_BY_HARDWARE is set to 1, if it is you must have a
hardware that supports that
If you work in RAW mode check that #define LWIP_RAW
1
If you are working with LwIP 1.4x and TCP_LISTEN_BACKLOG is set to
1 you must call accepted function
When a new connection is made.
If TCP_LISTEN_BACKLOG is set to 1 Example:
Define Server_pcb as global in your file or pass it as an arg to the new
server PCB. If you defined it global then:
static struct tcp_pcb *Server_pcb;
------ your init function ----------
void server_init(u16_t Port)
{
struct tcp_pcb *pcb;
err_t err;
pcb = tcp_new();
if(pcb != NULL)
{
// bind local IP with port
err = tcp_bind(pcb, IP_ADDR_ANY, Port);
if(err == ERR_OK)
{
// The tcp_listen() function returns a new connection control
block, and
// the one passed as an argument to the function will be
deallocated. The
// reason for this behavior is that less memory is needed for a
connection
// that is listening, so tcp_listen() will reclaim the memory
needed for
// the original connection and allocate a new smaller memory
block for the
// listening connection.
Server_pcb = tcp_listen(pcb);
// if we are here that mean that we did not use all available
connection
// and we are ready to treat another one.
tcp_setprio(Server_pcb, TCP_PRIO_MIN);
tcp_accept(Server_pcb, client_accept);
}
else
{
/* abort? output diagnostic? */
}
}
else
{
/* abort? output diagnostic? */
}
}
---------------- in your accept function -------------
err_t client_accept(void *arg, struct tcp_pcb *pcb, err_t err)
{
tcp_setprio(pcb, TCP_PRIO_NORMAL);
// disable nagle algorithm, improve performance with winxp.
tcp_nagle_disable(pcb);
// tcp stack, install callback for data received.
tcp_recv(pcb, client_recv);
// tcp stack, install callback for connection errors such as timeout
and TCP RST
tcp_err(pcb, conn_err);
// this function call does nothing. Usefull only if
TCP_LISTEN_BACKLOG is set.
// If TCP_LISTEN_BACKLOG is set to 1 and tcp_accepted function is not
called
// it will cause the server to stop working. So this function call is
a must.
tcp_accepted(Server_pcb);
return ERR_OK;
}
------------------------------------------------------------------------
----------------
Hope that helped...
BR,
Noam.
-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
RedCollarPanda
Sent: Wednesday, June 25, 2014 11:17 AM
To: address@hidden
Subject: [lwip-users] Help with basic application
Listen, ppl, I know you are tired of such questions and so on, but I
really need help. The thing is - i need a resver and a client made with
lwip library with raw interfaces. So far I didn't do much...
I REALLY need your help. Can you tell me - what am I doing wrong? I'll
tell what I'm doing.
First of all I compile the library. I didn't change the lwipopts.h - all
by default.
1) As I understood i need to call some init() method (func) and go to
the
while(true) { } endless cycle.
As I did -
int main(int argc, char** argv) {
echo_init();
std::cout << "endles cycle" << std::endl;
while(1) {
}
return 0;
}
2) In the echo_init(); function I must
a) echo_pcb = tcp_new(); // - create ne pcb
b) err_t err;
ip_addr_t ipaddr; //create variables for error checking and IP
address
I wanna use with my server.
c) IP4_ADDR(&ipaddr, 150,18,8,165); //Put in variable adress of MY
machine
/* ifconfig says
eth1 Link encap:Ethernet
inet addr:150.18.8.165 Bcast:150.18.11.255*
Mask:255.255.251.0 */
err = tcp_bind(echo_pcb, &ipaddr, 667); //than bind IP address and
desired port to the pcb
d) echo_pcb = tcp_listen(echo_pcb); //Than I listen pcb
tcp_accept(echo_pcb, echo_accept); //If there is request - accept
in
//End of init.
Is this logic correct?
The client.
I want to connect to ANY TCP server and transmit the package.
What I do :
1)
int main(int argc, char** argv) {
err_t err = hello_connect();
if (err != ERR_OK) {
std::cout << "err = " << err << std::endl;
}
std::cout << "End of Main" << std::endl;
return 0;
}
2) In hello_connect();
lwip_init();
u8_t *state;
err_t err;
struct tcp_pcb *pcb;
ip_addr_t ipaddr;
IP4_ADDR(&ipaddr, 150,18,8,165);
if ((state = mem_malloc(1)) == NULL) {
return ERR_MEM;
}
*state = 1;
if ((pcb = tcp_new()) == NULL) {
mem_free(state);
return ERR_MEM;
}
tcp_arg(pcb, state);
tcp_err(pcb, hello_err);
tcp_recv(pcb, hello_recv);
tcp_sent(pcb, NULL);
tcp_poll(pcb, hello_poll_close, 10);
tcp_bind(pcb,&ipaddr, 55555); //Bind ourselvs to the port 55555
and my own adress again
err = tcp_connect(pcb, &ipaddr, 667, hello_connected);
if (err != ERR_OK) {
std::cout << "err = " << err << std::endl;
mem_free(state);
tcp_abort(pcb);
}
Troubles:
1) Server begins it's work but creates tap0. Why?
tap0 Link encap:Ethernet HWaddr ************
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::a82b:dcff:fedf:3964/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:40 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 B) TX bytes:8136 (7.9 KiB)
Wanna scan and find my server with 667 port :
sudo nmap -sT -O 192.168.1.1
Starting Nmap 6.00 ( http://nmap.org ) at 2014-06-25 11:58 MSK Nmap scan
report for 192.168.1.1 Host is up (0.000011s latency).
Not shown: 996 closed ports
PORT STATE SERVICE
22/tcp open ssh
111/tcp open rpcbind
443/tcp open https
902/tcp open iss-realsecure
No exact OS matches for host (If you know what OS is running on it, see
http://nmap.org/submit/ ).
TCP/IP fingerprint:
OS:SCAN(V=6.00%E=4%D=6/25%OT=22%CT=1%CU=40454%PV=Y%DS=0%DC=L%G=Y%TM=53AA
812
OS:3%P=x86_64-unknown-linux-gnu)SEQ(SP=108%GCD=1%ISR=10A%TI=Z%CI=I%II=I%
TS=
OS:8)OPS(O1=M400CST11NW7%O2=M400CST11NW7%O3=M400CNNT11NW7%O4=M400CST11NW
7%O
OS:5=M400CST11NW7%O6=M400CST11)WIN(W1=8000%W2=8000%W3=8000%W4=8000%W5=80
00%
OS:W6=8000)ECN(R=Y%DF=Y%T=41%W=8018%O=M400CNNSNW7%CC=Y%Q=)T1(R=Y%DF=Y%T=
41%
OS:S=O%A=S+%F=AS%RD=0%Q=)T2(R=N)T3(R=N)T4(R=Y%DF=Y%T=41%W=0%S=A%A=Z%F=R%
O=%
OS:RD=0%Q=)T5(R=Y%DF=Y%T=41%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=4
1%W
OS:=0%S=A%A=Z%F=R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=41%W=0%S=Z%A=S+%F=AR%O=%RD=0%
Q=)
OS:U1(R=Y%DF=N%T=41%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)IE(R=
Y%D
OS:FI=N%T=41%CD=S)
Network Distance: 0 hops
OS detection performed. Please report any incorrect results at
http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 25.97 seconds
So where is my server???
when I execute client
"tcp_connect to port 667"
And that is it....
By the way if I'm making client like this :
u8_t *state;
err_t err;
struct tcp_pcb *pcb;
ip_addr_t ipaddr;
netif_init();
IP4_ADDR(&ipaddr, 127,0,0,1);
if ((state = mem_malloc(1)) == NULL) {
return ERR_MEM;
}
*state = 1;
if ((pcb = tcp_new()) == NULL) {
mem_free(state);
return ERR_MEM;
}
tcp_arg(pcb, state);
tcp_err(pcb, hello_err);
tcp_recv(pcb, hello_recv);
tcp_sent(pcb, NULL);
tcp_poll(pcb, hello_poll_close, 10);
err = tcp_connect(pcb, &ipaddr, 667, hello_connected);
if (err != ERR_OK) {
std::cout << "err = " << err << std::endl;
std::cout << "err = " << (int)err << std::endl;
mem_free(state);
tcp_abort(pcb);
}
then I have this in my console
LWIP_HAVE_LOOPIF = 1
tcp_connect to port 667
ip_output_if: lo2
IP header:
+-------------------------------+
| 4 | 5 | 0x00 | 44 | (v, hl, tos, len)
+-------------------------------+
| 0 |000| 0 | (id, flags, offset)
+-------------------------------+
| 255 | 6 | 0xbdc9 | (ttl, proto, chksum)
+-------------------------------+
| 127 | 0 | 0 | 1 | (src)
+-------------------------------+
| 127 | 0 | 0 | 1 | (dest)
+-------------------------------+
netif_loop_output()
tcpip_thread: CALLBACK 0x7f1fbe811868
ip_input: packet accepted on interface lo
ip_input:
IP header:
+-------------------------------+
| 4 | 5 | 0x00 | 44 | (v, hl, tos, len)
+-------------------------------+
| 0 |000| 0 | (id, flags, offset)
+-------------------------------+
| 255 | 6 | 0xbdc9 | (ttl, proto, chksum)
+-------------------------------+
| 127 | 0 | 0 | 1 | (src)
+-------------------------------+
| 127 | 0 | 0 | 1 | (dest)
+-------------------------------+
ip_input: p->len 44 p->tot_len 44
ip_output_if: lo2
IP header:
+-------------------------------+
| 4 | 5 | 0x00 | 40 | (v, hl, tos, len)
+-------------------------------+
| 1 |000| 0 | (id, flags, offset)
+-------------------------------+
| 255 | 6 | 0xbdcc | (ttl, proto, chksum)
+-------------------------------+
| 127 | 0 | 0 | 1 | (src)
+-------------------------------+
| 127 | 0 | 0 | 1 | (dest)
+-------------------------------+
netif_loop_output()ip_input: packet accepted on interface lo
ip_input:
IP header:
+-------------------------------+
| 4 | 5 | 0x00 | 40 | (v, hl, tos, len)
+-------------------------------+
| 1 |000| 0 | (id, flags, offset)
+-------------------------------+
| 255 | 6 | 0xbdcc | (ttl, proto, chksum)
+-------------------------------+
| 127 | 0 | 0 | 1 | (src)
+-------------------------------+
| 127 | 0 | 0 | 1 | (dest)
+-------------------------------+
ip_input: p->len 40 p->tot_len 40
hello_err BEGINE //This is the mark of error handler
hello_err END //This is the mark of error handler
tcp_pcb_purge
tcp_pcb_purge: data left on ->unacked
tcpip_thread: CALLBACK 0x7f1fbe811840
tcpip_thread: PACKET 0x7f1fbe8119a8
WHRERE are the packets going?? Who recieves them?
Summary:
I need to make them both working -
Server to w8 for the data, get it and show it.
Client send data to the server.
I wanna use IP on my machine, just change the port number.
What's wrong here?
--
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