I am trying to retrieve an interface's MAC address using netlink address. I got to a point, where I am able to parse the reply for 'RTM_GETLINK' till 'case IFLA_ADDRESS'. After that, I have no idea to print the MAC address.
View 1 RepliesI write the network driver. Transmission of packets in user space I do through netlink socket`s. In user space there is a handling of packets and their transmission on other device (however, it isn't important).
Problem in that any time, packets through the driver in system, and is reverse, are transferred normally. But then there comes the moment when the kernel crash. If to look in syslog it seems to me that comes deadlock. Also I think that it is related with netlink socket`s.
I can't find the information on that anywhere how correctly to use netlink socket`s in kernel space. Can at you will any a reason into the account of synchronization of sockets and the driver in kernel space?
I can give the driver code if it is necessary.
I would like to get my Slackware 11 to work with the Broadcom NetLink BCM5787 onboard Ethernet Cards (x2). I have downloaded the tg3 driver from the Broadcom site. I copied and extracted the driver onto the Linux harddisk. When I wanted to build it I got the message, tg3_compat.h: error : redefinition of 'msecs_to_jiffies'previous delay.h : error: definition 'msecs_to jiffies" was here"
View 3 Replies View RelatedI just installed gewsense on my dell studio xps. I have a dual boot with windows vista. Problem is I cant get the internet to work via lan or wireless. I have read it could be incompatibility with my hardware but wanted to know what can I do to troubleshoot and resolve.
View 3 Replies View Relatedhow to differentiate cores and sockets in CPU?
View 5 Replies View RelatedWhen I run "netstat -a" commnand, it display:
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags Type State I-Node Path
unix 2 [ ACC ] STREAM LISTENING 20269 /tmp/.gdm_socket
...
unix 2 [ ] DGRAM 997161
unix 3 [ ] STREAM CONNECTED 942628 /tmp/.X11-unix/X0
unix 3 [ ] STREAM CONNECTED 942627
unix 3 [ ] STREAM CONNECTED 942626 /tmp/.X11-unix/X0 ....
Why some socket don't have Path name? And what mean's RefCnt = 2?
I have written simple TCP server-client programs in 'C' on my RHEL 5 64 bit.I want to add SEND and RECEIVE timeout for this socket; so that if server is not responding in given time, request will get timeout instead of waiting in "recv" call.But I failed to do so.
View 6 Replies View RelatedDuring my startup I saw this line; Code: err, eth0: netlink: No such process My internet connection went down when I log on to my system.Any idea on this problem.I use realtek RTL8211CL network card,the built-in network card in my inspiron 1440.
View 3 Replies View RelatedHow can I force all currently open sockets in linux to close from the command line?
View 2 Replies View RelatedI am trying to write a chat program with sockets as part of my project. I made a socket server, using fork ,I tried to connect it with different clients.Each client will send messages to others through server.So server has a shared memory storing every clients username and client id. But the problem facing is first client is able to sent messages to every other client formed after that.But second client onwards it is not able to sent message to previously connected ones. Server is not able to write on those client id's.
View 4 Replies View RelatedI am trying to access a generic netlink family to send messages from user-space to the kernel. I am using libnl example here [URL].. The problem is that I keep getting
Code:
error: netlink/genl/genl.h: No such file or directory
error: netlink/genl/ctrl.h: No such file or directory
You would think I have not installed libnl and libnl-devel but I have.
[Code]...
I have just installed Ubuntu 10.04 and it works fine. Next, I attempted to install Apache 2.2.16 server on the machine. I was able to get Apache installed but I cant't get it to start. The command I used to get it to start is "apachectl -k start" and got the response "command not found". Then I used the absolute path which is "/home/Administrator/Downloads/apache/bin/apachectl -k start" and got the response"httpd: could not reliably determine ther server's fully qualified domain name, using 127.0.1.1 for ServerName(13)Permission denied: make_sock: could not bind to address 0.0.0.0:80.no listening to sockets available, shutting down". Please advise me on what to do. My eyes hurt from looking at the screen for so long trying different options and reading almost all the apache install instructions that exists. Just ready to have it up and running.
View 7 Replies View RelatedI am looking for a way to delete the systems default gateway from the routing table via the NETLINK API.Unfortunately, the documentation I found about NETLINK is incomplete.There are some basics (communicating with the kernel, reading the routing table) but not much more.Does anyone know the packet format for deleting a routing table entry, especially deleting the default gateway? I can set or change the default gateway with the following parameters (there are more, but I left out all the non-essential ones):
NL-Msg Header:
nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE;
nlmsg_type = RTM_NEWROUTE;
[code]....
When I typed netstat -lna, the output:
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:580 0.0.0.0:* LISTEN
...
...
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags Type State I-Node
unix 2 [ ACC ] STREAM LISTENING 23581
...
...
Can anyone explain to me:
1. What is "Active Internet connections" & "Active UNIX domain sockets"?
2. What is unix Proto?
3. Difference between LISTEN and LISTENING state.
I'just installed ubuntu 10.04 LTS on my new laptop(ACER aspire 5750). Ubuntu installed perfectly. Every things working ok but, it can't able to detect my CABLE MODEM.
View 1 Replies View Relatedwhat is Production IP address and Management IP address in Linux servers? What is the significance of these two? When to use what?
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View 1 Replies View Relatedim REALLY new with linux and ive downloaded and installed Ubuntu...now heres the question.how do i set up WLAN internet use? ive tried using ipconfig/all on windows command but im not sure which info to use where save for the Physical Address going towards the MAC Address info
View 14 Replies View Relatedi'am tring to use generic netlink and can't find function for blocking not busy waiting receive. I'll try to explain myself. Generic netlink receive mechanism based on callback function - when module receives something,this function invoked. But this is not so good if you need to send something and receive answer. I mean something like that :
sendmsg(); if(recvmsg() < 0) goto err; I need generic netlink recv() function, or some mechanism to implement it. I just want to stay in "recvmsg()" function until i have answer(until call_back function invoked).
What's the total no. that the OS can create? Does this differ from 32-bit?
View 1 Replies View RelatedIs there any way to implement a simple ping script in C (unix)? I'm programming simple OpenWRT scripts.
I have found some examples of ping in C:
[URL]
However, nothing happens, nothing is sent.
When I look at the code, in the portion where the socket is created, I can see that the socket is not binding to any interface:
Code:
if ((sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP)) == -1)
{
perror("socket");
exit(EXIT_FAILURE);
}
setsockopt(sockfd, IPPROTO_IP, IP_HDRINCL, &optval, sizeof(int));
Instead, it uses "setsockopt" to set some options.
My guess is that it is trying to send packets over the eth0 interface instead over the wl0 (wireless) interface (which is the one I want to use to send pings).
Now, my question is: Is there any other way to send pings in C by binding to an interface?
Here's a silly question: suppose I want to "grep" an entire directory. Real life example: we reconfigured our mail server to a different IP address, so I needed to search for each occurrence of the original to make sure they'd all been changed.
A simple
Code:
grep -i -l -r "192.168.1.200" *
... works great until it hits a socket. This particular mail server has sockets scattered at random through the directory. When grep hits one of these, it hangs.
I've tried every command line option I can think of it to force it to ignore these sockets, but to no avail. Any of you Grep Gurus out there want to give me a hand?
Hi ,
I created a socket.port no 21 meaning ftp client.
I am sending some stings and receviing some data from server.Fine.
But I want to send a file some x.c to host using socket.
Please can someone help me whether we can do it or not.
If we can how can we send a file.I was only able to send buffer and data but not a file.Please if possible can you help me with example.
Regards,
shaiva
I need to create a C/C++ program in Linux that succeeds in detecting how many tcp-sockets and what tcp-sockets are created by the other processes in the system in a particular time interval (e.g., the interval time this application is running in). Then, I'd need to get some information like local/remote port number and local/remote ip address of each of these sockets.
View 8 Replies View RelatedI am struggling a little on how to best approach this problem. I have wrote a server program that runs via xinetd, that obviously spits out data at the client end. Fairly straightforward stuff?There is a point in my server code where I need to display an image/gui i.e something that runs on X11 that prompts a user to perform a task on the display connected at the the server side.So far I have written a test program that displays some text at the client end and then launches the browser at the server end. I have also set the following export. Code: export DISPLAY=:0 and then goes on to launch my web browser. Works great when ran locally on the server and when I remotely telnet in to the server and run the code.
However when I try to run the same piece of code as a xinetd service the export seems to have zero affect and the client terminal window displays errors associated with there not being a X11 server running.The code launches fine when I create a socket to serverip:6556 it just the ability to display gui programs to another display that does not seem to be working.
The problem started when I noticed I couldn't upload to people using a torrent downloading program, the program listened on port X and when I sniffed on the same port I saw that syn's are forwarded correctly from my nat to that port but the program doesn't relate to those packets. Then I listened with NC, and even on another port nothing is being answered to those syns packets.
View 3 Replies View RelatedCan someone help me with this problem,trying to send a packet,using tcp/ip,the packet should look like this:
Code:
field 1: SOCKS protocol version, 1 byte (0x05 for this version)
field 2: status, 1 byte:
0x00 = request granted
0x01 = general failure
0x02 = connection not allowed by ruleset
0x03 = network unreachable
0x04 = host unreachable
0x05 = connection refused by destination host
0x06 = TTL expired
0x07 = command not supported / protocol error
0x08 = address type not supported
field 3: reserved, must be 0x00
field 4: address type, 1 byte:
0x01 = IPv4 address
0x03 = Domain name
0x04 = IPv6 address
field 5: destination address of
4 bytes for IPv4 address
1 byte of name length followed by the name for Domain name
16 bytes for IPv6 address
field 6: network byte order port number, 2 bytes
and this is my code:
Code:
int domainLen = strlen(domain);
char reply[domainLen + 7];
reply[0] = 5; // version
reply[1] = 0; // succed
reply[2] = 0; // reserved
reply[3] = 3; // its a domain
reply[4] = domainLen;; // lenght of domain
for(int j = 0; j < domainLen; ++j)
{
reply[j + 5] = domain[j];
}
reply[5 + domainLen] = 80; // port
reply[20] = '�';
Send(reply, sizeof(reply));
domain is "www.google.com". Am I doing it right ? I dont know much about bits.
There is a transient bug in my code which I just can't catch.
The basic idea is this. I have a multithreaded server and two thread pools, the IO pool and Worker pool. The main server thread listens to incoming connections. When it gets one, it dispatches a thread from the IO pool to read the socket. An IO thread reads the socket. If there is data, it invokes a thread from the Worker pool. This thread then finishes off the processing including closing the socket. The code follows.
Before I show the code, let me tell you what's happening when I am testing it. I have a client program which has about 30 threads, each opening a separate socket connection with the server. Each sends a request which the server responds to. Sometimes I have all the threads finish in a zip. Sometimes both the client and the server hangs. And yet at other times, the client gets a connection refused message.
Now the code. I have omitted some of the nitty-gritties, including possibly variable declarations. I'll post them if it's required.
After my first installation/ version of Ubuntu 64, I performed a netstat and noticed I did NOT have any Active UNIX domain sockets as I do now. After doing some research, I found this is related to MYSQL and server services which I am in no need of running and nor do I want to run if not needed. So exactly what are these services used for, which app is creating this and why?
Is it possible to remove the app or processes if they are not needed? Killing these connections every time they attempt to establish would be rhetorical.
~$ uname -a
Linux panda 2.6.32-24-generic #38-Ubuntu SMP Mon Jul 5 09:20:59 UTC 2010 x86_64 GNU/Linux
:~$ netstat | more
Active Internet connections (w/o servers)
[Code].....
I am doing a project where 2 clients connect to server and communicate (chat) and transfer data one after other using sockets. I have working code for this in C language. Now our main aim is to create a communication link where two clients transfer multiple streams data parallely. To be more precise i want to transfer images files and audio files parallel at same time, so is it possible to send data parallel using one socket connection?
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