Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: VNode to Socket
Operating Systems Solaris VNode to Socket Post 302965310 by mrmoss on Wednesday 27th of January 2016 05:12:21 AM
Old 01-27-2016
VNode to Socket
I'm trying to list all open sockets and their PIDs on Solaris 10 in C++.

In Solaris 11, they made this really simple by adding the PID to the mib structs (example, tcpConnCreationProcess in inet/mib2.h). This functionality isn't in Solaris 10, and can be seen in the new netstat source code.

In Solaris 10, I'm trying to use the KVM interface to get this information. Now I have the exact opposite problem where I can get the PIDs and fds without a problem, but getting the actual socket seems to be difficult.

According to some reading, the vnode struct contains the socket object (sonode?).

Is there an easy way to go from where I am to getting the socket information?

Code:
//http://www.solarisinternals.com/si/sample/solaris_internals_ch14_file_system_framework.pdf
//http://www.solarisinternals.com/si/reading/vnode.pdf
//http://www.brendangregg.com/DTrace/socketsnoop.d

//compile with:
//	g++ testing.cpp -lkvm -lelf -lnsl -lsocket -m64

#define	_KMEMUSER 1

#include <kvm.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/file.h>
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/segments.h>
#include <sys/strsubr.h>
#include <unistd.h>
#include <sys/user.h>
#include <sys/vnode.h>

#include <iostream>
#include <stdexcept>

template<typename T> T kernel_get(kvm_t* kd,const T* kernel_pointer)
{
	T temp;

	if(kvm_read(kd,(uintptr_t)kernel_pointer,&temp,sizeof(T))==-1)
		throw std::runtime_error("Error reading from kernel memory.");

	return temp;
}

int main()
{
	char err[4096];
	kvm_t* kd=kvm_open(NULL,NULL,NULL,O_RDONLY,err);

	if(kd==NULL)
	{
		std::cout<<"Could not open kernel virtual memory."<<std::endl;
		return 1;
	}

	while(true)
	{
		proc_t* proc=kvm_nextproc(kd);

		if(proc==NULL)
			break;

		pid_t pid=kernel_get(kd,proc->p_pidp).pid_id;

		user_t* user=&proc->p_user;
		size_t num_entries=user->u_finfo.fi_nfiles;
		size_t socket_count=0;

		for(size_t ii=0;ii<num_entries;++ii)
		{
			uf_entry_t entry=kernel_get(kd,user->u_finfo.fi_list+ii);

			if(entry.uf_file!=NULL)
			{
				file_t file=kernel_get(kd,entry.uf_file);
				vnode_t vnode=kernel_get(kd,file.f_vnode);

				if(vnode.v_type==VSOCK)
				{
					++socket_count;
					//vnode.v_stream? vnode.v_vfsp? vnode.v_data?
				}
			}
		}

		if(socket_count>0)
			std::cout<<pid<<"\t"<<socket_count<<std::endl;
	}

	kvm_close(kd);

	return 0;
}

 

10 More Discussions You Might Find Interesting

1. IP Networking

socket

how to create a socket ? why to bind a socket? when we use a socket? (1 Reply)
Discussion started by: amin
1 Replies

2. Programming

Socket Programming socket

Hello, I actually try to make client-server program. I'm using SCO OpenServer Release 5.0.0 and when I try to compile my code (by TELNET) I've got this error : I'm just using this simple code : and I get the same error if I use : If someone can help me, Thanks (2 Replies)
Discussion started by: soshell
2 Replies

3. UNIX for Dummies Questions & Answers

C socket

I have been serching for a guide to unix C network programming everywhere but I have found only some tuorials, very useful but a little bit poors. My question is if exist a network domain all over the world where C socket is treated with examples. Programs i have looked into is hard to... (4 Replies)
Discussion started by: Davide71
4 Replies

4. IP Networking

IP Socket

Please need to setup a IP Socket on SCO Open Server 5.06 / 5.07 to a Linux machine. Al that I want to do is via a simple shell command open a tcpip address, port number, and send a call to a progam with a name of a file on the linux box. My programming language does not support socket... (1 Reply)
Discussion started by: comcaps
1 Replies

5. UNIX for Advanced & Expert Users

connect problem for sctp socket (ipv6 socket) - Runtime fail Invalid Arguments

Hi, I was porting ipv4 application to ipv6; i was done with TCP transports. Now i am facing problem with SCTp transport at runtime. To test SCTP transport I am using following server and client socket programs. Server program runs fine, but client program fails giving Invalid Arguments for... (0 Replies)
Discussion started by: chandrutiptur
0 Replies

6. Programming

which socket should socket option on be set

Hi all, On the server side, one socket is used for listening, the others are used for communicating with the client. My question is: if i want to set option for socket, which socket should be set on? If either can be set, what's the different? Again, what's the different if set option... (1 Reply)
Discussion started by: blademan100
1 Replies

7. BSD

vnode file access

Hey, I'm new to the bsd kernel and i'm implementing a vop_read function. The problem I'm having is determining 1. Which physical block is being read given the vnode's logical block # 2. How many bytes are being read Any tips are greatly appreciated! (0 Replies)
Discussion started by: JustinT
0 Replies

8. Programming

socket function to read a webpage (socket.h)

Why does this socket function only read the first 1440 chars of the stream. Why not the whole stream ? I checked it with gdm and valgrind and everything seems correct... #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <sys/stat.h> #include <string.h> #include... (3 Replies)
Discussion started by: cyler
3 Replies

9. Programming

Error with socket operation on non-socket

Dear Experts, i am compiling my code in suse 4.1 which is compiling fine, but at runtime it is showing me for socket programming error no 88 as i searched in errno.h it is telling me socket operation on non socket, what is the meaning of this , how to deal with this error , please... (1 Reply)
Discussion started by: vin_pll
1 Replies

10. IP Networking

Clarification - Setting socket options at the same time when socket is listening

I need clarification on whether it is okay to set socket options on a listening socket simultaneously when it is being used in an accept() call? Following is the scenario:- -- Task 1 - is executing in a loop - polling a listen socket, lets call it 'fd', (whose file descriptor is global)... (2 Replies)
Discussion started by: jake24
2 Replies

LEARN ABOUT MOJAVE

kvm_read

kvm_read(3KVM)                                              Kernel VM Library Functions                                             kvm_read(3KVM)

NAME

       kvm_read, kvm_write - copy data to or from a kernel image or running system

SYNOPSIS

       cc [ flag... ] file... -lkvm [ library...]
       #include <kvm.h>

       ssize_t kvm_read(kvm_t *kd, uintptr_t addr, void *buf, size_t nbytes);

       ssize_t kvm_write(kvm_t *kd, uintptr_t addr, void *buf, size_t nbytes);

DESCRIPTION

       The  kvm_read()  function  transfers  data  from the kernel image specified by kd (see kvm_open(3KVM)) to the address space of the process.
       nbytes bytes of data are copied from the kernel virtual address given by addr to the buffer pointed to by buf.

       The kvm_write() function is like kvm_read(), except  that  the  direction  of  data  transfer  is  reversed.  To  use  this  function,  the
       kvm_open(3KVM)  call  that  returned kd must have specified write access. If a user virtual address is given, it is resolved in the address
       space of the process specified in the most recent kvm_getu(3KVM) call.

USAGE

       The kvm_read() and kvm_write() functions are obsolete  and  might  be  removed  in  a  future  release.  The  functions  described  on  the
       kvm_kread(3KVM) manual page should be used instead.

RETURN VALUES

       On success, these functions return the number of bytes actually transferred. On failure, they return -1.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Obsolete                     |
       +-----------------------------+-----------------------------+
       |MT-Level                     |Unsafe                       |
       +-----------------------------+-----------------------------+

SEE ALSO

       kvm_getu(3KVM), kvm_kread(3KVM)kvm_nlist(3KVM), kvm_open(3KVM), attributes(5)

SunOS 5.10                                                          2 May 2002                                                      kvm_read(3KVM)
All times are GMT -4. The time now is 06:06 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy