xref: /freebsd-9.3-release/cddl/contrib/dtracetoolkit/Net/tcpsnoop.d

#!/usr/sbin/dtrace -Cs
/*
 * tcpsnoop.d - snoop TCP network packets by process.
 *              Written using DTrace (Solaris 10 3/05)
 *
 * This analyses TCP network packets and prints the responsible PID and UID,
 * plus standard details such as IP address and port. This captures traffic
 * of newly created TCP connections that were established while this program
 * was running. It can help identify which processes is causing TCP traffic.
 *
 * WARNING: This script may only work on Solaris 10 3/05, since it uses the
 * fbt provider to trace the raw operation of a specific version of the kernel.
 * In the future, a 'stable' network provider should exist which will allow
 * this to be written for that and subsequent versions of the kernel. In the
 * meantime, check for other versions of this script in the /Net directory,
 * and read the Notes/ALLfbt_notes.txt for more background on fbt.
 *
 * $Id: tcpsnoop.d 69 2007-10-04 13:40:00Z brendan $
 *
 * USAGE:       tcpsnoop.d
 *
 * FIELDS:
 *		UID     	user ID
 *		PID     	process ID
 *		CMD     	command
 *		LADDR		local IP address
 *		RADDR		remote IP address
 *		LPORT		local port number
 *		RPORT		remote port number
 *		DR      	direction
 *		SIZE    	packet size, bytes
 *
 * SEE ALSO: snoop -rS
 *
 * COPYRIGHT: Copyright (c) 2005, 2006 Brendan Gregg.
 *
 * CDDL HEADER START
 *
 *  The contents of this file are subject to the terms of the
 *  Common Development and Distribution License, Version 1.0 only
 *  (the "License").  You may not use this file except in compliance
 *  with the License.
 *
 *  You can obtain a copy of the license at Docs/cddl1.txt
 *  or http://www.opensolaris.org/os/licensing.
 *  See the License for the specific language governing permissions
 *  and limitations under the License.
 *
 * CDDL HEADER END
 *
 * Author: Brendan Gregg  [Sydney, Australia]
 *
 * TODO: IPv6
 *
 * 09-Jul-2004  Brendan Gregg   Created this.
 * 12-Mar-2005     "      "	Changed probes, size info now printed.
 * 02-Jul-2005     "      "	Many more probes. Renamed "tcpsnoop.d".
 * 03-Dec-2005	   "	  "	Fixed tcp_accept_finish bug, now 100% correct
 *				execname. Thanks Kias Belgaied for expertise.
 * 20-Apr-2006	   "	  "	Fixed SS_TCP_FAST_ACCEPT bug in build 31+.
 * 20-Apr-2006	   "	  "	Last update.
 */

#pragma D option quiet
#pragma D option switchrate=10hz

#include <sys/file.h>
#include <inet/common.h>
#include <sys/byteorder.h>

/*
 * Print header
 */
dtrace:::BEGIN
{
	/* print main headers */
	printf("%5s %6s %-15s %5s %2s %-15s %5s %5s %s\n",
	    "UID", "PID", "LADDR", "LPORT", "DR", "RADDR", "RPORT",
	    "SIZE", "CMD");
}

/*
 * TCP Process inbound connections
 *
 * 0x00200000 has been hardcoded. It was SS_TCP_FAST_ACCEPT, but was
 * renamed to SS_DIRECT around build 31.
 */
fbt:sockfs:sotpi_accept:entry
/(arg1 & FREAD) && (arg1 & FWRITE) && (args[0]->so_state & 0x00200000)/
{
	self->sop = args[0];
}

fbt:sockfs:sotpi_create:return
/self->sop/
{
	self->nsop = (struct sonode *)arg1;
}

fbt:sockfs:sotpi_accept:return
/self->nsop/
{
	this->tcpp = (tcp_t *)self->nsop->so_priv;
	self->connp = (conn_t *)this->tcpp->tcp_connp;
	tname[(int)self->connp] = execname;
	tpid[(int)self->connp] = pid;
	tuid[(int)self->connp] = uid;
}

fbt:sockfs:sotpi_accept:return
{
	self->nsop = 0;
	self->sop = 0;
}

/*
 * TCP Process outbound connections
 */
fbt:ip:tcp_connect:entry
{
	this->tcpp = (tcp_t *)arg0;
	self->connp = (conn_t *)this->tcpp->tcp_connp;
	tname[(int)self->connp] = execname;
	tpid[(int)self->connp] = pid;
	tuid[(int)self->connp] = uid;
}

/*
 * TCP Data translations
 */
fbt:sockfs:sotpi_accept:return,
fbt:ip:tcp_connect:return
/self->connp/
{
	/* fetch ports */
#if defined(_BIG_ENDIAN)
	self->lport = self->connp->u_port.tcpu_ports.tcpu_lport;
	self->fport = self->connp->u_port.tcpu_ports.tcpu_fport;
#else
	self->lport = BSWAP_16(self->connp->u_port.tcpu_ports.tcpu_lport);
	self->fport = BSWAP_16(self->connp->u_port.tcpu_ports.tcpu_fport);
#endif

	/* fetch IPv4 addresses */
	this->fad12 =
	    (int)self->connp->connua_v6addr.connua_faddr._S6_un._S6_u8[12];
	this->fad13 =
	    (int)self->connp->connua_v6addr.connua_faddr._S6_un._S6_u8[13];
	this->fad14 =
	    (int)self->connp->connua_v6addr.connua_faddr._S6_un._S6_u8[14];
	this->fad15 =
	    (int)self->connp->connua_v6addr.connua_faddr._S6_un._S6_u8[15];
	this->lad12 =
	    (int)self->connp->connua_v6addr.connua_laddr._S6_un._S6_u8[12];
	this->lad13 =
	    (int)self->connp->connua_v6addr.connua_laddr._S6_un._S6_u8[13];
	this->lad14 =
	    (int)self->connp->connua_v6addr.connua_laddr._S6_un._S6_u8[14];
	this->lad15 =
	    (int)self->connp->connua_v6addr.connua_laddr._S6_un._S6_u8[15];

	/* convert type for use with lltostr() */
	this->fad12 = this->fad12 < 0 ? 256 + this->fad12 : this->fad12;
	this->fad13 = this->fad13 < 0 ? 256 + this->fad13 : this->fad13;
	this->fad14 = this->fad14 < 0 ? 256 + this->fad14 : this->fad14;
	this->fad15 = this->fad15 < 0 ? 256 + this->fad15 : this->fad15;
	this->lad12 = this->lad12 < 0 ? 256 + this->lad12 : this->lad12;
	this->lad13 = this->lad13 < 0 ? 256 + this->lad13 : this->lad13;
	this->lad14 = this->lad14 < 0 ? 256 + this->lad14 : this->lad14;
	this->lad15 = this->lad15 < 0 ? 256 + this->lad15 : this->lad15;

	/* stringify addresses */
	self->faddr = strjoin(lltostr(this->fad12), ".");
	self->faddr = strjoin(self->faddr, strjoin(lltostr(this->fad13), "."));
	self->faddr = strjoin(self->faddr, strjoin(lltostr(this->fad14), "."));
	self->faddr = strjoin(self->faddr, lltostr(this->fad15 + 0));
	self->laddr = strjoin(lltostr(this->lad12), ".");
	self->laddr = strjoin(self->laddr, strjoin(lltostr(this->lad13), "."));
	self->laddr = strjoin(self->laddr, strjoin(lltostr(this->lad14), "."));
	self->laddr = strjoin(self->laddr, lltostr(this->lad15 + 0));

	/* fix direction and save values */
	tladdr[(int)self->connp] = self->laddr;
	tfaddr[(int)self->connp] = self->faddr;
	tlport[(int)self->connp] = self->lport;
	tfport[(int)self->connp] = self->fport;

	/* all systems go */
	tok[(int)self->connp] = 1;
}

/*
 * TCP Clear connp
 */
fbt:ip:tcp_get_conn:return
{
	/* Q_TO_CONN */
	this->connp = (conn_t *)arg1;
	tok[(int)this->connp] = 0;
	tpid[(int)this->connp] = 0;
	tuid[(int)this->connp] = 0;
	tname[(int)this->connp] = 0;
}

/*
 * TCP Process "port closed"
 */
fbt:ip:tcp_xmit_early_reset:entry
{
	this->queuep = (queue_t *)`tcp_g_q; /* ` */
	this->connp = (conn_t *)this->queuep->q_ptr;
	this->tcpp = (tcp_t *)this->connp->conn_tcp;

	/* split addresses */
	this->ipha = (ipha_t *)args[1]->b_rptr;
	this->fad15 = (this->ipha->ipha_src & 0xff000000) >> 24;
	this->fad14 = (this->ipha->ipha_src & 0x00ff0000) >> 16;
	this->fad13 = (this->ipha->ipha_src & 0x0000ff00) >> 8;
	this->fad12 = (this->ipha->ipha_src & 0x000000ff);
	this->lad15 = (this->ipha->ipha_dst & 0xff000000) >> 24;
	this->lad14 = (this->ipha->ipha_dst & 0x00ff0000) >> 16;
	this->lad13 = (this->ipha->ipha_dst & 0x0000ff00) >> 8;
	this->lad12 = (this->ipha->ipha_dst & 0x000000ff);

	/* stringify addresses */
	self->faddr = strjoin(lltostr(this->fad12), ".");
	self->faddr = strjoin(self->faddr, strjoin(lltostr(this->fad13), "."));
	self->faddr = strjoin(self->faddr, strjoin(lltostr(this->fad14), "."));
	self->faddr = strjoin(self->faddr, lltostr(this->fad15 + 0));
	self->laddr = strjoin(lltostr(this->lad12), ".");
	self->laddr = strjoin(self->laddr, strjoin(lltostr(this->lad13), "."));
	self->laddr = strjoin(self->laddr, strjoin(lltostr(this->lad14), "."));
	self->laddr = strjoin(self->laddr, lltostr(this->lad15 + 0));

	self->reset = 1;
}

/*
 * TCP Fetch "port closed" ports
 */
fbt:ip:tcp_xchg:entry
/self->reset/
{
#if defined(_BIG_ENDIAN)
	self->lport = (uint16_t)arg0;
	self->fport = (uint16_t)arg1;
#else
	self->lport = BSWAP_16((uint16_t)arg0);
	self->fport = BSWAP_16((uint16_t)arg1);
#endif
	self->lport = BE16_TO_U16(arg0);
	self->fport = BE16_TO_U16(arg1);
}

/*
 * TCP Print "port closed"
 */
fbt:ip:tcp_xmit_early_reset:return
{
	self->name = "<closed>";
	self->pid = 0;
	self->uid = 0;
	self->size = 54;	/* should check trailers */
	self->dir = "<-";
	printf("%5d %6d %-15s %5d %2s %-15s %5d %5d %s\n",
	    self->uid, self->pid, self->laddr, self->lport, self->dir,
	    self->faddr, self->fport, self->size, self->name);
	self->dir = "->";
	printf("%5d %6d %-15s %5d %2s %-15s %5d %5d %s\n",
	    self->uid, self->pid, self->laddr, self->lport, self->dir,
	    self->faddr, self->fport, self->size, self->name);
	self->reset = 0;
	self->size = 0;
	self->name = 0;
}

/*
 * TCP Process Write
 */
fbt:ip:tcp_send_data:entry
{
	self->conn_p = (conn_t *)args[0]->tcp_connp;
}

fbt:ip:tcp_send_data:entry
/tok[(int)self->conn_p]/
{
	self->dir = "->";
	self->size = msgdsize(args[2]) + 14;	/* should check trailers */
	self->uid = tuid[(int)self->conn_p];
	self->laddr = tladdr[(int)self->conn_p];
	self->faddr = tfaddr[(int)self->conn_p];
	self->lport = tlport[(int)self->conn_p];
	self->fport = tfport[(int)self->conn_p];
	self->ok = 2;

	/* follow inetd -> in.* transitions */
	self->name = pid && (tname[(int)self->conn_p] == "inetd") ?
	    execname : tname[(int)self->conn_p];
	self->pid = pid && (tname[(int)self->conn_p] == "inetd") ?
	    pid : tpid[(int)self->conn_p];
	tname[(int)self->conn_p] = self->name;
	tpid[(int)self->conn_p] = self->pid;
}

/*
 * TCP Process Read
 */
fbt:ip:tcp_rput_data:entry
{
	self->conn_p = (conn_t *)arg0;
	self->size = msgdsize(args[1]) + 14;	/* should check trailers */
}

fbt:ip:tcp_rput_data:entry
/tok[(int)self->conn_p]/
{
	self->dir = "<-";
	self->uid = tuid[(int)self->conn_p];
	self->laddr = tladdr[(int)self->conn_p];
	self->faddr = tfaddr[(int)self->conn_p];
	self->lport = tlport[(int)self->conn_p];
	self->fport = tfport[(int)self->conn_p];
	self->ok = 2;

	/* follow inetd -> in.* transitions */
	self->name = pid && (tname[(int)self->conn_p] == "inetd") ?
	    execname : tname[(int)self->conn_p];
	self->pid = pid && (tname[(int)self->conn_p] == "inetd") ?
	    pid : tpid[(int)self->conn_p];
	tname[(int)self->conn_p] = self->name;
	tpid[(int)self->conn_p] = self->pid;
}

/*
 * TCP Complete printing outbound handshake
 */
fbt:ip:tcp_connect:return
/self->connp/
{
	self->name = tname[(int)self->connp];
	self->pid = tpid[(int)self->connp];
	self->uid = tuid[(int)self->connp];
	self->size = 54;	/* should check trailers */
	self->dir = "->";
	/* this packet occured before connp was fully established */
	printf("%5d %6d %-15s %5d %2s %-15s %5d %5d %s\n",
	    self->uid, self->pid, self->laddr, self->lport, self->dir,
	    self->faddr, self->fport, self->size, self->name);
}

/*
 * TCP Complete printing inbound handshake
 */
fbt:sockfs:sotpi_accept:return
/self->connp/
{
	self->name = tname[(int)self->connp];
	self->pid = tpid[(int)self->connp];
	self->uid = tuid[(int)self->connp];
	self->size = 54;	/* should check trailers */
	/* these packets occured before connp was fully established */
	self->dir = "<-";
	printf("%5d %6d %-15s %5d %2s %-15s %5d %5d %s\n",
	    self->uid, self->pid, self->laddr, self->lport, self->dir,
	    self->faddr, self->fport, self->size, self->name);
	self->dir = "->";
	printf("%5d %6d %-15s %5d %2s %-15s %5d %5d %s\n",
	    self->uid, self->pid, self->laddr, self->lport, self->dir,
	    self->faddr, self->fport, self->size, self->name);
	self->dir = "<-";
	printf("%5d %6d %-15s %5d %2s %-15s %5d %5d %s\n",
	    self->uid, self->pid, self->laddr, self->lport, self->dir,
	    self->faddr, self->fport, self->size, self->name);
}

/*
 * Print output
 */
fbt:ip:tcp_send_data:entry,
fbt:ip:tcp_rput_data:entry
/self->ok == 2/
{
	/* print output line */
	printf("%5d %6d %-15s %5d %2s %-15s %5d %5d %s\n",
	    self->uid, self->pid, self->laddr, self->lport, self->dir,
	    self->faddr, self->fport, self->size, self->name);
}

/*
 * TCP Clear connect variables
 */
fbt:sockfs:sotpi_accept:return,
fbt:ip:tcp_connect:return
/self->connp/
{
	self->faddr = 0;
	self->laddr = 0;
	self->fport = 0;
	self->lport = 0;
	self->connp = 0;
	self->name = 0;
	self->pid = 0;
	self->uid = 0;
}

/*
 * TCP Clear r/w variables
 */
fbt:ip:tcp_send_data:entry,
fbt:ip:tcp_rput_data:entry
{
	self->ok = 0;
	self->dir = 0;
	self->uid = 0;
	self->pid = 0;
	self->size = 0;
	self->name = 0;
	self->lport = 0;
	self->fport = 0;
	self->laddr = 0;
	self->faddr = 0;
	self->conn_p = 0;
}