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/*
** ATOP - System & Process Monitor
**
** The program 'atop' offers the possibility to view the activity of
** the system on system-level as well as process-level.
**
** This source-file contains functions to interface with the netatop-bpf
** in the kernel. This keeps track of network activity per process
** and thread, and exited process.
** ================================================================
** Author: Ting Liu
** E-mail: liuting.0xffff@bytedance.com
** Date: 2023
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 2, or (at your option) any
** later version.
**
** This program is distributed in the hope that it will be useful, but
** WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
** See the GNU General Public License for more details.
*/
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
#include <zlib.h>
#include <sys/mman.h>
#include <glib.h>
#include <inttypes.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "atop.h"
#include "photoproc.h"
#include "netatop.h"
static int netsock = -1;
static void fill_networkcnt(struct tstat *, struct tstat *,
struct taskcount *);
void my_handler(int);
int len;
struct sockaddr_un un;
/*
** create a UNIX domain stream socket and
** connect the netatop-bpf userspace program
*/
void
netatop_bpf_ipopen(void)
{
char *name = NETATOPBPF_SOCKET;
/* create a UNIX domain stream socket */
if((netsock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
return;
/* fill socket address structure with server's address */
memset(&un, 0, sizeof(un));
un.sun_family = AF_UNIX;
strcpy(un.sun_path, name);
len = offsetof(struct sockaddr_un, sun_path) + strlen(name);
if(connect(netsock, (struct sockaddr *)&un, len) < 0)
{
close(netsock);
return;
}
supportflags |= NETATOPBPF;
return;
}
/*
** check if at this moment the netatop-bpf is loaded
*/
void
netatop_bpf_probe(void)
{
/*
** check if netsock is not connect.
** if not, try to connect again.
*/
if (!(supportflags & NETATOPBPF)) {
char *name = NETATOPBPF_SOCKET;
if (!access(name,F_OK)) {
netatop_bpf_ipopen();
}
}
}
void my_handler (int param)
{
supportflags &= ~NETATOPBPF;
close(netsock);
netsock = -1;
}
/* the NET hash function */
GHashTable *ghash_net;
void
netatop_bpf_gettask()
{
int ret;
struct netpertask npt;
ghash_net = g_hash_table_new_full(g_int_hash, g_int_equal, g_free, g_free);
/*
** get statistics of this process/thread
*/
signal(SIGPIPE, my_handler);
if (send(netsock, &npt, sizeof(npt), 0) < 0) {
supportflags &= ~NETATOPBPF;
close(netsock);
netsock = -1;
return;
}
while ((ret = recv(netsock, &npt, sizeof(npt), 0)) > 0) {
if (npt.id == 0) {
break;
}
gint *key = g_new(gint, 1);
*key = npt.id;
struct taskcount *value = g_new(struct taskcount, 1);
*value = npt.tc;
g_hash_table_insert(ghash_net, key, value);
}
if (ret <= 0) {
supportflags &= ~NETATOPBPF;
close(netsock);
netsock = -1;
return ;
}
}
/*
** search for relevant exited network task and
** update counters in tstat struct
*/
void
netatop_bpf_exitfind(unsigned long key, struct tstat *dev, struct tstat *pre)
{
struct taskcount *tc = g_hash_table_lookup(ghash_net, &key);
/*
** correct PID found
*/
if (tc) {
if (tc->tcpsndpacks < pre->net.tcpsnd ||
tc->tcpsndbytes < pre->net.tcpssz ||
tc->tcprcvpacks < pre->net.tcprcv ||
tc->tcprcvbytes < pre->net.tcprsz ||
tc->udpsndpacks < pre->net.udpsnd ||
tc->udpsndbytes < pre->net.udpssz ||
tc->udprcvpacks < pre->net.udprcv ||
tc->udprcvbytes < pre->net.udprsz )
return;
fill_networkcnt(dev, pre, tc);
}
}
static void
fill_networkcnt(struct tstat *dev, struct tstat *pre, struct taskcount *tc)
{
dev->net.tcpsnd = tc->tcpsndpacks - pre->net.tcpsnd;
dev->net.tcpssz = tc->tcpsndbytes - pre->net.tcpssz;
dev->net.tcprcv = tc->tcprcvpacks - pre->net.tcprcv;
dev->net.tcprsz = tc->tcprcvbytes - pre->net.tcprsz;
dev->net.udpsnd = tc->udpsndpacks - pre->net.udpsnd;
dev->net.udpssz = tc->udpsndbytes - pre->net.udpssz;
dev->net.udprcv = tc->udprcvpacks - pre->net.udprcv;
dev->net.udprsz = tc->udprcvbytes - pre->net.udprsz;
}
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