bpftrace能幫我們干什么？1、統計 tcp連接的生命時長、2、統計mysql執行一條sql語句的時間3、統計redis執行命令的時間、 4、對文件進行一次讀或者寫的時間。

常用命令：

bpftrace -e 'Begin { printf("hello\n"); }'

bpftrace -l '*enter_accept*'

bpftrace -e 'tracepoint:syscalls:sys_enter_accept{ printf("accept\n"); }'

bpftrace -e 'tracepoint:syscalls:sys_enter_accept{ printf("accept %s\n", comm); }'

bpftrace -e 'tracepoint:syscalls:sys_enter_accept / comm == "networkio" / { printf("accept %s\n", comm); }'

bpftrace -e 't:syscalls:sys_enter_connect { printf("connect\n"); }'

Bpftrace -e 'kprobe:tcp_connect {printf("tcp_connect \n"); }'

bpftrace實現：獲取到每一個連接的源IP、源端口、目的ip、目的端口 。執行方式bpftrace tcp_connect.bt

#include <net/sock.h>
#include <linux/socket.h>BEGIN
{printf("Enter tcp_connect Case \n");printf("%8s %6s %16s", "TIME", "PID", "COMM");printf("%19s:%5s  %16s:%5s\n", "SADDR", "SPORT", "DADDR", "DPORT");
}kprobe:tcp_connect 
{$sk = (struct sock*)arg0;$inet_family = $sk->__sk_common.skc_family;if ($inet_family == AF_INET) {$daddr = ntop($sk->__sk_common.skc_daddr);$saddr = ntop($sk->__sk_common.skc_rcv_saddr);}$dport = $sk->__sk_common.skc_dport;$lport = $sk->__sk_common.skc_num;$dport = bswap($dport);time("%H:%M:%S ");printf("%6d %16s", pid, comm);printf("%19s:%5d  %16s:%5d\n", $saddr, $lport, $daddr, $dport);}END
{printf("Exit tcp_connect Case \n");
}

tcp_accept.bt

#include <net/sock.h>
#include <linux/socket.h>BEGIN
{printf("%8s %6s %16s", "TIME", "PID", "COMM");printf("%19s:%5s  %16s:%5s\n", "SADDR", "SPORT", "DADDR", "DPORT");
}kretprobe:inet_csk_accept 
{$sk = (struct sock*)retval;$inet_family = $sk->__sk_common.skc_family;if ($inet_family == AF_INET) {$daddr = ntop($sk->__sk_common.skc_daddr);$saddr = ntop($sk->__sk_common.skc_rcv_saddr);}$dport = $sk->__sk_common.skc_dport;$lport = $sk->__sk_common.skc_num;$dport = bswap($dport);time("%H:%M:%S ");printf("%6d %16s", pid, comm);printf("%19s:%5d  %16s:%5d\n", $saddr, $lport, $daddr, $dport);        }END
{printf("END\n");
}

tcp_life.bt tcp統計生命周期

#include <net/sock.h>
#include <linux/socket.h>BEGIN
{printf("%8s %6s %16s", "TIME", "PID", "COMM");printf("%19s:%5s  %16s:%5s %s\n", "SADDR", "SPORT", "DADDR", "DPORT", "DURms");
}kprobe:tcp_set_state
{$sk = (struct sock*)arg0;$newstate = arg1;if ($newstate <= TCP_SYN_RECV) { // begin@birth[$sk] = nsecs;}if ($newstate == TCP_CLOSE ) { // end$dur = (nsecs - @birth[$sk]) / 1e6;$inet_family = $sk->__sk_common.skc_family;if ($inet_family == AF_INET) {$daddr = ntop($sk->__sk_common.skc_daddr);$saddr = ntop($sk->__sk_common.skc_rcv_saddr);}$dport = $sk->__sk_common.skc_dport;$lport = $sk->__sk_common.skc_num;$dport = bswap($dport);time("%H:%M:%S ");printf("%6d %16s", pid, comm);printf("%19s:%5d  %16s:%5d %d\n", $saddr, $lport, $daddr, $dport, $dur);     }
}END
{printf("END\n");
}

nginx.bt

BEGIN
{printf("NGINX\n");
}uprobe:/usr/local/nginx/sbin/nginx:ngx_close_connection 
{printf("ngx_close_connection\n");
}END
{printf("Exit\n");
}

redis.bt

BEGIN
{}uprobe:/home/king/share/redis-7.4.0/src/redis-server:call 
{printf("redis --> call\n");
}END
{}

mysqld.bt

BEGIN
{printf("Tracing MySQL Server\n");printf("%10s %6s %s\n", "TIME(ns)", "PID", "SQL");
}uprobe:/usr/sbin/mysqld:*dispatch_command*
{@start = nsecs;
}uprobe:/usr/sbin/mysqld:*dispatch_command*
/@start/
{$dur = nsecs - @start;printf("%10u %6d %s\n", $dur, pid, str(*arg1));
}END
{printf("Exit\n");
}

malloc.bt

BEGIN
{printf("%10s %16s %s\n", "TYPE", "NAME", "PID");
}uprobe:/lib/x86_64-linux-gnu/libc.so.6:malloc
/ comm == "King" /
{printf("%10s %16s %d\n", "malloc", comm, pid);
}uprobe:/lib/x86_64-linux-gnu/libc.so.6:free
/ comm == "King"/
{        printf("%10s %16s %d\n", "free", comm, pid);
}END
{printf("Exit\n");
}

ntyco.bt

BEGIN
{printf("Tracing NtyCo\n");
}
// 掛載到可執行程序里，具體函數
uprobe:/home/king/share/2404/7.2.1-bpf/NtyCo/nty_server:nty_coroutine_create
{printf("name: %s, pid: %d\n", comm, pid);
}END
{printf("Exit\n");
}

參考連接：https://github.com/0voice