每天多一点
  • 2 Jul, 2021

    Openssl Check Https Server Cert 

    echo | openssl s_client -servername www.example.com -connect www.example.com:443 2>/dev/null | openssl x509 -text
  • 27 Jun, 2021

    Saisai

    今天去逛了野生动物园，看完大象，差不多逛到一半的时候，赛赛终于在撑不住了，在电动车上睡着了。

  • 26 Jun, 2021

    Saisai

    今天妈妈哄睡的时候，听见赛赛在房间里面大哭了起来，我打开门进去看，赛赛自己爬下床，然后噔噔噔噔跑出去，跑去爷爷房间自己伸手把门开开找爷爷去了。

  • 21 Jun, 2021

    Golang Mod Replace

    golang mod 里面的 replace 语法和应用简单学习一下。

    语法

    replace module-path [module-version] => replacement-path [replacement-version]

    module-version: 可以用来指定特定的版本，如果不指定，则所有版本都替换

    例子

    例1 换成自己的 fork

    require example.com/othermodule v1.2.3

replace example.com/othermodule => example.com/myfork/othermodule v1.2.3-fixed

    例2 换成其他版本

    require example.com/othermodule v1.2.2

replace example.com/othermodule => example.com/othermodule v1.2.3

    例3 换成本地代码

    require example.com/othermodule v1.2.3

replace example.com/othermodule => ../othermodule

    require example.com/othermodule v1.2.5

replace example.com/othermodule v1.2.5 => ../othermodule
  • 21 Jun, 2021

    Saisai

    早晨迷迷糊糊的觉得赛赛在床上翻。

    我后面算是“彻底”醒了，跟赛赛说了几句话，然后我说“赛赛你去找爷爷吧”，他就自己下床，跑去自己开门，然后出去找爷爷了~

  • 18 Jun, 2021

    Flock 

    (
 flock -n 9 || exit 1
 # ... commands executed under lock ...
) 9>/var/lock/mylockfile
  • 18 Jun, 2021

    Glog No Append Mode

    glog 也没有使用 append 模式打开日志文件，导致第三方 truncate 日志文件之后，glog 还继续原来的 offset 写。

  • 18 May, 2021

    Dns Injection

    从 8.8.8.8 返回了多个 UDP 包。看起来，第一个返回时间太短，TTL 也不对。是不是被污染了？

    [root@VMS160953 ~]# tcpdump -nn -vvvv host 8.8.8.8
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
16:36:18.031876 IP (tos 0x0, ttl 64, id 25326, offset 0, flags [none], proto UDP (17), length 126)
    10.60.225.127.47457 > 8.8.8.8.53: [bad udp cksum 0xfc46 -> 0x6d26!] 55814+ [1au] A? prod-eu-central-1-starport-layer-bucket.s3.eu-central-1.amazonaws.com. ar: . OPT UDPsize=4096 (98)
16:36:18.035181 IP (tos 0x0, ttl 35, id 48898, offset 0, flags [DF], proto UDP (17), length 131)
    8.8.8.8.53 > 10.60.225.127.47457: [udp sum ok] 55814 q: A? prod-eu-central-1-starport-layer-bucket.s3.eu-central-1.amazonaws.com. 1/0/0 prod-eu-central-1-starport-layer-bucket.s3.eu-central-1.amazonaws.com. [3m16s] A 104.244.46.186 (103)
16:36:18.035199 IP (tos 0x0, ttl 29, id 0, offset 0, flags [none], proto UDP (17), length 131)
    8.8.8.8.53 > 10.60.225.127.47457: [udp sum ok] 55814 q: A? prod-eu-central-1-starport-layer-bucket.s3.eu-central-1.amazonaws.com. 1/0/0 prod-eu-central-1-starport-layer-bucket.s3.eu-central-1.amazonaws.com. [1m51s] A 4.78.139.54 (103)
16:36:18.271586 IP (tos 0x0, ttl 94, id 28433, offset 0, flags [none], proto UDP (17), length 163)
    8.8.8.8.53 > 10.60.225.127.47457: [udp sum ok] 55814 q: A? prod-eu-central-1-starport-layer-bucket.s3.eu-central-1.amazonaws.com. 2/0/1 prod-eu-central-1-starport-layer-bucket.s3.eu-central-1.amazonaws.com. [33s] CNAME s3-r-w.eu-central-1.amazonaws.com., s3-r-w.eu-central-1.amazonaws.com. [1s] A 52.219.75.128 ar: . OPT UDPsize=512 (135)
16:36:18.271618 IP (tos 0xc0, ttl 64, id 47249, offset 0, flags [none], proto ICMP (1), length 191)
    10.60.225.127 > 8.8.8.8: ICMP 10.60.225.127 udp port 47457 unreachable, length 171
	IP (tos 0x0, ttl 94, id 28433, offset 0, flags [none], proto UDP (17), length 163)
    8.8.8.8.53 > 10.60.225.127.47457: [udp sum ok] 55814 q: A? prod-eu-central-1-starport-layer-bucket.s3.eu-central-1.amazonaws.com. 2/0/1 prod-eu-central-1-starport-layer-bucket.s3.eu-central-1.amazonaws.com. [33s] CNAME s3-r-w.eu-central-1.amazonaws.com., s3-r-w.eu-central-1.amazonaws.com. [1s] A 52.219.75.128 ar: . OPT UDPsize=512 (135)
^C
5 packets captured
5 packets received by filter
0 packets dropped by kernel
[root@VMS160953 ~]# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=95 time=241 ms
^C
--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 241.706/241.706/241.706/0.000 ms
  • 7 May, 2021

    Multiboot Specification

    https://forum.osdev.org/viewtopic.php?t=22481

    /* The magic field should contain this.  */
#define MULTIBOOT2_HEADER_MAGIC         0xe85250d6

  ...

struct multiboot_header
{
  /* Must be MULTIBOOT_MAGIC - see above.  */
  multiboot_uint32_t magic;

  /* Feature flags.  */
  multiboot_uint32_t flags;

  /* The above fields plus this one must equal 0 mod 2^32. */
  multiboot_uint32_t checksum;

  ...
};
  • 7 May, 2021

    Saisai

    这两天都是妈妈带赛赛到小区大门口等着，车开走的时候就哇哇的哭。感觉要努力去银联上班了。。