Nano雞排: 2月 2015

2015年2月27日星期五

OpenEmbedded User Manual - CH3, Writing Meta Data (Adding packages)

如同User manual提的，讓我們從寫package的description跟license開始，我們寫一個brook_1.0.bb開始

description

DESCRIPTION = "Brook's first application"
HOMEPAGE = "http://www.brook.com/oe/"
LICENSE = "Brook-Proprietary"

基本上這些參數都只是描述，也就是字串，至於LICENSE有公用哪些選項，請參考Recipe License Fields。

define dependency

DEPENDS = "gtk+"
RDEPENDS = "cool-ttf-fonts"

DEPENDS是build時需要哪個package，RDEPENDS則是執行時需要哪個package，也就是說如果該brook_1.0被加到image，則RDEPENDS所列的也都會被加到image之中。

source location

SRC_URI = "http://127.0.0.1/brook/${P}.tar.bz2"
SRC_URI[md5sum] = "6abf52e3f874f67bc4663d0986493970"
SRC_URI[sha256sum] = "7aa5130f9648f0948ebaad270a4fe1112e4cc06895580dab85da26baa37fd4f6"

SRC_URI是指定檔案所在的位置，可以支援http、ftp、git、svn、file等，詳情可參考SRC_URI variable，SRC_URI[md5sum]與SRC_URI[sha256sum]是去驗證檔案是否正確，可以透過md5sum file_name與sha256sum file_name算出。當中的${P}=${PN}-${PV}，${PN}是Package Name，${PV}是Package Version。

build system selection

在開始真正build package之前，我們必須決定這個package使用哪個build system，如果這個package需要先執行configure script然後在make，那麼通常就會選用autotools，更多關於autotools class，其他inherit之後再來討論。

到此可以真正開始build brook這個package了，bitbake brook。

完整brook_1.0.bb

DESCRIPTION = "Brook's first application"
HOMEPAGE = "http://www.brook.com/oe/"
LICENSE = "Brook-Proprietary"
LIC_FILES_CHKSUM = "file://COPYING;md5=dcb2a5c2b6d6fea1a0835c08d71ad817"

SRC_URI = "http://127.0.0.1/brook/${P}.tar.bz2"
SRC_URI[md5sum] = "6abf52e3f874f67bc4663d0986493970"
SRC_URI[sha256sum] = "7aa5130f9648f0948ebaad270a4fe1112e4cc06895580dab85da26baa37fd4f6"
inherit autotools

Example of Source Code

brook-1.0/Makefile

all: brook

brook: main.o
 ${CC} $? -o $@
install:
 install -d -m 755 ${DESTDIR}/bin
 install -m 755 brook ${DESTDIR}/bin

brook-1.0/main.c

#include <stdio.h>

int main(int argc, char *argv[])
{
    printf("Hello world, Brook\n");
    return 0;
}

LIC_FILES_CHKSUM does not match

如果出現以下錯誤

ERROR: brook: Recipe file does not have license file information (LIC_FILES_CHKSUM)
ERROR: Licensing Error: LIC_FILES_CHKSUM does not match, please fix

可以在bb file中加入

LIC_FILES_CHKSUM = "file://COPYING;md5=dcb2a5c2b6d6fea1a0835c08d71ad817"

其中COPYING就是LICENSE檔案位置，我是指到source file解開後的COPYING檔案位置與其對應的md5sum。

2015年2月7日星期六

nc — arbitrary TCP and UDP connections and listens

幾乎任何使用 TCP，UDP或UNIX-domain socket的動作都可以用nc來達成，常見的功能如。

simple TCP proxies
shell-script based HTTP clients and servers
network daemon testing
a SOCKS or HTTP ProxyCommand for ssh(1)
and much, much more

SYNOPSIS

     nc [-46bCDdhklnrStUuvZz] [-I length] [-i interval] [-O length]
        [-P proxy_username] [-p source_port]
        [-q seconds] [-s source] [-T toskeyword] [-V rtable]
        [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]]
        [destination] [port]

options: -v, verbose

不加-v，發生錯誤時不會有訊息。

brook@vista:~$ nc 127.0.0.1 12345
brook@vista:~$ nc -v 127.0.0.1 12345
nc: connect to 127.0.0.1 port 12345 (tcp) failed: Connection refused
brook@vista:~$ nc -v 127.0.0.1 80
Connection to 127.0.0.1 80 port [tcp/http] succeeded!
輸入GET / HTTP/1.1
輸入HOST: 127.0.0.1
輸入[enter]
輸入[enter]

HTTP/1.1 200 OK
Date: Tue, 27 Jan 2015 08:24:17 GMT
Server: Apache/2.2.22 (Ubuntu)
Last-Modified: Mon, 23 Dec 2013 04:13:45 GMT
ETag: "1b806ff-b1-4ee2bdaa24ac8"
Accept-Ranges: bytes
Content-Length: 177
Vary: Accept-Encoding
Content-Type: text/html
X-Pad: avoid browser bug

<html><body><h1>It works!</h1>
<p>This is the default web page for this server.</p>
<p>The web server software is running but no content has been added, yet.</p>
</body></html>

options: -l, listen for an incoming connection rather than initiate a connection to a remote host

等同開socket在listen，預設是tcp。

brook@vista:~$ nc -l 127.0.0.1 5000 -> server
brook@vista:~$ netstat -nal | grep 5000
tcp        0      0 127.0.0.1:5000          0.0.0.0:*               LISTEN
brook@vista:~$ nc 127.0.0.1 5000 -> client

options: -u, Use UDP instead of the default option of TCP.

使用UDP取代預設的TCP

brook@vista:~$ nc -lu 127.0.0.1 5000 -> server
brook@vista:~$ nc -u 127.0.0.1 5000 -> client

使用nc當Web Server

{ echo -ne "HTTP/1.0 200 OK\r\nContent-Length: $(wc -c < some.file)\r\n\r\n"; cat some.file; } | nc -l 5050

開啟Browser，http://127.0.0.1:5050/，就可以看到網頁了。

Works as a Port Scanner

brook@vista:~$ nc -v -z 127.0.0.1 80-200 2>&1 | grep -v failed
Connection to 127.0.0.1 80 port [tcp/http] succeeded!
Connection to 127.0.0.1 139 port [tcp/netbios-ssn] succeeded!

Transfering Files

sender
brook@vista:~$ md5sum usb_eth.txt
2367562f85f99fe972b9d6a83ce38099  usb_eth.txt
brook@vista:~$ tar cvf - usb_eth.txt | nc 127.0.0.1 5000
usb_eth.txt

receiver
brook@vista:/tmp$ nc -l 5000 | tar xvf -
usb_eth.txt
brook@vista:/tmp$ md5sum usb_eth.txt
2367562f85f99fe972b9d6a83ce38099  usb_eth.txt

Git Proxy

以下的Script是我拿用當gitproxy用的

#!/bin/bash
# http://tech-tacolin.blogspot.tw/2013/04/git-http-proxy.html
PROXY=1.2.3.4
PROXYPORT=3128
case $1 in
    192.168.1.1 | internal-ip)
        nc -X connect $*
        ;;
    *)
        nc -x $PROXY:$PROXYPORT -X connect $*
        ;;
esac

Netcat WIKI
Netcat（Linux nc 指令）網路管理者工具實用範例

Nano雞排

2015年2月27日星期五

OpenEmbedded User Manual - CH3, Writing Meta Data (Adding packages)

description

define dependency

source location

build system selection

完整brook_1.0.bb

Example of Source Code

LIC_FILES_CHKSUM does not match

2015年2月7日星期六

nc — arbitrary TCP and UDP connections and listens

options: -v, verbose

options: -l, listen for an incoming connection rather than initiate a connection to a remote host

options: -u, Use UDP instead of the default option of TCP.

使用nc當Web Server

Works as a Port Scanner

Transfering Files

Git Proxy

熱門文章

關於我自己

網誌存檔

搜尋此網誌

標籤

Nano雞排

2015年2月27日 星期五

OpenEmbedded User Manual - CH3, Writing Meta Data (Adding packages)

description

define dependency

source location

build system selection

完整brook_1.0.bb

Example of Source Code

LIC_FILES_CHKSUM does not match

2015年2月7日 星期六

nc — arbitrary TCP and UDP connections and listens

options: -v, verbose

options: -l, listen for an incoming connection rather than initiate a connection to a remote host

options: -u, Use UDP instead of the default option of TCP.

使用nc當Web Server

Works as a Port Scanner

Transfering Files

Git Proxy

熱門文章

關於我自己

網誌存檔

搜尋此網誌

標籤

2015年2月27日星期五

2015年2月7日星期六