移植vsftpd到arm linux

vsftpd即very secure FTP daemon（非常安全的FTP进程），是一个基于GPL发布的类UNIX类操作系统上运行的服务器的名字（是一种守护进程），可以运行在诸如Linux、BSD、Solaris、HP-UX以及Irix等系统上面。vsftpd支持很多其他传统的FTP服务器不支持的良好特性。使用 vsftpd 可以在 Linux/Unix 系统上搭建一个安全、高性能、稳定性好的轻量级FTP服务器。

现在基于quectel的EC20CEFAG模块，来移植vsftpd服务。

1 下载

下载最新版本源码包，下载地址：https://security.appspot.com/vsftpd.html#download。本文以 vsftpd-3.0.2.tar.gz 版本为例。

如果以上下载地址无法访问，也可以本地下载vsftpd-3.0.2.tar.gz。

2 解压

$ mkdir ~/vsftpd
$ cp vsftpd-3.0.2.tar.gz ~/vsftpd
$ cd ~/vsftpd
$ tar xzf vsftpd-3.0.2.tar.gz
$ cd vsftpd-3.0.2/

3 配置

修改Makefile文件：

CC = arm-oe-linux-gnueabi-gcc

4 设置交叉编译环境&编译

$ source ../../ql-ol-crosstool/ql-ol-crosstool-env-init

$ make

sysdeputil.o:sysdeputil.c:function vsf_sysdep_has_capabilities: error: undefined reference to 'cap_get_proc'
sysdeputil.o:sysdeputil.c:function vsf_sysdep_has_capabilities: error: undefined reference to 'cap_free'
sysdeputil.o:sysdeputil.c:function vsf_sysdep_adopt_capabilities: error: undefined reference to 'cap_init'
sysdeputil.o:sysdeputil.c:function vsf_sysdep_adopt_capabilities: error: undefined reference to 'cap_set_proc'
sysdeputil.o:sysdeputil.c:function vsf_sysdep_adopt_capabilities: error: undefined reference to 'cap_free'
sysdeputil.o:sysdeputil.c:function vsf_sysdep_adopt_capabilities: error: undefined reference to 'cap_set_flag'
sysdeputil.o:sysdeputil.c:function vsf_sysdep_adopt_capabilities: error: undefined reference to 'cap_set_flag'
sysdeputil.o:sysdeputil.c:function vsf_sysdep_adopt_capabilities: error: undefined reference to 'cap_set_flag'
sysdeputil.o:sysdeputil.c:function vsf_sysdep_adopt_capabilities: error: undefined reference to 'cap_set_flag'
collect2: error: ld returned  exit status
Makefile:: recipe for target 'vsftpd' failed
make: *** [vsftpd] Error 

编译报错，修改Makefile文件，在CC 后面添加“ -lcap ”

 27 .c.o:
          $(CC) -c $*.c $(CFLAGS) $(IFLAGS) -lcap
          #$(CC) -c $*.c $(CFLAGS) $(IFLAGS)
 
  vsftpd: $(OBJS)
          $(CC) -o vsftpd $(OBJS) $(LINK) $(LDFLAGS) $(LIBS) -lcap
          #$(CC) -o vsftpd $(OBJS) $(LINK) $(LDFLAGS) $(LIBS)

make 后，当前目录下会生成两个文件：vsftpd 和 vsftpd.conf，这两个文件是我们要用的。

5 复制文件

将生成的 vsftpd 复制到目标板 /usr/sbin 目录，vsftpd.conf 复制到目标板 /etc 目录，并添加 vsftpd 为可执行：

$ cp vsftpd ql-ol-sdk/ql-ol-rootfs/usr/sbin                       # 复制执行文件到目标板
$ cp vsftpd.conf ql-ol-sdk/ql-ol-rootfs/etc/                      # 复制配置文件到目标板
$ chmod +x ql-ol-sdk/ql-ol-rootfs/usr/sbin/vsftpd                 # 添加可执行权限

6 配置

使用 vi 打开 vsftpd.conf 文件，并进行配置，如下配置可实现正常上传下载功能：（这段可以随便改)

# Example config file /etc/vsftpd.conf
#
# The default compiled in settings are fairly paranoid. This sample file
# loosens things up a bit, to make the ftp daemon more usable.
# Please see vsftpd.conf.5 for all compiled in defaults.
#
# READ THIS: This example file is NOT an exhaustive list of vsftpd options.
# Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's
# capabilities.
#
# Allow anonymous FTP? (Beware - allowed by default if you comment this out).
anonymous_enable=YES
#
# Uncomment this to allow local users to log in.
local_enable=YES
#
# Uncomment this to enable any form of FTP write command.
# 允许登录的FTP用户写权限，还要视目录的权限而定
write_enable=YES

pam_service_name=vsftpd
#
# Default umask for local users is 077. You may wish to change this to 022,
# if your users expect that (022 is used by most other ftpd's)
#local_umask=022
anon_umask=0000
file_open_mode=0777
#
# Uncomment this to allow the anonymous FTP user to upload files. This only
# has an effect if the above global write enable is activated. Also, you will
# obviously need to create a directory writable by the FTP user.
# 允许匿名用户上传文件
anon_upload_enable=YES
#
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories.
# 允许匿名用户创建目录
anon_mkdir_write_enable=YES
# 允许匿名用户进行删除或者改名等操作
anon_other_write_enable=YES
# 指定匿名用户登录后的主目录为/data/software目录
#anon_root=/data/software
#
# Activate directory messages - messages given to remote users when they
# go into a certain directory.
dirmessage_enable=YES
#
# Activate logging of uploads/downloads.
xferlog_enable=YES
#
# Make sure PORT transfer connections originate from port 20 (ftp-data).
connect_from_port_20=YES
#
# If you want, you can arrange for uploaded anonymous files to be owned by
# a different user. Note! Using "root" for uploaded files is not
# recommended!
#chown_uploads=YES
#chown_username=whoever
#
# You may override where the log file goes if you like. The default is shown
# below.
xferlog_file=/var/log/vsftpd.log
#
# If you want, you can have your log file in standard ftpd xferlog format.
# Note that the default log file location is /var/log/xferlog in this case.
#xferlog_std_format=YES
#
# You may change the default value for timing out an idle session.
#idle_session_timeout=600
#
# You may change the default value for timing out a data connection.
#data_connection_timeout=120
#
# It is recommended that you define on your system a unique user which the
# ftp server can use as a totally isolated and unprivileged user.
#nopriv_user=ftpsecure
#
# Enable this and the server will recognise asynchronous ABOR requests. Not
# recommended for security (the code is non-trivial). Not enabling it,
# however, may confuse older FTP clients.
#async_abor_enable=YES
#
# By default the server will pretend to allow ASCII mode but in fact ignore
# the request. Turn on the below options to have the server actually do ASCII
# mangling on files when in ASCII mode.
# Beware that on some FTP servers, ASCII support allows a denial of service
# attack (DoS) via the command "SIZE /big/file" in ASCII mode. vsftpd
# predicted this attack and has always been safe, reporting the size of the
# raw file.
# ASCII mangling is a horrible feature of the protocol.
#ascii_upload_enable=YES
#ascii_download_enable=YES
#
# You may fully customise the login banner string:
ftpd_banner=Welcome to LSDDM-AMR1808-B4 FTP service.
#
# You may specify a file of disallowed anonymous e-mail addresses. Apparently
# useful for combatting certain DoS attacks.
#deny_email_enable=YES
# (default follows)
#banned_email_file=/etc/vsftpd.banned_emails
#
# You may specify an explicit list of local users to chroot() to their home
# directory. If chroot_local_user is YES, then this list becomes a list of
# users to NOT chroot().
#chroot_local_user=YES
#chroot_list_enable=YES
# (default follows)
#chroot_list_file=/etc/vsftpd.chroot_list
#
# You may activate the "-R" option to the builtin ls. This is disabled by
# default to avoid remote users being able to cause excessive I/O on large
# sites. However, some broken FTP clients such as "ncftp" and "mirror" assume
# the presence of the "-R" option, so there is a strong case for enabling it.
#ls_recurse_enable=YES
#
# When "listen" directive is enabled, vsftpd runs in standalone mode and
# listens on IPv4 sockets. This directive cannot be used in conjunction
# with the listen_ipv6 directive.
listen=YES
#
# This directive enables listening on IPv6 sockets. To listen on IPv4 and IPv6
# sockets, you must run two copies of vsftpd with two configuration files.
# Make sure, that one of the listen options is commented !!
#listen_ipv6=YES
# 指定匿名用户，默认为ftp
ftp_username=ftp

$ adduser nobody                    # vsftpd默认配置需要
$ mkdir  ql-ol-sdk/ql-ol-rootfs/usr/share/empty            # vsftpd默认配置需要

再在目标版上使用命令配置：

创建一个本地用户，并设置密码：

$ adduser root
Changing password for root
New password:
Retype password:
Password for ftpadmin changed by root

7 打开vsftp

配置完之后，在目标板上打开vsftp，命令：

# /usr/sbin/vsftpd &

注意，后面还有一个 &。如果要让 vsftpd 开机启动，可以将该命令添加到 /etc/profile 或者 rc.local 文件最后。

8 客户端测试

C:\Users\ricks>ftp
ftp> open 192.168.31.45
连接到 192.168.31.45。
 Welcome to EC20 FTP service.
 Always in UTF8 mode.
用户(192.168.31.45:(none)): root
 Please specify the password.
密码:
 Login successful.

待续。。。