winsock编写FTP遇到的问题

[insulator]

int logonseq[NUMLOGIN][100] = {
// this array stores all of the logon sequences for the various firewalls
// in blocks of 3 nums. 1st num is command to send, 2nd num is next point in logon sequence array
// if 200 series response is rec'd from server as the result of the command, 3rd num is next
// point in logon sequence if 300 series rec'd
{0,LO,3, 1,LO,6, 2,LO,ER}, // no firewall
{3,6,3, 4,6,ER, 5,ER,9, 0,LO,12, 1,LO,15, 2,LO,ER}, // SITE hostname
{3,6,3, 4,6,ER, 6,LO,9, 1,LO,12, 2,LO,ER}, // USER after logon
{7,3,3, 0,LO,6, 1,LO,9, 2,LO,ER}, //proxy OPEN
{3,6,3, 4,6,ER, 0,LO,9, 1,LO,12, 2,LO,ER}, // Transparent
{6,LO,3, 1,LO,6, 2,LO,ER}, // USER with no logon
{8,6,3, 4,6,ER, 0,LO,9, 1,LO,12, 2,LO,ER}, //USER fireID@remotehost
{9,ER,3, 1,LO,6, 2,LO,ER}, //USER remoteID@remotehost fireID
{10,LO,3, 11,LO,6, 2,LO,ER} // USER remoteID@fireID@remotehost
};
在网上和书上看到很多这段程序,说是针对不同防火墙的登陆序列,我查了很多书,不太明白数组里的数字是怎么得到的.在程序运行的时候是怎么运作的?
还望高人指点
谢谢


PS:其中有一本书是<<Visual C++网络通信协议分析与应用实现>> 人民邮电出版社

[insulator]

怎么没人帮一下
急啊

[llmsn]

帮你顶一下先,1楼

[Caps77]

不一定要理会它，USER+PASSWORD能登陆就OK了

[insulator]

总得弄明白啊

[danscort2000]

那是RFC里的一个关于安全的扩展,
文档里写了一大堆,
没兴趣看,因为在现实中几乎都不使用.