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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="289.htm">上一层</a>][<a href="301.htm">下一篇</a>]
<hr><p align="left"><small>发信人: lisuke (smart), 信区: Security <br>

标  题: 一个简单的telnetd防护程序（3） <br>

发信站: BBS 水木清华站 (Wed Oct 25 00:29:24 2000) <br>

  <br>

记录模块：log.c <br>

#include        <stdio.h> <br>

#include        <stdarg.h> <br>

#include        <time.h> <br>

char    logFileName[32]; <br>

FILE    *fp; <br>

void InitLog(char * sFileName) <br>

{ <br>

        sprintf(logFileName, sFileName); <br>

        if ((fp  = fopen(logFileName,"a")) == NULL)     { <br>

                fprintf(stderr,"open log file error\n"); <br>

                exit(-1); <br>

        } <br>

} <br>

void EndLog( void ) <br>

{ <br>

        fclose(fp); <br>

} <br>

void PrLog(char *fmt,...) <br>



{        time_t  T; <br>

        char    logtime[32]; <br>

        char    buf[512]; <br>

        va_list va; <br>

        va_start(va, fmt); <br>

        vsprintf(buf, fmt, va); <br>

        va_end(va);; <br>

        time(&T); <br>

        ctime_r(&T, logtime, 32); <br>

        logtime[24] = '\0';     /* eliminate char '\n' */ <br>

        fprintf(fp,"[%s] %s\n", logtime, buf); <br>

        fflush(fp); <br>

} <br>

Makefile <br>

start:  in.telnetd.firewall <br>

in.telnetd.firewall: in.telnetd.firewall.c ipauth.c log.c <br>

        cc -o in.telnetd.firewall in.telnetd.firewall.c ipauth.c log.c -lsocket <br>

-lnsl <br>

make ok ! <br>

然后kill掉inetd进程，重起inetd <br>

实验，由非授权IP登陆偶们的机器结果如下： <br>

#telnet our.dear.hacked.host <br>



Trying our.dear.hacked.host... <br>

Connected to our.dear.hacked.host. <br>

Escape character is '^]'. <br>

Not on console, u have been loged, xixi...;) <br>

Connection closed by foreign host. <br>

# <br>

/etc/telnet.log成功记录了我们实验用的IP，利用这个简单程序 <br>

我们可以记录到不受欢迎的访问者的IP地址。呵呵 <br>

$ cat /etc/telnet.log <br>

[Fri Jul 22 23:49:36 1998] XXX.XXX.XXX.XXX <br>

[Fri Jul 23 00:31:42 1998] YYY.YYY.YYY.YYY <br>

$ <br>

-- <br>

</small><hr>
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