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发信人: lgwu (乱世糊涂虫), 信区: Security
标 题: a simple port scan
发信站: 武汉白云黄鹤站 (Fri Jan 29 21:00:02 1999) , 站内信件
static char sccsid[] = "@(#)pscan.c 1.0 (KRAD) 08/25/94";
#include
#include
#include
#include
#include
#define MAX_PORT 1024 /* scan up to this port */
int s;
struct sockaddr_in addr;
char rmt_host[100];
int skan(port)
int port;
{
int r;
s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (s < 0) {
/* fprintf("ERROR: socket() failed\n"); */
/* Changed to printf for my Linux 1.1.18 box */
printf("ERROR: socket() failed\n");
exit(0);
}
addr.sin_family = PF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = inet_addr(rmt_host);
r = connect(s,(struct sockaddr *) &addr, sizeof(addr));
close(s);
if (r==-1) {
return (1 == 0);
}
return (1 == 1);
}
main(argc,argv)
int argc;
char *argv[];
{
int a,b,c,d,e,f;
struct hostent *foo;
struct servent *bar;
if (argc < 2) {
fprintf(stderr,"usage: %s [highest port]\n",arg
v[0]);
exit(0);
}
if (sscanf(argv[1],"%d.%d.%d.%d",&a,&b,&c,&d) != 4) {
foo = gethostbyname(argv[1]);
if (foo == NULL) {
fprintf(stderr,"error: cannot resolve host %s\n",ar
gv[1]);
exit(0);
}
sprintf(rmt_host,"%d.%d.%d.%d",(unsigned char )foo->h_
addr_list[0][0],
(unsigned char ) foo->h_addr_list[0][1],
(unsigned char ) foo->h_addr_list[0][2],
(unsigned char ) foo->h_addr_list[0][3]);
} else {
strncpy(rmt_host,argv[1],99);
}
if (argc > 2) {
f = atoi(argv[2]);
} else
f = MAX_PORT;
fprintf(stdout,"Scanning host %s - TCP ports 1 through %d
\n",rmt_host,f);
for (e =1;e char serv[100];
if (skan(e)) {
bar = getservbyport(htons(e),"tcp");
printf("%d (%s) is running.\n",e,(bar == NULL) ? "U
NKNOWN" :
bar->s_name);
}
}
}
/* This simple port scan program can be found in /var/log/messages */
But if u use nmap( half connect,NULL connect,a normal TCPwarp couldn't
find it out. As a patch,you can use tcplog.I posted it before.
--
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