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#include "stdio.h" | |
#include "sys/socket.h" | |
#include "errno.h" | |
#include "netdb.h" | |
#include "string.h" | |
#include "stdlib.h" | |
int main(int argc , char **argv) | |
{ | |
struct hostent *host; | |
int err, i , sock ,start , end; | |
char hostname[100]; | |
struct sockaddr_in sa; | |
//Get the hostname to scan | |
printf("Enter hostname or IP : "); | |
gets(hostname); | |
//Get start port number | |
printf("\nEnter start port number : "); | |
scanf("%d" , &start); | |
//Get end port number | |
printf("Enter end port number : "); | |
scanf("%d" , &end); | |
//Initialise the sockaddr_in structure | |
strncpy((char*)&sa , "" , sizeof sa); | |
sa.sin_family = AF_INET; | |
//direct ip address, use it | |
if(isdigit(hostname[0])) | |
{ | |
printf("Doing inet_addr..."); | |
sa.sin_addr.s_addr = inet_addr(hostname); | |
printf("Done\n"); | |
} | |
//Resolve hostname to ip address | |
else if( (host = gethostbyname(hostname)) != 0) | |
{ | |
printf("Doing gethostbyname..."); | |
strncpy((char*)&sa.sin_addr , (char*)host->h_addr , sizeof sa.sin_addr); | |
printf("Done\n"); | |
} | |
else | |
{ | |
herror(hostname); | |
exit(2); | |
} | |
//Start the port scan loop | |
printf("Starting the portscan loop : \n"); | |
for( i = start ; i <= end ; i++) | |
{ | |
//Fill in the port number | |
sa.sin_port = htons(i); | |
//Create a socket of type internet | |
sock = socket(AF_INET , SOCK_STREAM , 0); | |
//Check whether socket created fine or not | |
if(sock < 0) | |
{ | |
perror("\nSocket"); | |
exit(1); | |
} | |
//Connect using that socket and sockaddr structure | |
err = connect(sock , (struct sockaddr*)&sa , sizeof sa); | |
//not connected | |
if( err < 0 ) | |
{ | |
//printf("%s %-5d %s\r" , hostname , i, strerror(errno)); | |
fflush(stdout); | |
} | |
//connected | |
else | |
{ | |
printf("%-5d open\n", i); | |
} | |
close(sock); | |
} | |
printf("\r"); | |
fflush(stdout); | |
return(0); | |
} |
is < and html encode error?
counldn't find where is it's definiation
Hi, when I try to compilate this code the compiler throw me an error. It's says:
use of undeclared identifier 'amp
Could you explain what is amp please??
Hi, when I try to compilate this code the compiler throw me an error. It's says:
use of undeclared identifier 'amp
Could you explain what is amp please??
i found the same code in a other website and it dated since 2013 so i think it doesnt work
Although I don't see the "amp" you're talking about. I believe this code is an attempt to correct the HTML encoding as seen here. https://www.binarytides.com/tcp-connect-port-scanner-c-code-linux-sockets/comment-page-1/?unapproved=243282&moderation-hash=b537728250f6e31ca1745b6518b20629#comment-243282
just delete "amp" and leave the "&" which is called an "amp"ersand.
Nice Bro
does it work??