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port-crk.c
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port-crk.c
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/* Scanner porta com socket
* link: http://chmodsecurity.com.br/artigo/10/escrevendo-um-scanner-port-em-c-0xc3
* tutorial
* instrodução a socket em C
***************************************************
/*
#include <stdio.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define STARTPORT 1 /* começo da porta a se escaneada */
#define ENDPORT 1024 /* final da porta do renge*/
#define OPEN 1 /* define open 1 */
#define CLOSED 2 /* define fechado com 2 */
#define ERROR -1 // -1 em caso de erro
int checkprt(int port, char *ip)
{
int test = 0;
int sockfd;
struct sockaddr_in servaddr;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd < 0) {
printf("error socket não foi criado\n");
return ERROR;
}
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = inet_addr(ip);
servaddr.sin_port = htons(port);
test = connect(sockfd, (struct sockaddr_in *)&servaddr, sizeof(servaddr));
if(test == -1){
close(sockfd);
return CLOSED;
}
close(sockfd);
return OPEN;
}
int main(int argc, char **argv)
{
int i;
char *dest;
if(argc != 2) {
printf("[*] %s IP-alvo\n",argv[0]);
return ERROR;
}
dest = argv[1];
printf("\t-----------------------------------\n");
printf("start scan :D %d até %d -> %s\n\n",STARTPORT, ENDPORT, argv[1]);
for(i = STARTPORT; i <= ENDPORT; i++)
if(checkprt(i,dest) == OPEN)
printf("port %d está aberta brown\n",i);
printf("scan terminado\n");
return 0;
}