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lscan.c --> listen scanner
by f1ex
usage: lscan <inputfile> <port number> [outputfile]
props to: duke well this 99% of his c0de...I just did a ripped =)
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
void usage(char *);
void printheader(void);
void testhost(char *);
FILE *of;
int main(int argc, char *argv[])
{
FILE *fp;
char host[1024];
int c;
c = 0;
printf("\npscan: port scanner for linux by f1ex\n");
printf("-------------------------------------\n\n");
if(argc < 2){
usage(argv[0]);
return 0;
}
if(argc == 3){
of = fopen(argv[2], "w");
printheader();
} else {
of = stdout; /* when using fprintf i can refer to stdout or log
file without having to do conditions */
}
if((fp = fopen(argv[1], "r")) == NULL){
printf("error: input file does not exist\n");
return 0;
}
printf("scanning...");
while(fscanf(fp, "%s", &host) != EOF){
testhost(host);
}
printf("end of scan\n");
return 0;
}
void usage(char *progname)
{
printf("usage: %s <inputfile> [outputfile]\n", progname);
printf("\n\ninputfile: a list of hosts (or ip's) to scan\n");
printf("outputfile: optionally record results to a file instead of stdout\n\n\n");
}
void printheader(void)
{
fprintf(of, "port scan results file\n");
fprintf(of, "----------------------\n\n");
}
void testhost(char *target)
{
struct sockaddr_in server;
int sockfd, i;
char version[256];
struct hostent *hp;
printf("%s\n", target);
if((hp=(struct hostent *)gethostbyname(target)) == NULL) {
fprintf(of, "%s: unknown host\n", target);
return;
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
bzero(&server, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(31337);
memcpy((char *)&server.sin_addr, (char *)hp->h_addr, hp->h_length);
if((connect(sockfd, (struct sockaddr *)&server, sizeof(server))) == -1){
fprintf(of, "%s: connect error\n", target);
return;
}
else
{
fprintf(of, "%s: open", target);
}
close(sockfd);
return;
}
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