The Port Scanner

Your Goal: Make a port scanner.

The Client: It should do the following

For every port on euclid.nmu.edu from 1 ... 99 inclusive, you should try and open that port. Tell the user if it opens or fails to open. If it does open, close it.
Also, try and read and write to the port. See if it will accept data, and see if it will send data. Only wait one second before timing out.

Sample output

No: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Yes: 21 22
No: 23 24
Yes: 25
No: 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
Yes: 80
No: 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

Grading

Points	Task
1	Every variable has a comment describing it's use
-2	Code indented wrong
2	Turned in by Friday Sep 3rd at 5:00pm
-6	Turned in after Tuesday Sep 7th at 4:00pm
-1	Every failure to error check.
1	Server prints the IP number of the server.
1	Can check one port.
1	Can check ports 1 .. 99.
3	Uses signals
1	Can read the hostname and port range from the command line.

Hints

One can find an example of signal usage here.
One can find the values on the command line like this.

One can flush cout without printing a carriage return like this
cout << "HI" << flush;

Some people have found the following code useful

int MakeSocket(char *host, int port) {
        int s;
        int len;
        struct sockaddr_in sa;
        struct hostent *hp;
        struct servent *sp;
        int portnum;
        int ret;

        hp = gethostbyname(host);
        if (hp == 0) {
                perror("HP");
                exit(1);
        }
        bcopy((char *)hp->h_addr, (char *)&sa.sin_addr, hp->h_length);
        sa.sin_family = hp->h_addrtype;
        sa.sin_port = htons(port);
        s = socket(hp->h_addrtype, SOCK_STREAM, 0);
        ret = connect(s, (struct sockaddr *)&sa, sizeof(sa));
        return ret;
}