セキュリティ・キャンプ2016 選択課題4

result

PASS
PASS
PASS
PASS
PASS
PASS
PASS
PASS
PASS
REJECTED
PASS
PASS
PASS
REJECTED
REJECTED
PASS
PASS
PASS
REJECTED
REJECTED
REJECTED
PASS
PASS
PASS
REJECTED
REJECTED
REJECTED
REJECTED
PASS
PASS
PASS
REJECTED
REJECTED
REJECTED
REJECTED
REJECTED
PASS
PASS
PASS
REJECTED
REJECTED
REJECTED
REJECTED
REJECTED
REJECTED

sel4.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>

#ifdef __linux
#include <sys/time.h>
#include <sys/resource.h>
#endif

char Magic[2];
char Source[20];
char Destination[20];
unsigned int DataLength;
char *Data;

int parse();
int cond1();
int cond2();
int cond3();
int cond4();
int cond5();
int cond6();
void reject();

#ifdef DEBUG
long getmem() {
	struct rusage r;
	if(getrusage(RUSAGE_SELF, &r) != 0) {
		perror("getrusage");
	}
	return r.ru_maxrss;
}
#endif

int main() {
#ifdef DEBUG
	clock_t clock_tmp;
	long mem_tmp;
#endif
	while(!parse()) {
#ifdef DEBUG
		clock_tmp = clock();
		getmem();
#endif
		if(cond1() && cond2() && cond3() && cond4() && cond5() && cond6()) {
#ifdef DEBUG
			fprintf(stderr, "matching: %d clock\n", clock() - clock_tmp);
#endif
			fprintf(stdout, "PASS\n");
		}
		else {
#ifdef DEBUG
			fprintf(stderr, "matching: %d clock\n", clock() - clock_tmp);
#endif
			fprintf(stdout, "REJECTED\n");
		}
		free(Data);
	}
#ifdef DEBUG
	fprintf(stderr, "memory: %ld", getmem());
#endif

	return 0;
}

void reject() {
	fprintf(stdout, "REJECTED\n");
}

int parse() {
	unsigned int DataLength_big;

	if(fread(Magic, 1, 2, stdin) != 2) {
		return -1;
	}
	if(fread(Source, 1, 20, stdin) != 20) {
		return -1;
	}
	if(fread(Destination, 1, 20, stdin) != 20) {
		return -1;
	}
	if(fread((char*)(&DataLength), 1, 4, stdin) != 4) {
		return -1;
	}
	DataLength_big = htonl(DataLength);
	Data = (char*)malloc(DataLength_big);
	if(Data == NULL) {
		perror("malloc");
	}
	if(fread(Data, 1, DataLength_big, stdin) != DataLength_big) {
		return -1;
	}

	return 0;
}

int cond1() {
	return Magic[0] == 'R' && Magic[1] == 'H';
}

int cond2() {
	if(strcasecmp(Source, "rise-san") * strcasecmp(Source, "cocoa-san") == 0) {
		return 1;
	}
	return 0;
}

int cond3() {
	if(strcasecmp(Destination, "Chino-chan") * strcasecmp(Destination, "Chino") == 0) {
		return 1;
	}
	return 0;
}

int cond4() {
	if(strcasecmp(Source, "cocoa-san") == 0
	  &&strcasecmp(Source, "Chino") == 0) {
		return 0;
	}
	return 1;
}

int cond5() {
	const char *valid_order_brand[20] = {
		"BlueMountain",
		"Columbia",
		"OriginalBlend"
	};
	int i;
	for(i = 0; i < 3; i++) {
		if(strstr(Data, valid_order_brand[i]) != NULL) {
			return 1;
		}
	}
	return 0;
}

int cond6() {
	const char *invalid_order_brand[20] = {
		"DandySoda",
		"FrozenEvergreen"
	};
	int i;
	for(i = 0; i < 2; i++) {
		if(strstr(Data, invalid_order_brand[i]) != NULL) {
			return 0;
		}
	}
	return 1;
}