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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#define	NETCHLEN	16		/* max network challenge length	*/
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char *	argv0;
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int	debug;
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int	delete;
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char *	root = "/n/emelie";
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char *	user;
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char	file[64];
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char	challenge[NETCHLEN];
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char	response[NETCHLEN];
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void
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usage(void)
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{
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	printf("usage: %s [-d] username\n", argv0);
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	exit(1);
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}
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void
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main(int argc, char **argv)
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{
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	int fd, n;
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	for(argv0=*argv++,--argc; argc>0; ++argv,--argc){
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		if(argv[0][0] != '-' || argv[0][1] == '-')
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			break;
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		switch(argv[0][1]){
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		case 'D':
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			++debug;
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			break;
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		case 'd':
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			++delete;
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			break;
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		case 'r':
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			root = argv[0][2] ? &argv[0][2] : (--argc, *++argv);
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			break;
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		default:
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			usage();
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			break;
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		}
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	}
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	if(argc != 1)
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		usage();
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	user = argv[0];
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	snprintf(file, sizeof file, "%s/#%s", root, user);
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	if(debug)
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		printf("debug=%d, file=%s\n", debug, file);
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	if(delete){
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		fd = creat(file, 0600);
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		if(fd < 0){
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			perror(file);
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			exit(1);
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		}
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		exit(0);
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	}
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	fd = open(file, 2);
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	if(fd < 0){
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		perror(file);
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		exit(1);
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	}
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	n = read(fd, challenge, NETCHLEN);
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	if(debug)
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		printf("read %d\n", n);
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	if(n <= 0){
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		printf("read %d: ", n);
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		perror("");
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		exit(1);
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	}
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	printf("challenge: %s\n", challenge);
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	write(1, "response: ", 10);
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	read(0, response, NETCHLEN-1);
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	lseek(fd, 0, 0);
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	n = write(fd, response, NETCHLEN);
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	if(debug)
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		printf("write %d\n", n);
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	if(n <= 0){
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		printf("write %d: ", n);
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		perror("");
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		exit(1);
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	}
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	exit(0);
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}