#include <u.h>#include <libc.h>#include <authsrv.h>#include <auth.h>#include <bio.h>#include "authcmdlib.h" char	flagd;char	flag6;		/* force base64 output */char	flagn; inttrim(char *s, int n){	if(s[0] == '+' && s[1] == ' ')		memmove(s, s + 2, n -= 2);	else if(!strncmp(s, "334 ", 4))		memmove(s, s + 4, n -= 4);	if(n > 0 && s[n - 1] == '\r')		s[--n] = 0;	if(n > 0 && s[n - 1] == '\n')		s[--n] = 0;	return n;} intdecode(char *s, int n, int *base64){	char ch[128]; 	n = trim(s, n);	if(strchr(s, '<') != 0)		return n;	*base64 = 1;	n = dec64((uchar*)ch, sizeof ch, s, n);	if(n == -1)		sysfatal("dec64: buffer too small");	memcpy(s, ch, n);	s[n] = 0;	return n;} voidusage(void){	fprint(2, "usage: cram [-d6] [-u user] [-s server]\n");	exits("usage");} voidmain(int argc, char *argv[]){	char buf[128], usr[64], rbuf[128], ubuf[128], ebuf[192], arbuf[128];	char *user, *server, *p, *e;	int n, l, i, base64; 	quotefmtinstall();	fmtinstall('[', encodefmt);	user = getuser();	server = "cramtemp"; 	ARGBEGIN{	case 'd':		flagd++;		break;	case '6':		flag6++;		break;	case 's':		server = EARGF(usage());		break;	case 'u':		user = EARGF(usage());		break;	case 'n':		flagn++;		break;	default:		usage();	}ARGEND	if(argc)		usage(); 	for(;;){		fprint(2, "challenge: ");		n = read(0, buf, sizeof buf - 1);		if(n <= 0)			exits(0);		buf[n] = '\0';		base64 = flag6;		n = decode(buf, n, &base64);		if(flagd && base64)			fprint(2, "raw ch [%s]\n", buf);		e = arbuf + sizeof arbuf;		p = seprint(arbuf, e, "proto=cram role=client server=%q", server);		if(!flagn)			seprint(p, e, " user=%q", user);		n = auth_respond(buf, n, usr, sizeof usr, rbuf, sizeof rbuf, auth_getkey, "%s", arbuf);		if(n == -1)			sysfatal("auth_respond: %r");		for(i = 0; i < n; i++)			if(rbuf[i] >= 'A' && rbuf[i] <= 'Z')				rbuf[i] += 'a' - 'A';		l = snprint(ubuf, sizeof ubuf, "%s %.*s", usr, n, rbuf);		snprint(ebuf, sizeof ebuf, "%.*[", l, ubuf);		if(flagd && base64)			fprint(2, "raw cram [%s]\n", ubuf);		if(base64)			print("%s\n", ebuf);		else			print("%s\n", ubuf);	}}