/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <mp.h>#include <libsec.h>#include "SConn.h"#include "secstore.h" void *emalloc(ulong n){	void *p = malloc(n); 	if(p == nil)		sysfatal("emalloc");	memset(p, 0, n);	return p;} void *erealloc(void *p, ulong n){	if ((p = realloc(p, n)) == nil)		sysfatal("erealloc");	return p;} char *estrdup(char *s){	if ((s = strdup(s)) == nil)		sysfatal("estrdup");	return s;} char*getpassm(char *prompt){	char *p, line[4096];	int n, nr;	static int cons, consctl; /* closing & reopening fails in ssh environment */ 	if(cons == 0){			/* first time? */		cons = open("/dev/cons", ORDWR);		if(cons < 0)			sysfatal("couldn't open cons");		consctl = open("/dev/consctl", OWRITE);		if(consctl < 0)			sysfatal("couldn't set raw mode via consctl");	}	fprint(consctl, "rawon");	fprint(cons, "%s", prompt);	nr = 0;	p = line;	for(;;){		n = read(cons, p, 1);		if(n < 0){			fprint(consctl, "rawoff");			fprint(cons, "\n");			return nil;		}		if(n == 0 || *p == '\n' || *p == '\r' || *p == 0x7f){			*p = '\0';			fprint(consctl, "rawoff");			fprint(cons, "\n");			p = strdup(line);			memset(line, 0, nr);			return p;		}		if(*p == '\b'){			if(nr > 0){				nr--;				p--;			}		}else if(*p == ('u' & 037)){		/* cntrl-u */			fprint(cons, "\n%s", prompt);			nr = 0;			p = line;		}else{			nr++;			p++;		}		if(nr+1 == sizeof line){			fprint(cons, "line too long; try again\n%s", prompt);			nr = 0;			p = line;		}	}} static char *illegal(char *f){	syslog(0, LOG, "illegal name: %s", f);	return nil;} char *validatefile(char *f){	char *p; 	if(f == nil || *f == '\0')		return nil;	if(strcmp(f, "..") == 0 || strlen(f) >= 250)		return illegal(f);	for(p = f; *p; p++)		if(*p < 040 || *p == '/')			return illegal(f);	return f;}