1*35669Sbostic /* 2*35669Sbostic * Copyright (c) 1988 The Regents of the University of California. 3*35669Sbostic * All rights reserved. 4*35669Sbostic * 5*35669Sbostic * Redistribution and use in source and binary forms are permitted 6*35669Sbostic * provided that the above copyright notice and this paragraph are 7*35669Sbostic * duplicated in all such forms and that any documentation, 8*35669Sbostic * advertising materials, and other materials related to such 9*35669Sbostic * distribution and use acknowledge that the software was developed 10*35669Sbostic * by the University of California, Berkeley. The name of the 11*35669Sbostic * University may not be used to endorse or promote products derived 12*35669Sbostic * from this software without specific prior written permission. 13*35669Sbostic * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14*35669Sbostic * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15*35669Sbostic * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16*35669Sbostic */ 17*35669Sbostic 1826559Sdonn #if defined(LIBC_SCCS) && !defined(lint) 19*35669Sbostic static char sccsid[] = "@(#)getpass.c 5.3 (Berkeley) 09/22/88"; 20*35669Sbostic #endif /* LIBC_SCCS and not lint */ 2122094Smckusick 22*35669Sbostic #include <sys/ioctl.h> 23*35669Sbostic #include <sys/signal.h> 242017Swnj #include <stdio.h> 252017Swnj 262017Swnj char * 272017Swnj getpass(prompt) 28*35669Sbostic char *prompt; 292017Swnj { 302017Swnj struct sgttyb ttyb; 31*35669Sbostic register int ch; 322017Swnj register char *p; 33*35669Sbostic FILE *fp, *outfp; 34*35669Sbostic long omask; 35*35669Sbostic int svflagval; 36*35669Sbostic #define PASSWD_LEN 8 37*35669Sbostic static char buf[PASSWD_LEN + 1]; 382017Swnj 39*35669Sbostic /* 40*35669Sbostic * read and write to /dev/tty if possible; else read from 41*35669Sbostic * stdin and write to stderr. 42*35669Sbostic */ 43*35669Sbostic if ((outfp = fp = fopen("/dev/tty", "w+")) == NULL) { 44*35669Sbostic outfp = stderr; 45*35669Sbostic fp = stdin; 46*35669Sbostic } 47*35669Sbostic 48*35669Sbostic (void)ioctl(fileno(fp), TIOCGETP, &ttyb); 49*35669Sbostic svflagval = ttyb.sg_flags; 502017Swnj ttyb.sg_flags &= ~ECHO; 51*35669Sbostic omask = sigblock(sigmask(SIGINT)); 52*35669Sbostic (void)ioctl(fileno(fp), TIOCSETP, &ttyb); 53*35669Sbostic 54*35669Sbostic fputs(prompt, outfp); 55*35669Sbostic rewind(outfp); /* implied flush */ 56*35669Sbostic for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';) 57*35669Sbostic if (p < buf + PASSWD_LEN) 58*35669Sbostic *p++ = ch; 592017Swnj *p = '\0'; 60*35669Sbostic (void)write(fileno(outfp), "\n", 1); 61*35669Sbostic 62*35669Sbostic ttyb.sg_flags = svflagval; 63*35669Sbostic (void)ioctl(fileno(fp), TIOCSETP, &ttyb); 64*35669Sbostic (void)sigsetmask(omask); 65*35669Sbostic if (fp != stdin) 66*35669Sbostic (void)fclose(fp); 67*35669Sbostic return(buf); 682017Swnj } 69