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scrypt-1.2.1/libcperciva/util/readpass.c  view on Meta::CPAN

#include <unistd.h>

#include "insecure_memzero.h"
#include "warnp.h"

#include "readpass.h"

#define MAXPASSLEN 2048

/* Signals we need to block. */
static const int badsigs[] = {
	SIGALRM, SIGHUP, SIGINT,
	SIGPIPE, SIGQUIT, SIGTERM,
	SIGTSTP, SIGTTIN, SIGTTOU
};
#define NSIGS sizeof(badsigs)/sizeof(badsigs[0])

/* Highest signal number we care about. */
#define MAX2(a, b) ((a) > (b) ? (a) : (b))
#define MAX4(a, b, c, d) MAX2(MAX2(a, b), MAX2(c, d))
#define MAX8(a, b, c, d, e, f, g, h) MAX2(MAX4(a, b, c, d), MAX4(e, f, g, h))
#define MAXBADSIG	MAX2(SIGALRM, MAX8(SIGHUP, SIGINT, SIGPIPE, SIGQUIT, \
			    SIGTERM, SIGTSTP, SIGTTIN, SIGTTOU))

/* Has a signal of this type been received? */
static volatile sig_atomic_t gotsig[MAXBADSIG + 1];

scrypt-1.2.1/libcperciva/util/readpass.c  view on Meta::CPAN

}

/* Restore old signals and re-issue intercepted signals. */
static void
resetsigs(struct sigaction savedsa[NSIGS])
{
	size_t i;

	/* Restore old signals. */
	for (i = 0; i < NSIGS; i++)
		sigaction(badsigs[i], &savedsa[i], NULL);

	/* If we intercepted a signal, re-issue it. */
	for (i = 0; i < NSIGS; i++) {
		if (gotsig[badsigs[i]])
			raise(badsigs[i]);
	}
}

/**
 * readpass(passwd, prompt, confirmprompt, devtty)
 * If ${devtty} is non-zero, read a password from /dev/tty if possible; if
 * not, read from stdin.  If reading from a tty (either /dev/tty or stdin),
 * disable echo and prompt the user by printing ${prompt} to stderr.  If
 * ${confirmprompt} is non-NULL, read a second password (prompting if a
 * terminal is being used) and repeat until the user enters the same password

scrypt-1.2.1/libcperciva/util/readpass.c  view on Meta::CPAN

	/*
	 * If we receive a signal while we're reading the password, we might
	 * end up with echo disabled; to prevent this, we catch the signals
	 * here, and we'll re-send them to ourselves later after we re-enable
	 * terminal echo.
	 */
	sa.sa_handler = handle;
	sa.sa_flags = 0;
	sigemptyset(&sa.sa_mask);
	for (i = 0; i < NSIGS; i++)
		sigaction(badsigs[i], &sa, &savedsa[i]);

	/* If we're reading from a terminal, try to disable echo. */
	if ((usingtty = isatty(fileno(readfrom))) != 0) {
		if (tcgetattr(fileno(readfrom), &term_old)) {
			warnp("Cannot read terminal settings");
			goto err2;
		}
		memcpy(&term, &term_old, sizeof(struct termios));
		term.c_lflag = (term.c_lflag & ~((tcflag_t)ECHO)) | ECHONL;
		if (tcsetattr(fileno(readfrom), TCSANOW, &term)) {