76 lines
1.5 KiB
C
Executable file
76 lines
1.5 KiB
C
Executable file
/* getpass() - read a password Author: Kees J. Bot
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* Feb 16 1993
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*/
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#define open _open
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#define sigaction _sigaction
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#define sigemptyset _sigemptyset
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#define tcgetattr _tcgetattr
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#define tcsetattr _tcsetattr
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#define write _write
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#define read _read
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#define close _close
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <signal.h>
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#include <termios.h>
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#include <string.h>
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static int intr;
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static void catch(int sig)
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{
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intr= 1;
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}
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char *getpass(const char *prompt)
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{
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struct sigaction osa, sa;
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struct termios cooked, raw;
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static char password[32+1];
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int fd, n= 0;
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/* Try to open the controlling terminal. */
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if ((fd= open("/dev/tty", O_RDONLY)) < 0) return NULL;
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/* Trap interrupts unless ignored. */
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intr= 0;
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sigaction(SIGINT, NULL, &osa);
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if (osa.sa_handler != SIG_IGN) {
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sigemptyset(&sa.sa_mask);
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sa.sa_flags= 0;
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sa.sa_handler= catch;
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sigaction(SIGINT, &sa, &osa);
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}
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/* Set the terminal to non-echo mode. */
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tcgetattr(fd, &cooked);
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raw= cooked;
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raw.c_iflag|= ICRNL;
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raw.c_lflag&= ~ECHO;
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raw.c_lflag|= ECHONL;
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raw.c_oflag|= OPOST | ONLCR;
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tcsetattr(fd, TCSANOW, &raw);
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/* Print the prompt. (After setting non-echo!) */
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write(2, prompt, strlen(prompt));
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/* Read the password, 32 characters max. */
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while (read(fd, password+n, 1) > 0) {
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if (password[n] == '\n') break;
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if (n < 32) n++;
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}
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password[n]= 0;
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/* Terminal back to cooked mode. */
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tcsetattr(fd, TCSANOW, &cooked);
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close(fd);
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/* Interrupt? */
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sigaction(SIGINT, &osa, NULL);
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if (intr) raise(SIGINT);
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return password;
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}
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