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Annotation of embedaddon/rsync/lib/getpass.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * An implementation of getpass for systems that lack one.
        !             3:  *
        !             4:  * Copyright (C) 2013 Roman Donchenko
        !             5:  *
        !             6:  * This program is free software; you can redistribute it and/or modify
        !             7:  * it under the terms of the GNU General Public License as published by
        !             8:  * the Free Software Foundation; either version 3 of the License, or
        !             9:  * (at your option) any later version.
        !            10:  *
        !            11:  * This program is distributed in the hope that it will be useful,
        !            12:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14:  * GNU General Public License for more details.
        !            15:  *
        !            16:  * You should have received a copy of the GNU General Public License along
        !            17:  * with this program; if not, visit the http://fsf.org website.
        !            18:  */
        !            19: 
        !            20: #include <stdio.h>
        !            21: #include <string.h>
        !            22: #include <termios.h>
        !            23: 
        !            24: #include "rsync.h"
        !            25: 
        !            26: char *getpass(const char *prompt)
        !            27: {
        !            28:        static char password[256];
        !            29: 
        !            30:        BOOL tty_changed = False, read_success;
        !            31:        struct termios tty_old, tty_new;
        !            32:        FILE *in = stdin, *out = stderr;
        !            33:        FILE *tty = fopen("/dev/tty", "w+");
        !            34: 
        !            35:        if (tty)
        !            36:                in = out = tty;
        !            37: 
        !            38:        if (tcgetattr(fileno(in), &tty_old) == 0) {
        !            39:                tty_new = tty_old;
        !            40:                tty_new.c_lflag &= ~(ECHO | ISIG);
        !            41: 
        !            42:                if (tcsetattr(fileno(in), TCSAFLUSH, &tty_new) == 0)
        !            43:                        tty_changed = True;
        !            44:        }
        !            45: 
        !            46:        if (!tty_changed)
        !            47:                fputs("(WARNING: will be visible) ", out);
        !            48:        fputs(prompt, out);
        !            49:        fflush(out);
        !            50: 
        !            51:        read_success = fgets(password, sizeof password, in) != NULL;
        !            52: 
        !            53:        /* Print the newline that hasn't been echoed. */
        !            54:        fputc('\n', out);
        !            55: 
        !            56:        if (tty_changed)
        !            57:                tcsetattr(fileno(in), TCSAFLUSH, &tty_old);
        !            58: 
        !            59:        if (tty)
        !            60:                fclose(tty);
        !            61: 
        !            62:        if (read_success) {
        !            63:                /* Remove the trailing newline. */
        !            64:                size_t password_len = strlen(password);
        !            65:                if (password_len && password[password_len - 1] == '\n')
        !            66:                        password[password_len - 1] = '\0';
        !            67: 
        !            68:                return password;
        !            69:        }
        !            70: 
        !            71:        return NULL;
        !            72: }