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Annotation of embedaddon/rsync/lib/getpass.c, revision 1.1.1.1

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: }