misc: Added multiplatform ssh_getpass() fuction.
Этот коммит содержится в:
Andreas Schneider
родитель
8abdaa7abf
Коммит
50a119dd0a
@ -468,6 +468,9 @@ LIBSSH_API ssh_string ssh_string_new(size_t size);
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LIBSSH_API char *ssh_string_to_char(ssh_string str);
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LIBSSH_API void ssh_string_free_char(char *s);
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LIBSSH_API int ssh_getpass(const char *prompt, char *buf, size_t len, int echo,
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int verify);
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#ifndef LIBSSH_LEGACY_0_4
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#include "libssh/legacy.h"
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#endif
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@ -86,6 +86,7 @@ set(libssh_SRCS
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crypt.c
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dh.c
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error.c
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getpass.c
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gcrypt_missing.c
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gzip.c
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init.c
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265
src/getpass.c
Обычный файл
265
src/getpass.c
Обычный файл
@ -0,0 +1,265 @@
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/*
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* getpass.c - platform independent getpass function.
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*
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* This file is part of the SSH Library
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*
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* Copyright (c) 2011 by Andreas Schneider <mail@cryptomilk.org>
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*
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* The SSH Library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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*
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* The SSH Library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with the SSH Library; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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* MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <libssh/priv.h>
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/**
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* @internal
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*
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* @brief Get the password from the console.
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*
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* @param[in] prompt The prompt to display.
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*
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* @param[in] buf The buffer to fill.
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*
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* @param[in] len The length of the buffer.
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*
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* @param[in] verify Should the password be verified?
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*
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* @return 1 on success, 0 on error.
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*/
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static int ssh_gets(const char *prompt, char *buf, size_t len, int verify) {
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char *tmp;
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char *ptr = NULL;
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int ok = 0;
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tmp = malloc(len);
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if (tmp == NULL) {
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return 0;
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}
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ZERO_STRUCT(tmp);
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/* read the password */
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while (!ok) {
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if (buf[0] != '\0') {
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fprintf(stdout, "%s[%s] ", prompt, buf);
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} else {
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fprintf(stdout, "%s", prompt);
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}
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fflush(stdout);
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while (fgets(tmp, len, stdin) != NULL);
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if ((ptr = strchr(tmp, '\n'))) {
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*ptr = '\0';
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}
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fprintf(stdout, "\n");
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if (*tmp) {
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strncpy(buf, tmp, len);
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}
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if (verify) {
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char *key_string;
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key_string = (char *) malloc(len);
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if (key_string == NULL) {
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break;
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}
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ZERO_STRUCT(key_string);
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fprintf(stdout, "\nVerifying, please re-enter. %s", prompt);
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fflush(stdout);
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if (! fgets(key_string, len, stdin)) {
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ZERO_STRUCT(key_string);
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SAFE_FREE(key_string);
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clearerr(stdin);
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continue;
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}
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if ((ptr = strchr(key_string, '\n'))) {
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*ptr = '\0';
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}
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fprintf(stdout, "\n");
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if (strcmp(buf, key_string)) {
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printf("\n\07\07Mismatch - try again\n");
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ZERO_STRUCT(key_string);
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SAFE_FREE(key_string);
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fflush(stdout);
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continue;
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}
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ZERO_STRUCT(key_string);
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SAFE_FREE(key_string);
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}
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ok = 1;
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}
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ZERO_STRUCT(tmp);
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free(tmp);
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return ok;
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}
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#ifdef _WIN32
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#include <windows.h>
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int ssh_getpass(const char *prompt,
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char *buf,
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size_t len,
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int echo,
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int verify) {
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HANDLE h;
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DWORD mode = 0;
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int ok;
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/* get stdin and mode */
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h = GetStdHandle(STD_INPUT_HANDLE);
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if (!GetConsoleMode(h, &mode)) {
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return -1;
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}
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/* disable echo */
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if (!echo) {
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if (!SetConsoleMode(h, mode & ~ENABLE_ECHO_INPUT)) {
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return -1;
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}
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}
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ok = ssh_gets(prompt, buf, len, verify);
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/* reset echo */
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SetConsoleMode(h, mode);
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if (!ok) {
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ZERO_STRUCT(buf);
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return -1;
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}
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/* force termination */
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buf[len - 1] = '\0';
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return 0;
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}
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#else
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#include <fcntl.h>
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#include <termios.h>
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#include <unistd.h>
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/**
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* @ingroup libssh_misc
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*
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* @brief Get a password from the console.
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*
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* You should make sure that the buffer is an empty string!
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*
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* You can also use this function to ask for a username. Then you can fill the
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* buffer with the username and it is shows to the users. If the users just
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* presses enter the buffer will be untouched.
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*
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* @code
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* char username[128];
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*
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* snprintf(username, sizeof(username), "john");
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*
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* ssh_getpass("Username:", username, sizeof(username), 1, 0);
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* @endcode
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*
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* The prompt will look like this:
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*
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* Username: [john]
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*
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* If you press enter then john is used as the username, or you can type it in
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* to change it.
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*
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* @param[in] prompt The prompt to show to ask for the password.
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*
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* @param[out] buf The buffer the password should be stored. It NEEDS to be
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* empty or filled out.
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*
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* @param[in] len The length of the buffer.
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*
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* @param[in] echo Should we echo what you type.
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*
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* @param[in] verify Should we ask for the password twice.
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*
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* @return 0 on success, -1 on error.
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*/
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int ssh_getpass(const char *prompt,
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char *buf,
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size_t len,
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int echo,
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int verify) {
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struct termios attr;
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struct termios old_attr;
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int ok = 0;
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int fd = -1;
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ZERO_STRUCT(attr);
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ZERO_STRUCT(old_attr);
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/* get local terminal attributes */
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if (tcgetattr(STDIN_FILENO, &attr) < 0) {
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perror("tcgetattr");
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return -1;
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}
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/* save terminal attributes */
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memcpy(&old_attr, &attr, sizeof(attr));
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if((fd = fcntl(0, F_GETFL, 0)) < 0) {
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perror("fcntl");
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return -1;
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}
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/* disable echo */
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if (!echo) {
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attr.c_lflag &= ~(ECHO);
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}
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/* write attributes to terminal */
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &attr) < 0) {
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perror("tcsetattr");
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return -1;
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}
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/* disable nonblocking I/O */
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if (fd & O_NDELAY) {
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fcntl(0, F_SETFL, fd & ~O_NDELAY);
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}
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ok = ssh_gets(prompt, buf, len, verify);
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/* reset terminal */
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tcsetattr(STDIN_FILENO, TCSANOW, &old_attr);
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/* close fd */
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if (fd & O_NDELAY) {
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fcntl(0, F_SETFL, fd);
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}
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if (!ok) {
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ZERO_STRUCT(buf);
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return -1;
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}
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/* force termination */
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buf[len - 1] = '\0';
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return 0;
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}
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#endif
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/* vim: set ts=4 sw=4 et cindent syntax=c.doxygen: */
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