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134 lines
3 KiB
C
134 lines
3 KiB
C
/*
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* libcsync -- a library to sync a directory with another
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*
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* Copyright (c) 2008 by Andreas Schneider <mail@cynapses.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* vim: ts=2 sw=2 et cindent
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include "csync_auth.h"
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/** Zero a structure */
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#define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
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int csync_auth(const char *prompt, char *buf, size_t len, int echo, 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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char *ptr = NULL;
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char tmp[len];
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ZERO_STRUCT(attr);
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ZERO_STRUCT(old_attr);
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ZERO_STRUCT(tmp);
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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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/* read the password */
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while (!ok) {
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if (*buf) {
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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));
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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[len];
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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, sizeof(key_string), stdin)) {
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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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fflush(stdout);
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continue;
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}
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}
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ok = 1;
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}
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/* reset terminal */
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if (tcsetattr(STDIN_FILENO, TCSANOW, &old_attr)) {
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ok = 0;
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}
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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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/* force termination */
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buf[len - 1] = '\0';
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ZERO_STRUCT(tmp);
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/* return nonzero if not okay */
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return !ok;
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}
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