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Diffstat (limited to 'getpass.c')
| -rw-r--r-- | getpass.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/getpass.c b/getpass.c new file mode 100644 index 00000000..c5fe4829 --- /dev/null +++ b/getpass.c @@ -0,0 +1,223 @@ +/* Copyright 1993-95 by Carl Harris, Jr. + * All rights reserved + * + * Distribute freely, except: don't remove my name from the source or + * documentation (don't take credit for my work), mark your changes (don't + * get me blamed for your possible bugs), don't alter or remove this + * notice. May be sold if buildable source is provided to buyer. No + * warrantee of any kind, express or implied, is included with this + * software; use at your own risk, responsibility for damages (if any) to + * anyone resulting from the use of this software rests entirely with the + * user. + * + * Send bug reports, bug fixes, enhancements, requests, flames, etc., and + * I'll try to keep a version up to date. I can be reached as follows: + * Carl Harris <ceharris@mal.com> + */ + + +/*********************************************************************** + module: getpass.c + project: popclient + programmer: Carl Harris, ceharris@mal.com + description: getpass() replacement which allows for long passwords. + + $Log: getpass.c,v $ + Revision 1.1 1996/06/28 14:33:54 esr + Initial revision + + Revision 1.4 1995/08/10 00:32:27 ceharris + Preparation for 3.0b3 beta release: + - added code for --kill/--keep, --limit, --protocol, --flush + options; --pop2 and --pop3 options now obsoleted by --protocol. + - added support for APOP authentication, including --with-APOP + argument for configure. + - provisional and broken support for RPOP + - added buffering to SockGets and SockRead functions. + - fixed problem of command-line options not being correctly + carried into the merged options record. + + Revision 1.3 1995/08/08 01:01:19 ceharris + Added GNU-style long options processing. + Fixed password in 'ps' output problem. + Fixed various RCS tag blunders. + Integrated .poprc parser, lexer, etc into Makefile processing. + + ***********************************************************************/ + +#include <config.h> + +#if defined(STDC_HEADERS) +#include <stdio.h> +#endif + +#include <signal.h> + +#define INPUT_BUF_SIZE MAX_PASSWORD_LENGTH + +#if defined(HAVE_TERMIOS_H) && defined(HAVE_TCSETATTR) +# include <termios.h> +#else +#if defined(HAVE_TERMIO_H) +# include <sys/ioctl.h> +# include <termio.h> +#else +#if defined(HAVE_SGTTY_H) +# include <sgtty.h> +#endif +#endif +#endif + +static int ttyfd; + +#if defined(HAVE_TCSETATTR) + static struct termios termb; + static tcflag_t flags; +#else +#if defined(HAVE_TERMIO_H) + static struct termio termb; + static unsigned short flags; +#else +#if defined(HAVE_STTY) + static struct sgttyb ttyb; + static int flags; +#endif +#endif +#endif + +void save_tty_state(); +void disable_tty_echo(); +void restore_tty_state(); + +char * +getpassword(prompt) +char *prompt; +{ + +#if !(defined(HAVE_TCSETATTR) || defined(HAVE_TERMIO_H) || defined(HAVE_STTY)) + +#if defined(HAVE_GETPASS) + char *getpass(); + return getpass(prompt); +#else + fputs("ERROR: no support for getpassword() routine\n",stderr); + exit(1); +#endif + +#endif /* !(defined(HAVE_TCSETATTR) || ... */ + + register char *p; + register c; + FILE *fi; + static char pbuf[INPUT_BUF_SIZE]; + RETSIGTYPE (*sig)(); + RETSIGTYPE sigint_handler(); + + + /* get the file descriptor for the input device */ + if ((fi = fdopen(open("/dev/tty", 2), "r")) == NULL) + fi = stdin; + else + setbuf(fi, (char *)NULL); + + /* store descriptor for the tty */ + ttyfd = fileno(fi); + + /* preserve tty state before turning off echo */ + save_tty_state(); + + /* now that we have the current tty state, we can catch SIGINT and + exit gracefully */ + sig = signal(SIGINT, sigint_handler); + + /* turn off echo on the tty */ + disable_tty_echo(); + + /* display the prompt and get the input string */ + fprintf(stderr, "%s", prompt); fflush(stderr); + for (p=pbuf; (c = getc(fi))!='\n' && c!=EOF;) { + if (p < &pbuf[INPUT_BUF_SIZE - 1]) + *p++ = c; + } + *p = '\0'; + + /* write a newline so cursor won't appear to hang */ + fprintf(stderr, "\n"); fflush(stderr); + + /* restore previous state of the tty */ + restore_tty_state(); + + /* restore previous state of SIGINT */ + signal(SIGINT, sig); + + if (fi != stdin) + fclose(fi); + + return(pbuf); + +} + + +void +save_tty_state () +{ +#if defined(HAVE_TCSETATTR) + tcgetattr(ttyfd, &termb); + flags = termb.c_lflag; +#else +#if defined(HAVE_TERMIO_H) + ioctl(ttyfd, TCGETA, (char *) &termb); + flags = termb.c_lflag; +#else /* we HAVE_STTY */ + gtty(ttyfd, &ttyb); + flags = ttyb.sg_flags; +#endif +#endif +} + + +void +disable_tty_echo() +{ + /* turn off echo on the tty */ +#if defined(HAVE_TCSETATTR) + termb.c_lflag &= ~ECHO; + tcsetattr(ttyfd, TCSAFLUSH, &termb); +#else +#if defined(HAVE_TERMIO_H) + termb.c_lflag &= ~ECHO; + ioctl(ttyfd, TCSETA, (char *) &termb); +#else /* we HAVE_STTY */ + ttyb.sg_flags &= ~ECHO; + stty(ttyfd, &ttyb); +#endif +#endif +} + + + +void +restore_tty_state() +{ + /* restore previous tty echo state */ +#if defined(HAVE_TCSETATTR) + termb.c_lflag = flags; + tcsetattr(ttyfd, TCSAFLUSH, &termb); +#else +#if defined(HAVE_TERMIO_H) + termb.c_lflag = flags; + ioctl(ttyfd, TCSETA, (char *) &termb); +#else /* we HAVE_STTY */ + ttyb.sg_flags = flags; + stty(ttyfd, &ttyb); +#endif +#endif +} + + +RETSIGTYPE sigint_handler () +{ + restore_tty_state(); + fputs("\nCaught signal... bailing out.\n", stderr); + exit(1); +} |