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supdup.c
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/*
* User supdup program.
*
* Written Jan. 1985 by David Bridgham. Much of the code dealing
* with the network was taken from the telnet user program released
* with 4.2 BSD UNIX.
*/
/* Hacked by Bjorn Victor, November 2010, to add function declarations
to make it compile/run in some more environments.
Hacked by Bjorn Victor, 2004-2005, to support termios (Linux) and location setting.
*/
/* Hacked by Wojciech Gac, January 2015
Added #ifdef __OpenBSD__ conditions to use strlcpy() when possible.
This rids us of the compiler complaints on OpenBSD.
*/
/* Hacked by Klotz 2/20/89 to remove +%TDORS from init string.
* Hacked by Klotz 12/19/88 added response to TDORS.
* Hacked by Mly 9-Jul-87 to improve reading of supdup escape commands
* Hacked by Mly July 1987 to do bottom-of-screen cursor-positioning hacks
* when escape char is typed
* Hacked by Mly 29-Aug-87 to nuke stupid auto_right_margin lossage.
* TODO: Meta, Super, Hyper prefix keys.
* Deal with lossage when running on very narrow screen
* (Things like "SUPDUP command ->" should truncate)
* Defer printing message at bottom of screen if input chars are pending
* Try multiple other host addresses if first fails.
*/
#ifndef USE_TERMIOS
#define USE_TERMIOS 1 /* e.g. Linux */
#endif
#ifndef USE_BSD_SELECT
#define USE_BSD_SELECT 0 /* not e.g. Linux */
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <setjmp.h>
#include <netdb.h>
#include <curses.h>
#include <term.h>
#include <locale.h>
#include <langinfo.h>
#include "supdup.h"
#include "charmap.h"
#define OUTSTRING_BUFSIZ 2048
unsigned char *outstring;
#define TBUFSIZ 1024
unsigned char ttyobuf[TBUFSIZ];
unsigned char *ttyfrontp = ttyobuf;
unsigned char netobuf[TBUFSIZ];
unsigned char *netfrontp = netobuf;
unsigned char hisopts[256];
unsigned char myopts[256];
int connected = 0;
char myloc[128];
/* fd of network connection */
int net;
int showoptions = 0;
int options;
int debug = 0;
FILE *tdebug_file = 0; /* For debugging terminal output */
FILE *indebug_file = 0; /* For debugging network input */
#define TDEBUG_FILENAME "supdup-trmout"
#define INDEBUG_FILENAME "supdup-netin"
/* 0377 if terminal has a meta-key */
int mask = 0177;
int high_bits = 0;
/* user supdup command-escaper character */
unsigned char escape_char = ('^'&037);
/* As opposed to winningly-wrap */
int do_losingly_scroll = 0;
/* jmp_buf toplevel; */
jmp_buf peerdied;
int unicode_translation = 0;
/* Impoverished un*x keyboards */
#define Ctl(c) ((c)&037)
int sd(void);
void suspend(void);
void help(void);
void quit(void);
void rlogout(void);
void suprcv(void);
void command(unsigned char c);
void do_setloc(char *c);
void netflush(int d);
void setescape(void);
void top(void);
void status(void);
void setloc(void);
struct cmd
{
unsigned char name; /* command name */
char *help; /* help string */
void (*handler)(void); /* routine which executes command */
};
struct cmd cmdtab[] =
{
/* also q */
{ 'l', "logout connection and quit", rlogout },
{ 'c', "close connection and exit", quit },
/* also c-z */
{ 'p', "suspend supdup", suspend },
{ 'e', "set escape character", setescape },
{ 't', "set \"top\" bit on next character", top },
{ 's', "print status information", status },
{ 'L', "set console location", setloc }, /* [BV] */
/* also c-h */
{ '?', "print help information", help },
#if 0
{ 'r', "toggle mapping of received carriage returns", setcrmod },
{ 'd', "toggle debugging", setdebug },
{ 'v', "toggle viewing of options processing", setoptions },
#endif /* 0 */
{ 0 }
};
int currcol, currline; /* Current cursor position */
struct sockaddr_in tsin;
void sup_term(void);
void supdup (char *loc);
void intr(int), deadpeer(int);
char *key_name(int);
struct cmd *getcmd(void);
struct servent *sp;
#if !USE_TERMIOS
struct tchars otc;
struct ltchars oltc;
struct sgttyb ottyb;
#else
struct termios otio;
#endif
int mode(int);
void ttyoflush(void);
int putch (int c)
{
*ttyfrontp++ = c;
/*>>>>> LOSES if overflows */
return 1;
}
void put_newline ()
{
if (newline)
tputs (newline, 1, putch);
else
{
if (carriage_return)
tputs (carriage_return, 0, putch);
else
putch ('\r');
if (cursor_down)
tputs (cursor_down, 0, putch);
else
putch ('\n');
}
ttyoflush ();
}
#define term_goto(c, l) \
tputs (tparm (cursor_address, l, c), lines, putch)
char *hostname;
void
get_host (char *name)
{
struct hostent *host;
host = gethostbyname (name);
if (host)
{
tsin.sin_family = host->h_addrtype;
#ifdef notdef
bcopy (host->h_addr_list[0], (caddr_t) &tsin.sin_addr, host->h_length);
#else
bcopy (host->h_addr, (caddr_t) &tsin.sin_addr, host->h_length);
#endif /* h_addr */
hostname = host->h_name;
}
else
{
tsin.sin_family = AF_INET;
tsin.sin_addr.s_addr = inet_addr (name);
if (tsin.sin_addr.s_addr == -1)
hostname = 0;
else
hostname = name;
}
}
int
main (int argc, char **argv)
{
setlocale(LC_ALL, "");
myloc[0] = '\0';
sp = getservbyname ("supdup", "tcp");
if (sp == 0)
{
fprintf (stderr, "supdup: tcp/supdup: unknown service.\n");
exit (1);
}
#if !USE_TERMIOS
ioctl (0, TIOCGETP, (char *) &ottyb);
ioctl (0, TIOCGETC, (char *) &otc);
ioctl (0, TIOCGLTC, (char *) &oltc);
#else
tcgetattr(0, &otio);
#endif
setbuf (stdin, 0);
setbuf (stdout, 0);
do_losingly_scroll = 0;
// Before checking arguments, set a default value for unicode_translation.
// The computed value can be overridden using the -u or -U flags.
char *encoding = nl_langinfo(CODESET);
if(strcmp(encoding, "UTF-8") == 0) {
unicode_translation = 1;
}
else {
unicode_translation = 0;
}
if (argc > 1 && (!strcmp (argv[1], "-s") ||
!strcmp (argv[1], "-scroll")))
{
argc--; argv++;
do_losingly_scroll = 1;
}
if (argc > 1 && (!strcmp (argv[1], "-d") ||
!strcmp (argv[1], "-debug")))
{
argv++; argc--;
debug = 1;
}
if (argc > 1 && (!strcmp (argv[1], "-tdebug")))
{
argv++; argc--;
tdebug_file = fopen(TDEBUG_FILENAME, "wb"); /* Open for binary write */
if (tdebug_file == NULL)
{
fprintf (stderr, "Couldn't open debug file %s\n",
TDEBUG_FILENAME);
exit (1);
}
setbuf(tdebug_file, NULL); /* Unbuffered so see if we crash */
}
if (argc > 1 && !strcmp (argv[1], "-t"))
{
argv++, argc--;
indebug_file = fopen(INDEBUG_FILENAME, "wb"); /* Open for binary write */
if (indebug_file == NULL)
{
fprintf (stderr, "Couldn't open debug file %s\n",
INDEBUG_FILENAME);
exit (1);
}
}
if (argc > 1 && !strcmp(argv[1], "-loc"))
{
argv++, argc--;
if (argc > 1) {
#ifdef __OpenBSD__
strlcpy(myloc, argv[1], sizeof(myloc));
#else
strncpy(myloc, argv[1], sizeof(myloc));
#endif /* __OpenBSD__ */
argv++, argc--;
} else {
fprintf(stderr, "-loc requires an argument\n");
exit(1);
}
}
if (argc > 1 && !strcmp(argv[1], "-u"))
{
argv++;
argc--;
unicode_translation = 1;
}
if (argc > 1 && !strcmp(argv[1], "-U"))
{
argv++;
argc--;
unicode_translation = 0;
}
if (argc == 1)
{
char *cp;
char line[200];
again:
printf ("Host: ");
if (fgets(line, sizeof(line), stdin) == 0)
{
if (feof (stdin))
{
clearerr (stdin);
putchar ('\n');
}
goto again;
}
if ((cp = strchr(line, '\n')))
*cp = '\0';
get_host (line);
if (!hostname)
{
printf ("%s: unknown host.\n", line);
goto again;
}
}
else if (argc > 3)
{
fprintf(stderr,"usage: %s host-name [port] [-scroll]\n", argv[0]);
exit(1);
}
else
{
get_host (argv[1]);
if (!hostname)
{
fprintf(stderr,"%s: unknown host.\n", argv[1]);
exit (1);
}
}
tsin.sin_port = sp->s_port;
if (argc == 3)
{
tsin.sin_port = atoi (argv[2]);
if (tsin.sin_port <= 0)
{
fprintf(stderr,"%s: bad port number.\n", argv[2]);
exit(1);
}
tsin.sin_port = htons (tsin.sin_port);
}
net = socket (AF_INET, SOCK_STREAM, 0);
if (net < 0)
{
perror ("supdup: socket");
exit(1);
}
outstring = (unsigned char *) malloc (OUTSTRING_BUFSIZ);
if (outstring == 0)
{
fprintf (stderr, "Memory exhausted.\n");
exit (1);
}
sup_term ();
if (debug && setsockopt (net, SOL_SOCKET, SO_DEBUG, 0, 0) < 0)
perror ("setsockopt (SO_DEBUG)");
signal (SIGINT, intr);
signal (SIGPIPE, deadpeer);
printf("Trying %s ...", inet_ntoa (tsin.sin_addr));
fflush (stdout);
if (connect (net, (struct sockaddr *) &tsin, sizeof (tsin)) < 0)
/* >> Should try other addresses here (like BSD telnet) #ifdef h_addr */
{
perror ("supdup: connect");
signal (SIGINT, SIG_DFL);
exit(1);
}
connected = 1;
printf ("Connected to %s.\n", hostname);
printf ("Escape character is \"%s\".", key_name (escape_char));
fflush (stdout);
mode (1);
if (clr_eos)
tputs (clr_eos, lines - currline, putch);
put_newline ();
if (setjmp (peerdied) == 0)
supdup (myloc);
ttyoflush ();
mode (0);
fprintf (stderr, "Connection closed by %s.\n", hostname);
exit (0);
}
#define INIT_LEN 42 /* Number of bytes to send at initialization */
static char inits[] =
{
/* -wordcount,,0. should always be -6 */
077, 077, -6, 0, 0, 0,
/* TCTYP variable. Always 7 (supdup) */
0, 0, 0, 0, 0, 7,
/* TTYOPT variable. %TOMVB %TOMOR %TOLWR %TPCBS */
/* %TOSAI will be set if the user has enabled character translation */
1, 2, 020, 0, 0, 040,
/* Height of screen -- updated later */
0, 0, 0, 0, 0, 24,
/* Width of screen minus one -- updated later */
0, 0, 0, 0, 0, 79,
/* auto scroll number of lines */
0, 0, 0, 0, 0, 1,
/* TTYSMT */
0, 0, 0, 0, 0, 0
};
/*
* Initialize the terminal description to be sent when the connection is
* opened.
*/
void
sup_term (void)
{
int errret;
setupterm (0, 1, &errret);
if (errret == -1)
{
fprintf (stderr, "Bad terminfo database.\n");
exit (1);
}
else if (errret == 0)
{
fprintf (stderr, "Unknown terminal type.\n");
exit (1);
}
if (columns <= 1) {
int badcols = columns;
fprintf (stderr, "supdup: bogus # columns (%d), using %d\r\n",
badcols, columns = 80);
}
/*
*if (!cursor_address)
* {
* fprintf (stderr, "Can't position cursor on this terminal.\n");
* exit (1);
* }
*/
if (do_losingly_scroll) {
inits[13] |= 01;
}
inits[23] = lines & 077;
inits[22] = (lines >> 6) & 077;
{
int w;
if (auto_right_margin)
/* Brain death! Can't write in last column of last line
* for fear that stupid terminal will scroll up. Glag. */
columns = columns - 1;
/* Silly SUPDUP spec says that should specify (1- columns) */
w = columns - 1;
inits[29] = w & 077;
inits[28] = (w >> 6) & 077;
}
if (clr_eol) inits[12] |= 04;
if (over_strike) inits[13] |= 010;
if (cursor_address) inits[13] |= 04;
if (unicode_translation) inits[13] |= 060; // %TOSAI + %TOSA1
if (has_meta_key)
{
/* %TOFCI */
/* Don't do this -- it implies that we can generate full MIT 12-bit */
/* inits[14] |= 010; */
mask = 0377;
}
if ((delete_line || parm_delete_line) &&
(insert_line || parm_insert_line))
inits[14] |= 02;
if ((delete_character || parm_dch) &&
(insert_character || parm_ich))
inits[14] |= 01;
}
#if !USE_TERMIOS
struct tchars notc = { -1, -1, -1, -1, -1, -1 };
struct ltchars noltc = { -1, -1, -1, -1, -1, -1 };
#endif
int
mode (int f)
{
static int prevmode = 0;
#if !USE_TERMIOS
struct tchars *tc;
struct ltchars *ltc;
struct sgttyb sb;
#else
struct termios ntio;
#endif
int onoff, old;
if (prevmode == f)
return (f);
old = prevmode;
prevmode = f;
#if !USE_TERMIOS
sb = ottyb;
#else
memcpy(&ntio,&otio,sizeof(ntio));
#endif
switch (f)
{
case 0:
onoff = 0;
#if !USE_TERMIOS
tc = &otc;
ltc = &oltc;
#endif
break;
default:
#if !USE_TERMIOS
sb.sg_flags |= RAW; /* was CBREAK */
sb.sg_flags &= ~(ECHO|CRMOD);
sb.sg_flags |= LITOUT;
#ifdef PASS8
sb.sg_flags |= PASS8;
#endif
sb.sg_erase = sb.sg_kill = -1;
tc = ¬c;
ltc = &noltc;
#else
cfmakeraw(&ntio);
#endif
onoff = 1;
break;
}
#if !USE_TERMIOS
ioctl (fileno (stdin), TIOCSLTC, (char *) ltc);
ioctl (fileno (stdin), TIOCSETC, (char *) tc);
ioctl (fileno (stdin), TIOCSETP, (char *) &sb);
#else
tcsetattr(fileno(stdin), TCSANOW, &ntio);
#endif
ioctl (fileno (stdin), FIONBIO, &onoff);
ioctl (fileno (stdout), FIONBIO, &onoff);
return (old);
}
unsigned char sibuf[TBUFSIZ], *sbp;
unsigned char tibuf[TBUFSIZ], *tbp;
int scc;
int tcc;
int escape_seen;
int saved_col, saved_row;
void
restore (void)
{
if (cursor_address)
{
if ((escape_seen & 1) != 0)
{
term_goto (0, currline);
if (clr_eos)
tputs (clr_eos, lines - currline, putch);
}
term_goto (currcol = saved_col, currline = saved_row);
}
escape_seen = 0;
ttyoflush ();
}
void
clear_bottom_line (void)
{
if (cursor_address)
{
currcol = 0; currline = lines - 1;
term_goto (currcol, currline);
if (clr_eol)
tputs (clr_eol, columns, putch);
}
ttyoflush ();
}
int
read_char (void)
{
#if USE_BSD_SELECT
int readfds;
#else
fd_set readfds;
#endif
while (1)
{
tcc = read (fileno (stdin), tibuf, 1);
if (tcc >= 0 || errno != EWOULDBLOCK)
{
int c = (tcc <= 0) ? -1 : tibuf[0];
tcc = 0; tbp = tibuf;
return (c);
}
else
{
#if USE_BSD_SELECT
readfds = 1 << fileno (stdin);
select(32, &readfds, 0, 0, 0, 0);
#else
FD_SET(fileno(stdin),&readfds);
select(fileno(stdin)+1, &readfds, 0, 0, 0);
#endif
}
}
}
/*
* Select from tty and network...
*/
void
supdup (char *loc)
{
int c;
int tin = fileno (stdin), tout = fileno (stdout);
int on = 1;
#if !USE_BSD_SELECT
fd_set ibits, obits;
#endif
ioctl (net, FIONBIO, &on);
for (c = 0; c < INIT_LEN;)
*netfrontp++ = inits[c++];
/* [BV] AFTER inits! */
if (*loc != '\0')
do_setloc(loc);
scc = 0;
tcc = 0;
escape_seen = 0;
for (;;)
{
#if USE_BSD_SELECT
int ibits = 0, obits = 0;
#else
FD_ZERO(&ibits); FD_ZERO(&obits);
#endif
if (netfrontp != netobuf)
#if USE_BSD_SELECT
obits |= (1 << net);
#else
FD_SET(net, &obits);
#endif
else
#if USE_BSD_SELECT
ibits |= (1 << tin);
#else
FD_SET(tin, &ibits);
#endif
if (ttyfrontp != ttyobuf)
#if USE_BSD_SELECT
obits |= (1 << tout);
#else
FD_SET(tout, &obits);
#endif
else
#if USE_BSD_SELECT
ibits |= (1 << net);
#else
FD_SET(net, &ibits);
#endif
if (scc < 0 && tcc < 0)
break;
#if USE_BSD_SELECT
select (16, &ibits, &obits, 0, 0);
if (ibits == 0 && obits == 0)
{
sleep (5);
continue;
}
#else
{
int nfds = 0;
struct timeval tmo = { 60, 0 }; /* sleep max one minute */
nfds = select(16, &ibits, &obits, 0, &tmo);
if (nfds < 0)
{
perror("select");
sleep (5); /* nice error handling? */
continue;
} else if (nfds == 0) {
/* dummy command just to avoid timeout at other end */
/* #### not very friendly to the ITS - better fix that end */
*netfrontp++ = SUPDUP_ESCAPE;
*netfrontp++ = SUPDUP_LOCATION+040;
netflush(0);
continue;
}
}
#endif
/*
* Something to read from the network...
*/
#if USE_BSD_SELECT
if ((escape_seen == 0) && (ibits & (1 << net)))
#else
if ((escape_seen == 0) && (FD_ISSET(net, &ibits)))
#endif
{
scc = read (net, sibuf, sizeof (sibuf));
if (scc < 0 && errno == EWOULDBLOCK)
scc = 0;
else
{
if (scc <= 0) {
if (scc < 0) perror("read from net failed");
break;
}
sbp = sibuf;
if (indebug_file)
fwrite(sibuf, scc, 1, indebug_file);
}
}
/*
* Something to read from the tty...
*/
#if USE_BSD_SELECT
if (ibits & (1 << tin))
#else
if (FD_ISSET(tin, &ibits))
#endif
{
tcc = read (tin, tibuf, sizeof (tibuf));
if (tcc < 0 && errno == EWOULDBLOCK)
tcc = 0;
else
{
if (tcc <= 0) {
if (tcc < 0) perror("read from terminal failed");
break;
}
tbp = tibuf;
}
}
while (tcc > 0)
{
int c;
if ((&netobuf[sizeof(netobuf)] - netfrontp) < 2)
break;
c = *tbp++ & mask; tcc--;
if (escape_seen > 2)
{
/* ``restore'' the screen (or at least the cursorpos) */
restore ();
}
else if (escape_seen > 0)
{
escape_seen = escape_seen + 2;
command (c);
continue;
}
if (c == escape_char)
{
escape_seen = (tcc == 0) ? 1 : 2;
saved_col = currcol;
saved_row = currline;
if (tcc == 0)
{
clear_bottom_line ();
fprintf (stdout, "SUPDUP %s command -> ", hostname);
ttyoflush ();
}
continue;
}
if (c & 0200)
{
high_bits = 2;
c &= 0177;
}
if (c == ITP_ESCAPE)
*netfrontp++ = ITP_ESCAPE;
else if (high_bits)
{
*netfrontp++ = ITP_ESCAPE;
*netfrontp++ = high_bits + 0100;
high_bits = 0;
}
*netfrontp++ = c;
}
#if USE_BSD_SELECT
if ((obits & (1 << net)) && (netfrontp != netobuf))
#else
if (FD_ISSET(net, &obits) && (netfrontp != netobuf))
#endif
netflush (0);
if (scc > 0)
suprcv ();
#if USE_BSD_SELECT
if ((obits & (1 << tout)) && (ttyfrontp != ttyobuf))
#else
if (FD_ISSET(tout, &obits) && (ttyfrontp != ttyobuf))
#endif
ttyoflush ();
}
}
void
command (unsigned char chr)
{
struct cmd *c;
/* flush typeahead */
tcc = 0;
if (chr == escape_char)
{
*netfrontp++ = chr;
restore ();
return;
}
for (c = cmdtab; c->name; c++)
if (c->name == chr)
break;
if (!c->name && (chr >= 'A' && chr <= 'Z'))
for (c = cmdtab; c->name; c++)
if (c->name == (chr - 'A' + 'a'))
break;
if (c->name)
(*c->handler) ();
else if (chr == '\177' || chr == Ctl ('g'))
restore ();
else if (chr == Ctl ('z'))
suspend ();
else if (chr == Ctl ('h'))
help ();
else if (chr == 'q')
rlogout ();
else
{
clear_bottom_line ();
printf ("?Invalid SUPDUP command \"%s\"",
key_name (chr));
ttyoflush ();
return;
}
ttyoflush ();
if (!connected)
exit (1);
return;
}
void
status (void)
{
if (cursor_address)
{
currcol = 0; currline = lines - 3;
term_goto (currcol, currline);
if (clr_eos)
tputs (clr_eos, lines - currline, putch);
}
ttyoflush ();
if (connected)
printf ("Connected to %s.", hostname);
else
printf ("No connection.");
/* [BV] show location */
if (myloc[0] != '\0')
printf(" (Console location: \"%s\")", myloc);
ttyoflush ();
put_newline ();
printf ("Escape character is \"%s\".", key_name (escape_char));
ttyoflush ();
/* eat space, or unread others */
{
int c;
c = read_char ();
restore ();
if (c < 0)
return;
if (c == ' ')
return;
/* unread-char */
tibuf[0] = c; tcc = 1; tbp = tibuf;
}
}
void
suspend (void)
{
int save;
if (cursor_home)
tputs (cursor_home, 1, putch);
else if (cursor_address)
term_goto (0, 0);
if (clr_eol)
tputs (clr_eol, columns, putch);
ttyoflush ();
save = mode (0);
if (!cursor_address)
putchar ('\n');
kill (0, SIGTSTP);
/* reget parameters in case they were changed */
#if !USE_TERMIOS
ioctl (0, TIOCGETP, (char *) &ottyb);
ioctl (0, TIOCGETC, (char *) &otc);
ioctl (0, TIOCGLTC, (char *) &oltc);
#else
tcsetattr(0, TCSANOW, &otio);
#endif
(void) mode (save);
*netfrontp++ = ITP_ESCAPE; /* Tell other end that it sould refresh */
*netfrontp++ = ITP_PIATY; /* the screen */
restore ();
}
/*
* Help command.
*/
void
help (void)
{
struct cmd *c;
if (cursor_address)
{
for (c = cmdtab, currline = lines - 1 ;
c->name;
c++, currline--)
;
currcol = 0;
currline--; /* For pass-through `command' doc */
term_goto (currcol, currline);
if (clr_eos)
tputs (clr_eos, lines - currline, putch);
}
ttyoflush ();
printf ("Type \"%s\" followed by the command character. Commands are:",
key_name (escape_char));
ttyoflush ();
put_newline ();
printf (" %-8s%s",
key_name (escape_char),
"sends escape character through");
ttyoflush ();
for (c = cmdtab; c->name; c++)
{
put_newline ();
printf (" %-8s%s",