BSD 4_3_Tahoe release

[unix-history] / usr / src / new / xns / examples / gap / gaptelnet.c

#ifndef lint
static char *rcsid = "$Header: gaptelnet.c,v 2.2 86/05/16 11:03:33 jqj Exp $";
#endif

/*
* XNS User telnet program.
*/

/* $Log:        gaptelnet.c,v $
* Revision 2.2  86/05/16  11:03:33  jqj
* fix to correspond to new semantics for enumerations (global)
* 
* Revision 2.1  86/03/01  09:26:04  jqj
* Accept data with datastream=0 for the sake of incorrectly implemented
* servers (e.g. InterLisp-D).  If unrecognized inband controls arrive,
* don't choke.
* 
* Revision 2.0  85/11/21  07:23:04  jqj
* 4.3BSD standard release
* 
* Revision 1.3  85/11/20  14:00:08  jqj
* added symbolic entries for Gap connection types
* 
* Revision 1.2  85/05/22  09:46:37  jqj
* VAX 4.3beta baseline version
* 
* Revision 1.2  85/05/22  09:46:37  jqj
* Beta-test GAP telnet
* 
* based on tcp/telnet:
*      static char *rcsid = "$Header: gaptelnet.c,v 2.2 86/05/16 11:03:33 jqj Exp $";
*      static char sccsid[] = "@(#)telnet.c    4.24 (Berkeley) 7/20/83";
*/

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>

#include <netns/ns.h>
#include <netns/idp.h>
#include <netns/sp.h>           /* for spphdr */
#include <netns/spidp.h>

#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>

#include <xnscourier/Clearinghouse2.h>
#include "GAP3.h"
#include "gapcontrols.h"
#include <xnscourier/except.h>
#include <xnscourier/CH.h>

#define strip(x)        ((x)&0177)

char    ttyobuf[BUFSIZ], *tfrontp = ttyobuf, *tbackp = ttyobuf;
char    netobuf[BUFSIZ], *nfrontp = netobuf, *nbackp = netobuf;


int     connected;
CourierConnection *cconn;
int     net;
FILE    *logfile;
int     debug = 0;
int     crmod = 0;
char    *prompt;
char    escape = CTRL(]);
char    on = 1;

char    line[200];
int     margc;
char    *margv[20];

jmp_buf toplevel;
jmp_buf peerdied;

extern  int errno;

int     tn(), quit(), suspend(), bye(), help();
int     setescape(), status(), toggle(), setoptions();
int     setcrmod(), setdebug(), setlog();

#define HELPINDENT (sizeof ("connect"))

struct cmd {
       char    *name;          /* command name */
       char    *help;          /* help string */
       int     (*handler)();   /* routine which executes command */
};

char    openhelp[] =    "connect to a site";
char    closehelp[] =   "close current connection";
char    quithelp[] =    "exit telnet";
char    zhelp[] =       "suspend telnet";
char    debughelp[] =   "toggle debugging";
char    escapehelp[] =  "set escape character";
char    statushelp[] =  "print status information";
char    helphelp[] =    "print help information";
char    crmodhelp[] =   "toggle mapping of received carriage returns";
char    loghelp[] =     "toggle logging of session";

struct cmd cmdtab[] = {
       { "open",       openhelp,       tn },
       { "close",      closehelp,      bye },
       { "quit",       quithelp,       quit },
       { "z",          zhelp,          suspend },
       { "escape",     escapehelp,     setescape },
       { "status",     statushelp,     status },
/*      { "crmod",      crmodhelp,      setcrmod },     */
       { "debug",      debughelp,      setdebug },
       { "log",        loghelp,        setlog },
       { "?",          helphelp,       help },
       0
};

struct sockaddr_ns sin;

int     intr(), deadpeer();
char    *control();
struct  cmd *getcmd();

struct  tchars otc;
struct  ltchars oltc;
struct  sgttyb ottyb;

char    *hostname;
char    hnamebuf[45];


main(argc, argv)
       int argc;
       char *argv[];
{
       ioctl(0, TIOCGETP, (char *)&ottyb);
       ioctl(0, TIOCGETC, (char *)&otc);
       ioctl(0, TIOCGLTC, (char *)&oltc);
       setbuf(stdin, 0);
       setbuf(stdout, 0);
       prompt = argv[0];
       if (argc > 1 && !strcmp(argv[1], "-d"))
               debug = SO_DEBUG, argv++, argc--;
       if (argc != 1) {
               if (setjmp(toplevel) != 0)
                       exit(0);
               tn(argc, argv);
       }
       setjmp(toplevel);
       for (;;)
               command(1);
}

tn(argc, argv)
       int argc;
       char *argv[];
{
       register int c;
       register struct ns_addr *host;
       extern struct ns_addr *getXNSaddr();
       Clearinghouse2_ObjectName hostoname, hdefault;
       LongCardinal servicetype;

       if (connected) {
               printf("?Already connected to %s\n", hostname);
               return;
       }
       if (argc < 2) {
               strcpy(line, "Connect ");
               printf("(to) ");
               gets(&line[strlen(line)]);
               makeargv();
               argc = margc;
               argv = margv;
       }
       if (argc > 3) {
               printf("usage: %s host-name [service-type]\n", argv[0]);
               return;
       }
       if (argc == 2) servicetype = TTYService_sa;     /* default to 1 */
       else if (strcmp(argv[2],"sa") == 0) servicetype = TTYService_sa;
       else if (strncmp(argv[2],"re",2) == 0 ||
                strcmp(argv[2],"exec") == 0) servicetype = TTYService_exec;
       else if (strcmp(argv[2],"its") == 0) servicetype = TTYService_its;
       else servicetype = atoi(argv[2]);
       CH_NameDefault(&hdefault);
       hostoname = CH_StringToName(argv[1], &hdefault);
       if ((host = CH_LookupAddrDN(hostoname,0,hnamebuf,sizeof(hnamebuf)))) {
               sin.sns_family = AF_NS;
               host->x_port = htons(IDPPORT_COURIER);
               bcopy(host, (caddr_t)&sin.sns_addr, sizeof(host));
               /* hnamebuf is filled in by CH_LookupAddrDN */
               hostname = hnamebuf;
       } else if ((host = getXNSaddr(argv[1]))) {
               sin.sns_family = AF_NS;
               bcopy(host, (caddr_t)&sin.sns_addr, sizeof(host));
               strcpy(hnamebuf, argv[1]);
               hostname = hnamebuf;
       } else {                        
               printf("%s: unknown host\n", argv[1]);
               return;
       }
       cconn = CourierOpen(host);
       if(cconn == NULL) {
               fprintf(stderr,"Courier connection failed\n");
               return;
       }
       net = *(int*)cconn;
       signal(SIGINT, intr);
       signal(SIGPIPE, deadpeer);
       printf("Trying...\n");
       if (createsession(cconn,servicetype) < 0)
         return;
       connected++;
       call(status, "status", 0);
       sleep(1);
       if (setjmp(peerdied) == 0)
               telnet(net);
       fprintf(stderr, "\nConnection closed by foreign host.\n");
       exit(1);
}

/*
* create a session
*/
createsession(cconn, servicetype)
       CourierConnection *cconn;
       LongCardinal servicetype;
{
       GAP3_SessionParameterObject pobj;
       GAP3_TransportObject tobjs[2];
       GAP3_CommParamObject *cp;
       struct {
               Cardinal length;
               GAP3_TransportObject *sequence;
       } tobjlist;
       Authentication1_Credentials creds;
       Authentication1_Verifier verifier;

       pobj.designator = GAP3_oldTtyHost; /* 11 */
       pobj.GAP3_oldTtyHost_case.charLength = GAP3_seven;
       pobj.GAP3_oldTtyHost_case.parity = GAP3_none;
       pobj.GAP3_oldTtyHost_case.stopBits = GAP3_oneStopBit;
       pobj.GAP3_oldTtyHost_case.frameTimeout = 20;
/*
       tobjs[0].designator = GAP3_rs232c;
       cp = &tobjs[0].GAP3_rs232c_case.commParams;
       cp->accessDetail.designator = GAP3_directConn;
       cp->accessDetail.directConn_case.duplex = GAP3_fullduplex;
       cp->accessDetail.directConn_case.lineType = GAP3_asynchronous;
       cp->accessDetail.directConn_case.lineSpeed = GAP3_bps300;
       tobjs[0].rs232c_case.preemptOthers = GAP3_preemptInactive;
       tobjs[0].rs232c_case.preemptMe = GAP3_preemptInactive;
       tobjs[0].rs232c_case.phoneNumber = "";
       tobjs[0].rs232c_case.line.designator = GAP3_reserveNeeded;
       tobjs[0].rs232c_case.line.reserveNeeded_case.lineNumber = 1;
*/
       tobjs[0].designator = GAP3_service;
       tobjs[0].GAP3_service_case.id = servicetype; /* 1 == SA */

       tobjs[1].designator = GAP3_teletype;
       tobjlist.length = 2;
       tobjlist.sequence = tobjs;
       MakeSimpleCredsAndVerifier(0, 0, &creds, &verifier);
       DURING
         (void) GAP3_Create(cconn, NULL, pobj, tobjlist, 0, creds, verifier);
       HANDLER {
               char *msg;
               switch (Exception.Code) {
               case GAP3_mediumConnectFailed:
                       msg = "medium connect failed";
                       break;
               case GAP3_illegalTransport:
                       msg = "illegal transport type";
                       break;
               case GAP3_tooManyGateStreams:
               case GAP3_serviceTooBusy:
                       msg = "insufficient resources";
                       break;
               case GAP3_serviceNotFound:
                       msg = "service type not found";
                       break;
               case GAP3_userNotAuthenticated:
               case GAP3_userNotAuthorized:
                       msg = "authentication problem";
                       break;
               case REJECT_ERROR:
                       switch (CourierErrArgs(rejectionDetails,designator)){
                       case noSuchProgramNumber:
                               msg = "server does not support GAP";
                               break;
                       case noSuchVersionNumber:
                               msg = "server does not support our GAP version";
                               break;
                       default:
                               msg = "connection rejected";
                       }
                       break;
               case PROTOCOL_VIOLATION:
                       msg = "protocol violation by remote server";
                       break;
               default:
                       msg = "some random error";
                       break;
               }
               fprintf(stderr,"Error creating connection, %s\n",
                       msg);
               return(-1);
       } END_HANDLER;
       return(0);
}

/*
* Print status about the connection.
*/
/*VARARGS*/
status()
{
       if (connected)
               printf("Connected to %s.\n", hostname);
       else
               printf("No connection.\n");
       printf("Escape character is '%s'.\n", control(escape));
       fflush(stdout);
}

makeargv()
{
       register char *cp;
       register char **argp = margv;

       margc = 0;
       for (cp = line; *cp;) {
               while (isspace(*cp))
                       cp++;
               if (*cp == '\0')
                       break;
               *argp++ = cp;
               margc += 1;
               while (*cp != '\0' && !isspace(*cp))
                       cp++;
               if (*cp == '\0')
                       break;
               *cp++ = '\0';
       }
       *argp++ = 0;
}

/*VARARGS*/
suspend()
{
       register int save;

       save = mode(0);
       kill(0, SIGTSTP);
       /* reget parameters in case they were changed */
       ioctl(0, TIOCGETP, (char *)&ottyb);
       ioctl(0, TIOCGETC, (char *)&otc);
       ioctl(0, TIOCGLTC, (char *)&oltc);
       (void) mode(save);
}

/*VARARGS*/
bye()
{
       register char *op;

       (void) mode(0);
       if (connected) {
               sendoobdata(GAPCTLcleanup);
               setsockopt(net, NSPROTO_SPP, SO_HEADERS_ON_OUTPUT, &on,
                          sizeof(on));
               sppclose(net);
               printf("Connection closed.\n");
               connected = 0;
       }
}

/*VARARGS*/
quit()
{
       call(bye, "bye", 0);
       exit(0);
}

/*
* Toggle debugging
*/
setdebug(argc, argv)
{
       debug = ~debug;
}

/*
* Toggle logging
*/
setlog(argc, argv)
       int argc;
       char *argv[];
{
       if (argc > 2)
               printf("Syntax: %s [filename]\n",argv[0]);
       else if (logfile != (FILE*) 0) {
               /* currently logging */
               fclose(logfile);
               printf("Log file closed\n");
               logfile = (FILE*) 0;
               if (argc == 2 && (logfile = fopen(argv[1],"a")) != (FILE*)0)
                       printf("Logging to %s\n",argv[1]);
       } else {
               /* not currently logging */
               if (argc == 1)
                       printf("Logging already disabled\n");
               else if (argc == 2 && 
                        (logfile = fopen(argv[1],"a")) != (FILE*)0 )
                       printf("Logging to %s\n",argv[1]);
       }
}

/*
* Help command.
*/
help(argc, argv)
       int argc;
       char *argv[];
{
       register struct cmd *c;

       if (argc == 1) {
               printf("Commands may be abbreviated.  Commands are:\n\n");
               for (c = cmdtab; c->name; c++)
                       printf("%-*s\t%s\n", HELPINDENT, c->name, c->help);
               return;
       }
       while (--argc > 0) {
               register char *arg;
               arg = *++argv;
               c = getcmd(arg);
               if (c == (struct cmd *)-1)
                       printf("?Ambiguous help command %s\n", arg);
               else if (c == (struct cmd *)0)
                       printf("?Invalid help command %s\n", arg);
               else
                       printf("%s\n", c->help);
       }
}

/*
* Call routine with argc, argv set from args (terminated by 0).
* VARARGS2
*/
call(routine, args)
       int (*routine)();
       int args;
{
       register int *argp;
       register int argc;

       for (argc = 0, argp = &args; *argp++ != 0; argc++)
               ;
       (*routine)(argc, &args);
}

struct  tchars notc =   { -1, -1, -1, -1, -1, -1 };
struct  ltchars noltc = { -1, -1, -1, -1, -1, -1 };

mode(f)
       register int f;
{
       static int prevmode = 0;
       struct tchars *tc;
       struct ltchars *ltc;
       struct sgttyb sb;
       int onoff, old;

       if (prevmode == f)
               return (f);
       old = prevmode;
       prevmode = f;
       sb = ottyb;
       switch (f) {

       case 0:
               onoff = 0;
               tc = &otc;
               ltc = &oltc;
               break;

       case 1:
       case 2:
               sb.sg_flags |= CBREAK;
               if (f == 1)
                       sb.sg_flags &= ~(ECHO|CRMOD);
               else
                       sb.sg_flags |= ECHO|CRMOD;
               sb.sg_erase = sb.sg_kill = -1;
               tc = &notc;
               ltc = &noltc;
               onoff = 1;
               break;

       default:
               return (old);
       }
       ioctl(fileno(stdin), TIOCSLTC, (char *)ltc);
       ioctl(fileno(stdin), TIOCSETC, (char *)tc);
       ioctl(fileno(stdin), TIOCSETP, (char *)&sb);
       ioctl(fileno(stdin), FIONBIO, &onoff);
       ioctl(fileno(stdout), FIONBIO, &onoff);
       return (old);
}

struct {struct sphdr hdr;
       char data[BUFSIZ];
} sibuf;
char    *sbp;
char    tibuf[BUFSIZ], *tbp;
int     scc, tcc;

/*
* Select from tty and network...
*/
telnet(s)
       int s;
{
       register int c;
       int tin = fileno(stdin), tout = fileno(stdout);
       int on = 1;
       int ibits, obits;

       (void) mode(1);
       ioctl(s, FIONBIO, &on);
       changeSPPopts(net, GAPCTLnone, 1); /* datastream "normal", eom */
       for (;;) {
               ibits = obits = 0;
               if (nfrontp - nbackp)
                       obits |= (1 << s);
               else
                       ibits |= (1 << tin);
               if (tfrontp - tbackp)
                       obits |= (1 << tout);
               else
                       ibits |= (1 << s);
               if (scc < 0 && tcc < 0)
                       break;
               select(16, &ibits, &obits, 0, 0);
               if (ibits == 0 && obits == 0) {
                       sleep(5);
                       continue;
               }

               /*
                * Something to read from the network...
                */
               if (ibits & (1 << s)) {
                       scc = read(s, &sibuf, sizeof (sibuf))
                         - sizeof(struct sphdr);
#ifdef DEBUG
                       if (debug)
                         printf("reading %d bytes from net\n", scc);
#endif
                       if (scc < 0 && errno == EWOULDBLOCK)
                               scc = 0;
                       else if (scc < 0)
                               break; /* protocol violation? */
                       else if (sibuf.hdr.sp_cc & SP_OB) {
                               /* status or OOB control */
                               switch ((u_char) *sibuf.data) {
                               case GAPCTLareYouThere:
                                       sendoobdata(GAPCTLiAmHere);
                                       break;
                               case GAPCTLmediumDown:
                                       (void) mode(0);
                                       longjmp(peerdied, -1);
                                       /*NOTREACHED*/
                               default:
                                       /* ignore others */
                                       break;
                               }
                               scc = 0;
                       }
                       else if (sibuf.hdr.sp_dt == GAPCTLnone ||       
                                sibuf.hdr.sp_dt == 0) {
                               /* normal case, plus Lisp bogosity */
                               sbp = sibuf.data;
                       }
                       else if(sibuf.hdr.sp_dt == GAPCTLcleanup){
                               sendoobdata(GAPCTLcleanup);
                               /* should get an END next */
                               scc = 0;
                       }
                       else if(sibuf.hdr.sp_dt == SPPSST_END) {
                               setsockopt(net, NSPROTO_SPP, 
                                       SO_HEADERS_ON_OUTPUT,
                                       &on, sizeof(on));
                               sppclosereply(net);
                               (void) mode(0);
                               longjmp(peerdied, -1);
                               /*NOTREACHED*/
                       }
                       else scc = 0;   /* ignore other inband controls */
               }

               /*
                * Something to read from the tty...
                */
               if (ibits & (1 << tin)) {
                       tcc = read(tin, tibuf, sizeof (tibuf));
                       if (tcc < 0 && errno == EWOULDBLOCK)
                               tcc = 0;
                       else {
                               if (tcc <= 0)
                                       break;
                               tbp = tibuf;
                       }
               }

               while (tcc > 0) {
                       register int c;

                       if ((&netobuf[BUFSIZ] - nfrontp) < 2)
                               break;
                       c = *tbp++ & 0377, tcc--;
                       if (strip(c) == escape) {
                               command(0);
                               tcc = 0;
                               break;
                       }
                       /* We don't do any input translation at the moment */
#ifdef notdef
                       switch (c) {
                       case '\n':
                               *nfrontp++ = '\r';
                               *nfrontp++ = '\n';
                               break;
                       case '\r':
                               *nfrontp++ = '\r';
                               *nfrontp++ = '\n';
                               break;
                       default:
                               *nfrontp++ = c;
                               break;
                       }
#else
                       *nfrontp++ = c;
#endif /* notdef */
               }
               if ((obits & (1 << s)) && (nfrontp - nbackp) > 0)
                       netflush(s);
               while (scc > 0) {
                       register int c;
                       c = *sbp++&0377; scc--;
                       /* nor do we do any output translation */
                       *tfrontp++ = c;
               }
               if ((obits & (1 << tout)) && (tfrontp - tbackp) > 0)
                       ttyflush(tout);
       }
       (void) mode(0);
}

command(top)
       int top;
{
       register struct cmd *c;
       int oldmode, wasopen;

       oldmode = mode(0);
       if (!top)
               putchar('\n');
       else
               signal(SIGINT, SIG_DFL);
       for (;;) {
               printf("%s> ", prompt);
               if (gets(line) == 0) {
                       if (feof(stdin)) {
                               clearerr(stdin);
                               putchar('\n');
                       }
                       break;
               }
               if (line[0] == 0)
                       break;
               makeargv();
               c = getcmd(margv[0]);
               if (c == (struct cmd *)-1) {
                       printf("?Ambiguous command\n");
                       continue;
               }
               if (c == 0) {
                       printf("?Invalid command\n");
                       continue;
               }
               (*c->handler)(margc, margv);
               if (c->handler != help)
                       break;
       }
       if (!top) {
               if (!connected)
                       longjmp(toplevel, 1);
               (void) mode(oldmode);
       }
}

/*
* Set the escape character.
*/
setescape(argc, argv)
       int argc;
       char *argv[];
{
       register char *arg;
       char buf[50];

       if (argc > 2)
               arg = argv[1];
       else {
               printf("new escape character: ");
               gets(buf);
               arg = buf;
       }
       if (arg[0] != '\0')
               escape = arg[0];
       printf("Escape character is '%s'.\n", control(escape));
       fflush(stdout);
}

/*
* Construct a control character sequence
* for a special character.
*/
char *
control(c)
       register int c;
{
       static char buf[3];

       if (c == 0177)
               return ("^?");
       if (c >= 040) {
               buf[0] = c;
               buf[1] = 0;
       } else {
               buf[0] = '^';
               buf[1] = '@'+c;
               buf[2] = 0;
       }
       return (buf);
}

struct cmd *
getcmd(name)
       register char *name;
{
       register char *p, *q;
       register struct cmd *c, *found;
       register int nmatches, longest;

       longest = 0;
       nmatches = 0;
       found = 0;
       for (c = cmdtab; p = c->name; c++) {
               for (q = name; *q == *p++; q++)
                       if (*q == 0)            /* exact match? */
                               return (c);
               if (!*q) {                      /* the name was a prefix */
                       if (q - name > longest) {
                               longest = q - name;
                               nmatches = 1;
                               found = c;
                       } else if (q - name == longest)
                               nmatches++;
               }
       }
       if (nmatches > 1)
               return ((struct cmd *)-1);
       return (found);
}

deadpeer()
{
       (void) mode(0);
       longjmp(peerdied, -1);
}

intr()
{
       (void) mode(0);
       longjmp(toplevel, -1);
}

ttyflush(fd)
{
       register int n;

       if ((n = tfrontp - tbackp) > 0) {
               if (logfile != (FILE*)0)
                       fwrite(tbackp, 1, n, logfile);
               n = write(fd, tbackp, n);
       }
       if (n < 0)
               return;
       tbackp += n;
       if (tbackp == tfrontp)
               tbackp = tfrontp = ttyobuf;
}

netflush(fd)
{
       int n;

       if ((n = nfrontp - nbackp) > 0)
               n = write(fd, nbackp, n);
#ifdef DEBUG
       if (debug)
         printf("writing %d of %d bytes to net\n", n, nfrontp-nbackp);
#endif
       if (n < 0) {
               if (errno != ENOBUFS && errno != EWOULDBLOCK) {
                       (void) mode(0);
                       perror(hostname);
                       close(fd);
                       longjmp(peerdied, -1);
                       /*NOTREACHED*/
               }
               n = 0;
       }
       nbackp += n;
       if (nbackp == nfrontp)
               nbackp = nfrontp = netobuf;
}

/*
* Send out of band data to other end of network
*/
sendoobdata(value)
       char value;
{
       send(net, &value, 1, MSG_OOB);
}

changeSPPopts(s, stream, eom)
       int s;                  /* SPP socket */
       u_char stream;          /* datastream type */
       char eom;               /* Boolean EOM */
{
       struct sphdr sphdr;
       int off = 0;

       sphdr.sp_dt = stream;
       sphdr.sp_cc = (eom ? SP_EM : 0);
       setsockopt(s, NSPROTO_SPP, SO_HEADERS_ON_OUTPUT, &off, sizeof(off));
       setsockopt(s, NSPROTO_SPP, SO_DEFAULT_HEADERS, &sphdr, sizeof(sphdr));
}