src/client.c

   1 /*
   2  * C Client for the DX Spider cluster program
   3  *
   4  * Eventually this program will be a complete replacement
   5  * for the perl version.
   6  *
   7  * This program provides the glue necessary to talk between
   8  * an input (eg from telnet or ax25) and the perl DXSpider
   9  * node.
  10  *
  11  * Currently, this program connects STDIN/STDOUT to the
  12  * message system used by cluster.pl
  13  *
  14  * Copyright (c) 2000 Dirk Koopman G1TLH
  15  *
  16  * $Id$
  17  */
  18
  19 #include <stdio.h>
  20 #include <sys/time.h>
  21 #include <sys/types.h>
  22 #include <unistd.h>
  23 #include <ctype.h>
  24 #include <stdlib.h>
  25 #include <stdarg.h>
  26 #include <netdb.h>
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <errno.h>
  30 #include <signal.h>
  31 #include <string.h>
  32 #include <termios.h>
  33 #include <regex.h>
  34
  35 #include "sel.h"
  36 #include "cmsg.h"
  37 #include "debug.h"
  38
  39 #define TEXT 1
  40 #define MSG 2
  41 #define MAXBUFL 1024
  42
  43 #ifndef MAXPATHLEN
  44 #define MAXPATHLEN 256
  45 #endif
  46
  47 #define DEFPACLEN 128
  48 #define MAXPACLEN 236
  49 #define MAXCALLSIGN 9
  50
  51 #define DBUF 1
  52 #define DMSG 2
  53
  54 typedef struct
  55 {
  56         int cnum;                                       /* the connection number */
  57         int sort;                                       /* the type of connection either text or msg */
  58         cmsg_t *in;                                     /* current input message being built up */
  59         cmsg_t *out;                            /* current output message being sent */
  60         cmsg_t *obuf;                           /* current output being buffered */
  61         reft *inq;                                      /* input queue */
  62         reft *outq;                                     /* output queue */
  63         sel_t *sp;                                      /* my select fcb address */
  64         struct termios t;                       /* any termios associated with this cnum */
  65         char echo;                                      /* echo characters back to this cnum */
  66         char t_set;                                     /* the termios structure is valid */
  67         char buffer_it;                         /* buffer outgoing packets for paclen */
  68 } fcb_t;
  69
  70 typedef struct
  71 {
  72         char *in;
  73         regex_t *regex;
  74 } myregex_t;
  75
  76
  77 char *node_addr = "localhost";  /* the node tcp address, can be overridden by DXSPIDER_HOST */
  78 int node_port = 27754;                  /* the tcp port of the node at the above address can be overidden by DXSPIDER_PORT*/
  79 char *call;                                             /* the caller's callsign */
  80 char *connsort;                                 /* the type of connection */
  81 fcb_t *in;                                              /* the fcb of 'stdin' that I shall use */
  82 fcb_t *node;                                    /* the fcb of the msg system */
  83 char nl = '\n';                                 /* line end character */
  84 char ending = 0;                                /* set this to end the program */
  85 char send_Z = 1;                                /* set a Z record to the node on termination */
  86 char echo = 1;                                  /* echo characters on stdout from stdin */
  87 char int_tabs = 0;                              /* interpret tabs -> spaces */
  88 char *root = "/spider";         /* root of data tree, can be overridden by DXSPIDER_ROOT  */
  89 int timeout = 60;                               /* default timeout for logins and things */
  90 int paclen = DEFPACLEN;                 /* default buffer size for outgoing packets */
  91 int tabsize = 8;                                /* default tabsize for text messages */
  92
  93 myregex_t iscallreg[] = {               /* regexes to determine whether this is a reasonable callsign */
  94         {
  95                 "^[A-Z]+[0-9]+[A-Z]+[1-9]?$", 0                /* G1TLH G1TLH1 */
  96         },
  97         {
  98                 "^[0-9]+[A-Z]+[0-9]+[A-Z]+[1-9]?$", 0          /* 2E0AAA 2E0AAA1 */
  99         },
 100         {
 101                 "^[A-Z]+[0-9]+[A-Z]+-[1-9]$", 0                /* G1TLH-2 */
 102         },
 103         {
 104                 "^[0-9]+[A-Z]+[0-9]+[A-Z]+-[1-9]$", 0          /* 2E0AAA-2 */
 105         },
 106         {
 107                 "^[A-Z]+[0-9]+[A-Z]+-1[0-5]$", 0               /* G1TLH-11 */
 108         },
 109         {
 110                 "^[0-9]+[A-Z]+[0-9]+[A-Z]+-1[0-5]$", 0         /* 2E0AAA-11 */
 111         },
 112         {
 113                 0, 0
 114         }
 115 };
 116
 117 void terminate(int);
 118
 119 /*
 120  * utility routines - various
 121  */
 122
 123 void die(char *s, ...)
 124 {
 125         char buf[2000];
 126
 127         va_list ap;
 128         va_start(ap, s);
 129         vsnprintf(buf, sizeof(buf)-1, s, ap);
 130         va_end(ap);
 131         fprintf(stderr,"%s\n", buf);
 132         terminate(-1);
 133 }
 134
 135 char *strupper(char *s)
 136 {
 137         char *d = malloc(strlen(s)+1);
 138         char *p = d;
 139
 140         if (!d)
 141                 die("out of room in strupper");
 142         while (*p++ = toupper(*s++)) ;
 143         return d;
 144 }
 145
 146 char *strlower(char *s)
 147 {
 148         char *d = malloc(strlen(s)+1);
 149         char *p = d;
 150
 151         if (!d)
 152                 die("out of room in strlower");
 153         while (*p++ = tolower(*s++)) ;
 154         return d;
 155 }
 156
 157 int eq(char *a, char *b)
 158 {
 159         return (strcmp(a, b) == 0);
 160 }
 161
 162 int xopen(char *dir, char *name, int mode)
 163 {
 164         char fn[MAXPATHLEN+1];
 165         snprintf(fn, MAXPATHLEN, "%s/%s/%s", root, dir, name);
 166         return open(fn, mode);
 167 }
 168
 169 int iscallsign(char *s)
 170 {
 171         myregex_t *rp;
 172
 173         if (strlen(s) > MAXCALLSIGN)
 174                 return 0;
 175
 176         for (rp = iscallreg; rp->in; ++rp) {
 177                 if (regexec(rp->regex, s, 0, 0, 0) == 0)
 178                         return 1;
 179         }
 180         return 0;
 181 }
 182
 183 /*
 184  * higher level send and receive routines
 185  */
 186
 187 fcb_t *fcb_new(int cnum, int sort)
 188 {
 189         fcb_t *f = malloc(sizeof(fcb_t));
 190         if (!f)
 191                 die("no room in fcb_new");
 192         memset (f, 0, sizeof(fcb_t));
 193         f->cnum = cnum;
 194         f->sort = sort;
 195         f->inq = chain_new();
 196         f->outq = chain_new();
 197         return f;
 198 }
 199
 200 void flush_text(fcb_t *f)
 201 {
 202         if (f->obuf) {
 203                 cmsg_send(f->outq, f->obuf, 0);
 204                 f->sp->flags |= SEL_OUTPUT;
 205                 f->obuf = 0;
 206         }
 207 }
 208
 209 void send_text(fcb_t *f, char *s, int l)
 210 {
 211         cmsg_t *mp;
 212         char *p;
 213
 214         if (f->buffer_it && f->obuf) {
 215                 mp = f->obuf;
 216         } else {
 217                 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
 218         }
 219
 220         /* remove trailing spaces  */
 221         while (l > 0 &&isspace(s[l-1]))
 222                 --l;
 223
 224         for (p = s; p < s+l; ) {
 225                 if (mp->inp >= mp->data + paclen) {
 226                         flush_text(f);
 227                         f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
 228                 }
 229                 *mp->inp++ = *p++;
 230         }
 231         if (mp->inp >= mp->data + paclen) {
 232                 flush_text(f);
 233                 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
 234         }
 235         *mp->inp++ = nl;
 236         if (!f->buffer_it)
 237                 flush_text(f);
 238 }
 239
 240 void send_msg(fcb_t *f, char let, char *s, int l)
 241 {
 242         cmsg_t *mp;
 243         int ln;
 244         int myl = strlen(call)+2+l;
 245
 246         mp = cmsg_new(myl+4+1, f->sort, f);
 247         ln = htonl(myl);
 248         memcpy(mp->inp, &ln, 4);
 249         mp->inp += 4;
 250         *mp->inp++ = let;
 251         strcpy(mp->inp, call);
 252         mp->inp += strlen(call);
 253         *mp->inp++ = '|';
 254         if (l > 0) {
 255                 memcpy(mp->inp, s, l);
 256                 mp->inp += l;
 257         }
 258         *mp->inp = 0;
 259         cmsg_send(f->outq, mp, 0);
 260         f->sp->flags |= SEL_OUTPUT;
 261 }
 262
 263 /*
 264  * the callback (called by sel_run) that handles all the inputs and outputs
 265  */
 266
 267 int fcb_handler(sel_t *sp, int in, int out, int err)
 268 {
 269         fcb_t *f = sp->fcb;
 270         cmsg_t *mp, *omp;
 271
 272         /* input modes */
 273         if (in) {
 274                 char *p, buf[MAXBUFL];
 275                 int r;
 276
 277                 /* read what we have into a buffer */
 278                 r = read(f->cnum, buf, MAXBUFL);
 279                 if (r < 0) {
 280                         switch (errno) {
 281                         case EINTR:
 282                         case EINPROGRESS:
 283                         case EAGAIN:
 284                                 goto lout;
 285                         default:
 286                                 if (f->sort == MSG)
 287                                         send_Z = 0;
 288                                 ending++;
 289                                 return 0;
 290                         }
 291                 } else if (r == 0) {
 292                         if (f->sort == MSG)
 293                                 send_Z = 0;
 294                         ending++;
 295                         return 0;
 296                 }
 297
 298                 dbgdump(DBUF, "in ->", buf, r);
 299
 300                 /* create a new message buffer if required */
 301                 if (!f->in)
 302                         f->in = cmsg_new(MAXBUFL+1, f->sort, f);
 303                 mp = f->in;
 304
 305                 switch (f->sort) {
 306                 case TEXT:
 307                         p = buf;
 308                         if (f->echo)
 309                                 omp = cmsg_new(3*r+1, f->sort, f);
 310                         while (r > 0 && p < &buf[r]) {
 311
 312                                 /* echo processing */
 313                                 if (f->echo) {
 314                                         switch (*p) {
 315                                         case '\b':
 316                                         case 0x7f:
 317                                                 strcpy(omp->inp, "\b \b");
 318                                                 omp->inp += strlen(omp->inp);
 319                                                 break;
 320                                         default:
 321                                                 *omp->inp++ = *p;
 322                                         }
 323                                 }
 324
 325                                 /* character processing */
 326                                 switch (*p) {
 327                                 case '\t':
 328                                         if (int_tabs) {
 329                                                 memset(mp->inp, ' ', tabsize);
 330                                                 mp->inp += tabsize;
 331                                                 ++p;
 332                                         } else {
 333                                                 *mp->inp++ = *p++;
 334                                         }
 335                                         break;
 336                                 case '\b':
 337                                 case 0x7f:
 338                                         if (mp->inp > mp->data)
 339                                                 mp->inp--;
 340                                         ++p;
 341                                         break;
 342                                 default:
 343                                         if (nl == '\n' && *p == '\r') {   /* ignore \r in telnet mode (ugh) */
 344                                                 p++;
 345                                         } else if (*p == nl) {
 346                                                 if (mp->inp == mp->data)
 347                                                         *mp->inp++ = ' ';
 348                                                 *mp->inp = 0;              /* zero terminate it, but don't include it in the length */
 349                                                 dbgdump(DMSG, "QUEUE TEXT", mp->data, mp->inp-mp->data);
 350                                                 cmsg_send(f->inq, mp, 0);
 351                                                 f->in = mp = cmsg_new(MAXBUFL+1, f->sort, f);
 352                                                 ++p;
 353                                         } else {
 354                                                 if (mp->inp < &mp->data[MAXBUFL-8])
 355                                                         *mp->inp++ = *p++;
 356                                                 else {
 357                                                         mp->inp = mp->data;
 358                                                 }
 359                                         }
 360                                 }
 361                         }
 362
 363                         /* queue any echo text */
 364                         if (f->echo) {
 365                                 dbgdump(DMSG, "QUEUE ECHO TEXT", omp->data, omp->inp - omp->data);
 366                                 cmsg_send(f->outq, omp, 0);
 367                                 f->sp->flags |= SEL_OUTPUT;
 368                         }
 369
 370                         break;
 371
 372                 case MSG:
 373                         p = buf;
 374                         while (r > 0 && p < &buf[r]) {
 375
 376                                 /* build up the size into the likely message length (yes I know it's a short) */
 377                                 switch (mp->state) {
 378                                 case 0:
 379                                 case 1:
 380                                         mp->state++;
 381                                         break;
 382                                 case 2:
 383                                 case 3:
 384                                         mp->size = (mp->size << 8) | (*p++ & 0xff);
 385                                         if (mp->size > MAXBUFL)
 386                                                 die("Message size too big from node (%d > %d)", mp->size, MAXBUFL);
 387                                         mp->state++;
 388                                         break;
 389                                 default:
 390                                         if (mp->inp - mp->data < mp->size) {
 391                                                 *mp->inp++ = *p++;
 392                                         }
 393                                         if (mp->inp - mp->data >= mp->size) {
 394                                                 /* kick it upstairs */
 395                                                 dbgdump(DMSG, "QUEUE MSG", mp->data, mp->inp - mp->data);
 396                                                 cmsg_send(f->inq, mp, 0);
 397                                                 mp = f->in = cmsg_new(MAXBUFL+1, f->sort, f);
 398                                         }
 399                                 }
 400                         }
 401                         break;
 402
 403                 default:
 404                         die("invalid sort (%d) in input handler", f->sort);
 405                 }
 406         }
 407
 408         /* output modes */
 409 lout:;
 410         if (out) {
 411                 int l, r;
 412
 413                 if (!f->out) {
 414                         mp = f->out = cmsg_next(f->outq);
 415                         if (!mp) {
 416                                 sp->flags &= ~SEL_OUTPUT;
 417                                 return 0;
 418                         }
 419                         mp->inp = mp->data;
 420                 }
 421                 l = mp->size - (mp->inp - mp->data);
 422                 if (l > 0) {
 423
 424                         dbgdump(DBUF, "<-out", mp->inp, l);
 425
 426                         r = write(f->cnum, mp->inp, l);
 427                         if (r < 0) {
 428                                 switch (errno) {
 429                                 case EINTR:
 430                                 case EINPROGRESS:
 431                                 case EAGAIN:
 432                                         goto lend;
 433                                 default:
 434                                         if (f->sort == MSG)
 435                                                 send_Z = 0;
 436                                         ending++;
 437                                         return;
 438                                 }
 439                         } else if (r > 0) {
 440                                 mp->inp += r;
 441                         }
 442                 } else if (l < 0)
 443                         die("got negative length in handler on node");
 444                 if (mp->inp - mp->data >= mp->size) {
 445                         cmsg_callback(mp, 0);
 446                         f->out = 0;
 447                 }
 448         }
 449 lend:;
 450         return 0;
 451 }
 452
 453 /*
 454  * things to do with initialisation
 455  */
 456
 457 void initargs(int argc, char *argv[])
 458 {
 459         int i, c, err = 0;
 460
 461         while ((c = getopt(argc, argv, "h:p:x:")) > 0) {
 462                 switch (c) {
 463                 case 'h':
 464                         node_addr = optarg;
 465                         break;
 466                 case 'l':
 467                         paclen = atoi(optarg);
 468                         if (paclen < 80)
 469                                 paclen = 80;
 470                         if (paclen > MAXPACLEN)
 471                                 paclen = MAXPACLEN;
 472                         break;
 473                 case 'p':
 474                         node_port = atoi(optarg);
 475                         break;
 476                 case 'x':
 477                         dbginit("client");
 478                         dbgset(atoi(optarg));
 479                         break;
 480                 default:
 481                         ++err;
 482                         goto lerr;
 483                 }
 484         }
 485
 486 lerr:
 487         if (err) {
 488                 die("usage: client [-x n|-h<host>|-p<port>|-l<paclen>] <call>|login [local|telnet|ax25]");
 489         }
 490
 491         if (optind < argc) {
 492                 call = strupper(argv[optind]);
 493                 ++optind;
 494         }
 495         if (!call)
 496                 die("Must have at least a callsign (for now)");
 497
 498         if (optind < argc) {
 499                 connsort = strlower(argv[optind]);
 500                 if (eq(connsort, "telnet") || eq(connsort, "local")) {
 501                         nl = '\n';
 502                         echo = 1;
 503                 } else if (eq(connsort, "ax25")) {
 504                         nl = '\r';
 505                         echo = 0;
 506                 } else {
 507                         die("2nd argument must be \"telnet\" or \"ax25\" or \"local\"");
 508                 }
 509         } else {
 510                 connsort = "local";
 511                 nl = '\n';
 512                 echo = 1;
 513         }
 514
 515         /* this is kludgy, but hey so is the rest of this! */
 516         if (!eq(connsort, "ax25") && paclen == DEFPACLEN) {
 517                 paclen = MAXPACLEN;
 518         }
 519 }
 520
 521 void connect_to_node()
 522 {
 523         struct hostent *hp, *gethostbyname();
 524         struct sockaddr_in server;
 525         int nodef;
 526         sel_t *sp;
 527
 528         if ((hp = gethostbyname(node_addr)) == 0)
 529                 die("Unknown host tcp host %s for printer", node_addr);
 530
 531         memset(&server, 0, sizeof server);
 532         server.sin_family = AF_INET;
 533         memcpy(&server.sin_addr, hp->h_addr, hp->h_length);
 534         server.sin_port = htons(node_port);
 535
 536         nodef = socket(AF_INET, SOCK_STREAM, 0);
 537         if (nodef < 0)
 538                 die("Can't open socket to %s port %d (%d)", node_addr, node_port, errno);
 539
 540         if (connect(nodef, (struct sockaddr *) &server, sizeof server) < 0) {
 541                 die("Error on connect to %s port %d (%d)", node_addr, node_port, errno);
 542         }
 543         node = fcb_new(nodef, MSG);
 544         node->sp = sel_open(nodef, node, "Msg System", fcb_handler, MSG, SEL_INPUT);
 545
 546 }
 547
 548 /*
 549  * things to do with going away
 550  */
 551
 552 void term_timeout(int i)
 553 {
 554         /* none of this is going to be reused so don't bother cleaning up properly */
 555         if (in && in->t_set)
 556                 tcsetattr(0, TCSANOW, &in->t);
 557         if (node) {
 558                 close(node->cnum);
 559         }
 560         exit(i);
 561 }
 562
 563 void terminate(int i)
 564 {
 565         if (node && send_Z && call) {
 566                 send_msg(node, 'Z', "", 0);
 567         }
 568
 569         signal(SIGALRM, term_timeout);
 570         alarm(10);
 571
 572         while ((in && !is_chain_empty(in->outq)) ||
 573                    (node && !is_chain_empty(node->outq))) {
 574                 sel_run();
 575         }
 576         if (in && in->t_set)
 577                 tcsetattr(0, TCSADRAIN, &in->t);
 578         if (node)
 579                 close(node->cnum);
 580         exit(i);
 581 }
 582
 583 void login_timeout(int i)
 584 {
 585         write(0, "Timed Out", 10);
 586         write(0, &nl, 1);
 587         sel_run();                                      /* force a coordination */
 588         if (in && in->t_set)
 589                 tcsetattr(0, TCSANOW, &in->t);
 590         exit(i);
 591 }
 592
 593 /*
 594  * things to do with ongoing processing of inputs
 595  */
 596
 597 void process_stdin()
 598 {
 599         cmsg_t *mp = cmsg_next(in->inq);
 600         if (mp) {
 601                 dbg(DMSG, "MSG size: %d", mp->size);
 602
 603                 if (mp->size > 0 && mp->inp > mp->data) {
 604                         send_msg(node, 'I', mp->data, mp->size);
 605                 }
 606                 cmsg_callback(mp, 0);
 607         }
 608 }
 609
 610 void process_node()
 611 {
 612         cmsg_t *mp = cmsg_next(node->inq);
 613         if (mp) {
 614                 dbg(DMSG, "MSG size: %d", mp->size);
 615
 616                 if (mp->size > 0 && mp->inp > mp->data) {
 617                         char *p = strchr(mp->data, '|');
 618                         if (p)
 619                                 p++;
 620                         switch (mp->data[0]) {
 621                         case 'Z':
 622                                 send_Z = 0;
 623                                 ending++;
 624                                 return;
 625                         case 'E':
 626                                 if (isdigit(*p))
 627                                         in->echo = *p - '0';
 628                                 break;
 629                         case 'B':
 630                                 if (isdigit(*p))
 631                                         in->buffer_it = *p - '0';
 632                                 break;
 633                         case 'D':
 634                                 if (p) {
 635                                         int l = mp->inp - (unsigned char *) p;
 636                                         send_text(in, p, l);
 637                                 }
 638                                 break;
 639                         default:
 640                                 break;
 641                         }
 642                 }
 643                 cmsg_callback(mp, 0);
 644         } else {
 645                 flush_text(in);
 646         }
 647 }
 648
 649 /*
 650  * the program itself....
 651  */
 652
 653 main(int argc, char *argv[])
 654 {
 655         /* set up environment */
 656         {
 657                 char *p = getenv("DXSPIDER_ROOT");
 658                 if (p)
 659                         root = p;
 660                 p = getenv("DXSPIDER_HOST");
 661                 if (p)
 662                         node_addr = p;
 663                 p = getenv("DXSPIDER_PORT");
 664                 if (p)
 665                         node_port = atoi(p);
 666                 p = getenv("DXSPIDER_PACLEN");
 667                 if (p) {
 668                         paclen = atoi(p);
 669                         if (paclen < 80)
 670                                 paclen = 80;
 671                         if (paclen > MAXPACLEN)
 672                                 paclen = MAXPACLEN;
 673                 }
 674         }
 675
 676         /* get program arguments, initialise stuff */
 677         initargs(argc, argv);
 678         sel_init(10, 0, 10000);
 679
 680         /* trap signals */
 681         signal(SIGHUP, SIG_IGN);
 682         signal(SIGINT, terminate);
 683         signal(SIGQUIT, terminate);
 684         signal(SIGTERM, terminate);
 685 #ifdef SIGPWR
 686         signal(SIGPWR, terminate);
 687 #endif
 688
 689         /* compile regexes for iscallsign */
 690         {
 691                 myregex_t *rp;
 692                 for (rp = iscallreg; rp->in; ++rp) {
 693                         regex_t reg;
 694                         int r = regcomp(&reg, rp->in, REG_EXTENDED|REG_ICASE|REG_NOSUB);
 695                         if (r)
 696                                 die("regcomp returned %d for '%s'", r, rp->in);
 697                         rp->regex = malloc(sizeof(regex_t));
 698                         if (!rp->regex)
 699                                 die("out of room - compiling regexes");
 700                         *rp->regex = reg;
 701                 }
 702         }
 703
 704         /* is this a login? */
 705         if (eq(call, "LOGIN")) {
 706                 char buf[MAXPACLEN+1];
 707                 int r;
 708                 int f = xopen("data", "issue", 0);
 709                 if (f > 0) {
 710                         while ((r = read(f, buf, paclen)) > 0) {
 711                                 if (nl != '\n') {
 712                                         char *p;
 713                                         for (p = buf; p < &buf[r]; ++p) {
 714                                                 if (*p == '\n')
 715                                                         *p = nl;
 716                                         }
 717                                 }
 718                                 write(0, buf, r);
 719                         }
 720                         close(f);
 721                 }
 722                 signal(SIGALRM, login_timeout);
 723                 alarm(timeout);
 724                 write(0, "login: ", 7);
 725                 r = read(0, buf, 20);
 726                 if (r <= 0)
 727                         die("No login or error (%d)", errno);
 728                 signal(SIGALRM, SIG_IGN);
 729                 alarm(0);
 730                 while (r > 0) {
 731                         if (buf[r-1] == ' ' || buf[r-1] == '\r' || buf[r-1] == '\n')
 732                                 --r;
 733                         else
 734                                 break;
 735                 }
 736                 buf[r] = 0;
 737                 call = strupper(buf);
 738         }
 739
 740         /* check the callsign */
 741         if (!iscallsign(call)) {
 742                 die("Sorry, %s isn't a valid callsign", call);
 743         }
 744
 745         /* connect up stdin */
 746         in = fcb_new(0, TEXT);
 747         in->sp = sel_open(0, in, "STDIN", fcb_handler, TEXT, SEL_INPUT);
 748         if (tcgetattr(0, &in->t) < 0) {
 749                 echo = 0;
 750                 in->t_set = 0;
 751         } else {
 752                 struct termios t = in->t;
 753                 t.c_lflag &= ~(ECHO|ECHONL|ICANON);
 754                 if (tcsetattr(0, TCSANOW, &t) < 0)
 755                         die("tcsetattr (%d)", errno);
 756                 in->echo = echo;
 757                 in->t_set = 1;
 758         }
 759         in->buffer_it = 1;
 760
 761         /* connect up node */
 762         connect_to_node();
 763
 764         /* tell the cluster who I am */
 765         send_msg(node, 'A', connsort, strlen(connsort));
 766
 767         /* main processing loop */
 768         while (!ending) {
 769                 sel_run();
 770                 if (!ending) {
 771                         process_stdin();
 772                         process_node();
 773                 }
 774         }
 775         terminate(0);
 776 }
 777
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