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 mode = 1;                  /* 0 - ax25, 1 - normal telnet, 2 - nlonly telnet */
  85 char ending = 0;                                /* set this to end the program */
  86 char send_Z = 1;                                /* set a Z record to the node on termination */
  87 char echo = 1;                                  /* echo characters on stdout from stdin */
  88 char int_tabs = 0;                              /* interpret tabs -> spaces */
  89 char *root = "/spider";         /* root of data tree, can be overridden by DXSPIDER_ROOT  */
  90 int timeout = 60;                               /* default timeout for logins and things */
  91 int paclen = DEFPACLEN;                 /* default buffer size for outgoing packets */
  92 int tabsize = 8;                                /* default tabsize for text messages */
  93
  94 myregex_t iscallreg[] = {               /* regexes to determine whether this is a reasonable callsign */
  95         {
  96                 "^[A-Z]+[0-9]+[A-Z]+[1-9]?$", 0                /* G1TLH G1TLH1 */
  97         },
  98         {
  99                 "^[0-9]+[A-Z]+[0-9]+[A-Z]+[1-9]?$", 0          /* 2E0AAA 2E0AAA1 */
 100         },
 101         {
 102                 "^[A-Z]+[0-9]+[A-Z]+-[1-9]$", 0                /* G1TLH-2 */
 103         },
 104         {
 105                 "^[0-9]+[A-Z]+[0-9]+[A-Z]+-[1-9]$", 0          /* 2E0AAA-2 */
 106         },
 107         {
 108                 "^[A-Z]+[0-9]+[A-Z]+-1[0-5]$", 0               /* G1TLH-11 */
 109         },
 110         {
 111                 "^[0-9]+[A-Z]+[0-9]+[A-Z]+-1[0-5]$", 0         /* 2E0AAA-11 */
 112         },
 113         {
 114                 0, 0
 115         }
 116 };
 117
 118 void terminate(int);
 119
 120 /*
 121  * utility routines - various
 122  */
 123
 124 void die(char *s, ...)
 125 {
 126         char buf[2000];
 127
 128         va_list ap;
 129         va_start(ap, s);
 130         vsnprintf(buf, sizeof(buf)-1, s, ap);
 131         va_end(ap);
 132         fprintf(stderr,"%s\n", buf);
 133         terminate(-1);
 134 }
 135
 136 char *strupper(char *s)
 137 {
 138         char *d = malloc(strlen(s)+1);
 139         char *p = d;
 140
 141         if (!d)
 142                 die("out of room in strupper");
 143         while (*p++ = toupper(*s++)) ;
 144         return d;
 145 }
 146
 147 char *strlower(char *s)
 148 {
 149         char *d = malloc(strlen(s)+1);
 150         char *p = d;
 151
 152         if (!d)
 153                 die("out of room in strlower");
 154         while (*p++ = tolower(*s++)) ;
 155         return d;
 156 }
 157
 158 int eq(char *a, char *b)
 159 {
 160         return (strcmp(a, b) == 0);
 161 }
 162
 163 int xopen(char *dir, char *name, int mode)
 164 {
 165         char fn[MAXPATHLEN+1];
 166         snprintf(fn, MAXPATHLEN, "%s/%s/%s", root, dir, name);
 167         return open(fn, mode);
 168 }
 169
 170 int iscallsign(char *s)
 171 {
 172         myregex_t *rp;
 173
 174         if (strlen(s) > MAXCALLSIGN)
 175                 return 0;
 176
 177         for (rp = iscallreg; rp->in; ++rp) {
 178                 if (regexec(rp->regex, s, 0, 0, 0) == 0)
 179                         return 1;
 180         }
 181         return 0;
 182 }
 183
 184 /*
 185  * higher level send and receive routines
 186  */
 187
 188 fcb_t *fcb_new(int cnum, int sort)
 189 {
 190         fcb_t *f = malloc(sizeof(fcb_t));
 191         if (!f)
 192                 die("no room in fcb_new");
 193         memset (f, 0, sizeof(fcb_t));
 194         f->cnum = cnum;
 195         f->sort = sort;
 196         f->inq = chain_new();
 197         f->outq = chain_new();
 198         return f;
 199 }
 200
 201 void flush_text(fcb_t *f)
 202 {
 203         if (f->obuf) {
 204                 cmsg_send(f->outq, f->obuf, 0);
 205                 f->sp->flags |= SEL_OUTPUT;
 206                 f->obuf = 0;
 207         }
 208 }
 209
 210 void send_text(fcb_t *f, char *s, int l)
 211 {
 212         cmsg_t *mp;
 213         char *p;
 214
 215         if (f->buffer_it && f->obuf) {
 216                 mp = f->obuf;
 217         } else {
 218                 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
 219         }
 220
 221         /* remove trailing spaces  */
 222         while (l > 0 &&isspace(s[l-1]))
 223                 --l;
 224
 225         for (p = s; p < s+l; ) {
 226                 if (mp->inp >= mp->data + paclen) {
 227                         flush_text(f);
 228                         f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
 229                 }
 230                 *mp->inp++ = *p++;
 231         }
 232         if (mp->inp >= mp->data + paclen) {
 233                 flush_text(f);
 234                 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
 235         }
 236         if (nl == '\r')
 237                 *mp->inp++ = nl;
 238         else {
 239                 if (mode != 2)
 240                         *mp->inp++ = '\r';
 241                 *mp->inp++ = '\n';
 242         }
 243         if (!f->buffer_it)
 244                 flush_text(f);
 245 }
 246
 247 void send_msg(fcb_t *f, char let, unsigned char *s, int l)
 248 {
 249         cmsg_t *mp;
 250         int ln;
 251         int myl = strlen(call)+2+l;
 252
 253         mp = cmsg_new(myl+4+1, f->sort, f);
 254         *mp->inp++ = let;
 255         strcpy(mp->inp, call);
 256         mp->inp += strlen(call);
 257         *mp->inp++ = '|';
 258         if (l > 0) {
 259                 unsigned char *p;
 260                 for (p = s; p < s+l; ++p) {
 261                         if (mp->inp >= mp->data + (myl - 4)) {
 262                                 int off = mp->inp - mp->data;
 263                                 myl += 256;
 264                                 mp = realloc(mp, myl);
 265                                 mp->inp = mp->data + off;
 266                         }
 267
 268                         if (*p < 0x20 || *p > 0x7e || *p == '%') {
 269                                 sprintf(mp->inp, "%%%02X", *p & 0xff);
 270                                 mp->inp += strlen(mp->inp);
 271                         } else
 272                                 *mp->inp++ = *p;
 273                 }
 274         }
 275         *mp->inp++ = '\n';
 276         *mp->inp = 0;
 277         cmsg_send(f->outq, mp, 0);
 278         f->sp->flags |= SEL_OUTPUT;
 279 }
 280
 281 /*
 282  * the callback (called by sel_run) that handles all the inputs and outputs
 283  */
 284
 285 int fcb_handler(sel_t *sp, int in, int out, int err)
 286 {
 287         fcb_t *f = sp->fcb;
 288         cmsg_t *mp, *omp;
 289         unsigned char c;
 290
 291         /* input modes */
 292         if (in) {
 293                 char *p, buf[MAXBUFL];
 294                 int r;
 295
 296                 /* read what we have into a buffer */
 297                 r = read(f->cnum, buf, MAXBUFL);
 298                 if (r < 0) {
 299                         switch (errno) {
 300                         case EINTR:
 301                         case EINPROGRESS:
 302                         case EAGAIN:
 303                                 goto lout;
 304                         default:
 305 /*                              if (f->sort == MSG)
 306                                 send_Z = 0; */
 307                                 dbg(DBUF,"got errno %d in input", errno);
 308                                 ending++;
 309                                 return 0;
 310                         }
 311                 } else if (r == 0) {
 312 /*                      if (f->sort == MSG)
 313                         send_Z = 0; */
 314                         dbg(DBUF, "ending normally");
 315                         ending++;
 316                         return 0;
 317                 }
 318
 319                 dbgdump(DBUF, "in ->", buf, r);
 320
 321                 /* create a new message buffer if required */
 322                 if (!f->in)
 323                         f->in = cmsg_new(MAXBUFL+1, f->sort, f);
 324                 mp = f->in;
 325
 326                 switch (f->sort) {
 327                 case TEXT:
 328                         p = buf;
 329                         if (f->echo)
 330                                 omp = cmsg_new(3*r+1, f->sort, f);
 331                         while (r > 0 && p < &buf[r]) {
 332
 333                                 /* echo processing */
 334                                 if (f->echo) {
 335                                         switch (*p) {
 336                                         case '\b':
 337                                         case 0x7f:
 338                                                 strcpy(omp->inp, "\b \b");
 339                                                 omp->inp += strlen(omp->inp);
 340                                                 break;
 341                                         default:
 342                                                 *omp->inp++ = *p;
 343                                         }
 344                                 }
 345
 346                                 /* character processing */
 347                                 switch (*p) {
 348                                 case '\t':
 349                                         if (int_tabs) {
 350                                                 memset(mp->inp, ' ', tabsize);
 351                                                 mp->inp += tabsize;
 352                                                 ++p;
 353                                         } else {
 354                                                 *mp->inp++ = *p++;
 355                                         }
 356                                         break;
 357                                 case 0x08:
 358                                 case 0x7f:
 359                                         if (mp->inp > mp->data)
 360                                                 mp->inp--;
 361                                         ++p;
 362                                         break;
 363                                 default:
 364                                         if (nl == '\n' && *p == '\r') {   /* ignore \r in telnet mode (ugh) */
 365                                                 p++;
 366                                         } else if (*p == nl) {
 367                                                 if (mp->inp == mp->data)
 368                                                         *mp->inp++ = ' ';
 369                                                 *mp->inp = 0;              /* zero terminate it, but don't include it in the length */
 370                                                 dbgdump(DMSG, "QUEUE TEXT", mp->data, mp->inp-mp->data);
 371                                                 cmsg_send(f->inq, mp, 0);
 372                                                 f->in = mp = cmsg_new(MAXBUFL+1, f->sort, f);
 373                                                 ++p;
 374                                         } else {
 375                                                 if (mp->inp < &mp->data[MAXBUFL-8])
 376                                                         *mp->inp++ = *p++;
 377                                                 else {
 378                                                         mp->inp = mp->data;
 379                                                 }
 380                                         }
 381                                 }
 382                         }
 383
 384                         /* queue any echo text */
 385                         if (f->echo) {
 386                                 dbgdump(DMSG, "QUEUE ECHO TEXT", omp->data, omp->inp - omp->data);
 387                                 cmsg_send(f->outq, omp, 0);
 388                                 f->sp->flags |= SEL_OUTPUT;
 389                         }
 390
 391                         break;
 392
 393                 case MSG:
 394                         p = buf;
 395                         while (r > 0 && p < &buf[r]) {
 396                                 unsigned char ch = *p++;
 397
 398                                 if (mp->inp >= mp->data + (MAXBUFL-1)) {
 399                                         mp->state = 0;
 400                                         mp->inp = mp->data;
 401                                         dbg(DMSG, "Message longer than %d received", MAXBUFL);
 402                                 }
 403
 404                                 switch (mp->state) {
 405                                 case 0:
 406                                         if (ch == '%') {
 407                                                 c = 0;
 408                                                 mp->state = 1;
 409                                         } else if (ch == '\n') {
 410                                                 /* kick it upstairs */
 411                                                 *mp->inp = 0;
 412                                                 dbgdump(DMSG, "QUEUE MSG", mp->data, mp->inp - mp->data);
 413                                                 cmsg_send(f->inq, mp, 0);
 414                                                 mp = f->in = cmsg_new(MAXBUFL+1, f->sort, f);
 415                                         } else if (ch < 0x20 || ch > 0x7e) {
 416                                                 dbg(DMSG, "Illegal character (0x%02X) received", *p);
 417                                                 mp->inp = mp->data;
 418                                         } else {
 419                                                 *mp->inp++ = ch;
 420                                         }
 421                                         break;
 422
 423                                 case 1:
 424                                         mp->state = 2;
 425                                         if (ch >= '0' && ch <= '9')
 426                                                 c = (ch - '0') << 4;
 427                                         else if (ch >= 'A' && ch <= 'F')
 428                                                 c = (ch - 'A' + 10) << 4;
 429                                         else if (ch >= 'a' && ch <= 'a')
 430                                                 c = (ch - 'a' + 10) << 4;
 431                                         else {
 432                                                 dbg(DMSG, "Illegal hex char (%c) received in state %d", ch, mp->state);
 433                                                 mp->inp = mp->data;
 434                                                 mp->state = 0;
 435                                         }
 436                                         break;
 437
 438                                 case 2:
 439                                         if (ch >= '0' && ch <= '9')
 440                                                 *mp->inp++ = c | (ch - '0');
 441                                         else if (ch >= 'A' && ch <= 'F')
 442                                                 *mp->inp++ = c | (ch - 'A' + 10);
 443                                         else if (ch >= 'a' && ch <= 'a')
 444                                                 *mp->inp++ = c | (ch - 'a' + 10);
 445                                         else {
 446                                                 dbg(DMSG, "Illegal hex char (%c) received in state %d", ch, mp->state);
 447                                                 mp->inp = mp->data;
 448                                         }
 449                                         mp->state = 0;
 450                                 }
 451                         }
 452                         break;
 453
 454                 default:
 455                         die("invalid sort (%d) in input handler", f->sort);
 456                 }
 457         }
 458
 459         /* output modes */
 460 lout:;
 461         if (out) {
 462                 int l, r;
 463
 464                 if (!f->out) {
 465                         mp = f->out = cmsg_next(f->outq);
 466                         if (!mp) {
 467                                 sp->flags &= ~SEL_OUTPUT;
 468                                 return 0;
 469                         }
 470                         mp->inp = mp->data;
 471                 }
 472                 l = mp->size - (mp->inp - mp->data);
 473                 if (l > 0) {
 474
 475                         dbgdump(DBUF, "<-out", mp->inp, l);
 476
 477                         r = write(f->cnum, mp->inp, l);
 478                         if (r < 0) {
 479                                 switch (errno) {
 480                                 case EINTR:
 481                                 case EINPROGRESS:
 482                                 case EAGAIN:
 483                                         goto lend;
 484                                 default:
 485 /*                                      if (f->sort == MSG)
 486                                         send_Z = 0; */
 487                                         dbg(DBUF,"got errno %d in output", errno);
 488                                         ending++;
 489                                         return;
 490                                 }
 491                         } else if (r > 0) {
 492                                 mp->inp += r;
 493                         }
 494                 } else if (l < 0)
 495                         die("got negative length in handler on node");
 496                 if (mp->inp - mp->data >= mp->size) {
 497                         cmsg_callback(mp, 0);
 498                         f->out = 0;
 499                 }
 500         }
 501 lend:;
 502         return 0;
 503 }
 504
 505 /*
 506  * set up the various mode flags, NL endings and things
 507  */
 508 void setmode(char *m)
 509 {
 510         char *connsort = strlower(m);
 511         if (eq(connsort, "telnet") || eq(connsort, "local") || eq(connsort, "nlonly") {
 512                 nl = '\n';
 513                 echo = 1;
 514                 mode = eq(connsort, "nlonly") 2 : 1;
 515         } else if (eq(connsort, "ax25")) {
 516                 nl = '\r';
 517                 echo = 0;
 518                 mode = 0;
 519         } else if (eq(connsort, "connect")) {
 520                 nl = '\n';
 521                 echo = 0;
 522                 mode = 3;
 523         } else {
 524                 die("Connection type must be \"telnet\", \"nlonly\", \"ax25\", \"login\" or \"local\"");
 525         }
 526 }
 527
 528 /*
 529  * things to do with initialisation
 530  */
 531
 532 void initargs(int argc, char *argv[])
 533 {
 534         int i, c, err = 0;
 535
 536         while ((c = getopt(argc, argv, "h:p:x:")) > 0) {
 537                 switch (c) {
 538                 case 'h':
 539                         node_addr = optarg;
 540                         break;
 541                 case 'l':
 542                         paclen = atoi(optarg);
 543                         if (paclen < 80)
 544                                 paclen = 80;
 545                         if (paclen > MAXPACLEN)
 546                                 paclen = MAXPACLEN;
 547                         break;
 548                 case 'p':
 549                         node_port = atoi(optarg);
 550                         break;
 551                 case 'x':
 552                         dbginit("client");
 553                         dbgset(atoi(optarg));
 554                         break;
 555                 default:
 556                         ++err;
 557                         goto lerr;
 558                 }
 559         }
 560
 561 lerr:
 562         if (err) {
 563                 die("usage: client [-x n|-h<host>|-p<port>|-l<paclen>] <call>|login [local|telnet|ax25]");
 564         }
 565
 566         if (optind < argc) {
 567                 call = strupper(argv[optind]);
 568                 ++optind;
 569         }
 570         if (!call)
 571                 die("Must have at least a callsign (for now)");
 572
 573         if (optind < argc) {
 574                 setmode(argv[optind]);
 575         } else {
 576                 setmode("local");
 577         }
 578
 579         /* this is kludgy, but hey so is the rest of this! */
 580         if (!eq(connsort, "ax25") && paclen == DEFPACLEN) {
 581                 paclen = MAXPACLEN;
 582         }
 583 }
 584
 585 void connect_to_node()
 586 {
 587         struct hostent *hp, *gethostbyname();
 588         struct sockaddr_in server;
 589         int nodef;
 590         sel_t *sp;
 591
 592         if ((hp = gethostbyname(node_addr)) == 0)
 593                 die("Unknown host tcp host %s for printer", node_addr);
 594
 595         memset(&server, 0, sizeof server);
 596         server.sin_family = AF_INET;
 597         memcpy(&server.sin_addr, hp->h_addr, hp->h_length);
 598         server.sin_port = htons(node_port);
 599
 600         nodef = socket(AF_INET, SOCK_STREAM, 0);
 601         if (nodef < 0)
 602                 die("Can't open socket to %s port %d (%d)", node_addr, node_port, errno);
 603
 604         if (connect(nodef, (struct sockaddr *) &server, sizeof server) < 0) {
 605                 die("Error on connect to %s port %d (%d)", node_addr, node_port, errno);
 606         }
 607         node = fcb_new(nodef, MSG);
 608         node->sp = sel_open(nodef, node, "Msg System", fcb_handler, MSG, SEL_INPUT);
 609
 610 }
 611
 612 /*
 613  * things to do with going away
 614  */
 615
 616 void term_timeout(int i)
 617 {
 618         /* none of this is going to be reused so don't bother cleaning up properly */
 619         if (in && in->t_set)
 620                 tcsetattr(0, TCSANOW, &in->t);
 621         if (node) {
 622                 shutdown(node->cnum, 3);
 623                 close(node->cnum);
 624         }
 625         exit(i);
 626 }
 627
 628 void terminate(int i)
 629 {
 630         if (node && send_Z && call) {
 631                 send_msg(node, 'Z', "bye", 3);
 632         }
 633
 634         signal(SIGALRM, term_timeout);
 635         alarm(10);
 636
 637         while ((in && !is_chain_empty(in->outq)) ||
 638                    (node && !is_chain_empty(node->outq))) {
 639                 sel_run();
 640         }
 641         if (in && in->t_set)
 642                 tcsetattr(0, TCSADRAIN, &in->t);
 643         if (node) {
 644                 shutdown(node->cnum, 3);
 645                 close(node->cnum);
 646         }
 647         exit(i);
 648 }
 649
 650 void login_timeout(int i)
 651 {
 652         write(0, "Timed Out", 10);
 653         write(0, &nl, 1);
 654         sel_run();                                      /* force a coordination */
 655         if (in && in->t_set)
 656                 tcsetattr(0, TCSANOW, &in->t);
 657         exit(i);
 658 }
 659
 660 /*
 661  * things to do with ongoing processing of inputs
 662  */
 663
 664 void process_stdin()
 665 {
 666         cmsg_t *mp = cmsg_next(in->inq);
 667         if (mp) {
 668                 dbg(DMSG, "MSG size: %d", mp->size);
 669
 670                 if (mp->size > 0 && mp->inp > mp->data) {
 671                         send_msg(node, 'I', mp->data, mp->size);
 672                 }
 673                 cmsg_callback(mp, 0);
 674         }
 675 }
 676
 677 void process_node()
 678 {
 679         cmsg_t *mp = cmsg_next(node->inq);
 680         if (mp) {
 681                 dbg(DMSG, "MSG size: %d", mp->size);
 682
 683                 if (mp->size > 0 && mp->inp > mp->data) {
 684                         char *p = strchr(mp->data, '|');
 685                         if (p)
 686                                 p++;
 687                         switch (mp->data[0]) {
 688                         case 'Z':
 689                                 send_Z = 0;
 690                                 ending++;
 691                                 return;
 692                         case 'E':
 693                                 if (isdigit(*p))
 694                                         in->echo = *p - '0';
 695                                 break;
 696                         case 'B':
 697                                 if (isdigit(*p))
 698                                         in->buffer_it = *p - '0';
 699                                 break;
 700                         case 'D':
 701                                 if (p) {
 702                                         int l = mp->inp - (unsigned char *) p;
 703                                         send_text(in, p, l);
 704                                 }
 705                                 break;
 706                         default:
 707                                 break;
 708                         }
 709                 }
 710                 cmsg_callback(mp, 0);
 711         } else {
 712                 flush_text(in);
 713         }
 714 }
 715
 716 /*
 717  * the program itself....
 718  */
 719
 720 main(int argc, char *argv[])
 721 {
 722         /* set up environment */
 723         {
 724                 char *p = getenv("DXSPIDER_ROOT");
 725                 if (p)
 726                         root = p;
 727                 p = getenv("DXSPIDER_HOST");
 728                 if (p)
 729                         node_addr = p;
 730                 p = getenv("DXSPIDER_PORT");
 731                 if (p)
 732                         node_port = atoi(p);
 733                 p = getenv("DXSPIDER_PACLEN");
 734                 if (p) {
 735                         paclen = atoi(p);
 736                         if (paclen < 80)
 737                                 paclen = 80;
 738                         if (paclen > MAXPACLEN)
 739                                 paclen = MAXPACLEN;
 740                 }
 741         }
 742
 743         /* get program arguments, initialise stuff */
 744         initargs(argc, argv);
 745         sel_init(10, 0, 10000);
 746
 747         /* trap signals */
 748         signal(SIGHUP, SIG_IGN);
 749         signal(SIGINT, terminate);
 750         signal(SIGQUIT, terminate);
 751         signal(SIGTERM, terminate);
 752 #ifdef SIGPWR
 753         signal(SIGPWR, terminate);
 754 #endif
 755
 756         /* compile regexes for iscallsign */
 757         {
 758                 myregex_t *rp;
 759                 for (rp = iscallreg; rp->in; ++rp) {
 760                         regex_t reg;
 761                         int r = regcomp(&reg, rp->in, REG_EXTENDED|REG_ICASE|REG_NOSUB);
 762                         if (r)
 763                                 die("regcomp returned %d for '%s'", r, rp->in);
 764                         rp->regex = malloc(sizeof(regex_t));
 765                         if (!rp->regex)
 766                                 die("out of room - compiling regexes");
 767                         *rp->regex = reg;
 768                 }
 769         }
 770
 771         /* is this a login? */
 772         if (eq(call, "LOGIN") || eq(call, "login")) {
 773                 chgstate(LOGIN);
 774         } else if (eq(
 775
 776                 char buf[MAXPACLEN+1];
 777                 char callsign[MAXCALLSIGN+1];
 778                 int r, i;
 779                 int f = xopen("data", "issue", 0);
 780                 if (f > 0) {
 781                         while ((r = read(f, buf, paclen)) > 0) {
 782                                 if (nl != '\n') {
 783                                         char *p;
 784                                         for (p = buf; p < &buf[r]; ++p) {
 785                                                 if (*p == '\n')
 786                                                         *p = nl;
 787                                         }
 788                                 }
 789                                 write(0, buf, r);
 790                         }
 791                         close(f);
 792                 }
 793                 signal(SIGALRM, login_timeout);
 794                 alarm(timeout);
 795                 write(0, "login: ", 7);
 796                 dbgdump(DBUF, "<-out", "login: ", 7);
 797                 for (i = 0;;) {
 798                         char *p;
 799                     r = read(0, buf, 20);
 800                         dbgdump(DBUF, "in ->", buf, r);
 801                         if (r <= 0)
 802                                 die("No login or error (%d)", errno);
 803                         write(0, buf, r);
 804                         dbgdump(DBUF, "<-out", buf, r);
 805                         for (p = buf; p < buf+r; ++p) {
 806                                 if (i < MAXCALLSIGN) {
 807                                         if (*p == '\r' || *p == '\n')
 808                                                 goto lgotcall;
 809                                         else if (isalnum(*p) || *p == '-')
 810                                                 callsign[i++] = *p;
 811                                         else
 812                                                 die("%c is not a valid callsign character", *p);
 813                                 } else
 814                                         die("callsign entered is too long");
 815                         }
 816                 }
 817 lgotcall:
 818                 signal(SIGALRM, SIG_IGN);
 819                 alarm(0);
 820                 callsign[i]= 0;
 821                 call = strupper(callsign);
 822         }
 823
 824         /* check the callsign */
 825         if (!iscallsign(call)) {
 826                 die("Sorry, %s isn't a valid callsign", call);
 827         }
 828
 829         /* connect up stdin */
 830         in = fcb_new(0, TEXT);
 831         in->sp = sel_open(0, in, "STDIN", fcb_handler, TEXT, SEL_INPUT);
 832         if (tcgetattr(0, &in->t) < 0) {
 833 /*              echo = 0; */
 834                 in->echo = echo;
 835                 in->t_set = 0;
 836         } else {
 837                 struct termios t = in->t;
 838                 t.c_lflag &= ~(ECHO|ECHONL|ICANON);
 839                 if (tcsetattr(0, TCSANOW, &t) < 0)
 840                         die("tcsetattr (%d)", errno);
 841                 in->echo = echo;
 842                 in->t_set = 1;
 843         }
 844         in->buffer_it = 1;
 845
 846         /* connect up node */
 847         connect_to_node();
 848
 849         /* tell the cluster who I am */
 850         send_msg(node, 'A', connsort, strlen(connsort));
 851
 852         /* main processing loop */
 853         while (!ending) {
 854                 sel_run();
 855                 if (!ending) {
 856                         process_stdin();
 857                         process_node();
 858                 }
 859         }
 860         terminate(0);
 861 }
 862
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