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