2 * C Client for the DX Spider cluster program
4 * Eventually this program will be a complete replacement
5 * for the perl version.
7 * This program provides the glue necessary to talk between
8 * an input (eg from telnet or ax25) and the perl DXSpider
11 * Currently, this program connects STDIN/STDOUT to the
12 * message system used by cluster.pl
14 * Copyright (c) 2000 Dirk Koopman G1TLH
21 #include <sys/types.h>
27 #include <sys/socket.h>
28 #include <netinet/in.h>
43 #define MAXPATHLEN 256
52 int cnum; /* the connection number */
53 int sort; /* the type of connection either text or msg */
54 cmsg_t *in; /* current input message being built up */
55 cmsg_t *out; /* current output message being sent */
56 cmsg_t *obuf; /* current output being buffered */
57 reft *inq; /* input queue */
58 reft *outq; /* output queue */
59 sel_t *sp; /* my select fcb address */
60 struct termios t; /* any termios associated with this cnum */
61 char echo; /* echo characters back to this cnum */
62 char t_set; /* the termios structure is valid */
63 char buffer_it; /* buffer outgoing packets for paclen */
66 char *node_addr = "localhost"; /* the node tcp address, can be overridden by DXSPIDER_HOST */
67 int node_port = 27754; /* the tcp port of the node at the above address can be overidden by DXSPIDER_PORT*/
68 char *call; /* the caller's callsign */
69 char *connsort; /* the type of connection */
70 fcb_t *in; /* the fcb of 'stdin' that I shall use */
71 fcb_t *node; /* the fcb of the msg system */
72 char nl = '\n'; /* line end character */
73 char ending = 0; /* set this to end the program */
74 char send_Z = 1; /* set a Z record to the node on termination */
75 char echo = 1; /* echo characters on stdout from stdin */
76 char int_tabs = 0; /* interpret tabs -> spaces */
77 char *root = "/spider"; /* root of data tree, can be overridden by DXSPIDER_ROOT */
78 int timeout = 60; /* default timeout for logins and things */
79 int paclen = 128; /* default buffer size for outgoing packets */
80 int tabsize = 8; /* default tabsize for text messages */
85 * utility routines - various
88 void die(char *s, ...)
94 vsnprintf(buf, sizeof(buf)-1, s, ap);
96 fprintf(stderr,"%s\n", buf);
100 char *strupper(char *s)
102 char *d = malloc(strlen(s)+1);
106 die("out of room in strupper");
107 while (*p++ = toupper(*s++)) ;
111 char *strlower(char *s)
113 char *d = malloc(strlen(s)+1);
117 die("out of room in strlower");
118 while (*p++ = tolower(*s++)) ;
122 int eq(char *a, char *b)
124 return (strcmp(a, b) == 0);
127 int xopen(char *dir, char *name, int mode)
129 char fn[MAXPATHLEN+1];
130 snprintf(fn, MAXPATHLEN, "%s/%s/%s", root, dir, name);
131 return open(fn, mode);
134 int iscallsign(char *s)
136 char *p, ch, state = 0;
141 case 0: /* initial numerics */
152 case 1: /* letter(s) */
153 case 10: /* had an initial character */
166 * higher level send and receive routines
169 fcb_t *fcb_new(int cnum, int sort)
171 fcb_t *f = malloc(sizeof(fcb_t));
173 die("no room in fcb_new");
174 memset (f, 0, sizeof(fcb_t));
177 f->inq = chain_new();
178 f->outq = chain_new();
182 void flush_text(fcb_t *f)
185 cmsg_send(f->outq, f->obuf, 0);
186 f->sp->flags |= SEL_OUTPUT;
191 void send_text(fcb_t *f, char *s, int l)
196 if (f->buffer_it && f->obuf) {
199 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
202 for (p = s; p < s+l; ) {
203 if (mp->inp >= mp->data + paclen) {
205 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
209 if (mp->inp >= mp->data + paclen) {
211 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
218 void send_msg(fcb_t *f, char let, char *s, int l)
222 int myl = strlen(call)+2+l;
224 mp = cmsg_new(myl+4+1, f->sort, f);
226 memcpy(mp->inp, &ln, 4);
229 strcpy(mp->inp, call);
230 mp->inp += strlen(call);
233 memcpy(mp->inp, s, l);
237 cmsg_send(f->outq, mp, 0);
238 f->sp->flags |= SEL_OUTPUT;
242 * the callback (called by sel_run) that handles all the inputs and outputs
245 int fcb_handler(sel_t *sp, int in, int out, int err)
252 char *p, buf[MAXBUFL];
255 /* read what we have into a buffer */
256 r = read(f->cnum, buf, MAXBUFL);
276 dbgdump(DBUF, "in ->", buf, r);
278 /* create a new message buffer if required */
280 f->in = cmsg_new(MAXBUFL+1, f->sort, f);
287 omp = cmsg_new(3*r+1, f->sort, f);
288 while (r > 0 && p < &buf[r]) {
290 /* echo processing */
295 strcpy(omp->inp, "\b \b");
296 omp->inp += strlen(omp->inp);
303 /* character processing */
307 memset(mp->inp, ' ', tabsize);
316 if (mp->inp > mp->data)
321 if (nl == '\n' && *p == '\r') { /* ignore \r in telnet mode (ugh) */
323 } else if (*p == nl) {
324 if (mp->inp == mp->data)
326 *mp->inp = 0; /* zero terminate it, but don't include it in the length */
327 dbgdump(DMSG, "QUEUE TEXT", mp->data, mp->inp-mp->data);
328 cmsg_send(f->inq, mp, 0);
329 f->in = mp = cmsg_new(MAXBUFL+1, f->sort, f);
332 if (mp->inp < &mp->data[MAXBUFL-8])
341 /* queue any echo text */
343 dbgdump(DMSG, "QUEUE ECHO TEXT", omp->data, omp->inp - omp->data);
344 cmsg_send(f->outq, omp, 0);
345 f->sp->flags |= SEL_OUTPUT;
352 while (r > 0 && p < &buf[r]) {
354 /* build up the size into the likely message length (yes I know it's a short) */
362 mp->size = (mp->size << 8) | (*p++ & 0xff);
363 if (mp->size > MAXBUFL)
364 die("Message size too big from node (%d > %d)", mp->size, MAXBUFL);
368 if (mp->inp - mp->data < mp->size) {
371 if (mp->inp - mp->data >= mp->size) {
372 /* kick it upstairs */
373 dbgdump(DMSG, "QUEUE MSG", mp->data, mp->inp - mp->data);
374 cmsg_send(f->inq, mp, 0);
375 mp = f->in = cmsg_new(MAXBUFL+1, f->sort, f);
382 die("invalid sort (%d) in input handler", f->sort);
392 mp = f->out = cmsg_next(f->outq);
394 sp->flags &= ~SEL_OUTPUT;
399 l = mp->size - (mp->inp - mp->data);
402 dbgdump(DBUF, "<-out", mp->inp, l);
404 r = write(f->cnum, mp->inp, l);
421 die("got negative length in handler on node");
422 if (mp->inp - mp->data >= mp->size) {
423 cmsg_callback(mp, 0);
432 * things to do with initialisation
435 void initargs(int argc, char *argv[])
439 while ((c = getopt(argc, argv, "h:p:x:")) > 0) {
445 paclen = atoi(optarg);
448 if (paclen > MAXPACLEN)
452 node_port = atoi(optarg);
456 dbgset(atoi(optarg));
466 die("usage: client [-x n|-h<host>|-p<port>|-l<paclen>] <call>|login [local|telnet|ax25]");
470 call = strupper(argv[optind]);
474 die("Must have at least a callsign (for now)");
477 connsort = strlower(argv[optind]);
478 if (eq(connsort, "telnet") || eq(connsort, "local")) {
481 } else if (eq(connsort, "ax25")) {
485 die("2nd argument must be \"telnet\" or \"ax25\" or \"local\"");
494 void connect_to_node()
496 struct hostent *hp, *gethostbyname();
497 struct sockaddr_in server;
501 if ((hp = gethostbyname(node_addr)) == 0)
502 die("Unknown host tcp host %s for printer", node_addr);
504 memset(&server, 0, sizeof server);
505 server.sin_family = AF_INET;
506 memcpy(&server.sin_addr, hp->h_addr, hp->h_length);
507 server.sin_port = htons(node_port);
509 nodef = socket(AF_INET, SOCK_STREAM, 0);
511 die("Can't open socket to %s port %d (%d)", node_addr, node_port, errno);
513 if (connect(nodef, (struct sockaddr *) &server, sizeof server) < 0) {
514 die("Error on connect to %s port %d (%d)", node_addr, node_port, errno);
516 node = fcb_new(nodef, MSG);
517 node->sp = sel_open(nodef, node, "Msg System", fcb_handler, MSG, SEL_INPUT);
522 * things to do with going away
525 void term_timeout(int i)
527 /* none of this is going to be reused so don't bother cleaning up properly */
529 tcsetattr(0, TCSANOW, &in->t);
536 void terminate(int i)
538 if (send_Z && call) {
539 send_msg(node, 'Z', "", 0);
542 signal(SIGALRM, term_timeout);
545 while ((in && !is_chain_empty(in->outq)) ||
546 (node && !is_chain_empty(node->outq))) {
550 tcsetattr(0, TCSADRAIN, &in->t);
556 void login_timeout(int i)
558 write(0, "Timed Out", 10);
560 sel_run(); /* force a coordination */
562 tcsetattr(0, TCSANOW, &in->t);
567 * things to do with ongoing processing of inputs
572 cmsg_t *mp = cmsg_next(in->inq);
574 dbg(DMSG, "MSG size: %d", mp->size);
576 if (mp->size > 0 && mp->inp > mp->data) {
577 send_msg(node, 'I', mp->data, mp->size);
579 cmsg_callback(mp, 0);
585 cmsg_t *mp = cmsg_next(node->inq);
587 dbg(DMSG, "MSG size: %d", mp->size);
589 if (mp->size > 0 && mp->inp > mp->data) {
590 char *p = strchr(mp->data, '|');
593 switch (mp->data[0]) {
604 in->buffer_it = *p - '0';
608 int l = mp->inp - (unsigned char *) p;
616 cmsg_callback(mp, 0);
623 * the program itself....
626 main(int argc, char *argv[])
628 /* set up environment */
630 char *p = getenv("DXSPIDER_ROOT");
633 p = getenv("DXSPIDER_HOST");
636 p = getenv("DXSPIDER_PORT");
639 p = getenv("DXSPIDER_PACLEN");
644 if (paclen > MAXPACLEN)
649 /* get program arguments, initialise stuff */
650 initargs(argc, argv);
651 sel_init(10, 0, 10000);
654 signal(SIGHUP, SIG_IGN);
655 signal(SIGINT, terminate);
656 signal(SIGQUIT, terminate);
657 signal(SIGTERM, terminate);
659 signal(SIGPWR, terminate);
662 /* is this a login? */
663 if (eq(call, "LOGIN")) {
664 char buf[MAXPACLEN+1];
666 int f = xopen("data", "issue", 0);
668 while ((r = read(f, buf, paclen)) > 0) {
671 for (p = buf; p < &buf[r]; ++p) {
680 signal(SIGALRM, login_timeout);
682 write(0, "login: ", 7);
683 r = read(0, buf, 20);
685 die("No login or error (%d)", errno);
686 signal(SIGALRM, SIG_IGN);
689 if (buf[r-1] == ' ' || buf[r-1] == '\r' || buf[r-1] == '\n')
695 call = strupper(buf);
696 if (!iscallsign(call)) {
697 die("Sorry, %s isn't a valid callsign", buf);
701 /* connect up stdin */
702 in = fcb_new(0, TEXT);
703 in->sp = sel_open(0, in, "STDIN", fcb_handler, TEXT, SEL_INPUT);
704 if (tcgetattr(0, &in->t) < 0) {
708 struct termios t = in->t;
709 t.c_lflag &= ~(ECHO|ECHONL|ICANON);
710 if (tcsetattr(0, TCSANOW, &t) < 0)
711 die("tcsetattr (%d)", errno);
717 /* connect up node */
720 /* tell the cluster who I am */
721 send_msg(node, 'A', connsort, strlen(connsort));
723 /* main processing loop */