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>
44 #define MAXPATHLEN 256
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 */
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 */
93 myregex_t iscallreg[] = { /* regexes to determine whether this is a reasonable callsign */
95 "^[A-Z]+[0-9]+[A-Z]+[1-9]?$", 0 /* G1TLH G1TLH1 */
98 "^[0-9]+[A-Z]+[0-9]+[A-Z]+[1-9]?$", 0 /* 2E0AAA 2E0AAA1 */
101 "^[A-Z]+[0-9]+[A-Z]+-[1-9]$", 0 /* G1TLH-2 */
104 "^[0-9]+[A-Z]+[0-9]+[A-Z]+-[1-9]$", 0 /* 2E0AAA-2 */
107 "^[A-Z]+[0-9]+[A-Z]+-1[0-5]$", 0 /* G1TLH-11 */
110 "^[0-9]+[A-Z]+[0-9]+[A-Z]+-1[0-5]$", 0 /* 2E0AAA-11 */
120 * utility routines - various
123 void die(char *s, ...)
129 vsnprintf(buf, sizeof(buf)-1, s, ap);
131 fprintf(stderr,"%s\n", buf);
135 char *strupper(char *s)
137 char *d = malloc(strlen(s)+1);
141 die("out of room in strupper");
142 while (*p++ = toupper(*s++)) ;
146 char *strlower(char *s)
148 char *d = malloc(strlen(s)+1);
152 die("out of room in strlower");
153 while (*p++ = tolower(*s++)) ;
157 int eq(char *a, char *b)
159 return (strcmp(a, b) == 0);
162 int xopen(char *dir, char *name, int mode)
164 char fn[MAXPATHLEN+1];
165 snprintf(fn, MAXPATHLEN, "%s/%s/%s", root, dir, name);
166 return open(fn, mode);
169 int iscallsign(char *s)
173 if (strlen(s) > MAXCALLSIGN)
176 for (rp = iscallreg; rp->in; ++rp) {
177 if (regexec(rp->regex, s, 0, 0, 0) == 0)
184 * higher level send and receive routines
187 fcb_t *fcb_new(int cnum, int sort)
189 fcb_t *f = malloc(sizeof(fcb_t));
191 die("no room in fcb_new");
192 memset (f, 0, sizeof(fcb_t));
195 f->inq = chain_new();
196 f->outq = chain_new();
200 void flush_text(fcb_t *f)
203 cmsg_send(f->outq, f->obuf, 0);
204 f->sp->flags |= SEL_OUTPUT;
209 void send_text(fcb_t *f, char *s, int l)
214 if (f->buffer_it && f->obuf) {
217 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
220 /* remove trailing spaces */
221 while (l > 0 &&isspace(s[l-1]))
224 for (p = s; p < s+l; ) {
225 if (mp->inp >= mp->data + paclen) {
227 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
231 if (mp->inp >= mp->data + paclen) {
233 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
240 void send_msg(fcb_t *f, char let, char *s, int l)
244 int myl = strlen(call)+2+l;
246 mp = cmsg_new(myl+4+1, f->sort, f);
248 memcpy(mp->inp, &ln, 4);
251 strcpy(mp->inp, call);
252 mp->inp += strlen(call);
255 memcpy(mp->inp, s, l);
259 cmsg_send(f->outq, mp, 0);
260 f->sp->flags |= SEL_OUTPUT;
264 * the callback (called by sel_run) that handles all the inputs and outputs
267 int fcb_handler(sel_t *sp, int in, int out, int err)
274 char *p, buf[MAXBUFL];
277 /* read what we have into a buffer */
278 r = read(f->cnum, buf, MAXBUFL);
298 dbgdump(DBUF, "in ->", buf, r);
300 /* create a new message buffer if required */
302 f->in = cmsg_new(MAXBUFL+1, f->sort, f);
309 omp = cmsg_new(3*r+1, f->sort, f);
310 while (r > 0 && p < &buf[r]) {
312 /* echo processing */
317 strcpy(omp->inp, "\b \b");
318 omp->inp += strlen(omp->inp);
325 /* character processing */
329 memset(mp->inp, ' ', tabsize);
338 if (mp->inp > mp->data)
343 if (nl == '\n' && *p == '\r') { /* ignore \r in telnet mode (ugh) */
345 } else if (*p == nl) {
346 if (mp->inp == mp->data)
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);
354 if (mp->inp < &mp->data[MAXBUFL-8])
363 /* queue any echo text */
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;
374 while (r > 0 && p < &buf[r]) {
376 /* build up the size into the likely message length (yes I know it's a short) */
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);
390 if (mp->inp - mp->data < mp->size) {
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);
404 die("invalid sort (%d) in input handler", f->sort);
414 mp = f->out = cmsg_next(f->outq);
416 sp->flags &= ~SEL_OUTPUT;
421 l = mp->size - (mp->inp - mp->data);
424 dbgdump(DBUF, "<-out", mp->inp, l);
426 r = write(f->cnum, mp->inp, l);
443 die("got negative length in handler on node");
444 if (mp->inp - mp->data >= mp->size) {
445 cmsg_callback(mp, 0);
454 * things to do with initialisation
457 void initargs(int argc, char *argv[])
461 while ((c = getopt(argc, argv, "h:p:x:")) > 0) {
467 paclen = atoi(optarg);
470 if (paclen > MAXPACLEN)
474 node_port = atoi(optarg);
478 dbgset(atoi(optarg));
488 die("usage: client [-x n|-h<host>|-p<port>|-l<paclen>] <call>|login [local|telnet|ax25]");
492 call = strupper(argv[optind]);
496 die("Must have at least a callsign (for now)");
499 connsort = strlower(argv[optind]);
500 if (eq(connsort, "telnet") || eq(connsort, "local")) {
503 } else if (eq(connsort, "ax25")) {
507 die("2nd argument must be \"telnet\" or \"ax25\" or \"local\"");
515 /* this is kludgy, but hey so is the rest of this! */
516 if (!eq(connsort, "ax25") && paclen == DEFPACLEN) {
521 void connect_to_node()
523 struct hostent *hp, *gethostbyname();
524 struct sockaddr_in server;
528 if ((hp = gethostbyname(node_addr)) == 0)
529 die("Unknown host tcp host %s for printer", node_addr);
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);
536 nodef = socket(AF_INET, SOCK_STREAM, 0);
538 die("Can't open socket to %s port %d (%d)", node_addr, node_port, errno);
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);
543 node = fcb_new(nodef, MSG);
544 node->sp = sel_open(nodef, node, "Msg System", fcb_handler, MSG, SEL_INPUT);
549 * things to do with going away
552 void term_timeout(int i)
554 /* none of this is going to be reused so don't bother cleaning up properly */
556 tcsetattr(0, TCSANOW, &in->t);
563 void terminate(int i)
565 if (node && send_Z && call) {
566 send_msg(node, 'Z', "", 0);
569 signal(SIGALRM, term_timeout);
572 while ((in && !is_chain_empty(in->outq)) ||
573 (node && !is_chain_empty(node->outq))) {
577 tcsetattr(0, TCSADRAIN, &in->t);
583 void login_timeout(int i)
585 write(0, "Timed Out", 10);
587 sel_run(); /* force a coordination */
589 tcsetattr(0, TCSANOW, &in->t);
594 * things to do with ongoing processing of inputs
599 cmsg_t *mp = cmsg_next(in->inq);
601 dbg(DMSG, "MSG size: %d", mp->size);
603 if (mp->size > 0 && mp->inp > mp->data) {
604 send_msg(node, 'I', mp->data, mp->size);
606 cmsg_callback(mp, 0);
612 cmsg_t *mp = cmsg_next(node->inq);
614 dbg(DMSG, "MSG size: %d", mp->size);
616 if (mp->size > 0 && mp->inp > mp->data) {
617 char *p = strchr(mp->data, '|');
620 switch (mp->data[0]) {
631 in->buffer_it = *p - '0';
635 int l = mp->inp - (unsigned char *) p;
643 cmsg_callback(mp, 0);
650 * the program itself....
653 main(int argc, char *argv[])
655 /* set up environment */
657 char *p = getenv("DXSPIDER_ROOT");
660 p = getenv("DXSPIDER_HOST");
663 p = getenv("DXSPIDER_PORT");
666 p = getenv("DXSPIDER_PACLEN");
671 if (paclen > MAXPACLEN)
676 /* get program arguments, initialise stuff */
677 initargs(argc, argv);
678 sel_init(10, 0, 10000);
681 signal(SIGHUP, SIG_IGN);
682 signal(SIGINT, terminate);
683 signal(SIGQUIT, terminate);
684 signal(SIGTERM, terminate);
686 signal(SIGPWR, terminate);
689 /* compile regexes for iscallsign */
692 for (rp = iscallreg; rp->in; ++rp) {
694 int r = regcomp(®, rp->in, REG_EXTENDED|REG_ICASE|REG_NOSUB);
696 die("regcomp returned %d for '%s'", r, rp->in);
697 rp->regex = malloc(sizeof(regex_t));
699 die("out of room - compiling regexes");
704 /* is this a login? */
705 if (eq(call, "LOGIN")) {
706 char buf[MAXPACLEN+1];
708 int f = xopen("data", "issue", 0);
710 while ((r = read(f, buf, paclen)) > 0) {
713 for (p = buf; p < &buf[r]; ++p) {
722 signal(SIGALRM, login_timeout);
724 write(0, "login: ", 7);
725 r = read(0, buf, 20);
727 die("No login or error (%d)", errno);
728 signal(SIGALRM, SIG_IGN);
731 if (buf[r-1] == ' ' || buf[r-1] == '\r' || buf[r-1] == '\n')
737 call = strupper(buf);
740 /* check the callsign */
741 if (!iscallsign(call)) {
742 die("Sorry, %s isn't a valid callsign", call);
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) {
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);
761 /* connect up node */
764 /* tell the cluster who I am */
765 send_msg(node, 'A', connsort, strlen(connsort));
767 /* main processing loop */