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
55 int cnum; /* the connection number */
56 int sort; /* the type of connection either text or msg */
57 cmsg_t *in; /* current input message being built up */
58 cmsg_t *out; /* current output message being sent */
59 cmsg_t *obuf; /* current output being buffered */
60 reft *inq; /* input queue */
61 reft *outq; /* output queue */
62 sel_t *sp; /* my select fcb address */
63 struct termios t; /* any termios associated with this cnum */
64 char echo; /* echo characters back to this cnum */
65 char t_set; /* the termios structure is valid */
66 char buffer_it; /* buffer outgoing packets for paclen */
76 char *node_addr = "localhost"; /* the node tcp address, can be overridden by DXSPIDER_HOST */
77 int node_port = 27754; /* the tcp port of the node at the above address can be overidden by DXSPIDER_PORT*/
78 char *call; /* the caller's callsign */
79 char *connsort; /* the type of connection */
80 fcb_t *in; /* the fcb of 'stdin' that I shall use */
81 fcb_t *node; /* the fcb of the msg system */
82 char nl = '\n'; /* line end character */
83 char ending = 0; /* set this to end the program */
84 char send_Z = 1; /* set a Z record to the node on termination */
85 char echo = 1; /* echo characters on stdout from stdin */
86 char int_tabs = 0; /* interpret tabs -> spaces */
87 char *root = "/spider"; /* root of data tree, can be overridden by DXSPIDER_ROOT */
88 int timeout = 60; /* default timeout for logins and things */
89 int paclen = DEFPACLEN; /* default buffer size for outgoing packets */
90 int tabsize = 8; /* default tabsize for text messages */
92 myregex_t iscallreg[] = { /* regexes to determine whether this is a reasonable callsign */
94 "^[A-Z]+[0-9]+[A-Z]+[1-9]?$", 0
97 "^[0-9]+[A-Z]+[0-9]+[A-Z]+[1-9]?$", 0
100 "^[A-Z]+[0-9]+[A-Z]+[1-9]?-[1-9]$", 0
103 "^[0-9]+[A-Z]+[0-9]+[A-Z]+[1-9]?-[1-9]$", 0
106 "^[A-Z]+[0-9]+[A-Z]+[1-9]?-1[0-5]$", 0
109 "^[0-9]+[A-Z]+[0-9]+[A-Z]+[1-9]?-1[0-5]$", 0
119 * utility routines - various
122 void die(char *s, ...)
128 vsnprintf(buf, sizeof(buf)-1, s, ap);
130 fprintf(stderr,"%s\n", buf);
134 char *strupper(char *s)
136 char *d = malloc(strlen(s)+1);
140 die("out of room in strupper");
141 while (*p++ = toupper(*s++)) ;
145 char *strlower(char *s)
147 char *d = malloc(strlen(s)+1);
151 die("out of room in strlower");
152 while (*p++ = tolower(*s++)) ;
156 int eq(char *a, char *b)
158 return (strcmp(a, b) == 0);
161 int xopen(char *dir, char *name, int mode)
163 char fn[MAXPATHLEN+1];
164 snprintf(fn, MAXPATHLEN, "%s/%s/%s", root, dir, name);
165 return open(fn, mode);
168 int iscallsign(char *s)
171 for (rp = iscallreg; rp->in; ++rp) {
172 if (regexec(rp->regex, s, 0, 0, 0) == 0)
179 * higher level send and receive routines
182 fcb_t *fcb_new(int cnum, int sort)
184 fcb_t *f = malloc(sizeof(fcb_t));
186 die("no room in fcb_new");
187 memset (f, 0, sizeof(fcb_t));
190 f->inq = chain_new();
191 f->outq = chain_new();
195 void flush_text(fcb_t *f)
198 cmsg_send(f->outq, f->obuf, 0);
199 f->sp->flags |= SEL_OUTPUT;
204 void send_text(fcb_t *f, char *s, int l)
209 if (f->buffer_it && f->obuf) {
212 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
215 /* ignore trailing spaces */
216 while (l > 0 &&isspace(s[l-1]))
219 for (p = s; p < s+l; ) {
220 if (mp->inp >= mp->data + paclen) {
222 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
226 if (mp->inp >= mp->data + paclen) {
228 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
235 void send_msg(fcb_t *f, char let, char *s, int l)
239 int myl = strlen(call)+2+l;
241 mp = cmsg_new(myl+4+1, f->sort, f);
243 memcpy(mp->inp, &ln, 4);
246 strcpy(mp->inp, call);
247 mp->inp += strlen(call);
250 memcpy(mp->inp, s, l);
254 cmsg_send(f->outq, mp, 0);
255 f->sp->flags |= SEL_OUTPUT;
259 * the callback (called by sel_run) that handles all the inputs and outputs
262 int fcb_handler(sel_t *sp, int in, int out, int err)
269 char *p, buf[MAXBUFL];
272 /* read what we have into a buffer */
273 r = read(f->cnum, buf, MAXBUFL);
293 dbgdump(DBUF, "in ->", buf, r);
295 /* create a new message buffer if required */
297 f->in = cmsg_new(MAXBUFL+1, f->sort, f);
304 omp = cmsg_new(3*r+1, f->sort, f);
305 while (r > 0 && p < &buf[r]) {
307 /* echo processing */
312 strcpy(omp->inp, "\b \b");
313 omp->inp += strlen(omp->inp);
320 /* character processing */
324 memset(mp->inp, ' ', tabsize);
333 if (mp->inp > mp->data)
338 if (nl == '\n' && *p == '\r') { /* ignore \r in telnet mode (ugh) */
340 } else if (*p == nl) {
341 if (mp->inp == mp->data)
343 *mp->inp = 0; /* zero terminate it, but don't include it in the length */
344 dbgdump(DMSG, "QUEUE TEXT", mp->data, mp->inp-mp->data);
345 cmsg_send(f->inq, mp, 0);
346 f->in = mp = cmsg_new(MAXBUFL+1, f->sort, f);
349 if (mp->inp < &mp->data[MAXBUFL-8])
358 /* queue any echo text */
360 dbgdump(DMSG, "QUEUE ECHO TEXT", omp->data, omp->inp - omp->data);
361 cmsg_send(f->outq, omp, 0);
362 f->sp->flags |= SEL_OUTPUT;
369 while (r > 0 && p < &buf[r]) {
371 /* build up the size into the likely message length (yes I know it's a short) */
379 mp->size = (mp->size << 8) | (*p++ & 0xff);
380 if (mp->size > MAXBUFL)
381 die("Message size too big from node (%d > %d)", mp->size, MAXBUFL);
385 if (mp->inp - mp->data < mp->size) {
388 if (mp->inp - mp->data >= mp->size) {
389 /* kick it upstairs */
390 dbgdump(DMSG, "QUEUE MSG", mp->data, mp->inp - mp->data);
391 cmsg_send(f->inq, mp, 0);
392 mp = f->in = cmsg_new(MAXBUFL+1, f->sort, f);
399 die("invalid sort (%d) in input handler", f->sort);
409 mp = f->out = cmsg_next(f->outq);
411 sp->flags &= ~SEL_OUTPUT;
416 l = mp->size - (mp->inp - mp->data);
419 dbgdump(DBUF, "<-out", mp->inp, l);
421 r = write(f->cnum, mp->inp, l);
438 die("got negative length in handler on node");
439 if (mp->inp - mp->data >= mp->size) {
440 cmsg_callback(mp, 0);
449 * things to do with initialisation
452 void initargs(int argc, char *argv[])
456 while ((c = getopt(argc, argv, "h:p:x:")) > 0) {
462 paclen = atoi(optarg);
465 if (paclen > MAXPACLEN)
469 node_port = atoi(optarg);
473 dbgset(atoi(optarg));
483 die("usage: client [-x n|-h<host>|-p<port>|-l<paclen>] <call>|login [local|telnet|ax25]");
487 call = strupper(argv[optind]);
491 die("Must have at least a callsign (for now)");
494 connsort = strlower(argv[optind]);
495 if (eq(connsort, "telnet") || eq(connsort, "local")) {
498 } else if (eq(connsort, "ax25")) {
502 die("2nd argument must be \"telnet\" or \"ax25\" or \"local\"");
510 /* this is kludgy, but hey so is the rest of this! */
511 if (!eq(connsort, "ax25") && paclen == DEFPACLEN) {
516 void connect_to_node()
518 struct hostent *hp, *gethostbyname();
519 struct sockaddr_in server;
523 if ((hp = gethostbyname(node_addr)) == 0)
524 die("Unknown host tcp host %s for printer", node_addr);
526 memset(&server, 0, sizeof server);
527 server.sin_family = AF_INET;
528 memcpy(&server.sin_addr, hp->h_addr, hp->h_length);
529 server.sin_port = htons(node_port);
531 nodef = socket(AF_INET, SOCK_STREAM, 0);
533 die("Can't open socket to %s port %d (%d)", node_addr, node_port, errno);
535 if (connect(nodef, (struct sockaddr *) &server, sizeof server) < 0) {
536 die("Error on connect to %s port %d (%d)", node_addr, node_port, errno);
538 node = fcb_new(nodef, MSG);
539 node->sp = sel_open(nodef, node, "Msg System", fcb_handler, MSG, SEL_INPUT);
544 * things to do with going away
547 void term_timeout(int i)
549 /* none of this is going to be reused so don't bother cleaning up properly */
551 tcsetattr(0, TCSANOW, &in->t);
558 void terminate(int i)
560 if (node && send_Z && call) {
561 send_msg(node, 'Z', "", 0);
564 signal(SIGALRM, term_timeout);
567 while ((in && !is_chain_empty(in->outq)) ||
568 (node && !is_chain_empty(node->outq))) {
572 tcsetattr(0, TCSADRAIN, &in->t);
578 void login_timeout(int i)
580 write(0, "Timed Out", 10);
582 sel_run(); /* force a coordination */
584 tcsetattr(0, TCSANOW, &in->t);
589 * things to do with ongoing processing of inputs
594 cmsg_t *mp = cmsg_next(in->inq);
596 dbg(DMSG, "MSG size: %d", mp->size);
598 if (mp->size > 0 && mp->inp > mp->data) {
599 send_msg(node, 'I', mp->data, mp->size);
601 cmsg_callback(mp, 0);
607 cmsg_t *mp = cmsg_next(node->inq);
609 dbg(DMSG, "MSG size: %d", mp->size);
611 if (mp->size > 0 && mp->inp > mp->data) {
612 char *p = strchr(mp->data, '|');
615 switch (mp->data[0]) {
626 in->buffer_it = *p - '0';
630 int l = mp->inp - (unsigned char *) p;
638 cmsg_callback(mp, 0);
645 * the program itself....
648 main(int argc, char *argv[])
650 /* set up environment */
652 char *p = getenv("DXSPIDER_ROOT");
655 p = getenv("DXSPIDER_HOST");
658 p = getenv("DXSPIDER_PORT");
661 p = getenv("DXSPIDER_PACLEN");
666 if (paclen > MAXPACLEN)
671 /* get program arguments, initialise stuff */
672 initargs(argc, argv);
673 sel_init(10, 0, 10000);
676 signal(SIGHUP, SIG_IGN);
677 signal(SIGINT, terminate);
678 signal(SIGQUIT, terminate);
679 signal(SIGTERM, terminate);
681 signal(SIGPWR, terminate);
684 /* compile regexes for iscallsign */
687 for (rp = iscallreg; rp->in; ++rp) {
689 int r = regcomp(®, rp->in, REG_EXTENDED|REG_ICASE|REG_NOSUB);
691 die("regcomp returned %d for '%s'", r, rp->in);
692 rp->regex = malloc(sizeof(regex_t));
694 die("out of room - compiling regexes");
699 /* is this a login? */
700 if (eq(call, "LOGIN")) {
701 char buf[MAXPACLEN+1];
703 int f = xopen("data", "issue", 0);
705 while ((r = read(f, buf, paclen)) > 0) {
708 for (p = buf; p < &buf[r]; ++p) {
717 signal(SIGALRM, login_timeout);
719 write(0, "login: ", 7);
720 r = read(0, buf, 20);
722 die("No login or error (%d)", errno);
723 signal(SIGALRM, SIG_IGN);
726 if (buf[r-1] == ' ' || buf[r-1] == '\r' || buf[r-1] == '\n')
732 call = strupper(buf);
735 /* check the callsign */
736 if (!iscallsign(call)) {
737 die("Sorry, %s isn't a valid callsign", call);
740 /* connect up stdin */
741 in = fcb_new(0, TEXT);
742 in->sp = sel_open(0, in, "STDIN", fcb_handler, TEXT, SEL_INPUT);
743 if (tcgetattr(0, &in->t) < 0) {
747 struct termios t = in->t;
748 t.c_lflag &= ~(ECHO|ECHONL|ICANON);
749 if (tcsetattr(0, TCSANOW, &t) < 0)
750 die("tcsetattr (%d)", errno);
756 /* connect up node */
759 /* tell the cluster who I am */
760 send_msg(node, 'A', connsort, strlen(connsort));
762 /* main processing loop */