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>
45 #define MAXPATHLEN 256
56 #define UC unsigned char
60 int cnum; /* the connection number */
61 int sort; /* the type of connection either text or msg */
62 cmsg_t *in; /* current input message being built up */
63 cmsg_t *out; /* current output message being sent */
64 cmsg_t *obuf; /* current output being buffered */
65 reft *inq; /* input queue */
66 reft *outq; /* output queue */
67 sel_t *sp; /* my select fcb address */
68 struct termios t; /* any termios associated with this cnum */
69 char echo; /* echo characters back to this cnum */
70 char t_set; /* the termios structure is valid */
71 char buffer_it; /* buffer outgoing packets for paclen */
81 char *node_addr = "localhost"; /* the node tcp address, can be overridden by DXSPIDER_HOST */
82 int node_port = 27754; /* the tcp port of the node at the above address can be overidden by DXSPIDER_PORT*/
83 char *call; /* the caller's callsign */
84 char *connsort; /* the type of connection */
85 fcb_t *in; /* the fcb of 'stdin' that I shall use */
86 fcb_t *node; /* the fcb of the msg system */
87 char nl = '\n'; /* line end character */
88 char mode = 1; /* 0 - ax25, 1 - normal telnet, 2 - nlonly telnet */
89 char ending = 0; /* set this to end the program */
90 char echo = 1; /* echo characters on stdout from stdin */
91 char int_tabs = 0; /* interpret tabs -> spaces */
92 char *root = "/spider"; /* root of data tree, can be overridden by DXSPIDER_ROOT */
93 int timeout = 60; /* default timeout for logins and things */
94 int paclen = DEFPACLEN; /* default buffer size for outgoing packets */
95 int tabsize = 8; /* default tabsize for text messages */
96 char *connsort = "local"; /* the connection variety */
97 int state = 0; /* the current state of the connection */
98 int laststate = 0; /* the last state we were in */
99 reft echobase; /* the anti echo queue */
100 int maxecho = 5; /* the depth of the anti echo queue */
101 int echon; /* no of entries in the anti echo queue */
103 #define CONNECTED 100
109 myregex_t iscallreg[] = { /* regexes to determine whether this is a reasonable callsign */
111 "^[A-Z]+[0-9]+[A-Z]+[1-9]?$", 0 /* G1TLH G1TLH1 */
114 "^[0-9]+[A-Z]+[0-9]+[A-Z]+[1-9]?$", 0 /* 2E0AAA 2E0AAA1 */
117 "^[A-Z]+[0-9]+[A-Z]+-[0-9]$", 0 /* G1TLH-2 */
120 "^[0-9]+[A-Z]+[0-9]+[A-Z]+-[0-9]$", 0 /* 2E0AAA-2 */
123 "^[A-Z]+[0-9]+[A-Z]+-1[0-5]$", 0 /* G1TLH-11 */
126 "^[0-9]+[A-Z]+[0-9]+[A-Z]+-1[0-5]$", 0 /* 2E0AAA-11 */
136 * utility routines - various
139 void chgstate(int new)
143 dbg(DSTS, "chg state %d->%d", laststate, state);
146 void die(char *s, ...)
152 vsnprintf(buf, sizeof(buf)-1, s, ap);
154 fprintf(stderr,"%s\n", buf);
158 char *strupper(char *s)
160 char *d = malloc(strlen(s)+1);
164 die("out of room in strupper");
165 while (*p++ = toupper(*s++)) ;
169 char *strlower(char *s)
171 char *d = malloc(strlen(s)+1);
175 die("out of room in strlower");
176 while (*p++ = tolower(*s++)) ;
180 int eq(char *a, char *b)
182 return (strcmp(a, b) == 0);
185 FILE *xopen(char *dir, char *name, char *mode)
187 char fn[MAXPATHLEN+1];
188 snprintf(fn, MAXPATHLEN, "%s/%s/%s", root, dir, name);
189 return fopen(fn, mode);
192 int iscallsign(char *s)
196 if (strlen(s) > MAXCALLSIGN)
199 for (rp = iscallreg; rp->in; ++rp) {
200 if (regexec(rp->regex, s, 0, 0, 0) == 0)
207 * higher level send and receive routines
210 fcb_t *fcb_new(int cnum, int sort)
212 fcb_t *f = malloc(sizeof(fcb_t));
214 die("no room in fcb_new");
215 memset (f, 0, sizeof(fcb_t));
218 f->inq = chain_new();
219 f->outq = chain_new();
223 void flush_text(fcb_t *f)
226 /* save this onto the front of the echo chain */
227 cmsg_t *imp = f->obuf;
228 int size = imp->inp - imp->data;
229 cmsg_t *emp = cmsg_new(size, imp->sort, imp->portp);
232 memcpy(emp->data, imp->data, size);
233 emp->inp = emp->data + size; /* just in case */
234 chain_add(&echobase, emp);
235 if (++echon > maxecho) {
236 emp = cmsg_prev(&echobase);
240 /* queue it for sending */
241 cmsg_send(f->outq, imp, 0);
242 f->sp->flags |= SEL_OUTPUT;
247 void send_text(fcb_t *f, char *s, int l, int nlreq)
252 if (f->buffer_it && f->obuf) {
255 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
258 /* remove trailing spaces */
259 while (l > 0 &&isspace(s[l-1]))
262 for (p = s; p < s+l; ) {
263 if (mp->inp >= mp->data + paclen) {
265 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
269 if (mp->inp >= mp->data + paclen) {
271 f->obuf = mp = cmsg_new(paclen+1, f->sort, f);
286 void send_msg(fcb_t *f, char let, UC *s, int l)
290 int myl = strlen(call)+2+l;
292 mp = cmsg_new(myl+4+1, f->sort, f);
294 strcpy(mp->inp, call);
295 mp->inp += strlen(call);
299 for (p = s; p < s+l; ++p) {
300 if (mp->inp >= mp->data + (myl - 4)) {
301 int off = mp->inp - mp->data;
303 mp = realloc(mp, myl);
304 mp->inp = mp->data + off;
307 if (*p < 0x20 || *p > 0x7e || *p == '%') {
308 sprintf(mp->inp, "%%%02X", *p & 0xff);
309 mp->inp += strlen(mp->inp);
316 cmsg_send(f->outq, mp, 0);
317 f->sp->flags |= SEL_OUTPUT;
321 * send a file out to the user
323 void send_file(char *name)
326 char buf[MAXPACLEN+1];
328 FILE *f = xopen("data", name, "r");
330 while (fgets(buf, paclen, f)) {
332 if (i && buf[i-1] == '\n')
334 send_text(in, buf, i, 1);
341 * the callback (called by sel_run) that handles all the inputs and outputs
344 int fcb_handler(sel_t *sp, int in, int out, int err)
351 if (ending == 0 && in) {
352 char *p, buf[MAXBUFL];
355 /* read what we have into a buffer */
356 r = read(f->cnum, buf, MAXBUFL);
364 dbg(DBUF,"got errno %d in input", errno);
369 dbg(DBUF, "ending normally");
374 dbgdump(DBUF, "in ->", buf, r);
376 /* create a new message buffer if required */
378 f->in = cmsg_new(MAXBUFL+1, f->sort, f);
385 omp = cmsg_new(3*r+1, f->sort, f);
386 while (r > 0 && p < &buf[r]) {
388 /* echo processing */
393 strcpy(omp->inp, "\b \b");
394 omp->inp += strlen(omp->inp);
399 strcpy(omp->inp, "\r\n");
407 /* character processing */
411 memset(mp->inp, ' ', tabsize);
420 if (mp->inp > mp->data)
425 if (nl == '\n' && *p == '\r') { /* ignore \r in telnet mode (ugh) */
427 } else if (nl == '\r' && *p == '\n') { /* and ignore \n in ax25 mode (double ugh) */
429 } else if (*p == nl) {
430 if (mp->inp == mp->data)
432 *mp->inp = 0; /* zero terminate it, but don't include it in the length */
433 dbgdump(DMSG, "QUEUE TEXT", mp->data, mp->inp-mp->data);
434 cmsg_send(f->inq, mp, 0);
435 f->in = mp = cmsg_new(MAXBUFL+1, f->sort, f);
438 if (mp->inp < &mp->data[MAXBUFL-8])
447 /* queue any echo text */
449 dbgdump(DMSG, "QUEUE ECHO TEXT", omp->data, omp->inp - omp->data);
450 cmsg_send(f->outq, omp, 0);
451 f->sp->flags |= SEL_OUTPUT;
458 while (r > 0 && p < &buf[r]) {
461 if (mp->inp >= mp->data + (MAXBUFL-1)) {
464 dbg(DMSG, "Message longer than %d received", MAXBUFL);
472 } else if (ch == '\n') {
473 /* kick it upstairs */
475 dbgdump(DMSG, "QUEUE MSG", mp->data, mp->inp - mp->data);
476 cmsg_send(f->inq, mp, 0);
477 mp = f->in = cmsg_new(MAXBUFL+1, f->sort, f);
478 } else if (ch < 0x20 || ch > 0x7e) {
479 dbg(DMSG, "Illegal character (0x%02X) received", *p);
488 if (ch >= '0' && ch <= '9')
490 else if (ch >= 'A' && ch <= 'F')
491 c = (ch - 'A' + 10) << 4;
493 dbg(DMSG, "Illegal hex char (%c) received in state 1", ch);
500 if (ch >= '0' && ch <= '9')
501 *mp->inp++ = c | (ch - '0');
502 else if (ch >= 'A' && ch <= 'F')
503 *mp->inp++ = c | (ch - 'A' + 10);
505 dbg(DMSG, "Illegal hex char (%c) received in state 2", ch);
514 die("invalid sort (%d) in input handler", f->sort);
524 mp = f->out = cmsg_next(f->outq);
526 sp->flags &= ~SEL_OUTPUT;
531 l = mp->size - (mp->inp - mp->data);
534 dbgdump(DBUF, "<-out", mp->inp, l);
536 r = write(f->cnum, mp->inp, l);
544 dbg(DBUF,"got errno %d in output", errno);
552 die("got negative length in handler on node");
553 if (mp->inp - mp->data >= mp->size) {
554 cmsg_callback(mp, 0);
563 * set up the various mode flags, NL endings and things
565 void setmode(char *m)
567 connsort = strlower(m);
568 if (eq(connsort, "telnet") || eq(connsort, "local") || eq(connsort, "nlonly")) {
571 mode = eq(connsort, "nlonly") ? 2 : 1;
572 } else if (eq(connsort, "ax25")) {
576 } else if (eq(connsort, "connect")) {
581 die("Connection type must be \"telnet\", \"nlonly\", \"ax25\", \"login\" or \"local\"");
587 * things to do with ongoing processing of inputs
592 cmsg_t *wmp, *mp = cmsg_next(in->inq);
593 char *p, hasa, hasn, i;
594 char callsign[MAXCALLSIGN+1];
597 dbg(DMSG, "MSG size: %d", mp->size);
599 /* check for echos */
600 for (wmp = 0; wmp = chain_get_next(&echobase, wmp); ) {
601 if (!memcmp(wmp->data, mp->data, wmp->size)) {
602 cmsg_callback(mp, 0);
610 send_msg(node, 'I', mp->data, mp->size);
614 for (i = 0; i < mp->size; ++i) {
616 if (i < MAXCALLSIGN) {
621 if (isalnum(ch) || ch == '-')
624 die("invalid callsign");
626 die("invalid callsign");
629 if (strlen(callsign) < 3)
630 die("invalid callsign");
634 die("invalid callsign");
635 call = strupper(callsign);
637 /* check the callsign against the regexes */
638 if (!iscallsign(call)) {
639 die("Sorry, %s isn't a valid callsign", call);
642 /* strip off a '-0' at the end */
644 if (call[i-1] == '0' && call[i-2] == '-')
648 signal(SIGALRM, SIG_IGN);
650 /* tell the cluster who I am */
651 send_msg(node, 'A', connsort, strlen(connsort));
654 send_file("connected");
657 cmsg_callback(mp, 0);
664 cmsg_t *mp = cmsg_next(node->inq);
666 dbg(DMSG, "MSG size: %d", mp->size);
668 if (mp->size > 0 && mp->inp > mp->data) {
669 char *p = strchr(mp->data, '|');
672 switch (mp->data[0]) {
682 in->buffer_it = *p - '0';
686 int l = mp->inp - (UC *) p;
687 send_text(in, p, l, 1);
694 cmsg_callback(mp, 0);
701 * things to do with going away
704 void term_timeout(int i)
706 /* none of this is going to be reused so don't bother cleaning up properly */
708 tcsetattr(0, TCSANOW, &in->t);
710 shutdown(node->cnum, 3);
716 void terminate(int i)
718 signal(SIGALRM, term_timeout);
721 while ((in && !is_chain_empty(in->outq)) ||
722 (node && !is_chain_empty(node->outq))) {
726 tcsetattr(0, TCSADRAIN, &in->t);
728 shutdown(node->cnum, 3);
734 void login_timeout(int i)
736 write(0, "Timed Out", 10);
738 sel_run(); /* force a coordination */
740 tcsetattr(0, TCSANOW, &in->t);
745 * things to do with initialisation
748 void initargs(int argc, char *argv[])
752 while ((c = getopt(argc, argv, "h:p:x:")) > 0) {
758 paclen = atoi(optarg);
761 if (paclen > MAXPACLEN)
765 node_port = atoi(optarg);
769 dbgset(atoi(optarg));
779 die("usage: client [-x n|-h<host>|-p<port>|-l<paclen>] <call>|login [local|telnet|ax25]");
783 call = strupper(argv[optind]);
787 die("Must have at least a callsign (for now)");
790 setmode(argv[optind]);
795 /* this is kludgy, but hey so is the rest of this! */
796 if (mode != 0 && paclen == DEFPACLEN) {
801 void connect_to_node()
803 struct hostent *hp, *gethostbyname();
804 struct sockaddr_in server;
808 if ((hp = gethostbyname(node_addr)) == 0)
809 die("Unknown host tcp host %s for printer", node_addr);
811 memset(&server, 0, sizeof server);
812 server.sin_family = AF_INET;
813 memcpy(&server.sin_addr, hp->h_addr, hp->h_length);
814 server.sin_port = htons(node_port);
816 nodef = socket(AF_INET, SOCK_STREAM, 0);
818 die("Can't open socket to %s port %d (%d)", node_addr, node_port, errno);
820 if (connect(nodef, (struct sockaddr *) &server, sizeof server) < 0) {
821 die("Error on connect to %s port %d (%d)", node_addr, node_port, errno);
823 node = fcb_new(nodef, MSG);
824 node->sp = sel_open(nodef, node, "Msg System", fcb_handler, MSG, SEL_INPUT);
829 * the program itself....
832 main(int argc, char *argv[])
834 /* compile regexes for iscallsign */
837 for (rp = iscallreg; rp->in; ++rp) {
839 int r = regcomp(®, rp->in, REG_EXTENDED|REG_ICASE|REG_NOSUB);
841 die("regcomp returned %d for '%s'", r, rp->in);
842 rp->regex = malloc(sizeof(regex_t));
844 die("out of room - compiling regexes");
849 /* set up environment */
851 char *p = getenv("DXSPIDER_ROOT");
854 p = getenv("DXSPIDER_HOST");
857 p = getenv("DXSPIDER_PORT");
860 p = getenv("DXSPIDER_PACLEN");
865 if (paclen > MAXPACLEN)
870 /* get program arguments, initialise stuff */
871 initargs(argc, argv);
872 sel_init(10, 0, 10000);
875 signal(SIGHUP, SIG_IGN);
876 signal(SIGINT, terminate);
877 signal(SIGQUIT, terminate);
878 signal(SIGTERM, terminate);
880 signal(SIGPWR, terminate);
882 /* init a few things */
883 chain_init(&echobase);
885 /* connect up stdin */
886 in = fcb_new(0, TEXT);
887 in->sp = sel_open(0, in, "STDIN", fcb_handler, TEXT, SEL_INPUT);
888 if (tcgetattr(0, &in->t) < 0) {
893 struct termios t = in->t;
894 t.c_lflag &= ~(ECHO|ECHONL|ICANON);
896 if (tcsetattr(0, TCSANOW, &t) < 0)
897 die("tcsetattr (%d)", errno);
903 /* connect up node */
906 /* is this a login? */
907 if (eq(call, "LOGIN") || eq(call, "login")) {
909 signal(SIGALRM, login_timeout);
911 send_text(in, "login: ", 7, 0);
916 /* check the callsign against the regexes */
917 if (!iscallsign(call)) {
918 die("Sorry, %s isn't a valid callsign", call);
921 /* strip off a '-0' at the end */
923 if (call[i-1] == '0' && call[i-2] == '-')
926 /* tell the cluster who I am */
927 send_msg(node, 'A', connsort, strlen(connsort));
930 send_file("connected");
934 /* main processing loop */
935 while (ending == 0) {