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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: unetcfg.c,v 1.2 2001/02/03 18:39:59 mdw Exp $ |
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4 | * |
5 | * User-space network device support. |
6 | * |
7 | * (c) 1998 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Usernet. |
13 | * |
14 | * Usernet is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * Usernet is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with Usernet; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: unetcfg.c,v $ |
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32 | * Revision 1.2 2001/02/03 18:39:59 mdw |
33 | * Setting the maximum interface count now does the right thing. |
34 | * |
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35 | * Revision 1.1 2001/01/25 22:03:39 mdw |
36 | * Initial check-in (somewhat belated). |
37 | * |
38 | */ |
39 | |
40 | /*----- Include files -----------------------------------------------------*/ |
41 | |
42 | #include <errno.h> |
43 | #include <getopt.h> |
44 | #include <stdarg.h> |
45 | #include <stdio.h> |
46 | #include <stdlib.h> |
47 | #include <string.h> |
48 | |
49 | #include <linux/if_ether.h> |
50 | |
51 | #include <sys/types.h> |
52 | #include <sys/time.h> |
53 | #include <sys/ioctl.h> |
54 | |
55 | #include <fcntl.h> |
56 | #include <unistd.h> |
57 | |
58 | #include "unet.h" |
59 | |
60 | /*----- Static variables --------------------------------------------------*/ |
61 | |
62 | #define VERSION "1.00" |
63 | #define ETH_P_HELP 0xffffu |
64 | |
65 | static const char *quis = "unetcfg"; /* My program's name */ |
66 | static int flags = 0; /* Various useful status flags */ |
67 | static const char *current = "<stdin>"; /* Current Usernet device */ |
68 | static int fd = 0; /* Default to @stdin@ */ |
69 | |
70 | #define f_verbose 1u |
71 | #define f_duff 2u |
72 | #define f_check 4u |
73 | #define f_close 8u |
74 | |
75 | /*----- Common routines ---------------------------------------------------*/ |
76 | |
77 | /* --- @die@ --- * |
78 | * |
79 | * Arguments: @const char *format@ = format string to print |
80 | * @...@ = values for the placeholders |
81 | * |
82 | * Returns: Doesn't |
83 | * |
84 | * Use: Reports a fatal error message. |
85 | */ |
86 | |
87 | static void die(const char *format, ...) |
88 | { |
89 | va_list ap; |
90 | va_start(ap, format); |
91 | fputs(quis, stderr); |
92 | fputs(": ", stderr); |
93 | vfprintf(stderr, format, ap); |
94 | fputc('\n', stderr); |
95 | va_end(ap); |
96 | exit(EXIT_FAILURE); |
97 | } |
98 | |
99 | /* --- @whiiter@ --- * |
100 | * |
101 | * Arguments: @const char *format@ = format string to print |
102 | * @...@ = values for the placeholders |
103 | * |
104 | * Returns: Doesn't |
105 | * |
106 | * Use: Reports a non-fatal error message. |
107 | */ |
108 | |
109 | static void whitter(const char *format, ...) |
110 | { |
111 | va_list ap; |
112 | |
113 | if ((flags & f_verbose) == 0) |
114 | return; |
115 | |
116 | va_start(ap, format); |
117 | fputs(quis, stderr); |
118 | fputs(": ", stderr); |
119 | vfprintf(stderr, format, ap); |
120 | fputc('\n', stderr); |
121 | va_end(ap); |
122 | } |
123 | |
124 | /* --- @lookup@ --- * |
125 | * |
126 | * Arguments: @void *p@ = pointer to a table |
127 | * @size_t sz@ = size of the table items |
128 | * @const char *s@ = pointer to string to match |
129 | * |
130 | * Returns: Pointer to the matching block. |
131 | * |
132 | * Use: Finds an item in a table. |
133 | */ |
134 | |
135 | static void *lookup(const void *p, size_t sz, const char *s) |
136 | { |
137 | const char **q = (const char **)p; |
138 | const void *e = 0; |
139 | |
140 | while (*q) { |
141 | const char *x = *q, *y = s; |
142 | |
143 | for (;;) { |
144 | if (!*y) { |
145 | if (!*x) |
146 | return ((void *)q); |
147 | if (e) |
148 | die("ambiguous name `%s'", s); |
149 | e = q; |
150 | break; |
151 | } else if (*x == *y) { |
152 | x++; |
153 | y++; |
154 | continue; |
155 | } else |
156 | break; |
157 | } |
158 | q = (const char **)((const char *)q + sz); |
159 | } |
160 | return ((void *)e); |
161 | } |
162 | |
163 | #define LOOKUP(tbl, key) lookup((tbl), sizeof((tbl)[0]), (key)) |
164 | |
165 | /* --- @check@ --- * |
166 | * |
167 | * Arguments: --- |
168 | * |
169 | * Returns: --- |
170 | * |
171 | * Use: Ensures that the current device really is a Usernet device. |
172 | */ |
173 | |
174 | static void check(void) |
175 | { |
176 | if (flags & f_check) |
177 | return; |
178 | if (ioctl(fd, UNIOCGINFO, 0) < 0) |
179 | die("file `%s' is not a Usernet device", current); |
180 | flags |= f_check; |
181 | } |
182 | |
183 | /*----- Command implementations -------------------------------------------*/ |
184 | |
185 | /* --- Forward declarations --- */ |
186 | |
187 | struct command { |
188 | const char *cmd; /* Command name */ |
189 | int minarg; /* Minimum number of args */ |
190 | int (*func)(char **av); /* Command handler function */ |
191 | const char *syn, *shelp, *vhelp; /* Short and verbose help */ |
192 | }; |
193 | |
194 | static struct command cmdtab[]; |
195 | |
196 | struct eth_proto { |
197 | const char *name; /* User-level protocol name */ |
198 | unsigned short proto; /* Protocol number */ |
199 | const char *desc; /* Readable description */ |
200 | }; |
201 | |
202 | static struct eth_proto eth_prototab[]; |
203 | |
204 | #define YNQ_YES 1 |
205 | #define YNQ_NO 0 |
206 | #define YNQ_QUERY (-1) |
207 | |
208 | static struct ynq { |
209 | const char *s; |
210 | int val; |
211 | } ynqtab[] = { |
212 | { "query", YNQ_QUERY }, |
213 | { "show", YNQ_QUERY }, |
214 | { "?", YNQ_QUERY }, |
215 | { "yes", YNQ_YES }, |
216 | { "on", YNQ_YES }, |
217 | { "no", YNQ_NO }, |
218 | { "off", YNQ_NO }, |
219 | { 0, 0 } |
220 | }; |
221 | |
222 | static int run(char **av); |
223 | |
224 | /* --- @ynq@ --- * |
225 | * |
226 | * Arguments: @const char *p@ = pointer to string to decode |
227 | * |
228 | * Returns: One of the @YNQ@ codes. |
229 | * |
230 | * Use: Decodes a `yes/no/query' response. |
231 | */ |
232 | |
233 | static int ynq(const char *p) |
234 | { |
235 | struct ynq *ynq = LOOKUP(ynqtab, p); |
236 | if (!ynq) |
237 | die("unknown setting `%s': I understand `on', `off' and `query'", p); |
238 | return (ynq->val); |
239 | } |
240 | |
241 | /* --- @cmd_help@ --- */ |
242 | |
243 | static int cmd_help(char **av) |
244 | { |
245 | struct command *c; |
246 | |
247 | if (!*av) { |
248 | puts("Commands provided:\n"); |
249 | for (c = cmdtab; c->cmd; c++) |
250 | printf("%-30s%s\n", c->syn, c->shelp); |
251 | } else if ((c = LOOKUP(cmdtab, *av)) == 0) |
252 | die("unknown command: `%s'", *av); |
253 | else { |
254 | fputs(c->syn, stdout); |
255 | fputs("\n\n", stdout); |
256 | fputs(c->vhelp, stdout); |
257 | av++; |
258 | } |
259 | return (run(av)); |
260 | } |
261 | |
262 | /* --- @cmd_select@ --- */ |
263 | |
264 | static int cmd_select(char **av) |
265 | { |
266 | const char *fn = *av++; |
267 | if (flags & f_close) { |
268 | close(fd); |
269 | whitter("closed previous device `%s'", current); |
270 | } |
271 | fd = open(fn, O_RDWR); |
272 | if (fd < 0) |
273 | die("couldn't open Usernet device `%s': %s", fn, strerror(errno)); |
274 | current = fn; |
275 | flags &= ~f_check; |
276 | check(); |
277 | whitter("opened new device: `%s'", fn); |
278 | flags |= f_close; |
279 | return (run(av)); |
280 | } |
281 | |
282 | /* --- @cmd_fd@ --- */ |
283 | |
284 | static int cmd_fd(char **av) |
285 | { |
286 | const char *p; |
287 | static char namebuf[20]; /* XXX Big enough? */ |
288 | |
289 | static struct { |
290 | const char *name; |
291 | int fd; |
292 | const char *desc; |
293 | } *fdp, fdtab[] = { |
294 | { "stdin", 0, "<stdin>" }, |
295 | { "stdout", 1, "<stdout>" }, |
296 | { "stderr", 2, "<stderr>" }, |
297 | { 0, 0, 0 } |
298 | }; |
299 | |
300 | if (flags & f_close) { |
301 | close(fd); |
302 | whitter("closed previous device `%s'", current); |
303 | } |
304 | |
305 | p = *av++; |
306 | if ((fdp = LOOKUP(fdtab, p)) != 0) |
307 | fd = fdp->fd; |
308 | else if (sscanf(p, "%i", &fd) < 1 || fd < 0) |
309 | die("bad file descriptor name: `%s'", p); |
310 | |
311 | flags &= ~f_check | f_close; |
312 | if (fd < 3) |
313 | current = fdtab[fd].desc; |
314 | else |
315 | current = namebuf, sprintf(namebuf, "<fd %i>", fd); |
316 | |
317 | check(); |
318 | whitter("opened device on `%s'", current); |
319 | |
320 | return (run(av)); |
321 | } |
322 | |
323 | /* --- @cmd_show@ --- */ |
324 | |
325 | static int cmd_show(char **av) |
326 | { |
327 | struct unet_info uni; |
328 | const char *af, *proto; |
329 | |
330 | /* --- Name table for address families --- */ |
331 | |
332 | static const char *aftab[] = { |
333 | "Unspecified", |
334 | "Unix file domain (!)", |
335 | "Internet (IPv4)", |
336 | "Amateur radio AX.25", |
337 | "Novell IPX", |
338 | "Appletalk", |
339 | "Amateur radio NetROM", |
340 | "Multiprotocol bridge (!)", |
341 | "Reserved (for ATM)", |
342 | "Reserved (for X.25)", |
343 | "Internet (IPv6)", |
344 | }; |
345 | |
346 | /* --- Name table for Usernet flags --- */ |
347 | |
348 | static struct { |
349 | const char *name; |
350 | unsigned int f; |
351 | } *flp, fltab[] = { |
352 | { "trans", UNIF_TRANS }, |
353 | /* @{ "open", UNIF_OPEN }@ -- ignore: this flag always appears on */ |
354 | { "debug", UNIF_DEBUG }, |
355 | { 0, 0 } |
356 | }; |
357 | |
358 | /* --- Read the attachment information --- */ |
359 | |
360 | check(); |
361 | if (ioctl(fd, UNIOCGINFO, &uni) < 0) |
362 | die("couldn't read information about attachment: %s", strerror(errno)); |
363 | |
364 | /* --- Look the address family up --- */ |
365 | |
366 | if (uni.uni_family < sizeof(aftab) / sizeof(aftab[0])) |
367 | af = aftab[uni.uni_family]; |
368 | else |
369 | af = "Unknown family"; |
370 | |
371 | /* --- Look the protocol up --- */ |
372 | |
373 | { |
374 | struct eth_proto *ep; |
375 | |
376 | proto = "unknown"; |
377 | for (ep = eth_prototab; ep->name; ep++) { |
378 | if (ep->proto == uni.uni_proto) { |
379 | proto = ep->desc; |
380 | break; |
381 | } |
382 | } |
383 | } |
384 | |
385 | /* --- Display appropriate information --- */ |
386 | |
387 | printf("Interface name: %s\n", uni.uni_ifname); |
388 | printf("MTU: %u\n", uni.uni_mtu); |
389 | printf("Address family: %s\n", af); |
390 | printf("Protocol: %s\n", proto); |
391 | printf("Flags:"); |
392 | |
393 | for (flp = fltab; flp->name; flp++) { |
394 | if (uni.uni_flags & flp->f) { |
395 | putchar(' '); |
396 | fputs(flp->name, stdout); |
397 | } |
398 | } |
399 | putchar('\n'); |
400 | |
401 | /* --- Done --- */ |
402 | |
403 | return (run(av)); |
404 | } |
405 | |
406 | /* --- @cmd_ifname@ --- */ |
407 | |
408 | static int cmd_ifname(char **av) |
409 | { |
410 | struct unet_info uni; |
411 | |
412 | check(); |
413 | if (ioctl(fd, UNIOCGINFO, &uni) < 0) |
414 | die("couldn't read attachment information: %s", strerror(errno)); |
415 | puts(uni.uni_ifname); |
416 | return (run(av)); |
417 | } |
418 | |
419 | /* --- @cmd_protocol@ --- */ |
420 | |
421 | static int cmd_protocol(char **av) |
422 | { |
423 | const char *pn = *av++; |
424 | const struct eth_proto *ep; |
425 | |
426 | if ((ep = LOOKUP(eth_prototab, pn)) == 0) |
427 | die("unknown protocol name `%s'", pn); |
428 | |
429 | if (ep->proto == ETH_P_HELP) { |
430 | for (ep = eth_prototab; ep->name; ep++) { |
431 | if (ep->proto != ETH_P_HELP) |
432 | printf("%s -- %s\n", ep->name, ep->desc); |
433 | } |
434 | } else { |
435 | check(); |
436 | if (ioctl(fd, UNIOCSPROTO, ep->proto) < 0) |
437 | die("couldn't set protocol `%s': %s", ep->name, strerror(errno)); |
438 | whitter("set protocol `%s' for `%s'", ep->name, current); |
439 | } |
440 | |
441 | return (run(av)); |
442 | } |
443 | |
444 | /* --- @cmd_debug@ --- */ |
445 | |
446 | static int cmd_debug(char **av) |
447 | { |
448 | check(); |
449 | switch (ynq(*av++)) { |
450 | |
451 | case YNQ_QUERY: { |
452 | struct unet_info uni; |
453 | |
454 | if (ioctl(fd, UNIOCGINFO, &uni)) |
455 | die("error reading debug state: %s", strerror(errno)); |
456 | printf("debugging for `%s' is %s\n", current, |
457 | uni.uni_flags & UNIF_DEBUG ? "enabled" : "disabled"); |
458 | } break; |
459 | |
460 | case YNQ_YES: |
461 | if (ioctl(fd, UNIOCSDEBUG, 1) < 0) |
462 | die("error setting debug state: %s", strerror(errno)); |
463 | whitter("set debugging for `%s'", current); |
464 | break; |
465 | |
466 | case YNQ_NO: |
467 | if (ioctl(fd, UNIOCSDEBUG, 0) < 0) |
468 | die("error clearing debug state: %s", strerror(errno)); |
469 | whitter("cleared debugging for `%s'", current); |
470 | break; |
471 | } |
472 | |
473 | return (run(av)); |
474 | } |
475 | |
476 | /* --- @cmd_gdebug@ --- */ |
477 | |
478 | static int cmd_gdebug(char **av) |
479 | { |
480 | check(); |
481 | switch (ynq(*av++)) { |
482 | |
483 | case YNQ_QUERY: { |
484 | int i = ioctl(fd, UNIOCGGDEBUG); |
485 | if (i < 0) |
486 | die("error reading global debug state: %s", strerror(errno)); |
487 | else |
488 | printf("global debugging is %s\n", i ? "enabled" : "disabled"); |
489 | } break; |
490 | |
491 | case YNQ_YES: |
492 | if (ioctl(fd, UNIOCSGDEBUG, 1) < 0) |
493 | die("error setting global debug state: %s", strerror(errno)); |
494 | whitter("set global debugging"); |
495 | break; |
496 | |
497 | case YNQ_NO: |
498 | if (ioctl(fd, UNIOCSGDEBUG, 0) < 0) |
499 | die("error clearing global debug state: %s", strerror(errno)); |
500 | whitter("cleared global debugging"); |
501 | break; |
502 | } |
503 | |
504 | return (run(av)); |
505 | } |
506 | |
507 | /* --- @cmd_maxif@ --- */ |
508 | |
509 | static int cmd_maxif(char **av) |
510 | { |
511 | check(); |
512 | if (!*av) { |
513 | int i = ioctl(fd, UNIOCGMAXIF); |
514 | if (i < 0) |
515 | die("error reading maxif: %s", strerror(errno)); |
516 | else |
517 | printf("interface maximum is %d\n", i); |
518 | } else { |
519 | char *p = *av++, *q; |
520 | long i = strtol(p, &q, 0); |
521 | if (*q) |
522 | die("malformed integer: %s", p); |
523 | if (ioctl(fd, UNIOCSMAXIF, i)) |
524 | die("error setting maxif: %s", strerror(errno)); |
525 | } |
526 | |
527 | return (run(av)); |
528 | } |
529 | |
530 | /* --- @run@ --- * |
531 | * |
532 | * Arguments: @char **av@ = array of command line arguments |
533 | * |
534 | * Returns: Zero for success, nonzero for failure |
535 | * |
536 | * Use: Handles a sequence of commands. |
537 | */ |
538 | |
539 | static int run(char **av) |
540 | { |
541 | struct command *c; |
542 | int i; |
543 | |
544 | if (!*av) |
545 | return (EXIT_SUCCESS); |
546 | if ((c = LOOKUP(cmdtab, *av)) == 0) |
547 | c = &cmdtab[0]; |
548 | else |
549 | av++; |
550 | if (!c->func) |
551 | die("command `%s' not implemented", c->cmd); |
552 | for (i = 0; i < c->minarg; i++) { |
553 | if (!av[i]) |
554 | die("Usage: %s", c->syn); |
555 | } |
556 | return (c->func(av)); |
557 | } |
558 | |
559 | /* --- The command definition block --- */ |
560 | |
561 | static struct command cmdtab[] = { |
562 | |
563 | { "select", 1, cmd_select, |
564 | "[select] FILE", "select a Usernet device", "\ |
565 | Selects FILE as the current device. Each command acts only on the current\n\ |
566 | device. The word `select' may be omitted if desired.\n\ |
567 | " }, |
568 | |
569 | { |
570 | "fd", 1, cmd_fd, |
571 | "fd NUMBER", "select Usernet device from a file descriptor", "\ |
572 | Selects the file descriptor NUMBER as the current device. This allows\n\ |
573 | configuration of already existing transient attachments which would\n\ |
574 | otherwise be unnecessarily awkward.\n\ |
575 | " }, |
576 | |
577 | { "show", 0, cmd_show, |
578 | "show", "show status of device", "\ |
579 | Displays status information about the current device.\n\ |
580 | " }, |
581 | |
582 | { "ifname", 0, cmd_ifname, |
583 | "ifname", "print attached network interface name", "\ |
584 | Displays the name of the network interface attached to the current device.\n\ |
585 | This is useful in configuration scripts, for example.\n\ |
586 | " }, |
587 | |
588 | { "protocol", 1, cmd_protocol, |
589 | "protocol PROT", "selects PROT as the device's protocol", "\ |
590 | Sets PROT as the current device's protocol. All packets received by the\n\ |
591 | device are stamped with this protocol tag. To see a list of currently\n\ |
592 | known protocols, use the `help' protocol.\n\ |
593 | " }, |
594 | |
595 | { "debug", 1, cmd_debug, |
596 | "debug on|off|query", "set attachment debugging state", "\ |
597 | Set the current debugging state for the attachment. When debugging is\n\ |
598 | enabled, all packets flowing through the attachment are logged, along with\n\ |
599 | a large number of other informative messages. Note: the logs generated\n\ |
600 | tend to be very large, so don't flood the interface with data while\n\ |
601 | debugging is enabled!\n\ |
602 | " }, |
603 | |
604 | { "gdebug", 1, cmd_gdebug, |
605 | "gdebug on|off|query", "set global debugging state", "\ |
606 | Set the global debugging state for Usernet. This controls the emission\n\ |
607 | emission of various non-attachment-specific message. Also, new\n\ |
608 | attachments inherit their debug flags from the global flag.\n\ |
609 | " }, |
610 | |
611 | { "maxif", 0, cmd_maxif, |
612 | "maxif [MAX]", "set maximum number of interfaces allowed", "\ |
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613 | Configures the maximum number of interfaces allowed.\n\ |
4e3819cf |
614 | " }, |
615 | |
616 | { "help", 0, cmd_help, |
617 | "help [COMMAND]", "display help about COMMAND", "\ |
618 | If COMMAND is given, display help about it. If no COMAMND is specified,\n\ |
619 | provide general help.\n\ |
620 | " }, |
621 | |
622 | { 0, 0, 0, 0 } |
623 | }; |
624 | |
625 | /* --- Protocol description table --- */ |
626 | |
627 | static struct eth_proto eth_prototab[] = { |
628 | { "loop", ETH_P_LOOP, "Ethernet loopback" }, |
629 | { "echo", ETH_P_ECHO, "Ethernet echo" }, |
630 | { "pup", ETH_P_PUP, "Xerox PUP" }, |
631 | { "ip", ETH_P_IP, "Internet IP" }, |
632 | { "x25", ETH_P_X25, "CCITT X.25" }, |
633 | { "arp", ETH_P_ARP, "Address resolution protocol" }, |
634 | { "bpq", ETH_P_BPQ, "G8BPQ AX.25" }, |
635 | { "dec", ETH_P_DEC, "DEC assigned" }, |
636 | { "dna-dl", ETH_P_DNA_DL, "DEC DNA dump/load" }, |
637 | { "dna-rcon", ETH_P_DNA_RC, "DEC DNA remote console" }, |
638 | { "dna-route", ETH_P_DNA_RT, "DEC DNA routing" }, |
639 | { "lat", ETH_P_LAT, "DEC LAT" }, |
640 | { "diag", ETH_P_DIAG, "DEC diagnostics" }, |
641 | { "cust", ETH_P_CUST, "DEC customer user" }, |
642 | { "sca", ETH_P_SCA, "DEC Systems Comminications " |
643 | "Architecture" }, |
644 | { "rarp", ETH_P_RARP, "Reverse address resolution" }, |
645 | { "atalk", ETH_P_ATALK, "Appletalk DDP" }, |
646 | { "aarp", ETH_P_AARP, "Appletalk AARP" }, |
647 | { "ipx", ETH_P_IPX, "Novell IPX" }, |
648 | { "ipv6", ETH_P_IPV6, "Internet IPv6" }, |
649 | { "help", ETH_P_HELP, "<magical help token>" }, |
650 | { 0, 0, 0 } |
651 | }; |
652 | |
653 | /*----- Informative messages ----------------------------------------------*/ |
654 | |
655 | /* --- @usage@ --- * |
656 | * |
657 | * Arguments: @FILE *fp@ = stream to write on |
658 | * |
659 | * Returns: --- |
660 | * |
661 | * Use: Displays usage information for the program. |
662 | */ |
663 | |
664 | static void usage(FILE *fp) |
665 | { |
666 | fprintf(fp, "Usage: %s [-v] command ...\n", quis); |
667 | } |
668 | |
669 | /* --- @version@ --- * |
670 | * |
671 | * Arguments: --- |
672 | * |
673 | * Returns: --- |
674 | * |
675 | * Use: Displays the system's version number. |
676 | */ |
677 | |
678 | static void version(void) |
679 | { |
680 | printf("%s version %s\n", quis, VERSION); |
681 | } |
682 | |
683 | /* --- @help@ --- * |
684 | * |
685 | * Arguments: --- |
686 | * |
687 | * Returns: Doesn't |
688 | * |
689 | * Use: Displays some help and quits. |
690 | */ |
691 | |
692 | static void help(void) |
693 | { |
694 | struct command *c; |
695 | version(); |
696 | putchar('\n'); |
697 | usage(stdout); |
698 | putchar('\n'); |
699 | puts("Commands provided:\n"); |
700 | for (c = cmdtab; c->cmd; c++) |
701 | printf("%-30s%s\n", c->syn, c->shelp); |
702 | exit(0); |
703 | } |
704 | |
705 | /* --- @main@ --- * |
706 | * |
707 | * Arguments: @int argc@ = number of command line arguments received |
708 | * @char *argv[]@ = pointers to the command line arguments |
709 | * |
710 | * Returns: Zero for success, nonzero for failure |
711 | * |
712 | * Use: Dumps and manipulates Usernet attachments. |
713 | */ |
714 | |
715 | int main(int argc, char *argv[]) |
716 | { |
717 | /* --- Set the program name properly --- */ |
718 | |
719 | if (argc >= 1) { |
720 | if ((quis = strrchr(argv[0], '/')) == 0) |
721 | quis = argv[0]; |
722 | else |
723 | quis++; |
724 | } |
725 | |
726 | /* --- Now start parsing options --- */ |
727 | |
728 | for (;;) { |
729 | int i; |
730 | |
731 | static struct option opt[] = { |
732 | { "help", 0, 0, 'h' }, |
733 | { "usage", 0, 0, 'U' }, |
734 | { "version", 0, 0, 'V' }, |
735 | { "verbose", 0, 0, 'v' }, |
736 | { 0, 0, 0, 0 } |
737 | }; |
738 | |
739 | if ((i = getopt_long(argc, argv, "hVv", opt, 0)) < 0) |
740 | break; |
741 | switch (i) { |
742 | case 'h': |
743 | help(); |
744 | break; |
745 | case 'U': |
746 | usage(stdout); |
747 | exit(0); |
748 | break; |
749 | case 'V': |
750 | version(); |
751 | break; |
752 | case 'v': |
753 | flags |= f_verbose; |
754 | break; |
755 | default: |
756 | flags |= f_duff; |
757 | break; |
758 | } |
759 | } |
760 | |
761 | if (flags & f_duff) { |
762 | usage(stderr); |
763 | printf("(Type `%s --help' for more information.)\n", quis); |
764 | exit(EXIT_FAILURE); |
765 | } |
766 | |
767 | return (run(argv + optind)); |
768 | } |
769 | |
770 | /*----- That's all, folks -------------------------------------------------*/ |