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1
2 /*
3  * main.c
4  *
5  * Copyright (c) 1996-1999 Whistle Communications, Inc.
6  * All rights reserved.
7  * 
8  * Subject to the following obligations and disclaimer of warranty, use and
9  * redistribution of this software, in source or object code forms, with or
10  * without modifications are expressly permitted by Whistle Communications;
11  * provided, however, that:
12  * 1. Any and all reproductions of the source or object code must include the
13  *    copyright notice above and the following disclaimer of warranties; and
14  * 2. No rights are granted, in any manner or form, to use Whistle
15  *    Communications, Inc. trademarks, including the mark "WHISTLE
16  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
17  *    such appears in the above copyright notice or in the software.
18  * 
19  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
20  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
21  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
22  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
24  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
25  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
26  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
27  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
28  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
35  * OF SUCH DAMAGE.
36  *
37  * $FreeBSD$
38  * $Whistle: main.c,v 1.12 1999/11/29 19:17:46 archie Exp $
39  */
40
41 #include <sys/param.h>
42 #include <sys/socket.h>
43 #include <sys/select.h>
44
45 #include <ctype.h>
46 #include <err.h>
47 #include <errno.h>
48 #include <limits.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <sysexits.h>
53 #include <unistd.h>
54 #ifdef EDITLINE
55 #include <signal.h>
56 #include <histedit.h>
57 #include <pthread.h>
58 #endif
59
60 #include <netgraph.h>
61
62 #include "ngctl.h"
63
64 #define PROMPT                  "+ "
65 #define MAX_ARGS                512
66 #define WHITESPACE              " \t\r\n\v\f"
67 #define DUMP_BYTES_PER_LINE     16
68
69 /* Internal functions */
70 static int      ReadFile(FILE *fp);
71 static void     ReadSockets(fd_set *);
72 static int      DoParseCommand(const char *line);
73 static int      DoCommand(int ac, char **av);
74 static int      DoInteractive(void);
75 static const    struct ngcmd *FindCommand(const char *string);
76 static int      MatchCommand(const struct ngcmd *cmd, const char *s);
77 static void     Usage(const char *msg);
78 static int      ReadCmd(int ac, char **av);
79 static int      HelpCmd(int ac, char **av);
80 static int      QuitCmd(int ac, char **av);
81 #ifdef EDITLINE
82 static volatile sig_atomic_t unblock;
83 static pthread_mutex_t  mutex = PTHREAD_MUTEX_INITIALIZER;
84 static pthread_cond_t   cond = PTHREAD_COND_INITIALIZER;
85 #endif
86
87 /* List of commands */
88 static const struct ngcmd *const cmds[] = {
89         &config_cmd,
90         &connect_cmd,
91         &debug_cmd,
92         &dot_cmd,
93         &help_cmd,
94         &list_cmd,
95         &mkpeer_cmd,
96         &msg_cmd,
97         &name_cmd,
98         &read_cmd,
99         &rmhook_cmd,
100         &show_cmd,
101         &shutdown_cmd,
102         &status_cmd,
103         &types_cmd,
104         &write_cmd,
105         &quit_cmd,
106         NULL
107 };
108
109 /* Commands defined in this file */
110 const struct ngcmd read_cmd = {
111         ReadCmd,
112         "read <filename>",
113         "Read and execute commands from a file",
114         NULL,
115         { "source", "." }
116 };
117 const struct ngcmd help_cmd = {
118         HelpCmd,
119         "help [command]",
120         "Show command summary or get more help on a specific command",
121         NULL,
122         { "?" }
123 };
124 const struct ngcmd quit_cmd = {
125         QuitCmd,
126         "quit",
127         "Exit program",
128         NULL,
129         { "exit" }
130 };
131
132 /* Our control and data sockets */
133 int     csock, dsock;
134
135 /*
136  * main()
137  */
138 int
139 main(int ac, char *av[])
140 {
141         char    name[NG_NODESIZ];
142         int     interactive = isatty(0) && isatty(1);
143         FILE    *fp = NULL;
144         int     ch, rtn = 0;
145
146         /* Set default node name */
147         snprintf(name, sizeof(name), "ngctl%d", getpid());
148
149         /* Parse command line */
150         while ((ch = getopt(ac, av, "df:n:")) != -1) {
151                 switch (ch) {
152                 case 'd':
153                         NgSetDebug(NgSetDebug(-1) + 1);
154                         break;
155                 case 'f':
156                         if (strcmp(optarg, "-") == 0)
157                                 fp = stdin;
158                         else if ((fp = fopen(optarg, "r")) == NULL)
159                                 err(EX_NOINPUT, "%s", optarg);
160                         break;
161                 case 'n':
162                         snprintf(name, sizeof(name), "%s", optarg);
163                         break;
164                 case '?':
165                 default:
166                         Usage((char *)NULL);
167                         break;
168                 }
169         }
170         ac -= optind;
171         av += optind;
172
173         /* Create a new socket node */
174         if (NgMkSockNode(name, &csock, &dsock) < 0)
175                 err(EX_OSERR, "can't create node");
176
177         /* Do commands as requested */
178         if (ac == 0) {
179                 if (fp != NULL) {
180                         rtn = ReadFile(fp);
181                 } else if (interactive) {
182                         rtn = DoInteractive();
183                 } else
184                         Usage("no command specified");
185         } else {
186                 rtn = DoCommand(ac, av);
187         }
188
189         /* Convert command return code into system exit code */
190         switch (rtn) {
191         case CMDRTN_OK:
192         case CMDRTN_QUIT:
193                 rtn = 0;
194                 break;
195         case CMDRTN_USAGE:
196                 rtn = EX_USAGE;
197                 break;
198         case CMDRTN_ERROR:
199                 rtn = EX_OSERR;
200                 break;
201         }
202         return (rtn);
203 }
204
205 /*
206  * Process commands from a file
207  */
208 static int
209 ReadFile(FILE *fp)
210 {
211         char line[LINE_MAX];
212         int num, rtn;
213
214         for (num = 1; fgets(line, sizeof(line), fp) != NULL; num++) {
215                 if (*line == '#')
216                         continue;
217                 if ((rtn = DoParseCommand(line)) != 0) {
218                         warnx("line %d: error in file", num);
219                         return (rtn);
220                 }
221         }
222         return (CMDRTN_OK);
223 }
224
225 #ifdef EDITLINE
226 /* Signal handler for Monitor() thread. */
227 static void
228 Unblock(int signal)
229 {
230
231         unblock = 1;
232 }
233
234 /*
235  * Thread that monitors csock and dsock while main thread
236  * can be blocked in el_gets().
237  */
238 static void *
239 Monitor(void *v)
240 {
241         struct sigaction act;
242         const int maxfd = MAX(csock, dsock) + 1;
243
244         act.sa_handler = Unblock;
245         sigemptyset(&act.sa_mask);
246         act.sa_flags = 0;
247         sigaction(SIGUSR1, &act, NULL);
248
249         pthread_mutex_lock(&mutex);
250         for (;;) {
251                 fd_set rfds;
252
253                 /* See if any data or control messages are arriving. */
254                 FD_ZERO(&rfds);
255                 FD_SET(csock, &rfds);
256                 FD_SET(dsock, &rfds);
257                 unblock = 0;
258                 if (select(maxfd, &rfds, NULL, NULL, NULL) <= 0) {
259                         if (errno == EINTR) {
260                                 if (unblock == 1)
261                                         pthread_cond_wait(&cond, &mutex);
262                                 continue;
263                         }
264                         err(EX_OSERR, "select");
265                 }
266                 ReadSockets(&rfds);
267         }
268
269         return (NULL);
270 }
271
272 static char *
273 Prompt(EditLine *el)
274 {
275
276         return (PROMPT);
277 }
278
279 /*
280  * Here we start a thread, that will monitor the netgraph
281  * sockets and catch any unexpected messages or data on them,
282  * that can arrive while user edits his/her commands.
283  *
284  * Whenever we expect data on netgraph sockets, we send signal
285  * to monitoring thread. The signal forces it to exit select()
286  * system call and sleep on condvar until we wake it. While
287  * monitoring thread sleeps, we can do our work with netgraph
288  * sockets.
289  */
290 static int
291 DoInteractive(void)
292 {
293         pthread_t monitor;
294         EditLine *el;
295         History *hist;
296         HistEvent hev = { 0, "" };
297
298         (*help_cmd.func)(0, NULL);
299         pthread_create(&monitor, NULL, Monitor, NULL);
300         el = el_init(getprogname(), stdin, stdout, stderr);
301         if (el == NULL)
302                 return (CMDRTN_ERROR);
303         el_set(el, EL_PROMPT, Prompt);
304         el_set(el, EL_SIGNAL, 1);
305         el_set(el, EL_EDITOR, "emacs");
306         hist = history_init();
307         if (hist == NULL)
308                 return (CMDRTN_ERROR);
309         history(hist, &hev, H_SETSIZE, 100);
310         history(hist, &hev, H_SETUNIQUE, 1);
311         el_set(el, EL_HIST, history, (const char *)hist);
312         el_source(el, NULL);
313
314         for (;;) {
315                 const char *buf;
316                 int count;
317
318                 if ((buf = el_gets(el, &count)) == NULL) {
319                         printf("\n");
320                         break;
321                 }
322                 history(hist, &hev, H_ENTER, buf);
323                 pthread_kill(monitor, SIGUSR1);
324                 pthread_mutex_lock(&mutex);
325                 if (DoParseCommand(buf) == CMDRTN_QUIT)
326                         break;
327                 pthread_cond_signal(&cond);
328                 pthread_mutex_unlock(&mutex);
329         }
330
331         history_end(hist);
332         el_end(el);
333         pthread_cancel(monitor);
334
335         return (CMDRTN_QUIT);
336 }
337
338 #else /* !EDITLINE */
339
340 /*
341  * Interactive mode w/o libedit functionality.
342  */
343 static int
344 DoInteractive(void)
345 {
346         const int maxfd = MAX(csock, dsock) + 1;
347
348         (*help_cmd.func)(0, NULL);
349         while (1) {
350                 struct timeval tv;
351                 fd_set rfds;
352
353                 /* See if any data or control messages are arriving */
354                 FD_ZERO(&rfds);
355                 FD_SET(csock, &rfds);
356                 FD_SET(dsock, &rfds);
357                 memset(&tv, 0, sizeof(tv));
358                 if (select(maxfd, &rfds, NULL, NULL, &tv) <= 0) {
359
360                         /* Issue prompt and wait for anything to happen */
361                         printf("%s", PROMPT);
362                         fflush(stdout);
363                         FD_ZERO(&rfds);
364                         FD_SET(0, &rfds);
365                         FD_SET(csock, &rfds);
366                         FD_SET(dsock, &rfds);
367                         if (select(maxfd, &rfds, NULL, NULL, NULL) < 0)
368                                 err(EX_OSERR, "select");
369
370                         /* If not user input, print a newline first */
371                         if (!FD_ISSET(0, &rfds))
372                                 printf("\n");
373                 }
374
375                 ReadSockets(&rfds);
376
377                 /* Get any user input */
378                 if (FD_ISSET(0, &rfds)) {
379                         char buf[LINE_MAX];
380
381                         if (fgets(buf, sizeof(buf), stdin) == NULL) {
382                                 printf("\n");
383                                 break;
384                         }
385                         if (DoParseCommand(buf) == CMDRTN_QUIT)
386                                 break;
387                 }
388         }
389         return (CMDRTN_QUIT);
390 }
391 #endif /* !EDITLINE */
392
393 /*
394  * Read and process data on netgraph control and data sockets.
395  */
396 static void
397 ReadSockets(fd_set *rfds)
398 {
399         /* Display any incoming control message. */
400         if (FD_ISSET(csock, rfds))
401                 MsgRead();
402
403         /* Display any incoming data packet. */
404         if (FD_ISSET(dsock, rfds)) {
405                 char hook[NG_HOOKSIZ];
406                 u_char *buf;
407                 int rl;
408
409                 /* Read packet from socket. */
410                 if ((rl = NgAllocRecvData(dsock, &buf, hook)) < 0)
411                         err(EX_OSERR, "reading hook \"%s\"", hook);
412                 if (rl == 0)
413                         errx(EX_OSERR, "EOF from hook \"%s\"?", hook);
414
415                 /* Write packet to stdout. */
416                 printf("Rec'd data packet on hook \"%s\":\n", hook);
417                 DumpAscii(buf, rl);
418                 free(buf);
419         }
420 }
421
422 /*
423  * Parse a command line and execute the command
424  */
425 static int
426 DoParseCommand(const char *line)
427 {
428         char *av[MAX_ARGS];
429         int ac;
430
431         /* Parse line */
432         for (ac = 0, av[0] = strtok((char *)line, WHITESPACE);
433             ac < MAX_ARGS - 1 && av[ac];
434             av[++ac] = strtok(NULL, WHITESPACE));
435
436         /* Do command */
437         return (DoCommand(ac, av));
438 }
439
440 /*
441  * Execute the command
442  */
443 static int
444 DoCommand(int ac, char **av)
445 {
446         const struct ngcmd *cmd;
447         int rtn;
448
449         if (ac == 0 || *av[0] == 0)
450                 return (CMDRTN_OK);
451         if ((cmd = FindCommand(av[0])) == NULL)
452                 return (CMDRTN_ERROR);
453         if ((rtn = (*cmd->func)(ac, av)) == CMDRTN_USAGE)
454                 warnx("usage: %s", cmd->cmd);
455         return (rtn);
456 }
457
458 /*
459  * Find a command
460  */
461 static const struct ngcmd *
462 FindCommand(const char *string)
463 {
464         int k, found = -1;
465
466         for (k = 0; cmds[k] != NULL; k++) {
467                 if (MatchCommand(cmds[k], string)) {
468                         if (found != -1) {
469                                 warnx("\"%s\": ambiguous command", string);
470                                 return (NULL);
471                         }
472                         found = k;
473                 }
474         }
475         if (found == -1) {
476                 warnx("\"%s\": unknown command", string);
477                 return (NULL);
478         }
479         return (cmds[found]);
480 }
481
482 /*
483  * See if string matches a prefix of "cmd" (or an alias) case insensitively
484  */
485 static int
486 MatchCommand(const struct ngcmd *cmd, const char *s)
487 {
488         int a;
489
490         /* Try to match command, ignoring the usage stuff */
491         if (strlen(s) <= strcspn(cmd->cmd, WHITESPACE)) {
492                 if (strncasecmp(s, cmd->cmd, strlen(s)) == 0)
493                         return (1);
494         }
495
496         /* Try to match aliases */
497         for (a = 0; a < MAX_CMD_ALIAS && cmd->aliases[a] != NULL; a++) {
498                 if (strlen(cmd->aliases[a]) >= strlen(s)) {
499                         if (strncasecmp(s, cmd->aliases[a], strlen(s)) == 0)
500                                 return (1);
501                 }
502         }
503
504         /* No match */
505         return (0);
506 }
507
508 /*
509  * ReadCmd()
510  */
511 static int
512 ReadCmd(int ac, char **av)
513 {
514         FILE *fp;
515         int rtn;
516
517         /* Open file */
518         switch (ac) {
519         case 2:
520                 if ((fp = fopen(av[1], "r")) == NULL) {
521                         warn("%s", av[1]);
522                         return (CMDRTN_ERROR);
523                 }
524                 break;
525         default:
526                 return (CMDRTN_USAGE);
527         }
528
529         /* Process it */
530         rtn = ReadFile(fp);
531         fclose(fp);
532         return (rtn);
533 }
534
535 /*
536  * HelpCmd()
537  */
538 static int
539 HelpCmd(int ac, char **av)
540 {
541         const struct ngcmd *cmd;
542         int k;
543
544         switch (ac) {
545         case 0:
546         case 1:
547                 /* Show all commands */
548                 printf("Available commands:\n");
549                 for (k = 0; cmds[k] != NULL; k++) {
550                         char *s, buf[100];
551
552                         cmd = cmds[k];
553                         snprintf(buf, sizeof(buf), "%s", cmd->cmd);
554                         for (s = buf; *s != '\0' && !isspace(*s); s++);
555                         *s = '\0';
556                         printf("  %-10s %s\n", buf, cmd->desc);
557                 }
558                 return (CMDRTN_OK);
559         default:
560                 /* Show help on a specific command */
561                 if ((cmd = FindCommand(av[1])) != NULL) {
562                         printf("usage:    %s\n", cmd->cmd);
563                         if (cmd->aliases[0] != NULL) {
564                                 int a = 0;
565
566                                 printf("Aliases:  ");
567                                 while (1) {
568                                         printf("%s", cmd->aliases[a++]);
569                                         if (a == MAX_CMD_ALIAS
570                                             || cmd->aliases[a] == NULL) {
571                                                 printf("\n");
572                                                 break;
573                                         }
574                                         printf(", ");
575                                 }
576                         }
577                         printf("Summary:  %s\n", cmd->desc);
578                         if (cmd->help != NULL) {
579                                 const char *s;
580                                 char buf[65];
581                                 int tot, len, done;
582
583                                 printf("Description:\n");
584                                 for (s = cmd->help; *s != '\0'; s += len) {
585                                         while (isspace(*s))
586                                                 s++;
587                                         tot = snprintf(buf,
588                                             sizeof(buf), "%s", s);
589                                         len = strlen(buf);
590                                         done = len == tot;
591                                         if (!done) {
592                                                 while (len > 0
593                                                     && !isspace(buf[len-1]))
594                                                         buf[--len] = '\0';
595                                         }
596                                         printf("  %s\n", buf);
597                                 }
598                         }
599                 }
600         }
601         return (CMDRTN_OK);
602 }
603
604 /*
605  * QuitCmd()
606  */
607 static int
608 QuitCmd(int ac __unused, char **av __unused)
609 {
610         return (CMDRTN_QUIT);
611 }
612
613 /*
614  * Dump data in hex and ASCII form
615  */
616 void
617 DumpAscii(const u_char *buf, int len)
618 {
619         char ch, sbuf[100];
620         int k, count;
621
622         for (count = 0; count < len; count += DUMP_BYTES_PER_LINE) {
623                 snprintf(sbuf, sizeof(sbuf), "%04x:  ", count);
624                 for (k = 0; k < DUMP_BYTES_PER_LINE; k++) {
625                         if (count + k < len) {
626                                 snprintf(sbuf + strlen(sbuf),
627                                     sizeof(sbuf) - strlen(sbuf),
628                                     "%02x ", buf[count + k]);
629                         } else {
630                                 snprintf(sbuf + strlen(sbuf),
631                                     sizeof(sbuf) - strlen(sbuf), "   ");
632                         }
633                 }
634                 snprintf(sbuf + strlen(sbuf), sizeof(sbuf) - strlen(sbuf), " ");
635                 for (k = 0; k < DUMP_BYTES_PER_LINE; k++) {
636                         if (count + k < len) {
637                                 ch = isprint(buf[count + k]) ?
638                                     buf[count + k] : '.';
639                                 snprintf(sbuf + strlen(sbuf),
640                                     sizeof(sbuf) - strlen(sbuf), "%c", ch);
641                         } else {
642                                 snprintf(sbuf + strlen(sbuf),
643                                     sizeof(sbuf) - strlen(sbuf), " ");
644                         }
645                 }
646                 printf("%s\n", sbuf);
647         }
648 }
649
650 /*
651  * Usage()
652  */
653 static void
654 Usage(const char *msg)
655 {
656         if (msg)
657                 warnx("%s", msg);
658         fprintf(stderr,
659                 "usage: ngctl [-d] [-f file] [-n name] [command ...]\n");
660         exit(EX_USAGE);
661 }