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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  * $Whistle: main.c,v 1.12 1999/11/29 19:17:46 archie Exp $
38  */
39
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
42
43 #include <sys/param.h>
44 #include <sys/socket.h>
45 #include <sys/select.h>
46
47 #include <ctype.h>
48 #include <err.h>
49 #include <errno.h>
50 #include <limits.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <sysexits.h>
55 #include <unistd.h>
56 #ifdef EDITLINE
57 #include <signal.h>
58 #include <histedit.h>
59 #include <pthread.h>
60 #endif
61
62 #include <netgraph.h>
63
64 #include "ngctl.h"
65
66 #define PROMPT                  "+ "
67 #define MAX_ARGS                512
68 #define WHITESPACE              " \t\r\n\v\f"
69 #define DUMP_BYTES_PER_LINE     16
70
71 /* Internal functions */
72 static int      ReadFile(FILE *fp);
73 static void     ReadSockets(fd_set *);
74 static int      DoParseCommand(const char *line);
75 static int      DoCommand(int ac, char **av);
76 static int      DoInteractive(void);
77 static const    struct ngcmd *FindCommand(const char *string);
78 static int      MatchCommand(const struct ngcmd *cmd, const char *s);
79 static void     Usage(const char *msg);
80 static int      ReadCmd(int ac, char **av);
81 static int      HelpCmd(int ac, char **av);
82 static int      QuitCmd(int ac, char **av);
83 #ifdef EDITLINE
84 static volatile sig_atomic_t unblock;
85 static pthread_mutex_t  mutex = PTHREAD_MUTEX_INITIALIZER;
86 static pthread_cond_t   cond = PTHREAD_COND_INITIALIZER;
87 #endif
88
89 /* List of commands */
90 static const struct ngcmd *const cmds[] = {
91         &config_cmd,
92         &connect_cmd,
93         &debug_cmd,
94         &dot_cmd,
95         &help_cmd,
96         &list_cmd,
97         &mkpeer_cmd,
98         &msg_cmd,
99         &name_cmd,
100         &read_cmd,
101         &rmhook_cmd,
102         &show_cmd,
103         &shutdown_cmd,
104         &status_cmd,
105         &types_cmd,
106         &write_cmd,
107         &quit_cmd,
108         NULL
109 };
110
111 /* Commands defined in this file */
112 const struct ngcmd read_cmd = {
113         ReadCmd,
114         "read <filename>",
115         "Read and execute commands from a file",
116         NULL,
117         { "source", "." }
118 };
119 const struct ngcmd help_cmd = {
120         HelpCmd,
121         "help [command]",
122         "Show command summary or get more help on a specific command",
123         NULL,
124         { "?" }
125 };
126 const struct ngcmd quit_cmd = {
127         QuitCmd,
128         "quit",
129         "Exit program",
130         NULL,
131         { "exit" }
132 };
133
134 /* Our control and data sockets */
135 int     csock, dsock;
136
137 /*
138  * main()
139  */
140 int
141 main(int ac, char *av[])
142 {
143         char    name[NG_NODESIZ];
144         int     interactive = isatty(0) && isatty(1);
145         FILE    *fp = NULL;
146         int     ch, rtn = 0;
147
148         /* Set default node name */
149         snprintf(name, sizeof(name), "ngctl%d", getpid());
150
151         /* Parse command line */
152         while ((ch = getopt(ac, av, "df:n:")) != -1) {
153                 switch (ch) {
154                 case 'd':
155                         NgSetDebug(NgSetDebug(-1) + 1);
156                         break;
157                 case 'f':
158                         if (strcmp(optarg, "-") == 0)
159                                 fp = stdin;
160                         else if ((fp = fopen(optarg, "r")) == NULL)
161                                 err(EX_NOINPUT, "%s", optarg);
162                         break;
163                 case 'n':
164                         snprintf(name, sizeof(name), "%s", optarg);
165                         break;
166                 case '?':
167                 default:
168                         Usage((char *)NULL);
169                         break;
170                 }
171         }
172         ac -= optind;
173         av += optind;
174
175         /* Create a new socket node */
176         if (NgMkSockNode(name, &csock, &dsock) < 0)
177                 err(EX_OSERR, "can't create node");
178
179         /* Do commands as requested */
180         if (ac == 0) {
181                 if (fp != NULL) {
182                         rtn = ReadFile(fp);
183                 } else if (interactive) {
184                         rtn = DoInteractive();
185                 } else
186                         Usage("no command specified");
187         } else {
188                 rtn = DoCommand(ac, av);
189         }
190
191         /* Convert command return code into system exit code */
192         switch (rtn) {
193         case CMDRTN_OK:
194         case CMDRTN_QUIT:
195                 rtn = 0;
196                 break;
197         case CMDRTN_USAGE:
198                 rtn = EX_USAGE;
199                 break;
200         case CMDRTN_ERROR:
201                 rtn = EX_OSERR;
202                 break;
203         }
204         return (rtn);
205 }
206
207 /*
208  * Process commands from a file
209  */
210 static int
211 ReadFile(FILE *fp)
212 {
213         char line[LINE_MAX];
214         int num, rtn;
215
216         for (num = 1; fgets(line, sizeof(line), fp) != NULL; num++) {
217                 if (*line == '#')
218                         continue;
219                 if ((rtn = DoParseCommand(line)) != 0) {
220                         warnx("line %d: error in file", num);
221                         return (rtn);
222                 }
223         }
224         return (CMDRTN_OK);
225 }
226
227 #ifdef EDITLINE
228 /* Signal handler for Monitor() thread. */
229 static void
230 Unblock(int signal __unused)
231 {
232
233         unblock = 1;
234 }
235
236 /*
237  * Thread that monitors csock and dsock while main thread
238  * can be blocked in el_gets().
239  */
240 static void *
241 Monitor(void *v __unused)
242 {
243         struct sigaction act;
244         const int maxfd = MAX(csock, dsock) + 1;
245
246         act.sa_handler = Unblock;
247         sigemptyset(&act.sa_mask);
248         act.sa_flags = 0;
249         sigaction(SIGUSR1, &act, NULL);
250
251         pthread_mutex_lock(&mutex);
252         for (;;) {
253                 fd_set rfds;
254
255                 /* See if any data or control messages are arriving. */
256                 FD_ZERO(&rfds);
257                 FD_SET(csock, &rfds);
258                 FD_SET(dsock, &rfds);
259                 unblock = 0;
260                 if (select(maxfd, &rfds, NULL, NULL, NULL) <= 0) {
261                         if (errno == EINTR) {
262                                 if (unblock == 1)
263                                         pthread_cond_wait(&cond, &mutex);
264                                 continue;
265                         }
266                         err(EX_OSERR, "select");
267                 }
268                 ReadSockets(&rfds);
269         }
270
271         return (NULL);
272 }
273
274 static char *
275 Prompt(EditLine *el __unused)
276 {
277
278         return (PROMPT);
279 }
280
281 /*
282  * Here we start a thread, that will monitor the netgraph
283  * sockets and catch any unexpected messages or data on them,
284  * that can arrive while user edits his/her commands.
285  *
286  * Whenever we expect data on netgraph sockets, we send signal
287  * to monitoring thread. The signal forces it to exit select()
288  * system call and sleep on condvar until we wake it. While
289  * monitoring thread sleeps, we can do our work with netgraph
290  * sockets.
291  */
292 static int
293 DoInteractive(void)
294 {
295         pthread_t monitor;
296         EditLine *el;
297         History *hist;
298         HistEvent hev = { 0, "" };
299
300         (*help_cmd.func)(0, NULL);
301         pthread_create(&monitor, NULL, Monitor, NULL);
302         el = el_init(getprogname(), stdin, stdout, stderr);
303         if (el == NULL)
304                 return (CMDRTN_ERROR);
305         el_set(el, EL_PROMPT, Prompt);
306         el_set(el, EL_SIGNAL, 1);
307         el_set(el, EL_EDITOR, "emacs");
308         hist = history_init();
309         if (hist == NULL)
310                 return (CMDRTN_ERROR);
311         history(hist, &hev, H_SETSIZE, 100);
312         history(hist, &hev, H_SETUNIQUE, 1);
313         el_set(el, EL_HIST, history, (const char *)hist);
314         el_source(el, NULL);
315
316         for (;;) {
317                 const char *buf;
318                 int count;
319
320                 if ((buf = el_gets(el, &count)) == NULL) {
321                         printf("\n");
322                         break;
323                 }
324                 history(hist, &hev, H_ENTER, buf);
325                 pthread_kill(monitor, SIGUSR1);
326                 pthread_mutex_lock(&mutex);
327                 if (DoParseCommand(buf) == CMDRTN_QUIT)
328                         break;
329                 pthread_cond_signal(&cond);
330                 pthread_mutex_unlock(&mutex);
331         }
332
333         history_end(hist);
334         el_end(el);
335         pthread_cancel(monitor);
336
337         return (CMDRTN_QUIT);
338 }
339
340 #else /* !EDITLINE */
341
342 /*
343  * Interactive mode w/o libedit functionality.
344  */
345 static int
346 DoInteractive(void)
347 {
348         const int maxfd = MAX(csock, dsock) + 1;
349
350         (*help_cmd.func)(0, NULL);
351         while (1) {
352                 struct timeval tv;
353                 fd_set rfds;
354
355                 /* See if any data or control messages are arriving */
356                 FD_ZERO(&rfds);
357                 FD_SET(csock, &rfds);
358                 FD_SET(dsock, &rfds);
359                 memset(&tv, 0, sizeof(tv));
360                 if (select(maxfd, &rfds, NULL, NULL, &tv) <= 0) {
361
362                         /* Issue prompt and wait for anything to happen */
363                         printf("%s", PROMPT);
364                         fflush(stdout);
365                         FD_ZERO(&rfds);
366                         FD_SET(0, &rfds);
367                         FD_SET(csock, &rfds);
368                         FD_SET(dsock, &rfds);
369                         if (select(maxfd, &rfds, NULL, NULL, NULL) < 0)
370                                 err(EX_OSERR, "select");
371
372                         /* If not user input, print a newline first */
373                         if (!FD_ISSET(0, &rfds))
374                                 printf("\n");
375                 }
376
377                 ReadSockets(&rfds);
378
379                 /* Get any user input */
380                 if (FD_ISSET(0, &rfds)) {
381                         char buf[LINE_MAX];
382
383                         if (fgets(buf, sizeof(buf), stdin) == NULL) {
384                                 printf("\n");
385                                 break;
386                         }
387                         if (DoParseCommand(buf) == CMDRTN_QUIT)
388                                 break;
389                 }
390         }
391         return (CMDRTN_QUIT);
392 }
393 #endif /* !EDITLINE */
394
395 /*
396  * Read and process data on netgraph control and data sockets.
397  */
398 static void
399 ReadSockets(fd_set *rfds)
400 {
401         /* Display any incoming control message. */
402         if (FD_ISSET(csock, rfds))
403                 MsgRead();
404
405         /* Display any incoming data packet. */
406         if (FD_ISSET(dsock, rfds)) {
407                 char hook[NG_HOOKSIZ];
408                 u_char *buf;
409                 int rl;
410
411                 /* Read packet from socket. */
412                 if ((rl = NgAllocRecvData(dsock, &buf, hook)) < 0)
413                         err(EX_OSERR, "reading hook \"%s\"", hook);
414                 if (rl == 0)
415                         errx(EX_OSERR, "EOF from hook \"%s\"?", hook);
416
417                 /* Write packet to stdout. */
418                 printf("Rec'd data packet on hook \"%s\":\n", hook);
419                 DumpAscii(buf, rl);
420                 free(buf);
421         }
422 }
423
424 /*
425  * Parse a command line and execute the command
426  */
427 static int
428 DoParseCommand(const char *line)
429 {
430         char *av[MAX_ARGS];
431         int ac;
432
433         /* Parse line */
434         for (ac = 0, av[0] = strtok((char *)line, WHITESPACE);
435             ac < MAX_ARGS - 1 && av[ac];
436             av[++ac] = strtok(NULL, WHITESPACE));
437
438         /* Do command */
439         return (DoCommand(ac, av));
440 }
441
442 /*
443  * Execute the command
444  */
445 static int
446 DoCommand(int ac, char **av)
447 {
448         const struct ngcmd *cmd;
449         int rtn;
450
451         if (ac == 0 || *av[0] == 0)
452                 return (CMDRTN_OK);
453         if ((cmd = FindCommand(av[0])) == NULL)
454                 return (CMDRTN_ERROR);
455         if ((rtn = (*cmd->func)(ac, av)) == CMDRTN_USAGE)
456                 warnx("usage: %s", cmd->cmd);
457         return (rtn);
458 }
459
460 /*
461  * Find a command
462  */
463 static const struct ngcmd *
464 FindCommand(const char *string)
465 {
466         int k, found = -1;
467
468         for (k = 0; cmds[k] != NULL; k++) {
469                 if (MatchCommand(cmds[k], string)) {
470                         if (found != -1) {
471                                 warnx("\"%s\": ambiguous command", string);
472                                 return (NULL);
473                         }
474                         found = k;
475                 }
476         }
477         if (found == -1) {
478                 warnx("\"%s\": unknown command", string);
479                 return (NULL);
480         }
481         return (cmds[found]);
482 }
483
484 /*
485  * See if string matches a prefix of "cmd" (or an alias) case insensitively
486  */
487 static int
488 MatchCommand(const struct ngcmd *cmd, const char *s)
489 {
490         int a;
491
492         /* Try to match command, ignoring the usage stuff */
493         if (strlen(s) <= strcspn(cmd->cmd, WHITESPACE)) {
494                 if (strncasecmp(s, cmd->cmd, strlen(s)) == 0)
495                         return (1);
496         }
497
498         /* Try to match aliases */
499         for (a = 0; a < MAX_CMD_ALIAS && cmd->aliases[a] != NULL; a++) {
500                 if (strlen(cmd->aliases[a]) >= strlen(s)) {
501                         if (strncasecmp(s, cmd->aliases[a], strlen(s)) == 0)
502                                 return (1);
503                 }
504         }
505
506         /* No match */
507         return (0);
508 }
509
510 /*
511  * ReadCmd()
512  */
513 static int
514 ReadCmd(int ac, char **av)
515 {
516         FILE *fp;
517         int rtn;
518
519         /* Open file */
520         switch (ac) {
521         case 2:
522                 if ((fp = fopen(av[1], "r")) == NULL) {
523                         warn("%s", av[1]);
524                         return (CMDRTN_ERROR);
525                 }
526                 break;
527         default:
528                 return (CMDRTN_USAGE);
529         }
530
531         /* Process it */
532         rtn = ReadFile(fp);
533         fclose(fp);
534         return (rtn);
535 }
536
537 /*
538  * HelpCmd()
539  */
540 static int
541 HelpCmd(int ac, char **av)
542 {
543         const struct ngcmd *cmd;
544         int k;
545
546         switch (ac) {
547         case 0:
548         case 1:
549                 /* Show all commands */
550                 printf("Available commands:\n");
551                 for (k = 0; cmds[k] != NULL; k++) {
552                         char *s, buf[100];
553
554                         cmd = cmds[k];
555                         snprintf(buf, sizeof(buf), "%s", cmd->cmd);
556                         for (s = buf; *s != '\0' && !isspace(*s); s++);
557                         *s = '\0';
558                         printf("  %-10s %s\n", buf, cmd->desc);
559                 }
560                 return (CMDRTN_OK);
561         default:
562                 /* Show help on a specific command */
563                 if ((cmd = FindCommand(av[1])) != NULL) {
564                         printf("usage:    %s\n", cmd->cmd);
565                         if (cmd->aliases[0] != NULL) {
566                                 int a = 0;
567
568                                 printf("Aliases:  ");
569                                 while (1) {
570                                         printf("%s", cmd->aliases[a++]);
571                                         if (a == MAX_CMD_ALIAS
572                                             || cmd->aliases[a] == NULL) {
573                                                 printf("\n");
574                                                 break;
575                                         }
576                                         printf(", ");
577                                 }
578                         }
579                         printf("Summary:  %s\n", cmd->desc);
580                         if (cmd->help != NULL) {
581                                 const char *s;
582                                 char buf[65];
583                                 int tot, len, done;
584
585                                 printf("Description:\n");
586                                 for (s = cmd->help; *s != '\0'; s += len) {
587                                         while (isspace(*s))
588                                                 s++;
589                                         tot = snprintf(buf,
590                                             sizeof(buf), "%s", s);
591                                         len = strlen(buf);
592                                         done = len == tot;
593                                         if (!done) {
594                                                 while (len > 0
595                                                     && !isspace(buf[len-1]))
596                                                         buf[--len] = '\0';
597                                         }
598                                         printf("  %s\n", buf);
599                                 }
600                         }
601                 }
602         }
603         return (CMDRTN_OK);
604 }
605
606 /*
607  * QuitCmd()
608  */
609 static int
610 QuitCmd(int ac __unused, char **av __unused)
611 {
612         return (CMDRTN_QUIT);
613 }
614
615 /*
616  * Dump data in hex and ASCII form
617  */
618 void
619 DumpAscii(const u_char *buf, int len)
620 {
621         char ch, sbuf[100];
622         int k, count;
623
624         for (count = 0; count < len; count += DUMP_BYTES_PER_LINE) {
625                 snprintf(sbuf, sizeof(sbuf), "%04x:  ", count);
626                 for (k = 0; k < DUMP_BYTES_PER_LINE; k++) {
627                         if (count + k < len) {
628                                 snprintf(sbuf + strlen(sbuf),
629                                     sizeof(sbuf) - strlen(sbuf),
630                                     "%02x ", buf[count + k]);
631                         } else {
632                                 snprintf(sbuf + strlen(sbuf),
633                                     sizeof(sbuf) - strlen(sbuf), "   ");
634                         }
635                 }
636                 snprintf(sbuf + strlen(sbuf), sizeof(sbuf) - strlen(sbuf), " ");
637                 for (k = 0; k < DUMP_BYTES_PER_LINE; k++) {
638                         if (count + k < len) {
639                                 ch = isprint(buf[count + k]) ?
640                                     buf[count + k] : '.';
641                                 snprintf(sbuf + strlen(sbuf),
642                                     sizeof(sbuf) - strlen(sbuf), "%c", ch);
643                         } else {
644                                 snprintf(sbuf + strlen(sbuf),
645                                     sizeof(sbuf) - strlen(sbuf), " ");
646                         }
647                 }
648                 printf("%s\n", sbuf);
649         }
650 }
651
652 /*
653  * Usage()
654  */
655 static void
656 Usage(const char *msg)
657 {
658         if (msg)
659                 warnx("%s", msg);
660         fprintf(stderr,
661                 "usage: ngctl [-d] [-f file] [-n name] [command ...]\n");
662         exit(EX_USAGE);
663 }