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