xref: /freebsd/usr.sbin/ppp/prompt.c (revision 71fe318b852b8dfb3e799cb12ef184750f7f8eac) 
1 /*-
2  * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * $FreeBSD$
27  */
28 
29 #include <sys/param.h>
30 #include <netinet/in.h>
31 #include <netinet/in_systm.h>
32 #include <netinet/ip.h>
33 #include <sys/socket.h>
34 #include <sys/un.h>
35 
36 #include <errno.h>
37 #include <stdarg.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <sys/fcntl.h>
42 #include <termios.h>
43 #include <unistd.h>
44 
45 #include "layer.h"
46 #include "defs.h"
47 #include "timer.h"
48 #include "command.h"
49 #include "log.h"
50 #include "descriptor.h"
51 #include "prompt.h"
52 #include "fsm.h"
53 #include "auth.h"
54 #include "iplist.h"
55 #include "throughput.h"
56 #include "slcompress.h"
57 #include "mbuf.h"
58 #include "lqr.h"
59 #include "hdlc.h"
60 #include "lcp.h"
61 #include "ncpaddr.h"
62 #include "ipcp.h"
63 #include "filter.h"
64 #include "async.h"
65 #include "ccp.h"
66 #include "link.h"
67 #include "physical.h"
68 #include "mp.h"
69 #ifndef NORADIUS
70 #include "radius.h"
71 #endif
72 #include "ipv6cp.h"
73 #include "ncp.h"
74 #include "bundle.h"
75 #include "chat.h"
76 #include "chap.h"
77 #include "cbcp.h"
78 #include "datalink.h"
79 #include "server.h"
80 #include "main.h"
81 
82 static void
83 prompt_Display(struct prompt *p)
84 {
85   /* XXX: See Index2Nam() - should we only figure this out once ? */
86   static char shostname[MAXHOSTNAMELEN];
87   const char *pconnect, *pauth;
88 
89   if (p->TermMode || !p->needprompt)
90     return;
91 
92   p->needprompt = 0;
93 
94   if (p->nonewline)
95     p->nonewline = 0;
96   else
97     fprintf(p->Term, "\n");
98 
99   if (p->auth == LOCAL_AUTH)
100     pauth = " ON ";
101   else
102     pauth = " on ";
103 
104   if (p->bundle->ncp.ipcp.fsm.state == ST_OPENED)
105     pconnect = "PPP";
106   else if (bundle_Phase(p->bundle) == PHASE_NETWORK)
107     pconnect = "PPp";
108   else if (bundle_Phase(p->bundle) == PHASE_AUTHENTICATE)
109     pconnect = "Ppp";
110   else
111     pconnect = "ppp";
112 
113   if (*shostname == '\0') {
114     char *dot;
115 
116     if (gethostname(shostname, sizeof shostname) || *shostname == '\0')
117       strcpy(shostname, "localhost");
118     else if ((dot = strchr(shostname, '.')))
119       *dot = '\0';
120   }
121 
122   fprintf(p->Term, "%s%s%s> ", pconnect, pauth, shostname);
123   fflush(p->Term);
124 }
125 
126 static int
127 prompt_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
128 {
129   struct prompt *p = descriptor2prompt(d);
130   int sets;
131 
132   sets = 0;
133 
134   if (!p->active)
135     return sets;
136 
137   if (p->fd_in >= 0) {
138     if (r) {
139       FD_SET(p->fd_in, r);
140       log_Printf(LogTIMER, "prompt %s: fdset(r) %d\n", p->src.from, p->fd_in);
141       sets++;
142     }
143     if (e) {
144       FD_SET(p->fd_in, e);
145       log_Printf(LogTIMER, "prompt %s: fdset(e) %d\n", p->src.from, p->fd_in);
146       sets++;
147     }
148     if (sets && *n < p->fd_in + 1)
149       *n = p->fd_in + 1;
150   }
151 
152   prompt_Display(p);
153 
154   return sets;
155 }
156 
157 static int
158 prompt_IsSet(struct fdescriptor *d, const fd_set *fdset)
159 {
160   struct prompt *p = descriptor2prompt(d);
161   return p->fd_in >= 0 && FD_ISSET(p->fd_in, fdset);
162 }
163 
164 
165 static void
166 prompt_ShowHelp(struct prompt *p)
167 {
168   prompt_Printf(p, "The following commands are available:\n");
169   prompt_Printf(p, " ~p\tEnter Packet mode\n");
170   prompt_Printf(p, " ~t\tShow timers\n");
171   prompt_Printf(p, " ~m\tShow memory map\n");
172   prompt_Printf(p, " ~.\tTerminate program\n");
173   prompt_Printf(p, " ~?\tThis help\n");
174 }
175 
176 static void
177 prompt_Read(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset)
178 {
179   struct prompt *p = descriptor2prompt(d);
180   struct prompt *op;
181   int n;
182   char ch;
183   char linebuff[LINE_LEN];
184 
185   if (p->TermMode == NULL) {
186     n = read(p->fd_in, linebuff, sizeof linebuff - 1);
187     if (n > 0) {
188       if (linebuff[n-1] == '\n')
189         linebuff[--n] = '\0';
190       else
191         linebuff[n] = '\0';
192       p->nonewline = 1;		/* Maybe command_Decode does a prompt */
193       prompt_Required(p);
194       if (n) {
195         if ((op = log_PromptContext) == NULL)
196           log_PromptContext = p;
197         if (!command_Decode(bundle, linebuff, n, p, p->src.from))
198           prompt_Printf(p, "Syntax error\n");
199         log_PromptContext = op;
200       }
201     } else if (n <= 0) {
202       log_Printf(LogPHASE, "%s: Client connection closed.\n", p->src.from);
203       if (!p->owner)
204         Cleanup(EX_NORMAL);
205       prompt_Destroy(p, 0);
206     }
207     return;
208   }
209 
210   switch (p->TermMode->state) {
211     case DATALINK_CLOSED:
212       prompt_Printf(p, "Link lost, terminal mode.\n");
213       prompt_TtyCommandMode(p);
214       p->nonewline = 0;
215       prompt_Required(p);
216       return;
217 
218     case DATALINK_READY:
219       break;
220 
221     case DATALINK_OPEN:
222       prompt_Printf(p, "\nPacket mode detected.\n");
223       prompt_TtyCommandMode(p);
224       p->nonewline = 0;
225       /* We'll get a prompt because of our status change */
226       /* FALLTHROUGH */
227 
228     default:
229       /* Wait 'till we're in a state we care about */
230       return;
231   }
232 
233   /*
234    * We are in terminal mode, decode special sequences
235    */
236   n = read(p->fd_in, &ch, 1);
237   log_Printf(LogDEBUG, "Got %d bytes (reading from the terminal)\n", n);
238 
239   if (n > 0) {
240     switch (p->readtilde) {
241     case 0:
242       if (ch == '~')
243         p->readtilde = 1;
244       else
245 	if (physical_Write(p->TermMode->physical, &ch, n) < 0) {
246 	  log_Printf(LogWARN, "error writing to modem: %s\n", strerror(errno));
247           prompt_TtyCommandMode(p);
248         }
249       break;
250     case 1:
251       switch (ch) {
252       case '?':
253 	prompt_ShowHelp(p);
254 	break;
255       case 'p':
256         datalink_Up(p->TermMode, 0, 1);
257         prompt_Printf(p, "\nPacket mode.\n");
258 	prompt_TtyCommandMode(p);
259         break;
260       case '.':
261 	prompt_TtyCommandMode(p);
262         p->nonewline = 0;
263         prompt_Required(p);
264 	break;
265       case 't':
266 	timer_Show(0, p);
267 	break;
268       case 'm':
269         {
270           struct cmdargs arg;
271 
272           arg.cmdtab = NULL;
273           arg.cmd = NULL;
274           arg.argc = 0;
275           arg.argn = 0;
276           arg.argv = NULL;
277           arg.bundle = bundle;
278           arg.cx = p->TermMode;
279           arg.prompt = p;
280 
281 	  mbuf_Show(&arg);
282         }
283 	break;
284       default:
285 	if (physical_Write(p->TermMode->physical, &ch, n) < 0) {
286 	  log_Printf(LogWARN, "error writing to modem: %s\n", strerror(errno));
287           prompt_TtyCommandMode(p);
288         }
289 	break;
290       }
291       p->readtilde = 0;
292       break;
293     }
294   }
295 }
296 
297 static int
298 prompt_Write(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset)
299 {
300   /* We never want to write here ! */
301   log_Printf(LogALERT, "prompt_Write: Internal error: Bad call !\n");
302   return 0;
303 }
304 
305 struct prompt *
306 prompt_Create(struct server *s, struct bundle *bundle, int fd)
307 {
308   struct prompt *p = (struct prompt *)malloc(sizeof(struct prompt));
309 
310   if (p != NULL) {
311     p->desc.type = PROMPT_DESCRIPTOR;
312     p->desc.UpdateSet = prompt_UpdateSet;
313     p->desc.IsSet = prompt_IsSet;
314     p->desc.Read = prompt_Read;
315     p->desc.Write = prompt_Write;
316 
317     if (fd == PROMPT_STD) {
318       char *tty = ttyname(STDIN_FILENO);
319 
320       if (!tty) {
321         free(p);
322         return NULL;
323       }
324       p->fd_in = STDIN_FILENO;
325       p->fd_out = STDOUT_FILENO;
326       p->Term = stdout;
327       p->owner = NULL;
328       p->auth = LOCAL_AUTH;
329       p->src.type = "Controller";
330       strncpy(p->src.from, tty, sizeof p->src.from - 1);
331       p->src.from[sizeof p->src.from - 1] = '\0';
332       tcgetattr(p->fd_in, &p->oldtio);	/* Save original tty mode */
333     } else {
334       p->fd_in = p->fd_out = fd;
335       p->Term = fdopen(fd, "a+");
336       p->owner = s;
337       p->auth = *s->cfg.passwd ? LOCAL_NO_AUTH : LOCAL_AUTH;
338       p->src.type = "unknown";
339       *p->src.from = '\0';
340     }
341     p->TermMode = NULL;
342     p->nonewline = 1;
343     p->needprompt = 1;
344     p->readtilde = 0;
345     p->bundle = bundle;
346     log_RegisterPrompt(p);
347   }
348 
349   return p;
350 }
351 
352 void
353 prompt_Destroy(struct prompt *p, int verbose)
354 {
355   if (p) {
356     if (p->Term != stdout) {
357       fclose(p->Term);
358       close(p->fd_in);
359       if (p->fd_out != p->fd_in)
360         close(p->fd_out);
361       if (verbose)
362         log_Printf(LogPHASE, "%s: Client connection dropped.\n", p->src.from);
363     } else
364       prompt_TtyOldMode(p);
365 
366     log_UnRegisterPrompt(p);
367     free(p);
368   }
369 }
370 
371 void
372 prompt_Printf(struct prompt *p, const char *fmt,...)
373 {
374   if (p && p->active) {
375     va_list ap;
376 
377     va_start(ap, fmt);
378     prompt_vPrintf(p, fmt, ap);
379     va_end(ap);
380   }
381 }
382 
383 void
384 prompt_vPrintf(struct prompt *p, const char *fmt, va_list ap)
385 {
386   if (p && p->active) {
387     char nfmt[LINE_LEN];
388     const char *pfmt;
389 
390     if (p->TermMode) {
391       /* Stuff '\r' in front of '\n' 'cos we're in raw mode */
392       int len = strlen(fmt);
393 
394       if (len && len < sizeof nfmt - 1 && fmt[len-1] == '\n' &&
395           (len == 1 || fmt[len-2] != '\r')) {
396         strcpy(nfmt, fmt);
397         strcpy(nfmt + len - 1, "\r\n");
398         pfmt = nfmt;
399       } else
400         pfmt = fmt;
401     } else
402       pfmt = fmt;
403     vfprintf(p->Term, pfmt, ap);
404     fflush(p->Term);
405     p->nonewline = 1;
406   }
407 }
408 
409 void
410 prompt_TtyInit(struct prompt *p)
411 {
412   int stat, fd = p ? p->fd_in : STDIN_FILENO;
413   struct termios newtio;
414 
415   stat = fcntl(fd, F_GETFL, 0);
416   if (stat > 0) {
417     stat |= O_NONBLOCK;
418     fcntl(fd, F_SETFL, stat);
419   }
420 
421   if (p)
422     newtio = p->oldtio;
423   else
424     tcgetattr(fd, &newtio);
425 
426   newtio.c_lflag &= ~(ECHO | ISIG | ICANON);
427   newtio.c_iflag = 0;
428   newtio.c_oflag &= ~OPOST;
429   if (!p)
430     newtio.c_cc[VINTR] = _POSIX_VDISABLE;
431   newtio.c_cc[VMIN] = 1;
432   newtio.c_cc[VTIME] = 0;
433   newtio.c_cflag |= CS8;
434   tcsetattr(fd, TCSANOW, &newtio);
435   if (p)
436     p->comtio = newtio;
437 }
438 
439 /*
440  *  Set tty into command mode. We allow canonical input and echo processing.
441  */
442 void
443 prompt_TtyCommandMode(struct prompt *p)
444 {
445   struct termios newtio;
446   int stat;
447 
448   tcgetattr(p->fd_in, &newtio);
449   newtio.c_lflag |= (ECHO | ISIG | ICANON);
450   newtio.c_iflag = p->oldtio.c_iflag;
451   newtio.c_oflag |= OPOST;
452   tcsetattr(p->fd_in, TCSADRAIN, &newtio);
453 
454   stat = fcntl(p->fd_in, F_GETFL, 0);
455   if (stat > 0) {
456     stat |= O_NONBLOCK;
457     fcntl(p->fd_in, F_SETFL, stat);
458   }
459 
460   p->TermMode = NULL;
461 }
462 
463 /*
464  * Set tty into terminal mode which is used while we invoke term command.
465  */
466 void
467 prompt_TtyTermMode(struct prompt *p, struct datalink *dl)
468 {
469   int stat;
470 
471   if (p->Term == stdout)
472     tcsetattr(p->fd_in, TCSADRAIN, &p->comtio);
473 
474   stat = fcntl(p->fd_in, F_GETFL, 0);
475   if (stat > 0) {
476     stat &= ~O_NONBLOCK;
477     fcntl(p->fd_in, F_SETFL, stat);
478   }
479   p->TermMode = dl;
480 }
481 
482 void
483 prompt_TtyOldMode(struct prompt *p)
484 {
485   int stat;
486 
487   stat = fcntl(p->fd_in, F_GETFL, 0);
488   if (stat > 0) {
489     stat &= ~O_NONBLOCK;
490     fcntl(p->fd_in, F_SETFL, stat);
491   }
492 
493   if (p->Term == stdout)
494     tcsetattr(p->fd_in, TCSADRAIN, &p->oldtio);
495 }
496 
497 pid_t
498 prompt_pgrp(struct prompt *p)
499 {
500   return tcgetpgrp(p->fd_in);
501 }
502 
503 int
504 PasswdCommand(struct cmdargs const *arg)
505 {
506   const char *pass;
507 
508   if (!arg->prompt) {
509     log_Printf(LogWARN, "passwd: Cannot specify without a prompt\n");
510     return 0;
511   }
512 
513   if (arg->prompt->owner == NULL) {
514     log_Printf(LogWARN, "passwd: Not required\n");
515     return 0;
516   }
517 
518   if (arg->argc == arg->argn)
519     pass = "";
520   else if (arg->argc > arg->argn+1)
521     return -1;
522   else
523     pass = arg->argv[arg->argn];
524 
525   if (!strcmp(arg->prompt->owner->cfg.passwd, pass))
526     arg->prompt->auth = LOCAL_AUTH;
527   else
528     arg->prompt->auth = LOCAL_NO_AUTH;
529 
530   return 0;
531 }
532 
533 static struct pppTimer bgtimer;
534 
535 static void
536 prompt_TimedContinue(void *v)
537 {
538   prompt_Continue((struct prompt *)v);
539 }
540 
541 void
542 prompt_Continue(struct prompt *p)
543 {
544   timer_Stop(&bgtimer);
545   if (getpgrp() == prompt_pgrp(p)) {
546     prompt_TtyCommandMode(p);
547     p->nonewline = 1;
548     prompt_Required(p);
549     log_ActivatePrompt(p);
550   } else if (!p->owner) {
551     bgtimer.func = prompt_TimedContinue;
552     bgtimer.name = "prompt bg";
553     bgtimer.load = SECTICKS;
554     bgtimer.arg = p;
555     timer_Start(&bgtimer);
556   }
557 }
558 
559 void
560 prompt_Suspend(struct prompt *p)
561 {
562   if (getpgrp() == prompt_pgrp(p)) {
563     prompt_TtyOldMode(p);
564     log_DeactivatePrompt(p);
565   }
566 }
567