prompt.c revision 43313 
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 *	$Id: prompt.c,v 1.12 1998/08/26 17:39:37 brian Exp $
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/un.h>
34
35#include <errno.h>
36#include <stdarg.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <sys/fcntl.h>
41#include <termios.h>
42#include <unistd.h>
43
44#include "defs.h"
45#include "timer.h"
46#include "command.h"
47#include "log.h"
48#include "descriptor.h"
49#include "prompt.h"
50#include "fsm.h"
51#include "lcp.h"
52#include "auth.h"
53#include "iplist.h"
54#include "throughput.h"
55#include "slcompress.h"
56#include "mbuf.h"
57#include "lqr.h"
58#include "hdlc.h"
59#include "ipcp.h"
60#include "filter.h"
61#include "async.h"
62#include "ccp.h"
63#include "link.h"
64#include "physical.h"
65#include "mp.h"
66#ifndef NORADIUS
67#include "radius.h"
68#endif
69#include "bundle.h"
70#include "chat.h"
71#include "chap.h"
72#include "cbcp.h"
73#include "datalink.h"
74#include "server.h"
75#include "main.h"
76
77static void
78prompt_Display(struct prompt *p)
79{
80  /* XXX: See Index2Nam() - should we only figure this out once ? */
81  static char shostname[MAXHOSTNAMELEN];
82  const char *pconnect, *pauth;
83
84  if (p->TermMode || !p->needprompt)
85    return;
86
87  p->needprompt = 0;
88
89  if (p->nonewline)
90    p->nonewline = 0;
91  else
92    fprintf(p->Term, "\n");
93
94  if (p->auth == LOCAL_AUTH)
95    pauth = " ON ";
96  else
97    pauth = " on ";
98
99  if (p->bundle->ncp.ipcp.fsm.state == ST_OPENED)
100    pconnect = "PPP";
101  else if (bundle_Phase(p->bundle) == PHASE_NETWORK)
102    pconnect = "PPp";
103  else if (bundle_Phase(p->bundle) == PHASE_AUTHENTICATE)
104    pconnect = "Ppp";
105  else
106    pconnect = "ppp";
107
108  if (*shostname == '\0') {
109    char *dot;
110
111    if (gethostname(shostname, sizeof shostname))
112      strcpy(shostname, "localhost");
113    else if ((dot = strchr(shostname, '.')))
114      *dot = '\0';
115  }
116
117  fprintf(p->Term, "%s%s%s> ", pconnect, pauth, shostname);
118  fflush(p->Term);
119}
120
121static int
122prompt_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
123{
124  struct prompt *p = descriptor2prompt(d);
125  int sets;
126
127  sets = 0;
128
129  if (!p->active)
130    return sets;
131
132  if (p->fd_in >= 0) {
133    if (r) {
134      FD_SET(p->fd_in, r);
135      log_Printf(LogTIMER, "prompt %s: fdset(r) %d\n", p->src.from, p->fd_in);
136      sets++;
137    }
138    if (e) {
139      FD_SET(p->fd_in, e);
140      log_Printf(LogTIMER, "prompt %s: fdset(e) %d\n", p->src.from, p->fd_in);
141      sets++;
142    }
143    if (sets && *n < p->fd_in + 1)
144      *n = p->fd_in + 1;
145  }
146
147  prompt_Display(p);
148
149  return sets;
150}
151
152static int
153prompt_IsSet(struct descriptor *d, const fd_set *fdset)
154{
155  struct prompt *p = descriptor2prompt(d);
156  return p->fd_in >= 0 && FD_ISSET(p->fd_in, fdset);
157}
158
159
160static void
161prompt_ShowHelp(struct prompt *p)
162{
163  prompt_Printf(p, "The following commands are available:\n");
164  prompt_Printf(p, " ~p\tEnter Packet mode\n");
165  prompt_Printf(p, " ~t\tShow timers\n");
166  prompt_Printf(p, " ~m\tShow memory map\n");
167  prompt_Printf(p, " ~.\tTerminate program\n");
168  prompt_Printf(p, " ~?\tThis help\n");
169}
170
171static void
172prompt_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
173{
174  struct prompt *p = descriptor2prompt(d);
175  int n;
176  char ch;
177  char linebuff[LINE_LEN];
178
179  if (p->TermMode == NULL) {
180    n = read(p->fd_in, linebuff, sizeof linebuff - 1);
181    if (n > 0) {
182      if (linebuff[n-1] == '\n')
183        linebuff[--n] = '\0';
184      else
185        linebuff[n] = '\0';
186      p->nonewline = 1;		/* Maybe command_Decode does a prompt */
187      prompt_Required(p);
188      if (n)
189        command_Decode(bundle, linebuff, n, p, p->src.from);
190    } else if (n <= 0) {
191      log_Printf(LogPHASE, "%s: Client connection closed.\n", p->src.from);
192      if (!p->owner)
193        Cleanup(EX_NORMAL);
194      prompt_Destroy(p, 0);
195    }
196    return;
197  }
198
199  switch (p->TermMode->state) {
200    case DATALINK_CLOSED:
201      prompt_Printf(p, "Link lost, terminal mode.\n");
202      prompt_TtyCommandMode(p);
203      p->nonewline = 0;
204      prompt_Required(p);
205      return;
206
207    case DATALINK_READY:
208      break;
209
210    case DATALINK_OPEN:
211      prompt_Printf(p, "\nPacket mode detected.\n");
212      prompt_TtyCommandMode(p);
213      p->nonewline = 0;
214      /* We'll get a prompt because of our status change */
215      /* Fall through */
216
217    default:
218      /* Wait 'till we're in a state we care about */
219      return;
220  }
221
222  /*
223   * We are in terminal mode, decode special sequences
224   */
225  n = read(p->fd_in, &ch, 1);
226  log_Printf(LogDEBUG, "Got %d bytes (reading from the terminal)\n", n);
227
228  if (n > 0) {
229    switch (p->readtilde) {
230    case 0:
231      if (ch == '~')
232        p->readtilde = 1;
233      else
234	if (physical_Write(p->TermMode->physical, &ch, n) < 0) {
235	  log_Printf(LogWARN, "error writing to modem: %s\n", strerror(errno));
236          prompt_TtyCommandMode(p);
237        }
238      break;
239    case 1:
240      switch (ch) {
241      case '?':
242	prompt_ShowHelp(p);
243	break;
244      case 'p':
245        datalink_Up(p->TermMode, 0, 1);
246        prompt_Printf(p, "\nPacket mode.\n");
247	prompt_TtyCommandMode(p);
248        break;
249      case '.':
250	prompt_TtyCommandMode(p);
251        p->nonewline = 0;
252        prompt_Required(p);
253	break;
254      case 't':
255	timer_Show(0, p);
256	break;
257      case 'm':
258        {
259          struct cmdargs arg;
260
261          arg.cmdtab = NULL;
262          arg.cmd = NULL;
263          arg.argc = 0;
264          arg.argn = 0;
265          arg.argv = NULL;
266          arg.bundle = bundle;
267          arg.cx = p->TermMode;
268          arg.prompt = p;
269
270	  mbuf_Show(&arg);
271        }
272	break;
273      default:
274	if (physical_Write(p->TermMode->physical, &ch, n) < 0) {
275	  log_Printf(LogWARN, "error writing to modem: %s\n", strerror(errno));
276          prompt_TtyCommandMode(p);
277        }
278	break;
279      }
280      p->readtilde = 0;
281      break;
282    }
283  }
284}
285
286static int
287prompt_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
288{
289  /* We never want to write here ! */
290  log_Printf(LogALERT, "prompt_Write: Internal error: Bad call !\n");
291  return 0;
292}
293
294struct prompt *
295prompt_Create(struct server *s, struct bundle *bundle, int fd)
296{
297  struct prompt *p = (struct prompt *)malloc(sizeof(struct prompt));
298
299  if (p != NULL) {
300    p->desc.type = PROMPT_DESCRIPTOR;
301    p->desc.UpdateSet = prompt_UpdateSet;
302    p->desc.IsSet = prompt_IsSet;
303    p->desc.Read = prompt_Read;
304    p->desc.Write = prompt_Write;
305
306    if (fd == PROMPT_STD) {
307      char *tty = ttyname(STDIN_FILENO);
308
309      if (!tty) {
310        free(p);
311        return NULL;
312      }
313      p->fd_in = STDIN_FILENO;
314      p->fd_out = STDOUT_FILENO;
315      p->Term = stdout;
316      p->owner = NULL;
317      p->auth = LOCAL_AUTH;
318      p->src.type = "Controller";
319      strncpy(p->src.from, tty, sizeof p->src.from - 1);
320      p->src.from[sizeof p->src.from - 1] = '\0';
321      tcgetattr(p->fd_in, &p->oldtio);	/* Save original tty mode */
322    } else {
323      p->fd_in = p->fd_out = fd;
324      p->Term = fdopen(fd, "a+");
325      p->owner = s;
326      p->auth = *s->passwd ? LOCAL_NO_AUTH : LOCAL_AUTH;
327      p->src.type = "unknown";
328      *p->src.from = '\0';
329    }
330    p->TermMode = NULL;
331    p->nonewline = 1;
332    p->needprompt = 1;
333    p->readtilde = 0;
334    p->bundle = bundle;
335    log_RegisterPrompt(p);
336  }
337
338  return p;
339}
340
341void
342prompt_Destroy(struct prompt *p, int verbose)
343{
344  if (p) {
345    if (p->Term != stdout) {
346      fclose(p->Term);
347      close(p->fd_in);
348      if (p->fd_out != p->fd_in)
349        close(p->fd_out);
350      if (verbose)
351        log_Printf(LogPHASE, "%s: Client connection dropped.\n", p->src.from);
352    } else
353      prompt_TtyOldMode(p);
354
355    log_UnRegisterPrompt(p);
356    free(p);
357  }
358}
359
360void
361prompt_Printf(struct prompt *p, const char *fmt,...)
362{
363  if (p && p->active) {
364    va_list ap;
365
366    va_start(ap, fmt);
367    prompt_vPrintf(p, fmt, ap);
368    va_end(ap);
369  }
370}
371
372void
373prompt_vPrintf(struct prompt *p, const char *fmt, va_list ap)
374{
375  if (p && p->active) {
376    char nfmt[LINE_LEN];
377    const char *pfmt;
378
379    if (p->TermMode) {
380      /* Stuff '\r' in front of '\n' 'cos we're in raw mode */
381      int len = strlen(fmt);
382
383      if (len && len < sizeof nfmt - 1 && fmt[len-1] == '\n') {
384        strcpy(nfmt, fmt);
385        strcpy(nfmt + len - 1, "\r\n");
386        pfmt = nfmt;
387      } else
388        pfmt = fmt;
389    } else
390      pfmt = fmt;
391    vfprintf(p->Term, pfmt, ap);
392    fflush(p->Term);
393    p->nonewline = 1;
394  }
395}
396
397void
398prompt_TtyInit(struct prompt *p)
399{
400  int stat, fd = p ? p->fd_in : STDIN_FILENO;
401  struct termios newtio;
402
403  stat = fcntl(fd, F_GETFL, 0);
404  if (stat > 0) {
405    stat |= O_NONBLOCK;
406    fcntl(fd, F_SETFL, stat);
407  }
408
409  if (p)
410    newtio = p->oldtio;
411  else
412    tcgetattr(fd, &newtio);
413
414  newtio.c_lflag &= ~(ECHO | ISIG | ICANON);
415  newtio.c_iflag = 0;
416  newtio.c_oflag &= ~OPOST;
417  if (!p)
418    newtio.c_cc[VINTR] = _POSIX_VDISABLE;
419  newtio.c_cc[VMIN] = 1;
420  newtio.c_cc[VTIME] = 0;
421  newtio.c_cflag |= CS8;
422  tcsetattr(fd, TCSANOW, &newtio);
423  if (p)
424    p->comtio = newtio;
425}
426
427/*
428 *  Set tty into command mode. We allow canonical input and echo processing.
429 */
430void
431prompt_TtyCommandMode(struct prompt *p)
432{
433  struct termios newtio;
434  int stat;
435
436  tcgetattr(p->fd_in, &newtio);
437  newtio.c_lflag |= (ECHO | ISIG | ICANON);
438  newtio.c_iflag = p->oldtio.c_iflag;
439  newtio.c_oflag |= OPOST;
440  tcsetattr(p->fd_in, TCSADRAIN, &newtio);
441
442  stat = fcntl(p->fd_in, F_GETFL, 0);
443  if (stat > 0) {
444    stat |= O_NONBLOCK;
445    fcntl(p->fd_in, F_SETFL, stat);
446  }
447
448  p->TermMode = NULL;
449}
450
451/*
452 * Set tty into terminal mode which is used while we invoke term command.
453 */
454void
455prompt_TtyTermMode(struct prompt *p, struct datalink *dl)
456{
457  int stat;
458
459  if (p->Term == stdout)
460    tcsetattr(p->fd_in, TCSADRAIN, &p->comtio);
461
462  stat = fcntl(p->fd_in, F_GETFL, 0);
463  if (stat > 0) {
464    stat &= ~O_NONBLOCK;
465    fcntl(p->fd_in, F_SETFL, stat);
466  }
467  p->TermMode = dl;
468}
469
470void
471prompt_TtyOldMode(struct prompt *p)
472{
473  int stat;
474
475  stat = fcntl(p->fd_in, F_GETFL, 0);
476  if (stat > 0) {
477    stat &= ~O_NONBLOCK;
478    fcntl(p->fd_in, F_SETFL, stat);
479  }
480
481  if (p->Term == stdout)
482    tcsetattr(p->fd_in, TCSADRAIN, &p->oldtio);
483}
484
485pid_t
486prompt_pgrp(struct prompt *p)
487{
488  return tcgetpgrp(p->fd_in);
489}
490
491int
492PasswdCommand(struct cmdargs const *arg)
493{
494  const char *pass;
495
496  if (!arg->prompt) {
497    log_Printf(LogWARN, "passwd: Cannot specify without a prompt\n");
498    return 0;
499  }
500
501  if (arg->prompt->owner == NULL) {
502    log_Printf(LogWARN, "passwd: Not required\n");
503    return 0;
504  }
505
506  if (arg->argc == arg->argn)
507    pass = "";
508  else if (arg->argc > arg->argn+1)
509    return -1;
510  else
511    pass = arg->argv[arg->argn];
512
513  if (!strcmp(arg->prompt->owner->passwd, pass))
514    arg->prompt->auth = LOCAL_AUTH;
515  else
516    arg->prompt->auth = LOCAL_NO_AUTH;
517
518  return 0;
519}
520
521static struct pppTimer bgtimer;
522
523static void
524prompt_TimedContinue(void *v)
525{
526  prompt_Continue((struct prompt *)v);
527}
528
529void
530prompt_Continue(struct prompt *p)
531{
532  timer_Stop(&bgtimer);
533  if (getpgrp() == prompt_pgrp(p)) {
534    prompt_TtyCommandMode(p);
535    p->nonewline = 1;
536    prompt_Required(p);
537    log_ActivatePrompt(p);
538  } else if (!p->owner) {
539    bgtimer.func = prompt_TimedContinue;
540    bgtimer.name = "prompt bg";
541    bgtimer.load = SECTICKS;
542    bgtimer.arg = p;
543    timer_Start(&bgtimer);
544  }
545}
546
547void
548prompt_Suspend(struct prompt *p)
549{
550  if (getpgrp() == prompt_pgrp(p)) {
551    prompt_TtyOldMode(p);
552    log_DeactivatePrompt(p);
553  }
554}
555