xref: /dragonfly/usr.sbin/pppctl/pppctl.c (revision 19fe1c42) 
1 /*-
2  * Copyright (c) 1997 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: src/usr.sbin/pppctl/pppctl.c,v 1.21.2.2 2001/11/23 13:18:39 brian Exp $
27  * $DragonFly: src/usr.sbin/pppctl/pppctl.c,v 1.7 2006/01/14 22:58:18 corecode Exp $
28  */
29 
30 #include <sys/param.h>
31 
32 #include <sys/socket.h>
33 #include <netinet/in.h>
34 #include <arpa/inet.h>
35 #include <sys/un.h>
36 #include <netdb.h>
37 
38 #include <sys/time.h>
39 #include <err.h>
40 #include <errno.h>
41 #include <histedit.h>
42 #include <setjmp.h>
43 #include <signal.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <time.h>
48 #include <unistd.h>
49 
50 #define LINELEN 2048
51 static char Buffer[LINELEN], Command[LINELEN];
52 
53 static int
54 usage(void)
55 {
56     fprintf(stderr, "usage: pppctl [-v] [-t n] [-p passwd] "
57             "Port|LocalSock [command[;command]...]\n");
58     fprintf(stderr, "              -v tells pppctl to output all"
59             " conversation\n");
60     fprintf(stderr, "              -t n specifies a timeout of n"
61             " seconds when connecting (default 2)\n");
62     fprintf(stderr, "              -p passwd specifies your password\n");
63     exit(1);
64 }
65 
66 static int TimedOut = 0;
67 static void
68 Timeout(int Sig)
69 {
70     TimedOut = 1;
71 }
72 
73 #define REC_PASSWD  (1)
74 #define REC_SHOW    (2)
75 #define REC_VERBOSE (4)
76 
77 static char *passwd;
78 static char *prompt;
79 
80 static char *
81 GetPrompt(EditLine *e)
82 {
83     if (prompt == NULL)
84         prompt = "";
85     return prompt;
86 }
87 
88 static int
89 Receive(int fd, int display)
90 {
91     int Result;
92     int len;
93     char *last;
94 
95     prompt = Buffer;
96     len = 0;
97     while (Result = read(fd, Buffer+len, sizeof(Buffer)-len-1), Result != -1) {
98         if (Result == 0 && errno != EINTR) {
99           Result = -1;
100           break;
101         }
102         len += Result;
103         Buffer[len] = '\0';
104         if (len > 2 && !strcmp(Buffer+len-2, "> ")) {
105             prompt = strrchr(Buffer, '\n');
106             if (display & (REC_SHOW|REC_VERBOSE)) {
107                 if (display & REC_VERBOSE)
108                     last = Buffer+len-1;
109                 else
110                     last = prompt;
111                 if (last) {
112                     last++;
113                     write(1, Buffer, last-Buffer);
114                 }
115             }
116             prompt = prompt == NULL ? Buffer : prompt+1;
117             for (last = Buffer+len-2; last > Buffer && *last != ' '; last--)
118                 ;
119             if (last > Buffer+3 && !strncmp(last-3, " on", 3)) {
120                  /* a password is required ! */
121                  if (display & REC_PASSWD) {
122                     /* password time */
123                     if (!passwd)
124                         passwd = getpass("Password: ");
125                     sprintf(Buffer, "passwd %s\n", passwd);
126                     memset(passwd, '\0', strlen(passwd));
127                     if (display & REC_VERBOSE)
128                         write(1, Buffer, strlen(Buffer));
129                     write(fd, Buffer, strlen(Buffer));
130                     memset(Buffer, '\0', strlen(Buffer));
131                     return Receive(fd, display & ~REC_PASSWD);
132                 }
133                 Result = 1;
134             } else
135                 Result = 0;
136             break;
137         }
138         if (len == sizeof Buffer - 1) {
139             int flush;
140             if ((last = strrchr(Buffer, '\n')) == NULL)
141                 /* Yeuch - this is one mother of a line ! */
142                 flush = sizeof Buffer / 2;
143             else
144                 flush = last - Buffer + 1;
145             write(1, Buffer, flush);
146             strcpy(Buffer, Buffer + flush);
147             len -= flush;
148         }
149     }
150 
151     return Result;
152 }
153 
154 static int data = -1;
155 static jmp_buf pppdead;
156 
157 static void
158 check_fd(int sig)
159 {
160   if (data != -1) {
161     struct timeval t;
162     fd_set f;
163     static char buf[LINELEN];
164     int len;
165 
166     FD_ZERO(&f);
167     FD_SET(data, &f);
168     t.tv_sec = t.tv_usec = 0;
169     if (select(data+1, &f, NULL, NULL, &t) > 0) {
170       len = read(data, buf, sizeof buf);
171       if (len > 0)
172         write(1, buf, len);
173       else
174         longjmp(pppdead, -1);
175     }
176   }
177 }
178 
179 static const char *
180 smartgets(EditLine *e, int *count, int fd)
181 {
182   const char *result;
183 
184   data = fd;
185   signal(SIGALRM, check_fd);
186   ualarm(500000, 500000);
187   result = setjmp(pppdead) ? NULL : el_gets(e, count);
188   ualarm(0,0);
189   signal(SIGALRM, SIG_DFL);
190   data = -1;
191 
192   return result;
193 }
194 
195 int
196 main(int argc, char **argv)
197 {
198     struct servent *s;
199     struct hostent *h;
200     struct sockaddr *sock;
201     struct sockaddr_in ifsin;
202     struct sockaddr_un ifsun;
203     int n, socksz, arg, fd, len, verbose, save_errno, hide1, hide1off, hide2;
204     unsigned TimeoutVal;
205     char *DoneWord = "x", *next, *start;
206     struct sigaction act, oact;
207 
208     verbose = 0;
209     TimeoutVal = 2;
210     hide1 = hide1off = hide2 = 0;
211 
212     for (arg = 1; arg < argc; arg++)
213         if (*argv[arg] == '-') {
214             for (start = argv[arg] + 1; *start; start++)
215                 switch (*start) {
216                     case 't':
217                         TimeoutVal = (unsigned)atoi
218                             (start[1] ? start + 1 : argv[++arg]);
219                         start = DoneWord;
220                         break;
221 
222                     case 'v':
223                         verbose = REC_VERBOSE;
224                         break;
225 
226                     case 'p':
227                         if (start[1]) {
228                           hide1 = arg;
229                           hide1off = start - argv[arg];
230                           passwd = start + 1;
231                         } else {
232                           hide1 = arg;
233                           hide1off = start - argv[arg];
234                           passwd = argv[++arg];
235                           hide2 = arg;
236                         }
237                         start = DoneWord;
238                         break;
239 
240                     default:
241                         usage();
242                 }
243         }
244         else
245             break;
246 
247 
248     if (argc < arg + 1)
249         usage();
250 
251     if (hide1) {
252       char title[1024];
253       int pos, harg;
254 
255       for (harg = pos = 0; harg < argc; harg++)
256         if (harg == 0 || harg != hide2) {
257           if (harg == 0 || harg != hide1)
258             n = snprintf(title + pos, sizeof title - pos, "%s%s",
259                             harg ? " " : "", argv[harg]);
260           else if (hide1off > 1)
261             n = snprintf(title + pos, sizeof title - pos, " %.*s",
262                             hide1off, argv[harg]);
263           else
264             n = 0;
265           if (n < 0 || n >= sizeof title - pos)
266             break;
267           pos += n;
268         }
269 #ifdef __DragonFly__
270       setproctitle("-%s", title);
271 #else
272       setproctitle("%s", title);
273 #endif
274     }
275 
276     if (*argv[arg] == '/') {
277         sock = (struct sockaddr *)&ifsun;
278         socksz = sizeof ifsun;
279 
280         memset(&ifsun, '\0', sizeof ifsun);
281         ifsun.sun_len = strlen(argv[arg]);
282         if (ifsun.sun_len > sizeof ifsun.sun_path - 1) {
283             warnx("%s: path too long", argv[arg]);
284             return 1;
285         }
286         ifsun.sun_family = AF_LOCAL;
287         strcpy(ifsun.sun_path, argv[arg]);
288 
289         if (fd = socket(AF_LOCAL, SOCK_STREAM, 0), fd < 0) {
290             warnx("cannot create local domain socket");
291             return 2;
292         }
293     } else {
294         char *port, *host, *colon;
295         int hlen;
296 
297         colon = strchr(argv[arg], ':');
298         if (colon) {
299             port = colon + 1;
300             *colon = '\0';
301             host = argv[arg];
302         } else {
303             port = argv[arg];
304             host = "127.0.0.1";
305         }
306         sock = (struct sockaddr *)&ifsin;
307         socksz = sizeof ifsin;
308         hlen = strlen(host);
309 
310         memset(&ifsin, '\0', sizeof ifsin);
311         if (strspn(host, "0123456789.") == hlen) {
312             if (!inet_aton(host, &ifsin.sin_addr)) {
313                 warnx("cannot translate %s", host);
314                 return 1;
315             }
316         } else if ((h = gethostbyname(host)) == 0) {
317             warnx("cannot resolve %s", host);
318             return 1;
319         }
320         else
321             ifsin.sin_addr.s_addr = *(u_long *)h->h_addr_list[0];
322 
323         if (colon)
324             *colon = ':';
325 
326         if (strspn(port, "0123456789") == strlen(port))
327             ifsin.sin_port = htons(atoi(port));
328         else if (s = getservbyname(port, "tcp"), !s) {
329             warnx("%s isn't a valid port or service!", port);
330             usage();
331         }
332         else
333             ifsin.sin_port = s->s_port;
334 
335         ifsin.sin_len = sizeof(ifsin);
336         ifsin.sin_family = AF_INET;
337 
338         if (fd = socket(AF_INET, SOCK_STREAM, 0), fd < 0) {
339             warnx("cannot create internet socket");
340             return 2;
341         }
342     }
343 
344     TimedOut = 0;
345     if (TimeoutVal) {
346         act.sa_handler = Timeout;
347         sigemptyset(&act.sa_mask);
348         act.sa_flags = 0;
349         sigaction(SIGALRM, &act, &oact);
350         alarm(TimeoutVal);
351     }
352 
353     if (connect(fd, sock, socksz) < 0) {
354         if (TimeoutVal) {
355             save_errno = errno;
356             alarm(0);
357             sigaction(SIGALRM, &oact, 0);
358             errno = save_errno;
359         }
360         if (TimedOut)
361             warnx("timeout: cannot connect to socket %s", argv[arg]);
362         else {
363             if (errno)
364                 warn("cannot connect to socket %s", argv[arg]);
365             else
366                 warnx("cannot connect to socket %s", argv[arg]);
367         }
368         close(fd);
369         return 3;
370     }
371 
372     if (TimeoutVal) {
373         alarm(0);
374         sigaction(SIGALRM, &oact, 0);
375     }
376 
377     len = 0;
378     Command[sizeof(Command)-1] = '\0';
379     for (arg++; arg < argc; arg++) {
380         if (len && len < sizeof(Command)-1)
381             strcpy(Command+len++, " ");
382         strncpy(Command+len, argv[arg], sizeof(Command)-len-1);
383         len += strlen(Command+len);
384     }
385 
386     switch (Receive(fd, verbose | REC_PASSWD))
387     {
388         case 1:
389             fprintf(stderr, "Password incorrect\n");
390             break;
391 
392         case 0:
393             if (len == 0) {
394                 EditLine *edit;
395                 History *hist;
396 		HistEvent he;
397                 const char *l, *env;
398                 int size;
399 
400                 hist = history_init();
401                 if ((env = getenv("EL_SIZE"))) {
402                     size = atoi(env);
403                     if (size < 0)
404                       size = 20;
405                 } else
406                     size = 20;
407                 history(hist, &he, H_SETSIZE, size);
408                 edit = el_init("pppctl", stdin, stdout, stderr);
409                 el_source(edit, NULL);
410                 el_set(edit, EL_PROMPT, GetPrompt);
411                 if ((env = getenv("EL_EDITOR"))) {
412                     if (!strcmp(env, "vi"))
413                         el_set(edit, EL_EDITOR, "vi");
414                     else if (!strcmp(env, "emacs"))
415                         el_set(edit, EL_EDITOR, "emacs");
416                 }
417                 el_set(edit, EL_SIGNAL, 1);
418                 el_set(edit, EL_HIST, history, (const char *)hist);
419                 while ((l = smartgets(edit, &len, fd))) {
420                     if (len > 1)
421                         history(hist, &he, H_ENTER, l);
422                     write(fd, l, len);
423                     if (Receive(fd, REC_SHOW) != 0)
424                         break;
425                 }
426                 fprintf(stderr, "Connection closed\n");
427                 el_end(edit);
428                 history_end(hist);
429             } else {
430                 start = Command;
431                 do {
432                     next = strchr(start, ';');
433                     while (*start == ' ' || *start == '\t')
434                         start++;
435                     if (next)
436                         *next = '\0';
437                     strcpy(Buffer, start);
438                     Buffer[sizeof(Buffer)-2] = '\0';
439                     strcat(Buffer, "\n");
440                     if (verbose)
441                         write(1, Buffer, strlen(Buffer));
442                     write(fd, Buffer, strlen(Buffer));
443                     if (Receive(fd, verbose | REC_SHOW) != 0) {
444                         fprintf(stderr, "Connection closed\n");
445                         break;
446                     }
447                     if (next)
448                         start = ++next;
449                 } while (next && *next);
450                 if (verbose)
451                     puts("");
452             }
453             break;
454 
455         default:
456             warnx("ppp is not responding");
457             break;
458     }
459 
460     close(fd);
461 
462     return 0;
463 }
464