usr.sbin/pppctl/pppctl.c

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