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  * $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 }