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 * $FreeBSD$ 27 */ 28 29 #include <sys/types.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 <semaphore.h> 42 #include <pthread.h> 43 #include <setjmp.h> 44 #include <signal.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <time.h> 49 #include <unistd.h> 50 51 #define LINELEN 2048 52 53 /* Data passed to the threads we create */ 54 struct thread_data { 55 EditLine *edit; /* libedit stuff */ 56 History *hist; /* libedit stuff */ 57 pthread_t trm; /* Terminal thread (for pthread_kill()) */ 58 int ppp; /* ppp descriptor */ 59 }; 60 61 /* Flags passed to Receive() */ 62 #define REC_PASSWD (1) /* Handle a password request from ppp */ 63 #define REC_SHOW (2) /* Show everything except prompts */ 64 #define REC_VERBOSE (4) /* Show everything */ 65 66 static char *passwd; 67 static char *prompt; /* Tell libedit what the current prompt is */ 68 static int data = -1; /* setjmp() has been done when data != -1 */ 69 static jmp_buf pppdead; /* Jump the Terminal thread out of el_gets() */ 70 static int timetogo; /* Tell the Monitor thread to exit */ 71 static sem_t sem_select; /* select() co-ordination between threads */ 72 static int TimedOut; /* Set if our connect() timed out */ 73 static int want_sem_post; /* Need to let the Monitor thread in ? */ 74 75 /* 76 * How to use pppctl... 77 */ 78 static int 79 usage() 80 { 81 fprintf(stderr, "usage: pppctl [-v] [-t n] [-p passwd] " 82 "Port|LocalSock [command[;command]...]\n"); 83 fprintf(stderr, " -v tells pppctl to output all" 84 " conversation\n"); 85 fprintf(stderr, " -t n specifies a timeout of n" 86 " seconds when connecting (default 2)\n"); 87 fprintf(stderr, " -p passwd specifies your password\n"); 88 exit(1); 89 } 90 91 /* 92 * Handle the SIGALRM received due to a connect() timeout. 93 */ 94 static void 95 Timeout(int Sig) 96 { 97 TimedOut = 1; 98 } 99 100 /* 101 * A callback routine for libedit to find out what the current prompt is. 102 * All the work is done in Receive() below. 103 */ 104 static char * 105 GetPrompt(EditLine *e) 106 { 107 if (prompt == NULL) 108 prompt = ""; 109 return prompt; 110 } 111 112 /* 113 * Receive data from the ppp descriptor. 114 * We also handle password prompts here (if asked via the `display' arg) 115 * and buffer what our prompt looks like (via the `prompt' global). 116 */ 117 static int 118 Receive(int fd, int display) 119 { 120 static char Buffer[LINELEN]; 121 struct timeval t; 122 int Result; 123 char *last; 124 fd_set f; 125 int len; 126 127 FD_ZERO(&f); 128 FD_SET(fd, &f); 129 t.tv_sec = 0; 130 t.tv_usec = 100000; 131 prompt = Buffer; 132 len = 0; 133 134 while (Result = read(fd, Buffer+len, sizeof(Buffer)-len-1), Result != -1) { 135 if (Result == 0 && errno != EINTR) { 136 Result = -1; 137 break; 138 } 139 len += Result; 140 Buffer[len] = '\0'; 141 if (len > 2 && !strcmp(Buffer+len-2, "> ")) { 142 prompt = strrchr(Buffer, '\n'); 143 if (display & (REC_SHOW|REC_VERBOSE)) { 144 if (display & REC_VERBOSE) 145 last = Buffer+len-1; 146 else 147 last = prompt; 148 if (last) { 149 last++; 150 write(1, Buffer, last-Buffer); 151 } 152 } 153 prompt = prompt == NULL ? Buffer : prompt+1; 154 for (last = Buffer+len-2; last > Buffer && *last != ' '; last--) 155 ; 156 if (last > Buffer+3 && !strncmp(last-3, " on", 3)) { 157 /* a password is required ! */ 158 if (display & REC_PASSWD) { 159 /* password time */ 160 if (!passwd) 161 passwd = getpass("Password: "); 162 sprintf(Buffer, "passwd %s\n", passwd); 163 memset(passwd, '\0', strlen(passwd)); 164 if (display & REC_VERBOSE) 165 write(1, Buffer, strlen(Buffer)); 166 write(fd, Buffer, strlen(Buffer)); 167 memset(Buffer, '\0', strlen(Buffer)); 168 return Receive(fd, display & ~REC_PASSWD); 169 } 170 Result = 1; 171 } else 172 Result = 0; 173 break; 174 } else 175 prompt = ""; 176 if (len == sizeof Buffer - 1) { 177 int flush; 178 if ((last = strrchr(Buffer, '\n')) == NULL) 179 /* Yeuch - this is one mother of a line ! */ 180 flush = sizeof Buffer / 2; 181 else 182 flush = last - Buffer + 1; 183 write(1, Buffer, flush); 184 strcpy(Buffer, Buffer + flush); 185 len -= flush; 186 } 187 if ((Result = select(fd + 1, &f, NULL, NULL, &t)) <= 0) { 188 if (len) 189 write(1, Buffer, len); 190 break; 191 } 192 } 193 194 return Result; 195 } 196 197 /* 198 * Handle being told by the Monitor thread that there's data to be read 199 * on the ppp descriptor. 200 * 201 * Note, this is a signal handler - be careful of what we do ! 202 */ 203 static void 204 InputHandler(int sig) 205 { 206 static char buf[LINELEN]; 207 struct timeval t; 208 int len; 209 fd_set f; 210 211 if (data != -1) { 212 FD_ZERO(&f); 213 FD_SET(data, &f); 214 t.tv_sec = t.tv_usec = 0; 215 216 if (select(data + 1, &f, NULL, NULL, &t) > 0) { 217 len = read(data, buf, sizeof buf); 218 219 if (len > 0) 220 write(1, buf, len); 221 else if (data != -1) 222 longjmp(pppdead, -1); 223 } 224 225 sem_post(&sem_select); 226 } else 227 /* Don't let the Monitor thread in 'till we've set ``data'' up again */ 228 want_sem_post = 1; 229 } 230 231 /* 232 * This is a simple wrapper for el_gets(), allowing our SIGUSR1 signal 233 * handler (above) to take effect only after we've done a setjmp(). 234 * 235 * We don't want it to do anything outside of here as we're going to 236 * service the ppp descriptor anyway. 237 */ 238 static const char * 239 SmartGets(EditLine *e, int *count, int fd) 240 { 241 const char *result; 242 243 if (setjmp(pppdead)) 244 result = NULL; 245 else { 246 data = fd; 247 if (want_sem_post) 248 /* Let the Monitor thread in again */ 249 sem_post(&sem_select); 250 result = el_gets(e, count); 251 } 252 253 data = -1; 254 255 return result; 256 } 257 258 /* 259 * The Terminal thread entry point. 260 * 261 * The bulk of the interactive work is done here. We read the terminal, 262 * write the results to our ppp descriptor and read the results back. 263 * 264 * While reading the terminal (using el_gets()), it's possible to take 265 * a SIGUSR1 from the Monitor thread, telling us that the ppp descriptor 266 * has some data. The data is read and displayed by the signal handler 267 * itself. 268 */ 269 static void * 270 Terminal(void *v) 271 { 272 struct sigaction act, oact; 273 struct thread_data *td; 274 const char *l; 275 int len; 276 277 act.sa_handler = InputHandler; 278 sigemptyset(&act.sa_mask); 279 act.sa_flags = SA_RESTART; 280 sigaction(SIGUSR1, &act, &oact); 281 282 td = (struct thread_data *)v; 283 want_sem_post = 1; 284 285 while ((l = SmartGets(td->edit, &len, td->ppp))) { 286 if (len > 1) 287 #ifdef __NetBSD__ 288 history(td->hist, NULL, H_ENTER, l); 289 #else 290 history(td->hist, H_ENTER, l); 291 #endif 292 write(td->ppp, l, len); 293 if (Receive(td->ppp, REC_SHOW) != 0) 294 break; 295 } 296 297 return NULL; 298 } 299 300 /* 301 * The Monitor thread entry point. 302 * 303 * This thread simply monitors our ppp descriptor. When there's something 304 * to read, a SIGUSR1 is sent to the Terminal thread. 305 * 306 * sem_select() is used by the Terminal thread to keep us from sending 307 * flurries of SIGUSR1s, and is used from the main thread to wake us up 308 * when it's time to exit. 309 */ 310 static void * 311 Monitor(void *v) 312 { 313 struct thread_data *td; 314 fd_set f; 315 int ret; 316 317 td = (struct thread_data *)v; 318 FD_ZERO(&f); 319 FD_SET(td->ppp, &f); 320 321 sem_wait(&sem_select); 322 while (!timetogo) 323 if ((ret = select(td->ppp + 1, &f, NULL, NULL, NULL)) > 0) { 324 pthread_kill(td->trm, SIGUSR1); 325 sem_wait(&sem_select); 326 } 327 328 return NULL; 329 } 330 331 /* 332 * Connect to ppp using either a local domain socket or a tcp socket. 333 * 334 * If we're given arguments, process them and quit, otherwise create two 335 * threads to handle interactive mode. 336 */ 337 int 338 main(int argc, char **argv) 339 { 340 struct servent *s; 341 struct hostent *h; 342 struct sockaddr *sock; 343 struct sockaddr_in ifsin; 344 struct sockaddr_un ifsun; 345 int socksz, arg, fd, len, verbose, save_errno, hide1, hide1off, hide2; 346 unsigned TimeoutVal; 347 char *DoneWord = "x", *next, *start; 348 struct sigaction act, oact; 349 void *thread_ret; 350 pthread_t mon; 351 char Command[LINELEN]; 352 char Buffer[LINELEN]; 353 354 verbose = 0; 355 TimeoutVal = 2; 356 hide1 = hide1off = hide2 = 0; 357 358 for (arg = 1; arg < argc; arg++) 359 if (*argv[arg] == '-') { 360 for (start = argv[arg] + 1; *start; start++) 361 switch (*start) { 362 case 't': 363 TimeoutVal = (unsigned)atoi 364 (start[1] ? start + 1 : argv[++arg]); 365 start = DoneWord; 366 break; 367 368 case 'v': 369 verbose = REC_VERBOSE; 370 break; 371 372 case 'p': 373 if (start[1]) { 374 hide1 = arg; 375 hide1off = start - argv[arg]; 376 passwd = start + 1; 377 } else { 378 hide1 = arg; 379 hide1off = start - argv[arg]; 380 passwd = argv[++arg]; 381 hide2 = arg; 382 } 383 start = DoneWord; 384 break; 385 386 default: 387 usage(); 388 } 389 } 390 else 391 break; 392 393 394 if (argc < arg + 1) 395 usage(); 396 397 if (hide1) { 398 char title[1024]; 399 int pos, harg; 400 401 for (harg = pos = 0; harg < argc; harg++) 402 if (harg == 0 || harg != hide2) { 403 if (harg == 0 || harg != hide1) 404 pos += snprintf(title + pos, sizeof title - pos, "%s%s", 405 harg ? " " : "", argv[harg]); 406 else if (hide1off > 1) 407 pos += snprintf(title + pos, sizeof title - pos, " %.*s", 408 hide1off, argv[harg]); 409 } 410 #ifdef __FreeBSD__ 411 setproctitle("-%s", title); 412 #else 413 setproctitle("%s", title); 414 #endif 415 } 416 417 if (*argv[arg] == '/') { 418 sock = (struct sockaddr *)&ifsun; 419 socksz = sizeof ifsun; 420 421 memset(&ifsun, '\0', sizeof ifsun); 422 ifsun.sun_len = strlen(argv[arg]); 423 if (ifsun.sun_len > sizeof ifsun.sun_path - 1) { 424 warnx("%s: path too long", argv[arg]); 425 return 1; 426 } 427 ifsun.sun_family = AF_LOCAL; 428 strcpy(ifsun.sun_path, argv[arg]); 429 430 if (fd = socket(AF_LOCAL, SOCK_STREAM, 0), fd < 0) { 431 warnx("cannot create local domain socket"); 432 return 2; 433 } 434 } else { 435 char *port, *host, *colon; 436 int hlen; 437 438 colon = strchr(argv[arg], ':'); 439 if (colon) { 440 port = colon + 1; 441 *colon = '\0'; 442 host = argv[arg]; 443 } else { 444 port = argv[arg]; 445 host = "127.0.0.1"; 446 } 447 sock = (struct sockaddr *)&ifsin; 448 socksz = sizeof ifsin; 449 hlen = strlen(host); 450 451 memset(&ifsin, '\0', sizeof ifsin); 452 if (strspn(host, "0123456789.") == hlen) { 453 if (!inet_aton(host, &ifsin.sin_addr)) { 454 warnx("cannot translate %s", host); 455 return 1; 456 } 457 } else if ((h = gethostbyname(host)) == 0) { 458 warnx("cannot resolve %s", host); 459 return 1; 460 } 461 else 462 ifsin.sin_addr.s_addr = *(u_long *)h->h_addr_list[0]; 463 464 if (colon) 465 *colon = ':'; 466 467 if (strspn(port, "0123456789") == strlen(port)) 468 ifsin.sin_port = htons(atoi(port)); 469 else if (s = getservbyname(port, "tcp"), !s) { 470 warnx("%s isn't a valid port or service!", port); 471 usage(); 472 } 473 else 474 ifsin.sin_port = s->s_port; 475 476 ifsin.sin_len = sizeof(ifsin); 477 ifsin.sin_family = AF_INET; 478 479 if (fd = socket(AF_INET, SOCK_STREAM, 0), fd < 0) { 480 warnx("cannot create internet socket"); 481 return 2; 482 } 483 } 484 485 TimedOut = 0; 486 if (TimeoutVal) { 487 act.sa_handler = Timeout; 488 sigemptyset(&act.sa_mask); 489 act.sa_flags = 0; 490 sigaction(SIGALRM, &act, &oact); 491 alarm(TimeoutVal); 492 } 493 494 if (connect(fd, sock, socksz) < 0) { 495 if (TimeoutVal) { 496 save_errno = errno; 497 alarm(0); 498 sigaction(SIGALRM, &oact, 0); 499 errno = save_errno; 500 } 501 if (TimedOut) 502 warnx("timeout: cannot connect to socket %s", argv[arg]); 503 else { 504 if (errno) 505 warn("cannot connect to socket %s", argv[arg]); 506 else 507 warnx("cannot connect to socket %s", argv[arg]); 508 } 509 close(fd); 510 return 3; 511 } 512 513 if (TimeoutVal) { 514 alarm(0); 515 sigaction(SIGALRM, &oact, 0); 516 } 517 518 len = 0; 519 Command[sizeof(Command)-1] = '\0'; 520 for (arg++; arg < argc; arg++) { 521 if (len && len < sizeof(Command)-1) 522 strcpy(Command+len++, " "); 523 strncpy(Command+len, argv[arg], sizeof(Command)-len-1); 524 len += strlen(Command+len); 525 } 526 527 switch (Receive(fd, verbose | REC_PASSWD)) { 528 case 1: 529 fprintf(stderr, "Password incorrect\n"); 530 break; 531 532 case 0: 533 passwd = NULL; 534 if (len == 0) { 535 struct thread_data td; 536 const char *env; 537 int size; 538 539 td.hist = history_init(); 540 if ((env = getenv("EL_SIZE"))) { 541 size = atoi(env); 542 if (size < 0) 543 size = 20; 544 } else 545 size = 20; 546 #ifdef __NetBSD__ 547 history(td.hist, NULL, H_SETSIZE, size); 548 td.edit = el_init("pppctl", stdin, stdout, stderr); 549 #else 550 history(td.hist, H_EVENT, size); 551 td.edit = el_init("pppctl", stdin, stdout); 552 #endif 553 el_source(td.edit, NULL); 554 el_set(td.edit, EL_PROMPT, GetPrompt); 555 if ((env = getenv("EL_EDITOR"))) { 556 if (!strcmp(env, "vi")) 557 el_set(td.edit, EL_EDITOR, "vi"); 558 else if (!strcmp(env, "emacs")) 559 el_set(td.edit, EL_EDITOR, "emacs"); 560 } 561 el_set(td.edit, EL_SIGNAL, 1); 562 el_set(td.edit, EL_HIST, history, (const char *)td.hist); 563 564 td.ppp = fd; 565 td.trm = NULL; 566 567 /* 568 * We create two threads. The Terminal thread does all the 569 * work while the Monitor thread simply tells the Terminal 570 * thread when ``fd'' becomes readable. The telling is done 571 * by sending a SIGUSR1 to the Terminal thread. The 572 * sem_select semaphore is used to prevent the monitor 573 * thread from firing excessive signals at the Terminal 574 * thread (it's abused for exit handling too - see below). 575 * 576 * The Terminal thread never uses td.trm ! 577 */ 578 sem_init(&sem_select, 0, 0); 579 580 pthread_create(&td.trm, NULL, Terminal, &td); 581 pthread_create(&mon, NULL, Monitor, &td); 582 583 /* Wait for the terminal thread to finish */ 584 pthread_join(td.trm, &thread_ret); 585 fprintf(stderr, "Connection closed\n"); 586 587 /* Get rid of the monitor thread by abusing sem_select */ 588 timetogo = 1; 589 close(fd); 590 fd = -1; 591 sem_post(&sem_select); 592 pthread_join(mon, &thread_ret); 593 594 /* Restore our terminal and release resources */ 595 el_end(td.edit); 596 history_end(td.hist); 597 sem_destroy(&sem_select); 598 } else { 599 start = Command; 600 do { 601 next = strchr(start, ';'); 602 while (*start == ' ' || *start == '\t') 603 start++; 604 if (next) 605 *next = '\0'; 606 strcpy(Buffer, start); 607 Buffer[sizeof(Buffer)-2] = '\0'; 608 strcat(Buffer, "\n"); 609 if (verbose) 610 write(1, Buffer, strlen(Buffer)); 611 write(fd, Buffer, strlen(Buffer)); 612 if (Receive(fd, verbose | REC_SHOW) != 0) { 613 fprintf(stderr, "Connection closed\n"); 614 break; 615 } 616 if (next) 617 start = ++next; 618 } while (next && *next); 619 if (verbose) 620 puts(""); 621 } 622 break; 623 624 default: 625 warnx("ppp is not responding"); 626 break; 627 } 628 629 if (fd != -1) 630 close(fd); 631 632 return 0; 633 } 634