| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * A simple SLIP implementation drivable from the command-line |
| 4 | * |
| 5 | * (c) 2008 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Trivial IP Encryption (TrIPE). |
| 11 | * |
| 12 | * TrIPE is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * TrIPE is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with TrIPE; if not, write to the Free Software Foundation, |
| 24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | */ |
| 26 | |
| 27 | /*----- Header files ------------------------------------------------------*/ |
| 28 | |
| 29 | #include "config.h" |
| 30 | |
| 31 | #include <assert.h> |
| 32 | #include <ctype.h> |
| 33 | #include <errno.h> |
| 34 | #include <signal.h> |
| 35 | #include <stdio.h> |
| 36 | #include <stdlib.h> |
| 37 | #include <string.h> |
| 38 | |
| 39 | #include <sys/types.h> |
| 40 | #include <sys/time.h> |
| 41 | #include <unistd.h> |
| 42 | |
| 43 | #include <sys/socket.h> |
| 44 | #include <sys/un.h> |
| 45 | #include <netinet/in.h> |
| 46 | #include <arpa/inet.h> |
| 47 | #include <netdb.h> |
| 48 | |
| 49 | #include <mLib/alloc.h> |
| 50 | #include <mLib/bits.h> |
| 51 | #include <mLib/conn.h> |
| 52 | #include <mLib/dstr.h> |
| 53 | #include <mLib/fdflags.h> |
| 54 | #include <mLib/mdwopt.h> |
| 55 | #include <mLib/quis.h> |
| 56 | #include <mLib/report.h> |
| 57 | #include <mLib/sel.h> |
| 58 | #include <mLib/sub.h> |
| 59 | #include <mLib/tv.h> |
| 60 | |
| 61 | #include "slip.h" |
| 62 | |
| 63 | #undef sun |
| 64 | |
| 65 | /*----- Data structures ---------------------------------------------------*/ |
| 66 | |
| 67 | typedef struct pkq_node { |
| 68 | struct pkq_node *next; |
| 69 | unsigned char *buf; |
| 70 | size_t n, sz; |
| 71 | } pkq_node; |
| 72 | |
| 73 | typedef struct pkq { |
| 74 | pkq_node *head, **tail; |
| 75 | } pkq; |
| 76 | |
| 77 | enum { START, OK, ESC, BAD, SYNC1, SYNC2 }; |
| 78 | |
| 79 | typedef struct client { |
| 80 | sel_file f; |
| 81 | dstr d; |
| 82 | int mode; |
| 83 | } client; |
| 84 | |
| 85 | typedef struct gobbler { |
| 86 | sel_file f; |
| 87 | void (*done)(struct gobbler *, int, void *); |
| 88 | void *p; |
| 89 | } gobbler; |
| 90 | |
| 91 | typedef struct dribbler { |
| 92 | sel_file f; |
| 93 | pkq q; |
| 94 | void (*done)(struct dribbler *, int, void *); |
| 95 | void *p; |
| 96 | } dribbler; |
| 97 | |
| 98 | typedef struct waiter { |
| 99 | struct waiter *next; |
| 100 | int fd; |
| 101 | gobbler *g; |
| 102 | } waiter; |
| 103 | |
| 104 | /*----- Static variables --------------------------------------------------*/ |
| 105 | |
| 106 | static pkq q_in; |
| 107 | static dribbler *dribble_out; |
| 108 | static dstr slipbuf = DSTR_INIT; |
| 109 | static int slipstate = SYNC1; |
| 110 | static sel_file slip_in, listener; |
| 111 | static sel_state sel; |
| 112 | static unsigned reasons; |
| 113 | static waiter *wait_head, **wait_tail = &wait_head; |
| 114 | static unsigned char buf[16384]; |
| 115 | static const char *name; |
| 116 | |
| 117 | /*----- Utilities ---------------------------------------------------------*/ |
| 118 | |
| 119 | static void socketaddr(struct sockaddr_un *sun, size_t *sz) |
| 120 | { |
| 121 | size_t n = strlen(name) + 1; |
| 122 | if (n + offsetof(struct sockaddr_un, sun_path) > sizeof(*sun)) |
| 123 | die(EXIT_FAILURE, "name too long: `%s'", name); |
| 124 | sun->sun_family = AF_UNIX; |
| 125 | memcpy(sun->sun_path, name, n); |
| 126 | if (sz) |
| 127 | *sz = n + offsetof(struct sockaddr_un, sun_path); |
| 128 | } |
| 129 | |
| 130 | /*------ Packet queue -----------------------------------------------------* |
| 131 | * |
| 132 | * A packet queue contains a sequence of octet strings. Packets can be added |
| 133 | * to the end and read off the front. |
| 134 | */ |
| 135 | |
| 136 | static void initqueue(pkq *q) { q->head = 0; q->tail = &q->head; } |
| 137 | |
| 138 | static pkq_node *make_pkqnode(void *p, size_t n) |
| 139 | { |
| 140 | pkq_node *pn; |
| 141 | |
| 142 | if (!n) return (0); |
| 143 | pn = CREATE(pkq_node); |
| 144 | pn->next = 0; |
| 145 | pn->buf = xmalloc(n); |
| 146 | if (p) memcpy(pn->buf, p, n); |
| 147 | pn->sz = n; |
| 148 | pn->n = 0; |
| 149 | return (pn); |
| 150 | } |
| 151 | |
| 152 | static int enqueue(pkq *q, pkq_node *pn) |
| 153 | { |
| 154 | int rc = 0; |
| 155 | |
| 156 | if (!pn) return (0); |
| 157 | rc = !q->head; |
| 158 | pn->next = 0; |
| 159 | *q->tail = pn; |
| 160 | q->tail = &pn->next; |
| 161 | return (rc); |
| 162 | } |
| 163 | |
| 164 | static void destroy_pkqnode(pkq_node *pn) { xfree(pn->buf); DESTROY(pn); } |
| 165 | |
| 166 | static int dequeue(pkq *q, int freep) |
| 167 | { |
| 168 | pkq_node *pn = q->head; |
| 169 | assert(pn); |
| 170 | q->head = pn->next; |
| 171 | if (freep) |
| 172 | destroy_pkqnode(pn); |
| 173 | if (!q->head) { |
| 174 | q->tail = &q->head; |
| 175 | return (1); |
| 176 | } |
| 177 | return (0); |
| 178 | } |
| 179 | |
| 180 | static void destroy_pkq(pkq *q) |
| 181 | { |
| 182 | pkq_node *pn, *pnn; |
| 183 | |
| 184 | for (pn = q->head; pn; pn = pnn) { |
| 185 | pnn = pn->next; |
| 186 | destroy_pkqnode(pn); |
| 187 | } |
| 188 | q->head = 0; q->tail = &q->head; |
| 189 | } |
| 190 | |
| 191 | /*----- Gobblers ----------------------------------------------------------* |
| 192 | * |
| 193 | * A gobbler just eats everything it sees on its input descriptor. |
| 194 | * Eventually, when it sees end-of-file, it closes the input descriptor, |
| 195 | * calls a user-supplied calback function, and quits. |
| 196 | */ |
| 197 | |
| 198 | static void gobbler_close(gobbler *g) |
| 199 | { if (g->f.fd != -1) { sel_rmfile(&g->f); close(g->f.fd); g->f.fd = -1; } } |
| 200 | |
| 201 | static void gobbler_destroy(gobbler *g) { gobbler_close(g); DESTROY(g); } |
| 202 | |
| 203 | static void do_gobble_in(int fd, unsigned mode, void *p) |
| 204 | { |
| 205 | gobbler *g = p; |
| 206 | ssize_t n; |
| 207 | |
| 208 | for (;;) { |
| 209 | n = read(fd, buf, sizeof(buf)); |
| 210 | if (n < 0) { |
| 211 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) |
| 212 | break; |
| 213 | else { |
| 214 | moan("read (gobble): %s", strerror(errno)); |
| 215 | if (g->done) g->done(g, errno, g->p); |
| 216 | gobbler_close(g); |
| 217 | break; |
| 218 | } |
| 219 | } else if (n == 0) { |
| 220 | if (g->done) g->done(g, 0, g->p); |
| 221 | gobbler_close(g); |
| 222 | break; |
| 223 | } |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | static gobbler *make_gobbler(int fd, |
| 228 | void (*done)(gobbler *, int, void *), |
| 229 | void *p) |
| 230 | { |
| 231 | gobbler *g; |
| 232 | |
| 233 | g = CREATE(gobbler); |
| 234 | g->done = done; |
| 235 | g->p = p; |
| 236 | sel_initfile(&sel, &g->f, fd, SEL_READ, do_gobble_in, g); |
| 237 | sel_addfile(&g->f); |
| 238 | do_gobble_in(fd, SEL_READ, g); |
| 239 | return (g); |
| 240 | } |
| 241 | |
| 242 | /*----- Dribbler ----------------------------------------------------------* |
| 243 | * |
| 244 | * A dribbler hands out data from a packet queue to a file descriptor. It |
| 245 | * makes no attempt to preserve the record boundaries inherent in the packet |
| 246 | * queue structure. If the dribbler reaches the end of its queue, it invokes |
| 247 | * a user-supplied `done' function and stops selecting its output descriptor |
| 248 | * for writing. |
| 249 | */ |
| 250 | |
| 251 | static void cripple_dribbler(dribbler *d) { close(d->f.fd); d->f.fd = -1; } |
| 252 | |
| 253 | static void destroy_dribbler(dribbler *d) |
| 254 | { cripple_dribbler(d); DESTROY(d); } |
| 255 | |
| 256 | static void dribble_done(dribbler *d, int err) |
| 257 | { |
| 258 | if (d->q.head) { |
| 259 | sel_rmfile(&d->f); |
| 260 | destroy_pkq(&d->q); |
| 261 | } |
| 262 | d->done(d, err, d->p); |
| 263 | } |
| 264 | |
| 265 | static void do_dribble_out(int fd, unsigned mode, void *p) |
| 266 | { |
| 267 | dribbler *d = p; |
| 268 | ssize_t n; |
| 269 | pkq_node *pn; |
| 270 | |
| 271 | for (;;) { |
| 272 | pn = d->q.head; |
| 273 | n = write(fd, pn->buf + pn->n, pn->sz - pn->n); |
| 274 | if (n < 0) { |
| 275 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) |
| 276 | break; |
| 277 | else { |
| 278 | dribble_done(d, errno); |
| 279 | break; |
| 280 | } |
| 281 | } |
| 282 | pn->n += n; |
| 283 | if (pn->n == pn->sz && dequeue(&d->q, 1)) { |
| 284 | sel_rmfile(&d->f); |
| 285 | dribble_done(d, 0); |
| 286 | break; |
| 287 | } |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | static int enqueue_dribble(dribbler *d, pkq_node *pn) |
| 292 | { |
| 293 | if (d->f.fd == -1) { |
| 294 | destroy_pkqnode(pn); |
| 295 | return (0); |
| 296 | } |
| 297 | if (enqueue(&d->q, pn)) { |
| 298 | sel_addfile(&d->f); |
| 299 | do_dribble_out(d->f.fd, SEL_WRITE, d); |
| 300 | return (1); |
| 301 | } |
| 302 | return (0); |
| 303 | } |
| 304 | |
| 305 | static dribbler *make_dribbler(int fd, |
| 306 | void (*done)(dribbler *, int, void *), |
| 307 | void *p) |
| 308 | { |
| 309 | dribbler *d = CREATE(dribbler); |
| 310 | sel_initfile(&sel, &d->f, fd, SEL_WRITE, do_dribble_out, d); |
| 311 | initqueue(&d->q); |
| 312 | d->done = done; |
| 313 | d->p = p; |
| 314 | return (d); |
| 315 | } |
| 316 | |
| 317 | /*----- Clients -----------------------------------------------------------*/ |
| 318 | |
| 319 | static void done_client_dribble(dribbler *d, int err, void *p) |
| 320 | { |
| 321 | if (err) |
| 322 | moan("write (client): %s", strerror(err)); |
| 323 | gobbler_destroy(p); |
| 324 | destroy_dribbler(d); |
| 325 | reasons--; |
| 326 | } |
| 327 | |
| 328 | static void dequeue_to_waiter(void) |
| 329 | { |
| 330 | waiter *w; |
| 331 | dribbler *d; |
| 332 | pkq_node *pn; |
| 333 | |
| 334 | while (q_in.head && wait_head) { |
| 335 | w = wait_head; |
| 336 | wait_head = w->next; |
| 337 | if (!wait_head) |
| 338 | wait_tail = &wait_head; |
| 339 | d = make_dribbler(w->fd, done_client_dribble, w->g); |
| 340 | DESTROY(w); |
| 341 | pn = q_in.head; |
| 342 | if (dequeue(&q_in, 0)) |
| 343 | reasons--; |
| 344 | enqueue_dribble(d, pn); |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | static void client_destroy(client *c) |
| 349 | { |
| 350 | sel_rmfile(&c->f); |
| 351 | close(c->f.fd); |
| 352 | dstr_destroy(&c->d); |
| 353 | reasons--; |
| 354 | DESTROY(c); |
| 355 | } |
| 356 | |
| 357 | static void do_client_in(int fd, unsigned mode, void *p) |
| 358 | { |
| 359 | client *c = p; |
| 360 | ssize_t n, i, i0; |
| 361 | waiter *w; |
| 362 | |
| 363 | /* --- Attention --- * |
| 364 | * |
| 365 | * The queue for outbound packets is SLIP-encoded; we need to encode it |
| 366 | * here. The queue for inbound packets is raw. |
| 367 | */ |
| 368 | |
| 369 | for (;;) { |
| 370 | n = read(fd, buf, sizeof(buf)); |
| 371 | i0 = 0; |
| 372 | if (n < 0) { |
| 373 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) |
| 374 | break; |
| 375 | else { |
| 376 | moan("read (client): %s", strerror(errno)); |
| 377 | client_destroy(c); |
| 378 | return; |
| 379 | } |
| 380 | } else if (n == 0) { |
| 381 | if (c->mode == '>') { |
| 382 | DPUTC(&c->d, SL_END); |
| 383 | if (enqueue_dribble(dribble_out, make_pkqnode(c->d.buf, c->d.len))) |
| 384 | reasons++; |
| 385 | } |
| 386 | client_destroy(c); |
| 387 | return; |
| 388 | } |
| 389 | if (c->mode == '?') { |
| 390 | switch (buf[0]) { |
| 391 | case '>': |
| 392 | i0 = 1; |
| 393 | c->mode = '>'; |
| 394 | break; |
| 395 | case '<': |
| 396 | w = CREATE(waiter); |
| 397 | w->g = make_gobbler(fd, 0, 0); |
| 398 | w->next = 0; |
| 399 | w->fd = fd; |
| 400 | *wait_tail = w; |
| 401 | wait_tail = &w->next; |
| 402 | sel_rmfile(&c->f); |
| 403 | DESTROY(c); |
| 404 | dequeue_to_waiter(); |
| 405 | return; |
| 406 | default: |
| 407 | moan("bad client mode `%c'", buf[0]); |
| 408 | client_destroy(c); |
| 409 | return; |
| 410 | } |
| 411 | } |
| 412 | for (i = i0; i < n; i++) { |
| 413 | switch (buf[i]) { |
| 414 | case SL_ESC: |
| 415 | DPUTC(&c->d, SL_ESC); |
| 416 | DPUTC(&c->d, SL_ESCESC); |
| 417 | break; |
| 418 | case SL_END: |
| 419 | DPUTC(&c->d, SL_ESC); |
| 420 | DPUTC(&c->d, SL_ESCEND); |
| 421 | break; |
| 422 | default: |
| 423 | DPUTC(&c->d, buf[i]); |
| 424 | break; |
| 425 | } |
| 426 | } |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | static void do_accept(int fd, unsigned mode, void *hunoz) |
| 431 | { |
| 432 | client *c; |
| 433 | struct sockaddr_un sun; |
| 434 | socklen_t n = sizeof(sun); |
| 435 | int nfd; |
| 436 | |
| 437 | if ((nfd = accept(fd, (struct sockaddr *)&sun, &n)) < 0) { |
| 438 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) |
| 439 | return; |
| 440 | else |
| 441 | die(EXIT_FAILURE, "accept: %s", strerror(errno)); |
| 442 | } |
| 443 | c = CREATE(client); |
| 444 | c->mode = '?'; |
| 445 | dstr_create(&c->d); |
| 446 | fdflags(nfd, O_NONBLOCK, O_NONBLOCK, 0, 0); |
| 447 | sel_initfile(&sel, &c->f, nfd, SEL_READ, do_client_in, c); |
| 448 | sel_addfile(&c->f); |
| 449 | reasons++; |
| 450 | } |
| 451 | |
| 452 | /*----- Main daemon -------------------------------------------------------*/ |
| 453 | |
| 454 | static void done_slip_dribble(dribbler *d, int err, void *p) |
| 455 | { |
| 456 | if (!err) |
| 457 | reasons--; |
| 458 | else if (err != EPIPE) |
| 459 | die(EXIT_FAILURE, "write (slip): %s", strerror(errno)); |
| 460 | else |
| 461 | cripple_dribbler(d); |
| 462 | } |
| 463 | |
| 464 | static void do_slip_in(int fd, unsigned mode, void *hunoz) |
| 465 | { |
| 466 | ssize_t i, n; |
| 467 | |
| 468 | /* --- Attention --- * |
| 469 | * |
| 470 | * The queue for inbound packets contains raw data; we need to decode it |
| 471 | * here. The queue for outbound packets is SLIP-encoded. |
| 472 | * |
| 473 | * TrIPE sends two empty packets on start-up, in order to resynchronize the |
| 474 | * target. We don't need this and it messes us up. |
| 475 | */ |
| 476 | |
| 477 | for (;;) { |
| 478 | n = read(fd, buf, sizeof(buf)); |
| 479 | if (n == 0) { |
| 480 | switch (slipstate) { |
| 481 | case SYNC1: |
| 482 | case SYNC2: |
| 483 | case START: |
| 484 | case BAD: |
| 485 | break; |
| 486 | default: |
| 487 | moan("eof found while processing packet (discarding)"); |
| 488 | break; |
| 489 | } |
| 490 | close(fd); |
| 491 | sel_rmfile(&slip_in); |
| 492 | reasons--; |
| 493 | return; |
| 494 | } else if (n < 0) { |
| 495 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) |
| 496 | break; |
| 497 | die(EXIT_FAILURE, "read (slip in): %s", strerror(errno)); |
| 498 | } |
| 499 | for (i = 0; i < n; i++) { |
| 500 | switch (slipstate) { |
| 501 | case SYNC1: |
| 502 | switch (buf[i]) { |
| 503 | case SL_END: |
| 504 | slipstate = SYNC2; |
| 505 | break; |
| 506 | default: |
| 507 | goto start; |
| 508 | } |
| 509 | break; |
| 510 | case SYNC2: |
| 511 | switch (buf[i]) { |
| 512 | case SL_END: |
| 513 | slipstate = START; |
| 514 | break; |
| 515 | default: |
| 516 | goto start; |
| 517 | } |
| 518 | break; |
| 519 | case BAD: |
| 520 | switch (buf[i]) { |
| 521 | case SL_END: |
| 522 | DRESET(&slipbuf); |
| 523 | slipstate = OK; |
| 524 | break; |
| 525 | default: |
| 526 | break; |
| 527 | } |
| 528 | break; |
| 529 | case ESC: |
| 530 | switch (buf[i]) { |
| 531 | case SL_ESCEND: |
| 532 | DPUTC(&slipbuf, SL_END); |
| 533 | slipstate = OK; |
| 534 | break; |
| 535 | case SL_ESCESC: |
| 536 | DPUTC(&slipbuf, SL_ESC); |
| 537 | slipstate = OK; |
| 538 | break; |
| 539 | case SL_END: |
| 540 | moan("found escaped end byte (discard packet and resync"); |
| 541 | DRESET(&slipbuf); |
| 542 | slipstate = OK; |
| 543 | break; |
| 544 | default: |
| 545 | moan("unexpected escape char 0x%02x", buf[i]); |
| 546 | slipstate = BAD; |
| 547 | break; |
| 548 | } |
| 549 | break; |
| 550 | case START: |
| 551 | case OK: |
| 552 | start: |
| 553 | switch (buf[i]) { |
| 554 | case SL_ESC: |
| 555 | slipstate = ESC; |
| 556 | break; |
| 557 | case SL_END: |
| 558 | if (enqueue(&q_in, make_pkqnode(slipbuf.buf, slipbuf.len))) |
| 559 | reasons++; |
| 560 | DRESET(&slipbuf); |
| 561 | dequeue_to_waiter(); |
| 562 | slipstate = START; |
| 563 | break; |
| 564 | default: |
| 565 | DPUTC(&slipbuf, buf[i]); |
| 566 | slipstate = OK; |
| 567 | break; |
| 568 | } |
| 569 | break; |
| 570 | } |
| 571 | } |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | static void slipif(void) |
| 576 | { |
| 577 | int fd; |
| 578 | dstr d = DSTR_INIT; |
| 579 | struct sockaddr_un sun; |
| 580 | size_t sz; |
| 581 | |
| 582 | /* --- Make the socket --- */ |
| 583 | |
| 584 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
| 585 | die(EXIT_FAILURE, "socket: %s", strerror(errno)); |
| 586 | socketaddr(&sun, &sz); |
| 587 | if (bind(fd, (struct sockaddr *)&sun, sz)) |
| 588 | die(EXIT_FAILURE, "bind: %s", strerror(errno)); |
| 589 | if (listen(fd, 5)) |
| 590 | die(EXIT_FAILURE, "listen: %s", strerror(errno)); |
| 591 | |
| 592 | /* --- Set up listeners for things --- */ |
| 593 | |
| 594 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, 0, 0); |
| 595 | sel_initfile(&sel, &listener, fd, SEL_READ, do_accept, 0); |
| 596 | sel_addfile(&listener); |
| 597 | |
| 598 | fdflags(STDIN_FILENO, O_NONBLOCK, O_NONBLOCK, 0, 0); |
| 599 | fdflags(STDOUT_FILENO, O_NONBLOCK, O_NONBLOCK, 0, 0); |
| 600 | sel_initfile(&sel, &slip_in, STDIN_FILENO, SEL_READ, do_slip_in, 0); |
| 601 | dribble_out = make_dribbler(STDOUT_FILENO, done_slip_dribble, 0); |
| 602 | sel_addfile(&slip_in); |
| 603 | |
| 604 | initqueue(&q_in); |
| 605 | reasons++; |
| 606 | |
| 607 | /* --- Write the interface name --- */ |
| 608 | |
| 609 | dstr_putf(&d, "%s-%s\n", QUIS, name); |
| 610 | if (enqueue_dribble(dribble_out, make_pkqnode(d.buf, d.len))) |
| 611 | reasons++; |
| 612 | dstr_destroy(&d); |
| 613 | |
| 614 | /* --- Main loop --- */ |
| 615 | |
| 616 | while (reasons) { |
| 617 | if (sel_select(&sel)) |
| 618 | die(EXIT_FAILURE, "select: %s", strerror(errno)); |
| 619 | } |
| 620 | |
| 621 | /* --- Done --- */ |
| 622 | |
| 623 | unlink(name); |
| 624 | } |
| 625 | |
| 626 | /*----- Putting and getting -----------------------------------------------*/ |
| 627 | |
| 628 | static int make_sock(int mode) |
| 629 | { |
| 630 | struct sockaddr_un sun; |
| 631 | size_t sz; |
| 632 | int fd; |
| 633 | char ch; |
| 634 | |
| 635 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
| 636 | die(EXIT_FAILURE, "socket: %s", strerror(errno)); |
| 637 | socketaddr(&sun, &sz); |
| 638 | if (connect(fd, (struct sockaddr *)&sun, sz)) |
| 639 | die(EXIT_FAILURE, "connect: %s", strerror(errno)); |
| 640 | ch = mode; |
| 641 | if (write(fd, &ch, 1) < 0) |
| 642 | die(EXIT_FAILURE, "write (mode): %s", strerror(errno)); |
| 643 | return (fd); |
| 644 | } |
| 645 | |
| 646 | static void shovel(int from, int to) |
| 647 | { |
| 648 | ssize_t n; |
| 649 | size_t sz; |
| 650 | unsigned char *p; |
| 651 | |
| 652 | for (;;) { |
| 653 | n = read(from, buf, sizeof(buf)); |
| 654 | if (n < 0) { |
| 655 | if (errno == EINTR) |
| 656 | continue; |
| 657 | else |
| 658 | die(EXIT_FAILURE, "read (shovel): %s", strerror(errno)); |
| 659 | } else if (n == 0) |
| 660 | break; |
| 661 | |
| 662 | sz = n; |
| 663 | p = buf; |
| 664 | while (sz) { |
| 665 | n = write(to, p, sz); |
| 666 | if (n < 0) { |
| 667 | if (errno == EINTR) |
| 668 | continue; |
| 669 | else |
| 670 | die(EXIT_FAILURE, "write (shovel): %s", strerror(errno)); |
| 671 | } |
| 672 | p += n; |
| 673 | sz -= n; |
| 674 | } |
| 675 | } |
| 676 | close(from); |
| 677 | close(to); |
| 678 | } |
| 679 | |
| 680 | static void put(void) { shovel(STDIN_FILENO, make_sock('>')); } |
| 681 | static void get(void) { shovel(make_sock('<'), STDOUT_FILENO); } |
| 682 | |
| 683 | /*----- Flooding and sinking ----------------------------------------------*/ |
| 684 | |
| 685 | /* --- Connection jobs --- */ |
| 686 | |
| 687 | typedef struct conninfo { |
| 688 | struct conninfo *next; |
| 689 | conn c; |
| 690 | } conninfo; |
| 691 | |
| 692 | #define MAXCONN 32 |
| 693 | static conninfo conns[MAXCONN], *freeconns; |
| 694 | |
| 695 | static void (*connhook)(int, conninfo *); |
| 696 | |
| 697 | static void connrecycle(conninfo *c) { c->next = freeconns; freeconns = c; } |
| 698 | |
| 699 | static void connerr(conninfo *c) |
| 700 | { |
| 701 | if (errno == EAGAIN) connrecycle(c); |
| 702 | else die(EXIT_FAILURE, "connect: %s", strerror(errno)); |
| 703 | } |
| 704 | |
| 705 | static void connected(int fd, void *p) |
| 706 | { if (fd == -1) connerr(p); else connhook(fd, p); } |
| 707 | |
| 708 | static void conndoconnect(conninfo *c) |
| 709 | { |
| 710 | int fd; |
| 711 | struct sockaddr_un sun; |
| 712 | size_t sz; |
| 713 | |
| 714 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
| 715 | die(EXIT_FAILURE, "socket: %s", strerror(errno)); |
| 716 | socketaddr(&sun, &sz); |
| 717 | if (conn_init(&c->c, &sel, fd, (struct sockaddr *)&sun, sz, connected, c)) |
| 718 | connerr(c); |
| 719 | } |
| 720 | |
| 721 | static int timerflag; |
| 722 | |
| 723 | static void conndrip(struct timeval *tv, void *p) |
| 724 | { |
| 725 | conninfo *c, *cc; |
| 726 | |
| 727 | timerflag = 0; |
| 728 | while (freeconns) { |
| 729 | c = freeconns; freeconns = 0; |
| 730 | while (c) { cc = c->next; conndoconnect(c); c = cc; } |
| 731 | } |
| 732 | } |
| 733 | |
| 734 | static void connloop(void (*connected)(int, conninfo *)) |
| 735 | { |
| 736 | int i; |
| 737 | conninfo **cc; |
| 738 | sel_timer t; |
| 739 | struct timeval tv; |
| 740 | |
| 741 | connhook = connected; |
| 742 | for (i = 0, cc = &freeconns; i < MAXCONN; i++) { |
| 743 | *cc = &conns[i]; |
| 744 | cc = &conns[i].next; |
| 745 | } |
| 746 | *cc = 0; |
| 747 | |
| 748 | for (;;) { |
| 749 | if (freeconns && !timerflag) { |
| 750 | gettimeofday(&tv, 0); |
| 751 | TV_ADDL(&tv, &tv, 0, 10000); |
| 752 | sel_addtimer(&sel, &t, &tv, conndrip, 0); |
| 753 | timerflag = 1; |
| 754 | } |
| 755 | if (sel_select(&sel)) |
| 756 | die(EXIT_FAILURE, "select: %s", strerror(errno)); |
| 757 | } |
| 758 | } |
| 759 | |
| 760 | /* --- Sinking (glug glug) --- */ |
| 761 | |
| 762 | static void sink_close(gobbler *g, int err, void *p) |
| 763 | { |
| 764 | static char baton[4] = "/-\\|"; |
| 765 | static int pos = 0; |
| 766 | static int count = 0; |
| 767 | static int state = '?'; |
| 768 | |
| 769 | conninfo *c = p; |
| 770 | |
| 771 | if (!err) { |
| 772 | if (state == '?') |
| 773 | state = isatty(STDOUT_FILENO) ? 'y' : 'n'; |
| 774 | if (state == 'y') { |
| 775 | if (count) count--; |
| 776 | else { |
| 777 | putchar(baton[pos]); |
| 778 | putchar('\b'); |
| 779 | fflush(stdout); |
| 780 | pos++; |
| 781 | if (pos >= sizeof(baton)) pos = 0; |
| 782 | count = 128; |
| 783 | } |
| 784 | } |
| 785 | } |
| 786 | connrecycle(c); |
| 787 | } |
| 788 | |
| 789 | static void sink_connected(int fd, conninfo *c) |
| 790 | { |
| 791 | char dir = '<'; |
| 792 | |
| 793 | if (write(fd, &dir, 1) != 1) { |
| 794 | moan("write: %s (continuing)", strerror(errno)); |
| 795 | close(fd); |
| 796 | connrecycle(c); |
| 797 | return; |
| 798 | } |
| 799 | make_gobbler(fd, sink_close, c); |
| 800 | } |
| 801 | |
| 802 | static void sink(void) { connloop(sink_connected); } |
| 803 | |
| 804 | /* --- Flooding --- */ |
| 805 | |
| 806 | static void flood_close(dribbler *d, int err, void *p) |
| 807 | { |
| 808 | conninfo *c = p; |
| 809 | |
| 810 | if (err) moan("write: %s (continuing)\n", strerror(errno)); |
| 811 | destroy_dribbler(d); |
| 812 | connrecycle(c); |
| 813 | } |
| 814 | |
| 815 | static void flood_connected(int fd, conninfo *c) |
| 816 | { |
| 817 | static uint32 seq; |
| 818 | |
| 819 | dribbler *d; |
| 820 | pkq_node *pn; |
| 821 | int i; |
| 822 | |
| 823 | #define FLOOD_PKSZ 1024 |
| 824 | |
| 825 | pn = make_pkqnode(0, 1 + FLOOD_PKSZ); |
| 826 | pn->buf[0] = '>'; |
| 827 | STORE32(pn->buf + 1, seq); |
| 828 | for (i = 4; i < FLOOD_PKSZ; i++) |
| 829 | pn->buf[i + 1] = i & 0xff; |
| 830 | seq++; |
| 831 | d = make_dribbler(fd, flood_close, c); |
| 832 | enqueue_dribble(d, pn); |
| 833 | } |
| 834 | |
| 835 | static void flood(void) { connloop(flood_connected); } |
| 836 | |
| 837 | /*----- Main code ---------------------------------------------------------*/ |
| 838 | |
| 839 | static void usage(FILE *fp) { pquis(fp, "Usage: $ [-fgps] SOCKET\n"); } |
| 840 | |
| 841 | static void version(void) |
| 842 | { pquis(stdout, "$ (" PACKAGE " version " VERSION")\n"); } |
| 843 | |
| 844 | static void help(void) |
| 845 | { |
| 846 | version(); |
| 847 | fputc('\n', stdout); |
| 848 | usage(stdout); |
| 849 | puts("\n\ |
| 850 | With no options, provides a SLIP interface for TrIPE.\n\ |
| 851 | \n\ |
| 852 | Options:\n\ |
| 853 | -f, --flood Send packets to TrIPE as fast as possible.\n\ |
| 854 | -g, --get Receive packet from TrIPE and write to stdout.\n\ |
| 855 | -p, --put Send packet on stdin to TrIPE.\n\ |
| 856 | -s, --sink Slurp packets out of TrIPE and display progress."); |
| 857 | } |
| 858 | |
| 859 | int main(int argc, char *argv[]) |
| 860 | { |
| 861 | int mode = 'd'; |
| 862 | int i; |
| 863 | |
| 864 | ego(argv[0]); |
| 865 | for (;;) { |
| 866 | const struct option opt[] = { |
| 867 | { "help", 0, 0, 'h' }, |
| 868 | { "version", 0, 0, 'v' }, |
| 869 | { "put", 0, 0, 'p' }, |
| 870 | { "get", 0, 0, 'g' }, |
| 871 | { "flood", 0, 0, 'f' }, |
| 872 | { "sink", 0, 0, 's' }, |
| 873 | { 0, 0, 0, 0 } |
| 874 | }; |
| 875 | i = mdwopt(argc, argv, "hvpgfs", opt, 0, 0, 0); |
| 876 | if (i < 0) |
| 877 | break; |
| 878 | switch (i) { |
| 879 | case 'h': help(); return (0); |
| 880 | case 'v': version(); return (0); |
| 881 | case 'p': case 'g': case 's': case 'f': mode = i; break; |
| 882 | default: usage(stderr); exit(EXIT_FAILURE); break; |
| 883 | } |
| 884 | } |
| 885 | if (argc - optind != 1) { usage(stderr); exit(EXIT_FAILURE); } |
| 886 | name = argv[optind]; |
| 887 | signal(SIGPIPE, SIG_IGN); |
| 888 | switch (mode) { |
| 889 | case 'd': slipif(); break; |
| 890 | case 'p': put(); break; |
| 891 | case 'g': get(); break; |
| 892 | case 'f': flood(); break; |
| 893 | case 's': sink(); break; |
| 894 | } |
| 895 | return (0); |
| 896 | } |
| 897 | |
| 898 | /*----- That's all, folks -------------------------------------------------*/ |