| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Main daemon |
| 4 | * |
| 5 | * (c) 2012 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Yet Another Ident Daemon (YAID). |
| 11 | * |
| 12 | * YAID 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 | * YAID 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 YAID; 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 "yaid.h" |
| 30 | |
| 31 | /*----- Data structures ---------------------------------------------------*/ |
| 32 | |
| 33 | struct listen { |
| 34 | const struct addrops *ao; |
| 35 | sel_file f; |
| 36 | }; |
| 37 | |
| 38 | #define WRBUFSZ 1024 |
| 39 | struct writebuf { |
| 40 | size_t o, n; |
| 41 | sel_file wr; |
| 42 | void (*func)(int, void *); |
| 43 | void *p; |
| 44 | unsigned char buf[WRBUFSZ]; |
| 45 | }; |
| 46 | |
| 47 | struct proxy { |
| 48 | struct client *c; |
| 49 | int fd; |
| 50 | conn cn; |
| 51 | selbuf b; |
| 52 | struct writebuf wb; |
| 53 | char nat[ADDRLEN]; |
| 54 | }; |
| 55 | |
| 56 | struct client { |
| 57 | selbuf b; |
| 58 | int fd; |
| 59 | struct query q; |
| 60 | struct listen *l; |
| 61 | struct writebuf wb; |
| 62 | struct proxy *px; |
| 63 | }; |
| 64 | |
| 65 | /*----- Static variables --------------------------------------------------*/ |
| 66 | |
| 67 | static sel_state sel; |
| 68 | |
| 69 | static policy_v policy = DA_INIT; |
| 70 | static fwatch polfw; |
| 71 | |
| 72 | static unsigned char tokenbuf[4096]; |
| 73 | static size_t tokenptr = sizeof(tokenbuf); |
| 74 | static int randfd; |
| 75 | |
| 76 | /*----- Main code ---------------------------------------------------------*/ |
| 77 | |
| 78 | void logmsg(const struct query *q, int prio, const char *msg, ...) |
| 79 | { |
| 80 | va_list ap; |
| 81 | dstr d = DSTR_INIT; |
| 82 | |
| 83 | va_start(ap, msg); |
| 84 | if (q) { |
| 85 | dputsock(&d, q->ao, &q->s[L]); |
| 86 | dstr_puts(&d, " <-> "); |
| 87 | dputsock(&d, q->ao, &q->s[R]); |
| 88 | dstr_puts(&d, ": "); |
| 89 | } |
| 90 | dstr_vputf(&d, msg, &ap); |
| 91 | va_end(ap); |
| 92 | fprintf(stderr, "yaid: %s\n", d.buf); |
| 93 | dstr_destroy(&d); |
| 94 | } |
| 95 | |
| 96 | static void write_out(int fd, unsigned mode, void *p) |
| 97 | { |
| 98 | ssize_t n; |
| 99 | struct writebuf *wb = p; |
| 100 | |
| 101 | if ((n = write(fd, wb->buf + wb->o, wb->n)) < 0) { |
| 102 | if (errno == EAGAIN || errno == EWOULDBLOCK) return; |
| 103 | wb->n = 0; |
| 104 | sel_rmfile(&wb->wr); |
| 105 | wb->func(errno, wb->p); |
| 106 | } |
| 107 | wb->o += n; |
| 108 | wb->n -= n; |
| 109 | if (!wb->n) { |
| 110 | wb->o = 0; |
| 111 | sel_rmfile(&wb->wr); |
| 112 | wb->func(0, wb->p); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | static int queue_write(struct writebuf *wb, const void *p, size_t n) |
| 117 | { |
| 118 | if (!n) return (0); |
| 119 | if (wb->n - wb->o + n > WRBUFSZ) return (-1); |
| 120 | if (wb->o) { |
| 121 | memmove(wb->buf, wb->buf + wb->o, wb->n); |
| 122 | wb->o = 0; |
| 123 | } |
| 124 | memcpy(wb->buf + wb->n, p, n); |
| 125 | if (!wb->n) { |
| 126 | sel_addfile(&wb->wr); |
| 127 | sel_force(&wb->wr); |
| 128 | } |
| 129 | wb->n += n; |
| 130 | return (0); |
| 131 | } |
| 132 | |
| 133 | static void free_writebuf(struct writebuf *wb) |
| 134 | { if (wb->n) sel_rmfile(&wb->wr); } |
| 135 | |
| 136 | static void init_writebuf(struct writebuf *wb, |
| 137 | int fd, void (*func)(int, void *), void *p) |
| 138 | { |
| 139 | sel_initfile(&sel, &wb->wr, fd, SEL_WRITE, write_out, wb); |
| 140 | wb->func = func; |
| 141 | wb->p = p; |
| 142 | wb->n = wb->o = 0; |
| 143 | } |
| 144 | |
| 145 | static void cancel_proxy(struct proxy *px) |
| 146 | { |
| 147 | if (px->fd == -1) |
| 148 | conn_kill(&px->cn); |
| 149 | else { |
| 150 | close(px->fd); |
| 151 | selbuf_destroy(&px->b); |
| 152 | free_writebuf(&px->wb); |
| 153 | } |
| 154 | selbuf_enable(&px->c->b); |
| 155 | px->c->px = 0; |
| 156 | xfree(px); |
| 157 | } |
| 158 | |
| 159 | static void disconnect_client(struct client *c) |
| 160 | { |
| 161 | close(c->fd); |
| 162 | selbuf_destroy(&c->b); |
| 163 | free_writebuf(&c->wb); |
| 164 | if (c->px) cancel_proxy(c->px); |
| 165 | xfree(c); |
| 166 | } |
| 167 | |
| 168 | static int fix_up_socket(int fd, const char *what) |
| 169 | { |
| 170 | int yes = 1; |
| 171 | |
| 172 | if (fdflags(fd, O_NONBLOCK, O_NONBLOCK, 0, 0)) { |
| 173 | logmsg(0, LOG_ERR, "failed to set %s connection nonblocking: %s", |
| 174 | what, strerror(errno)); |
| 175 | return (-1); |
| 176 | } |
| 177 | |
| 178 | if (setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &yes, sizeof(yes))) { |
| 179 | logmsg(0, LOG_ERR, |
| 180 | "failed to disable `out-of-band' data on %s connection: %s", |
| 181 | what, strerror(errno)); |
| 182 | return (-1); |
| 183 | } |
| 184 | |
| 185 | return (0); |
| 186 | } |
| 187 | |
| 188 | static void done_client_write(int err, void *p) |
| 189 | { |
| 190 | struct client *c = p; |
| 191 | |
| 192 | if (!err) |
| 193 | selbuf_enable(&c->b); |
| 194 | else { |
| 195 | logmsg(&c->q, LOG_ERR, "failed to send reply: %s", strerror(err)); |
| 196 | disconnect_client(c); |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | static void write_to_client(struct client *c, const char *fmt, ...) |
| 201 | { |
| 202 | va_list ap; |
| 203 | char buf[WRBUFSZ]; |
| 204 | ssize_t n; |
| 205 | |
| 206 | va_start(ap, fmt); |
| 207 | n = vsnprintf(buf, sizeof(buf), fmt, ap); |
| 208 | if (n < 0) { |
| 209 | logmsg(&c->q, LOG_ERR, "failed to format output: %s", strerror(errno)); |
| 210 | disconnect_client(c); |
| 211 | return; |
| 212 | } else if (n > sizeof(buf)) { |
| 213 | logmsg(&c->q, LOG_ERR, "output too long for client send buffer"); |
| 214 | disconnect_client(c); |
| 215 | return; |
| 216 | } |
| 217 | |
| 218 | selbuf_disable(&c->b); |
| 219 | if (queue_write(&c->wb, buf, n)) { |
| 220 | logmsg(&c->q, LOG_ERR, "write buffer overflow"); |
| 221 | disconnect_client(c); |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | static void reply(struct client *c, const char *ty, |
| 226 | const char *tok0, const char *tok1) |
| 227 | { |
| 228 | write_to_client(c, "%u,%u:%s:%s%s%s\r\n", |
| 229 | c->q.s[L].port, c->q.s[R].port, ty, |
| 230 | tok0, tok1 ? ":" : "", tok1 ? tok1 : ""); |
| 231 | } |
| 232 | |
| 233 | const char *const errtok[] = { |
| 234 | #define DEFTOK(err, tok) tok, |
| 235 | ERROR(DEFTOK) |
| 236 | #undef DEFTOK |
| 237 | }; |
| 238 | |
| 239 | static void reply_error(struct client *c, unsigned err) |
| 240 | { |
| 241 | assert(err < E_LIMIT); |
| 242 | reply(c, "ERROR", errtok[err], 0); |
| 243 | } |
| 244 | |
| 245 | static void skipws(const char **pp) |
| 246 | { while (isspace((unsigned char )**pp)) (*pp)++; } |
| 247 | |
| 248 | static int idtoken(const char **pp, char *q, size_t n) |
| 249 | { |
| 250 | const char *p = *pp; |
| 251 | |
| 252 | skipws(&p); |
| 253 | n--; |
| 254 | for (;;) { |
| 255 | if (*p == ':' || *p <= 32 || *p >= 127) break; |
| 256 | if (!n) return (-1); |
| 257 | *q++ = *p++; |
| 258 | n--; |
| 259 | } |
| 260 | *q++ = 0; |
| 261 | *pp = p; |
| 262 | return (0); |
| 263 | } |
| 264 | |
| 265 | static int unum(const char **pp, unsigned *ii, unsigned min, unsigned max) |
| 266 | { |
| 267 | char *q; |
| 268 | unsigned long i; |
| 269 | int e; |
| 270 | |
| 271 | skipws(pp); |
| 272 | if (!isdigit((unsigned char)**pp)) return (-1); |
| 273 | e = errno; errno = 0; |
| 274 | i = strtoul(*pp, &q, 10); |
| 275 | if (errno) return (-1); |
| 276 | *pp = q; |
| 277 | errno = e; |
| 278 | if (i < min || i > max) return (-1); |
| 279 | *ii = i; |
| 280 | return (0); |
| 281 | } |
| 282 | |
| 283 | static void proxy_line(char *line, size_t sz, void *p) |
| 284 | { |
| 285 | struct proxy *px = p; |
| 286 | char buf[1024]; |
| 287 | const char *q = line; |
| 288 | unsigned lp, rp; |
| 289 | |
| 290 | while (sz && isspace((unsigned char)line[sz - 1])) sz--; |
| 291 | printf("received proxy line from %s: %s\n", px->nat, line); |
| 292 | |
| 293 | if (unum(&q, &lp, 1, 65535)) goto syntax; |
| 294 | skipws(&q); if (*q != ',') goto syntax; q++; |
| 295 | if (unum(&q, &rp, 1, 65535)) goto syntax; |
| 296 | skipws(&q); if (*q != ':') goto syntax; q++; |
| 297 | if (lp != px->c->q.u.nat.port || rp != px->c->q.s[R].port) goto syntax; |
| 298 | if (idtoken(&q, buf, sizeof(buf))) goto syntax; |
| 299 | skipws(&q); if (*q != ':') goto syntax; q++; |
| 300 | if (strcmp(buf, "ERROR") == 0) { |
| 301 | skipws(&q); |
| 302 | logmsg(&px->c->q, LOG_ERR, "proxy error from %s: %s", px->nat, q); |
| 303 | reply(px->c, "ERROR", q, 0); |
| 304 | } else if (strcmp(buf, "USERID") == 0) { |
| 305 | if (idtoken(&q, buf, sizeof(buf))) goto syntax; |
| 306 | skipws(&q); if (*q != ':') goto syntax; q++; |
| 307 | skipws(&q); |
| 308 | logmsg(&px->c->q, LOG_ERR, "user `%s'; proxy = %s, os = %s", |
| 309 | q, px->nat, buf); |
| 310 | reply(px->c, "USERID", buf, q); |
| 311 | } else |
| 312 | goto syntax; |
| 313 | goto done; |
| 314 | |
| 315 | syntax: |
| 316 | logmsg(&px->c->q, LOG_ERR, "failed to parse response from %s", px->nat); |
| 317 | reply_error(px->c, E_UNKNOWN); |
| 318 | done: |
| 319 | cancel_proxy(px); |
| 320 | } |
| 321 | |
| 322 | static void done_proxy_write(int err, void *p) |
| 323 | { |
| 324 | struct proxy *px = p; |
| 325 | |
| 326 | if (err) { |
| 327 | logmsg(&px->c->q, LOG_ERR, "failed to proxy query to %s: %s", |
| 328 | px->nat, strerror(errno)); |
| 329 | reply_error(px->c, E_UNKNOWN); |
| 330 | cancel_proxy(px); |
| 331 | return; |
| 332 | } |
| 333 | selbuf_enable(&px->b); |
| 334 | } |
| 335 | |
| 336 | static void proxy_connected(int fd, void *p) |
| 337 | { |
| 338 | struct proxy *px = p; |
| 339 | char buf[16]; |
| 340 | int n; |
| 341 | |
| 342 | if (fd < 0) { |
| 343 | logmsg(&px->c->q, LOG_ERR, |
| 344 | "failed to make %s proxy connection to %s: %s", |
| 345 | px->c->l->ao->name, px->nat, strerror(errno)); |
| 346 | reply_error(px->c, E_UNKNOWN); |
| 347 | cancel_proxy(px); |
| 348 | return; |
| 349 | } |
| 350 | |
| 351 | px->fd = fd; |
| 352 | selbuf_init(&px->b, &sel, fd, proxy_line, px); |
| 353 | selbuf_setsize(&px->b, 1024); |
| 354 | selbuf_disable(&px->b); |
| 355 | init_writebuf(&px->wb, fd, done_proxy_write, px); |
| 356 | |
| 357 | n = sprintf(buf, "%u,%u\r\n", px->c->q.u.nat.port, px->c->q.s[R].port); |
| 358 | queue_write(&px->wb, buf, n); |
| 359 | } |
| 360 | |
| 361 | static void proxy_query(struct client *c) |
| 362 | { |
| 363 | struct socket s; |
| 364 | struct sockaddr_storage ss; |
| 365 | size_t ssz; |
| 366 | struct proxy *px; |
| 367 | int fd; |
| 368 | |
| 369 | px = xmalloc(sizeof(*px)); |
| 370 | inet_ntop(c->q.ao->af, &c->q.u.nat.addr, px->nat, sizeof(px->nat)); |
| 371 | |
| 372 | if ((fd = socket(c->q.ao->af, SOCK_STREAM, 0)) < 0) { |
| 373 | logmsg(&c->q, LOG_ERR, "failed to make %s socket for proxy: %s", |
| 374 | c->l->ao->name, strerror(errno)); |
| 375 | goto err_0; |
| 376 | } |
| 377 | if (fix_up_socket(fd, "proxy")) goto err_1; |
| 378 | |
| 379 | s = c->q.u.nat; |
| 380 | s.port = 113; |
| 381 | c->l->ao->socket_to_sockaddr(&s, &ss, &ssz); |
| 382 | selbuf_disable(&c->b); |
| 383 | c->px = px; px->c = c; |
| 384 | px->fd = -1; |
| 385 | if (conn_init(&px->cn, &sel, fd, (struct sockaddr *)&ss, ssz, |
| 386 | proxy_connected, px)) { |
| 387 | logmsg(&c->q, LOG_ERR, "failed to make %s proxy connection to %s: %s", |
| 388 | c->l->ao->name, px->nat, strerror(errno)); |
| 389 | goto err_2; |
| 390 | } |
| 391 | |
| 392 | return; |
| 393 | |
| 394 | err_2: |
| 395 | selbuf_enable(&c->b); |
| 396 | err_1: |
| 397 | close(px->fd); |
| 398 | err_0: |
| 399 | xfree(px); |
| 400 | reply_error(c, E_UNKNOWN); |
| 401 | } |
| 402 | |
| 403 | static const struct policy default_policy = POLICY_INIT(A_NAME); |
| 404 | |
| 405 | static void user_token(char *p) |
| 406 | { |
| 407 | static const char tokmap[64] = |
| 408 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.-"; |
| 409 | unsigned a = 0; |
| 410 | unsigned b = 0; |
| 411 | int i; |
| 412 | #define TOKENSZ 8 |
| 413 | |
| 414 | if (tokenptr + TOKENSZ >= sizeof(tokenbuf)) { |
| 415 | if (read(randfd, tokenbuf, sizeof(tokenbuf)) < sizeof(tokenbuf)) |
| 416 | die(1, "unexpected short read or error from `/dev/urandom'"); |
| 417 | tokenptr = 0; |
| 418 | } |
| 419 | |
| 420 | for (i = 0; i < TOKENSZ; i++) { |
| 421 | a = (a << 8) | tokenbuf[tokenptr++]; b += 8; |
| 422 | while (b >= 6) { |
| 423 | b -= 6; |
| 424 | *p++ = tokmap[(a >> b) & 0x3f]; |
| 425 | } |
| 426 | } |
| 427 | if (b) |
| 428 | *p++ = tokmap[(a << (6 - b)) & 0x3f]; |
| 429 | *p++ = 0; |
| 430 | } |
| 431 | |
| 432 | static void client_line(char *line, size_t len, void *p) |
| 433 | { |
| 434 | struct client *c = p; |
| 435 | const char *q; |
| 436 | struct passwd *pw = 0; |
| 437 | const struct policy *pol; |
| 438 | dstr d = DSTR_INIT; |
| 439 | struct policy upol = POLICY_INIT(A_LIMIT); |
| 440 | struct policy_file pf; |
| 441 | char buf[16]; |
| 442 | int i; |
| 443 | |
| 444 | c->q.s[L].port = c->q.s[R].port = 0; |
| 445 | if (!line) { |
| 446 | disconnect_client(c); |
| 447 | return; |
| 448 | } |
| 449 | |
| 450 | if (fwatch_update(&polfw, "yaid.policy")) { |
| 451 | logmsg(0, LOG_INFO, "reload master policy file `%s'", "yaid.policy"); |
| 452 | load_policy_file("yaid.policy", &policy); |
| 453 | } |
| 454 | |
| 455 | q = line; |
| 456 | if (unum(&q, &c->q.s[L].port, 1, 65535)) goto bad; |
| 457 | skipws(&q); if (*q != ',') goto bad; q++; |
| 458 | if (unum(&q, &c->q.s[R].port, 1, 65535)) goto bad; |
| 459 | skipws(&q); if (*q) goto bad; |
| 460 | |
| 461 | identify(&c->q); |
| 462 | switch (c->q.resp) { |
| 463 | case R_UID: |
| 464 | if ((pw = getpwuid(c->q.u.uid)) == 0) { |
| 465 | logmsg(&c->q, LOG_ERR, "no passwd entry for user %d", c->q.u.uid); |
| 466 | reply_error(c, E_NOUSER); |
| 467 | return; |
| 468 | } |
| 469 | break; |
| 470 | case R_NAT: |
| 471 | proxy_query(c); |
| 472 | return; |
| 473 | case R_ERROR: |
| 474 | /* Should already be logged. */ |
| 475 | reply_error(c, c->q.u.error); |
| 476 | return; |
| 477 | default: |
| 478 | abort(); |
| 479 | } |
| 480 | |
| 481 | for (i = 0; i < DA_LEN(&policy); i++) { |
| 482 | pol = &DA(&policy)[i]; |
| 483 | if (!match_policy(pol, &c->q)) continue; |
| 484 | if (pol->act.act != A_USER) |
| 485 | goto match; |
| 486 | DRESET(&d); |
| 487 | dstr_putf(&d, "%s/.yaid.policy", pw->pw_dir); |
| 488 | if (open_policy_file(&pf, d.buf, "user policy file", &c->q)) |
| 489 | continue; |
| 490 | while (!read_policy_file(&pf)) { |
| 491 | if (pf.lno > 100) { |
| 492 | logmsg(&c->q, LOG_ERR, "%s:%d: user policy file too long", |
| 493 | pf.name, pf.lno); |
| 494 | break; |
| 495 | } |
| 496 | if (!match_policy(&pf.p, &c->q)) continue; |
| 497 | if (!(pol->act.u.user & (1 << pf.p.act.act))) { |
| 498 | logmsg(&c->q, LOG_ERR, |
| 499 | "%s:%d: user action forbidden by global policy", |
| 500 | pf.name, pf.lno); |
| 501 | continue; |
| 502 | } |
| 503 | upol = pf.p; pol = &upol; |
| 504 | init_policy(&pf.p); |
| 505 | close_policy_file(&pf); |
| 506 | goto match; |
| 507 | } |
| 508 | close_policy_file(&pf); |
| 509 | } |
| 510 | pol = &default_policy; |
| 511 | |
| 512 | match: |
| 513 | DDESTROY(&d); |
| 514 | switch (pol->act.act) { |
| 515 | case A_NAME: |
| 516 | logmsg(&c->q, LOG_INFO, "user `%s' (%d)", pw->pw_name, c->q.u.uid); |
| 517 | reply(c, "USERID", "UNIX", pw->pw_name); |
| 518 | break; |
| 519 | case A_TOKEN: |
| 520 | user_token(buf); |
| 521 | logmsg(&c->q, LOG_INFO, "user `%s' (%d); token = %s", |
| 522 | pw->pw_name, c->q.u.uid, buf); |
| 523 | reply(c, "USERID", "OTHER", buf); |
| 524 | break; |
| 525 | case A_DENY: |
| 526 | logmsg(&c->q, LOG_INFO, "user `%s' (%d); denying", |
| 527 | pw->pw_name, c->q.u.uid); |
| 528 | break; |
| 529 | case A_HIDE: |
| 530 | logmsg(&c->q, LOG_INFO, "user `%s' (%d); hiding", |
| 531 | pw->pw_name, c->q.u.uid); |
| 532 | reply_error(c, E_HIDDEN); |
| 533 | break; |
| 534 | case A_LIE: |
| 535 | logmsg(&c->q, LOG_INFO, "user `%s' (%d); lie = `%s'", |
| 536 | pw->pw_name, c->q.u.uid, pol->act.u.lie); |
| 537 | reply(c, "USERID", "UNIX", pol->act.u.lie); |
| 538 | break; |
| 539 | default: |
| 540 | abort(); |
| 541 | } |
| 542 | |
| 543 | free_policy(&upol); |
| 544 | return; |
| 545 | |
| 546 | bad: |
| 547 | logmsg(&c->q, LOG_ERR, "failed to parse query from client"); |
| 548 | disconnect_client(c); |
| 549 | } |
| 550 | |
| 551 | static void accept_client(int fd, unsigned mode, void *p) |
| 552 | { |
| 553 | struct listen *l = p; |
| 554 | struct client *c; |
| 555 | struct sockaddr_storage ssr, ssl; |
| 556 | size_t ssz = sizeof(ssr); |
| 557 | int sk; |
| 558 | |
| 559 | if ((sk = accept(fd, (struct sockaddr *)&ssr, &ssz)) < 0) { |
| 560 | if (errno != EAGAIN && errno == EWOULDBLOCK) { |
| 561 | logmsg(0, LOG_ERR, "failed to accept incoming %s connection: %s", |
| 562 | l->ao->name, strerror(errno)); |
| 563 | } |
| 564 | return; |
| 565 | } |
| 566 | if (fix_up_socket(sk, "incoming client")) { close(sk); return; } |
| 567 | |
| 568 | c = xmalloc(sizeof(*c)); |
| 569 | c->l = l; |
| 570 | c->q.ao = l->ao; |
| 571 | l->ao->sockaddr_to_addr(&ssr, &c->q.s[R].addr); |
| 572 | ssz = sizeof(ssl); |
| 573 | if (getsockname(sk, (struct sockaddr *)&ssl, &ssz)) { |
| 574 | logmsg(0, LOG_ERR, |
| 575 | "failed to read local address for incoming %s connection: %s", |
| 576 | l->ao->name, strerror(errno)); |
| 577 | close(sk); |
| 578 | xfree(c); |
| 579 | return; |
| 580 | } |
| 581 | l->ao->sockaddr_to_addr(&ssl, &c->q.s[L].addr); |
| 582 | c->q.s[L].port = c->q.s[R].port = 0; |
| 583 | |
| 584 | /* logmsg(&c->q, LOG_INFO, "accepted %s connection", l->ao->name); */ |
| 585 | |
| 586 | selbuf_init(&c->b, &sel, sk, client_line, c); |
| 587 | selbuf_setsize(&c->b, 1024); |
| 588 | c->fd = sk; |
| 589 | c->px = 0; |
| 590 | init_writebuf(&c->wb, sk, done_client_write, c); |
| 591 | } |
| 592 | |
| 593 | static int make_listening_socket(const struct addrops *ao, int port) |
| 594 | { |
| 595 | int fd; |
| 596 | int yes = 1; |
| 597 | struct socket s; |
| 598 | struct sockaddr_storage ss; |
| 599 | struct listen *l; |
| 600 | size_t ssz; |
| 601 | |
| 602 | if ((fd = socket(ao->af, SOCK_STREAM, 0)) < 0) { |
| 603 | if (errno == EAFNOSUPPORT) return (-1); |
| 604 | die(1, "failed to create %s listening socket: %s", |
| 605 | ao->name, strerror(errno)); |
| 606 | } |
| 607 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)); |
| 608 | s.addr = *ao->any; |
| 609 | s.port = port; |
| 610 | ao->socket_to_sockaddr(&s, &ss, &ssz); |
| 611 | if (ao->init_listen_socket(fd)) { |
| 612 | die(1, "failed to initialize %s listening socket: %s", |
| 613 | ao->name, strerror(errno)); |
| 614 | } |
| 615 | if (bind(fd, (struct sockaddr *)&ss, ssz)) { |
| 616 | die(1, "failed to bind %s listening socket: %s", |
| 617 | ao->name, strerror(errno)); |
| 618 | } |
| 619 | if (fdflags(fd, O_NONBLOCK, O_NONBLOCK, 0, 0)) { |
| 620 | die(1, "failed to set %s listening socket nonblocking: %s", |
| 621 | ao->name, strerror(errno)); |
| 622 | } |
| 623 | if (listen(fd, 5)) |
| 624 | die(1, "failed to listen for %s: %s", ao->name, strerror(errno)); |
| 625 | |
| 626 | l = xmalloc(sizeof(*l)); |
| 627 | l->ao = ao; |
| 628 | sel_initfile(&sel, &l->f, fd, SEL_READ, accept_client, l); |
| 629 | sel_addfile(&l->f); |
| 630 | |
| 631 | return (0); |
| 632 | } |
| 633 | |
| 634 | int main(int argc, char *argv[]) |
| 635 | { |
| 636 | int port = 113; |
| 637 | const struct addrops *ao; |
| 638 | int any = 0; |
| 639 | |
| 640 | ego(argv[0]); |
| 641 | |
| 642 | fwatch_init(&polfw, "yaid.policy"); |
| 643 | init_sys(); |
| 644 | if (load_policy_file("yaid.policy", &policy)) |
| 645 | exit(1); |
| 646 | { int i; |
| 647 | for (i = 0; i < DA_LEN(&policy); i++) |
| 648 | print_policy(&DA(&policy)[i]); |
| 649 | } |
| 650 | |
| 651 | if ((randfd = open("/dev/urandom", O_RDONLY)) < 0) { |
| 652 | die(1, "failed to open `/dev/urandom' for reading: %s", |
| 653 | strerror(errno)); |
| 654 | } |
| 655 | |
| 656 | sel_init(&sel); |
| 657 | for (ao = addroptab; ao->name; ao++) |
| 658 | if (!make_listening_socket(ao, port)) any = 1; |
| 659 | if (!any) |
| 660 | die(1, "no IP protocols supported"); |
| 661 | |
| 662 | for (;;) |
| 663 | if (sel_select(&sel)) die(1, "select failed: %s", strerror(errno)); |
| 664 | |
| 665 | return (0); |
| 666 | } |
| 667 | |
| 668 | /*----- That's all, folks -------------------------------------------------*/ |