| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Forwarding UDP packets over a stream |
| 4 | * |
| 5 | * (c) 2003 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 it under |
| 13 | * the terms of the GNU General Public License as published by the Free |
| 14 | * Software Foundation; either version 3 of the License, or (at your |
| 15 | * option) any later version. |
| 16 | * |
| 17 | * TrIPE is distributed in the hope that it will be useful, but WITHOUT |
| 18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 20 | * for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with TrIPE. If not, see <https://www.gnu.org/licenses/>. |
| 24 | */ |
| 25 | |
| 26 | /*----- Header files ------------------------------------------------------*/ |
| 27 | |
| 28 | #include "config.h" |
| 29 | |
| 30 | #include <ctype.h> |
| 31 | #include <errno.h> |
| 32 | #include <stdio.h> |
| 33 | #include <stdlib.h> |
| 34 | #include <string.h> |
| 35 | |
| 36 | #include <sys/time.h> |
| 37 | #include <sys/types.h> |
| 38 | #include <unistd.h> |
| 39 | #include <fcntl.h> |
| 40 | #include <sys/uio.h> |
| 41 | #include <sys/socket.h> |
| 42 | #include <netinet/in.h> |
| 43 | #include <arpa/inet.h> |
| 44 | #include <netdb.h> |
| 45 | |
| 46 | #include <mLib/alloc.h> |
| 47 | #include <mLib/bits.h> |
| 48 | #include <mLib/darray.h> |
| 49 | #include <mLib/dstr.h> |
| 50 | #include <mLib/fdflags.h> |
| 51 | #include <mLib/mdwopt.h> |
| 52 | #include <mLib/quis.h> |
| 53 | #include <mLib/report.h> |
| 54 | #include <mLib/sel.h> |
| 55 | #include <mLib/selpk.h> |
| 56 | |
| 57 | #include "util.h" |
| 58 | |
| 59 | /*----- Data structures ---------------------------------------------------*/ |
| 60 | |
| 61 | typedef union addr { |
| 62 | struct sockaddr sa; |
| 63 | struct sockaddr_in sin; |
| 64 | struct sockaddr_in6 sin6; |
| 65 | } addr; |
| 66 | |
| 67 | DA_DECL(addr_v, addr); |
| 68 | DA_DECL(str_v, const char *); |
| 69 | |
| 70 | typedef struct pk { |
| 71 | struct pk *next; /* Next packet in the chain */ |
| 72 | octet *p, *o; /* Buffer start and current posn */ |
| 73 | size_t n; /* Size of packet remaining */ |
| 74 | } pk; |
| 75 | |
| 76 | typedef struct pkstream { |
| 77 | unsigned f; /* Flags... */ |
| 78 | #define PKF_FULL 1u /* Buffer is full: stop reading */ |
| 79 | sel_file r, w; /* Read and write selectors */ |
| 80 | pk *pks, **pk_tail; /* Packet queue */ |
| 81 | size_t npk, szpk; /* Number and size of data */ |
| 82 | selpk p; /* Packet parser */ |
| 83 | } pkstream; |
| 84 | |
| 85 | typedef struct connwait { |
| 86 | unsigned f; /* Various flags */ |
| 87 | #define cwf_port 1u /* Port is defined => listen */ |
| 88 | sel_file *sfv; /* Selectors */ |
| 89 | addr_v me, peer; /* Who I'm meant to be; who peer is */ |
| 90 | } connwait; |
| 91 | |
| 92 | /*----- Static variables --------------------------------------------------*/ |
| 93 | |
| 94 | static sel_state sel; |
| 95 | static connwait cw; |
| 96 | static int fd_udp; |
| 97 | static size_t pk_nmax = 128, pk_szmax = 1024*1024; |
| 98 | |
| 99 | /*----- Main code ---------------------------------------------------------*/ |
| 100 | |
| 101 | static int nonblockify(int fd) |
| 102 | { return (fdflags(fd, O_NONBLOCK, O_NONBLOCK, 0, 0)); } |
| 103 | |
| 104 | static int cloexec(int fd) |
| 105 | { return (fdflags(fd, 0, 0, FD_CLOEXEC, FD_CLOEXEC)); } |
| 106 | |
| 107 | static socklen_t addrsz(const addr *a) |
| 108 | { |
| 109 | switch (a->sa.sa_family) { |
| 110 | case AF_INET: return sizeof(a->sin); |
| 111 | case AF_INET6: return sizeof(a->sin6); |
| 112 | default: abort(); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | static int knownafp(int af) |
| 117 | { |
| 118 | switch (af) { |
| 119 | case AF_INET: case AF_INET6: return (1); |
| 120 | default: return (0); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | static int initsock(int fd, int af) |
| 125 | { |
| 126 | int yes = 1; |
| 127 | |
| 128 | switch (af) { |
| 129 | case AF_INET: break; |
| 130 | case AF_INET6: |
| 131 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes))) |
| 132 | return (-1); |
| 133 | break; |
| 134 | default: abort(); |
| 135 | } |
| 136 | return (0); |
| 137 | } |
| 138 | |
| 139 | static const char *addrstr(const addr *a) |
| 140 | { |
| 141 | static char buf[128]; |
| 142 | socklen_t n = sizeof(buf); |
| 143 | |
| 144 | if (getnameinfo(&a->sa, addrsz(a), buf, n, 0, 0, NI_NUMERICHOST)) |
| 145 | return ("<addrstr failed>"); |
| 146 | return (buf); |
| 147 | } |
| 148 | |
| 149 | static int addreq(const addr *a, const addr *b) |
| 150 | { |
| 151 | if (a->sa.sa_family != b->sa.sa_family) return (0); |
| 152 | switch (a->sa.sa_family) { |
| 153 | case AF_INET: |
| 154 | return (a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr); |
| 155 | case AF_INET6: |
| 156 | return (!memcmp(a->sin6.sin6_addr.s6_addr, |
| 157 | b->sin6.sin6_addr.s6_addr, |
| 158 | 16) && |
| 159 | a->sin6.sin6_scope_id == b->sin6.sin6_scope_id); |
| 160 | default: |
| 161 | abort(); |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | static void initaddr(addr *a, int af) |
| 166 | { |
| 167 | a->sa.sa_family = af; |
| 168 | switch (af) { |
| 169 | case AF_INET: |
| 170 | a->sin.sin_addr.s_addr = INADDR_ANY; |
| 171 | a->sin.sin_port = 0; |
| 172 | break; |
| 173 | case AF_INET6: |
| 174 | memset(a->sin6.sin6_addr.s6_addr, 0, 16); |
| 175 | a->sin6.sin6_port = 0; |
| 176 | a->sin6.sin6_flowinfo = 0; |
| 177 | a->sin6.sin6_scope_id = 0; |
| 178 | break; |
| 179 | default: |
| 180 | abort(); |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | #define caf_addr 1u |
| 185 | #define caf_port 2u |
| 186 | static void copyaddr(addr *a, const struct sockaddr *sa, unsigned f) |
| 187 | { |
| 188 | const struct sockaddr_in *sin; |
| 189 | const struct sockaddr_in6 *sin6; |
| 190 | |
| 191 | a->sa.sa_family = sa->sa_family; |
| 192 | switch (sa->sa_family) { |
| 193 | case AF_INET: |
| 194 | sin = (const struct sockaddr_in *)sa; |
| 195 | if (f&caf_addr) a->sin.sin_addr = sin->sin_addr; |
| 196 | if (f&caf_port) a->sin.sin_port = sin->sin_port; |
| 197 | break; |
| 198 | case AF_INET6: |
| 199 | sin6 = (const struct sockaddr_in6 *)sa; |
| 200 | if (f&caf_addr) { |
| 201 | a->sin6.sin6_addr = sin6->sin6_addr; |
| 202 | a->sin6.sin6_scope_id = sin6->sin6_scope_id; |
| 203 | } |
| 204 | if (f&caf_port) a->sin6.sin6_port = sin6->sin6_port; |
| 205 | /* ??? flowinfo? */ |
| 206 | break; |
| 207 | default: |
| 208 | abort(); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | static void dolisten(void); |
| 213 | |
| 214 | static void doclose(pkstream *p) |
| 215 | { |
| 216 | pk *pk, *ppk; |
| 217 | close(p->w.fd); |
| 218 | close(p->p.reader.fd); |
| 219 | selpk_destroy(&p->p); |
| 220 | if (!(p->f&PKF_FULL)) sel_rmfile(&p->r); |
| 221 | if (p->npk) sel_rmfile(&p->w); |
| 222 | for (pk = p->pks; pk; pk = ppk) { |
| 223 | ppk = pk->next; |
| 224 | xfree(pk->p); |
| 225 | xfree(pk); |
| 226 | } |
| 227 | xfree(p); |
| 228 | if (cw.f&cwf_port) dolisten(); |
| 229 | else exit(0); |
| 230 | } |
| 231 | |
| 232 | static void rdtcp(octet *b, size_t sz, pkbuf *pk, size_t *k, void *vp) |
| 233 | { |
| 234 | pkstream *p = vp; |
| 235 | size_t pksz; |
| 236 | |
| 237 | if (!sz) { doclose(p); return; } |
| 238 | pksz = LOAD16(b); |
| 239 | if (pksz + 2 == sz) { |
| 240 | DISCARD(write(fd_udp, b + 2, pksz)); |
| 241 | selpk_want(&p->p, 2); |
| 242 | } else { |
| 243 | selpk_want(&p->p, pksz + 2); |
| 244 | *k = sz; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | static void wrtcp(int fd, unsigned mode, void *vp) |
| 249 | { |
| 250 | #define NPK 16 |
| 251 | struct iovec iov[NPK]; |
| 252 | pkstream *p = vp; |
| 253 | size_t i; |
| 254 | ssize_t n; |
| 255 | pk *pk, *ppk; |
| 256 | |
| 257 | for (i = 0, pk = p->pks; i < NPK && pk; i++, pk = pk->next) { |
| 258 | iov[i].iov_base = pk->o; |
| 259 | iov[i].iov_len = pk->n; |
| 260 | } |
| 261 | |
| 262 | if ((n = writev(fd, iov, i)) < 0) { |
| 263 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) return; |
| 264 | moan("couldn't write to TCP socket: %s", strerror(errno)); |
| 265 | doclose(p); |
| 266 | return; |
| 267 | } |
| 268 | |
| 269 | p->szpk -= n; |
| 270 | for (pk = p->pks; n && pk; pk = ppk) { |
| 271 | ppk = pk->next; |
| 272 | if (pk->n <= n) { |
| 273 | p->npk--; |
| 274 | n -= pk->n; |
| 275 | xfree(pk->p); |
| 276 | xfree(pk); |
| 277 | } else { |
| 278 | pk->n -= n; |
| 279 | pk->o += n; |
| 280 | break; |
| 281 | } |
| 282 | } |
| 283 | p->pks = pk; |
| 284 | if (!pk) { p->pk_tail = &p->pks; sel_rmfile(&p->w); } |
| 285 | if ((p->f&PKF_FULL) && p->npk < pk_nmax && p->szpk < pk_szmax) |
| 286 | { p->f &= ~PKF_FULL; sel_addfile(&p->r); } |
| 287 | } |
| 288 | |
| 289 | static void rdudp(int fd, unsigned mode, void *vp) |
| 290 | { |
| 291 | octet buf[65536]; |
| 292 | ssize_t n; |
| 293 | pkstream *p = vp; |
| 294 | pk *pk; |
| 295 | |
| 296 | if ((n = read(fd, buf, sizeof(buf))) < 0) { |
| 297 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) |
| 298 | return; |
| 299 | moan("couldn't read from UDP socket: %s", strerror(errno)); |
| 300 | return; |
| 301 | } |
| 302 | pk = xmalloc(sizeof(*pk)); |
| 303 | pk->next = 0; |
| 304 | pk->p = xmalloc(n + 2); |
| 305 | STORE16(pk->p, n); |
| 306 | memcpy(pk->p + 2, buf, n); |
| 307 | pk->o = pk->p; |
| 308 | pk->n = n + 2; |
| 309 | *p->pk_tail = pk; |
| 310 | p->pk_tail = &pk->next; |
| 311 | if (!p->npk) sel_addfile(&p->w); |
| 312 | sel_force(&p->w); |
| 313 | p->npk++; |
| 314 | p->szpk += n + 2; |
| 315 | if (p->npk >= pk_nmax || p->szpk >= pk_szmax) |
| 316 | { sel_rmfile(&p->r); p->f |= PKF_FULL; } |
| 317 | } |
| 318 | |
| 319 | static void dofwd(int fd_in, int fd_out) |
| 320 | { |
| 321 | pkstream *p = xmalloc(sizeof(*p)); |
| 322 | sel_initfile(&sel, &p->r, fd_udp, SEL_READ, rdudp, p); |
| 323 | sel_initfile(&sel, &p->w, fd_out, SEL_WRITE, wrtcp, p); |
| 324 | selpk_init(&p->p, &sel, fd_in, rdtcp, p); |
| 325 | selpk_want(&p->p, 2); |
| 326 | p->pks = 0; |
| 327 | p->pk_tail = &p->pks; |
| 328 | p->npk = p->szpk = 0; |
| 329 | p->f = 0; |
| 330 | sel_addfile(&p->r); |
| 331 | } |
| 332 | |
| 333 | static void doaccept(int fd_s, unsigned mode, void *p) |
| 334 | { |
| 335 | int fd; |
| 336 | addr a; |
| 337 | socklen_t sz = sizeof(a); |
| 338 | size_t i, n; |
| 339 | |
| 340 | if ((fd = accept(fd_s, &a.sa, &sz)) < 0) { |
| 341 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) return; |
| 342 | moan("couldn't accept incoming connection: %s", strerror(errno)); |
| 343 | return; |
| 344 | } |
| 345 | n = DA_LEN(&cw.peer); |
| 346 | if (!n) goto match; |
| 347 | for (i = 0; i < n; i++) if (addreq(&a, &DA(&cw.peer)[i])) goto match; |
| 348 | moan("rejecting connection from %s", addrstr(&a)); |
| 349 | close(fd); return; |
| 350 | match: |
| 351 | if (nonblockify(fd) || cloexec(fd)) { |
| 352 | moan("couldn't accept incoming connection: %s", strerror(errno)); |
| 353 | close(fd); return; |
| 354 | } |
| 355 | dofwd(fd, fd); |
| 356 | n = DA_LEN(&cw.me); |
| 357 | for (i = 0; i < n; i++) { close(cw.sfv[i].fd); sel_rmfile(&cw.sfv[i]); } |
| 358 | } |
| 359 | |
| 360 | static void dolisten1(const addr *a, sel_file *sf) |
| 361 | { |
| 362 | int fd; |
| 363 | int opt = 1; |
| 364 | |
| 365 | if ((fd = socket(a->sa.sa_family, SOCK_STREAM, IPPROTO_TCP)) < 0 || |
| 366 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) || |
| 367 | initsock(fd, a->sa.sa_family) || |
| 368 | bind(fd, &a->sa, addrsz(a)) || |
| 369 | listen(fd, 1) || nonblockify(fd) || cloexec(fd)) |
| 370 | die(1, "couldn't set up listening socket: %s", strerror(errno)); |
| 371 | sel_initfile(&sel, sf, fd, SEL_READ, doaccept, 0); |
| 372 | sel_addfile(sf); |
| 373 | } |
| 374 | |
| 375 | static void dolisten(void) |
| 376 | { |
| 377 | size_t i, n; |
| 378 | |
| 379 | n = DA_LEN(&cw.me); |
| 380 | for (i = 0; i < n; i++) |
| 381 | dolisten1(&DA(&cw.me)[i], &cw.sfv[i]); |
| 382 | } |
| 383 | |
| 384 | static void pushaddrs(addr_v *av, const struct addrinfo *ailist) |
| 385 | { |
| 386 | const struct addrinfo *ai; |
| 387 | size_t i, n; |
| 388 | |
| 389 | for (ai = ailist, n = 0; ai; ai = ai->ai_next) |
| 390 | if (knownafp(ai->ai_family)) n++; |
| 391 | DA_ENSURE(av, n); |
| 392 | for (i = DA_LEN(av), ai = ailist; ai; ai = ai->ai_next) { |
| 393 | if (!knownafp(ai->ai_family)) continue; |
| 394 | initaddr(&DA(av)[i], ai->ai_family); |
| 395 | copyaddr(&DA(av)[i++], ai->ai_addr, caf_addr | caf_port); |
| 396 | } |
| 397 | DA_EXTEND(av, n); |
| 398 | } |
| 399 | |
| 400 | #define paf_parse 1u |
| 401 | static void parseaddr(const struct addrinfo *aihint, |
| 402 | const char *host, const char *svc, unsigned f, |
| 403 | struct addrinfo **ai_out) |
| 404 | { |
| 405 | char *alloc = 0, *sep; |
| 406 | int err; |
| 407 | |
| 408 | if (f&paf_parse) { |
| 409 | alloc = xstrdup(host); |
| 410 | if (alloc[0] != '[') { |
| 411 | if ((sep = strchr(alloc, ':')) == 0) |
| 412 | die(1, "missing port number in address `%s'", host); |
| 413 | host = alloc; *sep = 0; svc = sep + 1; |
| 414 | } else { |
| 415 | if ((sep = strchr(alloc, ']')) == 0 || sep[1] != ':') |
| 416 | die(1, "bad syntax in address `%s:'", host); |
| 417 | host = alloc + 1; *sep = 0; svc = sep + 2; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | err = getaddrinfo(host, svc, aihint, ai_out); |
| 422 | if (err) { |
| 423 | if (host && svc) { |
| 424 | die(1, "failed to resolve hostname `%s', service `%s': %s", |
| 425 | host, svc, gai_strerror(err)); |
| 426 | } else if (host) |
| 427 | die(1, "failed to resolve hostname `%s': %s", host, gai_strerror(err)); |
| 428 | else |
| 429 | die(1, "failed to resolve service `%s': %s", svc, gai_strerror(err)); |
| 430 | } |
| 431 | |
| 432 | xfree(alloc); |
| 433 | } |
| 434 | |
| 435 | static void usage(FILE *fp) |
| 436 | { |
| 437 | pquis(fp, |
| 438 | "Usage: $ [-46] [-l PORT] [-b ADDR] [-p ADDR] [-c ADDR:PORT]\n\ |
| 439 | ADDR:PORT ADDR:PORT\n"); |
| 440 | } |
| 441 | |
| 442 | static void version(FILE *fp) |
| 443 | { pquis(fp, "$, tripe version " VERSION "\n"); } |
| 444 | |
| 445 | static void help(FILE *fp) |
| 446 | { |
| 447 | version(fp); |
| 448 | fputc('\n', fp); |
| 449 | usage(fp); |
| 450 | fputs("\n\ |
| 451 | Options:\n\ |
| 452 | \n\ |
| 453 | -h, --help Display this help text.\n\ |
| 454 | -v, --version Display version number.\n\ |
| 455 | -u, --usage Display pointless usage message.\n\ |
| 456 | \n\ |
| 457 | -4, --ipv4 Restrict to IPv4 only.\n\ |
| 458 | -6, --ipv6 Restrict to IPv6 only.\n\ |
| 459 | -l, --listen=PORT Listen for connections to TCP PORT.\n\ |
| 460 | -p, --peer=ADDR Only accept connections from IP ADDR.\n\ |
| 461 | -b, --bind=ADDR Bind to ADDR before connecting.\n\ |
| 462 | -c, --connect=ADDR:PORT Connect to IP ADDR, TCP PORT.\n\ |
| 463 | \n\ |
| 464 | Forwards UDP packets over a reliable stream. By default, uses stdin and\n\ |
| 465 | stdout; though it can use TCP sockets instead.\n\ |
| 466 | ", fp); |
| 467 | } |
| 468 | |
| 469 | int main(int argc, char *argv[]) |
| 470 | { |
| 471 | unsigned f = 0; |
| 472 | str_v bindhosts = DA_INIT, peerhosts = DA_INIT; |
| 473 | const char *bindsvc = 0; |
| 474 | addr bindaddr; |
| 475 | const char *connhost = 0; |
| 476 | struct addrinfo aihint = { 0 }, *ai, *ailist; |
| 477 | int af = AF_UNSPEC; |
| 478 | int fd = -1; |
| 479 | int len = 65536; |
| 480 | size_t i, n; |
| 481 | |
| 482 | #define f_bogus 1u |
| 483 | |
| 484 | cw.f = 0; |
| 485 | |
| 486 | ego(argv[0]); |
| 487 | sel_init(&sel); |
| 488 | for (;;) { |
| 489 | static struct option opt[] = { |
| 490 | { "help", 0, 0, 'h' }, |
| 491 | { "version", 0, 0, 'v' }, |
| 492 | { "usage", 0, 0, 'u' }, |
| 493 | { "ipv4", 0, 0, '4' }, |
| 494 | { "ipv6", 0, 0, '6' }, |
| 495 | { "listen", OPTF_ARGREQ, 0, 'l' }, |
| 496 | { "peer", OPTF_ARGREQ, 0, 'p' }, |
| 497 | { "bind", OPTF_ARGREQ, 0, 'b' }, |
| 498 | { "connect", OPTF_ARGREQ, 0, 'c' }, |
| 499 | { 0, 0, 0, 0 } |
| 500 | }; |
| 501 | int i; |
| 502 | |
| 503 | i = mdwopt(argc, argv, "hvu46l:p:b:c:", opt, 0, 0, 0); |
| 504 | if (i < 0) |
| 505 | break; |
| 506 | switch (i) { |
| 507 | case 'h': help(stdout); exit(0); |
| 508 | case 'v': version(stdout); exit(0); |
| 509 | case 'u': usage(stdout); exit(0); |
| 510 | case '4': af = AF_INET; break; |
| 511 | case '6': af = AF_INET6; break; |
| 512 | case 'l': bindsvc = optarg; break; |
| 513 | case 'p': DA_PUSH(&peerhosts, optarg); break; |
| 514 | case 'b': DA_PUSH(&bindhosts, optarg); break; |
| 515 | case 'c': connhost = optarg; break; |
| 516 | default: f |= f_bogus; break; |
| 517 | } |
| 518 | } |
| 519 | if (optind + 2 != argc || (f&f_bogus)) { usage(stderr); exit(1); } |
| 520 | |
| 521 | if (DA_LEN(&bindhosts) && !bindsvc && !connhost) |
| 522 | die(1, "bind addr only makes sense when listening or connecting"); |
| 523 | if (DA_LEN(&peerhosts) && !bindsvc) |
| 524 | die(1, "peer addr only makes sense when listening"); |
| 525 | if (bindsvc && connhost) |
| 526 | die(1, "can't listen and connect"); |
| 527 | |
| 528 | aihint.ai_family = af; |
| 529 | DA_CREATE(&cw.me); DA_CREATE(&cw.peer); |
| 530 | |
| 531 | n = DA_LEN(&bindhosts); |
| 532 | if (n || bindsvc) { |
| 533 | aihint.ai_socktype = SOCK_STREAM; |
| 534 | aihint.ai_protocol = IPPROTO_TCP; |
| 535 | aihint.ai_flags = AI_ADDRCONFIG | AI_PASSIVE; |
| 536 | if (!n) { |
| 537 | parseaddr(&aihint, 0, bindsvc, 0, &ailist); |
| 538 | pushaddrs(&cw.me, ailist); |
| 539 | freeaddrinfo(ailist); |
| 540 | } else if (!bindsvc) { |
| 541 | if (n != 1) die(1, "can only bind to one address as client"); |
| 542 | parseaddr(&aihint, DA(&bindhosts)[0], 0, 0, &ailist); |
| 543 | for (ai = ailist; ai && !knownafp(ai->ai_family); ai = ai->ai_next); |
| 544 | if (!ai) |
| 545 | die(1, "no usable addresses returned for `%s'", DA(&bindhosts)[0]); |
| 546 | initaddr(&bindaddr, ai->ai_family); |
| 547 | copyaddr(&bindaddr, ai->ai_addr, caf_addr); |
| 548 | aihint.ai_family = ai->ai_family; |
| 549 | freeaddrinfo(ailist); |
| 550 | } else for (i = 0; i < n; i++) { |
| 551 | parseaddr(&aihint, DA(&bindhosts)[i], bindsvc, 0, &ailist); |
| 552 | pushaddrs(&cw.me, ailist); |
| 553 | freeaddrinfo(ailist); |
| 554 | } |
| 555 | if (bindsvc) { |
| 556 | cw.f |= cwf_port; |
| 557 | n = DA_LEN(&cw.me); |
| 558 | cw.sfv = xmalloc(n*sizeof(*cw.sfv)); |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | n = DA_LEN(&peerhosts); |
| 563 | if (n) { |
| 564 | aihint.ai_socktype = SOCK_STREAM; |
| 565 | aihint.ai_protocol = IPPROTO_TCP; |
| 566 | aihint.ai_flags = AI_ADDRCONFIG; |
| 567 | for (i = 0; i < n; i++) { |
| 568 | parseaddr(&aihint, DA(&peerhosts)[i], 0, 0, &ailist); |
| 569 | pushaddrs(&cw.peer, ailist); |
| 570 | freeaddrinfo(ailist); |
| 571 | } |
| 572 | if (!DA_LEN(&cw.peer)) die(1, "no usable peer addresses"); |
| 573 | } |
| 574 | |
| 575 | if (connhost) { |
| 576 | aihint.ai_socktype = SOCK_STREAM; |
| 577 | aihint.ai_protocol = IPPROTO_TCP; |
| 578 | aihint.ai_flags = AI_ADDRCONFIG; |
| 579 | parseaddr(&aihint, connhost, 0, paf_parse, &ailist); |
| 580 | |
| 581 | for (ai = ailist; ai; ai = ai->ai_next) { |
| 582 | if ((fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP)) >= 0 && |
| 583 | !initsock(fd, ai->ai_family) && |
| 584 | (!DA_LEN(&bindhosts) || |
| 585 | !bind(fd, &bindaddr.sa, addrsz(&bindaddr))) && |
| 586 | !connect(fd, ai->ai_addr, ai->ai_addrlen)) |
| 587 | goto conn_tcp; |
| 588 | if (fd >= 0) close(fd); |
| 589 | } |
| 590 | die(1, "couldn't connect to TCP server: %s", strerror(errno)); |
| 591 | conn_tcp: |
| 592 | if (nonblockify(fd) || cloexec(fd)) |
| 593 | die(1, "couldn't connect to TCP server: %s", strerror(errno)); |
| 594 | } |
| 595 | |
| 596 | aihint.ai_family = af; |
| 597 | aihint.ai_socktype = SOCK_DGRAM; |
| 598 | aihint.ai_protocol = IPPROTO_UDP; |
| 599 | aihint.ai_flags = AI_ADDRCONFIG | AI_PASSIVE; |
| 600 | parseaddr(&aihint, argv[optind], 0, paf_parse, &ailist); |
| 601 | for (ai = ailist; ai && !knownafp(ai->ai_family); ai = ai->ai_next); |
| 602 | if (!ai) die(1, "no usable addresses returned for `%s'", argv[optind]); |
| 603 | if ((fd_udp = socket(ai->ai_family, SOCK_DGRAM, IPPROTO_UDP)) < 0 || |
| 604 | initsock(fd_udp, ai->ai_family) || |
| 605 | nonblockify(fd_udp) || cloexec(fd_udp) || |
| 606 | setsockopt(fd_udp, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)) || |
| 607 | setsockopt(fd_udp, SOL_SOCKET, SO_SNDBUF, &len, sizeof(len)) || |
| 608 | bind(fd_udp, ai->ai_addr, ai->ai_addrlen)) |
| 609 | die(1, "couldn't set up UDP socket: %s", strerror(errno)); |
| 610 | freeaddrinfo(ailist); |
| 611 | aihint.ai_family = ai->ai_family; |
| 612 | aihint.ai_flags = AI_ADDRCONFIG; |
| 613 | parseaddr(&aihint, argv[optind + 1], 0, paf_parse, &ailist); |
| 614 | for (ai = ailist; ai; ai = ai->ai_next) |
| 615 | if (!connect(fd_udp, ai->ai_addr, ai->ai_addrlen)) goto conn_udp; |
| 616 | die(1, "couldn't set up UDP socket: %s", strerror(errno)); |
| 617 | conn_udp: |
| 618 | |
| 619 | if (bindsvc) dolisten(); |
| 620 | else if (connhost) dofwd(fd, fd); |
| 621 | else dofwd(STDIN_FILENO, STDOUT_FILENO); |
| 622 | |
| 623 | for (;;) { |
| 624 | if (sel_select(&sel) && errno != EINTR) |
| 625 | die(1, "select failed: %s", strerror(errno)); |
| 626 | } |
| 627 | return (0); |
| 628 | } |
| 629 | |
| 630 | /*----- That's all, folks -------------------------------------------------*/ |