Commit | Line | Data |
---|---|---|
07212ba4 | 1 | /* -*-c-*- |
07212ba4 | 2 | * |
3 | * Forwarding UDP packets over a stream | |
4 | * | |
5 | * (c) 2003 Straylight/Edgeware | |
6 | */ | |
7 | ||
e04c2d50 | 8 | /*----- Licensing notice --------------------------------------------------* |
07212ba4 | 9 | * |
10 | * This file is part of Trivial IP Encryption (TrIPE). | |
11 | * | |
11ad66c2 MW |
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. | |
e04c2d50 | 16 | * |
11ad66c2 MW |
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. | |
e04c2d50 | 21 | * |
07212ba4 | 22 | * You should have received a copy of the GNU General Public License |
11ad66c2 | 23 | * along with TrIPE. If not, see <https://www.gnu.org/licenses/>. |
07212ba4 | 24 | */ |
25 | ||
07212ba4 | 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> | |
5c8525cb | 48 | #include <mLib/darray.h> |
07212ba4 | 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 | ||
23df0e5b MW |
57 | #include "util.h" |
58 | ||
07212ba4 | 59 | /*----- Data structures ---------------------------------------------------*/ |
60 | ||
5db82aca MW |
61 | typedef union addr { |
62 | struct sockaddr sa; | |
63 | struct sockaddr_in sin; | |
64 | } addr; | |
65 | ||
5c8525cb MW |
66 | DA_DECL(addr_v, addr); |
67 | DA_DECL(str_v, const char *); | |
68 | ||
07212ba4 | 69 | typedef struct pk { |
70 | struct pk *next; /* Next packet in the chain */ | |
71 | octet *p, *o; /* Buffer start and current posn */ | |
72 | size_t n; /* Size of packet remaining */ | |
73 | } pk; | |
74 | ||
75 | typedef struct pkstream { | |
76 | unsigned f; /* Flags... */ | |
77 | #define PKF_FULL 1u /* Buffer is full: stop reading */ | |
78 | sel_file r, w; /* Read and write selectors */ | |
79 | pk *pks, **pk_tail; /* Packet queue */ | |
80 | size_t npk, szpk; /* Number and size of data */ | |
81 | selpk p; /* Packet parser */ | |
82 | } pkstream; | |
83 | ||
84 | typedef struct connwait { | |
8fc71d5a MW |
85 | unsigned f; /* Various flags */ |
86 | #define cwf_port 1u /* Port is defined => listen */ | |
5c8525cb MW |
87 | sel_file *sfv; /* Selectors */ |
88 | addr_v me, peer; /* Who I'm meant to be; who peer is */ | |
07212ba4 | 89 | } connwait; |
90 | ||
91 | /*----- Static variables --------------------------------------------------*/ | |
92 | ||
93 | static sel_state sel; | |
94 | static connwait cw; | |
95 | static int fd_udp; | |
1afc65b6 | 96 | static size_t pk_nmax = 128, pk_szmax = 1024*1024; |
07212ba4 | 97 | |
98 | /*----- Main code ---------------------------------------------------------*/ | |
99 | ||
100 | static int nonblockify(int fd) | |
f98df549 | 101 | { return (fdflags(fd, O_NONBLOCK, O_NONBLOCK, 0, 0)); } |
07212ba4 | 102 | |
103 | static int cloexec(int fd) | |
f98df549 | 104 | { return (fdflags(fd, 0, 0, FD_CLOEXEC, FD_CLOEXEC)); } |
07212ba4 | 105 | |
5426c57a MW |
106 | static socklen_t addrsz(const addr *a) |
107 | { | |
108 | switch (a->sa.sa_family) { | |
109 | case AF_INET: return sizeof(a->sin); | |
110 | default: abort(); | |
111 | } | |
112 | } | |
113 | ||
114 | static const char *addrstr(const addr *a) | |
115 | { | |
116 | static char buf[128]; | |
117 | socklen_t n = sizeof(buf); | |
118 | ||
119 | if (getnameinfo(&a->sa, addrsz(a), buf, n, 0, 0, NI_NUMERICHOST)) | |
120 | return ("<addrstr failed>"); | |
121 | return (buf); | |
122 | } | |
123 | ||
124 | static int addreq(const addr *a, const addr *b) | |
125 | { | |
126 | if (a->sa.sa_family != b->sa.sa_family) return (0); | |
127 | switch (a->sa.sa_family) { | |
128 | case AF_INET: | |
129 | return (a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr); | |
130 | default: | |
131 | abort(); | |
132 | } | |
133 | } | |
134 | ||
5db82aca | 135 | static void initaddr(addr *a) |
3912d793 | 136 | { |
5db82aca MW |
137 | a->sin.sin_family = AF_INET; |
138 | a->sin.sin_addr.s_addr = INADDR_ANY; | |
139 | a->sin.sin_port = 0; | |
3912d793 MW |
140 | } |
141 | ||
07212ba4 | 142 | static void dolisten(void); |
143 | ||
144 | static void doclose(pkstream *p) | |
145 | { | |
146 | pk *pk, *ppk; | |
147 | close(p->w.fd); | |
148 | close(p->p.reader.fd); | |
149 | selpk_destroy(&p->p); | |
1afc65b6 MW |
150 | if (!(p->f&PKF_FULL)) sel_rmfile(&p->r); |
151 | if (p->npk) sel_rmfile(&p->w); | |
07212ba4 | 152 | for (pk = p->pks; pk; pk = ppk) { |
153 | ppk = pk->next; | |
154 | xfree(pk->p); | |
155 | xfree(pk); | |
156 | } | |
157 | xfree(p); | |
8fc71d5a | 158 | if (cw.f&cwf_port) dolisten(); |
1afc65b6 | 159 | else exit(0); |
07212ba4 | 160 | } |
161 | ||
162 | static void rdtcp(octet *b, size_t sz, pkbuf *pk, size_t *k, void *vp) | |
163 | { | |
164 | pkstream *p = vp; | |
165 | size_t pksz; | |
166 | ||
1afc65b6 | 167 | if (!sz) { doclose(p); return; } |
07212ba4 | 168 | pksz = LOAD16(b); |
169 | if (pksz + 2 == sz) { | |
99735357 | 170 | DISCARD(write(fd_udp, b + 2, pksz)); |
07212ba4 | 171 | selpk_want(&p->p, 2); |
172 | } else { | |
173 | selpk_want(&p->p, pksz + 2); | |
174 | *k = sz; | |
175 | } | |
176 | } | |
177 | ||
178 | static void wrtcp(int fd, unsigned mode, void *vp) | |
179 | { | |
180 | #define NPK 16 | |
181 | struct iovec iov[NPK]; | |
182 | pkstream *p = vp; | |
183 | size_t i; | |
184 | ssize_t n; | |
185 | pk *pk, *ppk; | |
186 | ||
187 | for (i = 0, pk = p->pks; i < NPK && pk; i++, pk = pk->next) { | |
188 | iov[i].iov_base = pk->o; | |
189 | iov[i].iov_len = pk->n; | |
190 | } | |
191 | ||
192 | if ((n = writev(fd, iov, i)) < 0) { | |
1afc65b6 | 193 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) return; |
07212ba4 | 194 | moan("couldn't write to TCP socket: %s", strerror(errno)); |
195 | doclose(p); | |
196 | return; | |
197 | } | |
198 | ||
199 | p->szpk -= n; | |
200 | for (pk = p->pks; n && pk; pk = ppk) { | |
201 | ppk = pk->next; | |
202 | if (pk->n <= n) { | |
203 | p->npk--; | |
204 | n -= pk->n; | |
205 | xfree(pk->p); | |
206 | xfree(pk); | |
207 | } else { | |
208 | pk->n -= n; | |
209 | pk->o += n; | |
210 | break; | |
211 | } | |
212 | } | |
213 | p->pks = pk; | |
1afc65b6 MW |
214 | if (!pk) { p->pk_tail = &p->pks; sel_rmfile(&p->w); } |
215 | if ((p->f&PKF_FULL) && p->npk < pk_nmax && p->szpk < pk_szmax) | |
216 | { p->f &= ~PKF_FULL; sel_addfile(&p->r); } | |
07212ba4 | 217 | } |
218 | ||
219 | static void rdudp(int fd, unsigned mode, void *vp) | |
220 | { | |
221 | octet buf[65536]; | |
222 | ssize_t n; | |
223 | pkstream *p = vp; | |
224 | pk *pk; | |
225 | ||
226 | if ((n = read(fd, buf, sizeof(buf))) < 0) { | |
227 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) | |
228 | return; | |
229 | moan("couldn't read from UDP socket: %s", strerror(errno)); | |
230 | return; | |
231 | } | |
232 | pk = xmalloc(sizeof(*pk)); | |
233 | pk->next = 0; | |
234 | pk->p = xmalloc(n + 2); | |
235 | STORE16(pk->p, n); | |
236 | memcpy(pk->p + 2, buf, n); | |
237 | pk->o = pk->p; | |
238 | pk->n = n + 2; | |
239 | *p->pk_tail = pk; | |
240 | p->pk_tail = &pk->next; | |
1afc65b6 | 241 | if (!p->npk) sel_addfile(&p->w); |
07212ba4 | 242 | sel_force(&p->w); |
243 | p->npk++; | |
244 | p->szpk += n + 2; | |
1afc65b6 MW |
245 | if (p->npk >= pk_nmax || p->szpk >= pk_szmax) |
246 | { sel_rmfile(&p->r); p->f |= PKF_FULL; } | |
07212ba4 | 247 | } |
248 | ||
249 | static void dofwd(int fd_in, int fd_out) | |
250 | { | |
251 | pkstream *p = xmalloc(sizeof(*p)); | |
252 | sel_initfile(&sel, &p->r, fd_udp, SEL_READ, rdudp, p); | |
253 | sel_initfile(&sel, &p->w, fd_out, SEL_WRITE, wrtcp, p); | |
254 | selpk_init(&p->p, &sel, fd_in, rdtcp, p); | |
255 | selpk_want(&p->p, 2); | |
256 | p->pks = 0; | |
257 | p->pk_tail = &p->pks; | |
258 | p->npk = p->szpk = 0; | |
259 | p->f = 0; | |
260 | sel_addfile(&p->r); | |
261 | } | |
262 | ||
263 | static void doaccept(int fd_s, unsigned mode, void *p) | |
264 | { | |
265 | int fd; | |
5db82aca MW |
266 | addr a; |
267 | socklen_t sz = sizeof(a); | |
5c8525cb | 268 | size_t i, n; |
07212ba4 | 269 | |
5db82aca | 270 | if ((fd = accept(fd_s, &a.sa, &sz)) < 0) { |
1afc65b6 | 271 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) return; |
07212ba4 | 272 | moan("couldn't accept incoming connection: %s", strerror(errno)); |
273 | return; | |
274 | } | |
5c8525cb MW |
275 | n = DA_LEN(&cw.peer); |
276 | if (!n) goto match; | |
277 | for (i = 0; i < n; i++) if (addreq(&a, &DA(&cw.peer)[i])) goto match; | |
278 | moan("rejecting connection from %s", addrstr(&a)); | |
279 | close(fd); return; | |
280 | match: | |
07212ba4 | 281 | if (nonblockify(fd) || cloexec(fd)) { |
07212ba4 | 282 | moan("couldn't accept incoming connection: %s", strerror(errno)); |
1afc65b6 | 283 | close(fd); return; |
07212ba4 | 284 | } |
285 | dofwd(fd, fd); | |
5c8525cb MW |
286 | n = DA_LEN(&cw.me); |
287 | for (i = 0; i < n; i++) { close(cw.sfv[i].fd); sel_rmfile(&cw.sfv[i]); } | |
07212ba4 | 288 | } |
289 | ||
5c8525cb | 290 | static void dolisten1(const addr *a, sel_file *sf) |
07212ba4 | 291 | { |
292 | int fd; | |
293 | int opt = 1; | |
294 | ||
5c8525cb | 295 | if ((fd = socket(a->sa.sa_family, SOCK_STREAM, IPPROTO_TCP)) < 0 || |
07212ba4 | 296 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) || |
5c8525cb | 297 | bind(fd, &a->sa, addrsz(a)) || |
07212ba4 | 298 | listen(fd, 1) || nonblockify(fd) || cloexec(fd)) |
299 | die(1, "couldn't set up listening socket: %s", strerror(errno)); | |
5c8525cb MW |
300 | sel_initfile(&sel, sf, fd, SEL_READ, doaccept, 0); |
301 | sel_addfile(sf); | |
302 | } | |
303 | ||
304 | static void dolisten(void) | |
305 | { | |
306 | size_t i, n; | |
307 | ||
308 | n = DA_LEN(&cw.me); | |
309 | for (i = 0; i < n; i++) | |
310 | dolisten1(&DA(&cw.me)[i], &cw.sfv[i]); | |
311 | } | |
312 | ||
313 | static void pushaddr(addr_v *av, const addr *a) | |
314 | { | |
315 | DA_ENSURE(av, 1); | |
316 | DA(av)[DA_LEN(av)] = *a; | |
317 | DA_EXTEND(av, 1); | |
07212ba4 | 318 | } |
319 | ||
3912d793 | 320 | #define paf_parse 1u |
5db82aca | 321 | static void parseaddr(const char *host, const char *svc, unsigned f, addr *a) |
07212ba4 | 322 | { |
3912d793 | 323 | char *alloc = 0, *sep; |
1afc65b6 MW |
324 | struct hostent *h; |
325 | struct servent *s; | |
326 | char *qq; | |
327 | unsigned long n; | |
328 | ||
3912d793 MW |
329 | if (f&paf_parse) { |
330 | alloc = xstrdup(host); | |
331 | if ((sep = strchr(alloc, ':')) == 0) | |
332 | die(1, "missing port number in address `%s'", host); | |
333 | host = alloc; *sep = 0; svc = sep + 1; | |
07212ba4 | 334 | } |
335 | ||
3912d793 MW |
336 | if (host) { |
337 | if ((h = gethostbyname(host)) == 0) die(1, "unknown host `%s'", host); | |
5db82aca | 338 | memcpy(&a->sin.sin_addr, h->h_addr, sizeof(a->sin.sin_addr)); |
07212ba4 | 339 | } |
340 | ||
3912d793 MW |
341 | if (svc) { |
342 | if ((n = strtoul(svc, &qq, 0)) > 0 && !*qq && n <= 0xffff) | |
5db82aca | 343 | a->sin.sin_port = htons(n); |
3912d793 | 344 | else if ((s = getservbyname(svc, "tcp")) != 0) |
5db82aca | 345 | a->sin.sin_port = s->s_port; |
3912d793 MW |
346 | else |
347 | die(1, "bad service name/number `%s'", svc); | |
07212ba4 | 348 | } |
3912d793 MW |
349 | |
350 | xfree(alloc); | |
07212ba4 | 351 | } |
352 | ||
353 | static void usage(FILE *fp) | |
354 | { | |
355 | pquis(fp, | |
ef4a1ab7 | 356 | "Usage: $ [-l PORT] [-b ADDR] [-p ADDR] [-c ADDR:PORT]\n\ |
357 | ADDR:PORT ADDR:PORT\n"); | |
07212ba4 | 358 | } |
359 | ||
360 | static void version(FILE *fp) | |
f98df549 | 361 | { pquis(fp, "$, tripe version " VERSION "\n"); } |
07212ba4 | 362 | |
363 | static void help(FILE *fp) | |
364 | { | |
365 | version(fp); | |
366 | fputc('\n', fp); | |
367 | usage(fp); | |
368 | fputs("\n\ | |
369 | Options:\n\ | |
370 | \n\ | |
371 | -h, --help Display this help text.\n\ | |
372 | -v, --version Display version number.\n\ | |
373 | -u, --usage Display pointless usage message.\n\ | |
374 | \n\ | |
375 | -l, --listen=PORT Listen for connections to TCP PORT.\n\ | |
ef4a1ab7 | 376 | -p, --peer=ADDR Only accept connections from IP ADDR.\n\ |
377 | -b, --bind=ADDR Bind to ADDR before connecting.\n\ | |
07212ba4 | 378 | -c, --connect=ADDR:PORT Connect to IP ADDR, TCP PORT.\n\ |
379 | \n\ | |
380 | Forwards UDP packets over a reliable stream. By default, uses stdin and\n\ | |
381 | stdout; though it can use TCP sockets instead.\n\ | |
382 | ", fp); | |
383 | } | |
384 | ||
385 | int main(int argc, char *argv[]) | |
386 | { | |
387 | unsigned f = 0; | |
5c8525cb MW |
388 | str_v bindhosts = DA_INIT, peerhosts = DA_INIT; |
389 | const char *bindsvc = 0; | |
5db82aca | 390 | addr bindaddr; |
3912d793 | 391 | const char *connhost = 0; |
5db82aca | 392 | addr tmpaddr; |
3912d793 | 393 | int fd = -1; |
07212ba4 | 394 | int len = 65536; |
5c8525cb | 395 | size_t i, n; |
07212ba4 | 396 | |
397 | #define f_bogus 1u | |
398 | ||
8fc71d5a MW |
399 | cw.f = 0; |
400 | ||
07212ba4 | 401 | ego(argv[0]); |
07212ba4 | 402 | sel_init(&sel); |
403 | for (;;) { | |
404 | static struct option opt[] = { | |
405 | { "help", 0, 0, 'h' }, | |
406 | { "version", 0, 0, 'v' }, | |
407 | { "usage", 0, 0, 'u' }, | |
408 | { "listen", OPTF_ARGREQ, 0, 'l' }, | |
409 | { "peer", OPTF_ARGREQ, 0, 'p' }, | |
ef4a1ab7 | 410 | { "bind", OPTF_ARGREQ, 0, 'b' }, |
07212ba4 | 411 | { "connect", OPTF_ARGREQ, 0, 'c' }, |
412 | { 0, 0, 0, 0 } | |
413 | }; | |
414 | int i; | |
415 | ||
ef4a1ab7 | 416 | i = mdwopt(argc, argv, "hvul:p:b:c:", opt, 0, 0, 0); |
07212ba4 | 417 | if (i < 0) |
418 | break; | |
419 | switch (i) { | |
1afc65b6 MW |
420 | case 'h': help(stdout); exit(0); |
421 | case 'v': version(stdout); exit(0); | |
422 | case 'u': usage(stdout); exit(0); | |
3912d793 | 423 | case 'l': bindsvc = optarg; break; |
5c8525cb MW |
424 | case 'p': DA_PUSH(&peerhosts, optarg); break; |
425 | case 'b': DA_PUSH(&bindhosts, optarg); break; | |
3912d793 | 426 | case 'c': connhost = optarg; break; |
1afc65b6 | 427 | default: f |= f_bogus; break; |
07212ba4 | 428 | } |
429 | } | |
1afc65b6 | 430 | if (optind + 2 != argc || (f&f_bogus)) { usage(stderr); exit(1); } |
07212ba4 | 431 | |
5c8525cb | 432 | if (DA_LEN(&bindhosts) && !bindsvc && !connhost) |
3912d793 | 433 | die(1, "bind addr only makes sense when listening or connecting"); |
5c8525cb | 434 | if (DA_LEN(&peerhosts) && !bindsvc) |
3912d793 MW |
435 | die(1, "peer addr only makes sense when listening"); |
436 | if (bindsvc && connhost) | |
437 | die(1, "can't listen and connect"); | |
438 | ||
5c8525cb MW |
439 | DA_CREATE(&cw.me); DA_CREATE(&cw.peer); |
440 | ||
441 | n = DA_LEN(&bindhosts); | |
442 | if (n || bindsvc) { | |
443 | if (!n) { | |
444 | initaddr(&tmpaddr); | |
445 | parseaddr(0, bindsvc, 0, &tmpaddr); | |
446 | pushaddr(&cw.me, &tmpaddr); | |
447 | } else if (!bindsvc) { | |
448 | if (n != 1) die(1, "can only bind to one address as client"); | |
449 | initaddr(&bindaddr); | |
450 | parseaddr(DA(&bindhosts)[0], 0, 0, &bindaddr); | |
451 | } else for (i = 0; i < n; i++) { | |
452 | initaddr(&tmpaddr); | |
453 | parseaddr(DA(&bindhosts)[i], bindsvc, 0, &tmpaddr); | |
454 | pushaddr(&cw.me, &tmpaddr); | |
455 | } | |
456 | if (bindsvc) { | |
8fc71d5a | 457 | cw.f |= cwf_port; |
5c8525cb MW |
458 | n = DA_LEN(&cw.me); |
459 | cw.sfv = xmalloc(n*sizeof(*cw.sfv)); | |
8fc71d5a | 460 | } |
3912d793 MW |
461 | } |
462 | ||
5c8525cb MW |
463 | n = DA_LEN(&peerhosts); |
464 | if (n) { | |
465 | for (i = 0; i < n; i++) { | |
466 | initaddr(&tmpaddr); | |
467 | parseaddr(DA(&peerhosts)[0], 0, 0, &tmpaddr); | |
468 | pushaddr(&cw.peer, &tmpaddr); | |
469 | } | |
470 | } | |
07212ba4 | 471 | |
3912d793 MW |
472 | if (connhost) { |
473 | initaddr(&tmpaddr); | |
474 | parseaddr(connhost, 0, paf_parse, &tmpaddr); | |
b31421b9 | 475 | if ((fd = socket(tmpaddr.sa.sa_family, SOCK_STREAM, IPPROTO_TCP)) < 0 || |
5c8525cb | 476 | (DA_LEN(&bindhosts) && |
5426c57a MW |
477 | bind(fd, &bindaddr.sa, addrsz(&bindaddr))) || |
478 | connect(fd, &tmpaddr.sa, addrsz(&tmpaddr))) | |
3912d793 MW |
479 | die(1, "couldn't connect to TCP server: %s", strerror(errno)); |
480 | if (nonblockify(fd) || cloexec(fd)) | |
481 | die(1, "couldn't connect to TCP server: %s", strerror(errno)); | |
482 | } | |
483 | ||
484 | initaddr(&tmpaddr); | |
485 | parseaddr(argv[optind], 0, paf_parse, &tmpaddr); | |
b31421b9 | 486 | if ((fd_udp = socket(tmpaddr.sa.sa_family, SOCK_DGRAM, IPPROTO_UDP)) < 0 || |
3912d793 | 487 | nonblockify(fd_udp) || cloexec(fd_udp) || |
07212ba4 | 488 | setsockopt(fd_udp, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)) || |
489 | setsockopt(fd_udp, SOL_SOCKET, SO_SNDBUF, &len, sizeof(len)) || | |
5426c57a | 490 | bind(fd_udp, &tmpaddr.sa, addrsz(&tmpaddr))) |
3912d793 MW |
491 | die(1, "couldn't set up UDP socket: %s", strerror(errno)); |
492 | initaddr(&tmpaddr); | |
493 | parseaddr(argv[optind + 1], 0, paf_parse, &tmpaddr); | |
5426c57a | 494 | if (connect(fd_udp, &tmpaddr.sa, addrsz(&tmpaddr))) |
07212ba4 | 495 | die(1, "couldn't set up UDP socket: %s", strerror(errno)); |
496 | ||
3912d793 MW |
497 | if (bindsvc) dolisten(); |
498 | else if (connhost) dofwd(fd, fd); | |
499 | else dofwd(STDIN_FILENO, STDOUT_FILENO); | |
07212ba4 | 500 | |
c14225f6 MW |
501 | for (;;) { |
502 | if (sel_select(&sel) && errno != EINTR) | |
503 | die(1, "select failed: %s", strerror(errno)); | |
504 | } | |
07212ba4 | 505 | return (0); |
506 | } | |
507 | ||
508 | /*----- That's all, folks -------------------------------------------------*/ |