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Ensure that UNIX sockets are automatically unlinked upon close.
[doldaconnect.git] / daemon / net.c
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d3372da9 1/*
2 * Dolda Connect - Modular multiuser Direct Connect-style client
3 * Copyright (C) 2004 Fredrik Tolf (fredrik@dolda2000.com)
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18*/
19/* XXX: Implement SOCKS proxyability */
20
21#ifdef HAVE_CONFIG_H
22#include <config.h>
23#endif
24#include <string.h>
25#include <stdlib.h>
26#include <unistd.h>
27#include <fcntl.h>
28#include <sys/ioctl.h>
29#include <sys/socket.h>
30#include <sys/un.h>
31#include <sys/poll.h>
32#include <arpa/inet.h>
33#include <netinet/in.h>
34#include <netdb.h>
35#include <sys/signal.h>
d3372da9 36#ifdef HAVE_LINUX_SOCKIOS_H
37#include <linux/sockios.h>
38#endif
39#include <errno.h>
40#include <net/if.h>
41
42#include "conf.h"
43#include "net.h"
44#include "module.h"
45#include "log.h"
46#include "utils.h"
47#include "sysevents.h"
48
49static struct configvar myvars[] =
50{
d9f89ef5 51 /** The network mode to use. Currently supported values are 0 for
52 * active mode and 1 for passive mode. In the future, SOCKS5 proxy
53 * support may be added. */
d3372da9 54 {CONF_VAR_INT, "mode", {.num = 0}},
d9f89ef5 55 /** Set the SO_REUSEADDR socket option on listening sockets, so
56 * that dead TCP connections waiting for timeout are ignored. */
347d6d76 57 {CONF_VAR_BOOL, "reuseaddr", {.num = 0}},
d9f89ef5 58 /** Overrides the IPv4 address reported to other clients in active
59 * mode. Useful for servers behind NAT routers. If both this and
60 * net.publicif are unspecified the address of the hub connection
61 * is used. */
d3372da9 62 {CONF_VAR_IPV4, "visibleipv4", {.ipv4 = {0}}},
d9f89ef5 63 /** Specifies an interface name from which to fetch the IPv4
64 * address reported to other clients in active mode. If both this
65 * and net.visibleipv4 are unspecified the address of the hub
66 * connection is used. */
d3372da9 67 {CONF_VAR_STRING, "publicif", {.str = L""}},
b020fb3d 68 /* Diffserv should be supported on IPv4, too, but I don't know the
69 * API to do that. */
d9f89ef5 70 /** The Diffserv value to use on IPv6 connections when the
71 * minimize cost TOS value is used (see the TOS VALUES
72 * section). */
b020fb3d 73 {CONF_VAR_INT, "diffserv-mincost", {.num = 0}},
d9f89ef5 74 /** The Diffserv value to use on IPv6 connections when the
75 * maximize reliability TOS value is used (see the TOS VALUES
76 * section). */
b020fb3d 77 {CONF_VAR_INT, "diffserv-maxrel", {.num = 0}},
d9f89ef5 78 /** The Diffserv value to use on IPv6 connections when the
79 * maximize throughput TOS value is used (see the TOS VALUES
80 * section). */
b020fb3d 81 {CONF_VAR_INT, "diffserv-maxtp", {.num = 0}},
d9f89ef5 82 /** The Diffserv value to use on IPv6 connections when the
83 * minimize delay TOS value is used (see the TOS VALUES
84 * section). */
b020fb3d 85 {CONF_VAR_INT, "diffserv-mindelay", {.num = 0}},
d3372da9 86 {CONF_VAR_END}
87};
88
89static struct socket *sockets = NULL;
90int numsocks = 0;
91
92/* XXX: Get autoconf for all this... */
93int getpublicaddr(int af, struct sockaddr **addr, socklen_t *lenbuf)
94{
95 struct sockaddr_in *ipv4;
96 struct configvar *var;
97 void *bufend;
98 int sock;
99 struct ifconf conf;
100 struct ifreq *ifr, req;
101 char *pif;
102
103 if(af == AF_INET)
104 {
105 var = confgetvar("net", "visibleipv4");
106 if(var->val.ipv4.s_addr != 0)
107 {
108 ipv4 = smalloc(sizeof(*ipv4));
109 ipv4->sin_family = AF_INET;
110 ipv4->sin_addr.s_addr = var->val.ipv4.s_addr;
111 *addr = (struct sockaddr *)ipv4;
112 *lenbuf = sizeof(*ipv4);
113 return(0);
114 }
bcb73bb3 115 if((pif = icswcstombs(confgetstr("net", "publicif"), NULL, NULL)) == NULL)
d3372da9 116 {
117 flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno));
118 return(-1);
119 }
6fb0c6ac 120 if(!strcmp(pif, ""))
121 return(1);
d3372da9 122 if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
123 return(-1);
124 conf.ifc_buf = smalloc(conf.ifc_len = 65536);
125 if(ioctl(sock, SIOCGIFCONF, &conf) < 0)
126 {
127 free(conf.ifc_buf);
128 close(sock);
129 return(-1);
130 }
131 bufend = ((char *)conf.ifc_buf) + conf.ifc_len;
132 ipv4 = NULL;
133 for(ifr = conf.ifc_ifcu.ifcu_req; (void *)ifr < bufend; ifr++)
134 {
1315d02a 135 if(strcmp(ifr->ifr_name, pif))
6fb0c6ac 136 continue;
d3372da9 137 memset(&req, 0, sizeof(req));
138 memcpy(req.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
139 if(ioctl(sock, SIOCGIFFLAGS, &req) < 0)
6fb0c6ac 140 break;
141 if(!(req.ifr_flags & IFF_UP))
d3372da9 142 {
6fb0c6ac 143 flog(LOG_WARNING, "public interface is down");
144 break;
d3372da9 145 }
6fb0c6ac 146 if(ifr->ifr_addr.sa_family != AF_INET)
d3372da9 147 {
6fb0c6ac 148 flog(LOG_WARNING, "address of the public interface is not AF_INET");
149 break;
d3372da9 150 }
6fb0c6ac 151 ipv4 = smalloc(sizeof(*ipv4));
152 memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr));
153 break;
d3372da9 154 }
bcb73bb3 155 free(conf.ifc_buf);
d3372da9 156 close(sock);
157 if(ipv4 != NULL)
158 {
159 *addr = (struct sockaddr *)ipv4;
160 *lenbuf = sizeof(*ipv4);
161 return(0);
162 }
163 errno = ENETDOWN;
164 return(-1);
165 }
6fb0c6ac 166 return(1);
d3372da9 167}
168
169static struct socket *newsock(int type)
170{
171 struct socket *new;
172
173 new = smalloc(sizeof(*new));
174 new->refcount = 2;
175 new->fd = -1;
176 new->isrealsocket = 1;
177 new->family = -1;
178 new->tos = 0;
179 new->type = type;
180 new->state = -1;
181 new->ignread = 0;
182 new->close = 0;
183 new->remote = NULL;
184 new->remotelen = 0;
185 switch(type)
186 {
187 case SOCK_STREAM:
188 new->outbuf.s.buf = NULL;
189 new->outbuf.s.bufsize = 0;
190 new->outbuf.s.datasize = 0;
191 new->inbuf.s.buf = NULL;
192 new->inbuf.s.bufsize = 0;
193 new->inbuf.s.datasize = 0;
194 break;
195 case SOCK_DGRAM:
196 new->outbuf.d.f = new->outbuf.d.l = NULL;
197 new->inbuf.d.f = new->inbuf.d.l = NULL;
198 break;
199 }
cab0b442 200 new->conncb = NULL;
201 new->errcb = NULL;
202 new->readcb = NULL;
203 new->writecb = NULL;
204 new->acceptcb = NULL;
d3372da9 205 new->next = sockets;
206 new->prev = NULL;
207 if(sockets != NULL)
208 sockets->prev = new;
209 sockets = new;
210 numsocks++;
211 return(new);
212}
213
214static struct socket *mksock(int domain, int type)
215{
216 int fd;
217 struct socket *new;
218
219 if((fd = socket(domain, type, 0)) < 0)
220 {
221 flog(LOG_CRIT, "could not create socket: %s", strerror(errno));
222 return(NULL);
223 }
224 new = newsock(type);
225 new->fd = fd;
226 new->family = domain;
227 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
228 return(new);
229}
230
231struct socket *wrapsock(int fd)
232{
233 struct socket *new;
234
235 new = newsock(SOCK_STREAM);
236 new->fd = fd;
237 new->state = SOCK_EST;
238 new->isrealsocket = 0;
239 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
240 return(new);
241}
242
243static void unlinksock(struct socket *sk)
244{
245 if(sk->prev != NULL)
246 sk->prev->next = sk->next;
247 if(sk->next != NULL)
248 sk->next->prev = sk->prev;
249 if(sk == sockets)
250 sockets = sk->next;
251 putsock(sk);
252 numsocks--;
253}
254
255void getsock(struct socket *sk)
256{
257 sk->refcount++;
258}
259
260void putsock(struct socket *sk)
261{
262 struct dgrambuf *buf;
263
264 if(--(sk->refcount) == 0)
265 {
266 switch(sk->type)
267 {
268 case SOCK_STREAM:
269 if(sk->outbuf.s.buf != NULL)
270 free(sk->outbuf.s.buf);
271 if(sk->inbuf.s.buf != NULL)
272 free(sk->inbuf.s.buf);
273 break;
274 case SOCK_DGRAM:
275 while((buf = sk->outbuf.d.f) != NULL)
276 {
277 sk->outbuf.d.f = buf->next;
278 free(buf->data);
161604ea 279 free(buf->addr);
d3372da9 280 free(buf);
281 }
282 while((buf = sk->inbuf.d.f) != NULL)
283 {
284 sk->inbuf.d.f = buf->next;
285 free(buf->data);
161604ea 286 free(buf->addr);
d3372da9 287 free(buf);
288 }
289 break;
290 }
b870805e 291 closesock(sk);
d3372da9 292 if(sk->remote != NULL)
293 free(sk->remote);
294 free(sk);
295 }
296}
297
336539c2 298void sockpushdata(struct socket *sk, void *buf, size_t size)
299{
300 switch(sk->type)
301 {
302 case SOCK_STREAM:
303 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + size, 1, 1);
304 memmove(sk->inbuf.s.buf + size, sk->inbuf.s.buf, sk->inbuf.s.datasize);
305 memcpy(sk->inbuf.s.buf, buf, size);
306 sk->inbuf.s.datasize += size;
307 break;
308 case SOCK_DGRAM:
309 /* XXX */
310 break;
311 }
312 return;
313}
314
d3372da9 315void *sockgetinbuf(struct socket *sk, size_t *size)
316{
317 void *buf;
318 struct dgrambuf *dbuf;
319
320 switch(sk->type)
321 {
322 case SOCK_STREAM:
323 if((sk->inbuf.s.buf == NULL) || (sk->inbuf.s.datasize == 0))
324 {
325 *size = 0;
326 return(NULL);
327 }
328 buf = sk->inbuf.s.buf;
329 *size = sk->inbuf.s.datasize;
330 sk->inbuf.s.buf = NULL;
331 sk->inbuf.s.bufsize = sk->inbuf.s.datasize = 0;
332 return(buf);
333 case SOCK_DGRAM:
334 if((dbuf = sk->inbuf.d.f) == NULL)
335 return(NULL);
336 sk->inbuf.d.f = dbuf->next;
337 if(dbuf->next == NULL)
338 sk->inbuf.d.l = NULL;
339 buf = dbuf->data;
340 *size = dbuf->size;
341 free(dbuf->addr);
342 free(dbuf);
343 return(buf);
344 }
345 return(NULL);
346}
347
348static void sockrecv(struct socket *sk)
349{
350 int ret, inq;
351 struct dgrambuf *dbuf;
352
353 switch(sk->type)
354 {
355 case SOCK_STREAM:
356#if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
357 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
358 * how to read the inqueue size on other OSs */
359 if(ioctl(sk->fd, SIOCINQ, &inq))
360 {
361 /* I don't really know what could go wrong here, so let's
362 * assume it's transient. */
363 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), sk->fd);
364 inq = 2048;
365 }
366#else
367 inq = 2048;
368#endif
369 if(inq > 65536)
370 inq = 65536;
371 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + inq, 1, 1);
372 ret = read(sk->fd, sk->inbuf.s.buf + sk->inbuf.s.datasize, inq);
373 if(ret < 0)
374 {
375 if((errno == EINTR) || (errno == EAGAIN))
376 return;
cab0b442 377 if(sk->errcb != NULL)
378 sk->errcb(sk, errno, sk->data);
d3372da9 379 closesock(sk);
380 return;
381 }
382 if(ret == 0)
383 {
cab0b442 384 if(sk->errcb != NULL)
385 sk->errcb(sk, 0, sk->data);
d3372da9 386 closesock(sk);
387 return;
388 }
389 sk->inbuf.s.datasize += ret;
cab0b442 390 if(sk->readcb != NULL)
391 sk->readcb(sk, sk->data);
d3372da9 392 break;
393 case SOCK_DGRAM:
394 if(ioctl(sk->fd, SIOCINQ, &inq))
395 {
396 /* I don't really know what could go wrong here, so let's
397 * assume it's transient. */
398 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), sk->fd);
399 return;
400 }
401 dbuf = smalloc(sizeof(*dbuf));
402 dbuf->data = smalloc(inq);
403 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
404 ret = recvfrom(sk->fd, dbuf->data, inq, 0, dbuf->addr, &dbuf->addrlen);
405 if(ret < 0)
406 {
407 free(dbuf->addr);
408 free(dbuf->data);
409 free(dbuf);
410 if((errno == EINTR) || (errno == EAGAIN))
411 return;
cab0b442 412 if(sk->errcb != NULL)
413 sk->errcb(sk, errno, sk->data);
d3372da9 414 closesock(sk);
415 return;
416 }
417 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
418 * have EOF), but rather an empty packet. I don't know if any
419 * other potential DGRAM protocols might have an EOF
420 * condition, so let's play safe. */
421 if(ret == 0)
422 {
423 free(dbuf->addr);
424 free(dbuf->data);
425 free(dbuf);
426 if(!((sk->family == AF_INET) || (sk->family == AF_INET6)))
427 {
cab0b442 428 if(sk->errcb != NULL)
429 sk->errcb(sk, 0, sk->data);
d3372da9 430 closesock(sk);
431 }
432 return;
433 }
434 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
435 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
436 dbuf->next = NULL;
437 if(sk->inbuf.d.l != NULL)
438 sk->inbuf.d.l->next = dbuf;
439 else
440 sk->inbuf.d.f = dbuf;
441 sk->inbuf.d.l = dbuf;
cab0b442 442 if(sk->readcb != NULL)
443 sk->readcb(sk, sk->data);
d3372da9 444 break;
445 }
446}
447
448static void sockflush(struct socket *sk)
449{
450 int ret;
451 struct dgrambuf *dbuf;
452
453 switch(sk->type)
454 {
455 case SOCK_STREAM:
456 if(sk->isrealsocket)
457 ret = send(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
458 else
459 ret = write(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize);
460 if(ret < 0)
461 {
462 /* For now, assume transient error, since
463 * the socket is polled for errors */
464 break;
465 }
466 if(ret > 0)
467 {
468 memmove(sk->outbuf.s.buf, ((char *)sk->outbuf.s.buf) + ret, sk->outbuf.s.datasize -= ret);
cab0b442 469 if(sk->writecb != NULL)
470 sk->writecb(sk, sk->data);
d3372da9 471 }
472 break;
473 case SOCK_DGRAM:
474 dbuf = sk->outbuf.d.f;
475 if((sk->outbuf.d.f = dbuf->next) == NULL)
476 sk->outbuf.d.l = NULL;
477 sendto(sk->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
478 free(dbuf->data);
479 free(dbuf->addr);
480 free(dbuf);
cab0b442 481 if(sk->writecb != NULL)
482 sk->writecb(sk, sk->data);
d3372da9 483 break;
484 }
485}
486
487void closesock(struct socket *sk)
488{
b870805e 489 struct sockaddr_un *un;
490
491 if((sk->family == AF_UNIX) && !sockgetlocalname(sk, (struct sockaddr **)&un, NULL) && (un->sun_family == PF_UNIX))
492 {
493 if(strchr(un->sun_path, '/'))
494 {
495 if(unlink(un->sun_path))
496 flog(LOG_WARNING, "could not unlink UNIX socket %s: %s", un->sun_path, strerror(errno));
497 }
498 }
d3372da9 499 sk->state = SOCK_STL;
500 close(sk->fd);
501 sk->fd = -1;
502 sk->close = 0;
503}
504
505void sockqueue(struct socket *sk, void *data, size_t size)
506{
507 struct dgrambuf *new;
508
509 if(sk->state == SOCK_STL)
510 return;
511 switch(sk->type)
512 {
513 case SOCK_STREAM:
514 sizebuf(&(sk->outbuf.s.buf), &(sk->outbuf.s.bufsize), sk->outbuf.s.datasize + size, 1, 1);
515 memcpy(sk->outbuf.s.buf + sk->outbuf.s.datasize, data, size);
516 sk->outbuf.s.datasize += size;
517 break;
518 case SOCK_DGRAM:
519 if(sk->remote == NULL)
520 return;
521 new = smalloc(sizeof(*new));
522 new->next = NULL;
523 memcpy(new->data = smalloc(size), data, new->size = size);
524 memcpy(new->addr = smalloc(sk->remotelen), sk->remote, new->addrlen = sk->remotelen);
525 if(sk->outbuf.d.l == NULL)
526 {
527 sk->outbuf.d.l = sk->outbuf.d.f = new;
528 } else {
529 sk->outbuf.d.l->next = new;
530 sk->outbuf.d.l = new;
531 }
532 break;
533 }
534}
535
536size_t sockgetdatalen(struct socket *sk)
537{
538 struct dgrambuf *b;
539 size_t ret;
540
541 switch(sk->type)
542 {
543 case SOCK_STREAM:
544 ret = sk->inbuf.s.datasize;
545 break;
546 case SOCK_DGRAM:
547 ret = 0;
548 for(b = sk->inbuf.d.f; b != NULL; b = b->next)
549 ret += b->size;
550 break;
551 }
552 return(ret);
553}
554
555size_t sockqueuesize(struct socket *sk)
556{
557 struct dgrambuf *b;
558 size_t ret;
559
560 switch(sk->type)
561 {
562 case SOCK_STREAM:
563 ret = sk->outbuf.s.datasize;
564 break;
565 case SOCK_DGRAM:
566 ret = 0;
567 for(b = sk->outbuf.d.f; b != NULL; b = b->next)
568 ret += b->size;
569 break;
570 }
571 return(ret);
572}
573
d3372da9 574/*
575 * The difference between netcslisten() and netcslistenlocal() is that
576 * netcslistenlocal() always listens on the local host, instead of
577 * following proxy/passive mode directions. It is suitable for eg. the
578 * UI channel, while the file sharing networks should, naturally, use
579 * netcslisten() instead.
580*/
581
cab0b442 582struct socket *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data)
d3372da9 583{
584 struct socket *sk;
66c517d2 585 int intbuf;
d3372da9 586
587 /* I don't know if this is actually correct (it probably isn't),
588 * but since, at on least Linux systems, PF_* are specifically
589 * #define'd to their AF_* counterparts, it allows for a severely
590 * smoother implementation. If it breaks something on your
591 * platform, please tell me so.
592 */
593 if((sk = mksock(name->sa_family, type)) == NULL)
594 return(NULL);
595 sk->state = SOCK_LST;
687b2ee2 596 if(confgetint("net", "reuseaddr"))
597 {
598 intbuf = 1;
599 setsockopt(sk->fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
600 }
d3372da9 601 if(bind(sk->fd, name, namelen) < 0)
602 {
603 putsock(sk);
604 return(NULL);
605 }
606 if(listen(sk->fd, 16) < 0)
607 {
608 putsock(sk);
609 return(NULL);
610 }
cab0b442 611 sk->acceptcb = func;
612 sk->data = data;
d3372da9 613 return(sk);
614}
615
cab0b442 616struct socket *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data)
c23acc61 617{
618 if(confgetint("net", "mode") == 1)
619 {
620 errno = EOPNOTSUPP;
621 return(NULL);
622 }
c23acc61 623 if(confgetint("net", "mode") == 0)
624 return(netcslistenlocal(type, name, namelen, func, data));
625 errno = EOPNOTSUPP;
626 return(NULL);
627}
628
cab0b442 629struct socket *netcstcplisten(int port, int local, void (*func)(struct socket *, struct socket *, void *), void *data)
0a1bc5b1 630{
631 struct sockaddr_in addr;
632#ifdef HAVE_IPV6
633 struct sockaddr_in6 addr6;
634#endif
cab0b442 635 struct socket *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct socket *, struct socket *, void *), void *);
0a1bc5b1 636 struct socket *ret;
637
638 if(local)
639 csfunc = netcslistenlocal;
640 else
641 csfunc = netcslisten;
642#ifdef HAVE_IPV6
643 memset(&addr6, 0, sizeof(addr6));
644 addr6.sin6_family = AF_INET6;
645 addr6.sin6_port = htons(port);
646 addr6.sin6_addr = in6addr_any;
647 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
648 return(ret);
649 if((ret == NULL) && (errno != EAFNOSUPPORT))
650 return(NULL);
651#endif
652 memset(&addr, 0, sizeof(addr));
653 addr.sin_family = AF_INET;
654 addr.sin_port = htons(port);
655 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
656}
657
d3372da9 658struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
659{
660 struct socket *sk;
661 int mode;
662
663 mode = confgetint("net", "mode");
664 if((mode == 0) || (mode == 1))
665 {
666 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
667 return(NULL);
668 if(bind(sk->fd, name, namelen) < 0)
669 {
670 putsock(sk);
671 return(NULL);
672 }
673 sk->state = SOCK_EST;
674 return(sk);
675 }
676 errno = EOPNOTSUPP;
677 return(NULL);
678}
679
680struct socket *netdupsock(struct socket *sk)
681{
682 struct socket *newsk;
683
684 newsk = newsock(sk->type);
685 if((newsk->fd = dup(sk->fd)) < 0)
686 {
687 flog(LOG_WARNING, "could not dup() socket: %s", strerror(errno));
688 putsock(newsk);
689 return(NULL);
690 }
691 newsk->state = sk->state;
692 newsk->ignread = sk->ignread;
693 if(sk->remote != NULL)
694 memcpy(newsk->remote = smalloc(sk->remotelen), sk->remote, newsk->remotelen = sk->remotelen);
695 return(newsk);
696}
697
698void netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
699{
700 if(sk->remote != NULL)
701 free(sk->remote);
702 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
703 sk->ignread = 1;
704}
705
cab0b442 706struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
d3372da9 707{
708 struct socket *sk;
709 int mode;
710
711 mode = confgetint("net", "mode");
712 if((mode == 0) || (mode == 1))
713 {
714 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
715 return(NULL);
716 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
717 if(!connect(sk->fd, addr, addrlen))
718 {
719 sk->state = SOCK_EST;
720 func(sk, 0, data);
721 return(sk);
722 }
723 if(errno == EINPROGRESS)
724 {
725 sk->state = SOCK_SYN;
cab0b442 726 sk->conncb = func;
727 sk->data = data;
d3372da9 728 return(sk);
729 }
730 putsock(sk);
731 return(NULL);
732 }
733 errno = EOPNOTSUPP;
734 return(NULL);
735}
736
737int pollsocks(int timeout)
738{
eaa35963 739 int i, num, ret;
740 socklen_t retlen;
d3372da9 741 int newfd;
742 struct pollfd *pfds;
743 struct socket *sk, *next, *newsk;
744 struct sockaddr_storage ss;
745 socklen_t sslen;
746
747 pfds = smalloc(sizeof(*pfds) * (num = numsocks));
748 for(i = 0, sk = sockets; i < num; sk = sk->next)
749 {
750 if(sk->state == SOCK_STL)
751 {
752 num--;
753 continue;
754 }
755 pfds[i].fd = sk->fd;
756 pfds[i].events = 0;
757 if(!sk->ignread)
758 pfds[i].events |= POLLIN;
759 if((sk->state == SOCK_SYN) || (sockqueuesize(sk) > 0))
760 pfds[i].events |= POLLOUT;
761 pfds[i].revents = 0;
762 i++;
763 }
764 ret = poll(pfds, num, timeout);
765 if(ret < 0)
766 {
767 if(errno != EINTR)
768 {
769 flog(LOG_CRIT, "pollsocks: poll errored out: %s", strerror(errno));
770 /* To avoid CPU hogging in case it's bad, which it
771 * probably is. */
772 sleep(1);
773 }
774 free(pfds);
775 return(1);
776 }
777 for(sk = sockets; sk != NULL; sk = next)
778 {
779 next = sk->next;
780 for(i = 0; i < num; i++)
781 {
782 if(pfds[i].fd == sk->fd)
783 break;
784 }
785 if(i == num)
786 continue;
787 switch(sk->state)
788 {
789 case SOCK_LST:
790 if(pfds[i].revents & POLLIN)
791 {
792 sslen = sizeof(ss);
793 if((newfd = accept(sk->fd, (struct sockaddr *)&ss, &sslen)) < 0)
cab0b442 794 {
795 if(sk->errcb != NULL)
796 sk->errcb(sk, errno, sk->data);
797 }
d3372da9 798 newsk = newsock(sk->type);
799 newsk->fd = newfd;
800 newsk->family = sk->family;
801 newsk->state = SOCK_EST;
802 memcpy(newsk->remote = smalloc(sslen), &ss, sslen);
803 newsk->remotelen = sslen;
804 putsock(newsk);
cab0b442 805 if(sk->acceptcb != NULL)
806 sk->acceptcb(sk, newsk, sk->data);
d3372da9 807 }
808 if(pfds[i].revents & POLLERR)
809 {
810 retlen = sizeof(ret);
811 getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
cab0b442 812 if(sk->errcb != NULL)
813 sk->errcb(sk, ret, sk->data);
d3372da9 814 continue;
815 }
816 break;
817 case SOCK_SYN:
818 if(pfds[i].revents & POLLERR)
819 {
820 retlen = sizeof(ret);
821 getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
cab0b442 822 if(sk->conncb != NULL)
823 sk->conncb(sk, ret, sk->data);
d3372da9 824 closesock(sk);
825 continue;
826 }
827 if(pfds[i].revents & (POLLIN | POLLOUT))
828 {
829 sk->state = SOCK_EST;
cab0b442 830 if(sk->conncb != NULL)
831 sk->conncb(sk, 0, sk->data);
d3372da9 832 }
833 break;
834 case SOCK_EST:
835 if(pfds[i].revents & POLLERR)
836 {
837 retlen = sizeof(ret);
838 getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
cab0b442 839 if(sk->errcb != NULL)
840 sk->errcb(sk, ret, sk->data);
d3372da9 841 closesock(sk);
842 continue;
843 }
844 if(pfds[i].revents & POLLIN)
845 sockrecv(sk);
846 if(pfds[i].revents & POLLOUT)
847 {
848 if(sockqueuesize(sk) > 0)
849 sockflush(sk);
850 }
851 break;
852 }
853 if(pfds[i].revents & POLLNVAL)
854 {
855 flog(LOG_CRIT, "BUG: stale socket struct on fd %i", sk->fd);
856 sk->state = SOCK_STL;
857 unlinksock(sk);
858 continue;
859 }
860 if(pfds[i].revents & POLLHUP)
861 {
cab0b442 862 if(sk->errcb != NULL)
863 sk->errcb(sk, 0, sk->data);
d3372da9 864 closesock(sk);
865 unlinksock(sk);
866 continue;
867 }
868 }
869 free(pfds);
870 for(sk = sockets; sk != NULL; sk = next)
871 {
872 next = sk->next;
873 if(sk->refcount == 1 && (sockqueuesize(sk) == 0))
874 {
875 unlinksock(sk);
876 continue;
877 }
878 if(sk->close && (sockqueuesize(sk) == 0))
879 closesock(sk);
880 if(sk->state == SOCK_STL)
881 {
882 unlinksock(sk);
883 continue;
884 }
885 }
886 return(1);
887}
888
889int socksettos(struct socket *sk, int tos)
890{
b020fb3d 891 int buf;
892
d3372da9 893 if(sk->family == AF_INET)
894 {
b020fb3d 895 switch(tos)
896 {
b198bed6 897 case 0:
898 buf = 0;
899 break;
b020fb3d 900 case SOCK_TOS_MINCOST:
18c1ae1d 901 buf = 0x02;
b020fb3d 902 break;
903 case SOCK_TOS_MAXREL:
18c1ae1d 904 buf = 0x04;
b020fb3d 905 break;
906 case SOCK_TOS_MAXTP:
18c1ae1d 907 buf = 0x08;
b020fb3d 908 break;
909 case SOCK_TOS_MINDELAY:
18c1ae1d 910 buf = 0x10;
b020fb3d 911 break;
912 default:
913 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
914 return(-1);
915 }
916 if(setsockopt(sk->fd, SOL_IP, IP_TOS, &buf, sizeof(buf)) < 0)
d3372da9 917 {
918 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
919 return(-1);
920 }
921 return(0);
922 }
b020fb3d 923 if(sk->family == AF_INET6)
924 {
925 switch(tos)
926 {
b198bed6 927 case 0:
928 buf = 0;
b020fb3d 929 case SOCK_TOS_MINCOST:
930 buf = confgetint("net", "diffserv-mincost");
931 break;
932 case SOCK_TOS_MAXREL:
933 buf = confgetint("net", "diffserv-maxrel");
934 break;
935 case SOCK_TOS_MAXTP:
936 buf = confgetint("net", "diffserv-maxtp");
937 break;
938 case SOCK_TOS_MINDELAY:
939 buf = confgetint("net", "diffserv-mindelay");
940 break;
941 default:
942 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
943 return(-1);
944 }
945 /*
946 On Linux, the API IPv6 flow label management doesn't seem to
947 be entirely complete, so I guess this will have to wait.
948
949 if(setsockopt(...) < 0)
950 {
951 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
952 return(-1);
953 }
954 */
955 return(0);
956 }
d3372da9 957 flog(LOG_WARNING, "could not set TOS on sock of family %i", sk->family);
958 return(1);
959}
960
961struct resolvedata
962{
963 int fd;
964 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
965 void *data;
966 struct sockaddr_storage addr;
967 int addrlen;
968};
969
970static void resolvecb(pid_t pid, int status, struct resolvedata *data)
971{
972 static char buf[80];
973 int ret;
974 struct sockaddr_in *ipv4;
975
976 if(!status)
977 {
978 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
979 {
980 errno = ENONET;
981 data->callback(NULL, 0, data->data);
982 } else {
983 ipv4 = (struct sockaddr_in *)&data->addr;
984 memcpy(&ipv4->sin_addr, buf, 4);
985 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
986 }
987 } else {
988 errno = ENONET;
989 data->callback(NULL, 0, data->data);
990 }
991 close(data->fd);
992 free(data);
993}
994
995int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
996{
997 int i;
998 char *p;
999 int port;
1000 int pfd[2];
1001 pid_t child;
1002 struct resolvedata *rdata;
1003 struct sockaddr_in ipv4;
1004 struct hostent *he;
1005 sigset_t sigset;
1006
1007 /* IPv4 */
1008 port = -1;
1009 if((p = strchr(addr, ':')) != NULL)
1010 {
1011 *p = 0;
1012 port = atoi(p + 1);
1013 }
1014 ipv4.sin_family = AF_INET;
1015 ipv4.sin_port = htons(port);
1016 if(inet_aton(addr, &ipv4.sin_addr))
1017 {
1018 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1019 } else {
1020 sigemptyset(&sigset);
1021 sigaddset(&sigset, SIGCHLD);
1022 sigprocmask(SIG_BLOCK, &sigset, NULL);
1023 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1024 {
1025 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1026 return(-1);
1027 }
1028 if(child == 0)
1029 {
1030 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1031 for(i = 3; i < FD_SETSIZE; i++)
1032 {
1033 if(i != pfd[1])
1034 close(i);
1035 }
1036 signal(SIGALRM, SIG_DFL);
1037 alarm(30);
1038 if((he = gethostbyname(addr)) == NULL)
1039 exit(1);
1040 write(pfd[1], he->h_addr_list[0], 4);
1041 exit(0);
1042 } else {
1043 close(pfd[1]);
1044 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1045 rdata = smalloc(sizeof(*rdata));
1046 rdata->fd = pfd[0];
1047 rdata->callback = callback;
1048 rdata->data = data;
1049 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1050 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1051 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1052 return(1);
1053 }
1054 }
1055 return(0);
1056}
1057
1058int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1059{
1060 socklen_t len;
1061 struct sockaddr_storage name;
1062
1063 *namebuf = NULL;
1064 if((sk->state == SOCK_STL) || (sk->fd < 0))
1065 return(-1);
1066 len = sizeof(name);
1067 if(getsockname(sk->fd, (struct sockaddr *)&name, &len) < 0)
1068 {
6fb0c6ac 1069 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
d3372da9 1070 return(-1);
1071 }
1072 *namebuf = memcpy(smalloc(len), &name, len);
b870805e 1073 if(lenbuf != NULL)
1074 *lenbuf = len;
d3372da9 1075 return(0);
1076}
1077
eaa35963 1078static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1079{
1080 if(dst->sa_family != src->sa_family)
1081 {
1082 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1083 return;
1084 }
1085 switch(src->sa_family)
1086 {
1087 case AF_INET:
1088 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1089 break;
1090 case AF_INET6:
1091 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1092 break;
1093 default:
1094 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1095 break;
1096 }
1097}
1098
1099static int makepublic(struct sockaddr *addr)
d3372da9 1100{
6fb0c6ac 1101 int ret;
eaa35963 1102 socklen_t plen;
1103 struct sockaddr *pname;
1104
1105 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1106 {
1107 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1108 return(-1);
1109 }
1110 if(ret)
1111 return(0);
1112 sethostaddr(addr, pname);
1113 free(pname);
1114 return(0);
1115}
1116
1117int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1118{
d3372da9 1119 socklen_t len;
6fb0c6ac 1120 struct sockaddr *name;
d3372da9 1121
1122 switch(confgetint("net", "mode"))
1123 {
1124 case 0:
1125 *namebuf = NULL;
1126 if((sk->state == SOCK_STL) || (sk->fd < 0))
d3372da9 1127 {
eaa35963 1128 errno = EBADF;
d3372da9 1129 return(-1);
1130 }
6fb0c6ac 1131 if(!sockgetlocalname(sk, &name, &len))
1132 {
1133 *namebuf = name;
1134 *lenbuf = len;
eaa35963 1135 makepublic(name);
6fb0c6ac 1136 return(0);
1137 }
1138 flog(LOG_ERR, "could not get remotely accessible name by any means");
1139 return(-1);
d3372da9 1140 case 1:
1141 errno = EOPNOTSUPP;
1142 return(-1);
1143 default:
1144 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1145 errno = EOPNOTSUPP;
1146 return(-1);
1147 }
1148}
1149
d29853b1 1150int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1151{
1152 struct sockaddr *name1, *name2;
1153 socklen_t len1, len2;
1154
1155 if(sk->family != sk2->family)
1156 {
1157 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", sk->family, sk2->family);
1158 return(-1);
1159 }
3804379d 1160 if(sockgetremotename(sk, &name1, &len1))
d29853b1 1161 return(-1);
3804379d 1162 if(sockgetremotename(sk2, &name2, &len2)) {
d29853b1 1163 free(name1);
1164 return(-1);
1165 }
1166 sethostaddr(name1, name2);
1167 free(name2);
1168 *namebuf = name1;
1169 *lenbuf = len1;
1170 return(0);
1171}
1172
99a28d47 1173int addreq(struct sockaddr *x, struct sockaddr *y)
1174{
1175 struct sockaddr_un *u1, *u2;
1176 struct sockaddr_in *n1, *n2;
1177#ifdef HAVE_IPV6
1178 struct sockaddr_in6 *s1, *s2;
1179#endif
1180
1181 if(x->sa_family != y->sa_family)
1182 return(0);
1183 switch(x->sa_family) {
1184 case AF_UNIX:
1185 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1186 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1187 return(0);
1188 break;
1189 case AF_INET:
1190 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1191 if(n1->sin_port != n2->sin_port)
1192 return(0);
1193 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1194 return(0);
1195 break;
c8a729d7 1196#ifdef HAVE_IPV6
99a28d47 1197 case AF_INET6:
1198 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1199 if(s1->sin6_port != s2->sin6_port)
1200 return(0);
1201 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1202 return(0);
1203 break;
c8a729d7 1204#endif
99a28d47 1205 }
1206 return(1);
1207}
1208
d3372da9 1209char *formataddress(struct sockaddr *arg, socklen_t arglen)
1210{
1211 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1212 * lowercase letters to 1, so I do this
1213 * instead. */
1214 struct sockaddr_in *ipv4;
1215#ifdef HAVE_IPV6
1216 struct sockaddr_in6 *ipv6;
1217#endif
1218 static char *ret = NULL;
1219 char buf[1024];
1220
1221 if(ret != NULL)
1222 free(ret);
1223 ret = NULL;
1224 switch(arg->sa_family)
1225 {
1226 case AF_UNIX:
1227 UNIX = (struct sockaddr_un *)arg;
1228 ret = sprintf2("%s", UNIX->sun_path);
1229 break;
1230 case AF_INET:
1231 ipv4 = (struct sockaddr_in *)arg;
1232 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1233 return(NULL);
1234 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1235 break;
1236#ifdef HAVE_IPV6
1237 case AF_INET6:
1238 ipv6 = (struct sockaddr_in6 *)arg;
1239 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1240 return(NULL);
fc7f7735 1241 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
d3372da9 1242 break;
1243#endif
1244 default:
1245 errno = EPFNOSUPPORT;
1246 break;
1247 }
1248 return(ret);
1249}
1250
1251#if 0
1252
1253/*
1254 * It was very nice to use this, but it seems
1255 * to mess things up, so I guess it has to go... :-(
1256 */
1257
1258static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1259{
1260 struct sockaddr *arg;
1261 socklen_t arglen;
1262 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1263 * lowercase letters to 1, so I do this
1264 * instead. */
1265 struct sockaddr_in *ipv4;
1266 int ret;
1267
1268 arg = *(struct sockaddr **)(args[0]);
1269 arglen = *(socklen_t *)(args[1]);
1270 switch(arg->sa_family)
1271 {
1272 case AF_UNIX:
1273 UNIX = (struct sockaddr_un *)arg;
1274 ret = fprintf(stream, "%s", UNIX->sun_path);
1275 break;
1276 case AF_INET:
1277 ipv4 = (struct sockaddr_in *)arg;
1278 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1279 break;
1280 default:
1281 ret = -1;
1282 errno = EPFNOSUPPORT;
1283 break;
1284 }
1285 return(ret);
1286}
1287
1288static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1289{
1290 if(n > 0)
1291 argtypes[0] = PA_POINTER;
1292 if(n > 1)
1293 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1294 * be an int, so I guess this should be
1295 * safe. */
1296 return(2);
1297}
1298#endif
1299
1300static int init(int hup)
1301{
1302 if(!hup)
1303 {
1304 /*
1305 if(register_printf_function('N', formataddress, formataddress_arginfo))
1306 {
1307 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1308 return(1);
1309 }
1310 */
1311 }
1312 return(0);
1313}
1314
1315static void terminate(void)
1316{
1317 while(sockets != NULL)
1318 unlinksock(sockets);
1319}
1320
1321static struct module me =
1322{
1323 .name = "net",
1324 .conf =
1325 {
1326 .vars = myvars
1327 },
1328 .init = init,
1329 .terminate = terminate
1330};
1331
1332MODULE(me)
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