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