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Merge branch 'master' of pc18:/srv/git/r/doldaconnect
[doldaconnect.git] / daemon / net.c
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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/select.h>
32#include <arpa/inet.h>
33#include <netinet/in.h>
34#include <netdb.h>
35#include <sys/signal.h>
36#include <sys/stat.h> /* For rebindunix() */
37#ifdef HAVE_LINUX_SOCKIOS_H
38#include <linux/sockios.h>
39#endif
40#include <errno.h>
41#include <net/if.h>
42
43#include "conf.h"
44#include "net.h"
45#include "module.h"
46#include "log.h"
47#include "utils.h"
48#include "sysevents.h"
49
50static struct configvar myvars[] =
51{
52 /** The network mode to use. Currently supported values are 0 for
53 * active mode and 1 for passive mode. In the future, SOCKS5 proxy
54 * support may be added. */
55 {CONF_VAR_INT, "mode", {.num = 0}},
56 /** Set the SO_REUSEADDR socket option on listening sockets, so
57 * that dead TCP connections waiting for timeout are ignored. */
58 {CONF_VAR_BOOL, "reuseaddr", {.num = 0}},
59 /** Overrides the IPv4 address reported to other clients in active
60 * mode. Useful for servers behind NAT routers. If both this and
61 * net.publicif are unspecified the address of the hub connection
62 * is used. */
63 {CONF_VAR_IPV4, "visibleipv4", {.ipv4 = {0}}},
64 /** Specifies an interface name from which to fetch the IPv4
65 * address reported to other clients in active mode. If both this
66 * and net.visibleipv4 are unspecified the address of the hub
67 * connection is used. */
68 {CONF_VAR_STRING, "publicif", {.str = L""}},
69 /* Diffserv should be supported on IPv4, too, but I don't know the
70 * API to do that. */
71 /** The Diffserv value to use on IPv6 connections when the
72 * minimize cost TOS value is used (see the TOS VALUES
73 * section). */
74 {CONF_VAR_INT, "diffserv-mincost", {.num = 0}},
75 /** The Diffserv value to use on IPv6 connections when the
76 * maximize reliability TOS value is used (see the TOS VALUES
77 * section). */
78 {CONF_VAR_INT, "diffserv-maxrel", {.num = 0}},
79 /** The Diffserv value to use on IPv6 connections when the
80 * maximize throughput TOS value is used (see the TOS VALUES
81 * section). */
82 {CONF_VAR_INT, "diffserv-maxtp", {.num = 0}},
83 /** The Diffserv value to use on IPv6 connections when the
84 * minimize delay TOS value is used (see the TOS VALUES
85 * section). */
86 {CONF_VAR_INT, "diffserv-mindelay", {.num = 0}},
87 {CONF_VAR_END}
88};
89
90static struct socket *sockets = NULL;
91int numsocks = 0;
92
93/* XXX: Get autoconf for all this... */
94int getpublicaddr(int af, struct sockaddr **addr, socklen_t *lenbuf)
95{
96 struct sockaddr_in *ipv4;
97 struct configvar *var;
98 void *bufend;
99 int sock;
100 struct ifconf conf;
101 struct ifreq *ifr, req;
102 char *pif;
103
104 if(af == AF_INET)
105 {
106 var = confgetvar("net", "visibleipv4");
107 if(var->val.ipv4.s_addr != 0)
108 {
109 ipv4 = smalloc(sizeof(*ipv4));
110 ipv4->sin_family = AF_INET;
111 ipv4->sin_addr.s_addr = var->val.ipv4.s_addr;
112 *addr = (struct sockaddr *)ipv4;
113 *lenbuf = sizeof(*ipv4);
114 return(0);
115 }
116 if((pif = icswcstombs(confgetstr("net", "publicif"), NULL, NULL)) == NULL)
117 {
118 flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno));
119 return(-1);
120 }
121 if(!strcmp(pif, ""))
122 return(1);
123 if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
124 return(-1);
125 conf.ifc_buf = smalloc(conf.ifc_len = 65536);
126 if(ioctl(sock, SIOCGIFCONF, &conf) < 0)
127 {
128 free(conf.ifc_buf);
129 close(sock);
130 return(-1);
131 }
132 bufend = ((char *)conf.ifc_buf) + conf.ifc_len;
133 ipv4 = NULL;
134 for(ifr = conf.ifc_ifcu.ifcu_req; (void *)ifr < bufend; ifr++)
135 {
136 if(strcmp(ifr->ifr_name, pif))
137 continue;
138 memset(&req, 0, sizeof(req));
139 memcpy(req.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
140 if(ioctl(sock, SIOCGIFFLAGS, &req) < 0)
141 break;
142 if(!(req.ifr_flags & IFF_UP))
143 {
144 flog(LOG_WARNING, "public interface is down");
145 break;
146 }
147 if(ifr->ifr_addr.sa_family != AF_INET)
148 {
149 flog(LOG_WARNING, "address of the public interface is not AF_INET");
150 break;
151 }
152 ipv4 = smalloc(sizeof(*ipv4));
153 memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr));
154 break;
155 }
156 free(conf.ifc_buf);
157 close(sock);
158 if(ipv4 != NULL)
159 {
160 *addr = (struct sockaddr *)ipv4;
161 *lenbuf = sizeof(*ipv4);
162 return(0);
163 }
164 errno = ENETDOWN;
165 return(-1);
166 }
167 return(1);
168}
169
170static struct socket *newsock(int type)
171{
172 struct socket *new;
173
174 new = smalloc(sizeof(*new));
175 new->refcount = 2;
176 new->fd = -1;
177 new->isrealsocket = 1;
178 new->family = -1;
179 new->tos = 0;
180 new->type = type;
181 new->state = -1;
182 new->ignread = 0;
183 new->close = 0;
184 new->remote = NULL;
185 new->remotelen = 0;
186 new->ucred.uid = -1;
187 new->ucred.gid = -1;
188 switch(type)
189 {
190 case SOCK_STREAM:
191 new->outbuf.s.buf = NULL;
192 new->outbuf.s.bufsize = 0;
193 new->outbuf.s.datasize = 0;
194 new->inbuf.s.buf = NULL;
195 new->inbuf.s.bufsize = 0;
196 new->inbuf.s.datasize = 0;
197 break;
198 case SOCK_DGRAM:
199 new->outbuf.d.f = new->outbuf.d.l = NULL;
200 new->inbuf.d.f = new->inbuf.d.l = NULL;
201 break;
202 }
203 new->conncb = NULL;
204 new->errcb = NULL;
205 new->readcb = NULL;
206 new->writecb = NULL;
207 new->acceptcb = NULL;
208 new->next = sockets;
209 new->prev = NULL;
210 if(sockets != NULL)
211 sockets->prev = new;
212 sockets = new;
213 numsocks++;
214 return(new);
215}
216
217static struct socket *mksock(int domain, int type)
218{
219 int fd;
220 struct socket *new;
221
222 if((fd = socket(domain, type, 0)) < 0)
223 {
224 flog(LOG_CRIT, "could not create socket: %s", strerror(errno));
225 return(NULL);
226 }
227 new = newsock(type);
228 new->fd = fd;
229 new->family = domain;
230 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
231 return(new);
232}
233
234struct socket *wrapsock(int fd)
235{
236 struct socket *new;
237
238 new = newsock(SOCK_STREAM);
239 new->fd = fd;
240 new->state = SOCK_EST;
241 new->isrealsocket = 0;
242 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
243 return(new);
244}
245
246static void unlinksock(struct socket *sk)
247{
248 if(sk->prev != NULL)
249 sk->prev->next = sk->next;
250 if(sk->next != NULL)
251 sk->next->prev = sk->prev;
252 if(sk == sockets)
253 sockets = sk->next;
254 putsock(sk);
255 numsocks--;
256}
257
258void getsock(struct socket *sk)
259{
260 sk->refcount++;
261}
262
263void putsock(struct socket *sk)
264{
265 struct dgrambuf *buf;
266
267 if(--(sk->refcount) == 0)
268 {
269 switch(sk->type)
270 {
271 case SOCK_STREAM:
272 if(sk->outbuf.s.buf != NULL)
273 free(sk->outbuf.s.buf);
274 if(sk->inbuf.s.buf != NULL)
275 free(sk->inbuf.s.buf);
276 break;
277 case SOCK_DGRAM:
278 while((buf = sk->outbuf.d.f) != NULL)
279 {
280 sk->outbuf.d.f = buf->next;
281 free(buf->data);
282 free(buf->addr);
283 free(buf);
284 }
285 while((buf = sk->inbuf.d.f) != NULL)
286 {
287 sk->inbuf.d.f = buf->next;
288 free(buf->data);
289 free(buf->addr);
290 free(buf);
291 }
292 break;
293 }
294 closesock(sk);
295 if(sk->remote != NULL)
296 free(sk->remote);
297 free(sk);
298 }
299}
300
301void sockpushdata(struct socket *sk, void *buf, size_t size)
302{
303 switch(sk->type)
304 {
305 case SOCK_STREAM:
306 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + size, 1, 1);
307 memmove(sk->inbuf.s.buf + size, sk->inbuf.s.buf, sk->inbuf.s.datasize);
308 memcpy(sk->inbuf.s.buf, buf, size);
309 sk->inbuf.s.datasize += size;
310 break;
311 case SOCK_DGRAM:
312 /* XXX */
313 break;
314 }
315 return;
316}
317
318void *sockgetinbuf(struct socket *sk, size_t *size)
319{
320 void *buf;
321 struct dgrambuf *dbuf;
322
323 switch(sk->type)
324 {
325 case SOCK_STREAM:
326 if((sk->inbuf.s.buf == NULL) || (sk->inbuf.s.datasize == 0))
327 {
328 *size = 0;
329 return(NULL);
330 }
331 buf = sk->inbuf.s.buf;
332 *size = sk->inbuf.s.datasize;
333 sk->inbuf.s.buf = NULL;
334 sk->inbuf.s.bufsize = sk->inbuf.s.datasize = 0;
335 return(buf);
336 case SOCK_DGRAM:
337 if((dbuf = sk->inbuf.d.f) == NULL)
338 return(NULL);
339 sk->inbuf.d.f = dbuf->next;
340 if(dbuf->next == NULL)
341 sk->inbuf.d.l = NULL;
342 buf = dbuf->data;
343 *size = dbuf->size;
344 free(dbuf->addr);
345 free(dbuf);
346 return(buf);
347 }
348 return(NULL);
349}
350
351static void recvcmsg(struct socket *sk, struct msghdr *msg)
352{
353 struct cmsghdr *cmsg;
354
355 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
356 {
357#if UNIX_AUTH_STYLE == 1
358 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
359 {
360 struct ucred *cred;
361 if(sk->ucred.uid == -1)
362 {
363 cred = (struct ucred *)CMSG_DATA(cmsg);
364 sk->ucred.uid = cred->uid;
365 sk->ucred.gid = cred->gid;
366 }
367 }
368#endif
369 }
370}
371
372static void sockrecv(struct socket *sk)
373{
374 int ret, inq;
375 struct dgrambuf *dbuf;
376 struct msghdr msg;
377 char cbuf[65536];
378 struct iovec bufvec;
379
380 memset(&msg, 0, sizeof(msg));
381 msg.msg_iov = &bufvec;
382 msg.msg_iovlen = 1;
383 msg.msg_control = cbuf;
384 msg.msg_controllen = sizeof(cbuf);
385 switch(sk->type)
386 {
387 case SOCK_STREAM:
388#if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
389 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
390 * how to read the inqueue size on other OSs */
391 if(sk->isrealsocket) {
392 if(ioctl(sk->fd, SIOCINQ, &inq))
393 {
394 /* I don't really know what could go wrong here, so let's
395 * assume it's transient. */
396 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), sk->fd);
397 inq = 2048;
398 }
399 } else {
400 /* There are perils when trying to use SIOCINQ on files >2GiB... */
401 inq = 65536;
402 }
403#else
404 inq = 2048;
405#endif
406 if(inq > 65536)
407 inq = 65536;
408 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + inq, 1, 1);
409 if(sk->isrealsocket)
410 {
411 bufvec.iov_base = sk->inbuf.s.buf + sk->inbuf.s.datasize;
412 bufvec.iov_len = inq;
413 ret = recvmsg(sk->fd, &msg, 0);
414 } else {
415 ret = read(sk->fd, sk->inbuf.s.buf + sk->inbuf.s.datasize, inq);
416 msg.msg_controllen = 0;
417 msg.msg_flags = 0;
418 }
419 if(ret < 0)
420 {
421 if((errno == EINTR) || (errno == EAGAIN))
422 return;
423 if(sk->errcb != NULL)
424 sk->errcb(sk, errno, sk->data);
425 closesock(sk);
426 return;
427 }
428 if(msg.msg_flags & MSG_CTRUNC)
429 flog(LOG_DEBUG, "ancillary data was truncated");
430 else
431 recvcmsg(sk, &msg);
432 if(ret == 0)
433 {
434 if(sk->errcb != NULL)
435 sk->errcb(sk, 0, sk->data);
436 closesock(sk);
437 return;
438 }
439 sk->inbuf.s.datasize += ret;
440 if(sk->readcb != NULL)
441 sk->readcb(sk, sk->data);
442 break;
443 case SOCK_DGRAM:
444#if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
445 if(ioctl(sk->fd, SIOCINQ, &inq))
446 {
447 /* I don't really know what could go wrong here, so let's
448 * assume it's transient. */
449 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), sk->fd);
450 return;
451 }
452#else
453 inq = 65536;
454#endif
455 dbuf = smalloc(sizeof(*dbuf));
456 dbuf->data = smalloc(inq);
457 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
458 /*
459 ret = recvfrom(sk->fd, dbuf->data, inq, 0, dbuf->addr, &dbuf->addrlen);
460 */
461 msg.msg_name = dbuf->addr;
462 msg.msg_namelen = dbuf->addrlen;
463 bufvec.iov_base = dbuf->data;
464 bufvec.iov_len = inq;
465 ret = recvmsg(sk->fd, &msg, 0);
466 dbuf->addrlen = msg.msg_namelen;
467 if(ret < 0)
468 {
469 free(dbuf->addr);
470 free(dbuf->data);
471 free(dbuf);
472 if((errno == EINTR) || (errno == EAGAIN))
473 return;
474 if(sk->errcb != NULL)
475 sk->errcb(sk, errno, sk->data);
476 closesock(sk);
477 return;
478 }
479 if(msg.msg_flags & MSG_CTRUNC)
480 flog(LOG_DEBUG, "ancillary data was truncated");
481 else
482 recvcmsg(sk, &msg);
483 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
484 * have EOF), but rather an empty packet. I don't know if any
485 * other potential DGRAM protocols might have an EOF
486 * condition, so let's play safe. */
487 if(ret == 0)
488 {
489 free(dbuf->addr);
490 free(dbuf->data);
491 free(dbuf);
492 if(!((sk->family == AF_INET) || (sk->family == AF_INET6)))
493 {
494 if(sk->errcb != NULL)
495 sk->errcb(sk, 0, sk->data);
496 closesock(sk);
497 }
498 return;
499 }
500 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
501 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
502 dbuf->next = NULL;
503 if(sk->inbuf.d.l != NULL)
504 sk->inbuf.d.l->next = dbuf;
505 else
506 sk->inbuf.d.f = dbuf;
507 sk->inbuf.d.l = dbuf;
508 if(sk->readcb != NULL)
509 sk->readcb(sk, sk->data);
510 break;
511 }
512}
513
514static void sockflush(struct socket *sk)
515{
516 int ret;
517 struct dgrambuf *dbuf;
518
519 switch(sk->type)
520 {
521 case SOCK_STREAM:
522 if(sk->isrealsocket)
523 ret = send(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
524 else
525 ret = write(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize);
526 if(ret < 0)
527 {
528 /* For now, assume transient error, since
529 * the socket is polled for errors */
530 break;
531 }
532 if(ret > 0)
533 {
534 memmove(sk->outbuf.s.buf, ((char *)sk->outbuf.s.buf) + ret, sk->outbuf.s.datasize -= ret);
535 if(sk->writecb != NULL)
536 sk->writecb(sk, sk->data);
537 }
538 break;
539 case SOCK_DGRAM:
540 dbuf = sk->outbuf.d.f;
541 if((sk->outbuf.d.f = dbuf->next) == NULL)
542 sk->outbuf.d.l = NULL;
543 sendto(sk->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
544 free(dbuf->data);
545 free(dbuf->addr);
546 free(dbuf);
547 if(sk->writecb != NULL)
548 sk->writecb(sk, sk->data);
549 break;
550 }
551}
552
553void closesock(struct socket *sk)
554{
555 struct sockaddr_un *un;
556
557 if((sk->family == AF_UNIX) && !sockgetlocalname(sk, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX))
558 {
559 if((sk->state == SOCK_LST) && strchr(un->sun_path, '/'))
560 {
561 if(unlink(un->sun_path))
562 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
563 }
564 }
565 sk->state = SOCK_STL;
566 close(sk->fd);
567 sk->fd = -1;
568 sk->close = 0;
569}
570
571void sockqueue(struct socket *sk, void *data, size_t size)
572{
573 struct dgrambuf *new;
574
575 if(sk->state == SOCK_STL)
576 return;
577 switch(sk->type)
578 {
579 case SOCK_STREAM:
580 sizebuf(&(sk->outbuf.s.buf), &(sk->outbuf.s.bufsize), sk->outbuf.s.datasize + size, 1, 1);
581 memcpy(sk->outbuf.s.buf + sk->outbuf.s.datasize, data, size);
582 sk->outbuf.s.datasize += size;
583 break;
584 case SOCK_DGRAM:
585 if(sk->remote == NULL)
586 return;
587 new = smalloc(sizeof(*new));
588 new->next = NULL;
589 memcpy(new->data = smalloc(size), data, new->size = size);
590 memcpy(new->addr = smalloc(sk->remotelen), sk->remote, new->addrlen = sk->remotelen);
591 if(sk->outbuf.d.l == NULL)
592 {
593 sk->outbuf.d.l = sk->outbuf.d.f = new;
594 } else {
595 sk->outbuf.d.l->next = new;
596 sk->outbuf.d.l = new;
597 }
598 break;
599 }
600}
601
602size_t sockgetdatalen(struct socket *sk)
603{
604 struct dgrambuf *b;
605 size_t ret;
606
607 switch(sk->type)
608 {
609 case SOCK_STREAM:
610 ret = sk->inbuf.s.datasize;
611 break;
612 case SOCK_DGRAM:
613 ret = 0;
614 for(b = sk->inbuf.d.f; b != NULL; b = b->next)
615 ret += b->size;
616 break;
617 }
618 return(ret);
619}
620
621size_t sockqueuesize(struct socket *sk)
622{
623 struct dgrambuf *b;
624 size_t ret;
625
626 switch(sk->type)
627 {
628 case SOCK_STREAM:
629 ret = sk->outbuf.s.datasize;
630 break;
631 case SOCK_DGRAM:
632 ret = 0;
633 for(b = sk->outbuf.d.f; b != NULL; b = b->next)
634 ret += b->size;
635 break;
636 }
637 return(ret);
638}
639
640/*
641 * Seriously, I don't know if it's naughty or not to remove
642 * pre-existing Unix sockets.
643 */
644static int rebindunix(struct socket *sk, struct sockaddr *name, socklen_t namelen)
645{
646 struct sockaddr_un *un;
647 struct stat sb;
648
649 if((sk->family != AF_UNIX) || (name->sa_family != PF_UNIX))
650 return(-1);
651 un = (struct sockaddr_un *)name;
652 if(stat(un->sun_path, &sb))
653 return(-1);
654 if(!S_ISSOCK(sb.st_mode))
655 return(-1);
656 if(unlink(un->sun_path))
657 return(-1);
658 if(bind(sk->fd, name, namelen) < 0)
659 return(-1);
660 return(0);
661}
662
663/*
664 * The difference between netcslisten() and netcslistenlocal() is that
665 * netcslistenlocal() always listens on the local host, instead of
666 * following proxy/passive mode directions. It is suitable for eg. the
667 * UI channel, while the file sharing networks should, naturally, use
668 * netcslisten() instead.
669*/
670
671struct socket *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data)
672{
673 struct socket *sk;
674 int intbuf;
675
676 /* I don't know if this is actually correct (it probably isn't),
677 * but since, at on least Linux systems, PF_* are specifically
678 * #define'd to their AF_* counterparts, it allows for a severely
679 * smoother implementation. If it breaks something on your
680 * platform, please tell me so.
681 */
682 if((sk = mksock(name->sa_family, type)) == NULL)
683 return(NULL);
684 sk->state = SOCK_LST;
685 if(confgetint("net", "reuseaddr"))
686 {
687 intbuf = 1;
688 setsockopt(sk->fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
689 }
690 if((bind(sk->fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(sk, name, namelen) < 0)))
691 {
692 putsock(sk);
693 return(NULL);
694 }
695 if(listen(sk->fd, 16) < 0)
696 {
697 putsock(sk);
698 return(NULL);
699 }
700 sk->acceptcb = func;
701 sk->data = data;
702 return(sk);
703}
704
705struct socket *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data)
706{
707 if(confgetint("net", "mode") == 1)
708 {
709 errno = EOPNOTSUPP;
710 return(NULL);
711 }
712 if(confgetint("net", "mode") == 0)
713 return(netcslistenlocal(type, name, namelen, func, data));
714 errno = EOPNOTSUPP;
715 return(NULL);
716}
717
718struct socket *netcstcplisten(int port, int local, void (*func)(struct socket *, struct socket *, void *), void *data)
719{
720 struct sockaddr_in addr;
721#ifdef HAVE_IPV6
722 struct sockaddr_in6 addr6;
723#endif
724 struct socket *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct socket *, struct socket *, void *), void *);
725 struct socket *ret;
726
727 if(local)
728 csfunc = netcslistenlocal;
729 else
730 csfunc = netcslisten;
731#ifdef HAVE_IPV6
732 memset(&addr6, 0, sizeof(addr6));
733 addr6.sin6_family = AF_INET6;
734 addr6.sin6_port = htons(port);
735 addr6.sin6_addr = in6addr_any;
736 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
737 return(ret);
738 if((ret == NULL) && (errno != EAFNOSUPPORT))
739 return(NULL);
740#endif
741 memset(&addr, 0, sizeof(addr));
742 addr.sin_family = AF_INET;
743 addr.sin_port = htons(port);
744 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
745}
746
747struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
748{
749 struct socket *sk;
750 int mode;
751
752 mode = confgetint("net", "mode");
753 if((mode == 0) || (mode == 1))
754 {
755 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
756 return(NULL);
757 if(bind(sk->fd, name, namelen) < 0)
758 {
759 putsock(sk);
760 return(NULL);
761 }
762 sk->state = SOCK_EST;
763 return(sk);
764 }
765 errno = EOPNOTSUPP;
766 return(NULL);
767}
768
769struct socket *netdupsock(struct socket *sk)
770{
771 struct socket *newsk;
772
773 newsk = newsock(sk->type);
774 if((newsk->fd = dup(sk->fd)) < 0)
775 {
776 flog(LOG_WARNING, "could not dup() socket: %s", strerror(errno));
777 putsock(newsk);
778 return(NULL);
779 }
780 newsk->state = sk->state;
781 newsk->ignread = sk->ignread;
782 if(sk->remote != NULL)
783 memcpy(newsk->remote = smalloc(sk->remotelen), sk->remote, newsk->remotelen = sk->remotelen);
784 return(newsk);
785}
786
787void netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
788{
789 if(sk->remote != NULL)
790 free(sk->remote);
791 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
792 sk->ignread = 1;
793}
794
795struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
796{
797 struct socket *sk;
798 int mode;
799
800 mode = confgetint("net", "mode");
801 if((mode == 0) || (mode == 1))
802 {
803 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
804 return(NULL);
805 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
806 if(!connect(sk->fd, addr, addrlen))
807 {
808 sk->state = SOCK_EST;
809 func(sk, 0, data);
810 return(sk);
811 }
812 if(errno == EINPROGRESS)
813 {
814 sk->state = SOCK_SYN;
815 sk->conncb = func;
816 sk->data = data;
817 return(sk);
818 }
819 putsock(sk);
820 return(NULL);
821 }
822 errno = EOPNOTSUPP;
823 return(NULL);
824}
825
826static void acceptunix(struct socket *sk)
827{
828 int buf;
829
830 buf = 1;
831#if UNIX_AUTH_STYLE == 1
832 if(setsockopt(sk->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
833 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", sk->fd, strerror(errno));
834#elif UNIX_AUTH_STYLE == 2
835 if(getpeereid(sk->fd, &sk->ucred.uid, &sk->ucred.gid) < 0)
836 {
837 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", sk->fd, strerror(errno));
838 sk->ucred.uid = -1;
839 sk->ucred.gid = -1;
840 }
841#endif
842}
843
844int pollsocks(int timeout)
845{
846 int ret, fd;
847 socklen_t retlen;
848 int newfd, maxfd;
849 fd_set rfds, wfds, efds;
850 struct socket *sk, *next, *newsk;
851 struct sockaddr_storage ss;
852 socklen_t sslen;
853 struct timeval tv;
854
855 FD_ZERO(&rfds);
856 FD_ZERO(&wfds);
857 FD_ZERO(&efds);
858 for(maxfd = 0, sk = sockets; sk != NULL; sk = sk->next)
859 {
860 if((sk->state == SOCK_STL) || (sk->fd < 0))
861 continue;
862 if(!sk->ignread)
863 FD_SET(sk->fd, &rfds);
864 if((sk->state == SOCK_SYN) || (sockqueuesize(sk) > 0))
865 FD_SET(sk->fd, &wfds);
866 FD_SET(sk->fd, &efds);
867 if(sk->fd > maxfd)
868 maxfd = sk->fd;
869 }
870 tv.tv_sec = timeout / 1000;
871 tv.tv_usec = (timeout % 1000) * 1000;
872 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
873 if(ret < 0)
874 {
875 if(errno != EINTR)
876 {
877 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
878 /* To avoid CPU hogging in case it's bad, which it
879 * probably is. */
880 sleep(1);
881 }
882 return(1);
883 }
884 for(sk = sockets; sk != NULL; sk = next)
885 {
886 next = sk->next;
887 fd = sk->fd;
888 switch(sk->state)
889 {
890 case SOCK_LST:
891 if(FD_ISSET(fd, &rfds))
892 {
893 sslen = sizeof(ss);
894 if((newfd = accept(fd, (struct sockaddr *)&ss, &sslen)) < 0)
895 {
896 if(sk->errcb != NULL)
897 sk->errcb(sk, errno, sk->data);
898 }
899 newsk = newsock(sk->type);
900 newsk->fd = newfd;
901 newsk->family = sk->family;
902 newsk->state = SOCK_EST;
903 memcpy(newsk->remote = smalloc(sslen), &ss, sslen);
904 newsk->remotelen = sslen;
905 if(ss.ss_family == PF_UNIX)
906 acceptunix(newsk);
907 if(sk->acceptcb != NULL)
908 sk->acceptcb(sk, newsk, sk->data);
909 putsock(newsk);
910 }
911 if(FD_ISSET(fd, &efds))
912 {
913 retlen = sizeof(ret);
914 getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
915 if(sk->errcb != NULL)
916 sk->errcb(sk, ret, sk->data);
917 continue;
918 }
919 break;
920 case SOCK_SYN:
921 if(FD_ISSET(fd, &efds))
922 {
923 retlen = sizeof(ret);
924 getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
925 if(sk->conncb != NULL)
926 sk->conncb(sk, ret, sk->data);
927 closesock(sk);
928 continue;
929 }
930 if(FD_ISSET(fd, &rfds) || FD_ISSET(fd, &wfds))
931 {
932 sk->state = SOCK_EST;
933 if(sk->conncb != NULL)
934 sk->conncb(sk, 0, sk->data);
935 }
936 break;
937 case SOCK_EST:
938 if(FD_ISSET(fd, &efds))
939 {
940 retlen = sizeof(ret);
941 getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
942 if(sk->errcb != NULL)
943 sk->errcb(sk, ret, sk->data);
944 closesock(sk);
945 continue;
946 }
947 if(FD_ISSET(fd, &rfds))
948 sockrecv(sk);
949 if(FD_ISSET(fd, &wfds))
950 {
951 if(sockqueuesize(sk) > 0)
952 sockflush(sk);
953 }
954 break;
955 }
956 }
957 for(sk = sockets; sk != NULL; sk = next)
958 {
959 next = sk->next;
960 if(sk->refcount == 1 && (sockqueuesize(sk) == 0))
961 {
962 unlinksock(sk);
963 continue;
964 }
965 if(sk->close && (sockqueuesize(sk) == 0))
966 closesock(sk);
967 if(sk->state == SOCK_STL)
968 {
969 unlinksock(sk);
970 continue;
971 }
972 }
973 return(1);
974}
975
976int socksettos(struct socket *sk, int tos)
977{
978 int buf;
979
980 if(sk->family == AF_UNIX)
981 return(0); /* Unix sockets are always perfect. :) */
982 if(sk->family == AF_INET)
983 {
984 switch(tos)
985 {
986 case 0:
987 buf = 0;
988 break;
989 case SOCK_TOS_MINCOST:
990 buf = 0x02;
991 break;
992 case SOCK_TOS_MAXREL:
993 buf = 0x04;
994 break;
995 case SOCK_TOS_MAXTP:
996 buf = 0x08;
997 break;
998 case SOCK_TOS_MINDELAY:
999 buf = 0x10;
1000 break;
1001 default:
1002 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1003 return(-1);
1004 }
1005 if(setsockopt(sk->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
1006 {
1007 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1008 return(-1);
1009 }
1010 return(0);
1011 }
1012 if(sk->family == AF_INET6)
1013 {
1014 switch(tos)
1015 {
1016 case 0:
1017 buf = 0;
1018 case SOCK_TOS_MINCOST:
1019 buf = confgetint("net", "diffserv-mincost");
1020 break;
1021 case SOCK_TOS_MAXREL:
1022 buf = confgetint("net", "diffserv-maxrel");
1023 break;
1024 case SOCK_TOS_MAXTP:
1025 buf = confgetint("net", "diffserv-maxtp");
1026 break;
1027 case SOCK_TOS_MINDELAY:
1028 buf = confgetint("net", "diffserv-mindelay");
1029 break;
1030 default:
1031 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1032 return(-1);
1033 }
1034 /*
1035 On Linux, the API IPv6 flow label management doesn't seem to
1036 be entirely complete, so I guess this will have to wait.
1037
1038 if(setsockopt(...) < 0)
1039 {
1040 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1041 return(-1);
1042 }
1043 */
1044 return(0);
1045 }
1046 flog(LOG_WARNING, "could not set TOS on sock of family %i", sk->family);
1047 return(1);
1048}
1049
1050struct resolvedata
1051{
1052 int fd;
1053 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1054 void *data;
1055 struct sockaddr_storage addr;
1056 int addrlen;
1057};
1058
1059static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1060{
1061 static char buf[80];
1062 int ret;
1063 struct sockaddr_in *ipv4;
1064
1065 if(!status)
1066 {
1067 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1068 {
1069 errno = ENOENT;
1070 data->callback(NULL, 0, data->data);
1071 } else {
1072 ipv4 = (struct sockaddr_in *)&data->addr;
1073 memcpy(&ipv4->sin_addr, buf, 4);
1074 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1075 }
1076 } else {
1077 errno = ENOENT;
1078 data->callback(NULL, 0, data->data);
1079 }
1080 close(data->fd);
1081 free(data);
1082}
1083
1084int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1085{
1086 int i;
1087 char *p;
1088 int port;
1089 int pfd[2];
1090 pid_t child;
1091 struct resolvedata *rdata;
1092 struct sockaddr_in ipv4;
1093 struct hostent *he;
1094 sigset_t sigset;
1095
1096 /* IPv4 */
1097 port = -1;
1098 if((p = strchr(addr, ':')) != NULL)
1099 {
1100 *p = 0;
1101 port = atoi(p + 1);
1102 }
1103 ipv4.sin_family = AF_INET;
1104 ipv4.sin_port = htons(port);
1105 if(inet_aton(addr, &ipv4.sin_addr))
1106 {
1107 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1108 } else {
1109 sigemptyset(&sigset);
1110 sigaddset(&sigset, SIGCHLD);
1111 sigprocmask(SIG_BLOCK, &sigset, NULL);
1112 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1113 {
1114 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1115 return(-1);
1116 }
1117 if(child == 0)
1118 {
1119 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1120 for(i = 3; i < FD_SETSIZE; i++)
1121 {
1122 if(i != pfd[1])
1123 close(i);
1124 }
1125 signal(SIGALRM, SIG_DFL);
1126 alarm(30);
1127 if((he = gethostbyname(addr)) == NULL)
1128 exit(1);
1129 write(pfd[1], he->h_addr_list[0], 4);
1130 exit(0);
1131 } else {
1132 close(pfd[1]);
1133 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1134 rdata = smalloc(sizeof(*rdata));
1135 rdata->fd = pfd[0];
1136 rdata->callback = callback;
1137 rdata->data = data;
1138 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1139 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1140 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1141 return(1);
1142 }
1143 }
1144 return(0);
1145}
1146
1147int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1148{
1149 socklen_t len;
1150 struct sockaddr_storage name;
1151
1152 *namebuf = NULL;
1153 if((sk->state == SOCK_STL) || (sk->fd < 0))
1154 return(-1);
1155 len = sizeof(name);
1156 if(getsockname(sk->fd, (struct sockaddr *)&name, &len) < 0)
1157 {
1158 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
1159 return(-1);
1160 }
1161 *namebuf = memcpy(smalloc(len), &name, len);
1162 if(lenbuf != NULL)
1163 *lenbuf = len;
1164 return(0);
1165}
1166
1167static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1168{
1169 if(dst->sa_family != src->sa_family)
1170 {
1171 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1172 return;
1173 }
1174 switch(src->sa_family)
1175 {
1176 case AF_INET:
1177 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1178 break;
1179 case AF_INET6:
1180 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1181 break;
1182 default:
1183 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1184 break;
1185 }
1186}
1187
1188static int makepublic(struct sockaddr *addr)
1189{
1190 int ret;
1191 socklen_t plen;
1192 struct sockaddr *pname;
1193
1194 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1195 {
1196 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1197 return(-1);
1198 }
1199 if(ret)
1200 return(0);
1201 sethostaddr(addr, pname);
1202 free(pname);
1203 return(0);
1204}
1205
1206int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1207{
1208 socklen_t len;
1209 struct sockaddr *name;
1210
1211 switch(confgetint("net", "mode"))
1212 {
1213 case 0:
1214 *namebuf = NULL;
1215 if((sk->state == SOCK_STL) || (sk->fd < 0))
1216 {
1217 errno = EBADF;
1218 return(-1);
1219 }
1220 if(!sockgetlocalname(sk, &name, &len))
1221 {
1222 *namebuf = name;
1223 *lenbuf = len;
1224 makepublic(name);
1225 return(0);
1226 }
1227 flog(LOG_ERR, "could not get remotely accessible name by any means");
1228 return(-1);
1229 case 1:
1230 errno = EOPNOTSUPP;
1231 return(-1);
1232 default:
1233 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1234 errno = EOPNOTSUPP;
1235 return(-1);
1236 }
1237}
1238
1239int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1240{
1241 struct sockaddr *name1, *name2;
1242 socklen_t len1, len2;
1243
1244 if(sk->family != sk2->family)
1245 {
1246 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", sk->family, sk2->family);
1247 return(-1);
1248 }
1249 if(sockgetremotename(sk, &name1, &len1))
1250 return(-1);
1251 if(sockgetremotename(sk2, &name2, &len2)) {
1252 free(name1);
1253 return(-1);
1254 }
1255 sethostaddr(name1, name2);
1256 free(name2);
1257 *namebuf = name1;
1258 *lenbuf = len1;
1259 return(0);
1260}
1261
1262int addreq(struct sockaddr *x, struct sockaddr *y)
1263{
1264 struct sockaddr_un *u1, *u2;
1265 struct sockaddr_in *n1, *n2;
1266#ifdef HAVE_IPV6
1267 struct sockaddr_in6 *s1, *s2;
1268#endif
1269
1270 if(x->sa_family != y->sa_family)
1271 return(0);
1272 switch(x->sa_family) {
1273 case AF_UNIX:
1274 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1275 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1276 return(0);
1277 break;
1278 case AF_INET:
1279 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1280 if(n1->sin_port != n2->sin_port)
1281 return(0);
1282 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1283 return(0);
1284 break;
1285#ifdef HAVE_IPV6
1286 case AF_INET6:
1287 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1288 if(s1->sin6_port != s2->sin6_port)
1289 return(0);
1290 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1291 return(0);
1292 break;
1293#endif
1294 }
1295 return(1);
1296}
1297
1298char *formataddress(struct sockaddr *arg, socklen_t arglen)
1299{
1300 struct sockaddr_in *ipv4;
1301#ifdef HAVE_IPV6
1302 struct sockaddr_in6 *ipv6;
1303#endif
1304 static char *ret = NULL;
1305 char buf[1024];
1306
1307 if(ret != NULL)
1308 free(ret);
1309 ret = NULL;
1310 switch(arg->sa_family)
1311 {
1312 case AF_UNIX:
1313 ret = sstrdup("Unix socket");
1314 break;
1315 case AF_INET:
1316 ipv4 = (struct sockaddr_in *)arg;
1317 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1318 return(NULL);
1319 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1320 break;
1321#ifdef HAVE_IPV6
1322 case AF_INET6:
1323 ipv6 = (struct sockaddr_in6 *)arg;
1324 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1325 return(NULL);
1326 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
1327 break;
1328#endif
1329 default:
1330 errno = EPFNOSUPPORT;
1331 break;
1332 }
1333 return(ret);
1334}
1335
1336#if 0
1337
1338/*
1339 * It was very nice to use this, but it seems
1340 * to mess things up, so I guess it has to go... :-(
1341 */
1342
1343static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1344{
1345 struct sockaddr *arg;
1346 socklen_t arglen;
1347 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1348 * lowercase letters to 1, so I do this
1349 * instead. */
1350 struct sockaddr_in *ipv4;
1351 int ret;
1352
1353 arg = *(struct sockaddr **)(args[0]);
1354 arglen = *(socklen_t *)(args[1]);
1355 switch(arg->sa_family)
1356 {
1357 case AF_UNIX:
1358 UNIX = (struct sockaddr_un *)arg;
1359 ret = fprintf(stream, "%s", UNIX->sun_path);
1360 break;
1361 case AF_INET:
1362 ipv4 = (struct sockaddr_in *)arg;
1363 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1364 break;
1365 default:
1366 ret = -1;
1367 errno = EPFNOSUPPORT;
1368 break;
1369 }
1370 return(ret);
1371}
1372
1373static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1374{
1375 if(n > 0)
1376 argtypes[0] = PA_POINTER;
1377 if(n > 1)
1378 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1379 * be an int, so I guess this should be
1380 * safe. */
1381 return(2);
1382}
1383#endif
1384
1385static int init(int hup)
1386{
1387 if(!hup)
1388 {
1389 /*
1390 if(register_printf_function('N', formataddress, formataddress_arginfo))
1391 {
1392 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1393 return(1);
1394 }
1395 */
1396 }
1397 return(0);
1398}
1399
1400static void terminate(void)
1401{
1402 while(sockets != NULL)
1403 unlinksock(sockets);
1404}
1405
1406static struct module me =
1407{
1408 .name = "net",
1409 .conf =
1410 {
1411 .vars = myvars
1412 },
1413 .init = init,
1414 .terminate = terminate
1415};
1416
1417MODULE(me)
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