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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 }
291 if(sk->fd >= 0)
292 close(sk->fd);
293 if(sk->remote != NULL)
294 free(sk->remote);
295 free(sk);
296 }
297}
298
336539c2 299void sockpushdata(struct socket *sk, void *buf, size_t size)
300{
301 switch(sk->type)
302 {
303 case SOCK_STREAM:
304 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + size, 1, 1);
305 memmove(sk->inbuf.s.buf + size, sk->inbuf.s.buf, sk->inbuf.s.datasize);
306 memcpy(sk->inbuf.s.buf, buf, size);
307 sk->inbuf.s.datasize += size;
308 break;
309 case SOCK_DGRAM:
310 /* XXX */
311 break;
312 }
313 return;
314}
315
d3372da9 316void *sockgetinbuf(struct socket *sk, size_t *size)
317{
318 void *buf;
319 struct dgrambuf *dbuf;
320
321 switch(sk->type)
322 {
323 case SOCK_STREAM:
324 if((sk->inbuf.s.buf == NULL) || (sk->inbuf.s.datasize == 0))
325 {
326 *size = 0;
327 return(NULL);
328 }
329 buf = sk->inbuf.s.buf;
330 *size = sk->inbuf.s.datasize;
331 sk->inbuf.s.buf = NULL;
332 sk->inbuf.s.bufsize = sk->inbuf.s.datasize = 0;
333 return(buf);
334 case SOCK_DGRAM:
335 if((dbuf = sk->inbuf.d.f) == NULL)
336 return(NULL);
337 sk->inbuf.d.f = dbuf->next;
338 if(dbuf->next == NULL)
339 sk->inbuf.d.l = NULL;
340 buf = dbuf->data;
341 *size = dbuf->size;
342 free(dbuf->addr);
343 free(dbuf);
344 return(buf);
345 }
346 return(NULL);
347}
348
349static void sockrecv(struct socket *sk)
350{
351 int ret, inq;
352 struct dgrambuf *dbuf;
353
354 switch(sk->type)
355 {
356 case SOCK_STREAM:
357#if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
358 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
359 * how to read the inqueue size on other OSs */
360 if(ioctl(sk->fd, SIOCINQ, &inq))
361 {
362 /* I don't really know what could go wrong here, so let's
363 * assume it's transient. */
364 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), sk->fd);
365 inq = 2048;
366 }
367#else
368 inq = 2048;
369#endif
370 if(inq > 65536)
371 inq = 65536;
372 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + inq, 1, 1);
373 ret = read(sk->fd, sk->inbuf.s.buf + sk->inbuf.s.datasize, inq);
374 if(ret < 0)
375 {
376 if((errno == EINTR) || (errno == EAGAIN))
377 return;
cab0b442 378 if(sk->errcb != NULL)
379 sk->errcb(sk, errno, sk->data);
d3372da9 380 closesock(sk);
381 return;
382 }
383 if(ret == 0)
384 {
cab0b442 385 if(sk->errcb != NULL)
386 sk->errcb(sk, 0, sk->data);
d3372da9 387 closesock(sk);
388 return;
389 }
390 sk->inbuf.s.datasize += ret;
cab0b442 391 if(sk->readcb != NULL)
392 sk->readcb(sk, sk->data);
d3372da9 393 break;
394 case SOCK_DGRAM:
395 if(ioctl(sk->fd, SIOCINQ, &inq))
396 {
397 /* I don't really know what could go wrong here, so let's
398 * assume it's transient. */
399 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), sk->fd);
400 return;
401 }
402 dbuf = smalloc(sizeof(*dbuf));
403 dbuf->data = smalloc(inq);
404 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
405 ret = recvfrom(sk->fd, dbuf->data, inq, 0, dbuf->addr, &dbuf->addrlen);
406 if(ret < 0)
407 {
408 free(dbuf->addr);
409 free(dbuf->data);
410 free(dbuf);
411 if((errno == EINTR) || (errno == EAGAIN))
412 return;
cab0b442 413 if(sk->errcb != NULL)
414 sk->errcb(sk, errno, sk->data);
d3372da9 415 closesock(sk);
416 return;
417 }
418 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
419 * have EOF), but rather an empty packet. I don't know if any
420 * other potential DGRAM protocols might have an EOF
421 * condition, so let's play safe. */
422 if(ret == 0)
423 {
424 free(dbuf->addr);
425 free(dbuf->data);
426 free(dbuf);
427 if(!((sk->family == AF_INET) || (sk->family == AF_INET6)))
428 {
cab0b442 429 if(sk->errcb != NULL)
430 sk->errcb(sk, 0, sk->data);
d3372da9 431 closesock(sk);
432 }
433 return;
434 }
435 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
436 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
437 dbuf->next = NULL;
438 if(sk->inbuf.d.l != NULL)
439 sk->inbuf.d.l->next = dbuf;
440 else
441 sk->inbuf.d.f = dbuf;
442 sk->inbuf.d.l = dbuf;
cab0b442 443 if(sk->readcb != NULL)
444 sk->readcb(sk, sk->data);
d3372da9 445 break;
446 }
447}
448
449static void sockflush(struct socket *sk)
450{
451 int ret;
452 struct dgrambuf *dbuf;
453
454 switch(sk->type)
455 {
456 case SOCK_STREAM:
457 if(sk->isrealsocket)
458 ret = send(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
459 else
460 ret = write(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize);
461 if(ret < 0)
462 {
463 /* For now, assume transient error, since
464 * the socket is polled for errors */
465 break;
466 }
467 if(ret > 0)
468 {
469 memmove(sk->outbuf.s.buf, ((char *)sk->outbuf.s.buf) + ret, sk->outbuf.s.datasize -= ret);
cab0b442 470 if(sk->writecb != NULL)
471 sk->writecb(sk, sk->data);
d3372da9 472 }
473 break;
474 case SOCK_DGRAM:
475 dbuf = sk->outbuf.d.f;
476 if((sk->outbuf.d.f = dbuf->next) == NULL)
477 sk->outbuf.d.l = NULL;
478 sendto(sk->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
479 free(dbuf->data);
480 free(dbuf->addr);
481 free(dbuf);
cab0b442 482 if(sk->writecb != NULL)
483 sk->writecb(sk, sk->data);
d3372da9 484 break;
485 }
486}
487
488void closesock(struct socket *sk)
489{
490 sk->state = SOCK_STL;
491 close(sk->fd);
492 sk->fd = -1;
493 sk->close = 0;
494}
495
496void sockqueue(struct socket *sk, void *data, size_t size)
497{
498 struct dgrambuf *new;
499
500 if(sk->state == SOCK_STL)
501 return;
502 switch(sk->type)
503 {
504 case SOCK_STREAM:
505 sizebuf(&(sk->outbuf.s.buf), &(sk->outbuf.s.bufsize), sk->outbuf.s.datasize + size, 1, 1);
506 memcpy(sk->outbuf.s.buf + sk->outbuf.s.datasize, data, size);
507 sk->outbuf.s.datasize += size;
508 break;
509 case SOCK_DGRAM:
510 if(sk->remote == NULL)
511 return;
512 new = smalloc(sizeof(*new));
513 new->next = NULL;
514 memcpy(new->data = smalloc(size), data, new->size = size);
515 memcpy(new->addr = smalloc(sk->remotelen), sk->remote, new->addrlen = sk->remotelen);
516 if(sk->outbuf.d.l == NULL)
517 {
518 sk->outbuf.d.l = sk->outbuf.d.f = new;
519 } else {
520 sk->outbuf.d.l->next = new;
521 sk->outbuf.d.l = new;
522 }
523 break;
524 }
525}
526
527size_t sockgetdatalen(struct socket *sk)
528{
529 struct dgrambuf *b;
530 size_t ret;
531
532 switch(sk->type)
533 {
534 case SOCK_STREAM:
535 ret = sk->inbuf.s.datasize;
536 break;
537 case SOCK_DGRAM:
538 ret = 0;
539 for(b = sk->inbuf.d.f; b != NULL; b = b->next)
540 ret += b->size;
541 break;
542 }
543 return(ret);
544}
545
546size_t sockqueuesize(struct socket *sk)
547{
548 struct dgrambuf *b;
549 size_t ret;
550
551 switch(sk->type)
552 {
553 case SOCK_STREAM:
554 ret = sk->outbuf.s.datasize;
555 break;
556 case SOCK_DGRAM:
557 ret = 0;
558 for(b = sk->outbuf.d.f; b != NULL; b = b->next)
559 ret += b->size;
560 break;
561 }
562 return(ret);
563}
564
d3372da9 565/*
566 * The difference between netcslisten() and netcslistenlocal() is that
567 * netcslistenlocal() always listens on the local host, instead of
568 * following proxy/passive mode directions. It is suitable for eg. the
569 * UI channel, while the file sharing networks should, naturally, use
570 * netcslisten() instead.
571*/
572
cab0b442 573struct socket *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data)
d3372da9 574{
575 struct socket *sk;
66c517d2 576 int intbuf;
d3372da9 577
578 /* I don't know if this is actually correct (it probably isn't),
579 * but since, at on least Linux systems, PF_* are specifically
580 * #define'd to their AF_* counterparts, it allows for a severely
581 * smoother implementation. If it breaks something on your
582 * platform, please tell me so.
583 */
584 if((sk = mksock(name->sa_family, type)) == NULL)
585 return(NULL);
586 sk->state = SOCK_LST;
687b2ee2 587 if(confgetint("net", "reuseaddr"))
588 {
589 intbuf = 1;
590 setsockopt(sk->fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
591 }
d3372da9 592 if(bind(sk->fd, name, namelen) < 0)
593 {
594 putsock(sk);
595 return(NULL);
596 }
597 if(listen(sk->fd, 16) < 0)
598 {
599 putsock(sk);
600 return(NULL);
601 }
cab0b442 602 sk->acceptcb = func;
603 sk->data = data;
d3372da9 604 return(sk);
605}
606
cab0b442 607struct socket *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data)
c23acc61 608{
609 if(confgetint("net", "mode") == 1)
610 {
611 errno = EOPNOTSUPP;
612 return(NULL);
613 }
c23acc61 614 if(confgetint("net", "mode") == 0)
615 return(netcslistenlocal(type, name, namelen, func, data));
616 errno = EOPNOTSUPP;
617 return(NULL);
618}
619
cab0b442 620struct socket *netcstcplisten(int port, int local, void (*func)(struct socket *, struct socket *, void *), void *data)
0a1bc5b1 621{
622 struct sockaddr_in addr;
623#ifdef HAVE_IPV6
624 struct sockaddr_in6 addr6;
625#endif
cab0b442 626 struct socket *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct socket *, struct socket *, void *), void *);
0a1bc5b1 627 struct socket *ret;
628
629 if(local)
630 csfunc = netcslistenlocal;
631 else
632 csfunc = netcslisten;
633#ifdef HAVE_IPV6
634 memset(&addr6, 0, sizeof(addr6));
635 addr6.sin6_family = AF_INET6;
636 addr6.sin6_port = htons(port);
637 addr6.sin6_addr = in6addr_any;
638 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
639 return(ret);
640 if((ret == NULL) && (errno != EAFNOSUPPORT))
641 return(NULL);
642#endif
643 memset(&addr, 0, sizeof(addr));
644 addr.sin_family = AF_INET;
645 addr.sin_port = htons(port);
646 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
647}
648
d3372da9 649struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
650{
651 struct socket *sk;
652 int mode;
653
654 mode = confgetint("net", "mode");
655 if((mode == 0) || (mode == 1))
656 {
657 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
658 return(NULL);
659 if(bind(sk->fd, name, namelen) < 0)
660 {
661 putsock(sk);
662 return(NULL);
663 }
664 sk->state = SOCK_EST;
665 return(sk);
666 }
667 errno = EOPNOTSUPP;
668 return(NULL);
669}
670
671struct socket *netdupsock(struct socket *sk)
672{
673 struct socket *newsk;
674
675 newsk = newsock(sk->type);
676 if((newsk->fd = dup(sk->fd)) < 0)
677 {
678 flog(LOG_WARNING, "could not dup() socket: %s", strerror(errno));
679 putsock(newsk);
680 return(NULL);
681 }
682 newsk->state = sk->state;
683 newsk->ignread = sk->ignread;
684 if(sk->remote != NULL)
685 memcpy(newsk->remote = smalloc(sk->remotelen), sk->remote, newsk->remotelen = sk->remotelen);
686 return(newsk);
687}
688
689void netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
690{
691 if(sk->remote != NULL)
692 free(sk->remote);
693 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
694 sk->ignread = 1;
695}
696
cab0b442 697struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
d3372da9 698{
699 struct socket *sk;
700 int mode;
701
702 mode = confgetint("net", "mode");
703 if((mode == 0) || (mode == 1))
704 {
705 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
706 return(NULL);
707 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
708 if(!connect(sk->fd, addr, addrlen))
709 {
710 sk->state = SOCK_EST;
711 func(sk, 0, data);
712 return(sk);
713 }
714 if(errno == EINPROGRESS)
715 {
716 sk->state = SOCK_SYN;
cab0b442 717 sk->conncb = func;
718 sk->data = data;
d3372da9 719 return(sk);
720 }
721 putsock(sk);
722 return(NULL);
723 }
724 errno = EOPNOTSUPP;
725 return(NULL);
726}
727
728int pollsocks(int timeout)
729{
eaa35963 730 int i, num, ret;
731 socklen_t retlen;
d3372da9 732 int newfd;
733 struct pollfd *pfds;
734 struct socket *sk, *next, *newsk;
735 struct sockaddr_storage ss;
736 socklen_t sslen;
737
738 pfds = smalloc(sizeof(*pfds) * (num = numsocks));
739 for(i = 0, sk = sockets; i < num; sk = sk->next)
740 {
741 if(sk->state == SOCK_STL)
742 {
743 num--;
744 continue;
745 }
746 pfds[i].fd = sk->fd;
747 pfds[i].events = 0;
748 if(!sk->ignread)
749 pfds[i].events |= POLLIN;
750 if((sk->state == SOCK_SYN) || (sockqueuesize(sk) > 0))
751 pfds[i].events |= POLLOUT;
752 pfds[i].revents = 0;
753 i++;
754 }
755 ret = poll(pfds, num, timeout);
756 if(ret < 0)
757 {
758 if(errno != EINTR)
759 {
760 flog(LOG_CRIT, "pollsocks: poll errored out: %s", strerror(errno));
761 /* To avoid CPU hogging in case it's bad, which it
762 * probably is. */
763 sleep(1);
764 }
765 free(pfds);
766 return(1);
767 }
768 for(sk = sockets; sk != NULL; sk = next)
769 {
770 next = sk->next;
771 for(i = 0; i < num; i++)
772 {
773 if(pfds[i].fd == sk->fd)
774 break;
775 }
776 if(i == num)
777 continue;
778 switch(sk->state)
779 {
780 case SOCK_LST:
781 if(pfds[i].revents & POLLIN)
782 {
783 sslen = sizeof(ss);
784 if((newfd = accept(sk->fd, (struct sockaddr *)&ss, &sslen)) < 0)
cab0b442 785 {
786 if(sk->errcb != NULL)
787 sk->errcb(sk, errno, sk->data);
788 }
d3372da9 789 newsk = newsock(sk->type);
790 newsk->fd = newfd;
791 newsk->family = sk->family;
792 newsk->state = SOCK_EST;
793 memcpy(newsk->remote = smalloc(sslen), &ss, sslen);
794 newsk->remotelen = sslen;
795 putsock(newsk);
cab0b442 796 if(sk->acceptcb != NULL)
797 sk->acceptcb(sk, newsk, sk->data);
d3372da9 798 }
799 if(pfds[i].revents & POLLERR)
800 {
801 retlen = sizeof(ret);
802 getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
cab0b442 803 if(sk->errcb != NULL)
804 sk->errcb(sk, ret, sk->data);
d3372da9 805 continue;
806 }
807 break;
808 case SOCK_SYN:
809 if(pfds[i].revents & POLLERR)
810 {
811 retlen = sizeof(ret);
812 getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
cab0b442 813 if(sk->conncb != NULL)
814 sk->conncb(sk, ret, sk->data);
d3372da9 815 closesock(sk);
816 continue;
817 }
818 if(pfds[i].revents & (POLLIN | POLLOUT))
819 {
820 sk->state = SOCK_EST;
cab0b442 821 if(sk->conncb != NULL)
822 sk->conncb(sk, 0, sk->data);
d3372da9 823 }
824 break;
825 case SOCK_EST:
826 if(pfds[i].revents & POLLERR)
827 {
828 retlen = sizeof(ret);
829 getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
cab0b442 830 if(sk->errcb != NULL)
831 sk->errcb(sk, ret, sk->data);
d3372da9 832 closesock(sk);
833 continue;
834 }
835 if(pfds[i].revents & POLLIN)
836 sockrecv(sk);
837 if(pfds[i].revents & POLLOUT)
838 {
839 if(sockqueuesize(sk) > 0)
840 sockflush(sk);
841 }
842 break;
843 }
844 if(pfds[i].revents & POLLNVAL)
845 {
846 flog(LOG_CRIT, "BUG: stale socket struct on fd %i", sk->fd);
847 sk->state = SOCK_STL;
848 unlinksock(sk);
849 continue;
850 }
851 if(pfds[i].revents & POLLHUP)
852 {
cab0b442 853 if(sk->errcb != NULL)
854 sk->errcb(sk, 0, sk->data);
d3372da9 855 closesock(sk);
856 unlinksock(sk);
857 continue;
858 }
859 }
860 free(pfds);
861 for(sk = sockets; sk != NULL; sk = next)
862 {
863 next = sk->next;
864 if(sk->refcount == 1 && (sockqueuesize(sk) == 0))
865 {
866 unlinksock(sk);
867 continue;
868 }
869 if(sk->close && (sockqueuesize(sk) == 0))
870 closesock(sk);
871 if(sk->state == SOCK_STL)
872 {
873 unlinksock(sk);
874 continue;
875 }
876 }
877 return(1);
878}
879
880int socksettos(struct socket *sk, int tos)
881{
b020fb3d 882 int buf;
883
d3372da9 884 if(sk->family == AF_INET)
885 {
b020fb3d 886 switch(tos)
887 {
b198bed6 888 case 0:
889 buf = 0;
890 break;
b020fb3d 891 case SOCK_TOS_MINCOST:
18c1ae1d 892 buf = 0x02;
b020fb3d 893 break;
894 case SOCK_TOS_MAXREL:
18c1ae1d 895 buf = 0x04;
b020fb3d 896 break;
897 case SOCK_TOS_MAXTP:
18c1ae1d 898 buf = 0x08;
b020fb3d 899 break;
900 case SOCK_TOS_MINDELAY:
18c1ae1d 901 buf = 0x10;
b020fb3d 902 break;
903 default:
904 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
905 return(-1);
906 }
907 if(setsockopt(sk->fd, SOL_IP, IP_TOS, &buf, sizeof(buf)) < 0)
d3372da9 908 {
909 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
910 return(-1);
911 }
912 return(0);
913 }
b020fb3d 914 if(sk->family == AF_INET6)
915 {
916 switch(tos)
917 {
b198bed6 918 case 0:
919 buf = 0;
b020fb3d 920 case SOCK_TOS_MINCOST:
921 buf = confgetint("net", "diffserv-mincost");
922 break;
923 case SOCK_TOS_MAXREL:
924 buf = confgetint("net", "diffserv-maxrel");
925 break;
926 case SOCK_TOS_MAXTP:
927 buf = confgetint("net", "diffserv-maxtp");
928 break;
929 case SOCK_TOS_MINDELAY:
930 buf = confgetint("net", "diffserv-mindelay");
931 break;
932 default:
933 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
934 return(-1);
935 }
936 /*
937 On Linux, the API IPv6 flow label management doesn't seem to
938 be entirely complete, so I guess this will have to wait.
939
940 if(setsockopt(...) < 0)
941 {
942 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
943 return(-1);
944 }
945 */
946 return(0);
947 }
d3372da9 948 flog(LOG_WARNING, "could not set TOS on sock of family %i", sk->family);
949 return(1);
950}
951
952struct resolvedata
953{
954 int fd;
955 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
956 void *data;
957 struct sockaddr_storage addr;
958 int addrlen;
959};
960
961static void resolvecb(pid_t pid, int status, struct resolvedata *data)
962{
963 static char buf[80];
964 int ret;
965 struct sockaddr_in *ipv4;
966
967 if(!status)
968 {
969 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
970 {
971 errno = ENONET;
972 data->callback(NULL, 0, data->data);
973 } else {
974 ipv4 = (struct sockaddr_in *)&data->addr;
975 memcpy(&ipv4->sin_addr, buf, 4);
976 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
977 }
978 } else {
979 errno = ENONET;
980 data->callback(NULL, 0, data->data);
981 }
982 close(data->fd);
983 free(data);
984}
985
986int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
987{
988 int i;
989 char *p;
990 int port;
991 int pfd[2];
992 pid_t child;
993 struct resolvedata *rdata;
994 struct sockaddr_in ipv4;
995 struct hostent *he;
996 sigset_t sigset;
997
998 /* IPv4 */
999 port = -1;
1000 if((p = strchr(addr, ':')) != NULL)
1001 {
1002 *p = 0;
1003 port = atoi(p + 1);
1004 }
1005 ipv4.sin_family = AF_INET;
1006 ipv4.sin_port = htons(port);
1007 if(inet_aton(addr, &ipv4.sin_addr))
1008 {
1009 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1010 } else {
1011 sigemptyset(&sigset);
1012 sigaddset(&sigset, SIGCHLD);
1013 sigprocmask(SIG_BLOCK, &sigset, NULL);
1014 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1015 {
1016 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1017 return(-1);
1018 }
1019 if(child == 0)
1020 {
1021 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1022 for(i = 3; i < FD_SETSIZE; i++)
1023 {
1024 if(i != pfd[1])
1025 close(i);
1026 }
1027 signal(SIGALRM, SIG_DFL);
1028 alarm(30);
1029 if((he = gethostbyname(addr)) == NULL)
1030 exit(1);
1031 write(pfd[1], he->h_addr_list[0], 4);
1032 exit(0);
1033 } else {
1034 close(pfd[1]);
1035 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1036 rdata = smalloc(sizeof(*rdata));
1037 rdata->fd = pfd[0];
1038 rdata->callback = callback;
1039 rdata->data = data;
1040 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1041 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1042 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1043 return(1);
1044 }
1045 }
1046 return(0);
1047}
1048
1049int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1050{
1051 socklen_t len;
1052 struct sockaddr_storage name;
1053
1054 *namebuf = NULL;
1055 if((sk->state == SOCK_STL) || (sk->fd < 0))
1056 return(-1);
1057 len = sizeof(name);
1058 if(getsockname(sk->fd, (struct sockaddr *)&name, &len) < 0)
1059 {
6fb0c6ac 1060 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
d3372da9 1061 return(-1);
1062 }
1063 *namebuf = memcpy(smalloc(len), &name, len);
1064 *lenbuf = len;
1065 return(0);
1066}
1067
eaa35963 1068static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1069{
1070 if(dst->sa_family != src->sa_family)
1071 {
1072 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1073 return;
1074 }
1075 switch(src->sa_family)
1076 {
1077 case AF_INET:
1078 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1079 break;
1080 case AF_INET6:
1081 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1082 break;
1083 default:
1084 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1085 break;
1086 }
1087}
1088
1089static int makepublic(struct sockaddr *addr)
d3372da9 1090{
6fb0c6ac 1091 int ret;
eaa35963 1092 socklen_t plen;
1093 struct sockaddr *pname;
1094
1095 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1096 {
1097 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1098 return(-1);
1099 }
1100 if(ret)
1101 return(0);
1102 sethostaddr(addr, pname);
1103 free(pname);
1104 return(0);
1105}
1106
1107int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1108{
d3372da9 1109 socklen_t len;
6fb0c6ac 1110 struct sockaddr *name;
d3372da9 1111
1112 switch(confgetint("net", "mode"))
1113 {
1114 case 0:
1115 *namebuf = NULL;
1116 if((sk->state == SOCK_STL) || (sk->fd < 0))
d3372da9 1117 {
eaa35963 1118 errno = EBADF;
d3372da9 1119 return(-1);
1120 }
6fb0c6ac 1121 if(!sockgetlocalname(sk, &name, &len))
1122 {
1123 *namebuf = name;
1124 *lenbuf = len;
eaa35963 1125 makepublic(name);
6fb0c6ac 1126 return(0);
1127 }
1128 flog(LOG_ERR, "could not get remotely accessible name by any means");
1129 return(-1);
d3372da9 1130 case 1:
1131 errno = EOPNOTSUPP;
1132 return(-1);
1133 default:
1134 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1135 errno = EOPNOTSUPP;
1136 return(-1);
1137 }
1138}
1139
d29853b1 1140int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1141{
1142 struct sockaddr *name1, *name2;
1143 socklen_t len1, len2;
1144
1145 if(sk->family != sk2->family)
1146 {
1147 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", sk->family, sk2->family);
1148 return(-1);
1149 }
3804379d 1150 if(sockgetremotename(sk, &name1, &len1))
d29853b1 1151 return(-1);
3804379d 1152 if(sockgetremotename(sk2, &name2, &len2)) {
d29853b1 1153 free(name1);
1154 return(-1);
1155 }
1156 sethostaddr(name1, name2);
1157 free(name2);
1158 *namebuf = name1;
1159 *lenbuf = len1;
1160 return(0);
1161}
1162
99a28d47 1163int addreq(struct sockaddr *x, struct sockaddr *y)
1164{
1165 struct sockaddr_un *u1, *u2;
1166 struct sockaddr_in *n1, *n2;
1167#ifdef HAVE_IPV6
1168 struct sockaddr_in6 *s1, *s2;
1169#endif
1170
1171 if(x->sa_family != y->sa_family)
1172 return(0);
1173 switch(x->sa_family) {
1174 case AF_UNIX:
1175 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1176 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1177 return(0);
1178 break;
1179 case AF_INET:
1180 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1181 if(n1->sin_port != n2->sin_port)
1182 return(0);
1183 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1184 return(0);
1185 break;
c8a729d7 1186#ifdef HAVE_IPV6
99a28d47 1187 case AF_INET6:
1188 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1189 if(s1->sin6_port != s2->sin6_port)
1190 return(0);
1191 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1192 return(0);
1193 break;
c8a729d7 1194#endif
99a28d47 1195 }
1196 return(1);
1197}
1198
d3372da9 1199char *formataddress(struct sockaddr *arg, socklen_t arglen)
1200{
1201 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1202 * lowercase letters to 1, so I do this
1203 * instead. */
1204 struct sockaddr_in *ipv4;
1205#ifdef HAVE_IPV6
1206 struct sockaddr_in6 *ipv6;
1207#endif
1208 static char *ret = NULL;
1209 char buf[1024];
1210
1211 if(ret != NULL)
1212 free(ret);
1213 ret = NULL;
1214 switch(arg->sa_family)
1215 {
1216 case AF_UNIX:
1217 UNIX = (struct sockaddr_un *)arg;
1218 ret = sprintf2("%s", UNIX->sun_path);
1219 break;
1220 case AF_INET:
1221 ipv4 = (struct sockaddr_in *)arg;
1222 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1223 return(NULL);
1224 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1225 break;
1226#ifdef HAVE_IPV6
1227 case AF_INET6:
1228 ipv6 = (struct sockaddr_in6 *)arg;
1229 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1230 return(NULL);
fc7f7735 1231 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
d3372da9 1232 break;
1233#endif
1234 default:
1235 errno = EPFNOSUPPORT;
1236 break;
1237 }
1238 return(ret);
1239}
1240
1241#if 0
1242
1243/*
1244 * It was very nice to use this, but it seems
1245 * to mess things up, so I guess it has to go... :-(
1246 */
1247
1248static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1249{
1250 struct sockaddr *arg;
1251 socklen_t arglen;
1252 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1253 * lowercase letters to 1, so I do this
1254 * instead. */
1255 struct sockaddr_in *ipv4;
1256 int ret;
1257
1258 arg = *(struct sockaddr **)(args[0]);
1259 arglen = *(socklen_t *)(args[1]);
1260 switch(arg->sa_family)
1261 {
1262 case AF_UNIX:
1263 UNIX = (struct sockaddr_un *)arg;
1264 ret = fprintf(stream, "%s", UNIX->sun_path);
1265 break;
1266 case AF_INET:
1267 ipv4 = (struct sockaddr_in *)arg;
1268 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1269 break;
1270 default:
1271 ret = -1;
1272 errno = EPFNOSUPPORT;
1273 break;
1274 }
1275 return(ret);
1276}
1277
1278static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1279{
1280 if(n > 0)
1281 argtypes[0] = PA_POINTER;
1282 if(n > 1)
1283 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1284 * be an int, so I guess this should be
1285 * safe. */
1286 return(2);
1287}
1288#endif
1289
1290static int init(int hup)
1291{
1292 if(!hup)
1293 {
1294 /*
1295 if(register_printf_function('N', formataddress, formataddress_arginfo))
1296 {
1297 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1298 return(1);
1299 }
1300 */
1301 }
1302 return(0);
1303}
1304
1305static void terminate(void)
1306{
1307 while(sockets != NULL)
1308 unlinksock(sockets);
1309}
1310
1311static struct module me =
1312{
1313 .name = "net",
1314 .conf =
1315 {
1316 .vars = myvars
1317 },
1318 .init = init,
1319 .terminate = terminate
1320};
1321
1322MODULE(me)
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