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Fix some potential issues when freeing running cbchains.
[doldaconnect.git] / daemon / net.c
CommitLineData
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{
51 /* 0 = Direct mode, 1 = Passive mode, 2 = SOCKS proxy */
52 {CONF_VAR_INT, "mode", {.num = 0}},
347d6d76 53 {CONF_VAR_BOOL, "reuseaddr", {.num = 0}},
d3372da9 54 /* Only for direct mode */
55 {CONF_VAR_IPV4, "visibleipv4", {.ipv4 = {0}}},
56 {CONF_VAR_STRING, "publicif", {.str = L""}},
b020fb3d 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}},
d3372da9 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 }
bcb73bb3 92 if((pif = icswcstombs(confgetstr("net", "publicif"), NULL, NULL)) == NULL)
d3372da9 93 {
94 flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno));
95 return(-1);
96 }
6fb0c6ac 97 if(!strcmp(pif, ""))
98 return(1);
d3372da9 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 {
1315d02a 112 if(strcmp(ifr->ifr_name, pif))
6fb0c6ac 113 continue;
d3372da9 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)
6fb0c6ac 117 break;
118 if(!(req.ifr_flags & IFF_UP))
d3372da9 119 {
6fb0c6ac 120 flog(LOG_WARNING, "public interface is down");
121 break;
d3372da9 122 }
6fb0c6ac 123 if(ifr->ifr_addr.sa_family != AF_INET)
d3372da9 124 {
6fb0c6ac 125 flog(LOG_WARNING, "address of the public interface is not AF_INET");
126 break;
d3372da9 127 }
6fb0c6ac 128 ipv4 = smalloc(sizeof(*ipv4));
129 memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr));
130 break;
d3372da9 131 }
bcb73bb3 132 free(conf.ifc_buf);
d3372da9 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 }
6fb0c6ac 143 return(1);
d3372da9 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 }
5ec60e42 177 CBCHAININIT(new, socket_conn);
178 CBCHAININIT(new, socket_err);
179 CBCHAININIT(new, socket_read);
180 CBCHAININIT(new, socket_write);
181 CBCHAININIT(new, socket_accept);
d3372da9 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 {
5ec60e42 243 CBCHAINFREE(sk, socket_conn);
244 CBCHAINFREE(sk, socket_err);
245 CBCHAINFREE(sk, socket_read);
246 CBCHAINFREE(sk, socket_write);
247 CBCHAINFREE(sk, socket_accept);
d3372da9 248 switch(sk->type)
249 {
250 case SOCK_STREAM:
251 if(sk->outbuf.s.buf != NULL)
252 free(sk->outbuf.s.buf);
253 if(sk->inbuf.s.buf != NULL)
254 free(sk->inbuf.s.buf);
255 break;
256 case SOCK_DGRAM:
257 while((buf = sk->outbuf.d.f) != NULL)
258 {
259 sk->outbuf.d.f = buf->next;
260 free(buf->data);
161604ea 261 free(buf->addr);
d3372da9 262 free(buf);
263 }
264 while((buf = sk->inbuf.d.f) != NULL)
265 {
266 sk->inbuf.d.f = buf->next;
267 free(buf->data);
161604ea 268 free(buf->addr);
d3372da9 269 free(buf);
270 }
271 break;
272 }
273 if(sk->fd >= 0)
274 close(sk->fd);
275 if(sk->remote != NULL)
276 free(sk->remote);
277 free(sk);
278 }
279}
280
336539c2 281void sockpushdata(struct socket *sk, void *buf, size_t size)
282{
283 switch(sk->type)
284 {
285 case SOCK_STREAM:
286 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + size, 1, 1);
287 memmove(sk->inbuf.s.buf + size, sk->inbuf.s.buf, sk->inbuf.s.datasize);
288 memcpy(sk->inbuf.s.buf, buf, size);
289 sk->inbuf.s.datasize += size;
290 break;
291 case SOCK_DGRAM:
292 /* XXX */
293 break;
294 }
295 return;
296}
297
d3372da9 298void *sockgetinbuf(struct socket *sk, size_t *size)
299{
300 void *buf;
301 struct dgrambuf *dbuf;
302
303 switch(sk->type)
304 {
305 case SOCK_STREAM:
306 if((sk->inbuf.s.buf == NULL) || (sk->inbuf.s.datasize == 0))
307 {
308 *size = 0;
309 return(NULL);
310 }
311 buf = sk->inbuf.s.buf;
312 *size = sk->inbuf.s.datasize;
313 sk->inbuf.s.buf = NULL;
314 sk->inbuf.s.bufsize = sk->inbuf.s.datasize = 0;
315 return(buf);
316 case SOCK_DGRAM:
317 if((dbuf = sk->inbuf.d.f) == NULL)
318 return(NULL);
319 sk->inbuf.d.f = dbuf->next;
320 if(dbuf->next == NULL)
321 sk->inbuf.d.l = NULL;
322 buf = dbuf->data;
323 *size = dbuf->size;
324 free(dbuf->addr);
325 free(dbuf);
326 return(buf);
327 }
328 return(NULL);
329}
330
331static void sockrecv(struct socket *sk)
332{
333 int ret, inq;
334 struct dgrambuf *dbuf;
335
336 switch(sk->type)
337 {
338 case SOCK_STREAM:
339#if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
340 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
341 * how to read the inqueue size on other OSs */
342 if(ioctl(sk->fd, SIOCINQ, &inq))
343 {
344 /* I don't really know what could go wrong here, so let's
345 * assume it's transient. */
346 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), sk->fd);
347 inq = 2048;
348 }
349#else
350 inq = 2048;
351#endif
352 if(inq > 65536)
353 inq = 65536;
354 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + inq, 1, 1);
355 ret = read(sk->fd, sk->inbuf.s.buf + sk->inbuf.s.datasize, inq);
356 if(ret < 0)
357 {
358 if((errno == EINTR) || (errno == EAGAIN))
359 return;
5ec60e42 360 CBCHAINDOCB(sk, socket_err, sk, errno);
d3372da9 361 closesock(sk);
362 return;
363 }
364 if(ret == 0)
365 {
5ec60e42 366 CBCHAINDOCB(sk, socket_err, sk, 0);
d3372da9 367 closesock(sk);
368 return;
369 }
370 sk->inbuf.s.datasize += ret;
5ec60e42 371 CBCHAINDOCB(sk, socket_read, sk);
d3372da9 372 break;
373 case SOCK_DGRAM:
374 if(ioctl(sk->fd, SIOCINQ, &inq))
375 {
376 /* I don't really know what could go wrong here, so let's
377 * assume it's transient. */
378 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), sk->fd);
379 return;
380 }
381 dbuf = smalloc(sizeof(*dbuf));
382 dbuf->data = smalloc(inq);
383 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
384 ret = recvfrom(sk->fd, dbuf->data, inq, 0, dbuf->addr, &dbuf->addrlen);
385 if(ret < 0)
386 {
387 free(dbuf->addr);
388 free(dbuf->data);
389 free(dbuf);
390 if((errno == EINTR) || (errno == EAGAIN))
391 return;
5ec60e42 392 CBCHAINDOCB(sk, socket_err, sk, errno);
d3372da9 393 closesock(sk);
394 return;
395 }
396 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
397 * have EOF), but rather an empty packet. I don't know if any
398 * other potential DGRAM protocols might have an EOF
399 * condition, so let's play safe. */
400 if(ret == 0)
401 {
402 free(dbuf->addr);
403 free(dbuf->data);
404 free(dbuf);
405 if(!((sk->family == AF_INET) || (sk->family == AF_INET6)))
406 {
5ec60e42 407 CBCHAINDOCB(sk, socket_err, sk, 0);
d3372da9 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;
5ec60e42 420 CBCHAINDOCB(sk, socket_read, sk);
d3372da9 421 break;
422 }
423}
424
425static void sockflush(struct socket *sk)
426{
427 int ret;
428 struct dgrambuf *dbuf;
429
430 switch(sk->type)
431 {
432 case SOCK_STREAM:
433 if(sk->isrealsocket)
434 ret = send(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
435 else
436 ret = write(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize);
437 if(ret < 0)
438 {
439 /* For now, assume transient error, since
440 * the socket is polled for errors */
441 break;
442 }
443 if(ret > 0)
444 {
445 memmove(sk->outbuf.s.buf, ((char *)sk->outbuf.s.buf) + ret, sk->outbuf.s.datasize -= ret);
5ec60e42 446 CBCHAINDOCB(sk, socket_write, sk);
d3372da9 447 }
448 break;
449 case SOCK_DGRAM:
450 dbuf = sk->outbuf.d.f;
451 if((sk->outbuf.d.f = dbuf->next) == NULL)
452 sk->outbuf.d.l = NULL;
453 sendto(sk->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
454 free(dbuf->data);
455 free(dbuf->addr);
456 free(dbuf);
5ec60e42 457 CBCHAINDOCB(sk, socket_write, sk);
d3372da9 458 break;
459 }
460}
461
462void closesock(struct socket *sk)
463{
464 sk->state = SOCK_STL;
465 close(sk->fd);
466 sk->fd = -1;
467 sk->close = 0;
468}
469
470void sockqueue(struct socket *sk, void *data, size_t size)
471{
472 struct dgrambuf *new;
473
474 if(sk->state == SOCK_STL)
475 return;
476 switch(sk->type)
477 {
478 case SOCK_STREAM:
479 sizebuf(&(sk->outbuf.s.buf), &(sk->outbuf.s.bufsize), sk->outbuf.s.datasize + size, 1, 1);
480 memcpy(sk->outbuf.s.buf + sk->outbuf.s.datasize, data, size);
481 sk->outbuf.s.datasize += size;
482 break;
483 case SOCK_DGRAM:
484 if(sk->remote == NULL)
485 return;
486 new = smalloc(sizeof(*new));
487 new->next = NULL;
488 memcpy(new->data = smalloc(size), data, new->size = size);
489 memcpy(new->addr = smalloc(sk->remotelen), sk->remote, new->addrlen = sk->remotelen);
490 if(sk->outbuf.d.l == NULL)
491 {
492 sk->outbuf.d.l = sk->outbuf.d.f = new;
493 } else {
494 sk->outbuf.d.l->next = new;
495 sk->outbuf.d.l = new;
496 }
497 break;
498 }
499}
500
501size_t sockgetdatalen(struct socket *sk)
502{
503 struct dgrambuf *b;
504 size_t ret;
505
506 switch(sk->type)
507 {
508 case SOCK_STREAM:
509 ret = sk->inbuf.s.datasize;
510 break;
511 case SOCK_DGRAM:
512 ret = 0;
513 for(b = sk->inbuf.d.f; b != NULL; b = b->next)
514 ret += b->size;
515 break;
516 }
517 return(ret);
518}
519
520size_t sockqueuesize(struct socket *sk)
521{
522 struct dgrambuf *b;
523 size_t ret;
524
525 switch(sk->type)
526 {
527 case SOCK_STREAM:
528 ret = sk->outbuf.s.datasize;
529 break;
530 case SOCK_DGRAM:
531 ret = 0;
532 for(b = sk->outbuf.d.f; b != NULL; b = b->next)
533 ret += b->size;
534 break;
535 }
536 return(ret);
537}
538
d3372da9 539/*
540 * The difference between netcslisten() and netcslistenlocal() is that
541 * netcslistenlocal() always listens on the local host, instead of
542 * following proxy/passive mode directions. It is suitable for eg. the
543 * UI channel, while the file sharing networks should, naturally, use
544 * netcslisten() instead.
545*/
546
5ec60e42 547struct socket *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, int (*func)(struct socket *, struct socket *, void *), void *data)
d3372da9 548{
549 struct socket *sk;
66c517d2 550 int intbuf;
d3372da9 551
552 /* I don't know if this is actually correct (it probably isn't),
553 * but since, at on least Linux systems, PF_* are specifically
554 * #define'd to their AF_* counterparts, it allows for a severely
555 * smoother implementation. If it breaks something on your
556 * platform, please tell me so.
557 */
558 if((sk = mksock(name->sa_family, type)) == NULL)
559 return(NULL);
560 sk->state = SOCK_LST;
687b2ee2 561 if(confgetint("net", "reuseaddr"))
562 {
563 intbuf = 1;
564 setsockopt(sk->fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
565 }
d3372da9 566 if(bind(sk->fd, name, namelen) < 0)
567 {
568 putsock(sk);
569 return(NULL);
570 }
571 if(listen(sk->fd, 16) < 0)
572 {
573 putsock(sk);
574 return(NULL);
575 }
5ec60e42 576 if(func != NULL)
577 CBREG(sk, socket_accept, func, NULL, data);
d3372da9 578 return(sk);
579}
580
5ec60e42 581struct socket *netcslisten(int type, struct sockaddr *name, socklen_t namelen, int (*func)(struct socket *, struct socket *, void *), void *data)
c23acc61 582{
583 if(confgetint("net", "mode") == 1)
584 {
585 errno = EOPNOTSUPP;
586 return(NULL);
587 }
c23acc61 588 if(confgetint("net", "mode") == 0)
589 return(netcslistenlocal(type, name, namelen, func, data));
590 errno = EOPNOTSUPP;
591 return(NULL);
592}
593
5ec60e42 594struct socket *netcstcplisten(int port, int local, int (*func)(struct socket *, struct socket *, void *), void *data)
0a1bc5b1 595{
596 struct sockaddr_in addr;
597#ifdef HAVE_IPV6
598 struct sockaddr_in6 addr6;
599#endif
5ec60e42 600 struct socket *(*csfunc)(int, struct sockaddr *, socklen_t, int (*)(struct socket *, struct socket *, void *), void *);
0a1bc5b1 601 struct socket *ret;
602
603 if(local)
604 csfunc = netcslistenlocal;
605 else
606 csfunc = netcslisten;
607#ifdef HAVE_IPV6
608 memset(&addr6, 0, sizeof(addr6));
609 addr6.sin6_family = AF_INET6;
610 addr6.sin6_port = htons(port);
611 addr6.sin6_addr = in6addr_any;
612 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
613 return(ret);
614 if((ret == NULL) && (errno != EAFNOSUPPORT))
615 return(NULL);
616#endif
617 memset(&addr, 0, sizeof(addr));
618 addr.sin_family = AF_INET;
619 addr.sin_port = htons(port);
620 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
621}
622
d3372da9 623struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
624{
625 struct socket *sk;
626 int mode;
627
628 mode = confgetint("net", "mode");
629 if((mode == 0) || (mode == 1))
630 {
631 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
632 return(NULL);
633 if(bind(sk->fd, name, namelen) < 0)
634 {
635 putsock(sk);
636 return(NULL);
637 }
638 sk->state = SOCK_EST;
639 return(sk);
640 }
641 errno = EOPNOTSUPP;
642 return(NULL);
643}
644
645struct socket *netdupsock(struct socket *sk)
646{
647 struct socket *newsk;
648
649 newsk = newsock(sk->type);
650 if((newsk->fd = dup(sk->fd)) < 0)
651 {
652 flog(LOG_WARNING, "could not dup() socket: %s", strerror(errno));
653 putsock(newsk);
654 return(NULL);
655 }
656 newsk->state = sk->state;
657 newsk->ignread = sk->ignread;
658 if(sk->remote != NULL)
659 memcpy(newsk->remote = smalloc(sk->remotelen), sk->remote, newsk->remotelen = sk->remotelen);
660 return(newsk);
661}
662
663void netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
664{
665 if(sk->remote != NULL)
666 free(sk->remote);
667 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
668 sk->ignread = 1;
669}
670
5ec60e42 671struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, int (*func)(struct socket *, int, void *), void *data)
d3372da9 672{
673 struct socket *sk;
674 int mode;
675
676 mode = confgetint("net", "mode");
677 if((mode == 0) || (mode == 1))
678 {
679 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
680 return(NULL);
681 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
682 if(!connect(sk->fd, addr, addrlen))
683 {
684 sk->state = SOCK_EST;
685 func(sk, 0, data);
686 return(sk);
687 }
688 if(errno == EINPROGRESS)
689 {
690 sk->state = SOCK_SYN;
5ec60e42 691 if(func != NULL)
692 CBREG(sk, socket_conn, func, NULL, data);
d3372da9 693 return(sk);
694 }
695 putsock(sk);
696 return(NULL);
697 }
698 errno = EOPNOTSUPP;
699 return(NULL);
700}
701
702int pollsocks(int timeout)
703{
eaa35963 704 int i, num, ret;
705 socklen_t retlen;
d3372da9 706 int newfd;
707 struct pollfd *pfds;
708 struct socket *sk, *next, *newsk;
709 struct sockaddr_storage ss;
710 socklen_t sslen;
711
712 pfds = smalloc(sizeof(*pfds) * (num = numsocks));
713 for(i = 0, sk = sockets; i < num; sk = sk->next)
714 {
715 if(sk->state == SOCK_STL)
716 {
717 num--;
718 continue;
719 }
720 pfds[i].fd = sk->fd;
721 pfds[i].events = 0;
722 if(!sk->ignread)
723 pfds[i].events |= POLLIN;
724 if((sk->state == SOCK_SYN) || (sockqueuesize(sk) > 0))
725 pfds[i].events |= POLLOUT;
726 pfds[i].revents = 0;
727 i++;
728 }
729 ret = poll(pfds, num, timeout);
730 if(ret < 0)
731 {
732 if(errno != EINTR)
733 {
734 flog(LOG_CRIT, "pollsocks: poll errored out: %s", strerror(errno));
735 /* To avoid CPU hogging in case it's bad, which it
736 * probably is. */
737 sleep(1);
738 }
739 free(pfds);
740 return(1);
741 }
742 for(sk = sockets; sk != NULL; sk = next)
743 {
744 next = sk->next;
745 for(i = 0; i < num; i++)
746 {
747 if(pfds[i].fd == sk->fd)
748 break;
749 }
750 if(i == num)
751 continue;
752 switch(sk->state)
753 {
754 case SOCK_LST:
755 if(pfds[i].revents & POLLIN)
756 {
757 sslen = sizeof(ss);
758 if((newfd = accept(sk->fd, (struct sockaddr *)&ss, &sslen)) < 0)
5ec60e42 759 CBCHAINDOCB(sk, socket_err, sk, errno);
d3372da9 760 newsk = newsock(sk->type);
761 newsk->fd = newfd;
762 newsk->family = sk->family;
763 newsk->state = SOCK_EST;
764 memcpy(newsk->remote = smalloc(sslen), &ss, sslen);
765 newsk->remotelen = sslen;
766 putsock(newsk);
5ec60e42 767 CBCHAINDOCB(sk, socket_accept, sk, newsk);
d3372da9 768 }
769 if(pfds[i].revents & POLLERR)
770 {
771 retlen = sizeof(ret);
772 getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
5ec60e42 773 CBCHAINDOCB(sk, socket_err, sk, ret);
d3372da9 774 continue;
775 }
776 break;
777 case SOCK_SYN:
778 if(pfds[i].revents & POLLERR)
779 {
780 retlen = sizeof(ret);
781 getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
5ec60e42 782 CBCHAINDOCB(sk, socket_conn, sk, ret);
d3372da9 783 closesock(sk);
784 continue;
785 }
786 if(pfds[i].revents & (POLLIN | POLLOUT))
787 {
788 sk->state = SOCK_EST;
5ec60e42 789 CBCHAINDOCB(sk, socket_conn, sk, 0);
d3372da9 790 }
791 break;
792 case SOCK_EST:
793 if(pfds[i].revents & POLLERR)
794 {
795 retlen = sizeof(ret);
796 getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
5ec60e42 797 CBCHAINDOCB(sk, socket_err, sk, ret);
d3372da9 798 closesock(sk);
799 continue;
800 }
801 if(pfds[i].revents & POLLIN)
802 sockrecv(sk);
803 if(pfds[i].revents & POLLOUT)
804 {
805 if(sockqueuesize(sk) > 0)
806 sockflush(sk);
807 }
808 break;
809 }
810 if(pfds[i].revents & POLLNVAL)
811 {
812 flog(LOG_CRIT, "BUG: stale socket struct on fd %i", sk->fd);
813 sk->state = SOCK_STL;
814 unlinksock(sk);
815 continue;
816 }
817 if(pfds[i].revents & POLLHUP)
818 {
5ec60e42 819 CBCHAINDOCB(sk, socket_err, sk, 0);
d3372da9 820 closesock(sk);
821 unlinksock(sk);
822 continue;
823 }
824 }
825 free(pfds);
826 for(sk = sockets; sk != NULL; sk = next)
827 {
828 next = sk->next;
829 if(sk->refcount == 1 && (sockqueuesize(sk) == 0))
830 {
831 unlinksock(sk);
832 continue;
833 }
834 if(sk->close && (sockqueuesize(sk) == 0))
835 closesock(sk);
836 if(sk->state == SOCK_STL)
837 {
838 unlinksock(sk);
839 continue;
840 }
841 }
842 return(1);
843}
844
845int socksettos(struct socket *sk, int tos)
846{
b020fb3d 847 int buf;
848
d3372da9 849 if(sk->family == AF_INET)
850 {
b020fb3d 851 switch(tos)
852 {
b198bed6 853 case 0:
854 buf = 0;
855 break;
b020fb3d 856 case SOCK_TOS_MINCOST:
18c1ae1d 857 buf = 0x02;
b020fb3d 858 break;
859 case SOCK_TOS_MAXREL:
18c1ae1d 860 buf = 0x04;
b020fb3d 861 break;
862 case SOCK_TOS_MAXTP:
18c1ae1d 863 buf = 0x08;
b020fb3d 864 break;
865 case SOCK_TOS_MINDELAY:
18c1ae1d 866 buf = 0x10;
b020fb3d 867 break;
868 default:
869 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
870 return(-1);
871 }
872 if(setsockopt(sk->fd, SOL_IP, IP_TOS, &buf, sizeof(buf)) < 0)
d3372da9 873 {
874 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
875 return(-1);
876 }
877 return(0);
878 }
b020fb3d 879 if(sk->family == AF_INET6)
880 {
881 switch(tos)
882 {
b198bed6 883 case 0:
884 buf = 0;
b020fb3d 885 case SOCK_TOS_MINCOST:
886 buf = confgetint("net", "diffserv-mincost");
887 break;
888 case SOCK_TOS_MAXREL:
889 buf = confgetint("net", "diffserv-maxrel");
890 break;
891 case SOCK_TOS_MAXTP:
892 buf = confgetint("net", "diffserv-maxtp");
893 break;
894 case SOCK_TOS_MINDELAY:
895 buf = confgetint("net", "diffserv-mindelay");
896 break;
897 default:
898 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
899 return(-1);
900 }
901 /*
902 On Linux, the API IPv6 flow label management doesn't seem to
903 be entirely complete, so I guess this will have to wait.
904
905 if(setsockopt(...) < 0)
906 {
907 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
908 return(-1);
909 }
910 */
911 return(0);
912 }
d3372da9 913 flog(LOG_WARNING, "could not set TOS on sock of family %i", sk->family);
914 return(1);
915}
916
917struct resolvedata
918{
919 int fd;
920 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
921 void *data;
922 struct sockaddr_storage addr;
923 int addrlen;
924};
925
926static void resolvecb(pid_t pid, int status, struct resolvedata *data)
927{
928 static char buf[80];
929 int ret;
930 struct sockaddr_in *ipv4;
931
932 if(!status)
933 {
934 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
935 {
936 errno = ENONET;
937 data->callback(NULL, 0, data->data);
938 } else {
939 ipv4 = (struct sockaddr_in *)&data->addr;
940 memcpy(&ipv4->sin_addr, buf, 4);
941 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
942 }
943 } else {
944 errno = ENONET;
945 data->callback(NULL, 0, data->data);
946 }
947 close(data->fd);
948 free(data);
949}
950
951int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
952{
953 int i;
954 char *p;
955 int port;
956 int pfd[2];
957 pid_t child;
958 struct resolvedata *rdata;
959 struct sockaddr_in ipv4;
960 struct hostent *he;
961 sigset_t sigset;
962
963 /* IPv4 */
964 port = -1;
965 if((p = strchr(addr, ':')) != NULL)
966 {
967 *p = 0;
968 port = atoi(p + 1);
969 }
970 ipv4.sin_family = AF_INET;
971 ipv4.sin_port = htons(port);
972 if(inet_aton(addr, &ipv4.sin_addr))
973 {
974 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
975 } else {
976 sigemptyset(&sigset);
977 sigaddset(&sigset, SIGCHLD);
978 sigprocmask(SIG_BLOCK, &sigset, NULL);
979 if((pipe(pfd) < 0) || ((child = fork()) < 0))
980 {
981 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
982 return(-1);
983 }
984 if(child == 0)
985 {
986 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
987 for(i = 3; i < FD_SETSIZE; i++)
988 {
989 if(i != pfd[1])
990 close(i);
991 }
992 signal(SIGALRM, SIG_DFL);
993 alarm(30);
994 if((he = gethostbyname(addr)) == NULL)
995 exit(1);
996 write(pfd[1], he->h_addr_list[0], 4);
997 exit(0);
998 } else {
999 close(pfd[1]);
1000 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1001 rdata = smalloc(sizeof(*rdata));
1002 rdata->fd = pfd[0];
1003 rdata->callback = callback;
1004 rdata->data = data;
1005 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1006 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1007 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1008 return(1);
1009 }
1010 }
1011 return(0);
1012}
1013
1014int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1015{
1016 socklen_t len;
1017 struct sockaddr_storage name;
1018
1019 *namebuf = NULL;
1020 if((sk->state == SOCK_STL) || (sk->fd < 0))
1021 return(-1);
1022 len = sizeof(name);
1023 if(getsockname(sk->fd, (struct sockaddr *)&name, &len) < 0)
1024 {
6fb0c6ac 1025 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
d3372da9 1026 return(-1);
1027 }
1028 *namebuf = memcpy(smalloc(len), &name, len);
1029 *lenbuf = len;
1030 return(0);
1031}
1032
eaa35963 1033static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1034{
1035 if(dst->sa_family != src->sa_family)
1036 {
1037 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1038 return;
1039 }
1040 switch(src->sa_family)
1041 {
1042 case AF_INET:
1043 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1044 break;
1045 case AF_INET6:
1046 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1047 break;
1048 default:
1049 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1050 break;
1051 }
1052}
1053
1054static int makepublic(struct sockaddr *addr)
d3372da9 1055{
6fb0c6ac 1056 int ret;
eaa35963 1057 socklen_t plen;
1058 struct sockaddr *pname;
1059
1060 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1061 {
1062 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1063 return(-1);
1064 }
1065 if(ret)
1066 return(0);
1067 sethostaddr(addr, pname);
1068 free(pname);
1069 return(0);
1070}
1071
1072int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1073{
d3372da9 1074 socklen_t len;
6fb0c6ac 1075 struct sockaddr *name;
d3372da9 1076
1077 switch(confgetint("net", "mode"))
1078 {
1079 case 0:
1080 *namebuf = NULL;
1081 if((sk->state == SOCK_STL) || (sk->fd < 0))
d3372da9 1082 {
eaa35963 1083 errno = EBADF;
d3372da9 1084 return(-1);
1085 }
6fb0c6ac 1086 if(!sockgetlocalname(sk, &name, &len))
1087 {
1088 *namebuf = name;
1089 *lenbuf = len;
eaa35963 1090 makepublic(name);
6fb0c6ac 1091 return(0);
1092 }
1093 flog(LOG_ERR, "could not get remotely accessible name by any means");
1094 return(-1);
d3372da9 1095 case 1:
1096 errno = EOPNOTSUPP;
1097 return(-1);
1098 default:
1099 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1100 errno = EOPNOTSUPP;
1101 return(-1);
1102 }
1103}
1104
d29853b1 1105int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1106{
1107 struct sockaddr *name1, *name2;
1108 socklen_t len1, len2;
1109
1110 if(sk->family != sk2->family)
1111 {
1112 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", sk->family, sk2->family);
1113 return(-1);
1114 }
3804379d 1115 if(sockgetremotename(sk, &name1, &len1))
d29853b1 1116 return(-1);
3804379d 1117 if(sockgetremotename(sk2, &name2, &len2)) {
d29853b1 1118 free(name1);
1119 return(-1);
1120 }
1121 sethostaddr(name1, name2);
1122 free(name2);
1123 *namebuf = name1;
1124 *lenbuf = len1;
1125 return(0);
1126}
1127
99a28d47 1128int addreq(struct sockaddr *x, struct sockaddr *y)
1129{
1130 struct sockaddr_un *u1, *u2;
1131 struct sockaddr_in *n1, *n2;
1132#ifdef HAVE_IPV6
1133 struct sockaddr_in6 *s1, *s2;
1134#endif
1135
1136 if(x->sa_family != y->sa_family)
1137 return(0);
1138 switch(x->sa_family) {
1139 case AF_UNIX:
1140 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1141 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1142 return(0);
1143 break;
1144 case AF_INET:
1145 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1146 if(n1->sin_port != n2->sin_port)
1147 return(0);
1148 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1149 return(0);
1150 break;
c8a729d7 1151#ifdef HAVE_IPV6
99a28d47 1152 case AF_INET6:
1153 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1154 if(s1->sin6_port != s2->sin6_port)
1155 return(0);
1156 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1157 return(0);
1158 break;
c8a729d7 1159#endif
99a28d47 1160 }
1161 return(1);
1162}
1163
d3372da9 1164char *formataddress(struct sockaddr *arg, socklen_t arglen)
1165{
1166 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1167 * lowercase letters to 1, so I do this
1168 * instead. */
1169 struct sockaddr_in *ipv4;
1170#ifdef HAVE_IPV6
1171 struct sockaddr_in6 *ipv6;
1172#endif
1173 static char *ret = NULL;
1174 char buf[1024];
1175
1176 if(ret != NULL)
1177 free(ret);
1178 ret = NULL;
1179 switch(arg->sa_family)
1180 {
1181 case AF_UNIX:
1182 UNIX = (struct sockaddr_un *)arg;
1183 ret = sprintf2("%s", UNIX->sun_path);
1184 break;
1185 case AF_INET:
1186 ipv4 = (struct sockaddr_in *)arg;
1187 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1188 return(NULL);
1189 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1190 break;
1191#ifdef HAVE_IPV6
1192 case AF_INET6:
1193 ipv6 = (struct sockaddr_in6 *)arg;
1194 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1195 return(NULL);
fc7f7735 1196 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
d3372da9 1197 break;
1198#endif
1199 default:
1200 errno = EPFNOSUPPORT;
1201 break;
1202 }
1203 return(ret);
1204}
1205
1206#if 0
1207
1208/*
1209 * It was very nice to use this, but it seems
1210 * to mess things up, so I guess it has to go... :-(
1211 */
1212
1213static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1214{
1215 struct sockaddr *arg;
1216 socklen_t arglen;
1217 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1218 * lowercase letters to 1, so I do this
1219 * instead. */
1220 struct sockaddr_in *ipv4;
1221 int ret;
1222
1223 arg = *(struct sockaddr **)(args[0]);
1224 arglen = *(socklen_t *)(args[1]);
1225 switch(arg->sa_family)
1226 {
1227 case AF_UNIX:
1228 UNIX = (struct sockaddr_un *)arg;
1229 ret = fprintf(stream, "%s", UNIX->sun_path);
1230 break;
1231 case AF_INET:
1232 ipv4 = (struct sockaddr_in *)arg;
1233 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1234 break;
1235 default:
1236 ret = -1;
1237 errno = EPFNOSUPPORT;
1238 break;
1239 }
1240 return(ret);
1241}
1242
1243static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1244{
1245 if(n > 0)
1246 argtypes[0] = PA_POINTER;
1247 if(n > 1)
1248 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1249 * be an int, so I guess this should be
1250 * safe. */
1251 return(2);
1252}
1253#endif
1254
1255static int init(int hup)
1256{
1257 if(!hup)
1258 {
1259 /*
1260 if(register_printf_function('N', formataddress, formataddress_arginfo))
1261 {
1262 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1263 return(1);
1264 }
1265 */
1266 }
1267 return(0);
1268}
1269
1270static void terminate(void)
1271{
1272 while(sockets != NULL)
1273 unlinksock(sockets);
1274}
1275
1276static struct module me =
1277{
1278 .name = "net",
1279 .conf =
1280 {
1281 .vars = myvars
1282 },
1283 .init = init,
1284 .terminate = terminate
1285};
1286
1287MODULE(me)
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