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Fixed HTTP-client query-string handling bug.
[doldaconnect.git] / daemon / net.c
CommitLineData
d3372da9 1/*
2 * Dolda Connect - Modular multiuser Direct Connect-style client
302a2600 3 * Copyright (C) 2004 Fredrik Tolf <fredrik@dolda2000.com>
d3372da9 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>
72a7835e 31#include <sys/select.h>
d3372da9 32#include <arpa/inet.h>
33#include <netinet/in.h>
34#include <netdb.h>
35#include <sys/signal.h>
7ab36fbd 36#include <sys/stat.h> /* For rebindunix() */
d3372da9 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{
d9f89ef5 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. */
d3372da9 55 {CONF_VAR_INT, "mode", {.num = 0}},
d9f89ef5 56 /** Set the SO_REUSEADDR socket option on listening sockets, so
57 * that dead TCP connections waiting for timeout are ignored. */
347d6d76 58 {CONF_VAR_BOOL, "reuseaddr", {.num = 0}},
d9f89ef5 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. */
d3372da9 63 {CONF_VAR_IPV4, "visibleipv4", {.ipv4 = {0}}},
d9f89ef5 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. */
d3372da9 68 {CONF_VAR_STRING, "publicif", {.str = L""}},
d9f89ef5 69 /** The Diffserv value to use on IPv6 connections when the
70 * minimize cost TOS value is used (see the TOS VALUES
71 * section). */
b020fb3d 72 {CONF_VAR_INT, "diffserv-mincost", {.num = 0}},
d9f89ef5 73 /** The Diffserv value to use on IPv6 connections when the
74 * maximize reliability TOS value is used (see the TOS VALUES
75 * section). */
b020fb3d 76 {CONF_VAR_INT, "diffserv-maxrel", {.num = 0}},
d9f89ef5 77 /** The Diffserv value to use on IPv6 connections when the
78 * maximize throughput TOS value is used (see the TOS VALUES
79 * section). */
b020fb3d 80 {CONF_VAR_INT, "diffserv-maxtp", {.num = 0}},
d9f89ef5 81 /** The Diffserv value to use on IPv6 connections when the
82 * minimize delay TOS value is used (see the TOS VALUES
83 * section). */
b020fb3d 84 {CONF_VAR_INT, "diffserv-mindelay", {.num = 0}},
f966ec56 85 /** If enabled, the IP TOS interface will be used to set Diffserv
56e7e7e7 86 * codepoints on IPv4 sockets, by shifting the DSCP value two bits
c8c6be24
FT		 87 * to the left (remember, the DSCP field in the IPv4 header is
88 * defined as the 6 uppermost bits of the TOS field, the lower two
89 * being left for ECN). This may only work on Linux. */
f966ec56 90 {CONF_VAR_BOOL, "dscp-tos", {.num = 0}},
d3372da9 91 {CONF_VAR_END}
92};
93
02a705ad
FT		 94#define UFD_SOCK 0
95#define UFD_PIPE 1
96#define UFD_LISTEN 2
97
98struct scons {
99 struct scons *n, *p;
100 struct socket *s;
101};
102
103struct ufd {
104 struct ufd *next, *prev;
105 int fd;
106 int type;
107 int ignread;
108 struct socket *sk;
109 union {
110 struct {
111 int family;
112 int type;
113 struct sockaddr *remote;
114 socklen_t remotelen;
115 struct {
116 uid_t uid;
117 gid_t gid;
118 } ucred;
119 } s;
120 struct {
121 struct lport *lp;
122 int family;
123 } l;
124 } d;
125};
126
40c21c4f
FT		 127static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf);
128
02a705ad
FT		 129static struct ufd *ufds = NULL;
130static struct scons *rbatch, *wbatch, *cbatch;
d3372da9 131int numsocks = 0;
132
133/* XXX: Get autoconf for all this... */
134int getpublicaddr(int af, struct sockaddr **addr, socklen_t *lenbuf)
135{
136 struct sockaddr_in *ipv4;
137 struct configvar *var;
138 void *bufend;
139 int sock;
140 struct ifconf conf;
141 struct ifreq *ifr, req;
142 char *pif;
143
144 if(af == AF_INET)
145 {
146 var = confgetvar("net", "visibleipv4");
147 if(var->val.ipv4.s_addr != 0)
148 {
149 ipv4 = smalloc(sizeof(*ipv4));
150 ipv4->sin_family = AF_INET;
151 ipv4->sin_addr.s_addr = var->val.ipv4.s_addr;
152 *addr = (struct sockaddr *)ipv4;
153 *lenbuf = sizeof(*ipv4);
154 return(0);
155 }
bcb73bb3 156 if((pif = icswcstombs(confgetstr("net", "publicif"), NULL, NULL)) == NULL)
d3372da9 157 {
158 flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno));
159 return(-1);
160 }
6fb0c6ac 161 if(!strcmp(pif, ""))
162 return(1);
d3372da9 163 if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
164 return(-1);
165 conf.ifc_buf = smalloc(conf.ifc_len = 65536);
166 if(ioctl(sock, SIOCGIFCONF, &conf) < 0)
167 {
168 free(conf.ifc_buf);
169 close(sock);
170 return(-1);
171 }
172 bufend = ((char *)conf.ifc_buf) + conf.ifc_len;
173 ipv4 = NULL;
174 for(ifr = conf.ifc_ifcu.ifcu_req; (void *)ifr < bufend; ifr++)
175 {
1315d02a 176 if(strcmp(ifr->ifr_name, pif))
6fb0c6ac 177 continue;
d3372da9 178 memset(&req, 0, sizeof(req));
179 memcpy(req.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
180 if(ioctl(sock, SIOCGIFFLAGS, &req) < 0)
6fb0c6ac 181 break;
182 if(!(req.ifr_flags & IFF_UP))
d3372da9 183 {
6fb0c6ac 184 flog(LOG_WARNING, "public interface is down");
185 break;
d3372da9 186 }
6fb0c6ac 187 if(ifr->ifr_addr.sa_family != AF_INET)
d3372da9 188 {
6fb0c6ac 189 flog(LOG_WARNING, "address of the public interface is not AF_INET");
190 break;
d3372da9 191 }
6fb0c6ac 192 ipv4 = smalloc(sizeof(*ipv4));
193 memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr));
194 break;
d3372da9 195 }
bcb73bb3 196 free(conf.ifc_buf);
d3372da9 197 close(sock);
198 if(ipv4 != NULL)
199 {
200 *addr = (struct sockaddr *)ipv4;
201 *lenbuf = sizeof(*ipv4);
202 return(0);
203 }
204 errno = ENETDOWN;
205 return(-1);
206 }
6fb0c6ac 207 return(1);
d3372da9 208}
209
02a705ad 210static struct socket *newsock1(int dgram)
d3372da9 211{
212 struct socket *new;
213
02a705ad
FT		 214 new = memset(smalloc(sizeof(*new)), 0, sizeof(*new));
215 new->refcount = 1;
d3372da9 216 new->state = -1;
02a705ad 217 new->dgram = dgram;
81286a22 218 new->maxbuf = 65536;
d3372da9 219 numsocks++;
220 return(new);
221}
222
02a705ad
FT		 223static struct socket *sockpair(int dgram)
224{
225 struct socket *s1, *s2;
226
227 s1 = newsock1(dgram);
228 s2 = newsock1(dgram);
229 s1->back = s2;
230 s2->back = s1;
231 putsock(s2);
232 return(s1);
233}
234
235static void sksetstate(struct socket *sk, int state)
236{
237 sk->state = state;
238 sk->back->state = state;
239}
240
1ce5968e
FT		 241struct socket *netsockpipe(void)
242{
243 struct socket *sk;
244
245 sk = sockpair(0);
246 sksetstate(sk, SOCK_EST);
247 return(sk);
248}
249
02a705ad
FT		 250static void closeufd(struct ufd *ufd)
251{
252 if(ufd->fd != -1)
253 close(ufd->fd);
254 ufd->fd = -1;
255}
256
257static void freeufd(struct ufd *ufd)
258{
259 if(ufd->next != NULL)
260 ufd->next->prev = ufd->prev;
261 if(ufd->prev != NULL)
262 ufd->prev->next = ufd->next;
263 if(ufd == ufds)
264 ufds = ufd->next;
265 closeufd(ufd);
5afb0d14
FT		 266 if(ufd->sk != NULL)
267 putsock(ufd->sk);
02a705ad
FT		 268 if(ufd->type == UFD_SOCK) {
269 if(ufd->d.s.remote != NULL)
270 free(ufd->d.s.remote);
271 }
272 free(ufd);
273}
274
275static struct ufd *mkufd(int fd, int type, struct socket *sk)
276{
277 struct ufd *ufd;
278
279 ufd = memset(smalloc(sizeof(*ufd)), 0, sizeof(*ufd));
280 ufd->fd = fd;
5afb0d14 281 ufd->type = type;
02a705ad
FT		 282 if(sk != NULL) {
283 getsock(ufd->sk = sk);
284 sk->ufd = ufd;
285 }
286 if(type == UFD_SOCK) {
287 ufd->d.s.ucred.uid = -1;
288 ufd->d.s.ucred.gid = -1;
289 }
290 ufd->next = ufds;
291 if(ufds)
292 ufds->prev = ufd;
293 ufds = ufd;
294 return(ufd);
295}
296
297static struct ufd *dupufd(struct ufd *ufd)
298{
299 struct ufd *nufd;
300 struct socket *nsk;
301
302 if(ufd->sk != NULL)
303 nsk = sockpair(ufd->sk->dgram);
304 else
305 nsk = NULL;
306 nufd = mkufd(ufd->fd, ufd->type, nsk);
307 if(nsk != NULL)
308 putsock(nsk);
309 if((nufd->fd = dup(ufd->fd)) < 0)
310 {
311 flog(LOG_WARNING, "could not dup() fd: %s", strerror(errno));
312 freeufd(nufd);
313 return(NULL);
314 }
5afb0d14 315 sksetstate(nsk, SOCK_EST);
02a705ad
FT		 316 if(ufd->type == UFD_SOCK) {
317 nufd->d.s.family = ufd->d.s.family;
318 nufd->d.s.type = ufd->d.s.type;
319 nufd->d.s.ucred.uid = ufd->d.s.ucred.uid;
320 nufd->d.s.ucred.gid = ufd->d.s.ucred.gid;
321 if(ufd->d.s.remote != NULL)
322 nufd->d.s.remote = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, nufd->d.s.remotelen = ufd->d.s.remotelen);
323 } else if(ufd->type == UFD_LISTEN) {
324 nufd->d.l.family = ufd->d.l.family;
325 }
326 return(nufd);
327}
328
d3372da9 329static struct socket *mksock(int domain, int type)
330{
331 int fd;
02a705ad
FT		 332 struct socket *sk;
333 struct ufd *ufd;
d3372da9 334
335 if((fd = socket(domain, type, 0)) < 0)
336 {
337 flog(LOG_CRIT, "could not create socket: %s", strerror(errno));
338 return(NULL);
339 }
02a705ad
FT		 340 sk = sockpair(type == SOCK_DGRAM);
341 ufd = mkufd(fd, UFD_SOCK, sk);
342 ufd->d.s.family = domain;
343 ufd->d.s.type = type;
d3372da9 344 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
02a705ad 345 return(sk);
d3372da9 346}
347
348struct socket *wrapsock(int fd)
349{
02a705ad
FT		 350 struct socket *sk;
351 struct ufd *ufd;
d3372da9 352
02a705ad
FT		 353 sk = sockpair(0);
354 ufd = mkufd(fd, UFD_PIPE, sk->back);
355 sksetstate(sk, SOCK_EST);
d3372da9 356 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
02a705ad 357 return(sk);
d3372da9 358}
359
360void getsock(struct socket *sk)
361{
362 sk->refcount++;
363}
364
b2e73d7b
FT		 365static void sockdebug(int level, struct socket *sk, char *format, ...)
366{
367 va_list args;
fc8e5171 368 char *tb;
b2e73d7b 369
fc8e5171 370 if((sk->dbgnm == NULL) || (level > sk->dbglvl))
b2e73d7b
FT		 371 return;
372 va_start(args, format);
fc8e5171 373 tb = vsprintf2(format, args);
b2e73d7b 374 va_end(args);
fc8e5171
FT		 375 fprintf(stderr, "%s: %s\n", sk->dbgnm, tb);
376 free(tb);
b2e73d7b
FT		 377}
378
379void socksetdebug(struct socket *sk, int level, char *nm, ...)
380{
381 va_list args;
382 char *tb;
383
384 va_start(args, nm);
385 tb = vsprintf2(nm, args);
386 va_end(args);
387 sk->dbgnm = sprintf2("%s (f)", tb);
388 sk->back->dbgnm = sprintf2("%s (b)", tb);
389 free(tb);
390 sk->dbglvl = level;
391 sk->back->dbglvl = level;
fc8e5171 392 sockdebug(1, sk, "enabled debugging");
b2e73d7b
FT		 393}
394
02a705ad 395static void freesock(struct socket *sk)
d3372da9 396{
397 struct dgrambuf *buf;
398
b2e73d7b 399 sockdebug(1, sk, "freeing socket");
02a705ad
FT		 400 if(sk->dgram) {
401 while((buf = sk->buf.d.f) != NULL) {
402 sk->buf.d.f = buf->next;
403 freedgbuf(buf);
d3372da9 404 }
02a705ad
FT		 405 } else {
406 if(sk->buf.s.buf != NULL)
407 free(sk->buf.s.buf);
408 }
b2e73d7b
FT		 409 if(sk->dbgnm != NULL)
410 free(sk->dbgnm);
02a705ad
FT		 411 free(sk);
412 numsocks--;
413}
414
415void putsock(struct socket *sk)
416{
7dddb551
FT		 417 struct socket *back;
418
02a705ad
FT		 419 if(--(sk->refcount) < 0) {
420 flog(LOG_CRIT, "BUG: socket refcount < 0");
421 abort();
422 }
423 if((sk->refcount == 0) && (sk->back->refcount == 0)) {
7dddb551 424 back = sk->back;
02a705ad 425 freesock(sk);
7dddb551 426 freesock(back);
02a705ad
FT		 427 }
428}
429
1ff9e8ea
FT		 430void quitsock(struct socket *sk)
431{
432 sk->readcb = NULL;
433 sk->writecb = NULL;
434 sk->errcb = NULL;
435 putsock(sk);
436}
437
02a705ad
FT		 438static void linksock(struct scons **list, struct socket *sk)
439{
440 struct scons *sc;
441
442 for(sc = *list; sc != NULL; sc = sc->n) {
443 if(sc->s == sk)
444 return;
d3372da9 445 }
02a705ad
FT		 446 sc = smalloc(sizeof(*sc));
447 getsock(sc->s = sk);
448 sc->n = *list;
449 sc->p = NULL;
450 if(*list)
451 (*list)->p = sc;
452 *list = sc;
d3372da9 453}
454
336539c2 455void sockpushdata(struct socket *sk, void *buf, size_t size)
456{
02a705ad
FT		 457 if(size == 0)
458 return;
459 if(sk->dgram) {
336539c2 460 /* XXX */
02a705ad
FT		 461 } else {
462 sizebuf(&sk->buf.s.buf, &sk->buf.s.bufsize, sk->buf.s.datasize + size, 1, 1);
463 memmove(sk->buf.s.buf + size, sk->buf.s.buf, sk->buf.s.datasize);
464 memcpy(sk->buf.s.buf, buf, size);
465 sk->buf.s.datasize += size;
466 linksock(&rbatch, sk);
336539c2 467 }
02a705ad
FT		 468}
469
470/* Read as the preterite of `read' */
471void sockread(struct socket *sk)
472{
5afb0d14
FT		 473 if((sockgetdatalen(sk) == 0) && (sk->eos == 1))
474 linksock(&rbatch, sk);
02a705ad
FT		 475 linksock(&wbatch, sk->back);
476}
477
478void freedgbuf(struct dgrambuf *dg)
479{
480 if(dg->data != NULL)
481 free(dg->data);
482 if(dg->addr != NULL)
483 free(dg->addr);
484 free(dg);
485}
486
487struct dgrambuf *sockgetdgbuf(struct socket *sk)
488{
489 struct dgrambuf *dbuf;
490
491 if((dbuf = sk->buf.d.f) == NULL)
492 return(NULL);
493 sk->buf.d.f = dbuf->next;
494 if(dbuf->next == NULL)
495 sk->buf.d.l = NULL;
496 dbuf->next = NULL;
497 sockread(sk);
498 return(dbuf);
336539c2 499}
500
d3372da9 501void *sockgetinbuf(struct socket *sk, size_t *size)
502{
503 void *buf;
504 struct dgrambuf *dbuf;
505
02a705ad
FT		 506 if(sk->dgram) {
507 dbuf = sockgetdgbuf(sk);
d3372da9 508 buf = dbuf->data;
509 *size = dbuf->size;
510 free(dbuf->addr);
511 free(dbuf);
02a705ad
FT		 512 } else {
513 if((sk->buf.s.buf == NULL) || (sk->buf.s.datasize == 0))
514 {
515 *size = 0;
b2e73d7b 516 sockdebug(2, sk, "read 0 bytes", *size);
02a705ad
FT		 517 return(NULL);
518 }
519 buf = sk->buf.s.buf;
520 *size = sk->buf.s.datasize;
521 sk->buf.s.buf = NULL;
522 sk->buf.s.bufsize = sk->buf.s.datasize = 0;
523 sockread(sk);
d3372da9 524 }
fc8e5171 525 sockdebug(2, sk, "read %zi bytes", *size);
02a705ad
FT		 526 return(buf);
527}
528
529void sockqueue(struct socket *sk, void *data, size_t size)
530{
531 struct dgrambuf *new;
532 struct sockaddr *remote;
533 socklen_t remotelen;
534
fc8e5171 535 sockdebug(2, sk, "queued %zi bytes", size);
02a705ad
FT		 536 if(size == 0)
537 return;
538 if(sk->state == SOCK_STL)
539 return;
540 if(sk->dgram) {
541 if(sockpeeraddr(sk, &remote, &remotelen))
542 return;
543 new = smalloc(sizeof(*new));
544 new->next = NULL;
545 memcpy(new->data = smalloc(size), data, new->size = size);
546 new->addr = remote;
547 new->addrlen = remotelen;
548 if(sk->back->buf.d.l == NULL)
549 {
550 sk->back->buf.d.l = sk->back->buf.d.f = new;
551 } else {
552 sk->back->buf.d.l->next = new;
553 sk->back->buf.d.l = new;
554 }
555 } else {
556 sizebuf(&(sk->back->buf.s.buf), &(sk->back->buf.s.bufsize), sk->back->buf.s.datasize + size, 1, 1);
557 memcpy(sk->back->buf.s.buf + sk->back->buf.s.datasize, data, size);
558 sk->back->buf.s.datasize += size;
559 }
560 linksock(&rbatch, sk->back);
561}
562
563void sockqueuedg(struct socket *sk, struct dgrambuf *dg)
564{
565 if(sk->state == SOCK_STL) {
566 freedgbuf(dg);
567 return;
568 }
569 if(!sk->dgram) {
570 flog(LOG_ERR, "BUG: sockqueuedg called on non-dgram socket");
571 freedgbuf(dg);
572 return;
573 }
574 dg->next = NULL;
575 if(sk->back->buf.d.l == NULL)
576 {
577 sk->back->buf.d.l = sk->back->buf.d.f = dg;
578 } else {
579 sk->back->buf.d.l->next = dg;
580 sk->back->buf.d.l = dg;
581 }
582 linksock(&rbatch, sk->back);
583}
584
40c21c4f 585void sockerror(struct socket *sk, int en)
02a705ad
FT		 586{
587 sksetstate(sk, SOCK_STL);
588 if(sk->back->errcb != NULL)
589 sk->back->errcb(sk->back, en, sk->back->data);
d3372da9 590}
591
02a705ad 592static void recvcmsg(struct ufd *ufd, struct msghdr *msg)
9e5f2b29 593{
594 struct cmsghdr *cmsg;
9e5f2b29 595
596 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
597 {
a8c5ada6 598#if UNIX_AUTH_STYLE == 1
9e5f2b29 599 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
600 {
a8c5ada6 601 struct ucred *cred;
02a705ad 602 if(ufd->d.s.ucred.uid == -1)
9e5f2b29 603 {
604 cred = (struct ucred *)CMSG_DATA(cmsg);
02a705ad
FT		 605 ufd->d.s.ucred.uid = cred->uid;
606 ufd->d.s.ucred.gid = cred->gid;
9e5f2b29 607 }
608 }
a8c5ada6 609#endif
9e5f2b29 610 }
611}
612
02a705ad
FT		 613static int ufddgram(struct ufd *ufd)
614{
615 int dgram;
616
617 if(ufd->type == UFD_SOCK) {
618 dgram = ufd->d.s.type == SOCK_DGRAM;
619 } else if(ufd->type == UFD_PIPE) {
620 dgram = 0;
621 } else {
622 flog(LOG_ERR, "BUG: calling ufddgram on ufd of bad type %i", ufd->type);
623 return(-1);
624 }
625 if(ufd->sk == NULL) {
626 flog(LOG_ERR, "BUG: calling ufddgram on socketless ufd (type %i)", ufd->type);
627 return(-1);
628 }
629 if(dgram != ufd->sk->dgram) {
630 flog(LOG_ERR, "BUG: ufd/socket dgram value mismatch");
631 return(-1);
632 }
633 return(dgram);
634}
635
636static void sockrecv(struct ufd *ufd)
d3372da9 637{
638 int ret, inq;
02a705ad 639 int dgram;
d3372da9 640 struct dgrambuf *dbuf;
9e5f2b29 641 struct msghdr msg;
642 char cbuf[65536];
643 struct iovec bufvec;
02a705ad 644 void *buf;
d3372da9 645
9e5f2b29 646 memset(&msg, 0, sizeof(msg));
647 msg.msg_iov = &bufvec;
648 msg.msg_iovlen = 1;
649 msg.msg_control = cbuf;
650 msg.msg_controllen = sizeof(cbuf);
02a705ad
FT		 651 if((dgram = ufddgram(ufd)) < 0)
652 return;
653 if(dgram) {
9e5f2b29 654#if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
02a705ad 655 if(ioctl(ufd->fd, SIOCINQ, &inq))
d3372da9 656 {
657 /* I don't really know what could go wrong here, so let's
658 * assume it's transient. */
02a705ad 659 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), ufd->fd);
d3372da9 660 return;
661 }
9e5f2b29 662#else
663 inq = 65536;
664#endif
d3372da9 665 dbuf = smalloc(sizeof(*dbuf));
666 dbuf->data = smalloc(inq);
667 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
9e5f2b29 668 msg.msg_name = dbuf->addr;
669 msg.msg_namelen = dbuf->addrlen;
670 bufvec.iov_base = dbuf->data;
671 bufvec.iov_len = inq;
02a705ad 672 ret = recvmsg(ufd->fd, &msg, 0);
9e5f2b29 673 dbuf->addrlen = msg.msg_namelen;
d3372da9 674 if(ret < 0)
675 {
02a705ad 676 freedgbuf(dbuf);
d3372da9 677 if((errno == EINTR) || (errno == EAGAIN))
678 return;
02a705ad
FT		 679 closeufd(ufd);
680 sockerror(ufd->sk, errno);
d3372da9 681 return;
682 }
9e5f2b29 683 if(msg.msg_flags & MSG_CTRUNC)
684 flog(LOG_DEBUG, "ancillary data was truncated");
685 else
02a705ad 686 recvcmsg(ufd, &msg);
d3372da9 687 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
688 * have EOF), but rather an empty packet. I don't know if any
689 * other potential DGRAM protocols might have an EOF
690 * condition, so let's play safe. */
691 if(ret == 0)
692 {
02a705ad
FT		 693 freedgbuf(dbuf);
694 if((ufd->type != UFD_SOCK) || !((ufd->d.s.family == AF_INET) || (ufd->d.s.family == AF_INET6)))
d3372da9 695 {
40c21c4f 696 closesock(ufd->sk);
02a705ad 697 closeufd(ufd);
d3372da9 698 }
699 return;
700 }
701 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
702 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
703 dbuf->next = NULL;
02a705ad
FT		 704 sockqueuedg(ufd->sk, dbuf);
705 } else {
706#if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
707 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
708 * how to read the inqueue size on other OSs */
709 if(ufd->type == UFD_SOCK) {
710 if(ioctl(ufd->fd, SIOCINQ, &inq))
711 {
712 /* I don't really know what could go wrong here, so let's
713 * assume it's transient. */
714 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), ufd->fd);
715 inq = 2048;
716 }
717 } else {
718 /* There are perils when trying to use SIOCINQ on files >2GiB... */
719 inq = 65536;
720 }
721#else
722 inq = 2048;
723#endif
724 if(inq > 65536)
725 inq = 65536;
726 /* This part could be optimized by telling the kernel to read
727 * directly into ufd->sk->back->buf, but that would be uglier
728 * by not using the socket function interface. */
729 buf = smalloc(inq);
730 if(ufd->type == UFD_SOCK)
731 {
732 bufvec.iov_base = buf;
733 bufvec.iov_len = inq;
734 ret = recvmsg(ufd->fd, &msg, 0);
735 } else {
736 ret = read(ufd->fd, buf, inq);
737 msg.msg_controllen = 0;
738 msg.msg_flags = 0;
739 }
740 if(ret < 0)
741 {
742 free(buf);
743 if((errno == EINTR) || (errno == EAGAIN))
744 return;
745 closeufd(ufd);
746 sockerror(ufd->sk, errno);
747 return;
748 }
749 if(msg.msg_flags & MSG_CTRUNC)
750 flog(LOG_DEBUG, "ancillary data was truncated");
d3372da9 751 else
02a705ad
FT		 752 recvcmsg(ufd, &msg);
753 if(ret == 0)
754 {
755 free(buf);
756 closeufd(ufd);
40c21c4f 757 closesock(ufd->sk);
02a705ad
FT		 758 return;
759 }
760 sockqueue(ufd->sk, buf, ret);
761 free(buf);
d3372da9 762 }
763}
764
89d650f1 765static int sockflush(struct ufd *ufd)
d3372da9 766{
767 int ret;
768 struct dgrambuf *dbuf;
02a705ad 769 int dgram;
d3372da9 770
89d650f1
FT		 771 if((dgram = ufddgram(ufd)) < 0) {
772 errno = EBADFD;
773 return(-1);
774 }
02a705ad
FT		 775 if(dgram) {
776 dbuf = sockgetdgbuf(ufd->sk);
777 sendto(ufd->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
778 freedgbuf(dbuf);
779 } else {
780 if(ufd->type == UFD_SOCK)
781 ret = send(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
d3372da9 782 else
02a705ad 783 ret = write(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize);
89d650f1
FT		 784 if(ret < 0)
785 return(-1);
02a705ad
FT		 786 if(ret > 0) {
787 memmove(ufd->sk->buf.s.buf, ((char *)ufd->sk->buf.s.buf) + ret, ufd->sk->buf.s.datasize -= ret);
788 sockread(ufd->sk);
d3372da9 789 }
d3372da9 790 }
89d650f1 791 return(0);
d3372da9 792}
793
794void closesock(struct socket *sk)
795{
b2e73d7b 796 sockdebug(1, sk, "closed");
02a705ad 797 sksetstate(sk, SOCK_STL);
40c21c4f
FT		 798 if(sk->back->eos == 0)
799 sk->back->eos = 1;
800 linksock(&rbatch, sk->back);
d3372da9 801}
802
803size_t sockgetdatalen(struct socket *sk)
804{
805 struct dgrambuf *b;
806 size_t ret;
807
02a705ad 808 if(sk->dgram) {
d3372da9 809 ret = 0;
02a705ad 810 for(b = sk->buf.d.f; b != NULL; b = b->next)
d3372da9 811 ret += b->size;
02a705ad
FT		 812 } else {
813 ret = sk->buf.s.datasize;
d3372da9 814 }
815 return(ret);
816}
817
81286a22
FT		 818/* size_t sockqueuesize(struct socket *sk) */
819/* { */
820/* return(sockgetdatalen(sk->back)); */
821/* } */
822
1ff9e8ea
FT		 823size_t socktqueuesize(struct socket *sk)
824{
825 size_t ret;
826
827 ret = 0;
828 while(1) {
829 ret += sockgetdatalen(sk->back);
830 if((sk = sk->back->pnext) == NULL)
831 return(ret);
832 }
833}
834
81286a22 835ssize_t sockqueueleft(struct socket *sk)
d3372da9 836{
81286a22 837 return(sk->back->maxbuf - sockgetdatalen(sk->back));
d3372da9 838}
839
d3372da9 840/*
7ab36fbd 841 * Seriously, I don't know if it's naughty or not to remove
842 * pre-existing Unix sockets.
843 */
02a705ad 844static int rebindunix(struct ufd *ufd, struct sockaddr *name, socklen_t namelen)
7ab36fbd 845{
846 struct sockaddr_un *un;
847 struct stat sb;
848
02a705ad 849 if((ufd->d.l.family != AF_UNIX) || (name->sa_family != PF_UNIX))
7ab36fbd 850 return(-1);
851 un = (struct sockaddr_un *)name;
852 if(stat(un->sun_path, &sb))
853 return(-1);
854 if(!S_ISSOCK(sb.st_mode))
855 return(-1);
856 if(unlink(un->sun_path))
857 return(-1);
02a705ad 858 if(bind(ufd->fd, name, namelen) < 0)
7ab36fbd 859 return(-1);
860 return(0);
861}
862
f96d0914
FT		 863void closelport(struct lport *lp)
864{
40c21c4f
FT		 865 struct ufd *ufd;
866 struct sockaddr_un *un;
867
868 ufd = lp->ufd;
869 if((ufd->d.l.family == AF_UNIX) && !getlocalname(ufd->fd, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX) && strchr(un->sun_path, '/')) {
870 if(unlink(un->sun_path))
871 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
872 }
f96d0914
FT		 873 freeufd(lp->ufd);
874}
875
7ab36fbd 876/*
d3372da9 877 * The difference between netcslisten() and netcslistenlocal() is that
878 * netcslistenlocal() always listens on the local host, instead of
879 * following proxy/passive mode directions. It is suitable for eg. the
880 * UI channel, while the file sharing networks should, naturally, use
881 * netcslisten() instead.
882*/
883
02a705ad 884struct lport *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
d3372da9 885{
02a705ad
FT		 886 struct lport *lp;
887 struct ufd *ufd;
888 int fd;
66c517d2 889 int intbuf;
d3372da9 890
891 /* I don't know if this is actually correct (it probably isn't),
892 * but since, at on least Linux systems, PF_* are specifically
893 * #define'd to their AF_* counterparts, it allows for a severely
894 * smoother implementation. If it breaks something on your
895 * platform, please tell me so.
896 */
02a705ad 897 if((fd = socket(name->sa_family, type, 0)) < 0)
d3372da9 898 return(NULL);
02a705ad 899 if(confgetint("net", "reuseaddr")) {
687b2ee2 900 intbuf = 1;
02a705ad 901 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
687b2ee2 902 }
02a705ad 903 ufd = mkufd(fd, UFD_LISTEN, NULL);
02a705ad 904 ufd->d.l.family = name->sa_family;
f96d0914
FT		 905 lp = memset(smalloc(sizeof(*lp)), 0, sizeof(*lp));
906 lp->ufd = ufd;
907 ufd->d.l.lp = lp;
02a705ad
FT		 908 if((bind(fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(ufd, name, namelen) < 0))) {
909 freeufd(ufd);
d3372da9 910 return(NULL);
911 }
02a705ad 912 if(listen(fd, 16) < 0)
d3372da9 913 {
02a705ad 914 freeufd(ufd);
d3372da9 915 return(NULL);
916 }
02a705ad
FT		 917 lp->acceptcb = func;
918 lp->data = data;
919 return(lp);
d3372da9 920}
921
02a705ad 922struct lport *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
c23acc61 923{
924 if(confgetint("net", "mode") == 1)
925 {
926 errno = EOPNOTSUPP;
927 return(NULL);
928 }
c23acc61 929 if(confgetint("net", "mode") == 0)
930 return(netcslistenlocal(type, name, namelen, func, data));
931 errno = EOPNOTSUPP;
932 return(NULL);
933}
934
02a705ad 935struct lport *netcstcplisten(int port, int local, void (*func)(struct lport *, struct socket *, void *), void *data)
0a1bc5b1 936{
937 struct sockaddr_in addr;
938#ifdef HAVE_IPV6
939 struct sockaddr_in6 addr6;
940#endif
02a705ad
FT		 941 struct lport *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct lport *, struct socket *, void *), void *);
942 struct lport *ret;
0a1bc5b1 943
944 if(local)
945 csfunc = netcslistenlocal;
946 else
947 csfunc = netcslisten;
948#ifdef HAVE_IPV6
949 memset(&addr6, 0, sizeof(addr6));
950 addr6.sin6_family = AF_INET6;
951 addr6.sin6_port = htons(port);
952 addr6.sin6_addr = in6addr_any;
953 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
954 return(ret);
955 if((ret == NULL) && (errno != EAFNOSUPPORT))
956 return(NULL);
957#endif
958 memset(&addr, 0, sizeof(addr));
959 addr.sin_family = AF_INET;
960 addr.sin_port = htons(port);
961 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
962}
963
d3372da9 964struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
965{
966 struct socket *sk;
967 int mode;
968
969 mode = confgetint("net", "mode");
970 if((mode == 0) || (mode == 1))
971 {
972 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
973 return(NULL);
02a705ad 974 if(bind(sk->ufd->fd, name, namelen) < 0)
d3372da9 975 {
976 putsock(sk);
977 return(NULL);
978 }
02a705ad
FT		 979 sksetstate(sk, SOCK_EST);
980 return(sk->back);
d3372da9 981 }
982 errno = EOPNOTSUPP;
983 return(NULL);
984}
985
02a705ad 986struct socket *netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
d3372da9 987{
02a705ad 988 struct ufd *nufd;
d3372da9 989
02a705ad 990 nufd = dupufd(sk->back->ufd);
5afb0d14 991 getsock(sk = nufd->sk->back);
02a705ad
FT		 992 memcpy(nufd->d.s.remote = smalloc(addrlen), addr, nufd->d.s.remotelen = addrlen);
993 nufd->ignread = 1;
994 return(sk);
d3372da9 995}
996
cab0b442 997struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
d3372da9 998{
999 struct socket *sk;
1000 int mode;
1001
1002 mode = confgetint("net", "mode");
1003 if((mode == 0) || (mode == 1))
1004 {
1005 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
1006 return(NULL);
02a705ad
FT		 1007 memcpy(sk->ufd->d.s.remote = smalloc(addrlen), addr, sk->ufd->d.s.remotelen = addrlen);
1008 sk->back->conncb = func;
1009 sk->back->data = data;
8d7a1e88
FT		 1010 getsock(sk->back);
1011 putsock(sk);
02a705ad 1012 if(!connect(sk->ufd->fd, addr, addrlen))
d3372da9 1013 {
02a705ad
FT		 1014 sksetstate(sk, SOCK_EST);
1015 linksock(&cbatch, sk->back);
1016 return(sk->back);
d3372da9 1017 }
1018 if(errno == EINPROGRESS)
1019 {
02a705ad
FT		 1020 sksetstate(sk, SOCK_SYN);
1021 return(sk->back);
d3372da9 1022 }
bceefd0d 1023 putsock(sk->back);
d3372da9 1024 return(NULL);
1025 }
1026 errno = EOPNOTSUPP;
1027 return(NULL);
1028}
1029
02a705ad 1030static void acceptunix(struct ufd *ufd)
9e5f2b29 1031{
1032 int buf;
1033
1034 buf = 1;
a8c5ada6 1035#if UNIX_AUTH_STYLE == 1
02a705ad
FT		 1036 if(setsockopt(ufd->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
1037 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", ufd->fd, strerror(errno));
a8c5ada6 1038#elif UNIX_AUTH_STYLE == 2
02a705ad 1039 if(getpeereid(ufd->fd, &ufd->d.s.ucred.uid, &ufd->d.s.ucred.gid) < 0)
a8c5ada6 1040 {
02a705ad
FT		 1041 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", ufd->fd, strerror(errno));
1042 ufd->d.s.ucred.uid = -1;
1043 ufd->d.s.ucred.gid = -1;
a8c5ada6 1044 }
1045#endif
9e5f2b29 1046}
1047
f96d0914
FT		 1048static void runbatches(void)
1049{
1050 struct scons *sc, *nsc;
1051
1052 for(sc = cbatch, cbatch = NULL; sc; sc = nsc) {
1053 nsc = sc->n;
5afb0d14
FT		 1054 if(sc->s->conncb != NULL)
1055 sc->s->conncb(sc->s, 0, sc->s->data);
834b0aa6 1056 putsock(sc->s);
f96d0914
FT		 1057 free(sc);
1058 }
1059 for(sc = rbatch, rbatch = NULL; sc; sc = nsc) {
1060 nsc = sc->n;
5afb0d14
FT		 1061 if(sc->s->readcb != NULL)
1062 sc->s->readcb(sc->s, sc->s->data);
1063 if((sockgetdatalen(sc->s) == 0) && (sc->s->eos == 1)) {
1064 if(sc->s->errcb != NULL)
1065 sc->s->errcb(sc->s, 0, sc->s->data);
1066 sc->s->eos = 2;
1067 }
834b0aa6 1068 putsock(sc->s);
f96d0914
FT		 1069 free(sc);
1070 }
1071 for(sc = wbatch, wbatch = NULL; sc; sc = nsc) {
1072 nsc = sc->n;
5afb0d14
FT		 1073 if(sc->s->writecb != NULL)
1074 sc->s->writecb(sc->s, sc->s->data);
834b0aa6 1075 putsock(sc->s);
f96d0914
FT		 1076 free(sc);
1077 }
1078}
1079
5afb0d14
FT		 1080static void cleansocks(void)
1081{
1082 struct ufd *ufd, *next;
8d7a1e88 1083 int dead;
5afb0d14
FT		 1084
1085 for(ufd = ufds; ufd != NULL; ufd = next) {
1086 next = ufd->next;
8d7a1e88
FT		 1087 if(ufd->sk) {
1088 dead = (ufd->fd < 0);
1089 if(ufd->sk->state == SOCK_STL)
1090 dead = 1;
1091 if((ufd->sk->state == SOCK_EST) && (sockgetdatalen(ufd->sk) == 0))
1092 dead = 1;
1093 if(!dead)
1094 continue;
5afb0d14
FT		 1095 if(ufd->sk->eos == 1) {
1096 ufd->sk->eos = 2;
1097 closeufd(ufd);
1098 closesock(ufd->sk);
1099 }
1100 if((ufd->sk->refcount == 1) && (ufd->sk->back->refcount == 0)) {
1101 freeufd(ufd);
1102 continue;
1103 }
1104 }
1105 }
1106}
1107
d3372da9 1108int pollsocks(int timeout)
1109{
02a705ad 1110 int ret;
eaa35963 1111 socklen_t retlen;
72a7835e
FT		 1112 int newfd, maxfd;
1113 fd_set rfds, wfds, efds;
5afb0d14 1114 struct ufd *ufd, *nufd;
02a705ad 1115 struct socket *nsk;
d3372da9 1116 struct sockaddr_storage ss;
1117 socklen_t sslen;
72a7835e 1118 struct timeval tv;
d3372da9 1119
5afb0d14 1120 cleansocks();
72a7835e
FT		 1121 FD_ZERO(&rfds);
1122 FD_ZERO(&wfds);
1123 FD_ZERO(&efds);
02a705ad
FT		 1124 for(maxfd = 0, ufd = ufds; ufd != NULL; ufd = ufd->next) {
1125 if(ufd->fd < 0)
d3372da9 1126 continue;
81286a22 1127 if(!ufd->ignread && ((ufd->sk == NULL) || (sockqueueleft(ufd->sk) > 0)))
02a705ad
FT		 1128 FD_SET(ufd->fd, &rfds);
1129 if(ufd->sk != NULL) {
1130 if(sockgetdatalen(ufd->sk) > 0)
1131 FD_SET(ufd->fd, &wfds);
1132 else if(ufd->sk->state == SOCK_SYN)
1133 FD_SET(ufd->fd, &wfds);
1134 }
1135 FD_SET(ufd->fd, &efds);
1136 if(ufd->fd > maxfd)
1137 maxfd = ufd->fd;
d3372da9 1138 }
5afb0d14
FT		 1139 if(rbatch || wbatch || cbatch)
1140 timeout = 0;
72a7835e
FT		 1141 tv.tv_sec = timeout / 1000;
1142 tv.tv_usec = (timeout % 1000) * 1000;
1143 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
02a705ad
FT		 1144 if(ret < 0) {
1145 if(errno != EINTR) {
72a7835e 1146 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
d3372da9 1147 /* To avoid CPU hogging in case it's bad, which it
1148 * probably is. */
1149 sleep(1);
1150 }
d3372da9 1151 return(1);
1152 }
5afb0d14 1153 for(ufd = ufds; ufd != NULL; ufd = ufd->next) {
02a705ad
FT		 1154 if(ufd->sk < 0)
1155 continue;
1156 if(ufd->type == UFD_LISTEN) {
1157 if(FD_ISSET(ufd->fd, &rfds)) {
d3372da9 1158 sslen = sizeof(ss);
02a705ad
FT		 1159 if((newfd = accept(ufd->fd, (struct sockaddr *)&ss, &sslen)) < 0) {
1160 if(ufd->d.l.lp->errcb != NULL)
1161 ufd->d.l.lp->errcb(ufd->d.l.lp, errno, ufd->d.l.lp->data);
cab0b442 1162 }
02a705ad
FT		 1163 nsk = sockpair(0);
1164 nufd = mkufd(newfd, UFD_SOCK, nsk);
1165 nufd->d.s.family = ufd->d.l.family;
1166 sksetstate(nsk, SOCK_EST);
1167 memcpy(nufd->d.s.remote = smalloc(sslen), &ss, sslen);
1168 nufd->d.s.remotelen = sslen;
9e5f2b29 1169 if(ss.ss_family == PF_UNIX)
02a705ad
FT		 1170 acceptunix(nufd);
1171 if(ufd->d.l.lp->acceptcb != NULL)
5afb0d14 1172 ufd->d.l.lp->acceptcb(ufd->d.l.lp, nsk->back, ufd->d.l.lp->data);
02a705ad 1173 putsock(nsk);
d3372da9 1174 }
02a705ad 1175 if(FD_ISSET(ufd->fd, &efds)) {
d3372da9 1176 retlen = sizeof(ret);
02a705ad
FT		 1177 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1178 if(ufd->d.l.lp->errcb != NULL)
1179 ufd->d.l.lp->errcb(ufd->d.l.lp, ret, ufd->d.l.lp->data);
d3372da9 1180 continue;
1181 }
02a705ad
FT		 1182 } else {
1183 if(ufd->sk->state == SOCK_SYN) {
1184 if(FD_ISSET(ufd->fd, &efds)) {
1185 retlen = sizeof(ret);
1186 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1187 if(ufd->sk->back->conncb != NULL)
1188 ufd->sk->back->conncb(ufd->sk->back, ret, ufd->sk->back->data);
1189 closeufd(ufd);
1190 continue;
1191 }
1192 if(FD_ISSET(ufd->fd, &rfds) || FD_ISSET(ufd->fd, &wfds)) {
1193 sksetstate(ufd->sk, SOCK_EST);
1194 linksock(&cbatch, ufd->sk->back);
1195 }
1196 } else if(ufd->sk->state == SOCK_EST) {
1197 if(FD_ISSET(ufd->fd, &efds)) {
1198 retlen = sizeof(ret);
1199 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1200 sockerror(ufd->sk, ret);
1201 closeufd(ufd);
1202 continue;
1203 }
1204 if(FD_ISSET(ufd->fd, &rfds))
1205 sockrecv(ufd);
5afb0d14
FT		 1206 if(ufd->fd == -1)
1207 continue;
89d650f1
FT		 1208 if(FD_ISSET(ufd->fd, &wfds)) {
1209 if(sockflush(ufd)) {
1210 sockerror(ufd->sk, errno);
1211 closeufd(ufd);
1212 continue;
1213 }
1214 }
d3372da9 1215 }
d3372da9 1216 }
d3372da9 1217 }
f96d0914 1218 runbatches();
5afb0d14 1219 cleansocks();
d3372da9 1220 return(1);
1221}
1222
f96d0914
FT		 1223static struct ufd *getskufd(struct socket *sk)
1224{
1225 while(1) {
1226 if(sk->back->ufd != NULL)
1227 return(sk->back->ufd);
1228 if((sk = sk->back->pnext) == NULL)
1229 break;
1230 }
1231 return(NULL);
1232}
1233
d3372da9 1234int socksettos(struct socket *sk, int tos)
1235{
b020fb3d 1236 int buf;
f96d0914 1237 struct ufd *ufd;
f966ec56 1238 int dscp2tos;
b020fb3d 1239
f96d0914
FT		 1240 ufd = getskufd(sk);
1241 if(ufd->type != UFD_SOCK) {
1242 errno = EOPNOTSUPP;
1243 return(-1);
1244 }
1245 if(ufd->d.s.family == AF_UNIX)
7ab36fbd 1246 return(0); /* Unix sockets are always perfect. :) */
f96d0914 1247 if(ufd->d.s.family == AF_INET)
d3372da9 1248 {
f966ec56 1249 dscp2tos = confgetint("net", "dscp-tos");
b020fb3d 1250 switch(tos)
1251 {
b198bed6 1252 case 0:
1253 buf = 0;
1254 break;
b020fb3d 1255 case SOCK_TOS_MINCOST:
f966ec56
FT		 1256 if(dscp2tos)
1257 buf = confgetint("net", "diffserv-mincost") << 2;
1258 else
1259 buf = 0x02;
b020fb3d 1260 break;
1261 case SOCK_TOS_MAXREL:
f966ec56
FT		 1262 if(dscp2tos)
1263 buf = confgetint("net", "diffserv-maxrel") << 2;
1264 else
1265 buf = 0x04;
b020fb3d 1266 break;
1267 case SOCK_TOS_MAXTP:
f966ec56
FT		 1268 if(dscp2tos)
1269 buf = confgetint("net", "diffserv-maxtp") << 2;
1270 else
1271 buf = 0x08;
b020fb3d 1272 break;
1273 case SOCK_TOS_MINDELAY:
f966ec56
FT		 1274 if(dscp2tos)
1275 buf = confgetint("net", "diffserv-mindelay") << 2;
1276 else
1277 buf = 0x10;
b020fb3d 1278 break;
1279 default:
1280 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1281 return(-1);
1282 }
f96d0914 1283 if(setsockopt(ufd->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
d3372da9 1284 {
1285 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1286 return(-1);
1287 }
1288 return(0);
1289 }
f96d0914 1290 if(ufd->d.s.family == AF_INET6)
b020fb3d 1291 {
1292 switch(tos)
1293 {
b198bed6 1294 case 0:
1295 buf = 0;
b020fb3d 1296 case SOCK_TOS_MINCOST:
1297 buf = confgetint("net", "diffserv-mincost");
1298 break;
1299 case SOCK_TOS_MAXREL:
1300 buf = confgetint("net", "diffserv-maxrel");
1301 break;
1302 case SOCK_TOS_MAXTP:
1303 buf = confgetint("net", "diffserv-maxtp");
1304 break;
1305 case SOCK_TOS_MINDELAY:
1306 buf = confgetint("net", "diffserv-mindelay");
1307 break;
1308 default:
1309 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1310 return(-1);
1311 }
1312 /*
1313 On Linux, the API IPv6 flow label management doesn't seem to
1314 be entirely complete, so I guess this will have to wait.
1315
1316 if(setsockopt(...) < 0)
1317 {
1318 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1319 return(-1);
1320 }
1321 */
1322 return(0);
1323 }
f96d0914 1324 flog(LOG_WARNING, "could not set TOS on sock of family %i", ufd->d.s.family);
d3372da9 1325 return(1);
1326}
1327
1328struct resolvedata
1329{
1330 int fd;
1331 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1332 void *data;
1333 struct sockaddr_storage addr;
1334 int addrlen;
1335};
1336
1337static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1338{
1339 static char buf[80];
1340 int ret;
1341 struct sockaddr_in *ipv4;
1342
1343 if(!status)
1344 {
1345 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1346 {
b4d16e90 1347 errno = ENOENT;
d3372da9 1348 data->callback(NULL, 0, data->data);
1349 } else {
1350 ipv4 = (struct sockaddr_in *)&data->addr;
1351 memcpy(&ipv4->sin_addr, buf, 4);
1352 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1353 }
1354 } else {
b4d16e90 1355 errno = ENOENT;
d3372da9 1356 data->callback(NULL, 0, data->data);
1357 }
1358 close(data->fd);
1359 free(data);
1360}
1361
1362int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1363{
1364 int i;
1365 char *p;
1366 int port;
1367 int pfd[2];
1368 pid_t child;
1369 struct resolvedata *rdata;
1370 struct sockaddr_in ipv4;
1371 struct hostent *he;
1372 sigset_t sigset;
1373
1374 /* IPv4 */
1375 port = -1;
1376 if((p = strchr(addr, ':')) != NULL)
1377 {
1378 *p = 0;
1379 port = atoi(p + 1);
1380 }
1381 ipv4.sin_family = AF_INET;
1382 ipv4.sin_port = htons(port);
1383 if(inet_aton(addr, &ipv4.sin_addr))
1384 {
1385 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1386 } else {
1387 sigemptyset(&sigset);
1388 sigaddset(&sigset, SIGCHLD);
1389 sigprocmask(SIG_BLOCK, &sigset, NULL);
1390 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1391 {
1392 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1393 return(-1);
1394 }
1395 if(child == 0)
1396 {
1397 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1398 for(i = 3; i < FD_SETSIZE; i++)
1399 {
1400 if(i != pfd[1])
1401 close(i);
1402 }
1403 signal(SIGALRM, SIG_DFL);
1404 alarm(30);
1405 if((he = gethostbyname(addr)) == NULL)
1406 exit(1);
1407 write(pfd[1], he->h_addr_list[0], 4);
1408 exit(0);
1409 } else {
1410 close(pfd[1]);
1411 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1412 rdata = smalloc(sizeof(*rdata));
1413 rdata->fd = pfd[0];
1414 rdata->callback = callback;
1415 rdata->data = data;
1416 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1417 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1418 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1419 return(1);
1420 }
1421 }
1422 return(0);
1423}
1424
f96d0914 1425static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
d3372da9 1426{
1427 socklen_t len;
1428 struct sockaddr_storage name;
1429
1430 *namebuf = NULL;
f96d0914 1431 if(fd < 0)
d3372da9 1432 return(-1);
1433 len = sizeof(name);
f96d0914 1434 if(getsockname(fd, (struct sockaddr *)&name, &len) < 0)
d3372da9 1435 {
6fb0c6ac 1436 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
d3372da9 1437 return(-1);
1438 }
1439 *namebuf = memcpy(smalloc(len), &name, len);
b870805e 1440 if(lenbuf != NULL)
1441 *lenbuf = len;
d3372da9 1442 return(0);
1443}
1444
f96d0914
FT		 1445int lstgetlocalname(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1446{
1447 struct ufd *ufd;
1448
1449 ufd = lp->ufd;
1450 return(getlocalname(ufd->fd, namebuf, lenbuf));
1451}
1452
1453int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1454{
1455 struct ufd *ufd;
1456
1457 ufd = getskufd(sk);
1458 if(ufd->type != UFD_SOCK) {
1459 errno = EOPNOTSUPP;
1460 return(-1);
1461 }
1462 return(getlocalname(ufd->fd, namebuf, lenbuf));
1463}
1464
eaa35963 1465static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1466{
1467 if(dst->sa_family != src->sa_family)
1468 {
1469 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1470 return;
1471 }
1472 switch(src->sa_family)
1473 {
1474 case AF_INET:
1475 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1476 break;
1477 case AF_INET6:
1478 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1479 break;
1480 default:
1481 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1482 break;
1483 }
1484}
1485
1486static int makepublic(struct sockaddr *addr)
d3372da9 1487{
6fb0c6ac 1488 int ret;
eaa35963 1489 socklen_t plen;
1490 struct sockaddr *pname;
1491
1492 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1493 {
1494 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1495 return(-1);
1496 }
1497 if(ret)
1498 return(0);
1499 sethostaddr(addr, pname);
1500 free(pname);
1501 return(0);
1502}
1503
f96d0914 1504static int getremotename(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
eaa35963 1505{
d3372da9 1506 socklen_t len;
6fb0c6ac 1507 struct sockaddr *name;
f96d0914
FT		 1508
1509 switch(confgetint("net", "mode")) {
d3372da9 1510 case 0:
1511 *namebuf = NULL;
f96d0914 1512 if(!getlocalname(fd, &name, &len)) {
6fb0c6ac 1513 *namebuf = name;
1514 *lenbuf = len;
eaa35963 1515 makepublic(name);
6fb0c6ac 1516 return(0);
1517 }
1518 flog(LOG_ERR, "could not get remotely accessible name by any means");
1519 return(-1);
d3372da9 1520 case 1:
1521 errno = EOPNOTSUPP;
1522 return(-1);
1523 default:
1524 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1525 errno = EOPNOTSUPP;
1526 return(-1);
1527 }
1528}
1529
f96d0914
FT		 1530int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1531{
1532 struct ufd *ufd;
1533
1534 ufd = getskufd(sk);
1535 if(ufd->type != UFD_SOCK) {
1536 errno = EOPNOTSUPP;
1537 return(-1);
1538 }
1539 if(ufd->fd < 0) {
1540 errno = EBADF;
1541 return(-1);
1542 }
1543 return(getremotename(ufd->fd, namebuf, lenbuf));
1544}
1545
1546int lstgetremotename(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1547{
1548 struct ufd *ufd;
1549
1550 ufd = lp->ufd;
1551 return(getremotename(ufd->fd, namebuf, lenbuf));
1552}
1553
d29853b1 1554int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1555{
1556 struct sockaddr *name1, *name2;
1557 socklen_t len1, len2;
f96d0914
FT		 1558 struct ufd *ufd1, *ufd2;
1559
1560 ufd1 = getskufd(sk);
1561 ufd2 = getskufd(sk2);
1562 if((ufd1->type != UFD_SOCK) || (ufd2->type != UFD_SOCK)) {
1563 errno = EOPNOTSUPP;
1564 return(-1);
1565 }
1566 if(ufd1->d.s.family != ufd2->d.s.family)
1567 {
1568 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1569 return(-1);
1570 }
1571 if(getremotename(ufd1->fd, &name1, &len1))
1572 return(-1);
1573 if(getremotename(ufd2->fd, &name2, &len2)) {
1574 free(name1);
1575 return(-1);
1576 }
1577 sethostaddr(name1, name2);
1578 free(name2);
1579 *namebuf = name1;
1580 *lenbuf = len1;
1581 return(0);
1582}
1583
1584int lstgetremotename2(struct lport *lp, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1585{
1586 struct sockaddr *name1, *name2;
1587 socklen_t len1, len2;
1588 struct ufd *ufd1, *ufd2;
d29853b1 1589
f96d0914
FT		 1590 ufd1 = lp->ufd;
1591 ufd2 = getskufd(sk2);
1592 if(ufd2->type != UFD_SOCK) {
1593 errno = EOPNOTSUPP;
1594 return(-1);
1595 }
d334fbb5 1596 if(ufd1->d.l.family != ufd2->d.s.family)
d29853b1 1597 {
d334fbb5 1598 flog(LOG_ERR, "using lstgetremotename2 with sockets of differing family: %i %i", ufd1->d.l.family, ufd2->d.s.family);
d29853b1 1599 return(-1);
1600 }
f96d0914 1601 if(getremotename(ufd1->fd, &name1, &len1))
d29853b1 1602 return(-1);
f96d0914 1603 if(getremotename(ufd2->fd, &name2, &len2)) {
d29853b1 1604 free(name1);
1605 return(-1);
1606 }
1607 sethostaddr(name1, name2);
1608 free(name2);
1609 *namebuf = name1;
1610 *lenbuf = len1;
1611 return(0);
1612}
1613
f96d0914
FT		 1614int getucred(struct socket *sk, uid_t *uid, gid_t *gid)
1615{
1616 struct ufd *ufd;
1617
1618 ufd = getskufd(sk);
1619 if(ufd->type != UFD_SOCK) {
1620 errno = EOPNOTSUPP;
1621 return(-1);
1622 }
1623 if(ufd->d.s.family != AF_UNIX) {
1624 errno = EOPNOTSUPP;
1625 return(-1);
1626 }
1627 *uid = ufd->d.s.ucred.uid;
1628 *gid = ufd->d.s.ucred.gid;
1629 return(0);
1630}
1631
81286a22
FT		 1632/* void sockblock(struct socket *sk, int block) */
1633/* { */
1634/* struct ufd *ufd; */
f96d0914 1635
81286a22
FT		 1636/* ufd = getskufd(sk); */
1637/* ufd->ignread = block; */
1638/* } */
f96d0914
FT		 1639
1640int sockfamily(struct socket *sk)
1641{
1642 struct ufd *ufd;
1643
1644 ufd = getskufd(sk);
1645 if(ufd->type != UFD_SOCK) {
1646 errno = EOPNOTSUPP;
1647 return(-1);
1648 }
1649 return(ufd->d.s.family);
02a705ad
FT		 1650}
1651
1652int sockpeeraddr(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1653{
f96d0914
FT		 1654 struct ufd *ufd;
1655
1656 ufd = getskufd(sk);
1657 if(ufd->type != UFD_SOCK) {
1658 errno = EOPNOTSUPP;
1659 return(-1);
1660 }
1661 if(ufd->d.s.remote == NULL)
1662 return(-1);
1663 *namebuf = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, ufd->d.s.remotelen);
1664 if(lenbuf != NULL)
1665 *lenbuf = ufd->d.s.remotelen;
1666 return(0);
02a705ad
FT		 1667}
1668
1669char *formatsockpeer(struct socket *sk)
1670{
1671 struct sockaddr *name;
1672 socklen_t nlen;
1673 char *ret;
1674
1675 if(sockpeeraddr(sk, &name, &nlen))
1676 return(NULL);
1677 ret = formataddress(name, nlen);
1678 free(name);
1679 return(ret);
1680}
1681
99a28d47 1682int addreq(struct sockaddr *x, struct sockaddr *y)
1683{
1684 struct sockaddr_un *u1, *u2;
1685 struct sockaddr_in *n1, *n2;
1686#ifdef HAVE_IPV6
1687 struct sockaddr_in6 *s1, *s2;
1688#endif
1689
1690 if(x->sa_family != y->sa_family)
1691 return(0);
1692 switch(x->sa_family) {
1693 case AF_UNIX:
1694 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1695 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1696 return(0);
1697 break;
1698 case AF_INET:
1699 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1700 if(n1->sin_port != n2->sin_port)
1701 return(0);
1702 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1703 return(0);
1704 break;
c8a729d7 1705#ifdef HAVE_IPV6
99a28d47 1706 case AF_INET6:
1707 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1708 if(s1->sin6_port != s2->sin6_port)
1709 return(0);
1710 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1711 return(0);
1712 break;
c8a729d7 1713#endif
99a28d47 1714 }
1715 return(1);
1716}
1717
d3372da9 1718char *formataddress(struct sockaddr *arg, socklen_t arglen)
1719{
d3372da9 1720 struct sockaddr_in *ipv4;
1721#ifdef HAVE_IPV6
1722 struct sockaddr_in6 *ipv6;
1723#endif
1724 static char *ret = NULL;
1725 char buf[1024];
1726
1727 if(ret != NULL)
1728 free(ret);
1729 ret = NULL;
1730 switch(arg->sa_family)
1731 {
1732 case AF_UNIX:
6a97462e 1733 ret = sstrdup("Unix socket");
d3372da9 1734 break;
1735 case AF_INET:
1736 ipv4 = (struct sockaddr_in *)arg;
1737 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1738 return(NULL);
1739 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1740 break;
1741#ifdef HAVE_IPV6
1742 case AF_INET6:
1743 ipv6 = (struct sockaddr_in6 *)arg;
1744 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1745 return(NULL);
fc7f7735 1746 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
d3372da9 1747 break;
1748#endif
1749 default:
1750 errno = EPFNOSUPPORT;
1751 break;
1752 }
1753 return(ret);
1754}
1755
1756#if 0
1757
1758/*
1759 * It was very nice to use this, but it seems
1760 * to mess things up, so I guess it has to go... :-(
1761 */
1762
1763static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1764{
1765 struct sockaddr *arg;
1766 socklen_t arglen;
1767 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1768 * lowercase letters to 1, so I do this
1769 * instead. */
1770 struct sockaddr_in *ipv4;
1771 int ret;
1772
1773 arg = *(struct sockaddr **)(args[0]);
1774 arglen = *(socklen_t *)(args[1]);
1775 switch(arg->sa_family)
1776 {
1777 case AF_UNIX:
1778 UNIX = (struct sockaddr_un *)arg;
1779 ret = fprintf(stream, "%s", UNIX->sun_path);
1780 break;
1781 case AF_INET:
1782 ipv4 = (struct sockaddr_in *)arg;
1783 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1784 break;
1785 default:
1786 ret = -1;
1787 errno = EPFNOSUPPORT;
1788 break;
1789 }
1790 return(ret);
1791}
1792
1793static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1794{
1795 if(n > 0)
1796 argtypes[0] = PA_POINTER;
1797 if(n > 1)
1798 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1799 * be an int, so I guess this should be
1800 * safe. */
1801 return(2);
1802}
1803#endif
1804
1805static int init(int hup)
1806{
1807 if(!hup)
1808 {
1809 /*
1810 if(register_printf_function('N', formataddress, formataddress_arginfo))
1811 {
1812 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1813 return(1);
1814 }
1815 */
1816 }
1817 return(0);
1818}
1819
1820static void terminate(void)
1821{
f96d0914
FT		 1822 /*
1823 while(ufds != NULL)
1824 freeufd(ufds);
1825 */
d3372da9 1826}
1827
1828static struct module me =
1829{
1830 .name = "net",
1831 .conf =
1832 {
1833 .vars = myvars
1834 },
1835 .init = init,
1836 .terminate = terminate
1837};
1838
1839MODULE(me)
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