2 * Dolda Connect - Modular multiuser Direct Connect-style client
3 * Copyright (C) 2004 Fredrik Tolf <fredrik@dolda2000.com>
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.
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.
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
19 /* XXX: Implement SOCKS proxyability */
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
31 #include <sys/select.h>
32 #include <arpa/inet.h>
33 #include <netinet/in.h>
35 #include <sys/signal.h>
36 #include <sys/stat.h> /* For rebindunix() */
37 #ifdef HAVE_LINUX_SOCKIOS_H
38 #include <linux/sockios.h>
48 #include "sysevents.h"
50 static struct configvar myvars[] =
52 /** The network mode to use. Currently supported values are 0 for
53 * active mode and 1 for passive mode. In the future, SOCKS5 proxy
54 * support may be added. */
55 {CONF_VAR_INT, "mode", {.num = 0}},
56 /** Set the SO_REUSEADDR socket option on listening sockets, so
57 * that dead TCP connections waiting for timeout are ignored. */
58 {CONF_VAR_BOOL, "reuseaddr", {.num = 0}},
59 /** Overrides the IPv4 address reported to other clients in active
60 * mode. Useful for servers behind NAT routers. If both this and
61 * net.publicif are unspecified the address of the hub connection
63 {CONF_VAR_IPV4, "visibleipv4", {.ipv4 = {0}}},
64 /** Specifies an interface name from which to fetch the IPv4
65 * address reported to other clients in active mode. If both this
66 * and net.visibleipv4 are unspecified the address of the hub
67 * connection is used. */
68 {CONF_VAR_STRING, "publicif", {.str = L""}},
69 /** The Diffserv value to use on IPv6 connections when the
70 * minimize cost TOS value is used (see the TOS VALUES
72 {CONF_VAR_INT, "diffserv-mincost", {.num = 0}},
73 /** The Diffserv value to use on IPv6 connections when the
74 * maximize reliability TOS value is used (see the TOS VALUES
76 {CONF_VAR_INT, "diffserv-maxrel", {.num = 0}},
77 /** The Diffserv value to use on IPv6 connections when the
78 * maximize throughput TOS value is used (see the TOS VALUES
80 {CONF_VAR_INT, "diffserv-maxtp", {.num = 0}},
81 /** The Diffserv value to use on IPv6 connections when the
82 * minimize delay TOS value is used (see the TOS VALUES
84 {CONF_VAR_INT, "diffserv-mindelay", {.num = 0}},
85 /** If enabled, the IP TOS interface will be used to set Diffserv
86 * codepoints on IPv4 sockets, by shifting the DSCP value two bits
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. */
90 {CONF_VAR_BOOL, "dscp-tos", {.num = 0}},
104 struct ufd *next, *prev;
113 struct sockaddr *remote;
127 static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf);
129 static struct ufd *ufds = NULL;
130 static struct scons *rbatch, *wbatch, *cbatch;
133 /* XXX: Get autoconf for all this... */
134 int getpublicaddr(int af, struct sockaddr **addr, socklen_t *lenbuf)
136 struct sockaddr_in *ipv4;
137 struct configvar *var;
141 struct ifreq *ifr, req;
146 var = confgetvar("net", "visibleipv4");
147 if(var->val.ipv4.s_addr != 0)
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);
156 if((pif = icswcstombs(confgetstr("net", "publicif"), NULL, NULL)) == NULL)
158 flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno));
163 if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
165 conf.ifc_buf = smalloc(conf.ifc_len = 65536);
166 if(ioctl(sock, SIOCGIFCONF, &conf) < 0)
172 bufend = ((char *)conf.ifc_buf) + conf.ifc_len;
174 for(ifr = conf.ifc_ifcu.ifcu_req; (void *)ifr < bufend; ifr++)
176 if(strcmp(ifr->ifr_name, pif))
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)
182 if(!(req.ifr_flags & IFF_UP))
184 flog(LOG_WARNING, "public interface is down");
187 if(ifr->ifr_addr.sa_family != AF_INET)
189 flog(LOG_WARNING, "address of the public interface is not AF_INET");
192 ipv4 = smalloc(sizeof(*ipv4));
193 memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr));
200 *addr = (struct sockaddr *)ipv4;
201 *lenbuf = sizeof(*ipv4);
210 static struct socket *newsock1(int dgram)
214 new = memset(smalloc(sizeof(*new)), 0, sizeof(*new));
223 static struct socket *sockpair(int dgram)
225 struct socket *s1, *s2;
227 s1 = newsock1(dgram);
228 s2 = newsock1(dgram);
235 static void sksetstate(struct socket *sk, int state)
238 sk->back->state = state;
241 static void closeufd(struct ufd *ufd)
248 static void freeufd(struct ufd *ufd)
250 if(ufd->next != NULL)
251 ufd->next->prev = ufd->prev;
252 if(ufd->prev != NULL)
253 ufd->prev->next = ufd->next;
259 if(ufd->type == UFD_SOCK) {
260 if(ufd->d.s.remote != NULL)
261 free(ufd->d.s.remote);
266 static struct ufd *mkufd(int fd, int type, struct socket *sk)
270 ufd = memset(smalloc(sizeof(*ufd)), 0, sizeof(*ufd));
274 getsock(ufd->sk = sk);
277 if(type == UFD_SOCK) {
278 ufd->d.s.ucred.uid = -1;
279 ufd->d.s.ucred.gid = -1;
288 static struct ufd *dupufd(struct ufd *ufd)
294 nsk = sockpair(ufd->sk->dgram);
297 nufd = mkufd(ufd->fd, ufd->type, nsk);
300 if((nufd->fd = dup(ufd->fd)) < 0)
302 flog(LOG_WARNING, "could not dup() fd: %s", strerror(errno));
306 sksetstate(nsk, SOCK_EST);
307 if(ufd->type == UFD_SOCK) {
308 nufd->d.s.family = ufd->d.s.family;
309 nufd->d.s.type = ufd->d.s.type;
310 nufd->d.s.ucred.uid = ufd->d.s.ucred.uid;
311 nufd->d.s.ucred.gid = ufd->d.s.ucred.gid;
312 if(ufd->d.s.remote != NULL)
313 nufd->d.s.remote = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, nufd->d.s.remotelen = ufd->d.s.remotelen);
314 } else if(ufd->type == UFD_LISTEN) {
315 nufd->d.l.family = ufd->d.l.family;
320 static struct socket *mksock(int domain, int type)
326 if((fd = socket(domain, type, 0)) < 0)
328 flog(LOG_CRIT, "could not create socket: %s", strerror(errno));
331 sk = sockpair(type == SOCK_DGRAM);
332 ufd = mkufd(fd, UFD_SOCK, sk);
333 ufd->d.s.family = domain;
334 ufd->d.s.type = type;
335 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
339 struct socket *wrapsock(int fd)
345 ufd = mkufd(fd, UFD_PIPE, sk->back);
346 sksetstate(sk, SOCK_EST);
347 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
351 void getsock(struct socket *sk)
356 static void freesock(struct socket *sk)
358 struct dgrambuf *buf;
361 while((buf = sk->buf.d.f) != NULL) {
362 sk->buf.d.f = buf->next;
366 if(sk->buf.s.buf != NULL)
373 void putsock(struct socket *sk)
377 if(--(sk->refcount) < 0) {
378 flog(LOG_CRIT, "BUG: socket refcount < 0");
381 if((sk->refcount == 0) && (sk->back->refcount == 0)) {
388 static void linksock(struct scons **list, struct socket *sk)
392 for(sc = *list; sc != NULL; sc = sc->n) {
396 sc = smalloc(sizeof(*sc));
405 void sockpushdata(struct socket *sk, void *buf, size_t size)
412 sizebuf(&sk->buf.s.buf, &sk->buf.s.bufsize, sk->buf.s.datasize + size, 1, 1);
413 memmove(sk->buf.s.buf + size, sk->buf.s.buf, sk->buf.s.datasize);
414 memcpy(sk->buf.s.buf, buf, size);
415 sk->buf.s.datasize += size;
416 linksock(&rbatch, sk);
420 /* Read as the preterite of `read' */
421 void sockread(struct socket *sk)
423 if((sockgetdatalen(sk) == 0) && (sk->eos == 1))
424 linksock(&rbatch, sk);
425 linksock(&wbatch, sk->back);
428 void freedgbuf(struct dgrambuf *dg)
437 struct dgrambuf *sockgetdgbuf(struct socket *sk)
439 struct dgrambuf *dbuf;
441 if((dbuf = sk->buf.d.f) == NULL)
443 sk->buf.d.f = dbuf->next;
444 if(dbuf->next == NULL)
451 void *sockgetinbuf(struct socket *sk, size_t *size)
454 struct dgrambuf *dbuf;
457 dbuf = sockgetdgbuf(sk);
463 if((sk->buf.s.buf == NULL) || (sk->buf.s.datasize == 0))
469 *size = sk->buf.s.datasize;
470 sk->buf.s.buf = NULL;
471 sk->buf.s.bufsize = sk->buf.s.datasize = 0;
477 void sockqueue(struct socket *sk, void *data, size_t size)
479 struct dgrambuf *new;
480 struct sockaddr *remote;
485 if(sk->state == SOCK_STL)
488 if(sockpeeraddr(sk, &remote, &remotelen))
490 new = smalloc(sizeof(*new));
492 memcpy(new->data = smalloc(size), data, new->size = size);
494 new->addrlen = remotelen;
495 if(sk->back->buf.d.l == NULL)
497 sk->back->buf.d.l = sk->back->buf.d.f = new;
499 sk->back->buf.d.l->next = new;
500 sk->back->buf.d.l = new;
503 sizebuf(&(sk->back->buf.s.buf), &(sk->back->buf.s.bufsize), sk->back->buf.s.datasize + size, 1, 1);
504 memcpy(sk->back->buf.s.buf + sk->back->buf.s.datasize, data, size);
505 sk->back->buf.s.datasize += size;
507 linksock(&rbatch, sk->back);
510 void sockqueuedg(struct socket *sk, struct dgrambuf *dg)
512 if(sk->state == SOCK_STL) {
517 flog(LOG_ERR, "BUG: sockqueuedg called on non-dgram socket");
522 if(sk->back->buf.d.l == NULL)
524 sk->back->buf.d.l = sk->back->buf.d.f = dg;
526 sk->back->buf.d.l->next = dg;
527 sk->back->buf.d.l = dg;
529 linksock(&rbatch, sk->back);
532 void sockerror(struct socket *sk, int en)
534 sksetstate(sk, SOCK_STL);
535 if(sk->back->errcb != NULL)
536 sk->back->errcb(sk->back, en, sk->back->data);
539 static void recvcmsg(struct ufd *ufd, struct msghdr *msg)
541 struct cmsghdr *cmsg;
543 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
545 #if UNIX_AUTH_STYLE == 1
546 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
549 if(ufd->d.s.ucred.uid == -1)
551 cred = (struct ucred *)CMSG_DATA(cmsg);
552 ufd->d.s.ucred.uid = cred->uid;
553 ufd->d.s.ucred.gid = cred->gid;
560 static int ufddgram(struct ufd *ufd)
564 if(ufd->type == UFD_SOCK) {
565 dgram = ufd->d.s.type == SOCK_DGRAM;
566 } else if(ufd->type == UFD_PIPE) {
569 flog(LOG_ERR, "BUG: calling ufddgram on ufd of bad type %i", ufd->type);
572 if(ufd->sk == NULL) {
573 flog(LOG_ERR, "BUG: calling ufddgram on socketless ufd (type %i)", ufd->type);
576 if(dgram != ufd->sk->dgram) {
577 flog(LOG_ERR, "BUG: ufd/socket dgram value mismatch");
583 static void sockrecv(struct ufd *ufd)
587 struct dgrambuf *dbuf;
593 memset(&msg, 0, sizeof(msg));
594 msg.msg_iov = &bufvec;
596 msg.msg_control = cbuf;
597 msg.msg_controllen = sizeof(cbuf);
598 if((dgram = ufddgram(ufd)) < 0)
601 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
602 if(ioctl(ufd->fd, SIOCINQ, &inq))
604 /* I don't really know what could go wrong here, so let's
605 * assume it's transient. */
606 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), ufd->fd);
612 dbuf = smalloc(sizeof(*dbuf));
613 dbuf->data = smalloc(inq);
614 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
615 msg.msg_name = dbuf->addr;
616 msg.msg_namelen = dbuf->addrlen;
617 bufvec.iov_base = dbuf->data;
618 bufvec.iov_len = inq;
619 ret = recvmsg(ufd->fd, &msg, 0);
620 dbuf->addrlen = msg.msg_namelen;
624 if((errno == EINTR) || (errno == EAGAIN))
627 sockerror(ufd->sk, errno);
630 if(msg.msg_flags & MSG_CTRUNC)
631 flog(LOG_DEBUG, "ancillary data was truncated");
634 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
635 * have EOF), but rather an empty packet. I don't know if any
636 * other potential DGRAM protocols might have an EOF
637 * condition, so let's play safe. */
641 if((ufd->type != UFD_SOCK) || !((ufd->d.s.family == AF_INET) || (ufd->d.s.family == AF_INET6)))
648 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
649 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
651 sockqueuedg(ufd->sk, dbuf);
653 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
654 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
655 * how to read the inqueue size on other OSs */
656 if(ufd->type == UFD_SOCK) {
657 if(ioctl(ufd->fd, SIOCINQ, &inq))
659 /* I don't really know what could go wrong here, so let's
660 * assume it's transient. */
661 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), ufd->fd);
665 /* There are perils when trying to use SIOCINQ on files >2GiB... */
673 /* This part could be optimized by telling the kernel to read
674 * directly into ufd->sk->back->buf, but that would be uglier
675 * by not using the socket function interface. */
677 if(ufd->type == UFD_SOCK)
679 bufvec.iov_base = buf;
680 bufvec.iov_len = inq;
681 ret = recvmsg(ufd->fd, &msg, 0);
683 ret = read(ufd->fd, buf, inq);
684 msg.msg_controllen = 0;
690 if((errno == EINTR) || (errno == EAGAIN))
693 sockerror(ufd->sk, errno);
696 if(msg.msg_flags & MSG_CTRUNC)
697 flog(LOG_DEBUG, "ancillary data was truncated");
707 sockqueue(ufd->sk, buf, ret);
712 static int sockflush(struct ufd *ufd)
715 struct dgrambuf *dbuf;
718 if((dgram = ufddgram(ufd)) < 0) {
723 dbuf = sockgetdgbuf(ufd->sk);
724 sendto(ufd->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
727 if(ufd->type == UFD_SOCK)
728 ret = send(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
730 ret = write(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize);
734 memmove(ufd->sk->buf.s.buf, ((char *)ufd->sk->buf.s.buf) + ret, ufd->sk->buf.s.datasize -= ret);
741 void closesock(struct socket *sk)
743 sksetstate(sk, SOCK_STL);
744 if(sk->back->eos == 0)
746 linksock(&rbatch, sk->back);
749 size_t sockgetdatalen(struct socket *sk)
756 for(b = sk->buf.d.f; b != NULL; b = b->next)
759 ret = sk->buf.s.datasize;
764 /* size_t sockqueuesize(struct socket *sk) */
766 /* return(sockgetdatalen(sk->back)); */
769 ssize_t sockqueueleft(struct socket *sk)
771 return(sk->back->maxbuf - sockgetdatalen(sk->back));
775 * Seriously, I don't know if it's naughty or not to remove
776 * pre-existing Unix sockets.
778 static int rebindunix(struct ufd *ufd, struct sockaddr *name, socklen_t namelen)
780 struct sockaddr_un *un;
783 if((ufd->d.l.family != AF_UNIX) || (name->sa_family != PF_UNIX))
785 un = (struct sockaddr_un *)name;
786 if(stat(un->sun_path, &sb))
788 if(!S_ISSOCK(sb.st_mode))
790 if(unlink(un->sun_path))
792 if(bind(ufd->fd, name, namelen) < 0)
797 void closelport(struct lport *lp)
800 struct sockaddr_un *un;
803 if((ufd->d.l.family == AF_UNIX) && !getlocalname(ufd->fd, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX) && strchr(un->sun_path, '/')) {
804 if(unlink(un->sun_path))
805 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
811 * The difference between netcslisten() and netcslistenlocal() is that
812 * netcslistenlocal() always listens on the local host, instead of
813 * following proxy/passive mode directions. It is suitable for eg. the
814 * UI channel, while the file sharing networks should, naturally, use
815 * netcslisten() instead.
818 struct lport *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
825 /* I don't know if this is actually correct (it probably isn't),
826 * but since, at on least Linux systems, PF_* are specifically
827 * #define'd to their AF_* counterparts, it allows for a severely
828 * smoother implementation. If it breaks something on your
829 * platform, please tell me so.
831 if((fd = socket(name->sa_family, type, 0)) < 0)
833 if(confgetint("net", "reuseaddr")) {
835 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
837 ufd = mkufd(fd, UFD_LISTEN, NULL);
838 ufd->d.l.family = name->sa_family;
839 lp = memset(smalloc(sizeof(*lp)), 0, sizeof(*lp));
842 if((bind(fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(ufd, name, namelen) < 0))) {
846 if(listen(fd, 16) < 0)
856 struct lport *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
858 if(confgetint("net", "mode") == 1)
863 if(confgetint("net", "mode") == 0)
864 return(netcslistenlocal(type, name, namelen, func, data));
869 struct lport *netcstcplisten(int port, int local, void (*func)(struct lport *, struct socket *, void *), void *data)
871 struct sockaddr_in addr;
873 struct sockaddr_in6 addr6;
875 struct lport *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct lport *, struct socket *, void *), void *);
879 csfunc = netcslistenlocal;
881 csfunc = netcslisten;
883 memset(&addr6, 0, sizeof(addr6));
884 addr6.sin6_family = AF_INET6;
885 addr6.sin6_port = htons(port);
886 addr6.sin6_addr = in6addr_any;
887 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
889 if((ret == NULL) && (errno != EAFNOSUPPORT))
892 memset(&addr, 0, sizeof(addr));
893 addr.sin_family = AF_INET;
894 addr.sin_port = htons(port);
895 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
898 struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
903 mode = confgetint("net", "mode");
904 if((mode == 0) || (mode == 1))
906 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
908 if(bind(sk->ufd->fd, name, namelen) < 0)
913 sksetstate(sk, SOCK_EST);
920 struct socket *netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
924 nufd = dupufd(sk->back->ufd);
925 getsock(sk = nufd->sk->back);
926 memcpy(nufd->d.s.remote = smalloc(addrlen), addr, nufd->d.s.remotelen = addrlen);
931 struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
936 mode = confgetint("net", "mode");
937 if((mode == 0) || (mode == 1))
939 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
941 memcpy(sk->ufd->d.s.remote = smalloc(addrlen), addr, sk->ufd->d.s.remotelen = addrlen);
942 sk->back->conncb = func;
943 sk->back->data = data;
944 if(!connect(sk->ufd->fd, addr, addrlen))
946 sksetstate(sk, SOCK_EST);
947 linksock(&cbatch, sk->back);
950 if(errno == EINPROGRESS)
952 sksetstate(sk, SOCK_SYN);
962 static void acceptunix(struct ufd *ufd)
967 #if UNIX_AUTH_STYLE == 1
968 if(setsockopt(ufd->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
969 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", ufd->fd, strerror(errno));
970 #elif UNIX_AUTH_STYLE == 2
971 if(getpeereid(ufd->fd, &ufd->d.s.ucred.uid, &ufd->d.s.ucred.gid) < 0)
973 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", ufd->fd, strerror(errno));
974 ufd->d.s.ucred.uid = -1;
975 ufd->d.s.ucred.gid = -1;
980 static void runbatches(void)
982 struct scons *sc, *nsc;
984 for(sc = cbatch, cbatch = NULL; sc; sc = nsc) {
986 if(sc->s->conncb != NULL)
987 sc->s->conncb(sc->s, 0, sc->s->data);
991 for(sc = rbatch, rbatch = NULL; sc; sc = nsc) {
993 if(sc->s->readcb != NULL)
994 sc->s->readcb(sc->s, sc->s->data);
995 if((sockgetdatalen(sc->s) == 0) && (sc->s->eos == 1)) {
996 if(sc->s->errcb != NULL)
997 sc->s->errcb(sc->s, 0, sc->s->data);
1003 for(sc = wbatch, wbatch = NULL; sc; sc = nsc) {
1005 if(sc->s->writecb != NULL)
1006 sc->s->writecb(sc->s, sc->s->data);
1012 static void cleansocks(void)
1014 struct ufd *ufd, *next;
1016 for(ufd = ufds; ufd != NULL; ufd = next) {
1018 if(ufd->sk && ((ufd->fd < 0) || (sockgetdatalen(ufd->sk) == 0))) {
1019 if(ufd->sk->eos == 1) {
1024 if((ufd->sk->refcount == 1) && (ufd->sk->back->refcount == 0)) {
1032 int pollsocks(int timeout)
1037 fd_set rfds, wfds, efds;
1038 struct ufd *ufd, *nufd;
1040 struct sockaddr_storage ss;
1048 for(maxfd = 0, ufd = ufds; ufd != NULL; ufd = ufd->next) {
1051 if(!ufd->ignread && ((ufd->sk == NULL) || (sockqueueleft(ufd->sk) > 0)))
1052 FD_SET(ufd->fd, &rfds);
1053 if(ufd->sk != NULL) {
1054 if(sockgetdatalen(ufd->sk) > 0)
1055 FD_SET(ufd->fd, &wfds);
1056 else if(ufd->sk->state == SOCK_SYN)
1057 FD_SET(ufd->fd, &wfds);
1059 FD_SET(ufd->fd, &efds);
1063 if(rbatch || wbatch || cbatch)
1065 tv.tv_sec = timeout / 1000;
1066 tv.tv_usec = (timeout % 1000) * 1000;
1067 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
1069 if(errno != EINTR) {
1070 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
1071 /* To avoid CPU hogging in case it's bad, which it
1077 for(ufd = ufds; ufd != NULL; ufd = ufd->next) {
1080 if(ufd->type == UFD_LISTEN) {
1081 if(FD_ISSET(ufd->fd, &rfds)) {
1083 if((newfd = accept(ufd->fd, (struct sockaddr *)&ss, &sslen)) < 0) {
1084 if(ufd->d.l.lp->errcb != NULL)
1085 ufd->d.l.lp->errcb(ufd->d.l.lp, errno, ufd->d.l.lp->data);
1088 nufd = mkufd(newfd, UFD_SOCK, nsk);
1089 nufd->d.s.family = ufd->d.l.family;
1090 sksetstate(nsk, SOCK_EST);
1091 memcpy(nufd->d.s.remote = smalloc(sslen), &ss, sslen);
1092 nufd->d.s.remotelen = sslen;
1093 if(ss.ss_family == PF_UNIX)
1095 if(ufd->d.l.lp->acceptcb != NULL)
1096 ufd->d.l.lp->acceptcb(ufd->d.l.lp, nsk->back, ufd->d.l.lp->data);
1099 if(FD_ISSET(ufd->fd, &efds)) {
1100 retlen = sizeof(ret);
1101 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1102 if(ufd->d.l.lp->errcb != NULL)
1103 ufd->d.l.lp->errcb(ufd->d.l.lp, ret, ufd->d.l.lp->data);
1107 if(ufd->sk->state == SOCK_SYN) {
1108 if(FD_ISSET(ufd->fd, &efds)) {
1109 retlen = sizeof(ret);
1110 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1111 if(ufd->sk->back->conncb != NULL)
1112 ufd->sk->back->conncb(ufd->sk->back, ret, ufd->sk->back->data);
1116 if(FD_ISSET(ufd->fd, &rfds) || FD_ISSET(ufd->fd, &wfds)) {
1117 sksetstate(ufd->sk, SOCK_EST);
1118 linksock(&cbatch, ufd->sk->back);
1120 } else if(ufd->sk->state == SOCK_EST) {
1121 if(FD_ISSET(ufd->fd, &efds)) {
1122 retlen = sizeof(ret);
1123 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1124 sockerror(ufd->sk, ret);
1128 if(FD_ISSET(ufd->fd, &rfds))
1132 if(FD_ISSET(ufd->fd, &wfds)) {
1133 if(sockflush(ufd)) {
1134 sockerror(ufd->sk, errno);
1147 static struct ufd *getskufd(struct socket *sk)
1150 if(sk->back->ufd != NULL)
1151 return(sk->back->ufd);
1152 if((sk = sk->back->pnext) == NULL)
1158 int socksettos(struct socket *sk, int tos)
1165 if(ufd->type != UFD_SOCK) {
1169 if(ufd->d.s.family == AF_UNIX)
1170 return(0); /* Unix sockets are always perfect. :) */
1171 if(ufd->d.s.family == AF_INET)
1173 dscp2tos = confgetint("net", "dscp-tos");
1179 case SOCK_TOS_MINCOST:
1181 buf = confgetint("net", "diffserv-mincost") << 2;
1185 case SOCK_TOS_MAXREL:
1187 buf = confgetint("net", "diffserv-maxrel") << 2;
1191 case SOCK_TOS_MAXTP:
1193 buf = confgetint("net", "diffserv-maxtp") << 2;
1197 case SOCK_TOS_MINDELAY:
1199 buf = confgetint("net", "diffserv-mindelay") << 2;
1204 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1207 if(setsockopt(ufd->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
1209 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1214 if(ufd->d.s.family == AF_INET6)
1220 case SOCK_TOS_MINCOST:
1221 buf = confgetint("net", "diffserv-mincost");
1223 case SOCK_TOS_MAXREL:
1224 buf = confgetint("net", "diffserv-maxrel");
1226 case SOCK_TOS_MAXTP:
1227 buf = confgetint("net", "diffserv-maxtp");
1229 case SOCK_TOS_MINDELAY:
1230 buf = confgetint("net", "diffserv-mindelay");
1233 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1237 On Linux, the API IPv6 flow label management doesn't seem to
1238 be entirely complete, so I guess this will have to wait.
1240 if(setsockopt(...) < 0)
1242 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1248 flog(LOG_WARNING, "could not set TOS on sock of family %i", ufd->d.s.family);
1255 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1257 struct sockaddr_storage addr;
1261 static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1263 static char buf[80];
1265 struct sockaddr_in *ipv4;
1269 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1272 data->callback(NULL, 0, data->data);
1274 ipv4 = (struct sockaddr_in *)&data->addr;
1275 memcpy(&ipv4->sin_addr, buf, 4);
1276 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1280 data->callback(NULL, 0, data->data);
1286 int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1293 struct resolvedata *rdata;
1294 struct sockaddr_in ipv4;
1300 if((p = strchr(addr, ':')) != NULL)
1305 ipv4.sin_family = AF_INET;
1306 ipv4.sin_port = htons(port);
1307 if(inet_aton(addr, &ipv4.sin_addr))
1309 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1311 sigemptyset(&sigset);
1312 sigaddset(&sigset, SIGCHLD);
1313 sigprocmask(SIG_BLOCK, &sigset, NULL);
1314 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1316 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1321 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1322 for(i = 3; i < FD_SETSIZE; i++)
1327 signal(SIGALRM, SIG_DFL);
1329 if((he = gethostbyname(addr)) == NULL)
1331 write(pfd[1], he->h_addr_list[0], 4);
1335 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1336 rdata = smalloc(sizeof(*rdata));
1338 rdata->callback = callback;
1340 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1341 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1342 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1349 static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1352 struct sockaddr_storage name;
1358 if(getsockname(fd, (struct sockaddr *)&name, &len) < 0)
1360 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
1363 *namebuf = memcpy(smalloc(len), &name, len);
1369 int lstgetlocalname(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1374 return(getlocalname(ufd->fd, namebuf, lenbuf));
1377 int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1382 if(ufd->type != UFD_SOCK) {
1386 return(getlocalname(ufd->fd, namebuf, lenbuf));
1389 static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1391 if(dst->sa_family != src->sa_family)
1393 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1396 switch(src->sa_family)
1399 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1402 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1405 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1410 static int makepublic(struct sockaddr *addr)
1414 struct sockaddr *pname;
1416 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1418 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1423 sethostaddr(addr, pname);
1428 static int getremotename(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1431 struct sockaddr *name;
1433 switch(confgetint("net", "mode")) {
1436 if(!getlocalname(fd, &name, &len)) {
1442 flog(LOG_ERR, "could not get remotely accessible name by any means");
1448 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1454 int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1459 if(ufd->type != UFD_SOCK) {
1467 return(getremotename(ufd->fd, namebuf, lenbuf));
1470 int lstgetremotename(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1475 return(getremotename(ufd->fd, namebuf, lenbuf));
1478 int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1480 struct sockaddr *name1, *name2;
1481 socklen_t len1, len2;
1482 struct ufd *ufd1, *ufd2;
1484 ufd1 = getskufd(sk);
1485 ufd2 = getskufd(sk2);
1486 if((ufd1->type != UFD_SOCK) || (ufd2->type != UFD_SOCK)) {
1490 if(ufd1->d.s.family != ufd2->d.s.family)
1492 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1495 if(getremotename(ufd1->fd, &name1, &len1))
1497 if(getremotename(ufd2->fd, &name2, &len2)) {
1501 sethostaddr(name1, name2);
1508 int lstgetremotename2(struct lport *lp, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1510 struct sockaddr *name1, *name2;
1511 socklen_t len1, len2;
1512 struct ufd *ufd1, *ufd2;
1515 ufd2 = getskufd(sk2);
1516 if(ufd2->type != UFD_SOCK) {
1520 if(ufd1->d.l.family != ufd2->d.s.family)
1522 flog(LOG_ERR, "using lstgetremotename2 with sockets of differing family: %i %i", ufd1->d.l.family, ufd2->d.s.family);
1525 if(getremotename(ufd1->fd, &name1, &len1))
1527 if(getremotename(ufd2->fd, &name2, &len2)) {
1531 sethostaddr(name1, name2);
1538 int getucred(struct socket *sk, uid_t *uid, gid_t *gid)
1543 if(ufd->type != UFD_SOCK) {
1547 if(ufd->d.s.family != AF_UNIX) {
1551 *uid = ufd->d.s.ucred.uid;
1552 *gid = ufd->d.s.ucred.gid;
1556 /* void sockblock(struct socket *sk, int block) */
1558 /* struct ufd *ufd; */
1560 /* ufd = getskufd(sk); */
1561 /* ufd->ignread = block; */
1564 int sockfamily(struct socket *sk)
1569 if(ufd->type != UFD_SOCK) {
1573 return(ufd->d.s.family);
1576 int sockpeeraddr(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1581 if(ufd->type != UFD_SOCK) {
1585 if(ufd->d.s.remote == NULL)
1587 *namebuf = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, ufd->d.s.remotelen);
1589 *lenbuf = ufd->d.s.remotelen;
1593 char *formatsockpeer(struct socket *sk)
1595 struct sockaddr *name;
1599 if(sockpeeraddr(sk, &name, &nlen))
1601 ret = formataddress(name, nlen);
1606 int addreq(struct sockaddr *x, struct sockaddr *y)
1608 struct sockaddr_un *u1, *u2;
1609 struct sockaddr_in *n1, *n2;
1611 struct sockaddr_in6 *s1, *s2;
1614 if(x->sa_family != y->sa_family)
1616 switch(x->sa_family) {
1618 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1619 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1623 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1624 if(n1->sin_port != n2->sin_port)
1626 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1631 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1632 if(s1->sin6_port != s2->sin6_port)
1634 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1642 char *formataddress(struct sockaddr *arg, socklen_t arglen)
1644 struct sockaddr_in *ipv4;
1646 struct sockaddr_in6 *ipv6;
1648 static char *ret = NULL;
1654 switch(arg->sa_family)
1657 ret = sstrdup("Unix socket");
1660 ipv4 = (struct sockaddr_in *)arg;
1661 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1663 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1667 ipv6 = (struct sockaddr_in6 *)arg;
1668 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1670 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
1674 errno = EPFNOSUPPORT;
1683 * It was very nice to use this, but it seems
1684 * to mess things up, so I guess it has to go... :-(
1687 static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1689 struct sockaddr *arg;
1691 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1692 * lowercase letters to 1, so I do this
1694 struct sockaddr_in *ipv4;
1697 arg = *(struct sockaddr **)(args[0]);
1698 arglen = *(socklen_t *)(args[1]);
1699 switch(arg->sa_family)
1702 UNIX = (struct sockaddr_un *)arg;
1703 ret = fprintf(stream, "%s", UNIX->sun_path);
1706 ipv4 = (struct sockaddr_in *)arg;
1707 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1711 errno = EPFNOSUPPORT;
1717 static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1720 argtypes[0] = PA_POINTER;
1722 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1723 * be an int, so I guess this should be
1729 static int init(int hup)
1734 if(register_printf_function('N', formataddress, formataddress_arginfo))
1736 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1744 static void terminate(void)
1752 static struct module me =
1760 .terminate = terminate