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 /* Diffserv should be supported on IPv4, too, but I don't know the
71 /** The Diffserv value to use on IPv6 connections when the
72 * minimize cost TOS value is used (see the TOS VALUES
74 {CONF_VAR_INT, "diffserv-mincost", {.num = 0}},
75 /** The Diffserv value to use on IPv6 connections when the
76 * maximize reliability TOS value is used (see the TOS VALUES
78 {CONF_VAR_INT, "diffserv-maxrel", {.num = 0}},
79 /** The Diffserv value to use on IPv6 connections when the
80 * maximize throughput TOS value is used (see the TOS VALUES
82 {CONF_VAR_INT, "diffserv-maxtp", {.num = 0}},
83 /** The Diffserv value to use on IPv6 connections when the
84 * minimize delay TOS value is used (see the TOS VALUES
86 {CONF_VAR_INT, "diffserv-mindelay", {.num = 0}},
100 struct ufd *next, *prev;
109 struct sockaddr *remote;
123 static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf);
125 static struct ufd *ufds = NULL;
126 static struct scons *rbatch, *wbatch, *cbatch;
129 /* XXX: Get autoconf for all this... */
130 int getpublicaddr(int af, struct sockaddr **addr, socklen_t *lenbuf)
132 struct sockaddr_in *ipv4;
133 struct configvar *var;
137 struct ifreq *ifr, req;
142 var = confgetvar("net", "visibleipv4");
143 if(var->val.ipv4.s_addr != 0)
145 ipv4 = smalloc(sizeof(*ipv4));
146 ipv4->sin_family = AF_INET;
147 ipv4->sin_addr.s_addr = var->val.ipv4.s_addr;
148 *addr = (struct sockaddr *)ipv4;
149 *lenbuf = sizeof(*ipv4);
152 if((pif = icswcstombs(confgetstr("net", "publicif"), NULL, NULL)) == NULL)
154 flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno));
159 if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
161 conf.ifc_buf = smalloc(conf.ifc_len = 65536);
162 if(ioctl(sock, SIOCGIFCONF, &conf) < 0)
168 bufend = ((char *)conf.ifc_buf) + conf.ifc_len;
170 for(ifr = conf.ifc_ifcu.ifcu_req; (void *)ifr < bufend; ifr++)
172 if(strcmp(ifr->ifr_name, pif))
174 memset(&req, 0, sizeof(req));
175 memcpy(req.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
176 if(ioctl(sock, SIOCGIFFLAGS, &req) < 0)
178 if(!(req.ifr_flags & IFF_UP))
180 flog(LOG_WARNING, "public interface is down");
183 if(ifr->ifr_addr.sa_family != AF_INET)
185 flog(LOG_WARNING, "address of the public interface is not AF_INET");
188 ipv4 = smalloc(sizeof(*ipv4));
189 memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr));
196 *addr = (struct sockaddr *)ipv4;
197 *lenbuf = sizeof(*ipv4);
206 static struct socket *newsock1(int dgram)
210 new = memset(smalloc(sizeof(*new)), 0, sizeof(*new));
218 static struct socket *sockpair(int dgram)
220 struct socket *s1, *s2;
222 s1 = newsock1(dgram);
223 s2 = newsock1(dgram);
230 static void sksetstate(struct socket *sk, int state)
233 sk->back->state = state;
236 static void closeufd(struct ufd *ufd)
243 static void freeufd(struct ufd *ufd)
245 if(ufd->next != NULL)
246 ufd->next->prev = ufd->prev;
247 if(ufd->prev != NULL)
248 ufd->prev->next = ufd->next;
254 if(ufd->type == UFD_SOCK) {
255 if(ufd->d.s.remote != NULL)
256 free(ufd->d.s.remote);
261 static struct ufd *mkufd(int fd, int type, struct socket *sk)
265 ufd = memset(smalloc(sizeof(*ufd)), 0, sizeof(*ufd));
269 getsock(ufd->sk = sk);
272 if(type == UFD_SOCK) {
273 ufd->d.s.ucred.uid = -1;
274 ufd->d.s.ucred.gid = -1;
283 static struct ufd *dupufd(struct ufd *ufd)
289 nsk = sockpair(ufd->sk->dgram);
292 nufd = mkufd(ufd->fd, ufd->type, nsk);
295 if((nufd->fd = dup(ufd->fd)) < 0)
297 flog(LOG_WARNING, "could not dup() fd: %s", strerror(errno));
301 sksetstate(nsk, SOCK_EST);
302 if(ufd->type == UFD_SOCK) {
303 nufd->d.s.family = ufd->d.s.family;
304 nufd->d.s.type = ufd->d.s.type;
305 nufd->d.s.ucred.uid = ufd->d.s.ucred.uid;
306 nufd->d.s.ucred.gid = ufd->d.s.ucred.gid;
307 if(ufd->d.s.remote != NULL)
308 nufd->d.s.remote = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, nufd->d.s.remotelen = ufd->d.s.remotelen);
309 } else if(ufd->type == UFD_LISTEN) {
310 nufd->d.l.family = ufd->d.l.family;
315 static struct socket *mksock(int domain, int type)
321 if((fd = socket(domain, type, 0)) < 0)
323 flog(LOG_CRIT, "could not create socket: %s", strerror(errno));
326 sk = sockpair(type == SOCK_DGRAM);
327 ufd = mkufd(fd, UFD_SOCK, sk);
328 ufd->d.s.family = domain;
329 ufd->d.s.type = type;
330 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
334 struct socket *wrapsock(int fd)
340 ufd = mkufd(fd, UFD_PIPE, sk->back);
341 sksetstate(sk, SOCK_EST);
342 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
346 void getsock(struct socket *sk)
351 static void freesock(struct socket *sk)
353 struct dgrambuf *buf;
356 while((buf = sk->buf.d.f) != NULL) {
357 sk->buf.d.f = buf->next;
361 if(sk->buf.s.buf != NULL)
368 void putsock(struct socket *sk)
372 if(--(sk->refcount) < 0) {
373 flog(LOG_CRIT, "BUG: socket refcount < 0");
376 if((sk->refcount == 0) && (sk->back->refcount == 0)) {
383 static void linksock(struct scons **list, struct socket *sk)
387 for(sc = *list; sc != NULL; sc = sc->n) {
391 sc = smalloc(sizeof(*sc));
400 void sockpushdata(struct socket *sk, void *buf, size_t size)
407 sizebuf(&sk->buf.s.buf, &sk->buf.s.bufsize, sk->buf.s.datasize + size, 1, 1);
408 memmove(sk->buf.s.buf + size, sk->buf.s.buf, sk->buf.s.datasize);
409 memcpy(sk->buf.s.buf, buf, size);
410 sk->buf.s.datasize += size;
411 linksock(&rbatch, sk);
415 /* Read as the preterite of `read' */
416 void sockread(struct socket *sk)
418 if((sockgetdatalen(sk) == 0) && (sk->eos == 1))
419 linksock(&rbatch, sk);
420 linksock(&wbatch, sk->back);
423 void freedgbuf(struct dgrambuf *dg)
432 struct dgrambuf *sockgetdgbuf(struct socket *sk)
434 struct dgrambuf *dbuf;
436 if((dbuf = sk->buf.d.f) == NULL)
438 sk->buf.d.f = dbuf->next;
439 if(dbuf->next == NULL)
446 void *sockgetinbuf(struct socket *sk, size_t *size)
449 struct dgrambuf *dbuf;
452 dbuf = sockgetdgbuf(sk);
458 if((sk->buf.s.buf == NULL) || (sk->buf.s.datasize == 0))
464 *size = sk->buf.s.datasize;
465 sk->buf.s.buf = NULL;
466 sk->buf.s.bufsize = sk->buf.s.datasize = 0;
472 void sockqueue(struct socket *sk, void *data, size_t size)
474 struct dgrambuf *new;
475 struct sockaddr *remote;
480 if(sk->state == SOCK_STL)
483 if(sockpeeraddr(sk, &remote, &remotelen))
485 new = smalloc(sizeof(*new));
487 memcpy(new->data = smalloc(size), data, new->size = size);
489 new->addrlen = remotelen;
490 if(sk->back->buf.d.l == NULL)
492 sk->back->buf.d.l = sk->back->buf.d.f = new;
494 sk->back->buf.d.l->next = new;
495 sk->back->buf.d.l = new;
498 sizebuf(&(sk->back->buf.s.buf), &(sk->back->buf.s.bufsize), sk->back->buf.s.datasize + size, 1, 1);
499 memcpy(sk->back->buf.s.buf + sk->back->buf.s.datasize, data, size);
500 sk->back->buf.s.datasize += size;
502 linksock(&rbatch, sk->back);
505 void sockqueuedg(struct socket *sk, struct dgrambuf *dg)
507 if(sk->state == SOCK_STL) {
512 flog(LOG_ERR, "BUG: sockqueuedg called on non-dgram socket");
517 if(sk->back->buf.d.l == NULL)
519 sk->back->buf.d.l = sk->back->buf.d.f = dg;
521 sk->back->buf.d.l->next = dg;
522 sk->back->buf.d.l = dg;
524 linksock(&rbatch, sk->back);
527 void sockerror(struct socket *sk, int en)
529 sksetstate(sk, SOCK_STL);
530 if(sk->back->errcb != NULL)
531 sk->back->errcb(sk->back, en, sk->back->data);
534 static void recvcmsg(struct ufd *ufd, struct msghdr *msg)
536 struct cmsghdr *cmsg;
538 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
540 #if UNIX_AUTH_STYLE == 1
541 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
544 if(ufd->d.s.ucred.uid == -1)
546 cred = (struct ucred *)CMSG_DATA(cmsg);
547 ufd->d.s.ucred.uid = cred->uid;
548 ufd->d.s.ucred.gid = cred->gid;
555 static int ufddgram(struct ufd *ufd)
559 if(ufd->type == UFD_SOCK) {
560 dgram = ufd->d.s.type == SOCK_DGRAM;
561 } else if(ufd->type == UFD_PIPE) {
564 flog(LOG_ERR, "BUG: calling ufddgram on ufd of bad type %i", ufd->type);
567 if(ufd->sk == NULL) {
568 flog(LOG_ERR, "BUG: calling ufddgram on socketless ufd (type %i)", ufd->type);
571 if(dgram != ufd->sk->dgram) {
572 flog(LOG_ERR, "BUG: ufd/socket dgram value mismatch");
578 static void sockrecv(struct ufd *ufd)
582 struct dgrambuf *dbuf;
588 memset(&msg, 0, sizeof(msg));
589 msg.msg_iov = &bufvec;
591 msg.msg_control = cbuf;
592 msg.msg_controllen = sizeof(cbuf);
593 if((dgram = ufddgram(ufd)) < 0)
596 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
597 if(ioctl(ufd->fd, SIOCINQ, &inq))
599 /* I don't really know what could go wrong here, so let's
600 * assume it's transient. */
601 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), ufd->fd);
607 dbuf = smalloc(sizeof(*dbuf));
608 dbuf->data = smalloc(inq);
609 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
610 msg.msg_name = dbuf->addr;
611 msg.msg_namelen = dbuf->addrlen;
612 bufvec.iov_base = dbuf->data;
613 bufvec.iov_len = inq;
614 ret = recvmsg(ufd->fd, &msg, 0);
615 dbuf->addrlen = msg.msg_namelen;
619 if((errno == EINTR) || (errno == EAGAIN))
622 sockerror(ufd->sk, errno);
625 if(msg.msg_flags & MSG_CTRUNC)
626 flog(LOG_DEBUG, "ancillary data was truncated");
629 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
630 * have EOF), but rather an empty packet. I don't know if any
631 * other potential DGRAM protocols might have an EOF
632 * condition, so let's play safe. */
636 if((ufd->type != UFD_SOCK) || !((ufd->d.s.family == AF_INET) || (ufd->d.s.family == AF_INET6)))
643 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
644 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
646 sockqueuedg(ufd->sk, dbuf);
648 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
649 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
650 * how to read the inqueue size on other OSs */
651 if(ufd->type == UFD_SOCK) {
652 if(ioctl(ufd->fd, SIOCINQ, &inq))
654 /* I don't really know what could go wrong here, so let's
655 * assume it's transient. */
656 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), ufd->fd);
660 /* There are perils when trying to use SIOCINQ on files >2GiB... */
668 /* This part could be optimized by telling the kernel to read
669 * directly into ufd->sk->back->buf, but that would be uglier
670 * by not using the socket function interface. */
672 if(ufd->type == UFD_SOCK)
674 bufvec.iov_base = buf;
675 bufvec.iov_len = inq;
676 ret = recvmsg(ufd->fd, &msg, 0);
678 ret = read(ufd->fd, buf, inq);
679 msg.msg_controllen = 0;
685 if((errno == EINTR) || (errno == EAGAIN))
688 sockerror(ufd->sk, errno);
691 if(msg.msg_flags & MSG_CTRUNC)
692 flog(LOG_DEBUG, "ancillary data was truncated");
702 sockqueue(ufd->sk, buf, ret);
707 static void sockflush(struct ufd *ufd)
710 struct dgrambuf *dbuf;
713 if((dgram = ufddgram(ufd)) < 0)
716 dbuf = sockgetdgbuf(ufd->sk);
717 sendto(ufd->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
720 if(ufd->type == UFD_SOCK)
721 ret = send(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
723 ret = write(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize);
725 /* For now, assume transient error, since
726 * the socket is polled for errors */
730 memmove(ufd->sk->buf.s.buf, ((char *)ufd->sk->buf.s.buf) + ret, ufd->sk->buf.s.datasize -= ret);
736 void closesock(struct socket *sk)
738 sksetstate(sk, SOCK_STL);
739 if(sk->back->eos == 0)
741 linksock(&rbatch, sk->back);
744 size_t sockgetdatalen(struct socket *sk)
751 for(b = sk->buf.d.f; b != NULL; b = b->next)
754 ret = sk->buf.s.datasize;
759 size_t sockqueuesize(struct socket *sk)
761 return(sockgetdatalen(sk->back));
765 * Seriously, I don't know if it's naughty or not to remove
766 * pre-existing Unix sockets.
768 static int rebindunix(struct ufd *ufd, struct sockaddr *name, socklen_t namelen)
770 struct sockaddr_un *un;
773 if((ufd->d.l.family != AF_UNIX) || (name->sa_family != PF_UNIX))
775 un = (struct sockaddr_un *)name;
776 if(stat(un->sun_path, &sb))
778 if(!S_ISSOCK(sb.st_mode))
780 if(unlink(un->sun_path))
782 if(bind(ufd->fd, name, namelen) < 0)
787 void closelport(struct lport *lp)
790 struct sockaddr_un *un;
793 if((ufd->d.l.family == AF_UNIX) && !getlocalname(ufd->fd, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX) && strchr(un->sun_path, '/')) {
794 if(unlink(un->sun_path))
795 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
801 * The difference between netcslisten() and netcslistenlocal() is that
802 * netcslistenlocal() always listens on the local host, instead of
803 * following proxy/passive mode directions. It is suitable for eg. the
804 * UI channel, while the file sharing networks should, naturally, use
805 * netcslisten() instead.
808 struct lport *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
815 /* I don't know if this is actually correct (it probably isn't),
816 * but since, at on least Linux systems, PF_* are specifically
817 * #define'd to their AF_* counterparts, it allows for a severely
818 * smoother implementation. If it breaks something on your
819 * platform, please tell me so.
821 if((fd = socket(name->sa_family, type, 0)) < 0)
823 if(confgetint("net", "reuseaddr")) {
825 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
827 ufd = mkufd(fd, UFD_LISTEN, NULL);
828 ufd->d.l.family = name->sa_family;
829 lp = memset(smalloc(sizeof(*lp)), 0, sizeof(*lp));
832 if((bind(fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(ufd, name, namelen) < 0))) {
836 if(listen(fd, 16) < 0)
846 struct lport *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
848 if(confgetint("net", "mode") == 1)
853 if(confgetint("net", "mode") == 0)
854 return(netcslistenlocal(type, name, namelen, func, data));
859 struct lport *netcstcplisten(int port, int local, void (*func)(struct lport *, struct socket *, void *), void *data)
861 struct sockaddr_in addr;
863 struct sockaddr_in6 addr6;
865 struct lport *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct lport *, struct socket *, void *), void *);
869 csfunc = netcslistenlocal;
871 csfunc = netcslisten;
873 memset(&addr6, 0, sizeof(addr6));
874 addr6.sin6_family = AF_INET6;
875 addr6.sin6_port = htons(port);
876 addr6.sin6_addr = in6addr_any;
877 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
879 if((ret == NULL) && (errno != EAFNOSUPPORT))
882 memset(&addr, 0, sizeof(addr));
883 addr.sin_family = AF_INET;
884 addr.sin_port = htons(port);
885 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
888 struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
893 mode = confgetint("net", "mode");
894 if((mode == 0) || (mode == 1))
896 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
898 if(bind(sk->ufd->fd, name, namelen) < 0)
903 sksetstate(sk, SOCK_EST);
910 struct socket *netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
914 nufd = dupufd(sk->back->ufd);
915 getsock(sk = nufd->sk->back);
916 memcpy(nufd->d.s.remote = smalloc(addrlen), addr, nufd->d.s.remotelen = addrlen);
921 struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
926 mode = confgetint("net", "mode");
927 if((mode == 0) || (mode == 1))
929 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
931 memcpy(sk->ufd->d.s.remote = smalloc(addrlen), addr, sk->ufd->d.s.remotelen = addrlen);
932 sk->back->conncb = func;
933 sk->back->data = data;
934 if(!connect(sk->ufd->fd, addr, addrlen))
936 sksetstate(sk, SOCK_EST);
937 linksock(&cbatch, sk->back);
940 if(errno == EINPROGRESS)
942 sksetstate(sk, SOCK_SYN);
952 static void acceptunix(struct ufd *ufd)
957 #if UNIX_AUTH_STYLE == 1
958 if(setsockopt(ufd->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
959 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", ufd->fd, strerror(errno));
960 #elif UNIX_AUTH_STYLE == 2
961 if(getpeereid(ufd->fd, &ufd->d.s.ucred.uid, &ufd->d.s.ucred.gid) < 0)
963 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", ufd->fd, strerror(errno));
964 ufd->d.s.ucred.uid = -1;
965 ufd->d.s.ucred.gid = -1;
970 static void runbatches(void)
972 struct scons *sc, *nsc;
974 for(sc = cbatch, cbatch = NULL; sc; sc = nsc) {
976 if(sc->s->conncb != NULL)
977 sc->s->conncb(sc->s, 0, sc->s->data);
980 for(sc = rbatch, rbatch = NULL; sc; sc = nsc) {
982 if(sc->s->readcb != NULL)
983 sc->s->readcb(sc->s, sc->s->data);
984 if((sockgetdatalen(sc->s) == 0) && (sc->s->eos == 1)) {
985 if(sc->s->errcb != NULL)
986 sc->s->errcb(sc->s, 0, sc->s->data);
991 for(sc = wbatch, wbatch = NULL; sc; sc = nsc) {
993 if(sc->s->writecb != NULL)
994 sc->s->writecb(sc->s, sc->s->data);
999 static void cleansocks(void)
1001 struct ufd *ufd, *next;
1003 for(ufd = ufds; ufd != NULL; ufd = next) {
1005 if(ufd->sk && (sockgetdatalen(ufd->sk) == 0)) {
1006 if(ufd->sk->eos == 1) {
1011 if((ufd->sk->refcount == 1) && (ufd->sk->back->refcount == 0)) {
1019 int pollsocks(int timeout)
1024 fd_set rfds, wfds, efds;
1025 struct ufd *ufd, *nufd;
1027 struct sockaddr_storage ss;
1035 for(maxfd = 0, ufd = ufds; ufd != NULL; ufd = ufd->next) {
1039 FD_SET(ufd->fd, &rfds);
1040 if(ufd->sk != NULL) {
1041 if(sockgetdatalen(ufd->sk) > 0)
1042 FD_SET(ufd->fd, &wfds);
1043 else if(ufd->sk->state == SOCK_SYN)
1044 FD_SET(ufd->fd, &wfds);
1046 FD_SET(ufd->fd, &efds);
1050 if(rbatch || wbatch || cbatch)
1052 tv.tv_sec = timeout / 1000;
1053 tv.tv_usec = (timeout % 1000) * 1000;
1054 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
1056 if(errno != EINTR) {
1057 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
1058 /* To avoid CPU hogging in case it's bad, which it
1064 for(ufd = ufds; ufd != NULL; ufd = ufd->next) {
1067 if(ufd->type == UFD_LISTEN) {
1068 if(FD_ISSET(ufd->fd, &rfds)) {
1070 if((newfd = accept(ufd->fd, (struct sockaddr *)&ss, &sslen)) < 0) {
1071 if(ufd->d.l.lp->errcb != NULL)
1072 ufd->d.l.lp->errcb(ufd->d.l.lp, errno, ufd->d.l.lp->data);
1075 nufd = mkufd(newfd, UFD_SOCK, nsk);
1076 nufd->d.s.family = ufd->d.l.family;
1077 sksetstate(nsk, SOCK_EST);
1078 memcpy(nufd->d.s.remote = smalloc(sslen), &ss, sslen);
1079 nufd->d.s.remotelen = sslen;
1080 if(ss.ss_family == PF_UNIX)
1082 if(ufd->d.l.lp->acceptcb != NULL)
1083 ufd->d.l.lp->acceptcb(ufd->d.l.lp, nsk->back, ufd->d.l.lp->data);
1086 if(FD_ISSET(ufd->fd, &efds)) {
1087 retlen = sizeof(ret);
1088 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1089 if(ufd->d.l.lp->errcb != NULL)
1090 ufd->d.l.lp->errcb(ufd->d.l.lp, ret, ufd->d.l.lp->data);
1094 if(ufd->sk->state == SOCK_SYN) {
1095 if(FD_ISSET(ufd->fd, &efds)) {
1096 retlen = sizeof(ret);
1097 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1098 if(ufd->sk->back->conncb != NULL)
1099 ufd->sk->back->conncb(ufd->sk->back, ret, ufd->sk->back->data);
1103 if(FD_ISSET(ufd->fd, &rfds) || FD_ISSET(ufd->fd, &wfds)) {
1104 sksetstate(ufd->sk, SOCK_EST);
1105 linksock(&cbatch, ufd->sk->back);
1107 } else if(ufd->sk->state == SOCK_EST) {
1108 if(FD_ISSET(ufd->fd, &efds)) {
1109 retlen = sizeof(ret);
1110 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1111 sockerror(ufd->sk, ret);
1115 if(FD_ISSET(ufd->fd, &rfds))
1119 if(FD_ISSET(ufd->fd, &wfds))
1129 static struct ufd *getskufd(struct socket *sk)
1132 if(sk->back->ufd != NULL)
1133 return(sk->back->ufd);
1134 if((sk = sk->back->pnext) == NULL)
1140 int socksettos(struct socket *sk, int tos)
1146 if(ufd->type != UFD_SOCK) {
1150 if(ufd->d.s.family == AF_UNIX)
1151 return(0); /* Unix sockets are always perfect. :) */
1152 if(ufd->d.s.family == AF_INET)
1159 case SOCK_TOS_MINCOST:
1162 case SOCK_TOS_MAXREL:
1165 case SOCK_TOS_MAXTP:
1168 case SOCK_TOS_MINDELAY:
1172 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1175 if(setsockopt(ufd->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
1177 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1182 if(ufd->d.s.family == AF_INET6)
1188 case SOCK_TOS_MINCOST:
1189 buf = confgetint("net", "diffserv-mincost");
1191 case SOCK_TOS_MAXREL:
1192 buf = confgetint("net", "diffserv-maxrel");
1194 case SOCK_TOS_MAXTP:
1195 buf = confgetint("net", "diffserv-maxtp");
1197 case SOCK_TOS_MINDELAY:
1198 buf = confgetint("net", "diffserv-mindelay");
1201 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1205 On Linux, the API IPv6 flow label management doesn't seem to
1206 be entirely complete, so I guess this will have to wait.
1208 if(setsockopt(...) < 0)
1210 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1216 flog(LOG_WARNING, "could not set TOS on sock of family %i", ufd->d.s.family);
1223 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1225 struct sockaddr_storage addr;
1229 static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1231 static char buf[80];
1233 struct sockaddr_in *ipv4;
1237 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1240 data->callback(NULL, 0, data->data);
1242 ipv4 = (struct sockaddr_in *)&data->addr;
1243 memcpy(&ipv4->sin_addr, buf, 4);
1244 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1248 data->callback(NULL, 0, data->data);
1254 int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1261 struct resolvedata *rdata;
1262 struct sockaddr_in ipv4;
1268 if((p = strchr(addr, ':')) != NULL)
1273 ipv4.sin_family = AF_INET;
1274 ipv4.sin_port = htons(port);
1275 if(inet_aton(addr, &ipv4.sin_addr))
1277 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1279 sigemptyset(&sigset);
1280 sigaddset(&sigset, SIGCHLD);
1281 sigprocmask(SIG_BLOCK, &sigset, NULL);
1282 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1284 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1289 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1290 for(i = 3; i < FD_SETSIZE; i++)
1295 signal(SIGALRM, SIG_DFL);
1297 if((he = gethostbyname(addr)) == NULL)
1299 write(pfd[1], he->h_addr_list[0], 4);
1303 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1304 rdata = smalloc(sizeof(*rdata));
1306 rdata->callback = callback;
1308 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1309 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1310 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1317 static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1320 struct sockaddr_storage name;
1326 if(getsockname(fd, (struct sockaddr *)&name, &len) < 0)
1328 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
1331 *namebuf = memcpy(smalloc(len), &name, len);
1337 int lstgetlocalname(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1342 return(getlocalname(ufd->fd, namebuf, lenbuf));
1345 int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1350 if(ufd->type != UFD_SOCK) {
1354 return(getlocalname(ufd->fd, namebuf, lenbuf));
1357 static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1359 if(dst->sa_family != src->sa_family)
1361 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1364 switch(src->sa_family)
1367 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1370 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1373 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1378 static int makepublic(struct sockaddr *addr)
1382 struct sockaddr *pname;
1384 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1386 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1391 sethostaddr(addr, pname);
1396 static int getremotename(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1399 struct sockaddr *name;
1401 switch(confgetint("net", "mode")) {
1404 if(!getlocalname(fd, &name, &len)) {
1410 flog(LOG_ERR, "could not get remotely accessible name by any means");
1416 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1422 int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1427 if(ufd->type != UFD_SOCK) {
1435 return(getremotename(ufd->fd, namebuf, lenbuf));
1438 int lstgetremotename(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1443 return(getremotename(ufd->fd, namebuf, lenbuf));
1446 int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1448 struct sockaddr *name1, *name2;
1449 socklen_t len1, len2;
1450 struct ufd *ufd1, *ufd2;
1452 ufd1 = getskufd(sk);
1453 ufd2 = getskufd(sk2);
1454 if((ufd1->type != UFD_SOCK) || (ufd2->type != UFD_SOCK)) {
1458 if(ufd1->d.s.family != ufd2->d.s.family)
1460 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1463 if(getremotename(ufd1->fd, &name1, &len1))
1465 if(getremotename(ufd2->fd, &name2, &len2)) {
1469 sethostaddr(name1, name2);
1476 int lstgetremotename2(struct lport *lp, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1478 struct sockaddr *name1, *name2;
1479 socklen_t len1, len2;
1480 struct ufd *ufd1, *ufd2;
1483 ufd2 = getskufd(sk2);
1484 if(ufd2->type != UFD_SOCK) {
1488 if(ufd1->d.s.family != ufd2->d.s.family)
1490 flog(LOG_ERR, "using lstgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1493 if(getremotename(ufd1->fd, &name1, &len1))
1495 if(getremotename(ufd2->fd, &name2, &len2)) {
1499 sethostaddr(name1, name2);
1506 int getucred(struct socket *sk, uid_t *uid, gid_t *gid)
1511 if(ufd->type != UFD_SOCK) {
1515 if(ufd->d.s.family != AF_UNIX) {
1519 *uid = ufd->d.s.ucred.uid;
1520 *gid = ufd->d.s.ucred.gid;
1524 void sockblock(struct socket *sk, int block)
1529 ufd->ignread = block;
1532 int sockfamily(struct socket *sk)
1537 if(ufd->type != UFD_SOCK) {
1541 return(ufd->d.s.family);
1544 int sockpeeraddr(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1549 if(ufd->type != UFD_SOCK) {
1553 if(ufd->d.s.remote == NULL)
1555 *namebuf = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, ufd->d.s.remotelen);
1557 *lenbuf = ufd->d.s.remotelen;
1561 char *formatsockpeer(struct socket *sk)
1563 struct sockaddr *name;
1567 if(sockpeeraddr(sk, &name, &nlen))
1569 ret = formataddress(name, nlen);
1574 int addreq(struct sockaddr *x, struct sockaddr *y)
1576 struct sockaddr_un *u1, *u2;
1577 struct sockaddr_in *n1, *n2;
1579 struct sockaddr_in6 *s1, *s2;
1582 if(x->sa_family != y->sa_family)
1584 switch(x->sa_family) {
1586 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1587 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1591 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1592 if(n1->sin_port != n2->sin_port)
1594 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1599 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1600 if(s1->sin6_port != s2->sin6_port)
1602 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1610 char *formataddress(struct sockaddr *arg, socklen_t arglen)
1612 struct sockaddr_in *ipv4;
1614 struct sockaddr_in6 *ipv6;
1616 static char *ret = NULL;
1622 switch(arg->sa_family)
1625 ret = sstrdup("Unix socket");
1628 ipv4 = (struct sockaddr_in *)arg;
1629 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1631 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1635 ipv6 = (struct sockaddr_in6 *)arg;
1636 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1638 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
1642 errno = EPFNOSUPPORT;
1651 * It was very nice to use this, but it seems
1652 * to mess things up, so I guess it has to go... :-(
1655 static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1657 struct sockaddr *arg;
1659 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1660 * lowercase letters to 1, so I do this
1662 struct sockaddr_in *ipv4;
1665 arg = *(struct sockaddr **)(args[0]);
1666 arglen = *(socklen_t *)(args[1]);
1667 switch(arg->sa_family)
1670 UNIX = (struct sockaddr_un *)arg;
1671 ret = fprintf(stream, "%s", UNIX->sun_path);
1674 ipv4 = (struct sockaddr_in *)arg;
1675 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1679 errno = EPFNOSUPPORT;
1685 static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1688 argtypes[0] = PA_POINTER;
1690 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1691 * be an int, so I guess this should be
1697 static int init(int hup)
1702 if(register_printf_function('N', formataddress, formataddress_arginfo))
1704 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1712 static void terminate(void)
1720 static struct module me =
1728 .terminate = terminate