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 struct ufd *ufds = NULL;
124 static struct scons *rbatch, *wbatch, *cbatch;
127 /* XXX: Get autoconf for all this... */
128 int getpublicaddr(int af, struct sockaddr **addr, socklen_t *lenbuf)
130 struct sockaddr_in *ipv4;
131 struct configvar *var;
135 struct ifreq *ifr, req;
140 var = confgetvar("net", "visibleipv4");
141 if(var->val.ipv4.s_addr != 0)
143 ipv4 = smalloc(sizeof(*ipv4));
144 ipv4->sin_family = AF_INET;
145 ipv4->sin_addr.s_addr = var->val.ipv4.s_addr;
146 *addr = (struct sockaddr *)ipv4;
147 *lenbuf = sizeof(*ipv4);
150 if((pif = icswcstombs(confgetstr("net", "publicif"), NULL, NULL)) == NULL)
152 flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno));
157 if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
159 conf.ifc_buf = smalloc(conf.ifc_len = 65536);
160 if(ioctl(sock, SIOCGIFCONF, &conf) < 0)
166 bufend = ((char *)conf.ifc_buf) + conf.ifc_len;
168 for(ifr = conf.ifc_ifcu.ifcu_req; (void *)ifr < bufend; ifr++)
170 if(strcmp(ifr->ifr_name, pif))
172 memset(&req, 0, sizeof(req));
173 memcpy(req.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
174 if(ioctl(sock, SIOCGIFFLAGS, &req) < 0)
176 if(!(req.ifr_flags & IFF_UP))
178 flog(LOG_WARNING, "public interface is down");
181 if(ifr->ifr_addr.sa_family != AF_INET)
183 flog(LOG_WARNING, "address of the public interface is not AF_INET");
186 ipv4 = smalloc(sizeof(*ipv4));
187 memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr));
194 *addr = (struct sockaddr *)ipv4;
195 *lenbuf = sizeof(*ipv4);
204 static struct socket *newsock1(int dgram)
208 new = memset(smalloc(sizeof(*new)), 0, sizeof(*new));
216 static struct socket *sockpair(int dgram)
218 struct socket *s1, *s2;
220 s1 = newsock1(dgram);
221 s2 = newsock1(dgram);
228 static void sksetstate(struct socket *sk, int state)
231 sk->back->state = state;
234 static void closeufd(struct ufd *ufd)
241 static void freeufd(struct ufd *ufd)
243 if(ufd->next != NULL)
244 ufd->next->prev = ufd->prev;
245 if(ufd->prev != NULL)
246 ufd->prev->next = ufd->next;
252 if(ufd->type == UFD_SOCK) {
253 if(ufd->d.s.remote != NULL)
254 free(ufd->d.s.remote);
259 static struct ufd *mkufd(int fd, int type, struct socket *sk)
263 ufd = memset(smalloc(sizeof(*ufd)), 0, sizeof(*ufd));
267 getsock(ufd->sk = sk);
270 if(type == UFD_SOCK) {
271 ufd->d.s.ucred.uid = -1;
272 ufd->d.s.ucred.gid = -1;
281 static struct ufd *dupufd(struct ufd *ufd)
287 nsk = sockpair(ufd->sk->dgram);
290 nufd = mkufd(ufd->fd, ufd->type, nsk);
293 if((nufd->fd = dup(ufd->fd)) < 0)
295 flog(LOG_WARNING, "could not dup() fd: %s", strerror(errno));
299 sksetstate(nsk, SOCK_EST);
300 if(ufd->type == UFD_SOCK) {
301 nufd->d.s.family = ufd->d.s.family;
302 nufd->d.s.type = ufd->d.s.type;
303 nufd->d.s.ucred.uid = ufd->d.s.ucred.uid;
304 nufd->d.s.ucred.gid = ufd->d.s.ucred.gid;
305 if(ufd->d.s.remote != NULL)
306 nufd->d.s.remote = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, nufd->d.s.remotelen = ufd->d.s.remotelen);
307 } else if(ufd->type == UFD_LISTEN) {
308 nufd->d.l.family = ufd->d.l.family;
313 static struct socket *mksock(int domain, int type)
319 if((fd = socket(domain, type, 0)) < 0)
321 flog(LOG_CRIT, "could not create socket: %s", strerror(errno));
324 sk = sockpair(type == SOCK_DGRAM);
325 ufd = mkufd(fd, UFD_SOCK, sk);
326 ufd->d.s.family = domain;
327 ufd->d.s.type = type;
328 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
332 struct socket *wrapsock(int fd)
338 ufd = mkufd(fd, UFD_PIPE, sk->back);
339 sksetstate(sk, SOCK_EST);
340 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
344 void getsock(struct socket *sk)
349 static void freesock(struct socket *sk)
351 struct dgrambuf *buf;
354 while((buf = sk->buf.d.f) != NULL) {
355 sk->buf.d.f = buf->next;
359 if(sk->buf.s.buf != NULL)
366 void putsock(struct socket *sk)
370 if(--(sk->refcount) < 0) {
371 flog(LOG_CRIT, "BUG: socket refcount < 0");
374 if((sk->refcount == 0) && (sk->back->refcount == 0)) {
381 static void linksock(struct scons **list, struct socket *sk)
385 for(sc = *list; sc != NULL; sc = sc->n) {
389 sc = smalloc(sizeof(*sc));
398 void sockpushdata(struct socket *sk, void *buf, size_t size)
405 sizebuf(&sk->buf.s.buf, &sk->buf.s.bufsize, sk->buf.s.datasize + size, 1, 1);
406 memmove(sk->buf.s.buf + size, sk->buf.s.buf, sk->buf.s.datasize);
407 memcpy(sk->buf.s.buf, buf, size);
408 sk->buf.s.datasize += size;
409 linksock(&rbatch, sk);
413 /* Read as the preterite of `read' */
414 void sockread(struct socket *sk)
416 if((sockgetdatalen(sk) == 0) && (sk->eos == 1))
417 linksock(&rbatch, sk);
418 linksock(&wbatch, sk->back);
421 void freedgbuf(struct dgrambuf *dg)
430 struct dgrambuf *sockgetdgbuf(struct socket *sk)
432 struct dgrambuf *dbuf;
434 if((dbuf = sk->buf.d.f) == NULL)
436 sk->buf.d.f = dbuf->next;
437 if(dbuf->next == NULL)
444 void *sockgetinbuf(struct socket *sk, size_t *size)
447 struct dgrambuf *dbuf;
450 dbuf = sockgetdgbuf(sk);
456 if((sk->buf.s.buf == NULL) || (sk->buf.s.datasize == 0))
462 *size = sk->buf.s.datasize;
463 sk->buf.s.buf = NULL;
464 sk->buf.s.bufsize = sk->buf.s.datasize = 0;
470 void sockqueue(struct socket *sk, void *data, size_t size)
472 struct dgrambuf *new;
473 struct sockaddr *remote;
478 if(sk->state == SOCK_STL)
481 if(sockpeeraddr(sk, &remote, &remotelen))
483 new = smalloc(sizeof(*new));
485 memcpy(new->data = smalloc(size), data, new->size = size);
487 new->addrlen = remotelen;
488 if(sk->back->buf.d.l == NULL)
490 sk->back->buf.d.l = sk->back->buf.d.f = new;
492 sk->back->buf.d.l->next = new;
493 sk->back->buf.d.l = new;
496 sizebuf(&(sk->back->buf.s.buf), &(sk->back->buf.s.bufsize), sk->back->buf.s.datasize + size, 1, 1);
497 memcpy(sk->back->buf.s.buf + sk->back->buf.s.datasize, data, size);
498 sk->back->buf.s.datasize += size;
500 linksock(&rbatch, sk->back);
503 void sockqueuedg(struct socket *sk, struct dgrambuf *dg)
505 if(sk->state == SOCK_STL) {
510 flog(LOG_ERR, "BUG: sockqueuedg called on non-dgram socket");
515 if(sk->back->buf.d.l == NULL)
517 sk->back->buf.d.l = sk->back->buf.d.f = dg;
519 sk->back->buf.d.l->next = dg;
520 sk->back->buf.d.l = dg;
522 linksock(&rbatch, sk->back);
525 void sockeos(struct socket *sk)
527 sksetstate(sk, SOCK_STL);
528 if(sk->back->eos == 0)
530 linksock(&rbatch, sk->back);
533 static void sockerror(struct socket *sk, int en)
535 sksetstate(sk, SOCK_STL);
536 if(sk->back->errcb != NULL)
537 sk->back->errcb(sk->back, en, sk->back->data);
540 static void recvcmsg(struct ufd *ufd, struct msghdr *msg)
542 struct cmsghdr *cmsg;
544 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
546 #if UNIX_AUTH_STYLE == 1
547 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
550 if(ufd->d.s.ucred.uid == -1)
552 cred = (struct ucred *)CMSG_DATA(cmsg);
553 ufd->d.s.ucred.uid = cred->uid;
554 ufd->d.s.ucred.gid = cred->gid;
561 static int ufddgram(struct ufd *ufd)
565 if(ufd->type == UFD_SOCK) {
566 dgram = ufd->d.s.type == SOCK_DGRAM;
567 } else if(ufd->type == UFD_PIPE) {
570 flog(LOG_ERR, "BUG: calling ufddgram on ufd of bad type %i", ufd->type);
573 if(ufd->sk == NULL) {
574 flog(LOG_ERR, "BUG: calling ufddgram on socketless ufd (type %i)", ufd->type);
577 if(dgram != ufd->sk->dgram) {
578 flog(LOG_ERR, "BUG: ufd/socket dgram value mismatch");
584 static void sockrecv(struct ufd *ufd)
588 struct dgrambuf *dbuf;
594 memset(&msg, 0, sizeof(msg));
595 msg.msg_iov = &bufvec;
597 msg.msg_control = cbuf;
598 msg.msg_controllen = sizeof(cbuf);
599 if((dgram = ufddgram(ufd)) < 0)
602 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
603 if(ioctl(ufd->fd, SIOCINQ, &inq))
605 /* I don't really know what could go wrong here, so let's
606 * assume it's transient. */
607 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), ufd->fd);
613 dbuf = smalloc(sizeof(*dbuf));
614 dbuf->data = smalloc(inq);
615 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
616 msg.msg_name = dbuf->addr;
617 msg.msg_namelen = dbuf->addrlen;
618 bufvec.iov_base = dbuf->data;
619 bufvec.iov_len = inq;
620 ret = recvmsg(ufd->fd, &msg, 0);
621 dbuf->addrlen = msg.msg_namelen;
625 if((errno == EINTR) || (errno == EAGAIN))
628 sockerror(ufd->sk, errno);
631 if(msg.msg_flags & MSG_CTRUNC)
632 flog(LOG_DEBUG, "ancillary data was truncated");
635 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
636 * have EOF), but rather an empty packet. I don't know if any
637 * other potential DGRAM protocols might have an EOF
638 * condition, so let's play safe. */
642 if((ufd->type != UFD_SOCK) || !((ufd->d.s.family == AF_INET) || (ufd->d.s.family == AF_INET6)))
649 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
650 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
652 sockqueuedg(ufd->sk, dbuf);
654 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
655 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
656 * how to read the inqueue size on other OSs */
657 if(ufd->type == UFD_SOCK) {
658 if(ioctl(ufd->fd, SIOCINQ, &inq))
660 /* I don't really know what could go wrong here, so let's
661 * assume it's transient. */
662 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), ufd->fd);
666 /* There are perils when trying to use SIOCINQ on files >2GiB... */
674 /* This part could be optimized by telling the kernel to read
675 * directly into ufd->sk->back->buf, but that would be uglier
676 * by not using the socket function interface. */
678 if(ufd->type == UFD_SOCK)
680 bufvec.iov_base = buf;
681 bufvec.iov_len = inq;
682 ret = recvmsg(ufd->fd, &msg, 0);
684 ret = read(ufd->fd, buf, inq);
685 msg.msg_controllen = 0;
691 if((errno == EINTR) || (errno == EAGAIN))
694 sockerror(ufd->sk, errno);
697 if(msg.msg_flags & MSG_CTRUNC)
698 flog(LOG_DEBUG, "ancillary data was truncated");
708 sockqueue(ufd->sk, buf, ret);
713 static void sockflush(struct ufd *ufd)
716 struct dgrambuf *dbuf;
719 if((dgram = ufddgram(ufd)) < 0)
722 dbuf = sockgetdgbuf(ufd->sk);
723 sendto(ufd->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
726 if(ufd->type == UFD_SOCK)
727 ret = send(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
729 ret = write(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize);
731 /* For now, assume transient error, since
732 * the socket is polled for errors */
736 memmove(ufd->sk->buf.s.buf, ((char *)ufd->sk->buf.s.buf) + ret, ufd->sk->buf.s.datasize -= ret);
742 void closesock(struct socket *sk)
745 struct sockaddr_un *un;
747 if((sk->family == AF_UNIX) && !sockgetlocalname(sk, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX))
749 if((sk->state == SOCK_LST) && strchr(un->sun_path, '/'))
751 if(unlink(un->sun_path))
752 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
756 sksetstate(sk, SOCK_STL);
760 size_t sockgetdatalen(struct socket *sk)
767 for(b = sk->buf.d.f; b != NULL; b = b->next)
770 ret = sk->buf.s.datasize;
775 size_t sockqueuesize(struct socket *sk)
777 return(sockgetdatalen(sk->back));
781 * Seriously, I don't know if it's naughty or not to remove
782 * pre-existing Unix sockets.
784 static int rebindunix(struct ufd *ufd, struct sockaddr *name, socklen_t namelen)
786 struct sockaddr_un *un;
789 if((ufd->d.l.family != AF_UNIX) || (name->sa_family != PF_UNIX))
791 un = (struct sockaddr_un *)name;
792 if(stat(un->sun_path, &sb))
794 if(!S_ISSOCK(sb.st_mode))
796 if(unlink(un->sun_path))
798 if(bind(ufd->fd, name, namelen) < 0)
803 void closelport(struct lport *lp)
809 * The difference between netcslisten() and netcslistenlocal() is that
810 * netcslistenlocal() always listens on the local host, instead of
811 * following proxy/passive mode directions. It is suitable for eg. the
812 * UI channel, while the file sharing networks should, naturally, use
813 * netcslisten() instead.
816 struct lport *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
823 /* I don't know if this is actually correct (it probably isn't),
824 * but since, at on least Linux systems, PF_* are specifically
825 * #define'd to their AF_* counterparts, it allows for a severely
826 * smoother implementation. If it breaks something on your
827 * platform, please tell me so.
829 if((fd = socket(name->sa_family, type, 0)) < 0)
831 if(confgetint("net", "reuseaddr")) {
833 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
835 ufd = mkufd(fd, UFD_LISTEN, NULL);
836 ufd->d.l.family = name->sa_family;
837 lp = memset(smalloc(sizeof(*lp)), 0, sizeof(*lp));
840 if((bind(fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(ufd, name, namelen) < 0))) {
844 if(listen(fd, 16) < 0)
854 struct lport *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
856 if(confgetint("net", "mode") == 1)
861 if(confgetint("net", "mode") == 0)
862 return(netcslistenlocal(type, name, namelen, func, data));
867 struct lport *netcstcplisten(int port, int local, void (*func)(struct lport *, struct socket *, void *), void *data)
869 struct sockaddr_in addr;
871 struct sockaddr_in6 addr6;
873 struct lport *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct lport *, struct socket *, void *), void *);
877 csfunc = netcslistenlocal;
879 csfunc = netcslisten;
881 memset(&addr6, 0, sizeof(addr6));
882 addr6.sin6_family = AF_INET6;
883 addr6.sin6_port = htons(port);
884 addr6.sin6_addr = in6addr_any;
885 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
887 if((ret == NULL) && (errno != EAFNOSUPPORT))
890 memset(&addr, 0, sizeof(addr));
891 addr.sin_family = AF_INET;
892 addr.sin_port = htons(port);
893 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
896 struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
901 mode = confgetint("net", "mode");
902 if((mode == 0) || (mode == 1))
904 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
906 if(bind(sk->ufd->fd, name, namelen) < 0)
911 sksetstate(sk, SOCK_EST);
918 struct socket *netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
922 nufd = dupufd(sk->back->ufd);
923 getsock(sk = nufd->sk->back);
924 memcpy(nufd->d.s.remote = smalloc(addrlen), addr, nufd->d.s.remotelen = addrlen);
929 struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
934 mode = confgetint("net", "mode");
935 if((mode == 0) || (mode == 1))
937 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
939 memcpy(sk->ufd->d.s.remote = smalloc(addrlen), addr, sk->ufd->d.s.remotelen = addrlen);
940 sk->back->conncb = func;
941 sk->back->data = data;
942 if(!connect(sk->ufd->fd, addr, addrlen))
944 sksetstate(sk, SOCK_EST);
945 linksock(&cbatch, sk->back);
948 if(errno == EINPROGRESS)
950 sksetstate(sk, SOCK_SYN);
960 static void acceptunix(struct ufd *ufd)
965 #if UNIX_AUTH_STYLE == 1
966 if(setsockopt(ufd->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
967 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", ufd->fd, strerror(errno));
968 #elif UNIX_AUTH_STYLE == 2
969 if(getpeereid(ufd->fd, &ufd->d.s.ucred.uid, &ufd->d.s.ucred.gid) < 0)
971 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", ufd->fd, strerror(errno));
972 ufd->d.s.ucred.uid = -1;
973 ufd->d.s.ucred.gid = -1;
978 static void runbatches(void)
980 struct scons *sc, *nsc;
982 for(sc = cbatch, cbatch = NULL; sc; sc = nsc) {
984 if(sc->s->conncb != NULL)
985 sc->s->conncb(sc->s, 0, sc->s->data);
988 for(sc = rbatch, rbatch = NULL; sc; sc = nsc) {
990 if(sc->s->readcb != NULL)
991 sc->s->readcb(sc->s, sc->s->data);
992 if((sockgetdatalen(sc->s) == 0) && (sc->s->eos == 1)) {
993 if(sc->s->errcb != NULL)
994 sc->s->errcb(sc->s, 0, sc->s->data);
999 for(sc = wbatch, wbatch = NULL; sc; sc = nsc) {
1001 if(sc->s->writecb != NULL)
1002 sc->s->writecb(sc->s, sc->s->data);
1007 static void cleansocks(void)
1009 struct ufd *ufd, *next;
1011 for(ufd = ufds; ufd != NULL; ufd = next) {
1013 if(ufd->sk && (sockgetdatalen(ufd->sk) == 0)) {
1014 if(ufd->sk->eos == 1) {
1019 if((ufd->sk->refcount == 1) && (ufd->sk->back->refcount == 0)) {
1027 int pollsocks(int timeout)
1032 fd_set rfds, wfds, efds;
1033 struct ufd *ufd, *nufd;
1035 struct sockaddr_storage ss;
1043 for(maxfd = 0, ufd = ufds; ufd != NULL; ufd = ufd->next) {
1047 FD_SET(ufd->fd, &rfds);
1048 if(ufd->sk != NULL) {
1049 if(sockgetdatalen(ufd->sk) > 0)
1050 FD_SET(ufd->fd, &wfds);
1051 else if(ufd->sk->state == SOCK_SYN)
1052 FD_SET(ufd->fd, &wfds);
1054 FD_SET(ufd->fd, &efds);
1058 if(rbatch || wbatch || cbatch)
1060 tv.tv_sec = timeout / 1000;
1061 tv.tv_usec = (timeout % 1000) * 1000;
1062 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
1064 if(errno != EINTR) {
1065 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
1066 /* To avoid CPU hogging in case it's bad, which it
1072 for(ufd = ufds; ufd != NULL; ufd = ufd->next) {
1075 if(ufd->type == UFD_LISTEN) {
1076 if(FD_ISSET(ufd->fd, &rfds)) {
1078 if((newfd = accept(ufd->fd, (struct sockaddr *)&ss, &sslen)) < 0) {
1079 if(ufd->d.l.lp->errcb != NULL)
1080 ufd->d.l.lp->errcb(ufd->d.l.lp, errno, ufd->d.l.lp->data);
1083 nufd = mkufd(newfd, UFD_SOCK, nsk);
1084 nufd->d.s.family = ufd->d.l.family;
1085 sksetstate(nsk, SOCK_EST);
1086 memcpy(nufd->d.s.remote = smalloc(sslen), &ss, sslen);
1087 nufd->d.s.remotelen = sslen;
1088 if(ss.ss_family == PF_UNIX)
1090 if(ufd->d.l.lp->acceptcb != NULL)
1091 ufd->d.l.lp->acceptcb(ufd->d.l.lp, nsk->back, ufd->d.l.lp->data);
1094 if(FD_ISSET(ufd->fd, &efds)) {
1095 retlen = sizeof(ret);
1096 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1097 if(ufd->d.l.lp->errcb != NULL)
1098 ufd->d.l.lp->errcb(ufd->d.l.lp, ret, ufd->d.l.lp->data);
1102 if(ufd->sk->state == SOCK_SYN) {
1103 if(FD_ISSET(ufd->fd, &efds)) {
1104 retlen = sizeof(ret);
1105 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1106 if(ufd->sk->back->conncb != NULL)
1107 ufd->sk->back->conncb(ufd->sk->back, ret, ufd->sk->back->data);
1111 if(FD_ISSET(ufd->fd, &rfds) || FD_ISSET(ufd->fd, &wfds)) {
1112 sksetstate(ufd->sk, SOCK_EST);
1113 linksock(&cbatch, ufd->sk->back);
1115 } else if(ufd->sk->state == SOCK_EST) {
1116 if(FD_ISSET(ufd->fd, &efds)) {
1117 retlen = sizeof(ret);
1118 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1119 sockerror(ufd->sk, ret);
1123 if(FD_ISSET(ufd->fd, &rfds))
1127 if(FD_ISSET(ufd->fd, &wfds))
1137 static struct ufd *getskufd(struct socket *sk)
1140 if(sk->back->ufd != NULL)
1141 return(sk->back->ufd);
1142 if((sk = sk->back->pnext) == NULL)
1148 int socksettos(struct socket *sk, int tos)
1154 if(ufd->type != UFD_SOCK) {
1158 if(ufd->d.s.family == AF_UNIX)
1159 return(0); /* Unix sockets are always perfect. :) */
1160 if(ufd->d.s.family == AF_INET)
1167 case SOCK_TOS_MINCOST:
1170 case SOCK_TOS_MAXREL:
1173 case SOCK_TOS_MAXTP:
1176 case SOCK_TOS_MINDELAY:
1180 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1183 if(setsockopt(ufd->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
1185 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1190 if(ufd->d.s.family == AF_INET6)
1196 case SOCK_TOS_MINCOST:
1197 buf = confgetint("net", "diffserv-mincost");
1199 case SOCK_TOS_MAXREL:
1200 buf = confgetint("net", "diffserv-maxrel");
1202 case SOCK_TOS_MAXTP:
1203 buf = confgetint("net", "diffserv-maxtp");
1205 case SOCK_TOS_MINDELAY:
1206 buf = confgetint("net", "diffserv-mindelay");
1209 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1213 On Linux, the API IPv6 flow label management doesn't seem to
1214 be entirely complete, so I guess this will have to wait.
1216 if(setsockopt(...) < 0)
1218 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1224 flog(LOG_WARNING, "could not set TOS on sock of family %i", ufd->d.s.family);
1231 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1233 struct sockaddr_storage addr;
1237 static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1239 static char buf[80];
1241 struct sockaddr_in *ipv4;
1245 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1248 data->callback(NULL, 0, data->data);
1250 ipv4 = (struct sockaddr_in *)&data->addr;
1251 memcpy(&ipv4->sin_addr, buf, 4);
1252 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1256 data->callback(NULL, 0, data->data);
1262 int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1269 struct resolvedata *rdata;
1270 struct sockaddr_in ipv4;
1276 if((p = strchr(addr, ':')) != NULL)
1281 ipv4.sin_family = AF_INET;
1282 ipv4.sin_port = htons(port);
1283 if(inet_aton(addr, &ipv4.sin_addr))
1285 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1287 sigemptyset(&sigset);
1288 sigaddset(&sigset, SIGCHLD);
1289 sigprocmask(SIG_BLOCK, &sigset, NULL);
1290 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1292 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1297 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1298 for(i = 3; i < FD_SETSIZE; i++)
1303 signal(SIGALRM, SIG_DFL);
1305 if((he = gethostbyname(addr)) == NULL)
1307 write(pfd[1], he->h_addr_list[0], 4);
1311 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1312 rdata = smalloc(sizeof(*rdata));
1314 rdata->callback = callback;
1316 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1317 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1318 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1325 static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1328 struct sockaddr_storage name;
1334 if(getsockname(fd, (struct sockaddr *)&name, &len) < 0)
1336 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
1339 *namebuf = memcpy(smalloc(len), &name, len);
1345 int lstgetlocalname(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1350 return(getlocalname(ufd->fd, namebuf, lenbuf));
1353 int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1358 if(ufd->type != UFD_SOCK) {
1362 return(getlocalname(ufd->fd, namebuf, lenbuf));
1365 static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1367 if(dst->sa_family != src->sa_family)
1369 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1372 switch(src->sa_family)
1375 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1378 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1381 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1386 static int makepublic(struct sockaddr *addr)
1390 struct sockaddr *pname;
1392 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1394 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1399 sethostaddr(addr, pname);
1404 static int getremotename(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1407 struct sockaddr *name;
1409 switch(confgetint("net", "mode")) {
1412 if(!getlocalname(fd, &name, &len)) {
1418 flog(LOG_ERR, "could not get remotely accessible name by any means");
1424 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1430 int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1435 if(ufd->type != UFD_SOCK) {
1443 return(getremotename(ufd->fd, namebuf, lenbuf));
1446 int lstgetremotename(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1451 return(getremotename(ufd->fd, namebuf, lenbuf));
1454 int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1456 struct sockaddr *name1, *name2;
1457 socklen_t len1, len2;
1458 struct ufd *ufd1, *ufd2;
1460 ufd1 = getskufd(sk);
1461 ufd2 = getskufd(sk2);
1462 if((ufd1->type != UFD_SOCK) || (ufd2->type != UFD_SOCK)) {
1466 if(ufd1->d.s.family != ufd2->d.s.family)
1468 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1471 if(getremotename(ufd1->fd, &name1, &len1))
1473 if(getremotename(ufd2->fd, &name2, &len2)) {
1477 sethostaddr(name1, name2);
1484 int lstgetremotename2(struct lport *lp, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1486 struct sockaddr *name1, *name2;
1487 socklen_t len1, len2;
1488 struct ufd *ufd1, *ufd2;
1491 ufd2 = getskufd(sk2);
1492 if(ufd2->type != UFD_SOCK) {
1496 if(ufd1->d.s.family != ufd2->d.s.family)
1498 flog(LOG_ERR, "using lstgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1501 if(getremotename(ufd1->fd, &name1, &len1))
1503 if(getremotename(ufd2->fd, &name2, &len2)) {
1507 sethostaddr(name1, name2);
1514 int getucred(struct socket *sk, uid_t *uid, gid_t *gid)
1519 if(ufd->type != UFD_SOCK) {
1523 if(ufd->d.s.family != AF_UNIX) {
1527 *uid = ufd->d.s.ucred.uid;
1528 *gid = ufd->d.s.ucred.gid;
1532 void sockblock(struct socket *sk, int block)
1537 ufd->ignread = block;
1540 int sockfamily(struct socket *sk)
1545 if(ufd->type != UFD_SOCK) {
1549 return(ufd->d.s.family);
1552 int sockpeeraddr(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1557 if(ufd->type != UFD_SOCK) {
1561 if(ufd->d.s.remote == NULL)
1563 *namebuf = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, ufd->d.s.remotelen);
1565 *lenbuf = ufd->d.s.remotelen;
1569 char *formatsockpeer(struct socket *sk)
1571 struct sockaddr *name;
1575 if(sockpeeraddr(sk, &name, &nlen))
1577 ret = formataddress(name, nlen);
1582 int addreq(struct sockaddr *x, struct sockaddr *y)
1584 struct sockaddr_un *u1, *u2;
1585 struct sockaddr_in *n1, *n2;
1587 struct sockaddr_in6 *s1, *s2;
1590 if(x->sa_family != y->sa_family)
1592 switch(x->sa_family) {
1594 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1595 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1599 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1600 if(n1->sin_port != n2->sin_port)
1602 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1607 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1608 if(s1->sin6_port != s2->sin6_port)
1610 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1618 char *formataddress(struct sockaddr *arg, socklen_t arglen)
1620 struct sockaddr_in *ipv4;
1622 struct sockaddr_in6 *ipv6;
1624 static char *ret = NULL;
1630 switch(arg->sa_family)
1633 ret = sstrdup("Unix socket");
1636 ipv4 = (struct sockaddr_in *)arg;
1637 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1639 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1643 ipv6 = (struct sockaddr_in6 *)arg;
1644 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1646 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
1650 errno = EPFNOSUPPORT;
1659 * It was very nice to use this, but it seems
1660 * to mess things up, so I guess it has to go... :-(
1663 static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1665 struct sockaddr *arg;
1667 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1668 * lowercase letters to 1, so I do this
1670 struct sockaddr_in *ipv4;
1673 arg = *(struct sockaddr **)(args[0]);
1674 arglen = *(socklen_t *)(args[1]);
1675 switch(arg->sa_family)
1678 UNIX = (struct sockaddr_un *)arg;
1679 ret = fprintf(stream, "%s", UNIX->sun_path);
1682 ipv4 = (struct sockaddr_in *)arg;
1683 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1687 errno = EPFNOSUPPORT;
1693 static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1696 argtypes[0] = PA_POINTER;
1698 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1699 * be an int, so I guess this should be
1705 static int init(int hup)
1710 if(register_printf_function('N', formataddress, formataddress_arginfo))
1712 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1720 static void terminate(void)
1728 static struct module me =
1736 .terminate = terminate