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)
368 if(--(sk->refcount) < 0) {
369 flog(LOG_CRIT, "BUG: socket refcount < 0");
372 if((sk->refcount == 0) && (sk->back->refcount == 0)) {
378 static void linksock(struct scons **list, struct socket *sk)
382 for(sc = *list; sc != NULL; sc = sc->n) {
386 sc = smalloc(sizeof(*sc));
395 void sockpushdata(struct socket *sk, void *buf, size_t size)
402 sizebuf(&sk->buf.s.buf, &sk->buf.s.bufsize, sk->buf.s.datasize + size, 1, 1);
403 memmove(sk->buf.s.buf + size, sk->buf.s.buf, sk->buf.s.datasize);
404 memcpy(sk->buf.s.buf, buf, size);
405 sk->buf.s.datasize += size;
406 linksock(&rbatch, sk);
410 /* Read as the preterite of `read' */
411 void sockread(struct socket *sk)
413 if((sockgetdatalen(sk) == 0) && (sk->eos == 1))
414 linksock(&rbatch, sk);
415 linksock(&wbatch, sk->back);
418 void freedgbuf(struct dgrambuf *dg)
427 struct dgrambuf *sockgetdgbuf(struct socket *sk)
429 struct dgrambuf *dbuf;
431 if((dbuf = sk->buf.d.f) == NULL)
433 sk->buf.d.f = dbuf->next;
434 if(dbuf->next == NULL)
441 void *sockgetinbuf(struct socket *sk, size_t *size)
444 struct dgrambuf *dbuf;
447 dbuf = sockgetdgbuf(sk);
453 if((sk->buf.s.buf == NULL) || (sk->buf.s.datasize == 0))
459 *size = sk->buf.s.datasize;
460 sk->buf.s.buf = NULL;
461 sk->buf.s.bufsize = sk->buf.s.datasize = 0;
467 void sockqueue(struct socket *sk, void *data, size_t size)
469 struct dgrambuf *new;
470 struct sockaddr *remote;
475 if(sk->state == SOCK_STL)
478 if(sockpeeraddr(sk, &remote, &remotelen))
480 new = smalloc(sizeof(*new));
482 memcpy(new->data = smalloc(size), data, new->size = size);
484 new->addrlen = remotelen;
485 if(sk->back->buf.d.l == NULL)
487 sk->back->buf.d.l = sk->back->buf.d.f = new;
489 sk->back->buf.d.l->next = new;
490 sk->back->buf.d.l = new;
493 sizebuf(&(sk->back->buf.s.buf), &(sk->back->buf.s.bufsize), sk->back->buf.s.datasize + size, 1, 1);
494 memcpy(sk->back->buf.s.buf + sk->back->buf.s.datasize, data, size);
495 sk->back->buf.s.datasize += size;
497 linksock(&rbatch, sk->back);
500 void sockqueuedg(struct socket *sk, struct dgrambuf *dg)
502 if(sk->state == SOCK_STL) {
507 flog(LOG_ERR, "BUG: sockqueuedg called on non-dgram socket");
512 if(sk->back->buf.d.l == NULL)
514 sk->back->buf.d.l = sk->back->buf.d.f = dg;
516 sk->back->buf.d.l->next = dg;
517 sk->back->buf.d.l = dg;
519 linksock(&rbatch, sk->back);
522 void sockeos(struct socket *sk)
524 sksetstate(sk, SOCK_STL);
525 if(sk->back->eos == 0)
527 linksock(&rbatch, sk->back);
530 static void sockerror(struct socket *sk, int en)
532 sksetstate(sk, SOCK_STL);
533 if(sk->back->errcb != NULL)
534 sk->back->errcb(sk->back, en, sk->back->data);
537 static void recvcmsg(struct ufd *ufd, struct msghdr *msg)
539 struct cmsghdr *cmsg;
541 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
543 #if UNIX_AUTH_STYLE == 1
544 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
547 if(ufd->d.s.ucred.uid == -1)
549 cred = (struct ucred *)CMSG_DATA(cmsg);
550 ufd->d.s.ucred.uid = cred->uid;
551 ufd->d.s.ucred.gid = cred->gid;
558 static int ufddgram(struct ufd *ufd)
562 if(ufd->type == UFD_SOCK) {
563 dgram = ufd->d.s.type == SOCK_DGRAM;
564 } else if(ufd->type == UFD_PIPE) {
567 flog(LOG_ERR, "BUG: calling ufddgram on ufd of bad type %i", ufd->type);
570 if(ufd->sk == NULL) {
571 flog(LOG_ERR, "BUG: calling ufddgram on socketless ufd (type %i)", ufd->type);
574 if(dgram != ufd->sk->dgram) {
575 flog(LOG_ERR, "BUG: ufd/socket dgram value mismatch");
581 static void sockrecv(struct ufd *ufd)
585 struct dgrambuf *dbuf;
591 memset(&msg, 0, sizeof(msg));
592 msg.msg_iov = &bufvec;
594 msg.msg_control = cbuf;
595 msg.msg_controllen = sizeof(cbuf);
596 if((dgram = ufddgram(ufd)) < 0)
599 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
600 if(ioctl(ufd->fd, SIOCINQ, &inq))
602 /* I don't really know what could go wrong here, so let's
603 * assume it's transient. */
604 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), ufd->fd);
610 dbuf = smalloc(sizeof(*dbuf));
611 dbuf->data = smalloc(inq);
612 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
613 msg.msg_name = dbuf->addr;
614 msg.msg_namelen = dbuf->addrlen;
615 bufvec.iov_base = dbuf->data;
616 bufvec.iov_len = inq;
617 ret = recvmsg(ufd->fd, &msg, 0);
618 dbuf->addrlen = msg.msg_namelen;
622 if((errno == EINTR) || (errno == EAGAIN))
625 sockerror(ufd->sk, errno);
628 if(msg.msg_flags & MSG_CTRUNC)
629 flog(LOG_DEBUG, "ancillary data was truncated");
632 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
633 * have EOF), but rather an empty packet. I don't know if any
634 * other potential DGRAM protocols might have an EOF
635 * condition, so let's play safe. */
639 if((ufd->type != UFD_SOCK) || !((ufd->d.s.family == AF_INET) || (ufd->d.s.family == AF_INET6)))
646 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
647 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
649 sockqueuedg(ufd->sk, dbuf);
651 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
652 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
653 * how to read the inqueue size on other OSs */
654 if(ufd->type == UFD_SOCK) {
655 if(ioctl(ufd->fd, SIOCINQ, &inq))
657 /* I don't really know what could go wrong here, so let's
658 * assume it's transient. */
659 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), ufd->fd);
663 /* There are perils when trying to use SIOCINQ on files >2GiB... */
671 /* This part could be optimized by telling the kernel to read
672 * directly into ufd->sk->back->buf, but that would be uglier
673 * by not using the socket function interface. */
675 if(ufd->type == UFD_SOCK)
677 bufvec.iov_base = buf;
678 bufvec.iov_len = inq;
679 ret = recvmsg(ufd->fd, &msg, 0);
681 ret = read(ufd->fd, buf, inq);
682 msg.msg_controllen = 0;
688 if((errno == EINTR) || (errno == EAGAIN))
691 sockerror(ufd->sk, errno);
694 if(msg.msg_flags & MSG_CTRUNC)
695 flog(LOG_DEBUG, "ancillary data was truncated");
705 sockqueue(ufd->sk, buf, ret);
710 static void sockflush(struct ufd *ufd)
713 struct dgrambuf *dbuf;
716 if((dgram = ufddgram(ufd)) < 0)
719 dbuf = sockgetdgbuf(ufd->sk);
720 sendto(ufd->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
723 if(ufd->type == UFD_SOCK)
724 ret = send(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
726 ret = write(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize);
728 /* For now, assume transient error, since
729 * the socket is polled for errors */
733 memmove(ufd->sk->buf.s.buf, ((char *)ufd->sk->buf.s.buf) + ret, ufd->sk->buf.s.datasize -= ret);
739 void closesock(struct socket *sk)
742 struct sockaddr_un *un;
744 if((sk->family == AF_UNIX) && !sockgetlocalname(sk, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX))
746 if((sk->state == SOCK_LST) && strchr(un->sun_path, '/'))
748 if(unlink(un->sun_path))
749 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
753 sksetstate(sk, SOCK_STL);
757 size_t sockgetdatalen(struct socket *sk)
764 for(b = sk->buf.d.f; b != NULL; b = b->next)
767 ret = sk->buf.s.datasize;
772 size_t sockqueuesize(struct socket *sk)
774 return(sockgetdatalen(sk->back));
778 * Seriously, I don't know if it's naughty or not to remove
779 * pre-existing Unix sockets.
781 static int rebindunix(struct ufd *ufd, struct sockaddr *name, socklen_t namelen)
783 struct sockaddr_un *un;
786 if((ufd->d.l.family != AF_UNIX) || (name->sa_family != PF_UNIX))
788 un = (struct sockaddr_un *)name;
789 if(stat(un->sun_path, &sb))
791 if(!S_ISSOCK(sb.st_mode))
793 if(unlink(un->sun_path))
795 if(bind(ufd->fd, name, namelen) < 0)
800 void closelport(struct lport *lp)
806 * The difference between netcslisten() and netcslistenlocal() is that
807 * netcslistenlocal() always listens on the local host, instead of
808 * following proxy/passive mode directions. It is suitable for eg. the
809 * UI channel, while the file sharing networks should, naturally, use
810 * netcslisten() instead.
813 struct lport *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
820 /* I don't know if this is actually correct (it probably isn't),
821 * but since, at on least Linux systems, PF_* are specifically
822 * #define'd to their AF_* counterparts, it allows for a severely
823 * smoother implementation. If it breaks something on your
824 * platform, please tell me so.
826 if((fd = socket(name->sa_family, type, 0)) < 0)
828 if(confgetint("net", "reuseaddr")) {
830 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
832 ufd = mkufd(fd, UFD_LISTEN, NULL);
833 ufd->d.l.family = name->sa_family;
834 lp = memset(smalloc(sizeof(*lp)), 0, sizeof(*lp));
837 if((bind(fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(ufd, name, namelen) < 0))) {
841 if(listen(fd, 16) < 0)
851 struct lport *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
853 if(confgetint("net", "mode") == 1)
858 if(confgetint("net", "mode") == 0)
859 return(netcslistenlocal(type, name, namelen, func, data));
864 struct lport *netcstcplisten(int port, int local, void (*func)(struct lport *, struct socket *, void *), void *data)
866 struct sockaddr_in addr;
868 struct sockaddr_in6 addr6;
870 struct lport *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct lport *, struct socket *, void *), void *);
874 csfunc = netcslistenlocal;
876 csfunc = netcslisten;
878 memset(&addr6, 0, sizeof(addr6));
879 addr6.sin6_family = AF_INET6;
880 addr6.sin6_port = htons(port);
881 addr6.sin6_addr = in6addr_any;
882 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
884 if((ret == NULL) && (errno != EAFNOSUPPORT))
887 memset(&addr, 0, sizeof(addr));
888 addr.sin_family = AF_INET;
889 addr.sin_port = htons(port);
890 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
893 struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
898 mode = confgetint("net", "mode");
899 if((mode == 0) || (mode == 1))
901 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
903 if(bind(sk->ufd->fd, name, namelen) < 0)
908 sksetstate(sk, SOCK_EST);
915 struct socket *netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
919 nufd = dupufd(sk->back->ufd);
920 getsock(sk = nufd->sk->back);
921 memcpy(nufd->d.s.remote = smalloc(addrlen), addr, nufd->d.s.remotelen = addrlen);
926 struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
931 mode = confgetint("net", "mode");
932 if((mode == 0) || (mode == 1))
934 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
936 memcpy(sk->ufd->d.s.remote = smalloc(addrlen), addr, sk->ufd->d.s.remotelen = addrlen);
937 sk->back->conncb = func;
938 sk->back->data = data;
939 if(!connect(sk->ufd->fd, addr, addrlen))
941 sksetstate(sk, SOCK_EST);
942 linksock(&cbatch, sk->back);
945 if(errno == EINPROGRESS)
947 sksetstate(sk, SOCK_SYN);
957 static void acceptunix(struct ufd *ufd)
962 #if UNIX_AUTH_STYLE == 1
963 if(setsockopt(ufd->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
964 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", ufd->fd, strerror(errno));
965 #elif UNIX_AUTH_STYLE == 2
966 if(getpeereid(ufd->fd, &ufd->d.s.ucred.uid, &ufd->d.s.ucred.gid) < 0)
968 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", ufd->fd, strerror(errno));
969 ufd->d.s.ucred.uid = -1;
970 ufd->d.s.ucred.gid = -1;
975 static void runbatches(void)
977 struct scons *sc, *nsc;
979 for(sc = cbatch, cbatch = NULL; sc; sc = nsc) {
981 if(sc->s->conncb != NULL)
982 sc->s->conncb(sc->s, 0, sc->s->data);
985 for(sc = rbatch, rbatch = NULL; sc; sc = nsc) {
987 if(sc->s->readcb != NULL)
988 sc->s->readcb(sc->s, sc->s->data);
989 if((sockgetdatalen(sc->s) == 0) && (sc->s->eos == 1)) {
990 if(sc->s->errcb != NULL)
991 sc->s->errcb(sc->s, 0, sc->s->data);
996 for(sc = wbatch, wbatch = NULL; sc; sc = nsc) {
998 if(sc->s->writecb != NULL)
999 sc->s->writecb(sc->s, sc->s->data);
1004 static void cleansocks(void)
1006 struct ufd *ufd, *next;
1008 for(ufd = ufds; ufd != NULL; ufd = next) {
1010 if(ufd->sk && (sockgetdatalen(ufd->sk) == 0)) {
1011 if(ufd->sk->eos == 1) {
1016 if((ufd->sk->refcount == 1) && (ufd->sk->back->refcount == 0)) {
1024 int pollsocks(int timeout)
1029 fd_set rfds, wfds, efds;
1030 struct ufd *ufd, *nufd;
1032 struct sockaddr_storage ss;
1040 for(maxfd = 0, ufd = ufds; ufd != NULL; ufd = ufd->next) {
1044 FD_SET(ufd->fd, &rfds);
1045 if(ufd->sk != NULL) {
1046 if(sockgetdatalen(ufd->sk) > 0)
1047 FD_SET(ufd->fd, &wfds);
1048 else if(ufd->sk->state == SOCK_SYN)
1049 FD_SET(ufd->fd, &wfds);
1051 FD_SET(ufd->fd, &efds);
1055 if(rbatch || wbatch || cbatch)
1057 tv.tv_sec = timeout / 1000;
1058 tv.tv_usec = (timeout % 1000) * 1000;
1059 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
1061 if(errno != EINTR) {
1062 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
1063 /* To avoid CPU hogging in case it's bad, which it
1069 for(ufd = ufds; ufd != NULL; ufd = ufd->next) {
1072 if(ufd->type == UFD_LISTEN) {
1073 if(FD_ISSET(ufd->fd, &rfds)) {
1075 if((newfd = accept(ufd->fd, (struct sockaddr *)&ss, &sslen)) < 0) {
1076 if(ufd->d.l.lp->errcb != NULL)
1077 ufd->d.l.lp->errcb(ufd->d.l.lp, errno, ufd->d.l.lp->data);
1080 nufd = mkufd(newfd, UFD_SOCK, nsk);
1081 nufd->d.s.family = ufd->d.l.family;
1082 sksetstate(nsk, SOCK_EST);
1083 memcpy(nufd->d.s.remote = smalloc(sslen), &ss, sslen);
1084 nufd->d.s.remotelen = sslen;
1085 if(ss.ss_family == PF_UNIX)
1087 if(ufd->d.l.lp->acceptcb != NULL)
1088 ufd->d.l.lp->acceptcb(ufd->d.l.lp, nsk->back, ufd->d.l.lp->data);
1091 if(FD_ISSET(ufd->fd, &efds)) {
1092 retlen = sizeof(ret);
1093 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1094 if(ufd->d.l.lp->errcb != NULL)
1095 ufd->d.l.lp->errcb(ufd->d.l.lp, ret, ufd->d.l.lp->data);
1099 if(ufd->sk->state == SOCK_SYN) {
1100 if(FD_ISSET(ufd->fd, &efds)) {
1101 retlen = sizeof(ret);
1102 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1103 if(ufd->sk->back->conncb != NULL)
1104 ufd->sk->back->conncb(ufd->sk->back, ret, ufd->sk->back->data);
1108 if(FD_ISSET(ufd->fd, &rfds) || FD_ISSET(ufd->fd, &wfds)) {
1109 sksetstate(ufd->sk, SOCK_EST);
1110 linksock(&cbatch, ufd->sk->back);
1112 } else if(ufd->sk->state == SOCK_EST) {
1113 if(FD_ISSET(ufd->fd, &efds)) {
1114 retlen = sizeof(ret);
1115 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1116 sockerror(ufd->sk, ret);
1120 if(FD_ISSET(ufd->fd, &rfds))
1124 if(FD_ISSET(ufd->fd, &wfds))
1134 static struct ufd *getskufd(struct socket *sk)
1137 if(sk->back->ufd != NULL)
1138 return(sk->back->ufd);
1139 if((sk = sk->back->pnext) == NULL)
1145 int socksettos(struct socket *sk, int tos)
1151 if(ufd->type != UFD_SOCK) {
1155 if(ufd->d.s.family == AF_UNIX)
1156 return(0); /* Unix sockets are always perfect. :) */
1157 if(ufd->d.s.family == AF_INET)
1164 case SOCK_TOS_MINCOST:
1167 case SOCK_TOS_MAXREL:
1170 case SOCK_TOS_MAXTP:
1173 case SOCK_TOS_MINDELAY:
1177 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1180 if(setsockopt(ufd->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
1182 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1187 if(ufd->d.s.family == AF_INET6)
1193 case SOCK_TOS_MINCOST:
1194 buf = confgetint("net", "diffserv-mincost");
1196 case SOCK_TOS_MAXREL:
1197 buf = confgetint("net", "diffserv-maxrel");
1199 case SOCK_TOS_MAXTP:
1200 buf = confgetint("net", "diffserv-maxtp");
1202 case SOCK_TOS_MINDELAY:
1203 buf = confgetint("net", "diffserv-mindelay");
1206 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1210 On Linux, the API IPv6 flow label management doesn't seem to
1211 be entirely complete, so I guess this will have to wait.
1213 if(setsockopt(...) < 0)
1215 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1221 flog(LOG_WARNING, "could not set TOS on sock of family %i", ufd->d.s.family);
1228 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1230 struct sockaddr_storage addr;
1234 static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1236 static char buf[80];
1238 struct sockaddr_in *ipv4;
1242 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1245 data->callback(NULL, 0, data->data);
1247 ipv4 = (struct sockaddr_in *)&data->addr;
1248 memcpy(&ipv4->sin_addr, buf, 4);
1249 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1253 data->callback(NULL, 0, data->data);
1259 int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1266 struct resolvedata *rdata;
1267 struct sockaddr_in ipv4;
1273 if((p = strchr(addr, ':')) != NULL)
1278 ipv4.sin_family = AF_INET;
1279 ipv4.sin_port = htons(port);
1280 if(inet_aton(addr, &ipv4.sin_addr))
1282 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1284 sigemptyset(&sigset);
1285 sigaddset(&sigset, SIGCHLD);
1286 sigprocmask(SIG_BLOCK, &sigset, NULL);
1287 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1289 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1294 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1295 for(i = 3; i < FD_SETSIZE; i++)
1300 signal(SIGALRM, SIG_DFL);
1302 if((he = gethostbyname(addr)) == NULL)
1304 write(pfd[1], he->h_addr_list[0], 4);
1308 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1309 rdata = smalloc(sizeof(*rdata));
1311 rdata->callback = callback;
1313 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1314 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1315 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1322 static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1325 struct sockaddr_storage name;
1331 if(getsockname(fd, (struct sockaddr *)&name, &len) < 0)
1333 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
1336 *namebuf = memcpy(smalloc(len), &name, len);
1342 int lstgetlocalname(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1347 return(getlocalname(ufd->fd, namebuf, lenbuf));
1350 int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1355 if(ufd->type != UFD_SOCK) {
1359 return(getlocalname(ufd->fd, namebuf, lenbuf));
1362 static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1364 if(dst->sa_family != src->sa_family)
1366 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1369 switch(src->sa_family)
1372 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1375 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1378 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1383 static int makepublic(struct sockaddr *addr)
1387 struct sockaddr *pname;
1389 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1391 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1396 sethostaddr(addr, pname);
1401 static int getremotename(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1404 struct sockaddr *name;
1406 switch(confgetint("net", "mode")) {
1409 if(!getlocalname(fd, &name, &len)) {
1415 flog(LOG_ERR, "could not get remotely accessible name by any means");
1421 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1427 int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1432 if(ufd->type != UFD_SOCK) {
1440 return(getremotename(ufd->fd, namebuf, lenbuf));
1443 int lstgetremotename(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1448 return(getremotename(ufd->fd, namebuf, lenbuf));
1451 int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1453 struct sockaddr *name1, *name2;
1454 socklen_t len1, len2;
1455 struct ufd *ufd1, *ufd2;
1457 ufd1 = getskufd(sk);
1458 ufd2 = getskufd(sk2);
1459 if((ufd1->type != UFD_SOCK) || (ufd2->type != UFD_SOCK)) {
1463 if(ufd1->d.s.family != ufd2->d.s.family)
1465 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1468 if(getremotename(ufd1->fd, &name1, &len1))
1470 if(getremotename(ufd2->fd, &name2, &len2)) {
1474 sethostaddr(name1, name2);
1481 int lstgetremotename2(struct lport *lp, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1483 struct sockaddr *name1, *name2;
1484 socklen_t len1, len2;
1485 struct ufd *ufd1, *ufd2;
1488 ufd2 = getskufd(sk2);
1489 if(ufd2->type != UFD_SOCK) {
1493 if(ufd1->d.s.family != ufd2->d.s.family)
1495 flog(LOG_ERR, "using lstgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1498 if(getremotename(ufd1->fd, &name1, &len1))
1500 if(getremotename(ufd2->fd, &name2, &len2)) {
1504 sethostaddr(name1, name2);
1511 int getucred(struct socket *sk, uid_t *uid, gid_t *gid)
1516 if(ufd->type != UFD_SOCK) {
1520 if(ufd->d.s.family != AF_UNIX) {
1524 *uid = ufd->d.s.ucred.uid;
1525 *gid = ufd->d.s.ucred.gid;
1529 void sockblock(struct socket *sk, int block)
1534 ufd->ignread = block;
1537 int sockfamily(struct socket *sk)
1542 if(ufd->type != UFD_SOCK) {
1546 return(ufd->d.s.family);
1549 int sockpeeraddr(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1554 if(ufd->type != UFD_SOCK) {
1558 if(ufd->d.s.remote == NULL)
1560 *namebuf = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, ufd->d.s.remotelen);
1562 *lenbuf = ufd->d.s.remotelen;
1566 char *formatsockpeer(struct socket *sk)
1568 struct sockaddr *name;
1572 if(sockpeeraddr(sk, &name, &nlen))
1574 ret = formataddress(name, nlen);
1579 int addreq(struct sockaddr *x, struct sockaddr *y)
1581 struct sockaddr_un *u1, *u2;
1582 struct sockaddr_in *n1, *n2;
1584 struct sockaddr_in6 *s1, *s2;
1587 if(x->sa_family != y->sa_family)
1589 switch(x->sa_family) {
1591 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1592 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1596 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1597 if(n1->sin_port != n2->sin_port)
1599 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1604 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1605 if(s1->sin6_port != s2->sin6_port)
1607 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1615 char *formataddress(struct sockaddr *arg, socklen_t arglen)
1617 struct sockaddr_in *ipv4;
1619 struct sockaddr_in6 *ipv6;
1621 static char *ret = NULL;
1627 switch(arg->sa_family)
1630 ret = sstrdup("Unix socket");
1633 ipv4 = (struct sockaddr_in *)arg;
1634 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1636 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1640 ipv6 = (struct sockaddr_in6 *)arg;
1641 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1643 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
1647 errno = EPFNOSUPPORT;
1656 * It was very nice to use this, but it seems
1657 * to mess things up, so I guess it has to go... :-(
1660 static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1662 struct sockaddr *arg;
1664 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1665 * lowercase letters to 1, so I do this
1667 struct sockaddr_in *ipv4;
1670 arg = *(struct sockaddr **)(args[0]);
1671 arglen = *(socklen_t *)(args[1]);
1672 switch(arg->sa_family)
1675 UNIX = (struct sockaddr_un *)arg;
1676 ret = fprintf(stream, "%s", UNIX->sun_path);
1679 ipv4 = (struct sockaddr_in *)arg;
1680 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1684 errno = EPFNOSUPPORT;
1690 static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1693 argtypes[0] = PA_POINTER;
1695 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1696 * be an int, so I guess this should be
1702 static int init(int hup)
1707 if(register_printf_function('N', formataddress, formataddress_arginfo))
1709 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1717 static void terminate(void)
1725 static struct module me =
1733 .terminate = terminate