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));
219 static struct socket *sockpair(int dgram)
221 struct socket *s1, *s2;
223 s1 = newsock1(dgram);
224 s2 = newsock1(dgram);
231 static void sksetstate(struct socket *sk, int state)
234 sk->back->state = state;
237 static void closeufd(struct ufd *ufd)
244 static void freeufd(struct ufd *ufd)
246 if(ufd->next != NULL)
247 ufd->next->prev = ufd->prev;
248 if(ufd->prev != NULL)
249 ufd->prev->next = ufd->next;
255 if(ufd->type == UFD_SOCK) {
256 if(ufd->d.s.remote != NULL)
257 free(ufd->d.s.remote);
262 static struct ufd *mkufd(int fd, int type, struct socket *sk)
266 ufd = memset(smalloc(sizeof(*ufd)), 0, sizeof(*ufd));
270 getsock(ufd->sk = sk);
273 if(type == UFD_SOCK) {
274 ufd->d.s.ucred.uid = -1;
275 ufd->d.s.ucred.gid = -1;
284 static struct ufd *dupufd(struct ufd *ufd)
290 nsk = sockpair(ufd->sk->dgram);
293 nufd = mkufd(ufd->fd, ufd->type, nsk);
296 if((nufd->fd = dup(ufd->fd)) < 0)
298 flog(LOG_WARNING, "could not dup() fd: %s", strerror(errno));
302 sksetstate(nsk, SOCK_EST);
303 if(ufd->type == UFD_SOCK) {
304 nufd->d.s.family = ufd->d.s.family;
305 nufd->d.s.type = ufd->d.s.type;
306 nufd->d.s.ucred.uid = ufd->d.s.ucred.uid;
307 nufd->d.s.ucred.gid = ufd->d.s.ucred.gid;
308 if(ufd->d.s.remote != NULL)
309 nufd->d.s.remote = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, nufd->d.s.remotelen = ufd->d.s.remotelen);
310 } else if(ufd->type == UFD_LISTEN) {
311 nufd->d.l.family = ufd->d.l.family;
316 static struct socket *mksock(int domain, int type)
322 if((fd = socket(domain, type, 0)) < 0)
324 flog(LOG_CRIT, "could not create socket: %s", strerror(errno));
327 sk = sockpair(type == SOCK_DGRAM);
328 ufd = mkufd(fd, UFD_SOCK, sk);
329 ufd->d.s.family = domain;
330 ufd->d.s.type = type;
331 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
335 struct socket *wrapsock(int fd)
341 ufd = mkufd(fd, UFD_PIPE, sk->back);
342 sksetstate(sk, SOCK_EST);
343 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
347 void getsock(struct socket *sk)
352 static void freesock(struct socket *sk)
354 struct dgrambuf *buf;
357 while((buf = sk->buf.d.f) != NULL) {
358 sk->buf.d.f = buf->next;
362 if(sk->buf.s.buf != NULL)
369 void putsock(struct socket *sk)
373 if(--(sk->refcount) < 0) {
374 flog(LOG_CRIT, "BUG: socket refcount < 0");
377 if((sk->refcount == 0) && (sk->back->refcount == 0)) {
384 static void linksock(struct scons **list, struct socket *sk)
388 for(sc = *list; sc != NULL; sc = sc->n) {
392 sc = smalloc(sizeof(*sc));
401 void sockpushdata(struct socket *sk, void *buf, size_t size)
408 sizebuf(&sk->buf.s.buf, &sk->buf.s.bufsize, sk->buf.s.datasize + size, 1, 1);
409 memmove(sk->buf.s.buf + size, sk->buf.s.buf, sk->buf.s.datasize);
410 memcpy(sk->buf.s.buf, buf, size);
411 sk->buf.s.datasize += size;
412 linksock(&rbatch, sk);
416 /* Read as the preterite of `read' */
417 void sockread(struct socket *sk)
419 if((sockgetdatalen(sk) == 0) && (sk->eos == 1))
420 linksock(&rbatch, sk);
421 linksock(&wbatch, sk->back);
424 void freedgbuf(struct dgrambuf *dg)
433 struct dgrambuf *sockgetdgbuf(struct socket *sk)
435 struct dgrambuf *dbuf;
437 if((dbuf = sk->buf.d.f) == NULL)
439 sk->buf.d.f = dbuf->next;
440 if(dbuf->next == NULL)
447 void *sockgetinbuf(struct socket *sk, size_t *size)
450 struct dgrambuf *dbuf;
453 dbuf = sockgetdgbuf(sk);
459 if((sk->buf.s.buf == NULL) || (sk->buf.s.datasize == 0))
465 *size = sk->buf.s.datasize;
466 sk->buf.s.buf = NULL;
467 sk->buf.s.bufsize = sk->buf.s.datasize = 0;
473 void sockqueue(struct socket *sk, void *data, size_t size)
475 struct dgrambuf *new;
476 struct sockaddr *remote;
481 if(sk->state == SOCK_STL)
484 if(sockpeeraddr(sk, &remote, &remotelen))
486 new = smalloc(sizeof(*new));
488 memcpy(new->data = smalloc(size), data, new->size = size);
490 new->addrlen = remotelen;
491 if(sk->back->buf.d.l == NULL)
493 sk->back->buf.d.l = sk->back->buf.d.f = new;
495 sk->back->buf.d.l->next = new;
496 sk->back->buf.d.l = new;
499 sizebuf(&(sk->back->buf.s.buf), &(sk->back->buf.s.bufsize), sk->back->buf.s.datasize + size, 1, 1);
500 memcpy(sk->back->buf.s.buf + sk->back->buf.s.datasize, data, size);
501 sk->back->buf.s.datasize += size;
503 linksock(&rbatch, sk->back);
506 void sockqueuedg(struct socket *sk, struct dgrambuf *dg)
508 if(sk->state == SOCK_STL) {
513 flog(LOG_ERR, "BUG: sockqueuedg called on non-dgram socket");
518 if(sk->back->buf.d.l == NULL)
520 sk->back->buf.d.l = sk->back->buf.d.f = dg;
522 sk->back->buf.d.l->next = dg;
523 sk->back->buf.d.l = dg;
525 linksock(&rbatch, sk->back);
528 void sockerror(struct socket *sk, int en)
530 sksetstate(sk, SOCK_STL);
531 if(sk->back->errcb != NULL)
532 sk->back->errcb(sk->back, en, sk->back->data);
535 static void recvcmsg(struct ufd *ufd, struct msghdr *msg)
537 struct cmsghdr *cmsg;
539 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
541 #if UNIX_AUTH_STYLE == 1
542 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
545 if(ufd->d.s.ucred.uid == -1)
547 cred = (struct ucred *)CMSG_DATA(cmsg);
548 ufd->d.s.ucred.uid = cred->uid;
549 ufd->d.s.ucred.gid = cred->gid;
556 static int ufddgram(struct ufd *ufd)
560 if(ufd->type == UFD_SOCK) {
561 dgram = ufd->d.s.type == SOCK_DGRAM;
562 } else if(ufd->type == UFD_PIPE) {
565 flog(LOG_ERR, "BUG: calling ufddgram on ufd of bad type %i", ufd->type);
568 if(ufd->sk == NULL) {
569 flog(LOG_ERR, "BUG: calling ufddgram on socketless ufd (type %i)", ufd->type);
572 if(dgram != ufd->sk->dgram) {
573 flog(LOG_ERR, "BUG: ufd/socket dgram value mismatch");
579 static void sockrecv(struct ufd *ufd)
583 struct dgrambuf *dbuf;
589 memset(&msg, 0, sizeof(msg));
590 msg.msg_iov = &bufvec;
592 msg.msg_control = cbuf;
593 msg.msg_controllen = sizeof(cbuf);
594 if((dgram = ufddgram(ufd)) < 0)
597 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
598 if(ioctl(ufd->fd, SIOCINQ, &inq))
600 /* I don't really know what could go wrong here, so let's
601 * assume it's transient. */
602 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), ufd->fd);
608 dbuf = smalloc(sizeof(*dbuf));
609 dbuf->data = smalloc(inq);
610 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
611 msg.msg_name = dbuf->addr;
612 msg.msg_namelen = dbuf->addrlen;
613 bufvec.iov_base = dbuf->data;
614 bufvec.iov_len = inq;
615 ret = recvmsg(ufd->fd, &msg, 0);
616 dbuf->addrlen = msg.msg_namelen;
620 if((errno == EINTR) || (errno == EAGAIN))
623 sockerror(ufd->sk, errno);
626 if(msg.msg_flags & MSG_CTRUNC)
627 flog(LOG_DEBUG, "ancillary data was truncated");
630 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
631 * have EOF), but rather an empty packet. I don't know if any
632 * other potential DGRAM protocols might have an EOF
633 * condition, so let's play safe. */
637 if((ufd->type != UFD_SOCK) || !((ufd->d.s.family == AF_INET) || (ufd->d.s.family == AF_INET6)))
644 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
645 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
647 sockqueuedg(ufd->sk, dbuf);
649 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
650 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
651 * how to read the inqueue size on other OSs */
652 if(ufd->type == UFD_SOCK) {
653 if(ioctl(ufd->fd, SIOCINQ, &inq))
655 /* I don't really know what could go wrong here, so let's
656 * assume it's transient. */
657 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), ufd->fd);
661 /* There are perils when trying to use SIOCINQ on files >2GiB... */
669 /* This part could be optimized by telling the kernel to read
670 * directly into ufd->sk->back->buf, but that would be uglier
671 * by not using the socket function interface. */
673 if(ufd->type == UFD_SOCK)
675 bufvec.iov_base = buf;
676 bufvec.iov_len = inq;
677 ret = recvmsg(ufd->fd, &msg, 0);
679 ret = read(ufd->fd, buf, inq);
680 msg.msg_controllen = 0;
686 if((errno == EINTR) || (errno == EAGAIN))
689 sockerror(ufd->sk, errno);
692 if(msg.msg_flags & MSG_CTRUNC)
693 flog(LOG_DEBUG, "ancillary data was truncated");
703 sockqueue(ufd->sk, buf, ret);
708 static int sockflush(struct ufd *ufd)
711 struct dgrambuf *dbuf;
714 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);
730 memmove(ufd->sk->buf.s.buf, ((char *)ufd->sk->buf.s.buf) + ret, ufd->sk->buf.s.datasize -= ret);
737 void closesock(struct socket *sk)
739 sksetstate(sk, SOCK_STL);
740 if(sk->back->eos == 0)
742 linksock(&rbatch, sk->back);
745 size_t sockgetdatalen(struct socket *sk)
752 for(b = sk->buf.d.f; b != NULL; b = b->next)
755 ret = sk->buf.s.datasize;
760 /* size_t sockqueuesize(struct socket *sk) */
762 /* return(sockgetdatalen(sk->back)); */
765 ssize_t sockqueueleft(struct socket *sk)
767 return(sk->back->maxbuf - sockgetdatalen(sk->back));
771 * Seriously, I don't know if it's naughty or not to remove
772 * pre-existing Unix sockets.
774 static int rebindunix(struct ufd *ufd, struct sockaddr *name, socklen_t namelen)
776 struct sockaddr_un *un;
779 if((ufd->d.l.family != AF_UNIX) || (name->sa_family != PF_UNIX))
781 un = (struct sockaddr_un *)name;
782 if(stat(un->sun_path, &sb))
784 if(!S_ISSOCK(sb.st_mode))
786 if(unlink(un->sun_path))
788 if(bind(ufd->fd, name, namelen) < 0)
793 void closelport(struct lport *lp)
796 struct sockaddr_un *un;
799 if((ufd->d.l.family == AF_UNIX) && !getlocalname(ufd->fd, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX) && strchr(un->sun_path, '/')) {
800 if(unlink(un->sun_path))
801 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
807 * The difference between netcslisten() and netcslistenlocal() is that
808 * netcslistenlocal() always listens on the local host, instead of
809 * following proxy/passive mode directions. It is suitable for eg. the
810 * UI channel, while the file sharing networks should, naturally, use
811 * netcslisten() instead.
814 struct lport *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
821 /* I don't know if this is actually correct (it probably isn't),
822 * but since, at on least Linux systems, PF_* are specifically
823 * #define'd to their AF_* counterparts, it allows for a severely
824 * smoother implementation. If it breaks something on your
825 * platform, please tell me so.
827 if((fd = socket(name->sa_family, type, 0)) < 0)
829 if(confgetint("net", "reuseaddr")) {
831 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
833 ufd = mkufd(fd, UFD_LISTEN, NULL);
834 ufd->d.l.family = name->sa_family;
835 lp = memset(smalloc(sizeof(*lp)), 0, sizeof(*lp));
838 if((bind(fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(ufd, name, namelen) < 0))) {
842 if(listen(fd, 16) < 0)
852 struct lport *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
854 if(confgetint("net", "mode") == 1)
859 if(confgetint("net", "mode") == 0)
860 return(netcslistenlocal(type, name, namelen, func, data));
865 struct lport *netcstcplisten(int port, int local, void (*func)(struct lport *, struct socket *, void *), void *data)
867 struct sockaddr_in addr;
869 struct sockaddr_in6 addr6;
871 struct lport *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct lport *, struct socket *, void *), void *);
875 csfunc = netcslistenlocal;
877 csfunc = netcslisten;
879 memset(&addr6, 0, sizeof(addr6));
880 addr6.sin6_family = AF_INET6;
881 addr6.sin6_port = htons(port);
882 addr6.sin6_addr = in6addr_any;
883 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
885 if((ret == NULL) && (errno != EAFNOSUPPORT))
888 memset(&addr, 0, sizeof(addr));
889 addr.sin_family = AF_INET;
890 addr.sin_port = htons(port);
891 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
894 struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
899 mode = confgetint("net", "mode");
900 if((mode == 0) || (mode == 1))
902 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
904 if(bind(sk->ufd->fd, name, namelen) < 0)
909 sksetstate(sk, SOCK_EST);
916 struct socket *netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
920 nufd = dupufd(sk->back->ufd);
921 getsock(sk = nufd->sk->back);
922 memcpy(nufd->d.s.remote = smalloc(addrlen), addr, nufd->d.s.remotelen = addrlen);
927 struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
932 mode = confgetint("net", "mode");
933 if((mode == 0) || (mode == 1))
935 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
937 memcpy(sk->ufd->d.s.remote = smalloc(addrlen), addr, sk->ufd->d.s.remotelen = addrlen);
938 sk->back->conncb = func;
939 sk->back->data = data;
940 if(!connect(sk->ufd->fd, addr, addrlen))
942 sksetstate(sk, SOCK_EST);
943 linksock(&cbatch, sk->back);
946 if(errno == EINPROGRESS)
948 sksetstate(sk, SOCK_SYN);
958 static void acceptunix(struct ufd *ufd)
963 #if UNIX_AUTH_STYLE == 1
964 if(setsockopt(ufd->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
965 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", ufd->fd, strerror(errno));
966 #elif UNIX_AUTH_STYLE == 2
967 if(getpeereid(ufd->fd, &ufd->d.s.ucred.uid, &ufd->d.s.ucred.gid) < 0)
969 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", ufd->fd, strerror(errno));
970 ufd->d.s.ucred.uid = -1;
971 ufd->d.s.ucred.gid = -1;
976 static void runbatches(void)
978 struct scons *sc, *nsc;
980 for(sc = cbatch, cbatch = NULL; sc; sc = nsc) {
982 if(sc->s->conncb != NULL)
983 sc->s->conncb(sc->s, 0, sc->s->data);
987 for(sc = rbatch, rbatch = NULL; sc; sc = nsc) {
989 if(sc->s->readcb != NULL)
990 sc->s->readcb(sc->s, sc->s->data);
991 if((sockgetdatalen(sc->s) == 0) && (sc->s->eos == 1)) {
992 if(sc->s->errcb != NULL)
993 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);
1008 static void cleansocks(void)
1010 struct ufd *ufd, *next;
1012 for(ufd = ufds; ufd != NULL; ufd = next) {
1014 if(ufd->sk && ((ufd->fd < 0) || (sockgetdatalen(ufd->sk) == 0))) {
1015 if(ufd->sk->eos == 1) {
1020 if((ufd->sk->refcount == 1) && (ufd->sk->back->refcount == 0)) {
1028 int pollsocks(int timeout)
1033 fd_set rfds, wfds, efds;
1034 struct ufd *ufd, *nufd;
1036 struct sockaddr_storage ss;
1044 for(maxfd = 0, ufd = ufds; ufd != NULL; ufd = ufd->next) {
1047 if(!ufd->ignread && ((ufd->sk == NULL) || (sockqueueleft(ufd->sk) > 0)))
1048 FD_SET(ufd->fd, &rfds);
1049 if(ufd->sk != NULL) {
1050 if(sockgetdatalen(ufd->sk) > 0)
1051 FD_SET(ufd->fd, &wfds);
1052 else if(ufd->sk->state == SOCK_SYN)
1053 FD_SET(ufd->fd, &wfds);
1055 FD_SET(ufd->fd, &efds);
1059 if(rbatch || wbatch || cbatch)
1061 tv.tv_sec = timeout / 1000;
1062 tv.tv_usec = (timeout % 1000) * 1000;
1063 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
1065 if(errno != EINTR) {
1066 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
1067 /* To avoid CPU hogging in case it's bad, which it
1073 for(ufd = ufds; ufd != NULL; ufd = ufd->next) {
1076 if(ufd->type == UFD_LISTEN) {
1077 if(FD_ISSET(ufd->fd, &rfds)) {
1079 if((newfd = accept(ufd->fd, (struct sockaddr *)&ss, &sslen)) < 0) {
1080 if(ufd->d.l.lp->errcb != NULL)
1081 ufd->d.l.lp->errcb(ufd->d.l.lp, errno, ufd->d.l.lp->data);
1084 nufd = mkufd(newfd, UFD_SOCK, nsk);
1085 nufd->d.s.family = ufd->d.l.family;
1086 sksetstate(nsk, SOCK_EST);
1087 memcpy(nufd->d.s.remote = smalloc(sslen), &ss, sslen);
1088 nufd->d.s.remotelen = sslen;
1089 if(ss.ss_family == PF_UNIX)
1091 if(ufd->d.l.lp->acceptcb != NULL)
1092 ufd->d.l.lp->acceptcb(ufd->d.l.lp, nsk->back, ufd->d.l.lp->data);
1095 if(FD_ISSET(ufd->fd, &efds)) {
1096 retlen = sizeof(ret);
1097 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1098 if(ufd->d.l.lp->errcb != NULL)
1099 ufd->d.l.lp->errcb(ufd->d.l.lp, ret, ufd->d.l.lp->data);
1103 if(ufd->sk->state == SOCK_SYN) {
1104 if(FD_ISSET(ufd->fd, &efds)) {
1105 retlen = sizeof(ret);
1106 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1107 if(ufd->sk->back->conncb != NULL)
1108 ufd->sk->back->conncb(ufd->sk->back, ret, ufd->sk->back->data);
1112 if(FD_ISSET(ufd->fd, &rfds) || FD_ISSET(ufd->fd, &wfds)) {
1113 sksetstate(ufd->sk, SOCK_EST);
1114 linksock(&cbatch, ufd->sk->back);
1116 } else if(ufd->sk->state == SOCK_EST) {
1117 if(FD_ISSET(ufd->fd, &efds)) {
1118 retlen = sizeof(ret);
1119 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1120 sockerror(ufd->sk, ret);
1124 if(FD_ISSET(ufd->fd, &rfds))
1128 if(FD_ISSET(ufd->fd, &wfds)) {
1129 if(sockflush(ufd)) {
1130 sockerror(ufd->sk, errno);
1143 static struct ufd *getskufd(struct socket *sk)
1146 if(sk->back->ufd != NULL)
1147 return(sk->back->ufd);
1148 if((sk = sk->back->pnext) == NULL)
1154 int socksettos(struct socket *sk, int tos)
1160 if(ufd->type != UFD_SOCK) {
1164 if(ufd->d.s.family == AF_UNIX)
1165 return(0); /* Unix sockets are always perfect. :) */
1166 if(ufd->d.s.family == AF_INET)
1173 case SOCK_TOS_MINCOST:
1176 case SOCK_TOS_MAXREL:
1179 case SOCK_TOS_MAXTP:
1182 case SOCK_TOS_MINDELAY:
1186 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1189 if(setsockopt(ufd->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
1191 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1196 if(ufd->d.s.family == AF_INET6)
1202 case SOCK_TOS_MINCOST:
1203 buf = confgetint("net", "diffserv-mincost");
1205 case SOCK_TOS_MAXREL:
1206 buf = confgetint("net", "diffserv-maxrel");
1208 case SOCK_TOS_MAXTP:
1209 buf = confgetint("net", "diffserv-maxtp");
1211 case SOCK_TOS_MINDELAY:
1212 buf = confgetint("net", "diffserv-mindelay");
1215 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1219 On Linux, the API IPv6 flow label management doesn't seem to
1220 be entirely complete, so I guess this will have to wait.
1222 if(setsockopt(...) < 0)
1224 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1230 flog(LOG_WARNING, "could not set TOS on sock of family %i", ufd->d.s.family);
1237 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1239 struct sockaddr_storage addr;
1243 static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1245 static char buf[80];
1247 struct sockaddr_in *ipv4;
1251 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1254 data->callback(NULL, 0, data->data);
1256 ipv4 = (struct sockaddr_in *)&data->addr;
1257 memcpy(&ipv4->sin_addr, buf, 4);
1258 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1262 data->callback(NULL, 0, data->data);
1268 int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1275 struct resolvedata *rdata;
1276 struct sockaddr_in ipv4;
1282 if((p = strchr(addr, ':')) != NULL)
1287 ipv4.sin_family = AF_INET;
1288 ipv4.sin_port = htons(port);
1289 if(inet_aton(addr, &ipv4.sin_addr))
1291 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1293 sigemptyset(&sigset);
1294 sigaddset(&sigset, SIGCHLD);
1295 sigprocmask(SIG_BLOCK, &sigset, NULL);
1296 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1298 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1303 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1304 for(i = 3; i < FD_SETSIZE; i++)
1309 signal(SIGALRM, SIG_DFL);
1311 if((he = gethostbyname(addr)) == NULL)
1313 write(pfd[1], he->h_addr_list[0], 4);
1317 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1318 rdata = smalloc(sizeof(*rdata));
1320 rdata->callback = callback;
1322 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1323 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1324 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1331 static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1334 struct sockaddr_storage name;
1340 if(getsockname(fd, (struct sockaddr *)&name, &len) < 0)
1342 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
1345 *namebuf = memcpy(smalloc(len), &name, len);
1351 int lstgetlocalname(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1356 return(getlocalname(ufd->fd, namebuf, lenbuf));
1359 int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1364 if(ufd->type != UFD_SOCK) {
1368 return(getlocalname(ufd->fd, namebuf, lenbuf));
1371 static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1373 if(dst->sa_family != src->sa_family)
1375 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1378 switch(src->sa_family)
1381 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1384 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1387 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1392 static int makepublic(struct sockaddr *addr)
1396 struct sockaddr *pname;
1398 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1400 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1405 sethostaddr(addr, pname);
1410 static int getremotename(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1413 struct sockaddr *name;
1415 switch(confgetint("net", "mode")) {
1418 if(!getlocalname(fd, &name, &len)) {
1424 flog(LOG_ERR, "could not get remotely accessible name by any means");
1430 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1436 int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1441 if(ufd->type != UFD_SOCK) {
1449 return(getremotename(ufd->fd, namebuf, lenbuf));
1452 int lstgetremotename(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1457 return(getremotename(ufd->fd, namebuf, lenbuf));
1460 int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1462 struct sockaddr *name1, *name2;
1463 socklen_t len1, len2;
1464 struct ufd *ufd1, *ufd2;
1466 ufd1 = getskufd(sk);
1467 ufd2 = getskufd(sk2);
1468 if((ufd1->type != UFD_SOCK) || (ufd2->type != UFD_SOCK)) {
1472 if(ufd1->d.s.family != ufd2->d.s.family)
1474 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1477 if(getremotename(ufd1->fd, &name1, &len1))
1479 if(getremotename(ufd2->fd, &name2, &len2)) {
1483 sethostaddr(name1, name2);
1490 int lstgetremotename2(struct lport *lp, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1492 struct sockaddr *name1, *name2;
1493 socklen_t len1, len2;
1494 struct ufd *ufd1, *ufd2;
1497 ufd2 = getskufd(sk2);
1498 if(ufd2->type != UFD_SOCK) {
1502 if(ufd1->d.l.family != ufd2->d.s.family)
1504 flog(LOG_ERR, "using lstgetremotename2 with sockets of differing family: %i %i", ufd1->d.l.family, ufd2->d.s.family);
1507 if(getremotename(ufd1->fd, &name1, &len1))
1509 if(getremotename(ufd2->fd, &name2, &len2)) {
1513 sethostaddr(name1, name2);
1520 int getucred(struct socket *sk, uid_t *uid, gid_t *gid)
1525 if(ufd->type != UFD_SOCK) {
1529 if(ufd->d.s.family != AF_UNIX) {
1533 *uid = ufd->d.s.ucred.uid;
1534 *gid = ufd->d.s.ucred.gid;
1538 /* void sockblock(struct socket *sk, int block) */
1540 /* struct ufd *ufd; */
1542 /* ufd = getskufd(sk); */
1543 /* ufd->ignread = block; */
1546 int sockfamily(struct socket *sk)
1551 if(ufd->type != UFD_SOCK) {
1555 return(ufd->d.s.family);
1558 int sockpeeraddr(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1563 if(ufd->type != UFD_SOCK) {
1567 if(ufd->d.s.remote == NULL)
1569 *namebuf = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, ufd->d.s.remotelen);
1571 *lenbuf = ufd->d.s.remotelen;
1575 char *formatsockpeer(struct socket *sk)
1577 struct sockaddr *name;
1581 if(sockpeeraddr(sk, &name, &nlen))
1583 ret = formataddress(name, nlen);
1588 int addreq(struct sockaddr *x, struct sockaddr *y)
1590 struct sockaddr_un *u1, *u2;
1591 struct sockaddr_in *n1, *n2;
1593 struct sockaddr_in6 *s1, *s2;
1596 if(x->sa_family != y->sa_family)
1598 switch(x->sa_family) {
1600 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1601 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1605 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1606 if(n1->sin_port != n2->sin_port)
1608 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1613 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1614 if(s1->sin6_port != s2->sin6_port)
1616 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1624 char *formataddress(struct sockaddr *arg, socklen_t arglen)
1626 struct sockaddr_in *ipv4;
1628 struct sockaddr_in6 *ipv6;
1630 static char *ret = NULL;
1636 switch(arg->sa_family)
1639 ret = sstrdup("Unix socket");
1642 ipv4 = (struct sockaddr_in *)arg;
1643 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1645 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1649 ipv6 = (struct sockaddr_in6 *)arg;
1650 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1652 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
1656 errno = EPFNOSUPPORT;
1665 * It was very nice to use this, but it seems
1666 * to mess things up, so I guess it has to go... :-(
1669 static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1671 struct sockaddr *arg;
1673 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1674 * lowercase letters to 1, so I do this
1676 struct sockaddr_in *ipv4;
1679 arg = *(struct sockaddr **)(args[0]);
1680 arglen = *(socklen_t *)(args[1]);
1681 switch(arg->sa_family)
1684 UNIX = (struct sockaddr_un *)arg;
1685 ret = fprintf(stream, "%s", UNIX->sun_path);
1688 ipv4 = (struct sockaddr_in *)arg;
1689 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1693 errno = EPFNOSUPPORT;
1699 static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1702 argtypes[0] = PA_POINTER;
1704 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1705 * be an int, so I guess this should be
1711 static int init(int hup)
1716 if(register_printf_function('N', formataddress, formataddress_arginfo))
1718 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1726 static void terminate(void)
1734 static struct module me =
1742 .terminate = terminate