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 struct socket *netsockpipe(void)
242 sksetstate(sk, SOCK_EST);
246 static void closeufd(struct ufd *ufd)
253 static void freeufd(struct ufd *ufd)
255 if(ufd->next != NULL)
256 ufd->next->prev = ufd->prev;
257 if(ufd->prev != NULL)
258 ufd->prev->next = ufd->next;
264 if(ufd->type == UFD_SOCK) {
265 if(ufd->d.s.remote != NULL)
266 free(ufd->d.s.remote);
271 static struct ufd *mkufd(int fd, int type, struct socket *sk)
275 ufd = memset(smalloc(sizeof(*ufd)), 0, sizeof(*ufd));
279 getsock(ufd->sk = sk);
282 if(type == UFD_SOCK) {
283 ufd->d.s.ucred.uid = -1;
284 ufd->d.s.ucred.gid = -1;
293 static struct ufd *dupufd(struct ufd *ufd)
299 nsk = sockpair(ufd->sk->dgram);
302 nufd = mkufd(ufd->fd, ufd->type, nsk);
305 if((nufd->fd = dup(ufd->fd)) < 0)
307 flog(LOG_WARNING, "could not dup() fd: %s", strerror(errno));
311 sksetstate(nsk, SOCK_EST);
312 if(ufd->type == UFD_SOCK) {
313 nufd->d.s.family = ufd->d.s.family;
314 nufd->d.s.type = ufd->d.s.type;
315 nufd->d.s.ucred.uid = ufd->d.s.ucred.uid;
316 nufd->d.s.ucred.gid = ufd->d.s.ucred.gid;
317 if(ufd->d.s.remote != NULL)
318 nufd->d.s.remote = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, nufd->d.s.remotelen = ufd->d.s.remotelen);
319 } else if(ufd->type == UFD_LISTEN) {
320 nufd->d.l.family = ufd->d.l.family;
325 static struct socket *mksock(int domain, int type)
331 if((fd = socket(domain, type, 0)) < 0)
333 flog(LOG_CRIT, "could not create socket: %s", strerror(errno));
336 sk = sockpair(type == SOCK_DGRAM);
337 ufd = mkufd(fd, UFD_SOCK, sk);
338 ufd->d.s.family = domain;
339 ufd->d.s.type = type;
340 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
344 struct socket *wrapsock(int fd)
350 ufd = mkufd(fd, UFD_PIPE, sk->back);
351 sksetstate(sk, SOCK_EST);
352 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
356 void getsock(struct socket *sk)
361 static void freesock(struct socket *sk)
363 struct dgrambuf *buf;
366 while((buf = sk->buf.d.f) != NULL) {
367 sk->buf.d.f = buf->next;
371 if(sk->buf.s.buf != NULL)
378 void putsock(struct socket *sk)
382 if(--(sk->refcount) < 0) {
383 flog(LOG_CRIT, "BUG: socket refcount < 0");
386 if((sk->refcount == 0) && (sk->back->refcount == 0)) {
393 void quitsock(struct socket *sk)
401 static void linksock(struct scons **list, struct socket *sk)
405 for(sc = *list; sc != NULL; sc = sc->n) {
409 sc = smalloc(sizeof(*sc));
418 void sockpushdata(struct socket *sk, void *buf, size_t size)
425 sizebuf(&sk->buf.s.buf, &sk->buf.s.bufsize, sk->buf.s.datasize + size, 1, 1);
426 memmove(sk->buf.s.buf + size, sk->buf.s.buf, sk->buf.s.datasize);
427 memcpy(sk->buf.s.buf, buf, size);
428 sk->buf.s.datasize += size;
429 linksock(&rbatch, sk);
433 /* Read as the preterite of `read' */
434 void sockread(struct socket *sk)
436 if((sockgetdatalen(sk) == 0) && (sk->eos == 1))
437 linksock(&rbatch, sk);
438 linksock(&wbatch, sk->back);
441 void freedgbuf(struct dgrambuf *dg)
450 struct dgrambuf *sockgetdgbuf(struct socket *sk)
452 struct dgrambuf *dbuf;
454 if((dbuf = sk->buf.d.f) == NULL)
456 sk->buf.d.f = dbuf->next;
457 if(dbuf->next == NULL)
464 void *sockgetinbuf(struct socket *sk, size_t *size)
467 struct dgrambuf *dbuf;
470 dbuf = sockgetdgbuf(sk);
476 if((sk->buf.s.buf == NULL) || (sk->buf.s.datasize == 0))
482 *size = sk->buf.s.datasize;
483 sk->buf.s.buf = NULL;
484 sk->buf.s.bufsize = sk->buf.s.datasize = 0;
490 void sockqueue(struct socket *sk, void *data, size_t size)
492 struct dgrambuf *new;
493 struct sockaddr *remote;
498 if(sk->state == SOCK_STL)
501 if(sockpeeraddr(sk, &remote, &remotelen))
503 new = smalloc(sizeof(*new));
505 memcpy(new->data = smalloc(size), data, new->size = size);
507 new->addrlen = remotelen;
508 if(sk->back->buf.d.l == NULL)
510 sk->back->buf.d.l = sk->back->buf.d.f = new;
512 sk->back->buf.d.l->next = new;
513 sk->back->buf.d.l = new;
516 sizebuf(&(sk->back->buf.s.buf), &(sk->back->buf.s.bufsize), sk->back->buf.s.datasize + size, 1, 1);
517 memcpy(sk->back->buf.s.buf + sk->back->buf.s.datasize, data, size);
518 sk->back->buf.s.datasize += size;
520 linksock(&rbatch, sk->back);
523 void sockqueuedg(struct socket *sk, struct dgrambuf *dg)
525 if(sk->state == SOCK_STL) {
530 flog(LOG_ERR, "BUG: sockqueuedg called on non-dgram socket");
535 if(sk->back->buf.d.l == NULL)
537 sk->back->buf.d.l = sk->back->buf.d.f = dg;
539 sk->back->buf.d.l->next = dg;
540 sk->back->buf.d.l = dg;
542 linksock(&rbatch, sk->back);
545 void sockerror(struct socket *sk, int en)
547 sksetstate(sk, SOCK_STL);
548 if(sk->back->errcb != NULL)
549 sk->back->errcb(sk->back, en, sk->back->data);
552 static void recvcmsg(struct ufd *ufd, struct msghdr *msg)
554 struct cmsghdr *cmsg;
556 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
558 #if UNIX_AUTH_STYLE == 1
559 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
562 if(ufd->d.s.ucred.uid == -1)
564 cred = (struct ucred *)CMSG_DATA(cmsg);
565 ufd->d.s.ucred.uid = cred->uid;
566 ufd->d.s.ucred.gid = cred->gid;
573 static int ufddgram(struct ufd *ufd)
577 if(ufd->type == UFD_SOCK) {
578 dgram = ufd->d.s.type == SOCK_DGRAM;
579 } else if(ufd->type == UFD_PIPE) {
582 flog(LOG_ERR, "BUG: calling ufddgram on ufd of bad type %i", ufd->type);
585 if(ufd->sk == NULL) {
586 flog(LOG_ERR, "BUG: calling ufddgram on socketless ufd (type %i)", ufd->type);
589 if(dgram != ufd->sk->dgram) {
590 flog(LOG_ERR, "BUG: ufd/socket dgram value mismatch");
596 static void sockrecv(struct ufd *ufd)
600 struct dgrambuf *dbuf;
606 memset(&msg, 0, sizeof(msg));
607 msg.msg_iov = &bufvec;
609 msg.msg_control = cbuf;
610 msg.msg_controllen = sizeof(cbuf);
611 if((dgram = ufddgram(ufd)) < 0)
614 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
615 if(ioctl(ufd->fd, SIOCINQ, &inq))
617 /* I don't really know what could go wrong here, so let's
618 * assume it's transient. */
619 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), ufd->fd);
625 dbuf = smalloc(sizeof(*dbuf));
626 dbuf->data = smalloc(inq);
627 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
628 msg.msg_name = dbuf->addr;
629 msg.msg_namelen = dbuf->addrlen;
630 bufvec.iov_base = dbuf->data;
631 bufvec.iov_len = inq;
632 ret = recvmsg(ufd->fd, &msg, 0);
633 dbuf->addrlen = msg.msg_namelen;
637 if((errno == EINTR) || (errno == EAGAIN))
640 sockerror(ufd->sk, errno);
643 if(msg.msg_flags & MSG_CTRUNC)
644 flog(LOG_DEBUG, "ancillary data was truncated");
647 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
648 * have EOF), but rather an empty packet. I don't know if any
649 * other potential DGRAM protocols might have an EOF
650 * condition, so let's play safe. */
654 if((ufd->type != UFD_SOCK) || !((ufd->d.s.family == AF_INET) || (ufd->d.s.family == AF_INET6)))
661 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
662 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
664 sockqueuedg(ufd->sk, dbuf);
666 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
667 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
668 * how to read the inqueue size on other OSs */
669 if(ufd->type == UFD_SOCK) {
670 if(ioctl(ufd->fd, SIOCINQ, &inq))
672 /* I don't really know what could go wrong here, so let's
673 * assume it's transient. */
674 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), ufd->fd);
678 /* There are perils when trying to use SIOCINQ on files >2GiB... */
686 /* This part could be optimized by telling the kernel to read
687 * directly into ufd->sk->back->buf, but that would be uglier
688 * by not using the socket function interface. */
690 if(ufd->type == UFD_SOCK)
692 bufvec.iov_base = buf;
693 bufvec.iov_len = inq;
694 ret = recvmsg(ufd->fd, &msg, 0);
696 ret = read(ufd->fd, buf, inq);
697 msg.msg_controllen = 0;
703 if((errno == EINTR) || (errno == EAGAIN))
706 sockerror(ufd->sk, errno);
709 if(msg.msg_flags & MSG_CTRUNC)
710 flog(LOG_DEBUG, "ancillary data was truncated");
720 sockqueue(ufd->sk, buf, ret);
725 static int sockflush(struct ufd *ufd)
728 struct dgrambuf *dbuf;
731 if((dgram = ufddgram(ufd)) < 0) {
736 dbuf = sockgetdgbuf(ufd->sk);
737 sendto(ufd->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
740 if(ufd->type == UFD_SOCK)
741 ret = send(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
743 ret = write(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize);
747 memmove(ufd->sk->buf.s.buf, ((char *)ufd->sk->buf.s.buf) + ret, ufd->sk->buf.s.datasize -= ret);
754 void closesock(struct socket *sk)
756 sksetstate(sk, SOCK_STL);
757 if(sk->back->eos == 0)
759 linksock(&rbatch, sk->back);
762 size_t sockgetdatalen(struct socket *sk)
769 for(b = sk->buf.d.f; b != NULL; b = b->next)
772 ret = sk->buf.s.datasize;
777 /* size_t sockqueuesize(struct socket *sk) */
779 /* return(sockgetdatalen(sk->back)); */
782 size_t socktqueuesize(struct socket *sk)
788 ret += sockgetdatalen(sk->back);
789 if((sk = sk->back->pnext) == NULL)
794 ssize_t sockqueueleft(struct socket *sk)
796 return(sk->back->maxbuf - sockgetdatalen(sk->back));
800 * Seriously, I don't know if it's naughty or not to remove
801 * pre-existing Unix sockets.
803 static int rebindunix(struct ufd *ufd, struct sockaddr *name, socklen_t namelen)
805 struct sockaddr_un *un;
808 if((ufd->d.l.family != AF_UNIX) || (name->sa_family != PF_UNIX))
810 un = (struct sockaddr_un *)name;
811 if(stat(un->sun_path, &sb))
813 if(!S_ISSOCK(sb.st_mode))
815 if(unlink(un->sun_path))
817 if(bind(ufd->fd, name, namelen) < 0)
822 void closelport(struct lport *lp)
825 struct sockaddr_un *un;
828 if((ufd->d.l.family == AF_UNIX) && !getlocalname(ufd->fd, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX) && strchr(un->sun_path, '/')) {
829 if(unlink(un->sun_path))
830 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
836 * The difference between netcslisten() and netcslistenlocal() is that
837 * netcslistenlocal() always listens on the local host, instead of
838 * following proxy/passive mode directions. It is suitable for eg. the
839 * UI channel, while the file sharing networks should, naturally, use
840 * netcslisten() instead.
843 struct lport *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
850 /* I don't know if this is actually correct (it probably isn't),
851 * but since, at on least Linux systems, PF_* are specifically
852 * #define'd to their AF_* counterparts, it allows for a severely
853 * smoother implementation. If it breaks something on your
854 * platform, please tell me so.
856 if((fd = socket(name->sa_family, type, 0)) < 0)
858 if(confgetint("net", "reuseaddr")) {
860 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
862 ufd = mkufd(fd, UFD_LISTEN, NULL);
863 ufd->d.l.family = name->sa_family;
864 lp = memset(smalloc(sizeof(*lp)), 0, sizeof(*lp));
867 if((bind(fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(ufd, name, namelen) < 0))) {
871 if(listen(fd, 16) < 0)
881 struct lport *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
883 if(confgetint("net", "mode") == 1)
888 if(confgetint("net", "mode") == 0)
889 return(netcslistenlocal(type, name, namelen, func, data));
894 struct lport *netcstcplisten(int port, int local, void (*func)(struct lport *, struct socket *, void *), void *data)
896 struct sockaddr_in addr;
898 struct sockaddr_in6 addr6;
900 struct lport *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct lport *, struct socket *, void *), void *);
904 csfunc = netcslistenlocal;
906 csfunc = netcslisten;
908 memset(&addr6, 0, sizeof(addr6));
909 addr6.sin6_family = AF_INET6;
910 addr6.sin6_port = htons(port);
911 addr6.sin6_addr = in6addr_any;
912 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
914 if((ret == NULL) && (errno != EAFNOSUPPORT))
917 memset(&addr, 0, sizeof(addr));
918 addr.sin_family = AF_INET;
919 addr.sin_port = htons(port);
920 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
923 struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
928 mode = confgetint("net", "mode");
929 if((mode == 0) || (mode == 1))
931 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
933 if(bind(sk->ufd->fd, name, namelen) < 0)
938 sksetstate(sk, SOCK_EST);
945 struct socket *netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
949 nufd = dupufd(sk->back->ufd);
950 getsock(sk = nufd->sk->back);
951 memcpy(nufd->d.s.remote = smalloc(addrlen), addr, nufd->d.s.remotelen = addrlen);
956 struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
961 mode = confgetint("net", "mode");
962 if((mode == 0) || (mode == 1))
964 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
966 memcpy(sk->ufd->d.s.remote = smalloc(addrlen), addr, sk->ufd->d.s.remotelen = addrlen);
967 sk->back->conncb = func;
968 sk->back->data = data;
969 if(!connect(sk->ufd->fd, addr, addrlen))
971 sksetstate(sk, SOCK_EST);
972 linksock(&cbatch, sk->back);
975 if(errno == EINPROGRESS)
977 sksetstate(sk, SOCK_SYN);
987 static void acceptunix(struct ufd *ufd)
992 #if UNIX_AUTH_STYLE == 1
993 if(setsockopt(ufd->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
994 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", ufd->fd, strerror(errno));
995 #elif UNIX_AUTH_STYLE == 2
996 if(getpeereid(ufd->fd, &ufd->d.s.ucred.uid, &ufd->d.s.ucred.gid) < 0)
998 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", ufd->fd, strerror(errno));
999 ufd->d.s.ucred.uid = -1;
1000 ufd->d.s.ucred.gid = -1;
1005 static void runbatches(void)
1007 struct scons *sc, *nsc;
1009 for(sc = cbatch, cbatch = NULL; sc; sc = nsc) {
1011 if(sc->s->conncb != NULL)
1012 sc->s->conncb(sc->s, 0, sc->s->data);
1016 for(sc = rbatch, rbatch = NULL; sc; sc = nsc) {
1018 if(sc->s->readcb != NULL)
1019 sc->s->readcb(sc->s, sc->s->data);
1020 if((sockgetdatalen(sc->s) == 0) && (sc->s->eos == 1)) {
1021 if(sc->s->errcb != NULL)
1022 sc->s->errcb(sc->s, 0, sc->s->data);
1028 for(sc = wbatch, wbatch = NULL; sc; sc = nsc) {
1030 if(sc->s->writecb != NULL)
1031 sc->s->writecb(sc->s, sc->s->data);
1037 static void cleansocks(void)
1039 struct ufd *ufd, *next;
1041 for(ufd = ufds; ufd != NULL; ufd = next) {
1043 if(ufd->sk && ((ufd->fd < 0) || (sockgetdatalen(ufd->sk) == 0))) {
1044 if(ufd->sk->eos == 1) {
1049 if((ufd->sk->refcount == 1) && (ufd->sk->back->refcount == 0)) {
1057 int pollsocks(int timeout)
1062 fd_set rfds, wfds, efds;
1063 struct ufd *ufd, *nufd;
1065 struct sockaddr_storage ss;
1073 for(maxfd = 0, ufd = ufds; ufd != NULL; ufd = ufd->next) {
1076 if(!ufd->ignread && ((ufd->sk == NULL) || (sockqueueleft(ufd->sk) > 0)))
1077 FD_SET(ufd->fd, &rfds);
1078 if(ufd->sk != NULL) {
1079 if(sockgetdatalen(ufd->sk) > 0)
1080 FD_SET(ufd->fd, &wfds);
1081 else if(ufd->sk->state == SOCK_SYN)
1082 FD_SET(ufd->fd, &wfds);
1084 FD_SET(ufd->fd, &efds);
1088 if(rbatch || wbatch || cbatch)
1090 tv.tv_sec = timeout / 1000;
1091 tv.tv_usec = (timeout % 1000) * 1000;
1092 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
1094 if(errno != EINTR) {
1095 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
1096 /* To avoid CPU hogging in case it's bad, which it
1102 for(ufd = ufds; ufd != NULL; ufd = ufd->next) {
1105 if(ufd->type == UFD_LISTEN) {
1106 if(FD_ISSET(ufd->fd, &rfds)) {
1108 if((newfd = accept(ufd->fd, (struct sockaddr *)&ss, &sslen)) < 0) {
1109 if(ufd->d.l.lp->errcb != NULL)
1110 ufd->d.l.lp->errcb(ufd->d.l.lp, errno, ufd->d.l.lp->data);
1113 nufd = mkufd(newfd, UFD_SOCK, nsk);
1114 nufd->d.s.family = ufd->d.l.family;
1115 sksetstate(nsk, SOCK_EST);
1116 memcpy(nufd->d.s.remote = smalloc(sslen), &ss, sslen);
1117 nufd->d.s.remotelen = sslen;
1118 if(ss.ss_family == PF_UNIX)
1120 if(ufd->d.l.lp->acceptcb != NULL)
1121 ufd->d.l.lp->acceptcb(ufd->d.l.lp, nsk->back, ufd->d.l.lp->data);
1124 if(FD_ISSET(ufd->fd, &efds)) {
1125 retlen = sizeof(ret);
1126 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1127 if(ufd->d.l.lp->errcb != NULL)
1128 ufd->d.l.lp->errcb(ufd->d.l.lp, ret, ufd->d.l.lp->data);
1132 if(ufd->sk->state == SOCK_SYN) {
1133 if(FD_ISSET(ufd->fd, &efds)) {
1134 retlen = sizeof(ret);
1135 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1136 if(ufd->sk->back->conncb != NULL)
1137 ufd->sk->back->conncb(ufd->sk->back, ret, ufd->sk->back->data);
1141 if(FD_ISSET(ufd->fd, &rfds) || FD_ISSET(ufd->fd, &wfds)) {
1142 sksetstate(ufd->sk, SOCK_EST);
1143 linksock(&cbatch, ufd->sk->back);
1145 } else if(ufd->sk->state == SOCK_EST) {
1146 if(FD_ISSET(ufd->fd, &efds)) {
1147 retlen = sizeof(ret);
1148 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1149 sockerror(ufd->sk, ret);
1153 if(FD_ISSET(ufd->fd, &rfds))
1157 if(FD_ISSET(ufd->fd, &wfds)) {
1158 if(sockflush(ufd)) {
1159 sockerror(ufd->sk, errno);
1172 static struct ufd *getskufd(struct socket *sk)
1175 if(sk->back->ufd != NULL)
1176 return(sk->back->ufd);
1177 if((sk = sk->back->pnext) == NULL)
1183 int socksettos(struct socket *sk, int tos)
1189 if(ufd->type != UFD_SOCK) {
1193 if(ufd->d.s.family == AF_UNIX)
1194 return(0); /* Unix sockets are always perfect. :) */
1195 if(ufd->d.s.family == AF_INET)
1202 case SOCK_TOS_MINCOST:
1205 case SOCK_TOS_MAXREL:
1208 case SOCK_TOS_MAXTP:
1211 case SOCK_TOS_MINDELAY:
1215 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1218 if(setsockopt(ufd->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
1220 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1225 if(ufd->d.s.family == AF_INET6)
1231 case SOCK_TOS_MINCOST:
1232 buf = confgetint("net", "diffserv-mincost");
1234 case SOCK_TOS_MAXREL:
1235 buf = confgetint("net", "diffserv-maxrel");
1237 case SOCK_TOS_MAXTP:
1238 buf = confgetint("net", "diffserv-maxtp");
1240 case SOCK_TOS_MINDELAY:
1241 buf = confgetint("net", "diffserv-mindelay");
1244 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1248 On Linux, the API IPv6 flow label management doesn't seem to
1249 be entirely complete, so I guess this will have to wait.
1251 if(setsockopt(...) < 0)
1253 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1259 flog(LOG_WARNING, "could not set TOS on sock of family %i", ufd->d.s.family);
1266 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1268 struct sockaddr_storage addr;
1272 static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1274 static char buf[80];
1276 struct sockaddr_in *ipv4;
1280 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1283 data->callback(NULL, 0, data->data);
1285 ipv4 = (struct sockaddr_in *)&data->addr;
1286 memcpy(&ipv4->sin_addr, buf, 4);
1287 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1291 data->callback(NULL, 0, data->data);
1297 int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1304 struct resolvedata *rdata;
1305 struct sockaddr_in ipv4;
1311 if((p = strchr(addr, ':')) != NULL)
1316 ipv4.sin_family = AF_INET;
1317 ipv4.sin_port = htons(port);
1318 if(inet_aton(addr, &ipv4.sin_addr))
1320 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1322 sigemptyset(&sigset);
1323 sigaddset(&sigset, SIGCHLD);
1324 sigprocmask(SIG_BLOCK, &sigset, NULL);
1325 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1327 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1332 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1333 for(i = 3; i < FD_SETSIZE; i++)
1338 signal(SIGALRM, SIG_DFL);
1340 if((he = gethostbyname(addr)) == NULL)
1342 write(pfd[1], he->h_addr_list[0], 4);
1346 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1347 rdata = smalloc(sizeof(*rdata));
1349 rdata->callback = callback;
1351 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1352 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1353 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1360 static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1363 struct sockaddr_storage name;
1369 if(getsockname(fd, (struct sockaddr *)&name, &len) < 0)
1371 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
1374 *namebuf = memcpy(smalloc(len), &name, len);
1380 int lstgetlocalname(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1385 return(getlocalname(ufd->fd, namebuf, lenbuf));
1388 int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1393 if(ufd->type != UFD_SOCK) {
1397 return(getlocalname(ufd->fd, namebuf, lenbuf));
1400 static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1402 if(dst->sa_family != src->sa_family)
1404 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1407 switch(src->sa_family)
1410 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1413 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1416 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1421 static int makepublic(struct sockaddr *addr)
1425 struct sockaddr *pname;
1427 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1429 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1434 sethostaddr(addr, pname);
1439 static int getremotename(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1442 struct sockaddr *name;
1444 switch(confgetint("net", "mode")) {
1447 if(!getlocalname(fd, &name, &len)) {
1453 flog(LOG_ERR, "could not get remotely accessible name by any means");
1459 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1465 int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1470 if(ufd->type != UFD_SOCK) {
1478 return(getremotename(ufd->fd, namebuf, lenbuf));
1481 int lstgetremotename(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1486 return(getremotename(ufd->fd, namebuf, lenbuf));
1489 int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1491 struct sockaddr *name1, *name2;
1492 socklen_t len1, len2;
1493 struct ufd *ufd1, *ufd2;
1495 ufd1 = getskufd(sk);
1496 ufd2 = getskufd(sk2);
1497 if((ufd1->type != UFD_SOCK) || (ufd2->type != UFD_SOCK)) {
1501 if(ufd1->d.s.family != ufd2->d.s.family)
1503 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1506 if(getremotename(ufd1->fd, &name1, &len1))
1508 if(getremotename(ufd2->fd, &name2, &len2)) {
1512 sethostaddr(name1, name2);
1519 int lstgetremotename2(struct lport *lp, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1521 struct sockaddr *name1, *name2;
1522 socklen_t len1, len2;
1523 struct ufd *ufd1, *ufd2;
1526 ufd2 = getskufd(sk2);
1527 if(ufd2->type != UFD_SOCK) {
1531 if(ufd1->d.l.family != ufd2->d.s.family)
1533 flog(LOG_ERR, "using lstgetremotename2 with sockets of differing family: %i %i", ufd1->d.l.family, ufd2->d.s.family);
1536 if(getremotename(ufd1->fd, &name1, &len1))
1538 if(getremotename(ufd2->fd, &name2, &len2)) {
1542 sethostaddr(name1, name2);
1549 int getucred(struct socket *sk, uid_t *uid, gid_t *gid)
1554 if(ufd->type != UFD_SOCK) {
1558 if(ufd->d.s.family != AF_UNIX) {
1562 *uid = ufd->d.s.ucred.uid;
1563 *gid = ufd->d.s.ucred.gid;
1567 /* void sockblock(struct socket *sk, int block) */
1569 /* struct ufd *ufd; */
1571 /* ufd = getskufd(sk); */
1572 /* ufd->ignread = block; */
1575 int sockfamily(struct socket *sk)
1580 if(ufd->type != UFD_SOCK) {
1584 return(ufd->d.s.family);
1587 int sockpeeraddr(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1592 if(ufd->type != UFD_SOCK) {
1596 if(ufd->d.s.remote == NULL)
1598 *namebuf = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, ufd->d.s.remotelen);
1600 *lenbuf = ufd->d.s.remotelen;
1604 char *formatsockpeer(struct socket *sk)
1606 struct sockaddr *name;
1610 if(sockpeeraddr(sk, &name, &nlen))
1612 ret = formataddress(name, nlen);
1617 int addreq(struct sockaddr *x, struct sockaddr *y)
1619 struct sockaddr_un *u1, *u2;
1620 struct sockaddr_in *n1, *n2;
1622 struct sockaddr_in6 *s1, *s2;
1625 if(x->sa_family != y->sa_family)
1627 switch(x->sa_family) {
1629 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1630 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1634 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1635 if(n1->sin_port != n2->sin_port)
1637 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1642 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1643 if(s1->sin6_port != s2->sin6_port)
1645 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1653 char *formataddress(struct sockaddr *arg, socklen_t arglen)
1655 struct sockaddr_in *ipv4;
1657 struct sockaddr_in6 *ipv6;
1659 static char *ret = NULL;
1665 switch(arg->sa_family)
1668 ret = sstrdup("Unix socket");
1671 ipv4 = (struct sockaddr_in *)arg;
1672 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1674 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1678 ipv6 = (struct sockaddr_in6 *)arg;
1679 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1681 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
1685 errno = EPFNOSUPPORT;
1694 * It was very nice to use this, but it seems
1695 * to mess things up, so I guess it has to go... :-(
1698 static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1700 struct sockaddr *arg;
1702 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1703 * lowercase letters to 1, so I do this
1705 struct sockaddr_in *ipv4;
1708 arg = *(struct sockaddr **)(args[0]);
1709 arglen = *(socklen_t *)(args[1]);
1710 switch(arg->sa_family)
1713 UNIX = (struct sockaddr_un *)arg;
1714 ret = fprintf(stream, "%s", UNIX->sun_path);
1717 ipv4 = (struct sockaddr_in *)arg;
1718 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1722 errno = EPFNOSUPPORT;
1728 static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1731 argtypes[0] = PA_POINTER;
1733 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1734 * be an int, so I guess this should be
1740 static int init(int hup)
1745 if(register_printf_function('N', formataddress, formataddress_arginfo))
1747 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1755 static void terminate(void)
1763 static struct module me =
1771 .terminate = terminate