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;
251 if(ufd->type == UFD_SOCK) {
252 if(ufd->d.s.remote != NULL)
253 free(ufd->d.s.remote);
258 static struct ufd *mkufd(int fd, int type, struct socket *sk)
262 ufd = memset(smalloc(sizeof(*ufd)), 0, sizeof(*ufd));
265 getsock(ufd->sk = sk);
268 if(type == UFD_SOCK) {
269 ufd->d.s.ucred.uid = -1;
270 ufd->d.s.ucred.gid = -1;
279 static struct ufd *dupufd(struct ufd *ufd)
285 nsk = sockpair(ufd->sk->dgram);
288 nufd = mkufd(ufd->fd, ufd->type, nsk);
291 if((nufd->fd = dup(ufd->fd)) < 0)
293 flog(LOG_WARNING, "could not dup() fd: %s", strerror(errno));
297 if(ufd->type == UFD_SOCK) {
298 nufd->d.s.family = ufd->d.s.family;
299 nufd->d.s.type = ufd->d.s.type;
300 nufd->d.s.ucred.uid = ufd->d.s.ucred.uid;
301 nufd->d.s.ucred.gid = ufd->d.s.ucred.gid;
302 if(ufd->d.s.remote != NULL)
303 nufd->d.s.remote = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, nufd->d.s.remotelen = ufd->d.s.remotelen);
304 } else if(ufd->type == UFD_LISTEN) {
305 nufd->d.l.family = ufd->d.l.family;
310 static struct socket *mksock(int domain, int type)
316 if((fd = socket(domain, type, 0)) < 0)
318 flog(LOG_CRIT, "could not create socket: %s", strerror(errno));
321 sk = sockpair(type == SOCK_DGRAM);
322 ufd = mkufd(fd, UFD_SOCK, sk);
323 ufd->d.s.family = domain;
324 ufd->d.s.type = type;
325 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
329 struct socket *wrapsock(int fd)
335 ufd = mkufd(fd, UFD_PIPE, sk->back);
336 sksetstate(sk, SOCK_EST);
337 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
341 void getsock(struct socket *sk)
346 static void freesock(struct socket *sk)
348 struct dgrambuf *buf;
351 while((buf = sk->buf.d.f) != NULL) {
352 sk->buf.d.f = buf->next;
356 if(sk->buf.s.buf != NULL)
363 void putsock(struct socket *sk)
365 if(--(sk->refcount) < 0) {
366 flog(LOG_CRIT, "BUG: socket refcount < 0");
369 if((sk->refcount == 0) && (sk->back->refcount == 0)) {
375 static void linksock(struct scons **list, struct socket *sk)
379 for(sc = *list; sc != NULL; sc = sc->n) {
383 sc = smalloc(sizeof(*sc));
392 void sockpushdata(struct socket *sk, void *buf, size_t size)
399 sizebuf(&sk->buf.s.buf, &sk->buf.s.bufsize, sk->buf.s.datasize + size, 1, 1);
400 memmove(sk->buf.s.buf + size, sk->buf.s.buf, sk->buf.s.datasize);
401 memcpy(sk->buf.s.buf, buf, size);
402 sk->buf.s.datasize += size;
403 linksock(&rbatch, sk);
407 /* Read as the preterite of `read' */
408 void sockread(struct socket *sk)
410 linksock(&wbatch, sk->back);
413 void freedgbuf(struct dgrambuf *dg)
422 struct dgrambuf *sockgetdgbuf(struct socket *sk)
424 struct dgrambuf *dbuf;
426 if((dbuf = sk->buf.d.f) == NULL)
428 sk->buf.d.f = dbuf->next;
429 if(dbuf->next == NULL)
436 void *sockgetinbuf(struct socket *sk, size_t *size)
439 struct dgrambuf *dbuf;
442 dbuf = sockgetdgbuf(sk);
448 if((sk->buf.s.buf == NULL) || (sk->buf.s.datasize == 0))
454 *size = sk->buf.s.datasize;
455 sk->buf.s.buf = NULL;
456 sk->buf.s.bufsize = sk->buf.s.datasize = 0;
462 void sockqueue(struct socket *sk, void *data, size_t size)
464 struct dgrambuf *new;
465 struct sockaddr *remote;
470 if(sk->state == SOCK_STL)
473 if(sockpeeraddr(sk, &remote, &remotelen))
475 new = smalloc(sizeof(*new));
477 memcpy(new->data = smalloc(size), data, new->size = size);
479 new->addrlen = remotelen;
480 if(sk->back->buf.d.l == NULL)
482 sk->back->buf.d.l = sk->back->buf.d.f = new;
484 sk->back->buf.d.l->next = new;
485 sk->back->buf.d.l = new;
488 sizebuf(&(sk->back->buf.s.buf), &(sk->back->buf.s.bufsize), sk->back->buf.s.datasize + size, 1, 1);
489 memcpy(sk->back->buf.s.buf + sk->back->buf.s.datasize, data, size);
490 sk->back->buf.s.datasize += size;
492 linksock(&rbatch, sk->back);
495 void sockqueuedg(struct socket *sk, struct dgrambuf *dg)
497 if(sk->state == SOCK_STL) {
502 flog(LOG_ERR, "BUG: sockqueuedg called on non-dgram socket");
507 if(sk->back->buf.d.l == NULL)
509 sk->back->buf.d.l = sk->back->buf.d.f = dg;
511 sk->back->buf.d.l->next = dg;
512 sk->back->buf.d.l = dg;
514 linksock(&rbatch, sk->back);
517 void sockeos(struct socket *sk)
519 sksetstate(sk, SOCK_STL);
520 if(sk->back->eos == 0)
522 linksock(&rbatch, sk->back);
525 static void sockerror(struct socket *sk, int en)
527 sksetstate(sk, SOCK_STL);
528 if(sk->back->errcb != NULL)
529 sk->back->errcb(sk->back, en, sk->back->data);
532 static void recvcmsg(struct ufd *ufd, struct msghdr *msg)
534 struct cmsghdr *cmsg;
536 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
538 #if UNIX_AUTH_STYLE == 1
539 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
542 if(ufd->d.s.ucred.uid == -1)
544 cred = (struct ucred *)CMSG_DATA(cmsg);
545 ufd->d.s.ucred.uid = cred->uid;
546 ufd->d.s.ucred.gid = cred->gid;
553 static int ufddgram(struct ufd *ufd)
557 if(ufd->type == UFD_SOCK) {
558 dgram = ufd->d.s.type == SOCK_DGRAM;
559 } else if(ufd->type == UFD_PIPE) {
562 flog(LOG_ERR, "BUG: calling ufddgram on ufd of bad type %i", ufd->type);
565 if(ufd->sk == NULL) {
566 flog(LOG_ERR, "BUG: calling ufddgram on socketless ufd (type %i)", ufd->type);
569 if(dgram != ufd->sk->dgram) {
570 flog(LOG_ERR, "BUG: ufd/socket dgram value mismatch");
576 static void sockrecv(struct ufd *ufd)
580 struct dgrambuf *dbuf;
586 memset(&msg, 0, sizeof(msg));
587 msg.msg_iov = &bufvec;
589 msg.msg_control = cbuf;
590 msg.msg_controllen = sizeof(cbuf);
591 if((dgram = ufddgram(ufd)) < 0)
594 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
595 if(ioctl(ufd->fd, SIOCINQ, &inq))
597 /* I don't really know what could go wrong here, so let's
598 * assume it's transient. */
599 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), ufd->fd);
605 dbuf = smalloc(sizeof(*dbuf));
606 dbuf->data = smalloc(inq);
607 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
608 msg.msg_name = dbuf->addr;
609 msg.msg_namelen = dbuf->addrlen;
610 bufvec.iov_base = dbuf->data;
611 bufvec.iov_len = inq;
612 ret = recvmsg(ufd->fd, &msg, 0);
613 dbuf->addrlen = msg.msg_namelen;
617 if((errno == EINTR) || (errno == EAGAIN))
620 sockerror(ufd->sk, errno);
623 if(msg.msg_flags & MSG_CTRUNC)
624 flog(LOG_DEBUG, "ancillary data was truncated");
627 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
628 * have EOF), but rather an empty packet. I don't know if any
629 * other potential DGRAM protocols might have an EOF
630 * condition, so let's play safe. */
634 if((ufd->type != UFD_SOCK) || !((ufd->d.s.family == AF_INET) || (ufd->d.s.family == AF_INET6)))
641 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
642 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
644 sockqueuedg(ufd->sk, dbuf);
646 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
647 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
648 * how to read the inqueue size on other OSs */
649 if(ufd->type == UFD_SOCK) {
650 if(ioctl(ufd->fd, SIOCINQ, &inq))
652 /* I don't really know what could go wrong here, so let's
653 * assume it's transient. */
654 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), ufd->fd);
658 /* There are perils when trying to use SIOCINQ on files >2GiB... */
666 /* This part could be optimized by telling the kernel to read
667 * directly into ufd->sk->back->buf, but that would be uglier
668 * by not using the socket function interface. */
670 if(ufd->type == UFD_SOCK)
672 bufvec.iov_base = buf;
673 bufvec.iov_len = inq;
674 ret = recvmsg(ufd->fd, &msg, 0);
676 ret = read(ufd->fd, buf, inq);
677 msg.msg_controllen = 0;
683 if((errno == EINTR) || (errno == EAGAIN))
686 sockerror(ufd->sk, errno);
689 if(msg.msg_flags & MSG_CTRUNC)
690 flog(LOG_DEBUG, "ancillary data was truncated");
700 sockqueue(ufd->sk, buf, ret);
705 static void sockflush(struct ufd *ufd)
708 struct dgrambuf *dbuf;
711 if((dgram = ufddgram(ufd)) < 0)
714 dbuf = sockgetdgbuf(ufd->sk);
715 sendto(ufd->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
718 if(ufd->type == UFD_SOCK)
719 ret = send(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
721 ret = write(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize);
723 /* For now, assume transient error, since
724 * the socket is polled for errors */
728 memmove(ufd->sk->buf.s.buf, ((char *)ufd->sk->buf.s.buf) + ret, ufd->sk->buf.s.datasize -= ret);
734 void closesock(struct socket *sk)
737 struct sockaddr_un *un;
739 if((sk->family == AF_UNIX) && !sockgetlocalname(sk, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX))
741 if((sk->state == SOCK_LST) && strchr(un->sun_path, '/'))
743 if(unlink(un->sun_path))
744 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
748 sksetstate(sk, SOCK_STL);
752 size_t sockgetdatalen(struct socket *sk)
759 for(b = sk->buf.d.f; b != NULL; b = b->next)
762 ret = sk->buf.s.datasize;
767 size_t sockqueuesize(struct socket *sk)
769 return(sockgetdatalen(sk->back));
773 * Seriously, I don't know if it's naughty or not to remove
774 * pre-existing Unix sockets.
776 static int rebindunix(struct ufd *ufd, struct sockaddr *name, socklen_t namelen)
778 struct sockaddr_un *un;
781 if((ufd->d.l.family != AF_UNIX) || (name->sa_family != PF_UNIX))
783 un = (struct sockaddr_un *)name;
784 if(stat(un->sun_path, &sb))
786 if(!S_ISSOCK(sb.st_mode))
788 if(unlink(un->sun_path))
790 if(bind(ufd->fd, name, namelen) < 0)
795 void closelport(struct lport *lp)
801 * The difference between netcslisten() and netcslistenlocal() is that
802 * netcslistenlocal() always listens on the local host, instead of
803 * following proxy/passive mode directions. It is suitable for eg. the
804 * UI channel, while the file sharing networks should, naturally, use
805 * netcslisten() instead.
808 struct lport *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
815 /* I don't know if this is actually correct (it probably isn't),
816 * but since, at on least Linux systems, PF_* are specifically
817 * #define'd to their AF_* counterparts, it allows for a severely
818 * smoother implementation. If it breaks something on your
819 * platform, please tell me so.
821 if((fd = socket(name->sa_family, type, 0)) < 0)
823 if(confgetint("net", "reuseaddr")) {
825 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
827 ufd = mkufd(fd, UFD_LISTEN, NULL);
828 ufd->d.l.family = name->sa_family;
829 lp = memset(smalloc(sizeof(*lp)), 0, sizeof(*lp));
832 if((bind(fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(ufd, name, namelen) < 0))) {
836 if(listen(fd, 16) < 0)
846 struct lport *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
848 if(confgetint("net", "mode") == 1)
853 if(confgetint("net", "mode") == 0)
854 return(netcslistenlocal(type, name, namelen, func, data));
859 struct lport *netcstcplisten(int port, int local, void (*func)(struct lport *, struct socket *, void *), void *data)
861 struct sockaddr_in addr;
863 struct sockaddr_in6 addr6;
865 struct lport *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct lport *, struct socket *, void *), void *);
869 csfunc = netcslistenlocal;
871 csfunc = netcslisten;
873 memset(&addr6, 0, sizeof(addr6));
874 addr6.sin6_family = AF_INET6;
875 addr6.sin6_port = htons(port);
876 addr6.sin6_addr = in6addr_any;
877 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
879 if((ret == NULL) && (errno != EAFNOSUPPORT))
882 memset(&addr, 0, sizeof(addr));
883 addr.sin_family = AF_INET;
884 addr.sin_port = htons(port);
885 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
888 struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
893 mode = confgetint("net", "mode");
894 if((mode == 0) || (mode == 1))
896 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
898 if(bind(sk->ufd->fd, name, namelen) < 0)
903 sksetstate(sk, SOCK_EST);
910 struct socket *netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
914 nufd = dupufd(sk->back->ufd);
916 memcpy(nufd->d.s.remote = smalloc(addrlen), addr, nufd->d.s.remotelen = addrlen);
921 struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
926 mode = confgetint("net", "mode");
927 if((mode == 0) || (mode == 1))
929 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
931 memcpy(sk->ufd->d.s.remote = smalloc(addrlen), addr, sk->ufd->d.s.remotelen = addrlen);
932 sk->back->conncb = func;
933 sk->back->data = data;
934 if(!connect(sk->ufd->fd, addr, addrlen))
936 sksetstate(sk, SOCK_EST);
937 linksock(&cbatch, sk->back);
940 if(errno == EINPROGRESS)
942 sksetstate(sk, SOCK_SYN);
952 static void acceptunix(struct ufd *ufd)
957 #if UNIX_AUTH_STYLE == 1
958 if(setsockopt(ufd->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
959 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", ufd->fd, strerror(errno));
960 #elif UNIX_AUTH_STYLE == 2
961 if(getpeereid(ufd->fd, &ufd->d.s.ucred.uid, &ufd->d.s.ucred.gid) < 0)
963 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", ufd->fd, strerror(errno));
964 ufd->d.s.ucred.uid = -1;
965 ufd->d.s.ucred.gid = -1;
970 static void runbatches(void)
972 struct scons *sc, *nsc;
974 for(sc = cbatch, cbatch = NULL; sc; sc = nsc) {
976 sc->s->conncb(sc->s, 0, sc->s->data);
979 for(sc = rbatch, rbatch = NULL; sc; sc = nsc) {
981 sc->s->readcb(sc->s, sc->s->data);
984 for(sc = wbatch, wbatch = NULL; sc; sc = nsc) {
986 sc->s->writecb(sc->s, sc->s->data);
991 int pollsocks(int timeout)
996 fd_set rfds, wfds, efds;
997 struct ufd *ufd, *nufd, *next;
999 struct sockaddr_storage ss;
1006 for(maxfd = 0, ufd = ufds; ufd != NULL; ufd = ufd->next) {
1010 FD_SET(ufd->fd, &rfds);
1011 if(ufd->sk != NULL) {
1012 if(sockgetdatalen(ufd->sk) > 0)
1013 FD_SET(ufd->fd, &wfds);
1014 else if(ufd->sk->state == SOCK_SYN)
1015 FD_SET(ufd->fd, &wfds);
1017 FD_SET(ufd->fd, &efds);
1021 tv.tv_sec = timeout / 1000;
1022 tv.tv_usec = (timeout % 1000) * 1000;
1023 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
1025 if(errno != EINTR) {
1026 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
1027 /* To avoid CPU hogging in case it's bad, which it
1033 for(ufd = ufds; ufd != NULL; ufd = ufd->next)
1037 if(ufd->type == UFD_LISTEN) {
1038 if(FD_ISSET(ufd->fd, &rfds)) {
1040 if((newfd = accept(ufd->fd, (struct sockaddr *)&ss, &sslen)) < 0) {
1041 if(ufd->d.l.lp->errcb != NULL)
1042 ufd->d.l.lp->errcb(ufd->d.l.lp, errno, ufd->d.l.lp->data);
1045 nufd = mkufd(newfd, UFD_SOCK, nsk);
1046 nufd->d.s.family = ufd->d.l.family;
1047 sksetstate(nsk, SOCK_EST);
1048 memcpy(nufd->d.s.remote = smalloc(sslen), &ss, sslen);
1049 nufd->d.s.remotelen = sslen;
1050 if(ss.ss_family == PF_UNIX)
1052 if(ufd->d.l.lp->acceptcb != NULL)
1053 ufd->d.l.lp->acceptcb(ufd->d.l.lp, nsk, ufd->d.l.lp->data);
1056 if(FD_ISSET(ufd->fd, &efds)) {
1057 retlen = sizeof(ret);
1058 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1059 if(ufd->d.l.lp->errcb != NULL)
1060 ufd->d.l.lp->errcb(ufd->d.l.lp, ret, ufd->d.l.lp->data);
1064 if(ufd->sk->state == SOCK_SYN) {
1065 if(FD_ISSET(ufd->fd, &efds)) {
1066 retlen = sizeof(ret);
1067 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1068 if(ufd->sk->back->conncb != NULL)
1069 ufd->sk->back->conncb(ufd->sk->back, ret, ufd->sk->back->data);
1073 if(FD_ISSET(ufd->fd, &rfds) || FD_ISSET(ufd->fd, &wfds)) {
1074 sksetstate(ufd->sk, SOCK_EST);
1075 linksock(&cbatch, ufd->sk->back);
1077 } else if(ufd->sk->state == SOCK_EST) {
1078 if(FD_ISSET(ufd->fd, &efds)) {
1079 retlen = sizeof(ret);
1080 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1081 sockerror(ufd->sk, ret);
1085 if(FD_ISSET(ufd->fd, &rfds))
1087 if(FD_ISSET(ufd->fd, &wfds))
1092 for(ufd = ufds; ufd != NULL; ufd = next) {
1094 if(sockgetdatalen(ufd->sk) == 0) {
1099 if((ufd->sk->refcount == 1) && (ufd->sk->back->refcount == 0)) {
1109 static struct ufd *getskufd(struct socket *sk)
1112 if(sk->back->ufd != NULL)
1113 return(sk->back->ufd);
1114 if((sk = sk->back->pnext) == NULL)
1120 int socksettos(struct socket *sk, int tos)
1126 if(ufd->type != UFD_SOCK) {
1130 if(ufd->d.s.family == AF_UNIX)
1131 return(0); /* Unix sockets are always perfect. :) */
1132 if(ufd->d.s.family == AF_INET)
1139 case SOCK_TOS_MINCOST:
1142 case SOCK_TOS_MAXREL:
1145 case SOCK_TOS_MAXTP:
1148 case SOCK_TOS_MINDELAY:
1152 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1155 if(setsockopt(ufd->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
1157 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1162 if(ufd->d.s.family == AF_INET6)
1168 case SOCK_TOS_MINCOST:
1169 buf = confgetint("net", "diffserv-mincost");
1171 case SOCK_TOS_MAXREL:
1172 buf = confgetint("net", "diffserv-maxrel");
1174 case SOCK_TOS_MAXTP:
1175 buf = confgetint("net", "diffserv-maxtp");
1177 case SOCK_TOS_MINDELAY:
1178 buf = confgetint("net", "diffserv-mindelay");
1181 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1185 On Linux, the API IPv6 flow label management doesn't seem to
1186 be entirely complete, so I guess this will have to wait.
1188 if(setsockopt(...) < 0)
1190 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1196 flog(LOG_WARNING, "could not set TOS on sock of family %i", ufd->d.s.family);
1203 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1205 struct sockaddr_storage addr;
1209 static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1211 static char buf[80];
1213 struct sockaddr_in *ipv4;
1217 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1220 data->callback(NULL, 0, data->data);
1222 ipv4 = (struct sockaddr_in *)&data->addr;
1223 memcpy(&ipv4->sin_addr, buf, 4);
1224 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1228 data->callback(NULL, 0, data->data);
1234 int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1241 struct resolvedata *rdata;
1242 struct sockaddr_in ipv4;
1248 if((p = strchr(addr, ':')) != NULL)
1253 ipv4.sin_family = AF_INET;
1254 ipv4.sin_port = htons(port);
1255 if(inet_aton(addr, &ipv4.sin_addr))
1257 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1259 sigemptyset(&sigset);
1260 sigaddset(&sigset, SIGCHLD);
1261 sigprocmask(SIG_BLOCK, &sigset, NULL);
1262 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1264 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1269 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1270 for(i = 3; i < FD_SETSIZE; i++)
1275 signal(SIGALRM, SIG_DFL);
1277 if((he = gethostbyname(addr)) == NULL)
1279 write(pfd[1], he->h_addr_list[0], 4);
1283 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1284 rdata = smalloc(sizeof(*rdata));
1286 rdata->callback = callback;
1288 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1289 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1290 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1297 static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1300 struct sockaddr_storage name;
1306 if(getsockname(fd, (struct sockaddr *)&name, &len) < 0)
1308 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
1311 *namebuf = memcpy(smalloc(len), &name, len);
1317 int lstgetlocalname(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1322 return(getlocalname(ufd->fd, namebuf, lenbuf));
1325 int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1330 if(ufd->type != UFD_SOCK) {
1334 return(getlocalname(ufd->fd, namebuf, lenbuf));
1337 static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1339 if(dst->sa_family != src->sa_family)
1341 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1344 switch(src->sa_family)
1347 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1350 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1353 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1358 static int makepublic(struct sockaddr *addr)
1362 struct sockaddr *pname;
1364 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1366 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1371 sethostaddr(addr, pname);
1376 static int getremotename(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1379 struct sockaddr *name;
1381 switch(confgetint("net", "mode")) {
1384 if(!getlocalname(fd, &name, &len)) {
1390 flog(LOG_ERR, "could not get remotely accessible name by any means");
1396 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1402 int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1407 if(ufd->type != UFD_SOCK) {
1415 return(getremotename(ufd->fd, namebuf, lenbuf));
1418 int lstgetremotename(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1423 return(getremotename(ufd->fd, namebuf, lenbuf));
1426 int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1428 struct sockaddr *name1, *name2;
1429 socklen_t len1, len2;
1430 struct ufd *ufd1, *ufd2;
1432 ufd1 = getskufd(sk);
1433 ufd2 = getskufd(sk2);
1434 if((ufd1->type != UFD_SOCK) || (ufd2->type != UFD_SOCK)) {
1438 if(ufd1->d.s.family != ufd2->d.s.family)
1440 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1443 if(getremotename(ufd1->fd, &name1, &len1))
1445 if(getremotename(ufd2->fd, &name2, &len2)) {
1449 sethostaddr(name1, name2);
1456 int lstgetremotename2(struct lport *lp, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1458 struct sockaddr *name1, *name2;
1459 socklen_t len1, len2;
1460 struct ufd *ufd1, *ufd2;
1463 ufd2 = getskufd(sk2);
1464 if(ufd2->type != UFD_SOCK) {
1468 if(ufd1->d.s.family != ufd2->d.s.family)
1470 flog(LOG_ERR, "using lstgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1473 if(getremotename(ufd1->fd, &name1, &len1))
1475 if(getremotename(ufd2->fd, &name2, &len2)) {
1479 sethostaddr(name1, name2);
1486 int getucred(struct socket *sk, uid_t *uid, gid_t *gid)
1491 if(ufd->type != UFD_SOCK) {
1495 if(ufd->d.s.family != AF_UNIX) {
1499 *uid = ufd->d.s.ucred.uid;
1500 *gid = ufd->d.s.ucred.gid;
1504 void sockblock(struct socket *sk, int block)
1509 ufd->ignread = block;
1512 int sockfamily(struct socket *sk)
1517 if(ufd->type != UFD_SOCK) {
1521 return(ufd->d.s.family);
1524 int sockpeeraddr(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1529 if(ufd->type != UFD_SOCK) {
1533 if(ufd->d.s.remote == NULL)
1535 *namebuf = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, ufd->d.s.remotelen);
1537 *lenbuf = ufd->d.s.remotelen;
1541 char *formatsockpeer(struct socket *sk)
1543 struct sockaddr *name;
1547 if(sockpeeraddr(sk, &name, &nlen))
1549 ret = formataddress(name, nlen);
1554 int addreq(struct sockaddr *x, struct sockaddr *y)
1556 struct sockaddr_un *u1, *u2;
1557 struct sockaddr_in *n1, *n2;
1559 struct sockaddr_in6 *s1, *s2;
1562 if(x->sa_family != y->sa_family)
1564 switch(x->sa_family) {
1566 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1567 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1571 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1572 if(n1->sin_port != n2->sin_port)
1574 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1579 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1580 if(s1->sin6_port != s2->sin6_port)
1582 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1590 char *formataddress(struct sockaddr *arg, socklen_t arglen)
1592 struct sockaddr_in *ipv4;
1594 struct sockaddr_in6 *ipv6;
1596 static char *ret = NULL;
1602 switch(arg->sa_family)
1605 ret = sstrdup("Unix socket");
1608 ipv4 = (struct sockaddr_in *)arg;
1609 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1611 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1615 ipv6 = (struct sockaddr_in6 *)arg;
1616 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1618 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
1622 errno = EPFNOSUPPORT;
1631 * It was very nice to use this, but it seems
1632 * to mess things up, so I guess it has to go... :-(
1635 static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1637 struct sockaddr *arg;
1639 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1640 * lowercase letters to 1, so I do this
1642 struct sockaddr_in *ipv4;
1645 arg = *(struct sockaddr **)(args[0]);
1646 arglen = *(socklen_t *)(args[1]);
1647 switch(arg->sa_family)
1650 UNIX = (struct sockaddr_un *)arg;
1651 ret = fprintf(stream, "%s", UNIX->sun_path);
1654 ipv4 = (struct sockaddr_in *)arg;
1655 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1659 errno = EPFNOSUPPORT;
1665 static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1668 argtypes[0] = PA_POINTER;
1670 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1671 * be an int, so I guess this should be
1677 static int init(int hup)
1682 if(register_printf_function('N', formataddress, formataddress_arginfo))
1684 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1692 static void terminate(void)
1700 static struct module me =
1708 .terminate = terminate