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 sockdebug(int level, struct socket *sk, char *format, ...)
366 if((sk->dbgnm == NULL) || (level > sk->dbglvl))
368 va_start(args, format);
369 tb = vsprintf2(format, args);
371 fprintf(stderr, "%s: %s\n", sk->dbgnm, tb);
375 void socksetdebug(struct socket *sk, int level, char *nm, ...)
381 tb = vsprintf2(nm, args);
383 sk->dbgnm = sprintf2("%s (f)", tb);
384 sk->back->dbgnm = sprintf2("%s (b)", tb);
387 sk->back->dbglvl = level;
388 sockdebug(1, sk, "enabled debugging");
391 static void freesock(struct socket *sk)
393 struct dgrambuf *buf;
395 sockdebug(1, sk, "freeing socket");
397 while((buf = sk->buf.d.f) != NULL) {
398 sk->buf.d.f = buf->next;
402 if(sk->buf.s.buf != NULL)
405 if(sk->dbgnm != NULL)
411 void putsock(struct socket *sk)
415 if(--(sk->refcount) < 0) {
416 flog(LOG_CRIT, "BUG: socket refcount < 0");
419 if((sk->refcount == 0) && (sk->back->refcount == 0)) {
426 void quitsock(struct socket *sk)
434 static void linksock(struct scons **list, struct socket *sk)
438 for(sc = *list; sc != NULL; sc = sc->n) {
442 sc = smalloc(sizeof(*sc));
451 void sockpushdata(struct socket *sk, void *buf, size_t size)
458 sizebuf(&sk->buf.s.buf, &sk->buf.s.bufsize, sk->buf.s.datasize + size, 1, 1);
459 memmove(sk->buf.s.buf + size, sk->buf.s.buf, sk->buf.s.datasize);
460 memcpy(sk->buf.s.buf, buf, size);
461 sk->buf.s.datasize += size;
462 linksock(&rbatch, sk);
466 /* Read as the preterite of `read' */
467 void sockread(struct socket *sk)
469 if((sockgetdatalen(sk) == 0) && (sk->eos == 1))
470 linksock(&rbatch, sk);
471 linksock(&wbatch, sk->back);
474 void freedgbuf(struct dgrambuf *dg)
483 struct dgrambuf *sockgetdgbuf(struct socket *sk)
485 struct dgrambuf *dbuf;
487 if((dbuf = sk->buf.d.f) == NULL)
489 sk->buf.d.f = dbuf->next;
490 if(dbuf->next == NULL)
497 void *sockgetinbuf(struct socket *sk, size_t *size)
500 struct dgrambuf *dbuf;
503 dbuf = sockgetdgbuf(sk);
509 if((sk->buf.s.buf == NULL) || (sk->buf.s.datasize == 0))
512 sockdebug(2, sk, "read 0 bytes", *size);
516 *size = sk->buf.s.datasize;
517 sk->buf.s.buf = NULL;
518 sk->buf.s.bufsize = sk->buf.s.datasize = 0;
521 sockdebug(2, sk, "read %zi bytes", *size);
525 void sockqueue(struct socket *sk, void *data, size_t size)
527 struct dgrambuf *new;
528 struct sockaddr *remote;
531 sockdebug(2, sk, "queued %zi bytes", size);
534 if(sk->state == SOCK_STL)
537 if(sockpeeraddr(sk, &remote, &remotelen))
539 new = smalloc(sizeof(*new));
541 memcpy(new->data = smalloc(size), data, new->size = size);
543 new->addrlen = remotelen;
544 if(sk->back->buf.d.l == NULL)
546 sk->back->buf.d.l = sk->back->buf.d.f = new;
548 sk->back->buf.d.l->next = new;
549 sk->back->buf.d.l = new;
552 sizebuf(&(sk->back->buf.s.buf), &(sk->back->buf.s.bufsize), sk->back->buf.s.datasize + size, 1, 1);
553 memcpy(sk->back->buf.s.buf + sk->back->buf.s.datasize, data, size);
554 sk->back->buf.s.datasize += size;
556 linksock(&rbatch, sk->back);
559 void sockqueuedg(struct socket *sk, struct dgrambuf *dg)
561 if(sk->state == SOCK_STL) {
566 flog(LOG_ERR, "BUG: sockqueuedg called on non-dgram socket");
571 if(sk->back->buf.d.l == NULL)
573 sk->back->buf.d.l = sk->back->buf.d.f = dg;
575 sk->back->buf.d.l->next = dg;
576 sk->back->buf.d.l = dg;
578 linksock(&rbatch, sk->back);
581 void sockerror(struct socket *sk, int en)
583 sksetstate(sk, SOCK_STL);
584 if(sk->back->errcb != NULL)
585 sk->back->errcb(sk->back, en, sk->back->data);
588 static void recvcmsg(struct ufd *ufd, struct msghdr *msg)
590 struct cmsghdr *cmsg;
592 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
594 #if UNIX_AUTH_STYLE == 1
595 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
598 if(ufd->d.s.ucred.uid == -1)
600 cred = (struct ucred *)CMSG_DATA(cmsg);
601 ufd->d.s.ucred.uid = cred->uid;
602 ufd->d.s.ucred.gid = cred->gid;
609 static int ufddgram(struct ufd *ufd)
613 if(ufd->type == UFD_SOCK) {
614 dgram = ufd->d.s.type == SOCK_DGRAM;
615 } else if(ufd->type == UFD_PIPE) {
618 flog(LOG_ERR, "BUG: calling ufddgram on ufd of bad type %i", ufd->type);
621 if(ufd->sk == NULL) {
622 flog(LOG_ERR, "BUG: calling ufddgram on socketless ufd (type %i)", ufd->type);
625 if(dgram != ufd->sk->dgram) {
626 flog(LOG_ERR, "BUG: ufd/socket dgram value mismatch");
632 static void sockrecv(struct ufd *ufd)
636 struct dgrambuf *dbuf;
642 memset(&msg, 0, sizeof(msg));
643 msg.msg_iov = &bufvec;
645 msg.msg_control = cbuf;
646 msg.msg_controllen = sizeof(cbuf);
647 if((dgram = ufddgram(ufd)) < 0)
650 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
651 if(ioctl(ufd->fd, SIOCINQ, &inq))
653 /* I don't really know what could go wrong here, so let's
654 * assume it's transient. */
655 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), ufd->fd);
661 dbuf = smalloc(sizeof(*dbuf));
662 dbuf->data = smalloc(inq);
663 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
664 msg.msg_name = dbuf->addr;
665 msg.msg_namelen = dbuf->addrlen;
666 bufvec.iov_base = dbuf->data;
667 bufvec.iov_len = inq;
668 ret = recvmsg(ufd->fd, &msg, 0);
669 dbuf->addrlen = msg.msg_namelen;
673 if((errno == EINTR) || (errno == EAGAIN))
676 sockerror(ufd->sk, errno);
679 if(msg.msg_flags & MSG_CTRUNC)
680 flog(LOG_DEBUG, "ancillary data was truncated");
683 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
684 * have EOF), but rather an empty packet. I don't know if any
685 * other potential DGRAM protocols might have an EOF
686 * condition, so let's play safe. */
690 if((ufd->type != UFD_SOCK) || !((ufd->d.s.family == AF_INET) || (ufd->d.s.family == AF_INET6)))
697 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
698 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
700 sockqueuedg(ufd->sk, dbuf);
702 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
703 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
704 * how to read the inqueue size on other OSs */
705 if(ufd->type == UFD_SOCK) {
706 if(ioctl(ufd->fd, SIOCINQ, &inq))
708 /* I don't really know what could go wrong here, so let's
709 * assume it's transient. */
710 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), ufd->fd);
714 /* There are perils when trying to use SIOCINQ on files >2GiB... */
722 /* This part could be optimized by telling the kernel to read
723 * directly into ufd->sk->back->buf, but that would be uglier
724 * by not using the socket function interface. */
726 if(ufd->type == UFD_SOCK)
728 bufvec.iov_base = buf;
729 bufvec.iov_len = inq;
730 ret = recvmsg(ufd->fd, &msg, 0);
732 ret = read(ufd->fd, buf, inq);
733 msg.msg_controllen = 0;
739 if((errno == EINTR) || (errno == EAGAIN))
742 sockerror(ufd->sk, errno);
745 if(msg.msg_flags & MSG_CTRUNC)
746 flog(LOG_DEBUG, "ancillary data was truncated");
756 sockqueue(ufd->sk, buf, ret);
761 static int sockflush(struct ufd *ufd)
764 struct dgrambuf *dbuf;
767 if((dgram = ufddgram(ufd)) < 0) {
772 dbuf = sockgetdgbuf(ufd->sk);
773 sendto(ufd->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
776 if(ufd->type == UFD_SOCK)
777 ret = send(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
779 ret = write(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize);
783 memmove(ufd->sk->buf.s.buf, ((char *)ufd->sk->buf.s.buf) + ret, ufd->sk->buf.s.datasize -= ret);
790 void closesock(struct socket *sk)
792 sockdebug(1, sk, "closed");
793 sksetstate(sk, SOCK_STL);
794 if(sk->back->eos == 0)
796 linksock(&rbatch, sk->back);
799 size_t sockgetdatalen(struct socket *sk)
806 for(b = sk->buf.d.f; b != NULL; b = b->next)
809 ret = sk->buf.s.datasize;
814 /* size_t sockqueuesize(struct socket *sk) */
816 /* return(sockgetdatalen(sk->back)); */
819 size_t socktqueuesize(struct socket *sk)
825 ret += sockgetdatalen(sk->back);
826 if((sk = sk->back->pnext) == NULL)
831 ssize_t sockqueueleft(struct socket *sk)
833 return(sk->back->maxbuf - sockgetdatalen(sk->back));
837 * Seriously, I don't know if it's naughty or not to remove
838 * pre-existing Unix sockets.
840 static int rebindunix(struct ufd *ufd, struct sockaddr *name, socklen_t namelen)
842 struct sockaddr_un *un;
845 if((ufd->d.l.family != AF_UNIX) || (name->sa_family != PF_UNIX))
847 un = (struct sockaddr_un *)name;
848 if(stat(un->sun_path, &sb))
850 if(!S_ISSOCK(sb.st_mode))
852 if(unlink(un->sun_path))
854 if(bind(ufd->fd, name, namelen) < 0)
859 void closelport(struct lport *lp)
862 struct sockaddr_un *un;
865 if((ufd->d.l.family == AF_UNIX) && !getlocalname(ufd->fd, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX) && strchr(un->sun_path, '/')) {
866 if(unlink(un->sun_path))
867 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
873 * The difference between netcslisten() and netcslistenlocal() is that
874 * netcslistenlocal() always listens on the local host, instead of
875 * following proxy/passive mode directions. It is suitable for eg. the
876 * UI channel, while the file sharing networks should, naturally, use
877 * netcslisten() instead.
880 struct lport *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
887 /* I don't know if this is actually correct (it probably isn't),
888 * but since, at on least Linux systems, PF_* are specifically
889 * #define'd to their AF_* counterparts, it allows for a severely
890 * smoother implementation. If it breaks something on your
891 * platform, please tell me so.
893 if((fd = socket(name->sa_family, type, 0)) < 0)
895 if(confgetint("net", "reuseaddr")) {
897 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
899 ufd = mkufd(fd, UFD_LISTEN, NULL);
900 ufd->d.l.family = name->sa_family;
901 lp = memset(smalloc(sizeof(*lp)), 0, sizeof(*lp));
904 if((bind(fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(ufd, name, namelen) < 0))) {
908 if(listen(fd, 16) < 0)
918 struct lport *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data)
920 if(confgetint("net", "mode") == 1)
925 if(confgetint("net", "mode") == 0)
926 return(netcslistenlocal(type, name, namelen, func, data));
931 struct lport *netcstcplisten(int port, int local, void (*func)(struct lport *, struct socket *, void *), void *data)
933 struct sockaddr_in addr;
935 struct sockaddr_in6 addr6;
937 struct lport *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct lport *, struct socket *, void *), void *);
941 csfunc = netcslistenlocal;
943 csfunc = netcslisten;
945 memset(&addr6, 0, sizeof(addr6));
946 addr6.sin6_family = AF_INET6;
947 addr6.sin6_port = htons(port);
948 addr6.sin6_addr = in6addr_any;
949 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
951 if((ret == NULL) && (errno != EAFNOSUPPORT))
954 memset(&addr, 0, sizeof(addr));
955 addr.sin_family = AF_INET;
956 addr.sin_port = htons(port);
957 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
960 struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
965 mode = confgetint("net", "mode");
966 if((mode == 0) || (mode == 1))
968 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
970 if(bind(sk->ufd->fd, name, namelen) < 0)
975 sksetstate(sk, SOCK_EST);
982 struct socket *netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
986 nufd = dupufd(sk->back->ufd);
987 getsock(sk = nufd->sk->back);
988 memcpy(nufd->d.s.remote = smalloc(addrlen), addr, nufd->d.s.remotelen = addrlen);
993 struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
998 mode = confgetint("net", "mode");
999 if((mode == 0) || (mode == 1))
1001 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
1003 memcpy(sk->ufd->d.s.remote = smalloc(addrlen), addr, sk->ufd->d.s.remotelen = addrlen);
1004 sk->back->conncb = func;
1005 sk->back->data = data;
1008 if(!connect(sk->ufd->fd, addr, addrlen))
1010 sksetstate(sk, SOCK_EST);
1011 linksock(&cbatch, sk->back);
1014 if(errno == EINPROGRESS)
1016 sksetstate(sk, SOCK_SYN);
1026 static void acceptunix(struct ufd *ufd)
1031 #if UNIX_AUTH_STYLE == 1
1032 if(setsockopt(ufd->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
1033 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", ufd->fd, strerror(errno));
1034 #elif UNIX_AUTH_STYLE == 2
1035 if(getpeereid(ufd->fd, &ufd->d.s.ucred.uid, &ufd->d.s.ucred.gid) < 0)
1037 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", ufd->fd, strerror(errno));
1038 ufd->d.s.ucred.uid = -1;
1039 ufd->d.s.ucred.gid = -1;
1044 static void runbatches(void)
1046 struct scons *sc, *nsc;
1048 for(sc = cbatch, cbatch = NULL; sc; sc = nsc) {
1050 if(sc->s->conncb != NULL)
1051 sc->s->conncb(sc->s, 0, sc->s->data);
1055 for(sc = rbatch, rbatch = NULL; sc; sc = nsc) {
1057 if(sc->s->readcb != NULL)
1058 sc->s->readcb(sc->s, sc->s->data);
1059 if((sockgetdatalen(sc->s) == 0) && (sc->s->eos == 1)) {
1060 if(sc->s->errcb != NULL)
1061 sc->s->errcb(sc->s, 0, sc->s->data);
1067 for(sc = wbatch, wbatch = NULL; sc; sc = nsc) {
1069 if(sc->s->writecb != NULL)
1070 sc->s->writecb(sc->s, sc->s->data);
1076 static void cleansocks(void)
1078 struct ufd *ufd, *next;
1081 for(ufd = ufds; ufd != NULL; ufd = next) {
1084 dead = (ufd->fd < 0);
1085 if(ufd->sk->state == SOCK_STL)
1087 if((ufd->sk->state == SOCK_EST) && (sockgetdatalen(ufd->sk) == 0))
1091 if(ufd->sk->eos == 1) {
1096 if((ufd->sk->refcount == 1) && (ufd->sk->back->refcount == 0)) {
1104 int pollsocks(int timeout)
1109 fd_set rfds, wfds, efds;
1110 struct ufd *ufd, *nufd;
1112 struct sockaddr_storage ss;
1120 for(maxfd = 0, ufd = ufds; ufd != NULL; ufd = ufd->next) {
1123 if(!ufd->ignread && ((ufd->sk == NULL) || (sockqueueleft(ufd->sk) > 0)))
1124 FD_SET(ufd->fd, &rfds);
1125 if(ufd->sk != NULL) {
1126 if(sockgetdatalen(ufd->sk) > 0)
1127 FD_SET(ufd->fd, &wfds);
1128 else if(ufd->sk->state == SOCK_SYN)
1129 FD_SET(ufd->fd, &wfds);
1131 FD_SET(ufd->fd, &efds);
1135 if(rbatch || wbatch || cbatch)
1137 tv.tv_sec = timeout / 1000;
1138 tv.tv_usec = (timeout % 1000) * 1000;
1139 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
1141 if(errno != EINTR) {
1142 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
1143 /* To avoid CPU hogging in case it's bad, which it
1149 for(ufd = ufds; ufd != NULL; ufd = ufd->next) {
1152 if(ufd->type == UFD_LISTEN) {
1153 if(FD_ISSET(ufd->fd, &rfds)) {
1155 if((newfd = accept(ufd->fd, (struct sockaddr *)&ss, &sslen)) < 0) {
1156 if(ufd->d.l.lp->errcb != NULL)
1157 ufd->d.l.lp->errcb(ufd->d.l.lp, errno, ufd->d.l.lp->data);
1160 nufd = mkufd(newfd, UFD_SOCK, nsk);
1161 nufd->d.s.family = ufd->d.l.family;
1162 sksetstate(nsk, SOCK_EST);
1163 memcpy(nufd->d.s.remote = smalloc(sslen), &ss, sslen);
1164 nufd->d.s.remotelen = sslen;
1165 if(ss.ss_family == PF_UNIX)
1167 if(ufd->d.l.lp->acceptcb != NULL)
1168 ufd->d.l.lp->acceptcb(ufd->d.l.lp, nsk->back, ufd->d.l.lp->data);
1171 if(FD_ISSET(ufd->fd, &efds)) {
1172 retlen = sizeof(ret);
1173 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1174 if(ufd->d.l.lp->errcb != NULL)
1175 ufd->d.l.lp->errcb(ufd->d.l.lp, ret, ufd->d.l.lp->data);
1179 if(ufd->sk->state == SOCK_SYN) {
1180 if(FD_ISSET(ufd->fd, &efds)) {
1181 retlen = sizeof(ret);
1182 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1183 if(ufd->sk->back->conncb != NULL)
1184 ufd->sk->back->conncb(ufd->sk->back, ret, ufd->sk->back->data);
1188 if(FD_ISSET(ufd->fd, &rfds) || FD_ISSET(ufd->fd, &wfds)) {
1189 sksetstate(ufd->sk, SOCK_EST);
1190 linksock(&cbatch, ufd->sk->back);
1192 } else if(ufd->sk->state == SOCK_EST) {
1193 if(FD_ISSET(ufd->fd, &efds)) {
1194 retlen = sizeof(ret);
1195 getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
1196 sockerror(ufd->sk, ret);
1200 if(FD_ISSET(ufd->fd, &rfds))
1204 if(FD_ISSET(ufd->fd, &wfds)) {
1205 if(sockflush(ufd)) {
1206 sockerror(ufd->sk, errno);
1219 static struct ufd *getskufd(struct socket *sk)
1222 if(sk->back->ufd != NULL)
1223 return(sk->back->ufd);
1224 if((sk = sk->back->pnext) == NULL)
1230 int socksettos(struct socket *sk, int tos)
1236 if(ufd->type != UFD_SOCK) {
1240 if(ufd->d.s.family == AF_UNIX)
1241 return(0); /* Unix sockets are always perfect. :) */
1242 if(ufd->d.s.family == AF_INET)
1249 case SOCK_TOS_MINCOST:
1252 case SOCK_TOS_MAXREL:
1255 case SOCK_TOS_MAXTP:
1258 case SOCK_TOS_MINDELAY:
1262 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1265 if(setsockopt(ufd->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
1267 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1272 if(ufd->d.s.family == AF_INET6)
1278 case SOCK_TOS_MINCOST:
1279 buf = confgetint("net", "diffserv-mincost");
1281 case SOCK_TOS_MAXREL:
1282 buf = confgetint("net", "diffserv-maxrel");
1284 case SOCK_TOS_MAXTP:
1285 buf = confgetint("net", "diffserv-maxtp");
1287 case SOCK_TOS_MINDELAY:
1288 buf = confgetint("net", "diffserv-mindelay");
1291 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1295 On Linux, the API IPv6 flow label management doesn't seem to
1296 be entirely complete, so I guess this will have to wait.
1298 if(setsockopt(...) < 0)
1300 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1306 flog(LOG_WARNING, "could not set TOS on sock of family %i", ufd->d.s.family);
1313 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1315 struct sockaddr_storage addr;
1319 static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1321 static char buf[80];
1323 struct sockaddr_in *ipv4;
1327 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1330 data->callback(NULL, 0, data->data);
1332 ipv4 = (struct sockaddr_in *)&data->addr;
1333 memcpy(&ipv4->sin_addr, buf, 4);
1334 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1338 data->callback(NULL, 0, data->data);
1344 int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1351 struct resolvedata *rdata;
1352 struct sockaddr_in ipv4;
1358 if((p = strchr(addr, ':')) != NULL)
1363 ipv4.sin_family = AF_INET;
1364 ipv4.sin_port = htons(port);
1365 if(inet_aton(addr, &ipv4.sin_addr))
1367 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1369 sigemptyset(&sigset);
1370 sigaddset(&sigset, SIGCHLD);
1371 sigprocmask(SIG_BLOCK, &sigset, NULL);
1372 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1374 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1379 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1380 for(i = 3; i < FD_SETSIZE; i++)
1385 signal(SIGALRM, SIG_DFL);
1387 if((he = gethostbyname(addr)) == NULL)
1389 write(pfd[1], he->h_addr_list[0], 4);
1393 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1394 rdata = smalloc(sizeof(*rdata));
1396 rdata->callback = callback;
1398 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1399 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1400 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1407 static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1410 struct sockaddr_storage name;
1416 if(getsockname(fd, (struct sockaddr *)&name, &len) < 0)
1418 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
1421 *namebuf = memcpy(smalloc(len), &name, len);
1427 int lstgetlocalname(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1432 return(getlocalname(ufd->fd, namebuf, lenbuf));
1435 int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1440 if(ufd->type != UFD_SOCK) {
1444 return(getlocalname(ufd->fd, namebuf, lenbuf));
1447 static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1449 if(dst->sa_family != src->sa_family)
1451 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1454 switch(src->sa_family)
1457 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1460 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1463 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1468 static int makepublic(struct sockaddr *addr)
1472 struct sockaddr *pname;
1474 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1476 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1481 sethostaddr(addr, pname);
1486 static int getremotename(int fd, struct sockaddr **namebuf, socklen_t *lenbuf)
1489 struct sockaddr *name;
1491 switch(confgetint("net", "mode")) {
1494 if(!getlocalname(fd, &name, &len)) {
1500 flog(LOG_ERR, "could not get remotely accessible name by any means");
1506 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1512 int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1517 if(ufd->type != UFD_SOCK) {
1525 return(getremotename(ufd->fd, namebuf, lenbuf));
1528 int lstgetremotename(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf)
1533 return(getremotename(ufd->fd, namebuf, lenbuf));
1536 int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1538 struct sockaddr *name1, *name2;
1539 socklen_t len1, len2;
1540 struct ufd *ufd1, *ufd2;
1542 ufd1 = getskufd(sk);
1543 ufd2 = getskufd(sk2);
1544 if((ufd1->type != UFD_SOCK) || (ufd2->type != UFD_SOCK)) {
1548 if(ufd1->d.s.family != ufd2->d.s.family)
1550 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family);
1553 if(getremotename(ufd1->fd, &name1, &len1))
1555 if(getremotename(ufd2->fd, &name2, &len2)) {
1559 sethostaddr(name1, name2);
1566 int lstgetremotename2(struct lport *lp, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1568 struct sockaddr *name1, *name2;
1569 socklen_t len1, len2;
1570 struct ufd *ufd1, *ufd2;
1573 ufd2 = getskufd(sk2);
1574 if(ufd2->type != UFD_SOCK) {
1578 if(ufd1->d.l.family != ufd2->d.s.family)
1580 flog(LOG_ERR, "using lstgetremotename2 with sockets of differing family: %i %i", ufd1->d.l.family, ufd2->d.s.family);
1583 if(getremotename(ufd1->fd, &name1, &len1))
1585 if(getremotename(ufd2->fd, &name2, &len2)) {
1589 sethostaddr(name1, name2);
1596 int getucred(struct socket *sk, uid_t *uid, gid_t *gid)
1601 if(ufd->type != UFD_SOCK) {
1605 if(ufd->d.s.family != AF_UNIX) {
1609 *uid = ufd->d.s.ucred.uid;
1610 *gid = ufd->d.s.ucred.gid;
1614 /* void sockblock(struct socket *sk, int block) */
1616 /* struct ufd *ufd; */
1618 /* ufd = getskufd(sk); */
1619 /* ufd->ignread = block; */
1622 int sockfamily(struct socket *sk)
1627 if(ufd->type != UFD_SOCK) {
1631 return(ufd->d.s.family);
1634 int sockpeeraddr(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1639 if(ufd->type != UFD_SOCK) {
1643 if(ufd->d.s.remote == NULL)
1645 *namebuf = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, ufd->d.s.remotelen);
1647 *lenbuf = ufd->d.s.remotelen;
1651 char *formatsockpeer(struct socket *sk)
1653 struct sockaddr *name;
1657 if(sockpeeraddr(sk, &name, &nlen))
1659 ret = formataddress(name, nlen);
1664 int addreq(struct sockaddr *x, struct sockaddr *y)
1666 struct sockaddr_un *u1, *u2;
1667 struct sockaddr_in *n1, *n2;
1669 struct sockaddr_in6 *s1, *s2;
1672 if(x->sa_family != y->sa_family)
1674 switch(x->sa_family) {
1676 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1677 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1681 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1682 if(n1->sin_port != n2->sin_port)
1684 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1689 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1690 if(s1->sin6_port != s2->sin6_port)
1692 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1700 char *formataddress(struct sockaddr *arg, socklen_t arglen)
1702 struct sockaddr_in *ipv4;
1704 struct sockaddr_in6 *ipv6;
1706 static char *ret = NULL;
1712 switch(arg->sa_family)
1715 ret = sstrdup("Unix socket");
1718 ipv4 = (struct sockaddr_in *)arg;
1719 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1721 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1725 ipv6 = (struct sockaddr_in6 *)arg;
1726 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1728 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
1732 errno = EPFNOSUPPORT;
1741 * It was very nice to use this, but it seems
1742 * to mess things up, so I guess it has to go... :-(
1745 static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1747 struct sockaddr *arg;
1749 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1750 * lowercase letters to 1, so I do this
1752 struct sockaddr_in *ipv4;
1755 arg = *(struct sockaddr **)(args[0]);
1756 arglen = *(socklen_t *)(args[1]);
1757 switch(arg->sa_family)
1760 UNIX = (struct sockaddr_un *)arg;
1761 ret = fprintf(stream, "%s", UNIX->sun_path);
1764 ipv4 = (struct sockaddr_in *)arg;
1765 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1769 errno = EPFNOSUPPORT;
1775 static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1778 argtypes[0] = PA_POINTER;
1780 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1781 * be an int, so I guess this should be
1787 static int init(int hup)
1792 if(register_printf_function('N', formataddress, formataddress_arginfo))
1794 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1802 static void terminate(void)
1810 static struct module me =
1818 .terminate = terminate