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 /** The Diffserv value to use on IPv6 connections when the
70 * minimize cost TOS value is used (see the TOS VALUES
72 {CONF_VAR_INT, "diffserv-mincost", {.num = 0}},
73 /** The Diffserv value to use on IPv6 connections when the
74 * maximize reliability TOS value is used (see the TOS VALUES
76 {CONF_VAR_INT, "diffserv-maxrel", {.num = 0}},
77 /** The Diffserv value to use on IPv6 connections when the
78 * maximize throughput TOS value is used (see the TOS VALUES
80 {CONF_VAR_INT, "diffserv-maxtp", {.num = 0}},
81 /** The Diffserv value to use on IPv6 connections when the
82 * minimize delay TOS value is used (see the TOS VALUES
84 {CONF_VAR_INT, "diffserv-mindelay", {.num = 0}},
85 /** If enabled, the IP TOS interface will be used to set Diffserv
86 * codepoints on IPv4 sockets, by shifting the DSCP value two bits
87 * to the left (remember, the DSCP field in the IPv4 header is
88 * defined as the 6 uppermost bits of the TOS field, the lower two
89 * being left for ECN). This may only work on Linux. */
90 {CONF_VAR_BOOL, "dscp-tos", {.num = 0}},
94 static struct socket *sockets = NULL;
97 /* XXX: Get autoconf for all this... */
98 int getpublicaddr(int af, struct sockaddr **addr, socklen_t *lenbuf)
100 struct sockaddr_in *ipv4;
101 struct configvar *var;
105 struct ifreq *ifr, req;
110 var = confgetvar("net", "visibleipv4");
111 if(var->val.ipv4.s_addr != 0)
113 ipv4 = smalloc(sizeof(*ipv4));
114 ipv4->sin_family = AF_INET;
115 ipv4->sin_addr.s_addr = var->val.ipv4.s_addr;
116 *addr = (struct sockaddr *)ipv4;
117 *lenbuf = sizeof(*ipv4);
120 if((pif = icswcstombs(confgetstr("net", "publicif"), NULL, NULL)) == NULL)
122 flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno));
127 if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
129 conf.ifc_buf = smalloc(conf.ifc_len = 65536);
130 if(ioctl(sock, SIOCGIFCONF, &conf) < 0)
136 bufend = ((char *)conf.ifc_buf) + conf.ifc_len;
138 for(ifr = conf.ifc_ifcu.ifcu_req; (void *)ifr < bufend; ifr++)
140 if(strcmp(ifr->ifr_name, pif))
142 memset(&req, 0, sizeof(req));
143 memcpy(req.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
144 if(ioctl(sock, SIOCGIFFLAGS, &req) < 0)
146 if(!(req.ifr_flags & IFF_UP))
148 flog(LOG_WARNING, "public interface is down");
151 if(ifr->ifr_addr.sa_family != AF_INET)
153 flog(LOG_WARNING, "address of the public interface is not AF_INET");
156 ipv4 = smalloc(sizeof(*ipv4));
157 memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr));
164 *addr = (struct sockaddr *)ipv4;
165 *lenbuf = sizeof(*ipv4);
174 static struct socket *newsock(int type)
178 new = smalloc(sizeof(*new));
179 memset(new, 0, sizeof(*new));
182 new->isrealsocket = 1;
196 new->outbuf.s.buf = NULL;
197 new->outbuf.s.bufsize = 0;
198 new->outbuf.s.datasize = 0;
199 new->inbuf.s.buf = NULL;
200 new->inbuf.s.bufsize = 0;
201 new->inbuf.s.datasize = 0;
204 new->outbuf.d.f = new->outbuf.d.l = NULL;
205 new->inbuf.d.f = new->inbuf.d.l = NULL;
212 new->acceptcb = NULL;
222 static struct socket *mksock(int domain, int type)
227 if((fd = socket(domain, type, 0)) < 0)
229 flog(LOG_CRIT, "could not create socket: %s", strerror(errno));
234 new->family = domain;
235 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
239 struct socket *wrapsock(int fd)
243 new = newsock(SOCK_STREAM);
245 new->state = SOCK_EST;
246 new->isrealsocket = 0;
247 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
251 static void unlinksock(struct socket *sk)
254 sk->prev->next = sk->next;
256 sk->next->prev = sk->prev;
263 void getsock(struct socket *sk)
268 void putsock(struct socket *sk)
270 struct dgrambuf *buf;
272 if(--(sk->refcount) == 0)
277 if(sk->outbuf.s.buf != NULL)
278 free(sk->outbuf.s.buf);
279 if(sk->inbuf.s.buf != NULL)
280 free(sk->inbuf.s.buf);
283 while((buf = sk->outbuf.d.f) != NULL)
285 sk->outbuf.d.f = buf->next;
290 while((buf = sk->inbuf.d.f) != NULL)
292 sk->inbuf.d.f = buf->next;
300 if(sk->remote != NULL)
306 void sockpushdata(struct socket *sk, void *buf, size_t size)
311 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + size, 1, 1);
312 memmove(sk->inbuf.s.buf + size, sk->inbuf.s.buf, sk->inbuf.s.datasize);
313 memcpy(sk->inbuf.s.buf, buf, size);
314 sk->inbuf.s.datasize += size;
323 void *sockgetinbuf(struct socket *sk, size_t *size)
326 struct dgrambuf *dbuf;
331 if((sk->inbuf.s.buf == NULL) || (sk->inbuf.s.datasize == 0))
336 buf = sk->inbuf.s.buf;
337 *size = sk->inbuf.s.datasize;
338 sk->inbuf.s.buf = NULL;
339 sk->inbuf.s.bufsize = sk->inbuf.s.datasize = 0;
342 if((dbuf = sk->inbuf.d.f) == NULL)
344 sk->inbuf.d.f = dbuf->next;
345 if(dbuf->next == NULL)
346 sk->inbuf.d.l = NULL;
356 static void recvcmsg(struct socket *sk, struct msghdr *msg)
358 struct cmsghdr *cmsg;
360 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
362 #if UNIX_AUTH_STYLE == 1
363 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
366 if(sk->ucred.uid == -1)
368 cred = (struct ucred *)CMSG_DATA(cmsg);
369 sk->ucred.uid = cred->uid;
370 sk->ucred.gid = cred->gid;
377 static void sockrecv(struct socket *sk)
380 struct dgrambuf *dbuf;
385 memset(&msg, 0, sizeof(msg));
386 msg.msg_iov = &bufvec;
388 msg.msg_control = cbuf;
389 msg.msg_controllen = sizeof(cbuf);
393 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
394 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
395 * how to read the inqueue size on other OSs */
396 if(sk->isrealsocket) {
397 if(ioctl(sk->fd, SIOCINQ, &inq))
399 /* I don't really know what could go wrong here, so let's
400 * assume it's transient. */
401 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), sk->fd);
405 /* There are perils when trying to use SIOCINQ on files >2GiB... */
413 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + inq, 1, 1);
416 bufvec.iov_base = sk->inbuf.s.buf + sk->inbuf.s.datasize;
417 bufvec.iov_len = inq;
418 ret = recvmsg(sk->fd, &msg, 0);
420 ret = read(sk->fd, sk->inbuf.s.buf + sk->inbuf.s.datasize, inq);
421 msg.msg_controllen = 0;
426 if((errno == EINTR) || (errno == EAGAIN))
428 if(sk->errcb != NULL)
429 sk->errcb(sk, errno, sk->data);
433 if(msg.msg_flags & MSG_CTRUNC)
434 flog(LOG_DEBUG, "ancillary data was truncated");
439 if(sk->errcb != NULL)
440 sk->errcb(sk, 0, sk->data);
444 sk->inbuf.s.datasize += ret;
445 if(sk->readcb != NULL)
446 sk->readcb(sk, sk->data);
449 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
450 if(ioctl(sk->fd, SIOCINQ, &inq))
452 /* I don't really know what could go wrong here, so let's
453 * assume it's transient. */
454 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), sk->fd);
460 dbuf = smalloc(sizeof(*dbuf));
461 dbuf->data = smalloc(inq);
462 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
464 ret = recvfrom(sk->fd, dbuf->data, inq, 0, dbuf->addr, &dbuf->addrlen);
466 msg.msg_name = dbuf->addr;
467 msg.msg_namelen = dbuf->addrlen;
468 bufvec.iov_base = dbuf->data;
469 bufvec.iov_len = inq;
470 ret = recvmsg(sk->fd, &msg, 0);
471 dbuf->addrlen = msg.msg_namelen;
477 if((errno == EINTR) || (errno == EAGAIN))
479 if(sk->errcb != NULL)
480 sk->errcb(sk, errno, sk->data);
484 if(msg.msg_flags & MSG_CTRUNC)
485 flog(LOG_DEBUG, "ancillary data was truncated");
488 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
489 * have EOF), but rather an empty packet. I don't know if any
490 * other potential DGRAM protocols might have an EOF
491 * condition, so let's play safe. */
497 if(!((sk->family == AF_INET) || (sk->family == AF_INET6)))
499 if(sk->errcb != NULL)
500 sk->errcb(sk, 0, sk->data);
505 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
506 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
508 if(sk->inbuf.d.l != NULL)
509 sk->inbuf.d.l->next = dbuf;
511 sk->inbuf.d.f = dbuf;
512 sk->inbuf.d.l = dbuf;
513 if(sk->readcb != NULL)
514 sk->readcb(sk, sk->data);
519 static void sockflush(struct socket *sk)
522 struct dgrambuf *dbuf;
528 ret = send(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
530 ret = write(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize);
533 if((errno != EINTR) && (errno != EAGAIN))
535 if(sk->errcb != NULL)
536 sk->errcb(sk, errno, sk->data);
543 memmove(sk->outbuf.s.buf, ((char *)sk->outbuf.s.buf) + ret, sk->outbuf.s.datasize -= ret);
544 if(sk->writecb != NULL)
545 sk->writecb(sk, sk->data);
549 dbuf = sk->outbuf.d.f;
550 if((sk->outbuf.d.f = dbuf->next) == NULL)
551 sk->outbuf.d.l = NULL;
552 sendto(sk->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
556 if(sk->writecb != NULL)
557 sk->writecb(sk, sk->data);
562 void closesock(struct socket *sk)
564 struct sockaddr_un *un;
566 if((sk->family == AF_UNIX) && !sockgetlocalname(sk, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX))
568 if((sk->state == SOCK_LST) && strchr(un->sun_path, '/'))
570 if(unlink(un->sun_path))
571 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
574 sk->state = SOCK_STL;
580 void sockqueue(struct socket *sk, void *data, size_t size)
582 struct dgrambuf *new;
584 if(sk->state == SOCK_STL)
589 sizebuf(&(sk->outbuf.s.buf), &(sk->outbuf.s.bufsize), sk->outbuf.s.datasize + size, 1, 1);
590 memcpy(sk->outbuf.s.buf + sk->outbuf.s.datasize, data, size);
591 sk->outbuf.s.datasize += size;
594 if(sk->remote == NULL)
596 new = smalloc(sizeof(*new));
598 memcpy(new->data = smalloc(size), data, new->size = size);
599 memcpy(new->addr = smalloc(sk->remotelen), sk->remote, new->addrlen = sk->remotelen);
600 if(sk->outbuf.d.l == NULL)
602 sk->outbuf.d.l = sk->outbuf.d.f = new;
604 sk->outbuf.d.l->next = new;
605 sk->outbuf.d.l = new;
611 size_t sockgetdatalen(struct socket *sk)
619 ret = sk->inbuf.s.datasize;
623 for(b = sk->inbuf.d.f; b != NULL; b = b->next)
630 size_t sockqueuesize(struct socket *sk)
638 ret = sk->outbuf.s.datasize;
642 for(b = sk->outbuf.d.f; b != NULL; b = b->next)
650 * Seriously, I don't know if it's naughty or not to remove
651 * pre-existing Unix sockets.
653 static int rebindunix(struct socket *sk, struct sockaddr *name, socklen_t namelen)
655 struct sockaddr_un *un;
658 if((sk->family != AF_UNIX) || (name->sa_family != PF_UNIX))
660 un = (struct sockaddr_un *)name;
661 if(stat(un->sun_path, &sb))
663 if(!S_ISSOCK(sb.st_mode))
665 if(unlink(un->sun_path))
667 if(bind(sk->fd, name, namelen) < 0)
673 * The difference between netcslisten() and netcslistenlocal() is that
674 * netcslistenlocal() always listens on the local host, instead of
675 * following proxy/passive mode directions. It is suitable for eg. the
676 * UI channel, while the file sharing networks should, naturally, use
677 * netcslisten() instead.
680 struct socket *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data)
685 /* I don't know if this is actually correct (it probably isn't),
686 * but since, at on least Linux systems, PF_* are specifically
687 * #define'd to their AF_* counterparts, it allows for a severely
688 * smoother implementation. If it breaks something on your
689 * platform, please tell me so.
691 if((sk = mksock(name->sa_family, type)) == NULL)
693 sk->state = SOCK_LST;
694 if(confgetint("net", "reuseaddr"))
697 setsockopt(sk->fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
699 if((bind(sk->fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(sk, name, namelen) < 0)))
704 if(listen(sk->fd, 16) < 0)
714 struct socket *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data)
716 if(confgetint("net", "mode") == 1)
721 if(confgetint("net", "mode") == 0)
722 return(netcslistenlocal(type, name, namelen, func, data));
727 struct socket *netcstcplisten(int port, int local, void (*func)(struct socket *, struct socket *, void *), void *data)
729 struct sockaddr_in addr;
731 struct sockaddr_in6 addr6;
733 struct socket *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct socket *, struct socket *, void *), void *);
737 csfunc = netcslistenlocal;
739 csfunc = netcslisten;
741 memset(&addr6, 0, sizeof(addr6));
742 addr6.sin6_family = AF_INET6;
743 addr6.sin6_port = htons(port);
744 addr6.sin6_addr = in6addr_any;
745 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
747 if((ret == NULL) && (errno != EAFNOSUPPORT))
750 memset(&addr, 0, sizeof(addr));
751 addr.sin_family = AF_INET;
752 addr.sin_port = htons(port);
753 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
756 struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
761 mode = confgetint("net", "mode");
762 if((mode == 0) || (mode == 1))
764 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
766 if(bind(sk->fd, name, namelen) < 0)
771 sk->state = SOCK_EST;
778 struct socket *netdupsock(struct socket *sk)
780 struct socket *newsk;
782 newsk = newsock(sk->type);
783 if((newsk->fd = dup(sk->fd)) < 0)
785 flog(LOG_WARNING, "could not dup() socket: %s", strerror(errno));
789 newsk->state = sk->state;
790 newsk->ignread = sk->ignread;
791 if(sk->remote != NULL)
792 memcpy(newsk->remote = smalloc(sk->remotelen), sk->remote, newsk->remotelen = sk->remotelen);
796 void netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
798 if(sk->remote != NULL)
800 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
804 struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
809 mode = confgetint("net", "mode");
810 if((mode == 0) || (mode == 1))
812 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
814 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
815 if(!connect(sk->fd, addr, addrlen))
817 sk->state = SOCK_EST;
821 if(errno == EINPROGRESS)
823 sk->state = SOCK_SYN;
835 static void acceptunix(struct socket *sk)
840 #if UNIX_AUTH_STYLE == 1
841 if(setsockopt(sk->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
842 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", sk->fd, strerror(errno));
843 #elif UNIX_AUTH_STYLE == 2
844 if(getpeereid(sk->fd, &sk->ucred.uid, &sk->ucred.gid) < 0)
846 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", sk->fd, strerror(errno));
853 int pollsocks(int timeout)
858 fd_set rfds, wfds, efds;
859 struct socket *sk, *next, *newsk;
860 struct sockaddr_storage ss;
867 for(maxfd = 0, sk = sockets; sk != NULL; sk = sk->next)
869 if((sk->state == SOCK_STL) || (sk->fd < 0))
872 FD_SET(sk->fd, &rfds);
873 if((sk->state == SOCK_SYN) || (sockqueuesize(sk) > 0))
874 FD_SET(sk->fd, &wfds);
875 FD_SET(sk->fd, &efds);
879 tv.tv_sec = timeout / 1000;
880 tv.tv_usec = (timeout % 1000) * 1000;
881 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
886 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
887 /* To avoid CPU hogging in case it's bad, which it
893 for(sk = sockets; sk != NULL; sk = next)
900 if(FD_ISSET(fd, &rfds))
903 if((newfd = accept(fd, (struct sockaddr *)&ss, &sslen)) < 0)
905 if(sk->errcb != NULL)
906 sk->errcb(sk, errno, sk->data);
908 newsk = newsock(sk->type);
910 newsk->family = sk->family;
911 newsk->state = SOCK_EST;
912 memcpy(newsk->remote = smalloc(sslen), &ss, sslen);
913 newsk->remotelen = sslen;
914 if(ss.ss_family == PF_UNIX)
916 if(sk->acceptcb != NULL)
917 sk->acceptcb(sk, newsk, sk->data);
920 if(FD_ISSET(fd, &efds))
922 retlen = sizeof(ret);
923 getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
924 if(sk->errcb != NULL)
925 sk->errcb(sk, ret, sk->data);
930 if(FD_ISSET(fd, &efds))
932 retlen = sizeof(ret);
933 getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
934 if(sk->conncb != NULL)
935 sk->conncb(sk, ret, sk->data);
939 if(FD_ISSET(fd, &rfds) || FD_ISSET(fd, &wfds))
941 sk->state = SOCK_EST;
942 if(sk->conncb != NULL)
943 sk->conncb(sk, 0, sk->data);
947 if(FD_ISSET(fd, &efds))
949 retlen = sizeof(ret);
950 getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
951 if(sk->errcb != NULL)
952 sk->errcb(sk, ret, sk->data);
956 if(FD_ISSET(fd, &rfds))
958 if(FD_ISSET(fd, &wfds))
960 if(sockqueuesize(sk) > 0)
966 for(sk = sockets; sk != NULL; sk = next)
969 if(sk->refcount == 1 && (sockqueuesize(sk) == 0))
974 if(sk->close && (sockqueuesize(sk) == 0))
976 if(sk->state == SOCK_STL)
985 int socksettos(struct socket *sk, int tos)
990 if(sk->family == AF_UNIX)
991 return(0); /* Unix sockets are always perfect. :) */
992 if(sk->family == AF_INET)
994 dscp2tos = confgetint("net", "dscp-tos");
1000 case SOCK_TOS_MINCOST:
1002 buf = confgetint("net", "diffserv-mincost") << 2;
1006 case SOCK_TOS_MAXREL:
1008 buf = confgetint("net", "diffserv-maxrel") << 2;
1012 case SOCK_TOS_MAXTP:
1014 buf = confgetint("net", "diffserv-maxtp") << 2;
1018 case SOCK_TOS_MINDELAY:
1020 buf = confgetint("net", "diffserv-mindelay") << 2;
1025 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1028 if(setsockopt(sk->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
1030 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1035 if(sk->family == AF_INET6)
1041 case SOCK_TOS_MINCOST:
1042 buf = confgetint("net", "diffserv-mincost");
1044 case SOCK_TOS_MAXREL:
1045 buf = confgetint("net", "diffserv-maxrel");
1047 case SOCK_TOS_MAXTP:
1048 buf = confgetint("net", "diffserv-maxtp");
1050 case SOCK_TOS_MINDELAY:
1051 buf = confgetint("net", "diffserv-mindelay");
1054 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1058 On Linux, the API IPv6 flow label management doesn't seem to
1059 be entirely complete, so I guess this will have to wait.
1061 if(setsockopt(...) < 0)
1063 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1069 flog(LOG_WARNING, "could not set TOS on sock of family %i", sk->family);
1076 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1078 struct sockaddr_storage addr;
1082 static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1084 static char buf[80];
1086 struct sockaddr_in *ipv4;
1090 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1093 data->callback(NULL, 0, data->data);
1095 ipv4 = (struct sockaddr_in *)&data->addr;
1096 memcpy(&ipv4->sin_addr, buf, 4);
1097 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1101 data->callback(NULL, 0, data->data);
1107 int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1114 struct resolvedata *rdata;
1115 struct sockaddr_in ipv4;
1121 if((p = strchr(addr, ':')) != NULL)
1126 ipv4.sin_family = AF_INET;
1127 ipv4.sin_port = htons(port);
1128 if(inet_aton(addr, &ipv4.sin_addr))
1130 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1132 sigemptyset(&sigset);
1133 sigaddset(&sigset, SIGCHLD);
1134 sigprocmask(SIG_BLOCK, &sigset, NULL);
1135 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1137 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1142 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1143 for(i = 3; i < FD_SETSIZE; i++)
1148 signal(SIGALRM, SIG_DFL);
1150 if((he = gethostbyname(addr)) == NULL)
1152 write(pfd[1], he->h_addr_list[0], 4);
1156 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1157 rdata = smalloc(sizeof(*rdata));
1159 rdata->callback = callback;
1161 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1162 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1163 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1170 int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1173 struct sockaddr_storage name;
1176 if((sk->state == SOCK_STL) || (sk->fd < 0))
1179 if(getsockname(sk->fd, (struct sockaddr *)&name, &len) < 0)
1181 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
1184 *namebuf = memcpy(smalloc(len), &name, len);
1190 static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1192 if(dst->sa_family != src->sa_family)
1194 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1197 switch(src->sa_family)
1200 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1203 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1206 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1211 static int makepublic(struct sockaddr *addr)
1215 struct sockaddr *pname;
1217 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1219 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1224 sethostaddr(addr, pname);
1229 int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1232 struct sockaddr *name;
1234 switch(confgetint("net", "mode"))
1238 if((sk->state == SOCK_STL) || (sk->fd < 0))
1243 if(!sockgetlocalname(sk, &name, &len))
1250 flog(LOG_ERR, "could not get remotely accessible name by any means");
1256 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1262 int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1264 struct sockaddr *name1, *name2;
1265 socklen_t len1, len2;
1267 if(sk->family != sk2->family)
1269 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", sk->family, sk2->family);
1272 if(sockgetremotename(sk, &name1, &len1))
1274 if(sockgetremotename(sk2, &name2, &len2)) {
1278 sethostaddr(name1, name2);
1285 int addreq(struct sockaddr *x, struct sockaddr *y)
1287 struct sockaddr_un *u1, *u2;
1288 struct sockaddr_in *n1, *n2;
1290 struct sockaddr_in6 *s1, *s2;
1293 if(x->sa_family != y->sa_family)
1295 switch(x->sa_family) {
1297 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1298 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1302 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1303 if(n1->sin_port != n2->sin_port)
1305 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1310 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1311 if(s1->sin6_port != s2->sin6_port)
1313 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1321 char *formataddress(struct sockaddr *arg, socklen_t arglen)
1323 struct sockaddr_in *ipv4;
1325 struct sockaddr_in6 *ipv6;
1327 static char *ret = NULL;
1333 switch(arg->sa_family)
1336 ret = sstrdup("Unix socket");
1339 ipv4 = (struct sockaddr_in *)arg;
1340 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1342 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1346 ipv6 = (struct sockaddr_in6 *)arg;
1347 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1349 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
1353 errno = EPFNOSUPPORT;
1362 * It was very nice to use this, but it seems
1363 * to mess things up, so I guess it has to go... :-(
1366 static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1368 struct sockaddr *arg;
1370 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1371 * lowercase letters to 1, so I do this
1373 struct sockaddr_in *ipv4;
1376 arg = *(struct sockaddr **)(args[0]);
1377 arglen = *(socklen_t *)(args[1]);
1378 switch(arg->sa_family)
1381 UNIX = (struct sockaddr_un *)arg;
1382 ret = fprintf(stream, "%s", UNIX->sun_path);
1385 ipv4 = (struct sockaddr_in *)arg;
1386 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1390 errno = EPFNOSUPPORT;
1396 static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1399 argtypes[0] = PA_POINTER;
1401 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1402 * be an int, so I guess this should be
1408 static int init(int hup)
1413 if(register_printf_function('N', formataddress, formataddress_arginfo))
1415 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1423 static void terminate(void)
1425 while(sockets != NULL)
1426 unlinksock(sockets);
1429 static struct module me =
1437 .terminate = terminate