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}},
90 static struct socket *sockets = NULL;
93 /* XXX: Get autoconf for all this... */
94 int getpublicaddr(int af, struct sockaddr **addr, socklen_t *lenbuf)
96 struct sockaddr_in *ipv4;
97 struct configvar *var;
101 struct ifreq *ifr, req;
106 var = confgetvar("net", "visibleipv4");
107 if(var->val.ipv4.s_addr != 0)
109 ipv4 = smalloc(sizeof(*ipv4));
110 ipv4->sin_family = AF_INET;
111 ipv4->sin_addr.s_addr = var->val.ipv4.s_addr;
112 *addr = (struct sockaddr *)ipv4;
113 *lenbuf = sizeof(*ipv4);
116 if((pif = icswcstombs(confgetstr("net", "publicif"), NULL, NULL)) == NULL)
118 flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno));
123 if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
125 conf.ifc_buf = smalloc(conf.ifc_len = 65536);
126 if(ioctl(sock, SIOCGIFCONF, &conf) < 0)
132 bufend = ((char *)conf.ifc_buf) + conf.ifc_len;
134 for(ifr = conf.ifc_ifcu.ifcu_req; (void *)ifr < bufend; ifr++)
136 if(strcmp(ifr->ifr_name, pif))
138 memset(&req, 0, sizeof(req));
139 memcpy(req.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
140 if(ioctl(sock, SIOCGIFFLAGS, &req) < 0)
142 if(!(req.ifr_flags & IFF_UP))
144 flog(LOG_WARNING, "public interface is down");
147 if(ifr->ifr_addr.sa_family != AF_INET)
149 flog(LOG_WARNING, "address of the public interface is not AF_INET");
152 ipv4 = smalloc(sizeof(*ipv4));
153 memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr));
160 *addr = (struct sockaddr *)ipv4;
161 *lenbuf = sizeof(*ipv4);
170 static struct socket *newsock(int type)
174 new = smalloc(sizeof(*new));
177 new->isrealsocket = 1;
191 new->outbuf.s.buf = NULL;
192 new->outbuf.s.bufsize = 0;
193 new->outbuf.s.datasize = 0;
194 new->inbuf.s.buf = NULL;
195 new->inbuf.s.bufsize = 0;
196 new->inbuf.s.datasize = 0;
199 new->outbuf.d.f = new->outbuf.d.l = NULL;
200 new->inbuf.d.f = new->inbuf.d.l = NULL;
207 new->acceptcb = NULL;
217 static struct socket *mksock(int domain, int type)
222 if((fd = socket(domain, type, 0)) < 0)
224 flog(LOG_CRIT, "could not create socket: %s", strerror(errno));
229 new->family = domain;
230 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
234 struct socket *wrapsock(int fd)
238 new = newsock(SOCK_STREAM);
240 new->state = SOCK_EST;
241 new->isrealsocket = 0;
242 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
246 static void unlinksock(struct socket *sk)
249 sk->prev->next = sk->next;
251 sk->next->prev = sk->prev;
258 void getsock(struct socket *sk)
263 void putsock(struct socket *sk)
265 struct dgrambuf *buf;
267 if(--(sk->refcount) == 0)
272 if(sk->outbuf.s.buf != NULL)
273 free(sk->outbuf.s.buf);
274 if(sk->inbuf.s.buf != NULL)
275 free(sk->inbuf.s.buf);
278 while((buf = sk->outbuf.d.f) != NULL)
280 sk->outbuf.d.f = buf->next;
285 while((buf = sk->inbuf.d.f) != NULL)
287 sk->inbuf.d.f = buf->next;
295 if(sk->remote != NULL)
301 void sockpushdata(struct socket *sk, void *buf, size_t size)
306 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + size, 1, 1);
307 memmove(sk->inbuf.s.buf + size, sk->inbuf.s.buf, sk->inbuf.s.datasize);
308 memcpy(sk->inbuf.s.buf, buf, size);
309 sk->inbuf.s.datasize += size;
318 void *sockgetinbuf(struct socket *sk, size_t *size)
321 struct dgrambuf *dbuf;
326 if((sk->inbuf.s.buf == NULL) || (sk->inbuf.s.datasize == 0))
331 buf = sk->inbuf.s.buf;
332 *size = sk->inbuf.s.datasize;
333 sk->inbuf.s.buf = NULL;
334 sk->inbuf.s.bufsize = sk->inbuf.s.datasize = 0;
337 if((dbuf = sk->inbuf.d.f) == NULL)
339 sk->inbuf.d.f = dbuf->next;
340 if(dbuf->next == NULL)
341 sk->inbuf.d.l = NULL;
351 static void recvcmsg(struct socket *sk, struct msghdr *msg)
353 struct cmsghdr *cmsg;
355 for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
357 #if UNIX_AUTH_STYLE == 1
358 if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS))
361 if(sk->ucred.uid == -1)
363 cred = (struct ucred *)CMSG_DATA(cmsg);
364 sk->ucred.uid = cred->uid;
365 sk->ucred.gid = cred->gid;
372 static void sockrecv(struct socket *sk)
375 struct dgrambuf *dbuf;
380 memset(&msg, 0, sizeof(msg));
381 msg.msg_iov = &bufvec;
383 msg.msg_control = cbuf;
384 msg.msg_controllen = sizeof(cbuf);
388 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
389 /* SIOCINQ is Linux-specific AFAIK, but I really have no idea
390 * how to read the inqueue size on other OSs */
391 if(sk->isrealsocket) {
392 if(ioctl(sk->fd, SIOCINQ, &inq))
394 /* I don't really know what could go wrong here, so let's
395 * assume it's transient. */
396 flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), sk->fd);
400 /* There are perils when trying to use SIOCINQ on files >2GiB... */
408 sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + inq, 1, 1);
411 bufvec.iov_base = sk->inbuf.s.buf + sk->inbuf.s.datasize;
412 bufvec.iov_len = inq;
413 ret = recvmsg(sk->fd, &msg, 0);
415 ret = read(sk->fd, sk->inbuf.s.buf + sk->inbuf.s.datasize, inq);
416 msg.msg_controllen = 0;
421 if((errno == EINTR) || (errno == EAGAIN))
423 if(sk->errcb != NULL)
424 sk->errcb(sk, errno, sk->data);
428 if(msg.msg_flags & MSG_CTRUNC)
429 flog(LOG_DEBUG, "ancillary data was truncated");
434 if(sk->errcb != NULL)
435 sk->errcb(sk, 0, sk->data);
439 sk->inbuf.s.datasize += ret;
440 if(sk->readcb != NULL)
441 sk->readcb(sk, sk->data);
444 #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ)
445 if(ioctl(sk->fd, SIOCINQ, &inq))
447 /* I don't really know what could go wrong here, so let's
448 * assume it's transient. */
449 flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), sk->fd);
455 dbuf = smalloc(sizeof(*dbuf));
456 dbuf->data = smalloc(inq);
457 dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage));
459 ret = recvfrom(sk->fd, dbuf->data, inq, 0, dbuf->addr, &dbuf->addrlen);
461 msg.msg_name = dbuf->addr;
462 msg.msg_namelen = dbuf->addrlen;
463 bufvec.iov_base = dbuf->data;
464 bufvec.iov_len = inq;
465 ret = recvmsg(sk->fd, &msg, 0);
466 dbuf->addrlen = msg.msg_namelen;
472 if((errno == EINTR) || (errno == EAGAIN))
474 if(sk->errcb != NULL)
475 sk->errcb(sk, errno, sk->data);
479 if(msg.msg_flags & MSG_CTRUNC)
480 flog(LOG_DEBUG, "ancillary data was truncated");
483 /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't
484 * have EOF), but rather an empty packet. I don't know if any
485 * other potential DGRAM protocols might have an EOF
486 * condition, so let's play safe. */
492 if(!((sk->family == AF_INET) || (sk->family == AF_INET6)))
494 if(sk->errcb != NULL)
495 sk->errcb(sk, 0, sk->data);
500 dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen);
501 dbuf->data = srealloc(dbuf->data, dbuf->size = ret);
503 if(sk->inbuf.d.l != NULL)
504 sk->inbuf.d.l->next = dbuf;
506 sk->inbuf.d.f = dbuf;
507 sk->inbuf.d.l = dbuf;
508 if(sk->readcb != NULL)
509 sk->readcb(sk, sk->data);
514 static void sockflush(struct socket *sk)
517 struct dgrambuf *dbuf;
523 ret = send(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL);
525 ret = write(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize);
528 /* For now, assume transient error, since
529 * the socket is polled for errors */
534 memmove(sk->outbuf.s.buf, ((char *)sk->outbuf.s.buf) + ret, sk->outbuf.s.datasize -= ret);
535 if(sk->writecb != NULL)
536 sk->writecb(sk, sk->data);
540 dbuf = sk->outbuf.d.f;
541 if((sk->outbuf.d.f = dbuf->next) == NULL)
542 sk->outbuf.d.l = NULL;
543 sendto(sk->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen);
547 if(sk->writecb != NULL)
548 sk->writecb(sk, sk->data);
553 void closesock(struct socket *sk)
555 struct sockaddr_un *un;
557 if((sk->family == AF_UNIX) && !sockgetlocalname(sk, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX))
559 if((sk->state == SOCK_LST) && strchr(un->sun_path, '/'))
561 if(unlink(un->sun_path))
562 flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno));
565 sk->state = SOCK_STL;
571 void sockqueue(struct socket *sk, void *data, size_t size)
573 struct dgrambuf *new;
575 if(sk->state == SOCK_STL)
580 sizebuf(&(sk->outbuf.s.buf), &(sk->outbuf.s.bufsize), sk->outbuf.s.datasize + size, 1, 1);
581 memcpy(sk->outbuf.s.buf + sk->outbuf.s.datasize, data, size);
582 sk->outbuf.s.datasize += size;
585 if(sk->remote == NULL)
587 new = smalloc(sizeof(*new));
589 memcpy(new->data = smalloc(size), data, new->size = size);
590 memcpy(new->addr = smalloc(sk->remotelen), sk->remote, new->addrlen = sk->remotelen);
591 if(sk->outbuf.d.l == NULL)
593 sk->outbuf.d.l = sk->outbuf.d.f = new;
595 sk->outbuf.d.l->next = new;
596 sk->outbuf.d.l = new;
602 size_t sockgetdatalen(struct socket *sk)
610 ret = sk->inbuf.s.datasize;
614 for(b = sk->inbuf.d.f; b != NULL; b = b->next)
621 size_t sockqueuesize(struct socket *sk)
629 ret = sk->outbuf.s.datasize;
633 for(b = sk->outbuf.d.f; b != NULL; b = b->next)
641 * Seriously, I don't know if it's naughty or not to remove
642 * pre-existing Unix sockets.
644 static int rebindunix(struct socket *sk, struct sockaddr *name, socklen_t namelen)
646 struct sockaddr_un *un;
649 if((sk->family != AF_UNIX) || (name->sa_family != PF_UNIX))
651 un = (struct sockaddr_un *)name;
652 if(stat(un->sun_path, &sb))
654 if(!S_ISSOCK(sb.st_mode))
656 if(unlink(un->sun_path))
658 if(bind(sk->fd, name, namelen) < 0)
664 * The difference between netcslisten() and netcslistenlocal() is that
665 * netcslistenlocal() always listens on the local host, instead of
666 * following proxy/passive mode directions. It is suitable for eg. the
667 * UI channel, while the file sharing networks should, naturally, use
668 * netcslisten() instead.
671 struct socket *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data)
676 /* I don't know if this is actually correct (it probably isn't),
677 * but since, at on least Linux systems, PF_* are specifically
678 * #define'd to their AF_* counterparts, it allows for a severely
679 * smoother implementation. If it breaks something on your
680 * platform, please tell me so.
682 if((sk = mksock(name->sa_family, type)) == NULL)
684 sk->state = SOCK_LST;
685 if(confgetint("net", "reuseaddr"))
688 setsockopt(sk->fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf));
690 if((bind(sk->fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(sk, name, namelen) < 0)))
695 if(listen(sk->fd, 16) < 0)
705 struct socket *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data)
707 if(confgetint("net", "mode") == 1)
712 if(confgetint("net", "mode") == 0)
713 return(netcslistenlocal(type, name, namelen, func, data));
718 struct socket *netcstcplisten(int port, int local, void (*func)(struct socket *, struct socket *, void *), void *data)
720 struct sockaddr_in addr;
722 struct sockaddr_in6 addr6;
724 struct socket *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct socket *, struct socket *, void *), void *);
728 csfunc = netcslistenlocal;
730 csfunc = netcslisten;
732 memset(&addr6, 0, sizeof(addr6));
733 addr6.sin6_family = AF_INET6;
734 addr6.sin6_port = htons(port);
735 addr6.sin6_addr = in6addr_any;
736 if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL)
738 if((ret == NULL) && (errno != EAFNOSUPPORT))
741 memset(&addr, 0, sizeof(addr));
742 addr.sin_family = AF_INET;
743 addr.sin_port = htons(port);
744 return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data));
747 struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen)
752 mode = confgetint("net", "mode");
753 if((mode == 0) || (mode == 1))
755 if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL)
757 if(bind(sk->fd, name, namelen) < 0)
762 sk->state = SOCK_EST;
769 struct socket *netdupsock(struct socket *sk)
771 struct socket *newsk;
773 newsk = newsock(sk->type);
774 if((newsk->fd = dup(sk->fd)) < 0)
776 flog(LOG_WARNING, "could not dup() socket: %s", strerror(errno));
780 newsk->state = sk->state;
781 newsk->ignread = sk->ignread;
782 if(sk->remote != NULL)
783 memcpy(newsk->remote = smalloc(sk->remotelen), sk->remote, newsk->remotelen = sk->remotelen);
787 void netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen)
789 if(sk->remote != NULL)
791 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
795 struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data)
800 mode = confgetint("net", "mode");
801 if((mode == 0) || (mode == 1))
803 if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL)
805 memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen);
806 if(!connect(sk->fd, addr, addrlen))
808 sk->state = SOCK_EST;
812 if(errno == EINPROGRESS)
814 sk->state = SOCK_SYN;
826 static void acceptunix(struct socket *sk)
831 #if UNIX_AUTH_STYLE == 1
832 if(setsockopt(sk->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0)
833 flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", sk->fd, strerror(errno));
834 #elif UNIX_AUTH_STYLE == 2
835 if(getpeereid(sk->fd, &sk->ucred.uid, &sk->ucred.gid) < 0)
837 flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", sk->fd, strerror(errno));
844 int pollsocks(int timeout)
849 fd_set rfds, wfds, efds;
850 struct socket *sk, *next, *newsk;
851 struct sockaddr_storage ss;
858 for(maxfd = 0, sk = sockets; sk != NULL; sk = sk->next)
860 if((sk->state == SOCK_STL) || (sk->fd < 0))
863 FD_SET(sk->fd, &rfds);
864 if((sk->state == SOCK_SYN) || (sockqueuesize(sk) > 0))
865 FD_SET(sk->fd, &wfds);
866 FD_SET(sk->fd, &efds);
870 tv.tv_sec = timeout / 1000;
871 tv.tv_usec = (timeout % 1000) * 1000;
872 ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv);
877 flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno));
878 /* To avoid CPU hogging in case it's bad, which it
884 for(sk = sockets; sk != NULL; sk = next)
891 if(FD_ISSET(fd, &rfds))
894 if((newfd = accept(fd, (struct sockaddr *)&ss, &sslen)) < 0)
896 if(sk->errcb != NULL)
897 sk->errcb(sk, errno, sk->data);
899 newsk = newsock(sk->type);
901 newsk->family = sk->family;
902 newsk->state = SOCK_EST;
903 memcpy(newsk->remote = smalloc(sslen), &ss, sslen);
904 newsk->remotelen = sslen;
905 if(ss.ss_family == PF_UNIX)
907 if(sk->acceptcb != NULL)
908 sk->acceptcb(sk, newsk, sk->data);
911 if(FD_ISSET(fd, &efds))
913 retlen = sizeof(ret);
914 getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
915 if(sk->errcb != NULL)
916 sk->errcb(sk, ret, sk->data);
921 if(FD_ISSET(fd, &efds))
923 retlen = sizeof(ret);
924 getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
925 if(sk->conncb != NULL)
926 sk->conncb(sk, ret, sk->data);
930 if(FD_ISSET(fd, &rfds) || FD_ISSET(fd, &wfds))
932 sk->state = SOCK_EST;
933 if(sk->conncb != NULL)
934 sk->conncb(sk, 0, sk->data);
938 if(FD_ISSET(fd, &efds))
940 retlen = sizeof(ret);
941 getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen);
942 if(sk->errcb != NULL)
943 sk->errcb(sk, ret, sk->data);
947 if(FD_ISSET(fd, &rfds))
949 if(FD_ISSET(fd, &wfds))
951 if(sockqueuesize(sk) > 0)
957 for(sk = sockets; sk != NULL; sk = next)
960 if(sk->refcount == 1 && (sockqueuesize(sk) == 0))
965 if(sk->close && (sockqueuesize(sk) == 0))
967 if(sk->state == SOCK_STL)
976 int socksettos(struct socket *sk, int tos)
980 if(sk->family == AF_UNIX)
981 return(0); /* Unix sockets are always perfect. :) */
982 if(sk->family == AF_INET)
989 case SOCK_TOS_MINCOST:
992 case SOCK_TOS_MAXREL:
998 case SOCK_TOS_MINDELAY:
1002 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1005 if(setsockopt(sk->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0)
1007 flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno));
1012 if(sk->family == AF_INET6)
1018 case SOCK_TOS_MINCOST:
1019 buf = confgetint("net", "diffserv-mincost");
1021 case SOCK_TOS_MAXREL:
1022 buf = confgetint("net", "diffserv-maxrel");
1024 case SOCK_TOS_MAXTP:
1025 buf = confgetint("net", "diffserv-maxtp");
1027 case SOCK_TOS_MINDELAY:
1028 buf = confgetint("net", "diffserv-mindelay");
1031 flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos);
1035 On Linux, the API IPv6 flow label management doesn't seem to
1036 be entirely complete, so I guess this will have to wait.
1038 if(setsockopt(...) < 0)
1040 flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno));
1046 flog(LOG_WARNING, "could not set TOS on sock of family %i", sk->family);
1053 void (*callback)(struct sockaddr *addr, int addrlen, void *data);
1055 struct sockaddr_storage addr;
1059 static void resolvecb(pid_t pid, int status, struct resolvedata *data)
1061 static char buf[80];
1063 struct sockaddr_in *ipv4;
1067 if((ret = read(data->fd, buf, sizeof(buf))) != 4)
1070 data->callback(NULL, 0, data->data);
1072 ipv4 = (struct sockaddr_in *)&data->addr;
1073 memcpy(&ipv4->sin_addr, buf, 4);
1074 data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data);
1078 data->callback(NULL, 0, data->data);
1084 int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data)
1091 struct resolvedata *rdata;
1092 struct sockaddr_in ipv4;
1098 if((p = strchr(addr, ':')) != NULL)
1103 ipv4.sin_family = AF_INET;
1104 ipv4.sin_port = htons(port);
1105 if(inet_aton(addr, &ipv4.sin_addr))
1107 callback((struct sockaddr *)&ipv4, sizeof(ipv4), data);
1109 sigemptyset(&sigset);
1110 sigaddset(&sigset, SIGCHLD);
1111 sigprocmask(SIG_BLOCK, &sigset, NULL);
1112 if((pipe(pfd) < 0) || ((child = fork()) < 0))
1114 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1119 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1120 for(i = 3; i < FD_SETSIZE; i++)
1125 signal(SIGALRM, SIG_DFL);
1127 if((he = gethostbyname(addr)) == NULL)
1129 write(pfd[1], he->h_addr_list[0], 4);
1133 fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK);
1134 rdata = smalloc(sizeof(*rdata));
1136 rdata->callback = callback;
1138 memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4));
1139 childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata);
1140 sigprocmask(SIG_UNBLOCK, &sigset, NULL);
1147 int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1150 struct sockaddr_storage name;
1153 if((sk->state == SOCK_STL) || (sk->fd < 0))
1156 if(getsockname(sk->fd, (struct sockaddr *)&name, &len) < 0)
1158 flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno));
1161 *namebuf = memcpy(smalloc(len), &name, len);
1167 static void sethostaddr(struct sockaddr *dst, struct sockaddr *src)
1169 if(dst->sa_family != src->sa_family)
1171 flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family);
1174 switch(src->sa_family)
1177 ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr;
1180 ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr;
1183 flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family);
1188 static int makepublic(struct sockaddr *addr)
1192 struct sockaddr *pname;
1194 if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0)
1196 flog(LOG_ERR, "could not get public address: %s", strerror(errno));
1201 sethostaddr(addr, pname);
1206 int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf)
1209 struct sockaddr *name;
1211 switch(confgetint("net", "mode"))
1215 if((sk->state == SOCK_STL) || (sk->fd < 0))
1220 if(!sockgetlocalname(sk, &name, &len))
1227 flog(LOG_ERR, "could not get remotely accessible name by any means");
1233 flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode"));
1239 int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf)
1241 struct sockaddr *name1, *name2;
1242 socklen_t len1, len2;
1244 if(sk->family != sk2->family)
1246 flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", sk->family, sk2->family);
1249 if(sockgetremotename(sk, &name1, &len1))
1251 if(sockgetremotename(sk2, &name2, &len2)) {
1255 sethostaddr(name1, name2);
1262 int addreq(struct sockaddr *x, struct sockaddr *y)
1264 struct sockaddr_un *u1, *u2;
1265 struct sockaddr_in *n1, *n2;
1267 struct sockaddr_in6 *s1, *s2;
1270 if(x->sa_family != y->sa_family)
1272 switch(x->sa_family) {
1274 u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y;
1275 if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path)))
1279 n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y;
1280 if(n1->sin_port != n2->sin_port)
1282 if(n1->sin_addr.s_addr != n2->sin_addr.s_addr)
1287 s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y;
1288 if(s1->sin6_port != s2->sin6_port)
1290 if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr)))
1298 char *formataddress(struct sockaddr *arg, socklen_t arglen)
1300 struct sockaddr_in *ipv4;
1302 struct sockaddr_in6 *ipv6;
1304 static char *ret = NULL;
1310 switch(arg->sa_family)
1313 ret = sstrdup("Unix socket");
1316 ipv4 = (struct sockaddr_in *)arg;
1317 if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL)
1319 ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port));
1323 ipv6 = (struct sockaddr_in6 *)arg;
1324 if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL)
1326 ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port));
1330 errno = EPFNOSUPPORT;
1339 * It was very nice to use this, but it seems
1340 * to mess things up, so I guess it has to go... :-(
1343 static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args)
1345 struct sockaddr *arg;
1347 struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with
1348 * lowercase letters to 1, so I do this
1350 struct sockaddr_in *ipv4;
1353 arg = *(struct sockaddr **)(args[0]);
1354 arglen = *(socklen_t *)(args[1]);
1355 switch(arg->sa_family)
1358 UNIX = (struct sockaddr_un *)arg;
1359 ret = fprintf(stream, "%s", UNIX->sun_path);
1362 ipv4 = (struct sockaddr_in *)arg;
1363 ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port));
1367 errno = EPFNOSUPPORT;
1373 static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes)
1376 argtypes[0] = PA_POINTER;
1378 argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_
1379 * be an int, so I guess this should be
1385 static int init(int hup)
1390 if(register_printf_function('N', formataddress, formataddress_arginfo))
1392 flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno));
1400 static void terminate(void)
1402 while(sockets != NULL)
1403 unlinksock(sockets);
1406 static struct module me =
1414 .terminate = terminate