./tools/notsd-move

1 files changed, 419 insertions, 0 deletions

diff --git a/src/grp-resolve/systemd-resolved/resolved-dns-stream.c b/src/grp-resolve/systemd-resolved/resolved-dns-stream.c
new file mode 100644
index 0000000000..5f77d47f64
--- /dev/null
+++ b/src/grp-resolve/systemd-resolved/resolved-dns-stream.c
@@ -0,0 +1,419 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <netinet/tcp.h>
+
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/io-util.h"
+#include "systemd-basic/missing.h"
+
+#include "resolved-dns-stream.h"
+
+#define DNS_STREAM_TIMEOUT_USEC (10 * USEC_PER_SEC)
+#define DNS_STREAMS_MAX 128
+
+static void dns_stream_stop(DnsStream *s) {
+        assert(s);
+
+        s->io_event_source = sd_event_source_unref(s->io_event_source);
+        s->timeout_event_source = sd_event_source_unref(s->timeout_event_source);
+        s->fd = safe_close(s->fd);
+}
+
+static int dns_stream_update_io(DnsStream *s) {
+        int f = 0;
+
+        assert(s);
+
+        if (s->write_packet && s->n_written < sizeof(s->write_size) + s->write_packet->size)
+                f |= EPOLLOUT;
+        if (!s->read_packet || s->n_read < sizeof(s->read_size) + s->read_packet->size)
+                f |= EPOLLIN;
+
+        return sd_event_source_set_io_events(s->io_event_source, f);
+}
+
+static int dns_stream_complete(DnsStream *s, int error) {
+        assert(s);
+
+        dns_stream_stop(s);
+
+        if (s->complete)
+                s->complete(s, error);
+        else /* the default action if no completion function is set is to close the stream */
+                dns_stream_unref(s);
+
+        return 0;
+}
+
+static int dns_stream_identify(DnsStream *s) {
+        union {
+                struct cmsghdr header; /* For alignment */
+                uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
+                               + EXTRA_CMSG_SPACE /* kernel appears to require extra space */];
+        } control;
+        struct msghdr mh = {};
+        struct cmsghdr *cmsg;
+        socklen_t sl;
+        int r;
+
+        assert(s);
+
+        if (s->identified)
+                return 0;
+
+        /* Query the local side */
+        s->local_salen = sizeof(s->local);
+        r = getsockname(s->fd, &s->local.sa, &s->local_salen);
+        if (r < 0)
+                return -errno;
+        if (s->local.sa.sa_family == AF_INET6 && s->ifindex <= 0)
+                s->ifindex = s->local.in6.sin6_scope_id;
+
+        /* Query the remote side */
+        s->peer_salen = sizeof(s->peer);
+        r = getpeername(s->fd, &s->peer.sa, &s->peer_salen);
+        if (r < 0)
+                return -errno;
+        if (s->peer.sa.sa_family == AF_INET6 && s->ifindex <= 0)
+                s->ifindex = s->peer.in6.sin6_scope_id;
+
+        /* Check consistency */
+        assert(s->peer.sa.sa_family == s->local.sa.sa_family);
+        assert(IN_SET(s->peer.sa.sa_family, AF_INET, AF_INET6));
+
+        /* Query connection meta information */
+        sl = sizeof(control);
+        if (s->peer.sa.sa_family == AF_INET) {
+                r = getsockopt(s->fd, IPPROTO_IP, IP_PKTOPTIONS, &control, &sl);
+                if (r < 0)
+                        return -errno;
+        } else if (s->peer.sa.sa_family == AF_INET6) {
+
+                r = getsockopt(s->fd, IPPROTO_IPV6, IPV6_2292PKTOPTIONS, &control, &sl);
+                if (r < 0)
+                        return -errno;
+        } else
+                return -EAFNOSUPPORT;
+
+        mh.msg_control = &control;
+        mh.msg_controllen = sl;
+
+        CMSG_FOREACH(cmsg, &mh) {
+
+                if (cmsg->cmsg_level == IPPROTO_IPV6) {
+                        assert(s->peer.sa.sa_family == AF_INET6);
+
+                        switch (cmsg->cmsg_type) {
+
+                        case IPV6_PKTINFO: {
+                                struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
+
+                                if (s->ifindex <= 0)
+                                        s->ifindex = i->ipi6_ifindex;
+                                break;
+                        }
+
+                        case IPV6_HOPLIMIT:
+                                s->ttl = *(int *) CMSG_DATA(cmsg);
+                                break;
+                        }
+
+                } else if (cmsg->cmsg_level == IPPROTO_IP) {
+                        assert(s->peer.sa.sa_family == AF_INET);
+
+                        switch (cmsg->cmsg_type) {
+
+                        case IP_PKTINFO: {
+                                struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
+
+                                if (s->ifindex <= 0)
+                                        s->ifindex = i->ipi_ifindex;
+                                break;
+                        }
+
+                        case IP_TTL:
+                                s->ttl = *(int *) CMSG_DATA(cmsg);
+                                break;
+                        }
+                }
+        }
+
+        /* The Linux kernel sets the interface index to the loopback
+         * device if the connection came from the local host since it
+         * avoids the routing table in such a case. Let's unset the
+         * interface index in such a case. */
+        if (s->ifindex == LOOPBACK_IFINDEX)
+                s->ifindex = 0;
+
+        /* If we don't know the interface index still, we look for the
+         * first local interface with a matching address. Yuck! */
+        if (s->ifindex <= 0)
+                s->ifindex = manager_find_ifindex(s->manager, s->local.sa.sa_family, s->local.sa.sa_family == AF_INET ? (union in_addr_union*) &s->local.in.sin_addr : (union in_addr_union*)  &s->local.in6.sin6_addr);
+
+        if (s->protocol == DNS_PROTOCOL_LLMNR && s->ifindex > 0) {
+                uint32_t ifindex = htobe32(s->ifindex);
+
+                /* Make sure all packets for this connection are sent on the same interface */
+                if (s->local.sa.sa_family == AF_INET) {
+                        r = setsockopt(s->fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex, sizeof(ifindex));
+                        if (r < 0)
+                                log_debug_errno(errno, "Failed to invoke IP_UNICAST_IF: %m");
+                } else if (s->local.sa.sa_family == AF_INET6) {
+                        r = setsockopt(s->fd, IPPROTO_IPV6, IPV6_UNICAST_IF, &ifindex, sizeof(ifindex));
+                        if (r < 0)
+                                log_debug_errno(errno, "Failed to invoke IPV6_UNICAST_IF: %m");
+                }
+        }
+
+        s->identified = true;
+
+        return 0;
+}
+
+static int on_stream_timeout(sd_event_source *es, usec_t usec, void *userdata) {
+        DnsStream *s = userdata;
+
+        assert(s);
+
+        return dns_stream_complete(s, ETIMEDOUT);
+}
+
+static int on_stream_io(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
+        DnsStream *s = userdata;
+        int r;
+
+        assert(s);
+
+        r = dns_stream_identify(s);
+        if (r < 0)
+                return dns_stream_complete(s, -r);
+
+        if ((revents & EPOLLOUT) &&
+            s->write_packet &&
+            s->n_written < sizeof(s->write_size) + s->write_packet->size) {
+
+                struct iovec iov[2];
+                ssize_t ss;
+
+                iov[0].iov_base = &s->write_size;
+                iov[0].iov_len = sizeof(s->write_size);
+                iov[1].iov_base = DNS_PACKET_DATA(s->write_packet);
+                iov[1].iov_len = s->write_packet->size;
+
+                IOVEC_INCREMENT(iov, 2, s->n_written);
+
+                ss = writev(fd, iov, 2);
+                if (ss < 0) {
+                        if (errno != EINTR && errno != EAGAIN)
+                                return dns_stream_complete(s, errno);
+                } else
+                        s->n_written += ss;
+
+                /* Are we done? If so, disable the event source for EPOLLOUT */
+                if (s->n_written >= sizeof(s->write_size) + s->write_packet->size) {
+                        r = dns_stream_update_io(s);
+                        if (r < 0)
+                                return dns_stream_complete(s, -r);
+                }
+        }
+
+        if ((revents & (EPOLLIN|EPOLLHUP|EPOLLRDHUP)) &&
+            (!s->read_packet ||
+             s->n_read < sizeof(s->read_size) + s->read_packet->size)) {
+
+                if (s->n_read < sizeof(s->read_size)) {
+                        ssize_t ss;
+
+                        ss = read(fd, (uint8_t*) &s->read_size + s->n_read, sizeof(s->read_size) - s->n_read);
+                        if (ss < 0) {
+                                if (errno != EINTR && errno != EAGAIN)
+                                        return dns_stream_complete(s, errno);
+                        } else if (ss == 0)
+                                return dns_stream_complete(s, ECONNRESET);
+                        else
+                                s->n_read += ss;
+                }
+
+                if (s->n_read >= sizeof(s->read_size)) {
+
+                        if (be16toh(s->read_size) < DNS_PACKET_HEADER_SIZE)
+                                return dns_stream_complete(s, EBADMSG);
+
+                        if (s->n_read < sizeof(s->read_size) + be16toh(s->read_size)) {
+                                ssize_t ss;
+
+                                if (!s->read_packet) {
+                                        r = dns_packet_new(&s->read_packet, s->protocol, be16toh(s->read_size));
+                                        if (r < 0)
+                                                return dns_stream_complete(s, -r);
+
+                                        s->read_packet->size = be16toh(s->read_size);
+                                        s->read_packet->ipproto = IPPROTO_TCP;
+                                        s->read_packet->family = s->peer.sa.sa_family;
+                                        s->read_packet->ttl = s->ttl;
+                                        s->read_packet->ifindex = s->ifindex;
+
+                                        if (s->read_packet->family == AF_INET) {
+                                                s->read_packet->sender.in = s->peer.in.sin_addr;
+                                                s->read_packet->sender_port = be16toh(s->peer.in.sin_port);
+                                                s->read_packet->destination.in = s->local.in.sin_addr;
+                                                s->read_packet->destination_port = be16toh(s->local.in.sin_port);
+                                        } else {
+                                                assert(s->read_packet->family == AF_INET6);
+                                                s->read_packet->sender.in6 = s->peer.in6.sin6_addr;
+                                                s->read_packet->sender_port = be16toh(s->peer.in6.sin6_port);
+                                                s->read_packet->destination.in6 = s->local.in6.sin6_addr;
+                                                s->read_packet->destination_port = be16toh(s->local.in6.sin6_port);
+
+                                                if (s->read_packet->ifindex == 0)
+                                                        s->read_packet->ifindex = s->peer.in6.sin6_scope_id;
+                                                if (s->read_packet->ifindex == 0)
+                                                        s->read_packet->ifindex = s->local.in6.sin6_scope_id;
+                                        }
+                                }
+
+                                ss = read(fd,
+                                          (uint8_t*) DNS_PACKET_DATA(s->read_packet) + s->n_read - sizeof(s->read_size),
+                                          sizeof(s->read_size) + be16toh(s->read_size) - s->n_read);
+                                if (ss < 0) {
+                                        if (errno != EINTR && errno != EAGAIN)
+                                                return dns_stream_complete(s, errno);
+                                } else if (ss == 0)
+                                        return dns_stream_complete(s, ECONNRESET);
+                                else
+                                        s->n_read += ss;
+                        }
+
+                        /* Are we done? If so, disable the event source for EPOLLIN */
+                        if (s->n_read >= sizeof(s->read_size) + be16toh(s->read_size)) {
+                                r = dns_stream_update_io(s);
+                                if (r < 0)
+                                        return dns_stream_complete(s, -r);
+
+                                /* If there's a packet handler
+                                 * installed, call that. Note that
+                                 * this is optional... */
+                                if (s->on_packet)
+                                        return s->on_packet(s);
+                        }
+                }
+        }
+
+        if ((s->write_packet && s->n_written >= sizeof(s->write_size) + s->write_packet->size) &&
+            (s->read_packet && s->n_read >= sizeof(s->read_size) + s->read_packet->size))
+                return dns_stream_complete(s, 0);
+
+        return 0;
+}
+
+DnsStream *dns_stream_unref(DnsStream *s) {
+        if (!s)
+                return NULL;
+
+        assert(s->n_ref > 0);
+        s->n_ref--;
+
+        if (s->n_ref > 0)
+                return NULL;
+
+        dns_stream_stop(s);
+
+        if (s->manager) {
+                LIST_REMOVE(streams, s->manager->dns_streams, s);
+                s->manager->n_dns_streams--;
+        }
+
+        dns_packet_unref(s->write_packet);
+        dns_packet_unref(s->read_packet);
+
+        return mfree(s);
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(DnsStream*, dns_stream_unref);
+
+DnsStream *dns_stream_ref(DnsStream *s) {
+        if (!s)
+                return NULL;
+
+        assert(s->n_ref > 0);
+        s->n_ref++;
+
+        return s;
+}
+
+int dns_stream_new(Manager *m, DnsStream **ret, DnsProtocol protocol, int fd) {
+        _cleanup_(dns_stream_unrefp) DnsStream *s = NULL;
+        int r;
+
+        assert(m);
+        assert(fd >= 0);
+
+        if (m->n_dns_streams > DNS_STREAMS_MAX)
+                return -EBUSY;
+
+        s = new0(DnsStream, 1);
+        if (!s)
+                return -ENOMEM;
+
+        s->n_ref = 1;
+        s->fd = -1;
+        s->protocol = protocol;
+
+        r = sd_event_add_io(m->event, &s->io_event_source, fd, EPOLLIN, on_stream_io, s);
+        if (r < 0)
+                return r;
+
+        (void) sd_event_source_set_description(s->io_event_source, "dns-stream-io");
+
+        r = sd_event_add_time(
+                        m->event,
+                        &s->timeout_event_source,
+                        clock_boottime_or_monotonic(),
+                        now(clock_boottime_or_monotonic()) + DNS_STREAM_TIMEOUT_USEC, 0,
+                        on_stream_timeout, s);
+        if (r < 0)
+                return r;
+
+        (void) sd_event_source_set_description(s->timeout_event_source, "dns-stream-timeout");
+
+        LIST_PREPEND(streams, m->dns_streams, s);
+        s->manager = m;
+        s->fd = fd;
+        m->n_dns_streams++;
+
+        *ret = s;
+        s = NULL;
+
+        return 0;
+}
+
+int dns_stream_write_packet(DnsStream *s, DnsPacket *p) {
+        assert(s);
+
+        if (s->write_packet)
+                return -EBUSY;
+
+        s->write_packet = dns_packet_ref(p);
+        s->write_size = htobe16(p->size);
+        s->n_written = 0;
+
+        return dns_stream_update_io(s);
+}