+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
- Copyright 2013 Daniel Mack
- Copyright 2014 Kay Sievers
- Copyright 2014 David Herrmann
-
- 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 <sys/socket.h>
-#include <sys/types.h>
-#include <string.h>
-#include <errno.h>
-#include <poll.h>
-
-#include "log.h"
-#include "util.h"
-#include "sd-daemon.h"
-#include "sd-bus.h"
-#include "bus-internal.h"
-#include "bus-message.h"
-#include "bus-util.h"
-#include "strv.h"
-#include "bus-control.h"
-#include "set.h"
-#include "bus-xml-policy.h"
-#include "driver.h"
-#include "proxy.h"
-#include "synthesize.h"
-
-static int proxy_create_destination(Proxy *p, const char *destination, const char *local_sec, bool negotiate_fds) {
- _cleanup_bus_close_unref_ sd_bus *b = NULL;
- int r;
-
- r = sd_bus_new(&b);
- if (r < 0)
- return log_error_errno(r, "Failed to allocate bus: %m");
-
- r = sd_bus_set_description(b, "sd-proxy");
- if (r < 0)
- return log_error_errno(r, "Failed to set bus name: %m");
-
- r = sd_bus_set_address(b, destination);
- if (r < 0)
- return log_error_errno(r, "Failed to set address to connect to: %m");
-
- r = sd_bus_negotiate_fds(b, negotiate_fds);
- if (r < 0)
- return log_error_errno(r, "Failed to set FD negotiation: %m");
-
- r = sd_bus_negotiate_creds(b, true, SD_BUS_CREDS_EUID|SD_BUS_CREDS_PID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SELINUX_CONTEXT);
- if (r < 0)
- return log_error_errno(r, "Failed to set credential negotiation: %m");
-
- if (p->local_creds.pid > 0) {
- b->fake_pids.pid = p->local_creds.pid;
- b->fake_pids_valid = true;
-
- b->fake_creds.uid = UID_INVALID;
- b->fake_creds.euid = p->local_creds.uid;
- b->fake_creds.suid = UID_INVALID;
- b->fake_creds.fsuid = UID_INVALID;
- b->fake_creds.gid = GID_INVALID;
- b->fake_creds.egid = p->local_creds.gid;
- b->fake_creds.sgid = GID_INVALID;
- b->fake_creds.fsgid = GID_INVALID;
- b->fake_creds_valid = true;
- }
-
- if (local_sec) {
- b->fake_label = strdup(local_sec);
- if (!b->fake_label)
- return log_oom();
- }
-
- b->manual_peer_interface = true;
-
- r = sd_bus_start(b);
- if (r < 0)
- return log_error_errno(r, "Failed to start bus client: %m");
-
- p->destination_bus = b;
- b = NULL;
- return 0;
-}
-
-static int proxy_create_local(Proxy *p, int in_fd, int out_fd, bool negotiate_fds) {
- _cleanup_bus_close_unref_ sd_bus *b = NULL;
- sd_id128_t server_id;
- int r;
-
- r = sd_bus_new(&b);
- if (r < 0)
- return log_error_errno(r, "Failed to allocate bus: %m");
-
- r = sd_bus_set_fd(b, in_fd, out_fd);
- if (r < 0)
- return log_error_errno(r, "Failed to set fds: %m");
-
- r = sd_bus_get_bus_id(p->destination_bus, &server_id);
- if (r < 0)
- return log_error_errno(r, "Failed to get server ID: %m");
-
- r = sd_bus_set_server(b, 1, server_id);
- if (r < 0)
- return log_error_errno(r, "Failed to set server mode: %m");
-
- r = sd_bus_negotiate_fds(b, negotiate_fds);
- if (r < 0)
- return log_error_errno(r, "Failed to set FD negotiation: %m");
-
- r = sd_bus_negotiate_creds(b, true, SD_BUS_CREDS_EUID|SD_BUS_CREDS_PID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SELINUX_CONTEXT);
- if (r < 0)
- return log_error_errno(r, "Failed to set credential negotiation: %m");
-
- r = sd_bus_set_anonymous(b, true);
- if (r < 0)
- return log_error_errno(r, "Failed to set anonymous authentication: %m");
-
- b->manual_peer_interface = true;
-
- r = sd_bus_start(b);
- if (r < 0)
- return log_error_errno(r, "Failed to start bus client: %m");
-
- p->local_bus = b;
- b = NULL;
- return 0;
-}
-
-static int proxy_prepare_matches(Proxy *p) {
- _cleanup_free_ char *match = NULL;
- const char *unique;
- int r;
-
- if (!p->destination_bus->is_kernel)
- return 0;
-
- r = sd_bus_get_unique_name(p->destination_bus, &unique);
- if (r < 0)
- return log_error_errno(r, "Failed to get unique name: %m");
-
- match = strjoin("type='signal',"
- "sender='org.freedesktop.DBus',"
- "path='/org/freedesktop/DBus',"
- "interface='org.freedesktop.DBus',"
- "member='NameOwnerChanged',"
- "arg1='",
- unique,
- "'",
- NULL);
- if (!match)
- return log_oom();
-
- r = sd_bus_add_match(p->destination_bus, NULL, match, NULL, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to add match for NameLost: %m");
-
- free(match);
- match = strjoin("type='signal',"
- "sender='org.freedesktop.DBus',"
- "path='/org/freedesktop/DBus',"
- "interface='org.freedesktop.DBus',"
- "member='NameOwnerChanged',"
- "arg2='",
- unique,
- "'",
- NULL);
- if (!match)
- return log_oom();
-
- r = sd_bus_add_match(p->destination_bus, NULL, match, NULL, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to add match for NameAcquired: %m");
-
- return 0;
-}
-
-int proxy_new(Proxy **out, int in_fd, int out_fd, const char *destination) {
- _cleanup_(proxy_freep) Proxy *p = NULL;
- _cleanup_free_ char *local_sec = NULL;
- bool is_unix;
- int r;
-
- p = new0(Proxy, 1);
- if (!p)
- return log_oom();
-
- p->local_in = in_fd;
- p->local_out = out_fd;
-
- p->owned_names = set_new(&string_hash_ops);
- if (!p->owned_names)
- return log_oom();
-
- is_unix = sd_is_socket(in_fd, AF_UNIX, 0, 0) > 0 &&
- sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0;
-
- if (is_unix) {
- (void) getpeercred(in_fd, &p->local_creds);
- (void) getpeersec(in_fd, &local_sec);
- }
-
- r = proxy_create_destination(p, destination, local_sec, is_unix);
- if (r < 0)
- return r;
-
- r = proxy_create_local(p, in_fd, out_fd, is_unix);
- if (r < 0)
- return r;
-
- r = proxy_prepare_matches(p);
- if (r < 0)
- return r;
-
- *out = p;
- p = NULL;
- return 0;
-}
-
-Proxy *proxy_free(Proxy *p) {
- if (!p)
- return NULL;
-
- sd_bus_close_unrefp(&p->local_bus);
- sd_bus_close_unrefp(&p->destination_bus);
- set_free_free(p->owned_names);
- free(p);
-
- return NULL;
-}
-
-int proxy_set_policy(Proxy *p, SharedPolicy *sp, char **configuration) {
- _cleanup_strv_free_ char **strv = NULL;
- Policy *policy;
- int r;
-
- assert(p);
- assert(sp);
-
- /* no need to load legacy policy if destination is not kdbus */
- if (!p->destination_bus->is_kernel)
- return 0;
-
- p->policy = sp;
-
- policy = shared_policy_acquire(sp);
- if (policy) {
- /* policy already pre-loaded */
- shared_policy_release(sp, policy);
- return 0;
- }
-
- if (!configuration) {
- const char *scope;
-
- r = sd_bus_get_scope(p->destination_bus, &scope);
- if (r < 0)
- return log_error_errno(r, "Couldn't determine bus scope: %m");
-
- if (streq(scope, "system"))
- strv = strv_new("/etc/dbus-1/system.conf",
- "/etc/dbus-1/system.d/",
- "/etc/dbus-1/system-local.conf",
- NULL);
- else if (streq(scope, "user"))
- strv = strv_new("/etc/dbus-1/session.conf",
- "/etc/dbus-1/session.d/",
- "/etc/dbus-1/session-local.conf",
- NULL);
- else
- return log_error("Unknown scope %s, don't know which policy to load. Refusing.", scope);
-
- if (!strv)
- return log_oom();
-
- configuration = strv;
- }
-
- return shared_policy_preload(sp, configuration);
-}
-
-int proxy_hello_policy(Proxy *p, uid_t original_uid) {
- Policy *policy;
- int r = 0;
-
- assert(p);
-
- if (!p->policy)
- return 0;
-
- policy = shared_policy_acquire(p->policy);
-
- if (p->local_creds.uid == original_uid)
- log_debug("Permitting access, since bus owner matches bus client.");
- else if (policy_check_hello(policy, p->local_creds.uid, p->local_creds.gid))
- log_debug("Permitting access due to XML policy.");
- else
- r = log_error_errno(EPERM, "Policy denied connection.");
-
- shared_policy_release(p->policy, policy);
-
- return r;
-}
-
-static int proxy_wait(Proxy *p) {
- uint64_t timeout_destination, timeout_local, t;
- int events_destination, events_local, fd;
- struct timespec _ts, *ts;
- struct pollfd *pollfd;
- int r;
-
- assert(p);
-
- fd = sd_bus_get_fd(p->destination_bus);
- if (fd < 0)
- return log_error_errno(fd, "Failed to get fd: %m");
-
- events_destination = sd_bus_get_events(p->destination_bus);
- if (events_destination < 0)
- return log_error_errno(events_destination, "Failed to get events mask: %m");
-
- r = sd_bus_get_timeout(p->destination_bus, &timeout_destination);
- if (r < 0)
- return log_error_errno(r, "Failed to get timeout: %m");
-
- events_local = sd_bus_get_events(p->local_bus);
- if (events_local < 0)
- return log_error_errno(events_local, "Failed to get events mask: %m");
-
- r = sd_bus_get_timeout(p->local_bus, &timeout_local);
- if (r < 0)
- return log_error_errno(r, "Failed to get timeout: %m");
-
- t = timeout_destination;
- if (t == (uint64_t) -1 || (timeout_local != (uint64_t) -1 && timeout_local < timeout_destination))
- t = timeout_local;
-
- if (t == (uint64_t) -1)
- ts = NULL;
- else {
- usec_t nw;
-
- nw = now(CLOCK_MONOTONIC);
- if (t > nw)
- t -= nw;
- else
- t = 0;
-
- ts = timespec_store(&_ts, t);
- }
-
- pollfd = (struct pollfd[3]) {
- { .fd = fd, .events = events_destination, },
- { .fd = p->local_in, .events = events_local & POLLIN, },
- { .fd = p->local_out, .events = events_local & POLLOUT, },
- };
-
- r = ppoll(pollfd, 3, ts, NULL);
- if (r < 0)
- return log_error_errno(errno, "ppoll() failed: %m");
-
- return 0;
-}
-
-static int handle_policy_error(sd_bus_message *m, int r) {
- if (r == -ESRCH || r == -ENXIO)
- return synthetic_reply_method_errorf(m, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", m->destination);
-
- return r;
-}
-
-static int process_policy_unlocked(sd_bus *from, sd_bus *to, sd_bus_message *m, Policy *policy, const struct ucred *our_ucred, Set *owned_names) {
- int r;
-
- assert(from);
- assert(to);
- assert(m);
-
- if (!policy)
- return 0;
-
- /*
- * dbus-1 distinguishes expected and non-expected replies by tracking
- * method-calls and timeouts. By default, DENY rules are *NEVER* applied
- * on expected replies, unless explicitly specified. But we dont track
- * method-calls, thus, we cannot know whether a reply is expected.
- * Fortunately, the kdbus forbids non-expected replies, so we can safely
- * ignore any policy on those and let the kernel deal with it.
- *
- * TODO: To be correct, we should only ignore policy-tags that are
- * applied on non-expected replies. However, so far we don't parse those
- * tags so we let everything pass. I haven't seen a DENY policy tag on
- * expected-replies, ever, so don't bother..
- */
- if (m->reply_cookie > 0)
- return 0;
-
- if (from->is_kernel) {
- uid_t sender_uid = UID_INVALID;
- gid_t sender_gid = GID_INVALID;
- char **sender_names = NULL;
-
- /* Driver messages are always OK */
- if (streq_ptr(m->sender, "org.freedesktop.DBus"))
- return 0;
-
- /* The message came from the kernel, and is sent to our legacy client. */
- (void) sd_bus_creds_get_well_known_names(&m->creds, &sender_names);
-
- (void) sd_bus_creds_get_euid(&m->creds, &sender_uid);
- (void) sd_bus_creds_get_egid(&m->creds, &sender_gid);
-
- if (sender_uid == UID_INVALID || sender_gid == GID_INVALID) {
- _cleanup_bus_creds_unref_ sd_bus_creds *sender_creds = NULL;
-
- /* If the message came from another legacy
- * client, then the message creds will be
- * missing, simply because on legacy clients
- * per-message creds were unknown. In this
- * case, query the creds of the peer
- * instead. */
-
- r = bus_get_name_creds_kdbus(from, m->sender, SD_BUS_CREDS_EUID|SD_BUS_CREDS_EGID, true, &sender_creds);
- if (r < 0)
- return handle_policy_error(m, r);
-
- (void) sd_bus_creds_get_euid(sender_creds, &sender_uid);
- (void) sd_bus_creds_get_egid(sender_creds, &sender_gid);
- }
-
- /* First check whether the sender can send the message to our name */
- if (policy_check_send(policy, sender_uid, sender_gid, m->header->type, owned_names, NULL, m->path, m->interface, m->member, false, NULL) &&
- policy_check_recv(policy, our_ucred->uid, our_ucred->gid, m->header->type, NULL, sender_names, m->path, m->interface, m->member, false))
- return 0;
-
- /* Return an error back to the caller */
- if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
- return synthetic_reply_method_errorf(m, SD_BUS_ERROR_ACCESS_DENIED, "Access prohibited by XML receiver policy.");
-
- /* Return 1, indicating that the message shall not be processed any further */
- return 1;
- }
-
- if (to->is_kernel) {
- _cleanup_bus_creds_unref_ sd_bus_creds *destination_creds = NULL;
- uid_t destination_uid = UID_INVALID;
- gid_t destination_gid = GID_INVALID;
- const char *destination_unique = NULL;
- char **destination_names = NULL;
- char *n;
-
- /* Driver messages are always OK */
- if (streq_ptr(m->destination, "org.freedesktop.DBus"))
- return 0;
-
- /* The message came from the legacy client, and is sent to kdbus. */
- if (m->destination) {
- r = bus_get_name_creds_kdbus(to, m->destination,
- SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME|
- SD_BUS_CREDS_EUID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_PID,
- true, &destination_creds);
- if (r < 0)
- return handle_policy_error(m, r);
-
- r = sd_bus_creds_get_unique_name(destination_creds, &destination_unique);
- if (r < 0)
- return handle_policy_error(m, r);
-
- (void) sd_bus_creds_get_well_known_names(destination_creds, &destination_names);
-
- (void) sd_bus_creds_get_euid(destination_creds, &destination_uid);
- (void) sd_bus_creds_get_egid(destination_creds, &destination_gid);
- }
-
- /* First check if we (the sender) can send to this name */
- if (policy_check_send(policy, our_ucred->uid, our_ucred->gid, m->header->type, NULL, destination_names, m->path, m->interface, m->member, true, &n)) {
- if (n) {
- /* If we made a receiver decision, then remember which
- * name's policy we used, and to which unique ID it
- * mapped when we made the decision. Then, let's pass
- * this to the kernel when sending the message, so that
- * it refuses the operation should the name and unique
- * ID not map to each other anymore. */
-
- r = free_and_strdup(&m->destination_ptr, n);
- if (r < 0)
- return r;
-
- r = bus_kernel_parse_unique_name(destination_unique, &m->verify_destination_id);
- if (r < 0)
- return r;
- }
-
- if (sd_bus_message_is_signal(m, NULL, NULL)) {
- /* If we forward a signal from dbus-1 to kdbus,
- * we have no idea who the recipient is.
- * Therefore, we cannot apply any dbus-1
- * receiver policies that match on receiver
- * credentials. We know sd-bus always sets
- * KDBUS_MSG_SIGNAL, so the kernel applies
- * receiver policies to the message. Therefore,
- * skip policy checks in this case. */
- return 0;
- } else if (policy_check_recv(policy, destination_uid, destination_gid, m->header->type, owned_names, NULL, m->path, m->interface, m->member, true)) {
- return 0;
- }
- }
-
- /* Return an error back to the caller */
- if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
- return synthetic_reply_method_errorf(m, SD_BUS_ERROR_ACCESS_DENIED, "Access prohibited by XML sender policy.");
-
- /* Return 1, indicating that the message shall not be processed any further */
- return 1;
- }
-
- return 0;
-}
-
-static int process_policy(sd_bus *from, sd_bus *to, sd_bus_message *m, SharedPolicy *sp, const struct ucred *our_ucred, Set *owned_names) {
- Policy *policy;
- int r;
-
- assert(sp);
-
- policy = shared_policy_acquire(sp);
- r = process_policy_unlocked(from, to, m, policy, our_ucred, owned_names);
- shared_policy_release(sp, policy);
-
- return r;
-}
-
-static int process_hello(Proxy *p, sd_bus_message *m) {
- _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
- bool is_hello;
- int r;
-
- assert(p);
- assert(m);
-
- /* As reaction to hello we need to respond with two messages:
- * the callback reply and the NameAcquired for the unique
- * name, since hello is otherwise obsolete on kdbus. */
-
- is_hello =
- sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "Hello") &&
- streq_ptr(m->destination, "org.freedesktop.DBus");
-
- if (!is_hello) {
- if (p->got_hello)
- return 0;
-
- return log_error_errno(EIO, "First packet isn't hello (it's %s.%s), aborting.", m->interface, m->member);
- }
-
- if (p->got_hello)
- return log_error_errno(EIO, "Got duplicate hello, aborting.");
-
- p->got_hello = true;
-
- if (!p->destination_bus->is_kernel)
- return 0;
-
- r = sd_bus_message_new_method_return(m, &n);
- if (r < 0)
- return log_error_errno(r, "Failed to generate HELLO reply: %m");
-
- r = sd_bus_message_append(n, "s", p->destination_bus->unique_name);
- if (r < 0)
- return log_error_errno(r, "Failed to append unique name to HELLO reply: %m");
-
- r = bus_message_append_sender(n, "org.freedesktop.DBus");
- if (r < 0)
- return log_error_errno(r, "Failed to append sender to HELLO reply: %m");
-
- r = bus_seal_synthetic_message(p->local_bus, n);
- if (r < 0)
- return log_error_errno(r, "Failed to seal HELLO reply: %m");
-
- r = sd_bus_send(p->local_bus, n, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to send HELLO reply: %m");
-
- n = sd_bus_message_unref(n);
- r = sd_bus_message_new_signal(
- p->local_bus,
- &n,
- "/org/freedesktop/DBus",
- "org.freedesktop.DBus",
- "NameAcquired");
- if (r < 0)
- return log_error_errno(r, "Failed to allocate initial NameAcquired message: %m");
-
- r = sd_bus_message_append(n, "s", p->destination_bus->unique_name);
- if (r < 0)
- return log_error_errno(r, "Failed to append unique name to NameAcquired message: %m");
-
- r = bus_message_append_sender(n, "org.freedesktop.DBus");
- if (r < 0)
- return log_error_errno(r, "Failed to append sender to NameAcquired message: %m");
-
- r = bus_seal_synthetic_message(p->local_bus, n);
- if (r < 0)
- return log_error_errno(r, "Failed to seal NameAcquired message: %m");
-
- r = sd_bus_send(p->local_bus, n, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to send NameAcquired message: %m");
-
- return 1;
-}
-
-static int patch_sender(sd_bus *a, sd_bus_message *m) {
- char **well_known = NULL;
- sd_bus_creds *c;
- int r;
-
- assert(a);
- assert(m);
-
- if (!a->is_kernel)
- return 0;
-
- /* We will change the sender of messages from the bus driver
- * so that they originate from the bus driver. This is a
- * speciality originating from dbus1, where the bus driver did
- * not have a unique id, but only the well-known name. */
-
- c = sd_bus_message_get_creds(m);
- if (!c)
- return 0;
-
- r = sd_bus_creds_get_well_known_names(c, &well_known);
- if (r < 0)
- return r;
-
- if (strv_contains(well_known, "org.freedesktop.DBus"))
- m->sender = "org.freedesktop.DBus";
-
- return 0;
-}
-
-static int proxy_process_destination_to_local(Proxy *p) {
- _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
- int r;
-
- assert(p);
-
- r = sd_bus_process(p->destination_bus, &m);
- if (r == -ECONNRESET || r == -ENOTCONN) /* Treat 'connection reset by peer' as clean exit condition */
- return r;
- if (r < 0) {
- log_error_errno(r, "Failed to process destination bus: %m");
- return r;
- }
- if (r == 0)
- return 0;
- if (!m)
- return 1;
-
- /* We officially got EOF, let's quit */
- if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected"))
- return -ECONNRESET;
-
- r = synthesize_name_acquired(p->destination_bus, p->local_bus, m);
- if (r == -ECONNRESET || r == -ENOTCONN)
- return r;
- if (r < 0)
- return log_error_errno(r, "Failed to synthesize message: %m");
-
- patch_sender(p->destination_bus, m);
-
- if (p->policy) {
- r = process_policy(p->destination_bus, p->local_bus, m, p->policy, &p->local_creds, p->owned_names);
- if (r == -ECONNRESET || r == -ENOTCONN)
- return r;
- if (r < 0)
- return log_error_errno(r, "Failed to process policy: %m");
- if (r > 0)
- return 1;
- }
-
- r = sd_bus_send(p->local_bus, m, NULL);
- if (r < 0) {
- if (r == -ECONNRESET || r == -ENOTCONN)
- return r;
-
- /* If the peer tries to send a reply and it is
- * rejected with EPERM by the kernel, we ignore the
- * error. This catches cases where the original
- * method-call didn't had EXPECT_REPLY set, but the
- * proxy-peer still sends a reply. This is allowed in
- * dbus1, but not in kdbus. We don't want to track
- * reply-windows in the proxy, so we simply ignore
- * EPERM for all replies. The only downside is, that
- * callers are no longer notified if their replies are
- * dropped. However, this is equivalent to the
- * caller's timeout to expire, so this should be
- * acceptable. Nobody sane sends replies without a
- * matching method-call, so nobody should care. */
- if (r == -EPERM && m->reply_cookie > 0)
- return 1;
-
- /* Return the error to the client, if we can */
- synthetic_reply_method_errnof(m, r, "Failed to forward message we got from destination: %m");
- if (r == -ENOBUFS) {
- /* if local dbus1 peer does not dispatch its queue, warn only once */
- if (!p->queue_overflow)
- log_error("Dropped messages due to queue overflow of local peer (pid: "PID_FMT" uid: "UID_FMT")", p->local_creds.pid, p->local_creds.uid);
- p->queue_overflow = true;
- } else
- log_error_errno(r,
- "Failed to forward message we got from destination: uid=" UID_FMT " gid=" GID_FMT" message=%s destination=%s path=%s interface=%s member=%s: %m",
- p->local_creds.uid, p->local_creds.gid, bus_message_type_to_string(m->header->type),
- strna(m->destination), strna(m->path), strna(m->interface), strna(m->member));
-
- return 1;
- }
-
- p->queue_overflow = false;
- return 1;
-}
-
-static int proxy_process_local_to_destination(Proxy *p) {
- _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
- int r;
-
- assert(p);
-
- r = sd_bus_process(p->local_bus, &m);
- if (r == -ECONNRESET || r == -ENOTCONN) /* Treat 'connection reset by peer' as clean exit condition */
- return r;
- if (r < 0) {
- log_error_errno(r, "Failed to process local bus: %m");
- return r;
- }
- if (r == 0)
- return 0;
- if (!m)
- return 1;
-
- /* We officially got EOF, let's quit */
- if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected"))
- return -ECONNRESET;
-
- r = process_hello(p, m);
- if (r == -ECONNRESET || r == -ENOTCONN)
- return r;
- if (r < 0)
- return log_error_errno(r, "Failed to process HELLO: %m");
- if (r > 0)
- return 1;
-
- r = bus_proxy_process_driver(p->destination_bus, p->local_bus, m, p->policy, &p->local_creds, p->owned_names);
- if (r == -ECONNRESET || r == -ENOTCONN)
- return r;
- if (r < 0)
- return log_error_errno(r, "Failed to process driver calls: %m");
- if (r > 0)
- return 1;
-
- for (;;) {
- if (p->policy) {
- r = process_policy(p->local_bus, p->destination_bus, m, p->policy, &p->local_creds, p->owned_names);
- if (r == -ECONNRESET || r == -ENOTCONN)
- return r;
- if (r < 0)
- return log_error_errno(r, "Failed to process policy: %m");
- if (r > 0)
- return 1;
- }
-
- r = sd_bus_send(p->destination_bus, m, NULL);
- if (r < 0) {
- if (r == -ECONNRESET || r == -ENOTCONN)
- return r;
-
- /* The name database changed since the policy check, hence let's check again */
- if (r == -EREMCHG)
- continue;
-
- /* see above why EPERM is ignored for replies */
- if (r == -EPERM && m->reply_cookie > 0)
- return 1;
-
- synthetic_reply_method_errnof(m, r, "Failed to forward message we got from local: %m");
- log_error_errno(r,
- "Failed to forward message we got from local: uid=" UID_FMT " gid=" GID_FMT" message=%s destination=%s path=%s interface=%s member=%s: %m",
- p->local_creds.uid, p->local_creds.gid, bus_message_type_to_string(m->header->type),
- strna(m->destination), strna(m->path), strna(m->interface), strna(m->member));
- return 1;
- }
-
- break;
- }
-
- return 1;
-}
-
-int proxy_run(Proxy *p) {
- int r;
-
- assert(p);
-
- for (;;) {
- bool busy = false;
-
- if (p->got_hello) {
- /* Read messages from bus, to pass them on to our client */
- r = proxy_process_destination_to_local(p);
- if (r == -ECONNRESET || r == -ENOTCONN)
- return 0;
- if (r < 0)
- return r;
- if (r > 0)
- busy = true;
- }
-
- /* Read messages from our client, to pass them on to the bus */
- r = proxy_process_local_to_destination(p);
- if (r == -ECONNRESET || r == -ENOTCONN)
- return 0;
- if (r < 0)
- return r;
- if (r > 0)
- busy = true;
-
- if (!busy) {
- r = proxy_wait(p);
- if (r == -ECONNRESET || r == -ENOTCONN)
- return 0;
- if (r < 0)
- return r;
- }
- }
-
- return 0;
-}
~ianmdlvl / elogind.git / blobdiff