From 09365592341b4ba4ceca677bb551dcde811e0333 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Wed, 19 Mar 2014 04:17:00 +0100 Subject: sd-bus: add proper monitoring API --- src/libsystemd/libsystemd.sym.m4 | 1 + src/libsystemd/sd-bus/bus-control.c | 17 ++- src/libsystemd/sd-bus/bus-internal.h | 5 + src/libsystemd/sd-bus/bus-kernel.c | 9 +- src/libsystemd/sd-bus/bus-objects.c | 3 + src/libsystemd/sd-bus/busctl.c | 56 +++++++--- src/libsystemd/sd-bus/sd-bus.c | 206 ++++++++++++++++++++++------------- src/systemd/sd-bus.h | 1 + 8 files changed, 206 insertions(+), 92 deletions(-) diff --git a/src/libsystemd/libsystemd.sym.m4 b/src/libsystemd/libsystemd.sym.m4 index e9c42d0044..8589d605ab 100644 --- a/src/libsystemd/libsystemd.sym.m4 +++ b/src/libsystemd/libsystemd.sym.m4 @@ -154,6 +154,7 @@ m4_ifdef(`ENABLE_KDBUS', sd_bus_set_server; sd_bus_set_anonymous; sd_bus_set_trusted; + sd_bus_set_monitor; sd_bus_set_name; sd_bus_negotiate_fds; sd_bus_negotiate_timestamp; diff --git a/src/libsystemd/sd-bus/bus-control.c b/src/libsystemd/sd-bus/bus-control.c index db0c11b0fe..bb6683efff 100644 --- a/src/libsystemd/sd-bus/bus-control.c +++ b/src/libsystemd/sd-bus/bus-control.c @@ -1098,13 +1098,22 @@ int bus_add_match_internal_kernel( return 0; } +#define internal_match(bus, m) \ + ((bus)->hello_flags & KDBUS_HELLO_MONITOR \ + ? (isempty(m) ? "eavesdrop='true'" : strappenda((m), ",eavesdrop='true'")) \ + : (m)) + static int bus_add_match_internal_dbus1( sd_bus *bus, const char *match) { + const char *e; + assert(bus); assert(match); + e = internal_match(bus, match); + return sd_bus_call_method( bus, "org.freedesktop.DBus", @@ -1114,7 +1123,7 @@ static int bus_add_match_internal_dbus1( NULL, NULL, "s", - match); + e); } int bus_add_match_internal( @@ -1159,9 +1168,13 @@ static int bus_remove_match_internal_dbus1( sd_bus *bus, const char *match) { + const char *e; + assert(bus); assert(match); + e = internal_match(bus, match); + return sd_bus_call_method( bus, "org.freedesktop.DBus", @@ -1171,7 +1184,7 @@ static int bus_remove_match_internal_dbus1( NULL, NULL, "s", - match); + e); } int bus_remove_match_internal( diff --git a/src/libsystemd/sd-bus/bus-internal.h b/src/libsystemd/sd-bus/bus-internal.h index ae5f66288f..3dceb8a5da 100644 --- a/src/libsystemd/sd-bus/bus-internal.h +++ b/src/libsystemd/sd-bus/bus-internal.h @@ -335,3 +335,8 @@ char *bus_address_escape(const char *v); * on */ #define BUS_DONT_DESTROY(bus) \ _cleanup_bus_unref_ _unused_ sd_bus *_dont_destroy_##bus = sd_bus_ref(bus) + +int bus_set_address_system(sd_bus *bus); +int bus_set_address_user(sd_bus *bus); +int bus_set_address_system_remote(sd_bus *b, const char *host); +int bus_set_address_system_container(sd_bus *b, const char *machine); diff --git a/src/libsystemd/sd-bus/bus-kernel.c b/src/libsystemd/sd-bus/bus-kernel.c index 00f58114ac..af42b9f5e1 100644 --- a/src/libsystemd/sd-bus/bus-kernel.c +++ b/src/libsystemd/sd-bus/bus-kernel.c @@ -1339,9 +1339,13 @@ int bus_kernel_create_bus(const char *name, bool world, char **s) { return fd; } -static void bus_kernel_translate_policy(const BusNamePolicy *policy, struct kdbus_item *item) -{ +static void bus_kernel_translate_policy(const BusNamePolicy *policy, struct kdbus_item *item) { + + assert(policy); + assert(item); + switch (policy->type) { + case BUSNAME_POLICY_TYPE_USER: item->policy_access.type = KDBUS_POLICY_ACCESS_USER; item->policy_access.id = policy->uid; @@ -1361,6 +1365,7 @@ static void bus_kernel_translate_policy(const BusNamePolicy *policy, struct kdbu } switch (policy->access) { + case BUSNAME_POLICY_ACCESS_SEE: item->policy_access.access = KDBUS_POLICY_SEE; break; diff --git a/src/libsystemd/sd-bus/bus-objects.c b/src/libsystemd/sd-bus/bus-objects.c index 7d325fab33..08792fea22 100644 --- a/src/libsystemd/sd-bus/bus-objects.c +++ b/src/libsystemd/sd-bus/bus-objects.c @@ -1304,6 +1304,9 @@ int bus_process_object(sd_bus *bus, sd_bus_message *m) { assert(bus); assert(m); + if (bus->hello_flags & KDBUS_HELLO_MONITOR) + return 0; + if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL) return 0; diff --git a/src/libsystemd/sd-bus/busctl.c b/src/libsystemd/sd-bus/busctl.c index e326cc047a..b4fb364716 100644 --- a/src/libsystemd/sd-bus/busctl.c +++ b/src/libsystemd/sd-bus/busctl.c @@ -494,29 +494,57 @@ int main(int argc, char *argv[]) { if (r <= 0) goto finish; - if (arg_address) { - r = sd_bus_new(&bus); + r = sd_bus_new(&bus); + if (r < 0) { + log_error("Failed to allocate bus: %s", strerror(-r)); + goto finish; + } + + if (streq_ptr(argv[optind], "monitor")) { + + r = sd_bus_set_monitor(bus, true); if (r < 0) { - log_error("Failed to allocate bus: %s", strerror(-r)); + log_error("Failed to set monitor mode: %s", strerror(-r)); goto finish; } + } + if (arg_address) r = sd_bus_set_address(bus, arg_address); - if (r < 0) { - log_error("Failed to set address: %s", strerror(-r)); - goto finish; - } + else { + switch (arg_transport) { - r = sd_bus_set_bus_client(bus, true); - if (r < 0) { - log_error("Failed to set bus client: %s", strerror(-r)); - goto finish; + case BUS_TRANSPORT_LOCAL: + if (arg_user) + r = bus_set_address_user(bus); + else + r = bus_set_address_system(bus); + break; + + case BUS_TRANSPORT_REMOTE: + r = bus_set_address_system_remote(bus, arg_host); + break; + + case BUS_TRANSPORT_CONTAINER: + r = bus_set_address_system_container(bus, arg_host); + break; + + default: + assert_not_reached("Hmm, unknown transport type."); } + } + if (r < 0) { + log_error("Failed to set address: %s", strerror(-r)); + goto finish; + } - r = sd_bus_start(bus); - } else - r = bus_open_transport(arg_transport, arg_host, arg_user, &bus); + r = sd_bus_set_bus_client(bus, true); + if (r < 0) { + log_error("Failed to set bus client: %s", strerror(-r)); + goto finish; + } + r = sd_bus_start(bus); if (r < 0) { log_error("Failed to connect to bus: %s", strerror(-r)); goto finish; diff --git a/src/libsystemd/sd-bus/sd-bus.c b/src/libsystemd/sd-bus/sd-bus.c index 6a1f459044..6f5ba5bd5b 100644 --- a/src/libsystemd/sd-bus/sd-bus.c +++ b/src/libsystemd/sd-bus/sd-bus.c @@ -284,6 +284,15 @@ _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) { return 0; } +_public_ int sd_bus_set_monitor(sd_bus *bus, int b) { + assert_return(bus, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(!bus_pid_changed(bus), -ECHILD); + + SET_FLAG(bus->hello_flags, KDBUS_HELLO_MONITOR, b); + return 0; +} + _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) { assert_return(bus, -EINVAL); assert_return(bus->state == BUS_UNSET, -EPERM); @@ -1075,7 +1084,7 @@ _public_ int sd_bus_open(sd_bus **ret) { if (e) { if (streq(e, "system")) return sd_bus_open_system(ret); - else if (streq(e, "session") || streq(e, "user")) + else if (STR_IN_SET(e, "session", "user")) return sd_bus_open_user(ret); } @@ -1114,8 +1123,18 @@ fail: return r; } -_public_ int sd_bus_open_system(sd_bus **ret) { +int bus_set_address_system(sd_bus *b) { const char *e; + assert(b); + + e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS"); + if (e) + return sd_bus_set_address(b, e); + + return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_PATH); +} + +_public_ int sd_bus_open_system(sd_bus **ret) { sd_bus *b; int r; @@ -1125,11 +1144,7 @@ _public_ int sd_bus_open_system(sd_bus **ret) { if (r < 0) return r; - e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS"); - if (e) - r = sd_bus_set_address(b, e); - else - r = sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_PATH); + r = bus_set_address_system(b); if (r < 0) goto fail; @@ -1153,53 +1168,56 @@ fail: return r; } -_public_ int sd_bus_open_user(sd_bus **ret) { +int bus_set_address_user(sd_bus *b) { const char *e; - sd_bus *b; - int r; - assert_return(ret, -EINVAL); - - r = sd_bus_new(&b); - if (r < 0) - return r; + assert(b); e = secure_getenv("DBUS_SESSION_BUS_ADDRESS"); + if (e) + return sd_bus_set_address(b, e); + + e = secure_getenv("XDG_RUNTIME_DIR"); if (e) { - r = sd_bus_set_address(b, e); - if (r < 0) - goto fail; - } else { - e = secure_getenv("XDG_RUNTIME_DIR"); - if (e) { - _cleanup_free_ char *ee = NULL; + _cleanup_free_ char *ee = NULL; - ee = bus_address_escape(e); - if (!ee) { - r = -ENOMEM; - goto fail; - } + ee = bus_address_escape(e); + if (!ee) + return -ENOMEM; #ifdef ENABLE_KDBUS - asprintf(&b->address, KERNEL_USER_BUS_FMT ";" UNIX_USER_BUS_FMT, (unsigned long) getuid(), ee); + asprintf(&b->address, KERNEL_USER_BUS_FMT ";" UNIX_USER_BUS_FMT, (unsigned long) getuid(), ee); #else - asprintf(&b->address, UNIX_USER_BUS_FMT, ee); + asprintf(&b->address, UNIX_USER_BUS_FMT, ee); #endif - } else { + } else { #ifdef ENABLE_KDBUS - asprintf(&b->address, KERNEL_USER_BUS_FMT, (unsigned long) getuid()); + asprintf(&b->address, KERNEL_USER_BUS_FMT, (unsigned long) getuid()); #else - r = -ECONNREFUSED; - goto fail; + return -ECONNREFUSED; #endif - } - - if (!b->address) { - r = -ENOMEM; - goto fail; - } } + if (!b->address) + return -ENOMEM; + + return 0; +} + +_public_ int sd_bus_open_user(sd_bus **ret) { + sd_bus *b; + int r; + + assert_return(ret, -EINVAL); + + r = sd_bus_new(&b); + if (r < 0) + return r; + + r = bus_set_address_user(b); + if (r < 0) + return r; + b->bus_client = true; b->is_user = true; @@ -1219,81 +1237,103 @@ fail: return r; } -_public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) { +int bus_set_address_system_remote(sd_bus *b, const char *host) { _cleanup_free_ char *e = NULL; - char *p = NULL; - sd_bus *bus; - int r; - assert_return(host, -EINVAL); - assert_return(ret, -EINVAL); + assert(b); + assert(host); e = bus_address_escape(host); if (!e) return -ENOMEM; - p = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", NULL); - if (!p) + b->address = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", NULL); + if (!b->address) return -ENOMEM; + return 0; + } + +_public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) { + sd_bus *bus; + int r; + + assert_return(host, -EINVAL); + assert_return(ret, -EINVAL); + r = sd_bus_new(&bus); - if (r < 0) { - free(p); + if (r < 0) return r; - } - bus->address = p; + r = bus_set_address_system_remote(bus, host); + if (r < 0) + goto fail; + bus->bus_client = true; + bus->trusted = false; r = sd_bus_start(bus); - if (r < 0) { - bus_free(bus); - return r; - } + if (r < 0) + goto fail; *ret = bus; return 0; + +fail: + bus_free(bus); + return r; } -_public_ int sd_bus_open_system_container(sd_bus **ret, const char *machine) { +int bus_set_address_system_container(sd_bus *b, const char *machine) { _cleanup_free_ char *e = NULL; - sd_bus *bus; - char *p; - int r; - assert_return(machine, -EINVAL); - assert_return(ret, -EINVAL); - assert_return(filename_is_safe(machine), -EINVAL); + assert(b); + assert(machine); e = bus_address_escape(machine); if (!e) return -ENOMEM; #ifdef ENABLE_KDBUS - p = strjoin("x-container-kernel:machine=", e, ";x-container-unix:machine=", e, NULL); + b->address = strjoin("x-container-kernel:machine=", e, ";x-container-unix:machine=", e, NULL); #else - p = strjoin("x-container-unix:machine=", e, NULL); + b->address = strjoin("x-container-unix:machine=", e, NULL); #endif - if (!p) + if (!b->address) return -ENOMEM; + return 0; +} + +_public_ int sd_bus_open_system_container(sd_bus **ret, const char *machine) { + sd_bus *bus; + int r; + + assert_return(machine, -EINVAL); + assert_return(ret, -EINVAL); + assert_return(filename_is_safe(machine), -EINVAL); + r = sd_bus_new(&bus); - if (r < 0) { - free(p); + if (r < 0) return r; - } - bus->address = p; + r = bus_set_address_system_container(bus, machine); + if (r < 0) + goto fail; + bus->bus_client = true; + bus->trusted = false; r = sd_bus_start(bus); - if (r < 0) { - bus_free(bus); - return r; - } + if (r < 0) + goto fail; *ret = bus; return 0; + +fail: + bus_free(bus); + return r; } _public_ void sd_bus_close(sd_bus *bus) { @@ -1397,6 +1437,9 @@ _public_ int sd_bus_can_send(sd_bus *bus, char type) { assert_return(bus->state != BUS_UNSET, -ENOTCONN); assert_return(!bus_pid_changed(bus), -ECHILD); + if (bus->hello_flags & KDBUS_HELLO_MONITOR) + return 0; + if (type == SD_BUS_TYPE_UNIX_FD) { if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) return 0; @@ -1598,6 +1641,7 @@ static int bus_send_internal(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie, assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); assert_return(m, -EINVAL); assert_return(!bus_pid_changed(bus), -ECHILD); + assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS); if (m->n_fds > 0) { r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD); @@ -1735,6 +1779,7 @@ _public_ int sd_bus_call_async( assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL); assert_return(callback, -EINVAL); assert_return(!bus_pid_changed(bus), -ECHILD); + assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS); r = hashmap_ensure_allocated(&bus->reply_callbacks, uint64_hash_func, uint64_compare_func); if (r < 0) @@ -1848,6 +1893,7 @@ _public_ int sd_bus_call( assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL); assert_return(!bus_error_is_dirty(error), -EINVAL); assert_return(!bus_pid_changed(bus), -ECHILD); + assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS); r = bus_ensure_running(bus); if (r < 0) @@ -2125,6 +2171,12 @@ static int process_reply(sd_bus *bus, sd_bus_message *m) { m->header->type != SD_BUS_MESSAGE_METHOD_ERROR) return 0; + if (bus->is_kernel && (bus->hello_flags & KDBUS_HELLO_MONITOR)) + return 0; + + if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name)) + return 0; + c = hashmap_remove(bus->reply_callbacks, &m->reply_cookie); if (!c) return 0; @@ -2225,6 +2277,9 @@ static int process_builtin(sd_bus *bus, sd_bus_message *m) { assert(bus); assert(m); + if (bus->hello_flags & KDBUS_HELLO_MONITOR) + return 0; + if (bus->manual_peer_interface) return 0; @@ -2280,6 +2335,9 @@ static int process_fd_check(sd_bus *bus, sd_bus_message *m) { * delivered to us later even though we ourselves did not * negotiate it. */ + if (bus->hello_flags & KDBUS_HELLO_MONITOR) + return 0; + if (m->n_fds <= 0) return 0; @@ -3077,7 +3135,7 @@ _public_ int sd_bus_default(sd_bus **ret) { if (e) { if (streq(e, "system")) return sd_bus_default_system(ret); - else if (streq(e, "user") || streq(e, "session")) + else if (STR_IN_SET(e, "user", "session")) return sd_bus_default_user(ret); } diff --git a/src/systemd/sd-bus.h b/src/systemd/sd-bus.h index 8817380f1a..ff2333fb4a 100644 --- a/src/systemd/sd-bus.h +++ b/src/systemd/sd-bus.h @@ -116,6 +116,7 @@ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id); int sd_bus_set_anonymous(sd_bus *bus, int b); int sd_bus_set_trusted(sd_bus *bus, int b); int sd_bus_set_name(sd_bus *bus, const char *name); +int sd_bus_set_monitor(sd_bus *bus, int b); int sd_bus_negotiate_fds(sd_bus *bus, int b); int sd_bus_negotiate_timestamp(sd_bus *bus, int b); int sd_bus_negotiate_creds(sd_bus *bus, uint64_t creds_mask); -- cgit v1.2.3-54-g00ecf