/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include "alloc-util.h" #include "bus-internal.h" #include "bus-match.h" #include "bus-message.h" #include "fd-util.h" #include "fileio.h" #include "hexdecoct.h" #include "sort-util.h" #include "string-util.h" #include "strv.h" /* Example: * * A: type=signal,sender=foo,interface=bar * B: type=signal,sender=quux,interface=fips * C: type=signal,sender=quux,interface=waldo * D: type=signal,member=test * E: sender=miau * F: type=signal * G: type=signal * * results in this tree: * * BUS_MATCH_ROOT * + BUS_MATCH_MESSAGE_TYPE * | ` BUS_MATCH_VALUE: value == signal * | + DBUS_MATCH_SENDER * | | + BUS_MATCH_VALUE: value == foo * | | | ` DBUS_MATCH_INTERFACE * | | | ` BUS_MATCH_VALUE: value == bar * | | | ` BUS_MATCH_LEAF: A * | | ` BUS_MATCH_VALUE: value == quux * | | ` DBUS_MATCH_INTERFACE * | | | BUS_MATCH_VALUE: value == fips * | | | ` BUS_MATCH_LEAF: B * | | ` BUS_MATCH_VALUE: value == waldo * | | ` BUS_MATCH_LEAF: C * | + DBUS_MATCH_MEMBER * | | ` BUS_MATCH_VALUE: value == test * | | ` BUS_MATCH_LEAF: D * | + BUS_MATCH_LEAF: F * | ` BUS_MATCH_LEAF: G * ` BUS_MATCH_SENDER * ` BUS_MATCH_VALUE: value == miau * ` BUS_MATCH_LEAF: E */ static bool BUS_MATCH_IS_COMPARE(enum bus_match_node_type t) { return t >= BUS_MATCH_SENDER && t <= BUS_MATCH_ARG_HAS_LAST; } static bool BUS_MATCH_CAN_HASH(enum bus_match_node_type t) { return (t >= BUS_MATCH_MESSAGE_TYPE && t <= BUS_MATCH_PATH) || (t >= BUS_MATCH_ARG && t <= BUS_MATCH_ARG_LAST) || (t >= BUS_MATCH_ARG_HAS && t <= BUS_MATCH_ARG_HAS_LAST); } static void bus_match_node_free(struct bus_match_node *node) { assert(node); assert(node->parent); assert(!node->child); assert(node->type != BUS_MATCH_ROOT); assert(node->type < _BUS_MATCH_NODE_TYPE_MAX); if (node->parent->child) { /* We are apparently linked into the parent's child * list. Let's remove us from there. */ if (node->prev) { assert(node->prev->next == node); node->prev->next = node->next; } else { assert(node->parent->child == node); node->parent->child = node->next; } if (node->next) node->next->prev = node->prev; } if (node->type == BUS_MATCH_VALUE) { /* We might be in the parent's hash table, so clean * this up */ if (node->parent->type == BUS_MATCH_MESSAGE_TYPE) hashmap_remove(node->parent->compare.children, UINT_TO_PTR(node->value.u8)); else if (BUS_MATCH_CAN_HASH(node->parent->type) && node->value.str) hashmap_remove(node->parent->compare.children, node->value.str); free(node->value.str); } if (BUS_MATCH_IS_COMPARE(node->type)) { assert(hashmap_isempty(node->compare.children)); hashmap_free(node->compare.children); } free(node); } static bool bus_match_node_maybe_free(struct bus_match_node *node) { assert(node); if (node->type == BUS_MATCH_ROOT) return false; if (node->child) return false; if (BUS_MATCH_IS_COMPARE(node->type) && !hashmap_isempty(node->compare.children)) return true; bus_match_node_free(node); return true; } static bool value_node_test( struct bus_match_node *node, enum bus_match_node_type parent_type, uint8_t value_u8, const char *value_str, char **value_strv, sd_bus_message *m) { assert(node); assert(node->type == BUS_MATCH_VALUE); /* Tests parameters against this value node, doing prefix * magic and stuff. */ switch (parent_type) { case BUS_MATCH_MESSAGE_TYPE: return node->value.u8 == value_u8; case BUS_MATCH_SENDER: if (streq_ptr(node->value.str, value_str)) return true; if (m->creds.mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { /* on kdbus we have the well known names list * in the credentials, let's make use of that * for an accurate match */ STRV_FOREACH(i, m->creds.well_known_names) if (streq_ptr(node->value.str, *i)) return true; } else { /* If we don't have kdbus, we don't know the * well-known names of the senders. In that, * let's just hope that dbus-daemon doesn't * send us stuff we didn't want. */ if (node->value.str[0] != ':' && value_str && value_str[0] == ':') return true; } return false; case BUS_MATCH_DESTINATION: case BUS_MATCH_INTERFACE: case BUS_MATCH_MEMBER: case BUS_MATCH_PATH: case BUS_MATCH_ARG ... BUS_MATCH_ARG_LAST: if (value_str) return streq_ptr(node->value.str, value_str); return false; case BUS_MATCH_ARG_HAS ... BUS_MATCH_ARG_HAS_LAST: { STRV_FOREACH(i, value_strv) if (streq_ptr(node->value.str, *i)) return true; return false; } case BUS_MATCH_ARG_NAMESPACE ... BUS_MATCH_ARG_NAMESPACE_LAST: if (value_str) return namespace_simple_pattern(node->value.str, value_str); return false; case BUS_MATCH_PATH_NAMESPACE: return path_simple_pattern(node->value.str, value_str); case BUS_MATCH_ARG_PATH ... BUS_MATCH_ARG_PATH_LAST: if (value_str) return path_complex_pattern(node->value.str, value_str); return false; default: assert_not_reached(); } } static bool value_node_same( struct bus_match_node *node, enum bus_match_node_type parent_type, uint8_t value_u8, const char *value_str) { /* Tests parameters against this value node, not doing prefix * magic and stuff, i.e. this one actually compares the match * itself. */ assert(node); assert(node->type == BUS_MATCH_VALUE); switch (parent_type) { case BUS_MATCH_MESSAGE_TYPE: return node->value.u8 == value_u8; case BUS_MATCH_SENDER: case BUS_MATCH_DESTINATION: case BUS_MATCH_INTERFACE: case BUS_MATCH_MEMBER: case BUS_MATCH_PATH: case BUS_MATCH_ARG ... BUS_MATCH_ARG_LAST: case BUS_MATCH_ARG_HAS ... BUS_MATCH_ARG_HAS_LAST: case BUS_MATCH_ARG_NAMESPACE ... BUS_MATCH_ARG_NAMESPACE_LAST: case BUS_MATCH_PATH_NAMESPACE: case BUS_MATCH_ARG_PATH ... BUS_MATCH_ARG_PATH_LAST: return streq(node->value.str, value_str); default: assert_not_reached(); } } int bus_match_run( sd_bus *bus, struct bus_match_node *node, sd_bus_message *m) { _cleanup_strv_free_ char **test_strv = NULL; const char *test_str = NULL; uint8_t test_u8 = 0; int r; assert(m); if (!node) return 0; if (bus && bus->match_callbacks_modified) return 0; /* Not these special semantics: when traversing the tree we * usually let bus_match_run() when called for a node * recursively invoke bus_match_run(). There's are two * exceptions here though, which are BUS_NODE_ROOT (which * cannot have a sibling), and BUS_NODE_VALUE (whose siblings * are invoked anyway by its parent. */ switch (node->type) { case BUS_MATCH_ROOT: /* Run all children. Since we cannot have any siblings * we won't call any. The children of the root node * are compares or leaves, they will automatically * call their siblings. */ return bus_match_run(bus, node->child, m); case BUS_MATCH_VALUE: /* Run all children. We don't execute any siblings, we * assume our caller does that. The children of value * nodes are compares or leaves, they will * automatically call their siblings */ assert(node->child); return bus_match_run(bus, node->child, m); case BUS_MATCH_LEAF: if (bus) { /* Don't run this match as long as the AddMatch() call is not complete yet. * * Don't run this match unless the 'after' counter has been reached. * * Don't run this match more than once per iteration */ if (node->leaf.callback->install_slot || m->read_counter <= node->leaf.callback->after || node->leaf.callback->last_iteration == bus->iteration_counter) return bus_match_run(bus, node->next, m); node->leaf.callback->last_iteration = bus->iteration_counter; } r = sd_bus_message_rewind(m, true); if (r < 0) return r; /* Run the callback. And then invoke siblings. */ if (node->leaf.callback->callback) { _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL; sd_bus_slot *slot; slot = container_of(node->leaf.callback, sd_bus_slot, match_callback); if (bus) { bus->current_slot = sd_bus_slot_ref(slot); bus->current_handler = node->leaf.callback->callback; bus->current_userdata = slot->userdata; } r = node->leaf.callback->callback(m, slot->userdata, &error_buffer); if (bus) { bus->current_userdata = NULL; bus->current_handler = NULL; bus->current_slot = sd_bus_slot_unref(slot); } r = bus_maybe_reply_error(m, r, &error_buffer); if (r != 0) return r; if (bus && bus->match_callbacks_modified) return 0; } return bus_match_run(bus, node->next, m); case BUS_MATCH_MESSAGE_TYPE: test_u8 = m->header->type; break; case BUS_MATCH_SENDER: test_str = m->sender; /* FIXME: resolve test_str from a well-known to a unique name first */ break; case BUS_MATCH_DESTINATION: test_str = m->destination; break; case BUS_MATCH_INTERFACE: test_str = m->interface; break; case BUS_MATCH_MEMBER: test_str = m->member; break; case BUS_MATCH_PATH: case BUS_MATCH_PATH_NAMESPACE: test_str = m->path; break; case BUS_MATCH_ARG ... BUS_MATCH_ARG_LAST: (void) bus_message_get_arg(m, node->type - BUS_MATCH_ARG, &test_str); break; case BUS_MATCH_ARG_PATH ... BUS_MATCH_ARG_PATH_LAST: (void) bus_message_get_arg(m, node->type - BUS_MATCH_ARG_PATH, &test_str); break; case BUS_MATCH_ARG_NAMESPACE ... BUS_MATCH_ARG_NAMESPACE_LAST: (void) bus_message_get_arg(m, node->type - BUS_MATCH_ARG_NAMESPACE, &test_str); break; case BUS_MATCH_ARG_HAS ... BUS_MATCH_ARG_HAS_LAST: (void) bus_message_get_arg_strv(m, node->type - BUS_MATCH_ARG_HAS, &test_strv); break; default: assert_not_reached(); } if (BUS_MATCH_CAN_HASH(node->type)) { struct bus_match_node *found; /* Lookup via hash table, nice! So let's jump directly. */ if (test_str) found = hashmap_get(node->compare.children, test_str); else if (test_strv) { STRV_FOREACH(i, test_strv) { found = hashmap_get(node->compare.children, *i); if (found) { r = bus_match_run(bus, found, m); if (r != 0) return r; } } found = NULL; } else if (node->type == BUS_MATCH_MESSAGE_TYPE) found = hashmap_get(node->compare.children, UINT_TO_PTR(test_u8)); else found = NULL; if (found) { r = bus_match_run(bus, found, m); if (r != 0) return r; } } else /* No hash table, so let's iterate manually... */ for (struct bus_match_node *c = node->child; c; c = c->next) { if (!value_node_test(c, node->type, test_u8, test_str, test_strv, m)) continue; r = bus_match_run(bus, c, m); if (r != 0) return r; if (bus && bus->match_callbacks_modified) return 0; } if (bus && bus->match_callbacks_modified) return 0; /* And now, let's invoke our siblings */ return bus_match_run(bus, node->next, m); } static int bus_match_add_compare_value( struct bus_match_node *where, enum bus_match_node_type t, uint8_t value_u8, const char *value_str, struct bus_match_node **ret) { struct bus_match_node *c, *n = NULL; int r; assert(where); assert(IN_SET(where->type, BUS_MATCH_ROOT, BUS_MATCH_VALUE)); assert(BUS_MATCH_IS_COMPARE(t)); assert(ret); for (c = where->child; c && c->type != t; c = c->next) ; if (c) { /* Comparison node already exists? Then let's see if the value node exists too. */ if (t == BUS_MATCH_MESSAGE_TYPE) n = hashmap_get(c->compare.children, UINT_TO_PTR(value_u8)); else if (BUS_MATCH_CAN_HASH(t)) n = hashmap_get(c->compare.children, value_str); else for (n = c->child; n && !value_node_same(n, t, value_u8, value_str); n = n->next) ; if (n) { *ret = n; return 0; } } else { /* Comparison node, doesn't exist yet? Then let's create it. */ c = new0(struct bus_match_node, 1); if (!c) { r = -ENOMEM; goto fail; } c->type = t; c->parent = where; c->next = where->child; if (c->next) c->next->prev = c; where->child = c; if (t == BUS_MATCH_MESSAGE_TYPE) { c->compare.children = hashmap_new(NULL); if (!c->compare.children) { r = -ENOMEM; goto fail; } } else if (BUS_MATCH_CAN_HASH(t)) { c->compare.children = hashmap_new(&string_hash_ops); if (!c->compare.children) { r = -ENOMEM; goto fail; } } } n = new0(struct bus_match_node, 1); if (!n) { r = -ENOMEM; goto fail; } n->type = BUS_MATCH_VALUE; n->value.u8 = value_u8; if (value_str) { n->value.str = strdup(value_str); if (!n->value.str) { r = -ENOMEM; goto fail; } } n->parent = c; if (c->compare.children) { if (t == BUS_MATCH_MESSAGE_TYPE) r = hashmap_put(c->compare.children, UINT_TO_PTR(value_u8), n); else r = hashmap_put(c->compare.children, n->value.str, n); if (r < 0) goto fail; } else { n->next = c->child; if (n->next) n->next->prev = n; c->child = n; } *ret = n; return 1; fail: if (c) bus_match_node_maybe_free(c); if (n) { free(n->value.str); free(n); } return r; } static int bus_match_add_leaf( struct bus_match_node *where, struct match_callback *callback) { struct bus_match_node *n; assert(where); assert(IN_SET(where->type, BUS_MATCH_ROOT, BUS_MATCH_VALUE)); assert(callback); n = new0(struct bus_match_node, 1); if (!n) return -ENOMEM; n->type = BUS_MATCH_LEAF; n->parent = where; n->next = where->child; if (n->next) n->next->prev = n; n->leaf.callback = callback; callback->match_node = n; where->child = n; return 1; } enum bus_match_node_type bus_match_node_type_from_string(const char *k, size_t n) { assert(k); if (n == 4 && startswith(k, "type")) return BUS_MATCH_MESSAGE_TYPE; if (n == 6 && startswith(k, "sender")) return BUS_MATCH_SENDER; if (n == 11 && startswith(k, "destination")) return BUS_MATCH_DESTINATION; if (n == 9 && startswith(k, "interface")) return BUS_MATCH_INTERFACE; if (n == 6 && startswith(k, "member")) return BUS_MATCH_MEMBER; if (n == 4 && startswith(k, "path")) return BUS_MATCH_PATH; if (n == 14 && startswith(k, "path_namespace")) return BUS_MATCH_PATH_NAMESPACE; if (n == 4 && startswith(k, "arg")) { int j; j = undecchar(k[3]); if (j < 0) return -EINVAL; return BUS_MATCH_ARG + j; } if (n == 5 && startswith(k, "arg")) { int a, b; enum bus_match_node_type t; a = undecchar(k[3]); b = undecchar(k[4]); if (a <= 0 || b < 0) return -EINVAL; t = BUS_MATCH_ARG + a * 10 + b; if (t > BUS_MATCH_ARG_LAST) return -EINVAL; return t; } if (n == 8 && startswith(k, "arg") && startswith(k + 4, "path")) { int j; j = undecchar(k[3]); if (j < 0) return -EINVAL; return BUS_MATCH_ARG_PATH + j; } if (n == 9 && startswith(k, "arg") && startswith(k + 5, "path")) { enum bus_match_node_type t; int a, b; a = undecchar(k[3]); b = undecchar(k[4]); if (a <= 0 || b < 0) return -EINVAL; t = BUS_MATCH_ARG_PATH + a * 10 + b; if (t > BUS_MATCH_ARG_PATH_LAST) return -EINVAL; return t; } if (n == 13 && startswith(k, "arg") && startswith(k + 4, "namespace")) { int j; j = undecchar(k[3]); if (j < 0) return -EINVAL; return BUS_MATCH_ARG_NAMESPACE + j; } if (n == 14 && startswith(k, "arg") && startswith(k + 5, "namespace")) { enum bus_match_node_type t; int a, b; a = undecchar(k[3]); b = undecchar(k[4]); if (a <= 0 || b < 0) return -EINVAL; t = BUS_MATCH_ARG_NAMESPACE + a * 10 + b; if (t > BUS_MATCH_ARG_NAMESPACE_LAST) return -EINVAL; return t; } if (n == 7 && startswith(k, "arg") && startswith(k + 4, "has")) { int j; j = undecchar(k[3]); if (j < 0) return -EINVAL; return BUS_MATCH_ARG_HAS + j; } if (n == 8 && startswith(k, "arg") && startswith(k + 5, "has")) { enum bus_match_node_type t; int a, b; a = undecchar(k[3]); b = undecchar(k[4]); if (a <= 0 || b < 0) return -EINVAL; t = BUS_MATCH_ARG_HAS + a * 10 + b; if (t > BUS_MATCH_ARG_HAS_LAST) return -EINVAL; return t; } return -EINVAL; } static int match_component_compare(const struct bus_match_component *a, const struct bus_match_component *b) { return CMP(a->type, b->type); } void bus_match_parse_free(struct bus_match_component *components, unsigned n_components) { for (unsigned i = 0; i < n_components; i++) free(components[i].value_str); free(components); } int bus_match_parse( const char *match, struct bus_match_component **ret_components, unsigned *ret_n_components) { struct bus_match_component *components = NULL; unsigned n_components = 0; int r; assert(match); assert(ret_components); assert(ret_n_components); while (*match != '\0') { const char *eq, *q; enum bus_match_node_type t; unsigned j = 0; _cleanup_free_ char *value = NULL; bool escaped = false, quoted; uint8_t u; /* Avahi's match rules appear to include whitespace, skip over it */ match += strspn(match, " "); eq = strchr(match, '='); if (!eq) { r = -EINVAL; goto fail; } t = bus_match_node_type_from_string(match, eq - match); if (t < 0) { r = -EINVAL; goto fail; } quoted = eq[1] == '\''; for (q = eq + 1 + quoted;; q++) { if (*q == '\0') { if (quoted) { r = -EINVAL; goto fail; } else { if (value) value[j] = '\0'; break; } } if (!escaped) { if (*q == '\\') { escaped = true; continue; } if (quoted) { if (*q == '\'') { if (value) value[j] = '\0'; break; } } else { if (*q == ',') { if (value) value[j] = '\0'; break; } } } if (!GREEDY_REALLOC(value, j + 2)) { r = -ENOMEM; goto fail; } value[j++] = *q; escaped = false; } if (!value) { value = strdup(""); if (!value) { r = -ENOMEM; goto fail; } } if (t == BUS_MATCH_MESSAGE_TYPE) { r = bus_message_type_from_string(value, &u); if (r < 0) goto fail; value = mfree(value); } else u = 0; if (!GREEDY_REALLOC(components, n_components + 1)) { r = -ENOMEM; goto fail; } components[n_components++] = (struct bus_match_component) { .type = t, .value_str = TAKE_PTR(value), .value_u8 = u, }; if (q[quoted] == 0) break; if (q[quoted] != ',') { r = -EINVAL; goto fail; } match = q + 1 + quoted; } /* Order the whole thing, so that we always generate the same tree */ typesafe_qsort(components, n_components, match_component_compare); /* Check for duplicates */ for (unsigned i = 0; i+1 < n_components; i++) if (components[i].type == components[i+1].type) { r = -EINVAL; goto fail; } *ret_components = components; *ret_n_components = n_components; return 0; fail: bus_match_parse_free(components, n_components); return r; } char *bus_match_to_string(struct bus_match_component *components, unsigned n_components) { _cleanup_free_ char *buffer = NULL; size_t size = 0; int r; if (n_components <= 0) return strdup(""); assert(components); FILE *f = open_memstream_unlocked(&buffer, &size); if (!f) return NULL; for (unsigned i = 0; i < n_components; i++) { char buf[32]; if (i != 0) fputc(',', f); fputs(bus_match_node_type_to_string(components[i].type, buf, sizeof(buf)), f); fputc('=', f); fputc('\'', f); if (components[i].type == BUS_MATCH_MESSAGE_TYPE) fputs(bus_message_type_to_string(components[i].value_u8), f); else fputs(components[i].value_str, f); fputc('\'', f); } r = fflush_and_check(f); safe_fclose(f); if (r < 0) return NULL; return TAKE_PTR(buffer); } int bus_match_add( struct bus_match_node *root, struct bus_match_component *components, unsigned n_components, struct match_callback *callback) { int r; assert(root); assert(callback); for (unsigned i = 0; i < n_components; i++) { r = bus_match_add_compare_value(root, components[i].type, components[i].value_u8, components[i].value_str, &root); if (r < 0) return r; } return bus_match_add_leaf(root, callback); } int bus_match_remove( struct bus_match_node *root, struct match_callback *callback) { struct bus_match_node *node, *pp; assert(root); assert(callback); node = callback->match_node; if (!node) return 0; assert(node->type == BUS_MATCH_LEAF); callback->match_node = NULL; /* Free the leaf */ pp = node->parent; bus_match_node_free(node); /* Prune the tree above */ while (pp) { node = pp; pp = node->parent; if (!bus_match_node_maybe_free(node)) break; } return 1; } void bus_match_free(struct bus_match_node *node) { struct bus_match_node *c; if (!node) return; if (BUS_MATCH_CAN_HASH(node->type)) { HASHMAP_FOREACH(c, node->compare.children) bus_match_free(c); assert(hashmap_isempty(node->compare.children)); } while ((c = node->child)) bus_match_free(c); if (node->type != BUS_MATCH_ROOT) bus_match_node_free(node); } const char* bus_match_node_type_to_string(enum bus_match_node_type t, char buf[], size_t l) { switch (t) { case BUS_MATCH_ROOT: return "root"; case BUS_MATCH_VALUE: return "value"; case BUS_MATCH_LEAF: return "leaf"; case BUS_MATCH_MESSAGE_TYPE: return "type"; case BUS_MATCH_SENDER: return "sender"; case BUS_MATCH_DESTINATION: return "destination"; case BUS_MATCH_INTERFACE: return "interface"; case BUS_MATCH_MEMBER: return "member"; case BUS_MATCH_PATH: return "path"; case BUS_MATCH_PATH_NAMESPACE: return "path_namespace"; case BUS_MATCH_ARG ... BUS_MATCH_ARG_LAST: return snprintf_ok(buf, l, "arg%i", t - BUS_MATCH_ARG); case BUS_MATCH_ARG_PATH ... BUS_MATCH_ARG_PATH_LAST: return snprintf_ok(buf, l, "arg%ipath", t - BUS_MATCH_ARG_PATH); case BUS_MATCH_ARG_NAMESPACE ... BUS_MATCH_ARG_NAMESPACE_LAST: return snprintf_ok(buf, l, "arg%inamespace", t - BUS_MATCH_ARG_NAMESPACE); case BUS_MATCH_ARG_HAS ... BUS_MATCH_ARG_HAS_LAST: return snprintf_ok(buf, l, "arg%ihas", t - BUS_MATCH_ARG_HAS); default: return NULL; } } void bus_match_dump(FILE *out, struct bus_match_node *node, unsigned level) { char buf[32]; if (!node) return; fprintf(out, "%*s[%s]", 2 * level, "", bus_match_node_type_to_string(node->type, buf, sizeof(buf))); if (node->type == BUS_MATCH_VALUE) { if (node->parent->type == BUS_MATCH_MESSAGE_TYPE) fprintf(out, " <%u>\n", node->value.u8); else fprintf(out, " <%s>\n", node->value.str); } else if (node->type == BUS_MATCH_ROOT) fputs(" root\n", out); else if (node->type == BUS_MATCH_LEAF) fprintf(out, " %p/%p\n", node->leaf.callback->callback, container_of(node->leaf.callback, sd_bus_slot, match_callback)->userdata); else putc('\n', out); if (BUS_MATCH_CAN_HASH(node->type)) { struct bus_match_node *c; HASHMAP_FOREACH(c, node->compare.children) bus_match_dump(out, c, level + 1); } for (struct bus_match_node *c = node->child; c; c = c->next) bus_match_dump(out, c, level + 1); } enum bus_match_scope bus_match_get_scope(const struct bus_match_component *components, unsigned n_components) { bool found_driver = false; if (n_components <= 0) return BUS_MATCH_GENERIC; assert(components); /* Checks whether the specified match can only match the * pseudo-service for local messages, which we detect by * sender, interface or path. If a match is not restricted to * local messages, then we check if it only matches on the * driver. */ for (unsigned i = 0; i < n_components; i++) { const struct bus_match_component *c = components + i; if (c->type == BUS_MATCH_SENDER) { if (streq_ptr(c->value_str, "org.freedesktop.DBus.Local")) return BUS_MATCH_LOCAL; if (streq_ptr(c->value_str, "org.freedesktop.DBus")) found_driver = true; } if (c->type == BUS_MATCH_INTERFACE && streq_ptr(c->value_str, "org.freedesktop.DBus.Local")) return BUS_MATCH_LOCAL; if (c->type == BUS_MATCH_PATH && streq_ptr(c->value_str, "/org/freedesktop/DBus/Local")) return BUS_MATCH_LOCAL; } return found_driver ? BUS_MATCH_DRIVER : BUS_MATCH_GENERIC; }