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resolve: check DNSSD service name template before assigning it
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7a602af041
commit
34136e1503
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@ -1754,7 +1754,6 @@ static int bus_method_register_service(sd_bus_message *message, void *userdata,
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_cleanup_(dnssd_service_freep) DnssdService *service = NULL;
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_cleanup_(sd_bus_track_unrefp) sd_bus_track *bus_track = NULL;
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_cleanup_free_ char *path = NULL;
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_cleanup_free_ char *instance_name = NULL;
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Manager *m = userdata;
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DnssdService *s = NULL;
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const char *name;
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@ -1795,6 +1794,10 @@ static int bus_method_register_service(sd_bus_message *message, void *userdata,
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if (!dnssd_srv_type_is_valid(type))
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return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "DNS-SD service type '%s' is invalid", type);
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r = dnssd_render_instance_name(name_template, NULL);
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if (r < 0)
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return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "DNS-SD service name '%s' is invalid", name_template);
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service->name = strdup(name);
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if (!service->name)
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return log_oom();
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@ -1807,10 +1810,6 @@ static int bus_method_register_service(sd_bus_message *message, void *userdata,
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if (!service->type)
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return log_oom();
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r = dnssd_render_instance_name(service, &instance_name);
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if (r < 0)
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return r;
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r = sd_bus_message_enter_container(message, SD_BUS_TYPE_ARRAY, "a{say}");
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if (r < 0)
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return r;
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@ -222,21 +222,19 @@ int config_parse_search_domains(
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return 0;
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}
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int config_parse_dnssd_service_name(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) {
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static const Specifier specifier_table[] = {
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{ 'm', specifier_machine_id, NULL },
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{ 'b', specifier_boot_id, NULL },
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{ 'H', specifier_host_name, NULL },
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{ 'v', specifier_kernel_release, NULL },
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{ 'a', specifier_architecture, NULL },
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{ 'o', specifier_os_id, NULL },
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{ 'w', specifier_os_version_id, NULL },
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{ 'B', specifier_os_build_id, NULL },
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{ 'W', specifier_os_variant_id, NULL },
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{}
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};
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int config_parse_dnssd_service_name(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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DnssdService *s = userdata;
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_cleanup_free_ char *name = NULL;
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int r;
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assert(filename);
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@ -245,23 +243,23 @@ int config_parse_dnssd_service_name(const char *unit, const char *filename, unsi
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assert(s);
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if (isempty(rvalue)) {
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log_syntax(unit, LOG_ERR, filename, line, 0, "Service instance name can't be empty. Ignoring.");
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return -EINVAL;
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s->name_template = mfree(s->name_template);
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return 0;
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}
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r = dnssd_render_instance_name(rvalue, NULL);
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if (r == -ENOMEM)
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return log_oom();
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if (r < 0) {
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log_syntax(unit, LOG_WARNING, filename, line, r,
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"Invalid service instance name template '%s', ignoring: %m", rvalue);
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return 0;
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}
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r = free_and_strdup(&s->name_template, rvalue);
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if (r < 0)
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return log_oom();
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r = specifier_printf(s->name_template, specifier_table, NULL, &name);
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if (r < 0)
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return log_debug_errno(r, "Failed to replace specifiers: %m");
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if (!dns_service_name_is_valid(name)) {
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log_syntax(unit, LOG_ERR, filename, line, 0, "Service instance name template renders to invalid name '%s'. Ignoring.", name);
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return -EINVAL;
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}
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return 0;
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}
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@ -155,7 +155,7 @@ static int specifier_dnssd_host_name(char specifier, const void *data, const voi
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return 0;
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}
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int dnssd_render_instance_name(DnssdService *s, char **ret_name) {
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int dnssd_render_instance_name(const char *name_template, char **ret_name) {
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static const Specifier specifier_table[] = {
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{ 'm', specifier_machine_id, NULL },
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{ 'b', specifier_boot_id, NULL },
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@ -171,19 +171,17 @@ int dnssd_render_instance_name(DnssdService *s, char **ret_name) {
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_cleanup_free_ char *name = NULL;
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int r;
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assert(s);
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assert(s->name_template);
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assert(name_template);
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r = specifier_printf(s->name_template, specifier_table, s, &name);
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r = specifier_printf(name_template, specifier_table, NULL, &name);
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if (r < 0)
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return log_debug_errno(r, "Failed to replace specifiers: %m");
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return r;
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if (!dns_service_name_is_valid(name))
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return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
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"Service instance name '%s' is invalid.",
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name);
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return -EINVAL;
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*ret_name = TAKE_PTR(name);
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if (ret_name)
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*ret_name = TAKE_PTR(name);
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return 0;
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}
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@ -227,7 +225,7 @@ int dnssd_update_rrs(DnssdService *s) {
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LIST_FOREACH(items, txt_data, s->txt_data_items)
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txt_data->rr = dns_resource_record_unref(txt_data->rr);
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r = dnssd_render_instance_name(s, &n);
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r = dnssd_render_instance_name(s->name_template, &n);
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if (r < 0)
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return r;
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@ -51,7 +51,7 @@ DnssdTxtData *dnssd_txtdata_free_all(DnssdTxtData *txt_data);
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DEFINE_TRIVIAL_CLEANUP_FUNC(DnssdService*, dnssd_service_free);
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DEFINE_TRIVIAL_CLEANUP_FUNC(DnssdTxtData*, dnssd_txtdata_free);
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int dnssd_render_instance_name(DnssdService *s, char **ret_name);
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int dnssd_render_instance_name(const char *name_template, char **ret_name);
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int dnssd_load(Manager *manager);
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int dnssd_txt_item_new_from_string(const char *key, const char *value, DnsTxtItem **ret_item);
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int dnssd_txt_item_new_from_data(const char *key, const void *value, const size_t size, DnsTxtItem **ret_item);
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