diff options
Diffstat (limited to 'src/dbus1-generator')
| l--------- | src/dbus1-generator/Makefile | 1 | ||||
| -rw-r--r-- | src/dbus1-generator/dbus1-generator.c | 279 |
2 files changed, 280 insertions, 0 deletions
diff --git a/src/dbus1-generator/Makefile b/src/dbus1-generator/Makefile new file mode 120000 index 0000000000..d0b0e8e008 --- /dev/null +++ b/src/dbus1-generator/Makefile @@ -0,0 +1 @@ +../Makefile
\ No newline at end of file diff --git a/src/dbus1-generator/dbus1-generator.c b/src/dbus1-generator/dbus1-generator.c new file mode 100644 index 0000000000..93c6392f83 --- /dev/null +++ b/src/dbus1-generator/dbus1-generator.c @@ -0,0 +1,279 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2013 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 "util.h" +#include "conf-parser.h" +#include "special.h" +#include "mkdir.h" +#include "bus-util.h" +#include "bus-internal.h" +#include "unit-name.h" +#include "cgroup-util.h" + +static const char *arg_dest = "/tmp"; + +static int create_dbus_files( + const char *path, + const char *name, + const char *service, + const char *exec, + const char *user, + const char *type) { + + _cleanup_free_ char *b = NULL, *s = NULL, *lnk = NULL; + _cleanup_fclose_ FILE *f = NULL; + + assert(path); + assert(name); + + if (!service) { + _cleanup_free_ char *a = NULL; + + s = strjoin("dbus-", name, ".service", NULL); + if (!s) + return log_oom(); + + a = strjoin(arg_dest, "/", s, NULL); + if (!a) + return log_oom(); + + f = fopen(a, "wxe"); + if (!f) { + log_error("Failed to create %s: %m", a); + return -errno; + } + + fprintf(f, + "# Automatically generated by systemd-dbus1-generator\n\n" + "[Unit]\n" + "Source=%s\n" + "Description=DBUS1: %s\n\n" + "[Service]\n" + "ExecStart=%s\n" + "Type=dbus\n" + "BusName=%s\n", + path, + name, + exec, + name); + + if (user) + fprintf(f, "User=%s\n", user); + + + if (type) { + fprintf(f, "Environment=DBUS_STARTER_BUS_TYPE=%s\n", type); + + if (streq(type, "system")) + fprintf(f, "Environment=DBUS_STARTER_ADDRESS=kernel:/dev/kdbus/0-system\n"); + else if (streq(type, "session")) + fprintf(f, "Environment=DBUS_STARTER_ADDRESS=kernel:/dev/kdbus/%lu-user\n", (unsigned long) getuid()); + } + + fflush(f); + if (ferror(f)) { + log_error("Failed to write %s: %m", a); + return -errno; + } + + service = s; + } + + b = strjoin(arg_dest, "/", name, ".busname", NULL); + if (!b) + return log_oom(); + + f = fopen(b, "wxe"); + if (!f) { + log_error("Failed to create %s: %m", b); + return -errno; + } + + fprintf(f, + "# Automatically generated by systemd-dbus1-generator\n\n" + "[Unit]\n" + "Source=%s\n" + "Description=DBUS1: %s\n\n" + "[BusName]\n" + "Name=%s\n" + "Service=%s\n", + path, + name, + name, + service); + + fflush(f); + if (ferror(f)) { + log_error("Failed to write %s: %m", b); + return -errno; + } + + lnk = strjoin(arg_dest, "/" SPECIAL_BUSNAMES_TARGET ".wants/", name, ".busname", NULL); + if (!lnk) + return log_oom(); + + mkdir_parents_label(lnk, 0755); + if (symlink(b, lnk)) { + log_error("Failed to create symlinks %s: %m", lnk); + return -errno; + } + + return 0; +} + +static int add_dbus(const char *path, const char *fname, const char *type) { + _cleanup_free_ char *name = NULL, *exec = NULL, *user = NULL, *service = NULL; + + ConfigTableItem table[] = { + { "D-BUS Service", "Name", config_parse_string, 0, &name }, + { "D-BUS Service", "Exec", config_parse_string, 0, &exec }, + { "D-BUS Service", "User", config_parse_string, 0, &user }, + { "D-BUS Service", "SystemdService", config_parse_string, 0, &service }, + }; + + _cleanup_fclose_ FILE *f = NULL; + _cleanup_free_ char *p = NULL; + int r; + + assert(path); + assert(fname); + + p = strjoin(path, "/", fname, NULL); + if (!p) + return log_oom(); + + f = fopen(p, "re"); + if (!f) { + if (errno == -ENOENT) + return 0; + + log_error("Failed to read %s: %m", p); + return -errno; + } + + r = config_parse(NULL, p, f, "D-BUS Service\0", config_item_table_lookup, table, true, false, NULL); + if (r < 0) + return r; + + if (!name) { + log_warning("Activation file %s lacks name setting, ignoring.", p); + return 0; + } + + if (!service_name_is_valid(name)) { + log_warning("Bus service name %s is not valid, ignoring.", name); + return 0; + } + + if (service) { + if (!unit_name_is_valid(service, false)) { + log_warning("Unit name %s is not valid, ignoring.", service); + return 0; + } + if (!endswith(service, ".service")) { + log_warning("Bus names can only activate services, ignoring %s.", p); + return 0; + } + } else { + if (!exec) { + log_warning("Neither service name nor binary path specified, ignoring %s.", p); + return 0; + } + + if (exec[0] != '/') { + log_warning("Exec= in %s does not start with an absolute path, ignoring.", p); + return 0; + } + } + + return create_dbus_files(p, name, service, exec, user, type); +} + +static int parse_dbus_fragments(void) { + _cleanup_closedir_ DIR *d = NULL; + struct dirent *de; + const char *p, *type; + int r; + + r = cg_pid_get_owner_uid(0, NULL); + if (r >= 0) { + p = "/usr/share/dbus-1/services"; + type = "session"; + } else if (r == -ENOENT) { + p = "/usr/share/dbus-1/system-services"; + type = "systemd"; + } else if (r < 0) { + log_error("Failed to determine whether we are running as user or system instance: %s", strerror(-r)); + return r; + } + + d = opendir(p); + if (!d) { + if (errno == -ENOENT) + return 0; + + log_error("Failed to enumerate D-Bus activated services: %m"); + return -errno; + } + + r = 0; + FOREACH_DIRENT(de, d, goto fail) { + int q; + + if (!endswith(de->d_name, ".service")) + continue; + + q = add_dbus(p, de->d_name, type); + if (q < 0) + r = q; + } + + return r; + +fail: + log_error("Failed to read D-Bus services directory: %m"); + return -errno; +} + +int main(int argc, char *argv[]) { + int r; + + if (argc > 1 && argc != 4) { + log_error("This program takes three or no arguments."); + return EXIT_FAILURE; + } + + if (argc > 1) + arg_dest = argv[3]; + + log_set_target(LOG_TARGET_SAFE); + log_parse_environment(); + log_open(); + + umask(0022); + + if (access("/dev/kdbus/control", F_OK) < 0) + return 0; + + r = parse_dbus_fragments(); + + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} |