diff options
Diffstat (limited to 'src/import/importd.c')
| -rw-r--r-- | src/import/importd.c | 1420 |
1 files changed, 1420 insertions, 0 deletions
diff --git a/src/import/importd.c b/src/import/importd.c new file mode 100644 index 0000000..6692589 --- /dev/null +++ b/src/import/importd.c @@ -0,0 +1,1420 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <sys/prctl.h> +#include <sys/wait.h> + +#include "sd-bus.h" + +#include "alloc-util.h" +#include "bus-common-errors.h" +#include "bus-get-properties.h" +#include "bus-log-control-api.h" +#include "bus-polkit.h" +#include "def.h" +#include "env-util.h" +#include "fd-util.h" +#include "float.h" +#include "hostname-util.h" +#include "import-util.h" +#include "machine-pool.h" +#include "main-func.h" +#include "missing_capability.h" +#include "mkdir-label.h" +#include "parse-util.h" +#include "path-util.h" +#include "percent-util.h" +#include "process-util.h" +#include "service-util.h" +#include "signal-util.h" +#include "socket-util.h" +#include "stat-util.h" +#include "string-table.h" +#include "strv.h" +#include "syslog-util.h" +#include "user-util.h" +#include "util.h" +#include "web-util.h" + +typedef struct Transfer Transfer; +typedef struct Manager Manager; + +typedef enum TransferType { + TRANSFER_IMPORT_TAR, + TRANSFER_IMPORT_RAW, + TRANSFER_IMPORT_FS, + TRANSFER_EXPORT_TAR, + TRANSFER_EXPORT_RAW, + TRANSFER_PULL_TAR, + TRANSFER_PULL_RAW, + _TRANSFER_TYPE_MAX, + _TRANSFER_TYPE_INVALID = -EINVAL, +} TransferType; + +struct Transfer { + Manager *manager; + + uint32_t id; + char *object_path; + + TransferType type; + ImportVerify verify; + + char *remote; + char *local; + bool force_local; + bool read_only; + + char *format; + + pid_t pid; + + int log_fd; + + char log_message[LINE_MAX]; + size_t log_message_size; + + sd_event_source *pid_event_source; + sd_event_source *log_event_source; + + unsigned n_canceled; + unsigned progress_percent; + + int stdin_fd; + int stdout_fd; +}; + +struct Manager { + sd_event *event; + sd_bus *bus; + + uint32_t current_transfer_id; + Hashmap *transfers; + + Hashmap *polkit_registry; + + int notify_fd; + + sd_event_source *notify_event_source; + + bool use_btrfs_subvol; + bool use_btrfs_quota; +}; + +#define TRANSFERS_MAX 64 + +static const char* const transfer_type_table[_TRANSFER_TYPE_MAX] = { + [TRANSFER_IMPORT_TAR] = "import-tar", + [TRANSFER_IMPORT_RAW] = "import-raw", + [TRANSFER_IMPORT_FS] = "import-fs", + [TRANSFER_EXPORT_TAR] = "export-tar", + [TRANSFER_EXPORT_RAW] = "export-raw", + [TRANSFER_PULL_TAR] = "pull-tar", + [TRANSFER_PULL_RAW] = "pull-raw", +}; + +DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(transfer_type, TransferType); + +static Transfer *transfer_unref(Transfer *t) { + if (!t) + return NULL; + + if (t->manager) + hashmap_remove(t->manager->transfers, UINT32_TO_PTR(t->id)); + + sd_event_source_unref(t->pid_event_source); + sd_event_source_unref(t->log_event_source); + + free(t->remote); + free(t->local); + free(t->format); + free(t->object_path); + + if (t->pid > 1) + sigkill_wait(t->pid); + + safe_close(t->log_fd); + safe_close(t->stdin_fd); + safe_close(t->stdout_fd); + + return mfree(t); +} + +DEFINE_TRIVIAL_CLEANUP_FUNC(Transfer*, transfer_unref); + +static int transfer_new(Manager *m, Transfer **ret) { + _cleanup_(transfer_unrefp) Transfer *t = NULL; + uint32_t id; + int r; + + assert(m); + assert(ret); + + if (hashmap_size(m->transfers) >= TRANSFERS_MAX) + return -E2BIG; + + t = new(Transfer, 1); + if (!t) + return -ENOMEM; + + *t = (Transfer) { + .type = _TRANSFER_TYPE_INVALID, + .log_fd = -1, + .stdin_fd = -1, + .stdout_fd = -1, + .verify = _IMPORT_VERIFY_INVALID, + .progress_percent= UINT_MAX, + }; + + id = m->current_transfer_id + 1; + + if (asprintf(&t->object_path, "/org/freedesktop/import1/transfer/_%" PRIu32, id) < 0) + return -ENOMEM; + + r = hashmap_ensure_put(&m->transfers, &trivial_hash_ops, UINT32_TO_PTR(id), t); + if (r < 0) + return r; + + m->current_transfer_id = id; + + t->manager = m; + t->id = id; + + *ret = TAKE_PTR(t); + + return 0; +} + +static double transfer_percent_as_double(Transfer *t) { + assert(t); + + if (t->progress_percent == UINT_MAX) + return -DBL_MAX; + + return (double) t->progress_percent / 100.0; +} + +static void transfer_send_log_line(Transfer *t, const char *line) { + int r, priority = LOG_INFO; + + assert(t); + assert(line); + + syslog_parse_priority(&line, &priority, true); + + log_full(priority, "(transfer%" PRIu32 ") %s", t->id, line); + + r = sd_bus_emit_signal( + t->manager->bus, + t->object_path, + "org.freedesktop.import1.Transfer", + "LogMessage", + "us", + priority, + line); + if (r < 0) + log_warning_errno(r, "Cannot emit log message signal, ignoring: %m"); + } + +static void transfer_send_logs(Transfer *t, bool flush) { + assert(t); + + /* Try to send out all log messages, if we can. But if we + * can't we remove the messages from the buffer, but don't + * fail */ + + while (t->log_message_size > 0) { + _cleanup_free_ char *n = NULL; + char *e; + + if (t->log_message_size >= sizeof(t->log_message)) + e = t->log_message + sizeof(t->log_message); + else { + char *a, *b; + + a = memchr(t->log_message, 0, t->log_message_size); + b = memchr(t->log_message, '\n', t->log_message_size); + + if (a && b) + e = a < b ? a : b; + else if (a) + e = a; + else + e = b; + } + + if (!e) { + if (!flush) + return; + + e = t->log_message + t->log_message_size; + } + + n = strndup(t->log_message, e - t->log_message); + + /* Skip over NUL and newlines */ + while (e < t->log_message + t->log_message_size && IN_SET(*e, 0, '\n')) + e++; + + memmove(t->log_message, e, t->log_message + sizeof(t->log_message) - e); + t->log_message_size -= e - t->log_message; + + if (!n) { + log_oom(); + continue; + } + + if (isempty(n)) + continue; + + transfer_send_log_line(t, n); + } +} + +static int transfer_finalize(Transfer *t, bool success) { + int r; + + assert(t); + + transfer_send_logs(t, true); + + r = sd_bus_emit_signal( + t->manager->bus, + "/org/freedesktop/import1", + "org.freedesktop.import1.Manager", + "TransferRemoved", + "uos", + t->id, + t->object_path, + success ? "done" : + t->n_canceled > 0 ? "canceled" : "failed"); + + if (r < 0) + log_error_errno(r, "Cannot emit message: %m"); + + transfer_unref(t); + return 0; +} + +static int transfer_cancel(Transfer *t) { + int r; + + assert(t); + + r = kill_and_sigcont(t->pid, t->n_canceled < 3 ? SIGTERM : SIGKILL); + if (r < 0) + return r; + + t->n_canceled++; + return 0; +} + +static int transfer_on_pid(sd_event_source *s, const siginfo_t *si, void *userdata) { + Transfer *t = ASSERT_PTR(userdata); + bool success = false; + + assert(s); + + if (si->si_code == CLD_EXITED) { + if (si->si_status != 0) + log_error("Transfer process failed with exit code %i.", si->si_status); + else { + log_debug("Transfer process succeeded."); + success = true; + } + + } else if (IN_SET(si->si_code, CLD_KILLED, CLD_DUMPED)) + log_error("Transfer process terminated by signal %s.", signal_to_string(si->si_status)); + else + log_error("Transfer process failed due to unknown reason."); + + t->pid = 0; + + return transfer_finalize(t, success); +} + +static int transfer_on_log(sd_event_source *s, int fd, uint32_t revents, void *userdata) { + Transfer *t = ASSERT_PTR(userdata); + ssize_t l; + + assert(s); + + l = read(fd, t->log_message + t->log_message_size, sizeof(t->log_message) - t->log_message_size); + if (l < 0) + log_error_errno(errno, "Failed to read log message: %m"); + if (l <= 0) { + /* EOF/read error. We just close the pipe here, and + * close the watch, waiting for the SIGCHLD to arrive, + * before we do anything else. */ + t->log_event_source = sd_event_source_unref(t->log_event_source); + return 0; + } + + t->log_message_size += l; + + transfer_send_logs(t, false); + + return 0; +} + +static int transfer_start(Transfer *t) { + _cleanup_close_pair_ int pipefd[2] = { -1, -1 }; + int r; + + assert(t); + assert(t->pid <= 0); + + if (pipe2(pipefd, O_CLOEXEC) < 0) + return -errno; + + r = safe_fork("(sd-transfer)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &t->pid); + if (r < 0) + return r; + if (r == 0) { + const char *cmd[] = { + NULL, /* systemd-import, systemd-import-fs, systemd-export or systemd-pull */ + NULL, /* tar, raw */ + NULL, /* --verify= */ + NULL, /* verify argument */ + NULL, /* maybe --force */ + NULL, /* maybe --read-only */ + NULL, /* if so: the actual URL */ + NULL, /* maybe --format= */ + NULL, /* if so: the actual format */ + NULL, /* remote */ + NULL, /* local */ + NULL + }; + unsigned k = 0; + + /* Child */ + + pipefd[0] = safe_close(pipefd[0]); + + r = rearrange_stdio(TAKE_FD(t->stdin_fd), + t->stdout_fd < 0 ? pipefd[1] : TAKE_FD(t->stdout_fd), + pipefd[1]); + TAKE_FD(pipefd[1]); + if (r < 0) { + log_error_errno(r, "Failed to set stdin/stdout/stderr: %m"); + _exit(EXIT_FAILURE); + } + + if (setenv("SYSTEMD_LOG_TARGET", "console-prefixed", 1) < 0 || + setenv("NOTIFY_SOCKET", "/run/systemd/import/notify", 1) < 0) { + log_error_errno(errno, "setenv() failed: %m"); + _exit(EXIT_FAILURE); + } + + r = setenv_systemd_exec_pid(true); + if (r < 0) + log_warning_errno(r, "Failed to update $SYSTEMD_EXEC_PID, ignoring: %m"); + + switch (t->type) { + + case TRANSFER_IMPORT_TAR: + case TRANSFER_IMPORT_RAW: + cmd[k++] = SYSTEMD_IMPORT_PATH; + break; + + case TRANSFER_IMPORT_FS: + cmd[k++] = SYSTEMD_IMPORT_FS_PATH; + break; + + case TRANSFER_EXPORT_TAR: + case TRANSFER_EXPORT_RAW: + cmd[k++] = SYSTEMD_EXPORT_PATH; + break; + + case TRANSFER_PULL_TAR: + case TRANSFER_PULL_RAW: + cmd[k++] = SYSTEMD_PULL_PATH; + break; + + default: + assert_not_reached(); + } + + switch (t->type) { + + case TRANSFER_IMPORT_TAR: + case TRANSFER_EXPORT_TAR: + case TRANSFER_PULL_TAR: + cmd[k++] = "tar"; + break; + + case TRANSFER_IMPORT_RAW: + case TRANSFER_EXPORT_RAW: + case TRANSFER_PULL_RAW: + cmd[k++] = "raw"; + break; + + case TRANSFER_IMPORT_FS: + cmd[k++] = "run"; + break; + + default: + break; + } + + if (t->verify != _IMPORT_VERIFY_INVALID) { + cmd[k++] = "--verify"; + cmd[k++] = import_verify_to_string(t->verify); + } + + if (t->force_local) + cmd[k++] = "--force"; + if (t->read_only) + cmd[k++] = "--read-only"; + + if (t->format) { + cmd[k++] = "--format"; + cmd[k++] = t->format; + } + + if (!IN_SET(t->type, TRANSFER_EXPORT_TAR, TRANSFER_EXPORT_RAW)) { + if (t->remote) + cmd[k++] = t->remote; + else + cmd[k++] = "-"; + } + + if (t->local) + cmd[k++] = t->local; + cmd[k] = NULL; + + execv(cmd[0], (char * const *) cmd); + log_error_errno(errno, "Failed to execute %s tool: %m", cmd[0]); + _exit(EXIT_FAILURE); + } + + pipefd[1] = safe_close(pipefd[1]); + t->log_fd = TAKE_FD(pipefd[0]); + + t->stdin_fd = safe_close(t->stdin_fd); + + r = sd_event_add_child(t->manager->event, &t->pid_event_source, + t->pid, WEXITED, transfer_on_pid, t); + if (r < 0) + return r; + + r = sd_event_add_io(t->manager->event, &t->log_event_source, + t->log_fd, EPOLLIN, transfer_on_log, t); + if (r < 0) + return r; + + /* Make sure always process logging before SIGCHLD */ + r = sd_event_source_set_priority(t->log_event_source, SD_EVENT_PRIORITY_NORMAL -5); + if (r < 0) + return r; + + r = sd_bus_emit_signal( + t->manager->bus, + "/org/freedesktop/import1", + "org.freedesktop.import1.Manager", + "TransferNew", + "uo", + t->id, + t->object_path); + if (r < 0) + return r; + + return 0; +} + +static Manager *manager_unref(Manager *m) { + Transfer *t; + + if (!m) + return NULL; + + sd_event_source_unref(m->notify_event_source); + safe_close(m->notify_fd); + + while ((t = hashmap_first(m->transfers))) + transfer_unref(t); + + hashmap_free(m->transfers); + + bus_verify_polkit_async_registry_free(m->polkit_registry); + + m->bus = sd_bus_flush_close_unref(m->bus); + sd_event_unref(m->event); + + return mfree(m); +} + +DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_unref); + +static int manager_on_notify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { + + char buf[NOTIFY_BUFFER_MAX+1]; + struct iovec iovec = { + .iov_base = buf, + .iov_len = sizeof(buf)-1, + }; + CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred)) + + CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)) control; + struct msghdr msghdr = { + .msg_iov = &iovec, + .msg_iovlen = 1, + .msg_control = &control, + .msg_controllen = sizeof(control), + }; + struct ucred *ucred; + Manager *m = userdata; + char *p, *e; + Transfer *t; + ssize_t n; + int r; + + n = recvmsg_safe(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); + if (n < 0) { + if (ERRNO_IS_TRANSIENT(n)) + return 0; + return (int) n; + } + + cmsg_close_all(&msghdr); + + if (msghdr.msg_flags & MSG_TRUNC) { + log_warning("Got overly long notification datagram, ignoring."); + return 0; + } + + ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred); + if (!ucred || ucred->pid <= 0) { + log_warning("Got notification datagram lacking credential information, ignoring."); + return 0; + } + + HASHMAP_FOREACH(t, m->transfers) + if (ucred->pid == t->pid) + break; + + if (!t) { + log_warning("Got notification datagram from unexpected peer, ignoring."); + return 0; + } + + buf[n] = 0; + + p = startswith(buf, "X_IMPORT_PROGRESS="); + if (!p) { + p = strstr(buf, "\nX_IMPORT_PROGRESS="); + if (!p) + return 0; + + p += 19; + } + + e = strchrnul(p, '\n'); + *e = 0; + + r = parse_percent(p); + if (r < 0) { + log_warning("Got invalid percent value, ignoring."); + return 0; + } + + t->progress_percent = (unsigned) r; + + log_debug("Got percentage from client: %u%%", t->progress_percent); + return 0; +} + +static int manager_new(Manager **ret) { + _cleanup_(manager_unrefp) Manager *m = NULL; + static const union sockaddr_union sa = { + .un.sun_family = AF_UNIX, + .un.sun_path = "/run/systemd/import/notify", + }; + int r; + + assert(ret); + + m = new(Manager, 1); + if (!m) + return -ENOMEM; + + *m = (Manager) { + .use_btrfs_subvol = true, + .use_btrfs_quota = true, + }; + + r = sd_event_default(&m->event); + if (r < 0) + return r; + + sd_event_set_watchdog(m->event, true); + + r = sd_bus_default_system(&m->bus); + if (r < 0) + return r; + + m->notify_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); + if (m->notify_fd < 0) + return -errno; + + (void) mkdir_parents_label(sa.un.sun_path, 0755); + (void) sockaddr_un_unlink(&sa.un); + + if (bind(m->notify_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) + return -errno; + + r = setsockopt_int(m->notify_fd, SOL_SOCKET, SO_PASSCRED, true); + if (r < 0) + return r; + + r = sd_event_add_io(m->event, &m->notify_event_source, + m->notify_fd, EPOLLIN, manager_on_notify, m); + if (r < 0) + return r; + + *ret = TAKE_PTR(m); + + return 0; +} + +static Transfer *manager_find(Manager *m, TransferType type, const char *remote) { + Transfer *t; + + assert(m); + assert(type >= 0); + assert(type < _TRANSFER_TYPE_MAX); + + HASHMAP_FOREACH(t, m->transfers) + if (t->type == type && streq_ptr(t->remote, remote)) + return t; + + return NULL; +} + +static int method_import_tar_or_raw(sd_bus_message *msg, void *userdata, sd_bus_error *error) { + _cleanup_(transfer_unrefp) Transfer *t = NULL; + int fd, force, read_only, r; + const char *local, *object; + Manager *m = ASSERT_PTR(userdata); + TransferType type; + struct stat st; + uint32_t id; + + assert(msg); + + r = bus_verify_polkit_async( + msg, + CAP_SYS_ADMIN, + "org.freedesktop.import1.import", + NULL, + false, + UID_INVALID, + &m->polkit_registry, + error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = sd_bus_message_read(msg, "hsbb", &fd, &local, &force, &read_only); + if (r < 0) + return r; + + if (fstat(fd, &st) < 0) + return -errno; + + if (!S_ISREG(st.st_mode) && !S_ISFIFO(st.st_mode)) + return -EINVAL; + + if (!hostname_is_valid(local, 0)) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, + "Local name %s is invalid", local); + + r = setup_machine_directory(error, m->use_btrfs_subvol, m->use_btrfs_quota); + if (r < 0) + return r; + + type = streq_ptr(sd_bus_message_get_member(msg), "ImportTar") ? + TRANSFER_IMPORT_TAR : TRANSFER_IMPORT_RAW; + + r = transfer_new(m, &t); + if (r < 0) + return r; + + t->type = type; + t->force_local = force; + t->read_only = read_only; + + t->local = strdup(local); + if (!t->local) + return -ENOMEM; + + t->stdin_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); + if (t->stdin_fd < 0) + return -errno; + + r = transfer_start(t); + if (r < 0) + return r; + + object = t->object_path; + id = t->id; + t = NULL; + + return sd_bus_reply_method_return(msg, "uo", id, object); +} + +static int method_import_fs(sd_bus_message *msg, void *userdata, sd_bus_error *error) { + _cleanup_(transfer_unrefp) Transfer *t = NULL; + int fd, force, read_only, r; + const char *local, *object; + Manager *m = ASSERT_PTR(userdata); + uint32_t id; + + assert(msg); + + r = bus_verify_polkit_async( + msg, + CAP_SYS_ADMIN, + "org.freedesktop.import1.import", + NULL, + false, + UID_INVALID, + &m->polkit_registry, + error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = sd_bus_message_read(msg, "hsbb", &fd, &local, &force, &read_only); + if (r < 0) + return r; + + r = fd_verify_directory(fd); + if (r < 0) + return r; + + if (!hostname_is_valid(local, 0)) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, + "Local name %s is invalid", local); + + r = setup_machine_directory(error, m->use_btrfs_subvol, m->use_btrfs_quota); + if (r < 0) + return r; + + r = transfer_new(m, &t); + if (r < 0) + return r; + + t->type = TRANSFER_IMPORT_FS; + t->force_local = force; + t->read_only = read_only; + + t->local = strdup(local); + if (!t->local) + return -ENOMEM; + + t->stdin_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); + if (t->stdin_fd < 0) + return -errno; + + r = transfer_start(t); + if (r < 0) + return r; + + object = t->object_path; + id = t->id; + t = NULL; + + return sd_bus_reply_method_return(msg, "uo", id, object); +} + +static int method_export_tar_or_raw(sd_bus_message *msg, void *userdata, sd_bus_error *error) { + _cleanup_(transfer_unrefp) Transfer *t = NULL; + int fd, r; + const char *local, *object, *format; + Manager *m = ASSERT_PTR(userdata); + TransferType type; + struct stat st; + uint32_t id; + + assert(msg); + + r = bus_verify_polkit_async( + msg, + CAP_SYS_ADMIN, + "org.freedesktop.import1.export", + NULL, + false, + UID_INVALID, + &m->polkit_registry, + error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = sd_bus_message_read(msg, "shs", &local, &fd, &format); + if (r < 0) + return r; + + if (!hostname_is_valid(local, 0)) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, + "Local name %s is invalid", local); + + if (fstat(fd, &st) < 0) + return -errno; + + if (!S_ISREG(st.st_mode) && !S_ISFIFO(st.st_mode)) + return -EINVAL; + + type = streq_ptr(sd_bus_message_get_member(msg), "ExportTar") ? + TRANSFER_EXPORT_TAR : TRANSFER_EXPORT_RAW; + + r = transfer_new(m, &t); + if (r < 0) + return r; + + t->type = type; + + if (!isempty(format)) { + t->format = strdup(format); + if (!t->format) + return -ENOMEM; + } + + t->local = strdup(local); + if (!t->local) + return -ENOMEM; + + t->stdout_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); + if (t->stdout_fd < 0) + return -errno; + + r = transfer_start(t); + if (r < 0) + return r; + + object = t->object_path; + id = t->id; + t = NULL; + + return sd_bus_reply_method_return(msg, "uo", id, object); +} + +static int method_pull_tar_or_raw(sd_bus_message *msg, void *userdata, sd_bus_error *error) { + _cleanup_(transfer_unrefp) Transfer *t = NULL; + const char *remote, *local, *verify, *object; + Manager *m = ASSERT_PTR(userdata); + ImportVerify v; + TransferType type; + int force, r; + uint32_t id; + + assert(msg); + + r = bus_verify_polkit_async( + msg, + CAP_SYS_ADMIN, + "org.freedesktop.import1.pull", + NULL, + false, + UID_INVALID, + &m->polkit_registry, + error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = sd_bus_message_read(msg, "sssb", &remote, &local, &verify, &force); + if (r < 0) + return r; + + if (!http_url_is_valid(remote) && !file_url_is_valid(remote)) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, + "URL %s is invalid", remote); + + if (isempty(local)) + local = NULL; + else if (!hostname_is_valid(local, 0)) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, + "Local name %s is invalid", local); + + if (isempty(verify)) + v = IMPORT_VERIFY_SIGNATURE; + else + v = import_verify_from_string(verify); + if (v < 0) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, + "Unknown verification mode %s", verify); + + r = setup_machine_directory(error, m->use_btrfs_subvol, m->use_btrfs_quota); + if (r < 0) + return r; + + type = streq_ptr(sd_bus_message_get_member(msg), "PullTar") ? + TRANSFER_PULL_TAR : TRANSFER_PULL_RAW; + + if (manager_find(m, type, remote)) + return sd_bus_error_setf(error, BUS_ERROR_TRANSFER_IN_PROGRESS, + "Transfer for %s already in progress.", remote); + + r = transfer_new(m, &t); + if (r < 0) + return r; + + t->type = type; + t->verify = v; + t->force_local = force; + + t->remote = strdup(remote); + if (!t->remote) + return -ENOMEM; + + if (local) { + t->local = strdup(local); + if (!t->local) + return -ENOMEM; + } + + r = transfer_start(t); + if (r < 0) + return r; + + object = t->object_path; + id = t->id; + t = NULL; + + return sd_bus_reply_method_return(msg, "uo", id, object); +} + +static int method_list_transfers(sd_bus_message *msg, void *userdata, sd_bus_error *error) { + _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; + Manager *m = ASSERT_PTR(userdata); + Transfer *t; + int r; + + assert(msg); + + r = sd_bus_message_new_method_return(msg, &reply); + if (r < 0) + return r; + + r = sd_bus_message_open_container(reply, 'a', "(usssdo)"); + if (r < 0) + return r; + + HASHMAP_FOREACH(t, m->transfers) { + + r = sd_bus_message_append( + reply, + "(usssdo)", + t->id, + transfer_type_to_string(t->type), + t->remote, + t->local, + transfer_percent_as_double(t), + t->object_path); + if (r < 0) + return r; + } + + r = sd_bus_message_close_container(reply); + if (r < 0) + return r; + + return sd_bus_send(NULL, reply, NULL); +} + +static int method_cancel(sd_bus_message *msg, void *userdata, sd_bus_error *error) { + Transfer *t = ASSERT_PTR(userdata); + int r; + + assert(msg); + + r = bus_verify_polkit_async( + msg, + CAP_SYS_ADMIN, + "org.freedesktop.import1.pull", + NULL, + false, + UID_INVALID, + &t->manager->polkit_registry, + error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = transfer_cancel(t); + if (r < 0) + return r; + + return sd_bus_reply_method_return(msg, NULL); +} + +static int method_cancel_transfer(sd_bus_message *msg, void *userdata, sd_bus_error *error) { + Manager *m = ASSERT_PTR(userdata); + Transfer *t; + uint32_t id; + int r; + + assert(msg); + + r = bus_verify_polkit_async( + msg, + CAP_SYS_ADMIN, + "org.freedesktop.import1.pull", + NULL, + false, + UID_INVALID, + &m->polkit_registry, + error); + if (r < 0) + return r; + if (r == 0) + return 1; /* Will call us back */ + + r = sd_bus_message_read(msg, "u", &id); + if (r < 0) + return r; + if (id <= 0) + return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid transfer id"); + + t = hashmap_get(m->transfers, UINT32_TO_PTR(id)); + if (!t) + return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_TRANSFER, "No transfer by id %" PRIu32, id); + + r = transfer_cancel(t); + if (r < 0) + return r; + + return sd_bus_reply_method_return(msg, NULL); +} + +static int property_get_progress( + sd_bus *bus, + const char *path, + const char *interface, + const char *property, + sd_bus_message *reply, + void *userdata, + sd_bus_error *error) { + + Transfer *t = ASSERT_PTR(userdata); + + assert(bus); + assert(reply); + + return sd_bus_message_append(reply, "d", transfer_percent_as_double(t)); +} + +static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, transfer_type, TransferType); +static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_verify, import_verify, ImportVerify); + +static int transfer_object_find( + sd_bus *bus, + const char *path, + const char *interface, + void *userdata, + void **found, + sd_bus_error *error) { + + Manager *m = ASSERT_PTR(userdata); + Transfer *t; + const char *p; + uint32_t id; + int r; + + assert(bus); + assert(path); + assert(interface); + assert(found); + + p = startswith(path, "/org/freedesktop/import1/transfer/_"); + if (!p) + return 0; + + r = safe_atou32(p, &id); + if (r < 0 || id == 0) + return 0; + + t = hashmap_get(m->transfers, UINT32_TO_PTR(id)); + if (!t) + return 0; + + *found = t; + return 1; +} + +static int transfer_node_enumerator( + sd_bus *bus, + const char *path, + void *userdata, + char ***nodes, + sd_bus_error *error) { + + _cleanup_strv_free_ char **l = NULL; + Manager *m = userdata; + Transfer *t; + unsigned k = 0; + + l = new0(char*, hashmap_size(m->transfers) + 1); + if (!l) + return -ENOMEM; + + HASHMAP_FOREACH(t, m->transfers) { + + l[k] = strdup(t->object_path); + if (!l[k]) + return -ENOMEM; + + k++; + } + + *nodes = TAKE_PTR(l); + + return 1; +} + +static const sd_bus_vtable transfer_vtable[] = { + SD_BUS_VTABLE_START(0), + + SD_BUS_PROPERTY("Id", "u", NULL, offsetof(Transfer, id), SD_BUS_VTABLE_PROPERTY_CONST), + SD_BUS_PROPERTY("Local", "s", NULL, offsetof(Transfer, local), SD_BUS_VTABLE_PROPERTY_CONST), + SD_BUS_PROPERTY("Remote", "s", NULL, offsetof(Transfer, remote), SD_BUS_VTABLE_PROPERTY_CONST), + SD_BUS_PROPERTY("Type", "s", property_get_type, offsetof(Transfer, type), SD_BUS_VTABLE_PROPERTY_CONST), + SD_BUS_PROPERTY("Verify", "s", property_get_verify, offsetof(Transfer, verify), SD_BUS_VTABLE_PROPERTY_CONST), + SD_BUS_PROPERTY("Progress", "d", property_get_progress, 0, 0), + + SD_BUS_METHOD("Cancel", NULL, NULL, method_cancel, SD_BUS_VTABLE_UNPRIVILEGED), + + SD_BUS_SIGNAL_WITH_NAMES("LogMessage", + "us", + SD_BUS_PARAM(priority) + SD_BUS_PARAM(line), + 0), + + SD_BUS_VTABLE_END, +}; + +static const BusObjectImplementation transfer_object = { + "/org/freedesktop/import1/transfer", + "org.freedesktop.import1.Transfer", + .fallback_vtables = BUS_FALLBACK_VTABLES({transfer_vtable, transfer_object_find}), + .node_enumerator = transfer_node_enumerator, +}; + +static const sd_bus_vtable manager_vtable[] = { + SD_BUS_VTABLE_START(0), + + SD_BUS_METHOD_WITH_NAMES("ImportTar", + "hsbb", + SD_BUS_PARAM(fd) + SD_BUS_PARAM(local_name) + SD_BUS_PARAM(force) + SD_BUS_PARAM(read_only), + "uo", + SD_BUS_PARAM(transfer_id) + SD_BUS_PARAM(transfer_path), + method_import_tar_or_raw, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_NAMES("ImportRaw", + "hsbb", + SD_BUS_PARAM(fd) + SD_BUS_PARAM(local_name) + SD_BUS_PARAM(force) + SD_BUS_PARAM(read_only), + "uo", + SD_BUS_PARAM(transfer_id) + SD_BUS_PARAM(transfer_path), + method_import_tar_or_raw, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_NAMES("ImportFileSystem", + "hsbb", + SD_BUS_PARAM(fd) + SD_BUS_PARAM(local_name) + SD_BUS_PARAM(force) + SD_BUS_PARAM(read_only), + "uo", + SD_BUS_PARAM(transfer_id) + SD_BUS_PARAM(transfer_path), + method_import_fs, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_NAMES("ExportTar", + "shs", + SD_BUS_PARAM(local_name) + SD_BUS_PARAM(fd) + SD_BUS_PARAM(format), + "uo", + SD_BUS_PARAM(transfer_id) + SD_BUS_PARAM(transfer_path), + method_export_tar_or_raw, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_NAMES("ExportRaw", + "shs", + SD_BUS_PARAM(local_name) + SD_BUS_PARAM(fd) + SD_BUS_PARAM(format), + "uo", + SD_BUS_PARAM(transfer_id) + SD_BUS_PARAM(transfer_path), + method_export_tar_or_raw, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_NAMES("PullTar", + "sssb", + SD_BUS_PARAM(url) + SD_BUS_PARAM(local_name) + SD_BUS_PARAM(verify_mode) + SD_BUS_PARAM(force), + "uo", + SD_BUS_PARAM(transfer_id) + SD_BUS_PARAM(transfer_path), + method_pull_tar_or_raw, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_NAMES("PullRaw", + "sssb", + SD_BUS_PARAM(url) + SD_BUS_PARAM(local_name) + SD_BUS_PARAM(verify_mode) + SD_BUS_PARAM(force), + "uo", + SD_BUS_PARAM(transfer_id) + SD_BUS_PARAM(transfer_path), + method_pull_tar_or_raw, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_NAMES("ListTransfers", + NULL,, + "a(usssdo)", + SD_BUS_PARAM(transfers), + method_list_transfers, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_NAMES("CancelTransfer", + "u", + SD_BUS_PARAM(transfer_id), + NULL,, + method_cancel_transfer, + SD_BUS_VTABLE_UNPRIVILEGED), + + SD_BUS_SIGNAL_WITH_NAMES("TransferNew", + "uo", + SD_BUS_PARAM(transfer_id) + SD_BUS_PARAM(transfer_path), + 0), + SD_BUS_SIGNAL_WITH_NAMES("TransferRemoved", + "uos", + SD_BUS_PARAM(transfer_id) + SD_BUS_PARAM(transfer_path) + SD_BUS_PARAM(result), + 0), + + SD_BUS_VTABLE_END, +}; + +static const BusObjectImplementation manager_object = { + "/org/freedesktop/import1", + "org.freedesktop.import1.Manager", + .vtables = BUS_VTABLES(manager_vtable), + .children = BUS_IMPLEMENTATIONS(&transfer_object), +}; + +static int manager_add_bus_objects(Manager *m) { + int r; + + assert(m); + + r = bus_add_implementation(m->bus, &manager_object, m); + if (r < 0) + return r; + + r = bus_log_control_api_register(m->bus); + if (r < 0) + return r; + + r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.import1", 0, NULL, NULL); + if (r < 0) + return log_error_errno(r, "Failed to request name: %m"); + + r = sd_bus_attach_event(m->bus, m->event, 0); + if (r < 0) + return log_error_errno(r, "Failed to attach bus to event loop: %m"); + + return 0; +} + +static bool manager_check_idle(void *userdata) { + Manager *m = userdata; + + return hashmap_isempty(m->transfers); +} + +static int manager_run(Manager *m) { + assert(m); + + return bus_event_loop_with_idle( + m->event, + m->bus, + "org.freedesktop.import1", + DEFAULT_EXIT_USEC, + manager_check_idle, + m); +} + +static void manager_parse_env(Manager *m) { + int r; + + assert(m); + + /* Same as src/import/{import,pull}.c: + * Let's make these relatively low-level settings also controllable via env vars. User can then set + * them for systemd-importd.service if they like to tweak behaviour */ + + r = getenv_bool("SYSTEMD_IMPORT_BTRFS_SUBVOL"); + if (r >= 0) + m->use_btrfs_subvol = r; + else if (r != -ENXIO) + log_warning_errno(r, "Failed to parse $SYSTEMD_IMPORT_BTRFS_SUBVOL: %m"); + + r = getenv_bool("SYSTEMD_IMPORT_BTRFS_QUOTA"); + if (r >= 0) + m->use_btrfs_quota = r; + else if (r != -ENXIO) + log_warning_errno(r, "Failed to parse $SYSTEMD_IMPORT_BTRFS_QUOTA: %m"); +} + +static int run(int argc, char *argv[]) { + _cleanup_(manager_unrefp) Manager *m = NULL; + int r; + + log_setup(); + + r = service_parse_argv("systemd-importd.service", + "VM and container image import and export service.", + BUS_IMPLEMENTATIONS(&manager_object, + &log_control_object), + argc, argv); + if (r <= 0) + return r; + + umask(0022); + + assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, -1) >= 0); + + r = manager_new(&m); + if (r < 0) + return log_error_errno(r, "Failed to allocate manager object: %m"); + + manager_parse_env(m); + + r = manager_add_bus_objects(m); + if (r < 0) + return r; + + r = manager_run(m); + if (r < 0) + return log_error_errno(r, "Failed to run event loop: %m"); + + return 0; +} + +DEFINE_MAIN_FUNCTION(run); |