diff options
Diffstat (limited to 'src/import/import-gpt.c')
| -rw-r--r-- | src/import/import-gpt.c | 504 |
1 files changed, 504 insertions, 0 deletions
diff --git a/src/import/import-gpt.c b/src/import/import-gpt.c new file mode 100644 index 0000000000..eda6dcacbc --- /dev/null +++ b/src/import/import-gpt.c @@ -0,0 +1,504 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2014 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 <sys/xattr.h> +#include <curl/curl.h> + +#include "hashmap.h" +#include "utf8.h" +#include "curl-util.h" +#include "import-gpt.h" + +typedef struct GptImportFile GptImportFile; + +struct GptImportFile { + GptImport *import; + + char *url; + char *local; + + CURL *curl; + struct curl_slist *request_header; + + char *temp_path; + char *final_path; + char *etag; + char *old_etag; + + uint64_t content_length; + uint64_t written; + + time_t mtime; + + bool force_local; + bool done; + + int disk_fd; +}; + +struct GptImport { + sd_event *event; + CurlGlue *glue; + + Hashmap *files; + + gpt_import_on_finished on_finished; + void *userdata; + + bool finished; +}; + +static GptImportFile *gpt_import_file_unref(GptImportFile *f) { + if (!f) + return NULL; + + if (f->import) + curl_glue_remove_and_free(f->import->glue, f->curl); + curl_slist_free_all(f->request_header); + + safe_close(f->disk_fd); + + free(f->final_path); + + if (f->temp_path) { + unlink(f->temp_path); + free(f->temp_path); + } + + free(f->url); + free(f->local); + free(f->etag); + free(f->old_etag); + free(f); + + return NULL; +} + +DEFINE_TRIVIAL_CLEANUP_FUNC(GptImportFile*, gpt_import_file_unref); + +static void gpt_import_finish(GptImport *import, int error) { + assert(import); + + if (import->finished) + return; + + import->finished = true; + + if (import->on_finished) + import->on_finished(import, error, import->userdata); + else + sd_event_exit(import->event, error); +} + +static void gpt_import_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result) { + GptImportFile *f = NULL; + struct stat st; + CURLcode code; + long status; + int r; + + if (curl_easy_getinfo(curl, CURLINFO_PRIVATE, &f) != CURLE_OK) + return; + + if (!f) + return; + + f->done = true; + + if (result != CURLE_OK) { + log_error("Transfer failed: %s", curl_easy_strerror(result)); + r = -EIO; + goto fail; + } + + code = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &status); + if (code != CURLE_OK) { + log_error("Failed to retrieve response code: %s", curl_easy_strerror(code)); + r = -EIO; + goto fail; + } else if (status == 304) { + log_info("File unmodified."); + r = 0; + goto fail; + } else if (status >= 300) { + log_error("HTTP request to %s failed with code %li.", f->url, status); + r = -EIO; + goto fail; + } else if (status < 200) { + log_error("HTTP request to %s finished with unexpected code %li.", f->url, status); + r = -EIO; + goto fail; + } + + if (f->disk_fd < 0) { + log_error("No data received."); + r = -EIO; + goto fail; + } + + if (f->content_length != (uint64_t) -1 && + f->content_length != f->written) { + log_error("Download truncated."); + r = -EIO; + goto fail; + } + + if (f->etag) + (void) fsetxattr(f->disk_fd, "user.etag", f->etag, strlen(f->etag), XATTR_CREATE); + + if (f->mtime != 0) { + struct timespec ut[2]; + + timespec_store(&ut[0], (usec_t) f->mtime * USEC_PER_SEC); + ut[1] = ut[0]; + + (void) futimens(f->disk_fd, ut); + } + + if (fstat(f->disk_fd, &st) < 0) { + r = log_error_errno(errno, "Failed to stat file: %m"); + goto fail; + } + + /* Mark read-only */ + (void) fchmod(f->disk_fd, st.st_mode & 07444); + + f->disk_fd = safe_close(f->disk_fd); + + assert(f->temp_path); + assert(f->final_path); + + r = rename(f->temp_path, f->final_path); + if (r < 0) { + r = log_error_errno(errno, "Failed to move GPT file into place: %m"); + goto fail; + } + + r = 0; + +fail: + gpt_import_finish(f->import, r); +} + +static int gpt_import_file_open_disk(GptImportFile *f) { + int r; + + assert(f); + + if (f->disk_fd >= 0) + return 0; + + assert(f->final_path); + + if (!f->temp_path) { + r = tempfn_random(f->final_path, &f->temp_path); + if (r < 0) + return log_oom(); + } + + f->disk_fd = open(f->temp_path, O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC|O_WRONLY, 0644); + if (f->disk_fd < 0) + return log_error_errno(errno, "Failed to create %s: %m", f->temp_path); + + return 0; +} + +static size_t gpt_import_file_write_callback(void *contents, size_t size, size_t nmemb, void *userdata) { + GptImportFile *f = userdata; + size_t sz = size * nmemb; + ssize_t n; + int r; + + assert(contents); + assert(f); + + r = gpt_import_file_open_disk(f); + if (r < 0) + goto fail; + + if (f->written + sz < f->written) { + log_error("File too large, overflow"); + r = -EOVERFLOW; + goto fail; + } + + if (f->content_length != (uint64_t) -1 && + f->written + sz > f->content_length) { + log_error("Content length incorrect."); + r = -EFBIG; + goto fail; + } + + n = write(f->disk_fd, contents, sz); + if (n < 0) { + log_error_errno(errno, "Failed to write file: %m"); + goto fail; + } + + if ((size_t) n < sz) { + log_error("Short write"); + r = -EIO; + goto fail; + } + + f->written += sz; + + return sz; + +fail: + gpt_import_finish(f->import, r); + return 0; +} + +static size_t gpt_import_file_header_callback(void *contents, size_t size, size_t nmemb, void *userdata) { + GptImportFile *f = userdata; + size_t sz = size * nmemb; + _cleanup_free_ char *length = NULL, *last_modified = NULL; + char *etag; + int r; + + assert(contents); + assert(f); + + r = curl_header_strdup(contents, sz, "ETag:", &etag); + if (r < 0) { + log_oom(); + goto fail; + } + if (r > 0) { + free(f->etag); + f->etag = etag; + + if (streq_ptr(f->old_etag, f->etag)) { + log_info("Image already up to date. Finishing."); + gpt_import_finish(f->import, 0); + return sz; + } + + return sz; + } + + r = curl_header_strdup(contents, sz, "Content-Length:", &length); + if (r < 0) { + log_oom(); + goto fail; + } + if (r > 0) { + (void) safe_atou64(length, &f->content_length); + return sz; + } + + r = curl_header_strdup(contents, sz, "Last-Modified:", &last_modified); + if (r < 0) { + log_oom(); + goto fail; + } + if (r > 0) { + (void) curl_parse_http_time(last_modified, &f->mtime); + return sz; + } + + return sz; + +fail: + gpt_import_finish(f->import, r); + return 0; +} + +static int gpt_import_file_begin(GptImportFile *f) { + int r; + + assert(f); + assert(!f->curl); + + log_info("Getting %s.", f->url); + + r = curl_glue_make(&f->curl, f->url, f); + if (r < 0) + return r; + + if (f->old_etag) { + const char *hdr; + + hdr = strappenda("If-None-Match: ", f->old_etag); + + f->request_header = curl_slist_new(hdr, NULL); + if (!f->request_header) + return -ENOMEM; + + if (curl_easy_setopt(f->curl, CURLOPT_HTTPHEADER, f->request_header) != CURLE_OK) + return -EIO; + } + + if (curl_easy_setopt(f->curl, CURLOPT_WRITEFUNCTION, gpt_import_file_write_callback) != CURLE_OK) + return -EIO; + + if (curl_easy_setopt(f->curl, CURLOPT_WRITEDATA, f) != CURLE_OK) + return -EIO; + + if (curl_easy_setopt(f->curl, CURLOPT_HEADERFUNCTION, gpt_import_file_header_callback) != CURLE_OK) + return -EIO; + + if (curl_easy_setopt(f->curl, CURLOPT_HEADERDATA, f) != CURLE_OK) + return -EIO; + + r = curl_glue_add(f->import->glue, f->curl); + if (r < 0) + return r; + + return 0; +} + +int gpt_import_new(GptImport **import, sd_event *event, gpt_import_on_finished on_finished, void *userdata) { + _cleanup_(gpt_import_unrefp) GptImport *i = NULL; + int r; + + assert(import); + + i = new0(GptImport, 1); + if (!i) + return -ENOMEM; + + i->on_finished = on_finished; + i->userdata = userdata; + + if (event) + i->event = sd_event_ref(event); + else { + r = sd_event_default(&i->event); + if (r < 0) + return r; + } + + r = curl_glue_new(&i->glue, i->event); + if (r < 0) + return r; + + i->glue->on_finished = gpt_import_curl_on_finished; + i->glue->userdata = i; + + *import = i; + i = NULL; + + return 0; +} + +GptImport* gpt_import_unref(GptImport *import) { + GptImportFile *f; + + if (!import) + return NULL; + + while ((f = hashmap_steal_first(import->files))) + gpt_import_file_unref(f); + hashmap_free(import->files); + + curl_glue_unref(import->glue); + sd_event_unref(import->event); + + free(import); + + return NULL; +} + +int gpt_import_cancel(GptImport *import, const char *url) { + GptImportFile *f; + + assert(import); + assert(url); + + f = hashmap_remove(import->files, url); + if (!f) + return 0; + + gpt_import_file_unref(f); + return 1; +} + +int gpt_import_pull(GptImport *import, const char *url, const char *local, bool force_local) { + _cleanup_(gpt_import_file_unrefp) GptImportFile *f = NULL; + char etag[LINE_MAX]; + ssize_t n; + int r; + + assert(import); + assert(gpt_url_is_valid(url)); + assert(machine_name_is_valid(local)); + + if (hashmap_get(import->files, url)) + return -EEXIST; + + r = hashmap_ensure_allocated(&import->files, &string_hash_ops); + if (r < 0) + return r; + + f = new0(GptImportFile, 1); + if (!f) + return -ENOMEM; + + f->import = import; + f->disk_fd = -1; + f->content_length = (uint64_t) -1; + + f->url = strdup(url); + if (!f->url) + return -ENOMEM; + + f->local = strdup(local); + if (!f->local) + return -ENOMEM; + + f->final_path = strjoin("/var/lib/container/", local, ".gpt", NULL); + if (!f->final_path) + return -ENOMEM; + + n = getxattr(f->final_path, "user.etag", etag, sizeof(etag)); + if (n > 0) { + f->old_etag = strndup(etag, n); + if (!f->old_etag) + return -ENOMEM; + } + + r = hashmap_put(import->files, f->url, f); + if (r < 0) + return r; + + r = gpt_import_file_begin(f); + if (r < 0) { + gpt_import_cancel(import, f->url); + f = NULL; + return r; + } + + f = NULL; + return 0; +} + +bool gpt_url_is_valid(const char *url) { + if (isempty(url)) + return false; + + if (!startswith(url, "http://") && + !startswith(url, "https://")) + return false; + + return ascii_is_valid(url); +} |