/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2015 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 "alloc-util.h" #include "fd-util.h" #include "hexdecoct.h" #include "io-util.h" #include "machine-pool.h" #include "parse-util.h" #include "pull-job.h" #include "string-util.h" #include "strv.h" #include "xattr-util.h" PullJob* pull_job_unref(PullJob *j) { if (!j) return NULL; curl_glue_remove_and_free(j->glue, j->curl); curl_slist_free_all(j->request_header); safe_close(j->disk_fd); import_compress_free(&j->compress); if (j->checksum_context) gcry_md_close(j->checksum_context); free(j->url); free(j->etag); strv_free(j->old_etags); free(j->payload); free(j->checksum); free(j); return NULL; } static void pull_job_finish(PullJob *j, int ret) { assert(j); if (j->state == PULL_JOB_DONE || j->state == PULL_JOB_FAILED) return; if (ret == 0) { j->state = PULL_JOB_DONE; j->progress_percent = 100; log_info("Download of %s complete.", j->url); } else { j->state = PULL_JOB_FAILED; j->error = ret; } if (j->on_finished) j->on_finished(j); } void pull_job_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result) { PullJob *j = NULL; CURLcode code; long status; int r; if (curl_easy_getinfo(curl, CURLINFO_PRIVATE, (char **)&j) != CURLE_OK) return; if (!j || j->state == PULL_JOB_DONE || j->state == PULL_JOB_FAILED) return; if (result != CURLE_OK) { log_error("Transfer failed: %s", curl_easy_strerror(result)); r = -EIO; goto finish; } 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 finish; } else if (status == 304) { log_info("Image already downloaded. Skipping download."); j->etag_exists = true; r = 0; goto finish; } else if (status >= 300) { log_error("HTTP request to %s failed with code %li.", j->url, status); r = -EIO; goto finish; } else if (status < 200) { log_error("HTTP request to %s finished with unexpected code %li.", j->url, status); r = -EIO; goto finish; } if (j->state != PULL_JOB_RUNNING) { log_error("Premature connection termination."); r = -EIO; goto finish; } if (j->content_length != (uint64_t) -1 && j->content_length != j->written_compressed) { log_error("Download truncated."); r = -EIO; goto finish; } if (j->checksum_context) { uint8_t *k; k = gcry_md_read(j->checksum_context, GCRY_MD_SHA256); if (!k) { log_error("Failed to get checksum."); r = -EIO; goto finish; } j->checksum = hexmem(k, gcry_md_get_algo_dlen(GCRY_MD_SHA256)); if (!j->checksum) { r = log_oom(); goto finish; } log_debug("SHA256 of %s is %s.", j->url, j->checksum); } if (j->disk_fd >= 0 && j->allow_sparse) { /* Make sure the file size is right, in case the file was * sparse and we just seeked for the last part */ if (ftruncate(j->disk_fd, j->written_uncompressed) < 0) { r = log_error_errno(errno, "Failed to truncate file: %m"); goto finish; } if (j->etag) (void) fsetxattr(j->disk_fd, "user.source_etag", j->etag, strlen(j->etag), 0); if (j->url) (void) fsetxattr(j->disk_fd, "user.source_url", j->url, strlen(j->url), 0); if (j->mtime != 0) { struct timespec ut[2]; timespec_store(&ut[0], j->mtime); ut[1] = ut[0]; (void) futimens(j->disk_fd, ut); (void) fd_setcrtime(j->disk_fd, j->mtime); } } r = 0; finish: pull_job_finish(j, r); } static int pull_job_write_uncompressed(const void *p, size_t sz, void *userdata) { PullJob *j = userdata; ssize_t n; assert(j); assert(p); if (sz <= 0) return 0; if (j->written_uncompressed + sz < j->written_uncompressed) { log_error("File too large, overflow"); return -EOVERFLOW; } if (j->written_uncompressed + sz > j->uncompressed_max) { log_error("File overly large, refusing"); return -EFBIG; } if (j->disk_fd >= 0) { if (j->grow_machine_directory && j->written_since_last_grow >= GROW_INTERVAL_BYTES) { j->written_since_last_grow = 0; grow_machine_directory(); } if (j->allow_sparse) n = sparse_write(j->disk_fd, p, sz, 64); else n = write(j->disk_fd, p, sz); if (n < 0) return log_error_errno(errno, "Failed to write file: %m"); if ((size_t) n < sz) { log_error("Short write"); return -EIO; } } else { if (!GREEDY_REALLOC(j->payload, j->payload_allocated, j->payload_size + sz)) return log_oom(); memcpy(j->payload + j->payload_size, p, sz); j->payload_size += sz; } j->written_uncompressed += sz; j->written_since_last_grow += sz; return 0; } static int pull_job_write_compressed(PullJob *j, void *p, size_t sz) { int r; assert(j); assert(p); if (sz <= 0) return 0; if (j->written_compressed + sz < j->written_compressed) { log_error("File too large, overflow"); return -EOVERFLOW; } if (j->written_compressed + sz > j->compressed_max) { log_error("File overly large, refusing."); return -EFBIG; } if (j->content_length != (uint64_t) -1 && j->written_compressed + sz > j->content_length) { log_error("Content length incorrect."); return -EFBIG; } if (j->checksum_context) gcry_md_write(j->checksum_context, p, sz); r = import_uncompress(&j->compress, p, sz, pull_job_write_uncompressed, j); if (r < 0) return r; j->written_compressed += sz; return 0; } static int pull_job_open_disk(PullJob *j) { int r; assert(j); if (j->on_open_disk) { r = j->on_open_disk(j); if (r < 0) return r; } if (j->disk_fd >= 0) { /* Check if we can do sparse files */ if (lseek(j->disk_fd, SEEK_SET, 0) == 0) j->allow_sparse = true; else { if (errno != ESPIPE) return log_error_errno(errno, "Failed to seek on file descriptor: %m"); j->allow_sparse = false; } } if (j->calc_checksum) { if (gcry_md_open(&j->checksum_context, GCRY_MD_SHA256, 0) != 0) { log_error("Failed to initialize hash context."); return -EIO; } } return 0; } static int pull_job_detect_compression(PullJob *j) { _cleanup_free_ uint8_t *stub = NULL; size_t stub_size; int r; assert(j); r = import_uncompress_detect(&j->compress, j->payload, j->payload_size); if (r < 0) return log_error_errno(r, "Failed to initialize compressor: %m"); if (r == 0) return 0; log_debug("Stream is compressed: %s", import_compress_type_to_string(j->compress.type)); r = pull_job_open_disk(j); if (r < 0) return r; /* Now, take the payload we read so far, and decompress it */ stub = j->payload; stub_size = j->payload_size; j->payload = NULL; j->payload_size = 0; j->payload_allocated = 0; j->state = PULL_JOB_RUNNING; r = pull_job_write_compressed(j, stub, stub_size); if (r < 0) return r; return 0; } static size_t pull_job_write_callback(void *contents, size_t size, size_t nmemb, void *userdata) { PullJob *j = userdata; size_t sz = size * nmemb; int r; assert(contents); assert(j); switch (j->state) { case PULL_JOB_ANALYZING: /* Let's first check what it actually is */ if (!GREEDY_REALLOC(j->payload, j->payload_allocated, j->payload_size + sz)) { r = log_oom(); goto fail; } memcpy(j->payload + j->payload_size, contents, sz); j->payload_size += sz; r = pull_job_detect_compression(j); if (r < 0) goto fail; break; case PULL_JOB_RUNNING: r = pull_job_write_compressed(j, contents, sz); if (r < 0) goto fail; break; case PULL_JOB_DONE: case PULL_JOB_FAILED: r = -ESTALE; goto fail; default: assert_not_reached("Impossible state."); } return sz; fail: pull_job_finish(j, r); return 0; } static size_t pull_job_header_callback(void *contents, size_t size, size_t nmemb, void *userdata) { PullJob *j = userdata; size_t sz = size * nmemb; _cleanup_free_ char *length = NULL, *last_modified = NULL; char *etag; int r; assert(contents); assert(j); if (j->state == PULL_JOB_DONE || j->state == PULL_JOB_FAILED) { r = -ESTALE; goto fail; } assert(j->state == PULL_JOB_ANALYZING); r = curl_header_strdup(contents, sz, "ETag:", &etag); if (r < 0) { log_oom(); goto fail; } if (r > 0) { free(j->etag); j->etag = etag; if (strv_contains(j->old_etags, j->etag)) { log_info("Image already downloaded. Skipping download."); j->etag_exists = true; pull_job_finish(j, 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, &j->content_length); if (j->content_length != (uint64_t) -1) { char bytes[FORMAT_BYTES_MAX]; if (j->content_length > j->compressed_max) { log_error("Content too large."); r = -EFBIG; goto fail; } log_info("Downloading %s for %s.", format_bytes(bytes, sizeof(bytes), j->content_length), j->url); } 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, &j->mtime); return sz; } if (j->on_header) { r = j->on_header(j, contents, sz); if (r < 0) goto fail; } return sz; fail: pull_job_finish(j, r); return 0; } static int pull_job_progress_callback(void *userdata, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow) { PullJob *j = userdata; unsigned percent; usec_t n; assert(j); if (dltotal <= 0) return 0; percent = ((100 * dlnow) / dltotal); n = now(CLOCK_MONOTONIC); if (n > j->last_status_usec + USEC_PER_SEC && percent != j->progress_percent && dlnow < dltotal) { char buf[FORMAT_TIMESPAN_MAX]; if (n - j->start_usec > USEC_PER_SEC && dlnow > 0) { char y[FORMAT_BYTES_MAX]; usec_t left, done; done = n - j->start_usec; left = (usec_t) (((double) done * (double) dltotal) / dlnow) - done; log_info("Got %u%% of %s. %s left at %s/s.", percent, j->url, format_timespan(buf, sizeof(buf), left, USEC_PER_SEC), format_bytes(y, sizeof(y), (uint64_t) ((double) dlnow / ((double) done / (double) USEC_PER_SEC)))); } else log_info("Got %u%% of %s.", percent, j->url); j->progress_percent = percent; j->last_status_usec = n; if (j->on_progress) j->on_progress(j); } return 0; } int pull_job_new(PullJob **ret, const char *url, CurlGlue *glue, void *userdata) { _cleanup_(pull_job_unrefp) PullJob *j = NULL; assert(url); assert(glue); assert(ret); j = new0(PullJob, 1); if (!j) return -ENOMEM; j->state = PULL_JOB_INIT; j->disk_fd = -1; j->userdata = userdata; j->glue = glue; j->content_length = (uint64_t) -1; j->start_usec = now(CLOCK_MONOTONIC); j->compressed_max = j->uncompressed_max = 8LLU * 1024LLU * 1024LLU * 1024LLU; /* 8GB */ j->url = strdup(url); if (!j->url) return -ENOMEM; *ret = j; j = NULL; return 0; } int pull_job_begin(PullJob *j) { int r; assert(j); if (j->state != PULL_JOB_INIT) return -EBUSY; if (j->grow_machine_directory) grow_machine_directory(); r = curl_glue_make(&j->curl, j->url, j); if (r < 0) return r; if (!strv_isempty(j->old_etags)) { _cleanup_free_ char *cc = NULL, *hdr = NULL; cc = strv_join(j->old_etags, ", "); if (!cc) return -ENOMEM; hdr = strappend("If-None-Match: ", cc); if (!hdr) return -ENOMEM; if (!j->request_header) { j->request_header = curl_slist_new(hdr, NULL); if (!j->request_header) return -ENOMEM; } else { struct curl_slist *l; l = curl_slist_append(j->request_header, hdr); if (!l) return -ENOMEM; j->request_header = l; } } if (j->request_header) { if (curl_easy_setopt(j->curl, CURLOPT_HTTPHEADER, j->request_header) != CURLE_OK) return -EIO; } if (curl_easy_setopt(j->curl, CURLOPT_WRITEFUNCTION, pull_job_write_callback) != CURLE_OK) return -EIO; if (curl_easy_setopt(j->curl, CURLOPT_WRITEDATA, j) != CURLE_OK) return -EIO; if (curl_easy_setopt(j->curl, CURLOPT_HEADERFUNCTION, pull_job_header_callback) != CURLE_OK) return -EIO; if (curl_easy_setopt(j->curl, CURLOPT_HEADERDATA, j) != CURLE_OK) return -EIO; if (curl_easy_setopt(j->curl, CURLOPT_XFERINFOFUNCTION, pull_job_progress_callback) != CURLE_OK) return -EIO; if (curl_easy_setopt(j->curl, CURLOPT_XFERINFODATA, j) != CURLE_OK) return -EIO; if (curl_easy_setopt(j->curl, CURLOPT_NOPROGRESS, 0) != CURLE_OK) return -EIO; r = curl_glue_add(j->glue, j->curl); if (r < 0) return r; j->state = PULL_JOB_ANALYZING; return 0; }