Adding upstream version 241.upstream/241upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 636 insertions, 0 deletions

diff --git a/src/import/pull-job.c b/src/import/pull-job.c
new file mode 100644
index 0000000..6881bd6
--- /dev/null
+++ b/src/import/pull-job.c
@@ -0,0 +1,636 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <sys/xattr.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "gcrypt-util.h"
+#include "hexdecoct.h"
+#include "import-util.h"
+#include "io-util.h"
+#include "machine-pool.h"
+#include "parse-util.h"
+#include "pull-common.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);
+
+        return mfree(j);
+}
+
+static void pull_job_finish(PullJob *j, int ret) {
+        assert(j);
+
+        if (IN_SET(j->state, PULL_JOB_DONE, 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);
+}
+
+static int pull_job_restart(PullJob *j) {
+        int r;
+        char *chksum_url = NULL;
+
+        r = import_url_change_last_component(j->url, "SHA256SUMS", &chksum_url);
+        if (r < 0)
+                return r;
+
+        free(j->url);
+        j->url = chksum_url;
+        j->state = PULL_JOB_INIT;
+        j->payload = mfree(j->payload);
+        j->payload_size = 0;
+        j->payload_allocated = 0;
+        j->written_compressed = 0;
+        j->written_uncompressed = 0;
+
+        r = pull_job_begin(j);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+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 || IN_SET(j->state, PULL_JOB_DONE, 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) {
+                if (status == 404 && j->style == VERIFICATION_PER_FILE) {
+
+                        /* retry pull job with SHA256SUMS file */
+                        r = pull_job_restart(j);
+                        if (r < 0)
+                                goto finish;
+
+                        code = curl_easy_getinfo(j->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;
+                        }
+
+                        if (status == 0) {
+                                j->style = VERIFICATION_PER_DIRECTORY;
+                                return;
+                        }
+                }
+
+                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)
+                return log_error_errno(SYNTHETIC_ERRNO(EOVERFLOW),
+                                       "File too large, overflow");
+
+        if (j->written_uncompressed + sz > j->uncompressed_max)
+                return log_error_errno(SYNTHETIC_ERRNO(EFBIG),
+                                       "File overly large, refusing");
+
+        if (j->disk_fd >= 0) {
+
+                if (j->allow_sparse)
+                        n = sparse_write(j->disk_fd, p, sz, 64);
+                else {
+                        n = write(j->disk_fd, p, sz);
+                        if (n < 0)
+                                n = -errno;
+                }
+                if (n < 0)
+                        return log_error_errno((int) n, "Failed to write file: %m");
+                if ((size_t) n < sz)
+                        return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short write");
+        } 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;
+
+        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)
+                return log_error_errno(SYNTHETIC_ERRNO(EOVERFLOW), "File too large, overflow");
+
+        if (j->written_compressed + sz > j->compressed_max)
+                return log_error_errno(SYNTHETIC_ERRNO(EFBIG), "File overly large, refusing.");
+
+        if (j->content_length != (uint64_t) -1 &&
+            j->written_compressed + sz > j->content_length)
+                return log_error_errno(SYNTHETIC_ERRNO(EFBIG),
+                                       "Content length incorrect.");
+
+        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) {
+                initialize_libgcrypt(false);
+
+                if (gcry_md_open(&j->checksum_context, GCRY_MD_SHA256, 0) != 0)
+                        return log_error_errno(SYNTHETIC_ERRNO(EIO),
+                                               "Failed to initialize hash context.");
+        }
+
+        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 (IN_SET(j->state, PULL_JOB_DONE, 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;
+        _cleanup_free_ char *u = NULL;
+
+        assert(url);
+        assert(glue);
+        assert(ret);
+
+        u = strdup(url);
+        if (!u)
+                return -ENOMEM;
+
+        j = new(PullJob, 1);
+        if (!j)
+                return -ENOMEM;
+
+        *j = (PullJob) {
+                .state = PULL_JOB_INIT,
+                .disk_fd = -1,
+                .userdata = userdata,
+                .glue = glue,
+                .content_length = (uint64_t) -1,
+                .start_usec = now(CLOCK_MONOTONIC),
+                .compressed_max = 64LLU * 1024LLU * 1024LLU * 1024LLU, /* 64GB safety limit */
+                .uncompressed_max = 64LLU * 1024LLU * 1024LLU * 1024LLU, /* 64GB safety limit */
+                .style = VERIFICATION_STYLE_UNSET,
+                .url = TAKE_PTR(u),
+        };
+
+        *ret = TAKE_PTR(j);
+
+        return 0;
+}
+
+int pull_job_begin(PullJob *j) {
+        int r;
+
+        assert(j);
+
+        if (j->state != PULL_JOB_INIT)
+                return -EBUSY;
+
+        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;
+}