| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| |
| /* Copyright © 2019 Oracle and/or its affiliates. */ |
| |
| /* Generally speaking, the pstore contains a small number of files |
| * that in turn contain a small amount of data. */ |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdio_ext.h> |
| #include <sys/prctl.h> |
| #include <sys/xattr.h> |
| #include <unistd.h> |
| |
| #include "sd-daemon.h" |
| #include "sd-journal.h" |
| #include "sd-login.h" |
| #include "sd-messages.h" |
| |
| #include "acl-util.h" |
| #include "alloc-util.h" |
| #include "capability-util.h" |
| #include "cgroup-util.h" |
| #include "compress.h" |
| #include "conf-parser.h" |
| #include "copy.h" |
| #include "dirent-util.h" |
| #include "escape.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "fs-util.h" |
| #include "io-util.h" |
| #include "journal-importer.h" |
| #include "log.h" |
| #include "macro.h" |
| #include "main-func.h" |
| #include "missing.h" |
| #include "mkdir.h" |
| #include "parse-util.h" |
| #include "process-util.h" |
| #include "signal-util.h" |
| #include "socket-util.h" |
| #include "special.h" |
| #include "sort-util.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "tmpfile-util.h" |
| #include "user-util.h" |
| #include "util.h" |
| |
| /* Command line argument handling */ |
| typedef enum PStoreStorage { |
| PSTORE_STORAGE_NONE, |
| PSTORE_STORAGE_EXTERNAL, |
| PSTORE_STORAGE_JOURNAL, |
| _PSTORE_STORAGE_MAX, |
| _PSTORE_STORAGE_INVALID = -1 |
| } PStoreStorage; |
| |
| static const char* const pstore_storage_table[_PSTORE_STORAGE_MAX] = { |
| [PSTORE_STORAGE_NONE] = "none", |
| [PSTORE_STORAGE_EXTERNAL] = "external", |
| [PSTORE_STORAGE_JOURNAL] = "journal", |
| }; |
| |
| DEFINE_PRIVATE_STRING_TABLE_LOOKUP(pstore_storage, PStoreStorage); |
| static DEFINE_CONFIG_PARSE_ENUM(config_parse_pstore_storage, pstore_storage, PStoreStorage, "Failed to parse storage setting"); |
| |
| static PStoreStorage arg_storage = PSTORE_STORAGE_EXTERNAL; |
| |
| static bool arg_unlink = true; |
| static const char *arg_sourcedir = "/sys/fs/pstore"; |
| static const char *arg_archivedir = "/var/lib/systemd/pstore"; |
| |
| static int parse_config(void) { |
| static const ConfigTableItem items[] = { |
| { "PStore", "Unlink", config_parse_bool, 0, &arg_unlink }, |
| { "PStore", "Storage", config_parse_pstore_storage, 0, &arg_storage }, |
| {} |
| }; |
| |
| return config_parse_many_nulstr(PKGSYSCONFDIR "/pstore.conf", |
| CONF_PATHS_NULSTR("systemd/pstore.conf.d"), |
| "PStore\0", |
| config_item_table_lookup, items, |
| CONFIG_PARSE_WARN, NULL); |
| } |
| |
| /* File list handling - PStoreEntry is the struct and |
| * and PStoreEntry is the type that contains all info |
| * about a pstore entry. */ |
| typedef struct PStoreEntry { |
| struct dirent dirent; |
| bool is_binary; |
| bool handled; |
| char *content; |
| size_t content_size; |
| } PStoreEntry; |
| |
| typedef struct PStoreList { |
| PStoreEntry *entries; |
| size_t n_entries; |
| size_t n_entries_allocated; |
| } PStoreList; |
| |
| static void pstore_entries_reset(PStoreList *list) { |
| for (size_t i = 0; i < list->n_entries; i++) |
| free(list->entries[i].content); |
| free(list->entries); |
| list->n_entries = 0; |
| } |
| |
| static int compare_pstore_entries(const void *_a, const void *_b) { |
| PStoreEntry *a = (PStoreEntry *)_a, *b = (PStoreEntry *)_b; |
| return strcmp(a->dirent.d_name, b->dirent.d_name); |
| } |
| |
| static int move_file(PStoreEntry *pe, const char *subdir) { |
| _cleanup_free_ char *ifd_path = NULL, *ofd_path = NULL; |
| const char *suffix, *message; |
| struct iovec iovec[2]; |
| int n_iovec = 0, r; |
| |
| if (pe->handled) |
| return 0; |
| |
| ifd_path = path_join(arg_sourcedir, pe->dirent.d_name); |
| if (!ifd_path) |
| return log_oom(); |
| |
| ofd_path = path_join(arg_archivedir, subdir, pe->dirent.d_name); |
| if (!ofd_path) |
| return log_oom(); |
| |
| /* Always log to the journal */ |
| suffix = arg_storage == PSTORE_STORAGE_EXTERNAL ? strjoina(" moved to ", ofd_path) : (char *)"."; |
| message = strjoina("MESSAGE=PStore ", pe->dirent.d_name, suffix); |
| iovec[n_iovec++] = IOVEC_MAKE_STRING(message); |
| |
| if (pe->content_size > 0) { |
| _cleanup_free_ void *field = NULL; |
| size_t field_size; |
| |
| field_size = strlen("FILE=") + pe->content_size; |
| field = malloc(field_size); |
| if (!field) |
| return log_oom(); |
| memcpy(stpcpy(field, "FILE="), pe->content, pe->content_size); |
| iovec[n_iovec++] = IOVEC_MAKE(field, field_size); |
| } |
| |
| r = sd_journal_sendv(iovec, n_iovec); |
| if (r < 0) |
| return log_error_errno(r, "Failed to log pstore entry: %m"); |
| |
| if (arg_storage == PSTORE_STORAGE_EXTERNAL) { |
| /* Move file from pstore to external storage */ |
| r = mkdir_parents(ofd_path, 0755); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create directoy %s: %m", ofd_path); |
| r = copy_file_atomic(ifd_path, ofd_path, 0600, 0, 0, COPY_REPLACE); |
| if (r < 0) |
| return log_error_errno(r, "Failed to copy_file_atomic: %s to %s", ifd_path, ofd_path); |
| } |
| |
| /* If file copied properly, remove it from pstore */ |
| if (arg_unlink) |
| (void) unlink(ifd_path); |
| |
| pe->handled = true; |
| |
| return 0; |
| } |
| |
| static int write_dmesg(const char *dmesg, size_t size, const char *id) { |
| _cleanup_(unlink_and_freep) char *tmp_path = NULL; |
| _cleanup_free_ char *ofd_path = NULL; |
| _cleanup_close_ int ofd = -1; |
| ssize_t wr; |
| int r; |
| |
| if (isempty(dmesg) || size == 0) |
| return 0; |
| |
| ofd_path = path_join(arg_archivedir, id, "dmesg.txt"); |
| if (!ofd_path) |
| return log_oom(); |
| |
| ofd = open_tmpfile_linkable(ofd_path, O_CLOEXEC|O_CREAT|O_TRUNC|O_WRONLY, &tmp_path); |
| if (ofd < 0) |
| return log_error_errno(ofd, "Failed to open temporary file %s: %m", ofd_path); |
| wr = write(ofd, dmesg, size); |
| if (wr < 0) |
| return log_error_errno(errno, "Failed to store dmesg to %s: %m", ofd_path); |
| if (wr != (ssize_t)size) |
| return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to store dmesg to %s. %zu bytes are lost.", ofd_path, size - wr); |
| r = link_tmpfile(ofd, tmp_path, ofd_path); |
| if (r < 0) |
| return log_error_errno(r, "Failed to write temporary file %s: %m", ofd_path); |
| tmp_path = mfree(tmp_path); |
| |
| return 0; |
| } |
| |
| static void process_dmesg_files(PStoreList *list) { |
| /* Move files, reconstruct dmesg.txt */ |
| _cleanup_free_ char *dmesg = NULL, *dmesg_id = NULL; |
| size_t dmesg_size = 0; |
| PStoreEntry *pe; |
| |
| /* Handle each dmesg file: files processed in reverse |
| * order so as to properly reconstruct original dmesg */ |
| for (size_t n = list->n_entries; n > 0; n--) { |
| bool move_file_and_continue = false; |
| _cleanup_free_ char *pe_id = NULL; |
| char *p; |
| size_t plen; |
| |
| pe = &list->entries[n-1]; |
| |
| if (pe->handled) |
| continue; |
| if (!startswith(pe->dirent.d_name, "dmesg-")) |
| continue; |
| |
| if (endswith(pe->dirent.d_name, ".enc.z")) /* indicates a problem */ |
| move_file_and_continue = true; |
| p = strrchr(pe->dirent.d_name, '-'); |
| if (!p) |
| move_file_and_continue = true; |
| |
| if (move_file_and_continue) { |
| /* A dmesg file on which we do NO additional processing */ |
| (void) move_file(pe, NULL); |
| continue; |
| } |
| |
| /* See if this file is one of a related group of files |
| * in order to reconstruct dmesg */ |
| |
| /* When dmesg is written into pstore, it is done so in |
| * small chunks, whatever the exchange buffer size is |
| * with the underlying pstore backend (ie. EFI may be |
| * ~2KiB), which means an example pstore with approximately |
| * 64KB of storage may have up to roughly 32 dmesg files |
| * that could be related, depending upon the size of the |
| * original dmesg. |
| * |
| * Here we look at the dmesg filename and try to discern |
| * if files are part of a related group, meaning the same |
| * original dmesg. |
| * |
| * The two known pstore backends are EFI and ERST. These |
| * backends store data in the Common Platform Error |
| * Record, CPER, format. The dmesg- filename contains the |
| * CPER record id, a 64bit number (in decimal notation). |
| * In Linux, the record id is encoded with two digits for |
| * the dmesg part (chunk) number and 3 digits for the |
| * count number. So allowing an additional digit to |
| * compensate for advancing time, this code ignores the |
| * last six digits of the filename in determining the |
| * record id. |
| * |
| * For the EFI backend, the record id encodes an id in the |
| * upper 32 bits, and a timestamp in the lower 32-bits. |
| * So ignoring the least significant 6 digits has proven |
| * to generally identify related dmesg entries. */ |
| #define PSTORE_FILENAME_IGNORE 6 |
| |
| /* determine common portion of record id */ |
| ++p; /* move beyond dmesg- */ |
| plen = strlen(p); |
| if (plen > PSTORE_FILENAME_IGNORE) { |
| pe_id = memdup_suffix0(p, plen - PSTORE_FILENAME_IGNORE); |
| if (!pe_id) { |
| log_oom(); |
| return; |
| } |
| } else |
| pe_id = mfree(pe_id); |
| |
| /* Now move file from pstore to archive storage */ |
| move_file(pe, pe_id); |
| |
| /* If the current record id is NOT the same as the |
| * previous record id, then start a new dmesg.txt file */ |
| if (!pe_id || !dmesg_id || !streq(pe_id, dmesg_id)) { |
| /* Encountered a new dmesg group, close out old one, open new one */ |
| if (dmesg) { |
| (void) write_dmesg(dmesg, dmesg_size, dmesg_id); |
| dmesg = mfree(dmesg); |
| dmesg_size = 0; |
| } |
| |
| /* now point dmesg_id to storage of pe_id */ |
| free_and_replace(dmesg_id, pe_id); |
| } |
| |
| /* Reconstruction of dmesg is done as a useful courtesy, do not log errors */ |
| dmesg = realloc(dmesg, dmesg_size + strlen(pe->dirent.d_name) + strlen(":\n") + pe->content_size + 1); |
| if (dmesg) { |
| dmesg_size += sprintf(&dmesg[dmesg_size], "%s:\n", pe->dirent.d_name); |
| if (pe->content) { |
| memcpy(&dmesg[dmesg_size], pe->content, pe->content_size); |
| dmesg_size += pe->content_size; |
| } |
| } |
| |
| pe_id = mfree(pe_id); |
| } |
| if (dmesg) |
| (void) write_dmesg(dmesg, dmesg_size, dmesg_id); |
| } |
| |
| static int list_files(PStoreList *list, const char *sourcepath) { |
| _cleanup_(closedirp) DIR *dirp = NULL; |
| struct dirent *de; |
| int r; |
| |
| dirp = opendir(sourcepath); |
| if (!dirp) |
| return log_error_errno(errno, "Failed to opendir %s: %m", sourcepath); |
| |
| FOREACH_DIRENT(de, dirp, return log_error_errno(errno, "Failed to iterate through %s: %m", sourcepath)) { |
| _cleanup_free_ char *ifd_path = NULL; |
| |
| ifd_path = path_join(sourcepath, de->d_name); |
| if (!ifd_path) |
| return log_oom(); |
| |
| _cleanup_free_ char *buf = NULL; |
| size_t buf_size; |
| |
| /* Now read contents of pstore file */ |
| r = read_full_file(ifd_path, &buf, &buf_size); |
| if (r < 0) { |
| log_warning_errno(r, "Failed to read file %s, skipping: %m", ifd_path); |
| continue; |
| } |
| |
| if (!GREEDY_REALLOC(list->entries, list->n_entries_allocated, list->n_entries + 1)) |
| return log_oom(); |
| |
| list->entries[list->n_entries++] = (PStoreEntry) { |
| .dirent = *de, |
| .content = TAKE_PTR(buf), |
| .content_size = buf_size, |
| .is_binary = true, |
| .handled = false, |
| }; |
| } |
| |
| return 0; |
| } |
| |
| static int run(int argc, char *argv[]) { |
| _cleanup_(pstore_entries_reset) PStoreList list = {}; |
| int r; |
| |
| log_setup_service(); |
| |
| if (argc > 1) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "This program takes no arguments."); |
| |
| /* Ignore all parse errors */ |
| (void) parse_config(); |
| |
| log_debug("Selected storage '%s'.", pstore_storage_to_string(arg_storage)); |
| log_debug("Selected Unlink '%d'.", arg_unlink); |
| |
| if (arg_storage == PSTORE_STORAGE_NONE) |
| /* Do nothing, intentionally, leaving pstore untouched */ |
| return 0; |
| |
| /* Obtain list of files in pstore */ |
| r = list_files(&list, arg_sourcedir); |
| if (r < 0) |
| return r; |
| |
| /* Handle each pstore file */ |
| /* Sort files lexigraphically ascending, generally needed by all */ |
| qsort_safe(list.entries, list.n_entries, sizeof(PStoreEntry), compare_pstore_entries); |
| |
| /* Process known file types */ |
| process_dmesg_files(&list); |
| |
| /* Move left over files out of pstore */ |
| for (size_t n = 0; n < list.n_entries; n++) |
| move_file(&list.entries[n], NULL); |
| |
| return 0; |
| } |
| |
| DEFINE_MAIN_FUNCTION(run); |