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-rw-r--r--src/shared/journal-importer.c504
1 files changed, 504 insertions, 0 deletions
diff --git a/src/shared/journal-importer.c b/src/shared/journal-importer.c
new file mode 100644
index 0000000..8638cd3
--- /dev/null
+++ b/src/shared/journal-importer.c
@@ -0,0 +1,504 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "io-util.h"
+#include "journal-file.h"
+#include "journal-importer.h"
+#include "journal-util.h"
+#include "parse-util.h"
+#include "string-util.h"
+#include "unaligned.h"
+
+enum {
+ IMPORTER_STATE_LINE = 0, /* waiting to read, or reading line */
+ IMPORTER_STATE_DATA_START, /* reading binary data header */
+ IMPORTER_STATE_DATA, /* reading binary data */
+ IMPORTER_STATE_DATA_FINISH, /* expecting newline */
+ IMPORTER_STATE_EOF, /* done */
+};
+
+static int iovw_put(struct iovec_wrapper *iovw, void* data, size_t len) {
+ if (iovw->count >= ENTRY_FIELD_COUNT_MAX)
+ return -E2BIG;
+
+ if (!GREEDY_REALLOC(iovw->iovec, iovw->size_bytes, iovw->count + 1))
+ return log_oom();
+
+ iovw->iovec[iovw->count++] = IOVEC_MAKE(data, len);
+ return 0;
+}
+
+static void iovw_free_contents(struct iovec_wrapper *iovw) {
+ iovw->iovec = mfree(iovw->iovec);
+ iovw->size_bytes = iovw->count = 0;
+}
+
+static void iovw_rebase(struct iovec_wrapper *iovw, char *old, char *new) {
+ size_t i;
+
+ for (i = 0; i < iovw->count; i++)
+ iovw->iovec[i].iov_base = (char*) iovw->iovec[i].iov_base - old + new;
+}
+
+size_t iovw_size(struct iovec_wrapper *iovw) {
+ size_t n = 0, i;
+
+ for (i = 0; i < iovw->count; i++)
+ n += iovw->iovec[i].iov_len;
+
+ return n;
+}
+
+void journal_importer_cleanup(JournalImporter *imp) {
+ if (imp->fd >= 0 && !imp->passive_fd) {
+ log_debug("Closing %s (fd=%d)", imp->name ?: "importer", imp->fd);
+ safe_close(imp->fd);
+ }
+
+ free(imp->name);
+ free(imp->buf);
+ iovw_free_contents(&imp->iovw);
+}
+
+static char* realloc_buffer(JournalImporter *imp, size_t size) {
+ char *b, *old = imp->buf;
+
+ b = GREEDY_REALLOC(imp->buf, imp->size, size);
+ if (!b)
+ return NULL;
+
+ iovw_rebase(&imp->iovw, old, imp->buf);
+
+ return b;
+}
+
+static int get_line(JournalImporter *imp, char **line, size_t *size) {
+ ssize_t n;
+ char *c = NULL;
+
+ assert(imp);
+ assert(imp->state == IMPORTER_STATE_LINE);
+ assert(imp->offset <= imp->filled);
+ assert(imp->filled <= imp->size);
+ assert(!imp->buf || imp->size > 0);
+ assert(imp->fd >= 0);
+
+ for (;;) {
+ if (imp->buf) {
+ size_t start = MAX(imp->scanned, imp->offset);
+
+ c = memchr(imp->buf + start, '\n',
+ imp->filled - start);
+ if (c != NULL)
+ break;
+ }
+
+ imp->scanned = imp->filled;
+ if (imp->scanned >= DATA_SIZE_MAX)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOBUFS),
+ "Entry is bigger than %u bytes.",
+ DATA_SIZE_MAX);
+
+ if (imp->passive_fd)
+ /* we have to wait for some data to come to us */
+ return -EAGAIN;
+
+ /* We know that imp->filled is at most DATA_SIZE_MAX, so if
+ we reallocate it, we'll increase the size at least a bit. */
+ assert_cc(DATA_SIZE_MAX < ENTRY_SIZE_MAX);
+ if (imp->size - imp->filled < LINE_CHUNK &&
+ !realloc_buffer(imp, MIN(imp->filled + LINE_CHUNK, ENTRY_SIZE_MAX)))
+ return log_oom();
+
+ assert(imp->buf);
+ assert(imp->size - imp->filled >= LINE_CHUNK ||
+ imp->size == ENTRY_SIZE_MAX);
+
+ n = read(imp->fd,
+ imp->buf + imp->filled,
+ imp->size - imp->filled);
+ if (n < 0) {
+ if (errno != EAGAIN)
+ log_error_errno(errno, "read(%d, ..., %zu): %m",
+ imp->fd,
+ imp->size - imp->filled);
+ return -errno;
+ } else if (n == 0)
+ return 0;
+
+ imp->filled += n;
+ }
+
+ *line = imp->buf + imp->offset;
+ *size = c + 1 - imp->buf - imp->offset;
+ imp->offset += *size;
+
+ return 1;
+}
+
+static int fill_fixed_size(JournalImporter *imp, void **data, size_t size) {
+
+ assert(imp);
+ assert(IN_SET(imp->state, IMPORTER_STATE_DATA_START, IMPORTER_STATE_DATA, IMPORTER_STATE_DATA_FINISH));
+ assert(size <= DATA_SIZE_MAX);
+ assert(imp->offset <= imp->filled);
+ assert(imp->filled <= imp->size);
+ assert(imp->buf || imp->size == 0);
+ assert(!imp->buf || imp->size > 0);
+ assert(imp->fd >= 0);
+ assert(data);
+
+ while (imp->filled - imp->offset < size) {
+ int n;
+
+ if (imp->passive_fd)
+ /* we have to wait for some data to come to us */
+ return -EAGAIN;
+
+ if (!realloc_buffer(imp, imp->offset + size))
+ return log_oom();
+
+ n = read(imp->fd, imp->buf + imp->filled,
+ imp->size - imp->filled);
+ if (n < 0) {
+ if (errno != EAGAIN)
+ log_error_errno(errno, "read(%d, ..., %zu): %m", imp->fd,
+ imp->size - imp->filled);
+ return -errno;
+ } else if (n == 0)
+ return 0;
+
+ imp->filled += n;
+ }
+
+ *data = imp->buf + imp->offset;
+ imp->offset += size;
+
+ return 1;
+}
+
+static int get_data_size(JournalImporter *imp) {
+ int r;
+ void *data;
+
+ assert(imp);
+ assert(imp->state == IMPORTER_STATE_DATA_START);
+ assert(imp->data_size == 0);
+
+ r = fill_fixed_size(imp, &data, sizeof(uint64_t));
+ if (r <= 0)
+ return r;
+
+ imp->data_size = unaligned_read_le64(data);
+ if (imp->data_size > DATA_SIZE_MAX)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Stream declares field with size %zu > DATA_SIZE_MAX = %u",
+ imp->data_size, DATA_SIZE_MAX);
+ if (imp->data_size == 0)
+ log_warning("Binary field with zero length");
+
+ return 1;
+}
+
+static int get_data_data(JournalImporter *imp, void **data) {
+ int r;
+
+ assert(imp);
+ assert(data);
+ assert(imp->state == IMPORTER_STATE_DATA);
+
+ r = fill_fixed_size(imp, data, imp->data_size);
+ if (r <= 0)
+ return r;
+
+ return 1;
+}
+
+static int get_data_newline(JournalImporter *imp) {
+ int r;
+ char *data;
+
+ assert(imp);
+ assert(imp->state == IMPORTER_STATE_DATA_FINISH);
+
+ r = fill_fixed_size(imp, (void**) &data, 1);
+ if (r <= 0)
+ return r;
+
+ assert(data);
+ if (*data != '\n') {
+ char buf[4];
+ int l;
+
+ l = cescape_char(*data, buf);
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Expected newline, got '%.*s'", l, buf);
+ }
+
+ return 1;
+}
+
+static int process_special_field(JournalImporter *imp, char *line) {
+ const char *value;
+ char buf[CELLESCAPE_DEFAULT_LENGTH];
+ int r;
+
+ assert(line);
+
+ value = startswith(line, "__CURSOR=");
+ if (value)
+ /* ignore __CURSOR */
+ return 1;
+
+ value = startswith(line, "__REALTIME_TIMESTAMP=");
+ if (value) {
+ uint64_t x;
+
+ r = safe_atou64(value, &x);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to parse __REALTIME_TIMESTAMP '%s': %m",
+ cellescape(buf, sizeof buf, value));
+ else if (!VALID_REALTIME(x)) {
+ log_warning("__REALTIME_TIMESTAMP out of range, ignoring: %"PRIu64, x);
+ return -ERANGE;
+ }
+
+ imp->ts.realtime = x;
+ return 1;
+ }
+
+ value = startswith(line, "__MONOTONIC_TIMESTAMP=");
+ if (value) {
+ uint64_t x;
+
+ r = safe_atou64(value, &x);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to parse __MONOTONIC_TIMESTAMP '%s': %m",
+ cellescape(buf, sizeof buf, value));
+ else if (!VALID_MONOTONIC(x)) {
+ log_warning("__MONOTONIC_TIMESTAMP out of range, ignoring: %"PRIu64, x);
+ return -ERANGE;
+ }
+
+ imp->ts.monotonic = x;
+ return 1;
+ }
+
+ /* Just a single underline, but it needs special treatment too. */
+ value = startswith(line, "_BOOT_ID=");
+ if (value) {
+ r = sd_id128_from_string(value, &imp->boot_id);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to parse _BOOT_ID '%s': %m",
+ cellescape(buf, sizeof buf, value));
+
+ /* store the field in the usual fashion too */
+ return 0;
+ }
+
+ value = startswith(line, "__");
+ if (value) {
+ log_notice("Unknown dunder line __%s, ignoring.", cellescape(buf, sizeof buf, value));
+ return 1;
+ }
+
+ /* no dunder */
+ return 0;
+}
+
+int journal_importer_process_data(JournalImporter *imp) {
+ int r;
+
+ switch(imp->state) {
+ case IMPORTER_STATE_LINE: {
+ char *line, *sep;
+ size_t n = 0;
+
+ assert(imp->data_size == 0);
+
+ r = get_line(imp, &line, &n);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ imp->state = IMPORTER_STATE_EOF;
+ return 0;
+ }
+ assert(n > 0);
+ assert(line[n-1] == '\n');
+
+ if (n == 1) {
+ log_trace("Received empty line, event is ready");
+ return 1;
+ }
+
+ /* MESSAGE=xxx\n
+ or
+ COREDUMP\n
+ LLLLLLLL0011223344...\n
+ */
+ sep = memchr(line, '=', n);
+ if (sep) {
+ /* chomp newline */
+ n--;
+
+ if (!journal_field_valid(line, sep - line, true)) {
+ char buf[64], *t;
+
+ t = strndupa(line, sep - line);
+ log_debug("Ignoring invalid field: \"%s\"",
+ cellescape(buf, sizeof buf, t));
+
+ return 0;
+ }
+
+ line[n] = '\0';
+ r = process_special_field(imp, line);
+ if (r != 0)
+ return r < 0 ? r : 0;
+
+ r = iovw_put(&imp->iovw, line, n);
+ if (r < 0)
+ return r;
+ } else {
+ /* replace \n with = */
+ line[n-1] = '=';
+
+ imp->field_len = n;
+ imp->state = IMPORTER_STATE_DATA_START;
+
+ /* we cannot put the field in iovec until we have all data */
+ }
+
+ log_trace("Received: %.*s (%s)", (int) n, line, sep ? "text" : "binary");
+
+ return 0; /* continue */
+ }
+
+ case IMPORTER_STATE_DATA_START:
+ assert(imp->data_size == 0);
+
+ r = get_data_size(imp);
+ // log_debug("get_data_size() -> %d", r);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ imp->state = IMPORTER_STATE_EOF;
+ return 0;
+ }
+
+ imp->state = imp->data_size > 0 ?
+ IMPORTER_STATE_DATA : IMPORTER_STATE_DATA_FINISH;
+
+ return 0; /* continue */
+
+ case IMPORTER_STATE_DATA: {
+ void *data;
+ char *field;
+
+ assert(imp->data_size > 0);
+
+ r = get_data_data(imp, &data);
+ // log_debug("get_data_data() -> %d", r);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ imp->state = IMPORTER_STATE_EOF;
+ return 0;
+ }
+
+ assert(data);
+
+ field = (char*) data - sizeof(uint64_t) - imp->field_len;
+ memmove(field + sizeof(uint64_t), field, imp->field_len);
+
+ r = iovw_put(&imp->iovw, field + sizeof(uint64_t), imp->field_len + imp->data_size);
+ if (r < 0)
+ return r;
+
+ imp->state = IMPORTER_STATE_DATA_FINISH;
+
+ return 0; /* continue */
+ }
+
+ case IMPORTER_STATE_DATA_FINISH:
+ r = get_data_newline(imp);
+ // log_debug("get_data_newline() -> %d", r);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ imp->state = IMPORTER_STATE_EOF;
+ return 0;
+ }
+
+ imp->data_size = 0;
+ imp->state = IMPORTER_STATE_LINE;
+
+ return 0; /* continue */
+ default:
+ assert_not_reached("wtf?");
+ }
+}
+
+int journal_importer_push_data(JournalImporter *imp, const char *data, size_t size) {
+ assert(imp);
+ assert(imp->state != IMPORTER_STATE_EOF);
+
+ if (!realloc_buffer(imp, imp->filled + size))
+ return log_error_errno(SYNTHETIC_ERRNO(ENOMEM),
+ "Failed to store received data of size %zu "
+ "(in addition to existing %zu bytes with %zu filled): %s",
+ size, imp->size, imp->filled,
+ strerror(ENOMEM));
+
+ memcpy(imp->buf + imp->filled, data, size);
+ imp->filled += size;
+
+ return 0;
+}
+
+void journal_importer_drop_iovw(JournalImporter *imp) {
+ size_t remain, target;
+
+ /* This function drops processed data that along with the iovw that points at it */
+
+ iovw_free_contents(&imp->iovw);
+
+ /* possibly reset buffer position */
+ remain = imp->filled - imp->offset;
+
+ if (remain == 0) /* no brainer */
+ imp->offset = imp->scanned = imp->filled = 0;
+ else if (imp->offset > imp->size - imp->filled &&
+ imp->offset > remain) {
+ memcpy(imp->buf, imp->buf + imp->offset, remain);
+ imp->offset = imp->scanned = 0;
+ imp->filled = remain;
+ }
+
+ target = imp->size;
+ while (target > 16 * LINE_CHUNK && imp->filled < target / 2)
+ target /= 2;
+ if (target < imp->size) {
+ char *tmp;
+
+ tmp = realloc(imp->buf, target);
+ if (!tmp)
+ log_warning("Failed to reallocate buffer to (smaller) size %zu",
+ target);
+ else {
+ log_debug("Reallocated buffer from %zu to %zu bytes",
+ imp->size, target);
+ imp->buf = tmp;
+ imp->size = target;
+ }
+ }
+}
+
+bool journal_importer_eof(const JournalImporter *imp) {
+ return imp->state == IMPORTER_STATE_EOF;
+}
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