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Diffstat (limited to 'src/grp-journal/grp-remote/systemd-journal-upload/journal-upload-journal.c')
-rw-r--r--src/grp-journal/grp-remote/systemd-journal-upload/journal-upload-journal.c422
1 files changed, 422 insertions, 0 deletions
diff --git a/src/grp-journal/grp-remote/systemd-journal-upload/journal-upload-journal.c b/src/grp-journal/grp-remote/systemd-journal-upload/journal-upload-journal.c
new file mode 100644
index 0000000000..aef095c8c9
--- /dev/null
+++ b/src/grp-journal/grp-remote/systemd-journal-upload/journal-upload-journal.c
@@ -0,0 +1,422 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Zbigniew Jędrzejewski-Szmek
+
+ 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 <curl/curl.h>
+#include <stdbool.h>
+
+#include "alloc-util.h"
+#include "journal-upload.h"
+#include "log.h"
+#include "utf8.h"
+#include "util.h"
+#include <systemd/sd-daemon.h>
+
+/**
+ * Write up to size bytes to buf. Return negative on error, and number of
+ * bytes written otherwise. The last case is a kind of an error too.
+ */
+static ssize_t write_entry(char *buf, size_t size, Uploader *u) {
+ int r;
+ size_t pos = 0;
+
+ assert(size <= SSIZE_MAX);
+
+ for (;;) {
+
+ switch(u->entry_state) {
+ case ENTRY_CURSOR: {
+ u->current_cursor = mfree(u->current_cursor);
+
+ r = sd_journal_get_cursor(u->journal, &u->current_cursor);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get cursor: %m");
+
+ r = snprintf(buf + pos, size - pos,
+ "__CURSOR=%s\n", u->current_cursor);
+ if (pos + r > size)
+ /* not enough space */
+ return pos;
+
+ u->entry_state++;
+
+ if (pos + r == size) {
+ /* exactly one character short, but we don't need it */
+ buf[size - 1] = '\n';
+ return size;
+ }
+
+ pos += r;
+ } /* fall through */
+
+ case ENTRY_REALTIME: {
+ usec_t realtime;
+
+ r = sd_journal_get_realtime_usec(u->journal, &realtime);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get realtime timestamp: %m");
+
+ r = snprintf(buf + pos, size - pos,
+ "__REALTIME_TIMESTAMP="USEC_FMT"\n", realtime);
+ if (r + pos > size)
+ /* not enough space */
+ return pos;
+
+ u->entry_state++;
+
+ if (r + pos == size) {
+ /* exactly one character short, but we don't need it */
+ buf[size - 1] = '\n';
+ return size;
+ }
+
+ pos += r;
+ } /* fall through */
+
+ case ENTRY_MONOTONIC: {
+ usec_t monotonic;
+ sd_id128_t boot_id;
+
+ r = sd_journal_get_monotonic_usec(u->journal, &monotonic, &boot_id);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get monotonic timestamp: %m");
+
+ r = snprintf(buf + pos, size - pos,
+ "__MONOTONIC_TIMESTAMP="USEC_FMT"\n", monotonic);
+ if (r + pos > size)
+ /* not enough space */
+ return pos;
+
+ u->entry_state++;
+
+ if (r + pos == size) {
+ /* exactly one character short, but we don't need it */
+ buf[size - 1] = '\n';
+ return size;
+ }
+
+ pos += r;
+ } /* fall through */
+
+ case ENTRY_BOOT_ID: {
+ sd_id128_t boot_id;
+ char sid[33];
+
+ r = sd_journal_get_monotonic_usec(u->journal, NULL, &boot_id);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get monotonic timestamp: %m");
+
+ r = snprintf(buf + pos, size - pos,
+ "_BOOT_ID=%s\n", sd_id128_to_string(boot_id, sid));
+ if (r + pos > size)
+ /* not enough space */
+ return pos;
+
+ u->entry_state++;
+
+ if (r + pos == size) {
+ /* exactly one character short, but we don't need it */
+ buf[size - 1] = '\n';
+ return size;
+ }
+
+ pos += r;
+ } /* fall through */
+
+ case ENTRY_NEW_FIELD: {
+ u->field_pos = 0;
+
+ r = sd_journal_enumerate_data(u->journal,
+ &u->field_data,
+ &u->field_length);
+ if (r < 0)
+ return log_error_errno(r, "Failed to move to next field in entry: %m");
+ else if (r == 0) {
+ u->entry_state = ENTRY_OUTRO;
+ continue;
+ }
+
+ if (!utf8_is_printable_newline(u->field_data,
+ u->field_length, false)) {
+ u->entry_state = ENTRY_BINARY_FIELD_START;
+ continue;
+ }
+
+ u->entry_state++;
+ } /* fall through */
+
+ case ENTRY_TEXT_FIELD:
+ case ENTRY_BINARY_FIELD: {
+ bool done;
+ size_t tocopy;
+
+ done = size - pos > u->field_length - u->field_pos;
+ if (done)
+ tocopy = u->field_length - u->field_pos;
+ else
+ tocopy = size - pos;
+
+ memcpy(buf + pos,
+ (char*) u->field_data + u->field_pos,
+ tocopy);
+
+ if (done) {
+ buf[pos + tocopy] = '\n';
+ pos += tocopy + 1;
+ u->entry_state = ENTRY_NEW_FIELD;
+ continue;
+ } else {
+ u->field_pos += tocopy;
+ return size;
+ }
+ }
+
+ case ENTRY_BINARY_FIELD_START: {
+ const char *c;
+ size_t len;
+
+ c = memchr(u->field_data, '=', u->field_length);
+ if (!c || c == u->field_data) {
+ log_error("Invalid field.");
+ return -EINVAL;
+ }
+
+ len = c - (const char*)u->field_data;
+
+ /* need space for label + '\n' */
+ if (size - pos < len + 1)
+ return pos;
+
+ memcpy(buf + pos, u->field_data, len);
+ buf[pos + len] = '\n';
+ pos += len + 1;
+
+ u->field_pos = len + 1;
+ u->entry_state++;
+ } /* fall through */
+
+ case ENTRY_BINARY_FIELD_SIZE: {
+ uint64_t le64;
+
+ /* need space for uint64_t */
+ if (size - pos < 8)
+ return pos;
+
+ le64 = htole64(u->field_length - u->field_pos);
+ memcpy(buf + pos, &le64, 8);
+ pos += 8;
+
+ u->entry_state++;
+ continue;
+ }
+
+ case ENTRY_OUTRO:
+ /* need space for '\n' */
+ if (size - pos < 1)
+ return pos;
+
+ buf[pos++] = '\n';
+ u->entry_state++;
+ u->entries_sent++;
+
+ return pos;
+
+ default:
+ assert_not_reached("WTF?");
+ }
+ }
+ assert_not_reached("WTF?");
+}
+
+static inline void check_update_watchdog(Uploader *u) {
+ usec_t after;
+ usec_t elapsed_time;
+
+ if (u->watchdog_usec <= 0)
+ return;
+
+ after = now(CLOCK_MONOTONIC);
+ elapsed_time = usec_sub(after, u->watchdog_timestamp);
+ if (elapsed_time > u->watchdog_usec / 2) {
+ log_debug("Update watchdog timer");
+ sd_notify(false, "WATCHDOG=1");
+ u->watchdog_timestamp = after;
+ }
+}
+
+static size_t journal_input_callback(void *buf, size_t size, size_t nmemb, void *userp) {
+ Uploader *u = userp;
+ int r;
+ sd_journal *j;
+ size_t filled = 0;
+ ssize_t w;
+
+ assert(u);
+ assert(nmemb <= SSIZE_MAX / size);
+
+ check_update_watchdog(u);
+
+ j = u->journal;
+
+ while (j && filled < size * nmemb) {
+ if (u->entry_state == ENTRY_DONE) {
+ r = sd_journal_next(j);
+ if (r < 0) {
+ log_error_errno(r, "Failed to move to next entry in journal: %m");
+ return CURL_READFUNC_ABORT;
+ } else if (r == 0) {
+ if (u->input_event)
+ log_debug("No more entries, waiting for journal.");
+ else {
+ log_info("No more entries, closing journal.");
+ close_journal_input(u);
+ }
+
+ u->uploading = false;
+
+ break;
+ }
+
+ u->entry_state = ENTRY_CURSOR;
+ }
+
+ w = write_entry((char*)buf + filled, size * nmemb - filled, u);
+ if (w < 0)
+ return CURL_READFUNC_ABORT;
+ filled += w;
+
+ if (filled == 0) {
+ log_error("Buffer space is too small to write entry.");
+ return CURL_READFUNC_ABORT;
+ } else if (u->entry_state != ENTRY_DONE)
+ /* This means that all available space was used up */
+ break;
+
+ log_debug("Entry %zu (%s) has been uploaded.",
+ u->entries_sent, u->current_cursor);
+ }
+
+ return filled;
+}
+
+void close_journal_input(Uploader *u) {
+ assert(u);
+
+ if (u->journal) {
+ log_debug("Closing journal input.");
+
+ sd_journal_close(u->journal);
+ u->journal = NULL;
+ }
+ u->timeout = 0;
+}
+
+static int process_journal_input(Uploader *u, int skip) {
+ int r;
+
+ if (u->uploading)
+ return 0;
+
+ r = sd_journal_next_skip(u->journal, skip);
+ if (r < 0)
+ return log_error_errno(r, "Failed to skip to next entry: %m");
+ else if (r < skip)
+ return 0;
+
+ /* have data */
+ u->entry_state = ENTRY_CURSOR;
+ return start_upload(u, journal_input_callback, u);
+}
+
+int check_journal_input(Uploader *u) {
+ if (u->input_event) {
+ int r;
+
+ r = sd_journal_process(u->journal);
+ if (r < 0) {
+ log_error_errno(r, "Failed to process journal: %m");
+ close_journal_input(u);
+ return r;
+ }
+
+ if (r == SD_JOURNAL_NOP)
+ return 0;
+ }
+
+ return process_journal_input(u, 1);
+}
+
+static int dispatch_journal_input(sd_event_source *event,
+ int fd,
+ uint32_t revents,
+ void *userp) {
+ Uploader *u = userp;
+
+ assert(u);
+
+ if (u->uploading)
+ return 0;
+
+ log_debug("Detected journal input, checking for new data.");
+ return check_journal_input(u);
+}
+
+int open_journal_for_upload(Uploader *u,
+ sd_journal *j,
+ const char *cursor,
+ bool after_cursor,
+ bool follow) {
+ int fd, r, events;
+
+ u->journal = j;
+
+ sd_journal_set_data_threshold(j, 0);
+
+ if (follow) {
+ fd = sd_journal_get_fd(j);
+ if (fd < 0)
+ return log_error_errno(fd, "sd_journal_get_fd failed: %m");
+
+ events = sd_journal_get_events(j);
+
+ r = sd_journal_reliable_fd(j);
+ assert(r >= 0);
+ if (r > 0)
+ u->timeout = -1;
+ else
+ u->timeout = JOURNAL_UPLOAD_POLL_TIMEOUT;
+
+ r = sd_event_add_io(u->events, &u->input_event,
+ fd, events, dispatch_journal_input, u);
+ if (r < 0)
+ return log_error_errno(r, "Failed to register input event: %m");
+
+ log_debug("Listening for journal events on fd:%d, timeout %d",
+ fd, u->timeout == (uint64_t) -1 ? -1 : (int) u->timeout);
+ } else
+ log_debug("Not listening for journal events.");
+
+ if (cursor) {
+ r = sd_journal_seek_cursor(j, cursor);
+ if (r < 0)
+ return log_error_errno(r, "Failed to seek to cursor %s: %m",
+ cursor);
+ }
+
+ return process_journal_input(u, 1 + !!after_cursor);
+}
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