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-rw-r--r--src/journal/journal-remote-parse.c415
1 files changed, 415 insertions, 0 deletions
diff --git a/src/journal/journal-remote-parse.c b/src/journal/journal-remote-parse.c
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index 0000000000..ee2260c5a9
--- /dev/null
+++ b/src/journal/journal-remote-parse.c
@@ -0,0 +1,415 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 "journal-remote-parse.h"
+#include "journald-native.h"
+
+#define LINE_CHUNK 1024u
+
+void source_free(RemoteSource *source) {
+ if (!source)
+ return;
+
+ if (source->fd >= 0) {
+ log_debug("Closing fd:%d (%s)", source->fd, source->name);
+ close(source->fd);
+ }
+ free(source->name);
+ free(source->buf);
+ iovw_free_contents(&source->iovw);
+ free(source);
+}
+
+static int get_line(RemoteSource *source, char **line, size_t *size) {
+ ssize_t n, remain;
+ char *c;
+ char *newbuf = NULL;
+ size_t newsize = 0;
+
+ assert(source);
+ assert(source->state == STATE_LINE);
+ assert(source->filled <= source->size);
+ assert(source->buf == NULL || source->size > 0);
+
+ c = memchr(source->buf, '\n', source->filled);
+ if (c != NULL)
+ goto docopy;
+
+ resize:
+ if (source->size - source->filled < LINE_CHUNK) {
+ // XXX: add check for maximum line length
+
+ if (!GREEDY_REALLOC(source->buf, source->size,
+ source->filled + LINE_CHUNK))
+ return log_oom();
+ }
+ assert(source->size - source->filled >= LINE_CHUNK);
+
+ n = read(source->fd, source->buf + source->filled,
+ source->size - source->filled);
+ if (n < 0) {
+ if (errno != EAGAIN && errno != EWOULDBLOCK)
+ log_error("read(%d, ..., %zd): %m", source->fd,
+ source->size - source->filled);
+ return -errno;
+ } else if (n == 0)
+ return 0;
+
+ c = memchr(source->buf + source->filled, '\n', n);
+ source->filled += n;
+
+ if (c == NULL)
+ goto resize;
+
+ docopy:
+ *line = source->buf;
+ *size = c + 1 - source->buf;
+
+ /* Check if something remains */
+ remain = source->buf + source->filled - c - 1;
+ assert(remain >= 0);
+ if (remain) {
+ newsize = MAX(remain, LINE_CHUNK);
+ newbuf = malloc(newsize);
+ if (!newbuf)
+ return log_oom();
+ memcpy(newbuf, c + 1, remain);
+ }
+ source->buf = newbuf;
+ source->size = newsize;
+ source->filled = remain;
+
+ return 1;
+}
+
+static int fill_fixed_size(RemoteSource *source, void **data, size_t size) {
+ int n;
+ char *newbuf = NULL;
+ size_t newsize = 0, remain;
+
+ assert(source);
+ assert(source->state == STATE_DATA_START ||
+ source->state == STATE_DATA ||
+ source->state == STATE_DATA_FINISH);
+ assert(size <= DATA_SIZE_MAX);
+ assert(source->filled <= source->size);
+ assert(source->buf != NULL || source->size == 0);
+ assert(source->buf == NULL || source->size > 0);
+ assert(data);
+
+ while(source->filled < size) {
+ if (!GREEDY_REALLOC(source->buf, source->size, size))
+ return log_oom();
+
+ n = read(source->fd, source->buf + source->filled,
+ source->size - source->filled);
+ if (n < 0) {
+ if (errno != EAGAIN && errno != EWOULDBLOCK)
+ log_error("read(%d, ..., %zd): %m", source->fd,
+ source->size - source->filled);
+ return -errno;
+ } else if (n == 0)
+ return 0;
+
+ source->filled += n;
+ }
+
+ *data = source->buf;
+
+ /* Check if something remains */
+ assert(size <= source->filled);
+ remain = source->filled - size;
+ if (remain) {
+ newsize = MAX(remain, LINE_CHUNK);
+ newbuf = malloc(newsize);
+ if (!newbuf)
+ return log_oom();
+ memcpy(newbuf, source->buf + size, remain);
+ }
+ source->buf = newbuf;
+ source->size = newsize;
+ source->filled = remain;
+
+ return 1;
+}
+
+static int get_data_size(RemoteSource *source) {
+ int r;
+ void _cleanup_free_ *data = NULL;
+
+ assert(source);
+ assert(source->state == STATE_DATA_START);
+ assert(source->data_size == 0);
+
+ r = fill_fixed_size(source, &data, sizeof(uint64_t));
+ if (r <= 0)
+ return r;
+
+ source->data_size = le64toh( *(uint64_t *) data );
+ if (source->data_size > DATA_SIZE_MAX) {
+ log_error("Stream declares field with size %zu > %u == DATA_SIZE_MAX",
+ source->data_size, DATA_SIZE_MAX);
+ return -EINVAL;
+ }
+ if (source->data_size == 0)
+ log_warning("Binary field with zero length");
+
+ return 1;
+}
+
+static int get_data_data(RemoteSource *source, void **data) {
+ int r;
+
+ assert(source);
+ assert(data);
+ assert(source->state == STATE_DATA);
+
+ r = fill_fixed_size(source, data, source->data_size);
+ if (r <= 0)
+ return r;
+
+ return 1;
+}
+
+static int get_data_newline(RemoteSource *source) {
+ int r;
+ char _cleanup_free_ *data = NULL;
+
+ assert(source);
+ assert(source->state == STATE_DATA_FINISH);
+
+ r = fill_fixed_size(source, (void**) &data, 1);
+ if (r <= 0)
+ return r;
+
+ assert(data);
+ if (*data != '\n') {
+ log_error("expected newline, got '%c'", *data);
+ return -EINVAL;
+ }
+
+ return 1;
+}
+
+static int process_dunder(RemoteSource *source, char *line, size_t n) {
+ const char *timestamp;
+ int r;
+
+ assert(line);
+ assert(n > 0);
+ assert(line[n-1] == '\n');
+
+ /* XXX: is it worth to support timestamps in extended format?
+ * We don't produce them, but who knows... */
+
+ timestamp = startswith(line, "__CURSOR=");
+ if (timestamp)
+ /* ignore __CURSOR */
+ return 1;
+
+ timestamp = startswith(line, "__REALTIME_TIMESTAMP=");
+ if (timestamp) {
+ long long unsigned x;
+ line[n-1] = '\0';
+ r = safe_atollu(timestamp, &x);
+ if (r < 0)
+ log_warning("Failed to parse __REALTIME_TIMESTAMP: '%s'", timestamp);
+ else
+ source->ts.realtime = x;
+ return r < 0 ? r : 1;
+ }
+
+ timestamp = startswith(line, "__MONOTONIC_TIMESTAMP=");
+ if (timestamp) {
+ long long unsigned x;
+ line[n-1] = '\0';
+ r = safe_atollu(timestamp, &x);
+ if (r < 0)
+ log_warning("Failed to parse __MONOTONIC_TIMESTAMP: '%s'", timestamp);
+ else
+ source->ts.monotonic = x;
+ return r < 0 ? r : 1;
+ }
+
+ timestamp = startswith(line, "__");
+ if (timestamp) {
+ log_notice("Unknown dunder line %s", line);
+ return 1;
+ }
+
+ /* no dunder */
+ return 0;
+}
+
+int process_data(RemoteSource *source) {
+ int r;
+
+ switch(source->state) {
+ case STATE_LINE: {
+ char *line, *sep;
+ size_t n;
+
+ assert(source->data_size == 0);
+
+ r = get_line(source, &line, &n);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ source->state = STATE_EOF;
+ return r;
+ }
+ assert(n > 0);
+ assert(line[n-1] == '\n');
+
+ if (n == 1) {
+ log_debug("Received empty line, event is ready");
+ free(line);
+ return 1;
+ }
+
+ r = process_dunder(source, line, n);
+ if (r != 0) {
+ free(line);
+ return r < 0 ? r : 0;
+ }
+
+ /* MESSAGE=xxx\n
+ or
+ COREDUMP\n
+ LLLLLLLL0011223344...\n
+ */
+ sep = memchr(line, '=', n);
+ if (sep)
+ /* chomp newline */
+ n--;
+ else
+ /* replace \n with = */
+ line[n-1] = '=';
+ log_debug("Received: %.*s", (int) n, line);
+
+ r = iovw_put(&source->iovw, line, n);
+ if (r < 0) {
+ log_error("Failed to put line in iovect");
+ free(line);
+ return r;
+ }
+
+ if (!sep)
+ source->state = STATE_DATA_START;
+ return 0; /* continue */
+ }
+
+ case STATE_DATA_START:
+ assert(source->data_size == 0);
+
+ r = get_data_size(source);
+ log_debug("get_data_size() -> %d", r);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ source->state = STATE_EOF;
+ return 0;
+ }
+
+ source->state = source->data_size > 0 ?
+ STATE_DATA : STATE_DATA_FINISH;
+
+ return 0; /* continue */
+
+ case STATE_DATA: {
+ void *data;
+
+ assert(source->data_size > 0);
+
+ r = get_data_data(source, &data);
+ log_debug("get_data_data() -> %d", r);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ source->state = STATE_EOF;
+ return 0;
+ }
+
+ assert(data);
+
+ r = iovw_put(&source->iovw, data, source->data_size);
+ if (r < 0) {
+ log_error("failed to put binary buffer in iovect");
+ return r;
+ }
+
+ source->state = STATE_DATA_FINISH;
+
+ return 0; /* continue */
+ }
+
+ case STATE_DATA_FINISH:
+ r = get_data_newline(source);
+ log_debug("get_data_newline() -> %d", r);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ source->state = STATE_EOF;
+ return 0;
+ }
+
+ source->data_size = 0;
+ source->state = STATE_LINE;
+
+ return 0; /* continue */
+ default:
+ assert_not_reached("wtf?");
+ }
+}
+
+int process_source(RemoteSource *source, Writer *writer, bool compress, bool seal) {
+ int r;
+
+ assert(source);
+ assert(writer);
+
+ r = process_data(source);
+ if (r <= 0)
+ return r;
+
+ /* We have a full event */
+ log_info("Received a full event from source@%p fd:%d (%s)",
+ source, source->fd, source->name);
+
+ if (!source->iovw.count) {
+ log_warning("Entry with no payload, skipping");
+ goto freeing;
+ }
+
+ assert(source->iovw.iovec);
+ assert(source->iovw.count);
+
+ r = writer_write(writer, &source->iovw, &source->ts, compress, seal);
+ if (r < 0)
+ log_error("Failed to write entry of %zu bytes: %s",
+ iovw_size(&source->iovw), strerror(-r));
+ else
+ r = 1;
+
+ freeing:
+ iovw_free_contents(&source->iovw);
+ return r;
+}
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