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Merge pull request #9346 from keszybz/journald-exact2

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Store a copy of the input message if any stripping or truncation occurs
This commit is contained in:
Lennart Poettering 2018-07-18 21:00:43 +02:00 committed by GitHub
commit 8d568e8d3e
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3 changed files with 101 additions and 42 deletions
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30
man/systemd.journal-fields.xml
View File

@ -103,16 +103,34 @@
<term><varname>SYSLOG_FACILITY=</varname></term>
<term><varname>SYSLOG_IDENTIFIER=</varname></term>
<term><varname>SYSLOG_PID=</varname></term>
<term><varname>SYSLOG_TIMESTAMP=</varname></term>
<listitem>
<para>Syslog compatibility fields containing the facility
(formatted as decimal string), the identifier string (i.e.
"tag"), and the client PID. (Note that the tag is usually
derived from glibc's
<varname>program_invocation_short_name</varname> variable,
see
<para>Syslog compatibility fields containing the facility (formatted as
decimal string), the identifier string (i.e. "tag"), the client PID, and
the timestamp as specified in the original datagram. (Note that the tag is
usually derived from glibc's
<varname>program_invocation_short_name</varname> variable, see
<citerefentry project='die-net'><refentrytitle>program_invocation_short_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>.)</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>SYSLOG_RAW=</varname></term>
<listitem>
<para>The original contents of the syslog line as received in the syslog
datagram. This field is only included if the <varname>MESSAGE=</varname>
field was modified compared to the original payload or the timestamp could
not be located properly and is not included in
<varname>SYSLOG_TIMESTAMP=</varname>. Message truncation occurs when when
the message contains leading or trailing whitespace (trailing and leading
whitespace is stripped), or it contains an embedded
<constant>NUL</constant> byte (the <constant>NUL</constant> byte and
anything after it is not included). Thus, the original syslog line is
either stored as <varname>SYSLOG_RAW=</varname> or it can be recreated
based on the stored priority and facility, timestamp, identifier, and the
message payload in <varname>MESSAGE=</varname>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>

110
src/journal/journald-syslog.c
View File

@ -224,7 +224,7 @@ size_t syslog_parse_identifier(const char **buf, char **identifier, char **pid)
return e;
}
static void syslog_skip_date(char **buf) {
static int syslog_skip_timestamp(const char **buf) {
enum {
LETTER,
SPACE,
@ -244,24 +244,21 @@ static void syslog_skip_date(char **buf) {
SPACE
};
char *p;
const char *p, *t;
unsigned i;
assert(buf);
assert(*buf);
p = *buf;
for (i = 0; i < ELEMENTSOF(sequence); i++, p++) {
for (i = 0, p = *buf; i < ELEMENTSOF(sequence); i++, p++) {
if (!*p)
return;
return 0;
switch (sequence[i]) {
case SPACE:
if (*p != ' ')
return;
return 0;
break;
case SPACE_OR_NUMBER:
@ -271,48 +268,56 @@ static void syslog_skip_date(char **buf) {
_fallthrough_;
case NUMBER:
if (*p < '0' || *p > '9')
return;
return 0;
break;
case LETTER:
if (!(*p >= 'A' && *p <= 'Z') &&
!(*p >= 'a' && *p <= 'z'))
return;
return 0;
break;
case COLON:
if (*p != ':')
return;
return 0;
break;
}
}
t = *buf;
*buf = p;
return p - t;
}
void server_process_syslog_message(
Server *s,
const char *buf,
size_t buf_len,
size_t raw_len,
const struct ucred *ucred,
const struct timeval *tv,
const char *label,
size_t label_len) {
char syslog_priority[sizeof("PRIORITY=") + DECIMAL_STR_MAX(int)],
syslog_facility[sizeof("SYSLOG_FACILITY=") + DECIMAL_STR_MAX(int)], *msg;
const char *message = NULL, *syslog_identifier = NULL, *syslog_pid = NULL;
char *t, syslog_priority[sizeof("PRIORITY=") + DECIMAL_STR_MAX(int)],
syslog_facility[sizeof("SYSLOG_FACILITY=") + DECIMAL_STR_MAX(int)];
const char *msg, *syslog_ts, *a;
_cleanup_free_ char *identifier = NULL, *pid = NULL;
int priority = LOG_USER | LOG_INFO, r;
ClientContext *context = NULL;
struct iovec *iovec;
size_t n = 0, m, i;
size_t n = 0, m, i, leading_ws, syslog_ts_len;
bool store_raw;
assert(s);
assert(buf);
/* The message cannot be empty. */
assert(raw_len > 0);
/* The buffer NUL-terminated and can be used a string. raw_len is the length
* without the terminating NUL byte, the buffer is actually one bigger. */
assert(buf[raw_len] == '\0');
if (ucred && pid_is_valid(ucred->pid)) {
r = client_context_get(s, ucred->pid, ucred, label, label_len, NULL, &context);
@ -320,26 +325,42 @@ void server_process_syslog_message(
log_warning_errno(r, "Failed to retrieve credentials for PID " PID_FMT ", ignoring: %m", ucred->pid);
}
/* We are creating copy of the message because we want to forward original message verbatim to the legacy
syslog implementation */
for (i = buf_len; i > 0; i--)
/* We are creating a copy of the message because we want to forward the original message
verbatim to the legacy syslog implementation */
for (i = raw_len; i > 0; i--)
if (!strchr(WHITESPACE, buf[i-1]))
break;
msg = newa(char, i + 1);
*((char *) mempcpy(msg, buf, i)) = 0;
msg = skip_leading_chars(msg, WHITESPACE);
leading_ws = strspn(buf, WHITESPACE);
syslog_parse_priority((const char **)&msg, &priority, true);
if (i == raw_len)
/* Nice! No need to strip anything on the end, let's optimize this a bit */
msg = buf + leading_ws;
else {
msg = t = newa(char, i - leading_ws + 1);
memcpy(t, buf + leading_ws, i - leading_ws);
t[i - leading_ws] = 0;
}
/* We will add the SYSLOG_RAW= field when we stripped anything
* _or_ if the input message contained NUL bytes. */
store_raw = msg != buf || strlen(msg) != raw_len;
syslog_parse_priority(&msg, &priority, true);
if (!client_context_test_priority(context, priority))
return;
if (s->forward_to_syslog)
forward_syslog_raw(s, priority, buf, buf_len, ucred, tv);
syslog_ts = msg;
syslog_ts_len = syslog_skip_timestamp(&msg);
if (syslog_ts_len == 0)
/* We failed to parse the full timestamp, store the raw message too */
store_raw = true;
syslog_skip_date(&msg);
syslog_parse_identifier((const char**)&msg, &identifier, &pid);
syslog_parse_identifier(&msg, &identifier, &pid);
if (s->forward_to_syslog)
forward_syslog_raw(s, priority, buf, raw_len, ucred, tv);
if (s->forward_to_kmsg)
server_forward_kmsg(s, priority, identifier, msg, ucred);
@ -350,7 +371,7 @@ void server_process_syslog_message(
if (s->forward_to_wall)
server_forward_wall(s, priority, identifier, msg, ucred);
m = N_IOVEC_META_FIELDS + 6 + client_context_extra_fields_n_iovec(context);
m = N_IOVEC_META_FIELDS + 8 + client_context_extra_fields_n_iovec(context);
iovec = newa(struct iovec, m);
iovec[n++] = IOVEC_MAKE_STRING("_TRANSPORT=syslog");
@ -364,18 +385,37 @@ void server_process_syslog_message(
}
if (identifier) {
syslog_identifier = strjoina("SYSLOG_IDENTIFIER=", identifier);
iovec[n++] = IOVEC_MAKE_STRING(syslog_identifier);
a = strjoina("SYSLOG_IDENTIFIER=", identifier);
iovec[n++] = IOVEC_MAKE_STRING(a);
}
if (pid) {
syslog_pid = strjoina("SYSLOG_PID=", pid);
iovec[n++] = IOVEC_MAKE_STRING(syslog_pid);
a = strjoina("SYSLOG_PID=", pid);
iovec[n++] = IOVEC_MAKE_STRING(a);
}
message = strjoina("MESSAGE=", msg);
if (message)
iovec[n++] = IOVEC_MAKE_STRING(message);
if (syslog_ts_len > 0) {
const size_t hlen = strlen("SYSLOG_TIMESTAMP=");
t = newa(char, hlen + raw_len);
memcpy(t, "SYSLOG_TIMESTAMP=", hlen);
memcpy(t + hlen, syslog_ts, syslog_ts_len);
iovec[n++] = IOVEC_MAKE(t, hlen + syslog_ts_len);
}
a = strjoina("MESSAGE=", msg);
iovec[n++] = IOVEC_MAKE_STRING(a);
if (store_raw) {
const size_t hlen = strlen("SYSLOG_RAW=");
t = newa(char, hlen + raw_len);
memcpy(t, "SYSLOG_RAW=", hlen);
memcpy(t + hlen, buf, raw_len);
iovec[n++] = IOVEC_MAKE(t, hlen + raw_len);
}
server_dispatch_message(s, iovec, n, m, context, tv, priority, 0);
}

3
src/systemctl/systemctl.c
View File

@ -7838,7 +7838,8 @@ static int parse_shutdown_time_spec(const char *t, usec_t *_u) {
tm.tm_min = (int) minute;
tm.tm_sec = 0;
assert_se(s = mktime(&tm));
s = mktime(&tm);
assert(s >= 0);
*_u = (usec_t) s * USEC_PER_SEC;