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Systemd/src/journal/journal-gatewayd.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
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 <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <microhttpd.h>
#include "log.h"
#include "util.h"
#include "sd-journal.h"
#include "sd-daemon.h"
#include "logs-show.h"
#include "virt.h"
typedef struct RequestMeta {
sd_journal *journal;
OutputMode mode;
char *cursor;
int64_t n_skip;
uint64_t n_entries;
bool n_entries_set;
FILE *tmp;
uint64_t delta, size;
int argument_parse_error;
bool follow;
bool discrete;
uint64_t n_fields;
bool n_fields_set;
} RequestMeta;
static const char* const mime_types[_OUTPUT_MODE_MAX] = {
[OUTPUT_SHORT] = "text/plain",
[OUTPUT_JSON] = "application/json",
[OUTPUT_JSON_SSE] = "text/event-stream",
[OUTPUT_EXPORT] = "application/vnd.fdo.journal",
};
static RequestMeta *request_meta(void **connection_cls) {
RequestMeta *m;
if (*connection_cls)
return *connection_cls;
m = new0(RequestMeta, 1);
if (!m)
return NULL;
*connection_cls = m;
return m;
}
static void request_meta_free(
void *cls,
struct MHD_Connection *connection,
void **connection_cls,
enum MHD_RequestTerminationCode toe) {
RequestMeta *m = *connection_cls;
if (!m)
return;
if (m->journal)
sd_journal_close(m->journal);
if (m->tmp)
fclose(m->tmp);
free(m->cursor);
free(m);
}
static int open_journal(RequestMeta *m) {
assert(m);
if (m->journal)
return 0;
return sd_journal_open(&m->journal, SD_JOURNAL_LOCAL_ONLY|SD_JOURNAL_SYSTEM_ONLY);
}
static int respond_oom(struct MHD_Connection *connection) {
struct MHD_Response *response;
const char m[] = "Out of memory.\n";
int ret;
assert(connection);
response = MHD_create_response_from_buffer(sizeof(m)-1, (char*) m, MHD_RESPMEM_PERSISTENT);
if (!response)
return MHD_NO;
MHD_add_response_header(response, "Content-Type", "text/plain");
ret = MHD_queue_response(connection, MHD_HTTP_SERVICE_UNAVAILABLE, response);
MHD_destroy_response(response);
return ret;
}
static int respond_error(
struct MHD_Connection *connection,
unsigned code,
const char *format, ...) {
struct MHD_Response *response;
char *m;
int r;
va_list ap;
assert(connection);
assert(format);
va_start(ap, format);
r = vasprintf(&m, format, ap);
va_end(ap);
if (r < 0)
return respond_oom(connection);
response = MHD_create_response_from_buffer(strlen(m), m, MHD_RESPMEM_MUST_FREE);
if (!response) {
free(m);
return respond_oom(connection);
}
MHD_add_response_header(response, "Content-Type", "text/plain");
r = MHD_queue_response(connection, code, response);
MHD_destroy_response(response);
return r;
}
static ssize_t request_reader_entries(
void *cls,
uint64_t pos,
char *buf,
size_t max) {
RequestMeta *m = cls;
int r;
size_t n, k;
assert(m);
assert(buf);
assert(max > 0);
assert(pos >= m->delta);
pos -= m->delta;
while (pos >= m->size) {
off_t sz;
/* End of this entry, so let's serialize the next
* one */
if (m->n_entries_set &&
m->n_entries <= 0)
return MHD_CONTENT_READER_END_OF_STREAM;
if (m->n_skip < 0)
r = sd_journal_previous_skip(m->journal, (uint64_t) -m->n_skip + 1);
else if (m->n_skip > 0)
r = sd_journal_next_skip(m->journal, (uint64_t) m->n_skip + 1);
else
r = sd_journal_next(m->journal);
if (r < 0) {
log_error("Failed to advance journal pointer: %s", strerror(-r));
return MHD_CONTENT_READER_END_WITH_ERROR;
} else if (r == 0) {
if (m->follow) {
r = sd_journal_wait(m->journal, (uint64_t) -1);
if (r < 0) {
log_error("Couldn't wait for journal event: %s", strerror(-r));
return MHD_CONTENT_READER_END_WITH_ERROR;
}
continue;
}
return MHD_CONTENT_READER_END_OF_STREAM;
}
if (m->discrete) {
assert(m->cursor);
r = sd_journal_test_cursor(m->journal, m->cursor);
if (r < 0) {
log_error("Failed to test cursor: %s", strerror(-r));
return MHD_CONTENT_READER_END_WITH_ERROR;
}
if (r == 0)
return MHD_CONTENT_READER_END_OF_STREAM;
}
pos -= m->size;
m->delta += m->size;
if (m->n_entries_set)
m->n_entries -= 1;
m->n_skip = 0;
if (m->tmp)
rewind(m->tmp);
else {
m->tmp = tmpfile();
if (!m->tmp) {
log_error("Failed to create temporary file: %m");
return MHD_CONTENT_READER_END_WITH_ERROR;
}
}
r = output_journal(m->tmp, m->journal, m->mode, 0, OUTPUT_FULL_WIDTH);
if (r < 0) {
log_error("Failed to serialize item: %s", strerror(-r));
return MHD_CONTENT_READER_END_WITH_ERROR;
}
sz = ftello(m->tmp);
if (sz == (off_t) -1) {
log_error("Failed to retrieve file position: %m");
return MHD_CONTENT_READER_END_WITH_ERROR;
}
m->size = (uint64_t) sz;
}
if (fseeko(m->tmp, pos, SEEK_SET) < 0) {
log_error("Failed to seek to position: %m");
return MHD_CONTENT_READER_END_WITH_ERROR;
}
n = m->size - pos;
if (n > max)
n = max;
errno = 0;
k = fread(buf, 1, n, m->tmp);
if (k != n) {
log_error("Failed to read from file: %s", errno ? strerror(errno) : "Premature EOF");
return MHD_CONTENT_READER_END_WITH_ERROR;
}
return (ssize_t) k;
}
static int request_parse_accept(
RequestMeta *m,
struct MHD_Connection *connection) {
const char *header;
assert(m);
assert(connection);
header = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, "Accept");
if (!header)
return 0;
if (streq(header, mime_types[OUTPUT_JSON]))
m->mode = OUTPUT_JSON;
else if (streq(header, mime_types[OUTPUT_JSON_SSE]))
m->mode = OUTPUT_JSON_SSE;
else if (streq(header, mime_types[OUTPUT_EXPORT]))
m->mode = OUTPUT_EXPORT;
else
m->mode = OUTPUT_SHORT;
return 0;
}
static int request_parse_range(
RequestMeta *m,
struct MHD_Connection *connection) {
const char *range, *colon, *colon2;
int r;
assert(m);
assert(connection);
range = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, "Range");
if (!range)
return 0;
if (!startswith(range, "entries="))
return 0;
range += 8;
range += strspn(range, WHITESPACE);
colon = strchr(range, ':');
if (!colon)
m->cursor = strdup(range);
else {
const char *p;
colon2 = strchr(colon + 1, ':');
if (colon2) {
char _cleanup_free_ *t;
t = strndup(colon + 1, colon2 - colon - 1);
if (!t)
return -ENOMEM;
r = safe_atoi64(t, &m->n_skip);
if (r < 0)
return r;
}
p = (colon2 ? colon2 : colon) + 1;
if (*p) {
r = safe_atou64(p, &m->n_entries);
if (r < 0)
return r;
if (m->n_entries <= 0)
return -EINVAL;
m->n_entries_set = true;
}
m->cursor = strndup(range, colon - range);
}
if (!m->cursor)
return -ENOMEM;
m->cursor[strcspn(m->cursor, WHITESPACE)] = 0;
if (isempty(m->cursor)) {
free(m->cursor);
m->cursor = NULL;
}
return 0;
}
static int request_parse_arguments_iterator(
void *cls,
enum MHD_ValueKind kind,
const char *key,
const char *value) {
RequestMeta *m = cls;
_cleanup_free_ char *p = NULL;
int r;
assert(m);
if (isempty(key)) {
m->argument_parse_error = -EINVAL;
return MHD_NO;
}
if (streq(key, "follow")) {
if (isempty(value)) {
m->follow = true;
return MHD_YES;
}
r = parse_boolean(value);
if (r < 0) {
m->argument_parse_error = r;
return MHD_NO;
}
m->follow = r;
return MHD_YES;
}
if (streq(key, "discrete")) {
if (isempty(value)) {
m->discrete = true;
return MHD_YES;
}
r = parse_boolean(value);
if (r < 0) {
m->argument_parse_error = r;
return MHD_NO;
}
m->discrete = r;
return MHD_YES;
}
if (streq(key, "boot")) {
if (isempty(value))
r = true;
else {
r = parse_boolean(value);
if (r < 0) {
m->argument_parse_error = r;
return MHD_NO;
}
}
if (r) {
char match[9 + 32 + 1] = "_BOOT_ID=";
sd_id128_t bid;
r = sd_id128_get_boot(&bid);
if (r < 0) {
log_error("Failed to get boot ID: %s", strerror(-r));
return MHD_NO;
}
sd_id128_to_string(bid, match + 9);
r = sd_journal_add_match(m->journal, match, sizeof(match)-1);
if (r < 0) {
m->argument_parse_error = r;
return MHD_NO;
}
}
return MHD_YES;
}
p = strjoin(key, "=", strempty(value), NULL);
if (!p) {
m->argument_parse_error = log_oom();
return MHD_NO;
}
r = sd_journal_add_match(m->journal, p, 0);
if (r < 0) {
m->argument_parse_error = r;
return MHD_NO;
}
return MHD_YES;
}
static int request_parse_arguments(
RequestMeta *m,
struct MHD_Connection *connection) {
assert(m);
assert(connection);
m->argument_parse_error = 0;
MHD_get_connection_values(connection, MHD_GET_ARGUMENT_KIND, request_parse_arguments_iterator, m);
return m->argument_parse_error;
}
static int request_handler_entries(
struct MHD_Connection *connection,
void **connection_cls) {
struct MHD_Response *response;
RequestMeta *m;
int r;
assert(connection);
assert(connection_cls);
m = request_meta(connection_cls);
if (!m)
return respond_oom(connection);
r = open_journal(m);
if (r < 0)
return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r));
if (request_parse_accept(m, connection) < 0)
return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Accept header.\n");
if (request_parse_range(m, connection) < 0)
return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Range header.\n");
if (request_parse_arguments(m, connection) < 0)
return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse URL arguments.\n");
if (m->discrete) {
if (!m->cursor)
return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Discrete seeks require a cursor specification.\n");
m->n_entries = 1;
m->n_entries_set = true;
}
if (m->cursor)
r = sd_journal_seek_cursor(m->journal, m->cursor);
else if (m->n_skip >= 0)
r = sd_journal_seek_head(m->journal);
else if (m->n_skip < 0)
r = sd_journal_seek_tail(m->journal);
if (r < 0)
return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to seek in journal.\n");
response = MHD_create_response_from_callback(MHD_SIZE_UNKNOWN, 4*1024, request_reader_entries, m, NULL);
if (!response)
return respond_oom(connection);
MHD_add_response_header(response, "Content-Type", mime_types[m->mode]);
r = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
return r;
}
static int output_field(FILE *f, OutputMode m, const char *d, size_t l) {
const char *eq;
size_t j;
eq = memchr(d, '=', l);
if (!eq)
return -EINVAL;
j = l - (eq - d + 1);
if (m == OUTPUT_JSON) {
fprintf(f, "{ \"%.*s\" : ", (int) (eq - d), d);
json_escape(f, eq+1, j, OUTPUT_FULL_WIDTH);
fputs(" }\n", f);
} else {
fwrite(eq+1, 1, j, f);
fputc('\n', f);
}
return 0;
}
static ssize_t request_reader_fields(
void *cls,
uint64_t pos,
char *buf,
size_t max) {
RequestMeta *m = cls;
int r;
size_t n, k;
assert(m);
assert(buf);
assert(max > 0);
assert(pos >= m->delta);
pos -= m->delta;
while (pos >= m->size) {
off_t sz;
const void *d;
size_t l;
/* End of this field, so let's serialize the next
* one */
if (m->n_fields_set &&
m->n_fields <= 0)
return MHD_CONTENT_READER_END_OF_STREAM;
r = sd_journal_enumerate_unique(m->journal, &d, &l);
if (r < 0) {
log_error("Failed to advance field index: %s", strerror(-r));
return MHD_CONTENT_READER_END_WITH_ERROR;
} else if (r == 0)
return MHD_CONTENT_READER_END_OF_STREAM;
pos -= m->size;
m->delta += m->size;
if (m->n_fields_set)
m->n_fields -= 1;
if (m->tmp)
rewind(m->tmp);
else {
m->tmp = tmpfile();
if (!m->tmp) {
log_error("Failed to create temporary file: %m");
return MHD_CONTENT_READER_END_WITH_ERROR;
}
}
r = output_field(m->tmp, m->mode, d, l);
if (r < 0) {
log_error("Failed to serialize item: %s", strerror(-r));
return MHD_CONTENT_READER_END_WITH_ERROR;
}
sz = ftello(m->tmp);
if (sz == (off_t) -1) {
log_error("Failed to retrieve file position: %m");
return MHD_CONTENT_READER_END_WITH_ERROR;
}
m->size = (uint64_t) sz;
}
if (fseeko(m->tmp, pos, SEEK_SET) < 0) {
log_error("Failed to seek to position: %m");
return MHD_CONTENT_READER_END_WITH_ERROR;
}
n = m->size - pos;
if (n > max)
n = max;
errno = 0;
k = fread(buf, 1, n, m->tmp);
if (k != n) {
log_error("Failed to read from file: %s", errno ? strerror(errno) : "Premature EOF");
return MHD_CONTENT_READER_END_WITH_ERROR;
}
return (ssize_t) k;
}
static int request_handler_fields(
struct MHD_Connection *connection,
const char *field,
void *connection_cls) {
struct MHD_Response *response;
RequestMeta *m;
int r;
assert(connection);
assert(connection_cls);
m = request_meta(connection_cls);
if (!m)
return respond_oom(connection);
r = open_journal(m);
if (r < 0)
return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r));
if (request_parse_accept(m, connection) < 0)
return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Accept header.\n");
r = sd_journal_query_unique(m->journal, field);
if (r < 0)
return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to query unique fields.\n");
response = MHD_create_response_from_callback(MHD_SIZE_UNKNOWN, 4*1024, request_reader_fields, m, NULL);
if (!response)
return respond_oom(connection);
MHD_add_response_header(response, "Content-Type", mime_types[m->mode == OUTPUT_JSON ? OUTPUT_JSON : OUTPUT_SHORT]);
r = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
return r;
}
static int request_handler_redirect(
struct MHD_Connection *connection,
const char *target) {
char *page;
struct MHD_Response *response;
int ret;
assert(connection);
assert(target);
if (asprintf(&page, "<html><body>Please continue to the <a href=\"%s\">journal browser</a>.</body></html>", target) < 0)
return respond_oom(connection);
response = MHD_create_response_from_buffer(strlen(page), page, MHD_RESPMEM_MUST_FREE);
if (!response) {
free(page);
return respond_oom(connection);
}
MHD_add_response_header(response, "Content-Type", "text/html");
MHD_add_response_header(response, "Location", target);
ret = MHD_queue_response(connection, MHD_HTTP_MOVED_PERMANENTLY, response);
MHD_destroy_response(response);
return ret;
}
static int request_handler_file(
struct MHD_Connection *connection,
const char *path,
const char *mime_type) {
struct MHD_Response *response;
int ret;
_cleanup_close_ int fd = -1;
struct stat st;
assert(connection);
assert(path);
assert(mime_type);
fd = open(path, O_RDONLY|O_CLOEXEC);
if (fd < 0)
return respond_error(connection, MHD_HTTP_NOT_FOUND, "Failed to open file %s: %m\n", path);
if (fstat(fd, &st) < 0)
return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to stat file: %m\n");
response = MHD_create_response_from_fd_at_offset(st.st_size, fd, 0);
if (!response)
return respond_oom(connection);
fd = -1;
MHD_add_response_header(response, "Content-Type", mime_type);
ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
return ret;
}
static int request_handler_machine(
struct MHD_Connection *connection,
void **connection_cls) {
struct MHD_Response *response;
RequestMeta *m;
int r;
_cleanup_free_ char* hostname = NULL, *os_name = NULL;
uint64_t cutoff_from, cutoff_to, usage;
char *json;
sd_id128_t mid, bid;
const char *v = "bare";
assert(connection);
m = request_meta(connection_cls);
if (!m)
return respond_oom(connection);
r = open_journal(m);
if (r < 0)
return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r));
r = sd_id128_get_machine(&mid);
if (r < 0)
return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine machine ID: %s\n", strerror(-r));
r = sd_id128_get_boot(&bid);
if (r < 0)
return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine boot ID: %s\n", strerror(-r));
hostname = gethostname_malloc();
if (!hostname)
return respond_oom(connection);
r = sd_journal_get_usage(m->journal, &usage);
if (r < 0)
return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine disk usage: %s\n", strerror(-r));
r = sd_journal_get_cutoff_realtime_usec(m->journal, &cutoff_from, &cutoff_to);
if (r < 0)
return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to determine disk usage: %s\n", strerror(-r));
parse_env_file("/etc/os-release", NEWLINE, "PRETTY_NAME", &os_name, NULL);
detect_virtualization(&v);
r = asprintf(&json,
"{ \"machine_id\" : \"" SD_ID128_FORMAT_STR "\","
"\"boot_id\" : \"" SD_ID128_FORMAT_STR "\","
"\"hostname\" : \"%s\","
"\"os_pretty_name\" : \"%s\","
"\"virtualization\" : \"%s\","
"\"usage\" : \"%llu\","
"\"cutoff_from_realtime\" : \"%llu\","
"\"cutoff_to_realtime\" : \"%llu\" }\n",
SD_ID128_FORMAT_VAL(mid),
SD_ID128_FORMAT_VAL(bid),
hostname_cleanup(hostname),
os_name ? os_name : "Linux",
v,
(unsigned long long) usage,
(unsigned long long) cutoff_from,
(unsigned long long) cutoff_to);
if (r < 0)
return respond_oom(connection);
response = MHD_create_response_from_buffer(strlen(json), json, MHD_RESPMEM_MUST_FREE);
if (!response) {
free(json);
return respond_oom(connection);
}
MHD_add_response_header(response, "Content-Type", "application/json");
r = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
return r;
}
static int request_handler(
void *cls,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **connection_cls) {
assert(connection);
assert(url);
assert(method);
if (!streq(method, "GET"))
return MHD_NO;
if (streq(url, "/"))
return request_handler_redirect(connection, "/browse");
if (streq(url, "/entries"))
return request_handler_entries(connection, connection_cls);
if (startswith(url, "/fields/"))
return request_handler_fields(connection, url + 8, connection_cls);
if (streq(url, "/browse"))
return request_handler_file(connection, DOCUMENT_ROOT "/browse.html", "text/html");
if (streq(url, "/machine"))
return request_handler_machine(connection, connection_cls);
return respond_error(connection, MHD_HTTP_NOT_FOUND, "Not found.\n");
}
int main(int argc, char *argv[]) {
struct MHD_Daemon *d = NULL;
int r = EXIT_FAILURE, n;
if (argc > 1) {
log_error("This program does not take arguments.");
goto finish;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
n = sd_listen_fds(1);
if (n < 0) {
log_error("Failed to determine passed sockets: %s", strerror(-n));
goto finish;
} else if (n > 1) {
log_error("Can't listen on more than one socket.");
goto finish;
} else if (n > 0) {
d = MHD_start_daemon(
MHD_USE_THREAD_PER_CONNECTION|MHD_USE_POLL|MHD_USE_DEBUG,
19531,
NULL, NULL,
request_handler, NULL,
MHD_OPTION_LISTEN_SOCKET, SD_LISTEN_FDS_START,
MHD_OPTION_NOTIFY_COMPLETED, request_meta_free, NULL,
MHD_OPTION_END);
} else {
d = MHD_start_daemon(
MHD_USE_DEBUG|MHD_USE_THREAD_PER_CONNECTION|MHD_USE_POLL,
19531,
NULL, NULL,
request_handler, NULL,
MHD_OPTION_NOTIFY_COMPLETED, request_meta_free, NULL,
MHD_OPTION_END);
}
if (!d) {
log_error("Failed to start daemon!");
goto finish;
}
pause();
r = EXIT_SUCCESS;
finish:
if (d)
MHD_stop_daemon(d);
return r;
}
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