/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 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 .
***/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "sd-daemon.h"
#include "signal-util.h"
#include "journal-file.h"
#include "journald-native.h"
#include "socket-util.h"
#include "build.h"
#include "macro.h"
#include "strv.h"
#include "fileio.h"
#include "conf-parser.h"
#ifdef HAVE_GNUTLS
#include
#endif
#include "journal-remote.h"
#include "journal-remote-write.h"
#define REMOTE_JOURNAL_PATH "/var/log/journal/remote"
#define PRIV_KEY_FILE CERTIFICATE_ROOT "/private/journal-remote.pem"
#define CERT_FILE CERTIFICATE_ROOT "/certs/journal-remote.pem"
#define TRUST_FILE CERTIFICATE_ROOT "/ca/trusted.pem"
static char* arg_url = NULL;
static char* arg_getter = NULL;
static char* arg_listen_raw = NULL;
static char* arg_listen_http = NULL;
static char* arg_listen_https = NULL;
static char** arg_files = NULL;
static int arg_compress = true;
static int arg_seal = false;
static int http_socket = -1, https_socket = -1;
static char** arg_gnutls_log = NULL;
static JournalWriteSplitMode arg_split_mode = JOURNAL_WRITE_SPLIT_HOST;
static char* arg_output = NULL;
static char *arg_key = NULL;
static char *arg_cert = NULL;
static char *arg_trust = NULL;
static bool arg_trust_all = false;
/**********************************************************************
**********************************************************************
**********************************************************************/
static int spawn_child(const char* child, char** argv) {
int fd[2];
pid_t parent_pid, child_pid;
int r;
if (pipe(fd) < 0)
return log_error_errno(errno, "Failed to create pager pipe: %m");
parent_pid = getpid();
child_pid = fork();
if (child_pid < 0) {
r = log_error_errno(errno, "Failed to fork: %m");
safe_close_pair(fd);
return r;
}
/* In the child */
if (child_pid == 0) {
(void) reset_all_signal_handlers();
(void) reset_signal_mask();
r = dup2(fd[1], STDOUT_FILENO);
if (r < 0) {
log_error_errno(errno, "Failed to dup pipe to stdout: %m");
_exit(EXIT_FAILURE);
}
safe_close_pair(fd);
/* Make sure the child goes away when the parent dies */
if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
_exit(EXIT_FAILURE);
/* Check whether our parent died before we were able
* to set the death signal */
if (getppid() != parent_pid)
_exit(EXIT_SUCCESS);
execvp(child, argv);
log_error_errno(errno, "Failed to exec child %s: %m", child);
_exit(EXIT_FAILURE);
}
r = close(fd[1]);
if (r < 0)
log_warning_errno(errno, "Failed to close write end of pipe: %m");
return fd[0];
}
static int spawn_curl(const char* url) {
char **argv = STRV_MAKE("curl",
"-HAccept: application/vnd.fdo.journal",
"--silent",
"--show-error",
url);
int r;
r = spawn_child("curl", argv);
if (r < 0)
log_error_errno(errno, "Failed to spawn curl: %m");
return r;
}
static int spawn_getter(const char *getter, const char *url) {
int r;
_cleanup_strv_free_ char **words = NULL;
assert(getter);
r = strv_split_extract(&words, getter, WHITESPACE, EXTRACT_QUOTES);
if (r < 0)
return log_error_errno(r, "Failed to split getter option: %m");
r = strv_extend(&words, url);
if (r < 0)
return log_error_errno(r, "Failed to create command line: %m");
r = spawn_child(words[0], words);
if (r < 0)
log_error_errno(errno, "Failed to spawn getter %s: %m", getter);
return r;
}
#define filename_escape(s) xescape((s), "/ ")
static int open_output(Writer *w, const char* host) {
_cleanup_free_ char *_output = NULL;
const char *output;
int r;
switch (arg_split_mode) {
case JOURNAL_WRITE_SPLIT_NONE:
output = arg_output ?: REMOTE_JOURNAL_PATH "/remote.journal";
break;
case JOURNAL_WRITE_SPLIT_HOST: {
_cleanup_free_ char *name;
assert(host);
name = filename_escape(host);
if (!name)
return log_oom();
r = asprintf(&_output, "%s/remote-%s.journal",
arg_output ?: REMOTE_JOURNAL_PATH,
name);
if (r < 0)
return log_oom();
output = _output;
break;
}
default:
assert_not_reached("what?");
}
r = journal_file_open_reliably(output,
O_RDWR|O_CREAT, 0640,
arg_compress, arg_seal,
&w->metrics,
w->mmap,
NULL, &w->journal);
if (r < 0)
log_error_errno(r, "Failed to open output journal %s: %m",
output);
else
log_debug("Opened output file %s", w->journal->path);
return r;
}
/**********************************************************************
**********************************************************************
**********************************************************************/
static int init_writer_hashmap(RemoteServer *s) {
static const struct hash_ops *hash_ops[] = {
[JOURNAL_WRITE_SPLIT_NONE] = NULL,
[JOURNAL_WRITE_SPLIT_HOST] = &string_hash_ops,
};
assert(arg_split_mode >= 0 && arg_split_mode < (int) ELEMENTSOF(hash_ops));
s->writers = hashmap_new(hash_ops[arg_split_mode]);
if (!s->writers)
return log_oom();
return 0;
}
static int get_writer(RemoteServer *s, const char *host,
Writer **writer) {
const void *key;
_cleanup_writer_unref_ Writer *w = NULL;
int r;
switch(arg_split_mode) {
case JOURNAL_WRITE_SPLIT_NONE:
key = "one and only";
break;
case JOURNAL_WRITE_SPLIT_HOST:
assert(host);
key = host;
break;
default:
assert_not_reached("what split mode?");
}
w = hashmap_get(s->writers, key);
if (w)
writer_ref(w);
else {
w = writer_new(s);
if (!w)
return log_oom();
if (arg_split_mode == JOURNAL_WRITE_SPLIT_HOST) {
w->hashmap_key = strdup(key);
if (!w->hashmap_key)
return log_oom();
}
r = open_output(w, host);
if (r < 0)
return r;
r = hashmap_put(s->writers, w->hashmap_key ?: key, w);
if (r < 0)
return r;
}
*writer = w;
w = NULL;
return 0;
}
/**********************************************************************
**********************************************************************
**********************************************************************/
/* This should go away as soon as µhttpd allows state to be passed around. */
static RemoteServer *server;
static int dispatch_raw_source_event(sd_event_source *event,
int fd,
uint32_t revents,
void *userdata);
static int dispatch_raw_source_until_block(sd_event_source *event,
void *userdata);
static int dispatch_blocking_source_event(sd_event_source *event,
void *userdata);
static int dispatch_raw_connection_event(sd_event_source *event,
int fd,
uint32_t revents,
void *userdata);
static int dispatch_http_event(sd_event_source *event,
int fd,
uint32_t revents,
void *userdata);
static int get_source_for_fd(RemoteServer *s,
int fd, char *name, RemoteSource **source) {
Writer *writer;
int r;
/* This takes ownership of name, but only on success. */
assert(fd >= 0);
assert(source);
if (!GREEDY_REALLOC0(s->sources, s->sources_size, fd + 1))
return log_oom();
r = get_writer(s, name, &writer);
if (r < 0)
return log_warning_errno(r, "Failed to get writer for source %s: %m",
name);
if (s->sources[fd] == NULL) {
s->sources[fd] = source_new(fd, false, name, writer);
if (!s->sources[fd]) {
writer_unref(writer);
return log_oom();
}
s->active++;
}
*source = s->sources[fd];
return 0;
}
static int remove_source(RemoteServer *s, int fd) {
RemoteSource *source;
assert(s);
assert(fd >= 0 && fd < (ssize_t) s->sources_size);
source = s->sources[fd];
if (source) {
/* this closes fd too */
source_free(source);
s->sources[fd] = NULL;
s->active--;
}
return 0;
}
static int add_source(RemoteServer *s, int fd, char* name, bool own_name) {
RemoteSource *source = NULL;
int r;
/* This takes ownership of name, even on failure, if own_name is true. */
assert(s);
assert(fd >= 0);
assert(name);
if (!own_name) {
name = strdup(name);
if (!name)
return log_oom();
}
r = get_source_for_fd(s, fd, name, &source);
if (r < 0) {
log_error_errno(r, "Failed to create source for fd:%d (%s): %m",
fd, name);
free(name);
return r;
}
r = sd_event_add_io(s->events, &source->event,
fd, EPOLLIN|EPOLLRDHUP|EPOLLPRI,
dispatch_raw_source_event, source);
if (r == 0) {
/* Add additional source for buffer processing. It will be
* enabled later. */
r = sd_event_add_defer(s->events, &source->buffer_event,
dispatch_raw_source_until_block, source);
if (r == 0)
sd_event_source_set_enabled(source->buffer_event, SD_EVENT_OFF);
} else if (r == -EPERM) {
log_debug("Falling back to sd_event_add_defer for fd:%d (%s)", fd, name);
r = sd_event_add_defer(s->events, &source->event,
dispatch_blocking_source_event, source);
if (r == 0)
sd_event_source_set_enabled(source->event, SD_EVENT_ON);
}
if (r < 0) {
log_error_errno(r, "Failed to register event source for fd:%d: %m",
fd);
goto error;
}
r = sd_event_source_set_description(source->event, name);
if (r < 0) {
log_error_errno(r, "Failed to set source name for fd:%d: %m", fd);
goto error;
}
return 1; /* work to do */
error:
remove_source(s, fd);
return r;
}
static int add_raw_socket(RemoteServer *s, int fd) {
int r;
_cleanup_close_ int fd_ = fd;
char name[sizeof("raw-socket-")-1 + DECIMAL_STR_MAX(int) + 1];
assert(fd >= 0);
r = sd_event_add_io(s->events, &s->listen_event,
fd, EPOLLIN,
dispatch_raw_connection_event, s);
if (r < 0)
return r;
xsprintf(name, "raw-socket-%d", fd);
r = sd_event_source_set_description(s->listen_event, name);
if (r < 0)
return r;
fd_ = -1;
s->active ++;
return 0;
}
static int setup_raw_socket(RemoteServer *s, const char *address) {
int fd;
fd = make_socket_fd(LOG_INFO, address, SOCK_STREAM | SOCK_CLOEXEC);
if (fd < 0)
return fd;
return add_raw_socket(s, fd);
}
/**********************************************************************
**********************************************************************
**********************************************************************/
static int request_meta(void **connection_cls, int fd, char *hostname) {
RemoteSource *source;
Writer *writer;
int r;
assert(connection_cls);
if (*connection_cls)
return 0;
r = get_writer(server, hostname, &writer);
if (r < 0)
return log_warning_errno(r, "Failed to get writer for source %s: %m",
hostname);
source = source_new(fd, true, hostname, writer);
if (!source) {
writer_unref(writer);
return log_oom();
}
log_debug("Added RemoteSource as connection metadata %p", source);
*connection_cls = source;
return 0;
}
static void request_meta_free(void *cls,
struct MHD_Connection *connection,
void **connection_cls,
enum MHD_RequestTerminationCode toe) {
RemoteSource *s;
assert(connection_cls);
s = *connection_cls;
if (s) {
log_debug("Cleaning up connection metadata %p", s);
source_free(s);
*connection_cls = NULL;
}
}
static int process_http_upload(
struct MHD_Connection *connection,
const char *upload_data,
size_t *upload_data_size,
RemoteSource *source) {
bool finished = false;
size_t remaining;
int r;
assert(source);
log_trace("%s: connection %p, %zu bytes",
__func__, connection, *upload_data_size);
if (*upload_data_size) {
log_trace("Received %zu bytes", *upload_data_size);
r = push_data(source, upload_data, *upload_data_size);
if (r < 0)
return mhd_respond_oom(connection);
*upload_data_size = 0;
} else
finished = true;
while (true) {
r = process_source(source, arg_compress, arg_seal);
if (r == -EAGAIN)
break;
else if (r < 0) {
log_warning("Failed to process data for connection %p", connection);
if (r == -E2BIG)
return mhd_respondf(connection,
MHD_HTTP_REQUEST_ENTITY_TOO_LARGE,
"Entry is too large, maximum is %u bytes.\n",
DATA_SIZE_MAX);
else
return mhd_respondf(connection,
MHD_HTTP_UNPROCESSABLE_ENTITY,
"Processing failed: %s.", strerror(-r));
}
}
if (!finished)
return MHD_YES;
/* The upload is finished */
remaining = source_non_empty(source);
if (remaining > 0) {
log_warning("Premature EOFbyte. %zu bytes lost.", remaining);
return mhd_respondf(connection, MHD_HTTP_EXPECTATION_FAILED,
"Premature EOF. %zu bytes of trailing data not processed.",
remaining);
}
return mhd_respond(connection, MHD_HTTP_ACCEPTED, "OK.\n");
};
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) {
const char *header;
int r, code, fd;
_cleanup_free_ char *hostname = NULL;
assert(connection);
assert(connection_cls);
assert(url);
assert(method);
log_trace("Handling a connection %s %s %s", method, url, version);
if (*connection_cls)
return process_http_upload(connection,
upload_data, upload_data_size,
*connection_cls);
if (!streq(method, "POST"))
return mhd_respond(connection, MHD_HTTP_METHOD_NOT_ACCEPTABLE,
"Unsupported method.\n");
if (!streq(url, "/upload"))
return mhd_respond(connection, MHD_HTTP_NOT_FOUND,
"Not found.\n");
header = MHD_lookup_connection_value(connection,
MHD_HEADER_KIND, "Content-Type");
if (!header || !streq(header, "application/vnd.fdo.journal"))
return mhd_respond(connection, MHD_HTTP_UNSUPPORTED_MEDIA_TYPE,
"Content-Type: application/vnd.fdo.journal"
" is required.\n");
{
const union MHD_ConnectionInfo *ci;
ci = MHD_get_connection_info(connection,
MHD_CONNECTION_INFO_CONNECTION_FD);
if (!ci) {
log_error("MHD_get_connection_info failed: cannot get remote fd");
return mhd_respond(connection, MHD_HTTP_INTERNAL_SERVER_ERROR,
"Cannot check remote address");
}
fd = ci->connect_fd;
assert(fd >= 0);
}
if (server->check_trust) {
r = check_permissions(connection, &code, &hostname);
if (r < 0)
return code;
} else {
r = getnameinfo_pretty(fd, &hostname);
if (r < 0)
return mhd_respond(connection, MHD_HTTP_INTERNAL_SERVER_ERROR,
"Cannot check remote hostname");
}
assert(hostname);
r = request_meta(connection_cls, fd, hostname);
if (r == -ENOMEM)
return respond_oom(connection);
else if (r < 0)
return mhd_respond(connection, MHD_HTTP_INTERNAL_SERVER_ERROR,
strerror(-r));
hostname = NULL;
return MHD_YES;
}
static int setup_microhttpd_server(RemoteServer *s,
int fd,
const char *key,
const char *cert,
const char *trust) {
struct MHD_OptionItem opts[] = {
{ MHD_OPTION_NOTIFY_COMPLETED, (intptr_t) request_meta_free},
{ MHD_OPTION_EXTERNAL_LOGGER, (intptr_t) microhttpd_logger},
{ MHD_OPTION_LISTEN_SOCKET, fd},
{ MHD_OPTION_END},
{ MHD_OPTION_END},
{ MHD_OPTION_END},
{ MHD_OPTION_END}};
int opts_pos = 3;
int flags =
MHD_USE_DEBUG |
MHD_USE_PEDANTIC_CHECKS |
MHD_USE_EPOLL_LINUX_ONLY |
MHD_USE_DUAL_STACK;
const union MHD_DaemonInfo *info;
int r, epoll_fd;
MHDDaemonWrapper *d;
assert(fd >= 0);
r = fd_nonblock(fd, true);
if (r < 0)
return log_error_errno(r, "Failed to make fd:%d nonblocking: %m", fd);
if (key) {
assert(cert);
opts[opts_pos++] = (struct MHD_OptionItem)
{MHD_OPTION_HTTPS_MEM_KEY, 0, (char*) key};
opts[opts_pos++] = (struct MHD_OptionItem)
{MHD_OPTION_HTTPS_MEM_CERT, 0, (char*) cert};
flags |= MHD_USE_SSL;
if (trust)
opts[opts_pos++] = (struct MHD_OptionItem)
{MHD_OPTION_HTTPS_MEM_TRUST, 0, (char*) trust};
}
d = new(MHDDaemonWrapper, 1);
if (!d)
return log_oom();
d->fd = (uint64_t) fd;
d->daemon = MHD_start_daemon(flags, 0,
NULL, NULL,
request_handler, NULL,
MHD_OPTION_ARRAY, opts,
MHD_OPTION_END);
if (!d->daemon) {
log_error("Failed to start µhttp daemon");
r = -EINVAL;
goto error;
}
log_debug("Started MHD %s daemon on fd:%d (wrapper @ %p)",
key ? "HTTPS" : "HTTP", fd, d);
info = MHD_get_daemon_info(d->daemon, MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY);
if (!info) {
log_error("µhttp returned NULL daemon info");
r = -EOPNOTSUPP;
goto error;
}
epoll_fd = info->listen_fd;
if (epoll_fd < 0) {
log_error("µhttp epoll fd is invalid");
r = -EUCLEAN;
goto error;
}
r = sd_event_add_io(s->events, &d->event,
epoll_fd, EPOLLIN,
dispatch_http_event, d);
if (r < 0) {
log_error_errno(r, "Failed to add event callback: %m");
goto error;
}
r = sd_event_source_set_description(d->event, "epoll-fd");
if (r < 0) {
log_error_errno(r, "Failed to set source name: %m");
goto error;
}
r = hashmap_ensure_allocated(&s->daemons, &uint64_hash_ops);
if (r < 0) {
log_oom();
goto error;
}
r = hashmap_put(s->daemons, &d->fd, d);
if (r < 0) {
log_error_errno(r, "Failed to add daemon to hashmap: %m");
goto error;
}
s->active ++;
return 0;
error:
MHD_stop_daemon(d->daemon);
free(d->daemon);
free(d);
return r;
}
static int setup_microhttpd_socket(RemoteServer *s,
const char *address,
const char *key,
const char *cert,
const char *trust) {
int fd;
fd = make_socket_fd(LOG_DEBUG, address, SOCK_STREAM | SOCK_CLOEXEC);
if (fd < 0)
return fd;
return setup_microhttpd_server(s, fd, key, cert, trust);
}
static int dispatch_http_event(sd_event_source *event,
int fd,
uint32_t revents,
void *userdata) {
MHDDaemonWrapper *d = userdata;
int r;
assert(d);
r = MHD_run(d->daemon);
if (r == MHD_NO) {
log_error("MHD_run failed!");
// XXX: unregister daemon
return -EINVAL;
}
return 1; /* work to do */
}
/**********************************************************************
**********************************************************************
**********************************************************************/
static int setup_signals(RemoteServer *s) {
int r;
assert(s);
assert_se(sigprocmask_many(SIG_SETMASK, NULL, SIGINT, SIGTERM, -1) >= 0);
r = sd_event_add_signal(s->events, &s->sigterm_event, SIGTERM, NULL, s);
if (r < 0)
return r;
r = sd_event_add_signal(s->events, &s->sigint_event, SIGINT, NULL, s);
if (r < 0)
return r;
return 0;
}
static int negative_fd(const char *spec) {
/* Return a non-positive number as its inverse, -EINVAL otherwise. */
int fd, r;
r = safe_atoi(spec, &fd);
if (r < 0)
return r;
if (fd > 0)
return -EINVAL;
else
return -fd;
}
static int remoteserver_init(RemoteServer *s,
const char* key,
const char* cert,
const char* trust) {
int r, n, fd;
char **file;
assert(s);
if ((arg_listen_raw || arg_listen_http) && trust) {
log_error("Option --trust makes all non-HTTPS connections untrusted.");
return -EINVAL;
}
r = sd_event_default(&s->events);
if (r < 0)
return log_error_errno(r, "Failed to allocate event loop: %m");
setup_signals(s);
assert(server == NULL);
server = s;
r = init_writer_hashmap(s);
if (r < 0)
return r;
n = sd_listen_fds(true);
if (n < 0)
return log_error_errno(n, "Failed to read listening file descriptors from environment: %m");
else
log_debug("Received %d descriptors", n);
if (MAX(http_socket, https_socket) >= SD_LISTEN_FDS_START + n) {
log_error("Received fewer sockets than expected");
return -EBADFD;
}
for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
if (sd_is_socket(fd, AF_UNSPEC, 0, true)) {
log_debug("Received a listening socket (fd:%d)", fd);
if (fd == http_socket)
r = setup_microhttpd_server(s, fd, NULL, NULL, NULL);
else if (fd == https_socket)
r = setup_microhttpd_server(s, fd, key, cert, trust);
else
r = add_raw_socket(s, fd);
} else if (sd_is_socket(fd, AF_UNSPEC, 0, false)) {
char *hostname;
r = getnameinfo_pretty(fd, &hostname);
if (r < 0)
return log_error_errno(r, "Failed to retrieve remote name: %m");
log_debug("Received a connection socket (fd:%d) from %s", fd, hostname);
r = add_source(s, fd, hostname, true);
} else {
log_error("Unknown socket passed on fd:%d", fd);
return -EINVAL;
}
if (r < 0)
return log_error_errno(r, "Failed to register socket (fd:%d): %m",
fd);
}
if (arg_url) {
const char *url, *hostname;
url = strjoina(arg_url, "/entries");
if (arg_getter) {
log_info("Spawning getter %s...", url);
fd = spawn_getter(arg_getter, url);
} else {
log_info("Spawning curl %s...", url);
fd = spawn_curl(url);
}
if (fd < 0)
return fd;
hostname =
startswith(arg_url, "https://") ?:
startswith(arg_url, "http://") ?:
arg_url;
r = add_source(s, fd, (char*) hostname, false);
if (r < 0)
return r;
}
if (arg_listen_raw) {
log_debug("Listening on a socket...");
r = setup_raw_socket(s, arg_listen_raw);
if (r < 0)
return r;
}
if (arg_listen_http) {
r = setup_microhttpd_socket(s, arg_listen_http, NULL, NULL, NULL);
if (r < 0)
return r;
}
if (arg_listen_https) {
r = setup_microhttpd_socket(s, arg_listen_https, key, cert, trust);
if (r < 0)
return r;
}
STRV_FOREACH(file, arg_files) {
const char *output_name;
if (streq(*file, "-")) {
log_debug("Using standard input as source.");
fd = STDIN_FILENO;
output_name = "stdin";
} else {
log_debug("Reading file %s...", *file);
fd = open(*file, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
if (fd < 0)
return log_error_errno(errno, "Failed to open %s: %m", *file);
output_name = *file;
}
r = add_source(s, fd, (char*) output_name, false);
if (r < 0)
return r;
}
if (s->active == 0) {
log_error("Zarro sources specified");
return -EINVAL;
}
if (arg_split_mode == JOURNAL_WRITE_SPLIT_NONE) {
/* In this case we know what the writer will be
called, so we can create it and verify that we can
create output as expected. */
r = get_writer(s, NULL, &s->_single_writer);
if (r < 0)
return r;
}
return 0;
}
static void server_destroy(RemoteServer *s) {
size_t i;
MHDDaemonWrapper *d;
while ((d = hashmap_steal_first(s->daemons))) {
MHD_stop_daemon(d->daemon);
sd_event_source_unref(d->event);
free(d);
}
hashmap_free(s->daemons);
assert(s->sources_size == 0 || s->sources);
for (i = 0; i < s->sources_size; i++)
remove_source(s, i);
free(s->sources);
writer_unref(s->_single_writer);
hashmap_free(s->writers);
sd_event_source_unref(s->sigterm_event);
sd_event_source_unref(s->sigint_event);
sd_event_source_unref(s->listen_event);
sd_event_unref(s->events);
/* fds that we're listening on remain open... */
}
/**********************************************************************
**********************************************************************
**********************************************************************/
static int handle_raw_source(sd_event_source *event,
int fd,
uint32_t revents,
RemoteServer *s) {
RemoteSource *source;
int r;
/* Returns 1 if there might be more data pending,
* 0 if data is currently exhausted, negative on error.
*/
assert(fd >= 0 && fd < (ssize_t) s->sources_size);
source = s->sources[fd];
assert(source->fd == fd);
r = process_source(source, arg_compress, arg_seal);
if (source->state == STATE_EOF) {
size_t remaining;
log_debug("EOF reached with source fd:%d (%s)",
source->fd, source->name);
remaining = source_non_empty(source);
if (remaining > 0)
log_notice("Premature EOF. %zu bytes lost.", remaining);
remove_source(s, source->fd);
log_debug("%zu active sources remaining", s->active);
return 0;
} else if (r == -E2BIG) {
log_notice_errno(E2BIG, "Entry too big, skipped");
return 1;
} else if (r == -EAGAIN) {
return 0;
} else if (r < 0) {
log_debug_errno(r, "Closing connection: %m");
remove_source(server, fd);
return 0;
} else
return 1;
}
static int dispatch_raw_source_until_block(sd_event_source *event,
void *userdata) {
RemoteSource *source = userdata;
int r;
/* Make sure event stays around even if source is destroyed */
sd_event_source_ref(event);
r = handle_raw_source(event, source->fd, EPOLLIN, server);
if (r != 1)
/* No more data for now */
sd_event_source_set_enabled(event, SD_EVENT_OFF);
sd_event_source_unref(event);
return r;
}
static int dispatch_raw_source_event(sd_event_source *event,
int fd,
uint32_t revents,
void *userdata) {
RemoteSource *source = userdata;
int r;
assert(source->event);
assert(source->buffer_event);
r = handle_raw_source(event, fd, EPOLLIN, server);
if (r == 1)
/* Might have more data. We need to rerun the handler
* until we are sure the buffer is exhausted. */
sd_event_source_set_enabled(source->buffer_event, SD_EVENT_ON);
return r;
}
static int dispatch_blocking_source_event(sd_event_source *event,
void *userdata) {
RemoteSource *source = userdata;
return handle_raw_source(event, source->fd, EPOLLIN, server);
}
static int accept_connection(const char* type, int fd,
SocketAddress *addr, char **hostname) {
int fd2, r;
log_debug("Accepting new %s connection on fd:%d", type, fd);
fd2 = accept4(fd, &addr->sockaddr.sa, &addr->size, SOCK_NONBLOCK|SOCK_CLOEXEC);
if (fd2 < 0)
return log_error_errno(errno, "accept() on fd:%d failed: %m", fd);
switch(socket_address_family(addr)) {
case AF_INET:
case AF_INET6: {
_cleanup_free_ char *a = NULL;
char *b;
r = socket_address_print(addr, &a);
if (r < 0) {
log_error_errno(r, "socket_address_print(): %m");
close(fd2);
return r;
}
r = socknameinfo_pretty(&addr->sockaddr, addr->size, &b);
if (r < 0) {
log_error_errno(r, "Resolving hostname failed: %m");
close(fd2);
return r;
}
log_debug("Accepted %s %s connection from %s",
type,
socket_address_family(addr) == AF_INET ? "IP" : "IPv6",
a);
*hostname = b;
return fd2;
};
default:
log_error("Rejected %s connection with unsupported family %d",
type, socket_address_family(addr));
close(fd2);
return -EINVAL;
}
}
static int dispatch_raw_connection_event(sd_event_source *event,
int fd,
uint32_t revents,
void *userdata) {
RemoteServer *s = userdata;
int fd2;
SocketAddress addr = {
.size = sizeof(union sockaddr_union),
.type = SOCK_STREAM,
};
char *hostname = NULL;
fd2 = accept_connection("raw", fd, &addr, &hostname);
if (fd2 < 0)
return fd2;
return add_source(s, fd2, hostname, true);
}
/**********************************************************************
**********************************************************************
**********************************************************************/
static const char* const journal_write_split_mode_table[_JOURNAL_WRITE_SPLIT_MAX] = {
[JOURNAL_WRITE_SPLIT_NONE] = "none",
[JOURNAL_WRITE_SPLIT_HOST] = "host",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP(journal_write_split_mode, JournalWriteSplitMode);
static DEFINE_CONFIG_PARSE_ENUM(config_parse_write_split_mode,
journal_write_split_mode,
JournalWriteSplitMode,
"Failed to parse split mode setting");
static int parse_config(void) {
const ConfigTableItem items[] = {
{ "Remote", "SplitMode", config_parse_write_split_mode, 0, &arg_split_mode },
{ "Remote", "ServerKeyFile", config_parse_path, 0, &arg_key },
{ "Remote", "ServerCertificateFile", config_parse_path, 0, &arg_cert },
{ "Remote", "TrustedCertificateFile", config_parse_path, 0, &arg_trust },
{}};
return config_parse_many(PKGSYSCONFDIR "/journal-remote.conf",
CONF_DIRS_NULSTR("systemd/journal-remote.conf"),
"Remote\0", config_item_table_lookup, items,
false, NULL);
}
static void help(void) {
printf("%s [OPTIONS...] {FILE|-}...\n\n"
"Write external journal events to journal file(s).\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --url=URL Read events from systemd-journal-gatewayd at URL\n"
" --getter=COMMAND Read events from the output of COMMAND\n"
" --listen-raw=ADDR Listen for connections at ADDR\n"
" --listen-http=ADDR Listen for HTTP connections at ADDR\n"
" --listen-https=ADDR Listen for HTTPS connections at ADDR\n"
" -o --output=FILE|DIR Write output to FILE or DIR/external-*.journal\n"
" --compress[=BOOL] XZ-compress the output journal (default: yes)\n"
" --seal[=BOOL] Use event sealing (default: no)\n"
" --key=FILENAME SSL key in PEM format (default:\n"
" \"" PRIV_KEY_FILE "\")\n"
" --cert=FILENAME SSL certificate in PEM format (default:\n"
" \"" CERT_FILE "\")\n"
" --trust=FILENAME|all SSL CA certificate or disable checking (default:\n"
" \"" TRUST_FILE "\")\n"
" --gnutls-log=CATEGORY...\n"
" Specify a list of gnutls logging categories\n"
" --split-mode=none|host How many output files to create\n"
"\n"
"Note: file descriptors from sd_listen_fds() will be consumed, too.\n"
, program_invocation_short_name);
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_URL,
ARG_LISTEN_RAW,
ARG_LISTEN_HTTP,
ARG_LISTEN_HTTPS,
ARG_GETTER,
ARG_SPLIT_MODE,
ARG_COMPRESS,
ARG_SEAL,
ARG_KEY,
ARG_CERT,
ARG_TRUST,
ARG_GNUTLS_LOG,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "url", required_argument, NULL, ARG_URL },
{ "getter", required_argument, NULL, ARG_GETTER },
{ "listen-raw", required_argument, NULL, ARG_LISTEN_RAW },
{ "listen-http", required_argument, NULL, ARG_LISTEN_HTTP },
{ "listen-https", required_argument, NULL, ARG_LISTEN_HTTPS },
{ "output", required_argument, NULL, 'o' },
{ "split-mode", required_argument, NULL, ARG_SPLIT_MODE },
{ "compress", optional_argument, NULL, ARG_COMPRESS },
{ "seal", optional_argument, NULL, ARG_SEAL },
{ "key", required_argument, NULL, ARG_KEY },
{ "cert", required_argument, NULL, ARG_CERT },
{ "trust", required_argument, NULL, ARG_TRUST },
{ "gnutls-log", required_argument, NULL, ARG_GNUTLS_LOG },
{}
};
int c, r;
bool type_a, type_b;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "ho:", options, NULL)) >= 0)
switch(c) {
case 'h':
help();
return 0 /* done */;
case ARG_VERSION:
puts(PACKAGE_STRING);
puts(SYSTEMD_FEATURES);
return 0 /* done */;
case ARG_URL:
if (arg_url) {
log_error("cannot currently set more than one --url");
return -EINVAL;
}
arg_url = optarg;
break;
case ARG_GETTER:
if (arg_getter) {
log_error("cannot currently use --getter more than once");
return -EINVAL;
}
arg_getter = optarg;
break;
case ARG_LISTEN_RAW:
if (arg_listen_raw) {
log_error("cannot currently use --listen-raw more than once");
return -EINVAL;
}
arg_listen_raw = optarg;
break;
case ARG_LISTEN_HTTP:
if (arg_listen_http || http_socket >= 0) {
log_error("cannot currently use --listen-http more than once");
return -EINVAL;
}
r = negative_fd(optarg);
if (r >= 0)
http_socket = r;
else
arg_listen_http = optarg;
break;
case ARG_LISTEN_HTTPS:
if (arg_listen_https || https_socket >= 0) {
log_error("cannot currently use --listen-https more than once");
return -EINVAL;
}
r = negative_fd(optarg);
if (r >= 0)
https_socket = r;
else
arg_listen_https = optarg;
break;
case ARG_KEY:
if (arg_key) {
log_error("Key file specified twice");
return -EINVAL;
}
arg_key = strdup(optarg);
if (!arg_key)
return log_oom();
break;
case ARG_CERT:
if (arg_cert) {
log_error("Certificate file specified twice");
return -EINVAL;
}
arg_cert = strdup(optarg);
if (!arg_cert)
return log_oom();
break;
case ARG_TRUST:
if (arg_trust || arg_trust_all) {
log_error("Confusing trusted CA configuration");
return -EINVAL;
}
if (streq(optarg, "all"))
arg_trust_all = true;
else {
#ifdef HAVE_GNUTLS
arg_trust = strdup(optarg);
if (!arg_trust)
return log_oom();
#else
log_error("Option --trust is not available.");
return -EINVAL;
#endif
}
break;
case 'o':
if (arg_output) {
log_error("cannot use --output/-o more than once");
return -EINVAL;
}
arg_output = optarg;
break;
case ARG_SPLIT_MODE:
arg_split_mode = journal_write_split_mode_from_string(optarg);
if (arg_split_mode == _JOURNAL_WRITE_SPLIT_INVALID) {
log_error("Invalid split mode: %s", optarg);
return -EINVAL;
}
break;
case ARG_COMPRESS:
if (optarg) {
r = parse_boolean(optarg);
if (r < 0) {
log_error("Failed to parse --compress= parameter.");
return -EINVAL;
}
arg_compress = !!r;
} else
arg_compress = true;
break;
case ARG_SEAL:
if (optarg) {
r = parse_boolean(optarg);
if (r < 0) {
log_error("Failed to parse --seal= parameter.");
return -EINVAL;
}
arg_seal = !!r;
} else
arg_seal = true;
break;
case ARG_GNUTLS_LOG: {
#ifdef HAVE_GNUTLS
const char *word, *state;
size_t size;
FOREACH_WORD_SEPARATOR(word, size, optarg, ",", state) {
char *cat;
cat = strndup(word, size);
if (!cat)
return log_oom();
if (strv_consume(&arg_gnutls_log, cat) < 0)
return log_oom();
}
break;
#else
log_error("Option --gnutls-log is not available.");
return -EINVAL;
#endif
}
case '?':
return -EINVAL;
default:
assert_not_reached("Unknown option code.");
}
if (optind < argc)
arg_files = argv + optind;
type_a = arg_getter || !strv_isempty(arg_files);
type_b = arg_url
|| arg_listen_raw
|| arg_listen_http || arg_listen_https
|| sd_listen_fds(false) > 0;
if (type_a && type_b) {
log_error("Cannot use file input or --getter with "
"--arg-listen-... or socket activation.");
return -EINVAL;
}
if (type_a) {
if (!arg_output) {
log_error("Option --output must be specified with file input or --getter.");
return -EINVAL;
}
arg_split_mode = JOURNAL_WRITE_SPLIT_NONE;
}
if (arg_split_mode == JOURNAL_WRITE_SPLIT_NONE
&& arg_output && is_dir(arg_output, true) > 0) {
log_error("For SplitMode=none, output must be a file.");
return -EINVAL;
}
if (arg_split_mode == JOURNAL_WRITE_SPLIT_HOST
&& arg_output && is_dir(arg_output, true) <= 0) {
log_error("For SplitMode=host, output must be a directory.");
return -EINVAL;
}
log_debug("Full config: SplitMode=%s Key=%s Cert=%s Trust=%s",
journal_write_split_mode_to_string(arg_split_mode),
strna(arg_key),
strna(arg_cert),
strna(arg_trust));
return 1 /* work to do */;
}
static int load_certificates(char **key, char **cert, char **trust) {
int r;
r = read_full_file(arg_key ?: PRIV_KEY_FILE, key, NULL);
if (r < 0)
return log_error_errno(r, "Failed to read key from file '%s': %m",
arg_key ?: PRIV_KEY_FILE);
r = read_full_file(arg_cert ?: CERT_FILE, cert, NULL);
if (r < 0)
return log_error_errno(r, "Failed to read certificate from file '%s': %m",
arg_cert ?: CERT_FILE);
if (arg_trust_all)
log_info("Certificate checking disabled.");
else {
r = read_full_file(arg_trust ?: TRUST_FILE, trust, NULL);
if (r < 0)
return log_error_errno(r, "Failed to read CA certificate file '%s': %m",
arg_trust ?: TRUST_FILE);
}
return 0;
}
int main(int argc, char **argv) {
RemoteServer s = {};
int r;
_cleanup_free_ char *key = NULL, *cert = NULL, *trust = NULL;
log_show_color(true);
log_parse_environment();
r = parse_config();
if (r < 0)
return EXIT_FAILURE;
r = parse_argv(argc, argv);
if (r <= 0)
return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
if (arg_listen_http || arg_listen_https) {
r = setup_gnutls_logger(arg_gnutls_log);
if (r < 0)
return EXIT_FAILURE;
}
if (arg_listen_https || https_socket >= 0)
if (load_certificates(&key, &cert, &trust) < 0)
return EXIT_FAILURE;
if (remoteserver_init(&s, key, cert, trust) < 0)
return EXIT_FAILURE;
r = sd_event_set_watchdog(s.events, true);
if (r < 0)
log_error_errno(r, "Failed to enable watchdog: %m");
else
log_debug("Watchdog is %s.", r > 0 ? "enabled" : "disabled");
log_debug("%s running as pid "PID_FMT,
program_invocation_short_name, getpid());
sd_notify(false,
"READY=1\n"
"STATUS=Processing requests...");
while (s.active) {
r = sd_event_get_state(s.events);
if (r < 0)
break;
if (r == SD_EVENT_FINISHED)
break;
r = sd_event_run(s.events, -1);
if (r < 0) {
log_error_errno(r, "Failed to run event loop: %m");
break;
}
}
sd_notifyf(false,
"STOPPING=1\n"
"STATUS=Shutting down after writing %" PRIu64 " entries...", s.event_count);
log_info("Finishing after writing %" PRIu64 " entries", s.event_count);
server_destroy(&s);
free(arg_key);
free(arg_cert);
free(arg_trust);
return r >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}