90N/A

5680N/A

90N/A#include <sys/epoll.h>

5680N/A#include <sys/socket.h>

5680N/A#include <errno.h>

5680N/A#include <sys/signalfd.h>

90N/A#include <unistd.h>

90N/A#include <fcntl.h>

90N/A#include <sys/acl.h>

4466N/A#include <acl/libacl.h>

618N/A#include <stddef.h>

844N/A#include <sys/ioctl.h>

4466N/A#include <linux/sockios.h>

618N/A#include <sys/statvfs.h>

90N/A

4466N/A#include "hashmap.h"

4466N/A#include "journal-file.h"

7243N/A#include "sd-daemon.h"

7243N/A#include "socket-util.h"

7243N/A#include "acl-util.h"

7243N/A#include "cgroup-util.h"

7381N/A#include "list.h"

5680N/A#include "journal-rate-limit.h"

90N/A#include "sd-journal.h"

6251N/A#include "journal-internal.h"

6251N/A

6251N/A#define USER_JOURNALS_MAX 1024

6251N/A#define STDOUT_STREAMS_MAX 4096

6251N/A

5824N/A#define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC)

5824N/A#define DEFAULT_RATE_LIMIT_BURST 200

5824N/A

1530N/A#define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC)

1530N/A

2626N/A#define RECHECK_VAR_AVAILABLE_USEC (30*USEC_PER_SEC)

422N/A

2294N/A#define SYSLOG_TIMEOUT_USEC (5*USEC_PER_SEC)

2294N/A

2294N/Atypedef struct StdoutStream StdoutStream;

2294N/A

90N/Atypedef struct Server {

90N/A int epoll_fd;

90N/A int signal_fd;

90N/A int syslog_fd;

7381N/A int native_fd;

7381N/A int stdout_fd;

7381N/A

7381N/A JournalFile *runtime_journal;

7381N/A JournalFile *system_journal;

1136N/A Hashmap *user_journals;

1136N/A

1136N/A uint64_t seqnum;

7381N/A

7381N/A char *buffer;

7381N/A size_t buffer_size;

7381N/A

7381N/A JournalRateLimit *rate_limit;

7381N/A

7381N/A JournalMetrics metrics;

7381N/A uint64_t max_use;

7381N/A bool compress;

3817N/A

uint64_t cached_available_space;

usec_t cached_available_space_timestamp;

uint64_t var_available_timestamp;

LIST_HEAD(StdoutStream, stdout_streams);

unsigned n_stdout_streams;

} Server;

typedef enum StdoutStreamState {

STDOUT_STREAM_TAG,

STDOUT_STREAM_PRIORITY,

STDOUT_STREAM_PRIORITY_PREFIX,

STDOUT_STREAM_TEE_CONSOLE,

STDOUT_STREAM_RUNNING

} StdoutStreamState;

struct StdoutStream {

Server *server;

StdoutStreamState state;

int fd;

struct ucred ucred;

char *tag;

int priority;

bool priority_prefix:1;

bool tee_console:1;

char buffer[LINE_MAX+1];

size_t length;

LIST_FIELDS(StdoutStream, stdout_stream);

};

static int server_flush_to_var(Server *s);

static uint64_t available_space(Server *s) {

char ids[33];

sd_id128_t machine;

char *p;

const char *f;

struct statvfs ss;

uint64_t sum = 0, avail = 0, ss_avail = 0;

int r;

DIR *d;

usec_t ts = now(CLOCK_MONOTONIC);

if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts)

return s->cached_available_space;

r = sd_id128_get_machine(&machine);

if (r < 0)

return 0;

if (s->system_journal)

f = "/var/log/journal/";

else

f = "/run/log/journal/";

p = strappend(f, sd_id128_to_string(machine, ids));

if (!p)

return 0;

d = opendir(p);

free(p);

if (!d)

return 0;

if (fstatvfs(dirfd(d), &ss) < 0)

goto finish;

for (;;) {

struct stat st;

struct dirent buf, *de;

int k;

k = readdir_r(d, &buf, &de);

if (k != 0) {

r = -k;

goto finish;

}

if (!de)

break;

if (!dirent_is_file_with_suffix(de, ".journal"))

continue;

if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)

continue;

sum += (uint64_t) st.st_blocks * (uint64_t) st.st_blksize;

}

avail = sum >= s->max_use ? 0 : s->max_use - sum;

ss_avail = ss.f_bsize * ss.f_bavail;

ss_avail = ss_avail < s->metrics.keep_free ? 0 : ss_avail - s->metrics.keep_free;

if (ss_avail < avail)

avail = ss_avail;

s->cached_available_space = avail;

s->cached_available_space_timestamp = ts;

finish:

closedir(d);

return avail;

}

static void fix_perms(JournalFile *f, uid_t uid) {

acl_t acl;

acl_entry_t entry;

acl_permset_t permset;

int r;

assert(f);

r = fchmod_and_fchown(f->fd, 0640, 0, 0);

if (r < 0)

log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));

if (uid <= 0)

return;

acl = acl_get_fd(f->fd);

if (!acl) {

log_warning("Failed to read ACL on %s, ignoring: %m", f->path);

return;

}

r = acl_find_uid(acl, uid, &entry);

if (r <= 0) {

if (acl_create_entry(&acl, &entry) < 0 ||

acl_set_tag_type(entry, ACL_USER) < 0 ||

acl_set_qualifier(entry, &uid) < 0) {

log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);

goto finish;

}

}

if (acl_get_permset(entry, &permset) < 0 ||

acl_add_perm(permset, ACL_READ) < 0 ||

acl_calc_mask(&acl) < 0) {

log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);

goto finish;

}

if (acl_set_fd(f->fd, acl) < 0)

log_warning("Failed to set ACL on %s, ignoring: %m", f->path);

finish:

acl_free(acl);

}

static JournalFile* find_journal(Server *s, uid_t uid) {

char *p;

int r;

JournalFile *f;

char ids[33];

sd_id128_t machine;

assert(s);

/* We split up user logs only on /var, not on /run. If the

if (s->runtime_journal)

return s->runtime_journal;

if (uid <= 0)

return s->system_journal;

r = sd_id128_get_machine(&machine);

if (r < 0)

return s->system_journal;

f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));

if (f)

return f;

if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)

return s->system_journal;

while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {

/* Too many open? Then let's close one */

f = hashmap_steal_first(s->user_journals);

assert(f);

journal_file_close(f);

}

r = journal_file_open(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);

free(p);

if (r < 0)

return s->system_journal;

fix_perms(f, uid);

f->metrics = s->metrics;

f->compress = s->compress;

r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);

if (r < 0) {

journal_file_close(f);

return s->system_journal;

}

return f;

}

static void server_vacuum(Server *s) {

Iterator i;

void *k;

char *p;

char ids[33];

sd_id128_t machine;

int r;

JournalFile *f;

log_info("Rotating...");

if (s->runtime_journal) {

r = journal_file_rotate(&s->runtime_journal);

if (r < 0)

log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));

}

if (s->system_journal) {

r = journal_file_rotate(&s->system_journal);

if (r < 0)

log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));

}

HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {

r = journal_file_rotate(&f);

if (r < 0)

log_error("Failed to rotate %s: %s", f->path, strerror(-r));

else

hashmap_replace(s->user_journals, k, f);

}

log_info("Vacuuming...");

r = sd_id128_get_machine(&machine);

if (r < 0) {

log_error("Failed to get machine ID: %s", strerror(-r));

return;

}

if (asprintf(&p, "/var/log/journal/%s", sd_id128_to_string(machine, ids)) < 0) {

log_error("Out of memory.");

return;

}

r = journal_directory_vacuum(p, s->max_use, s->metrics.keep_free);

if (r < 0 && r != -ENOENT)

log_error("Failed to vacuum %s: %s", p, strerror(-r));

free(p);

if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {

log_error("Out of memory.");

return;

}

r = journal_directory_vacuum(p, s->max_use, s->metrics.keep_free);

if (r < 0 && r != -ENOENT)

log_error("Failed to vacuum %s: %s", p, strerror(-r));

free(p);

s->cached_available_space_timestamp = 0;

}

static char *shortened_cgroup_path(pid_t pid) {

int r;

char *process_path, *init_path, *path;

assert(pid > 0);

r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);

if (r < 0)

return NULL;

r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);

if (r < 0) {

free(process_path);

return NULL;

}

if (streq(init_path, "/"))

init_path[0] = 0;

if (startswith(process_path, init_path))

path = process_path + strlen(init_path);

else

path = process_path;

free(init_path);

return path;

}

static void dispatch_message_real(Server *s,

struct iovec *iovec, unsigned n, unsigned m,

struct ucred *ucred,

struct timeval *tv) {

char *pid = NULL, *uid = NULL, *gid = NULL,

*source_time = NULL, *boot_id = NULL, *machine_id = NULL,

*comm = NULL, *cmdline = NULL, *hostname = NULL,

*audit_session = NULL, *audit_loginuid = NULL,

*exe = NULL, *cgroup = NULL;

char idbuf[33];

sd_id128_t id;

int r;

char *t;

uid_t loginuid = 0, realuid = 0;

JournalFile *f;

bool vacuumed = false;

assert(s);

assert(iovec);

assert(n > 0);

assert(n + 13 <= m);

if (ucred) {

uint32_t session;

char *path;

realuid = ucred->uid;

if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)

IOVEC_SET_STRING(iovec[n++], pid);

if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)

IOVEC_SET_STRING(iovec[n++], uid);

if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)

IOVEC_SET_STRING(iovec[n++], gid);

r = get_process_comm(ucred->pid, &t);

if (r >= 0) {

comm = strappend("_COMM=", t);

if (comm)

IOVEC_SET_STRING(iovec[n++], comm);

free(t);

}

r = get_process_exe(ucred->pid, &t);

if (r >= 0) {

exe = strappend("_EXE=", t);

if (comm)

IOVEC_SET_STRING(iovec[n++], exe);

free(t);

}

r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);

if (r >= 0) {

cmdline = strappend("_CMDLINE=", t);

if (cmdline)

IOVEC_SET_STRING(iovec[n++], cmdline);

free(t);

}

r = audit_session_from_pid(ucred->pid, &session);

if (r >= 0)

if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) session) >= 0)

IOVEC_SET_STRING(iovec[n++], audit_session);

r = audit_loginuid_from_pid(ucred->pid, &loginuid);

if (r >= 0)

if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)

IOVEC_SET_STRING(iovec[n++], audit_loginuid);

path = shortened_cgroup_path(ucred->pid);

if (path) {

cgroup = strappend("_SYSTEMD_CGROUP=", path);

if (cgroup)

IOVEC_SET_STRING(iovec[n++], cgroup);

free(path);

}

}

if (tv) {

if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",

(unsigned long long) timeval_load(tv)) >= 0)

IOVEC_SET_STRING(iovec[n++], source_time);

}

/* Note that strictly speaking storing the boot id here is

r = sd_id128_get_boot(&id);

if (r >= 0)

if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)

IOVEC_SET_STRING(iovec[n++], boot_id);

r = sd_id128_get_machine(&id);

if (r >= 0)

if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)

IOVEC_SET_STRING(iovec[n++], machine_id);

t = gethostname_malloc();

if (t) {

hostname = strappend("_HOSTNAME=", t);

if (hostname)

IOVEC_SET_STRING(iovec[n++], hostname);

free(t);

}

assert(n <= m);

server_flush_to_var(s);

retry:

f = find_journal(s, realuid == 0 ? 0 : loginuid);

if (!f)

log_warning("Dropping message, as we can't find a place to store the data.");

else {

r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);

if (r == -E2BIG && !vacuumed) {

log_info("Allocation limit reached.");

server_vacuum(s);

vacuumed = true;

log_info("Retrying write.");

goto retry;

}

if (r < 0)

log_error("Failed to write entry, ignoring: %s", strerror(-r));

}

free(pid);

free(uid);

free(gid);

free(comm);

free(exe);

free(cmdline);

free(source_time);

free(boot_id);

free(machine_id);

free(hostname);

free(audit_session);

free(audit_loginuid);

free(cgroup);

}

static void dispatch_message(Server *s,

struct iovec *iovec, unsigned n, unsigned m,

struct ucred *ucred,

struct timeval *tv,

int priority) {

int rl;

char *path, *c;

assert(s);

assert(iovec || n == 0);

if (n == 0)

return;

if (!ucred)

goto finish;

path = shortened_cgroup_path(ucred->pid);

if (!path)

goto finish;

/* example: /user/lennart/3/foobar

c = strchr(path, '/');

if (c) {

c = strchr(c+1, '/');

if (c) {

c = strchr(c+1, '/');

if (c)

*c = 0;

}

}

rl = journal_rate_limit_test(s->rate_limit, path, priority, available_space(s));

if (rl == 0) {

free(path);

return;

}

if (rl > 1) {

int j = 0;

char suppress_message[LINE_MAX];

struct iovec suppress_iovec[15];

/* Write a suppression message if we suppressed something */

snprintf(suppress_message, sizeof(suppress_message), "MESSAGE=Suppressed %u messages from %s", rl - 1, path);

char_array_0(suppress_message);

IOVEC_SET_STRING(suppress_iovec[j++], "PRIORITY=5");

IOVEC_SET_STRING(suppress_iovec[j++], suppress_message);

dispatch_message_real(s, suppress_iovec, j, ELEMENTSOF(suppress_iovec), NULL, NULL);

}

free(path);

finish:

dispatch_message_real(s, iovec, n, m, ucred, tv);

}

static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {

char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL;

struct iovec iovec[16];

unsigned n = 0;

int priority = LOG_USER | LOG_INFO;

assert(s);

assert(buf);

parse_syslog_priority((char**) &buf, &priority);

skip_syslog_date((char**) &buf);

if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)

IOVEC_SET_STRING(iovec[n++], syslog_priority);

if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)

IOVEC_SET_STRING(iovec[n++], syslog_facility);

message = strappend("MESSAGE=", buf);

if (message)

IOVEC_SET_STRING(iovec[n++], message);

dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, priority & LOG_PRIMASK);

free(message);

free(syslog_facility);

free(syslog_priority);

}

static bool valid_user_field(const char *p, size_t l) {

const char *a;

/* We kinda enforce POSIX syntax recommendations for

/* No empty field names */

if (l <= 0)

return false;

/* Don't allow names longer than 64 chars */

if (l > 64)

return false;

/* Variables starting with an underscore are protected */

if (p[0] == '_')

return false;

/* Don't allow digits as first character */

if (p[0] >= '0' && p[0] <= '9')

return false;

/* Only allow A-Z0-9 and '_' */

for (a = p; a < p + l; a++)

if (!((*a >= 'A' && *a <= 'Z') ||

(*a >= '0' && *a <= '9') ||

*a == '_'))

return false;

return true;

}

static void process_native_message(Server *s, const void *buffer, size_t buffer_size, struct ucred *ucred, struct timeval *tv) {

struct iovec *iovec = NULL;

unsigned n = 0, m = 0, j;

const char *p;

size_t remaining;

int priority = LOG_INFO;

assert(s);

assert(buffer || n == 0);

p = buffer;

remaining = buffer_size;

while (remaining > 0) {

const char *e, *q;

e = memchr(p, '\n', remaining);

if (!e) {

/* Trailing noise, let's ignore it, and flush what we collected */

log_debug("Received message with trailing noise, ignoring.");

break;

}

if (e == p) {

/* Entry separator */

dispatch_message(s, iovec, n, m, ucred, tv, priority);

n = 0;

priority = LOG_INFO;

p++;

remaining--;

continue;

}

if (*p == '.' || *p == '#') {

/* Ignore control commands for now, and

remaining -= (e - p) + 1;

p = e + 1;

continue;

}

/* A property follows */

if (n+13 >= m) {

struct iovec *c;

unsigned u;

u = MAX((n+13U) * 2U, 4U);

c = realloc(iovec, u * sizeof(struct iovec));

if (!c) {

log_error("Out of memory");

break;

}

iovec = c;

m = u;

}

q = memchr(p, '=', e - p);

if (q) {

if (valid_user_field(p, q - p)) {

/* If the field name starts with an

iovec[n].iov_base = (char*) p;

iovec[n].iov_len = e - p;

n++;

/* We need to determine the priority

if (e - p == 10 &&

memcmp(p, "PRIORITY=", 10) == 0 &&

p[10] >= '0' &&

p[10] <= '9')

priority = p[10] - '0';

}

remaining -= (e - p) + 1;

p = e + 1;

continue;

} else {

uint64_t l;

char *k;

if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {

log_debug("Failed to parse message, ignoring.");

break;

}

memcpy(&l, e + 1, sizeof(uint64_t));

l = le64toh(l);

if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||

e[1+sizeof(uint64_t)+l] != '\n') {

log_debug("Failed to parse message, ignoring.");

break;

}

k = malloc((e - p) + 1 + l);

if (!k) {

log_error("Out of memory");

break;

}

memcpy(k, p, e - p);

k[e - p] = '=';

memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);

if (valid_user_field(p, e - p)) {

iovec[n].iov_base = k;

iovec[n].iov_len = (e - p) + 1 + l;

n++;

} else

free(k);

remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;

p = e + 1 + sizeof(uint64_t) + l + 1;

}

}

dispatch_message(s, iovec, n, m, ucred, tv, priority);

for (j = 0; j < n; j++)

if (iovec[j].iov_base < buffer ||

(const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)

free(iovec[j].iov_base);

}

static int stdout_stream_log(StdoutStream *s, const char *p, size_t l) {

struct iovec iovec[15];

char *message = NULL, *syslog_priority = NULL;

unsigned n = 0;

size_t tag_len;

int priority;

assert(s);

assert(p);

priority = s->priority;

if (s->priority_prefix &&

l > 3 &&

p[0] == '<' &&

p[1] >= '0' && p[1] <= '7' &&

p[2] == '>') {

priority = p[1] - '0';

p += 3;

l -= 3;

}

if (l <= 0)

return 0;

if (asprintf(&syslog_priority, "PRIORITY=%i", priority) >= 0)

IOVEC_SET_STRING(iovec[n++], syslog_priority);

tag_len = s->tag ? strlen(s->tag) + 2: 0;

message = malloc(8 + tag_len + l);

if (message) {

memcpy(message, "MESSAGE=", 8);

if (s->tag) {

memcpy(message+8, s->tag, tag_len-2);

memcpy(message+8+tag_len-2, ": ", 2);

}

memcpy(message+8+tag_len, p, l);

iovec[n].iov_base = message;

iovec[n].iov_len = 8+tag_len+l;

n++;

}

dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, priority);

if (s->tee_console) {

int console;

console = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);

if (console >= 0) {

n = 0;

if (s->tag) {

IOVEC_SET_STRING(iovec[n++], s->tag);

IOVEC_SET_STRING(iovec[n++], ": ");

}

iovec[n].iov_base = (void*) p;

iovec[n].iov_len = l;

n++;

IOVEC_SET_STRING(iovec[n++], (char*) "\n");

writev(console, iovec, n);

}

}

free(message);

free(syslog_priority);

return 0;

}

static int stdout_stream_line(StdoutStream *s, const char *p, size_t l) {

assert(s);

assert(p);

while (l > 0 && strchr(WHITESPACE, *p)) {

l--;

p++;

}

while (l > 0 && strchr(WHITESPACE, *(p+l-1)))

l--;

switch (s->state) {

case STDOUT_STREAM_TAG:

if (l > 0) {

s->tag = strndup(p, l);

if (!s->tag) {

log_error("Out of memory");

return -EINVAL;

}

}

s->state = STDOUT_STREAM_PRIORITY;

return 0;

case STDOUT_STREAM_PRIORITY:

if (l != 1 || *p < '0' || *p > '7') {

log_warning("Failed to parse log priority line.");

return -EINVAL;

}

s->priority = *p - '0';

s->state = STDOUT_STREAM_PRIORITY_PREFIX;

return 0;

case STDOUT_STREAM_PRIORITY_PREFIX:

if (l != 1 || *p < '0' || *p > '1') {

log_warning("Failed to parse priority prefix line.");

return -EINVAL;

}

s->priority_prefix = *p - '0';

s->state = STDOUT_STREAM_TEE_CONSOLE;

return 0;

case STDOUT_STREAM_TEE_CONSOLE:

if (l != 1 || *p < '0' || *p > '1') {

log_warning("Failed to parse tee to console line.");

return -EINVAL;

}

s->tee_console = *p - '0';

s->state = STDOUT_STREAM_RUNNING;

return 0;

case STDOUT_STREAM_RUNNING:

return stdout_stream_log(s, p, l);

}

assert_not_reached("Unknown stream state");

}

static int stdout_stream_scan(StdoutStream *s, bool force_flush) {

char *p;

size_t remaining;

int r;

assert(s);

p = s->buffer;

remaining = s->length;

for (;;) {

char *end;

size_t skip;

end = memchr(p, '\n', remaining);

if (!end) {

if (remaining >= LINE_MAX) {

end = p + LINE_MAX;

skip = LINE_MAX;

} else

break;

} else

skip = end - p + 1;

r = stdout_stream_line(s, p, end - p);

if (r < 0)

return r;

remaining -= skip;

p += skip;

}

if (force_flush && remaining > 0) {

r = stdout_stream_line(s, p, remaining);

if (r < 0)

return r;

p += remaining;

remaining = 0;

}

if (p > s->buffer) {

memmove(s->buffer, p, remaining);

s->length = remaining;

}

return 0;

}

static int stdout_stream_process(StdoutStream *s) {

ssize_t l;

int r;

assert(s);

l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);

if (l < 0) {

if (errno == EAGAIN)

return 0;

log_warning("Failed to read from stream: %m");

return -errno;

}

if (l == 0) {

r = stdout_stream_scan(s, true);

if (r < 0)

return r;

return 0;

}

s->length += l;

r = stdout_stream_scan(s, false);

if (r < 0)

return r;

return 1;

}

static void stdout_stream_free(StdoutStream *s) {

assert(s);

if (s->server) {

assert(s->server->n_stdout_streams > 0);

s->server->n_stdout_streams --;

LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);

}

if (s->fd >= 0) {

if (s->server)

epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);

close_nointr_nofail(s->fd);

}

free(s->tag);

free(s);

}

static int stdout_stream_new(Server *s) {

StdoutStream *stream;

int fd, r;

socklen_t len;

struct epoll_event ev;

assert(s);

fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);

if (fd < 0) {

if (errno == EAGAIN)

return 0;

log_error("Failed to accept stdout connection: %m");

return -errno;

}

if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {

log_warning("Too many stdout streams, refusing connection.");

close_nointr_nofail(fd);

return 0;

}

stream = new0(StdoutStream, 1);

if (!stream) {

log_error("Out of memory.");

close_nointr_nofail(fd);

return -ENOMEM;

}

stream->fd = fd;

len = sizeof(stream->ucred);

if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {

log_error("Failed to determine peer credentials: %m");

r = -errno;

goto fail;

}

if (shutdown(fd, SHUT_WR) < 0) {

log_error("Failed to shutdown writing side of socket: %m");

r = -errno;

goto fail;

}

zero(ev);

ev.data.ptr = stream;

ev.events = EPOLLIN;

if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {

log_error("Failed to add stream to event loop: %m");

r = -errno;

goto fail;

}

stream->server = s;

LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);

s->n_stdout_streams ++;

return 0;

fail:

stdout_stream_free(stream);

return r;

}

static int system_journal_open(Server *s) {

int r;

char *fn;

sd_id128_t machine;

char ids[33];

r = sd_id128_get_machine(&machine);

if (r < 0)

return r;

sd_id128_to_string(machine, ids);

if (!s->system_journal) {

/* First try to create the machine path, but not the prefix */

fn = strappend("/var/log/journal/", ids);

if (!fn)

return -ENOMEM;

(void) mkdir(fn, 0755);

free(fn);

/* The create the system journal file */

fn = join("/var/log/journal/", ids, "/system.journal", NULL);

if (!fn)

return -ENOMEM;

r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);

free(fn);

if (r >= 0) {

s->system_journal->metrics = s->metrics;

s->system_journal->compress = s->compress;

fix_perms(s->system_journal, 0);

} else if (r < 0) {

if (r == -ENOENT)

r = 0;

else {

log_error("Failed to open system journal: %s", strerror(-r));

return r;

}

}

}

if (!s->runtime_journal) {

fn = join("/run/log/journal/", ids, "/system.journal", NULL);

if (!fn)

return -ENOMEM;

if (s->system_journal) {

/* Try to open the runtime journal, but only

r = journal_file_open(fn, O_RDWR, 0640, NULL, &s->runtime_journal);

free(fn);

if (r < 0) {

if (r == -ENOENT)

r = 0;

else {

log_error("Failed to open runtime journal: %s", strerror(-r));

return r;

}

}

} else {

/* OK, we really need the runtime journal, so create

(void) mkdir_parents(fn, 0755);

r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);

free(fn);

if (r < 0) {

log_error("Failed to open runtime journal: %s", strerror(-r));

return r;

}

}

if (s->runtime_journal) {

s->runtime_journal->metrics = s->metrics;

s->runtime_journal->compress = s->compress;

fix_perms(s->runtime_journal, 0);

}

}

return r;

}

static int server_flush_to_var(Server *s) {

char path[] = "/run/log/journal/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

Object *o = NULL;

int r;

sd_id128_t machine;

sd_journal *j;

usec_t ts;

assert(s);

if (!s->runtime_journal)

return 0;

ts = now(CLOCK_MONOTONIC);

if (s->var_available_timestamp + RECHECK_VAR_AVAILABLE_USEC > ts)

return 0;

s->var_available_timestamp = ts;

system_journal_open(s);

if (!s->system_journal)

return 0;

r = sd_id128_get_machine(&machine);

if (r < 0) {

log_error("Failed to get machine id: %s", strerror(-r));

return r;

}

r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);

if (r < 0) {

log_error("Failed to read runtime journal: %s", strerror(-r));

return r;

}

SD_JOURNAL_FOREACH(j) {

JournalFile *f;

f = j->current_file;

assert(f && f->current_offset > 0);

r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);

if (r < 0) {

log_error("Can't read entry: %s", strerror(-r));

goto finish;

}

r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);

if (r == -E2BIG) {

log_info("Allocation limit reached.");

journal_file_post_change(s->system_journal);

server_vacuum(s);

r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);

}

if (r < 0) {

log_error("Can't write entry: %s", strerror(-r));

goto finish;

}

}

finish:

journal_file_post_change(s->system_journal);

journal_file_close(s->runtime_journal);

s->runtime_journal = NULL;

if (r >= 0) {

sd_id128_to_string(machine, path + 17);

rm_rf(path, false, true, false);

}

return r;

}

static void forward_syslog(Server *s, const void *buffer, size_t length, struct ucred *ucred, struct timeval *tv) {

struct msghdr msghdr;

struct iovec iovec;

struct cmsghdr *cmsg;

union {

struct cmsghdr cmsghdr;

uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +

CMSG_SPACE(sizeof(struct timeval))];

} control;

union sockaddr_union sa;

assert(s);

zero(msghdr);

zero(iovec);

iovec.iov_base = (void*) buffer;

iovec.iov_len = length;

msghdr.msg_iov = &iovec;

msghdr.msg_iovlen = 1;

zero(sa);

sa.un.sun_family = AF_UNIX;

strncpy(sa.un.sun_path, "/run/systemd/syslog", sizeof(sa.un.sun_path));

msghdr.msg_name = &sa;

msghdr.msg_namelen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path);

zero(control);

msghdr.msg_control = &control;

msghdr.msg_controllen = sizeof(control);

cmsg = CMSG_FIRSTHDR(&msghdr);

cmsg->cmsg_level = SOL_SOCKET;

cmsg->cmsg_type = SCM_CREDENTIALS;

cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));

memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred));

msghdr.msg_controllen = cmsg->cmsg_len;

/* Forward the syslog message we received via /dev/log to

if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)

return;

if (errno == ESRCH) {

struct ucred u;

/* Hmm, presumably the sender process vanished

u = *ucred;

u.pid = getpid();

memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred));

if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)

return;

}

log_debug("Failed to forward syslog message: %m");

}

static int process_event(Server *s, struct epoll_event *ev) {

assert(s);

if (ev->data.fd == s->signal_fd) {

struct signalfd_siginfo sfsi;

ssize_t n;

if (ev->events != EPOLLIN) {

log_info("Got invalid event from epoll.");

return -EIO;

}

n = read(s->signal_fd, &sfsi, sizeof(sfsi));

if (n != sizeof(sfsi)) {

if (n >= 0)

return -EIO;

if (errno == EINTR || errno == EAGAIN)

return 0;

return -errno;

}

if (sfsi.ssi_signo == SIGUSR1) {

server_flush_to_var(s);

return 0;

}

log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));

return 0;

} else if (ev->data.fd == s->native_fd ||

ev->data.fd == s->syslog_fd) {

if (ev->events != EPOLLIN) {

log_info("Got invalid event from epoll.");

return -EIO;

}

for (;;) {

struct msghdr msghdr;

struct iovec iovec;

struct ucred *ucred = NULL;

struct timeval *tv = NULL;

struct cmsghdr *cmsg;

union {

struct cmsghdr cmsghdr;

uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +

CMSG_SPACE(sizeof(struct timeval))];