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-rw-r--r--src/journal/journald.c460
1 files changed, 460 insertions, 0 deletions
diff --git a/src/journal/journald.c b/src/journal/journald.c
new file mode 100644
index 0000000000..9297ca6fb7
--- /dev/null
+++ b/src/journal/journald.c
@@ -0,0 +1,460 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2011 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/epoll.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <sys/signalfd.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "hashmap.h"
+#include "journal-private.h"
+#include "sd-daemon.h"
+#include "socket-util.h"
+
+typedef struct Server {
+ int syslog_fd;
+ int epoll_fd;
+ int signal_fd;
+
+ JournalFile *system_journal;
+ Hashmap *user_journals;
+} Server;
+
+static void process_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {
+ char *message = NULL, *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,
+ *syslog_priority = NULL, *syslog_facility = NULL,
+ *exe = NULL;
+ dual_timestamp ts;
+ struct iovec iovec[15];
+ unsigned n = 0;
+ char idbuf[33];
+ sd_id128_t id;
+ int r;
+ char *t;
+ int priority = LOG_USER | LOG_INFO;
+
+ dual_timestamp_get(&ts);
+
+ 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);
+
+ if (ucred) {
+ uint32_t session;
+ uid_t loginuid;
+
+ 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);
+ }
+
+ if (tv) {
+ if (asprintf(&source_time, "SOURCE_REALTIME_TIMESTAMP=%llu",
+ (unsigned long long) timeval_load(tv)) >= 0)
+ IOVEC_SET_STRING(iovec[n++], source_time);
+ }
+
+ 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);
+ }
+
+ r = journal_file_append_entry(s->system_journal, &ts, iovec, n, NULL, NULL);
+ if (r < 0)
+ log_error("Failed to write entry: %s", strerror(-r));
+
+
+ free(message);
+ free(pid);
+ free(uid);
+ free(gid);
+ free(comm);
+ free(cmdline);
+ free(source_time);
+ free(boot_id);
+ free(machine_id);
+ free(hostname);
+ free(audit_session);
+ free(audit_loginuid);
+ free(syslog_facility);
+ free(syslog_priority);
+}
+
+static int process_event(Server *s, struct epoll_event *ev) {
+ assert(s);
+
+ if (ev->events != EPOLLIN) {
+ log_info("Got invalid event from epoll.");
+ return -EIO;
+ }
+
+ if (ev->data.fd == s->signal_fd) {
+ struct signalfd_siginfo sfsi;
+ ssize_t n;
+
+ 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;
+ }
+
+ log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
+ return 0;
+
+ } else {
+ for (;;) {
+ char buf[LINE_MAX+1];
+ 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))];
+ } control;
+ ssize_t n;
+ char *e;
+
+ zero(iovec);
+ iovec.iov_base = buf;
+ iovec.iov_len = sizeof(buf)-1;
+
+ zero(control);
+ zero(msghdr);
+ msghdr.msg_iov = &iovec;
+ msghdr.msg_iovlen = 1;
+ msghdr.msg_control = &control;
+ msghdr.msg_controllen = sizeof(control);
+
+ n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT);
+ if (n < 0) {
+
+ if (errno == EINTR || errno == EAGAIN)
+ return 1;
+
+ log_error("recvmsg() failed: %m");
+ return -errno;
+ }
+
+ for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
+
+ if (cmsg->cmsg_level == SOL_SOCKET &&
+ cmsg->cmsg_type == SCM_CREDENTIALS &&
+ cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
+ ucred = (struct ucred*) CMSG_DATA(cmsg);
+ else if (cmsg->cmsg_level == SOL_SOCKET &&
+ cmsg->cmsg_type == SO_TIMESTAMP &&
+ cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
+ tv = (struct timeval*) CMSG_DATA(cmsg);
+ }
+
+ e = memchr(buf, '\n', n);
+ if (e)
+ *e = 0;
+ else
+ buf[n] = 0;
+
+ process_message(s, strstrip(buf), ucred, tv);
+ }
+ }
+
+ return 1;
+}
+
+
+static int open_system_journal(JournalFile **f) {
+ int r;
+
+ r = journal_file_open(NULL, "/var/log/journal/system.journal", O_RDWR|O_CREAT, 0644, f);
+ if (r == -ENOENT) {
+ mkdir_p("/run/log/journal", 0755);
+
+ r = journal_file_open(NULL, "/run/log/journal/system.journal", O_RDWR|O_CREAT, 0644, f);
+ }
+
+ return r;
+}
+
+static int server_init(Server *s) {
+ int n, one, r;
+ struct epoll_event ev;
+ sigset_t mask;
+
+ assert(s);
+
+ zero(*s);
+ s->syslog_fd = s->signal_fd = -1;
+
+ s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
+ if (s->epoll_fd < 0) {
+ log_error("Failed to create epoll object: %m");
+ return -errno;
+ }
+
+ n = sd_listen_fds(true);
+ if (n < 0) {
+ log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
+ return n;
+ }
+
+ if (n > 1) {
+ log_error("Too many file descriptors passed.");
+ return -EINVAL;
+ }
+
+ if (n == 1)
+ s->syslog_fd = SD_LISTEN_FDS_START;
+ else {
+ union sockaddr_union sa;
+
+ s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
+ if (s->syslog_fd < 0) {
+ log_error("socket() failed: %m");
+ return -errno;
+ }
+
+ zero(sa);
+ sa.un.sun_family = AF_UNIX;
+ strncpy(sa.un.sun_path, "/run/systemd/syslog", sizeof(sa.un.sun_path));
+
+ unlink(sa.un.sun_path);
+
+ r = bind(s->syslog_fd, &sa.sa, sizeof(sa.un));
+ if (r < 0) {
+ log_error("bind() failed: %m");
+ return -errno;
+ }
+
+ chmod(sa.un.sun_path, 0666);
+ }
+
+ one = 1;
+ r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
+ if (r < 0) {
+ log_error("SO_PASSCRED failed: %m");
+ return -errno;
+ }
+
+ one = 1;
+ r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
+ if (r < 0) {
+ log_error("SO_TIMESTAMP failed: %m");
+ return -errno;
+ }
+
+ zero(ev);
+ ev.events = EPOLLIN;
+ ev.data.fd = s->syslog_fd;
+ if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
+ log_error("Failed to add server fd to epoll object: %m");
+ return -errno;
+ }
+
+ s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
+ if (!s->user_journals) {
+ log_error("Out of memory.");
+ return -ENOMEM;
+ }
+
+ r = open_system_journal(&s->system_journal);
+ if (r < 0) {
+ log_error("Failed to open journal: %s", strerror(-r));
+ return r;
+ }
+
+ assert_se(sigemptyset(&mask) == 0);
+ sigset_add_many(&mask, SIGINT, SIGTERM, -1);
+ assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
+
+ s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
+ if (s->signal_fd < 0) {
+ log_error("signalfd(): %m");
+ return -errno;
+ }
+
+ zero(ev);
+ ev.events = EPOLLIN;
+ ev.data.fd = s->signal_fd;
+
+ if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
+ log_error("epoll_ctl(): %m");
+ return -errno;
+ }
+
+ return 0;
+}
+
+static void server_done(Server *s) {
+ JournalFile *f;
+ assert(s);
+
+ if (s->system_journal)
+ journal_file_close(s->system_journal);
+
+ while ((f = hashmap_steal_first(s->user_journals)))
+ journal_file_close(f);
+
+ hashmap_free(s->user_journals);
+
+ if (s->epoll_fd >= 0)
+ close_nointr_nofail(s->epoll_fd);
+
+ if (s->signal_fd >= 0)
+ close_nointr_nofail(s->signal_fd);
+
+ if (s->syslog_fd >= 0)
+ close_nointr_nofail(s->syslog_fd);
+}
+
+int main(int argc, char *argv[]) {
+ Server server;
+ int r;
+
+ /* if (getppid() != 1) { */
+ /* log_error("This program should be invoked by init only."); */
+ /* return EXIT_FAILURE; */
+ /* } */
+
+ if (argc > 1) {
+ log_error("This program does not take arguments.");
+ return EXIT_FAILURE;
+ }
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ r = server_init(&server);
+ if (r < 0)
+ goto finish;
+
+ log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
+
+ sd_notify(false,
+ "READY=1\n"
+ "STATUS=Processing messages...");
+
+ for (;;) {
+ struct epoll_event event;
+
+ r = epoll_wait(server.epoll_fd, &event, 1, -1);
+ if (r < 0) {
+
+ if (errno == EINTR)
+ continue;
+
+ log_error("epoll_wait() failed: %m");
+ r = -errno;
+ goto finish;
+ } else if (r == 0)
+ break;
+
+ r = process_event(&server, &event);
+ if (r < 0)
+ goto finish;
+ else if (r == 0)
+ break;
+ }
+
+finish:
+ sd_notify(false,
+ "STATUS=Shutting down...");
+
+ server_done(&server);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-23 00:30:27 +0000