+++ /dev/null
-/*-*- 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 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 <unistd.h>
-#include <stddef.h>
-#include <sys/epoll.h>
-
-#include "systemd/sd-messages.h"
-#include "socket-util.h"
-#include "selinux-util.h"
-#include "journald-server.h"
-#include "journald-syslog.h"
-#include "journald-kmsg.h"
-#include "journald-console.h"
-#include "journald-wall.h"
-
-/* Warn once every 30s if we missed syslog message */
-#define WARN_FORWARD_SYSLOG_MISSED_USEC (30 * USEC_PER_SEC)
-
-static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, const struct ucred *ucred, const struct timeval *tv) {
-
- static const union sockaddr_union sa = {
- .un.sun_family = AF_UNIX,
- .un.sun_path = "/run/systemd/journal/syslog",
- };
- struct msghdr msghdr = {
- .msg_iov = (struct iovec *) iovec,
- .msg_iovlen = n_iovec,
- .msg_name = (struct sockaddr*) &sa.sa,
- .msg_namelen = offsetof(union sockaddr_union, un.sun_path)
- + strlen("/run/systemd/journal/syslog"),
- };
- struct cmsghdr *cmsg;
- union {
- struct cmsghdr cmsghdr;
- uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
- } control;
-
- assert(s);
- assert(iovec);
- assert(n_iovec > 0);
-
- if (ucred) {
- 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
- * /run/systemd/syslog. Unfortunately we currently can't set
- * the SO_TIMESTAMP auxiliary data, and hence we don't. */
-
- if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
- return;
-
- /* The socket is full? I guess the syslog implementation is
- * too slow, and we shouldn't wait for that... */
- if (errno == EAGAIN) {
- s->n_forward_syslog_missed++;
- return;
- }
-
- if (ucred && (errno == ESRCH || errno == EPERM)) {
- struct ucred u;
-
- /* Hmm, presumably the sender process vanished
- * by now, or we don't have CAP_SYS_AMDIN, so
- * let's fix it as good as we can, and retry */
-
- u = *ucred;
- u.pid = getpid();
- memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred));
-
- if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
- return;
-
- if (errno == EAGAIN) {
- s->n_forward_syslog_missed++;
- return;
- }
- }
-
- if (errno != ENOENT)
- log_debug_errno(errno, "Failed to forward syslog message: %m");
-}
-
-static void forward_syslog_raw(Server *s, int priority, const char *buffer, const struct ucred *ucred, const struct timeval *tv) {
- struct iovec iovec;
-
- assert(s);
- assert(buffer);
-
- if (LOG_PRI(priority) > s->max_level_syslog)
- return;
-
- IOVEC_SET_STRING(iovec, buffer);
- forward_syslog_iovec(s, &iovec, 1, ucred, tv);
-}
-
-void server_forward_syslog(Server *s, int priority, const char *identifier, const char *message, const struct ucred *ucred, const struct timeval *tv) {
- struct iovec iovec[5];
- char header_priority[DECIMAL_STR_MAX(priority) + 3], header_time[64],
- header_pid[sizeof("[]: ")-1 + DECIMAL_STR_MAX(pid_t) + 1];
- int n = 0;
- time_t t;
- struct tm *tm;
- char *ident_buf = NULL;
-
- assert(s);
- assert(priority >= 0);
- assert(priority <= 999);
- assert(message);
-
- if (LOG_PRI(priority) > s->max_level_syslog)
- return;
-
- /* First: priority field */
- xsprintf(header_priority, "<%i>", priority);
- IOVEC_SET_STRING(iovec[n++], header_priority);
-
- /* Second: timestamp */
- t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC));
- tm = localtime(&t);
- if (!tm)
- return;
- if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
- return;
- IOVEC_SET_STRING(iovec[n++], header_time);
-
- /* Third: identifier and PID */
- if (ucred) {
- if (!identifier) {
- get_process_comm(ucred->pid, &ident_buf);
- identifier = ident_buf;
- }
-
- xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid);
-
- if (identifier)
- IOVEC_SET_STRING(iovec[n++], identifier);
-
- IOVEC_SET_STRING(iovec[n++], header_pid);
- } else if (identifier) {
- IOVEC_SET_STRING(iovec[n++], identifier);
- IOVEC_SET_STRING(iovec[n++], ": ");
- }
-
- /* Fourth: message */
- IOVEC_SET_STRING(iovec[n++], message);
-
- forward_syslog_iovec(s, iovec, n, ucred, tv);
-
- free(ident_buf);
-}
-
-int syslog_fixup_facility(int priority) {
-
- if ((priority & LOG_FACMASK) == 0)
- return (priority & LOG_PRIMASK) | LOG_USER;
-
- return priority;
-}
-
-size_t syslog_parse_identifier(const char **buf, char **identifier, char **pid) {
- const char *p;
- char *t;
- size_t l, e;
-
- assert(buf);
- assert(identifier);
- assert(pid);
-
- p = *buf;
-
- p += strspn(p, WHITESPACE);
- l = strcspn(p, WHITESPACE);
-
- if (l <= 0 ||
- p[l-1] != ':')
- return 0;
-
- e = l;
- l--;
-
- if (p[l-1] == ']') {
- size_t k = l-1;
-
- for (;;) {
-
- if (p[k] == '[') {
- t = strndup(p+k+1, l-k-2);
- if (t)
- *pid = t;
-
- l = k;
- break;
- }
-
- if (k == 0)
- break;
-
- k--;
- }
- }
-
- t = strndup(p, l);
- if (t)
- *identifier = t;
-
- e += strspn(p + e, WHITESPACE);
- *buf = p + e;
- return e;
-}
-
-static void syslog_skip_date(char **buf) {
- enum {
- LETTER,
- SPACE,
- NUMBER,
- SPACE_OR_NUMBER,
- COLON
- } sequence[] = {
- LETTER, LETTER, LETTER,
- SPACE,
- SPACE_OR_NUMBER, NUMBER,
- SPACE,
- SPACE_OR_NUMBER, NUMBER,
- COLON,
- SPACE_OR_NUMBER, NUMBER,
- COLON,
- SPACE_OR_NUMBER, NUMBER,
- SPACE
- };
-
- char *p;
- unsigned i;
-
- assert(buf);
- assert(*buf);
-
- p = *buf;
-
- for (i = 0; i < ELEMENTSOF(sequence); i++, p++) {
-
- if (!*p)
- return;
-
- switch (sequence[i]) {
-
- case SPACE:
- if (*p != ' ')
- return;
- break;
-
- case SPACE_OR_NUMBER:
- if (*p == ' ')
- break;
-
- /* fall through */
-
- case NUMBER:
- if (*p < '0' || *p > '9')
- return;
-
- break;
-
- case LETTER:
- if (!(*p >= 'A' && *p <= 'Z') &&
- !(*p >= 'a' && *p <= 'z'))
- return;
-
- break;
-
- case COLON:
- if (*p != ':')
- return;
- break;
-
- }
- }
-
- *buf = p;
-}
-
-void server_process_syslog_message(
- Server *s,
- const char *buf,
- const struct ucred *ucred,
- const struct timeval *tv,
- const char *label,
- size_t label_len) {
-
- char syslog_priority[sizeof("PRIORITY=") + DECIMAL_STR_MAX(int)],
- syslog_facility[sizeof("SYSLOG_FACILITY") + DECIMAL_STR_MAX(int)];
- const char *message = NULL, *syslog_identifier = NULL, *syslog_pid = NULL;
- struct iovec iovec[N_IOVEC_META_FIELDS + 6];
- unsigned n = 0;
- int priority = LOG_USER | LOG_INFO;
- _cleanup_free_ char *identifier = NULL, *pid = NULL;
- const char *orig;
-
- assert(s);
- assert(buf);
-
- orig = buf;
- syslog_parse_priority(&buf, &priority, true);
-
- if (s->forward_to_syslog)
- forward_syslog_raw(s, priority, orig, ucred, tv);
-
- syslog_skip_date((char**) &buf);
- syslog_parse_identifier(&buf, &identifier, &pid);
-
- if (s->forward_to_kmsg)
- server_forward_kmsg(s, priority, identifier, buf, ucred);
-
- if (s->forward_to_console)
- server_forward_console(s, priority, identifier, buf, ucred);
-
- if (s->forward_to_wall)
- server_forward_wall(s, priority, identifier, buf, ucred);
-
- IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog");
-
- sprintf(syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK);
- IOVEC_SET_STRING(iovec[n++], syslog_priority);
-
- if (priority & LOG_FACMASK) {
- sprintf(syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority));
- IOVEC_SET_STRING(iovec[n++], syslog_facility);
- }
-
- if (identifier) {
- syslog_identifier = strjoina("SYSLOG_IDENTIFIER=", identifier);
- if (syslog_identifier)
- IOVEC_SET_STRING(iovec[n++], syslog_identifier);
- }
-
- if (pid) {
- syslog_pid = strjoina("SYSLOG_PID=", pid);
- if (syslog_pid)
- IOVEC_SET_STRING(iovec[n++], syslog_pid);
- }
-
- message = strjoina("MESSAGE=", buf);
- if (message)
- IOVEC_SET_STRING(iovec[n++], message);
-
- server_dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, NULL, priority, 0);
-}
-
-int server_open_syslog_socket(Server *s) {
- static const int one = 1;
- int r;
-
- assert(s);
-
- if (s->syslog_fd < 0) {
- static const union sockaddr_union sa = {
- .un.sun_family = AF_UNIX,
- .un.sun_path = "/run/systemd/journal/dev-log",
- };
-
- s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (s->syslog_fd < 0)
- return log_error_errno(errno, "socket() failed: %m");
-
- unlink(sa.un.sun_path);
-
- r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
- if (r < 0)
- return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
-
- chmod(sa.un.sun_path, 0666);
- } else
- fd_nonblock(s->syslog_fd, 1);
-
- r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
- if (r < 0)
- return log_error_errno(errno, "SO_PASSCRED failed: %m");
-
-#ifdef HAVE_SELINUX
- if (mac_selinux_use()) {
- r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
- if (r < 0)
- log_warning_errno(errno, "SO_PASSSEC failed: %m");
- }
-#endif
-
- r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
- if (r < 0)
- return log_error_errno(errno, "SO_TIMESTAMP failed: %m");
-
- r = sd_event_add_io(s->event, &s->syslog_event_source, s->syslog_fd, EPOLLIN, server_process_datagram, s);
- if (r < 0)
- return log_error_errno(r, "Failed to add syslog server fd to event loop: %m");
-
- return 0;
-}
-
-void server_maybe_warn_forward_syslog_missed(Server *s) {
- usec_t n;
- assert(s);
-
- if (s->n_forward_syslog_missed <= 0)
- return;
-
- n = now(CLOCK_MONOTONIC);
- if (s->last_warn_forward_syslog_missed + WARN_FORWARD_SYSLOG_MISSED_USEC > n)
- return;
-
- server_driver_message(s, SD_MESSAGE_FORWARD_SYSLOG_MISSED, "Forwarding to syslog missed %u messages.", s->n_forward_syslog_missed);
-
- s->n_forward_syslog_missed = 0;
- s->last_warn_forward_syslog_missed = n;
-}
~ianmdlvl / elogind.git / blobdiff