c55dc8cb12
In some situations, setting --log to /proc/self/fd/# is not sufficient to log out to a different FD. For instance, if a master process passes its stderr to the child nsjail process as fd 3, the nsjail child may not always be able to log to /proc/self/fd/3, e.g. if the master process is running under systemd, whose /proc/self/fd/2 is actually a socket and not a pipe. However, having nsjail write to fd 3 directly is fine and there's no other good way to handle this situation.
141 lines
3.4 KiB
C
141 lines
3.4 KiB
C
/*
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nsjail - logging
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-----------------------------------------
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Copyright 2014 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "log.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/syscall.h>
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#include <time.h>
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#include <unistd.h>
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static int log_fd = STDERR_FILENO;
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static bool log_fd_isatty = true;
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static enum llevel_t log_level = INFO;
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#define _LOG_DEFAULT_FILE "/var/log/nsjail.log"
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/*
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* Log to stderr by default. Use a dup()d fd, because in the future we'll associate the
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* connection socket with fd (0, 1, 2).
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*/
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bool logInitLogFile(struct nsjconf_t *nsjconf)
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{
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/* Close previous log_fd */
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if (log_fd > STDERR_FILENO) {
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close(log_fd);
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log_fd = STDERR_FILENO;
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}
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log_fd = nsjconf->log_fd;
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log_level = nsjconf->loglevel;
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if (nsjconf->logfile == NULL && nsjconf->daemonize == true) {
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nsjconf->logfile = _LOG_DEFAULT_FILE;
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}
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if (nsjconf->logfile == NULL) {
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log_fd = fcntl(log_fd, F_DUPFD_CLOEXEC, 0);
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} else {
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if (TEMP_FAILURE_RETRY
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(log_fd = open(nsjconf->logfile, O_CREAT | O_RDWR | O_APPEND, 0640)) == -1) {
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log_fd = STDERR_FILENO;
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PLOG_E("Couldn't open logfile open('%s')", nsjconf->logfile);
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return false;
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}
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}
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log_fd_isatty = (isatty(log_fd) == 1 ? true : false);
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return true;
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}
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void logLog(enum llevel_t ll, const char *fn, int ln, bool perr, const char *fmt, ...)
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{
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if (ll < log_level) {
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return;
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}
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char strerr[512];
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if (perr == true) {
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snprintf(strerr, sizeof(strerr), "%s", strerror(errno));
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}
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struct ll_t {
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const char *const descr;
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const char *const prefix;
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const bool print_funcline;
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const bool print_time;
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};
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static struct ll_t const logLevels[] = {
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{"D", "\033[0;4m", true, true},
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{"I", "\033[1m", false, true},
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{"W", "\033[0;33m", true, true},
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{"E", "\033[1;31m", true, true},
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{"F", "\033[7;35m", true, true},
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{"HR", "\033[0m", false, false},
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{"HB", "\033[1m", false, false},
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};
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time_t ltstamp = time(NULL);
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struct tm utctime;
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localtime_r(<stamp, &utctime);
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char timestr[32];
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if (strftime(timestr, sizeof(timestr) - 1, "%FT%T%z", &utctime) == 0) {
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timestr[0] = '\0';
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}
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/* Start printing logs */
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if (log_fd_isatty) {
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dprintf(log_fd, "%s", logLevels[ll].prefix);
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}
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if (logLevels[ll].print_time) {
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dprintf(log_fd, "[%s] ", timestr);
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}
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if (logLevels[ll].print_funcline) {
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dprintf(log_fd, "[%s][%d] %s():%d ", logLevels[ll].descr, (int)getpid(), fn, ln);
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}
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va_list args;
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va_start(args, fmt);
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vdprintf(log_fd, fmt, args);
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va_end(args);
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if (perr == true) {
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dprintf(log_fd, ": %s", strerr);
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}
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if (log_fd_isatty) {
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dprintf(log_fd, "\033[0m");
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}
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dprintf(log_fd, "\n");
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/* End printing logs */
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if (ll == FATAL) {
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exit(1);
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}
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}
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void logStop(int sig)
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{
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LOG_I("Server stops due to fatal signal (%d) caught. Exiting", sig);
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}
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