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      1 /*
      2 
      3    nsjail - logging
      4    -----------------------------------------
      5 
      6    Copyright 2014 Google Inc. All Rights Reserved.
      7 
      8    Licensed under the Apache License, Version 2.0 (the "License");
      9    you may not use this file except in compliance with the License.
     10    You may obtain a copy of the License at
     11 
     12      http://www.apache.org/licenses/LICENSE-2.0
     13 
     14    Unless required by applicable law or agreed to in writing, software
     15    distributed under the License is distributed on an "AS IS" BASIS,
     16    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     17    See the License for the specific language governing permissions and
     18    limitations under the License.
     19 
     20 */
     21 
     22 #include "log.h"
     23 #include "common.h"
     24 
     25 #include <errno.h>
     26 #include <fcntl.h>
     27 #include <getopt.h>
     28 #include <limits.h>
     29 #include <pthread.h>
     30 #include <stdarg.h>
     31 #include <stdio.h>
     32 #include <stdlib.h>
     33 #include <string.h>
     34 #include <sys/stat.h>
     35 #include <sys/types.h>
     36 #include <time.h>
     37 #include <unistd.h>
     38 
     39 #include "util.h"
     40 
     41 #if defined(_HF_ARCH_LINUX)
     42 #include <sys/syscall.h>
     43 #define __hf_pid() (pid_t) syscall(__NR_gettid)
     44 #else /* defined(_HF_ARCH_LINUX) */
     45 #define __hf_pid() getpid()
     46 #endif /* defined(_HF_ARCH_LINUX) */
     47 
     48 static int log_fd = STDERR_FILENO;
     49 static bool log_fd_isatty = false;
     50 enum llevel_t log_level = INFO;
     51 static pthread_mutex_t log_mutex = PTHREAD_MUTEX_INITIALIZER;
     52 
     53 __attribute__((constructor)) static void log_init(void) {
     54     log_level = INFO;
     55     log_fd = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 0);
     56     if (log_fd == -1) {
     57         log_fd = STDERR_FILENO;
     58     }
     59     log_fd_isatty = isatty(log_fd);
     60 }
     61 
     62 /*
     63  * Log to stderr by default. Use a dup()d fd, because in the future we'll associate the
     64  * connection socket with fd (0, 1, 2).
     65  */
     66 bool logInitLogFile(const char* logfile, enum llevel_t ll) {
     67     log_level = ll;
     68 
     69     if (logfile == NULL) {
     70         return true;
     71     }
     72 
     73     log_fd = open(logfile, O_CREAT | O_RDWR | O_APPEND, 0640);
     74     if (log_fd == -1) {
     75         log_fd = STDERR_FILENO;
     76         PLOG_E("Couldn't open logfile open('%s')", logfile);
     77         return false;
     78     }
     79     log_fd_isatty = (isatty(log_fd) == 1 ? true : false);
     80     return true;
     81 }
     82 
     83 void logLog(enum llevel_t ll, const char* fn, int ln, bool perr, const char* fmt, ...) {
     84     char strerr[512];
     85     if (perr == true) {
     86         snprintf(strerr, sizeof(strerr), "%s", strerror(errno));
     87     }
     88     struct ll_t {
     89         const char* descr;
     90         const char* prefix;
     91         const bool print_funcline;
     92         const bool print_time;
     93     };
     94     static const struct ll_t logLevels[] = {
     95         {"F", "\033[7;35m", true, true},
     96         {"E", "\033[1;31m", true, true},
     97         {"W", "\033[0;33m", true, true},
     98         {"I", "\033[1m", false, false},
     99         {"D", "\033[0;4m", true, true},
    100         {"HR", "\033[0m", false, false},
    101         {"HB", "\033[1m", false, false},
    102     };
    103 
    104     time_t ltstamp = time(NULL);
    105     struct tm utctime;
    106     localtime_r(&ltstamp, &utctime);
    107     char timestr[32];
    108     if (strftime(timestr, sizeof(timestr) - 1, "%FT%T%z", &utctime) == 0) {
    109         timestr[0] = '\0';
    110     }
    111 
    112     /* Start printing logs */
    113     {
    114         MX_LOCK(&log_mutex);
    115 
    116         if (log_fd_isatty) {
    117             dprintf(log_fd, "%s", logLevels[ll].prefix);
    118         }
    119         if (logLevels[ll].print_time) {
    120             dprintf(log_fd, "[%s][%s][%d] ", timestr, logLevels[ll].descr, __hf_pid());
    121         }
    122         if (logLevels[ll].print_funcline) {
    123             dprintf(log_fd, "%s():%d ", fn, ln);
    124         }
    125 
    126         va_list args;
    127         va_start(args, fmt);
    128         vdprintf(log_fd, fmt, args);
    129         va_end(args);
    130 
    131         if (perr == true) {
    132             dprintf(log_fd, ": %s", strerr);
    133         }
    134         if (log_fd_isatty) {
    135             dprintf(log_fd, "\033[0m");
    136         }
    137         dprintf(log_fd, "\n");
    138 
    139         MX_UNLOCK(&log_mutex);
    140     }
    141     /* End printing logs */
    142 
    143     if (ll == FATAL) {
    144         exit(1);
    145     }
    146 }
    147 
    148 void logStop(int sig) { LOG_I("Server stops due to fatal signal (%d) caught. Exiting", sig); }
    149 
    150 void logRedirectLogFD(int fd) { log_fd = fd; }
    151 
    152 void logDirectlyToFD(const char* msg) { dprintf(log_fd, "%s", msg); }
    153 
    154 pthread_mutex_t* logMutexGet(void) { return &log_mutex; }
    155 
    156 void logMutexReset(void) { pthread_mutex_init(&log_mutex, NULL); }
    157 
    158 bool logIsTTY(void) { return log_fd_isatty; }
    159 
    160 int logFd(void) { return log_fd; }
    161