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
log_init(void)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 */
logInitLogFile(const char * logfile,enum llevel_t ll)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
logLog(enum llevel_t ll,const char * fn,int ln,bool perr,const char * fmt,...)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(<stamp, &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
logStop(int sig)148 void logStop(int sig) { LOG_I("Server stops due to fatal signal (%d) caught. Exiting", sig); }
149
logRedirectLogFD(int fd)150 void logRedirectLogFD(int fd) { log_fd = fd; }
151
logDirectlyToFD(const char * msg)152 void logDirectlyToFD(const char* msg) { dprintf(log_fd, "%s", msg); }
153
logMutexGet(void)154 pthread_mutex_t* logMutexGet(void) { return &log_mutex; }
155
logMutexReset(void)156 void logMutexReset(void) { pthread_mutex_init(&log_mutex, NULL); }
157
logIsTTY(void)158 bool logIsTTY(void) { return log_fd_isatty; }
159
logFd(void)160 int logFd(void) { return log_fd; }
161