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 "common.h"
23 #include "log.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 #if defined(_HF_ARCH_LINUX)
40 #include <sys/syscall.h>
41 #define __hf_pid() (pid_t) syscall(__NR_gettid)
42 #else /* defined(_HF_ARCH_LINUX) */
43 #define __hf_pid() getpid()
44 #endif /* defined(_HF_ARCH_LINUX) */
45
46 static int log_fd;
47 static bool log_fd_isatty;
48 enum llevel_t log_level;
49 pthread_mutex_t log_mutex = PTHREAD_MUTEX_INITIALIZER;
50
51 __attribute__ ((constructor))
log_init(void)52 static void log_init(void)
53 {
54 log_level = INFO;
55 log_fd = dup(STDERR_FILENO);
56 fcntl(log_fd, F_SETFD, O_CLOEXEC);
57 log_fd_isatty = isatty(log_fd);
58 }
59
60 /*
61 * Log to stderr by default. Use a dup()d fd, because in the future we'll associate the
62 * connection socket with fd (0, 1, 2).
63 */
logInitLogFile(const char * logfile,enum llevel_t ll)64 bool logInitLogFile(const char *logfile, enum llevel_t ll)
65 {
66 log_level = ll;
67
68 if (logfile == NULL) {
69 return true;
70 }
71
72 log_fd = open(logfile, O_CREAT | O_RDWR | O_APPEND, 0640);
73 if (log_fd == -1) {
74 log_fd = STDERR_FILENO;
75 PLOG_E("Couldn't open logfile open('%s')", logfile);
76 return false;
77 }
78 log_fd_isatty = (isatty(log_fd) == 1 ? true : false);
79 return true;
80 }
81
logLog(enum llevel_t ll,const char * fn,int ln,bool perr,const char * fmt,...)82 void logLog(enum llevel_t ll, const char *fn, int ln, bool perr, const char *fmt, ...)
83 {
84 char strerr[512];
85 if (perr == true) {
86 snprintf(strerr, sizeof(strerr), "%s", strerror(errno));
87 }
88 struct ll_t {
89 char *descr;
90 char *prefix;
91 bool print_funcline;
92 };
93 struct ll_t logLevels[] = {
94 {"F", "\033[7;35m", true},
95 {"E", "\033[1;31m", true},
96 {"W", "\033[0;33m", true},
97 {"I", "\033[1m", true},
98 {"D", "\033[0;4m", true},
99 {"HR", "\033[0m", false},
100 {"HB", "\033[1m", false},
101 };
102
103 time_t ltstamp = time(NULL);
104 struct tm utctime;
105 localtime_r(<stamp, &utctime);
106 char timestr[32];
107 if (strftime(timestr, sizeof(timestr) - 1, "%FT%T%z", &utctime) == 0) {
108 timestr[0] = '\0';
109 }
110
111 /* Start printing logs */
112 {
113 pthread_mutex_lock(&log_mutex);
114 DEFER(pthread_mutex_unlock(&log_mutex));
115
116 if (log_fd_isatty) {
117 dprintf(log_fd, "%s", logLevels[ll].prefix);
118 }
119 if (logLevels[ll].print_funcline) {
120 dprintf(log_fd, "[%s][%s][%d] %s():%d ", timestr, logLevels[ll].descr, __hf_pid(), fn,
121 ln);
122 }
123
124 va_list args;
125 va_start(args, fmt);
126 vdprintf(log_fd, fmt, args);
127 va_end(args);
128
129 if (perr == true) {
130 dprintf(log_fd, ": %s", strerr);
131 }
132 if (log_fd_isatty) {
133 dprintf(log_fd, "\033[0m");
134 }
135 dprintf(log_fd, "\n");
136 }
137 /* End printing logs */
138
139 if (ll == FATAL) {
140 exit(1);
141 }
142 }
143
logStop(int sig)144 void logStop(int sig)
145 {
146 LOG_I("Server stops due to fatal signal (%d) caught. Exiting", sig);
147 }
148
logRedirectLogFD(int fd)149 void logRedirectLogFD(int fd)
150 {
151 log_fd = fd;
152 }
153
logDirectlyToFD(const char * msg)154 void logDirectlyToFD(const char *msg)
155 {
156 dprintf(log_fd, "%s", msg);
157 }
158