容器化的无污染DNS服务
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#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "logger.h"
int LOG_LEVEL = LOG_INFO; // default log level
static const char *log_string[] = {
"[DEBUG]",
"[INFO]",
"[WARN]",
"[ERROR]",
"[FATAL]",
};
static const char *log_color[] = {
"\x1b[39m", // debug
"\x1b[32m", // info
"\x1b[33m", // warn
"\x1b[31m", // error
"\x1b[95m", // fatal
};
void log_printf(int level, const char *fmt, ...) {
if (level < LOG_LEVEL) { // skip low log level
return;
}
time_t t = time(NULL);
char time_str[20]; // YYYY-mm-dd HH:MM:SS (20 bytes)
time_str[strftime(time_str, 20, "%Y-%m-%d %H:%M:%S", localtime(&t))] = '\0'; // generate time str
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "\x1b[36m[ClearDNS]\x1b[0m \x1b[90m%s\x1b[0m", time_str); // show log prefix
fprintf(stderr, " %s%s\x1b[0m ", log_color[level], log_string[level]); // show log level
vfprintf(stderr, fmt, ap); // output log content
fprintf(stderr, "\n"); // add LF after line
fflush(stderr);
va_end(ap);
if (level == LOG_FATAL) {
exit(1);
}
}
void log_perror(char *prefix) {
time_t t;
time(&t);
struct tm *lt = localtime(&t);
fprintf(stderr, "\x1b[36m[ClearDNS]\x1b[0m ");
fprintf(stderr, "\x1b[90m%04d-%02d-%02d %02d:%02d:%02d\x1b[0m",
lt->tm_year + 1900, lt->tm_mon, lt->tm_mday, lt->tm_hour, lt->tm_min, lt->tm_sec);
fprintf(stderr, " %s%s\x1b[0m ", log_color[3], log_string[3]); // error level
fflush(stderr);
perror(prefix);
}