diff options
Diffstat (limited to '')
| -rw-r--r-- | libnetdata/log/log.c | 872 |
1 files changed, 872 insertions, 0 deletions
diff --git a/libnetdata/log/log.c b/libnetdata/log/log.c new file mode 100644 index 0000000..95d3d98 --- /dev/null +++ b/libnetdata/log/log.c @@ -0,0 +1,872 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include <daemon/main.h> +#include "../libnetdata.h" + +int web_server_is_multithreaded = 1; + +const char *program_name = ""; +uint64_t debug_flags = DEBUG; + +int access_log_syslog = 1; +int error_log_syslog = 1; +int output_log_syslog = 1; // debug log + +int stdaccess_fd = -1; +FILE *stdaccess = NULL; + +const char *stdaccess_filename = NULL; +const char *stderr_filename = NULL; +const char *stdout_filename = NULL; +const char *facility_log = NULL; + +// ---------------------------------------------------------------------------- +// Log facility(https://tools.ietf.org/html/rfc5424) +// +// The facilities accepted in the Netdata are in according with the following +// header files for their respective operate system: +// sys/syslog.h (Linux ) +// sys/sys/syslog.h (FreeBSD) +// bsd/sys/syslog.h (darwin-xnu) + +#define LOG_AUTH_KEY "auth" +#define LOG_AUTHPRIV_KEY "authpriv" +#ifdef __FreeBSD__ +# define LOG_CONSOLE_KEY "console" +#endif +#define LOG_CRON_KEY "cron" +#define LOG_DAEMON_KEY "daemon" +#define LOG_FTP_KEY "ftp" +#ifdef __APPLE__ +# define LOG_INSTALL_KEY "install" +#endif +#define LOG_KERN_KEY "kern" +#define LOG_LPR_KEY "lpr" +#define LOG_MAIL_KEY "mail" +//#define LOG_INTERNAL_MARK_KEY "mark" +#ifdef __APPLE__ +# define LOG_NETINFO_KEY "netinfo" +# define LOG_RAS_KEY "ras" +# define LOG_REMOTEAUTH_KEY "remoteauth" +#endif +#define LOG_NEWS_KEY "news" +#ifdef __FreeBSD__ +# define LOG_NTP_KEY "ntp" +#endif +#define LOG_SECURITY_KEY "security" +#define LOG_SYSLOG_KEY "syslog" +#define LOG_USER_KEY "user" +#define LOG_UUCP_KEY "uucp" +#ifdef __APPLE__ +# define LOG_LAUNCHD_KEY "launchd" +#endif +#define LOG_LOCAL0_KEY "local0" +#define LOG_LOCAL1_KEY "local1" +#define LOG_LOCAL2_KEY "local2" +#define LOG_LOCAL3_KEY "local3" +#define LOG_LOCAL4_KEY "local4" +#define LOG_LOCAL5_KEY "local5" +#define LOG_LOCAL6_KEY "local6" +#define LOG_LOCAL7_KEY "local7" + +static int log_facility_id(const char *facility_name) +{ + static int + hash_auth = 0, + hash_authpriv = 0, +#ifdef __FreeBSD__ + hash_console = 0, +#endif + hash_cron = 0, + hash_daemon = 0, + hash_ftp = 0, +#ifdef __APPLE__ + hash_install = 0, +#endif + hash_kern = 0, + hash_lpr = 0, + hash_mail = 0, +// hash_mark = 0, +#ifdef __APPLE__ + hash_netinfo = 0, + hash_ras = 0, + hash_remoteauth = 0, +#endif + hash_news = 0, +#ifdef __FreeBSD__ + hash_ntp = 0, +#endif + hash_security = 0, + hash_syslog = 0, + hash_user = 0, + hash_uucp = 0, +#ifdef __APPLE__ + hash_launchd = 0, +#endif + hash_local0 = 0, + hash_local1 = 0, + hash_local2 = 0, + hash_local3 = 0, + hash_local4 = 0, + hash_local5 = 0, + hash_local6 = 0, + hash_local7 = 0; + + if(unlikely(!hash_auth)) + { + hash_auth = simple_hash(LOG_AUTH_KEY); + hash_authpriv = simple_hash(LOG_AUTHPRIV_KEY); +#ifdef __FreeBSD__ + hash_console = simple_hash(LOG_CONSOLE_KEY); +#endif + hash_cron = simple_hash(LOG_CRON_KEY); + hash_daemon = simple_hash(LOG_DAEMON_KEY); + hash_ftp = simple_hash(LOG_FTP_KEY); +#ifdef __APPLE__ + hash_install = simple_hash(LOG_INSTALL_KEY); +#endif + hash_kern = simple_hash(LOG_KERN_KEY); + hash_lpr = simple_hash(LOG_LPR_KEY); + hash_mail = simple_hash(LOG_MAIL_KEY); +// hash_mark = simple_uhash(); +#ifdef __APPLE__ + hash_netinfo = simple_hash(LOG_NETINFO_KEY); + hash_ras = simple_hash(LOG_RAS_KEY); + hash_remoteauth = simple_hash(LOG_REMOTEAUTH_KEY); +#endif + hash_news = simple_hash(LOG_NEWS_KEY); +#ifdef __FreeBSD__ + hash_ntp = simple_hash(LOG_NTP_KEY); +#endif + hash_security = simple_hash(LOG_SECURITY_KEY); + hash_syslog = simple_hash(LOG_SYSLOG_KEY); + hash_user = simple_hash(LOG_USER_KEY); + hash_uucp = simple_hash(LOG_UUCP_KEY); +#ifdef __APPLE__ + hash_launchd = simple_hash(LOG_LAUNCHD_KEY); +#endif + hash_local0 = simple_hash(LOG_LOCAL0_KEY); + hash_local1 = simple_hash(LOG_LOCAL1_KEY); + hash_local2 = simple_hash(LOG_LOCAL2_KEY); + hash_local3 = simple_hash(LOG_LOCAL3_KEY); + hash_local4 = simple_hash(LOG_LOCAL4_KEY); + hash_local5 = simple_hash(LOG_LOCAL5_KEY); + hash_local6 = simple_hash(LOG_LOCAL6_KEY); + hash_local7 = simple_hash(LOG_LOCAL7_KEY); + } + + int hash = simple_hash(facility_name); + if ( hash == hash_auth ) + { + return LOG_AUTH; + } + else if ( hash == hash_authpriv ) + { + return LOG_AUTHPRIV; + } +#ifdef __FreeBSD__ + else if ( hash == hash_console ) + { + return LOG_CONSOLE; + } +#endif + else if ( hash == hash_cron ) + { + return LOG_CRON; + } + else if ( hash == hash_daemon ) + { + return LOG_DAEMON; + } + else if ( hash == hash_ftp ) + { + return LOG_FTP; + } +#ifdef __APPLE__ + else if ( hash == hash_install ) + { + return LOG_INSTALL; + } +#endif + else if ( hash == hash_kern ) + { + return LOG_KERN; + } + else if ( hash == hash_lpr ) + { + return LOG_LPR; + } + else if ( hash == hash_mail ) + { + return LOG_MAIL; + } + /* + else if ( hash == hash_mark ) + { + //this is internal for all OS + return INTERNAL_MARK; + } + */ +#ifdef __APPLE__ + else if ( hash == hash_netinfo ) + { + return LOG_NETINFO; + } + else if ( hash == hash_ras ) + { + return LOG_RAS; + } + else if ( hash == hash_remoteauth ) + { + return LOG_REMOTEAUTH; + } +#endif + else if ( hash == hash_news ) + { + return LOG_NEWS; + } +#ifdef __FreeBSD__ + else if ( hash == hash_ntp ) + { + return LOG_NTP; + } +#endif + else if ( hash == hash_security ) + { + //FreeBSD is the unique that does not consider + //this facility deprecated. We are keeping + //it for other OS while they are kept in their headers. +#ifdef __FreeBSD__ + return LOG_SECURITY; +#else + return LOG_AUTH; +#endif + } + else if ( hash == hash_syslog ) + { + return LOG_SYSLOG; + } + else if ( hash == hash_user ) + { + return LOG_USER; + } + else if ( hash == hash_uucp ) + { + return LOG_UUCP; + } + else if ( hash == hash_local0 ) + { + return LOG_LOCAL0; + } + else if ( hash == hash_local1 ) + { + return LOG_LOCAL1; + } + else if ( hash == hash_local2 ) + { + return LOG_LOCAL2; + } + else if ( hash == hash_local3 ) + { + return LOG_LOCAL3; + } + else if ( hash == hash_local4 ) + { + return LOG_LOCAL4; + } + else if ( hash == hash_local5 ) + { + return LOG_LOCAL5; + } + else if ( hash == hash_local6 ) + { + return LOG_LOCAL6; + } + else if ( hash == hash_local7 ) + { + return LOG_LOCAL7; + } +#ifdef __APPLE__ + else if ( hash == hash_launchd ) + { + return LOG_LAUNCHD; + } +#endif + + return LOG_DAEMON; +} + +//we do not need to use this now, but I already created this function to be +//used case necessary. +/* +char *log_facility_name(int code) +{ + char *defvalue = { "daemon" }; + switch(code) + { + case LOG_AUTH: + { + return "auth"; + } + case LOG_AUTHPRIV: + { + return "authpriv"; + } +#ifdef __FreeBSD__ + case LOG_CONSOLE: + { + return "console"; + } +#endif + case LOG_CRON: + { + return "cron"; + } + case LOG_DAEMON: + { + return defvalue; + } + case LOG_FTP: + { + return "ftp"; + } +#ifdef __APPLE__ + case LOG_INSTALL: + { + return "install"; + } +#endif + case LOG_KERN: + { + return "kern"; + } + case LOG_LPR: + { + return "lpr"; + } + case LOG_MAIL: + { + return "mail"; + } +#ifdef __APPLE__ + case LOG_NETINFO: + { + return "netinfo" ; + } + case LOG_RAS: + { + return "ras"; + } + case LOG_REMOTEAUTH: + { + return "remoteauth"; + } +#endif + case LOG_NEWS: + { + return "news"; + } +#ifdef __FreeBSD__ + case LOG_NTP: + { + return "ntp" ; + } + case LOG_SECURITY: + { + return "security"; + } +#endif + case LOG_SYSLOG: + { + return "syslog"; + } + case LOG_USER: + { + return "user"; + } + case LOG_UUCP: + { + return "uucp"; + } + case LOG_LOCAL0: + { + return "local0"; + } + case LOG_LOCAL1: + { + return "local1"; + } + case LOG_LOCAL2: + { + return "local2"; + } + case LOG_LOCAL3: + { + return "local3"; + } + case LOG_LOCAL4: + { + return "local4" ; + } + case LOG_LOCAL5: + { + return "local5"; + } + case LOG_LOCAL6: + { + return "local6"; + } + case LOG_LOCAL7: + { + return "local7" ; + } +#ifdef __APPLE__ + case LOG_LAUNCHD: + { + return "launchd"; + } +#endif + } + + return defvalue; +} +*/ + +// ---------------------------------------------------------------------------- + +void syslog_init() { + static int i = 0; + + if(!i) { + openlog(program_name, LOG_PID,log_facility_id(facility_log)); + i = 1; + } +} + +#define LOG_DATE_LENGTH 26 + +static inline void log_date(char *buffer, size_t len) { + if(unlikely(!buffer || !len)) + return; + + time_t t; + struct tm *tmp, tmbuf; + + t = now_realtime_sec(); + tmp = localtime_r(&t, &tmbuf); + + if (tmp == NULL) { + buffer[0] = '\0'; + return; + } + + if (unlikely(strftime(buffer, len, "%Y-%m-%d %H:%M:%S", tmp) == 0)) + buffer[0] = '\0'; + + buffer[len - 1] = '\0'; +} + +static netdata_mutex_t log_mutex = NETDATA_MUTEX_INITIALIZER; +static inline void log_lock() { + netdata_mutex_lock(&log_mutex); +} +static inline void log_unlock() { + netdata_mutex_unlock(&log_mutex); +} + +static FILE *open_log_file(int fd, FILE *fp, const char *filename, int *enabled_syslog, int is_stdaccess, int *fd_ptr) { + int f, devnull = 0; + + if(!filename || !*filename || !strcmp(filename, "none") || !strcmp(filename, "/dev/null")) { + filename = "/dev/null"; + devnull = 1; + } + + if(!strcmp(filename, "syslog")) { + filename = "/dev/null"; + devnull = 1; + + syslog_init(); + if(enabled_syslog) *enabled_syslog = 1; + } + else if(enabled_syslog) *enabled_syslog = 0; + + // don't do anything if the user is willing + // to have the standard one + if(!strcmp(filename, "system")) { + if(fd != -1 && !is_stdaccess) { + if(fd_ptr) *fd_ptr = fd; + return fp; + } + + filename = "stderr"; + } + + if(!strcmp(filename, "stdout")) + f = STDOUT_FILENO; + + else if(!strcmp(filename, "stderr")) + f = STDERR_FILENO; + + else { + f = open(filename, O_WRONLY | O_APPEND | O_CREAT, 0664); + if(f == -1) { + error("Cannot open file '%s'. Leaving %d to its default.", filename, fd); + if(fd_ptr) *fd_ptr = fd; + return fp; + } + } + + // if there is a level-2 file pointer + // flush it before switching the level-1 fds + if(fp) + fflush(fp); + + if(devnull && is_stdaccess) { + fd = -1; + fp = NULL; + } + + if(fd != f && fd != -1) { + // it automatically closes + int t = dup2(f, fd); + if (t == -1) { + error("Cannot dup2() new fd %d to old fd %d for '%s'", f, fd, filename); + close(f); + if(fd_ptr) *fd_ptr = fd; + return fp; + } + // info("dup2() new fd %d to old fd %d for '%s'", f, fd, filename); + close(f); + } + else fd = f; + + if(!fp) { + fp = fdopen(fd, "a"); + if (!fp) + error("Cannot fdopen() fd %d ('%s')", fd, filename); + else { + if (setvbuf(fp, NULL, _IOLBF, 0) != 0) + error("Cannot set line buffering on fd %d ('%s')", fd, filename); + } + } + + if(fd_ptr) *fd_ptr = fd; + return fp; +} + +void reopen_all_log_files() { + if(stdout_filename) + open_log_file(STDOUT_FILENO, stdout, stdout_filename, &output_log_syslog, 0, NULL); + + if(stderr_filename) + open_log_file(STDERR_FILENO, stderr, stderr_filename, &error_log_syslog, 0, NULL); + + if(stdaccess_filename) + stdaccess = open_log_file(stdaccess_fd, stdaccess, stdaccess_filename, &access_log_syslog, 1, &stdaccess_fd); +} + +void open_all_log_files() { + // disable stdin + open_log_file(STDIN_FILENO, stdin, "/dev/null", NULL, 0, NULL); + + open_log_file(STDOUT_FILENO, stdout, stdout_filename, &output_log_syslog, 0, NULL); + open_log_file(STDERR_FILENO, stderr, stderr_filename, &error_log_syslog, 0, NULL); + stdaccess = open_log_file(stdaccess_fd, stdaccess, stdaccess_filename, &access_log_syslog, 1, &stdaccess_fd); +} + +// ---------------------------------------------------------------------------- +// error log throttling + +time_t error_log_throttle_period = 1200; +unsigned long error_log_errors_per_period = 200; +unsigned long error_log_errors_per_period_backup = 0; + +int error_log_limit(int reset) { + static time_t start = 0; + static unsigned long counter = 0, prevented = 0; + + // fprintf(stderr, "FLOOD: counter=%lu, allowed=%lu, backup=%lu, period=%llu\n", counter, error_log_errors_per_period, error_log_errors_per_period_backup, (unsigned long long)error_log_throttle_period); + + // do not throttle if the period is 0 + if(error_log_throttle_period == 0) + return 0; + + // prevent all logs if the errors per period is 0 + if(error_log_errors_per_period == 0) +#ifdef NETDATA_INTERNAL_CHECKS + return 0; +#else + return 1; +#endif + + time_t now = now_monotonic_sec(); + if(!start) start = now; + + if(reset) { + if(prevented) { + char date[LOG_DATE_LENGTH]; + log_date(date, LOG_DATE_LENGTH); + fprintf(stderr, "%s: %s LOG FLOOD PROTECTION reset for process '%s' (prevented %lu logs in the last %ld seconds).\n" + , date + , program_name + , program_name + , prevented + , now - start + ); + } + + start = now; + counter = 0; + prevented = 0; + } + + // detect if we log too much + counter++; + + if(now - start > error_log_throttle_period) { + if(prevented) { + char date[LOG_DATE_LENGTH]; + log_date(date, LOG_DATE_LENGTH); + fprintf(stderr, "%s: %s LOG FLOOD PROTECTION resuming logging from process '%s' (prevented %lu logs in the last %ld seconds).\n" + , date + , program_name + , program_name + , prevented + , error_log_throttle_period + ); + } + + // restart the period accounting + start = now; + counter = 1; + prevented = 0; + + // log this error + return 0; + } + + if(counter > error_log_errors_per_period) { + if(!prevented) { + char date[LOG_DATE_LENGTH]; + log_date(date, LOG_DATE_LENGTH); + fprintf(stderr, "%s: %s LOG FLOOD PROTECTION too many logs (%lu logs in %ld seconds, threshold is set to %lu logs in %ld seconds). Preventing more logs from process '%s' for %ld seconds.\n" + , date + , program_name + , counter + , now - start + , error_log_errors_per_period + , error_log_throttle_period + , program_name + , start + error_log_throttle_period - now); + } + + prevented++; + + // prevent logging this error +#ifdef NETDATA_INTERNAL_CHECKS + return 0; +#else + return 1; +#endif + } + + return 0; +} + +// ---------------------------------------------------------------------------- +// debug log + +void debug_int( const char *file, const char *function, const unsigned long line, const char *fmt, ... ) { + va_list args; + + char date[LOG_DATE_LENGTH]; + log_date(date, LOG_DATE_LENGTH); + + va_start( args, fmt ); + printf("%s: %s DEBUG : %s : (%04lu@%-10.10s:%-15.15s): ", date, program_name, netdata_thread_tag(), line, file, function); + vprintf(fmt, args); + va_end( args ); + putchar('\n'); + + if(output_log_syslog) { + va_start( args, fmt ); + vsyslog(LOG_ERR, fmt, args ); + va_end( args ); + } + + fflush(stdout); +} + +// ---------------------------------------------------------------------------- +// info log + +void info_int( const char *file, const char *function, const unsigned long line, const char *fmt, ... ) +{ + va_list args; + + // prevent logging too much + if(error_log_limit(0)) return; + + if(error_log_syslog) { + va_start( args, fmt ); + vsyslog(LOG_INFO, fmt, args ); + va_end( args ); + } + + char date[LOG_DATE_LENGTH]; + log_date(date, LOG_DATE_LENGTH); + + log_lock(); + + va_start( args, fmt ); + if(debug_flags) fprintf(stderr, "%s: %s INFO : %s : (%04lu@%-10.10s:%-15.15s): ", date, program_name, netdata_thread_tag(), line, file, function); + else fprintf(stderr, "%s: %s INFO : %s : ", date, program_name, netdata_thread_tag()); + vfprintf( stderr, fmt, args ); + va_end( args ); + + fputc('\n', stderr); + + log_unlock(); +} + +// ---------------------------------------------------------------------------- +// error log + +#if defined(STRERROR_R_CHAR_P) +// GLIBC version of strerror_r +static const char *strerror_result(const char *a, const char *b) { (void)b; return a; } +#elif defined(HAVE_STRERROR_R) +// POSIX version of strerror_r +static const char *strerror_result(int a, const char *b) { (void)a; return b; } +#elif defined(HAVE_C__GENERIC) + +// what a trick! +// http://stackoverflow.com/questions/479207/function-overloading-in-c +static const char *strerror_result_int(int a, const char *b) { (void)a; return b; } +static const char *strerror_result_string(const char *a, const char *b) { (void)b; return a; } + +#define strerror_result(a, b) _Generic((a), \ + int: strerror_result_int, \ + char *: strerror_result_string \ + )(a, b) + +#else +#error "cannot detect the format of function strerror_r()" +#endif + +void error_int( const char *prefix, const char *file, const char *function, const unsigned long line, const char *fmt, ... ) { + // save a copy of errno - just in case this function generates a new error + int __errno = errno; + + va_list args; + + // prevent logging too much + if(error_log_limit(0)) return; + + if(error_log_syslog) { + va_start( args, fmt ); + vsyslog(LOG_ERR, fmt, args ); + va_end( args ); + } + + char date[LOG_DATE_LENGTH]; + log_date(date, LOG_DATE_LENGTH); + + log_lock(); + + va_start( args, fmt ); + if(debug_flags) fprintf(stderr, "%s: %s %-5.5s : %s : (%04lu@%-10.10s:%-15.15s): ", date, program_name, prefix, netdata_thread_tag(), line, file, function); + else fprintf(stderr, "%s: %s %-5.5s : %s : ", date, program_name, prefix, netdata_thread_tag()); + vfprintf( stderr, fmt, args ); + va_end( args ); + + if(__errno) { + char buf[1024]; + fprintf(stderr, " (errno %d, %s)\n", __errno, strerror_result(strerror_r(__errno, buf, 1023), buf)); + errno = 0; + } + else + fputc('\n', stderr); + + log_unlock(); +} + +void fatal_int( const char *file, const char *function, const unsigned long line, const char *fmt, ... ) { + // save a copy of errno - just in case this function generates a new error + int __errno = errno; + va_list args; + const char *thread_tag; + char os_threadname[NETDATA_THREAD_NAME_MAX + 1]; + + if(error_log_syslog) { + va_start( args, fmt ); + vsyslog(LOG_CRIT, fmt, args ); + va_end( args ); + } + + thread_tag = netdata_thread_tag(); + if (!netdata_thread_tag_exists()) { + os_thread_get_current_name_np(os_threadname); + if ('\0' != os_threadname[0]) { /* If it is not an empty string replace "MAIN" thread_tag */ + thread_tag = os_threadname; + } + } + + char date[LOG_DATE_LENGTH]; + log_date(date, LOG_DATE_LENGTH); + + log_lock(); + + va_start( args, fmt ); + if(debug_flags) fprintf(stderr, "%s: %s FATAL : %s : (%04lu@%-10.10s:%-15.15s): ", date, program_name, thread_tag, line, file, function); + else fprintf(stderr, "%s: %s FATAL : %s : ", date, program_name, thread_tag); + vfprintf( stderr, fmt, args ); + va_end( args ); + + perror(" # "); + fputc('\n', stderr); + + log_unlock(); + + char action_data[70+1]; + snprintfz(action_data, 70, "%04lu@%-10.10s:%-15.15s/%d", line, file, function, __errno); + char action_result[60+1]; + + snprintfz(action_result, 60, "%s:%s", program_name, strncmp(thread_tag, "STREAM_RECEIVER", strlen("STREAM_RECEIVER")) ? thread_tag : "[x]"); + send_statistics("FATAL", action_result, action_data); + + netdata_cleanup_and_exit(1); +} + +// ---------------------------------------------------------------------------- +// access log + +void log_access( const char *fmt, ... ) { + va_list args; + + if(access_log_syslog) { + va_start( args, fmt ); + vsyslog(LOG_INFO, fmt, args ); + va_end( args ); + } + + if(stdaccess) { + static netdata_mutex_t access_mutex = NETDATA_MUTEX_INITIALIZER; + + if(web_server_is_multithreaded) + netdata_mutex_lock(&access_mutex); + + char date[LOG_DATE_LENGTH]; + log_date(date, LOG_DATE_LENGTH); + fprintf(stdaccess, "%s: ", date); + + va_start( args, fmt ); + vfprintf( stdaccess, fmt, args ); + va_end( args ); + fputc('\n', stdaccess); + + if(web_server_is_multithreaded) + netdata_mutex_unlock(&access_mutex); + } +} |