blob: d08ad16d6e4bf4b6a248656ed11f9bff35a36432 [file] [log] [blame]
/*
* General logging functions.
*
* Copyright 2000-2008 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#include <common/config.h>
#include <common/standard.h>
#include <common/time.h>
#include <types/backend.h>
#include <types/global.h>
#include <types/log.h>
#include <types/session.h>
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL (0)
#endif /* !MSG_NOSIGNAL */
const char *log_facilities[NB_LOG_FACILITIES] = {
"kern", "user", "mail", "daemon",
"auth", "syslog", "lpr", "news",
"uucp", "cron", "auth2", "ftp",
"ntp", "audit", "alert", "cron2",
"local0", "local1", "local2", "local3",
"local4", "local5", "local6", "local7"
};
const char *log_levels[NB_LOG_LEVELS] = {
"emerg", "alert", "crit", "err",
"warning", "notice", "info", "debug"
};
const char *monthname[12] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
const char sess_term_cond[8] = "-cCsSPRI"; /* normal, CliTo, CliErr, SrvTo, SrvErr, PxErr, Resource, Internal */
const char sess_fin_state[8] = "-RCHDLQT"; /* cliRequest, srvConnect, srvHeader, Data, Last, Queue, Tarpit */
/*
* Displays the message on stderr with the date and pid. Overrides the quiet
* mode during startup.
*/
void Alert(const char *fmt, ...)
{
va_list argp;
struct tm tm;
if (!(global.mode & MODE_QUIET) || (global.mode & (MODE_VERBOSE | MODE_STARTING))) {
va_start(argp, fmt);
get_localtime(date.tv_sec, &tm);
fprintf(stderr, "[ALERT] %03d/%02d%02d%02d (%d) : ",
tm.tm_yday, tm.tm_hour, tm.tm_min, tm.tm_sec, (int)getpid());
vfprintf(stderr, fmt, argp);
fflush(stderr);
va_end(argp);
}
}
/*
* Displays the message on stderr with the date and pid.
*/
void Warning(const char *fmt, ...)
{
va_list argp;
struct tm tm;
if (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)) {
va_start(argp, fmt);
get_localtime(date.tv_sec, &tm);
fprintf(stderr, "[WARNING] %03d/%02d%02d%02d (%d) : ",
tm.tm_yday, tm.tm_hour, tm.tm_min, tm.tm_sec, (int)getpid());
vfprintf(stderr, fmt, argp);
fflush(stderr);
va_end(argp);
}
}
/*
* Displays the message on <out> only if quiet mode is not set.
*/
void qfprintf(FILE *out, const char *fmt, ...)
{
va_list argp;
if (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)) {
va_start(argp, fmt);
vfprintf(out, fmt, argp);
fflush(out);
va_end(argp);
}
}
/*
* returns log level for <lev> or -1 if not found.
*/
int get_log_level(const char *lev)
{
int level;
level = NB_LOG_LEVELS - 1;
while (level >= 0 && strcmp(log_levels[level], lev))
level--;
return level;
}
/*
* returns log facility for <fac> or -1 if not found.
*/
int get_log_facility(const char *fac)
{
int facility;
facility = NB_LOG_FACILITIES - 1;
while (facility >= 0 && strcmp(log_facilities[facility], fac))
facility--;
return facility;
}
/*
* Return the length of the address endpoint, suitable for use with sendto().
*/
static inline int logsrv_addrlen(const struct logsrv *logsrv)
{
switch (logsrv->u.addr.sa_family) {
case AF_UNIX:
return sizeof(logsrv->u.un);
case AF_INET:
return sizeof(logsrv->u.in);
default:
break;
}
return -1;
}
/*
* This function sends a syslog message to both log servers of a proxy,
* or to global log servers if the proxy is NULL.
* It also tries not to waste too much time computing the message header.
* It doesn't care about errors nor does it report them.
*/
void send_log(struct proxy *p, int level, const char *message, ...)
{
static int logfdunix = -1; /* syslog to AF_UNIX socket */
static int logfdinet = -1; /* syslog to AF_INET socket */
static long tvsec = -1; /* to force the string to be initialized */
va_list argp;
static char logmsg[MAX_SYSLOG_LEN];
static char *dataptr = NULL;
int fac_level;
int hdr_len, data_len;
struct logsrv *logsrvs[2];
int facilities[2], loglevel[2];
int nblogger;
int nbloggers = 0;
char *log_ptr;
if (level < 0 || progname == NULL || message == NULL)
return;
if (unlikely(date.tv_sec != tvsec || dataptr == NULL)) {
/* this string is rebuild only once a second */
struct tm tm;
tvsec = date.tv_sec;
get_localtime(tvsec, &tm);
hdr_len = snprintf(logmsg, sizeof(logmsg),
"<<<<>%s %2d %02d:%02d:%02d %s[%d]: ",
monthname[tm.tm_mon],
tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec,
progname, pid);
/* WARNING: depending upon implementations, snprintf may return
* either -1 or the number of bytes that would be needed to store
* the total message. In both cases, we must adjust it.
*/
if (hdr_len < 0 || hdr_len > sizeof(logmsg))
hdr_len = sizeof(logmsg);
dataptr = logmsg + hdr_len;
}
va_start(argp, message);
/*
* FIXME: we take a huge performance hit here. We might have to replace
* vsnprintf() for a hard-coded log writer.
*/
data_len = vsnprintf(dataptr, logmsg + sizeof(logmsg) - dataptr, message, argp);
if (data_len < 0 || data_len > (logmsg + sizeof(logmsg) - dataptr))
data_len = logmsg + sizeof(logmsg) - dataptr;
va_end(argp);
dataptr[data_len - 1] = '\n'; /* force a break on ultra-long lines */
if (p == NULL) {
if (global.logfac1 >= 0) {
logsrvs[nbloggers] = &global.logsrv1;
facilities[nbloggers] = global.logfac1;
loglevel[nbloggers] = global.loglev1;
nbloggers++;
}
if (global.logfac2 >= 0) {
logsrvs[nbloggers] = &global.logsrv2;
facilities[nbloggers] = global.logfac2;
loglevel[nbloggers] = global.loglev2;
nbloggers++;
}
} else {
if (p->logfac1 >= 0) {
logsrvs[nbloggers] = &p->logsrv1;
facilities[nbloggers] = p->logfac1;
loglevel[nbloggers] = p->loglev1;
nbloggers++;
}
if (p->logfac2 >= 0) {
logsrvs[nbloggers] = &p->logsrv2;
facilities[nbloggers] = p->logfac2;
loglevel[nbloggers] = p->loglev2;
nbloggers++;
}
}
/* Lazily set up syslog sockets for protocol families of configured
* syslog servers. */
for (nblogger = 0; nblogger < nbloggers; nblogger++) {
const struct logsrv *logsrv = logsrvs[nblogger];
int proto, *plogfd;
if (logsrv->u.addr.sa_family == AF_UNIX) {
proto = 0;
plogfd = &logfdunix;
} else {
/* sa_family == AF_INET */
proto = IPPROTO_UDP;
plogfd = &logfdinet;
}
if (*plogfd >= 0) {
/* socket already created. */
continue;
}
if ((*plogfd = socket(logsrv->u.addr.sa_family, SOCK_DGRAM,
proto)) < 0) {
Alert("socket for logger #%d failed: %s (errno=%d)\n",
nblogger + 1, strerror(errno), errno);
return;
}
/* we don't want to receive anything on this socket */
setsockopt(*plogfd, SOL_SOCKET, SO_RCVBUF, &zero, sizeof(zero));
/* does nothing under Linux, maybe needed for others */
shutdown(*plogfd, SHUT_RD);
}
/* Send log messages to syslog server. */
for (nblogger = 0; nblogger < nbloggers; nblogger++) {
const struct logsrv *logsrv = logsrvs[nblogger];
int *plogfd = logsrv->u.addr.sa_family == AF_UNIX ?
&logfdunix : &logfdinet;
int sent;
/* we can filter the level of the messages that are sent to each logger */
if (level > loglevel[nblogger])
continue;
/* For each target, we may have a different facility.
* We can also have a different log level for each message.
* This induces variations in the message header length.
* Since we don't want to recompute it each time, nor copy it every
* time, we only change the facility in the pre-computed header,
* and we change the pointer to the header accordingly.
*/
fac_level = (facilities[nblogger] << 3) + level;
log_ptr = logmsg + 3; /* last digit of the log level */
do {
*log_ptr = '0' + fac_level % 10;
fac_level /= 10;
log_ptr--;
} while (fac_level && log_ptr > logmsg);
*log_ptr = '<';
/* the total syslog message now starts at logptr, for dataptr+data_len-logptr */
sent = sendto(*plogfd, log_ptr, dataptr + data_len - log_ptr,
MSG_DONTWAIT | MSG_NOSIGNAL, &logsrv->u.addr, logsrv_addrlen(logsrv));
if (sent < 0) {
Alert("sendto logger #%d failed: %s (errno=%d)\n",
nblogger, strerror(errno), errno);
}
}
}
/*
* send a log for the session when we have enough info about it
*/
void tcp_sess_log(struct session *s)
{
char pn[INET6_ADDRSTRLEN + strlen(":65535")];
struct proxy *fe = s->fe;
struct proxy *be = s->be;
struct proxy *prx_log;
int tolog;
char *svid;
struct tm tm;
if (s->cli_addr.ss_family == AF_INET)
inet_ntop(AF_INET,
(const void *)&((struct sockaddr_in *)&s->cli_addr)->sin_addr,
pn, sizeof(pn));
else
inet_ntop(AF_INET6,
(const void *)&((struct sockaddr_in6 *)(&s->cli_addr))->sin6_addr,
pn, sizeof(pn));
get_localtime(s->logs.tv_accept.tv_sec, &tm);
if (fe->logfac1 >= 0)
prx_log = fe;
/*
* FIXME: should we fall back to the backend if the frontend did not
* define any log ? It seems like we should not permit such complex
* setups because they would induce a debugging nightmare for the
* admin.
*/
// else if (be->logfac1 >= 0)
// prx_log = be;
else
prx_log = NULL; /* global */
/* FIXME: let's limit ourselves to frontend logging for now. */
tolog = fe->to_log;
svid = (tolog & LW_SVID) ? (s->srv != NULL) ? s->srv->id : "<NOSRV>" : "-";
send_log(prx_log, LOG_INFO, "%s:%d [%02d/%s/%04d:%02d:%02d:%02d.%03d]"
" %s %s/%s %d/%d/%s%d %s%lld"
" %c%c %d/%d/%d/%d/%s%u %d/%d\n",
pn,
(s->cli_addr.ss_family == AF_INET) ?
ntohs(((struct sockaddr_in *)&s->cli_addr)->sin_port) :
ntohs(((struct sockaddr_in6 *)&s->cli_addr)->sin6_port),
tm.tm_mday, monthname[tm.tm_mon], tm.tm_year+1900,
tm.tm_hour, tm.tm_min, tm.tm_sec, s->logs.tv_accept.tv_usec/1000,
fe->id, be->id, svid,
(s->logs.t_queue >= 0) ? s->logs.t_queue : -1,
(s->logs.t_connect >= 0) ? s->logs.t_connect - s->logs.t_queue : -1,
(tolog & LW_BYTES) ? "" : "+", s->logs.t_close,
(tolog & LW_BYTES) ? "" : "+", s->logs.bytes_out,
sess_term_cond[(s->flags & SN_ERR_MASK) >> SN_ERR_SHIFT],
sess_fin_state[(s->flags & SN_FINST_MASK) >> SN_FINST_SHIFT],
actconn, fe->feconn, be->beconn, s->srv ? s->srv->cur_sess : 0,
(s->flags & SN_REDISP)?"+":"",
(s->conn_retries>0)?(be->conn_retries - s->conn_retries):be->conn_retries,
s->logs.srv_queue_size, s->logs.prx_queue_size);
s->logs.logwait = 0;
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/