1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181
|
/*
log.c - logging funtions
Copyright (C) 2002, 2003 Arthur de Jong.
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, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <syslog.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include "log.h"
#include "xmalloc.h"
/* storage for logging modes */
static struct cvsd_log {
FILE *fp; /* NULL==syslog */
int loglevel;
struct cvsd_log *next;
} *cvsd_loglist=NULL;
/* default loglevel when no logging is configured */
static int prelogging_loglevel=LOG_INFO;
/* set loglevel when no logging is configured */
void log_setdefaultloglevel(int loglevel)
{
prelogging_loglevel=loglevel;
}
/* add logging method to configuration list */
static void log_addlogging_fp(FILE *fp,int loglevel)
{
struct cvsd_log *tmp,*lst;
/* create new logstruct */
tmp=(struct cvsd_log *)xmalloc(sizeof(struct cvsd_log));
tmp->fp=fp;
tmp->loglevel=loglevel;
tmp->next=NULL;
/* save the struct in the list */
if (cvsd_loglist==NULL)
cvsd_loglist=tmp;
else
{
for (lst=cvsd_loglist;lst->next!=NULL;lst=lst->next);
lst->next=tmp;
}
}
/* configure logging to a file */
void log_addlogging_file(const char *filename,int loglevel)
{
FILE *fp;
fp=fopen(filename,"a");
if (fp==NULL)
{
log_log(LOG_ERR,"cannot open logfile (%s) for appending: %s",filename,strerror(errno));
exit(1);
}
log_addlogging_fp(fp,loglevel);
}
/* configure logging to syslog */
void log_addlogging_syslog(int loglevel)
{
openlog(PACKAGE,LOG_PID,LOG_DAEMON);
log_addlogging_fp(NULL,loglevel);
}
/* configure a null logging mode (no logging) */
void log_addlogging_none()
{
/* this is a hack, but it's so easy */
log_addlogging_fp(NULL,LOG_EMERG);
}
/* start the logging with the configured logging methods
if no method is configured yet, logging is done to syslog */
void log_startlogging(void)
{
if (cvsd_loglist==NULL)
log_addlogging_syslog(LOG_INFO);
prelogging_loglevel=-1;
}
/* log the given message using the configured logging method */
void log_log(int pri,const char *format, ...)
{
int res;
struct cvsd_log *lst;
/* TODO: make this something better */
#define maxbufferlen 120
char buffer[maxbufferlen];
va_list ap;
/* make the message */
va_start(ap,format);
res=vsnprintf(buffer,maxbufferlen,format,ap);
if ((res<0)||(res>=maxbufferlen))
{
/* truncate with "..." */
buffer[maxbufferlen-2]='.';
buffer[maxbufferlen-3]='.';
buffer[maxbufferlen-4]='.';
}
buffer[maxbufferlen-1]='\0';
va_end(ap);
/* do the logging */
if (prelogging_loglevel>=0)
{
/* if logging is not yet defined, log to stderr */
if (pri<=prelogging_loglevel)
fprintf(stderr,"%s: %s\n",PACKAGE,buffer);
}
else
{
for (lst=cvsd_loglist;lst!=NULL;lst=lst->next)
{
if (pri<=lst->loglevel)
{
if (lst->fp==NULL) /* syslog */
syslog(pri,"%s",buffer);
else /* file */
{
fprintf(lst->fp,"%s: %s\n",PACKAGE,buffer);
fflush(lst->fp);
}
}
}
}
}
/* return the syslog loglevel represented by the string
return -1 on unknown */
int log_getloglevel(const char *lvl)
{
if ( strcmp(lvl,"crit")==0 )
return LOG_CRIT;
else if ( (strcmp(lvl,"error")==0) ||
(strcmp(lvl,"err")==0) )
return LOG_ERR;
else if ( strcmp(lvl,"warning")==0 )
return LOG_WARNING;
else if ( strcmp(lvl,"notice")==0 )
return LOG_NOTICE;
else if ( strcmp(lvl,"info")==0 )
return LOG_INFO;
else if ( strcmp(lvl,"debug")==0 )
return LOG_DEBUG;
else
return -1; /* unknown */
}
|