/**
* This snmp logging function allows variable argument list given the
* specified priority, format and a populated va_list structure.
* The default logfile this function writes to is /var/log/snmpd.log.
*
* @param priority is an integer representing the type of message to be written
* to the snmp log file. The types are errors, warning, and information.
* - The error types are:
* - LOG_EMERG system is unusable
* - LOG_ALERT action must be taken immediately
* - LOG_CRIT critical conditions
* - LOG_ERR error conditions
* - The warning type is:
* - LOG_WARNING warning conditions
* - The information types are:
* - LOG_NOTICE normal but significant condition
* - LOG_INFO informational
* - LOG_DEBUG debug-level messages
*
* @param format is a pointer to a char representing the variable argument list
* format used.
*
* @param ap is a va_list type used to traverse the list of arguments.
*
* @return Returns 0 on success, -1 when the code could not format the log-
* string, -2 when dynamic memory could not be allocated if the length
* of the log buffer is greater then 1024 bytes. For each of these
* errors a LOG_ERR messgae is written to the logfile.
*
* @see snmp_log
*/
int
snmp_vlog(int priority, const char *format, va_list ap)
{
char buffer[LOGLENGTH];
int length;
char *dynamic;
va_list aq;
va_copy(aq, ap);
length = vsnprintf(buffer, LOGLENGTH, format, ap);
va_end(ap);
if (length == 0) {
#ifdef NEED_VA_END_AFTER_VA_COPY
va_end(aq);
#endif
return (0); /* Empty string */
}
if (length == -1) {
snmp_log_string(LOG_ERR, "Could not format log-string\n");
#ifdef NEED_VA_END_AFTER_VA_COPY
va_end(aq);
#endif
return (-1);
}
if (length < LOGLENGTH) {
snmp_log_string(priority, buffer);
#ifdef NEED_VA_END_AFTER_VA_COPY
va_end(aq);
#endif
return (0);
}
dynamic = (char *) malloc(length + 1);
if (dynamic == NULL) {
snmp_log_string(LOG_ERR,
"Could not allocate memory for log-message\n");
snmp_log_string(priority, buffer);
#ifdef NEED_VA_END_AFTER_VA_COPY
va_end(aq);
#endif
return (-2);
}
vsnprintf(dynamic, length + 1, format, aq);
snmp_log_string(priority, dynamic);
free(dynamic);
va_end(aq);
return 0;
}
/**
* This snmp logging function allows variable argument list given the
* specified priority, format and a populated va_list structure.
* The default logfile this function writes to is /var/log/snmpd.log.
*
* @param priority is an integer representing the type of message to be written
* to the snmp log file. The types are errors, warning, and information.
* - The error types are:
* - LOG_EMERG system is unusable
* - LOG_ALERT action must be taken immediately
* - LOG_CRIT critical conditions
* - LOG_ERR error conditions
* - The warning type is:
* - LOG_WARNING warning conditions
* - The information types are:
* - LOG_NOTICE normal but significant condition
* - LOG_INFO informational
* - LOG_DEBUG debug-level messages
*
* @param format is a pointer to a char representing the variable argument list
* format used.
*
* @param ap is a va_list type used to traverse the list of arguments.
*
* @return Returns 0 on success, -1 when the code could not format the log-
* string, -2 when dynamic memory could not be allocated if the length
* of the log buffer is greater then 1024 bytes. For each of these
* errors a LOG_ERR messgae is written to the logfile.
*
* @see snmp_log
*/
int
snmp_vlog(int priority, const char *format, va_list ap)
{
char *buffer = NULL;
int length;
length = vasprintf(&buffer, format, ap);
if (length < 0) {
snmp_log_string(LOG_ERR, "Could not format log-string\n");
return -1;
}
snmp_log_string(priority, buffer);
free(buffer);
return 0;
}
void
snmp_log_string(int priority, const char *str)
{
netsnmp_log_handler *logh;
/*
* We've got to be able to log messages *somewhere*!
* If you don't want stderr logging, then enable something else.
*/
if (!logh_head) {
snmp_enable_stderrlog();
snmp_log_string(LOG_WARNING,
"No log handling enabled - turning on stderr logging\n");
}
/*
* Start at the given priority, and work "upwards"....
*/
logh = logh_priorities[priority];
for ( ; logh; logh = logh->next ) {
/*
* ... but skipping any handlers with a "maximum priority"
* that we have already exceeded. And don't forget to
* ensure this logging is turned on (see snmp_disable_stderrlog
* and its cohorts).
*/
if (logh->enabled && (priority >= logh->pri_max))
logh->handler( logh, priority, str );
}
}
int
snmp_vlog (int priority, const char *format, va_list ap)
{
char buffer[LOGLENGTH];
int length;
#if HAVE_VSNPRINTF
char *dynamic;
length=vsnprintf(buffer, LOGLENGTH, format, ap);
#else
length=vsprintf(buffer, format, ap);
#endif
if (length == 0)
return(0); /* Empty string */
if (length == -1) {
snmp_log_string(LOG_ERR, "Could not format log-string\n");
return(-1);
}
if (length < LOGLENGTH) {
snmp_log_string(priority, buffer);
return(0);
}
#if HAVE_VSNPRINTF
dynamic=malloc(length+1);
if (dynamic==NULL) {
snmp_log_string(LOG_ERR, "Could not allocate memory for log-message\n");
snmp_log_string(priority, buffer);
return(-2);
}
vsnprintf(dynamic, length+1, format, ap);
snmp_log_string(priority, dynamic);
free(dynamic);
return(0);
#else
snmp_log_string(priority, buffer);
snmp_log_string(LOG_ERR, "Log-message too long!\n");
return(-3);
#endif
}
