/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <syslog.h>
#include <thread.h>
#include <string.h>
#include <strings.h>
#include <stdarg.h>
#include <dlfcn.h>
#include <sys/synch.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <ctype.h>
#include <smbsrv/ndl/eventlog.ndl>
#include <smbsrv/libntsvcs.h>
typedef struct logr_eventlog {
const char *el_name;
const char *el_path;
} logr_eventlog_t;
logr_eventlog_t logr_eventlog[] = {
{ "System", "/var/adm/messages" },
{ "smbd", "/var/smb/smbd_log.txt" }
};
typedef enum {
LOGR_MONTH = 0,
LOGR_DAY,
LOGR_TIME,
LOGR_HOST,
LOGR_SOURCE,
LOGR_IDTAG,
LOGR_ID,
LOGR_PRI_FAC,
LOGR_NARG
} logr_syslog_tokens_t;
/*
* Event code translation struct for use in processing config file
*/
typedef struct logr_priority {
char *p_name;
int p_value;
} logr_priority_t;
static logr_priority_t logr_pri_names[] = {
"panic", LOG_EMERG,
"emerg", LOG_EMERG,
"alert", LOG_ALERT,
"crit", LOG_CRIT,
"err", LOG_ERR,
"error", LOG_ERR,
"warn", LOG_WARNING,
"warning", LOG_WARNING,
"notice", LOG_NOTICE,
"info", LOG_INFO,
"debug", LOG_DEBUG
};
typedef struct logr_syslog_node {
list_node_t ln_node;
char ln_logline[LOGR_MAXENTRYLEN];
} logr_syslog_node_t;
static void *logr_interposer_hdl = NULL;
static struct {
boolean_t (*logr_op_supported)(char *);
int (*logr_op_snapshot)(logr_context_t *);
} logr_interposer_ops;
/*
* Set the syslog timestamp.
*
* This is a private helper for logr_syslog_parse_entry(), which
* must ensure that the appropriate argv entries are non-null.
*/
static void
logr_syslog_set_timestamp(char **argv, logr_entry_t *le)
{
char *month = argv[LOGR_MONTH];
char *day = argv[LOGR_DAY];
char *time = argv[LOGR_TIME];
struct timeval now;
struct tm tm, cur_tm;
char buf[32];
bzero(&tm, sizeof (tm));
(void) snprintf(buf, 32, "%s %s %s", month, day, time);
if (strptime(buf, "%b" "%d" "%H:%M:%S", &tm) == NULL) {
le->le_timestamp.tv_sec = 0;
return;
}
(void) gettimeofday(&now, NULL);
(void) localtime_r(&now.tv_sec, &cur_tm);
tm.tm_isdst = cur_tm.tm_isdst;
tm.tm_year = cur_tm.tm_year;
if (tm.tm_mon > cur_tm.tm_mon)
tm.tm_year--;
le->le_timestamp.tv_sec = mktime(&tm);
}
/*
* Set the syslog priority.
*
* This is a private helper for logr_syslog_parse_entry(), which
* must ensure that the appropriate argv entries are non-null.
*/
static void
logr_syslog_set_priority(char **argv, logr_entry_t *le)
{
logr_priority_t *entry;
char *token;
int sz = sizeof (logr_pri_names) / sizeof (logr_pri_names[0]);
int i;
le->le_pri = LOG_INFO;
if ((token = argv[LOGR_PRI_FAC]) == NULL)
return;
for (i = 0; i < sz; i++) {
entry = &logr_pri_names[i];
if (strstr(token, entry->p_name) != NULL) {
le->le_pri = entry->p_value;
break;
}
}
}
/*
* Parse a syslog entry into a log_entry_t structure. A typical syslog
* entry has one of the following formats:
*
* <month> <day> <time> <host> <msg>
* <month> <day> <time> <host> <source>: [ID <ID> <facility.priority>] <msg>
*
* For Example:
* Oct 29 09:49:20 galaxy smbd[104039]: [ID 702911 daemon.info] init done
*/
static int
logr_syslog_parse_entry(char *logline, logr_entry_t *le)
{
char buf[LOGR_MAXENTRYLEN];
char *argv[LOGR_NARG];
char *value;
char *bp;
int i;
(void) memset(argv, 0, sizeof (char *) * LOGR_NARG);
(void) strlcpy(buf, logline, LOGR_MAXENTRYLEN);
for (bp = buf, i = 0; i < LOGR_NARG; ++i) {
if (i == LOGR_SOURCE) {
/*
* If the [ID key is not present, everything
* that follows is the message text.
*/
if (strstr(bp, "[ID") == NULL)
break;
}
do {
if ((value = strsep(&bp, " \t")) == NULL)
break;
} while (*value == '\0');
if ((argv[i] = value) == NULL)
return (-1);
}
/*
* bp should be pointing at the remaining message text.
*/
if ((value = strchr(bp, '\n')) != NULL)
*value = '\0';
(void) strlcpy(le->le_msg, bp, LOGR_MAXENTRYLEN);
(void) strlcpy(le->le_hostname, argv[LOGR_HOST], MAXHOSTNAMELEN);
logr_syslog_set_timestamp(argv, le);
logr_syslog_set_priority(argv, le);
return (0);
}
static void
logr_syslog_destroy_queue(list_t *queue)
{
logr_syslog_node_t *head;
while ((head = list_head(queue)) != NULL) {
list_remove(queue, head);
free(head);
}
list_destroy(queue);
}
static int
logr_syslog_construct_queue(FILE *fp, list_t *queue)
{
logr_syslog_node_t *node, *head;
int line_num = 0;
char logline[LOGR_MAXENTRYLEN];
list_create(queue, sizeof (logr_syslog_node_t),
offsetof(logr_syslog_node_t, ln_node));
bzero(logline, LOGR_MAXENTRYLEN);
while (fgets(logline, LOGR_MAXENTRYLEN, fp) != NULL) {
/* Read the last 1024 entries in the queue */
if (line_num > LOGR_NMSGMASK) {
head = list_head(queue);
list_remove(queue, head);
free(head);
}
if ((node = malloc(sizeof (logr_syslog_node_t))) == NULL) {
logr_syslog_destroy_queue(queue);
return (-1);
}
bzero(node->ln_logline, LOGR_MAXENTRYLEN);
(void) strlcpy(node->ln_logline, logline, LOGR_MAXENTRYLEN);
list_insert_tail(queue, node);
bzero(logline, LOGR_MAXENTRYLEN);
line_num++;
}
return (0);
}
/*
* logr_syslog_load
*
* Loads the given log file into log_info_t structure format.
*
* Returns pointer to the allocated log structure on success.
* Note that the caller is responsible for freeing the allocated
* memory for returned log_info_t structure.
*/
static int
logr_syslog_load(FILE *fp, logr_info_t *log)
{
logr_entry_t *entry;
int i = 0;
list_t queue;
logr_syslog_node_t *node;
if (logr_syslog_construct_queue(fp, &queue) < 0)
return (-1);
node = list_head(&queue);
while (node) {
entry = &log->li_entry[i];
if (logr_syslog_parse_entry(node->ln_logline, entry) != 0) {
node = list_next(&queue, node);
continue;
}
if (++i > LOGR_NMSGMASK)
break;
node = list_next(&queue, node);
}
logr_syslog_destroy_queue(&queue);
log->li_idx = i;
return (0);
}
/*
* logr_syslog_snapshot
*
* Return a snapshot of the given log in the buffer
* provided by the caller. Returns the number of entries in
* the log.
*/
static int
logr_syslog_snapshot(char *logname, logr_info_t *loginfo)
{
FILE *fp;
char path[MAXPATHLEN];
int i;
if ((loginfo == NULL) || (!logr_is_supported(logname)))
return (-1);
path[0] = '\0';
for (i = 0; i < sizeof (logr_eventlog)/sizeof (logr_eventlog[0]); ++i) {
if (strcasecmp(logname, logr_eventlog[i].el_name) == 0)
(void) strlcpy(path, logr_eventlog[i].el_path,
MAXPATHLEN);
}
if ((fp = fopen(path, "r")) == 0)
return (-1);
if (logr_syslog_load(fp, loginfo) < 0) {
(void) fclose(fp);
return (-1);
}
(void) fclose(fp);
if (loginfo->li_idx <= LOGR_NMSGMASK)
return (loginfo->li_idx);
return (LOGR_NMSGMASK+1);
}
/*
* logr_is_supported
*
* Determines if a given log is supported or not.
* Returns B_TRUE on success, B_FALSE on failure.
*/
boolean_t
logr_is_supported(char *log_name)
{
int i;
if (log_name == NULL)
return (B_FALSE);
if (logr_interposer_ops.logr_op_supported != NULL)
return (logr_interposer_ops.logr_op_supported(log_name));
for (i = 0; i < sizeof (logr_eventlog)/sizeof (logr_eventlog[0]); ++i) {
if (strcasecmp(log_name, logr_eventlog[i].el_name) == 0)
return (B_TRUE);
}
return (B_FALSE);
}
/*
* logr_get_snapshot
*
* Allocate memory and make a copy, as a snapshot, from system log.
* Returns 0 on success, -1 on failure.
*/
int
logr_get_snapshot(logr_context_t *ctx)
{
logr_read_data_t *data = NULL;
if (logr_interposer_ops.logr_op_snapshot != NULL)
return (logr_interposer_ops.logr_op_snapshot(ctx));
ctx->lc_cached_read_data = malloc(sizeof (logr_read_data_t));
if (ctx->lc_cached_read_data != NULL) {
data = ctx->lc_cached_read_data;
data->rd_log = (logr_info_t *)malloc(sizeof (logr_info_t));
if (data->rd_log == NULL) {
free(data);
return (-1);
}
bzero(data->rd_log, sizeof (logr_info_t));
data->rd_tot_recnum = logr_syslog_snapshot(ctx->lc_source_name,
data->rd_log);
if (data->rd_tot_recnum < 0) {
free(data->rd_log);
free(data);
return (-1);
}
data->rd_first_read = 1;
return (0);
}
return (-1);
}
/*
* logr_init
*
* Initializes the Eventlog service.
* Checks to see if a event log utility library
* is interposed. If yes then it'll initializes logr_interposer_ops
* structure with function pointers from this library.
*/
void
logr_init(void)
{
logr_interposer_hdl = smb_dlopen();
if (logr_interposer_hdl == NULL)
return;
bzero((void *)&logr_interposer_ops, sizeof (logr_interposer_ops));
logr_interposer_ops.logr_op_supported =
(boolean_t (*)())dlsym(logr_interposer_hdl, "logr_is_supported");
logr_interposer_ops.logr_op_snapshot =
(int (*)())dlsym(logr_interposer_hdl, "logr_get_snapshot");
if (logr_interposer_ops.logr_op_supported == NULL ||
logr_interposer_ops.logr_op_snapshot == NULL)
logr_fini();
}
/*
* logr_fini
*
* Finalizes the Eventlog service.
* Closes handle to interposed library.
*/
void
logr_fini(void)
{
smb_dlclose(logr_interposer_hdl);
logr_interposer_hdl = NULL;
bzero((void *)&logr_interposer_ops, sizeof (logr_interposer_ops));
}