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pgsql-fd.c
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/*
* Copyright (c) 2013 Inteos Sp. z o.o.
* All right reserved. See LICENSE.pgsql for details.
*
* This is a Bareos plugin for making backup and restore of PostgreSQL database.
*
* config file: pgsql.conf
#
# Config file for pgsql plugin
#
PGDATA = <pg.data.cluster.path>
PGHOST = <path.to.sockets.directory>
PGPORT = <socket.'port'>
PGVERSION = "8.x" | "9.x"
CATDB = <catalog.db.name>
CATDBHOST = <catalog.db.host>
CATDBPORT = <catalog.db.port>
CATUSER = <catalog.db.user>
CATPASSWD = <catalog.db.password>
ARCHDEST = <destination.of.archived.wal's.path>
ARCHCLIENT = <name.of.archived.client>
*/
/*
TODO:
* add a timeout watchdog thread to check if everything is ok.
* add a remote ARCHDEST using SSH/SCP
* add an offline backup mode of operation
* scenario:
* if database instance is down then perform a standard file backup (including pg_xlog)
* if database is running and plugin command having 'dboff' parameter then shutdown a database
* instance and perform a standard file backup (including pg_xlog), at the end startup an
* instance
* add an integration with pgsqllib utility framework
* prepare a docummentation about plugin
*/
#include "bareos.h"
#include "fd_plugins.h"
/* it is PostgreSQL backup plugin, so we need a libpq library */
#include <libpq-fe.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <libgen.h>
#include <utime.h>
#include "keylist.h"
#include "parseconfig.h"
/*
* libbac uses its own sscanf implementation which is not compatible with
* libc implementation, unfortunately. usage of bsscanf require format string rewriting.
*/
#ifdef sscanf
#undef sscanf
#endif
#ifdef __cplusplus
extern "C" {
#endif
#define PLUGIN_LICENSE "AGPLv3"
#define PLUGIN_AUTHOR "Inteos Sp. z o.o."
#define PLUGIN_DATE "April 2013"
#define PLUGIN_VERSION "2.2"
#define PLUGIN_DESCRIPTION "PostgreSQL online backup and recovery plugin (c) Inteos Sp. z o.o."
#define PLUGIN_INFO "pgsql plugin: "
/* Forward referenced functions */
static bRC newPlugin(bpContext *ctx);
static bRC freePlugin(bpContext *ctx);
static bRC getPluginValue(bpContext *ctx, pVariable var, void *value);
static bRC setPluginValue(bpContext *ctx, pVariable var, void *value);
static bRC handlePluginEvent(bpContext *ctx, bEvent *event, void *value);
static bRC startBackupFile(bpContext *ctx, struct save_pkt *sp);
static bRC endBackupFile(bpContext *ctx);
static bRC pluginIO(bpContext *ctx, struct io_pkt *io);
static bRC startRestoreFile(bpContext *ctx, const char *cmd);
static bRC endRestoreFile(bpContext *ctx);
static bRC createFile(bpContext *ctx, struct restore_pkt *rp);
static bRC setFileAttributes(bpContext *ctx, struct restore_pkt *rp);
static bRC checkFile(bpContext *ctx, char *fname);
keylist * get_file_list ( bpContext *ctx, keylist * list, const char * base, const char * path );
/* Pointers to Bareos functions */
static bFuncs *bfuncs = NULL;
static bInfo *binfo = NULL;
static genpInfo pluginInfo = {
sizeof(genpInfo),
FD_PLUGIN_INTERFACE_VERSION,
FD_PLUGIN_MAGIC,
PLUGIN_LICENSE,
PLUGIN_AUTHOR,
PLUGIN_DATE,
PLUGIN_VERSION,
PLUGIN_DESCRIPTION,
};
static pFuncs pluginFuncs = {
sizeof(pluginFuncs),
FD_PLUGIN_INTERFACE_VERSION,
/* Entry points into plugin */
newPlugin,
freePlugin,
getPluginValue,
setPluginValue,
handlePluginEvent,
startBackupFile,
endBackupFile,
startRestoreFile,
endRestoreFile,
pluginIO,
createFile,
setFileAttributes,
checkFile
};
/*
* pgsql plugin requires working PostgreSQL catalog database
* it could be Bareos catalog database if it is postgresql
* it can't be database which we backup, because it has to be available
* during instance shutdown, when WAls are generated.
*/
enum PGSQLMode {
PGSQL_NONE = 0,
PGSQL_ARCH_BACKUP,
PGSQL_DB_BACKUP,
PGSQL_ARCH_RESTORE,
PGSQL_DB_RESTORE
};
enum PGFileType {
PG_NONE = 0,
PG_FILE,
PG_LINK,
PG_DIR
};
typedef enum {
PARSE_BACKUP,
PARSE_RESTORE
} ParseMode;
typedef struct _pg_plug_inst {
int JobId;
PGconn *catdb;
char *restore_command_value;
char *configfile;
keylist *paramlist;
int mode;
keylist *filelist;
keyitem *curfile;
int curfd;
int diropen;
char * linkval;
int linkread;
} pg_plug_inst;
/*
* TODO:
* TODO: integrate pgsql-fd with pgsqllib
* TODO:
*/
/* size of different string or sql buffer */
#define SQLLEN 256
#define CONNSTRLEN 128
/* Assertions defines */
#define ASSERT_bfuncs \
if ( ! bfuncs ){ \
return bRC_Error; \
}
#define ASSERT_ctx \
if ( ! ctx ) { \
return bRC_Error; \
}
#define ASSERT_ctxp_RET_BRCERROR ASSERT_ctx_p
#define ASSERT_ctx_p \
if ( ! ctx || ! ctx->pContext ) { \
return bRC_Error; \
}
#define ASSERT_p(value) \
if ( ! value ){ \
return bRC_Error; \
}
#define ASSERT_n(value) \
if ( value ){ \
return bRC_Error; \
}
#define ASSERT_pex(value) \
if ( ! value ){ \
exit ( bRC_Error ); \
}
/* memory allocation/deallocation */
#define MALLOC(size) \
(char *) malloc ( size );
#define FREE(ptr) \
free ( ptr ); \
ptr = NULL;
/*
* TODO: extend with additional calls for Bareos-FD: bareosAddOptions
*/
#define JMSG0(ctx,type,msg) \
bfuncs->JobMessage ( ctx, __FILE__, __LINE__, type, 0, PLUGIN_INFO msg );
#define JMSG(ctx,type,msg,var) \
bfuncs->JobMessage ( ctx, __FILE__, __LINE__, type, 0, PLUGIN_INFO msg, var );
#define JMSG2(ctx,type,msg,var1,var2) \
bfuncs->JobMessage ( ctx, __FILE__, __LINE__, type, 0, PLUGIN_INFO msg, var1, var2 );
#define DMSG0(ctx,level,msg) \
bfuncs->DebugMessage ( ctx, __FILE__, __LINE__, level, PLUGIN_INFO msg );
#define DMSG1(ctx,level,msg,var) \
bfuncs->DebugMessage ( ctx, __FILE__, __LINE__, level, PLUGIN_INFO msg, var );
#define DMSG2(ctx,level,msg,var1,var2) \
bfuncs->DebugMessage ( ctx, __FILE__, __LINE__, level, PLUGIN_INFO msg, var1, var2 );
#define DMSG3(ctx,level,msg,var1,var2,var3) \
bfuncs->DebugMessage ( ctx, __FILE__, __LINE__, level, PLUGIN_INFO msg, var1, var2, var3 );
/* fixed debug level definitions */
#define D1 1
#define D2 10
#define D3 100
/* error in sql exec */
#define PGERROR(msg,sql,result,status) \
DMSG2 ( ctx, D1, "%s (%s)\n", msg, sql); \
JMSG2 ( ctx, M_ERROR, "%s (%s)\n", msg, sql); \
JMSG ( ctx, M_ERROR, "pg_res: %s\n", PQresStatus(status) ); \
JMSG ( ctx, M_ERROR, "pg_err: %s\n", PQresultErrorMessage(result) );
/*
* Plugin called here when it is first loaded
*/
bRC DLL_IMP_EXP loadPlugin(bInfo *lbinfo,
bFuncs *lbfuncs,
genpInfo **pinfo,
pFuncs **pfuncs)
{
bfuncs = lbfuncs; /* set Bareos funct pointers */
binfo = lbinfo;
printf ( PLUGIN_INFO "version %s %s (c) 2011 by Inteos\n", PLUGIN_VERSION, PLUGIN_DATE );
printf ( PLUGIN_INFO "connected to Bareos version %d\n", binfo->version );
*pinfo = &pluginInfo; /* return pointer to our info */
*pfuncs = &pluginFuncs; /* return pointer to our functions */
return bRC_OK;
}
/*
* Plugin called here when it is unloaded, normally when Bareos is going to exit.
*/
bRC unloadPlugin()
{
return bRC_OK;
}
/*
* Called here to make a new instance of the plugin -- i.e. when
* a new Job is started. There can be multiple instances of
* each plugin that are running at the same time. Your
* plugin instance must be thread safe and keep its own
* local data.
*/
static bRC newPlugin ( bpContext *ctx )
{
pg_plug_inst * pinst;
ASSERT_ctx;
pinst = (pg_plug_inst *) malloc ( sizeof( pg_plug_inst ) );
if ( pinst == NULL )
{
JMSG0 ( ctx, M_FATAL, "Error allocating plugin structures" );
return bRC_Error;
}
ctx->pContext = pinst;
/* initialize pinst contents */
memset ( pinst, 0, sizeof ( pg_plug_inst ) );
bfuncs->getBareosValue ( ctx, bVarJobId, (void *)&pinst->JobId );
DMSG1 ( ctx, D1, "newPlugin JobId=%d\n", pinst->JobId );
bfuncs->registerBareosEvents(ctx,
4,
bEventEndBackupJob,
bEventStartRestoreJob,
bEventRestoreCommand,
bEventBackupCommand);
return bRC_OK;
}
/*
* Release everything concerning a particular instance of a
* plugin. Normally called when the Job terminates.
*/
static bRC freePlugin ( bpContext *ctx )
{
int JobId = 0;
pg_plug_inst *pinst;
ASSERT_ctx_p;
pinst = (pg_plug_inst *) ctx->pContext;
ASSERT_bfuncs;
bfuncs->getBareosValue ( ctx, bVarJobId, (void *)&JobId );
if ( pinst->JobId != JobId )
{
JMSG0 ( ctx, M_ERROR, "freePlugin JobId mismatch" );
}
/* free pg_plug_inst private data */
PQfinish ( pinst->catdb );
if ( pinst->configfile )
FREE ( pinst->configfile );
keylist_free ( pinst->paramlist );
keylist_free ( pinst->filelist );
FREE ( pinst );
DMSG1 ( ctx, D2, "freePlugin JobId=%d\n", JobId );
return bRC_OK;
}
/*
* Called by core code to get a variable from the plugin.
* Not currently used.
*/
static bRC getPluginValue ( bpContext *ctx, pVariable var, void *value )
{
DMSG0 ( ctx, D3, "getPluginValue called.\n" );
return bRC_OK;
}
/*
* Called by core code to set a plugin variable.
* Not currently used.
*/
static bRC setPluginValue ( bpContext *ctx, pVariable var, void *value )
{
DMSG0 ( ctx, D3, "setPluginValue called." );
return bRC_OK;
}
/*
* Parsing a plugin command.
*
* in:
* ctx - plugin context
* parse_mode - indicate if we parse for backup or restore
* command - plugin command string to parse
* out:
* ctx->pContext->configfile - name and path to config file
* ctx->pContext->mode - what we are doing (wal backup, db backup, db restore)
* ctx->pContext->paramlist - a list of parameters from config file
* bRC_OK - on success
* bRC_Error - on error
*/
bRC parse_plugin_command ( bpContext *ctx, const ParseMode parse_mode, const char * command )
{
/* pgsql:/usr/local/bareos/etc/pgsql.phobos.conf:[wal,db] */
char * s;
char * n;
pg_plug_inst * pinst;
int len;
ASSERT_ctx_p;
pinst = (pg_plug_inst *) ctx->pContext;
if ( ! ( pinst->restore_command_value != NULL &&
strncmp ( pinst->restore_command_value, command, strlen ( command ) ) == 0 ) ){
/* check for command correctness */
s = strchr ( (char *)command, ':' );
ASSERT_p ( s );
s++;
/* check for command correctness */
n = strchr ( s, ':' );
ASSERT_p ( n );
ASSERT_bfuncs;
/*
* s points to begin of the config file name, n points into last ':' sign
* len indicate a length of config file name
*/
len = n - s;
/* if configfile was allocated then free it */
if ( pinst->configfile ){
FREE ( pinst->configfile );
}
if ( pinst->restore_command_value ){
FREE ( pinst->restore_command_value );
}
if ( pinst->paramlist ){
keylist_free ( pinst->paramlist );
}
/* new configfile allocation */
pinst->configfile = MALLOC ( len + 1 );
ASSERT_p ( pinst->configfile );
/* copy config filename from plugin command */
strncpy ( pinst->configfile, s, len );
/* terminate config filename with null */
pinst->configfile [len] = 0;
n++;
/* search for command/mode setting */
if ( ! strncasecmp ( n, "wal", 3 ) ){
if ( parse_mode == PARSE_BACKUP )
pinst->mode = PGSQL_ARCH_BACKUP;
else
if ( parse_mode == PARSE_RESTORE )
pinst->mode = PGSQL_ARCH_RESTORE;
} else
if ( ! strncasecmp ( n, "db", 2 ) ){
if ( parse_mode == PARSE_BACKUP )
pinst->mode = PGSQL_DB_BACKUP;
else
if ( parse_mode == PARSE_RESTORE )
pinst->mode = PGSQL_DB_RESTORE;
} else {
/* unknown plugin command */
FREE ( pinst->configfile );
return bRC_Error;
}
if((pinst->paramlist = parse_config_file ( pinst->configfile )) == NULL) {
char errbuf[255];
JMSG2(ctx, M_FATAL, "Error reading config file: %s (%s)", pinst->configfile,
strerror_r(errno, errbuf, sizeof(errbuf)));
FREE( pinst->configfile );
return bRC_Error;
}
pinst->restore_command_value = bstrdup ( command );
}
return bRC_OK;
}
/*
* connect to pgsql catalog database
*
* in:
* ctx - plugin context
* out:
* ctx->pContext->catdb - working catalog connection
* 0 - on success
* 1 - on error
*/
bRC catdbconnect ( bpContext *ctx ){
char * catdbconnstring;
ConnStatusType status;
pg_plug_inst * pinst;
ASSERT_ctx_p;
pinst = (pg_plug_inst *)ctx->pContext;
catdbconnstring = MALLOC ( CONNSTRLEN );
ASSERT_p ( catdbconnstring );
snprintf ( catdbconnstring, CONNSTRLEN, "host=%s port=%s dbname=%s user=%s password=%s",
search_key ( pinst->paramlist, "CATDBHOST" ),
search_key ( pinst->paramlist, "CATDBPORT" ),
search_key ( pinst->paramlist, "CATDB" ),
search_key ( pinst->paramlist, "CATUSER" ),
search_key ( pinst->paramlist, "CATPASSWD" ));
pinst->catdb = PQconnectdb ( catdbconnstring );
FREE ( catdbconnstring );
status = PQstatus ( pinst->catdb );
if ( status == CONNECTION_BAD ){
return bRC_Error;
}
return bRC_OK;
}
/*
* perform an internal connection to the database in separate process and execute sql
* statement
*
* in:
* sql - SQL statement
* out:
* bRC_OK - OK
* bRC_ERROR - Error
* bRC_More -
*/
bRC pg_internal_conn ( bpContext *ctx, const char * sql ){
PGconn * db;
ConnStatusType status;
ExecStatusType resstatus;
PGresult * result;
int pid = 0;
struct stat st;
uid_t pguid;
int err;
char connstring[CONNSTRLEN];
pg_plug_inst * pinst;
int exitstatus = 0;
/* check input data */
ASSERT_ctx_p;
pinst = (pg_plug_inst *)ctx->pContext;
/* dynamic production database owner verification, we use it do connect to production
* database. Required PGDATA from config file */
ASSERT_p ( pinst->paramlist );
err = stat ( search_key ( pinst->paramlist, "PGDATA" ) , &st );
if ( err ){
/* error, invalid PGDATA in config file */
JMSG0 ( ctx, M_ERROR, "invalid 'PGDATA' variable in config file." );
return bRC_Error;
}
/* we will fork to the owner of PGDATA database cluster */
pguid = st.st_uid;
/* switch pg xlog in different process, so make a fork */
/*
* TODO: test if switching is possible only with seteuid to postgres and return to root after that
* it was possible with pg_ctl shutdown ... but what about possible security flaw?
*/
pid = fork ();
if ( pid == 0 ){
DMSG0 ( ctx, D3, "forked process\n" );
/* sleep used for debuging forked process in gdb */
// sleep ( 60 );
/* we are in forked process, do a real job */
/* switch to pgcluster owner (postgres) */
err = seteuid ( pguid );
if ( err ){
/* error switching uid, report a problem */
/* TODO: add an errorlog display */
JMSG ( ctx, M_ERROR, "seteuid to uid=%i failed!\n", pguid );
exit (bRC_Error);
}
/* host is a socket directory, port is a socket 'port', we perform an 'internal'
* connection through a postgresql socket, which is required by plugin
* it require in pg_hba.conf a following line:
* local all postgres trust
* without it internall connection will not work */
snprintf ( connstring, CONNSTRLEN, "host=%s port=%s",
search_key ( pinst->paramlist, "PGHOST" ),
search_key ( pinst->paramlist, "PGPORT" ) );
db = PQconnectdb ( connstring );
status = PQstatus ( db );
if ( status == CONNECTION_BAD ){
DMSG0 ( ctx, D1, "pg_internal_conn.conndb failed!\n" );
JMSG0 ( ctx, M_WARNING, "pg_internal_conn.conndb failed!\n" );
/* not all goes ok so we have to raise it, but it is not a critical error,
* it should be handled by calling function */
exit (bRC_More);
}
/* we have a successful production database connection, so execute sql */
result = PQexec ( db, sql );
resstatus = PQresultStatus ( result );
if ( !(resstatus == PGRES_TUPLES_OK || resstatus == PGRES_COMMAND_OK) ){
/* TODO: add an errorlog display */
PGERROR ("pg_internal_conn.pqexec failed!", sql, result, resstatus);
exit (bRC_Error);
}
/* finish database connection */
PQfinish ( db );
/* finish forked process */
exit (bRC_OK);
} else {
/* we are waiting for background process to finish */
waitpid ( pid, &exitstatus, 0 );
}
/* XXX: we should check for forked process exit status */
DMSG1 ( ctx, D2, "pg_internal_conn.exit: %i\n", WEXITSTATUS( exitstatus ) );
return (bRC) WEXITSTATUS( exitstatus );
}
/*
* it makes a connection to production database in separate process and perform a
* transaction log switching
*/
bRC switch_pg_xlog ( bpContext *ctx ){
bRC err;
err = pg_internal_conn ( ctx, "select pg_switch_xlog()" );
if ( err == bRC_OK ) {
/* wait a few seconds to switch log to finish
* FIXME: we have to consider how to perform interprocess synchronization
* one of the option is to use message passing (pgsql_msg_send,pgsql_msg_recv) */
DMSG0 ( ctx, D3, "waiting for switch log");
sleep ( 3 );
DMSG0 ( ctx, D3, "waiting finish");
} else
if ( err == bRC_More ){
/* we have got a connection error for log switching, possibly database temporary unavailable
* maintanance shutdown? */
JMSG0 ( ctx, M_INFO, "switch log failed. Current wal wasn't archived\n" );
err = bRC_OK;
}
return err;
}
/*
* start backup procedure
*
* in:
* ctx - plugin context
* out:
* bRC_OK - success
* bRC_Error - error
*/
bRC start_pg_backup ( bpContext *ctx ){
pg_plug_inst * pinst;
char * sql;
bRC err = bRC_OK;
/* check input data */
ASSERT_ctx_p;
pinst = (pg_plug_inst *)ctx->pContext;
sql = MALLOC ( SQLLEN );
ASSERT_p ( sql );
#if 0
/* catalog database connection */
err = catdbconnect ( ctx );
if ( err ){
return bRC_Error;
}
/* insert status in catalog */
snprintf ( sql, SQLLEN, "insert into pgsql_pgsql_backupdbs (client, status, blevel) values ('%s', '%i', '%i')",
search_key ( pdata->paramlist, "ARCHCLIENT" ),
status, 0 );
result = PQexec ( pdata->catdb, sql );
FREE ( sql );
if ( PQresultStatus ( result ) != PGRES_COMMAND_OK ){
abortprg ( pdata, EXITCATDBEINS, "CATDB: SQL insert error!" );
}
pgid = get_walid_from_catalog ( pdata );
#endif
snprintf ( sql, SQLLEN, "select pg_start_backup ('%s:%i')",
search_key ( pinst->paramlist, "ARCHCLIENT" ),
pinst->JobId );
err = pg_internal_conn ( ctx, sql );
/* error database connection in this case it is a problem,
* rise en error for calling function */
if ( err == bRC_More )
err = bRC_Error;
FREE ( sql );
return err;
}
/*
* end backup procedure
*
* in:
* ctx - plugin context
* out:
* bRC_OK - success
* bRC_Error - error
*/
bRC stop_pg_backup ( bpContext *ctx ){
bRC err = bRC_OK;
err = pg_internal_conn ( ctx, "select pg_stop_backup ()" );
/* error database connection in this case it is a problem,
* rise en error for calling function */
if ( err == bRC_More )
err = bRC_Error;
return err;
}
/*
* grab an arhivelogs list for backup
*
* in:
* ctx - plugin context
* out:
* bRC_OK - success
* bRC_Error - error
*/
bRC get_wal_list ( bpContext *ctx ){
PGresult * result;
char * sql;
pg_plug_inst * pinst;
char * filename;
char * pgid;
int nr;
ExecStatusType resstatus;
ASSERT_ctx_p;
pinst = (pg_plug_inst *)ctx->pContext;
ASSERT_p ( pinst->paramlist );
sql = MALLOC ( SQLLEN );
ASSERT_p ( sql );
/* PGSQL_STATUS_WAL_ARCH_FINISH, PGSQL_STATUS_WAL_ARCH_MULTI */
snprintf ( sql, SQLLEN, "select * from pgsql_archivelogs where client='%s' and status in (3,5) order by mod_date",
search_key ( pinst->paramlist, "ARCHCLIENT" ) );
result = PQexec ( pinst->catdb, sql );
resstatus = PQresultStatus ( result );
if ( resstatus != PGRES_TUPLES_OK ){
PGERROR ( "get_wal_list.pqexec failed!", sql, result, resstatus );
return bRC_Error;
}
// FREE ( sql );
nr = PQntuples ( result );
if ( nr ){
for (int a = 0; a < nr; a++ ){
pgid = (char *) PQgetvalue ( result, a, PQfnumber ( result, "id") );
filename = (char *) PQgetvalue ( result, a, PQfnumber ( result, "filename") );
pinst->filelist = add_keylist ( pinst->filelist, pgid, filename );
}
/* first node of the list will be our current file for backup */
pinst->curfile = (keyitem *)pinst->filelist->first();
//print_keylist ( pinst->filelist );
} else {
/* no files to backup, startBackupFile will fill required structs */
pinst->filelist = NULL;
pinst->curfile = NULL;
}
return bRC_OK;
}
/*
* function performs pg_tblspc directory analyzis in case of defined tablespaces - symbolic links
* into a directories where a tablespaces are located. we have to insert both: pg_tblspc directory
* with links and tablespaces location directories.
*
* pg_tblspc directory and its links will have a pgsqldb namespace but every tablespace location
* will have a pgsqltbs namespace instead
*
* for PostgreSQL version 9.x we have to handle a different tablespace directory hierarchy
* postgres version is not discovered currently and we hanle it through PGVERSION parameter
*
* in:
* ctx - plugin context
* list - current filename list
* base - indicate if filename path is relative or absolute
* '$ROOT$' - path is absolute, no need to concatenate both
* other => absolute filename path = $base/$path
* path - filename path (file or directory)
* out:
* list - updated filename list
*/
keylist * get_tablespace_dir ( bpContext * ctx, keylist * list, const char * base, const char * path )
{
DIR * dirp_tab;
DIR * dirp_tablink;
char * bpath = NULL;
char * link = NULL;
keylist * nlist = list;
struct dirent * filedir_tab;
struct dirent * filedir_tablink;
int dl;
char * pgver;
pg_plug_inst * pinst;
pinst = (pg_plug_inst *)ctx->pContext;
DMSG1 ( ctx, D2, "perform tablespace dir at: %s/pg_tblspc\n", base );
/* we add to the file list a contents of tablespace directory pg_tplspc at
* pgsqldb namespace */
nlist = get_file_list ( ctx, nlist, base, "pg_tblspc" );
/* most important variable allocation on heap */
bpath = MALLOC ( PATH_MAX );
if ( ! bpath ){
JMSG0 ( ctx, M_ERROR, "error allocating memory." );
return list;
}
/* building absolute path into a tablespaces directory for symbolic links analyzis */
snprintf ( bpath, PATH_MAX, "%s/pg_tblspc/", base );
dirp_tab = opendir ( bpath );
if ( !dirp_tab ){
JMSG ( ctx, M_ERROR, "error opening dir: %s", bpath );
FREE ( bpath );
return nlist;
}
/* all tablespaces locations are symbolic links */
while ( (filedir_tab = readdir ( dirp_tab )) ){
if ( strcmp ( filedir_tab->d_name, "." ) != 0 &&
strcmp ( filedir_tab->d_name, ".." ) != 0 ){
DMSG1 ( ctx, D2, "tablespace found: %s\n", filedir_tab->d_name );
link = MALLOC ( PATH_MAX );
if ( ! link ){
JMSG0 ( ctx, M_ERROR, "error allocating memory." );
FREE ( bpath );
return nlist;
}
/* building absolute path into a links */
snprintf ( bpath, PATH_MAX, "%s/pg_tblspc/%s", base, filedir_tab->d_name );
/* get a link contents */
dl = readlink ( bpath, link, PATH_MAX - 1 );
if ( dl < 0 ){
JMSG ( ctx, M_ERROR, "error reading link: %s", strerror ( errno ) );
FREE ( bpath );
FREE ( link );
closedir ( dirp_tab );
return nlist;
}
link [ dl ] = 0;
DMSG2 ( ctx, D3, "symlink dl=%i %s\n", dl, link );
/* check if a link is absolute or not */
if ( link [ 0 ] == '/' ){
/* absolute - it is good */
strncpy ( bpath, link, PATH_MAX );
} else {
/* according to PostgreSQL a tablespace location has to be an absolute,
* if not we have an error, raise it. */
JMSG0 ( ctx, M_ERROR, "Relative link Error!" );
FREE ( bpath );
FREE ( link );
closedir ( dirp_tab );
return nlist;
}
/* all tablespaces are backuped with absolute path */
realpath ( bpath, link );
pgver = search_key ( pinst->paramlist, "PGVERSION" );
if ( !pgver || strcmp ( pgver, "8.x" ) == 0 ){
/* PostgreSQL 8.x */
DMSG0(ctx, D3, "PGVERSION=8.x\n");
nlist = get_file_list ( ctx, nlist, "$ROOT$", link );
} else
if ( strcmp (pgver, "9.x") == 0){
/* PostgreSQL 9.x */
dirp_tablink = opendir ( link );
if ( !dirp_tablink ){
JMSG ( ctx, M_ERROR, "error opening dir: %s", bpath );
FREE ( bpath );
FREE ( link );
return nlist;
}
while ( (filedir_tablink = readdir ( dirp_tablink )) ){
if ( strcmp ( filedir_tablink->d_name, "." ) != 0 &&
strcmp ( filedir_tablink->d_name, ".." ) != 0 ){
if ( strncmp ( filedir_tablink->d_name, "PG_9.", 5 ) == 0){
DMSG0(ctx, D3, "PGVERSION=9.x\n");
snprintf ( bpath, PATH_MAX, "%s/%s", link, filedir_tablink->d_name );
DMSG1(ctx,D3,"->%s\n",bpath);
nlist = get_file_list ( ctx, nlist, "$ROOT$", bpath );
}
}
}
/* end postgres 9.x */
} else {
JMSG ( ctx, M_ERROR, "unsupported PostgreSQL version: %s",pgver);
FREE ( bpath );
FREE ( link );
return nlist;
}
FREE ( link );
}
}
closedir ( dirp_tab );
DMSG0 ( ctx, D2, "end perform tablespace\n" );
return nlist;
}
/*
* adds a directory entry into a filename list
*
* in:
* ctx - plugin context
* list - current filename list
* base - indicate if filename path is relative or absolute
* '$ROOT$' - path is absolute, no need to concatenate both
* other => absolute filename path = $base/$path
* path - filename path (file or directory)
* direntry -
* out:
* list - updated filename list
*/
keylist * get_dir_content ( bpContext *ctx, keylist * list, const char * base, const char * path, char * direntry ){
char * npath = NULL;
keylist * nlist = list;
int plen = strlen ( path );
npath = MALLOC ( PATH_MAX );
if ( ! npath ){
JMSG0 ( ctx, M_ERROR, "error allocating memory." );
return nlist;
}
/* XXX: required fix, we concatenate directory content with relative path into npath */
snprintf ( npath, PATH_MAX, plen ? "%s/%s" : "%s%s",
path, direntry );
if ( strcmp ( direntry, "pg_xlog" ) == 0 ){
/* we have to add pg_xlog and pg_xlog/archive_status directories into a list but
* without its contents */
int len = strlen ( npath );
npath [ len ] = '/';
npath [ len + 1 ] = '\0';
nlist = add_keylist_attr ( nlist, base, npath, PG_DIR );
snprintf ( npath, PATH_MAX, "%s%s/archive_status", path, direntry );
nlist = add_keylist_attr ( nlist, base, npath, PG_DIR );
} else {
/* recursive add a file/directory */
nlist = get_file_list ( ctx, nlist, base, npath );
}
FREE ( npath );
return nlist;
}
/*
* adds a dir filetype into a files list
*
* in:
* ctx - plugin context
* list - current filename list
* base - indicate if filename path is relative or absolute
* '$ROOT$' - path is absolute, no need to concatenate both
* other => absolute filename path = $base/$path
* path - filename path (file or directory)
* bpath - absolute path
* out:
* list - updated filename list
*/
keylist * add_dir_list ( bpContext *ctx, keylist * list, const char * base, const char * path, char * bpath ){
char * npath = NULL;
keylist * nlist = list;
int plen = strlen ( path );