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dbutils.c
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dbutils.c
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/*
* dbutils.c - Database connection/management functions
*
* Copyright (c) EnterpriseDB Corporation, 2010-2021
*
*
* 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <dirent.h>
#include <arpa/inet.h>
#include "repmgr.h"
#include "dbutils.h"
#include "controldata.h"
#include "dirutil.h"
#define NODE_RECORD_PARAM_COUNT 11
static void log_db_error(PGconn *conn, const char *query_text, const char *fmt,...)
__attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
static bool _is_server_available(const char *conninfo, bool quiet);
static PGconn *_establish_db_connection(const char *conninfo,
const bool exit_on_error,
const bool log_notice,
const bool verbose_only);
static PGconn * _establish_replication_connection_from_params(PGconn *conn, const char *conninfo, const char *repluser);
static PGconn *_get_primary_connection(PGconn *standby_conn, int *primary_id, char *primary_conninfo_out, bool quiet);
static bool _set_config(PGconn *conn, const char *config_param, const char *sqlquery);
static bool _get_pg_setting(PGconn *conn, const char *setting, char *str_output, bool *bool_output, int *int_output);
static RecordStatus _get_node_record(PGconn *conn, char *sqlquery, t_node_info *node_info, bool init_defaults);
static void _populate_node_record(PGresult *res, t_node_info *node_info, int row, bool init_defaults);
static void _populate_node_records(PGresult *res, NodeInfoList *node_list);
static bool _create_update_node_record(PGconn *conn, char *action, t_node_info *node_info);
static ReplSlotStatus _verify_replication_slot(PGconn *conn, char *slot_name, PQExpBufferData *error_msg);
static bool _create_event(PGconn *conn, t_configuration_options *options, int node_id, char *event, bool successful, char *details, t_event_info *event_info, bool send_notification);
static NodeAttached _is_downstream_node_attached(PGconn *conn, char *node_name, char **node_state, bool quiet);
/*
* This provides a standardized way of logging database errors. Note
* that the provided PGconn can be a normal or a replication connection;
* no attempt is made to write to the database, only to report the output
* of PQerrorMessage().
*/
void
log_db_error(PGconn *conn, const char *query_text, const char *fmt,...)
{
va_list ap;
char buf[MAXLEN];
int retval;
va_start(ap, fmt);
retval = vsnprintf(buf, MAXLEN, fmt, ap);
va_end(ap);
if (retval < MAXLEN)
log_error("%s", buf);
if (conn != NULL)
{
log_detail("\n%s", PQerrorMessage(conn));
}
if (query_text != NULL)
{
log_detail("query text is:\n%s", query_text);
}
}
/* ================= */
/* utility functions */
/* ================= */
XLogRecPtr
parse_lsn(const char *str)
{
XLogRecPtr ptr = InvalidXLogRecPtr;
uint32 high,
low;
if (sscanf(str, "%x/%x", &high, &low) == 2)
ptr = (((XLogRecPtr) high) << 32) + (XLogRecPtr) low;
return ptr;
}
/* ==================== */
/* Connection functions */
/* ==================== */
/*
* _establish_db_connection()
*
* Connect to a database using a conninfo string.
*
* NOTE: *do not* use this for replication connections; instead use:
* establish_db_connection_by_params()
*/
static PGconn *
_establish_db_connection(const char *conninfo, const bool exit_on_error, const bool log_notice, const bool verbose_only)
{
PGconn *conn = NULL;
char *connection_string = NULL;
char *errmsg = NULL;
t_conninfo_param_list conninfo_params = T_CONNINFO_PARAM_LIST_INITIALIZER;
bool is_replication_connection = false;
bool parse_success = false;
initialize_conninfo_params(&conninfo_params, false);
parse_success = parse_conninfo_string(conninfo, &conninfo_params, &errmsg, false);
if (parse_success == false)
{
log_error(_("unable to parse provided conninfo string \"%s\""), conninfo);
log_detail("%s", errmsg);
free_conninfo_params(&conninfo_params);
return NULL;
}
/* set some default values if not explicitly provided */
param_set_ine(&conninfo_params, "connect_timeout", "2");
param_set_ine(&conninfo_params, "fallback_application_name", "repmgr");
if (param_get(&conninfo_params, "replication") != NULL)
is_replication_connection = true;
/* use a secure search_path */
param_set(&conninfo_params, "options", "-csearch_path=");
connection_string = param_list_to_string(&conninfo_params);
log_debug(_("connecting to: \"%s\""), connection_string);
conn = PQconnectdb(connection_string);
/* Check to see that the backend connection was successfully made */
if ((PQstatus(conn) != CONNECTION_OK))
{
bool emit_log = true;
if (verbose_only == true && verbose_logging == false)
emit_log = false;
if (emit_log)
{
if (log_notice)
{
log_notice(_("connection to database failed"));
log_detail("\n%s", PQerrorMessage(conn));
}
else
{
log_error(_("connection to database failed"));
log_detail("\n%s", PQerrorMessage(conn));
}
log_detail(_("attempted to connect using:\n %s"),
connection_string);
}
if (exit_on_error)
{
PQfinish(conn);
free_conninfo_params(&conninfo_params);
exit(ERR_DB_CONN);
}
}
/*
* set "synchronous_commit" to "local" in case synchronous replication is
* in use
*
* XXX set this explicitly before any write operations
*/
else if (is_replication_connection == false &&
set_config(conn, "synchronous_commit", "local") == false)
{
if (exit_on_error)
{
PQfinish(conn);
free_conninfo_params(&conninfo_params);
exit(ERR_DB_CONN);
}
}
pfree(connection_string);
free_conninfo_params(&conninfo_params);
return conn;
}
/*
* Establish a database connection, optionally exit on error
*/
PGconn *
establish_db_connection(const char *conninfo, const bool exit_on_error)
{
return _establish_db_connection(conninfo, exit_on_error, false, false);
}
/*
* Attempt to establish a database connection, never exit on error, only
* output error messages if --verbose option used
*/
PGconn *
establish_db_connection_quiet(const char *conninfo)
{
return _establish_db_connection(conninfo, false, false, true);
}
PGconn *
establish_db_connection_with_replacement_param(const char *conninfo,
const char *param,
const char *value,
const bool exit_on_error)
{
t_conninfo_param_list node_conninfo = T_CONNINFO_PARAM_LIST_INITIALIZER;
char *errmsg = NULL;
bool parse_success = false;
PGconn *conn = NULL;
initialize_conninfo_params(&node_conninfo, false);
parse_success = parse_conninfo_string(conninfo,
&node_conninfo,
&errmsg, false);
if (parse_success == false)
{
log_error(_("unable to parse conninfo string \"%s\" for local node"),
conninfo);
log_detail("%s", errmsg);
if (exit_on_error == true)
exit(ERR_BAD_CONFIG);
return NULL;
}
param_set(&node_conninfo,
param,
value);
conn = establish_db_connection_by_params(&node_conninfo, exit_on_error);
free_conninfo_params(&node_conninfo);
return conn;
}
PGconn *
establish_primary_db_connection(PGconn *conn,
const bool exit_on_error)
{
t_node_info primary_node_info = T_NODE_INFO_INITIALIZER;
bool primary_record_found = get_primary_node_record(conn, &primary_node_info);
if (primary_record_found == false)
{
return NULL;
}
return establish_db_connection(primary_node_info.conninfo,
exit_on_error);
}
PGconn *
establish_db_connection_by_params(t_conninfo_param_list *param_list,
const bool exit_on_error)
{
PGconn *conn = NULL;
/* set some default values if not explicitly provided */
param_set_ine(param_list, "connect_timeout", "2");
param_set_ine(param_list, "fallback_application_name", "repmgr");
/* use a secure search_path */
param_set(param_list, "options", "-csearch_path=");
/* Connect to the database using the provided parameters */
conn = PQconnectdbParams((const char **) param_list->keywords, (const char **) param_list->values, true);
/* Check to see that the backend connection was successfully made */
if ((PQstatus(conn) != CONNECTION_OK))
{
log_error(_("connection to database failed"));
log_detail("\n%s", PQerrorMessage(conn));
if (exit_on_error)
{
PQfinish(conn);
exit(ERR_DB_CONN);
}
}
else
{
bool is_replication_connection = false;
int i;
/*
* set "synchronous_commit" to "local" in case synchronous replication
* is in use (provided this is not a replication connection)
*/
for (i = 0; param_list->keywords[i]; i++)
{
if (strcmp(param_list->keywords[i], "replication") == 0)
is_replication_connection = true;
}
if (is_replication_connection == false && set_config(conn, "synchronous_commit", "local") == false)
{
if (exit_on_error)
{
PQfinish(conn);
exit(ERR_DB_CONN);
}
}
}
return conn;
}
/*
* Given an existing active connection and the name of a replication
* user, extract the connection parameters from that connection and
* attempt to return a replication connection.
*/
PGconn *
establish_replication_connection_from_conn(PGconn *conn, const char *repluser)
{
return _establish_replication_connection_from_params(conn, NULL, repluser);
}
PGconn *
establish_replication_connection_from_conninfo(const char *conninfo, const char *repluser)
{
return _establish_replication_connection_from_params(NULL, conninfo, repluser);
}
static PGconn *
_establish_replication_connection_from_params(PGconn *conn, const char *conninfo, const char *repluser)
{
t_conninfo_param_list repl_conninfo = T_CONNINFO_PARAM_LIST_INITIALIZER;
PGconn *repl_conn = NULL;
initialize_conninfo_params(&repl_conninfo, false);
if (conn != NULL)
conn_to_param_list(conn, &repl_conninfo);
else if (conninfo != NULL)
parse_conninfo_string(conninfo, &repl_conninfo, NULL, false);
/* Set the provided replication user */
param_set(&repl_conninfo, "user", repluser);
param_set(&repl_conninfo, "replication", "1");
param_set(&repl_conninfo, "dbname", "replication");
repl_conn = establish_db_connection_by_params(&repl_conninfo, false);
free_conninfo_params(&repl_conninfo);
return repl_conn;
}
PGconn *
get_primary_connection(PGconn *conn,
int *primary_id, char *primary_conninfo_out)
{
return _get_primary_connection(conn, primary_id, primary_conninfo_out, false);
}
PGconn *
get_primary_connection_quiet(PGconn *conn,
int *primary_id, char *primary_conninfo_out)
{
return _get_primary_connection(conn, primary_id, primary_conninfo_out, true);
}
PGconn *
duplicate_connection(PGconn *conn, const char *user, bool replication)
{
t_conninfo_param_list conninfo = T_CONNINFO_PARAM_LIST_INITIALIZER;
PGconn *duplicate_conn = NULL;
initialize_conninfo_params(&conninfo, false);
conn_to_param_list(conn, &conninfo);
if (user != NULL)
param_set(&conninfo, "user", user);
if (replication == true)
param_set(&conninfo, "replication", "1");
duplicate_conn = establish_db_connection_by_params(&conninfo, false);
free_conninfo_params(&conninfo);
return duplicate_conn;
}
void
close_connection(PGconn **conn)
{
if (*conn == NULL)
return;
PQfinish(*conn);
*conn = NULL;
}
/* =============================== */
/* conninfo manipulation functions */
/* =============================== */
/*
* get_conninfo_value()
*
* Extract the value represented by 'keyword' in 'conninfo' and copy
* it to the 'output' buffer.
*
* Returns true on success, or false on failure (conninfo string could
* not be parsed, or provided keyword not found).
*/
bool
get_conninfo_value(const char *conninfo, const char *keyword, char *output)
{
PQconninfoOption *conninfo_options = NULL;
PQconninfoOption *conninfo_option = NULL;
conninfo_options = PQconninfoParse(conninfo, NULL);
if (conninfo_options == NULL)
{
log_error(_("unable to parse provided conninfo string \"%s\""), conninfo);
return false;
}
for (conninfo_option = conninfo_options; conninfo_option->keyword != NULL; conninfo_option++)
{
if (strcmp(conninfo_option->keyword, keyword) == 0)
{
if (conninfo_option->val != NULL && conninfo_option->val[0] != '\0')
{
strncpy(output, conninfo_option->val, MAXLEN);
break;
}
}
}
PQconninfoFree(conninfo_options);
return true;
}
/*
* Get a default conninfo value for the provided parameter, and copy
* it to the 'output' buffer.
*
* Returns true on success, or false on failure (provided keyword not found).
*
*/
bool
get_conninfo_default_value(const char *param, char *output, int maxlen)
{
PQconninfoOption *defs = NULL;
PQconninfoOption *def = NULL;
bool found = false;
defs = PQconndefaults();
for (def = defs; def->keyword; def++)
{
if (strncmp(def->keyword, param, maxlen) == 0)
{
strncpy(output, def->val, maxlen);
found = true;
}
}
PQconninfoFree(defs);
return found;
}
void
initialize_conninfo_params(t_conninfo_param_list *param_list, bool set_defaults)
{
PQconninfoOption *defs = NULL;
PQconninfoOption *def = NULL;
int c;
defs = PQconndefaults();
param_list->size = 0;
/* Count maximum number of parameters */
for (def = defs; def->keyword; def++)
param_list->size++;
/* Initialize our internal parameter list */
param_list->keywords = pg_malloc0(sizeof(char *) * (param_list->size + 1));
param_list->values = pg_malloc0(sizeof(char *) * (param_list->size + 1));
for (c = 0; c < param_list->size; c++)
{
param_list->keywords[c] = NULL;
param_list->values[c] = NULL;
}
if (set_defaults == true)
{
/* Pre-set any defaults */
for (def = defs; def->keyword; def++)
{
if (def->val != NULL && def->val[0] != '\0')
{
param_set(param_list, def->keyword, def->val);
}
}
}
PQconninfoFree(defs);
}
void
free_conninfo_params(t_conninfo_param_list *param_list)
{
int c;
for (c = 0; c < param_list->size; c++)
{
if (param_list->keywords != NULL && param_list->keywords[c] != NULL)
pfree(param_list->keywords[c]);
if (param_list->values != NULL && param_list->values[c] != NULL)
pfree(param_list->values[c]);
}
if (param_list->keywords != NULL)
pfree(param_list->keywords);
if (param_list->values != NULL)
pfree(param_list->values);
}
void
copy_conninfo_params(t_conninfo_param_list *dest_list, t_conninfo_param_list *source_list)
{
int c;
for (c = 0; c < source_list->size && source_list->keywords[c] != NULL; c++)
{
if (source_list->values[c] != NULL && source_list->values[c][0] != '\0')
{
param_set(dest_list, source_list->keywords[c], source_list->values[c]);
}
}
}
void
param_set(t_conninfo_param_list *param_list, const char *param, const char *value)
{
int c;
int value_len = strlen(value) + 1;
int param_len;
/*
* Scan array to see if the parameter is already set - if not, replace it
*/
for (c = 0; c < param_list->size && param_list->keywords[c] != NULL; c++)
{
if (strcmp(param_list->keywords[c], param) == 0)
{
if (param_list->values[c] != NULL)
pfree(param_list->values[c]);
param_list->values[c] = pg_malloc0(value_len);
strncpy(param_list->values[c], value, value_len);
return;
}
}
/*
* Sanity-check that the caller is not trying to overflow the array;
* in practice this is highly unlikely, and if it ever happens, this means
* something is highly wrong.
*/
Assert(c < param_list->size);
/*
* Parameter not in array - add it and its associated value
*/
param_len = strlen(param) + 1;
param_list->keywords[c] = pg_malloc0(param_len);
param_list->values[c] = pg_malloc0(value_len);
strncpy(param_list->keywords[c], param, param_len);
strncpy(param_list->values[c], value, value_len);
}
/*
* Like param_set(), but will only set the parameter if it doesn't exist
*/
void
param_set_ine(t_conninfo_param_list *param_list, const char *param, const char *value)
{
int c;
int value_len = strlen(value) + 1;
int param_len;
/*
* Scan array to see if the parameter is already set - if so, do nothing
*/
for (c = 0; c < param_list->size && param_list->keywords[c] != NULL; c++)
{
if (strcmp(param_list->keywords[c], param) == 0)
{
/* parameter exists, do nothing */
return;
}
}
/*
* Sanity-check that the caller is not trying to overflow the array;
* in practice this is highly unlikely, and if it ever happens, this means
* something is highly wrong.
*/
Assert(c < param_list->size);
/*
* Parameter not in array - add it and its associated value
*/
param_len = strlen(param) + 1;
param_list->keywords[c] = pg_malloc0(param_len);
param_list->values[c] = pg_malloc0(value_len);
strncpy(param_list->keywords[c], param, param_len);
strncpy(param_list->values[c], value, value_len);
}
char *
param_get(t_conninfo_param_list *param_list, const char *param)
{
int c;
for (c = 0; c < param_list->size && param_list->keywords[c] != NULL; c++)
{
if (strcmp(param_list->keywords[c], param) == 0)
{
if (param_list->values[c] != NULL && param_list->values[c][0] != '\0')
return param_list->values[c];
else
return NULL;
}
}
return NULL;
}
/*
* Validate a conninfo string by attempting to parse it.
*
* "errmsg": passed to PQconninfoParse(), may be NULL
*
* NOTE: PQconninfoParse() verifies the string format and checks for
* valid options but does not sanity check values.
*/
bool
validate_conninfo_string(const char *conninfo_str, char **errmsg)
{
PQconninfoOption *connOptions = NULL;
connOptions = PQconninfoParse(conninfo_str, errmsg);
if (connOptions == NULL)
return false;
PQconninfoFree(connOptions);
return true;
}
/*
* Parse a conninfo string into a t_conninfo_param_list
*
* See conn_to_param_list() to do the same for a PGconn.
*
* "errmsg": passed to PQconninfoParse(), may be NULL
*
* "ignore_local_params": ignores those parameters specific
* to a local installation, i.e. when parsing an upstream
* node's conninfo string for inclusion into "primary_conninfo",
* don't copy that node's values
*/
bool
parse_conninfo_string(const char *conninfo_str, t_conninfo_param_list *param_list, char **errmsg, bool ignore_local_params)
{
PQconninfoOption *connOptions = NULL;
PQconninfoOption *option = NULL;
connOptions = PQconninfoParse(conninfo_str, errmsg);
if (connOptions == NULL)
return false;
for (option = connOptions; option && option->keyword; option++)
{
/* Ignore non-set or blank parameter values */
if (option->val == NULL || option->val[0] == '\0')
continue;
/* Ignore settings specific to the upstream node */
if (ignore_local_params == true)
{
if (strcmp(option->keyword, "application_name") == 0)
continue;
if (strcmp(option->keyword, "passfile") == 0)
continue;
if (strcmp(option->keyword, "servicefile") == 0)
continue;
}
param_set(param_list, option->keyword, option->val);
}
PQconninfoFree(connOptions);
return true;
}
/*
* Parse a PGconn into a t_conninfo_param_list
*
* See parse_conninfo_string() to do the same for a conninfo string
*
* NOTE: the current use case for this is to take an active connection,
* replace the existing username (typically replacing it with the superuser
* or replication user name), and make a new connection as that user.
* If the "password" field is set, it will cause any connection made with
* these parameters to fail (unless of course the password happens to be the
* same). Therefore we remove the password altogether, and rely on it being
* available via .pgpass.
*/
void
conn_to_param_list(PGconn *conn, t_conninfo_param_list *param_list)
{
PQconninfoOption *connOptions = NULL;
PQconninfoOption *option = NULL;
connOptions = PQconninfo(conn);
for (option = connOptions; option && option->keyword; option++)
{
/* Ignore non-set or blank parameter values */
if (option->val == NULL || option->val[0] == '\0')
continue;
/* Ignore "password" */
if (strcmp(option->keyword, "password") == 0)
continue;
param_set(param_list, option->keyword, option->val);
}
PQconninfoFree(connOptions);
}
/*
* Converts param list to string; caller must free returned pointer
*/
char *
param_list_to_string(t_conninfo_param_list *param_list)
{
int c;
PQExpBufferData conninfo_buf;
char *conninfo_str = NULL;
int len = 0;
initPQExpBuffer(&conninfo_buf);
for (c = 0; c < param_list->size && param_list->keywords[c] != NULL; c++)
{
if (param_list->values[c] != NULL && param_list->values[c][0] != '\0')
{
if (c > 0)
appendPQExpBufferChar(&conninfo_buf, ' ');
/* XXX escape value */
appendPQExpBuffer(&conninfo_buf,
"%s=%s",
param_list->keywords[c],
param_list->values[c]);
}
}
len = strlen(conninfo_buf.data) + 1;
conninfo_str = pg_malloc0(len);
strncpy(conninfo_str, conninfo_buf.data, len);
termPQExpBuffer(&conninfo_buf);
return conninfo_str;
}
/*
* Run a conninfo string through the parser, and pass it back as a normal
* conninfo string. This is mainly intended for converting connection URIs
* to parameter/value conninfo strings.
*
* Caller must free returned pointer.
*/
char *
normalize_conninfo_string(const char *conninfo_str)
{
t_conninfo_param_list conninfo_params = T_CONNINFO_PARAM_LIST_INITIALIZER;
bool parse_success = false;
char *normalized_string = NULL;
char *errmsg = NULL;
initialize_conninfo_params(&conninfo_params, false);
parse_success = parse_conninfo_string(conninfo_str, &conninfo_params, &errmsg, false);
if (parse_success == false)
{
log_error(_("unable to parse provided conninfo string \"%s\""), conninfo_str);
log_detail("%s", errmsg);
free_conninfo_params(&conninfo_params);
return NULL;
}
normalized_string = param_list_to_string(&conninfo_params);
free_conninfo_params(&conninfo_params);
return normalized_string;
}
/*
* check whether the libpq version in use recognizes the "passfile" parameter
* (should be 9.6 and later)
*/
bool
has_passfile(void)
{
PQconninfoOption *defs = PQconndefaults();
PQconninfoOption *def = NULL;
bool has_passfile = false;
for (def = defs; def->keyword; def++)
{
if (strcmp(def->keyword, "passfile") == 0)
{
has_passfile = true;
break;
}
}
PQconninfoFree(defs);
return has_passfile;
}
/* ===================== */
/* transaction functions */
/* ===================== */
bool
begin_transaction(PGconn *conn)
{
PGresult *res = NULL;
log_verbose(LOG_DEBUG, "begin_transaction()");
res = PQexec(conn, "BEGIN");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
log_error(_("unable to begin transaction"));
log_detail("%s", PQerrorMessage(conn));
PQclear(res);
return false;
}
PQclear(res);
return true;
}
bool
commit_transaction(PGconn *conn)
{
PGresult *res = NULL;
log_verbose(LOG_DEBUG, "commit_transaction()");
res = PQexec(conn, "COMMIT");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
log_error(_("unable to commit transaction"));
log_detail("%s", PQerrorMessage(conn));
PQclear(res);
return false;
}
PQclear(res);
return true;
}
bool
rollback_transaction(PGconn *conn)
{
PGresult *res = NULL;
log_verbose(LOG_DEBUG, "rollback_transaction()");
res = PQexec(conn, "ROLLBACK");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
log_error(_("unable to rollback transaction"));
log_detail("%s", PQerrorMessage(conn));
PQclear(res);
return false;
}
PQclear(res);
return true;
}