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/*-------------------------------------------------------------------------
*
* streamutil.c - utility functions for pg_basebackup and pg_receivelog
*
* Author: Magnus Hagander <magnus@hagander.net>
*
* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/bin/pg_basebackup/streamutil.c
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include "streamutil.h"
#include <stdio.h>
#include <string.h>
const char *progname;
char *connection_string = NULL;
char *dbhost = NULL;
char *dbuser = NULL;
char *dbport = NULL;
int dbgetpassword = 0; /* 0=auto, -1=never, 1=always */
static char *dbpassword = NULL;
PGconn *conn = NULL;
/*
* Connect to the server. Returns a valid PGconn pointer if connected,
* or NULL on non-permanent error. On permanent error, the function will
* call exit(1) directly.
*/
PGconn *
GetConnection(void)
{
PGconn *tmpconn;
int argcount = 7; /* dbname, replication, fallback_app_name,
* host, user, port, password */
int i;
const char **keywords;
const char **values;
char *password = NULL;
const char *tmpparam;
PQconninfoOption *conn_opts = NULL;
PQconninfoOption *conn_opt;
char *err_msg = NULL;
/*
* Merge the connection info inputs given in form of connection string,
* options and default values (dbname=replication, replication=true, etc.)
*/
i = 0;
if (connection_string)
{
conn_opts = PQconninfoParse(connection_string, &err_msg);
if (conn_opts == NULL)
{
fprintf(stderr, "%s: %s", progname, err_msg);
exit(1);
}
for (conn_opt = conn_opts; conn_opt->keyword != NULL; conn_opt++)
{
if (conn_opt->val != NULL && conn_opt->val[0] != '\0')
argcount++;
}
keywords = pg_malloc0((argcount + 1) * sizeof(*keywords));
values = pg_malloc0((argcount + 1) * sizeof(*values));
for (conn_opt = conn_opts; conn_opt->keyword != NULL; conn_opt++)
{
if (conn_opt->val != NULL && conn_opt->val[0] != '\0')
{
keywords[i] = conn_opt->keyword;
values[i] = conn_opt->val;
i++;
}
}
}
else
{
keywords = pg_malloc0((argcount + 1) * sizeof(*keywords));
values = pg_malloc0((argcount + 1) * sizeof(*values));
}
keywords[i] = "dbname";
values[i] = "replication";
i++;
keywords[i] = "replication";
values[i] = "true";
i++;
keywords[i] = "fallback_application_name";
values[i] = progname;
i++;
if (dbhost)
{
keywords[i] = "host";
values[i] = dbhost;
i++;
}
if (dbuser)
{
keywords[i] = "user";
values[i] = dbuser;
i++;
}
if (dbport)
{
keywords[i] = "port";
values[i] = dbport;
i++;
}
while (true)
{
if (password)
free(password);
if (dbpassword)
{
/*
* We've saved a password when a previous connection succeeded,
* meaning this is the call for a second session to the same
* database, so just forcibly reuse that password.
*/
keywords[i] = "password";
values[i] = dbpassword;
dbgetpassword = -1; /* Don't try again if this fails */
}
else if (dbgetpassword == 1)
{
password = simple_prompt(_("Password: "), 100, false);
keywords[i] = "password";
values[i] = password;
}
tmpconn = PQconnectdbParams(keywords, values, true);
/*
* If there is too little memory even to allocate the PGconn object
* and PQconnectdbParams returns NULL, we call exit(1) directly.
*/
if (!tmpconn)
{
fprintf(stderr, _("%s: could not connect to server\n"),
progname);
exit(1);
}
if (PQstatus(tmpconn) == CONNECTION_BAD &&
PQconnectionNeedsPassword(tmpconn) &&
dbgetpassword != -1)
{
dbgetpassword = 1; /* ask for password next time */
PQfinish(tmpconn);
continue;
}
if (PQstatus(tmpconn) != CONNECTION_OK)
{
fprintf(stderr, _("%s: could not connect to server: %s\n"),
progname, PQerrorMessage(tmpconn));
PQfinish(tmpconn);
free(values);
free(keywords);
if (conn_opts)
PQconninfoFree(conn_opts);
return NULL;
}
/* Connection ok! */
free(values);
free(keywords);
if (conn_opts)
PQconninfoFree(conn_opts);
/*
* Ensure we have the same value of integer timestamps as the server
* we are connecting to.
*/
tmpparam = PQparameterStatus(tmpconn, "integer_datetimes");
if (!tmpparam)
{
fprintf(stderr,
_("%s: could not determine server setting for integer_datetimes\n"),
progname);
PQfinish(tmpconn);
exit(1);
}
#ifdef HAVE_INT64_TIMESTAMP
if (strcmp(tmpparam, "on") != 0)
#else
if (strcmp(tmpparam, "off") != 0)
#endif
{
fprintf(stderr,
_("%s: integer_datetimes compile flag does not match server\n"),
progname);
PQfinish(tmpconn);
exit(1);
}
/* Store the password for next run */
if (password)
dbpassword = password;
return tmpconn;
}
}
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