postgresql/contrib/oid2name/oid2name.c
2003-07-27 20:12:06 +00:00

472 lines
10 KiB
C

/*
oid2name; a postgresql 7.1 (+?) app to map OIDs on the filesystem
to table and database names.
b. palmer, bpalmer@crimelabs.net 1-17-2001
*/
#include "postgres_fe.h"
#include <unistd.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include "libpq-fe.h"
/* these are the opts structures for command line params */
struct options
{
int getdatabase;
int gettable;
int getoid;
int quiet;
int systables;
int remotehost;
int remoteport;
int remoteuser;
int remotepass;
int _oid;
char _dbname[128];
char _tbname[128];
char _hostname[128];
char _port[6];
char _username[128];
char _password[128];
};
/* function prototypes */
void get_opts(int, char **, struct options *);
PGconn *sql_conn(const char *, struct options *);
void sql_exec_error(int);
int sql_exec(PGconn *, const char *, int);
void sql_exec_dumpdb(PGconn *);
void sql_exec_dumptable(PGconn *, int);
void sql_exec_searchtable(PGconn *, const char *);
void sql_exec_searchoid(PGconn *, int);
/* function to parse command line options and check for some usage errors. */
void
get_opts(int argc, char **argv, struct options * my_opts)
{
int c;
/* set the defaults */
my_opts->getdatabase = 0;
my_opts->gettable = 0;
my_opts->getoid = 0;
my_opts->quiet = 0;
my_opts->systables = 0;
my_opts->remotehost = 0;
my_opts->remoteport = 0;
my_opts->remoteuser = 0;
my_opts->remotepass = 0;
/* get opts */
while ((c = getopt(argc, argv, "H:p:U:P:d:t:o:qxh?")) != -1)
{
switch (c)
{
/* specify the database */
case 'd':
my_opts->getdatabase = 1;
sscanf(optarg, "%s", my_opts->_dbname);
break;
/* specify the table name */
case 't':
/* make sure we set the database first */
if (!my_opts->getdatabase)
{
fprintf(stderr, "You must specify a database to dump from.\n");
exit(1);
}
/* make sure we don't try to do a -o also */
if (my_opts->getoid)
{
fprintf(stderr, "You can only specify either oid or table\n");
exit(1);
}
my_opts->gettable = 1;
sscanf(optarg, "%s", my_opts->_tbname);
break;
/* specify the oid int */
case 'o':
/* make sure we set the database first */
if (!my_opts->getdatabase)
{
fprintf(stderr, "You must specify a database to dump from.\n");
exit(1);
}
/* make sure we don't try to do a -t also */
if (my_opts->gettable)
{
fprintf(stderr, "You can only specify either oid or table\n");
exit(1);
}
my_opts->getoid = 1;
sscanf(optarg, "%i", &my_opts->_oid);
break;
case 'q':
my_opts->quiet = 1;
break;
/* host to connect to */
case 'H':
my_opts->remotehost = 1;
sscanf(optarg, "%s", my_opts->_hostname);
break;
/* port to connect to on remote host */
case 'p':
my_opts->remoteport = 1;
sscanf(optarg, "%s", my_opts->_port);
break;
/* username */
case 'U':
my_opts->remoteuser = 1;
sscanf(optarg, "%s", my_opts->_username);
break;
/* password */
case 'P':
my_opts->remotepass = 1;
sscanf(optarg, "%s", my_opts->_password);
break;
/* display system tables */
case 'x':
my_opts->systables = 1;
break;
/* help! (ugly in code for easier editing) */
case '?':
case 'h':
fprintf(stderr, "\
Usage: pg_oid2name [-d database [-x] ] [-t table | -o oid]\n\
default action display all databases\n\
-d database database to oid2name\n\
-x display system tables\n\
-t table | -o oid search for table name (-t) or\n\
oid (-o) in -d database\n\
-q quiet\n\
-H host connect to remote host\n\
-p port host port to connect to\n\
-U username username to connect with\n\
-P password password for username\n\
");
exit(1);
break;
}
}
}
/* establish connection with database. */
PGconn *
sql_conn(const char *dbName, struct options * my_opts)
{
char *pghost,
*pgport;
char *pgoptions,
*pgtty;
char *pguser,
*pgpass;
PGconn *conn;
pghost = NULL;
pgport = NULL;
pgoptions = NULL; /* special options to start up the backend
* server */
pgtty = NULL; /* debugging tty for the backend server */
pguser = NULL;
pgpass = NULL;
/* override the NULLs with the user params if passed */
if (my_opts->remotehost)
{
pghost = (char *) malloc(128);
sscanf(my_opts->_hostname, "%s", pghost);
}
if (my_opts->remoteport)
{
pgport = (char *) malloc(6);
sscanf(my_opts->_port, "%s", pgport);
}
if (my_opts->remoteuser)
{
pguser = (char *) malloc(128);
sscanf(my_opts->_username, "%s", pguser);
}
if (my_opts->remotepass)
{
pgpass = (char *) malloc(128);
sscanf(my_opts->_password, "%s", pgpass);
}
/* login */
conn = PQsetdbLogin(pghost, pgport, pgoptions, pgtty, dbName, pguser, pgpass);
/* deal with errors */
if (PQstatus(conn) == CONNECTION_BAD)
{
fprintf(stderr, "Connection to database '%s' failed.\n", dbName);
fprintf(stderr, "%s", PQerrorMessage(conn));
PQfinish(conn);
exit(1);
}
/* free data structures: not strictly necessary */
if (pghost != NULL)
free(pghost);
if (pgport != NULL)
free(pgport);
if (pguser != NULL)
free(pguser);
if (pgpass != NULL)
free(pgpass);
sql_exec(conn, "SET search_path = public;", 0);
/* return the conn if good */
return conn;
}
/* If the sql_ command has an error, this function looks up the error number and prints it out. */
void
sql_exec_error(int error_number)
{
fprintf(stderr, "Error number %i.\n", error_number);
switch (error_number)
{
case 3:
fprintf(stderr, "Error: PGRES_COPY_OUT\n");
break;
case 4:
fprintf(stderr, "Error: PGRES_COPY_IN\n");
break;
case 5:
fprintf(stderr, "Error: PGRES_BAD_RESPONCE\n");
break;
case 6:
fprintf(stderr, "Error: PGRES_NONFATAL_ERROR\n");
break;
case 7:
fprintf(stderr, "Error: PGRES_FATAL_ERROR\n");
break;
}
}
/* actual code to make call to the database and print the output data */
int
sql_exec(PGconn *conn, const char *todo, int match)
{
PGresult *res;
int numbfields;
int error_number;
int i,
len;
/* make the call */
res = PQexec(conn, todo);
/* check and deal with errors */
if (!res || PQresultStatus(res) > 2)
{
error_number = PQresultStatus(res);
fprintf(stderr, "There was an error in the SQL command:\n%s\n", todo);
sql_exec_error(error_number);
fprintf(stderr, "PQerrorMessage = %s\n", PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
exit(-1);
}
/* get the number of fields */
numbfields = PQntuples(res);
/* if we only expect 1 and there mode than, return -2 */
if (match == 1 && numbfields > 1)
return -2;
/* return -1 if there aren't any returns */
if (match == 1 && numbfields < 1)
return -1;
/* for each row, dump the information */
for (i = 0; i < numbfields; i++)
{
len = strlen(PQgetvalue(res, i, 0));
fprintf(stdout, "%-6s = %s\n", PQgetvalue(res, i, 0), PQgetvalue(res, i, 1));
}
/* clean the PGconn once done */
PQclear(res);
return 0;
}
/* dump all databases known by the system table */
void
sql_exec_dumpdb(PGconn *conn)
{
char todo[1024];
/* get the oid and database name from the system pg_database table */
snprintf(todo, 1024, "select oid,datname from pg_database");
sql_exec(conn, todo, 0);
}
/* display all tables in whatever db we are connected to. don't display the
system tables by default */
void
sql_exec_dumptable(PGconn *conn, int systables)
{
char todo[1024];
/* don't exclude the systables if this is set */
if (systables == 1)
snprintf(todo, 1024, "select relfilenode,relname from pg_class order by relname");
else
snprintf(todo, 1024, "select relfilenode,relname from pg_class "
"where relkind not in ('v','s', 'c') and "
"relname not like 'pg_%%' order by relname");
sql_exec(conn, todo, 0);
}
/* display the oid for a given tablename for whatever db we are connected
to. do we want to allow %bar% in the search? Not now. */
void
sql_exec_searchtable(PGconn *conn, const char *tablename)
{
int returnvalue;
char todo[1024];
/* get the oid and tablename where the name matches tablename */
snprintf(todo, 1024, "select relfilenode,relname from pg_class where relname = '%s'", tablename);
returnvalue = sql_exec(conn, todo, 1);
/* deal with the return errors */
if (returnvalue == -1)
printf("No tables with that name found\n");
if (returnvalue == -2)
printf("VERY scary: more than one table with that name found!!\n");
}
/* same as above */
void
sql_exec_searchoid(PGconn *conn, int oid)
{
int returnvalue;
char todo[1024];
snprintf(todo, 1024, "select relfilenode,relname from pg_class where oid = %i", oid);
returnvalue = sql_exec(conn, todo, 1);
if (returnvalue == -1)
printf("No tables with that oid found\n");
if (returnvalue == -2)
printf("VERY scary: more than one table with that oid found!!\n");
}
int
main(int argc, char **argv)
{
struct options *my_opts;
PGconn *pgconn;
my_opts = (struct options *) malloc(sizeof(struct options));
/* parse the opts */
get_opts(argc, argv, my_opts);
/* display all the tables in the database */
if (my_opts->getdatabase & my_opts->gettable)
{
if (!my_opts->quiet)
{
printf("Oid of table %s from database \"%s\":\n", my_opts->_tbname, my_opts->_dbname);
printf("---------------------------------\n");
}
pgconn = sql_conn(my_opts->_dbname, my_opts);
sql_exec_searchtable(pgconn, my_opts->_tbname);
PQfinish(pgconn);
exit(1);
}
/* search for the tablename of the given OID */
if (my_opts->getdatabase & my_opts->getoid)
{
if (!my_opts->quiet)
{
printf("Tablename of oid %i from database \"%s\":\n", my_opts->_oid, my_opts->_dbname);
printf("---------------------------------\n");
}
pgconn = sql_conn(my_opts->_dbname, my_opts);
sql_exec_searchoid(pgconn, my_opts->_oid);
PQfinish(pgconn);
exit(1);
}
/* search for the oid for the given tablename */
if (my_opts->getdatabase)
{
if (!my_opts->quiet)
{
printf("All tables from database \"%s\":\n", my_opts->_dbname);
printf("---------------------------------\n");
}
pgconn = sql_conn(my_opts->_dbname, my_opts);
sql_exec_dumptable(pgconn, my_opts->systables);
PQfinish(pgconn);
exit(1);
}
/* display all the databases for the server we are connected to.. */
if (!my_opts->quiet)
{
printf("All databases:\n");
printf("---------------------------------\n");
}
pgconn = sql_conn("template1", my_opts);
sql_exec_dumpdb(pgconn);
PQfinish(pgconn);
exit(0);
}