postgresql/contrib/oid2name/oid2name.c
Tom Lane 58cd8dca3d Avoid redundantly prefixing PQerrorMessage for a connection failure.
libpq's error messages for connection failures pretty well stand on
their own, especially since commits 52a10224e/27a48e5a1.  Prefixing
them with 'could not connect to database "foo"' or the like is just
redundant, and perhaps even misleading if the specific database name
isn't relevant to the failure.  (When it is, we trust that the
backend's error message will include the DB name.)  Indeed, psql
hasn't used any such prefix in a long time.  So, make all our other
programs and documentation examples agree with psql's practice.

Discussion: https://postgr.es/m/1094524.1611266589@sss.pgh.pa.us
2021-01-22 16:52:31 -05:00

652 lines
16 KiB
C

/*
* oid2name, a PostgreSQL app to map OIDs on the filesystem
* to table and database names.
*
* Originally by
* B. Palmer, bpalmer@crimelabs.net 1-17-2001
*
* contrib/oid2name/oid2name.c
*/
#include "postgres_fe.h"
#include "catalog/pg_class_d.h"
#include "common/connect.h"
#include "common/logging.h"
#include "common/string.h"
#include "getopt_long.h"
#include "libpq-fe.h"
#include "pg_getopt.h"
/* an extensible array to keep track of elements to show */
typedef struct
{
char **array;
int num;
int alloc;
} eary;
/* these are the opts structures for command line params */
struct options
{
eary *tables;
eary *oids;
eary *filenodes;
bool quiet;
bool systables;
bool indexes;
bool nodb;
bool extended;
bool tablespaces;
char *dbname;
char *hostname;
char *port;
char *username;
const char *progname;
};
/* function prototypes */
static void help(const char *progname);
void get_opts(int, char **, struct options *);
void add_one_elt(char *eltname, eary *eary);
char *get_comma_elts(eary *eary);
PGconn *sql_conn(struct options *);
int sql_exec(PGconn *, const char *sql, bool quiet);
void sql_exec_dumpalldbs(PGconn *, struct options *);
void sql_exec_dumpalltables(PGconn *, struct options *);
void sql_exec_searchtables(PGconn *, struct options *);
void sql_exec_dumpalltbspc(PGconn *, struct options *);
/* function to parse command line options and check for some usage errors. */
void
get_opts(int argc, char **argv, struct options *my_opts)
{
static struct option long_options[] = {
{"dbname", required_argument, NULL, 'd'},
{"host", required_argument, NULL, 'h'},
{"host", required_argument, NULL, 'H'}, /* deprecated */
{"filenode", required_argument, NULL, 'f'},
{"indexes", no_argument, NULL, 'i'},
{"oid", required_argument, NULL, 'o'},
{"port", required_argument, NULL, 'p'},
{"quiet", no_argument, NULL, 'q'},
{"tablespaces", no_argument, NULL, 's'},
{"system-objects", no_argument, NULL, 'S'},
{"table", required_argument, NULL, 't'},
{"username", required_argument, NULL, 'U'},
{"version", no_argument, NULL, 'V'},
{"extended", no_argument, NULL, 'x'},
{"help", no_argument, NULL, '?'},
{NULL, 0, NULL, 0}
};
int c;
const char *progname;
int optindex;
pg_logging_init(argv[0]);
progname = get_progname(argv[0]);
/* set the defaults */
my_opts->quiet = false;
my_opts->systables = false;
my_opts->indexes = false;
my_opts->nodb = false;
my_opts->extended = false;
my_opts->tablespaces = false;
my_opts->dbname = NULL;
my_opts->hostname = NULL;
my_opts->port = NULL;
my_opts->username = NULL;
my_opts->progname = progname;
if (argc > 1)
{
if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
{
help(progname);
exit(0);
}
if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
{
puts("oid2name (PostgreSQL) " PG_VERSION);
exit(0);
}
}
/* get opts */
while ((c = getopt_long(argc, argv, "d:f:h:H:io:p:qsSt:U:x", long_options, &optindex)) != -1)
{
switch (c)
{
/* specify the database */
case 'd':
my_opts->dbname = pg_strdup(optarg);
break;
/* specify one filenode to show */
case 'f':
add_one_elt(optarg, my_opts->filenodes);
break;
/* host to connect to */
case 'H': /* deprecated */
case 'h':
my_opts->hostname = pg_strdup(optarg);
break;
/* also display indexes */
case 'i':
my_opts->indexes = true;
break;
/* specify one Oid to show */
case 'o':
add_one_elt(optarg, my_opts->oids);
break;
/* port to connect to on remote host */
case 'p':
my_opts->port = pg_strdup(optarg);
break;
/* don't show headers */
case 'q':
my_opts->quiet = true;
break;
/* dump tablespaces only */
case 's':
my_opts->tablespaces = true;
break;
/* display system tables */
case 'S':
my_opts->systables = true;
break;
/* specify one tablename to show */
case 't':
add_one_elt(optarg, my_opts->tables);
break;
/* username */
case 'U':
my_opts->username = pg_strdup(optarg);
break;
/* display extra columns */
case 'x':
my_opts->extended = true;
break;
default:
fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
exit(1);
}
}
if (optind < argc)
{
fprintf(stderr, _("%s: too many command-line arguments (first is \"%s\")\n"),
progname, argv[optind]);
fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
exit(1);
}
}
static void
help(const char *progname)
{
printf("%s helps examining the file structure used by PostgreSQL.\n\n"
"Usage:\n"
" %s [OPTION]...\n"
"\nOptions:\n"
" -f, --filenode=FILENODE show info for table with given file node\n"
" -i, --indexes show indexes and sequences too\n"
" -o, --oid=OID show info for table with given OID\n"
" -q, --quiet quiet (don't show headers)\n"
" -s, --tablespaces show all tablespaces\n"
" -S, --system-objects show system objects too\n"
" -t, --table=TABLE show info for named table\n"
" -V, --version output version information, then exit\n"
" -x, --extended extended (show additional columns)\n"
" -?, --help show this help, then exit\n"
"\nConnection options:\n"
" -d, --dbname=DBNAME database to connect to\n"
" -h, --host=HOSTNAME database server host or socket directory\n"
" -H same as -h, deprecated option\n"
" -p, --port=PORT database server port number\n"
" -U, --username=USERNAME connect as specified database user\n"
"\nThe default action is to show all database OIDs.\n\n"
"Report bugs to <%s>.\n"
"%s home page: <%s>\n",
progname, progname, PACKAGE_BUGREPORT, PACKAGE_NAME, PACKAGE_URL);
}
/*
* add_one_elt
*
* Add one element to a (possibly empty) eary struct.
*/
void
add_one_elt(char *eltname, eary *eary)
{
if (eary->alloc == 0)
{
eary ->alloc = 8;
eary ->array = (char **) pg_malloc(8 * sizeof(char *));
}
else if (eary->num >= eary->alloc)
{
eary ->alloc *= 2;
eary ->array = (char **) pg_realloc(eary->array,
eary->alloc * sizeof(char *));
}
eary ->array[eary->num] = pg_strdup(eltname);
eary ->num++;
}
/*
* get_comma_elts
*
* Return the elements of an eary as a (freshly allocated) single string, in
* single quotes, separated by commas and properly escaped for insertion in an
* SQL statement.
*/
char *
get_comma_elts(eary *eary)
{
char *ret,
*ptr;
int i,
length = 0;
if (eary->num == 0)
return pg_strdup("");
/*
* PQescapeString wants 2 * length + 1 bytes of breath space. Add two
* chars per element for the single quotes and one for the comma.
*/
for (i = 0; i < eary->num; i++)
length += strlen(eary->array[i]);
ret = (char *) pg_malloc(length * 2 + 4 * eary->num);
ptr = ret;
for (i = 0; i < eary->num; i++)
{
if (i != 0)
sprintf(ptr++, ",");
sprintf(ptr++, "'");
ptr += PQescapeString(ptr, eary->array[i], strlen(eary->array[i]));
sprintf(ptr++, "'");
}
return ret;
}
/* establish connection with database. */
PGconn *
sql_conn(struct options *my_opts)
{
PGconn *conn;
char *password = NULL;
bool new_pass;
PGresult *res;
/*
* Start the connection. Loop until we have a password if requested by
* backend.
*/
do
{
#define PARAMS_ARRAY_SIZE 7
const char *keywords[PARAMS_ARRAY_SIZE];
const char *values[PARAMS_ARRAY_SIZE];
keywords[0] = "host";
values[0] = my_opts->hostname;
keywords[1] = "port";
values[1] = my_opts->port;
keywords[2] = "user";
values[2] = my_opts->username;
keywords[3] = "password";
values[3] = password;
keywords[4] = "dbname";
values[4] = my_opts->dbname;
keywords[5] = "fallback_application_name";
values[5] = my_opts->progname;
keywords[6] = NULL;
values[6] = NULL;
new_pass = false;
conn = PQconnectdbParams(keywords, values, true);
if (!conn)
{
pg_log_error("could not connect to database %s",
my_opts->dbname);
exit(1);
}
if (PQstatus(conn) == CONNECTION_BAD &&
PQconnectionNeedsPassword(conn) &&
!password)
{
PQfinish(conn);
password = simple_prompt("Password: ", false);
new_pass = true;
}
} while (new_pass);
/* check to see that the backend connection was successfully made */
if (PQstatus(conn) == CONNECTION_BAD)
{
pg_log_error("%s", PQerrorMessage(conn));
PQfinish(conn);
exit(1);
}
res = PQexec(conn, ALWAYS_SECURE_SEARCH_PATH_SQL);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
pg_log_error("could not clear search_path: %s",
PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
exit(-1);
}
PQclear(res);
/* return the conn if good */
return conn;
}
/*
* Actual code to make call to the database and print the output data.
*/
int
sql_exec(PGconn *conn, const char *todo, bool quiet)
{
PGresult *res;
int nfields;
int nrows;
int i,
j,
l;
int *length;
char *pad;
/* make the call */
res = PQexec(conn, todo);
/* check and deal with errors */
if (!res || PQresultStatus(res) > 2)
{
pg_log_error("query failed: %s", PQerrorMessage(conn));
pg_log_error("query was: %s", todo);
PQclear(res);
PQfinish(conn);
exit(-1);
}
/* get the number of fields */
nrows = PQntuples(res);
nfields = PQnfields(res);
/* for each field, get the needed width */
length = (int *) pg_malloc(sizeof(int) * nfields);
for (j = 0; j < nfields; j++)
length[j] = strlen(PQfname(res, j));
for (i = 0; i < nrows; i++)
{
for (j = 0; j < nfields; j++)
{
l = strlen(PQgetvalue(res, i, j));
if (l > length[j])
length[j] = strlen(PQgetvalue(res, i, j));
}
}
/* print a header */
if (!quiet)
{
for (j = 0, l = 0; j < nfields; j++)
{
fprintf(stdout, "%*s", length[j] + 2, PQfname(res, j));
l += length[j] + 2;
}
fprintf(stdout, "\n");
pad = (char *) pg_malloc(l + 1);
MemSet(pad, '-', l);
pad[l] = '\0';
fprintf(stdout, "%s\n", pad);
free(pad);
}
/* for each row, dump the information */
for (i = 0; i < nrows; i++)
{
for (j = 0; j < nfields; j++)
fprintf(stdout, "%*s", length[j] + 2, PQgetvalue(res, i, j));
fprintf(stdout, "\n");
}
/* cleanup */
PQclear(res);
free(length);
return 0;
}
/*
* Dump all databases. There are no system objects to worry about.
*/
void
sql_exec_dumpalldbs(PGconn *conn, struct options *opts)
{
char todo[1024];
/* get the oid and database name from the system pg_database table */
snprintf(todo, sizeof(todo),
"SELECT d.oid AS \"Oid\", datname AS \"Database Name\", "
"spcname AS \"Tablespace\" FROM pg_catalog.pg_database d JOIN pg_catalog.pg_tablespace t ON "
"(dattablespace = t.oid) ORDER BY 2");
sql_exec(conn, todo, opts->quiet);
}
/*
* Dump all tables, indexes and sequences in the current database.
*/
void
sql_exec_dumpalltables(PGconn *conn, struct options *opts)
{
char todo[1024];
char *addfields = ",c.oid AS \"Oid\", nspname AS \"Schema\", spcname as \"Tablespace\" ";
snprintf(todo, sizeof(todo),
"SELECT pg_catalog.pg_relation_filenode(c.oid) as \"Filenode\", relname as \"Table Name\" %s "
"FROM pg_catalog.pg_class c "
" LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace "
" LEFT JOIN pg_catalog.pg_database d ON d.datname = pg_catalog.current_database(),"
" pg_catalog.pg_tablespace t "
"WHERE relkind IN (" CppAsString2(RELKIND_RELATION) ","
CppAsString2(RELKIND_MATVIEW) "%s%s) AND "
" %s"
" t.oid = CASE"
" WHEN reltablespace <> 0 THEN reltablespace"
" ELSE dattablespace"
" END "
"ORDER BY relname",
opts->extended ? addfields : "",
opts->indexes ? "," CppAsString2(RELKIND_INDEX) "," CppAsString2(RELKIND_SEQUENCE) : "",
opts->systables ? "," CppAsString2(RELKIND_TOASTVALUE) : "",
opts->systables ? "" : "n.nspname NOT IN ('pg_catalog', 'information_schema') AND n.nspname !~ '^pg_toast' AND");
sql_exec(conn, todo, opts->quiet);
}
/*
* Show oid, filenode, name, schema and tablespace for each of the
* given objects in the current database.
*/
void
sql_exec_searchtables(PGconn *conn, struct options *opts)
{
char *todo;
char *qualifiers,
*ptr;
char *comma_oids,
*comma_filenodes,
*comma_tables;
bool written = false;
char *addfields = ",c.oid AS \"Oid\", nspname AS \"Schema\", spcname as \"Tablespace\" ";
/* get tables qualifiers, whether names, filenodes, or OIDs */
comma_oids = get_comma_elts(opts->oids);
comma_tables = get_comma_elts(opts->tables);
comma_filenodes = get_comma_elts(opts->filenodes);
/* 80 extra chars for SQL expression */
qualifiers = (char *) pg_malloc(strlen(comma_oids) + strlen(comma_tables) +
strlen(comma_filenodes) + 80);
ptr = qualifiers;
if (opts->oids->num > 0)
{
ptr += sprintf(ptr, "c.oid IN (%s)", comma_oids);
written = true;
}
if (opts->filenodes->num > 0)
{
if (written)
ptr += sprintf(ptr, " OR ");
ptr += sprintf(ptr, "pg_catalog.pg_relation_filenode(c.oid) IN (%s)", comma_filenodes);
written = true;
}
if (opts->tables->num > 0)
{
if (written)
ptr += sprintf(ptr, " OR ");
sprintf(ptr, "c.relname ~~ ANY (ARRAY[%s])", comma_tables);
}
free(comma_oids);
free(comma_tables);
free(comma_filenodes);
/* now build the query */
todo = psprintf("SELECT pg_catalog.pg_relation_filenode(c.oid) as \"Filenode\", relname as \"Table Name\" %s\n"
"FROM pg_catalog.pg_class c\n"
" LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace\n"
" LEFT JOIN pg_catalog.pg_database d ON d.datname = pg_catalog.current_database(),\n"
" pg_catalog.pg_tablespace t\n"
"WHERE relkind IN (" CppAsString2(RELKIND_RELATION) ","
CppAsString2(RELKIND_MATVIEW) ","
CppAsString2(RELKIND_INDEX) ","
CppAsString2(RELKIND_SEQUENCE) ","
CppAsString2(RELKIND_TOASTVALUE) ") AND\n"
" t.oid = CASE\n"
" WHEN reltablespace <> 0 THEN reltablespace\n"
" ELSE dattablespace\n"
" END AND\n"
" (%s)\n"
"ORDER BY relname\n",
opts->extended ? addfields : "",
qualifiers);
free(qualifiers);
sql_exec(conn, todo, opts->quiet);
}
void
sql_exec_dumpalltbspc(PGconn *conn, struct options *opts)
{
char todo[1024];
snprintf(todo, sizeof(todo),
"SELECT oid AS \"Oid\", spcname as \"Tablespace Name\"\n"
"FROM pg_catalog.pg_tablespace");
sql_exec(conn, todo, opts->quiet);
}
int
main(int argc, char **argv)
{
struct options *my_opts;
PGconn *pgconn;
my_opts = (struct options *) pg_malloc(sizeof(struct options));
my_opts->oids = (eary *) pg_malloc(sizeof(eary));
my_opts->tables = (eary *) pg_malloc(sizeof(eary));
my_opts->filenodes = (eary *) pg_malloc(sizeof(eary));
my_opts->oids->num = my_opts->oids->alloc = 0;
my_opts->tables->num = my_opts->tables->alloc = 0;
my_opts->filenodes->num = my_opts->filenodes->alloc = 0;
/* parse the opts */
get_opts(argc, argv, my_opts);
if (my_opts->dbname == NULL)
{
my_opts->dbname = "postgres";
my_opts->nodb = true;
}
pgconn = sql_conn(my_opts);
/* display only tablespaces */
if (my_opts->tablespaces)
{
if (!my_opts->quiet)
printf("All tablespaces:\n");
sql_exec_dumpalltbspc(pgconn, my_opts);
PQfinish(pgconn);
exit(0);
}
/* display the given elements in the database */
if (my_opts->oids->num > 0 ||
my_opts->tables->num > 0 ||
my_opts->filenodes->num > 0)
{
if (!my_opts->quiet)
printf("From database \"%s\":\n", my_opts->dbname);
sql_exec_searchtables(pgconn, my_opts);
PQfinish(pgconn);
exit(0);
}
/* no elements given; dump the given database */
if (my_opts->dbname && !my_opts->nodb)
{
if (!my_opts->quiet)
printf("From database \"%s\":\n", my_opts->dbname);
sql_exec_dumpalltables(pgconn, my_opts);
PQfinish(pgconn);
exit(0);
}
/* no database either; dump all databases */
if (!my_opts->quiet)
printf("All databases:\n");
sql_exec_dumpalldbs(pgconn, my_opts);
PQfinish(pgconn);
return 0;
}