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Slightly delayed patches from Todd...damn holidays :)

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o  A new patch that contains the following changes:
        -- The pg_pwd file is now cached in the postmaster's memory.
        -- pg_pwd is reloaded when the postmaster detects a flag file creat()'ed
           by a backend.
        -- qsort() is used to sort loaded password entries, and bsearch() is
           is used to find entries in the pg_pwd cache.
        -- backends now copy the pg_user relation to pg_pwd.pid, and then
           rename the temp file to be pg_pwd.
        -- The delimiter for pg_pwd has been changed to a tab character.
This commit is contained in:
Marc G. Fournier
1997-12-30 02:26:56 +00:00
parent a544b605e2
commit 3c1332e573
4 changed files with 192 additions and 63 deletions
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38
src/backend/commands/user.c
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@ -11,6 +11,10 @@
*/
#include <stdio.h> /* for sprintf() */
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <postgres.h>
@ -25,7 +29,6 @@
#include <storage/lmgr.h>
#include <tcop/tcopprot.h>
#include <utils/acl.h>
#include <utils/palloc.h>
#include <utils/rel.h>
#include <commands/user.h>
@ -40,10 +43,31 @@ static
void UpdatePgPwdFile(char* sql) {
char* filename;
char* tempname;
/* Create a temporary filename to be renamed later. This prevents the
* backend from clobbering the pg_pwd file while the postmaster might be
* reading from it.
*/
filename = crypt_getpwdfilename();
sprintf(sql, "copy %s to '%s' using delimiters '#'", UserRelationName, filename);
tempname = (char*)malloc(strlen(filename) + 12);
sprintf(tempname, "%s.%d", filename, getpid());
/* Copy the contents of pg_user to the pg_pwd ASCII file using a the SEPCHAR
* character as the delimiter between fields. Then rename the file to its
* final name.
*/
sprintf(sql, "copy %s to '%s' using delimiters %s", UserRelationName, tempname, CRYPT_PWD_FILE_SEPCHAR);
pg_exec_query(sql, (char**)NULL, (Oid*)NULL, 0);
rename(tempname, filename);
free((void*)tempname);
/* Create a flag file the postmaster will detect the next time it tries to
* authenticate a user. The postmaster will know to reload the pg_pwd file
* contents.
*/
filename = crypt_getpwdreloadfilename();
creat(filename, S_IRUSR | S_IWUSR);
}
/*---------------------------------------------------------------------
@ -283,7 +307,7 @@ extern void RemoveUser(char* user) {
HeapTuple tuple;
Datum datum;
Buffer buffer;
char sql[256];
char sql[512];
bool n,
inblock;
int usesysid = -1,
@ -348,8 +372,8 @@ extern void RemoveUser(char* user) {
if ((int)datum == usesysid) {
datum = heap_getattr(tuple, buffer, Anum_pg_database_datname, pg_dsc, &n);
if (memcmp((void*)datum, "template1", 9)) {
dbase = (char**)repalloc((void*)dbase, sizeof(char*) * (ndbase + 1));
dbase[ndbase] = (char*)palloc(NAMEDATALEN + 1);
dbase = (char**)realloc((void*)dbase, sizeof(char*) * (ndbase + 1));
dbase[ndbase] = (char*)malloc(NAMEDATALEN + 1);
memcpy((void*)dbase[ndbase], (void*)datum, NAMEDATALEN);
dbase[ndbase++][NAMEDATALEN] = '\0';
}
@ -362,11 +386,11 @@ extern void RemoveUser(char* user) {
while (ndbase--) {
elog(NOTICE, "Dropping database %s", dbase[ndbase]);
sprintf(sql, "drop database %s", dbase[ndbase]);
pfree((void*)dbase[ndbase]);
free((void*)dbase[ndbase]);
pg_exec_query(sql, (char**)NULL, (Oid*)NULL, 0);
}
if (dbase)
pfree((void*)dbase);
free((void*)dbase);
/* Since pg_user is global over all databases, one of two things must be done
* to insure complete consistency. First, pg_user could be made non-global.