#include "includes.h"
-
extern fstring remote_machine;
static TDB_CONTEXT *tdb;
-extern int DEBUGLEVEL;
+/****************************************************************************
+ Return the connection tdb context (used for message send all).
+****************************************************************************/
-#ifdef WITH_UTMP
-static void utmp_yield(pid_t pid, const connection_struct *conn);
-static void utmp_claim(const struct connections_data *crec, const connection_struct *conn);
-#endif
+TDB_CONTEXT *conn_tdb_ctx(void)
+{
+ return tdb;
+}
/****************************************************************************
-delete a connection record
+ Delete a connection record.
****************************************************************************/
+
BOOL yield_connection(connection_struct *conn,char *name,int max_connections)
{
struct connections_key key;
DEBUG(3,("Yielding connection to %s\n",name));
ZERO_STRUCT(key);
- key.pid = getpid();
- if (conn) key.cnum = conn->cnum;
+ key.pid = sys_getpid();
+ key.cnum = conn?conn->cnum:-1;
fstrcpy(key.name, name);
kbuf.dptr = (char *)&key;
kbuf.dsize = sizeof(key);
- tdb_delete(tdb, kbuf);
-
-#ifdef WITH_UTMP
- if(conn)
- utmp_yield(key.pid, conn);
-#endif
+ if (tdb_delete(tdb, kbuf) != 0) {
+ int dbg_lvl = (!conn && (tdb_error(tdb) == TDB_ERR_NOEXIST)) ? 3 : 0;
+ DEBUG(dbg_lvl,("yield_connection: tdb_delete for name %s failed with error %s.\n",
+ name, tdb_errorstr(tdb) ));
+ return (False);
+ }
return(True);
}
+struct count_stat {
+ pid_t mypid;
+ int curr_connections;
+ char *name;
+ BOOL Clear;
+};
/****************************************************************************
-claim an entry in the connections database
+ Count the entries belonging to a service in the connection db.
****************************************************************************/
+
+static int count_fn( TDB_CONTEXT *the_tdb, TDB_DATA kbuf, TDB_DATA dbuf, void *udp)
+{
+ struct connections_data crec;
+ struct count_stat *cs = (struct count_stat *)udp;
+
+ if (dbuf.dsize != sizeof(crec))
+ return 0;
+
+ memcpy(&crec, dbuf.dptr, sizeof(crec));
+
+ if (crec.cnum == -1)
+ return 0;
+
+ /* If the pid was not found delete the entry from connections.tdb */
+
+ if (cs->Clear && !process_exists(crec.pid) && (errno == ESRCH)) {
+ DEBUG(2,("pid %u doesn't exist - deleting connections %d [%s]\n",
+ (unsigned int)crec.pid, crec.cnum, crec.name));
+ if (tdb_delete(the_tdb, kbuf) != 0)
+ DEBUG(0,("count_fn: tdb_delete failed with error %s\n", tdb_errorstr(tdb) ));
+ return 0;
+ }
+
+ if (strequal(crec.name, cs->name))
+ cs->curr_connections++;
+
+ return 0;
+}
+
+/****************************************************************************
+ Claim an entry in the connections database.
+****************************************************************************/
+
BOOL claim_connection(connection_struct *conn,char *name,int max_connections,BOOL Clear)
{
struct connections_key key;
struct connections_data crec;
TDB_DATA kbuf, dbuf;
- extern int Client;
-
- if (max_connections <= 0)
- return(True);
if (!tdb) {
- tdb = tdb_open(lock_path("connections.tdb"), 0, TDB_CLEAR_IF_FIRST,
+ tdb = tdb_open_log(lock_path("connections.tdb"), 0, TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
O_RDWR | O_CREAT, 0644);
}
- if (!tdb) return False;
+ if (!tdb)
+ return False;
+
+ /*
+ * Enforce the max connections parameter.
+ */
+
+ if (max_connections > 0) {
+ struct count_stat cs;
+
+ cs.mypid = sys_getpid();
+ cs.curr_connections = 0;
+ cs.name = lp_servicename(SNUM(conn));
+ cs.Clear = Clear;
+
+ /*
+ * This has a race condition, but locking the chain before hand is worse
+ * as it leads to deadlock.
+ */
+
+ if (tdb_traverse(tdb, count_fn, &cs) == -1) {
+ DEBUG(0,("claim_connection: traverse of connections.tdb failed with error %s.\n",
+ tdb_errorstr(tdb) ));
+ return False;
+ }
+
+ if (cs.curr_connections >= max_connections) {
+ DEBUG(1,("claim_connection: Max connections (%d) exceeded for %s\n",
+ max_connections, name ));
+ return False;
+ }
+ }
DEBUG(5,("claiming %s %d\n",name,max_connections));
ZERO_STRUCT(key);
- key.pid = getpid();
+ key.pid = sys_getpid();
key.cnum = conn?conn->cnum:-1;
fstrcpy(key.name, name);
/* fill in the crec */
ZERO_STRUCT(crec);
crec.magic = 0x280267;
- crec.pid = getpid();
+ crec.pid = sys_getpid();
crec.cnum = conn?conn->cnum:-1;
if (conn) {
crec.uid = conn->uid;
crec.start = time(NULL);
StrnCpy(crec.machine,remote_machine,sizeof(crec.machine)-1);
- StrnCpy(crec.addr,conn?conn->client_address:client_addr(Client),sizeof(crec.addr)-1);
+ StrnCpy(crec.addr,conn?conn->client_address:client_addr(),sizeof(crec.addr)-1);
dbuf.dptr = (char *)&crec;
dbuf.dsize = sizeof(crec);
- if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) return False;
-
-#ifdef WITH_UTMP
- if (conn)
- utmp_claim(&crec, conn);
-#endif
-
- return True;
-}
-
-#ifdef WITH_UTMP
-
-/****************************************************************************
-Reflect connection status in utmp/wtmp files.
- T.D.Lee@durham.ac.uk September 1999
-
-Hints for porting:
- o Always attempt to use programmatic interface (pututline() etc.)
- o The "x" (utmpx/wtmpx; HAVE_UTMPX_H) seems preferable.
-
-OS status:
- Solaris 2.x: Tested on 2.6 and 2.7; should be OK on other flavours.
- T.D.Lee@durham.ac.uk
- HPUX 9.x: Not tested. Appears not to have "x".
- IRIX 6.5: Not tested. Appears to have "x".
-
-Notes:
- The 4 byte 'ut_id' component is vital to distinguish connections,
- of which there could be several hundered or even thousand.
- Entries seem to be printable characters, with optional NULL pads.
-
- We need to be distinct from other entries in utmp/wtmp.
-
- Observed things: therefore avoid them. Add to this list please.
- From Solaris 2.x (because that's what I have):
- 'sN' : run-levels; N: [0-9]
- 'co' : console
- 'CC' : arbitrary things; C: [a-z]
- 'rXNN' : rlogin; N: [0-9]; X: [0-9a-z]
- 'tXNN' : rlogin; N: [0-9]; X: [0-9a-z]
- '/NNN' : Solaris CDE
- 'ftpZ' : ftp (Z is the number 255, aka 0377, aka 0xff)
- Mostly a record uses the same 'ut_id' in both "utmp" and "wtmp",
- but differences have been seen.
-
- Arbitrarily I have chosen to use a distinctive 'SM' for the
- first two bytes.
-
- The remaining two encode the connection number used in samba locking
- functions "claim_connection() and "yield_connection()". This seems
- to be a "nicely behaved" number: starting from 0 then working up
- looking for an available slot.
-
-****************************************************************************/
-
-#include <utmp.h>
-
-#ifdef HAVE_UTMPX_H
-#include <utmpx.h>
-#endif
-
-static const char *ut_id_encstr =
- "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
-
-static
-int
-ut_id_encode(int i, char *fourbyte)
-{
- int nbase;
-
- fourbyte[0] = 'S';
- fourbyte[1] = 'M';
-
-/*
- * Encode remaining 2 bytes from 'i'.
- * 'ut_id_encstr' is the character set on which modulo arithmetic is done.
- * Example: digits would produce the base-10 numbers from '001'.
- */
- nbase = strlen(ut_id_encstr);
-
- fourbyte[3] = ut_id_encstr[i % nbase];
- i /= nbase;
- fourbyte[2] = ut_id_encstr[i % nbase];
- i /= nbase;
-
- return(i); /* 0: good; else overflow */
-}
-
-static int utmp_fill(struct utmp *u, const connection_struct *conn, pid_t pid, int i)
-{
- struct timeval timeval;
- int rc;
-
- pstrcpy(u->ut_user, conn->user);
- rc = ut_id_encode(i, u->ut_id);
- slprintf(u->ut_line, 12, "smb/%d", i);
-
- u->ut_pid = pid;
-
- gettimeofday(&timeval, NULL);
- u->ut_time = timeval.tv_sec;
-
- return(rc);
-}
-
-static void utmp_update(const pstring dirname, const struct utmp *u, const char *host)
-{
- pstring fname;
-
-#ifdef HAVE_UTMPX_H
- struct utmpx ux, *uxrc;
-
- getutmpx(u, &ux);
- if (host) {
-#if defined(HAVE_UX_UT_SYSLEN)
- ux.ut_syslen = strlen(host);
-#endif /* defined(HAVE_UX_UT_SYSLEN) */
- pstrcpy(ux.ut_host, host);
- }
-
- pstrcpy(fname, dirname);
- pstrcat(fname, "utmpx");
- utmpxname(fname);
- uxrc = pututxline(&ux);
- if (uxrc == NULL) {
- DEBUG(2,("utmp_update: pututxline() failed\n"));
- return;
- }
-
- pstrcpy(fname, dirname);
- pstrcat(fname, "wtmpx");
- updwtmpx(fname, &ux);
-#else
- pstrcpy(fname, dirname);
- pstrcat(fname, "utmp");
-
- utmpname(fname);
- pututline(u);
-
- pstrcpy(fname, dirname);
- pstrcat(fname, "wtmp");
-
- /* *** OK. Appending wtmp (as distinct from overwriting utmp) has
- me baffled. How is it to be done? *** */
-#endif
-}
-
-static void utmp_yield(int pid, const connection_struct *conn)
-{
- struct utmp u;
- pstring dirname;
-
- if (! lp_utmp(SNUM(conn))) {
- DEBUG(2,("utmp_yield: lp_utmp() NULL\n"));
- return;
- }
-
- pstrcpy(dirname,lp_utmpdir());
- trim_string(dirname,"","/");
- pstrcat(dirname,"/");
-
- DEBUG(2,("utmp_yield: dir:%s conn: user:%s cnum:%d i:%d\n",
- dirname, conn->user, conn->cnum, conn->cnum));
-
- memset((char *)&u, '\0', sizeof(struct utmp));
- u.ut_type = DEAD_PROCESS;
- u.ut_exit.e_termination = 0;
- u.ut_exit.e_exit = 0;
- if (utmp_fill(&u, conn, pid, conn->cnum) == 0) {
- utmp_update(dirname, &u, NULL);
- }
-}
-
-static void utmp_claim(const struct connections_data *crec, const connection_struct *conn)
-{
- extern int Client;
- struct utmp u;
- pstring dirname;
-
- if (conn == NULL) {
- DEBUG(2,("utmp_claim: conn NULL\n"));
- return;
+ if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
+ DEBUG(0,("claim_connection: tdb_store failed with error %s.\n",
+ tdb_errorstr(tdb) ));
+ return False;
}
- if (! lp_utmp(SNUM(conn))) {
- DEBUG(2,("utmp_claim: lp_utmp() NULL\n"));
- return;
- }
-
- pstrcpy(dirname,lp_utmpdir());
- trim_string(dirname,"","/");
- pstrcat(dirname,"/");
-
- DEBUG(2,("utmp_claim: dir:%s conn: user:%s cnum:%d i:%d\n",
- dirname, conn->user, conn->cnum, conn->cnum));
- DEBUG(2,("utmp_claim: crec: pid:%d, cnum:%d name:%s addr:%s mach:%s DNS:%s\n",
- crec->pid, crec->cnum, crec->name, crec->addr, crec->machine, client_name(Client)));
-
-
- memset((char *)&u, '\0', sizeof(struct utmp));
- u.ut_type = USER_PROCESS;
- if (utmp_fill(&u, conn, crec->pid, conn->cnum) == 0) {
- utmp_update(dirname, &u, crec->machine);
- }
+ return True;
}
-
-#endif
git.samba.org / ira / wip.git / blobdiff