printing: Add new parameter "cups timeout".

The default timeout for connections to CUPS servers is set
to 5 minutes in the CUPS libraries. The smbd hangs on startup
until the timeout is reached if the CUPS server is unreachable.
This parameter makes the timeout configurable. The default value
is set to 30 seconds.

Karolin

4 files changed, 43 insertions, 6 deletions

diff --git a/source3/include/printing.h b/source3/include/printing.h
index 2788143cc5..04e30a011b 100644
--- a/source3/include/printing.h
+++ b/source3/include/printing.h
@@ -77,6 +77,7 @@ extern struct printif	iprint_printif;
 #define NEXT_JOBID(j) ((j+1) % PRINT_MAX_JOBID > 0 ? (j+1) % PRINT_MAX_JOBID : 1)
 
 #define MAX_CACHE_VALID_TIME 3600
+#define CUPS_DEFAULT_TIMEOUT 30
 
 #ifndef PRINT_SPOOL_PREFIX
 #define PRINT_SPOOL_PREFIX "smbprn."
diff --git a/source3/include/proto.h b/source3/include/proto.h
index 9ee3fc9071..6eac9d1129 100644
--- a/source3/include/proto.h
+++ b/source3/include/proto.h
@@ -5936,6 +5936,7 @@ const char **lp_svcctl_list(void);
 char *lp_cups_options(int );
 char *lp_cups_server(void);
 char *lp_iprint_server(void);
+int lp_cups_timeout(void);
 const char *lp_ctdbd_socket(void);
 const char **lp_cluster_addresses(void);
 bool lp_clustering(void);
diff --git a/source3/param/loadparm.c b/source3/param/loadparm.c
index 60a1fa4858..db9e990e64 100644
--- a/source3/param/loadparm.c
+++ b/source3/param/loadparm.c
@@ -52,6 +52,7 @@
  */
 
 #include "includes.h"
+#include "printing.h"
 
 bool bLoaded = False;
 
@@ -340,6 +341,7 @@ struct global {
 	int iKeepalive;
 	int iminreceivefile;
 	struct param_opt_struct *param_opt;
+	int cups_timeout;
 };
 
 static struct global Globals;
@@ -2595,6 +2597,15 @@ static struct parm_struct parm_table[] = {
 		.flags		= FLAG_ADVANCED | FLAG_PRINT | FLAG_GLOBAL,
 	},
 	{
+		.label		= "cups timeout",
+		.type		= P_INTEGER,
+		.p_class	= P_GLOBAL,
+		.ptr		= &Globals.cups_timeout,
+		.special	= NULL,
+		.enum_list	= NULL,
+		.flags		= FLAG_ADVANCED,
+	},
+	{
 		.label		= "iprint server",
 		.type		= P_STRING,
 		.p_class	= P_GLOBAL,
@@ -4794,6 +4805,7 @@ static void init_globals(bool first_time_only)
 	 * to never expire, though, when this runs out the afs client will 
 	 * forget the token. Set to 0 to get NEVERDATE.*/
 	Globals.iAfsTokenLifetime = 604800;
+	Globals.cups_timeout = CUPS_DEFAULT_TIMEOUT;
 
 /* these parameters are set to defaults that are more appropriate
    for the increasing samba install base:
@@ -5235,6 +5247,7 @@ FN_GLOBAL_LIST(lp_svcctl_list, &Globals.szServicesList)
 FN_LOCAL_STRING(lp_cups_options, szCupsOptions)
 FN_GLOBAL_STRING(lp_cups_server, &Globals.szCupsServer)
 FN_GLOBAL_STRING(lp_iprint_server, &Globals.szIPrintServer)
+FN_GLOBAL_INTEGER(lp_cups_timeout, &Globals.cups_timeout)
 FN_GLOBAL_CONST_STRING(lp_ctdbd_socket, &Globals.ctdbdSocket)
 FN_GLOBAL_LIST(lp_cluster_addresses, &Globals.szClusterAddresses)
 FN_GLOBAL_BOOL(lp_clustering, &Globals.clustering)
diff --git a/source3/printing/print_cups.c b/source3/printing/print_cups.c
index 593c5c7a1f..2b2cf159fb 100644
--- a/source3/printing/print_cups.c
+++ b/source3/printing/print_cups.c
@@ -24,6 +24,17 @@
 #include <cups/cups.h>
 #include <cups/language.h>
 
+static SIG_ATOMIC_T gotalarm;
+
+/***************************************************************
+ Signal function to tell us we timed out.
+****************************************************************/
+
+static void gotalarm_sig(void)
+{
+        gotalarm = 1;
+}
+
 extern userdom_struct current_user_info;
 
 /*
@@ -45,7 +56,15 @@ static http_t *cups_connect(void)
 	http_t *http;
 	char *server, *p;
 	int port;
-	
+	int timeout = lp_cups_timeout();
+
+	gotalarm = 0;
+
+	if (timeout) {
+                CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig);
+                alarm(timeout);
+        }
+
 	if (lp_cups_server() != NULL && strlen(lp_cups_server()) > 0) {
 		server = smb_xstrdup(lp_cups_server());
 	} else {
@@ -59,15 +78,18 @@ static http_t *cups_connect(void)
 	} else {
 		port = ippPort();
 	}
-	
+
 	DEBUG(10, ("connecting to cups server %s:%d\n",
 		   server, port));
 
-	if ((http = httpConnect(server, port)) == NULL) {
-		DEBUG(0,("Unable to connect to CUPS server %s:%d - %s\n", 
+	http = httpConnect(server, port);
+
+	CatchSignal(SIGALRM, SIGNAL_CAST SIG_IGN);
+        alarm(0);
+
+	if (http == NULL) {
+		DEBUG(0,("Unable to connect to CUPS server %s:%d - %s\n",
 			 server, port, strerror(errno)));
-		SAFE_FREE(server);
-		return NULL;
 	}
 
 	SAFE_FREE(server);