[PATCH v2 1/1] Pass "err" argument by address to "_nsError" function

[PATCH v2 1/1] Pass "err" argument by address to "_nsError" function

[Hazem Mohamed Abuelfotoh]

Commit 0d71523ab584 (“DNS: Support AFS SRV records and
cell db config files”) has refactored the "nsError" function
by moving some of error handling to "_nsError" function
however we are passing the "err" argument to "_nsError"
by value not by address which is wrong as that basically
waste any processing we do in the "_nsError" function
so correcting that by passing "err" by address.

Reported-by: Pratyush Yadav <ptyadav@amazon.com>
Signed-off-by: Hazem Mohamed Abuelfotoh <abuehaze@amazon.com>
---
Changes v1 -> v2:
 - Modify switch conditions to set timeouts correctly based on converted error codes

 dns.afsdb.c        |  4 ++--
 key.dns.h          |  2 +-
 key.dns_resolver.c | 25 ++++++++++++-------------
 3 files changed, 15 insertions(+), 16 deletions(-)

diff --git a/dns.afsdb.c b/dns.afsdb.c
index 986c0f3..7bffb60 100644
--- a/dns.afsdb.c
+++ b/dns.afsdb.c
@@ -228,7 +228,7 @@ static int dns_query_AFSDB(const char *cell)
 
 	if (response_len < 0) {
 		/* negative result */
-		_nsError(h_errno, cell);
+		_nsError(&h_errno, cell);
 		return -1;
 	}
 
@@ -267,7 +267,7 @@ static int dns_query_VL_SRV(const char *cell)
 
 	if (response_len < 0) {
 		/* negative result */
-		_nsError(h_errno, cell);
+		_nsError(&h_errno, cell);
 		return -1;
 	}
 
diff --git a/key.dns.h b/key.dns.h
index 33d0ab3..2fedbc3 100644
--- a/key.dns.h
+++ b/key.dns.h
@@ -59,7 +59,7 @@ extern __attribute__((format(printf, 1, 2)))
 void info(const char *fmt, ...);
 extern __attribute__((noreturn))
 void nsError(int err, const char *domain);
-extern void _nsError(int err, const char *domain);
+extern void _nsError(int *err, const char *domain);
 extern __attribute__((format(printf, 1, 2)))
 void debug(const char *fmt, ...);
 
diff --git a/key.dns_resolver.c b/key.dns_resolver.c
index 7a7ec42..0fe77b5 100644
--- a/key.dns_resolver.c
+++ b/key.dns_resolver.c
@@ -157,19 +157,20 @@ static const int ns_errno_map[] = {
 	[NO_DATA]		= ENODATA,
 };
 
-void _nsError(int err, const char *domain)
+void _nsError(int *err, const char *domain)
 {
 	if (isatty(2))
-		fprintf(stderr, "NS:%s: %s.\n", domain, hstrerror(err));
+		fprintf(stderr, "NS:%s: %s.\n", domain, hstrerror(*err));
 	else
-		syslog(LOG_INFO, "%s: %s", domain, hstrerror(err));
+		syslog(LOG_INFO, "%s: %s", domain, hstrerror(*err));
 
-	if (err >= sizeof(ns_errno_map) / sizeof(ns_errno_map[0]))
-		err = ECONNREFUSED;
-	else
-		err = ns_errno_map[err];
+	if (*err >= sizeof(ns_errno_map) / sizeof(ns_errno_map[0]))
+		*err = ECONNREFUSED;
+	else{
+		*err = ns_errno_map[*err];
+	}
 
-	info("Reject the key with error %d", err);
+	info("Reject the key with error %d", *err);
 }
 
 void nsError(int err, const char *domain)
@@ -177,14 +178,12 @@ void nsError(int err, const char *domain)
 	unsigned timeout;
 	int ret;
 
-	_nsError(err, domain);
-
+	_nsError(&err, domain);
 	switch (err) {
-	case TRY_AGAIN:
+	case EAGAIN:
 		timeout = 1;
 		break;
-	case 0:
-	case NO_RECOVERY:
+	case ECONNREFUSED:
 		timeout = 10;
 		break;
 	default:
-- 
2.47.1

Re: [PATCH v2 1/1] Pass "err" argument by address to "_nsError" function

[Pratyush Yadav]

On Tue, Feb 18 2025, Hazem Mohamed Abuelfotoh wrote:

> Commit 0d71523ab584 (“DNS: Support AFS SRV records and
> cell db config files”) has refactored the "nsError" function
> by moving some of error handling to "_nsError" function
> however we are passing the "err" argument to "_nsError"
> by value not by address which is wrong as that basically
> waste any processing we do in the "_nsError" function
> so correcting that by passing "err" by address.
>
> Reported-by: Pratyush Yadav <ptyadav@amazon.com>
> Signed-off-by: Hazem Mohamed Abuelfotoh <abuehaze@amazon.com>

Acked-by: Pratyush Yadav <ptyadav@amazon.de>

-- 
Regards,
Pratyush Yadav