HEADmaster

3 files changed, 11 insertions, 3 deletions

diff --git a/README b/README
index be6a12a..0c3bf16 100644
--- a/README
+++ b/README
@@ -49,4 +49,10 @@ avtomatska gradnja izvršilnih datotek in programskih paketov za štiri arhitekt
 		http://armel.sijanec.eu/prog/dnsfind
 		i386 pa gradi moj osebni prenosni računalnik, ki ni vedno povezan v Internet.
 
+možne napake:
+	EINVAL na sendto(2):	verjetno je bil paket poslan na lokalno mrežo, vendar je ARP tabela
+				polna. povečajte arp tabelo ali pošljite vse pakete na gateway.
+				https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt
+				sysctl -a | grep -i ipv4.*default.gc.thresh
+
  -- Anton Luka Šijanec <anton@sijanec.eu>  Tue, 19 Jan 2022 14:30:00 +0200
diff --git a/host.c b/host.c
index 9fc2cad..7012876 100644
--- a/host.c
+++ b/host.c
@@ -47,6 +47,8 @@ int resolve (const char * d, uint32_t * r) {
 	};
 	struct addrinfo * result;
 	int ret = getaddrinfo(d, NULL, &hints, &result);
+	if (ret)
+		return ret;
 	*r = ((struct sockaddr_in *) result->ai_addr)->sin_addr.s_addr; /* ah yes, C */
 	freeaddrinfo(result);
 	return ret;
diff --git a/main.c b/main.c
index bdcc30b..a7b2ba4 100644
--- a/main.c
+++ b/main.c
@@ -583,11 +583,11 @@ finished_sending:
 			r = 17;
 			goto r;
 		}
-		if (sendto(s, u, L, 0, (struct sockaddr *) &m, sizeof(struct sockaddr)) == -1) {
-			perror("sendto(s,u, L, 0, (struct sockaddr *) &m, sizeof(struct sockaddr))");
+		if (sendto(s, u, L, 0, (struct sockaddr *) &m, sizeof(struct sockaddr_in)) == -1) {
+			perror("sendto(s, u, L, 0, (struct sockaddr *) &m, sizeof(struct sockad...");
 			r = 18;
 			goto r;
-		}
+		} /* https://stevecao.wordpress.com/2018/09/28/diagnosing-invalid-argument-error */
 		struct timespec z;
 i:
 		if (clock_gettime(CLOCK_MONOTONIC, &z) == -1) {