Merge pull request #175 from olerem/testj1938

sync testj1939 with latest kernel UAPI

can-j1939-kickstart.md

@@ -33,7 +33,7 @@ testj1939 can be told to print the used API calls by adding **-v** program argum
 
 Do in terminal 1
 
-	./testj1939 -r can0:
+	testj1939 -B -r can0
 
 Send raw CAN in terminal 2
 
@@ -54,20 +54,11 @@ In J1939, this means that ECU 0x40 sends directly to ECU 0x41
 Since we did not bind to address 0x41, this traffic
 is not meant for us and *testj1939* does not receive it.
 
-### Use source address
-
-Binding a can-j1939 socket to a source address will register
-allow you to send packets.
-
-	./testj1939 can0:0x80
-
-Your system had, for a small moment, source address 0x80 assigned.
-
 ### receive with source address
 
 Terminal 1:
 
-	./testj1939 -r can0:0x80
+	testj1939 -r can0:0x80
 
 Terminal 2:
 
@@ -87,37 +78,42 @@ Open in terminal 1:
 
 And to these test in another terminal
 
-	./testj1939 -s can0:0x80,0x3ffff
+	testj1939 -B -s can0:0x80 can0:,0x3ffff
 
 This produces **1BFFFF80#0123456789ABCDEF** on CAN.
 
+Note: To be able to send a broadcast we need to use, we need to use "-B" flag.
+
 ### Multiple source addresses on 1 CAN device
 
-	./testj1939 -s can0:0x90,0x3ffff
+	testj1939 -B -s can0:0x90 can0:,0x3ffff
 
 produces **1BFFFF90#0123456789ABCDEF** ,
 
 ### Use PDU1 PGN
 
-	./testj1939 -s can0:0x80,0x12345
+	testj1939 -B -s can0:0x80 can0:,0x12300
 
 emits **1923FF80#0123456789ABCDEF** .
 
-Note that the real PGN is **0x12300**, and destination address is **0xff**.
+Note that the PGN is **0x12300**, and destination address is **0xff**.
 
 ### Use destination address info
 
+Since in this example we use unicast source and destination addresses, we do
+not need to use "-B" (broadcast) flag.
+
 The destination field may be set during sendto().
 *testj1939* implements that like this
 
-	./testj1939 -s can0:0x80,0x12345 can0:0x40
+	testj1939 -s can0:0x80 can0:0x40,0x12300
 
 emits **19234080#0123456789ABCDEF** .
 
 The destination CAN iface __must__ always match the source CAN iface.
 Specifying one during bind is therefore sufficient.
 
-	./testj1939 -s can0:,0x12300 :0x40
+	testj1939 -s can0:0x80 :0x40,0x12300
 
 emits the very same.
 
@@ -129,13 +125,13 @@ __sendto( *peername* )__ , and only one is used.
 
 For broadcasted transmissions
 
-	./testj1939 -s can0:0x80,0x12300 :,0x32100
+	testj1939 -B -s can0:0x80 :,0x32100
 
-emits **1B21FF80#0123456789ABCDEF** rather than 1923FF80#012345678ABCDEF
+emits **1B21FF80#0123456789ABCDEF**
 
 Destination specific transmissions
 
-	./testj1939 -s can0:0x80,0x12300 :0x40,0x32100
+	testj1939 -s can0:0x80,0x12300 :0x40,0x32100
 
 emits **1B214080#0123456789ABCDEF** .
 
@@ -146,21 +142,7 @@ It makes sometimes sense to omit the PGN in __bind( *sockname* )__ .
 J1939 transparently switches to *Transport Protocol* when packets
 do not fit into single CAN packets.
 
-	./testj1939 -s20 can0:0x80 :,0x12300
-
-emits:
-
-	18ECFF80#20140003FF002301
-
-This is the first fragment for broadcasted *Transport Protocol*.
-_testj1939_ returns before the subsequent packets can leave, and
-as the last socket on the system closes, can-j1939 effectively
-cleans up all resources. Real-world applications will run like forever,
-and will not encounter this side-effect.
-
-Try again, and instruct _testj1939_ to keep the socket open for 1 second.
-
-	./testj1939 -w1.0 -s20 can0:0x80 :,0x12300
+	testj1939 -B -s20 can0:0x80 :,0x12300
 
 emits:
 
@@ -178,11 +160,11 @@ First assign 0x90 to the local system.
 This becomes important because the kernel must interact in the
 transport protocol sessions before the complete packet is delivered.
 
-	./testj1939 can0:0x90 -r &
+	testj1939 can0:0x90 -r &
 
 Now test:
 
-	./testj1939 -s20 can0:0x80 :0x90,0x12300
+	testj1939 -s20 can0:0x80 :0x90,0x12300
 
 emits:
 
@@ -200,8 +182,8 @@ This overhead scales very good for larger J1939 packets.
 
 ### Change priority of J1939 packets
 
-	./testj1939 -s can0:0x80,0x0100
-	./testj1939 -s -p3 can0:0x80,0x0200
+	testj1939 -B -s can0:0x80 :,0x0100
+	testj1939 -B -s -p3 can0:0x80 :,0x0200
 
 emits
 

testj1939.c

@@ -39,7 +39,9 @@ static const char help_msg[] =
 	"		This atually receives packets\n"
 	" -c		Issue connect()\n"
 	" -p=PRIO	Set priority to PRIO\n"
+	" -P		Promiscuous mode. Allow to receive all packets\n"
 	" -b		Do normal bind with SA+1 and rebind with actual SA\n"
+	" -B		Allow to send and receive broadcast packets.\n"
 	" -o		Omit bind\n"
 	" -n		Emit 64bit NAMEs in output\n"
 	" -w[TIME]	Return after TIME (default 1) seconds\n"
@@ -49,7 +51,7 @@ static const char help_msg[] =
 	"\n"
 	;
 
-static const char optstring[] = "?vbos::rep:cnw::";
+static const char optstring[] = "?vbBPos::rep:cnw::";
 
 static void onsigalrm(int sig)
 {
@@ -92,6 +94,7 @@ int main(int argc, char *argv[])
 	int valid_peername = 0;
 	int todo_send = 0, todo_recv = 0, todo_echo = 0, todo_prio = -1;
 	int todo_connect = 0, todo_names = 0, todo_wait = 0, todo_rebind = 0;
+	int todo_broadcast = 0, todo_promisc = 0;
 	int no_bind = 0;
 
 	/* argument parsing */
@@ -114,6 +117,9 @@ int main(int argc, char *argv[])
 	case 'p':
 		todo_prio = strtoul(optarg, NULL, 0);
 		break;
+	case 'P':
+		todo_promisc = 1;
+		break;
 	case 'c':
 		todo_connect = 1;
 		break;
@@ -123,6 +129,9 @@ int main(int argc, char *argv[])
 	case 'b':
 		todo_rebind = 1;
 		break;
+	case 'B':
+		todo_broadcast = 1;
+		break;
 	case 'o':
 		no_bind = 1;
 		break;
@@ -161,6 +170,26 @@ int main(int argc, char *argv[])
 	if (ret < 0)
 		err(1, "socket(j1939)");
 
+	if (todo_promisc) {
+		if (verbose)
+			fprintf(stderr, "- setsockopt(, SOL_SOCKET, SO_J1939_PROMISC, %d, %zd);\n",
+				todo_promisc, sizeof(todo_promisc));
+		ret = setsockopt(sock, SOL_CAN_J1939, SO_J1939_PROMISC,
+				 &todo_promisc, sizeof(todo_promisc));
+		if (ret < 0)
+			err(1, "setsockopt: filed to set promiscuous mode");
+	}
+
+	if (todo_broadcast) {
+		if (verbose)
+			fprintf(stderr, "- setsockopt(, SOL_SOCKET, SO_BROADCAST, %d, %zd);\n",
+				todo_broadcast, sizeof(todo_broadcast));
+		ret = setsockopt(sock, SOL_SOCKET, SO_BROADCAST,
+				 &todo_broadcast, sizeof(todo_broadcast));
+		if (ret < 0)
+			err(1, "setsockopt: filed to set broadcast");
+	}
+
 	if (todo_prio >= 0) {
 		if (verbose)
 			fprintf(stderr, "- setsockopt(, SOL_CAN_J1939, SO_J1939_SEND_PRIO, &%i);\n", todo_prio);