Extcap programs must write to the packet pipe in binary mode.

It doesn't matter on UN*X, but it definitely matters on Windows; we're
writing a pcap file, not a text file, so every byte we write should go
down the pipe as is.

Bug: 14989
Change-Id: I26c067b8ff5dba644a579846dd97b568a81c7053
Reviewed-on: https://code.wireshark.org/review/28764
Reviewed-by: Guy Harris <guy@alum.mit.edu>

extcap/ciscodump.c

@@ -418,7 +418,7 @@ static int ssh_open_remote_connection(const char* hostname, const unsigned int p
 
 	if (g_strcmp0(fifo, "-")) {
 		/* Open or create the output file */
-		fp = fopen(fifo, "w");
+		fp = fopen(fifo, "wb");
 		if (!fp) {
 			g_warning("Error creating output file: %s", g_strerror(errno));
 			return EXIT_FAILURE;

extcap/dpauxmon.c

@@ -107,7 +107,7 @@ static int setup_dumpfile(const char* fifo, FILE** fp)
 		return EXIT_SUCCESS;
 	}
 
-	*fp = fopen(fifo, "w");
+	*fp = fopen(fifo, "wb");
 	if (!(*fp)) {
 		g_warning("Error creating output file: %s", g_strerror(errno));
 		return EXIT_FAILURE;

extcap/udpdump.c

@@ -172,7 +172,7 @@ static int setup_dumpfile(const char* fifo, FILE** fp)
 		return EXIT_SUCCESS;
 	}
 
-	*fp = fopen(fifo, "w");
+	*fp = fopen(fifo, "wb");
 	if (!(*fp)) {
 		g_warning("Error creating output file: %s", g_strerror(errno));
 		return EXIT_FAILURE;