Add and use file_remote

main.c

@@ -72,6 +72,7 @@ int main(int argc, char **argv)
 		.ul_timeout = 120000,
 		.tftpcmd = NULL,
 		.file_local = NULL,
+		.file_remote = NULL,
 		.ipaddr = NULL,
 		.ipmask = "255.255.255.0",
 		.intf = NULL,

nmrp.c

@@ -315,6 +315,14 @@ int nmrp_do(struct nmrpd_args *args)
 		return 1;
 	}
 
+	if (args->file_remote) {
+		if (!tftp_is_valid_filename(args->file_remote)) {
+			fprintf(stderr, "Invalid remote filename '%s'.\n",
+					args->file_remote);
+			return 1;
+		}
+	}
+
 	err = 1;
 
 	sock = ethsock_create(args->intf, ETH_P_NMRP);
@@ -437,15 +445,21 @@ int nmrp_do(struct nmrpd_args *args)
 					break;
 				}
 
-				if (verbosity) {
+				len = 0;
-					len = 0;
+				filename = msg_opt_data(&rx.msg, NMRP_O_FILE_NAME, &len);
-					filename = msg_opt_data(&rx.msg, NMRP_O_FILE_NAME, &len);
+				if (filename) {
-					if (filename) {
+					if (!args->file_remote) {
-						printf("Received upload request for '%.*s'.\n", len,
+						args->file_remote = filename;
-								filename);
-					} else {
-						printf("No filename specified in upload request.");
 					}
+					printf("Received upload request: filename '%.*s'.\n",
+							len, filename);
+				} else if (!args->file_remote) {
+					if (tftp_is_valid_filename(args->file_local)) {
+						args->file_remote = args->file_local;
+					} else {
+						args->file_remote = "firmware";
+					}
+					printf("Received upload request with empty filename.");
 				}
 
 				err = 0;
@@ -462,6 +476,11 @@ int nmrp_do(struct nmrpd_args *args)
 				}
 
 				if (!err && args->file_local) {
+					if (verbosity) {
+						printf("Using remote filename '%s'.\n",
+								args->file_remote);
+					}
+
 					if (!strcmp(args->file_local, "-")) {
 						printf("Uploading from stdin ... ");
 					} else {

nmrpd.h

@@ -60,6 +60,7 @@ struct nmrpd_args {
 	unsigned ul_timeout;
 	const char *tftpcmd;
 	const char *file_local;
+	const char *file_remote;
 	const char *ipaddr;
 	const char *ipmask;
 	const char *intf;
@@ -70,6 +71,8 @@ struct nmrpd_args {
 };
 
 int tftp_put(struct nmrpd_args *args);
+bool tftp_is_valid_filename(const char *filename);
+
 int nmrp_do(struct nmrpd_args *args);
 
 int select_fd(int fd, unsigned timeout);

tftp.c

@@ -86,7 +86,7 @@ static void pkt_mkwrq(char *pkt, const char *filename)
 	size_t len = 2;
 
 	filename = leafname(filename);
-	if (!is_netascii(filename) || strlen(filename) > 500) {
+	if (!tftp_is_valid_filename(filename)) {
 		fprintf(stderr, "Overlong/illegal filename; using 'firmware'.\n");
 		filename = "firmware";
 	} else if (!strcmp(filename, "-")) {
@@ -223,6 +223,11 @@ inline void sock_perror(const char *msg)
 }
 #endif
 
+inline bool tftp_is_valid_filename(const char *filename)
+{
+	return strlen(filename) <= 500 && is_netascii(filename);
+}
+
 int tftp_put(struct nmrpd_args *args)
 {
 	struct sockaddr_in addr;
@@ -267,7 +272,7 @@ int tftp_put(struct nmrpd_args *args)
 	/* Not really, but this way the loop sends our WRQ before receiving */
 	timeout = 1;
 
-	pkt_mkwrq(tx, args->file_local);
+	pkt_mkwrq(tx, args->file_remote);
 
 	do {
 		if (!timeout && pkt_num(rx) == ACK) {