net: When checking prerequisites, consider boot_file_name

For net_boot_common, we allow the serverip to be specified as part of
the boot file name. For net commands that require serverip, include that
source as a valid specification of serverip.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Alexander Graf <agraf@suse.de>

include/net.h

@@ -839,6 +839,9 @@ ushort env_get_vlan(char *);
 /* copy a filename (allow for "..." notation, limit length) */
 void copy_filename(char *dst, const char *src, int size);
 
+/* check if serverip is specified in filename from the command line */
+int is_serverip_in_cmd(void);
+
 /* get a random source port */
 unsigned int random_port(void);
 

net/net.c

@@ -1341,7 +1341,7 @@ static int net_check_prereq(enum proto_t protocol)
 		/* Fall through */
 	case TFTPGET:
 	case TFTPPUT:
-		if (net_server_ip.s_addr == 0) {
+		if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
 			puts("*** ERROR: `serverip' not set\n");
 			return 1;
 		}
@@ -1512,6 +1512,11 @@ void copy_filename(char *dst, const char *src, int size)
 	*dst = '\0';
 }
 
+int is_serverip_in_cmd(void)
+{
+	return !!strchr(net_boot_file_name, ':');
+}
+
 #if	defined(CONFIG_CMD_NFS)		|| \
 	defined(CONFIG_CMD_SNTP)	|| \
 	defined(CONFIG_CMD_DNS)