s_addr is always unsigned 32bit, long is not.

ext/ftp/ftp.c

@@ -775,7 +775,8 @@ ftp_pasv(ftpbuf_t *ftp, int pasv)
 	}
 	sin = (struct sockaddr_in *) sa;
 	sin->sin_family = AF_INET;
-	sin->sin_addr.s_addr = ipbox.l[0];
+	/* Deal with differing integer sizes */
+	memcpy(&(sin->sin_addr.s_addr), &(ipbox.c[0]), 4);
 	sin->sin_port = ipbox.s[2];
 
 	ftp->pasv = 2;
@@ -1480,7 +1481,7 @@ ftp_getdata(ftpbuf_t *ftp TSRMLS_DC)
 #endif
 
 	/* send the PORT */
-	ipbox.l[0] = ((struct sockaddr_in*) sa)->sin_addr.s_addr;
+	memcpy(&(ipbox.c[0]), &(((struct sockaddr_in*) sa)->sin_addr.s_addr), 4);
 	ipbox.s[2] = ((struct sockaddr_in*) &addr)->sin_port;
 	sprintf(arg, "%u,%u,%u,%u,%u,%u", ipbox.c[0], ipbox.c[1], ipbox.c[2], ipbox.c[3], ipbox.c[4], ipbox.c[5]);