测试程序可以使用

Drivers/BSP/NET/lftpd/lftpd.c

@@ -350,7 +350,14 @@ static int cmd_pass(lftpd_client_t *client, const char *arg)
 
 static int cmd_pasv(lftpd_client_t *client, const char *arg)
 {
-    int listener_socket = lftpd_inet_listen(0);
+    int listener_socket = -1;
+    int retry;
+
+    for (retry = 0; retry < 3; retry++) {
+        listener_socket = lftpd_inet_listen(0);
+        if (listener_socket >= 0) break;
+        vTaskDelay(pdMS_TO_TICKS(200));
+    }
     if (listener_socket < 0) {
         send_simple_response(client->socket, 425, STATUS_425);
         return -1;

Drivers/BSP/NET/lftpd/lftpd_io.c

@@ -6,6 +6,27 @@
 #include "ff.h"
 #include "private/lftpd_io.h"
 
+#define DBG_TAG "[LFT_IO]"
+#include "dbg_log.h"
+
+/*
+ * FatFS 在 FF_USE_LFN=0 时不接受 "/" 前缀路径。
+ * 剥离前导 "/" 后用 FatFS 兼容路径，根目录用 "." 替代空字符串。
+ */
+static const char *to_fatfs_path(const char *path)
+{
+    if (path == NULL || *path == '\0') {
+        return ".";
+    }
+    if (*path == '/') {
+        path++;
+        if (*path == '\0') {
+            return ".";
+        }
+    }
+    return path;
+}
+
 static int s_file_open = 0;
 static FIL s_ftp_file;
 
@@ -74,9 +95,13 @@ char *lftpd_io_canonicalize_path(const char *base, const char *name)
 int lftpd_io_open_read(const char *path)
 {
     if (s_file_open) {
+        DBG_ERROR("open_read '%s': already open", path);
         return -1;
     }
-    if (f_open(&s_ftp_file, path, FA_READ) != FR_OK) {
+    const char *fpath = to_fatfs_path(path);
+    FRESULT fr = f_open(&s_ftp_file, fpath, FA_READ);
+    if (fr != FR_OK) {
+        DBG_ERROR("open_read '%s': f_open err=%d", fpath, (int)fr);
         return -1;
     }
     s_file_open = 1;
@@ -86,9 +111,13 @@ int lftpd_io_open_read(const char *path)
 int lftpd_io_open_write(const char *path)
 {
     if (s_file_open) {
+        DBG_ERROR("open_write '%s': already open", path);
         return -1;
     }
-    if (f_open(&s_ftp_file, path, FA_WRITE | FA_CREATE_ALWAYS) != FR_OK) {
+    const char *fpath = to_fatfs_path(path);
+    FRESULT fr = f_open(&s_ftp_file, fpath, FA_WRITE | FA_CREATE_ALWAYS);
+    if (fr != FR_OK) {
+        DBG_ERROR("open_write '%s': f_open err=%d", fpath, (int)fr);
         return -1;
     }
     s_file_open = 1;
@@ -130,8 +159,9 @@ void lftpd_io_close(int handle)
 int lftpd_io_stat(const char *path, uint32_t *p_size, int *p_is_dir)
 {
     FILINFO fno;
+    const char *fpath = to_fatfs_path(path);
 
-    if (f_stat(path, &fno) != FR_OK) {
+    if (f_stat(fpath, &fno) != FR_OK) {
         return -1;
     }
 
@@ -147,7 +177,8 @@ int lftpd_io_stat(const char *path, uint32_t *p_size, int *p_is_dir)
 
 int lftpd_io_unlink(const char *path)
 {
-    if (f_unlink(path) == FR_OK) {
+    const char *fpath = to_fatfs_path(path);
+    if (f_unlink(fpath) == FR_OK) {
         return 0;
     }
     return -1;
@@ -159,7 +190,8 @@ void *lftpd_io_opendir(const char *path)
     if (dp == NULL) {
         return NULL;
     }
-    if (f_opendir(dp, path) != FR_OK) {
+    const char *fpath = to_fatfs_path(path);
+    if (f_opendir(dp, fpath) != FR_OK) {
         free(dp);
         return NULL;
     }