Swatantra Yadav a4b6b8b8bf Documentation/netutils: add comprehensive guide for ftpd ... Provide a complete documentation guide for the ftpd (FTP server) network utility in Documentation/applications/netutils/ftpd/index.rst, replacing the previous 6-line placeholder stub. Includes: - Protocol architecture overview (control/data connection separation, multi-session worker pthreads, VFS mapping) - Security considerations regarding unencrypted plaintext FTP credentials, mandatory credential hardening, home directory isolation, and encrypted password authentication - Comprehensive supported RFC 959 / RFC 2428 / RFC 3659 FTP commands reference table - Configuration options table and networking prerequisites (CONFIG_NETUTILS_FTPD, worker stack size, buffer sizes) - NSH terminal usage (ftpd -4 / -6, ftpd_stop) with address-family flag requirements and configured account placeholders - External client connection walkthroughs (FTP CLI, cURL) using configured account and anonymous workflows - Public C API reference for types, account flags, and lifecycle functions (ftpd_open, ftpd_adduser, ftpd_session, ftpd_close) - Complete, runnable C application example demonstrating multi-user server setup, signal-driven termination (SIGINT/SIGTERM) with atomic sig_atomic_t state, POSIX kill stop routine, and credential placeholders - Embedded design and resource tuning guidelines (stack sizing, flash/SD card I/O buffering, and NAT passive mode) Addresses #11081 Assisted-by: Google Gemini Signed-off-by: Swatantra Yadav <maverickswatantra@gmail.com>		2026-10-09 12:08:21 +08:00
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index.rst