The MOTD used to ride on tui_render_command_output's coattails — text
got stuffed into client->command_output prefixed by "=== 公告 / MOTD ==="
and rendered under a reverse-video " COMMAND OUTPUT " title bar. Two
different things (a transient command result vs. a one-shot service
notice) wearing the same chrome.
Now MOTD has its own renderer with its own aesthetic:
╭─ 公告 / MOTD ────────────────────────────────╮
欢迎来到 TNT 公共聊天室。
请互相尊重，不要刷屏。
管理员：m1ng
╰─ 按任意键继续 / press any key ────────────────╯
- title chip embedded in the top border (bright cyan)
- footer hint embedded in the bottom border (dim grey)
- 2-column left padding on body lines, blank top/bottom pad rows
- dim cyan borders, no full-line reverse anywhere
Wiring:
- new tui_render_motd() declared in tui.h
- new client_t.show_motd flag selects the renderer; command_output
remains the text storage (no extra buffer needed)
- input.c MOTD path sets show_motd = true and calls tui_render_motd()
- handle_key's dismiss path clears show_motd alongside command_output
- main-loop redraw dispatch checks show_motd before command_output[0]
Replace the four lines of `==` rules + bilingual title with a centred
rounded box so the eye lands on a single visual element instead of two.
The new tui_render_welcome():
- centres horizontally and vertically (about a third of the way down)
- shows TNT + version, then 中文 subtitle, then English caption with
decreasing visual weight (bold cyan / default / dim grey)
- falls back to a plain "TNT $version — anonymous chat over SSH" line
when the terminal is too narrow for the frame
- declared in tui.h, called from input.c read_username()
read_username()'s prompt becomes a single short bilingual hint
("请输入用户名 (留空 anonymous): ") that lives below the box.
- Implement SSH server using libssh for secure connections
- Replace insecure telnet with encrypted SSH protocol
- Add automatic terminal size detection via PTY requests
- Support dynamic window resize (SIGWINCH handling)
- Fix UI display bug by using SSH channel instead of fd
- Update tui_clear_screen to work with SSH connections
- Add RSA host key auto-generation on first run
- Update README with SSH instructions and security notes
- Add libssh dependency to Makefile with auto-detection
- Remove all telnet-related code
Security improvements:
- All traffic now encrypted
- Host key authentication
- No more plaintext transmission
