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540 lines
18 KiB
540 lines
18 KiB
3 years ago
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//#define LOG_LOCAL_LEVEL ESP_LOG_DEBUG
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#include <stddef.h>
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#include <stdint.h>
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#include <sys/queue.h>
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#include <malloc.h>
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#include <stdbool.h>
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#include <esp_log.h>
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#include <linenoise/linenoise.h>
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#include <esp_system.h>
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#include "telnet_parser.h"
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#include "console_server.h"
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static const char *TAG = "telnet";
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// The console is all single-threaded, using a circular buffer, so we can get away
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// with a global state here
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enum telnet_code {
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CODE_SE = 240,
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CODE_NOP = 241,
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CODE_DATA_MARK = 242,
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CODE_BRK = 243, // break signal - kick all clients (including yourself)
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CODE_IP = 244, // interrupt process (reboots ESP)
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CODE_AO = 245, // abort output
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CODE_AYT = 246, // are you there? (sends an ASCII text reply)
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CODE_ERASE_CHAR = 247, // these are obsolete
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CODE_ERASE_LINE = 248,
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CODE_GO_AHEAD = 249, // not used, always negotiate to SGA
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CODE_SB = 250,
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CODE_WILL = 251,
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CODE_WONT = 252,
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CODE_DO = 253,
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CODE_DONT = 254,
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CODE_IAC = 255
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};
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enum parser_state {
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// next character is expected to be text or IAC
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PS_TEXT = 0,
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// received IAC, next character should be a verb
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PS_IAC,
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PS_WILL,
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PS_WONT,
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PS_DO,
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PS_DONT,
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PS_SUBNEG,
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PS_SUBNEG_BODY,
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PS_SUBNEG_BODY_IAC
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};
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struct awaiting_reply_item;
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struct awaiting_reply_item {
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enum telnet_code code;
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enum telnet_option option;
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SLIST_ENTRY(awaiting_reply_item) next;
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};
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SLIST_HEAD(awaiting_reply_list, awaiting_reply_item);
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#define SUBNEG_BUF_LEN 16
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static struct telnet_state {
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enum parser_state pstate;
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enum telnet_option subneg_option;
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struct awaiting_reply_list awaiting_reply;
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uint8_t subneg_buf[SUBNEG_BUF_LEN];
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uint8_t subneg_buf_i;
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bool mode_rx_binary;
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bool mode_tx_binary;
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} s_ts = { /* all zeros */ };
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static void _expect_reply(enum telnet_code code, enum telnet_option option)
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{
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ESP_LOGV(TAG, "Awaiting reply to %d:0x%02x", code, option);
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struct awaiting_reply_item *item = calloc(sizeof(struct awaiting_reply_item), 1);
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item->code = code;
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item->option = option;
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SLIST_INSERT_HEAD(&s_ts.awaiting_reply, item, next);
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}
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static void send_will(console_ctx_t *cctx, enum telnet_option opt, bool is_response)
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{
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ESP_LOGD(TAG, "Send WILL 0x%02x", opt);
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if (!is_response) _expect_reply(CODE_WILL, opt);
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const uint8_t buf[3] = {CODE_IAC, CODE_WILL, opt};
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console_write_ctx(cctx, (const char *) buf, 3);
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}
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static void send_wont(console_ctx_t *cctx, enum telnet_option opt, bool is_response)
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{
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ESP_LOGD(TAG, "Send WON'T 0x%02x", opt);
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if (!is_response) _expect_reply(CODE_WONT, opt);
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const uint8_t buf[3] = {CODE_IAC, CODE_WONT, opt};
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console_write_ctx(cctx, (const char *) buf, 3);
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}
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static void send_do(console_ctx_t *cctx, enum telnet_option opt, bool is_response)
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{
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ESP_LOGD(TAG, "Send DO 0x%02x", opt);
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if (!is_response) _expect_reply(CODE_DO, opt);
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const uint8_t buf[3] = {CODE_IAC, CODE_DO, opt};
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console_write_ctx(cctx, (const char *) buf, 3);
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}
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static void send_dont(console_ctx_t *cctx, enum telnet_option opt, bool is_response)
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{
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ESP_LOGD(TAG, "Send DON'T 0x%02x", opt);
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if (!is_response) _expect_reply(CODE_DONT, opt);
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const uint8_t buf[3] = {CODE_IAC, CODE_DONT, opt};
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console_write_ctx(cctx, (const char *) buf, 3);
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}
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static void send_subnegotiate(console_ctx_t *cctx, enum telnet_option opt, const uint8_t *data, size_t len, bool is_response)
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{
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if (!is_response) _expect_reply(CODE_SB, opt);
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ESP_LOGD(TAG, "Send SUBNEG 0x%02x", opt);
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const uint8_t hdr[] = {CODE_IAC, CODE_SB, opt};
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console_write_ctx(cctx, (const char *) hdr, 3);
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// a heroic attempt at doing the double-IAC encoding without malloc
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const uint8_t *last_chunk = data;
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const uint8_t a_iac = CODE_IAC;
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for (int i = 0; i < len; i++) {
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if (data[i] == CODE_IAC) {
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if (last_chunk != &data[i]) {
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console_write_ctx(cctx, (const char *) last_chunk, &data[i] - last_chunk);
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console_write_ctx(cctx, (const char *) &a_iac, 1);
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last_chunk = &data[i+1];
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}
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}
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}
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if (last_chunk != &data[len]) {
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console_write_ctx(cctx, (const char *) last_chunk, &data[len] - last_chunk);
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}
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const uint8_t foot[] = {CODE_IAC, CODE_SE};
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console_write_ctx(cctx, (const char *) foot, 2);
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}
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void telnet_send_subnegotiate(console_ctx_t *cctx, enum telnet_option opt, const uint8_t *data, size_t len)
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{
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send_subnegotiate(cctx, opt, data, len, false);
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}
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void telnet_send_will(console_ctx_t *cctx, enum telnet_option opt)
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{
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send_will(cctx, opt, false);
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}
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void telnet_send_wont(console_ctx_t *cctx, enum telnet_option opt)
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{
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send_wont(cctx, opt, false);
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}
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void telnet_send_do(console_ctx_t *cctx, enum telnet_option opt)
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{
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send_do(cctx, opt, false);
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}
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void telnet_send_dont(console_ctx_t *cctx, enum telnet_option opt)
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{
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send_dont(cctx, opt, false);
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}
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/**
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* Peer agreed to DO something,
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* or announces it WILL do something
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*/
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static void handle_will(console_ctx_t *cctx, enum telnet_option opt)
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{
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struct awaiting_reply_item *it;
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SLIST_FOREACH(it, &s_ts.awaiting_reply, next) {
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if (it->option == opt) {
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if (it->code == CODE_DO) {
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ESP_LOGD(TAG, "Peer agreed to DO 0x%02x", opt);
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} else if (it->code == CODE_DONT) {
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ESP_LOGW(TAG, "Peer refused to NOT DO 0x%02x", opt);
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// TODO deal with it
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} else {
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continue; // leave this entry alone, it's not related
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}
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SLIST_REMOVE(&s_ts.awaiting_reply, it, awaiting_reply_item, next);
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free(it);
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return;
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}
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}
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// unexpected WILL - peer offers to enable an option
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switch (opt) {
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case OPT_BINARY:
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send_do(cctx, opt, true);
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s_ts.mode_rx_binary = true;
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break;
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case OPT_ECHO:
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send_dont(cctx, opt, true);
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// that's a bad idea, don't do it
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break;
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case OPT_SUPPRESS_GO_AHEAD:
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send_do(cctx, opt, true);
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break;
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default:
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ESP_LOGD(TAG, "unknown option for WILL: 0x%02x", opt);
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// please don't, we don't understand what it is
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send_dont(cctx, opt, true);
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}
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}
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/**
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* Peer refused to DO something,
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* or announces it WON'T do something
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*/
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static void handle_wont(console_ctx_t *cctx, enum telnet_option opt)
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{
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struct awaiting_reply_item *it;
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SLIST_FOREACH(it, &s_ts.awaiting_reply, next) {
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if (it->option == opt) {
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if (it->code == CODE_DO) {
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ESP_LOGW(TAG, "Peer refused to DO 0x%02x", opt);
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// TODO deal with it
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} else if (it->code == CODE_DONT) {
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ESP_LOGD(TAG, "Peer agreed to NOT DO 0x%02x", opt);
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} else {
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continue; // leave this entry alone, it's not related
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}
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SLIST_REMOVE(&s_ts.awaiting_reply, it, awaiting_reply_item, next);
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free(it);
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return;
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}
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}
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// unexpected WON'T - peer offers to disable an option
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switch (opt) {
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case OPT_BINARY:
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send_dont(cctx, opt, true);
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s_ts.mode_rx_binary = false;
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break;
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case OPT_ECHO:
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send_dont(cctx, opt, true);
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// OK, we don't care
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break;
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case OPT_SUPPRESS_GO_AHEAD:
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// We want SGA, GA is some legacy nonsense nobody uses
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send_do(cctx, opt, true);
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break;
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// TODO handle supported options
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default:
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ESP_LOGD(TAG, "unknown option for WON'T: 0x%02x", opt);
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// yeah sure, don't do it, whatever
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send_dont(cctx, opt, true);
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}
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}
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/**
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* Peer requests we DO something,
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* or agrees to something we announced with WILL
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*/
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static void handle_do(console_ctx_t *cctx, enum telnet_option opt)
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{
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struct awaiting_reply_item *it;
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SLIST_FOREACH(it, &s_ts.awaiting_reply, next) {
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if (it->option == opt) {
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if (it->code == CODE_WONT) {
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ESP_LOGW(TAG, "Peer rejected that we WON'T 0x%02x", opt);
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// TODO deal with it
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} else if (it->code == CODE_WILL) {
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ESP_LOGD(TAG, "Peer accepted that we WILL 0x%02x", opt);
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} else {
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continue; // leave this entry alone, it's not related
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}
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SLIST_REMOVE(&s_ts.awaiting_reply, it, awaiting_reply_item, next);
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free(it);
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return;
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}
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}
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// unexpected DO - peer requests we do something
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switch (opt) {
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case OPT_BINARY:
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send_will(cctx, opt, true);
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s_ts.mode_tx_binary = true;
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break;
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case OPT_ECHO:
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// FIXME
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send_wont(cctx, opt, true);
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// send_will(cctx, opt, true);
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// linenoiseSetEchoMode(1);
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break;
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case OPT_SUPPRESS_GO_AHEAD:
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send_will(cctx, opt, true);
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break;
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case OPT_STATUS:
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send_will(cctx, opt, true);
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break;
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case OPT_TIMING_MARK:
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send_will(cctx, opt, true);
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break;
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// TODO handle supported options
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default:
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ESP_LOGD(TAG, "unknown option for DO: 0x%02x", opt);
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// we don't know how to do that, so we won't
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send_wont(cctx, opt, true);
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}
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}
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/**
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* Peer requests we DON'T do something,
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* or agrees we shouldn't do something we announced for with WON'T
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*/
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static void handle_dont(console_ctx_t *cctx, enum telnet_option opt)
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{
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struct awaiting_reply_item *it;
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SLIST_FOREACH(it, &s_ts.awaiting_reply, next) {
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if (it->option == opt) {
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if (it->code == CODE_WILL) {
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ESP_LOGW(TAG, "Peer rejected that we WILL 0x%02x", opt);
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// TODO deal with it
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switch (opt) {
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case OPT_ECHO:
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// ok, let's not echo then
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// FIXME
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// linenoiseSetEchoMode(0);
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break;
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default:
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ESP_LOGW(TAG, "Rejection unhandled");
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}
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} else if (it->code == CODE_WONT) {
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ESP_LOGD(TAG, "Peer accepted that we WON'T 0x%02x", opt);
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} else {
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continue; // leave this entry alone, it's not related
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}
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SLIST_REMOVE(&s_ts.awaiting_reply, it, awaiting_reply_item, next);
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free(it);
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return;
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}
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}
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// unexpected DON'T - peer requests we don't do something
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switch (opt) {
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case OPT_BINARY:
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send_wont(cctx, opt, true);
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s_ts.mode_tx_binary = false;
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break;
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case OPT_ECHO:
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send_wont(cctx, opt, true);
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// FIXME
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// linenoiseSetEchoMode(0);
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break;
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case OPT_SUPPRESS_GO_AHEAD:
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// no, we absolutely won't use GA
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send_will(cctx, opt, true);
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break;
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// TODO handle supported options
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||
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|
default:
|
||
|
|
ESP_LOGD(TAG, "unknown option for DON'T: 0x%02x", opt);
|
||
|
|
// false is probably the default, so we won't do that, ok...
|
||
|
|
send_wont(cctx, opt, true);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* subnegotiation command (ts.subneg_option) was received and is now stored in
|
||
|
|
* ts.subneg_buf[0 .. ts.subneg_buf_i]. Handle it accordingly
|
||
|
|
*/
|
||
|
|
static void handle_subnegotiate(void)
|
||
|
|
{
|
||
|
|
struct awaiting_reply_item *it;
|
||
|
|
SLIST_FOREACH(it, &s_ts.awaiting_reply, next) {
|
||
|
|
if (it->code == CODE_SB && it->option == s_ts.subneg_option) {
|
||
|
|
// this is an expected reply, delete the await token
|
||
|
|
SLIST_REMOVE(&s_ts.awaiting_reply, it, awaiting_reply_item, next);
|
||
|
|
ESP_LOGD(TAG, "got reply to SB 0x%02x", s_ts.subneg_option);
|
||
|
|
|
||
|
|
// TODO now we would handle the received data
|
||
|
|
free(it);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// it was not a reply to our request, i.e. the client is asking for something
|
||
|
|
|
||
|
|
ESP_LOGW(TAG, "recv unsupported subneg request 0x%02x", s_ts.subneg_option);
|
||
|
|
|
||
|
|
// TODO handle some requests..
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t telnet_middleware_read(console_ctx_t *cctx, uint8_t *buffer, size_t len)
|
||
|
|
{
|
||
|
|
ESP_LOGV(TAG, "-- Telnet handle %d chars --", len);
|
||
|
|
ESP_LOG_BUFFER_HEX_LEVEL(TAG, buffer, (uint16_t) len, ESP_LOG_VERBOSE);
|
||
|
|
|
||
|
|
uint8_t *wp = buffer;
|
||
|
|
for (size_t i = 0; i < len; i++) {
|
||
|
|
uint8_t c = buffer[i];
|
||
|
|
|
||
|
|
if (c >= 32 && c < 127) {
|
||
|
|
ESP_LOGV(TAG, "char %d (%c)", c, c);
|
||
|
|
} else {
|
||
|
|
ESP_LOGV(TAG, "char %d", c);
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (s_ts.pstate) {
|
||
|
|
case PS_TEXT:
|
||
|
|
if (c == CODE_IAC) {
|
||
|
|
ESP_LOGV(TAG, "TEXT->IAC");
|
||
|
|
s_ts.pstate = PS_IAC;
|
||
|
|
} else {
|
||
|
|
ESP_LOGV(TAG, "TEXT(%c)", c);
|
||
|
|
*wp++ = c;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case PS_IAC:
|
||
|
|
switch (c) {
|
||
|
|
case CODE_IAC:
|
||
|
|
// double IAC means literal IAC (but this shouldn't normally happen)
|
||
|
|
*wp++ = c;
|
||
|
|
s_ts.pstate = PS_TEXT;
|
||
|
|
ESP_LOGV(TAG, "Double IAC in TEXT");
|
||
|
|
break;
|
||
|
|
case CODE_WILL:
|
||
|
|
ESP_LOGV(TAG, "IAC->WILL");
|
||
|
|
s_ts.pstate = PS_WILL;
|
||
|
|
break;
|
||
|
|
case CODE_WONT:
|
||
|
|
ESP_LOGV(TAG, "IAC->WONT");
|
||
|
|
s_ts.pstate = PS_WONT;
|
||
|
|
break;
|
||
|
|
case CODE_DO:
|
||
|
|
ESP_LOGV(TAG, "IAC->DO");
|
||
|
|
s_ts.pstate = PS_DO;
|
||
|
|
break;
|
||
|
|
case CODE_DONT:
|
||
|
|
ESP_LOGV(TAG, "IAC->DONT");
|
||
|
|
s_ts.pstate = PS_DONT;
|
||
|
|
break;
|
||
|
|
case CODE_SB:
|
||
|
|
ESP_LOGV(TAG, "IAC->SUBNEG");
|
||
|
|
s_ts.pstate = PS_SUBNEG;
|
||
|
|
break;
|
||
|
|
case CODE_AYT:
|
||
|
|
ESP_LOGV(TAG, "IAC->AYT");
|
||
|
|
s_ts.pstate = PS_TEXT;
|
||
|
|
const char *reply = "\r\nI am here.\r\n";
|
||
|
|
console_write_ctx(cctx, reply, strlen(reply));
|
||
|
|
break;
|
||
|
|
case CODE_IP:
|
||
|
|
ESP_LOGV(TAG, "IAC->IP, reboot");
|
||
|
|
esp_restart();
|
||
|
|
break;
|
||
|
|
case CODE_BRK:
|
||
|
|
ESP_LOGV(TAG, "IAC->BRK, kick clients");
|
||
|
|
telnetsrv_kick_all();
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
ESP_LOGW(TAG, "Unexpected code IAC+%d, discard!", c);
|
||
|
|
// Unecpected character, discard and go to base state
|
||
|
|
s_ts.pstate = PS_TEXT;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case PS_WILL:
|
||
|
|
handle_will(cctx, c);
|
||
|
|
s_ts.pstate = PS_TEXT;
|
||
|
|
ESP_LOGV(TAG, "WILL->TEXT");
|
||
|
|
break;
|
||
|
|
case PS_WONT:
|
||
|
|
handle_wont(cctx, c);
|
||
|
|
s_ts.pstate = PS_TEXT;
|
||
|
|
ESP_LOGV(TAG, "WONT->TEXT");
|
||
|
|
break;
|
||
|
|
case PS_DO:
|
||
|
|
handle_do(cctx, c);
|
||
|
|
s_ts.pstate = PS_TEXT;
|
||
|
|
ESP_LOGV(TAG, "DO->TEXT");
|
||
|
|
break;
|
||
|
|
case PS_DONT:
|
||
|
|
handle_dont(cctx, c);
|
||
|
|
s_ts.pstate = PS_TEXT;
|
||
|
|
ESP_LOGV(TAG, "DONT->TEXT");
|
||
|
|
break;
|
||
|
|
case PS_SUBNEG:
|
||
|
|
s_ts.subneg_option = c;
|
||
|
|
s_ts.pstate = PS_SUBNEG_BODY;
|
||
|
|
s_ts.subneg_buf_i = 0;
|
||
|
|
ESP_LOGV(TAG, "SUBNEG->SUBNEG_BODY, opt %d", c);
|
||
|
|
break;
|
||
|
|
case PS_SUBNEG_BODY:
|
||
|
|
if (c == CODE_IAC) {
|
||
|
|
ESP_LOGV(TAG, "IAC in subneg body");
|
||
|
|
s_ts.pstate = PS_SUBNEG_BODY_IAC;
|
||
|
|
} else {
|
||
|
|
if (s_ts.subneg_buf_i < SUBNEG_BUF_LEN) {
|
||
|
|
ESP_LOGV(TAG, "subneg += %d", c);
|
||
|
|
s_ts.subneg_buf[s_ts.subneg_buf_i++] = c;
|
||
|
|
} else {
|
||
|
|
ESP_LOGV(TAG, "subneg too long!");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case PS_SUBNEG_BODY_IAC:
|
||
|
|
switch (c) {
|
||
|
|
case CODE_IAC:
|
||
|
|
ESP_LOGV(TAG, "Literal IAC in subneg");
|
||
|
|
// double IAC means literal IAC code
|
||
|
|
s_ts.subneg_buf[s_ts.subneg_buf_i++] = CODE_IAC;
|
||
|
|
s_ts.pstate = PS_SUBNEG_BODY;
|
||
|
|
break;
|
||
|
|
case CODE_SE:
|
||
|
|
ESP_LOGV(TAG, "Subneg END");
|
||
|
|
// end of subneg block
|
||
|
|
if (s_ts.subneg_buf_i == SUBNEG_BUF_LEN) {
|
||
|
|
ESP_LOGW(TAG, "Subneg buf OV, discard command SB %d!", s_ts.subneg_option);
|
||
|
|
} else {
|
||
|
|
ESP_LOGV(TAG, "Subneg OK! Handling...");
|
||
|
|
handle_subnegotiate();
|
||
|
|
}
|
||
|
|
s_ts.pstate = PS_TEXT;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
ESP_LOGV(TAG, "Illegal char in subneg IAC+%d, discard", c);
|
||
|
|
// illegal character, act like the subneg block was closed, but discard the content
|
||
|
|
s_ts.pstate = PS_TEXT;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t remains = wp - buffer;
|
||
|
|
|
||
|
|
ESP_LOGV(TAG, "Remain %d cleartext chars", remains);
|
||
|
|
ESP_LOGV(TAG, "> %*.s", remains, buffer);
|
||
|
|
return remains;
|
||
|
|
}
|