| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <ctype.h> |
| 4 | |
| 5 | #include "putty.h" |
| 6 | |
| 7 | #ifndef FALSE |
| 8 | #define FALSE 0 |
| 9 | #endif |
| 10 | #ifndef TRUE |
| 11 | #define TRUE 1 |
| 12 | #endif |
| 13 | |
| 14 | #define RLOGIN_MAX_BACKLOG 4096 |
| 15 | |
| 16 | typedef struct rlogin_tag { |
| 17 | const struct plug_function_table *fn; |
| 18 | /* the above field _must_ be first in the structure */ |
| 19 | |
| 20 | Socket s; |
| 21 | int bufsize; |
| 22 | int firstbyte; |
| 23 | int term_width, term_height; |
| 24 | void *frontend; |
| 25 | } *Rlogin; |
| 26 | |
| 27 | static void rlogin_size(void *handle, int width, int height); |
| 28 | |
| 29 | static void c_write(Rlogin rlogin, char *buf, int len) |
| 30 | { |
| 31 | int backlog = from_backend(rlogin->frontend, 0, buf, len); |
| 32 | sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); |
| 33 | } |
| 34 | |
| 35 | static int rlogin_closing(Plug plug, const char *error_msg, int error_code, |
| 36 | int calling_back) |
| 37 | { |
| 38 | Rlogin rlogin = (Rlogin) plug; |
| 39 | if (rlogin->s) { |
| 40 | sk_close(rlogin->s); |
| 41 | rlogin->s = NULL; |
| 42 | notify_remote_exit(rlogin->frontend); |
| 43 | } |
| 44 | if (error_msg) { |
| 45 | /* A socket error has occurred. */ |
| 46 | logevent(rlogin->frontend, error_msg); |
| 47 | connection_fatal(rlogin->frontend, "%s", error_msg); |
| 48 | } /* Otherwise, the remote side closed the connection normally. */ |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | static int rlogin_receive(Plug plug, int urgent, char *data, int len) |
| 53 | { |
| 54 | Rlogin rlogin = (Rlogin) plug; |
| 55 | if (urgent == 2) { |
| 56 | char c; |
| 57 | |
| 58 | c = *data++; |
| 59 | len--; |
| 60 | if (c == '\x80') |
| 61 | rlogin_size(rlogin, rlogin->term_width, rlogin->term_height); |
| 62 | /* |
| 63 | * We should flush everything (aka Telnet SYNCH) if we see |
| 64 | * 0x02, and we should turn off and on _local_ flow control |
| 65 | * on 0x10 and 0x20 respectively. I'm not convinced it's |
| 66 | * worth it... |
| 67 | */ |
| 68 | } else { |
| 69 | /* |
| 70 | * Main rlogin protocol. This is really simple: the first |
| 71 | * byte is expected to be NULL and is ignored, and the rest |
| 72 | * is printed. |
| 73 | */ |
| 74 | if (rlogin->firstbyte) { |
| 75 | if (data[0] == '\0') { |
| 76 | data++; |
| 77 | len--; |
| 78 | } |
| 79 | rlogin->firstbyte = 0; |
| 80 | } |
| 81 | if (len > 0) |
| 82 | c_write(rlogin, data, len); |
| 83 | } |
| 84 | return 1; |
| 85 | } |
| 86 | |
| 87 | static void rlogin_sent(Plug plug, int bufsize) |
| 88 | { |
| 89 | Rlogin rlogin = (Rlogin) plug; |
| 90 | rlogin->bufsize = bufsize; |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Called to set up the rlogin connection. |
| 95 | * |
| 96 | * Returns an error message, or NULL on success. |
| 97 | * |
| 98 | * Also places the canonical host name into `realhost'. It must be |
| 99 | * freed by the caller. |
| 100 | */ |
| 101 | static const char *rlogin_init(void *frontend_handle, void **backend_handle, |
| 102 | Config *cfg, |
| 103 | char *host, int port, char **realhost, |
| 104 | int nodelay, int keepalive) |
| 105 | { |
| 106 | static const struct plug_function_table fn_table = { |
| 107 | rlogin_closing, |
| 108 | rlogin_receive, |
| 109 | rlogin_sent |
| 110 | }; |
| 111 | SockAddr addr; |
| 112 | const char *err; |
| 113 | Rlogin rlogin; |
| 114 | |
| 115 | rlogin = snew(struct rlogin_tag); |
| 116 | rlogin->fn = &fn_table; |
| 117 | rlogin->s = NULL; |
| 118 | rlogin->frontend = frontend_handle; |
| 119 | rlogin->term_width = cfg->width; |
| 120 | rlogin->term_height = cfg->height; |
| 121 | rlogin->firstbyte = 1; |
| 122 | *backend_handle = rlogin; |
| 123 | |
| 124 | /* |
| 125 | * Try to find host. |
| 126 | */ |
| 127 | { |
| 128 | char *buf; |
| 129 | buf = dupprintf("Looking up host \"%s\"", host); |
| 130 | logevent(rlogin->frontend, buf); |
| 131 | sfree(buf); |
| 132 | } |
| 133 | addr = name_lookup(host, port, realhost, cfg); |
| 134 | if ((err = sk_addr_error(addr)) != NULL) { |
| 135 | sk_addr_free(addr); |
| 136 | return err; |
| 137 | } |
| 138 | |
| 139 | if (port < 0) |
| 140 | port = 513; /* default rlogin port */ |
| 141 | |
| 142 | /* |
| 143 | * Open socket. |
| 144 | */ |
| 145 | { |
| 146 | char *buf, addrbuf[100]; |
| 147 | sk_getaddr(addr, addrbuf, 100); |
| 148 | buf = dupprintf("Connecting to %s port %d", addrbuf, port); |
| 149 | logevent(rlogin->frontend, buf); |
| 150 | sfree(buf); |
| 151 | } |
| 152 | rlogin->s = new_connection(addr, *realhost, port, 1, 0, |
| 153 | nodelay, keepalive, (Plug) rlogin, cfg); |
| 154 | if ((err = sk_socket_error(rlogin->s)) != NULL) |
| 155 | return err; |
| 156 | |
| 157 | /* |
| 158 | * Send local username, remote username, terminal/speed |
| 159 | */ |
| 160 | |
| 161 | { |
| 162 | char z = 0; |
| 163 | char *p; |
| 164 | sk_write(rlogin->s, &z, 1); |
| 165 | sk_write(rlogin->s, cfg->localusername, |
| 166 | strlen(cfg->localusername)); |
| 167 | sk_write(rlogin->s, &z, 1); |
| 168 | sk_write(rlogin->s, cfg->username, |
| 169 | strlen(cfg->username)); |
| 170 | sk_write(rlogin->s, &z, 1); |
| 171 | sk_write(rlogin->s, cfg->termtype, |
| 172 | strlen(cfg->termtype)); |
| 173 | sk_write(rlogin->s, "/", 1); |
| 174 | for (p = cfg->termspeed; isdigit((unsigned char)*p); p++) continue; |
| 175 | sk_write(rlogin->s, cfg->termspeed, p - cfg->termspeed); |
| 176 | rlogin->bufsize = sk_write(rlogin->s, &z, 1); |
| 177 | } |
| 178 | |
| 179 | return NULL; |
| 180 | } |
| 181 | |
| 182 | static void rlogin_free(void *handle) |
| 183 | { |
| 184 | Rlogin rlogin = (Rlogin) handle; |
| 185 | |
| 186 | if (rlogin->s) |
| 187 | sk_close(rlogin->s); |
| 188 | sfree(rlogin); |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * Stub routine (we don't have any need to reconfigure this backend). |
| 193 | */ |
| 194 | static void rlogin_reconfig(void *handle, Config *cfg) |
| 195 | { |
| 196 | } |
| 197 | |
| 198 | /* |
| 199 | * Called to send data down the rlogin connection. |
| 200 | */ |
| 201 | static int rlogin_send(void *handle, char *buf, int len) |
| 202 | { |
| 203 | Rlogin rlogin = (Rlogin) handle; |
| 204 | |
| 205 | if (rlogin->s == NULL) |
| 206 | return 0; |
| 207 | |
| 208 | rlogin->bufsize = sk_write(rlogin->s, buf, len); |
| 209 | |
| 210 | return rlogin->bufsize; |
| 211 | } |
| 212 | |
| 213 | /* |
| 214 | * Called to query the current socket sendability status. |
| 215 | */ |
| 216 | static int rlogin_sendbuffer(void *handle) |
| 217 | { |
| 218 | Rlogin rlogin = (Rlogin) handle; |
| 219 | return rlogin->bufsize; |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * Called to set the size of the window |
| 224 | */ |
| 225 | static void rlogin_size(void *handle, int width, int height) |
| 226 | { |
| 227 | Rlogin rlogin = (Rlogin) handle; |
| 228 | char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 229 | |
| 230 | rlogin->term_width = width; |
| 231 | rlogin->term_height = height; |
| 232 | |
| 233 | if (rlogin->s == NULL) |
| 234 | return; |
| 235 | |
| 236 | b[6] = rlogin->term_width >> 8; |
| 237 | b[7] = rlogin->term_width & 0xFF; |
| 238 | b[4] = rlogin->term_height >> 8; |
| 239 | b[5] = rlogin->term_height & 0xFF; |
| 240 | rlogin->bufsize = sk_write(rlogin->s, b, 12); |
| 241 | return; |
| 242 | } |
| 243 | |
| 244 | /* |
| 245 | * Send rlogin special codes. |
| 246 | */ |
| 247 | static void rlogin_special(void *handle, Telnet_Special code) |
| 248 | { |
| 249 | /* Do nothing! */ |
| 250 | return; |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Return a list of the special codes that make sense in this |
| 255 | * protocol. |
| 256 | */ |
| 257 | static const struct telnet_special *rlogin_get_specials(void *handle) |
| 258 | { |
| 259 | return NULL; |
| 260 | } |
| 261 | |
| 262 | static Socket rlogin_socket(void *handle) |
| 263 | { |
| 264 | Rlogin rlogin = (Rlogin) handle; |
| 265 | return rlogin->s; |
| 266 | } |
| 267 | |
| 268 | static int rlogin_sendok(void *handle) |
| 269 | { |
| 270 | /* Rlogin rlogin = (Rlogin) handle; */ |
| 271 | return 1; |
| 272 | } |
| 273 | |
| 274 | static void rlogin_unthrottle(void *handle, int backlog) |
| 275 | { |
| 276 | Rlogin rlogin = (Rlogin) handle; |
| 277 | sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); |
| 278 | } |
| 279 | |
| 280 | static int rlogin_ldisc(void *handle, int option) |
| 281 | { |
| 282 | /* Rlogin rlogin = (Rlogin) handle; */ |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | static void rlogin_provide_ldisc(void *handle, void *ldisc) |
| 287 | { |
| 288 | /* This is a stub. */ |
| 289 | } |
| 290 | |
| 291 | static void rlogin_provide_logctx(void *handle, void *logctx) |
| 292 | { |
| 293 | /* This is a stub. */ |
| 294 | } |
| 295 | |
| 296 | static int rlogin_exitcode(void *handle) |
| 297 | { |
| 298 | Rlogin rlogin = (Rlogin) handle; |
| 299 | if (rlogin->s != NULL) |
| 300 | return -1; /* still connected */ |
| 301 | else |
| 302 | /* If we ever implement RSH, we'll probably need to do this properly */ |
| 303 | return 0; |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * cfg_info for rlogin does nothing at all. |
| 308 | */ |
| 309 | static int rlogin_cfg_info(void *handle) |
| 310 | { |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | Backend rlogin_backend = { |
| 315 | rlogin_init, |
| 316 | rlogin_free, |
| 317 | rlogin_reconfig, |
| 318 | rlogin_send, |
| 319 | rlogin_sendbuffer, |
| 320 | rlogin_size, |
| 321 | rlogin_special, |
| 322 | rlogin_get_specials, |
| 323 | rlogin_socket, |
| 324 | rlogin_exitcode, |
| 325 | rlogin_sendok, |
| 326 | rlogin_ldisc, |
| 327 | rlogin_provide_ldisc, |
| 328 | rlogin_provide_logctx, |
| 329 | rlogin_unthrottle, |
| 330 | rlogin_cfg_info, |
| 331 | 1 |
| 332 | }; |