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