Sean Middleditch | 6aef073 | 2009-03-12 23:27:35 -0400 | [diff] [blame] | 1 | /* |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 2 | * Sean Middleditch |
| 3 | * sean@sourcemud.org |
| 4 | * |
Sean Middleditch | 6aef073 | 2009-03-12 23:27:35 -0400 | [diff] [blame] | 5 | * The author or authors of this code dedicate any and all copyright interest |
| 6 | * in this code to the public domain. We make this dedication for the benefit |
| 7 | * of the public at large and to the detriment of our heirs and successors. We |
| 8 | * intend this dedication to be an overt act of relinquishment in perpetuity of |
| 9 | * all present and future rights to this code under copyright law. |
| 10 | */ |
| 11 | |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 12 | #include <malloc.h> |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 13 | #include <string.h> |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 14 | #include <stdio.h> |
| 15 | #include <errno.h> |
| 16 | #include <string.h> |
| 17 | #include <stdarg.h> |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 18 | |
| 19 | #ifdef HAVE_ZLIB |
| 20 | #include "zlib.h" |
| 21 | #endif |
| 22 | |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 23 | #include "libtelnet.h" |
| 24 | |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 25 | #ifdef ERROR |
| 26 | # undef ERROR |
| 27 | #endif |
| 28 | |
| 29 | #define ERROR(telnet, code, user_data, msg) \ |
| 30 | _error(telnet, __FILE__, __LINE__, code, user_data, "%s", msg) |
| 31 | #define ERROR_NOMEM(telnet, user_data, msg) \ |
| 32 | _error(telnet, __FILE__, __LINE__, LIBTELNET_ERROR_NOMEM, user_data, \ |
| 33 | "%s: %s", msg, strerror(errno)) |
| 34 | #define ERROR_ZLIB(telnet, user_data, rs, msg) \ |
| 35 | _error(telnet, __FILE__, __LINE__, LIBTELNET_ERROR_UNKNOWN, \ |
| 36 | user_data, "%s: %s", msg, zError(rs)) |
| 37 | |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 38 | /* buffer sizes */ |
| 39 | static const unsigned int _buffer_sizes[] = { |
| 40 | 0, |
| 41 | 512, |
| 42 | 2048, |
| 43 | 8192, |
| 44 | 16384, |
| 45 | }; |
| 46 | static const unsigned int _buffer_sizes_count = |
| 47 | sizeof(_buffer_sizes) / sizeof(_buffer_sizes[0]); |
| 48 | |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 49 | /* error generation function */ |
| 50 | static void _error(struct libtelnet_t *telnet, const char *file, unsigned line, |
| 51 | enum libtelnet_error_t err, void *user_data, const char *fmt, ...) { |
| 52 | char buffer[512]; |
| 53 | va_list va; |
| 54 | |
| 55 | /* format error intro */ |
| 56 | snprintf(buffer, sizeof(buffer), "%s:%u: ", |
| 57 | file, line); |
| 58 | |
| 59 | va_start(va, fmt); |
| 60 | vsnprintf(buffer + strlen(buffer), sizeof(buffer) - strlen(buffer), |
| 61 | fmt, va); |
| 62 | va_end(va); |
| 63 | |
| 64 | /* invoke user's custom error handler if possible; otherwise, |
| 65 | * print to stderr |
| 66 | */ |
| 67 | if (telnet->cb->error) |
| 68 | telnet->cb->error(telnet, err, buffer, user_data); |
| 69 | else |
| 70 | fprintf(stderr, "**ERROR**: libtelnet: %s\n", buffer); |
| 71 | } |
| 72 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 73 | /* initialize the zlib box for a telnet box; if deflate is non-zero, it |
| 74 | * initializes zlib for delating (compression), otherwise for inflating |
| 75 | * (decompression) |
| 76 | */ |
| 77 | z_stream *_init_zlib(struct libtelnet_t *telnet, int deflate, |
| 78 | void *user_data) { |
| 79 | z_stream *zlib; |
| 80 | int rs; |
| 81 | |
| 82 | /* allocate zstream box */ |
| 83 | if ((zlib = (z_stream *)calloc(1, sizeof(z_stream))) |
| 84 | == 0) { |
| 85 | ERROR_NOMEM(telnet, user_data, "malloc() failed"); |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | /* initialize */ |
| 90 | if (deflate) { |
| 91 | if ((rs = deflateInit(zlib, Z_DEFAULT_COMPRESSION)) != Z_OK) { |
| 92 | free(zlib); |
| 93 | ERROR_ZLIB(telnet, user_data, rs, "deflateInit() failed"); |
| 94 | return 0; |
| 95 | } |
| 96 | } else { |
| 97 | if ((rs = inflateInit(zlib)) != Z_OK) { |
| 98 | free(zlib); |
| 99 | ERROR_ZLIB(telnet, user_data, rs, "inflateInit() failed"); |
| 100 | return 0; |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | return zlib; |
| 105 | } |
| 106 | |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 107 | /* initialize a telnet state tracker */ |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 108 | void libtelnet_init(struct libtelnet_t *telnet, struct libtelnet_cb_t *cb, |
| 109 | enum libtelnet_mode_t mode) { |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 110 | memset(telnet, 0, sizeof(struct libtelnet_t)); |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 111 | telnet->cb = cb; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 112 | telnet->mode = mode; |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 113 | } |
| 114 | |
| 115 | /* free up any memory allocated by a state tracker */ |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 116 | void libtelnet_free(struct libtelnet_t *telnet) { |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 117 | /* free sub-request buffer */ |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 118 | if (telnet->buffer != 0) { |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 119 | free(telnet->buffer); |
| 120 | telnet->buffer = 0; |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 121 | telnet->size = 0; |
| 122 | telnet->length = 0; |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 123 | } |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 124 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 125 | /* free zlib box(es) */ |
| 126 | if (telnet->z_inflate != 0) { |
| 127 | inflateEnd(telnet->z_inflate); |
| 128 | free(telnet->z_inflate); |
| 129 | telnet->z_inflate = 0; |
| 130 | } |
| 131 | if (telnet->z_deflate != 0) { |
| 132 | deflateEnd(telnet->z_deflate); |
| 133 | free(telnet->z_deflate); |
| 134 | telnet->z_deflate = 0; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 135 | } |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 136 | } |
| 137 | |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 138 | /* push a byte into the telnet buffer */ |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 139 | static enum libtelnet_error_t _buffer_byte(struct libtelnet_t *telnet, |
| 140 | unsigned char byte, void *user_data) { |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 141 | unsigned char *new_buffer; |
| 142 | int i; |
| 143 | |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 144 | /* check if we're out of room */ |
| 145 | if (telnet->length == telnet->size) { |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 146 | /* find the next buffer size */ |
| 147 | for (i = 0; i != _buffer_sizes_count; ++i) { |
| 148 | if (_buffer_sizes[i] == telnet->size) |
| 149 | break; |
| 150 | } |
| 151 | |
| 152 | /* overflow -- can't grow any more */ |
| 153 | if (i >= _buffer_sizes_count - 1) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 154 | _error(telnet, __FILE__, __LINE__, LIBTELNET_ERROR_OVERFLOW, |
| 155 | user_data, "subnegotiation buffer size limit reached"); |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 156 | libtelnet_free(telnet); |
| 157 | return LIBTELNET_ERROR_OVERFLOW; |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 158 | } |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 159 | |
| 160 | /* (re)allocate buffer */ |
| 161 | new_buffer = (unsigned char *)realloc(telnet->buffer, |
| 162 | _buffer_sizes[i + 1]); |
| 163 | if (new_buffer == 0) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 164 | ERROR_NOMEM(telnet, user_data, "realloc() failed"); |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 165 | libtelnet_free(telnet); |
| 166 | return LIBTELNET_ERROR_NOMEM; |
| 167 | } |
| 168 | |
| 169 | telnet->buffer = new_buffer; |
| 170 | telnet->size = _buffer_sizes[i + 1]; |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | /* push the byte, all set */ |
| 174 | telnet->buffer[telnet->length++] = byte; |
| 175 | return LIBTELNET_ERROR_OK; |
| 176 | } |
| 177 | |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 178 | static void _process(struct libtelnet_t *telnet, unsigned char *buffer, |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 179 | unsigned int size, void *user_data) { |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 180 | unsigned char byte; |
| 181 | unsigned int i, start; |
| 182 | for (i = start = 0; i != size; ++i) { |
| 183 | byte = buffer[i]; |
| 184 | switch (telnet->state) { |
| 185 | /* regular data */ |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 186 | case LIBTELNET_STATE_DATA: |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 187 | /* on an IAC byte, pass through all pending bytes and |
| 188 | * switch states */ |
| 189 | if (byte == LIBTELNET_IAC) { |
| 190 | if (i != start) |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 191 | telnet->cb->data(telnet, &buffer[start], i - start, |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 192 | user_data); |
| 193 | telnet->state = LIBTELNET_STATE_IAC; |
| 194 | } |
| 195 | break; |
| 196 | |
| 197 | /* IAC command */ |
| 198 | case LIBTELNET_STATE_IAC: |
| 199 | switch (byte) { |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 200 | /* subnegotiation */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 201 | case LIBTELNET_SB: |
| 202 | telnet->state = LIBTELNET_STATE_SB; |
| 203 | break; |
| 204 | /* negotiation commands */ |
| 205 | case LIBTELNET_WILL: |
| 206 | telnet->state = LIBTELNET_STATE_WILL; |
| 207 | break; |
| 208 | case LIBTELNET_WONT: |
| 209 | telnet->state = LIBTELNET_STATE_WONT; |
| 210 | break; |
| 211 | case LIBTELNET_DO: |
| 212 | telnet->state = LIBTELNET_STATE_DO; |
| 213 | break; |
| 214 | case LIBTELNET_DONT: |
| 215 | telnet->state = LIBTELNET_STATE_DONT; |
| 216 | break; |
| 217 | /* IAC escaping */ |
| 218 | case LIBTELNET_IAC: |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 219 | telnet->cb->data(telnet, &byte, 1, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 220 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 221 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 222 | break; |
| 223 | /* some other command */ |
| 224 | default: |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 225 | telnet->cb->command(telnet, byte, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 226 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 227 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 228 | } |
| 229 | break; |
| 230 | |
| 231 | /* negotiation commands */ |
| 232 | case LIBTELNET_STATE_DO: |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 233 | telnet->cb->negotiate(telnet, LIBTELNET_DO, byte, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 234 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 235 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 236 | break; |
| 237 | case LIBTELNET_STATE_DONT: |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 238 | telnet->cb->negotiate(telnet, LIBTELNET_DONT, byte, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 239 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 240 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 241 | break; |
| 242 | case LIBTELNET_STATE_WILL: |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 243 | telnet->cb->negotiate(telnet, LIBTELNET_WILL, byte, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 244 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 245 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 246 | break; |
| 247 | case LIBTELNET_STATE_WONT: |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 248 | telnet->cb->negotiate(telnet, LIBTELNET_WONT, byte, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 249 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 250 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 251 | break; |
| 252 | |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 253 | /* subnegotiation -- buffer bytes until end request */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 254 | case LIBTELNET_STATE_SB: |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 255 | /* IAC command in subnegotiation -- either IAC SE or IAC IAC */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 256 | if (byte == LIBTELNET_IAC) { |
| 257 | telnet->state = LIBTELNET_STATE_SB_IAC; |
| 258 | /* buffer the byte, or bail if we can't */ |
Sean Middleditch | 7e517ec | 2009-03-14 00:18:30 -0400 | [diff] [blame] | 259 | } else if (_buffer_byte(telnet, byte, user_data) != |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 260 | LIBTELNET_ERROR_OK) { |
| 261 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 262 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 263 | } |
| 264 | break; |
| 265 | |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 266 | /* IAC escaping inside a subnegotiation */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 267 | case LIBTELNET_STATE_SB_IAC: |
| 268 | switch (byte) { |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 269 | /* end subnegotiation */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 270 | case LIBTELNET_SE: |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 271 | /* return to default state */ |
| 272 | start = i + 1; |
| 273 | telnet->state = LIBTELNET_STATE_DATA; |
| 274 | |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 275 | /* zero-size buffer is a protocol error */ |
| 276 | if (telnet->length == 0) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 277 | ERROR(telnet, LIBTELNET_ERROR_PROTOCOL, user_data, |
| 278 | "subnegotiation has zero data"); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 279 | break; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 280 | } |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 281 | |
| 282 | /* invoke callback */ |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 283 | telnet->cb->subnegotiation(telnet, telnet->buffer[0], |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 284 | telnet->buffer + 1, telnet->length - 1, user_data); |
| 285 | telnet->length = 0; |
| 286 | |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 287 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 288 | /* if we are a client or a proxy and just received the |
| 289 | * COMPRESS2 begin marker, setup our zlib box and start |
| 290 | * handling the compressed stream if it's not already. |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 291 | */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 292 | if (telnet->buffer[0] == LIBTELNET_TELOPT_COMPRESS2 && |
| 293 | telnet->z_inflate == 0 && |
| 294 | (telnet->mode == LIBTELNET_MODE_CLIENT || |
| 295 | telnet->mode == LIBTELNET_MODE_PROXY)) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 296 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 297 | if ((telnet->z_inflate = _init_zlib(telnet, 0, user_data)) |
| 298 | == 0) |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 299 | break; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 300 | |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 301 | /* notify app that compression was enabled */ |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 302 | telnet->cb->compress(telnet, 1, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 303 | |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 304 | /* any remaining bytes in the buffer are compressed. |
| 305 | * we have to re-invoke libtelnet_push to get those |
| 306 | * bytes inflated and abort trying to process the |
| 307 | * remaining compressed bytes in the current _process |
| 308 | * buffer argument |
| 309 | */ |
Sean Middleditch | 2d432c5 | 2009-03-14 11:32:58 -0400 | [diff] [blame] | 310 | libtelnet_push(telnet, &buffer[start], size - start, |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 311 | user_data); |
| 312 | return; |
| 313 | } |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 314 | #endif /* HAVE_ZLIB */ |
| 315 | |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 316 | break; |
| 317 | /* escaped IAC byte */ |
| 318 | case LIBTELNET_IAC: |
| 319 | /* push IAC into buffer */ |
| 320 | if (_buffer_byte(telnet, LIBTELNET_IAC, user_data) != |
| 321 | LIBTELNET_ERROR_OK) { |
| 322 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 323 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 324 | } else { |
| 325 | telnet->state = LIBTELNET_STATE_SB; |
| 326 | } |
| 327 | break; |
| 328 | /* something else -- protocol error */ |
| 329 | default: |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 330 | _error(telnet, __FILE__, __LINE__, LIBTELNET_ERROR_PROTOCOL, |
| 331 | user_data, "unexpected byte after IAC inside SB: %d", |
| 332 | byte); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 333 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 334 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 335 | break; |
| 336 | } |
| 337 | break; |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | /* pass through any remaining bytes */ |
Sean Middleditch | d30fd57 | 2009-03-14 12:55:17 -0400 | [diff] [blame] | 342 | if (telnet->state == LIBTELNET_STATE_DATA && i != start) |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 343 | telnet->cb->data(telnet, &buffer[start], i - start, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 344 | } |
| 345 | |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 346 | /* push a bytes into the state tracker */ |
| 347 | void libtelnet_push(struct libtelnet_t *telnet, unsigned char *buffer, |
| 348 | unsigned int size, void *user_data) { |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 349 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 350 | /* if we have an inflate (decompression) zlib stream, use it */ |
| 351 | if (telnet->z_inflate != 0) { |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 352 | unsigned char inflate_buffer[4096]; |
| 353 | int rs; |
| 354 | |
| 355 | /* initialize zlib state */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 356 | telnet->z_inflate->next_in = buffer; |
| 357 | telnet->z_inflate->avail_in = size; |
| 358 | telnet->z_inflate->next_out = inflate_buffer; |
| 359 | telnet->z_inflate->avail_out = sizeof(inflate_buffer); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 360 | |
| 361 | /* inflate until buffer exhausted and all output is produced */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 362 | while (telnet->z_inflate->avail_in > 0 || telnet->z_inflate->avail_out == 0) { |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 363 | /* reset output buffer */ |
| 364 | |
| 365 | /* decompress */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 366 | rs = inflate(telnet->z_inflate, Z_SYNC_FLUSH); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 367 | |
| 368 | /* process the decompressed bytes on success */ |
| 369 | if (rs == Z_OK || rs == Z_STREAM_END) |
| 370 | _process(telnet, inflate_buffer, sizeof(inflate_buffer) - |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 371 | telnet->z_inflate->avail_out, user_data); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 372 | else |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 373 | ERROR_ZLIB(telnet, user_data, rs, "inflate() failed"); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 374 | |
| 375 | /* prepare output buffer for next run */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 376 | telnet->z_inflate->next_out = inflate_buffer; |
| 377 | telnet->z_inflate->avail_out = sizeof(inflate_buffer); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 378 | |
| 379 | /* on error (or on end of stream) disable further inflation */ |
| 380 | if (rs != Z_OK) { |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 381 | telnet->cb->compress(telnet, 0, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 382 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 383 | inflateEnd(telnet->z_inflate); |
| 384 | free(telnet->z_inflate); |
| 385 | telnet->z_inflate = 0; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 386 | break; |
| 387 | } |
| 388 | } |
| 389 | |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 390 | /* COMPRESS2 is not negotiated, just process */ |
| 391 | } else |
| 392 | #endif /* HAVE_ZLIB */ |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 393 | _process(telnet, buffer, size, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 394 | } |
| 395 | |
| 396 | static void _send(struct libtelnet_t *telnet, unsigned char *buffer, |
| 397 | unsigned int size, void *user_data) { |
| 398 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 399 | /* if we have a deflate (compression) zlib box, use it */ |
| 400 | if (telnet->z_deflate != 0) { |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 401 | unsigned char deflate_buffer[1024]; |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 402 | int rs; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 403 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 404 | /* initialize z_deflate state */ |
| 405 | telnet->z_deflate->next_in = buffer; |
| 406 | telnet->z_deflate->avail_in = size; |
| 407 | telnet->z_deflate->next_out = deflate_buffer; |
| 408 | telnet->z_deflate->avail_out = sizeof(deflate_buffer); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 409 | |
| 410 | /* deflate until buffer exhausted and all output is produced */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 411 | while (telnet->z_deflate->avail_in > 0 || telnet->z_deflate->avail_out == 0) { |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 412 | /* compress */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 413 | if ((rs = deflate(telnet->z_deflate, Z_SYNC_FLUSH)) != Z_OK) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 414 | ERROR_ZLIB(telnet, user_data, rs, "deflate() failed"); |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 415 | deflateEnd(telnet->z_deflate); |
| 416 | free(telnet->z_deflate); |
| 417 | telnet->z_deflate = 0; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 418 | break; |
| 419 | } |
| 420 | |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 421 | telnet->cb->send(telnet, deflate_buffer, sizeof(deflate_buffer) - |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 422 | telnet->z_deflate->avail_out, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 423 | |
| 424 | /* prepare output buffer for next run */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 425 | telnet->z_deflate->next_out = deflate_buffer; |
| 426 | telnet->z_deflate->avail_out = sizeof(deflate_buffer); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 427 | } |
| 428 | |
| 429 | /* COMPRESS2 is not negotiated, just send */ |
| 430 | } else |
| 431 | #endif /* HAVE_ZLIB */ |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 432 | telnet->cb->send(telnet, buffer, size, user_data); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 433 | } |
| 434 | |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 435 | /* send an iac command */ |
| 436 | void libtelnet_send_command(struct libtelnet_t *telnet, unsigned char cmd, |
| 437 | void *user_data) { |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 438 | unsigned char bytes[2] = { LIBTELNET_IAC, cmd }; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 439 | _send(telnet, bytes, 2, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 440 | } |
| 441 | |
| 442 | /* send negotiation */ |
| 443 | void libtelnet_send_negotiate(struct libtelnet_t *telnet, unsigned char cmd, |
| 444 | unsigned char opt, void *user_data) { |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 445 | unsigned char bytes[3] = { LIBTELNET_IAC, cmd, opt }; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 446 | _send(telnet, bytes, 3, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 447 | } |
| 448 | |
| 449 | /* send non-command data (escapes IAC bytes) */ |
| 450 | void libtelnet_send_data(struct libtelnet_t *telnet, unsigned char *buffer, |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 451 | unsigned int size, void *user_data) { |
| 452 | unsigned int i, l; |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 453 | for (l = i = 0; i != size; ++i) { |
| 454 | /* dump prior portion of text, send escaped bytes */ |
| 455 | if (buffer[i] == LIBTELNET_IAC) { |
| 456 | /* dump prior text if any */ |
| 457 | if (i != l) |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 458 | _send(telnet, buffer + l, i - l, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 459 | l = i + 1; |
| 460 | |
| 461 | /* send escape */ |
| 462 | libtelnet_send_command(telnet, LIBTELNET_IAC, user_data); |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | /* send whatever portion of buffer is left */ |
| 467 | if (i != l) |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 468 | _send(telnet, buffer + l, i - l, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | /* send sub-request */ |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 472 | void libtelnet_send_subnegotiation(struct libtelnet_t *telnet, |
Sean Middleditch | c974b97 | 2009-03-14 13:23:33 -0400 | [diff] [blame] | 473 | unsigned char opt, unsigned char *buffer, unsigned int size, |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 474 | void *user_data) { |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 475 | libtelnet_send_command(telnet, LIBTELNET_SB, user_data); |
Sean Middleditch | c974b97 | 2009-03-14 13:23:33 -0400 | [diff] [blame] | 476 | libtelnet_send_data(telnet, &opt, 1, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 477 | libtelnet_send_data(telnet, buffer, size, user_data); |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 478 | libtelnet_send_command(telnet, LIBTELNET_SE, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 479 | |
| 480 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 481 | /* if we're a proxy and we just sent the COMPRESS2 marker, we must |
| 482 | * make sure all further data is compressed if not already. |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 483 | */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 484 | if (telnet->mode == LIBTELNET_MODE_PROXY && |
| 485 | telnet->z_deflate == 0 && |
| 486 | opt == LIBTELNET_TELOPT_COMPRESS2) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 487 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame^] | 488 | if ((telnet->z_deflate = _init_zlib(telnet, 1, user_data)) == 0) |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 489 | return; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 490 | |
| 491 | /* notify app that compression was enabled */ |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 492 | telnet->cb->compress(telnet, 1, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 493 | } |
| 494 | #endif /* HAVE_ZLIB */ |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 495 | } |