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 | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 25 | /* error handler helpers */ |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 26 | #ifdef ERROR |
| 27 | # undef ERROR |
| 28 | #endif |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 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) \ |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 32 | _error(telnet, __FILE__, __LINE__, LIBTELNET_ENOMEM, user_data, \ |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 33 | "%s: %s", msg, strerror(errno)) |
| 34 | #define ERROR_ZLIB(telnet, user_data, rs, msg) \ |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 35 | _error(telnet, __FILE__, __LINE__, LIBTELNET_EUNKNOWN, \ |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 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 | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 49 | /* event dispatch helper */ |
| 50 | static void _event(struct libtelnet_t *telnet, |
| 51 | enum libtelnet_event_type_t type, unsigned char command, |
| 52 | unsigned char telopt, unsigned char *buffer, unsigned int size, |
| 53 | void *user_data) { |
| 54 | struct libtelnet_event_t ev; |
| 55 | ev.type = type; |
| 56 | ev.command = command; |
| 57 | ev.telopt = telopt; |
| 58 | ev.buffer = buffer; |
| 59 | ev.size = size; |
| 60 | |
| 61 | telnet->eh(telnet, &ev, user_data); |
| 62 | } |
| 63 | |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 64 | /* error generation function */ |
| 65 | static void _error(struct libtelnet_t *telnet, const char *file, unsigned line, |
| 66 | enum libtelnet_error_t err, void *user_data, const char *fmt, ...) { |
| 67 | char buffer[512]; |
| 68 | va_list va; |
| 69 | |
| 70 | /* format error intro */ |
| 71 | snprintf(buffer, sizeof(buffer), "%s:%u: ", |
| 72 | file, line); |
| 73 | |
| 74 | va_start(va, fmt); |
| 75 | vsnprintf(buffer + strlen(buffer), sizeof(buffer) - strlen(buffer), |
| 76 | fmt, va); |
| 77 | va_end(va); |
| 78 | |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 79 | _event(telnet, LIBTELNET_EV_ERROR, err, 0, 0, 0, user_data); |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 80 | } |
| 81 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 82 | /* initialize the zlib box for a telnet box; if deflate is non-zero, it |
| 83 | * initializes zlib for delating (compression), otherwise for inflating |
| 84 | * (decompression) |
| 85 | */ |
| 86 | z_stream *_init_zlib(struct libtelnet_t *telnet, int deflate, |
| 87 | void *user_data) { |
| 88 | z_stream *zlib; |
| 89 | int rs; |
| 90 | |
| 91 | /* allocate zstream box */ |
| 92 | if ((zlib = (z_stream *)calloc(1, sizeof(z_stream))) |
| 93 | == 0) { |
| 94 | ERROR_NOMEM(telnet, user_data, "malloc() failed"); |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | /* initialize */ |
| 99 | if (deflate) { |
| 100 | if ((rs = deflateInit(zlib, Z_DEFAULT_COMPRESSION)) != Z_OK) { |
| 101 | free(zlib); |
| 102 | ERROR_ZLIB(telnet, user_data, rs, "deflateInit() failed"); |
| 103 | return 0; |
| 104 | } |
| 105 | } else { |
| 106 | if ((rs = inflateInit(zlib)) != Z_OK) { |
| 107 | free(zlib); |
| 108 | ERROR_ZLIB(telnet, user_data, rs, "inflateInit() failed"); |
| 109 | return 0; |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | return zlib; |
| 114 | } |
| 115 | |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 116 | /* initialize a telnet state tracker */ |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 117 | void libtelnet_init(struct libtelnet_t *telnet, libtelnet_event_handler_t eh, |
Sean Middleditch | 3032302 | 2009-03-14 21:45:28 -0400 | [diff] [blame] | 118 | enum libtelnet_mode_t mode) { |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 119 | memset(telnet, 0, sizeof(struct libtelnet_t)); |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 120 | telnet->eh = eh; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 121 | telnet->mode = mode; |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | /* free up any memory allocated by a state tracker */ |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 125 | void libtelnet_free(struct libtelnet_t *telnet) { |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 126 | /* free sub-request buffer */ |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 127 | if (telnet->buffer != 0) { |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 128 | free(telnet->buffer); |
| 129 | telnet->buffer = 0; |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 130 | telnet->size = 0; |
| 131 | telnet->length = 0; |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 132 | } |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 133 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 134 | /* free zlib box(es) */ |
| 135 | if (telnet->z_inflate != 0) { |
| 136 | inflateEnd(telnet->z_inflate); |
| 137 | free(telnet->z_inflate); |
| 138 | telnet->z_inflate = 0; |
| 139 | } |
| 140 | if (telnet->z_deflate != 0) { |
| 141 | deflateEnd(telnet->z_deflate); |
| 142 | free(telnet->z_deflate); |
| 143 | telnet->z_deflate = 0; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 144 | } |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 145 | } |
| 146 | |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 147 | /* push a byte into the telnet buffer */ |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 148 | static enum libtelnet_error_t _buffer_byte(struct libtelnet_t *telnet, |
| 149 | unsigned char byte, void *user_data) { |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 150 | unsigned char *new_buffer; |
| 151 | int i; |
| 152 | |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 153 | /* check if we're out of room */ |
| 154 | if (telnet->length == telnet->size) { |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 155 | /* find the next buffer size */ |
| 156 | for (i = 0; i != _buffer_sizes_count; ++i) { |
| 157 | if (_buffer_sizes[i] == telnet->size) |
| 158 | break; |
| 159 | } |
| 160 | |
| 161 | /* overflow -- can't grow any more */ |
| 162 | if (i >= _buffer_sizes_count - 1) { |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 163 | _error(telnet, __FILE__, __LINE__, LIBTELNET_EOVERFLOW, |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 164 | user_data, "subnegotiation buffer size limit reached"); |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 165 | libtelnet_free(telnet); |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 166 | return LIBTELNET_EOVERFLOW; |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 167 | } |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 168 | |
| 169 | /* (re)allocate buffer */ |
| 170 | new_buffer = (unsigned char *)realloc(telnet->buffer, |
| 171 | _buffer_sizes[i + 1]); |
| 172 | if (new_buffer == 0) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 173 | ERROR_NOMEM(telnet, user_data, "realloc() failed"); |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 174 | libtelnet_free(telnet); |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 175 | return LIBTELNET_ENOMEM; |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | telnet->buffer = new_buffer; |
| 179 | telnet->size = _buffer_sizes[i + 1]; |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | /* push the byte, all set */ |
| 183 | telnet->buffer[telnet->length++] = byte; |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 184 | return LIBTELNET_EOK; |
Sean Middleditch | 51ad679 | 2009-03-13 20:15:59 -0400 | [diff] [blame] | 185 | } |
| 186 | |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 187 | static void _process(struct libtelnet_t *telnet, unsigned char *buffer, |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 188 | unsigned int size, void *user_data) { |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 189 | unsigned char byte; |
| 190 | unsigned int i, start; |
| 191 | for (i = start = 0; i != size; ++i) { |
| 192 | byte = buffer[i]; |
| 193 | switch (telnet->state) { |
| 194 | /* regular data */ |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 195 | case LIBTELNET_STATE_DATA: |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 196 | /* on an IAC byte, pass through all pending bytes and |
| 197 | * switch states */ |
| 198 | if (byte == LIBTELNET_IAC) { |
| 199 | if (i != start) |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 200 | _event(telnet, LIBTELNET_EV_DATA, 0, 0, &buffer[start], |
| 201 | i - start, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 202 | telnet->state = LIBTELNET_STATE_IAC; |
| 203 | } |
| 204 | break; |
| 205 | |
| 206 | /* IAC command */ |
| 207 | case LIBTELNET_STATE_IAC: |
| 208 | switch (byte) { |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 209 | /* subnegotiation */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 210 | case LIBTELNET_SB: |
| 211 | telnet->state = LIBTELNET_STATE_SB; |
| 212 | break; |
| 213 | /* negotiation commands */ |
| 214 | case LIBTELNET_WILL: |
| 215 | telnet->state = LIBTELNET_STATE_WILL; |
| 216 | break; |
| 217 | case LIBTELNET_WONT: |
| 218 | telnet->state = LIBTELNET_STATE_WONT; |
| 219 | break; |
| 220 | case LIBTELNET_DO: |
| 221 | telnet->state = LIBTELNET_STATE_DO; |
| 222 | break; |
| 223 | case LIBTELNET_DONT: |
| 224 | telnet->state = LIBTELNET_STATE_DONT; |
| 225 | break; |
| 226 | /* IAC escaping */ |
| 227 | case LIBTELNET_IAC: |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 228 | _event(telnet, LIBTELNET_EV_DATA, 0, 0, &byte, 1, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 229 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 230 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 231 | break; |
| 232 | /* some other command */ |
| 233 | default: |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 234 | _event(telnet, LIBTELNET_EV_IAC, byte, 0, 0, 0, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 235 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 236 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 237 | } |
| 238 | break; |
| 239 | |
| 240 | /* negotiation commands */ |
| 241 | case LIBTELNET_STATE_DO: |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 242 | _event(telnet, LIBTELNET_EV_NEGOTIATE, LIBTELNET_DO, byte, |
| 243 | 0, 0, 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_DONT: |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 248 | _event(telnet, LIBTELNET_EV_NEGOTIATE, LIBTELNET_DONT, byte, |
| 249 | 0, 0, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 250 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 251 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 252 | break; |
| 253 | case LIBTELNET_STATE_WILL: |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 254 | _event(telnet, LIBTELNET_EV_NEGOTIATE, LIBTELNET_WILL, byte, |
| 255 | 0, 0, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 256 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 257 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 258 | break; |
| 259 | case LIBTELNET_STATE_WONT: |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 260 | _event(telnet, LIBTELNET_EV_NEGOTIATE, LIBTELNET_WONT, byte, |
| 261 | 0, 0, user_data); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 262 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 263 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 264 | break; |
| 265 | |
Sean Middleditch | da0e695 | 2009-03-15 13:28:09 -0400 | [diff] [blame^] | 266 | /* subnegotiation -- determine subnegotiation telopt */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 267 | case LIBTELNET_STATE_SB: |
Sean Middleditch | da0e695 | 2009-03-15 13:28:09 -0400 | [diff] [blame^] | 268 | telnet->sb_telopt = byte; |
| 269 | telnet->length = 0; |
| 270 | telnet->state = LIBTELNET_STATE_SB_DATA; |
| 271 | break; |
| 272 | |
| 273 | /* subnegotiation -- buffer bytes until end request */ |
| 274 | case LIBTELNET_STATE_SB_DATA: |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 275 | /* IAC command in subnegotiation -- either IAC SE or IAC IAC */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 276 | if (byte == LIBTELNET_IAC) { |
Sean Middleditch | da0e695 | 2009-03-15 13:28:09 -0400 | [diff] [blame^] | 277 | telnet->state = LIBTELNET_STATE_SB_DATA_IAC; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 278 | /* buffer the byte, or bail if we can't */ |
Sean Middleditch | 7e517ec | 2009-03-14 00:18:30 -0400 | [diff] [blame] | 279 | } else if (_buffer_byte(telnet, byte, user_data) != |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 280 | LIBTELNET_EOK) { |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 281 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 282 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 283 | } |
| 284 | break; |
| 285 | |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 286 | /* IAC escaping inside a subnegotiation */ |
Sean Middleditch | da0e695 | 2009-03-15 13:28:09 -0400 | [diff] [blame^] | 287 | case LIBTELNET_STATE_SB_DATA_IAC: |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 288 | switch (byte) { |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 289 | /* end subnegotiation */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 290 | case LIBTELNET_SE: |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 291 | /* return to default state */ |
| 292 | start = i + 1; |
| 293 | telnet->state = LIBTELNET_STATE_DATA; |
| 294 | |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 295 | /* invoke callback */ |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 296 | _event(telnet, LIBTELNET_EV_SUBNEGOTIATION, 0, |
Sean Middleditch | da0e695 | 2009-03-15 13:28:09 -0400 | [diff] [blame^] | 297 | telnet->sb_telopt, telnet->buffer, telnet->length, |
| 298 | user_data); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 299 | |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 300 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 301 | /* if we are a client or a proxy and just received the |
| 302 | * COMPRESS2 begin marker, setup our zlib box and start |
| 303 | * handling the compressed stream if it's not already. |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 304 | */ |
Sean Middleditch | da0e695 | 2009-03-15 13:28:09 -0400 | [diff] [blame^] | 305 | if (telnet->sb_telopt == LIBTELNET_TELOPT_COMPRESS2 && |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 306 | telnet->z_inflate == 0 && |
| 307 | (telnet->mode == LIBTELNET_MODE_CLIENT || |
| 308 | telnet->mode == LIBTELNET_MODE_PROXY)) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 309 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 310 | if ((telnet->z_inflate = _init_zlib(telnet, 0, user_data)) |
| 311 | == 0) |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 312 | break; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 313 | |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 314 | /* notify app that compression was enabled */ |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 315 | _event(telnet, LIBTELNET_EV_COMPRESS, 1, 0, 0, 0, |
| 316 | user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 317 | |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 318 | /* any remaining bytes in the buffer are compressed. |
| 319 | * we have to re-invoke libtelnet_push to get those |
| 320 | * bytes inflated and abort trying to process the |
| 321 | * remaining compressed bytes in the current _process |
| 322 | * buffer argument |
| 323 | */ |
Sean Middleditch | 2d432c5 | 2009-03-14 11:32:58 -0400 | [diff] [blame] | 324 | libtelnet_push(telnet, &buffer[start], size - start, |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 325 | user_data); |
| 326 | return; |
| 327 | } |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 328 | #endif /* HAVE_ZLIB */ |
| 329 | |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 330 | break; |
| 331 | /* escaped IAC byte */ |
| 332 | case LIBTELNET_IAC: |
| 333 | /* push IAC into buffer */ |
| 334 | if (_buffer_byte(telnet, LIBTELNET_IAC, user_data) != |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 335 | LIBTELNET_EOK) { |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 336 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 337 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 338 | } else { |
Sean Middleditch | da0e695 | 2009-03-15 13:28:09 -0400 | [diff] [blame^] | 339 | telnet->state = LIBTELNET_STATE_SB_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 340 | } |
| 341 | break; |
| 342 | /* something else -- protocol error */ |
| 343 | default: |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 344 | _error(telnet, __FILE__, __LINE__, LIBTELNET_EPROTOCOL, |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 345 | user_data, "unexpected byte after IAC inside SB: %d", |
| 346 | byte); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 347 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 348 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 349 | break; |
| 350 | } |
| 351 | break; |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | /* pass through any remaining bytes */ |
Sean Middleditch | d30fd57 | 2009-03-14 12:55:17 -0400 | [diff] [blame] | 356 | if (telnet->state == LIBTELNET_STATE_DATA && i != start) |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 357 | _event(telnet, LIBTELNET_EV_DATA, 0, 0, buffer + start, i - start, |
| 358 | user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 359 | } |
| 360 | |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 361 | /* push a bytes into the state tracker */ |
| 362 | void libtelnet_push(struct libtelnet_t *telnet, unsigned char *buffer, |
| 363 | unsigned int size, void *user_data) { |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 364 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 365 | /* if we have an inflate (decompression) zlib stream, use it */ |
| 366 | if (telnet->z_inflate != 0) { |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 367 | unsigned char inflate_buffer[4096]; |
| 368 | int rs; |
| 369 | |
| 370 | /* initialize zlib state */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 371 | telnet->z_inflate->next_in = buffer; |
| 372 | telnet->z_inflate->avail_in = size; |
| 373 | telnet->z_inflate->next_out = inflate_buffer; |
| 374 | telnet->z_inflate->avail_out = sizeof(inflate_buffer); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 375 | |
| 376 | /* inflate until buffer exhausted and all output is produced */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 377 | 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] | 378 | /* reset output buffer */ |
| 379 | |
| 380 | /* decompress */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 381 | rs = inflate(telnet->z_inflate, Z_SYNC_FLUSH); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 382 | |
| 383 | /* process the decompressed bytes on success */ |
| 384 | if (rs == Z_OK || rs == Z_STREAM_END) |
| 385 | _process(telnet, inflate_buffer, sizeof(inflate_buffer) - |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 386 | telnet->z_inflate->avail_out, user_data); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 387 | else |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 388 | ERROR_ZLIB(telnet, user_data, rs, "inflate() failed"); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 389 | |
| 390 | /* prepare output buffer for next run */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 391 | telnet->z_inflate->next_out = inflate_buffer; |
| 392 | telnet->z_inflate->avail_out = sizeof(inflate_buffer); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 393 | |
| 394 | /* on error (or on end of stream) disable further inflation */ |
| 395 | if (rs != Z_OK) { |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 396 | _event(telnet, LIBTELNET_EV_COMPRESS, 0, 0, 0, 0, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 397 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 398 | inflateEnd(telnet->z_inflate); |
| 399 | free(telnet->z_inflate); |
| 400 | telnet->z_inflate = 0; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 401 | break; |
| 402 | } |
| 403 | } |
| 404 | |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 405 | /* COMPRESS2 is not negotiated, just process */ |
| 406 | } else |
| 407 | #endif /* HAVE_ZLIB */ |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 408 | _process(telnet, buffer, size, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 409 | } |
| 410 | |
| 411 | static void _send(struct libtelnet_t *telnet, unsigned char *buffer, |
| 412 | unsigned int size, void *user_data) { |
| 413 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 414 | /* if we have a deflate (compression) zlib box, use it */ |
| 415 | if (telnet->z_deflate != 0) { |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 416 | unsigned char deflate_buffer[1024]; |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 417 | int rs; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 418 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 419 | /* initialize z_deflate state */ |
| 420 | telnet->z_deflate->next_in = buffer; |
| 421 | telnet->z_deflate->avail_in = size; |
| 422 | telnet->z_deflate->next_out = deflate_buffer; |
| 423 | telnet->z_deflate->avail_out = sizeof(deflate_buffer); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 424 | |
| 425 | /* deflate until buffer exhausted and all output is produced */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 426 | 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] | 427 | /* compress */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 428 | if ((rs = deflate(telnet->z_deflate, Z_SYNC_FLUSH)) != Z_OK) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 429 | ERROR_ZLIB(telnet, user_data, rs, "deflate() failed"); |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 430 | deflateEnd(telnet->z_deflate); |
| 431 | free(telnet->z_deflate); |
| 432 | telnet->z_deflate = 0; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 433 | break; |
| 434 | } |
| 435 | |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 436 | _event(telnet, LIBTELNET_EV_SEND, 0, 0, deflate_buffer, |
| 437 | sizeof(deflate_buffer) - telnet->z_deflate->avail_out, |
| 438 | user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 439 | |
| 440 | /* prepare output buffer for next run */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 441 | telnet->z_deflate->next_out = deflate_buffer; |
| 442 | telnet->z_deflate->avail_out = sizeof(deflate_buffer); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | /* COMPRESS2 is not negotiated, just send */ |
| 446 | } else |
| 447 | #endif /* HAVE_ZLIB */ |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 448 | _event(telnet, LIBTELNET_EV_SEND, 0, 0, buffer, size, user_data); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 449 | } |
| 450 | |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 451 | /* send an iac command */ |
| 452 | void libtelnet_send_command(struct libtelnet_t *telnet, unsigned char cmd, |
| 453 | void *user_data) { |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 454 | unsigned char bytes[2] = { LIBTELNET_IAC, cmd }; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 455 | _send(telnet, bytes, 2, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | /* send negotiation */ |
| 459 | void libtelnet_send_negotiate(struct libtelnet_t *telnet, unsigned char cmd, |
| 460 | unsigned char opt, void *user_data) { |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 461 | unsigned char bytes[3] = { LIBTELNET_IAC, cmd, opt }; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 462 | _send(telnet, bytes, 3, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | /* send non-command data (escapes IAC bytes) */ |
| 466 | void libtelnet_send_data(struct libtelnet_t *telnet, unsigned char *buffer, |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 467 | unsigned int size, void *user_data) { |
| 468 | unsigned int i, l; |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 469 | for (l = i = 0; i != size; ++i) { |
| 470 | /* dump prior portion of text, send escaped bytes */ |
| 471 | if (buffer[i] == LIBTELNET_IAC) { |
| 472 | /* dump prior text if any */ |
| 473 | if (i != l) |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 474 | _send(telnet, buffer + l, i - l, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 475 | l = i + 1; |
| 476 | |
| 477 | /* send escape */ |
| 478 | libtelnet_send_command(telnet, LIBTELNET_IAC, user_data); |
| 479 | } |
| 480 | } |
| 481 | |
| 482 | /* send whatever portion of buffer is left */ |
| 483 | if (i != l) |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 484 | _send(telnet, buffer + l, i - l, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 485 | } |
| 486 | |
| 487 | /* send sub-request */ |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 488 | void libtelnet_send_subnegotiation(struct libtelnet_t *telnet, |
Sean Middleditch | c974b97 | 2009-03-14 13:23:33 -0400 | [diff] [blame] | 489 | unsigned char opt, unsigned char *buffer, unsigned int size, |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 490 | void *user_data) { |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 491 | libtelnet_send_command(telnet, LIBTELNET_SB, user_data); |
Sean Middleditch | c974b97 | 2009-03-14 13:23:33 -0400 | [diff] [blame] | 492 | libtelnet_send_data(telnet, &opt, 1, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 493 | libtelnet_send_data(telnet, buffer, size, user_data); |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 494 | libtelnet_send_command(telnet, LIBTELNET_SE, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 495 | |
| 496 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 497 | /* if we're a proxy and we just sent the COMPRESS2 marker, we must |
| 498 | * make sure all further data is compressed if not already. |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 499 | */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 500 | if (telnet->mode == LIBTELNET_MODE_PROXY && |
| 501 | telnet->z_deflate == 0 && |
| 502 | opt == LIBTELNET_TELOPT_COMPRESS2) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 503 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 504 | if ((telnet->z_deflate = _init_zlib(telnet, 1, user_data)) == 0) |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 505 | return; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 506 | |
| 507 | /* notify app that compression was enabled */ |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 508 | _event(telnet, LIBTELNET_EV_COMPRESS, 1, 0, 0, 0, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 509 | } |
| 510 | #endif /* HAVE_ZLIB */ |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 511 | } |
Sean Middleditch | 124a1c2 | 2009-03-15 13:20:03 -0400 | [diff] [blame] | 512 | |
| 513 | void libtelnet_begin_compress2(struct libtelnet_t *telnet, void *user_data) { |
| 514 | #ifdef HAVE_ZLIB |
| 515 | z_stream *zlib; |
| 516 | |
| 517 | /* don't do this if we've already got a compression stream */ |
| 518 | if (telnet->z_deflate != 0) |
| 519 | return; |
| 520 | |
| 521 | /* only supported by servers */ |
| 522 | if (telnet->mode != LIBTELNET_MODE_SERVER) |
| 523 | return; |
| 524 | |
| 525 | /* attempt to create output stream first, bail if we can't */ |
| 526 | if ((zlib = _init_zlib(telnet, 1, user_data)) == 0) |
| 527 | return; |
| 528 | |
| 529 | /* send compression marker */ |
| 530 | libtelnet_send_subnegotiation(telnet, LIBTELNET_TELOPT_COMPRESS2, 0, 0, |
| 531 | user_data); |
| 532 | |
| 533 | /* set our deflate stream */ |
| 534 | telnet->z_deflate = zlib; |
| 535 | #endif /* HAVE_ZLIB */ |
| 536 | } |