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 | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 266 | /* subnegotiation -- buffer bytes until end request */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 267 | case LIBTELNET_STATE_SB: |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 268 | /* IAC command in subnegotiation -- either IAC SE or IAC IAC */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 269 | if (byte == LIBTELNET_IAC) { |
| 270 | telnet->state = LIBTELNET_STATE_SB_IAC; |
| 271 | /* buffer the byte, or bail if we can't */ |
Sean Middleditch | 7e517ec | 2009-03-14 00:18:30 -0400 | [diff] [blame] | 272 | } else if (_buffer_byte(telnet, byte, user_data) != |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 273 | LIBTELNET_EOK) { |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 274 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 275 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 276 | } |
| 277 | break; |
| 278 | |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 279 | /* IAC escaping inside a subnegotiation */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 280 | case LIBTELNET_STATE_SB_IAC: |
| 281 | switch (byte) { |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 282 | /* end subnegotiation */ |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 283 | case LIBTELNET_SE: |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 284 | /* return to default state */ |
| 285 | start = i + 1; |
| 286 | telnet->state = LIBTELNET_STATE_DATA; |
| 287 | |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 288 | /* zero-size buffer is a protocol error */ |
| 289 | if (telnet->length == 0) { |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 290 | ERROR(telnet, LIBTELNET_EPROTOCOL, user_data, |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 291 | "subnegotiation has zero data"); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 292 | break; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 293 | } |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 294 | |
| 295 | /* invoke callback */ |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 296 | _event(telnet, LIBTELNET_EV_SUBNEGOTIATION, 0, |
| 297 | telnet->buffer[0], telnet->buffer + 1, |
| 298 | telnet->length - 1, user_data); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 299 | telnet->length = 0; |
| 300 | |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 301 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 302 | /* if we are a client or a proxy and just received the |
| 303 | * COMPRESS2 begin marker, setup our zlib box and start |
| 304 | * handling the compressed stream if it's not already. |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 305 | */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 306 | if (telnet->buffer[0] == LIBTELNET_TELOPT_COMPRESS2 && |
| 307 | telnet->z_inflate == 0 && |
| 308 | (telnet->mode == LIBTELNET_MODE_CLIENT || |
| 309 | telnet->mode == LIBTELNET_MODE_PROXY)) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 310 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 311 | if ((telnet->z_inflate = _init_zlib(telnet, 0, user_data)) |
| 312 | == 0) |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 313 | break; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 314 | |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 315 | /* notify app that compression was enabled */ |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 316 | _event(telnet, LIBTELNET_EV_COMPRESS, 1, 0, 0, 0, |
| 317 | user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 318 | |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 319 | /* any remaining bytes in the buffer are compressed. |
| 320 | * we have to re-invoke libtelnet_push to get those |
| 321 | * bytes inflated and abort trying to process the |
| 322 | * remaining compressed bytes in the current _process |
| 323 | * buffer argument |
| 324 | */ |
Sean Middleditch | 2d432c5 | 2009-03-14 11:32:58 -0400 | [diff] [blame] | 325 | libtelnet_push(telnet, &buffer[start], size - start, |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 326 | user_data); |
| 327 | return; |
| 328 | } |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 329 | #endif /* HAVE_ZLIB */ |
| 330 | |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 331 | break; |
| 332 | /* escaped IAC byte */ |
| 333 | case LIBTELNET_IAC: |
| 334 | /* push IAC into buffer */ |
| 335 | if (_buffer_byte(telnet, LIBTELNET_IAC, user_data) != |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 336 | LIBTELNET_EOK) { |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 337 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 338 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 339 | } else { |
| 340 | telnet->state = LIBTELNET_STATE_SB; |
| 341 | } |
| 342 | break; |
| 343 | /* something else -- protocol error */ |
| 344 | default: |
Sean Middleditch | f66a7ee | 2009-03-15 11:54:07 -0400 | [diff] [blame] | 345 | _error(telnet, __FILE__, __LINE__, LIBTELNET_EPROTOCOL, |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 346 | user_data, "unexpected byte after IAC inside SB: %d", |
| 347 | byte); |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 348 | start = i + 1; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 349 | telnet->state = LIBTELNET_STATE_DATA; |
Sean Middleditch | 8b5e2b1 | 2009-03-13 23:39:18 -0400 | [diff] [blame] | 350 | break; |
| 351 | } |
| 352 | break; |
| 353 | } |
| 354 | } |
| 355 | |
| 356 | /* pass through any remaining bytes */ |
Sean Middleditch | d30fd57 | 2009-03-14 12:55:17 -0400 | [diff] [blame] | 357 | if (telnet->state == LIBTELNET_STATE_DATA && i != start) |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 358 | _event(telnet, LIBTELNET_EV_DATA, 0, 0, buffer + start, i - start, |
| 359 | user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 360 | } |
| 361 | |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 362 | /* push a bytes into the state tracker */ |
| 363 | void libtelnet_push(struct libtelnet_t *telnet, unsigned char *buffer, |
| 364 | unsigned int size, void *user_data) { |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 365 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 366 | /* if we have an inflate (decompression) zlib stream, use it */ |
| 367 | if (telnet->z_inflate != 0) { |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 368 | unsigned char inflate_buffer[4096]; |
| 369 | int rs; |
| 370 | |
| 371 | /* initialize zlib state */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 372 | telnet->z_inflate->next_in = buffer; |
| 373 | telnet->z_inflate->avail_in = size; |
| 374 | telnet->z_inflate->next_out = inflate_buffer; |
| 375 | telnet->z_inflate->avail_out = sizeof(inflate_buffer); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 376 | |
| 377 | /* inflate until buffer exhausted and all output is produced */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 378 | 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] | 379 | /* reset output buffer */ |
| 380 | |
| 381 | /* decompress */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 382 | rs = inflate(telnet->z_inflate, Z_SYNC_FLUSH); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 383 | |
| 384 | /* process the decompressed bytes on success */ |
| 385 | if (rs == Z_OK || rs == Z_STREAM_END) |
| 386 | _process(telnet, inflate_buffer, sizeof(inflate_buffer) - |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 387 | telnet->z_inflate->avail_out, user_data); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 388 | else |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 389 | ERROR_ZLIB(telnet, user_data, rs, "inflate() failed"); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 390 | |
| 391 | /* prepare output buffer for next run */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 392 | telnet->z_inflate->next_out = inflate_buffer; |
| 393 | telnet->z_inflate->avail_out = sizeof(inflate_buffer); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 394 | |
| 395 | /* on error (or on end of stream) disable further inflation */ |
| 396 | if (rs != Z_OK) { |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 397 | _event(telnet, LIBTELNET_EV_COMPRESS, 0, 0, 0, 0, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 398 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 399 | inflateEnd(telnet->z_inflate); |
| 400 | free(telnet->z_inflate); |
| 401 | telnet->z_inflate = 0; |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 402 | break; |
| 403 | } |
| 404 | } |
| 405 | |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 406 | /* COMPRESS2 is not negotiated, just process */ |
| 407 | } else |
| 408 | #endif /* HAVE_ZLIB */ |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 409 | _process(telnet, buffer, size, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 410 | } |
| 411 | |
| 412 | static void _send(struct libtelnet_t *telnet, unsigned char *buffer, |
| 413 | unsigned int size, void *user_data) { |
| 414 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 415 | /* if we have a deflate (compression) zlib box, use it */ |
| 416 | if (telnet->z_deflate != 0) { |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 417 | unsigned char deflate_buffer[1024]; |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 418 | int rs; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 419 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 420 | /* initialize z_deflate state */ |
| 421 | telnet->z_deflate->next_in = buffer; |
| 422 | telnet->z_deflate->avail_in = size; |
| 423 | telnet->z_deflate->next_out = deflate_buffer; |
| 424 | telnet->z_deflate->avail_out = sizeof(deflate_buffer); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 425 | |
| 426 | /* deflate until buffer exhausted and all output is produced */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 427 | 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] | 428 | /* compress */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 429 | if ((rs = deflate(telnet->z_deflate, Z_SYNC_FLUSH)) != Z_OK) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 430 | ERROR_ZLIB(telnet, user_data, rs, "deflate() failed"); |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 431 | deflateEnd(telnet->z_deflate); |
| 432 | free(telnet->z_deflate); |
| 433 | telnet->z_deflate = 0; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 434 | break; |
| 435 | } |
| 436 | |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 437 | _event(telnet, LIBTELNET_EV_SEND, 0, 0, deflate_buffer, |
| 438 | sizeof(deflate_buffer) - telnet->z_deflate->avail_out, |
| 439 | user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 440 | |
| 441 | /* prepare output buffer for next run */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 442 | telnet->z_deflate->next_out = deflate_buffer; |
| 443 | telnet->z_deflate->avail_out = sizeof(deflate_buffer); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | /* COMPRESS2 is not negotiated, just send */ |
| 447 | } else |
| 448 | #endif /* HAVE_ZLIB */ |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 449 | _event(telnet, LIBTELNET_EV_SEND, 0, 0, buffer, size, user_data); |
Sean Middleditch | 9de1598 | 2009-03-14 03:35:49 -0400 | [diff] [blame] | 450 | } |
| 451 | |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 452 | /* send an iac command */ |
| 453 | void libtelnet_send_command(struct libtelnet_t *telnet, unsigned char cmd, |
| 454 | void *user_data) { |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 455 | unsigned char bytes[2] = { LIBTELNET_IAC, cmd }; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 456 | _send(telnet, bytes, 2, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | /* send negotiation */ |
| 460 | void libtelnet_send_negotiate(struct libtelnet_t *telnet, unsigned char cmd, |
| 461 | unsigned char opt, void *user_data) { |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 462 | unsigned char bytes[3] = { LIBTELNET_IAC, cmd, opt }; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 463 | _send(telnet, bytes, 3, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | /* send non-command data (escapes IAC bytes) */ |
| 467 | void libtelnet_send_data(struct libtelnet_t *telnet, unsigned char *buffer, |
Sean Middleditch | 4d9444d | 2009-03-13 22:48:05 -0400 | [diff] [blame] | 468 | unsigned int size, void *user_data) { |
| 469 | unsigned int i, l; |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 470 | for (l = i = 0; i != size; ++i) { |
| 471 | /* dump prior portion of text, send escaped bytes */ |
| 472 | if (buffer[i] == LIBTELNET_IAC) { |
| 473 | /* dump prior text if any */ |
| 474 | if (i != l) |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 475 | _send(telnet, buffer + l, i - l, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 476 | l = i + 1; |
| 477 | |
| 478 | /* send escape */ |
| 479 | libtelnet_send_command(telnet, LIBTELNET_IAC, user_data); |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | /* send whatever portion of buffer is left */ |
| 484 | if (i != l) |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 485 | _send(telnet, buffer + l, i - l, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | /* send sub-request */ |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 489 | void libtelnet_send_subnegotiation(struct libtelnet_t *telnet, |
Sean Middleditch | c974b97 | 2009-03-14 13:23:33 -0400 | [diff] [blame] | 490 | unsigned char opt, unsigned char *buffer, unsigned int size, |
Sean Middleditch | 6b37288 | 2009-03-14 13:06:47 -0400 | [diff] [blame] | 491 | void *user_data) { |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 492 | libtelnet_send_command(telnet, LIBTELNET_SB, user_data); |
Sean Middleditch | c974b97 | 2009-03-14 13:23:33 -0400 | [diff] [blame] | 493 | libtelnet_send_data(telnet, &opt, 1, user_data); |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 494 | libtelnet_send_data(telnet, buffer, size, user_data); |
Sean Middleditch | f9cebec | 2009-03-13 20:17:31 -0400 | [diff] [blame] | 495 | libtelnet_send_command(telnet, LIBTELNET_SE, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 496 | |
| 497 | #ifdef HAVE_ZLIB |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 498 | /* if we're a proxy and we just sent the COMPRESS2 marker, we must |
| 499 | * make sure all further data is compressed if not already. |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 500 | */ |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 501 | if (telnet->mode == LIBTELNET_MODE_PROXY && |
| 502 | telnet->z_deflate == 0 && |
| 503 | opt == LIBTELNET_TELOPT_COMPRESS2) { |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 504 | |
Sean Middleditch | 72cc964 | 2009-03-15 11:50:36 -0400 | [diff] [blame] | 505 | if ((telnet->z_deflate = _init_zlib(telnet, 1, user_data)) == 0) |
Sean Middleditch | d922c6f | 2009-03-14 22:35:01 -0400 | [diff] [blame] | 506 | return; |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 507 | |
| 508 | /* notify app that compression was enabled */ |
Sean Middleditch | 637df7f | 2009-03-15 12:57:32 -0400 | [diff] [blame] | 509 | _event(telnet, LIBTELNET_EV_COMPRESS, 1, 0, 0, 0, user_data); |
Sean Middleditch | 61f8eb6 | 2009-03-14 04:57:27 -0400 | [diff] [blame] | 510 | } |
| 511 | #endif /* HAVE_ZLIB */ |
Sean Middleditch | 2914485 | 2009-03-12 23:14:47 -0400 | [diff] [blame] | 512 | } |