David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 1 | #include "private-libwebsockets.h" |
| 2 | #include "extension-deflate-frame.h" |
| 3 | #include <stdio.h> |
| 4 | #include <string.h> |
| 5 | #include <assert.h> |
| 6 | |
| 7 | #define LWS_ZLIB_WINDOW_BITS 15 |
| 8 | #define LWS_ZLIB_MEMLEVEL 8 |
| 9 | |
| 10 | int lws_extension_callback_deflate_frame( |
| 11 | struct libwebsocket_context *context, |
| 12 | struct libwebsocket_extension *ext, |
| 13 | struct libwebsocket *wsi, |
| 14 | enum libwebsocket_extension_callback_reasons reason, |
| 15 | void *user, void *in, size_t len) |
| 16 | { |
| 17 | struct lws_ext_deflate_frame_conn *conn = |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 18 | (struct lws_ext_deflate_frame_conn *)user; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 19 | struct lws_tokens *eff_buf = (struct lws_tokens *)in; |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 20 | size_t current_payload, remaining_payload, total_payload; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 21 | int n; |
Andy Green | d678ea3 | 2013-01-12 23:09:36 +0800 | [diff] [blame] | 22 | size_t len_so_far; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 23 | |
| 24 | switch (reason) { |
| 25 | |
| 26 | /* |
| 27 | * for deflate-frame, both client and server sides act the same |
| 28 | */ |
| 29 | |
| 30 | case LWS_EXT_CALLBACK_CLIENT_CONSTRUCT: |
| 31 | case LWS_EXT_CALLBACK_CONSTRUCT: |
| 32 | conn->zs_in.zalloc = conn->zs_out.zalloc = Z_NULL; |
| 33 | conn->zs_in.zfree = conn->zs_out.zfree = Z_NULL; |
| 34 | conn->zs_in.opaque = conn->zs_out.opaque = Z_NULL; |
| 35 | n = inflateInit2(&conn->zs_in, -LWS_ZLIB_WINDOW_BITS); |
| 36 | if (n != Z_OK) { |
Andy Green | f7609e9 | 2013-01-14 13:10:55 +0800 | [diff] [blame] | 37 | lwsl_ext("deflateInit returned %d\n", n); |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 38 | return 1; |
| 39 | } |
| 40 | n = deflateInit2(&conn->zs_out, |
David Galeano | ed3bc90 | 2013-01-10 10:24:32 +0800 | [diff] [blame] | 41 | (context->listen_port ? |
| 42 | DEFLATE_FRAME_COMPRESSION_LEVEL_SERVER : |
| 43 | DEFLATE_FRAME_COMPRESSION_LEVEL_CLIENT), |
| 44 | Z_DEFLATED, |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 45 | -LWS_ZLIB_WINDOW_BITS, LWS_ZLIB_MEMLEVEL, |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 46 | Z_DEFAULT_STRATEGY); |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 47 | if (n != Z_OK) { |
Andy Green | f7609e9 | 2013-01-14 13:10:55 +0800 | [diff] [blame] | 48 | lwsl_ext("deflateInit2 returned %d\n", n); |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 49 | return 1; |
| 50 | } |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 51 | conn->buf_pre_used = 0; |
| 52 | conn->buf_pre_length = 0; |
Andy Green | b5b2319 | 2013-02-11 17:13:32 +0800 | [diff] [blame] | 53 | conn->buf_in_length = sizeof(conn->buf_in); |
| 54 | conn->buf_out_length = sizeof(conn->buf_out); |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 55 | conn->compressed_out = 0; |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 56 | conn->buf_pre = NULL; |
| 57 | conn->buf_in = (unsigned char *) |
| 58 | malloc(LWS_SEND_BUFFER_PRE_PADDING + |
| 59 | conn->buf_in_length + |
| 60 | LWS_SEND_BUFFER_POST_PADDING); |
Andy Green | 988bd98 | 2013-01-10 12:26:13 +0800 | [diff] [blame] | 61 | if (!conn->buf_in) |
| 62 | goto bail; |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 63 | conn->buf_out = (unsigned char *) |
| 64 | malloc(LWS_SEND_BUFFER_PRE_PADDING + |
| 65 | conn->buf_out_length + |
| 66 | LWS_SEND_BUFFER_POST_PADDING); |
Andy Green | 988bd98 | 2013-01-10 12:26:13 +0800 | [diff] [blame] | 67 | if (!conn->buf_out) |
| 68 | goto bail; |
Andy Green | 43db045 | 2013-01-10 19:50:35 +0800 | [diff] [blame] | 69 | lwsl_ext("zlibs constructed\n"); |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 70 | break; |
Andy Green | 988bd98 | 2013-01-10 12:26:13 +0800 | [diff] [blame] | 71 | bail: |
Andy Green | 43db045 | 2013-01-10 19:50:35 +0800 | [diff] [blame] | 72 | lwsl_err("Out of mem\n"); |
Andy Green | 988bd98 | 2013-01-10 12:26:13 +0800 | [diff] [blame] | 73 | (void)inflateEnd(&conn->zs_in); |
| 74 | (void)deflateEnd(&conn->zs_out); |
| 75 | return -1; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 76 | |
| 77 | case LWS_EXT_CALLBACK_DESTROY: |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 78 | if (conn->buf_pre) |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 79 | free(conn->buf_pre); |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 80 | free(conn->buf_in); |
| 81 | free(conn->buf_out); |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 82 | conn->buf_pre_used = 0; |
| 83 | conn->buf_pre_length = 0; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 84 | conn->buf_in_length = 0; |
| 85 | conn->buf_out_length = 0; |
| 86 | conn->compressed_out = 0; |
| 87 | (void)inflateEnd(&conn->zs_in); |
| 88 | (void)deflateEnd(&conn->zs_out); |
Andy Green | 43db045 | 2013-01-10 19:50:35 +0800 | [diff] [blame] | 89 | lwsl_ext("zlibs destructed\n"); |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 90 | break; |
| 91 | |
| 92 | case LWS_EXT_CALLBACK_PAYLOAD_RX: |
Andy Green | 623a98d | 2013-01-21 11:04:23 +0800 | [diff] [blame] | 93 | if (!(wsi->u.ws.rsv & 0x40)) |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 94 | return 0; |
| 95 | |
| 96 | /* |
| 97 | * inflate the incoming payload |
| 98 | */ |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 99 | current_payload = eff_buf->token_len; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 100 | |
Andy Green | 623a98d | 2013-01-21 11:04:23 +0800 | [diff] [blame] | 101 | remaining_payload = wsi->u.ws.rx_packet_length; |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 102 | if (remaining_payload) { |
| 103 | total_payload = conn->buf_pre_used + |
| 104 | current_payload + |
| 105 | remaining_payload; |
| 106 | |
| 107 | if (conn->buf_pre_length < total_payload) { |
| 108 | conn->buf_pre_length = total_payload; |
| 109 | if (conn->buf_pre) |
| 110 | free(conn->buf_pre); |
| 111 | conn->buf_pre = |
| 112 | (unsigned char *)malloc(total_payload + 4); |
Andy Green | 988bd98 | 2013-01-10 12:26:13 +0800 | [diff] [blame] | 113 | if (!conn->buf_pre) { |
Andy Green | 43db045 | 2013-01-10 19:50:35 +0800 | [diff] [blame] | 114 | lwsl_err("Out of memory\n"); |
Andy Green | 988bd98 | 2013-01-10 12:26:13 +0800 | [diff] [blame] | 115 | return -1; |
| 116 | } |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | memcpy(conn->buf_pre + conn->buf_pre_used, |
| 120 | eff_buf->token, current_payload); |
| 121 | conn->buf_pre_used += current_payload; |
| 122 | |
| 123 | eff_buf->token = NULL; |
| 124 | eff_buf->token_len = 0; |
| 125 | |
| 126 | return 0; |
| 127 | } |
| 128 | if (conn->buf_pre_used) { |
| 129 | total_payload = conn->buf_pre_used + |
| 130 | current_payload; |
| 131 | |
| 132 | memcpy(conn->buf_pre + conn->buf_pre_used, |
| 133 | eff_buf->token, current_payload); |
| 134 | conn->buf_pre_used = 0; |
| 135 | |
| 136 | conn->zs_in.next_in = conn->buf_pre; |
| 137 | } else { |
| 138 | total_payload = current_payload; |
| 139 | |
| 140 | conn->zs_in.next_in = (unsigned char *)eff_buf->token; |
| 141 | } |
| 142 | |
| 143 | conn->zs_in.next_in[total_payload + 0] = 0; |
| 144 | conn->zs_in.next_in[total_payload + 1] = 0; |
| 145 | conn->zs_in.next_in[total_payload + 2] = 0xff; |
| 146 | conn->zs_in.next_in[total_payload + 3] = 0xff; |
| 147 | |
| 148 | conn->zs_in.avail_in = total_payload + 4; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 149 | |
Andy Green | b5b2319 | 2013-02-11 17:13:32 +0800 | [diff] [blame] | 150 | conn->zs_in.next_out = |
| 151 | conn->buf_in + LWS_SEND_BUFFER_PRE_PADDING; |
| 152 | conn->zs_in.avail_out = conn->buf_in_length; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 153 | |
Andy Green | b5b2319 | 2013-02-11 17:13:32 +0800 | [diff] [blame] | 154 | while (1) { |
| 155 | n = inflate(&conn->zs_in, Z_SYNC_FLUSH); |
| 156 | switch (n) { |
| 157 | case Z_NEED_DICT: |
| 158 | case Z_STREAM_ERROR: |
| 159 | case Z_DATA_ERROR: |
| 160 | case Z_MEM_ERROR: |
Andy Green | d678ea3 | 2013-01-12 23:09:36 +0800 | [diff] [blame] | 161 | /* |
Andy Green | b5b2319 | 2013-02-11 17:13:32 +0800 | [diff] [blame] | 162 | * screwed.. close the connection... |
| 163 | * we will get a destroy callback to take care |
| 164 | * of closing nicely |
Andy Green | d678ea3 | 2013-01-12 23:09:36 +0800 | [diff] [blame] | 165 | */ |
Andy Green | 706961d | 2013-01-17 16:50:35 +0800 | [diff] [blame] | 166 | lwsl_err("zlib error inflate %d: %s\n", |
Andy Green | d678ea3 | 2013-01-12 23:09:36 +0800 | [diff] [blame] | 167 | n, conn->zs_in.msg); |
| 168 | return -1; |
| 169 | } |
| 170 | |
| 171 | if (conn->zs_in.avail_out) |
| 172 | break; |
| 173 | |
| 174 | len_so_far = conn->zs_in.next_out - |
| 175 | (conn->buf_in + LWS_SEND_BUFFER_PRE_PADDING); |
| 176 | |
| 177 | conn->buf_in_length *= 2; |
| 178 | if (conn->buf_in_length > LWS_MAX_ZLIB_CONN_BUFFER) { |
Andy Green | b5b2319 | 2013-02-11 17:13:32 +0800 | [diff] [blame] | 179 | lwsl_ext("zlib in buffer hit limit %u\n", |
Andy Green | d678ea3 | 2013-01-12 23:09:36 +0800 | [diff] [blame] | 180 | LWS_MAX_ZLIB_CONN_BUFFER); |
| 181 | return -1; |
| 182 | } |
| 183 | conn->buf_in = (unsigned char *)realloc(conn->buf_in, |
| 184 | LWS_SEND_BUFFER_PRE_PADDING + |
| 185 | conn->buf_in_length + |
| 186 | LWS_SEND_BUFFER_POST_PADDING); |
| 187 | if (!conn->buf_in) { |
| 188 | lwsl_err("Out of memory\n"); |
| 189 | return -1; |
| 190 | } |
| 191 | lwsl_debug( |
| 192 | "deflate-frame ext RX did realloc to %ld\n", |
| 193 | conn->buf_in_length); |
| 194 | conn->zs_in.next_out = conn->buf_in + |
Andy Green | b5b2319 | 2013-02-11 17:13:32 +0800 | [diff] [blame] | 195 | LWS_SEND_BUFFER_PRE_PADDING + len_so_far; |
Andy Green | d678ea3 | 2013-01-12 23:09:36 +0800 | [diff] [blame] | 196 | conn->zs_in.avail_out = |
Andy Green | b5b2319 | 2013-02-11 17:13:32 +0800 | [diff] [blame] | 197 | conn->buf_in_length - len_so_far; |
| 198 | } |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 199 | |
| 200 | /* rewrite the buffer pointers and length */ |
Andy Green | b5b2319 | 2013-02-11 17:13:32 +0800 | [diff] [blame] | 201 | eff_buf->token = |
| 202 | (char *)(conn->buf_in + LWS_SEND_BUFFER_PRE_PADDING); |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 203 | eff_buf->token_len = (int)(conn->zs_in.next_out - |
| 204 | (conn->buf_in + LWS_SEND_BUFFER_PRE_PADDING)); |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 205 | |
| 206 | return 0; |
| 207 | |
| 208 | case LWS_EXT_CALLBACK_PAYLOAD_TX: |
| 209 | /* |
| 210 | * deflate the outgoing payload |
| 211 | */ |
David Galeano | 01d0256 | 2013-01-10 09:51:15 +0800 | [diff] [blame] | 212 | current_payload = eff_buf->token_len; |
| 213 | |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 214 | conn->zs_out.next_in = (unsigned char *)eff_buf->token; |
David Galeano | 01d0256 | 2013-01-10 09:51:15 +0800 | [diff] [blame] | 215 | conn->zs_out.avail_in = current_payload; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 216 | |
Andy Green | b5b2319 | 2013-02-11 17:13:32 +0800 | [diff] [blame] | 217 | conn->zs_out.next_out = |
| 218 | conn->buf_out + LWS_SEND_BUFFER_PRE_PADDING; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 219 | conn->zs_out.avail_out = conn->buf_out_length; |
| 220 | |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 221 | while (1) { |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 222 | n = deflate(&conn->zs_out, Z_SYNC_FLUSH); |
| 223 | if (n == Z_STREAM_ERROR) { |
| 224 | /* |
Andy Green | b5b2319 | 2013-02-11 17:13:32 +0800 | [diff] [blame] | 225 | * screwed.. close the connection... we will |
| 226 | * get a destroy callback to take care of |
| 227 | * closing nicely |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 228 | */ |
Andy Green | f7609e9 | 2013-01-14 13:10:55 +0800 | [diff] [blame] | 229 | lwsl_ext("zlib error deflate\n"); |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 230 | |
| 231 | return -1; |
| 232 | } |
| 233 | |
Andy Green | d678ea3 | 2013-01-12 23:09:36 +0800 | [diff] [blame] | 234 | if (conn->zs_out.avail_out) |
| 235 | break; |
| 236 | |
| 237 | len_so_far = (conn->zs_out.next_out - |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 238 | (conn->buf_out + |
| 239 | LWS_SEND_BUFFER_PRE_PADDING)); |
Andy Green | d678ea3 | 2013-01-12 23:09:36 +0800 | [diff] [blame] | 240 | conn->buf_out_length *= 2; |
| 241 | if (conn->buf_out_length > LWS_MAX_ZLIB_CONN_BUFFER) { |
Andy Green | b5b2319 | 2013-02-11 17:13:32 +0800 | [diff] [blame] | 242 | lwsl_ext("zlib out hit limit %u\n", |
| 243 | LWS_MAX_ZLIB_CONN_BUFFER); |
Andy Green | d678ea3 | 2013-01-12 23:09:36 +0800 | [diff] [blame] | 244 | return -1; |
| 245 | } |
| 246 | conn->buf_out = (unsigned char *)realloc( |
| 247 | conn->buf_out, |
| 248 | LWS_SEND_BUFFER_PRE_PADDING + |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 249 | conn->buf_out_length + |
David Galeano | 01d0256 | 2013-01-10 09:51:15 +0800 | [diff] [blame] | 250 | LWS_SEND_BUFFER_POST_PADDING); |
Andy Green | d678ea3 | 2013-01-12 23:09:36 +0800 | [diff] [blame] | 251 | if (!conn->buf_out) { |
| 252 | lwsl_err("Out of memory\n"); |
| 253 | return -1; |
| 254 | } |
| 255 | lwsl_debug( |
| 256 | "deflate-frame ext TX did realloc to %ld\n", |
| 257 | conn->buf_in_length); |
| 258 | |
| 259 | conn->zs_out.next_out = (conn->buf_out + |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 260 | LWS_SEND_BUFFER_PRE_PADDING + len_so_far); |
Andy Green | d678ea3 | 2013-01-12 23:09:36 +0800 | [diff] [blame] | 261 | conn->zs_out.avail_out = |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 262 | (conn->buf_out_length - len_so_far); |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | conn->compressed_out = 1; |
| 266 | |
| 267 | /* rewrite the buffer pointers and length */ |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 268 | eff_buf->token = (char *)(conn->buf_out + |
| 269 | LWS_SEND_BUFFER_PRE_PADDING); |
| 270 | eff_buf->token_len = (int)(conn->zs_out.next_out - |
| 271 | (conn->buf_out + LWS_SEND_BUFFER_PRE_PADDING)) - 4; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 272 | |
| 273 | return 0; |
| 274 | |
| 275 | case LWS_EXT_CALLBACK_PACKET_TX_PRESEND: |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 276 | if (conn->compressed_out) { |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 277 | conn->compressed_out = 0; |
| 278 | *((unsigned char *)eff_buf->token) |= 0x40; |
| 279 | } |
| 280 | break; |
| 281 | |
| 282 | case LWS_EXT_CALLBACK_CHECK_OK_TO_PROPOSE_EXTENSION: |
| 283 | /* Avoid x-webkit-deflate-frame extension on client */ |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 284 | if (!strcmp((char *)in, "x-webkit-deflate-frame")) |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 285 | return 1; |
David Galeano | 85a0921 | 2013-01-09 18:21:33 +0800 | [diff] [blame] | 286 | break; |
| 287 | |
| 288 | default: |
| 289 | break; |
| 290 | } |
| 291 | |
| 292 | return 0; |
| 293 | } |
David Galeano | 2605ffe | 2013-01-10 09:41:06 +0800 | [diff] [blame] | 294 | |