| /* |
| * QEMU I/O channels driver websockets |
| * |
| * Copyright (c) 2015 Red Hat, Inc. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "qemu/bswap.h" |
| #include "io/channel-websock.h" |
| #include "crypto/hash.h" |
| #include "trace.h" |
| |
| |
| /* Max amount to allow in rawinput/rawoutput buffers */ |
| #define QIO_CHANNEL_WEBSOCK_MAX_BUFFER 8192 |
| |
| #define QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN 24 |
| #define QIO_CHANNEL_WEBSOCK_GUID "258EAFA5-E914-47DA-95CA-C5AB0DC85B11" |
| #define QIO_CHANNEL_WEBSOCK_GUID_LEN strlen(QIO_CHANNEL_WEBSOCK_GUID) |
| |
| #define QIO_CHANNEL_WEBSOCK_HEADER_PROTOCOL "sec-websocket-protocol" |
| #define QIO_CHANNEL_WEBSOCK_HEADER_VERSION "sec-websocket-version" |
| #define QIO_CHANNEL_WEBSOCK_HEADER_KEY "sec-websocket-key" |
| #define QIO_CHANNEL_WEBSOCK_HEADER_UPGRADE "upgrade" |
| #define QIO_CHANNEL_WEBSOCK_HEADER_HOST "host" |
| #define QIO_CHANNEL_WEBSOCK_HEADER_CONNECTION "connection" |
| |
| #define QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY "binary" |
| #define QIO_CHANNEL_WEBSOCK_CONNECTION_UPGRADE "Upgrade" |
| #define QIO_CHANNEL_WEBSOCK_UPGRADE_WEBSOCKET "websocket" |
| |
| #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RESPONSE \ |
| "HTTP/1.1 101 Switching Protocols\r\n" \ |
| "Upgrade: websocket\r\n" \ |
| "Connection: Upgrade\r\n" \ |
| "Sec-WebSocket-Accept: %s\r\n" \ |
| "Sec-WebSocket-Protocol: binary\r\n" \ |
| "\r\n" |
| #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM "\r\n" |
| #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_END "\r\n\r\n" |
| #define QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION "13" |
| #define QIO_CHANNEL_WEBSOCK_HTTP_METHOD "GET" |
| #define QIO_CHANNEL_WEBSOCK_HTTP_PATH "/" |
| #define QIO_CHANNEL_WEBSOCK_HTTP_VERSION "HTTP/1.1" |
| |
| /* The websockets packet header is variable length |
| * depending on the size of the payload... */ |
| |
| /* ...length when using 7-bit payload length */ |
| #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT 6 |
| /* ...length when using 16-bit payload length */ |
| #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT 8 |
| /* ...length when using 64-bit payload length */ |
| #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT 14 |
| |
| /* Length of the optional data mask field in header */ |
| #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_MASK 4 |
| |
| /* Maximum length that can fit in 7-bit payload size */ |
| #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_7_BIT 126 |
| /* Maximum length that can fit in 16-bit payload size */ |
| #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_16_BIT 65536 |
| |
| /* Magic 7-bit length to indicate use of 16-bit payload length */ |
| #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT 126 |
| /* Magic 7-bit length to indicate use of 64-bit payload length */ |
| #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT 127 |
| |
| /* Bitmasks & shifts for accessing header fields */ |
| #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN 0x80 |
| #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE 0x0f |
| #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_HAS_MASK 0x80 |
| #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_PAYLOAD_LEN 0x7f |
| #define QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_FIN 7 |
| #define QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_HAS_MASK 7 |
| |
| typedef struct QIOChannelWebsockHeader QIOChannelWebsockHeader; |
| |
| struct QEMU_PACKED QIOChannelWebsockHeader { |
| unsigned char b0; |
| unsigned char b1; |
| union { |
| struct QEMU_PACKED { |
| uint16_t l16; |
| QIOChannelWebsockMask m16; |
| } s16; |
| struct QEMU_PACKED { |
| uint64_t l64; |
| QIOChannelWebsockMask m64; |
| } s64; |
| QIOChannelWebsockMask m; |
| } u; |
| }; |
| |
| typedef struct QIOChannelWebsockHTTPHeader QIOChannelWebsockHTTPHeader; |
| |
| struct QIOChannelWebsockHTTPHeader { |
| char *name; |
| char *value; |
| }; |
| |
| enum { |
| QIO_CHANNEL_WEBSOCK_OPCODE_CONTINUATION = 0x0, |
| QIO_CHANNEL_WEBSOCK_OPCODE_TEXT_FRAME = 0x1, |
| QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME = 0x2, |
| QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE = 0x8, |
| QIO_CHANNEL_WEBSOCK_OPCODE_PING = 0x9, |
| QIO_CHANNEL_WEBSOCK_OPCODE_PONG = 0xA |
| }; |
| |
| static size_t |
| qio_channel_websock_extract_headers(char *buffer, |
| QIOChannelWebsockHTTPHeader *hdrs, |
| size_t nhdrsalloc, |
| Error **errp) |
| { |
| char *nl, *sep, *tmp; |
| size_t nhdrs = 0; |
| |
| /* |
| * First parse the HTTP protocol greeting of format: |
| * |
| * $METHOD $PATH $VERSION |
| * |
| * e.g. |
| * |
| * GET / HTTP/1.1 |
| */ |
| |
| nl = strstr(buffer, QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM); |
| if (!nl) { |
| error_setg(errp, "Missing HTTP header delimiter"); |
| return 0; |
| } |
| *nl = '\0'; |
| |
| tmp = strchr(buffer, ' '); |
| if (!tmp) { |
| error_setg(errp, "Missing HTTP path delimiter"); |
| return 0; |
| } |
| *tmp = '\0'; |
| |
| if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_METHOD)) { |
| error_setg(errp, "Unsupported HTTP method %s", buffer); |
| return 0; |
| } |
| |
| buffer = tmp + 1; |
| tmp = strchr(buffer, ' '); |
| if (!tmp) { |
| error_setg(errp, "Missing HTTP version delimiter"); |
| return 0; |
| } |
| *tmp = '\0'; |
| |
| if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_PATH)) { |
| error_setg(errp, "Unexpected HTTP path %s", buffer); |
| return 0; |
| } |
| |
| buffer = tmp + 1; |
| |
| if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_VERSION)) { |
| error_setg(errp, "Unsupported HTTP version %s", buffer); |
| return 0; |
| } |
| |
| buffer = nl + strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM); |
| |
| /* |
| * Now parse all the header fields of format |
| * |
| * $NAME: $VALUE |
| * |
| * e.g. |
| * |
| * Cache-control: no-cache |
| */ |
| do { |
| QIOChannelWebsockHTTPHeader *hdr; |
| |
| nl = strstr(buffer, QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM); |
| if (nl) { |
| *nl = '\0'; |
| } |
| |
| sep = strchr(buffer, ':'); |
| if (!sep) { |
| error_setg(errp, "Malformed HTTP header"); |
| return 0; |
| } |
| *sep = '\0'; |
| sep++; |
| while (*sep == ' ') { |
| sep++; |
| } |
| |
| if (nhdrs >= nhdrsalloc) { |
| error_setg(errp, "Too many HTTP headers"); |
| return 0; |
| } |
| |
| hdr = &hdrs[nhdrs++]; |
| hdr->name = buffer; |
| hdr->value = sep; |
| |
| /* Canonicalize header name for easier identification later */ |
| for (tmp = hdr->name; *tmp; tmp++) { |
| *tmp = g_ascii_tolower(*tmp); |
| } |
| |
| if (nl) { |
| buffer = nl + strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM); |
| } |
| } while (nl != NULL); |
| |
| return nhdrs; |
| } |
| |
| static const char * |
| qio_channel_websock_find_header(QIOChannelWebsockHTTPHeader *hdrs, |
| size_t nhdrs, |
| const char *name) |
| { |
| size_t i; |
| |
| for (i = 0; i < nhdrs; i++) { |
| if (g_str_equal(hdrs[i].name, name)) { |
| return hdrs[i].value; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| |
| static int qio_channel_websock_handshake_send_response(QIOChannelWebsock *ioc, |
| const char *key, |
| Error **errp) |
| { |
| char combined_key[QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN + |
| QIO_CHANNEL_WEBSOCK_GUID_LEN + 1]; |
| char *accept = NULL, *response = NULL; |
| size_t responselen; |
| |
| g_strlcpy(combined_key, key, QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN + 1); |
| g_strlcat(combined_key, QIO_CHANNEL_WEBSOCK_GUID, |
| QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN + |
| QIO_CHANNEL_WEBSOCK_GUID_LEN + 1); |
| |
| /* hash and encode it */ |
| if (qcrypto_hash_base64(QCRYPTO_HASH_ALG_SHA1, |
| combined_key, |
| QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN + |
| QIO_CHANNEL_WEBSOCK_GUID_LEN, |
| &accept, |
| errp) < 0) { |
| return -1; |
| } |
| |
| response = g_strdup_printf(QIO_CHANNEL_WEBSOCK_HANDSHAKE_RESPONSE, accept); |
| responselen = strlen(response); |
| buffer_reserve(&ioc->encoutput, responselen); |
| buffer_append(&ioc->encoutput, response, responselen); |
| |
| g_free(accept); |
| g_free(response); |
| |
| return 0; |
| } |
| |
| static int qio_channel_websock_handshake_process(QIOChannelWebsock *ioc, |
| char *buffer, |
| Error **errp) |
| { |
| QIOChannelWebsockHTTPHeader hdrs[32]; |
| size_t nhdrs = G_N_ELEMENTS(hdrs); |
| const char *protocols = NULL, *version = NULL, *key = NULL, |
| *host = NULL, *connection = NULL, *upgrade = NULL; |
| |
| nhdrs = qio_channel_websock_extract_headers(buffer, hdrs, nhdrs, errp); |
| if (!nhdrs) { |
| return -1; |
| } |
| |
| protocols = qio_channel_websock_find_header( |
| hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_PROTOCOL); |
| if (!protocols) { |
| error_setg(errp, "Missing websocket protocol header data"); |
| return -1; |
| } |
| |
| version = qio_channel_websock_find_header( |
| hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_VERSION); |
| if (!version) { |
| error_setg(errp, "Missing websocket version header data"); |
| return -1; |
| } |
| |
| key = qio_channel_websock_find_header( |
| hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_KEY); |
| if (!key) { |
| error_setg(errp, "Missing websocket key header data"); |
| return -1; |
| } |
| |
| host = qio_channel_websock_find_header( |
| hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_HOST); |
| if (!host) { |
| error_setg(errp, "Missing websocket host header data"); |
| return -1; |
| } |
| |
| connection = qio_channel_websock_find_header( |
| hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_CONNECTION); |
| if (!connection) { |
| error_setg(errp, "Missing websocket connection header data"); |
| return -1; |
| } |
| |
| upgrade = qio_channel_websock_find_header( |
| hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_UPGRADE); |
| if (!upgrade) { |
| error_setg(errp, "Missing websocket upgrade header data"); |
| return -1; |
| } |
| |
| if (!g_strrstr(protocols, QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY)) { |
| error_setg(errp, "No '%s' protocol is supported by client '%s'", |
| QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY, protocols); |
| return -1; |
| } |
| |
| if (!g_str_equal(version, QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION)) { |
| error_setg(errp, "Version '%s' is not supported by client '%s'", |
| QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION, version); |
| return -1; |
| } |
| |
| if (strlen(key) != QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN) { |
| error_setg(errp, "Key length '%zu' was not as expected '%d'", |
| strlen(key), QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN); |
| return -1; |
| } |
| |
| if (!g_strrstr(connection, QIO_CHANNEL_WEBSOCK_CONNECTION_UPGRADE)) { |
| error_setg(errp, "No connection upgrade requested '%s'", connection); |
| return -1; |
| } |
| |
| if (!g_str_equal(upgrade, QIO_CHANNEL_WEBSOCK_UPGRADE_WEBSOCKET)) { |
| error_setg(errp, "Incorrect upgrade method '%s'", upgrade); |
| return -1; |
| } |
| |
| return qio_channel_websock_handshake_send_response(ioc, key, errp); |
| } |
| |
| static int qio_channel_websock_handshake_read(QIOChannelWebsock *ioc, |
| Error **errp) |
| { |
| char *handshake_end; |
| ssize_t ret; |
| /* Typical HTTP headers from novnc are 512 bytes, so limiting |
| * total header size to 4096 is easily enough. */ |
| size_t want = 4096 - ioc->encinput.offset; |
| buffer_reserve(&ioc->encinput, want); |
| ret = qio_channel_read(ioc->master, |
| (char *)buffer_end(&ioc->encinput), want, errp); |
| if (ret < 0) { |
| return -1; |
| } |
| ioc->encinput.offset += ret; |
| |
| handshake_end = g_strstr_len((char *)ioc->encinput.buffer, |
| ioc->encinput.offset, |
| QIO_CHANNEL_WEBSOCK_HANDSHAKE_END); |
| if (!handshake_end) { |
| if (ioc->encinput.offset >= 4096) { |
| error_setg(errp, |
| "End of headers not found in first 4096 bytes"); |
| return -1; |
| } else { |
| return 0; |
| } |
| } |
| *handshake_end = '\0'; |
| |
| if (qio_channel_websock_handshake_process(ioc, |
| (char *)ioc->encinput.buffer, |
| errp) < 0) { |
| return -1; |
| } |
| |
| buffer_advance(&ioc->encinput, |
| handshake_end - (char *)ioc->encinput.buffer + |
| strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_END)); |
| return 1; |
| } |
| |
| static gboolean qio_channel_websock_handshake_send(QIOChannel *ioc, |
| GIOCondition condition, |
| gpointer user_data) |
| { |
| QIOTask *task = user_data; |
| QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK( |
| qio_task_get_source(task)); |
| Error *err = NULL; |
| ssize_t ret; |
| |
| ret = qio_channel_write(wioc->master, |
| (char *)wioc->encoutput.buffer, |
| wioc->encoutput.offset, |
| &err); |
| |
| if (ret < 0) { |
| trace_qio_channel_websock_handshake_fail(ioc); |
| qio_task_set_error(task, err); |
| qio_task_complete(task); |
| return FALSE; |
| } |
| |
| buffer_advance(&wioc->encoutput, ret); |
| if (wioc->encoutput.offset == 0) { |
| trace_qio_channel_websock_handshake_complete(ioc); |
| qio_task_complete(task); |
| return FALSE; |
| } |
| trace_qio_channel_websock_handshake_pending(ioc, G_IO_OUT); |
| return TRUE; |
| } |
| |
| static gboolean qio_channel_websock_handshake_io(QIOChannel *ioc, |
| GIOCondition condition, |
| gpointer user_data) |
| { |
| QIOTask *task = user_data; |
| QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK( |
| qio_task_get_source(task)); |
| Error *err = NULL; |
| int ret; |
| |
| ret = qio_channel_websock_handshake_read(wioc, &err); |
| if (ret < 0) { |
| trace_qio_channel_websock_handshake_fail(ioc); |
| qio_task_set_error(task, err); |
| qio_task_complete(task); |
| return FALSE; |
| } |
| if (ret == 0) { |
| trace_qio_channel_websock_handshake_pending(ioc, G_IO_IN); |
| /* need more data still */ |
| return TRUE; |
| } |
| |
| trace_qio_channel_websock_handshake_reply(ioc); |
| qio_channel_add_watch( |
| wioc->master, |
| G_IO_OUT, |
| qio_channel_websock_handshake_send, |
| task, |
| NULL); |
| return FALSE; |
| } |
| |
| |
| static void qio_channel_websock_encode(QIOChannelWebsock *ioc) |
| { |
| size_t header_size; |
| union { |
| char buf[QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT]; |
| QIOChannelWebsockHeader ws; |
| } header; |
| |
| if (!ioc->rawoutput.offset) { |
| return; |
| } |
| |
| header.ws.b0 = (1 << QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_FIN) | |
| (QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME & |
| QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE); |
| if (ioc->rawoutput.offset < |
| QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_7_BIT) { |
| header.ws.b1 = (uint8_t)ioc->rawoutput.offset; |
| header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT; |
| } else if (ioc->rawoutput.offset < |
| QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_16_BIT) { |
| header.ws.b1 = QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT; |
| header.ws.u.s16.l16 = cpu_to_be16((uint16_t)ioc->rawoutput.offset); |
| header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT; |
| } else { |
| header.ws.b1 = QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT; |
| header.ws.u.s64.l64 = cpu_to_be64(ioc->rawoutput.offset); |
| header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT; |
| } |
| header_size -= QIO_CHANNEL_WEBSOCK_HEADER_LEN_MASK; |
| |
| buffer_reserve(&ioc->encoutput, header_size + ioc->rawoutput.offset); |
| buffer_append(&ioc->encoutput, header.buf, header_size); |
| buffer_append(&ioc->encoutput, ioc->rawoutput.buffer, |
| ioc->rawoutput.offset); |
| buffer_reset(&ioc->rawoutput); |
| } |
| |
| |
| static ssize_t qio_channel_websock_decode_header(QIOChannelWebsock *ioc, |
| Error **errp) |
| { |
| unsigned char opcode, fin, has_mask; |
| size_t header_size; |
| size_t payload_len; |
| QIOChannelWebsockHeader *header = |
| (QIOChannelWebsockHeader *)ioc->encinput.buffer; |
| |
| if (ioc->payload_remain) { |
| error_setg(errp, |
| "Decoding header but %zu bytes of payload remain", |
| ioc->payload_remain); |
| return -1; |
| } |
| if (ioc->encinput.offset < QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT) { |
| /* header not complete */ |
| return QIO_CHANNEL_ERR_BLOCK; |
| } |
| |
| fin = (header->b0 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN) >> |
| QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_FIN; |
| opcode = header->b0 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE; |
| has_mask = (header->b1 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_HAS_MASK) >> |
| QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_HAS_MASK; |
| payload_len = header->b1 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_PAYLOAD_LEN; |
| |
| if (opcode == QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE) { |
| /* disconnect */ |
| return 0; |
| } |
| |
| /* Websocket frame sanity check: |
| * * Websocket fragmentation is not supported. |
| * * All websockets frames sent by a client have to be masked. |
| * * Only binary encoding is supported. |
| */ |
| if (!fin) { |
| error_setg(errp, "websocket fragmentation is not supported"); |
| return -1; |
| } |
| if (!has_mask) { |
| error_setg(errp, "websocket frames must be masked"); |
| return -1; |
| } |
| if (opcode != QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME) { |
| error_setg(errp, "only binary websocket frames are supported"); |
| return -1; |
| } |
| |
| if (payload_len < QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT) { |
| ioc->payload_remain = payload_len; |
| header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT; |
| ioc->mask = header->u.m; |
| } else if (payload_len == QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT && |
| ioc->encinput.offset >= QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT) { |
| ioc->payload_remain = be16_to_cpu(header->u.s16.l16); |
| header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT; |
| ioc->mask = header->u.s16.m16; |
| } else if (payload_len == QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT && |
| ioc->encinput.offset >= QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT) { |
| ioc->payload_remain = be64_to_cpu(header->u.s64.l64); |
| header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT; |
| ioc->mask = header->u.s64.m64; |
| } else { |
| /* header not complete */ |
| return QIO_CHANNEL_ERR_BLOCK; |
| } |
| |
| buffer_advance(&ioc->encinput, header_size); |
| return 1; |
| } |
| |
| |
| static ssize_t qio_channel_websock_decode_payload(QIOChannelWebsock *ioc, |
| Error **errp) |
| { |
| size_t i; |
| size_t payload_len; |
| uint32_t *payload32; |
| |
| if (!ioc->payload_remain) { |
| error_setg(errp, |
| "Decoding payload but no bytes of payload remain"); |
| return -1; |
| } |
| |
| /* If we aren't at the end of the payload, then drop |
| * off the last bytes, so we're always multiple of 4 |
| * for purpose of unmasking, except at end of payload |
| */ |
| if (ioc->encinput.offset < ioc->payload_remain) { |
| payload_len = ioc->encinput.offset - (ioc->encinput.offset % 4); |
| } else { |
| payload_len = ioc->payload_remain; |
| } |
| if (payload_len == 0) { |
| return QIO_CHANNEL_ERR_BLOCK; |
| } |
| |
| ioc->payload_remain -= payload_len; |
| |
| /* unmask frame */ |
| /* process 1 frame (32 bit op) */ |
| payload32 = (uint32_t *)ioc->encinput.buffer; |
| for (i = 0; i < payload_len / 4; i++) { |
| payload32[i] ^= ioc->mask.u; |
| } |
| /* process the remaining bytes (if any) */ |
| for (i *= 4; i < payload_len; i++) { |
| ioc->encinput.buffer[i] ^= ioc->mask.c[i % 4]; |
| } |
| |
| buffer_reserve(&ioc->rawinput, payload_len); |
| buffer_append(&ioc->rawinput, ioc->encinput.buffer, payload_len); |
| buffer_advance(&ioc->encinput, payload_len); |
| return payload_len; |
| } |
| |
| |
| QIOChannelWebsock * |
| qio_channel_websock_new_server(QIOChannel *master) |
| { |
| QIOChannelWebsock *wioc; |
| QIOChannel *ioc; |
| |
| wioc = QIO_CHANNEL_WEBSOCK(object_new(TYPE_QIO_CHANNEL_WEBSOCK)); |
| ioc = QIO_CHANNEL(wioc); |
| |
| wioc->master = master; |
| if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) { |
| qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN); |
| } |
| object_ref(OBJECT(master)); |
| |
| trace_qio_channel_websock_new_server(wioc, master); |
| return wioc; |
| } |
| |
| void qio_channel_websock_handshake(QIOChannelWebsock *ioc, |
| QIOTaskFunc func, |
| gpointer opaque, |
| GDestroyNotify destroy) |
| { |
| QIOTask *task; |
| |
| task = qio_task_new(OBJECT(ioc), |
| func, |
| opaque, |
| destroy); |
| |
| trace_qio_channel_websock_handshake_start(ioc); |
| trace_qio_channel_websock_handshake_pending(ioc, G_IO_IN); |
| qio_channel_add_watch(ioc->master, |
| G_IO_IN, |
| qio_channel_websock_handshake_io, |
| task, |
| NULL); |
| } |
| |
| |
| static void qio_channel_websock_finalize(Object *obj) |
| { |
| QIOChannelWebsock *ioc = QIO_CHANNEL_WEBSOCK(obj); |
| |
| buffer_free(&ioc->encinput); |
| buffer_free(&ioc->encoutput); |
| buffer_free(&ioc->rawinput); |
| buffer_free(&ioc->rawoutput); |
| object_unref(OBJECT(ioc->master)); |
| if (ioc->io_tag) { |
| g_source_remove(ioc->io_tag); |
| } |
| if (ioc->io_err) { |
| error_free(ioc->io_err); |
| } |
| } |
| |
| |
| static ssize_t qio_channel_websock_read_wire(QIOChannelWebsock *ioc, |
| Error **errp) |
| { |
| ssize_t ret; |
| |
| if (ioc->encinput.offset < 4096) { |
| size_t want = 4096 - ioc->encinput.offset; |
| |
| buffer_reserve(&ioc->encinput, want); |
| ret = qio_channel_read(ioc->master, |
| (char *)ioc->encinput.buffer + |
| ioc->encinput.offset, |
| want, |
| errp); |
| if (ret < 0) { |
| return ret; |
| } |
| if (ret == 0 && |
| ioc->encinput.offset == 0) { |
| return 0; |
| } |
| ioc->encinput.offset += ret; |
| } |
| |
| while (ioc->encinput.offset != 0) { |
| if (ioc->payload_remain == 0) { |
| ret = qio_channel_websock_decode_header(ioc, errp); |
| if (ret < 0) { |
| return ret; |
| } |
| if (ret == 0) { |
| ioc->io_eof = TRUE; |
| break; |
| } |
| } |
| |
| ret = qio_channel_websock_decode_payload(ioc, errp); |
| if (ret < 0) { |
| return ret; |
| } |
| } |
| return 1; |
| } |
| |
| |
| static ssize_t qio_channel_websock_write_wire(QIOChannelWebsock *ioc, |
| Error **errp) |
| { |
| ssize_t ret; |
| ssize_t done = 0; |
| qio_channel_websock_encode(ioc); |
| |
| while (ioc->encoutput.offset > 0) { |
| ret = qio_channel_write(ioc->master, |
| (char *)ioc->encoutput.buffer, |
| ioc->encoutput.offset, |
| errp); |
| if (ret < 0) { |
| if (ret == QIO_CHANNEL_ERR_BLOCK && |
| done > 0) { |
| return done; |
| } else { |
| return ret; |
| } |
| } |
| buffer_advance(&ioc->encoutput, ret); |
| done += ret; |
| } |
| return done; |
| } |
| |
| |
| static void qio_channel_websock_flush_free(gpointer user_data) |
| { |
| QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(user_data); |
| object_unref(OBJECT(wioc)); |
| } |
| |
| static void qio_channel_websock_set_watch(QIOChannelWebsock *ioc); |
| |
| static gboolean qio_channel_websock_flush(QIOChannel *ioc, |
| GIOCondition condition, |
| gpointer user_data) |
| { |
| QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(user_data); |
| ssize_t ret; |
| |
| if (condition & G_IO_OUT) { |
| ret = qio_channel_websock_write_wire(wioc, &wioc->io_err); |
| if (ret < 0) { |
| goto cleanup; |
| } |
| } |
| |
| if (condition & G_IO_IN) { |
| ret = qio_channel_websock_read_wire(wioc, &wioc->io_err); |
| if (ret < 0) { |
| goto cleanup; |
| } |
| } |
| |
| cleanup: |
| qio_channel_websock_set_watch(wioc); |
| return FALSE; |
| } |
| |
| |
| static void qio_channel_websock_unset_watch(QIOChannelWebsock *ioc) |
| { |
| if (ioc->io_tag) { |
| g_source_remove(ioc->io_tag); |
| ioc->io_tag = 0; |
| } |
| } |
| |
| static void qio_channel_websock_set_watch(QIOChannelWebsock *ioc) |
| { |
| GIOCondition cond = 0; |
| |
| qio_channel_websock_unset_watch(ioc); |
| |
| if (ioc->io_err) { |
| return; |
| } |
| |
| if (ioc->encoutput.offset) { |
| cond |= G_IO_OUT; |
| } |
| if (ioc->encinput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER && |
| !ioc->io_eof) { |
| cond |= G_IO_IN; |
| } |
| |
| if (cond) { |
| object_ref(OBJECT(ioc)); |
| ioc->io_tag = |
| qio_channel_add_watch(ioc->master, |
| cond, |
| qio_channel_websock_flush, |
| ioc, |
| qio_channel_websock_flush_free); |
| } |
| } |
| |
| |
| static ssize_t qio_channel_websock_readv(QIOChannel *ioc, |
| const struct iovec *iov, |
| size_t niov, |
| int **fds, |
| size_t *nfds, |
| Error **errp) |
| { |
| QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc); |
| size_t i; |
| ssize_t got = 0; |
| ssize_t ret; |
| |
| if (wioc->io_err) { |
| error_propagate(errp, error_copy(wioc->io_err)); |
| return -1; |
| } |
| |
| if (!wioc->rawinput.offset) { |
| ret = qio_channel_websock_read_wire(QIO_CHANNEL_WEBSOCK(ioc), errp); |
| if (ret < 0) { |
| return ret; |
| } |
| } |
| |
| for (i = 0 ; i < niov ; i++) { |
| size_t want = iov[i].iov_len; |
| if (want > (wioc->rawinput.offset - got)) { |
| want = (wioc->rawinput.offset - got); |
| } |
| |
| memcpy(iov[i].iov_base, |
| wioc->rawinput.buffer + got, |
| want); |
| got += want; |
| |
| if (want < iov[i].iov_len) { |
| break; |
| } |
| } |
| |
| buffer_advance(&wioc->rawinput, got); |
| qio_channel_websock_set_watch(wioc); |
| return got; |
| } |
| |
| |
| static ssize_t qio_channel_websock_writev(QIOChannel *ioc, |
| const struct iovec *iov, |
| size_t niov, |
| int *fds, |
| size_t nfds, |
| Error **errp) |
| { |
| QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc); |
| size_t i; |
| ssize_t done = 0; |
| ssize_t ret; |
| |
| if (wioc->io_err) { |
| error_propagate(errp, error_copy(wioc->io_err)); |
| return -1; |
| } |
| |
| if (wioc->io_eof) { |
| error_setg(errp, "%s", "Broken pipe"); |
| return -1; |
| } |
| |
| for (i = 0; i < niov; i++) { |
| size_t want = iov[i].iov_len; |
| if ((want + wioc->rawoutput.offset) > QIO_CHANNEL_WEBSOCK_MAX_BUFFER) { |
| want = (QIO_CHANNEL_WEBSOCK_MAX_BUFFER - wioc->rawoutput.offset); |
| } |
| if (want == 0) { |
| goto done; |
| } |
| |
| buffer_reserve(&wioc->rawoutput, want); |
| buffer_append(&wioc->rawoutput, iov[i].iov_base, want); |
| done += want; |
| if (want < iov[i].iov_len) { |
| break; |
| } |
| } |
| |
| done: |
| ret = qio_channel_websock_write_wire(wioc, errp); |
| if (ret < 0 && |
| ret != QIO_CHANNEL_ERR_BLOCK) { |
| qio_channel_websock_unset_watch(wioc); |
| return -1; |
| } |
| |
| qio_channel_websock_set_watch(wioc); |
| |
| if (done == 0) { |
| return QIO_CHANNEL_ERR_BLOCK; |
| } |
| |
| return done; |
| } |
| |
| static int qio_channel_websock_set_blocking(QIOChannel *ioc, |
| bool enabled, |
| Error **errp) |
| { |
| QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc); |
| |
| qio_channel_set_blocking(wioc->master, enabled, errp); |
| return 0; |
| } |
| |
| static void qio_channel_websock_set_delay(QIOChannel *ioc, |
| bool enabled) |
| { |
| QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc); |
| |
| qio_channel_set_delay(tioc->master, enabled); |
| } |
| |
| static void qio_channel_websock_set_cork(QIOChannel *ioc, |
| bool enabled) |
| { |
| QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc); |
| |
| qio_channel_set_cork(tioc->master, enabled); |
| } |
| |
| static int qio_channel_websock_shutdown(QIOChannel *ioc, |
| QIOChannelShutdown how, |
| Error **errp) |
| { |
| QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc); |
| |
| return qio_channel_shutdown(tioc->master, how, errp); |
| } |
| |
| static int qio_channel_websock_close(QIOChannel *ioc, |
| Error **errp) |
| { |
| QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc); |
| |
| return qio_channel_close(wioc->master, errp); |
| } |
| |
| typedef struct QIOChannelWebsockSource QIOChannelWebsockSource; |
| struct QIOChannelWebsockSource { |
| GSource parent; |
| QIOChannelWebsock *wioc; |
| GIOCondition condition; |
| }; |
| |
| static gboolean |
| qio_channel_websock_source_prepare(GSource *source, |
| gint *timeout) |
| { |
| QIOChannelWebsockSource *wsource = (QIOChannelWebsockSource *)source; |
| GIOCondition cond = 0; |
| *timeout = -1; |
| |
| if (wsource->wioc->rawinput.offset) { |
| cond |= G_IO_IN; |
| } |
| if (wsource->wioc->rawoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) { |
| cond |= G_IO_OUT; |
| } |
| |
| return cond & wsource->condition; |
| } |
| |
| static gboolean |
| qio_channel_websock_source_check(GSource *source) |
| { |
| QIOChannelWebsockSource *wsource = (QIOChannelWebsockSource *)source; |
| GIOCondition cond = 0; |
| |
| if (wsource->wioc->rawinput.offset) { |
| cond |= G_IO_IN; |
| } |
| if (wsource->wioc->rawoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) { |
| cond |= G_IO_OUT; |
| } |
| |
| return cond & wsource->condition; |
| } |
| |
| static gboolean |
| qio_channel_websock_source_dispatch(GSource *source, |
| GSourceFunc callback, |
| gpointer user_data) |
| { |
| QIOChannelFunc func = (QIOChannelFunc)callback; |
| QIOChannelWebsockSource *wsource = (QIOChannelWebsockSource *)source; |
| GIOCondition cond = 0; |
| |
| if (wsource->wioc->rawinput.offset) { |
| cond |= G_IO_IN; |
| } |
| if (wsource->wioc->rawoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) { |
| cond |= G_IO_OUT; |
| } |
| |
| return (*func)(QIO_CHANNEL(wsource->wioc), |
| (cond & wsource->condition), |
| user_data); |
| } |
| |
| static void |
| qio_channel_websock_source_finalize(GSource *source) |
| { |
| QIOChannelWebsockSource *ssource = (QIOChannelWebsockSource *)source; |
| |
| object_unref(OBJECT(ssource->wioc)); |
| } |
| |
| GSourceFuncs qio_channel_websock_source_funcs = { |
| qio_channel_websock_source_prepare, |
| qio_channel_websock_source_check, |
| qio_channel_websock_source_dispatch, |
| qio_channel_websock_source_finalize |
| }; |
| |
| static GSource *qio_channel_websock_create_watch(QIOChannel *ioc, |
| GIOCondition condition) |
| { |
| QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc); |
| QIOChannelWebsockSource *ssource; |
| GSource *source; |
| |
| source = g_source_new(&qio_channel_websock_source_funcs, |
| sizeof(QIOChannelWebsockSource)); |
| ssource = (QIOChannelWebsockSource *)source; |
| |
| ssource->wioc = wioc; |
| object_ref(OBJECT(wioc)); |
| |
| ssource->condition = condition; |
| |
| qio_channel_websock_set_watch(wioc); |
| return source; |
| } |
| |
| static void qio_channel_websock_class_init(ObjectClass *klass, |
| void *class_data G_GNUC_UNUSED) |
| { |
| QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass); |
| |
| ioc_klass->io_writev = qio_channel_websock_writev; |
| ioc_klass->io_readv = qio_channel_websock_readv; |
| ioc_klass->io_set_blocking = qio_channel_websock_set_blocking; |
| ioc_klass->io_set_cork = qio_channel_websock_set_cork; |
| ioc_klass->io_set_delay = qio_channel_websock_set_delay; |
| ioc_klass->io_close = qio_channel_websock_close; |
| ioc_klass->io_shutdown = qio_channel_websock_shutdown; |
| ioc_klass->io_create_watch = qio_channel_websock_create_watch; |
| } |
| |
| static const TypeInfo qio_channel_websock_info = { |
| .parent = TYPE_QIO_CHANNEL, |
| .name = TYPE_QIO_CHANNEL_WEBSOCK, |
| .instance_size = sizeof(QIOChannelWebsock), |
| .instance_finalize = qio_channel_websock_finalize, |
| .class_init = qio_channel_websock_class_init, |
| }; |
| |
| static void qio_channel_websock_register_types(void) |
| { |
| type_register_static(&qio_channel_websock_info); |
| } |
| |
| type_init(qio_channel_websock_register_types); |
