| /* |
| Copyright (c) 2012-2013 250bpm s.r.o. All rights reserved. |
| Copyright (c) 2013 GoPivotal, Inc. All rights reserved. |
| Copyright (c) 2014 Wirebird Labs LLC. All rights reserved. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a copy |
| of this software and associated documentation files (the "Software"), |
| to deal in the Software without restriction, including without limitation |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| and/or sell copies of the Software, and to permit persons to whom |
| the Software is furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be included |
| in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| IN THE SOFTWARE. |
| */ |
| |
| #include "ws.h" |
| #include "bws.h" |
| #include "cws.h" |
| #include "sws.h" |
| |
| #include "../../ws.h" |
| |
| #include "../utils/port.h" |
| #include "../utils/iface.h" |
| |
| #include "../../utils/err.h" |
| #include "../../utils/alloc.h" |
| #include "../../utils/fast.h" |
| #include "../../utils/list.h" |
| #include "../../utils/cont.h" |
| |
| #include <string.h> |
| |
| #if defined NN_HAVE_WINDOWS |
| #include "../../utils/win.h" |
| #else |
| #include <unistd.h> |
| #endif |
| |
| /* WebSocket-specific socket options. */ |
| struct nn_ws_optset { |
| struct nn_optset base; |
| int placeholder; |
| }; |
| |
| static void nn_ws_optset_destroy (struct nn_optset *self); |
| static int nn_ws_optset_setopt (struct nn_optset *self, int option, |
| const void *optval, size_t optvallen); |
| static int nn_ws_optset_getopt (struct nn_optset *self, int option, |
| void *optval, size_t *optvallen); |
| static const struct nn_optset_vfptr nn_ws_optset_vfptr = { |
| nn_ws_optset_destroy, |
| nn_ws_optset_setopt, |
| nn_ws_optset_getopt |
| }; |
| |
| /* nn_transport interface. */ |
| static int nn_ws_bind (void *hint, struct nn_epbase **epbase); |
| static int nn_ws_connect (void *hint, struct nn_epbase **epbase); |
| static struct nn_optset *nn_ws_optset (void); |
| |
| static struct nn_transport nn_ws_vfptr = { |
| "ws", |
| NN_WS, |
| NULL, |
| NULL, |
| nn_ws_bind, |
| nn_ws_connect, |
| nn_ws_optset, |
| NN_LIST_ITEM_INITIALIZER |
| }; |
| |
| struct nn_transport *nn_ws = &nn_ws_vfptr; |
| |
| static int nn_ws_bind (void *hint, struct nn_epbase **epbase) |
| { |
| return nn_bws_create (hint, epbase); |
| } |
| |
| static int nn_ws_connect (void *hint, struct nn_epbase **epbase) |
| { |
| return nn_cws_create (hint, epbase); |
| } |
| |
| static struct nn_optset *nn_ws_optset () |
| { |
| struct nn_ws_optset *optset; |
| |
| optset = nn_alloc (sizeof (struct nn_ws_optset), "optset (ws)"); |
| alloc_assert (optset); |
| optset->base.vfptr = &nn_ws_optset_vfptr; |
| |
| /* Default values for WebSocket options. */ |
| optset->placeholder = 1000; |
| |
| return &optset->base; |
| } |
| |
| static void nn_ws_optset_destroy (struct nn_optset *self) |
| { |
| struct nn_ws_optset *optset; |
| |
| optset = nn_cont (self, struct nn_ws_optset, base); |
| nn_free (optset); |
| } |
| |
| static int nn_ws_optset_setopt (struct nn_optset *self, int option, |
| const void *optval, size_t optvallen) |
| { |
| struct nn_ws_optset *optset; |
| |
| optset = nn_cont (self, struct nn_ws_optset, base); |
| |
| switch (option) { |
| case NN_WS_OPTION_PLACEHOLDER: |
| if (optvallen != sizeof (int)) |
| return -EINVAL; |
| optset->placeholder = *(int*) optval; |
| return 0; |
| default: |
| return -ENOPROTOOPT; |
| } |
| } |
| |
| static int nn_ws_optset_getopt (struct nn_optset *self, int option, |
| void *optval, size_t *optvallen) |
| { |
| struct nn_ws_optset *optset; |
| |
| optset = nn_cont (self, struct nn_ws_optset, base); |
| |
| switch (option) { |
| case NN_WS_OPTION_PLACEHOLDER: |
| memcpy (optval, &optset->placeholder, |
| *optvallen < sizeof (int) ? *optvallen : sizeof (int)); |
| *optvallen = sizeof (int); |
| return 0; |
| default: |
| return -ENOPROTOOPT; |
| } |
| } |
| |
| /* Trims the WebSocket header from the message body. */ |
| static int nn_ws_trim_header (struct nn_msghdr *msghdr, uint8_t *ws_hdr) |
| { |
| /* TODO: Rework to more appropriately use msg headers |
| rather than prepending to the message body. */ |
| size_t len; |
| void *chunk; |
| |
| if (msghdr->msg_iovlen <= 0) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| if (msghdr->msg_iov [0].iov_len <= 0) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| if (msghdr->msg_iov [0].iov_len == NN_MSG) { |
| chunk = *(void**) msghdr->msg_iov [0].iov_base; |
| len = nn_chunk_size (chunk); |
| if (len >= sizeof (*ws_hdr)) { |
| *ws_hdr = ((uint8_t *) chunk) [0]; |
| chunk = nn_chunk_trim (chunk, sizeof (*ws_hdr)); |
| *(void**) (msghdr->msg_iov[0].iov_base) = chunk; |
| return sizeof (*ws_hdr); |
| } |
| else { |
| errno = EINVAL; |
| return -1; |
| } |
| } |
| else { |
| /* TODO: copy message into user-supplied buffer. */ |
| nn_assert (0); |
| } |
| } |
| |
| int nn_ws_send (int s, const void *buf, size_t len, uint8_t ws_hdr, int flags) |
| { |
| struct nn_iovec iov; |
| struct nn_msghdr hdr; |
| |
| iov.iov_base = (void*) buf; |
| iov.iov_len = len; |
| |
| hdr.msg_iov = &iov; |
| hdr.msg_iovlen = 1; |
| hdr.msg_control = NULL; |
| hdr.msg_controllen = 0; |
| |
| return nn_ws_sendmsg (s, &hdr, ws_hdr, flags); |
| } |
| |
| int nn_ws_recv (int s, void *buf, size_t len, uint8_t *ws_hdr, int flags) |
| { |
| struct nn_iovec iov; |
| struct nn_msghdr hdr; |
| |
| iov.iov_base = buf; |
| iov.iov_len = len; |
| |
| hdr.msg_iov = &iov; |
| hdr.msg_iovlen = 1; |
| hdr.msg_control = NULL; |
| hdr.msg_controllen = 0; |
| |
| return nn_ws_recvmsg (s, &hdr, ws_hdr, flags); |
| } |
| |
| int nn_ws_sendmsg (int s, const struct nn_msghdr *msghdr, uint8_t ws_hdr, |
| int flags) |
| { |
| int rc; |
| void *orig_buf; |
| size_t orig_len; |
| size_t added_len; |
| uint8_t *new_chunk_buf; |
| |
| if (msghdr->msg_iovlen <= 0) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| added_len = sizeof (ws_hdr); |
| |
| orig_buf = *((void**) msghdr->msg_iov[0].iov_base); |
| orig_len = nn_chunk_size (orig_buf); |
| rc = nn_chunk_alloc (orig_len + added_len, 0, (void**) &new_chunk_buf); |
| if (rc != 0) |
| return rc; |
| |
| /* Assume this is not a continuation frame; if, in the future the library |
| expands to support continuation frames, perhaps NN_SNDMORE is passed |
| into "flags" which would not set the FIN bit. */ |
| new_chunk_buf [0] = ws_hdr | NN_SWS_FRAME_BITMASK_FIN; |
| |
| memcpy (&new_chunk_buf [1], orig_buf, orig_len); |
| |
| *(void**) (msghdr->msg_iov [0].iov_base) = new_chunk_buf; |
| |
| nn_chunk_free (orig_buf); |
| |
| rc = nn_sendmsg (s, msghdr, flags); |
| |
| if (rc < 0) { |
| return rc; |
| } |
| else if (rc == 0) { |
| /* Impossible, since we just added data to the message. */ |
| nn_assert (0); |
| } |
| else { |
| return (rc - added_len); |
| } |
| } |
| |
| int nn_ws_recvmsg (int s, struct nn_msghdr *msghdr, uint8_t *ws_hdr, int flags) |
| { |
| int rc; |
| int rc_trim; |
| |
| rc = nn_recvmsg (s, msghdr, flags); |
| if (rc < 0) |
| return rc; |
| |
| rc_trim = nn_ws_trim_header (msghdr, ws_hdr); |
| |
| /* The library should always reassemble fragmented messages from |
| remote endpoint. */ |
| nn_assert (*ws_hdr & NN_SWS_FRAME_BITMASK_FIN); |
| |
| /* Return only the message type. */ |
| if (*ws_hdr == (NN_WS_MSG_TYPE_GONE | NN_SWS_FRAME_BITMASK_FIN)) |
| *ws_hdr = NN_WS_MSG_TYPE_GONE; |
| else |
| *ws_hdr &= NN_SWS_FRAME_BITMASK_OPCODE; |
| |
| if (rc_trim < 0) |
| return rc_trim; |
| else |
| return rc - rc_trim; |
| } |