static void websocket_perform_handshake(full_subscriber_t *fsub) { static ngx_str_t magic = ngx_string("258EAFA5-E914-47DA-95CA-C5AB0DC85B11"); ngx_str_t ws_accept_key, sha1_str; u_char buf_sha1[21]; u_char buf[255]; ngx_str_t *tmp, *ws_key; ngx_int_t ws_version; ngx_http_request_t *r = fsub->sub.request; ngx_sha1_t sha1; ws_accept_key.data = buf; r->headers_out.content_length_n = 0; r->header_only = 1; if((tmp = nchan_get_header_value(r, NCHAN_HEADER_SEC_WEBSOCKET_VERSION)) == NULL) { r->headers_out.status = NGX_HTTP_BAD_REQUEST; fsub->sub.dequeue_after_response=1; } else { ws_version=ngx_atoi(tmp->data, tmp->len); if(ws_version != 13) { r->headers_out.status = NGX_HTTP_BAD_REQUEST; fsub->sub.dequeue_after_response=1; } } if((ws_key = nchan_get_header_value(r, NCHAN_HEADER_SEC_WEBSOCKET_KEY)) == NULL) { r->headers_out.status = NGX_HTTP_BAD_REQUEST; fsub->sub.dequeue_after_response=1; } if(r->headers_out.status != NGX_HTTP_BAD_REQUEST) { //generate accept key ngx_sha1_init(&sha1); ngx_sha1_update(&sha1, ws_key->data, ws_key->len); ngx_sha1_update(&sha1, magic.data, magic.len); ngx_sha1_final(buf_sha1, &sha1); sha1_str.len=20; sha1_str.data=buf_sha1; ws_accept_key.len=ngx_base64_encoded_length(sha1_str.len); assert(ws_accept_key.len < 255); ngx_encode_base64(&ws_accept_key, &sha1_str); nchan_include_access_control_if_needed(r, fsub->ctx); nchan_add_response_header(r, &NCHAN_HEADER_SEC_WEBSOCKET_ACCEPT, &ws_accept_key); nchan_add_response_header(r, &NCHAN_HEADER_UPGRADE, &NCHAN_WEBSOCKET); #if nginx_version < 1003013 nchan_add_response_header(r, &NCHAN_HEADER_CONNECTION, &NCHAN_UPGRADE); #endif r->headers_out.status_line = NCHAN_HTTP_STATUS_101; r->headers_out.status = NGX_HTTP_SWITCHING_PROTOCOLS; r->keepalive=0; //apparently, websocket must not use keepalive. } ngx_http_send_header(r); }
ngx_int_t nchan_respond_string(ngx_http_request_t *r, ngx_int_t status_code, const ngx_str_t *content_type, const ngx_str_t *body, ngx_int_t finalize) { ngx_int_t rc = NGX_OK; ngx_buf_t *b = REQUEST_PCALLOC(r, b); ngx_chain_t *chain = REQUEST_PALLOC(r, chain); //assume both were alloc'd fine r->headers_out.status=status_code; r->headers_out.content_length_n = body->len; if(content_type) { r->headers_out.content_type.len = content_type->len; r->headers_out.content_type.data = content_type->data; } nchan_include_access_control_if_needed(r, NULL); if ((!b) || (!chain)) { ERR("Couldn't allocate ngx buf or chain."); r->headers_out.status=NGX_HTTP_INTERNAL_SERVER_ERROR; r->headers_out.content_length_n = 0; r->header_only = 1; ngx_http_send_header(r); rc=NGX_ERROR; } else { chain->buf=b; chain->next=NULL; b->last_buf = 1; b->last_in_chain = 1; b->flush = 1; //flush just to be sure, although I should perhaps rethink this b->memory = 1; b->start = body->data; b->pos = body->data; b->end = body->data + body->len; b->last = b->end; if ((rc = ngx_http_send_header(r)) == NGX_OK) { rc= nchan_output_filter(r, chain); } } if(finalize) { nchan_http_finalize_request(r, rc); } return rc; }
ngx_int_t nchan_respond_status(ngx_http_request_t *r, ngx_int_t status_code, const ngx_str_t *status_line, ngx_int_t finalize) { ngx_int_t rc = NGX_OK; r->headers_out.status=status_code; if(status_line!=NULL) { r->headers_out.status_line.len =status_line->len; r->headers_out.status_line.data=status_line->data; } r->headers_out.content_length_n = 0; r->header_only = 1; nchan_include_access_control_if_needed(r, NULL); rc= ngx_http_send_header(r); if(finalize) { ngx_http_finalize_request(r, rc); } return rc; }
ngx_int_t nchan_cleverly_output_headers_only_for_later_response(ngx_http_request_t *r) { ngx_int_t rc; static const ngx_str_t everything_ok = ngx_string("200 OK"); r->headers_out.status_line = everything_ok; //but in reality, we're returning a 200 OK #if (NGX_HTTP_V2) if(r->stream) { r->headers_out.status=NGX_HTTP_OK; //no need to fool chunking module r->header_only = 0; } else { r->headers_out.status=NGX_HTTP_NO_CONTENT; //fake it to fool the chunking module (mostly); r->header_only = 1; } #elif (NGX_HTTP_SPDY) if(r->spdy_stream) { r->headers_out.status=NGX_HTTP_OK; //no need to fool chunking module r->header_only = 0; } else { r->headers_out.status=NGX_HTTP_NO_CONTENT; //fake it to fool the chunking module (mostly); r->header_only = 1; } #else r->headers_out.status=NGX_HTTP_NO_CONTENT; //fake it to fool the chunking module (mostly); r->header_only = 1; #endif nchan_include_access_control_if_needed(r, NULL); rc = ngx_http_send_header(r); if(r->headers_out.status == NGX_HTTP_OK) { r->keepalive = 1; } return rc; }
ngx_int_t nchan_respond_msg(ngx_http_request_t *r, nchan_msg_t *msg, nchan_msg_id_t *msgid, ngx_int_t finalize, char **err) { ngx_buf_t *buffer = &msg->buf; nchan_buf_and_chain_t *cb; ngx_int_t rc; ngx_chain_t *rchain = NULL; ngx_buf_t *rbuffer; nchan_request_ctx_t *ctx = ngx_http_get_module_ctx(r, ngx_nchan_module); if(ngx_buf_size(buffer) > 0) { cb = ngx_palloc(r->pool, sizeof(*cb)); if (!cb) { if(err) *err = "couldn't allocate memory for buf-and-chain while responding with msg"; return NGX_ERROR; } rchain = &cb->chain; rbuffer = &cb->buf; rchain->next = NULL; rchain->buf = rbuffer; ngx_memcpy(rbuffer, buffer, sizeof(*buffer)); nchan_msg_buf_open_fd_if_needed(rbuffer, NULL, r); r->headers_out.content_length_n=ngx_buf_size(rbuffer); } else { r->headers_out.content_length_n = 0; r->header_only = 1; } if (msg->content_type) { r->headers_out.content_type = *msg->content_type; } if(msgid == NULL) { msgid = &msg->id; } if(nchan_set_msgid_http_response_headers(r, ctx, msgid) != NGX_OK) { if(err) *err = "can't set msgid headers"; return NGX_ERROR; } r->headers_out.status=NGX_HTTP_OK; nchan_include_access_control_if_needed(r, ctx); //we know the entity length, and we're using just one buffer. so no chunking please. if((rc = ngx_http_send_header(r)) >= NGX_HTTP_SPECIAL_RESPONSE) { ERR("request %p, send_header response %i", r, rc); if(err) *err="WTF just happened to request?"; return NGX_ERROR; } if(rchain) { rc= nchan_output_filter(r, rchain); if(rc != NGX_OK && err) *err="failed to write data to connection socket, probably because the connection got closed"; } if(finalize) { nchan_http_finalize_request(r, rc); } return rc; }
static ngx_int_t longpoll_multipart_respond(full_subscriber_t *fsub) { ngx_http_request_t *r = fsub->sub.request; nchan_request_ctx_t *ctx = ngx_http_get_module_ctx(r, ngx_nchan_module); char *err; ngx_int_t rc; u_char *char_boundary = NULL; u_char *char_boundary_last; ngx_buf_t boundary[3]; //first, mid, and last boundary ngx_buf_t newline_buf; ngx_chain_t *chain, *first_chain = NULL, *last_chain = NULL; ngx_buf_t *buf; ngx_buf_t double_newline_buf; ngx_str_t *content_type; size_t size = 0; nchan_loc_conf_t *cf = fsub->sub.cf; int use_raw_stream_separator = cf->longpoll_multimsg_use_raw_stream_separator; nchan_buf_and_chain_t *bc; nchan_longpoll_multimsg_t *first, *cur; //disable abort handler fsub->data.cln->handler = empty_handler; first = fsub->data.multimsg_first; fsub->sub.dequeue_after_response = 1; //cleanup to release msgs fsub->data.cln = ngx_http_cleanup_add(fsub->sub.request, 0); fsub->data.cln->data = first; fsub->data.cln->handler = (ngx_http_cleanup_pt )multipart_request_cleanup_handler; if(fsub->data.multimsg_first == fsub->data.multimsg_last) { //just one message. if((rc = nchan_respond_msg(r, fsub->data.multimsg_first->msg, &fsub->sub.last_msgid, 0, &err)) != NGX_OK) { return abort_response(&fsub->sub, err); } return NGX_OK; } //multi messages if(!use_raw_stream_separator) { nchan_request_set_content_type_multipart_boundary_header(r, ctx); char_boundary = ngx_palloc(r->pool, 50); char_boundary_last = ngx_snprintf(char_boundary, 50, ("\r\n--%V--\r\n"), nchan_request_multipart_boundary(r, ctx)); ngx_init_set_membuf_char(&double_newline_buf, "\r\n\r\n"); //set up the boundaries ngx_init_set_membuf(&boundary[0], &char_boundary[2], &char_boundary_last[-4]); ngx_init_set_membuf(&boundary[1], &char_boundary[0], &char_boundary_last[-4]); ngx_init_set_membuf(&boundary[2], &char_boundary[0], char_boundary_last); ngx_init_set_membuf_char(&newline_buf, "\n"); } int n=0; for(cur = first; cur != NULL; cur = cur->next) { bc = nchan_bufchain_pool_reserve(ctx->bcp, 4); chain = &bc->chain; n++; if(last_chain) { last_chain->next = chain; } if(!first_chain) { first_chain = chain; } if(!use_raw_stream_separator) { // each buffer needs to be unique for the purpose of dealing with nginx output guts // (something about max. 64 iovecs per write call and counting the number of bytes already sent) *chain->buf = cur == first ? boundary[0] : boundary[1]; size += ngx_buf_size((chain->buf)); chain = chain->next; content_type = &cur->msg->content_type; buf = chain->buf; if (content_type->data != NULL) { u_char *char_cur = ngx_pcalloc(r->pool, content_type->len + 25); ngx_init_set_membuf(buf, char_cur, ngx_snprintf(char_cur, content_type->len + 25, "\r\nContent-Type: %V\r\n\r\n", content_type)); } else { *buf = double_newline_buf; } size += ngx_buf_size(buf); chain = chain->next; } if(ngx_buf_size(cur->msg->buf) > 0) { buf = chain->buf; *buf = *cur->msg->buf; if(buf->file) { ngx_file_t *file_copy = nchan_bufchain_pool_reserve_file(ctx->bcp); nchan_msg_buf_open_fd_if_needed(buf, file_copy, NULL); } buf->last_buf = 0; size += ngx_buf_size(buf); } if(use_raw_stream_separator) { chain = chain->next; ngx_init_set_membuf_str(chain->buf, &cf->subscriber_http_raw_stream_separator); size += ngx_buf_size((chain->buf)); } else { if(cur->next == NULL) { chain = chain->next; chain->buf = &boundary[2]; size += ngx_buf_size((chain->buf)); } } last_chain = chain; } buf = last_chain->buf; buf->last_buf = 1; buf->last_in_chain = 1; buf->flush = 1; last_chain->next = NULL; r->headers_out.status = NGX_HTTP_OK; r->headers_out.content_length_n = size; nchan_set_msgid_http_response_headers(r, ctx, &fsub->data.multimsg_last->msg->id); nchan_include_access_control_if_needed(r, ctx); ngx_http_send_header(r); nchan_output_filter(r, first_chain); return NGX_OK; }
static ngx_int_t longpoll_multipart_respond(full_subscriber_t *fsub) { ngx_http_request_t *r = fsub->sub.request; nchan_request_ctx_t *ctx = ngx_http_get_module_ctx(r, nchan_module); char *err; ngx_int_t rc; u_char char_boundary[50]; u_char *char_boundary_last; ngx_int_t i; ngx_buf_t boundary[3]; //first, mid, and last boundary ngx_chain_t *chains, *first_chain = NULL, *last_chain = NULL; ngx_buf_t *buf; ngx_buf_t double_newline_buf; ngx_str_t *content_type; size_t size = 0; nchan_longpoll_multimsg_t *first, *cur; //disable abort handler fsub->data.cln->handler = empty_handler; first = fsub->data.multimsg_first; fsub->sub.dequeue_after_response = 1; //cleanup to release msgs fsub->data.cln = ngx_http_cleanup_add(fsub->sub.request, 0); fsub->data.cln->data = first; fsub->data.cln->handler = (ngx_http_cleanup_pt )multipart_request_cleanup_handler; if(fsub->data.multimsg_first == fsub->data.multimsg_last) { //just one message. if((rc = nchan_respond_msg(r, fsub->data.multimsg_first->msg, &fsub->sub.last_msgid, 0, &err)) != NGX_OK) { return abort_response(&fsub->sub, err); } return NGX_OK; } //multi messages nchan_request_set_content_type_multipart_boundary_header(r, ctx); char_boundary_last = ngx_snprintf(char_boundary, 50, ("\r\n--%V--\r\n"), nchan_request_multipart_boundary(r, ctx)); ngx_memzero(&double_newline_buf, sizeof(double_newline_buf)); double_newline_buf.start = (u_char *)"\r\n\r\n"; double_newline_buf.end = double_newline_buf.start + 4; double_newline_buf.pos = double_newline_buf.start; double_newline_buf.last = double_newline_buf.end; double_newline_buf.memory = 1; //set up the boundaries for(i=0; i<3; i++) { ngx_memzero(&boundary[i], sizeof(ngx_buf_t)); boundary[i].memory = 1; if(i==0) { boundary[i].start = &char_boundary[2]; boundary[i].end = &char_boundary_last[-4]; } else if(i==1) { boundary[i].start = &char_boundary[0]; boundary[i].end = &char_boundary_last[-4]; } else if(i==2) { boundary[i].start = &char_boundary[0]; boundary[i].end = char_boundary_last; boundary[i].last_buf = 1; boundary[i].last_in_chain = 1; boundary[i].flush = 1; } boundary[i].pos = boundary[i].start; boundary[i].last = boundary[i].end; } int n=0; for(cur = first; cur != NULL; cur = cur->next) { chains = ngx_palloc(r->pool, sizeof(*chains)*4); n++; if(last_chain) { last_chain->next = &chains[0]; } if(!first_chain) { first_chain = &chains[0]; } // each buffer needs to be unique for the purpose of dealing with nginx output guts // (something about max. 64 iovecs per write call and counting the number of bytes already sent) buf = ngx_pcalloc(r->pool, sizeof(*buf)); *buf = cur == first ? boundary[0] : boundary[1]; chains[0].buf = buf; chains[0].next = &chains[1]; size += ngx_buf_size(chains[0].buf); content_type = &cur->msg->content_type; if (content_type->data != NULL) { buf = ngx_pcalloc(r->pool, sizeof(*buf) + content_type->len + 25); buf->memory = 1; buf->start = (u_char *)&buf[1]; buf->end = ngx_snprintf(buf->start, content_type->len + 25, "\r\nContent-Type: %V\r\n\r\n", content_type); buf->pos = buf->start; buf->last = buf->end; chains[1].buf = buf; } else { buf = ngx_palloc(r->pool, sizeof(*buf)); chains[1].buf = buf; *buf = double_newline_buf; } size += ngx_buf_size(chains[1].buf); if(ngx_buf_size(cur->msg->buf) > 0) { chains[1].next = &chains[2]; buf = ngx_palloc(r->pool, sizeof(*buf)); *buf = *cur->msg->buf; nchan_msg_buf_open_fd_if_needed(buf, NULL, r); buf->last_buf = 0; chains[2].buf = buf; size += ngx_buf_size(chains[2].buf); last_chain = &chains[2]; } else { last_chain = &chains[1]; } if(cur->next == NULL) { last_chain->next = &chains[3]; chains[3].buf = &boundary[2]; chains[3].next = NULL; last_chain = &chains[3]; size += ngx_buf_size(chains[3].buf); } } r->headers_out.status = NGX_HTTP_OK; r->headers_out.content_length_n = size; nchan_set_msgid_http_response_headers(r, ctx, &fsub->data.multimsg_last->msg->id); nchan_include_access_control_if_needed(r, ctx); ngx_http_send_header(r); nchan_output_filter(r, first_chain); return NGX_OK; }