1 /*
2 * libwebsockets - small server side websockets and web server implementation
3 *
4 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25 #include <private-lib-core.h>
26
27 static int
rops_handle_POLLIN_raw_proxy(struct lws_context_per_thread * pt,struct lws * wsi,struct lws_pollfd * pollfd)28 rops_handle_POLLIN_raw_proxy(struct lws_context_per_thread *pt, struct lws *wsi,
29 struct lws_pollfd *pollfd)
30 {
31 struct lws_tokens ebuf;
32 int n, buffered;
33
34 /* pending truncated sends have uber priority */
35
36 if (lws_has_buffered_out(wsi)) {
37 if (!(pollfd->revents & LWS_POLLOUT))
38 return LWS_HPI_RET_HANDLED;
39
40 /* drain the output buflist */
41 if (lws_issue_raw(wsi, NULL, 0) < 0)
42 goto fail;
43 /*
44 * we can't afford to allow input processing to send
45 * something new, so spin around he event loop until
46 * he doesn't have any partials
47 */
48 return LWS_HPI_RET_HANDLED;
49 }
50
51 if ((pollfd->revents & pollfd->events & LWS_POLLIN) &&
52 /* any tunnel has to have been established... */
53 lwsi_state(wsi) != LRS_SSL_ACK_PENDING &&
54 !(wsi->favoured_pollin &&
55 (pollfd->revents & pollfd->events & LWS_POLLOUT))) {
56
57 ebuf.token = NULL;
58 ebuf.len = 0;
59 buffered = lws_buflist_aware_read(pt, wsi, &ebuf, 1, __func__);
60 if (buffered < 0)
61 goto fail;
62
63 switch (ebuf.len) {
64 case 0:
65 lwsl_info("%s: read 0 len\n", __func__);
66 wsi->seen_zero_length_recv = 1;
67 if (lws_change_pollfd(wsi, LWS_POLLIN, 0))
68 goto fail;
69
70 /*
71 * we need to go to fail here, since it's the only
72 * chance we get to understand that the socket has
73 * closed
74 */
75 // goto try_pollout;
76 goto fail;
77
78 case LWS_SSL_CAPABLE_ERROR:
79 goto fail;
80 case LWS_SSL_CAPABLE_MORE_SERVICE:
81 goto try_pollout;
82 }
83 n = user_callback_handle_rxflow(wsi->protocol->callback,
84 wsi, lwsi_role_client(wsi) ?
85 LWS_CALLBACK_RAW_PROXY_CLI_RX :
86 LWS_CALLBACK_RAW_PROXY_SRV_RX,
87 wsi->user_space, ebuf.token,
88 ebuf.len);
89 if (n < 0) {
90 lwsl_info("LWS_CALLBACK_RAW_PROXY_*_RX fail\n");
91 goto fail;
92 }
93
94 if (lws_buflist_aware_finished_consuming(wsi, &ebuf, ebuf.len,
95 buffered, __func__))
96 return LWS_HPI_RET_PLEASE_CLOSE_ME;
97 } else
98 if (wsi->favoured_pollin &&
99 (pollfd->revents & pollfd->events & LWS_POLLOUT))
100 /* we balanced the last favouring of pollin */
101 wsi->favoured_pollin = 0;
102
103 try_pollout:
104
105 if (!(pollfd->revents & LWS_POLLOUT))
106 return LWS_HPI_RET_HANDLED;
107
108 if (lws_handle_POLLOUT_event(wsi, pollfd)) {
109 lwsl_debug("POLLOUT event closed it\n");
110 return LWS_HPI_RET_PLEASE_CLOSE_ME;
111 }
112
113 #if defined(LWS_WITH_CLIENT)
114 if (lws_client_socket_service(wsi, pollfd))
115 return LWS_HPI_RET_WSI_ALREADY_DIED;
116 #endif
117
118 return LWS_HPI_RET_HANDLED;
119
120 fail:
121 lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS, "raw svc fail");
122
123 return LWS_HPI_RET_WSI_ALREADY_DIED;
124 }
125
126 static int
rops_adoption_bind_raw_proxy(struct lws * wsi,int type,const char * vh_prot_name)127 rops_adoption_bind_raw_proxy(struct lws *wsi, int type,
128 const char *vh_prot_name)
129 {
130 /* no http but socket... must be raw skt */
131 if ((type & LWS_ADOPT_HTTP) || !(type & LWS_ADOPT_SOCKET) ||
132 (!(type & LWS_ADOPT_FLAG_RAW_PROXY)) || (type & _LWS_ADOPT_FINISH))
133 return 0; /* no match */
134
135 #if defined(LWS_WITH_UDP)
136 if (type & LWS_ADOPT_FLAG_UDP)
137 /*
138 * these can be >128 bytes, so just alloc for UDP
139 */
140 wsi->udp = lws_malloc(sizeof(*wsi->udp), "udp struct");
141 #endif
142
143 lws_role_transition(wsi, LWSIFR_SERVER, (type & LWS_ADOPT_ALLOW_SSL) ?
144 LRS_SSL_INIT : LRS_ESTABLISHED,
145 &role_ops_raw_proxy);
146
147 if (vh_prot_name)
148 lws_bind_protocol(wsi, wsi->protocol, __func__);
149 else
150 /* this is the only time he will transition */
151 lws_bind_protocol(wsi,
152 &wsi->vhost->protocols[wsi->vhost->raw_protocol_index],
153 __func__);
154
155 return 1; /* bound */
156 }
157
158 static int
rops_client_bind_raw_proxy(struct lws * wsi,const struct lws_client_connect_info * i)159 rops_client_bind_raw_proxy(struct lws *wsi,
160 const struct lws_client_connect_info *i)
161 {
162 if (!i) {
163
164 /* finalize */
165
166 if (!wsi->user_space && wsi->stash->cis[CIS_METHOD])
167 if (lws_ensure_user_space(wsi))
168 return 1;
169
170 return 0;
171 }
172
173 /* we are a fallback if nothing else matched */
174
175 if (i->local_protocol_name && !strcmp(i->local_protocol_name, "raw-proxy"))
176 lws_role_transition(wsi, LWSIFR_CLIENT, LRS_UNCONNECTED,
177 &role_ops_raw_proxy);
178
179 return 0;
180 }
181
182 static int
rops_handle_POLLOUT_raw_proxy(struct lws * wsi)183 rops_handle_POLLOUT_raw_proxy(struct lws *wsi)
184 {
185 if (lwsi_state(wsi) == LRS_ESTABLISHED)
186 return LWS_HP_RET_USER_SERVICE;
187
188 if (lwsi_role_client(wsi))
189 return LWS_HP_RET_USER_SERVICE;
190
191 return LWS_HP_RET_BAIL_OK;
192 }
193
194 const struct lws_role_ops role_ops_raw_proxy = {
195 /* role name */ "raw-proxy",
196 /* alpn id */ NULL,
197 /* check_upgrades */ NULL,
198 /* pt_init_destroy */ NULL,
199 /* init_vhost */ NULL,
200 /* destroy_vhost */ NULL,
201 /* service_flag_pending */ NULL,
202 /* handle_POLLIN */ rops_handle_POLLIN_raw_proxy,
203 /* handle_POLLOUT */ rops_handle_POLLOUT_raw_proxy,
204 /* perform_user_POLLOUT */ NULL,
205 /* callback_on_writable */ NULL,
206 /* tx_credit */ NULL,
207 /* write_role_protocol */ NULL,
208 /* encapsulation_parent */ NULL,
209 /* alpn_negotiated */ NULL,
210 /* close_via_role_protocol */ NULL,
211 /* close_role */ NULL,
212 /* close_kill_connection */ NULL,
213 /* destroy_role */ NULL,
214 /* adoption_bind */ rops_adoption_bind_raw_proxy,
215 /* client_bind */ rops_client_bind_raw_proxy,
216 /* issue_keepalive */ NULL,
217 /* adoption_cb clnt, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_ADOPT,
218 LWS_CALLBACK_RAW_PROXY_SRV_ADOPT },
219 /* rx_cb clnt, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_RX,
220 LWS_CALLBACK_RAW_PROXY_SRV_RX },
221 /* writeable cb clnt, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_WRITEABLE,
222 LWS_CALLBACK_RAW_PROXY_SRV_WRITEABLE, },
223 /* close cb clnt, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_CLOSE,
224 LWS_CALLBACK_RAW_PROXY_SRV_CLOSE },
225 /* protocol_bind cb c, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_BIND_PROTOCOL,
226 LWS_CALLBACK_RAW_PROXY_SRV_BIND_PROTOCOL },
227 /* protocol_unbind cb c, srv */ { LWS_CALLBACK_RAW_PROXY_CLI_DROP_PROTOCOL,
228 LWS_CALLBACK_RAW_PROXY_SRV_DROP_PROTOCOL },
229 /* file_handle */ 0,
230 };
231