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1 #ifndef HEADER_CURL_MULTIHANDLE_H
2 #define HEADER_CURL_MULTIHANDLE_H
3 /***************************************************************************
4  *                                  _   _ ____  _
5  *  Project                     ___| | | |  _ \| |
6  *                             / __| | | | |_) | |
7  *                            | (__| |_| |  _ <| |___
8  *                             \___|\___/|_| \_\_____|
9  *
10  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
11  *
12  * This software is licensed as described in the file COPYING, which
13  * you should have received as part of this distribution. The terms
14  * are also available at https://curl.haxx.se/docs/copyright.html.
15  *
16  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
17  * copies of the Software, and permit persons to whom the Software is
18  * furnished to do so, under the terms of the COPYING file.
19  *
20  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21  * KIND, either express or implied.
22  *
23  ***************************************************************************/
24 
25 #include "conncache.h"
26 #include "psl.h"
27 
28 struct Curl_message {
29   struct curl_llist_element list;
30   /* the 'CURLMsg' is the part that is visible to the external user */
31   struct CURLMsg extmsg;
32 };
33 
34 /* NOTE: if you add a state here, add the name to the statename[] array as
35    well!
36 */
37 typedef enum {
38   CURLM_STATE_INIT,         /* 0 - start in this state */
39   CURLM_STATE_CONNECT_PEND, /* 1 - no connections, waiting for one */
40   CURLM_STATE_CONNECT,      /* 2 - resolve/connect has been sent off */
41   CURLM_STATE_WAITRESOLVE,  /* 3 - awaiting the resolve to finalize */
42   CURLM_STATE_WAITCONNECT,  /* 4 - awaiting the TCP connect to finalize */
43   CURLM_STATE_WAITPROXYCONNECT, /* 5 - awaiting HTTPS proxy SSL initialization
44                                    to complete and/or proxy CONNECT to
45                                    finalize */
46   CURLM_STATE_SENDPROTOCONNECT, /* 6 - initiate protocol connect procedure */
47   CURLM_STATE_PROTOCONNECT, /* 7 - completing the protocol-specific connect
48                                    phase */
49   CURLM_STATE_DO,           /* 8 - start send off the request (part 1) */
50   CURLM_STATE_DOING,        /* 9 - sending off the request (part 1) */
51   CURLM_STATE_DO_MORE,      /* 10 - send off the request (part 2) */
52   CURLM_STATE_DO_DONE,      /* 11 - done sending off request */
53   CURLM_STATE_PERFORM,      /* 12 - transfer data */
54   CURLM_STATE_TOOFAST,      /* 13 - wait because limit-rate exceeded */
55   CURLM_STATE_DONE,         /* 14 - post data transfer operation */
56   CURLM_STATE_COMPLETED,    /* 15 - operation complete */
57   CURLM_STATE_MSGSENT,      /* 16 - the operation complete message is sent */
58   CURLM_STATE_LAST          /* 17 - not a true state, never use this */
59 } CURLMstate;
60 
61 /* we support N sockets per easy handle. Set the corresponding bit to what
62    action we should wait for */
63 #define MAX_SOCKSPEREASYHANDLE 5
64 #define GETSOCK_READABLE (0x00ff)
65 #define GETSOCK_WRITABLE (0xff00)
66 
67 #define CURLPIPE_ANY (CURLPIPE_MULTIPLEX)
68 
69 /* This is the struct known as CURLM on the outside */
70 struct Curl_multi {
71   /* First a simple identifier to easier detect if a user mix up
72      this multi handle with an easy handle. Set this to CURL_MULTI_HANDLE. */
73   long type;
74 
75   /* We have a doubly-linked circular list with easy handles */
76   struct Curl_easy *easyp;
77   struct Curl_easy *easylp; /* last node */
78 
79   int num_easy; /* amount of entries in the linked list above. */
80   int num_alive; /* amount of easy handles that are added but have not yet
81                     reached COMPLETE state */
82 
83   struct curl_llist msglist; /* a list of messages from completed transfers */
84 
85   struct curl_llist pending; /* Curl_easys that are in the
86                                 CURLM_STATE_CONNECT_PEND state */
87 
88   /* callback function and user data pointer for the *socket() API */
89   curl_socket_callback socket_cb;
90   void *socket_userp;
91 
92   /* callback function and user data pointer for server push */
93   curl_push_callback push_cb;
94   void *push_userp;
95 
96   /* Hostname cache */
97   struct curl_hash hostcache;
98 
99 #ifdef USE_LIBPSL
100   /* PSL cache. */
101   struct PslCache psl;
102 #endif
103 
104   /* timetree points to the splay-tree of time nodes to figure out expire
105      times of all currently set timers */
106   struct Curl_tree *timetree;
107 
108   /* 'sockhash' is the lookup hash for socket descriptor => easy handles (note
109      the pluralis form, there can be more than one easy handle waiting on the
110      same actual socket) */
111   struct curl_hash sockhash;
112 
113   /* multiplexing wanted */
114   bool multiplexing;
115 
116   bool recheckstate; /* see Curl_multi_connchanged */
117 
118   /* Shared connection cache (bundles)*/
119   struct conncache conn_cache;
120 
121   long maxconnects; /* if >0, a fixed limit of the maximum number of entries
122                        we're allowed to grow the connection cache to */
123 
124   long max_host_connections; /* if >0, a fixed limit of the maximum number
125                                 of connections per host */
126 
127   long max_total_connections; /* if >0, a fixed limit of the maximum number
128                                  of connections in total */
129 
130   /* timer callback and user data pointer for the *socket() API */
131   curl_multi_timer_callback timer_cb;
132   void *timer_userp;
133   struct curltime timer_lastcall; /* the fixed time for the timeout for the
134                                     previous callback */
135   bool in_callback;            /* true while executing a callback */
136   long max_concurrent_streams; /* max concurrent streams client to support */
137 };
138 
139 #endif /* HEADER_CURL_MULTIHANDLE_H */
140