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#ifndef HEADER_CURL_MULTIHANDLE_H
#define HEADER_CURL_MULTIHANDLE_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "llist.h"
#include "hash.h"
#include "conncache.h"
#include "psl.h"
#include "socketpair.h"
struct connectdata;
struct Curl_message {
struct Curl_llist_node list;
/* the 'CURLMsg' is the part that is visible to the external user */
struct CURLMsg extmsg;
};
/* NOTE: if you add a state here, add the name to the statename[] array as
well!
*/
typedef enum {
MSTATE_INIT, /* 0 - start in this state */
MSTATE_PENDING, /* 1 - no connections, waiting for one */
MSTATE_SETUP, /* 2 - start a new transfer */
MSTATE_CONNECT, /* 3 - resolve/connect has been sent off */
MSTATE_RESOLVING, /* 4 - awaiting the resolve to finalize */
MSTATE_CONNECTING, /* 5 - awaiting the TCP connect to finalize */
MSTATE_TUNNELING, /* 6 - awaiting HTTPS proxy SSL initialization to
complete and/or proxy CONNECT to finalize */
MSTATE_PROTOCONNECT, /* 7 - initiate protocol connect procedure */
MSTATE_PROTOCONNECTING, /* 8 - completing the protocol-specific connect
phase */
MSTATE_DO, /* 9 - start send off the request (part 1) */
MSTATE_DOING, /* 10 - sending off the request (part 1) */
MSTATE_DOING_MORE, /* 11 - send off the request (part 2) */
MSTATE_DID, /* 12 - done sending off request */
MSTATE_PERFORMING, /* 13 - transfer data */
MSTATE_RATELIMITING, /* 14 - wait because limit-rate exceeded */
MSTATE_DONE, /* 15 - post data transfer operation */
MSTATE_COMPLETED, /* 16 - operation complete */
MSTATE_MSGSENT, /* 17 - the operation complete message is sent */
MSTATE_LAST /* 18 - not a true state, never use this */
} CURLMstate;
/* we support N sockets per easy handle. Set the corresponding bit to what
action we should wait for */
#define MAX_SOCKSPEREASYHANDLE 5
#define GETSOCK_READABLE (0x00ff)
#define GETSOCK_WRITABLE (0xff00)
#define CURLPIPE_ANY (CURLPIPE_MULTIPLEX)
#if !defined(CURL_DISABLE_SOCKETPAIR)
#define ENABLE_WAKEUP
#endif
/* value for MAXIMUM CONCURRENT STREAMS upper limit */
#define INITIAL_MAX_CONCURRENT_STREAMS ((1U << 31) - 1)
/* This is the struct known as CURLM on the outside */
struct Curl_multi {
/* First a simple identifier to easier detect if a user mix up
this multi handle with an easy handle. Set this to CURL_MULTI_HANDLE. */
unsigned int magic;
unsigned int num_easy; /* amount of entries in the linked list above. */
unsigned int num_alive; /* amount of easy handles that are added but have
not yet reached COMPLETE state */
struct Curl_llist msglist; /* a list of messages from completed transfers */
/* Each added easy handle is added to ONE of these three lists */
struct Curl_llist process; /* not in PENDING or MSGSENT */
struct Curl_llist pending; /* in PENDING */
struct Curl_llist msgsent; /* in MSGSENT */
curl_off_t next_easy_mid; /* next multi-id for easy handle added */
/* callback function and user data pointer for the *socket() API */
curl_socket_callback socket_cb;
void *socket_userp;
/* callback function and user data pointer for server push */
curl_push_callback push_cb;
void *push_userp;
/* Hostname cache */
struct Curl_hash hostcache;
#ifdef USE_LIBPSL
/* PSL cache. */
struct PslCache psl;
#endif
/* timetree points to the splay-tree of time nodes to figure out expire
times of all currently set timers */
struct Curl_tree *timetree;
/* buffer used for transfer data, lazy initialized */
char *xfer_buf; /* the actual buffer */
size_t xfer_buf_len; /* the allocated length */
/* buffer used for upload data, lazy initialized */
char *xfer_ulbuf; /* the actual buffer */
size_t xfer_ulbuf_len; /* the allocated length */
/* 'sockhash' is the lookup hash for socket descriptor => easy handles (note
the pluralis form, there can be more than one easy handle waiting on the
same actual socket) */
struct Curl_hash sockhash;
/* `proto_hash` is a general key-value store for protocol implementations
* with the lifetime of the multi handle. The number of elements kept here
* should be in the order of supported protocols (and sub-protocols like
* TLS), *not* in the order of connections or current transfers!
* Elements need to be added with their own destructor to be invoked when
* the multi handle is cleaned up (see Curl_hash_add2()).*/
struct Curl_hash proto_hash;
/* Shared connection cache (bundles)*/
struct cpool cpool;
long max_host_connections; /* if >0, a fixed limit of the maximum number
of connections per host */
long max_total_connections; /* if >0, a fixed limit of the maximum number
of connections in total */
long max_shutdown_connections; /* if >0, a fixed limit of the maximum number
of connections in shutdown handling */
/* timer callback and user data pointer for the *socket() API */
curl_multi_timer_callback timer_cb;
void *timer_userp;
long last_timeout_ms; /* the last timeout value set via timer_cb */
struct curltime last_expire_ts; /* timestamp of last expiry */
#ifdef USE_WINSOCK
WSAEVENT wsa_event; /* Winsock event used for waits */
#else
#ifdef ENABLE_WAKEUP
curl_socket_t wakeup_pair[2]; /* eventfd()/pipe()/socketpair() used for
wakeup 0 is used for read, 1 is used
for write */
#endif
#endif
unsigned int max_concurrent_streams;
unsigned int maxconnects; /* if >0, a fixed limit of the maximum number of
entries we are allowed to grow the connection
cache to */
#define IPV6_UNKNOWN 0
#define IPV6_DEAD 1
#define IPV6_WORKS 2
unsigned char ipv6_up; /* IPV6_* defined */
BIT(multiplexing); /* multiplexing wanted */
BIT(recheckstate); /* see Curl_multi_connchanged */
BIT(in_callback); /* true while executing a callback */
#ifdef USE_OPENSSL
BIT(ssl_seeded);
#endif
BIT(dead); /* a callback returned error, everything needs to crash and
burn */
BIT(xfer_buf_borrowed); /* xfer_buf is currently being borrowed */
BIT(xfer_ulbuf_borrowed); /* xfer_ulbuf is currently being borrowed */
#ifdef DEBUGBUILD
BIT(warned); /* true after user warned of DEBUGBUILD */
#endif
};
#endif /* HEADER_CURL_MULTIHANDLE_H */
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