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* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
* Copyright (C) 1998 - 2019, Daniel Stenberg, <>, 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
* 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.
#include "curl_setup.h"
#include "nonblock.h" /* for curlx_nonblock(), formerly Curl_nonblock() */
#include "sockaddr.h"
#include "timeval.h"
CURLcode Curl_is_connected(struct connectdata *conn,
int sockindex,
bool *connected);
CURLcode Curl_connecthost(struct connectdata *conn,
const struct Curl_dns_entry *host);
/* generic function that returns how much time there's left to run, according
to the timeouts set */
timediff_t Curl_timeleft(struct Curl_easy *data,
struct curltime *nowp,
bool duringconnect);
#define DEFAULT_CONNECT_TIMEOUT 300000 /* milliseconds == five minutes */
* Used to extract socket and connectdata struct for the most recent
* transfer on the given Curl_easy.
* The returned socket will be CURL_SOCKET_BAD in case of failure!
curl_socket_t Curl_getconnectinfo(struct Curl_easy *data,
struct connectdata **connp);
bool Curl_addr2string(struct sockaddr *sa, curl_socklen_t salen,
char *addr, long *port);
* Check if a connection seems to be alive.
bool Curl_connalive(struct connectdata *conn);
/* When you run a program that uses the Windows Sockets API, you may
experience slow performance when you copy data to a TCP server.
Work-around: Make the Socket Send Buffer Size Larger Than the Program Send
Buffer Size
void Curl_sndbufset(curl_socket_t sockfd);
#define Curl_sndbufset(y) Curl_nop_stmt
void Curl_updateconninfo(struct connectdata *conn, curl_socket_t sockfd);
void Curl_persistconninfo(struct connectdata *conn);
int Curl_closesocket(struct connectdata *conn, curl_socket_t sock);
* The Curl_sockaddr_ex structure is basically libcurl's external API
* curl_sockaddr structure with enough space available to directly hold any
* protocol-specific address structures. The variable declared here will be
* used to pass / receive data to/from the fopensocket callback if this has
* been set, before that, it is initialized from parameters.
struct Curl_sockaddr_ex {
int family;
int socktype;
int protocol;
unsigned int addrlen;
union {
struct sockaddr addr;
struct Curl_sockaddr_storage buff;
} _sa_ex_u;
#define sa_addr _sa_ex_u.addr
* Create a socket based on info from 'conn' and 'ai'.
* Fill in 'addr' and 'sockfd' accordingly if OK is returned. If the open
* socket callback is set, used that!
CURLcode Curl_socket(struct connectdata *conn,
const Curl_addrinfo *ai,
struct Curl_sockaddr_ex *addr,
curl_socket_t *sockfd);
* Curl_conncontrol() marks the end of a connection/stream. The 'closeit'
* argument specifies if it is the end of a connection or a stream.
* For stream-based protocols (such as HTTP/2), a stream close will not cause
* a connection close. Other protocols will close the connection for both
* cases.
* It sets the bit.close bit to TRUE (with an explanation for debug builds),
* when the connection will close.
#define CONNCTRL_KEEP 0 /* undo a marked closure */
void Curl_conncontrol(struct connectdata *conn,
int closeit
, const char *reason
#define streamclose(x,y) Curl_conncontrol(x, CONNCTRL_STREAM, y)
#define connclose(x,y) Curl_conncontrol(x, CONNCTRL_CONNECTION, y)
#define connkeep(x,y) Curl_conncontrol(x, CONNCTRL_KEEP, y)
#define streamclose(x,y) Curl_conncontrol(x, CONNCTRL_STREAM)
#define connclose(x,y) Curl_conncontrol(x, CONNCTRL_CONNECTION)
#define connkeep(x,y) Curl_conncontrol(x, CONNCTRL_KEEP)
bool Curl_conn_data_pending(struct connectdata *conn, int sockindex);