diff options
Diffstat (limited to 'docs/libcurl/opts/CURLOPT_OPENSOCKETFUNCTION.3')
-rw-r--r-- | docs/libcurl/opts/CURLOPT_OPENSOCKETFUNCTION.3 | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/docs/libcurl/opts/CURLOPT_OPENSOCKETFUNCTION.3 b/docs/libcurl/opts/CURLOPT_OPENSOCKETFUNCTION.3 new file mode 100644 index 000000000..70905c0c3 --- /dev/null +++ b/docs/libcurl/opts/CURLOPT_OPENSOCKETFUNCTION.3 @@ -0,0 +1,87 @@ +.\" ************************************************************************** +.\" * _ _ ____ _ +.\" * Project ___| | | | _ \| | +.\" * / __| | | | |_) | | +.\" * | (__| |_| | _ <| |___ +.\" * \___|\___/|_| \_\_____| +.\" * +.\" * Copyright (C) 1998 - 2014, 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 http://curl.haxx.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. +.\" * +.\" ************************************************************************** +.\" +.TH CURLOPT_OPENSOCKETFUNCTION 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options" +.SH NAME +CURLOPT_OPENSOCKETFUNCTION \- set callback for openening socket +.SH SYNOPSIS +.nf +#include <curl/curl.h> + +typedef enum { + CURLSOCKTYPE_IPCXN, /* socket created for a specific IP connection */ + CURLSOCKTYPE_ACCEPT, /* socket created by accept() call */ + CURLSOCKTYPE_LAST /* never use */ +} curlsocktype; + +struct curl_sockaddr { + int family; + int socktype; + int protocol; + unsigned int addrlen; + struct sockaddr addr; +}; + +curl_socket_t opensocket_callback(void *clientp, + curlsocktype purpose, + struct curl_sockaddr *address); + +CURLcode curl_easy_setopt(CURL *handle, CURLOPT_OPENSOCKETFUNCTION, opensocket_callback); +.SH DESCRIPTION +Pass a pointer to your callback function, which should match the prototype +shown above. + +This callback function gets called by libcurl instead of the \fIsocket(2)\fP +call. The callback's \fIpurpose\fP argument identifies the exact purpose for +this particular socket: \fICURLSOCKTYPE_IPCXN\fP is for IP based connections +and \fICURLSOCKTYPE_ACCEPT\fP is for sockets created after accept() - such as +when doing active FTP. Future versions of libcurl may support more +purposes. + +The callback gets the resolved peer address as the \fIaddress\fP argument and +is allowed to modify the address or refuse to connect completely. The callback +function should return the newly created socket or \fICURL_SOCKET_BAD\fP in +case no connection could be established or another error was detected. Any +additional \fIsetsockopt(2)\fP calls can of course be done on the socket at +the user's discretion. A \fICURL_SOCKET_BAD\fP return value from the callback +function will signal an unrecoverable error to libcurl and it will return +\fICURLE_COULDNT_CONNECT\fP from the function that triggered this callback. +This return code can be used for IP address blacklisting. + +If you want to pass in a socket with an already established connection, pass +the socket back with this callback and then use +\fICURLOPT_SOCKOPTFUNCTION(3)\fP to signal that it already is connected. +.SH DEFAULT +The default behavior is the equivalent of this: +.nf + return socket(addr->family, addr->socktype, addr->protocol); +.fi +.SH PROTOCOLS +All +.SH EXAMPLE +.SH AVAILABILITY +Added in 7.17.1. +.SH RETURN VALUE +Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. +.SH "SEE ALSO" +.BR CURLOPT_OPENSOCKETDATA "(3), " CURLOPT_SOCKOPTFUNCTION "(3), " +.BR CURLOPT_CLOSESOCKETFUNCTION "(3), " |