Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_OPENSOCKETFUNCTION.3 @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 .\" **************************************************************************
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2 .\" * _ _ ____ _
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3 .\" * Project ___| | | | _ \| |
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4 .\" * / __| | | | |_) | |
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5 .\" * | (__| |_| | _ <| |___
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6 .\" * \___|\___/|_| \_\_____|
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7 .\" *
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8 .\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 .\" *
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10 .\" * This software is licensed as described in the file COPYING, which
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11 .\" * you should have received as part of this distribution. The terms
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12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
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13 .\" *
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14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 .\" * copies of the Software, and permit persons to whom the Software is
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16 .\" * furnished to do so, under the terms of the COPYING file.
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17 .\" *
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18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 .\" * KIND, either express or implied.
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20 .\" *
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21 .\" **************************************************************************
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22 .\"
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23 .TH CURLOPT_OPENSOCKETFUNCTION 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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24 .SH NAME
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25 CURLOPT_OPENSOCKETFUNCTION \- set callback for opening sockets
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26 .SH SYNOPSIS
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27 .nf
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28 #include <curl/curl.h>
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30 typedef enum {
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31 CURLSOCKTYPE_IPCXN, /* socket created for a specific IP connection */
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32 CURLSOCKTYPE_ACCEPT, /* socket created by accept() call */
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33 CURLSOCKTYPE_LAST /* never use */
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34 } curlsocktype;
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36 struct curl_sockaddr {
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37 int family;
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38 int socktype;
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39 int protocol;
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40 unsigned int addrlen;
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41 struct sockaddr addr;
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42 };
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43
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44 curl_socket_t opensocket_callback(void *clientp,
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45 curlsocktype purpose,
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46 struct curl_sockaddr *address);
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47
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48 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_OPENSOCKETFUNCTION, opensocket_callback);
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49 .SH DESCRIPTION
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50 Pass a pointer to your callback function, which should match the prototype
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51 shown above.
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52
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53 This callback function gets called by libcurl instead of the \fIsocket(2)\fP
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54 call. The callback's \fIpurpose\fP argument identifies the exact purpose for
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55 this particular socket: \fICURLSOCKTYPE_IPCXN\fP is for IP based connections
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56 and \fICURLSOCKTYPE_ACCEPT\fP is for sockets created after accept() - such as
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57 when doing active FTP. Future versions of libcurl may support more
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58 purposes.
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59
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60 The \fIclientp\fP pointer contains whatever user-defined value set using the
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61 \fICURLOPT_OPENSOCKETDATA(3)\fP function.
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62
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63 The callback gets the resolved peer address as the \fIaddress\fP argument and
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64 is allowed to modify the address or refuse to connect completely. The callback
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65 function should return the newly created socket or \fICURL_SOCKET_BAD\fP in
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66 case no connection could be established or another error was detected. Any
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67 additional \fIsetsockopt(2)\fP calls can of course be done on the socket at
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68 the user's discretion. A \fICURL_SOCKET_BAD\fP return value from the callback
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69 function will signal an unrecoverable error to libcurl and it will return
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70 \fICURLE_COULDNT_CONNECT\fP from the function that triggered this callback.
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71 This return code can be used for IP address blacklisting.
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72
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73 If you want to pass in a socket with an already established connection, pass
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74 the socket back with this callback and then use
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75 \fICURLOPT_SOCKOPTFUNCTION(3)\fP to signal that it already is connected.
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76 .SH DEFAULT
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77 The default behavior is the equivalent of this:
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78 .nf
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79 return socket(addr->family, addr->socktype, addr->protocol);
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80 .fi
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81 .SH PROTOCOLS
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82 All
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83 .SH EXAMPLE
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84 .nf
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85 /* make libcurl use the already established socket 'sockfd' */
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86
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87 static curl_socket_t opensocket(void *clientp,
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88 curlsocktype purpose,
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89 struct curl_sockaddr *address)
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90 {
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91 curl_socket_t sockfd;
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92 sockfd = *(curl_socket_t *)clientp;
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93 /* the actual externally set socket is passed in via the OPENSOCKETDATA
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94 option */
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95 return sockfd;
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96 }
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98 static int sockopt_callback(void *clientp, curl_socket_t curlfd,
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99 curlsocktype purpose)
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100 {
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101 /* This return code was added in libcurl 7.21.5 */
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102 return CURL_SOCKOPT_ALREADY_CONNECTED;
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103 }
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104
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105 curl = curl_easy_init();
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106 if(curl) {
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107 /* libcurl will internally think that you connect to the host
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108 * and port that you specify in the URL option. */
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109 curl_easy_setopt(curl, CURLOPT_URL, "http://99.99.99.99:9999");
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110 /* call this function to get a socket */
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111 curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, opensocket);
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112 curl_easy_setopt(curl, CURLOPT_OPENSOCKETDATA, &sockfd);
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113
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114 /* call this function to set options for the socket */
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115 curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
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116
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117 res = curl_easy_perform(curl);
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118
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119 curl_easy_cleanup(curl);
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120 }
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121 .fi
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122 .SH AVAILABILITY
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123 Added in 7.17.1.
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124 .SH RETURN VALUE
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125 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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126 .SH "SEE ALSO"
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127 .BR CURLOPT_OPENSOCKETDATA "(3), " CURLOPT_SOCKOPTFUNCTION "(3), "
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128 .BR CURLOPT_CLOSESOCKETFUNCTION "(3), "