Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_SSH_KEYFUNCTION.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_SSH_KEYFUNCTION 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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24 .SH NAME
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25 CURLOPT_SSH_KEYFUNCTION \- callback for known host matching logic
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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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29
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30 enum curl_khstat {
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31 CURLKHSTAT_FINE_ADD_TO_FILE,
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32 CURLKHSTAT_FINE,
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33 CURLKHSTAT_REJECT, /* reject the connection, return an error */
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34 CURLKHSTAT_DEFER, /* do not accept it, but we can't answer right
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35 now so this causes a CURLE_DEFER error but
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36 otherwise the connection will be left intact
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37 etc */
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38 };
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39
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40 enum curl_khmatch {
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41 CURLKHMATCH_OK, /* match */
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42 CURLKHMATCH_MISMATCH, /* host found, key mismatch! */
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43 CURLKHMATCH_MISSING, /* no matching host/key found */
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44 };
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45
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46 struct curl_khkey {
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47 const char *key; /* points to a zero-terminated string encoded with
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48 base64 if len is zero, otherwise to the "raw"
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49 data */
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50 size_t len;
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51 enum curl_khtype keytype;
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52 };
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53
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54 int ssh_keycallback(CURL *easy,
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55 const struct curl_khkey *knownkey,
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56 const struct curl_khkey *foundkey,
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57 enum curl_khmatch,
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58 void *clientp);
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59
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60 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_KEYFUNCTION,
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61 ssh_keycallback);
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62 .SH DESCRIPTION
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63 Pass a pointer to your callback function, which should match the prototype
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64 shown above.
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65
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66 It gets called when the known_host matching has been done, to allow the
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67 application to act and decide for libcurl how to proceed. The callback will
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68 only be called if \fICURLOPT_SSH_KNOWNHOSTS(3)\fP is also set.
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69
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70 This callback function gets passed the CURL handle, the key from the
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71 known_hosts file \fIknownkey\fP, the key from the remote site \fIfoundkey\fP,
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72 info from libcurl on the matching status and a custom pointer (set with
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73 \fICURLOPT_SSH_KEYDATA(3)\fP). It MUST return one of the following return
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74 codes to tell libcurl how to act:
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75
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76 .IP CURLKHSTAT_FINE_ADD_TO_FILE
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77 The host+key is accepted and libcurl will append it to the known_hosts file
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78 before continuing with the connection. This will also add the host+key combo
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79 to the known_host pool kept in memory if it wasn't already present there. The
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80 adding of data to the file is done by completely replacing the file with a new
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81 copy, so the permissions of the file must allow this.
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82 .IP CURLKHSTAT_FINE
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83 The host+key is accepted libcurl will continue with the connection. This will
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84 also add the host+key combo to the known_host pool kept in memory if it wasn't
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85 already present there.
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86 .IP CURLKHSTAT_REJECT
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87 The host+key is rejected. libcurl will deny the connection to continue and it
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88 will be closed.
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89 .IP CURLKHSTAT_DEFER
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90 The host+key is rejected, but the SSH connection is asked to be kept alive.
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91 This feature could be used when the app wants to somehow return back and act
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92 on the host+key situation and then retry without needing the overhead of
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93 setting it up from scratch again.
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94 .SH DEFAULT
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95 NULL
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96 .SH PROTOCOLS
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97 SFTP and SCP
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98 .SH EXAMPLE
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99 .nf
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100 static int keycb(CURL *easy,
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101 const struct curl_khkey *knownkey,
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102 const struct curl_khkey *foundkey,
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103 enum curl_khmatch,
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104 void *clientp)
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105 {
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106 /* 'clientp' points to the callback_data struct */
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107 /* investigate the situation and return the correct value */
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108 return CURLKHSTAT_FINE_ADD_TO_FILE;
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109 }
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110 {
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111 curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/thisfile.txt");
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112 curl_easy_setopt(curl, CURLOPT_SSH_KEYFUNCTION, keycb);
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113 curl_easy_setopt(curl, CURLOPT_SSH_KEYDATA, &callback_data);
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114 curl_easy_setopt(curl, CURLOPT_SSH_KNOWNHOSTS, "/home/user/known_hosts");
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115
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116 curl_easy_perform(curl);
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117 }
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118 .fi
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119 .SH AVAILABILITY
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120 Added in 7.19.6
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121 .SH RETURN VALUE
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122 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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123 .SH "SEE ALSO"
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124 .BR CURLOPT_SSH_KEYDATA "(3), " CURLOPT_SSH_KNOWNHOSTS "(3), "