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comparison mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_CAINFO.3 @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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23 .TH CURLOPT_CAINFO 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
24 .SH NAME
25 CURLOPT_CAINFO \- path to Certificate Authority (CA) bundle
26 .SH SYNOPSIS
27 #include <curl/curl.h>
28
29 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAINFO, char *path);
30 .SH DESCRIPTION
31 Pass a char * to a zero terminated string naming a file holding one or more
32 certificates to verify the peer with.
33
34 If \fICURLOPT_SSL_VERIFYPEER(3)\fP is zero and you avoid verifying the
35 server's certificate, \fICURLOPT_CAINFO(3)\fP need not even indicate an
36 accessible file.
37
38 This option is by default set to the system path where libcurl's cacert bundle
39 is assumed to be stored, as established at build time.
40
41 If curl is built against the NSS SSL library, the NSS PEM PKCS#11 module
42 (libnsspem.so) needs to be available for this option to work properly.
43 Starting with curl-7.55.0, if both \fICURLOPT_CAINFO(3)\fP and
44 \fICURLOPT_CAPATH(3)\fP are unset, NSS-linked libcurl tries to load
45 libnssckbi.so, which contains a more comprehensive set of trust information
46 than supported by nss-pem, because libnssckbi.so also includes information
47 about distrusted certificates.
48
49 (iOS and macOS) When curl uses Secure Transport this option is supported. If
50 the option is not set, then curl will use the certificates in the system and
51 user Keychain to verify the peer.
52
53 (Schannel) This option is supported for Schannel in Windows 7 or later but we
54 recommend not using it until Windows 8 since it works better starting then.
55 If the option is not set, then curl will use the certificates in the Windows'
56 store of root certificates (the default for Schannel).
57
58 The application does not have to keep the string around after setting this
59 option.
60 .SH DEFAULT
61 Built-in system specific. When curl is built with Secure Transport or
62 Schannel, this option is not set by default.
63 .SH PROTOCOLS
64 All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
65 .SH EXAMPLE
66 .nf
67 CURL *curl = curl_easy_init();
68 if(curl) {
69 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
70 curl_easy_setopt(curl, CURLOPT_CAINFO, "/etc/certs/cabundle.pem");
71 ret = curl_easy_perform(curl);
72 curl_easy_cleanup(curl);
73 }
74 .fi
75 .SH AVAILABILITY
76 For the SSL engines that don't support certificate files the CURLOPT_CAINFO
77 option is ignored. Schannel support added in libcurl 7.60.
78 .SH RETURN VALUE
79 Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
80 CURLE_OUT_OF_MEMORY if there was insufficient heap space.
81 .SH "SEE ALSO"
82 .BR CURLOPT_CAPATH "(3), "
83 .BR CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_SSL_VERIFYHOST "(3), "