54 lines
1.6 KiB
Groff
54 lines
1.6 KiB
Groff
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.\" generated by cd2nroff 0.1 from CURLOPT_DNS_LOCAL_IP4.md
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.TH CURLOPT_DNS_LOCAL_IP4 3 "2025-07-07" libcurl
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.SH NAME
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CURLOPT_DNS_LOCAL_IP4 \- IPv4 address to bind DNS resolves to
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_LOCAL_IP4, char *address);
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.fi
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.SH DESCRIPTION
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Set the local IPv4 \fIaddress\fP that the resolver should bind to. The argument
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should be of type char * and contain a single numerical IPv4 address as a
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string. Set this option to NULL to use the default setting (do not bind to a
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specific IP address).
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The application does not have to keep the string around after setting this
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option.
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Using this option multiple times makes the last set string override the
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previous ones. Set it to NULL to disable its use again.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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This functionality affects all supported protocols
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.SH EXAMPLE
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.nf
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
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curl_easy_setopt(curl, CURLOPT_DNS_LOCAL_IP4, "192.168.0.14");
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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.fi
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.SH NOTES
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This option requires that libcurl was built with a resolver backend that
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supports this operation. The c\-ares backend is the only such one.
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.SH AVAILABILITY
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Added in curl 7.33.0
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.SH RETURN VALUE
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\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
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\fIlibcurl\-errors(3)\fP.
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.SH SEE ALSO
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.BR CURLOPT_DNS_INTERFACE (3),
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.BR CURLOPT_DNS_LOCAL_IP6 (3),
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.BR CURLOPT_DNS_SERVERS (3)
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