curl: (45) bind failed with errno 22: Invalid argument

Hello,

Error
An error curl: (45) bind failed with errno 22: Invalid argument occurs
whenever we specify IPv4 from local interface as a source address trying
to connect to a site which have both IPv4 and IPv6.

Steps to reproduce
Pick up a domain which resolves both to IPv4 and IPv6:

# host canhazip.com
canhazip.com has address 104.16.222.38
canhazip.com has address 104.16.223.38
canhazip.com has IPv6 address 2606:4700::6810:de26
canhazip.com has IPv6 address 2606:4700::6810:df26

The request:

# curl --interface 1.2.3.4 https://canhazip.com/
curl: (45) bind failed with errno 22: Invalid argument

can be fixed with -4 flag:

# curl --interface 1.2.3.4 -4 https://canhazip.com/
1.2.3.4

OS
Tested with CentOS 7:

default version cURL: curl-7.29.0-51.el7.x86_64and from a git
repository: curl 7.65.1-DEV (x86_64-unknown-linux-gnu)
libcurl/7.65.1-DEV OpenSSL/1.0.2k-fips zlib/1.2.7
Results are the same.

Expected behavior:
Whenever a source IPv4 is specified cURL should auto add -4 flag, i.e.:

curl_easy_setopt(easyhandle, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);

The same with IPv6, whenever a source IPv6 is specified cURL should auto
add -6 flag, i.e.

curl_easy_setopt(easyhandle, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V6);

Regards,
Alex.

-----------------------------------------------------------
Unsubscribe: https://cool.haxx.se/list/listinfo/curl-users
Etiquette: https://curl.haxx.se/mail/etiquette.html
Received on 2019-06-07