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CURLOPT_INTERFACE: avoid resolving interfaces names

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Do not try to resolve interfaces names via DNS by recognizing interface
names in a few ways.  If the interface option argument has a prefix of
"if!" then treat the argument as only an interface.  Similarly, if the
interface argument is the name of an interface (even if it does not have
an IP address assigned), treat it as an interface name.  Finally, if the
interface argument is prefixed by "host!" treat it as a hostname that
must be resolved by /etc/hosts or DNS.

These changes allow a client using the multi interfaces to avoid
blocking on name resolution if the interface loses its IP address or
disappears.
This commit is contained in:
Jason Glasgow
2011-11-04 16:48:05 -04:00
committed by Daniel Stenberg
parent ba057c2e19
commit 6e4835c795
4 changed files with 57 additions and 1 deletions
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9
docs/libcurl/curl_easy_setopt.3
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@@ -843,6 +843,15 @@ negotiation. (Added in 7.19.4).
Pass a char * as parameter. This sets the interface name to use as outgoing
network interface. The name can be an interface name, an IP address, or a host
name.
Starting with 7.24.0: If the parameter starts with "if!" then it is treated as
only as interface name and no attempt will ever be named to do treat it as an
IP address or to do name resolution on it. If the parameter starts with
\&"host!" it is treated as either an IP address or a hostname. Hostnames are
resolved synchronously. Using the if! format is highly recommended when using
the multi interfaces to avoid allowing the code to block. If "if!" is
specified but the parameter does not match an existing interface,
CURLE_INTERFACE_FAILED is returned.
.IP CURLOPT_LOCALPORT
Pass a long. This sets the local port number of the socket used for
connection. This can be used in combination with \fICURLOPT_INTERFACE\fP and