Update networking layer w/ CURL and emscripten impl

2025-11-08 01:50:36 +11:00
parent a17925904d
commit f6874dc55a
4105 changed files with 694617 additions and 179 deletions
@@ -0,0 +1,95 @@
+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_INTERFACE
+Section: 3
+Source: libcurl
+Protocol:
+  - All
+See-also:
+  - CURLOPT_SOCKOPTFUNCTION (3)
+  - CURLOPT_TCP_NODELAY (3)
+  - CURLOPT_LOCALPORT (3)
+Added-in: 7.3
+---
+
+# NAME
+
+CURLOPT_INTERFACE - source interface for outgoing traffic
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_INTERFACE, char *interface);
+~~~
+
+# DESCRIPTION
+
+Pass a char pointer 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 hostname. If you prefer one of these, you can use the following special
+prefixes:
+
+* `if!\<name\>` - Interface name
+* `host!\<name\>` - IP address or hostname
+* `ifhost!\<interface\>!\<host\>` - Interface name and IP address or hostname
+
+If `if!` or `ifhost!` is specified but the parameter does not match an existing
+interface, *CURLE_INTERFACE_FAILED* is returned from the libcurl function used
+to perform the transfer.
+
+libcurl does not support using network interface names for this option on
+Windows.
+
+We strongly advise against specifying the interface with a hostname, as it
+causes libcurl to do a blocking name resolve call to retrieve the IP address.
+That name resolve operation does **not** use DNS-over-HTTPS even if
+CURLOPT_DOH_URL(3) is set.
+
+The application does not have to keep the string around after setting this
+option.
+
+Using this option multiple times makes the last set string override the
+previous ones. Set it to NULL to disable its use again.
+
+# DEFAULT
+
+NULL, use whatever the TCP stack finds suitable
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
+
+    curl_easy_setopt(curl, CURLOPT_INTERFACE, "eth0");
+
+    res = curl_easy_perform(curl);
+
+    curl_easy_cleanup(curl);
+  }
+}
+~~~
+
+# HISTORY
+
+The `if!` and `host!` syntax was added in 7.24.0.
+
+The `ifhost!` syntax was added in 8.9.0.
+
+# %AVAILABILITY%
+
+# RETURN VALUE
+
+curl_easy_setopt(3) returns a CURLcode indicating success or error.
+
+CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
+libcurl-errors(3).