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Ben Greear's SO_BINDTODEVICE patch that binds to a network interface "even 

more" when the previous approach. Known to work on Linux, possibly on other
platforms as well.
This commit is contained in:
Daniel Stenberg 2004-02-13 09:50:23 +00:00
parent eb4d65d0ba
commit fa57a8a78e
1 changed files with 32 additions and 2 deletions
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34
lib/connect.c
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@ -228,6 +228,7 @@ static CURLcode bindlocal(struct connectdata *conn,
char myhost[256] = "";
in_addr_t in;
int rc;
bool was_iface = FALSE;
/* First check if the given name is an IP address */
in=inet_addr(data->set.device);
@ -239,7 +240,10 @@ static CURLcode bindlocal(struct connectdata *conn,
*/
rc = Curl_resolv(conn, myhost, 0, &h);
if(rc == 1)
rc = Curl_wait_for_resolv(conn, &h);
(void)Curl_wait_for_resolv(conn, &h);
if(h)
was_iface = TRUE;
}
else {
@ -250,7 +254,7 @@ static CURLcode bindlocal(struct connectdata *conn,
*/
rc = Curl_resolv(conn, data->set.device, 0, &h);
if(rc == 1)
rc = Curl_wait_for_resolv(conn, &h);
(void)Curl_wait_for_resolv(conn, &h);
if(h)
/* we know data->set.device is shorter than the myhost array */
@ -266,11 +270,37 @@ static CURLcode bindlocal(struct connectdata *conn,
hostent_buf,
sizeof(hostent_buf));
*/
failf(data, "Couldn't bind to '%s'", data->set.device);
return CURLE_HTTP_PORT_FAILED;
}
infof(data, "We bind local end to %s\n", myhost);
#ifdef SO_BINDTODEVICE
/* I am not sure any other OSs than Linux that provide this feature, and
* at the least I cannot test. --Ben
*
* This feature allows one to tightly bind the local socket to a
* particular interface. This will force even requests to other local
* interfaces to go out the external interface.
*
*/
if (was_iface) {
/* Only bind to the interface when specified as interface, not just as a
* hostname or ip address.
*/
if (setsockopt(sockfd, SOL_SOCKET, SO_BINDTODEVICE,
data->set.device, strlen(data->set.device)+1) != 0) {
/* printf("Failed to BINDTODEVICE, socket: %d device: %s error: %s\n",
sockfd, data->set.device, strerror(errno)); */
infof(data, "SO_BINDTODEVICE %s failed\n",
data->set.device);
/* This is typiclally "errno 1, error: Operation not permitted" if
you're not running as root or another suitable privileged user */
}
}
#endif
in=inet_addr(myhost);
if (CURL_INADDR_NONE != in) {