static CURLcode bindlocal(struct connectdata *conn,
curl_socket_t sockfd, int af, unsigned int scope)
{
struct SessionHandle *data = conn->data;
struct Curl_sockaddr_storage sa;
struct sockaddr *sock = (struct sockaddr *)&sa; /* bind to this address */
curl_socklen_t sizeof_sa = 0; /* size of the data sock points to */
struct sockaddr_in *si4 = (struct sockaddr_in *)&sa;
#ifdef ENABLE_IPV6
struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)&sa;
#endif
struct Curl_dns_entry *h=NULL;
unsigned short port = data->set.localport; /* use this port number, 0 for
"random" */
/* how many port numbers to try to bind to, increasing one at a time */
int portnum = data->set.localportrange;
const char *dev = data->set.str[STRING_DEVICE];
int error;
/*************************************************************
* Select device to bind socket to
*************************************************************/
if(!dev && !port)
/* no local kind of binding was requested */
return CURLE_OK;
memset(&sa, 0, sizeof(struct Curl_sockaddr_storage));
if(dev && (strlen(dev)<255) ) {
char myhost[256] = "";
int done = 0; /* -1 for error, 1 for address found */
bool is_interface = FALSE;
bool is_host = FALSE;
static const char *if_prefix = "if!";
static const char *host_prefix = "host!";
if(strncmp(if_prefix, dev, strlen(if_prefix)) == 0) {
dev += strlen(if_prefix);
is_interface = TRUE;
}
else if(strncmp(host_prefix, dev, strlen(host_prefix)) == 0) {
dev += strlen(host_prefix);
is_host = TRUE;
}
/* interface */
if(!is_host) {
switch(Curl_if2ip(af, scope, conn->scope_id, dev,
myhost, sizeof(myhost))) {
case IF2IP_NOT_FOUND:
if(is_interface) {
/* Do not fall back to treating it as a host name */
failf(data, "Couldn't bind to interface '%s'", dev);
return CURLE_INTERFACE_FAILED;
}
break;
case IF2IP_AF_NOT_SUPPORTED:
/* Signal the caller to try another address family if available */
return CURLE_UNSUPPORTED_PROTOCOL;
case IF2IP_FOUND:
is_interface = TRUE;
/*
* We now have the numerical IP address in the 'myhost' buffer
*/
infof(data, "Local Interface %s is ip %s using address family %i\n",
dev, myhost, af);
done = 1;
#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.
*
*
* Only bind to the interface when specified as interface, not just
* as a hostname or ip address.
*/
if(setsockopt(sockfd, SOL_SOCKET, SO_BINDTODEVICE,
dev, (curl_socklen_t)strlen(dev)+1) != 0) {
error = SOCKERRNO;
infof(data, "SO_BINDTODEVICE %s failed with errno %d: %s;"
" will do regular bind\n",
dev, error, Curl_strerror(conn, error));
/* This is typically "errno 1, error: Operation not permitted" if
you're not running as root or another suitable privileged
user */
}
#endif
break;
}
}
if(!is_interface) {
/*
* This was not an interface, resolve the name as a host name
* or IP number
*
* Temporarily force name resolution to use only the address type
* of the connection. The resolve functions should really be changed
* to take a type parameter instead.
*/
long ipver = conn->ip_version;
int rc;
if(af == AF_INET)
conn->ip_version = CURL_IPRESOLVE_V4;
#ifdef ENABLE_IPV6
else if(af == AF_INET6)
conn->ip_version = CURL_IPRESOLVE_V6;
#endif
rc = Curl_resolv(conn, dev, 0, &h);
if(rc == CURLRESOLV_PENDING)
(void)Curl_resolver_wait_resolv(conn, &h);
conn->ip_version = ipver;
if(h) {
/* convert the resolved address, sizeof myhost >= INET_ADDRSTRLEN */
Curl_printable_address(h->addr, myhost, sizeof(myhost));
infof(data, "Name '%s' family %i resolved to '%s' family %i\n",
dev, af, myhost, h->addr->ai_family);
Curl_resolv_unlock(data, h);
done = 1;
}
else {
/*
* provided dev was no interface (or interfaces are not supported
* e.g. solaris) no ip address and no domain we fail here
*/
done = -1;
}
}
if(done > 0) {
#ifdef ENABLE_IPV6
/* IPv6 address */
if(af == AF_INET6) {
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
char *scope_ptr = strchr(myhost, '%');
if(scope_ptr)
*(scope_ptr++) = 0;
#endif
if(Curl_inet_pton(AF_INET6, myhost, &si6->sin6_addr) > 0) {
si6->sin6_family = AF_INET6;
si6->sin6_port = htons(port);
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
if(scope_ptr)
/* The "myhost" string either comes from Curl_if2ip or from
Curl_printable_address. The latter returns only numeric scope
IDs and the former returns none at all. So the scope ID, if
present, is known to be numeric */
si6->sin6_scope_id = atoi(scope_ptr);
#endif
}
sizeof_sa = sizeof(struct sockaddr_in6);
}
else
#endif
/* IPv4 address */
if((af == AF_INET) &&
(Curl_inet_pton(AF_INET, myhost, &si4->sin_addr) > 0)) {
si4->sin_family = AF_INET;
si4->sin_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in);
}
}
if(done < 1) {
failf(data, "Couldn't bind to '%s'", dev);
return CURLE_INTERFACE_FAILED;
}
}
else {
/* no device was given, prepare sa to match af's needs */
#ifdef ENABLE_IPV6
if(af == AF_INET6) {
si6->sin6_family = AF_INET6;
si6->sin6_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in6);
}
else
#endif
if(af == AF_INET) {
si4->sin_family = AF_INET;
si4->sin_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in);
}
}
for(;;) {
if(bind(sockfd, sock, sizeof_sa) >= 0) {
/* we succeeded to bind */
struct Curl_sockaddr_storage add;
curl_socklen_t size = sizeof(add);
memset(&add, 0, sizeof(struct Curl_sockaddr_storage));
if(getsockname(sockfd, (struct sockaddr *) &add, &size) < 0) {
data->state.os_errno = error = SOCKERRNO;
failf(data, "getsockname() failed with errno %d: %s",
error, Curl_strerror(conn, error));
return CURLE_INTERFACE_FAILED;
}
infof(data, "Local port: %hu\n", port);
conn->bits.bound = TRUE;
return CURLE_OK;
}
if(--portnum > 0) {
infof(data, "Bind to local port %hu failed, trying next\n", port);
port++; /* try next port */
/* We re-use/clobber the port variable here below */
if(sock->sa_family == AF_INET)
si4->sin_port = ntohs(port);
#ifdef ENABLE_IPV6
else
si6->sin6_port = ntohs(port);
#endif
}
else
break;
}
data->state.os_errno = error = SOCKERRNO;
failf(data, "bind failed with errno %d: %s",
error, Curl_strerror(conn, error));
return CURLE_INTERFACE_FAILED;
}
static CURLcode bindlocal(struct connectdata *conn,
curl_socket_t sockfd, int af)
{
struct SessionHandle *data = conn->data;
struct Curl_sockaddr_storage sa;
struct sockaddr *sock = (struct sockaddr *)&sa; /* bind to this address */
curl_socklen_t sizeof_sa = 0; /* size of the data sock points to */
struct sockaddr_in *si4 = (struct sockaddr_in *)&sa;
#ifdef ENABLE_IPV6
struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)&sa;
#endif
struct Curl_dns_entry *h=NULL;
unsigned short port = data->set.localport; /* use this port number, 0 for
"random" */
/* how many port numbers to try to bind to, increasing one at a time */
int portnum = data->set.localportrange;
const char *dev = data->set.str[STRING_DEVICE];
int error;
char myhost[256] = "";
int done = 0; /* -1 for error, 1 for address found */
bool is_interface = FALSE;
bool is_host = FALSE;
static const char *if_prefix = "if!";
static const char *host_prefix = "host!";
/*************************************************************
* Select device to bind socket to
*************************************************************/
if(!dev && !port)
/* no local kind of binding was requested */
return CURLE_OK;
memset(&sa, 0, sizeof(struct Curl_sockaddr_storage));
if(dev && (strlen(dev)<255) ) {
if(strncmp(if_prefix, dev, strlen(if_prefix)) == 0) {
dev += strlen(if_prefix);
is_interface = TRUE;
}
else if(strncmp(host_prefix, dev, strlen(host_prefix)) == 0) {
dev += strlen(host_prefix);
is_host = TRUE;
}
/* interface */
if(!is_host) {
return CURLE_UNSUPPORTED_PROTOCOL;
}
if(!is_interface) {
/*
* This was not an interface, resolve the name as a host name
* or IP number
*
* Temporarily force name resolution to use only the address type
* of the connection. The resolve functions should really be changed
* to take a type parameter instead.
*/
long ipver = conn->ip_version;
int rc;
if(af == AF_INET)
conn->ip_version = CURL_IPRESOLVE_V4;
#ifdef ENABLE_IPV6
else if(af == AF_INET6)
conn->ip_version = CURL_IPRESOLVE_V6;
#endif
rc = Curl_resolv(conn, dev, 0, &h);
if(rc == CURLRESOLV_PENDING)
(void)Curl_resolver_wait_resolv(conn, &h);
conn->ip_version = ipver;
if(h) {
/* convert the resolved address, sizeof myhost >= INET_ADDRSTRLEN */
Curl_printable_address(h->addr, myhost, sizeof(myhost));
infof(data, "Name '%s' family %i resolved to '%s' family %i\n",
dev, af, myhost, h->addr->ai_family);
Curl_resolv_unlock(data, h);
done = 1;
}
else {
/*
* provided dev was no interface (or interfaces are not supported
* e.g. solaris) no ip address and no domain we fail here
*/
done = -1;
}
}
if(done > 0) {
#ifdef ENABLE_IPV6
/* ipv6 address */
if(af == AF_INET6) {
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
char *scope_ptr = strchr(myhost, '%');
if(scope_ptr)
*(scope_ptr++) = 0;
#endif
if(Curl_inet_pton(AF_INET6, myhost, &si6->sin6_addr) > 0) {
si6->sin6_family = AF_INET6;
si6->sin6_port = htons(port);
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
if(scope_ptr)
/* The "myhost" string either comes from Curl_if2ip or from
Curl_printable_address. The latter returns only numeric scope
IDs and the former returns none at all. So the scope ID, if
present, is known to be numeric */
si6->sin6_scope_id = atoi(scope_ptr);
#endif
}
sizeof_sa = sizeof(struct sockaddr_in6);
}
else
#endif
/* ipv4 address */
if((af == AF_INET) &&
(Curl_inet_pton(AF_INET, myhost, &si4->sin_addr) > 0)) {
si4->sin_family = AF_INET;
si4->sin_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in);
}
}
if(done < 1) {
failf(data, "Couldn't bind to '%s'", dev);
return CURLE_INTERFACE_FAILED;
}
}
else {
/* no device was given, prepare sa to match af's needs */
#ifdef ENABLE_IPV6
if(af == AF_INET6) {
si6->sin6_family = AF_INET6;
si6->sin6_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in6);
}
else
#endif
if(af == AF_INET) {
si4->sin_family = AF_INET;
si4->sin_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in);
}
}
for(;;) {
if(bind(sockfd, sock, sizeof_sa) >= 0) {
/* we succeeded to bind */
struct Curl_sockaddr_storage add;
curl_socklen_t size = sizeof(add);
memset(&add, 0, sizeof(struct Curl_sockaddr_storage));
if(getsockname(sockfd, (struct sockaddr *) &add, &size) < 0) {
data->state.os_errno = error = SOCKERRNO;
failf(data, "getsockname() failed with errno %d: %s",
error, Curl_strerror(conn, error));
return CURLE_INTERFACE_FAILED;
}
infof(data, "Local port: %hu\n", port);
conn->bits.bound = TRUE;
return CURLE_OK;
}
if(--portnum > 0) {
infof(data, "Bind to local port %hu failed, trying next\n", port);
port++; /* try next port */
/* We re-use/clobber the port variable here below */
if(sock->sa_family == AF_INET)
si4->sin_port = ntohs(port);
#ifdef ENABLE_IPV6
else
si6->sin6_port = ntohs(port);
#endif
}
else
break;
}
data->state.os_errno = error = SOCKERRNO;
failf(data, "bind failed with errno %d: %s",
error, Curl_strerror(conn, error));
return CURLE_INTERFACE_FAILED;
}
