DWS/chrony
1
0
Fork 0
mirror of https://gitlab.com/chrony/chrony.git synced 2025-12-05 07:35:07 -05:00
Code Issues Packages Projects Releases Wiki Activity

socket: add support for binding sockets to device

Browse Source 
As a Linux-specific feature, allow sockets to be bound to a device using
the SO_BINDTODEVICE socket option. The CAP_NET_RAW capability is
required for setting the option.
This commit is contained in:
Miroslav Lichvar
2020-06-30 10:21:45 +02:00
parent 0f04baeb97
commit 4ef944b734
9 changed files with 45 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
socket.c
View File

@@ -336,6 +336,23 @@ is_any_address(IPAddr *addr)
/* ================================================== */
static int
bind_device(int sock_fd, const char *iface)
{
#ifdef SO_BINDTODEVICE
if (setsockopt(sock_fd, SOL_SOCKET, SO_BINDTODEVICE, iface, strlen(iface) + 1) < 0) {
DEBUG_LOG("Could not bind socket to %s : %s", iface, strerror(errno));
return 0;
}
return 1;
#else
DEBUG_LOG("Could not bind socket to %s : %s", "Not supported");
return 0;
#endif
}
/* ================================================== */
static int
bind_ip_address(int sock_fd, IPSockAddr *addr, int flags)
{
@@ -403,7 +420,8 @@ connect_ip_address(int sock_fd, IPSockAddr *addr)
/* ================================================== */
static int
open_ip_socket(IPSockAddr *remote_addr, IPSockAddr *local_addr, int type, int flags)
open_ip_socket(IPSockAddr *remote_addr, IPSockAddr *local_addr, const char *iface,
int type, int flags)
{
int domain, family, sock_fd;
@@ -442,6 +460,9 @@ open_ip_socket(IPSockAddr *remote_addr, IPSockAddr *local_addr, int type, int fl
if (!set_ip_options(sock_fd, family, flags))
goto error;
if (iface && !bind_device(sock_fd, iface))
goto error;
/* Bind the socket if a non-any local address/port was specified */
if (local_addr && local_addr->ip_addr.family != IPADDR_UNSPEC &&
(local_addr->port != 0 || !is_any_address(&local_addr->ip_addr)) &&
@@ -1213,17 +1234,17 @@ SCK_SetPrivBind(int (*function)(int sock_fd, struct sockaddr *address,
/* ================================================== */
int
SCK_OpenUdpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr, int flags)
SCK_OpenUdpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr, const char *iface, int flags)
{
return open_ip_socket(remote_addr, local_addr, SOCK_DGRAM, flags);
return open_ip_socket(remote_addr, local_addr, iface, SOCK_DGRAM, flags);
}
/* ================================================== */
int
SCK_OpenTcpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr, int flags)
SCK_OpenTcpSocket(IPSockAddr *remote_addr, IPSockAddr *local_addr, const char *iface, int flags)
{
return open_ip_socket(remote_addr, local_addr, SOCK_STREAM, flags);
return open_ip_socket(remote_addr, local_addr, iface, SOCK_STREAM, flags);
}
/* ================================================== */