resolve.c File Reference

#include "syshead.h"
#include "buffer.h"
#include "crypto.h"
#include "manage.h"
#include "openvpn.h"
#include "socket.h"
#include "socket_util.h"
#include "resolve.h"

Include dependency graph for resolve.c:

Go to the source code of this file.

Macros
#define	n_rnd_bytes   6

Functions
unsigned int	sf2gaf (const unsigned int getaddr_flags, const unsigned int sockflags)
	Convert sockflags/getaddr_flags into getaddr_flags.
static const char *	getaddrinfo_addr_family_name (int af)
	Small helper function for openvpn_getaddrinfo to print the address family when resolving fails.
static const char *	hostname_randomize (const char *hostname, struct gc_arena *gc)
int	openvpn_getaddrinfo (unsigned int flags, const char *hostname, const char *servname, int resolve_retry_seconds, struct signal_info *sig_info, int ai_family, struct addrinfo **res)
static int	get_addr_generic (sa_family_t af, unsigned int flags, const char *hostname, void *network, unsigned int *netbits, int resolve_retry_seconds, struct signal_info *sig_info, msglvl_t msglevel)
in_addr_t	getaddr (unsigned int flags, const char *hostname, int resolve_retry_seconds, bool *succeeded, struct signal_info *sig_info)
	Translate an IPv4 addr or hostname from string form to in_addr_t.
in_addr_t	get_ip_addr (const char *ip_string, msglvl_t msglevel, bool *error)
bool	get_ipv6_addr (const char *hostname, struct in6_addr *network, unsigned int *netbits, msglvl_t msglevel)
	Translate an IPv6 addr or hostname from string form to in6_addr.
int	get_cached_dns_entry (struct cached_dns_entry *dns_cache, const char *hostname, const char *servname, int ai_family, unsigned int resolve_flags, struct addrinfo **ai)
	get_cached_dns_entry return 0 on success and -1 otherwise.
static int	do_preresolve_host (struct context *c, const char *hostname, const char *servname, const int af, const unsigned int flags)
void	do_preresolve (struct context *c)

Macro Definition Documentation

n_rnd_bytes

#define n_rnd_bytes   6

Referenced by hostname_randomize().

Function Documentation

do_preresolve()

void do_preresolve

(

struct context *

c

)

Definition at line 573 of file resolve.c.

References connection_entry::af, connection_list::array, local_list::array, connection_entry::bind_local, options::connection_list, do_preresolve_host(), connection_entry::flags, GETADDR_DATAGRAM, GETADDR_FATAL, GETADDR_MENTION_RESOLVE_RETRY, GETADDR_PASSIVE, GETADDR_RANDOMIZE, GETADDR_RESOLVE, GETADDR_UPDATE_MANAGEMENT_STATE, connection_entry::http_proxy_options, options::ip_remote_hint, connection_list::len, local_list::len, local_entry::local, connection_entry::local_list, context::options, http_proxy_options::port, local_entry::port, connection_entry::proto, proto_is_dgram(), connection_entry::remote, connection_entry::remote_port, http_proxy_options::server, SF_HOST_RANDOMIZE, SIGHUP, options::sockflags, connection_entry::socks_proxy_port, connection_entry::socks_proxy_server, status, and throw_signal_soft().

Referenced by init_instance().

do_preresolve_host()

int do_preresolve_host ( struct context * c, const char * hostname, const char * servname, const int af, const unsigned int flags )

static

Definition at line 529 of file resolve.c.

References cached_dns_entry::ai, ALLOC_OBJ_CLEAR_GC, context::c1, context_1::dns_cache, cached_dns_entry::flags, context::gc, gc_addspecial(), gc_freeaddrinfo_callback(), get_cached_dns_entry(), GETADDR_CACHE_MASK, cached_dns_entry::hostname, cached_dns_entry::next, openvpn_getaddrinfo(), context::options, options::resolve_retry_seconds, cached_dns_entry::servname, and status.

Referenced by do_preresolve().

get_addr_generic()

int get_addr_generic ( sa_family_t af, unsigned int flags, const char * hostname, void * network, unsigned int * netbits, int resolve_retry_seconds, struct signal_info * sig_info, msglvl_t msglevel )

static

Definition at line 324 of file resolve.c.

References GETADDR_HOST_ORDER, M_ERRNO, M_NONFATAL, M_WARN, msg, and openvpn_getaddrinfo().

Referenced by get_ipv6_addr(), and getaddr().

get_cached_dns_entry()

int get_cached_dns_entry	(	struct cached_dns_entry *	dns_cache,
		const char *	hostname,
		const char *	servname,
		int	ai_family,
		unsigned int	resolve_flags,
		struct addrinfo **	ai )

get_cached_dns_entry return 0 on success and -1 otherwise.

(like getaddrinfo())

Definition at line 506 of file resolve.c.

References cached_dns_entry::ai, cached_dns_entry::ai_family, cached_dns_entry::flags, GETADDR_CACHE_MASK, cached_dns_entry::hostname, cached_dns_entry::next, cached_dns_entry::servname, and streqnull().

Referenced by do_preresolve_host(), resolve_bind_local(), and resolve_remote().

get_ip_addr()

in_addr_t get_ip_addr	(	const char *	ip_string,
		msglvl_t	msglevel,
		bool *	error )

Definition at line 469 of file resolve.c.

References getaddr(), GETADDR_FATAL, GETADDR_HOST_ORDER, and M_FATAL.

Referenced by add_option(), and dhcp_option_address_parse().

get_ipv6_addr()

bool get_ipv6_addr	(	const char *	hostname,
		struct in6_addr *	network,
		unsigned int *	netbits,
		msglvl_t	msglevel )

Translate an IPv6 addr or hostname from string form to in6_addr.

Definition at line 489 of file resolve.c.

References get_addr_generic(), and GETADDR_RESOLVE.

Referenced by add_option(), dhcp_option_dns6_parse(), ifconfig_pool_read(), init_route_ipv6(), ipv6_addr_safe_hexplusbits(), option_iroute_ipv6(), and remove_iroutes_from_push_route_list().

getaddr()

in_addr_t getaddr	(	unsigned int	flags,
		const char *	hostname,
		int	resolve_retry_seconds,
		bool *	succeeded,
		struct signal_info *	sig_info )

Translate an IPv4 addr or hostname from string form to in_addr_t.

In case of resolve error, it will try again for resolve_retry_seconds seconds.

Definition at line 442 of file resolve.c.

References get_addr_generic(), M_WARN, and status.

Referenced by add_client_nat_to_option_list(), add_host_route_array(), add_option(), get_adapter_ip_netmask(), get_ip_addr(), ifconfig_pool_read(), init_route(), init_route_list(), init_tun(), ip_addr_string_to_array(), man_kill(), option_iroute(), and remove_iroutes_from_push_route_list().

getaddrinfo_addr_family_name()

const char * getaddrinfo_addr_family_name ( int af )

static

Small helper function for openvpn_getaddrinfo to print the address family when resolving fails.

Definition at line 63 of file resolve.c.

Referenced by openvpn_getaddrinfo().

hostname_randomize()

const char * hostname_randomize ( const char * hostname, struct gc_arena * gc )

static

Definition at line 82 of file resolve.c.

References alloc_buf_gc(), BSTR, buf_printf(), format_hex_ex(), gc, n_rnd_bytes, and prng_bytes().

Referenced by openvpn_getaddrinfo().

openvpn_getaddrinfo()

int openvpn_getaddrinfo	(	unsigned int	flags,
		const char *	hostname,
		const char *	servname,
		int	resolve_retry_seconds,
		struct signal_info *	sig_info,
		int	ai_family,
		struct addrinfo **	res )

Definition at line 102 of file resolve.c.

References ASSERT, CLEAR, D_RESOLVE_ERRORS, D_SOCKET_DEBUG, dmsg, gc, gc_free(), gc_new(), get_signal(), GETADDR_DATAGRAM, GETADDR_FATAL, GETADDR_FATAL_ON_SIGNAL, GETADDR_HOST_ORDER, GETADDR_MENTION_RESOLVE_RETRY, GETADDR_MSG_VIRT_OUT, GETADDR_PASSIVE, GETADDR_RANDOMIZE, GETADDR_RESOLVE, GETADDR_TRY_ONCE, GETADDR_UPDATE_MANAGEMENT_STATE, GETADDR_WARN_ON_SIGNAL, getaddrinfo_addr_family_name(), hostname_randomize(), M_FATAL, M_MSG_VIRT_OUT, M_WARN, management_set_state(), management_sleep(), msg, OPENVPN_STATE_RESOLVE, signal_info::signal_received, signal_reset(), SIGUSR1, and status.

Referenced by dns_server_addr_parse(), do_preresolve_host(), get_addr_generic(), init_route(), man_settings_init(), management_post_tunnel_open(), resolve_bind_local(), and resolve_remote().

sf2gaf()

unsigned int sf2gaf	(	const unsigned int	getaddr_flags,
		const unsigned int	sockflags )

Convert sockflags/getaddr_flags into getaddr_flags.

Definition at line 42 of file resolve.c.

References GETADDR_RANDOMIZE, and SF_HOST_RANDOMIZE.

Referenced by resolve_remote().