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openconnect-internal.h
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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2008-2015 Intel Corporation.
* Copyright © 2008 Nick Andrew <nick@nick-andrew.net>
* Copyright © 2013 John Morrissey <jwm@horde.net>
*
* Author: David Woodhouse <dwmw2@infradead.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
#ifndef __OPENCONNECT_INTERNAL_H__
#define __OPENCONNECT_INTERNAL_H__
#define __OPENCONNECT_PRIVATE__
/*
* We need to include <winsock2.h> or <winsock.h> before openconnect.h.
* Indeed openconnect.h is specifically intended not to be self-sufficient,
* so that end-users can choose between <winsock.h> and <winsock2.h>.
*/
#ifdef _WIN32
#include <winsock2.h>
#endif
#include "openconnect.h"
#include "json.h"
#if defined(OPENCONNECT_OPENSSL)
#include <openssl/ssl.h>
#include <openssl/err.h>
/* Ick */
#if OPENSSL_VERSION_NUMBER >= 0x00909000L
#define method_const const
#else
#define method_const
#endif
#endif
#if defined(OPENCONNECT_GNUTLS)
#include <gnutls/gnutls.h>
#include <gnutls/abstract.h>
#include <gnutls/x509.h>
#include <gnutls/crypto.h>
#endif
#ifdef HAVE_ICONV
#include <langinfo.h>
#include <iconv.h>
#endif
#ifdef LIBPROXY_HDR
#include LIBPROXY_HDR
#endif
#ifdef HAVE_LIBSTOKEN
#include <stoken.h>
#endif
#ifdef HAVE_GSSAPI
#include GSSAPI_HDR
#endif
#ifdef HAVE_LIBPSKC
#include <pskc/pskc.h>
#endif
#ifdef HAVE_LIBP11
#include <libp11.h>
#endif
#ifdef HAVE_EPOLL
#include <sys/epoll.h>
#endif
#ifdef ENABLE_NLS
#include <libintl.h>
#define _(s) dgettext("openconnect", s)
#else
#define _(s) ((char *)(s))
#endif
#define N_(s) s
#include <libxml/tree.h>
#include <zlib.h>
#ifdef _WIN32
#ifndef _Out_cap_c_
#define _Out_cap_c_(sz)
#endif
#ifndef _Ret_bytecount_
#define _Ret_bytecount_(sz)
#endif
#ifndef _Post_maybenull_
#define _Post_maybenull_
#endif
#include "wintun.h"
#include <ws2tcpip.h>
#ifndef SECURITY_WIN32
#define SECURITY_WIN32 1
#endif
#include <security.h>
#else
#include <sys/socket.h>
#include <sys/select.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#endif
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
/* Equivalent of "/dev/null" on Windows.
* See https://stackoverflow.com/a/44163934
*/
#ifdef _WIN32
#define DEVNULL "NUL:"
#else
#define DEVNULL "/dev/null"
#endif
#define SHA512_SIZE 64
#define SHA384_SIZE 48
#define SHA256_SIZE 32
#define SHA1_SIZE 20
#define MD5_SIZE 16
/* FreeBSD provides this in <sys/param.h> */
#ifndef MAX
#define MAX(x,y) (((x)>(y))?(x):(y))
#endif
#ifndef MIN
#define MIN(x,y) (((x)<(y))?(x):(y))
#endif
/* At least MinGW headers seem not to provide IPPROTO_IPIP */
#ifndef IPPROTO_IPIP
#define IPPROTO_IPIP 0x04
#endif
#ifdef HAVE_VHOST
#include <linux/virtio_net.h>
#include <linux/vhost.h>
struct oc_vring {
struct vring_desc *desc;
struct vring_avail *avail;
struct vring_used *used;
uint16_t seen_used;
};
#endif
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
/****************************************************************************/
struct pkt {
int alloc_len;
int len;
struct pkt *next;
union {
struct {
uint32_t spi;
uint32_t seq;
unsigned char iv[16];
unsigned char payload[];
} esp;
struct {
unsigned char pad[2];
unsigned char rec[2];
unsigned char kmp[20];
} oncp;
struct {
unsigned char pad[16];
unsigned char hdr[8];
} cstp;
struct {
unsigned char pad[8];
unsigned char hdr[16];
} gpst;
struct {
unsigned char pad[8];
uint32_t vendor;
uint32_t type;
uint32_t len;
uint32_t ident;
} pulse;
struct {
uint32_t hlen; /* variable-length */
uint16_t proto;
unsigned char hdr[18];
} ppp;
#ifdef HAVE_VHOST
struct {
unsigned char pad[12];
struct virtio_net_hdr_mrg_rxbuf h;
} virtio;
#endif
};
unsigned char data[];
};
#define pkt_offset(field) ((intptr_t)&((struct pkt *)NULL)->field)
#define pkt_from_hdr(addr, field) ((struct pkt *) ((intptr_t)(addr) - pkt_offset(field) ))
#define REKEY_NONE 0
#define REKEY_TUNNEL 1
#define REKEY_SSL 2
#define KA_NONE 0
#define KA_DPD 1
#define KA_DPD_DEAD 2
#define KA_KEEPALIVE 3
#define KA_REKEY 4
#define DTLS_NOSECRET 0 /* Random secret has not been generated yet */
#define DTLS_SECRET 1 /* Secret is present, ready to attempt DTLS */
#define DTLS_DISABLED 2 /* DTLS was disabled on the *client* side */
#define DTLS_SLEEPING 3 /* For ESP, sometimes sending probes */
#define DTLS_CONNECTING 4 /* DTLS (re)handshaking. Not used for ESP */
#define DTLS_CONNECTED 5 /* Transport connected but not yet enabled */
#define DTLS_ESTABLISHED 6 /* Data path fully established */
/* Not to be confused with OC_PROTO_xxx flags which are library-visible */
#define PROTO_ANYCONNECT 0
#define PROTO_NC 1
#define PROTO_GPST 2
#define PROTO_PULSE 3
#define PROTO_F5 4
#define PROTO_FORTINET 5
#define PROTO_NULLPPP 6
#define PROTO_ARRAY 7
/* All supported PPP packet framings/encapsulations */
#define PPP_ENCAP_RFC1661 1 /* Plain/synchronous/pre-framed PPP (RFC1661) */
#define PPP_ENCAP_RFC1662_HDLC 2 /* PPP with HDLC-like framing (RFC1662) */
#define PPP_ENCAP_F5 3 /* F5 BigIP no HDLC */
#define PPP_ENCAP_F5_HDLC 4 /* F5 BigIP HDLC */
#define PPP_ENCAP_FORTINET 5 /* Fortinet no HDLC */
#define PPP_ENCAP_MAX PPP_ENCAP_FORTINET
#define COMPR_DEFLATE (1<<0)
#define COMPR_LZS (1<<1)
#define COMPR_LZ4 (1<<2)
#define COMPR_LZO (1<<3)
#define COMPR_MAX COMPR_LZO
#ifdef HAVE_LZ4
#define COMPR_STATELESS (COMPR_LZS | COMPR_LZ4 | COMPR_LZO)
#else
#define COMPR_STATELESS (COMPR_LZS)
#endif
#define COMPR_ALL (COMPR_STATELESS | COMPR_DEFLATE)
#define DTLS_APP_ID_EXT 48018
struct keepalive_info {
int dpd;
int keepalive;
int rekey;
int rekey_method;
time_t last_rekey;
time_t last_tx;
time_t last_rx;
time_t last_dpd;
};
struct pin_cache {
struct pin_cache *next;
char *token;
char *pin;
};
struct oc_text_buf {
char *data;
int pos;
int buf_len;
int error;
};
#define TLS_MASTER_KEY_SIZE 48
#define RECONNECT_INTERVAL_MIN 10
#define RECONNECT_INTERVAL_MAX 100
#define HTTP_NO_FLAGS 0
#define HTTP_REDIRECT 1
#define HTTP_REDIRECT_TO_GET 2
#define HTTP_BODY_ON_ERROR 4
#define REDIR_TYPE_NONE 0
#define REDIR_TYPE_NEWHOST 1
#define REDIR_TYPE_LOCAL 2
#define AUTH_TYPE_GSSAPI 0
#define AUTH_TYPE_NTLM 1
#define AUTH_TYPE_DIGEST 2
#define AUTH_TYPE_BASIC 3
#define AUTH_TYPE_BEARER 4
#define MAX_AUTH_TYPES 5
#define AUTH_DEFAULT_DISABLED -3
#define AUTH_DISABLED -2
#define AUTH_FAILED -1 /* Failed */
#define AUTH_UNSEEN 0 /* Server has not offered it */
#define AUTH_AVAILABLE 1 /* Server has offered it, we have not tried it */
/* Individual auth types may use 2 onwards for their own state */
#define AUTH_IN_PROGRESS 2 /* In-progress attempt */
struct http_auth_state {
int state;
char *challenge;
union {
#ifdef HAVE_GSSAPI
struct {
gss_name_t gss_target_name;
gss_ctx_id_t gss_context;
};
#endif
#ifdef _WIN32
struct {
CredHandle ntlm_sspi_cred;
CtxtHandle ntlm_sspi_ctx;
};
struct {
CredHandle sspi_cred;
CtxtHandle sspi_ctx;
SEC_WCHAR *sspi_target_name;
};
#else
struct {
int ntlm_helper_fd;
};
#endif
};
};
#define TLS_OVERHEAD 5 /* packet + header */
#define DTLS_OVERHEAD (1 /* packet + header */ + 13 /* DTLS header */ + \
20 /* biggest supported MAC (SHA1) */ + 32 /* biggest supported IV (AES-256) */ + \
16 /* max padding */)
struct esp {
#if defined(OPENCONNECT_GNUTLS)
gnutls_cipher_hd_t cipher;
gnutls_hmac_hd_t hmac;
#elif defined(OPENCONNECT_OPENSSL)
HMAC_CTX *hmac;
EVP_CIPHER_CTX *cipher;
#endif
uint64_t seq_backlog;
uint64_t seq;
uint32_t spi; /* Stored network-endian */
unsigned char enc_key[0x40]; /* Encryption key */
unsigned char hmac_key[0x40]; /* HMAC key */
unsigned char iv[16];
};
struct oc_pcsc_ctx;
struct oc_tpm1_ctx;
struct oc_tpm2_ctx;
struct openconnect_info;
struct cert_info {
struct openconnect_info *vpninfo;
char *cert;
char *key;
char *password;
#if defined(OPENCONNECT_GNUTLS) && defined(HAVE_TROUSERS)
struct oc_tpm1_ctx *tpm1;
#endif
#if defined(OPENCONNECT_GNUTLS) && defined (HAVE_TSS2)
struct oc_tpm2_ctx *tpm2;
#endif
};
struct pkt_q {
struct pkt *head;
struct pkt **tail;
int count;
};
struct vpn_proto;
struct openconnect_info {
const struct vpn_proto *proto;
#ifdef HAVE_ICONV
iconv_t ic_legacy_to_utf8;
iconv_t ic_utf8_to_legacy;
#endif
char *redirect_url;
int redirect_type;
unsigned char esp_hmac;
unsigned char esp_enc;
unsigned char esp_compr;
uint32_t esp_replay_protect;
uint32_t esp_lifetime_bytes;
uint32_t esp_lifetime_seconds;
uint32_t esp_ssl_fallback;
int current_esp_in;
int old_esp_maxseq;
struct esp esp_in[2];
struct esp esp_out;
int enc_key_len;
int hmac_key_len;
int hmac_out_len;
int esp_magic_af;
unsigned char esp_magic[16]; /* GlobalProtect magic ping address (network-endian) */
struct oc_ppp *ppp;
struct oc_text_buf *ppp_tls_connect_req;
struct oc_text_buf *ppp_dtls_connect_req;
int tncc_fd; /* For Juniper TNCC */
char *platname;
char *mobile_platform_version;
char *mobile_device_type;
char *mobile_device_uniqueid;
char *csd_token;
char *csd_ticket;
char *csd_stuburl;
char *csd_starturl;
char *csd_waiturl;
char *csd_preurl;
char *csd_scriptname;
xmlNode *opaque_srvdata;
char *profile_url;
char *profile_sha1;
#ifdef LIBPROXY_HDR
pxProxyFactory *proxy_factory;
#endif
char *proxy_type;
char *proxy;
int proxy_port;
int proxy_fd;
char *proxy_user;
char *proxy_pass;
char *bearer_token;
int proxy_close_during_auth;
int retry_on_auth_fail;
int try_http_auth;
struct http_auth_state http_auth[MAX_AUTH_TYPES];
struct http_auth_state proxy_auth[MAX_AUTH_TYPES];
char *localname;
char *hostname; /* This is the original hostname (or IP address)
* we were asked to connect to */
char *unique_hostname; /* This is the IP address of the actual host
* that we connected to; the result of the
* DNS lookup. We do this so that we can be
* sure we reconnect to the same server we
* authenticated to. */
int port;
char *urlpath;
/* The application might ask us to recreate a connection URL,
* and we own the string so cache it for later freeing. */
struct oc_text_buf *connect_urlbuf;
int cert_expire_warning;
struct cert_info certinfo[1];
char *cafile;
unsigned no_system_trust;
const char *xmlconfig;
char xmlsha1[(SHA1_SIZE * 2) + 1];
char *authgroup;
int nopasswd;
int xmlpost;
char *dtls_ciphers;
char *dtls12_ciphers;
char *csd_wrapper;
int trojan_interval;
time_t last_trojan;
int no_http_keepalive;
int dump_http_traffic;
int token_mode;
int token_bypassed;
int token_tries;
time_t token_time;
#ifdef HAVE_LIBSTOKEN
struct stoken_ctx *stoken_ctx;
char *stoken_pin;
int stoken_concat_pin;
int stoken_interval;
#endif
#ifdef HAVE_LIBPSKC
pskc_t *pskc;
pskc_key_t *pskc_key;
#endif
char *oath_secret;
size_t oath_secret_len;
enum {
OATH_ALG_HMAC_SHA1 = 0,
OATH_ALG_HMAC_SHA256,
OATH_ALG_HMAC_SHA512,
} oath_hmac_alg;
enum {
HOTP_SECRET_BASE32 = 1,
HOTP_SECRET_RAW,
HOTP_SECRET_HEX,
HOTP_SECRET_PSKC,
} hotp_secret_format; /* We need to give it back in the same form */
#ifdef HAVE_LIBPCSCLITE
struct oc_pcsc_ctx *pcsc;
unsigned char yubikey_pwhash[16];
#endif
openconnect_lock_token_vfn lock_token;
openconnect_unlock_token_vfn unlock_token;
void *tok_cbdata;
void *peer_cert;
/* The SHA1 and SHA256 hashes of the peer's public key */
uint8_t peer_cert_sha1_raw[SHA1_SIZE];
uint8_t peer_cert_sha256_raw[SHA256_SIZE];
/* this value is cache for openconnect_get_peer_cert_hash */
char *peer_cert_hash;
void *cert_list_handle;
int cert_list_size;
char *cookie; /* Pointer to within cookies list */
struct oc_vpn_option *cookies;
struct oc_vpn_option *cstp_options;
struct oc_vpn_option *dtls_options;
struct oc_vpn_option *script_env;
struct oc_vpn_option *csd_env;
unsigned pfs;
unsigned no_tls13;
unsigned allow_insecure_crypto; /* Allow 3DES and RC4 (known-insecure, but the best that some ancient servers can do) */
#if defined(OPENCONNECT_OPENSSL)
#ifdef HAVE_LIBP11
PKCS11_CTX *pkcs11_ctx;
PKCS11_SLOT *pkcs11_slot_list;
unsigned int pkcs11_slot_count;
PKCS11_SLOT *pkcs11_cert_slot;
unsigned char *pkcs11_cert_id;
size_t pkcs11_cert_id_len;
#endif
X509 *cert_x509;
SSL_CTX *https_ctx;
SSL *https_ssl;
BIO_METHOD *ttls_bio_meth;
#elif defined(OPENCONNECT_GNUTLS)
gnutls_session_t https_sess;
gnutls_session_t eap_ttls_sess;
gnutls_certificate_credentials_t https_cred;
gnutls_psk_client_credentials_t psk_cred;
char local_cert_md5[MD5_SIZE * 2 + 1]; /* For CSD */
#endif /* OPENCONNECT_GNUTLS */
char *ciphersuite_config;
struct oc_text_buf *ttls_pushbuf;
uint8_t ttls_eap_ident;
unsigned char *ttls_recvbuf;
int ttls_recvpos;
int ttls_recvlen;
uint32_t ttls_msgleft;
struct pin_cache *pin_cache;
struct keepalive_info ssl_times;
int owe_ssl_dpd_response;
int deflate_pkt_size; /* It may need to be larger than MTU */
struct pkt *deflate_pkt; /* For compressing outbound packets into */
struct pkt *pending_deflated_pkt; /* The original packet associated with above */
struct pkt *current_ssl_pkt; /* Partially sent SSL packet */
int partial_rec_size; /* For tracking partially-received packets */
/* Packet buffers for receiving into */
struct pkt *cstp_pkt;
struct pkt *dtls_pkt;
struct pkt *tun_pkt;
int pkt_trailer; /* How many bytes after payload for encryption (ESP HMAC) */
z_stream inflate_strm;
uint32_t inflate_adler32;
z_stream deflate_strm;
uint32_t deflate_adler32;
int disable_ipv6;
int reconnect_timeout;
int reconnect_interval;
int dtls_attempt_period;
time_t auth_expiration;
time_t new_dtls_started;
#if defined(OPENCONNECT_OPENSSL)
SSL_CTX *dtls_ctx;
SSL *dtls_ssl;
#elif defined(OPENCONNECT_GNUTLS)
/* Call this dtls_ssl rather than dtls_sess because it's just a
pointer, and generic code in dtls.c wants to check if it's
NULL or not or pass it to DTLS_SEND/DTLS_RECV. This way we
have fewer ifdefs and accessor macros for it. */
gnutls_session_t dtls_ssl;
#endif
char *cstp_cipher; /* library-dependent description of TLS cipher */
char *dtls_cipher_desc; /* library-dependent description of DTLS cipher, cached for openconnect_get_dtls_cipher() */
int dtls_state;
int dtls_need_reconnect;
int tcp_blocked_for_udp; /* Some protocols explicitly *tell* the server
* over the TCP channel to switch to UDP. */
struct keepalive_info dtls_times;
unsigned char dtls_session_id[32];
unsigned char dtls_secret[TLS_MASTER_KEY_SIZE];
unsigned char dtls_app_id[32];
unsigned dtls_app_id_size;
uint32_t ift_seq;
int dtls12; /* For PPP protocols with anonymous DTLS, this being zero indicates that
* the server *cannot* handle DTLSv1.2 and we mustn't even try to negotiate
* it (e.g. F5 BIG-IP v15 and lower). If it's 1, we can try anything;
* even DTLSv1.3.
*
* For AnyConnect, it means the Cisco server sent the X-DTLS12-CipherSuite
* header, rather than X-DTLS-CipherSuite which indicates their DTLSv0.9.
*/
char *dtls_cipher; /* Only set for AnyConnect. Defines the session to be "resumed"
* ("PSK-NEGOTIATE", or an OpenSSL cipher name). */
char *vpnc_script;
#ifndef _WIN32
int uid_csd_given;
uid_t uid_csd;
gid_t gid_csd;
uid_t uid;
gid_t gid;
#endif
int use_tun_script;
int script_tun;
char *ifname;
char *cmd_ifname;
int reqmtu, basemtu; /* Local static configured values */
const char *banner;
struct oc_ip_info ip_info;
int cstp_basemtu; /* Returned by server */
int idle_timeout; /* Returned by server */
#ifdef _WIN32
long dtls_monitored, ssl_monitored, cmd_monitored, tun_monitored;
HANDLE dtls_event, ssl_event, cmd_event;
#else
int _select_nfds;
fd_set _select_rfds;
fd_set _select_wfds;
fd_set _select_efds;
#ifdef HAVE_EPOLL
int epoll_fd;
int epoll_update;
uint32_t tun_epoll, ssl_epoll, dtls_epoll, cmd_epoll;
#ifdef HAVE_VHOST
uint32_t vhost_call_epoll;
#endif
#endif
#endif
#ifdef __sun__
int ip_fd;
int ip6_fd;
#endif
#ifdef HAVE_VHOST
int vhost_ring_size;
int vhost_fd, vhost_call_fd, vhost_kick_fd;
struct oc_vring tx_vring, rx_vring;
#endif
#ifdef _WIN32
HMODULE wintun;
wchar_t *ifname_w;
WINTUN_ADAPTER_HANDLE wintun_adapter;
WINTUN_SESSION_HANDLE wintun_session;
HANDLE tun_fh;
OVERLAPPED tun_rd_overlap, tun_wr_overlap;
int tun_idx, tun_rd_pending;
#else
int tun_fd;
#endif
int ssl_fd;
int dtls_fd;
int dtls_tos_current;
int dtls_pass_tos;
int dtls_tos_proto, dtls_tos_optname;
/* An optimisation for the case where our own code is the only
* thing that *could* write to the cmd_fd, to avoid constantly
* polling on it while we're busy shovelling packets. */
int need_poll_cmd_fd;
int cmd_fd_internal;
int cmd_fd;
int cmd_fd_write;
int got_cancel_cmd;
int got_pause_cmd;
char cancel_type;
struct pkt_q free_queue;
struct pkt_q incoming_queue;
struct pkt_q outgoing_queue;
struct pkt_q tcp_control_queue; /* Control packets to be sent via TCP */
int max_qlen;
struct oc_stats stats;
openconnect_stats_vfn stats_handler;
socklen_t peer_addrlen;
struct sockaddr *peer_addr;
struct sockaddr *dtls_addr;
int dtls_local_port;
int req_compr; /* What we requested */
int cstp_compr; /* Accepted for CSTP */
int dtls_compr; /* Accepted for DTLS */
int is_dyndns; /* Attempt to redo DNS lookup on each CSTP reconnect */
char *useragent;
char *version_string;
const char *quit_reason;
const char *delay_tunnel_reason; /* If non-null, provides a reason why protocol is not yet ready for tunnel setup */
enum {
NO_DELAY_CLOSE = 0,
DELAY_CLOSE_WAIT,
DELAY_CLOSE_IMMEDIATE_CALLBACK,
} delay_close; /* Delay close of mainloop */
int verbose;
void *cbdata;
openconnect_validate_peer_cert_vfn validate_peer_cert;
openconnect_write_new_config_vfn write_new_config;
openconnect_process_auth_form_vfn process_auth_form;
openconnect_progress_vfn progress;
openconnect_protect_socket_vfn protect_socket;
openconnect_getaddrinfo_vfn getaddrinfo_override;
openconnect_setup_tun_vfn setup_tun;
openconnect_reconnected_vfn reconnected;
int (*ssl_read)(struct openconnect_info *vpninfo, char *buf, size_t len);
int (*ssl_gets)(struct openconnect_info *vpninfo, char *buf, size_t len);
int (*ssl_write)(struct openconnect_info *vpninfo, char *buf, size_t len);
};
struct vpn_proto {
const char *name;
const char *pretty_name;
const char *description;
const char *secure_cookie;
const char *udp_protocol;
int proto;
unsigned int flags;
int (*vpn_close_session)(struct openconnect_info *vpninfo, const char *reason);
/* This does the full authentication, calling back as appropriate */
int (*obtain_cookie)(struct openconnect_info *vpninfo);
/* Establish the TCP connection (and obtain configuration) */
int (*tcp_connect)(struct openconnect_info *vpninfo);
int (*tcp_mainloop)(struct openconnect_info *vpninfo, int *timeout, int readable);
/* Add headers common to each HTTP request */
void (*add_http_headers)(struct openconnect_info *vpninfo, struct oc_text_buf *buf);
/* Set up the UDP (DTLS) connection. Doesn't actually *start* it. */
int (*udp_setup)(struct openconnect_info *vpninfo);
/* This will actually complete the UDP connection setup/handshake on the wire,
as well as transporting packets */
int (*udp_mainloop)(struct openconnect_info *vpninfo, int *timeout, int readable);
/* Close the connection but leave the session setup so it restarts */
void (*udp_close)(struct openconnect_info *vpninfo);
/* Close and destroy the (UDP) session */
void (*udp_shutdown)(struct openconnect_info *vpninfo);
/* Send probe packets to start or maintain the (UDP) session */
int (*udp_send_probes)(struct openconnect_info *vpninfo);
/* Catch probe packet confirming the (UDP) session */
int (*udp_catch_probe)(struct openconnect_info *vpninfo, struct pkt *p);
};
static inline struct pkt *dequeue_packet(struct pkt_q *q)
{
struct pkt *ret = q->head;
if (ret) {
struct pkt *next = ret->next;
if (!--q->count)
q->tail = &q->head;
q->head = next;
}
return ret;
}
static inline void requeue_packet(struct pkt_q *q, struct pkt *p)
{
p->next = q->head;
q->head = p;
if (!q->count++)
q->tail = &p->next;
}
static inline int queue_packet(struct pkt_q *q, struct pkt *p)
{
*(q->tail) = p;
p->next = NULL;
q->tail = &p->next;
return ++q->count;
}
static inline void init_pkt_queue(struct pkt_q *q)
{
q->tail = &q->head;
}
static inline struct pkt *alloc_pkt(struct openconnect_info *vpninfo, int len)
{
int alloc_len = sizeof(struct pkt) + len;
if (vpninfo->free_queue.head &&
vpninfo->free_queue.head->alloc_len >= alloc_len)
return dequeue_packet(&vpninfo->free_queue);
if (alloc_len < 2048)
alloc_len = 2048;
struct pkt *pkt = malloc(alloc_len);
if (pkt)
pkt->alloc_len = alloc_len;
return pkt;
}
static inline void free_pkt(struct openconnect_info *vpninfo, struct pkt *pkt)
{
if (!pkt)
return;
if (vpninfo->free_queue.count < vpninfo->max_qlen * 2)
requeue_packet(&vpninfo->free_queue, pkt);
else
free(pkt);
}
#define vpn_progress(_v, lvl, ...) do { \
if ((_v)->verbose >= (lvl)) \
(_v)->progress((_v)->cbdata, lvl, __VA_ARGS__); \
} while(0)
#define vpn_perror(vpninfo, msg) vpn_progress((vpninfo), PRG_ERR, "%s: %s\n", (msg), strerror(errno))
#ifdef _WIN32
#define monitor_read_fd(_v, _n) (_v->_n##_monitored |= FD_READ)
#define monitor_write_fd(_v, _n) (_v->_n##_monitored |= FD_WRITE)
#define monitor_except_fd(_v, _n) (_v->_n##_monitored |= FD_CLOSE)
#define unmonitor_read_fd(_v, _n) (_v->_n##_monitored &= ~FD_READ)
#define unmonitor_write_fd(_v, _n) (_v->_n##_monitored &= ~FD_WRITE)
#define unmonitor_except_fd(_v, _n) (_v->_n##_monitored &= ~FD_CLOSE)
#define monitor_fd_new(_v, _n) do { if (!_v->_n##_event) _v->_n##_event = CreateEvent(NULL, FALSE, FALSE, NULL); } while (0)
#define read_fd_monitored(_v, _n) (_v->_n##_monitored & FD_READ)
#define __unmonitor_fd(_v, _n) do { CloseHandle(_v->_n##_event); \
_v->_n##_event = (HANDLE)0; \
} while(0)
#else
#ifdef HAVE_EPOLL
static inline void __sync_epoll_fd(struct openconnect_info *vpninfo, int fd, uint32_t *fd_evts)
{
if (vpninfo->epoll_fd >= 0 && fd >= 0) {
struct epoll_event ev = { 0 };
ev.data.fd = fd;
if (FD_ISSET(fd, &vpninfo->_select_rfds))
ev.events |= EPOLLIN;
if (FD_ISSET(fd, &vpninfo->_select_wfds))
ev.events |= EPOLLOUT;
if (ev.events != *fd_evts) {
if (epoll_ctl(vpninfo->epoll_fd, EPOLL_CTL_MOD, fd, &ev)) {
vpn_perror(vpninfo, "EPOLL_CTL_MOD");
close(vpninfo->epoll_fd);
vpninfo->epoll_fd = -1;
}
*fd_evts = ev.events;
}
}
}
#define update_epoll_fd(_v, _n) __sync_epoll_fd(_v, _v->_n##_fd, &_v->_n##_epoll)
static inline void __remove_epoll_fd(struct openconnect_info *vpninfo, int fd)
{
struct epoll_event ev = { 0 };
if (vpninfo->epoll_fd >= 0 &&
epoll_ctl(vpninfo->epoll_fd, EPOLL_CTL_DEL, fd, &ev) < 0)
vpn_perror(vpninfo, "EPOLL_CTL_DEL");
/* No other action on error; if it truly matters we'll bail
* later and fall back to select() */
}
#define __unmonitor_fd(_v, _n) do { \
__remove_epoll_fd(_v, _v->_n##_fd); \
_v->_n##_epoll = 0; } while(0)
#else /* !HAVE_POLL */
#define __unmonitor_fd(_v, _n) do { } while(0)
#endif
static inline void __monitor_fd_event(struct openconnect_info *vpninfo,
int fd, fd_set *set)
{
if (fd < 0 || FD_ISSET(fd, set))
return;
FD_SET(fd, set);
#ifdef HAVE_EPOLL
vpninfo->epoll_update = 1;
#endif
}
static inline void __unmonitor_fd_event(struct openconnect_info *vpninfo,
int fd, fd_set *set)
{
if (fd < 0 || !FD_ISSET(fd, set))
return;
FD_CLR(fd, set);
#ifdef HAVE_EPOLL
vpninfo->epoll_update = 1;
#endif
}
#define monitor_read_fd(_v, _n) __monitor_fd_event(_v, _v->_n##_fd, &_v->_select_rfds)
#define unmonitor_read_fd(_v, _n) __unmonitor_fd_event(_v, _v->_n##_fd, &_v->_select_rfds)
#define monitor_write_fd(_v, _n) __monitor_fd_event(_v, _v->_n##_fd, &_v->_select_wfds)
#define unmonitor_write_fd(_v, _n) __unmonitor_fd_event(_v, _v->_n##_fd, &_v->_select_wfds)
#define monitor_except_fd(_v, _n) __monitor_fd_event(_v, _v->_n##_fd, &_v->_select_efds)
#define unmonitor_except_fd(_v, _n) __unmonitor_fd_event(_v, _v->_n##_fd, &_v->_select_efds)
static inline void __monitor_fd_new(struct openconnect_info *vpninfo,
int fd)
{
if (vpninfo->_select_nfds <= fd)
vpninfo->_select_nfds = fd + 1;
#ifdef HAVE_EPOLL
if (vpninfo->epoll_fd >= 0) {
struct epoll_event ev = { 0 };
ev.data.fd = fd;
if (epoll_ctl(vpninfo->epoll_fd, EPOLL_CTL_ADD, fd, &ev)) {
vpn_perror(vpninfo, "EPOLL_CTL_ADD");
close(vpninfo->epoll_fd);
vpninfo->epoll_fd = -1;
}
}
#endif
}
#define monitor_fd_new(_v, _n) __monitor_fd_new(_v, _v->_n##_fd)
#define read_fd_monitored(_v, _n) FD_ISSET(_v->_n##_fd, &_v->_select_rfds)
#endif /* !WIN32 */
/* This is for all platforms */