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openconnect: added upstream patch for dynamic IPs 

That requires an update to ocserv as well to advertise them.
lilik-openwrt-22.03
Nikos Mavrogiannopoulos 10 years ago
parent
5b9977c6a7
commit
9ea507c3ab
2 changed files with 115 additions and 133 deletions
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  1. +1
    -1
      net/openconnect/Makefile
  2. +114
    -132
      net/openconnect/patches/001-always-resolve-ips.patch

+ 1
- 1
net/openconnect/Makefile View File

@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=openconnect
PKG_VERSION:=7.00
PKG_RELEASE:=2
PKG_RELEASE:=3
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
PKG_SOURCE_URL:=ftp://ftp.infradead.org/pub/openconnect/


+ 114
- 132
net/openconnect/patches/001-always-resolve-ips.patch View File

@ -1,161 +1,143 @@
From 2f55fec323730a94ed49d401d93b913d85e43b65 Mon Sep 17 00:00:00 2001
From: Nikos Mavrogiannopoulos <nmav@gnutls.org>
Date: Mon, 1 Dec 2014 20:10:06 +0100
Subject: [PATCH 1/2] Re-resolve when reconnecting CSTP and the X-CSTP-DynDNS
is set by the server
That is, when reconnecting CSTP due to peer tearing the connection
down attempt to re-resolve its IP. That handles the case where
the server is using dynamic DNS and is advertising it.
[dwmw2: refactored to simplify it somewhat]
Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---
cstp.c | 3 +++
openconnect-internal.h | 1 +
ssl.c | 48 +++++++++++++++++++++++++++++++++++++++++++++++-
4 files changed, 52 insertions(+), 2 deletions(-)
diff --git a/cstp.c b/cstp.c
index b1235ef..f955b82 100644
index 3b93538..55225f4 100644
--- a/cstp.c
+++ b/cstp.c
@@ -570,7 +570,10 @@ int openconnect_make_cstp_connection(struct openconnect_info *vpninfo)
return ret;
}
-static int cstp_reconnect(struct openconnect_info *vpninfo)
+/* When dead peer is set, this function will re-attempt resolving
+ * the peer in case its IP changed.
+ */
+static int cstp_reconnect(struct openconnect_info *vpninfo, unsigned dead_peer)
{
int ret;
int timeout;
@@ -591,6 +594,16 @@ static int cstp_reconnect(struct openconnect_info *vpninfo)
timeout = vpninfo->reconnect_timeout;
interval = vpninfo->reconnect_interval;
+ /* handle cases with dynamic DNS by forcing a new resolve.
+ * The original IP is saved to retry as fallback if resolving
+ * fails.
+ */
+ if (dead_peer && vpninfo->first_peer_addr == NULL) {
+ vpninfo->first_peer_addr = vpninfo->peer_addr;
+ vpninfo->first_peer_addrlen = vpninfo->peer_addrlen;
+ vpninfo->peer_addr = NULL;
+ }
+
while ((ret = openconnect_make_cstp_connection(vpninfo))) {
if (timeout <= 0)
return ret;
@@ -611,6 +624,11 @@ static int cstp_reconnect(struct openconnect_info *vpninfo)
interval += vpninfo->reconnect_interval;
if (interval > RECONNECT_INTERVAL_MAX)
interval = RECONNECT_INTERVAL_MAX;
+
+ if (dead_peer && vpninfo->first_peer_addr != NULL) {
+ free(vpninfo->peer_addr);
+ vpninfo->peer_addr = NULL;
+ }
}
script_config_tun(vpninfo, "reconnect");
return 0;
@@ -903,8 +921,15 @@ int cstp_mainloop(struct openconnect_info *vpninfo, int *timeout)
/* Not that this will ever happen; we don't even process
the setting when we're asked for it. */
vpn_progress(vpninfo, PRG_INFO, _("CSTP rekey due\n"));
- if (vpninfo->ssl_times.rekey_method == REKEY_TUNNEL)
- goto do_reconnect;
+ if (vpninfo->ssl_times.rekey_method == REKEY_TUNNEL) {
+ ret = cstp_reconnect(vpninfo, 0);
+ if (ret) {
+ vpn_progress(vpninfo, PRG_ERR, _("Reconnect failed\n"));
+ vpninfo->quit_reason = "CSTP reconnect failed";
+ return ret;
+ }
+ goto do_dtls_reconnect;
+ }
else if (vpninfo->ssl_times.rekey_method == REKEY_SSL) {
ret = cstp_handshake(vpninfo, 0);
if (ret) {
@@ -922,7 +947,7 @@ int cstp_mainloop(struct openconnect_info *vpninfo, int *timeout)
vpn_progress(vpninfo, PRG_ERR,
_("CSTP Dead Peer Detection detected dead peer!\n"));
do_reconnect:
- ret = cstp_reconnect(vpninfo);
+ ret = cstp_reconnect(vpninfo, 1);
if (ret) {
vpn_progress(vpninfo, PRG_ERR, _("Reconnect failed\n"));
vpninfo->quit_reason = "CSTP reconnect failed";
diff --git a/library.c b/library.c
index f5d3dc9..7c8d5ec 100644
--- a/library.c
+++ b/library.c
@@ -178,6 +178,7 @@ void openconnect_vpninfo_free(struct openconnect_info *vpninfo)
CloseHandle(vpninfo->dtls_event);
#endif
free(vpninfo->peer_addr);
+ free(vpninfo->first_peer_addr);
free_optlist(vpninfo->csd_env);
free_optlist(vpninfo->script_env);
free_optlist(vpninfo->cookies);
@@ -291,6 +292,8 @@ int openconnect_set_hostname(struct openconnect_info *vpninfo,
vpninfo->unique_hostname = NULL;
free(vpninfo->peer_addr);
vpninfo->peer_addr = NULL;
+ free(vpninfo->first_peer_addr);
+ vpninfo->first_peer_addr = NULL;
return 0;
}
@@ -378,6 +378,9 @@ static int start_cstp_connection(struct openconnect_info *vpninfo)
int cstpmtu = atol(colon);
if (cstpmtu > mtu)
mtu = cstpmtu;
+ } else if (!strcmp(buf + 7, "DynDNS")) {
+ if (!strcmp(colon, "true"))
+ vpninfo->is_dyndns = 1;
} else if (!strcmp(buf + 7, "Address-IP6")) {
vpninfo->ip_info.netmask6 = new_option->value;
} else if (!strcmp(buf + 7, "Address")) {
diff --git a/openconnect-internal.h b/openconnect-internal.h
index 1bc79e5..cafbb3c 100644
index 1bc79e5..db6c2ba 100644
--- a/openconnect-internal.h
+++ b/openconnect-internal.h
@@ -424,6 +424,9 @@ struct openconnect_info {
struct sockaddr *peer_addr;
struct sockaddr *dtls_addr;
+ struct sockaddr *first_peer_addr;
+ socklen_t first_peer_addrlen;
+
@@ -427,6 +427,7 @@ struct openconnect_info {
int dtls_local_port;
int deflate;
+ int is_dyndns; /* Attempt to redo DNS lookup on each CSTP reconnect */
char *useragent;
const char *quit_reason;
diff --git a/ssl.c b/ssl.c
index b50652d..e341871 100644
index b50652d..d47a819 100644
--- a/ssl.c
+++ b/ssl.c
@@ -110,6 +110,7 @@ int connect_https_socket(struct openconnect_info *vpninfo)
@@ -106,6 +106,23 @@ unsigned string_is_hostname(const char *str)
return 1;
}
+static int match_sockaddr(struct sockaddr *a, struct sockaddr *b)
+{
+ if (a->sa_family == AF_INET) {
+ struct sockaddr_in *a4 = (void *)a;
+ struct sockaddr_in *b4 = (void *)b;
+
+ return (a4->sin_addr.s_addr == b4->sin_addr.s_addr) &&
+ (a4->sin_port == b4->sin_port);
+ } else if (a->sa_family == AF_INET6) {
+ struct sockaddr_in6 *a6 = (void *)a;
+ struct sockaddr_in6 *b6 = (void *)b;
+ return !memcmp(&a6->sin6_addr, &b6->sin6_addr, sizeof(a6->sin6_addr) &&
+ a6->sin6_port == b6->sin6_port);
+ } else
+ return 0;
+}
+
int connect_https_socket(struct openconnect_info *vpninfo)
{
int ssl_sock = -1;
int err;
+ unsigned retry_old_ip = 0;
@@ -114,7 +131,11 @@ int connect_https_socket(struct openconnect_info *vpninfo)
if (!vpninfo->port)
vpninfo->port = 443;
@@ -230,6 +231,8 @@ int connect_https_socket(struct openconnect_info *vpninfo)
- if (vpninfo->peer_addr) {
+ /* If we're talking to a server which told us it has dynamic DNS, don't
+ just re-use its previous IP address. If we're talking to a proxy, we
+ can use *its* previous IP address. We expect it'll re-do the DNS
+ lookup for the server anyway. */
+ if (vpninfo->peer_addr && (!vpninfo->is_dyndns || vpninfo->proxy)) {
reconnect:
#ifdef SOCK_CLOEXEC
ssl_sock = socket(vpninfo->peer_addr->sa_family, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_IP);
@@ -230,6 +251,13 @@ int connect_https_socket(struct openconnect_info *vpninfo)
if (hints.ai_flags & AI_NUMERICHOST)
free(hostname);
ssl_sock = -EINVAL;
+ if (vpninfo->first_peer_addr != NULL)
+ retry_old_ip = 1;
+ /* If we were just retrying for dynamic DNS, reconnct using
+ the previously-known IP address */
+ if (vpninfo->peer_addr) {
+ vpn_progress(vpninfo, PRG_ERR,
+ _("Reconnecting to DynDNS server using previously cached IP address\n"));
+ goto reconnect;
+ }
goto out;
}
if (hints.ai_flags & AI_NUMERICHOST)
@@ -291,7 +294,10 @@ int connect_https_socket(struct openconnect_info *vpninfo)
@@ -257,6 +285,8 @@ int connect_https_socket(struct openconnect_info *vpninfo)
if (cancellable_connect(vpninfo, ssl_sock, rp->ai_addr, rp->ai_addrlen) >= 0) {
/* Store the peer address we actually used, so that DTLS can
use it again later */
+ free(vpninfo->peer_addr);
+ vpninfo->peer_addrlen = 0;
vpninfo->peer_addr = malloc(rp->ai_addrlen);
if (!vpninfo->peer_addr) {
vpn_progress(vpninfo, PRG_ERR,
@@ -288,6 +318,17 @@ int connect_https_socket(struct openconnect_info *vpninfo)
}
closesocket(ssl_sock);
ssl_sock = -1;
+
+ /* If we're in DynDNS mode but this *was* the cached IP address,
+ * don't bother falling back to it if it didn't work. */
+ if (vpninfo->peer_addr && vpninfo->peer_addrlen == rp->ai_addrlen &&
+ match_sockaddr(vpninfo->peer_addr, rp->ai_addr)) {
+ vpn_progress(vpninfo, PRG_TRACE,
+ _("Forgetting non-functional previous peer address\n"));
+ free(vpninfo->peer_addr);
+ vpninfo->peer_addr = 0;
+ vpninfo->peer_addrlen = 0;
+ }
}
freeaddrinfo(result);
+
if (ssl_sock < 0) {
+ if (vpninfo->first_peer_addr != NULL)
+ retry_old_ip = 1;
vpn_progress(vpninfo, PRG_ERR,
@@ -296,6 +337,11 @@ int connect_https_socket(struct openconnect_info *vpninfo)
_("Failed to connect to host %s\n"),
vpninfo->proxy?:vpninfo->hostname);
@@ -314,6 +320,21 @@ int connect_https_socket(struct openconnect_info *vpninfo)
ssl_sock = -EINVAL;
+ if (vpninfo->peer_addr) {
+ vpn_progress(vpninfo, PRG_ERR,
+ _("Reconnecting to DynDNS server using previously cached IP address\n"));
+ goto reconnect;
+ }
goto out;
}
}
out:
+ if (retry_old_ip != 0 && vpninfo->first_peer_addr != NULL) {
+ vpn_progress(vpninfo, PRG_ERR,
+ _("Retrying connection to host %s with original IP\n"),
+ vpninfo->proxy?:vpninfo->hostname);
+
+ retry_old_ip = 0;
+ if (vpninfo->first_peer_addrlen > vpninfo->peer_addrlen || vpninfo->peer_addr == NULL)
+ realloc_inplace(vpninfo->peer_addr, vpninfo->first_peer_addrlen);
+
+ if (vpninfo->peer_addr != NULL) {
+ memcpy(vpninfo->peer_addr, vpninfo->first_peer_addr, vpninfo->first_peer_addrlen);
+ goto reconnect;
+ }
+ }
+
/* If proxy processing returned -EAGAIN to reconnect before attempting
further auth, and we failed to reconnect, we have to clean up here. */
cleanup_proxy_auth(vpninfo);
--
2.1.3

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