/
ssl.c
1267 lines (1109 loc) · 31.2 KB
/
ssl.c
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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2008-2015 Intel Corporation.
*
* 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.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>
#if defined(__linux__) || defined(__ANDROID__)
#include <sys/vfs.h>
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__APPLE__)
#include <sys/param.h>
#include <sys/mount.h>
#elif defined(__sun__) || defined(__NetBSD__) || defined(__DragonFly__)
#include <sys/statvfs.h>
#elif defined(__GNU__)
#include <sys/statfs.h>
#endif
/* setsockopt and TCP_NODELAY */
#ifndef _WIN32
#include <netinet/tcp.h>
#include <sys/socket.h>
#endif
#include "openconnect-internal.h"
#ifdef ANDROID_KEYSTORE
#include <sys/un.h>
#endif
/* OSX < 1.6 doesn't have AI_NUMERICSERV */
#ifndef AI_NUMERICSERV
#define AI_NUMERICSERV 0
#endif
/* GNU Hurd doesn't yet declare IPV6_TCLASS */
#ifndef IPV6_TCLASS
#if defined(__GNU__)
#define IPV6_TCLASS 61
#elif defined(__APPLE__)
#define IPV6_TCLASS 36
#endif
#endif
static inline int connect_pending()
{
#ifdef _WIN32
return WSAGetLastError() == WSAEWOULDBLOCK;
#else
return errno == EINPROGRESS;
#endif
}
/* Windows is interminably horrid, and has disjoint errno spaces.
* So if we return a positive value, that's a WSA Error and should
* be handled with openconnect__win32_strerror(). But if we return a
* negative value, that's a normal errno and should be handled with
* strerror(). No, you can't just pass the latter value (negated) to
* openconnect__win32_strerror() because it gives nonsense results. */
static int cancellable_connect(struct openconnect_info *vpninfo, int sockfd,
const struct sockaddr *addr, socklen_t addrlen)
{
struct sockaddr_storage peer;
socklen_t peerlen = sizeof(peer);
fd_set wr_set, rd_set, ex_set;
int maxfd = sockfd;
int err;
if (set_sock_nonblock(sockfd))
goto sockerr;
if (vpninfo->protect_socket)
vpninfo->protect_socket(vpninfo->cbdata, sockfd);
if (connect(sockfd, addr, addrlen) < 0 && !connect_pending()) {
sockerr:
#ifdef _WIN32
return WSAGetLastError();
#else
return -errno;
#endif
}
do {
FD_ZERO(&wr_set);
FD_ZERO(&rd_set);
FD_ZERO(&ex_set);
FD_SET(sockfd, &wr_set);
#ifdef _WIN32 /* Windows indicates failure this way, not in wr_set */
FD_SET(sockfd, &ex_set);
#endif
cmd_fd_set(vpninfo, &rd_set, &maxfd);
if (select(maxfd + 1, &rd_set, &wr_set, &ex_set, NULL) < 0 &&
errno != EINTR) {
vpn_perror(vpninfo, _("Failed select() for socket connect"));
return -EIO;
}
if (is_cancel_pending(vpninfo, &rd_set)) {
vpn_progress(vpninfo, PRG_ERR, _("Socket connect cancelled\n"));
return -EINTR;
}
} while (!FD_ISSET(sockfd, &wr_set) && !FD_ISSET(sockfd, &ex_set) &&
!vpninfo->got_pause_cmd);
/* Check whether connect() succeeded or failed by using
getpeername(). See http://cr.yp.to/docs/connect.html */
if (!getpeername(sockfd, (void *)&peer, &peerlen))
return 0;
#ifdef _WIN32 /* On Windows, use getsockopt() to determine the error.
* We don't ddo this on Windows because it just reports
* -ENOTCONN, which we already knew. */
err = WSAGetLastError();
if (err == WSAENOTCONN) {
socklen_t errlen = sizeof(err);
getsockopt(sockfd, SOL_SOCKET, SO_ERROR,
(void *)&err, &errlen);
}
#else
err = -errno;
if (err == -ENOTCONN) {
char ch;
if (read(sockfd, &ch, 1) < 0)
err = -errno;
/* It should *always* fail! */
}
#endif
return err;
}
/* checks whether the provided string is an IP or a hostname.
*/
unsigned string_is_hostname(const char *str)
{
struct in_addr buf;
/* We don't use inet_pton() because an IPv6 literal is likely to
be encased in []. So just check for a colon, which shouldn't
occur in hostnames anyway. */
if (!str || inet_aton(str, &buf) || strchr(str, ':'))
return 0;
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;
}
static int set_tcp_nodelay(struct openconnect_info *vpninfo, int ssl_sock)
{
int flag = 1;
if (setsockopt(ssl_sock, IPPROTO_TCP, TCP_NODELAY, (void *)(&flag), sizeof(flag)) < 0) {;
vpn_perror(vpninfo,
_("Failed setsockopt(TCP_NODELAY) on TLS socket:"));
#ifdef _WIN32
return WSAGetLastError();
#else
return -errno;
#endif
}
return 0;
}
int connect_https_socket(struct openconnect_info *vpninfo)
{
int ssl_sock = -1;
int err;
/* 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);
if (ssl_sock < 0)
#endif
{
ssl_sock = socket(vpninfo->peer_addr->sa_family, SOCK_STREAM, IPPROTO_IP);
if (ssl_sock < 0) {
#ifdef _WIN32
err = WSAGetLastError();
#else
err = -errno;
#endif
goto reconn_err;
}
set_fd_cloexec(ssl_sock);
}
set_tcp_nodelay(vpninfo, ssl_sock);
err = cancellable_connect(vpninfo, ssl_sock, vpninfo->peer_addr, vpninfo->peer_addrlen);
if (err) {
char *errstr;
reconn_err:
#ifdef _WIN32
if (err > 0)
errstr = openconnect__win32_strerror(err);
else
#endif
errstr = strerror(-err);
if (vpninfo->proxy) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to reconnect to proxy %s: %s\n"),
vpninfo->proxy, errstr);
} else {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to reconnect to host %s: %s\n"),
vpninfo->hostname, errstr);
}
#ifdef _WIN32
if (err > 0)
free(errstr);
#endif
if (ssl_sock >= 0)
closesocket(ssl_sock);
ssl_sock = -EINVAL;
goto out;
}
} else {
struct addrinfo hints, *result, *rp;
char *hostname;
char port[6];
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV;
hints.ai_protocol = 0;
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
/* The 'port' variable is a string because it's easier
this way than if we pass NULL to getaddrinfo() and
then try to fill in the numeric value into
different types of returned sockaddr_in{6,}. */
#ifdef LIBPROXY_HDR
if (vpninfo->proxy_factory) {
struct oc_text_buf *url_buf = buf_alloc();
char **proxies;
int i = 0;
free(vpninfo->proxy_type);
vpninfo->proxy_type = NULL;
free(vpninfo->proxy);
vpninfo->proxy = NULL;
buf_append(url_buf, "https://%s", vpninfo->hostname);
if (vpninfo->port != 443)
buf_append(url_buf, ":%d", vpninfo->port);
buf_append(url_buf, "/%s", vpninfo->urlpath?:"");
if (buf_error(url_buf)) {
buf_free(url_buf);
ssl_sock = -ENOMEM;
goto out;
}
proxies = px_proxy_factory_get_proxies(vpninfo->proxy_factory,
url_buf->data);
i = 0;
while (proxies && proxies[i]) {
if (!vpninfo->proxy &&
(!strncmp(proxies[i], "http://", 7) ||
!strncmp(proxies[i], "socks://", 8) ||
!strncmp(proxies[i], "socks5://", 9)))
internal_parse_url(proxies[i], &vpninfo->proxy_type,
&vpninfo->proxy, &vpninfo->proxy_port,
NULL, 0);
i++;
}
buf_free(url_buf);
free(proxies);
if (vpninfo->proxy)
vpn_progress(vpninfo, PRG_DEBUG,
_("Proxy from libproxy: %s://%s:%d/\n"),
vpninfo->proxy_type, vpninfo->proxy, vpninfo->port);
}
#endif
if (vpninfo->proxy) {
hostname = vpninfo->proxy;
snprintf(port, 6, "%d", vpninfo->proxy_port);
} else {
hostname = vpninfo->hostname;
snprintf(port, 6, "%d", vpninfo->port);
}
if (hostname[0] == '[' && hostname[strlen(hostname)-1] == ']') {
hostname = strndup(hostname + 1, strlen(hostname) - 2);
if (!hostname) {
ssl_sock = -ENOMEM;
goto out;
}
hints.ai_flags |= AI_NUMERICHOST;
}
if (vpninfo->getaddrinfo_override)
err = vpninfo->getaddrinfo_override(vpninfo->cbdata, hostname, port, &hints, &result);
else
err = getaddrinfo(hostname, port, &hints, &result);
if (err) {
vpn_progress(vpninfo, PRG_ERR,
_("getaddrinfo failed for host '%s': %s\n"),
hostname, gai_strerror(err));
if (hints.ai_flags & AI_NUMERICHOST)
free(hostname);
ssl_sock = -EINVAL;
/* 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)
free(hostname);
for (rp = result; rp ; rp = rp->ai_next) {
char host[80];
host[0] = 0;
if (!getnameinfo(rp->ai_addr, rp->ai_addrlen, host,
sizeof(host), NULL, 0, NI_NUMERICHOST))
vpn_progress(vpninfo, PRG_DEBUG, vpninfo->proxy_type ?
_("Attempting to connect to proxy %s%s%s:%s\n") :
_("Attempting to connect to server %s%s%s:%s\n"),
rp->ai_family == AF_INET6 ? "[" : "",
host,
rp->ai_family == AF_INET6 ? "]" : "",
port);
ssl_sock = socket(rp->ai_family, rp->ai_socktype,
rp->ai_protocol);
if (ssl_sock < 0)
continue;
set_fd_cloexec(ssl_sock);
set_tcp_nodelay(vpninfo, ssl_sock);
err = cancellable_connect(vpninfo, ssl_sock, rp->ai_addr, rp->ai_addrlen);
if (!err) {
/* Store the peer address we actually used, so that DTLS can
use it again later */
free(vpninfo->ip_info.gateway_addr);
vpninfo->ip_info.gateway_addr = NULL;
if (host[0]) {
vpninfo->ip_info.gateway_addr = strdup(host);
vpn_progress(vpninfo, PRG_INFO, _("Connected to %s%s%s:%s\n"),
rp->ai_family == AF_INET6 ? "[" : "",
host,
rp->ai_family == AF_INET6 ? "]" : "",
port);
}
free(vpninfo->peer_addr);
vpninfo->peer_addrlen = 0;
vpninfo->peer_addr = malloc(rp->ai_addrlen);
if (!vpninfo->peer_addr) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to allocate sockaddr storage\n"));
closesocket(ssl_sock);
ssl_sock = -ENOMEM;
freeaddrinfo(result);
goto out;
}
vpninfo->peer_addrlen = rp->ai_addrlen;
memcpy(vpninfo->peer_addr, rp->ai_addr, rp->ai_addrlen);
/* If no proxy, ensure that we output *this* IP address in
* authentication results because we're going to need to
* reconnect to the *same* server from the rotation. And with
* some trick DNS setups, it might possibly be a "rotation"
* even if we only got one result from getaddrinfo() this
* time.
*
* If there's a proxy, we're kind of screwed; we can't know
* which IP address we connected to. Perhaps we ought to do
* the DNS lookup locally and connect to a specific IP? */
if (!vpninfo->proxy && host[0]) {
char *p = malloc(strlen(host) + 3);
if (p) {
free(vpninfo->unique_hostname);
vpninfo->unique_hostname = p;
if (rp->ai_family == AF_INET6)
*p++ = '[';
memcpy(p, host, strlen(host));
p += strlen(host);
if (rp->ai_family == AF_INET6)
*p++ = ']';
*p = 0;
}
}
break;
}
if (host[0]) {
char *errstr;
#ifdef _WIN32
if (err > 0)
errstr = openconnect__win32_strerror(err);
else
#endif
errstr = strerror(-err);
vpn_progress(vpninfo, PRG_INFO, _("Failed to connect to %s%s%s:%s: %s\n"),
rp->ai_family == AF_INET6 ? "[" : "",
host,
rp->ai_family == AF_INET6 ? "]" : "",
port, errstr);
#ifdef _WIN32
if (err > 0)
free(errstr);
#endif
}
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;
free(vpninfo->ip_info.gateway_addr);
vpninfo->ip_info.gateway_addr = NULL;
}
}
freeaddrinfo(result);
if (ssl_sock < 0) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to connect to host %s\n"),
vpninfo->proxy?:vpninfo->hostname);
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;
}
}
if (vpninfo->proxy) {
err = process_proxy(vpninfo, ssl_sock);
if (err) {
closesocket(ssl_sock);
if (err == -EAGAIN) {
/* Proxy authentication failed and we need to retry */
vpn_progress(vpninfo, PRG_DEBUG,
_("Reconnecting to proxy %s\n"), vpninfo->proxy);
goto reconnect;
}
ssl_sock = err;
}
}
out:
/* If proxy processing returned -EAGAIN to reconnect before attempting
further auth, and we failed to reconnect, we have to clean up here. */
clear_auth_states(vpninfo, vpninfo->proxy_auth, 1);
return ssl_sock;
}
int __attribute__ ((format (printf, 2, 3)))
openconnect_SSL_printf(struct openconnect_info *vpninfo, const char *fmt, ...)
{
char buf[1024];
va_list args;
buf[1023] = 0;
va_start(args, fmt);
vsnprintf(buf, 1023, fmt, args);
va_end(args);
return vpninfo->ssl_write(vpninfo, buf, strlen(buf));
}
int __attribute__ ((format(printf, 4, 5)))
request_passphrase(struct openconnect_info *vpninfo, const char *label,
char **response, const char *fmt, ...)
{
struct oc_auth_form f;
struct oc_form_opt o;
char buf[1024];
va_list args;
int ret;
buf[1023] = 0;
memset(&f, 0, sizeof(f));
va_start(args, fmt);
vsnprintf(buf, 1023, fmt, args);
va_end(args);
f.auth_id = (char *)label;
f.opts = &o;
o.next = NULL;
o.type = OC_FORM_OPT_PASSWORD;
o.name = (char *)label;
o.label = buf;
o._value = NULL;
ret = process_auth_form(vpninfo, &f);
if (!ret) {
*response = o._value;
return 0;
}
return -EIO;
}
#if defined(__sun__) || defined(__NetBSD__) || defined(__DragonFly__)
int openconnect_passphrase_from_fsid(struct openconnect_info *vpninfo)
{
struct statvfs buf;
char *sslkey = openconnect_utf8_to_legacy(vpninfo, vpninfo->sslkey);
int err = 0;
if (statvfs(sslkey, &buf)) {
err = -errno;
vpn_progress(vpninfo, PRG_ERR, _("statvfs: %s\n"),
strerror(errno));
} else if (asprintf(&vpninfo->cert_password, "%lx", buf.f_fsid) == -1)
err = -ENOMEM;
if (sslkey != vpninfo->sslkey)
free(sslkey);
return err;
}
#elif defined(_WIN32)
#include <fileapi.h>
typedef BOOL WINAPI (*GVIBH)(HANDLE, LPWSTR, DWORD, LPDWORD, LPDWORD, LPDWORD, LPWSTR, DWORD);
int openconnect_passphrase_from_fsid(struct openconnect_info *vpninfo)
{
HANDLE h;
DWORD serial;
HINSTANCE kernlib;
GVIBH func = NULL;
int success;
int fd;
/* Some versions of Windows don't have this so don't use standard
load-time linking or it'll cause failures. */
kernlib = LoadLibraryA("Kernel32.dll");
if (!kernlib) {
notsupp:
vpn_progress(vpninfo, PRG_ERR,
_("Could not obtain file system ID for passphrase\n"));
return -EOPNOTSUPP;
}
func = (GVIBH)GetProcAddress(kernlib, "GetVolumeInformationByHandleW");
FreeLibrary(kernlib);
if (!func)
goto notsupp;
fd = openconnect_open_utf8(vpninfo, vpninfo->sslkey, O_RDONLY);
if (fd == -1) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to open private key file '%s': %s\n"),
vpninfo->sslkey, strerror(errno));
return -ENOENT;
}
h = (HANDLE)_get_osfhandle(fd);
success = func(h, NULL, 0, &serial, NULL, NULL, NULL, 0);
close(fd);
if (!success)
return -EIO;
if (asprintf(&vpninfo->cert_password, "%lx", serial) == -1)
return -ENOMEM;
return 0;
}
#elif defined(HAVE_STATFS)
int openconnect_passphrase_from_fsid(struct openconnect_info *vpninfo)
{
char *sslkey = openconnect_utf8_to_legacy(vpninfo, vpninfo->sslkey);
struct statfs buf;
unsigned *fsid = (unsigned *)&buf.f_fsid;
unsigned long long fsid64;
int err = 0;
if (statfs(sslkey, &buf)) {
err = -errno;
vpn_progress(vpninfo, PRG_ERR, _("statfs: %s\n"),
strerror(errno));
return -err;
} else {
fsid64 = ((unsigned long long)fsid[0] << 32) | fsid[1];
if (asprintf(&vpninfo->cert_password, "%llx", fsid64) == -1)
err = -ENOMEM;
}
if (sslkey != vpninfo->sslkey)
free(sslkey);
return err;
}
#else
int openconnect_passphrase_from_fsid(struct openconnect_info *vpninfo)
{
return -EOPNOTSUPP;
}
#endif
#if defined(OPENCONNECT_OPENSSL)
/* We put this here rather than in openssl.c because it might be needed
for OpenSSL DTLS support even when GnuTLS is being used for HTTPS */
int openconnect_print_err_cb(const char *str, size_t len, void *ptr)
{
struct openconnect_info *vpninfo = ptr;
vpn_progress(vpninfo, PRG_ERR, "%s", str);
return 0;
}
#endif
#ifdef FAKE_ANDROID_KEYSTORE
char *keystore_strerror(int err)
{
return (char *)strerror(-err);
}
int keystore_fetch(const char *key, unsigned char **result)
{
unsigned char *data;
struct stat st;
int fd;
int ret;
fd = open(key, O_RDONLY);
if (fd < 0)
return -errno;
if (fstat(fd, &st)) {
ret = -errno;
goto out_fd;
}
data = malloc(st.st_size + 1);
if (!data) {
ret = -ENOMEM;
goto out_fd;
}
if (read(fd, data, st.st_size) != st.st_size) {
ret = -EIO;
free(data);
goto out_fd;
}
data[st.st_size] = 0;
*result = data;
ret = st.st_size;
out_fd:
close(fd);
return ret;
}
#elif defined(ANDROID_KEYSTORE)
/* keystore.h isn't in the NDK so we need to define these */
#define NO_ERROR 1
#define LOCKED 2
#define UNINITIALIZED 3
#define SYSTEM_ERROR 4
#define PROTOCOL_ERROR 5
#define PERMISSION_DENIED 6
#define KEY_NOT_FOUND 7
#define VALUE_CORRUPTED 8
#define UNDEFINED_ACTION 9
#define WRONG_PASSWORD 10
const char *keystore_strerror(int err)
{
switch (-err) {
case NO_ERROR: return _("No error");
case LOCKED: return _("Keystore locked");
case UNINITIALIZED: return _("Keystore uninitialized");
case SYSTEM_ERROR: return _("System error");
case PROTOCOL_ERROR: return _("Protocol error");
case PERMISSION_DENIED: return _("Permission denied");
case KEY_NOT_FOUND: return _("Key not found");
case VALUE_CORRUPTED: return _("Value corrupted");
case UNDEFINED_ACTION: return _("Undefined action");
case WRONG_PASSWORD:
case WRONG_PASSWORD+1:
case WRONG_PASSWORD+2:
case WRONG_PASSWORD+3: return _("Wrong password");
default: return _("Unknown error");
}
}
/* Returns length, or a negative errno in its own namespace (handled by its
own strerror function above). The numbers are from Android's keystore.h */
int keystore_fetch(const char *key, unsigned char **result)
{
struct sockaddr_un sa = { AF_UNIX, "/dev/socket/keystore" };
socklen_t sl = offsetof(struct sockaddr_un, sun_path) + strlen(sa.sun_path) + 1;
unsigned char *data, *p;
unsigned char buf[3];
int len, fd;
int ret = -SYSTEM_ERROR;
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return -SYSTEM_ERROR;
if (connect(fd, (void *)&sa, sl)) {
close(fd);
return -SYSTEM_ERROR;
}
len = strlen(key);
buf[0] = 'g';
store_be16(buf + 1, len);
if (send(fd, buf, 3, 0) != 3 || send(fd, key, len, 0) != len ||
shutdown(fd, SHUT_WR) || recv(fd, buf, 1, 0) != 1)
goto out;
if (buf[0] != NO_ERROR) {
/* Should never be zero */
ret = buf[0] ? -buf[0] : -PROTOCOL_ERROR;
goto out;
}
if (recv(fd, buf, 2, 0) != 2)
goto out;
len = load_be16(buf);
data = malloc(len);
if (!data)
goto out;
p = data;
ret = len;
while (len) {
int got = recv(fd, p, len, 0);
if (got <= 0) {
free(data);
ret = -PROTOCOL_ERROR;
goto out;
}
len -= got;
p += got;
}
*result = data;
out:
close(fd);
return ret;
}
#endif
void cmd_fd_set(struct openconnect_info *vpninfo, fd_set *fds, int *maxfd)
{
if (vpninfo->cmd_fd != -1) {
FD_SET(vpninfo->cmd_fd, fds);
if (vpninfo->cmd_fd > *maxfd)
*maxfd = vpninfo->cmd_fd;
}
}
void check_cmd_fd(struct openconnect_info *vpninfo, fd_set *fds)
{
char cmd;
if (vpninfo->cmd_fd == -1 || !FD_ISSET(vpninfo->cmd_fd, fds))
return;
if (vpninfo->cmd_fd_write == -1) {
/* legacy openconnect_set_cancel_fd() users */
vpninfo->got_cancel_cmd = 1;
return;
}
#ifdef _WIN32
if (recv(vpninfo->cmd_fd, &cmd, 1, 0) != 1)
return;
#else
if (read(vpninfo->cmd_fd, &cmd, 1) != 1)
return;
#endif
switch (cmd) {
case OC_CMD_CANCEL:
case OC_CMD_DETACH:
vpninfo->got_cancel_cmd = 1;
vpninfo->cancel_type = cmd;
break;
case OC_CMD_PAUSE:
vpninfo->got_pause_cmd = 1;
break;
case OC_CMD_STATS:
if (vpninfo->stats_handler)
vpninfo->stats_handler(vpninfo->cbdata, &vpninfo->stats);
}
}
int is_cancel_pending(struct openconnect_info *vpninfo, fd_set *fds)
{
check_cmd_fd(vpninfo, fds);
return vpninfo->got_cancel_cmd || vpninfo->got_pause_cmd;
}
void poll_cmd_fd(struct openconnect_info *vpninfo, int timeout)
{
fd_set rd_set;
int maxfd = 0;
time_t expiration = time(NULL) + timeout, now = 0;
while (now < expiration && !vpninfo->got_cancel_cmd && !vpninfo->got_pause_cmd) {
struct timeval tv;
now = time(NULL);
tv.tv_sec = now >= expiration ? 0 : expiration - now;
tv.tv_usec = 0;
FD_ZERO(&rd_set);
cmd_fd_set(vpninfo, &rd_set, &maxfd);
if (select(maxfd + 1, &rd_set, NULL, NULL, &tv) < 0 &&
errno != EINTR) {
vpn_perror(vpninfo, _("Failed select() for command socket"));
}
check_cmd_fd(vpninfo, &rd_set);
}
}
#ifdef _WIN32
#include <io.h>
#include <sys/stat.h>
int openconnect_open_utf8(struct openconnect_info *vpninfo, const char *fname, int mode)
{
wchar_t *fname_w;
int nr_chars = MultiByteToWideChar(CP_UTF8, 0, fname, -1, NULL, 0);
int fd;
if (!nr_chars) {
errno = EINVAL;
return -1;
}
fname_w = malloc(nr_chars * sizeof(wchar_t));
if (!fname_w) {
errno = ENOMEM;
return -1;
}
MultiByteToWideChar(CP_UTF8, 0, fname, -1, fname_w, nr_chars);
fd = _wopen(fname_w, mode, _S_IREAD | _S_IWRITE);
free(fname_w);
return fd;
}
#else
int openconnect_open_utf8(struct openconnect_info *vpninfo, const char *fname, int mode)
{
char *legacy_fname = openconnect_utf8_to_legacy(vpninfo, fname);
int fd;
fd = open(legacy_fname, mode, 0644);
if (legacy_fname != fname)
free(legacy_fname);
return fd;
}
#endif
FILE *openconnect_fopen_utf8(struct openconnect_info *vpninfo, const char *fname,
const char *mode)
{
int fd;
int flags;
if (!strcmp(mode, "r"))
flags = O_RDONLY|O_CLOEXEC;
else if (!strcmp(mode, "rb"))
flags = O_RDONLY|O_CLOEXEC|O_BINARY;
else if (!strcmp(mode, "w"))
flags = O_WRONLY|O_CLOEXEC|O_CREAT|O_TRUNC;
else if (!strcmp(mode, "wb"))
flags = O_WRONLY|O_CLOEXEC|O_CREAT|O_TRUNC|O_BINARY;
else {
/* This should never happen, but if we forget and start using other
modes without implementing proper mode->flags conversion, complain! */
vpn_progress(vpninfo, PRG_ERR,
_("openconnect_fopen_utf8() used with unsupported mode '%s'\n"),
mode);
return NULL;
}
fd = openconnect_open_utf8(vpninfo, fname, flags);
if (fd == -1)
return NULL;
return fdopen(fd, mode);
}
ssize_t openconnect_read_file(struct openconnect_info *vpninfo, const char *fname,
char **ptr)
{
int fd, len;
struct stat st;
char *buf;
fd = openconnect_open_utf8(vpninfo, fname, O_RDONLY|O_BINARY);
if (fd < 0) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to open %s: %s\n"),
fname, strerror(errno));
return -ENOENT;
}
if (fstat(fd, &st)) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to fstat() %s: %s\n"),
fname, strerror(errno));
close(fd);
return -EIO;
}
if (st.st_size == 0) {
vpn_progress(vpninfo, PRG_INFO, _("File %s is empty\n"),
vpninfo->xmlconfig);
close(fd);
return -ENOENT;
}
if (st.st_size >= INT_MAX || st.st_size < 0) {
vpn_progress(vpninfo, PRG_INFO, _("File %s has suspicious size %zd\n"),
vpninfo->xmlconfig, (ssize_t)st.st_size);
close(fd);
return -EIO;
}
len = st.st_size;
buf = malloc(len + 1);
if (!buf) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to allocate %d bytes for %s\n"),
len + 1, fname);
close(fd);
return -ENOMEM;
}
if (read(fd, buf, len) != len) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to read %s: %s\n"),
fname, strerror(errno));
free(buf);
close(fd);
return -EIO;
}
buf[len] = 0;
close(fd);
*ptr = buf;
return len;
}