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connect.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2013, Daniel Stenberg, <[email protected]>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h> /* <netinet/tcp.h> may need it */
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h> /* for sockaddr_un */
#endif
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h> /* for TCP_NODELAY */
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if (defined(HAVE_IOCTL_FIONBIO) && defined(NETWARE))
#include <sys/filio.h>
#endif
#ifdef NETWARE
#undef in_addr_t
#define in_addr_t unsigned long
#endif
#ifdef __VMS
#include <in.h>
#include <inet.h>
#endif
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#include "urldata.h"
#include "sendf.h"
#include "if2ip.h"
#include "strerror.h"
#include "connect.h"
#include "curl_memory.h"
#include "select.h"
#include "url.h" /* for Curl_safefree() */
#include "multiif.h"
#include "sockaddr.h" /* required for Curl_sockaddr_storage */
#include "inet_ntop.h"
#include "inet_pton.h"
#include "sslgen.h" /* for Curl_ssl_check_cxn() */
#include "progress.h"
#include "warnless.h"
#include "conncache.h"
#include "multihandle.h"
/* The last #include file should be: */
#include "memdebug.h"
#ifdef __SYMBIAN32__
/* This isn't actually supported under Symbian OS */
#undef SO_NOSIGPIPE
#endif
static bool verifyconnect(curl_socket_t sockfd, int *error);
#if defined(__DragonFly__) || defined(HAVE_WINSOCK_H)
/* DragonFlyBSD and Windows use millisecond units */
#define KEEPALIVE_FACTOR(x) (x *= 1000)
#else
#define KEEPALIVE_FACTOR(x)
#endif
#if defined(HAVE_WINSOCK_H) && !defined(SIO_KEEPALIVE_VALS)
#define SIO_KEEPALIVE_VALS _WSAIOW(IOC_VENDOR,4)
struct tcp_keepalive {
u_long onoff;
u_long keepalivetime;
u_long keepaliveinterval;
};
#endif
static void
tcpkeepalive(struct SessionHandle *data,
curl_socket_t sockfd)
{
int optval = data->set.tcp_keepalive?1:0;
/* only set IDLE and INTVL if setting KEEPALIVE is successful */
if(setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE,
(void *)&optval, sizeof(optval)) < 0) {
infof(data, "Failed to set SO_KEEPALIVE on fd %d\n", sockfd);
}
else {
#if defined(SIO_KEEPALIVE_VALS)
struct tcp_keepalive vals;
DWORD dummy;
vals.onoff = 1;
optval = curlx_sltosi(data->set.tcp_keepidle);
KEEPALIVE_FACTOR(optval);
vals.keepalivetime = optval;
optval = curlx_sltosi(data->set.tcp_keepintvl);
KEEPALIVE_FACTOR(optval);
vals.keepaliveinterval = optval;
if(WSAIoctl(sockfd, SIO_KEEPALIVE_VALS, (LPVOID) &vals, sizeof(vals),
NULL, 0, &dummy, NULL, NULL) != 0) {
infof(data, "Failed to set SIO_KEEPALIVE_VALS on fd %d: %d\n",
(int)sockfd, WSAGetLastError());
}
#else
#ifdef TCP_KEEPIDLE
optval = curlx_sltosi(data->set.tcp_keepidle);
KEEPALIVE_FACTOR(optval);
if(setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPIDLE,
(void *)&optval, sizeof(optval)) < 0) {
infof(data, "Failed to set TCP_KEEPIDLE on fd %d\n", sockfd);
}
#endif
#ifdef TCP_KEEPINTVL
optval = curlx_sltosi(data->set.tcp_keepintvl);
KEEPALIVE_FACTOR(optval);
if(setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPINTVL,
(void *)&optval, sizeof(optval)) < 0) {
infof(data, "Failed to set TCP_KEEPINTVL on fd %d\n", sockfd);
}
#endif
#ifdef TCP_KEEPALIVE
/* Mac OS X style */
optval = curlx_sltosi(data->set.tcp_keepidle);
KEEPALIVE_FACTOR(optval);
if(setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPALIVE,
(void *)&optval, sizeof(optval)) < 0) {
infof(data, "Failed to set TCP_KEEPALIVE on fd %d\n", sockfd);
}
#endif
#endif
}
}
static CURLcode
singleipconnect(struct connectdata *conn,
const Curl_addrinfo *ai, /* start connecting to this */
curl_socket_t *sock,
bool *connected);
/*
* Curl_timeleft() returns the amount of milliseconds left allowed for the
* transfer/connection. If the value is negative, the timeout time has already
* elapsed.
*
* The start time is stored in progress.t_startsingle - as set with
* Curl_pgrsTime(..., TIMER_STARTSINGLE);
*
* If 'nowp' is non-NULL, it points to the current time.
* 'duringconnect' is FALSE if not during a connect, as then of course the
* connect timeout is not taken into account!
*
* @unittest: 1303
*/
long Curl_timeleft(struct SessionHandle *data,
struct timeval *nowp,
bool duringconnect)
{
int timeout_set = 0;
long timeout_ms = duringconnect?DEFAULT_CONNECT_TIMEOUT:0;
struct timeval now;
/* if a timeout is set, use the most restrictive one */
if(data->set.timeout > 0)
timeout_set |= 1;
if(duringconnect && (data->set.connecttimeout > 0))
timeout_set |= 2;
switch (timeout_set) {
case 1:
timeout_ms = data->set.timeout;
break;
case 2:
timeout_ms = data->set.connecttimeout;
break;
case 3:
if(data->set.timeout < data->set.connecttimeout)
timeout_ms = data->set.timeout;
else
timeout_ms = data->set.connecttimeout;
break;
default:
/* use the default */
if(!duringconnect)
/* if we're not during connect, there's no default timeout so if we're
at zero we better just return zero and not make it a negative number
by the math below */
return 0;
break;
}
if(!nowp) {
now = Curl_tvnow();
nowp = &now;
}
/* subtract elapsed time */
timeout_ms -= Curl_tvdiff(*nowp, data->progress.t_startsingle);
if(!timeout_ms)
/* avoid returning 0 as that means no timeout! */
return -1;
return timeout_ms;
}
/*
* checkconnect() checks for a TCP connect on the given socket.
* It returns:
*/
enum chkconn_t {
CHKCONN_SELECT_ERROR = -1,
CHKCONN_CONNECTED = 0,
CHKCONN_IDLE = 1,
CHKCONN_FDSET_ERROR = 2
};
static enum chkconn_t
checkconnect(curl_socket_t sockfd)
{
int rc;
#ifdef mpeix
/* Call this function once now, and ignore the results. We do this to
"clear" the error state on the socket so that we can later read it
reliably. This is reported necessary on the MPE/iX operating system. */
(void)verifyconnect(sockfd, NULL);
#endif
rc = Curl_socket_ready(CURL_SOCKET_BAD, sockfd, 0);
if(-1 == rc)
/* error, no connect here, try next */
return CHKCONN_SELECT_ERROR;
else if(rc & CURL_CSELECT_ERR)
/* error condition caught */
return CHKCONN_FDSET_ERROR;
else if(rc)
return CHKCONN_CONNECTED;
return CHKCONN_IDLE;
}
static CURLcode bindlocal(struct connectdata *conn,
curl_socket_t sockfd, int af)
{
struct SessionHandle *data = conn->data;
struct Curl_sockaddr_storage sa;
struct sockaddr *sock = (struct sockaddr *)&sa; /* bind to this address */
curl_socklen_t sizeof_sa = 0; /* size of the data sock points to */
struct sockaddr_in *si4 = (struct sockaddr_in *)&sa;
#ifdef ENABLE_IPV6
struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)&sa;
#endif
struct Curl_dns_entry *h=NULL;
unsigned short port = data->set.localport; /* use this port number, 0 for
"random" */
/* how many port numbers to try to bind to, increasing one at a time */
int portnum = data->set.localportrange;
const char *dev = data->set.str[STRING_DEVICE];
int error;
char myhost[256] = "";
int done = 0; /* -1 for error, 1 for address found */
bool is_interface = FALSE;
bool is_host = FALSE;
static const char *if_prefix = "if!";
static const char *host_prefix = "host!";
/*************************************************************
* Select device to bind socket to
*************************************************************/
if(!dev && !port)
/* no local kind of binding was requested */
return CURLE_OK;
memset(&sa, 0, sizeof(struct Curl_sockaddr_storage));
if(dev && (strlen(dev)<255) ) {
if(strncmp(if_prefix, dev, strlen(if_prefix)) == 0) {
dev += strlen(if_prefix);
is_interface = TRUE;
}
else if(strncmp(host_prefix, dev, strlen(host_prefix)) == 0) {
dev += strlen(host_prefix);
is_host = TRUE;
}
/* interface */
if(!is_host) {
switch(Curl_if2ip(af, conn->scope, dev, myhost, sizeof(myhost))) {
case IF2IP_NOT_FOUND:
if(is_interface) {
/* Do not fall back to treating it as a host name */
failf(data, "Couldn't bind to interface '%s'", dev);
return CURLE_INTERFACE_FAILED;
}
break;
case IF2IP_AF_NOT_SUPPORTED:
/* Signal the caller to try another address family if available */
return CURLE_UNSUPPORTED_PROTOCOL;
case IF2IP_FOUND:
is_interface = TRUE;
/*
* We now have the numerical IP address in the 'myhost' buffer
*/
infof(data, "Local Interface %s is ip %s using address family %i\n",
dev, myhost, af);
done = 1;
#ifdef SO_BINDTODEVICE
/* I am not sure any other OSs than Linux that provide this feature,
* and at the least I cannot test. --Ben
*
* This feature allows one to tightly bind the local socket to a
* particular interface. This will force even requests to other
* local interfaces to go out the external interface.
*
*
* Only bind to the interface when specified as interface, not just
* as a hostname or ip address.
*/
if(setsockopt(sockfd, SOL_SOCKET, SO_BINDTODEVICE,
dev, (curl_socklen_t)strlen(dev)+1) != 0) {
error = SOCKERRNO;
infof(data, "SO_BINDTODEVICE %s failed with errno %d: %s;"
" will do regular bind\n",
dev, error, Curl_strerror(conn, error));
/* This is typically "errno 1, error: Operation not permitted" if
you're not running as root or another suitable privileged
user */
}
#endif
break;
}
}
if(!is_interface) {
/*
* This was not an interface, resolve the name as a host name
* or IP number
*
* Temporarily force name resolution to use only the address type
* of the connection. The resolve functions should really be changed
* to take a type parameter instead.
*/
long ipver = conn->ip_version;
int rc;
if(af == AF_INET)
conn->ip_version = CURL_IPRESOLVE_V4;
#ifdef ENABLE_IPV6
else if(af == AF_INET6)
conn->ip_version = CURL_IPRESOLVE_V6;
#endif
rc = Curl_resolv(conn, dev, 0, &h);
if(rc == CURLRESOLV_PENDING)
(void)Curl_resolver_wait_resolv(conn, &h);
conn->ip_version = ipver;
if(h) {
/* convert the resolved address, sizeof myhost >= INET_ADDRSTRLEN */
Curl_printable_address(h->addr, myhost, sizeof(myhost));
infof(data, "Name '%s' family %i resolved to '%s' family %i\n",
dev, af, myhost, h->addr->ai_family);
Curl_resolv_unlock(data, h);
done = 1;
}
else {
/*
* provided dev was no interface (or interfaces are not supported
* e.g. solaris) no ip address and no domain we fail here
*/
done = -1;
}
}
if(done > 0) {
#ifdef ENABLE_IPV6
/* ipv6 address */
if(af == AF_INET6) {
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
char *scope_ptr = strchr(myhost, '%');
if(scope_ptr)
*(scope_ptr++) = 0;
#endif
if(Curl_inet_pton(AF_INET6, myhost, &si6->sin6_addr) > 0) {
si6->sin6_family = AF_INET6;
si6->sin6_port = htons(port);
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
if(scope_ptr)
/* The "myhost" string either comes from Curl_if2ip or from
Curl_printable_address. The latter returns only numeric scope
IDs and the former returns none at all. So the scope ID, if
present, is known to be numeric */
si6->sin6_scope_id = atoi(scope_ptr);
#endif
}
sizeof_sa = sizeof(struct sockaddr_in6);
}
else
#endif
/* ipv4 address */
if((af == AF_INET) &&
(Curl_inet_pton(AF_INET, myhost, &si4->sin_addr) > 0)) {
si4->sin_family = AF_INET;
si4->sin_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in);
}
}
if(done < 1) {
failf(data, "Couldn't bind to '%s'", dev);
return CURLE_INTERFACE_FAILED;
}
}
else {
/* no device was given, prepare sa to match af's needs */
#ifdef ENABLE_IPV6
if(af == AF_INET6) {
si6->sin6_family = AF_INET6;
si6->sin6_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in6);
}
else
#endif
if(af == AF_INET) {
si4->sin_family = AF_INET;
si4->sin_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in);
}
}
for(;;) {
if(bind(sockfd, sock, sizeof_sa) >= 0) {
/* we succeeded to bind */
struct Curl_sockaddr_storage add;
curl_socklen_t size = sizeof(add);
memset(&add, 0, sizeof(struct Curl_sockaddr_storage));
if(getsockname(sockfd, (struct sockaddr *) &add, &size) < 0) {
data->state.os_errno = error = SOCKERRNO;
failf(data, "getsockname() failed with errno %d: %s",
error, Curl_strerror(conn, error));
return CURLE_INTERFACE_FAILED;
}
infof(data, "Local port: %hu\n", port);
conn->bits.bound = TRUE;
return CURLE_OK;
}
if(--portnum > 0) {
infof(data, "Bind to local port %hu failed, trying next\n", port);
port++; /* try next port */
/* We re-use/clobber the port variable here below */
if(sock->sa_family == AF_INET)
si4->sin_port = ntohs(port);
#ifdef ENABLE_IPV6
else
si6->sin6_port = ntohs(port);
#endif
}
else
break;
}
data->state.os_errno = error = SOCKERRNO;
failf(data, "bind failed with errno %d: %s",
error, Curl_strerror(conn, error));
return CURLE_INTERFACE_FAILED;
}
/*
* verifyconnect() returns TRUE if the connect really has happened.
*/
static bool verifyconnect(curl_socket_t sockfd, int *error)
{
bool rc = TRUE;
#ifdef SO_ERROR
int err = 0;
curl_socklen_t errSize = sizeof(err);
#ifdef WIN32
/*
* In October 2003 we effectively nullified this function on Windows due to
* problems with it using all CPU in multi-threaded cases.
*
* In May 2004, we bring it back to offer more info back on connect failures.
* Gisle Vanem could reproduce the former problems with this function, but
* could avoid them by adding this SleepEx() call below:
*
* "I don't have Rational Quantify, but the hint from his post was
* ntdll::NtRemoveIoCompletion(). So I'd assume the SleepEx (or maybe
* just Sleep(0) would be enough?) would release whatever
* mutex/critical-section the ntdll call is waiting on.
*
* Someone got to verify this on Win-NT 4.0, 2000."
*/
#ifdef _WIN32_WCE
Sleep(0);
#else
SleepEx(0, FALSE);
#endif
#endif
if(0 != getsockopt(sockfd, SOL_SOCKET, SO_ERROR, (void *)&err, &errSize))
err = SOCKERRNO;
#ifdef _WIN32_WCE
/* Old WinCE versions don't support SO_ERROR */
if(WSAENOPROTOOPT == err) {
SET_SOCKERRNO(0);
err = 0;
}
#endif
#ifdef __minix
/* Minix 3.1.x doesn't support getsockopt on UDP sockets */
if(EBADIOCTL == err) {
SET_SOCKERRNO(0);
err = 0;
}
#endif
if((0 == err) || (EISCONN == err))
/* we are connected, awesome! */
rc = TRUE;
else
/* This wasn't a successful connect */
rc = FALSE;
if(error)
*error = err;
#else
(void)sockfd;
if(error)
*error = SOCKERRNO;
#endif
return rc;
}
/* Used within the multi interface. Try next IP address, return TRUE if no
more address exists or error */
static CURLcode trynextip(struct connectdata *conn,
int sockindex,
bool *connected)
{
curl_socket_t sockfd;
Curl_addrinfo *ai;
/* First clean up after the failed socket.
Don't close it yet to ensure that the next IP's socket gets a different
file descriptor, which can prevent bugs when the curl_multi_socket_action
interface is used with certain select() replacements such as kqueue. */
curl_socket_t fd_to_close = conn->sock[sockindex];
conn->sock[sockindex] = CURL_SOCKET_BAD;
*connected = FALSE;
if(sockindex != FIRSTSOCKET) {
Curl_closesocket(conn, fd_to_close);
return CURLE_COULDNT_CONNECT; /* no next */
}
/* try the next address */
ai = conn->ip_addr->ai_next;
while(ai) {
CURLcode res = singleipconnect(conn, ai, &sockfd, connected);
if(res)
return res;
if(sockfd != CURL_SOCKET_BAD) {
/* store the new socket descriptor */
conn->sock[sockindex] = sockfd;
conn->ip_addr = ai;
Curl_closesocket(conn, fd_to_close);
return CURLE_OK;
}
ai = ai->ai_next;
}
Curl_closesocket(conn, fd_to_close);
return CURLE_COULDNT_CONNECT;
}
/* Copies connection info into the session handle to make it available
when the session handle is no longer associated with a connection. */
void Curl_persistconninfo(struct connectdata *conn)
{
memcpy(conn->data->info.conn_primary_ip, conn->primary_ip, MAX_IPADR_LEN);
memcpy(conn->data->info.conn_local_ip, conn->local_ip, MAX_IPADR_LEN);
conn->data->info.conn_primary_port = conn->primary_port;
conn->data->info.conn_local_port = conn->local_port;
}
/* retrieves ip address and port from a sockaddr structure */
static bool getaddressinfo(struct sockaddr* sa, char* addr,
long* port)
{
unsigned short us_port;
struct sockaddr_in* si = NULL;
#ifdef ENABLE_IPV6
struct sockaddr_in6* si6 = NULL;
#endif
#if defined(HAVE_SYS_UN_H) && defined(AF_UNIX)
struct sockaddr_un* su = NULL;
#endif
switch (sa->sa_family) {
case AF_INET:
si = (struct sockaddr_in*) sa;
if(Curl_inet_ntop(sa->sa_family, &si->sin_addr,
addr, MAX_IPADR_LEN)) {
us_port = ntohs(si->sin_port);
*port = us_port;
return TRUE;
}
break;
#ifdef ENABLE_IPV6
case AF_INET6:
si6 = (struct sockaddr_in6*)sa;
if(Curl_inet_ntop(sa->sa_family, &si6->sin6_addr,
addr, MAX_IPADR_LEN)) {
us_port = ntohs(si6->sin6_port);
*port = us_port;
return TRUE;
}
break;
#endif
#if defined(HAVE_SYS_UN_H) && defined(AF_UNIX)
case AF_UNIX:
su = (struct sockaddr_un*)sa;
snprintf(addr, MAX_IPADR_LEN, "%s", su->sun_path);
*port = 0;
return TRUE;
#endif
default:
break;
}
addr[0] = '\0';
*port = 0;
return FALSE;
}
/* retrieves the start/end point information of a socket of an established
connection */
void Curl_updateconninfo(struct connectdata *conn, curl_socket_t sockfd)
{
int error;
curl_socklen_t len;
struct Curl_sockaddr_storage ssrem;
struct Curl_sockaddr_storage ssloc;
struct SessionHandle *data = conn->data;
if(!conn->bits.reuse) {
len = sizeof(struct Curl_sockaddr_storage);
if(getpeername(sockfd, (struct sockaddr*) &ssrem, &len)) {
error = SOCKERRNO;
failf(data, "getpeername() failed with errno %d: %s",
error, Curl_strerror(conn, error));
return;
}
len = sizeof(struct Curl_sockaddr_storage);
if(getsockname(sockfd, (struct sockaddr*) &ssloc, &len)) {
error = SOCKERRNO;
failf(data, "getsockname() failed with errno %d: %s",
error, Curl_strerror(conn, error));
return;
}
if(!getaddressinfo((struct sockaddr*)&ssrem,
conn->primary_ip, &conn->primary_port)) {
error = ERRNO;
failf(data, "ssrem inet_ntop() failed with errno %d: %s",
error, Curl_strerror(conn, error));
return;
}
if(!getaddressinfo((struct sockaddr*)&ssloc,
conn->local_ip, &conn->local_port)) {
error = ERRNO;
failf(data, "ssloc inet_ntop() failed with errno %d: %s",
error, Curl_strerror(conn, error));
return;
}
}
/* persist connection info in session handle */
Curl_persistconninfo(conn);
}
/*
* Curl_is_connected() checks if the socket has connected.
*/
CURLcode Curl_is_connected(struct connectdata *conn,
int sockindex,
bool *connected)
{
struct SessionHandle *data = conn->data;
CURLcode code = CURLE_OK;
curl_socket_t sockfd = conn->sock[sockindex];
long allow = DEFAULT_CONNECT_TIMEOUT;
int error = 0;
struct timeval now;
enum chkconn_t chk;
DEBUGASSERT(sockindex >= FIRSTSOCKET && sockindex <= SECONDARYSOCKET);
*connected = FALSE; /* a very negative world view is best */
if(conn->bits.tcpconnect[sockindex]) {
/* we are connected already! */
*connected = TRUE;
return CURLE_OK;
}
now = Curl_tvnow();
/* figure out how long time we have left to connect */
allow = Curl_timeleft(data, &now, TRUE);
if(allow < 0) {
/* time-out, bail out, go home */
failf(data, "Connection time-out");
return CURLE_OPERATION_TIMEDOUT;
}
/* check socket for connect */
chk = checkconnect(sockfd);
if(CHKCONN_IDLE == chk) {
if(curlx_tvdiff(now, conn->connecttime) >= conn->timeoutms_per_addr) {
infof(data, "After %ldms connect time, move on!\n",
conn->timeoutms_per_addr);
goto next;
}
/* not an error, but also no connection yet */
return code;
}
if(CHKCONN_CONNECTED == chk) {
if(verifyconnect(sockfd, &error)) {
/* we are connected with TCP, awesome! */
/* see if we need to do any proxy magic first once we connected */
code = Curl_connected_proxy(conn);
if(code)
return code;
conn->bits.tcpconnect[sockindex] = TRUE;
*connected = TRUE;
if(sockindex == FIRSTSOCKET)
Curl_pgrsTime(data, TIMER_CONNECT); /* connect done */
Curl_verboseconnect(conn);
Curl_updateconninfo(conn, sockfd);
return CURLE_OK;
}
/* nope, not connected for real */
}
else {
/* nope, not connected */
if(CHKCONN_FDSET_ERROR == chk) {
(void)verifyconnect(sockfd, &error);
infof(data, "%s\n",Curl_strerror(conn, error));
}
else
infof(data, "Connection failed\n");
}
/*
* The connection failed here, we should attempt to connect to the "next
* address" for the given host. But first remember the latest error.
*/
if(error) {
data->state.os_errno = error;
SET_SOCKERRNO(error);
}
next:
conn->timeoutms_per_addr = conn->ip_addr->ai_next == NULL ?
allow : allow / 2;
code = trynextip(conn, sockindex, connected);
if(code) {
error = SOCKERRNO;
data->state.os_errno = error;
failf(data, "Failed connect to %s:%ld; %s",
conn->host.name, conn->port, Curl_strerror(conn, error));
}
return code;
}
static void tcpnodelay(struct connectdata *conn,
curl_socket_t sockfd)
{
#ifdef TCP_NODELAY
struct SessionHandle *data= conn->data;
curl_socklen_t onoff = (curl_socklen_t) data->set.tcp_nodelay;
int level = IPPROTO_TCP;
#if 0
/* The use of getprotobyname() is disabled since it isn't thread-safe on
numerous systems. On these getprotobyname_r() should be used instead, but
that exists in at least one 4 arg version and one 5 arg version, and
since the proto number rarely changes anyway we now just use the hard
coded number. The "proper" fix would need a configure check for the
correct function much in the same style the gethostbyname_r versions are
detected. */
struct protoent *pe = getprotobyname("tcp");
if(pe)
level = pe->p_proto;
#endif
if(setsockopt(sockfd, level, TCP_NODELAY, (void *)&onoff,
sizeof(onoff)) < 0)
infof(data, "Could not set TCP_NODELAY: %s\n",
Curl_strerror(conn, SOCKERRNO));
else
infof(data,"TCP_NODELAY set\n");
#else
(void)conn;
(void)sockfd;
#endif
}
#ifdef SO_NOSIGPIPE
/* The preferred method on Mac OS X (10.2 and later) to prevent SIGPIPEs when
sending data to a dead peer (instead of relying on the 4th argument to send
being MSG_NOSIGNAL). Possibly also existing and in use on other BSD
systems? */
static void nosigpipe(struct connectdata *conn,
curl_socket_t sockfd)
{
struct SessionHandle *data= conn->data;
int onoff = 1;
if(setsockopt(sockfd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&onoff,
sizeof(onoff)) < 0)
infof(data, "Could not set SO_NOSIGPIPE: %s\n",
Curl_strerror(conn, SOCKERRNO));
}
#else
#define nosigpipe(x,y) Curl_nop_stmt
#endif
#ifdef USE_WINSOCK
/* When you run a program that uses the Windows Sockets API, you may
experience slow performance when you copy data to a TCP server.
http://support.microsoft.com/kb/823764
Work-around: Make the Socket Send Buffer Size Larger Than the Program Send
Buffer Size
The problem described in this knowledge-base is applied only to pre-Vista
Windows. Following function trying to detect OS version and skips
SO_SNDBUF adjustment for Windows Vista and above.
*/
#define DETECT_OS_NONE 0
#define DETECT_OS_PREVISTA 1
#define DETECT_OS_VISTA_OR_LATER 2
void Curl_sndbufset(curl_socket_t sockfd)
{
int val = CURL_MAX_WRITE_SIZE + 32;
int curval = 0;
int curlen = sizeof(curval);
OSVERSIONINFO osver;
static int detectOsState = DETECT_OS_NONE;
if(detectOsState == DETECT_OS_NONE) {
memset(&osver, 0, sizeof(osver));
osver.dwOSVersionInfoSize = sizeof(osver);
detectOsState = DETECT_OS_PREVISTA;
if(GetVersionEx(&osver)) {
if(osver.dwMajorVersion >= 6)
detectOsState = DETECT_OS_VISTA_OR_LATER;
}
}
if(detectOsState == DETECT_OS_VISTA_OR_LATER)
return;
if(getsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, (char *)&curval, &curlen) == 0)
if(curval > val)
return;
setsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, (const char *)&val, sizeof(val));
}
#endif
/*
* singleipconnect()
*
* Note that even on connect fail it returns CURLE_OK, but with 'sock' set to
* CURL_SOCKET_BAD. Other errors will however return proper errors.
*
* singleipconnect() connects to the given IP only, and it may return without
* having connected.
*/
static CURLcode
singleipconnect(struct connectdata *conn,
const Curl_addrinfo *ai,
curl_socket_t *sockp,
bool *connected)
{
struct Curl_sockaddr_ex addr;
int rc;
int error = 0;
bool isconnected = FALSE;
struct SessionHandle *data = conn->data;
curl_socket_t sockfd;
CURLcode res = CURLE_OK;
*sockp = CURL_SOCKET_BAD;
*connected = FALSE; /* default is not connected */
res = Curl_socket(conn, ai, &addr, &sockfd);
if(res)
/* Failed to create the socket, but still return OK since we signal the
lack of socket as well. This allows the parent function to keep looping
over alternative addresses/socket families etc. */
return CURLE_OK;
/* store remote address and port used in this connection attempt */
if(!getaddressinfo((struct sockaddr*)&addr.sa_addr,
conn->primary_ip, &conn->primary_port)) {
/* malformed address or bug in inet_ntop, try next address */
error = ERRNO;
failf(data, "sa_addr inet_ntop() failed with errno %d: %s",
error, Curl_strerror(conn, error));
Curl_closesocket(conn, sockfd);
return CURLE_OK;
}
memcpy(conn->ip_addr_str, conn->primary_ip, MAX_IPADR_LEN);
infof(data, " Trying %s...\n", conn->ip_addr_str);
Curl_persistconninfo(conn);
if(data->set.tcp_nodelay)
tcpnodelay(conn, sockfd);
nosigpipe(conn, sockfd);
Curl_sndbufset(sockfd);
if(data->set.tcp_keepalive)
tcpkeepalive(data, sockfd);
if(data->set.fsockopt) {
/* activate callback for setting socket options */
error = data->set.fsockopt(data->set.sockopt_client,
sockfd,
CURLSOCKTYPE_IPCXN);
if(error == CURL_SOCKOPT_ALREADY_CONNECTED)
isconnected = TRUE;
else if(error) {
Curl_closesocket(conn, sockfd); /* close the socket and bail out */
return CURLE_ABORTED_BY_CALLBACK;
}
}