diff options
Diffstat (limited to 'libcurl/src/lib/connect.c')
| -rw-r--r-- | libcurl/src/lib/connect.c | 1377 |
1 files changed, 1377 insertions, 0 deletions
diff --git a/libcurl/src/lib/connect.c b/libcurl/src/lib/connect.c new file mode 100644 index 0000000..eaaac4e --- /dev/null +++ b/libcurl/src/lib/connect.c @@ -0,0 +1,1377 @@ +/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, 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
+
+#include "curl_printf.h"
+#include "urldata.h"
+#include "sendf.h"
+#include "if2ip.h"
+#include "strerror.h"
+#include "connect.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 "vtls/vtls.h" /* for Curl_ssl_check_cxn() */
+#include "progress.h"
+#include "warnless.h"
+#include "conncache.h"
+#include "multihandle.h"
+
+/* The last #include files should be: */
+#include "curl_memory.h"
+#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_WINSOCK2_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);
+
+/*
+ * 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
+ */
+CURL_STATIC 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 */
+ if(duringconnect)
+ /* since this most recent connect started */
+ timeout_ms -= Curl_tvdiff(*nowp, data->progress.t_startsingle);
+ else
+ /* since the entire operation started */
+ timeout_ms -= Curl_tvdiff(*nowp, data->progress.t_startop);
+ if(!timeout_ms)
+ /* avoid returning 0 as that means no timeout! */
+ return -1;
+
+ return timeout_ms;
+}
+
+static CURLcode bindlocal(struct connectdata *conn,
+ curl_socket_t sockfd, int af, unsigned int scope)
+{
+ 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;
+
+ /*************************************************************
+ * 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) ) {
+ 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!";
+
+ 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, scope, conn->scope_id, 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);
+#elif !defined(CURL_WINRT)
+ 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,
+ int tempindex)
+{
+ const int other = tempindex ^ 1;
+ CURLcode result = CURLE_COULDNT_CONNECT;
+
+ /* 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->tempsock[tempindex];
+ conn->tempsock[tempindex] = CURL_SOCKET_BAD;
+
+ if(sockindex == FIRSTSOCKET) {
+ Curl_addrinfo *ai = NULL;
+ int family = AF_UNSPEC;
+
+ if(conn->tempaddr[tempindex]) {
+ /* find next address in the same protocol family */
+ family = conn->tempaddr[tempindex]->ai_family;
+ ai = conn->tempaddr[tempindex]->ai_next;
+ }
+#ifdef ENABLE_IPV6
+ else if(conn->tempaddr[0]) {
+ /* happy eyeballs - try the other protocol family */
+ int firstfamily = conn->tempaddr[0]->ai_family;
+ family = (firstfamily == AF_INET) ? AF_INET6 : AF_INET;
+ ai = conn->tempaddr[0]->ai_next;
+ }
+#endif
+
+ while(ai) {
+ if(conn->tempaddr[other]) {
+ /* we can safely skip addresses of the other protocol family */
+ while(ai && ai->ai_family != family)
+ ai = ai->ai_next;
+ }
+
+ if(ai) {
+ result = singleipconnect(conn, ai, &conn->tempsock[tempindex]);
+ if(result == CURLE_COULDNT_CONNECT) {
+ ai = ai->ai_next;
+ continue;
+ }
+
+ conn->tempaddr[tempindex] = ai;
+ }
+ break;
+ }
+ }
+
+ if(fd_to_close != CURL_SOCKET_BAD)
+ Curl_closesocket(conn, fd_to_close);
+
+ return result;
+}
+
+/* Copies connection info into the session handle to make it available
+ when the session handle is no longer associated with a connection. */
+CURL_STATIC 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 */
+CURL_STATIC void Curl_updateconninfo(struct connectdata *conn, curl_socket_t sockfd)
+{
+ curl_socklen_t len;
+ struct Curl_sockaddr_storage ssrem;
+ struct Curl_sockaddr_storage ssloc;
+ struct SessionHandle *data = conn->data;
+
+ if(conn->socktype == SOCK_DGRAM)
+ /* there's no connection! */
+ return;
+
+ if(!conn->bits.reuse) {
+ int error;
+
+ 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);
+ memset(&ssloc, 0, sizeof(ssloc));
+ 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;
+ }
+ memcpy(conn->ip_addr_str, conn->primary_ip, MAX_IPADR_LEN);
+
+ 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.
+ */
+
+CURL_STATIC CURLcode Curl_is_connected(struct connectdata *conn,
+ int sockindex,
+ bool *connected)
+{
+ struct SessionHandle *data = conn->data;
+ CURLcode result = CURLE_OK;
+ long allow;
+ int error = 0;
+ struct timeval now;
+ int rc;
+ int i;
+
+ 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;
+ }
+
+ for(i=0; i<2; i++) {
+ const int other = i ^ 1;
+ if(conn->tempsock[i] == CURL_SOCKET_BAD)
+ continue;
+
+#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(conn->tempsock[i], NULL);
+#endif
+
+ /* check socket for connect */
+ rc = Curl_socket_ready(CURL_SOCKET_BAD, conn->tempsock[i], 0);
+
+ if(rc == 0) { /* no connection yet */
+ if(curlx_tvdiff(now, conn->connecttime) >= conn->timeoutms_per_addr) {
+ infof(data, "After %ldms connect time, move on!\n",
+ conn->timeoutms_per_addr);
+ error = ETIMEDOUT;
+ }
+
+ /* should we try another protocol family? */
+ if(i == 0 && conn->tempaddr[1] == NULL &&
+ curlx_tvdiff(now, conn->connecttime) >= HAPPY_EYEBALLS_TIMEOUT) {
+ trynextip(conn, sockindex, 1);
+ }
+ }
+ else if(rc == CURL_CSELECT_OUT) {
+ if(verifyconnect(conn->tempsock[i], &error)) {
+ /* we are connected with TCP, awesome! */
+
+ /* use this socket from now on */
+ conn->sock[sockindex] = conn->tempsock[i];
+ conn->ip_addr = conn->tempaddr[i];
+ conn->tempsock[i] = CURL_SOCKET_BAD;
+
+ /* close the other socket, if open */
+ if(conn->tempsock[other] != CURL_SOCKET_BAD) {
+ Curl_closesocket(conn, conn->tempsock[other]);
+ conn->tempsock[other] = CURL_SOCKET_BAD;
+ }
+
+ /* see if we need to do any proxy magic first once we connected */
+ result = Curl_connected_proxy(conn, sockindex);
+ if(result)
+ return result;
+
+ conn->bits.tcpconnect[sockindex] = TRUE;
+
+ *connected = TRUE;
+ if(sockindex == FIRSTSOCKET)
+ Curl_pgrsTime(data, TIMER_CONNECT); /* connect done */
+ Curl_updateconninfo(conn, conn->sock[sockindex]);
+ Curl_verboseconnect(conn);
+
+ return CURLE_OK;
+ }
+ else
+ infof(data, "Connection failed\n");
+ }
+ else if(rc & CURL_CSELECT_ERR)
+ (void)verifyconnect(conn->tempsock[i], &error);
+
+ /*
+ * 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);
+ if(conn->tempaddr[i]) {
+ CURLcode status;
+ char ipaddress[MAX_IPADR_LEN];
+ Curl_printable_address(conn->tempaddr[i], ipaddress, MAX_IPADR_LEN);
+ infof(data, "connect to %s port %ld failed: %s\n",
+ ipaddress, conn->port, Curl_strerror(conn, error));
+
+ conn->timeoutms_per_addr = conn->tempaddr[i]->ai_next == NULL ?
+ allow : allow / 2;
+
+ status = trynextip(conn, sockindex, i);
+ if(status != CURLE_COULDNT_CONNECT
+ || conn->tempsock[other] == CURL_SOCKET_BAD)
+ /* the last attempt failed and no other sockets remain open */
+ result = status;
+ }
+ }
+ }
+
+ if(result) {
+ /* no more addresses to try */
+
+ /* if the first address family runs out of addresses to try before
+ the happy eyeball timeout, go ahead and try the next family now */
+ if(conn->tempaddr[1] == NULL) {
+ result = trynextip(conn, sockindex, 1);
+ if(!result)
+ return result;
+ }
+
+ failf(data, "Failed to connect to %s port %ld: %s",
+ conn->bits.proxy?conn->proxy.name:conn->host.name,
+ conn->port, Curl_strerror(conn, error));
+ }
+
+ return result;
+}
+
+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
+
+CURL_STATIC void Curl_sndbufset(curl_socket_t sockfd)
+{
+ int val = CURL_MAX_WRITE_SIZE + 32;
+ int curval = 0;
+ int curlen = sizeof(curval);
+ DWORD majorVersion = 6;
+
+ static int detectOsState = DETECT_OS_NONE;
+
+ if(detectOsState == DETECT_OS_NONE) {
+#if !defined(_WIN32_WINNT) || !defined(_WIN32_WINNT_WIN2K) || \
+ (_WIN32_WINNT < _WIN32_WINNT_WIN2K)
+ OSVERSIONINFO osver;
+
+ memset(&osver, 0, sizeof(osver));
+ osver.dwOSVersionInfoSize = sizeof(osver);
+
+ detectOsState = DETECT_OS_PREVISTA;
+ if(GetVersionEx(&osver)) {
+ if(osver.dwMajorVersion >= majorVersion)
+ detectOsState = DETECT_OS_VISTA_OR_LATER;
+ }
+#elif defined(CURL_WINRT)
+ detectOsState = DETECT_OS_VISTA_OR_LATER;
+#else
+ ULONGLONG majorVersionMask;
+ OSVERSIONINFOEX osver;
+
+ memset(&osver, 0, sizeof(osver));
+ osver.dwOSVersionInfoSize = sizeof(osver);
+ osver.dwMajorVersion = majorVersion;
+ majorVersionMask = VerSetConditionMask(0, VER_MAJORVERSION,
+ VER_GREATER_EQUAL);
+
+ if(VerifyVersionInfo(&osver, VER_MAJORVERSION, majorVersionMask))
+ detectOsState = DETECT_OS_VISTA_OR_LATER;
+ else
+ detectOsState = DETECT_OS_PREVISTA;
+#endif
+ }
+
+ 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)
+{
+ struct Curl_sockaddr_ex addr;
+ int rc;
+ int error = 0;
+ bool isconnected = FALSE;
+ struct SessionHandle *data = conn->data;
+ curl_socket_t sockfd;
+ CURLcode result;
+ char ipaddress[MAX_IPADR_LEN];
+ long port;
+ bool is_tcp;
+
+ *sockp = CURL_SOCKET_BAD;
+
+ result = Curl_socket(conn, ai, &addr, &sockfd);
+ if(result)
+ /* 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,
+ ipaddress, &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;
+ }
+ infof(data, " Trying %s...\n", ipaddress);
+
+#ifdef ENABLE_IPV6
+ is_tcp = (addr.family == AF_INET || addr.family == AF_INET6) &&
+ addr.socktype == SOCK_STREAM;
+#else
+ is_tcp = (addr.family == AF_INET) && addr.socktype == SOCK_STREAM;
+#endif
+ if(is_tcp && data->set.tcp_nodelay)
+ tcpnodelay(conn, sockfd);
+
+ nosigpipe(conn, sockfd);
+
+ Curl_sndbufset(sockfd);
+
+ if(is_tcp && 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;
+ }
+ }
+
+ /* possibly bind the local end to an IP, interface or port */
+ if(addr.family == AF_INET
+#ifdef ENABLE_IPV6
+ || addr.family == AF_INET6
+#endif
+ ) {
+ result = bindlocal(conn, sockfd, addr.family,
+ Curl_ipv6_scope((struct sockaddr*)&addr.sa_addr));
+ if(result) {
+ Curl_closesocket(conn, sockfd); /* close socket and bail out */
+ if(result == CURLE_UNSUPPORTED_PROTOCOL) {
+ /* The address family is not supported on this interface.
+ We can continue trying addresses */
+ return CURLE_COULDNT_CONNECT;
+ }
+ return result;
+ }
+ }
+
+ /* set socket non-blocking */
+ (void)curlx_nonblock(sockfd, TRUE);
+
+ conn->connecttime = Curl_tvnow();
+ if(conn->num_addr > 1)
+ Curl_expire_latest(data, conn->timeoutms_per_addr);
+
+ /* Connect TCP sockets, bind UDP */
+ if(!isconnected && (conn->socktype == SOCK_STREAM)) {
+ rc = connect(sockfd, &addr.sa_addr, addr.addrlen);
+ if(-1 == rc)
+ error = SOCKERRNO;
+ }
+ else {
+ *sockp = sockfd;
+ return CURLE_OK;
+ }
+
+#ifdef ENABLE_IPV6
+ conn->bits.ipv6 = (addr.family == AF_INET6)?TRUE:FALSE;
+#endif
+
+ if(-1 == rc) {
+ switch(error) {
+ case EINPROGRESS:
+ case EWOULDBLOCK:
+#if defined(EAGAIN)
+#if (EAGAIN) != (EWOULDBLOCK)
+ /* On some platforms EAGAIN and EWOULDBLOCK are the
+ * same value, and on others they are different, hence
+ * the odd #if
+ */
+ case EAGAIN:
+#endif
+#endif
+ result = CURLE_OK;
+ break;
+
+ default:
+ /* unknown error, fallthrough and try another address! */
+ infof(data, "Immediate connect fail for %s: %s\n",
+ ipaddress, Curl_strerror(conn, error));
+ data->state.os_errno = error;
+
+ /* connect failed */
+ Curl_closesocket(conn, sockfd);
+ result = CURLE_COULDNT_CONNECT;
+ }
+ }
+
+ if(!result)
+ *sockp = sockfd;
+
+ return result;
+}
+
+/*
+ * TCP connect to the given host with timeout, proxy or remote doesn't matter.
+ * There might be more than one IP address to try out. Fill in the passed
+ * pointer with the connected socket.
+ */
+
+CURL_STATIC CURLcode Curl_connecthost(struct connectdata *conn, /* context */
+ const struct Curl_dns_entry *remotehost)
+{
+ struct SessionHandle *data = conn->data;
+ struct timeval before = Curl_tvnow();
+ CURLcode result = CURLE_COULDNT_CONNECT;
+
+ long timeout_ms = Curl_timeleft(data, &before, TRUE);
+
+ if(timeout_ms < 0) {
+ /* a precaution, no need to continue if time already is up */
+ failf(data, "Connection time-out");
+ return CURLE_OPERATION_TIMEDOUT;
+ }
+
+ conn->num_addr = Curl_num_addresses(remotehost->addr);
+ conn->tempaddr[0] = remotehost->addr;
+ conn->tempaddr[1] = NULL;
+ conn->tempsock[0] = CURL_SOCKET_BAD;
+ conn->tempsock[1] = CURL_SOCKET_BAD;
+ Curl_expire(conn->data, HAPPY_EYEBALLS_TIMEOUT);
+
+ /* Max time for the next connection attempt */
+ conn->timeoutms_per_addr =
+ conn->tempaddr[0]->ai_next == NULL ? timeout_ms : timeout_ms / 2;
+
+ /* start connecting to first IP */
+ while(conn->tempaddr[0]) {
+ result = singleipconnect(conn, conn->tempaddr[0], &(conn->tempsock[0]));
+ if(!result)
+ break;
+ conn->tempaddr[0] = conn->tempaddr[0]->ai_next;
+ }
+
+ if(conn->tempsock[0] == CURL_SOCKET_BAD)
+ return result;
+
+ data->info.numconnects++; /* to track the number of connections made */
+
+ return CURLE_OK;
+}
+
+struct connfind {
+ struct connectdata *tofind;
+ bool found;
+};
+
+static int conn_is_conn(struct connectdata *conn, void *param)
+{
+ struct connfind *f = (struct connfind *)param;
+ if(conn == f->tofind) {
+ f->found = TRUE;
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * Used to extract socket and connectdata struct for the most recent
+ * transfer on the given SessionHandle.
+ *
+ * The returned socket will be CURL_SOCKET_BAD in case of failure!
+ */
+CURL_STATIC curl_socket_t Curl_getconnectinfo(struct SessionHandle *data,
+ struct connectdata **connp)
+{
+ curl_socket_t sockfd;
+
+ DEBUGASSERT(data);
+
+ /* this works for an easy handle:
+ * - that has been used for curl_easy_perform()
+ * - that is associated with a multi handle, and whose connection
+ * was detached with CURLOPT_CONNECT_ONLY
+ */
+ if(data->state.lastconnect && (data->multi_easy || data->multi)) {
+ struct connectdata *c = data->state.lastconnect;
+ struct connfind find;
+ find.tofind = data->state.lastconnect;
+ find.found = FALSE;
+
+ Curl_conncache_foreach(data->multi_easy?
+ data->multi_easy->conn_cache:
+ data->multi->conn_cache, &find, conn_is_conn);
+
+ if(!find.found) {
+ data->state.lastconnect = NULL;
+ return CURL_SOCKET_BAD;
+ }
+
+ if(connp)
+ /* only store this if the caller cares for it */
+ *connp = c;
+ sockfd = c->sock[FIRSTSOCKET];
+ /* we have a socket connected, let's determine if the server shut down */
+ /* determine if ssl */
+ if(c->ssl[FIRSTSOCKET].use) {
+ /* use the SSL context */
+ if(!Curl_ssl_check_cxn(c))
+ return CURL_SOCKET_BAD; /* FIN received */
+ }
+/* Minix 3.1 doesn't support any flags on recv; just assume socket is OK */
+#ifdef MSG_PEEK
+ else {
+ /* use the socket */
+ char buf;
+ if(recv((RECV_TYPE_ARG1)c->sock[FIRSTSOCKET], (RECV_TYPE_ARG2)&buf,
+ (RECV_TYPE_ARG3)1, (RECV_TYPE_ARG4)MSG_PEEK) == 0) {
+ return CURL_SOCKET_BAD; /* FIN received */
+ }
+ }
+#endif
+ }
+ else
+ return CURL_SOCKET_BAD;
+
+ return sockfd;
+}
+
+/*
+ * Close a socket.
+ *
+ * 'conn' can be NULL, beware!
+ */
+CURL_STATIC int Curl_closesocket(struct connectdata *conn,
+ curl_socket_t sock)
+{
+ if(conn && conn->fclosesocket) {
+ if((sock == conn->sock[SECONDARYSOCKET]) &&
+ conn->sock_accepted[SECONDARYSOCKET])
+ /* if this socket matches the second socket, and that was created with
+ accept, then we MUST NOT call the callback but clear the accepted
+ status */
+ conn->sock_accepted[SECONDARYSOCKET] = FALSE;
+ else {
+ Curl_multi_closed(conn, sock);
+ return conn->fclosesocket(conn->closesocket_client, sock);
+ }
+ }
+
+ if(conn)
+ /* tell the multi-socket code about this */
+ Curl_multi_closed(conn, sock);
+
+ sclose(sock);
+
+ return 0;
+}
+
+/*
+ * Create a socket based on info from 'conn' and 'ai'.
+ *
+ * 'addr' should be a pointer to the correct struct to get data back, or NULL.
+ * 'sockfd' must be a pointer to a socket descriptor.
+ *
+ * If the open socket callback is set, used that!
+ *
+ */
+CURL_STATIC CURLcode Curl_socket(struct connectdata *conn,
+ const Curl_addrinfo *ai,
+ struct Curl_sockaddr_ex *addr,
+ curl_socket_t *sockfd)
+{
+ struct SessionHandle *data = conn->data;
+ struct Curl_sockaddr_ex dummy;
+
+ if(!addr)
+ /* if the caller doesn't want info back, use a local temp copy */
+ addr = &dummy;
+
+ /*
+ * The Curl_sockaddr_ex structure is basically libcurl's external API
+ * curl_sockaddr structure with enough space available to directly hold
+ * any protocol-specific address structures. The variable declared here
+ * will be used to pass / receive data to/from the fopensocket callback
+ * if this has been set, before that, it is initialized from parameters.
+ */
+
+ addr->family = ai->ai_family;
+ addr->socktype = conn->socktype;
+ addr->protocol = conn->socktype==SOCK_DGRAM?IPPROTO_UDP:ai->ai_protocol;
+ addr->addrlen = ai->ai_addrlen;
+
+ if(addr->addrlen > sizeof(struct Curl_sockaddr_storage))
+ addr->addrlen = sizeof(struct Curl_sockaddr_storage);
+ memcpy(&addr->sa_addr, ai->ai_addr, addr->addrlen);
+
+ if(data->set.fopensocket)
+ /*
+ * If the opensocket callback is set, all the destination address
+ * information is passed to the callback. Depending on this information the
+ * callback may opt to abort the connection, this is indicated returning
+ * CURL_SOCKET_BAD; otherwise it will return a not-connected socket. When
+ * the callback returns a valid socket the destination address information
+ * might have been changed and this 'new' address will actually be used
+ * here to connect.
+ */
+ *sockfd = data->set.fopensocket(data->set.opensocket_client,
+ CURLSOCKTYPE_IPCXN,
+ (struct curl_sockaddr *)addr);
+ else
+ /* opensocket callback not set, so simply create the socket now */
+ *sockfd = socket(addr->family, addr->socktype, addr->protocol);
+
+ if(*sockfd == CURL_SOCKET_BAD)
+ /* no socket, no connection */
+ return CURLE_COULDNT_CONNECT;
+
+#if defined(ENABLE_IPV6) && defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID)
+ if(conn->scope_id && (addr->family == AF_INET6)) {
+ struct sockaddr_in6 * const sa6 = (void *)&addr->sa_addr;
+ sa6->sin6_scope_id = conn->scope_id;
+ }
+#endif
+
+ return CURLE_OK;
+
+}
+
+#ifdef CURLDEBUG
+/*
+ * Curl_conncontrol() is used to set the conn->bits.close bit on or off. It
+ * MUST be called with the connclose() or connkeep() macros with a stated
+ * reason. The reason is only shown in debug builds but helps to figure out
+ * decision paths when connections are or aren't re-used as expected.
+ */
+CURL_STATIC void Curl_conncontrol(struct connectdata *conn, bool closeit,
+ const char *reason)
+{
+#if defined(CURL_DISABLE_VERBOSE_STRINGS)
+ (void) reason;
+#endif
+ if(closeit != conn->bits.close) {
+ infof(conn->data, "Marked for [%s]: %s\n", closeit?"closure":"keep alive",
+ reason);
+
+ conn->bits.close = closeit; /* the only place in the source code that
+ should assign this bit */
+ }
+}
+#endif
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