diff options
Diffstat (limited to 'lib/connect.c')
| -rw-r--r-- | lib/connect.c | 1138 |
1 files changed, 1138 insertions, 0 deletions
diff --git a/lib/connect.c b/lib/connect.c new file mode 100644 index 000000000..7638854b3 --- /dev/null +++ b/lib/connect.c @@ -0,0 +1,1138 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2010, 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 "setup.h" + +#ifdef HAVE_SYS_TIME_H +#include <sys/time.h> +#endif +#ifdef HAVE_SYS_SOCKET_H +#include <sys/socket.h> +#endif +#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_UNISTD_H +#include <unistd.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 +#ifdef HAVE_STDLIB_H +#include <stdlib.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 <stdio.h> +#include <errno.h> +#include <string.h> + +#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" + +/* The last #include file should be: */ +#include "memdebug.h" + +#ifdef __SYMBIAN32__ +/* This isn't actually supported under Symbian OS */ +#undef SO_NOSIGPIPE +#endif + +struct Curl_sockaddr_ex { + int family; + int socktype; + int protocol; + unsigned int addrlen; + union { + struct sockaddr addr; + struct Curl_sockaddr_storage buff; + } _sa_ex_u; +}; +#define sa_addr _sa_ex_u.addr + +static bool verifyconnect(curl_socket_t sockfd, int *error); + +static CURLcode +singleipconnect(struct connectdata *conn, + const Curl_addrinfo *ai, /* start connecting to this */ + long timeout_ms, + 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. + * + * 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! + */ +long Curl_timeleft(struct connectdata *conn, + struct timeval *nowp, + bool duringconnect) +{ + struct SessionHandle *data = conn->data; + 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; + } + + /* substract 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; +} + +/* + * waitconnect() waits for a TCP connect on the given socket for the specified + * number if milliseconds. It returns: + */ + +#define WAITCONN_CONNECTED 0 +#define WAITCONN_SELECT_ERROR -1 +#define WAITCONN_TIMEOUT 1 +#define WAITCONN_FDSET_ERROR 2 +#define WAITCONN_ABORTED 3 + +static +int waitconnect(struct connectdata *conn, + curl_socket_t sockfd, /* socket */ + long timeout_msec) +{ + 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 + + for(;;) { + + /* now select() until we get connect or timeout */ + rc = Curl_socket_ready(CURL_SOCKET_BAD, sockfd, (int)(timeout_msec>1000? + 1000:timeout_msec)); + if(Curl_pgrsUpdate(conn)) + return WAITCONN_ABORTED; + + if(-1 == rc) + /* error, no connect here, try next */ + return WAITCONN_SELECT_ERROR; + + else if(0 == rc) { + /* timeout */ + timeout_msec -= 1000; + if(timeout_msec <= 0) + return WAITCONN_TIMEOUT; + + continue; + } + + if(rc & CURL_CSELECT_ERR) + /* error condition caught */ + return WAITCONN_FDSET_ERROR; + + break; + } + return WAITCONN_CONNECTED; +} + +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 */ + + /************************************************************* + * 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) ) { + + /* interface */ + if(Curl_if2ip(af, dev, myhost, sizeof(myhost))) { + /* + * 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 + } + else { + /* + * 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_wait_for_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) && + (Curl_inet_pton(AF_INET6, myhost, &si6->sin6_addr) > 0)) { + si6->sin6_family = AF_INET6; + si6->sin6_port = htons(port); + 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) { + sclose(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, 0L, &sockfd, connected); + if(res) + return res; + if(sockfd != CURL_SOCKET_BAD) { + /* store the new socket descriptor */ + conn->sock[sockindex] = sockfd; + conn->ip_addr = ai; + sclose(fd_to_close); + return CURLE_OK; + } + ai = ai->ai_next; + } + sclose(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() is used from the multi interface to check if the + * firstsocket has connected. + */ + +CURLcode Curl_is_connected(struct connectdata *conn, + int sockindex, + bool *connected) +{ + int rc; + struct SessionHandle *data = conn->data; + CURLcode code = CURLE_OK; + curl_socket_t sockfd = conn->sock[sockindex]; + long allow = DEFAULT_CONNECT_TIMEOUT; + int error = 0; + + DEBUGASSERT(sockindex >= FIRSTSOCKET && sockindex <= SECONDARYSOCKET); + + *connected = FALSE; /* a very negative world view is best */ + + if(conn->bits.tcpconnect) { + /* we are connected already! */ + *connected = TRUE; + return CURLE_OK; + } + + /* figure out how long time we have left to connect */ + allow = Curl_timeleft(conn, NULL, TRUE); + + if(allow < 0) { + /* time-out, bail out, go home */ + failf(data, "Connection time-out"); + return CURLE_OPERATION_TIMEDOUT; + } + + /* check for connect without timeout as we want to return immediately */ + rc = waitconnect(conn, sockfd, 0); + if(WAITCONN_TIMEOUT == rc) + /* not an error, but also no connection yet */ + return code; + + if(WAITCONN_CONNECTED == rc) { + if(verifyconnect(sockfd, &error)) { + /* we are connected, awesome! */ + conn->bits.tcpconnect = TRUE; + *connected = TRUE; + 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(WAITCONN_FDSET_ERROR == rc) { + (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); + } + + 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 proto = 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) + proto = pe->p_proto; +#endif + + if(setsockopt(sockfd, proto, 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) +#endif + +#ifdef WIN32 +/* 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 + +*/ +void Curl_sndbufset(curl_socket_t sockfd) +{ + int val = CURL_MAX_WRITE_SIZE + 32; + int curval = 0; + int curlen = sizeof(curval); + + 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 if used from the multi interface. + */ +static CURLcode +singleipconnect(struct connectdata *conn, + const Curl_addrinfo *ai, + long timeout_ms, + curl_socket_t *sockp, + bool *connected) +{ + struct Curl_sockaddr_ex addr; + int rc; + int error; + bool isconnected; + struct SessionHandle *data = conn->data; + curl_socket_t sockfd; + CURLcode res = CURLE_OK; +#if defined(ENABLE_IPV6) && defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID) + struct sockaddr_in6 * const sa6 = (void *)&addr.sa_addr; +#endif + + *sockp = CURL_SOCKET_BAD; + + /* + * 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 = 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); + + *connected = FALSE; /* default is not connected */ + + 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_OK; + +#if defined(ENABLE_IPV6) && defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID) + if (conn->scope && (addr.family == AF_INET6)) + sa6->sin6_scope_id = conn->scope; +#endif + + /* 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)); + sclose(sockfd); + return CURLE_OK; + } + memcpy(conn->ip_addr_str, conn->primary_ip, MAX_IPADR_LEN); + infof(data, " Trying %s... ", conn->ip_addr_str); + + Curl_persistconninfo(conn); + +#ifdef ENABLE_IPV6 + if(addr.family == AF_INET6) + conn->bits.ipv6 = TRUE; +#endif + + if(data->set.tcp_nodelay) + tcpnodelay(conn, sockfd); + + nosigpipe(conn, sockfd); + + Curl_sndbufset(sockfd); + + if(data->set.fsockopt) { + /* activate callback for setting socket options */ + error = data->set.fsockopt(data->set.sockopt_client, + sockfd, + CURLSOCKTYPE_IPCXN); + if(error) { + sclose(sockfd); /* close the socket and bail out */ + return res; + } + } + + /* possibly bind the local end to an IP, interface or port */ + res = bindlocal(conn, sockfd, addr.family); + if(res) { + sclose(sockfd); /* close socket and bail out */ + return res; + } + + /* set socket non-blocking */ + curlx_nonblock(sockfd, TRUE); + + /* Connect TCP sockets, bind UDP */ + if(conn->socktype == SOCK_STREAM) + rc = connect(sockfd, &addr.sa_addr, addr.addrlen); + else + rc = 0; + + if(-1 == rc) { + error = SOCKERRNO; + + 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 + rc = waitconnect(conn, sockfd, timeout_ms); + if(WAITCONN_ABORTED == rc) { + sclose(sockfd); + return CURLE_ABORTED_BY_CALLBACK; + } + break; + default: + /* unknown error, fallthrough and try another address! */ + failf(data, "Failed to connect to %s: %s", + conn->ip_addr_str, Curl_strerror(conn,error)); + data->state.os_errno = error; + break; + } + } + + /* The 'WAITCONN_TIMEOUT == rc' comes from the waitconnect(), and not from + connect(). We can be sure of this since connect() cannot return 1. */ + if((WAITCONN_TIMEOUT == rc) && + (data->state.used_interface == Curl_if_multi)) { + /* Timeout when running the multi interface */ + *sockp = sockfd; + return CURLE_OK; + } + + isconnected = verifyconnect(sockfd, &error); + + if(!rc && isconnected) { + /* we are connected, awesome! */ + *connected = TRUE; /* this is a true connect */ + infof(data, "connected\n"); + Curl_updateconninfo(conn, sockfd); + *sockp = sockfd; + return CURLE_OK; + } + else if(WAITCONN_TIMEOUT == rc) + infof(data, "Timeout\n"); + else { + data->state.os_errno = error; + infof(data, "%s\n", Curl_strerror(conn, error)); + } + + /* connect failed or timed out */ + sclose(sockfd); + + return CURLE_OK; +} + +/* + * 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. + */ + +CURLcode Curl_connecthost(struct connectdata *conn, /* context */ + const struct Curl_dns_entry *remotehost, + curl_socket_t *sockconn, /* the connected socket */ + Curl_addrinfo **addr, /* the one we used */ + bool *connected) /* really connected? */ +{ + struct SessionHandle *data = conn->data; + curl_socket_t sockfd = CURL_SOCKET_BAD; + int aliasindex; + int num_addr; + Curl_addrinfo *ai; + Curl_addrinfo *curr_addr; + + struct timeval after; + struct timeval before = Curl_tvnow(); + + /************************************************************* + * Figure out what maximum time we have left + *************************************************************/ + long timeout_ms; + long timeout_per_addr; + + DEBUGASSERT(sockconn); + *connected = FALSE; /* default to not connected */ + + /* get the timeout left */ + timeout_ms = Curl_timeleft(conn, &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; + } + + /* Max time for each address */ + num_addr = Curl_num_addresses(remotehost->addr); + timeout_per_addr = timeout_ms / num_addr; + + ai = remotehost->addr; + + /* Below is the loop that attempts to connect to all IP-addresses we + * know for the given host. One by one until one IP succeeds. + */ + + if(data->state.used_interface == Curl_if_multi) + /* don't hang when doing multi */ + timeout_per_addr = 0; + + /* + * Connecting with a Curl_addrinfo chain + */ + for (curr_addr = ai, aliasindex=0; curr_addr; + curr_addr = curr_addr->ai_next, aliasindex++) { + + /* start connecting to the IP curr_addr points to */ + CURLcode res = + singleipconnect(conn, curr_addr, timeout_per_addr, &sockfd, connected); + + if(res) + return res; + + if(sockfd != CURL_SOCKET_BAD) + break; + + /* get a new timeout for next attempt */ + after = Curl_tvnow(); + timeout_ms -= Curl_tvdiff(after, before); + if(timeout_ms < 0) { + failf(data, "connect() timed out!"); + return CURLE_OPERATION_TIMEDOUT; + } + before = after; + } /* end of connect-to-each-address loop */ + + *sockconn = sockfd; /* the socket descriptor we've connected */ + + if(sockfd == CURL_SOCKET_BAD) { + /* no good connect was made */ + failf(data, "couldn't connect to host"); + return CURLE_COULDNT_CONNECT; + } + + /* leave the socket in non-blocking mode */ + + /* store the address we use */ + if(addr) + *addr = curr_addr; + + data->info.numconnects++; /* to track the number of connections made */ + + return CURLE_OK; +} + +/* + * 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_socket_t Curl_getconnectinfo(struct SessionHandle *data, + struct connectdata **connp) +{ + curl_socket_t sockfd; + if((data->state.lastconnect != -1) && + (data->state.connc->connects[data->state.lastconnect] != NULL)) { + struct connectdata *c = + data->state.connc->connects[data->state.lastconnect]; + 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; +} |