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cf-socket.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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 https://curl.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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#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_LINUX_TCP_H
#include <linux/tcp.h>
#elif defined(HAVE_NETINET_TCP_H)
#include <netinet/tcp.h>
#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
#ifdef __VMS
#include <in.h>
#include <inet.h>
#endif
#include "urldata.h"
#include "sendf.h"
#include "if2ip.h"
#include "strerror.h"
#include "cfilters.h"
#include "cf-socket.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 "progress.h"
#include "warnless.h"
#include "conncache.h"
#include "multihandle.h"
#include "share.h"
#include "version_win32.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
static void tcpnodelay(struct Curl_easy *data, curl_socket_t sockfd)
{
#if defined(TCP_NODELAY)
curl_socklen_t onoff = (curl_socklen_t) 1;
int level = IPPROTO_TCP;
#if !defined(CURL_DISABLE_VERBOSE_STRINGS)
char buffer[STRERROR_LEN];
#else
(void) data;
#endif
if(setsockopt(sockfd, level, TCP_NODELAY, (void *)&onoff,
sizeof(onoff)) < 0)
infof(data, "Could not set TCP_NODELAY: %s",
Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
#else
(void)data;
(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 Curl_easy *data,
curl_socket_t sockfd)
{
int onoff = 1;
if(setsockopt(sockfd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&onoff,
sizeof(onoff)) < 0) {
#if !defined(CURL_DISABLE_VERBOSE_STRINGS)
char buffer[STRERROR_LEN];
infof(data, "Could not set SO_NOSIGPIPE: %s",
Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
#endif
}
}
#else
#define nosigpipe(x,y) Curl_nop_stmt
#endif
#if defined(__DragonFly__) || defined(HAVE_WINSOCK2_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 Curl_easy *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", 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",
(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", sockfd);
}
#elif defined(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", 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", sockfd);
}
#endif
#endif
}
}
void Curl_sock_assign_addr(struct Curl_sockaddr_ex *dest,
const struct Curl_addrinfo *ai,
int transport)
{
/*
* 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.
*/
dest->family = ai->ai_family;
switch(transport) {
case TRNSPRT_TCP:
dest->socktype = SOCK_STREAM;
dest->protocol = IPPROTO_TCP;
break;
case TRNSPRT_UNIX:
dest->socktype = SOCK_STREAM;
dest->protocol = IPPROTO_IP;
break;
default: /* UDP and QUIC */
dest->socktype = SOCK_DGRAM;
dest->protocol = IPPROTO_UDP;
break;
}
dest->addrlen = ai->ai_addrlen;
if(dest->addrlen > sizeof(struct Curl_sockaddr_storage))
dest->addrlen = sizeof(struct Curl_sockaddr_storage);
memcpy(&dest->sa_addr, ai->ai_addr, dest->addrlen);
}
static CURLcode socket_open(struct Curl_easy *data,
struct Curl_sockaddr_ex *addr,
curl_socket_t *sockfd)
{
DEBUGASSERT(data);
DEBUGASSERT(data->conn);
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.
*/
Curl_set_in_callback(data, true);
*sockfd = data->set.fopensocket(data->set.opensocket_client,
CURLSOCKTYPE_IPCXN,
(struct curl_sockaddr *)addr);
Curl_set_in_callback(data, false);
}
else {
/* opensocket callback not set, so simply create the socket now */
*sockfd = socket(addr->family, addr->socktype, addr->protocol);
if(!*sockfd && addr->socktype == SOCK_DGRAM) {
/* This is icky and seems, at least, to happen on macOS:
* we get sockfd == 0 and if called again, we get a valid one > 0.
* If we close the 0, we sometimes get failures in multi poll, as
* 0 seems also be the fd for the sockpair used for WAKEUP polling.
* Very strange. Maybe this code should be ifdef'ed for macOS, but
* on "real" OS, fd 0 is stdin and we never see that. So...
*/
fake_sclose(*sockfd);
*sockfd = socket(addr->family, addr->socktype, addr->protocol);
DEBUGF(infof(data, "QUIRK: UDP socket() gave handle 0, 2nd attempt %d",
(int)*sockfd));
}
}
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(data->conn->scope_id && (addr->family == AF_INET6)) {
struct sockaddr_in6 * const sa6 = (void *)&addr->sa_addr;
sa6->sin6_scope_id = data->conn->scope_id;
}
#endif
return CURLE_OK;
}
/*
* 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!
*
*/
CURLcode Curl_socket_open(struct Curl_easy *data,
const struct Curl_addrinfo *ai,
struct Curl_sockaddr_ex *addr,
int transport,
curl_socket_t *sockfd)
{
struct Curl_sockaddr_ex dummy;
if(!addr)
/* if the caller doesn't want info back, use a local temp copy */
addr = &dummy;
Curl_sock_assign_addr(addr, ai, transport);
return socket_open(data, addr, sockfd);
}
static int socket_close(struct Curl_easy *data, struct connectdata *conn,
int use_callback, curl_socket_t sock)
{
if(use_callback && conn && conn->fclosesocket) {
int rc;
Curl_multi_closed(data, sock);
Curl_set_in_callback(data, true);
rc = conn->fclosesocket(conn->closesocket_client, sock);
Curl_set_in_callback(data, false);
return rc;
}
if(conn)
/* tell the multi-socket code about this */
Curl_multi_closed(data, sock);
sclose(sock);
return 0;
}
/*
* Close a socket.
*
* 'conn' can be NULL, beware!
*/
int Curl_socket_close(struct Curl_easy *data, struct connectdata *conn,
curl_socket_t sock)
{
return socket_close(data, conn, FALSE, sock);
}
bool Curl_socket_is_dead(curl_socket_t sock)
{
int sval;
bool ret_val = TRUE;
sval = SOCKET_READABLE(sock, 0);
if(sval == 0)
/* timeout */
ret_val = FALSE;
return ret_val;
}
#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.
https://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);
static int detectOsState = DETECT_OS_NONE;
if(detectOsState == DETECT_OS_NONE) {
if(curlx_verify_windows_version(6, 0, 0, PLATFORM_WINNT,
VERSION_GREATER_THAN_EQUAL))
detectOsState = DETECT_OS_VISTA_OR_LATER;
else
detectOsState = DETECT_OS_PREVISTA;
}
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
static CURLcode bindlocal(struct Curl_easy *data, struct connectdata *conn,
curl_socket_t sockfd, int af, unsigned int scope)
{
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;
#ifdef IP_BIND_ADDRESS_NO_PORT
int on = 1;
#endif
#ifndef ENABLE_IPV6
(void)scope;
#endif
/*************************************************************
* 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) {
#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.
*
* interface might be a VRF, eg: vrf-blue, which means it cannot be
* converted to an IP address and would fail Curl_if2ip. Simply try
* to use it straight away.
*/
if(setsockopt(sockfd, SOL_SOCKET, SO_BINDTODEVICE,
dev, (curl_socklen_t)strlen(dev) + 1) == 0) {
/* This is typically "errno 1, error: Operation not permitted" if
* you're not running as root or another suitable privileged
* user.
* If it succeeds it means the parameter was a valid interface and
* not an IP address. Return immediately.
*/
return CURLE_OK;
}
#endif
switch(Curl_if2ip(af,
#ifdef ENABLE_IPV6
scope, conn->scope_id,
#endif
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",
dev, myhost, af);
done = 1;
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.
*/
unsigned char 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(data, dev, 0, FALSE, &h);
if(rc == CURLRESOLV_PENDING)
(void)Curl_resolver_wait_resolv(data, &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",
dev, af, myhost, h->addr->ai_family);
Curl_resolv_unlock(data, h);
if(af != h->addr->ai_family) {
/* bad IP version combo, signal the caller to try another address
family if available */
return CURLE_UNSUPPORTED_PROTOCOL;
}
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 */
unsigned long scope_id = strtoul(scope_ptr, NULL, 10);
if(scope_id > UINT_MAX)
return CURLE_UNSUPPORTED_PROTOCOL;
si6->sin6_scope_id = (unsigned int)scope_id;
}
#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) {
/* errorbuf is set false so failf will overwrite any message already in
the error buffer, so the user receives this error message instead of a
generic resolve error. */
data->state.errorbuf = FALSE;
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);
}
}
#ifdef IP_BIND_ADDRESS_NO_PORT
(void)setsockopt(sockfd, SOL_IP, IP_BIND_ADDRESS_NO_PORT, &on, sizeof(on));
#endif
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) {
char buffer[STRERROR_LEN];
data->state.os_errno = error = SOCKERRNO;
failf(data, "getsockname() failed with errno %d: %s",
error, Curl_strerror(error, buffer, sizeof(buffer)));
return CURLE_INTERFACE_FAILED;
}
infof(data, "Local port: %hu", port);
conn->bits.bound = TRUE;
return CURLE_OK;
}
if(--portnum > 0) {
port++; /* try next port */
if(port == 0)
break;
infof(data, "Bind to local port %hu failed, trying next", port - 1);
/* 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;
}
{
char buffer[STRERROR_LEN];
data->state.os_errno = error = SOCKERRNO;
failf(data, "bind failed with errno %d: %s",
error, Curl_strerror(error, buffer, sizeof(buffer)));
}
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
#if defined(EBADIOCTL) && defined(__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;
}
CURLcode Curl_socket_connect_result(struct Curl_easy *data,
const char *ipaddress, int error)
{
char buffer[STRERROR_LEN];
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
return CURLE_OK;
default:
/* unknown error, fallthrough and try another address! */
infof(data, "Immediate connect fail for %s: %s",
ipaddress, Curl_strerror(error, buffer, sizeof(buffer)));
data->state.os_errno = error;
/* connect failed */
return CURLE_COULDNT_CONNECT;
}
}
#ifdef USE_RECV_BEFORE_SEND_WORKAROUND
struct io_buffer {
char *bufr;
size_t allc; /* size of the current allocation */
size_t head; /* bufr index for next read */
size_t tail; /* bufr index for next write */
};
static void io_buffer_reset(struct io_buffer *iob)
{
if(iob->bufr)
free(iob->bufr);
memset(iob, 0, sizeof(*iob));
}
#endif /* USE_RECV_BEFORE_SEND_WORKAROUND */
struct cf_socket_ctx {
int transport;
struct Curl_sockaddr_ex addr; /* address to connect to */
curl_socket_t sock; /* current attempt socket */
#ifdef USE_RECV_BEFORE_SEND_WORKAROUND
struct io_buffer recv_buffer;
#endif
char r_ip[MAX_IPADR_LEN]; /* remote IP as string */
int r_port; /* remote port number */
char l_ip[MAX_IPADR_LEN]; /* local IP as string */
int l_port; /* local port number */
struct curltime started_at; /* when socket was created */
struct curltime connected_at; /* when socket connected/got first byte */
struct curltime first_byte_at; /* when first byte was recvd */
int error; /* errno of last failure or 0 */
BIT(got_first_byte); /* if first byte was received */
BIT(accepted); /* socket was accepted, not connected */
BIT(active);
};
static void cf_socket_ctx_init(struct cf_socket_ctx *ctx,
const struct Curl_addrinfo *ai,
int transport)
{
memset(ctx, 0, sizeof(*ctx));
ctx->sock = CURL_SOCKET_BAD;
ctx->transport = transport;
Curl_sock_assign_addr(&ctx->addr, ai, transport);
}
static void cf_socket_close(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct cf_socket_ctx *ctx = cf->ctx;
if(ctx && CURL_SOCKET_BAD != ctx->sock) {
if(ctx->active) {
/* We share our socket at cf->conn->sock[cf->sockindex] when active.
* If it is no longer there, someone has stolen (and hopefully
* closed it) and we just forget about it.
*/
if(ctx->sock == cf->conn->sock[cf->sockindex]) {
DEBUGF(LOG_CF(data, cf, "cf_socket_close(%d, active)",
(int)ctx->sock));
socket_close(data, cf->conn, !ctx->accepted, ctx->sock);
cf->conn->sock[cf->sockindex] = CURL_SOCKET_BAD;
}
else {
DEBUGF(LOG_CF(data, cf, "cf_socket_close(%d) no longer at "
"conn->sock[], discarding", (int)ctx->sock));
/* TODO: we do not want this to happen. Need to check which
* code is messing with conn->sock[cf->sockindex] */
}
ctx->sock = CURL_SOCKET_BAD;
if(cf->sockindex == FIRSTSOCKET)
cf->conn->remote_addr = NULL;
}
else {
/* this is our local socket, we did never publish it */
DEBUGF(LOG_CF(data, cf, "cf_socket_close(%d, not active)",
(int)ctx->sock));
sclose(ctx->sock);
ctx->sock = CURL_SOCKET_BAD;
}
#ifdef USE_RECV_BEFORE_SEND_WORKAROUND
io_buffer_reset(&ctx->recv_buffer);
#endif
ctx->active = FALSE;
memset(&ctx->started_at, 0, sizeof(ctx->started_at));
memset(&ctx->connected_at, 0, sizeof(ctx->connected_at));
}
cf->connected = FALSE;
}
static void cf_socket_destroy(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct cf_socket_ctx *ctx = cf->ctx;
cf_socket_close(cf, data);
DEBUGF(LOG_CF(data, cf, "destroy"));
free(ctx);
cf->ctx = NULL;
}
static CURLcode set_local_ip(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_socket_ctx *ctx = cf->ctx;
#ifdef HAVE_GETSOCKNAME
char buffer[STRERROR_LEN];
struct Curl_sockaddr_storage ssloc;
curl_socklen_t slen = sizeof(struct Curl_sockaddr_storage);
memset(&ssloc, 0, sizeof(ssloc));
if(getsockname(ctx->sock, (struct sockaddr*) &ssloc, &slen)) {
int error = SOCKERRNO;
failf(data, "getsockname() failed with errno %d: %s",
error, Curl_strerror(error, buffer, sizeof(buffer)));
return CURLE_FAILED_INIT;
}
if(!Curl_addr2string((struct sockaddr*)&ssloc, slen,
ctx->l_ip, &ctx->l_port)) {
failf(data, "ssloc inet_ntop() failed with errno %d: %s",
errno, Curl_strerror(errno, buffer, sizeof(buffer)));
return CURLE_FAILED_INIT;
}
#else
(void)data;
ctx->l_ip[0] = 0;
ctx->l_port = -1;
#endif
return CURLE_OK;
}
static CURLcode set_remote_ip(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_socket_ctx *ctx = cf->ctx;
/* store remote address and port used in this connection attempt */
if(!Curl_addr2string(&ctx->addr.sa_addr, ctx->addr.addrlen,
ctx->r_ip, &ctx->r_port)) {
char buffer[STRERROR_LEN];
ctx->error = errno;
/* malformed address or bug in inet_ntop, try next address */
failf(data, "sa_addr inet_ntop() failed with errno %d: %s",
errno, Curl_strerror(errno, buffer, sizeof(buffer)));
return CURLE_FAILED_INIT;
}
return CURLE_OK;
}
static CURLcode cf_socket_open(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_socket_ctx *ctx = cf->ctx;
int error = 0;
bool isconnected = FALSE;
CURLcode result = CURLE_COULDNT_CONNECT;
bool is_tcp;
const char *ipmsg;
(void)data;
DEBUGASSERT(ctx->sock == CURL_SOCKET_BAD);
ctx->started_at = Curl_now();
result = socket_open(data, &ctx->addr, &ctx->sock);
if(result)
goto out;
result = set_remote_ip(cf, data);
if(result)
goto out;
#ifdef ENABLE_IPV6
if(ctx->addr.family == AF_INET6)
ipmsg = " Trying [%s]:%d...";
else
#endif
ipmsg = " Trying %s:%d...";
infof(data, ipmsg, ctx->r_ip, ctx->r_port);
#ifdef ENABLE_IPV6
is_tcp = (ctx->addr.family == AF_INET
|| ctx->addr.family == AF_INET6) &&
ctx->addr.socktype == SOCK_STREAM;
#else
is_tcp = (ctx->addr.family == AF_INET) &&
ctx->addr.socktype == SOCK_STREAM;
#endif
if(is_tcp && data->set.tcp_nodelay)
tcpnodelay(data, ctx->sock);
nosigpipe(data, ctx->sock);
Curl_sndbufset(ctx->sock);
if(is_tcp && data->set.tcp_keepalive)
tcpkeepalive(data, ctx->sock);
if(data->set.fsockopt) {
/* activate callback for setting socket options */
Curl_set_in_callback(data, true);
error = data->set.fsockopt(data->set.sockopt_client,
ctx->sock,
CURLSOCKTYPE_IPCXN);
Curl_set_in_callback(data, false);
if(error == CURL_SOCKOPT_ALREADY_CONNECTED)
isconnected = TRUE;
else if(error) {
result = CURLE_ABORTED_BY_CALLBACK;
goto out;
}
}
/* possibly bind the local end to an IP, interface or port */
if(ctx->addr.family == AF_INET
#ifdef ENABLE_IPV6
|| ctx->addr.family == AF_INET6
#endif
) {
result = bindlocal(data, cf->conn, ctx->sock, ctx->addr.family,
Curl_ipv6_scope(&ctx->addr.sa_addr));
if(result) {
if(result == CURLE_UNSUPPORTED_PROTOCOL) {
/* The address family is not supported on this interface.
We can continue trying addresses */
result = CURLE_COULDNT_CONNECT;
}
goto out;
}
}
/* set socket non-blocking */
(void)curlx_nonblock(ctx->sock, TRUE);
out:
if(result) {
if(ctx->sock != CURL_SOCKET_BAD) {
socket_close(data, cf->conn, TRUE, ctx->sock);
ctx->sock = CURL_SOCKET_BAD;
}
}
else if(isconnected) {