/
url.c
4038 lines (3525 loc) · 123 KB
/
url.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2019, 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 https://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>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#ifdef HAVE_IPHLPAPI_H
#include <Iphlpapi.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef __VMS
#include <in.h>
#include <inet.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifndef HAVE_SOCKET
#error "We can't compile without socket() support!"
#endif
#include <limits.h>
#ifdef USE_LIBIDN2
#include <idn2.h>
#elif defined(USE_WIN32_IDN)
/* prototype for curl_win32_idn_to_ascii() */
bool curl_win32_idn_to_ascii(const char *in, char **out);
#endif /* USE_LIBIDN2 */
#include "urldata.h"
#include "netrc.h"
#include "formdata.h"
#include "mime.h"
#include "vtls/vtls.h"
#include "hostip.h"
#include "transfer.h"
#include "sendf.h"
#include "progress.h"
#include "cookie.h"
#include "strcase.h"
#include "strerror.h"
#include "escape.h"
#include "strtok.h"
#include "share.h"
#include "content_encoding.h"
#include "http_digest.h"
#include "http_negotiate.h"
#include "select.h"
#include "multiif.h"
#include "easyif.h"
#include "speedcheck.h"
#include "warnless.h"
#include "non-ascii.h"
#include "inet_pton.h"
#include "getinfo.h"
#include "urlapi-int.h"
#include "system_win32.h"
/* And now for the protocols */
#include "ftp.h"
#include "dict.h"
#include "telnet.h"
#include "tftp.h"
#include "http.h"
#include "http2.h"
#include "file.h"
#include "curl_ldap.h"
#include "ssh.h"
#include "imap.h"
#include "url.h"
#include "connect.h"
#include "inet_ntop.h"
#include "http_ntlm.h"
#include "curl_rtmp.h"
#include "gopher.h"
#include "http_proxy.h"
#include "conncache.h"
#include "multihandle.h"
#include "dotdot.h"
#include "strdup.h"
#include "setopt.h"
#include "altsvc.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
static void conn_free(struct connectdata *conn);
static void free_idnconverted_hostname(struct hostname *host);
static unsigned int get_protocol_family(unsigned int protocol);
/* Some parts of the code (e.g. chunked encoding) assume this buffer has at
* more than just a few bytes to play with. Don't let it become too small or
* bad things will happen.
*/
#if READBUFFER_SIZE < READBUFFER_MIN
# error READBUFFER_SIZE is too small
#endif
/*
* Protocol table.
*/
static const struct Curl_handler * const protocols[] = {
#ifndef CURL_DISABLE_HTTP
&Curl_handler_http,
#endif
#if defined(USE_SSL) && !defined(CURL_DISABLE_HTTP)
&Curl_handler_https,
#endif
#ifndef CURL_DISABLE_FTP
&Curl_handler_ftp,
#endif
#if defined(USE_SSL) && !defined(CURL_DISABLE_FTP)
&Curl_handler_ftps,
#endif
#ifndef CURL_DISABLE_TELNET
&Curl_handler_telnet,
#endif
#ifndef CURL_DISABLE_DICT
&Curl_handler_dict,
#endif
#ifndef CURL_DISABLE_LDAP
&Curl_handler_ldap,
#if !defined(CURL_DISABLE_LDAPS) && \
((defined(USE_OPENLDAP) && defined(USE_SSL)) || \
(!defined(USE_OPENLDAP) && defined(HAVE_LDAP_SSL)))
&Curl_handler_ldaps,
#endif
#endif
#ifndef CURL_DISABLE_FILE
&Curl_handler_file,
#endif
#ifndef CURL_DISABLE_TFTP
&Curl_handler_tftp,
#endif
#if defined(USE_SSH)
&Curl_handler_scp,
#endif
#if defined(USE_SSH)
&Curl_handler_sftp,
#endif
#ifndef CURL_DISABLE_IMAP
&Curl_handler_imap,
#ifdef USE_SSL
&Curl_handler_imaps,
#endif
#endif
#ifndef CURL_DISABLE_POP3
&Curl_handler_pop3,
#ifdef USE_SSL
&Curl_handler_pop3s,
#endif
#endif
#if !defined(CURL_DISABLE_SMB) && defined(USE_NTLM) && \
(CURL_SIZEOF_CURL_OFF_T > 4) && \
(!defined(USE_WINDOWS_SSPI) || defined(USE_WIN32_CRYPTO))
&Curl_handler_smb,
#ifdef USE_SSL
&Curl_handler_smbs,
#endif
#endif
#ifndef CURL_DISABLE_SMTP
&Curl_handler_smtp,
#ifdef USE_SSL
&Curl_handler_smtps,
#endif
#endif
#ifndef CURL_DISABLE_RTSP
&Curl_handler_rtsp,
#endif
#ifndef CURL_DISABLE_GOPHER
&Curl_handler_gopher,
#endif
#ifdef USE_LIBRTMP
&Curl_handler_rtmp,
&Curl_handler_rtmpt,
&Curl_handler_rtmpe,
&Curl_handler_rtmpte,
&Curl_handler_rtmps,
&Curl_handler_rtmpts,
#endif
(struct Curl_handler *) NULL
};
/*
* Dummy handler for undefined protocol schemes.
*/
static const struct Curl_handler Curl_handler_dummy = {
"<no protocol>", /* scheme */
ZERO_NULL, /* setup_connection */
ZERO_NULL, /* do_it */
ZERO_NULL, /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
0, /* defport */
0, /* protocol */
PROTOPT_NONE /* flags */
};
void Curl_freeset(struct Curl_easy *data)
{
/* Free all dynamic strings stored in the data->set substructure. */
enum dupstring i;
for(i = (enum dupstring)0; i < STRING_LAST; i++) {
Curl_safefree(data->set.str[i]);
}
if(data->change.referer_alloc) {
Curl_safefree(data->change.referer);
data->change.referer_alloc = FALSE;
}
data->change.referer = NULL;
if(data->change.url_alloc) {
Curl_safefree(data->change.url);
data->change.url_alloc = FALSE;
}
data->change.url = NULL;
Curl_mime_cleanpart(&data->set.mimepost);
}
/* free the URL pieces */
static void up_free(struct Curl_easy *data)
{
struct urlpieces *up = &data->state.up;
Curl_safefree(up->scheme);
Curl_safefree(up->hostname);
Curl_safefree(up->port);
Curl_safefree(up->user);
Curl_safefree(up->password);
Curl_safefree(up->options);
Curl_safefree(up->path);
Curl_safefree(up->query);
curl_url_cleanup(data->state.uh);
data->state.uh = NULL;
}
/*
* This is the internal function curl_easy_cleanup() calls. This should
* cleanup and free all resources associated with this sessionhandle.
*
* NOTE: if we ever add something that attempts to write to a socket or
* similar here, we must ignore SIGPIPE first. It is currently only done
* when curl_easy_perform() is invoked.
*/
CURLcode Curl_close(struct Curl_easy *data)
{
struct Curl_multi *m;
if(!data)
return CURLE_OK;
Curl_expire_clear(data); /* shut off timers */
m = data->multi;
if(m)
/* This handle is still part of a multi handle, take care of this first
and detach this handle from there. */
curl_multi_remove_handle(data->multi, data);
if(data->multi_easy) {
/* when curl_easy_perform() is used, it creates its own multi handle to
use and this is the one */
curl_multi_cleanup(data->multi_easy);
data->multi_easy = NULL;
}
/* Destroy the timeout list that is held in the easy handle. It is
/normally/ done by curl_multi_remove_handle() but this is "just in
case" */
Curl_llist_destroy(&data->state.timeoutlist, NULL);
data->magic = 0; /* force a clear AFTER the possibly enforced removal from
the multi handle, since that function uses the magic
field! */
if(data->state.rangestringalloc)
free(data->state.range);
/* freed here just in case DONE wasn't called */
Curl_free_request_state(data);
/* Close down all open SSL info and sessions */
Curl_ssl_close_all(data);
Curl_safefree(data->state.first_host);
Curl_safefree(data->state.scratch);
Curl_ssl_free_certinfo(data);
/* Cleanup possible redirect junk */
free(data->req.newurl);
data->req.newurl = NULL;
if(data->change.referer_alloc) {
Curl_safefree(data->change.referer);
data->change.referer_alloc = FALSE;
}
data->change.referer = NULL;
up_free(data);
Curl_safefree(data->state.buffer);
Curl_safefree(data->state.headerbuff);
Curl_safefree(data->state.ulbuf);
Curl_flush_cookies(data, 1);
#ifdef USE_ALTSVC
Curl_altsvc_save(data->asi, data->set.str[STRING_ALTSVC]);
Curl_altsvc_cleanup(data->asi);
data->asi = NULL;
#endif
#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_CRYPTO_AUTH)
Curl_http_auth_cleanup_digest(data);
#endif
Curl_safefree(data->info.contenttype);
Curl_safefree(data->info.wouldredirect);
/* this destroys the channel and we cannot use it anymore after this */
Curl_resolver_cleanup(data->state.resolver);
Curl_http2_cleanup_dependencies(data);
Curl_convert_close(data);
/* No longer a dirty share, if it exists */
if(data->share) {
Curl_share_lock(data, CURL_LOCK_DATA_SHARE, CURL_LOCK_ACCESS_SINGLE);
data->share->dirty--;
Curl_share_unlock(data, CURL_LOCK_DATA_SHARE);
}
/* Leave no dangling DOH handles behind */
Curl_close(data->req.doh.probe[0].easy);
Curl_close(data->req.doh.probe[1].easy);
free(data->req.doh.probe[0].serverdoh.memory);
free(data->req.doh.probe[1].serverdoh.memory);
curl_slist_free_all(data->req.doh.headers);
/* destruct wildcard structures if it is needed */
Curl_wildcard_dtor(&data->wildcard);
Curl_freeset(data);
free(data);
return CURLE_OK;
}
/*
* Initialize the UserDefined fields within a Curl_easy.
* This may be safely called on a new or existing Curl_easy.
*/
CURLcode Curl_init_userdefined(struct Curl_easy *data)
{
struct UserDefined *set = &data->set;
CURLcode result = CURLE_OK;
set->out = stdout; /* default output to stdout */
set->in_set = stdin; /* default input from stdin */
set->err = stderr; /* default stderr to stderr */
/* use fwrite as default function to store output */
set->fwrite_func = (curl_write_callback)fwrite;
/* use fread as default function to read input */
set->fread_func_set = (curl_read_callback)fread;
set->is_fread_set = 0;
set->is_fwrite_set = 0;
set->seek_func = ZERO_NULL;
set->seek_client = ZERO_NULL;
/* conversion callbacks for non-ASCII hosts */
set->convfromnetwork = ZERO_NULL;
set->convtonetwork = ZERO_NULL;
set->convfromutf8 = ZERO_NULL;
set->filesize = -1; /* we don't know the size */
set->postfieldsize = -1; /* unknown size */
set->maxredirs = -1; /* allow any amount by default */
set->httpreq = HTTPREQ_GET; /* Default HTTP request */
set->rtspreq = RTSPREQ_OPTIONS; /* Default RTSP request */
#ifndef CURL_DISABLE_FTP
set->ftp_use_epsv = TRUE; /* FTP defaults to EPSV operations */
set->ftp_use_eprt = TRUE; /* FTP defaults to EPRT operations */
set->ftp_use_pret = FALSE; /* mainly useful for drftpd servers */
set->ftp_filemethod = FTPFILE_MULTICWD;
#endif
set->dns_cache_timeout = 60; /* Timeout every 60 seconds by default */
/* Set the default size of the SSL session ID cache */
set->general_ssl.max_ssl_sessions = 5;
set->proxyport = 0;
set->proxytype = CURLPROXY_HTTP; /* defaults to HTTP proxy */
set->httpauth = CURLAUTH_BASIC; /* defaults to basic */
set->proxyauth = CURLAUTH_BASIC; /* defaults to basic */
/* SOCKS5 proxy auth defaults to username/password + GSS-API */
set->socks5auth = CURLAUTH_BASIC | CURLAUTH_GSSAPI;
/* make libcurl quiet by default: */
set->hide_progress = TRUE; /* CURLOPT_NOPROGRESS changes these */
Curl_mime_initpart(&set->mimepost, data);
/*
* libcurl 7.10 introduced SSL verification *by default*! This needs to be
* switched off unless wanted.
*/
set->ssl.primary.verifypeer = TRUE;
set->ssl.primary.verifyhost = TRUE;
#ifdef USE_TLS_SRP
set->ssl.authtype = CURL_TLSAUTH_NONE;
#endif
set->ssh_auth_types = CURLSSH_AUTH_DEFAULT; /* defaults to any auth
type */
set->ssl.primary.sessionid = TRUE; /* session ID caching enabled by
default */
set->proxy_ssl = set->ssl;
set->new_file_perms = 0644; /* Default permissions */
set->new_directory_perms = 0755; /* Default permissions */
/* for the *protocols fields we don't use the CURLPROTO_ALL convenience
define since we internally only use the lower 16 bits for the passed
in bitmask to not conflict with the private bits */
set->allowed_protocols = CURLPROTO_ALL;
set->redir_protocols = CURLPROTO_HTTP | CURLPROTO_HTTPS | CURLPROTO_FTP |
CURLPROTO_FTPS;
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
/*
* disallow unprotected protection negotiation NEC reference implementation
* seem not to follow rfc1961 section 4.3/4.4
*/
set->socks5_gssapi_nec = FALSE;
#endif
/* Set the default CA cert bundle/path detected/specified at build time.
*
* If Schannel is the selected SSL backend then these locations are
* ignored. We allow setting CA location for schannel only when explicitly
* specified by the user via CURLOPT_CAINFO / --cacert.
*/
if(Curl_ssl_backend() != CURLSSLBACKEND_SCHANNEL) {
#if defined(CURL_CA_BUNDLE)
result = Curl_setstropt(&set->str[STRING_SSL_CAFILE_ORIG], CURL_CA_BUNDLE);
if(result)
return result;
result = Curl_setstropt(&set->str[STRING_SSL_CAFILE_PROXY],
CURL_CA_BUNDLE);
if(result)
return result;
#endif
#if defined(CURL_CA_PATH)
result = Curl_setstropt(&set->str[STRING_SSL_CAPATH_ORIG], CURL_CA_PATH);
if(result)
return result;
result = Curl_setstropt(&set->str[STRING_SSL_CAPATH_PROXY], CURL_CA_PATH);
if(result)
return result;
#endif
}
set->wildcard_enabled = FALSE;
set->chunk_bgn = ZERO_NULL;
set->chunk_end = ZERO_NULL;
set->tcp_keepalive = FALSE;
set->tcp_keepintvl = 60;
set->tcp_keepidle = 60;
set->tcp_fastopen = FALSE;
set->tcp_nodelay = TRUE;
set->ssl_enable_npn = TRUE;
set->ssl_enable_alpn = TRUE;
set->expect_100_timeout = 1000L; /* Wait for a second by default. */
set->sep_headers = TRUE; /* separated header lists by default */
set->buffer_size = READBUFFER_SIZE;
set->upload_buffer_size = UPLOADBUFFER_DEFAULT;
set->happy_eyeballs_timeout = CURL_HET_DEFAULT;
set->fnmatch = ZERO_NULL;
set->upkeep_interval_ms = CURL_UPKEEP_INTERVAL_DEFAULT;
set->maxconnects = DEFAULT_CONNCACHE_SIZE; /* for easy handles */
set->maxage_conn = 118;
set->http09_allowed = FALSE;
set->httpversion =
#ifdef USE_NGHTTP2
CURL_HTTP_VERSION_2TLS
#else
CURL_HTTP_VERSION_1_1
#endif
;
Curl_http2_init_userset(set);
return result;
}
/**
* Curl_open()
*
* @param curl is a pointer to a sessionhandle pointer that gets set by this
* function.
* @return CURLcode
*/
CURLcode Curl_open(struct Curl_easy **curl)
{
CURLcode result;
struct Curl_easy *data;
/* Very simple start-up: alloc the struct, init it with zeroes and return */
data = calloc(1, sizeof(struct Curl_easy));
if(!data) {
/* this is a very serious error */
DEBUGF(fprintf(stderr, "Error: calloc of Curl_easy failed\n"));
return CURLE_OUT_OF_MEMORY;
}
data->magic = CURLEASY_MAGIC_NUMBER;
result = Curl_resolver_init(data, &data->state.resolver);
if(result) {
DEBUGF(fprintf(stderr, "Error: resolver_init failed\n"));
free(data);
return result;
}
/* We do some initial setup here, all those fields that can't be just 0 */
data->state.buffer = malloc(READBUFFER_SIZE + 1);
if(!data->state.buffer) {
DEBUGF(fprintf(stderr, "Error: malloc of buffer failed\n"));
result = CURLE_OUT_OF_MEMORY;
}
else {
data->state.headerbuff = malloc(HEADERSIZE);
if(!data->state.headerbuff) {
DEBUGF(fprintf(stderr, "Error: malloc of headerbuff failed\n"));
result = CURLE_OUT_OF_MEMORY;
}
else {
result = Curl_init_userdefined(data);
data->state.headersize = HEADERSIZE;
Curl_convert_init(data);
Curl_initinfo(data);
/* most recent connection is not yet defined */
data->state.lastconnect = NULL;
data->progress.flags |= PGRS_HIDE;
data->state.current_speed = -1; /* init to negative == impossible */
}
}
if(result) {
Curl_resolver_cleanup(data->state.resolver);
free(data->state.buffer);
free(data->state.headerbuff);
Curl_freeset(data);
free(data);
data = NULL;
}
else
*curl = data;
return result;
}
#ifdef USE_RECV_BEFORE_SEND_WORKAROUND
static void conn_reset_postponed_data(struct connectdata *conn, int num)
{
struct postponed_data * const psnd = &(conn->postponed[num]);
if(psnd->buffer) {
DEBUGASSERT(psnd->allocated_size > 0);
DEBUGASSERT(psnd->recv_size <= psnd->allocated_size);
DEBUGASSERT(psnd->recv_size ?
(psnd->recv_processed < psnd->recv_size) :
(psnd->recv_processed == 0));
DEBUGASSERT(psnd->bindsock != CURL_SOCKET_BAD);
free(psnd->buffer);
psnd->buffer = NULL;
psnd->allocated_size = 0;
psnd->recv_size = 0;
psnd->recv_processed = 0;
#ifdef DEBUGBUILD
psnd->bindsock = CURL_SOCKET_BAD; /* used only for DEBUGASSERT */
#endif /* DEBUGBUILD */
}
else {
DEBUGASSERT(psnd->allocated_size == 0);
DEBUGASSERT(psnd->recv_size == 0);
DEBUGASSERT(psnd->recv_processed == 0);
DEBUGASSERT(psnd->bindsock == CURL_SOCKET_BAD);
}
}
static void conn_reset_all_postponed_data(struct connectdata *conn)
{
conn_reset_postponed_data(conn, 0);
conn_reset_postponed_data(conn, 1);
}
#else /* ! USE_RECV_BEFORE_SEND_WORKAROUND */
/* Use "do-nothing" macro instead of function when workaround not used */
#define conn_reset_all_postponed_data(c) do {} WHILE_FALSE
#endif /* ! USE_RECV_BEFORE_SEND_WORKAROUND */
static void conn_shutdown(struct connectdata *conn)
{
if(!conn)
return;
infof(conn->data, "Closing connection %ld\n", conn->connection_id);
DEBUGASSERT(conn->data);
/* possible left-overs from the async name resolvers */
Curl_resolver_cancel(conn);
/* close the SSL stuff before we close any sockets since they will/may
write to the sockets */
Curl_ssl_close(conn, FIRSTSOCKET);
Curl_ssl_close(conn, SECONDARYSOCKET);
/* close possibly still open sockets */
if(CURL_SOCKET_BAD != conn->sock[SECONDARYSOCKET])
Curl_closesocket(conn, conn->sock[SECONDARYSOCKET]);
if(CURL_SOCKET_BAD != conn->sock[FIRSTSOCKET])
Curl_closesocket(conn, conn->sock[FIRSTSOCKET]);
if(CURL_SOCKET_BAD != conn->tempsock[0])
Curl_closesocket(conn, conn->tempsock[0]);
if(CURL_SOCKET_BAD != conn->tempsock[1])
Curl_closesocket(conn, conn->tempsock[1]);
/* unlink ourselves. this should be called last since other shutdown
procedures need a valid conn->data and this may clear it. */
Curl_conncache_remove_conn(conn->data, conn, TRUE);
}
static void conn_free(struct connectdata *conn)
{
if(!conn)
return;
free_idnconverted_hostname(&conn->host);
free_idnconverted_hostname(&conn->conn_to_host);
free_idnconverted_hostname(&conn->http_proxy.host);
free_idnconverted_hostname(&conn->socks_proxy.host);
Curl_safefree(conn->user);
Curl_safefree(conn->passwd);
Curl_safefree(conn->oauth_bearer);
Curl_safefree(conn->sasl_authzid);
Curl_safefree(conn->options);
Curl_safefree(conn->http_proxy.user);
Curl_safefree(conn->socks_proxy.user);
Curl_safefree(conn->http_proxy.passwd);
Curl_safefree(conn->socks_proxy.passwd);
Curl_safefree(conn->allocptr.proxyuserpwd);
Curl_safefree(conn->allocptr.uagent);
Curl_safefree(conn->allocptr.userpwd);
Curl_safefree(conn->allocptr.accept_encoding);
Curl_safefree(conn->allocptr.te);
Curl_safefree(conn->allocptr.rangeline);
Curl_safefree(conn->allocptr.ref);
Curl_safefree(conn->allocptr.host);
Curl_safefree(conn->allocptr.cookiehost);
Curl_safefree(conn->allocptr.rtsp_transport);
Curl_safefree(conn->trailer);
Curl_safefree(conn->host.rawalloc); /* host name buffer */
Curl_safefree(conn->conn_to_host.rawalloc); /* host name buffer */
Curl_safefree(conn->hostname_resolve);
Curl_safefree(conn->secondaryhostname);
Curl_safefree(conn->http_proxy.host.rawalloc); /* http proxy name buffer */
Curl_safefree(conn->socks_proxy.host.rawalloc); /* socks proxy name buffer */
Curl_safefree(conn->connect_state);
conn_reset_all_postponed_data(conn);
Curl_llist_destroy(&conn->easyq, NULL);
Curl_safefree(conn->localdev);
Curl_free_primary_ssl_config(&conn->ssl_config);
Curl_free_primary_ssl_config(&conn->proxy_ssl_config);
#ifdef USE_UNIX_SOCKETS
Curl_safefree(conn->unix_domain_socket);
#endif
#ifdef USE_SSL
Curl_safefree(conn->ssl_extra);
#endif
free(conn); /* free all the connection oriented data */
}
/*
* Disconnects the given connection. Note the connection may not be the
* primary connection, like when freeing room in the connection cache or
* killing of a dead old connection.
*
* A connection needs an easy handle when closing down. We support this passed
* in separately since the connection to get closed here is often already
* disassociated from an easy handle.
*
* This function MUST NOT reset state in the Curl_easy struct if that
* isn't strictly bound to the life-time of *this* particular connection.
*
*/
CURLcode Curl_disconnect(struct Curl_easy *data,
struct connectdata *conn, bool dead_connection)
{
if(!conn)
return CURLE_OK; /* this is closed and fine already */
if(!data) {
DEBUGF(infof(data, "DISCONNECT without easy handle, ignoring\n"));
return CURLE_OK;
}
/*
* If this connection isn't marked to force-close, leave it open if there
* are other users of it
*/
if(CONN_INUSE(conn) && !dead_connection) {
DEBUGF(infof(data, "Curl_disconnect when inuse: %zu\n", CONN_INUSE(conn)));
return CURLE_OK;
}
if(conn->dns_entry != NULL) {
Curl_resolv_unlock(data, conn->dns_entry);
conn->dns_entry = NULL;
}
Curl_hostcache_prune(data); /* kill old DNS cache entries */
#if !defined(CURL_DISABLE_HTTP) && defined(USE_NTLM)
/* Cleanup NTLM connection-related data */
Curl_http_auth_cleanup_ntlm(conn);
#endif
#if !defined(CURL_DISABLE_HTTP) && defined(USE_SPNEGO)
/* Cleanup NEGOTIATE connection-related data */
Curl_http_auth_cleanup_negotiate(conn);
#endif
/* the protocol specific disconnect handler and conn_shutdown need a transfer
for the connection! */
conn->data = data;
if(conn->bits.connect_only)
/* treat the connection as dead in CONNECT_ONLY situations */
dead_connection = TRUE;
if(conn->handler->disconnect)
/* This is set if protocol-specific cleanups should be made */
conn->handler->disconnect(conn, dead_connection);
conn_shutdown(conn);
conn_free(conn);
return CURLE_OK;
}
/*
* This function should return TRUE if the socket is to be assumed to
* be dead. Most commonly this happens when the server has closed the
* connection due to inactivity.
*/
static bool SocketIsDead(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;
}
/*
* IsMultiplexingPossible()
*
* Return a bitmask with the available multiplexing options for the given
* requested connection.
*/
static int IsMultiplexingPossible(const struct Curl_easy *handle,
const struct connectdata *conn)
{
int avail = 0;
/* If a HTTP protocol and multiplexing is enabled */
if((conn->handler->protocol & PROTO_FAMILY_HTTP) &&
(!conn->bits.protoconnstart || !conn->bits.close)) {
if(Curl_multiplex_wanted(handle->multi) &&
(handle->set.httpversion >= CURL_HTTP_VERSION_2))
/* allows HTTP/2 */
avail |= CURLPIPE_MULTIPLEX;
}
return avail;
}
#ifndef CURL_DISABLE_PROXY
static bool
proxy_info_matches(const struct proxy_info* data,
const struct proxy_info* needle)
{
if((data->proxytype == needle->proxytype) &&
(data->port == needle->port) &&
Curl_safe_strcasecompare(data->host.name, needle->host.name))
return TRUE;
return FALSE;
}
#else
/* disabled, won't get called */
#define proxy_info_matches(x,y) FALSE
#endif
/* A connection has to have been idle for a shorter time than 'maxage_conn' to
be subject for reuse. The success rate is just too low after this. */
static bool conn_maxage(struct Curl_easy *data,
struct connectdata *conn,
struct curltime now)
{
if(!conn->data) {
timediff_t idletime = Curl_timediff(now, conn->lastused);
idletime /= 1000; /* integer seconds is fine */
if(idletime > data->set.maxage_conn) {
infof(data, "Too old connection (%ld seconds), disconnect it\n",
idletime);
return TRUE;
}
}
return FALSE;
}
/*
* This function checks if the given connection is dead and extracts it from
* the connection cache if so.
*
* When this is called as a Curl_conncache_foreach() callback, the connection
* cache lock is held!
*
* Returns TRUE if the connection was dead and extracted.
*/
static bool extract_if_dead(struct connectdata *conn,
struct Curl_easy *data)
{
if(!CONN_INUSE(conn) && !conn->data) {
/* The check for a dead socket makes sense only if the connection isn't in
use */
bool dead;
struct curltime now = Curl_now();
if(conn_maxage(data, conn, now)) {
dead = TRUE;
}
else if(conn->handler->connection_check) {
/* The protocol has a special method for checking the state of the
connection. Use it to check if the connection is dead. */
unsigned int state;
struct Curl_easy *olddata = conn->data;
conn->data = data; /* use this transfer for now */
state = conn->handler->connection_check(conn, CONNCHECK_ISDEAD);
conn->data = olddata;
dead = (state & CONNRESULT_DEAD);
}
else {
/* Use the general method for determining the death of a connection */
dead = SocketIsDead(conn->sock[FIRSTSOCKET]);
}
if(dead) {
infof(data, "Connection %ld seems to be dead!\n", conn->connection_id);
Curl_conncache_remove_conn(data, conn, FALSE);
return TRUE;
}
}
return FALSE;
}
struct prunedead {
struct Curl_easy *data;
struct connectdata *extracted;
};
/*
* Wrapper to use extract_if_dead() function in Curl_conncache_foreach()
*
*/
static int call_extract_if_dead(struct connectdata *conn, void *param)
{
struct prunedead *p = (struct prunedead *)param;
if(extract_if_dead(conn, p->data)) {
/* stop the iteration here, pass back the connection that was extracted */
p->extracted = conn;
return 1;
}
return 0; /* continue iteration */
}
/*
* This function scans the connection cache for half-open/dead connections,
* closes and removes them.
* The cleanup is done at most once per second.
*/
static void prune_dead_connections(struct Curl_easy *data)
{
struct curltime now = Curl_now();
timediff_t elapsed =
Curl_timediff(now, data->state.conn_cache->last_cleanup);
if(elapsed >= 1000L) {
struct prunedead prune;
prune.data = data;
prune.extracted = NULL;
while(Curl_conncache_foreach(data, data->state.conn_cache, &prune,
call_extract_if_dead)) {
/* disconnect it */
(void)Curl_disconnect(data, prune.extracted, /* dead_connection */TRUE);
}
data->state.conn_cache->last_cleanup = now;
}
}
/*
* Given one filled in connection struct (named needle), this function should
* detect if there already is one that has all the significant details
* exactly the same and thus should be used instead.
*