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82ba603da4
curl/lib/cfilters.c
Stefan Eissing 37b5cf4fa0
cfilter: provide call to tell connection to forget a socket 
- fixed libssh.c workaround for a socket being closed by
  the library
- eliminate the terrible hack in cf-socket.c to guess when
  this happened and try not closing the socket again.
- fixes race in eyeballing when socket could have failed to
  be closed for a discarded connect attempt

Closes #12207
2023-10-27 16:59:13 +02:00

803 lines
22 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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.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"
#include "urldata.h"
#include "strerror.h"
#include "cfilters.h"
#include "connect.h"
#include "url.h" /* for Curl_safefree() */
#include "sendf.h"
#include "sockaddr.h" /* required for Curl_sockaddr_storage */
#include "multiif.h"
#include "progress.h"
#include "select.h"
#include "warnless.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#ifndef ARRAYSIZE
#define ARRAYSIZE(A) (sizeof(A)/sizeof((A)[0]))
#endif
#ifdef DEBUGBUILD
/* used by unit2600.c */
void Curl_cf_def_close(struct Curl_cfilter *cf, struct Curl_easy *data)
{
cf->connected = FALSE;
if(cf->next)
cf->next->cft->do_close(cf->next, data);
}
#endif
static void conn_report_connect_stats(struct Curl_easy *data,
struct connectdata *conn);
void Curl_cf_def_get_host(struct Curl_cfilter *cf, struct Curl_easy *data,
const char **phost, const char **pdisplay_host,
int *pport)
{
if(cf->next)
cf->next->cft->get_host(cf->next, data, phost, pdisplay_host, pport);
else {
*phost = cf->conn->host.name;
*pdisplay_host = cf->conn->host.dispname;
*pport = cf->conn->port;
}
}
void Curl_cf_def_adjust_pollset(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct easy_pollset *ps)
{
/* NOP */
(void)cf;
(void)data;
(void)ps;
}
bool Curl_cf_def_data_pending(struct Curl_cfilter *cf,
const struct Curl_easy *data)
{
return cf->next?
cf->next->cft->has_data_pending(cf->next, data) : FALSE;
}
ssize_t Curl_cf_def_send(struct Curl_cfilter *cf, struct Curl_easy *data,
const void *buf, size_t len, CURLcode *err)
{
return cf->next?
cf->next->cft->do_send(cf->next, data, buf, len, err) :
CURLE_RECV_ERROR;
}
ssize_t Curl_cf_def_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
char *buf, size_t len, CURLcode *err)
{
return cf->next?
cf->next->cft->do_recv(cf->next, data, buf, len, err) :
CURLE_SEND_ERROR;
}
bool Curl_cf_def_conn_is_alive(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool *input_pending)
{
return cf->next?
cf->next->cft->is_alive(cf->next, data, input_pending) :
FALSE; /* pessimistic in absence of data */
}
CURLcode Curl_cf_def_conn_keep_alive(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
return cf->next?
cf->next->cft->keep_alive(cf->next, data) :
CURLE_OK;
}
CURLcode Curl_cf_def_query(struct Curl_cfilter *cf,
struct Curl_easy *data,
int query, int *pres1, void *pres2)
{
return cf->next?
cf->next->cft->query(cf->next, data, query, pres1, pres2) :
CURLE_UNKNOWN_OPTION;
}
void Curl_conn_cf_discard_chain(struct Curl_cfilter **pcf,
struct Curl_easy *data)
{
struct Curl_cfilter *cfn, *cf = *pcf;
if(cf) {
*pcf = NULL;
while(cf) {
cfn = cf->next;
/* prevent destroying filter to mess with its sub-chain, since
* we have the reference now and will call destroy on it.
*/
cf->next = NULL;
cf->cft->destroy(cf, data);
free(cf);
cf = cfn;
}
}
}
void Curl_conn_cf_discard_all(struct Curl_easy *data,
struct connectdata *conn, int index)
{
Curl_conn_cf_discard_chain(&conn->cfilter[index], data);
}
void Curl_conn_close(struct Curl_easy *data, int index)
{
struct Curl_cfilter *cf;
DEBUGASSERT(data->conn);
/* it is valid to call that without filters being present */
cf = data->conn->cfilter[index];
if(cf) {
cf->cft->do_close(cf, data);
}
}
ssize_t Curl_conn_recv(struct Curl_easy *data, int num, char *buf,
size_t len, CURLcode *code)
{
struct Curl_cfilter *cf;
DEBUGASSERT(data);
DEBUGASSERT(data->conn);
cf = data->conn->cfilter[num];
while(cf && !cf->connected) {
cf = cf->next;
}
if(cf) {
return cf->cft->do_recv(cf, data, buf, len, code);
}
failf(data, "recv: no filter connected");
*code = CURLE_FAILED_INIT;
return -1;
}
ssize_t Curl_conn_send(struct Curl_easy *data, int num,
const void *mem, size_t len, CURLcode *code)
{
struct Curl_cfilter *cf;
DEBUGASSERT(data);
DEBUGASSERT(data->conn);
cf = data->conn->cfilter[num];
while(cf && !cf->connected) {
cf = cf->next;
}
if(cf) {
return cf->cft->do_send(cf, data, mem, len, code);
}
failf(data, "send: no filter connected");
DEBUGASSERT(0);
*code = CURLE_FAILED_INIT;
return -1;
}
CURLcode Curl_cf_create(struct Curl_cfilter **pcf,
const struct Curl_cftype *cft,
void *ctx)
{
struct Curl_cfilter *cf;
CURLcode result = CURLE_OUT_OF_MEMORY;
DEBUGASSERT(cft);
cf = calloc(sizeof(*cf), 1);
if(!cf)
goto out;
cf->cft = cft;
cf->ctx = ctx;
result = CURLE_OK;
out:
*pcf = cf;
return result;
}
void Curl_conn_cf_add(struct Curl_easy *data,
struct connectdata *conn,
int index,
struct Curl_cfilter *cf)
{
(void)data;
DEBUGASSERT(conn);
DEBUGASSERT(!cf->conn);
DEBUGASSERT(!cf->next);
cf->next = conn->cfilter[index];
cf->conn = conn;
cf->sockindex = index;
conn->cfilter[index] = cf;
CURL_TRC_CF(data, cf, "added");
}
void Curl_conn_cf_insert_after(struct Curl_cfilter *cf_at,
struct Curl_cfilter *cf_new)
{
struct Curl_cfilter *tail, **pnext;
DEBUGASSERT(cf_at);
DEBUGASSERT(cf_new);
DEBUGASSERT(!cf_new->conn);
tail = cf_at->next;
cf_at->next = cf_new;
do {
cf_new->conn = cf_at->conn;
cf_new->sockindex = cf_at->sockindex;
pnext = &cf_new->next;
cf_new = cf_new->next;
} while(cf_new);
*pnext = tail;
}
bool Curl_conn_cf_discard_sub(struct Curl_cfilter *cf,
struct Curl_cfilter *discard,
struct Curl_easy *data,
bool destroy_always)
{
struct Curl_cfilter **pprev = &cf->next;
bool found = FALSE;
/* remove from sub-chain and destroy */
DEBUGASSERT(cf);
while(*pprev) {
if(*pprev == cf) {
*pprev = discard->next;
discard->next = NULL;
found = TRUE;
break;
}
pprev = &((*pprev)->next);
}
if(found || destroy_always) {
discard->next = NULL;
discard->cft->destroy(discard, data);
free(discard);
}
return found;
}
CURLcode Curl_conn_cf_connect(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool blocking, bool *done)
{
if(cf)
return cf->cft->do_connect(cf, data, blocking, done);
return CURLE_FAILED_INIT;
}
void Curl_conn_cf_close(struct Curl_cfilter *cf, struct Curl_easy *data)
{
if(cf)
cf->cft->do_close(cf, data);
}
ssize_t Curl_conn_cf_send(struct Curl_cfilter *cf, struct Curl_easy *data,
const void *buf, size_t len, CURLcode *err)
{
if(cf)
return cf->cft->do_send(cf, data, buf, len, err);
*err = CURLE_SEND_ERROR;
return -1;
}
ssize_t Curl_conn_cf_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
char *buf, size_t len, CURLcode *err)
{
if(cf)
return cf->cft->do_recv(cf, data, buf, len, err);
*err = CURLE_RECV_ERROR;
return -1;
}
CURLcode Curl_conn_connect(struct Curl_easy *data,
int sockindex,
bool blocking,
bool *done)
{
struct Curl_cfilter *cf;
CURLcode result = CURLE_OK;
DEBUGASSERT(data);
DEBUGASSERT(data->conn);
cf = data->conn->cfilter[sockindex];
DEBUGASSERT(cf);
if(!cf)
return CURLE_FAILED_INIT;
*done = cf->connected;
if(!*done) {
result = cf->cft->do_connect(cf, data, blocking, done);
if(!result && *done) {
Curl_conn_ev_update_info(data, data->conn);
conn_report_connect_stats(data, data->conn);
data->conn->keepalive = Curl_now();
}
else if(result) {
conn_report_connect_stats(data, data->conn);
}
}
return result;
}
bool Curl_conn_is_connected(struct connectdata *conn, int sockindex)
{
struct Curl_cfilter *cf;
cf = conn->cfilter[sockindex];
return cf && cf->connected;
}
bool Curl_conn_is_ip_connected(struct Curl_easy *data, int sockindex)
{
struct Curl_cfilter *cf;
cf = data->conn->cfilter[sockindex];
while(cf) {
if(cf->connected)
return TRUE;
if(cf->cft->flags & CF_TYPE_IP_CONNECT)
return FALSE;
cf = cf->next;
}
return FALSE;
}
bool Curl_conn_cf_is_ssl(struct Curl_cfilter *cf)
{
for(; cf; cf = cf->next) {
if(cf->cft->flags & CF_TYPE_SSL)
return TRUE;
if(cf->cft->flags & CF_TYPE_IP_CONNECT)
return FALSE;
}
return FALSE;
}
bool Curl_conn_is_ssl(struct connectdata *conn, int sockindex)
{
return conn? Curl_conn_cf_is_ssl(conn->cfilter[sockindex]) : FALSE;
}
bool Curl_conn_is_multiplex(struct connectdata *conn, int sockindex)
{
struct Curl_cfilter *cf = conn? conn->cfilter[sockindex] : NULL;
for(; cf; cf = cf->next) {
if(cf->cft->flags & CF_TYPE_MULTIPLEX)
return TRUE;
if(cf->cft->flags & CF_TYPE_IP_CONNECT
|| cf->cft->flags & CF_TYPE_SSL)
return FALSE;
}
return FALSE;
}
bool Curl_conn_data_pending(struct Curl_easy *data, int sockindex)
{
struct Curl_cfilter *cf;
(void)data;
DEBUGASSERT(data);
DEBUGASSERT(data->conn);
cf = data->conn->cfilter[sockindex];
while(cf && !cf->connected) {
cf = cf->next;
}
if(cf) {
return cf->cft->has_data_pending(cf, data);
}
return FALSE;
}
void Curl_conn_cf_adjust_pollset(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct easy_pollset *ps)
{
/* Get the lowest not-connected filter, if there are any */
while(cf && !cf->connected && cf->next && !cf->next->connected)
cf = cf->next;
/* From there on, give all filters a chance to adjust the pollset.
* Lower filters are called later, so they may override */
while(cf) {
cf->cft->adjust_pollset(cf, data, ps);
cf = cf->next;
}
}
void Curl_conn_adjust_pollset(struct Curl_easy *data,
struct easy_pollset *ps)
{
int i;
DEBUGASSERT(data);
DEBUGASSERT(data->conn);
for(i = 0; i < 2; ++i) {
Curl_conn_cf_adjust_pollset(data->conn->cfilter[i], data, ps);
}
}
void Curl_conn_get_host(struct Curl_easy *data, int sockindex,
const char **phost, const char **pdisplay_host,
int *pport)
{
struct Curl_cfilter *cf;
DEBUGASSERT(data->conn);
cf = data->conn->cfilter[sockindex];
if(cf) {
cf->cft->get_host(cf, data, phost, pdisplay_host, pport);
}
else {
/* Some filter ask during shutdown for this, mainly for debugging
* purposes. We hand out the defaults, however this is not always
* accurate, as the connection might be tunneled, etc. But all that
* state is already gone here. */
*phost = data->conn->host.name;
*pdisplay_host = data->conn->host.dispname;
*pport = data->conn->remote_port;
}
}
CURLcode Curl_cf_def_cntrl(struct Curl_cfilter *cf,
struct Curl_easy *data,
int event, int arg1, void *arg2)
{
(void)cf;
(void)data;
(void)event;
(void)arg1;
(void)arg2;
return CURLE_OK;
}
CURLcode Curl_conn_cf_cntrl(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool ignore_result,
int event, int arg1, void *arg2)
{
CURLcode result = CURLE_OK;
for(; cf; cf = cf->next) {
if(Curl_cf_def_cntrl == cf->cft->cntrl)
continue;
result = cf->cft->cntrl(cf, data, event, arg1, arg2);
if(!ignore_result && result)
break;
}
return result;
}
curl_socket_t Curl_conn_cf_get_socket(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
curl_socket_t sock;
if(cf && !cf->cft->query(cf, data, CF_QUERY_SOCKET, NULL, &sock))
return sock;
return CURL_SOCKET_BAD;
}
curl_socket_t Curl_conn_get_socket(struct Curl_easy *data, int sockindex)
{
struct Curl_cfilter *cf;
cf = data->conn? data->conn->cfilter[sockindex] : NULL;
/* if the top filter has not connected, ask it (and its sub-filters)
* for the socket. Otherwise conn->sock[sockindex] should have it.
*/
if(cf && !cf->connected)
return Curl_conn_cf_get_socket(cf, data);
return data->conn? data->conn->sock[sockindex] : CURL_SOCKET_BAD;
}
void Curl_conn_forget_socket(struct Curl_easy *data, int sockindex)
{
if(data->conn) {
struct Curl_cfilter *cf = data->conn->cfilter[sockindex];
if(cf)
(void)Curl_conn_cf_cntrl(cf, data, TRUE,
CF_CTRL_FORGET_SOCKET, 0, NULL);
fake_sclose(data->conn->sock[sockindex]);
data->conn->sock[sockindex] = CURL_SOCKET_BAD;
}
}
static CURLcode cf_cntrl_all(struct connectdata *conn,
struct Curl_easy *data,
bool ignore_result,
int event, int arg1, void *arg2)
{
CURLcode result = CURLE_OK;
size_t i;
for(i = 0; i < ARRAYSIZE(conn->cfilter); ++i) {
result = Curl_conn_cf_cntrl(conn->cfilter[i], data, ignore_result,
event, arg1, arg2);
if(!ignore_result && result)
break;
}
return result;
}
void Curl_conn_ev_data_attach(struct connectdata *conn,
struct Curl_easy *data)
{
cf_cntrl_all(conn, data, TRUE, CF_CTRL_DATA_ATTACH, 0, NULL);
}
void Curl_conn_ev_data_detach(struct connectdata *conn,
struct Curl_easy *data)
{
cf_cntrl_all(conn, data, TRUE, CF_CTRL_DATA_DETACH, 0, NULL);
}
CURLcode Curl_conn_ev_data_setup(struct Curl_easy *data)
{
return cf_cntrl_all(data->conn, data, FALSE,
CF_CTRL_DATA_SETUP, 0, NULL);
}
CURLcode Curl_conn_ev_data_idle(struct Curl_easy *data)
{
return cf_cntrl_all(data->conn, data, FALSE,
CF_CTRL_DATA_IDLE, 0, NULL);
}
/**
* Notify connection filters that the transfer represented by `data`
* is donw with sending data (e.g. has uploaded everything).
*/
void Curl_conn_ev_data_done_send(struct Curl_easy *data)
{
cf_cntrl_all(data->conn, data, TRUE, CF_CTRL_DATA_DONE_SEND, 0, NULL);
}
/**
* Notify connection filters that the transfer represented by `data`
* is finished - eventually premature, e.g. before being complete.
*/
void Curl_conn_ev_data_done(struct Curl_easy *data, bool premature)
{
cf_cntrl_all(data->conn, data, TRUE, CF_CTRL_DATA_DONE, premature, NULL);
}
CURLcode Curl_conn_ev_data_pause(struct Curl_easy *data, bool do_pause)
{
return cf_cntrl_all(data->conn, data, FALSE,
CF_CTRL_DATA_PAUSE, do_pause, NULL);
}
void Curl_conn_ev_update_info(struct Curl_easy *data,
struct connectdata *conn)
{
cf_cntrl_all(conn, data, TRUE, CF_CTRL_CONN_INFO_UPDATE, 0, NULL);
}
/**
* Update connection statistics
*/
static void conn_report_connect_stats(struct Curl_easy *data,
struct connectdata *conn)
{
struct Curl_cfilter *cf = conn->cfilter[FIRSTSOCKET];
if(cf) {
struct curltime connected;
struct curltime appconnected;
memset(&connected, 0, sizeof(connected));
cf->cft->query(cf, data, CF_QUERY_TIMER_CONNECT, NULL, &connected);
if(connected.tv_sec || connected.tv_usec)
Curl_pgrsTimeWas(data, TIMER_CONNECT, connected);
memset(&appconnected, 0, sizeof(appconnected));
cf->cft->query(cf, data, CF_QUERY_TIMER_APPCONNECT, NULL, &appconnected);
if(appconnected.tv_sec || appconnected.tv_usec)
Curl_pgrsTimeWas(data, TIMER_APPCONNECT, appconnected);
}
}
bool Curl_conn_is_alive(struct Curl_easy *data, struct connectdata *conn,
bool *input_pending)
{
struct Curl_cfilter *cf = conn->cfilter[FIRSTSOCKET];
return cf && !cf->conn->bits.close &&
cf->cft->is_alive(cf, data, input_pending);
}
CURLcode Curl_conn_keep_alive(struct Curl_easy *data,
struct connectdata *conn,
int sockindex)
{
struct Curl_cfilter *cf = conn->cfilter[sockindex];
return cf? cf->cft->keep_alive(cf, data) : CURLE_OK;
}
size_t Curl_conn_get_max_concurrent(struct Curl_easy *data,
struct connectdata *conn,
int sockindex)
{
CURLcode result;
int n = 0;
struct Curl_cfilter *cf = conn->cfilter[sockindex];
result = cf? cf->cft->query(cf, data, CF_QUERY_MAX_CONCURRENT,
&n, NULL) : CURLE_UNKNOWN_OPTION;
return (result || n <= 0)? 1 : (size_t)n;
}
void Curl_pollset_reset(struct Curl_easy *data,
struct easy_pollset *ps)
{
size_t i;
(void)data;
memset(ps, 0, sizeof(*ps));
for(i = 0; i< MAX_SOCKSPEREASYHANDLE; i++)
ps->sockets[i] = CURL_SOCKET_BAD;
}
/**
*
*/
void Curl_pollset_change(struct Curl_easy *data,
struct easy_pollset *ps, curl_socket_t sock,
int add_flags, int remove_flags)
{
unsigned int i;
(void)data;
DEBUGASSERT(VALID_SOCK(sock));
if(!VALID_SOCK(sock))
return;
DEBUGASSERT(add_flags <= (CURL_POLL_IN|CURL_POLL_OUT));
DEBUGASSERT(remove_flags <= (CURL_POLL_IN|CURL_POLL_OUT));
DEBUGASSERT((add_flags&remove_flags) == 0); /* no overlap */
for(i = 0; i < ps->num; ++i) {
if(ps->sockets[i] == sock) {
ps->actions[i] &= (unsigned char)(~remove_flags);
ps->actions[i] |= (unsigned char)add_flags;
/* all gone? remove socket */
if(!ps->actions[i]) {
if((i + 1) < ps->num) {
memmove(&ps->sockets[i], &ps->sockets[i + 1],
(ps->num - (i + 1)) * sizeof(ps->sockets[0]));
memmove(&ps->actions[i], &ps->actions[i + 1],
(ps->num - (i + 1)) * sizeof(ps->actions[0]));
}
--ps->num;
}
return;
}
}
/* not present */
if(add_flags) {
/* Having more SOCKETS per easy handle than what is defined
* is a programming error. This indicates that we need
* to raise this limit, making easy_pollset larger.
* Since we use this in tight loops, we do not want to make
* the pollset dynamic unnecessarily.
* The current maximum in practise is HTTP/3 eyeballing where
* we have up to 4 sockets involved in connection setup.
*/
DEBUGASSERT(i < MAX_SOCKSPEREASYHANDLE);
if(i < MAX_SOCKSPEREASYHANDLE) {
ps->sockets[i] = sock;
ps->actions[i] = (unsigned char)add_flags;
ps->num = i + 1;
}
}
}
void Curl_pollset_set(struct Curl_easy *data,
struct easy_pollset *ps, curl_socket_t sock,
bool do_in, bool do_out)
{
Curl_pollset_change(data, ps, sock,
(do_in?CURL_POLL_IN:0)|(do_out?CURL_POLL_OUT:0),
(!do_in?CURL_POLL_IN:0)|(!do_out?CURL_POLL_OUT:0));
}
static void ps_add(struct Curl_easy *data, struct easy_pollset *ps,
int bitmap, curl_socket_t *socks)
{
if(bitmap) {
int i;
for(i = 0; i < MAX_SOCKSPEREASYHANDLE; ++i) {
if(!(bitmap & GETSOCK_MASK_RW(i)) || !VALID_SOCK((socks[i]))) {
break;
}
if(bitmap & GETSOCK_READSOCK(i)) {
if(bitmap & GETSOCK_WRITESOCK(i))
Curl_pollset_add_inout(data, ps, socks[i]);
else
/* is READ, since we checked MASK_RW above */
Curl_pollset_add_in(data, ps, socks[i]);
}
else
Curl_pollset_add_out(data, ps, socks[i]);
}
}
}
void Curl_pollset_add_socks(struct Curl_easy *data,
struct easy_pollset *ps,
int (*get_socks_cb)(struct Curl_easy *data,
struct connectdata *conn,
curl_socket_t *socks))
{
curl_socket_t socks[MAX_SOCKSPEREASYHANDLE];
int bitmap;
DEBUGASSERT(data->conn);
bitmap = get_socks_cb(data, data->conn, socks);
ps_add(data, ps, bitmap, socks);
}
void Curl_pollset_add_socks2(struct Curl_easy *data,
struct easy_pollset *ps,
int (*get_socks_cb)(struct Curl_easy *data,
curl_socket_t *socks))
{
curl_socket_t socks[MAX_SOCKSPEREASYHANDLE];
int bitmap;
bitmap = get_socks_cb(data, socks);
ps_add(data, ps, bitmap, socks);
}
void Curl_pollset_check(struct Curl_easy *data,
struct easy_pollset *ps, curl_socket_t sock,
bool *pwant_read, bool *pwant_write)
{
unsigned int i;
(void)data;
DEBUGASSERT(VALID_SOCK(sock));
for(i = 0; i < ps->num; ++i) {
if(ps->sockets[i] == sock) {
*pwant_read = !!(ps->actions[i] & CURL_POLL_IN);
*pwant_write = !!(ps->actions[i] & CURL_POLL_OUT);
return;
}
}
*pwant_read = *pwant_write = FALSE;
}
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