curl 2022-12-21 (c12fb3dd)

Code extracted from:

    https://github.com/curl/curl.git

at commit c12fb3ddaf48e709a7a4deaa55ec485e4df163ee (curl-7_87_0).

1 files changed, 502 insertions, 0 deletions

diff --git a/lib/cfilters.c b/lib/cfilters.c
new file mode 100644
index 0000000..bcb33da
--- /dev/null
+++ b/lib/cfilters.c
@@ -0,0 +1,502 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2022, 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 "warnless.h"
+#include "http_proxy.h"
+#include "socks.h"
+#include "vtls/vtls.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
+
+
+void Curl_cf_def_destroy_this(struct Curl_cfilter *cf, struct Curl_easy *data)
+{
+  (void)cf;
+  (void)data;
+}
+
+CURLcode Curl_cf_def_setup(struct Curl_cfilter *cf,
+                           struct Curl_easy *data,
+                           const struct Curl_dns_entry *remotehost)
+{
+  DEBUGASSERT(cf->next);
+  return cf->next->cft->setup(cf->next, data, remotehost);
+}
+
+void     Curl_cf_def_attach_data(struct Curl_cfilter *cf,
+                                 struct Curl_easy *data)
+{
+  (void)cf;
+  (void)data;
+}
+
+void     Curl_cf_def_detach_data(struct Curl_cfilter *cf,
+                                 struct Curl_easy *data)
+{
+  (void)cf;
+  (void)data;
+}
+
+void Curl_cf_def_close(struct Curl_cfilter *cf, struct Curl_easy *data)
+{
+  DEBUGASSERT(cf->next);
+  cf->connected = FALSE;
+  cf->next->cft->close(cf->next, data);
+}
+
+CURLcode Curl_cf_def_connect(struct Curl_cfilter *cf,
+                             struct Curl_easy *data,
+                             bool blocking, bool *done)
+{
+  DEBUGASSERT(cf->next);
+  return cf->next->cft->connect(cf->next, data, blocking, done);
+}
+
+void Curl_cf_def_get_host(struct Curl_cfilter *cf, struct Curl_easy *data,
+                          const char **phost, const char **pdisplay_host,
+                          int *pport)
+{
+  DEBUGASSERT(cf->next);
+  cf->next->cft->get_host(cf->next, data, phost, pdisplay_host, pport);
+}
+
+int Curl_cf_def_get_select_socks(struct Curl_cfilter *cf,
+                                 struct Curl_easy *data,
+                                 curl_socket_t *socks)
+{
+  DEBUGASSERT(cf->next);
+  return cf->next->cft->get_select_socks(cf->next, data, socks);
+}
+
+bool Curl_cf_def_data_pending(struct Curl_cfilter *cf,
+                              const struct Curl_easy *data)
+{
+  DEBUGASSERT(cf->next);
+  return cf->next->cft->has_data_pending(cf->next, data);
+}
+
+ssize_t  Curl_cf_def_send(struct Curl_cfilter *cf, struct Curl_easy *data,
+                          const void *buf, size_t len, CURLcode *err)
+{
+  DEBUGASSERT(cf->next);
+  return cf->next->cft->do_send(cf->next, data, buf, len, err);
+}
+
+ssize_t  Curl_cf_def_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
+                          char *buf, size_t len, CURLcode *err)
+{
+  DEBUGASSERT(cf->next);
+  return cf->next->cft->do_recv(cf->next, data, buf, len, err);
+}
+
+void Curl_conn_cf_discard_all(struct Curl_easy *data,
+                              struct connectdata *conn, int index)
+{
+  struct Curl_cfilter *cfn, *cf = conn->cfilter[index];
+
+  if(cf) {
+    conn->cfilter[index] = NULL;
+    while(cf) {
+      cfn = cf->next;
+      cf->cft->destroy(cf, data);
+      free(cf);
+      cf = cfn;
+    }
+  }
+}
+
+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->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;
+  ssize_t nread;
+
+  DEBUGASSERT(data);
+  DEBUGASSERT(data->conn);
+  cf = data->conn->cfilter[num];
+  while(cf && !cf->connected) {
+    cf = cf->next;
+  }
+  if(cf) {
+    nread = cf->cft->do_recv(cf, data, buf, len, code);
+    /* DEBUGF(infof(data, "Curl_conn_recv(handle=%p, index=%d)"
+           "-> %ld, err=%d", data, num, nread, *code));*/
+    return nread;
+  }
+  failf(data, "no filter connected, conn=%ld, sockindex=%d",
+        data->conn->connection_id, num);
+  *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;
+  ssize_t nwritten;
+
+  DEBUGASSERT(data);
+  DEBUGASSERT(data->conn);
+  cf = data->conn->cfilter[num];
+  while(cf && !cf->connected) {
+    cf = cf->next;
+  }
+  if(cf) {
+    nwritten = cf->cft->do_send(cf, data, mem, len, code);
+    /* DEBUGF(infof(data, "Curl_conn_send(handle=%p, index=%d, len=%ld)"
+           " -> %ld, err=%d", data, num, len, nwritten, *code));*/
+    return nwritten;
+  }
+  failf(data, "no filter connected, conn=%ld, sockindex=%d",
+        data->conn->connection_id, num);
+  *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);
+
+  DEBUGF(infof(data, CMSGI(conn, index, "cf_add(filter=%s)"),
+               cf->cft->name));
+  cf->next = conn->cfilter[index];
+  cf->conn = conn;
+  cf->sockindex = index;
+  conn->cfilter[index] = cf;
+}
+
+void Curl_conn_cf_discard(struct Curl_cfilter *cf, struct Curl_easy *data)
+{
+  struct Curl_cfilter **pprev = &cf->conn->cfilter[cf->sockindex];
+
+  /* remove from chain if still in there */
+  DEBUGASSERT(cf);
+  while (*pprev) {
+    if (*pprev == cf) {
+      *pprev = cf->next;
+      break;
+    }
+    pprev = &((*pprev)->next);
+  }
+  cf->cft->destroy(cf, data);
+  free(cf);
+}
+
+ssize_t Curl_conn_cf_send(struct Curl_cfilter *cf, struct Curl_easy *data,
+                          const void *buf, size_t len, CURLcode *err)
+{
+  return cf->cft->do_send(cf, data, buf, len, err);
+}
+
+ssize_t Curl_conn_cf_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
+                          char *buf, size_t len, CURLcode *err)
+{
+  return cf->cft->do_recv(cf, data, buf, len, err);
+}
+
+CURLcode Curl_conn_setup(struct Curl_easy *data,
+                         struct connectdata *conn,
+                         int sockindex,
+                         const struct Curl_dns_entry *remotehost,
+                         int ssl_mode)
+{
+  struct Curl_cfilter *cf;
+  CURLcode result;
+
+  DEBUGASSERT(data);
+  /* If no filter is set, we have the "default" setup of connection filters.
+   * The filter chain from botton to top will be:
+   * - SOCKET       socket filter for outgoing connection to remotehost
+   * if http_proxy tunneling is engaged:
+   *    - SSL                 if proxytype is CURLPROXY_HTTPS
+   *    - HTTP_PROXY_TUNNEL
+   * otherwise, if socks_proxy is engaged:
+   *    - SOCKS_PROXY_TUNNEL
+   * - SSL          if conn->handler has PROTOPT_SSL
+   */
+  if(!conn->cfilter[sockindex]) {
+    DEBUGF(infof(data, DMSGI(data, sockindex, "setup, init filter chain")));
+    result = Curl_conn_socket_set(data, conn, sockindex);
+    if(result)
+      goto out;
+
+#ifndef CURL_DISABLE_PROXY
+    if(conn->bits.socksproxy) {
+      result = Curl_conn_socks_proxy_add(data, conn, sockindex);
+      if(result)
+        goto out;
+    }
+
+    if(conn->bits.httpproxy) {
+#ifdef USE_SSL
+      if(conn->http_proxy.proxytype == CURLPROXY_HTTPS) {
+        result = Curl_ssl_cfilter_proxy_add(data, conn, sockindex);
+        if(result)
+          goto out;
+      }
+#endif /* USE_SSL */
+
+#if !defined(CURL_DISABLE_HTTP)
+      if(conn->bits.tunnel_proxy) {
+        result = Curl_conn_http_proxy_add(data, conn, sockindex);
+        if(result)
+          goto out;
+      }
+#endif /* !CURL_DISABLE_HTTP */
+    }
+#endif /* !CURL_DISABLE_PROXY */
+
+#ifdef USE_SSL
+    if(ssl_mode == CURL_CF_SSL_ENABLE
+      || (ssl_mode != CURL_CF_SSL_DISABLE
+           && conn->handler->flags & PROTOPT_SSL)) {
+      result = Curl_ssl_cfilter_add(data, conn, sockindex);
+      if(result)
+        goto out;
+    }
+#else
+    (void)ssl_mode;
+#endif /* USE_SSL */
+
+#if !defined(CURL_DISABLE_PROXY) && !defined(CURL_DISABLE_HTTP)
+    if(data->set.haproxyprotocol) {
+      result = Curl_conn_haproxy_add(data, conn, sockindex);
+      if(result)
+        goto out;
+    }
+#endif /* !CURL_DISABLE_PROXY && !CURL_DISABLE_HTTP */
+
+  }
+  DEBUGASSERT(conn->cfilter[sockindex]);
+  cf = data->conn->cfilter[sockindex];
+  result = cf->cft->setup(cf, data, remotehost);
+
+out:
+  return result;
+}
+
+CURLcode Curl_conn_connect(struct Curl_easy *data,
+                           int sockindex,
+                           bool blocking,
+                           bool *done)
+{
+  struct Curl_cfilter *cf;
+  CURLcode result;
+
+  DEBUGASSERT(data);
+
+  cf = data->conn->cfilter[sockindex];
+  DEBUGASSERT(cf);
+  result = cf->cft->connect(cf, data, blocking, done);
+
+  DEBUGF(infof(data, DMSGI(data, sockindex, "connect(block=%d)-> %d, done=%d"),
+         blocking, result, *done));
+  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_is_ssl(struct Curl_easy *data, int sockindex)
+{
+  struct Curl_cfilter *cf = data->conn? data->conn->cfilter[sockindex] : NULL;
+
+  (void)data;
+  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_data_pending(struct Curl_easy *data, int sockindex)
+{
+  struct Curl_cfilter *cf;
+
+  (void)data;
+  DEBUGASSERT(data);
+  DEBUGASSERT(data->conn);
+  if(Curl_recv_has_postponed_data(data->conn, sockindex))
+    return TRUE;
+
+  cf = data->conn->cfilter[sockindex];
+  while(cf && !cf->connected) {
+    cf = cf->next;
+  }
+  if(cf) {
+    return cf->cft->has_data_pending(cf, data);
+  }
+  return FALSE;
+}
+
+int Curl_conn_get_select_socks(struct Curl_easy *data, int sockindex,
+                               curl_socket_t *socks)
+{
+  struct Curl_cfilter *cf;
+
+  DEBUGASSERT(data);
+  DEBUGASSERT(data->conn);
+  cf = data->conn->cfilter[sockindex];
+  if(cf) {
+    return cf->cft->get_select_socks(cf, data, socks);
+  }
+  return GETSOCK_BLANK;
+}
+
+void Curl_conn_attach_data(struct connectdata *conn,
+                           struct Curl_easy *data)
+{
+  size_t i;
+  struct Curl_cfilter *cf;
+
+  for(i = 0; i < ARRAYSIZE(conn->cfilter); ++i) {
+    cf = conn->cfilter[i];
+    if(cf) {
+      while(cf) {
+        cf->cft->attach_data(cf, data);
+        cf = cf->next;
+      }
+    }
+  }
+}
+
+void Curl_conn_detach_data(struct connectdata *conn,
+                           struct Curl_easy *data)
+{
+  size_t i;
+  struct Curl_cfilter *cf;
+
+  for(i = 0; i < ARRAYSIZE(conn->cfilter); ++i) {
+    cf = conn->cfilter[i];
+    if(cf) {
+      while(cf) {
+        cf->cft->detach_data(cf, data);
+        cf = cf->next;
+      }
+    }
+  }
+}
+
+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 connction 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;
+  }
+}
+
+