464 строки
12 KiB
C
464 строки
12 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id$
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***************************************************************************/
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#include "setup.h"
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <errno.h>
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h> /* required for send() & recv() prototypes */
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <curl/curl.h>
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#include "urldata.h"
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#include "sendf.h"
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#include "connect.h" /* for the Curl_ourerrno() proto */
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#define _MPRINTF_REPLACE /* use the internal *printf() functions */
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#include <curl/mprintf.h>
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#ifdef HAVE_KRB4
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#include "security.h"
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#endif
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#include <string.h>
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/* The last #include file should be: */
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#ifdef CURLDEBUG
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#include "memdebug.h"
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#endif
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/* returns last node in linked list */
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static struct curl_slist *slist_get_last(struct curl_slist *list)
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{
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struct curl_slist *item;
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/* if caller passed us a NULL, return now */
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if (!list)
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return NULL;
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/* loop through to find the last item */
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item = list;
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while (item->next) {
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item = item->next;
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}
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return item;
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}
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/* append a struct to the linked list. It always retunrs the address of the
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* first record, so that you can sure this function as an initialization
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* function as well as an append function. If you find this bothersome,
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* then simply create a separate _init function and call it appropriately from
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* within the proram. */
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struct curl_slist *curl_slist_append(struct curl_slist *list,
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const char *data)
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{
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struct curl_slist *last;
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struct curl_slist *new_item;
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new_item = (struct curl_slist *) malloc(sizeof(struct curl_slist));
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if (new_item) {
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new_item->next = NULL;
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new_item->data = strdup(data);
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}
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if (new_item == NULL || new_item->data == NULL) {
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return NULL;
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}
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if (list) {
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last = slist_get_last(list);
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last->next = new_item;
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return list;
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}
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/* if this is the first item, then new_item *is* the list */
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return new_item;
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}
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/* be nice and clean up resources */
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void curl_slist_free_all(struct curl_slist *list)
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{
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struct curl_slist *next;
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struct curl_slist *item;
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if (!list)
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return;
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item = list;
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do {
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next = item->next;
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if (item->data) {
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free(item->data);
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}
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free(item);
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item = next;
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} while (next);
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}
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/* Curl_infof() is for info message along the way */
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void Curl_infof(struct SessionHandle *data, const char *fmt, ...)
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{
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if(data && data->set.verbose) {
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va_list ap;
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char print_buffer[1024 + 1];
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va_start(ap, fmt);
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vsnprintf(print_buffer, 1024, fmt, ap);
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va_end(ap);
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Curl_debug(data, CURLINFO_TEXT, print_buffer, strlen(print_buffer));
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}
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}
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/* Curl_failf() is for messages stating why we failed.
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* The message SHALL NOT include any LF or CR.
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*/
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void Curl_failf(struct SessionHandle *data, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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if(data->set.errorbuffer && !data->state.errorbuf) {
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vsnprintf(data->set.errorbuffer, CURL_ERROR_SIZE, fmt, ap);
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data->state.errorbuf = TRUE; /* wrote error string */
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if(data->set.verbose) {
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int len = strlen(data->set.errorbuffer);
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bool doneit=FALSE;
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if(len < CURL_ERROR_SIZE - 1) {
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doneit = TRUE;
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data->set.errorbuffer[len] = '\n';
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data->set.errorbuffer[++len] = '\0';
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}
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Curl_debug(data, CURLINFO_TEXT, data->set.errorbuffer, len);
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if(doneit)
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/* cut off the newline again */
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data->set.errorbuffer[--len]=0;
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}
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}
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va_end(ap);
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}
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/* Curl_sendf() sends formated data to the server */
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CURLcode Curl_sendf(int sockfd, struct connectdata *conn,
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const char *fmt, ...)
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{
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struct SessionHandle *data = conn->data;
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ssize_t bytes_written;
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ssize_t write_len;
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CURLcode res;
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char *s;
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char *sptr;
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va_list ap;
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va_start(ap, fmt);
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s = vaprintf(fmt, ap); /* returns an allocated string */
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va_end(ap);
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if(!s)
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return CURLE_OUT_OF_MEMORY; /* failure */
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bytes_written=0;
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write_len = strlen(s);
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sptr = s;
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while (1) {
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/* Write the buffer to the socket */
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res = Curl_write(conn, sockfd, sptr, write_len, &bytes_written);
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if(CURLE_OK != res)
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break;
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if(data->set.verbose)
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Curl_debug(data, CURLINFO_DATA_OUT, sptr, bytes_written);
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if(bytes_written != write_len) {
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/* if not all was written at once, we must advance the pointer, decrease
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the size left and try again! */
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write_len -= bytes_written;
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sptr += bytes_written;
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}
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else
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break;
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}
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free(s); /* free the output string */
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return res;
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}
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/*
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* Curl_write() is an internal write function that sends plain (binary) data
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* to the server. Works with plain sockets, SSL or kerberos.
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*
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*/
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CURLcode Curl_write(struct connectdata *conn,
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int sockfd,
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void *mem, size_t len,
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ssize_t *written)
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{
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ssize_t bytes_written;
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CURLcode retcode;
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#ifdef USE_SSLEAY
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/* Set 'num' to 0 or 1, depending on which socket that has been sent here.
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If it is the second socket, we set num to 1. Otherwise to 0. This lets
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us use the correct ssl handle. */
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int num = (sockfd == conn->sock[SECONDARYSOCKET]);
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/* SSL_write() is said to return 'int' while write() and send() returns
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'size_t' */
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if (conn->ssl[num].use) {
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int err;
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int rc = SSL_write(conn->ssl[num].handle, mem, len);
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if(rc < 0) {
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err = SSL_get_error(conn->ssl[num].handle, rc);
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switch(err) {
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case SSL_ERROR_WANT_READ:
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case SSL_ERROR_WANT_WRITE:
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/* The operation did not complete; the same TLS/SSL I/O function
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should be called again later. This is basicly an EWOULDBLOCK
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equivalent. */
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*written = 0;
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return CURLE_OK;
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case SSL_ERROR_SYSCALL:
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failf(conn->data, "SSL_write() returned SYSCALL, errno = %d\n",
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Curl_ourerrno());
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return CURLE_SEND_ERROR;
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case SSL_ERROR_SSL:
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{
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/* A failure in the SSL library occurred, usually a
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protocol error. The OpenSSL error queue contains more
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information on the error. */
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char error_buffer[120]; /* OpenSSL documents that this must be at least
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120 bytes long. */
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int sslerror = ERR_get_error();
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failf(conn->data, "SSL_write() error: %s\n",
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ERR_error_string(sslerror, error_buffer));
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return CURLE_SEND_ERROR;
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}
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break;
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}
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/* a true error */
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failf(conn->data, "SSL_write() return error %d\n", err);
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return CURLE_SEND_ERROR;
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}
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bytes_written = rc;
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}
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else {
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#else
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(void)conn;
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#endif
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#ifdef HAVE_KRB4
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if(conn->sec_complete) {
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bytes_written = Curl_sec_write(conn, sockfd, mem, len);
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}
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else
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#endif /* HAVE_KRB4 */
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{
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bytes_written = swrite(sockfd, mem, len);
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}
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if(-1 == bytes_written) {
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int err = Curl_ourerrno();
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if(
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#ifdef WSAEWOULDBLOCK
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/* This is how Windows does it */
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(WSAEWOULDBLOCK == err)
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#else
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/* As pointed out by Christophe Demory on March 11 2003, errno
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may be EWOULDBLOCK or on some systems EAGAIN when it returned
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due to its inability to send off data without blocking. We
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therefor treat both error codes the same here */
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(EWOULDBLOCK == err) || (EAGAIN == err) || (EINTR == err)
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#endif
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)
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/* this is just a case of EWOULDBLOCK */
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bytes_written=0;
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}
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#ifdef USE_SSLEAY
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}
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#endif
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*written = bytes_written;
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retcode = (-1 != bytes_written)?CURLE_OK:CURLE_SEND_ERROR;
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return retcode;
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}
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/* client_write() sends data to the write callback(s)
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The bit pattern defines to what "streams" to write to. Body and/or header.
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The defines are in sendf.h of course.
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*/
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CURLcode Curl_client_write(struct SessionHandle *data,
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int type,
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char *ptr,
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size_t len)
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{
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size_t wrote;
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if(0 == len)
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len = strlen(ptr);
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if(type & CLIENTWRITE_BODY) {
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wrote = data->set.fwrite(ptr, 1, len, data->set.out);
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if(wrote != len) {
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failf (data, "Failed writing body");
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return CURLE_WRITE_ERROR;
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}
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}
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if((type & CLIENTWRITE_HEADER) &&
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(data->set.fwrite_header || data->set.writeheader) ) {
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/*
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* Write headers to the same callback or to the especially setup
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* header callback function (added after version 7.7.1).
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*/
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curl_write_callback writeit=
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data->set.fwrite_header?data->set.fwrite_header:data->set.fwrite;
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wrote = writeit(ptr, 1, len, data->set.writeheader);
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if(wrote != len) {
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failf (data, "Failed writing header");
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return CURLE_WRITE_ERROR;
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}
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}
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return CURLE_OK;
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}
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/*
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* Internal read-from-socket function. This is meant to deal with plain
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* sockets, SSL sockets and kerberos sockets.
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*
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* If the read would block (EWOULDBLOCK) we return -1. Otherwise we return
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* a regular CURLcode value.
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*/
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int Curl_read(struct connectdata *conn,
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int sockfd,
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char *buf,
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size_t buffersize,
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ssize_t *n)
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{
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ssize_t nread;
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#ifdef USE_SSLEAY
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/* Set 'num' to 0 or 1, depending on which socket that has been sent here.
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If it is the second socket, we set num to 1. Otherwise to 0. This lets
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us use the correct ssl handle. */
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int num = (sockfd == conn->sock[SECONDARYSOCKET]);
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*n=0; /* reset amount to zero */
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if (conn->ssl[num].use) {
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nread = SSL_read(conn->ssl[num].handle, buf, buffersize);
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if(nread < 0) {
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/* failed SSL_read */
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int err = SSL_get_error(conn->ssl[num].handle, nread);
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switch(err) {
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case SSL_ERROR_NONE: /* this is not an error */
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case SSL_ERROR_ZERO_RETURN: /* no more data */
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break;
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case SSL_ERROR_WANT_READ:
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case SSL_ERROR_WANT_WRITE:
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/* there's data pending, re-invoke SSL_read() */
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return -1; /* basicly EWOULDBLOCK */
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default:
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/* openssl/ssl.h says "look at error stack/return value/errno" */
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{
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char error_buffer[120]; /* OpenSSL documents that this must be at
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least 120 bytes long. */
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int sslerror = ERR_get_error();
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failf(conn->data, "SSL read: %s, errno %d",
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ERR_error_string(sslerror, error_buffer),
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Curl_ourerrno() );
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}
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return CURLE_RECV_ERROR;
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}
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}
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}
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else {
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#else
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(void)conn;
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#endif
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*n=0; /* reset amount to zero */
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#ifdef HAVE_KRB4
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if(conn->sec_complete)
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nread = Curl_sec_read(conn, sockfd, buf, buffersize);
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else
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#endif
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nread = sread(sockfd, buf, buffersize);
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if(-1 == nread) {
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int err = Curl_ourerrno();
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conn->sockerror = err;
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#ifdef WIN32
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if(WSAEWOULDBLOCK == err)
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#else
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if((EWOULDBLOCK == err) || (EAGAIN == err) || (EINTR == err))
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#endif
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return -1;
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}
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else
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conn->sockerror = 0; /* no error */
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#ifdef USE_SSLEAY
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}
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#endif /* USE_SSLEAY */
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*n = nread;
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return CURLE_OK;
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}
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/* return 0 on success */
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int Curl_debug(struct SessionHandle *data, curl_infotype type,
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char *ptr, size_t size)
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{
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static const char * const s_infotype[CURLINFO_END] = {
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"* ", "< ", "> ", "{ ", "} " };
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if(data->set.fdebug)
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return (*data->set.fdebug)(data, type, ptr, size,
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data->set.debugdata);
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switch(type) {
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case CURLINFO_TEXT:
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case CURLINFO_HEADER_OUT:
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case CURLINFO_HEADER_IN:
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fwrite(s_infotype[type], 2, 1, data->set.err);
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fwrite(ptr, size, 1, data->set.err);
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break;
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default: /* nada */
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break;
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}
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return 0;
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}
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