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df01507582
curl/lib/sendf.c
Daniel Stenberg df01507582 Curl_read() and Curl_write() are both now adjusted to return properly in 
cases where EWOULDBLOCK or equivalent is returned. We must not block.
2002-01-16 14:49:08 +00:00

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/*****************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2000, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* In order to be useful for every potential user, curl and libcurl are
* dual-licensed under the MPL and the MIT/X-derivate licenses.
*
* 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 MPL or the MIT/X-derivate
* licenses. You may pick one of these licenses.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
*****************************************************************************/
#include "setup.h"
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h> /* required for send() & recv() prototypes */
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
#include <winsock.h>
#endif
#include <curl/curl.h>
#include "urldata.h"
#include "sendf.h"
#define _MPRINTF_REPLACE /* use the internal *printf() functions */
#include <curl/mprintf.h>
#ifdef KRB4
#include "security.h"
#endif
#include <string.h>
/* The last #include file should be: */
#ifdef MALLOCDEBUG
#include "memdebug.h"
#endif
/* returns last node in linked list */
static struct curl_slist *slist_get_last(struct curl_slist *list)
{
struct curl_slist *item;
/* if caller passed us a NULL, return now */
if (!list)
return NULL;
/* loop through to find the last item */
item = list;
while (item->next) {
item = item->next;
}
return item;
}
/* append a struct to the linked list. It always retunrs the address of the
* first record, so that you can sure this function as an initialization
* function as well as an append function. If you find this bothersome,
* then simply create a separate _init function and call it appropriately from
* within the proram. */
struct curl_slist *curl_slist_append(struct curl_slist *list,
const char *data)
{
struct curl_slist *last;
struct curl_slist *new_item;
new_item = (struct curl_slist *) malloc(sizeof(struct curl_slist));
if (new_item) {
new_item->next = NULL;
new_item->data = strdup(data);
}
else {
fprintf(stderr, "Cannot allocate memory for QUOTE list.\n");
return NULL;
}
if (list) {
last = slist_get_last(list);
last->next = new_item;
return list;
}
/* if this is the first item, then new_item *is* the list */
return new_item;
}
/* be nice and clean up resources */
void curl_slist_free_all(struct curl_slist *list)
{
struct curl_slist *next;
struct curl_slist *item;
if (!list)
return;
item = list;
do {
next = item->next;
if (item->data) {
free(item->data);
}
free(item);
item = next;
} while (next);
}
/* Curl_infof() is for info message along the way */
void Curl_infof(struct SessionHandle *data, const char *fmt, ...)
{
va_list ap;
if(data->set.verbose) {
va_start(ap, fmt);
fputs("* ", data->set.err);
vfprintf(data->set.err, fmt, ap);
va_end(ap);
}
}
/* Curl_failf() is for messages stating why we failed.
* The message SHALL NOT include any LF or CR.
*/
void Curl_failf(struct SessionHandle *data, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if(data->set.errorbuffer && !data->state.errorbuf) {
vsnprintf(data->set.errorbuffer, CURL_ERROR_SIZE, fmt, ap);
data->state.errorbuf = TRUE; /* wrote error string */
}
va_end(ap);
}
/* Curl_sendf() sends formated data to the server */
CURLcode Curl_sendf(int sockfd, struct connectdata *conn,
const char *fmt, ...)
{
struct SessionHandle *data = conn->data;
ssize_t bytes_written;
CURLcode result;
char *s;
va_list ap;
va_start(ap, fmt);
s = vaprintf(fmt, ap); /* returns an allocated string */
va_end(ap);
if(!s)
return 0; /* failure */
if(data->set.verbose)
fprintf(data->set.err, "> %s", s);
/* Write the buffer to the socket */
result = Curl_write(conn, sockfd, s, strlen(s), &bytes_written);
free(s); /* free the output string */
return result;
}
/*
* Curl_write() is an internal write function that sends plain (binary) data
* to the server. Works with plain sockets, SSL or kerberos.
*
*/
CURLcode Curl_write(struct connectdata *conn, int sockfd,
void *mem, size_t len,
ssize_t *written)
{
ssize_t bytes_written;
#ifdef USE_SSLEAY
/* SSL_write() is said to return 'int' while write() and send() returns
'size_t' */
if (conn->ssl.use) {
int err;
int rc = SSL_write(conn->ssl.handle, mem, len);
if(rc < 0) {
err = SSL_get_error(conn->ssl.handle, rc);
switch(err) {
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
/* this is basicly the EWOULDBLOCK equivalent */
*written = 0;
return CURLE_OK;
}
/* a true error */
failf(conn->data, "SSL_write() return error %d\n", err);
return CURLE_WRITE_ERROR;
}
}
else {
#endif
#ifdef KRB4
if(conn->sec_complete) {
bytes_written = Curl_sec_write(conn, sockfd, mem, len);
}
else
#endif /* KRB4 */
{
bytes_written = swrite(sockfd, mem, len);
}
if(-1 == bytes_written) {
#ifdef WIN32
if(EWOULDBLOCK == GetLastError())
#else
if(EWOULDBLOCK == errno)
#endif
{
/* this is just a case of EWOULDBLOCK */
*written=0;
return CURLE_OK;
}
}
#ifdef USE_SSLEAY
}
#endif
*written = bytes_written;
return (-1 != bytes_written)?CURLE_OK:CURLE_WRITE_ERROR;
}
/* client_write() sends data to the write callback(s)
The bit pattern defines to what "streams" to write to. Body and/or header.
The defines are in sendf.h of course.
*/
CURLcode Curl_client_write(struct SessionHandle *data,
int type,
char *ptr,
size_t len)
{
size_t wrote;
if(0 == len)
len = strlen(ptr);
if(type & CLIENTWRITE_BODY) {
wrote = data->set.fwrite(ptr, 1, len, data->set.out);
if(wrote != len) {
failf (data, "Failed writing body");
return CURLE_WRITE_ERROR;
}
}
if((type & CLIENTWRITE_HEADER) &&
(data->set.fwrite_header || data->set.writeheader) ) {
/*
* Write headers to the same callback or to the especially setup
* header callback function (added after version 7.7.1).
*/
curl_write_callback writeit=
data->set.fwrite_header?data->set.fwrite_header:data->set.fwrite;
wrote = writeit(ptr, 1, len, data->set.writeheader);
if(wrote != len) {
failf (data, "Failed writing header");
return CURLE_WRITE_ERROR;
}
}
return CURLE_OK;
}
/*
* Internal read-from-socket function. This is meant to deal with plain
* sockets, SSL sockets and kerberos sockets.
*
* If the read would block (EWOULDBLOCK) we return -1. Otherwise we return
* a regular CURLcode value.
*/
int Curl_read(struct connectdata *conn,
int sockfd,
char *buf,
size_t buffersize,
ssize_t *n)
{
ssize_t nread;
#ifdef USE_SSLEAY
if (conn->ssl.use) {
bool loop=TRUE;
int err;
do {
nread = SSL_read(conn->ssl.handle, buf, buffersize);
if(nread > 0)
/* successful read */
break;
err = SSL_get_error(conn->ssl.handle, nread);
switch(err) {
case SSL_ERROR_NONE: /* this is not an error */
case SSL_ERROR_ZERO_RETURN: /* no more data */
loop=0; /* get out of loop */
break;
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
/* if there's data pending, then we re-invoke SSL_read() */
break;
}
} while(0);
if(loop && SSL_pending(conn->ssl.handle))
return -1; /* basicly EWOULDBLOCK */
}
else {
#endif
#ifdef KRB4
if(conn->sec_complete)
nread = Curl_sec_read(conn, sockfd, buf, buffersize);
else
#endif
nread = sread (sockfd, buf, buffersize);
if(-1 == nread) {
#ifdef WIN32
if(EWOULDBLOCK == GetLastError())
#else
if(EWOULDBLOCK == errno)
#endif
return -1;
}
#ifdef USE_SSLEAY
}
#endif /* USE_SSLEAY */
*n = nread;
return CURLE_OK;
}
/*
* local variables:
* eval: (load-file "../curl-mode.el")
* end:
* vim600: fdm=marker
* vim: et sw=2 ts=2 sts=2 tw=78
*/
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