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nuttx-apps/include/netutils/webclient.h

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/****************************************************************************
* apps/include/netutils/webclient.h
* Header file for the HTTP client
*
* Copyright (C) 2007, 2009, 2011, 2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Based remotely on the uIP webclient which also has a BSD style license:
*
* Author: Adam Dunkels <adam@dunkels.com>
* Copyright (c) 2002, Adam Dunkels.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#ifndef __APPS_INCLUDE_NETUTILS_WEBCLIENT_H
#define __APPS_INCLUDE_NETUTILS_WEBCLIENT_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdbool.h>
#include <sys/types.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef CONFIG_WEBCLIENT_MAXHTTPLINE
# define CONFIG_WEBCLIENT_MAXHTTPLINE 200
#endif
#ifndef CONFIG_WEBCLIENT_MAXMIMESIZE
# define CONFIG_WEBCLIENT_MAXMIMESIZE 32
#endif
#ifndef CONFIG_WEBCLIENT_MAXHOSTNAME
# define CONFIG_WEBCLIENT_MAXHOSTNAME 40
#endif
#ifndef CONFIG_WEBCLIENT_MAXFILENAME
# define CONFIG_WEBCLIENT_MAXFILENAME 100
#endif
#if defined(CONFIG_NETUTILS_CODECS)
# if defined(CONFIG_CODECS_URLCODE)
# define WGET_USE_URLENCODE 1
# endif
#endif
/* The following WEBCLIENT_FLAG_xxx constants are for
* webclient_context::flags.
*/
/* WEBCLIENT_FLAG_NON_BLOCKING tells webclient_perform() to
* use non-blocking I/O.
*
* If this flag is set, webclient_perform() returns -EAGAIN
* when it would otherwise block for network I/O. In that case,
* the application should either retry the operation later by calling
* webclient_perform() again, or abort it by calling webclient_abort().
* It can also use webclient_get_poll_info() to avoid busy-retrying.
*
* If this flag is set, it's the application's responsibility to
* implement a timeout.
*
* If the application specifies tls_ops, it's the application's
* responsibility to make the TLS implementation to use non-blocking I/O
* in addition to specifying this flag.
*
* Caveat: Even when this flag is set, the current implementation performs
* the name resolution in a blocking manner.
*/
#define WEBCLIENT_FLAG_NON_BLOCKING 1U
/* The following WEBCLIENT_FLAG_xxx constants are for
* webclient_poll_info::flags.
*/
#define WEBCLIENT_POLL_INFO_WANT_READ 1U
#define WEBCLIENT_POLL_INFO_WANT_WRITE 2U
/****************************************************************************
* Public types
****************************************************************************/
/* wget calls a user provided function of the following type to process
* each received chuck of the incoming file data. If the system has a file
* system, then it may just write the data to a file. Or it may buffer the
* file in memory. To facilitate this latter case, the caller may modify
* the buffer address in this callback by writing to buffer and buflen. This
* may be used, for example, to implement double buffering.
*
* Input Parameters:
* buffer - A pointer to a pointer to a buffer. If the callee wishes to
* change the buffer address, it may do so in the callback by writing
* to buffer.
* offset - Offset to the beginning of valid data in the buffer. Offset
* is used to skip over any HTTP header info that may be at the
* beginning of the buffer.
* datend - The end+1 offset of valid data in the buffer. The total number
* of valid bytes is datend - offset.
* buflen - A pointer to the length of the buffer. If the callee wishes
* to change the size of the buffer, it may write to buflen.
* arg - User argument passed to callback.
*/
typedef void (*wget_callback_t)(FAR char **buffer, int offset,
int datend, FAR int *buflen, FAR void *arg);
/* webclient_sink_callback_t: callback to consume body data
*
* Same as wget_callback_t, but allowed to fail.
*
* Input Parameters:
* Same as wget_callback_t
*
* Return value:
* 0 on success.
* A negative errno on error.
*/
typedef CODE int (*webclient_sink_callback_t)(FAR char **buffer, int offset,
int datend, FAR int *buflen,
FAR void *arg);
/* webclient_header_callback_t: callback to consume header data
*
* Input Parameters:
* line - A NULL-terminated string containing a header line.
* truncated - Flag for indicating whether the received header line is
* truncated for exceeding the CONFIG_WEBCLIENT_MAXHTTPLINE
* length limit.
* arg - User argument passed to callback.
*/
typedef CODE int (*webclient_header_callback_t)(FAR const char *line,
bool truncated,
FAR void *arg);
/* webclient_body_callback_t: a callback to provide request body
*
* This callback can be called multiple times to provide
* webclient_context::bodylen bytes of the data.
* It's the responsibility of this callback to maintain the current
* "offset" of the data. (similarly to fread(3))
*
* An implementation of this callback should perform either of
* the followings:
*
* - Fill the buffer (specified by buffer and *sizep) with the data
*
* - Update *datap with a buffer filled with the data. In this case,
* it can return more than the amount specified *sizep.
*
* Either ways, it should update *sizep to the size of the data.
*
* A short result is allowed. In that case, this callback will be called
* again to provide the remaining data.
*
* Input Parameters:
* buffer - The buffer to fill.
* sizep - The size of buffer/data in bytes.
* datap - The data to return.
* reqsize - The requested size.
* Note: This can be larger than *sizep.
* The callback can choose either of:
* * return more than *sizep data by updating *datap
* with a large enough buffer
* * or, just return up to *sizep. (For the rest of data,
* the callback will be called again later.)
* ctx - The value of webclient_context::body_callback_arg.
*
* Return value:
* 0 on success.
* A negative errno on error.
*/
typedef CODE int (*webclient_body_callback_t)(
FAR void *buffer,
FAR size_t *sizep,
FAR const void * FAR *datap,
size_t reqsize,
FAR void *ctx);
struct webclient_tls_connection;
struct webclient_poll_info;
struct webclient_tls_ops
{
CODE int (*connect)(FAR void *ctx,
FAR const char *hostname, FAR const char *port,
unsigned int timeout_second,
FAR struct webclient_tls_connection **connp);
CODE ssize_t (*send)(FAR void *ctx,
FAR struct webclient_tls_connection *conn,
FAR const void *buf, size_t len);
CODE ssize_t (*recv)(FAR void *ctx,
FAR struct webclient_tls_connection *conn,
FAR void *buf, size_t len);
CODE int (*close)(FAR void *ctx,
FAR struct webclient_tls_connection *conn);
CODE int (*get_poll_info)(FAR void *ctx,
FAR struct webclient_tls_connection *conn,
FAR struct webclient_poll_info *info);
};
/* Note on webclient_client lifetime
*
* (uninitialized)
* |
* webclient_set_defaults
* |
* v
* INITIALIZED
* |
* | IN-PROGRESS
* | |
* | +-------------+
* | | |
* | | webclient_abort
* | | |
* | | v
* | | ABORTED
* | |
* webclient_perform
* |
* +---------------+
* | |
* | non-blocking mode,
* | returns -EAGAIN
* | |
* v v
* DONE IN-PROGRESS
*
* (uninitialized):
* After the memory for webclient_context is allocated,
* it should be initialized with webclient_set_defaults() before
* feeding it to other functions taking a webclient_context.
*
* webclient_abort() makes the state back to this state.
* If the application wants to reuse the context for another request,
* it should initialize it with webclient_set_defaults() again.
*
* INITIALIZED:
* After calling webclient_set_defaults(), the application can set up
* the request parameters by setting the struct fields before the first
* call of webclient_perform().
* E.g. url, method, buffers, and callbacks.
*
* webclient_set_static_body() can only be used in this state.
*
* IN-PROGRESS:
* This state only exists for the non-blocking mode.
*
* webclient_get_poll_info() can only be used in this state.
*
* ABORTED:
* The HTTP operation has been aborted by webclient_abort().
*
* DONE:
* The HTTP operation has been completed. (Either successfully or not.)
*
* The application can examine the struct fields to see the result.
* E.g. http_status and http_reason.
*
* ABORTED, DONE:
* The application can now dispose the resources associated to the
* context.
* E.g. buffers
*
* If the application wants to reuse the context for another request,
* it should initialize it with webclient_set_defaults() again.
*/
struct webclient_context
{
/* request parameters
*
* method - HTTP method like "GET", "POST".
* The default value is "GET".
* url - A pointer to a string containing the full URL.
* (e.g., http://www.nutt.org/index.html, or
* http://192.168.23.1:80/index.html)
* unix_socket_path - If not NULL, the path to an AF_LOCAL socket.
* headers - An array of pointers to the extra headers.
* nheaders - The number of elements in the "headers" array.
* bodylen - The size of the request body.
* timeout_sec - The timeout in second.
* This is not meant to cover the entire transaction.
* Instead, this is meant to be an inactive timer.
* That is, if no progress is made during the
* specified amount of time, the operation will fail.
* The default is CONFIG_WEBCLIENT_TIMEOUT, which is
* 10 seconds by default.
*/
FAR const char *method;
FAR const char *url;
#if defined(CONFIG_WEBCLIENT_NET_LOCAL)
FAR const char *unix_socket_path;
#endif
FAR const char * FAR const *headers;
unsigned int nheaders;
size_t bodylen;
unsigned int timeout_sec;
/* other parameters
*
* buffer - A user provided buffer to receive the file data
* (also used for the outgoing GET request)
* It should be large enough to hold the whole
* request header. It should also be large enough
* to hold the whole response header.
* buflen - The size of the user provided buffer
* sink_callback - As data is obtained from the host, this function
* is to dispose of each block of file data as it is
* received.
* callback - a compat version of sink_callback.
* sink_callback_arg - User argument passed to callback.
* body_callback - A callback function to provide the request body.
* body_callback_arg - User argument passed to body_callback.
* tls_ops - A vector to implement TLS operations.
* NULL means no https support.
* tls_ctx - A user pointer to be passed to tls_ops as it is.
* flags - OR'ed WEBCLIENT_FLAG_xxx values.
*/
FAR char *buffer;
int buflen;
wget_callback_t callback;
webclient_sink_callback_t sink_callback;
FAR void *sink_callback_arg;
webclient_header_callback_t header_callback;
FAR void *header_callback_arg;
webclient_body_callback_t body_callback;
FAR void *body_callback_arg;
FAR const struct webclient_tls_ops *tls_ops;
FAR void *tls_ctx;
unsigned int flags;
/* results
*
* http_status - HTTP status code
* http_reason - A buffer to store HTTP reason phrase.
* If NULL, the reason phrase will be discarded.
* http_reason_len - The size of the http_reason buffer
* A reason phrase longer than the buffer size
* will be silently truncated.
*/
unsigned int http_status;
FAR char *http_reason;
size_t http_reason_len;
struct wget_s *ws;
#ifdef CONFIG_DEBUG_ASSERTIONS
enum webclient_context_state_e
{
WEBCLIENT_CONTEXT_STATE_UNINITIALIZED,
WEBCLIENT_CONTEXT_STATE_INITIALIZED,
WEBCLIENT_CONTEXT_STATE_IN_PROGRESS,
WEBCLIENT_CONTEXT_STATE_ABORTED,
WEBCLIENT_CONTEXT_STATE_DONE,
} state;
#endif
};
struct webclient_poll_info
{
/* A file descriptor to wait for i/o. */
int fd;
unsigned int flags; /* OR'ed WEBCLIENT_POLL_INFO_xxx flags */
};
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
#ifdef WGET_USE_URLENCODE
FAR char *web_post_str(FAR char *buffer, FAR int *size, FAR char *name,
FAR char *value);
FAR char *web_posts_str(FAR char *buffer, FAR int *size, FAR char **name,
FAR char **value, int len);
int web_post_strlen(FAR char *name, FAR char *value);
int web_posts_strlen(FAR char **name, FAR char **value, int len);
#endif
/****************************************************************************
* Name: wget
*
* Description:
* Obtain the requested file from an HTTP server using the GET method.
*
* Input Parameters
* url - A pointer to a string containing either the full URL to
* the file to get (e.g., http://www.nutt.org/index.html, or
* http://192.168.23.1:80/index.html).
* buffer - A user provided buffer to receive the file data (also
* used for the outgoing GET request
* buflen - The size of the user provided buffer
* callback - As data is obtained from the host, this function is
* to dispose of each block of file data as it is received.
* arg - User argument passed to callback.
*
* Returned Value:
* 0: if the GET operation completed successfully;
* -1: On a failure with errno set appropriately
*
****************************************************************************/
int wget(FAR const char *url, FAR char *buffer, int buflen,
wget_callback_t callback, FAR void *arg);
int wget_post(FAR const char *url, FAR const char *posts, FAR char *buffer,
int buflen, wget_callback_t callback, FAR void *arg);
void webclient_set_defaults(FAR struct webclient_context *ctx);
int webclient_perform(FAR struct webclient_context *ctx);
void webclient_abort(FAR struct webclient_context *ctx);
void webclient_set_static_body(FAR struct webclient_context *ctx,
FAR const void *body,
size_t bodylen);
int webclient_get_poll_info(FAR struct webclient_context *ctx,
FAR struct webclient_poll_info *info);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __APPS_INCLUDE_NETUTILS_WEBCLIENT_H */
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