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nuttx-apps/netutils/webclient/webclient.c
YAMAMOTO Takashi ebe3b0d302 webclient: Report unexpected connection loss as an explicit error 
Otherwise, it can end up with mysterious results in user apps.
2021-01-13 20:51:06 -06:00

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/****************************************************************************
* netutils/webclient/webclient.c
* Implementation of the HTTP client.
*
* Copyright (C) 2007, 2009, 2011-2012, 2014, 2020 Gregory Nutt.
* All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Based on uIP 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.
*
****************************************************************************/
/* This example shows a HTTP client that is able to download web pages
* and files from web servers. It requires a number of callback
* functions to be implemented by the module that utilizes the code:
* webclient_datahandler().
*/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <debug.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <stdint.h>
#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <netdb.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <errno.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <nuttx/version.h>
#include "netutils/netlib.h"
#include "netutils/webclient.h"
#if defined(CONFIG_NETUTILS_CODECS)
# if defined(CONFIG_CODECS_URLCODE)
# include "netutils/urldecode.h"
# endif
# if defined(CONFIG_CODECS_BASE64)
# include "netutils/base64.h"
# endif
#else
# undef CONFIG_CODECS_URLCODE
# undef CONFIG_CODECS_BASE64
#endif
#ifndef CONFIG_NSH_WGET_USERAGENT
# if CONFIG_VERSION_MAJOR != 0 || CONFIG_VERSION_MINOR != 0
# define CONFIG_NSH_WGET_USERAGENT \
"NuttX/" CONFIG_VERSION_STRING " (; http://www.nuttx.org/)"
# else
# define CONFIG_NSH_WGET_USERAGENT \
"NuttX/6.xx.x (; http://www.nuttx.org/)"
# endif
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef CONFIG_WEBCLIENT_TIMEOUT
# define CONFIG_WEBCLIENT_TIMEOUT 10
#endif
#ifndef CONFIG_WEBCLIENT_MAX_REDIRECT
/* The default value 50 is taken from curl's --max-redirs option. */
# define CONFIG_WEBCLIENT_MAX_REDIRECT 50
#endif
#define WEBCLIENT_STATE_STATUSLINE 0
#define WEBCLIENT_STATE_HEADERS 1
#define WEBCLIENT_STATE_DATA 2
#define WEBCLIENT_STATE_CLOSE 3
#define HTTPSTATUS_NONE 0
#define HTTPSTATUS_OK 1
#define HTTPSTATUS_MOVED 2
#define HTTPSTATUS_ERROR 3
#define ISO_NL 0x0a
#define ISO_CR 0x0d
#define ISO_SPACE 0x20
#define WGET_MODE_GET 0
#define WGET_MODE_POST 1
/****************************************************************************
* Private Types
****************************************************************************/
struct wget_s
{
/* Internal status */
uint8_t state;
uint8_t httpstatus;
uint16_t port; /* The port number to use in the connection */
/* These describe the just-received buffer of data */
FAR char *buffer; /* user-provided buffer */
int buflen; /* Length of the user provided buffer */
int offset; /* Offset to the beginning of interesting data */
int datend; /* Offset+1 to the last valid byte of data in the buffer */
/* Buffer HTTP header data and parse line at a time */
char line[CONFIG_WEBCLIENT_MAXHTTPLINE];
int ndx;
#ifdef CONFIG_WEBCLIENT_GETMIMETYPE
char mimetype[CONFIG_WEBCLIENT_MAXMIMESIZE];
#endif
char scheme[sizeof("https") + 1];
char hostname[CONFIG_WEBCLIENT_MAXHOSTNAME];
char filename[CONFIG_WEBCLIENT_MAXFILENAME];
};
struct conn
{
bool tls;
int sockfd;
struct webclient_tls_connection *tls_conn;
};
/****************************************************************************
* Private Data
****************************************************************************/
static const char g_http10[] = "HTTP/1.0";
static const char g_http11[] = "HTTP/1.1";
#ifdef CONFIG_WEBCLIENT_GETMIMETYPE
static const char g_httpcontenttype[] = "content-type: ";
#endif
static const char g_httphost[] = "host: ";
static const char g_httplocation[] = "location: ";
static const char g_httpuseragentfields[] =
"Connection: close\r\n"
"User-Agent: "
CONFIG_NSH_WGET_USERAGENT
"\r\n\r\n";
static const char g_httpcrnl[] = "\r\n";
static const char g_httpform[] = "Content-Type: "
"application/x-www-form-urlencoded";
static const char g_httpcontsize[] = "Content-Length: ";
#if 0
static const char g_httpconn[] = "Connection: Keep-Alive";
static const char g_httpcache[] = "Cache-Control: no-cache";
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: conn_send
****************************************************************************/
static ssize_t conn_send(struct webclient_context *ctx, struct conn *conn,
const void *buffer, size_t len)
{
if (conn->tls)
{
return ctx->tls_ops->send(ctx->tls_ctx, conn->tls_conn, buffer, len);
}
else
{
ssize_t ret = send(conn->sockfd, buffer, len, 0);
if (ret == -1)
{
return -errno;
}
return ret;
}
}
/****************************************************************************
* Name: conn_send_all
****************************************************************************/
static int conn_send_all(struct webclient_context *ctx, struct conn *conn,
const void *buffer, size_t len)
{
size_t left = len;
ssize_t ret;
while (left > 0)
{
ret = conn_send(ctx, conn, buffer, left);
if (ret < 0)
{
goto errout;
}
buffer += ret;
left -= ret;
}
return len;
errout:
return ret;
}
/****************************************************************************
* Name: conn_recv
****************************************************************************/
static ssize_t conn_recv(struct webclient_context *ctx, struct conn *conn,
void *buffer, size_t len)
{
if (conn->tls)
{
return ctx->tls_ops->recv(ctx->tls_ctx, conn->tls_conn, buffer, len);
}
else
{
ssize_t ret = recv(conn->sockfd, buffer, len, 0);
if (ret == -1)
{
return -errno;
}
return ret;
}
}
/****************************************************************************
* Name: conn_close
****************************************************************************/
static void conn_close(struct webclient_context *ctx, struct conn *conn)
{
if (conn->tls)
{
ctx->tls_ops->close(ctx->tls_ctx, conn->tls_conn);
}
else
{
close(conn->sockfd);
}
}
/****************************************************************************
* Name: webclient_static_body_func
****************************************************************************/
static int webclient_static_body_func(FAR void *buffer,
FAR size_t *sizep,
FAR const void * FAR *datap,
size_t reqsize,
FAR void *ctx)
{
*datap = ctx;
*sizep = reqsize;
return 0;
}
/****************************************************************************
* Name: append
****************************************************************************/
static char *append(char *dest, char *ep, const char *src)
{
int len;
if (dest == NULL)
{
return NULL;
}
len = strlen(src);
if (ep - dest < len + 1)
{
return NULL;
}
memcpy(dest, src, len);
dest[len] = '\0';
return dest + len;
}
/****************************************************************************
* Name: wget_strcpy
****************************************************************************/
#ifdef WGET_USE_URLENCODE
static char *wget_strcpy(char *dest, const char *src)
{
int len = strlen(src);
memcpy(dest, src, len);
dest[len] = '\0';
return dest + len;
}
#endif
/****************************************************************************
* Name: wget_urlencode_strcpy
****************************************************************************/
#ifdef WGET_USE_URLENCODE
static char *wget_urlencode_strcpy(char *dest, const char *src)
{
int len = strlen(src);
int d_len;
d_len = urlencode_len(src, len);
urlencode(src, len, dest, &d_len);
return dest + d_len;
}
#endif
/****************************************************************************
* Name: wget_parsestatus
****************************************************************************/
static inline int wget_parsestatus(struct webclient_context *ctx,
struct wget_s *ws)
{
int offset;
int ndx;
char *dest;
offset = ws->offset;
ndx = ws->ndx;
while (offset < ws->datend)
{
ws->line[ndx] = ws->buffer[offset];
if (ws->line[ndx] == ISO_NL)
{
ws->line[ndx] = '\0';
if ((strncmp(ws->line, g_http10, strlen(g_http10)) == 0) ||
(strncmp(ws->line, g_http11, strlen(g_http11)) == 0))
{
unsigned long http_status;
char *ep;
dest = &(ws->line[9]);
ws->httpstatus = HTTPSTATUS_NONE;
errno = 0;
http_status = strtoul(dest, &ep, 10);
if (ep == dest)
{
return -EINVAL;
}
if (*ep != ' ')
{
return -EINVAL;
}
if (errno != 0)
{
return -errno;
}
ctx->http_status = http_status;
if (ctx->http_reason != NULL)
{
strncpy(ctx->http_reason,
ep + 1,
ctx->http_reason_len - 1);
ctx->http_reason[ctx->http_reason_len - 1] = 0;
}
/* Check for 2xx (Successful) */
if ((http_status / 100) == 2)
{
ws->httpstatus = HTTPSTATUS_OK;
}
/* Check for 3xx (Redirection)
* Location: header line will contain the new location.
*/
else if ((http_status / 100) == 3)
{
ws->httpstatus = HTTPSTATUS_MOVED;
}
}
else
{
return - ECONNABORTED;
}
/* We're done parsing the status line, so start parsing
* the HTTP headers.
*/
ws->state = WEBCLIENT_STATE_HEADERS;
break;
}
else
{
offset++;
ndx++;
}
}
ws->offset = offset;
ws->ndx = ndx;
return OK;
}
/****************************************************************************
* Name: parseurl
****************************************************************************/
static int parseurl(FAR const char *url, FAR struct wget_s *ws)
{
struct url_s url_s;
int ret;
memset(&url_s, 0, sizeof(url_s));
url_s.scheme = ws->scheme;
url_s.schemelen = sizeof(ws->scheme);
url_s.host = ws->hostname;
url_s.hostlen = sizeof(ws->hostname);
url_s.path = ws->filename;
url_s.pathlen = sizeof(ws->filename);
ret = netlib_parseurl(url, &url_s);
if (ret < 0)
{
return ret;
}
if (url_s.port == 0)
{
if (!strcmp(ws->scheme, "https"))
{
ws->port = 443;
}
else
{
ws->port = 80;
}
}
else
{
ws->port = url_s.port;
}
return 0;
}
/****************************************************************************
* Name: wget_parseheaders
****************************************************************************/
static inline int wget_parseheaders(struct wget_s *ws)
{
int offset;
int ndx;
int ret = OK;
offset = ws->offset;
ndx = ws->ndx;
while (offset < ws->datend)
{
ws->line[ndx] = ws->buffer[offset];
if (ws->line[ndx] == ISO_NL)
{
/* We have an entire HTTP header line in s.line, so
* we parse it.
*/
if (ndx > 0) /* Should always be true */
{
if (ws->line[0] == ISO_CR)
{
/* This was the last header line (i.e., and empty "\r\n"),
* so we are done with the headers and proceed with the
* actual data.
*/
ws->state = WEBCLIENT_STATE_DATA;
goto exit;
}
/* Truncate the trailing \r\n */
ws->line[ndx - 1] = '\0';
/* Check for specific HTTP header fields. */
#ifdef CONFIG_WEBCLIENT_GETMIMETYPE
if (strncasecmp(ws->line, g_httpcontenttype,
strlen(g_httpcontenttype)) == 0)
{
/* Found Content-type field. */
char *dest = strchr(ws->line, ';');
if (dest != NULL)
{
*dest = 0;
}
strncpy(ws->mimetype, ws->line + strlen(g_httpcontenttype),
sizeof(ws->mimetype));
}
else
#endif
if (strncasecmp(ws->line, g_httplocation,
strlen(g_httplocation)) == 0)
{
/* Parse the new host and filename from the URL.
*/
ninfo("Redirect to location: '%s'\n",
ws->line + strlen(g_httplocation));
ret = parseurl(ws->line + strlen(g_httplocation), ws);
ninfo("New hostname='%s' filename='%s'\n",
ws->hostname, ws->filename);
}
}
/* We're done parsing this line, so we reset the index to the start
* of the next line.
*/
ndx = 0;
}
else
{
ndx++;
}
offset++;
}
exit:
ws->offset = ++offset;
ws->ndx = ndx;
return ret;
}
/****************************************************************************
* Name: wget_gethostip
*
* Description:
* Call getaddrinfo() to get the IPv4 address associated with a hostname.
*
* Input Parameters
* hostname - The host name to use in the nslookup.
*
* Output Parameters
* dest - The location to return the IPv4 address.
*
* Returned Value:
* Zero (OK) on success; ERROR on failure.
*
****************************************************************************/
static int wget_gethostip(FAR char *hostname, FAR struct in_addr *dest)
{
#ifdef CONFIG_LIBC_NETDB
FAR struct addrinfo hint;
FAR struct addrinfo *info;
FAR struct sockaddr_in *addr;
memset(&hint, 0, sizeof(hint));
hint.ai_family = AF_INET;
if (getaddrinfo(hostname, NULL, &hint, &info) != OK)
{
return ERROR;
}
addr = (FAR struct sockaddr_in *)info->ai_addr;
memcpy(dest, &addr->sin_addr, sizeof(struct in_addr));
freeaddrinfo(info);
return OK;
#else
/* No host name support */
/* Convert strings to numeric IPv4 address */
int ret = inet_pton(AF_INET, hostname, dest);
/* The inet_pton() function returns 1 if the conversion succeeds. It will
* return 0 if the input is not a valid IPv4 dotted-decimal string or -1
* with errno set to EAFNOSUPPORT if the address family argument is
* unsupported.
*/
return (ret > 0) ? OK : ERROR;
#endif
}
/****************************************************************************
* Name: webclient_perform
*
* Returned Value:
* 0: if the operation completed successfully;
* Negative errno: On a failure
*
****************************************************************************/
int webclient_perform(FAR struct webclient_context *ctx)
{
struct sockaddr_in server;
struct wget_s *ws;
struct timeval tv;
bool redirected;
unsigned int nredirect = 0;
char *dest;
char *ep;
struct conn conn;
FAR const struct webclient_tls_ops *tls_ops = ctx->tls_ops;
FAR const char *method = ctx->method;
FAR void *tls_ctx = ctx->tls_ctx;
unsigned int i;
int len;
int ret;
/* Initialize the state structure */
ws = calloc(1, sizeof(struct wget_s));
if (!ws)
{
return -errno;
}
ws->buffer = ctx->buffer;
ws->buflen = ctx->buflen;
/* Parse the hostname (with optional port number) and filename
* from the URL.
*/
ret = parseurl(ctx->url, ws);
if (ret != 0)
{
nwarn("WARNING: Malformed URL: %s\n", ctx->url);
free(ws);
return ret;
}
ninfo("hostname='%s' filename='%s'\n", ws->hostname, ws->filename);
/* The following sequence may repeat indefinitely if we are redirected */
do
{
if (!strcmp(ws->scheme, "https") && tls_ops != NULL)
{
conn.tls = true;
}
else if (!strcmp(ws->scheme, "http"))
{
conn.tls = false;
}
else
{
nerr("ERROR: unsupported scheme: %s\n", ws->scheme);
free(ws);
return -ENOTSUP;
}
/* Re-initialize portions of the state structure that could have
* been left from the previous time through the loop and should not
* persist with the new connection.
*/
ws->httpstatus = HTTPSTATUS_NONE;
ws->offset = 0;
ws->datend = 0;
ws->ndx = 0;
if (conn.tls)
{
char port_str[sizeof("65535")];
snprintf(port_str, sizeof(port_str), "%u", ws->port);
ret = tls_ops->connect(tls_ctx, ws->hostname, port_str,
CONFIG_WEBCLIENT_TIMEOUT, &conn.tls_conn);
}
else
{
/* Create a socket */
conn.sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (conn.sockfd < 0)
{
/* socket failed. It will set the errno appropriately */
nerr("ERROR: socket failed: %d\n", errno);
free(ws);
return -errno;
}
/* Set send and receive timeout values */
tv.tv_sec = CONFIG_WEBCLIENT_TIMEOUT;
tv.tv_usec = 0;
setsockopt(conn.sockfd, SOL_SOCKET, SO_RCVTIMEO,
(FAR const void *)&tv, sizeof(struct timeval));
setsockopt(conn.sockfd, SOL_SOCKET, SO_SNDTIMEO,
(FAR const void *)&tv, sizeof(struct timeval));
/* Get the server address from the host name */
server.sin_family = AF_INET;
server.sin_port = htons(ws->port);
ret = wget_gethostip(ws->hostname, &server.sin_addr);
if (ret < 0)
{
/* Could not resolve host (or malformed IP address) */
nwarn("WARNING: Failed to resolve hostname\n");
ret = -EHOSTUNREACH;
goto errout_with_errno;
}
/* Connect to server. First we have to set some fields in the
* 'server' address structure. The system will assign me an
* arbitrary local port that is not in use.
*/
ret = connect(conn.sockfd, (struct sockaddr *)&server,
sizeof(struct sockaddr_in));
if (ret == -1)
{
ret = -errno;
}
}
if (ret < 0)
{
nerr("ERROR: connect failed: %d\n", errno);
free(ws);
return ret;
}
/* Send the request */
dest = ws->buffer;
ep = ws->buffer + ws->buflen;
dest = append(dest, ep, method);
dest = append(dest, ep, " ");
#ifndef WGET_USE_URLENCODE
dest = append(dest, ep, ws->filename);
#else
/* TODO: should we use wget_urlencode_strcpy? */
dest = append(dest, ep, ws->filename);
#endif
dest = append(dest, ep, " ");
dest = append(dest, ep, g_http10);
dest = append(dest, ep, g_httpcrnl);
dest = append(dest, ep, g_httphost);
dest = append(dest, ep, ws->hostname);
dest = append(dest, ep, g_httpcrnl);
for (i = 0; i < ctx->nheaders; i++)
{
dest = append(dest, ep, ctx->headers[i]);
dest = append(dest, ep, g_httpcrnl);
}
if (ctx->bodylen)
{
char post_size[sizeof("18446744073709551615")];
dest = append(dest, ep, g_httpcontsize);
sprintf(post_size, "%zu", ctx->bodylen);
dest = append(dest, ep, post_size);
dest = append(dest, ep, g_httpcrnl);
}
dest = append(dest, ep, g_httpuseragentfields);
if (dest == NULL)
{
ret = -E2BIG;
goto errout_with_errno;
}
len = dest - ws->buffer;
ret = conn_send_all(ctx, &conn, ws->buffer, len);
if (ret >= 0)
{
size_t sent = 0;
while (sent < ctx->bodylen)
{
FAR const void *input_buffer;
size_t input_buffer_size = ws->buflen;
size_t todo = ctx->bodylen - sent;
if (input_buffer_size > todo)
{
input_buffer_size = todo;
}
input_buffer = ws->buffer;
ret = ctx->body_callback(ws->buffer,
&input_buffer_size,
&input_buffer,
todo,
ctx->body_callback_arg);
if (ret < 0)
{
nerr("ERROR: body_callback failed: %d\n", -ret);
goto errout_with_errno;
}
ret = conn_send_all(ctx, &conn, input_buffer,
input_buffer_size);
if (ret < 0)
{
break;
}
sent += input_buffer_size;
}
}
if (ret < 0)
{
nerr("ERROR: send failed: %d\n", -ret);
goto errout_with_errno;
}
/* Now loop to get the file sent in response to the GET. This
* loop continues until either we read the end of file (nbytes == 0)
* or until we detect that we have been redirected.
*/
ws->state = WEBCLIENT_STATE_STATUSLINE;
redirected = false;
for (; ; )
{
ws->datend = conn_recv(ctx, &conn, ws->buffer, ws->buflen);
if (ws->datend < 0)
{
ret = ws->datend;
nerr("ERROR: recv failed: %d\n", -ret);
goto errout_with_errno;
}
else if (ws->datend == 0)
{
if (ws->state != WEBCLIENT_STATE_DATA)
{
nerr("Connection lost unexpectedly\n");
ret = -ECONNABORTED;
goto errout_with_errno;
}
ninfo("Connection lost\n");
break;
}
/* Handle initial parsing of the status line */
ws->offset = 0;
if (ws->state == WEBCLIENT_STATE_STATUSLINE)
{
ret = wget_parsestatus(ctx, ws);
if (ret < 0)
{
goto errout_with_errno;
}
}
/* Parse the HTTP data */
if (ws->state == WEBCLIENT_STATE_HEADERS)
{
ret = wget_parseheaders(ws);
if (ret < 0)
{
goto errout_with_errno;
}
}
/* Dispose of the data payload */
if (ws->state == WEBCLIENT_STATE_DATA)
{
if (ws->httpstatus != HTTPSTATUS_MOVED)
{
/* Let the client decide what to do with the
* received file.
*/
if (ctx->sink_callback)
{
ret = ctx->sink_callback(&ws->buffer, ws->offset,
ws->datend, &ws->buflen,
ctx->sink_callback_arg);
if (ret != 0)
{
goto errout_with_errno;
}
}
else
{
ctx->callback(&ws->buffer, ws->offset, ws->datend,
&ws->buflen, ctx->sink_callback_arg);
}
}
else
{
redirected = true;
nredirect++;
if (nredirect > CONFIG_WEBCLIENT_MAX_REDIRECT)
{
nerr("ERROR: too many redirects (%u)\n", nredirect);
goto errout;
}
break;
}
}
}
conn_close(ctx, &conn);
}
while (redirected);
free(ws);
return OK;
errout:
ret = -errno;
errout_with_errno:
conn_close(ctx, &conn);
free(ws);
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: web_post_str
****************************************************************************/
#ifdef WGET_USE_URLENCODE
char *web_post_str(FAR char *buffer, int *size, FAR char *name,
FAR char *value)
{
char *dst = buffer;
buffer = wget_strcpy(buffer, name);
buffer = wget_strcpy(buffer, "=");
buffer = wget_urlencode_strcpy(buffer, value);
*size = buffer - dst;
return dst;
}
#endif
/****************************************************************************
* Name: web_post_strlen
****************************************************************************/
#ifdef WGET_USE_URLENCODE
int web_post_strlen(FAR char *name, FAR char *value)
{
return strlen(name) + urlencode_len(value, strlen(value)) + 1;
}
#endif
/****************************************************************************
* Name: web_posts_str
****************************************************************************/
#ifdef WGET_USE_URLENCODE
char *web_posts_str(FAR char *buffer, int *size, FAR char **name,
FAR char **value, int len)
{
char *dst = buffer;
int wlen;
int i;
for (i = 0; i < len; i++)
{
if (i > 0)
{
buffer = wget_strcpy(buffer, "&");
}
wlen = *size;
buffer = web_post_str(buffer, &wlen, name[i], value[i]);
buffer += wlen;
}
*size = buffer - dst;
return dst;
}
#endif
/****************************************************************************
* Name: web_posts_strlen
****************************************************************************/
#ifdef WGET_USE_URLENCODE
int web_posts_strlen(FAR char **name, FAR char **value, int len)
{
int wlen = 0;
int i;
for (i = 0; i < len; i++)
{
wlen += web_post_strlen(name[i], value[i]);
}
return wlen + len - 1;
}
#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)
{
struct webclient_context ctx;
int ret;
webclient_set_defaults(&ctx);
ctx.method = "GET";
ctx.url = url;
ctx.buffer = buffer;
ctx.buflen = buflen;
ctx.callback = callback;
ctx.sink_callback_arg = arg;
ret = webclient_perform(&ctx);
if (ret < 0)
{
errno = -ret;
return ERROR;
}
return OK;
}
/****************************************************************************
* Name: wget_post
****************************************************************************/
int wget_post(FAR const char *url, FAR const char *posts, FAR char *buffer,
int buflen, wget_callback_t callback, FAR void *arg)
{
static const char *headers = g_httpform;
struct webclient_context ctx;
int ret;
webclient_set_defaults(&ctx);
ctx.method = "POST";
ctx.url = url;
ctx.buffer = buffer;
ctx.buflen = buflen;
ctx.callback = callback;
ctx.sink_callback_arg = arg;
ctx.headers = &headers;
ctx.nheaders = 1;
webclient_set_static_body(&ctx, posts, strlen(posts));
ret = webclient_perform(&ctx);
if (ret < 0)
{
errno = -ret;
return ERROR;
}
return OK;
}
/****************************************************************************
* Name: webclient_set_defaults
****************************************************************************/
void webclient_set_defaults(FAR struct webclient_context *ctx)
{
memset(ctx, 0, sizeof(*ctx));
ctx->method = "GET";
}
/****************************************************************************
* Name: webclient_set_static_body
****************************************************************************/
void webclient_set_static_body(FAR struct webclient_context *ctx,
FAR const void *body,
size_t bodylen)
{
ctx->body_callback = webclient_static_body_func;
ctx->body_callback_arg = (void *)body; /* discard const */
ctx->bodylen = bodylen;
}
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