上传个LwIP HttpClient源码(raw api)-superrf的回答

52条回答

superrf

2020-02-11 12:50

本帖最后由 superrf 于 2014-12-31 11:59 编辑

/*
HTTP CLIENT FOR RAW LWIP
(c) 2008-2009 Noyens Kenneth
PUBLIC VERSION V0.2 16/05/2009
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU LESSER GENERAL PUBLIC LICENSE Version 2.1 as published by
the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the
Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <string.h>
#include "webclient.h"
#include "utils/ustdlib.h"
// Close a PCB(connection)
void hc_clearpcb(struct tcp_pcb *pcb)
{
if(pcb != NULL)
{
// Close the TCP connection
tcp_close(pcb);
}
}
// Function that lwip calls for handling recv'd data
err_t hc_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
struct hc_state *state = arg;
char * page = NULL;
struct pbuf * temp_p;
hc_errormsg errormsg = GEN_ERROR;
int i;
if((err == ERR_OK) && (p != NULL))
{
tcp_recved(pcb, p->tot_len);
// Add payload (p) to state
temp_p = p;
while(temp_p != NULL)
{
state->RecvData = realloc(state->RecvData, temp_p->len + state->Len + 1);
// CHECK 'OUT OF MEM'
if(state->RecvData == NULL)
{
// OUT OF MEMORY
(*state->ReturnPage)(state->Num, OUT_MEM, NULL, 0);
return(ERR_OK);
}
strncpy(state->RecvData + state->Len, temp_p->payload, temp_p->len);
state->RecvData[temp_p->len + state->Len] = '';
state->Len += temp_p->len;
temp_p = temp_p->next;
}
// Removing payloads
while(p != NULL)
{
temp_p = p->next;
pbuf_free(p);
p = temp_p;
}
}
// NULL packet == CONNECTION IS CLOSED(by remote host)
else if((err == ERR_OK) && (p == NULL))
{
// Simple code for checking 200 OK
for(i=0; i < state->Len; i++)
{
if(errormsg == GEN_ERROR)
{
// Check for 200 OK
if((*(state->RecvData+i) == '2') && (*(state->RecvData+ ++i) == '0') && (*(state->RecvData+ ++i) == '0')) errormsg = OK;
if(*(state->RecvData+i) == ' ') errormsg = NOT_FOUND;
}
else
{
// Remove headers
if((*(state->RecvData+i) == ' ') && (*(state->RecvData+ ++i) == ' ') && (*(state->RecvData+ ++i) == ' ') && (*(state->RecvData + ++i) == ' '))
{
i++;
page = malloc(strlen(state->RecvData+i));
strcpy(page, state->RecvData+i);
break;
}
}
}
if(errormsg == OK)
{
// Put recv data to ---> p->ReturnPage
(*state->ReturnPage)(state->Num, OK, page, state->Len);
}
else
{
// 200 OK not found Return NOT_FOUND (WARNING: NOT_FOUND COULD ALSO BE 5xx SERVER ERROR, ...)
(*state->ReturnPage)(state->Num, errormsg, NULL, 0);
}
// Clear the PCB
hc_clearpcb(pcb);
// free the memory containing state
free(state->RecvData);
free(state);
}
return(ERR_OK);
}
// Function that lwip calls when there is an error
static void hc_error(void *arg, err_t err)
{
struct hc_state *state = arg;
// pcb already deallocated
// Call return function
// TO-DO: Check err_t err for out_mem, ...
(*state->ReturnPage)(state->Num, GEN_ERROR, NULL, 0);
free(state->RecvData);
free(state->PostVars);
free(state->Page);
free(state);
}
// Function that lwip calls when the connection is idle
// Here we can kill connections that have stayed idle for too long
static err_t hc_poll(void *arg, struct tcp_pcb *pcb)
{
struct hc_state *state = arg;
state->ConnectionTimeout++;
if(state->ConnectionTimeout > 20)
{
// Close the connection
tcp_abort(pcb);
// Give err msg to callback function
// Call return function
(*state->ReturnPage)(state->Num, TIMEOUT, NULL, 0);
}
return(ERR_OK);
}
// lwip calls this function when the remote host has successfully received data (ack)
static err_t hc_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
{
struct hc_state *state = arg;
// Reset connection timeout
state->ConnectionTimeout = 0;
return(ERR_OK);
}
// lwip calls this function when the connection is established
static err_t hc_connected(void *arg, struct tcp_pcb *pcb, err_t err)
{
struct hc_state *state = arg;
char * headers;
// error?
if(err != ERR_OK)
{
hc_clearpcb(pcb);
// Call return function
(*state->ReturnPage)(state->Num, GEN_ERROR, NULL, 0);
// Free wc state
free(state->RecvData);
free(state);
return(ERR_OK);
}
// Define Headers
if(state->PostVars == NULL)
{
// GET headers (without page)(+ ) = 19
headers = malloc(19 + strlen(state->Page));
usprintf(headers,"GET /%s HTTP/1.0 ", state->Page);
}
else
{
// POST headers (without PostVars or Page)(+ ) = 91
// Content-length: %d <== ??? (max 10)
headers = malloc(91 + strlen(state->PostVars) + strlen(state->Page) + 10);
usprintf(headers, "POST /%s HTTP/1.0 Content-type: application/x-www-form-urlencoded Content-length: %d %s ", state->Page, strlen(state->PostVars), state->PostVars);
}
// Check if we are nut running out of memory
if(headers == NULL)
{
hc_clearpcb(pcb);
// Call return function
(*state->ReturnPage)(state->Num, OUT_MEM, NULL, 0);
// Free wc state
free(state->RecvData);
free(state);
return(ERR_OK);
}
// Setup the TCP receive function
tcp_recv(pcb, hc_recv);
// Setup the TCP error function
tcp_err(pcb, hc_error);
// Setup the TCP polling function/interval //TCP_POLL IS NOT CORRECT DEFINED @ DOC!!!
tcp_poll(pcb, hc_poll, 10);
// Setup the TCP sent callback function
tcp_sent(pcb, hc_sent);
// Send data
tcp_write(pcb, headers, strlen(headers), 1);
tcp_output(pcb);
// remove headers
free(headers);
free(state->PostVars); // postvars are send, so we don't need them anymore
free(state->Page); // page is requested, so we don't need it anymore
return(ERR_OK);
}
// Public function for request a webpage (REMOTEIP, ...
int hc_open(struct ip_addr remoteIP, char *Page, char *PostVars, void (* returnpage)(u8_t, hc_errormsg, char *, u16_t))
{
struct tcp_pcb *pcb = NULL;
struct hc_state *state;
static u8_t num = 0;
// local port
u16_t port= 4545;
// Get a place for a new webclient state in the memory
state = malloc(sizeof(struct hc_state));
// Create a new PCB (PROTOCOL CONTROL BLOCK)
pcb = tcp_new();
if(pcb == NULL || state == NULL)
{
//UARTprintf("hc_open: Not enough memory for pcb or state ");
//Not enough memory
return 0;
}
// Define webclient state vars
num++;
state->Num = num;
state->RecvData = NULL;
state->ConnectionTimeout = 0;
state->Len = 0;
state->ReturnPage = returnpage;
// Make place for PostVars & Page
if(PostVars != NULL) state->PostVars = malloc(strlen(PostVars) +1);
state->Page = malloc(strlen(Page) +1);
// Check for "out of memory"
if(state->Page == NULL || (state->PostVars == NULL && PostVars != NULL))
{
free(state->Page);
free(state->PostVars);
free(state);
tcp_close(pcb);
return 0;
}
// Place allocated copy data
strcpy(state->Page, Page);
if(PostVars != NULL) strcpy(state->PostVars, PostVars);
// Bind to local IP & local port
while(tcp_bind(pcb, IP_ADDR_ANY, port) != ERR_OK)
{
// Local port in use, use port+1
port++;
}
// Use conn -> argument(s)
tcp_arg(pcb, state);
// Open connect (SEND SYN)
tcp_connect(pcb, &remoteIP, 80, hc_connected);
return num;
}

复制代码

查看其它52个回答

上传个LwIP HttpClient源码(raw api)

一周热门更多>

相关问题

相关文章

上传个LwIP HttpClient源码(raw api)

打开微信“扫一扫”，打开网页后点击屏幕右上角分享按钮

一周热门 更多>

相关问题

相关文章

采纳回答

编辑标签

举报内容

检举类型

检举原因

检举说明(必填)

打开微信“扫一扫”，打开网页后点击屏幕右上角分享按钮

付费偷看金额在0.1-10元之间

一周热门更多>