wifidog源码wifidog分析用户连接

用户连接启动线程（void thread_httpd(void * args)）

此段代码是当有新用户（未认证的用户）连接时创建的线程，其主要功能为

获取用户浏览器发送过来的http报头
分析http报头，分析是否包含关键路径
不包含关键路径则调用404回调函数
包含关键路径则执行关键路径回调函数（这里主要讲解"/wifidog/auth"路径）

void
thread_httpd(void *args)
{
    void **params;
    httpd *webserver;
    request *r;

    params = (void **)args;
    webserver = *params;
    r = *(params + 1);
    free(params);

    /* 获取http报文 */
    if (httpdReadRequest(webserver, r) == 0) {
        debug(LOG_DEBUG, "Processing request from %s", r->clientAddr);
        debug(LOG_DEBUG, "Calling httpdProcessRequest() for %s", r->clientAddr);
        /* 分析http报文 */
        httpdProcessRequest(webserver, r);
        debug(LOG_DEBUG, "Returned from httpdProcessRequest() for %s", r->clientAddr);
    }
    else {
        debug(LOG_DEBUG, "No valid request received from %s", r->clientAddr);
    }
    debug(LOG_DEBUG, "Closing connection with %s", r->clientAddr);
    httpdEndRequest(r);
}



/* 被thread_httpd调用 */
void httpdProcessRequest(httpd *server, request *r)
{
    char dirName[HTTP_MAX_URL],
        entryName[HTTP_MAX_URL],
        *cp;
    httpDir *dir;
    httpContent *entry;

    r->response.responseLength = 0;
    strncpy(dirName, httpdRequestPath(r), HTTP_MAX_URL);
    dirName[HTTP_MAX_URL-1]=0;
    cp = rindex(dirName, '/');
    if (cp == NULL)
    {
        printf("Invalid request path '%s'\n",dirName);
        return;
    }
    strncpy(entryName, cp + 1, HTTP_MAX_URL);
    entryName[HTTP_MAX_URL-1]=0;
    if (cp != dirName)
        *cp = 0;
    else
        *(cp+1) = 0;

     /* 获取http报文中的关键路径，在main_loop中已经设置 */
    dir = _httpd_findContentDir(server, dirName, HTTP_FALSE);
    if (dir == NULL)
    {
        /* http报文中未包含关键路径，执行404回调函数（在404回调函数中新用户被重定向到认证服务器） */
        _httpd_send404(server, r);
        _httpd_writeAccessLog(server, r);
        return;
    }
    /* 获取关键路径内容描述符 */
    entry = _httpd_findContentEntry(r, dir, entryName);
    if (entry == NULL)
    {
        _httpd_send404(server, r);
        _httpd_writeAccessLog(server, r);
        return;
    }
    if (entry->preload)
    {
        if ((entry->preload)(server) < 0)
        {
            _httpd_writeAccessLog(server, r);
            return;
        }
    }
    switch(entry->type)
    {
        case HTTP_C_FUNCT:
        case HTTP_C_WILDCARD:
            /* 如果是被认证服务器重定向到网关的用户，此处的关键路径为"/wifidog/auth"，并执行回调函数 */
            (entry->function)(server, r);
            break;

        case HTTP_STATIC:
            _httpd_sendStatic(server, r, entry->data);
            break;

        case HTTP_FILE:
            _httpd_sendFile(server, r, entry->path);
            break;

        case HTTP_WILDCARD:
            if (_httpd_sendDirectoryEntry(server, r, entry,
                        entryName)<0)
            {
                _httpd_send404(server, r);
            }
            break;
    }
    _httpd_writeAccessLog(server, r);
}

本文章由 http://www.wifidog.pro/2015/04/02/wifidog%E6%BA%90%E7%A0%81wifidog%E5%88%86%E6%9E%90.html 整理编辑，转载请注明出处