Android 原始套接字

网上查到，Android下的原始套接字 需要机子root之后才能使用(机子root之后到底能不能使用，我没测试过[20151103])。

PS：我看了一下，java实现的 RockSaw 的与那吗里面也是使用的jni方式。看了 jpcap-0.6.rar 的源码，貌似也是jni。

使用下面这个 Qt代码，在创建 套接字的部分 会返回错误代码（我遇到的是 errno 返回 1 或者 93）：

（工程的 AndroidManifest.xml 文件里面已经加入

“

<uses-permission android:name="android.permission.INTERNET" />

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>

”）

#include "MainWindow.h"
#include "ui_MainWindow.h"

#include <QScrollBar>
#include <QMessageBox>
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    //ui->textEdit->append();
    //ui->plainTextEdit->appendPlainText();
}

MainWindow::~MainWindow()
{
    delete ui;
}

int g_i01 = 0;
int g_i02 = 0;

void MainWindow::on_pbtnTextEdit_clicked()
{
    //ui->textEdit->setReadOnly(true);
    ui->textEdit->append(QString::number(g_i01));
    g_i01 ++;



// http://www.w-cun.com/post/diaozheng_1976.htm

// http://stackoverflow.com/questions/7411761/how-to-increase-qtablewidget-vertical-scrollbar-width
    int iWidth = ui->plainTextEdit->verticalScrollBar()->width();
    QMessageBox::about(this, "title", QString::number(iWidth));
    ui->plainTextEdit->verticalScrollBar()->setStyleSheet("QScrollBar:vertical {  "+QString::number(iWidth * 2)+"px; }");
}

void MainWindow::on_pbtnPlainTextEdit_clicked()
{/*
    ui->plainTextEdit->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
    QScrollBar* pScrollBar = ui->plainTextEdit->verticalScrollBar();
    pScrollBar->resize(pScrollBar->width() *2, pScrollBar->height());
*/
    ui->lineEdit->setReadOnly(true);
    ui->plainTextEdit->setReadOnly(true);
    //ui->textEdit->sel
    ui->plainTextEdit->appendPlainText(QString::number(g_i02));
    g_i02 ++;
    qDebug() << "on_pbtnPlainTextEdit_clicked";


/*
    QTextCharFormat fmt;
    fmt.setBackground(Qt::yellow);

    QTextCursor cursor(ui->plainTextEdit->document());
    cursor.setPosition(begin, QTextCursor::MoveAnchor);
    cursor.setPosition(end, QTextCursor::KeepAnchor);
    cursor.setCharFormat(fmt);
    */
}

int main_z();
void* thread_z(void* arg);

void MainWindow::on_pushButton_clicked()
{
    pthread_t tid1 = 0;
    int iRtn = pthread_create(&tid1, NULL, thread_z, &tid1);
    if(iRtn != 0)
    {
        QString str1 = __func__;
        QString str2 = strerror(iRtn);
        qDebug() << str1 + str2;
    }
    //main_z();
    QMessageBox::about(this, "on_pushButton_clicked", "after main_z");
}


void* thread_z(void* arg)
{
    main_z();
}

// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <linux/if_packet.h>
#include <netinet/if_ether.h>
#include <netinet/in.h>

#include <unistd.h> // 函数close()
#include <errno.h>

typedef struct _iphdr //定义IP首部
{
    unsigned char h_verlen; //4位首部长度+4位IP版本号
    unsigned char tos; //8位服务类型TOS
    unsigned short total_len; //16位总长度（字节）
    unsigned short ident; //16位标识
    unsigned short frag_and_flags; //3位标志位
    unsigned char ttl; //8位生存时间 TTL
    unsigned char proto; //8位协议 (TCP, UDP 或其他)
    unsigned short checksum; //16位IP首部校验和
    unsigned int sourceIP; //32位源IP地址
    unsigned int destIP; //32位目的IP地址
}IP_HEADER;

typedef struct _udphdr //定义UDP首部
{
    unsigned short uh_sport;    //16位源端口
    unsigned short uh_dport;    //16位目的端口
    unsigned int uh_len;//16位UDP包长度
    unsigned int uh_sum;//16位校验和
}UDP_HEADER;

typedef struct _tcphdr //定义TCP首部
{
    unsigned short th_sport; //16位源端口
    unsigned short th_dport; //16位目的端口
    unsigned int th_seq; //32位序列号
    unsigned int th_ack; //32位确认号
    unsigned char th_lenres;//4位首部长度/6位保留字
    unsigned char th_flag; //6位标志位
    unsigned short th_win; //16位窗口大小
    unsigned short th_sum; //16位校验和
    unsigned short th_urp; //16位紧急数据偏移量
}TCP_HEADER;

typedef struct _icmphdr {
    unsigned char  icmp_type;
    unsigned char icmp_code; /* type sub code */
    unsigned short icmp_cksum;
    unsigned short icmp_id;
    unsigned short icmp_seq;
    /* This is not the std header, but we reserve space for time */
    unsigned short icmp_timestamp;
}ICMP_HEADER;

void analyseIP(IP_HEADER *ip)
{
    unsigned char* p = (unsigned char*)&ip->sourceIP;
    printf("Source IP	: %u.%u.%u.%u
",p[0],p[1],p[2],p[3]);
    p = (unsigned char*)&ip->destIP;
    printf("Destination IP	: %u.%u.%u.%u
",p[0],p[1],p[2],p[3]);

}

void analyseTCP(TCP_HEADER *tcp)
{
    printf("TCP -----
");
    printf("Source port: %u
", ntohs(tcp->th_sport));
    printf("Dest port: %u
", ntohs(tcp->th_dport));
}

void analyseUDP(UDP_HEADER *udp)
{
    printf("UDP -----
");
    printf("Source port: %u
", ntohs(udp->uh_sport));
    printf("Dest port: %u
", ntohs(udp->uh_dport));
}

void analyseICMP(ICMP_HEADER *icmp)
{
    printf("ICMP -----
");
    printf("type: %u
", icmp->icmp_type);
    printf("sub code: %u
", icmp->icmp_code);
}

int main_z(void)
{
    int sockfd;
     IP_HEADER *ip;
    char buf[10240];
    ssize_t n;

    qDebug() << "main_z in";
    /* capture ip datagram without ethernet header */
    //if ((sockfd = socket(PF_PACKET,  SOCK_DGRAM, htons(ETH_P_IP)))== -1)
    if ((sockfd = socket(PF_INET, SOCK_RAW, IPPROTO_TCP|IPPROTO_UDP|IPPROTO_ICMP))== -1)
    //if ((sockfd = socket(PF_INET, SOCK_RAW, IPPROTO_IP))== -1)
    //int skt = socket(AF_INET, SOCK_STREAM, 0);
    {
        qDebug() << "socket error : "+QString::number(errno);
        printf("socket error!
");
        return 1;
    }
    return 0;
    while (1)
    {
        n = recv(sockfd, buf, sizeof(buf), 0);
        if (n == -1)
        {
            printf("recv error!
");
            break;
        }
        else if (n==0)
            continue;
        //接收数据不包括数据链路帧头
        ip = ( IP_HEADER *)(buf);
        analyseIP(ip);
        size_t iplen =  (ip->h_verlen&0x0f)*4;
        TCP_HEADER *tcp = (TCP_HEADER *)(buf +iplen);
        if (ip->proto == IPPROTO_TCP)
        {
            TCP_HEADER *tcp = (TCP_HEADER *)(buf +iplen);
            analyseTCP(tcp);
            qDebug() << "TCP";
        }
        else if (ip->proto == IPPROTO_UDP)
        {
            UDP_HEADER *udp = (UDP_HEADER *)(buf + iplen);
            analyseUDP(udp);
            qDebug() << "UDP";
        }
        else if (ip->proto == IPPROTO_ICMP)
        {
            ICMP_HEADER *icmp = (ICMP_HEADER *)(buf + iplen);
            analyseICMP(icmp);
            qDebug() << "ICMP";
        }
        else if (ip->proto == IPPROTO_IGMP)
        {
            printf("IGMP----
");
            qDebug() << "IGMP";
        }
        else
        {
            printf("other protocol!
");
            qDebug() << "other protocol !";
        }
        printf("

");

        break;
    }
    close(sockfd);
    return 0;
}