ping C语言实现

#include "ping.h"//icmp包的组成
struct icmp
{unsigned char type;unsigned char code;unsigned short chksum;unsigned short id;unsigned short seq;unsigned long tv_sec;//秒unsigned long tv_usec;//微妙unsigned char unused[DATASIZE];
};
/**********************
函数名：
功能：
参数：
返回值：
**********************/
unsigned short Ping_calchecksum(char *buffer, int len)
{unsigned short *p = (unsigned short *)buffer;unsigned int sum = 0;int i = 0;for (i = 0; i < len/2; i++) {sum += *p;p++;}sum += (sum >> 16);return ~sum;
}/**********************
函数名：
功能：
参数：
返回值：
**********************/
int Ping_pack(int pack_no)
{bzero(&g_icmp_data, sizeof(g_icmp_data));g_icmp_data.type = PA_RESQUST;g_icmp_data.code = 0;g_icmp_data.chksum = 0;g_icmp_data.id = 0;g_icmp_data.seq = 0;struct timeval tv;gettimeofday(&tv, NULL); g_icmp_data.tv_sec = tv.tv_sec;g_icmp_data.tv_usec = tv.tv_usec;memset(g_icmp_data.unused, 0, DATASIZE);g_icmp_data.chksum = Ping_calchecksum((char *)&g_icmp_data, sizeof(g_icmp_data));return 0;
}/*********************
函数名：Ping_mysend
功能：发送ICMP请求报文
参数：num 发送请求包的次数
返回值：0
**********************/
int Ping_mysend(int num)
{int packetsize = 0;int i = 0;char ch = 0;int rlen = 0;for (i = 0; i < num; i++){packetsize = Ping_pack(i);if (sendto(g_sockfd, &g_icmp_data, sizeof(g_icmp_data), 0, (struct sockaddr *)&g_ser, sizeof(g_ser)) < 0){perror("sendto");continue;}else{g_begin++;sleep(1);}}return 0;
}void* send_data(void* arg)
{int num = 0;if (0 == g_array[0]){Ping_mysend(PING_A);   }else if (0 == strncmp(g_array, "-a", 2)){Ping_mysend(PING_A);}else if (0 == strncmp(g_array, "-t", 2)){Ping_mysend(PING_T);}else if (0 == strncmp(g_array, "-n", 2)){num = Ping_gettimeofn(); Ping_mysend(num);}return    NULL;
}/**********************
函数名：Ping_gettimeofn
功能：获得ping -n conut 参数conut的值
返回值： sum
**********************/
int Ping_gettimeofn()
{int sum = 0;sum = atoi(g_nconut);return sum;
}/**********************
函数名：Ping_myrecv
功能：接收icmp回复报文
参数：num
返回值：接收的次数，依据参数和发送的次数定
**********************/
int Ping_myrecv(int num)
{int rlen = 0;int i = 0;char ch = 0;int ret = 0;while (i < num){memset(g_buffer_recv, 0, sizeof(g_buffer_recv));rlen = recv(g_sockfd, g_buffer_recv, sizeof(g_buffer_recv), 0);if (rlen < 0){printf("fail to recv!\n");continue;}i++;    ret = Ping_unpack(rlen);if (-1 == ret){continue;}else{g_end++;}    }return 0;
}void* recv_data(void *arg)
{int num = 0;if (0 == g_array[0]){Ping_myrecv(PING_A);   }else if (0 == strncmp(g_array, "-a", 2)){Ping_myrecv(PING_A);}else if (0 == strncmp(g_array, "-t", 2)){Ping_myrecv(PING_T);}else if (0 == strncmp(g_array, "-n", 2)){num = Ping_gettimeofn();Ping_myrecv(num);}return NULL;
}/**********************
函数名：Ping_unpack
功能：解析响应数据包、判断是否返回正常
参数：len 响应数据包长度
返回值：成功返回0，失败返回-1
**********************/
int Ping_unpack(int len)
{double rtt = 0;struct timeval tv_cur;struct ip *myip;struct icmp *myicmp;int ipsize = 0; char *recv_ip = NULL;myip = (struct ip*)g_buffer_recv;ipsize = (myip->ip_hl)<<2;recv_ip = (char *)inet_ntoa(myip->ip_src);len -= ipsize;myicmp = (struct icmp *)(g_buffer_recv + ipsize);if (len < UP_ICMPHEAD)   {perror("ICMP packets length is less than 8\n");return -1;}else if(strcmp(g_ip, recv_ip)) {return -1;}    else if (myicmp->type != 0) {return -1;}    else{gettimeofday(&tv_cur, NULL);rtt = (tv_cur.tv_sec - g_icmp_data.tv_sec)*1000 + (tv_cur.tv_usec - g_icmp_data.tv_usec)/1000.0f;g_totaltime += rtt;if (rtt > g_maxtime){g_maxtime = rtt;}   if (rtt < g_mintime){g_mintime = rtt;}printf("%d byte from %s: icmp_seq=%u ttl=%d rtt=%0.1fms\n", g_datalen + UP_ICMPHEAD, inet_ntoa(g_ser.sin_addr), g_end,  myip->ip_ttl, rtt);}return 0;
}/**********************
函数名：sig_int
功能：收到结束线程信号后，打印数据
参数：signo
**********************/
void sig_int(int signo)
{double perce = 0;perce = (g_begin - g_end) / g_begin;printf("---ping %s is complete--- \n %d was sended and %d was received, %0.1lf%%packet loss, time %0.1fms rtt\n min/avg/max = %0.1f/%0.1f/%0.1f ms \n", g_tmpbuff, g_begin, g_end, perce * 100 , g_totaltime, g_mintime, g_totaltime/g_begin, g_maxtime);exit(0);
}int main(int argc, char *argv[])
{double number = 0;struct hostent *ent = NULL;pthread_t pid1 = 0, pid2 = 0;signal(SIGINT, sig_int);snprintf(g_tmpbuff, sizeof(g_tmpbuff), "%s", argv[1]);if (argc < 2){return -1;}if (argv[1] == NULL){perror("fail to ping!");return -1;}if (argc > 2){memset(g_array, 0, sizeof(g_array));memset(g_nconut, 0, sizeof(g_nconut));snprintf(g_array, sizeof(g_array), "%s", argv[2]);}if (argc > 3){    if (0 == strncmp(g_array, "-n", 2)){snprintf(g_nconut, sizeof(g_nconut), "%s", argv[3]); }}   ent = gethostbyname(argv[1]);if (NULL == ent){printf("ping: unknown host %s\n", argv[1]);exit(-1);}inet_ntop(AF_INET, ent->h_addr, g_ip, sizeof(g_ip));  //将二进制的32位ip地址转换成字符串的点分十进制g_sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);//设置目标地址bzero(&g_ser, sizeof(g_ser));g_ser.sin_family = AF_INET;inet_pton(AF_INET, g_ip, &g_ser.sin_addr); //把点分十进制转化成二进制地址printf("PING %s (%s) %d bytes of data.\n", g_tmpbuff, g_ip, g_datalen);//创建线程进行收发数据if(pthread_create(&pid1, NULL, send_data, NULL) < 0){perror("pthread_create");return -1;}if(pthread_create(&pid2, NULL, recv_data, NULL) < 0){perror("pthread_create");return -1;}pthread_join(pid1, NULL);pthread_join(pid2, NULL);number = (g_begin - g_end) * 100 / g_begin;printf("---ping %s is complete--- \n %d was sended and %d was received, %0.1lf%%packet loss, time %0.1fms \n min/avg/max = %0.1f/%0.1f/%0.1f ms \n", argv[1], g_begin, g_end, number, g_totaltime, g_mintime, g_totaltime/g_begin, g_maxtime);close(g_sockfd);return 0;
}

头文件#ifndef PING__H_
#define PING__H_#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/select.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netdb.h>
#include <sys/time.h>
#include <signal.h>
#include <netinet/ip.h>
#include <netinet/in.h>
#include <pthread.h>#define BUFFER_SIZE       512
#define MAX_SIZE          56
#define ARRAY_SIZE        12
#define NCONUT_SIZE       12
#define ARGV1             128
#define MINSIZE           1000
#define DATASIZE          48
#define PING_A            4
#define PING_T            100
#define UP_ICMPHEAD       8
#define PA_RESQUST        8struct icmp g_icmp_data;
struct sockaddr_in g_ser;
int g_begin = 0;
int g_end = 0;
int g_sockfd = 0;
char g_buffer_recv[BUFFER_SIZE] = {0};
int g_datalen = MAX_SIZE;
char g_array[ARRAY_SIZE] = {0};
char g_nconut[NCONUT_SIZE] = {0};
char g_tmpbuff[ARGV1] = {0};
double g_totaltime = 0;
double g_maxtime = 0;
double g_mintime = MINSIZE;
char g_ip[32] = {0};int Ping_compareInput();
int Ping_gettimeofn();
unsigned short Ping_calchecksum(char *buffer, int len);
int Ping_pack(int pack_no);
int Ping_mysend();
int Ping_myrecv();
int Ping_unpack(int len);#endif

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