bind函数，运行的时候出现bind:permission denied 怎么解决？

yzy11 2009-06-03 11:36:46

提示错误如下：
[root@localhost~]# ./yping 5000 192.168.0.3
bind:permission denied
[root@localhost~]# ./yping 80 192.168.0.3
bind:permission denied

已经在root权限下运行了但还是不行请教各位高手怎么解决呢？十分感谢

代码为：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <sys/types.h>
#include <netinet/ip_icmp.h>

#define WAIT_TIME 3
#define BUFFER_SIZE 1024

u_short cal_cksum(const u_short *addr, register int len, u_short csum)
{
register int nleft = len;
const u_short *w = addr;
register u_short answer;
register int sum = csum;

/** 使用32位累加器实现校验码的计算
* 联系对16位数进行累加，最后将高16位与低16位进行累加
*/
while (nleft > 1) {
sum += *w++;
nleft -= 2;
}

/* 如果最后剩余8位，补齐到16位（补零，同时注意网络字节与
主机字节间的转换） */
if (nleft == 1)
sum += htons(*(u_char *)w << 8);

/** 将高低16位相加，以消除累加时进位问题*/
sum = (sum >> 16) + (sum & 0xffff); /* 高低16位相加 */
sum += (sum >> 16); /* 消除高低位相加的进位问题 */
answer = ~sum; /* 取反 */
return (answer);

}

//ICMP报头解析代码
int unpack_packet_header(char *buf,int len,struct sockaddr_in *from)
{ int i,iphdrlen;
struct ip *ip;
struct icmp *icmp;
struct timeval *tvsend;
struct timeval tvrecv;
double rtt;

ip=(struct ip *)buf;

//ip报头长度= ip_hl*4
iphdrlen=ip->ip_hl*4;

//得到ICMP报文信息
icmp=(struct icmp *)(buf+iphdrlen);

//icmp报文总长度
len-=iphdrlen;

//如果长度小于要求，退出程序
if( len<8)
{ printf("ICMP packets\'s length is less than 8\n");
return -1;
}

if( icmp->icmp_type==ICMP_ECHOREPLY)
{ tvsend=(struct timeval *)icmp->icmp_data;

gettimeofday(&tvrecv,NULL);
//得到接收时间，并计算两者时间差
if((tvrecv.tv_usec-=tvsend->tv_usec)<0){
tvrecv.tv_sec--;
tvrecv.tv_usec+=1000000;
}

tvrecv.tv_sec-=tvsend->tv_sec;

rtt=tvrecv.tv_sec*1000+tvrecv.tv_usec/1000;

//显示时间信息
printf("%d byte from %s: icmp_seq=%u ttl=%d rtt=%.3f ms\n",
len,
inet_ntoa(from->sin_addr),
icmp->icmp_seq,
ip->ip_ttl,
rtt);
} else
return -1;
}

int
main(int argc, char * argv[])
{
int sock;
struct sockaddr_in sin;
unsigned short local_port;
unsigned char protocol;
char * buffer, * buffer2, * dnsdata;
struct iphdr * ip_header;
struct icmphdr * icmp_header;
char * remote_ip_str;
unsigned short buffer_size, buffer_size2;
int tmp, len;
short randomseq;

//判断参数是否符合程序运行要求
if (argc != 3) {
fprintf(stderr, "USAGE: %s port destination\n", argv[0]);
return 1;
}

protocol = IPPROTO_ICMP;

local_port = atoi(argv[1]);
remote_ip_str = argv[2];

//创建通信所需套接字，注意套接字类型为原始套接字
if ((sock = socket(PF_INET, SOCK_RAW, protocol)) < 0) {
perror("socket");
exit(1);
}
memset(& sin, 0, sizeof(sin));
sin.sin_port = htons(local_port);

//完成套接字与端口、地址信息的绑定
if ((bind(sock, (struct sockaddr *)& sin, sizeof(sin))) < 0) {
perror("bind");
exit(1);
}

tmp = 1;
setsockopt(sock, 0, IP_HDRINCL, & tmp, sizeof(tmp));

//申请内存空间，并填写包头信息
buffer_size = sizeof(struct iphdr) + sizeof(struct icmphdr)
+ sizeof(struct timeval);
buffer_size2 = BUFFER_SIZE;
buffer = (char *) malloc(buffer_size);
buffer2 = (char *) malloc(buffer_size2);

memset(buffer, 0, sizeof(buffer));

memset(& sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = inet_addr(remote_ip_str);

ip_header = (struct iphdr *) buffer;
ip_header->ihl = 5;
ip_header->version = 4;
ip_header->tos = 0;
ip_header->tot_len = htons(buffer_size);
ip_header->id = rand();
ip_header->ttl = 64;
ip_header->frag_off = 0x40;
ip_header->protocol = protocol;
ip_header->check = 0;
ip_header->daddr = inet_addr(remote_ip_str);
ip_header->saddr = 0;

icmp_header = (struct icmphdr *) (ip_header + 1);
icmp_header->type = ICMP_ECHO;
icmp_header->code = 0;
icmp_header->un.echo.id = htons(local_port);
icmp_header->un.echo.sequence = 0;

struct timeval *tp = (struct timeval *)&buffer[28];
gettimeofday(tp, NULL);

icmp_header->checksum = cal_cksum((const u_short *) icmp_header, sizeof(struct icmphdr) + sizeof(struct timeval), 0);

//发送该IP数据包
if (sendto(sock, buffer, buffer_size, 0, (struct sockaddr *) &sin,
sizeof(struct sockaddr_in)) < 0)
{
perror("sendto");
return 1;
}

printf("send ICMP inquery\n");

len = sizeof(sin);

alarm(WAIT_TIME);
//接收对方回应的数据，并给出提示
if (recvfrom(sock, buffer2, buffer_size2, 0, (struct sockaddr *) &sin, &
len) < 0) {
perror("recvfrom");
return 1;
}
printf("received Destionation response\n");

//显示报文信息
unpack_packet_header(buffer2,buffer_size2,(struct sockaddr_in *)&sin);

close(sock);
return 0;
}

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