/*设置ICMP报头*/
int pack(int pack_no)
{ int i,packsize;
struct icmp *icmp;
struct timeval *tval;
icmp=(struct icmp*)sendpacket;
icmp->icmp_type=ICMP_ECHO;
icmp->icmp_code=0;
icmp->icmp_cksum=0;
icmp->icmp_seq=pack_no;
icmp->icmp_id=pid;
packsize=8+datalen;
tval= (struct timeval *)icmp->icmp_data;
gettimeofday(tval,NULL); /*记录发送时间*/
icmp->icmp_cksum=cal_chksum( (unsigned short *)icmp,packsize); /*校验算法*/
return packsize;
}
/*设置ICMP报头*/
int pack(int pack_no,char icmp_hd[])
{
int i,packsize;
struct icmp *icmp;
struct timeval *tval;
icmp=(struct icmp*)icmp_hd;
icmp->icmp_type=ICMP_ECHO;
icmp->icmp_code=0;
icmp->icmp_cksum=0;
icmp->icmp_seq=pack_no;
icmp->icmp_id=9;
packsize=200; //发送的报文长度
tval=(struct timeval *)icmp->icmp_data;
gettimeofday(tval,NULL); //记录发送时间
icmp->icmp_cksum=cal_chksum((unsigned short *)icmp,packsize); //校验算法
return packsize;
}
int pack(int pack_no, char *sendpacket, pid_t pid)
{
int packet_size;
struct icmp *icmp;
struct timeval *tval;
icmp = (struct icmp*)sendpacket;
icmp->icmp_type = ICMP_ECHO;
icmp->icmp_code = 0;
icmp->icmp_cksum = htons(0);
icmp->icmp_seq = htons(pack_no);
icmp->icmp_id = htons(pid);
packet_size = PINGS_ICMP_HEADER_SIZE + PINGS_ICMP_DEFAULT_DATA_SIZE;
tval = (struct timeval *)icmp->icmp_data;
gettimeofday(tval, NULL);
icmp->icmp_cksum = cal_chksum((unsigned short *)icmp, packet_size);
return packet_size;
}
int write_new_file(char *file_buf, int file_len)
{
puts("===================================");
puts("recv:");
t_disbuf(file_buf, file_len);
puts("===================================");
int tmp_len = 0;
int fname_len = 0;
int fdata_len = 0;
int write_len = 0;
char fname[256] = {0};
char fdata[4096] = {0};
unsigned short chk_src = 0;
unsigned short chk_dst = 0;
memcpy(&fname_len, file_buf, sizeof(int));
memcpy(fname, file_buf + sizeof(int), fname_len);
memcpy(&fdata_len, file_buf + sizeof(int) + fname_len, sizeof(int));
memcpy(fdata, file_buf + 2*sizeof(int) + fname_len, fdata_len);
memcpy(&chk_src, file_buf + 2*sizeof(int) + fname_len + fdata_len, sizeof(short));
chk_dst = cal_chksum( (unsigned short *)fdata, fdata_len); /*校验算法*/
printf("chksum is:%d\n", chk_dst);
if (chk_src != chk_dst)
{
printf("file has not completely transfered\n");
return -1;
}
else
printf("start to recive file\n");
printf("fname is:%s\n", fname);
puts("===================================");
puts("fdata:");
t_disbuf(fdata, fdata_len);
puts("===================================");
FILE *fp = fopen(fname, "w+");
if (fp == NULL)
{
printf("File:\t%s Can Not Open To Write!\n", fname);
return -1;
}
while (tmp_len < fdata_len)
{
write_len = fwrite(fdata, sizeof(char), fdata_len, fp);
tmp_len = tmp_len + write_len;
}
fclose(fp);
return 1;
}
