dns服务器性能测试工具,DNS服务器压力测试程序(2)

DNS 服务器压力测试程序(2)

2009-05-13 04:24:13来源&＃xff1a;未知 阅读 ()

void

gen_dns_data(char *name)

{

char b[512];

int n &＃61; 0;

char *p, *q &＃61; b;

const char *sep &＃61; ".";

char *brkt;

memcpy(dns, dns1, sizeof(dns1));

for ((p &＃61; strtok_r(name, sep, &brkt)); p; (p &＃61; strtok_r(NULL, sep, &brkt))) {

*q&＃43;&＃43; &＃61; strlen(p);

n &＃61; sprintf(q, "%s", p);

q&＃43;&＃61; n;

*q &＃61; 0;

}

n &＃61; strlen(b) &＃43; 1;

memcpy(dns &＃43; sizeof(dns1), b, n);

memcpy(dns &＃43; sizeof(dns1) &＃43; n, dns2, sizeof(dns2));

dns_len &＃61; sizeof(dns1) &＃43; n &＃43; sizeof(dns2);

}

/* check sum */

unsigned short

ip_sum (char *addr, int len)

{

register u_short nleft &＃61; len;

register u_short *w;

register int sum &＃61; 0;

w &＃61; (u_short *)addr;

while (nleft > 1) {

sum &＃43;&＃61; *w&＃43;&＃43;;

nleft -&＃61; 2;

}

if (nleft &＃61;&＃61; 1)

sum &＃43;&＃61; (*(u_char *)w & 0xff);

sum &＃61; (sum >> 16) &＃43; (sum & 0xffff);

sum &＃43;&＃61; (sum >> 16);

return (~sum & 0xffff);

}

unsigned long

getaddr(char *name)

{

struct hostent *h;

h &＃61; gethostbyname(name);

if (!h) {

printf("Unknown host %s\n", name);

exit(-1);

}

return *(unsigned long *)h->h_addr;

}

void

send_dns(unsigned long lip, unsigned long rip, unsigned short port)

{

struct iphdr ih;

struct udphdr uh;

struct sockaddr_in sin;

char buf[512];

ih.ver &＃61; 4;

ih.ihl &＃61; 5;

ih.tos &＃61; 0;

ih.len &＃61; sizeof(ih) &＃43; sizeof(uh) &＃43; dns_len;

ih.id &＃61; port;

ih.frag &＃61; 0;

ih.ttl &＃61; 64;

ih.proto &＃61; 17;

ih.sum &＃61; 0;

ih.sip &＃61; lip;

ih.dip &＃61; rip;

uh.sport &＃61; htons(port);

uh.dport &＃61; 0x3500;

uh.len &＃61; htons(sizeof(uh) &＃43; dns_len);

uh.sum &＃61; 0;

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