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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="316.htm">上一层</a>][<a href="407.htm">下一篇</a>]
<hr><p align="left"><small>发信人: biff (大可), 信区: Security <br>
标 题: [转载] newscan <br>
发信站: 武汉白云黄鹤站 (Wed Jun 2 17:24:01 1999), 站内信件 <br>
<br>
【 以下文字转载自 Winsock 讨论区 】 <br>
【 原文由 biff 所发表 】 <br>
/* <br>
* Half open port scanner. Send SYNs, and look for a SYN-ACK. If you see one, <br>
* the port is listening. <br>
* <br>
* The whole point is to evade TCP-wrapper software and other alarm systems <br>
* which look for a fully established connection. Since this never establishes <br>
* a connection, its existance isn't logged. <br>
* <br>
* Note, this can be detected by things like TCPdump, or other raw network <br>
* monitors. <br>
* <br>
* Runs under SunOS 4.x with NIT. This is a proof-of-concept toy, not a <br>
* production model. :-) <br>
* <br>
* Mike Neuman <br>
* 12/7/93 <br>
* <br>
* <br>
* You can do whatever you want with this code as long as you leave this <br>
* header intact. <br>
* <br>
* Contact information: <br>
* <br>
* Mike Neuman (mcn@EnGarde.com) <br>
*/ <br>
<br>
#include <stdio.h> <br>
#include <netdb.h> <br>
#include <ctype.h> <br>
#include <signal.h> <br>
#include <errno.h> <br>
#include <malloc.h> <br>
#include <setjmp.h> <br>
#include <sys/types.h> <br>
#include <sys/time.h> <br>
#include <sys/timeb.h> <br>
#include <sys/socket.h> <br>
#include <sys/file.h> <br>
#include <sys/ioctl.h> <br>
#include <net/nit.h> <br>
#include <sys/fcntlcom.h> <br>
<br>
#include <sys/param.h> <br>
#include <sys/dir.h> <br>
#include <net/nit_if.h> <br>
#include <net/nit_pf.h> <br>
#include <net/nit_buf.h> <br>
#include <net/packetfilt.h> <br>
#include <sys/stropts.h> <br>
<br>
#include <net/if.h> <br>
#include <netinet/in.h> <br>
#include <netinet/in_systm.h> <br>
#include <netinet/ip.h> <br>
#include <netinet/if_ether.h> <br>
#include <netinet/ip_var.h> <br>
#include <netinet/udp.h> <br>
#include <netinet/udp_var.h> <br>
#include <netinet/tcp.h> <br>
#include <netinet/tcpip.h> <br>
#include <sys/stream.h> <br>
#include <sys/tihdr.h> <br>
<br>
#include <rpc/rpc.h> <br>
#include <rpc/pmap_prot.h> <br>
#include <rpc/pmap_clnt.h> <br>
<br>
/* RPC makes an rpcdump call, which may be logged by a secure portmapper. <br>
* If you're paranoid and want to guess at rpc stuff, specify -r <br>
*/ <br>
<br>
main(argc,argv) <br>
int argc; <br>
char *argv[]; <br>
<br>
{ <br>
struct sockaddr_in server; <br>
struct servent *sp; <br>
struct hostent *hp; <br>
int c, s, count, userpc=1, sock=RPC_ANYSOCK, minport = 1, maxport = 6001; <br>
struct pmaplist *head = NULL, *headp=NULL; <br>
struct timeval timeout; <br>
register CLIENT *client; <br>
struct rpcent *rpc; <br>
unsigned long addr; <br>
char *hostp; <br>
extern char *optarg; <br>
extern int optind; <br>
<br>
<br>
/* 1: Parse options, get host addr */ <br>
while ((c = getopt(argc, argv, "rhm:M:")) != -1) <br>
switch(c) { <br>
case 'r': <br>
userpc = 0; <br>
break; <br>
case 'm': <br>
minport = atoi(optarg); <br>
break; <br>
case 'M': <br>
maxport = atoi(optarg); <br>
break; <br>
case 'h': <br>
usage(argv[0]); <br>
exit(1); <br>
} <br>
} <br>
<br>
if (optind != argc-1) { <br>
usage(argv[0]); <br>
exit(1); <br>
} <br>
<br>
if (minport > maxport || minport <= 0) { <br>
fprintf(stderr, "ERROR: minport must be > 0 and <= maxport\n"); <br>
usage(argv[0]); <br>
exit(1); <br>
} <br>
hostp = argv[optind]; <br>
<br>
if ((hp=gethostbyname(hostp))==NULL) { <br>
addr = inet_addr(hostp); <br>
if (addr == (u_long)-1) { <br>
fprintf(stderr, "Unknown host '%s'\n", hostp); <br>
usage(argv[0]); <br>
exit(1); <br>
} <br>
bcopy(&server.sin_addr, &addr, 4); <br>
} else { <br>
} else { <br>
bzero((char *)&server, sizeof server); <br>
bcopy(hp->h_addr, (char *)&server.sin_addr, hp->h_length); <br>
server.sin_family=hp->h_addrtype; <br>
} <br>
<br>
printf("Connections established for host %s:\n",hostp); <br>
<br>
/* 2: Call rpc and get its ports */ <br>
head=NULL; <br>
if (userpc) { <br>
server.sin_port=htons(PMAPPORT); <br>
timeout.tv_sec=10; <br>
timeout.tv_usec=0; <br>
if ((client = clnttcp_create(&server, PMAPPROG, <br>
PMAPVERS, &sock, 50, 500))!=NULL) { <br>
if (clnt_call(client, PMAPPROC_DUMP, xdr_void, NULL, <br>
xdr_pmaplist, &head, timeout) != RPC_SUCCESS) <br>
head=NULL; <br>
} <br>
} <br>
<br>
/* 3: Try each port from minport - maxport */ <br>
for (count=minport;count<=maxport;count++) { <br>
printf("\r%6d",count); <br>
fflush(stdout); <br>
server.sin_port=count; <br>
if (!fakeconnect(&server, hostp)) { <br>
printf("\r %4d tcp ",count); <br>
sp=getservbyport(count,"tcp"); <br>
if (sp==NULL) { <br>
switch(count) { <br>
/* Put in known services not in /etc/services here */ <br>
case 2000: printf("(Xnews)"); <br>
break; <br>
case 6000: printf("(X)"); <br>
break; <br>
default: <br>
if (userpc) { <br>
headp=head; <br>
while (headp!=NULL) { <br>
if (headp->pml_map.pm_prot!=IPPROTO_TCP) { <br>
headp=headp->pml_next; <br>
continue; <br>
} <br>
if (count!=headp->pml_map.pm_port) { <br>
headp=headp->pml_next; <br>
continue; <br>
} <br>
rpc = getrpcbynumber(headp->pml_map.pm_prog); <br>
if (rpc) { <br>
printf("%-15s [rpc]", rpc->r_name); <br>
break; <br>
} else { <br>
headp=headp->pml_next; <br>
continue; <br>
} <br>
} <br>
if (rpc==NULL) <br>
printf(" [rpc]"); <br>
} else <br>
printf("???\n"); <br>
break; <br>
} <br>
} else <br>
printf("%-15s",sp->s_name); <br>
printf("\n"); <br>
} <br>
} <br>
printf("\n"); <br>
exit(0); <br>
} <br>
<br>
usage(prog) <br>
char *prog; <br>
{ <br>
fprintf(stderr,"Usage: %s [-r] [-m minport] [-M maxport] host\n", prog); <br>
fprintf(stderr,"Options:\n"); <br>
fprintf(stderr,"-r Don't use RPC for port info\n"); <br>
fprintf(stderr,"-m port Specify port number to start at (default 1)\n"); <br>
fprintf(stderr,"-M port Specify port number to end at (default 6001)\n"); <br>
return; <br>
} <br>
<br>
<br>
int scan_return(fd, iph, tcph) <br>
int fd; <br>
struct ip *iph; <br>
struct tcphdr *tcph; <br>
<br>
{ <br>
char buf[8*1024], *bp, *bufstop, *cp, abuf[2048]; <br>
int cc, done=0, retval=0; <br>
struct nit_bufhdr *hdrp; <br>
struct nit_iftime *ntp; <br>
struct nit_ifdrops *ndp; <br>
struct nit_iflen *nlp; <br>
struct ether_header *ep; <br>
u_short et; <br>
register struct ip *ip; <br>
struct tcphdr *tp; <br>
<br>
while (!done) { <br>
if ((cc=read(fd, buf, 8*1024)) >= 0) { <br>
bp=buf; <br>
bufstop = buf+cc; <br>
while (bp < bufstop) { <br>
cp = bp; <br>
<br>
/* Get past NIT buffer */ <br>
hdrp = (struct nit_bufhdr *)cp; <br>
cp += sizeof(*hdrp); <br>
<br>
/* get past NIT timer */ <br>
ntp = (struct nit_iftime *)cp; <br>
cp += sizeof(*ntp); <br>
<br>
/* get past the drops */ <br>
ndp = (struct nit_ifdrops *)cp; <br>
cp += sizeof(*ndp); <br>
<br>
/* get past packet len */ <br>
nlp = (struct nit_iflen *)cp; <br>
cp += sizeof(*nlp); <br>
<br>
/* next snapshot */ <br>
bp += hdrp->nhb_totlen; <br>
<br>
/* Okay, got the packet, make sure it's a SYN-ACK reply */ <br>
ep = (struct ether_header *)cp; <br>
et = ntohs(ep->ether_type); <br>
if ( et >= ETHERTYPE_TRAIL && et < ETHERTYPE_TRAIL+ETHERTYPE_NTRAILER) <br>
continue; <br>
cp += sizeof(struct ether_header); <br>
nlp->nh_pktlen -= sizeof(struct ether_header); <br>
if (et != ETHERTYPE_IP) continue; <br>
<br>
/* It's: ethernet + IP */ <br>
<br>
ip=(struct ip *)cp; <br>
bcopy((char *)ip, (char *)abuf, nlp->nh_pktlen); /* Align */ <br>
ip = (struct ip *)abuf; <br>
<br>
if (ip->ip_p != IPPROTO_TCP) <br>
continue; <br>
<br>
/* It's ethernet + IP + TCP */ <br>
if (ip->ip_src.s_addr != iph->ip_dst.s_addr) <br>
continue; <br>
if (ip->ip_dst.s_addr != iph->ip_src.s_addr) <br>
continue; <br>
<br>
/* It's ethernet + IP + TCP + from target + to us */ <br>
cp+=sizeof(struct ip); <br>
tp = (struct tcphdr *)cp; <br>
if (tp->th_sport != tcph->th_dport) <br>
continue; <br>
if (tp->th_dport != tcph->th_sport) <br>
continue; <br>
<br>
/* It's ethernet + IP + TCP + from target + to us + ports right */ <br>
if ((tp->th_flags & (TH_SYN|TH_ACK)) == (TH_SYN|TH_ACK)) { <br>
retval=0; <br>
done=1; <br>
} else { <br>
retval=1; <br>
done=1; <br>
} <br>
break; <br>
} /* While (bp<bufstop) */ <br>
} /* if read */ <br>
} /* while !done */ <br>
return(retval); <br>
} <br>
<br>
jmp_buf env_buf; <br>
<br>
<br>
/* Signal handler for receive timeout */ <br>
handle_alarm() <br>
{ <br>
alarm(0); /* Clear the alarm */ <br>
longjmp(env_buf, 1); <br>
} <br>
<br>
/* <br>
* Sends a packet, and waits for the reply <br>
*/ <br>
int send_packet(fd, server, servername, localnet, netmask) <br>
int fd; <br>
struct sockaddr_in *server; <br>
char *servername; <br>
u_long localnet; <br>
u_long netmask; <br>
<br>
{ <br>
static struct sockaddr sa; <br>
static struct strbuf ctl, datah; <br>
static struct ip iph; <br>
static char buf[2048], pbuf[2048], *oldbp; <br>
static int computed=0; <br>
<br>
struct ether_header eh; <br>
struct tcphdr tcph; <br>
char *bp, *pbp; <br>
struct ether_addr myaddr, faddr; <br>
FILE *fp; <br>
struct hostent *he; <br>
u_long x; <br>
int retval; <br>
<br>
if (!computed) { <br>
/* ARP for the router/host, if possible */ <br>
int s; <br>
struct arpreq arpreq; <br>
struct sockaddr_in *s_arp; <br>
<br>
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { <br>
perror("Socket"); <br>
exit(1); <br>
} <br>
<br>
<br>
arpreq.arp_pa.sa_family = AF_INET; <br>
s_arp = (struct sockaddr_in *)&arpreq.arp_pa; <br>
s_arp->sin_family = AF_INET; <br>
s_arp->sin_addr.s_addr = server->sin_addr.s_addr; <br>
<br>
/* First, send junk to it to get an ARP entry */ <br>
s_arp->sin_port = 9; <br>
sendto(s, "blah", 4, 0, (struct sockaddr *)s_arp, <br>
sizeof(struct sockaddr_in)); <br>
s_arp = (struct sockaddr_in *)&arpreq.arp_ha; <br>
s_arp->sin_family = AF_UNSPEC; <br>
<br>
if (ioctl(s, SIOCGARP, &arpreq) < 0) { <br>
perror("ioctl"); <br>
close(s); <br>
exit(1); <br>
} <br>
<br>
if (arpreq.arp_flags & ATF_COM) { <br>
bcopy(arpreq.arp_ha.sa_data, &faddr, 6); <br>
} else { <br>
fprintf(stderr, "Can't find destination/router hardware address.\n"); <br>
exit(1); <br>
} <br>
/* faddr and myaddr are now computed, create the ether header */ <br>
bcopy(&faddr, &eh.ether_dhost, 6); <br>
eh.ether_type = htons(ETHERTYPE_IP); <br>
sa.sa_family = AF_UNSPEC; <br>
bcopy((char *)&eh, (char *)sa.sa_data, sizeof(struct ether_header)); <br>
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