153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
/*
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* (C)opyright 1993,1994,1995 by Darren Reed.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and due credit is given
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* to the original author and the contributors.
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*/
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/*
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icmp type
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lnth proto source destination src port dst port
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etherfind -n
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60 tcp 128.250.20.20 128.250.133.13 2419 telnet
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etherfind -n -t
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0.32 91 04 131.170.1.10 128.250.133.13
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0.33 566 udp 128.250.37.155 128.250.133.3 901 901
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*/
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#include <stdio.h>
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#include <string.h>
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#if !defined(__SVR4) && !defined(__GNUC__)
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#include <strings.h>
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#endif
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#include <sys/types.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stddef.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/tcpip.h>
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#include <net/if.h>
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#include <netdb.h>
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#include "ip_compat.h"
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#include "ipf.h"
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#include "ipt.h"
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#if !defined(lint) && defined(LIBC_SCCS)
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static char sccsid[] = "@(#)ipft_ef.c 1.6 2/4/96 (C)1995 Darren Reed";
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static char rcsid[] = "$Id: ipft_ef.c,v 2.0.2.4 1997/04/30 13:55:06 darrenr Exp $";
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#endif
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static int etherf_open __P((char *));
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static int etherf_close __P((void));
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static int etherf_readip __P((char *, int, char **, int *));
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struct ipread etherf = { etherf_open, etherf_close, etherf_readip };
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static FILE *efp = NULL;
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static int efd = -1;
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static int etherf_open(fname)
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char *fname;
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{
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if (efd != -1)
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return efd;
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if (!strcmp(fname, "-")) {
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efd = 0;
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efp = stdin;
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} else {
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efd = open(fname, O_RDONLY);
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efp = fdopen(efd, "r");
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}
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return efd;
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}
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static int etherf_close()
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{
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return close(efd);
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}
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static int etherf_readip(buf, cnt, ifn, dir)
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char *buf, **ifn;
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int cnt, *dir;
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{
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struct tcpiphdr pkt;
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struct ip *ip = (struct ip *)&pkt;
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struct protoent *p = NULL;
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char src[16], dst[16], sprt[16], dprt[16];
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char lbuf[128], len[8], prot[8], time[8], *s;
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int slen, extra = 0, i, n;
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if (!fgets(lbuf, sizeof(lbuf) - 1, efp))
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return 0;
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if ((s = strchr(lbuf, '\n')))
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*s = '\0';
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lbuf[sizeof(lbuf)-1] = '\0';
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bzero(&pkt, sizeof(pkt));
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if ((n = sscanf(lbuf, "%s %s %s %s %s %s", len, prot, src, dst,
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sprt, dprt)) != 6)
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if ((n = sscanf(lbuf, "%s %s %s %s %s %s %s", time,
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len, prot, src, dst, sprt, dprt)) != 7)
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return -1;
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ip->ip_p = atoi(prot);
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if (ip->ip_p == 0) {
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if (!(p = getprotobyname(prot)))
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return -1;
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ip->ip_p = p->p_proto;
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}
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switch (ip->ip_p) {
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case IPPROTO_TCP :
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case IPPROTO_UDP :
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s = strtok(NULL, " :");
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ip->ip_len += atoi(s);
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if (p->p_proto == IPPROTO_TCP)
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extra = sizeof(struct tcphdr);
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else if (p->p_proto == IPPROTO_UDP)
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extra = sizeof(struct udphdr);
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break;
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#ifdef IGMP
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case IPPROTO_IGMP :
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extra = sizeof(struct igmp);
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break;
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#endif
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case IPPROTO_ICMP :
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extra = sizeof(struct icmp);
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break;
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default :
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break;
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}
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(void) inet_aton(src, &ip->ip_src);
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(void) inet_aton(dst, &ip->ip_dst);
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ip->ip_len = atoi(len);
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ip->ip_hl = sizeof(struct ip);
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slen = ip->ip_hl + extra;
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i = MIN(cnt, slen);
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bcopy((char *)&pkt, buf, i);
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return i;
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}
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