403 lines
8.4 KiB
C
403 lines
8.4 KiB
C
/* $NetBSD: ipsend.c,v 1.1.1.1 1999/12/11 22:24:09 veego Exp $ */
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/*
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* ipsend.c (C) 1995-1998 Darren Reed
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*
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* This was written to test what size TCP fragments would get through
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* various TCP/IP packet filters, as used in IP firewalls. In certain
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* conditions, enough of the TCP header is missing for unpredictable
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* results unless the filter is aware that this can happen.
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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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#if !defined(lint)
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static const char sccsid[] = "@(#)ipsend.c 1.5 12/10/95 (C)1995 Darren Reed";
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static const char rcsid[] = "@(#)Id: ipsend.c,v 2.1.2.2 1999/11/28 03:43:44 darrenr Exp";
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/socket.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.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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#ifndef linux
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#include <netinet/ip_var.h>
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#endif
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#include "ipsend.h"
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#include "ipf.h"
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extern char *optarg;
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extern int optind;
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extern void iplang __P((FILE *));
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char options[68];
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int opts;
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#ifdef linux
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char default_device[] = "eth0";
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#else
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# ifdef sun
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char default_device[] = "le0";
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# else
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# ifdef ultrix
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char default_device[] = "ln0";
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# else
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# ifdef __bsdi__
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char default_device[] = "ef0";
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# else
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# ifdef __sgi
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char default_device[] = "ec0";
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# else
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char default_device[] = "lan0";
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# endif
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# endif
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# endif
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# endif
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#endif
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static void usage __P((char *));
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static void do_icmp __P((ip_t *, char *));
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int main __P((int, char **));
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static void usage(prog)
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char *prog;
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{
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fprintf(stderr, "Usage: %s [options] dest [flags]\n\
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\toptions:\n\
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\t\t-d\tdebug mode\n\
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\t\t-i device\tSend out on this device\n\
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\t\t-f fragflags\tcan set IP_MF or IP_DF\n\
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\t\t-g gateway\tIP gateway to use if non-local dest.\n\
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\t\t-I code,type[,gw[,dst[,src]]]\tSet ICMP protocol\n\
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\t\t-m mtu\t\tfake MTU to use when sending out\n\
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\t\t-P protocol\tSet protocol by name\n\
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\t\t-s src\t\tsource address for IP packet\n\
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\t\t-T\t\tSet TCP protocol\n\
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\t\t-t port\t\tdestination port\n\
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\t\t-U\t\tSet UDP protocol\n\
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\t\t-v\tverbose mode\n\
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\t\t-w <window>\tSet the TCP window size\n\
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", prog);
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fprintf(stderr, "Usage: %s [-dv] -L <filename>\n\
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\toptions:\n\
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\t\t-d\tdebug mode\n\
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\t\t-L filename\tUse IP language for sending packets\n\
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\t\t-v\tverbose mode\n\
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", prog);
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exit(1);
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}
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static void do_icmp(ip, args)
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ip_t *ip;
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char *args;
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{
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struct icmp *ic;
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char *s;
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ip->ip_p = IPPROTO_ICMP;
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ip->ip_len += sizeof(*ic);
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ic = (struct icmp *)(ip + 1);
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bzero((char *)ic, sizeof(*ic));
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if (!(s = strchr(args, ',')))
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{
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fprintf(stderr, "ICMP args missing: ,\n");
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return;
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}
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*s++ = '\0';
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ic->icmp_type = atoi(args);
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ic->icmp_code = atoi(s);
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if (ic->icmp_type == ICMP_REDIRECT && strchr(s, ','))
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{
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char *t;
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t = strtok(s, ",");
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t = strtok(NULL, ",");
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if (resolve(t, (char *)&ic->icmp_gwaddr) == -1)
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{
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fprintf(stderr,"Cant resolve %s\n", t);
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exit(2);
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}
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if ((t = strtok(NULL, ",")))
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{
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if (resolve(t, (char *)&ic->icmp_ip.ip_dst) == -1)
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{
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fprintf(stderr,"Cant resolve %s\n", t);
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exit(2);
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}
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if ((t = strtok(NULL, ",")))
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{
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if (resolve(t,
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(char *)&ic->icmp_ip.ip_src) == -1)
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{
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fprintf(stderr,"Cant resolve %s\n", t);
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exit(2);
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}
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}
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}
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}
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}
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int send_packets(dev, mtu, ip, gwip)
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char *dev;
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int mtu;
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ip_t *ip;
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struct in_addr gwip;
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{
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u_short sport = 0;
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int wfd;
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if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
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sport = ((struct tcpiphdr *)ip)->ti_sport;
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wfd = initdevice(dev, sport, 5);
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return send_packet(wfd, mtu, ip, gwip);
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}
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int main(argc, argv)
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int argc;
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char **argv;
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{
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FILE *langfile = NULL;
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struct tcpiphdr *ti;
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struct in_addr gwip;
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tcphdr_t *tcp;
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ip_t *ip;
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char *name = argv[0], host[MAXHOSTNAMELEN + 1];
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char *gateway = NULL, *dev = NULL;
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char *src = NULL, *dst, *s;
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int mtu = 1500, olen = 0, c, nonl = 0;
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/*
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* 65535 is maximum packet size...you never know...
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*/
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ip = (ip_t *)calloc(1, 65536);
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ti = (struct tcpiphdr *)ip;
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tcp = (tcphdr_t *)&ti->ti_sport;
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ip->ip_len = sizeof(*ip);
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ip->ip_hl = sizeof(*ip) >> 2;
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while ((c = getopt(argc, argv, "I:L:P:TUdf:i:g:m:o:s:t:vw:")) != -1)
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switch (c)
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{
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case 'I' :
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nonl++;
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if (ip->ip_p)
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{
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fprintf(stderr, "Protocol already set: %d\n",
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ip->ip_p);
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break;
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}
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do_icmp(ip, optarg);
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break;
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case 'L' :
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if (nonl) {
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fprintf(stderr,
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"Incorrect usage of -L option.\n");
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usage(name);
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}
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if (!strcmp(optarg, "-"))
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langfile = stdin;
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else if (!(langfile = fopen(optarg, "r"))) {
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fprintf(stderr, "can't open file %s\n",
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optarg);
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exit(1);
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}
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iplang(langfile);
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return 0;
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case 'P' :
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{
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struct protoent *p;
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nonl++;
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if (ip->ip_p)
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{
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fprintf(stderr, "Protocol already set: %d\n",
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ip->ip_p);
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break;
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}
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if ((p = getprotobyname(optarg)))
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ip->ip_p = p->p_proto;
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else
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fprintf(stderr, "Unknown protocol: %s\n",
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optarg);
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break;
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}
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case 'T' :
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nonl++;
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if (ip->ip_p)
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{
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fprintf(stderr, "Protocol already set: %d\n",
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ip->ip_p);
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break;
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}
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ip->ip_p = IPPROTO_TCP;
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ip->ip_len += sizeof(tcphdr_t);
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break;
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case 'U' :
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nonl++;
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if (ip->ip_p)
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{
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fprintf(stderr, "Protocol already set: %d\n",
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ip->ip_p);
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break;
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}
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ip->ip_p = IPPROTO_UDP;
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ip->ip_len += sizeof(udphdr_t);
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break;
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case 'd' :
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opts |= OPT_DEBUG;
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break;
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case 'f' :
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nonl++;
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ip->ip_off = strtol(optarg, NULL, 0);
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break;
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case 'g' :
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nonl++;
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gateway = optarg;
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break;
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case 'i' :
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nonl++;
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dev = optarg;
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break;
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case 'm' :
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nonl++;
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mtu = atoi(optarg);
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if (mtu < 28)
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{
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fprintf(stderr, "mtu must be > 28\n");
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exit(1);
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}
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break;
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case 'o' :
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nonl++;
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olen = buildopts(optarg, options, (ip->ip_hl - 5) << 2);
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break;
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case 's' :
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nonl++;
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src = optarg;
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break;
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case 't' :
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nonl++;
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if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
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tcp->th_dport = htons(atoi(optarg));
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break;
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case 'v' :
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opts |= OPT_VERBOSE;
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break;
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case 'w' :
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nonl++;
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if (ip->ip_p == IPPROTO_TCP)
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tcp->th_win = atoi(optarg);
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else
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fprintf(stderr, "set protocol to TCP first\n");
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break;
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default :
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fprintf(stderr, "Unknown option \"%c\"\n", c);
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usage(name);
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}
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if (argc - optind < 1)
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usage(name);
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dst = argv[optind++];
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if (!src)
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{
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gethostname(host, sizeof(host));
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src = host;
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}
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if (resolve(src, (char *)&ip->ip_src) == -1)
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{
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fprintf(stderr,"Cant resolve %s\n", src);
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exit(2);
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}
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if (resolve(dst, (char *)&ip->ip_dst) == -1)
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{
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fprintf(stderr,"Cant resolve %s\n", dst);
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exit(2);
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}
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if (!gateway)
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gwip = ip->ip_dst;
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else if (resolve(gateway, (char *)&gwip) == -1)
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{
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fprintf(stderr,"Cant resolve %s\n", gateway);
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exit(2);
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}
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if (olen)
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{
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caddr_t ipo = (caddr_t)ip;
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printf("Options: %d\n", olen);
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ti = (struct tcpiphdr *)malloc(olen + ip->ip_len);
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bcopy((char *)ip, (char *)ti, sizeof(*ip));
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ip = (ip_t *)ti;
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ip->ip_hl = (olen >> 2);
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bcopy(options, (char *)(ip + 1), olen);
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bcopy((char *)tcp, (char *)(ip + 1) + olen, sizeof(*tcp));
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ip->ip_len += olen;
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bcopy((char *)ip, (char *)ipo, ip->ip_len);
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ip = (ip_t *)ipo;
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tcp = (tcphdr_t *)((char *)(ip + 1) + olen);
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}
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if (ip->ip_p == IPPROTO_TCP)
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for (s = argv[optind]; s && (c = *s); s++)
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switch(c)
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{
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case 'S' : case 's' :
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tcp->th_flags |= TH_SYN;
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break;
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case 'A' : case 'a' :
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tcp->th_flags |= TH_ACK;
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break;
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case 'F' : case 'f' :
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tcp->th_flags |= TH_FIN;
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break;
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case 'R' : case 'r' :
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tcp->th_flags |= TH_RST;
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break;
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case 'P' : case 'p' :
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tcp->th_flags |= TH_PUSH;
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break;
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case 'U' : case 'u' :
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tcp->th_flags |= TH_URG;
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break;
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}
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if (!dev)
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dev = default_device;
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printf("Device: %s\n", dev);
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printf("Source: %s\n", inet_ntoa(ip->ip_src));
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printf("Dest: %s\n", inet_ntoa(ip->ip_dst));
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printf("Gateway: %s\n", inet_ntoa(gwip));
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if (ip->ip_p == IPPROTO_TCP && tcp->th_flags)
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printf("Flags: %#x\n", tcp->th_flags);
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printf("mtu: %d\n", mtu);
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#ifdef DOSOCKET
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if (tcp->th_dport)
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return do_socket(dev, mtu, ti, gwip);
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#endif
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return send_packets(dev, mtu, (ip_t *)ti, gwip);
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}
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