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ipsend.c (26119) ipsend.c (31183)
1/*
1/*
2 * ipsend.c (C) 1995 Darren Reed
2 * ipsend.c (C) 1995-1997 Darren Reed
3 *
4 * This was written to test what size TCP fragments would get through
5 * various TCP/IP packet filters, as used in IP firewalls. In certain
6 * conditions, enough of the TCP header is missing for unpredictable
7 * results unless the filter is aware that this can happen.
8 *
3 *
4 * This was written to test what size TCP fragments would get through
5 * various TCP/IP packet filters, as used in IP firewalls. In certain
6 * conditions, enough of the TCP header is missing for unpredictable
7 * results unless the filter is aware that this can happen.
8 *
9 * The author provides this program as-is, with no gaurantee for its
10 * suitability for any specific purpose. The author takes no responsibility
11 * for the misuse/abuse of this program and provides it for the sole purpose
12 * of testing packet filter policies. This file maybe distributed freely
13 * providing it is not modified and that this notice remains in tact.
14 *
15 * This was written and tested (successfully) on SunOS 4.1.x.
9 * Redistribution and use in source and binary forms are permitted
10 * provided that this notice is preserved and due credit is given
11 * to the original author and the contributors.
16 */
12 */
17#if !defined(lint) && defined(LIBC_SCCS)
18static char sccsid[] = "@(#)ipsend.c 1.5 12/10/95 (C)1995 Darren Reed";
13#if !defined(lint)
14static const char sccsid[] = "@(#)ipsend.c 1.5 12/10/95 (C)1995 Darren Reed";
15static const char rcsid[] = "@(#)$Id: ipsend.c,v 2.0.2.19 1997/10/12 09:48:38 darrenr Exp $";
19#endif
20#include <stdio.h>
21#include <stdlib.h>
22#include <unistd.h>
23#include <netdb.h>
24#include <string.h>
25#include <sys/types.h>
26#include <sys/time.h>

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31#include <netinet/ip.h>
32#include <netinet/tcp.h>
33#include <netinet/udp.h>
34#include <netinet/ip_icmp.h>
35#ifndef linux
36#include <netinet/ip_var.h>
37#endif
38#include "ipsend.h"
16#endif
17#include <stdio.h>
18#include <stdlib.h>
19#include <unistd.h>
20#include <netdb.h>
21#include <string.h>
22#include <sys/types.h>
23#include <sys/time.h>

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28#include <netinet/ip.h>
29#include <netinet/tcp.h>
30#include <netinet/udp.h>
31#include <netinet/ip_icmp.h>
32#ifndef linux
33#include <netinet/ip_var.h>
34#endif
35#include "ipsend.h"
36#include "ipf.h"
39
40
41extern char *optarg;
42extern int optind;
37
38
39extern char *optarg;
40extern int optind;
41extern void iplang __P((FILE *));
43
44char options[68];
42
43char options[68];
44int opts;
45#ifdef linux
46char default_device[] = "eth0";
47#else
48# ifdef sun
49char default_device[] = "le0";
50# else
51# ifdef ultrix
52char default_device[] = "ln0";
53# else
54# ifdef __bsdi__
55char default_device[] = "ef0";
56# else
45#ifdef linux
46char default_device[] = "eth0";
47#else
48# ifdef sun
49char default_device[] = "le0";
50# else
51# ifdef ultrix
52char default_device[] = "ln0";
53# else
54# ifdef __bsdi__
55char default_device[] = "ef0";
56# else
57# ifdef __sgi
58char default_device[] = "ec0";
59# else
57char default_device[] = "lan0";
60char default_device[] = "lan0";
61# endif
58# endif
59# endif
60# endif
61#endif
62
63
64static void usage __P((char *));
65static void do_icmp __P((ip_t *, char *));
66int main __P((int, char **));
67
68
69static void usage(prog)
70char *prog;
71{
72 fprintf(stderr, "Usage: %s [options] dest [flags]\n\
73\toptions:\n\
62# endif
63# endif
64# endif
65#endif
66
67
68static void usage __P((char *));
69static void do_icmp __P((ip_t *, char *));
70int main __P((int, char **));
71
72
73static void usage(prog)
74char *prog;
75{
76 fprintf(stderr, "Usage: %s [options] dest [flags]\n\
77\toptions:\n\
74\t\t-d device\tSend out on this device\n\
78\t\t-d\tdebug mode\n\
79\t\t-i device\tSend out on this device\n\
75\t\t-f fragflags\tcan set IP_MF or IP_DF\n\
76\t\t-g gateway\tIP gateway to use if non-local dest.\n\
77\t\t-I code,type[,gw[,dst[,src]]]\tSet ICMP protocol\n\
78\t\t-m mtu\t\tfake MTU to use when sending out\n\
79\t\t-P protocol\tSet protocol by name\n\
80\t\t-s src\t\tsource address for IP packet\n\
81\t\t-T\t\tSet TCP protocol\n\
82\t\t-t port\t\tdestination port\n\
83\t\t-U\t\tSet UDP protocol\n\
80\t\t-f fragflags\tcan set IP_MF or IP_DF\n\
81\t\t-g gateway\tIP gateway to use if non-local dest.\n\
82\t\t-I code,type[,gw[,dst[,src]]]\tSet ICMP protocol\n\
83\t\t-m mtu\t\tfake MTU to use when sending out\n\
84\t\t-P protocol\tSet protocol by name\n\
85\t\t-s src\t\tsource address for IP packet\n\
86\t\t-T\t\tSet TCP protocol\n\
87\t\t-t port\t\tdestination port\n\
88\t\t-U\t\tSet UDP protocol\n\
89\t\t-v\tverbose mode\n\
90\t\t-w <window>\tSet the TCP window size\n\
84", prog);
91", prog);
92 fprintf(stderr, "Usage: %s [-dv] -L <filename>\n\
93\toptions:\n\
94\t\t-d\tdebug mode\n\
95\t\t-L filename\tUse IP language for sending packets\n\
96\t\t-v\tverbose mode\n\
97", prog);
85 exit(1);
86}
87
88
98 exit(1);
99}
100
101
89void do_icmp(ip, args)
102static void do_icmp(ip, args)
90ip_t *ip;
91char *args;
92{
93 struct icmp *ic;
94 char *s;
95
96 ip->ip_p = IPPROTO_ICMP;
97 ip->ip_len += sizeof(*ic);

--- 55 unchanged lines hidden (view full) ---

153 return send_packet(wfd, mtu, ip, gwip);
154}
155
156
157int main(argc, argv)
158int argc;
159char **argv;
160{
103ip_t *ip;
104char *args;
105{
106 struct icmp *ic;
107 char *s;
108
109 ip->ip_p = IPPROTO_ICMP;
110 ip->ip_len += sizeof(*ic);

--- 55 unchanged lines hidden (view full) ---

166 return send_packet(wfd, mtu, ip, gwip);
167}
168
169
170int main(argc, argv)
171int argc;
172char **argv;
173{
174 FILE *langfile = NULL;
161 struct tcpiphdr *ti;
162 struct in_addr gwip;
163 tcphdr_t *tcp;
164 ip_t *ip;
165 char *name = argv[0], host[64], *gateway = NULL, *dev = NULL;
175 struct tcpiphdr *ti;
176 struct in_addr gwip;
177 tcphdr_t *tcp;
178 ip_t *ip;
179 char *name = argv[0], host[64], *gateway = NULL, *dev = NULL;
166 char *src = NULL, *dst, c, *s;
167 int mtu = 1500, olen = 0;
180 char *src = NULL, *dst, *s;
181 int mtu = 1500, olen = 0, c, nonl = 0;
168
169 /*
170 * 65535 is maximum packet size...you never know...
171 */
172 ip = (ip_t *)calloc(1, 65536);
173 ti = (struct tcpiphdr *)ip;
174 tcp = (tcphdr_t *)&ti->ti_sport;
175 ip->ip_len = sizeof(*ip);
176 ip->ip_hl = sizeof(*ip) >> 2;
177
182
183 /*
184 * 65535 is maximum packet size...you never know...
185 */
186 ip = (ip_t *)calloc(1, 65536);
187 ti = (struct tcpiphdr *)ip;
188 tcp = (tcphdr_t *)&ti->ti_sport;
189 ip->ip_len = sizeof(*ip);
190 ip->ip_hl = sizeof(*ip) >> 2;
191
178 while ((c = (char)getopt(argc, argv, "IP:TUd:f:g:m:o:s:t:")) != -1)
192 while ((c = getopt(argc, argv, "I:L:P:TUdf:i:g:m:o:s:t:vw:")) != -1)
179 switch (c)
180 {
181 case 'I' :
193 switch (c)
194 {
195 case 'I' :
196 nonl++;
182 if (ip->ip_p)
183 {
184 fprintf(stderr, "Protocol already set: %d\n",
185 ip->ip_p);
186 break;
187 }
188 do_icmp(ip, optarg);
189 break;
197 if (ip->ip_p)
198 {
199 fprintf(stderr, "Protocol already set: %d\n",
200 ip->ip_p);
201 break;
202 }
203 do_icmp(ip, optarg);
204 break;
205 case 'L' :
206 if (nonl) {
207 fprintf(stderr,
208 "Incorrect usage of -L option.\n");
209 usage(name);
210 }
211 if (!strcmp(optarg, "-"))
212 langfile = stdin;
213 else if (!(langfile = fopen(optarg, "r"))) {
214 fprintf(stderr, "can't open file %s\n",
215 optarg);
216 exit(1);
217 }
218 iplang(langfile);
219 return 0;
190 case 'P' :
191 {
192 struct protoent *p;
193
220 case 'P' :
221 {
222 struct protoent *p;
223
224 nonl++;
194 if (ip->ip_p)
195 {
196 fprintf(stderr, "Protocol already set: %d\n",
197 ip->ip_p);
198 break;
199 }
200 if ((p = getprotobyname(optarg)))
201 ip->ip_p = p->p_proto;
202 else
203 fprintf(stderr, "Unknown protocol: %s\n",
204 optarg);
205 break;
206 }
207 case 'T' :
225 if (ip->ip_p)
226 {
227 fprintf(stderr, "Protocol already set: %d\n",
228 ip->ip_p);
229 break;
230 }
231 if ((p = getprotobyname(optarg)))
232 ip->ip_p = p->p_proto;
233 else
234 fprintf(stderr, "Unknown protocol: %s\n",
235 optarg);
236 break;
237 }
238 case 'T' :
239 nonl++;
208 if (ip->ip_p)
209 {
210 fprintf(stderr, "Protocol already set: %d\n",
211 ip->ip_p);
212 break;
213 }
214 ip->ip_p = IPPROTO_TCP;
215 ip->ip_len += sizeof(tcphdr_t);
216 break;
217 case 'U' :
240 if (ip->ip_p)
241 {
242 fprintf(stderr, "Protocol already set: %d\n",
243 ip->ip_p);
244 break;
245 }
246 ip->ip_p = IPPROTO_TCP;
247 ip->ip_len += sizeof(tcphdr_t);
248 break;
249 case 'U' :
250 nonl++;
218 if (ip->ip_p)
219 {
220 fprintf(stderr, "Protocol already set: %d\n",
221 ip->ip_p);
222 break;
223 }
224 ip->ip_p = IPPROTO_UDP;
225 ip->ip_len += sizeof(udphdr_t);
226 break;
227 case 'd' :
251 if (ip->ip_p)
252 {
253 fprintf(stderr, "Protocol already set: %d\n",
254 ip->ip_p);
255 break;
256 }
257 ip->ip_p = IPPROTO_UDP;
258 ip->ip_len += sizeof(udphdr_t);
259 break;
260 case 'd' :
228 dev = optarg;
261 opts |= OPT_DEBUG;
229 break;
230 case 'f' :
262 break;
263 case 'f' :
264 nonl++;
231 ip->ip_off = strtol(optarg, NULL, 0);
232 break;
233 case 'g' :
265 ip->ip_off = strtol(optarg, NULL, 0);
266 break;
267 case 'g' :
268 nonl++;
234 gateway = optarg;
235 break;
269 gateway = optarg;
270 break;
271 case 'i' :
272 nonl++;
273 dev = optarg;
274 break;
236 case 'm' :
275 case 'm' :
276 nonl++;
237 mtu = atoi(optarg);
238 if (mtu < 28)
239 {
240 fprintf(stderr, "mtu must be > 28\n");
241 exit(1);
242 }
243 break;
244 case 'o' :
277 mtu = atoi(optarg);
278 if (mtu < 28)
279 {
280 fprintf(stderr, "mtu must be > 28\n");
281 exit(1);
282 }
283 break;
284 case 'o' :
245 olen = optname(optarg, options);
285 nonl++;
286 olen = buildopts(optarg, options, (ip->ip_hl - 5) << 2);
246 break;
247 case 's' :
287 break;
288 case 's' :
289 nonl++;
248 src = optarg;
249 break;
250 case 't' :
290 src = optarg;
291 break;
292 case 't' :
293 nonl++;
251 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
252 tcp->th_dport = htons(atoi(optarg));
253 break;
294 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
295 tcp->th_dport = htons(atoi(optarg));
296 break;
297 case 'v' :
298 opts |= OPT_VERBOSE;
299 break;
254 case 'w' :
300 case 'w' :
301 nonl++;
255 if (ip->ip_p == IPPROTO_TCP)
256 tcp->th_win = atoi(optarg);
257 else
258 fprintf(stderr, "set protocol to TCP first\n");
259 break;
260 default :
261 fprintf(stderr, "Unknown option \"%c\"\n", c);
262 usage(name);
263 }
264
302 if (ip->ip_p == IPPROTO_TCP)
303 tcp->th_win = atoi(optarg);
304 else
305 fprintf(stderr, "set protocol to TCP first\n");
306 break;
307 default :
308 fprintf(stderr, "Unknown option \"%c\"\n", c);
309 usage(name);
310 }
311
265 if (argc - optind < 2)
312 if (argc - optind < 1)
266 usage(name);
267 dst = argv[optind++];
268
269 if (!src)
270 {
271 gethostname(host, sizeof(host));
272 src = host;
273 }

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287 if (!gateway)
288 gwip = ip->ip_dst;
289 else if (resolve(gateway, (char *)&gwip) == -1)
290 {
291 fprintf(stderr,"Cant resolve %s\n", gateway);
292 exit(2);
293 }
294
313 usage(name);
314 dst = argv[optind++];
315
316 if (!src)
317 {
318 gethostname(host, sizeof(host));
319 src = host;
320 }

--- 13 unchanged lines hidden (view full) ---

334 if (!gateway)
335 gwip = ip->ip_dst;
336 else if (resolve(gateway, (char *)&gwip) == -1)
337 {
338 fprintf(stderr,"Cant resolve %s\n", gateway);
339 exit(2);
340 }
341
342 if (olen)
343 {
344 caddr_t ipo = (caddr_t)ip;
345
346 printf("Options: %d\n", olen);
347 ti = (struct tcpiphdr *)malloc(olen + ip->ip_len);
348 bcopy((char *)ip, (char *)ti, sizeof(*ip));
349 ip = (ip_t *)ti;
350 ip->ip_hl = (olen >> 2);
351 bcopy(options, (char *)(ip + 1), olen);
352 bcopy((char *)tcp, (char *)(ip + 1) + olen, sizeof(*tcp));
353 ip->ip_len += olen;
354 bcopy((char *)ip, (char *)ipo, ip->ip_len);
355 ip = (ip_t *)ipo;
356 tcp = (tcphdr_t *)((char *)(ip + 1) + olen);
357 }
358
295 if (ip->ip_p == IPPROTO_TCP)
296 for (s = argv[optind]; (c = *s); s++)
297 switch(c)
298 {
299 case 'S' : case 's' :
300 tcp->th_flags |= TH_SYN;
301 break;
302 case 'A' : case 'a' :

--- 18 unchanged lines hidden (view full) ---

321 printf("Device: %s\n", dev);
322 printf("Source: %s\n", inet_ntoa(ip->ip_src));
323 printf("Dest: %s\n", inet_ntoa(ip->ip_dst));
324 printf("Gateway: %s\n", inet_ntoa(gwip));
325 if (ip->ip_p == IPPROTO_TCP && tcp->th_flags)
326 printf("Flags: %#x\n", tcp->th_flags);
327 printf("mtu: %d\n", mtu);
328
359 if (ip->ip_p == IPPROTO_TCP)
360 for (s = argv[optind]; (c = *s); s++)
361 switch(c)
362 {
363 case 'S' : case 's' :
364 tcp->th_flags |= TH_SYN;
365 break;
366 case 'A' : case 'a' :

--- 18 unchanged lines hidden (view full) ---

385 printf("Device: %s\n", dev);
386 printf("Source: %s\n", inet_ntoa(ip->ip_src));
387 printf("Dest: %s\n", inet_ntoa(ip->ip_dst));
388 printf("Gateway: %s\n", inet_ntoa(gwip));
389 if (ip->ip_p == IPPROTO_TCP && tcp->th_flags)
390 printf("Flags: %#x\n", tcp->th_flags);
391 printf("mtu: %d\n", mtu);
392
329 if (olen)
330 {
331 printf("Options: %d\n", olen);
332 ti = (struct tcpiphdr *)malloc(olen + ip->ip_len);
333 bcopy((char *)ip, (char *)ti, sizeof(*ip));
334 ip = (ip_t *)ti;
335 ip->ip_hl += (olen >> 2);
336 bcopy(options, (char *)(ip + 1), olen);
337 bcopy((char *)tcp, (char *)(ip + 1) + olen, sizeof(*tcp));
338 tcp = (tcphdr_t *)((char *)(ip + 1) + olen);
339 ip->ip_len += olen;
340 }
341
342#ifdef DOSOCKET
343 if (tcp->th_dport)
344 return do_socket(dev, mtu, ti, gwip);
345#endif
346 return send_packets(dev, mtu, (ip_t *)ti, gwip);
347}
393#ifdef DOSOCKET
394 if (tcp->th_dport)
395 return do_socket(dev, mtu, ti, gwip);
396#endif
397 return send_packets(dev, mtu, (ip_t *)ti, gwip);
398}