3 * An evil proxy for TrIPE
5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Trivial IP Encryption (TrIPE).
12 * TrIPE is free software: you can redistribute it and/or modify it under
13 * the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 3 of the License, or (at your
15 * option) any later version.
17 * TrIPE is distributed in the hope that it will be useful, but WITHOUT
18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 * You should have received a copy of the GNU General Public License
23 * along with TrIPE. If not, see <https://www.gnu.org/licenses/>.
26 /*----- Header files ------------------------------------------------------*/
37 #include <sys/types.h>
42 #include <sys/socket.h>
43 #include <netinet/in.h>
44 #include <arpa/inet.h>
47 #include <mLib/alloc.h>
48 #include <mLib/dstr.h>
49 #include <mLib/fdflags.h>
50 #include <mLib/mdwopt.h>
51 #include <mLib/quis.h>
52 #include <mLib/report.h>
57 #include <catacomb/buf.h>
59 #include <catacomb/key.h>
61 #include <catacomb/mp.h>
62 #include <catacomb/mprand.h>
63 #include <catacomb/dh.h>
65 #include <catacomb/noise.h>
66 #include <catacomb/rand.h>
67 #include <catacomb/rc4.h>
71 /*----- Data structures ---------------------------------------------------*/
80 typedef struct filter
{
83 void (*func
)(struct filter */
*f*/
, const octet */
*buf*/
, size_t /*sz*/);
87 typedef struct qnode
{
92 /*----- Static variables --------------------------------------------------*/
98 static unsigned npeer
= 0;
102 #define PASS(f, buf, sz) ((f) ? (f)->func((f), (buf), (sz)) : (void)0)
103 #define RND(i) (rng->ops->range(rng, (i)))
105 /*----- Peer management ---------------------------------------------------*/
107 static void dopacket(int fd
, unsigned mode
, void *vv
)
111 int r
= read(fd
, buf
, sizeof(buf
));
113 printf("recv from `%s'\n", p
->name
);
118 static void addpeer(unsigned ac
, char **av
)
120 key_packstruct kps
[DH_PUBFETCHSZ
];
123 struct sockaddr_in sin
;
130 die(1, "syntax: peer:NAME:PORT:ADDR:PORT");
132 die(1, "enough peers already");
134 p
->name
= xstrdup(av
[0]);
135 kp
= key_fetchinit(dh_pubfetch
, kps
, &p
->kpub
);
136 e
= key_fetchbyname(kp
, &keys
, av
[0]);
139 die(1, "key_fetch `%s': %s", av
[0], key_strerror(e
));
140 if ((fd
= socket(PF_INET
, SOCK_DGRAM
, 0)) < 0)
141 die(1, "socket: %s", strerror(errno
));
142 fdflags(fd
, O_NONBLOCK
, O_NONBLOCK
, FD_CLOEXEC
, FD_CLOEXEC
);
143 memset(&sin
, 0, sizeof(sin
));
144 sin
.sin_family
= AF_INET
;
145 sin
.sin_addr
.s_addr
= INADDR_ANY
;
146 sin
.sin_port
= htons(atoi(av
[1]));
147 if (bind(fd
, (struct sockaddr
*)&sin
, sizeof(sin
)))
148 die(1, "bind: %s", strerror(errno
));
149 memset(&sin
, 0, sizeof(sin
));
150 sin
.sin_family
= AF_INET
;
151 if ((h
= gethostbyname(av
[2])) == 0)
152 die(1, "gethostbyname `%s'", av
[2]);
153 if (setsockopt(fd
, SOL_SOCKET
, SO_RCVBUF
, &len
, sizeof(len
)) ||
154 setsockopt(fd
, SOL_SOCKET
, SO_SNDBUF
, &len
, sizeof(len
)))
155 die(1, "setsockopt: %s", strerror(errno
));
156 memcpy(&sin
.sin_addr
, h
->h_addr
, sizeof(sin
.sin_addr
));
157 sin
.sin_port
= htons(atoi(av
[3]));
158 if (connect(fd
, (struct sockaddr
*)&sin
, sizeof(sin
)))
159 die(1, "connect: %s", strerror(errno
));
160 sel_initfile(&sel
, &p
->sf
, fd
, SEL_READ
, dopacket
, p
);
164 /*----- Fork filter -------------------------------------------------------*/
166 typedef struct forknode
{
167 struct forknode
*next
;
171 typedef struct forkfilt
{
176 static void dofork(filter
*f
, const octet
*buf
, size_t sz
)
178 forkfilt
*ff
= f
->state
;
183 for (fn
= ff
->fn
; fn
; fn
= fn
->next
) {
184 printf("fork branch %u of fork `%s'\n", i
++, ff
->name
);
185 PASS(fn
->f
, buf
, sz
);
187 printf("fork branch %u of fork `%s'\n", i
++, ff
->name
);
188 PASS(f
->next
, buf
, sz
);
191 static void addfork(filter
*f
, unsigned ac
, char **av
)
195 die(1, "syntax: filt:fork:NAME");
196 ff
= CREATE(forkfilt
);
197 ff
->name
= xstrdup(av
[0]);
203 static void nextfork(unsigned ac
, char **av
)
212 die(1, "syntax: next:NAME:...");
213 for (i
= 0; i
< 2; i
++) {
215 for (f
= p
->f
; f
; f
= f
->next
) {
216 if (f
->func
!= dofork
)
219 for (j
= 0; j
< ac
; j
++) {
220 if (strcmp(av
[j
], ff
->name
) == 0)
225 fn
= CREATE(forknode
);
226 for (ffn
= &ff
->fn
; *ffn
; ffn
= &(*ffn
)->next
)
236 /*----- Corrupt filter ----------------------------------------------------*/
238 typedef struct corrupt
{
242 static void docorrupt(filter
*f
, const octet
*buf
, size_t sz
)
244 corrupt
*c
= f
->state
;
248 while (!RND(c
->p_corrupt
)) {
249 puts("corrupt packet");
250 b
[RND(sz
)] ^= RND(256);
252 PASS(f
->next
, b
, sz
);
255 static void addcorrupt(filter
*f
, unsigned ac
, char **av
)
259 die(1, "syntax: filt:corrupt[:P-CORRUPT]");
262 c
->p_corrupt
= atoi(av
[0]);
269 /*----- Drop filter -------------------------------------------------------*/
271 typedef struct drop
{
275 static void dodrop(filter
*f
, const octet
*buf
, size_t sz
)
282 PASS(f
->next
, buf
, sz
);
285 static void adddrop(filter
*f
, unsigned ac
, char **av
)
289 die(1, "syntax: filt:drop[:P-DROP]");
292 d
->p_drop
= atoi(av
[0]);
299 /*----- Delay filter ------------------------------------------------------*/
301 typedef struct delaynode
{
311 typedef struct delay
{
319 static void dtimer(struct timeval
*tv
, void *vv
);
321 static void dinsert(delaynode
*dn
)
325 unsigned long tdelta
= RND(dn
->d
->t
);
326 gettimeofday(&tv
, 0);
327 TV_ADDL(&tv
, &tv
, 0, tdelta
);
329 sel_addtimer(&sel
, &dn
->tm
, &tv
, dtimer
, dn
);
331 for (ta
= tb
= sel
.timers
; ta
; ta
= ta
->next
) {
332 ta
= ta
->next
; if (!ta
) break; assert(ta
!= tb
);
333 ta
= ta
->next
; if (!ta
) break; assert(ta
!= tb
);
336 printf(" delay %lu usecs", tdelta
);
339 static void dsend(delaynode
*dn
, unsigned force
)
343 fputs(" send...\n", stdout
);
345 PASS(d
->f
->next
, dn
->buf
, dn
->sz
);
346 fputs("delay ...", stdout
);
355 sel_rmtimer(&ddn
->tm
);
356 sel_addtimer(&sel
, &dn
->tm
, &ddn
->tm
.tv
, dtimer
, dn
);
363 printf(" move id %u from slot %u to slot %u", ddn
->seq
, ddn
->i
, dn
->i
);
365 { unsigned i
; for (i
= 0; i
< d
->n
; i
++) assert(d
->q
[i
].buf
); }
366 fputs(" remove", stdout
);
370 static void dtimer(struct timeval
*tv
, void *vv
)
373 printf("delay timer peer `%s' id %u slot %u",
374 dn
->d
->f
->p_from
->name
, dn
->seq
, dn
->i
);
376 dsend(dn
, RND(dn
->d
->p_replay
));
380 static void dodelay(filter
*f
, const octet
*buf
, size_t sz
)
384 static unsigned seq
= 0;
386 fputs("delay", stdout
);
387 if (d
->n
== d
->max
) {
388 dn
= &d
->q
[RND(d
->n
)];
389 printf(" force uid %u", dn
->seq
);
390 sel_rmtimer(&dn
->tm
);
397 printf(" new id %u in slot %u", dn
->seq
, dn
->i
);
398 dn
->buf
= xmalloc(sz
);
400 memcpy(dn
->buf
, buf
, sz
);
405 static void adddelay(filter
*f
, unsigned ac
, char **av
)
410 if (ac
< 1 || ac
> 3)
411 die(1, "syntax: filt:delay:QLEN[:MILLIS:P-REPLAY]");
413 d
->max
= atoi(av
[0]);
415 d
->t
= strtoul(av
[1], 0, 10);
420 d
->p_replay
= atoi(av
[2]);
424 d
->q
= xmalloc(d
->max
* sizeof(delaynode
));
428 for (i
= 0; i
< d
->max
; i
++) {
436 /*----- Filters -----------------------------------------------------------*/
438 static void dosend(filter
*f
, const octet
*buf
, size_t sz
)
440 printf("send to `%s'\n", f
->p_to
->name
);
441 DISCARD(write(f
->p_to
->sf
.fd
, buf
, sz
));
444 static void addsend(filter
*f
, unsigned ac
, char **av
)
447 die(1, "syntax: filt:send");
451 const struct filtab
{
453 void (*func
)(filter */
*f*/
, unsigned /*ac*/, char **/
*av*/
);
457 { "delay", adddelay
},
459 { "corrupt", addcorrupt
},
463 static void dofilter(peer
*from
, peer
*to
, unsigned ac
, char **av
)
465 filter
**ff
, *f
= CREATE(filter
);
466 const struct filtab
*ft
;
468 die(1, "syntax: {l,r,}filt:NAME:...");
473 for (ff
= &from
->f
; *ff
; ff
= &(*ff
)->next
)
476 for (ft
= filtab
; ft
->name
; ft
++) {
477 if (strcmp(av
[0], ft
->name
) == 0) {
478 ft
->func(f
, ac
- 1, av
+ 1);
482 die(1, "unknown filter `%s'", av
[0]);
485 /*----- Flooding ----------------------------------------------------------*/
487 typedef struct flood
{
495 static void setflood(flood
*f
);
497 static void floodtimer(struct timeval
*tv
, void *vv
)
509 rng
->ops
->fill(rng
, buf
, sz
);
512 puts("flood packet");
513 PASS(f
->p
->f
, buf
, sz
);
517 static void setflood(flood
*f
)
520 gettimeofday(&tv
, 0);
521 TV_ADDL(&tv
, &tv
, 0, RND(f
->t
));
522 sel_addtimer(&sel
, &f
->tm
, &tv
, floodtimer
, f
);
525 static void doflood(peer
*p
, unsigned ac
, char **av
)
529 die(1, "syntax: flood[:TYPE:MILLIS:SIZE]");
533 f
->type
= strtoul(av
[0], 0, 16);
548 /*----- Configuration commands --------------------------------------------*/
550 static void parse(char *p
);
552 static void addflood(unsigned ac
, char **av
) {
553 doflood(&peers
[0], ac
, av
);
554 doflood(&peers
[1], ac
, av
);
556 static void addlflood(unsigned ac
, char **av
) {
557 doflood(&peers
[0], ac
, av
);
559 static void addrflood(unsigned ac
, char **av
) {
560 doflood(&peers
[1], ac
, av
);
563 static void addfilter(unsigned ac
, char **av
) {
564 dofilter(&peers
[0], &peers
[1], ac
, av
);
565 dofilter(&peers
[1], &peers
[0], ac
, av
);
567 static void addlfilter(unsigned ac
, char **av
) {
568 dofilter(&peers
[0], &peers
[1], ac
, av
);
570 static void addrfilter(unsigned ac
, char **av
) {
571 dofilter(&peers
[1], &peers
[0], ac
, av
);
574 static void include(unsigned ac
, char **av
)
579 die(1, "syntax: include:FILE:...");
581 if ((fp
= fopen(*av
, "r")) == 0)
582 die(1, "fopen `%s': %s", *av
, strerror(errno
));
583 while (dstr_putline(&d
, fp
) != EOF
) {
592 const struct cmdtab
{
594 void (*func
)(unsigned /*ac*/, char **/
*av*/
);
597 { "include", include
},
598 { "filt", addfilter
},
599 { "lfilt", addlfilter
},
600 { "rfilt", addrfilter
},
601 { "next", nextfork
},
602 { "flood", addflood
},
603 { "lflood", addlflood
},
604 { "rflood", addrflood
},
610 static void parse(char *p
)
614 const struct cmdtab
*ct
;
622 } while (p
&& c
< AVMAX
- 1);
624 for (ct
= cmdtab
; ct
->name
; ct
++) {
625 if (strcmp(ct
->name
, v
[0]) == 0) {
626 ct
->func(c
- 1, v
+ 1);
630 die(1, "unknown command `%s'", v
[0]);
633 /*----- Main driver -------------------------------------------------------*/
635 static void version(FILE *fp
)
636 { pquis(fp
, "$, TrIPE version " VERSION
"\n"); }
638 static void usage(FILE *fp
)
639 { pquis(fp
, "Usage: $ [-k KEYRING] DIRECTIVE...\n"); }
641 static void help(FILE *fp
)
649 -h, --help Show this help text.\n\
650 -v, --version Show the version number.\n\
651 -u, --usage Show terse usage summary.\n\
653 -k, --keyring=FILE Fetch keys from FILE.\n\
656 peer:NAME:LOCAL-PORT:REMOTE-ADDR:REMOTE-PORT\n\
658 {,l,r}filt:FILTER:ARGS:...\n\
660 {,l,r}flood:TYPE:MILLIS:SIZE\n\
665 delay:QLEN[:MILLIS:P-REPLAY]\n\
667 corrupt[:P-CORRUPT]\n",
671 int main(int argc
, char *argv
[])
673 const char *kfname
= "keyring.pub";
682 static const struct option opt
[] = {
683 { "help", 0, 0, 'h' },
684 { "version", 0, 0, 'v' },
685 { "usage", 0, 0, 'u' },
686 { "keyring", OPTF_ARGREQ
, 0, 'k' },
689 if ((i
= mdwopt(argc
, argv
, "hvuk:", opt
, 0, 0, 0)) < 0)
713 rand_noisesrc(RAND_GLOBAL
, &noise_source
);
714 rand_seed(RAND_GLOBAL
, 160);
715 rand_get(RAND_GLOBAL
, buf
, sizeof(buf
));
716 rng
= rc4_rand(buf
, sizeof(buf
));
718 if (key_open(&keys
, kfname
, KOPEN_READ
, key_moan
, 0))
719 die(1, "couldn't open `%s': %s", kfname
, strerror(errno
));
720 for (i
= optind
; i
< argc
; i
++)
723 die(1, "need two peers");
725 if (sel_select(&sel
) && errno
!= EINTR
)
726 die(1, "select failed: %s", strerror(errno
));
732 /*----- That's all, folks -------------------------------------------------*/