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/chacha20.h>
66 #include <catacomb/noise.h>
67 #include <catacomb/rand.h>
71 /*----- Data structures ---------------------------------------------------*/
79 typedef struct filter
{
82 void (*func
)(struct filter */
*f*/
, const octet */
*buf*/
, size_t /*sz*/);
86 typedef struct qnode
{
91 /*----- Static variables --------------------------------------------------*/
97 static unsigned npeer
= 0;
100 static const char *delim
= ":";
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_common(const char *cmd
, int af
, unsigned ac
, char **av
)
120 struct addrinfo aihint
= { 0 }, *ai0
, *ai1
;
121 int len
= PKBUFSZ
, yes
= 1;
126 if (ac
!= 4) die(1, "syntax: %s:NAME:PORT:ADDR:PORT", cmd
);
127 if (!key_bytag(&keys
, av
[0])) die(1, "no key named `%s'", av
[0]);
129 p
->name
= xstrdup(av
[0]);
130 aihint
.ai_family
= af
;
131 aihint
.ai_socktype
= SOCK_DGRAM
;
132 aihint
.ai_flags
= AI_ADDRCONFIG
;
133 if ((err
= getaddrinfo(av
[2], av
[3], &aihint
, &ai1
)) != 0)
134 die(1, "getaddrinfo(`%s', `%s'): %s", av
[2], av
[3], gai_strerror(err
));
135 aihint
.ai_family
= ai1
->ai_family
;
136 aihint
.ai_flags
= AI_ADDRCONFIG
| AI_PASSIVE
;
137 if ((err
= getaddrinfo(0, av
[1], &aihint
, &ai0
)) != 0)
138 die(1, "getaddrinfo(passive, `%s'): %s", av
[1], gai_strerror(err
));
139 if ((fd
= socket(ai1
->ai_family
, SOCK_DGRAM
, ai1
->ai_protocol
)) < 0)
140 die(1, "socket: %s", strerror(errno
));
141 if (ai1
->ai_family
== AF_INET6
) {
142 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_V6ONLY
, &yes
, sizeof(yes
)))
143 die(1, "setsockopt: %s", strerror(errno
));
145 if (bind(fd
, ai0
->ai_addr
, ai0
->ai_addrlen
))
146 die(1, "bind: %s", strerror(errno
));
147 if (setsockopt(fd
, SOL_SOCKET
, SO_RCVBUF
, &len
, sizeof(len
)) ||
148 setsockopt(fd
, SOL_SOCKET
, SO_SNDBUF
, &len
, sizeof(len
)))
149 die(1, "setsockopt: %s", strerror(errno
));
150 if (connect(fd
, ai1
->ai_addr
, ai1
->ai_addrlen
))
151 die(1, "connect: %s", strerror(errno
));
152 sel_initfile(&sel
, &p
->sf
, fd
, SEL_READ
, dopacket
, p
);
154 freeaddrinfo(ai0
); freeaddrinfo(ai1
);
157 static void addpeer(unsigned ac
, char **av
)
158 { addpeer_common("peer", AF_UNSPEC
, ac
, av
); }
159 static void addpeer4(unsigned ac
, char **av
)
160 { addpeer_common("peer4", AF_INET
, ac
, av
); }
161 static void addpeer6(unsigned ac
, char **av
)
162 { addpeer_common("peer6", AF_INET6
, ac
, av
); }
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
)
194 if (ac
!= 1) die(1, "syntax: filt:fork:NAME");
195 ff
= CREATE(forkfilt
);
196 ff
->name
= xstrdup(av
[0]);
202 static void nextfork(unsigned ac
, char **av
)
210 if (ac
< 1) die(1, "syntax: next:NAME:...");
211 for (i
= 0; i
< 2; i
++) {
213 for (f
= p
->f
; f
; f
= f
->next
) {
214 if (f
->func
!= dofork
) continue;
216 for (j
= 0; j
< ac
; j
++)
217 if (strcmp(av
[j
], ff
->name
) == 0) goto match
;
220 fn
= CREATE(forknode
);
221 for (ffn
= &ff
->fn
; *ffn
; ffn
= &(*ffn
)->next
);
230 /*----- Corrupt filter ----------------------------------------------------*/
232 typedef struct corrupt
{
236 static void docorrupt(filter
*f
, const octet
*buf
, size_t sz
)
238 corrupt
*c
= f
->state
;
242 while (!RND(c
->p_corrupt
)) {
243 puts("corrupt packet");
244 b
[RND(sz
)] ^= RND(256);
246 PASS(f
->next
, b
, sz
);
249 static void addcorrupt(filter
*f
, unsigned ac
, char **av
)
252 if (ac
> 1) die(1, "syntax: filt:corrupt[:P-CORRUPT]");
254 if (ac
> 0) c
->p_corrupt
= atoi(av
[0]);
255 else c
->p_corrupt
= 5;
260 /*----- Drop filter -------------------------------------------------------*/
262 typedef struct drop
{
266 static void dodrop(filter
*f
, const octet
*buf
, size_t sz
)
270 if (!RND(d
->p_drop
)) puts("drop packet");
271 else PASS(f
->next
, buf
, sz
);
274 static void adddrop(filter
*f
, unsigned ac
, char **av
)
277 if (ac
> 1) die(1, "syntax: filt:drop[:P-DROP]");
279 if (ac
> 0) d
->p_drop
= atoi(av
[0]);
285 /*----- Delay filter ------------------------------------------------------*/
287 typedef struct delaynode
{
297 typedef struct delay
{
305 static void dtimer(struct timeval
*tv
, void *vv
);
307 static void dinsert(delaynode
*dn
)
311 unsigned long tdelta
= RND(dn
->d
->t
);
312 gettimeofday(&tv
, 0);
313 TV_ADDL(&tv
, &tv
, 0, tdelta
);
315 sel_addtimer(&sel
, &dn
->tm
, &tv
, dtimer
, dn
);
317 for (ta
= tb
= sel
.timers
; ta
; ta
= ta
->next
) {
318 ta
= ta
->next
; if (!ta
) break; assert(ta
!= tb
);
319 ta
= ta
->next
; if (!ta
) break; assert(ta
!= tb
);
322 printf(" delay %lu usecs", tdelta
);
325 static void dsend(delaynode
*dn
, unsigned force
)
331 fputs(" send...\n", stdout
);
333 PASS(d
->f
->next
, dn
->buf
, dn
->sz
);
334 fputs("delay ...", stdout
);
343 sel_rmtimer(&ddn
->tm
);
344 sel_addtimer(&sel
, &dn
->tm
, &ddn
->tm
.tv
, dtimer
, dn
);
351 printf(" move id %u from slot %u to slot %u", ddn
->seq
, ddn
->i
, dn
->i
);
353 for (i
= 0; i
< d
->n
; i
++) assert(d
->q
[i
].buf
);
354 fputs(" remove", stdout
);
358 static void dtimer(struct timeval
*tv
, void *vv
)
361 printf("delay timer peer `%s' id %u slot %u",
362 dn
->d
->f
->p_from
->name
, dn
->seq
, dn
->i
);
364 dsend(dn
, RND(dn
->d
->p_replay
));
368 static void dodelay(filter
*f
, const octet
*buf
, size_t sz
)
372 static unsigned seq
= 0;
374 fputs("delay", stdout
);
375 if (d
->n
== d
->max
) {
376 dn
= &d
->q
[RND(d
->n
)];
377 printf(" force uid %u", dn
->seq
);
378 sel_rmtimer(&dn
->tm
);
385 printf(" new id %u in slot %u", dn
->seq
, dn
->i
);
386 dn
->buf
= xmalloc(sz
);
388 memcpy(dn
->buf
, buf
, sz
);
393 static void adddelay(filter
*f
, unsigned ac
, char **av
)
398 if (ac
< 1 || ac
> 3) die(1, "syntax: filt:delay:QLEN[:MILLIS:P-REPLAY]");
400 d
->max
= atoi(av
[0]);
401 if (ac
> 1) d
->t
= strtoul(av
[1], 0, 10);
404 if (ac
> 2) d
->p_replay
= atoi(av
[2]);
405 else d
->p_replay
= 20;
407 d
->q
= xmalloc(d
->max
* sizeof(delaynode
));
411 for (i
= 0; i
< d
->max
; i
++) {
419 /*----- Filters -----------------------------------------------------------*/
421 static void dosend(filter
*f
, const octet
*buf
, size_t sz
)
423 printf("send to `%s'\n", f
->p_to
->name
);
424 DISCARD(write(f
->p_to
->sf
.fd
, buf
, sz
));
427 static void addsend(filter
*f
, unsigned ac
, char **av
)
429 if (ac
) die(1, "syntax: filt:send");
433 const struct filtab
{
435 void (*func
)(filter */
*f*/
, unsigned /*ac*/, char **/
*av*/
);
439 { "delay", adddelay
},
441 { "corrupt", addcorrupt
},
445 static void dofilter(peer
*from
, peer
*to
, unsigned ac
, char **av
)
447 filter
**ff
, *f
= CREATE(filter
);
448 const struct filtab
*ft
;
449 if (ac
< 1) die(1, "syntax: {l,r,}filt:NAME:...");
454 for (ff
= &from
->f
; *ff
; ff
= &(*ff
)->next
);
456 for (ft
= filtab
; ft
->name
; ft
++)
457 if (strcmp(av
[0], ft
->name
) == 0)
458 { ft
->func(f
, ac
- 1, av
+ 1); return; }
459 die(1, "unknown filter `%s'", av
[0]);
462 /*----- Flooding ----------------------------------------------------------*/
464 typedef struct flood
{
472 static void setflood(flood
*f
);
474 static void floodtimer(struct timeval
*tv
, void *vv
)
486 rng
->ops
->fill(rng
, buf
, sz
);
487 if (f
->type
< 0x100) buf
[0] = f
->type
;
488 puts("flood packet");
489 PASS(f
->p
->f
, buf
, sz
);
493 static void setflood(flood
*f
)
496 gettimeofday(&tv
, 0);
497 TV_ADDL(&tv
, &tv
, 0, RND(f
->t
));
498 sel_addtimer(&sel
, &f
->tm
, &tv
, floodtimer
, f
);
501 static void doflood(peer
*p
, unsigned ac
, char **av
)
504 if (ac
> 3) die(1, "syntax: flood[:TYPE:MILLIS:SIZE]");
507 if (ac
> 0) f
->type
= strtoul(av
[0], 0, 16);
508 else f
->type
= 0x100;
509 if (ac
> 1) f
->t
= atoi(av
[1]);
511 if (ac
> 2) f
->sz
= atoi(av
[2]);
517 /*----- Configuration commands --------------------------------------------*/
519 static void parse(char *p
);
521 static void addflood(unsigned ac
, char **av
) {
522 doflood(&peers
[0], ac
, av
);
523 doflood(&peers
[1], ac
, av
);
525 static void addlflood(unsigned ac
, char **av
) {
526 doflood(&peers
[0], ac
, av
);
528 static void addrflood(unsigned ac
, char **av
) {
529 doflood(&peers
[1], ac
, av
);
532 static void addfilter(unsigned ac
, char **av
) {
533 dofilter(&peers
[0], &peers
[1], ac
, av
);
534 dofilter(&peers
[1], &peers
[0], ac
, av
);
536 static void addlfilter(unsigned ac
, char **av
) {
537 dofilter(&peers
[0], &peers
[1], ac
, av
);
539 static void addrfilter(unsigned ac
, char **av
) {
540 dofilter(&peers
[1], &peers
[0], ac
, av
);
543 static void include(unsigned ac
, char **av
)
547 if (!ac
) die(1, "syntax: include:FILE:...");
549 if ((fp
= fopen(*av
, "r")) == 0)
550 die(1, "fopen `%s': %s", *av
, strerror(errno
));
551 while (dstr_putline(&d
, fp
) != EOF
) { parse(d
.buf
); DRESET(&d
); }
557 const struct cmdtab
{
559 void (*func
)(unsigned /*ac*/, char **/
*av*/
);
562 { "peer4", addpeer4
},
563 { "peer6", addpeer6
},
564 { "include", include
},
565 { "filt", addfilter
},
566 { "lfilt", addlfilter
},
567 { "rfilt", addrfilter
},
568 { "next", nextfork
},
569 { "flood", addflood
},
570 { "lflood", addlflood
},
571 { "rflood", addrflood
},
577 static void parse(char *p
)
581 const struct cmdtab
*ct
;
583 p
= strtok(p
, delim
);
584 if (!p
|| *p
== '#') return;
587 p
= strtok(0, delim
);
588 } while (p
&& c
< AVMAX
- 1);
590 for (ct
= cmdtab
; ct
->name
; ct
++) {
591 if (strcmp(ct
->name
, v
[0]) == 0) {
592 ct
->func(c
- 1, v
+ 1);
596 die(1, "unknown command `%s'", v
[0]);
599 /*----- Main driver -------------------------------------------------------*/
601 static void version(FILE *fp
)
602 { pquis(fp
, "$, TrIPE version " VERSION
"\n"); }
604 static void usage(FILE *fp
)
605 { pquis(fp
, "Usage: $ [-d CHAR] [-k KEYRING] DIRECTIVE...\n"); }
607 static void help(FILE *fp
)
615 -h, --help Show this help text.\n\
616 -v, --version Show the version number.\n\
617 -u, --usage Show terse usage summary.\n\
619 -d, --delimiter=CHAR Use CHAR rather than `:' as delimiter.\n\
620 -k, --keyring=FILE Fetch keys from FILE.\n\
623 peer{,4,6}:NAME:LOCAL-PORT:REMOTE-ADDR:REMOTE-PORT\n\
625 {,l,r}filt:FILTER:ARGS:...\n\
627 {,l,r}flood:TYPE:MILLIS:SIZE\n\
632 delay:QLEN[:MILLIS:P-REPLAY]\n\
634 corrupt[:P-CORRUPT]\n",
638 int main(int argc
, char *argv
[])
640 const char *kfname
= "keyring.pub";
644 static octet zero
[CHACHA_NONCESZ
];
650 static const struct option opt
[] = {
651 { "help", 0, 0, 'h' },
652 { "version", 0, 0, 'v' },
653 { "usage", 0, 0, 'u' },
654 { "delimiter", OPTF_ARGREQ
, 0, 'd' },
655 { "keyring", OPTF_ARGREQ
, 0, 'k' },
658 if ((i
= mdwopt(argc
, argv
, "hvud:k:", opt
, 0, 0, 0)) < 0) break;
660 case 'h': help(stdout
); exit(0);
661 case 'v': version(stdout
); exit(0);
662 case 'u': usage(stdout
); exit(0);
664 if (!optarg
[0] || optarg
[1])
665 die(1, "delimiter must be a single character");
668 case 'k': kfname
= optarg
; break;
669 default: f
|= f_bogus
; break;
672 if (f
& f_bogus
) { usage(stderr
); exit(1); }
674 rand_noisesrc(RAND_GLOBAL
, &noise_source
);
675 rand_seed(RAND_GLOBAL
, 256);
676 rand_get(RAND_GLOBAL
, buf
, sizeof(buf
));
677 rng
= chacha20_rand(buf
, sizeof(buf
), zero
);
679 if (key_open(&keys
, kfname
, KOPEN_READ
, key_moan
, 0))
680 die(1, "couldn't open `%s': %s", kfname
, strerror(errno
));
681 for (i
= optind
; i
< argc
; i
++) parse(argv
[i
]);
682 if (npeer
!= 2) die(1, "need two peers");
684 if (sel_select(&sel
) && errno
!= EINTR
)
685 die(1, "select failed: %s", strerror(errno
));
691 /*----- That's all, folks -------------------------------------------------*/