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 ---------------------------------------------------*/
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;
101 #define PASS(f, buf, sz) ((f) ? (f)->func((f), (buf), (sz)) : (void)0)
102 #define RND(i) (rng->ops->range(rng, (i)))
104 /*----- Peer management ---------------------------------------------------*/
106 static void dopacket(int fd, unsigned mode, void *vv)
110 int r = read(fd, buf, sizeof(buf));
112 printf("recv from `%s'\n", p->name);
117 static void addpeer(unsigned ac, char **av)
120 struct sockaddr_in sin;
126 die(1, "syntax: peer:NAME:PORT:ADDR:PORT");
128 die(1, "enough peers already");
129 if (!key_bytag(&keys, av[0]))
130 die(1, "no key named `%s'", av[0]);
132 p->name = xstrdup(av[0]);
133 if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
134 die(1, "socket: %s", strerror(errno));
135 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
136 memset(&sin, 0, sizeof(sin));
137 sin.sin_family = AF_INET;
138 sin.sin_addr.s_addr = INADDR_ANY;
139 sin.sin_port = htons(atoi(av[1]));
140 if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)))
141 die(1, "bind: %s", strerror(errno));
142 memset(&sin, 0, sizeof(sin));
143 sin.sin_family = AF_INET;
144 if ((h = gethostbyname(av[2])) == 0)
145 die(1, "gethostbyname `%s'", av[2]);
146 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)) ||
147 setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &len, sizeof(len)))
148 die(1, "setsockopt: %s", strerror(errno));
149 memcpy(&sin.sin_addr, h->h_addr, sizeof(sin.sin_addr));
150 sin.sin_port = htons(atoi(av[3]));
151 if (connect(fd, (struct sockaddr *)&sin, sizeof(sin)))
152 die(1, "connect: %s", strerror(errno));
153 sel_initfile(&sel, &p->sf, fd, SEL_READ, dopacket, p);
157 /*----- Fork filter -------------------------------------------------------*/
159 typedef struct forknode {
160 struct forknode *next;
164 typedef struct forkfilt {
169 static void dofork(filter *f, const octet *buf, size_t sz)
171 forkfilt *ff = f->state;
176 for (fn = ff->fn; fn; fn = fn->next) {
177 printf("fork branch %u of fork `%s'\n", i++, ff->name);
178 PASS(fn->f, buf, sz);
180 printf("fork branch %u of fork `%s'\n", i++, ff->name);
181 PASS(f->next, buf, sz);
184 static void addfork(filter *f, unsigned ac, char **av)
188 die(1, "syntax: filt:fork:NAME");
189 ff = CREATE(forkfilt);
190 ff->name = xstrdup(av[0]);
196 static void nextfork(unsigned ac, char **av)
205 die(1, "syntax: next:NAME:...");
206 for (i = 0; i < 2; i++) {
208 for (f = p->f; f; f = f->next) {
209 if (f->func != dofork)
212 for (j = 0; j < ac; j++) {
213 if (strcmp(av[j], ff->name) == 0)
218 fn = CREATE(forknode);
219 for (ffn = &ff->fn; *ffn; ffn = &(*ffn)->next)
229 /*----- Corrupt filter ----------------------------------------------------*/
231 typedef struct corrupt {
235 static void docorrupt(filter *f, const octet *buf, size_t sz)
237 corrupt *c = f->state;
241 while (!RND(c->p_corrupt)) {
242 puts("corrupt packet");
243 b[RND(sz)] ^= RND(256);
245 PASS(f->next, b, sz);
248 static void addcorrupt(filter *f, unsigned ac, char **av)
252 die(1, "syntax: filt:corrupt[:P-CORRUPT]");
255 c->p_corrupt = atoi(av[0]);
262 /*----- Drop filter -------------------------------------------------------*/
264 typedef struct drop {
268 static void dodrop(filter *f, const octet *buf, size_t sz)
275 PASS(f->next, buf, sz);
278 static void adddrop(filter *f, unsigned ac, char **av)
282 die(1, "syntax: filt:drop[:P-DROP]");
285 d->p_drop = atoi(av[0]);
292 /*----- Delay filter ------------------------------------------------------*/
294 typedef struct delaynode {
304 typedef struct delay {
312 static void dtimer(struct timeval *tv, void *vv);
314 static void dinsert(delaynode *dn)
318 unsigned long tdelta = RND(dn->d->t);
319 gettimeofday(&tv, 0);
320 TV_ADDL(&tv, &tv, 0, tdelta);
322 sel_addtimer(&sel, &dn->tm, &tv, dtimer, dn);
324 for (ta = tb = sel.timers; ta; ta = ta->next) {
325 ta = ta->next; if (!ta) break; assert(ta != tb);
326 ta = ta->next; if (!ta) break; assert(ta != tb);
329 printf(" delay %lu usecs", tdelta);
332 static void dsend(delaynode *dn, unsigned force)
336 fputs(" send...\n", stdout);
338 PASS(d->f->next, dn->buf, dn->sz);
339 fputs("delay ...", stdout);
348 sel_rmtimer(&ddn->tm);
349 sel_addtimer(&sel, &dn->tm, &ddn->tm.tv, dtimer, dn);
356 printf(" move id %u from slot %u to slot %u", ddn->seq, ddn->i, dn->i);
358 { unsigned i; for (i = 0; i < d->n; i++) assert(d->q[i].buf); }
359 fputs(" remove", stdout);
363 static void dtimer(struct timeval *tv, void *vv)
366 printf("delay timer peer `%s' id %u slot %u",
367 dn->d->f->p_from->name, dn->seq, dn->i);
369 dsend(dn, RND(dn->d->p_replay));
373 static void dodelay(filter *f, const octet *buf, size_t sz)
377 static unsigned seq = 0;
379 fputs("delay", stdout);
380 if (d->n == d->max) {
381 dn = &d->q[RND(d->n)];
382 printf(" force uid %u", dn->seq);
383 sel_rmtimer(&dn->tm);
390 printf(" new id %u in slot %u", dn->seq, dn->i);
391 dn->buf = xmalloc(sz);
393 memcpy(dn->buf, buf, sz);
398 static void adddelay(filter *f, unsigned ac, char **av)
403 if (ac < 1 || ac > 3)
404 die(1, "syntax: filt:delay:QLEN[:MILLIS:P-REPLAY]");
406 d->max = atoi(av[0]);
408 d->t = strtoul(av[1], 0, 10);
413 d->p_replay = atoi(av[2]);
417 d->q = xmalloc(d->max * sizeof(delaynode));
421 for (i = 0; i < d->max; i++) {
429 /*----- Filters -----------------------------------------------------------*/
431 static void dosend(filter *f, const octet *buf, size_t sz)
433 printf("send to `%s'\n", f->p_to->name);
434 DISCARD(write(f->p_to->sf.fd, buf, sz));
437 static void addsend(filter *f, unsigned ac, char **av)
440 die(1, "syntax: filt:send");
444 const struct filtab {
446 void (*func)(filter */*f*/, unsigned /*ac*/, char **/*av*/);
450 { "delay", adddelay },
452 { "corrupt", addcorrupt },
456 static void dofilter(peer *from, peer *to, unsigned ac, char **av)
458 filter **ff, *f = CREATE(filter);
459 const struct filtab *ft;
461 die(1, "syntax: {l,r,}filt:NAME:...");
466 for (ff = &from->f; *ff; ff = &(*ff)->next)
469 for (ft = filtab; ft->name; ft++) {
470 if (strcmp(av[0], ft->name) == 0) {
471 ft->func(f, ac - 1, av + 1);
475 die(1, "unknown filter `%s'", av[0]);
478 /*----- Flooding ----------------------------------------------------------*/
480 typedef struct flood {
488 static void setflood(flood *f);
490 static void floodtimer(struct timeval *tv, void *vv)
502 rng->ops->fill(rng, buf, sz);
505 puts("flood packet");
506 PASS(f->p->f, buf, sz);
510 static void setflood(flood *f)
513 gettimeofday(&tv, 0);
514 TV_ADDL(&tv, &tv, 0, RND(f->t));
515 sel_addtimer(&sel, &f->tm, &tv, floodtimer, f);
518 static void doflood(peer *p, unsigned ac, char **av)
522 die(1, "syntax: flood[:TYPE:MILLIS:SIZE]");
526 f->type = strtoul(av[0], 0, 16);
541 /*----- Configuration commands --------------------------------------------*/
543 static void parse(char *p);
545 static void addflood(unsigned ac, char **av) {
546 doflood(&peers[0], ac, av);
547 doflood(&peers[1], ac, av);
549 static void addlflood(unsigned ac, char **av) {
550 doflood(&peers[0], ac, av);
552 static void addrflood(unsigned ac, char **av) {
553 doflood(&peers[1], ac, av);
556 static void addfilter(unsigned ac, char **av) {
557 dofilter(&peers[0], &peers[1], ac, av);
558 dofilter(&peers[1], &peers[0], ac, av);
560 static void addlfilter(unsigned ac, char **av) {
561 dofilter(&peers[0], &peers[1], ac, av);
563 static void addrfilter(unsigned ac, char **av) {
564 dofilter(&peers[1], &peers[0], ac, av);
567 static void include(unsigned ac, char **av)
572 die(1, "syntax: include:FILE:...");
574 if ((fp = fopen(*av, "r")) == 0)
575 die(1, "fopen `%s': %s", *av, strerror(errno));
576 while (dstr_putline(&d, fp) != EOF) {
585 const struct cmdtab {
587 void (*func)(unsigned /*ac*/, char **/*av*/);
590 { "include", include },
591 { "filt", addfilter },
592 { "lfilt", addlfilter },
593 { "rfilt", addrfilter },
594 { "next", nextfork },
595 { "flood", addflood },
596 { "lflood", addlflood },
597 { "rflood", addrflood },
603 static void parse(char *p)
607 const struct cmdtab *ct;
615 } while (p && c < AVMAX - 1);
617 for (ct = cmdtab; ct->name; ct++) {
618 if (strcmp(ct->name, v[0]) == 0) {
619 ct->func(c - 1, v + 1);
623 die(1, "unknown command `%s'", v[0]);
626 /*----- Main driver -------------------------------------------------------*/
628 static void version(FILE *fp)
629 { pquis(fp, "$, TrIPE version " VERSION "\n"); }
631 static void usage(FILE *fp)
632 { pquis(fp, "Usage: $ [-k KEYRING] DIRECTIVE...\n"); }
634 static void help(FILE *fp)
642 -h, --help Show this help text.\n\
643 -v, --version Show the version number.\n\
644 -u, --usage Show terse usage summary.\n\
646 -k, --keyring=FILE Fetch keys from FILE.\n\
649 peer:NAME:LOCAL-PORT:REMOTE-ADDR:REMOTE-PORT\n\
651 {,l,r}filt:FILTER:ARGS:...\n\
653 {,l,r}flood:TYPE:MILLIS:SIZE\n\
658 delay:QLEN[:MILLIS:P-REPLAY]\n\
660 corrupt[:P-CORRUPT]\n",
664 int main(int argc, char *argv[])
666 const char *kfname = "keyring.pub";
675 static const struct option opt[] = {
676 { "help", 0, 0, 'h' },
677 { "version", 0, 0, 'v' },
678 { "usage", 0, 0, 'u' },
679 { "keyring", OPTF_ARGREQ, 0, 'k' },
682 if ((i = mdwopt(argc, argv, "hvuk:", opt, 0, 0, 0)) < 0)
706 rand_noisesrc(RAND_GLOBAL, &noise_source);
707 rand_seed(RAND_GLOBAL, 160);
708 rand_get(RAND_GLOBAL, buf, sizeof(buf));
709 rng = rc4_rand(buf, sizeof(buf));
711 if (key_open(&keys, kfname, KOPEN_READ, key_moan, 0))
712 die(1, "couldn't open `%s': %s", kfname, strerror(errno));
713 for (i = optind; i < argc; i++)
716 die(1, "need two peers");
718 if (sel_select(&sel) && errno != EINTR)
719 die(1, "select failed: %s", strerror(errno));
725 /*----- That's all, folks -------------------------------------------------*/