10 str2addr(char *s, uchar *a)
15 if((s = strchr(s, '!')) == nil)
17 if((p = strchr(++s, '!')) == nil)
19 if(strchr(++p, '!') != nil)
21 if(parseip(ip, s) == -1)
49 addr2str(char *proto, uchar *a){
58 if((a[0] | a[1] | a[2]) == 0 && a[3]){
60 a += strlen((char*)a)+1;
61 snprint(s, sizeof(s), "%s!%s!%d", proto, (char*)a, port);
81 snprint(s, sizeof(s), "%s!%.*s!%d", proto, n, (char*)a, port);
85 snprint(s, sizeof(s), "%s!%I!%d", proto, ip, port);
90 udprelay(int fd, char *dir)
96 char addr[128], ldir[40];
100 snprint(addr, sizeof(addr), "%s/udp!*!0", outside);
101 if((cfd = announce(addr, ldir)) < 0)
103 if(write(cfd, "headers", 7) != 7)
105 strcat(ldir, "/data");
106 if((rfd = open(ldir, ORDWR)) < 0)
110 if((r = rfork(RFMEM|RFPROC|RFNOWAIT)) <= 0)
113 if((cfd = listen(dir, ldir)) < 0)
115 if((fd = accept(cfd, ldir)) < 0)
118 switch(rfork(RFMEM|RFPROC|RFNOWAIT)){
122 while((r = read(fd, msg.data, sizeof(msg.data))) > 0){
126 if(p[0] | p[1] | p[2])
136 v4tov6(msg.raddr, p);
143 memmove(msg.raddr, p, 16);
147 memmove(msg.rport, p, 2);
149 memmove(msg.data, p, r);
150 write(rfd, &msg, sizeof(Udphdr)+r);
154 while((r = read(rfd, &msg, sizeof(msg))) > 0){
163 if(r+n > sizeof(msg.data))
164 r = sizeof(msg.data)-n;
171 v6tov4(p, msg.raddr);
175 memmove(p, msg.raddr, 16);
178 memmove(p, msg.rport, 2);
180 write(fd, msg.data, r);
191 return err ? 0x5b : 0x5a;
197 main(int argc, char *argv[])
199 uchar buf[8*1024], *p;
200 char addr[128], dir[40], ldir[40], *s;
204 fmtinstall('I', eipfmt);
206 setnetmtpt(inside, sizeof(inside), 0);
207 setnetmtpt(outside, sizeof(outside), 0);
210 setnetmtpt(inside, sizeof(inside), ARGF());
213 setnetmtpt(outside, sizeof(outside), ARGF());
217 /* ver+cmd or ver+nmethod */
218 if(readn(0, buf, 2) != 2)
228 if(readn(0, buf+2, 2+4) != 2+4)
231 for(p = buf+2+2+4;; p++){
232 if(p >= buf+sizeof(buf))
234 if(read(0, p, 1) != 1)
239 /* socks 4a dom hack */
240 if((buf[4] | buf[5] | buf[6]) == 0 && buf[7]){
243 if(p >= buf+sizeof(buf))
245 if(read(0, p, 1) != 1)
254 if(readn(0, buf+2, n) != n)
259 buf[1] = 0x00; /* no authentication required */
260 if(write(1, buf, 2) != 2)
263 /* ver+cmd+res+atyp */
264 if(readn(0, buf, 4) != 4)
269 case 0x01: /* +ipv4 */
270 if(readn(0, buf+4, 4+2) != 4+2)
273 case 0x03: /* +len+dom[len] */
274 if(readn(0, buf+4, 1) != 1)
276 if((n = buf[4]) == 0)
278 if(readn(0, buf+5, n+2) != n+2)
281 case 0x04: /* +ipv6 */
282 if(readn(0, buf+4, 16+2) != 16+2)
292 case 0x01: /* CONNECT */
293 snprint(addr, sizeof(addr), "%s/tcp", outside);
294 if((s = addr2str(addr, buf)) == nil)
297 fd = dial(s, 0, dir, &cfd);
300 case 0x02: /* BIND */
301 if(myipaddr(buf, outside) < 0)
303 snprint(addr, sizeof(addr), "%s/tcp!%I!0", outside, buf);
304 fd = announce(addr, dir);
307 if(myipaddr(buf, inside) < 0)
309 snprint(addr, sizeof(addr), "%s/udp!%I!0", inside, buf);
310 fd = announce(addr, dir);
316 buf[1] = sockerr(fd < 0); /* status */
318 buf[0] = 0x00; /* vc */
320 memset(buf+2, 0, 2+4);
321 write(1, buf, 2+2+4);
325 buf[0] = socksver; /* ver */
326 buf[2] = 0x00; /* res */
328 buf[3] = 0x01; /* atyp */
329 memset(buf+4, 0, 4+2);
330 write(1, buf, 4+4+2);
334 if((nc = getnetconninfo(dir, cfd)) == nil)
336 if((n = str2addr((cmd & 0x100) ? nc->raddr : nc->laddr, buf)) <= 0)
338 if(write(1, buf, n) != n)
344 case 0x01: /* CONNECT */
346 case 0x02: /* BIND */
347 cfd = listen(dir, ldir);
352 fd = accept(cfd, dir);
359 if(udprelay(fd, dir) == 0)
360 while(read(0, buf, sizeof(buf)) > 0)
366 switch(rfork(RFMEM|RFPROC|RFFDG|RFNOWAIT)){
375 while((n = read(0, buf, sizeof(buf))) > 0)
376 if(write(1, buf, n) != n)
381 postnote(PNGROUP, getpid(), "kill");