| 1 | /* polypath |
| 2 | * send/receive module for secnet |
| 3 | * for multi-route setups */ |
| 4 | |
| 5 | #include "secnet.h" |
| 6 | #include "util.h" |
| 7 | #include "unaligned.h" |
| 8 | #include "comm-common.h" |
| 9 | |
| 10 | #include <adns.h> |
| 11 | #include <ctype.h> |
| 12 | |
| 13 | #ifdef CONFIG_IPV6 |
| 14 | |
| 15 | static comm_sendmsg_fn polypath_sendmsg; |
| 16 | |
| 17 | struct interf { |
| 18 | char *name; /* from malloc */ |
| 19 | struct udpsocks socks; |
| 20 | bool_t experienced_xmit_noaf[MAX_AF+1]; |
| 21 | LIST_ENTRY(interf) entry; |
| 22 | }; |
| 23 | |
| 24 | struct polypath { |
| 25 | struct udpcommon uc; |
| 26 | int max_interfs; |
| 27 | const char *const *ifname_pats; |
| 28 | const char *const *monitor_command; |
| 29 | bool_t permit_loopback; |
| 30 | LIST_HEAD(,interf) interfs; |
| 31 | struct buffer_if lbuf; |
| 32 | int monitor_fd; |
| 33 | pid_t monitor_pid; |
| 34 | }; |
| 35 | |
| 36 | #define LG 0, st->uc.cc.cl.description, &st->uc.cc.loc |
| 37 | |
| 38 | static const char *const default_loopback_ifname_pats[] = { |
| 39 | "!lo", 0 |
| 40 | }; |
| 41 | static const char *const default_ifname_pats[] = { |
| 42 | "!tun*","!tap*","!sl*","!userv*", "*", 0 |
| 43 | }; |
| 44 | |
| 45 | static const char *const default_monitor_command[] = { |
| 46 | #if __linux__ |
| 47 | DATAROOTDIR "/secnet/" "polypath-interface-monitor-linux", 0 |
| 48 | #else |
| 49 | 0 |
| 50 | #endif |
| 51 | }; |
| 52 | |
| 53 | static const char *polypath_addr_to_string(void *commst, |
| 54 | const struct comm_addr *ca) |
| 55 | { |
| 56 | static char sbuf[100]; |
| 57 | |
| 58 | snprintf(sbuf, sizeof(sbuf), "polypath:%s", |
| 59 | iaddr_to_string(&ca->ia)); |
| 60 | return sbuf; |
| 61 | } |
| 62 | |
| 63 | static bool_t ifname_search_pats(struct polypath *st, struct cloc loc, |
| 64 | const char *ifname, bool_t *want_io, |
| 65 | const char *const *pats) { |
| 66 | /* Returns True iff we found a list entry, in which case *want_io |
| 67 | * is set to the sense of that entry. Otherwise *want_io is set |
| 68 | * to the sense of the last entry, or unchanged if there were no pats. */ |
| 69 | if (!pats) |
| 70 | return False; |
| 71 | const char *const *pati; |
| 72 | for (pati=pats; *pati; pati++) { |
| 73 | const char *pat=*pati; |
| 74 | if (*pat=='!') { *want_io=False; pat++; } |
| 75 | else if (*pat=='+') { *want_io=True; pat++; } |
| 76 | else if (*pat=='*' || isalnum((unsigned char)*pat)) { *want_io=True; } |
| 77 | else cfgfatal(loc,"polypath","invalid interface name pattern `%s'",pat); |
| 78 | int match=fnmatch(pat,ifname,0); |
| 79 | if (match==0) return True; |
| 80 | if (match!=FNM_NOMATCH) |
| 81 | cfgfatal(loc,"polypath","fnmatch failed! (pattern `%s')",pat); |
| 82 | } |
| 83 | return False; |
| 84 | } |
| 85 | |
| 86 | static bool_t ifname_wanted(struct polypath *st, struct cloc loc, |
| 87 | const char *ifname) { |
| 88 | bool_t want=False; /* pretend an empty cfg ends with !<doesn'tmatch> */ |
| 89 | if (ifname_search_pats(st,loc,ifname,&want, st->ifname_pats)) |
| 90 | return want; |
| 91 | if (want) /* last pattern was positive, do not search default */ |
| 92 | return False; |
| 93 | if (!st->permit_loopback && |
| 94 | ifname_search_pats(st,loc,ifname,&want, default_loopback_ifname_pats)) |
| 95 | return want; |
| 96 | if (ifname_search_pats(st,loc,ifname,&want, default_ifname_pats)) |
| 97 | return want; |
| 98 | abort(); |
| 99 | } |
| 100 | |
| 101 | static int polypath_beforepoll(void *state, struct pollfd *fds, int *nfds_io, |
| 102 | int *timeout_io) |
| 103 | { |
| 104 | struct polypath *st=state; |
| 105 | BEFOREPOLL_WANT_FDS(1); |
| 106 | fds[0].fd=st->monitor_fd; |
| 107 | fds[0].events=POLLIN; |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static inline bool_t matches32(uint32_t word, uint32_t prefix, int prefixlen) |
| 112 | { |
| 113 | assert(prefixlen>0); |
| 114 | assert(prefixlen<=32); |
| 115 | uint32_t mask = ~(((uint32_t)1 << (32-prefixlen)) - 1); |
| 116 | assert(!(prefix & ~mask)); |
| 117 | return (word & mask) == prefix; |
| 118 | } |
| 119 | |
| 120 | /* These macros expect |
| 121 | * bad_fn_type *const bad; |
| 122 | * void *badctx; |
| 123 | * and |
| 124 | * out: |
| 125 | */ |
| 126 | #define BAD(m) do{ bad(st,badctx,m,0); goto out; }while(0) |
| 127 | #define BADE(m,ev) do{ bad(st,badctx,m,ev); goto out; }while(0) |
| 128 | typedef void bad_fn_type(struct polypath *st, void *badctx, |
| 129 | const char* m, int ev); |
| 130 | |
| 131 | typedef void polypath_ppml_callback_type(struct polypath *st, |
| 132 | bad_fn_type *bad, void *badctx, |
| 133 | bool_t add, const char *ifname, const char *ifaddr, |
| 134 | const union iaddr *ia, int fd /* -1 if none yet */); |
| 135 | |
| 136 | struct ppml_bad_ctx { |
| 137 | const char *orgl; |
| 138 | char *undospace; |
| 139 | }; |
| 140 | |
| 141 | static void ppml_bad(struct polypath *st, void *badctx, const char *m, int ev) |
| 142 | { |
| 143 | struct ppml_bad_ctx *bc=badctx; |
| 144 | if (bc->undospace) |
| 145 | *(bc->undospace)=' '; |
| 146 | lg_perror(LG,M_WARNING,ev, |
| 147 | "error processing polypath state change: %s" |
| 148 | " (while processing `%s')", |
| 149 | m,bc->orgl); |
| 150 | } |
| 151 | |
| 152 | static void polypath_process_monitor_line(struct polypath *st, char *orgl, |
| 153 | polypath_ppml_callback_type *callback) |
| 154 | /* always calls callback with fd==-1 */ |
| 155 | { |
| 156 | struct udpcommon *uc=&st->uc; |
| 157 | char *l=orgl; |
| 158 | bad_fn_type (*const bad)=ppml_bad; |
| 159 | struct ppml_bad_ctx badctx[1]={{ |
| 160 | .orgl=orgl, |
| 161 | .undospace=0 |
| 162 | }}; |
| 163 | |
| 164 | bool_t add; |
| 165 | int c=*l++; |
| 166 | if (c=='+') add=True; |
| 167 | else if (c=='-') add=False; |
| 168 | else BAD("bad +/-"); |
| 169 | |
| 170 | int proto; |
| 171 | c=*l++; |
| 172 | if (c=='4') proto=AF_INET; |
| 173 | else if (c=='6') proto=AF_INET6; |
| 174 | else BAD("bad proto"); |
| 175 | |
| 176 | char *space=strchr(l,' '); |
| 177 | if (!space) BAD("no first space"); |
| 178 | const char *ifname=space+1; |
| 179 | |
| 180 | space=strchr(ifname,' '); |
| 181 | if (!space) BAD("no second space"); |
| 182 | const char *ifaddr=space+1; |
| 183 | *space=0; |
| 184 | badctx->undospace=space; |
| 185 | |
| 186 | union iaddr ia; |
| 187 | FILLZERO(ia); |
| 188 | socklen_t salen=sizeof(ia); |
| 189 | int r=adns_text2addr(ifaddr,uc->port, adns_qf_addrlit_ipv4_quadonly, |
| 190 | &ia.sa, &salen); |
| 191 | assert(r!=ENOSPC); |
| 192 | if (r) BADE("adns_text2addr",r); |
| 193 | if (ia.sa.sa_family!=proto) BAD("address family mismatch"); |
| 194 | |
| 195 | #define DONT(m) do{ \ |
| 196 | if (add) \ |
| 197 | lg_perror(LG,M_INFO,0,"ignoring %s [%s]: %s",ifname,ifaddr,m); \ |
| 198 | goto out; \ |
| 199 | }while(0) |
| 200 | |
| 201 | if (!ifname_wanted(st,st->uc.cc.loc,ifname)) |
| 202 | DONT("unwanted interface name"); |
| 203 | |
| 204 | switch (ia.sa.sa_family) { |
| 205 | case AF_INET6: { |
| 206 | const struct in6_addr *i6=&ia.sin6.sin6_addr; |
| 207 | #define DONTKIND(X,m) \ |
| 208 | if (IN6_IS_ADDR_##X(i6)) DONT("IPv6 address is " m) |
| 209 | DONTKIND(UNSPECIFIED, "unspecified"); |
| 210 | DONTKIND(MULTICAST , "multicast" ); |
| 211 | DONTKIND(LINKLOCAL , "link local" ); |
| 212 | DONTKIND(SITELOCAL , "site local" ); |
| 213 | DONTKIND(V4MAPPED , "v4-mapped" ); |
| 214 | if (!st->permit_loopback) |
| 215 | DONTKIND(LOOPBACK , "loopback" ); |
| 216 | #undef DONTKIND |
| 217 | #define DONTMASK(w7x,w6x,prefixlen,m) \ |
| 218 | if (matches32(get_uint32(i6->s6_addr), \ |
| 219 | ((uint32_t)0x##w7x << 16) | (uint32_t)0x##w6x, \ |
| 220 | prefixlen)) \ |
| 221 | DONT("IPv6 address is " m) |
| 222 | DONTMASK( 100, 0, 8, "Discard-Only (RFC6666)"); |
| 223 | DONTMASK(2001, 0, 23, "in IETF protocol block (RFC2928)"); |
| 224 | #undef DONTMASK |
| 225 | break; |
| 226 | } |
| 227 | case AF_INET: { |
| 228 | const uint32_t i4=htonl(ia.sin.sin_addr.s_addr); |
| 229 | if (i4==INADDR_ANY) DONT("IPv4 address is any/unspecified"); |
| 230 | if (i4==INADDR_BROADCAST) DONT("IPv4 address is all hosts broadcast"); |
| 231 | #define DONTMASK(b3,b2,b1,b0,prefixlen,m) do{ \ |
| 232 | const uint8_t prefixbytes[4] = { (b3),(b2),(b1),(b0) }; \ |
| 233 | if (matches32(i4,get_uint32(prefixbytes),prefixlen)) \ |
| 234 | DONT("IPv4 address is " m); \ |
| 235 | }while(0) |
| 236 | DONTMASK(169,254,0,0, 16, "link local"); |
| 237 | DONTMASK(224, 0,0,0, 4, "multicast"); |
| 238 | DONTMASK(192, 0,0,0, 24, "in IETF protocol block (RFC6890)"); |
| 239 | DONTMASK(240, 0,0,0, 4, "in reserved addressing block (RFC1112)"); |
| 240 | if (!st->permit_loopback) |
| 241 | DONTMASK(127, 0,0,0, 8, "loopback"); |
| 242 | #undef DONTMASK |
| 243 | break; |
| 244 | } |
| 245 | default: |
| 246 | abort(); |
| 247 | } |
| 248 | |
| 249 | #undef DONT |
| 250 | |
| 251 | /* OK, process it */ |
| 252 | callback(st, bad,badctx, add,ifname,ifaddr,&ia,-1); |
| 253 | |
| 254 | out:; |
| 255 | } |
| 256 | |
| 257 | static void dump_pria(struct polypath *st, const char *ifname) |
| 258 | { |
| 259 | #ifdef POLYPATH_DEBUG |
| 260 | struct interf *interf; |
| 261 | if (ifname) |
| 262 | lg_perror(LG,M_DEBUG,0, "polypath record ifaddr `%s'",ifname); |
| 263 | LIST_FOREACH(interf, &st->interfs, entry) { |
| 264 | lg_perror(LG,M_DEBUG,0, " polypath interface `%s', nsocks=%d", |
| 265 | interf->name, interf->socks.n_socks); |
| 266 | int i; |
| 267 | for (i=0; i<interf->socks.n_socks; i++) { |
| 268 | struct udpsock *us=&interf->socks.socks[i]; |
| 269 | lg_perror(LG,M_DEBUG,0, " polypath sock fd=%d addr=%s", |
| 270 | us->fd, iaddr_to_string(&us->addr)); |
| 271 | } |
| 272 | } |
| 273 | #endif |
| 274 | } |
| 275 | |
| 276 | static bool_t polypath_make_socket(struct polypath *st, |
| 277 | bad_fn_type *bad, void *badctx, |
| 278 | struct udpsock *us, const char *ifname) |
| 279 | /* on error exit has called bad; might leave us->fd as -1 */ |
| 280 | { |
| 281 | assert(us->fd==-1); |
| 282 | |
| 283 | bool_t ok=udp_make_socket(&st->uc,us,M_WARNING); |
| 284 | if (!ok) BAD("unable to set up socket"); |
| 285 | int r=setsockopt(us->fd,SOL_SOCKET,SO_BINDTODEVICE, |
| 286 | ifname,strlen(ifname)+1); |
| 287 | if (r) BADE("setsockopt(,,SO_BINDTODEVICE,)",errno); |
| 288 | return True; |
| 289 | |
| 290 | out: |
| 291 | return False; |
| 292 | } |
| 293 | |
| 294 | static void polypath_record_ifaddr(struct polypath *st, |
| 295 | bad_fn_type *bad, void *badctx, |
| 296 | bool_t add, const char *ifname, |
| 297 | const char *ifaddr, |
| 298 | const union iaddr *ia, int fd) |
| 299 | { |
| 300 | struct udpcommon *uc=&st->uc; |
| 301 | struct interf *interf=0; |
| 302 | struct udpsock *us=0; |
| 303 | |
| 304 | dump_pria(st,ifname); |
| 305 | |
| 306 | int n_ifs=0; |
| 307 | LIST_FOREACH(interf,&st->interfs,entry) { |
| 308 | if (!strcmp(interf->name,ifname)) |
| 309 | goto found_interf; |
| 310 | n_ifs++; |
| 311 | } |
| 312 | /* not found */ |
| 313 | if (n_ifs==st->max_interfs) BAD("too many interfaces"); |
| 314 | interf=malloc(sizeof(*interf)); |
| 315 | if (!interf) BADE("malloc for new interface",errno); |
| 316 | interf->name=0; |
| 317 | interf->socks.n_socks=0; |
| 318 | FILLZERO(interf->experienced_xmit_noaf); |
| 319 | LIST_INSERT_HEAD(&st->interfs,interf,entry); |
| 320 | udp_socks_register(&st->uc,&interf->socks); |
| 321 | interf->name=strdup(ifname); |
| 322 | if (!interf->name) BADE("strdup interface name",errno); |
| 323 | found_interf: |
| 324 | |
| 325 | if (add) { |
| 326 | if (interf->socks.n_socks == UDP_MAX_SOCKETS) |
| 327 | BAD("too many addresses on this interface"); |
| 328 | struct udpsock *us=&interf->socks.socks[interf->socks.n_socks]; |
| 329 | us->fd=-1; |
| 330 | COPY_OBJ(us->addr,*ia); |
| 331 | if (fd<0) { |
| 332 | bool_t ok=polypath_make_socket(st,bad,badctx, us,ifname); |
| 333 | if (!ok) goto out; |
| 334 | } else { |
| 335 | FILLZERO(us->experienced); |
| 336 | us->fd=fd; |
| 337 | fd=-1; |
| 338 | } |
| 339 | interf->socks.n_socks++; |
| 340 | us=0; /* do not destroy this socket during `out' */ |
| 341 | lg_perror(LG,M_INFO,0,"using %s %s",ifname,ifaddr); |
| 342 | } else { |
| 343 | int i; |
| 344 | for (i=0; i<interf->socks.n_socks; i++) |
| 345 | if (!memcmp(&interf->socks.socks[i].addr,ia,sizeof(*ia))) |
| 346 | goto address_remove_found; |
| 347 | BAD("address to remove not found"); |
| 348 | address_remove_found: |
| 349 | lg_perror(LG,M_INFO,0,"removed %s %s",ifname,ifaddr); |
| 350 | udp_destroy_socket(&st->uc,&interf->socks.socks[i]); |
| 351 | interf->socks.socks[i]= |
| 352 | interf->socks.socks[--interf->socks.n_socks]; |
| 353 | } |
| 354 | |
| 355 | out: |
| 356 | if (us) |
| 357 | udp_destroy_socket(uc,us); |
| 358 | if (fd>=0) |
| 359 | close(fd); |
| 360 | if (interf && !interf->socks.n_socks) { |
| 361 | udp_socks_deregister(&st->uc,&interf->socks); |
| 362 | LIST_REMOVE(interf,entry); |
| 363 | free(interf->name); |
| 364 | free(interf); |
| 365 | } |
| 366 | |
| 367 | dump_pria(st,0); |
| 368 | } |
| 369 | |
| 370 | static void subproc_problem(struct polypath *st, |
| 371 | enum async_linebuf_result alr, const char *emsg) |
| 372 | { |
| 373 | int status; |
| 374 | assert(st->monitor_pid); |
| 375 | |
| 376 | pid_t gotpid=waitpid(st->monitor_pid,&status,WNOHANG); |
| 377 | if (gotpid==st->monitor_pid) { |
| 378 | st->monitor_pid=0; |
| 379 | lg_exitstatus(LG,M_FATAL,status,"interface monitor"); |
| 380 | } else if (gotpid<0) |
| 381 | lg_perror(LG,M_ERR,errno,"unable to reap interface monitor"); |
| 382 | else |
| 383 | assert(gotpid==0); |
| 384 | |
| 385 | if (alr==async_linebuf_eof) |
| 386 | lg_perror(LG,M_FATAL,0,"unexpected EOF from interface monitor"); |
| 387 | else |
| 388 | lg_perror(LG,M_FATAL,0,"bad output from interface monitor: %s",emsg); |
| 389 | assert(!"not reached"); |
| 390 | } |
| 391 | |
| 392 | static void afterpoll_monitor(struct polypath *st, struct pollfd *fd, |
| 393 | polypath_ppml_callback_type *callback) |
| 394 | { |
| 395 | enum async_linebuf_result alr; |
| 396 | const char *emsg; |
| 397 | |
| 398 | while ((alr=async_linebuf_read(fd,&st->lbuf,&emsg)) == async_linebuf_ok) |
| 399 | polypath_process_monitor_line(st,st->lbuf.base,callback); |
| 400 | |
| 401 | if (alr==async_linebuf_nothing) |
| 402 | return; |
| 403 | |
| 404 | subproc_problem(st,alr,emsg); |
| 405 | } |
| 406 | |
| 407 | static void polypath_afterpoll_monitor(void *state, struct pollfd *fds, |
| 408 | int nfds) |
| 409 | { |
| 410 | struct polypath *st=state; |
| 411 | if (nfds<1) return; |
| 412 | afterpoll_monitor(st,fds,polypath_record_ifaddr); |
| 413 | } |
| 414 | |
| 415 | /* Actual udp packet sending work */ |
| 416 | static bool_t polypath_sendmsg(void *commst, struct buffer_if *buf, |
| 417 | const struct comm_addr *dest) |
| 418 | { |
| 419 | struct polypath *st=commst; |
| 420 | struct interf *interf; |
| 421 | bool_t allreasonable=True; |
| 422 | int af=dest->ia.sa.sa_family; |
| 423 | |
| 424 | LIST_FOREACH(interf,&st->interfs,entry) { |
| 425 | int i; |
| 426 | bool_t attempted=False, reasonable=False; |
| 427 | for (i=0; i<interf->socks.n_socks; i++) { |
| 428 | struct udpsock *us=&interf->socks.socks[i]; |
| 429 | if (af != us->addr.sa.sa_family) |
| 430 | continue; |
| 431 | attempted=True; |
| 432 | int r=sendto(us->fd,buf->start,buf->size, |
| 433 | 0,&dest->ia.sa,iaddr_socklen(&dest->ia)); |
| 434 | udp_sock_experienced(0,&st->uc, interf->name,us, |
| 435 | 1,af, r,errno); |
| 436 | if (r>=0) { |
| 437 | reasonable=True; |
| 438 | break; |
| 439 | } |
| 440 | if (!(errno==EAFNOSUPPORT || errno==ENETUNREACH)) |
| 441 | reasonable=True; |
| 442 | lg_perror(LG,M_DEBUG,errno,"%s [%s] xmit %"PRIu32" bytes to %s", |
| 443 | interf->name,iaddr_to_string(&us->addr), |
| 444 | buf->size,iaddr_to_string(&dest->ia)); |
| 445 | } |
| 446 | if (!attempted) |
| 447 | if (!interf->experienced_xmit_noaf[af]++) |
| 448 | lg_perror(LG,M_WARNING,0, |
| 449 | "%s has no suitable address to transmit %s", |
| 450 | interf->name, af_name(af)); |
| 451 | allreasonable *= reasonable; |
| 452 | } |
| 453 | return allreasonable; |
| 454 | } |
| 455 | |
| 456 | static void child_monitor(struct polypath *st, int childfd) |
| 457 | { |
| 458 | dup2(childfd,1); |
| 459 | execvp(st->monitor_command[0],(char**)st->monitor_command); |
| 460 | fprintf(stderr,"secnet: cannot execute %s: %s\n", |
| 461 | st->monitor_command[0], strerror(errno)); |
| 462 | exit(-1); |
| 463 | } |
| 464 | |
| 465 | static void start_subproc(struct polypath *st, void (*make_fdpair)(int[2]), |
| 466 | void (*child)(struct polypath *st, int childfd)) |
| 467 | { |
| 468 | int pfds[2]; |
| 469 | |
| 470 | assert(!st->monitor_pid); |
| 471 | assert(st->monitor_fd<0); |
| 472 | |
| 473 | make_fdpair(pfds); |
| 474 | |
| 475 | pid_t pid=fork(); |
| 476 | if (!pid) { |
| 477 | afterfork(); |
| 478 | child(st,pfds[1]); |
| 479 | abort(); |
| 480 | } |
| 481 | if (pid<0) |
| 482 | fatal_perror("%s: failed to fork for interface monitoring", |
| 483 | st->uc.cc.cl.description); |
| 484 | |
| 485 | close(pfds[1]); |
| 486 | st->monitor_pid=pid; |
| 487 | st->monitor_fd=pfds[0]; |
| 488 | setnonblock(st->monitor_fd); |
| 489 | } |
| 490 | |
| 491 | static void polypath_phase_startmonitor(void *sst, uint32_t newphase) |
| 492 | { |
| 493 | struct polypath *st=sst; |
| 494 | start_subproc(st,pipe_cloexec,child_monitor); |
| 495 | register_for_poll(st,polypath_beforepoll, |
| 496 | polypath_afterpoll_monitor,"polypath"); |
| 497 | } |
| 498 | |
| 499 | static void polypath_phase_shutdown(void *sst, uint32_t newphase) |
| 500 | { |
| 501 | struct polypath *st=sst; |
| 502 | if (st->monitor_pid) { |
| 503 | assert(st->monitor_pid>0); |
| 504 | kill(st->monitor_pid,SIGTERM); |
| 505 | } |
| 506 | } |
| 507 | |
| 508 | #undef BAD |
| 509 | #undef BADE |
| 510 | |
| 511 | static list_t *polypath_apply(closure_t *self, struct cloc loc, |
| 512 | dict_t *context, list_t *args) |
| 513 | { |
| 514 | struct polypath *st; |
| 515 | |
| 516 | COMM_APPLY(st,&st->uc.cc,polypath_,"polypath",loc); |
| 517 | COMM_APPLY_STANDARD(st,&st->uc.cc,"polypath",args); |
| 518 | UDP_APPLY_STANDARD(st,&st->uc,"polypath"); |
| 519 | |
| 520 | struct udpcommon *uc=&st->uc; |
| 521 | struct commcommon *cc=&uc->cc; |
| 522 | |
| 523 | st->max_interfs=dict_read_number(d,"max-interfaces",False,"polypath",loc,3); |
| 524 | |
| 525 | st->ifname_pats=dict_read_string_array(d,"interfaces",False,"polypath", |
| 526 | cc->loc,0); |
| 527 | st->permit_loopback=0; /* ifname_wanted reads this */ |
| 528 | ifname_wanted(st,st->uc.cc.loc," "); /* try to check each pattern */ |
| 529 | |
| 530 | st->monitor_command=dict_read_string_array(d,"monitor-command",False, |
| 531 | "polypath",cc->loc, default_monitor_command); |
| 532 | if (!st->monitor_command[0]) |
| 533 | cfgfatal(loc,"polypath","no polypath interface monitor-command" |
| 534 | " (polypath unsupported on this platform?)\n"); |
| 535 | |
| 536 | st->permit_loopback=dict_read_bool(d,"permit-loopback",False, |
| 537 | "polypath",cc->loc,False); |
| 538 | |
| 539 | LIST_INIT(&st->interfs); |
| 540 | buffer_new(&st->lbuf,ADNS_ADDR2TEXT_BUFLEN+100); |
| 541 | BUF_ALLOC(&st->lbuf,"polypath lbuf"); |
| 542 | |
| 543 | st->monitor_fd=-1; |
| 544 | st->monitor_pid=0; |
| 545 | |
| 546 | add_hook(PHASE_RUN, polypath_phase_startmonitor,st); |
| 547 | add_hook(PHASE_SHUTDOWN, polypath_phase_shutdown, st); |
| 548 | |
| 549 | return new_closure(&cc->cl); |
| 550 | } |
| 551 | |
| 552 | #endif /* CONFIG_IPV6 */ |
| 553 | |
| 554 | void polypath_module(dict_t *dict) |
| 555 | { |
| 556 | #ifdef CONFIG_IPV6 |
| 557 | add_closure(dict,"polypath",polypath_apply); |
| 558 | #endif /* CONFIG_IPV6 */ |
| 559 | } |