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d3372da9 | 1 | /* |
2 | * Dolda Connect - Modular multiuser Direct Connect-style client | |
302a2600 | 3 | * Copyright (C) 2004 Fredrik Tolf <fredrik@dolda2000.com> |
d3372da9 | 4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | /* XXX: Implement SOCKS proxyability */ | |
20 | ||
21 | #ifdef HAVE_CONFIG_H | |
22 | #include <config.h> | |
23 | #endif | |
24 | #include <string.h> | |
25 | #include <stdlib.h> | |
26 | #include <unistd.h> | |
27 | #include <fcntl.h> | |
28 | #include <sys/ioctl.h> | |
29 | #include <sys/socket.h> | |
30 | #include <sys/un.h> | |
31 | #include <sys/poll.h> | |
32 | #include <arpa/inet.h> | |
33 | #include <netinet/in.h> | |
34 | #include <netdb.h> | |
35 | #include <sys/signal.h> | |
7ab36fbd | 36 | #include <sys/stat.h> /* For rebindunix() */ |
d3372da9 | 37 | #ifdef HAVE_LINUX_SOCKIOS_H |
38 | #include <linux/sockios.h> | |
39 | #endif | |
40 | #include <errno.h> | |
41 | #include <net/if.h> | |
42 | ||
43 | #include "conf.h" | |
44 | #include "net.h" | |
45 | #include "module.h" | |
46 | #include "log.h" | |
47 | #include "utils.h" | |
48 | #include "sysevents.h" | |
49 | ||
50 | static struct configvar myvars[] = | |
51 | { | |
d9f89ef5 | 52 | /** The network mode to use. Currently supported values are 0 for |
53 | * active mode and 1 for passive mode. In the future, SOCKS5 proxy | |
54 | * support may be added. */ | |
d3372da9 | 55 | {CONF_VAR_INT, "mode", {.num = 0}}, |
d9f89ef5 | 56 | /** Set the SO_REUSEADDR socket option on listening sockets, so |
57 | * that dead TCP connections waiting for timeout are ignored. */ | |
347d6d76 | 58 | {CONF_VAR_BOOL, "reuseaddr", {.num = 0}}, |
d9f89ef5 | 59 | /** Overrides the IPv4 address reported to other clients in active |
60 | * mode. Useful for servers behind NAT routers. If both this and | |
61 | * net.publicif are unspecified the address of the hub connection | |
62 | * is used. */ | |
d3372da9 | 63 | {CONF_VAR_IPV4, "visibleipv4", {.ipv4 = {0}}}, |
d9f89ef5 | 64 | /** Specifies an interface name from which to fetch the IPv4 |
65 | * address reported to other clients in active mode. If both this | |
66 | * and net.visibleipv4 are unspecified the address of the hub | |
67 | * connection is used. */ | |
d3372da9 | 68 | {CONF_VAR_STRING, "publicif", {.str = L""}}, |
b020fb3d | 69 | /* Diffserv should be supported on IPv4, too, but I don't know the |
70 | * API to do that. */ | |
d9f89ef5 | 71 | /** The Diffserv value to use on IPv6 connections when the |
72 | * minimize cost TOS value is used (see the TOS VALUES | |
73 | * section). */ | |
b020fb3d | 74 | {CONF_VAR_INT, "diffserv-mincost", {.num = 0}}, |
d9f89ef5 | 75 | /** The Diffserv value to use on IPv6 connections when the |
76 | * maximize reliability TOS value is used (see the TOS VALUES | |
77 | * section). */ | |
b020fb3d | 78 | {CONF_VAR_INT, "diffserv-maxrel", {.num = 0}}, |
d9f89ef5 | 79 | /** The Diffserv value to use on IPv6 connections when the |
80 | * maximize throughput TOS value is used (see the TOS VALUES | |
81 | * section). */ | |
b020fb3d | 82 | {CONF_VAR_INT, "diffserv-maxtp", {.num = 0}}, |
d9f89ef5 | 83 | /** The Diffserv value to use on IPv6 connections when the |
84 | * minimize delay TOS value is used (see the TOS VALUES | |
85 | * section). */ | |
b020fb3d | 86 | {CONF_VAR_INT, "diffserv-mindelay", {.num = 0}}, |
d3372da9 | 87 | {CONF_VAR_END} |
88 | }; | |
89 | ||
90 | static struct socket *sockets = NULL; | |
91 | int numsocks = 0; | |
92 | ||
93 | /* XXX: Get autoconf for all this... */ | |
94 | int getpublicaddr(int af, struct sockaddr **addr, socklen_t *lenbuf) | |
95 | { | |
96 | struct sockaddr_in *ipv4; | |
97 | struct configvar *var; | |
98 | void *bufend; | |
99 | int sock; | |
100 | struct ifconf conf; | |
101 | struct ifreq *ifr, req; | |
102 | char *pif; | |
103 | ||
104 | if(af == AF_INET) | |
105 | { | |
106 | var = confgetvar("net", "visibleipv4"); | |
107 | if(var->val.ipv4.s_addr != 0) | |
108 | { | |
109 | ipv4 = smalloc(sizeof(*ipv4)); | |
110 | ipv4->sin_family = AF_INET; | |
111 | ipv4->sin_addr.s_addr = var->val.ipv4.s_addr; | |
112 | *addr = (struct sockaddr *)ipv4; | |
113 | *lenbuf = sizeof(*ipv4); | |
114 | return(0); | |
115 | } | |
bcb73bb3 | 116 | if((pif = icswcstombs(confgetstr("net", "publicif"), NULL, NULL)) == NULL) |
d3372da9 | 117 | { |
118 | flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno)); | |
119 | return(-1); | |
120 | } | |
6fb0c6ac | 121 | if(!strcmp(pif, "")) |
122 | return(1); | |
d3372da9 | 123 | if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) |
124 | return(-1); | |
125 | conf.ifc_buf = smalloc(conf.ifc_len = 65536); | |
126 | if(ioctl(sock, SIOCGIFCONF, &conf) < 0) | |
127 | { | |
128 | free(conf.ifc_buf); | |
129 | close(sock); | |
130 | return(-1); | |
131 | } | |
132 | bufend = ((char *)conf.ifc_buf) + conf.ifc_len; | |
133 | ipv4 = NULL; | |
134 | for(ifr = conf.ifc_ifcu.ifcu_req; (void *)ifr < bufend; ifr++) | |
135 | { | |
1315d02a | 136 | if(strcmp(ifr->ifr_name, pif)) |
6fb0c6ac | 137 | continue; |
d3372da9 | 138 | memset(&req, 0, sizeof(req)); |
139 | memcpy(req.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name)); | |
140 | if(ioctl(sock, SIOCGIFFLAGS, &req) < 0) | |
6fb0c6ac | 141 | break; |
142 | if(!(req.ifr_flags & IFF_UP)) | |
d3372da9 | 143 | { |
6fb0c6ac | 144 | flog(LOG_WARNING, "public interface is down"); |
145 | break; | |
d3372da9 | 146 | } |
6fb0c6ac | 147 | if(ifr->ifr_addr.sa_family != AF_INET) |
d3372da9 | 148 | { |
6fb0c6ac | 149 | flog(LOG_WARNING, "address of the public interface is not AF_INET"); |
150 | break; | |
d3372da9 | 151 | } |
6fb0c6ac | 152 | ipv4 = smalloc(sizeof(*ipv4)); |
153 | memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); | |
154 | break; | |
d3372da9 | 155 | } |
bcb73bb3 | 156 | free(conf.ifc_buf); |
d3372da9 | 157 | close(sock); |
158 | if(ipv4 != NULL) | |
159 | { | |
160 | *addr = (struct sockaddr *)ipv4; | |
161 | *lenbuf = sizeof(*ipv4); | |
162 | return(0); | |
163 | } | |
164 | errno = ENETDOWN; | |
165 | return(-1); | |
166 | } | |
6fb0c6ac | 167 | return(1); |
d3372da9 | 168 | } |
169 | ||
170 | static struct socket *newsock(int type) | |
171 | { | |
172 | struct socket *new; | |
173 | ||
174 | new = smalloc(sizeof(*new)); | |
175 | new->refcount = 2; | |
176 | new->fd = -1; | |
177 | new->isrealsocket = 1; | |
178 | new->family = -1; | |
179 | new->tos = 0; | |
180 | new->type = type; | |
181 | new->state = -1; | |
182 | new->ignread = 0; | |
183 | new->close = 0; | |
184 | new->remote = NULL; | |
185 | new->remotelen = 0; | |
a8c5ada6 | 186 | new->ucred.uid = -1; |
187 | new->ucred.gid = -1; | |
d3372da9 | 188 | switch(type) |
189 | { | |
190 | case SOCK_STREAM: | |
191 | new->outbuf.s.buf = NULL; | |
192 | new->outbuf.s.bufsize = 0; | |
193 | new->outbuf.s.datasize = 0; | |
194 | new->inbuf.s.buf = NULL; | |
195 | new->inbuf.s.bufsize = 0; | |
196 | new->inbuf.s.datasize = 0; | |
197 | break; | |
198 | case SOCK_DGRAM: | |
199 | new->outbuf.d.f = new->outbuf.d.l = NULL; | |
200 | new->inbuf.d.f = new->inbuf.d.l = NULL; | |
201 | break; | |
202 | } | |
cab0b442 | 203 | new->conncb = NULL; |
204 | new->errcb = NULL; | |
205 | new->readcb = NULL; | |
206 | new->writecb = NULL; | |
207 | new->acceptcb = NULL; | |
d3372da9 | 208 | new->next = sockets; |
209 | new->prev = NULL; | |
210 | if(sockets != NULL) | |
211 | sockets->prev = new; | |
212 | sockets = new; | |
213 | numsocks++; | |
214 | return(new); | |
215 | } | |
216 | ||
217 | static struct socket *mksock(int domain, int type) | |
218 | { | |
219 | int fd; | |
220 | struct socket *new; | |
221 | ||
222 | if((fd = socket(domain, type, 0)) < 0) | |
223 | { | |
224 | flog(LOG_CRIT, "could not create socket: %s", strerror(errno)); | |
225 | return(NULL); | |
226 | } | |
227 | new = newsock(type); | |
228 | new->fd = fd; | |
229 | new->family = domain; | |
230 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); | |
231 | return(new); | |
232 | } | |
233 | ||
234 | struct socket *wrapsock(int fd) | |
235 | { | |
236 | struct socket *new; | |
237 | ||
238 | new = newsock(SOCK_STREAM); | |
239 | new->fd = fd; | |
240 | new->state = SOCK_EST; | |
241 | new->isrealsocket = 0; | |
242 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); | |
243 | return(new); | |
244 | } | |
245 | ||
246 | static void unlinksock(struct socket *sk) | |
247 | { | |
248 | if(sk->prev != NULL) | |
249 | sk->prev->next = sk->next; | |
250 | if(sk->next != NULL) | |
251 | sk->next->prev = sk->prev; | |
252 | if(sk == sockets) | |
253 | sockets = sk->next; | |
254 | putsock(sk); | |
255 | numsocks--; | |
256 | } | |
257 | ||
258 | void getsock(struct socket *sk) | |
259 | { | |
260 | sk->refcount++; | |
261 | } | |
262 | ||
263 | void putsock(struct socket *sk) | |
264 | { | |
265 | struct dgrambuf *buf; | |
266 | ||
267 | if(--(sk->refcount) == 0) | |
268 | { | |
269 | switch(sk->type) | |
270 | { | |
271 | case SOCK_STREAM: | |
272 | if(sk->outbuf.s.buf != NULL) | |
273 | free(sk->outbuf.s.buf); | |
274 | if(sk->inbuf.s.buf != NULL) | |
275 | free(sk->inbuf.s.buf); | |
276 | break; | |
277 | case SOCK_DGRAM: | |
278 | while((buf = sk->outbuf.d.f) != NULL) | |
279 | { | |
280 | sk->outbuf.d.f = buf->next; | |
281 | free(buf->data); | |
161604ea | 282 | free(buf->addr); |
d3372da9 | 283 | free(buf); |
284 | } | |
285 | while((buf = sk->inbuf.d.f) != NULL) | |
286 | { | |
287 | sk->inbuf.d.f = buf->next; | |
288 | free(buf->data); | |
161604ea | 289 | free(buf->addr); |
d3372da9 | 290 | free(buf); |
291 | } | |
292 | break; | |
293 | } | |
b870805e | 294 | closesock(sk); |
d3372da9 | 295 | if(sk->remote != NULL) |
296 | free(sk->remote); | |
297 | free(sk); | |
298 | } | |
299 | } | |
300 | ||
336539c2 | 301 | void sockpushdata(struct socket *sk, void *buf, size_t size) |
302 | { | |
303 | switch(sk->type) | |
304 | { | |
305 | case SOCK_STREAM: | |
306 | sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + size, 1, 1); | |
307 | memmove(sk->inbuf.s.buf + size, sk->inbuf.s.buf, sk->inbuf.s.datasize); | |
308 | memcpy(sk->inbuf.s.buf, buf, size); | |
309 | sk->inbuf.s.datasize += size; | |
310 | break; | |
311 | case SOCK_DGRAM: | |
312 | /* XXX */ | |
313 | break; | |
314 | } | |
315 | return; | |
316 | } | |
317 | ||
d3372da9 | 318 | void *sockgetinbuf(struct socket *sk, size_t *size) |
319 | { | |
320 | void *buf; | |
321 | struct dgrambuf *dbuf; | |
322 | ||
323 | switch(sk->type) | |
324 | { | |
325 | case SOCK_STREAM: | |
326 | if((sk->inbuf.s.buf == NULL) || (sk->inbuf.s.datasize == 0)) | |
327 | { | |
328 | *size = 0; | |
329 | return(NULL); | |
330 | } | |
331 | buf = sk->inbuf.s.buf; | |
332 | *size = sk->inbuf.s.datasize; | |
333 | sk->inbuf.s.buf = NULL; | |
334 | sk->inbuf.s.bufsize = sk->inbuf.s.datasize = 0; | |
335 | return(buf); | |
336 | case SOCK_DGRAM: | |
337 | if((dbuf = sk->inbuf.d.f) == NULL) | |
338 | return(NULL); | |
339 | sk->inbuf.d.f = dbuf->next; | |
340 | if(dbuf->next == NULL) | |
341 | sk->inbuf.d.l = NULL; | |
342 | buf = dbuf->data; | |
343 | *size = dbuf->size; | |
344 | free(dbuf->addr); | |
345 | free(dbuf); | |
346 | return(buf); | |
347 | } | |
348 | return(NULL); | |
349 | } | |
350 | ||
9e5f2b29 | 351 | static void recvcmsg(struct socket *sk, struct msghdr *msg) |
352 | { | |
353 | struct cmsghdr *cmsg; | |
9e5f2b29 | 354 | |
355 | for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) | |
356 | { | |
a8c5ada6 | 357 | #if UNIX_AUTH_STYLE == 1 |
9e5f2b29 | 358 | if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS)) |
359 | { | |
a8c5ada6 | 360 | struct ucred *cred; |
361 | if(sk->ucred.uid == -1) | |
9e5f2b29 | 362 | { |
363 | cred = (struct ucred *)CMSG_DATA(cmsg); | |
a8c5ada6 | 364 | sk->ucred.uid = cred->uid; |
365 | sk->ucred.gid = cred->gid; | |
9e5f2b29 | 366 | } |
367 | } | |
a8c5ada6 | 368 | #endif |
9e5f2b29 | 369 | } |
370 | } | |
371 | ||
d3372da9 | 372 | static void sockrecv(struct socket *sk) |
373 | { | |
374 | int ret, inq; | |
375 | struct dgrambuf *dbuf; | |
9e5f2b29 | 376 | struct msghdr msg; |
377 | char cbuf[65536]; | |
378 | struct iovec bufvec; | |
d3372da9 | 379 | |
9e5f2b29 | 380 | memset(&msg, 0, sizeof(msg)); |
381 | msg.msg_iov = &bufvec; | |
382 | msg.msg_iovlen = 1; | |
383 | msg.msg_control = cbuf; | |
384 | msg.msg_controllen = sizeof(cbuf); | |
d3372da9 | 385 | switch(sk->type) |
386 | { | |
387 | case SOCK_STREAM: | |
388 | #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ) | |
389 | /* SIOCINQ is Linux-specific AFAIK, but I really have no idea | |
390 | * how to read the inqueue size on other OSs */ | |
dcf7a1a2 FT |
391 | if(sk->isrealsocket) { |
392 | if(ioctl(sk->fd, SIOCINQ, &inq)) | |
393 | { | |
394 | /* I don't really know what could go wrong here, so let's | |
395 | * assume it's transient. */ | |
396 | flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), sk->fd); | |
397 | inq = 2048; | |
398 | } | |
399 | } else { | |
400 | /* There are perils when trying to use SIOCINQ on files >2GiB... */ | |
401 | inq = 65536; | |
d3372da9 | 402 | } |
403 | #else | |
404 | inq = 2048; | |
405 | #endif | |
406 | if(inq > 65536) | |
407 | inq = 65536; | |
408 | sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + inq, 1, 1); | |
987518f8 | 409 | if(sk->isrealsocket) |
410 | { | |
411 | bufvec.iov_base = sk->inbuf.s.buf + sk->inbuf.s.datasize; | |
412 | bufvec.iov_len = inq; | |
413 | ret = recvmsg(sk->fd, &msg, 0); | |
414 | } else { | |
415 | ret = read(sk->fd, sk->inbuf.s.buf + sk->inbuf.s.datasize, inq); | |
416 | msg.msg_controllen = 0; | |
417 | msg.msg_flags = 0; | |
418 | } | |
d3372da9 | 419 | if(ret < 0) |
420 | { | |
421 | if((errno == EINTR) || (errno == EAGAIN)) | |
422 | return; | |
cab0b442 | 423 | if(sk->errcb != NULL) |
424 | sk->errcb(sk, errno, sk->data); | |
d3372da9 | 425 | closesock(sk); |
426 | return; | |
427 | } | |
9e5f2b29 | 428 | if(msg.msg_flags & MSG_CTRUNC) |
429 | flog(LOG_DEBUG, "ancillary data was truncated"); | |
430 | else | |
431 | recvcmsg(sk, &msg); | |
d3372da9 | 432 | if(ret == 0) |
433 | { | |
cab0b442 | 434 | if(sk->errcb != NULL) |
435 | sk->errcb(sk, 0, sk->data); | |
d3372da9 | 436 | closesock(sk); |
437 | return; | |
438 | } | |
439 | sk->inbuf.s.datasize += ret; | |
cab0b442 | 440 | if(sk->readcb != NULL) |
441 | sk->readcb(sk, sk->data); | |
d3372da9 | 442 | break; |
443 | case SOCK_DGRAM: | |
9e5f2b29 | 444 | #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ) |
d3372da9 | 445 | if(ioctl(sk->fd, SIOCINQ, &inq)) |
446 | { | |
447 | /* I don't really know what could go wrong here, so let's | |
448 | * assume it's transient. */ | |
449 | flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), sk->fd); | |
450 | return; | |
451 | } | |
9e5f2b29 | 452 | #else |
453 | inq = 65536; | |
454 | #endif | |
d3372da9 | 455 | dbuf = smalloc(sizeof(*dbuf)); |
456 | dbuf->data = smalloc(inq); | |
457 | dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage)); | |
9e5f2b29 | 458 | /* |
d3372da9 | 459 | ret = recvfrom(sk->fd, dbuf->data, inq, 0, dbuf->addr, &dbuf->addrlen); |
9e5f2b29 | 460 | */ |
461 | msg.msg_name = dbuf->addr; | |
462 | msg.msg_namelen = dbuf->addrlen; | |
463 | bufvec.iov_base = dbuf->data; | |
464 | bufvec.iov_len = inq; | |
465 | ret = recvmsg(sk->fd, &msg, 0); | |
466 | dbuf->addrlen = msg.msg_namelen; | |
d3372da9 | 467 | if(ret < 0) |
468 | { | |
469 | free(dbuf->addr); | |
470 | free(dbuf->data); | |
471 | free(dbuf); | |
472 | if((errno == EINTR) || (errno == EAGAIN)) | |
473 | return; | |
cab0b442 | 474 | if(sk->errcb != NULL) |
475 | sk->errcb(sk, errno, sk->data); | |
d3372da9 | 476 | closesock(sk); |
477 | return; | |
478 | } | |
9e5f2b29 | 479 | if(msg.msg_flags & MSG_CTRUNC) |
480 | flog(LOG_DEBUG, "ancillary data was truncated"); | |
481 | else | |
482 | recvcmsg(sk, &msg); | |
d3372da9 | 483 | /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't |
484 | * have EOF), but rather an empty packet. I don't know if any | |
485 | * other potential DGRAM protocols might have an EOF | |
486 | * condition, so let's play safe. */ | |
487 | if(ret == 0) | |
488 | { | |
489 | free(dbuf->addr); | |
490 | free(dbuf->data); | |
491 | free(dbuf); | |
492 | if(!((sk->family == AF_INET) || (sk->family == AF_INET6))) | |
493 | { | |
cab0b442 | 494 | if(sk->errcb != NULL) |
495 | sk->errcb(sk, 0, sk->data); | |
d3372da9 | 496 | closesock(sk); |
497 | } | |
498 | return; | |
499 | } | |
500 | dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen); | |
501 | dbuf->data = srealloc(dbuf->data, dbuf->size = ret); | |
502 | dbuf->next = NULL; | |
503 | if(sk->inbuf.d.l != NULL) | |
504 | sk->inbuf.d.l->next = dbuf; | |
505 | else | |
506 | sk->inbuf.d.f = dbuf; | |
507 | sk->inbuf.d.l = dbuf; | |
cab0b442 | 508 | if(sk->readcb != NULL) |
509 | sk->readcb(sk, sk->data); | |
d3372da9 | 510 | break; |
511 | } | |
512 | } | |
513 | ||
514 | static void sockflush(struct socket *sk) | |
515 | { | |
516 | int ret; | |
517 | struct dgrambuf *dbuf; | |
518 | ||
519 | switch(sk->type) | |
520 | { | |
521 | case SOCK_STREAM: | |
522 | if(sk->isrealsocket) | |
523 | ret = send(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL); | |
524 | else | |
525 | ret = write(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize); | |
526 | if(ret < 0) | |
527 | { | |
528 | /* For now, assume transient error, since | |
529 | * the socket is polled for errors */ | |
530 | break; | |
531 | } | |
532 | if(ret > 0) | |
533 | { | |
534 | memmove(sk->outbuf.s.buf, ((char *)sk->outbuf.s.buf) + ret, sk->outbuf.s.datasize -= ret); | |
cab0b442 | 535 | if(sk->writecb != NULL) |
536 | sk->writecb(sk, sk->data); | |
d3372da9 | 537 | } |
538 | break; | |
539 | case SOCK_DGRAM: | |
540 | dbuf = sk->outbuf.d.f; | |
541 | if((sk->outbuf.d.f = dbuf->next) == NULL) | |
542 | sk->outbuf.d.l = NULL; | |
543 | sendto(sk->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen); | |
544 | free(dbuf->data); | |
545 | free(dbuf->addr); | |
546 | free(dbuf); | |
cab0b442 | 547 | if(sk->writecb != NULL) |
548 | sk->writecb(sk, sk->data); | |
d3372da9 | 549 | break; |
550 | } | |
551 | } | |
552 | ||
553 | void closesock(struct socket *sk) | |
554 | { | |
b870805e | 555 | struct sockaddr_un *un; |
556 | ||
e0cbc756 | 557 | if((sk->family == AF_UNIX) && !sockgetlocalname(sk, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX)) |
b870805e | 558 | { |
7ab36fbd | 559 | if((sk->state == SOCK_LST) && strchr(un->sun_path, '/')) |
b870805e | 560 | { |
561 | if(unlink(un->sun_path)) | |
7ab36fbd | 562 | flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno)); |
b870805e | 563 | } |
564 | } | |
d3372da9 | 565 | sk->state = SOCK_STL; |
566 | close(sk->fd); | |
567 | sk->fd = -1; | |
568 | sk->close = 0; | |
569 | } | |
570 | ||
571 | void sockqueue(struct socket *sk, void *data, size_t size) | |
572 | { | |
573 | struct dgrambuf *new; | |
574 | ||
575 | if(sk->state == SOCK_STL) | |
576 | return; | |
577 | switch(sk->type) | |
578 | { | |
579 | case SOCK_STREAM: | |
580 | sizebuf(&(sk->outbuf.s.buf), &(sk->outbuf.s.bufsize), sk->outbuf.s.datasize + size, 1, 1); | |
581 | memcpy(sk->outbuf.s.buf + sk->outbuf.s.datasize, data, size); | |
582 | sk->outbuf.s.datasize += size; | |
583 | break; | |
584 | case SOCK_DGRAM: | |
585 | if(sk->remote == NULL) | |
586 | return; | |
587 | new = smalloc(sizeof(*new)); | |
588 | new->next = NULL; | |
589 | memcpy(new->data = smalloc(size), data, new->size = size); | |
590 | memcpy(new->addr = smalloc(sk->remotelen), sk->remote, new->addrlen = sk->remotelen); | |
591 | if(sk->outbuf.d.l == NULL) | |
592 | { | |
593 | sk->outbuf.d.l = sk->outbuf.d.f = new; | |
594 | } else { | |
595 | sk->outbuf.d.l->next = new; | |
596 | sk->outbuf.d.l = new; | |
597 | } | |
598 | break; | |
599 | } | |
600 | } | |
601 | ||
602 | size_t sockgetdatalen(struct socket *sk) | |
603 | { | |
604 | struct dgrambuf *b; | |
605 | size_t ret; | |
606 | ||
607 | switch(sk->type) | |
608 | { | |
609 | case SOCK_STREAM: | |
610 | ret = sk->inbuf.s.datasize; | |
611 | break; | |
612 | case SOCK_DGRAM: | |
613 | ret = 0; | |
614 | for(b = sk->inbuf.d.f; b != NULL; b = b->next) | |
615 | ret += b->size; | |
616 | break; | |
617 | } | |
618 | return(ret); | |
619 | } | |
620 | ||
621 | size_t sockqueuesize(struct socket *sk) | |
622 | { | |
623 | struct dgrambuf *b; | |
624 | size_t ret; | |
625 | ||
626 | switch(sk->type) | |
627 | { | |
628 | case SOCK_STREAM: | |
629 | ret = sk->outbuf.s.datasize; | |
630 | break; | |
631 | case SOCK_DGRAM: | |
632 | ret = 0; | |
633 | for(b = sk->outbuf.d.f; b != NULL; b = b->next) | |
634 | ret += b->size; | |
635 | break; | |
636 | } | |
637 | return(ret); | |
638 | } | |
639 | ||
d3372da9 | 640 | /* |
7ab36fbd | 641 | * Seriously, I don't know if it's naughty or not to remove |
642 | * pre-existing Unix sockets. | |
643 | */ | |
644 | static int rebindunix(struct socket *sk, struct sockaddr *name, socklen_t namelen) | |
645 | { | |
646 | struct sockaddr_un *un; | |
647 | struct stat sb; | |
648 | ||
649 | if((sk->family != AF_UNIX) || (name->sa_family != PF_UNIX)) | |
650 | return(-1); | |
651 | un = (struct sockaddr_un *)name; | |
652 | if(stat(un->sun_path, &sb)) | |
653 | return(-1); | |
654 | if(!S_ISSOCK(sb.st_mode)) | |
655 | return(-1); | |
656 | if(unlink(un->sun_path)) | |
657 | return(-1); | |
658 | if(bind(sk->fd, name, namelen) < 0) | |
659 | return(-1); | |
660 | return(0); | |
661 | } | |
662 | ||
663 | /* | |
d3372da9 | 664 | * The difference between netcslisten() and netcslistenlocal() is that |
665 | * netcslistenlocal() always listens on the local host, instead of | |
666 | * following proxy/passive mode directions. It is suitable for eg. the | |
667 | * UI channel, while the file sharing networks should, naturally, use | |
668 | * netcslisten() instead. | |
669 | */ | |
670 | ||
cab0b442 | 671 | struct socket *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data) |
d3372da9 | 672 | { |
673 | struct socket *sk; | |
66c517d2 | 674 | int intbuf; |
d3372da9 | 675 | |
676 | /* I don't know if this is actually correct (it probably isn't), | |
677 | * but since, at on least Linux systems, PF_* are specifically | |
678 | * #define'd to their AF_* counterparts, it allows for a severely | |
679 | * smoother implementation. If it breaks something on your | |
680 | * platform, please tell me so. | |
681 | */ | |
682 | if((sk = mksock(name->sa_family, type)) == NULL) | |
683 | return(NULL); | |
684 | sk->state = SOCK_LST; | |
687b2ee2 | 685 | if(confgetint("net", "reuseaddr")) |
686 | { | |
687 | intbuf = 1; | |
688 | setsockopt(sk->fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf)); | |
689 | } | |
7ab36fbd | 690 | if((bind(sk->fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(sk, name, namelen) < 0))) |
d3372da9 | 691 | { |
692 | putsock(sk); | |
693 | return(NULL); | |
694 | } | |
695 | if(listen(sk->fd, 16) < 0) | |
696 | { | |
697 | putsock(sk); | |
698 | return(NULL); | |
699 | } | |
cab0b442 | 700 | sk->acceptcb = func; |
701 | sk->data = data; | |
d3372da9 | 702 | return(sk); |
703 | } | |
704 | ||
cab0b442 | 705 | struct socket *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data) |
c23acc61 | 706 | { |
707 | if(confgetint("net", "mode") == 1) | |
708 | { | |
709 | errno = EOPNOTSUPP; | |
710 | return(NULL); | |
711 | } | |
c23acc61 | 712 | if(confgetint("net", "mode") == 0) |
713 | return(netcslistenlocal(type, name, namelen, func, data)); | |
714 | errno = EOPNOTSUPP; | |
715 | return(NULL); | |
716 | } | |
717 | ||
cab0b442 | 718 | struct socket *netcstcplisten(int port, int local, void (*func)(struct socket *, struct socket *, void *), void *data) |
0a1bc5b1 | 719 | { |
720 | struct sockaddr_in addr; | |
721 | #ifdef HAVE_IPV6 | |
722 | struct sockaddr_in6 addr6; | |
723 | #endif | |
cab0b442 | 724 | struct socket *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct socket *, struct socket *, void *), void *); |
0a1bc5b1 | 725 | struct socket *ret; |
726 | ||
727 | if(local) | |
728 | csfunc = netcslistenlocal; | |
729 | else | |
730 | csfunc = netcslisten; | |
731 | #ifdef HAVE_IPV6 | |
732 | memset(&addr6, 0, sizeof(addr6)); | |
733 | addr6.sin6_family = AF_INET6; | |
734 | addr6.sin6_port = htons(port); | |
735 | addr6.sin6_addr = in6addr_any; | |
736 | if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL) | |
737 | return(ret); | |
738 | if((ret == NULL) && (errno != EAFNOSUPPORT)) | |
739 | return(NULL); | |
740 | #endif | |
741 | memset(&addr, 0, sizeof(addr)); | |
742 | addr.sin_family = AF_INET; | |
743 | addr.sin_port = htons(port); | |
744 | return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data)); | |
745 | } | |
746 | ||
d3372da9 | 747 | struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen) |
748 | { | |
749 | struct socket *sk; | |
750 | int mode; | |
751 | ||
752 | mode = confgetint("net", "mode"); | |
753 | if((mode == 0) || (mode == 1)) | |
754 | { | |
755 | if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL) | |
756 | return(NULL); | |
757 | if(bind(sk->fd, name, namelen) < 0) | |
758 | { | |
759 | putsock(sk); | |
760 | return(NULL); | |
761 | } | |
762 | sk->state = SOCK_EST; | |
763 | return(sk); | |
764 | } | |
765 | errno = EOPNOTSUPP; | |
766 | return(NULL); | |
767 | } | |
768 | ||
769 | struct socket *netdupsock(struct socket *sk) | |
770 | { | |
771 | struct socket *newsk; | |
772 | ||
773 | newsk = newsock(sk->type); | |
774 | if((newsk->fd = dup(sk->fd)) < 0) | |
775 | { | |
776 | flog(LOG_WARNING, "could not dup() socket: %s", strerror(errno)); | |
777 | putsock(newsk); | |
778 | return(NULL); | |
779 | } | |
780 | newsk->state = sk->state; | |
781 | newsk->ignread = sk->ignread; | |
782 | if(sk->remote != NULL) | |
783 | memcpy(newsk->remote = smalloc(sk->remotelen), sk->remote, newsk->remotelen = sk->remotelen); | |
784 | return(newsk); | |
785 | } | |
786 | ||
787 | void netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen) | |
788 | { | |
789 | if(sk->remote != NULL) | |
790 | free(sk->remote); | |
791 | memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen); | |
792 | sk->ignread = 1; | |
793 | } | |
794 | ||
cab0b442 | 795 | struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data) |
d3372da9 | 796 | { |
797 | struct socket *sk; | |
798 | int mode; | |
799 | ||
800 | mode = confgetint("net", "mode"); | |
801 | if((mode == 0) || (mode == 1)) | |
802 | { | |
803 | if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL) | |
804 | return(NULL); | |
805 | memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen); | |
806 | if(!connect(sk->fd, addr, addrlen)) | |
807 | { | |
808 | sk->state = SOCK_EST; | |
809 | func(sk, 0, data); | |
810 | return(sk); | |
811 | } | |
812 | if(errno == EINPROGRESS) | |
813 | { | |
814 | sk->state = SOCK_SYN; | |
cab0b442 | 815 | sk->conncb = func; |
816 | sk->data = data; | |
d3372da9 | 817 | return(sk); |
818 | } | |
819 | putsock(sk); | |
820 | return(NULL); | |
821 | } | |
822 | errno = EOPNOTSUPP; | |
823 | return(NULL); | |
824 | } | |
825 | ||
9e5f2b29 | 826 | static void acceptunix(struct socket *sk) |
827 | { | |
828 | int buf; | |
829 | ||
830 | buf = 1; | |
a8c5ada6 | 831 | #if UNIX_AUTH_STYLE == 1 |
9e5f2b29 | 832 | if(setsockopt(sk->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0) |
833 | flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", sk->fd, strerror(errno)); | |
a8c5ada6 | 834 | #elif UNIX_AUTH_STYLE == 2 |
835 | if(getpeereid(sk->fd, &sk->ucred.uid, &sk->ucred.gid) < 0) | |
836 | { | |
837 | flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", sk->fd, strerror(errno)); | |
838 | sk->ucred.uid = -1; | |
839 | sk->ucred.gid = -1; | |
840 | } | |
841 | #endif | |
9e5f2b29 | 842 | } |
843 | ||
d3372da9 | 844 | int pollsocks(int timeout) |
845 | { | |
eaa35963 | 846 | int i, num, ret; |
847 | socklen_t retlen; | |
d3372da9 | 848 | int newfd; |
849 | struct pollfd *pfds; | |
850 | struct socket *sk, *next, *newsk; | |
851 | struct sockaddr_storage ss; | |
852 | socklen_t sslen; | |
853 | ||
854 | pfds = smalloc(sizeof(*pfds) * (num = numsocks)); | |
855 | for(i = 0, sk = sockets; i < num; sk = sk->next) | |
856 | { | |
857 | if(sk->state == SOCK_STL) | |
858 | { | |
859 | num--; | |
860 | continue; | |
861 | } | |
862 | pfds[i].fd = sk->fd; | |
863 | pfds[i].events = 0; | |
864 | if(!sk->ignread) | |
865 | pfds[i].events |= POLLIN; | |
866 | if((sk->state == SOCK_SYN) || (sockqueuesize(sk) > 0)) | |
867 | pfds[i].events |= POLLOUT; | |
868 | pfds[i].revents = 0; | |
869 | i++; | |
870 | } | |
871 | ret = poll(pfds, num, timeout); | |
872 | if(ret < 0) | |
873 | { | |
874 | if(errno != EINTR) | |
875 | { | |
876 | flog(LOG_CRIT, "pollsocks: poll errored out: %s", strerror(errno)); | |
877 | /* To avoid CPU hogging in case it's bad, which it | |
878 | * probably is. */ | |
879 | sleep(1); | |
880 | } | |
881 | free(pfds); | |
882 | return(1); | |
883 | } | |
884 | for(sk = sockets; sk != NULL; sk = next) | |
885 | { | |
886 | next = sk->next; | |
887 | for(i = 0; i < num; i++) | |
888 | { | |
889 | if(pfds[i].fd == sk->fd) | |
890 | break; | |
891 | } | |
892 | if(i == num) | |
893 | continue; | |
894 | switch(sk->state) | |
895 | { | |
896 | case SOCK_LST: | |
897 | if(pfds[i].revents & POLLIN) | |
898 | { | |
899 | sslen = sizeof(ss); | |
900 | if((newfd = accept(sk->fd, (struct sockaddr *)&ss, &sslen)) < 0) | |
cab0b442 | 901 | { |
902 | if(sk->errcb != NULL) | |
903 | sk->errcb(sk, errno, sk->data); | |
904 | } | |
d3372da9 | 905 | newsk = newsock(sk->type); |
906 | newsk->fd = newfd; | |
907 | newsk->family = sk->family; | |
908 | newsk->state = SOCK_EST; | |
909 | memcpy(newsk->remote = smalloc(sslen), &ss, sslen); | |
910 | newsk->remotelen = sslen; | |
9e5f2b29 | 911 | if(ss.ss_family == PF_UNIX) |
912 | acceptunix(newsk); | |
cab0b442 | 913 | if(sk->acceptcb != NULL) |
914 | sk->acceptcb(sk, newsk, sk->data); | |
9e5f2b29 | 915 | putsock(newsk); |
d3372da9 | 916 | } |
917 | if(pfds[i].revents & POLLERR) | |
918 | { | |
919 | retlen = sizeof(ret); | |
920 | getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); | |
cab0b442 | 921 | if(sk->errcb != NULL) |
922 | sk->errcb(sk, ret, sk->data); | |
d3372da9 | 923 | continue; |
924 | } | |
925 | break; | |
926 | case SOCK_SYN: | |
927 | if(pfds[i].revents & POLLERR) | |
928 | { | |
929 | retlen = sizeof(ret); | |
930 | getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); | |
cab0b442 | 931 | if(sk->conncb != NULL) |
932 | sk->conncb(sk, ret, sk->data); | |
d3372da9 | 933 | closesock(sk); |
934 | continue; | |
935 | } | |
936 | if(pfds[i].revents & (POLLIN | POLLOUT)) | |
937 | { | |
938 | sk->state = SOCK_EST; | |
cab0b442 | 939 | if(sk->conncb != NULL) |
940 | sk->conncb(sk, 0, sk->data); | |
d3372da9 | 941 | } |
942 | break; | |
943 | case SOCK_EST: | |
944 | if(pfds[i].revents & POLLERR) | |
945 | { | |
946 | retlen = sizeof(ret); | |
947 | getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); | |
cab0b442 | 948 | if(sk->errcb != NULL) |
949 | sk->errcb(sk, ret, sk->data); | |
d3372da9 | 950 | closesock(sk); |
951 | continue; | |
952 | } | |
953 | if(pfds[i].revents & POLLIN) | |
954 | sockrecv(sk); | |
955 | if(pfds[i].revents & POLLOUT) | |
956 | { | |
957 | if(sockqueuesize(sk) > 0) | |
958 | sockflush(sk); | |
959 | } | |
960 | break; | |
961 | } | |
962 | if(pfds[i].revents & POLLNVAL) | |
963 | { | |
964 | flog(LOG_CRIT, "BUG: stale socket struct on fd %i", sk->fd); | |
965 | sk->state = SOCK_STL; | |
966 | unlinksock(sk); | |
967 | continue; | |
968 | } | |
969 | if(pfds[i].revents & POLLHUP) | |
970 | { | |
cab0b442 | 971 | if(sk->errcb != NULL) |
972 | sk->errcb(sk, 0, sk->data); | |
d3372da9 | 973 | closesock(sk); |
974 | unlinksock(sk); | |
975 | continue; | |
976 | } | |
977 | } | |
978 | free(pfds); | |
979 | for(sk = sockets; sk != NULL; sk = next) | |
980 | { | |
981 | next = sk->next; | |
982 | if(sk->refcount == 1 && (sockqueuesize(sk) == 0)) | |
983 | { | |
984 | unlinksock(sk); | |
985 | continue; | |
986 | } | |
987 | if(sk->close && (sockqueuesize(sk) == 0)) | |
988 | closesock(sk); | |
989 | if(sk->state == SOCK_STL) | |
990 | { | |
991 | unlinksock(sk); | |
992 | continue; | |
993 | } | |
994 | } | |
995 | return(1); | |
996 | } | |
997 | ||
998 | int socksettos(struct socket *sk, int tos) | |
999 | { | |
b020fb3d | 1000 | int buf; |
1001 | ||
7ab36fbd | 1002 | if(sk->family == AF_UNIX) |
1003 | return(0); /* Unix sockets are always perfect. :) */ | |
d3372da9 | 1004 | if(sk->family == AF_INET) |
1005 | { | |
b020fb3d | 1006 | switch(tos) |
1007 | { | |
b198bed6 | 1008 | case 0: |
1009 | buf = 0; | |
1010 | break; | |
b020fb3d | 1011 | case SOCK_TOS_MINCOST: |
18c1ae1d | 1012 | buf = 0x02; |
b020fb3d | 1013 | break; |
1014 | case SOCK_TOS_MAXREL: | |
18c1ae1d | 1015 | buf = 0x04; |
b020fb3d | 1016 | break; |
1017 | case SOCK_TOS_MAXTP: | |
18c1ae1d | 1018 | buf = 0x08; |
b020fb3d | 1019 | break; |
1020 | case SOCK_TOS_MINDELAY: | |
18c1ae1d | 1021 | buf = 0x10; |
b020fb3d | 1022 | break; |
1023 | default: | |
1024 | flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos); | |
1025 | return(-1); | |
1026 | } | |
e03e1e7c | 1027 | if(setsockopt(sk->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0) |
d3372da9 | 1028 | { |
1029 | flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno)); | |
1030 | return(-1); | |
1031 | } | |
1032 | return(0); | |
1033 | } | |
b020fb3d | 1034 | if(sk->family == AF_INET6) |
1035 | { | |
1036 | switch(tos) | |
1037 | { | |
b198bed6 | 1038 | case 0: |
1039 | buf = 0; | |
b020fb3d | 1040 | case SOCK_TOS_MINCOST: |
1041 | buf = confgetint("net", "diffserv-mincost"); | |
1042 | break; | |
1043 | case SOCK_TOS_MAXREL: | |
1044 | buf = confgetint("net", "diffserv-maxrel"); | |
1045 | break; | |
1046 | case SOCK_TOS_MAXTP: | |
1047 | buf = confgetint("net", "diffserv-maxtp"); | |
1048 | break; | |
1049 | case SOCK_TOS_MINDELAY: | |
1050 | buf = confgetint("net", "diffserv-mindelay"); | |
1051 | break; | |
1052 | default: | |
1053 | flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos); | |
1054 | return(-1); | |
1055 | } | |
1056 | /* | |
1057 | On Linux, the API IPv6 flow label management doesn't seem to | |
1058 | be entirely complete, so I guess this will have to wait. | |
1059 | ||
1060 | if(setsockopt(...) < 0) | |
1061 | { | |
1062 | flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno)); | |
1063 | return(-1); | |
1064 | } | |
1065 | */ | |
1066 | return(0); | |
1067 | } | |
d3372da9 | 1068 | flog(LOG_WARNING, "could not set TOS on sock of family %i", sk->family); |
1069 | return(1); | |
1070 | } | |
1071 | ||
1072 | struct resolvedata | |
1073 | { | |
1074 | int fd; | |
1075 | void (*callback)(struct sockaddr *addr, int addrlen, void *data); | |
1076 | void *data; | |
1077 | struct sockaddr_storage addr; | |
1078 | int addrlen; | |
1079 | }; | |
1080 | ||
1081 | static void resolvecb(pid_t pid, int status, struct resolvedata *data) | |
1082 | { | |
1083 | static char buf[80]; | |
1084 | int ret; | |
1085 | struct sockaddr_in *ipv4; | |
1086 | ||
1087 | if(!status) | |
1088 | { | |
1089 | if((ret = read(data->fd, buf, sizeof(buf))) != 4) | |
1090 | { | |
b4d16e90 | 1091 | errno = ENOENT; |
d3372da9 | 1092 | data->callback(NULL, 0, data->data); |
1093 | } else { | |
1094 | ipv4 = (struct sockaddr_in *)&data->addr; | |
1095 | memcpy(&ipv4->sin_addr, buf, 4); | |
1096 | data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data); | |
1097 | } | |
1098 | } else { | |
b4d16e90 | 1099 | errno = ENOENT; |
d3372da9 | 1100 | data->callback(NULL, 0, data->data); |
1101 | } | |
1102 | close(data->fd); | |
1103 | free(data); | |
1104 | } | |
1105 | ||
1106 | int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data) | |
1107 | { | |
1108 | int i; | |
1109 | char *p; | |
1110 | int port; | |
1111 | int pfd[2]; | |
1112 | pid_t child; | |
1113 | struct resolvedata *rdata; | |
1114 | struct sockaddr_in ipv4; | |
1115 | struct hostent *he; | |
1116 | sigset_t sigset; | |
1117 | ||
1118 | /* IPv4 */ | |
1119 | port = -1; | |
1120 | if((p = strchr(addr, ':')) != NULL) | |
1121 | { | |
1122 | *p = 0; | |
1123 | port = atoi(p + 1); | |
1124 | } | |
1125 | ipv4.sin_family = AF_INET; | |
1126 | ipv4.sin_port = htons(port); | |
1127 | if(inet_aton(addr, &ipv4.sin_addr)) | |
1128 | { | |
1129 | callback((struct sockaddr *)&ipv4, sizeof(ipv4), data); | |
1130 | } else { | |
1131 | sigemptyset(&sigset); | |
1132 | sigaddset(&sigset, SIGCHLD); | |
1133 | sigprocmask(SIG_BLOCK, &sigset, NULL); | |
1134 | if((pipe(pfd) < 0) || ((child = fork()) < 0)) | |
1135 | { | |
1136 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); | |
1137 | return(-1); | |
1138 | } | |
1139 | if(child == 0) | |
1140 | { | |
1141 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); | |
1142 | for(i = 3; i < FD_SETSIZE; i++) | |
1143 | { | |
1144 | if(i != pfd[1]) | |
1145 | close(i); | |
1146 | } | |
1147 | signal(SIGALRM, SIG_DFL); | |
1148 | alarm(30); | |
1149 | if((he = gethostbyname(addr)) == NULL) | |
1150 | exit(1); | |
1151 | write(pfd[1], he->h_addr_list[0], 4); | |
1152 | exit(0); | |
1153 | } else { | |
1154 | close(pfd[1]); | |
1155 | fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK); | |
1156 | rdata = smalloc(sizeof(*rdata)); | |
1157 | rdata->fd = pfd[0]; | |
1158 | rdata->callback = callback; | |
1159 | rdata->data = data; | |
1160 | memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4)); | |
1161 | childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata); | |
1162 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); | |
1163 | return(1); | |
1164 | } | |
1165 | } | |
1166 | return(0); | |
1167 | } | |
1168 | ||
1169 | int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf) | |
1170 | { | |
1171 | socklen_t len; | |
1172 | struct sockaddr_storage name; | |
1173 | ||
1174 | *namebuf = NULL; | |
1175 | if((sk->state == SOCK_STL) || (sk->fd < 0)) | |
1176 | return(-1); | |
1177 | len = sizeof(name); | |
1178 | if(getsockname(sk->fd, (struct sockaddr *)&name, &len) < 0) | |
1179 | { | |
6fb0c6ac | 1180 | flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno)); |
d3372da9 | 1181 | return(-1); |
1182 | } | |
1183 | *namebuf = memcpy(smalloc(len), &name, len); | |
b870805e | 1184 | if(lenbuf != NULL) |
1185 | *lenbuf = len; | |
d3372da9 | 1186 | return(0); |
1187 | } | |
1188 | ||
eaa35963 | 1189 | static void sethostaddr(struct sockaddr *dst, struct sockaddr *src) |
1190 | { | |
1191 | if(dst->sa_family != src->sa_family) | |
1192 | { | |
1193 | flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family); | |
1194 | return; | |
1195 | } | |
1196 | switch(src->sa_family) | |
1197 | { | |
1198 | case AF_INET: | |
1199 | ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr; | |
1200 | break; | |
1201 | case AF_INET6: | |
1202 | ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr; | |
1203 | break; | |
1204 | default: | |
1205 | flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family); | |
1206 | break; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | static int makepublic(struct sockaddr *addr) | |
d3372da9 | 1211 | { |
6fb0c6ac | 1212 | int ret; |
eaa35963 | 1213 | socklen_t plen; |
1214 | struct sockaddr *pname; | |
1215 | ||
1216 | if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0) | |
1217 | { | |
1218 | flog(LOG_ERR, "could not get public address: %s", strerror(errno)); | |
1219 | return(-1); | |
1220 | } | |
1221 | if(ret) | |
1222 | return(0); | |
1223 | sethostaddr(addr, pname); | |
1224 | free(pname); | |
1225 | return(0); | |
1226 | } | |
1227 | ||
1228 | int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf) | |
1229 | { | |
d3372da9 | 1230 | socklen_t len; |
6fb0c6ac | 1231 | struct sockaddr *name; |
d3372da9 | 1232 | |
1233 | switch(confgetint("net", "mode")) | |
1234 | { | |
1235 | case 0: | |
1236 | *namebuf = NULL; | |
1237 | if((sk->state == SOCK_STL) || (sk->fd < 0)) | |
d3372da9 | 1238 | { |
eaa35963 | 1239 | errno = EBADF; |
d3372da9 | 1240 | return(-1); |
1241 | } | |
6fb0c6ac | 1242 | if(!sockgetlocalname(sk, &name, &len)) |
1243 | { | |
1244 | *namebuf = name; | |
1245 | *lenbuf = len; | |
eaa35963 | 1246 | makepublic(name); |
6fb0c6ac | 1247 | return(0); |
1248 | } | |
1249 | flog(LOG_ERR, "could not get remotely accessible name by any means"); | |
1250 | return(-1); | |
d3372da9 | 1251 | case 1: |
1252 | errno = EOPNOTSUPP; | |
1253 | return(-1); | |
1254 | default: | |
1255 | flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode")); | |
1256 | errno = EOPNOTSUPP; | |
1257 | return(-1); | |
1258 | } | |
1259 | } | |
1260 | ||
d29853b1 | 1261 | int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf) |
1262 | { | |
1263 | struct sockaddr *name1, *name2; | |
1264 | socklen_t len1, len2; | |
1265 | ||
1266 | if(sk->family != sk2->family) | |
1267 | { | |
1268 | flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", sk->family, sk2->family); | |
1269 | return(-1); | |
1270 | } | |
3804379d | 1271 | if(sockgetremotename(sk, &name1, &len1)) |
d29853b1 | 1272 | return(-1); |
3804379d | 1273 | if(sockgetremotename(sk2, &name2, &len2)) { |
d29853b1 | 1274 | free(name1); |
1275 | return(-1); | |
1276 | } | |
1277 | sethostaddr(name1, name2); | |
1278 | free(name2); | |
1279 | *namebuf = name1; | |
1280 | *lenbuf = len1; | |
1281 | return(0); | |
1282 | } | |
1283 | ||
99a28d47 | 1284 | int addreq(struct sockaddr *x, struct sockaddr *y) |
1285 | { | |
1286 | struct sockaddr_un *u1, *u2; | |
1287 | struct sockaddr_in *n1, *n2; | |
1288 | #ifdef HAVE_IPV6 | |
1289 | struct sockaddr_in6 *s1, *s2; | |
1290 | #endif | |
1291 | ||
1292 | if(x->sa_family != y->sa_family) | |
1293 | return(0); | |
1294 | switch(x->sa_family) { | |
1295 | case AF_UNIX: | |
1296 | u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y; | |
1297 | if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path))) | |
1298 | return(0); | |
1299 | break; | |
1300 | case AF_INET: | |
1301 | n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y; | |
1302 | if(n1->sin_port != n2->sin_port) | |
1303 | return(0); | |
1304 | if(n1->sin_addr.s_addr != n2->sin_addr.s_addr) | |
1305 | return(0); | |
1306 | break; | |
c8a729d7 | 1307 | #ifdef HAVE_IPV6 |
99a28d47 | 1308 | case AF_INET6: |
1309 | s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y; | |
1310 | if(s1->sin6_port != s2->sin6_port) | |
1311 | return(0); | |
1312 | if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr))) | |
1313 | return(0); | |
1314 | break; | |
c8a729d7 | 1315 | #endif |
99a28d47 | 1316 | } |
1317 | return(1); | |
1318 | } | |
1319 | ||
d3372da9 | 1320 | char *formataddress(struct sockaddr *arg, socklen_t arglen) |
1321 | { | |
d3372da9 | 1322 | struct sockaddr_in *ipv4; |
1323 | #ifdef HAVE_IPV6 | |
1324 | struct sockaddr_in6 *ipv6; | |
1325 | #endif | |
1326 | static char *ret = NULL; | |
1327 | char buf[1024]; | |
1328 | ||
1329 | if(ret != NULL) | |
1330 | free(ret); | |
1331 | ret = NULL; | |
1332 | switch(arg->sa_family) | |
1333 | { | |
1334 | case AF_UNIX: | |
6a97462e | 1335 | ret = sstrdup("Unix socket"); |
d3372da9 | 1336 | break; |
1337 | case AF_INET: | |
1338 | ipv4 = (struct sockaddr_in *)arg; | |
1339 | if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL) | |
1340 | return(NULL); | |
1341 | ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port)); | |
1342 | break; | |
1343 | #ifdef HAVE_IPV6 | |
1344 | case AF_INET6: | |
1345 | ipv6 = (struct sockaddr_in6 *)arg; | |
1346 | if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL) | |
1347 | return(NULL); | |
fc7f7735 | 1348 | ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port)); |
d3372da9 | 1349 | break; |
1350 | #endif | |
1351 | default: | |
1352 | errno = EPFNOSUPPORT; | |
1353 | break; | |
1354 | } | |
1355 | return(ret); | |
1356 | } | |
1357 | ||
1358 | #if 0 | |
1359 | ||
1360 | /* | |
1361 | * It was very nice to use this, but it seems | |
1362 | * to mess things up, so I guess it has to go... :-( | |
1363 | */ | |
1364 | ||
1365 | static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args) | |
1366 | { | |
1367 | struct sockaddr *arg; | |
1368 | socklen_t arglen; | |
1369 | struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with | |
1370 | * lowercase letters to 1, so I do this | |
1371 | * instead. */ | |
1372 | struct sockaddr_in *ipv4; | |
1373 | int ret; | |
1374 | ||
1375 | arg = *(struct sockaddr **)(args[0]); | |
1376 | arglen = *(socklen_t *)(args[1]); | |
1377 | switch(arg->sa_family) | |
1378 | { | |
1379 | case AF_UNIX: | |
1380 | UNIX = (struct sockaddr_un *)arg; | |
1381 | ret = fprintf(stream, "%s", UNIX->sun_path); | |
1382 | break; | |
1383 | case AF_INET: | |
1384 | ipv4 = (struct sockaddr_in *)arg; | |
1385 | ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port)); | |
1386 | break; | |
1387 | default: | |
1388 | ret = -1; | |
1389 | errno = EPFNOSUPPORT; | |
1390 | break; | |
1391 | } | |
1392 | return(ret); | |
1393 | } | |
1394 | ||
1395 | static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes) | |
1396 | { | |
1397 | if(n > 0) | |
1398 | argtypes[0] = PA_POINTER; | |
1399 | if(n > 1) | |
1400 | argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_ | |
1401 | * be an int, so I guess this should be | |
1402 | * safe. */ | |
1403 | return(2); | |
1404 | } | |
1405 | #endif | |
1406 | ||
1407 | static int init(int hup) | |
1408 | { | |
1409 | if(!hup) | |
1410 | { | |
1411 | /* | |
1412 | if(register_printf_function('N', formataddress, formataddress_arginfo)) | |
1413 | { | |
1414 | flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno)); | |
1415 | return(1); | |
1416 | } | |
1417 | */ | |
1418 | } | |
1419 | return(0); | |
1420 | } | |
1421 | ||
1422 | static void terminate(void) | |
1423 | { | |
1424 | while(sockets != NULL) | |
1425 | unlinksock(sockets); | |
1426 | } | |
1427 | ||
1428 | static struct module me = | |
1429 | { | |
1430 | .name = "net", | |
1431 | .conf = | |
1432 | { | |
1433 | .vars = myvars | |
1434 | }, | |
1435 | .init = init, | |
1436 | .terminate = terminate | |
1437 | }; | |
1438 | ||
1439 | MODULE(me) |