Commit | Line | Data |
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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> | |
72a7835e | 31 | #include <sys/select.h> |
d3372da9 | 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)); | |
c7ff7e93 | 175 | memset(new, 0, sizeof(*new)); |
d3372da9 | 176 | new->refcount = 2; |
177 | new->fd = -1; | |
178 | new->isrealsocket = 1; | |
179 | new->family = -1; | |
180 | new->tos = 0; | |
181 | new->type = type; | |
182 | new->state = -1; | |
183 | new->ignread = 0; | |
184 | new->close = 0; | |
185 | new->remote = NULL; | |
186 | new->remotelen = 0; | |
a8c5ada6 | 187 | new->ucred.uid = -1; |
188 | new->ucred.gid = -1; | |
d3372da9 | 189 | switch(type) |
190 | { | |
191 | case SOCK_STREAM: | |
192 | new->outbuf.s.buf = NULL; | |
193 | new->outbuf.s.bufsize = 0; | |
194 | new->outbuf.s.datasize = 0; | |
195 | new->inbuf.s.buf = NULL; | |
196 | new->inbuf.s.bufsize = 0; | |
197 | new->inbuf.s.datasize = 0; | |
198 | break; | |
199 | case SOCK_DGRAM: | |
200 | new->outbuf.d.f = new->outbuf.d.l = NULL; | |
201 | new->inbuf.d.f = new->inbuf.d.l = NULL; | |
202 | break; | |
203 | } | |
cab0b442 | 204 | new->conncb = NULL; |
205 | new->errcb = NULL; | |
206 | new->readcb = NULL; | |
207 | new->writecb = NULL; | |
208 | new->acceptcb = NULL; | |
d3372da9 | 209 | new->next = sockets; |
210 | new->prev = NULL; | |
211 | if(sockets != NULL) | |
212 | sockets->prev = new; | |
213 | sockets = new; | |
214 | numsocks++; | |
215 | return(new); | |
216 | } | |
217 | ||
218 | static struct socket *mksock(int domain, int type) | |
219 | { | |
220 | int fd; | |
221 | struct socket *new; | |
222 | ||
223 | if((fd = socket(domain, type, 0)) < 0) | |
224 | { | |
225 | flog(LOG_CRIT, "could not create socket: %s", strerror(errno)); | |
226 | return(NULL); | |
227 | } | |
228 | new = newsock(type); | |
229 | new->fd = fd; | |
230 | new->family = domain; | |
231 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); | |
232 | return(new); | |
233 | } | |
234 | ||
235 | struct socket *wrapsock(int fd) | |
236 | { | |
237 | struct socket *new; | |
238 | ||
239 | new = newsock(SOCK_STREAM); | |
240 | new->fd = fd; | |
241 | new->state = SOCK_EST; | |
242 | new->isrealsocket = 0; | |
243 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); | |
244 | return(new); | |
245 | } | |
246 | ||
247 | static void unlinksock(struct socket *sk) | |
248 | { | |
249 | if(sk->prev != NULL) | |
250 | sk->prev->next = sk->next; | |
251 | if(sk->next != NULL) | |
252 | sk->next->prev = sk->prev; | |
253 | if(sk == sockets) | |
254 | sockets = sk->next; | |
255 | putsock(sk); | |
256 | numsocks--; | |
257 | } | |
258 | ||
259 | void getsock(struct socket *sk) | |
260 | { | |
261 | sk->refcount++; | |
262 | } | |
263 | ||
264 | void putsock(struct socket *sk) | |
265 | { | |
266 | struct dgrambuf *buf; | |
267 | ||
268 | if(--(sk->refcount) == 0) | |
269 | { | |
270 | switch(sk->type) | |
271 | { | |
272 | case SOCK_STREAM: | |
273 | if(sk->outbuf.s.buf != NULL) | |
274 | free(sk->outbuf.s.buf); | |
275 | if(sk->inbuf.s.buf != NULL) | |
276 | free(sk->inbuf.s.buf); | |
277 | break; | |
278 | case SOCK_DGRAM: | |
279 | while((buf = sk->outbuf.d.f) != NULL) | |
280 | { | |
281 | sk->outbuf.d.f = buf->next; | |
282 | free(buf->data); | |
161604ea | 283 | free(buf->addr); |
d3372da9 | 284 | free(buf); |
285 | } | |
286 | while((buf = sk->inbuf.d.f) != NULL) | |
287 | { | |
288 | sk->inbuf.d.f = buf->next; | |
289 | free(buf->data); | |
161604ea | 290 | free(buf->addr); |
d3372da9 | 291 | free(buf); |
292 | } | |
293 | break; | |
294 | } | |
b870805e | 295 | closesock(sk); |
d3372da9 | 296 | if(sk->remote != NULL) |
297 | free(sk->remote); | |
298 | free(sk); | |
299 | } | |
300 | } | |
301 | ||
336539c2 | 302 | void sockpushdata(struct socket *sk, void *buf, size_t size) |
303 | { | |
304 | switch(sk->type) | |
305 | { | |
306 | case SOCK_STREAM: | |
307 | sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + size, 1, 1); | |
308 | memmove(sk->inbuf.s.buf + size, sk->inbuf.s.buf, sk->inbuf.s.datasize); | |
309 | memcpy(sk->inbuf.s.buf, buf, size); | |
310 | sk->inbuf.s.datasize += size; | |
311 | break; | |
312 | case SOCK_DGRAM: | |
313 | /* XXX */ | |
314 | break; | |
315 | } | |
316 | return; | |
317 | } | |
318 | ||
d3372da9 | 319 | void *sockgetinbuf(struct socket *sk, size_t *size) |
320 | { | |
321 | void *buf; | |
322 | struct dgrambuf *dbuf; | |
323 | ||
324 | switch(sk->type) | |
325 | { | |
326 | case SOCK_STREAM: | |
327 | if((sk->inbuf.s.buf == NULL) || (sk->inbuf.s.datasize == 0)) | |
328 | { | |
329 | *size = 0; | |
330 | return(NULL); | |
331 | } | |
332 | buf = sk->inbuf.s.buf; | |
333 | *size = sk->inbuf.s.datasize; | |
334 | sk->inbuf.s.buf = NULL; | |
335 | sk->inbuf.s.bufsize = sk->inbuf.s.datasize = 0; | |
336 | return(buf); | |
337 | case SOCK_DGRAM: | |
338 | if((dbuf = sk->inbuf.d.f) == NULL) | |
339 | return(NULL); | |
340 | sk->inbuf.d.f = dbuf->next; | |
341 | if(dbuf->next == NULL) | |
342 | sk->inbuf.d.l = NULL; | |
343 | buf = dbuf->data; | |
344 | *size = dbuf->size; | |
345 | free(dbuf->addr); | |
346 | free(dbuf); | |
347 | return(buf); | |
348 | } | |
349 | return(NULL); | |
350 | } | |
351 | ||
9e5f2b29 | 352 | static void recvcmsg(struct socket *sk, struct msghdr *msg) |
353 | { | |
354 | struct cmsghdr *cmsg; | |
9e5f2b29 | 355 | |
356 | for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) | |
357 | { | |
a8c5ada6 | 358 | #if UNIX_AUTH_STYLE == 1 |
9e5f2b29 | 359 | if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS)) |
360 | { | |
a8c5ada6 | 361 | struct ucred *cred; |
362 | if(sk->ucred.uid == -1) | |
9e5f2b29 | 363 | { |
364 | cred = (struct ucred *)CMSG_DATA(cmsg); | |
a8c5ada6 | 365 | sk->ucred.uid = cred->uid; |
366 | sk->ucred.gid = cred->gid; | |
9e5f2b29 | 367 | } |
368 | } | |
a8c5ada6 | 369 | #endif |
9e5f2b29 | 370 | } |
371 | } | |
372 | ||
d3372da9 | 373 | static void sockrecv(struct socket *sk) |
374 | { | |
375 | int ret, inq; | |
376 | struct dgrambuf *dbuf; | |
9e5f2b29 | 377 | struct msghdr msg; |
378 | char cbuf[65536]; | |
379 | struct iovec bufvec; | |
d3372da9 | 380 | |
9e5f2b29 | 381 | memset(&msg, 0, sizeof(msg)); |
382 | msg.msg_iov = &bufvec; | |
383 | msg.msg_iovlen = 1; | |
384 | msg.msg_control = cbuf; | |
385 | msg.msg_controllen = sizeof(cbuf); | |
d3372da9 | 386 | switch(sk->type) |
387 | { | |
388 | case SOCK_STREAM: | |
389 | #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ) | |
390 | /* SIOCINQ is Linux-specific AFAIK, but I really have no idea | |
391 | * how to read the inqueue size on other OSs */ | |
dcf7a1a2 FT |
392 | if(sk->isrealsocket) { |
393 | if(ioctl(sk->fd, SIOCINQ, &inq)) | |
394 | { | |
395 | /* I don't really know what could go wrong here, so let's | |
396 | * assume it's transient. */ | |
397 | flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), sk->fd); | |
398 | inq = 2048; | |
399 | } | |
400 | } else { | |
401 | /* There are perils when trying to use SIOCINQ on files >2GiB... */ | |
402 | inq = 65536; | |
d3372da9 | 403 | } |
404 | #else | |
405 | inq = 2048; | |
406 | #endif | |
407 | if(inq > 65536) | |
408 | inq = 65536; | |
409 | sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + inq, 1, 1); | |
987518f8 | 410 | if(sk->isrealsocket) |
411 | { | |
412 | bufvec.iov_base = sk->inbuf.s.buf + sk->inbuf.s.datasize; | |
413 | bufvec.iov_len = inq; | |
414 | ret = recvmsg(sk->fd, &msg, 0); | |
415 | } else { | |
416 | ret = read(sk->fd, sk->inbuf.s.buf + sk->inbuf.s.datasize, inq); | |
417 | msg.msg_controllen = 0; | |
418 | msg.msg_flags = 0; | |
419 | } | |
d3372da9 | 420 | if(ret < 0) |
421 | { | |
422 | if((errno == EINTR) || (errno == EAGAIN)) | |
423 | return; | |
cab0b442 | 424 | if(sk->errcb != NULL) |
425 | sk->errcb(sk, errno, sk->data); | |
d3372da9 | 426 | closesock(sk); |
427 | return; | |
428 | } | |
9e5f2b29 | 429 | if(msg.msg_flags & MSG_CTRUNC) |
430 | flog(LOG_DEBUG, "ancillary data was truncated"); | |
431 | else | |
432 | recvcmsg(sk, &msg); | |
d3372da9 | 433 | if(ret == 0) |
434 | { | |
cab0b442 | 435 | if(sk->errcb != NULL) |
436 | sk->errcb(sk, 0, sk->data); | |
d3372da9 | 437 | closesock(sk); |
438 | return; | |
439 | } | |
440 | sk->inbuf.s.datasize += ret; | |
cab0b442 | 441 | if(sk->readcb != NULL) |
442 | sk->readcb(sk, sk->data); | |
d3372da9 | 443 | break; |
444 | case SOCK_DGRAM: | |
9e5f2b29 | 445 | #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ) |
d3372da9 | 446 | if(ioctl(sk->fd, SIOCINQ, &inq)) |
447 | { | |
448 | /* I don't really know what could go wrong here, so let's | |
449 | * assume it's transient. */ | |
450 | flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), sk->fd); | |
451 | return; | |
452 | } | |
9e5f2b29 | 453 | #else |
454 | inq = 65536; | |
455 | #endif | |
d3372da9 | 456 | dbuf = smalloc(sizeof(*dbuf)); |
457 | dbuf->data = smalloc(inq); | |
458 | dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage)); | |
9e5f2b29 | 459 | /* |
d3372da9 | 460 | ret = recvfrom(sk->fd, dbuf->data, inq, 0, dbuf->addr, &dbuf->addrlen); |
9e5f2b29 | 461 | */ |
462 | msg.msg_name = dbuf->addr; | |
463 | msg.msg_namelen = dbuf->addrlen; | |
464 | bufvec.iov_base = dbuf->data; | |
465 | bufvec.iov_len = inq; | |
466 | ret = recvmsg(sk->fd, &msg, 0); | |
467 | dbuf->addrlen = msg.msg_namelen; | |
d3372da9 | 468 | if(ret < 0) |
469 | { | |
470 | free(dbuf->addr); | |
471 | free(dbuf->data); | |
472 | free(dbuf); | |
473 | if((errno == EINTR) || (errno == EAGAIN)) | |
474 | return; | |
cab0b442 | 475 | if(sk->errcb != NULL) |
476 | sk->errcb(sk, errno, sk->data); | |
d3372da9 | 477 | closesock(sk); |
478 | return; | |
479 | } | |
9e5f2b29 | 480 | if(msg.msg_flags & MSG_CTRUNC) |
481 | flog(LOG_DEBUG, "ancillary data was truncated"); | |
482 | else | |
483 | recvcmsg(sk, &msg); | |
d3372da9 | 484 | /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't |
485 | * have EOF), but rather an empty packet. I don't know if any | |
486 | * other potential DGRAM protocols might have an EOF | |
487 | * condition, so let's play safe. */ | |
488 | if(ret == 0) | |
489 | { | |
490 | free(dbuf->addr); | |
491 | free(dbuf->data); | |
492 | free(dbuf); | |
493 | if(!((sk->family == AF_INET) || (sk->family == AF_INET6))) | |
494 | { | |
cab0b442 | 495 | if(sk->errcb != NULL) |
496 | sk->errcb(sk, 0, sk->data); | |
d3372da9 | 497 | closesock(sk); |
498 | } | |
499 | return; | |
500 | } | |
501 | dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen); | |
502 | dbuf->data = srealloc(dbuf->data, dbuf->size = ret); | |
503 | dbuf->next = NULL; | |
504 | if(sk->inbuf.d.l != NULL) | |
505 | sk->inbuf.d.l->next = dbuf; | |
506 | else | |
507 | sk->inbuf.d.f = dbuf; | |
508 | sk->inbuf.d.l = dbuf; | |
cab0b442 | 509 | if(sk->readcb != NULL) |
510 | sk->readcb(sk, sk->data); | |
d3372da9 | 511 | break; |
512 | } | |
513 | } | |
514 | ||
515 | static void sockflush(struct socket *sk) | |
516 | { | |
517 | int ret; | |
518 | struct dgrambuf *dbuf; | |
519 | ||
520 | switch(sk->type) | |
521 | { | |
522 | case SOCK_STREAM: | |
523 | if(sk->isrealsocket) | |
524 | ret = send(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL); | |
525 | else | |
526 | ret = write(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize); | |
527 | if(ret < 0) | |
528 | { | |
c7ff7e93 FT |
529 | if((errno != EINTR) && (errno != EAGAIN)) |
530 | { | |
531 | if(sk->errcb != NULL) | |
532 | sk->errcb(sk, errno, sk->data); | |
533 | closesock(sk); | |
534 | } | |
d3372da9 | 535 | break; |
536 | } | |
537 | if(ret > 0) | |
538 | { | |
539 | memmove(sk->outbuf.s.buf, ((char *)sk->outbuf.s.buf) + ret, sk->outbuf.s.datasize -= ret); | |
cab0b442 | 540 | if(sk->writecb != NULL) |
541 | sk->writecb(sk, sk->data); | |
d3372da9 | 542 | } |
543 | break; | |
544 | case SOCK_DGRAM: | |
545 | dbuf = sk->outbuf.d.f; | |
546 | if((sk->outbuf.d.f = dbuf->next) == NULL) | |
547 | sk->outbuf.d.l = NULL; | |
548 | sendto(sk->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen); | |
549 | free(dbuf->data); | |
550 | free(dbuf->addr); | |
551 | free(dbuf); | |
cab0b442 | 552 | if(sk->writecb != NULL) |
553 | sk->writecb(sk, sk->data); | |
d3372da9 | 554 | break; |
555 | } | |
556 | } | |
557 | ||
558 | void closesock(struct socket *sk) | |
559 | { | |
b870805e | 560 | struct sockaddr_un *un; |
561 | ||
e0cbc756 | 562 | if((sk->family == AF_UNIX) && !sockgetlocalname(sk, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX)) |
b870805e | 563 | { |
7ab36fbd | 564 | if((sk->state == SOCK_LST) && strchr(un->sun_path, '/')) |
b870805e | 565 | { |
566 | if(unlink(un->sun_path)) | |
7ab36fbd | 567 | flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno)); |
b870805e | 568 | } |
569 | } | |
d3372da9 | 570 | sk->state = SOCK_STL; |
571 | close(sk->fd); | |
572 | sk->fd = -1; | |
573 | sk->close = 0; | |
574 | } | |
575 | ||
576 | void sockqueue(struct socket *sk, void *data, size_t size) | |
577 | { | |
578 | struct dgrambuf *new; | |
579 | ||
580 | if(sk->state == SOCK_STL) | |
581 | return; | |
582 | switch(sk->type) | |
583 | { | |
584 | case SOCK_STREAM: | |
585 | sizebuf(&(sk->outbuf.s.buf), &(sk->outbuf.s.bufsize), sk->outbuf.s.datasize + size, 1, 1); | |
586 | memcpy(sk->outbuf.s.buf + sk->outbuf.s.datasize, data, size); | |
587 | sk->outbuf.s.datasize += size; | |
588 | break; | |
589 | case SOCK_DGRAM: | |
590 | if(sk->remote == NULL) | |
591 | return; | |
592 | new = smalloc(sizeof(*new)); | |
593 | new->next = NULL; | |
594 | memcpy(new->data = smalloc(size), data, new->size = size); | |
595 | memcpy(new->addr = smalloc(sk->remotelen), sk->remote, new->addrlen = sk->remotelen); | |
596 | if(sk->outbuf.d.l == NULL) | |
597 | { | |
598 | sk->outbuf.d.l = sk->outbuf.d.f = new; | |
599 | } else { | |
600 | sk->outbuf.d.l->next = new; | |
601 | sk->outbuf.d.l = new; | |
602 | } | |
603 | break; | |
604 | } | |
605 | } | |
606 | ||
607 | size_t sockgetdatalen(struct socket *sk) | |
608 | { | |
609 | struct dgrambuf *b; | |
610 | size_t ret; | |
611 | ||
612 | switch(sk->type) | |
613 | { | |
614 | case SOCK_STREAM: | |
615 | ret = sk->inbuf.s.datasize; | |
616 | break; | |
617 | case SOCK_DGRAM: | |
618 | ret = 0; | |
619 | for(b = sk->inbuf.d.f; b != NULL; b = b->next) | |
620 | ret += b->size; | |
621 | break; | |
622 | } | |
623 | return(ret); | |
624 | } | |
625 | ||
626 | size_t sockqueuesize(struct socket *sk) | |
627 | { | |
628 | struct dgrambuf *b; | |
629 | size_t ret; | |
630 | ||
631 | switch(sk->type) | |
632 | { | |
633 | case SOCK_STREAM: | |
634 | ret = sk->outbuf.s.datasize; | |
635 | break; | |
636 | case SOCK_DGRAM: | |
637 | ret = 0; | |
638 | for(b = sk->outbuf.d.f; b != NULL; b = b->next) | |
639 | ret += b->size; | |
640 | break; | |
641 | } | |
642 | return(ret); | |
643 | } | |
644 | ||
d3372da9 | 645 | /* |
7ab36fbd | 646 | * Seriously, I don't know if it's naughty or not to remove |
647 | * pre-existing Unix sockets. | |
648 | */ | |
649 | static int rebindunix(struct socket *sk, struct sockaddr *name, socklen_t namelen) | |
650 | { | |
651 | struct sockaddr_un *un; | |
652 | struct stat sb; | |
653 | ||
654 | if((sk->family != AF_UNIX) || (name->sa_family != PF_UNIX)) | |
655 | return(-1); | |
656 | un = (struct sockaddr_un *)name; | |
657 | if(stat(un->sun_path, &sb)) | |
658 | return(-1); | |
659 | if(!S_ISSOCK(sb.st_mode)) | |
660 | return(-1); | |
661 | if(unlink(un->sun_path)) | |
662 | return(-1); | |
663 | if(bind(sk->fd, name, namelen) < 0) | |
664 | return(-1); | |
665 | return(0); | |
666 | } | |
667 | ||
668 | /* | |
d3372da9 | 669 | * The difference between netcslisten() and netcslistenlocal() is that |
670 | * netcslistenlocal() always listens on the local host, instead of | |
671 | * following proxy/passive mode directions. It is suitable for eg. the | |
672 | * UI channel, while the file sharing networks should, naturally, use | |
673 | * netcslisten() instead. | |
674 | */ | |
675 | ||
cab0b442 | 676 | struct socket *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data) |
d3372da9 | 677 | { |
678 | struct socket *sk; | |
66c517d2 | 679 | int intbuf; |
d3372da9 | 680 | |
681 | /* I don't know if this is actually correct (it probably isn't), | |
682 | * but since, at on least Linux systems, PF_* are specifically | |
683 | * #define'd to their AF_* counterparts, it allows for a severely | |
684 | * smoother implementation. If it breaks something on your | |
685 | * platform, please tell me so. | |
686 | */ | |
687 | if((sk = mksock(name->sa_family, type)) == NULL) | |
688 | return(NULL); | |
689 | sk->state = SOCK_LST; | |
687b2ee2 | 690 | if(confgetint("net", "reuseaddr")) |
691 | { | |
692 | intbuf = 1; | |
693 | setsockopt(sk->fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf)); | |
694 | } | |
7ab36fbd | 695 | if((bind(sk->fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(sk, name, namelen) < 0))) |
d3372da9 | 696 | { |
697 | putsock(sk); | |
698 | return(NULL); | |
699 | } | |
700 | if(listen(sk->fd, 16) < 0) | |
701 | { | |
702 | putsock(sk); | |
703 | return(NULL); | |
704 | } | |
cab0b442 | 705 | sk->acceptcb = func; |
706 | sk->data = data; | |
d3372da9 | 707 | return(sk); |
708 | } | |
709 | ||
cab0b442 | 710 | struct socket *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data) |
c23acc61 | 711 | { |
712 | if(confgetint("net", "mode") == 1) | |
713 | { | |
714 | errno = EOPNOTSUPP; | |
715 | return(NULL); | |
716 | } | |
c23acc61 | 717 | if(confgetint("net", "mode") == 0) |
718 | return(netcslistenlocal(type, name, namelen, func, data)); | |
719 | errno = EOPNOTSUPP; | |
720 | return(NULL); | |
721 | } | |
722 | ||
cab0b442 | 723 | struct socket *netcstcplisten(int port, int local, void (*func)(struct socket *, struct socket *, void *), void *data) |
0a1bc5b1 | 724 | { |
725 | struct sockaddr_in addr; | |
726 | #ifdef HAVE_IPV6 | |
727 | struct sockaddr_in6 addr6; | |
728 | #endif | |
cab0b442 | 729 | struct socket *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct socket *, struct socket *, void *), void *); |
0a1bc5b1 | 730 | struct socket *ret; |
731 | ||
732 | if(local) | |
733 | csfunc = netcslistenlocal; | |
734 | else | |
735 | csfunc = netcslisten; | |
736 | #ifdef HAVE_IPV6 | |
737 | memset(&addr6, 0, sizeof(addr6)); | |
738 | addr6.sin6_family = AF_INET6; | |
739 | addr6.sin6_port = htons(port); | |
740 | addr6.sin6_addr = in6addr_any; | |
741 | if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL) | |
742 | return(ret); | |
743 | if((ret == NULL) && (errno != EAFNOSUPPORT)) | |
744 | return(NULL); | |
745 | #endif | |
746 | memset(&addr, 0, sizeof(addr)); | |
747 | addr.sin_family = AF_INET; | |
748 | addr.sin_port = htons(port); | |
749 | return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data)); | |
750 | } | |
751 | ||
d3372da9 | 752 | struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen) |
753 | { | |
754 | struct socket *sk; | |
755 | int mode; | |
756 | ||
757 | mode = confgetint("net", "mode"); | |
758 | if((mode == 0) || (mode == 1)) | |
759 | { | |
760 | if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL) | |
761 | return(NULL); | |
762 | if(bind(sk->fd, name, namelen) < 0) | |
763 | { | |
764 | putsock(sk); | |
765 | return(NULL); | |
766 | } | |
767 | sk->state = SOCK_EST; | |
768 | return(sk); | |
769 | } | |
770 | errno = EOPNOTSUPP; | |
771 | return(NULL); | |
772 | } | |
773 | ||
774 | struct socket *netdupsock(struct socket *sk) | |
775 | { | |
776 | struct socket *newsk; | |
777 | ||
778 | newsk = newsock(sk->type); | |
779 | if((newsk->fd = dup(sk->fd)) < 0) | |
780 | { | |
781 | flog(LOG_WARNING, "could not dup() socket: %s", strerror(errno)); | |
782 | putsock(newsk); | |
783 | return(NULL); | |
784 | } | |
785 | newsk->state = sk->state; | |
786 | newsk->ignread = sk->ignread; | |
787 | if(sk->remote != NULL) | |
788 | memcpy(newsk->remote = smalloc(sk->remotelen), sk->remote, newsk->remotelen = sk->remotelen); | |
789 | return(newsk); | |
790 | } | |
791 | ||
792 | void netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen) | |
793 | { | |
794 | if(sk->remote != NULL) | |
795 | free(sk->remote); | |
796 | memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen); | |
797 | sk->ignread = 1; | |
798 | } | |
799 | ||
cab0b442 | 800 | struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data) |
d3372da9 | 801 | { |
802 | struct socket *sk; | |
803 | int mode; | |
804 | ||
805 | mode = confgetint("net", "mode"); | |
806 | if((mode == 0) || (mode == 1)) | |
807 | { | |
808 | if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL) | |
809 | return(NULL); | |
810 | memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen); | |
811 | if(!connect(sk->fd, addr, addrlen)) | |
812 | { | |
813 | sk->state = SOCK_EST; | |
814 | func(sk, 0, data); | |
815 | return(sk); | |
816 | } | |
817 | if(errno == EINPROGRESS) | |
818 | { | |
819 | sk->state = SOCK_SYN; | |
cab0b442 | 820 | sk->conncb = func; |
821 | sk->data = data; | |
d3372da9 | 822 | return(sk); |
823 | } | |
824 | putsock(sk); | |
825 | return(NULL); | |
826 | } | |
827 | errno = EOPNOTSUPP; | |
828 | return(NULL); | |
829 | } | |
830 | ||
9e5f2b29 | 831 | static void acceptunix(struct socket *sk) |
832 | { | |
833 | int buf; | |
834 | ||
835 | buf = 1; | |
a8c5ada6 | 836 | #if UNIX_AUTH_STYLE == 1 |
9e5f2b29 | 837 | if(setsockopt(sk->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0) |
838 | flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", sk->fd, strerror(errno)); | |
a8c5ada6 | 839 | #elif UNIX_AUTH_STYLE == 2 |
840 | if(getpeereid(sk->fd, &sk->ucred.uid, &sk->ucred.gid) < 0) | |
841 | { | |
842 | flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", sk->fd, strerror(errno)); | |
843 | sk->ucred.uid = -1; | |
844 | sk->ucred.gid = -1; | |
845 | } | |
846 | #endif | |
9e5f2b29 | 847 | } |
848 | ||
d3372da9 | 849 | int pollsocks(int timeout) |
850 | { | |
72a7835e | 851 | int ret, fd; |
eaa35963 | 852 | socklen_t retlen; |
72a7835e FT |
853 | int newfd, maxfd; |
854 | fd_set rfds, wfds, efds; | |
d3372da9 | 855 | struct socket *sk, *next, *newsk; |
856 | struct sockaddr_storage ss; | |
857 | socklen_t sslen; | |
72a7835e | 858 | struct timeval tv; |
d3372da9 | 859 | |
72a7835e FT |
860 | FD_ZERO(&rfds); |
861 | FD_ZERO(&wfds); | |
862 | FD_ZERO(&efds); | |
863 | for(maxfd = 0, sk = sockets; sk != NULL; sk = sk->next) | |
d3372da9 | 864 | { |
72a7835e | 865 | if((sk->state == SOCK_STL) || (sk->fd < 0)) |
d3372da9 | 866 | continue; |
d3372da9 | 867 | if(!sk->ignread) |
72a7835e | 868 | FD_SET(sk->fd, &rfds); |
d3372da9 | 869 | if((sk->state == SOCK_SYN) || (sockqueuesize(sk) > 0)) |
72a7835e FT |
870 | FD_SET(sk->fd, &wfds); |
871 | FD_SET(sk->fd, &efds); | |
872 | if(sk->fd > maxfd) | |
873 | maxfd = sk->fd; | |
d3372da9 | 874 | } |
72a7835e FT |
875 | tv.tv_sec = timeout / 1000; |
876 | tv.tv_usec = (timeout % 1000) * 1000; | |
877 | ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv); | |
d3372da9 | 878 | if(ret < 0) |
879 | { | |
880 | if(errno != EINTR) | |
881 | { | |
72a7835e | 882 | flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno)); |
d3372da9 | 883 | /* To avoid CPU hogging in case it's bad, which it |
884 | * probably is. */ | |
885 | sleep(1); | |
886 | } | |
d3372da9 | 887 | return(1); |
888 | } | |
889 | for(sk = sockets; sk != NULL; sk = next) | |
890 | { | |
891 | next = sk->next; | |
72a7835e | 892 | fd = sk->fd; |
d3372da9 | 893 | switch(sk->state) |
894 | { | |
895 | case SOCK_LST: | |
72a7835e | 896 | if(FD_ISSET(fd, &rfds)) |
d3372da9 | 897 | { |
898 | sslen = sizeof(ss); | |
72a7835e | 899 | if((newfd = accept(fd, (struct sockaddr *)&ss, &sslen)) < 0) |
cab0b442 | 900 | { |
901 | if(sk->errcb != NULL) | |
902 | sk->errcb(sk, errno, sk->data); | |
903 | } | |
d3372da9 | 904 | newsk = newsock(sk->type); |
905 | newsk->fd = newfd; | |
906 | newsk->family = sk->family; | |
907 | newsk->state = SOCK_EST; | |
908 | memcpy(newsk->remote = smalloc(sslen), &ss, sslen); | |
909 | newsk->remotelen = sslen; | |
9e5f2b29 | 910 | if(ss.ss_family == PF_UNIX) |
911 | acceptunix(newsk); | |
cab0b442 | 912 | if(sk->acceptcb != NULL) |
913 | sk->acceptcb(sk, newsk, sk->data); | |
9e5f2b29 | 914 | putsock(newsk); |
d3372da9 | 915 | } |
72a7835e | 916 | if(FD_ISSET(fd, &efds)) |
d3372da9 | 917 | { |
918 | retlen = sizeof(ret); | |
72a7835e | 919 | getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); |
cab0b442 | 920 | if(sk->errcb != NULL) |
921 | sk->errcb(sk, ret, sk->data); | |
d3372da9 | 922 | continue; |
923 | } | |
924 | break; | |
925 | case SOCK_SYN: | |
72a7835e | 926 | if(FD_ISSET(fd, &efds)) |
d3372da9 | 927 | { |
928 | retlen = sizeof(ret); | |
72a7835e | 929 | getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); |
cab0b442 | 930 | if(sk->conncb != NULL) |
931 | sk->conncb(sk, ret, sk->data); | |
d3372da9 | 932 | closesock(sk); |
933 | continue; | |
934 | } | |
72a7835e | 935 | if(FD_ISSET(fd, &rfds) || FD_ISSET(fd, &wfds)) |
d3372da9 | 936 | { |
937 | sk->state = SOCK_EST; | |
cab0b442 | 938 | if(sk->conncb != NULL) |
939 | sk->conncb(sk, 0, sk->data); | |
d3372da9 | 940 | } |
941 | break; | |
942 | case SOCK_EST: | |
72a7835e | 943 | if(FD_ISSET(fd, &efds)) |
d3372da9 | 944 | { |
945 | retlen = sizeof(ret); | |
72a7835e | 946 | getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); |
cab0b442 | 947 | if(sk->errcb != NULL) |
948 | sk->errcb(sk, ret, sk->data); | |
d3372da9 | 949 | closesock(sk); |
950 | continue; | |
951 | } | |
72a7835e | 952 | if(FD_ISSET(fd, &rfds)) |
d3372da9 | 953 | sockrecv(sk); |
72a7835e | 954 | if(FD_ISSET(fd, &wfds)) |
d3372da9 | 955 | { |
956 | if(sockqueuesize(sk) > 0) | |
957 | sockflush(sk); | |
958 | } | |
959 | break; | |
960 | } | |
d3372da9 | 961 | } |
d3372da9 | 962 | for(sk = sockets; sk != NULL; sk = next) |
963 | { | |
964 | next = sk->next; | |
965 | if(sk->refcount == 1 && (sockqueuesize(sk) == 0)) | |
966 | { | |
967 | unlinksock(sk); | |
968 | continue; | |
969 | } | |
970 | if(sk->close && (sockqueuesize(sk) == 0)) | |
971 | closesock(sk); | |
972 | if(sk->state == SOCK_STL) | |
973 | { | |
974 | unlinksock(sk); | |
975 | continue; | |
976 | } | |
977 | } | |
978 | return(1); | |
979 | } | |
980 | ||
981 | int socksettos(struct socket *sk, int tos) | |
982 | { | |
b020fb3d | 983 | int buf; |
984 | ||
7ab36fbd | 985 | if(sk->family == AF_UNIX) |
986 | return(0); /* Unix sockets are always perfect. :) */ | |
d3372da9 | 987 | if(sk->family == AF_INET) |
988 | { | |
b020fb3d | 989 | switch(tos) |
990 | { | |
b198bed6 | 991 | case 0: |
992 | buf = 0; | |
993 | break; | |
b020fb3d | 994 | case SOCK_TOS_MINCOST: |
18c1ae1d | 995 | buf = 0x02; |
b020fb3d | 996 | break; |
997 | case SOCK_TOS_MAXREL: | |
18c1ae1d | 998 | buf = 0x04; |
b020fb3d | 999 | break; |
1000 | case SOCK_TOS_MAXTP: | |
18c1ae1d | 1001 | buf = 0x08; |
b020fb3d | 1002 | break; |
1003 | case SOCK_TOS_MINDELAY: | |
18c1ae1d | 1004 | buf = 0x10; |
b020fb3d | 1005 | break; |
1006 | default: | |
1007 | flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos); | |
1008 | return(-1); | |
1009 | } | |
e03e1e7c | 1010 | if(setsockopt(sk->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0) |
d3372da9 | 1011 | { |
1012 | flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno)); | |
1013 | return(-1); | |
1014 | } | |
1015 | return(0); | |
1016 | } | |
b020fb3d | 1017 | if(sk->family == AF_INET6) |
1018 | { | |
1019 | switch(tos) | |
1020 | { | |
b198bed6 | 1021 | case 0: |
1022 | buf = 0; | |
b020fb3d | 1023 | case SOCK_TOS_MINCOST: |
1024 | buf = confgetint("net", "diffserv-mincost"); | |
1025 | break; | |
1026 | case SOCK_TOS_MAXREL: | |
1027 | buf = confgetint("net", "diffserv-maxrel"); | |
1028 | break; | |
1029 | case SOCK_TOS_MAXTP: | |
1030 | buf = confgetint("net", "diffserv-maxtp"); | |
1031 | break; | |
1032 | case SOCK_TOS_MINDELAY: | |
1033 | buf = confgetint("net", "diffserv-mindelay"); | |
1034 | break; | |
1035 | default: | |
1036 | flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos); | |
1037 | return(-1); | |
1038 | } | |
1039 | /* | |
1040 | On Linux, the API IPv6 flow label management doesn't seem to | |
1041 | be entirely complete, so I guess this will have to wait. | |
1042 | ||
1043 | if(setsockopt(...) < 0) | |
1044 | { | |
1045 | flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno)); | |
1046 | return(-1); | |
1047 | } | |
1048 | */ | |
1049 | return(0); | |
1050 | } | |
d3372da9 | 1051 | flog(LOG_WARNING, "could not set TOS on sock of family %i", sk->family); |
1052 | return(1); | |
1053 | } | |
1054 | ||
1055 | struct resolvedata | |
1056 | { | |
1057 | int fd; | |
1058 | void (*callback)(struct sockaddr *addr, int addrlen, void *data); | |
1059 | void *data; | |
1060 | struct sockaddr_storage addr; | |
1061 | int addrlen; | |
1062 | }; | |
1063 | ||
1064 | static void resolvecb(pid_t pid, int status, struct resolvedata *data) | |
1065 | { | |
1066 | static char buf[80]; | |
1067 | int ret; | |
1068 | struct sockaddr_in *ipv4; | |
1069 | ||
1070 | if(!status) | |
1071 | { | |
1072 | if((ret = read(data->fd, buf, sizeof(buf))) != 4) | |
1073 | { | |
b4d16e90 | 1074 | errno = ENOENT; |
d3372da9 | 1075 | data->callback(NULL, 0, data->data); |
1076 | } else { | |
1077 | ipv4 = (struct sockaddr_in *)&data->addr; | |
1078 | memcpy(&ipv4->sin_addr, buf, 4); | |
1079 | data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data); | |
1080 | } | |
1081 | } else { | |
b4d16e90 | 1082 | errno = ENOENT; |
d3372da9 | 1083 | data->callback(NULL, 0, data->data); |
1084 | } | |
1085 | close(data->fd); | |
1086 | free(data); | |
1087 | } | |
1088 | ||
1089 | int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data) | |
1090 | { | |
1091 | int i; | |
1092 | char *p; | |
1093 | int port; | |
1094 | int pfd[2]; | |
1095 | pid_t child; | |
1096 | struct resolvedata *rdata; | |
1097 | struct sockaddr_in ipv4; | |
1098 | struct hostent *he; | |
1099 | sigset_t sigset; | |
1100 | ||
1101 | /* IPv4 */ | |
1102 | port = -1; | |
1103 | if((p = strchr(addr, ':')) != NULL) | |
1104 | { | |
1105 | *p = 0; | |
1106 | port = atoi(p + 1); | |
1107 | } | |
1108 | ipv4.sin_family = AF_INET; | |
1109 | ipv4.sin_port = htons(port); | |
1110 | if(inet_aton(addr, &ipv4.sin_addr)) | |
1111 | { | |
1112 | callback((struct sockaddr *)&ipv4, sizeof(ipv4), data); | |
1113 | } else { | |
1114 | sigemptyset(&sigset); | |
1115 | sigaddset(&sigset, SIGCHLD); | |
1116 | sigprocmask(SIG_BLOCK, &sigset, NULL); | |
1117 | if((pipe(pfd) < 0) || ((child = fork()) < 0)) | |
1118 | { | |
1119 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); | |
1120 | return(-1); | |
1121 | } | |
1122 | if(child == 0) | |
1123 | { | |
1124 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); | |
1125 | for(i = 3; i < FD_SETSIZE; i++) | |
1126 | { | |
1127 | if(i != pfd[1]) | |
1128 | close(i); | |
1129 | } | |
1130 | signal(SIGALRM, SIG_DFL); | |
1131 | alarm(30); | |
1132 | if((he = gethostbyname(addr)) == NULL) | |
1133 | exit(1); | |
1134 | write(pfd[1], he->h_addr_list[0], 4); | |
1135 | exit(0); | |
1136 | } else { | |
1137 | close(pfd[1]); | |
1138 | fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK); | |
1139 | rdata = smalloc(sizeof(*rdata)); | |
1140 | rdata->fd = pfd[0]; | |
1141 | rdata->callback = callback; | |
1142 | rdata->data = data; | |
1143 | memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4)); | |
1144 | childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata); | |
1145 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); | |
1146 | return(1); | |
1147 | } | |
1148 | } | |
1149 | return(0); | |
1150 | } | |
1151 | ||
1152 | int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf) | |
1153 | { | |
1154 | socklen_t len; | |
1155 | struct sockaddr_storage name; | |
1156 | ||
1157 | *namebuf = NULL; | |
1158 | if((sk->state == SOCK_STL) || (sk->fd < 0)) | |
1159 | return(-1); | |
1160 | len = sizeof(name); | |
1161 | if(getsockname(sk->fd, (struct sockaddr *)&name, &len) < 0) | |
1162 | { | |
6fb0c6ac | 1163 | flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno)); |
d3372da9 | 1164 | return(-1); |
1165 | } | |
1166 | *namebuf = memcpy(smalloc(len), &name, len); | |
b870805e | 1167 | if(lenbuf != NULL) |
1168 | *lenbuf = len; | |
d3372da9 | 1169 | return(0); |
1170 | } | |
1171 | ||
eaa35963 | 1172 | static void sethostaddr(struct sockaddr *dst, struct sockaddr *src) |
1173 | { | |
1174 | if(dst->sa_family != src->sa_family) | |
1175 | { | |
1176 | flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family); | |
1177 | return; | |
1178 | } | |
1179 | switch(src->sa_family) | |
1180 | { | |
1181 | case AF_INET: | |
1182 | ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr; | |
1183 | break; | |
1184 | case AF_INET6: | |
1185 | ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr; | |
1186 | break; | |
1187 | default: | |
1188 | flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family); | |
1189 | break; | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | static int makepublic(struct sockaddr *addr) | |
d3372da9 | 1194 | { |
6fb0c6ac | 1195 | int ret; |
eaa35963 | 1196 | socklen_t plen; |
1197 | struct sockaddr *pname; | |
1198 | ||
1199 | if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0) | |
1200 | { | |
1201 | flog(LOG_ERR, "could not get public address: %s", strerror(errno)); | |
1202 | return(-1); | |
1203 | } | |
1204 | if(ret) | |
1205 | return(0); | |
1206 | sethostaddr(addr, pname); | |
1207 | free(pname); | |
1208 | return(0); | |
1209 | } | |
1210 | ||
1211 | int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf) | |
1212 | { | |
d3372da9 | 1213 | socklen_t len; |
6fb0c6ac | 1214 | struct sockaddr *name; |
d3372da9 | 1215 | |
1216 | switch(confgetint("net", "mode")) | |
1217 | { | |
1218 | case 0: | |
1219 | *namebuf = NULL; | |
1220 | if((sk->state == SOCK_STL) || (sk->fd < 0)) | |
d3372da9 | 1221 | { |
eaa35963 | 1222 | errno = EBADF; |
d3372da9 | 1223 | return(-1); |
1224 | } | |
6fb0c6ac | 1225 | if(!sockgetlocalname(sk, &name, &len)) |
1226 | { | |
1227 | *namebuf = name; | |
1228 | *lenbuf = len; | |
eaa35963 | 1229 | makepublic(name); |
6fb0c6ac | 1230 | return(0); |
1231 | } | |
1232 | flog(LOG_ERR, "could not get remotely accessible name by any means"); | |
1233 | return(-1); | |
d3372da9 | 1234 | case 1: |
1235 | errno = EOPNOTSUPP; | |
1236 | return(-1); | |
1237 | default: | |
1238 | flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode")); | |
1239 | errno = EOPNOTSUPP; | |
1240 | return(-1); | |
1241 | } | |
1242 | } | |
1243 | ||
d29853b1 | 1244 | int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf) |
1245 | { | |
1246 | struct sockaddr *name1, *name2; | |
1247 | socklen_t len1, len2; | |
1248 | ||
1249 | if(sk->family != sk2->family) | |
1250 | { | |
1251 | flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", sk->family, sk2->family); | |
1252 | return(-1); | |
1253 | } | |
3804379d | 1254 | if(sockgetremotename(sk, &name1, &len1)) |
d29853b1 | 1255 | return(-1); |
3804379d | 1256 | if(sockgetremotename(sk2, &name2, &len2)) { |
d29853b1 | 1257 | free(name1); |
1258 | return(-1); | |
1259 | } | |
1260 | sethostaddr(name1, name2); | |
1261 | free(name2); | |
1262 | *namebuf = name1; | |
1263 | *lenbuf = len1; | |
1264 | return(0); | |
1265 | } | |
1266 | ||
99a28d47 | 1267 | int addreq(struct sockaddr *x, struct sockaddr *y) |
1268 | { | |
1269 | struct sockaddr_un *u1, *u2; | |
1270 | struct sockaddr_in *n1, *n2; | |
1271 | #ifdef HAVE_IPV6 | |
1272 | struct sockaddr_in6 *s1, *s2; | |
1273 | #endif | |
1274 | ||
1275 | if(x->sa_family != y->sa_family) | |
1276 | return(0); | |
1277 | switch(x->sa_family) { | |
1278 | case AF_UNIX: | |
1279 | u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y; | |
1280 | if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path))) | |
1281 | return(0); | |
1282 | break; | |
1283 | case AF_INET: | |
1284 | n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y; | |
1285 | if(n1->sin_port != n2->sin_port) | |
1286 | return(0); | |
1287 | if(n1->sin_addr.s_addr != n2->sin_addr.s_addr) | |
1288 | return(0); | |
1289 | break; | |
c8a729d7 | 1290 | #ifdef HAVE_IPV6 |
99a28d47 | 1291 | case AF_INET6: |
1292 | s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y; | |
1293 | if(s1->sin6_port != s2->sin6_port) | |
1294 | return(0); | |
1295 | if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr))) | |
1296 | return(0); | |
1297 | break; | |
c8a729d7 | 1298 | #endif |
99a28d47 | 1299 | } |
1300 | return(1); | |
1301 | } | |
1302 | ||
d3372da9 | 1303 | char *formataddress(struct sockaddr *arg, socklen_t arglen) |
1304 | { | |
d3372da9 | 1305 | struct sockaddr_in *ipv4; |
1306 | #ifdef HAVE_IPV6 | |
1307 | struct sockaddr_in6 *ipv6; | |
1308 | #endif | |
1309 | static char *ret = NULL; | |
1310 | char buf[1024]; | |
1311 | ||
1312 | if(ret != NULL) | |
1313 | free(ret); | |
1314 | ret = NULL; | |
1315 | switch(arg->sa_family) | |
1316 | { | |
1317 | case AF_UNIX: | |
6a97462e | 1318 | ret = sstrdup("Unix socket"); |
d3372da9 | 1319 | break; |
1320 | case AF_INET: | |
1321 | ipv4 = (struct sockaddr_in *)arg; | |
1322 | if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL) | |
1323 | return(NULL); | |
1324 | ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port)); | |
1325 | break; | |
1326 | #ifdef HAVE_IPV6 | |
1327 | case AF_INET6: | |
1328 | ipv6 = (struct sockaddr_in6 *)arg; | |
1329 | if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL) | |
1330 | return(NULL); | |
fc7f7735 | 1331 | ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port)); |
d3372da9 | 1332 | break; |
1333 | #endif | |
1334 | default: | |
1335 | errno = EPFNOSUPPORT; | |
1336 | break; | |
1337 | } | |
1338 | return(ret); | |
1339 | } | |
1340 | ||
1341 | #if 0 | |
1342 | ||
1343 | /* | |
1344 | * It was very nice to use this, but it seems | |
1345 | * to mess things up, so I guess it has to go... :-( | |
1346 | */ | |
1347 | ||
1348 | static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args) | |
1349 | { | |
1350 | struct sockaddr *arg; | |
1351 | socklen_t arglen; | |
1352 | struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with | |
1353 | * lowercase letters to 1, so I do this | |
1354 | * instead. */ | |
1355 | struct sockaddr_in *ipv4; | |
1356 | int ret; | |
1357 | ||
1358 | arg = *(struct sockaddr **)(args[0]); | |
1359 | arglen = *(socklen_t *)(args[1]); | |
1360 | switch(arg->sa_family) | |
1361 | { | |
1362 | case AF_UNIX: | |
1363 | UNIX = (struct sockaddr_un *)arg; | |
1364 | ret = fprintf(stream, "%s", UNIX->sun_path); | |
1365 | break; | |
1366 | case AF_INET: | |
1367 | ipv4 = (struct sockaddr_in *)arg; | |
1368 | ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port)); | |
1369 | break; | |
1370 | default: | |
1371 | ret = -1; | |
1372 | errno = EPFNOSUPPORT; | |
1373 | break; | |
1374 | } | |
1375 | return(ret); | |
1376 | } | |
1377 | ||
1378 | static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes) | |
1379 | { | |
1380 | if(n > 0) | |
1381 | argtypes[0] = PA_POINTER; | |
1382 | if(n > 1) | |
1383 | argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_ | |
1384 | * be an int, so I guess this should be | |
1385 | * safe. */ | |
1386 | return(2); | |
1387 | } | |
1388 | #endif | |
1389 | ||
1390 | static int init(int hup) | |
1391 | { | |
1392 | if(!hup) | |
1393 | { | |
1394 | /* | |
1395 | if(register_printf_function('N', formataddress, formataddress_arginfo)) | |
1396 | { | |
1397 | flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno)); | |
1398 | return(1); | |
1399 | } | |
1400 | */ | |
1401 | } | |
1402 | return(0); | |
1403 | } | |
1404 | ||
1405 | static void terminate(void) | |
1406 | { | |
1407 | while(sockets != NULL) | |
1408 | unlinksock(sockets); | |
1409 | } | |
1410 | ||
1411 | static struct module me = | |
1412 | { | |
1413 | .name = "net", | |
1414 | .conf = | |
1415 | { | |
1416 | .vars = myvars | |
1417 | }, | |
1418 | .init = init, | |
1419 | .terminate = terminate | |
1420 | }; | |
1421 | ||
1422 | MODULE(me) |