1 /*-
2 * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/usr.sbin/ppp/server.c,v 1.28.2.6 2002/09/01 02:12:32 brian Exp $
27 * $DragonFly: src/usr.sbin/ppp/server.c,v 1.2 2003/06/17 04:30:01 dillon Exp $
28 */
29
30 #include <sys/param.h>
31
32 #include <sys/socket.h>
33 #include <netinet/in.h>
34 #include <sys/un.h>
35
36 #include <errno.h>
37 #include <stdarg.h>
38 #include <stdio.h>
39 #include <string.h>
40 #include <sys/stat.h>
41 #include <termios.h>
42 #include <unistd.h>
43
44 #include "log.h"
45 #include "descriptor.h"
46 #include "server.h"
47 #include "prompt.h"
48 #include "ncpaddr.h"
49 #include "probe.h"
50
51 static int
server_UpdateSet(struct fdescriptor * d,fd_set * r,fd_set * w,fd_set * e,int * n)52 server_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
53 {
54 struct server *s = descriptor2server(d);
55 struct prompt *p;
56 int sets;
57
58 sets = 0;
59 if (r && s->fd >= 0) {
60 if (*n < s->fd + 1)
61 *n = s->fd + 1;
62 FD_SET(s->fd, r);
63 log_Printf(LogTIMER, "server: fdset(r) %d\n", s->fd);
64 sets++;
65 }
66
67 for (p = log_PromptList(); p; p = p->next)
68 sets += descriptor_UpdateSet(&p->desc, r, w, e, n);
69
70 return sets;
71 }
72
73 static int
server_IsSet(struct fdescriptor * d,const fd_set * fdset)74 server_IsSet(struct fdescriptor *d, const fd_set *fdset)
75 {
76 struct server *s = descriptor2server(d);
77 struct prompt *p;
78
79 if (s->fd >= 0 && FD_ISSET(s->fd, fdset))
80 return 1;
81
82 for (p = log_PromptList(); p; p = p->next)
83 if (descriptor_IsSet(&p->desc, fdset))
84 return 1;
85
86 return 0;
87 }
88
89 static void
server_Read(struct fdescriptor * d,struct bundle * bundle,const fd_set * fdset)90 server_Read(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset)
91 {
92 struct server *s = descriptor2server(d);
93 struct sockaddr_storage ss;
94 struct sockaddr *sa = (struct sockaddr *)&ss;
95 struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
96 #ifndef NOINET6
97 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
98 #endif
99 int ssize = sizeof ss, wfd;
100 struct prompt *p;
101 struct ncpaddr addr;
102
103 if (s->fd >= 0 && FD_ISSET(s->fd, fdset)) {
104 wfd = accept(s->fd, sa, &ssize);
105 if (wfd < 0)
106 log_Printf(LogERROR, "server_Read: accept(): %s\n", strerror(errno));
107 else if (sa->sa_len == 0) {
108 close(wfd);
109 wfd = -1;
110 }
111 } else
112 wfd = -1;
113
114 if (wfd >= 0)
115 switch (sa->sa_family) {
116 case AF_LOCAL:
117 log_Printf(LogPHASE, "Connected to local client.\n");
118 break;
119
120 case AF_INET:
121 ncpaddr_setsa(&addr, sa);
122 if (ntohs(sin->sin_port) < 1024) {
123 log_Printf(LogALERT, "Rejected client connection from %s:%u"
124 "(invalid port number) !\n",
125 ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
126 close(wfd);
127 wfd = -1;
128 break;
129 }
130 log_Printf(LogPHASE, "Connected to client from %s:%u\n",
131 ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
132 break;
133
134 #ifndef NOINET6
135 case AF_INET6:
136 ncpaddr_setsa(&addr, sa);
137 if (ntohs(sin6->sin6_port) < 1024) {
138 log_Printf(LogALERT, "Rejected client connection from %s:%u"
139 "(invalid port number) !\n",
140 ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
141 close(wfd);
142 wfd = -1;
143 break;
144 }
145 log_Printf(LogPHASE, "Connected to client from %s:%u\n",
146 ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
147 break;
148 #endif
149
150 default:
151 write(wfd, "Unrecognised access !\n", 22);
152 close(wfd);
153 wfd = -1;
154 break;
155 }
156
157 if (wfd >= 0) {
158 if ((p = prompt_Create(s, bundle, wfd)) == NULL) {
159 write(wfd, "Connection refused.\n", 20);
160 close(wfd);
161 } else {
162 switch (sa->sa_family) {
163 case AF_LOCAL:
164 p->src.type = "local";
165 strncpy(p->src.from, s->cfg.sockname, sizeof p->src.from - 1);
166 p->src.from[sizeof p->src.from - 1] = '\0';
167 break;
168 case AF_INET:
169 p->src.type = "ip";
170 snprintf(p->src.from, sizeof p->src.from, "%s:%u",
171 ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
172 break;
173 #ifndef NOINET6
174 case AF_INET6:
175 p->src.type = "ip6";
176 snprintf(p->src.from, sizeof p->src.from, "%s:%u",
177 ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
178 break;
179 #endif
180 }
181 prompt_TtyCommandMode(p);
182 prompt_Required(p);
183 }
184 }
185
186 log_PromptListChanged = 0;
187 for (p = log_PromptList(); p; p = p->next)
188 if (descriptor_IsSet(&p->desc, fdset)) {
189 descriptor_Read(&p->desc, bundle, fdset);
190 if (log_PromptListChanged)
191 break;
192 }
193 }
194
195 static int
server_Write(struct fdescriptor * d __unused,struct bundle * bundle __unused,const fd_set * fdset __unused)196 server_Write(struct fdescriptor *d __unused, struct bundle *bundle __unused, const fd_set *fdset __unused)
197 {
198 /* We never want to write here ! */
199 log_Printf(LogALERT, "server_Write: Internal error: Bad call !\n");
200 return 0;
201 }
202
203 struct server server = {
204 {
205 SERVER_DESCRIPTOR,
206 server_UpdateSet,
207 server_IsSet,
208 server_Read,
209 server_Write
210 },
211 -1,
212 { "", "", 0, 0 }
213 };
214
215 enum server_stat
server_Reopen(struct bundle * bundle)216 server_Reopen(struct bundle *bundle)
217 {
218 char name[sizeof server.cfg.sockname];
219 struct stat st;
220 u_short port;
221 mode_t mask;
222 enum server_stat ret;
223
224 if (server.cfg.sockname[0] != '\0') {
225 strcpy(name, server.cfg.sockname);
226 mask = server.cfg.mask;
227 server_Close(bundle);
228 if (server.cfg.sockname[0] != '\0' && stat(server.cfg.sockname, &st) == 0)
229 if (!(st.st_mode & S_IFSOCK) || unlink(server.cfg.sockname) != 0)
230 return SERVER_FAILED;
231 ret = server_LocalOpen(bundle, name, mask);
232 } else if (server.cfg.port != 0) {
233 port = server.cfg.port;
234 server_Close(bundle);
235 ret = server_TcpOpen(bundle, port);
236 } else
237 ret = SERVER_UNSET;
238
239 return ret;
240 }
241
242 enum server_stat
server_LocalOpen(struct bundle * bundle,const char * name,mode_t mask)243 server_LocalOpen(struct bundle *bundle, const char *name, mode_t mask)
244 {
245 struct sockaddr_un ifsun;
246 mode_t oldmask;
247 int s;
248
249 oldmask = (mode_t)-1; /* Silence compiler */
250
251 if (server.cfg.sockname && !strcmp(server.cfg.sockname, name))
252 server_Close(bundle);
253
254 memset(&ifsun, '\0', sizeof ifsun);
255 ifsun.sun_len = strlen(name);
256 if (ifsun.sun_len > sizeof ifsun.sun_path - 1) {
257 log_Printf(LogERROR, "Local: %s: Path too long\n", name);
258 return SERVER_INVALID;
259 }
260 ifsun.sun_family = AF_LOCAL;
261 strcpy(ifsun.sun_path, name);
262
263 s = socket(PF_LOCAL, SOCK_STREAM, 0);
264 if (s < 0) {
265 log_Printf(LogERROR, "Local: socket: %s\n", strerror(errno));
266 goto failed;
267 }
268 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
269 if (mask != (mode_t)-1)
270 oldmask = umask(mask);
271 if (bind(s, (struct sockaddr *)&ifsun, sizeof ifsun) < 0) {
272 if (mask != (mode_t)-1)
273 umask(oldmask);
274 log_Printf(LogWARN, "Local: bind: %s\n", strerror(errno));
275 close(s);
276 goto failed;
277 }
278 if (mask != (mode_t)-1)
279 umask(oldmask);
280 if (listen(s, 5) != 0) {
281 log_Printf(LogERROR, "Local: Unable to listen to socket -"
282 " BUNDLE overload?\n");
283 close(s);
284 unlink(name);
285 goto failed;
286 }
287 server_Close(bundle);
288 server.fd = s;
289 server.cfg.port = 0;
290 strncpy(server.cfg.sockname, ifsun.sun_path, sizeof server.cfg.sockname - 1);
291 server.cfg.sockname[sizeof server.cfg.sockname - 1] = '\0';
292 server.cfg.mask = mask;
293 log_Printf(LogPHASE, "Listening at local socket %s.\n", name);
294
295 return SERVER_OK;
296
297 failed:
298 if (server.fd == -1) {
299 server.fd = -1;
300 server.cfg.port = 0;
301 strncpy(server.cfg.sockname, ifsun.sun_path,
302 sizeof server.cfg.sockname - 1);
303 server.cfg.sockname[sizeof server.cfg.sockname - 1] = '\0';
304 server.cfg.mask = mask;
305 }
306 return SERVER_FAILED;
307 }
308
309 enum server_stat
server_TcpOpen(struct bundle * bundle,u_short port)310 server_TcpOpen(struct bundle *bundle, u_short port)
311 {
312 struct sockaddr_storage ss;
313 struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
314 #ifndef NOINET6
315 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
316 #endif
317 int s, sz;
318
319 if (server.cfg.port == port)
320 server_Close(bundle);
321
322 if (port == 0)
323 return SERVER_INVALID;
324
325 memset(&ss, '\0', sizeof ss);
326 #ifndef NOINET6
327 if (probe.ipv6_available) {
328 sin6->sin6_family = AF_INET6;
329 sin6->sin6_port = htons(port);
330 sin6->sin6_len = (u_int8_t)sizeof ss;
331 sz = sizeof *sin6;
332 s = socket(PF_INET6, SOCK_STREAM, 0);
333 } else
334 #endif
335 {
336 sin->sin_family = AF_INET;
337 sin->sin_port = htons(port);
338 sin->sin_len = (u_int8_t)sizeof ss;
339 sin->sin_addr.s_addr = INADDR_ANY;
340 sz = sizeof *sin;
341 s = socket(PF_INET, SOCK_STREAM, 0);
342 }
343
344 if (s < 0) {
345 log_Printf(LogERROR, "Tcp: socket: %s\n", strerror(errno));
346 goto failed;
347 }
348
349 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
350 if (bind(s, (struct sockaddr *)&ss, sz) < 0) {
351 log_Printf(LogWARN, "Tcp: bind: %s\n", strerror(errno));
352 close(s);
353 goto failed;
354 }
355 if (listen(s, 5) != 0) {
356 log_Printf(LogERROR, "Tcp: Unable to listen to socket: %s\n",
357 strerror(errno));
358 close(s);
359 goto failed;
360 }
361 server_Close(bundle);
362 server.fd = s;
363 server.cfg.port = port;
364 *server.cfg.sockname = '\0';
365 server.cfg.mask = 0;
366 log_Printf(LogPHASE, "Listening at port %d.\n", port);
367 return SERVER_OK;
368
369 failed:
370 if (server.fd == -1) {
371 server.fd = -1;
372 server.cfg.port = port;
373 *server.cfg.sockname = '\0';
374 server.cfg.mask = 0;
375 }
376 return SERVER_FAILED;
377 }
378
379 int
server_Close(struct bundle * bundle __unused)380 server_Close(struct bundle *bundle __unused)
381 {
382 if (server.fd >= 0) {
383 if (*server.cfg.sockname != '\0') {
384 struct sockaddr_un un;
385 int sz = sizeof un;
386
387 if (getsockname(server.fd, (struct sockaddr *)&un, &sz) == 0 &&
388 un.sun_family == AF_LOCAL && sz == sizeof un)
389 unlink(un.sun_path);
390 }
391 close(server.fd);
392 server.fd = -1;
393 /* Drop associated prompts */
394 log_DestroyPrompts(&server);
395
396 return 1;
397 }
398
399 return 0;
400 }
401
402 int
server_Clear(struct bundle * bundle)403 server_Clear(struct bundle *bundle)
404 {
405 int ret;
406
407 ret = server_Close(bundle);
408
409 server.fd = -1;
410 server.cfg.port = 0;
411 *server.cfg.sockname = '\0';
412 server.cfg.mask = 0;
413
414 return ret;
415 }
416