author | Casper H.S. Dik <Casper.Dik@Sun.COM> |
Mon, 18 Jan 2010 11:49:54 +0100 | |
changeset 11537 | 8eca52188202 |
parent 8034 | 10557baff919 |
permissions | -rw-r--r-- |
0 | 1 |
/* |
2 |
* CDDL HEADER START |
|
3 |
* |
|
4 |
* The contents of this file are subject to the terms of the |
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diff
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|
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* Common Development and Distribution License (the "License"). |
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|
6 |
* You may not use this file except in compliance with the License. |
0 | 7 |
* |
8 |
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
|
9 |
* or http://www.opensolaris.org/os/licensing. |
|
10 |
* See the License for the specific language governing permissions |
|
11 |
* and limitations under the License. |
|
12 |
* |
|
13 |
* When distributing Covered Code, include this CDDL HEADER in each |
|
14 |
* file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
|
15 |
* If applicable, add the following below this CDDL HEADER, with the |
|
16 |
* fields enclosed by brackets "[]" replaced with your own identifying |
|
17 |
* information: Portions Copyright [yyyy] [name of copyright owner] |
|
18 |
* |
|
19 |
* CDDL HEADER END |
|
20 |
* |
|
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|
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* Copyright 2010 Sun Microsystems, Inc. All rights reserved. |
0 | 22 |
* Use is subject to license terms. |
23 |
*/ |
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24 |
||
25 |
/* |
|
26 |
* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T |
|
27 |
* All Rights Reserved. |
|
28 |
*/ |
|
29 |
||
30 |
/* |
|
31 |
* University Copyright- Copyright (c) 1982, 1986, 1988 |
|
32 |
* The Regents of the University of California. |
|
33 |
* All Rights Reserved. |
|
34 |
* |
|
35 |
* University Acknowledgment- Portions of this document are derived from |
|
36 |
* software developed by the University of California, Berkeley, and its |
|
37 |
* contributors. |
|
38 |
*/ |
|
39 |
||
40 |
/* |
|
41 |
* Trivial file transfer protocol server. A top level process runs in |
|
42 |
* an infinite loop fielding new TFTP requests. A child process, |
|
43 |
* communicating via a pipe with the top level process, sends delayed |
|
44 |
* NAKs for those that we can't handle. A new child process is created |
|
45 |
* to service each request that we can handle. The top level process |
|
46 |
* exits after a period of time during which no new requests are |
|
47 |
* received. |
|
48 |
*/ |
|
49 |
||
50 |
#include <sys/types.h> |
|
51 |
#include <sys/socket.h> |
|
52 |
#include <sys/wait.h> |
|
53 |
#include <sys/stat.h> |
|
54 |
#include <sys/time.h> |
|
55 |
||
56 |
#include <netinet/in.h> |
|
57 |
||
58 |
#include <arpa/inet.h> |
|
59 |
#include <dirent.h> |
|
60 |
#include <signal.h> |
|
61 |
#include <stdio.h> |
|
62 |
#include <stdlib.h> |
|
63 |
#include <unistd.h> |
|
64 |
#include <errno.h> |
|
65 |
#include <ctype.h> |
|
66 |
#include <netdb.h> |
|
67 |
#include <setjmp.h> |
|
68 |
#include <syslog.h> |
|
69 |
#include <sys/param.h> |
|
70 |
#include <fcntl.h> |
|
71 |
#include <pwd.h> |
|
72 |
#include <string.h> |
|
73 |
#include <priv_utils.h> |
|
74 |
#include "tftpcommon.h" |
|
75 |
||
76 |
#define TIMEOUT 5 |
|
77 |
#define DELAY_SECS 3 |
|
78 |
#define DALLYSECS 60 |
|
79 |
||
80 |
#define SYSLOG_MSG(message) \ |
|
81 |
(syslog((((errno == ENETUNREACH) || (errno == EHOSTUNREACH) || \ |
|
82 |
(errno == ECONNREFUSED)) ? LOG_WARNING : LOG_ERR), message)) |
|
83 |
||
84 |
static int rexmtval = TIMEOUT; |
|
85 |
static int maxtimeout = 5*TIMEOUT; |
|
86 |
static int securetftp; |
|
87 |
static int debug; |
|
88 |
static int disable_pnp; |
|
89 |
static int standalone; |
|
90 |
static uid_t uid_nobody = UID_NOBODY; |
|
91 |
static uid_t gid_nobody = GID_NOBODY; |
|
92 |
static int reqsock = -1; |
|
93 |
/* file descriptor of request socket */ |
|
94 |
static socklen_t fromlen; |
|
95 |
static socklen_t fromplen; |
|
96 |
static struct sockaddr_storage client; |
|
97 |
static struct sockaddr_in6 *sin6_ptr; |
|
98 |
static struct sockaddr_in *sin_ptr; |
|
99 |
static struct sockaddr_in6 *from6_ptr; |
|
100 |
static struct sockaddr_in *from_ptr; |
|
101 |
static int addrfmly; |
|
102 |
static int peer; |
|
103 |
static off_t tsize; |
|
104 |
static tftpbuf ackbuf; |
|
105 |
static struct sockaddr_storage from; |
|
106 |
static boolean_t tsize_set; |
|
107 |
static pid_t child; |
|
108 |
/* pid of child handling delayed replys */ |
|
109 |
static int delay_fd [2]; |
|
110 |
/* pipe for communicating with child */ |
|
111 |
static FILE *file; |
|
112 |
static char *filename; |
|
113 |
||
114 |
static union { |
|
115 |
struct tftphdr hdr; |
|
116 |
char data[SEGSIZE + 4]; |
|
117 |
} buf; |
|
118 |
||
119 |
static union { |
|
120 |
struct tftphdr hdr; |
|
121 |
char data[SEGSIZE]; |
|
122 |
} oackbuf; |
|
123 |
||
124 |
struct delay_info { |
|
125 |
long timestamp; /* time request received */ |
|
126 |
int ecode; /* error code to return */ |
|
127 |
struct sockaddr_storage from; /* address of client */ |
|
128 |
}; |
|
129 |
||
130 |
int blocksize = SEGSIZE; /* Number of data bytes in a DATA packet */ |
|
131 |
||
132 |
/* |
|
133 |
* Default directory for unqualified names |
|
134 |
* Used by TFTP boot procedures |
|
135 |
*/ |
|
136 |
static char *homedir = "/tftpboot"; |
|
137 |
||
138 |
struct formats { |
|
139 |
char *f_mode; |
|
140 |
int (*f_validate)(int); |
|
141 |
void (*f_send)(struct formats *, int); |
|
142 |
void (*f_recv)(struct formats *, int); |
|
143 |
int f_convert; |
|
144 |
}; |
|
145 |
||
146 |
static void delayed_responder(void); |
|
147 |
static void tftp(struct tftphdr *, int); |
|
148 |
static int validate_filename(int); |
|
149 |
static void tftpd_sendfile(struct formats *, int); |
|
150 |
static void tftpd_recvfile(struct formats *, int); |
|
151 |
static void nak(int); |
|
152 |
static char *blksize_handler(int, char *, int *); |
|
153 |
static char *timeout_handler(int, char *, int *); |
|
154 |
static char *tsize_handler(int, char *, int *); |
|
155 |
||
156 |
static struct formats formats[] = { |
|
157 |
{ "netascii", validate_filename, tftpd_sendfile, tftpd_recvfile, 1 }, |
|
158 |
{ "octet", validate_filename, tftpd_sendfile, tftpd_recvfile, 0 }, |
|
159 |
{ NULL } |
|
160 |
}; |
|
161 |
||
162 |
struct options { |
|
163 |
char *opt_name; |
|
164 |
char *(*opt_handler)(int, char *, int *); |
|
165 |
}; |
|
166 |
||
167 |
static struct options options[] = { |
|
168 |
{ "blksize", blksize_handler }, |
|
169 |
{ "timeout", timeout_handler }, |
|
170 |
{ "tsize", tsize_handler }, |
|
171 |
{ NULL } |
|
172 |
}; |
|
173 |
||
174 |
static char optbuf[MAX_OPTVAL_LEN]; |
|
175 |
static int timeout; |
|
176 |
static sigjmp_buf timeoutbuf; |
|
177 |
||
178 |
int |
|
179 |
main(int argc, char **argv) |
|
180 |
{ |
|
181 |
struct tftphdr *tp; |
|
182 |
int n; |
|
183 |
int c; |
|
184 |
struct passwd *pwd; /* for "nobody" entry */ |
|
185 |
struct in_addr ipv4addr; |
|
186 |
char abuf[INET6_ADDRSTRLEN]; |
|
187 |
socklen_t addrlen; |
|
188 |
||
189 |
openlog("tftpd", LOG_PID, LOG_DAEMON); |
|
190 |
||
191 |
pwd = getpwnam("nobody"); |
|
192 |
if (pwd != NULL) { |
|
193 |
uid_nobody = pwd->pw_uid; |
|
194 |
gid_nobody = pwd->pw_gid; |
|
195 |
} |
|
196 |
||
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
197 |
/* Tftp will not start new executables; clear the limit set. */ |
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
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parents:
8034
diff
changeset
|
198 |
(void) __init_daemon_priv(PU_CLEARLIMITSET, uid_nobody, gid_nobody, |
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
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parents:
8034
diff
changeset
|
199 |
PRIV_PROC_CHROOT, PRIV_NET_PRIVADDR, NULL); |
0 | 200 |
|
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
201 |
/* Remove the unneeded basic privileges everywhere. */ |
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
202 |
(void) priv_set(PRIV_OFF, PRIV_ALLSETS, PRIV_PROC_EXEC, |
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
203 |
PRIV_FILE_LINK_ANY, PRIV_PROC_INFO, PRIV_PROC_SESSION, NULL); |
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
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parents:
8034
diff
changeset
|
204 |
|
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
205 |
/* Remove the other privileges from E until we need them. */ |
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
206 |
(void) priv_set(PRIV_OFF, PRIV_EFFECTIVE, PRIV_PROC_CHROOT, |
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
207 |
PRIV_NET_PRIVADDR, NULL); |
0 | 208 |
|
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PSARC 2008/652 tftpd server maximum timeout
Sreedhar Chalamalasetti - Sun Microsystems - Bangalore India <Sreedhar.Chalamalasetti@Sun.COM>
parents:
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diff
changeset
|
209 |
while ((c = getopt(argc, argv, "dspST:")) != EOF) |
0 | 210 |
switch (c) { |
211 |
case 'd': /* enable debug */ |
|
212 |
debug++; |
|
213 |
continue; |
|
214 |
case 's': /* secure daemon */ |
|
215 |
securetftp = 1; |
|
216 |
continue; |
|
217 |
case 'p': /* disable name pnp mapping */ |
|
218 |
disable_pnp = 1; |
|
219 |
continue; |
|
220 |
case 'S': |
|
221 |
standalone = 1; |
|
222 |
continue; |
|
8034
10557baff919
PSARC 2008/652 tftpd server maximum timeout
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parents:
4921
diff
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|
223 |
case 'T': |
10557baff919
PSARC 2008/652 tftpd server maximum timeout
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parents:
4921
diff
changeset
|
224 |
rexmtval = atoi(optarg); |
10557baff919
PSARC 2008/652 tftpd server maximum timeout
Sreedhar Chalamalasetti - Sun Microsystems - Bangalore India <Sreedhar.Chalamalasetti@Sun.COM>
parents:
4921
diff
changeset
|
225 |
if (rexmtval <= 0 || rexmtval > MAX_TIMEOUT) { |
10557baff919
PSARC 2008/652 tftpd server maximum timeout
Sreedhar Chalamalasetti - Sun Microsystems - Bangalore India <Sreedhar.Chalamalasetti@Sun.COM>
parents:
4921
diff
changeset
|
226 |
(void) fprintf(stderr, |
10557baff919
PSARC 2008/652 tftpd server maximum timeout
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parents:
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changeset
|
227 |
"%s: Invalid retransmission " |
10557baff919
PSARC 2008/652 tftpd server maximum timeout
Sreedhar Chalamalasetti - Sun Microsystems - Bangalore India <Sreedhar.Chalamalasetti@Sun.COM>
parents:
4921
diff
changeset
|
228 |
"timeout value: %s\n", argv[0], optarg); |
10557baff919
PSARC 2008/652 tftpd server maximum timeout
Sreedhar Chalamalasetti - Sun Microsystems - Bangalore India <Sreedhar.Chalamalasetti@Sun.COM>
parents:
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diff
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|
229 |
exit(1); |
10557baff919
PSARC 2008/652 tftpd server maximum timeout
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parents:
4921
diff
changeset
|
230 |
} |
10557baff919
PSARC 2008/652 tftpd server maximum timeout
Sreedhar Chalamalasetti - Sun Microsystems - Bangalore India <Sreedhar.Chalamalasetti@Sun.COM>
parents:
4921
diff
changeset
|
231 |
maxtimeout = 5 * rexmtval; |
10557baff919
PSARC 2008/652 tftpd server maximum timeout
Sreedhar Chalamalasetti - Sun Microsystems - Bangalore India <Sreedhar.Chalamalasetti@Sun.COM>
parents:
4921
diff
changeset
|
232 |
continue; |
0 | 233 |
case '?': |
234 |
default: |
|
235 |
usage: |
|
236 |
(void) fprintf(stderr, |
|
8034
10557baff919
PSARC 2008/652 tftpd server maximum timeout
Sreedhar Chalamalasetti - Sun Microsystems - Bangalore India <Sreedhar.Chalamalasetti@Sun.COM>
parents:
4921
diff
changeset
|
237 |
"usage: %s [-T rexmtval] [-spd] [home-directory]\n", |
10557baff919
PSARC 2008/652 tftpd server maximum timeout
Sreedhar Chalamalasetti - Sun Microsystems - Bangalore India <Sreedhar.Chalamalasetti@Sun.COM>
parents:
4921
diff
changeset
|
238 |
argv[0]); |
0 | 239 |
for (; optind < argc; optind++) |
240 |
syslog(LOG_ERR, "bad argument %s", |
|
241 |
argv[optind]); |
|
242 |
exit(1); |
|
243 |
} |
|
244 |
||
245 |
if (optind < argc) |
|
246 |
if (optind == argc - 1 && *argv [optind] == '/') |
|
247 |
homedir = argv [optind]; |
|
248 |
else |
|
249 |
goto usage; |
|
250 |
||
251 |
if (pipe(delay_fd) < 0) { |
|
252 |
syslog(LOG_ERR, "pipe (main): %m"); |
|
253 |
exit(1); |
|
254 |
} |
|
255 |
||
256 |
(void) sigset(SIGCHLD, SIG_IGN); /* no zombies please */ |
|
257 |
||
258 |
if (standalone) { |
|
259 |
socklen_t clientlen; |
|
260 |
||
261 |
sin6_ptr = (struct sockaddr_in6 *)&client; |
|
262 |
clientlen = sizeof (struct sockaddr_in6); |
|
263 |
reqsock = socket(AF_INET6, SOCK_DGRAM, 0); |
|
264 |
if (reqsock == -1) { |
|
265 |
perror("socket"); |
|
266 |
exit(1); |
|
267 |
} |
|
268 |
(void) memset(&client, 0, clientlen); |
|
269 |
sin6_ptr->sin6_family = AF_INET6; |
|
270 |
sin6_ptr->sin6_port = htons(IPPORT_TFTP); |
|
4921 | 271 |
|
272 |
/* Enable privilege as tftp port is < 1024 */ |
|
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
273 |
(void) priv_set(PRIV_ON, |
4921 | 274 |
PRIV_EFFECTIVE, PRIV_NET_PRIVADDR, NULL); |
0 | 275 |
if (bind(reqsock, (struct sockaddr *)&client, |
276 |
clientlen) == -1) { |
|
277 |
perror("bind"); |
|
278 |
exit(1); |
|
279 |
} |
|
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
280 |
(void) priv_set(PRIV_OFF, PRIV_EFFECTIVE, PRIV_NET_PRIVADDR, |
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
281 |
NULL); |
4921 | 282 |
|
0 | 283 |
if (debug) |
284 |
(void) puts("running in standalone mode..."); |
|
285 |
} else { |
|
286 |
/* request socket passed on fd 0 by inetd */ |
|
287 |
reqsock = 0; |
|
288 |
} |
|
289 |
if (debug) { |
|
290 |
int on = 1; |
|
291 |
||
292 |
(void) setsockopt(reqsock, SOL_SOCKET, SO_DEBUG, |
|
293 |
(char *)&on, sizeof (on)); |
|
294 |
} |
|
295 |
||
296 |
(void) chdir(homedir); |
|
297 |
||
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
298 |
(void) priv_set(PRIV_ON, PRIV_EFFECTIVE, PRIV_PROC_FORK, NULL); |
0 | 299 |
if ((child = fork()) < 0) { |
300 |
syslog(LOG_ERR, "fork (main): %m"); |
|
301 |
exit(1); |
|
302 |
} |
|
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
303 |
(void) priv_set(PRIV_OFF, PRIV_EFFECTIVE, PRIV_PROC_FORK, NULL); |
0 | 304 |
|
305 |
if (child == 0) { |
|
306 |
delayed_responder(); |
|
307 |
} /* child */ |
|
308 |
||
309 |
/* close read side of pipe */ |
|
310 |
(void) close(delay_fd[0]); |
|
311 |
||
312 |
||
313 |
/* |
|
314 |
* Top level handling of incomming tftp requests. Read a request |
|
315 |
* and pass it off to be handled. If request is valid, handling |
|
316 |
* forks off and parent returns to this loop. If no new requests |
|
317 |
* are received for DALLYSECS, exit and return to inetd. |
|
318 |
*/ |
|
319 |
||
320 |
for (;;) { |
|
321 |
fd_set readfds; |
|
322 |
struct timeval dally; |
|
323 |
||
324 |
FD_ZERO(&readfds); |
|
325 |
FD_SET(reqsock, &readfds); |
|
326 |
dally.tv_sec = DALLYSECS; |
|
327 |
dally.tv_usec = 0; |
|
328 |
||
329 |
n = select(reqsock + 1, &readfds, NULL, NULL, &dally); |
|
330 |
if (n < 0) { |
|
331 |
if (errno == EINTR) |
|
332 |
continue; |
|
333 |
syslog(LOG_ERR, "select: %m"); |
|
334 |
(void) kill(child, SIGKILL); |
|
335 |
exit(1); |
|
336 |
} |
|
337 |
if (n == 0) { |
|
338 |
/* Select timed out. Its time to die. */ |
|
339 |
if (standalone) |
|
340 |
continue; |
|
341 |
else { |
|
342 |
(void) kill(child, SIGKILL); |
|
343 |
exit(0); |
|
344 |
} |
|
345 |
} |
|
346 |
addrlen = sizeof (from); |
|
347 |
if (getsockname(reqsock, (struct sockaddr *)&from, |
|
348 |
&addrlen) < 0) { |
|
349 |
syslog(LOG_ERR, "getsockname: %m"); |
|
350 |
exit(1); |
|
351 |
} |
|
352 |
||
353 |
switch (from.ss_family) { |
|
354 |
case AF_INET: |
|
355 |
fromlen = (socklen_t)sizeof (struct sockaddr_in); |
|
356 |
break; |
|
357 |
case AF_INET6: |
|
358 |
fromlen = (socklen_t)sizeof (struct sockaddr_in6); |
|
359 |
break; |
|
360 |
default: |
|
361 |
syslog(LOG_ERR, |
|
362 |
"Unknown address Family on peer connection %d", |
|
363 |
from.ss_family); |
|
364 |
exit(1); |
|
365 |
} |
|
366 |
||
367 |
n = recvfrom(reqsock, &buf, sizeof (buf), 0, |
|
4921 | 368 |
(struct sockaddr *)&from, &fromlen); |
0 | 369 |
if (n < 0) { |
370 |
if (errno == EINTR) |
|
371 |
continue; |
|
372 |
if (standalone) |
|
373 |
perror("recvfrom"); |
|
374 |
else |
|
375 |
syslog(LOG_ERR, "recvfrom: %m"); |
|
376 |
(void) kill(child, SIGKILL); |
|
377 |
exit(1); |
|
378 |
} |
|
379 |
||
380 |
(void) alarm(0); |
|
381 |
||
382 |
switch (from.ss_family) { |
|
383 |
case AF_INET: |
|
384 |
addrfmly = AF_INET; |
|
385 |
fromplen = sizeof (struct sockaddr_in); |
|
386 |
sin_ptr = (struct sockaddr_in *)&client; |
|
387 |
(void) memset(&client, 0, fromplen); |
|
388 |
sin_ptr->sin_family = AF_INET; |
|
389 |
break; |
|
390 |
case AF_INET6: |
|
391 |
addrfmly = AF_INET6; |
|
392 |
fromplen = sizeof (struct sockaddr_in6); |
|
393 |
sin6_ptr = (struct sockaddr_in6 *)&client; |
|
394 |
(void) memset(&client, 0, fromplen); |
|
395 |
sin6_ptr->sin6_family = AF_INET6; |
|
396 |
break; |
|
397 |
default: |
|
398 |
syslog(LOG_ERR, |
|
399 |
"Unknown address Family on peer connection"); |
|
400 |
exit(1); |
|
401 |
} |
|
402 |
peer = socket(addrfmly, SOCK_DGRAM, 0); |
|
403 |
if (peer < 0) { |
|
404 |
if (standalone) |
|
405 |
perror("socket (main)"); |
|
406 |
else |
|
407 |
syslog(LOG_ERR, "socket (main): %m"); |
|
408 |
(void) kill(child, SIGKILL); |
|
409 |
exit(1); |
|
410 |
} |
|
411 |
if (debug) { |
|
412 |
int on = 1; |
|
413 |
||
414 |
(void) setsockopt(peer, SOL_SOCKET, SO_DEBUG, |
|
415 |
(char *)&on, sizeof (on)); |
|
416 |
} |
|
417 |
||
418 |
if (bind(peer, (struct sockaddr *)&client, fromplen) < 0) { |
|
419 |
if (standalone) |
|
420 |
perror("bind (main)"); |
|
421 |
else |
|
422 |
syslog(LOG_ERR, "bind (main): %m"); |
|
423 |
(void) kill(child, SIGKILL); |
|
424 |
exit(1); |
|
425 |
} |
|
426 |
if (standalone && debug) { |
|
427 |
sin6_ptr = (struct sockaddr_in6 *)&client; |
|
428 |
from6_ptr = (struct sockaddr_in6 *)&from; |
|
429 |
if (IN6_IS_ADDR_V4MAPPED(&from6_ptr->sin6_addr)) { |
|
430 |
IN6_V4MAPPED_TO_INADDR(&from6_ptr->sin6_addr, |
|
431 |
&ipv4addr); |
|
432 |
(void) inet_ntop(AF_INET, &ipv4addr, abuf, |
|
433 |
sizeof (abuf)); |
|
434 |
} else { |
|
435 |
(void) inet_ntop(AF_INET6, |
|
436 |
&from6_ptr->sin6_addr, abuf, |
|
437 |
sizeof (abuf)); |
|
438 |
} |
|
439 |
/* get local port */ |
|
440 |
if (getsockname(peer, (struct sockaddr *)&client, |
|
441 |
&fromplen) < 0) |
|
442 |
perror("getsockname (main)"); |
|
443 |
(void) fprintf(stderr, |
|
444 |
"request from %s port %d; local port %d\n", |
|
445 |
abuf, from6_ptr->sin6_port, sin6_ptr->sin6_port); |
|
446 |
} |
|
447 |
tp = &buf.hdr; |
|
448 |
tp->th_opcode = ntohs((ushort_t)tp->th_opcode); |
|
449 |
if (tp->th_opcode == RRQ || tp->th_opcode == WRQ) |
|
450 |
tftp(tp, n); |
|
451 |
||
452 |
(void) close(peer); |
|
453 |
(void) fclose(file); |
|
454 |
} |
|
455 |
||
456 |
/*NOTREACHED*/ |
|
457 |
return (0); |
|
458 |
} |
|
459 |
||
460 |
static void |
|
461 |
delayed_responder(void) |
|
462 |
{ |
|
463 |
struct delay_info dinfo; |
|
464 |
long now; |
|
465 |
||
466 |
/* we don't use the descriptors passed in to the parent */ |
|
467 |
(void) close(0); |
|
468 |
(void) close(1); |
|
469 |
if (standalone) |
|
470 |
(void) close(reqsock); |
|
471 |
||
472 |
/* close write side of pipe */ |
|
473 |
(void) close(delay_fd[1]); |
|
474 |
||
475 |
for (;;) { |
|
476 |
int n; |
|
477 |
||
478 |
if ((n = read(delay_fd[0], &dinfo, |
|
479 |
sizeof (dinfo))) != sizeof (dinfo)) { |
|
480 |
if (n < 0) { |
|
481 |
if (errno == EINTR) |
|
482 |
continue; |
|
483 |
if (standalone) |
|
484 |
perror("read from pipe " |
|
485 |
"(delayed responder)"); |
|
486 |
else |
|
487 |
syslog(LOG_ERR, "read from pipe: %m"); |
|
488 |
} |
|
489 |
exit(1); |
|
490 |
} |
|
491 |
switch (dinfo.from.ss_family) { |
|
492 |
case AF_INET: |
|
493 |
addrfmly = AF_INET; |
|
494 |
fromplen = sizeof (struct sockaddr_in); |
|
495 |
sin_ptr = (struct sockaddr_in *)&client; |
|
496 |
(void) memset(&client, 0, fromplen); |
|
497 |
sin_ptr->sin_family = AF_INET; |
|
498 |
break; |
|
499 |
case AF_INET6: |
|
500 |
addrfmly = AF_INET6; |
|
501 |
fromplen = sizeof (struct sockaddr_in6); |
|
502 |
sin6_ptr = (struct sockaddr_in6 *)&client; |
|
503 |
(void) memset(&client, 0, fromplen); |
|
504 |
sin6_ptr->sin6_family = AF_INET6; |
|
505 |
break; |
|
506 |
} |
|
507 |
peer = socket(addrfmly, SOCK_DGRAM, 0); |
|
508 |
if (peer == -1) { |
|
509 |
if (standalone) |
|
510 |
perror("socket (delayed responder)"); |
|
511 |
else |
|
512 |
syslog(LOG_ERR, "socket (delay): %m"); |
|
513 |
exit(1); |
|
514 |
} |
|
515 |
if (debug) { |
|
516 |
int on = 1; |
|
517 |
||
518 |
(void) setsockopt(peer, SOL_SOCKET, SO_DEBUG, |
|
519 |
(char *)&on, sizeof (on)); |
|
520 |
} |
|
521 |
||
522 |
if (bind(peer, (struct sockaddr *)&client, fromplen) < 0) { |
|
523 |
if (standalone) |
|
524 |
perror("bind (delayed responder)"); |
|
525 |
else |
|
526 |
syslog(LOG_ERR, "bind (delay): %m"); |
|
527 |
exit(1); |
|
528 |
} |
|
529 |
if (client.ss_family == AF_INET) { |
|
530 |
from_ptr = (struct sockaddr_in *)&dinfo.from; |
|
531 |
from_ptr->sin_family = AF_INET; |
|
532 |
} else { |
|
533 |
from6_ptr = (struct sockaddr_in6 *)&dinfo.from; |
|
534 |
from6_ptr->sin6_family = AF_INET6; |
|
535 |
} |
|
536 |
/* |
|
537 |
* Since a request hasn't been received from the client |
|
538 |
* before the delayed responder process is forked, the |
|
539 |
* from variable is uninitialized. So set it to contain |
|
540 |
* the client address. |
|
541 |
*/ |
|
542 |
from = dinfo.from; |
|
543 |
||
544 |
/* |
|
545 |
* only sleep if DELAY_SECS has not elapsed since |
|
546 |
* original request was received. Ensure that `now' |
|
547 |
* is not earlier than `dinfo.timestamp' |
|
548 |
*/ |
|
549 |
now = time(0); |
|
550 |
if ((uint_t)(now - dinfo.timestamp) < DELAY_SECS) |
|
551 |
(void) sleep(DELAY_SECS - (now - dinfo.timestamp)); |
|
552 |
nak(dinfo.ecode); |
|
553 |
(void) close(peer); |
|
554 |
} /* for */ |
|
555 |
||
556 |
/* NOTREACHED */ |
|
557 |
} |
|
558 |
||
559 |
/* |
|
560 |
* Handle the Blocksize option. |
|
561 |
* Return the blksize option value string to include in the OACK reply. |
|
562 |
*/ |
|
563 |
/*ARGSUSED*/ |
|
564 |
static char * |
|
565 |
blksize_handler(int opcode, char *optval, int *errcode) |
|
566 |
{ |
|
567 |
char *endp; |
|
568 |
int value; |
|
569 |
||
570 |
*errcode = -1; |
|
571 |
errno = 0; |
|
572 |
value = (int)strtol(optval, &endp, 10); |
|
573 |
if (errno != 0 || value < MIN_BLKSIZE || *endp != '\0') |
|
574 |
return (NULL); |
|
575 |
/* |
|
576 |
* As the blksize value in the OACK reply can be less than the value |
|
577 |
* requested, to support broken clients if the value requested is larger |
|
578 |
* than allowed in the RFC, reply with the maximum value permitted. |
|
579 |
*/ |
|
580 |
if (value > MAX_BLKSIZE) |
|
581 |
value = MAX_BLKSIZE; |
|
582 |
||
583 |
blocksize = value; |
|
584 |
(void) snprintf(optbuf, sizeof (optbuf), "%d", blocksize); |
|
585 |
return (optbuf); |
|
586 |
} |
|
587 |
||
588 |
/* |
|
589 |
* Handle the Timeout Interval option. |
|
590 |
* Return the timeout option value string to include in the OACK reply. |
|
591 |
*/ |
|
592 |
/*ARGSUSED*/ |
|
593 |
static char * |
|
594 |
timeout_handler(int opcode, char *optval, int *errcode) |
|
595 |
{ |
|
596 |
char *endp; |
|
597 |
int value; |
|
598 |
||
599 |
*errcode = -1; |
|
600 |
errno = 0; |
|
601 |
value = (int)strtol(optval, &endp, 10); |
|
602 |
if (errno != 0 || *endp != '\0') |
|
603 |
return (NULL); |
|
604 |
/* |
|
605 |
* The timeout value in the OACK reply must match the value specified |
|
606 |
* by the client, so if an invalid timeout is requested don't include |
|
607 |
* the timeout option in the OACK reply. |
|
608 |
*/ |
|
609 |
if (value < MIN_TIMEOUT || value > MAX_TIMEOUT) |
|
610 |
return (NULL); |
|
611 |
||
612 |
rexmtval = value; |
|
613 |
maxtimeout = 5 * rexmtval; |
|
614 |
(void) snprintf(optbuf, sizeof (optbuf), "%d", rexmtval); |
|
615 |
return (optbuf); |
|
616 |
} |
|
617 |
||
618 |
/* |
|
619 |
* Handle the Transfer Size option. |
|
620 |
* Return the tsize option value string to include in the OACK reply. |
|
621 |
*/ |
|
622 |
static char * |
|
623 |
tsize_handler(int opcode, char *optval, int *errcode) |
|
624 |
{ |
|
625 |
char *endp; |
|
626 |
longlong_t value; |
|
627 |
||
628 |
*errcode = -1; |
|
629 |
errno = 0; |
|
630 |
value = strtoll(optval, &endp, 10); |
|
631 |
if (errno != 0 || value < 0 || *endp != '\0') |
|
632 |
return (NULL); |
|
633 |
||
634 |
if (opcode == RRQ) { |
|
635 |
if (tsize_set == B_FALSE) |
|
636 |
return (NULL); |
|
637 |
/* |
|
638 |
* The tsize value should be 0 for a read request, but to |
|
639 |
* support broken clients we don't check that it is. |
|
640 |
*/ |
|
641 |
} else { |
|
642 |
#if _FILE_OFFSET_BITS == 32 |
|
643 |
if (value > MAXOFF_T) { |
|
644 |
*errcode = ENOSPACE; |
|
645 |
return (NULL); |
|
646 |
} |
|
647 |
#endif |
|
648 |
tsize = value; |
|
649 |
tsize_set = B_TRUE; |
|
650 |
} |
|
651 |
(void) snprintf(optbuf, sizeof (optbuf), OFF_T_FMT, tsize); |
|
652 |
return (optbuf); |
|
653 |
} |
|
654 |
||
655 |
/* |
|
656 |
* Process any options included by the client in the request packet. |
|
657 |
* Return the size of the OACK reply packet built or 0 for no OACK reply. |
|
658 |
*/ |
|
659 |
static int |
|
660 |
process_options(int opcode, char *opts, char *endopts) |
|
661 |
{ |
|
662 |
char *cp, *optname, *optval, *ostr, *oackend; |
|
663 |
struct tftphdr *oackp; |
|
664 |
int i, errcode; |
|
665 |
||
666 |
/* |
|
667 |
* To continue to interoperate with broken TFTP clients, ignore |
|
668 |
* null padding appended to requests which don't include options. |
|
669 |
*/ |
|
670 |
cp = opts; |
|
671 |
while ((cp < endopts) && (*cp == '\0')) |
|
672 |
cp++; |
|
673 |
if (cp == endopts) |
|
674 |
return (0); |
|
675 |
||
676 |
/* |
|
677 |
* Construct an Option ACKnowledgement packet if any requested option |
|
678 |
* is recognized. |
|
679 |
*/ |
|
680 |
oackp = &oackbuf.hdr; |
|
681 |
oackend = oackbuf.data + sizeof (oackbuf.data); |
|
682 |
oackp->th_opcode = htons((ushort_t)OACK); |
|
683 |
cp = (char *)&oackp->th_stuff; |
|
684 |
while (opts < endopts) { |
|
685 |
optname = opts; |
|
686 |
if ((optval = next_field(optname, endopts)) == NULL) { |
|
687 |
nak(EOPTNEG); |
|
688 |
exit(1); |
|
689 |
} |
|
690 |
if ((opts = next_field(optval, endopts)) == NULL) { |
|
691 |
nak(EOPTNEG); |
|
692 |
exit(1); |
|
693 |
} |
|
694 |
for (i = 0; options[i].opt_name != NULL; i++) { |
|
695 |
if (strcasecmp(optname, options[i].opt_name) == 0) |
|
696 |
break; |
|
697 |
} |
|
698 |
if (options[i].opt_name != NULL) { |
|
699 |
ostr = options[i].opt_handler(opcode, optval, &errcode); |
|
700 |
if (ostr != NULL) { |
|
701 |
cp += strlcpy(cp, options[i].opt_name, |
|
702 |
oackend - cp) + 1; |
|
703 |
if (cp <= oackend) |
|
704 |
cp += strlcpy(cp, ostr, oackend - cp) |
|
705 |
+ 1; |
|
706 |
||
707 |
if (cp > oackend) { |
|
708 |
nak(EOPTNEG); |
|
709 |
exit(1); |
|
710 |
} |
|
711 |
} else if (errcode >= 0) { |
|
712 |
nak(errcode); |
|
713 |
exit(1); |
|
714 |
} |
|
715 |
} |
|
716 |
} |
|
717 |
if (cp != (char *)&oackp->th_stuff) |
|
718 |
return (cp - oackbuf.data); |
|
719 |
return (0); |
|
720 |
} |
|
721 |
||
722 |
/* |
|
723 |
* Handle access errors caused by client requests. |
|
724 |
*/ |
|
725 |
||
726 |
static void |
|
727 |
delay_exit(int ecode) |
|
728 |
{ |
|
729 |
struct delay_info dinfo; |
|
730 |
||
731 |
/* |
|
732 |
* The most likely cause of an error here is that |
|
733 |
* someone has broadcast an RRQ packet because s/he's |
|
734 |
* trying to boot and doesn't know who the server is. |
|
735 |
* Rather then sending an ERROR packet immediately, we |
|
736 |
* wait a while so that the real server has a better chance |
|
737 |
* of getting through (in case client has lousy Ethernet |
|
738 |
* interface). We write to a child that handles delayed |
|
739 |
* ERROR packets to avoid delaying service to new |
|
740 |
* requests. Of course, we would rather just not answer |
|
741 |
* RRQ packets that are broadcasted, but there's no way |
|
742 |
* for a user process to determine this. |
|
743 |
*/ |
|
744 |
||
745 |
dinfo.timestamp = time(0); |
|
746 |
||
747 |
/* |
|
748 |
* If running in secure mode, we map all errors to EACCESS |
|
749 |
* so that the client gets no information about which files |
|
750 |
* or directories exist. |
|
751 |
*/ |
|
752 |
if (securetftp) |
|
753 |
dinfo.ecode = EACCESS; |
|
754 |
else |
|
755 |
dinfo.ecode = ecode; |
|
756 |
||
757 |
dinfo.from = from; |
|
758 |
if (write(delay_fd[1], &dinfo, sizeof (dinfo)) != |
|
759 |
sizeof (dinfo)) { |
|
760 |
syslog(LOG_ERR, "delayed write failed."); |
|
761 |
(void) kill(child, SIGKILL); |
|
762 |
exit(1); |
|
763 |
} |
|
764 |
exit(0); |
|
765 |
} |
|
766 |
||
767 |
/* |
|
768 |
* Handle initial connection protocol. |
|
769 |
*/ |
|
770 |
static void |
|
771 |
tftp(struct tftphdr *tp, int size) |
|
772 |
{ |
|
773 |
char *cp; |
|
774 |
int readmode, ecode; |
|
775 |
struct formats *pf; |
|
776 |
char *mode; |
|
777 |
int fd; |
|
778 |
static boolean_t firsttime = B_TRUE; |
|
779 |
int oacklen; |
|
780 |
struct stat statb; |
|
781 |
||
782 |
readmode = (tp->th_opcode == RRQ); |
|
783 |
filename = (char *)&tp->th_stuff; |
|
784 |
mode = next_field(filename, &buf.data[size]); |
|
785 |
cp = (mode != NULL) ? next_field(mode, &buf.data[size]) : NULL; |
|
786 |
if (cp == NULL) { |
|
787 |
nak(EBADOP); |
|
788 |
exit(1); |
|
789 |
} |
|
790 |
if (debug && standalone) { |
|
791 |
(void) fprintf(stderr, "%s for %s %s ", |
|
792 |
readmode ? "RRQ" : "WRQ", filename, mode); |
|
793 |
print_options(stderr, cp, size + buf.data - cp); |
|
794 |
(void) putc('\n', stderr); |
|
795 |
} |
|
796 |
for (pf = formats; pf->f_mode != NULL; pf++) |
|
797 |
if (strcasecmp(pf->f_mode, mode) == 0) |
|
798 |
break; |
|
799 |
if (pf->f_mode == NULL) { |
|
800 |
nak(EBADOP); |
|
801 |
exit(1); |
|
802 |
} |
|
803 |
||
804 |
/* |
|
805 |
* XXX fork a new process to handle this request before |
|
806 |
* chroot(), otherwise the parent won't be able to create a |
|
807 |
* new socket as that requires library access to system files |
|
808 |
* and devices. |
|
809 |
*/ |
|
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
810 |
(void) priv_set(PRIV_ON, PRIV_EFFECTIVE, PRIV_PROC_FORK, NULL); |
0 | 811 |
switch (fork()) { |
812 |
case -1: |
|
813 |
syslog(LOG_ERR, "fork (tftp): %m"); |
|
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
814 |
(void) priv_set(PRIV_OFF, PRIV_EFFECTIVE, PRIV_PROC_FORK, NULL); |
0 | 815 |
return; |
816 |
case 0: |
|
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
817 |
(void) priv_set(PRIV_OFF, PRIV_EFFECTIVE, PRIV_PROC_FORK, NULL); |
0 | 818 |
break; |
819 |
default: |
|
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
820 |
(void) priv_set(PRIV_OFF, PRIV_EFFECTIVE, PRIV_PROC_FORK, NULL); |
0 | 821 |
return; |
822 |
} |
|
823 |
||
824 |
/* |
|
825 |
* Try to see if we can access the file. The access can still |
|
826 |
* fail later if we are running in secure mode because of |
|
827 |
* the chroot() call. We only want to execute the chroot() once. |
|
828 |
*/ |
|
829 |
if (securetftp && firsttime) { |
|
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
830 |
(void) priv_set(PRIV_ON, PRIV_EFFECTIVE, PRIV_PROC_CHROOT, |
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
831 |
NULL); |
0 | 832 |
if (chroot(homedir) == -1) { |
833 |
syslog(LOG_ERR, |
|
834 |
"tftpd: cannot chroot to directory %s: %m\n", |
|
835 |
homedir); |
|
836 |
delay_exit(EACCESS); |
|
837 |
} |
|
838 |
else |
|
839 |
{ |
|
840 |
firsttime = B_FALSE; |
|
841 |
} |
|
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
842 |
(void) priv_set(PRIV_OFF, PRIV_EFFECTIVE, PRIV_PROC_CHROOT, |
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
843 |
NULL); |
0 | 844 |
(void) chdir("/"); /* cd to new root */ |
845 |
} |
|
11537
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
846 |
(void) priv_set(PRIV_OFF, PRIV_ALLSETS, PRIV_PROC_CHROOT, |
8eca52188202
PSARC 2009/686 Improving the use and debugging of the basic privilege set.
Casper H.S. Dik <Casper.Dik@Sun.COM>
parents:
8034
diff
changeset
|
847 |
PRIV_NET_PRIVADDR, NULL); |
0 | 848 |
|
849 |
ecode = (*pf->f_validate)(tp->th_opcode); |
|
850 |
if (ecode != 0) |
|
851 |
delay_exit(ecode); |
|
852 |
||
853 |
/* we don't use the descriptors passed in to the parent */ |
|
854 |
(void) close(STDIN_FILENO); |
|
855 |
(void) close(STDOUT_FILENO); |
|
856 |
||
857 |
/* |
|
858 |
* Try to open file as low-priv setuid/setgid. Note that |
|
859 |
* a chroot() has already been done. |
|
860 |
*/ |
|
861 |
fd = open(filename, |
|
862 |
(readmode ? O_RDONLY : (O_WRONLY|O_TRUNC)) | O_NONBLOCK); |
|
863 |
if ((fd < 0) || (fstat(fd, &statb) < 0)) |
|
864 |
delay_exit((errno == ENOENT) ? ENOTFOUND : EACCESS); |
|
865 |
||
866 |
if (((statb.st_mode & ((readmode) ? S_IROTH : S_IWOTH)) == 0) || |
|
867 |
((statb.st_mode & S_IFMT) != S_IFREG)) |
|
868 |
delay_exit(EACCESS); |
|
869 |
||
870 |
file = fdopen(fd, readmode ? "r" : "w"); |
|
871 |
if (file == NULL) |
|
872 |
delay_exit(errno + 100); |
|
873 |
||
874 |
/* Don't know the size of transfers which involve conversion */ |
|
875 |
tsize_set = (readmode && (pf->f_convert == 0)); |
|
876 |
if (tsize_set) |
|
877 |
tsize = statb.st_size; |
|
878 |
||
879 |
/* Deal with any options sent by the client */ |
|
880 |
oacklen = process_options(tp->th_opcode, cp, buf.data + size); |
|
881 |
||
882 |
if (tp->th_opcode == WRQ) |
|
883 |
(*pf->f_recv)(pf, oacklen); |
|
884 |
else |
|
885 |
(*pf->f_send)(pf, oacklen); |
|
886 |
||
887 |
exit(0); |
|
888 |
} |
|
889 |
||
890 |
/* |
|
891 |
* Maybe map filename into another one. |
|
892 |
* |
|
893 |
* For PNP, we get TFTP boot requests for filenames like |
|
894 |
* <Unknown Hex IP Addr>.<Architecture Name>. We must |
|
895 |
* map these to 'pnp.<Architecture Name>'. Note that |
|
896 |
* uppercase is mapped to lowercase in the architecture names. |
|
897 |
* |
|
898 |
* For names <Hex IP Addr> there are two cases. First, |
|
899 |
* it may be a buggy prom that omits the architecture code. |
|
900 |
* So first check if <Hex IP Addr>.<arch> is on the filesystem. |
|
901 |
* Second, this is how most Sun3s work; assume <arch> is sun3. |
|
902 |
*/ |
|
903 |
||
904 |
static char * |
|
905 |
pnp_check(char *origname) |
|
906 |
{ |
|
907 |
static char buf [MAXNAMLEN + 1]; |
|
908 |
char *arch, *s, *bufend; |
|
909 |
in_addr_t ipaddr; |
|
910 |
int len = (origname ? strlen(origname) : 0); |
|
911 |
DIR *dir; |
|
912 |
struct dirent *dp; |
|
913 |
||
914 |
if (securetftp || disable_pnp || len < 8 || len > 14) |
|
915 |
return (NULL); |
|
916 |
||
917 |
/* |
|
918 |
* XXX see if this cable allows pnp; if not, return NULL |
|
919 |
* Requires YP support for determining this! |
|
920 |
*/ |
|
921 |
||
922 |
ipaddr = htonl(strtol(origname, &arch, 16)); |
|
923 |
if ((arch == NULL) || (len > 8 && *arch != '.')) |
|
924 |
return (NULL); |
|
925 |
if (len == 8) |
|
926 |
arch = "SUN3"; |
|
927 |
else |
|
928 |
arch++; |
|
929 |
||
930 |
/* |
|
931 |
* Allow <Hex IP Addr>* filename request to to be |
|
932 |
* satisfied by <Hex IP Addr><Any Suffix> rather |
|
933 |
* than enforcing this to be Sun3 systems. Also serves |
|
934 |
* to make case of suffix a don't-care. |
|
935 |
*/ |
|
936 |
if ((dir = opendir(homedir)) == NULL) |
|
937 |
return (NULL); |
|
938 |
while ((dp = readdir(dir)) != NULL) { |
|
939 |
if (strncmp(origname, dp->d_name, 8) == 0) { |
|
940 |
(void) strlcpy(buf, dp->d_name, sizeof (buf)); |
|
941 |
(void) closedir(dir); |
|
942 |
return (buf); |
|
943 |
} |
|
944 |
} |
|
945 |
(void) closedir(dir); |
|
946 |
||
947 |
/* |
|
948 |
* XXX maybe call YP master for most current data iff |
|
949 |
* pnp is enabled. |
|
950 |
*/ |
|
951 |
||
952 |
/* |
|
953 |
* only do mapping PNP boot file name for machines that |
|
954 |
* are not in the hosts database. |
|
955 |
*/ |
|
956 |
if (gethostbyaddr((char *)&ipaddr, sizeof (ipaddr), AF_INET) != NULL) |
|
957 |
return (NULL); |
|
958 |
||
959 |
s = buf + strlcpy(buf, "pnp.", sizeof (buf)); |
|
960 |
bufend = &buf[sizeof (buf) - 1]; |
|
961 |
while ((*arch != '\0') && (s < bufend)) |
|
962 |
*s++ = tolower (*arch++); |
|
963 |
*s = '\0'; |
|
964 |
return (buf); |
|
965 |
} |
|
966 |
||
967 |
||
968 |
/* |
|
969 |
* Try to validate filename. If the filename doesn't exist try PNP mapping. |
|
970 |
*/ |
|
971 |
static int |
|
972 |
validate_filename(int mode) |
|
973 |
{ |
|
974 |
struct stat stbuf; |
|
975 |
char *origfile; |
|
976 |
||
977 |
if (stat(filename, &stbuf) < 0) { |
|
978 |
if (errno != ENOENT) |
|
979 |
return (EACCESS); |
|
980 |
if (mode == WRQ) |
|
981 |
return (ENOTFOUND); |
|
982 |
||
983 |
/* try to map requested filename into a pnp filename */ |
|
984 |
origfile = filename; |
|
985 |
filename = pnp_check(origfile); |
|
986 |
if (filename == NULL) |
|
987 |
return (ENOTFOUND); |
|
988 |
||
989 |
if (stat(filename, &stbuf) < 0) |
|
990 |
return (errno == ENOENT ? ENOTFOUND : EACCESS); |
|
991 |
syslog(LOG_NOTICE, "%s -> %s\n", origfile, filename); |
|
992 |
} |
|
993 |
||
994 |
return (0); |
|
995 |
} |
|
996 |
||
997 |
/* ARGSUSED */ |
|
998 |
static void |
|
999 |
timer(int signum) |
|
1000 |
{ |
|
1001 |
timeout += rexmtval; |
|
1002 |
if (timeout >= maxtimeout) |
|
1003 |
exit(1); |
|
1004 |
siglongjmp(timeoutbuf, 1); |
|
1005 |
} |
|
1006 |
||
1007 |
/* |
|
1008 |
* Send the requested file. |
|
1009 |
*/ |
|
1010 |
static void |
|
1011 |
tftpd_sendfile(struct formats *pf, int oacklen) |
|
1012 |
{ |
|
1013 |
struct tftphdr *dp; |
|
1926
d83c7a9aec2d
6301318 in.tftpd fails with files >32MB with default block size
as198278
parents:
0
diff
changeset
|
1014 |
volatile ushort_t block = 1; |
0 | 1015 |
int size, n, serrno; |
1016 |
||
1017 |
if (oacklen != 0) { |
|
1018 |
(void) sigset(SIGALRM, timer); |
|
1019 |
timeout = 0; |
|
1020 |
(void) sigsetjmp(timeoutbuf, 1); |
|
1021 |
if (debug && standalone) { |
|
1022 |
(void) fputs("Sending OACK ", stderr); |
|
1023 |
print_options(stderr, (char *)&oackbuf.hdr.th_stuff, |
|
1024 |
oacklen - 2); |
|
1025 |
(void) putc('\n', stderr); |
|
1026 |
} |
|
1027 |
if (sendto(peer, &oackbuf, oacklen, 0, |
|
1028 |
(struct sockaddr *)&from, fromplen) != oacklen) { |
|
1029 |
if (debug && standalone) { |
|
1030 |
serrno = errno; |
|
1031 |
perror("sendto (oack)"); |
|
1032 |
errno = serrno; |
|
1033 |
} |
|
1034 |
SYSLOG_MSG("sendto (oack): %m"); |
|
1035 |
goto abort; |
|
1036 |
} |
|
1037 |
(void) alarm(rexmtval); /* read the ack */ |
|
1038 |
for (;;) { |
|
1039 |
(void) sigrelse(SIGALRM); |
|
1040 |
n = recv(peer, &ackbuf, sizeof (ackbuf), 0); |
|
1041 |
(void) sighold(SIGALRM); |
|
1042 |
if (n < 0) { |
|
1043 |
if (errno == EINTR) |
|
1044 |
continue; |
|
1045 |
serrno = errno; |
|
1046 |
SYSLOG_MSG("recv (ack): %m"); |
|
1047 |
if (debug && standalone) { |
|
1048 |
errno = serrno; |
|
1049 |
perror("recv (ack)"); |
|
1050 |
} |
|
1051 |
goto abort; |
|
1052 |
} |
|
1053 |
ackbuf.tb_hdr.th_opcode = |
|
1054 |
ntohs((ushort_t)ackbuf.tb_hdr.th_opcode); |
|
1055 |
ackbuf.tb_hdr.th_block = |
|
1056 |
ntohs((ushort_t)ackbuf.tb_hdr.th_block); |
|
1057 |
||
1058 |
if (ackbuf.tb_hdr.th_opcode == ERROR) { |
|
1059 |
if (debug && standalone) { |
|
1060 |
(void) fprintf(stderr, |
|
1061 |
"received ERROR %d", |
|
1062 |
ackbuf.tb_hdr.th_code); |
|
1063 |
if (n > 4) |
|
1064 |
(void) fprintf(stderr, |
|
1065 |
" %.*s", n - 4, |
|
1066 |
ackbuf.tb_hdr.th_msg); |
|
1067 |
(void) putc('\n', stderr); |
|
1068 |
} |
|
1069 |
goto abort; |
|
1070 |
} |
|
1071 |
||
1072 |
if (ackbuf.tb_hdr.th_opcode == ACK) { |
|
1073 |
if (debug && standalone) |
|
1074 |
(void) fprintf(stderr, |
|
1075 |
"received ACK for block %d\n", |
|
1076 |
ackbuf.tb_hdr.th_block); |
|
1077 |
if (ackbuf.tb_hdr.th_block == 0) |
|
1078 |
break; |
|
1079 |
/* |
|
1080 |
* Don't resend the OACK, avoids getting stuck |
|
1081 |
* in an OACK/ACK loop if the client keeps |
|
1082 |
* replying with a bad ACK. Client will either |
|
1083 |
* send a good ACK or timeout sending bad ones. |
|
1084 |
*/ |
|
1085 |
} |
|
1086 |
} |
|
1087 |
cancel_alarm(); |
|
1088 |
} |
|
1089 |
dp = r_init(); |
|
1090 |
do { |
|
1091 |
(void) sigset(SIGALRM, timer); |
|
1092 |
size = readit(file, &dp, pf->f_convert); |
|
1093 |
if (size < 0) { |
|
1094 |
nak(errno + 100); |
|
1095 |
goto abort; |
|
1096 |
} |
|
1097 |
dp->th_opcode = htons((ushort_t)DATA); |
|
1098 |
dp->th_block = htons((ushort_t)block); |
|
1099 |
timeout = 0; |
|
1100 |
(void) sigsetjmp(timeoutbuf, 1); |
|
1101 |
if (debug && standalone) |
|
1102 |
(void) fprintf(stderr, "Sending DATA block %d\n", |
|
1103 |
block); |
|
1104 |
if (sendto(peer, dp, size + 4, 0, |
|
1105 |
(struct sockaddr *)&from, fromplen) != size + 4) { |
|
1106 |
if (debug && standalone) { |
|
1107 |
serrno = errno; |
|
1108 |
perror("sendto (data)"); |
|
1109 |
errno = serrno; |
|
1110 |
} |
|
1111 |
SYSLOG_MSG("sendto (data): %m"); |
|
1112 |
goto abort; |
|
1113 |
} |
|
1114 |
read_ahead(file, pf->f_convert); |
|
1115 |
(void) alarm(rexmtval); /* read the ack */ |
|
1116 |
for (;;) { |
|
1117 |
(void) sigrelse(SIGALRM); |
|
1118 |
n = recv(peer, &ackbuf, sizeof (ackbuf), 0); |
|
1119 |
(void) sighold(SIGALRM); |
|
1120 |
if (n < 0) { |
|
1121 |
if (errno == EINTR) |
|
1122 |
continue; |
|
1123 |
serrno = errno; |
|
1124 |
SYSLOG_MSG("recv (ack): %m"); |
|
1125 |
if (debug && standalone) { |
|
1126 |
errno = serrno; |
|
1127 |
perror("recv (ack)"); |
|
1128 |
} |
|
1129 |
goto abort; |
|
1130 |
} |
|
1131 |
ackbuf.tb_hdr.th_opcode = |
|
1132 |
ntohs((ushort_t)ackbuf.tb_hdr.th_opcode); |
|
1133 |
ackbuf.tb_hdr.th_block = |
|
1134 |
ntohs((ushort_t)ackbuf.tb_hdr.th_block); |
|
1135 |
||
1136 |
if (ackbuf.tb_hdr.th_opcode == ERROR) { |
|
1137 |
if (debug && standalone) { |
|
1138 |
(void) fprintf(stderr, |
|
1139 |
"received ERROR %d", |
|
1140 |
ackbuf.tb_hdr.th_code); |
|
1141 |
if (n > 4) |
|
1142 |
(void) fprintf(stderr, |
|
1143 |
" %.*s", n - 4, |
|
1144 |
ackbuf.tb_hdr.th_msg); |
|
1145 |
(void) putc('\n', stderr); |
|
1146 |
} |
|
1147 |
goto abort; |
|
1148 |
} |
|
1149 |
||
1150 |
if (ackbuf.tb_hdr.th_opcode == ACK) { |
|
1151 |
if (debug && standalone) |
|
1152 |
(void) fprintf(stderr, |
|
4921 | 1153 |
"received ACK for block %d\n", |
1154 |
ackbuf.tb_hdr.th_block); |
|
0 | 1155 |
if (ackbuf.tb_hdr.th_block == block) { |
1156 |
break; |
|
1157 |
} |
|
1158 |
/* |
|
1159 |
* Never resend the current DATA packet on |
|
1160 |
* receipt of a duplicate ACK, doing so would |
|
1161 |
* cause the "Sorcerer's Apprentice Syndrome". |
|
1162 |
*/ |
|
1163 |
} |
|
1164 |
} |
|
1165 |
cancel_alarm(); |
|
1166 |
block++; |
|
1167 |
} while (size == blocksize); |
|
1168 |
||
1169 |
abort: |
|
1170 |
cancel_alarm(); |
|
1171 |
(void) fclose(file); |
|
1172 |
} |
|
1173 |
||
1174 |
/* ARGSUSED */ |
|
1175 |
static void |
|
1176 |
justquit(int signum) |
|
1177 |
{ |
|
1178 |
exit(0); |
|
1179 |
} |
|
1180 |
||
1181 |
/* |
|
1182 |
* Receive a file. |
|
1183 |
*/ |
|
1184 |
static void |
|
1185 |
tftpd_recvfile(struct formats *pf, int oacklen) |
|
1186 |
{ |
|
1187 |
struct tftphdr *dp; |
|
1188 |
struct tftphdr *ap; /* ack buffer */ |
|
1926
d83c7a9aec2d
6301318 in.tftpd fails with files >32MB with default block size
as198278
parents:
0
diff
changeset
|
1189 |
ushort_t block = 0; |
d83c7a9aec2d
6301318 in.tftpd fails with files >32MB with default block size
as198278
parents:
0
diff
changeset
|
1190 |
int n, size, acklen, serrno; |
0 | 1191 |
|
1192 |
dp = w_init(); |
|
1193 |
ap = &ackbuf.tb_hdr; |
|
1194 |
do { |
|
1195 |
(void) sigset(SIGALRM, timer); |
|
1196 |
timeout = 0; |
|
1197 |
if (oacklen == 0) { |
|
1198 |
ap->th_opcode = htons((ushort_t)ACK); |
|
1199 |
ap->th_block = htons((ushort_t)block); |
|
1200 |
acklen = 4; |
|
1201 |
} else { |
|
1202 |
/* copy OACK packet to the ack buffer ready to send */ |
|
1203 |
(void) memcpy(&ackbuf, &oackbuf, oacklen); |
|
1204 |
acklen = oacklen; |
|
1205 |
oacklen = 0; |
|
1206 |
} |
|
1207 |
block++; |
|
1208 |
(void) sigsetjmp(timeoutbuf, 1); |
|
1209 |
send_ack: |
|
1210 |
if (debug && standalone) { |
|
1211 |
if (ap->th_opcode == htons((ushort_t)ACK)) { |
|
1212 |
(void) fprintf(stderr, |
|
1213 |
"Sending ACK for block %d\n", block - 1); |
|
1214 |
} else { |
|
1215 |
(void) fprintf(stderr, "Sending OACK "); |
|
1216 |
print_options(stderr, (char *)&ap->th_stuff, |
|
1217 |
acklen - 2); |
|
1218 |
(void) putc('\n', stderr); |
|
1219 |
} |
|
1220 |
} |
|
1221 |
if (sendto(peer, &ackbuf, acklen, 0, (struct sockaddr *)&from, |
|
1222 |
fromplen) != acklen) { |
|
1223 |
if (ap->th_opcode == htons((ushort_t)ACK)) { |
|
1224 |
if (debug && standalone) { |
|
1225 |
serrno = errno; |
|
1226 |
perror("sendto (ack)"); |
|
1227 |
errno = serrno; |
|
1228 |
} |
|
1229 |
syslog(LOG_ERR, "sendto (ack): %m\n"); |
|
1230 |
} else { |
|
1231 |
if (debug && standalone) { |
|
1232 |
serrno = errno; |
|
1233 |
perror("sendto (oack)"); |
|
1234 |
errno = serrno; |
|
1235 |
} |
|
1236 |
syslog(LOG_ERR, "sendto (oack): %m\n"); |
|
1237 |
} |
|
1238 |
goto abort; |
|
1239 |
} |
|
1240 |
if (write_behind(file, pf->f_convert) < 0) { |
|
1241 |
nak(errno + 100); |
|
1242 |
goto abort; |
|
1243 |
} |
|
1244 |
(void) alarm(rexmtval); |
|
1245 |
for (;;) { |
|
1246 |
(void) sigrelse(SIGALRM); |
|
1247 |
n = recv(peer, dp, blocksize + 4, 0); |
|
1248 |
(void) sighold(SIGALRM); |
|
1249 |
if (n < 0) { /* really? */ |
|
1250 |
if (errno == EINTR) |
|
1251 |
continue; |
|
1252 |
syslog(LOG_ERR, "recv (data): %m"); |
|
1253 |
goto abort; |
|
1254 |
} |
|
1255 |
dp->th_opcode = ntohs((ushort_t)dp->th_opcode); |
|
1256 |
dp->th_block = ntohs((ushort_t)dp->th_block); |
|
1257 |
if (dp->th_opcode == ERROR) { |
|
1258 |
cancel_alarm(); |
|
1259 |
if (debug && standalone) { |
|
1260 |
(void) fprintf(stderr, |
|
1261 |
"received ERROR %d", dp->th_code); |
|
1262 |
if (n > 4) |
|
1263 |
(void) fprintf(stderr, |
|
1264 |
" %.*s", n - 4, dp->th_msg); |
|
1265 |
(void) putc('\n', stderr); |
|
1266 |
} |
|
1267 |
return; |
|
1268 |
} |
|
1269 |
if (dp->th_opcode == DATA) { |
|
1270 |
if (debug && standalone) |
|
1271 |
(void) fprintf(stderr, |
|
4921 | 1272 |
"Received DATA block %d\n", |
1273 |
dp->th_block); |
|
0 | 1274 |
if (dp->th_block == block) { |
1275 |
break; /* normal */ |
|
1276 |
} |
|
1277 |
/* Re-synchronize with the other side */ |
|
1278 |
if (synchnet(peer) < 0) { |
|
1279 |
nak(errno + 100); |
|
1280 |
goto abort; |
|
1281 |
} |
|
1282 |
if (dp->th_block == (block-1)) |
|
1283 |
goto send_ack; /* rexmit */ |
|
1284 |
} |
|
1285 |
} |
|
1286 |
cancel_alarm(); |
|
1287 |
/* size = write(file, dp->th_data, n - 4); */ |
|
1288 |
size = writeit(file, &dp, n - 4, pf->f_convert); |
|
1289 |
if (size != (n - 4)) { |
|
1290 |
nak((size < 0) ? (errno + 100) : ENOSPACE); |
|
1291 |
goto abort; |
|
1292 |
} |
|
1293 |
} while (size == blocksize); |
|
1294 |
if (write_behind(file, pf->f_convert) < 0) { |
|
1295 |
nak(errno + 100); |
|
1296 |
goto abort; |
|
1297 |
} |
|
1298 |
n = fclose(file); /* close data file */ |
|
1299 |
file = NULL; |
|
1300 |
if (n == EOF) { |
|
1301 |
nak(errno + 100); |
|
1302 |
goto abort; |
|
1303 |
} |
|
1304 |
||
1305 |
ap->th_opcode = htons((ushort_t)ACK); /* send the "final" ack */ |
|
1306 |
ap->th_block = htons((ushort_t)(block)); |
|
1307 |
if (debug && standalone) |
|
1308 |
(void) fprintf(stderr, "Sending ACK for block %d\n", block); |
|
1309 |
if (sendto(peer, &ackbuf, 4, 0, (struct sockaddr *)&from, |
|
1310 |
fromplen) == -1) { |
|
1311 |
if (debug && standalone) |
|
1312 |
perror("sendto (ack)"); |
|
1313 |
} |
|
1314 |
(void) sigset(SIGALRM, justquit); /* just quit on timeout */ |
|
1315 |
(void) alarm(rexmtval); |
|
1316 |
/* normally times out and quits */ |
|
1317 |
n = recv(peer, dp, blocksize + 4, 0); |
|
1318 |
(void) alarm(0); |
|
1319 |
dp->th_opcode = ntohs((ushort_t)dp->th_opcode); |
|
1320 |
dp->th_block = ntohs((ushort_t)dp->th_block); |
|
1321 |
if (n >= 4 && /* if read some data */ |
|
1322 |
dp->th_opcode == DATA && /* and got a data block */ |
|
1323 |
block == dp->th_block) { /* then my last ack was lost */ |
|
1324 |
if (debug && standalone) { |
|
1325 |
(void) fprintf(stderr, "Sending ACK for block %d\n", |
|
1326 |
block); |
|
1327 |
} |
|
1328 |
/* resend final ack */ |
|
1329 |
if (sendto(peer, &ackbuf, 4, 0, (struct sockaddr *)&from, |
|
1330 |
fromplen) == -1) { |
|
1331 |
if (debug && standalone) |
|
1332 |
perror("sendto (last ack)"); |
|
1333 |
} |
|
1334 |
} |
|
1335 |
||
1336 |
abort: |
|
1337 |
cancel_alarm(); |
|
1338 |
if (file != NULL) |
|
1339 |
(void) fclose(file); |
|
1340 |
} |
|
1341 |
||
1342 |
/* |
|
1343 |
* Send a nak packet (error message). |
|
1344 |
* Error code passed in is one of the |
|
1345 |
* standard TFTP codes, or a UNIX errno |
|
1346 |
* offset by 100. |
|
1347 |
* Handles connected as well as unconnected peer. |
|
1348 |
*/ |
|
1349 |
static void |
|
1350 |
nak(int error) |
|
1351 |
{ |
|
1352 |
struct tftphdr *tp; |
|
1353 |
int length; |
|
1354 |
struct errmsg *pe; |
|
1355 |
int ret; |
|
1356 |
||
1357 |
tp = &buf.hdr; |
|
1358 |
tp->th_opcode = htons((ushort_t)ERROR); |
|
1359 |
tp->th_code = htons((ushort_t)error); |
|
1360 |
for (pe = errmsgs; pe->e_code >= 0; pe++) |
|
1361 |
if (pe->e_code == error) |
|
1362 |
break; |
|
1363 |
if (pe->e_code < 0) { |
|
1364 |
pe->e_msg = strerror(error - 100); |
|
1365 |
tp->th_code = EUNDEF; /* set 'undef' errorcode */ |
|
1366 |
} |
|
1367 |
(void) strlcpy(tp->th_msg, (pe->e_msg != NULL) ? pe->e_msg : "UNKNOWN", |
|
1368 |
sizeof (buf) - sizeof (struct tftphdr)); |
|
1369 |
length = strlen(tp->th_msg); |
|
1370 |
length += sizeof (struct tftphdr); |
|
1371 |
if (debug && standalone) |
|
1372 |
(void) fprintf(stderr, "Sending NAK: %s\n", tp->th_msg); |
|
1373 |
||
1374 |
ret = sendto(peer, &buf, length, 0, (struct sockaddr *)&from, |
|
1375 |
fromplen); |
|
1376 |
if (ret == -1 && errno == EISCONN) { |
|
1377 |
/* Try without an address */ |
|
1378 |
ret = send(peer, &buf, length, 0); |
|
1379 |
} |
|
1380 |
if (ret == -1) { |
|
1381 |
if (standalone) |
|
1382 |
perror("sendto (nak)"); |
|
1383 |
else |
|
1384 |
syslog(LOG_ERR, "tftpd: nak: %m\n"); |
|
1385 |
} else if (ret != length) { |
|
1386 |
if (standalone) |
|
1387 |
perror("sendto (nak) lost data"); |
|
1388 |
else |
|
1389 |
syslog(LOG_ERR, "tftpd: nak: %d lost\n", length - ret); |
|
1390 |
} |
|
1391 |
} |