+++ /dev/null
-/*
- * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
- * Reserved. This file contains Original Code and/or Modifications of
- * Original Code as defined in and that are subject to the Apple Public
- * Source License Version 1.0 (the 'License'). You may not use this file
- * except in compliance with the License. Please obtain a copy of the
- * License at http://www.apple.com/publicsource and read it before using
- * this file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License."
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-/* $NetBSD: tftpd.c,v 1.28 2004/05/05 20:15:45 kleink Exp $ */
-/*
- * Copyright (c) 1983, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <sys/cdefs.h>
-#ifndef lint
-__COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
- The Regents of the University of California. All rights reserved.\n");
-#if 0
-static char sccsid[] = "@(#)tftpd.c 8.1 (Berkeley) 6/4/93";
-#else
-__RCSID("$NetBSD: tftpd.c,v 1.28 2004/05/05 20:15:45 kleink Exp $");
-#endif
-#endif /* not lint */
-
-/*
- * Trivial file transfer protocol server.
- *
- * This version includes many modifications by Jim Guyton
- * <guyton@rand-unix>.
- */
-
-#include <sys/param.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/socket.h>
-
-#include <netinet/in.h>
-#include "tftp.h"
-#include <arpa/inet.h>
-
-#include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <grp.h>
-#include <netdb.h>
-#include <pwd.h>
-#include <setjmp.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <syslog.h>
-#include <time.h>
-#include <unistd.h>
-
-#include "tftpsubs.h"
-
-#define DEFAULTUSER "nobody"
-
-#define TIMEOUT 5
-
-int peer;
-int rexmtval = TIMEOUT;
-int maxtimeout = 5*TIMEOUT;
-
-char buf[MAXPKTSIZE];
-char ackbuf[PKTSIZE];
-char oackbuf[PKTSIZE];
-struct sockaddr_storage from;
-int fromlen;
-int debug;
-
-int tftp_opt_tsize = 0;
-int tftp_blksize = SEGSIZE;
-int tftp_tsize = 0;
-
-/*
- * Null-terminated directory prefix list for absolute pathname requests and
- * search list for relative pathname requests.
- *
- * MAXDIRS should be at least as large as the number of arguments that
- * inetd allows (currently 20).
- */
-#define MAXDIRS 20
-static struct dirlist {
- char *name;
- int len;
-} dirs[MAXDIRS+1];
-static int suppress_naks;
-static int logging;
-static int insecure=0;
-static int secure;
-static char *securedir;
-
-struct formats;
-
-static const char *errtomsg(int);
-static void nak(int);
-static void tftp(struct tftphdr *, int);
-static void usage(void);
-static char *verifyhost(struct sockaddr *);
-void justquit(int);
-int main(int, char **);
-void recvfile(struct formats *, int, int);
-void sendfile(struct formats *, int, int);
-void timer(int);
-static const char *opcode(int);
-int validate_access(char **, int);
-
-struct formats {
- const char *f_mode;
- int (*f_validate)(char **, int);
- void (*f_send)(struct formats *, int, int);
- void (*f_recv)(struct formats *, int, int);
- int f_convert;
-} formats[] = {
- { "netascii", validate_access, sendfile, recvfile, 1 },
- { "octet", validate_access, sendfile, recvfile, 0 },
- { 0 }
-};
-
-static void
-usage(void)
-{
-
- syslog(LOG_ERR,
- "Usage: %s [-diln] [-u user] [-g group] [-s directory] [directory ...]",
- getprogname());
- exit(1);
-}
-
-int
-main(int argc, char *argv[])
-{
- struct sockaddr_storage me;
- struct passwd *pwent;
- struct group *grent;
- struct tftphdr *tp;
- char *tgtuser, *tgtgroup, *ep;
- int n, ch, on, fd;
- int len, soopt;
- uid_t curuid, tgtuid;
- gid_t curgid, tgtgid;
- long nid;
-
- n = 0;
- fd = 0;
- tzset();
- openlog("tftpd", LOG_PID | LOG_NDELAY, LOG_DAEMON);
- tgtuser = DEFAULTUSER;
- tgtgroup = NULL;
- curuid = getuid();
- curgid = getgid();
-
- while ((ch = getopt(argc, argv, "dg:ilns:u:")) != -1)
- switch (ch) {
- case 'd':
- debug++;
- break;
-
- case 'g':
- tgtgroup = optarg;
- break;
-
- case 'i':
- insecure = 1;
- break;
-
- case 'l':
- logging = 1;
- break;
-
- case 'n':
- suppress_naks = 1;
- break;
-
- case 's':
- secure = 1;
- securedir = optarg;
- break;
-
- case 'u':
- tgtuser = optarg;
- break;
-
- default:
- usage();
- break;
- }
-
- if (optind < argc) {
- struct dirlist *dirp;
-
- /* Get list of directory prefixes. Skip relative pathnames. */
- for (dirp = dirs; optind < argc && dirp < &dirs[MAXDIRS];
- optind++) {
- if (argv[optind][0] == '/') {
- dirp->name = argv[optind];
- dirp->len = strlen(dirp->name);
- dirp++;
- }
- }
- }
-
- if (*tgtuser == '\0' || (tgtgroup != NULL && *tgtgroup == '\0'))
- usage();
-
- nid = (strtol(tgtuser, &ep, 10));
- if (*ep == '\0') {
- if (nid > UID_MAX) {
- syslog(LOG_ERR, "uid %ld is too large", nid);
- exit(1);
- }
- pwent = getpwuid((uid_t)nid);
- } else
- pwent = getpwnam(tgtuser);
- if (pwent == NULL) {
- syslog(LOG_ERR, "unknown user `%s'", tgtuser);
- exit(1);
- }
- tgtuid = pwent->pw_uid;
- tgtgid = pwent->pw_gid;
-
- if (tgtgroup != NULL) {
- nid = (strtol(tgtgroup, &ep, 10));
- if (*ep == '\0') {
- if (nid > GID_MAX) {
- syslog(LOG_ERR, "gid %ld is too large", nid);
- exit(1);
- }
- grent = getgrgid((gid_t)nid);
- } else
- grent = getgrnam(tgtgroup);
- if (grent != NULL)
- tgtgid = grent->gr_gid;
- else {
- syslog(LOG_ERR, "unknown group `%s'", tgtgroup);
- exit(1);
- }
- }
-
- if (secure) {
- if (chdir(securedir) < 0) {
- syslog(LOG_ERR, "chdir %s: %m", securedir);
- exit(1);
- }
- if (chroot(".")) {
- syslog(LOG_ERR, "chroot: %m");
- exit(1);
- }
- }
-
- if (logging)
- syslog(LOG_DEBUG, "running as user `%s' (%d), group `%s' (%d)",
- tgtuser, tgtuid, tgtgroup ? tgtgroup : "(unspecified)",
- tgtgid);
- if (curgid != tgtgid) {
- if (setgid(tgtgid)) {
- syslog(LOG_ERR, "setgid to %d: %m", (int)tgtgid);
- exit(1);
- }
- if (setgroups(0, NULL)) {
- syslog(LOG_ERR, "setgroups: %m");
- exit(1);
- }
- }
-
- if (curuid != tgtuid) {
- if (setuid(tgtuid)) {
- syslog(LOG_ERR, "setuid to %d: %m", (int)tgtuid);
- exit(1);
- }
- }
-
- on = 1;
- if (ioctl(fd, FIONBIO, &on) < 0) {
- syslog(LOG_ERR, "ioctl(FIONBIO): %m");
- exit(1);
- }
- fromlen = sizeof (from);
- n = recvfrom(fd, buf, sizeof (buf), 0,
- (struct sockaddr *)&from, &fromlen);
- if (n < 0) {
- syslog(LOG_ERR, "recvfrom: %m");
- exit(1);
- }
- /*
- * Now that we have read the message out of the UDP
- * socket, we fork and exit. Thus, inetd will go back
- * to listening to the tftp port, and the next request
- * to come in will start up a new instance of tftpd.
- *
- * We do this so that inetd can run tftpd in "wait" mode.
- * The problem with tftpd running in "nowait" mode is that
- * inetd may get one or more successful "selects" on the
- * tftp port before we do our receive, so more than one
- * instance of tftpd may be started up. Worse, if tftpd
- * break before doing the above "recvfrom", inetd would
- * spawn endless instances, clogging the system.
- */
- {
- int pid;
- int i, j;
-
- for (i = 1; i < 20; i++) {
- pid = fork();
- if (pid < 0) {
- sleep(i);
- /*
- * flush out to most recently sent request.
- *
- * This may drop some request, but those
- * will be resent by the clients when
- * they timeout. The positive effect of
- * this flush is to (try to) prevent more
- * than one tftpd being started up to service
- * a single request from a single client.
- */
- j = sizeof from;
- i = recvfrom(fd, buf, sizeof (buf), 0,
- (struct sockaddr *)&from, &j);
- if (i > 0) {
- n = i;
- fromlen = j;
- }
- } else {
- break;
- }
- }
- if (pid < 0) {
- syslog(LOG_ERR, "fork: %m");
- exit(1);
- } else if (pid != 0) {
- exit(0);
- }
- }
-
- /*
- * remember what address this was sent to, so we can respond on the
- * same interface
- */
- len = sizeof(me);
- if (getsockname(fd, (struct sockaddr *)&me, &len) == 0) {
- switch (me.ss_family) {
- case AF_INET:
- ((struct sockaddr_in *)&me)->sin_port = 0;
- break;
- case AF_INET6:
- ((struct sockaddr_in6 *)&me)->sin6_port = 0;
- break;
- default:
- /* unsupported */
- break;
- }
- } else {
- memset(&me, 0, sizeof(me));
- me.ss_family = from.ss_family;
- me.ss_len = from.ss_len;
- }
-
- alarm(0);
- close(fd);
- close(1);
- peer = socket(from.ss_family, SOCK_DGRAM, 0);
- if (peer < 0) {
- syslog(LOG_ERR, "socket: %m");
- exit(1);
- }
- if (bind(peer, (struct sockaddr *)&me, me.ss_len) < 0) {
- syslog(LOG_ERR, "bind: %m");
- exit(1);
- }
- if (connect(peer, (struct sockaddr *)&from, from.ss_len) < 0) {
- syslog(LOG_ERR, "connect: %m");
- exit(1);
- }
- soopt = 65536; /* larger than we'll ever need */
- if (setsockopt(peer, SOL_SOCKET, SO_SNDBUF, (void *) &soopt, sizeof(soopt)) < 0) {
- syslog(LOG_ERR, "set SNDBUF: %m");
- exit(1);
- }
- if (setsockopt(peer, SOL_SOCKET, SO_RCVBUF, (void *) &soopt, sizeof(soopt)) < 0) {
- syslog(LOG_ERR, "set RCVBUF: %m");
- exit(1);
- }
-
- tp = (struct tftphdr *)buf;
- tp->th_opcode = ntohs(tp->th_opcode);
- if (tp->th_opcode == RRQ || tp->th_opcode == WRQ)
- tftp(tp, n);
- exit(1);
-}
-
-static int
-blk_handler(struct tftphdr *tp, char *opt, char *val, char *ack,
- int *ackl, int *ec)
-{
- unsigned long bsize;
- char *endp;
- int l;
-
- /*
- * On these failures, we could just ignore the blocksize option.
- * Perhaps that should be a command-line option.
- */
- errno = 0;
- bsize = strtoul(val, &endp, 10);
- if ((bsize == ULONG_MAX && errno == ERANGE) || *endp) {
- syslog(LOG_NOTICE, "%s: %s request for %s: "
- "illegal value %s for blksize option",
- verifyhost((struct sockaddr *)&from),
- tp->th_opcode == WRQ ? "write" : "read",
- tp->th_stuff, val);
- return 0;
- }
- if (bsize < 8 || bsize > 65464) {
- syslog(LOG_NOTICE, "%s: %s request for %s: "
- "out of range value %s for blksize option",
- verifyhost((struct sockaddr *)&from),
- tp->th_opcode == WRQ ? "write" : "read",
- tp->th_stuff, val);
- return 0;
- }
-
- tftp_blksize = bsize;
- strcpy(ack + *ackl, "blksize");
- *ackl += 8;
- l = sprintf(ack + *ackl, "%lu", bsize);
- *ackl += l + 1;
-
- return 0;
-}
-
-static int
-timeout_handler(struct tftphdr *tp, char *opt, char *val, char *ack,
- int *ackl, int *ec)
-{
- unsigned long tout;
- char *endp;
- int l;
-
- errno = 0;
- tout = strtoul(val, &endp, 10);
- if ((tout == ULONG_MAX && errno == ERANGE) || *endp) {
- syslog(LOG_NOTICE, "%s: %s request for %s: "
- "illegal value %s for timeout option",
- verifyhost((struct sockaddr *)&from),
- tp->th_opcode == WRQ ? "write" : "read",
- tp->th_stuff, val);
- return 0;
- }
- if (tout < 1 || tout > 255) {
- syslog(LOG_NOTICE, "%s: %s request for %s: "
- "out of range value %s for timeout option",
- verifyhost((struct sockaddr *)&from),
- tp->th_opcode == WRQ ? "write" : "read",
- tp->th_stuff, val);
- return 0;
- }
-
- rexmtval = tout;
- strcpy(ack + *ackl, "timeout");
- *ackl += 8;
- l = sprintf(ack + *ackl, "%lu", tout);
- *ackl += l + 1;
-
- /*
- * Arbitrarily pick a maximum timeout on a request to 3
- * retransmissions if the interval timeout is more than
- * one minute. Longest possible timeout is therefore
- * 3 * 255 - 1, or 764 seconds.
- */
- if (rexmtval > 60) {
- maxtimeout = rexmtval * 3;
- } else {
- maxtimeout = rexmtval * 5;
- }
-
- return 0;
-}
-
-static int
-tsize_handler(struct tftphdr *tp, char *opt, char *val, char *ack,
- int *ackl, int *ec)
-{
- unsigned long fsize;
- char *endp;
-
- /*
- * Maximum file even with extended tftp is 65535 blocks of
- * length 65464, or 4290183240 octets (4784056 less than 2^32).
- * unsigned long is at least 32 bits on all NetBSD archs.
- */
-
- errno = 0;
- fsize = strtoul(val, &endp, 10);
- if ((fsize == ULONG_MAX && errno == ERANGE) || *endp) {
- syslog(LOG_NOTICE, "%s: %s request for %s: "
- "illegal value %s for tsize option",
- verifyhost((struct sockaddr *)&from),
- tp->th_opcode == WRQ ? "write" : "read",
- tp->th_stuff, val);
- return 0;
- }
- if (fsize > (unsigned long) 65535 * 65464) {
- syslog(LOG_NOTICE, "%s: %s request for %s: "
- "out of range value %s for tsize option",
- verifyhost((struct sockaddr *)&from),
- tp->th_opcode == WRQ ? "write" : "read",
- tp->th_stuff, val);
- return 0;
- }
-
- tftp_opt_tsize = 1;
- tftp_tsize = fsize;
- /*
- * We will report this later -- either replying with the fsize (WRQ)
- * or replying with the actual filesize (RRQ).
- */
-
- return 0;
-}
-
-struct tftp_options {
- char *o_name;
- int (*o_handler)(struct tftphdr *, char *, char *, char *,
- int *, int *);
-} options[] = {
- { "blksize", blk_handler },
- { "timeout", timeout_handler },
- { "tsize", tsize_handler },
- { NULL, NULL }
-};
-
-/*
- * Get options for an extended tftp session. Stuff the ones we
- * recognize in oackbuf.
- */
-static int
-get_options(struct tftphdr *tp, char *cp, int size, char *ackb,
- int *alen, int *err)
-{
- struct tftp_options *op;
- char *option, *value, *endp;
- int r, rv=0, ec=0;
-
- endp = cp + size;
- while (cp < endp) {
- option = cp;
- while (*cp && cp < endp) {
- *cp = tolower(*cp);
- cp++;
- }
- if (*cp) {
- /* if we have garbage at the end, just ignore it */
- break;
- }
- cp++; /* skip over NUL */
- value = cp;
- while (*cp && cp < endp) {
- cp++;
- }
- if (*cp) {
- /* if we have garbage at the end, just ignore it */
- break;
- }
- cp++;
- for (op = options; op->o_name; op++) {
- if (strcmp(op->o_name, option) == 0)
- break;
- }
- if (op->o_name) {
- r = op->o_handler(tp, option, value, ackb, alen, &ec);
- if (r < 0) {
- rv = -1;
- break;
- }
- rv++;
- } /* else ignore unknown options */
- }
-
- if (rv < 0)
- *err = ec;
-
- return rv;
-}
-
-/*
- * Handle initial connection protocol.
- */
-static void
-tftp(struct tftphdr *tp, int size)
-{
- struct formats *pf;
- char *cp;
- char *filename, *mode;
- int first, ecode, alen, etftp=0, r;
-
- first = 1;
- mode = NULL;
-
- filename = cp = tp->th_stuff;
-again:
- while (cp < buf + size) {
- if (*cp == '\0')
- break;
- cp++;
- }
- if (*cp != '\0') {
- nak(EBADOP);
- exit(1);
- }
- if (first) {
- mode = ++cp;
- first = 0;
- goto again;
- }
- for (cp = mode; *cp; cp++)
- if (isupper(*cp))
- *cp = tolower(*cp);
- for (pf = formats; pf->f_mode; pf++)
- if (strcmp(pf->f_mode, mode) == 0)
- break;
- if (pf->f_mode == 0) {
- nak(EBADOP);
- exit(1);
- }
- /*
- * cp currently points to the NUL byte following the mode.
- *
- * If we have some valid options, then let's assume that we're
- * now dealing with an extended tftp session. Note that if we
- * don't get any options, then we *must* assume that we do not
- * have an extended tftp session. If we get options, we fill
- * in the ack buf to acknowledge them. If we skip that, then
- * the client *must* assume that we are not using an extended
- * session.
- */
- size -= (++cp - (char *) tp);
- if (size > 0 && *cp) {
- alen = 2; /* Skip over opcode */
- r = get_options(tp, cp, size, oackbuf, &alen, &ecode);
- if (r > 0) {
- etftp = 1;
- } else if (r < 0) {
- nak(ecode);
- exit(1);
- }
- }
- ecode = (*pf->f_validate)(&filename, tp->th_opcode);
- if (logging) {
- syslog(LOG_INFO, "%s: %s request for %s: %s",
- verifyhost((struct sockaddr *)&from),
- tp->th_opcode == WRQ ? "write" : "read",
- filename, errtomsg(ecode));
- }
- if (ecode) {
- /*
- * Avoid storms of naks to a RRQ broadcast for a relative
- * bootfile pathname from a diskless Sun.
- */
- if (suppress_naks && *filename != '/' && ecode == ENOTFOUND)
- exit(0);
- nak(ecode);
- exit(1);
- }
-
- if (etftp) {
- struct tftphdr *oack_h;
-
- if (tftp_opt_tsize) {
- int l;
-
- strcpy(oackbuf + alen, "tsize");
- alen += 6;
- l = sprintf(oackbuf + alen, "%u", tftp_tsize);
- alen += l + 1;
- }
- oack_h = (struct tftphdr *) oackbuf;
- oack_h->th_opcode = htons(OACK);
- }
-
- if (tp->th_opcode == WRQ)
- (*pf->f_recv)(pf, etftp, alen);
- else
- (*pf->f_send)(pf, etftp, alen);
- exit(0);
-}
-
-
-FILE *file;
-
-/*
- * Validate file access. Since we
- * have no uid or gid, for now require
- * file to exist and be publicly
- * readable/writable.
- * If we were invoked with arguments
- * from inetd then the file must also be
- * in one of the given directory prefixes.
- */
-int
-validate_access(char **filep, int mode)
-{
- struct stat stbuf;
- struct dirlist *dirp;
- static char pathname[MAXPATHLEN];
- int fd;
- char *filename;
-#ifdef __APPLE__
- static char resolved_path[PATH_MAX+1];
- bzero(resolved_path,PATH_MAX+1);
- if(insecure) {
- filename = *filep;
- } else {
- if (realpath(*filep, resolved_path)==NULL) {
- return (EACCESS);
- }
- filename = resolved_path;
- }
-#else
- filename = *filep;
-#endif
- /*
- * Prevent tricksters from getting around the directory restrictions
- */
- if (strstr(filename, "/../"))
- return (EACCESS);
-
- if (*filename == '/') {
- /*
- * Allow the request if it's in one of the approved locations.
- * Special case: check the null prefix ("/") by looking
- * for length = 1 and relying on the arg. processing that
- * it's a /.
- */
- for (dirp = dirs; dirp->name != NULL; dirp++) {
- if (dirp->len == 1 ||
- (!strncmp(filename, dirp->name, dirp->len) &&
- filename[dirp->len] == '/'))
- break;
- }
- /* If directory list is empty, allow access to any file */
- if (dirp->name == NULL && dirp != dirs)
- return (EACCESS);
- if (stat(filename, &stbuf) < 0)
- return (errno == ENOENT ? ENOTFOUND : EACCESS);
- if (!S_ISREG(stbuf.st_mode))
- return (ENOTFOUND);
- if (mode == RRQ) {
- if ((stbuf.st_mode & S_IROTH) == 0)
- return (EACCESS);
- } else {
- if ((stbuf.st_mode & S_IWOTH) == 0)
- return (EACCESS);
- }
- } else {
- /*
- * Relative file name: search the approved locations for it.
- */
-
- if (!strncmp(filename, "../", 3))
- return (EACCESS);
-
- /*
- * Find the first file that exists in any of the directories,
- * check access on it.
- */
- if (dirs[0].name != NULL) {
- for (dirp = dirs; dirp->name != NULL; dirp++) {
- snprintf(pathname, sizeof pathname, "%s/%s",
- dirp->name, filename);
- if (stat(pathname, &stbuf) == 0 &&
- (stbuf.st_mode & S_IFMT) == S_IFREG) {
- break;
- }
- }
- if (dirp->name == NULL)
- return (ENOTFOUND);
- if (mode == RRQ && !(stbuf.st_mode & S_IROTH))
- return (EACCESS);
- if (mode == WRQ && !(stbuf.st_mode & S_IWOTH))
- return (EACCESS);
- filename = pathname;
- *filep = filename;
- } else {
- /*
- * If there's no directory list, take our cue from the
- * absolute file request check above (*filename == '/'),
- * and allow access to anything.
- */
- if (stat(filename, &stbuf) < 0)
- return (errno == ENOENT ? ENOTFOUND : EACCESS);
- if (!S_ISREG(stbuf.st_mode))
- return (ENOTFOUND);
- if (mode == RRQ) {
- if ((stbuf.st_mode & S_IROTH) == 0)
- return (EACCESS);
- } else {
- if ((stbuf.st_mode & S_IWOTH) == 0)
- return (EACCESS);
- }
- *filep = filename;
- }
- }
-
- if (tftp_opt_tsize && mode == RRQ)
- tftp_tsize = (unsigned long) stbuf.st_size;
-
- fd = open(filename, mode == RRQ ? O_RDONLY : O_WRONLY | O_TRUNC);
- if (fd < 0)
- return (errno + 100);
- file = fdopen(fd, (mode == RRQ)? "r":"w");
- if (file == NULL) {
- close(fd);
- return (errno + 100);
- }
- return (0);
-}
-
-int timeout;
-jmp_buf timeoutbuf;
-
-void
-timer(int dummy)
-{
-
- timeout += rexmtval;
- if (timeout >= maxtimeout)
- exit(1);
- longjmp(timeoutbuf, 1);
-}
-
-static const char *
-opcode(int code)
-{
- static char buf[64];
-
- switch (code) {
- case RRQ:
- return "RRQ";
- case WRQ:
- return "WRQ";
- case DATA:
- return "DATA";
- case ACK:
- return "ACK";
- case ERROR:
- return "ERROR";
- case OACK:
- return "OACK";
- default:
- (void)snprintf(buf, sizeof(buf), "*code %d*", code);
- return buf;
- }
-}
-
-/*
- * Send the requested file.
- */
-void
-sendfile(struct formats *pf, int etftp, int acklength)
-{
- volatile unsigned int block;
- struct tftphdr *dp;
- struct tftphdr *ap; /* ack packet */
- int size, n;
-
- signal(SIGALRM, timer);
- ap = (struct tftphdr *)ackbuf;
- if (etftp) {
- dp = (struct tftphdr *)oackbuf;
- size = acklength - 4;
- block = 0;
- } else {
- dp = r_init();
- size = 0;
- block = 1;
- }
-
- do {
- if (block > 0) {
- size = readit(file, &dp, tftp_blksize, pf->f_convert);
- if (size < 0) {
- nak(errno + 100);
- goto abort;
- }
- dp->th_opcode = htons((u_short)DATA);
- dp->th_block = htons((u_short)block);
- }
- timeout = 0;
- (void)setjmp(timeoutbuf);
-
-send_data:
- if (!etftp && debug)
- syslog(LOG_DEBUG, "Send DATA %u", block);
- if ((n = send(peer, dp, size + 4, 0)) != size + 4) {
- syslog(LOG_ERR, "tftpd: write: %m");
- goto abort;
- }
- if (block)
- read_ahead(file, tftp_blksize, pf->f_convert);
- for ( ; ; ) {
- alarm(rexmtval); /* read the ack */
- n = recv(peer, ackbuf, tftp_blksize, 0);
- alarm(0);
- if (n < 0) {
- syslog(LOG_ERR, "tftpd: read: %m");
- goto abort;
- }
- ap->th_opcode = ntohs((u_short)ap->th_opcode);
- ap->th_block = ntohs((u_short)ap->th_block);
- switch (ap->th_opcode) {
- case ERROR:
- goto abort;
-
- case ACK:
- if (ap->th_block == 0) {
- etftp = 0;
- acklength = 0;
- dp = r_init();
- goto done;
- }
- if (ap->th_block == block)
- goto done;
- if (debug)
- syslog(LOG_DEBUG, "Resync ACK %u != %u",
- (unsigned int)ap->th_block, block);
- /* Re-synchronize with the other side */
- (void) synchnet(peer, tftp_blksize);
- if (ap->th_block == (block -1))
- goto send_data;
- default:
- syslog(LOG_INFO, "Received %s in sendfile\n",
- opcode(dp->th_opcode));
- }
-
- }
-done:
- if (debug)
- syslog(LOG_DEBUG, "Received ACK for block %u", block);
- block++;
- } while (size == tftp_blksize || block == 1);
-abort:
- (void) fclose(file);
-}
-
-void
-justquit(int dummy)
-{
-
- exit(0);
-}
-
-/*
- * Receive a file.
- */
-void
-recvfile(struct formats *pf, int etftp, int acklength)
-{
- volatile unsigned int block;
- struct tftphdr *dp;
- struct tftphdr *ap; /* ack buffer */
- int n, size;
-
- signal(SIGALRM, timer);
- dp = w_init();
- ap = (struct tftphdr *)oackbuf;
- block = 0;
- do {
- timeout = 0;
- if (etftp == 0) {
- ap = (struct tftphdr *)ackbuf;
- ap->th_opcode = htons((u_short)ACK);
- ap->th_block = htons((u_short)block);
- acklength = 4;
- }
- if (debug)
- syslog(LOG_DEBUG, "Sending ACK for block %u\n", block);
- block++;
- (void) setjmp(timeoutbuf);
-send_ack:
- if (send(peer, ap, acklength, 0) != acklength) {
- syslog(LOG_ERR, "tftpd: write: %m");
- goto abort;
- }
- write_behind(file, pf->f_convert);
- for ( ; ; ) {
- alarm(rexmtval);
- n = recv(peer, dp, tftp_blksize + 4, 0);
- alarm(0);
- if (n < 0) { /* really? */
- syslog(LOG_ERR, "tftpd: read: %m");
- goto abort;
- }
- etftp = 0;
- dp->th_opcode = ntohs((u_short)dp->th_opcode);
- dp->th_block = ntohs((u_short)dp->th_block);
- if (debug)
- syslog(LOG_DEBUG, "Received %s for block %u",
- opcode(dp->th_opcode),
- (unsigned int)dp->th_block);
-
- switch (dp->th_opcode) {
- case ERROR:
- goto abort;
- case DATA:
- if (dp->th_block == block)
- goto done; /* normal */
- if (debug)
- syslog(LOG_DEBUG, "Resync %u != %u",
- (unsigned int)dp->th_block, block);
- /* Re-synchronize with the other side */
- (void) synchnet(peer, tftp_blksize);
- if (dp->th_block == (block-1))
- goto send_ack; /* rexmit */
- break;
- default:
- syslog(LOG_INFO, "Received %s in recvfile\n",
- opcode(dp->th_opcode));
- break;
- }
- }
-done:
- if (debug)
- syslog(LOG_DEBUG, "Got block %u", block);
- /* size = write(file, dp->th_data, n - 4); */
- size = writeit(file, &dp, n - 4, pf->f_convert);
- if (size != (n-4)) { /* ahem */
- if (size < 0) nak(errno + 100);
- else nak(ENOSPACE);
- goto abort;
- }
- } while (size == tftp_blksize);
- write_behind(file, pf->f_convert);
- (void) fclose(file); /* close data file */
-
- ap->th_opcode = htons((u_short)ACK); /* send the "final" ack */
- ap->th_block = htons((u_short)(block));
- if (debug)
- syslog(LOG_DEBUG, "Send final ACK %u", block);
- (void) send(peer, ackbuf, 4, 0);
-
- signal(SIGALRM, justquit); /* just quit on timeout */
- alarm(rexmtval);
- n = recv(peer, buf, sizeof (buf), 0); /* normally times out and quits */
- alarm(0);
- if (n >= 4 && /* if read some data */
- dp->th_opcode == DATA && /* and got a data block */
- block == dp->th_block) { /* then my last ack was lost */
- (void) send(peer, ackbuf, 4, 0); /* resend final ack */
- }
-abort:
- return;
-}
-
-const struct errmsg {
- int e_code;
- const char *e_msg;
-} errmsgs[] = {
- { EUNDEF, "Undefined error code" },
- { ENOTFOUND, "File not found" },
- { EACCESS, "Access violation" },
- { ENOSPACE, "Disk full or allocation exceeded" },
- { EBADOP, "Illegal TFTP operation" },
- { EBADID, "Unknown transfer ID" },
- { EEXISTS, "File already exists" },
- { ENOUSER, "No such user" },
- { EOPTNEG, "Option negotiation failed" },
- { -1, 0 }
-};
-
-static const char *
-errtomsg(int error)
-{
- static char ebuf[20];
- const struct errmsg *pe;
-
- if (error == 0)
- return ("success");
- for (pe = errmsgs; pe->e_code >= 0; pe++)
- if (pe->e_code == error)
- return (pe->e_msg);
- snprintf(ebuf, sizeof(ebuf), "error %d", error);
- return (ebuf);
-}
-
-/*
- * Send a nak packet (error message).
- * Error code passed in is one of the
- * standard TFTP codes, or a UNIX errno
- * offset by 100.
- */
-static void
-nak(int error)
-{
- const struct errmsg *pe;
- struct tftphdr *tp;
- int length;
- size_t msglen;
-
- tp = (struct tftphdr *)buf;
- tp->th_opcode = htons((u_short)ERROR);
- msglen = sizeof(buf) - (&tp->th_msg[0] - buf);
- for (pe = errmsgs; pe->e_code >= 0; pe++)
- if (pe->e_code == error)
- break;
- if (pe->e_code < 0) {
- tp->th_code = EUNDEF; /* set 'undef' errorcode */
- strlcpy(tp->th_msg, strerror(error - 100), msglen);
- } else {
- tp->th_code = htons((u_short)error);
- strlcpy(tp->th_msg, pe->e_msg, msglen);
- }
- if (debug)
- syslog(LOG_DEBUG, "Send NACK %s", tp->th_msg);
- length = strlen(tp->th_msg);
- msglen = &tp->th_msg[length + 1] - buf;
- if (send(peer, buf, msglen, 0) != msglen)
- syslog(LOG_ERR, "nak: %m");
-}
-
-static char *
-verifyhost(struct sockaddr *fromp)
-{
- static char hbuf[MAXHOSTNAMELEN];
-
- if (getnameinfo(fromp, fromp->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0))
- strlcpy(hbuf, "?", sizeof(hbuf));
- return (hbuf);
-}
projects / apple / network_cmds.git / blobdiff