--- /dev/null
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#ifndef lint
+static const char copyright[] =
+"@(#) Copyright (c) 1983, 1993\n\
+ The Regents of the University of California. All rights reserved.\n";
+#endif /* not lint */
+
+/* Mac OS X kernel core dump server, based on the BSD trivial file
+ * transfer protocol server (FreeBSD distribution), with several
+ * modifications. This server is *not* compatible with tftp, as the
+ * protocol has changed considerably.
+ */
+
+/*
+ * Based on the trivial file transfer protocol server.
+ *
+ * The original version included 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 <sys/types.h>
+
+#include <netinet/in.h>
+#include "kdump.h"
+#include <arpa/inet.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.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 <unistd.h>
+
+#include "kdumpsubs.h"
+
+#define TIMEOUT 5
+
+int peer;
+int rexmtval = TIMEOUT;
+int maxtimeout = 10*TIMEOUT;
+
+#define PKTSIZE SEGSIZE+6
+char buf[PKTSIZE];
+char ackbuf[PKTSIZE];
+struct sockaddr_in from;
+int fromlen;
+
+void kdump __P((struct kdumphdr *, int));
+
+/*
+ * 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 = 1;
+static int ipchroot;
+
+static char *errtomsg __P((int));
+static void nak __P((int));
+static char * __P(verifyhost(struct sockaddr_in *));
+
+int
+main(argc, argv)
+ int argc;
+ char *argv[];
+{
+ register struct kdumphdr *tp;
+ register int n;
+ int ch, on;
+ struct sockaddr_in sin;
+ char *chroot_dir = NULL;
+ struct passwd *nobody;
+ char *chuser = "nobody";
+
+ openlog("kdumpd", LOG_PID | LOG_NDELAY, LOG_FTP);
+ while ((ch = getopt(argc, argv, "cClns:u:")) != -1) {
+ switch (ch) {
+ case 'c':
+ ipchroot = 1;
+ break;
+ case 'C':
+ ipchroot = 2;
+ break;
+ case 'l':
+ logging = 1;
+ break;
+ case 'n':
+ suppress_naks = 1;
+ break;
+ case 's':
+ chroot_dir = optarg;
+ break;
+ case 'u':
+ chuser = optarg;
+ break;
+ default:
+ syslog(LOG_WARNING, "ignoring unknown option -%c", ch);
+ }
+ }
+
+ 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++;
+ }
+ }
+ }
+ else if (chroot_dir) {
+ dirs->name = "/";
+ dirs->len = 1;
+ }
+ if (ipchroot && chroot_dir == NULL) {
+ syslog(LOG_ERR, "-c requires -s");
+ exit(1);
+ }
+
+ on = 1;
+ if (ioctl(0, FIONBIO, &on) < 0) {
+ syslog(LOG_ERR, "ioctl(FIONBIO): %m");
+ exit(1);
+ }
+ fromlen = sizeof (from);
+ n = recvfrom(0, 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 kdump port, and the next request
+ * to come in will start up a new instance of kdumpd.
+ *
+ * We do this so that inetd can run kdumpd in "wait" mode.
+ * The problem with kdumpd running in "nowait" mode is that
+ * inetd may get one or more successful "selects" on the
+ * kdump port before we do our receive, so more than one
+ * instance of kdumpd may be started up. Worse, if kdumpd
+ * breaks 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 requests, 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 kdumpd being started up to service
+ * a single request from a single client.
+ */
+ j = sizeof from;
+ i = recvfrom(0, 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);
+ }
+ }
+
+ /*
+ * Since we exit here, we should do that only after the above
+ * recvfrom to keep inetd from constantly forking should there
+ * be a problem. See the above comment about system clogging.
+ */
+ if (chroot_dir) {
+ if (ipchroot) {
+ char tempchroot[MAXPATHLEN];
+ char *tempaddr;
+ struct stat sb;
+ int statret;
+
+ tempaddr = inet_ntoa(from.sin_addr);
+ snprintf(tempchroot, sizeof(tempchroot), "%s/%s", chroot_dir, tempaddr);
+ statret = stat(tempchroot, &sb);
+ if ((sb.st_mode & S_IFDIR) &&
+ (statret == 0 || (statret == -1 && ipchroot == 1)))
+ chroot_dir = tempchroot;
+ }
+ /* Must get this before chroot because /etc might go away */
+ if ((nobody = getpwnam(chuser)) == NULL) {
+ syslog(LOG_ERR, "%s: no such user", chuser);
+ exit(1);
+ }
+ if (chroot(chroot_dir)) {
+ syslog(LOG_ERR, "chroot: %s: %m", chroot_dir);
+ exit(1);
+ }
+ chdir( "/" );
+ setuid(nobody->pw_uid);
+ }
+ else
+ if (0 != chdir(dirs->name))
+ syslog(LOG_ERR, "chdir%s: %m", dirs->name);
+
+ from.sin_family = AF_INET;
+ alarm(0);
+ close(0);
+ close(1);
+ peer = socket(AF_INET, SOCK_DGRAM, 0);
+ if (peer < 0) {
+ syslog(LOG_ERR, "socket: %m");
+ exit(1);
+ }
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+ if (bind(peer, (struct sockaddr *)&sin, sizeof (sin)) < 0) {
+ syslog(LOG_ERR, "bind: %m");
+ exit(1);
+ }
+ if (connect(peer, (struct sockaddr *)&from, sizeof(from)) < 0) {
+ syslog(LOG_ERR, "connect: %m");
+ exit(1);
+ }
+ tp = (struct kdumphdr *)buf;
+ tp->th_opcode = ntohs(tp->th_opcode);
+ if (tp->th_opcode == WRQ)
+ kdump(tp, n);
+ exit(1);
+}
+
+struct formats;
+int validate_access __P((char **, int));
+
+void recvfile __P((struct formats *));
+
+struct formats {
+ char *f_mode;
+ int (*f_validate) __P((char **, int));
+
+ void (*f_recv) __P((struct formats *));
+ int f_convert;
+} formats[] = {
+ { "netascii", validate_access, recvfile, 1 },
+ { "octet", validate_access, recvfile, 0 },
+ { 0 }
+};
+
+/*
+ * Handle initial connection protocol.
+ */
+void
+kdump(tp, size)
+ struct kdumphdr *tp;
+ int size;
+{
+ register char *cp;
+ int first = 1, ecode;
+ register struct formats *pf;
+ char *filename, *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);
+ }
+ ecode = (*pf->f_validate)(&filename, tp->th_opcode);
+ if (logging) {
+ syslog(LOG_INFO, "%s: %s request for %s: %s", verifyhost(&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 (tp->th_opcode == WRQ)
+ (*pf->f_recv)(pf);
+
+ exit(0);
+}
+
+
+FILE *file;
+
+/*
+ * Validate file access. We only allow storage of files that do not already
+ * exist, and that do not include directory specifiers in their pathnames.
+ * This is because kernel coredump filenames should always be of the form
+ * "core-version-IP as dotted quad-random string" as in :
+ * core-custom-17.202.40.204-a75b4eec
+ * The file is written to the directory supplied as the first argument
+ * in inetd.conf
+ */
+
+int
+validate_access(char **filep, int mode)
+{
+ struct stat stbuf;
+ int fd;
+ char *filename = *filep;
+ static char pathname[MAXPATHLEN];
+
+ if (strstr(filename, "/") || strstr(filename, ".."))
+ return (EACCESS);
+
+ snprintf(pathname, sizeof(pathname), "./%s", filename);
+
+ if (0 == stat(pathname, &stbuf))
+ return (EEXIST);
+
+ if (errno != ENOENT)
+ return (errno);
+
+
+ fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC);
+
+ if (fd < 0)
+ return (errno + 100);
+
+ file = fdopen(fd, (mode == RRQ)? "r":"w");
+ if (file == NULL) {
+ return errno+100;
+ }
+ if (fchmod(fd, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) < 0)
+ return errno+100;
+
+ return (0);
+}
+
+int timeout;
+jmp_buf timeoutbuf;
+
+void
+timer()
+{
+
+ timeout += rexmtval;
+ if (timeout >= maxtimeout)
+ {
+ longjmp(timeoutbuf, 2);
+ }
+ longjmp(timeoutbuf, 1);
+}
+
+void
+justquit()
+{
+ exit(0);
+}
+
+
+/*
+ * Receive a file.
+ */
+void
+recvfile(pf)
+ struct formats *pf;
+{
+ struct kdumphdr *dp, *w_init();
+ register struct kdumphdr *ap; /* ack buffer */
+ register int n, size;
+ volatile unsigned int block;
+ volatile unsigned int jmpval = 0;
+
+ signal(SIGALRM, timer);
+ dp = w_init();
+ ap = (struct kdumphdr *)ackbuf;
+ block = 0;
+ do {
+send_seek_ack: timeout = 0;
+ ap->th_opcode = htons((u_short)ACK);
+ ap->th_block = htonl((unsigned int)block);
+ block++;
+ jmpval = setjmp(timeoutbuf);
+ if (2 == jmpval)
+ {
+ syslog (LOG_ERR, "Timing out and flushing file to disk");
+ goto flushfile;
+ }
+send_ack:
+ if (send(peer, ackbuf, 6 , 0) != 6) {
+ syslog(LOG_ERR, "write: %m");
+ goto abort;
+ }
+ write_behind(file, pf->f_convert);
+ for ( ; ; ) {
+ alarm(rexmtval);
+ n = recv(peer, dp, PKTSIZE, 0);
+ alarm(0);
+ if (n < 0) { /* really? */
+ syslog(LOG_ERR, "read: %m");
+ goto abort;
+ }
+ dp->th_opcode = ntohs((u_short)dp->th_opcode);
+ dp->th_block = ntohl((unsigned int)dp->th_block);
+ if (dp->th_opcode == ERROR)
+ goto abort;
+ if (dp->th_opcode == KDP_EOF)
+ {
+ syslog (LOG_ERR, "Received last panic dump packet");
+ goto final_ack;
+ }
+ if (dp->th_opcode == KDP_SEEK)
+ {
+ if (dp->th_block == block)
+ {
+ unsigned int tempoff = 0;
+ bcopy (dp->th_data, &tempoff, sizeof(unsigned int));
+ lseek (fileno (file), ntohl(tempoff), SEEK_SET);
+ if (errno)
+ syslog (LOG_ERR, "lseek: %m");
+
+ goto send_seek_ack;
+ }
+ (void) synchnet(peer);
+ if (dp->th_block == (block-1))
+ {
+ syslog (LOG_DAEMON|LOG_ERR, "Retransmitting seek ack - current block %hu, received block %hu", block, dp->th_block);
+ goto send_ack; /* rexmit */
+ }
+ }
+
+ if (dp->th_opcode == DATA) {
+ if (dp->th_block == block) {
+ break; /* normal */
+ }
+ /* Re-synchronize with the other side */
+ (void) synchnet(peer);
+ if (dp->th_block == (block-1))
+ {
+ syslog (LOG_DAEMON|LOG_ERR, "Retransmitting ack - current block %hu, received block %hu", block, dp->th_block);
+ goto send_ack; /* rexmit */
+ }
+ else
+ syslog (LOG_DAEMON|LOG_ERR, "Not retransmitting ack - current block %hu, received block %hu", block, dp->th_block);
+ }
+ }
+
+ size = writeit(file, &dp, n - 6, pf->f_convert);
+ if (size != (n-6)) { /* ahem */
+ if (size < 0) nak(errno + 100);
+ else nak(ENOSPACE);
+ goto abort;
+ }
+ } while (dp->th_opcode != KDP_EOF);
+
+final_ack:
+ ap->th_opcode = htons((u_short)ACK); /* send the "final" ack */
+ ap->th_block = htonl((unsigned int) (block));
+ (void) send(peer, ackbuf, 6, 0);
+flushfile:
+ write_behind(file, pf->f_convert);
+ (void) fclose(file); /* close data file */
+ syslog (LOG_ERR, "file closed, sending final ACK\n");
+
+ 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 >= 6 && /* 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, 6, 0); /* resend final ack */
+ }
+abort:
+ return;
+}
+
+struct errmsg {
+ int e_code;
+ char *e_msg;
+} errmsgs[] = {
+ { EUNDEF, "Undefined error code" },
+ { ENOTFOUND, "File not found" },
+ { EACCESS, "Access violation" },
+ { ENOSPACE, "Disk full or allocation exceeded" },
+ { EBADOP, "Illegal KDUMP operation" },
+ { EBADID, "Unknown transfer ID" },
+ { EEXISTS, "File already exists" },
+ { ENOUSER, "No such user" },
+ { -1, 0 }
+};
+
+static char *
+errtomsg(error)
+ int error;
+{
+ static char buf[20];
+ register 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(buf, sizeof(buf), "error %d", error);
+ return buf;
+}
+
+/*
+ * Send a nak packet (error message).
+ * Error code passed in is one of the
+ * standard KDUMP codes, or a UNIX errno
+ * offset by 100.
+ */
+static void
+nak(error)
+ int error;
+{
+ register struct kdumphdr *tp;
+ int length;
+ register struct errmsg *pe;
+
+ tp = (struct kdumphdr *)buf;
+ tp->th_opcode = htons((u_short)ERROR);
+ tp->th_code = htons((unsigned int)error);
+ for (pe = errmsgs; pe->e_code >= 0; pe++)
+ if (pe->e_code == error)
+ break;
+ if (pe->e_code < 0) {
+ pe->e_msg = strerror(error - 100);
+ tp->th_code = EUNDEF; /* set 'undef' errorcode */
+ }
+ strcpy(tp->th_msg, pe->e_msg);
+ length = strlen(pe->e_msg);
+ tp->th_msg[length] = '\0';
+ length += 5;
+ if (send(peer, buf, length, 0) != length)
+ syslog(LOG_ERR, "nak: %m");
+}
+
+static char *
+verifyhost(fromp)
+ struct sockaddr_in *fromp;
+{
+ struct hostent *hp;
+
+ hp = gethostbyaddr((char *)&fromp->sin_addr, sizeof(fromp->sin_addr),
+ fromp->sin_family);
+ if(hp)
+ return hp->h_name;
+ else
+ return inet_ntoa(fromp->sin_addr);
+}
projects / apple / network_cmds.git / blobdiff