diff options
Diffstat (limited to 'usr.sbin/bootpd/bootpd.c')
| -rw-r--r-- | usr.sbin/bootpd/bootpd.c | 1380 |
1 files changed, 0 insertions, 1380 deletions
diff --git a/usr.sbin/bootpd/bootpd.c b/usr.sbin/bootpd/bootpd.c deleted file mode 100644 index fc7a5dd..0000000 --- a/usr.sbin/bootpd/bootpd.c +++ /dev/null @@ -1,1380 +0,0 @@ -/************************************************************************ - Copyright 1988, 1991 by Carnegie Mellon University - - All Rights Reserved - -Permission to use, copy, modify, and distribute this software and its -documentation for any purpose and without fee is hereby granted, provided -that the above copyright notice appear in all copies and that both that -copyright notice and this permission notice appear in supporting -documentation, and that the name of Carnegie Mellon University not be used -in advertising or publicity pertaining to distribution of the software -without specific, written prior permission. - -CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS -SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. -IN NO EVENT SHALL CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL -DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR -PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS -ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS -SOFTWARE. -************************************************************************/ - -#ifndef lint -static char rcsid[] = "$Id: bootpd.c,v 1.4 1994/08/24 18:14:44 gwr Exp $"; -#endif - -/* - * BOOTP (bootstrap protocol) server daemon. - * - * Answers BOOTP request packets from booting client machines. - * See [SRI-NIC]<RFC>RFC951.TXT for a description of the protocol. - * See [SRI-NIC]<RFC>RFC1048.TXT for vendor-information extensions. - * See RFC 1395 for option tags 14-17. - * See accompanying man page -- bootpd.8 - * - * HISTORY - * See ./Changes - * - * BUGS - * See ./ToDo - */ - - - -#include <sys/types.h> -#include <sys/param.h> -#include <sys/socket.h> -#include <sys/ioctl.h> -#include <sys/file.h> -#include <sys/time.h> -#include <sys/stat.h> - -#include <net/if.h> -#include <netinet/in.h> -#include <arpa/inet.h> /* inet_ntoa */ - -#ifndef NO_UNISTD -#include <unistd.h> -#endif -#include <stdlib.h> -#include <signal.h> -#include <stdio.h> -#include <string.h> -#include <errno.h> -#include <ctype.h> -#include <netdb.h> -#include <syslog.h> -#include <assert.h> - -#ifdef NO_SETSID -# include <fcntl.h> /* for O_RDONLY, etc */ -#endif - -#ifdef SVR4 -/* Using sigset() avoids the need to re-arm each time. */ -#define signal sigset -#endif - -#ifndef USE_BFUNCS -# include <memory.h> -/* Yes, memcpy is OK here (no overlapped copies). */ -# define bcopy(a,b,c) memcpy(b,a,c) -# define bzero(p,l) memset(p,0,l) -# define bcmp(a,b,c) memcmp(a,b,c) -#endif - -#include "bootp.h" -#include "hash.h" -#include "hwaddr.h" -#include "bootpd.h" -#include "dovend.h" -#include "getif.h" -#include "readfile.h" -#include "report.h" -#include "tzone.h" -#include "patchlevel.h" - -#ifndef CONFIG_FILE -#define CONFIG_FILE "/etc/bootptab" -#endif -#ifndef DUMPTAB_FILE -#define DUMPTAB_FILE "/tmp/bootpd.dump" -#endif - - - -/* - * Externals, forward declarations, and global variables - */ - -#ifdef __STDC__ -#define P(args) args -#else -#define P(args) () -#endif - -extern void dumptab P((char *)); - -PRIVATE void catcher P((int)); -PRIVATE int chk_access P((char *, int32 *)); -#ifdef VEND_CMU -PRIVATE void dovend_cmu P((struct bootp *, struct host *)); -#endif -PRIVATE void dovend_rfc1048 P((struct bootp *, struct host *, int32)); -PRIVATE void handle_reply P((void)); -PRIVATE void handle_request P((void)); -PRIVATE void sendreply P((int forward, int32 dest_override)); -PRIVATE void usage P((void)); - -#undef P - -/* - * IP port numbers for client and server obtained from /etc/services - */ - -u_short bootps_port, bootpc_port; - - -/* - * Internet socket and interface config structures - */ - -struct sockaddr_in bind_addr; /* Listening */ -struct sockaddr_in recv_addr; /* Packet source */ -struct sockaddr_in send_addr; /* destination */ - - -/* - * option defaults - */ -int debug = 0; /* Debugging flag (level) */ -struct timeval actualtimeout = -{ /* fifteen minutes */ - 15 * 60L, /* tv_sec */ - 0 /* tv_usec */ -}; - -/* - * General - */ - -int s; /* Socket file descriptor */ -char *pktbuf; /* Receive packet buffer */ -int pktlen; -char *progname; -char *chdir_path; -char hostname[MAXHOSTNAMELEN]; /* System host name */ -struct in_addr my_ip_addr; - -/* Flags set by signal catcher. */ -PRIVATE int do_readtab = 0; -PRIVATE int do_dumptab = 0; - -/* - * Globals below are associated with the bootp database file (bootptab). - */ - -char *bootptab = CONFIG_FILE; -char *bootpd_dump = DUMPTAB_FILE; - - - -/* - * Initialization such as command-line processing is done and then the - * main server loop is started. - */ - -void -main(argc, argv) - int argc; - char **argv; -{ - struct timeval *timeout; - struct bootp *bp; - struct servent *servp; - struct hostent *hep; - char *stmp; - int n, ba_len, ra_len; - int nfound, readfds; - int standalone; - - progname = strrchr(argv[0], '/'); - if (progname) progname++; - else progname = argv[0]; - - /* - * Initialize logging. - */ - report_init(0); /* uses progname */ - - /* - * Log startup - */ - report(LOG_INFO, "version %s.%d", VERSION, PATCHLEVEL); - - /* Debugging for compilers with struct padding. */ - assert(sizeof(struct bootp) == BP_MINPKTSZ); - - /* Get space for receiving packets and composing replies. */ - pktbuf = malloc(MAX_MSG_SIZE); - if (!pktbuf) { - report(LOG_ERR, "malloc failed"); - exit(1); - } - bp = (struct bootp *) pktbuf; - - /* - * Check to see if a socket was passed to us from inetd. - * - * Use getsockname() to determine if descriptor 0 is indeed a socket - * (and thus we are probably a child of inetd) or if it is instead - * something else and we are running standalone. - */ - s = 0; - ba_len = sizeof(bind_addr); - bzero((char *) &bind_addr, ba_len); - errno = 0; - standalone = TRUE; - if (getsockname(s, (struct sockaddr *) &bind_addr, &ba_len) == 0) { - /* - * Descriptor 0 is a socket. Assume we are a child of inetd. - */ - if (bind_addr.sin_family == AF_INET) { - standalone = FALSE; - bootps_port = ntohs(bind_addr.sin_port); - } else { - /* Some other type of socket? */ - report(LOG_ERR, "getsockname: not an INET socket"); - } - } - - /* - * Set defaults that might be changed by option switches. - */ - stmp = NULL; - timeout = &actualtimeout; - - /* - * Read switches. - */ - for (argc--, argv++; argc > 0; argc--, argv++) { - if (argv[0][0] != '-') - break; - switch (argv[0][1]) { - - case 'c': /* chdir_path */ - if (argv[0][2]) { - stmp = &(argv[0][2]); - } else { - argc--; - argv++; - stmp = argv[0]; - } - if (!stmp || (stmp[0] != '/')) { - fprintf(stderr, - "bootpd: invalid chdir specification\n"); - break; - } - chdir_path = stmp; - break; - - case 'd': /* debug level */ - if (argv[0][2]) { - stmp = &(argv[0][2]); - } else if (argv[1] && argv[1][0] == '-') { - /* - * Backwards-compatible behavior: - * no parameter, so just increment the debug flag. - */ - debug++; - break; - } else { - argc--; - argv++; - stmp = argv[0]; - } - if (!stmp || (sscanf(stmp, "%d", &n) != 1) || (n < 0)) { - fprintf(stderr, - "%s: invalid debug level\n", progname); - break; - } - debug = n; - break; - - case 'h': /* override hostname */ - if (argv[0][2]) { - stmp = &(argv[0][2]); - } else { - argc--; - argv++; - stmp = argv[0]; - } - if (!stmp) { - fprintf(stderr, - "bootpd: missing hostname\n"); - break; - } - strncpy(hostname, stmp, sizeof(hostname)-1); - break; - - case 'i': /* inetd mode */ - standalone = FALSE; - break; - - case 's': /* standalone mode */ - standalone = TRUE; - break; - - case 't': /* timeout */ - if (argv[0][2]) { - stmp = &(argv[0][2]); - } else { - argc--; - argv++; - stmp = argv[0]; - } - if (!stmp || (sscanf(stmp, "%d", &n) != 1) || (n < 0)) { - fprintf(stderr, - "%s: invalid timeout specification\n", progname); - break; - } - actualtimeout.tv_sec = (int32) (60 * n); - /* - * If the actual timeout is zero, pass a NULL pointer - * to select so it blocks indefinitely, otherwise, - * point to the actual timeout value. - */ - timeout = (n > 0) ? &actualtimeout : NULL; - break; - - default: - fprintf(stderr, "%s: unknown switch: -%c\n", - progname, argv[0][1]); - usage(); - break; - - } /* switch */ - } /* for args */ - - /* - * Override default file names if specified on the command line. - */ - if (argc > 0) - bootptab = argv[0]; - - if (argc > 1) - bootpd_dump = argv[1]; - - /* - * Get my hostname and IP address. - */ - if (hostname[0] == '\0') { - if (gethostname(hostname, sizeof(hostname)) == -1) { - fprintf(stderr, "bootpd: can't get hostname\n"); - exit(1); - } - } - hep = gethostbyname(hostname); - if (!hep) { - fprintf(stderr, "Can not get my IP address\n"); - exit(1); - } - bcopy(hep->h_addr, (char *)&my_ip_addr, sizeof(my_ip_addr)); - - if (standalone) { - /* - * Go into background and disassociate from controlling terminal. - */ - if (debug < 3) { - if (fork()) - exit(0); -#ifdef NO_SETSID - setpgrp(0,0); -#ifdef TIOCNOTTY - n = open("/dev/tty", O_RDWR); - if (n >= 0) { - ioctl(n, TIOCNOTTY, (char *) 0); - (void) close(n); - } -#endif /* TIOCNOTTY */ -#else /* SETSID */ - if (setsid() < 0) - perror("setsid"); -#endif /* SETSID */ - } /* if debug < 3 */ - - /* - * Nuke any timeout value - */ - timeout = NULL; - - } /* if standalone (1st) */ - - /* Set the cwd (i.e. to /tftpboot) */ - if (chdir_path) { - if (chdir(chdir_path) < 0) - report(LOG_ERR, "%s: chdir failed", chdir_path); - } - - /* Get the timezone. */ - tzone_init(); - - /* Allocate hash tables. */ - rdtab_init(); - - /* - * Read the bootptab file. - */ - readtab(1); /* force read */ - - if (standalone) { - - /* - * Create a socket. - */ - if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { - report(LOG_ERR, "socket: %s", get_network_errmsg()); - exit(1); - } - - /* - * Get server's listening port number - */ - servp = getservbyname("bootps", "udp"); - if (servp) { - bootps_port = ntohs((u_short) servp->s_port); - } else { - bootps_port = (u_short) IPPORT_BOOTPS; - report(LOG_ERR, - "udp/bootps: unknown service -- assuming port %d", - bootps_port); - } - - /* - * Bind socket to BOOTPS port. - */ - bind_addr.sin_family = AF_INET; - bind_addr.sin_addr.s_addr = INADDR_ANY; - bind_addr.sin_port = htons(bootps_port); - if (bind(s, (struct sockaddr *) &bind_addr, - sizeof(bind_addr)) < 0) - { - report(LOG_ERR, "bind: %s", get_network_errmsg()); - exit(1); - } - } /* if standalone (2nd)*/ - - /* - * Get destination port number so we can reply to client - */ - servp = getservbyname("bootpc", "udp"); - if (servp) { - bootpc_port = ntohs(servp->s_port); - } else { - report(LOG_ERR, - "udp/bootpc: unknown service -- assuming port %d", - IPPORT_BOOTPC); - bootpc_port = (u_short) IPPORT_BOOTPC; - } - - /* - * Set up signals to read or dump the table. - */ - if ((int) signal(SIGHUP, catcher) < 0) { - report(LOG_ERR, "signal: %s", get_errmsg()); - exit(1); - } - if ((int) signal(SIGUSR1, catcher) < 0) { - report(LOG_ERR, "signal: %s", get_errmsg()); - exit(1); - } - - /* - * Process incoming requests. - */ - for (;;) { - readfds = 1 << s; - nfound = select(s + 1, (fd_set *)&readfds, NULL, NULL, timeout); - if (nfound < 0) { - if (errno != EINTR) { - report(LOG_ERR, "select: %s", get_errmsg()); - } - /* - * Call readtab() or dumptab() here to avoid the - * dangers of doing I/O from a signal handler. - */ - if (do_readtab) { - do_readtab = 0; - readtab(1); /* force read */ - } - if (do_dumptab) { - do_dumptab = 0; - dumptab(bootpd_dump); - } - continue; - } - if (!(readfds & (1 << s))) { - if (debug > 1) - report(LOG_INFO, "exiting after %ld minutes of inactivity", - actualtimeout.tv_sec / 60); - exit(0); - } - ra_len = sizeof(recv_addr); - n = recvfrom(s, pktbuf, MAX_MSG_SIZE, 0, - (struct sockaddr *) &recv_addr, &ra_len); - if (n <= 0) { - continue; - } - if (debug > 1) { - report(LOG_INFO, "recvd pkt from IP addr %s", - inet_ntoa(recv_addr.sin_addr)); - } - if (n < sizeof(struct bootp)) { - if (debug) { - report(LOG_INFO, "received short packet"); - } - continue; - } - pktlen = n; - - readtab(0); /* maybe re-read bootptab */ - - switch (bp->bp_op) { - case BOOTREQUEST: - handle_request(); - break; - case BOOTREPLY: - handle_reply(); - break; - } - } -} - - - - -/* - * Print "usage" message and exit - */ - -PRIVATE void -usage() -{ - fprintf(stderr, - "usage: bootpd [-d level] [-i] [-s] [-t timeout] [configfile [dumpfile]]\n"); - fprintf(stderr, "\t -c n\tset current directory\n"); - fprintf(stderr, "\t -d n\tset debug level\n"); - fprintf(stderr, "\t -i\tforce inetd mode (run as child of inetd)\n"); - fprintf(stderr, "\t -s\tforce standalone mode (run without inetd)\n"); - fprintf(stderr, "\t -t n\tset inetd exit timeout to n minutes\n"); - exit(1); -} - -/* Signal catchers */ -PRIVATE void -catcher(sig) - int sig; -{ - if (sig == SIGHUP) - do_readtab = 1; - if (sig == SIGUSR1) - do_dumptab = 1; -#ifdef SYSV - /* For older "System V" derivatives with no sigset(). */ - /* XXX - Should just do it the POSIX way (sigaction). */ - signal(sig, catcher); -#endif -} - - - -/* - * Process BOOTREQUEST packet. - * - * Note: This version of the bootpd.c server never forwards - * a request to another server. That is the job of a gateway - * program such as the "bootpgw" program included here. - * - * (Also this version does not interpret the hostname field of - * the request packet; it COULD do a name->address lookup and - * forward the request there.) - */ -PRIVATE void -handle_request() -{ - struct bootp *bp = (struct bootp *) pktbuf; - struct host *hp = NULL; - struct host dummyhost; - int32 bootsize = 0; - unsigned hlen, hashcode; - int32 dest; - char realpath[1024]; - char *clntpath; - char *homedir, *bootfile; - int n; - - /* XXX - SLIP init: Set bp_ciaddr = recv_addr here? */ - - /* - * If the servername field is set, compare it against us. - * If we're not being addressed, ignore this request. - * If the server name field is null, throw in our name. - */ - if (strlen(bp->bp_sname)) { - if (strcmp(bp->bp_sname, hostname)) { - if (debug) - report(LOG_INFO, "\ -ignoring request for server %s from client at %s address %s", - bp->bp_sname, netname(bp->bp_htype), - haddrtoa(bp->bp_chaddr, bp->bp_hlen)); - /* XXX - Is it correct to ignore such a request? -gwr */ - return; - } - } else { - strcpy(bp->bp_sname, hostname); - } - - /* Convert the request into a reply. */ - bp->bp_op = BOOTREPLY; - if (bp->bp_ciaddr.s_addr == 0) { - /* - * client doesnt know his IP address, - * search by hardware address. - */ - if (debug > 1) { - report(LOG_INFO, "request from %s address %s", - netname(bp->bp_htype), - haddrtoa(bp->bp_chaddr, bp->bp_hlen)); - } - hlen = haddrlength(bp->bp_htype); - if (hlen != bp->bp_hlen) { - report(LOG_NOTICE, "bad addr len from from %s address %s", - netname(bp->bp_htype), - haddrtoa(bp->bp_chaddr, hlen)); - } - dummyhost.htype = bp->bp_htype; - bcopy(bp->bp_chaddr, dummyhost.haddr, hlen); - hashcode = hash_HashFunction(bp->bp_chaddr, hlen); - hp = (struct host *) hash_Lookup(hwhashtable, hashcode, hwlookcmp, - &dummyhost); - if (hp == NULL && - bp->bp_htype == HTYPE_IEEE802) - { - /* Try again with address in "canonical" form. */ - haddr_conv802(bp->bp_chaddr, dummyhost.haddr, hlen); - if (debug > 1) { - report(LOG_INFO, "\ -HW addr type is IEEE 802. convert to %s and check again\n", - haddrtoa(dummyhost.haddr, bp->bp_hlen)); - } - hashcode = hash_HashFunction(dummyhost.haddr, hlen); - hp = (struct host *) hash_Lookup(hwhashtable, hashcode, - hwlookcmp, &dummyhost); - } - if (hp == NULL) { - /* - * XXX - Add dynamic IP address assignment? - */ - if (debug > 1) - report(LOG_INFO, "unknown client %s address %s", - netname(bp->bp_htype), - haddrtoa(bp->bp_chaddr, bp->bp_hlen)); - return; /* not found */ - } - (bp->bp_yiaddr).s_addr = hp->iaddr.s_addr; - - } else { - - /* - * search by IP address. - */ - if (debug > 1) { - report(LOG_INFO, "request from IP addr %s", - inet_ntoa(bp->bp_ciaddr)); - } - dummyhost.iaddr.s_addr = bp->bp_ciaddr.s_addr; - hashcode = hash_HashFunction((u_char *) &(bp->bp_ciaddr.s_addr), 4); - hp = (struct host *) hash_Lookup(iphashtable, hashcode, iplookcmp, - &dummyhost); - if (hp == NULL) { - if (debug > 1) { - report(LOG_NOTICE, "IP address not found: %s", - inet_ntoa(bp->bp_ciaddr)); - } - return; - } - } - - if (debug) { - report(LOG_INFO, "found %s (%s)", inet_ntoa(hp->iaddr), - hp->hostname->string); - } - - /* - * If there is a response delay threshold, ignore requests - * with a timestamp lower than the threshold. - */ - if (hp->flags.min_wait) { - u_int32 t = (u_int32) ntohs(bp->bp_secs); - if (t < hp->min_wait) { - if (debug > 1) - report(LOG_INFO, - "ignoring request due to timestamp (%d < %d)", - t, hp->min_wait); - return; - } - } - -#ifdef YORK_EX_OPTION - /* - * The need for the "ex" tag arose out of the need to empty - * shared networked drives on diskless PCs. This solution is - * not very clean but it does work fairly well. - * Written by Edmund J. Sutcliffe <edmund@york.ac.uk> - * - * XXX - This could compromise security if a non-trusted user - * managed to write an entry in the bootptab with :ex=trojan: - * so I would leave this turned off unless you need it. -gwr - */ - /* Run a program, passing the client name as a parameter. */ - if (hp->flags.exec_file) { - char tst[100]; - /* XXX - Check string lengths? -gwr */ - strcpy (tst, hp->exec_file->string); - strcat (tst, " "); - strcat (tst, hp->hostname->string); - strcat (tst, " &"); - if (debug) - report(LOG_INFO, "executing %s", tst); - system(tst); /* Hope this finishes soon... */ - } -#endif /* YORK_EX_OPTION */ - - /* - * If a specific TFTP server address was specified in the bootptab file, - * fill it in, otherwise zero it. - * XXX - Rather than zero it, should it be the bootpd address? -gwr - */ - (bp->bp_siaddr).s_addr = (hp->flags.bootserver) ? - hp->bootserver.s_addr : 0L; - -#ifdef STANFORD_PROM_COMPAT - /* - * Stanford bootp PROMs (for a Sun?) have no way to leave - * the boot file name field blank (because the boot file - * name is automatically generated from some index). - * As a work-around, this little hack allows those PROMs to - * specify "sunboot14" with the same effect as a NULL name. - * (The user specifies boot device 14 or some such magic.) - */ - if (strcmp(bp->bp_file, "sunboot14") == 0) - bp->bp_file[0] = '\0'; /* treat it as unspecified */ -#endif - - /* - * Fill in the client's proper bootfile. - * - * If the client specifies an absolute path, try that file with a - * ".host" suffix and then without. If the file cannot be found, no - * reply is made at all. - * - * If the client specifies a null or relative file, use the following - * table to determine the appropriate action: - * - * Homedir Bootfile Client's file - * specified? specified? specification Action - * ------------------------------------------------------------------- - * No No Null Send null filename - * No No Relative Discard request - * No Yes Null Send if absolute else null - * No Yes Relative Discard request *XXX - * Yes No Null Send null filename - * Yes No Relative Lookup with ".host" - * Yes Yes Null Send home/boot or bootfile - * Yes Yes Relative Lookup with ".host" *XXX - * - */ - - /* - * XXX - I don't like the policy of ignoring a client when the - * boot file is not accessible. The TFTP server might not be - * running on the same machine as the BOOTP server, in which - * case checking accessibility of the boot file is pointless. - * - * Therefore, file accessibility is now demanded ONLY if you - * define CHECK_FILE_ACCESS in the Makefile options. -gwr - */ - - /* - * The "real" path is as seen by the BOOTP daemon on this - * machine, while the client path is relative to the TFTP - * daemon chroot directory (i.e. /tftpboot). - */ - if (hp->flags.tftpdir) { - strcpy(realpath, hp->tftpdir->string); - clntpath = &realpath[strlen(realpath)]; - } else { - realpath[0] = '\0'; - clntpath = realpath; - } - - /* - * Determine client's requested homedir and bootfile. - */ - homedir = NULL; - bootfile = NULL; - if (bp->bp_file[0]) { - homedir = bp->bp_file; - bootfile = strrchr(homedir, '/'); - if (bootfile) { - if (homedir == bootfile) - homedir = NULL; - *bootfile++ = '\0'; - } else { - /* no "/" in the string */ - bootfile = homedir; - homedir = NULL; - } - if (debug > 2) { - report(LOG_INFO, "requested path=\"%s\" file=\"%s\"", - (homedir) ? homedir : "", - (bootfile) ? bootfile : ""); - } - } - - /* - * Specifications in bootptab override client requested values. - */ - if (hp->flags.homedir) - homedir = hp->homedir->string; - if (hp->flags.bootfile) - bootfile = hp->bootfile->string; - - /* - * Construct bootfile path. - */ - if (homedir) { - if (homedir[0] != '/') - strcat(clntpath, "/"); - strcat(clntpath, homedir); - homedir = NULL; - } - if (bootfile) { - if (bootfile[0] != '/') - strcat(clntpath, "/"); - strcat(clntpath, bootfile); - bootfile = NULL; - } - - /* - * First try to find the file with a ".host" suffix - */ - n = strlen(clntpath); - strcat(clntpath, "."); - strcat(clntpath, hp->hostname->string); - if (chk_access(realpath, &bootsize) < 0) { - clntpath[n] = 0; /* Try it without the suffix */ - if (chk_access(realpath, &bootsize) < 0) { - /* neither "file.host" nor "file" was found */ -#ifdef CHECK_FILE_ACCESS - - if (bp->bp_file[0]) { - /* - * Client wanted specific file - * and we didn't have it. - */ - report(LOG_NOTICE, - "requested file not found: \"%s\"", clntpath); - return; - } - /* - * Client didn't ask for a specific file and we couldn't - * access the default file, so just zero-out the bootfile - * field in the packet and continue processing the reply. - */ - bzero(bp->bp_file, sizeof(bp->bp_file)); - goto null_file_name; - -#else /* CHECK_FILE_ACCESS */ - - /* Complain only if boot file size was needed. */ - if (hp->flags.bootsize_auto) { - report(LOG_ERR, "can not determine size of file \"%s\"", - clntpath); - } - -#endif /* CHECK_FILE_ACCESS */ - } - } - strncpy(bp->bp_file, clntpath, BP_FILE_LEN); - if (debug > 2) - report(LOG_INFO, "bootfile=\"%s\"", clntpath); - -null_file_name: - - - /* - * Handle vendor options based on magic number. - */ - - if (debug > 1) { - report(LOG_INFO, "vendor magic field is %d.%d.%d.%d", - (int) ((bp->bp_vend)[0]), - (int) ((bp->bp_vend)[1]), - (int) ((bp->bp_vend)[2]), - (int) ((bp->bp_vend)[3])); - } - /* - * If this host isn't set for automatic vendor info then copy the - * specific cookie into the bootp packet, thus forcing a certain - * reply format. Only force reply format if user specified it. - */ - if (hp->flags.vm_cookie) { - /* Slam in the user specified magic number. */ - bcopy(hp->vm_cookie, bp->bp_vend, 4); - } - /* - * Figure out the format for the vendor-specific info. - * Note that bp->bp_vend may have been set above. - */ - if (!bcmp(bp->bp_vend, vm_rfc1048, 4)) { - /* RFC1048 conformant bootp client */ - dovend_rfc1048(bp, hp, bootsize); - if (debug > 1) { - report(LOG_INFO, "sending reply (with RFC1048 options)"); - } - } -#ifdef VEND_CMU - else if (!bcmp(bp->bp_vend, vm_cmu, 4)) { - dovend_cmu(bp, hp); - if (debug > 1) { - report(LOG_INFO, "sending reply (with CMU options)"); - } - } -#endif - else { - if (debug > 1) { - report(LOG_INFO, "sending reply (with no options)"); - } - } - - dest = (hp->flags.reply_addr) ? - hp->reply_addr.s_addr : 0L; - - /* not forwarded */ - sendreply(0, dest); -} - - -/* - * Process BOOTREPLY packet. - */ -PRIVATE void -handle_reply() -{ - if (debug) { - report(LOG_INFO, "processing boot reply"); - } - /* forwarded, no destination override */ - sendreply(1, 0); -} - - -/* - * Send a reply packet to the client. 'forward' flag is set if we are - * not the originator of this reply packet. - */ -PRIVATE void -sendreply(forward, dst_override) - int forward; - int32 dst_override; -{ - struct bootp *bp = (struct bootp *) pktbuf; - struct in_addr dst; - u_short port = bootpc_port; - unsigned char *ha; - int len; - - /* - * XXX - Should honor bp_flags "broadcast" bit here. - * Temporary workaround: use the :ra=ADDR: option to - * set the reply address to the broadcast address. - */ - - /* - * If the destination address was specified explicitly - * (i.e. the broadcast address for HP compatiblity) - * then send the response to that address. Otherwise, - * act in accordance with RFC951: - * If the client IP address is specified, use that - * else if gateway IP address is specified, use that - * else make a temporary arp cache entry for the client's - * NEW IP/hardware address and use that. - */ - if (dst_override) { - dst.s_addr = dst_override; - if (debug > 1) { - report(LOG_INFO, "reply address override: %s", - inet_ntoa(dst)); - } - } else if (bp->bp_ciaddr.s_addr) { - dst = bp->bp_ciaddr; - } else if (bp->bp_giaddr.s_addr && forward == 0) { - dst = bp->bp_giaddr; - port = bootps_port; - if (debug > 1) { - report(LOG_INFO, "sending reply to gateway %s", - inet_ntoa(dst)); - } - } else { - dst = bp->bp_yiaddr; - ha = bp->bp_chaddr; - len = bp->bp_hlen; - if (len > MAXHADDRLEN) - len = MAXHADDRLEN; - - if (debug > 1) - report(LOG_INFO, "setarp %s - %s", - inet_ntoa(dst), haddrtoa(ha, len)); - setarp(s, &dst, ha, len); - } - - if ((forward == 0) && - (bp->bp_siaddr.s_addr == 0)) - { - struct ifreq *ifr; - struct in_addr siaddr; - /* - * If we are originating this reply, we - * need to find our own interface address to - * put in the bp_siaddr field of the reply. - * If this server is multi-homed, pick the - * 'best' interface (the one on the same net - * as the client). Of course, the client may - * be on the other side of a BOOTP gateway... - */ - ifr = getif(s, &dst); - if (ifr) { - struct sockaddr_in *sip; - sip = (struct sockaddr_in *) &(ifr->ifr_addr); - siaddr = sip->sin_addr; - } else { - /* Just use my "official" IP address. */ - siaddr = my_ip_addr; - } - - /* XXX - No need to set bp_giaddr here. */ - - /* Finally, set the server address field. */ - bp->bp_siaddr = siaddr; - } - /* Set up socket address for send. */ - send_addr.sin_family = AF_INET; - send_addr.sin_port = htons(port); - send_addr.sin_addr = dst; - - /* Send reply with same size packet as request used. */ - if (sendto(s, pktbuf, pktlen, 0, - (struct sockaddr *) &send_addr, - sizeof(send_addr)) < 0) - { - report(LOG_ERR, "sendto: %s", get_network_errmsg()); - } -} /* sendreply */ - - -/* nmatch() - now in getif.c */ -/* setarp() - now in hwaddr.c */ - - -/* - * This call checks read access to a file. It returns 0 if the file given - * by "path" exists and is publically readable. A value of -1 is returned if - * access is not permitted or an error occurs. Successful calls also - * return the file size in bytes using the long pointer "filesize". - * - * The read permission bit for "other" users is checked. This bit must be - * set for tftpd(8) to allow clients to read the file. - */ - -PRIVATE int -chk_access(path, filesize) - char *path; - int32 *filesize; -{ - struct stat st; - - if ((stat(path, &st) == 0) && (st.st_mode & (S_IREAD >> 6))) { - *filesize = (int32) st.st_size; - return 0; - } else { - return -1; - } -} - - -/* - * Now in dumptab.c : - * dumptab() - * dump_host() - * list_ipaddresses() - */ - -#ifdef VEND_CMU - -/* - * Insert the CMU "vendor" data for the host pointed to by "hp" into the - * bootp packet pointed to by "bp". - */ - -PRIVATE void -dovend_cmu(bp, hp) - struct bootp *bp; - struct host *hp; -{ - struct cmu_vend *vendp; - struct in_addr_list *taddr; - - /* - * Initialize the entire vendor field to zeroes. - */ - bzero(bp->bp_vend, sizeof(bp->bp_vend)); - - /* - * Fill in vendor information. Subnet mask, default gateway, - * domain name server, ien name server, time server - */ - vendp = (struct cmu_vend *) bp->bp_vend; - strcpy(vendp->v_magic, (char *)vm_cmu); - if (hp->flags.subnet_mask) { - (vendp->v_smask).s_addr = hp->subnet_mask.s_addr; - (vendp->v_flags) |= VF_SMASK; - if (hp->flags.gateway) { - (vendp->v_dgate).s_addr = hp->gateway->addr->s_addr; - } - } - if (hp->flags.domain_server) { - taddr = hp->domain_server; - if (taddr->addrcount > 0) { - (vendp->v_dns1).s_addr = (taddr->addr)[0].s_addr; - if (taddr->addrcount > 1) { - (vendp->v_dns2).s_addr = (taddr->addr)[1].s_addr; - } - } - } - if (hp->flags.name_server) { - taddr = hp->name_server; - if (taddr->addrcount > 0) { - (vendp->v_ins1).s_addr = (taddr->addr)[0].s_addr; - if (taddr->addrcount > 1) { - (vendp->v_ins2).s_addr = (taddr->addr)[1].s_addr; - } - } - } - if (hp->flags.time_server) { - taddr = hp->time_server; - if (taddr->addrcount > 0) { - (vendp->v_ts1).s_addr = (taddr->addr)[0].s_addr; - if (taddr->addrcount > 1) { - (vendp->v_ts2).s_addr = (taddr->addr)[1].s_addr; - } - } - } - /* Log message now done by caller. */ -} /* dovend_cmu */ - -#endif /* VEND_CMU */ - - - -/* - * Insert the RFC1048 vendor data for the host pointed to by "hp" into the - * bootp packet pointed to by "bp". - */ -#define NEED(LEN, MSG) do \ - if (bytesleft < (LEN)) { \ - report(LOG_NOTICE, noroom, \ - hp->hostname->string, MSG); \ - return; \ - } while (0) -PRIVATE void -dovend_rfc1048(bp, hp, bootsize) - struct bootp *bp; - struct host *hp; - int32 bootsize; -{ - int bytesleft, len; - byte *vp; - char *tmpstr; - - static char noroom[] = "%s: No room for \"%s\" option"; - - vp = bp->bp_vend; - - if (hp->flags.msg_size) { - pktlen = hp->msg_size; - } else { - /* - * If the request was longer than the official length, build - * a response of that same length where the additional length - * is assumed to be part of the bp_vend (options) area. - */ - if (pktlen > sizeof(*bp)) { - if (debug > 1) - report(LOG_INFO, "request message length=%d", pktlen); - } - /* - * Check whether the request contains the option: - * Maximum DHCP Message Size (RFC1533 sec. 9.8) - * and if so, override the response length with its value. - * This request must lie within the first BP_VEND_LEN - * bytes of the option space. - */ - { - byte *p, *ep; - byte tag, len; - short msgsz = 0; - - p = vp + 4; - ep = p + BP_VEND_LEN - 4; - while (p < ep) { - tag = *p++; - /* Check for tags with no data first. */ - if (tag == TAG_PAD) - continue; - if (tag == TAG_END) - break; - /* Now scan the length byte. */ - len = *p++; - switch (tag) { - case TAG_MAX_MSGSZ: - if (len == 2) { - bcopy(p, (char*)&msgsz, 2); - msgsz = ntohs(msgsz); - } - break; - case TAG_SUBNET_MASK: - /* XXX - Should preserve this if given... */ - break; - } /* swtich */ - p += len; - } - - if (msgsz > sizeof(*bp)) { - if (debug > 1) - report(LOG_INFO, "request has DHCP msglen=%d", msgsz); - pktlen = msgsz; - } - } - } - - if (pktlen < sizeof(*bp)) { - report(LOG_ERR, "invalid response length=%d", pktlen); - pktlen = sizeof(*bp); - } - bytesleft = ((byte*)bp + pktlen) - vp; - if (pktlen > sizeof(*bp)) { - if (debug > 1) - report(LOG_INFO, "extended reply, length=%d, options=%d", - pktlen, bytesleft); - } - - /* Copy in the magic cookie */ - bcopy(vm_rfc1048, vp, 4); - vp += 4; - bytesleft -= 4; - - if (hp->flags.subnet_mask) { - /* always enough room here. */ - *vp++ = TAG_SUBNET_MASK;/* -1 byte */ - *vp++ = 4; /* -1 byte */ - insert_u_long(hp->subnet_mask.s_addr, &vp); /* -4 bytes */ - bytesleft -= 6; /* Fix real count */ - if (hp->flags.gateway) { - (void) insert_ip(TAG_GATEWAY, - hp->gateway, - &vp, &bytesleft); - } - } - if (hp->flags.bootsize) { - /* always enough room here */ - bootsize = (hp->flags.bootsize_auto) ? - ((bootsize + 511) / 512) : (hp->bootsize); /* Round up */ - *vp++ = TAG_BOOT_SIZE; - *vp++ = 2; - *vp++ = (byte) ((bootsize >> 8) & 0xFF); - *vp++ = (byte) (bootsize & 0xFF); - bytesleft -= 4; /* Tag, length, and 16 bit blocksize */ - } - /* - * This one is special: Remaining options go in the ext file. - * Only the subnet_mask, bootsize, and gateway should precede. - */ - if (hp->flags.exten_file) { - /* - * Check for room for exten_file. Add 3 to account for - * TAG_EXTEN_FILE, length, and TAG_END. - */ - len = strlen(hp->exten_file->string); - NEED((len + 3), "ef"); - *vp++ = TAG_EXTEN_FILE; - *vp++ = (byte) (len & 0xFF); - bcopy(hp->exten_file->string, vp, len); - vp += len; - *vp++ = TAG_END; - bytesleft -= len + 3; - return; /* no more options here. */ - } - /* - * The remaining options are inserted by the following - * function (which is shared with bootpef.c). - * Keep back one byte for the TAG_END. - */ - len = dovend_rfc1497(hp, vp, bytesleft - 1); - vp += len; - bytesleft -= len; - - /* There should be at least one byte left. */ - NEED(1, "(end)"); - *vp++ = TAG_END; - bytesleft--; - - /* Log message done by caller. */ - if (bytesleft > 0) { - /* - * Zero out any remaining part of the vendor area. - */ - bzero(vp, bytesleft); - } -} /* dovend_rfc1048 */ -#undef NEED - - -/* - * Now in readfile.c: - * hwlookcmp() - * iplookcmp() - */ - -/* haddrtoa() - now in hwaddr.c */ -/* - * Now in dovend.c: - * insert_ip() - * insert_generic() - * insert_u_long() - */ - -/* get_errmsg() - now in report.c */ - -/* - * Local Variables: - * tab-width: 4 - * c-indent-level: 4 - * c-argdecl-indent: 4 - * c-continued-statement-offset: 4 - * c-continued-brace-offset: -4 - * c-label-offset: -4 - * c-brace-offset: 0 - * End: - */ |
