/* * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Rick Macklem at The University of Guelph. * * 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 char sccsid[] = "@(#)diskless_boot.c 5.1 (Berkeley) 7/16/89"; #endif /* not lint */ #include <stdio.h> #include <fcntl.h> #include <netdb.h> #include <strings.h> #include <sys/types.h> #include <sys/param.h> #include <sys/socket.h> #include <netinet/in.h> #ifdef BSD4_4 #include <sys/ucred.h> #include <sys/mount.h> #include <net/if.h> #include <nfs/nfsv2.h> #include <nfs/nfsdiskless.h> #else #include "ucred.h" #include "mount.h" #include "if.h" #include "nfsv2.h" #include "nfsdiskless.h" #endif /* BSD4_4 */ #include "pathnames.h" /* * These two library functions are meant to be called by a net boot server, * such as a hacked tftpd, to open and read the boot file being gotten. * They expect files to be set up in the /var/diskless subtree for the * requesting client. * The file /var/diskless/boot.<client> is an ascii file with 1 or 2 lines. * line 1: the path name of the vmunix object file to be sent for that client * line 2: the path name and file byte offset of the nfs_diskless structure to * be filled in at the given offset (this is optional and the file * is normally created by diskless_setup(8) and the offset is * calculated by diskless_offset(8), run on the vmunix object file.) */ /* * Static structure for keeping boot file data. */ struct diskless_bootdata { int fd; /* File descriptor for boot file */ int offset; /* Byte offset in file */ int ndoff; /* Byte offset of nfs_diskless */ int len; /* Length of nfs_diskless in bytes */ struct nfs_diskless nd; /* nfs_diskless structure itself */ }; static struct diskless_bootdata netb; #define LINSIZ 1024 /* * Open a vmunix object file for net booting. * The one argument is the client's internet address. */ open_boot(claddr) struct sockaddr_in *claddr; { register char *cp; struct hostent *hp; FILE *bootf; int fd, ret; char line[LINSIZ], fname[MAXPATHLEN]; /* * First, get the official name for this client. */ if ((hp = gethostbyaddr((caddr_t)&claddr->sin_addr.s_addr, sizeof (u_long), AF_INET)) == NULL) return (-1); /* * Get the boot file for this client. */ strcpy(fname, _PATH_BOOTF); strcat(fname, "."); strncat(fname, hp->h_name, MAXPATHLEN - 1 - strlen(fname)); fname[MAXPATHLEN - 1] = '\0'; if ((bootf = fopen(fname, "r")) == NULL) return (-1); if (fgets(line, LINSIZ, bootf) == NULL) { fclose(bootf); return (-1); } cp = strtok(line, " \t\n"); if (cp == (char *)0 || (netb.fd = open(cp, O_RDONLY, 0)) < 0) { fclose(bootf); return (-1); } netb.offset = 0; netb.ndoff = -1; netb.len = sizeof (struct nfs_diskless); if (fgets(line, LINSIZ, bootf)) { fclose(bootf); cp = strtok(line, " \t\n"); if (cp == (char *)0 || (fd = open(cp, O_RDONLY, 0)) < 0) { close(netb.fd); return (-1); } ret = read(fd, &netb.nd, sizeof (struct nfs_diskless)); close(fd); cp = strtok((char *)0, " \t\n"); if (ret != sizeof (struct nfs_diskless) || cp == (char *)0) { close(netb.fd); return (-1); } netb.ndoff = atoi(cp); } else fclose(bootf); return (netb.fd); } /* * Read the next block of the boot file. * Just do a read, except overlay the nfs_diskless structure, as required. */ read_boot(fd, buf, siz) int fd; char *buf; int siz; { register int ret, len; char *netcp, *bufcp; ret = read(fd, buf, siz); if (fd != netb.fd || ret <= 0 || netb.ndoff == -1) return (ret); if (netb.offset < netb.ndoff) { netcp = (caddr_t)&netb.nd; bufcp = buf + (netb.ndoff - netb.offset); len = netb.offset + ret - netb.ndoff; } else { bufcp = buf; netcp = ((caddr_t)&netb.nd) + (netb.offset - netb.ndoff); len = netb.ndoff + netb.len - netb.offset; } if (len > 0) bcopy(netcp, bufcp, len); netb.offset += ret; return (ret); }