itime.c revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#ifndef lint 33#if 0 34static char sccsid[] = "@(#)itime.c 8.1 (Berkeley) 6/5/93"; 35#endif 36static const char rcsid[] = 37 "$FreeBSD: stable/11/sbin/dump/itime.c 330897 2018-03-14 03:19:51Z eadler $"; 38#endif /* not lint */ 39 40#include <sys/param.h> 41#include <sys/queue.h> 42 43#include <ufs/ufs/dinode.h> 44 45#include <protocols/dumprestore.h> 46 47#include <errno.h> 48#include <fcntl.h> 49#include <limits.h> 50#include <stdio.h> 51#include <stdlib.h> 52#include <string.h> 53#include <time.h> 54#include <timeconv.h> 55 56#include "dump.h" 57 58struct dumptime { 59 struct dumpdates dt_value; 60 SLIST_ENTRY(dumptime) dt_list; 61}; 62SLIST_HEAD(dthead, dumptime) dthead = SLIST_HEAD_INITIALIZER(dthead); 63struct dumpdates **ddatev = NULL; 64int nddates = 0; 65 66static void dumprecout(FILE *, const struct dumpdates *); 67static int getrecord(FILE *, struct dumpdates *); 68static int makedumpdate(struct dumpdates *, const char *); 69static void readdumptimes(FILE *); 70 71void 72initdumptimes(void) 73{ 74 FILE *df; 75 76 if ((df = fopen(dumpdates, "r")) == NULL) { 77 if (errno != ENOENT) { 78 msg("WARNING: cannot read %s: %s\n", dumpdates, 79 strerror(errno)); 80 return; 81 } 82 /* 83 * Dumpdates does not exist, make an empty one. 84 */ 85 msg("WARNING: no file `%s', making an empty one\n", dumpdates); 86 if ((df = fopen(dumpdates, "w")) == NULL) { 87 msg("WARNING: cannot create %s: %s\n", dumpdates, 88 strerror(errno)); 89 return; 90 } 91 (void) fclose(df); 92 if ((df = fopen(dumpdates, "r")) == NULL) { 93 quit("cannot read %s even after creating it: %s\n", 94 dumpdates, strerror(errno)); 95 /* NOTREACHED */ 96 } 97 } 98 (void) flock(fileno(df), LOCK_SH); 99 readdumptimes(df); 100 (void) fclose(df); 101} 102 103static void 104readdumptimes(FILE *df) 105{ 106 int i; 107 struct dumptime *dtwalk; 108 109 for (;;) { 110 dtwalk = (struct dumptime *)calloc(1, sizeof (struct dumptime)); 111 if (getrecord(df, &(dtwalk->dt_value)) < 0) { 112 free(dtwalk); 113 break; 114 } 115 nddates++; 116 SLIST_INSERT_HEAD(&dthead, dtwalk, dt_list); 117 } 118 119 /* 120 * arrayify the list, leaving enough room for the additional 121 * record that we may have to add to the ddate structure 122 */ 123 ddatev = calloc((unsigned) (nddates + 1), sizeof (struct dumpdates *)); 124 dtwalk = SLIST_FIRST(&dthead); 125 for (i = nddates - 1; i >= 0; i--, dtwalk = SLIST_NEXT(dtwalk, dt_list)) 126 ddatev[i] = &dtwalk->dt_value; 127} 128 129void 130getdumptime(void) 131{ 132 struct dumpdates *ddp; 133 int i; 134 char *fname; 135 136 fname = disk; 137#ifdef FDEBUG 138 msg("Looking for name %s in dumpdates = %s for level = %d\n", 139 fname, dumpdates, level); 140#endif 141 spcl.c_ddate = 0; 142 lastlevel = 0; 143 144 initdumptimes(); 145 /* 146 * Go find the entry with the same name for a lower increment 147 * and older date 148 */ 149 ITITERATE(i, ddp) { 150 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0) 151 continue; 152 if (ddp->dd_level >= level) 153 continue; 154 if (ddp->dd_ddate <= _time64_to_time(spcl.c_ddate)) 155 continue; 156 spcl.c_ddate = _time_to_time64(ddp->dd_ddate); 157 lastlevel = ddp->dd_level; 158 } 159} 160 161void 162putdumptime(void) 163{ 164 FILE *df; 165 struct dumpdates *dtwalk; 166 int i; 167 int fd; 168 char *fname; 169 char *tmsg; 170 171 if(uflag == 0) 172 return; 173 if ((df = fopen(dumpdates, "r+")) == NULL) 174 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno)); 175 fd = fileno(df); 176 (void) flock(fd, LOCK_EX); 177 fname = disk; 178 free(ddatev); 179 ddatev = NULL; 180 nddates = 0; 181 readdumptimes(df); 182 if (fseek(df, 0L, 0) < 0) 183 quit("fseek: %s\n", strerror(errno)); 184 spcl.c_ddate = 0; 185 ITITERATE(i, dtwalk) { 186 if (strncmp(fname, dtwalk->dd_name, 187 sizeof (dtwalk->dd_name)) != 0) 188 continue; 189 if (dtwalk->dd_level != level) 190 continue; 191 goto found; 192 } 193 /* 194 * construct the new upper bound; 195 * Enough room has been allocated. 196 */ 197 dtwalk = ddatev[nddates] = 198 (struct dumpdates *)calloc(1, sizeof (struct dumpdates)); 199 nddates += 1; 200 found: 201 (void) strncpy(dtwalk->dd_name, fname, sizeof (dtwalk->dd_name)); 202 dtwalk->dd_level = level; 203 dtwalk->dd_ddate = _time64_to_time(spcl.c_date); 204 205 ITITERATE(i, dtwalk) { 206 dumprecout(df, dtwalk); 207 } 208 if (fflush(df)) 209 quit("%s: %s\n", dumpdates, strerror(errno)); 210 if (ftruncate(fd, ftell(df))) 211 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno)); 212 (void) fclose(df); 213 if (spcl.c_date == 0) { 214 tmsg = "the epoch\n"; 215 } else { 216 time_t t = _time64_to_time(spcl.c_date); 217 tmsg = ctime(&t); 218 } 219 msg("level %d dump on %s", level, tmsg); 220} 221 222static void 223dumprecout(FILE *file, const struct dumpdates *what) 224{ 225 226 if (strlen(what->dd_name) > DUMPFMTLEN) 227 quit("Name '%s' exceeds DUMPFMTLEN (%d) bytes\n", 228 what->dd_name, DUMPFMTLEN); 229 if (fprintf(file, DUMPOUTFMT, DUMPFMTLEN, what->dd_name, 230 what->dd_level, ctime(&what->dd_ddate)) < 0) 231 quit("%s: %s\n", dumpdates, strerror(errno)); 232} 233 234int recno; 235 236static int 237getrecord(FILE *df, struct dumpdates *ddatep) 238{ 239 char tbuf[BUFSIZ]; 240 241 recno = 0; 242 if ( (fgets(tbuf, sizeof (tbuf), df)) != tbuf) 243 return(-1); 244 recno++; 245 if (makedumpdate(ddatep, tbuf) < 0) 246 msg("Unknown intermediate format in %s, line %d\n", 247 dumpdates, recno); 248 249#ifdef FDEBUG 250 msg("getrecord: %s %d %s", ddatep->dd_name, ddatep->dd_level, 251 ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate)); 252#endif 253 return(0); 254} 255 256static int 257makedumpdate(struct dumpdates *ddp, const char *tbuf) 258{ 259 char un_buf[128]; 260 261 (void) sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf); 262 ddp->dd_ddate = unctime(un_buf); 263 if (ddp->dd_ddate < 0) 264 return(-1); 265 return(0); 266} 267