1 /* $OpenBSD: itime.c,v 1.24 2019/06/28 13:32:43 deraadt Exp $ */ 2 /* $NetBSD: itime.c,v 1.4 1997/04/15 01:09:50 lukem Exp $ */ 3 4 /*- 5 * Copyright (c) 1980, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> /* MAXBSIZE */ 34 #include <sys/time.h> 35 #include <ufs/ufs/dinode.h> 36 37 #include <protocols/dumprestore.h> 38 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <stdio.h> 42 #include <time.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include <limits.h> 47 48 #include "dump.h" 49 50 struct dumpdates **ddatev = NULL; 51 int nddates = 0; 52 int ddates_in = 0; 53 struct dumptime *dthead = NULL; 54 55 static void dumprecout(FILE *, struct dumpdates *); 56 static int getrecord(FILE *, struct dumpdates *); 57 static int makedumpdate(struct dumpdates *, char *); 58 static void readdumptimes(FILE *); 59 60 void 61 initdumptimes(void) 62 { 63 FILE *df; 64 65 if ((df = fopen(dumpdates, "r")) == NULL) { 66 if (errno != ENOENT) { 67 quit("cannot read %s: %s\n", dumpdates, 68 strerror(errno)); 69 /* NOTREACHED */ 70 } 71 /* 72 * Dumpdates does not exist, make an empty one. 73 */ 74 msg("WARNING: no file `%s', making an empty one\n", dumpdates); 75 if ((df = fopen(dumpdates, "w")) == NULL) { 76 quit("cannot create %s: %s\n", dumpdates, 77 strerror(errno)); 78 /* NOTREACHED */ 79 } 80 (void) fclose(df); 81 if ((df = fopen(dumpdates, "r")) == NULL) { 82 quit("cannot read %s even after creating it: %s\n", 83 dumpdates, strerror(errno)); 84 /* NOTREACHED */ 85 } 86 } 87 (void) flock(fileno(df), LOCK_SH); 88 readdumptimes(df); 89 (void) fclose(df); 90 } 91 92 static void 93 readdumptimes(FILE *df) 94 { 95 int i; 96 struct dumptime *dtwalk; 97 98 for (;;) { 99 dtwalk = calloc(1, sizeof(struct dumptime)); 100 if (getrecord(df, &(dtwalk->dt_value)) < 0) { 101 free(dtwalk); 102 break; 103 } 104 nddates++; 105 dtwalk->dt_next = dthead; 106 dthead = dtwalk; 107 } 108 109 ddates_in = 1; 110 /* 111 * arrayify the list, leaving enough room for the additional 112 * record that we may have to add to the ddate structure 113 */ 114 ddatev = calloc((unsigned) (nddates + 1), sizeof(struct dumpdates *)); 115 dtwalk = dthead; 116 for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next) 117 ddatev[i] = &dtwalk->dt_value; 118 } 119 120 void 121 getdumptime(void) 122 { 123 struct dumpdates *ddp; 124 int i; 125 char *fname; 126 127 fname = duid ? duid : disk; 128 #ifdef FDEBUG 129 msg("Looking for name %s in dumpdates = %s for level = %c\n", 130 fname, dumpdates, level); 131 #endif 132 spcl.c_ddate = 0; 133 lastlevel = '0'; 134 135 initdumptimes(); 136 /* 137 * Go find the entry with the same name for a lower increment 138 * and older date 139 */ 140 ITITERATE(i, ddp) { 141 if ((strncmp(fname, ddp->dd_name, sizeof(ddp->dd_name)) != 0) && 142 (strncmp(disk, ddp->dd_name, sizeof(ddp->dd_name)) != 0)) 143 continue; 144 if (ddp->dd_level >= level) 145 continue; 146 if (ddp->dd_ddate <= (time_t)spcl.c_ddate) 147 continue; 148 spcl.c_ddate = (int64_t)ddp->dd_ddate; 149 lastlevel = ddp->dd_level; 150 } 151 } 152 153 void 154 putdumptime(void) 155 { 156 FILE *df; 157 struct dumpdates *dtwalk; 158 int fd, i; 159 char *fname; 160 time_t t; 161 162 if(uflag == 0) 163 return; 164 if ((df = fopen(dumpdates, "r+")) == NULL) 165 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno)); 166 fd = fileno(df); 167 (void) flock(fd, LOCK_EX); 168 fname = duid ? duid : disk; 169 free(ddatev); 170 ddatev = NULL; 171 nddates = 0; 172 dthead = NULL; 173 ddates_in = 0; 174 readdumptimes(df); 175 if (fseek(df, 0L, SEEK_SET) == -1) 176 quit("fseek: %s\n", strerror(errno)); 177 spcl.c_ddate = 0; 178 ITITERATE(i, dtwalk) { 179 if ((strncmp(fname, dtwalk->dd_name, 180 sizeof(dtwalk->dd_name)) != 0) && 181 (strncmp(disk, dtwalk->dd_name, 182 sizeof(dtwalk->dd_name)) != 0)) 183 continue; 184 if (dtwalk->dd_level != level) 185 continue; 186 goto found; 187 } 188 /* 189 * construct the new upper bound; 190 * Enough room has been allocated. 191 */ 192 dtwalk = ddatev[nddates] = calloc(1, sizeof(struct dumpdates)); 193 nddates += 1; 194 found: 195 (void) strlcpy(dtwalk->dd_name, fname, sizeof(dtwalk->dd_name)); 196 dtwalk->dd_level = level; 197 dtwalk->dd_ddate = (time_t)spcl.c_date; 198 199 ITITERATE(i, dtwalk) { 200 dumprecout(df, dtwalk); 201 } 202 if (fflush(df)) 203 quit("%s: %s\n", dumpdates, strerror(errno)); 204 if (ftruncate(fd, ftello(df))) 205 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno)); 206 (void) fclose(df); 207 t = (time_t)spcl.c_date; 208 msg("level %c dump on %s", level, t == 0 ? "the epoch\n" : ctime(&t)); 209 } 210 211 static void 212 dumprecout(FILE *file, struct dumpdates *what) 213 { 214 215 if (fprintf(file, DUMPOUTFMT, 216 what->dd_name, 217 what->dd_level, 218 ctime(&what->dd_ddate)) < 0) 219 quit("%s: %s\n", dumpdates, strerror(errno)); 220 } 221 222 int recno; 223 224 static int 225 getrecord(FILE *df, struct dumpdates *ddatep) 226 { 227 char tbuf[BUFSIZ]; 228 229 recno = 0; 230 if (fgets(tbuf, sizeof(tbuf), df) == NULL) 231 return(-1); 232 recno++; 233 if (makedumpdate(ddatep, tbuf) < 0) 234 msg("Unknown intermediate format in %s, line %d\n", 235 dumpdates, recno); 236 237 #ifdef FDEBUG 238 msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level, 239 ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate)); 240 #endif 241 return(0); 242 } 243 244 static int 245 makedumpdate(struct dumpdates *ddp, char *tbuf) 246 { 247 char un_buf[BUFSIZ], *str; 248 struct tm then; 249 250 if (sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf) != 3) 251 return(-1); 252 str = getduid(ddp->dd_name); 253 if (str != NULL) { 254 strlcpy(ddp->dd_name, str, sizeof(ddp->dd_name)); 255 free(str); 256 } 257 str = strptime(un_buf, "%a %b %e %H:%M:%S %Y", &then); 258 then.tm_isdst = -1; 259 if (str == NULL || (*str != '\n' && *str != '\0')) 260 ddp->dd_ddate = (time_t) -1; 261 else 262 ddp->dd_ddate = mktime(&then); 263 if (ddp->dd_ddate < 0) 264 return(-1); 265 return(0); 266 } 267