1 /* $OpenBSD: itime.c,v 1.26 2023/12/21 08:01:21 otto 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 int nddates = 0; 51 struct dumpdates **ddatev = NULL; 52 char *dumpdates = NULL; 53 char lastlevel = 0; 54 int ddates_in = 0; 55 struct dumptime *dthead = NULL; 56 57 static void dumprecout(FILE *, struct dumpdates *); 58 static int getrecord(FILE *, struct dumpdates *); 59 static int makedumpdate(struct dumpdates *, char *); 60 static void readdumptimes(FILE *); 61 62 void 63 initdumptimes(void) 64 { 65 FILE *df; 66 67 if ((df = fopen(dumpdates, "r")) == NULL) { 68 if (errno != ENOENT) { 69 quit("cannot read %s: %s\n", dumpdates, 70 strerror(errno)); 71 /* NOTREACHED */ 72 } 73 /* 74 * Dumpdates does not exist, make an empty one. 75 */ 76 msg("WARNING: no file `%s', making an empty one\n", dumpdates); 77 if ((df = fopen(dumpdates, "w")) == NULL) { 78 quit("cannot create %s: %s\n", dumpdates, 79 strerror(errno)); 80 /* NOTREACHED */ 81 } 82 (void) fclose(df); 83 if ((df = fopen(dumpdates, "r")) == NULL) { 84 quit("cannot read %s even after creating it: %s\n", 85 dumpdates, strerror(errno)); 86 /* NOTREACHED */ 87 } 88 } 89 (void) flock(fileno(df), LOCK_SH); 90 readdumptimes(df); 91 (void) fclose(df); 92 } 93 94 static void 95 readdumptimes(FILE *df) 96 { 97 int i; 98 struct dumptime *dtwalk; 99 100 for (;;) { 101 dtwalk = calloc(1, sizeof(struct dumptime)); 102 if (dtwalk == NULL) 103 quit("allocation failed"); 104 if (getrecord(df, &(dtwalk->dt_value)) < 0) { 105 free(dtwalk); 106 break; 107 } 108 nddates++; 109 dtwalk->dt_next = dthead; 110 dthead = dtwalk; 111 } 112 113 ddates_in = 1; 114 /* 115 * arrayify the list, leaving enough room for the additional 116 * record that we may have to add to the ddate structure 117 */ 118 ddatev = calloc((unsigned) (nddates + 1), sizeof(struct dumpdates *)); 119 if (ddatev == NULL) 120 quit("allocation failed"); 121 dtwalk = dthead; 122 for (i = nddates - 1; i >= 0; i--, dtwalk = dtwalk->dt_next) 123 ddatev[i] = &dtwalk->dt_value; 124 } 125 126 void 127 getdumptime(void) 128 { 129 struct dumpdates *ddp; 130 int i; 131 char *fname; 132 133 fname = duid ? duid : disk; 134 #ifdef FDEBUG 135 msg("Looking for name %s in dumpdates = %s for level = %c\n", 136 fname, dumpdates, level); 137 #endif 138 spcl.c_ddate = 0; 139 lastlevel = '0'; 140 141 initdumptimes(); 142 /* 143 * Go find the entry with the same name for a lower increment 144 * and older date 145 */ 146 ITITERATE(i, ddp) { 147 if ((strncmp(fname, ddp->dd_name, sizeof(ddp->dd_name)) != 0) && 148 (strncmp(disk, ddp->dd_name, sizeof(ddp->dd_name)) != 0)) 149 continue; 150 if (ddp->dd_level >= level) 151 continue; 152 if (ddp->dd_ddate <= (time_t)spcl.c_ddate) 153 continue; 154 spcl.c_ddate = (int64_t)ddp->dd_ddate; 155 lastlevel = ddp->dd_level; 156 } 157 } 158 159 void 160 putdumptime(void) 161 { 162 FILE *df; 163 struct dumpdates *dtwalk; 164 int fd, i; 165 char *fname; 166 time_t t; 167 168 if(uflag == 0) 169 return; 170 if ((df = fopen(dumpdates, "r+")) == NULL) 171 quit("cannot rewrite %s: %s\n", dumpdates, strerror(errno)); 172 fd = fileno(df); 173 (void) flock(fd, LOCK_EX); 174 fname = duid ? duid : disk; 175 free(ddatev); 176 ddatev = NULL; 177 nddates = 0; 178 dthead = NULL; 179 ddates_in = 0; 180 readdumptimes(df); 181 if (fseek(df, 0L, SEEK_SET) == -1) 182 quit("fseek: %s\n", strerror(errno)); 183 spcl.c_ddate = 0; 184 ITITERATE(i, dtwalk) { 185 if ((strncmp(fname, dtwalk->dd_name, 186 sizeof(dtwalk->dd_name)) != 0) && 187 (strncmp(disk, dtwalk->dd_name, 188 sizeof(dtwalk->dd_name)) != 0)) 189 continue; 190 if (dtwalk->dd_level != level) 191 continue; 192 goto found; 193 } 194 /* 195 * construct the new upper bound; 196 * Enough room has been allocated. 197 */ 198 dtwalk = ddatev[nddates] = calloc(1, sizeof(struct dumpdates)); 199 if (dtwalk == NULL) 200 quit("allocation failed"); 201 nddates += 1; 202 found: 203 (void) strlcpy(dtwalk->dd_name, fname, sizeof(dtwalk->dd_name)); 204 dtwalk->dd_level = level; 205 dtwalk->dd_ddate = (time_t)spcl.c_date; 206 207 ITITERATE(i, dtwalk) { 208 dumprecout(df, dtwalk); 209 } 210 if (fflush(df)) 211 quit("%s: %s\n", dumpdates, strerror(errno)); 212 if (ftruncate(fd, ftello(df))) 213 quit("ftruncate (%s): %s\n", dumpdates, strerror(errno)); 214 (void) fclose(df); 215 t = (time_t)spcl.c_date; 216 msg("level %c dump on %s", level, t == 0 ? "the epoch\n" : ctime(&t)); 217 } 218 219 static void 220 dumprecout(FILE *file, struct dumpdates *what) 221 { 222 223 if (fprintf(file, DUMPOUTFMT, 224 what->dd_name, 225 what->dd_level, 226 ctime(&what->dd_ddate)) < 0) 227 quit("%s: %s\n", dumpdates, strerror(errno)); 228 } 229 230 int recno; 231 232 static int 233 getrecord(FILE *df, struct dumpdates *ddatep) 234 { 235 char tbuf[BUFSIZ]; 236 237 recno = 0; 238 if (fgets(tbuf, sizeof(tbuf), df) == NULL) 239 return(-1); 240 recno++; 241 if (makedumpdate(ddatep, tbuf) < 0) 242 msg("Unknown intermediate format in %s, line %d\n", 243 dumpdates, recno); 244 245 #ifdef FDEBUG 246 msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level, 247 ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate)); 248 #endif 249 return(0); 250 } 251 252 static int 253 makedumpdate(struct dumpdates *ddp, char *tbuf) 254 { 255 char un_buf[BUFSIZ], *str; 256 struct tm then; 257 258 if (sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf) != 3) 259 return(-1); 260 str = getduid(ddp->dd_name); 261 if (str != NULL) { 262 strlcpy(ddp->dd_name, str, sizeof(ddp->dd_name)); 263 free(str); 264 } 265 str = strptime(un_buf, "%a %b %e %H:%M:%S %Y", &then); 266 then.tm_isdst = -1; 267 if (str == NULL || (*str != '\n' && *str != '\0')) 268 ddp->dd_ddate = (time_t) -1; 269 else 270 ddp->dd_ddate = mktime(&then); 271 if (ddp->dd_ddate < 0) 272 return(-1); 273 return(0); 274 } 275