1 /*- 2 * Copyright 1986, Larry Wall 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following condition is met: 6 * 1. Redistributions of source code must retain the above copyright notice, 7 * this condition and the following disclaimer. 8 * 9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 10 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 11 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 12 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 13 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 14 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 15 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 16 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 17 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 18 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 19 * SUCH DAMAGE. 20 * 21 * patch - a program to apply diffs to original files 22 * 23 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 24 * behaviour 25 * 26 * $OpenBSD: inp.c,v 1.36 2012/04/10 14:46:34 ajacoutot Exp $ 27 * $FreeBSD: head/usr.bin/patch/inp.c 246091 2013-01-29 20:05:16Z delphij $ 28 */ 29 30 #include <sys/types.h> 31 #include <sys/file.h> 32 #include <sys/stat.h> 33 #include <sys/mman.h> 34 35 #include <ctype.h> 36 #include <libgen.h> 37 #include <limits.h> 38 #include <stddef.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "common.h" 45 #include "util.h" 46 #include "pch.h" 47 #include "inp.h" 48 49 50 /* Input-file-with-indexable-lines abstract type */ 51 52 static size_t i_size; /* size of the input file */ 53 static char *i_womp; /* plan a buffer for entire file */ 54 static char **i_ptr; /* pointers to lines in i_womp */ 55 static char empty_line[] = { '\0' }; 56 57 static int tifd = -1; /* plan b virtual string array */ 58 static char *tibuf[2]; /* plan b buffers */ 59 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 60 static LINENUM lines_per_buf; /* how many lines per buffer */ 61 static int tireclen; /* length of records in tmp file */ 62 63 static bool rev_in_string(const char *); 64 static bool reallocate_lines(size_t *); 65 66 /* returns false if insufficient memory */ 67 static bool plan_a(const char *); 68 69 static void plan_b(const char *); 70 71 /* New patch--prepare to edit another file. */ 72 73 void 74 re_input(void) 75 { 76 if (using_plan_a) { 77 free(i_ptr); 78 i_ptr = NULL; 79 if (i_womp != NULL) { 80 munmap(i_womp, i_size); 81 i_womp = NULL; 82 } 83 i_size = 0; 84 } else { 85 using_plan_a = true; /* maybe the next one is smaller */ 86 close(tifd); 87 tifd = -1; 88 free(tibuf[0]); 89 free(tibuf[1]); 90 tibuf[0] = tibuf[1] = NULL; 91 tiline[0] = tiline[1] = -1; 92 tireclen = 0; 93 } 94 } 95 96 /* Construct the line index, somehow or other. */ 97 98 void 99 scan_input(const char *filename) 100 { 101 if (!plan_a(filename)) 102 plan_b(filename); 103 if (verbose) { 104 say("Patching file %s using Plan %s...\n", filename, 105 (using_plan_a ? "A" : "B")); 106 } 107 } 108 109 static bool 110 reallocate_lines(size_t *lines_allocated) 111 { 112 char **p; 113 size_t new_size; 114 115 new_size = *lines_allocated * 3 / 2; 116 p = realloc(i_ptr, (new_size + 2) * sizeof(char *)); 117 if (p == NULL) { /* shucks, it was a near thing */ 118 munmap(i_womp, i_size); 119 i_womp = NULL; 120 free(i_ptr); 121 i_ptr = NULL; 122 *lines_allocated = 0; 123 return false; 124 } 125 *lines_allocated = new_size; 126 i_ptr = p; 127 return true; 128 } 129 130 /* Try keeping everything in memory. */ 131 132 static bool 133 plan_a(const char *filename) 134 { 135 int ifd, statfailed; 136 char *p, *s; 137 struct stat filestat; 138 ptrdiff_t sz; 139 size_t i; 140 size_t iline, lines_allocated; 141 142 #ifdef DEBUGGING 143 if (debug & 8) 144 return false; 145 #endif 146 147 if (filename == NULL || *filename == '\0') 148 return false; 149 150 statfailed = stat(filename, &filestat); 151 if (statfailed && ok_to_create_file) { 152 if (verbose) 153 say("(Creating file %s...)\n", filename); 154 155 /* 156 * in check_patch case, we still display `Creating file' even 157 * though we're not. The rule is that -C should be as similar 158 * to normal patch behavior as possible 159 */ 160 if (check_only) 161 return true; 162 makedirs(filename, true); 163 close(creat(filename, 0666)); 164 statfailed = stat(filename, &filestat); 165 } 166 if (statfailed && check_only) 167 fatal("%s not found, -C mode, can't probe further\n", filename); 168 /* 169 * For nonexistent or read-only files we no longer attempt to locate 170 * or checkout the file via RCS or SCCS, or do any call to system() 171 * whatsoever. CVE-2015-1416. 172 */ 173 if (statfailed || 174 /* No one can write to it. */ 175 (filestat.st_mode & 0222) == 0 || 176 /* I can't write to it. */ 177 ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { 178 if (statfailed) 179 fatal("can't find %s\n", filename); 180 } 181 filemode = filestat.st_mode; 182 if (!S_ISREG(filemode)) 183 fatal("%s is not a normal file--can't patch\n", filename); 184 if ((uint64_t)filestat.st_size > SIZE_MAX) { 185 say("block too large to mmap\n"); 186 return false; 187 } 188 i_size = (size_t)filestat.st_size; 189 if (out_of_mem) { 190 set_hunkmax(); /* make sure dynamic arrays are allocated */ 191 out_of_mem = false; 192 return false; /* force plan b because plan a bombed */ 193 } 194 if ((ifd = open(filename, O_RDONLY)) < 0) 195 pfatal("can't open file %s", filename); 196 197 if (i_size) { 198 i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); 199 if (i_womp == MAP_FAILED) { 200 perror("mmap failed"); 201 i_womp = NULL; 202 close(ifd); 203 return false; 204 } 205 } else { 206 i_womp = NULL; 207 } 208 209 close(ifd); 210 if (i_size) 211 madvise(i_womp, i_size, MADV_SEQUENTIAL); 212 213 /* estimate the number of lines */ 214 lines_allocated = i_size / 25; 215 if (lines_allocated < 100) 216 lines_allocated = 100; 217 218 if (!reallocate_lines(&lines_allocated)) 219 return false; 220 221 /* now scan the buffer and build pointer array */ 222 iline = 1; 223 i_ptr[iline] = i_womp; 224 /* test for NUL too, to maintain the behavior of the original code */ 225 for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { 226 if (*s == '\n') { 227 if (iline == lines_allocated) { 228 if (!reallocate_lines(&lines_allocated)) 229 return false; 230 } 231 /* these are NOT NUL terminated */ 232 i_ptr[++iline] = s + 1; 233 } 234 } 235 /* if the last line contains no EOL, append one */ 236 if (i_size > 0 && i_womp[i_size - 1] != '\n') { 237 last_line_missing_eol = true; 238 /* fix last line */ 239 sz = s - i_ptr[iline]; 240 p = malloc(sz + 1); 241 if (p == NULL) { 242 free(i_ptr); 243 i_ptr = NULL; 244 munmap(i_womp, i_size); 245 i_womp = NULL; 246 return false; 247 } 248 249 memcpy(p, i_ptr[iline], sz); 250 p[sz] = '\n'; 251 i_ptr[iline] = p; 252 /* count the extra line and make it point to some valid mem */ 253 i_ptr[++iline] = empty_line; 254 } else 255 last_line_missing_eol = false; 256 257 input_lines = iline - 1; 258 259 /* now check for revision, if any */ 260 261 if (revision != NULL) { 262 if (!rev_in_string(i_womp)) { 263 if (force) { 264 if (verbose) 265 say("Warning: this file doesn't appear " 266 "to be the %s version--patching anyway.\n", 267 revision); 268 } else if (batch) { 269 fatal("this file doesn't appear to be the " 270 "%s version--aborting.\n", 271 revision); 272 } else { 273 ask("This file doesn't appear to be the " 274 "%s version--patch anyway? [n] ", 275 revision); 276 if (*buf != 'y') 277 fatal("aborted\n"); 278 } 279 } else if (verbose) 280 say("Good. This file appears to be the %s version.\n", 281 revision); 282 } 283 return true; /* plan a will work */ 284 } 285 286 /* Keep (virtually) nothing in memory. */ 287 288 static void 289 plan_b(const char *filename) 290 { 291 FILE *ifp; 292 size_t i = 0, j, maxlen = 1; 293 char *p; 294 bool found_revision = (revision == NULL); 295 296 using_plan_a = false; 297 if ((ifp = fopen(filename, "r")) == NULL) 298 pfatal("can't open file %s", filename); 299 unlink(TMPINNAME); 300 if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) 301 pfatal("can't open file %s", TMPINNAME); 302 while (fgets(buf, buf_size, ifp) != NULL) { 303 if (revision != NULL && !found_revision && rev_in_string(buf)) 304 found_revision = true; 305 if ((i = strlen(buf)) > maxlen) 306 maxlen = i; /* find longest line */ 307 } 308 last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; 309 if (last_line_missing_eol && maxlen == i) 310 maxlen++; 311 312 if (revision != NULL) { 313 if (!found_revision) { 314 if (force) { 315 if (verbose) 316 say("Warning: this file doesn't appear " 317 "to be the %s version--patching anyway.\n", 318 revision); 319 } else if (batch) { 320 fatal("this file doesn't appear to be the " 321 "%s version--aborting.\n", 322 revision); 323 } else { 324 ask("This file doesn't appear to be the %s " 325 "version--patch anyway? [n] ", 326 revision); 327 if (*buf != 'y') 328 fatal("aborted\n"); 329 } 330 } else if (verbose) 331 say("Good. This file appears to be the %s version.\n", 332 revision); 333 } 334 fseek(ifp, 0L, SEEK_SET); /* rewind file */ 335 lines_per_buf = BUFFERSIZE / maxlen; 336 tireclen = maxlen; 337 tibuf[0] = malloc(BUFFERSIZE + 1); 338 if (tibuf[0] == NULL) 339 fatal("out of memory\n"); 340 tibuf[1] = malloc(BUFFERSIZE + 1); 341 if (tibuf[1] == NULL) 342 fatal("out of memory\n"); 343 for (i = 1;; i++) { 344 p = tibuf[0] + maxlen * (i % lines_per_buf); 345 if (i % lines_per_buf == 0) /* new block */ 346 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 347 pfatal("can't write temp file"); 348 if (fgets(p, maxlen + 1, ifp) == NULL) { 349 input_lines = i - 1; 350 if (i % lines_per_buf != 0) 351 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 352 pfatal("can't write temp file"); 353 break; 354 } 355 j = strlen(p); 356 /* These are '\n' terminated strings, so no need to add a NUL */ 357 if (j == 0 || p[j - 1] != '\n') 358 p[j] = '\n'; 359 } 360 fclose(ifp); 361 close(tifd); 362 if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) 363 pfatal("can't reopen file %s", TMPINNAME); 364 } 365 366 /* 367 * Fetch a line from the input file, \n terminated, not necessarily \0. 368 */ 369 char * 370 ifetch(LINENUM line, int whichbuf) 371 { 372 if (line < 1 || line > input_lines) { 373 if (warn_on_invalid_line) { 374 say("No such line %ld in input file, ignoring\n", line); 375 warn_on_invalid_line = false; 376 } 377 return NULL; 378 } 379 if (using_plan_a) 380 return i_ptr[line]; 381 else { 382 LINENUM offline = line % lines_per_buf; 383 LINENUM baseline = line - offline; 384 385 if (tiline[0] == baseline) 386 whichbuf = 0; 387 else if (tiline[1] == baseline) 388 whichbuf = 1; 389 else { 390 tiline[whichbuf] = baseline; 391 392 if (lseek(tifd, (off_t) (baseline / lines_per_buf * 393 BUFFERSIZE), SEEK_SET) < 0) 394 pfatal("cannot seek in the temporary input file"); 395 396 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) 397 pfatal("error reading tmp file %s", TMPINNAME); 398 } 399 return tibuf[whichbuf] + (tireclen * offline); 400 } 401 } 402 403 /* 404 * True if the string argument contains the revision number we want. 405 */ 406 static bool 407 rev_in_string(const char *string) 408 { 409 const char *s; 410 size_t patlen; 411 412 if (revision == NULL) 413 return true; 414 patlen = strlen(revision); 415 if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen])) 416 return true; 417 for (s = string; *s; s++) { 418 if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) && 419 isspace((unsigned char)s[patlen + 1])) { 420 return true; 421 } 422 } 423 return false; 424 } 425