| File: | src/usr.bin/vi/build/../common/recover.c |
| Warning: | line 330, column 2 Value stored to 'gp' is never read |
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| 1 | /* $OpenBSD: recover.c,v 1.32 2022/02/20 19:45:51 tb Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1993, 1994 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * Copyright (c) 1993, 1994, 1995, 1996 |
| 7 | * Keith Bostic. All rights reserved. |
| 8 | * |
| 9 | * See the LICENSE file for redistribution information. |
| 10 | */ |
| 11 | |
| 12 | #include "config.h" |
| 13 | |
| 14 | #include <sys/queue.h> |
| 15 | #include <sys/stat.h> |
| 16 | #include <sys/time.h> |
| 17 | #include <sys/wait.h> |
| 18 | |
| 19 | /* |
| 20 | * We include <sys/file.h>, because the open #defines were found there |
| 21 | * on historical systems. We also include <fcntl.h> because the open(2) |
| 22 | * #defines are found there on newer systems. |
| 23 | */ |
| 24 | #include <sys/file.h> |
| 25 | |
| 26 | #include <bitstring.h> |
| 27 | #include <dirent.h> |
| 28 | #include <errno(*__errno()).h> |
| 29 | #include <fcntl.h> |
| 30 | #include <limits.h> |
| 31 | #include <paths.h> |
| 32 | #include <pwd.h> |
| 33 | #include <stdio.h> |
| 34 | #include <stdlib.h> |
| 35 | #include <string.h> |
| 36 | #include <time.h> |
| 37 | #include <unistd.h> |
| 38 | |
| 39 | #include "common.h" |
| 40 | |
| 41 | /* |
| 42 | * Recovery code. |
| 43 | * |
| 44 | * The basic scheme is as follows. In the EXF structure, we maintain full |
| 45 | * paths of a b+tree file and a mail recovery file. The former is the file |
| 46 | * used as backing store by the DB package. The latter is the file that |
| 47 | * contains an email message to be sent to the user if we crash. The two |
| 48 | * simple states of recovery are: |
| 49 | * |
| 50 | * + first starting the edit session: |
| 51 | * the b+tree file exists and is mode 700, the mail recovery |
| 52 | * file doesn't exist. |
| 53 | * + after the file has been modified: |
| 54 | * the b+tree file exists and is mode 600, the mail recovery |
| 55 | * file exists, and is exclusively locked. |
| 56 | * |
| 57 | * In the EXF structure we maintain a file descriptor that is the locked |
| 58 | * file descriptor for the mail recovery file. NOTE: we sometimes have to |
| 59 | * do locking with fcntl(2). This is a problem because if you close(2) any |
| 60 | * file descriptor associated with the file, ALL of the locks go away. Be |
| 61 | * sure to remember that if you have to modify the recovery code. (It has |
| 62 | * been rhetorically asked of what the designers could have been thinking |
| 63 | * when they did that interface. The answer is simple: they weren't.) |
| 64 | * |
| 65 | * To find out if a recovery file/backing file pair are in use, try to get |
| 66 | * a lock on the recovery file. |
| 67 | * |
| 68 | * To find out if a backing file can be deleted at boot time, check for an |
| 69 | * owner execute bit. (Yes, I know it's ugly, but it's either that or put |
| 70 | * special stuff into the backing file itself, or correlate the files at |
| 71 | * boot time, neither of which looks like fun.) Note also that there's a |
| 72 | * window between when the file is created and the X bit is set. It's small, |
| 73 | * but it's there. To fix the window, check for 0 length files as well. |
| 74 | * |
| 75 | * To find out if a file can be recovered, check the F_RCV_ON bit. Note, |
| 76 | * this DOES NOT mean that any initialization has been done, only that we |
| 77 | * haven't yet failed at setting up or doing recovery. |
| 78 | * |
| 79 | * To preserve a recovery file/backing file pair, set the F_RCV_NORM bit. |
| 80 | * If that bit is not set when ending a file session: |
| 81 | * If the EXF structure paths (rcv_path and rcv_mpath) are not NULL, |
| 82 | * they are unlink(2)'d, and free(3)'d. |
| 83 | * If the EXF file descriptor (rcv_fd) is not -1, it is closed. |
| 84 | * |
| 85 | * The backing b+tree file is set up when a file is first edited, so that |
| 86 | * the DB package can use it for on-disk caching and/or to snapshot the |
| 87 | * file. When the file is first modified, the mail recovery file is created, |
| 88 | * the backing file permissions are updated, the file is sync(2)'d to disk, |
| 89 | * and the timer is started. Then, at RCV_PERIOD second intervals, the |
| 90 | * b+tree file is synced to disk. RCV_PERIOD is measured using SIGALRM, which |
| 91 | * means that the data structures (SCR, EXF, the underlying tree structures) |
| 92 | * must be consistent when the signal arrives. |
| 93 | * |
| 94 | * The recovery mail file contains normal mail headers, with two additions, |
| 95 | * which occur in THIS order, as the FIRST TWO headers: |
| 96 | * |
| 97 | * X-vi-recover-file: file_name |
| 98 | * X-vi-recover-path: recover_path |
| 99 | * |
| 100 | * Since newlines delimit the headers, this means that file names cannot have |
| 101 | * newlines in them, but that's probably okay. As these files aren't intended |
| 102 | * to be long-lived, changing their format won't be too painful. |
| 103 | * |
| 104 | * Btree files are named "vi.XXXX" and recovery files are named "recover.XXXX". |
| 105 | */ |
| 106 | |
| 107 | #define VI_FHEADER"X-vi-recover-file: " "X-vi-recover-file: " |
| 108 | #define VI_PHEADER"X-vi-recover-path: " "X-vi-recover-path: " |
| 109 | |
| 110 | static int rcv_copy(SCR *, int, char *); |
| 111 | static void rcv_email(SCR *, int); |
| 112 | static char *rcv_gets(char *, size_t, int); |
| 113 | static int rcv_mailfile(SCR *, int, char *); |
| 114 | static int rcv_mktemp(SCR *, char *, char *, int); |
| 115 | static int rcv_openat(SCR *, int, const char *, int *); |
| 116 | |
| 117 | /* |
| 118 | * rcv_tmp -- |
| 119 | * Build a file name that will be used as the recovery file. |
| 120 | * |
| 121 | * PUBLIC: int rcv_tmp(SCR *, EXF *, char *); |
| 122 | */ |
| 123 | int |
| 124 | rcv_tmp(SCR *sp, EXF *ep, char *name) |
| 125 | { |
| 126 | struct stat sb; |
| 127 | static int warned = 0; |
| 128 | int fd; |
| 129 | char *dp, *p, path[PATH_MAX1024]; |
| 130 | |
| 131 | /* |
| 132 | * !!! |
| 133 | * ep MAY NOT BE THE SAME AS sp->ep, DON'T USE THE LATTER. |
| 134 | */ |
| 135 | if (opts_empty(sp, O_RECDIR, 0)) |
| 136 | goto err; |
| 137 | dp = O_STR(sp, O_RECDIR)((((&((sp))->opts[((O_RECDIR))])->flags) & ((0x01 ))) ? ((sp))->gp->opts[((sp))->opts[((O_RECDIR))].o_cur .val].o_cur.str : ((sp))->opts[((O_RECDIR))].o_cur.str); |
| 138 | if (stat(dp, &sb)) { |
| 139 | if (!warned) { |
| 140 | warned = 1; |
| 141 | msgq(sp, M_SYSERR, "%s", dp); |
| 142 | goto err; |
| 143 | } |
| 144 | return 1; |
| 145 | } |
| 146 | |
| 147 | /* Newlines delimit the mail messages. */ |
| 148 | for (p = name; *p; ++p) |
| 149 | if (*p == '\n') { |
| 150 | msgq(sp, M_ERR, |
| 151 | "Files with newlines in the name are unrecoverable"); |
| 152 | goto err; |
| 153 | } |
| 154 | |
| 155 | (void)snprintf(path, sizeof(path), "%s/vi.XXXXXXXXXX", dp); |
| 156 | if ((fd = rcv_mktemp(sp, path, dp, S_IRWXU0000700)) == -1) |
| 157 | goto err; |
| 158 | (void)close(fd); |
| 159 | |
| 160 | if ((ep->rcv_path = strdup(path)) == NULL((void *)0)) { |
| 161 | msgq(sp, M_SYSERR, NULL((void *)0)); |
| 162 | (void)unlink(path); |
| 163 | err: msgq(sp, M_ERR, |
| 164 | "Modifications not recoverable if the session fails"); |
| 165 | return (1); |
| 166 | } |
| 167 | |
| 168 | /* We believe the file is recoverable. */ |
| 169 | F_SET(ep, F_RCV_ON)(((ep)->flags) |= ((0x040))); |
| 170 | return (0); |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * rcv_init -- |
| 175 | * Force the file to be snapshotted for recovery. |
| 176 | * |
| 177 | * PUBLIC: int rcv_init(SCR *); |
| 178 | */ |
| 179 | int |
| 180 | rcv_init(SCR *sp) |
| 181 | { |
| 182 | EXF *ep; |
| 183 | recno_t lno; |
| 184 | |
| 185 | ep = sp->ep; |
| 186 | |
| 187 | /* Only do this once. */ |
| 188 | F_CLR(ep, F_FIRSTMODIFY)(((ep)->flags) &= ~((0x002))); |
| 189 | |
| 190 | /* If we already know the file isn't recoverable, we're done. */ |
| 191 | if (!F_ISSET(ep, F_RCV_ON)(((ep)->flags) & ((0x040)))) |
| 192 | return (0); |
| 193 | |
| 194 | /* Turn off recoverability until we figure out if this will work. */ |
| 195 | F_CLR(ep, F_RCV_ON)(((ep)->flags) &= ~((0x040))); |
| 196 | |
| 197 | /* Test if we're recovering a file, not editing one. */ |
| 198 | if (ep->rcv_mpath == NULL((void *)0)) { |
| 199 | /* Build a file to mail to the user. */ |
| 200 | if (rcv_mailfile(sp, 0, NULL((void *)0))) |
| 201 | goto err; |
| 202 | |
| 203 | /* Force a read of the entire file. */ |
| 204 | if (db_last(sp, &lno)) |
| 205 | goto err; |
| 206 | |
| 207 | /* Turn on a busy message, and sync it to backing store. */ |
| 208 | sp->gp->scr_busy(sp, |
| 209 | "Copying file for recovery...", BUSY_ON); |
| 210 | if (ep->db->sync(ep->db, R_RECNOSYNC11)) { |
| 211 | msgq_str(sp, M_SYSERR, ep->rcv_path, |
| 212 | "Preservation failed: %s"); |
| 213 | sp->gp->scr_busy(sp, NULL((void *)0), BUSY_OFF); |
| 214 | goto err; |
| 215 | } |
| 216 | sp->gp->scr_busy(sp, NULL((void *)0), BUSY_OFF); |
| 217 | } |
| 218 | |
| 219 | /* Turn off the owner execute bit. */ |
| 220 | (void)chmod(ep->rcv_path, S_IRUSR0000400 | S_IWUSR0000200); |
| 221 | |
| 222 | /* We believe the file is recoverable. */ |
| 223 | F_SET(ep, F_RCV_ON)(((ep)->flags) |= ((0x040))); |
| 224 | return (0); |
| 225 | |
| 226 | err: msgq(sp, M_ERR, |
| 227 | "Modifications not recoverable if the session fails"); |
| 228 | return (1); |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * rcv_sync -- |
| 233 | * Sync the file, optionally: |
| 234 | * flagging the backup file to be preserved |
| 235 | * snapshotting the backup file and send email to the user |
| 236 | * sending email to the user if the file was modified |
| 237 | * ending the file session |
| 238 | * |
| 239 | * PUBLIC: int rcv_sync(SCR *, u_int); |
| 240 | */ |
| 241 | int |
| 242 | rcv_sync(SCR *sp, u_int flags) |
| 243 | { |
| 244 | EXF *ep; |
| 245 | int fd, rval; |
| 246 | char *dp, buf[1024]; |
| 247 | |
| 248 | /* Make sure that there's something to recover/sync. */ |
| 249 | ep = sp->ep; |
| 250 | if (ep == NULL((void *)0) || !F_ISSET(ep, F_RCV_ON)(((ep)->flags) & ((0x040)))) |
| 251 | return (0); |
| 252 | |
| 253 | /* Sync the file if it's been modified. */ |
| 254 | if (F_ISSET(ep, F_MODIFIED)(((ep)->flags) & ((0x004)))) { |
| 255 | /* Clear recovery sync flag. */ |
| 256 | F_CLR(ep, F_RCV_SYNC)(((ep)->flags) &= ~((0x100))); |
| 257 | if (ep->db->sync(ep->db, R_RECNOSYNC11)) { |
| 258 | F_CLR(ep, F_RCV_ON | F_RCV_NORM)(((ep)->flags) &= ~((0x040 | 0x020))); |
| 259 | msgq_str(sp, M_SYSERR, |
| 260 | ep->rcv_path, "File backup failed: %s"); |
| 261 | return (1); |
| 262 | } |
| 263 | |
| 264 | /* REQUEST: don't remove backing file on exit. */ |
| 265 | if (LF_ISSET(RCV_PRESERVE)((flags) & ((0x04)))) |
| 266 | F_SET(ep, F_RCV_NORM)(((ep)->flags) |= ((0x020))); |
| 267 | |
| 268 | /* REQUEST: send email. */ |
| 269 | if (LF_ISSET(RCV_EMAIL)((flags) & ((0x01)))) |
| 270 | rcv_email(sp, ep->rcv_fd); |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * !!! |
| 275 | * Each time the user exec's :preserve, we have to snapshot all of |
| 276 | * the recovery information, i.e. it's like the user re-edited the |
| 277 | * file. We copy the DB(3) backing file, and then create a new mail |
| 278 | * recovery file, it's simpler than exiting and reopening all of the |
| 279 | * underlying files. |
| 280 | * |
| 281 | * REQUEST: snapshot the file. |
| 282 | */ |
| 283 | rval = 0; |
| 284 | if (LF_ISSET(RCV_SNAPSHOT)((flags) & ((0x08)))) { |
| 285 | if (opts_empty(sp, O_RECDIR, 0)) |
| 286 | goto err; |
| 287 | dp = O_STR(sp, O_RECDIR)((((&((sp))->opts[((O_RECDIR))])->flags) & ((0x01 ))) ? ((sp))->gp->opts[((sp))->opts[((O_RECDIR))].o_cur .val].o_cur.str : ((sp))->opts[((O_RECDIR))].o_cur.str); |
| 288 | (void)snprintf(buf, sizeof(buf), "%s/vi.XXXXXXXXXX", dp); |
| 289 | if ((fd = rcv_mktemp(sp, buf, dp, S_IRUSR0000400 | S_IWUSR0000200)) == -1) |
| 290 | goto err; |
| 291 | sp->gp->scr_busy(sp, |
| 292 | "Copying file for recovery...", BUSY_ON); |
| 293 | if (rcv_copy(sp, fd, ep->rcv_path) || |
| 294 | close(fd) || rcv_mailfile(sp, 1, buf)) { |
| 295 | (void)unlink(buf); |
| 296 | (void)close(fd); |
| 297 | rval = 1; |
| 298 | } |
| 299 | sp->gp->scr_busy(sp, NULL((void *)0), BUSY_OFF); |
| 300 | } |
| 301 | if (0) { |
| 302 | err: rval = 1; |
| 303 | } |
| 304 | |
| 305 | /* REQUEST: end the file session. */ |
| 306 | if (LF_ISSET(RCV_ENDSESSION)((flags) & ((0x02)))) |
| 307 | F_SET(sp, SC_EXIT_FORCE)(((sp)->flags) |= ((0x00000400))); |
| 308 | |
| 309 | return (rval); |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * rcv_mailfile -- |
| 314 | * Build the file to mail to the user. |
| 315 | */ |
| 316 | static int |
| 317 | rcv_mailfile(SCR *sp, int issync, char *cp_path) |
| 318 | { |
| 319 | EXF *ep; |
| 320 | GS *gp; |
| 321 | struct passwd *pw; |
| 322 | size_t len; |
| 323 | time_t now; |
| 324 | uid_t uid; |
| 325 | int fd; |
| 326 | char *dp, *p, *t, buf[4096], mpath[PATH_MAX1024]; |
| 327 | char *t1, *t2, *t3; |
| 328 | char host[HOST_NAME_MAX255+1]; |
| 329 | |
| 330 | gp = sp->gp; |
Value stored to 'gp' is never read | |
| 331 | if ((pw = getpwuid(uid = getuid())) == NULL((void *)0)) { |
| 332 | msgq(sp, M_ERR, |
| 333 | "Information on user id %u not found", uid); |
| 334 | return (1); |
| 335 | } |
| 336 | |
| 337 | if (opts_empty(sp, O_RECDIR, 0)) |
| 338 | return (1); |
| 339 | dp = O_STR(sp, O_RECDIR)((((&((sp))->opts[((O_RECDIR))])->flags) & ((0x01 ))) ? ((sp))->gp->opts[((sp))->opts[((O_RECDIR))].o_cur .val].o_cur.str : ((sp))->opts[((O_RECDIR))].o_cur.str); |
| 340 | (void)snprintf(mpath, sizeof(mpath), "%s/recover.XXXXXXXXXX", dp); |
| 341 | if ((fd = rcv_mktemp(sp, mpath, dp, S_IRUSR0000400 | S_IWUSR0000200)) == -1) |
| 342 | return (1); |
| 343 | |
| 344 | /* |
| 345 | * XXX |
| 346 | * We keep an open lock on the file so that the recover option can |
| 347 | * distinguish between files that are live and those that need to |
| 348 | * be recovered. There's an obvious window between the mkstemp call |
| 349 | * and the lock, but it's pretty small. |
| 350 | */ |
| 351 | ep = sp->ep; |
| 352 | if (file_lock(sp, NULL((void *)0), NULL((void *)0), fd, 1) != LOCK_SUCCESS) |
| 353 | msgq(sp, M_SYSERR, "Unable to lock recovery file"); |
| 354 | if (!issync) { |
| 355 | /* Save the recover file descriptor, and mail path. */ |
| 356 | ep->rcv_fd = fd; |
| 357 | if ((ep->rcv_mpath = strdup(mpath)) == NULL((void *)0)) { |
| 358 | msgq(sp, M_SYSERR, NULL((void *)0)); |
| 359 | goto err; |
| 360 | } |
| 361 | cp_path = ep->rcv_path; |
| 362 | } |
| 363 | |
| 364 | /* |
| 365 | * XXX |
| 366 | * We can't use stdio(3) here. The problem is that we may be using |
| 367 | * fcntl(2), so if ANY file descriptor into the file is closed, the |
| 368 | * lock is lost. So, we could never close the FILE *, even if we |
| 369 | * dup'd the fd first. |
| 370 | */ |
| 371 | t = sp->frp->name; |
| 372 | if ((p = strrchr(t, '/')) == NULL((void *)0)) |
| 373 | p = t; |
| 374 | else |
| 375 | ++p; |
| 376 | (void)time(&now); |
| 377 | (void)gethostname(host, sizeof(host)); |
| 378 | len = snprintf(buf, sizeof(buf), |
| 379 | "%s%s\n%s%s\n%s\n%s\n%s%s\n%s%s\n%s\n%s\n\n", |
| 380 | VI_FHEADER"X-vi-recover-file: ", t, /* Non-standard. */ |
| 381 | VI_PHEADER"X-vi-recover-path: ", cp_path, /* Non-standard. */ |
| 382 | "Reply-To: root", |
| 383 | "From: root (Nvi recovery program)", |
| 384 | "To: ", pw->pw_name, |
| 385 | "Subject: Nvi saved the file ", p, |
| 386 | "Precedence: bulk", /* For vacation(1). */ |
| 387 | "Auto-Submitted: auto-generated"); |
| 388 | if (len > sizeof(buf) - 1) |
| 389 | goto lerr; |
| 390 | if (write(fd, buf, len) != len) |
| 391 | goto werr; |
| 392 | |
| 393 | len = snprintf(buf, sizeof(buf), |
| 394 | "%s%.24s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n\n", |
| 395 | "On ", ctime(&now), ", the user ", pw->pw_name, |
| 396 | " was editing a file named ", t, " on the machine ", |
| 397 | host, ", when it was saved for recovery. ", |
| 398 | "You can recover most, if not all, of the changes ", |
| 399 | "to this file using the -r option to ", getprogname(), ":\n\n\t", |
| 400 | getprogname(), " -r ", t); |
| 401 | if (len > sizeof(buf) - 1) { |
| 402 | lerr: msgq(sp, M_ERR, "Recovery file buffer overrun"); |
| 403 | goto err; |
| 404 | } |
| 405 | |
| 406 | /* |
| 407 | * Format the message. (Yes, I know it's silly.) |
| 408 | * Requires that the message end in a <newline>. |
| 409 | */ |
| 410 | #define FMTCOLS60 60 |
| 411 | for (t1 = buf; len > 0; len -= t2 - t1, t1 = t2) { |
| 412 | /* Check for a short length. */ |
| 413 | if (len <= FMTCOLS60) { |
| 414 | t2 = t1 + (len - 1); |
| 415 | goto wout; |
| 416 | } |
| 417 | |
| 418 | /* Check for a required <newline>. */ |
| 419 | t2 = strchr(t1, '\n'); |
| 420 | if (t2 - t1 <= FMTCOLS60) |
| 421 | goto wout; |
| 422 | |
| 423 | /* Find the closest space, if any. */ |
| 424 | for (t3 = t2; t2 > t1; --t2) |
| 425 | if (*t2 == ' ') { |
| 426 | if (t2 - t1 <= FMTCOLS60) |
| 427 | goto wout; |
| 428 | t3 = t2; |
| 429 | } |
| 430 | t2 = t3; |
| 431 | |
| 432 | /* t2 points to the last character to display. */ |
| 433 | wout: *t2++ = '\n'; |
| 434 | |
| 435 | /* t2 points one after the last character to display. */ |
| 436 | if (write(fd, t1, t2 - t1) != t2 - t1) |
| 437 | goto werr; |
| 438 | } |
| 439 | |
| 440 | if (issync) { |
| 441 | rcv_email(sp, fd); |
| 442 | if (close(fd)) { |
| 443 | werr: msgq(sp, M_SYSERR, "Recovery file"); |
| 444 | goto err; |
| 445 | } |
| 446 | } |
| 447 | return (0); |
| 448 | |
| 449 | err: if (!issync) |
| 450 | ep->rcv_fd = -1; |
| 451 | if (fd != -1) |
| 452 | (void)close(fd); |
| 453 | return (1); |
| 454 | } |
| 455 | |
| 456 | /* |
| 457 | * rcv_openat -- |
| 458 | * Open a recovery file in the specified dir and lock it. |
| 459 | * |
| 460 | * PUBLIC: int rcv_openat(SCR *, int, const char *, int *) |
| 461 | */ |
| 462 | static int |
| 463 | rcv_openat(SCR *sp, int dfd, const char *name, int *locked) |
| 464 | { |
| 465 | struct stat sb; |
| 466 | int fd, dummy; |
| 467 | |
| 468 | /* |
| 469 | * If it's readable, it's recoverable. |
| 470 | * Note: file_lock() sets the close on exec flag for us. |
| 471 | */ |
| 472 | fd = openat(dfd, name, O_RDONLY0x0000|O_NOFOLLOW0x0100|O_NONBLOCK0x0004); |
| 473 | if (fd == -1) |
| 474 | goto bad; |
| 475 | |
| 476 | /* |
| 477 | * Real vi recovery files are created with mode 0600. |
| 478 | * If not a regular file or the mode has changed, skip it. |
| 479 | */ |
| 480 | if (fstat(fd, &sb) == -1 || !S_ISREG(sb.st_mode)((sb.st_mode & 0170000) == 0100000) || |
| 481 | (sb.st_mode & ALLPERMS(0004000|0002000|0001000|0000700|0000070|0000007)) != (S_IRUSR0000400 | S_IWUSR0000200)) |
| 482 | goto bad; |
| 483 | |
| 484 | if (locked == NULL((void *)0)) |
| 485 | locked = &dummy; |
| 486 | switch ((*locked = file_lock(sp, NULL((void *)0), NULL((void *)0), fd, 0))) { |
| 487 | case LOCK_FAILED: |
| 488 | /* |
| 489 | * XXX |
| 490 | * Assume that a lock can't be acquired, but that we |
| 491 | * should permit recovery anyway. If this is wrong, |
| 492 | * and someone else is using the file, we're going to |
| 493 | * die horribly. |
| 494 | */ |
| 495 | break; |
| 496 | case LOCK_SUCCESS: |
| 497 | break; |
| 498 | case LOCK_UNAVAIL: |
| 499 | /* If it's locked, it's live. */ |
| 500 | goto bad; |
| 501 | } |
| 502 | return fd; |
| 503 | bad: |
| 504 | if (fd != -1) |
| 505 | close(fd); |
| 506 | return -1; |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * people making love |
| 511 | * never exactly the same |
| 512 | * just like a snowflake |
| 513 | * |
| 514 | * rcv_list -- |
| 515 | * List the files that can be recovered by this user. |
| 516 | * |
| 517 | * PUBLIC: int rcv_list(SCR *); |
| 518 | */ |
| 519 | int |
| 520 | rcv_list(SCR *sp) |
| 521 | { |
| 522 | struct dirent *dp; |
| 523 | struct stat sb; |
| 524 | DIR *dirp; |
| 525 | int fd; |
| 526 | FILE *fp; |
| 527 | int found; |
| 528 | char *p, *t, file[PATH_MAX1024], path[PATH_MAX1024]; |
| 529 | |
| 530 | /* Open the recovery directory for reading. */ |
| 531 | if (opts_empty(sp, O_RECDIR, 0)) |
| 532 | return (1); |
| 533 | p = O_STR(sp, O_RECDIR)((((&((sp))->opts[((O_RECDIR))])->flags) & ((0x01 ))) ? ((sp))->gp->opts[((sp))->opts[((O_RECDIR))].o_cur .val].o_cur.str : ((sp))->opts[((O_RECDIR))].o_cur.str); |
| 534 | if ((dirp = opendir(p)) == NULL((void *)0)) { |
| 535 | msgq_str(sp, M_SYSERR, p, "recdir: %s"); |
| 536 | return (1); |
| 537 | } |
| 538 | |
| 539 | /* Read the directory. */ |
| 540 | for (found = 0; (dp = readdir(dirp)) != NULL((void *)0);) { |
| 541 | if (strncmp(dp->d_name, "recover.", 8)) |
| 542 | continue; |
| 543 | |
| 544 | if ((fd = rcv_openat(sp, dirfd(dirp), dp->d_name, NULL((void *)0))) == -1) |
| 545 | continue; |
| 546 | |
| 547 | /* Check the headers. */ |
| 548 | if ((fp = fdopen(fd, "r")) == NULL((void *)0)) { |
| 549 | close(fd); |
| 550 | continue; |
| 551 | } |
| 552 | if (fgets(file, sizeof(file), fp) == NULL((void *)0) || |
| 553 | strncmp(file, VI_FHEADER"X-vi-recover-file: ", sizeof(VI_FHEADER"X-vi-recover-file: ") - 1) || |
| 554 | (p = strchr(file, '\n')) == NULL((void *)0) || |
| 555 | fgets(path, sizeof(path), fp) == NULL((void *)0) || |
| 556 | strncmp(path, VI_PHEADER"X-vi-recover-path: ", sizeof(VI_PHEADER"X-vi-recover-path: ") - 1) || |
| 557 | (t = strchr(path, '\n')) == NULL((void *)0)) { |
| 558 | msgq_str(sp, M_ERR, dp->d_name, |
| 559 | "%s: malformed recovery file"); |
| 560 | goto next; |
| 561 | } |
| 562 | *p = *t = '\0'; |
| 563 | |
| 564 | /* |
| 565 | * If the file doesn't exist, it's an orphaned recovery file, |
| 566 | * toss it. |
| 567 | * |
| 568 | * XXX |
| 569 | * This can occur if the backup file was deleted and we crashed |
| 570 | * before deleting the email file. |
| 571 | */ |
| 572 | errno(*__errno()) = 0; |
| 573 | if (stat(path + sizeof(VI_PHEADER"X-vi-recover-path: ") - 1, &sb) && |
| 574 | errno(*__errno()) == ENOENT2) { |
| 575 | (void)unlinkat(dirfd(dirp), dp->d_name, 0); |
| 576 | goto next; |
| 577 | } |
| 578 | |
| 579 | /* Get the last modification time and display. */ |
| 580 | (void)fstat(fd, &sb); |
| 581 | (void)printf("%.24s: %s\n", |
| 582 | ctime(&sb.st_mtimest_mtim.tv_sec), file + sizeof(VI_FHEADER"X-vi-recover-file: ") - 1); |
| 583 | found = 1; |
| 584 | |
| 585 | /* Close, discarding lock. */ |
| 586 | next: (void)fclose(fp); |
| 587 | } |
| 588 | if (found == 0) |
| 589 | (void)printf("%s: No files to recover\n", getprogname()); |
| 590 | (void)closedir(dirp); |
| 591 | return (0); |
| 592 | } |
| 593 | |
| 594 | /* |
| 595 | * rcv_read -- |
| 596 | * Start a recovered file as the file to edit. |
| 597 | * |
| 598 | * PUBLIC: int rcv_read(SCR *, FREF *); |
| 599 | */ |
| 600 | int |
| 601 | rcv_read(SCR *sp, FREF *frp) |
| 602 | { |
| 603 | struct dirent *dp; |
| 604 | struct stat sb; |
| 605 | DIR *dirp; |
| 606 | EXF *ep; |
| 607 | struct timespec rec_mtim; |
| 608 | int fd, found, lck, requested, sv_fd; |
| 609 | char *name, *p, *t, *rp, *recp, *pathp; |
| 610 | char file[PATH_MAX1024], path[PATH_MAX1024], recpath[PATH_MAX1024]; |
| 611 | |
| 612 | if (opts_empty(sp, O_RECDIR, 0)) |
| 613 | return (1); |
| 614 | rp = O_STR(sp, O_RECDIR)((((&((sp))->opts[((O_RECDIR))])->flags) & ((0x01 ))) ? ((sp))->gp->opts[((sp))->opts[((O_RECDIR))].o_cur .val].o_cur.str : ((sp))->opts[((O_RECDIR))].o_cur.str); |
| 615 | if ((dirp = opendir(rp)) == NULL((void *)0)) { |
| 616 | msgq_str(sp, M_SYSERR, rp, "%s"); |
| 617 | return (1); |
| 618 | } |
| 619 | |
| 620 | name = frp->name; |
| 621 | sv_fd = -1; |
| 622 | rec_mtim.tv_sec = rec_mtim.tv_nsec = 0; |
| 623 | recp = pathp = NULL((void *)0); |
| 624 | for (found = requested = 0; (dp = readdir(dirp)) != NULL((void *)0);) { |
| 625 | if (strncmp(dp->d_name, "recover.", 8)) |
| 626 | continue; |
| 627 | if ((size_t)snprintf(recpath, sizeof(recpath), "%s/%s", |
| 628 | rp, dp->d_name) >= sizeof(recpath)) |
| 629 | continue; |
| 630 | |
| 631 | if ((fd = rcv_openat(sp, dirfd(dirp), dp->d_name, &lck)) == -1) |
| 632 | continue; |
| 633 | |
| 634 | /* Check the headers. */ |
| 635 | if (rcv_gets(file, sizeof(file), fd) == NULL((void *)0) || |
| 636 | strncmp(file, VI_FHEADER"X-vi-recover-file: ", sizeof(VI_FHEADER"X-vi-recover-file: ") - 1) || |
| 637 | (p = strchr(file, '\n')) == NULL((void *)0) || |
| 638 | rcv_gets(path, sizeof(path), fd) == NULL((void *)0) || |
| 639 | strncmp(path, VI_PHEADER"X-vi-recover-path: ", sizeof(VI_PHEADER"X-vi-recover-path: ") - 1) || |
| 640 | (t = strchr(path, '\n')) == NULL((void *)0)) { |
| 641 | msgq_str(sp, M_ERR, recpath, |
| 642 | "%s: malformed recovery file"); |
| 643 | goto next; |
| 644 | } |
| 645 | *p = *t = '\0'; |
| 646 | ++found; |
| 647 | |
| 648 | /* |
| 649 | * If the file doesn't exist, it's an orphaned recovery file, |
| 650 | * toss it. |
| 651 | * |
| 652 | * XXX |
| 653 | * This can occur if the backup file was deleted and we crashed |
| 654 | * before deleting the email file. |
| 655 | */ |
| 656 | errno(*__errno()) = 0; |
| 657 | if (stat(path + sizeof(VI_PHEADER"X-vi-recover-path: ") - 1, &sb) && |
| 658 | errno(*__errno()) == ENOENT2) { |
| 659 | (void)unlink(dp->d_name); |
| 660 | goto next; |
| 661 | } |
| 662 | |
| 663 | /* Check the file name. */ |
| 664 | if (strcmp(file + sizeof(VI_FHEADER"X-vi-recover-file: ") - 1, name)) |
| 665 | goto next; |
| 666 | |
| 667 | ++requested; |
| 668 | |
| 669 | /* |
| 670 | * If we've found more than one, take the most recent. |
| 671 | */ |
| 672 | (void)fstat(fd, &sb); |
| 673 | if (recp == NULL((void *)0) || |
| 674 | timespeccmp(&rec_mtim, &sb.st_mtim, <)(((&rec_mtim)->tv_sec == (&sb.st_mtim)->tv_sec) ? ((&rec_mtim)->tv_nsec < (&sb.st_mtim)->tv_nsec ) : ((&rec_mtim)->tv_sec < (&sb.st_mtim)->tv_sec ))) { |
| 675 | p = recp; |
| 676 | t = pathp; |
| 677 | if ((recp = strdup(recpath)) == NULL((void *)0)) { |
| 678 | msgq(sp, M_SYSERR, NULL((void *)0)); |
| 679 | recp = p; |
| 680 | goto next; |
| 681 | } |
| 682 | if ((pathp = strdup(path)) == NULL((void *)0)) { |
| 683 | msgq(sp, M_SYSERR, NULL((void *)0)); |
| 684 | free(recp); |
| 685 | recp = p; |
| 686 | pathp = t; |
| 687 | goto next; |
| 688 | } |
| 689 | if (p != NULL((void *)0)) { |
| 690 | free(p); |
| 691 | free(t); |
| 692 | } |
| 693 | rec_mtim = sb.st_mtim; |
| 694 | if (sv_fd != -1) |
| 695 | (void)close(sv_fd); |
| 696 | sv_fd = fd; |
| 697 | } else |
| 698 | next: (void)close(fd); |
| 699 | } |
| 700 | (void)closedir(dirp); |
| 701 | |
| 702 | if (recp == NULL((void *)0)) { |
| 703 | msgq_str(sp, M_INFO, name, |
| 704 | "No files named %s, readable by you, to recover"); |
| 705 | return (1); |
| 706 | } |
| 707 | if (found) { |
| 708 | if (requested > 1) |
| 709 | msgq(sp, M_INFO, |
| 710 | "There are older versions of this file for you to recover"); |
| 711 | if (found > requested) |
| 712 | msgq(sp, M_INFO, |
| 713 | "There are other files for you to recover"); |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * Create the FREF structure, start the btree file. |
| 718 | * |
| 719 | * XXX |
| 720 | * file_init() is going to set ep->rcv_path. |
| 721 | */ |
| 722 | if (file_init(sp, frp, pathp + sizeof(VI_PHEADER"X-vi-recover-path: ") - 1, 0)) { |
| 723 | free(recp); |
| 724 | free(pathp); |
| 725 | (void)close(sv_fd); |
| 726 | return (1); |
| 727 | } |
| 728 | |
| 729 | /* |
| 730 | * We keep an open lock on the file so that the recover option can |
| 731 | * distinguish between files that are live and those that need to |
| 732 | * be recovered. The lock is already acquired, just copy it. |
| 733 | */ |
| 734 | ep = sp->ep; |
| 735 | ep->rcv_mpath = recp; |
| 736 | ep->rcv_fd = sv_fd; |
| 737 | if (lck != LOCK_SUCCESS) |
| 738 | F_SET(frp, FR_UNLOCKED)(((frp)->flags) |= ((0x0100))); |
| 739 | |
| 740 | /* We believe the file is recoverable. */ |
| 741 | F_SET(ep, F_RCV_ON)(((ep)->flags) |= ((0x040))); |
| 742 | return (0); |
| 743 | } |
| 744 | |
| 745 | /* |
| 746 | * rcv_copy -- |
| 747 | * Copy a recovery file. |
| 748 | */ |
| 749 | static int |
| 750 | rcv_copy(SCR *sp, int wfd, char *fname) |
| 751 | { |
| 752 | int nr, nw, off, rfd; |
| 753 | char buf[8 * 1024]; |
| 754 | |
| 755 | if ((rfd = open(fname, O_RDONLY0x0000)) == -1) |
| 756 | goto err; |
| 757 | while ((nr = read(rfd, buf, sizeof(buf))) > 0) |
| 758 | for (off = 0; nr; nr -= nw, off += nw) |
| 759 | if ((nw = write(wfd, buf + off, nr)) < 0) |
| 760 | goto err; |
| 761 | if (nr == 0) |
| 762 | return (0); |
| 763 | |
| 764 | err: msgq_str(sp, M_SYSERR, fname, "%s"); |
| 765 | return (1); |
| 766 | } |
| 767 | |
| 768 | /* |
| 769 | * rcv_gets -- |
| 770 | * Fgets(3) for a file descriptor. |
| 771 | */ |
| 772 | static char * |
| 773 | rcv_gets(char *buf, size_t len, int fd) |
| 774 | { |
| 775 | int nr; |
| 776 | char *p; |
| 777 | |
| 778 | if ((nr = read(fd, buf, len - 1)) == -1) |
| 779 | return (NULL((void *)0)); |
| 780 | buf[nr] = '\0'; |
| 781 | if ((p = strchr(buf, '\n')) == NULL((void *)0)) |
| 782 | return (NULL((void *)0)); |
| 783 | (void)lseek(fd, (off_t)((p - buf) + 1), SEEK_SET0); |
| 784 | return (buf); |
| 785 | } |
| 786 | |
| 787 | /* |
| 788 | * rcv_mktemp -- |
| 789 | * Paranoid make temporary file routine. |
| 790 | */ |
| 791 | static int |
| 792 | rcv_mktemp(SCR *sp, char *path, char *dname, int perms) |
| 793 | { |
| 794 | int fd; |
| 795 | |
| 796 | /* |
| 797 | * !!! |
| 798 | * We expect mkstemp(3) to set the permissions correctly. On |
| 799 | * historic System V systems, mkstemp didn't. Do it here, on |
| 800 | * GP's. This also protects us from users with stupid umasks. |
| 801 | * |
| 802 | * XXX |
| 803 | * The variable perms should really be a mode_t. |
| 804 | */ |
| 805 | if ((fd = mkstemp(path)) == -1 || fchmod(fd, perms) == -1) { |
| 806 | msgq_str(sp, M_SYSERR, dname, "%s"); |
| 807 | if (fd != -1) { |
| 808 | close(fd); |
| 809 | unlink(path); |
| 810 | fd = -1; |
| 811 | } |
| 812 | } |
| 813 | return (fd); |
| 814 | } |
| 815 | |
| 816 | /* |
| 817 | * rcv_email -- |
| 818 | * Send email. |
| 819 | */ |
| 820 | static void |
| 821 | rcv_email(SCR *sp, int fd) |
| 822 | { |
| 823 | struct stat sb; |
| 824 | pid_t pid; |
| 825 | |
| 826 | /* |
| 827 | * In secure mode, our pledge(2) includes neither "proc" |
| 828 | * nor "exec". So simply skip sending the mail. |
| 829 | * Later vi -r still works because rcv_mailfile() |
| 830 | * already did all the necessary setup. |
| 831 | */ |
| 832 | if (O_ISSET(sp, O_SECURE)((((&(((sp)))->opts[(((O_SECURE)))])->flags) & ( (0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_SECURE )))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_SECURE)))] .o_cur.val)) |
| 833 | return; |
| 834 | |
| 835 | if (_PATH_SENDMAIL"/usr/sbin/sendmail"[0] != '/' || stat(_PATH_SENDMAIL"/usr/sbin/sendmail", &sb) == -1) |
| 836 | msgq_str(sp, M_SYSERR, |
| 837 | _PATH_SENDMAIL"/usr/sbin/sendmail", "not sending email: %s"); |
| 838 | else { |
| 839 | /* |
| 840 | * !!! |
| 841 | * If you need to port this to a system that doesn't have |
| 842 | * sendmail, the -t flag causes sendmail to read the message |
| 843 | * for the recipients instead of specifying them some other |
| 844 | * way. |
| 845 | */ |
| 846 | switch (pid = fork()) { |
| 847 | case -1: /* Error. */ |
| 848 | msgq(sp, M_SYSERR, "fork"); |
| 849 | break; |
| 850 | case 0: /* Sendmail. */ |
| 851 | if (lseek(fd, 0, SEEK_SET0) == -1) { |
| 852 | msgq(sp, M_SYSERR, "lseek"); |
| 853 | _exit(127); |
| 854 | } |
| 855 | if (fd != STDIN_FILENO0) { |
| 856 | if (dup2(fd, STDIN_FILENO0) == -1) { |
| 857 | msgq(sp, M_SYSERR, "dup2"); |
| 858 | _exit(127); |
| 859 | } |
| 860 | close(fd); |
| 861 | } |
| 862 | execl(_PATH_SENDMAIL"/usr/sbin/sendmail", "sendmail", "-t", (char *)NULL((void *)0)); |
| 863 | msgq(sp, M_SYSERR, _PATH_SENDMAIL"/usr/sbin/sendmail"); |
| 864 | _exit(127); |
| 865 | default: /* Parent. */ |
| 866 | while (waitpid(pid, NULL((void *)0), 0) == -1 && errno(*__errno()) == EINTR4) |
| 867 | continue; |
| 868 | break; |
| 869 | } |
| 870 | |
| 871 | } |
| 872 | } |