Annotation of src/usr.bin/mg/fileio.c, Revision 1.84
1.84 ! kjell 1: /* $OpenBSD: fileio.c,v 1.83 2011/01/21 18:58:55 kjell Exp $ */
1.50 kjell 2:
3: /* This file is in the public domain. */
1.10 niklas 4:
1.1 deraadt 5: /*
1.7 millert 6: * POSIX fileio.c
1.1 deraadt 7: */
1.49 db 8: #include "def.h"
1.56 deraadt 9:
1.82 kjell 10: #include <sys/types.h>
1.72 kjell 11: #include <sys/stat.h>
1.56 deraadt 12: #include <sys/time.h>
1.76 jason 13: #include <sys/resource.h>
1.53 kjell 14: #include <sys/wait.h>
1.72 kjell 15:
16: #include <fcntl.h>
1.33 vincent 17: #include <limits.h>
1.76 jason 18: #include <dirent.h>
1.72 kjell 19: #include <pwd.h>
1.21 vincent 20: #include <string.h>
1.9 millert 21: #include <unistd.h>
1.1 deraadt 22:
1.72 kjell 23: #include "kbd.h"
24:
1.49 db 25: static FILE *ffp;
26:
1.1 deraadt 27: /*
28: * Open a file for reading.
29: */
1.7 millert 30: int
1.62 deraadt 31: ffropen(const char *fn, struct buffer *bp)
1.7 millert 32: {
1.46 jfb 33: if ((ffp = fopen(fn, "r")) == NULL) {
34: if (errno == ENOENT)
35: return (FIOFNF);
36: return (FIOERR);
37: }
1.53 kjell 38:
39: /* If 'fn' is a directory open it with dired. */
1.54 kjell 40: if (fisdir(fn) == TRUE)
1.53 kjell 41: return (FIODIR);
42:
1.82 kjell 43: ffstat(bp);
44:
45: return (FIOSUC);
46: }
47:
48: /*
49: * Update stat/dirty info
50: */
51: void
52: ffstat(struct buffer *bp)
53: {
54: struct stat sb;
55:
56: if (bp && fstat(fileno(ffp), &sb) == 0) {
1.7 millert 57: /* set highorder bit to make sure this isn't all zero */
1.82 kjell 58: bp->b_fi.fi_mode = sb.st_mode | 0x8000;
59: bp->b_fi.fi_uid = sb.st_uid;
60: bp->b_fi.fi_gid = sb.st_gid;
61: bp->b_fi.fi_mtime = sb.st_mtimespec;
62: /* Clear the ignore flag */
63: bp->b_flag &= ~(BFIGNDIRTY | BFDIRTY);
1.1 deraadt 64: }
1.82 kjell 65: }
1.53 kjell 66:
1.82 kjell 67: /*
68: * Update the status/dirty info. If there is an error,
69: * there's not a lot we can do.
70: */
71: int
72: fupdstat(struct buffer *bp)
73: {
74: if ((ffp = fopen(bp->b_fname, "r")) == NULL) {
75: if (errno == ENOENT)
76: return (FIOFNF);
77: return (FIOERR);
78: }
79: ffstat(bp);
80: ffclose(bp);
1.1 deraadt 81: return (FIOSUC);
82: }
83:
84: /*
85: * Open a file for writing.
86: */
1.7 millert 87: int
1.62 deraadt 88: ffwopen(const char *fn, struct buffer *bp)
1.7 millert 89: {
1.49 db 90: int fd;
1.66 kjell 91: mode_t fmode = DEFFILEMODE;
1.7 millert 92:
1.24 deraadt 93: if (bp && bp->b_fi.fi_mode)
1.66 kjell 94: fmode = bp->b_fi.fi_mode & 07777;
1.24 deraadt 95:
1.66 kjell 96: fd = open(fn, O_RDWR | O_CREAT | O_TRUNC, fmode);
1.24 deraadt 97: if (fd == -1) {
98: ffp = NULL;
1.21 vincent 99: ewprintf("Cannot open file for writing : %s", strerror(errno));
1.1 deraadt 100: return (FIOERR);
1.34 deraadt 101: }
1.24 deraadt 102:
103: if ((ffp = fdopen(fd, "w")) == NULL) {
104: ewprintf("Cannot open file for writing : %s", strerror(errno));
105: close(fd);
1.34 deraadt 106: return (FIOERR);
1.1 deraadt 107: }
1.7 millert 108:
109: /*
110: * If we have file information, use it. We don't bother to check for
111: * errors, because there's no a lot we can do about it. Certainly
1.24 deraadt 112: * trying to change ownership will fail if we aren't root. That's
1.7 millert 113: * probably OK. If we don't have info, no need to get it, since any
114: * future writes will do the same thing.
1.1 deraadt 115: */
116: if (bp && bp->b_fi.fi_mode) {
1.28 deraadt 117: fchmod(fd, bp->b_fi.fi_mode & 07777);
118: fchown(fd, bp->b_fi.fi_uid, bp->b_fi.fi_gid);
1.1 deraadt 119: }
120: return (FIOSUC);
121: }
122:
123: /*
124: * Close a file.
1.7 millert 125: * XXX - Should look at the status.
1.1 deraadt 126: */
1.7 millert 127: /* ARGSUSED */
128: int
1.62 deraadt 129: ffclose(struct buffer *bp)
1.7 millert 130: {
1.13 art 131: (void) fclose(ffp);
1.1 deraadt 132: return (FIOSUC);
133: }
134:
135: /*
1.41 vincent 136: * Write a buffer to the already opened file. bp points to the
1.1 deraadt 137: * buffer. Return the status.
138: */
1.7 millert 139: int
1.62 deraadt 140: ffputbuf(struct buffer *bp)
1.1 deraadt 141: {
1.62 deraadt 142: struct line *lp, *lpend;
1.7 millert 143:
1.77 kjell 144: lpend = bp->b_headp;
1.41 vincent 145: for (lp = lforw(lpend); lp != lpend; lp = lforw(lp)) {
146: if (fwrite(ltext(lp), 1, llength(lp), ffp) != llength(lp)) {
147: ewprintf("Write I/O error");
1.49 db 148: return (FIOERR);
1.7 millert 149: }
1.41 vincent 150: if (lforw(lp) != lpend) /* no implied \n on last line */
151: putc('\n', ffp);
1.48 deraadt 152: }
1.42 vincent 153: /*
154: * XXX should be variable controlled (once we have variables)
155: */
156: if (llength(lback(lpend)) != 0) {
157: if (eyorn("No newline at end of file, add one") == TRUE) {
158: lnewline_at(lback(lpend), llength(lback(lpend)));
159: putc('\n', ffp);
160: }
161: }
1.7 millert 162: return (FIOSUC);
1.1 deraadt 163: }
164:
165: /*
166: * Read a line from a file, and store the bytes
167: * in the supplied buffer. Stop on end of file or end of
168: * line. When FIOEOF is returned, there is a valid line
169: * of data without the normally implied \n.
1.80 kjell 170: * If the line length exceeds nbuf, FIOLONG is returned.
1.1 deraadt 171: */
1.7 millert 172: int
1.25 vincent 173: ffgetline(char *buf, int nbuf, int *nbytes)
1.1 deraadt 174: {
1.16 mickey 175: int c, i;
1.1 deraadt 176:
177: i = 0;
1.7 millert 178: while ((c = getc(ffp)) != EOF && c != '\n') {
1.1 deraadt 179: buf[i++] = c;
1.7 millert 180: if (i >= nbuf)
1.49 db 181: return (FIOLONG);
1.1 deraadt 182: }
1.7 millert 183: if (c == EOF && ferror(ffp) != FALSE) {
1.1 deraadt 184: ewprintf("File read error");
1.49 db 185: return (FIOERR);
1.1 deraadt 186: }
187: *nbytes = i;
1.49 db 188: return (c == EOF ? FIOEOF : FIOSUC);
1.1 deraadt 189: }
190:
191: /*
1.9 millert 192: * Make a backup copy of "fname". On Unix the backup has the same
193: * name as the original file, with a "~" on the end; this seems to
194: * be newest of the new-speak. The error handling is all in "file.c".
195: * We do a copy instead of a rename since otherwise another process
196: * with an open fd will get the backup, not the new file. This is
197: * a problem when using mg with things like crontab and vipw.
1.1 deraadt 198: */
1.7 millert 199: int
1.25 vincent 200: fbackupfile(const char *fn)
1.7 millert 201: {
1.49 db 202: struct stat sb;
203: int from, to, serrno;
204: ssize_t nread;
205: char buf[BUFSIZ];
1.44 millert 206: char *nname, *tname;
1.1 deraadt 207:
1.35 vincent 208: if (stat(fn, &sb) == -1) {
209: ewprintf("Can't stat %s : %s", fn, strerror(errno));
210: return (FALSE);
211: }
212:
1.21 vincent 213: if (asprintf(&nname, "%s~", fn) == -1) {
1.44 millert 214: ewprintf("Can't allocate temp file name : %s", strerror(errno));
215: return (ABORT);
216: }
217:
218: if (asprintf(&tname, "%s.XXXXXXXXXX", fn) == -1) {
219: ewprintf("Can't allocate temp file name : %s", strerror(errno));
220: free(nname);
1.1 deraadt 221: return (ABORT);
1.9 millert 222: }
223:
1.21 vincent 224: if ((from = open(fn, O_RDONLY)) == -1) {
225: free(nname);
1.44 millert 226: free(tname);
1.1 deraadt 227: return (FALSE);
1.21 vincent 228: }
1.44 millert 229: to = mkstemp(tname);
1.9 millert 230: if (to == -1) {
231: serrno = errno;
232: close(from);
1.21 vincent 233: free(nname);
1.44 millert 234: free(tname);
1.9 millert 235: errno = serrno;
236: return (FALSE);
237: }
238: while ((nread = read(from, buf, sizeof(buf))) > 0) {
1.70 deraadt 239: if (write(to, buf, (size_t)nread) != nread) {
1.40 vincent 240: nread = -1;
241: break;
1.9 millert 242: }
1.1 deraadt 243: }
1.9 millert 244: serrno = errno;
1.44 millert 245: (void) fchmod(to, (sb.st_mode & 0777));
1.9 millert 246: close(from);
247: close(to);
1.21 vincent 248: if (nread == -1) {
1.44 millert 249: if (unlink(tname) == -1)
1.21 vincent 250: ewprintf("Can't unlink temp : %s", strerror(errno));
1.44 millert 251: } else {
252: if (rename(tname, nname) == -1) {
253: ewprintf("Can't rename temp : %s", strerror(errno));
254: (void) unlink(tname);
1.45 henning 255: nread = -1;
1.44 millert 256: }
1.21 vincent 257: }
1.1 deraadt 258: free(nname);
1.44 millert 259: free(tname);
1.9 millert 260: errno = serrno;
1.22 deraadt 261:
1.9 millert 262: return (nread == -1 ? FALSE : TRUE);
1.1 deraadt 263: }
264:
265: /*
1.73 kjell 266: * Convert "fn" to a canonicalized absolute filename, replacing
267: * a leading ~/ with the user's home dir, following symlinks, and
1.81 martynas 268: * and remove all occurrences of /./ and /../
1.1 deraadt 269: */
1.7 millert 270: char *
1.74 jason 271: adjustname(const char *fn, int slashslash)
1.1 deraadt 272: {
1.49 db 273: static char fnb[MAXPATHLEN];
1.74 jason 274: const char *cp, *ep = NULL;
1.57 kjell 275: char user[LOGIN_NAME_MAX], path[MAXPATHLEN];
276: size_t ulen, plen;
1.33 vincent 277:
278: path[0] = '\0';
1.74 jason 279:
1.75 kjell 280: if (slashslash == TRUE) {
1.74 jason 281: cp = fn + strlen(fn) - 1;
282: for (; cp >= fn; cp--) {
283: if (ep && (*cp == '/')) {
284: fn = ep;
285: break;
286: }
287: if (*cp == '/' || *cp == '~')
288: ep = cp;
289: else
290: ep = NULL;
291: }
292: }
293:
1.33 vincent 294: /* first handle tilde expansion */
295: if (fn[0] == '~') {
296: struct passwd *pw;
297:
298: cp = strchr(fn, '/');
299: if (cp == NULL)
300: cp = fn + strlen(fn); /* point to the NUL byte */
1.57 kjell 301: ulen = cp - &fn[1];
302: if (ulen >= sizeof(user)) {
303: ewprintf("Login name too long");
1.33 vincent 304: return (NULL);
305: }
1.57 kjell 306: if (ulen == 0) /* ~/ or ~ */
307: (void)strlcpy(user, getlogin(), sizeof(user));
1.59 deraadt 308: else { /* ~user/ or ~user */
1.57 kjell 309: memcpy(user, &fn[1], ulen);
310: user[ulen] = '\0';
311: }
1.33 vincent 312: pw = getpwnam(user);
313: if (pw == NULL) {
1.57 kjell 314: ewprintf("Unknown user %s", user);
1.33 vincent 315: return (NULL);
316: }
1.57 kjell 317: plen = strlcpy(path, pw->pw_dir, sizeof(path));
318: if (plen == 0 || path[plen - 1] != '/') {
319: if (strlcat(path, "/", sizeof(path)) >= sizeof(path)) {
320: ewprintf("Path too long");
321: return (NULL);
322: }
1.1 deraadt 323: }
1.33 vincent 324: fn = cp;
325: if (*fn == '/')
1.7 millert 326: fn++;
327: }
1.57 kjell 328: if (strlcat(path, fn, sizeof(path)) >= sizeof(path)) {
329: ewprintf("Path too long");
330: return (NULL);
331: }
1.33 vincent 332:
1.47 henning 333: if (realpath(path, fnb) == NULL)
1.57 kjell 334: (void)strlcpy(fnb, path, sizeof(fnb));
1.47 henning 335:
336: return (fnb);
1.1 deraadt 337: }
338:
339: #ifndef NO_STARTUP
340: /*
341: * Find a startup file for the user and return its name. As a service
342: * to other pieces of code that may want to find a startup file (like
343: * the terminal driver in particular), accepts a suffix to be appended
344: * to the startup file name.
345: */
346: char *
1.27 millert 347: startupfile(char *suffix)
1.1 deraadt 348: {
1.49 db 349: static char file[NFILEN];
1.16 mickey 350: char *home;
1.61 kjell 351: int ret;
1.12 art 352:
353: if ((home = getenv("HOME")) == NULL || *home == '\0')
354: goto nohome;
1.1 deraadt 355:
1.12 art 356: if (suffix == NULL) {
1.61 kjell 357: ret = snprintf(file, sizeof(file), "%s/.mg", home);
358: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 359: return (NULL);
1.12 art 360: } else {
1.61 kjell 361: ret = snprintf(file, sizeof(file), "%s/.mg-%s", home, suffix);
362: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 363: return (NULL);
1.1 deraadt 364: }
1.12 art 365:
366: if (access(file, R_OK) == 0)
1.32 vincent 367: return (file);
1.12 art 368: nohome:
369: #ifdef STARTUPFILE
1.27 millert 370: if (suffix == NULL) {
1.61 kjell 371: ret = snprintf(file, sizeof(file), "%s", STARTUPFILE);
372: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 373: return (NULL);
1.12 art 374: } else {
1.61 kjell 375: ret = snprintf(file, sizeof(file), "%s%s", STARTUPFILE,
376: suffix);
377: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 378: return (NULL);
1.12 art 379: }
380:
381: if (access(file, R_OK) == 0)
1.32 vincent 382: return (file);
1.61 kjell 383: #endif /* STARTUPFILE */
1.32 vincent 384: return (NULL);
1.1 deraadt 385: }
1.61 kjell 386: #endif /* !NO_STARTUP */
1.1 deraadt 387:
1.7 millert 388: int
1.27 millert 389: copy(char *frname, char *toname)
1.1 deraadt 390: {
1.70 deraadt 391: int ifd, ofd;
1.49 db 392: char buf[BUFSIZ];
1.66 kjell 393: mode_t fmode = DEFFILEMODE; /* XXX?? */
1.49 db 394: struct stat orig;
1.70 deraadt 395: ssize_t sr;
1.30 vincent 396:
397: if ((ifd = open(frname, O_RDONLY)) == -1)
398: return (FALSE);
399: if (fstat(ifd, &orig) == -1) {
400: ewprintf("fstat: %s", strerror(errno));
401: close(ifd);
402: return (FALSE);
403: }
404:
1.66 kjell 405: if ((ofd = open(toname, O_WRONLY|O_CREAT|O_TRUNC, fmode)) == -1) {
1.30 vincent 406: close(ifd);
407: return (FALSE);
408: }
1.70 deraadt 409: while ((sr = read(ifd, buf, sizeof(buf))) > 0) {
410: if (write(ofd, buf, (size_t)sr) != sr) {
1.30 vincent 411: ewprintf("write error : %s", strerror(errno));
412: break;
413: }
414: }
415: if (fchmod(ofd, orig.st_mode) == -1)
416: ewprintf("Cannot set original mode : %s", strerror(errno));
1.1 deraadt 417:
1.70 deraadt 418: if (sr == -1) {
1.30 vincent 419: ewprintf("Read error : %s", strerror(errno));
420: close(ifd);
421: close(ofd);
422: return (FALSE);
1.7 millert 423: }
1.30 vincent 424: /*
1.32 vincent 425: * It is "normal" for this to fail since we can't guarantee that
1.49 db 426: * we will be running as root.
1.30 vincent 427: */
428: if (fchown(ofd, orig.st_uid, orig.st_gid) && errno != EPERM)
429: ewprintf("Cannot set owner : %s", strerror(errno));
430:
431: (void) close(ifd);
432: (void) close(ofd);
433:
434: return (TRUE);
1.7 millert 435: }
1.1 deraadt 436:
1.7 millert 437: /*
1.1 deraadt 438: * return list of file names that match the name in buf.
439: */
1.62 deraadt 440: struct list *
1.25 vincent 441: make_file_list(char *buf)
1.7 millert 442: {
1.16 mickey 443: char *dir, *file, *cp;
1.71 kjell 444: size_t len, preflen;
445: int ret;
1.16 mickey 446: DIR *dirp;
447: struct dirent *dent;
1.68 kjell 448: struct list *last, *current;
449: char fl_name[NFILEN + 2];
1.49 db 450: char prefixx[NFILEN + 1];
1.7 millert 451:
452: /*
1.79 deraadt 453: * We need three different strings:
1.72 kjell 454:
455: * dir - the name of the directory containing what the user typed.
456: * Must be a real unix file name, e.g. no ~user, etc..
457: * Must not end in /.
458: * prefix - the portion of what the user typed that is before the
459: * names we are going to find in the directory. Must have a
460: * trailing / if the user typed it.
461: * names from the directory - We open dir, and return prefix
1.7 millert 462: * concatenated with names.
463: */
464:
465: /* first we get a directory name we can look up */
466: /*
467: * Names ending in . are potentially odd, because adjustname will
1.71 kjell 468: * treat foo/bar/.. as a foo/, whereas we are
1.7 millert 469: * interested in names starting with ..
470: */
471: len = strlen(buf);
1.71 kjell 472: if (len && buf[len - 1] == '.') {
1.7 millert 473: buf[len - 1] = 'x';
1.74 jason 474: dir = adjustname(buf, TRUE);
1.7 millert 475: buf[len - 1] = '.';
476: } else
1.74 jason 477: dir = adjustname(buf, TRUE);
1.33 vincent 478: if (dir == NULL)
1.36 vincent 479: return (NULL);
1.7 millert 480: /*
481: * If the user typed a trailing / or the empty string
482: * he wants us to use his file spec as a directory name.
483: */
1.71 kjell 484: if (len && buf[len - 1] != '/') {
1.7 millert 485: file = strrchr(dir, '/');
486: if (file) {
1.69 kjell 487: *file = '\0';
488: if (*dir == '\0')
1.7 millert 489: dir = "/";
1.49 db 490: } else
1.7 millert 491: return (NULL);
1.1 deraadt 492: }
1.7 millert 493: /* Now we get the prefix of the name the user typed. */
1.67 kjell 494: if (strlcpy(prefixx, buf, sizeof(prefixx)) >= sizeof(prefixx))
495: return (NULL);
1.7 millert 496: cp = strrchr(prefixx, '/');
497: if (cp == NULL)
1.67 kjell 498: prefixx[0] = '\0';
1.7 millert 499: else
1.67 kjell 500: cp[1] = '\0';
1.7 millert 501:
502: preflen = strlen(prefixx);
1.49 db 503: /* cp is the tail of buf that really needs to be compared. */
1.7 millert 504: cp = buf + preflen;
505: len = strlen(cp);
506:
507: /*
508: * Now make sure that file names will fit in the buffers allocated.
509: * SV files are fairly short. For BSD, something more general would
510: * be required.
511: */
1.71 kjell 512: if (preflen > NFILEN - MAXNAMLEN)
1.7 millert 513: return (NULL);
514:
515: /* loop over the specified directory, making up the list of files */
516:
517: /*
518: * Note that it is worth our time to filter out names that don't
519: * match, even though our caller is going to do so again, and to
520: * avoid doing the stat if completion is being done, because stat'ing
521: * every file in the directory is relatively expensive.
522: */
1.1 deraadt 523:
1.11 art 524: dirp = opendir(dir);
525: if (dirp == NULL)
1.7 millert 526: return (NULL);
527: last = NULL;
1.11 art 528:
529: while ((dent = readdir(dirp)) != NULL) {
1.18 art 530: int isdir;
1.83 kjell 531: if (strncmp(cp, dent->d_name, len) != 0)
1.11 art 532: continue;
1.18 art 533: isdir = 0;
534: if (dent->d_type == DT_DIR) {
535: isdir = 1;
536: } else if (dent->d_type == DT_LNK ||
537: dent->d_type == DT_UNKNOWN) {
538: struct stat statbuf;
539: char statname[NFILEN + 2];
540:
541: statbuf.st_mode = 0;
1.61 kjell 542: ret = snprintf(statname, sizeof(statname), "%s/%s",
543: dir, dent->d_name);
544: if (ret < 0 || ret > sizeof(statname) - 1)
1.18 art 545: continue;
546: if (stat(statname, &statbuf) < 0)
547: continue;
1.78 otto 548: if (S_ISDIR(statbuf.st_mode))
1.18 art 549: isdir = 1;
550: }
551:
1.68 kjell 552: if ((current = malloc(sizeof(struct list))) == NULL) {
553: free_file_list(last);
554: return (NULL);
555: }
556: ret = snprintf(fl_name, sizeof(fl_name),
1.61 kjell 557: "%s%s%s", prefixx, dent->d_name, isdir ? "/" : "");
1.68 kjell 558: if (ret < 0 || ret >= sizeof(fl_name)) {
1.11 art 559: free(current);
1.7 millert 560: continue;
561: }
1.68 kjell 562: current->l_next = last;
563: current->l_name = strdup(fl_name);
564: last = current;
1.1 deraadt 565: }
1.11 art 566: closedir(dirp);
1.1 deraadt 567:
1.7 millert 568: return (last);
1.54 kjell 569: }
570:
571: /*
572: * Test if a supplied filename refers to a directory
573: * Returns ABORT on error, TRUE if directory. FALSE otherwise
574: */
575: int
576: fisdir(const char *fname)
577: {
578: struct stat statbuf;
579:
580: if (stat(fname, &statbuf) != 0)
581: return (ABORT);
582:
583: if (S_ISDIR(statbuf.st_mode))
584: return (TRUE);
585:
586: return (FALSE);
1.82 kjell 587: }
588:
589: /*
590: * Check the mtime of the supplied filename.
591: * Return TRUE if last mtime matches, FALSE if not,
592: * If the stat fails, return TRUE and try the save anyway
593: */
594: int
595: fchecktime(struct buffer *bp)
596: {
597: struct stat sb;
598:
599: if (stat(bp->b_fname, &sb) == -1)
600: return (TRUE);
601:
602: if (bp->b_fi.fi_mtime.tv_sec != sb.st_mtimespec.tv_sec ||
603: bp->b_fi.fi_mtime.tv_nsec != sb.st_mtimespec.tv_nsec)
604: return (FALSE);
605:
606: return (TRUE);
607:
1.1 deraadt 608: }
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