Annotation of src/usr.bin/mg/fileio.c, Revision 1.83
1.83 ! kjell 1: /* $OpenBSD: fileio.c,v 1.82 2008/09/15 16:11:35 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"
1.1 deraadt 9:
1.56 deraadt 10:
1.82 kjell 11: #include <sys/types.h>
1.72 kjell 12: #include <sys/stat.h>
1.56 deraadt 13: #include <sys/time.h>
1.76 jason 14: #include <sys/resource.h>
1.53 kjell 15: #include <sys/wait.h>
1.72 kjell 16:
17: #include <fcntl.h>
1.33 vincent 18: #include <limits.h>
1.76 jason 19: #include <dirent.h>
1.72 kjell 20: #include <pwd.h>
1.21 vincent 21: #include <string.h>
1.9 millert 22: #include <unistd.h>
1.1 deraadt 23:
1.72 kjell 24: #include "kbd.h"
25:
1.49 db 26: static FILE *ffp;
27:
1.1 deraadt 28: /*
29: * Open a file for reading.
30: */
1.7 millert 31: int
1.62 deraadt 32: ffropen(const char *fn, struct buffer *bp)
1.7 millert 33: {
1.46 jfb 34: if ((ffp = fopen(fn, "r")) == NULL) {
35: if (errno == ENOENT)
36: return (FIOFNF);
37: return (FIOERR);
38: }
1.53 kjell 39:
40: /* If 'fn' is a directory open it with dired. */
1.54 kjell 41: if (fisdir(fn) == TRUE)
1.53 kjell 42: return (FIODIR);
43:
1.82 kjell 44: ffstat(bp);
45:
46: return (FIOSUC);
47: }
48:
49: /*
50: * Update stat/dirty info
51: */
52: void
53: ffstat(struct buffer *bp)
54: {
55: struct stat sb;
56:
57: if (bp && fstat(fileno(ffp), &sb) == 0) {
1.7 millert 58: /* set highorder bit to make sure this isn't all zero */
1.82 kjell 59: bp->b_fi.fi_mode = sb.st_mode | 0x8000;
60: bp->b_fi.fi_uid = sb.st_uid;
61: bp->b_fi.fi_gid = sb.st_gid;
62: bp->b_fi.fi_mtime = sb.st_mtimespec;
63: /* Clear the ignore flag */
64: bp->b_flag &= ~(BFIGNDIRTY | BFDIRTY);
1.1 deraadt 65: }
1.82 kjell 66: }
1.53 kjell 67:
1.82 kjell 68: /*
69: * Update the status/dirty info. If there is an error,
70: * there's not a lot we can do.
71: */
72: int
73: fupdstat(struct buffer *bp)
74: {
75: if ((ffp = fopen(bp->b_fname, "r")) == NULL) {
76: if (errno == ENOENT)
77: return (FIOFNF);
78: return (FIOERR);
79: }
80: ffstat(bp);
81: ffclose(bp);
1.1 deraadt 82: return (FIOSUC);
83: }
84:
85: /*
86: * Open a file for writing.
87: */
1.7 millert 88: int
1.62 deraadt 89: ffwopen(const char *fn, struct buffer *bp)
1.7 millert 90: {
1.49 db 91: int fd;
1.66 kjell 92: mode_t fmode = DEFFILEMODE;
1.7 millert 93:
1.24 deraadt 94: if (bp && bp->b_fi.fi_mode)
1.66 kjell 95: fmode = bp->b_fi.fi_mode & 07777;
1.24 deraadt 96:
1.66 kjell 97: fd = open(fn, O_RDWR | O_CREAT | O_TRUNC, fmode);
1.24 deraadt 98: if (fd == -1) {
99: ffp = NULL;
1.21 vincent 100: ewprintf("Cannot open file for writing : %s", strerror(errno));
1.1 deraadt 101: return (FIOERR);
1.34 deraadt 102: }
1.24 deraadt 103:
104: if ((ffp = fdopen(fd, "w")) == NULL) {
105: ewprintf("Cannot open file for writing : %s", strerror(errno));
106: close(fd);
1.34 deraadt 107: return (FIOERR);
1.1 deraadt 108: }
1.7 millert 109:
110: /*
111: * If we have file information, use it. We don't bother to check for
112: * errors, because there's no a lot we can do about it. Certainly
1.24 deraadt 113: * trying to change ownership will fail if we aren't root. That's
1.7 millert 114: * probably OK. If we don't have info, no need to get it, since any
115: * future writes will do the same thing.
1.1 deraadt 116: */
117: if (bp && bp->b_fi.fi_mode) {
1.28 deraadt 118: fchmod(fd, bp->b_fi.fi_mode & 07777);
119: fchown(fd, bp->b_fi.fi_uid, bp->b_fi.fi_gid);
1.1 deraadt 120: }
121: return (FIOSUC);
122: }
123:
124: /*
125: * Close a file.
1.7 millert 126: * XXX - Should look at the status.
1.1 deraadt 127: */
1.7 millert 128: /* ARGSUSED */
129: int
1.62 deraadt 130: ffclose(struct buffer *bp)
1.7 millert 131: {
1.13 art 132: (void) fclose(ffp);
1.1 deraadt 133: return (FIOSUC);
134: }
135:
136: /*
1.41 vincent 137: * Write a buffer to the already opened file. bp points to the
1.1 deraadt 138: * buffer. Return the status.
139: */
1.7 millert 140: int
1.62 deraadt 141: ffputbuf(struct buffer *bp)
1.1 deraadt 142: {
1.62 deraadt 143: struct line *lp, *lpend;
1.7 millert 144:
1.77 kjell 145: lpend = bp->b_headp;
1.41 vincent 146: for (lp = lforw(lpend); lp != lpend; lp = lforw(lp)) {
147: if (fwrite(ltext(lp), 1, llength(lp), ffp) != llength(lp)) {
148: ewprintf("Write I/O error");
1.49 db 149: return (FIOERR);
1.7 millert 150: }
1.41 vincent 151: if (lforw(lp) != lpend) /* no implied \n on last line */
152: putc('\n', ffp);
1.48 deraadt 153: }
1.42 vincent 154: /*
155: * XXX should be variable controlled (once we have variables)
156: */
157: if (llength(lback(lpend)) != 0) {
158: if (eyorn("No newline at end of file, add one") == TRUE) {
159: lnewline_at(lback(lpend), llength(lback(lpend)));
160: putc('\n', ffp);
161: }
162: }
1.7 millert 163: return (FIOSUC);
1.1 deraadt 164: }
165:
166: /*
167: * Read a line from a file, and store the bytes
168: * in the supplied buffer. Stop on end of file or end of
169: * line. When FIOEOF is returned, there is a valid line
170: * of data without the normally implied \n.
1.80 kjell 171: * If the line length exceeds nbuf, FIOLONG is returned.
1.1 deraadt 172: */
1.7 millert 173: int
1.25 vincent 174: ffgetline(char *buf, int nbuf, int *nbytes)
1.1 deraadt 175: {
1.16 mickey 176: int c, i;
1.1 deraadt 177:
178: i = 0;
1.7 millert 179: while ((c = getc(ffp)) != EOF && c != '\n') {
1.1 deraadt 180: buf[i++] = c;
1.7 millert 181: if (i >= nbuf)
1.49 db 182: return (FIOLONG);
1.1 deraadt 183: }
1.7 millert 184: if (c == EOF && ferror(ffp) != FALSE) {
1.1 deraadt 185: ewprintf("File read error");
1.49 db 186: return (FIOERR);
1.1 deraadt 187: }
188: *nbytes = i;
1.49 db 189: return (c == EOF ? FIOEOF : FIOSUC);
1.1 deraadt 190: }
191:
192: /*
1.9 millert 193: * Make a backup copy of "fname". On Unix the backup has the same
194: * name as the original file, with a "~" on the end; this seems to
195: * be newest of the new-speak. The error handling is all in "file.c".
196: * We do a copy instead of a rename since otherwise another process
197: * with an open fd will get the backup, not the new file. This is
198: * a problem when using mg with things like crontab and vipw.
1.1 deraadt 199: */
1.7 millert 200: int
1.25 vincent 201: fbackupfile(const char *fn)
1.7 millert 202: {
1.49 db 203: struct stat sb;
204: int from, to, serrno;
205: ssize_t nread;
206: char buf[BUFSIZ];
1.44 millert 207: char *nname, *tname;
1.1 deraadt 208:
1.35 vincent 209: if (stat(fn, &sb) == -1) {
210: ewprintf("Can't stat %s : %s", fn, strerror(errno));
211: return (FALSE);
212: }
213:
1.21 vincent 214: if (asprintf(&nname, "%s~", fn) == -1) {
1.44 millert 215: ewprintf("Can't allocate temp file name : %s", strerror(errno));
216: return (ABORT);
217: }
218:
219: if (asprintf(&tname, "%s.XXXXXXXXXX", fn) == -1) {
220: ewprintf("Can't allocate temp file name : %s", strerror(errno));
221: free(nname);
1.1 deraadt 222: return (ABORT);
1.9 millert 223: }
224:
1.21 vincent 225: if ((from = open(fn, O_RDONLY)) == -1) {
226: free(nname);
1.44 millert 227: free(tname);
1.1 deraadt 228: return (FALSE);
1.21 vincent 229: }
1.44 millert 230: to = mkstemp(tname);
1.9 millert 231: if (to == -1) {
232: serrno = errno;
233: close(from);
1.21 vincent 234: free(nname);
1.44 millert 235: free(tname);
1.9 millert 236: errno = serrno;
237: return (FALSE);
238: }
239: while ((nread = read(from, buf, sizeof(buf))) > 0) {
1.70 deraadt 240: if (write(to, buf, (size_t)nread) != nread) {
1.40 vincent 241: nread = -1;
242: break;
1.9 millert 243: }
1.1 deraadt 244: }
1.9 millert 245: serrno = errno;
1.44 millert 246: (void) fchmod(to, (sb.st_mode & 0777));
1.9 millert 247: close(from);
248: close(to);
1.21 vincent 249: if (nread == -1) {
1.44 millert 250: if (unlink(tname) == -1)
1.21 vincent 251: ewprintf("Can't unlink temp : %s", strerror(errno));
1.44 millert 252: } else {
253: if (rename(tname, nname) == -1) {
254: ewprintf("Can't rename temp : %s", strerror(errno));
255: (void) unlink(tname);
1.45 henning 256: nread = -1;
1.44 millert 257: }
1.21 vincent 258: }
1.1 deraadt 259: free(nname);
1.44 millert 260: free(tname);
1.9 millert 261: errno = serrno;
1.22 deraadt 262:
1.9 millert 263: return (nread == -1 ? FALSE : TRUE);
1.1 deraadt 264: }
265:
266: /*
1.73 kjell 267: * Convert "fn" to a canonicalized absolute filename, replacing
268: * a leading ~/ with the user's home dir, following symlinks, and
1.81 martynas 269: * and remove all occurrences of /./ and /../
1.1 deraadt 270: */
1.7 millert 271: char *
1.74 jason 272: adjustname(const char *fn, int slashslash)
1.1 deraadt 273: {
1.49 db 274: static char fnb[MAXPATHLEN];
1.74 jason 275: const char *cp, *ep = NULL;
1.57 kjell 276: char user[LOGIN_NAME_MAX], path[MAXPATHLEN];
277: size_t ulen, plen;
1.33 vincent 278:
279: path[0] = '\0';
1.74 jason 280:
1.75 kjell 281: if (slashslash == TRUE) {
1.74 jason 282: cp = fn + strlen(fn) - 1;
283: for (; cp >= fn; cp--) {
284: if (ep && (*cp == '/')) {
285: fn = ep;
286: break;
287: }
288: if (*cp == '/' || *cp == '~')
289: ep = cp;
290: else
291: ep = NULL;
292: }
293: }
294:
1.33 vincent 295: /* first handle tilde expansion */
296: if (fn[0] == '~') {
297: struct passwd *pw;
298:
299: cp = strchr(fn, '/');
300: if (cp == NULL)
301: cp = fn + strlen(fn); /* point to the NUL byte */
1.57 kjell 302: ulen = cp - &fn[1];
303: if (ulen >= sizeof(user)) {
304: ewprintf("Login name too long");
1.33 vincent 305: return (NULL);
306: }
1.57 kjell 307: if (ulen == 0) /* ~/ or ~ */
308: (void)strlcpy(user, getlogin(), sizeof(user));
1.59 deraadt 309: else { /* ~user/ or ~user */
1.57 kjell 310: memcpy(user, &fn[1], ulen);
311: user[ulen] = '\0';
312: }
1.33 vincent 313: pw = getpwnam(user);
314: if (pw == NULL) {
1.57 kjell 315: ewprintf("Unknown user %s", user);
1.33 vincent 316: return (NULL);
317: }
1.57 kjell 318: plen = strlcpy(path, pw->pw_dir, sizeof(path));
319: if (plen == 0 || path[plen - 1] != '/') {
320: if (strlcat(path, "/", sizeof(path)) >= sizeof(path)) {
321: ewprintf("Path too long");
322: return (NULL);
323: }
1.1 deraadt 324: }
1.33 vincent 325: fn = cp;
326: if (*fn == '/')
1.7 millert 327: fn++;
328: }
1.57 kjell 329: if (strlcat(path, fn, sizeof(path)) >= sizeof(path)) {
330: ewprintf("Path too long");
331: return (NULL);
332: }
1.33 vincent 333:
1.47 henning 334: if (realpath(path, fnb) == NULL)
1.57 kjell 335: (void)strlcpy(fnb, path, sizeof(fnb));
1.47 henning 336:
337: return (fnb);
1.1 deraadt 338: }
339:
340: #ifndef NO_STARTUP
341: /*
342: * Find a startup file for the user and return its name. As a service
343: * to other pieces of code that may want to find a startup file (like
344: * the terminal driver in particular), accepts a suffix to be appended
345: * to the startup file name.
346: */
347: char *
1.27 millert 348: startupfile(char *suffix)
1.1 deraadt 349: {
1.49 db 350: static char file[NFILEN];
1.16 mickey 351: char *home;
1.61 kjell 352: int ret;
1.12 art 353:
354: if ((home = getenv("HOME")) == NULL || *home == '\0')
355: goto nohome;
1.1 deraadt 356:
1.12 art 357: if (suffix == NULL) {
1.61 kjell 358: ret = snprintf(file, sizeof(file), "%s/.mg", home);
359: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 360: return (NULL);
1.12 art 361: } else {
1.61 kjell 362: ret = snprintf(file, sizeof(file), "%s/.mg-%s", home, suffix);
363: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 364: return (NULL);
1.1 deraadt 365: }
1.12 art 366:
367: if (access(file, R_OK) == 0)
1.32 vincent 368: return (file);
1.12 art 369: nohome:
370: #ifdef STARTUPFILE
1.27 millert 371: if (suffix == NULL) {
1.61 kjell 372: ret = snprintf(file, sizeof(file), "%s", STARTUPFILE);
373: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 374: return (NULL);
1.12 art 375: } else {
1.61 kjell 376: ret = snprintf(file, sizeof(file), "%s%s", STARTUPFILE,
377: suffix);
378: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 379: return (NULL);
1.12 art 380: }
381:
382: if (access(file, R_OK) == 0)
1.32 vincent 383: return (file);
1.61 kjell 384: #endif /* STARTUPFILE */
1.32 vincent 385: return (NULL);
1.1 deraadt 386: }
1.61 kjell 387: #endif /* !NO_STARTUP */
1.1 deraadt 388:
1.7 millert 389: int
1.27 millert 390: copy(char *frname, char *toname)
1.1 deraadt 391: {
1.70 deraadt 392: int ifd, ofd;
1.49 db 393: char buf[BUFSIZ];
1.66 kjell 394: mode_t fmode = DEFFILEMODE; /* XXX?? */
1.49 db 395: struct stat orig;
1.70 deraadt 396: ssize_t sr;
1.30 vincent 397:
398: if ((ifd = open(frname, O_RDONLY)) == -1)
399: return (FALSE);
400: if (fstat(ifd, &orig) == -1) {
401: ewprintf("fstat: %s", strerror(errno));
402: close(ifd);
403: return (FALSE);
404: }
405:
1.66 kjell 406: if ((ofd = open(toname, O_WRONLY|O_CREAT|O_TRUNC, fmode)) == -1) {
1.30 vincent 407: close(ifd);
408: return (FALSE);
409: }
1.70 deraadt 410: while ((sr = read(ifd, buf, sizeof(buf))) > 0) {
411: if (write(ofd, buf, (size_t)sr) != sr) {
1.30 vincent 412: ewprintf("write error : %s", strerror(errno));
413: break;
414: }
415: }
416: if (fchmod(ofd, orig.st_mode) == -1)
417: ewprintf("Cannot set original mode : %s", strerror(errno));
1.1 deraadt 418:
1.70 deraadt 419: if (sr == -1) {
1.30 vincent 420: ewprintf("Read error : %s", strerror(errno));
421: close(ifd);
422: close(ofd);
423: return (FALSE);
1.7 millert 424: }
1.30 vincent 425: /*
1.32 vincent 426: * It is "normal" for this to fail since we can't guarantee that
1.49 db 427: * we will be running as root.
1.30 vincent 428: */
429: if (fchown(ofd, orig.st_uid, orig.st_gid) && errno != EPERM)
430: ewprintf("Cannot set owner : %s", strerror(errno));
431:
432: (void) close(ifd);
433: (void) close(ofd);
434:
435: return (TRUE);
1.7 millert 436: }
1.1 deraadt 437:
1.7 millert 438: /*
1.1 deraadt 439: * return list of file names that match the name in buf.
440: */
1.62 deraadt 441: struct list *
1.25 vincent 442: make_file_list(char *buf)
1.7 millert 443: {
1.16 mickey 444: char *dir, *file, *cp;
1.71 kjell 445: size_t len, preflen;
446: int ret;
1.16 mickey 447: DIR *dirp;
448: struct dirent *dent;
1.68 kjell 449: struct list *last, *current;
450: char fl_name[NFILEN + 2];
1.49 db 451: char prefixx[NFILEN + 1];
1.7 millert 452:
453: /*
1.79 deraadt 454: * We need three different strings:
1.72 kjell 455:
456: * dir - the name of the directory containing what the user typed.
457: * Must be a real unix file name, e.g. no ~user, etc..
458: * Must not end in /.
459: * prefix - the portion of what the user typed that is before the
460: * names we are going to find in the directory. Must have a
461: * trailing / if the user typed it.
462: * names from the directory - We open dir, and return prefix
1.7 millert 463: * concatenated with names.
464: */
465:
466: /* first we get a directory name we can look up */
467: /*
468: * Names ending in . are potentially odd, because adjustname will
1.71 kjell 469: * treat foo/bar/.. as a foo/, whereas we are
1.7 millert 470: * interested in names starting with ..
471: */
472: len = strlen(buf);
1.71 kjell 473: if (len && buf[len - 1] == '.') {
1.7 millert 474: buf[len - 1] = 'x';
1.74 jason 475: dir = adjustname(buf, TRUE);
1.7 millert 476: buf[len - 1] = '.';
477: } else
1.74 jason 478: dir = adjustname(buf, TRUE);
1.33 vincent 479: if (dir == NULL)
1.36 vincent 480: return (NULL);
1.7 millert 481: /*
482: * If the user typed a trailing / or the empty string
483: * he wants us to use his file spec as a directory name.
484: */
1.71 kjell 485: if (len && buf[len - 1] != '/') {
1.7 millert 486: file = strrchr(dir, '/');
487: if (file) {
1.69 kjell 488: *file = '\0';
489: if (*dir == '\0')
1.7 millert 490: dir = "/";
1.49 db 491: } else
1.7 millert 492: return (NULL);
1.1 deraadt 493: }
1.7 millert 494: /* Now we get the prefix of the name the user typed. */
1.67 kjell 495: if (strlcpy(prefixx, buf, sizeof(prefixx)) >= sizeof(prefixx))
496: return (NULL);
1.7 millert 497: cp = strrchr(prefixx, '/');
498: if (cp == NULL)
1.67 kjell 499: prefixx[0] = '\0';
1.7 millert 500: else
1.67 kjell 501: cp[1] = '\0';
1.7 millert 502:
503: preflen = strlen(prefixx);
1.49 db 504: /* cp is the tail of buf that really needs to be compared. */
1.7 millert 505: cp = buf + preflen;
506: len = strlen(cp);
507:
508: /*
509: * Now make sure that file names will fit in the buffers allocated.
510: * SV files are fairly short. For BSD, something more general would
511: * be required.
512: */
1.71 kjell 513: if (preflen > NFILEN - MAXNAMLEN)
1.7 millert 514: return (NULL);
515:
516: /* loop over the specified directory, making up the list of files */
517:
518: /*
519: * Note that it is worth our time to filter out names that don't
520: * match, even though our caller is going to do so again, and to
521: * avoid doing the stat if completion is being done, because stat'ing
522: * every file in the directory is relatively expensive.
523: */
1.1 deraadt 524:
1.11 art 525: dirp = opendir(dir);
526: if (dirp == NULL)
1.7 millert 527: return (NULL);
528: last = NULL;
1.11 art 529:
530: while ((dent = readdir(dirp)) != NULL) {
1.18 art 531: int isdir;
1.83 ! kjell 532: if (strncmp(cp, dent->d_name, len) != 0)
1.11 art 533: continue;
1.18 art 534: isdir = 0;
535: if (dent->d_type == DT_DIR) {
536: isdir = 1;
537: } else if (dent->d_type == DT_LNK ||
538: dent->d_type == DT_UNKNOWN) {
539: struct stat statbuf;
540: char statname[NFILEN + 2];
541:
542: statbuf.st_mode = 0;
1.61 kjell 543: ret = snprintf(statname, sizeof(statname), "%s/%s",
544: dir, dent->d_name);
545: if (ret < 0 || ret > sizeof(statname) - 1)
1.18 art 546: continue;
547: if (stat(statname, &statbuf) < 0)
548: continue;
1.78 otto 549: if (S_ISDIR(statbuf.st_mode))
1.18 art 550: isdir = 1;
551: }
552:
1.68 kjell 553: if ((current = malloc(sizeof(struct list))) == NULL) {
554: free_file_list(last);
555: return (NULL);
556: }
557: ret = snprintf(fl_name, sizeof(fl_name),
1.61 kjell 558: "%s%s%s", prefixx, dent->d_name, isdir ? "/" : "");
1.68 kjell 559: if (ret < 0 || ret >= sizeof(fl_name)) {
1.11 art 560: free(current);
1.7 millert 561: continue;
562: }
1.68 kjell 563: current->l_next = last;
564: current->l_name = strdup(fl_name);
565: last = current;
1.1 deraadt 566: }
1.11 art 567: closedir(dirp);
1.1 deraadt 568:
1.7 millert 569: return (last);
1.54 kjell 570: }
571:
572: /*
573: * Test if a supplied filename refers to a directory
574: * Returns ABORT on error, TRUE if directory. FALSE otherwise
575: */
576: int
577: fisdir(const char *fname)
578: {
579: struct stat statbuf;
580:
581: if (stat(fname, &statbuf) != 0)
582: return (ABORT);
583:
584: if (S_ISDIR(statbuf.st_mode))
585: return (TRUE);
586:
587: return (FALSE);
1.82 kjell 588: }
589:
590: /*
591: * Check the mtime of the supplied filename.
592: * Return TRUE if last mtime matches, FALSE if not,
593: * If the stat fails, return TRUE and try the save anyway
594: */
595: int
596: fchecktime(struct buffer *bp)
597: {
598: struct stat sb;
599:
600: if (stat(bp->b_fname, &sb) == -1)
601: return (TRUE);
602:
603: if (bp->b_fi.fi_mtime.tv_sec != sb.st_mtimespec.tv_sec ||
604: bp->b_fi.fi_mtime.tv_nsec != sb.st_mtimespec.tv_nsec)
605: return (FALSE);
606:
607: return (TRUE);
608:
1.1 deraadt 609: }
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