3 * $Id: file.c,v 1.5 2002/02/22 23:43:32 mdw Exp $
5 * File source and target
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the `fw' port forwarder.
14 * `fw' is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * `fw' is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with `fw'; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.5 2002/02/22 23:43:32 mdw
33 * Call @xfree@ rather than @free@.
35 * Revision 1.4 2001/02/03 20:30:03 mdw
36 * Support re-reading config files on SIGHUP.
38 * Revision 1.3 1999/12/22 15:43:47 mdw
41 * Revision 1.2 1999/10/22 22:47:13 mdw
42 * New (empty) endpoint method required.
44 * Revision 1.1 1999/07/26 23:33:32 mdw
45 * New sources and targets.
49 /*----- Header files ------------------------------------------------------*/
59 #include <sys/types.h>
64 #include <mLib/alloc.h>
65 #include <mLib/dstr.h>
66 #include <mLib/fdflags.h>
79 /*----- Data structures ---------------------------------------------------*/
81 /* --- File specification --- */
83 typedef struct fspec {
91 #define FTYPE_GUESS 0u
96 /* --- File options --- */
98 typedef struct fopts {
102 /* --- File data block --- */
104 typedef struct fdata {
110 /* --- File source block --- */
112 typedef struct fsource {
117 /* --- File target block --- */
119 typedef struct ftarget {
124 /*----- Static variables --------------------------------------------------*/
126 static fopts file_opts = { O_TRUNC };
128 static reffd *rstdin, *rstdout;
131 /*----- File endpoint operations ------------------------------------------*/
133 /* --- @wclose@ --- */
135 static void fept_wclose(endpt *e)
143 /* --- @close@ --- */
145 static void fept_close(endpt *e)
155 /* --- Endpoint operations table --- */
157 static endpt_ops fept_ops = { 0, 0, fept_wclose, fept_close };
159 /*----- General operations on sources and targets -------------------------*/
161 /* --- @file_null@ --- *
163 * Arguments: @void *p@ = an uninteresting argument
167 * Use: Removes the reference to @rnull@ when the file closes.
170 static void file_null(void *p)
175 /* --- @file_nullref@ --- *
179 * Returns: A reference to a file descriptor open on /dev/null.
181 * Use: Obtains a file descriptor for /dev/null. The reference
182 * @rnull@ is `weak', so that I only have a descriptor open when
183 * I actually need one.
186 static reffd *file_nullref(void)
192 if ((n = open("/dev/null", O_RDWR)) < 0) {
193 fw_log(-1, "couldn't open `/dev/null': %s", strerror(errno));
196 fdflags(n, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
197 rnull = reffd_init(n);
198 reffd_handler(rnull, file_null, 0);
203 /* --- @file_fspec@ --- *
205 * Arguments: @fspec *f@ = pointer to filespec to fill in
206 * @scanner *sc@ = pointer to scanner to read from
210 * Use: Reads in a file spec.
213 static void file_fspec(fspec *f, scanner *sc)
216 unsigned type = FTYPE_GUESS;
219 /* --- Set up references to @stdin@ and @stdout@ --- */
222 fdflags(STDIN_FILENO, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
223 fdflags(STDOUT_FILENO, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
224 rstdin = reffd_init(STDIN_FILENO);
225 rstdout = reffd_init(STDOUT_FILENO);
228 /* --- Try to get an access type --- */
235 if (sc->t == CTOK_WORD) {
236 int i = conf_enum(sc, "fd,name,null", c ? ENUM_ABBREV : ENUM_NONE,
239 if (type && sc->t == ':')
243 /* --- Check for a valid file descriptor name --- */
245 if (sc->t == CTOK_WORD && type != FTYPE_NAME && type != FTYPE_NULL) {
246 if (strcmp(sc->d.buf, "stdin") == 0) {
249 } else if (strcmp(sc->d.buf, "stdout") == 0) {
255 else if (isdigit((unsigned char)*sc->d.buf)) {
256 int nfd = atoi(sc->d.buf);
258 case STDIN_FILENO: fd = rstdin; REFFD_INC(rstdin); break;
259 case STDOUT_FILENO: fd = rstdout; REFFD_INC(rstdout); break;
261 fd = reffd_init(nfd);
262 fdflags(nfd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
268 /* --- Sort out what to do as a result --- */
270 if (type == FTYPE_NULL)
271 f->type = FTYPE_NULL;
276 } else if (type == FTYPE_FD) {
277 if (sc->t == CTOK_WORD)
278 error(sc, "bad file descriptor `%s'", sc->d.buf);
280 error(sc, "parse error, expected file descriptor");
283 conf_name(sc, '/', &d);
284 f->type = FTYPE_NAME;
285 f->u.name = xstrdup(d.buf);
292 static void file_read(fdata *f, scanner *sc)
294 file_fspec(&f->in, sc);
297 if (f->out.type == FTYPE_FD && f->out.u.fd == rstdin)
298 f->out.u.fd = rstdout;
301 file_fspec(&f->out, sc);
303 f->fa = fattr_global;
307 /* --- @print@ --- */
309 static void file_pfspec(fspec *f, dstr *d)
313 switch (f->u.fd->fd) {
315 dstr_puts(d, "stdin");
318 dstr_puts(d, "stdout");
321 dstr_putf(d, "fd:%i", f->u.fd->fd);
326 dstr_putf(d, "name:%s", f->u.name);
329 dstr_puts(d, "null");
334 static void file_desc(fdata *f, dstr *d)
336 dstr_puts(d, "file ");
337 file_pfspec(&f->in, d);
339 file_pfspec(&f->out, d);
342 /* --- @option@ --- */
344 static int file_option(fdata *f, scanner *sc)
346 fopts *fo = f ? &f->fo : &file_opts;
348 CONF_BEGIN(sc, "file", "file")
350 /* --- Handle file-specific options --- */
352 if (strcmp(sc->d.buf, "create") == 0) {
356 switch (conf_enum(sc, "no,yes", ENUM_ABBREV, "create status")) {
357 case 0: fo->of &= ~O_CREAT; break;
358 case 1: fo->of |= O_CREAT; break;
363 else if (strcmp(sc->d.buf, "open") == 0) {
367 fo->of &= ~(O_TRUNC | O_APPEND | O_EXCL);
368 switch (conf_enum(sc, "no,truncate,append",
369 ENUM_ABBREV, "open status")) {
370 case 0: fo->of |= O_EXCL; break;
371 case 1: fo->of |= O_TRUNC; break;
372 case 2: fo->of |= O_APPEND; break;
377 /* --- See if it's a file attribute --- */
380 fattr *fa = f ? &f->fa : &fattr_global;
381 if (fattr_option(sc, fa))
385 /* --- Nobody understood it --- */
390 /* --- @endpt@ --- */
392 static endpt *file_endpt(fdata *f, const char *desc)
394 reffd *in = 0, *out = 0;
397 /* --- Make the input file first --- */
399 switch (f->in.type) {
409 if ((fd = open(f->in.u.name, O_RDONLY | O_NONBLOCK)) < 0) {
410 fw_log(-1, "[%s] couldn't open `%s' for reading: %s",
411 desc, f->in.u.name, strerror(errno));
418 /* --- Make the output file second --- */
420 switch (f->out.type) {
422 out = file_nullref();
429 int m = f->fo.of | O_WRONLY | O_NONBLOCK;
432 /* --- First try creating the file --- *
434 * This lets me know whether to set the file attributes or not. It
435 * also stands a chance of noticing people playing silly beggars with
440 (fd = open(f->out.u.name, m | O_EXCL, f->fa.mode)) < 0 &&
441 (errno != EEXIST || (m & O_EXCL))) {
442 fw_log(-1, "[%s] couldn't create `%s': %s",
443 desc, f->out.u.name, strerror(errno));
449 if (fattr_apply(f->out.u.name, &f->fa)) {
450 fw_log(-1, "[%s] couldn't apply file attributes to `%s': %s",
451 desc, f->out.u.name, strerror(errno));
453 } else if ((fd = open(f->out.u.name, m & ~O_CREAT)) < 0) {
454 fw_log(-1, "[%s] couldn't open `%s': %s",
455 desc, f->out.u.name, strerror(errno));
460 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
461 out = reffd_init(fd);
465 /* --- Set up the endpoint --- */
478 /* --- @destroy@ --- */
480 static void file_destroy(fdata *f)
482 if (f->in.type == FTYPE_NAME)
484 if (f->out.type == FTYPE_NAME)
485 xfree(f->out.u.name);
488 /*----- File source description -------------------------------------------*/
490 /* --- @option@ --- */
492 static int fsource_option(source *s, scanner *sc)
494 fsource *fs = (fsource *)s;
495 return (file_option(fs ? &fs->f : 0, sc));
500 static source *fsource_read(scanner *sc)
504 if (!conf_prefix(sc, "file"))
506 fs = CREATE(fsource);
507 fs->s.ops = &fsource_ops;
509 file_read(&fs->f, sc);
513 /* --- @attach@ --- */
515 static void fsource_destroy(source */*s*/);
517 static void fsource_attach(source *s, scanner *sc, target *t)
519 fsource *fs = (fsource *)s;
522 /* --- Set up the source description string --- */
526 file_desc(&fs->f, &d);
527 dstr_puts(&d, " -> ");
528 dstr_puts(&d, t->desc);
529 fs->s.desc = xstrdup(d.buf);
533 /* --- And then create the endpoints --- */
535 if ((ee = t->ops->create(t, fs->s.desc)) == 0)
537 if ((e = file_endpt(&fs->f, fs->s.desc)) == 0) {
543 /* --- Dispose of the source and target now --- */
547 fsource_destroy(&fs->s);
550 /* --- @destroy@ --- */
552 static void fsource_destroy(source *s)
554 fsource *fs = (fsource *)s;
556 file_destroy(&fs->f);
560 /* --- File source operations --- */
562 source_ops fsource_ops = {
564 fsource_option, fsource_read, fsource_attach, fsource_destroy
567 /*----- File target description -------------------------------------------*/
569 /* --- @option@ --- */
571 static int ftarget_option(target *t, scanner *sc)
573 ftarget *ft = (ftarget *)t;
574 return (file_option(ft ? &ft->f : 0, sc));
579 static target *ftarget_read(scanner *sc)
584 if (!conf_prefix(sc, "file"))
586 ft = CREATE(ftarget);
587 ft->t.ops = &ftarget_ops;
588 file_read(&ft->f, sc);
589 file_desc(&ft->f, &d);
590 ft->t.desc = xstrdup(d.buf);
595 /* --- @create@ --- */
597 static endpt *ftarget_create(target *t, const char *desc)
599 ftarget *ft = (ftarget *)t;
600 endpt *e = file_endpt(&ft->f, desc);
604 /* --- @destroy@ --- */
606 static void ftarget_destroy(target *t)
608 ftarget *ft = (ftarget *)t;
609 file_destroy(&ft->f);
614 /* --- File target operations --- */
616 target_ops ftarget_ops = {
618 ftarget_option, ftarget_read, ftarget_create, ftarget_destroy
621 /*----- That's all, folks -------------------------------------------------*/