lib/libfetch/file.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1998-2011 Dag-Erling Smørgrav
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer
  12  *    in this position and unchanged.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  * $FreeBSD: head/lib/libfetch/file.c 326219 2017-11-26 02:00:33Z pfg $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/stat.h>
  35
  36 #include <dirent.h>
  37 #include <fcntl.h>
  38 #include <stdio.h>
  39 #include <string.h>
  40
  41 #include "fetch.h"
  42 #include "common.h"
  43
  44 FILE *
  45 fetchXGetFile(struct url *u, struct url_stat *us, const char *flags)
  46 {
  47         FILE *f;
  48
  49         if (us && fetchStatFile(u, us, flags) == -1)
  50                 return (NULL);
  51
  52         f = fopen(u->doc, "re");
  53
  54         if (f == NULL) {
  55                 fetch_syserr();
  56                 return (NULL);
  57         }
  58
  59         if (u->offset && fseeko(f, u->offset, SEEK_SET) == -1) {
  60                 fclose(f);
  61                 fetch_syserr();
  62                 return (NULL);
  63         }
  64
  65         return (f);
  66 }
  67
  68 FILE *
  69 fetchGetFile(struct url *u, const char *flags)
  70 {
  71         return (fetchXGetFile(u, NULL, flags));
  72 }
  73
  74 FILE *
  75 fetchPutFile(struct url *u, const char *flags)
  76 {
  77         FILE *f;
  78
  79         if (CHECK_FLAG('a'))
  80                 f = fopen(u->doc, "ae");
  81         else
  82                 f = fopen(u->doc, "w+e");
  83
  84         if (f == NULL) {
  85                 fetch_syserr();
  86                 return (NULL);
  87         }
  88
  89         if (u->offset && fseeko(f, u->offset, SEEK_SET) == -1) {
  90                 fclose(f);
  91                 fetch_syserr();
  92                 return (NULL);
  93         }
  94
  95         return (f);
  96 }
  97
  98 static int
  99 fetch_stat_file(const char *fn, struct url_stat *us)
 100 {
 101         struct stat sb;
 102
 103         us->size = -1;
 104         us->atime = us->mtime = 0;
 105         if (stat(fn, &sb) == -1) {
 106                 fetch_syserr();
 107                 return (-1);
 108         }
 109         us->size = sb.st_size;
 110         us->atime = sb.st_atime;
 111         us->mtime = sb.st_mtime;
 112         return (0);
 113 }
 114
 115 int
 116 fetchStatFile(struct url *u, struct url_stat *us, const char *flags __unused)
 117 {
 118         return (fetch_stat_file(u->doc, us));
 119 }
 120
 121 struct url_ent *
 122 fetchListFile(struct url *u, const char *flags __unused)
 123 {
 124         struct dirent *de;
 125         struct url_stat us;
 126         struct url_ent *ue;
 127         int size, len;
 128         char fn[PATH_MAX], *p;
 129         DIR *dir;
 130         int l;
 131
 132         if ((dir = opendir(u->doc)) == NULL) {
 133                 fetch_syserr();
 134                 return (NULL);
 135         }
 136
 137         ue = NULL;
 138         strncpy(fn, u->doc, sizeof(fn) - 2);
 139         fn[sizeof(fn) - 2] = 0;
 140         strcat(fn, "/");
 141         p = strchr(fn, 0);
 142         l = sizeof(fn) - strlen(fn) - 1;
 143
 144         while ((de = readdir(dir)) != NULL) {
 145                 strncpy(p, de->d_name, l - 1);
 146                 p[l - 1] = 0;
 147                 if (fetch_stat_file(fn, &us) == -1)
 148                         /* should I return a partial result, or abort? */
 149                         break;
 150                 fetch_add_entry(&ue, &size, &len, de->d_name, &us);
 151         }
 152
 153         closedir(dir);
 154         return (ue);
 155 }