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util.c revision 1.2 
      1 /*-
      2  * Copyright (c) 2007 Joerg Sonnenberger <joerg (at) NetBSD.org>.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in
     13  *    the documentation and/or other materials provided with the
     14  *    distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     19  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
     20  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
     22  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     24  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #if HAVE_CONFIG_H
     31 #include "config.h"
     32 #endif
     33 
     34 #include <nbcompat.h>
     35 
     36 #if HAVE_SYS_STAT_H
     37 #include <sys/stat.h>
     38 #endif
     39 #if HAVE_ERR_H
     40 #include <err.h>
     41 #endif
     42 #include <fcntl.h>
     43 #if HAVE_PWD_H
     44 #include <grp.h>
     45 #endif
     46 #include <limits.h>
     47 #if HAVE_PWD_H
     48 #include <pwd.h>
     49 #endif
     50 #include <stdlib.h>
     51 #include <string.h>
     52 #include <time.h>
     53 #include <unistd.h>
     54 
     55 #include "lib.h"
     56 #include "create.h"
     57 
     58 static void
     59 update_ids(struct memory_file *file)
     60 {
     61 	if (file->owner != NULL) {
     62 		uid_t uid;
     63 
     64 		if (uid_from_user(file->owner, &uid) == -1)
     65 			errx(2, "user %s unknown", file->owner);
     66 		file->st.st_uid = uid;
     67 	} else {
     68 		file->owner = xstrdup(user_from_uid(file->st.st_uid, 1));
     69 	}
     70 
     71 	if (file->group != NULL) {
     72 		gid_t gid;
     73 
     74 		if (gid_from_group(file->group, &gid) == -1)
     75 			errx(2, "group %s unknown", file->group);
     76 		file->st.st_gid = gid;
     77 	} else {
     78 		file->group = xstrdup(group_from_gid(file->st.st_gid, 1));
     79 	}
     80 }
     81 
     82 struct memory_file *
     83 make_memory_file(const char *archive_name, void *data, size_t len,
     84     const char *owner, const char *group, mode_t mode)
     85 {
     86 	struct memory_file *file;
     87 
     88 	file = xmalloc(sizeof(*file));
     89 	file->name = archive_name;
     90 	file->owner = (owner != NULL) ? xstrdup(owner) : NULL;
     91 	file->group = (group != NULL) ? xstrdup(group) : NULL;
     92 	file->data = data;
     93 	file->len = len;
     94 
     95 	memset(&file->st, 0, sizeof(file->st));
     96 
     97 	file->st.st_atime = file->st.st_ctime = file->st.st_mtime = time(NULL);
     98 
     99 	file->st.st_nlink = 1;
    100 	file->st.st_size = len;
    101 	file->st.st_mode = mode | S_IFREG;
    102 
    103 	update_ids(file);
    104 
    105 	return file;
    106 }
    107 
    108 struct memory_file *
    109 load_memory_file(const char *disk_name,
    110     const char *archive_name, const char *owner, const char *group,
    111     mode_t mode)
    112 {
    113 	struct memory_file *file;
    114 	int fd;
    115 
    116 	file = xmalloc(sizeof(*file));
    117 	file->name = archive_name;
    118 	file->owner = (owner != NULL) ? xstrdup(owner) : NULL;
    119 	file->group = (group != NULL) ? xstrdup(group) : NULL;
    120 	file->mode = mode;
    121 
    122 	fd = open(disk_name, O_RDONLY);
    123 	if (fd == -1)
    124 		err(2, "cannot open file %s", disk_name);
    125 	if (fstat(fd, &file->st) == -1)
    126 		err(2, "cannot stat file %s", disk_name);
    127 
    128 	update_ids(file);
    129 
    130 	if ((file->st.st_mode & S_IFMT) != S_IFREG)
    131 		errx(1, "meta data file %s is not regular file", disk_name);
    132 	if (file->st.st_size > SSIZE_MAX)
    133 		errx(2, "meta data file too large: %s", disk_name);
    134 	file->data = xmalloc(file->st.st_size);
    135 
    136 	if (read(fd, file->data, file->st.st_size) != file->st.st_size)
    137 		err(2, "cannot read file into memory %s", disk_name);
    138 
    139 	file->len = file->st.st_size;
    140 
    141 	close(fd);
    142 
    143 	return file;
    144 }
    145 
    146 void
    147 free_memory_file(struct memory_file *file)
    148 {
    149 	if (file != NULL) {
    150 		free(__UNCONST(file->owner));
    151 		free(__UNCONST(file->group));
    152 		free(file->data);
    153 		free(file);
    154 	}
    155 }
    156