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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
polypaudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <time.h>
#include <limits.h>
#include <sys/stat.h>
#include <polyp/error.h>
#include <polyp/util.h>
#include <polypcore/core-util.h>
#include <polypcore/log.h>
#include <polypcore/random.h>
#include "authkey.h"
/* Generate a new authorization key, store it in file fd and return it in *data */
static int generate(int fd, void *ret_data, size_t length) {
ssize_t r;
assert(fd >= 0 && ret_data && length);
pa_random(ret_data, length);
lseek(fd, 0, SEEK_SET);
ftruncate(fd, 0);
if ((r = pa_loop_write(fd, ret_data, length)) < 0 || (size_t) r != length) {
pa_log(__FILE__": failed to write cookie file: %s", pa_cstrerror(errno));
return -1;
}
return 0;
}
#ifndef O_BINARY
#define O_BINARY 0
#endif
/* Load an euthorization cookie from file fn and store it in data. If
* the cookie file doesn't exist, create it */
static int load(const char *fn, void *data, size_t length) {
int fd = -1;
int writable = 1;
int unlock = 0, ret = -1;
ssize_t r;
assert(fn && data && length);
if ((fd = open(fn, O_RDWR|O_CREAT|O_BINARY, S_IRUSR|S_IWUSR)) < 0) {
if (errno != EACCES || (fd = open(fn, O_RDONLY|O_BINARY)) < 0) {
pa_log(__FILE__": failed to open cookie file '%s': %s", fn, pa_cstrerror(errno));
goto finish;
} else
writable = 0;
}
unlock = pa_lock_fd(fd, 1) >= 0;
if ((r = pa_loop_read(fd, data, length)) < 0) {
pa_log(__FILE__": failed to read cookie file '%s': %s", fn, pa_cstrerror(errno));
goto finish;
}
if ((size_t) r != length) {
pa_log_debug(__FILE__": got %d bytes from cookie file '%s', expected %d", (int)r, fn, (int)length);
if (!writable) {
pa_log(__FILE__": unable to write cookie to read only file");
goto finish;
}
if (generate(fd, data, length) < 0)
goto finish;
}
ret = 0;
finish:
if (fd >= 0) {
if (unlock)
pa_lock_fd(fd, 0);
close(fd);
}
return ret;
}
/* Load a cookie from a cookie file. If the file doesn't exist, create it. */
int pa_authkey_load(const char *path, void *data, size_t length) {
int ret;
assert(path && data && length);
ret = load(path, data, length);
if (ret < 0)
pa_log(__FILE__": Failed to load authorization key '%s': %s", path,
(ret == -1) ? pa_cstrerror(errno) : "file corrupt");
return ret;
}
/* If the specified file path starts with / return it, otherwise
* return path prepended with home directory */
static const char *normalize_path(const char *fn, char *s, size_t l) {
assert(fn && s && l > 0);
#ifndef OS_IS_WIN32
if (fn[0] != '/') {
#else
if (strlen(fn) < 3 || !isalpha(fn[0]) || fn[1] != ':' || fn[2] != '\\') {
#endif
char homedir[PATH_MAX];
if (!pa_get_home_dir(homedir, sizeof(homedir)))
return NULL;
#ifndef OS_IS_WIN32
snprintf(s, l, "%s/%s", homedir, fn);
#else
snprintf(s, l, "%s\\%s", homedir, fn);
#endif
return s;
}
return fn;
}
/* Load a cookie from a file in the home directory. If the specified
* path starts with /, use it as absolute path instead. */
int pa_authkey_load_auto(const char *fn, void *data, size_t length) {
char path[PATH_MAX];
const char *p;
assert(fn && data && length);
if (!(p = normalize_path(fn, path, sizeof(path))))
return -2;
return pa_authkey_load(p, data, length);
}
/* Store the specified cookie in the speicified cookie file */
int pa_authkey_save(const char *fn, const void *data, size_t length) {
int fd = -1;
int unlock = 0, ret = -1;
ssize_t r;
char path[PATH_MAX];
const char *p;
assert(fn && data && length);
if (!(p = normalize_path(fn, path, sizeof(path))))
return -2;
if ((fd = open(p, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR)) < 0) {
pa_log(__FILE__": failed to open cookie file '%s': %s", fn, pa_cstrerror(errno));
goto finish;
}
unlock = pa_lock_fd(fd, 1) >= 0;
if ((r = pa_loop_write(fd, data, length)) < 0 || (size_t) r != length) {
pa_log(__FILE__": failed to read cookie file '%s': %s", fn, pa_cstrerror(errno));
goto finish;
}
ret = 0;
finish:
if (fd >= 0) {
if (unlock)
pa_lock_fd(fd, 0);
close(fd);
}
return ret;
}
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