1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2006-2008 Marcel Holtmann <marcel@holtmann.org>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <glib.h>
#include "logging.h"
#include "process.h"
static void child_exit(GPid pid, gint status, gpointer data)
{
debug("Child with PID %d exits with status %d", pid, status);
debug("Exit status %d", WEXITSTATUS(status));
}
int create_reader(uid_t uid, const char *pathname,
GIOFunc func, gpointer user_data)
{
pid_t pid;
unsigned char buf[512];
int fd, pfd[2], len, written;
if (pipe(pfd) < 0) {
error("Failed to create new pipe");
return -1;
}
pid = fork();
if (pid < 0) {
error("Failed to fork new process");
close(pfd[0]);
close(pfd[1]);
return -1;
}
if (pid > 0) {
GIOChannel *io;
g_child_watch_add(pid, child_exit, NULL);
close(pfd[1]);
io = g_io_channel_unix_new(pfd[0]);
g_io_channel_set_close_on_unref(io, TRUE);
g_io_add_watch(io, G_IO_IN | G_IO_ERR | G_IO_HUP, func,
user_data);
g_io_channel_unref(io);
return 0;
}
/* Child process */
close(pfd[0]);
if (setuid(uid) < 0) {
error("Failed to switch to UID %d", uid);
close(pfd[1]);
exit(EXIT_FAILURE);
}
fd = open(pathname, O_RDONLY);
if (fd < 0) {
error("Failed to open file %s: %s",
pathname, strerror(errno));
close(pfd[1]);
exit(EXIT_FAILURE);
}
while (1) {
len = read(fd, buf, sizeof(buf));
if (len <= 0) {
debug("Reading failed");
break;
}
written = write(pfd[1], buf, len);
if (written < len) {
debug("Writing failed");
break;
}
}
debug("Reader finished");
close(fd);
close(pfd[1]);
exit(EXIT_SUCCESS);
}
|
